Axial plunger variable displacement pump test device and hydraulic system thereof

Abstract

This invention provides a test device for an axial piston variable pump and its hydraulic system, including a test bench and a measuring frame. A motor and an oil tank are respectively installed at both ends of the test bench, with space between the motor and the oil tank to accommodate a double-unit test pump and oil pipes. The double-unit test pump is mounted on the motor, and the oil pipes connect the double-unit test pump to the oil tank. The measuring frame has two layers; a multi-way directional valve is installed on the lower support surface, and a pressure gauge I, a pre-flow valve, a pressure gauge II, and a flow meter are installed on the upper support surface. The pressure gauge I, pre-flow valve, pressure gauge II, multi-way directional valve, and flow meter are connected to the double-unit test pump and the oil tank via oil pipes. This invention can perform quality inspection of single pumps and tandem pumps. It not only has a simple structure, greatly reducing the difficulty of operation and subsequent maintenance costs, but also has low cost, requiring only simple pressure gauges and flow meters to perform the experiment.

Description

Technical Field

[0001] This utility model relates to a test device for an axial piston variable pump and its hydraulic system. Background Technology

[0002] Currently available commercially available plunger pump factory test benches are used for factory testing of both open and closed plunger pumps, and can simultaneously perform factory tests on single pumps and tandem pumps. The test bench consists of a hydraulic control system, a circulating filtration and temperature control system, a hydraulic loading system, a leak recovery system, an electrical control system, and a computer control and testing system. The test bench adopts a containerized structure, allowing the main pump and auxiliary pump to be loaded separately. However, they are expensive, with a single unit costing between 90,000 and 150,000 yuan; the operation process is complex, requiring professional technicians; and the high maintenance and operating costs reduce their economic value. For example, the novel turbine generator pulse plunger pump test bench disclosed in CN204152775U has an overflow valve and a first pressure gauge after the pump, and a second pressure gauge on the return oil line of the oil tank. The pump's pressure holding performance is measured by comparing the readings of the two pressure gauges, and the pump's displacement is read through a flow meter. However, it can only perform single pump tests, and the pressure holding capacity of the pump requires comparison of the readings from both pressure gauges. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an axial piston variable pump test device and its hydraulic system.

[0004] This utility model is achieved through the following technical solution.

[0005] This utility model provides an axial piston variable pump test device and its hydraulic system, including a test bench and a measuring frame. A motor and an oil tank are respectively installed at both ends of the test bench, with space between the motor and the oil tank to accommodate a double-unit test pump and oil pipes. The double-unit test pump is mounted on the motor, and the oil pipes connect the double-unit test pump to the oil tank. The measuring frame has two layers; a multi-way directional valve is installed on the lower support surface, and a pressure gauge I, a pre-flow valve, a pressure gauge II, and a flow meter are installed on the upper support surface. The pressure gauge I, pre-flow valve, pressure gauge II, multi-way directional valve, and flow meter are connected to the double-unit test pump and the oil tank via oil pipes.

[0006] The measuring frame includes a lower plate and an upper plate. The lower plate and the upper plate are of the same length, and the width of the lower plate is greater than that of the upper plate. The four corners of the lower plate and the upper plate are connected by a support column, and the end of the support column extends to the bottom of the lower plate.

[0007] A side plate is also fixed to one side of the upper plate. The side plate is machined with corresponding through holes for pressure gauge I, pressure gauge II, and flow meter. The side of pressure gauge I, pressure gauge II, and flow meter with readings is embedded in the through holes.

[0008] The bottom of the upper plate is also machined with a through hole, and pressure gauge II is fixed in the through hole.

[0009] The system includes a dual-pump test unit, which is driven by a motor. Both inlets of the dual-pump test unit are connected to an oil tank. The outlet of the motor (P) of the dual-pump test unit is connected to the inlet of a multi-way directional valve. The outlet of the dual-pump test unit (P) is connected to the oil tank and a flow meter is installed on the pipeline. The LS port of the multi-way directional valve is connected to the feedback port of the dual-pump test unit. The M port of the multi-way directional valve is connected to pressure gauge I. Ports A and B are connected to the test load. Ports a and b are connected to the outlet and return ports of the pre-flow valve, respectively. The other outlet of the multi-way directional valve is connected to the inlet of the pre-flow valve and a pressure gauge II is installed on the pipeline.

