Sealing ring leakage testing device used in high and low temperature environment

Abstract

The utility model provides a sealing ring leakage testing device used in high and low temperature environments, which comprises an oil tank, a motor pump and a plurality of testing oil cylinder assemblies, the testing oil cylinder assemblies are sequentially connected in parallel to the oil tank, and an oil inlet pipe close to one end of the oil tank is connected in series with the motor pump. The two ends of the oil cylinder are connected with a first oil inlet zero-leakage valve and a second oil inlet zero-leakage valve through oil inlet pipes respectively, the other end of the motor pump is connected with a servo proportional direction valve and a pipeline heater in series through the oil inlet pipes, and the pipeline heater is connected with one end of the first oil inlet zero-leakage valve and one end of the second oil inlet zero-leakage valve through the oil inlet pipes. The other end of the first oil inlet zero-leakage valve is connected with a first oil return zero-leakage valve in series through an oil return pipe, the other end of the second oil inlet zero-leakage valve is connected with a second oil return zero-leakage valve in series through an oil return pipe, and the other end of the first oil return zero-leakage valve and the other end of the second oil return zero-leakage valve are connected into the oil tank through the oil return pipe after being connected in parallel. According to the utility model, secondary heating of hydraulic oil is realized through the pipeline heater, and normal-temperature and high-temperature tests can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-temperature and high-pressure seal testing, and particularly relates to a seal ring leakage testing device for high and low temperature environments. Background Art

[0002] A seal leakage testing device under high and low temperature environments is a device for respectively testing the leakage conditions of seal rings under high pressure (35 MPa) and high and low temperatures (room temperature to 150 °C). When testing the seal ring leakage, the seal ring needs to be installed on the piston of the oil cylinder for testing.

[0003] At present, the leakage test of the seal ring is only carried out at room temperature or below 80 °C. When testing at a high temperature of 150 °C, since the oil temperature is higher than 80 °C, conventional oil pumps and hydraulic valves cannot meet the requirements, and the solenoid valve needs to be a zero-leakage valve and a high-temperature-resistant valve. Otherwise, the measurement of the leakage amount is inaccurate, and the heating and temperature control of the hydraulic oil will directly affect the test cost and test quality.

[0004] Content of the utility model

[0005] In order to solve the above technical problems, the purpose of the utility model is to provide a seal ring leakage testing device for high and low temperature environments, which realizes secondary heating of the hydraulic oil by connecting a pipeline heater in series on the oil path of the test oil cylinder assembly. Therefore, high-temperature-resistant oil pumps and hydraulic valve assemblies are not required, and the requirements of both normal temperature and high temperature tests are met at the same time.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A seal ring leakage testing device for high and low temperature environments includes an oil tank, a motor pump, and a plurality of test oil cylinder assemblies. The plurality of test oil cylinder assemblies are connected in parallel to the oil tank in sequence. The oil tank is connected to one of the test oil cylinder assemblies through an inlet pipe and an outlet pipe. The motor pump is connected in series on the inlet pipe near one end of the oil tank. The test oil cylinder assembly includes an oil cylinder, a servo proportional direction valve, a first inlet zero-leakage valve, a second inlet zero-leakage valve, a first return zero-leakage valve, a second return zero-leakage valve, and a pipeline heater. Both ends of the oil cylinder are respectively connected to the first inlet zero-leakage valve and the second inlet zero-leakage valve through an inlet pipe. The other end of the motor pump is connected in series to the servo proportional direction valve and the pipeline heater through an inlet pipe in sequence. The pipeline heater is connected to one end of the first inlet zero-leakage valve and one end of the second inlet zero-leakage valve through an inlet pipe. The other end of the first inlet zero-leakage valve is connected in series with a first return zero-leakage valve through a return pipe. The other end of the second inlet zero-leakage valve is connected in series with a second return zero-leakage valve through a return pipe. The other ends of the first return zero-leakage valve and the second return zero-leakage valve are connected in parallel and then connected to the oil tank through a return pipe.

[0008] Further, a sheathed heater is arranged inside the fuel tank, and a self-circulating cooler is connected to the fuel tank.

[0009] Further, the test oil cylinder assembly further includes a pressure reducing valve, a needle valve, a pressure gauge, a check valve, a third oil return zero-leakage valve and a flow meter. The pressure reducing valve is connected in series on the oil inlet pipe between the motor pump and the servo proportional direction valve. The needle valve is connected in series on the oil inlet pipe between the servo proportional direction valve and the pipeline heater. One end of the needle valve is connected to the pressure gauge. The third oil return zero-leakage valve, the flow meter and the check valve are connected in series in sequence on the oil return pipe between the first oil return zero-leakage valve and the second oil return zero-leakage valve and the fuel tank.

