Integrated control valve

Abstract

The utility model discloses an integrated control valve. The problems that an existing pump is single in control and low in control precision are solved. The hydraulic control valve comprises a valve body, an oil inlet, an oil return port, a control oil port and a feedback oil port, and further comprises a constant pressure valve used for constant pressure control of the pump; the load-sensitive valve is used for load-sensitive control; the proportional control valve is used for proportional control; the oil inlet is connected with the reversing control valve, and an oil outlet of the reversing control valve is connected with the load sensitive valve and the proportional control valve; the reversing control valve is provided with a first position enabling the oil inlet to be connected with the control oil port through the proportional control valve and a second position enabling the oil inlet to be connected with the control oil port through the load sensitive valve. The hydraulic control valve has the advantages that the reversing control valve is arranged, the flow direction of pressure oil of the oil inlet can be achieved through reversing, and therefore the hydraulic control valve can adapt to different systems and is simple in structure and wide in application range.

Description

TECHNICAL FIELD

[0001] The utility model relates to a control system of pump, concretely relates to an integrated control valve. BACKGROUND

[0002] Pump usually has variable displacement function, taking plunger pump as an example, plunger pump is an important device of hydraulic system, and plunger pump is generally divided into axial plunger pump and radial plunger pump. It relies on the reciprocating motion of plunger in cylinder to make the volume of sealed working cavity change to realize oil absorption and oil pressing. Plunger pump is widely used in high pressure, large flow and flow adjustment occasions, such as hydraulic machine, engineering machinery and ship.

[0003] When plunger pump works, plunger is forced to reciprocate up and down under the driving of main shaft (of course, plunger can also be driven to reciprocate up and down by other swing members or rotating members), so that cylinder absorbs oil and discharges oil through oil distribution disc, and completes oil pumping task. However, the existing plunger pump has simple structure and single control mode, and there are actual problems of high energy consumption when idle and low precision when used in complex hydraulic system. For example, the pump has a separate load sensing system and an electric proportional control system. The existing method is usually to set the corresponding pump to adapt to the corresponding system, that is, the pump needs to adapt to the system, so that the production cost is high, and the pump adaptation range is small. Moreover, the existing pump usually does not have constant power function and cannot meet the complex vehicle-mounted use environment. SUMMARY

[0004] To solve the problems of single control and low control precision of the existing pump in the background art, the utility model provides an integrated control valve.

[0005] The technical scheme of the utility model is as follows: an integrated control valve, comprising a valve body, an oil inlet, an oil return port, a control oil port and a feedback oil port, further comprising:

[0006] A constant pressure valve is used for constant pressure control of the pump, and the pressure oil of the oil inlet enters the constant pressure valve control cavity and cooperates with the elastic force in the constant pressure valve spring cavity to control the opening size of the constant pressure valve.

[0007] A load sensing valve, the pressure oil of the oil inlet enters the load sensing valve control cavity, and the pressure oil of the feedback oil port enters the load sensing valve spring cavity and cooperates with the elastic force in the load sensing valve spring cavity to control the opening size of the load sensing valve.

[0008] A proportional control valve has a first position for connecting the oil inlet and the control oil port and a second position for connecting the control oil port and the oil return port.

[0009] A reversing control valve, the oil inlet is connected with the reversing control valve, the oil outlet of the reversing control valve is connected with the load sensitive valve and the proportional control valve, the reversing control valve has a first position for connecting the oil inlet with the control oil port through the proportional control valve and a second position for connecting the oil inlet with the control oil port through the load sensitive valve.

[0010] As a further improvement of the utility model, it further comprises a constant power valve, the constant power valve comprises a power valve core and a feedback variable part, the power valve core has a first position during installation and a second position for connecting the oil inlet with the control oil port through the constant power valve; the feedback variable part is connected with the power valve core and is used for adjusting the displacement.

[0011] As a further improvement of the utility model, the constant power valve comprises a power elastic part, the feedback variable part is arranged between the power elastic part and the power valve core, and the power elastic part has a movement trend for driving the power valve core to tend to the first position.

