Compressor starting capability identification device

Abstract

The utility model discloses a compressor starting capacity recognition device. A compressor (4) is communicated with an air suction pipe electromagnetic valve (1) through an air suction pipe (9), communicated with a pressure tank (7) through an exhaust pipe (8) and connected with a refrigerant tank (12) through a refrigerant pipe (10). And an electric contact pressure gauge (6) is arranged on the pressure tank (7) and is connected with the electric appliance control unit (5) through a circuit. By the adoption of the technical scheme, the starting capacity of the compressor can be accurately judged, and the device is simple and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of compressor starting ability detection, in particular to a compressor starting ability identification device. Background Art

[0002] At present, during the production process and even on the market, reciprocating piston compressors are generally started directly at low pressure without adding load during indoor final inspection due to their large output and high production efficiency. However, after the compressors are put on the market and delivered to customers, the sizes of the two devices in the customer's refrigeration system, the length of the capillary throttling device, and the layout of the pipelines are not completely consistent. Therefore, the compressors often fail to start or have no displacement as determined by the customers, resulting in the compressors being returned to the manufacturer.

[0003] When the manufacturer re-tested these products, the compressor was able to start by connecting the displacement meter to power, and the compressor was connected to a calorimeter for cold and hot start tests. It was found that most compressors were no different from normal machines; some compressors did have abnormal starting performance.

[0004] It can be seen that due to the fact that the compressor is not overloaded and the differences in customer systems, customers often misjudge that the compressor is faulty and judge a normal machine as a faulty machine. At the same time, the process of confirming the faulty machine requires testing on the calorimeter system, which has a long test cycle and a complicated process, affecting work efficiency.

[0005] The problems and defects of the above-mentioned prior art are, firstly, inaccurate determination and, secondly, complicated determination process and low working efficiency.

[0006] The following search results were obtained by searching the existing public technical literature using keywords such as "compressor; start; pressure difference; identification":

[0007] 1. Chinese patent document: "An air-conditioning compressor pressure difference start-up test structure", patent (application) number: 201721219692.4; the technical solution recorded is:

[0008] "Air conditioning compressor pressure difference start test structure, the tested compressor is connected to the tested compressor controller, and is connected to the tested start switch and power supply through the tested compressor controller, and the tested compressor controller is also connected to the evaporator fan and the condenser fan respectively; the evaporator fan and the condenser fan are connected to the control power supply and the three-way conversion valve; the other two ways of the three-way conversion valve are connected to the first pressure storage bottle and the second pressure storage bottle respectively, the first pressure storage bottle is connected to the pressure pump through a high-pressure protection switch; the second pressure storage bottle is connected to the tested compressor, and the tested compressor is connected to the pressure pump";

[0009] The beneficial technical effects recorded are:

[0010] "By using a pressure-testing device to increase the pressure at the high-pressure end of the compressor being tested and to reduce the balance pressure at the low-pressure end, an automated test structure is formed. This can test whether the compressor starts normally when there is an imbalance between high and low pressure and a certain pressure difference. The entire test structure is relatively simple, the operation process is convenient, the test effect is good, and the efficiency is high."

[0011] 2. Chinese patent document: "Compressor high pressure difference start control method, device and air conditioner", patent (application) number: 201910228533.8; the technical solution recorded is:

[0012] “A compressor high pressure difference start-up control method, device and air conditioner, wherein the method comprises: when the compressor is in an open-loop control mode, starting the compressor according to a preset initial condition; detecting whether the compressor is started successfully, and if so, controlling the compressor to switch to a closed-loop control mode for operation”;

[0013] The beneficial technical effects recorded are:

[0014] "It solves the problem in the prior art that the pressure balancing valve needs to be opened when starting the compressor of multi-system models, and can achieve fast and smooth start-up without opening the air bypass of the unit."

[0015] However, the above disclosed technical solution has not been able to solve the problems and defects of "inaccurate judgment" and "complex judgment process and low working efficiency" in the prior art of compressor starting capacity identification. Utility Model Content

[0016] The utility model provides a compressor starting ability identification device, the purpose of which is to accurately judge the starting ability of the compressor.

[0017] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0018] The utility model discloses a compressor starting ability identification device, wherein the compressor motor comprises a main winding, a starting winding and a PTC starter; the connection point of the main winding and the starting winding constitutes a common end; the main winding constitutes an operating end and is 90° different from the starting winding in space; the starting winding and the PTC starter are connected in series to form a starting end and then connected to the main winding; the compressor is connected to the suction pipe solenoid valve through the suction pipe, is connected to the pressure tank through the exhaust pipe, and is connected to the refrigerant tank through the refrigerant pipe; an electric contact pressure gauge is arranged on the pressure tank, and the electric contact pressure gauge is connected to the electrical control unit through the circuit.

