A plunger pump testing device

Abstract

This utility model relates to the technical field of plunger pump safety testing equipment, specifically to a plunger pump testing device. It includes a testing platform with a motor and a clamping mechanism. An oil tank and a control cabinet are located on one side of the testing platform. The oil tank is connected to an oil pipe via a control valve. The control cabinet contains a first oil outlet pipe and a second oil outlet pipe. One end of the first oil outlet pipe extends to the testing platform, and the other end is connected to a direct-acting relief valve. A flow sensor and a temperature sensor are also installed on the first oil outlet pipe. One end of the second oil outlet pipe is connected to the direct-acting relief valve, and the other end is connected to the oil tank. A pressure sensor is also installed on the second oil outlet pipe. The control cabinet also contains a load-sensitive feedback pipe, one end of which extends to the testing platform, and the other end is connected to the first oil outlet pipe via a solenoid valve. A drain pipe is also located inside the control cabinet. This utility model not only accurately detects the sealing performance of the plunger pump but also improves testing efficiency and saves testing costs.

Description

Technical Field

[0001] This utility model relates to the technical field of plunger pump safety testing equipment, specifically to a plunger pump testing device. Background Technology

[0002] A piston pump is an important hydraulic component, primarily used in hydraulic systems. It achieves fluid intake and discharge through the reciprocating motion of a piston within a cylinder. It features a compact structure, small size, high rated pressure, high-precision fit, high efficiency, and ease of installation and maintenance. It is widely used in high-pressure, high-flow-rate applications and where flow regulation is required, such as hydraulic presses, engineering, shipbuilding, and mining machinery. Damage is inevitable during use. To ensure the normal operation of the piston pump, it is necessary to repair it and perform an airtightness test.

[0003] To ensure the proper functioning of piston pumps after additive manufacturing repairs, airtightness tests are required at multiple repair weld points before the pump leaves the factory or after repair. The flow rate of the entire piston pump under operating pressure is also checked. Existing piston pump airtightness testing devices are relatively complex to operate. The test requires blocking the pump's inlet and outlet ports, introducing high-pressure gas into the pump, and then placing the pump in a water tank to observe for bubbles. However, this method has significant drawbacks. For example, if a leak occurs, external water can enter the pump, causing damage and increasing subsequent repair costs. Furthermore, current testing of piston pump suction and discharge flow rate performance largely relies on actual operational conditions, which cannot accurately determine the inlet and outlet oil flow rates. Alternatively, the pump's suction and discharge accuracy can be indirectly tested by weighing the discharged liquid using an electronic scale and then calculating the suction and discharge volume. However, such indirect methods cannot accurately and intuitively demonstrate the pump's suction and discharge accuracy and are easily affected by environmental interference.

[0004] It is evident that existing plunger pump testing devices cannot efficiently and accurately detect the airtightness of plunger pump suction and discharge performance and the flow rate under working pressure, resulting in low testing efficiency and being time-consuming and labor-intensive. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides a plunger pump testing device that can not only accurately test the sealing performance of the plunger pump, but also improve testing efficiency and save testing costs.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a plunger pump testing device, comprising a test platform, a motor and a clamping mechanism on the test platform, an oil tank and a control cabinet on one side of the test platform, an oil tank connected to an oil pipe via a control valve, a first oil outlet pipe and a second oil outlet pipe inside the control cabinet, one end of the first oil outlet pipe extending to the test platform and the other end connected to a direct-acting relief valve, a flow sensor and a temperature sensor also being provided on the first oil outlet pipe, one end of the second oil outlet pipe connected to the direct-acting relief valve and the other end connected to the oil tank, a pressure sensor also being provided on the second oil outlet pipe, a load-sensitive feedback tube inside the control cabinet, one end of the load-sensitive feedback tube extending to the test platform and the other end connected to the first oil outlet pipe via a solenoid valve, a drain pipe inside the control cabinet, one end of the drain pipe extending to the test platform and the other end connected to the oil tank, a flow sensor also being provided on the drain pipe.

