Adjustable overflow valve

Abstract

The utility model discloses an adjustable overflow valve, which belongs to the technical field of overflow valves, and comprises an overflow valve main body and a screw rod which is inserted at one end of the overflow valve main body in a threaded manner, a connecting nozzle is fixedly embedded in the other end of the overflow valve main body, a spring is embedded in the overflow valve main body, and the connecting nozzle is fixedly connected with the overflow valve main body. A sliding plate is installed at one end of the overflow valve body, a lifting plate used for sealing the connecting nozzle is installed at the other end of the overflow valve body, a pressure relief hole located between the lifting plate and the sealing nozzle is formed in the side wall of the overflow valve body, and positioning grooves are formed in the ends, close to the sliding plate, of the screws. A transmission ball is rotationally clamped between the two positioning grooves and embedded in a screw, and a knob is fixedly connected to the end, extending out of the overflow valve body, of the screw. The adjustable overflow valve avoids the situation that a spring rotates due to the influence of rotating force, and the accuracy of pressure adjustment of the overflow valve is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of overflow valves, and in particular relates to an adjustable overflow valve. Background Art

[0002] Hydraulics is a term used in the machinery industry and the electromechanical industry. Hydraulics can be used as a power transmission method, which is called hydraulic transmission. Hydraulics can also be used as a control method, which is called hydraulic control. Hydraulic transmission uses liquid as the working medium and uses the pressure energy of the liquid to transmit power. The overflow valve is an indispensable part of the hydraulic machinery industry. It mainly plays a safety protection role in hydraulic equipment, such as constant pressure overflow, voltage stabilization, and system unloading. In the hydraulic system of engineering machinery, the overflow valve is crucial for system pressure limiting and safety protection. At present, engineering machinery equipment is set to a fixed pressure when leaving the factory, which can meet the use requirements of general working conditions.

[0003] Patent application number 202121055854.1 discloses an adjustable relief valve. An adjustable relief valve comprises: a valve body, on which an oil inlet and an oil outlet are formed; a valve core, which is slidably mounted in the valve body; a pressure regulating member, which is positionally adjustable and mounted on the valve body, a control chamber is formed between the pressure regulating member and the valve core, an elastic member is mounted in the control chamber, and the two ends of the elastic member act on the pressure regulating member and the valve core respectively, and a control oil port is also formed on the pressure regulating member, and the control oil port is connected to the control chamber.

[0004] The above technical solution utilizes a pressure regulating member threadedly connected to the valve body to achieve the regulation of the overflow valve pressure. However, since the two ends of the spring embedded in the valve body are respectively abutted against the valve core and the pressure regulating member, the pressure regulating member is likely to drive the spring to rotate synchronously during rotation, and the stress generated by the rotation of the spring after adjustment is likely to drive the pressure regulating member to rotate and reset, resulting in poor accuracy in the pressure regulation of the overflow valve. Utility Model Content

[0005] (1) Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an adjustable relief valve, which aims to solve the technical problem that the pressure regulation accuracy of the relief valve is poor due to the fact that the two ends of the spring embedded in the valve body are respectively abutted against the valve core and the pressure regulating part. Therefore, when the pressure regulating part rotates, it is easy to drive the spring to rotate synchronously, and the stress generated by the rotation of the spring after adjustment is easy to drive the pressure regulating part to rotate and reset.

[0007] (2) Technical solution

[0008] In order to solve the above technical problems, the utility model provides an adjustable overflow valve, which includes an overflow valve body and a screw threadedly inserted at one end of the overflow valve body, a connecting nozzle is embedded and fixed at the other end of the overflow valve body, a spring is embedded in the overflow valve body, and a slide is installed at one end of the overflow valve body, and a lifting plate for sealing the connecting nozzle is installed at the other end of the overflow valve body, wherein a pressure relief hole located between the lifting plate and the sealing nozzle is provided on the side wall of the overflow valve body, a positioning groove is provided at one end of the screw close to the slide, and a transmission ball is rotatably clamped between the two positioning grooves.

[0009] When the adjustable relief valve of the technical solution is used, a spring is embedded in the relief valve body, and a slide plate and a lifting plate abutting against the spring are installed in the relief valve body. When the pressure of the relief valve is adjusted, the screw is driven to rotate by the knob, and the transmission ball squeezes the slide plate to move during the rotation, and squeezes the spring to adjust its elastic pressure during the movement. Since the screw drives the transmission ball to rotate synchronously during the rotation, the situation that the spring rotates due to the influence of the rotational force is avoided, and the accuracy of the pressure adjustment of the relief valve is improved; a connecting nozzle is installed at the bottom end of the relief valve body, and a sealing ball is installed between the sealing hole at the top of the connecting nozzle and the convex part at the bottom end of the lifting plate. When the pressure of the connecting cavity at the bottom of the connecting nozzle is greater than the extrusion force of the spring, the sealing ball and the lifting plate are pushed to move upward, and the pressure is discharged through the sealing hole and the pressure relief hole. Due to the narrow gap between the sealing ball and the sealing hole, the pressure is discharged, and the accuracy of the pressure discharge is improved. At the same time, when the pressure is too large, the first limit rod and the second limit rod squeeze each other, avoiding the situation that the spring is squeezed and deformed excessively and damaged.

