CN220599947U - Variable plunger pump - Google Patents
Variable plunger pump Download PDFInfo
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- CN220599947U CN220599947U CN202322333665.1U CN202322333665U CN220599947U CN 220599947 U CN220599947 U CN 220599947U CN 202322333665 U CN202322333665 U CN 202322333665U CN 220599947 U CN220599947 U CN 220599947U
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- 239000003921 oil Substances 0.000 claims abstract description 82
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 7
- 230000008859 change Effects 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Abstract
A variable displacement plunger pump. The plunger pump solves the problems of single control and high energy consumption of the existing plunger pump. The hydraulic oil of the working oil port enters a control cavity of the load-sensitive control valve through the load-sensitive control oil circuit, and pressure oil of the control oil inlet enters a spring cavity of the load-sensitive control valve and the elastic force of the spring cavity of the load-sensitive control valve to mutually cooperate to control the opening size of the load-sensitive control valve. According to the utility model, the proportional control valve is arranged to realize stepless adjustment of the displacement of the plunger pump, and the load sensitive control valve is arranged to enable products to automatically adjust the displacement of the plunger pump according to different use conditions, so that the energy consumption is reduced.
Description
Technical Field
The utility model relates to a plunger pump, in particular to a variable plunger pump.
Background
Plunger pumps are an important device of hydraulic systems, and are generally classified into axial plunger pumps and radial plunger pumps. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity, so as to realize oil absorption and pressure oil. Plunger pumps are widely used in applications where high pressure, high flow and flow are to be regulated, such as hydraulic presses, engineering machinery and ships.
When the plunger pump works, the plunger is forced to reciprocate up and down under the drive of the main shaft (of course, the plunger can also be driven to reciprocate up and down by other swinging pieces and rotating pieces), so that the cylinder body can absorb oil and discharge oil through the oil distribution disc, and the oil pumping task is completed. However, the existing plunger pump has the practical problems of simple structure, single control mode, high energy consumption in no-load and low use precision in a complex hydraulic system.
Disclosure of Invention
The utility model provides a variable plunger pump, which aims to solve the problems of single control, high energy consumption and low precision of the existing plunger pump in the background technology.
The technical scheme of the utility model is as follows: the utility model provides a variable plunger pump, includes casing, rotor subassembly and work hydraulic fluid port, the casing in be equipped with control piston and return piston, control piston and return piston all with rotor subassembly mutually support and be used for adjusting the discharge capacity size, the casing on be equipped with the control valve group, the control valve group include proportional control valve, load sensitive control valve and constant pressure valve, be equipped with control oil inlet, output hydraulic fluid port and load sensitive control oil circuit on the control valve group, the output hydraulic fluid port link to each other with control piston and be used for driving control piston motion to change the discharge capacity, the proportional control valve have the first position that makes control oil inlet and output hydraulic fluid port link to each other and the second position that makes output hydraulic fluid port and oil tank link to each other, the hydraulic oil of work hydraulic fluid port gets into load sensitive control valve control chamber, the pressure oil of control oil inlet gets into load sensitive control valve spring chamber and load sensitive control valve spring chamber's elastic force mutually support and control load sensitive control valve spring chamber's opening size, the pressure oil inlet gets into the opening size of constant pressure valve mutually support control constant pressure valve with the elastic force in constant pressure valve spring chamber, proportional control valve link to each other through load sensitive control valve, the constant pressure valve and the constant pressure valve.
As a further improvement of the utility model, the proportional control valve, the load sensitive control valve and the constant pressure valve are connected in sequence, and the control oil inlet is connected with the output oil port through the proportional control valve, the load sensitive control valve and the constant pressure valve respectively.
As a further improvement of the utility model, an adjustable elastic piece is arranged in the proportional control valve spring cavity.
