Refrigeration maintenance technology-compressor classification overview and failure analysis

Refrigeration maintenance technology-compressor classification overview and failure analysis The compressor is the core equipment in the refrigeration system. Only by converting electrical energy into mechanical work and compressing the low-temperature and low-pressure gas refrigerant into high-temperature and high-pressure gas can the refrigeration cycle be ensured. 1. Volumetric type: By changing the volume of the working chamber, the quantitative gas inhaled periodically is compressed. 1. Reciprocating piston type: The working volume of the cylinder is changed by the reciprocating motion of the piston. Divided according to external structure: ① Fully enclosed: the cooling capacity is less than 60KW, which is mostly used in air conditioners and small refrigeration equipment. The driving motor and moving parts are enclosed in the same space, with compact structure, good sealing and low noise. But the power is small and it is not easy to maintain. Common brands: Franco-Brazil Taikang, Franco-American Youle, US Copeland, Bristol, Danfoss Denmark, Embraco Italy, Electrolux, Hitachi, Panasonic, Toshiba, Sanyo, Mitsubishi, DAKIN Daikin, Korean LG , China Chunlan, etc. ② Semi-closed: the cooling capacity is 60～600KW, which can be used in various air conditioners and refrigeration equipment. The crankcase body and the motor casing together form a closed space, which has a stable working life and a long cooling capacity. It can be used in a variety of working conditions and can be maintained, but the noise is slightly higher. Divided into single-stage compression type (conventional type, disc valve type, unloading type, communication type) and two-stage compression type. Common brands: Virtue, Copeland, De Bizer, Bock, Grasso, Italy, Fuji Hao, Lai Fukang, Japan Mitsubishi, Hitachi, Sanyo, China Taizhou Xuemei, Dalian Bingshan, Nanjing Wuzhou, etc. ③ Open type The compressor and the motor are connected externally to the two devices respectively. The structure is complicated and heavy, and the work is unstable. 2. Rotary type: the working volume of the cylinder is changed by the rotary motion of the rotary body. According to the internal structure classification: ① Rolling rotor type: cooling capacity 8～12KW, mostly used in small air conditioners and refrigeration equipment. Fully enclosed, compact structure, good sealing, low noise. But the power is small and it is not easy to maintain. Common brands: Japan Mitsubishi, Hitachi, Panasonic, Sanyo, Toshiba, China Qingan, Huangshi Dongbei, etc. ② Scroll type: The cooling capacity is 8～150KW, which can be used in various air conditioners and refrigeration equipment. It is fully enclosed, with simple and compact structure, high working performance, good sealing and low noise. It will be the leading model in the future. Common brands: Virtue, Copeland, Franco-American, Le Hitachi, Panasonic, Daikin, Sanyo, Chunlan, etc. ③ Screw type: The cooling capacity is 100～1200KW, which can be used in large and medium-sized air conditioners and refrigeration equipment. It is semi-closed, compact in structure, high in working performance, large in cooling capacity and can be adjusted steplessly, but the lubricating oil system is more complicated and the noise is higher. Divided into single and twin screw type. Common brands: Derby Zell, Grasso, Fujitsu Italy, Lai Fukang, Duoling, Japan Hitachi, Daikin, Mitsubishi Heavy Industries, Kobelco, Korea, foreign countries, Taiwan Fusheng, Han Bell, China Jialing, Dalian Iceberg, etc. . 2. Centrifugal type: by the action of centrifugal force, the compressed gas is continuously compressed. The cooling capacity is up to 30000KW, which is used in large air conditioners and refrigeration equipment. Stable work, high performance and long life, large cooling capacity, stepless adjustment. Common brands: US TRANE Trane, CARRIER Carrier, YORK York and MCQUAY McQuay, Japan MITSUBISHI Mitsubishi Heavy Industries, HITACHI Hitachi and EBARA, Swiss SULZER, Korean and Chinese manufacturers, etc. Compressor common fault analysis (1)-motor burned out The failure of motor compressor (hereinafter referred to as compressor) can be divided into motor failure and mechanical failure (including crankshaft, connecting rod, piston, valve plate, cylinder head gasket, etc.). Mechanical failures often overload the motor and even block it, which is one of the main causes of motor damage. The damage of the motor is mainly manifested as the destruction (short circuit) and open circuit of the stator winding insulation layer. After the stator winding is damaged, it is difficult to be found in time, which may eventually cause the winding to burn out. After the winding is burned, some phenomena or direct causes that caused the burnout are masked, making post-mortem analysis and cause investigation more difficult. However, the operation of the motor is inseparable from normal power input, reasonable motor load, good heat dissipation and protection of the winding enameled wire insulation. Starting from these aspects, it is not difficult to find that the reasons for the burning of the winding are as follows: (1) abnormal load and blocked rotation; (2) short circuit of the winding caused by metal chips; (3) contactor problems; (4) power supply Phase loss and abnormal voltage; (5) Insufficient cooling; (6) Vacuuming with compressor. In fact, motor damage caused by multiple factors is more common. 