Hydraulic pump with displacement capable of being freely combined and controlled

Abstract

The utility model discloses a hydraulic pump with the displacement capable of being controlled in any combination, which relates to the technical field of hydraulic pumps and comprises a displacement switching valve, a pump body and a displacement regulating valve, the displacement regulating valve is connected with the pump body, the displacement switching valve is a manual valve and is connected with the pump body, and the pump body is connected with the displacement switching valve. Switching of the maximum displacement of the pump body is achieved through opening and closing of the displacement switching valve, and the displacement adjusting valve is used for controlling the actual displacement of the pump body. According to the hydraulic pump with the displacement capable of being controlled in the arbitrary combination mode, the maximum displacement can be rapidly adjusted, and rapid response can be achieved under special working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic pump technical field especially relates to a displacement arbitrary combination control's hydraulic pump. BACKGROUND

[0002] As the core power element of hydraulic system, hydraulic pump relies on the drive of engine or motor, first absorbs oil from hydraulic oil tank, then pressurizes oil through internal mechanical action, forms certain pressure oil, and delivers these pressure oil to system execution element through pipeline. Common variable pump changes the angle of swash plate by inputting different control current or pressure and feeding back to servo valve through feedback mechanism, so as to realize the displacement change of hydraulic pump. But with the gradual increase of power element safety and reliability, electromagnetic valve failure is frequent, and response is slow, so the reliability is not high, which leads to the fact that plunger pump variable displacement cannot be realized under extremely adverse conditions, and variable displacement is in the state of jumping due to the influence of electromagnetic valve, which greatly affects the work efficiency and energy efficiency. SUMMARY

[0003] The utility model discloses a displacement arbitrary combination control's hydraulic pump to solve the problem of prior art, can carry out the quick adjustment of maximum displacement, and can realize fast response under special conditions.

[0004] To achieve the above object, the utility model provides the following scheme:

[0005] The utility model provides a displacement arbitrary combination control's hydraulic pump, include: displacement switching valve, pump body and displacement regulating valve, displacement regulating valve is connected with pump body, displacement switching valve is manual valve, displacement switching valve is connected with pump body, realizes the switching of maximum displacement of pump body through the switch of displacement switching valve, and displacement regulating valve is used for controlling the actual displacement of pump body.

[0006] Preferably, the pump body includes a plurality of first discharge ports and a plurality of second discharge ports, the number of the first discharge ports and the second discharge ports is the same; when half of the first discharge ports and half of the second discharge ports are opened and the other half of the first discharge ports and the other half of the second discharge ports are closed, the maximum displacement of the pump body is in a half displacement state; when all of the first discharge ports and all of the second discharge ports are opened, the maximum displacement of the pump body is in a full displacement state.

[0007] Preferably, the oil liquid input port is connected with the displacement switching valve and the pump body respectively, and the oil liquid output port is connected with the displacement switching valve and the pump body respectively; when the displacement switching valve is opened, the maximum displacement of the pump body is in a full displacement state, all the first discharge outlets and all the second discharge outlets are opened, the oil liquid enters the pump body through the oil liquid input port and is discharged to the oil liquid output port through the first discharge outlets and the second discharge outlets; when the displacement switching valve is closed, the maximum displacement of the pump body is in a half displacement state, half of the first discharge outlets and half of the second discharge outlets are opened and the other half of the first discharge outlets and the other half of the second discharge outlets are closed, the oil liquid enters the pump body through the oil liquid input port and is discharged to the oil liquid output port through the first discharge outlets and the second discharge outlets.

[0008] Preferably, a pressure measuring port is arranged between the oil liquid input port and the pump body and between the oil liquid output port and the pump body.

[0009] Preferably, the displacement switching valve is connected with an inlet of pilot control oil, and the pilot control oil can drive the displacement switching valve to be closed.

[0010] Preferably, the displacement switching valve is a two-position four-way manual valve.

[0011] Preferably, a variable control mechanism is further arranged, the variable control mechanism is connected with the displacement adjusting valve, and the variable control mechanism is used for adjusting the angle of the swash plate of the pump body.

[0012] Preferably, the variable control mechanism is a piston structure, pilot control oil enters the piston structure through the displacement adjusting valve, the piston structure drives the angle of the swash plate to change, and the actual displacement of the pump body is adjusted.

