How to deal with transformer cooling system fault

For forced oil circulation air-cooled, water-cooled and water-cooled transformers, when the cooling system (fan, submersible oil pump, cooling water system, etc.) fails and the cooling device is stopped, the following treatment shall be carried out:
(1) In case of optical word signals of "failure of working power of cooling device" or "failure of standby Power" on the transformer control panel, the cause shall be immediately found out and the cooling device shall resume working as soon as possible.
(2) When the optical word signal "cooling water interruption" appears on the transformer control panel, the cause shall be promptly checked and the cooling device shall resume working.
(3) If the above two fault signals occur at the same time, attention should be paid to the change of oil on the transformer upper layer and oil level of the oil pillow. When the cooling device is out of service, the oil temperature will rise sharply and the oil may escape from the explosion-proof tube (or safety airway). When the cooling device resumes operation and the oil level of the oil pillow drops sharply again, and the oil level drops below -20℃ and continues to decline, the heavy gas protection device should be stopped immediately. If the cooling unit cannot be resumed within the specified time, the duty shall be reported long and the transformer withdrawn from operation.
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Basic knowledge of wind turbine

Classification of fans:
a) Forward tilt (single suction, double suction, applicable pressure below 1000Pa)
b) Backward tilt (single piece, wing section, single suction, double suction, applicable pressure above 1000Pa)
c) Axial flow (iron fan blade, spiral pulp type)
d) Oblique flow and mixed flow
Fans can be divided into:
Boiler, cooling, explosion-proof, anti-corrosion, ship, textile, tunnel, dust exhaust, general industrial ventilation, air conditioning fan, etc.
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Heating source type in heat treatment industry of technical analysis

In recent 20 years, the domestic development and introduction of non-oxidizing heating furnace with advanced level, such as vacuum furnace, protective atmosphere furnace, controllable atmosphere furnace, ion nitride furnace and so on account of less than 20%, however, these advanced heating equipment due to management and operator quality is not high, did not give full play to the equipment due to the role.
Therefore, the technical transformation of heat treatment furnace is imperative. To promote new technology, develop new technology materials, training workers to improve the quality of the industry staff. The renovation of heat treatment process equipment is also quite heavy. It is equally important to renovate the traditional old heating equipment in service while promoting the use of new vacuum heating equipment and protective and controllable atmosphere heating equipment. Choosing practical and feasible schemes and technological transformation measures and spreading them can create considerable wealth for enterprises and the country.
Natural gas is the best energy. Rational choice of energy is the primary problem to be considered in energy saving of heat treatment equipment. Generally, heat treatment energy can be divided into electricity and fuel. The use of electricity or fuel, and the type of fuel used, depends on a combination of factors such as production costs, energy availability, ease of operation and control, reliability, the nature of the heat treatment process and its impact on the ecological environment.
Electric heating is clean, the temperature is easy to control, less auxiliary facilities, simple operation is its advantages. In theory, 70%~80% heat utilization rate can be obtained by heating with resistance furnace, but electricity is secondary energy. Considering the efficiency of generation, the comprehensive heat utilization rate of resistance furnace does not exceed 30%. The price of electricity is high, and so is the cost of production. Due to the development of science and technology and the increase of the proportion of hydropower and nuclear power, the price of electric energy in the world tends to decrease relatively. Therefore, the current trend in the world is still to increase the proportion of electric energy.
Fuel is cheaper than electricity, but its combustion process is more complicated, and fuel causes more environmental pollution than electricity. However, with the development of control technology, it is possible to control the temperature of gas and liquid fuel furnace accurately.
Natural gas is primary energy, heat treatment furnace in addition to direct combustion can obtain at least 30% of the thermal efficiency, flue gas waste heat can also be used to preheat combustion, with air, furnace heating, cleaning fluid and quenching oil heating and other domestic purposes, so that the absolute heat utilization rate can reach more than 80%. At present, advanced industrial countries have a considerable proportion of heat treatment fuel furnace.
According to the investigation, the proportion of fuel furnace used for heat treatment in Western European countries is 20%~30%, and 25.5% in The United States, while the fuel furnace in Japan mainly USES heavy oil, kerosene, liquefied gas and city gas, accounting for 61.4% in total.
In recent 10 years, there has been a great breakthrough in the exploration of natural gas in China. It will create very convenient gas conditions for heat treatment industry. The majority of enterprises should see this favorable prospect of heat treatment energy change and fully consider and utilize it in the technological transformation of heat treatment production and the updating of equipment.
Enterprises usually choose the furnace from process requirements, workpiece shape and size, and production batch. From the point of view of heat treatment energy utilization, the efficiency, sealing and shape of the furnace should be considered. When the workpiece batch, single variety, should use continuous furnace. Under the same furnace volume, the round (column) furnace is more energy-saving than the square furnace.
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Key points of tube electric furnace testing