[0019] In the electrical control unit, the pointer of the electric contact pressure gauge is connected to the normally open button SA; the electric contact circuit on the high-pressure side of the electric contact pressure gauge is connected to one end of the K1 coil; the other end of the K1 coil is connected to the common end; the electric contact circuit on the low-pressure side of the electric contact pressure gauge is connected to one end of the K2 coil; the other end of the K2 coil is connected to the common end; the normally open button SA is connected in series with the normally open contact of K2 and one end of the K3 coil in sequence; the other end of the K3 coil is connected to the common end; the normally open button SA is also connected in series with the normally closed contact of K1 and the normally open contact of K2 in sequence; the normally open contact of K2 is then connected to the electric contact circuit on the low-pressure side of the electric contact pressure gauge; the normally open button SA and the operating end are respectively connected to the two ends of the adjustable power supply.

[0020] The normally open button SA is connected in parallel with the normally open contact of K3.

[0021] An intake pipe electromagnetic valve is arranged on the intake pipe; and an intake pipe pressure gauge is arranged on the intake pipe between the intake pipe electromagnetic valve and the compressor.

[0022] The air intake pipe solenoid valve is controlled by the normally open button SB in the electrical control unit; the normally open button SB and the air intake pipe solenoid valve are connected in series and then connected to both ends of the adjustable power supply.

[0023] A first stop valve is arranged on the refrigerant pipe.

[0024] A second stop valve is arranged on the exhaust pipe.

[0025] A power meter is arranged on the circuit where the K3 coil and the K2 coil are connected to the common terminal; an ammeter is arranged on the circuit where the current coil of the power meter is connected to the common terminal; the ammeter forms a series circuit with the main winding, and a voltmeter is arranged to be connected in parallel with the series circuit.

[0026] The refrigerant pipe is replaced with one that is directly connected to the atmosphere.

[0027] The compressor is placed in an oven within a certain temperature range, and the oven temperature range is 38°C to 43°C.

[0028] The beneficial effects of the utility model using the above technical solution are:

[0029] 1. Compressor rotation inertia Ja==T M -T C -T F In order for the compressor to obtain sufficient rotational inertia, the motor torque TM must overcome the compression torque T C and friction torque T F , and the compression torque TC ∝Pressure difference. The greater the pressure difference, the greater the compression torque T C The larger the motor torque T is, the M The larger the pressure difference is, the greater the compression torque is. When the pressure difference is 0, the compression torque is 0. Compared with the prior art, since the compressor needs to overcome the compression torque caused by the pressure difference at the moment of startup, the greater the pressure difference is, the greater the compression torque is, and the greater the starting torque the compressor needs to provide. The existence of this compression torque is equivalent to adding a large load to the compressor in a short period of time, which can well distinguish abnormalities such as no load and light load that cannot be accurately identified due to compressor failure;

[0030] 2. Since this identification method is connected to the refrigerant, it can simulate the actual working environment of the compressor and consider whether it is necessary to examine the compressor startup performance in a high temperature environment as needed. It can truly reflect the compressor startup performance at normal and high temperatures, and provide practical support for the design and selection of compressor motor parameters and fault judgment;

[0031] 3. For any type of compressor, the starting capability can be calibrated by sampling first, and the pressure difference starting performance of the compressor can be quickly identified by the load starting identification device and compared with the compressor with normal calibration, so as to quickly determine whether the compressor has faults, eliminating the quality risks caused by misjudgment of the compressor;

[0032] 4. The above-mentioned electrical wiring device and control method replace the normally open button SA with a rotary switch SA, which is flexible and versatile, and makes full use of the lower limit area of ​​the electric contact pressure gauge. After reaching the set pressure, in the pressure difference starting link, by long pressing the normally open button SA or rotating the rotary switch SA, the normally open contact is closed, and the electric contact pressure gauge is always in a connected circuit. At this time, the electric contact pressure gauge can be connected to the circuit to work; the electric contact pressure gauge acts as a pressure gauge in the upper limit area and connects the circuit. Different from the electric contact pressure gauge stopping at the upper limit, the starting pressure indication is accurate, and the success or failure of the pressure difference start can be accurately identified through the power meter, voltage meter, and current indication value and range;

[0033] 5. The compressor load capacity identification device can be highly integrated and freely moved. When the refrigerant pipe is not connected to the refrigerant, it is particularly suitable for temporary accurate identification and disposal at the customer site or when it is necessary to quickly determine whether the compressor is good or bad. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The contents shown in the attached drawings and the symbols in the drawings are briefly described as follows:

[0035] Figure 1 It is a schematic diagram of the connection structure of the utility model;

[0036] Figure 2 for Figure 1 Schematic diagram of the piping structure of the oven with the compressor placed in it;

[0037] Figure 3 This is a schematic diagram of the utility model in which the refrigerant pipe is replaced with one that is directly connected to the atmosphere;

[0038] Figure 4 This is a schematic diagram of electrical wiring of the utility model;

[0039] Figure 5 A wiring diagram of a power meter, an ammeter and a voltmeter for the electrical control unit of the utility model;

[0040] Figure 6 This is a schematic diagram of electrical wiring of another embodiment of the present invention.

