Check valve

Abstract

The utility model relates to a check valve. The check valve comprises a body adopting an integrated cavity, a sealing piece movably contained in the body and an elastic element arranged on the sealing piece in a sleeving mode. At least two circular-truncated-cone-shaped sealing faces are arranged in the axis direction of the body in an array mode. And the sealing piece is in surface contact sealing with the sealing surface. During normal circulation, positive pressure or negative pressure drives the sealing element from the pressure difference in the pressure cavity and the elastic force of an elastic element spring arranged on the sealing element in a sleeving mode, the sealing element is pushed to move towards the lower air outlet, an airflow channel is cut off, pressure in the pressure cavity applies pressure to the sealing element in the whole using process, a closed vacuum cavity is generated, and the sealing element is sealed. The pressure difference continues to be increased, pressure is further applied to enable the sealing ring to be in contact with the second sealing position after being sealed with the first sealing position of the sealing face, and larger deformation is still found on the contact face during contact, so that secondary sealing is formed, the sealing effect is better and more effectively improved, the reverse flow is completely eradicated, the vacuum non-return effect is obvious, and the instant non-return effect is extremely good. And the use is stable and effective.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a check valve. Background Art

[0002] Nowadays, there are many places in society where gas is needed, whether it is industrial gas or domestic gas. When the gas flows in the pipeline, in order to ensure that the gas does not flow back to prevent inconvenience in taking or damage to machinery, a check valve will be installed in the gas pipeline. The check valve can provide a single gas flow effect to control the gas from flowing back and effectively prevent any problems that may be caused by gas backflow.

[0003] However, the effect of the existing check valve is not ideal, so it needs to be improved. Summary of the invention

[0004] The utility model provides a check valve, which solves the problem of unsatisfactory check effect in the prior art.

[0005] To realize the above technical solution, the technical solution of the utility model is as follows: a check valve, comprising a body, a sealing member movably accommodated in the body, and an elastic element sleeved on the sealing member; characterized in that at least two truncated cone-shaped sealing surfaces are arranged in an array along the axis direction of the body; the sealing member and the sealing surface are in surface contact and sealing;

[0006] Wherein: when the inner pressure of the body increases, the sealing element is driven to squeeze and deform toward the sealing surface to form a seal.

[0007] Furthermore, the main body is cylindrical; a pressure chamber and a guide chamber that are interconnected are provided on one side of the main body along the axial direction; and the diameter of the pressure chamber is much larger than the diameter of the guide chamber.

[0008] Furthermore, a first sealing surface is provided at the connection between the pressure chamber and the guide chamber; a second sealing surface is provided at the other end of the guide chamber; the diameter of the first sealing surface is much larger than the diameter of the second sealing surface; the inclination angle of the first sealing surface is much larger than the inclination angle of the second sealing surface;

[0009] The other end of the pressure chamber is detachably provided with a filter screen, and the filter screen is formed by stacking mesh sheets with different mesh sizes on at least two sides; the other end of the guide chamber is integrally provided with a second filter screen.

[0010] Furthermore, a primary sealing groove and a secondary sealing groove are provided on the outer side of the main body along the axial direction; sealing rings are sleeved corresponding to the primary sealing groove and the secondary sealing groove; one end of the main body is threaded, or both ends of the main body are threaded; two concave holes (four flat positions for easy disassembly and replacement) are symmetrically provided on the other end of the main body.

[0011] Furthermore, the sealing member comprises a first deformable sealing element, a connecting element and a second deformable sealing element which are coaxially arranged; and the first deformable sealing element, the connecting element and the second deformable sealing element which are adjacent to each other are integrally formed.

[0012] Further, the diameter of the connecting element is smaller than the diameter of the second deformable sealing element; and the diameter of the second deformable sealing element is much smaller than the diameter of the first deformable sealing element.

[0013] Furthermore, one end of the first deformable sealing element / the second deformable sealing element is chamfered at a right angle (inversely inclined surface); the chamfer angle of the first deformable sealing element is much larger than the chamfer angle (inversely inclined surface) of the second deformable sealing element, and they are arranged in the same direction.

