Built-in swing check valve
By splitting the pin into the left pin and the right pin, and setting the left boss and the right boss on the inner wall of the valve body, the design of sealing the process hole with the process plug is adopted, the problem of damage and leakage of the existing internal rotary check valve hook device is solved, and more stable connection and higher sealing are achieved.
Patent Information
- Application Number
- CN202520700085.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-15
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2035-04-15
AI Technical Summary
The existing built-in swivel check valve is prone to damage and leakage of hook devices during long-term use, resulting in high maintenance costs and difficult parts to recycle.
An internal swivel check valve is designed. By splitting the pin into a left pin and a right pin, and setting a left boss and a right boss on the inner wall of the valve body, the process plug is used to seal the process hole, which simplifies the disassembly and assembly process of the rocker and eliminates the hook device.
This design improves the connection stability between the valve stem and the valve body, simplifies the disassembly and assembly process of the rocker, reduces maintenance costs, and improves the sealing of the valve body and reduces leakage points.
Smart Images
Figure CN222880430U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of check valves, and more specifically to a built-in swing check valve. Background Art
[0002] The swing check valve is the most commonly used check valve, which is mainly used to prevent the backflow of the medium in the pipeline. The existing swing check valve includes a valve body, a pin shaft, a rocker and a valve disc. The rocker is sleeved on the pin shaft and can drive the valve disc to rotate relative to the pin shaft. According to the connection relationship between the pin shaft and the valve body, it can be divided into an external swing check valve and an internal swing check valve. The pin shaft of the external swing check valve is inserted from the valve body into the valve body, so a leakage point is added on the outer wall of the valve body, which is prone to leakage; the internal swing check valve adopts a hook device fixedly connected to the outer wall of the valve body and the pin shaft is limited in the hook device. Under the long-term erosion of the medium, the hook device is easy to be damaged and the connecting part between the hook device and the inner wall of the valve body is also easy to be damaged, resulting in the valve stem falling off the hook device or the hook device falling off from the inner wall of the valve body. At this time, the hook device needs to be replaced, and the maintenance cost is high; at the same time, the fallen parts flow into the subsequent pipeline with the medium, which is not easy to be recovered and will cause blockage or jamming problems at other nodes of the pipeline. Utility Model Content
[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a built-in swing check valve with good sealing effect and stable structure.
[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an internal swing check valve, comprising a valve body, a pin shaft located in the valve body, a rocker sleeved on the outside of the pin shaft and a valve disc that can move synchronously with the rocker shaft, the pin shaft comprising a coaxial left pin shaft and a right pin shaft, the inner wall of the valve body is provided with a left boss for the left pin shaft to penetrate and a right boss for the right pin shaft to plug into, the valve body is provided with a process hole for the left pin shaft to penetrate into the left boss, the port of the process hole located on the outer wall of the valve body is welded with a process plug, the outer wall of the right pin shaft is provided with a A right limiting ring groove, the diameter of the right pin shaft is smaller than that of the left pin shaft, one end of the right pin shaft is inserted in the rocker, the right boss is threadedly connected with a right thrust screw which can be partially inserted into the right limiting ring groove, the outer wall of the left pin shaft is provided with a left limiting ring groove located in the left boss, the end surface of the left pin shaft facing the right pin shaft is provided with a connecting head which can be inserted into the rocker, the left boss is threadedly connected with a left thrust screw which can be partially inserted into the left limiting ring groove, the connecting head can be detached from the rocker and the rocker can be disassembled and assembled by removing the left thrust screw and moving the left pin shaft.
[0005] As a further improvement of the utility model, a plurality of left stress ring grooves distributed along the length direction of the left pin shaft are arranged on the outer wall of the left pin shaft, and the plurality of left stress ring grooves are all located between the left limiting ring groove and the connector.
[0006] As a further improvement of the present invention, an auxiliary force-bearing annular groove is provided on the outer wall of the connector.
[0007] As a further improvement of the present invention, a right force-bearing annular groove located inside the rocker is provided on the outer wall of the right pin shaft.
[0008] The beneficial effects of the utility model are as follows: by removing the left thrust screw and moving the left pin shaft, the connecting head can be separated from the rocker arm and the rocker arm can be disassembled and assembled. Compared with the existing internal swing check valve, such a design can save the hook device, which makes up for the defects of high maintenance cost and difficult recovery of parts caused by the detachment of the hook device, and the connection stability between the valve stem and the valve body is strong; the design of splitting the pin shaft into a left pin shaft and a right pin shaft can realize the disassembly and assembly of the rocker arm without removing the pin shaft, compared with the design of the existing technology that uses a complete pin shaft to pass through the rocker arm, thereby simplifying the steps of disassembly and assembly of the rocker arm and improving the processing efficiency and maintenance efficiency; the design of sealing the process hole with a process plug can reduce leakage points and improve the sealing of the valve body compared with the existing external swing check valve. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 It is the main sectional view of the utility model;
[0010] Figure 2 for Figure 1 Sectional view at AA in the middle;
[0011] Figure 3 for Figure 1 Cross-section view at the middle BB.
