Servo motor pump performance test system capable of realizing continuous reversing

Abstract

The invention discloses a servo motor pump performance test system capable of realizing continuous reversing, which realizes the bidirectional continuous reversing test capability of a servo motor pump by arranging a loading oil path for outputting oil in two directions and a pressurizing oil supplementing oil path for absorbing oil in two directions. And by arranging the shell circulating cooling oil way, the temperature of the shell cavity of the servo motor pump can be effectively controlled, the motor pump is effectively cooled, and continuous long-time testing is achieved. And meanwhile, the oil liquid in the tested servo motor pump shell is circularly filtered, so that the cleanliness of the oil liquid is ensured, and the long-time testing capability is supported. The multi-path electromagnetic on-off valve is arranged to be connected with a plurality of oil paths and stations in parallel, so that single / multi-station switching and multi-station simultaneous testing are realized, and the testing efficiency is improved by times.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic system and hydraulic actuation, in particular to a servo motor pump performance testing system capable of realizing continuous reversing. Background Art

[0002] The servo motor pump is the core key product of the emerging electric hydrostatic (hydraulic) actuator system (EHA, Electro-Hydraulic Actuators). It is equivalent to simplifying the traditional three products of "motor, hydraulic pump, servo valve" into one, and has the functions of "power, energy conversion, control", etc. The output flow rate can be controlled by controlling the speed and direction of the servo motor pump. Under the current trend of full electrification, it has broad development space in the fields of aviation, aerospace, navigation and industry.

[0003] Especially in the aerospace field, servo motor pumps have the characteristics of continuous and frequent reversing, as well as variable speed and variable pressure operation. Therefore, it is different from the unidirectional fixed speed and fixed load pressure situation during traditional hydraulic pump testing. When the speed of the tested servo motor pump changes and continuously reverses, the test system must meet the requirements of continuous reversal of the oil circuit and continuous adjustment of the load pressure, so as to obtain the performance data of the servo motor pump under continuous reversing and speed change, as well as different load pressures.

[0004] Currently, there are test systems for servo motor pumps, most of which use traditional hydraulic pump test systems for unidirectional testing. Regarding patent CN211258960U "A axial piston pump performance test system", this patent can only realize the test of unidirectional rotation of the pump and unidirectional oil suction and discharge, and cannot perform directional testing. Regarding patent CN118148902A "A servo motor pump performance test platform and test method", this patent can achieve bidirectional testing capabilities by switching the oil circuit through a solenoid valve, but cannot achieve continuous reversing testing. For example, when the servo motor pump rotates in the forward direction and needs to be reversed, the servo motor pump can only be stopped first, and the solenoid valve switches the suction and discharge oil circuit, and then the servo motor pump is started in the reverse direction for rotation testing. It is impossible to achieve a commutation test in which the servo motor pump speed continuously switches from forward to reverse (such as a speed sinusoidal sweep frequency test, etc.). Summary of the invention

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art, provide a servo motor pump performance test system capable of realizing continuous reversal, and realize the performance test of the servo motor pump with bidirectional continuous reversal.

[0006] The technical solution of the present invention is: a servo motor pump performance test system capable of realizing continuous reversing, comprising a drive control unit, a test unit and a computer measurement and control unit, wherein the test unit comprises a test station module, a hydraulic loading module, an oil return module, an oil replenishment module and an oil tank;

[0007] In the test station module, a number of installation positions for the tested servo motor pump are provided, and the oil ports at both ends of the tested servo motor pump are respectively connected to the first oil circuit and the second oil circuit in the hydraulic loading module;

[0008] In the oil replenishment module, the oil replenishment pump is driven by the motor to draw hydraulic oil from the oil tank to form an oil replenishment oil circuit; the output of the oil replenishment oil circuit is divided into two paths, one of which is connected to the tested servo motor pump through a one-way valve to cool the shell oil of the tested servo motor pump; the other is connected to the first oil circuit and the second oil circuit respectively through a one-way valve and a one-way valve to replenish oil, and the replenishment oil flow direction is replenished to the low-pressure oil circuit in the first oil circuit and the second oil circuit according to the direction of the tested servo motor pump;

