Three-way adjustable pressure compensation speed regulating valve

Abstract

The utility model discloses a three-way adjustable pressure compensation speed regulating valve which comprises a valve sleeve and a threaded sleeve which are in threaded connection, a valve element is arranged in the valve sleeve, an oil inlet, a bypass opening and a priority oil opening are formed in the valve sleeve, an axial hole and a radial hole are formed in the valve element, the front end of the valve element is detachably matched with a throttling plug, and the front end of the throttling plug is provided with an oil inlet, a bypass opening and a priority oil opening. A throttling plug is fixed to the rear end of the valve element, a throttling hole is formed in the center of the throttling plug, a damping screw plug is fixed to the rear end of the valve element, a damping hole is formed in the center of the damping screw plug, and a pressure adjusting assembly mainly comprising a compensation spring is arranged at the rear end of the threaded sleeve. The utility model has the advantages that the structure is simple and reasonable, and the adjustment of supplementary pressure is realized under the condition that the size of the throttling hole is kept unchanged.

Description

Technical Field

[0001] The utility model relates to the technical field of speed regulating valve manufacturing, in particular to a three-way adjustable pressure compensation speed regulating valve. Background Art

[0002] In the throttle valve speed control system, the change of load pressure will directly cause the change of pressure difference before and after the throttle valve. Although the throttle port area remains unchanged, the flow through the throttle valve will change, so the movement speed of the actuator cannot be kept stable. Therefore, the throttle valve can only be used in systems where the load change is small or the flow change has little effect on the working mechanism. In hydraulic systems where the load pressure changes frequently but the load flow is required to be relatively stable, a pressure compensation speed control valve, referred to as a speed control valve, must be used.

[0003] The speed regulating valve is based on the throttle valve, and a set of pressure compensation devices are added to control the pressure difference before and after the throttle port to remain basically unchanged, so as to ensure that the flow rate remains basically unchanged. The speed regulating valve is usually divided into a two-way speed regulating valve and a three-way speed regulating valve. The two-way speed regulating valve is composed of a throttle valve and a differential pressure reducing valve in series, and the three-way speed regulating valve is composed of a throttle valve and a differential relief valve. They can keep the pressure difference of the oil inlet and outlet of the throttle port basically unchanged, so that when the throttle valve is fixed, the flow through the throttle port is independent of the change in load size, and a relatively stable flow rate can be maintained. According to the form of the throttle port, it can be divided into a fixed throttle port speed regulating valve and an adjustable flow port speed regulating valve; however, once the size of the throttle port of the existing speed regulating valve is set, its compensation pressure cannot be adjusted. Therefore, the structure of the existing speed regulating valve needs to be further improved. Utility Model Content

[0004] The purpose of the utility model is to make up for the above-mentioned deficiencies and disclose to the public a three-way adjustable pressure compensation speed regulating valve with a simple and reasonable structure, the size of the throttle port of which is fixed, but the compensation pressure can be adjusted.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A three-way adjustable pressure-compensated speed regulating valve comprises a valve sleeve and a screw sleeve which are threadedly connected to each other, a valve core is arranged in the valve sleeve, an oil inlet, a bypass port and a priority oil port are arranged on the valve sleeve, an axial hole and a radial hole are opened on the valve core, a throttling plug is detachably matched at the front end of the valve core, a throttling hole is arranged at the center of the throttling plug, a damping screw plug is fixed at the rear end of the valve core, a damping hole is arranged at the center of the damping screw plug, and a pressure regulating component which mainly comprises a compensation spring is arranged at the rear end of the screw sleeve.

[0007] The measures to further optimize this technical solution are:

[0008] As an improvement, the pressure regulating assembly includes a pressure regulating screw and a compensation spring, wherein the compensation spring is arranged between the pressure regulating screw and the valve core. By adjusting the position of the pressure regulating screw, the compensation spring is compressed or relaxed, thereby adjusting the compensation pressure.

[0009] As an improvement, the rear end of the threaded sleeve is threadedly connected with a pressure cover, the rear end of the pressure-adjusting screw extends out of the pressure cover, and the outer side of the pressure cover is provided with a locking nut threadedly connected with the pressure-adjusting screw.

[0010] As an improvement, the pressure regulating screw is provided with an assembly cavity, a spring seat is provided in the assembly cavity, and one end of the compensation spring is sleeved outside the spring seat. The provision of the assembly cavity can improve the compactness of the structure; the provision of the spring seat facilitates the installation of the compensation spring.