In the use process of energy-saving tubular electric furnace, what tests should be carried out for energy-saving tubular electric furnace? What is the focus of the test? Today, let's talk about these issues!
First of all, before operation and use, we should check carefully whether the parts or screws of the energy-saving tubular electric furnace are fixed, whether the power supply of the equipment can be started normally, and whether there is short circuit or disconnection, which should be checked.
Secondly, check whether the door lifting and in and out operation of the energy-saving tubular electric furnace are normal. Although it is used in the high temperature working environment, the energy-saving tubular electric furnace also has a fixed high temperature standard, so it must not exceed this temperature, which will shorten its service life.
Moreover, if there is explosive gas or volatile gas, it must not be allowed to enter the energy-saving tubular electric furnace, which is not only to protect the safety of equipment, but also to protect the safety of operators.
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Main components of nitrogen making high pressure air compressor unit

When the driver drives the compressor through V-belt, the free state air is drawn into the first stage cylinder (I) through the intake filter, compressed to a certain pressure, and then discharged into the first and second stage intercoolers and separators (3) after the separation of cooling oil and gas, and then into the second stage cylinder (II), further compressed to a higher pressure, and then discharged into the second and third stage intercooler coolers (4) and separators (5) for the compressed air Oil and condensate are cooled and filtered.
Then enter the third stage cylinder (III) to compress to the final required pressure, and then enter the separator (7) to filter the purifier (8), further remove the oil, condensate and oil vapor in the compressed air of the nitrogen generator, to obtain the cooled, clean and tasteless high-pressure air, and inject the qualified high-pressure cylinder which can be separated and filtered from the separator behind the cylinders at all levels.
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Soldering machine for multi head copper pipe joint of water heating sanitary ware

Product description
The traditional brazing of water heating sanitary ware adopts flame (oxyacetylene) heating. The unit heating cost is too high, and the working environment is bad, the operation is complex, and a large number of wastes are produced in the long-term work, resulting in many disadvantages such as environmental pollution and insecurity.
Our company is specially designed for brazing copper, aluminum copper, aluminum aluminum, stainless steel copper, steel steel, steel copper and other different or same materials.
The high frequency induction heating brazing machine developed by our company for the plumbing industry has the characteristics of high efficiency and fast heating, high quality and low price, safety and reliability, long service life, simple operation, energy saving and environmental protection. The high-tech products produced by strict process have won high praise among new and old customers.
Technical parameters:
1. Work positioning 12 stations, two stations synchronous welding;
2. IGBT transistor high frequency power supply 2x25kw, working frequency 25 ± 5KHz;
3. Input voltage 380V, frequency 50 (60) Hz;
4. Water cooling system: water pressure 2-3kgf / cm2, input water temperature < 30 ℃, water flow 30L / min;
5. Automatic switch to two-stage heating mode;
6. Operation mode: automatic program control / manual control;
7. Overall dimension: 1875x1680x1680.
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Screw compressor working principle

The interchangeability of Leeb hardness tester is reflected in

Generally speaking, the Leeb hardness tester that conforms to the national and international standards has the interchangeability consistency. What are the main aspects of this interchangeability?
The impact device and punch of the impact device of the Leeb hardness tester are interchangeable. For example, seven different types of impact devices can be configured on one host of the Leeb hardness tester, that is to say, the same type of impact device can be configured on the same host. The replaceability of the punch of the impact device of the Leeb hardness tester means that the same punch can be replaced without affecting the measured value.
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Trouble shooting of oil-water separator

