Silencing check valve

Abstract

The utility model discloses a silencing check valve, and belongs to the technical field of valves. According to the noise elimination check valve, the valve clack, the main valve body and the auxiliary valve body jointly form the sealing piece groove, the sealing piece is arranged in the sealing piece groove, meanwhile, the joint of the valve clack, the main valve body and the auxiliary valve body is sealed, an additional installation structure is not needed, the valve structure is simplified, and production is convenient. The sealing element comprises a framework and a rubber coating layer, the framework is an annular frame, the rubber coating layer is arranged around the framework by a circle, and the rubber coating layer is attached to the framework; the rubber coating layer comprises a protruding part and a base part, and the protruding part protrudes outwards in the two directions perpendicular to the plane of the annular frame on the basis of the base part. The valve sealing element can be firmly fixed, and the rubber coating layer can be prevented from being damaged due to overlarge stress.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and specifically, to a silencing check valve. Background Art

[0002] When designing the structure of some valves, in order to facilitate the installation of internal components (such as valve flaps / cartridges), the valve body usually adopts a split structure, that is, the valve body is connected by a main valve body and a sub-valve body. This structure requires at least one additional sealing structure to be designed at the connection part between the main valve body and the sub-valve body, and a sealing structure also needs to be designed between the valve flap / cartridge and the valve body. This leads to a relatively complex sealing structure on the valve, increasing the production process and raising the production cost.

[0003] For the silencing check valves in the prior art, in order to facilitate the installation of internal parts such as valve flaps, there are generally two structural forms. The first is to adopt an integral valve body structure, with a detachable bracket arranged inside the valve body for installing the valve shaft and the valve flap; the other is to adopt an integral valve body structure, with a detachable valve seat arranged inside the valve body for installing the valve shaft and the valve flap. No matter which one it is, a sealing structure needs to be designed on the valve flap or the valve body or the valve seat, and the sealing structure needs to be fixed separately through a pressing member, resulting in a relatively complex structure of the silencing check valve, increasing the production process and raising the production cost.

[0004] For example, in a patent document of a multi-functional environmental protection check valve with encryption, with the patent publication number of CN205578799U, including a main valve body and a sub-valve body, the sub-valve body is arranged at the outlet end of the main valve body. A valve flap is arranged inside the sub-valve body. One side of the valve flap abuts against the sub-valve body through a spring, and the other side of the valve flap forms a seal with the outlet end of the main valve body. An O-ring is arranged on the end face where the valve flap forms a seal with the main valve body. The spring is always in a certain compressed state. When there is no water flow, the valve flap is always tightly pressed on the main valve body by the elastic force of the spring itself. The valve flap and the main valve body are sealed through the O-ring, and the O-ring and the main valve body adopt line sealing, which is sensitive and reliable and can maintain a sealed closed state under the fluctuation of the medium pressure within a certain range; when the user actively uses water, the pressure difference before and after the valve becomes larger, thus overcoming the elastic force of the spring and pushing the valve flap to move towards the sub-valve body, and then water is passed through; when the user does not use water, the valve flap is tightly pressed on the main valve body again by the elastic force of the spring itself. When the seal of this application is in use, it is easy to fall off, resulting in loose sealing; at the same time, there is no sealing structure between the main valve body and the sub-valve body of this application, and leakage is likely to occur. Summary of the Utility Model

[0005] 1. Technical Problems to be Solved by the Utility Model

[0006] In view of the problem that the seal in the existing valve is not firmly fixed and is prone to falling off after installation, and when the sealing structure is installed in the valve, an additional fixing structure is required, resulting in a relatively complex sealing structure in the valve and difficult production, the present utility model provides a silencing check valve, which can not only firmly install the seal but also does not require an additional fixing structure, simplifies the valve structure, and is easier to produce.

[0007] 2. Technical solution

[0008] To achieve the above object, the technical solution provided by the present utility model is as follows:

[0009] A silencing check valve of the present utility model includes a main valve body and a sub-valve body. The main valve body and the sub-valve body are connected together. Valve cavities are formed in both the main valve body and the sub-valve body. A guide member is movably arranged in the valve cavities of the main valve body and the sub-valve body. A valve flap is arranged on the guide member. The valve flap and the guide member reciprocate in the direction from the main valve body towards the sub-valve body. When the valve flap contacts the sub-valve body, the valve flap, the main valve body and the sub-valve body jointly enclose a seal groove. A seal is arranged in the seal groove to form a seal between the main valve body and the sub-valve body and a seal between the valve flap and the sub-valve body.