[0011] As an improvement, a sealing groove is provided on the outer periphery of the pressure regulating screw, and a first sealing ring and a first retaining ring are provided in the sealing groove. The first sealing ring and the first retaining ring constitute a sealing structure, which can improve the sealing performance between the pressure regulating screw and the screw sleeve.

[0012] As an improvement, the radial holes on the valve core include a first radial hole and a second radial hole, the first radial hole is located on the same circumferential surface, the second radial hole is located on the same circumferential surface, the first radial hole and the second radial hole are staggered in the axial direction and the circumferential direction, and the outer periphery of the valve core is provided with a flow groove communicating with the first radial hole and the second radial hole.

[0013] As an improvement, the valve sleeve is provided with assembly grooves between the priority oil port and the bypass port and between the bypass port and the oil inlet, respectively, and a second sealing ring and a second retaining ring are provided in the assembly grooves.

[0014] As an improvement, the outer periphery of the valve core is provided with a plurality of annular grooves, which can eliminate most of the hydraulic clamping force.

[0015] As an improvement, the cross section of the damping screw plug is T-shaped.

[0016] The advantages of the utility model compared with the prior art are:

[0017] The utility model discloses a three-way adjustable pressure compensation speed regulating valve with a simple and reasonable structure. A throttling plug is fixed at the front end of the valve core, a throttling hole is arranged in the center of the throttling plug, a damping screw plug is fixed at the rear end of the valve core, a damping hole is arranged in the center of the damping screw plug, and a pressure regulating component is arranged at the rear end of the screw sleeve. The compression amount of the compensation spring is adjusted by the pressure regulating component, and the adjustment of the supplementary pressure is realized when the size of the throttling hole remains unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of an embodiment of the utility model;

[0019] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of part A in the middle;

[0021] Figure 4 yes Figure 2 Enlarged view of middle part B;

[0022] Figure 5 yes Figure 2 Enlarged view of middle C;

[0023] Figure 6 yes Figure 2 Three-dimensional structural diagram of the middle valve core.

[0024] The names of the reference numerals in the accompanying drawings of the present utility model are:

[0025] Valve sleeve 1, oil inlet 1a, bypass port 1b, priority oil port 1c, assembly groove 1d, screw sleeve 2, valve core 3, axial hole 3a, first radial hole 3b, second radial hole 3c, through flow groove 3d, annular groove 3e, throttle plug 4, throttle hole 4a, damping screw plug 5, damping hole 5a, pressure regulating screw 61, assembly cavity 61a, spring seat 61b, sealing groove 61c, compensation spring 62, pressure cover 63, locking nut 64, first sealing ring 71, first retaining ring 72, second sealing ring 81, second retaining ring 82. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below with reference to the accompanying drawings:

[0027] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be used for other implementation schemes, variations, improvements, equivalent schemes, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0028] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] like Figures 1 to 6 As shown, a three-way adjustable pressure-compensated speed regulating valve comprises a valve sleeve 1 and a screw sleeve 2 which are screwed together, a valve core 3 is arranged in the valve sleeve 1, an oil inlet 1a, a bypass port 1b and a priority oil port 1c are arranged on the valve sleeve 1, an axial hole 3a and a radial hole are opened on the valve core 3, a throttling plug 4 is detachably provided at the front end of the valve core 3, a throttling hole 4a is arranged at the center of the throttling plug 4, a damping screw plug 5 is fixed to the rear end of the valve core 3, a damping hole 5a is arranged at the center of the damping screw plug 5, and a pressure regulating component mainly comprising a compensation spring 62 is arranged at the rear end of the screw sleeve 2.

[0031] The pressure regulating assembly includes a pressure regulating screw 61 and a compensation spring 62 . The compensation spring 62 is arranged between the pressure regulating screw 61 and the valve core 3 .

[0032] A gland 63 is screwed to the rear end of the screw sleeve 2 , and the rear end of the pressure-adjusting screw 61 extends out of the gland 63 . A locking nut 64 screwed to the pressure-adjusting screw 61 is disposed on the outer side of the gland 63 .

[0033] The pressure regulating screw 61 is provided with an assembly cavity 61 a , and the assembly cavity 61 a is provided with a spring seat 61 b ​​. One end of the compensation spring 62 is sleeved outside the spring seat 61 b ​​.

[0034] The outer periphery of the pressure regulating screw 61 is provided with a sealing groove 61c, and the sealing groove 61c is provided with a first sealing ring 71 and a first retaining ring 72. The first sealing ring 71 and the first retaining ring 72 constitute a sealing structure to ensure the sealing between the pressure regulating screw 61 and the screw sleeve 2.

