Safety pressure setting device for proportional valve of oil pump

Abstract

The utility model discloses an oil pump proportional valve safety pressure setting device which comprises a positioning mechanism used for positioning, installing and fixing an oil pump proportional valve and a pressure setting mechanism communicated with the oil pump proportional valve to set the safety pressure of the oil pump proportional valve. The pressure setting mechanism comprises an oil tank, a hydraulic pump, a variable frequency motor and a servo electric cylinder, a liquid inlet of the hydraulic pump is communicated with the oil tank through a pipeline, a liquid outlet of the hydraulic pump is communicated with a working oil inlet A of the oil pump proportional valve through a pipeline, a working oil return port B of the oil pump proportional valve is communicated with the oil tank through a pipeline, and the variable frequency motor is in power connection with the hydraulic pump. The servo electric cylinder is erected on one side of the oil pump proportional valve, a push rod of the servo electric cylinder can stretch into a main oil inlet P of the oil pump proportional valve, and a spring check ring is arranged in the oil pump proportional valve P in a driving and sliding mode through the push rod of the servo electric cylinder so as to press a spring in the oil pump proportional valve. The oil pump proportional valve can meet the requirements of users with high safety pressure requirements on the oil pump proportional valve, meanwhile, the qualification rate is improved, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to a safety pressure setting device for an oil pump proportional valve, belonging to the technical field of automobile solenoid valve assembly. Background Art

[0002] The oil pump proportional valve is an electromagnetic proportional valve that controls the displacement of the oil pump in the lubrication system of the car. When the solenoid valve coil fails, the oil pump can also open the valve through pressure to allow the solenoid valve to continue working to keep the car running normally. The safety pressure of the oil pump proportional valve is designed for this need. At the same time, the size of the safety pressure shoulders the mission of energy saving. The higher the safety pressure, the higher the energy consumption for the car. Therefore, it is very important to be able to accurately set the safety pressure of the oil pump proportional valve. If the safety pressure setting qualified range is relatively large, it will undoubtedly increase the energy consumption of the car.

[0003] like Figure 1 As shown, the current safety pressure setting device for the oil pump proportional valve controls the compression of the spring by controlling the moving distance of a cylinder to achieve the purpose of setting the safety pressure of the oil pump proportional valve. Its advantages are simple structure and low cost, which are favored by manufacturers. However, with the development of the automobile industry, automobile manufacturers' requirements for energy consumption are also constantly increasing, so the requirements for low energy consumption are getting higher and higher, so the requirements for the setting deviation range of the safety pressure will also become smaller. The current safety pressure setting device for the oil pump proportional valve has the following problems:

[0004] First, the set safety pressure value has a large deviation, which is mainly caused by the deviation of processed parts, especially springs, which ultimately leads to a low pass rate. For manufacturers, the scrap rate is high and the production cost increases.

[0005] Second, as the parts controlling the spring compression wear, the spring compression decreases, causing the set safety pressure to become lower and the accuracy to decrease.

[0006] Third, when the parts that control the spring compression amount are worn (affecting the safety pressure setting value), in order to restore normal operation, it is necessary to frequently adjust the cylinder stroke, affecting production. Utility Model Content

[0007] The utility model aims to solve the shortcomings of the existing oil pump proportional valve safety pressure setting device and proposes an oil pump proportional valve safety pressure setting device.

[0008] In order to achieve the above object, the utility model provides a safety pressure setting device for an oil pump proportional valve, comprising:

[0009] Positioning mechanism, used for positioning and installing the fixed oil pump proportional valve;

[0010] The pressure setting mechanism is connected to the oil pump proportional valve to set the safety pressure of the oil pump proportional valve.

[0011] Preferably, the pressure setting mechanism includes an oil tank, a hydraulic pump, a variable frequency motor and a servo electric cylinder. The hydraulic pump inlet is connected to the oil tank through a pipeline, the hydraulic pump outlet is connected to the working oil inlet A of the oil pump proportional valve through a pipeline, the working oil return port B of the oil pump proportional valve is connected to the oil tank through a pipeline, the variable frequency motor is power-connected to the hydraulic pump, the servo electric cylinder is mounted on one side of the oil pump proportional valve and the push rod of the servo electric cylinder can be extended into the main oil inlet P of the oil pump proportional valve, and a spring retaining ring is provided in the P port of the oil pump proportional valve, which is driven to slide by the servo electric cylinder push rod to press the spring in the oil pump proportional valve.