[0009] In the oil return module, one end of the oil return circuit is connected to the tested servo motor pump, and the other end is connected to the oil tank to realize the return of the shell cooling oil;

[0010] The hydraulic loading module is provided with a first oil circuit and a second oil circuit which are bidirectionally symmetrical and connected to a bridge circuit composed of one-way valves. A proportional relief valve is connected in series in the bridge circuit. Regardless of whether the tested servo motor pump rotates forward or reverse, the oil flows through the bridge circuit and always flows through the proportional relief valve in one direction, thus realizing a bidirectional continuous reversing test of the tested servo motor pump.

[0011] Furthermore, the bridge circuit is composed of a one-way valve I, a one-way valve II, a one-way valve III and a one-way valve IV; the first oil circuit is connected to the bridge node between the one-way valve I and the one-way valve III, the second oil circuit is connected to the bridge node between the one-way valve II and the one-way valve IV, the bridge node between the one-way valve I and the one-way valve II is connected to the proportional overflow valve and then connected back to the oil tank, and the bridge node between the one-way valve III and the one-way valve IV is connected back to the oil tank.

[0012] Furthermore, in the hydraulic loading module, a bidirectional high-dynamic flowmeter and an electromagnetic on-off valve are connected in parallel between the first oil circuit and the second oil circuit to realize bidirectional continuous no-load testing of the motor pump; electromagnetic on-off valves are connected in parallel at both ends of the proportional relief valve to control the load pressure to two test states: no-load or loaded.

[0013] Furthermore, in the hydraulic loading module, high-pressure safety valves are connected in parallel at both ends of the proportional overflow valve to protect the high-pressure oil circuit; a filter, a flow meter and a cooler are connected in series, which are used for oil filtering, flow measurement and cooling respectively; and a low-pressure safety valve is provided to protect the low-pressure oil circuit; an exhaust valve is provided for exhausting the bidirectional symmetrical oil circuit.

[0014] Furthermore, in the hydraulic loading module, the first oil circuit and the second oil circuit are respectively provided with a pressure gauge, a pressure sensor and a digital display for detecting the oil pressure of the corresponding oil circuit; pressure measuring joints are respectively provided for online calibration of external pressure gauges; a temperature sensor and a digital display are also provided on the oil circuit where the proportional relief valve is located for measuring the oil temperature in the oil circuit.

[0015] Furthermore, in the oil replenishment module, a cooler and a low-pressure filter are connected to the oil replenishment line output from the oil replenishment pump to cool and filter the hydraulic oil flowing through, and then output it to the test station module and the hydraulic loading module; the output end of the low-pressure filter is connected back to the oil tank through a proportional overflow valve to adjust the oil replenishment pressure.

[0016] Furthermore, in the oil replenishment module, a low-pressure pressure gauge, a low-pressure pressure sensor and a digital display are connected to the oil replenishment line for real-time collection of oil replenishment pressure data; and a pressure measuring connector is provided for online calibration of an external pressure gauge.

[0017] Furthermore, in the test station module, the oil ports at both ends of the tested servo motor pump are connected to the first oil circuit and the second oil circuit in the hydraulic loading module through two solenoid valves, and the solenoid valves respectively control the on and off of the oil circuits at both ends of the tested servo motor pump.

[0018] Furthermore, in the test station module, by setting solenoid valve I and solenoid valve II, the oil circuit state of the shell cooling oil return is controlled to realize the oil cooling function of the motor pump shell;

[0019] If the tested servo motor pump has a housing cooling oil interface, solenoid valve I is connected and solenoid valve II is disconnected, so that the oil from the oil replenishment circuit in the oil replenishment module passes through the one-way valve, flows through the motor pump housing, and then flows back to the oil tank through the oil return circuit in the oil return module;

[0020] If the servo motor pump under test is not equipped with a housing cooling oil interface, solenoid valve I is disconnected and solenoid valve II is connected, so that the oil in the oil replenishment circuit is connected to the motor pump housing cavity to maintain the housing cavity pressure, and the excess oil leaked from the pump flows back to the oil tank through the return oil circuit.

