Normally open check valve
By adopting the design of sliding connection between float ball and guide rod in the check valve, the problem of frequent opening and closing of the valve disc and uneven gas flow is solved, and the gas pressure is stable and uniform output and liquid countercurrent is achieved, which improves measurement accuracy and stopping Reverse effect.
Patent Information
- Application Number
- CN202420997899.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-09
AI Technical Summary
In use, the existing check valves have frequent opening and closing of the valve disc and uneven gas flow, which affects the measurement accuracy.
A normally open check valve is designed, which uses a sliding connection between the float ball and the guide rod. It automatically closes the valve body by inducing the buoyancy of the liquid through the float ball, canceling the traditional spring structure to achieve stable gas passage and rapid closing of the liquid countercurrent.
It achieves stable and uniform gas pressure output, reduces frequent valve disc opening and closing, improves measurement accuracy and reverse effect, and is suitable for normal opening.
Smart Images
Figure CN222209109U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of check valves, in particular to a normally open check valve. Background Art
[0002] A check valve is an automatic valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the backflow of the medium. Its main functions are to prevent the backflow of the medium, the reverse rotation of the pump and the drive motor, and the release of the container medium.
[0003] In the prior art, the name disclosed in the application number: CN201922125300.3 is: double check valve, which includes a valve body, a check valve core is arranged in the valve body, the number of the check valve core is two, including a high-pressure check valve core and a low-pressure check valve core, the low-pressure check valve core is located in front of the high-pressure check valve core, and each check valve core includes a valve seat, a valve disc and a bracket.
[0004] However, when the prior art stop valve is in use, the valve flap will generate resistance. The valve flap will only open when the pressure of the medium is greater than the resistance. When the medium is gas, the pressure of the gas is greater than the resistance of the valve flap, the valve flap opens, and the gas flows through the valve flap. At the same time, the gas pressure will decrease, and the valve flap will close immediately, causing the valve flap to open and close frequently, resulting in uneven gas flow, which affects the accuracy of the measurement. Utility Model Content
[0005] The utility model aims to provide a normally open check valve to solve the problems in the prior art.
[0006] The purpose of the utility model can be achieved through the following technical solutions:
[0007] A normally open check valve comprises a valve body, a through hole is arranged in the valve body, and fixing plates are fixedly connected to both ends of the valve body.
[0008] An upper cover body is fixedly provided at one end of the valve body, and a lower cover body is fixedly provided at the other end. A conical groove 1 is provided at one end of the upper cover body, and a conical groove 2 is provided at one end of the lower cover body. One end of the through hole is connected to the conical groove 1, and the other end is connected to the conical groove 2.
[0009] Furthermore, a guide rod is fixedly connected to the array in the through hole, a floating ball for preventing reverse flow in the valve is slidably arranged in the through hole, and the floating ball is slidably connected to the guide rod.
[0010] Furthermore, the fixing plate is provided with threaded holes distributed in an array.
[0011] Furthermore, a connecting pipe is fixedly provided on the upper cover body, an outer side of the connecting pipe is provided with an external thread, a pipeline is provided on the upper cover body, and a bolt passes through the upper cover body and is connected and fixed with the threaded hole.
[0012] Furthermore, the structure of the lower cover body is substantially the same as that of the upper cover body, the difference being that a groove is provided on the lower cover body, the groove is located between the pipeline and the second conical groove, and an open groove for communication is provided on the side array of the groove.
[0013] Furthermore, the first conical groove is connected to the pipeline on the upper cover body, and the second conical groove is connected to the pipeline on the lower cover body.
[0014] Beneficial effects of the utility model:
[0015] 1. The normally open check valve of the utility model eliminates the spring structure in the traditional check valve. The forward gas can stably pass through the check valve, and the output pressure is stable and uniform. When the liquid flows back, the valve body closes quickly to achieve the check function. The float senses quickly and has high measurement accuracy.
[0016] 2. The normally open check valve of the utility model solves the problem of frequent opening and closing of the valve disc and the phenomenon of uneven gas flow, improves the check effect, ensures the check effect of the valve in the normally open state, has a simple structure and is reliable in use. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The utility model is further described below in conjunction with the accompanying drawings.
[0018] Figure 1 This is a schematic diagram of the structure of the check valve of the utility model;
[0019] Figure 2 It is a cross-sectional view of the check valve of the utility model;
[0020] Figure 3 This is a schematic diagram of the internal structure of the check valve of the utility model;
[0021] Figure 4 This utility model Figure 3 Enlarged structural diagram at A in the middle. DETAILED DESCRIPTION
[0022] 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 of 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.
[0023] A normally open check valve, such as Figure 1 As shown, the check valve includes a valve body 1, which is a straight tube structure. A through hole is arranged in the valve body 1 for water to flow through. Both ends of the valve body 1 are fixedly connected with a fixing plate 11, and the fixing plate 11 is provided with threaded holes distributed in an array.