As a further improvement of the utility model, a feedback elastic piece is arranged in the proportional control valve spring cavity, the feedback elastic piece is connected with a return piston through a connecting rod, and the return piston drives the connecting rod to move so as to adjust the elastic force of the feedback elastic piece.
As a further improvement of the utility model, the proportional control valve is an electric proportional control valve.
As a further improvement of the utility model, the load-sensitive control valve is a two-position three-way reversing valve.
As a further improvement of the utility model, an external oil port is arranged on the shell, a shuttle valve is arranged in the shell, and the shuttle valve selects the external oil port or the pressure oil of the working oil port to be input into the control oil inlet.
As a further improvement of the utility model, the working oil port is connected with the return piston through a first throttle valve, and the output oil port is connected with the control piston through a second throttle valve.
As a further improvement of the utility model, the working oil port is connected with the load-sensitive control oil path through an adjustable throttle valve.
The utility model has the advantages that the displacement of the plunger pump can be steplessly regulated by arranging the proportional control valve, the displacement of the plunger pump can be automatically regulated by arranging the load sensitive control valve according to different working conditions, the energy consumption is reduced, the highest output pressure of the pump is limited by arranging the constant pressure valve, the safety of the product is high, the product can be used under different working conditions, and the adaptation range is wide. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present utility model.
Fig. 2 is a schematic diagram of the hydraulic principle of an embodiment of the present utility model.
Fig. 3 is a schematic structural diagram of an embodiment of the present utility model.
Fig. 4 is a schematic diagram of the hydraulic principle at the control valve group according to the embodiment of the present utility model.
FIG. 5 is a schematic diagram of a load-sensitive control valve according to an embodiment of the present utility model.
Fig. 6 is a schematic structural diagram of a constant pressure valve according to an embodiment of the present utility model.
In the figure, 1, a shell; 2. a rotor assembly; 3. a control piston; 4. a return piston; 5. a control valve group; 6. a proportional control valve; 61. an adjustable elastic member; 62. a feedback elastic member; 63. a connecting rod; 7. a load sensitive control valve; 8. a constant pressure valve; 9. a shuttle valve; 10. a first throttle valve; 11. a second throttle valve; 12. an adjustable throttle valve; 13. a working oil port; A. controlling an oil inlet; p, an oil outlet; x, a load sensitive control oil way; t, an oil tank; G. and an oil port is externally connected.
Detailed Description
Embodiments of the utility model are further described below with reference to the accompanying drawings:
the variable plunger pump is shown by combining fig. 1 with fig. 2-6, and comprises a shell 1, a main shaft, a rotor assembly 2 and a working oil port 13, wherein the rotor assembly comprises a plunger, a cylinder body and a rotary table, a control piston 3 and a return piston 4 are arranged in the shell 1, the control piston 3 and the return piston 4 are mutually matched with the rotor assembly 2 and used for adjusting the displacement, a control valve group 5 is arranged on the shell 1, the control valve group 5 comprises a proportional control valve 6, a load sensitive control valve 7 and a constant pressure valve 8, a control oil inlet A, an output oil port P and a load sensitive control oil way X are arranged on the control valve group 5, the output oil port P is connected with the control piston 3 and used for driving the control piston 3 to move to change the displacement, the proportional control valve 6 is provided with a first position for enabling the control oil inlet A to be connected with the output oil port P and a second position for enabling the output oil port P to be connected with an oil tank T, hydraulic oil of the working oil port 13 enters a control cavity of the load sensitive control valve 7 through the load sensitive control oil way X, hydraulic oil of the working oil port A enters a spring cavity of the load sensitive control valve 7, the pressure oil inlet A enters the spring cavity of the load sensitive control valve 7, the constant pressure valve 7 and a constant pressure valve 8, the pressure valve is connected with the constant pressure valve 8 through the elastic valve 6 and the constant pressure valve 6 is matched with the load sensitive valve 7, and the constant pressure valve 8. The utility model has the advantages that the displacement of the plunger pump can be steplessly regulated by arranging the proportional control valve, the regulation is convenient and reliable, the precision is high, the displacement of the plunger pump can be automatically regulated by arranging the load sensitive control valve according to different use working conditions, the energy consumption is reduced, the highest output pressure of the pump is limited by arranging the constant pressure valve, the safety of the product is high, the product can be used under different working conditions, and the adaptation range is wide. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life and the like. Specifically, the working principle is as follows: the pressure oil at the port A is the same as the pressure oil at the port P in the initial state, and when the electromagnet is powered on, the proportional control valve in the control valve group enables the port P and the port T to be subjected to proportional unloading, so that the product can realize stepless regulation, and the control valve is primary control of the utility model; the hydraulic control system is characterized in that a load-sensitive control oil way X is arranged, the pressure on one side of a spring of the load-sensitive control valve is changed and regulated through an external throttle valve (an adjustable throttle valve), so that pressure difference is formed on two sides of a valve core of the load-sensitive control valve, when the resultant hydraulic force born by the valve core of the load-sensitive control valve is larger than a set force value of the spring, an A port is communicated with a P port, load-sensitive control is realized, the displacement is controlled, and the precision control of the displacement is realized; the right side of the constant pressure valve is pushed by the force generated by the hydraulic oil at the opening A, when the pressure of the hydraulic oil at the opening A is larger than the set force value of the spring of the constant pressure valve, the opening A is communicated with the opening P, and the opening A is directly connected with the opening P through the constant pressure valve, so that the product safety is higher, and the three-level control is realized; the high-level control valve can be overridden by the low-level control valve to enable the plunger pump to change the displacement so as to meet the use requirements of different working conditions, and the product has the characteristics of various control modes, high control precision and low energy consumption.
The proportional control valve 6, the load sensitive control valve 7 and the constant pressure valve 8 are sequentially connected, and the control oil inlet A is connected with the output oil port P through the proportional control valve 6, the load sensitive control valve 7 and the constant pressure valve 8 respectively. Therefore, the reversing priority of the constant pressure valve is higher than that of the load sensitive control valve, and the control priority of the load sensitive control valve is higher than that of the proportional control valve, so that the product realizes multi-stage high-precision control, and the control device is simple in structure and convenient and reliable. Specifically, the load-sensitive control valve 7 is a two-position three-way reversing valve.
An adjustable elastic piece 61 is arranged in the spring cavity of the proportional control valve 6. The structure can adjust the opening pressure and proportion of the proportional control valve, and is simple in structure and convenient and reliable in adjustment.
The proportional control valve 6 is provided with a feedback elastic piece 62 in a spring cavity, the feedback elastic piece 62 is connected with the return piston 4 through a connecting rod 63, and the return piston 4 drives the connecting rod 63 to move so as to adjust the elastic force of the feedback elastic piece 62. The elastic force of the feedback elastic piece can be adjusted through the movement of the return spring, so that the opening size of the proportional control valve is adjusted. More specifically, the proportional control valve 6 is an electric proportional control valve.
The casing 1 on be equipped with external hydraulic fluid port G, casing 1 in be equipped with shuttle valve 9, shuttle valve 9 select external hydraulic fluid port G or the pressure oil of work hydraulic fluid port 13 to input control oil inlet A. The setting of external hydraulic fluid port also can control the pump discharge capacity through the control disk seat in actual production process, and external equipment of being convenient for uses, and control is convenient and reliable.
The working oil port 13 is connected with the return piston 4 through the first throttle valve 10, and the output oil port P is connected with the control piston 3 through the second throttle valve 11. Specifically, the working oil port 13 is connected to the load-sensitive control oil passage X through an adjustable throttle valve 12. The structure reduces the impact of products, and has simple structure and high safety.
In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. Furthermore, in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
The skilled person will know: while the utility model has been described in terms of the foregoing embodiments, the inventive concepts are not limited to the utility model, and any modifications that use the inventive concepts are intended to be within the scope of the appended claims.