[0012] As a further improvement of the utility model, it further comprises:

[0013] A top block, one end of the top block abuts against the feedback variable part, and the other end of the top block abuts against the power valve core;

[0014] An adjusting screw rod is arranged on the constant power valve and is used for adjusting the thrust force of the top block by abutting against the top block through the power elastic part.

[0015] As a further improvement of the utility model, the feedback variable part is arranged in an L shape, and the feedback variable part is hingedly arranged and can swing relative to the valve body.

[0016] As a further improvement of the utility model, the proportional control valve, the load sensitive valve and the constant pressure valve are sequentially connected, and the oil inlet is connected with the control oil port through the proportional control valve, the load sensitive valve and the constant pressure valve.

[0017] As a further improvement of the utility model, a feedback elastic part is arranged in the spring cavity of the proportional control valve, and the feedback elastic part is connected with a feedback valve sleeve for controlling the displacement of the pump.

[0018] As a further improvement of the utility model, the proportional control valve is an electric proportional control valve.

[0019] As a further improvement of the utility model, the reversing control valve is an electromagnetic reversing valve.

[0020] As a further improvement of the utility model, the reversing control valve is a two-position three-way reversing valve.

[0021] The utility model discloses a beneficial effect is, set the reversing control valve, can realize the flow of pressure oil of oil inlet through reversing, thereby make the product can adapt to different system, product structure simple adaptation range is wide. BRIEF DESCRIPTION OF DRAWINGS

[0022] BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is hydraulic principle schematic diagram of the utility model embodiment.

[0023] BRIEF DESCRIPTION OF DRAWINGS Figure 2 It is proportional control place structure schematic diagram of the utility model embodiment.

[0024] BRIEF DESCRIPTION OF DRAWINGS Figure 3 It is structure schematic diagram when the utility model embodiment is used with pump.

[0025] BRIEF DESCRIPTION OF DRAWINGS Figure 4 It is sectional structure schematic diagram of the utility model embodiment. Figure 3

[0026] In the drawing, 1, valve body;2, constant pressure valve;3, load sensitive valve;4, proportional control valve;41, feedback elastic piece;42, feedback valve sleeve;5, reversing control valve;6, constant power valve;61, power valve core;62, feedback variable piece;63, power elastic piece;64, top block;65, adjusting screw;P, oil inlet;T, oil return port;A, control oil port;X, feedback oil port. DETAILED DESCRIPTION

[0027] The utility model embodiment is further explained in combination with the drawings:

[0028] By Figure 1 In combination Figures 2-4 As shown in a kind of integrated control valve, including valve body 1, oil inlet P, oil return port T, control oil port A and feedback oil port X, further include:

[0029] Constant pressure valve 2, for the constant pressure control of pump, the pressure oil of oil inlet P enters the elastic force in constant pressure valve 2 spring cavity and constant pressure valve 2 control cavity with each other and cooperates to control the opening size of constant pressure valve 2;Constant pressure valve is set adjustable spring on the left side of valve core, initial state, the force generated by right side control oil is less than the adjusting spring force, valve core (constant pressure valve valve core) is in left position, can return oil, when the force generated by right side control oil is greater than the spring force set, valve core switches position, oil inlet and control oil port are connected.

[0030] ​The pressure oil of the oil inlet P enters the control cavity of the load sensing valve 3, the pressure oil of the feedback oil port X enters the spring cavity of the load sensing valve 3 and cooperates with the elastic force of the spring cavity of the load sensing valve 3 to control the opening size of the load sensing valve 3; the load sensing valve is provided with an adjustable spring on the left side of the valve core (the valve core of the load sensing valve) and the feedback oil port X; when the force generated by the control oil on the right side is less than the combined force of the set spring force and the hydraulic oil force generated by the feedback oil port X, the control oil port and the return oil port are connected; when the force generated by the control oil on the right side is greater than the combined force of the set spring force and the hydraulic oil force generated by the feedback oil port X, the valve core switches positions and the oil inlet port and the control oil port are communicated.

