A servo motor pump performance test system capable of achieving continuous reversing

Abstract

This invention discloses a servo motor pump performance testing system capable of continuous reversing. By setting up a bidirectional output oil loading circuit and a bidirectional suction booster oil supply circuit, the system achieves bidirectional continuous reversing testing capability for the servo motor pump. Furthermore, by incorporating a casing circulation cooling oil circuit, the system effectively controls the temperature of the servo motor pump casing, solving the problem of effective cooling and enabling continuous long-term testing. Simultaneously, the system circulates and filters the oil within the tested servo motor pump casing, ensuring oil cleanliness and supporting long-term testing capabilities. By setting up multiple electromagnetic on / off valves in parallel with multiple oil circuits and stations, single / multi-station switching and simultaneous testing at multiple stations are achieved, significantly improving testing efficiency.

Description

Technical Field

[0001] This invention relates to the field of hydraulic systems and hydraulic actuation technology, and in particular to a servo motor pump performance testing system capable of continuous reversing. Background Technology

[0002] Servo motor pumps are the core products of emerging electro-hydraulic actuators (EHA). They simplify the traditional three products of "motor, hydraulic pump, and servo valve" into one, combining functions such as "power, energy conversion, and control". The output flow rate and direction can be controlled by controlling the speed and direction of the servo motor pump. Under the current trend of all-electric development, they have broad development prospects in the fields of aviation, aerospace, marine and industrial sectors.

[0003] Especially in the aerospace field, servo motor pumps are characterized by continuous and frequent reversing, as well as variable speed and pressure operation. Therefore, unlike the traditional hydraulic pump test which uses a unidirectional constant speed and constant load pressure, when the speed of the tested servo motor pump changes and it continuously reverses, the test system must meet the requirements of continuous oil circuit reversal and continuous load pressure adjustment in order to obtain various performance data of the servo motor pump under continuous reversing speed change and different load pressures.

[0004] Currently available testing systems for servo motor pumps mostly employ traditional hydraulic pump testing systems for unidirectional testing. Regarding patent CN211258960U, "A Performance Testing System for an Axial Piston Pump," this patent can only perform unidirectional pump rotation and unidirectional oil suction and discharge testing, and cannot perform directional testing. Regarding patent CN118148902A, "A Performance Testing Platform and Method for a Servo Motor Pump," this patent can achieve bidirectional testing capability by switching the oil circuit using a solenoid valve, but it cannot achieve continuous directional testing. For example, when the servo motor pump is rotating forward and needs to be reversed, the servo motor pump must first be stopped, the solenoid valve switched the suction and discharge oil circuits, and then the servo motor pump restarted in the opposite direction for testing. It cannot perform directional testing where the servo motor pump speed continuously switches from forward to reverse (such as sinusoidal frequency sweep testing). Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a servo motor pump performance testing system that can realize continuous commutation, thereby enabling bidirectional continuous commutation performance testing of servo motor pumps.

[0006] The technical solution of the present invention is: a servo motor pump performance testing system capable of 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, a return oil module, a replenishment oil module and an oil tank;

[0007] The test station module provides several mounting positions for the test servo motor pump, and the oil ports at both ends of the test 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 motor drives the oil replenishment pump to draw hydraulic oil from the oil tank, forming an oil replenishment circuit. The output of the oil replenishment circuit is divided into two paths. One path is connected to the tested servo motor pump through a check valve to cool the housing oil of the tested servo motor pump. The other path is connected to the first oil circuit and the second oil circuit through check valves and check valves respectively to replenish the oil. The oil replenishment flow direction is based on the rotation direction of the tested servo motor pump to replenish the low-pressure oil circuit in the first oil circuit and the second oil circuit.

[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 cooling oil in the shell.

[0010] The hydraulic loading module is equipped with a bidirectional symmetrical first oil circuit and a second oil circuit, which are 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 backward, the oil flows through the bridge circuit and always flows through the proportional relief valve in one direction, so as to realize the bidirectional continuous reversing test of the tested servo motor pump.

[0011] Furthermore, the bridge circuit consists of check valve I, check valve II, check valve III, and check valve IV; the first oil circuit is connected to the bridge node between check valve I and check valve III, the second oil circuit is connected to the bridge node between check valve II and check valve IV, the bridge node between check valve I and check valve II is connected to the proportional relief valve and then to the return oil tank, and the bridge node between check valve III and check valve IV is connected to the return oil tank.

