A temperature differential pressure valve test device and test method

Abstract

The present invention belongs to the field of lubricating oil system testing, and particularly relates to a temperature differential valve testing device and a testing method. The traditional performance testing device for the temperature differential bypass valve only adopts a single cavity structure and cannot accurately measure. The valve performance testing device of the present invention adopts a two-cavity structure of an inner cavity and an outer cavity. The valve can fully sense the medium temperature of the inner cavity to open and close, and the accuracy of the measured temperature value is high, and the reliability and stability are good. Moreover, a steel bushing (or other wear-resistant materials) is installed on the mating end face of the housing and the valve in the testing device to reduce wear, extend the service life of the device and the repeated use of the device. In addition, the mating surface between the valve and the device adopts a surface clearance fit method to increase the force-bearing area, ensure no jamming during the guiding process, accurately measure the performance parameters, and uses a detachable self-locking nut for locking and fixing, with good maintainability.

Description

Technical Field

[0001] The present invention belongs to the field of lubricating oil system testing, and particularly relates to a temperature differential pressure valve testing device and a testing method, which can be applied to the performance testing of various temperature differential pressure bypass valves. Background Art

[0002] Heat exchangers are required to be equipped in aircraft engine lubricating oil, fuel, or other systems with heat exchange functions. As a key component of the heat exchanger, the temperature differential pressure bypass valve realizes the opening and closing of the bypass flow channel of the heat exchanger by sensing the change of the internal medium pressure or temperature of the heat exchanger. Due to the improvement of the heat balance distribution or the use efficiency of the aircraft system, the requirements for the opening and closing temperatures and leakage amounts of the temperature differential pressure bypass valve are becoming increasingly strict.

[0003] The traditional temperature differential pressure bypass valve performance testing device only adopts a single cavity structure, which not only cannot fully ensure the heat dissipation of the internal medium temperature and the ambient temperature, but also after the valve is closed, there is no medium around the temperature sensing element in the temperature sensing package, so the opening and closing temperatures of the valve cannot be accurately measured, and the testing is repeated. Moreover, the traditional valve structure mostly adopts a three-claw guiding structure, and the contact area with the device is small, which is easy to wear the device. During the testing process, repeated wear and jamming occur, and the performance parameters of the valve cannot be accurately measured. In addition, after the performance of the traditional valve structure is debugged and qualified, it is locked and fixed with an open pin or an S-pin, which damages the thread at the end of the temperature sensing element, resulting in poor maintainability of the valve. Summary of the Invention

[0004] The purpose of the present invention is: due to the improvement of the heat balance distribution or the use efficiency of the aircraft system, the requirements for the opening and closing temperatures and leakage amounts of the temperature differential pressure bypass valve are becoming increasingly strict. In order to accurately measure the opening and closing temperatures and leakage amounts of the temperature differential pressure bypass valve supporting heat exchanger products, the present invention provides a temperature differential pressure valve testing device and a testing method.

[0005] The temperature differential pressure valve testing device of the present invention includes a sealed and isolated inner housing and an outer housing. The inner housing has an inner cavity C2, and the space between the inner housing and the outer housing forms an outer cavity C1, where

[0006] The valve under test is sealed and installed in the inner housing. The inner housing has an oil inlet main pipeline, an oil outlet main pipeline, a first oil outlet bypass pipeline, and a second oil outlet bypass pipeline that communicate with the outside, and the first oil outlet bypass pipeline and the second oil outlet bypass pipeline communicate with the outlet of the valve under test;

[0007] The oil outlet main pipeline is connected to the outer housing through a return oil pipeline. During the test, the valve under test simultaneously senses the medium temperatures in the inner cavity C2 and the outer cavity C1.

[0008] Advantageously, an oil drain nozzle is installed on the outer housing.

[0009] Advantageously, a bushing is also installed between the valve under test and the inner housing.

[0010] Advantageously, a flowmeter and a pressure gauge are also provided on the oil path of the main oil inlet pipeline; flowmeters are provided on the oil paths of the first oil outlet bypass pipeline and the second oil outlet bypass pipeline.