[0041] The markings in the figure are:

[0042] 1. Suction pipe solenoid valve; 2. Normally open button SB; 3. Suction pipe pressure gauge; 4. Compressor; 4.1. Common terminal; 4.2. Starting winding; 4.3. Starting terminal; 4.4. Main winding; 4.5. Running terminal; 5. Electrical control unit; 6. Electric contact pressure gauge; 7. Pressure tank; 8. Exhaust pipe; 9. Suction pipe; 10. Refrigerant pipe; 11. First stop valve; 12. Refrigerant tank; 13. Adjustable power supply; 14. K2 coil; 15. K1 coil; 16. K3 coil; 17. K2 normally open contact; 18. Normally open button SA; 19. K3 normally open contact; 20. K2 normally open contact; 21. K1 normally closed contact; 22. PTC starter; 23. Power meter; 24. Ammeter; 25. Voltmeter; 26. Second stop valve; 28. Oven.

[0043] exist Figure 4 , Figure 5 and Figure 6 In the figure, (1), (2), and (3) represent the first branch, the second branch, and the third branch, respectively. DETAILED DESCRIPTION

[0044] The specific implementation methods of the utility model are further explained in detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the utility model.

[0045] like Figures 1 to 6 The structure of the utility model shown is a compressor starting ability identification device.

[0046] The compressor motor comprises a main winding 4.4, a starting winding 4.2 and a PTC starter 22; the connection point of the main winding 4.4 and the starting winding 4.2 constitutes a common terminal 4.1; the main winding 4.4 constitutes a running terminal 4.5, and is 90° apart from the starting winding in space; the starting winding 4.2 and the PTC starter 22 are connected in series to form a starting terminal 4.3, and then connected to the main winding connection 4.4.

[0047] Embodiment 1:

[0048] In order to solve the problems existing in the prior art and overcome its defects, and to achieve the invention purpose of accurately judging the starting capacity of the compressor, the technical solution adopted by the utility model is:

[0049] like Figures 1 to 6 The structure of the utility model shown is a compressor starting capacity identification device, wherein the compressor 4 is connected to the suction pipe solenoid valve 1 through the suction pipe 9, is connected to the pressure tank 7 through the exhaust pipe 8, and is connected to the refrigerant tank 12 through the refrigerant pipe 10; an electric contact pressure gauge 6 is arranged on the pressure tank 7, and the electric contact pressure gauge 6 is connected to the electrical control unit 5 through the circuit.

[0050] The compressor starting capacity identification device of the utility model, the pressure tank 7 is arranged on the exhaust pipe 8 connected to the compressor 4; the electric contact pressure gauge 6 is arranged on the pressure tank 7; the pressure tank 7 is connected to the second stop valve 26 through a pipeline, and the second stop valve 26 adjusts the pressure tank 7 to the required pressure setting value by releasing the refrigerant;

[0051] The electric contact pressure gauge 6 displays the pressure of the pressure tank, which is the exhaust pressure of the compressor. The exhaust pressure can be set according to the specifications of the compressor and is generally set to 0.1-0.3 MPa (gauge pressure).

[0052] Based on the above technical solution, Figure 4 As shown, the on-off control of the electric contact pressure gauge 6 is controlled by the electrical control unit 5; the electrical wiring of the electrical control unit 5 corresponding to the compressor load capacity identification device is:

[0053] In the electrical control unit 5, the pointer of the electric contact pressure gauge 6 is connected to the normally open button SA18; the electric contact circuit on the high-pressure side of the electric contact pressure gauge 6 is connected to one end of the K1 coil 15; the other end of the K1 coil 15 is connected to the common terminal 4.1; the electric contact circuit on the low-pressure side of the electric contact pressure gauge 6 is connected to one end of the K2 coil 14; the other end of the K2 coil 14 is connected to the common terminal 4.1; the normally open button SA18 is connected in series with the K2 normally open contact 17 and one end of the K3 coil 16 in sequence; the other end of the K3 coil 16 is connected to the common terminal 4.1; the normally open button SA18 is also connected in series with the K1 normally closed contact 21 and the K2 normally open contact 20 in sequence; the K2 normally open contact 20 is then connected to the electric contact circuit on the low-pressure side of the electric contact pressure gauge 6; the normally open button SA18 and the operating terminal 4.5 are respectively connected to the two ends of the adjustable power supply 13.

[0054] After the normally open button SA18 is connected in parallel with the normally open contact 19 of K3, the first branch in the output end is connected with the normally open contact 17 of K2, and the normally open contact 17 of K2 is connected in series with the coil 16 of K3;

[0055] The other branch of one end of the normally open button SA18 connected in parallel with the normally open contact 19 of K3 is connected to the pointer of the electric contact pressure gauge 6, and the pointer end of the electric contact pressure gauge 6 can be connected to the electric contacts on both sides respectively;

[0056] The normally open button SA18 is connected in parallel with the normally open contact 19 of K3.

[0057] An intake pipe solenoid valve 1 is provided on the intake pipe 9 ; an intake pipe pressure gauge 3 is provided on the intake pipe 9 between the intake pipe solenoid valve 1 and the compressor 4 .