1. Abnormal load and stall The motor load includes the load required to compress the gas and the load required to overcome mechanical friction. If the pressure ratio is too large or the pressure difference is too large, the compression process will be more difficult. The increased frictional resistance caused by lubrication failure and the motor stall in extreme cases will greatly increase the motor load. Lubrication failure and increased frictional resistance are the primary causes of abnormal loads. Dilution of the lubricating oil back to the liquid, overheating of the lubricating oil, coking and deterioration of the lubricating oil, and lack of oil will destroy the normal lubrication and cause lubrication failure. Dilute the lubricating oil back to the liquid, which affects the formation of the normal oil film on the friction surface, and even wash away the original oil film, increasing friction and wear. Overheating of the compressor will cause the lubricating oil to dilute or even coke at high temperature, affecting the formation of normal oil film. The oil return of the system is not good, the compressor lacks oil, and naturally cannot maintain normal lubrication. The crankshaft rotates at a high speed and the connecting rod and piston move at a high speed. The friction surface without oil film protection will quickly heat up. Local high temperature makes the lubricating oil evaporate or scorch quickly, making lubrication of this part more difficult. It can cause serious local wear within a few seconds. Lubrication failure, local wear, and greater torque are required to rotate the crankshaft. Air compressor maintenance. Low-power compressors (such as refrigerators, household air-conditioning compressors) often have blocked rotors (motors cannot rotate) after lubrication failure due to low motor torque, and enter "blocked-thermal protection-blocked" dead Cycle, the motor burns out is only a matter of time. The high-power semi-hermetic compressor motor has a large torque, and local wear will not cause stalling. The motor power will increase with load within a certain range, which will cause more serious wear and even cause the cylinder to bite (the piston is stuck in the cylinder) Inside), severe damage such as broken connecting rod. The current at stall (stall current) is about 4-8 times the normal operating current. The moment the motor starts, the peak value of the current can approach or reach the locked rotor current. Since the heat dissipation of the resistor is proportional to the square of the current, the current during start-up and stall will cause the winding to heat up rapidly. Air compressor accessories. Thermal protection can protect the electrode when the rotor is blocked, but generally it will not respond quickly, and it cannot prevent the winding temperature changes caused by frequent startups and so on. Frequent start-ups and abnormal loads make the windings subject to high temperature tests, which will reduce the insulation performance of the enameled wire. In addition, the load required for compressed gas will increase as the compression ratio increases and the pressure difference increases. Therefore, using a high-temperature compressor for low temperature or a low-temperature compressor for high temperature will affect the motor load and heat dissipation, which is not suitable and will shorten the service life of the electrode. After the insulation performance of the winding has deteriorated, if there are other factors (such as metal chips forming a conductive circuit, acid lubricant, etc.), it is easy to cause short circuit and damage. 2. Short circuit caused by metal shavings The metal shavings in the winding are the culprits of short circuit and low ground insulation value. The normal vibration of the compressor during operation and the winding twisted by the electromagnetic force at each start-up will promote the relative movement and friction between the metal shavings interposed between the windings and the winding enameled wire. Sharp metal chips can scratch the insulation of the enameled wire and cause a short circuit.