[0012] Furthermore, in the hydraulic loading module, a bidirectional high dynamic flow meter 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 either no-load or loaded test states.

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

[0014] Furthermore, in the hydraulic loading module, pressure gauges, pressure sensors, and digital displays are respectively installed on the first and second oil circuits to detect the oil pressure in the corresponding oil circuits; pressure test connectors are also provided for connecting external pressure gauges for online calibration; a temperature sensor and a digital display are also installed on the oil circuit where the proportional relief valve is located for measuring the oil temperature in that 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 it before outputting it to the test station module and the hydraulic loading module; the output end of the low-pressure filter is connected to the return oil tank through a proportional relief valve to adjust the oil replenishment pressure.

[0016] Furthermore, the oil replenishment module is equipped with a low-pressure gauge, a low-pressure sensor, and a digital display on the oil replenishment line to collect oil replenishment pressure data in real time; and a pressure testing 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 and second oil circuits in the hydraulic loading module through two solenoid valves, respectively. The solenoid valves control the on / off state of the oil circuits at both ends of the tested servo motor pump.

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

[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 flows through the check valve, passes 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 tested servo motor pump does not have a housing cooling oil interface, solenoid valve I is disconnected and solenoid valve II is connected, so that the oil in the replenishment oil circuit is connected to the motor pump housing cavity to maintain the housing cavity pressure, and the excess oil leaked by the pump flows back to the oil tank through the return oil circuit.

[0021] Furthermore, when there are multiple tested servo motor pumps, each tested servo motor pump is equipped with a solenoid valve I, and all tested servo motor pumps share a solenoid valve II.

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

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

[0024] Furthermore, the return oil module is equipped with a low-pressure gauge, a low-pressure sensor, and a digital display on the return oil line to detect the return oil pressure; a temperature sensor and a digital display are installed to detect the return oil temperature; a low-pressure filter is connected to filter the return oil; a return oil flow meter is connected to measure the return oil flow; and a proportional relief valve is connected to control the pressure and flow of the return oil line.

[0025] The advantages of this invention compared to the prior art are:

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

[0027] (2) This invention establishes a circulating cooling oil circuit for the servo motor pump housing using an oil replenishment pump, an electromagnetic on / off valve, a proportional relief valve, a cooler, and an oil filter. By controlling the flow rate and temperature of the oil flowing through the test servo motor pump housing, the circulating cooling control of the test servo motor pump can be achieved. This effectively controls the temperature of the servo motor pump, solving the problem of severe heat generation during continuous operation under harsh conditions, which existing technologies cannot effectively cool and cannot perform continuous long-term testing. Simultaneously, the circulating filtration of the oil within the test servo motor pump housing ensures oil cleanliness, supporting long-term testing capabilities.

[0028] (3) By setting up multiple electromagnetic on / off valves in parallel with multiple oil circuits and workstations, the present invention realizes single / multi-workstation switching and simultaneous testing of multiple workstations, thereby increasing the testing efficiency several times.

[0029] (4) The present invention achieves the exhaust function of the bidirectional oil circuit system by connecting the oil circuit and the switch valve in the bridge circuit, thereby avoiding the influence of air in the bidirectional oil circuit of the closed system on the test. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the servo motor pump performance testing system of the present invention;

[0031] Figure 2 This is a schematic diagram of the experimental unit composition of the present invention. Detailed Implementation

[0032] To better understand the technical solution of the present invention, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Parts of each structure in the drawings will be described separately. It is worth noting that elements not shown in the drawings or not described in words are in forms known to those skilled in the art. Any references to directions and orientations in the description of the embodiments herein are for ease of description only and should not be construed as limiting the scope of protection of the present invention.

[0033] like Figure 1 The servo motor pump performance testing system described in this invention consists of a drive control unit, a test unit, and a computer measurement and control unit. The drive control unit can drive and control the tested servo motor pump using either a frequency converter or a DC power supply + drive controller. The test unit comprises one (or more) test stations, a hydraulic loading module, an oil tank and oil replenishment module, and a return oil module.