[0058] The compressor 4 is connected to the suction pipe solenoid valve 1 through the compressor suction pipe 9; the suction pipe pressure gauge 3 is arranged on the compressor suction pipe 9 between the suction pipe solenoid valve 1 and the compressor 4, and the suction pipe pressure gauge 3 displays the filling pressure of the refrigerant.

[0059] When the electric contact pressure gauge 6 is set to a lower pressure, the pointer end of the electric contact pressure gauge 6 is connected to the low-pressure side electric contact circuit, the low-pressure side electric contact circuit is output from the electric contact pressure gauge 6, and is connected to the compressor common terminal 4.1 through the K2 coil 14.

[0060] When the set pressure of the electric contact pressure gauge 6 reaches the upper limit pressure, the pointer end of the electric contact pressure gauge 6 is connected to the high-voltage side electric contact circuit, the third branch is in a power-off state, the first branch K3 coil 16 is powered off, the branch leading to the compressor common terminal 4.1 is powered off, and the compressor stops working.

[0061] The third branch at one output end passes through the K1 normally closed contact 21 and the K2 normally open contact 20 and then merges with the second branch from the low-voltage side electric contact line of the electric contact pressure gauge 6, and passes through the K2 coil 14 together; the first branch flows out from the K3 coil 16, the second branch flows out from the K1 coil 15, and the three branches flowing out from the K2 coil 14 merge and enter the compressor common end 4.1.

[0062] The air intake pipe solenoid valve 1 is controlled by the normally open button SB2 in the electrical control unit 5 ; the normally open button SB2 and the air intake pipe solenoid valve 1 are connected in series and then connected to both ends of the adjustable power supply 13 .

[0063] The normally open button SB2 is connected in series with the air intake pipe solenoid valve 1 , and the series circuit is connected in parallel with the adjustable power supply 13 .

[0064] A first stop valve 11 is provided on the refrigerant pipe 10 .

[0065] The compressor 4 is connected to the refrigerant tank 12 via a refrigerant pipe 10 and a first stop valve 11 , and the refrigerant filling amount is controlled by the first stop valve 11 .

[0066] A second stop valve 26 is provided on the exhaust pipe 8 .

[0067] The above technical solution has the following beneficial effects:

[0068] Since the compressor needs to overcome the compression torque caused by the pressure difference at the moment of starting, the greater the pressure difference, the greater the compression torque, and the compressor needs to provide a greater starting torque. The existence of this compression torque is equivalent to adding a larger load to the compressor in a short period of time, which can well distinguish abnormalities such as no load and light load that cause compressor failures to be unable to be accurately identified.

[0069] Since this identification method is connected to the refrigerant, it can simulate the actual working environment of the compressor and consider whether the compressor startup performance needs to be examined in a high temperature environment as needed. It can truly reflect the compressor startup performance at normal and high temperatures, and provide practical support for the design and selection of compressor motor parameters and fault judgment.

[0070] Embodiment 2:

[0071] Based on the above technical solution, Figure 5 As shown, a power meter 23 is provided in the circuit where the K3 coil 16, K3 coil 16 and K2 coil 14 are connected to the common terminal 4.1; an ammeter 24 is provided in the circuit where the current coil of the power meter 23 is connected to the common terminal 4.1; the ammeter 24 forms a series circuit with the main winding 4.4, and a voltmeter 25 is provided and connected in parallel with the series circuit.

[0072] The three branches are connected to the power meter 23 after merging, and the current coil of the power meter 23 is connected in series with the ammeter 24 and enters the common terminal 4.1; the voltage coil of the power meter 23 is connected in parallel with the main winding 4.4, the power meter 23 displays the power during pressure difference startup, and the ammeter (A) displays the current flowing through the compressor 4 during pressure difference startup.

[0073] In addition to the beneficial effects described in Example 1, the above technical solution also enables the electric contact pressure gauge to shut down at the upper limit, with accurate starting pressure indication, and accurately identify whether the pressure difference start-up is successful or not through the power meter, voltmeter, and current indication value and range.

[0074] Embodiment three:

[0075] Based on the above technical solution, Figure 2 As shown, the compressor 4 is placed in an oven 28 within a certain temperature range, and the temperature range of the oven 28 is 38°C to 43°C.

[0076] If it is necessary to simulate the user's starting performance at high temperature, the compressor 4 can be placed in an oven 28 that can be heated and kept at a constant temperature; the temperature of the oven 28 is set between 38 and 43°, and steps 1 to 7 are repeated to determine the starting performance of the compressor 4 at high temperature.