Recent related posts

Refrigeration maintenance technology-compressor classification overview and failure analysis

01/09/2021

Refrigeration maintenance technology-compressor classification overview and failure analysis

Refrigeration maintenance technology-compressor classification overview and failure analysis The compressor is the core equipment in the refrigeration system. Only by converting electrical energy into mechanical work and compressing the low-temperature a器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔǅ༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧ޢ識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴㥲ᐲ

So much about the classification of refrigeration compressors! Every sentence is useful!

01/09/2021

So much about the classification of refrigeration compressors! Every sentence is useful!

So much about the classification of refrigeration compressors! Every sentence is useful! The compressor is the core equipment in the refrigeration system. Only by converting electrical energy into mechanical work and compressing the low-temperature and l器2䀀ￜ皥䖒皦즠Ʋ㎄ᰙ㲈Ʋ䌁皦ᮔǅ༬皧㎎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧ج識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴㥲ᐲ

After being equipped with a freeze dryer, the air compressor still contains water. What is the problem

01/09/2021

After being equipped with a freeze dryer, the air compressor still contains water. What is the problem

After being equipped with a freeze dryer, the air compressor still contains water. What is the problem In the post-processing equipment of the screw air compressor, there are a gas storage tank, a freeze dryer and a precision filter. Dry air compressors 器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔǅ༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠Ʋبǜ

Common failures and maintenance methods of industrial dehumidifiers

01/09/2021

Common failures and maintenance methods of industrial dehumidifiers

What are the common failures of industrial dehumidifiers? How do industrial dehumidifiers repair these faults? Or as a technician, you usually deal with these common faults. This article will talk to you about the common faults and maintenance methods of 器2䀀ￜ皥䖒皦즠Ʋ㎄ᰙ㲈Ʋ䌁皦ᮔǅ༬皧㎎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧׮識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴㥲ᐲ

Be sure to understand these before installing a new fan

01/09/2021

Be sure to understand these before installing a new fan

The most troublesome thing: the new fan requires indoor and outdoor air exchange, which requires opening holes on the wall or glass. The diameter of the holes in the market is basically concentrated on 150mm\120mm\110mm\100mm.

Fresh air system energy saving and sustainable development are the key

01/09/2021

Fresh air system energy saving and sustainable development are the key

With the intensification of environmental pollution, the state vigorously promotes low-carbon energy-saving and environmentally friendly life, and according to the national plan, building energy-saving standards will be issued during the "13th Five-Year P器2䀀ￜ皥䖒皦즠Ʋ㎄ᰙ㲈Ʋ䌁皦ᮔǅ༬皧㎎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧ࠤ識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴㥲ᐲ琉蒠S識器直

The relationship between the start of the compressor with liquid and the migration of refrigerant and the solution

01/08/2021

The relationship between the start of the compressor with liquid and the migration of refrigerant and the solution

The relationship between the start of the compressor with liquid and the migration of refrigerant and the solution One, start with liquid First, let's define what is called liquid start. When the refrigeration unit is in the shutdown state, there is ref器2䀀ￜ皥䖒皦즠Ʋ奌ི㲈Ʋ䌁皦ᮔǅ༬皧奖ིЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧Ҡ識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴

REFRIGERATION COMPRESSOR TYPES: WHICH IS THE BEST SOLUTION?

01/08/2021

REFRIGERATION COMPRESSOR TYPES: WHICH IS THE BEST SOLUTION?

