A PV test device for an accumulator

Abstract

The present invention belongs to the technical field of accumulators, and discloses a PV test device for an accumulator, which is used for the PV performance test of the accumulator to be tested. The device includes an oil tank mechanism, a medium tank mechanism, a test tank and a supercharger. A displacement sensor is installed on the supercharger. The accumulator to be tested is installed in the test tank. The oil tank mechanism is connected to a first pump mechanism through a first pipeline. The first pump mechanism is sequentially connected to a first check valve, a filter and a second pipeline. The second pipeline is connected to a servo valve, and the second pipeline is connected to the oil tank mechanism through an electromagnetic valve. The servo valve is connected to the oil inlet of the supercharger through a fifth pipeline. The servo valve is connected to the oil outlet of the supercharger through a sixth pipeline. The servo valve is connected to the oil tank mechanism through a seventh pipeline. The beneficial effects of the present invention are as follows: it reduces the labor intensity of workers, improves the test efficiency, and can improve the accuracy of the P-V performance test of the metal bellows accumulator.

Description

Technical Field

[0001] The present invention relates to the technical field of accumulators, and particularly to a PV testing device for an accumulator. Background Art

[0002] During the P-V performance test of the existing metal bellows accumulator, the detection method is that manual workers fill the metal bellows accumulator with special shock absorber oil through a syringe for filling and exhaust, and then press the special shock absorber oil into the metal bellows accumulator to be tested through a hand pump. The volume of the special shock absorber oil entering the metal bellows accumulator under the current pressure is calculated by the product of the displacement per stroke of the hand pump and the number of strokes, and the P-V performance curve of the metal bellows accumulator is manually drawn. This testing method has the following disadvantages: 1) When manually injecting the special shock absorber oil through a syringe, there is medium oil pollution and volatilization waste of the oil medium; 2) The number of strokes is counted manually, and there is an error in determining the number of strokes, which affects the accuracy of the V value; 3) Manually drawing the curve requires recording a large amount of pressure and volume data, which takes a long time; the labor intensity of manpower is large, the testing efficiency is low, and the testing accuracy is low; this problem of high labor intensity, low efficiency, and low accuracy needs to be solved urgently.

[0003] Therefore, it is necessary to provide a PV testing device for an accumulator to reduce the manual labor intensity, improve the testing efficiency, and improve the accuracy of the P-V performance test of the metal bellows accumulator. Summary of the Invention

[0004] The present invention discloses a PV testing device for an accumulator, which can effectively solve the technical problems involved in the background art.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A PV testing device for an accumulator, used for the PV performance test of the accumulator to be tested, includes an oil tank mechanism, a medium tank mechanism, a test tank, and a supercharger. A displacement sensor is installed on the supercharger, and the accumulator to be tested is installed in the test tank;

[0007] The oil tank mechanism is connected to a first pump mechanism through a first pipeline. The first pump mechanism is sequentially connected to a first one-way valve, a filter, and a second pipeline. The second pipeline is connected to a servo valve, and the second pipeline is connected to the oil tank mechanism through an electromagnetic valve. The servo valve is connected to the oil inlet of the supercharger through a fifth pipeline, the servo valve is connected to the oil outlet of the supercharger through a sixth pipeline, the servo valve is connected to the oil tank mechanism through a seventh pipeline, and a first pressure sensor is connected to the second pipeline;

[0008] The medium tank mechanism is connected to the second pump mechanism through Pipeline Eleven. The second pump mechanism is successively connected to a second one-way valve, a high-temperature solenoid valve, and the energy accumulator under test. A Pipeline Twelve is connected to the pipeline between the second one-way valve and the high-temperature solenoid valve. The Pipeline Twelve is connected to the medium tank mechanism. A regulating valve and a pressure measuring device are provided on the Pipeline Twelve. The energy accumulator under test is connected to a pneumatic control valve through Pipeline Ten. The pneumatic control valve is connected to the medium tank mechanism. A second pressure sensor is connected to Pipeline Ten;

[0009] The output end of the supercharger is connected in parallel with Pipeline Eight and Pipeline Nine. Both Pipeline Eight and Pipeline Nine are connected to Pipeline Ten. A first valve is provided on Pipeline Eight. Along the direction from the supercharger to Pipeline Ten, Pipeline Nine is successively provided with a second valve, a flowmeter, and a third valve.

