A comprehensive performance detection system of an electronic expansion valve

Abstract

This invention discloses a comprehensive performance testing system for an electronic expansion valve. One end of an electric proportional valve is connected to the outlet of a gas storage tank via a booster pump, and the other end is sequentially connected to valve 1, a first pressure sensor, valve 3, valve 6, a second pressure sensor, a stepping solenoid valve, valve 8, and a first flow meter. One end of valve 2 is connected between valve 1 and the first pressure sensor, and the other end is left unconnected. One end of valve 5 is connected to the connection point of valve 3 and the first pressure sensor, and the other end is connected to one end of valve 4. The other end of valve 4 is connected to the connection point of valve 6 and the second pressure sensor. One end of valve 7 is connected between the first pressure sensor and the stepping solenoid valve, and the other end is left unconnected. One end of valve 9 is connected between the stepping solenoid valve and valve 8, and the other end is connected to the second flow meter. The inlet and outlet of the electronic expansion valve under test are connected between valve 3 and valve 6, and between valve 5 and valve 4, respectively.

Description

Technical Field

[0001] This utility model relates to the field of testing technology, specifically to a comprehensive performance testing system for electronic expansion valves. Background Technology

[0002] An electronic expansion valve is a throttling element that allows refrigerant flow into a refrigeration unit according to a preset program. It consists of two main components: a valve body and a coil. Using an electrical signal generated by the regulated parameter, the voltage or current applied to the coil is controlled, which in turn controls the movement of the valve core within the valve body, thereby regulating the refrigerant supply. It is widely used in refrigeration, air conditioning, and heat pump systems.

[0003] To ensure the reliability of electronic expansion valves during use, they must undergo a series of rigorous tests before leaving the factory, including internal leakage testing, valve opening step count testing, air flow testing, MOPD testing, reverse valve opening testing, and backtracking testing. However, existing electronic expansion valve performance testing equipment can usually only complete a single test item. The entire performance testing process requires operators to perform multiple clamping operations, which may not only lead to product damage but also seriously affect testing efficiency.

[0004] Therefore, it is necessary to design a comprehensive performance testing system for electronic expansion valves that can simultaneously complete multiple testing items, thereby improving testing efficiency, meeting the needs of large-volume and rapid testing, and reducing product damage caused by repeated clamping. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a comprehensive performance testing system for electronic expansion valves. By using the switching of air valves to form different test circuits, it achieves comprehensive performance testing of electronic expansion valves, improves testing efficiency, and reduces product loss caused by repeated clamping.

[0006] A comprehensive performance testing system for an electronic expansion valve includes a filter pressure reducing valve, an air tank, a booster pump, an electrical proportional valve, nine air valves, a differential pressure transmitter, a stepper solenoid valve, two pressure sensors, and two flow meters.

[0007] The air inlet of the gas storage tank is connected to the filter and pressure reducing valve. One end of the electrical proportional valve is connected to the air outlet of the gas storage tank via a booster pump, and the other end is connected to one end of valve 1. One end of valve 2 and the first pressure sensor is connected to the other end of valve 1, while the other end of valve 2 is left empty. The other end of the first pressure sensor is connected to one end of the second pressure sensor via valves 3 and 6, and also via valves 5 and 4. The connection points between valves 3 and 6, and between valves 5 and 4, are respectively connected to both ends of a differential pressure transmitter. Simultaneously, both ends of the differential pressure transmitter are connected to the air inlet and outlet of the electronic expansion valve under test. The other end of the second pressure sensor is connected to one end of valve 7 and the stepping solenoid valve. The other end of valve 7 is left empty. The other end of the stepper solenoid valve is connected to one end of valves 8 and 9 respectively. The other end of valve 8 is connected to the first flow meter, and the other end of valve 9 is connected to the second flow meter. The first flow meter has a flow rate of ml / min, and the second flow meter has a flow rate of L / min.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] By combining air valves with flow meters of different ranges, performance testing of multiple items can be completed at a single testing station. Utilizing air tanks and booster pumps along with multiple independent air lines provides an independent air source for each testing station, increasing the air supply rate, maintaining pressure stability, and enabling simultaneous performance testing of multiple valves, thus improving testing efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the independent air path of this utility model. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] like Figure 1 As shown, a comprehensive performance testing system for an electronic expansion valve includes a filter pressure reducing valve, an air tank, a booster pump, an electrical proportional valve, nine air valves, a differential pressure transmitter, a stepper solenoid valve, two pressure sensors, and two flow meters.

[0013] The air inlet of the gas storage tank is connected to a filter pressure reducing valve. One end of the electrical proportional valve is connected to the air outlet of the gas storage tank via a booster pump, and the other end is connected to one end of valve 1, used to control the amount of gas entering the pipeline. One end of valve 2 and the first pressure sensor is connected to the other end of valve 1, and the other end of valve 2 is left empty to purge the air from the pipeline after the test. The other end of the first pressure sensor is connected to one end of the second pressure sensor via valves 3 and 6, and also via valves 5 and 4. The pressure sensor is used to measure the gas pressure in the pipeline. The connection points of valves 3 and 6, and valves 5 and 4, are respectively connected to both ends of a differential pressure transmitter. The two ends of the differential pressure transmitter are connected to the air inlet and outlet of the electronic expansion valve under test. The other end of the second pressure sensor is connected to one end of valve 7 and the stepping solenoid valve. The other end of valve 7 is left empty to purge the air from the pipeline after the test. The other end of the stepper solenoid valve is connected to one end of air valve No. 8 and one end of air valve No. 9 respectively. The other end of air valve No. 8 is connected to the first flow meter, and the other end of air valve No. 9 is connected to the second flow meter.