[0034] Fuel tank and refueling module, such as Figure 2 As shown, the oil tank 1 is equipped with an air filter 14, a temperature sensor 15, a digital temperature display 16, a level relay 13, a level gauge 17.1, and a liquid temperature gauge 17.2, which are used to measure the oil level and temperature in the tank, respectively. A drain ball valve 18 is used to control the discharge of oil from the tank. A suction ball valve 2 is used to control the opening and closing of the oil circuit at this location. The motor 4 drives the replenishment pump 3 to draw hydraulic oil from the tank, which has a suction filter 12 at the inlet. The hydraulic oil flows through the cooler 36 (the flow of cooling water is controlled by water valves 37.1 and 37.2) and the low-pressure filter 5.1 for cooling and filtration. The replenishment low-pressure is adjusted by the proportional relief valve 6. The replenishment low-pressure data is collected in real time by the low-pressure gauge 8.1, the low-pressure sensor 9.1, and the digital display 10.1. An external pressure gauge can be connected to the pressure test connector 7.1 for online calibration. The low-pressure oil output from the replenishing pump is connected to the bidirectional symmetrical oil circuit of the servo motor pump through check valves 11.1 and 11.2 respectively to replenish the oil and keep the pump suction low pressure controllable. The specific replenishing oil flow direction can be adaptively replenished to the corresponding low-pressure oil circuit in the bidirectional symmetrical oil circuit according to the direction of rotation of the tested motor pump.

[0035] Hydraulic loading module, such as Figure 2 As shown, a bidirectional symmetrical oil circuit is set up. The bidirectional oil ports of the tested servo motor pump are respectively connected to a bridge circuit composed of four check 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 ensures that regardless of whether the servo motor pump rotates forward or reverse, that is, regardless of which end of the corresponding bidirectional oil circuit is the suction oil circuit and which end is the discharge oil circuit, the direction of the oil flowing through the proportional relief valve 26 is always in one direction through the bridge circuit. Figure 2 (From left to right) thus enabling continuous bidirectional reversal and loading tests.

[0036] The system includes a proportional relief valve 26 for regulating load pressure, a parallel high-pressure safety valve 27 for protecting the high-pressure oil circuit, and a parallel solenoid on / off valve 28.1 for controlling the load pressure to either no-load or loaded test states. A temperature sensor 25.1 and a digital display 10.4 measure oil temperature, a flow meter 22 measures flow rate, and a filter 29 and a cooler 35 filter and cool the oil, respectively. A low-pressure safety valve 30 protects the low-pressure oil circuit. Pressure gauges 19.1 and 19.2, pressure sensors 20.1 and 20.2, and digital displays 10.1 and 10.2 are used to detect oil pressure in the oil circuit. External pressure gauges can be connected to pressure testing connectors 7.2 and 7.3 for online calibration.

[0037] In the bidirectional oil circuit, the oil replenishment and pressurization during the oil suction of the motor pump is supplemented by the oil output by the oil replenishment pump 3 through the check 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 connected in parallel at both ends of the bidirectional symmetrical oil circuit (which can be directly connected to the inlet and outlet ends of the pump) to realize 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 module, such as Figure 2 As shown, the servo motor pumps of one or more workstations can be tested and the pump housing oil cooling function can be achieved by controlling the on / off state of the solenoid valves corresponding to the oil circuits. For simplicity, only two sets of servo motor pump test stations are shown in the figure (they can also be connected in parallel to expand to three or more stations for simultaneous testing of more pumps). The servo motor pumps under test, 38.1 and 38.2, are installed on the test stations. The on / off state of the oil circuits at both ends of the pump is controlled by solenoid valves 32.4, 32.5, 32.6, and 32.7, respectively. The oil return circuit state of the pump housing is controlled by solenoid valves 32.1, 32.2, and 32.3 to achieve the pump housing oil cooling function. If the tested servo motor pump has a housing cooling oil interface, connect both interfaces to the housing oil circuits at the motor end and the pump end respectively. With solenoid valve 32.1 open and 32.3 closed, the oil from the replenishing pump flows through the one-way valve 23, through the motor pump housing, and then back to the oil tank through the return oil circuit. If the tested servo motor pump does not have a housing cooling oil interface, connect the only return oil port to the housing oil circuit at the pump end, disconnect solenoid valve 32.1, and connect solenoid valve 32.3. This allows the oil from the replenishing pump to reach the motor pump housing cavity to maintain the housing cavity pressure, and excess oil leaked by 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 equipped with a low-pressure gauge 8.2, a low-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 flow meter 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 understood that this invention has been described through embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to adapt to specific circumstances without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