[0021] Furthermore, when there are multiple servo motor pumps under test, each servo motor pump under test is provided with a solenoid valve I, and each servo motor pump under test shares a solenoid valve II.

[0022] Furthermore, when there are multiple servo motor pumps to be tested, the oil ports at both ends of each servo motor pump to be tested are connected in parallel to the first oil circuit and the second oil circuit in the hydraulic loading module to achieve simultaneous testing of multiple stations.

[0023] Furthermore, the drive control unit includes two control modes, one is through a frequency converter, and the other is through a DC power supply and a drive controller, to drive and control the tested servo motor pump.

[0024] Furthermore, in the return oil module, a low-pressure pressure gauge, a low-pressure pressure sensor and a digital display are provided on the return oil circuit to detect the return oil pressure; a temperature sensor and a digital display are provided to detect the return oil temperature; a low-pressure filter is connected to filter the return oil; a return oil flowmeter is connected to measure the return oil flow; and a proportional overflow valve is connected to control the pressure and flow of the return oil circuit.

[0025] The advantages of the present invention compared with the prior art are:

[0026] (1) The present invention realizes the bidirectional continuous reversing test capability of the servo motor pump by using a bidirectional symmetrical oil circuit, a bridge circuit composed of multiple one-way valves, a bidirectional oil output loading circuit composed of a proportional relief valve, and a bidirectional oil suction, pressurization and oil replenishment circuit composed of an oil replenishment pump and a one-way valve, compared with the prior art which cannot perform bidirectional continuous reversing test.

[0027] (2) The present invention forms a circulating cooling oil circuit for the servo motor pump housing through an oil replenishment pump, an electromagnetic on-off valve, a proportional relief valve, a cooler and an oil filter. The circulating cooling control of the servo motor pump under test can be achieved by controlling the flow rate and temperature of the oil flowing through the housing cavity of the servo motor pump under test. The servo motor pump temperature can be effectively controlled, solving the problem that the servo motor pump generates severe heat when working continuously under harsh working conditions, and the existing technology cannot effectively cool it and cannot be tested continuously for a long time. At the same time, the oil in the housing of the servo motor pump under test is also filtered to ensure the cleanliness of the oil and support the long-term testing capability.

[0028] (3) The present invention realizes single / multi-station switching and simultaneous testing of multiple stations by setting a multi-way electromagnetic on-off valve in parallel with multiple oil circuits and stations, thereby doubling the testing efficiency.

[0029] (4) The present invention realizes the exhaust function of the two-way oil circuit system by connecting the oil circuit and the switch valve connected to the oil tank in the bridge circuit, thereby avoiding the influence of air in the two-way oil circuit of the closed system on the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the composition of the servo motor pump performance test system of the present invention;

[0031] Figure 2 It is a schematic diagram of the test unit composition of the present invention. DETAILED DESCRIPTION

[0032] In order to better understand the technical solution of the present invention, the specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. The parts of each structure in the accompanying drawings will be described separately. It is worth noting that the elements not shown in the drawings or not described by words are in a form known to ordinary technicians in the relevant technical field. The description of the embodiments here, any reference to direction and orientation, are only for the convenience of description and should not be understood as limiting the scope of protection of the present invention.

[0033] like Figure 1 The servo motor pump performance test system involved in the present invention is composed of a drive control unit, a test unit and a computer measurement and control unit. The drive control unit can realize drive control of the tested servo motor pump through two methods: a frequency converter and a DC power supply + drive controller. The test unit includes a single (or multiple) test station, a hydraulic loading module, an oil tank and an oil replenishment module, and an oil return module.