[0010] The beneficial effects of this utility model are: it can realize the quality inspection of single pumps and series pumps. Not only is the structure simple, which greatly reduces the difficulty of operation and subsequent maintenance costs, but it is also low in cost, as only a simple pressure gauge and flow meter are needed to carry out the experiment. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the principle of this utility model.

[0012] Figure 2 This is a schematic diagram of the implementation structure of this utility model.

[0013] Figure 3 This is a schematic diagram of the watch frame structure of this utility model.

[0014] In the diagram: 1-Motor, 2-Double test pump, 3-Oil tank, 4-Pressure gauge I, 5-Pressure valve, 6-Pressure gauge II, 7-Multi-way directional valve, 8-Flow meter, 9-Oil pipe, 10-Experimental load, 11-Support column, 12-Lower plate, 13-Upper plate, 14-Side plate. Detailed Implementation

[0015] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0016] This utility model discloses an axial piston variable pump testing device and its hydraulic system, including a test bench and a measuring frame. A motor 1 and an oil tank 3 are respectively installed at both ends of the test bench, with space between the motor 1 and the oil tank 3 to accommodate a double-unit test pump 2 and an oil pipe 9. The double-unit test pump 2 is mounted on the motor 1, and the oil pipe 9 connects the double-unit test pump 2 to the oil tank 3. The measuring frame has two layers. A multi-way directional valve 7 is installed on the lower support surface, and a pressure gauge I 4, a pre-flow valve 5, a pressure gauge II 6, and a flow meter 8 are installed on the upper support surface. The pressure gauge I 4, pre-flow valve 5, pressure gauge II 6, multi-way directional valve 7, and flow meter 8 are connected to the double-unit test pump 2 and the oil tank 3 via oil pipes. The test bench and the measuring frame are separate, allowing the measuring frame to be matched and replaced according to the pump under test, and facilitating pipeline connections before testing.

[0017] The measuring frame includes a lower plate 12 and an upper plate 13. The lower plate 12 and the upper plate 13 have the same length. The width of the lower plate 12 is greater than the width of the upper plate 13. The four corners of the lower plate 12 and the upper plate 13 are connected by a support column 11. The end of the support column 11 extends to the bottom of the lower plate 12.

[0018] A side plate 14 is also fixed to one side of the upper plate 13. The side plate 14 is respectively machined with through holes for pressure gauge I 4, pressure gauge II 6, and flow meter 8. The side of pressure gauge I 4, pressure gauge II 6, and flow meter 8 with readings are respectively embedded in the through holes.

[0019] The bottom of the upper plate 13 is also machined with a through hole, and the pressure gauge II6 is fixed in the through hole.

[0020] In the test setup, the hydraulic circuit of the double-unit test pump 2 is as follows: Figure 1 As shown, the double test pump 2 is driven by motor 1. Both inlets of the double test pump 2 are connected to the oil tank 3. The outlet of motor 1 of the double test pump 2 is connected to the inlet of the multi-way directional valve 7. The outlet of the double test pump 2 is connected to the oil tank 3 and a flow meter 8 is installed on the pipeline. The LS port of the multi-way directional valve 7 is connected to the feedback port of the double test pump 2. The M port of the multi-way directional valve 7 is connected to pressure gauge I 4. The A and B ports are connected to the test load 10. The a and b ports are connected to the outlet and return ports of the first-pass valve 5, respectively. The other outlet of the multi-way directional valve 7 is connected to the inlet of the first-pass valve 5 and a pressure gauge II 6 is installed on the pipeline.