[0035] The radial holes on the valve core 3 include a first radial hole 3b and a second radial hole 3c, the first radial hole 3b is located on the same circumferential surface, the second radial hole 3c is located on the same circumferential surface, the first radial hole 3b and the second radial hole 3c are staggered in the axial direction and the circumferential direction, and the outer circumference of the valve core 3 is provided with a flow groove 3d communicating with the first radial hole 3b and the second radial hole 3c. Such an arrangement increases the flow rate of the radial holes on the valve core 3.

[0036] The valve sleeve 1 is provided with assembly grooves 1d between the priority oil port 1c and the bypass port 1b and between the bypass port 1b and the oil inlet 1a, respectively. A second sealing ring 81 and a second retaining ring 82 are provided in the assembly grooves 1d.

[0037] A plurality of annular grooves 3e are arranged on the outer periphery of the valve core 3. The arrangement of the annular grooves 3e can eliminate most of the hydraulic clamping force.

[0038] The cross section of the damping screw plug 5 is in a T-shaped structure.

[0039] This speed regulating valve is a threaded plug-in three-way structure, that is, it has three working oil ports, the front face is the oil inlet 1a, the side is the bypass port 1b and the priority oil port 1c. The working principle is: the oil inlet 1a is connected to the pressure oil; the bypass port 1b is connected to the bypass oil return port or the load port, and the priority oil port 1c is connected to the priority load port. The three oil ports are all set on the valve sleeve 1, the valve sleeve 1 is threadedly connected to the screw sleeve 2, the valve sleeve 1 and the screw sleeve 2 are provided with a valve core 3 inside, a throttling plug 4 is provided at one end of the valve core 3, and it is fixed with a retaining spring, and a damping screw plug 5 is provided at the other end of the valve core 3.

[0040] A sealing structure (second sealing ring 81 and second retaining ring 82) is provided between the oil inlet 1a and the bypass port 1b of the valve sleeve 1, and a sealing structure (second sealing ring 81 and second retaining ring 82) is also provided between the bypass port 1b and the priority oil port 1c. The rear of the priority oil port 1 is an external thread for connecting with the internal thread of the screw sleeve 2. The interior of the valve sleeve 1 is designed as a stepped through hole, and the step is at the left end. A retaining spring is provided on the outer circle of the left end of the valve core 3, and the retaining spring abuts against the step at the left end of the valve sleeve 1 to achieve axial positioning of the valve core 3. The interior of the valve core 3 is designed as a stepped through hole, with a small diameter in the middle through hole and large stepped holes at both ends. A throttling plug 4 is arranged at the large stepped hole at the right end, and a retaining spring is provided at the end of the large stepped hole for limiting the throttling plug 4. The end of the large stepped hole at the left end is an internal thread, which is connected to the external thread of the damping screw plug 5. A through-flow groove 3d is provided in the middle of the outer circle of the valve core 3, and radial holes are provided on the circumference of the through-flow groove 3d, which communicate with the internal step hole of the valve core 3. The outer circle of the valve core 3 and the inner hole of the valve sleeve 1 are clearance fit, the outer circle of the throttle plug 4 and the step hole at the right end of the valve core 3 are transition fit, and the middle of the throttle plug 4 is a throttle hole 4a; the damping screw plug 5 is provided with a damping hole 5a.

[0041] The initial state of this three-way adjustable pressure compensation speed regulating valve is as follows Figure 2 As shown, under the action of the compensating spring 62 compression force, the valve core 3 is at the far right end, covering the bypass port 1b of the valve sleeve 1. When the pressure oil enters from the oil inlet 1a, it enters the interior of the valve core 3 through the throttling hole 4a of the throttling plug 4, a part of it enters the priority oil port 1c through the radial hole of the valve core 3, and a part of it enters the compensating spring chamber through the damping hole 5a of the damping screw plug 5. The pressure oil acts on the annular area of ​​the outer diameter of the valve core 3 and the diameter of the throttle hole 4a of the throttle plug 4. Compared with the compressive force of the compensation spring 62, after overcoming the spring force, the valve core 3 is pressed to the left, opening the passage of the bypass port 1b of the valve sleeve 1, and at the same time closing the passage of the priority oil port 1c of the valve sleeve 1. When the oil pressure and the compressive force of the compensation spring 62 are balanced, the valve core 3 is stabilized at a certain position. At this time, the pressure difference between the oil inlet 1a and the priority oil port 1c is the compressive force of the compensation spring 62. As long as the axial position of the valve core 3 remains unchanged, this pressure difference will not change, and the flow rate through the middle throttle hole 4a of the throttle plug 4 will not change. When the pressure regulating screw 61 compresses the compensation spring 62, the compressive force of the compensation spring 62 increases, and the valve core 3 will move to the right under the compressive force of the compensation spring 62, which will increase the passage of the priority oil port 1c and reduce the passage of the bypass port 1b. At this time, the flow rate of the priority oil port 1c will increase. In this way, the pressure difference at both ends of the throttle port is increased while the diameter of the throttle hole 4a remains unchanged, thereby achieving the required flow rate regulation.