[0010] As a preferred improvement of the present invention: A first oil suction filter and a copper ball valve are provided on Pipeline One.

[0011] As a preferred improvement of the present invention: A Pipeline Three is connected to the pipeline where the filter is connected to Pipeline Two. The Pipeline Three is connected to the fuel tank mechanism. A proportional overflow valve is provided on the Pipeline Three.

[0012] As a preferred improvement of the present invention: A Pipeline Four is connected to the pipeline where the first pump mechanism is connected to the first one-way valve. The Pipeline Four is connected to the fuel tank mechanism. A safety valve is provided on the Pipeline Four.

[0013] As a preferred improvement of the present invention: The PV test device of the energy accumulator further includes an oil cooling mechanism and an oil return filter. The oil cooling mechanism includes a chiller and an oil cooling pressure gauge. The chiller is connected to the oil return filter and is connected to the fuel tank mechanism. The oil cooling pressure gauge is provided on the pipeline where the chiller is connected to the oil return filter.

[0014] As a preferred improvement of the present invention: The fuel tank mechanism is connected to a first liquid level alarm device, a first liquid level gauge, a first temperature sensor, and a first air filter. The output end of the supercharger is connected to a second temperature sensor.

[0015] As a preferred improvement of the present invention: A first pressure gauge and an energy accumulator are connected to Pipeline Two. Energy accumulators are also connected to Pipeline Five and Pipeline Six. A second pressure gauge is connected to Pipeline Ten. The fuel tank mechanism is connected to a first drain valve. The medium tank mechanism is connected to a second drain valve.

[0016] As a preferred improvement of the present invention: A second oil suction filter and a fourth valve are provided on Pipeline Eleven. A third one-way valve is provided on the pipeline where the high-temperature solenoid valve is connected to the energy accumulator under test.

[0017] As a preferred improvement of the present invention: the medium tank mechanism is connected with a second liquid level alarm device, a second air filter, a fourth temperature sensor, a flange heating pipe and a second liquid level gauge, and a third temperature sensor is connected to the pipeline between the second one-way valve and the high-temperature solenoid valve.

[0018] As a preferred improvement of the present invention: the PV test device of the accumulator further includes an air source and a pressure-regulating filter oil mist separator, and the air source is connected to the pneumatic control valve through the pressure-regulating filter oil mist separator.

[0019] The beneficial effects of the present invention are as follows:

[0020] Provided is an automatic detection device for the P-V performance of a metal bellows accumulator, which can automatically detect the P-V performance of the metal bellows accumulator according to the parameters of the set test pressure and pressure rise rate, accurately detect the volume change of the metal bellows under a given pressure, automatically draw a P-V curve, reduce the labor intensity of manual work, improve the test efficiency, and improve the accuracy of the P-V performance test of the metal bellows accumulator. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings, where:

[0022] Figure 1 It is a schematic diagram of a PV test device for an accumulator of the present invention;

[0023] Figure 2 It is a structural diagram of a PV test device for an accumulator of the present invention;

[0024] Figure 3 It is a working flow chart of a PV test device for an accumulator of the present invention.