[0010] Preferably, the transmission ball is embedded in the screw, and one end of the screw extending out of the overflow valve body is fixedly connected to a knob.

[0011] Furthermore, an installation groove is provided on the outer wall of the slide plate, and a sealing ring tightly connected to the inner wall of the overflow valve body is embedded in the installation groove.

[0012] Furthermore, a connecting cavity is provided at the bottom of the connecting nozzle, and a sealing hole communicating with the connecting cavity is provided at the top of the connecting nozzle.

[0013] Furthermore, a protrusion is fixed to the bottom end of the lifting plate, and a groove is formed at the bottom end of the protrusion.

[0014] Furthermore, a sealing ball is embedded in the groove, and the bottom end of the sealing ball is tightly connected to the inner wall of the sealing hole.

[0015] Furthermore, a first limiting rod and a second limiting rod are respectively fixed to one end of the lifting plate close to the slide plate, and the first limiting rod and the second limiting rod are both embedded in the spring.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model has a spring embedded in the relief valve body, and a slide plate and a lifting plate abutting against the spring are installed in the relief valve body. When the pressure of the relief valve is adjusted, the screw is driven to rotate by the knob, and the transmission ball squeezes the slide plate to move during the rotation, and squeezes the spring to adjust its elastic pressure during the movement. Since the screw drives the transmission ball to rotate synchronously during the rotation, the situation that the spring rotates due to the influence of the rotational force is avoided, and the accuracy of the pressure adjustment of the relief valve is improved.

[0019] A connecting nozzle is installed at the bottom end of the relief valve body, and a sealing ball is installed between the sealing hole at the top of the connecting nozzle and the raised part at the bottom end of the lifting plate. When the pressure in the connecting cavity at the bottom of the connecting nozzle is greater than the extrusion force of the spring, the sealing ball and the lifting plate are pushed upward, and the pressure is discharged through the sealing hole and the pressure relief hole. Due to the narrow gap between the sealing ball and the sealing hole, the pressure can be discharged more easily, thereby improving the accuracy of pressure discharge. At the same time, when the pressure is too large, the first limit rod and the second limit rod are squeezed against each other, thereby avoiding the situation where the spring is squeezed and deformed excessively and caused damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 This is a schematic cross-sectional structure diagram of the overflow valve body of the utility model;

[0023] Figure 3 For the utility model Figure 2 A schematic diagram of the structure enlargement in the middle;

[0024] Figure 4 For the utility model Figure 2 Enlarged schematic diagram of the structure at point B in the middle.

[0025] The markings in the attached drawings are: 1. overflow valve body; 2. connecting nozzle; 3. knob; 4. spring; 5. screw; 6. pressure relief hole; 7. lifting plate; 8. groove; 9. first limiting rod; 10. raised part; 11. sealing ball; 12. connecting cavity; 13. sealing hole; 14. second limiting rod; 15. slide plate; 16. transmission ball; 17. positioning groove; 18. mounting groove; 19. sealing ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] This specific implementation is an adjustable relief valve, and its structural schematic diagram is as follows Figure 1 and Figure 2 As shown, the adjustable relief valve includes a relief valve body 1 and a screw rod 5 threadedly inserted at one end of the relief valve body 1, a connecting nozzle 2 is embedded and fixed at the other end of the relief valve body 1, a spring 4 is embedded in the relief valve body 1, and a slide plate 15 is installed at one end of the relief valve body 1, and a lifting plate 7 for sealing the connecting nozzle 2 is installed at the other end of the relief valve body 1, wherein the side wall of the relief valve body 1 is provided with a pressure relief hole 6 located between the lifting plate 7 and the sealing nozzle, and a positioning groove 17 is opened at one end of the screw rod 5 close to the slide plate 15, and a transmission ball 16 is rotatably clamped between the two positioning grooves 17, the knob 3 drives the screw rod 5 to rotate, and in the process of rotation, the transmission ball 16 squeezes the slide plate 15 to move, and in the process of movement, squeezes the spring 4 to adjust its elastic pressure, because the screw rod 5 drives the transmission ball 16 to rotate synchronously during the rotation, thereby avoiding the situation where the spring 4 rotates due to the influence of the rotational force, thereby improving the accuracy of the pressure regulation of the relief valve.

[0028] The transmission ball 16 is embedded in the screw 5, and the end of the screw 5 extending out of the relief valve body 1 is fixedly connected to the knob 3. The outer wall of the slide plate 15 is provided with a mounting groove 18, and a sealing ring 19 tightly connected to the inner wall of the relief valve body 1 is embedded in the mounting groove 18. The sealing ring 19 in the mounting groove 18 keeps the slide plate 15 and the inner wall of the relief valve body 1 sealed.