[0007] As a further embodiment of this utility model: the output end of the motor is connected to an elastic coupling, the elastic coupling being shaped like a plum blossom; the clamping mechanism includes a first support plate and a second support plate, both the first and second support plates having through holes in their centers; the bottom of the first support plate being fixedly connected to the test platform; the elastic coupling passing through the through hole of the first support plate; the bottom of the second support plate being slidably connected to the test platform via a slide rail; and threaded holes being provided on both the first and second support plates for mounting the plunger pump.

[0008] As a further improvement of this utility model: the top of the oil tank is provided with an oil return filter, which is connected to the second oil outlet pipe and the drain pipe through a three-way connector.

[0009] As a further embodiment of this utility model: a pressure gauge, a temperature display and a flow meter are provided on the outside of the control cabinet. The pressure gauge is connected to the pressure sensor through a pressure guide tube, and the temperature display and the flow meter are respectively connected to the temperature sensor and the flow sensor through induction wires.

[0010] As a further improvement of this utility model: the control cabinet is also equipped with a step-down device, which is connected to a solenoid valve.

[0011] As a further improvement of this utility model: the control cabinet is also equipped with a spare direct-acting overflow valve, which is connected to the first oil outlet pipe.

[0012] As a further improvement of this utility model: a motor control box is provided on one side of the test platform, the motor control box is connected to the motor, and a control switch is provided on the motor control box.

[0013] As a further improvement of this utility model, the control cabinet is also equipped with a selector switch and an emergency stop switch.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This utility model's plunger pump testing device can perform sealing tests on the plunger pump's inlet cavity, outlet cavity, and cylinder, as well as flow rate tests under working pressure. It can also accurately determine whether the plunger pump's airtightness is up to standard, and will not damage the plunger pump during the testing process. In addition to being accurate, it also has the characteristics of high testing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the plunger pump testing device of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the control cabinet of the plunger pump testing device of this utility model;

[0018] Figure 3 This is a top view of the plunger pump testing device of this utility model;

[0019] In the diagram: 1. Test platform; 2. Motor; 3. Clamping mechanism; 31. First support plate; 32. Second support plate; 33. Through hole; 34. Threaded hole; 4. Oil tank; 5. Control cabinet; 6. Control valve; 7. Oil pipe; 8. First oil outlet pipe; 9. Second oil outlet pipe; 10. Direct-acting relief valve; 11. Flow sensor; 12. Temperature sensor; 13. Pressure sensor; 14. Load-sensitive feedback tube; 15. Solenoid valve; 16. Drain pipe; 17. Flexible coupling; 18. Slide rail; 19. Return oil filter; 20. T-joint; 21. Pressure gauge; 22. Temperature display; 23. Flow meter; 24. Pressure guide pipe; 25. Pressure reducer; 26. Spare direct-acting relief valve; 27. Motor control box; 28. Control switch. Detailed Implementation

[0020] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer and easier to understand, the technical solutions in the embodiments of this utility model are clearly and completely described below with reference to the accompanying drawings. However, the described embodiments are only some embodiments of this utility model and are not included in all embodiments. Any modifications, equivalent substitutions, and changes made within the spirit and principles of this utility model should be included within its scope.

[0021] refer to Figures 1 to 3A plunger pump testing device includes a test platform 1, on which a motor 2 and a clamping mechanism 3 are mounted. An oil tank 4 and a control cabinet 5 are located on one side of the test platform 1. The oil tank 4 is connected to an oil pipe 7 via a control valve 6. The control cabinet 5 contains a first oil outlet pipe 8 and a second oil outlet pipe 9. One end of the first oil outlet pipe 8 extends to the test platform 1, and the other end is connected to a direct-acting relief valve 10. A flow sensor 11 and a temperature sensor 12 are also mounted on the first oil outlet pipe 8. One end of the second oil outlet pipe 9 is connected to the direct-acting relief valve 10, and the other end is connected to the oil tank 4. A pressure sensor 13 is also mounted on the second oil outlet pipe 9. The control cabinet 5 also contains a load-sensitive feedback pipe 14, one end of which extends to the test platform 1, and the other end is connected to the first oil outlet pipe 8 via a solenoid valve 15. The control cabinet 5 also contains a drain pipe 16, one end of which extends to the test platform 1, and the other end is connected to the oil tank 4. A flow sensor 11 is also mounted on the drain pipe 16.