By ARANER Posted In Refrigeration, Our Most Popular Post With the increasing need for refrigeration, compressors are being developed in numbers and with better technology. However, the basics still stand. With the many refrigeration compressor types a器2䀀ￜ皥䖒皦즠Ʋ㎄ᰙ㲈Ʋ䌁皦ᮔǅ༬皧㎎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧୎識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴㥲ᐲ琉蒠S識器直囬ᐱ囸ᐱ嵭僦㠦ᐲᔇ僦囸ᐱ殺廼僦囬ᐱᙐ僦㠲ᐲ嵥僦直ᙧ僦㠲ᐲ令ᙐ僦㣮ᐲ嵭僦林ᙧ僦㣮ᐲ龍톺珵㥲ᐲ枬 퀖珵林춌珵蓄Cᴨ먢塚赺C直ᵘ먢塚㥲ᐲ礼藚C識直杴器器蘯C礼器垘ᒣ識靖ﮰ﨤虣C器﯈擜 ﮰ直杴梅擩 ﯈祖斥 ﯈ﯤ未 ﯈ꍀᒥ⺠ᅗ䠠 뤂ᐱ ᧪ᐲ 뤂ᐱ 㥲ᐲ 뤂ᐱ ᧪ᐲ 뤂ᐱ ᧪ᐲ 㗚ᐲ嫜ི⹤ᅗ 뤂ᐱ曐ᅤﱄﱈ㕐ϵĂぬᒢﱐὣ¢ﰸﱄﯰ⁝¢ﱐﯼ⃶¢ﱐﱘ↯¢ﱐꍀᒥﺨᾃരΞ뮼ᒣ࿢΄

IMPACT OF CORONA ON REFRIGERATION COMPRESSOR MARKET 2020 GLOBAL INDUSTRY SIZE, FUTURE GROWTH BY 2026 INFICON, ROBINAIR, TESTO

01/08/2021

IMPACT OF CORONA ON REFRIGERATION COMPRESSOR MARKET 2020 GLOBAL INDUSTRY SIZE, FUTURE GROWTH BY 2026 INFICON, ROBINAIR, TESTO

REFRIGERATION COMPRESSOR MARKET, REFRIGERATION COMPRESSOR MARKET ANALYSIS, REFRIGERATION COMPRESSOR MARKET GROWTH, REFRIGERATION COMPRESSOR MARKET TREND

How Does A Refrigerator Work?

01/08/2021

How Does A Refrigerator Work?

To put it simply there are 3 steps by which a refrigerator or a fridge works: 1.Cool refrigerant is passed around food items kept inside the fridge. 2.Refrigerant absorbs heat from the food items. 3.Refrigerant transfers the absorbed heat to the relati器2䀀ￜ皥䖒皦즠Ʋ㎄ᰙ㲈Ʋ䌁皦ᮔǅ༬皧㎎ᰙЀ呄ᠾ鹨់༹皧ࠄ00령ꐱ댁珵뛐珵Љ䕄ྦ뤂ᐱ뚜珵ᴴᏩ呄ᠾ퍘ᒥ鹨់ᩄꋔྦ瑉浥巠皱㙲皦抐皱巠皱੨皦柘皱ￜ皥ب巠皱㙲皦忈皱੨皦柘皱즠Ʋǜ勁皦즠ƲبǜV /펔B䌁皦 ᮔǅ'鱤ǆၜ먢䇨珵呈ᠾ뤂ᐱ⿇⬿먲僧ᐱ㥲ᐲ�僬㣢ᐲᠾ랖僧܈識�僬㣢ᐲ臆S㥲ᐲᬄğ識理艏S杴識杴㥲ᐲ

Submitted Successfully

Submission Failed

Chat

Welcome to O&Kmarts

Is there anything we can help?

Chat online
Email us
Feedback

© eCommerce. 2017-2024. All Rights Reserved

Press and drag the mouse to start taking a screenshot