[0034] Fuel tank and refueling module, such as Figure 2 As shown, the oil tank 1 is provided with an air filter 14, a temperature sensor 15, a temperature digital display 16, a liquid level relay 13, and a liquid level gauge 17.1 and a liquid temperature gauge 17.2, which are used to measure the oil level and temperature of the oil tank, respectively. The oil drain ball valve 18 is used to control the discharge of the oil tank. The oil suction ball valve 2 is used to control the on-off of the oil circuit there. The motor 4 drives the oil replenishment pump 3 to absorb hydraulic oil from the oil tank with an oil suction filter 12 at the inlet. The hydraulic oil flows through the cooler 36 (the on-off of the cooling water is controlled by the water valves 37.1 and 37.2) and the low-pressure filter 5.1 for cooling and filtering. The oil replenishment low pressure is adjusted by the proportional relief valve 6. The oil replenishment low pressure data is collected in real time by the low-pressure pressure gauge 8.1, the low-pressure pressure sensor 9.1 and the digital display 10.1, and the pressure gauge can be connected externally through the pressure measuring joint 7.1 for online calibration. The low-pressure oil output from the oil replenishment pump is connected to the bidirectional symmetrical oil circuit of the servo motor pump through the one-way valve 11.1 and the one-way valve 11.2 respectively, so as to replenish the oil and keep the low-pressure of the pump suction oil controllable. The specific replenishment oil flow direction here can be adaptively replenished to the corresponding low-pressure oil circuit in the bidirectional symmetrical oil circuit according to the steering direction of the motor pump under test.

[0035] Hydraulic loading modules, such as Figure 2 As shown, a bidirectional symmetrical oil circuit is provided, and the bidirectional oil ports of the tested servo motor pump are respectively connected to a bridge circuit composed of four one-way valves 24.1, 24.2, 24.3, and 24.4. A proportional relief valve 26 is connected in series in the bridge circuit. This structure realizes that no matter whether the servo motor pump is rotating forward or reverse, that is, no matter which end of the corresponding bidirectional oil circuit is the oil suction circuit and which end is the oil discharge circuit, the oil can pass through the bridge circuit to ensure that the direction of the oil flowing through the proportional relief valve 26 is always in one direction ( Figure 2 ), thus achieving continuous bidirectional commutation and loading test.

[0036] Among them, the proportional relief valve 26 is used to adjust the load pressure, the parallel high-pressure safety valve 27 is used to protect the high-pressure oil circuit, and the parallel electromagnetic on-off valve 28.1 is used to control the load pressure to two test states: no-load / loaded. The temperature sensor 25.1 and the digital display 10.4 are used to measure the oil temperature, the flow meter 22 is used to measure the flow rate, the filter 29 and the cooler 35 are used to filter and cool the oil respectively. The low-pressure safety valve 30 is used to protect the low-pressure oil circuit. The pressure gauges 19.1, 19.2, the pressure sensors 20.1, 20.2, and the digital displays 10.1, 10.2 are used to detect the oil pressure of the oil circuit. Through the pressure measuring joints 7.2, 7.3, an external pressure gauge can be connected for online calibration.

[0037] The oil replenishment and pressure increase when the motor pump sucks oil in the two-way oil circuit is supplemented by the oil output by the replenishment pump 3 through the one-way valves 11.1 and 11.2.

[0038] In addition, a bidirectional high dynamic flow meter 21 and an electromagnetic on-off valve 28.2 are provided in parallel at both ends of the bidirectional symmetrical oil circuit (which can be directly connected to both ends of the pump inlet and outlet) to realize the bidirectional continuous no-load dynamic flow test of the motor pump. An exhaust valve 31 is provided for exhausting the bidirectional oil circuit.