[0013] Preferably, the displacement adjusting valve is provided with an adjusting rod, and the actual displacement of the pump body is controlled by adjusting the adjusting rod.

[0014] Preferably, the displacement adjusting valve is an electromagnetic valve.

[0015] The utility model discloses relative to prior art has obtained following technical effect:

[0016] The utility model discloses through control displacement switching valve switches maximum displacement, then through displacement adjusting valve between zero and maximum displacement adjusts the actual displacement of pump body, has promoted the speed of adjusting displacement, has guaranteed the quick response of emergency working condition, the economy of low load working condition. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings described in the following embodiments are only some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 Figure 1 is a schematic diagram of the hydraulic pump with arbitrary combination control of displacement (full displacement) of the present application;

[0019] Figure 2 Figure 2 is a schematic diagram of the hydraulic pump with arbitrary combination control of displacement (half displacement) of the present application;

[0020] Figure 3 Figure 3 is a ratio curve diagram of the angle of the adjusting rod and the actual displacement and the maximum displacement of the present application;

[0021] Figure 4 Figure 4 is a sectional view of the pump body (full displacement) of the present application;

[0022] Figure 5 Figure 5 is a front view of the pump body of the present application;

[0023] Figure 6 Figure 6 is a side view of the pump body of the present application;

[0024] Figure 7 Figure 7 is a sectional view of the pump body (half displacement) of the present application;

[0025] Figure 8 Figure 8 is a schematic diagram of the variable control mechanism and the swash plate of the present application;

[0026] In the figure: 1-displacement switching valve, 2-pump body, 3-displacement adjusting valve, 4-variable control mechanism, 5-throttle plug, 6-adjusting rod, 7-oil tank, 8-first discharge port, 9-second discharge port, 10-swash plate. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] The present application provides a hydraulic pump with arbitrary combination control of displacement, so as to solve the problems in the prior art and enable rapid adjustment of maximum displacement and rapid response under special working conditions.

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent, comprehensible, combined with the drawings and specific embodiments, the utility model will be explained in further detail.

[0030] As shown in the figure, Figures 1 to 8 The embodiment provides a hydraulic pump with arbitrary combination control of displacement, comprising: a displacement switching valve 1, a pump body 2 and a displacement adjusting valve 3, the displacement adjusting valve 3 is connected with the pump body 2, the displacement switching valve 1 is a manual valve, the displacement switching valve 1 is connected with the pump body 2, the maximum displacement of the pump body 2 is switched through the opening and closing of the displacement switching valve 1, and the displacement adjusting valve 3 is used for controlling the actual displacement of the pump body 2, and the range of the actual displacement is zero to the maximum displacement.

[0031] Specifically, in the embodiment, the pump body 2 comprises a plurality of first discharge outlets 8 and a plurality of second discharge outlets 9, and the number of the first discharge outlets 8 is the same as that of the second discharge outlets 9; when half of the first discharge outlets 8 and half of the second discharge outlets 9 are opened and the other half of the first discharge outlets 8 and the other half of the second discharge outlets 9 are closed, the maximum displacement of the pump body 2 is in a half-displacement state; and when all the first discharge outlets 8 and all the second discharge outlets 9 are opened, the maximum displacement of the pump body 2 is in a full-displacement state.

[0032] In the embodiment, an oil input port (low-pressure oil port) is connected with the displacement switching valve 1 and the pump body 2 respectively, an oil output port (high-pressure oil port) is connected with the displacement switching valve 1 and the pump body 2 respectively, and a pressure measuring port (M A and M B ) is arranged between the oil input port and the pump body 2 and between the oil output port and the pump body 2; when the displacement switching valve 1 is opened (i.e. the displacement switching valve 1 is in an upper position and the displacement switching valve 1 does not work), the maximum displacement of the pump body 2 is in a full-displacement state, all the first discharge outlets 8 and all the second discharge outlets 9 are opened, the first discharge outlets 8 are in a high-pressure oil state, the second discharge outlets 9 are in a low-pressure oil state, oil can enter the pump body 2 through the oil input port and be discharged from the first discharge outlets 8 and the second discharge outlets 9 to the oil output port; when the displacement switching valve 1 is closed (i.e. the displacement switching valve 1 is in a lower position and the displacement switching valve 1 works), the maximum displacement of the pump body 2 is in a half-displacement state, half of the first discharge outlets 8 and half of the second discharge outlets 9 are opened and the other half of the first discharge outlets 8 and the other half of the second discharge outlets 9 are closed, the first discharge outlets 8 are in a high-pressure oil state, the second discharge outlets 9 are in a low-pressure oil state, oil can enter the pump body 2 through the oil input port and be discharged from the first discharge outlets 8 and the second discharge outlets 9 to the oil output port.