[0012] Furthermore, the hydraulic pump is connected to the oil pump proportional valve via a valve block, and the valve block is an oil circuit block equipped with a pressure sensor.

[0013] Furthermore, a filter is connected between the hydraulic pump and the oil pump proportional valve, and an air filter is provided on the top of the oil tank.

[0014] Furthermore, a visual liquid level gauge is arranged on one side wall of the oil tank, and a liquid level switch is arranged on one side wall of the oil tank close to the bottom.

[0015] Preferably, the positioning mechanism includes a mounting seat, a mounting tool, a bracket, a movable cylinder and a clamping cylinder. The oil pump proportional valve is fixed on the mounting seat and connected to the mounting tool. The mounting tool is an oil circuit block compatible with the oil pump proportional valve. The bracket is arranged on the mounting seat. The clamping cylinder lifting and lowering arrangement is between the bracket and the mounting seat. The telescopic rod of the clamping cylinder is used to clamp the rear end of the oil pump proportional valve. The movable cylinder is arranged on the bracket to drive the lifting and lowering of the clamping cylinder.

[0016] Furthermore, a sensor for detecting whether the oil pump proportional valve is installed in place is arranged on the mounting seat, and the sensor is connected with the movable cylinder, the clamping device and the pressure setting mechanism by signal.

[0017] Preferably, the oil pump proportional valve is provided with a pressure sensor and a switch valve which are signal-connected to the positioning mechanism and the pressure setting mechanism, and two pressure sensors are provided and are respectively connected to the working oil inlet A and the working oil outlet B of the oil pump proportional valve.

[0018] The utility model provides a safety pressure setting device for an oil pump proportional valve, which has the following advantages:

[0019] 1. The oil pump proportional valve safety pressure setting device of the utility model improves the accuracy of setting the safety pressure value of the oil pump proportional valve and reduces the setting deviation. It solves the deviation caused by the deviation of the processed parts, improves the qualified rate, reduces the scrap rate, and reduces the production cost.

[0020] 2. The safety pressure setting device for the oil pump proportional valve of the utility model solves the problem that the spring compression is reduced due to the wear of the parts controlling the spring compression, resulting in a lower set safety pressure.

[0021] 3. The safety pressure setting device of the oil pump proportional valve of the utility model eliminates the need to frequently adjust the cylinder stroke in order to restore normal operation when the control spring compression part is worn (affecting the safety pressure setting value).

[0022] 4. The safety pressure setting device of the oil pump proportional valve of the utility model monitors the setting result while setting until the safety pressure target value is reached. The setting method itself determines the high accuracy of the safety pressure setting value, and it is a closed-loop control system with feedback effect. When the system has a closed-loop control function, it can compensate for the errors caused by the processing differences of springs and other parts. When the spring elasticity is insufficient, the spring will be compressed more, and vice versa. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The structural diagram of the core part of the existing safety pressure setting device;

[0024] Figure 2 This is a structural schematic diagram of a safety pressure setting device for an oil pump proportional valve of the utility model;

[0025] Figure 3 This is a schematic diagram of the connection between the oil pump proportional valve and the installation tooling;

[0026] Figure 4 This is a structural diagram of a safety pressure setting device for an oil pump proportional valve of the utility model, which mainly reflects the connection relationship between the oil pump proportional valve and the positioning mechanism;

[0027] Figure 5 This is a hydraulic principle diagram of a safety pressure setting device for an oil pump proportional valve of the utility model;

[0028] In the figure:

[0029] 1-positioning mechanism; 11-mounting seat; 12-installation tooling; 13-bracket; 14-moving cylinder; 15-pressing cylinder; 2-pressure setting mechanism; 21-oil tank; 22-hydraulic pump; 23-frequency conversion motor; 24-servo electric cylinder; 3-filter; 4-valve block; 5-air filter; 6-visual level gauge; 7-liquid level switch; 8-sensor; 9-pressure sensor; 10-switch valve; 16-oil pump proportional valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technical personnel in the field without creative work are within the scope of protection of the present utility model.

[0031] Reference Figure 2-Figure 5 A safety pressure setting device for an oil pump proportional valve comprises a positioning mechanism 1 and a pressure setting mechanism 2. The positioning mechanism 1 is used to position and install a fixed oil pump proportional valve 16. The pressure setting mechanism 2 is arranged on one side of the positioning mechanism 1 and is connected to the oil pump proportional valve 16 to set the safety pressure of the oil pump proportional valve 16.

