Hydraulic control system for a swash plate type piston pump

Abstract

The application discloses a swash plate type plunger pump hydraulic control system, and relates to the field of hydraulic control systems.The swash plate type plunger pump hydraulic control system adopts a cartridge valve structure, combines an energy accumulator and an unloading valve together, controls the swash plate change from the outside by introducing oil, and can have large or small flow.The system can flexibly control the swash plate of the swash plate type plunger pump, and can also provide stable pressure for the swash plate, so that fine adjustment of the swash plate angle can be realized, the flow can be reduced to about 10% of the original flow, energy consumption is saved, and cost is saved.The swash plate type plunger pump hydraulic control system has simple structure, flexible design, good controllability, extremely low cost, and convenient maintenance, is widely applied in various industries, and can promote the development of the field and bring considerable economic benefits;meanwhile, the size of the passageway of the corresponding cartridge valve combined parts can be adjusted according to actual conditions, the use range is wider, and the adaptability is stronger.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydraulic control system, and particularly relates to a swash plate type piston pump hydraulic control system. BACKGROUND

[0002] The hydraulic pump is a power element of the hydraulic transmission system, which is an energy conversion device for converting mechanical energy input by a prime mover into liquid pressure energy. In the hydraulic transmission system, the hydraulic pump belongs to a transmission device and is an important component of the hydraulic transmission system. At present, various hydraulic pumps exist, and according to structural classification, the hydraulic pumps mainly include gear pumps, vane pumps and piston pumps. In particular, the swash plate type piston pump has advantages of high efficiency, easy to realize stepless variable and change of oil delivery direction. However, the swash plate type piston pump generally relies on its own structure to operate, the swash plate is inherent, and the inclination angle of the swash plate is fixed, which leads to fixed opening specification of the swash plate type piston pump and inability to finely and flexibly adjust the opening specification. In addition, the inclination range of the swash plate is large, which leads to large opening of the swash plate type piston pump, large energy consumption in specific working places, no energy saving, and unstable pressure, which seriously limits the application range of the swash plate type piston pump. SUMMARY

[0003] The present application aims to provide a swash plate type piston pump hydraulic control system to solve the problem that the existing swash plate type piston pump generally relies on its own structure to operate and the inclination angle of the swash plate is fixed, thereby limiting the application range of the swash plate type piston pump.

[0004] To achieve the above-mentioned purpose, the present application provides the following solutions.

[0005] The present application provides a swash plate type piston pump hydraulic control system, which comprises a swash plate type piston pump and an accumulator. The accumulator is used to store hydraulic oil to supply oil to the system. The oil port of the accumulator is connected with an unloading valve, a control circuit and a pressure reduction circuit. The oil outlet of the unloading valve is connected with the oil port of the accumulator, and the unloading valve is used to supplement oil to the accumulator. The control circuit comprises a throttle valve and a first two-position four-way electromagnetic valve connected in sequence. The throttle valve is connected with the oil port of the accumulator, and the control port of the first two-position four-way electromagnetic valve is connected with the swash plate type piston pump to control the inclination angle of the swash plate in the swash plate type piston pump. The pressure reduction circuit is provided with a pressure reduction valve. The oil port of the accumulator and the pressure reduction circuit are both provided with pressure sensors.

[0006] Optionally, the system further comprises an overflow valve and a second two-position four-way electromagnetic valve. The overflow valve and the second two-position four-way electromagnetic valve are both connected with the oil port of the accumulator. The overflow valve is used to discharge oil from the swash plate type piston pump hydraulic control system when the pressure of the swash plate type piston pump hydraulic control system becomes large. The second two-position four-way electromagnetic valve is connected with an oil tank, and the second two-position four-way electromagnetic valve is used to return excess hydraulic oil to the oil tank when the accumulator is full.

[0007] Optionally, the nominal diameter of the second two-position four-way solenoid valve is larger than the nominal diameter of the first two-position four-way solenoid valve.

[0008] Optionally, the nominal diameter of the second two-position four-way solenoid valve is 10 mm, and the nominal diameter of the first two-position four-way solenoid valve is 6 mm.