[0031] The proportional control valve 4 has a first position in which the oil inlet port P is connected with the control oil port A and a second position in which the control oil port A is connected with the return oil port T; the proportional solenoid is arranged on the left side of the valve core (the valve core of the proportional control valve) of the electric proportional valve, and the right side of the valve core is provided with an adjusting spring, an electric proportional interval control spring and a feedback valve sleeve; in the initial state, the swash plate position of the plunger pump compresses the electric proportional interval control spring, the valve core is in the right position, the oil inlet port and the control oil port are communicated, and the control oil port and the return oil port are communicated when the solenoid is powered.

[0032] The reversing control valve 5 is connected with the oil inlet port P, the oil outlet of the reversing control valve 5 is connected with the load sensing valve 3 and the proportional control valve 4, and the reversing control valve 5 has a first position in which the oil inlet port P is connected with the control oil port A through the proportional control valve 4 and a second position in which the oil inlet port P is connected with the control oil port A through the load sensing valve 3. The reversing control valve 5 is an electromagnetic reversing valve. Specifically, the reversing control valve 5 is a two-position three-way reversing valve. The utility model has the advantages that the reversing control valve is arranged, the flow direction of the pressure oil of the oil inlet port can be realized through reversing, so that the product can be adapted to different systems, the product structure is simple, the adaptation range is wide, the utility model also has the advantages of simple structure, reliable action, high control precision, long service life and the like. The proportional control valve can realize stepless adjustment of the displacement of the plunger pump, the load sensing valve is arranged, the plunger pump displacement is adjusted automatically according to different use conditions, energy consumption is reduced, the constant pressure valve is arranged to limit the maximum output pressure of the pump, so that the product is safe, the product can be adapted to different use conditions and has a wide adaptation range. In the utility model, when the reversing control valve is not powered, the integrated control valve has the functions of electric proportional control, constant power and constant pressure; when the reversing control valve is powered and the electric proportional control valve passes the maximum current, the integrated control valve has the functions of load sensing, constant power and constant pressure. The two-position three-way electromagnetic valve of the utility model is provided with a reset spring, and the electromagnetic iron is not powered and powered in the initial state, so that oil circuit switching is realized.

[0033] The utility model discloses still include constant power valve 6, constant power valve 6 include power valve core 61 and feedback variable part 62, power valve core 61 have the first position of installation time and make the oil inlet P pass through constant power valve 6 with control oil port A intercommunication's second position, feedback variable part 62 be connected with power valve core 61 and be used for adjusting displacement, the utility model discloses set up constant power valve, can adjust plunger pump displacement through feedback variable part when plunger pump pressure rises, realize constant power control, and the customer can adjust output power according to different working conditions, and more energy -conserving.

[0034] Constant power valve 6 include power elastic part 63, feedback variable part 62 set up between power elastic part 63 and power valve core 61, power elastic part 63 have the movement tendency of drive power valve core 61 tend to the first position, the setting of power elastic part can control power valve core, after overcoming the elastic force of power elastic part, can make change pump displacement, thereby make product can set up suitable power according to different working conditions, make product realize constant power output, and product more energy -conserving.

[0035] The utility model discloses still include:

[0036] Top block 64, one end with feedback variable part 62 is opposite, and the other end with power valve core is opposite,

[0037] Adjusting screw rod 65, set up on constant power valve 6, through power elastic part 63 with top block 64 opposite for adjusting the thrust of top block 64, can adjust the elastic force of power elastic part through adjusting screw rod, thereby adjusting the thrust of top block, and the setting force value of power elastic part is convenient to adjust, specifically, feedback variable part 62 is L type setting, feedback variable part 62 is hinged and can swing relative to valve body 1, feedback variable part is usually connected with the return piston on plunger pump, and such structure is convenient for return piston to drive feedback variable part to act, and simple structure, convenient and reliable action.