[0039] Workstation modules, such as Figure 2 As shown, by controlling the on-off of the solenoid valve of the corresponding oil circuit, the servo motor pump of one or more station circuits can be tested, and the motor pump housing oil cooling function can be realized. To simplify the description, only two groups of servo motor pump test stations are listed in the figure (it can also be expanded in parallel to 3 or more stations for simultaneous testing of more motor pumps). The servo motor pumps 38.1 and 38.2 to be tested are installed on the test station, and the on-off of the oil circuits at both ends of the motor pump is controlled by the solenoid valves 32.4, 32.5, 32.6, and 32.7 respectively; the state of the housing return oil circuit is controlled by the solenoid valves 32.1, 32.2 and 32.3 to realize the motor pump housing oil cooling function. If the tested servo motor pump has a casing cooling oil interface, the interfaces at both ends are connected to the casing oil circuits at the motor end and the pump end respectively, the solenoid valve 32.1 is connected, and 32.3 is disconnected, so that the oil in the replenishing pump passes through the one-way valve 23, flows through the motor pump casing, and then flows back to the oil tank through the return oil circuit; if the tested servo motor pump does not have a casing cooling oil interface, the only return oil port is connected to the casing oil circuit at the pump end, the solenoid valve 32.1 is disconnected, and the solenoid valve 32.3 is connected, so that the oil in the replenishing pump can be connected to the motor pump casing cavity to maintain the casing cavity pressure, and the excess oil leaking from the pump can flow back to the oil tank through the return oil circuit.

[0040] Oil return module, such as Figure 2As shown, the return oil circuit is provided with a low-pressure pressure gauge 8.2, a low-pressure pressure sensor 9.2, and a digital display 10.5 to detect the return oil pressure; a temperature sensor 25.2 and a digital display 10.6 are provided to detect the return oil temperature; a low-pressure filter 5.2 is used to filter the return oil; a return oil flowmeter 33 measures the return oil flow; and a proportional relief valve 34 is used to control the pressure and flow of the return oil circuit.

[0041] It is to be understood that the present invention is described by way of embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and embodiments that can fall within the scope of the claims of this application all fall within the scope protected by the present invention.

[0042] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A servo motor pump performance test system capable of realizing continuous reversing, comprising a drive control unit, a test unit and a computer measurement and control unit, characterized in that: The test unit includes a test station module, a hydraulic loading module, an oil return module, an oil replenishment module and an oil tank; In the test station module, a number of installation positions for the tested servo motor pump are provided, and the oil ports at both ends of the tested servo motor pump are respectively connected to the first oil circuit and the second oil circuit in the hydraulic loading module; In the oil replenishment module, the oil replenishment pump (3) is driven by the motor (4) to absorb hydraulic oil from the oil tank to form an oil replenishment oil circuit; the output of the oil replenishment oil circuit is divided into two paths, one of which is connected to the tested servo motor pump through a one-way valve (23) for cooling the housing oil of the tested servo motor pump; the other of which is connected to the first oil circuit and the second oil circuit respectively through a one-way valve (11.1) and a one-way valve (11.2) for replenishing oil, and the replenishment oil flows to replenish the low-pressure oil circuit in the first oil circuit and the second oil circuit according to the direction of the tested servo motor pump; In the oil return module, one end of the oil return circuit is connected to the tested servo motor pump, and the other end is connected to the oil tank to realize the return of the shell cooling oil; The hydraulic loading module is provided with a first oil circuit and a second oil circuit which are bidirectionally symmetrical and connected to a bridge circuit composed of four one-way valves. A proportional relief valve (26) is connected in series in the bridge circuit. Regardless of whether the tested servo motor pump rotates forward or reverse, the oil flows through the bridge circuit and always flows through the proportional relief valve (26) in one direction, thereby realizing a bidirectional continuous reversing test of the tested servo motor pump.

2. The servo motor pump performance test system capable of realizing continuous reversing according to claim 1, characterized in that: The bridge circuit is composed of a one-way valve I (24.1), a one-way valve II (24.2), a one-way valve III (24.3) and a one-way valve IV (24.4); the first oil circuit is connected to the bridge node between the one-way valve I and the one-way valve III, the second oil circuit is connected to the bridge node between the one-way valve II and the one-way valve IV, the bridge node between the one-way valve I and the one-way valve II is connected to a proportional overflow valve (26) and then connected back to the oil tank (1), and the bridge node between the one-way valve III and the one-way valve IV is connected back to the oil tank (1).

