Hydraulic constant pressure valve

Abstract

The utility model discloses a kind of hydraulic constant pressure valves, including the valve housing of hollow sleeve structure, valve housing bottom end opening is liquid outlet, the side wall of valve housing is sequentially provided with liquid inlet, pressure relief port one and pressure relief port two from below to above and its internal cavity is communicated;Valve housing is sequentially fixedly sleeved with inner valve sleeve and outer valve sleeve, inner valve sleeve is equipped with valve core one, valve core one top end is equipped with the accommodating slot for accommodating spring one, the top end of spring one and outer valve sleeve bottom end are abutted, the position of inner valve sleeve side wall corresponding pressure relief port one is equipped with pressure relief hole one;Valve core one bottom end is equipped with the pressure relief micropore being communicated with accommodating slot;Outer valve sleeve outer wall is equipped with pressure relief hole three in the position corresponding pressure relief port two, outer valve sleeve is equipped with pilot pressure relief valve, the inlet of pilot pressure relief valve is communicated with inner valve sleeve, the outlet of pilot pressure relief valve is communicated with pressure relief port two, the utility model has multistage pressure relief function, hydraulic oil circuit constant pressure effect is good, and structure is simple and the like.

Description

Technical Field

[0001] This utility model relates to the field of pressure regulating valve technology, specifically a hydraulic pressure regulating valve. Background Technology

[0002] A pressure regulating valve, also known as a pressure control valve, is a commonly used industrial control valve. Its basic principle is to control the flow rate of the medium by adjusting the cross-sectional area of ​​the fluid passage, thereby maintaining stable pressure within the system. A pressure regulating valve typically consists of a valve body, valve body, spring, and regulating device. When the medium flows into the pressure regulating valve through its inlet, the valve automatically adjusts its opening according to changes in system pressure to control the flow rate. For example, a pressure regulating valve is disclosed in patent publication number CN213745087U. However, this type of valve has drawbacks, such as lacking multi-stage pressure relief and having poor pressure regulation performance in the hydraulic circuit. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a hydraulic pressure regulating valve with multi-stage pressure relief function, good hydraulic oil circuit pressure regulating effect, simple structure, and easy processing and assembly, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic pressure regulating valve, comprising a valve shell, wherein the valve shell is a hollow sleeve structure, the bottom opening of the valve shell is an outlet, and the side wall of the valve shell is provided with an inlet, a pressure relief port one, and a pressure relief port two connected to the internal cavity, sequentially from bottom to top; an inner valve sleeve and an outer valve sleeve are fixedly fitted inside the valve shell, the inner valve sleeve contains a valve core one, the top of the valve core one has a receiving groove for accommodating a spring one, the top of the spring one abuts against the bottom of the outer valve sleeve, and a pressure relief hole one is provided on the side wall of the inner valve sleeve at the position corresponding to the pressure relief port one; a pressure relief micro-hole is provided at the bottom of the valve core one and connected to the receiving groove; a pressure relief hole three is provided on the outer wall of the outer valve sleeve at the position corresponding to the pressure relief port two, and a pilot pressure relief valve is provided inside the outer valve sleeve, wherein the inlet of the pilot pressure relief valve is connected to the inner valve sleeve, and the outlet of the pilot pressure relief valve is connected to the pressure relief port two.

[0005] Furthermore, the pilot pressure relief valve includes a threaded sleeve fixed inside the outer valve sleeve. The bottom end of the threaded sleeve has a valve hole that serves as the inlet of the pilot pressure relief valve. A valve core two, a spring two, and an adjusting screw plug are sequentially fitted inside the threaded sleeve. The adjusting screw plug is threaded inside the threaded sleeve, and the valve core two abuts against the valve hole through the spring two. A pressure relief hole four, which communicates with the pressure relief hole three, is opened on the side wall of the threaded sleeve at the position corresponding to the valve core two.

[0006] Furthermore, the elastic force of the second spring is less than that of the first spring.

[0007] Furthermore, a connecting hole is provided on the side wall of the threaded sleeve above the corresponding valve core two, and the connecting hole is connected to the pressure relief hole three.

[0008] Furthermore, a second pressure relief hole is provided on the inner valve sleeve sidewall above the first pressure relief hole, and the diameter of the second pressure relief hole is larger than that of the first pressure relief hole.

