CN2420473Y

CN2420473Y - Automatic detector for four-way change-over valve of air conditioner

Info

Publication number: CN2420473Y
Application number: CN 99240423
Authority: CN
Inventors: 翁文兵; 付行军; 陈剑波; 吴兆林
Original assignee: University of Shanghai for Science and Technology
Current assignee: University of Shanghai for Science and Technology
Priority date: 1999-11-23
Filing date: 1999-11-23
Publication date: 2001-02-21
Anticipated expiration: 2009-11-23

Abstract

The utility model relates to an automatic detector for a four-way change valve of an air conditioner. An air-actuated clamp is butted with a four-way change valve of an air conditioner. Four connecting pipes of each change valve are connected with four detecting main pipes in parallel through four electromagnetic valves. A programmable controller is connected with a corresponding electromagnetic valve set on a station for changing the electromagnetic valve set to orderly detect the four change valve. The utility model is used for the detection of the matched change valves. The utility model can raise the detection efficiency on probation, the detecting result is reliable, and the labor intensity of the detecting persons is greatly reduced.

Description

Air conditioner four-way change-over valve automatic testing equipment

The utility model relates to a kind of air conditioner four-way change-over valve automatic testing equipment.

Four-way change-over valve is a critical piece of realizing refrigeration and the conversion of heat pump heat-production functions in the air conditioner.Four-way change-over valve is made up of main valve and pilot valve two-part, as shown in Figure 1, connects with capillary tube between pilot valve and the main valve, and pilot valve is actually a four way solenoid valve, and is small-sized; Main valve is made up of valve body and slide block, four interfaces of pilot valve by capillary tube respectively with the high-voltage tube of main valve, low-voltage tube and valve body two ends air chamber link to each other, after the energising of the solenoid valve on the pilot valve, the pilot valve valve body is shifted to right-hand member, capillary tube b and d are connected, a and c connect, like this, the left end of main valve links to each other with high pressure, right-hand member links to each other with low pressure, the main valve slide block is shifted to left end, the B pipe of main valve is linked to each other with low-voltage tube S, the A pipe links to each other with high-voltage tube D, equally, pilot valve slide block after pilot valve solenoid valve dead electricity is because left end is shifted in the effect of spring, capillary tube c is linked to each other with low pressure, d links to each other with high pressure, thereby the main valve piece is moved to the left, and the A pipe is linked to each other with low-voltage tube S, B links to each other with high-voltage tube D, realize the commutation of flow of refrigerant, this principle of four-way change-over valve has determined it to must operate in certain pressure differential range, and the active force on the slide block is enough big, the promotion slide block moves, make and commutate successfully, owing to seal difficulty between slide block and the valve body, this has inevitably caused the leakage between the high low pressure in addition, must check its commutation capacity under high low pressure when therefore checking four-way change-over valve, and internal leakage.Therefore, the main content measurement of four-way change-over valve has: minimum commutation pressure test, maximum commutation pressure test; The internal leakage test.Yet at present, selector valve factory and air conditioner MANUFACTURER adopt manual method to detect four-way change-over valve, and automaticity is low, and labor intensity is big, inefficiency, and poor reliability becomes the weak link of an a surname in the air supply rate check.

The purpose of this utility model is low in order to overcome the existing automaticity that adopts manual method detection four-way to change valve, labor intensity is big, inefficient shortcoming provides a kind of employing pneumatic fixture, by the air conditioner four-way change-over valve automatic testing equipment of control device control able to programme.

The technical solution of the utility model is that (number of patent application is: 99240405.3) dock with the air conditioner four-way change-over valve by a pneumatic fixture, four adapters of each selector valve are parallel to four test house stewards by four solenoid valves, corresponding electromagnetic valve group is connected on programmable controller and the station, be used for the switching solenoid valve group, test four selector valves successively, the high-pressure air source air inlet is reduced pressure respectively by four reduction valve, for high pressure commutation test, internal leakage is measured, pneumatic fixture and low pressure commutation test, switch to high-pressure main through four solenoid valves again, measure in internal leakage, installed one-way valve additional on the air supply pipe of pneumatic fixture and low pressure commutation test, two selector valve action subsidiary conduits are connected to pressure switch respectively, low-pressure manifold is by the directly logical atmosphere of a valve, the high low pressure house steward is provided with bypass valve, and low-pressure manifold connects a flowmeter by a switching valve.

