Hydraulic test bed energy recovery system and energy-saving control method thereof

Abstract

The invention relates to a hydraulic test bed energy recovery system and an energy-saving control method thereof. The technical problem that existing motor testing cost is high is solved. Comprising a main energy motor and a main energy pump in control communication with the main energy motor, one side of the main energy pump is provided with an oil supply pipeline, the oil supply pipeline is provided with a tested motor and a main load pump which are arranged in parallel, and the side, away from the tested motor, of the oil supply pipeline is provided with a safety valve which is arranged in parallel with the tested motor; and a pressure adjusting structure is arranged between the tested motor and the main load pump. The system has the advantages that the tested motor and the main load pump form a main flow circulation ring, the displacement of the tested motor is kept to be slightly 1.1-1.4 times larger than that of the main load pump, and the energy-saving effect of the energy-saving rate of the system is guaranteed. A user can conveniently and directly adjust the system pressure through the pressure adjusting structure, and the high-pressure operation state of the system is guaranteed. The whole system is simple in structure, the equipment cost is reduced, the energy-saving rate of the system is high, the energy consumption can be effectively reduced, and the test cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic equipment, and in particular relates to an energy recovery system of a hydraulic test bench and an energy-saving control method thereof. Background Art

[0002] In the manufacturing field of hydraulic motors, pumps and reducers, life assessment of prototypes under high-speed, high-pressure and heavy-load conditions is an essential part of the product development process. Especially for large products, their high load requirements make companies face a double dilemma when developing new products: on the one hand, huge energy consumption leads to soaring costs; on the other hand, in order to meet the testing requirements, expensive equipment needs to be purchased, further increasing the burden of investment costs. Summary of the invention

[0003] The purpose of the present invention is to provide an energy recovery system for a hydraulic test bench in view of the above problems.

[0004] Another object of the present invention is to provide an energy-saving control method for an energy recovery system of a hydraulic test bench in order to solve the above-mentioned problem.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a hydraulic test bench energy recovery system comprises a main energy motor and a main energy pump which is control-connected to the main energy motor, an oil supply pipeline is provided on one side of the main energy pump, a test motor and a main load pump which are arranged in parallel are arranged on the oil supply pipeline, and a safety valve which is arranged in parallel with the test motor is provided on the side of the oil supply pipeline away from the test motor, a pressure regulating structure is provided between the test motor and the main load pump, the hydraulic oil of the main energy pump can be transmitted to the test motor and the main load pump through the oil supply pipeline, and the hydraulic pressure in the oil supply pipeline can be detected by installing a valve, the safety valve is in a closed state under normal circumstances, and when the pressure in the oil supply pipeline is greater than the set pressure of the safety valve, the installation valve is opened to release the pressure to ensure the safety of the system.

[0006] In the above-mentioned energy recovery system of a hydraulic test bench, the pressure regulating structure includes an auxiliary pump, the auxiliary pump is provided with a loading pressure valve capable of regulating the system pressure, and one side of the auxiliary pump is connected to the test motor through a transfer case, and one side of the transfer case is provided with a main load pump arranged in parallel with the auxiliary pump, or the auxiliary pump is directly connected to the main load pump in a series pump manner to form a series pump structure, the test motor is connected to the series pump structure, and the auxiliary pump can output supplementary pressure to the loading pressure valve alone to ensure the pressurization effect of the loading pressure valve.

[0007] In the above-mentioned energy recovery system of a hydraulic test bench, the test motor has a test motor input end connected to the oil supply pipeline, and a test motor output end is provided on one side of the test motor, and the test motor output end is connected to the transfer case, or the test motor output end is connected to the series pump structure.

[0008] In the above-mentioned hydraulic test bench energy recovery system, the main load pump has a main load pump input end connected to the oil supply pipeline, and one side of the main load pump is provided with a main load pump output end connected to the transfer case, so that the hydraulic oil of the oil supply pipeline can be easily received through the main load pump input end.