[0010] Further, an oil pipe filter is connected in series on the oil inlet pipe between the motor pump and the pressure reducing valve, and a high-pressure ball valve is further connected in series on the oil inlet pipe between the oil pipe filter and the pressure reducing valve.

[0011] Further, an oil return filter is connected in series on the oil outlet pipe near one end of the fuel tank.

[0012] Further, a drain ball valve, an oil level gauge, an oil inlet filter, a liquid level switch, an oil temperature sensor and an air filter are further arranged on the fuel tank. The oil inlet filter is connected to the end of the oil inlet pipe, and the drain ball valve is connected to the bottom of the fuel tank.

[0013] Further, a second oil inlet pipe is connected to the oil inlet pipe between the high-pressure ball valve and the oil pipe filter, and a second oil return pipe is connected to the oil return pipe between the oil return filter and the check valve. The second oil inlet pipe and the second oil return pipe are connected to the remaining test oil cylinder assemblies.

[0014] Further, the second oil return pipe is connected to the oil inlet pipe, and a proportional overflow valve is connected in series between the second oil return pipe and the oil inlet pipe.

[0015] Due to the adoption of the above technical solutions, the utility model has the following advantages and effects:

[0016] A sealing leakage test device under high and low temperature environments provided by the utility model realizes secondary heating of hydraulic oil by connecting a pipeline heater in series on the oil path of the test oil cylinder assembly. Therefore, there is no need for high-temperature resistant oil pumps and hydraulic valve assemblies, and the normal temperature and high temperature test requirements can be met at the same time. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of the utility model.

[0018] The reference numerals are as follows: 1 - oil drain ball valve; 2 - oil tank; 3 - oil level gauge; 4 - sheathed heater; 5 - inlet oil filter; 6 - liquid level switch; 7 - oil temperature sensor; 8 - air filter; 9 - self - circulating cooler; 10 - return oil filter; 11 - motor pump; 12 - oil pipe filter; 13 - proportional overflow valve; 14 - high - pressure ball valve; 15 - pressure reducing valve; 16 - servo - proportional direction valve; 17 - pressure gauge adapter; 18 - needle valve; 19 - pressure gauge; 20 - pipeline heater; 21 - first return oil zero - leakage valve; 211 - second return oil zero - leakage valve; 22 - first inlet oil zero - leakage valve; 221 - second inlet oil zero - leakage valve; 23 - first quick - change joint; 231 - second quick - change joint; 24 - oil cylinder; 25 - third return oil zero - leakage valve 25; 26 - flowmeter; 27 - check valve. Detailed implementation mode

[0019] The embodiments of the present utility model will be described in detail below in conjunction with the drawings, so as to more clearly understand the purpose, features and advantages of the present utility model. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present utility model, but only to illustrate the essential spirit of the technical solution of the present utility model.

[0020] As Figure 1 shown. The present utility model provides a seal leakage test device for high - and low - temperature environments, including an oil tank 2, a motor pump 11 and a number of test oil cylinder assemblies. The number of test oil cylinder assemblies are connected in parallel to the oil tank 2 in sequence, and the test seals are installed on the test oil cylinder assemblies. The motor pump 11 is connected in series on the inlet oil pipe near one end of the oil tank 2, and the oil tank 2 is connected to one of the test oil cylinder assemblies through the inlet oil pipe and the outlet oil pipe. Each test oil cylinder assembly includes an oil cylinder 24, a servo - proportional direction valve 16, a first inlet oil zero - leakage valve 22, a second inlet oil zero - leakage valve 221, a first return oil zero - leakage valve 21, a second return oil zero - leakage valve 211 and a pipeline heater 20. Both ends of the oil cylinder 24 are respectively connected to the first inlet oil zero - leakage valve 22 and the second inlet oil zero - leakage valve 221 through the inlet oil pipe. The other end of the motor pump 11 is connected in series to the servo - proportional direction valve 16 and the pipeline heater 20 in sequence through the inlet oil pipe. The pipeline heater 20 is connected to one end of the first inlet oil zero - leakage valve 22 and one end of the second inlet oil zero - leakage valve 221 through the inlet oil pipe. The other end of the first inlet oil zero - leakage valve 22 is connected in series with a first return oil zero - leakage valve 21 through the return oil pipe. The other end of the second inlet oil zero - leakage valve 221 is connected in series with a second return oil zero - leakage valve 211 through the return oil pipe. The other ends of the first return oil zero - leakage valve 21 and the second return oil zero - leakage valve 211 are connected in parallel and then connected to the oil tank 2 through the return oil pipe.