[0025] In the figure: 1 - fuel tank mechanism, 2 - medium tank mechanism, 3 - test tank, 4 - first oil suction filter, 5 - copper ball valve, 6 - first pump mechanism, 7 - first check valve, 8 - filter, 9 - servo valve, 10 - supercharger, 11 - solenoid valve, 12 - proportional relief valve, 13 - safety valve, 14 - oil cooling mechanism, 15 - return oil filter, 16 - first liquid level alarm device, 17 - first pressure gauge, 18 - first pressure sensor, 19 - first liquid level gauge, 20 - first temperature sensor, 21 - first air filter, 22 - second temperature sensor, 23 - second pressure gauge, 24 - second pressure sensor, 25 - flowmeter, 26 - first valve, 27 - second valve, 28 - third valve, 29 - second oil suction filter, 30 - fourth valve, 31 - second pump mechanism, 32 - second check valve, 33 - third temperature sensor, 34 - high-temperature solenoid valve, 35 - third check valve, 36 - pneumatic control valve, 37 - pressure-regulating filter oil mist separator, 38 - third pressure gauge, 39 - regulating valve, 40 - second liquid level alarm device, 41 - second air filter, 42 - fourth temperature sensor, 43 - flange heating pipe, 44 - second liquid level gauge, 45 - first drain valve, 46 - second drain valve, 101 - pipe one, 102 - pipe two, 103 - pipe three, 104 - pipe four, 105 - pipe five, 106 - pipe six, 107 - pipe seven, 108 - pipe eight, 109 - pipe nine, 110 - pipe ten, 111 - pipe eleven, 112 - pipe twelve. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0028] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] Please refer to Figure 1 As shown, the present invention provides a PV test device for an accumulator. Structures such as pumps, sensors, and pipelines are assembled in a box. Generally speaking, this device can be divided into a control system, a servo hydraulic system ( Figure 2 left part), a displacement method volume test system ( Figure 2 upper part), and a medium automatic filling and exhaust system ( Figure 2 right part). As an implementation manner, the control system includes an Advantech industrial computer, a Siemens PLC, Schneider electrical components, Labview software, etc., and controls various valves, motors, etc. of the system through the compiled Labview software program. The hydraulic drive system provides sufficient pressure and flow rate and supplies them to the servo directional valve, and precisely controls the pressure and flow rate of the servo directional valve through the Labview software in the control system. The displacement method volume test system includes a booster and a high-precision displacement sensor. The area A of the output end is calculated from the cylinder diameter at the output end of the booster. During the P-V performance test, when the oil pressure in the bellows accumulator shows an inflection point, the displacement L1 of the high-precision displacement sensor is captured. After reaching the working pressure, the displacement L2 of the high-precision displacement sensor is captured. The system automatically obtains the displacement difference △L, and at the same time automatically obtains the volume V of the medium entering the bellows accumulator, where V = △L × A. The medium automatic filling and exhaust system is used to provide the medium to the accumulator to be tested and achieve the automatic exhaust effect of the system.

[0032] Please refer to Figure 2As shown in the figure, the present invention provides a PV test device for an accumulator, which is used for the PV performance test of the accumulator to be tested. Specifically, it includes an oil tank mechanism 1, a medium tank mechanism 2, a test tank 3 and a supercharger 10. A displacement sensor is installed on the supercharger 10. The accumulator to be tested is installed in the test tank 3. The test tank 3 is a low-temperature environmental chamber, which provides a low-temperature environment for the accumulator to be tested. There is a tooling (such as a threaded pipe) in the test tank 3, and the accumulator to be tested is installed on the tooling. Multiple (2-4 or other quantities) accumulators to be tested can be installed in the test tank 3 to realize the test of multiple accumulators to be tested at one time. The oil tank mechanism 1 is used to store hydraulic oil, and the hydraulic oil is circulated to supply the supercharger 10 for the operation of the supercharger 10. The medium tank mechanism 2 is used to store media (such as water or gas), which is transported to the accumulator to be tested and used for the performance test of the accumulator to be tested. The supercharger 10 is used to pressurize the accumulator to be tested to complete the PV test process of the accumulator. A control system automatically detects the P-V performance of the metal bellows accumulator according to the parameters of the set test pressure and the pressure rise rate, can accurately detect the volume change of the metal bellows under a given pressure, and automatically draw the P-V curve.

[0033] The oil tank mechanism 1 is connected to the first pump mechanism 6 through a pipeline 101. The first pump mechanism 6 is sequentially connected to a first one-way valve 7, a filter 8 and a pipeline 102. The pipeline 102 is connected to a servo valve 9, and the pipeline 102 is connected to the oil tank mechanism 1 through a solenoid valve 11. The servo valve 9 is connected to the inlet of the supercharger 10 through a pipeline 105, the servo valve 9 is connected to the outlet of the supercharger 10 through a pipeline 106, the servo valve 9 is connected to the oil tank mechanism 1 through a pipeline 107, and a first pressure sensor 18 is connected to the pipeline 102. The first pump mechanism 6 provides power for the movement of the hydraulic oil. The servo valve 9 is used to control the flow direction of the hydraulic oil and has a pressure stabilizing effect. Valves such as the one-way valve 7 and the solenoid valve 11 are used for opening and closing the pipeline, and the hydraulic oil circulates in the pipeline and the supercharger 10.

