Stop valve
By introducing the design of steel ball movable hole and limit shaft in the stop valve, the movement speed of the valve core is controlled, the problems of jitter and pressure loss in the hydraulic system are solved, and stable opening and closing are achieved.
Patent Information
- Application Number
- CN202422919958.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing stop valves are prone to vibration or large system pressure loss when the hydraulic oil pressure changes.
A stop valve structure was designed, including a valve body, a valve core, a steel ball movable hole, a limit shaft and a reset device. The movement speed of the valve core was controlled by the pressure change of the hydraulic oil. The sealing cooperation between the steel ball and the pressure taking hole and the return oil clearance of the limit shaft were used to achieve the static settlement of the valve core, thereby reducing the pressure loss of the system.
It reduces vibration during opening and closing, reduces system pressure loss, and meets static settlement requirements.
Smart Images
Figure CN223424359U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a stop valve. Background Art
[0002] Conventional stop valves consist of a valve body and a valve core. The valve body is provided with an oil inlet passage, which connects to the front of the valve core. To open the stop valve, hydraulic oil flows through the oil inlet passage to the front of the valve core, pushing the valve core backward. To close the stop valve, the hydraulic oil pressure in the oil inlet passage decreases, causing the valve core to move forward.
[0003] The above technical solution has the following disadvantages: if the hydraulic oil pressure in the oil inlet circuit drops quickly and the valve core moves forward quickly, jitter problems will occur; if the hydraulic oil pressure in the oil inlet circuit drops slowly, although jitter problems will not occur, the oil pump needs to continuously provide pressure for the hydraulic oil in the oil inlet circuit for a long time, and the system pressure loss is large. Utility Model Content
[0004] The purpose of this utility model is to provide a stop valve to solve the above problems, so as to meet the requirements of static settlement and reduce the pressure loss of the system.
[0005] To achieve the above-mentioned purpose, the utility model discloses a stop valve, which includes a valve body and a valve core. A first oil inlet circuit and a first oil return circuit are opened on the valve body. The first oil inlet circuit is connected to a pressure taking hole and a steel ball movable hole. The steel ball movable hole is connected to the front of the valve core. The first oil return circuit is connected to the front of the valve core. A steel ball is placed in the steel ball movable hole. The diameter of the steel ball is larger than the diameter of the pressure taking hole and smaller than the diameter of the steel ball movable hole. A reset device is provided between the rear end of the valve core and the valve body. A limiting shaft whose side can be against the front end of the valve core is installed in the first oil return circuit. There is an oil return gap between the limiting shaft and the first oil return circuit.
[0006] When the shut-off valve needs to be opened, hydraulic oil flows through the first oil inlet line, the pressure-taking hole, and the steel ball's movable hole to the front of the valve core, pushing the valve core backward. When the shut-off valve needs to be closed, the hydraulic oil pressure in the first oil inlet line decreases, the steel ball seals against the pressure-taking hole, and a certain pressure is maintained in front of the valve core for a certain period of time. The excess pressure slowly dissipates through the oil return gap between the limit shaft and the first oil return line. In this way, the valve core slowly moves forward under the action of the reset device, meeting the static settlement requirement. This structure can reduce the system's pressure loss while meeting the opening and closing requirements of the shut-off valve.
[0007] Preferably, the first oil return path passes through the steel ball movable hole, and a limit shaft oil groove capable of connecting the steel ball movable hole and the front of the valve core is opened on the limit shaft.
[0008] When the stop valve needs to be opened, the hydraulic oil reaches the front of the valve core through the limit shaft oil groove, and the first return oil path runs through the movable hole of the steel ball, which is convenient for processing and manufacturing.
[0009] Preferably, a first limit spring located on the side of the limit shaft close to the outside of the first oil return circuit and a second limit spring located on the side of the limit shaft close to the inside of the first oil return circuit are installed in the first oil return circuit.
[0010] This structure ensures a stable position of the limit shaft, making installation and use of the limit shaft convenient.
[0011] Preferably, the front end of the valve core has a limiting protrusion that can abut against the limiting shaft, and the diameter of the limiting protrusion is smaller than the diameter of the valve core.
[0012] When the limiting protrusion and the limiting shaft are against each other, an annular cavity is formed around the limiting protrusion. When the stop valve needs to be opened, the hydraulic oil enters the annular cavity. In the initial stage, the contact area between the hydraulic oil and the front end of the valve core can be increased, which is conducive to pushing the valve core to move backward. It is very convenient to use.