[0014] The first flow meter has a range of 5~2000 ml / min, and the second flow meter has a range of 0.1~1000 L / min.

[0015] Using the comprehensive performance testing system described above, six performance tests can be completed, specifically:

[0016] ① Valve opening step count test:

[0017] Close air valves 2 and 7, and open air valves 1, 3, 4, and 9, as well as the stepping solenoid valve, to provide inlet pressure to the electronic expansion valve. Slowly open the valve port using the coil control within the coil quick-change fixture, and read the outlet flow rate data measured by the second flow meter. When the outlet flow rate exceeds 1 L / min, record it as the valve opening point. Continue slowly opening the valve port, recording the number of valve opening steps when the outlet flow rate exceeds 1 L / min.

[0018] ② Maximum action pressure difference test:

[0019] Close air valves 2 and 7, and open air valves 1, 3, 4, and 9, as well as the stepper solenoid valve, to provide the minimum operating voltage to the electronic expansion valve. Control the air intake through the proportional valve, and introduce 1.03 MPa of dry air into the valve body inlet. Adjust the valve opening to 30% using the coil control in the coil quick-change fixture, and read the data Q1 L / min from the second flow meter. Close the valve opening and introduce 2.5 MPa of dry air into the valve body inlet. Then, sequentially adjust the valve opening to 0%, 100%, 0%, and 30%, repeating this process multiple times. Finally, with the electronic expansion valve at 30% opening, introduce 1.03 MPa of dry air into the valve body inlet and read the data Q2 L / min from the second flow meter. Calculate |Q2 - Q1| as the maximum operating pressure difference.

[0020] ③ Hysteresis test:

[0021] Close air valves 2 and 7, and open air valves 1, 3, 4, and 9, as well as the stepping solenoid valve, to provide the rated voltage to the electronic expansion valve. Introduce 1.03 MPa of dry air into the valve body inlet. Perform an initialization operation on the electronic expansion valve, and then close the valve port. After the system stabilizes, measure the rising and falling flow curves of the electronic expansion valve at each opening degree, with an interval not exceeding 1% of the nominal fully open step count. Calculate the step difference at the same flow point as the hysteresis test result.

[0022] ④ Reverse valve opening pressure difference test:

[0023] Close air valves 2 and 7, and open air valves 1, 5, and 6. Close the electronic expansion valve port, slowly increase the pressure to the valve body outlet, and measure the pressure that opens the valve port.

[0024] ⑤ Airflow test:

[0025] Close air valves 2 and 7, open air valves 1, 3, 4, and 9 and the stepper solenoid valve to provide a certain inlet pressure to the electronic expansion valve. Adjust the stepper solenoid valve to make the inlet and outlet pressure difference of the electronic expansion valve 0.2 MPa, and read the outlet flow data measured by the second flow meter.

[0026] ⑥ Internal leakage test:

[0027] Close air valves 2 and 7, open air valves 1, 3, 4, 8 and the stepper solenoid valve. At room temperature, keep the electronic expansion valve closed and introduce 1.03 MPa of dry air into the inlet of the electronic expansion valve. Read the first flow count value as the air leakage at the outlet of the electronic expansion valve.

[0028] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A comprehensive performance testing system for an electronic expansion valve, comprising a filter pressure reducing valve, an air tank, a booster pump, an electrical proportional valve, and an air valve, characterized in that: The air inlet of the gas storage tank is connected to the filter pressure reducing valve; one end of the electrical proportional valve is connected to the air outlet of the gas storage tank via a booster pump, and the other end is connected to one end of valve 1; one end of valve 2 and the first pressure sensor is connected to the other end of valve 1, and the other end of valve 2 is left empty; the other end of the first pressure sensor is connected to one end of the second pressure sensor via valves 3 and 6, and also via valves 5 and 4; the connection points of valves 3 and 6, and valves 5 and 4 are respectively connected to the two ends of the differential pressure transmitter, and the two ends of the differential pressure transmitter are connected to the air inlet and outlet of the electronic expansion valve to be tested; the other end of the second pressure sensor is connected to one end of valve 7 and the stepping solenoid valve; the other end of valve 7 is left empty, and the other end of the stepping solenoid valve is connected to one end of valves 8 and 9, the other end of valve 8 is connected to the first flow meter, and the other end of valve 9 is connected to the second flow meter; The first flow meter has a flow rate of ml / min, and the second flow meter has a flow rate of L / min.

2. The comprehensive performance testing system for an electronic expansion valve as described in claim 1, characterized in that: The first flow meter has a range of 5~2000 ml / min, and the second flow meter has a range of 0.1~1000 L / min.

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