[0011] Advantageously, valves are provided on the main oil outlet pipeline, the first oil outlet bypass pipeline and the second oil outlet bypass pipeline; flowmeters with different ranges are respectively installed on the first oil outlet bypass pipeline and the second oil outlet bypass pipeline.

[0012] Advantageously, both the inner housing and the outer housing are annular housings, and they are coaxially installed.

[0013] Advantageously, the valve under test is fixed by a detachable locking and fixing structure and locked by a self-locking nut.

[0014] The present invention also provides a temperature differential valve test method. Using the above test device, set the main oil inlet pipeline as the main oil inlet path A1, the main oil outlet pipeline as the main oil outlet path A2, the first oil outlet bypass pipeline as the oil outlet bypass A3, and the second oil outlet bypass pipeline as the oil outlet bypass A4. The test of the valve bypass flow includes:

[0015] Open the valves on the main oil inlet path A1 and the oil outlet bypass A3, and close the valves on the main oil outlet path A2 and the oil outlet bypass A4; introduce a medium with a specified temperature, pressure and flow rate from the main oil inlet path A1, heat the medium, and when the medium temperature reaches a certain specified value, record the lubricating oil flow rates at the main oil inlet path A1 and the oil outlet bypass A3, which are Q1 and Q2 respectively, and Q2 is the valve bypass flow.

[0016] Advantageously, the test of the valve start-to-close temperature includes:

[0017] Open the main oil inlet path A1, the main oil outlet path A2, and the oil outlet bypass A3, and close the valve on the oil outlet bypass A4. Heat the medium and observe the medium flow rate at the oil outlet bypass A3. When the medium flow rate at the oil outlet bypass A3 starts to decrease, record the medium temperature at this time as T1, and T1 is the valve start-to-close temperature.

[0018] Advantageously, when testing the valve fully-closed temperature, the opening differential pressure, and the valve leakage amount when the valve is fully closed, open the main oil inlet path A1, the main oil outlet path A2, and the oil outlet bypass A4, and close the valve on the oil outlet bypass A3, which respectively include:

[0019] Heat the medium and continue to observe the display of the G3 flowmeter of the medium flow rate at the oil outlet bypass A4. When the medium flow rate at the oil outlet bypass A4 does not change, record the medium temperature at this time as T2, and T2 is the valve fully-closed temperature;

[0020] Keep the medium temperature not lower than T2, slowly pressurize the medium, observe the medium flow rate G3 at the oil outlet bypass A4. When the medium flow rate at the oil outlet bypass A4 starts to increase, record the medium pressure at this time as P1, and P1 is the opening differential pressure.

[0021] Keep the medium temperature not lower than T2, slowly reduce the medium pressure to the required closing pressure, stabilize for 5 minutes, and record the medium flow rate at the oil outlet bypass A4 as Q3. Q3 is the leakage of the valve when the valve is fully closed.

[0022] The valve performance test device of the present invention adopts a two - chamber structure of an inner cavity and an outer cavity. The valve can fully sense the medium temperature in the inner cavity to open and close. The accuracy of the measured temperature value is high, and the reliability and stability are good. Moreover, a steel bushing or other wear - resistant materials are installed on the mating end face of the housing and the valve in the test device to reduce wear, extend the service life of the device and its repeated use. And the mating surface between the valve and the device adopts a surface clearance fit method to increase the contact area, ensure no jamming during the guiding process, accurately measure the performance parameters, and uses a detachable self - locking nut for locking and fixing, with good maintainability.

[0023] Beneficial effects:

[0024] 1) The design of the inner and outer two - chamber structure of the valve performance test device

[0025] The valve performance test device adopts a two - chamber structure of an inner cavity and an outer cavity. During the test, the outer cavity is filled with the medium through the return oil nozzle and works simultaneously with the main oil inlet path. The oil in the outer cavity and the oil in the main oil inlet path circulate simultaneously, and the oil temperatures are the same. One is to play a heat - preservation role, and the other is to ensure that when testing the valve performance, the outer end of the temperature - sensing element in the temperature - sensing package is filled with the medium, fully sensing the medium temperature and ensuring the accuracy of the test.