[0013] Preferably, the steel ball movable hole is connected to the outside of the valve body, and a steel ball movable hole plug is installed on the outside of the steel ball movable hole.
[0014] This structure is convenient for processing the movable hole of the steel ball and convenient for placing the steel ball.
[0015] Preferably, the reset device comprises a valve core spring.
[0016] This structure is low-cost. When the shut-off valve needs to be closed, the hydraulic oil pressure in the first oil inlet circuit decreases, the steel ball seals with the pressure-taking hole, and a certain pressure is maintained in front of the valve core for a certain period of time. The excess pressure is slowly released through the return oil gap between the limit shaft and the first oil return circuit. In this way, the valve core slowly moves forward under the action of the valve core spring, meeting the static settlement requirement.
[0017] Preferably, a valve core plug is installed on the valve body and is located behind the valve core. A valve core spring groove is provided on the valve core plug, and the rear end of the valve core spring is located in the valve core spring groove.
[0018] When in use, one end of the valve core spring is against the bottom of the valve core spring groove, and the other end of the valve core spring is against the rear end of the valve core. When the stop valve needs to be closed, the hydraulic oil pressure of the first oil inlet circuit is reduced, and the steel ball is sealed with the pressure taking hole. A certain pressure is maintained in front of the valve core for a certain period of time, and the excess pressure will slowly leak out through the return oil gap between the limit shaft and the first return oil circuit. In this way, the valve core will slowly move forward under the action of the valve core spring to meet the static settlement requirements.
[0019] Preferably, a second oil inlet oil circuit and a second oil return oil circuit are further provided on the valve body, and a valve core oil groove capable of connecting the second oil inlet oil circuit and the second oil return oil circuit is provided on the valve core.
[0020] When the stop valve is opened, the valve core oil groove is connected to the second oil inlet oil circuit and the second oil return oil circuit. When the stop valve is closed, the valve core oil groove is not connected to the second oil inlet oil circuit and the second oil return oil circuit.
[0021] Preferably, the valve body is equipped with a first valve sleeve and a second valve sleeve which are sleeved on the valve core. The first valve sleeve is provided with a first valve sleeve oil hole connected to the second oil inlet circuit, and the second valve sleeve is provided with a second valve sleeve oil hole connected to the second oil return circuit.
[0022] This structure is convenient for processing and manufacturing.
[0023] Preferably, the valve core is provided with a first limiting ring capable of abutting against the front portion of the oil hole of the second valve sleeve, and a second limiting ring capable of abutting against the rear portion of the oil hole of the second valve sleeve.
[0024] When the stop valve is opened, the second limiting ring abuts against the rear part of the second valve sleeve oil hole, and the valve core oil groove is connected to the second oil inlet oil circuit and the second oil return oil circuit. When the stop valve is closed, the first limiting ring abuts against the front part of the second valve sleeve oil hole, and the valve core oil groove is not connected to the second oil inlet oil circuit and the second oil return oil circuit.
[0025] In summary, the beneficial effect of the present invention is that when the shut-off valve needs to be closed, the hydraulic oil pressure in the first oil inlet circuit decreases, the steel ball seals with the pressure-taking hole, and a certain pressure is maintained in front of the valve core for a certain period of time. The excess pressure is slowly released through the oil return gap between the limit shaft and the first oil return circuit. In this way, the valve core slowly moves forward under the action of the reset device, meeting the static settlement requirement. This structure can reduce the pressure loss of the system while meeting the opening and closing requirements of the shut-off valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 This is a structural diagram of a stop valve of the utility model;
[0027] Figure 2 yes Figure 1 Structural diagram of the middle section AA;
[0028] Figure 3 yes Figure 1 Schematic diagram of the enlarged structure of part B in the middle.
[0029] In the figure: 1. Valve body; 2. First oil inlet circuit; 3. Second oil inlet circuit; 4. Second oil return circuit; 5. Valve core; 6. First valve sleeve; 7. Second valve sleeve; 8. First valve sleeve oil hole; 9. Second valve sleeve oil hole; 10. Valve core plug; 11. Valve core spring groove; 12. Valve core spring; 13. Limiting protrusion; 14. Pressure taking hole; 15. Steel ball; 16. Steel ball movable hole; 17. Limiting shaft; 18. Valve core oil groove; 19. Limiting shaft oil groove; 20. First limiting spring; 21. First oil return circuit; 22. Second limiting spring; 23. First limiting ring; 24. Second limiting ring; 25. Steel ball movable hole plug. DETAILED DESCRIPTION
[0030] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0031] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.