[0014] Furthermore, the elastic element is a spring.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1) The airflow of the utility model enters through the air hole at one end of the pressure chamber, and enters the inner side of the pressure chamber after being filtered by the filter screen, so that the pressure inside the pressure chamber gradually increases, and then the seal is pushed to move along the axis direction of the guide chamber, forcing the seal to be squeezed and slightly deformed toward the sealing surface, thereby constructing a double seal and effectively cutting off the air path. When the air pressure inside the pressure chamber decreases, the seal is reset under the action of the spring, so that the seal moves in the opposite direction and the air flow path is reconnected. The whole structure is reasonably designed, and the pressure difference is used in conjunction with the double sealing surface to realize the sealing of the path, effectively preventing the backflow of the air flow;

[0017] 2) When the new type is in normal circulation, the pressure inside the pressure chamber overcomes the elastic force of the spring, pushes the seal forward, and the airflow channel is cut off. During the entire use, the pressure inside the pressure chamber further presses the seal so that when it contacts the sealing surface, deformation is still found on the contact surface, which can effectively increase the sealing effect, the vacuum check effect is obvious, and the instant check effect is excellent. The utility model prevents backflow and is stable and effective to use;

[0018] 3) The utility model is provided with a primary sealing groove and a secondary sealing groove along the axial direction on the outer side of the body, and sealing rings are provided on the corresponding grooves, so that the secondary sealing groove can effectively prevent dust, waste chips, oil and water from entering the entire connection during use; the sealing end face direction of the primary sealing groove and the sealing cylindrical hole direction of the secondary sealing groove make the vacuum cavity less likely to leak, ensure stability and optimal function, and prevent waste chips, oil and water from entering the channel when the cavity is back-blown for cleaning.

[0019] 4) The utility model is provided with a first sealing surface at the connection between the pressure chamber and the guide chamber, wherein the first sealing surface is arranged in a bell-mouth shape, so that the sealing degree is better when the relative guide plane is fitted, because the plane fitting is easy to produce reflected gas, resulting in the slow instantaneous sealing of the T-shaped silicone valve core and the need for a larger vacuum degree of vacuuming. Therefore, the above design can effectively save energy while improving the sealing performance and making the sealing more sensitive in an instantaneous manner;

[0020] 5) The utility model is provided with a first sealing surface and a second sealing surface, wherein the first sealing surface and the second sealing surface are both provided in a trumpet shape, so that the airflow is transferred from the large opening to the small opening, and the instantaneous suction is more obvious, and the first sealing surface and the second sealing surface are sealed at the level of double-channel sealing, the vacuum degree is maintained more stably, and the pressure-maintaining effect is better;

[0021] 6) The utility model adds a screw thread to the main body and then adds a seal on the end face and the side face with the vacuum channel. The sealing performance is stable, effective, durable, easy to seal and easy to disassemble and interchangeable. The two concave holes or flat positions or hexagonal or special-shaped concave square grooves on the top can be easily disassembled and replaced with special tools. The symmetrical hole design on the side is added to facilitate the removal and replacement of the screw thread with tools after it is unscrewed;

[0022] 7) The utility model constructs a double-stage filtration through the filter screen and the second filter screen, which effectively ensures that impurities in the airflow or the outside world can be accurately isolated during forward and reverse operation, effectively ensures that the entire closed cavity is clean, eliminates the effect of non-returnability caused by impurities, increases the airtightness of the work, and makes the airtightness more guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] Figure 1 It is a front view of the check valve of the utility model;

[0025] Figure 2 It is an exploded diagram of the check valve of the utility model;

[0026] Figure 3 This is a three-dimensional structural diagram of the check valve of the utility model;

[0027] Figure 4 It is a schematic diagram of the three-dimensional structure of the thread arrangement at both ends of the check valve of the utility model. DETAILED DESCRIPTION

[0028] 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.