[0042] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A servo motor pump performance testing system capable of continuous commutation, comprising a drive control unit, a testing unit, and a computer measurement and control unit, characterized in that: The test unit includes a test station module, a hydraulic loading module, a return oil module, a replenishment oil module, and an oil tank; The test station module provides several installation positions for the tested servo motor pump. 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, respectively. Solenoid valve I (32.1) and solenoid valve II (32.3) are provided to control the oil circuit state of the housing cooling oil return, so as to realize the oil cooling function of the motor pump housing. 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 flows through the check valve (23), passes through the motor pump housing, and flows back to the oil tank through the return oil circuit in the return oil module. If the tested servo motor pump does not have a housing cooling oil interface, solenoid valve I (32.1) is disconnected and solenoid valve II (32.3) is connected, so that the oil from the oil replenishment circuit is connected to the motor pump housing cavity to maintain the housing cavity pressure, and the excess oil leaked by the pump flows back to the oil tank through the return oil circuit. In the oil replenishment module, the oil replenishment pump (3) driven by the motor (4) draws hydraulic oil from the oil tank to form an oil replenishment circuit. The output of the oil replenishment circuit is divided into two paths. One path is connected to the tested servo motor pump through the check valve (23) to cool the housing oil of the tested servo motor pump. The other path is connected to the first oil circuit and the second oil circuit through the check valve (11.1) and the check valve (11.2) respectively to replenish the oil. The oil replenishment flow direction is to replenish the low-pressure oil circuit in the first oil circuit and the second oil circuit according to the rotation 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 cooling oil in the shell. The hydraulic loading module is equipped with a bidirectional symmetrical first oil circuit and a second oil circuit, which are connected to a bridge circuit consisting of four check 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 backward, the oil flows through the bridge circuit and always flows through the proportional relief valve (26) in one direction, thus realizing the bidirectional continuous reversing test of the tested servo motor pump.

2. The servo motor pump performance testing system capable of continuous commutation according to claim 1, characterized in that: The bridge circuit consists of check valve I (24.1), check valve II (24.2), check valve III (24.3) and check valve IV (24.4); the first oil circuit is connected to the bridge node between check valve I and check valve III, the second oil circuit is connected to the bridge node between check valve II and check valve IV, the bridge node between check valve I and check valve II is connected to the proportional relief valve (26) and then connected to the return oil tank (1), and the bridge node between check valve III and check valve IV is connected to the return oil tank (1).

3. The servo motor pump performance testing system capable of continuous commutation 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 the first oil circuit and the second oil circuit to realize bidirectional continuous no-load testing of the motor pump; an electromagnetic on / off valve (28.1) is connected in parallel at both ends of the proportional relief valve (26) to control the load pressure to either no-load or load-bearing test states.

4. The servo motor pump performance testing system capable of continuous commutation according to claim 3, characterized in that: In the hydraulic loading module, a high-pressure safety valve (27) is 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 the oil, measure the flow rate and cool it, 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 testing system capable of continuous commutation according to claim 1, characterized in that: In the oil replenishment module, a cooler (36) and a low-pressure filter (5.1) are connected to the oil replenishment line output from the oil replenishment pump (3) to cool and filter the hydraulic oil flowing through it, 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 to the return oil tank (1) through the proportional overflow valve (6) to adjust the replenishment pressure.

6. The servo motor pump performance testing system capable of continuous commutation 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 and second oil circuits in the hydraulic loading module through two solenoid valves, respectively. The solenoid valves control the on / off state of the oil circuits at both ends of the tested servo motor pump.

7. The servo motor pump performance testing system capable of continuous commutation according to claim 1, characterized in that: When there are multiple test servo motor pumps, each test servo motor pump is equipped with a solenoid valve I, and all test servo motor pumps share a solenoid valve II.

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

9. The servo motor pump performance testing system capable of continuous commutation according to claim 1, characterized in that: The drive control unit includes two control methods: one through a frequency converter and the other through a DC power supply and drive controller, to drive and control the tested servo motor pump.

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