[0033] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:
[0035] like Figures 1 to 3As shown, a kind of stop valve, including valve body 1 and valve core 5, first oil inlet oil path 2 and first oil return oil path 21 are set on valve body 1, first oil inlet oil path 2 is communicated with pressure hole 14 and steel ball movable hole 16, steel ball movable hole 16 is connected with the front of valve core 5, first oil return oil path 21 is connected with the front of valve core 5, steel ball 15 is placed in steel ball movable hole 16, the diameter of steel ball 15 is greater than the diameter of pressure hole 14 and less than the diameter of steel ball movable hole 16, reset device is arranged between the rear end of valve core 5 and valve body 1, limiting shaft 17 is installed in first oil return oil path 21, limiting shaft 17 can be abutted with the front end of valve core 5, and oil return gap is formed between limiting shaft 17 and first oil return oil path 21.When the stop valve needs to be opened, hydraulic oil reaches the front of valve core 5 by first oil inlet oil path 2, pressure hole 14 and steel ball movable hole 16, and pushes valve core 5 to move backward;When the stop valve needs to be closed, the hydraulic oil pressure of first oil inlet oil path 2 is reduced, steel ball 15 is sealed with pressure hole 14, the front of valve core 5 maintains a certain pressure for a certain time, and the excess pressure is slowly leaked through the oil return gap between limiting shaft 17 and first oil return oil path 21, so that valve core 5 slowly moves forward under the action of reset device, to meet the static settlement requirement. Through this structure, the pressure loss of the system can be reduced, and the opening and closing of the stop valve can be met.
[0036] Specifically, first oil return oil path 21 penetrates steel ball movable hole 16, limiting shaft oil groove 19 is formed in limiting shaft 17, and limiting shaft oil groove 19 can be connected with steel ball movable hole 16 and the front of valve core 5. When the stop valve needs to be opened, hydraulic oil reaches the front of valve core 5 through limiting shaft oil groove 19, first oil return oil path 21 penetrates steel ball movable hole 16, which is convenient for processing and manufacturing. First limiting spring 20 is installed in first oil return oil path 21, first limiting spring 20 is located on the side of limiting shaft 17 close to the outside of first oil return oil path 21, and second limiting spring 22 is located on the side of limiting shaft 17 close to the inside of first oil return oil path 21. This structure of limiting shaft 17 is stable in position, which is convenient for installation and use of limiting shaft 17.
[0037] Specifically, the front end of valve core 5 has limiting protrusion 13, and the diameter of limiting protrusion 13 is less than the diameter of valve core 5. When limiting protrusion 13 abuts against limiting shaft 17, an annular cavity is formed around limiting protrusion 13, hydraulic oil enters the annular cavity when the stop valve needs to be opened, which can increase the contact area of hydraulic oil and the front end of valve core 5 in initial stage, which is beneficial to push valve core 5 to move backward, and is very convenient to use.
[0038] Specifically, steel ball movable hole 16 is connected with the outside of valve body 1, and steel ball movable hole plug 25 is installed on the outside of steel ball movable hole 16. This structure is convenient for processing of steel ball movable hole 16 and placing steel ball 15.
[0039] Specifically, the reset device includes a valve core spring 12. This structure has a low cost. When the stop valve needs to be closed, the hydraulic oil pressure of the first oil inlet circuit 2 is reduced, the steel ball 15 is sealed with the pressure taking hole 14, and a certain pressure is maintained in front of the valve core 5 for a certain period of time, and the excess pressure will slowly leak out through the return oil gap between the limit shaft 17 and the first return oil circuit 21. In this way, the valve core 5 will slowly move forward under the action of the valve core spring 12 to meet the static settlement requirement. A valve core plug 10 is installed on the valve body 1 and is located behind the valve core 5. A valve core spring groove 11 is provided on the valve core plug 10, and the rear end of the valve core spring 12 is located in the valve core spring groove 11. When in use, one end of the valve core spring 12 is against the bottom of the valve core spring groove 11, and the other end of the valve core spring 12 is against the rear end of the valve core 5. When the stop valve needs to be closed, the hydraulic oil pressure of the first oil inlet circuit 2 is reduced, and the steel ball 15 is sealed with the pressure taking hole 14. A certain pressure is maintained in front of the valve core 5 for a certain period of time, and the excess pressure will slowly leak out through the return oil gap between the limit shaft 17 and the first return oil circuit 21. In this way, the valve core 5 will slowly move forward under the action of the valve core spring 12 to meet the static settlement requirements.