[0042] The throttle plug 4 and the valve core 3 are detachably matched. By replacing the throttle plug 4 with throttle holes 4a of different apertures, the size of the throttle hole 4a can be adjusted. If the flow rate needs to be increased, it is only necessary to increase the diameter of the throttle hole 4a of the throttle plug 4, which can improve the application range of the speed control valve. The cooperation between the valve core 3 and the valve sleeve 1 of the speed control valve must allow the valve core 3 to move flexibly without sticking, and the relative position can be adjusted at any time with the change of system pressure, so as to maintain the relative stability of the flow of the priority oil port 1c. A plurality of annular grooves 3e are arranged on the circumference of the valve core 3 to eliminate most of the hydraulic clamping force. The damping hole 5a on the damping screw plug 5 can enable the valve core 3 to quickly respond to the sudden change of pressure in the system, thereby quickly opening or quickly closing the bypass port 1b, and finally stabilizing the flow of the priority oil port 1c.

[0043] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A three-way adjustable pressure-compensated speed regulating valve, comprising a valve sleeve (1) and a screw sleeve (2) which are screwed together, a valve core (3) being arranged in the valve sleeve (1), and an oil inlet (1a), a bypass port (1b) and a priority oil port (1c) being arranged on the valve sleeve (1), wherein: The valve core (3) is provided with an axial hole (3a) and a radial hole. The front end of the valve core (3) is detachably equipped with a throttling plug (4). The center of the throttling plug (4) is provided with a throttling hole (4a). The rear end of the valve core (3) is fixed with a damping screw plug (5). The center of the damping screw plug (5) is provided with a damping hole (5a). The rear end of the screw sleeve (2) is provided with a pressure regulating component which mainly includes a compensation spring (62).

2. The three-way adjustable pressure-compensated speed regulating valve according to claim 1 is characterized in that: The pressure regulating assembly comprises a pressure regulating screw (61) and a compensation spring (62), wherein the compensation spring (62) is arranged between the pressure regulating screw (61) and the valve core (3).

3. The three-way adjustable pressure-compensated speed regulating valve according to claim 2 is characterized in that: A pressure cover (63) is screwed to the rear end of the screw sleeve (2), the rear end of the pressure regulating screw (61) extends out of the pressure cover (63), and a locking nut (64) screwed to the pressure regulating screw (61) is arranged on the outer side of the pressure cover (63).

4. The three-way adjustable pressure-compensated speed regulating valve according to claim 3 is characterized in that: The pressure regulating screw (61) is provided with an assembly cavity (61a), the assembly cavity (61a) is provided with a spring seat (61b), and one end of the compensation spring (62) is sleeved outside the spring seat (61b).

5. The three-way adjustable pressure-compensated speed regulating valve according to claim 4 is characterized in that: A sealing groove (61c) is provided on the outer periphery of the pressure regulating screw (61), and a first sealing ring (71) and a first retaining ring (72) are provided in the sealing groove (61c).

6. A three-way adjustable pressure-compensated speed regulating valve according to any one of claims 1 to 5, characterized in that: The radial holes on the valve core (3) include a first radial hole (3b) and a second radial hole (3c); the first radial hole (3b) is located on the same circumferential surface; the second radial hole (3c) is located on the same circumferential surface; the first radial hole (3b) and the second radial hole (3c) are staggered in the axial direction and the circumferential direction; and the outer periphery of the valve core (3) is provided with a flow groove (3d) communicating with the first radial hole (3b) and the second radial hole (3c).

7. The three-way adjustable pressure-compensated speed regulating valve according to claim 6 is characterized in that: The valve sleeve (1) is provided with assembly grooves (1d) between the priority oil port (1c) and the bypass port (1b) and between the bypass port (1b) and the oil inlet port (1a), respectively. A second sealing ring (81) and a second retaining ring (82) are provided in the assembly grooves (1d).

8. The three-way adjustable pressure-compensated speed regulating valve according to claim 7 is characterized in that: The outer periphery of the valve core (3) is provided with a plurality of annular grooves (3e).

9. The three-way adjustable pressure-compensated speed regulating valve according to claim 8 is characterized in that: The cross section of the damping screw plug (5) is in a T-shaped structure.

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