Multi-stage pressure conversion hydraulic device integrated on oil pump

Abstract

The utility model discloses a multistage pressure conversion hydraulic device integrated on an oil pump, which comprises a first oil pipe connected with an oil outlet pipeline of the oil pump, the first oil pipe is provided with a first damping hole and a second damping hole, and the first oil pipe between the first damping hole and the second damping hole is connected with a second oil pipe. The second oil pipe is connected with a control port X of the oil pump, the aperture of the first damping hole is smaller than that of the second damping hole, the first oil pipe is connected with the oil tank, and an electromagnetic valve is arranged on the first oil pipe between the oil tank and the second damping hole. Compared with the prior art, the two damping holes with different hole diameters in the first oil pipe are matched, so that control oil of the second oil pipe and hydraulic oil of the oil outlet pipeline generate pressure difference at the two ends of the first damping hole, then the starting pressure of the oil pump is adjusted according to a pressure difference signal, low-pressure starting is achieved, and the starting mode is small in oil discharge amount and low in cost. The calorific value is small. And when the electromagnetic valve is closed, the impact vibration is small.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pump manufacturing, in particular to a hydraulic device with multi-stage pressure transformation integrated on an oil pump. Background Art

[0002] Refer to the attached Figure 1 , before the oil pump starts, the electromagnetic overflow valve YV1 is energized to lead the oil circuit to the fuel tank. At this time, the flow rate back to the fuel tank is large and the heat generation is large. Start the oil pump to achieve zero-pressure start, and then the electromagnetic overflow valve YV1 loses power to establish oil pressure. The outlet of the original oil pump usually uses an overflow valve or an electromagnetic overflow valve to ensure the safety pressure of the system. The flow rate back to the fuel tank is large, the impact and vibration are large during switching, and the heat generation is large during low-pressure standby. Content of the Utility Model

[0003] The utility model provides a hydraulic device with multi-stage pressure transformation integrated on an oil pump, which is used to solve the problems of large flow rate back to the fuel tank, large impact and vibration during switching, and large heat generation during low-pressure standby when the existing oil pump uses an overflow valve to ensure the safety pressure of the system.

[0004] The utility model provides a hydraulic device with multi-stage pressure transformation integrated on an oil pump, including a first oil pipe connected to the oil outlet pipeline of the oil pump. The first oil pipe is provided with a first damping hole and a second damping hole. A second oil pipe is connected to the first oil pipe between the first damping hole and the second damping hole. The second oil pipe is connected to the control port X of the oil pump. The aperture of the first damping hole is smaller than that of the second damping hole. The first oil pipe is connected to the fuel tank, and an electromagnetic valve is provided on the first oil pipe between the fuel tank and the second damping hole.

[0005] Preferably, it further includes an integrated block arranged on the oil pump. The first oil pipe, the second oil pipe, the first damping hole, the second damping hole and the electromagnetic valve are all arranged in the integrated block.

[0006] Preferably, the integrated block is fixed on the oil outlet of the oil pump by bolts.

[0007] Preferably, the electromagnetic valve is an electromagnetic directional valve. The fuel tank is connected to the T port of the electromagnetic directional valve. The first oil pipe is connected to the P port of the electromagnetic directional valve. The electromagnetic directional valve is connected to a low-pressure overflow valve.

[0008] Preferably, it further includes a high-pressure overflow valve connected in parallel with the low-pressure overflow valve.

[0009] Preferably, the electromagnetic valve is an electromagnetic directional valve. The fuel tank is connected to the T port of the electromagnetic directional valve. The first oil pipe is connected to the P port of the electromagnetic directional valve. The electromagnetic directional valve is connected to a proportional regulating valve.

[0010] Preferably, the second oil pipe is a steel pipe.

[0011] Compared with the prior art, through the cooperation of two damping holes with different apertures on the first oil pipe, the utility model enables the control oil of the second oil pipe and the hydraulic oil of the oil outlet pipeline to generate a pressure difference at both ends of the first damping hole, and then adjusts the starting pressure of the oil pump according to the pressure difference signal to achieve low-pressure starting. This starting method has a small oil discharge volume and low heat generation. Due to the setting of the two damping holes, a small amount of the oil output by the oil pump enters the fuel tank. When the solenoid valve is closed, the impact and vibration are small. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 is a structural schematic diagram of the prior art;

[0014] Figure 2 is a structural schematic diagram of the present utility model.

[0015] Reference numerals:

[0016] 1. Oil pump, 2. Oil outlet pipeline, 3. First oil pipe, 4. First damping hole, 5. Second damping hole, 6. Second oil pipe, 7. Fuel tank, 8. Solenoid valve, 9. Low-pressure overflow valve, 10. High-pressure overflow valve, 11. Pressure gauge, 12. Electromagnetic overflow valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model with reference to the drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present utility model.