[0009] A hydraulic test bench energy recovery system and an energy-saving control method thereof, the method comprising the following steps:

[0010] Step S1: the main energy motor drives the main energy pump to supply oil into the oil supply pipeline;

[0011] Step S2: obtaining the speed of the motor under test;

[0012] Step S3: adjusting the system pressure to achieve high speed and high pressure test conditions for the motor under test, and obtaining the energy recovery energy saving rate;

[0013] In the above-mentioned hydraulic test bench energy recovery system and energy-saving control method thereof, in step S1, the hydraulic oil in the oil supply pipeline flows to the test motor, the main load pump and the safety valve respectively, and a main flow circulation loop is formed between the test motor and the main load pump to ensure that the displacement of the test motor is approximately 1.1 to 1.4 times greater than the displacement of the main load pump.

[0014] In the above-mentioned hydraulic test bench energy recovery system and energy-saving control method thereof, when the main energy pump supplies oil to the system to generate pressure, under the condition that the pressure at the input end of the test motor and the output end of the main load pump is the same, the output torque of the test motor is slightly greater than the input torque of the main load pump, and the test motor, the main load pump and the auxiliary pump rotate; the driven main load pump supplies oil to the input end of the test motor through the oil supply pipeline, and the main energy pump also supplies oil to the input end of the test motor.

[0015] In the above-mentioned energy recovery system of a hydraulic test bench and its energy-saving control method, in step S2, since the displacement of the main load pump is close to the tested motor, the main flow that makes the tested motor rotate comes from the main load pump, and the speed of the tested motor depends on the flow output from the main energy pump to the system, and the relationship is:

[0016]

[0017] In the above-mentioned energy recovery system of a hydraulic test bench and its energy-saving control method, in step S2, when the main energy pump outputs a fixed flow, the tested motor completes the speed control according to the above relationship, and the system pressure at this time depends on the sum of all mechanical losses of the tested motor, the main load pump, and the auxiliary pump; and the rotational resistance torque M0 of the tested motor and the main load pump is almost small, and the system pressure under no loading condition is relatively low, and the loading relationship is as follows:

[0018] The torque formula of the tested motor or main energy pump is: M = 0.159 × system pressure × motor or pump displacement;

[0019] Torque input of auxiliary pump: M5 = 0.159 × loading pressure × auxiliary pump displacement;

[0020] Total rotational resistance torque on the loading side: m = M5 + M0;

[0021] When the loading pressure is 0, the system pressure is the no-load pressure under the no-load rotation resistance torque M0. When the loading pressure is increased to increase M5, the system pressure increases.

[0022]

[0023] In the above-mentioned hydraulic test bench energy recovery system and energy-saving control method thereof, in step S3, when the system pressure is lower than the safety valve, all the hydraulic oil passes through the test motor to achieve high-speed and high-pressure test conditions for the test motor, and the main energy pump only provides a flow rate = test motor speed × (test motor displacement - main load pump displacement).

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] 1. The tested motor and the main load pump form a main flow circulation loop, and the displacement of the tested motor is kept slightly larger than that of the main load pump by about 1.1 to 1.4 times to ensure the energy-saving effect of the system energy-saving rate.

[0026] 2. The pressure regulating structure enables users to directly adjust the system pressure to ensure the high-pressure operation of the system.

[0027] 3. The overall system structure is simple, the equipment cost is reduced, and the system energy saving rate is high, which can effectively reduce energy consumption and reduce testing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a system principle diagram of the first embodiment of the present invention.

[0029] Figure 2 It is a structural diagram of embodiment 2 of the present invention.