[0021] like Figure 1As shown, the principle of this invention is to simulate the working state of a plunger pump and test its rated pressure and nominal flow rate. During the test, the plunger pump under test is first started at maximum displacement and no-load pressure. After running for 10 minutes, pressure gauge II is read to obtain the plunger pump's standby pressure data. The pilot valve is operated to provide pilot control oil to the multi-way valve. The LS port of the multi-way valve supplies hydraulic oil to the plunger pump's load pressure feedback (LS) port, enabling the pump to operate at its rated pressure. Pressure gauge I is read to obtain the plunger pump's working pressure value. In the illustrated test of the double plunger pump, when testing the pressure of plunger pump P1, the high-pressure outlet of plunger pump P2 is connected in series with a flow meter and directly back to the oil tank. When simultaneously supplying fluid to the LS port of the double plunger pump, the flow rate at plunger pump P2 port can be directly read on the flow meter to measure the plunger pump's displacement value.

[0022] exist Figure 2 The diagram illustrates a dual-plunger pump test. By interchangeing the oil pipes of the two plungers, P1 and P2, the displacement and rated pressure of each plunger pump can be measured in two separate tests. For a single-plunger pump test, one additional pump is required. The principle for a triple-plunger pump test is the same as for a dual-plunger pump test. While testing the pressure of one plunger pump, the flow rates of the other two plungers can be tested simultaneously. Interchanging the high-pressure oil outlet pipes of each pump completes all the tests.

Claims

1. An axial piston variable displacement pump test apparatus comprising a test bench and a measuring frame, characterized in that: The experimental platform is equipped with a motor (1) and an oil tank (3) at both ends. There is space between the motor (1) and the oil tank (3) to accommodate the double test pump (2) and the oil pipe (9). The double test pump (2) is installed on the motor (1). The oil pipe (9) connects the double test pump (2) to the oil tank (3). The measuring frame has two layers. A multi-way reversing valve (7) is installed on the lower support surface. A pressure gauge I (4), a first-pass valve (5), a pressure gauge II (6), and a flow meter (8) are installed on the upper support surface. The pressure gauge I (4), the first-pass valve (5), the pressure gauge II (6), the multi-way reversing valve (7), and the flow meter (8) are connected to the double test pump (2) and the oil tank (3) through the oil pipe.

2. The axial piston variable displacement pump test apparatus of claim 1, wherein: The measuring frame includes a lower plate (12) and an upper plate (13). The lower plate (12) and the upper plate (13) have the same length. The width of the lower plate (12) is greater than the width of the upper plate (13). The four corners of the lower plate (12) and the upper plate (13) are connected by a support column (11). The end of the support column (11) extends out to the bottom of the lower plate (12).

3. The axial piston variable displacement pump test apparatus of claim 2, wherein: A side plate (14) is also fixed to one side of the upper plate (13). The side plate (14) is respectively machined with through holes for pressure gauge I (4), pressure gauge II (6), and flow meter (8). The side of pressure gauge I (4), pressure gauge II (6), and flow meter (8) with readings are respectively embedded in the through holes.

4. The axial piston variable displacement pump test apparatus of claim 3, wherein: The bottom of the upper plate (13) is also machined with a through hole, and the pressure gauge II (6) is fixed in the through hole.

5. The hydraulic system of an axial-piston variable-displacement pump test apparatus according to any one of claims 1 to 4, characterized by: The test includes a double test pump (2), which is driven by a motor (1). Both inlets of the double test pump (2) are connected to the oil tank (3). The outlet of the motor (1) of the double test pump (2) is connected to the inlet of the multi-way directional valve (7). The outlet of the double test pump (2) is connected to the oil tank (3) and a flow meter (8) is installed on the pipeline. The LS port of the multi-way directional valve (7) is connected to the feedback port of the double test pump (2). The M port of the multi-way directional valve (7) is connected to the pressure gauge I (4). The A and B ports are connected to the test load (10). The a and b ports are connected to the outlet and return ports of the first-pass valve (5) respectively. The other outlet of the multi-way directional valve (7) is connected to the inlet of the first-pass valve (5) and a pressure gauge II (6) is installed on the pipeline.

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