[0026] 2) The wear - resistant design of the mating end face of the test device housing and the valve

[0027] In the test device, a steel bushing or other wear - resistant materials are installed on the mating end face of the housing and the valve to reduce wear, extend the service life of the device and its repeated use.

[0028] 3) The design of the multi - bypass high - precision measurement structure

[0029] The test device has two bypass designs. Flow meters with different ranges are installed on the bypasses, which can meet the requirements of a large span of bypass flow rates when the valve is gradually closing during the process of increasing oil temperature. When the flow rate of the large - flow meter in the oil outlet bypass drops to zero, then open the valve of another oil outlet bypass for small - flow measurement. The measurement conversion is convenient and accurate.

[0030] 4) The design of the valve surface guiding structure

[0031] The valve structure adopts a valve face clearance guiding structure design, which increases the contact area with the device mating surface, reduces the wear of the device during testing, reduces jamming faults, and accurately measures the valve performance parameters.

[0032] 5) Design of the detachable locking and fixing structure of the valve

[0033] The new valve structure uses a self-locking nut for locking and fixing, which can be disassembled without damaging the thread at the end of the temperature sensing element, and has good maintainability.

[0034] 6) Design of high accuracy, consistency, and stability of the test device. Due to the two-chamber structure design of the test device, it has good heat preservation performance, and the temperature sensing element fully senses the medium, resulting in high test accuracy. In addition, the device is designed with enhanced wear resistance on the easily worn surfaces to ensure the consistency and stability of the measurement. Description of the drawings

[0035] Figure 1 Axial sectional view of the temperature differential valve test device of the present invention.

[0036] Among them, 1 - valve under test, 2 - inner housing, 3 - first oil outlet bypass pipeline, 4 - return oil pipeline, 5 - bushing, 6 - drain nozzle, 7 - outer housing, 8 - second oil outlet bypass pipeline, 9 - main oil inlet pipeline, 10 - main oil outlet pipeline - Flowmeter - Pressure gauge Detailed implementation manners

[0037] As Figure 1 shown in the embodiment, a temperature differential valve test device mainly includes a valve under test 1, an inner housing 2, a first oil outlet bypass pipeline 3, a return oil pipeline 4, a bushing 5, a drain nozzle 6, an outer housing 7, a second oil outlet bypass pipeline 8, a main oil inlet pipeline 9, and a main oil outlet pipeline 10. Among them, the valve under test 1 is sealed in the inner cavity C2 of the inner housing 2. The return oil pipeline 4 connects the main oil outlet pipeline 10 and the outer housing 7, and thus communicates with the outer cavity C1 between the outer housing 7 and the inner housing 2. The valve under test 1 senses the medium temperatures in the inner cavity C2 and the outer cavity C1 to open and close.

[0038] During testing, the outer cavity C1 is filled with the medium through the return oil pipeline 4. The oil temperature in the outer cavity C1 is the same as that in the main oil inlet pipeline 9. One is to play a heat preservation role, and the other is to ensure that when testing the valve performance, the outer end of the temperature sensing element is filled with the medium, fully senses the medium temperature, and ensures the accuracy of the test.

[0039] The test device includes a two-way bypass design: a first oil outlet bypass pipeline 3 and a second oil outlet bypass pipeline 8. Flowmeters with different ranges are installed on the bypasses, which can meet the needs of a large span of bypass flow when the valve gradually closes during the oil temperature rise process, and the measurement conversion is convenient and the measurement is accurate.