[0030] In the figure: main energy motor 1, main energy pump 2, oil supply pipeline 3, test motor 4, test motor input terminal 41, test motor output terminal 42, main load pump 5, main load pump input terminal 51, main load pump output terminal 52, safety valve 6, pressure regulating structure 7, auxiliary pump 71, loading pressure valve 72, transfer case 73, and series pump structure 8. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Embodiment 1

[0033] like Figure 1 As shown, a hydraulic test bench energy recovery system includes a main energy motor 1 and a main energy pump 2 which is controllably connected to the main energy motor 1. The main energy motor 1 can control the main energy pump 2 to output oil supply. An oil supply pipeline 3 is provided on one side of the main energy pump 2. A test motor 4 and a main load pump 5 which are arranged in parallel are arranged on the oil supply pipeline 3. A safety valve 6 which is arranged in parallel with the test motor 4 is provided on the side of the oil supply pipeline 3 away from the test motor 4. A pressure regulating structure 7 is provided between the test motor 4 and the main load pump 5. The hydraulic oil of the main energy pump 2 can be transmitted to the test motor 4 and the main load pump 5 through the oil supply pipeline 3. The hydraulic pressure in the oil supply pipeline 3 can be detected through the installation valve 6. The safety valve 6 is in a closed state under normal conditions. When the pressure in the oil supply pipeline 3 is greater than the set pressure of the safety valve 6, the installation valve 6 opens to release the pressure to ensure the safety of the system.

[0034] Specifically, the pressure regulating structure 7 includes an auxiliary pump 71, on which a loading pressure valve 72 capable of regulating the system pressure is provided, and one side of the auxiliary pump 71 is connected to the test motor 4 through a transfer case 73, and one side of the transfer case 73 is provided with a main load pump 5 arranged in parallel with the auxiliary pump 71. The torque changes of the auxiliary pump 71 and the main load pump 5 can be controlled by the transfer case 73, so that the pressure regulation of the system can be achieved, and the auxiliary pump 71 can output supplementary pressure to the loading pressure valve 72 alone to ensure the pressurization effect of the loading pressure valve 72.

[0035] Among them, the test motor 4 has a test motor input terminal 41 connected to the oil supply pipeline 3, and a test motor output terminal 42 is provided on one side of the test motor 4. The test motor output terminal 42 is connected to the transfer case 73. The transfer case 73 can adjust the transmitted speed and torque of the test motor 4 to meet the working requirements under different working conditions. The hydraulic oil in the oil supply pipeline 3 can be easily received through the test motor input terminal 41, and the hydraulic oil can drive the test motor 4 to rotate.

[0036] like Figure 1As shown, the main load pump 5 has a main load pump input end 51 connected to the oil supply pipeline 3, and a main load pump output end 52 connected to the transfer case 73 is provided on one side of the main load pump 5, so that the hydraulic oil of the oil supply pipeline 3 can be easily received through the main load pump input end 51.

[0037] like Figure 1 As shown, a hydraulic test bench energy recovery system and an energy-saving control method thereof, the method comprises the following steps:

[0038] Step S1: the main energy motor 1 drives the main energy pump 2 to supply oil into the oil supply pipeline 3;

[0039] Step S2: obtaining the rotation speed of the tested motor 4;

[0040] Step S3: adjusting the system pressure to achieve high speed and high pressure test conditions of the tested motor 4 to obtain the energy recovery energy saving rate;

[0041] Among them, in step S1, the hydraulic oil in the oil supply pipeline 3 flows to the test motor 4, the main load pump 5 and the safety valve 6 respectively, and a main flow circulation loop is formed between the test motor 4 and the main load pump 5 to ensure that the displacement of the test motor 4 is about 1.1 to 1.4 times greater than that of the main load pump 5. The closer the displacement of the test motor 4 is to the displacement of the main load pump 5, the higher the energy saving rate.

[0042] Specifically, when the main energy pump 2 supplies oil to the system to generate pressure, under the condition that the pressure at the test motor input terminal 41 and the main load pump output terminal 52 is the same, the test motor 4 output torque is slightly greater than the main load pump 5 input torque, and the test motor 4, the main load pump 5 and the auxiliary pump 71 rotate; the driven main load pump 5 supplies oil to the test motor input terminal 41 through the oil supply pipeline 3, and the main energy pump 2 also supplies oil to the test motor input terminal 41, thereby increasing the rotation speed of the test motor 4 and the torque of the test motor 4, so that the output torque of the test motor 4 is greater than the rotational resistance torque of the main load pump 5 + the motor's own rotational resistance torque.