[0038] Proportion control valve 4, load sensing valve 3, constant pressure valve 2 are connected in proper order, and oil inlet P is connected with control oil port A through proportion control valve 4, load sensing valve 3, constant pressure valve 2 respectively, so that the priority of constant pressure valve after reversing is higher than load sensing valve, and the control priority of load sensing control valve is higher than proportion control valve, so that product realizes multistage high-precision control, and the structure is simple, and the control is convenient and reliable.

[0039] The proportional control valve 4 spring cavity is provided with a feedback elastic element 41, and the feedback elastic element 41 is connected with a feedback valve sleeve 42 for controlling the displacement of the pump.

[0040] In the description of the present application, it should be pointed out that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0042] Skilled persons should know: although the present application has been described according to the above specific embodiments, the present application is not limited to this application, any modification using the present application will be included in the scope of protection of the present application.

Claims

1. An integrated control valve comprising a valve body (1), an oil inlet port (P), an oil return port (T), a control oil port (A) and a feedback oil port (X), characterized in that Also comprising: A constant pressure valve (2) for constant pressure control of the pump, the pressure oil of the oil inlet (P) entering the control cavity of the constant pressure valve (2) and the elastic force in the spring cavity of the constant pressure valve (2) cooperating to control the opening size of the constant pressure valve (2); A load sensitive valve (3), the pressure oil of the oil inlet (P) entering the control cavity of the load sensitive valve (3) and the pressure oil of the feedback oil port (X) entering the spring cavity of the load sensitive valve (3) cooperating with the elastic force in the spring cavity of the load sensitive valve (3) to control the opening size of the load sensitive valve (3); A proportional control valve (4) having a first position connecting the oil inlet (P) with the control oil port (A) and a second position connecting the control oil port (A) with the return oil port (T); A reversing control valve (5) having the oil inlet (P) connected thereto, the oil outlet of the reversing control valve (5) connected with the load sensitive valve (3) and the proportional control valve (4), the reversing control valve (5) having a first position connecting the oil inlet (P) with the control oil port (A) through the proportional control valve (4) and a second position connecting the oil inlet (P) with the control oil port (A) through the load sensitive valve (3).

2. An integrated control valve according to claim 1, wherein Also comprising a constant power valve (6) having a power valve core (61) and a feedback variable part (62), the power valve core (61) having a first position when installed and a second position connecting the oil inlet (P) with the control oil port (A) through the constant power valve (6), the feedback variable part (62) connected with the power valve core (61) and used for adjusting the displacement.

3. An integrated control valve according to claim 2, wherein The constant power valve (6) comprises a power elastic part (63), the feedback variable part (62) is arranged between the power elastic part (63) and the power valve core (61), and the power elastic part (63) has a movement trend driving the power valve core (61) to tend to the first position.

4. An integrated control valve according to claim 3, wherein Also comprising: A top block (64) abutting against the feedback variable part (62) at one end and abutting against the power valve core (61) at the other end; An adjusting screw (65) arranged on the constant power valve (6) and abutting against the top block (64) through the power elastic part (63) to adjust the thrust of the top block (64).

5. An integrated control valve according to claim 3, wherein The feedback variable part (62) is arranged in an L shape, and the feedback variable part (62) is arranged in a hinged manner and can swing relative to the valve body (1).

6. An integrated control valve according to claim 1, wherein The proportional control valve (4), the load sensitive valve (3) and the constant pressure valve (2) are connected in sequence, and the oil inlet (P) is connected with the control oil port (A) through the proportional control valve (4), the load sensitive valve (3) and the constant pressure valve (2) respectively.

7. An integrated control valve according to claim 1, wherein A feedback elastic part (41) is arranged in the spring cavity of the proportional control valve (4), and the feedback elastic part (41) is connected with a feedback valve sleeve (42) for controlling the displacement of the pump.

8. An integrated control valve according to claim 1, wherein The proportional control valve (4) is an electric proportional control valve.

9. An integrated control valve according to claim 1, wherein The reversing control valve (5) is an electromagnetic reversing valve.

10. An integrated control valve according to claim 1, wherein The reversing control valve (5) is a two-position three-way reversing valve.

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