Trouble shooting of oil-water separator
Oil and water separator failure - white smoke from the engine.
A damaged oil-water separator can cause the engine to emit white smoke, as the water in the fuel turns to steam when burned.
And the steam in the white smoke will damage the high-pressure fuel injector, resulting in insufficient engine power, will cause a sudden stop phenomenon, serious cases will directly damage the engine.
Fault of oil-water separator -- carbon deposit.
If the oil-water separator is damaged, the water and impurities in diesel fuel will pass through the filtration and cleaning device, and then accumulate in the inlet valve, inlet and cylinder, forming hard carbon accumulation over a long period of time, which will then affect the work of the engine, and seriously lead to engine damage.
Damage of oil-water separator will cause valve carbon accumulation, and valve carbon accumulation will lead to the engine starting difficulty, idle speed instability, poor acceleration, rapid refueling tempering, exhaust gas exceeding the standard, increased fuel consumption and other abnormal phenomena, serious will lead to engine damage.
Iii. Failure of oil-water separator -- engine acceleration instability or inability to accelerate and emission of black smoke.
The high-pressure fuel injection nozzle in the high-pressure common rail system needs accurate control of fuel injection pressure, fuel injection time and fuel injection amount, and the work of the fuel injection nozzle is relatively fine. If problems occur in the oil-water separator, water and impurities in diesel fuel will cause wear and tear to the plunger couple in the fuel injection nozzle, causing tension until the fuel injector is stuck.
Damage to the fuel injector can cause unstable or weak acceleration of the engine, or emit black smoke and other faults, or directly damage the engine. As a result of the nozzle more fine workmanship, so its price is relatively high. Based on the above reasons, when there is a problem with the oil-water separator, it must be replaced in time. Tanaka industry and trade here for you carefully prepared the oil and water separator disassembly wrench.
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Two ways of heating a resistance wire

High temperature resistance wire factory introduces two ways of heating resistance wire:
1. Insert the heating element composed of resistance wire into the mold heating plate;
2. Place the resistance wire directly in the heating plate of the mold.
When designing mold resistance heating, the following basic requirements must be considered:
1. Protective measures of the heating mold should be considered to reduce heat conduction and heat radiation loss. Generally, asbestos insulation board is set between the mold and the upper and lower pressing plate of the injection machine, as well as around the mold. The thickness is about 4-6mm;
2. Different power heating elements are used in the central and edge parts of the heating plate respectively. Generally, the power of the heating elements in the central part of the mold is slightly lower, while the power of the heating elements in the edge part is slightly higher.
3. Two sets of temperature instruments should be installed on the electric heating plate of large molds to control and adjust the temperature of the central and edge of the electric heating plate respectively;
These are the two ways of heating a resistance wire.
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How to supply high temperature resistance belts in large quantities

Many industries require wholesale purchase of high-temperature resistance bands, which can ensure that the subsequent processing is not affected, and also ensure the thermal stability and precision of resistors. But since you're buying in bulk, you should definitely do a good job measuring the whole thing so that we know which products meet our needs. If you want to buy in bulk, how do you buy in bulk?
Contact manufacturers are more secure
We need different types of high-temperature resistance belts. Since we need wholesale purchase, we must contact the manufacturer. Only direct selling by the manufacturer can provide me with better service, and the price of direct selling by the manufacturer will be more favorable. The proposal still should contact on large manufacturer, so the other side supplies product type to be complete, the quantity buys the price respect also to be able to be more favourable some.
Note the sample comparison
If we want to cooperate with the manufacturer, it is also necessary for them to provide corresponding samples. In this way, we can at least see the quality of constantan belt. As long as the quality of the products can be determined and the samples meet our requirements for the products, then the subsequent direct bulk purchase can naturally ensure that the use will not be affected by any.
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Correct selection of armored thermocouple

The value of temperature can be accurately obtained by correctly selecting armored thermocouple
The correct use of armored thermocouples can not only accurately obtain the temperature value and ensure the quality of products, but also save the material consumption of armored thermocouples, which can not only save money but also ensure the quality of products. Incorrect installation, thermal conductivity and time lag are the main errors of armored thermocouple in use.
For example, the installation position and insertion depth of armored thermocouple cannot reflect the real temperature of furnace, in other words, armored thermocouple shall not be installed too close to the door and heating place, and the insertion depth shall be at least 8-10 times of the diameter of protective tube; The gap between the protective sleeve and the wall of the armored thermocouple is not filled with insulation material, which causes the hot overflow or cold air invasion in the furnace. Therefore, the gap between the protective tube of the armored thermocouple and the hole of the furnace wall shall be blocked with insulation material such as fire-resistant mud or asbestos rope to prevent the cold and hot air convection from affecting the accuracy of temperature measurement.
The cold end of armored thermocouple is too close to the furnace body to make the temperature exceed 100 ℃; the installation of armored thermocouple should avoid strong magnetic field and strong electric field as much as possible, so armored thermocouple and power cable should not be installed in the same conduit to avoid interference and error; Armored thermocouples can not be installed in the area where the measured medium has little flow. When using armored thermocouples to measure the gas temperature in the tube, the armored thermocouples must be installed against the flow direction and fully contacted with the gas.
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Refrigerated vehicle transport temperature recorder W100