[0043] like Figure 1 As shown, in step S2, since the displacement of the main load pump 5 is close to the tested motor 4, the main flow rate that makes the tested motor 4 rotate comes from the main load pump 5, and the speed of the tested motor 4 depends on the flow rate output to the system by the main energy pump 2, and the relationship is:

[0044]

[0045] Specifically, in step S2, when the main energy pump 2 outputs a fixed flow rate, the tested motor 4 completes the speed control according to the above relationship. At this time, the system pressure depends on the sum of all mechanical losses of the tested motor 4, the main load pump 5, and the auxiliary pump 71; while the rotation resistance torque M0 of the tested motor 4 and the main load pump 5 is almost small, and the system pressure under no loading condition is relatively low, and the loading relationship is as follows: The torque formula of the tested motor 4 or the main energy pump 2: M = 0.159 × system pressure × motor or pump displacement;

[0046] Torque input of the auxiliary pump 71: M5 = 0.159 × loading pressure × displacement of the auxiliary pump 71;

[0047] Total rotational resistance torque on the loading side: m = M5 + M0;

[0048] When the loading pressure is 0, the system pressure is the no-load pressure under the no-load rotation resistance torque M0. When the loading pressure is increased to increase M5, the system pressure increases.

[0049]

[0050] Among them, in step S3, when the system pressure is lower than the safety valve 6, all the hydraulic oil passes through the test motor 4, realizing the high-speed and high-pressure test conditions of the test motor 4, and the main energy pump 2 only provides a flow rate = the speed of the test motor 4 × (the displacement of the test motor 4-the displacement of the main load pump 5).

[0051] The principle of this embodiment is: to make the displacement of the tested motor 4 larger than that of the main load pump 5 by about 1.1 to 1.4 times, the closer the displacement of the tested motor 4 is to that of the main load pump 5, the higher the energy saving rate; to increase the system pressure through the pressure regulating structure 7 to ensure the high pressure state, and when the system pressure is lower than the safety valve 6, all the hydraulic oil passes through the tested motor 4, the speed of the tested motor 4 is increased and the output torque of the tested motor 4 can be increased, thereby achieving the high speed and high pressure test condition of the tested motor 4.

[0052] Embodiment 2

[0053] The structure and working principle of this embodiment are basically the same as those of the first embodiment, except that: Figure 1 , Figure 2 As shown, the auxiliary pump 71 is directly connected to the main load pump 5 through a series pump method to form a series pump structure 8. The output end 42 of the test motor is connected to the series pump structure 8. The series pump structure can be used in occasions with high requirements on structural compactness and high pressure. This connection method can realize the series connection of multiple pumps in a smaller space to meet the pressure requirements of the equipment.

[0054] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0055] Although this article uses more terms such as main energy motor 1, main energy pump 2, oil supply pipeline 3, tested motor 4, tested motor input terminal 41, tested motor output terminal 42, main load pump 5, main load pump input terminal 51, main load pump output terminal 52, safety valve 6, pressure regulating structure 7, auxiliary pump 71, loading pressure valve 72, transfer case 73, series pump structure 8, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A hydraulic test bench energy recovery system, comprising a main energy motor (1) and a main energy pump (2) connected to the main energy motor (1) by control, characterized in that: An oil supply pipeline (3) is provided on one side of the main energy pump (2), and a test motor (4) and a main load pump (5) are arranged in parallel on the oil supply pipeline (3). A safety valve (6) arranged in parallel with the test motor (4) is provided on the side of the oil supply pipeline (3) away from the test motor (4), and a pressure regulating structure (7) is provided between the test motor (4) and the main load pump (5).

2. The energy recovery system of a hydraulic test bench according to claim 1, characterized in that: The pressure regulating structure (7) comprises an auxiliary pump (71), the auxiliary pump (71) being provided with a loading pressure valve (72) capable of regulating the system pressure, and one side of the auxiliary pump (71) being connected to the tested motor (4) via a transfer case (73), and one side of the transfer case (73) being provided with a main load pump (5) arranged in parallel with the auxiliary pump (71), or the auxiliary pump (71) and the main load pump (5) being directly connected via a series pump mode to form a series pump structure (8), and the tested motor (4) being connected to the series pump structure (8).