[0009] Furthermore, a retaining ring is fixedly provided at the bottom of the inner valve sleeve, which is used to prevent the valve core from dislodging from the bottom of the inner valve sleeve; a spring seat is fixedly provided at the bottom of the outer valve sleeve, and the top of the spring abuts against the spring seat.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: When the oil pressure between the inlet and outlet of the valve body is low, the oil pushes open the valve core two and passes through the valve hole, pressure relief hole four, and pressure relief hole three in sequence before releasing pressure from pressure relief port two. When the oil pressure between the inlet and outlet of the valve body increases, the oil pushes the valve core one towards the outer valve sleeve, causing pressure relief hole one to open, and the oil flows through pressure relief hole one to pressure relief port one to release pressure. When the oil pressure continues to increase, the oil pushes the valve core one further towards the outer valve sleeve, causing pressure relief hole one and pressure relief hole two to open simultaneously, and the oil flows through pressure relief hole one and pressure relief hole two to pressure relief port one to release pressure. This multi-stage pressure relief function provides good hydraulic oil circuit pressure stabilization, has a simple structure, and is easy to process and assemble. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the inner valve sleeve structure of this utility model; Figure 4 This is a schematic diagram of the valve core structure of this utility model; Figure 5 This is a schematic diagram of the outer valve sleeve structure of this utility model; Figure 6 This is a schematic diagram of the explosion of the pilot-operated pressure relief valve of this utility model; Figure 7 This is a schematic diagram of the screw sleeve structure of this utility model; Figure 8 This is a cross-sectional view of the pilot-operated pressure relief valve of this utility model; Figure 9 This is a cross-sectional view of the present invention.

[0012] In the diagram: 1. Valve housing; 11. Inlet; 12. Outlet; 13. Pressure relief port one; 14. Pressure relief port two; 2. Inner valve sleeve; 21. Pressure relief hole one; 22. Pressure relief hole two; 3. Valve core one; 31. Pressure relief micro-orifice; 4. Outer valve sleeve; 41. Pressure relief hole three; 5. Spring seat; 6. Spring one; 7. Pilot pressure relief valve; 71. Screw sleeve; 711. Valve hole; 712. Pressure relief hole four; 713. Connecting hole; 72. Valve core two; 73. Spring two; 74. Adjusting plug. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Example Please see Figure 1-2 and Figure 9 This utility model provides a technical solution: a hydraulic pressure regulating valve, including a valve shell 1, the valve shell 1 being a hollow sleeve structure, the bottom opening of the valve shell 1 being a liquid outlet 12, and the side wall of the valve shell 1 having a liquid inlet 11, a pressure relief port 13 and a pressure relief port 14 connected to its internal cavity in sequence from bottom to top; an inner valve sleeve 2 and an outer valve sleeve 4 are fixedly fitted inside the valve shell 1 in sequence, the inner valve sleeve 2 having a valve core 3, the top of the valve core 3 having a receiving groove for accommodating a spring 6, the top of the spring 6 abutting against the bottom of the outer valve sleeve 4, and a retaining spring fixedly provided inside the bottom of the inner valve sleeve 2 for preventing the valve core 3 from dislodging from the bottom of the inner valve sleeve 2; Please refer to the following: Figure 2-3 A pressure relief hole 21 is provided on the side wall of the inner valve sleeve 2 at the position corresponding to the pressure relief port 13. A pressure relief hole 22 is provided on the side wall of the inner valve sleeve 2 above the pressure relief hole 21, and the diameter of the pressure relief hole 22 is larger than the diameter of the pressure relief hole 21. A pressure relief micro-hole 31 communicating with the receiving groove is provided at the bottom end of the valve core 3. Please refer to the following: Figure 5-9 The outer valve sleeve 4 has a pressure relief hole 3 41 at the position corresponding to the pressure relief port 2 14 on its outer wall; the outer valve sleeve 4 has a pilot pressure relief valve 7, which includes a screw sleeve 71 fixed inside the outer valve sleeve 4. The bottom end of the screw sleeve 71 has a valve hole 711 as the inlet of the pilot pressure relief valve 7. The screw sleeve 71 is fitted with a valve core 2 72, a spring 2 73 and an adjusting screw plug 74 in sequence. The adjusting screw plug 74 is threaded inside the screw sleeve 71, and the valve core 2 72 abuts against the valve hole 711 through the spring 2 73. The elastic force of the spring 2 73 is less than that of the spring 1 6. The side wall of the screw sleeve 71 has a pressure relief hole 4 712 at the position corresponding to the valve core 2 72, which is connected to the pressure relief hole 3 41; the side wall of the screw sleeve 71 has a connecting hole 713 on the upper side corresponding to the valve core 2 72, and the connecting hole 713 is connected to the pressure relief hole 3 41.