[0029] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Please refer to the attached Figures 1 to 4 As shown: a check valve comprises a body 1, a sealing member 2 movably accommodated in the body 1 and an elastic element 3 sleeved on the sealing member 2; at least two truncated cone-shaped sealing surfaces 11 are arranged in an array along the axial direction of the body 1; the sealing member 2 is in surface contact with the sealing surface 11 for sealing; when the pressure inside the body 1 increases, the sealing member 2 is driven to squeeze and deform toward the sealing surface 11 to form a seal.

[0031] On the basis of the above embodiment, the body 1 is cylindrical; the body 1 is provided with a pressure chamber 12 and a guide chamber 13 which are interconnected along one side of the axial direction; the diameter of the pressure chamber 12 is much larger than the diameter of the guide chamber 13. In the normal circulation of the new type of use, the positive pressure or negative pressure from the pressure difference in the pressure chamber drives the seal and the elastic force of the elastic element spring sleeved on the seal, pushing the seal to move to the lower air outlet, and the air flow channel is cut off. During the whole use, the pressure in the pressure chamber presses the seal to produce a closed vacuum cavity, and the pressure difference continues to increase. After further pressure is applied to seal with the first sealing part of the sealing surface, it contacts with the second sealing part. When in contact, a greater deformation is still found on the contact surface, thereby forming a secondary seal, which increases the sealing effect better and more effectively. The utility model prevents backflow, has obvious vacuum backstop effect, and has excellent instant backstop effect, and is stable and effective in use.

[0032] On the basis of the above-mentioned embodiment, a first sealing surface 111 is provided at the connection between the pressure chamber 12 and the guide chamber 13; a second sealing surface 112 is provided at the other end of the guide chamber 13; the diameter of the first sealing surface 111 is much larger than the diameter of the second sealing surface 112; the inclination angle of the first sealing surface 111 is much larger than the inclination angle of the second sealing surface 112; the utility model provides a first sealing surface at the connection between the pressure chamber and the guide chamber, wherein the first sealing surface is arranged in a trumpet shape, so that it has better sealing when it is relatively fitted with the guide plane, because the plane fitting is prone to produce reflected gas, resulting in slow instantaneous sealing of the T-shaped silicone valve core and the need for a greater vacuum degree, so the above-mentioned design can effectively save energy while improving the sealing performance; in addition, the first sealing surface and the second sealing surface are both arranged in a trumpet shape, so that the airflow turns from the large mouth to the small mouth, and the instantaneous suction is more obvious, the first sealing surface and the second sealing surface level are sealed with double-channel sealing, the vacuum degree is maintained more stable, and the pressure maintaining effect is better

[0033] The other end of the pressure chamber 12 is detachably provided with a filter screen 121, and the filter screen 121 is formed by stacking meshes with different mesh sizes on at least two sides to ensure that the airflow finally entering the inner side of the pressure chamber 12 is clean and free of impurities to ensure the sealing effect; the other end of the guide cavity is integrally provided with a second filter screen 131, which is used to filter the outlet end again to prevent reverse flow of dirt and affect the airtightness.

[0034] On the basis of the above embodiment, a primary sealing groove 14 and a secondary sealing groove 15 are provided on the outer side of the main body 1 along the axial direction; sealing rings are sleeved corresponding to the primary sealing groove 14 and the secondary sealing groove 15; one end of the main body 1 is threaded or both ends of the main body 1 are threaded, and the other end adopts an external hexagon or an internal hexagon or is provided with concave holes in a radial circumferential array. Preferably, both ends of the main body 1 are threaded.

[0035] Based on the above embodiment, the sealing member 2 comprises a first deformable sealing element 21, a connecting element 22 and a second deformable sealing element 23 which are coaxially arranged; the first deformable sealing element 21, the connecting element 22 and the second deformable sealing element 23 adjacent to each other are integrally formed.

[0036] On the basis of the above embodiment, the diameter of the connecting element 22 is smaller than the diameter of the second deformable sealing element 23 ; the diameter of the second deformable sealing element 23 is much smaller than the diameter of the first deformable sealing element 21 .

[0037] Based on the above embodiment, one end of the first deformable sealing element 21 / the second deformable sealing element 23 is chamfered at a right angle; the chamfer angle of the first deformable sealing element 21 is much larger than the chamfer angle of the second deformable sealing element 23, and they are arranged in the same direction.