3. The energy recovery system of a hydraulic test bench according to claim 2, characterized in that: The test motor (4) has a test motor input end (41) connected to the oil supply pipeline (3), and a test motor output end (42) is provided on one side of the test motor (4), and the test motor output end (42) is connected to the transfer case (73), or the test motor output end (42) is connected to the series pump structure (8).

4. The energy recovery system of a hydraulic test bench according to claim 2, characterized in that: The main load pump (5) has a main load pump input end (51) connected to the oil supply pipeline (3), and one side of the main load pump (5) is provided with a main load pump output end (52) connected to the transfer case (73).

5. A hydraulic test bench energy recovery system and energy-saving control method thereof according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: Step S1: the main energy motor (1) drives the main energy pump (2) to supply oil into the oil supply pipeline (3); Step S2: obtaining the rotation speed of the tested motor (4); Step S3: adjusting the system pressure to achieve high speed and high pressure test conditions for the motor under test (4) and obtaining the energy recovery energy saving rate.

6. The energy recovery system and energy-saving control method of a hydraulic test bench according to claim 5, characterized in that: In step S1, the hydraulic oil in the oil supply pipeline (3) flows to the tested motor (4), the main load pump (5) and the safety valve (6) respectively, and a main flow circulation loop is formed between the tested motor (4) and the main load pump (5), ensuring that the displacement of the tested motor (4) is about 1.1 to 1.4 times greater than the displacement of the main load pump (5).

7. The energy recovery system and energy-saving control method of a hydraulic test bench according to claim 6, characterized in that: When the main energy pump (2) supplies oil to the system to generate pressure, under the condition that the pressures at the input end (41) of the tested motor and the output end (52) of the main load pump are the same, the output torque of the tested motor (4) is slightly greater than the input torque of the main load pump (5), and the tested motor (4), the main load pump (5) and the auxiliary pump (71) rotate; the driven main load pump (5) supplies oil to the input end (41) of the tested motor through the oil supply pipeline (3), and at the same time, the main energy pump (2) also supplies oil to the input end (41) of the tested motor.

8. The energy recovery system and energy-saving control method of a hydraulic test bench according to claim 7, characterized in that: In step S2, since the displacement of the main load pump (5) is close to that of the tested motor (4), the main flow rate that causes the tested motor (4) to rotate comes from the main load pump (5), and the speed of the tested motor (4) depends on the flow rate output from the main energy pump (2) to the system, and the relationship is:

9. The energy recovery system and energy-saving control method of a hydraulic test bench according to claim 8, characterized in that: In step S2, when the main energy pump (2) outputs a fixed flow rate, the tested motor (4) completes the speed control according to the above relationship. At this time, the system pressure depends on the sum of all mechanical losses of the tested motor (4), the main load pump (5) and the auxiliary pump (71); and since the rotational resistance torque M0 of the tested motor (4) and the main load pump (5) is almost small, the system pressure under the unloaded condition is relatively low, and the loading relationship is as follows: The torque formula of the tested motor (4) or the main energy pump (2) is: M = 0.159 × system pressure × motor or pump displacement; Torque input of the auxiliary pump (71): M5 = 0.159 × loading pressure × displacement of the auxiliary pump (71); Total rotational resistance torque on the loading side: m = M5 + M0; When the loading pressure is 0, the system pressure is the no-load pressure under the no-load rotation resistance torque M0. When the loading pressure is increased to increase M5, the system pressure increases.

10. The energy recovery system and energy-saving control method of a hydraulic test bench according to claim 9, characterized in that: In step S3, when the system pressure is lower than the safety valve (6), all the hydraulic oil passes through the test motor (4), achieving high-speed and high-pressure test conditions for the test motor (4), while the main energy pump (2) only provides a flow rate = test motor (4) speed × (test motor (4) displacement - main load pump (5) displacement).

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