[0022] The output end of the motor 3 is connected to a flexible coupling 17, which is shaped like a plum blossom. The clamping mechanism 3 includes a first support plate 31 and a second support plate 32. Both the first support plate 31 and the second support plate 32 have through holes 33 in their centers. The bottom of the first support plate 31 is fixedly connected to the test platform 1. The flexible coupling 17 passes through the through hole 33 of the first support plate 31. The bottom of the second support plate 32 is slidably connected to the test platform 1 through a slide rail 18. Both the first support plate 31 and the second support plate 32 have threaded holes 34 for the installation of the plunger pump.

[0023] The top of the oil tank 4 is equipped with a return oil filter 19, which is connected to the second oil outlet pipe 9 and the drain pipe 16 via a three-way connector 20.

[0024] The control cabinet 5 is equipped with a pressure gauge 21, a temperature display 22 and a flow meter 23. The pressure gauge 21 is connected to the pressure sensor 13 through a pressure guide tube 24. The temperature display 22 and the flow meter 23 are connected to the temperature sensor 12 and the flow sensor 11 respectively through sensing lines.

[0025] The control cabinet 5 is also equipped with a step-down transformer 25, which is connected to the solenoid valve 15.

[0026] The control cabinet 5 is also equipped with a backup direct-acting relief valve 26, which is connected to the first oil outlet pipe 8.

[0027] A motor control box 27 is provided on one side of the test platform 1. The motor control box 27 is connected to the motor 3, and a control switch 28 is provided on the motor control box 27.

[0028] Control cabinet 5 is also equipped with a changeover switch and an emergency stop switch.

[0029] Working principle: When it is necessary to test the airtightness and flow rate of the plunger pump, the plunger pump is placed on the test platform, and the drive shaft of the plunger pump is connected to the motor shaft. At this time, the plunger pump is clamped and fixed by the clamping mechanism, so that the plunger inside the plunger pump slides along the cylinder block. The plunger pump can draw liquid from the oil tank and discharge it back to the oil tank through the first oil outlet pipe. Then, the instrument data is checked, thereby realizing the test of the plunger pump's airtightness and the test of the flow rate under the working pressure.

[0030] The method for conducting detection using the detection device of this utility model is as follows:

[0031] S1. Connect the input end of the plunger pump to be tested to the output end of the motor through a flexible coupling, slide the second support plate to support the other end of the plunger pump, and fix the second support plate with bolts.

[0032] S2. Connect the plunger pump to the pipeline system of the detection device, connect the end of the oil pipe to the oil inlet on the plunger pump, and connect the ports of the first oil outlet pipe, the load-sensitive feedback pipe and the drain pipe to the oil outlet of the plunger pump, the outlet of the load-sensitive compensator and the drain port respectively.

[0033] S3. Open the control valve of the oil pipe on the oil tank and the control valve of the oil inlet on the plunger pump, turn on the control switch of the motor control box, start the motor for trial operation, and test under low, medium and high speed conditions. Check for abnormal noise under no-load operation and check for oil leakage at each interface of the plunger pump.

[0034] S4. After the trial run, inject oil into the outlet chamber of the plunger pump and test the initial data on the pressure gauge and temperature display. Then start the motor and the testing device. Observe whether the motor is running normally. After it is running normally, slowly open the direct-acting relief valve while observing the flow meter and temperature display to check the oil flow rate and oil temperature. After the direct-acting relief valve is fully open, observe whether the flow meter reading reaches the rated flow range of the plunger pump. If it does, with the direct-acting relief valve fully open, run it stably for 30 seconds, then open the solenoid valve and observe the pressure gauge. Subsequently, slowly close the direct-acting relief valve to increase the pressure. Simultaneously observe the pressure gauge. After it rises to 10 MPa, observe the oil output and discharge of the flow meter. Continue to adjust the direct-acting relief valve to reach the rated pressure of the plunger pump. At the same time, observe the discharge flow and three-phase current. If the discharge flow is too large, it indicates that the pump body is not normal. The sealing of the plunger pump's oil outlet chamber can then be determined. At this time, by observing the flow of the plunger pump, if the pressure gauge and temperature display show no abnormalities, and the pressure gauge in the control cabinet displays the pressure value under normal test conditions, compare it with the normal standard air pressure of the product to determine whether the repaired plunger pump is qualified. Conversely, if there is a change, it means that there is leakage between the cylinder and the plunger, and the repair is unqualified.