Claims (9)
1. A variable plunger pump comprises a shell (1), a rotor assembly (2) and a working oil port (13), wherein a control piston (3) and a return piston (4) are arranged in the shell (1), the variable plunger pump is characterized in that the control piston (3) and the return piston (4) are matched with the rotor assembly (2) to be used for adjusting the displacement, the shell (1) is provided with a control valve group (5), the control valve group (5) comprises a proportional control valve (6), a load sensitive control valve (7) and a constant pressure valve (8), the control valve group (5) is provided with a control oil inlet (A), an output oil port (P) and a load sensitive control oil way (X), the output oil port (P) is connected with the control piston (3) to be used for driving the control piston (3) to move to change the displacement, the proportional control valve (6) is provided with a first position for enabling the control oil inlet (A) to be connected with the output oil port (P) and a second position for enabling the output oil port (P) to be connected with an oil tank (T), and hydraulic oil of the working oil port (13) enters the load sensitive control valve (7) through the load sensitive control oil way (X) and the load sensitive control valve (7), the pressure oil of the control oil inlet (A) enters a spring cavity of a load sensitive control valve (7) and the elastic force of the spring cavity of the load sensitive control valve (7) to mutually cooperate to control the opening size of the load sensitive control valve (7), the pressure oil of the control oil inlet (A) enters a control cavity of a constant pressure valve (8) and the elastic force in the spring cavity of the constant pressure valve (8) to mutually cooperate to control the opening size of the constant pressure valve, and the proportional control valve (6) is connected with an output oil port (P) through the load sensitive control valve (7) and the constant pressure valve (8).
2. The variable plunger pump according to claim 1, wherein the proportional control valve (6), the load sensitive control valve (7) and the constant pressure valve (8) are sequentially connected, and the control oil inlet (a) is connected with the output oil port (P) through the proportional control valve (6), the load sensitive control valve (7) and the constant pressure valve (8) respectively.
3. A variable displacement pump according to claim 1, characterized in that the proportional control valve (6) is provided with an adjustable elastic member (61) in the spring chamber.
4. The variable displacement plunger pump according to claim 1, wherein a feedback elastic member (62) is arranged in the spring cavity of the proportional control valve (6), the feedback elastic member (62) is connected with the return piston (4) through a connecting rod (63), and the return piston (4) drives the connecting rod (63) to move so as to adjust the elastic force of the feedback elastic member (62).
5. A variable displacement pump according to claim 1, characterized in that the proportional control valve (6) is an electric proportional control valve.
6. A variable displacement pump according to claim 1, characterized in that the load-sensitive control valve (7) is a two-position three-way reversing valve.
7. The variable displacement plunger pump of claim 1, wherein the casing (1) is provided with an external oil port (G), the casing (1) is internally provided with a shuttle valve (9), and the shuttle valve (9) selects the external oil port (G) or the pressure oil of the working oil port (13) to be input into the control oil inlet (a).
8. A variable displacement pump according to claim 1, characterized in that the working port (13) is connected to the return piston (4) via a first throttle valve (10), and the outlet port (P) is connected to the control piston (3) via a second throttle valve (11).
9. A variable displacement pump according to claim 1, characterized in that the working port (13) is connected to the load-sensitive control oil circuit (X) via an adjustable throttle valve (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322333665.1U CN220599947U (en) | 2023-08-30 | 2023-08-30 | Variable plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322333665.1U CN220599947U (en) | 2023-08-30 | 2023-08-30 | Variable plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220599947U true CN220599947U (en) | 2024-03-15 |
Family
ID=90169132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322333665.1U Active CN220599947U (en) | 2023-08-30 | 2023-08-30 | Variable plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220599947U (en) |
-
2023
- 2023-08-30 CN CN202322333665.1U patent/CN220599947U/en active Active
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