[0032] Reference Figure 2-Figure 4 The pressure setting mechanism 2 includes an oil tank 21, a hydraulic pump 22, a variable frequency motor 23 and a servo electric cylinder 24. The hydraulic pump 22 inlet is connected to the oil tank 21 through an oil suction pipeline, the hydraulic pump 22 outlet is connected to the working oil inlet A of the oil pump proportional valve 16 through an oil outlet pipeline, and the working oil return port B of the oil pump proportional valve 16 is connected to the oil tank 21 through an oil outlet pipeline. The variable frequency motor 23 is connected to the hydraulic pump 22 to drive the hydraulic pump 22 to work and realize the suction of the oil in the oil tank 21. The setting of the variable frequency motor 23 can realize the control of the suction flow rate by changing the speed. The servo electric cylinder 24 is mounted on one side of the oil pump proportional valve 16 and the push rod of the servo electric cylinder 24 can be extended into the main oil inlet P of the oil pump proportional valve 16. A spring retaining ring is set in the P port of the oil pump proportional valve 16 through the servo electric cylinder 24 push rod to drive the sliding to press the spring in the oil pump proportional valve 16, and then the pressure of the P port of the oil pump proportional valve 16 reaches the required safety pressure value through the pressing.

[0033] Furthermore, a filter 3 is connected between the hydraulic pump 22 and the oil pump proportional valve 16 for filtering impurities in the output oil to ensure the cleanliness of the oil. The filter 3 is connected to the oil pump proportional valve 16 through a valve block 4. The valve block 4 is an oil circuit block equipped with a pressure sensor 9. An air filter 5 connected to the atmosphere is installed on the top of the oil tank 21 to filter the air.

[0034] Furthermore, a visual liquid level gauge 6 is installed on the side wall of the oil tank 21 to facilitate observation of the liquid level height of the oil tank 21, and a liquid level switch 7 is installed on the side wall of the oil tank 21 near the bottom to provide a liquid level high and low alarm for the convenience of staff control. In this embodiment, the installation and use of the liquid level switch 7 are existing technologies and will not be elaborated on.

[0035] Reference Figure 2-Figure 5The positioning mechanism 1 includes a mounting seat 11, a mounting tool 12, a bracket 13, a moving cylinder 14 and a clamping cylinder 15. The oil pump proportional valve 16 is fixed on the mounting seat 11 and connected to the mounting tool 12. The mounting tool 12 is an oil circuit block adapted to the oil pump proportional valve 16. In this embodiment, the connection between the oil circuit block and the oil pump proportional valve 16 is a prior art and will not be described in detail. The bracket 13 is mounted on the mounting seat 11, and the clamping cylinder 15 is lifted and installed between the bracket 13 and the mounting seat 11. When the clamping cylinder 15 is lifted and lowered to face the oil pump proportional valve 16, the telescopic rod of the clamping cylinder 15 is used to clamp the rear end of the oil pump proportional valve 16 to prevent the oil pump proportional valve 16 from being ejected when the pressure is set. The moving cylinder 14 is mounted on the bracket 13 to drive the lifting and lowering of the clamping cylinder 15.

[0036] Furthermore, a sensor 8 for detecting whether the oil pump proportional valve 16 is installed in place is installed on the mounting seat 11. The sensor 8 is signal-connected with the movable cylinder 14, the clamping device and the pressure setting mechanism 2. When the sensor 8 detects that the oil pump proportional valve 16 is installed in place and the starting device sets the pressure, otherwise, the device is not allowed to start when there is no product.

[0037] Reference Figure 2 and Figure 3 The oil pump proportional valve 16 is equipped with a pressure sensor 9 and a switch valve 10 which are connected to the positioning mechanism 1 and the pressure setting mechanism 2. Two pressure sensors 9 are installed and are respectively connected to the working oil inlet A and the working oil outlet B of the oil pump proportional valve 16 to sense the oil inlet and outlet pressures of the oil pump proportional valve 16. The switch valve 10 can control the on and off of the oil source in time according to the pressure in the oil pump proportional valve 16 to complete the setting of the safety pressure.

[0038] The working principle of the safety pressure setting device of the oil pump proportional valve of the utility model is as follows:

[0039] After the oil pump proportional valve 16 is installed in the device, the telescopic rod of the mobile cylinder 14 moves downward, and the pressing cylinder 15 presses the rear end of the oil pump proportional valve 16, the hydraulic system starts, the frequency conversion motor 23 and the hydraulic pump 22 are directly connected, and the frequency conversion motor 23 drives the impeller in the hydraulic pump 22 to rotate to output the oil in the oil tank 21. The higher the speed, the greater the output flow or pressure, and vice versa. The output oil source passes through the pipeline, the filter 3, and the valve block 4, and then is input into the oil pump proportional valve 16, and then the servo electric cylinder 24 pushes the spring retaining ring. When the pressure at the P port of the oil pump proportional valve 16 reaches the required value, the servo electric cylinder 24 stops moving, and the safety pressure setting is completed.