The product description
Refrigerated vehicle transport temperature recorder Product features:
1. Stable USB communication interface
2. Shorten the interval first second
3, button batteries can be bought anywhere, easy to replace
4. Innovative and convenient software functions, automatic connection and automatic download (national copyright)
Application of temperature recorder in refrigerated vehicles:
Refrigerated truck, transport truck | vegetables, fruits, frozen/milk dairy products, vaccine drugs, sensitive electronic materials, blood products, wood furniture, etc
Refrigerated vehicle transport temperature recorder Product description:
Refrigerated vehicle transport temperature recorder model: W100
◆ Measurement range: -40℃ ~ 85℃
◆ Precision: ±0.5℃ (the whole process)
◆ Record capacity: 16,384 sets
◆ Record interval: adjustable from 1 second to 24 hours continuously
◆ Communication interface: USB interface
◆ Software: Chinese and English versions
◆ Size: 88×48×22 mm
◆ Support system: Windows @98/2000 / XP / 2003 / Vista
Product Features:
1. This product has the characteristics of small size, beautiful appearance, USB interface, reliable performance, affordable price, good water resistance, convenient battery replacement, recyclable use and so on.
2. Main functions: It can automatically track and record the temperature changes of refrigerated vehicles, containers, refrigerated warehouses, storage and transportation of vegetables and fruits in refrigerators, frozen/milk dairy products, vaccines and drugs, sensitive electronic materials, blood products, etc.
3. USB communication interface is adopted: data export is convenient, and can be directly connected to and exported with a laptop. There is no need to analyze data on the desktop in the office; Automatic connection, automatic download and save data, more convenient operation.
4. Long storage time: for example, data can be recorded once in 15 minutes, and records can be stored for up to 5.7 months.
5, the whole machine is small power consumption, using built-in button lithium battery power, record interval set more than 10 seconds, the battery life of more than one year (room temperature environment), three months (cold storage environment). It is easy to replace the battery and can be bought in any supermarket in the world.
6. Data logger software (with national copyright Registration Certificate) :
(1) Simple interface, easy to use, easy to operate, no need for professional training; Temperature data and process curve trend can be easily displayed for better clarity and clarity.
(2) The data stored in records can be backed up and saved in database files, TXT, WORD, EXCEL and other OFFICE formats to facilitate subsequent calls.
(3) The temperature data report and graph can be checked at selected time periods and printed out by computer.
(4) There are bilingual versions of the software in Chinese and English. The operating language of the software can be switched by itself, and there is no need to install multiple versions; The English version has international universality.
(5) The graph is in line with international standards, and has the function of setting out-of-limit area coloring, which makes the display more intuitive and brings more convenience to customers.
(6) The curve coordinates can be set and moved by themselves, which makes the analysis of historical trend and time clearer.
(7) Fully compatible with all 32-bit Windows systems on the market, including the new Vista.
7. The recorded temperature data cannot be modified, which can provide strong investigation evidence and claim evidence when there are problems in food and medicine inspection, transportation and other aspects.
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Heat Treatment Vacuum Furnace

Induction hardening process for wheel support

Induction heat treatment is characterized by its ability to finish the surface quenching of the workpiece in a very short time. In the past 30 years, induction heat treatment has developed rapidly and been widely used in automobile manufacturing industry. According to the technical requirements of heat treatment of wheels, two technological schemes are drawn up:
Scheme 1 is integral heating;
Scheme 2 is the trial production of two sets of sensors by scanning heating.
(1) The end of the workpiece is not hardened after the integral heating quenching.
(2) The depth and hardness of the hardening layer of the scanned quenched workpiece need to increase power and adjust the size of the inductor; All the angles meet the requirements, but the productivity is low, and the heat in the soft part is not easy to penetrate into people, and the heating depth is easy to be shallow, but the productivity is high, which affects the fatigue life of the product. When the wheel bracket is heated, the hardened part is finished once, which is not easy to form soft belt and has high productivity. The use of quenching waste heat for self-tempering is simple, but the sensor structure is complex, the process is inconvenient to adjust, and the sensor life is not stable. The fatigue strength of the parts has obvious correspondence with its surface stress, that is, the compressive stress is large, the fatigue strength and fatigue life are increased. As the specific volume of martensite increases in the quenching layer, the residual compressive stress can be formed for the parts with surface quenched by induction heating.
Medium frequency heating furnace, using imported power devices, digital control technology, small size, light weight, easy to install, energy-saving environmental protection, automatic control and protection, super safety, all kinds.
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Requirements for vacuum sintering furnace in vacuum heat treatment furnace