[0033] In the embodiment, the displacement switching valve 1 is a two-position four-way manual valve, the displacement switching valve 1 is further connected with an inlet of pilot control oil, and the pilot control oil can drive the displacement switching valve 1 to be closed.

[0034] The embodiment also comprises a variable control mechanism 4, which is a piston structure, and is connected with the displacement adjusting valve 3, and a throttle plug 5 is arranged between the variable control mechanism 4 and the displacement adjusting valve 3, and a valve core or a piston is arranged in the variable control mechanism 4, which divides the inner cavity of the variable control mechanism 4 into a first cavity and a second cavity, and the pilot oil enters the first cavity and the second cavity of the variable control mechanism 4 through the displacement adjusting valve 3, and the pilot oil drives the valve core or the piston of the variable control mechanism 4 to move left and right, thereby driving the swash plate 10 to swing left and right through the intermediate pin, and the control pressure oil ports (X1 and X2) are arranged between the displacement adjusting valve 3 and the cavity of the variable control mechanism 4, the variable control mechanism 4 drives the angle change of the swash plate 10, and the actual displacement of the pump body 2 is adjusted. In the embodiment, the variable control mechanism 4 can adopt the variable control mechanism in the prior art.

[0035] In the embodiment, the displacement adjusting valve 3 is an electromagnetic valve, and the displacement adjusting valve 3 is provided with an adjusting rod 6, and the actual displacement of the pump body 2 is controlled by adjusting the adjusting rod 6.

[0036] In the embodiment, the shell oil discharge ports (T1 and T2) are connected with the oil tank 7.

[0037] When the hydraulic pump of the embodiment is working, as shown in FIG. 1, Figure 1 when the maximum displacement needs to be in a full displacement state, 1.5Mpa low-pressure oil enters from the oil input port, is output from the oil output port after passing through the pump body 2, and the displacement switching valve 1 is in an upper position (i.e., an open state) for full displacement output, and specifically, all the first discharge ports 8 and all the second discharge ports 9 are opened, the pilot control oil introduced through the pilot control oil inlet (oil port X) flows through the displacement adjusting valve 3, when the left position is powered, the displacement adjusting valve 3 switches to the left position, the pilot control oil flows into the variable control mechanism 4 through the throttle plug 5, the variable control mechanism 4 drives the angle change of the swash plate 10, and is adjusted to the required displacement of the hydraulic pump in the normal working condition, and the angle of the adjusting rod 6 and the ratio relationship between the actual displacement and the maximum displacement are as shown in FIG. 2, Figure 3 in the full displacement state, the actual displacement of the pump can be changed at will by adjusting the adjusting rod 6, that is, the pump body 2 slowly adjusts the actual displacement of the pump body 2 according to the demand of the working device of the oil input; as shown in FIG. 2, when an emergency or low-load working condition is encountered, the pilot control oil of the pilot control oil inlet (oil port X) is given to the displacement switching valve 1, and the displacement switching valve 1 is in a lower position, that is, the displacement switching valve 1 is closed; specifically, half of the first discharge ports 8 and half of the second discharge ports 9 are opened, and the other half of the first discharge ports 8 and the other half of the second discharge ports 9 are closed, so that the pump body 2 is forcibly reduced to half displacement, and the displacement adjusting valve 3 can be used to steplessly adjust the displacement between zero and half displacement, and the angle of the adjusting rod 6 and the ratio relationship between the actual displacement are as shown in FIG. 3. Figure 3 Figure 3 ​The horizontal coordinate represents the ratio of the current actual displacement to the maximum displacement, and the vertical coordinate is the angle of the adjusting rod 6. It can be seen that when the maximum displacement is switched to half displacement, the curve has a larger slope, which means that the device can respond faster, ensuring the fast and stable response of the device in emergency situations and the economy in low load situations.