[0021] Specifically, since the sealing ring needs to be installed on the oil cylinder piston of the test oil cylinder assembly to test the leakage of the seal, considering the convenience of disassembly and assembly of the oil cylinder under high-temperature conditions, the two oil inlet and outlet ports of the test oil cylinder assembly are respectively connected with a first quick-change joint 23 and a second quick-change joint 231. One end of the first quick-change joint 23 is communicated with the first oil return zero-leakage valve 21 and the first oil inlet zero-leakage valve 22, and one end of the second quick-change joint 231 is communicated with the second oil inlet zero-leakage valve 221 and the second oil return zero-leakage valve 211. The first quick-change joint 23 and the second quick-change joint 231 are quick-install joints, which can quickly connect the test oil cylinder assembly. The servo proportional direction valve 16 is used to adjust the hydraulic oil flow rate in the oil inlet pipe.

[0022] The pipeline heater 20 of the present utility model comprises a heating pipe, a circulation pump and a heating cavity. The heating pipe is a spiral pipeline, which is formed by surrounding a seamless steel pipe that can withstand 35 MPa. The heating pipe is axially nested in the heating cavity, and the heating cavity is filled with circulating external heating hydraulic oil, and the heating hydraulic oil is provided by an oil mold temperature machine. One end of the circulation pump is connected to one end of the heating pipe, and the other end is connected to the oil tank 2. The other end of the heating pipe is connected to the oil tank 2. The circulation pump extracts the hydraulic oil in the oil tank 2 into the heating pipe for internal circulation, and the circulating heating liquid heats the heating pipe in the heating cavity, and the heating pipe transfers the heat to the internal hydraulic oil, realizing the external circulation heating of the hydraulic oil in the oil tank 2.

[0023] The test oil cylinder assembly of the present utility model comprises a first test oil cylinder assembly and a second test oil cylinder assembly. The first test oil cylinder assembly and the second test oil cylinder assembly are connected in parallel to the oil return pipe and the oil inlet pipe. The first test oil cylinder assembly and the second test oil cylinder assembly share a motor pump 11, and the motor pump 11 provides the oil pressure power for the actions of the first test oil cylinder assembly and the second test oil cylinder assembly.

[0024] Furthermore, the test oil cylinder assembly further comprises a pressure reducing valve 15, a needle valve 18, a pressure gauge 19, a check valve 24, a third oil return zero-leakage valve 25 and a flow meter 26. A pressure reducing valve 15 is connected in series on the oil inlet pipe between the motor pump 11 and the servo proportional direction valve 16, and a needle valve 18 is connected in series on the oil inlet pipe between the servo proportional direction valve 16 and the pipeline heater 20. One end of the needle valve 18 is connected to the pressure gauge 19, and the needle valve 18 is installed on the pressure gauge joint 17, and the pressure gauge joint 17 is connected in series on the oil inlet pipe. A third oil return zero-leakage valve 25, a flow meter 26 and a check valve 27 are connected in series in sequence on the oil return pipe between the first oil return zero-leakage valve 21 and the second oil return zero-leakage valve 211 and the oil tank 2.

[0025] Furthermore, an oil pipe filter 12 is connected in series on the oil inlet pipe between the motor pump 11 and the pressure reducing valve 15. A high-pressure ball valve 14 is also connected in series on the oil inlet pipe between the oil pipe filter 12 and the pressure reducing valve 15. The oil pipe filter 12 is used to remove solid impurities in the hydraulic oil in the oil inlet pipe.

[0026] Further, an oil return filter 10 is connected in series on the oil outlet pipe near one end of the fuel tank 2. One end of the oil return filter 10 is connected into the fuel tank 2 through an oil return pipe, and the oil return filter 10 is used to filter impurities in the oil return circuit.

[0027] Further, an oil drain ball valve 1, an oil level gauge 3, an oil inlet filter 5, a liquid level switch 6, an oil temperature sensor 7 and an air filter 8 are also arranged on the fuel tank 2. The oil inlet filter 5 is arranged inside the fuel tank 2 and connected to the end of the oil inlet pipe. The oil drain ball valve 1 is connected to the bottom of the fuel tank 2 for draining oil.