[0034] The medium tank mechanism 2 is connected to the second pump mechanism 31 through Pipeline Eleven 111. The second pump mechanism 31 is successively connected to a second one-way valve 32, a high-temperature solenoid valve 34, and the energy accumulator to be measured. A Pipeline Twelve 112 is connected to the pipeline between the second one-way valve 32 and the high-temperature solenoid valve 34. The Pipeline Twelve 112 is connected to the medium tank mechanism 2. A regulating valve 39 and a pressure measuring device are provided on the Pipeline Twelve 112. The energy accumulator to be measured is connected to a pneumatic control valve 36 through Pipeline Ten 110. The pneumatic control valve 36 is connected to the medium tank mechanism 2. The Pipeline Ten 110 is connected to a second pressure sensor 24. The second pump mechanism 31 provides power for the flow of the medium in the medium tank mechanism 2. The medium is the medium required for the PV test of the energy accumulator to be measured. The second one-way valve 32 and the high-temperature solenoid valve 34 are used for opening and closing the pipeline. The pneumatic control valve 36 is used for deflation and pressure relief.

[0035] The output end of the supercharger 10 is connected in parallel with a Pipeline Eight 108 and a Pipeline Nine 109. Both the Pipeline Eight 108 and the Pipeline Nine 109 are connected to the Pipeline Ten 110. A first valve 26 is provided on the Pipeline Eight 108. The Pipeline Nine 109 is successively provided with a second valve 27, a flowmeter 25, and a third valve 28 along the direction from the supercharger 10 to the Pipeline Ten 110. The first valve 26, the second valve 27, and the third valve 28 can be structures such as ball valves.

[0036] As an implementation manner, a first oil suction filter 4 and a copper ball valve 5 are provided on the Pipeline One 101. A pipeline connecting the filter 8 and the Pipeline Two 102 is connected to a Pipeline Three 103. The Pipeline Three 103 is connected to the fuel tank mechanism 1. A proportional relief valve 12 is provided on the Pipeline Three 103. A Pipeline Four 104 is connected to the pipeline where the first pump mechanism 6 and the first one-way valve 7 are connected. The Pipeline Four 104 is connected to the fuel tank mechanism 1. A safety valve 13 is provided on the Pipeline Four 104. The PV test device of the energy accumulator further includes an oil cooling mechanism 14 and a return oil filter 15. The oil cooling mechanism 14 includes a chiller and an oil cooling pressure gauge. The chiller is connected to the return oil filter 15 and is connected to the fuel tank mechanism 1. An oil cooling pressure gauge is provided on the pipeline connecting the chiller and the return oil filter 15.

[0037] As an implementation manner, the fuel tank mechanism 1 is connected with a first liquid level alarm device 16, a first liquid level gauge 19, a first temperature sensor 20 and a first air filter 21, and the output end of the supercharger 10 is connected with a second temperature sensor 22. A first pressure gauge 17 and an accumulator are connected to the pipeline two 102, and accumulators are also connected to the pipeline five 105 and the pipeline six 106. The accumulator functions to stabilize pressure, flow rate, etc. A second pressure gauge 23 is connected to the pipeline ten 110, a first blowdown valve 45 is connected to the fuel tank mechanism 1, and a second blowdown valve 46 is connected to the medium tank mechanism 2. A second oil suction filter 29 and a fourth valve 30 are provided on the pipeline eleven 111, and a third one-way valve 35 is provided on the pipeline connecting the high-temperature solenoid valve 34 and the measured accumulator. The medium tank mechanism 2 is connected with a second liquid level alarm device 40, a second air filter 41, a fourth temperature sensor 42, a flange heating pipe 43 and a second liquid level gauge 44, and a third temperature sensor 33 is connected to the pipeline between the second one-way valve 32 and the high-temperature solenoid valve 34. The PV test device of the accumulator further includes a gas source and a pressure-regulating filter oil mist separator 37, and the gas source (5 - 7 bar compressed air, 3 / 8"NPTF) is connected to the pneumatic control valve 36 through the pressure-regulating filter oil mist separator 37. The pressure measuring device on the pipeline twelve 112 is a third pressure gauge 38, or it can also be a pressure sensor.