[0077] The opening or closing of the electromagnetic valve on the refrigerant pipeline of the compressor and the suction pipe ensures that the compressor directly supplies refrigerant and ensures that, specifically, when the refrigerant tank is R600a, the machine stops when the electric contact pressure gauge reaches the set pressure, the pressure gauge connected to the suction pipe displays a negative pressure, the stop valve is opened, and the refrigerant enters the compressor through the stop valve to ensure that the pressure is "0" MPa (gauge pressure) or the set suction pressure value, such as 0.1 MPa (gauge pressure); when the refrigerant tank is R290 or R134a, the machine stops when the electric contact pressure gauge reaches the set pressure, the pressure gauge connected to the suction pipe displays a positive pressure, the electromagnetic valve is opened, and the refrigerant is allowed to pass through the electromagnetic valve to release the excess refrigerant in the compressor, ensuring that the pressure connected to the compressor and the suction pipe is "0" MPa (gauge pressure) or the set suction pressure value, such as 0.1 MPa (gauge pressure), and one end of the pipe connected to the electromagnetic valve for venting is connected to a recovery tank or leads to an open atmospheric environment.

[0078] Furthermore, the compressor is connected to the power supply, the stop valve is opened, and the solenoid valve is closed. When the electric contact pressure gauge connected to the pressure tank reaches the set upper limit pressure, such as 0.1-0.3 MPa (gauge pressure), the electrical control unit connected to the electric contact pressure gauge controls the compressor to stop. By adjusting the solenoid valve or the stop valve, the suction end of the compressor is ensured to be "0" MPa (gauge pressure) or the set suction pressure value, such as 0.1 MPa (gauge pressure). The electric contact pressure gauge and the suction end pressure indication value are observed, and the pressure difference between the two is ensured to be 0.1 or 0.2 MPa (gauge pressure). The electric contact pressure stop pointer is readjusted upwards. If the compressor stops at 0.9-1.2 MPa (gauge pressure), the starter is replaced, and the power supply is reconnected. If the compressor is compared with a compressor with qualified starting performance calibrated in advance, there is no difference in the pressure difference start-up, indicating that the compressor is fault-free and should be a normal machine; if the compressor does not start or starts at a higher voltage, it should be determined as a faulty machine. The differential pressure start-up is generally identified within 6 to 10 minutes.

[0079] Since this identification method is connected to the refrigerant, it can simulate the actual working environment of the compressor and consider whether it is necessary to examine the starting performance of the compressor in a high temperature environment as needed. It can truly reflect the starting performance of the compressor at normal and high temperatures, and provide practical support for the design selection of compressor motor parameters and fault judgment.

[0080] Embodiment 4:

[0081] The utility model also provides an identification method for a compressor starting capability identification device, the process of which is as follows:

[0082] Step 1: Determine the compressor working medium type according to the compressor nameplate model, and identify 1 to 3 normal compressors;

[0083] Step 2: Connect the quick connector to a normal compressor according to the three-tube mark of compressor 4;

[0084] Step 3, open the refrigerant valve, and open the first stop valve 11, and use the higher pressure of the refrigerant tank 12 to flow into the compressor 4;

[0085] Activate the normally open button SB2 to open the suction pipe solenoid valve 1, so that the suction pipe 9 is connected to the external atmosphere, and the air in the compressor 4 is discharged through the flow of refrigerant;

[0086] Close the normally open button SB2 and close the suction pipe solenoid valve 1;

[0087] Step 4: Repeat step 3 2 to 3 times until all the air in compressor 4 is exhausted;

[0088] Step 5, setting the upper limit pressure value of the electric contact pressure gauge 6, such as 0.1-0.3 MPa gauge pressure;

[0089] Press the normally open button SA18, the current passes through the pointer of the electric contact pressure gauge 6 and is connected to the lower limit range of the low-pressure side of the electric contact pressure gauge 6, the branch passes through the K2 coil 14 to the junction point, the branch is turned on, the K2 coil 14 is energized, the K2 normally open contact 17 is closed, the first branch K3 coil 16 is energized, the K3 normally open contact 19 is closed, and self-locking is achieved. The current flows into the two-phase winding of the compressor 4 distributed at 90 degrees, the compressor 4 starts, the pointer of the electric contact pressure gauge 6 is always in contact with the low-pressure side branch, the compressor 4 is always energized, and the pointer of the electric contact pressure gauge 6 keeps rising;

[0090] When the pointer of the electric contact pressure gauge 6 reaches or exceeds the set upper limit pressure, such as 0.1-0.3 MPa gauge pressure, the pressure in the pressure tank 7 is adjusted to meet the required set value by adjusting the second stop valve 26;

[0091] The upper limit pressure value is located on the high-pressure side (right side) of the electric contact pressure gauge 6, the pointer of the electric contact pressure gauge 6 is disconnected from the low-pressure side branch and connected to the high-pressure side branch, the K1 coil 15 is energized, the K1 normally closed contact 21 is disconnected, the third branch is in a power-off state, the K2 coil 14 is powered off, the K2 normally open contact 17 changes from being connected to being normally open, the first branch K3 coil 16 is powered off, the K3 normally open contact 19 changes from being closed to being normally open, and is no longer self-locking; the branch leading to the common terminal 4.1 of the compressor is powered off, the compressor 4 stops working, and the PTC starter 22 is replaced;