3. The servo motor pump performance test system capable of realizing continuous reversing according to claim 2, characterized in that: In the hydraulic loading module, a bidirectional high-dynamic flow meter (21) and an electromagnetic on-off valve (28.2) are connected in parallel between a first oil circuit and a second oil circuit to realize a bidirectional continuous no-load test of a motor pump; and electromagnetic on-off valves (28.1) are connected in parallel at both ends of a proportional relief valve (26) to control the load pressure to be in two test states, no-load or loaded.

4. The servo motor pump performance test system capable of realizing continuous reversing according to claim 3, characterized in that: In the hydraulic loading module, high-pressure safety valves (27) are connected in parallel at both ends of the proportional relief valve (26) to protect the high-pressure oil circuit; a filter (29), a flow meter (22) and a cooler (35) are connected in series to filter, measure flow and cool the oil respectively; a low-pressure safety valve (30) is provided to protect the low-pressure oil circuit; and an exhaust valve (31) is provided to exhaust the bidirectional symmetrical oil circuit.

5. The servo motor pump performance test system capable of realizing continuous reversing according to claim 1, characterized in that: In the oil replenishment module, the oil replenishment oil circuit output from the oil replenishment pump (3) is connected to a cooler (36) and a low-pressure filter (5.1) to cool and filter the hydraulic oil flowing through, and then output it to the test station module and the hydraulic loading module; The output end of the low-pressure filter (5.1) is connected back to the oil tank (1) through a proportional relief valve (6) to adjust the oil replenishment pressure.

6. The servo motor pump performance test system capable of realizing continuous reversing according to claim 1, characterized in that: In the test station module, the oil ports at both ends of the tested servo motor pump are connected to the first oil circuit and the second oil circuit in the hydraulic loading module through two solenoid valves, and the solenoid valves respectively control the on and off of the oil circuits at both ends of the tested servo motor pump.

7. The servo motor pump performance test system capable of realizing continuous reversing according to claim 1, characterized in that: In the test station module, by setting the solenoid valve I (32.1) and the solenoid valve II (32.3), the oil circuit state of the shell cooling oil return is controlled to realize the motor pump shell oil cooling function; If the tested servo motor pump has a housing cooling oil interface, solenoid valve I (32.1) is connected and solenoid valve II (32.3) is disconnected, so that the oil from the oil replenishment circuit in the oil replenishment module passes through the one-way valve (23), flows through the motor pump housing, and then flows back to the oil tank through the oil return circuit in the oil return module; If the tested servo motor pump is not equipped with a housing cooling oil interface, solenoid valve I (32.1) is disconnected and solenoid valve II (32.3) is connected, so that the oil in the oil replenishment circuit is connected to the motor pump housing cavity to maintain the housing cavity pressure, and the excess oil leaked from the pump flows back to the oil tank through the return oil circuit.

8. The servo motor pump performance test system capable of realizing continuous reversing according to claim 7, characterized in that: When there are multiple servo motor pumps under test, each servo motor pump under test is provided with a solenoid valve I, and each servo motor pump under test shares a solenoid valve II.

9. The servo motor pump performance test system capable of realizing continuous reversing according to claim 1, characterized in that: When there are multiple servo motor pumps to be tested, the oil ports at both ends of each servo motor pump to be tested are connected in parallel to the first oil circuit and the second oil circuit in the hydraulic loading module to achieve simultaneous testing of multiple stations.

10. The servo motor pump performance test system capable of realizing continuous reversing according to claim 1, characterized in that: The drive control unit includes two control modes, one is through the frequency converter, and the other is through the DC power supply and the drive controller, to drive and control the servo motor pump under test.

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