[0012] Figure numerals: 1, valve body; 2, pin shaft; 3, rocker arm; 4, valve disc; 5, left pin shaft; 51, left thrust screw; 52, connecting head; 53, left force ring groove; 54, auxiliary force ring groove; 6, right pin shaft; 61, right limit ring groove; 62, right inner ring groove; 7, left boss; 8, right boss; 9, right thrust screw; 10, left thrust screw; 11, process hole; 12, process plug. DETAILED DESCRIPTION
[0013] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.
[0014] Reference Figures 1 to 3As shown, an internal swing check valve of this embodiment comprises a valve body 1, a pin shaft 2 located in the valve body 1, a rocker 3 sleeved outside the pin shaft 2, and a valve disc 4 capable of synchronously moving with the rocker 3. The rocker 3 is processed with a rotating hole for the pin shaft 2 to be inserted.
[0015] Based on the above-mentioned prior art, the pin shaft 2 includes a left pin shaft 5 and a right pin shaft 6. The diameter of the left pin shaft 5 is larger than that of the right pin shaft 6. The diameter of the right pin shaft 6 matches the diameter of the rotating hole. A left limiting ring groove 51 coaxial with the left pin shaft 5 is processed on the outer wall of the left pin shaft 5. A connecting head 52 matching the rotating hole is integrally formed on one end of the left pin shaft 5. A right limiting ring groove 61 coaxial with the right pin shaft 6 is processed on the outer wall of the right pin shaft 6. When the overall size of the valve body 1 remains unchanged, a left boss 7 and a right boss 8 are turned on the inner wall of the valve body 1, and a hole is drilled from the outside of the valve body 1 to the inside of the valve body 1. , a process hole 11 and a slot are processed on the left boss 7 and the right boss 8 in turn, the inner diameter of the process hole 11 is adapted to the diameter of the left pin 5, and the inner diameter of the slot is adapted to the diameter of the right pin 6, and then holes are drilled on the left boss 7 and the right boss 8 from top to bottom, so that both the left boss 7 and the right boss 8 are processed with threaded holes, and a process plug 12 is inserted into the port of the process hole 11 on the outer wall of the valve body 1 and sealed and fixed by welding, and the distance between the end face of the process plug 12 located in the process hole 11 and the other port of the process hole 11 is less than the total length of the left pin 5 and the connector 52;
[0016] During the assembly process, the left pin shaft 5 and the right pin shaft 6 are respectively installed into the left boss 7 and the right boss 8 from the inner cavity of the valve body 1, one end of the left pin shaft 5 contacts the process plug 12, the connector 52 is partially located outside the process hole 11, one end of the right pin shaft 6 is located outside the right boss 8, and the right limiting ring groove 61 is correspondingly connected to the threaded hole on the right boss 8, the right thrust screw 9 is screwed on the right boss 8, and one end of the right thrust screw 9 extends into the right limiting ring groove 61, and the right pin shaft 6 is positioned at the right The distance between the right pin shaft 6 and the connector 52 is larger than the width of the rocker 3. The rocker 3 is then sleeved on the end of the right pin shaft 6. A tool with a clamping function such as a wrench is used to successively apply force along the length direction of the process hole 11 to the connector 52 and the left pin shaft 5. The connector 52 and the left pin shaft 5 move linearly along the length direction of the process hole 11 as a whole. The connector 52 is gradually inserted into the rocker 3 until the end face of the left pin shaft 5 hits the side face of the rocker 3. The left limiting ring groove 51 is connected with the threaded hole on the left boss 7, and the left thrust screw 10 is screwed on the left boss 7 and one end of the left thrust screw 10 is inserted into the left limiting ring groove 51. The left pin 5 is fixed relative to the left boss 7. The rocker 3 cannot translate relative to the valve body 1 but can rotate relative to the left pin 5 and the right pin 6. If it is necessary to replace the rocker 3, the left thrust screw 10 is screwed so that the end of the left thrust screw 10 is withdrawn from the left limiting ring groove 51, and then a tool with a clamping function such as a wrench is used to successively apply force along the length direction of the process hole 11 to the left pin 5 and the connecting head 52. The connecting head 52 and the left pin 5 move linearly along the length direction of the process hole 11 as a whole, and the connecting head 52 gradually withdraws from the rocker 3 until the connecting head 52 is completely separated from the rocker 3 and the distance between the connecting head 52 and the right pin 6 is greater than the width of the rocker 3. Then the rocker 3 can be replaced, and the left pin 5 and the right pin 6 can also be replaced;
[0017] Compared with the existing internal swing check valve, such a design can eliminate the hook device, making up for the defects of high maintenance cost and difficult recycling of parts caused by the detachment of the hook device, and the connection stability between the valve stem and the valve body is strong; the design of splitting the pin shaft 2 into the left pin shaft 5 and the right pin shaft 6 can realize the disassembly and assembly of the rocker arm 3 without removing the pin shaft 2, simplifying the steps of disassembly and assembly of the rocker arm 3 and improving the processing efficiency and maintenance efficiency; the design of sealing the process hole 11 with the process plug 12 can reduce the leakage points and improve the sealing of the valve body 1 compared with the existing external swing check valve.