[0092] Step 6, observe the suction pipe pressure gauge 3 connected to the suction pipe 9 to see if it is 0 or other set pressure;

[0093] If the suction pipe pressure gauge 3 is not 0 or the non-set pressure, adjust the first stop valve 11 or connect the suction pipe solenoid valve 1 to make the suction pipe pressure gauge 3 at the set pressure, and then keep pressing the normally open button SA18, the normally open button SA18 is turned on, the current flows through the normally open button SA18, through the pointer of the electric contact pressure gauge 6 and the high-pressure side (right side) branch of the electric contact pressure gauge 6, the second branch is in the conducting state, the current flows through the K1 coil 15 to the compressor common terminal 4.1, the two-phase winding of the compressor 4 is energized, the compressor 4 is ready to start, and it is judged whether the compressor 4 starts under the set pressure difference;

[0094] If it can be started, record the voltage data input for starting, release the normally open button SA18, disconnect the second branch, and continue to lower the voltage, observe the suction pipe pressure gauge 3 again, open the second stop valve 26 to adjust the pressure of the pressure tank 7 to the required set value, such as 0.1-0.3MPa (gauge pressure), and then keep pressing the normally open button SA18, and the normally open button SA18 is turned on;

[0095] Repeat the above steps until the lowest starting voltage is recorded;

[0096] According to the above steps, record the pressure difference starting voltage values ​​of 1 to 3 normal compressors and take their average value to complete the calibration;

[0097] Step 7: Perform differential pressure start on the compressor suspected of failure according to steps 2 to 6, record the lowest starting voltage, and compare it with the compressor 4 that is calibrated to be normal:

[0098] If there is a difference from the calibrated value, and the differential pressure starting voltage is higher than that of a normal compressor, it indicates that there is some fault in the compressor;

[0099] If the pressure difference starting voltage is lower than that of a normal compressor 4 or is consistent with that of a normal compressor 4, it can be determined that the compressor suspected of failure is actually a normal compressor.

[0100] The upper limit pressure value ranges from 0.1 to 0.3 MPa.

[0101] In the steps 6 and 7, by observing the ammeter 24 connected in series to the common terminal, the voltmeter 25 and the power meter 23 connected in parallel to the winding, the lowest voltage and starting current of the compressor pressure difference starting under different voltages can be recorded;

[0102] If the current shown on the ammeter 24 is obviously 2 to 4 times or even higher than the rated current of the compressor, and the power is also 2 to 4 times or even higher than the rated power, it indicates that the pressure differential start of the compressor has not been successful;

[0103] If the current and power are lower than the rated current and rated power or are basically equivalent, it indicates that the compressor pressure differential start is successful.

[0104] For any type of compressor, the starting capability can be calibrated first, and the compressor pressure difference starting performance can be quickly identified through the load starting identification device and compared with the calibrated normal compressor, so as to quickly determine whether the compressor has a fault and eliminate the quality risks caused by misjudgment of the compressor.

[0105] Embodiment five:

[0106] Based on the above technical solution, Figures 4 to 6 As shown, one end of the normally open button SA18 is connected to the adjustable power supply 13, and the other end of the adjustable power supply 13 is connected to one end of the compressor main winding 4.4; the adjustable power supply 13 is an AC power supply with adjustable frequency and voltage, and the frequency is 50Hz, 60Hz, or other frequencies; the voltage is 110V, and the adjustable range is 70V to 130V on the basis of 110V; or, the voltage can be 220V, and the adjustable range is 145V to 240V on the basis of 220V.

[0107] The current coil of the power meter 23 is connected in series with the ammeter 24 and enters the common terminal 4.1; the voltage coil of the power meter 23 is connected in parallel with the main winding 4.4; the power meter 23 displays the power when the pressure difference is started; the ammeter A displays the current flowing through the compressor 4 when the pressure difference is started.

[0108] A power meter 23 is provided on the circuit in which the K3 coil 16, the K3 coil 16 and the K2 coil 14 are connected to the common terminal 4.1; an ammeter 24 is provided on the circuit in which the current coil of the power meter 23 is connected to the common terminal 4.1; the ammeter 24 forms a series circuit with the main winding 4.4, and a voltmeter 25 is provided and connected in parallel with the series circuit.

[0109] The three branches are connected to the power meter 23 after merging, and the current coil of the power meter 23 is connected in series with the ammeter 24 and enters the common terminal 4.1; the voltage coil of the power meter 23 is connected in parallel with the main winding 4.4, the power meter 23 displays the power during pressure difference startup, and the ammeter (A) displays the current flowing through the compressor 4 during pressure difference startup.

[0110] Embodiment six:

[0111] On the basis of the above technical solution, the normally open button SA18 is replaced by a rotary switch, and the connection and disconnection of the adjustable power supply 13 are controlled by the rotary switch: when the rotary switch is turned, the normally open contacts of the rotary switch are closed, and the adjustable power supply 13 is connected in coordination with other circuits; when the rotary switch is turned again, the normally open contacts of the rotary switch are disconnected, and the adjustable power supply 13 is disconnected in coordination with other circuits.