[0028] Specifically, the liquid level switch 6 and the oil level gauge 3 are used for monitoring the oil level of the fuel tank 2. The oil temperature sensor 7 is used for monitoring the temperature of the hydraulic oil inside the fuel tank 2. The air filter 8 is used for filtering the air entering the fuel tank 2. The oil level gauge 3 and the oil temperature sensor 7 can issue alarms while automatically detecting. When the temperature exceeds the preset value or the liquid level exceeds the preset value, the oil level gauge 3 and the oil temperature sensor 7 will trigger an alarm signal.

[0029] Further, in order to heat the hydraulic oil in the fuel tank 2, a sheathed heater 4 is arranged inside the fuel tank 2 to heat the hydraulic oil in the fuel tank 2 through the sheathed heater 4. The sheathed heater 4 is composed of a heating core and an outer sheath. The heating core uses a high-temperature-resistant alloy electric heating wire as the heat source, and the outer sheath uses a cold-drawn seamless steel pipe. When an electric current passes through the electric heating wire of the heating core, due to the effect of resistance, the electric heating wire will generate heat, and the heat is conducted to the hydraulic oil through the sheath, thereby increasing the temperature of the hydraulic oil.

[0030] Further, since the tested cylinder 24 has a high temperature and needs to be cooled, and the untested cylinder 24 is installed with a sealing ring waiting to be tested, in order to save the cooling time of the cylinder 24 and ensure that the temperature of the hydraulic oil in the fuel tank 2 is below 80°, a self-circulation cooler 9 is installed on the fuel tank 2 to cool the hydraulic oil in the fuel tank 2.

[0031] The self-circulation cooler includes a hydraulic oil pump and an air cooler. After the filtered hydraulic oil is pumped out from the fuel tank 2 by the hydraulic oil pump, it is cooled by the air cooler and then returned to the fuel tank 2. It operates continuously like this to filter and cool the hydraulic oil in the fuel tank 2 to the required temperature. The temperature inside the fuel tank is detected by the oil temperature sensor. When it reaches the set temperature, an electric signal is sent to stop the motors of the hydraulic oil pump and the air cooler of the self-circulation cooler.

[0032] Further, a second inlet pipe is connected to the inlet pipe between the high-pressure ball valve 14 and the oil pipe filter 12, and a second return pipe is connected to the return pipe between the return oil filter 10 and the check valve 27. The second inlet pipe and the second return pipe are connected to the remaining test cylinder assemblies. In the present utility model, the second inlet pipe and the second return pipe are connected to the second test cylinder assembly. By controlling the high-pressure ball valve 14, the connection between the motor pump 11 and the first test cylinder assembly or the second test cylinder assembly can be switched to realize the actions of different test cylinder assemblies.

[0033] According to this connection method, multiple cylinder test assemblies can be connected in parallel at the same time for the simultaneous test of multiple sealing rings.

[0034] Further, the second return pipe is connected to the inlet pipe, and a proportional overflow valve 13 is connected in series between the second return pipe and the inlet pipe. The hydraulic oil pressure entering the second test cylinder assembly can be adjusted through the proportional overflow valve 13.

[0035] When the present utility model is in use, the leakage of the sealing rings at normal temperature and high temperature can be tested simultaneously on the same device. During the normal temperature test, the oil tank 2 and the pipeline heater 20 do not need to be heated, and the test can be carried out directly.

[0036] During the high temperature test, the temperature of the hydraulic oil is heated in two steps. First, the hydraulic oil is heated to 80 °C in the oil tank 2 by the sheathed heater 4. When the hydraulic oil is pumped out by the motor pump 11 to the proportional overflow valve 13, the pressure reducing valve 15 and the servo proportional direction valve 16, its temperature does not exceed 80 °C, and then it is heated to 150 °C by the pipeline heater 20 and finally enters the test cylinder assembly. In this way, the motor pump 11 and the servo proportional direction valve 16 do not need to be specially ordered for high temperature valves and high temperature pumps, which can save costs.