The utility model adopts such scheme, and efficient improves more than 4 times after testing, and inspector's labor intensity greatly reduces, and has stopped tired omission and the false retrieval phenomenon that causes because of the inspector.

The utility model is implemented to be described further in conjunction with the accompanying drawings,

Fig. 1 is the four-way change-over valve structure principle chart;

Fig. 2 is the utility model catenation principle figure;

Fig. 3 is the utility model connecting circuit figure.

The automatic testing equipment of present embodiment has four test station, be divided into two groups, be provided with water tank below every group, be used for detecting the tightness of selector valve, in order to alleviate tester's labor intensity, designed a cover pneumatic fixture, with the selector valve automatic butt, as shown in Figure 2, to be parallel to four test house stewards by four solenoid valves be Ld, Ls, La and Lb for four of each selector valve adapters.A valve group is arranged on each station, and they are respectively V13～V16, V17～V20, and V21～V24, V25～V28 by the switching of corresponding electromagnetic valve group on the station, tests four selector valves successively.Device is decompressed to 0.25MPa, 1.0MPa, 2.5MPa and 3.0MPa by unified high-pressure air source Q air inlet respectively by four reduction valve V1～V4, switches to high-pressure main Ld through four solenoid valve V5～V8 again.In order to prevent the refluence of different pressures gas, installed one-way valve V9～V11 additional on 0.25MPa, 1.0Mpa and the 2.5MPa air supply pipe.Whether La and Lb two pipes meet pressure switch Pa, Pb respectively, correct in order to judge commutation.When test selector valve internal leakage, low-pressure manifold Ls connects flowmeter by switching valve V29, logical again atmosphere; When testing the high low pressure commutation capacity of selector valve, Ls is by the directly logical atmosphere of V29.V12 is the high-pressure main bypass valve, and when testing the tightness of selector valve, V29, V30 close, V12 opens, and opens V5 this moment, can load the air pressure of 3.0MPa simultaneously on selector valve, rise the water tank under the selector valve simultaneously, selector valve all is immersed in the water, have or not bubble to generate in the observation water.This device adopts programmable controller (PLC) control automatically.As control centre, after the test beginning, at first open the solenoid valve valve group on first selector valve, open V8 and V30 then, PLC controls the break-make of tested selector valve electromagnetic coil, and can measure a tangible variation in pressure this moment on pressure controller.Because under normal circumstances

The A of selector valve, B two always takes over one and connects high pressure, and another connects low pressure, so, the invariably accompany switching of two pressure controller closed states of the normal switching of selector valve.Can judge whether correctly commutation of selector valve by the state of gathering two pressure controllers.After low voltage experiment finished, V8 closed, and V6 opens, the similar test of carrying out the high pressure commutation.At last, close V6, V30, open the test that V7, V29 carry out the selector valve leakage rate.Behind the internal leakage EOT of first valve, close the valve group of first selector valve, open second selector valve solenoid valve valve group of connection, carry out the test of second selector valve.Behind two selector valve EOTs, the water tank below the valve rises automatically, and two selector valves are immersed in the water, carries out the selector valve air tightness test.Set time arrives, and water tank resets, and behind first group of two selector valve EOT, begins to test second group of selector valve.In one group of selector valve test, can load and unload another group, thereby improve testing efficiency greatly.Fig. 3 is the electrical connection diagram of programmable controller and four station means for air conditioner four-way change-over valves, and its corresponding electromagnetic valve group with each is connected, and is used for the switching solenoid valve group, tests four selector valves successively.

Claims

1, a kind of air conditioner four-way change-over valve automatic testing equipment, it is characterized in that, it is docked with the air conditioner four-way change-over valve by a pneumatic fixture, four adapters of each selector valve are parallel to four test house stewards by four solenoid valves, corresponding electromagnetic valve group is connected on programmable controller and the station, be used for the switching solenoid valve group, test four selector valves successively, high-pressure air source Q air inlet is reduced pressure respectively by four reduction valve V1～V4, for high pressure commutation test, internal leakage is measured, pneumatic fixture and low pressure commutation test, switch to high-pressure main Ld through four solenoid valve V5～V8 again, measure in internal leakage, installed one-way valve V9～V11 additional on the air supply pipe of pneumatic fixture and low pressure commutation test, selector valve action subsidiary conduit La and Lb two pipes are connected to pressure switch Pa respectively, Pb, low-pressure manifold Ls is by the directly logical atmosphere of valve V30, V12 is high low pressure house steward's a bypass valve, and low-pressure manifold Ls meets flowmeter FM by switching valve V29.