[0009] Optionally, the nominal diameter of the unloading valve and the pressure reducing valve is 25 mm.

[0010] Optionally, the nominal diameter of the overflow valve is 10 mm.

[0011] Optionally, the oil port of the accumulator is connected to multiple control circuits, and the control port of the first two-position four-way solenoid valve of each control circuit is connected to a swash plate piston pump.

[0012] Optionally, the oil port of the accumulator is connected to four control circuits, and the control port of the first two-position four-way solenoid valve of each control circuit is connected to a swash plate piston pump.

[0013] Optionally, the oil return port of any first two-position four-way solenoid valve is connected to an oil tank.

[0014] The present application has the following technical effects compared with the prior art:

[0015] The swash plate piston pump hydraulic control system provided by the present application adopts a cartridge valve structure, which combines an accumulator and an unloading valve together, controls the swash plate change from the outside by introducing oil, and has large or small flow. This system can flexibly control the swash plate of the swash plate piston pump and also provide stable pressure, so as to realize fine adjustment of the swash plate angle, reduce the flow to about 10% of the original flow, save energy consumption, and save cost. The present application has simple structure, flexible design, good controllability, extremely low cost, and convenient maintenance, and is widely used in various industries, and can promote the development of this field and bring considerable economic benefits. At the same time, the nominal diameter of the corresponding cartridge valve combination parts can be adjusted according to the actual situation, the use range is wider, and the adaptability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1The hydraulic schematic diagram of the swashplate piston pump hydraulic control system disclosed in the embodiments of the present invention is shown below.

[0018] The attached figures are labeled as follows:

[0019] 100. Hydraulic control system for swashplate piston pump;

[0020] 1. Unloading valve, 2. Pressure reducing valve, 3. Second two-position four-way solenoid valve, 4. Overflow valve, 5-8. Throttle valve, 9-12. First two-position four-way solenoid valve, 13. Accumulator, 14. Pressure sensor, P is the oil inlet, E1-E4 are the control ports, and E5 is the pressure control port. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] One objective of this invention is to provide a hydraulic control system for a swashplate piston pump, in order to solve the problem that existing swashplate piston pumps generally rely on their own structure for operation, and the swashplate tilt angle is fixed, thus limiting the applicable range of the swashplate piston pump.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] like Figure 1 As shown, this embodiment provides a swashplate piston pump hydraulic control system 100, which mainly consists of a swashplate piston pump, an unloading valve 1, an accumulator 13, a pressure reducing circuit, a pressure sensor 14, and a control circuit. The accumulator 13 stores hydraulic oil to supply oil to the swashplate piston pump hydraulic control system 100. The oil port of the accumulator 13 is connected to an oil circuit main line, which simultaneously connects the unloading valve 1, the pressure reducing circuit, and the control circuit. The oil outlet of the unloading valve 1 is connected to the oil port of the accumulator 13 through this oil circuit main line, and the unloading valve 1 is used to replenish oil into the accumulator 13. The aforementioned control circuit includes a throttle valve and a first two-position four-way solenoid valve connected in sequence. The throttle valve is connected to the oil port of the accumulator 13 through the aforementioned oil circuit main line. Figure 1The throttle valve is connected to the oil circuit between the unloading valve 1 and the oil circuit and the oil port of the accumulator 13; the control ports of the first two-position four-way electromagnetic valve are connected to a swash plate piston pump respectively to control the inclination angle of the swash plate in the swash plate piston pump. The pressure reducing valve 2 is arranged on the pressure reducing circuit, and the oil port of the accumulator and the pressure reducing circuit are both provided with a pressure sensor 14. In this embodiment, one, two, three, four or more control circuits can be arranged, and each control circuit controls one piston pump. Taking the arrangement of four control circuits as an example, the throttle valves of the four control circuits are connected to the oil circuit between the oil port of the accumulator 13 and the connection between the unloading valve 1 and the oil circuit in sequence, and the first two-position four-way electromagnetic valves of the four control circuits are connected to the swash plate piston pump in sequence to control the inclination angle of the swash plate in the swash plate piston pump. Figure 1 As shown, the four control circuits are arranged from left to right in sequence, the throttle valves of the four control circuits are throttle valve 5, throttle valve 6, throttle valve 7 and throttle valve 8 in sequence, and the first two-position four-way electromagnetic valves of the four control circuits are first two-position four-way electromagnetic valve 9, first two-position four-way electromagnetic valve 10, first two-position four-way electromagnetic valve 11 and first two-position four-way electromagnetic valve 12 in sequence. The aforementioned throttle valve 5, throttle valve 6, throttle valve 7 and throttle valve 8 are connected to the oil port of the accumulator 13 through the aforementioned oil circuit, and the control ports of the first two-position four-way electromagnetic valve 9, the first two-position four-way electromagnetic valve 10, the first two-position four-way electromagnetic valve 11 and the first two-position four-way electromagnetic valve 12 are E1 port, E2 port, E3 port and E4 port in the first two-position four-way electromagnetic valve 1, which are control ports for controlling the swash plate of the swash plate piston pump and are connected to a swash plate piston pump respectively to control the opening size of four swash plate piston pumps at the same time. Figure 1 As shown, the four control circuits are arranged from left to right in sequence, the throttle valves of the four control circuits are throttle valve 5, throttle valve 6, throttle valve 7 and throttle valve 8 in sequence, and the first two-position four-way electromagnetic valves of the four control circuits are first two-position four-way electromagnetic valve 9, first two-position four-way electromagnetic valve 10, first two-position four-way electromagnetic valve 11 and first two-position four-way electromagnetic valve 12 in sequence. The aforementioned throttle valve 5, throttle valve 6, throttle valve 7 and throttle valve 8 are connected to the oil port of the accumulator 13 through the aforementioned oil circuit, and the control ports of the first two-position four-way electromagnetic valve 9, the first two-position four-way electromagnetic valve 10, the first two-position four-way electromagnetic valve 11 and the first two-position four-way electromagnetic valve 12 are E1 port, E2 port, E3 port and E4 port in the first two-position four-way electromagnetic valve 1, which are control ports for controlling the swash plate of the swash plate piston pump and are connected to a swash plate piston pump respectively to control the opening size of four swash plate piston pumps at the same time.