[0038] Specifically, the oil cooling mechanism 14 is mainly used for cooling the hydraulic oil in the fuel tank mechanism 1 of the hydraulic drive system. The first oil suction filter 4 ensures the cleanliness of the hydraulic oil entering the first pump mechanism 6. The filter 8 protects the servo valve 9, making the cleanliness of the hydraulic oil entering the servo valve 9 reach 5μm, ensuring that the servo valve 9 can work normally and well. The first pump mechanism 6 (oil pump, motor, etc.) provides a hydraulic power source for the hydraulic drive system. The pneumatic control valve 36 is used for exhausting air at the rear end during medium filling and also for relieving pressure after pressure boosting. The proportional overflow valve 12 proportionally adjusts the output pressure of the hydraulic drive system according to the set pressure. The DN32 hose is a buffer hose for the P and T ports of the servo valve 9. The pressure-regulating filter oil mist separator 37 provides control air for the pneumatic control valve 36. The high-temperature solenoid valve 34 closes when the medium temperature is high, enabling the medium tank to perform internal circulation heating. The air filter filters the breathing air when the liquid levels of the fuel tank mechanism 1 and the medium tank mechanism 2 fluctuate. The liquid level alarm device alarms when the high liquid level during filling is monitored in place and also alarms when the low liquid level is monitored in place during operation. The medium tank mechanism 2 provides a filling medium for the output end of the supercharger during the P-V performance test. The flange heating pipe 43 starts and heats when the medium temperature has a high-temperature requirement.

[0039] Specifically, the servo hydraulic system includes a hydraulic drive system (composed of the oil tank mechanism 1, the first oil suction filter 4, the copper ball valve 5, the first pump mechanism 6, the check valve 7, the filter 8, the proportional relief valve 12, the accumulator, the safety valve 13, the solenoid valve 11, the first pressure gauge 17, the first pressure sensor 18, etc.) and the servo valve 9. The hydraulic drive system provides sufficient pressure and flow to supply the servo valve 9. The automatic medium filling and exhaust system includes the medium tank mechanism 2, the second oil suction filter 29, the fourth valve 30 (ball valve), the second pump mechanism 31, the second check valve 32, the high-temperature solenoid valve 34, the third check valve 35, the air control valve 36, the pressure-regulating filter-oil mist collector 37, the third pressure gauge 38, and the regulating valve 39. Automatic exhaust is achieved by opening the second pump mechanism 31, the high-temperature solenoid valve 34, and the air control valve 36, and intermittently opening and closing the air control valve 36. The servo hydraulic system controls the speed of the booster 10 (cylinder with a high-precision displacement sensor) and the pressure within the metal bellows accumulator under test via the servo valve 9. The servo valve 9 forms a closed-loop feedback loop with the booster 10's displacement sensor and the pressure sensor of the metal bellows accumulator under test, thereby precisely controlling the displacement of the booster 10 and the rate of pressure rise within the metal bellows accumulator under test. The displacement-based volumetric testing system automatically calculates the volume entering the metal bellows accumulator under test by multiplying the displacement of the high-precision displacement sensor by the area of the booster 10's output end. The automatic medium filling and exhaust system is used to automatically fill and exhaust the medium within the metal bellows accumulator under test. This is accomplished through the second pump mechanism 31, the air control valve 36, and the rotary fixture. It should be noted that the use of other components to achieve the aforementioned effects falls within the inventive concept and scope of protection of this invention.

[0040] Working principle: The servo valve 9 controls the booster 10 according to the set pressure and boost rate. The product of the displacement of the high-precision displacement sensor and the area of the output end of the booster 10 is the volume entering the accumulator under test. The product of the total displacement and the area of the output end of the booster 10 is called the system and sample volume. The system volume is the volume of the metal bellows of the metal bellows accumulator under test that enters the accumulator under test before being compressed, that is, the volume of the metal bellows compressed under a certain pressure.

[0041] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the examples shown and described herein.