[0040] A bushing 5 made of steel or other wear-resistant materials is installed between the inner housing 2 and the valve 1 on the mating surface to reduce the wear of the measured valve 1 during the contact friction movement when it expands and contracts due to the change in the temperature of the medium, and to extend the service life and repeated use of the device. When installing the bushing 5, the clearance between the outer side surface of the bushing 5 and the mating end surface of the housing 2 is 0.05 mm to reduce the installation deformation when installing the steel bushing, and the clearance between the inner side surface of the bushing 5 and the valve is ensured to be 0.02 - 0.074 mm to ensure the accuracy of the leakage amount during the valve performance test. The measured valve 1 adopts a valve surface clearance guiding structure design to increase the contact area with the mating surface of the device, reduce the wear of the device during the test, reduce jamming faults, and accurately measure the valve performance parameters. The measured valve 1 adopts a detachable locking and fixing structure, which is locked and fixed by a self-locking nut without damaging the thread at the end of the temperature sensing element, and has good maintainability.

[0041] An oil discharge nozzle 6 is provided on the outer housing 7. The oil discharge nozzle 6 is in a closed state during the performance test of the valve 1, and after the test, it can discharge the working medium and clean the device.

[0042] Performance test principle of temperature and pressure differential valve

[0043] The main oil inlet pipeline 9 is set as the main oil inlet path A1, the main oil outlet pipeline 10 is set as the main oil outlet path A2, the first oil outlet bypass pipeline 3 is set as the oil outlet bypass A3, and the second oil outlet bypass pipeline 8 is set as the oil outlet bypass A4.

[0044] During the test, the outer cavity C1 is filled with the medium through the return oil pipeline 4 to ensure that the oil temperature in the outer cavity C1 is the same as that of the main path oil. The performance test device can be used to measure the bypass flow rate, the valve start closing temperature, the valve fully closing temperature, the opening pressure difference and the valve leakage amount of the same type of temperature and pressure sensing valves, specifically including:

[0045] a) Open the valves on the main oil inlet path A1 and the oil outlet bypass A3, and close the valves on the main oil outlet path A2 and the oil outlet bypass A4.

[0046] Introduce the medium with the specified temperature, pressure and flow rate from the main oil inlet path A1, heat the medium, and when the medium temperature is a certain specified value less than the start closing temperature, record the lubricating oil flow rates at the main oil inlet path A1 and the oil outlet bypass A3, which are Q1 and Q2 respectively, and Q2 is the valve bypass flow rate;

[0047] b) Open the main oil inlet path A1, the main oil outlet path A2, and the oil outlet bypass A3, and close the valve on the oil outlet bypass A4.

[0048] Heat the medium, observe the display of the medium flow rate G2 flowmeter at the oil outlet bypass A3, and when the medium flow rate at the oil outlet bypass A3 starts to decrease, record the medium temperature at this time as T1, and T1 is the valve start closing temperature;

[0049] c) Open the main inlet path A1, the main outlet path A2, and the outlet bypass path A4, and close the valve on the outlet bypass path A3.

[0050] ① Heat the medium, and continue to observe the display of the medium flow rate G3 flowmeter at the outlet bypass path A4. When the medium flow rate at the outlet bypass path A4 does not change, record the medium temperature at this time as T2, and T2 is the fully closed temperature of the valve.

[0051] ② Keep the medium temperature not lower than T2, slowly pressurize the medium, and observe the medium flow rate G3 at the outlet bypass path A4. When the medium flow rate at the outlet bypass path A4 starts to increase, record the medium pressure at this time as P1, and P1 is the opening differential pressure.

[0052] ③ Keep the medium temperature not lower than T2, slowly reduce the medium pressure to the required closing pressure, stabilize for 5 minutes, and record the medium flow rate at the outlet bypass path A4 as Q3, and Q3 is the valve leakage amount when the valve is fully closed.

Claims

1. A temperature differential pressure valve test device, characterized in that: The device includes a sealed and isolated inner housing (2) and an outer housing (7). The inner housing (2) has an inner cavity C2, and the space between the inner housing (2) and the outer housing (7) forms an outer cavity C1, where a valve under test (1) is sealed and installed in the inner housing (2). The inner housing (2) has an oil inlet main pipeline (9), an oil outlet main pipeline (10), a first oil outlet bypass pipeline (3) and a second oil outlet bypass pipeline (8) that communicate with the outside, and the first oil outlet bypass pipeline (3) and the second oil outlet bypass pipeline (8) communicate with the outlet of the valve under test (1); the oil outlet main pipeline (10) and the outer housing (7) are connected through an oil return pipeline (4). During the test, the valve under test (1) simultaneously senses the medium temperatures in the inner cavity C2 and the outer cavity C1.