[0024] An upper cover body 2 is fixedly provided at one end of the valve body 1, and a lower cover body 3 is fixedly provided at the other end. A connecting pipe 6 is fixedly provided on the upper cover body 2, and an external thread is provided on the outer side of the connecting pipe 6. A pipeline 5 is provided on the upper cover body 2, and bolts pass through the upper cover body 2 and are connected and fixed to the threaded holes. The structure of the lower cover body 3 is roughly the same as that of the upper cover body 2, except that a conical groove 21 is provided at one end of the upper cover body 2, and the conical groove 21 is connected to the pipeline 5 on the upper cover body 2, and a conical groove 2 31 is provided at one end of the lower cover body 3, and the conical groove 2 31 is connected to the pipeline 5 on the lower cover body 3.
[0025] One end of the through hole is connected to the conical groove 1 21, and the other end is connected to the conical groove 2 31. An array of guide rods 12 are provided in the through hole, and the guide rods 12 are fixedly connected to the inner wall of the valve body 1. A float 4 is provided in the through hole, and the side of the float 4 is slidably connected to the guide rods 12.
[0026] The lower cover 3 is provided with a groove 32 , which is located between the pipeline 5 and the second conical groove 31 and is used to connect the pipeline 5 . The side of the groove 32 is provided with an array of open grooves 33 , which are connected with the second conical groove 31 and the groove 32 .
[0027] When the float 4 contacts the conical groove 21, the conical groove 21 and the pipeline 5 on the upper cover 2 can be sealed to prevent gas from entering the through hole, thus forming a check function.
[0028] Working principle:
[0029] In actual use, the upper cover body 2 is connected to the air inlet pipe, and the lower cover body 3 is connected to the air outlet pipe. During normal operation, the gas enters from the pipeline 5 of the upper cover body 2, passes through the conical groove 1 21, the through hole, the conical groove 2 31, the open groove 33, and the groove 32, and is discharged from the pipeline 5 of the lower cover body 3. At this time, under the combined effect of gravity and gas thrust, the float 4 is located on the conical groove 2 31, the valve body remains in an open state, and the gas passes smoothly.
[0030] When liquid reflux occurs in the air outlet pipe of the lower cover body 3 and the liquid flows from the tapered groove 2 31 into the valve body 1, the float 4 floats upward along the side of the guide rod 12 under the buoyancy of the liquid until the float 4 abuts against the tapered groove 1 21, thereby sealing and preventing the liquid from flowing back into the air inlet pipe and preventing diversion. The response is obvious and the stopping is rapid.
[0031] In actual use, the normally open check valve can be used in corrosive media and radioactive working environments, with an applicable pressure of -100KP-500KP. There is no need to adjust the valve, and the valve body remains normally open. In the event of liquid backflow, the float 4 automatically performs a check operation under the action of buoyancy, without the need for frequent switching. In the actual working process, the gas pressure output by the valve body is stable and does not affect the use and measurement.
[0032] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.
Claims
1. A normally open check valve, characterized in that: The check valve comprises a valve body (1), a through hole is provided in the valve body (1), and both ends of the valve body (1) are fixedly connected to fixing plates (11); An upper cover body (2) is fixedly provided at one end of the valve body (1), and a lower cover body (3) is fixedly provided at the other end; a conical groove 1 (21) is provided at one end of the upper cover body (2), and a conical groove 2 (31) is provided at one end of the lower cover body (3); one end of the through hole is connected to the conical groove 1 (21), and the other end is connected to the conical groove 2 (31).
2. A normally open check valve according to claim 1, characterized in that: A guide rod (12) is fixedly connected to the array in the through holes, and a floating ball (4) for preventing reverse flow in the valve is slidably arranged in the through holes, and the floating ball (4) is slidably connected to the guide rod (12).
3. A normally open check valve according to claim 2, characterized in that: The fixing plate (11) is provided with threaded holes distributed in an array.
4. A normally open check valve according to claim 1, characterized in that: A connecting pipe (6) is fixedly provided on the upper cover body (2), the outer side of the connecting pipe (6) is provided with an external thread, a pipeline (5) is provided on the upper cover body (2), and bolts pass through the upper cover body (2) and are connected and fixed with the threaded holes.
5. A normally open check valve according to claim 4, characterized in that: The structure of the lower cover body (3) is substantially the same as that of the upper cover body (2), the difference being that a groove (32) is provided on the lower cover body (3), the groove (32) is located between the pipeline (5) and the second conical groove (31), and an open groove (33) for communication is provided on the side array of the groove (32).
6. A normally open check valve according to claim 5, characterized in that: The conical groove 1 (21) is connected to the pipeline (5) on the upper cover body (2), and the conical groove 2 (31) is connected to the pipeline (5) on the lower cover body (3).