[0029] like Figure 3 and Figure 4As shown, a connecting cavity 12 is provided at the bottom of the connecting nozzle 2, and a sealing hole 13 connected to the connecting cavity 12 is provided at the top of the connecting nozzle 2. A protrusion 10 is fixed at the bottom end of the lifting plate 7, and a groove 8 is provided at the bottom end of the protrusion 10. A sealing ball 11 is embedded in the groove 8. The bottom end of the sealing ball 11 is tightly connected to the inner wall of the sealing hole 13. When the pressure of the connecting cavity 12 at the bottom of the connecting nozzle 2 is greater than the extrusion force of the spring 4, the sealing ball 11 and the lifting plate 7 are pushed upward, and the sealing ball 11 and the lifting plate 7 are pushed upward through the sealing The sealing hole 13 and the pressure relief hole 6 discharge pressure. Due to the narrow gap between the sealing ball 11 and the sealing hole 13, the pressure can be discharged more easily, thereby improving the accuracy of pressure discharge. The first limiting rod 9 and the second limiting rod 14 are fixed to one end of the lifting plate 7 close to the slide plate 15, respectively. The first limiting rod 9 and the second limiting rod 14 are both embedded in the spring 4. When the pressure is too large, the first limiting rod 9 and the second limiting rod 14 squeeze each other, thereby avoiding the situation where the spring 4 is squeezed and deformed excessively and caused damage.

[0030] The cross-sectional structure diagram of the overflow valve body 1 of the adjustable overflow valve is as follows Figure 2 As shown, its Figure 2 The enlarged schematic diagram of the structure at A is as follows Figure 3 As shown, its Figure 2 The enlarged schematic diagram of the structure at B is as follows Figure 4 shown.

[0031] Working principle: When using the adjustable relief valve of the present technical solution, when the pressure in the connecting cavity 12 at the bottom of the connecting nozzle 2 is greater than the extrusion force of the spring 4, the sealing ball 11 and the lifting plate 7 are pushed upward, and the pressure is discharged through the sealing hole 13 and the pressure relief hole 6. When adjusting the pressure of the relief valve, the hand-held knob 3 drives the screw 5 to rotate, and during the rotation, the transmission ball 16 squeezes the slide plate 15 to move, and during the movement, the spring 4 is squeezed to adjust its elastic pressure. Since the screw 5 drives the transmission ball 16 to rotate synchronously during the rotation, the rotation of the spring 4 caused by the rotational force is avoided, thereby improving the accuracy of the pressure regulation of the relief valve.

[0032] All technical features in this embodiment can be freely combined according to actual needs.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. An adjustable relief valve, comprising a relief valve body (1) and a screw (5) threadedly inserted into one end of the relief valve body (1), wherein a connecting nozzle (2) is embedded and fixed at the other end of the relief valve body (1), characterized in that: A spring (4) is embedded in the overflow valve body (1), and a slide plate (15) is installed at one end of the overflow valve body (1), and a lifting plate (7) for sealing the connection nozzle (2) is installed at the other end of the overflow valve body (1), wherein a pressure relief hole (6) located between the lifting plate (7) and the sealing nozzle is opened on the side wall of the overflow valve body (1), and a positioning groove (17) is opened at one end of the screw rod (5) close to the slide plate (15), and a transmission ball (16) is rotatably clamped between the two positioning grooves (17).

2. An adjustable relief valve according to claim 1, characterized in that: The transmission ball (16) is embedded in the screw rod (5), and one end of the screw rod (5) extending out of the overflow valve body (1) is fixedly connected to a knob (3).

3. The adjustable relief valve according to claim 1, characterized in that: The outer wall of the slide plate (15) is provided with a mounting groove (18), and a sealing ring (19) tightly connected to the inner wall of the overflow valve body (1) is embedded in the mounting groove (18).

4. The adjustable relief valve according to claim 1, characterized in that: A connecting cavity (12) is provided at the bottom of the connecting nozzle (2), and a sealing hole (13) communicating with the connecting cavity (12) is provided at the top of the connecting nozzle (2).

5. An adjustable relief valve according to claim 4, characterized in that: A protrusion (10) is fixed at the bottom end of the lifting plate (7), and a groove (8) is formed at the bottom end of the protrusion (10).

6. An adjustable relief valve according to claim 5, characterized in that: A sealing ball (11) is embedded in the groove (8), and the bottom end of the sealing ball (11) is tightly connected to the inner wall of the sealing hole (13).

7. The adjustable relief valve according to claim 1, characterized in that: A first limiting rod (9) and a second limiting rod (14) are respectively fixed to one end of the lifting plate (7) close to the slide plate (15); the first limiting rod (9) and the second limiting rod (14) are both embedded in the spring (4).

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