[0010] As a further improvement of the present utility model, the seal includes a skeleton and a rubber coating layer. The skeleton is an annular frame. The rubber coating layer is arranged around the skeleton for one week and is in contact with the skeleton. The rubber coating layer includes a protruding part and a base part. The protruding part protrudes outward in two directions perpendicular to the plane of the annular frame based on the base part.

[0011] As a further improvement of the present utility model, the skeleton is divided into an intermediate part and an edge part. One edge part is connected to each side of the intermediate part. The base part is coated on the intermediate part, and the protruding part is coated on the edge part.

[0012] As a further improvement of the present utility model, an upper groove and a lower groove are formed between the protruding parts on both sides of the skeleton. The upper groove and the lower groove are located on two opposite side surfaces of the skeleton.

[0013] As a further improvement of the present utility model, the end face of the valve flap is a valve flap sealing surface, and the end face of the main valve body is a main valve body sealing surface. The valve flap sealing surface and the main valve body sealing surface jointly form one side wall of the seal groove.

[0014] As a further improvement of the present utility model, the end face of the auxiliary valve body is the auxiliary valve body sealing surface, and an auxiliary valve body protrusion is provided on the auxiliary valve body sealing surface and protrudes into the seal groove; a main valve body protrusion is provided on the main valve body sealing surface and protrudes into the seal groove; the main valve body protrusion and the auxiliary valve body protrusion are respectively clamped in the upper groove and the lower groove; the valve flap sealing surface and the main valve body sealing surface are respectively in close contact with a protruding part on the seal.

[0015] As a further improvement of the present utility model, a gap is formed between the valve flap and the main valve body, and the gap is located at the base part of the seal; an auxiliary valve body avoidance groove is formed on the auxiliary valve body protrusion, and the auxiliary valve body avoidance groove is located at the base part of the seal; the gap and the auxiliary valve body avoidance groove are respectively located on two side surfaces of the seal.

[0016] As a further improvement of the present utility model, the valve flap is arranged in the main valve body, and the guiding member includes a first guide rod and a second guide rod which are respectively arranged on two side surfaces of the valve flap.

[0017] As a further improvement of the present utility model, a spring is arranged on the outer periphery of the second guide rod, one end of the spring abuts against the valve flap, and the other end abuts against the second spring seat, and the second spring seat is arranged in the valve cavity of the main valve body.

[0018] As a further improvement of the present utility model, one end of the first guide rod is connected to the valve flap, and the other end is movably arranged in the first guide sleeve, and the first guide sleeve is arranged in the valve cavity of the auxiliary valve body; one end of the second guide rod is connected to the valve flap, and the other end is movably arranged in the second guide sleeve, and the second guide sleeve is arranged in the valve cavity of the main valve body.

[0019] 3. Beneficial effects

[0020] Adopting the technical solution provided by the present utility model, compared with the existing well-known technology, the following remarkable effects are achieved:

[0021] (1) For a noise elimination check valve provided by the present utility model, a seal groove is formed by the valve flap, the main valve body and the auxiliary valve body, and the seal is arranged in the seal groove. Without setting additional installation structures, the seal can be installed in place.

[0022] (2) For a noise elimination check valve provided by the present utility model, the valve flap sealing surface and the main valve body sealing surface jointly form one side wall of the seal groove, so that one seal not only seals the connection gap between the main valve body and the auxiliary valve body, but also seals the gap between the valve flap and the auxiliary valve body. At the same time, the gap between the valve flap and the main valve body is also sealed. Multiple seals can be completed without setting multiple seals, which simplifies the valve structure.

[0023] (3)The silencing check valve provided by the present utility model has protrusions provided on both the main valve body and the auxiliary valve body, which are snapped into the upper and lower grooves of the sealing member, fixing the sealing member in two directions to prevent the sealing member from moving.

[0024] (4)The silencing check valve provided by the present utility model has an avoidance groove provided on the protrusion of the auxiliary valve body, and a gap is left between the valve flap and the main valve body. When the sealing member is squeezed and the base portion deforms, it can deform towards the avoidance groove and the gap, thereby preventing the rubber coating layer from being damaged by pressure.