[0035] S5. After the test is completed, close the control valve on the oil tank. Wait until the oil has completely entered the oil tank through the drain pipe before closing the other valves and turning off the power switches of the motor control box and control cabinet in sequence.

[0036] S6. By performing sealing tests on the oil inlet cavity, oil outlet cavity, and cylinder of the plunger pump, as well as flow rate tests under working pressure, it can accurately determine whether the airtightness of the plunger pump is up to standard. The test process will not damage the plunger pump, and the test is accurate and efficient.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plunger pump testing device, comprising a testing platform (1), characterized in that: The test platform (1) is equipped with a motor (2) and a clamping mechanism (3). An oil tank (4) and a control cabinet (5) are provided on one side of the test platform (1). The oil tank (4) is connected to an oil pipe (7) through a control valve (6). The control cabinet (5) is equipped with a first oil outlet pipe (8) and a second oil outlet pipe (9). One end of the first oil outlet pipe (8) extends toward the test platform (1), and the other end is connected to a direct-acting overflow valve (10). The first oil outlet pipe (8) is also equipped with a flow sensor (11) and a temperature sensor (12). One end of the second oil outlet pipe (9) is connected to a direct-acting overflow valve (10). An overflow valve (10) is connected to the other end of the oil tank (4). A pressure sensor (13) is also provided on the second oil outlet pipe (9). A load-sensitive feedback pipe (14) is also provided inside the control cabinet (5). One end of the load-sensitive feedback pipe (14) extends to the test platform (1), and the other end is connected to the first oil outlet pipe (8) through a solenoid valve (15). A drain pipe (16) is also provided inside the control cabinet (5). One end of the drain pipe (16) extends to the test platform (1), and the other end is connected to the oil tank (4). A flow sensor (11) is also provided on the drain pipe (16).

2. The plunger pump testing device according to claim 1, characterized in that: The output end of the motor (2) is connected to an elastic coupling (17), which is shaped like a plum blossom. The clamping mechanism (3) includes a first support plate (31) and a second support plate (32). Both the first support plate (31) and the second support plate (32) have through holes (33) in their centers. The bottom of the first support plate (31) is fixedly connected to the test platform (1). The elastic coupling (17) passes through the through hole (33) of the first support plate (31). The bottom of the second support plate (32) is slidably connected to the test platform (1) through a slide rail (18). Both the first support plate (31) and the second support plate (32) have threaded holes (34) for the installation of the plunger pump.

3. The plunger pump testing device according to claim 2, characterized in that: The top of the oil tank (4) is provided with a return oil filter (19), which is connected to the second oil outlet pipe (9) and the drain pipe (16) through a three-way connector (20).

4. The plunger pump testing device according to claim 3, characterized in that: The control cabinet (5) is equipped with a pressure gauge (21), a temperature display (22) and a flow meter (23). The pressure gauge (21) is connected to the pressure sensor (13) through a pressure guide tube (24). The temperature display (22) and the flow meter (23) are connected to the temperature sensor (12) and the flow sensor (11) respectively through induction lines.

5. The plunger pump testing device according to claim 4, characterized in that: The control cabinet (5) is also equipped with a step-down device (25), which is connected to a solenoid valve (15).

6. The plunger pump testing device according to claim 5, characterized in that: The control cabinet (5) is also equipped with a spare direct-acting overflow valve (26), which is connected to the first oil outlet pipe (8).

7. The plunger pump testing device according to claim 6, characterized in that: The test platform (1) is provided with a motor control box (27) on one side. The motor control box (27) is connected to the motor (2). The motor control box (27) is provided with a control switch (28).

8. The plunger pump testing device according to claim 7, characterized in that: The control cabinet (5) is also equipped with a changeover switch and an emergency stop switch.

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