[0015] During use: the oil flows into the valve body 1 through the inlet 11 and then flows out through the outlet 12. At the same time, the oil enters the valve core 3 and the inner valve sleeve 2 through the pressure relief micro-hole 31. When the oil pressure between the inlet 11 and outlet 12 inside the valve housing 1 increases, because the elastic force of spring 6 is greater than that of spring 73, the pressure exerted by the oil in the inner valve sleeve 2 on the valve core 72 is greater than that exerted by spring 73. The valve hole 711 opens, and the oil pushes open the valve core 72 and passes through the valve hole 711, the pressure relief hole 412, and the pressure relief hole 31 in sequence before being released from the pressure relief port 14. The oil pressure released from the pressure relief port 14 can be adjusted by turning the adjusting screw 74. When the oil pressure between the inlet 11 and outlet 12 inside the valve body 1 continues to increase, the pressure exerted by the oil at the inlet 11 on the valve core 3 is greater than the elastic force exerted by the spring 6, causing the valve core 3 to move towards the outer valve sleeve 4, thus opening the pressure relief hole 21. The oil flows through the pressure relief hole 21 to the pressure relief port 13 to relieve pressure. When the oil pressure further increases, the valve core 3 continues to move towards the outer valve sleeve 4, thus opening the pressure relief hole 22. At this time, the oil flows through the pressure relief hole 21 and the pressure relief hole 22 to the pressure relief port 13 to relieve pressure.

[0016] Furthermore, a spring seat 5 is fixedly provided at the bottom end of the outer valve sleeve 4, and the top end of the spring-6 abuts against the spring seat 5; the spring seat 5 improves the stability of the spring-6 when it extends or retracts.

[0017] The hydraulic pressure regulating valve disclosed in this embodiment has the following characteristics: When the oil pressure between the inlet 11 and outlet 12 in the valve housing 1 is low, the oil pushes open the valve core 72 and passes through the valve hole 711, the pressure relief hole 712, and the pressure relief hole 41 in sequence before releasing pressure from the pressure relief port 14 (first-stage pressure relief); When the oil pressure between the inlet 11 and outlet 12 in the valve housing 1 increases, the oil pushes the valve core 3 to move towards the outer valve sleeve 4, causing the pressure relief hole 21 to open, and the oil flows through the pressure relief hole 21 to the pressure relief port 13 to release pressure (second-stage pressure relief); When the oil pressure continues to increase, the oil pushes the valve core 3 to continue moving towards the outer valve sleeve 4, causing the pressure relief hole 21 and the pressure relief hole 22 to open simultaneously, and the oil flows through the pressure relief hole 21 and the pressure relief hole 22 to the pressure relief port 13 to release pressure (third-stage pressure relief); It has a multi-stage pressure relief function, good hydraulic oil circuit pressure regulating effect, simple structure, and is easy to process and assemble.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic pressure regulating valve, comprising a valve body, characterized in that: The valve housing is a hollow sleeve structure with a liquid outlet at the bottom. From bottom to top, the side wall of the valve housing has an inlet, a pressure relief port one, and a pressure relief port two, all connected to its internal cavity. An inner valve sleeve and an outer valve sleeve are fixedly fitted inside the valve housing. The inner valve sleeve contains a valve core one, with a receiving groove at its top for accommodating a spring one. The top of the spring one abuts against the bottom of the outer valve sleeve. A pressure relief hole one is located on the side wall of the inner valve sleeve corresponding to pressure relief port one. A pressure relief micro-hole is located at the bottom of the valve core one, connected to the receiving groove. A pressure relief hole three is located on the outer wall of the outer valve sleeve corresponding to pressure relief port two. A pilot pressure relief valve is located inside the outer valve sleeve, with its inlet connected to the inner valve sleeve and its outlet connected to pressure relief port two.

2. A hydraulic pressure regulating valve according to claim 1, characterized in that: The pilot pressure relief valve includes a screw sleeve fixed inside an outer valve sleeve. The bottom end of the screw sleeve has a valve hole that serves as the inlet of the pilot pressure relief valve. A valve core two, a spring two, and an adjusting screw plug are sequentially fitted inside the screw sleeve. The adjusting screw plug is threaded inside the screw sleeve, and the valve core two abuts against the valve hole through the spring two. A pressure relief hole four, which communicates with the pressure relief hole three, is opened on the side wall of the screw sleeve at the position corresponding to the valve core two.

3. A hydraulic pressure regulating valve according to claim 2, characterized in that: The elastic force of spring two is less than that of spring one.

4. A hydraulic pressure regulating valve according to claim 2, characterized in that: A connecting hole is provided on the side wall of the threaded sleeve above the corresponding valve core two, and the connecting hole is connected to the pressure relief hole three.

5. A hydraulic pressure regulating valve according to claim 1, characterized in that: A second pressure relief hole is provided on the inner valve sleeve sidewall above the first pressure relief hole, and the diameter of the second pressure relief hole is larger than that of the first pressure relief hole.

6. A hydraulic pressure regulating valve according to claim 1, characterized in that: A retaining ring is fixedly provided at the bottom of the inner valve sleeve, which is used to prevent the valve core from coming out of the bottom of the inner valve sleeve; a spring seat is fixedly provided at the bottom of the outer valve sleeve, and the top of the spring abuts against the spring seat.

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