[0025] (5)The sealing member designed in the silencing check valve provided by the present utility model includes a skeleton and a rubber coating layer. The skeleton is a metal structure, providing sufficient supporting force for the sealing member. The rubber coating layer wraps around the outer periphery of the skeleton. When the sealing member is installed and pressed, the rubber coating layer fills the gaps to achieve sealing. The rubber coating layer extends in two directions perpendicular to the plane, that is, protruding portions extend upwards and downwards respectively. The base portion is located in the middle of the skeleton, and the protruding portions are located at the two edges of the skeleton, thereby realizing a structure where the middle of the rubber coating layer is thin and the two edges are thick. When the protruding portions are squeezed, the sealing member is pressed and positioned from both side surfaces of the base portion. Since the thickness of the base portion is thin, it is not easily deformed by pressure and damaged. The main pressure-bearing and positioning function is mainly played by the skeleton structure, and the base portion mainly only plays the role of connecting the two protruding portions on both sides. In this way, both the structural stability can be ensured so that the sealing member is not easily detached, and the sealing effect can be achieved. In addition, the thickness of the protruding portion is larger than that of the base portion, and it is positioned in the installation groove and can be deformed by pressure to form a seal, with a good sealing effect. The protruding portions extend in two directions, upwards and downwards, thereby forming two grooves. After the sealing member is installed, the sealing member can be clamped from two directions to prevent it from moving, thereby better sealing the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the top view of the sealing member of the present utility model;

[0027] Figure 2 is for Example 1 Figure 1 the cross-sectional view of the A-A plane in;

[0028] Figure 3 is Figure 2 the enlarged view of the structure at B in;

[0029] Figure 4 is for Example 2 Figure 1 the cross-sectional view of the A-A plane in;

[0030] Figure 5 is Figure 4 the enlarged view of the structure at C in;

[0031] Figure 6 is the half-sectional view of the silencing check valve of the present utility model;

[0032] Figure 7 for Figure 6 An enlarged view of the structure at point D after removing the seal.

[0033] Description of the numbers in the schematic diagram:

[0034] 1. Sealing member; 11. Rubber coating; 111. Protrusion; 112. Base; 113. Upper groove; 114. Lower groove; 12. Frame; 121. Edge; 122. Middle; 2. Valve flap; 21. Valve flap body; 22. Valve flap sealing surface; 3. Main valve body; 31. Main valve body body; 32. Main valve body sealing surface; 33. Main valve body protrusion; 4. Auxiliary valve body; 41. Auxiliary valve body body; 42. Auxiliary valve body sealing surface; 43. Auxiliary valve body protrusion; 44. Auxiliary valve body avoidance groove; 5. Gap; 6. Sealing member groove; 71. First guide rod; 72. First spring seat; 73. Spring; 74. First guide sleeve; 75. Second guide sleeve; 76. Second guide rod; 77. Second spring seat. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication between two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0040] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0041] Embodiment 1

[0042] Combined with Figure 6, A silencing check valve according to this embodiment includes a main valve body 3 and a sub-valve body 4. The main valve body 3 and the sub-valve body 4 are connected together by bolts. Valve cavities are formed inside both the main valve body 3 and the sub-valve body 4. A valve flap 2 is movably arranged inside the main valve body 3. A first guide rod 71 and a second guide rod 76 are respectively arranged on both sides of the valve flap 2. The first guide rod 71 and the second guide rod 76 are located on the same axis. When the valve flap 2 contacts the sub-valve body 4, the valve flap 2, the main valve body 3 and the sub-valve body 4 jointly enclose a seal groove 6, and a seal 1 is arranged in the seal groove 6. In this embodiment, a spring 73 is arranged on the outer circumference of the second guide rod 76. One end of the spring 73 abuts against the valve flap 2, and the other end abuts against a second spring seat 77. The second spring seat 77 is arranged in the valve cavity of the main valve body 3. A first spring seat 72 is arranged on the valve flap 2. The diameter of the first spring seat 72 is larger than that of the second guide rod 76, and the diameter of the second spring seat 77 is also larger than that of the second guide rod 76. The spring 73 is sleeved on the first spring seat 72 and the second spring seat 77.