[0026] In this embodiment, the overflow valve 4 and the second two-position four-way electromagnetic valve 3 are also arranged in the swash plate piston pump hydraulic control system 100, and the overflow valve 4 and the second two-position four-way electromagnetic valve 3 are connected to the aforementioned oil circuit to be connected to the oil port of the accumulator 13 through the oil circuit, and the overflow valve 4 is used to drain the swash plate piston pump hydraulic control system when the pressure of the swash plate piston pump hydraulic control system increases; the flow of the second two-position four-way electromagnetic valve 3 is larger than that of any of the aforementioned first two-position four-way electromagnetic valves, and the second two-position four-way electromagnetic valve 3 is connected to the oil tank to return the excess hydraulic oil to the oil tank when the accumulator 13 is full of hydraulic oil.

[0027] In this embodiment, the nominal diameter of the second two-position four-way electromagnetic valve 3 is larger than that of any of the first two-position four-way electromagnetic valves. As a preferred solution, the nominal diameter of the aforementioned second two-position four-way electromagnetic valve 3 can be 10 mm, and the nominal diameters of the first two-position four-way electromagnetic valve 9, the first two-position four-way electromagnetic valve 10, the first two-position four-way electromagnetic valve 11 and the first two-position four-way electromagnetic valve 12 are all 6 mm. Correspondingly, the nominal diameters of the unloading valve 1 and the pressure reducing valve 2 are both 25 mm, and the nominal diameter of the overflow valve 4 is 10 mm.

[0028] The working process and working principle of the swashplate piston pump hydraulic control system 100 described in this embodiment will be explained in detail below.