[0038] The embodiment realizes the switching of high speed and large torque through various displacement combinations. The full displacement and half displacement are adjusted by changing the number of oil passage openings through the displacement switching valve 1, the switching of the maximum displacement is realized, and the stepless adjustment from zero to the maximum displacement is realized through the displacement adjusting valve 3 and the variable control mechanism 4. On the one hand, the displacement is controlled by various combinations, and on the other hand, when the displacement adjusting valve 3 fails, the maximum displacement can be switched to half displacement through the displacement switching valve 1, the power is reduced, and the energy is saved. The problem of needing to switch to half displacement and quickly lift the object in special working conditions, such as when the hydraulic pump is used for a marine lifting machine (closed system) and is inevitably subjected to high sea conditions (the need for fast lifting and lowering of lifeboats in emergency situations), is solved. The speed of adjusting the maximum displacement is improved, the fast response in emergency working conditions is ensured, the economy in low load working conditions is ensured, the safety of the operator and the safety of the device are protected.

[0039] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used to help understand the method and core idea of the utility model. Meanwhile, according to the idea of the utility model, the specific implementation mode and application range will be changed by the general technical personnel in the field. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A hydraulic pump with arbitrarily controllable displacement, characterized in that: include: The pump body comprises a displacement switching valve, a pump body, and a displacement regulating valve. The displacement regulating valve is connected to the pump body. The displacement switching valve is a manual valve. The displacement switching valve is connected to the pump body. The maximum displacement of the pump body is switched by opening and closing the displacement switching valve. The displacement regulating valve is used to control the actual displacement of the pump body.

2. The hydraulic pump with arbitrarily controllable displacement according to claim 1, characterized in that: The pump body includes a plurality of first outlets and a plurality of second outlets, the number of first outlets and second outlets being the same; when half of the first outlets and half of the second outlets are open and the other half of the first outlets and the other half of the second outlets are closed, the maximum displacement of the pump body is half displacement; when all of the first outlets and all of the second outlets are open, the maximum displacement of the pump body is full displacement.

3. The hydraulic pump with arbitrarily controllable displacement according to claim 2, characterized in that: The oil inlet is connected to both the displacement switching valve and the pump body, and the oil outlet is also connected to both the displacement switching valve and the pump body. When the displacement switching valve is open, the pump body's maximum displacement is at full capacity, with all first outlets and all second outlets open. Oil enters the pump body through the oil inlet and is discharged to the oil outlet through the first and second outlets. When the displacement switching valve is closed, the pump body's maximum displacement is at half capacity, with half of the first and second outlets open and the other half closed. Oil enters the pump body through the oil inlet and is discharged to the oil outlet through the first and second outlets.

4. The hydraulic pump with arbitrarily controllable displacement according to claim 3, characterized in that: Pressure testing ports are provided between the oil inlet and the pump body, and between the oil outlet and the pump body.

5. The hydraulic pump with arbitrarily controllable displacement according to claim 1, characterized in that: The displacement switching valve is connected to the inlet of the pilot control oil, which can drive the displacement switching valve to close.

6. The hydraulic pump with arbitrarily combinable displacement control according to claim 1, characterized in that: The displacement switching valve is a two-position four-way manual valve.

7. The hydraulic pump with arbitrarily controllable displacement according to claim 1, characterized in that: It also includes a variable control mechanism, which is connected to the displacement regulating valve and is used to adjust the angle of the swashplate of the pump body.

8. The hydraulic pump with arbitrarily controllable displacement according to claim 7, characterized in that: The variable control mechanism is a piston structure. Pilot control oil enters the piston structure through the displacement regulating valve. The piston structure drives the angle of the swashplate to change, thereby adjusting the actual displacement of the pump body.

9. The hydraulic pump with arbitrarily controllable displacement according to claim 1, characterized in that: The displacement regulating valve is equipped with an adjusting rod, and the actual displacement of the pump body is controlled by adjusting the adjusting rod.

10. The hydraulic pump with arbitrarily controllable displacement according to claim 1, characterized in that: The displacement regulating valve is a solenoid valve.

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