[0043] In this embodiment, one end of the first guide rod 71 is connected to the valve flap 2, and the other end is movably arranged in a first guide sleeve 74. The first guide sleeve 74 is arranged in the valve cavity of the sub-valve body 4. One end of the second guide rod 76 is connected to the valve flap 2, and the other end is movably arranged in a second guide sleeve 75. The second guide sleeve 75 is arranged in the valve cavity of the main valve body 3. The first guide rod 71, the second guide rod 76 cooperate with the first guide sleeve 74 and the second guide sleeve 75 to guide the movement of the valve flap 2, so that it moves in a straight line.

[0044] Combined Figure 1 and Figure 2 , The seal 1 in this embodiment includes a skeleton 12 and a rubber coating layer 11. The skeleton 12 is an annular frame. The rubber coating layer 11 is arranged around the skeleton 12 for one week, and the rubber coating layer 11 is in contact with the skeleton 12, that is, the rubber coating layer 11 wraps around the outer circumference of the skeleton 12. The skeleton 12 is a metal structure, providing sufficient support force for the seal 1. The outer circumference of the skeleton 12 is wrapped with the rubber coating layer 11. When the seal 1 is installed and pressed, the rubber coating layer 11 fills the gap, thereby realizing sealing. In order to adapt to the structures of different valves, the skeleton 12 can be of various shapes, such as closed structures like circular rings and square rings. In view of the fact that the opening of the valve where the seal 1 of this embodiment is installed is circular, the skeleton 12 in this embodiment is a circular ring, that is, the seal 1 is a circular ring. Among them, the skeleton 12 is made of metal material, and the selectable materials include but are not limited to materials such as stainless steel, carbon steel, copper, and aluminum. In this embodiment, the cross-section of the skeleton 12 is a square structure. When it is placed in the Figure 2 way, the lengths of its upper and lower sides are longer than those of its left and right sides.

[0045] Combined Figure 3, in this embodiment, the rubber coating layer 11 for sealing includes a protruding portion 111 and a base portion 112. The protruding portion 111 protrudes outward in two directions perpendicular to the plane of the annular frame based on the base portion 112, that is, it protrudes upward and downward respectively in Figure 3 . In this embodiment, in Figure 3 , the skeleton 12 is divided into an intermediate portion 122 and an edge portion 121 by a dotted line. An edge portion 121 is connected to each side of the intermediate portion 122. Among them, the base portion 112 of the rubber coating layer 11 is coated on the intermediate portion 122, and the protruding portion 111 is coated on the edge portion 121, that is, a protruding portion 111 is provided on each side of the base portion 112 of the rubber coating layer 11. In this embodiment, the lengths of the base portion 112 and the protruding portion 111 are basically equal. According to the structures of different valves, it can also be set to a structure where the protruding portion 111 is longer and the base portion 112 is shorter, or the protruding portion 111 is shorter and the base portion 112 is longer.

[0046] In this embodiment, an upper groove 113 and a lower groove 114 are formed between the protruding portions 111 at both edges of the skeleton 12. The upper groove 113 and the lower groove 114 are located on two opposite sides of the skeleton 12. Among them, the cross-section of the protruding portion 111 is circular, and an arc transition surface is provided between the protruding portion 111 and the base portion 112. For the seal 1 of this embodiment, the rubber coating layer 11 extends in two directions perpendicular to the plane, that is, the protruding portions 111 extend upward and downward respectively. The base portion 112 is located in the middle of the skeleton 12, and the protruding portions 111 are located at both edges of the skeleton 12. Thus, a structure with a thin middle and thick edges of the rubber coating layer 11 is achieved. When the protruding portion 111 is squeezed, the protruding portion 111 can deform towards the base portion 112, thereby preventing the rubber coating layer 11 from being crushed. When the seal 1 is applied, the seal 1 is pressed and positioned from both side surfaces of the base portion 112. Since the thickness of the base portion 112 is thin, it is not easily deformed under pressure and damaged. The structure of the skeleton 12 mainly plays a role in bearing and positioning. The base portion 112 mainly only plays a role in connecting the two protruding portions 111 on both sides. In this way, both the structural stability can be ensured so that the seal 1 is not easily detached, and the sealing effect can be achieved. In addition, the thickness of the protruding portion 111 is larger than that of the base portion 112. It is positioned in the installation groove and can be deformed under pressure to form a seal, with a good sealing effect. The protruding portion 111 extends upward and downward, thereby forming two grooves. After the seal is installed, the seal 1 can be clamped from two directions, preventing it from displacing, and thus better sealing the valve.