2. The temperature differential pressure valve test device according to claim 1, characterized in that: An oil drain nozzle (6) is installed on the outer housing (7).

3. The temperature differential pressure valve test device according to claim 1, characterized in that: A bushing (5) is also installed between the valve under test (1) and the inner housing (2).

4. The temperature differential pressure valve test device according to claim 1, characterized in that: A flowmeter and a pressure gauge are also provided on the oil path of the oil inlet main pipeline (9); flowmeters are provided on the oil paths of the first oil outlet bypass pipeline (3) and the second oil outlet bypass pipeline (8), and flowmeters with different ranges are installed on the first oil outlet bypass pipeline (3) and the second oil outlet bypass pipeline (8) respectively.

5. The temperature differential pressure valve test device according to claim 4, characterized in that: Valves are provided on the oil outlet main pipeline (10), the first oil outlet bypass pipeline (3) and the second oil outlet bypass pipeline (8).

6. The temperature differential pressure valve test device according to claim 1, characterized in that: Both the inner housing (2) and the outer housing (7) are annular housings and are coaxially installed.

7. The temperature differential pressure valve test device according to claim 1, characterized in that: A detachable locking and fixing structure is used to fix the valve under test (1), and it is locked and fixed through a self-locking nut.

8. A temperature differential pressure valve test method, using the test device according to any one of claims 1-7, characterized in that: The oil inlet main pipeline (9) is set as the oil inlet main path A1, the oil outlet main pipeline (10) is set as the oil outlet main path A2, the first oil outlet bypass pipeline (3) is set as the oil outlet bypass A3, and the second oil outlet bypass pipeline (8) is set as the oil outlet bypass A4. The bypass flow of the test valve includes: Open the valves on the oil inlet main path A1 and the oil outlet bypass A3, and close the valves on the oil outlet main path A2 and the oil outlet bypass A4; introduce a medium with a specified temperature, pressure and flow rate from the oil inlet main path A1, heat the medium, and when the medium temperature reaches a certain specified value, record the lubricating oil flows at the oil inlet main path A1 and the oil outlet bypass A3, which are Q1 and Q2 respectively, and Q2 is the bypass flow of the valve.

9. The temperature differential pressure valve test method according to claim 8, characterized in that: The starting closing temperature of the test valve includes: Open the oil inlet main path A1, the oil outlet main path A2, and the oil outlet bypass A3, and close the valve on the oil outlet bypass A4, heat the medium, observe the medium flow at the oil outlet bypass A3, and when the medium flow at the oil outlet bypass A3 starts to decrease, record the medium temperature at this time as T1, and T1 is the starting closing temperature of the valve.

10. The temperature differential pressure valve test method according to claim 8, characterized in that: When testing the fully closed temperature of the test valve, the opening differential pressure and the valve leakage at full closure of the valve, open the oil inlet main path A1, the oil outlet main path A2, and the oil outlet bypass A4, and close the valve on the oil outlet bypass A3, respectively including: Heat the medium, continue to observe the medium flow at the oil outlet bypass A4, and when the medium flow at the oil outlet bypass A4 does not change, record the medium temperature at this time as T2, and T2 is the fully closed temperature of the valve; Keep the medium temperature not lower than T2, slowly pressurize the medium, observe the medium flow rate G3 at the oil outlet bypass A4. When the medium flow rate at the oil outlet bypass A4 starts to increase, record the medium pressure at this time as P1, and P1 is the opening differential pressure. Keep the medium temperature not lower than T2, slowly reduce the medium pressure to the required closing pressure, stabilize for 5 minutes, and record the medium flow rate at the oil outlet bypass A4 as Q3. Q3 is the valve leakage when the valve is fully closed.

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