[0038] Based on the above embodiment, the elastic element 3 is a spring.

[0039] The working principle of the utility model is as follows: the airflow of the utility model enters through the air hole at one end of the pressure chamber 12, and enters the inner side of the pressure chamber 12 after being filtered by the filter screen 121, so that the pressure inside the pressure chamber 12 is gradually increased, thereby pushing the seal 2 to move along the axial direction of the guide chamber 13, forcing the seal 2 to be squeezed and slightly deformed toward the sealing surface 11, constructing a double seal, and effectively cutting off the air path. When the air pressure inside the pressure chamber 12 decreases, the seal 2 is reset under the action of the spring, so that the seal 2 moves in the opposite direction and reconnects the air flow path. The whole structure is reasonably designed, and the pressure difference is combined with the double sealing surface to realize the passage and double filtration to prevent impurities from sealing the seal, effectively preventing the backflow of the airflow and being stable and effective to use. The sealing effect is more obvious and reliable, and can be as high as 0.86Mpa (under the scenario conditions of using a vacuum generator).

[0040] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any person skilled in the art should be able to use the technical content disclosed above to make equivalent embodiments that are equivalent changes by slight changes or modifications without departing from the scope of the technical solution of the present invention. However, any brief modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A check valve, comprising a body (1), a sealing member (2) movably received in the body (1), and an elastic member (3) sleeved on the sealing member (2); characterized in that: At least two truncated cone-shaped sealing surfaces (11) are arranged in an array along the axis direction of the body (1); the sealing element (2) is in surface contact and sealing with the sealing surfaces (11); Wherein: when the pressure inside the body (1) increases, the sealing element (2) is driven to squeeze and deform toward the sealing surface (11) to form a seal.

2. The check valve according to claim 1, characterized in that: The body (1) is cylindrical; one side of the body (1) along the axial direction is provided with a pressure chamber (12) and a guide chamber (13) which are interconnected; the diameter of the pressure chamber (12) is much larger than the diameter of the guide chamber (13).

3. The check valve according to claim 2, characterized in that: A first sealing surface (111) is provided at the connection between the pressure chamber (12) and the guide chamber (13); a second sealing surface (112) is provided at the other end of the guide chamber (13); the diameter of the first sealing surface (111) is much larger than the diameter of the second sealing surface (112); and the inclination angle of the first sealing surface (111) is much larger than the inclination angle of the second sealing surface (112); The other end of the pressure chamber (12) is detachably provided with a filter screen (121); the filter screen (121) is formed by stacking mesh sheets with different mesh sizes on at least two sides; A second filter screen (131) is integrally provided at the other end of the guide cavity (13).

4. The check valve according to claim 2, characterized in that: The outer side of the body (1) is provided with a primary sealing groove (14) and a secondary sealing groove (15) along the axial direction; sealing rings are sleeved on the primary sealing groove (14) and the secondary sealing groove (15); and one end of the body (1) is threaded or both ends are threaded.

5. The check valve according to claim 1, characterized in that: The sealing member (2) comprises a first deformable sealing element (21), a connecting element (22) and a second deformable sealing element (23) which are coaxially arranged; the first deformable sealing element (21), the connecting element (22) and the second deformable sealing element (23) which are adjacent to each other are integrally formed.

6. The check valve according to claim 5, characterized in that: The diameter of the connecting element (22) is smaller than the diameter of the second deformable sealing element (23); and the diameter of the second deformable sealing element (23) is much smaller than the diameter of the first deformable sealing element (21).

7. The check valve according to claim 6, characterized in that: One end of the first deformable sealing element (21) / the second deformable sealing element (23) is chamfered at a right angle; the chamfer angle of the first deformable sealing element (21) is much greater than the chamfer angle of the second deformable sealing element (23), and they are arranged in the same direction, so that the sealing effect is safe and reliable.

8. The check valve according to claim 1, characterized in that: The elastic element (3) is a spring.

9. The check valve according to claim 4, characterized in that: Both ends of the body (1) are threaded.

Images