[0018] Embodiment 1

[0019] Referring to the attached Figure 2, this embodiment provides a hydraulic device with multi-stage pressure transformation integrated on an oil pump, including a first oil pipe 3 connected to the oil outlet pipeline 2 of the oil pump 1. A first damping hole 4 and a second damping hole 5 are provided on the first oil pipe 3. A second oil pipe 6 is connected to the first oil pipe 3 between the first damping hole 4 and the second damping hole 5. The second oil pipe 6 is connected to the control port X of the oil pump 1. The aperture of the first damping hole 4 is smaller than that of the second damping hole 5. The first oil pipe 3 is connected to the fuel tank 7. An electromagnetic valve 8 is provided on the first oil pipe 3 between the fuel tank 7 and the second damping hole 5. When the oil pump 1 starts, the oil outlet pipeline 2 and the control port X of the oil pump 1 discharge oil. The oil from the control port X flows into the second oil pipe 6 and flows through the second damping hole 5 and the electromagnetic valve 8 to the fuel tank 7. The oil from the oil outlet pipeline 2 flows through the first damping hole 4, the second damping hole 5, and the electromagnetic valve 8 to the fuel tank 7. Since the aperture of the first damping hole 4 is smaller than that of the second damping hole 5 (more hydraulic oil in the second oil pipe 6 flows out through the second damping hole 5, and less hydraulic oil from the oil outlet pipeline 2 is supplemented to the second oil pipe 6 through the first damping hole 4), a pressure difference appears at both ends of the first damping hole 4 for the hydraulic oil in the oil outlet pipeline 2 and the second oil pipe 6. A low-pressure starting pressure is generated by controlling the main pump variable according to the pressure difference signal. For example, a low-pressure starting pressure of 1.4 MPa is generated, thus realizing low-pressure starting. Since it is low-pressure starting, the flow rate of the hydraulic oil returning to the fuel tank 7 is small and the heat generation is small. When the electromagnetic valve 8 is closed, the impact and vibration are small.

[0020] As another implementation manner of the present utility model: This embodiment further includes an integrated block provided on the oil pump 1. The first oil pipe 3, the second oil pipe 6, the first damping hole 4, the second damping hole 5, and the electromagnetic valve 8 are all arranged inside the integrated block, and the oil outlet pipeline 2 extends outside the integrated block.

[0021] An implementation manner of mounting the integrated block on the oil pump 1: The integrated block is fixed to the oil outlet of the oil pump 1 by bolts.

[0022] As another implementation manner of the present utility model: The electromagnetic valve 8 is an electromagnetic directional valve. The fuel tank 7 is connected to the T port of the electromagnetic directional valve, the first oil pipe 3 is connected to the P port of the electromagnetic directional valve, and the A port and the B port of the electromagnetic directional valve are respectively connected to the inlet and outlet ports of a low-pressure relief valve 9. The low-pressure relief valve 9 is arranged inside the integrated block. This structural design can meet the low-pressure working conditions.

[0023] As another embodiment of the present utility model: This embodiment further includes a high-pressure relief valve 10 connected in parallel with the low-pressure relief valve 9. The low-pressure relief valve 9 and the high-pressure relief valve 10 are connected in parallel between the first oil pipe and the second oil pipe. The first oil pipe and the second oil pipe are respectively connected to the A port and the B port of the electromagnetic directional valve. The high-pressure relief valve 10, the first oil pipe and the second oil pipe are all arranged in the integrated block. This structural design facilitates the realization of high-low pressure switching to meet different working conditions. The present utility model realizes low-pressure start-up and can also achieve multi-stage pressure transformation by adding an integrated block developed by itself at the valve block outlet to replace the original pump outlet relief valve. Compared with directly purchasing an imported oil pump 1 with pressure switching, it can effectively reduce costs.

[0024] As another embodiment of the present utility model: The second oil pipe 6 is a steel pipe.

[0025] As another embodiment of the present utility model: This embodiment further includes a pressure gauge 11, and the oil pipe on the pressure gauge 11 is connected to the oil outlet pipeline 2 in the integrated block.

[0026] Embodiment 2:

[0027] This embodiment is basically the same as Embodiment 1, except that:

[0028] The solenoid valve 8 is an electromagnetic directional valve. The fuel tank 7 is connected to the T port of the electromagnetic directional valve. The first oil pipe 3 is connected to the P port of the electromagnetic directional valve. The A port and the B port of the electromagnetic directional valve are respectively connected to the oil inlet and outlet ports of the proportional regulating valve. The proportional regulating valve is arranged in the integrated block. The present utility model can be combined as needed to meet various customer requirements.

[0029] Finally, it should be noted that: The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: They can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A multi-stage pressure conversion hydraulic device integrated on an oil pump, characterized in that: The invention comprises a first oil pipe connected to the oil outlet pipeline of the oil pump, wherein the first oil pipe is provided with a first damping hole and a second damping hole, the first oil pipe between the first damping hole and the second damping hole is connected with a second oil pipe, the second oil pipe is connected to a control port X of the oil pump, the aperture of the first damping hole is smaller than the aperture of the second damping hole, the first oil pipe is connected to an oil tank, and an electromagnetic valve is provided on the first oil pipe between the oil tank and the second damping hole.

2. The hydraulic device with multi-stage pressure conversion integrated on the oil pump according to claim 1, characterized in that: It also includes an integrated block arranged on the oil pump, wherein the first oil pipe, the second oil pipe, the first damping hole, the second damping hole and the solenoid valve are all arranged in the integrated block.

3. The multi-stage pressure conversion hydraulic device integrated on the oil pump according to claim 2, characterized in that: The integrated block is fixed on the oil outlet of the oil pump by means of bolts.

4. The hydraulic device with multi-stage pressure conversion integrated on the oil pump according to claim 3, characterized in that: The solenoid valve is a solenoid reversing valve, the oil tank is connected to the T port of the solenoid reversing valve, the first oil pipe is connected to the P port of the solenoid reversing valve, and the solenoid reversing valve is connected to the low-pressure relief valve.

5. The multi-stage pressure conversion hydraulic device integrated on the oil pump according to claim 4, characterized in that: Also included is a high-pressure relief valve connected in parallel with the low-pressure relief valve.

6. The multi-stage pressure conversion hydraulic device integrated on the oil pump according to claim 3, characterized in that: The solenoid valve is a solenoid reversing valve, the oil tank is connected to the T port of the solenoid reversing valve, the first oil pipe is connected to the P port of the solenoid reversing valve, and the solenoid reversing valve is connected to the proportional regulating valve.

7. The multi-stage pressure conversion hydraulic device integrated on the oil pump according to claim 5 or 6, characterized in that: The second oil pipe is a steel pipe.

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