1. Vacuum sintering furnace needs to have air tightness in structure and function, that is, it can isolate the air outside the furnace and ensure the protection atmosphere inside the furnace unimpeded.
2. Vacuum sintering furnace should be equipped with perfect dewaxing device or dewaxing belt in terms of structure and function.
3. The temperature of each section in the sintering furnace is controllable and the atmosphere of each section is adjustable.
4. For continuous sintering furnace, it has transmission device and transmission speed can be adjusted.
5. With fast cooling device, the sintered parts can be cooled quickly to the temperature of coming out of the oven.
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Oil filter has made new achievements in decolorization technology

In the research and development of oil filter, the oil filter used to filter the mechanical impurities and moisture of oil products has become a widely known technology. However, the decolorization of oil filter to make it closer to or even fully match the quality of the new oil is still a topic that many researchers keep exploring.
After continuous theoretical exploration and experimental operation, the company finally developed a new type of oil filter, which not only has the traditional function of removing impurities, moisture and harmful gases, but also has high-performance decolorization function.
After practical application, this decolorizing oil filter has the most obvious filtering effect and higher filtering accuracy. In line with modern industrial equipment for high precision oil demand.
How does an oil filter achieve this filtering effect? The engineer made the following introduction:
A. Operating principle of the oil filter: vacuum decompression, film atomization, three-dimensional flash evaporation, dehydration and emulsification breaking and micro-filter purification technology; the whole machine has no filter element, no filter plate and pure physical decolorization and odor removal;
B. Oil filter's action object: anti-wear hydraulic oil (black, red, white, etc.), mechanical oil (12#, 16#, 32#), light oil (diesel, kerosene, etc.) and other lubricants;
C. Vacuum separation system of oil filter: vacuum separation technology from Italy has been introduced, which is composed of atomizer, reactor, separation chamber, accumulator oil tank, exhaust chamber, foam eliminator, observation window and liquid level device.
(1) atomizer: atomize the oil into the vacuum separation system and spray it onto the reactor;
(2) reactor: composed of multiple rashig rings, let the oil mist sprayed on the reactor to form an oil film, so that the water in the oil, gas as far as possible to volatilize, greatly improve the efficiency of dehydration and degassing;
The separation chamber: located between the reactor and the fuel tank, the oil is separated again from the water, gas and oil when the oil runs in this section;
And gather the tank; Will separate the water, gas oil accumulation, by the exhaust pump discharge;
Extraction chamber: the water vapor and residual gas separated from the reactor and separation chamber are extracted from the vacuum separation system. Avoid redissolving water and gas in oil;
• antifoaming device: the use of Japanese omron device; Automatic elimination of oil bubbles in the oil, replace manual defoaming, so as to achieve online operation unattended;
Observation window: use toughened glass as observation mirror, replace plexiglass as observation mirror when the defect of depression deformation under high temperature and high vacuum conditions;
Realization of automatic level control device: being configured in and out of the oil automatic balance adjustment, constant oil filtration system to achieve the purpose of man-machine separation, and set up a high level and low level protection system;
'levies adopt complex three-dimensional flash evaporation system, thereby increasing the evaporation area and prolong the cleansing oil in vacuum separation system of evaporation time, greatly improve the dehydration (free water, micro water) degassing efficiency;
D. special filtration system of oil filter:
Under the action of interfacial tension friction, the oil produces a certain amount of metal iron foam, which cannot be solved by filtering (too much iron foam leads to frequent blocking of magnetic filter element). This system can absorb various sizes of iron foam, the capacity of pollution is the general magnetic filter 30 ~ 50 times. Electrostatic degaussing can effectively filter the gum, asphaltene and carbon residue of aging oil products (a major obstacle that cannot be solved by ordinary oil filters), which greatly improves the cleanliness of oil products.
E. The oil filter is equipped with an automatic backwashing system:
With back flush fast, clean, completely, especially for some special oil cleaning complex, must remove to cleaning process, as well as the groove part of the equipment cleaning, from the design of the device itself and pipe connection, on the basis of fully out of the past artificial problem caused by a variety of cleaning, give full consideration to the customers in the use of equipment in the process of encounter various difficulties.
F. Pure physical decolorization system of oil filter:
It is equipped with rotatable uniform heat mixing system (the key technology of decolorization) to absorb and remove impurities such as melanin which cannot be filtered
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