[0040] Specifically, the valve body 1 is further provided with a second oil inlet passage 3 and a second oil return passage 4. The valve core 5 is provided with a valve core oil groove 18 that connects the second oil inlet passage 3 and the second oil return passage 4. When the shut-off valve is open, the valve core oil groove 18 connects the second oil inlet passage 3 and the second oil return passage 4. When the shut-off valve is closed, the valve core oil groove 18 is disconnected from the second oil inlet passage 3 and the second oil return passage 4. The valve body 1 is mounted with a first valve sleeve 6 and a second valve sleeve 7 that are sleeved onto the valve core 5. The first valve sleeve 6 defines a first valve sleeve oil hole 8 that connects to the second oil inlet passage 3, while the second valve sleeve 7 defines a second valve sleeve oil hole 9 that connects to the second oil return passage 4. This structure facilitates processing and manufacturing. The valve core 5 is provided with a first retaining ring 23 that abuts against the front of the second valve sleeve oil hole 9, and a second retaining ring 24 that abuts against the rear of the second valve sleeve oil hole 9. When the stop valve is opened, the second limiting ring 24 abuts against the rear part of the second valve sleeve oil hole 9, and the valve core oil groove 18 is connected to the second oil inlet oil circuit 3 and the second oil return oil circuit 4. When the stop valve is closed, the first limiting ring 23 abuts against the front part of the second valve sleeve oil hole 9, and the valve core oil groove 18 is not connected to the second oil inlet oil circuit 3 and the second oil return oil circuit 4.
[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.
Claims
1. A stop valve, comprising a valve body (1) and a valve core (5), characterized in that: The valve body (1) is provided with a first oil inlet passage (2) and a first oil return passage (21). The first oil inlet passage (2) is connected to a pressure-taking hole (14) and a steel ball movable hole (16). The steel ball movable hole (16) is connected to the front of the valve core (5). The first oil return passage (21) is connected to the front of the valve core (5). A steel ball (15) is placed in the steel ball movable hole (16). The diameter of the steel ball (15) is larger than the diameter of the pressure-taking hole (14) and smaller than the diameter of the steel ball movable hole (16). A reset device is provided between the rear end of the valve core (5) and the valve body (1). A limiting shaft (17) whose side can abut against the front end of the valve core (5) is installed in the first oil return passage (21). An oil return gap is provided between the limiting shaft (17) and the first oil return passage (21).
2. The stop valve according to claim 1, wherein: The first oil return path (21) passes through the steel ball movable hole (16), and a limit shaft oil groove (19) capable of connecting the steel ball movable hole (16) and the front of the valve core (5) is provided on the limit shaft (17).
3. The stop valve according to claim 1, wherein: A first limit spring (20) located on the side of the limit shaft (17) close to the outside of the first oil return circuit (21) and a second limit spring (22) located on the side of the limit shaft (17) close to the inside of the first oil return circuit (21) are installed in the first oil return circuit (21).
4. The stop valve according to claim 1, wherein: The front end of the valve core (5) is provided with a limiting protrusion (13) capable of abutting against the limiting shaft (17), and the diameter of the limiting protrusion (13) is smaller than the diameter of the valve core (5).
5. The stop valve according to claim 1, wherein: The steel ball movable hole (16) is communicated with the outside of the valve body (1), and a steel ball movable hole plug (25) is installed on the outside of the steel ball movable hole (16).
6. The stop valve according to claim 1, wherein: The resetting device comprises a valve core spring (12).
7. The stop valve according to claim 6, wherein: A valve core plug (10) is mounted on the valve body (1) and is located behind the valve core (5). A valve core spring groove (11) is formed on the valve core plug (10), and a rear end of the valve core spring (12) is located in the valve core spring groove (11).
8. The stop valve according to any one of claims 1 to 7, characterized in that A second oil inlet passage (3) and a second oil return passage (4) are also provided on the valve body (1), and a valve core oil groove (18) capable of connecting the second oil inlet passage (3) and the second oil return passage (4) is provided on the valve core (5).
9. The stop valve according to claim 8, wherein: The valve body (1) is provided with a first valve sleeve (6) and a second valve sleeve (7) which are sleeved on the valve core (5); the first valve sleeve (6) is provided with a first valve sleeve oil hole (8) which is connected to the second oil inlet oil circuit (3); the second valve sleeve (7) is provided with a second valve sleeve oil hole (9) which is connected to the second oil return oil circuit (4).
10. The stop valve according to claim 9, wherein The valve core (5) is provided with a first limiting ring (23) capable of abutting against the front portion of the second valve sleeve oil hole (9), and a second limiting ring (24) capable of abutting against the rear portion of the second valve sleeve oil hole (9).