[0029] like Figure 1 As shown, port P is the inlet of the swashplate piston pump hydraulic control system 100, and port E5 is the pressure port of the swashplate piston pump, providing stable pressure for the pump. Under normal operating conditions, oil enters through port P, and the high-pressure oil reaches the unloading valve 1. From the unloading valve 1, oil is quickly replenished to the accumulator 13 via the main oil circuit. The accumulator 13 rapidly stores the hydraulic oil. Once the accumulator 13 has finished storing the hydraulic oil, it transmits it to various control circuits. Taking the first control circuit as an example, the hydraulic oil reaches control port E1 through the throttle valve 5 and the first two-position four-way solenoid valve 9, thereby controlling the swashplate of the piston pump connected to port E1. This allows for precise adjustment of the swashplate angle, thus changing the flow rate of the piston pump. Simultaneously, the accumulator 13 stabilizes the system pressure through the pressure reducing valve 2. Similarly, the opening adjustments for the piston pumps connected to ports E2, E3, and E4 are similar. In actual hydraulic circuits, more control ports can be added. Therefore, the swashplate piston pump hydraulic control system 100 of this technical solution is essentially a swashplate piston pump angle control and pressure stabilization system. It uses an accumulator 13 to supply oil to the system, which is faster and more stable. The relief valve 4 protects the accumulator. When the system pressure increases, oil can be released from the relief valve 4. When the accumulator 13 is full, the high-flow second two-position four-way solenoid valve 3 returns the excess hydraulic oil to the oil tank. The whole system has a simple structure, low cost, and can be widely used.

[0030] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A swash plate type piston pump hydraulic control system comprising a swash plate type piston pump, characterized by, The accumulator is also provided for storing hydraulic oil to supply oil for the system; the oil port of the accumulator is connected with an unloading valve, a control circuit and a pressure reducing circuit; the oil outlet of the unloading valve is connected with the oil port of the accumulator, and the unloading valve is used to supplement oil to the accumulator; the control circuit comprises a throttle valve and a first two-position four-way electromagnetic valve connected in sequence, wherein the throttle valve is connected with the oil port of the accumulator, and the control port of the first two-position four-way electromagnetic valve is connected with the swash plate piston pump to control the inclination angle of the swash plate in the swash plate piston pump; the pressure reducing circuit is provided with a pressure reducing valve; the oil port of the accumulator and the pressure reducing circuit are both provided with pressure sensors; an overflow valve and a second two-position four-way electromagnetic valve are also provided, and the overflow valve and the second two-position four-way electromagnetic valve are both connected with the oil port of the accumulator, the overflow valve is used to discharge oil from the swash plate piston pump hydraulic control system when the pressure of the swash plate piston pump hydraulic control system becomes large; the second two-position four-way electromagnetic valve is connected with an oil tank, and the second two-position four-way electromagnetic valve is used to return excess hydraulic oil to the oil tank when the accumulator is full; the oil port of the accumulator is connected with a plurality of control circuits, and the control port of the first two-position four-way electromagnetic valve of each control circuit is connected with a swash plate piston pump.

2. The swash plate type piston pump hydraulic control system according to claim 1, characterized by, The nominal diameter of the second two-position four-way electromagnetic valve is larger than that of the first two-position four-way electromagnetic valve.

3. The swash plate type piston pump hydraulic control system according to claim 2, characterized by, The nominal diameter of the second two-position four-way electromagnetic valve is 10 mm, and the nominal diameter of the first two-position four-way electromagnetic valve is 6 mm.

4. The swash plate type piston pump hydraulic control system according to claim 3, characterized by, The nominal diameter of the unloading valve and the pressure reducing valve is 25 mm.

5. The swash plate type piston pump hydraulic control system according to claim 4, characterized by, The nominal diameter of the overflow valve is 10 mm.

6. The swash plate type piston pump hydraulic control system according to claim 1, characterized by, The oil port of the accumulator is connected with four control circuits, and the control port of the first two-position four-way electromagnetic valve of each control circuit is connected with a swash plate piston pump.

7. The swash plate type piston pump hydraulic control system according to claim 6, characterized by The oil return port of any first two-position four-way electromagnetic valve is connected with an oil tank.

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