[0040] The above is only a preferred embodiment of the utility model, and is not any formal or substantial limitation of the utility model. It should be pointed out that ordinary technicians in this technical field can make some improvements and supplements without departing from the utility model, and these improvements and supplements should also be regarded as the protection scope of the utility model. Any technician familiar with this profession can make some changes, modifications and equivalent changes made by using the technical content disclosed above without departing from the spirit and scope of the utility model, which are all equivalent embodiments of the utility model; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the utility model are still within the scope of the technical solution of the utility model.

Claims

1. A safety pressure setting device for an oil pump proportional valve, characterized in that: include: A positioning mechanism (1) for positioning and installing a fixed oil pump proportional valve (16); The pressure setting mechanism (2) is connected to the oil pump proportional valve (16) to set the safety pressure of the oil pump proportional valve (16).

2. A safety pressure setting device for an oil pump proportional valve according to claim 1, characterized in that: The pressure setting mechanism (2) comprises an oil tank (21), a hydraulic pump (22), a variable frequency motor (23) and a servo electric cylinder (24); the liquid inlet of the hydraulic pump (22) is connected to the oil tank (21) through a pipeline; the liquid outlet of the hydraulic pump (22) is connected to the working oil inlet A of the oil pump proportional valve (16) through a pipeline; the working oil return port B of the oil pump proportional valve (16) is connected to the oil tank (21) through a pipeline; the variable frequency motor (23) is connected to the hydraulic pump (22) by power; the servo electric cylinder (24) is mounted on one side of the oil pump proportional valve (16) and the push rod of the servo electric cylinder (24) can extend into the main oil inlet P of the oil pump proportional valve (16); a spring retaining ring is provided in the P port of the oil pump proportional valve (16) to press the spring in the oil pump proportional valve (16) by driving the push rod of the servo electric cylinder (24) to slide.

3. A safety pressure setting device for a proportional valve of an oil pump as claimed in claim 2, characterized in that: The hydraulic pump (22) is connected to the oil pump proportional valve (16) via a valve block (4), and the valve block (4) is an oil circuit block equipped with a pressure sensor (9).

4. A safety pressure setting device for a proportional valve of an oil pump as claimed in claim 2, characterized in that: A filter (3) is connected between the hydraulic pump (22) and the oil pump proportional valve (16), and an air filter (5) is provided on the top of the oil tank (21).

5. The oil pump proportional valve safety pressure setting device according to claim 2, characterized in that: A visual liquid level gauge (6) is arranged on one side wall of the oil tank (21), and a liquid level switch (7) is arranged on one side wall of the oil tank (21) close to the bottom.

6. The oil pump proportional valve safety pressure setting device according to claim 1, characterized in that: The positioning mechanism (1) comprises a mounting seat (11), a mounting tool (12), a bracket (13), a movable cylinder (14) and a clamping cylinder (15); an oil pump proportional valve (16) is fixed on the mounting seat (11) and connected to the mounting tool (12); the mounting tool (12) is an oil circuit block adapted to the oil pump proportional valve (16); the bracket (13) is arranged on the mounting seat (11); the clamping cylinder (15) is arranged between the bracket (13) and the mounting seat (11); a telescopic rod of the clamping cylinder (15) is used to clamp the rear end of the oil pump proportional valve (16); and the movable cylinder (14) is arranged on the bracket (13) and is used to drive the clamping cylinder (15) to rise and fall.

7. A safety pressure setting device for a proportional valve of an oil pump as claimed in claim 6, characterized in that: The mounting seat (11) is provided with a sensor (8) for detecting whether the oil pump proportional valve (16) is installed in place, and the sensor (8) is connected to the movable cylinder (14), the clamping device and the pressure setting mechanism (2) by signal.

8. The oil pump proportional valve safety pressure setting device according to claim 1, characterized in that: The oil pump proportional valve (16) is provided with a pressure sensor (9) and a switch valve (10) which are connected to the positioning mechanism (1) and the pressure setting mechanism (2) in terms of signals. Two pressure sensors (9) are provided and are respectively connected to the working oil inlet A and the working oil outlet B of the oil pump proportional valve (16).

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