[0018] As a specific implementation of the improvement, since the surface of the left pin 5 is smooth, there is a situation where a wrench or other fixture will slip when applying a lateral force to the left pin 5, which affects the disassembly and assembly efficiency of the rocker 3. In order to solve the above-mentioned problem, refer to Figure 2 and Figure 3As shown, a plurality of left force ring grooves 53 distributed along the length direction of the left pin shaft 5 are arranged on the outer wall of the left pin shaft 5, and the plurality of left force ring grooves 53 are all located between the left limit ring groove 51 and the connector 52, and the plurality of left force ring grooves 53 are all adjacent to the connector 52. By using a slender tool such as a screwdriver, one end of the screwdriver is inserted into the left force ring groove 53 and swung to move the left pin shaft 5 along the length direction of the process hole 11. Such a design not only broadens the types of tools that can be used, but also provides an effective force application point for the tool, thereby avoiding the phenomenon that the screwdriver and other tools slip on the left pin shaft 5, and indirectly improving the disassembly efficiency of the rocker 3.
[0019] As a specific implementation method of the improvement, refer to Figure 2 and Figure 3 As shown, an auxiliary force ring groove 54 is provided on the outer wall of the connecting head 52. When the left force ring groove 53 is retracted into the process hole 11 and the distance between the connecting head 52 and the right pin shaft 6 is less than the width of the rocker 3, a slender tool such as a screwdriver is used to insert one end of the screwdriver into the auxiliary force ring groove 54 and swing it to make the left pin shaft 5 move along the length direction of the process hole 11. This design provides an effective force point for the connecting head 52 to avoid slipping of tools such as screwdrivers and the connecting head 52.
[0020] As a specific implementation of the improvement, since the surface of the right pin shaft 6 is smooth and after long-term use, the part of the right pin shaft 6 located in the right boss 8 is clamped with the right boss 8, then applying a pulling force to one end of the right pin shaft 6 is easy to slip, affecting the disassembly efficiency of the right pin shaft 6. In order to solve the above-mentioned problem, refer to Figure 2 and Figure 3 As shown, a right force ring groove 62 located inside the rocker 3 is provided on the outer wall of the right pin shaft 6. The main right force ring groove 62 can be clamped with a wrench or other tool to pull the right pin shaft 6 away from the right boss 8. Such a design can provide an effective force point for the right pin shaft 6 and effectively improve the separation efficiency of the right pin shaft 6 and the right boss 8.
[0021] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.
Claims
1. An internal swing check valve, comprising a valve body (1), a pin (2) located in the valve body (1), a rocker (3) sleeved on the outside of the pin (2), and a valve disc (4) capable of synchronously moving with the rocker (3), characterized in that: The pin shaft (2) comprises a coaxial left pin shaft (5) and a right pin shaft (6); the inner wall of the valve body (1) is provided with a left boss (7) for the left pin shaft (5) to penetrate, and a right boss (8) for the right pin shaft (6) to be plugged into; the valve body (1) is provided with a process hole (11) for the left pin shaft (5) to penetrate into the left boss (7); a process plug (12) is welded to the port of the process hole (11) located on the outer wall of the valve body (1); a right limiting ring groove (61) located in the right boss (8) is provided on the outer wall of the right pin shaft (6); the diameter of the right pin shaft (6) is smaller than the diameter of the left pin shaft (5); one end of the right pin shaft (6) is plugged into In the rocker (3), a right thrust screw (9) is threadedly connected to the right boss (8) and can be partially inserted into the right limiting ring groove (61). The outer wall of the left pin shaft (5) is provided with a left limiting ring groove (51) located in the left boss (7). The end surface of the left pin shaft (5) facing the right pin shaft (6) is provided with a connector (52) that can be plugged into the rocker (3). The left boss (7) is threadedly connected to a left thrust screw (10) that can be partially inserted into the left limiting ring groove (51). By removing the left thrust screw (10) and moving the left pin shaft (5), the connector (52) can be separated from the rocker (3) and the rocker (3) can be disassembled and assembled.
2. The built-in swing check valve according to claim 1, characterized in that: The outer wall of the left pin shaft (5) is provided with a plurality of left force-bearing annular grooves (53) distributed along the length direction of the left pin shaft (5), and the plurality of left force-bearing annular grooves (53) are all located between the left limiting annular groove (51) and the connecting head (52).
3. A built-in swing check valve according to claim 1 or 2, characterized in that: An auxiliary force-bearing annular groove (54) is provided on the outer wall of the connecting head (52).
4. The internal swing check valve according to claim 1 or 2, characterized in that: The outer wall of the right pin shaft (6) is provided with a right force-bearing annular groove (62) located inside the rocker (3).