Claims

1. A PV test device for an accumulator, which is used for the PV performance test of the accumulator to be measured, is characterized in that: It includes a fuel tank mechanism (1), a medium tank mechanism (2), a test box (3) and a supercharger (10). A displacement sensor is installed on the supercharger (10), and the accumulator under test is installed in the test box (3). The fuel tank mechanism (1) is connected to a first pump mechanism (6) through a first pipeline (101). The first pump mechanism (6) is sequentially connected to a first one-way valve (7), a filter (8) and a second pipeline (102). The second pipeline (102) is connected to a servo valve (9), and the second pipeline (102) is connected to the fuel tank mechanism (1) through a solenoid valve (11). The servo valve (9) is connected to the oil inlet of the supercharger (10) through a fifth pipeline (105). The servo valve (9) is connected to the oil outlet of the supercharger (10) through a sixth pipeline (106). The servo valve (9) is connected to the fuel tank mechanism (1) through a seventh pipeline (107). A first pressure sensor (18) is connected to the second pipeline (102). The medium tank mechanism (2) is connected to a second pump mechanism (31) through an eleventh pipeline (111). The second pump mechanism (31) is sequentially connected to a second one-way valve (32), a high-temperature solenoid valve (34) and the accumulator under test. A twelfth pipeline (112) is connected to the pipeline between the second one-way valve (32) and the high-temperature solenoid valve (34). The twelfth pipeline (112) is connected to the medium tank mechanism (2). A regulating valve (39) and a pressure measuring device are provided on the twelfth pipeline (112). The accumulator under test is connected to a pneumatic control valve (36) through a tenth pipeline (110). The pneumatic control valve (36) is connected to the medium tank mechanism (2). A second pressure sensor (24) is connected to the tenth pipeline (110). The output end of the supercharger (10) is connected in parallel with an eighth pipeline (108) and a ninth pipeline (109). Both the eighth pipeline (108) and the ninth pipeline (109) are connected to the tenth pipeline (110). A first valve (26) is provided on the eighth pipeline (108). A second valve (27), a flowmeter (25) and a third valve (28) are sequentially provided on the ninth pipeline (109) along the direction from the supercharger (10) to the tenth pipeline (110).

2. The PV testing device for an accumulator according to claim 1, characterized in that: A first oil suction filter (4) and a copper ball valve (5) are provided on the first pipeline (101).

3. The PV test device for an accumulator according to claim 1, characterized in that: A third pipeline (103) is connected to the pipeline where the filter (8) is connected to the second pipeline (102). The third pipeline (103) is connected to the fuel tank mechanism (1). A proportional overflow valve (12) is provided on the third pipeline (103).

4. The PV testing device for an accumulator according to claim 1, characterized in that: A fourth pipeline (104) is connected to the pipeline where the first pump mechanism (6) is connected to the first one-way valve (7). The fourth pipeline (104) is connected to the fuel tank mechanism (1). A safety valve (13) is provided on the fourth pipeline (104).

5. The PV testing device for an accumulator according to claim 1, characterized in that: The PV test device of the accumulator further includes an oil cooling mechanism (14) and an oil return filter (15). The oil cooling mechanism (14) includes an oil chiller and an oil cooling pressure gauge. The oil chiller is connected to the oil return filter (15) and is connected to the fuel tank mechanism (1). The oil cooling pressure gauge is provided on the pipeline connecting the oil chiller and the oil return filter (15).

6. The PV testing device for an accumulator according to claim 1, characterized in that: The fuel tank mechanism (1) is connected with a first liquid level alarm device (16), a first liquid level gauge (19), a first temperature sensor (20) and a first air filter (21). The output end of the supercharger (10) is connected with a second temperature sensor (22).

7. The PV testing device for an accumulator according to claim 1, characterized in that: A first pressure gauge (17) and an accumulator are connected to the second pipeline (102). Accumulators are also connected to the fifth pipeline (105) and the sixth pipeline (106). A second pressure gauge (23) is connected to the tenth pipeline (110). The fuel tank mechanism (1) is connected with a first drain valve (45). The medium tank mechanism (2) is connected with a second drain valve (46).

8. The PV testing device for an accumulator according to claim 1, characterized in that: A second oil suction filter (29) and a fourth valve (30) are provided on the eleventh pipeline (111). A third one-way valve (35) is provided on the pipeline connecting the high-temperature solenoid valve (34) and the accumulator under test.

9. The PV testing device for an accumulator according to claim 1, characterized in that: The medium tank mechanism (2) is connected with a second liquid level alarm device (40), a second air filter (41), a fourth temperature sensor (42), a flange heating pipe (43) and a second liquid level gauge (44). A third temperature sensor (33) is connected to the pipeline between the second one-way valve (32) and the high-temperature solenoid valve (34).

10. The PV testing device for an accumulator according to claim 1, characterized in that: The PV test device of the accumulator further includes a gas source and a pressure regulating filter oil mist separator (37). The gas source is connected to the pneumatic control valve (36) through the pressure regulating filter oil mist separator (37).

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