[0112] After the normally open button SA18 is replaced with a rotary switch, the calibrated normal machine is compared with the suspected faulty machine to determine whether the suspected faulty compressor is a real faulty compressor.

[0113] The above-mentioned electrical wiring device and control method replace the normally open button SA with a rotary switch SA, which is flexible and versatile, and makes full use of the lower limit area of ​​the electric contact pressure gauge. After reaching the set pressure, in the pressure difference starting link, by long pressing the normally open button SA or rotating the rotary switch SA, the normally open contact is closed, and the electric contact pressure gauge is always in a connected branch. At this time, the electric contact pressure gauge can be connected to the circuit to work; the electric contact pressure gauge acts as a pressure gauge in the upper limit area and connects the circuit. Different from the electric contact pressure gauge that stops at the upper limit, the starting pressure indication is accurate, and the power meter, voltmeter, and current indication value and range can be used to accurately identify whether the pressure difference start is successful or not.

[0114] Replace the normally open SA button with a rotary switch SA, turn the rotary switch SA, the current passes through the electric contact pressure gauge 6 pointer and is connected to the lower limit range on the left end, the branch passes through the K2 coil 14 to the junction point, the branch is turned on, the K2 coil 14 is energized, the K2 normally open contact 2017 is closed, the first branch K3 coil is energized, the K3 normally open contact 19 is closed, the current flows into the two-phase winding of the compressor 4 distributed at 90 degrees, the compressor 4 starts, the electric contact pressure gauge 6 pointer is always in contact with the left branch, and the compressor 4 is always energized;

[0115] The pointer of the electric contact pressure gauge 6 keeps rising. When the pointer of the electric contact pressure gauge 6 has not reached the set value, the rotary switch SA is turned again to restore the closed contact through SA to normally open; the current is disconnected through the rotary switch SA. When the pointer of the electric contact pressure gauge 6 reaches the set upper limit pressure, such as 0.1-0.3MPa gauge pressure, the upper limit pressure is located on the right side of the electric contact pressure gauge 6, the pointer is disconnected from the left branch and connected to the right branch, the K1 coil 15 is energized, the normally closed contact K121 is disconnected, the third branch is in a power-off state, the K2 coil 14 is powered off, the K2 normally open contact 17 changes from being connected to being normally open, the first branch K3 coil 16 is powered off, the K3 normally open contact 19 changes from being closed to being normally open, the branch leading to the common end of the compressor 4 is powered off, the compressor 4 stops working, and the PTC starter 22 is replaced to start the pressure difference start;

[0116] Turn the rotary switch SA again, the SA contact is normally open and connected, and the current passes through the SA contact, and the pointer of the pressure gauge 6 is connected to the right branch of the pressure gauge through the electrical contact. The second branch is in the on state, and the current flows through the K1 coil 15 to the common end of the compressor 4. The main and auxiliary two-phase windings of the compressor 4 are energized, and the compressor 4 is ready to start; by observing the ammeter 24 connected in series to the common end, the voltmeter 25 and the power meter 23 connected in parallel with the winding, the lowest voltage and starting current of the compressor pressure difference start under different voltages can be recorded;

[0117] If the current shown on the ammeter 24 is obviously 2 to 4 times higher than the rated current of the compressor or even higher, and the power is also 2 to 4 times higher than the rated power or even higher, it indicates that the pressure differential start of the compressor has not been successful;

[0118] If the current and power are lower than the rated current and rated power, or are basically equivalent, it indicates that the compressor pressure difference start-up is successful; whether the compressor starts under the set pressure difference, if it can start, record the voltage and current values ​​input for startup.

[0119] Embodiment seven:

[0120] On the basis of the above technical solution: Figure 3 As shown, the refrigerant pipe 10 is directly connected to the atmosphere.

[0121] On the refrigerant pipeline, the refrigerant pipeline is directly connected to the atmosphere. The suction end is displayed as 0MPa (gauge pressure). When the process pipe is connected to the atmosphere, since the compressor is not charged with refrigerant, the entire compressor pressure difference start-up time is further shortened; the confirmation process also becomes simple and efficient, directly replacing the refrigerant with air, and the compressor load capacity identification device can be highly integrated and freely movable. When the refrigerant pipe is not connected to the refrigerant, it is particularly suitable for temporary accurate identification and disposal at the customer site or when it is necessary to quickly determine whether the compressor is good or bad.

[0122] Embodiment eight:

[0123] On the basis of the above technical solution: Figure 6 As shown, another embodiment of the utility model, that is, the motor main circuit and the control circuit are no longer connected in series, but in parallel.