[0037] When the cylinder 24 of the test cylinder assembly of the present utility model acts, taking the first test cylinder assembly as an example, the two-way action of the cylinder 24 is realized by controlling the first inlet zero-leakage valve 22, the second inlet zero-leakage valve 221, the first return zero-leakage valve 21 and the second return zero-leakage valve 211. When the cylinder 24 moves to the left, the direction of the hydraulic oil is through the pipeline heater 20, the second return zero-leakage valve 211, the second quick-change joint 231, the first quick-change joint 23, the first return zero-leakage valve 21, and the return oil filter 10 back to the oil tank 2. When the cylinder 24 moves to the right, the direction of the hydraulic oil is through the pipeline heater 20, the first inlet zero-leakage valve 22, the first quick-change joint 23, the second quick-change joint 231, the second return zero-leakage valve 211, and the return oil filter 10 back to the oil tank 2.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A sealing ring leakage test device for high and low temperature environments, characterized in that: The invention comprises an oil tank (2), a motor pump (11) and a plurality of test oil cylinder assemblies, wherein the plurality of test oil cylinder assemblies are sequentially connected in parallel to the oil tank (2), the oil tank (2) is connected to one of the test oil cylinder assemblies via an oil inlet pipe and an oil outlet pipe, the motor pump is connected in series to the oil inlet pipe near one end of the oil tank (2), the test oil cylinder assembly comprises an oil cylinder (24), a servo proportional directional valve (16), a first oil inlet zero leakage valve (22), a second oil inlet zero leakage valve (221), a first oil return zero leakage valve (21), a second oil return zero leakage valve (211) and a pipeline heater (20), and the two ends of the oil cylinder (24) are respectively connected to the first oil inlet zero leakage valve (22) and the second oil inlet zero leakage valve (211) via the oil inlet pipe. The motor pump (11) is connected to a servo proportional directional valve (16) and a pipe heater (20) in series in sequence through an oil inlet pipe. The pipe heater (20) is connected to one end of the first oil inlet zero leakage valve (22) and one end of the second oil inlet zero leakage valve (221) through an oil inlet pipe. The other end of the first oil inlet zero leakage valve (22) is connected to a first oil return zero leakage valve (21) through an oil return pipe. The other end of the second oil inlet zero leakage valve (221) is connected to a second oil return zero leakage valve (211) through an oil return pipe. The other end of the first oil return zero leakage valve (21) and the other end of the second oil return zero leakage valve (211) are connected in parallel and then connected to the oil tank (2) through the oil return pipe.

2. The sealing ring leakage testing device for high and low temperature environments according to claim 1, characterized in that: A sheath-type heater (4) is arranged in the oil tank (2), and a self-circulating cooler (9) is connected to the oil tank (2).

3. A sealing ring leakage testing device for use in high and low temperature environments according to claim 1 or 2, characterized in that: The test cylinder assembly further comprises a pressure reducing valve (15), a needle valve (18), a pressure gauge (19), a one-way valve (27), a third oil return zero leakage valve (25) and a flow meter (26); the pressure reducing valve (15) is connected in series to the oil inlet pipe between the motor pump (11) and the servo proportional directional valve (16); the needle valve (18) is connected in series to the oil inlet pipe between the servo proportional directional valve (16) and the pipeline heater (20); one end of the needle valve (18) is connected to the pressure gauge (19); the third oil return zero leakage valve (25), the flow meter (26) and the one-way valve (27) are connected in series to the oil return pipe between the first oil return zero leakage valve (21) and the second oil return zero leakage valve (211) and the oil tank (2) in sequence.

4. The sealing ring leakage testing device for high and low temperature environments according to claim 3 is characterized in that: An oil pipe filter (12) is serially connected to the oil inlet pipe between the motor pump (11) and the pressure reducing valve (15), and a high-pressure ball valve (14) is also serially connected to the oil inlet pipe between the oil pipe filter (12) and the pressure reducing valve (15).

5. The sealing ring leakage testing device for high and low temperature environments according to claim 4, characterized in that: An oil return filter (10) is serially connected to the oil outlet pipe near one end of the oil tank (2).

6. The sealing ring leakage testing device for high and low temperature environments according to claim 5, characterized in that: The oil tank (2) is also provided with an oil drain ball valve (1), an oil level gauge (3), an oil inlet filter (5), a liquid level switch (6), an oil temperature sensor (7) and an air filter (8); the oil inlet filter (5) is connected to the end of the oil inlet pipe, and the oil drain ball valve (1) is connected to the bottom of the oil tank (2).

7. The sealing ring leakage testing device for high and low temperature environments according to claim 6, characterized in that: A second oil inlet pipe is connected to the oil inlet pipe between the high-pressure ball valve (14) and the oil pipe filter (12), and a second oil return pipe is connected to the oil return pipe between the oil return filter (10) and the one-way valve (27). The second oil inlet pipe and the second oil return pipe are connected to the rest of the test cylinder assembly.

8. The sealing ring leakage testing device for high and low temperature environments according to claim 7, characterized in that: The second oil return pipe is connected to the oil inlet pipe, and a proportional overflow valve (13) is connected in series between the second oil return pipe and the oil inlet pipe.

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