[0124] By adjusting the first stop valve 11 or connecting the suction pipe solenoid valve 1, the suction pipe pressure gauge 3 is at the set pressure, and then the normally open button SA18 is pressed or the rotary switch is turned on, the normally open button SA18 or the rotary switch is turned on, and the current flows through the normally open button SA18 or the rotary switch, and the pointer of the electric contact pressure gauge 6 is connected to the high-voltage side (right side) branch of the electric contact pressure gauge 6, and the second branch is in the conducting state, and the current flows through the K1 coil 15 to be energized, and the normally open contact 15 on the parallel control circuit is closed, and the current reaches the compressor common terminal 4.1 through K1, and the two-phase winding of the compressor 4 is energized, and the compressor 4 is ready to start, and it is judged whether the compressor 4 starts under the set pressure difference;

[0125] If it can be started, record the voltage data input for starting, release the normally open button SA18 or turn the rotary switch again, disconnect the second branch, and continue to lower the voltage, observe the suction pipe pressure gauge 3 again, open the second stop valve 26 to adjust the pressure of the pressure tank 7 to the required set value, such as 0.1-0.3MPa (gauge pressure), and then keep pressing the normally open button SA18 or turn the rotary switch, the normally open button SA18 or the rotary switch is turned on;

[0126] Repeat the above steps until the lowest starting voltage is recorded.

[0127] Therefore, the voltages of the relay and the motor winding are constant and do not interfere with each other, thus maintaining the stability of the drive circuit and the control circuit; the obtained compressor pressure difference starting voltage is more accurate.

[0128] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the utility model, or the concept and technical solution of the utility model are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A compressor starting capability identification device, the compressor motor comprising a main winding (4.4), a starting winding (4.2) and a PTC starter (22); the connection point of the main winding (4.4) and the starting winding (4.2) constitutes a common end (4.1); the main winding (4.4) constitutes a running end (4.5) and is 90° away from the starting winding (4.2) in space; the starting winding (4.2) and the PTC starter (22) are connected in series to form a starting end (4.3) which is then connected to the main winding (4.4); characterized in that: The compressor (4) is connected to the suction pipe solenoid valve (1) through the suction pipe (9), connected to the pressure tank (7) through the exhaust pipe (8), and connected to the refrigerant tank (12) through the refrigerant pipe (10); an electric contact pressure gauge (6) is arranged on the pressure tank (7), and the electric contact pressure gauge (6) is connected to the electrical control unit (5) through the circuit.

2. The compressor starting capability identification device according to claim 1, characterized in that: In the electrical control unit (5), the pointer of the electric contact pressure gauge (6) is connected to the normally open button SA (18); the electric contact circuit on the high-voltage side of the electric contact pressure gauge (6) is connected to one end of the K1 coil (15); the other end of the K1 coil (15) is connected to the common terminal (4.1); the electric contact circuit on the low-voltage side of the electric contact pressure gauge (6) is connected to one end of the K2 coil (14); the other end of the K2 coil (14) is connected to the common terminal (4.1); the normally open button SA (18) is connected in series with the K2 normally open contact (17) and one end of the K3 coil (16) in sequence; the other end of the K3 coil (16) is connected to the common terminal (4.1); the normally open button SA (18) is also connected in series with the K1 normally closed contact (21) and the K2 normally open contact (20) in sequence; the K2 normally open contact (20) is further connected to the electric contact circuit on the low-voltage side of the electric contact pressure gauge (6); the normally open button SA (18) and the operating terminal (4.5) are respectively connected to the two ends of the adjustable power supply (13).

3. The compressor starting capability identification device according to claim 2, characterized in that: The normally open button SA (18) is connected in parallel with the normally open contact K3 (19).

4. The compressor starting capability identification device according to claim 1, characterized in that: An intake pipe electromagnetic valve (1) is arranged on the intake pipe (9); and an intake pipe pressure gauge (3) is arranged on the intake pipe (9) between the intake pipe electromagnetic valve (1) and the compressor (4).

5. The compressor starting capability identification device according to claim 2, characterized in that: The air intake pipe solenoid valve (1) is controlled by the normally open button SB (2) in the electrical control unit (5); the normally open button SB (2) and the air intake pipe solenoid valve (1) are connected in series and then connected to both ends of an adjustable power supply (13).

6. The compressor starting capability identification device according to claim 1, characterized in that: A first stop valve (11) is provided on the refrigerant pipe (10).

7. The compressor starting capability identification device according to claim 1, characterized in that: A second stop valve (26) is provided on the exhaust pipe (8).

8. The compressor starting capability identification device according to claim 2, characterized in that: A power meter (23) is provided on a circuit in which the K3 coil (16) and the K2 coil (14) are connected to a common terminal (4.1); an ammeter (24) is provided on a circuit in which the current coil of the power meter (23) is connected to the common terminal (4.1); the ammeter (24) and the main winding (4.4) form a series circuit, and a voltmeter (25) is provided and connected in parallel with the series circuit.

9. The compressor starting capability identification device according to claim 1, characterized in that: The refrigerant pipe (10) is replaced with one that is directly connected to the atmosphere.

10. The compressor starting capability identification device according to claim 1, characterized in that: The compressor (4) is placed in an oven (28) within a certain temperature range, and the temperature range of the oven (28) is 38°C to 43°C.

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