[0047] In this embodiment, the valve flap 2 includes a valve flap body 21, and the end of the valve flap body 21 is a valve flap sealing surface 22. The main valve body 3 includes a main valve body main body 31, and the end of the main valve body main body 31 is a main valve body sealing surface 32. The valve flap sealing surface 22 and the main valve body sealing surface 32 together form one side wall of the seal groove 6, which is the upper side wall in this embodiment. The valve flap sealing surface 22 and the main valve body sealing surface 32 are respectively in close contact with one protruding portion 111 on the seal 1. In this embodiment, the valve flap sealing surface 22 and the main valve body sealing surface 32 together form one side wall of the seal groove 6, thereby enabling one seal 1 to seal both the connection gap between the main valve body 3 and the sub-valve body 4 and the gap between the valve flap 2 and the sub-valve body 4. At the same time, it also seals the gap between the valve flap 2 and the main valve body 3, achieving multiple seals without setting multiple seals, thus simplifying the valve structure.

[0048] In this embodiment, the sub-valve body 4 includes a sub-valve body main body 41, and the end face of the sub-valve body main body 41 is a sub-valve body sealing surface 42. In this embodiment, grooves are formed on the sub-valve body sealing surface 42 to form the other three side walls of the seal groove 6. When the seal 1 is installed in the groove, the top extends out of the groove, and the upper side wall formed by the valve flap sealing surface 22 and the main valve body sealing surface 32 presses the seal 1 into the groove, and the seal 1 undergoes a slight deformation to achieve sealing. In this embodiment, a sub-valve body protrusion 43 protrudes into the seal groove 6 on the sub-valve body sealing surface 42; a main valve body protrusion 33 protrudes into the seal groove 6 on the main valve body sealing surface 32; the main valve body protrusion 33 and the sub-valve body protrusion 43 are respectively clamped in the upper groove 113 and the lower groove 114. In this embodiment, protrusions are provided on both the main valve body 3 and the sub-valve body 4, which are clamped into the upper and lower grooves of the seal 1 to fix the seal 1 in two directions and prevent the seal 1 from moving.

[0049] In this embodiment, a gap 5 is formed between the valve flap 2 and the main valve body 3, and the gap 5 is located at the position of the base portion 112 of the seal 1; a sub-valve body avoidance groove 44 is formed on the sub-valve body protrusion 43, and the sub-valve body avoidance groove 44 is located at the position of the base portion 112 of the seal 1; the gap 5 and the sub-valve body avoidance groove 44 are respectively located on both side surfaces of the seal 1. An avoidance groove is formed on the protrusion on the sub-valve body 4, and a gap 5 is left between the valve flap 2 and the main valve body 3. When the seal 1 is squeezed and the base portion 112 deforms, it can deform towards the avoidance groove and the gap 5, thereby preventing the rubber coating layer 11 from being damaged.

[0050] Embodiment 2

[0051] Combined with Figure 4 and Figure 5 , the structure of the seal 1 in this embodiment is basically the same as that in the embodiment, except that the cross-section of the protruding portion 111 is square, and the protruding portion 111 and the base portion 112 form a stepped structure.

[0052] The above has schematically described the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the creation of the present utility model, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.

Claims

1. A silencing check valve, characterized in that, It includes a main valve body (3) and a sub-valve body (4). The main valve body (3) and the sub-valve body (4) are connected together. Valve cavities are formed in both the main valve body (3) and the sub-valve body (4). A guiding member is movably arranged in the valve cavities of the main valve body (3) and the sub-valve body (4). A valve flap (2) is arranged on the guiding member. The valve flap (2) and the guiding member reciprocate in the direction from the main valve body (3) towards the sub-valve body (4). When the valve flap (2) contacts the sub-valve body (4), the valve flap (2), the main valve body (3) and the sub-valve body (4) jointly enclose a seal groove (6). A seal (1) is arranged in the seal groove (6) to form seals between the main valve body (3) and the sub-valve body (4) and between the valve flap (2) and the sub-valve body (4).

2. The silencing check valve according to claim 1, characterized in that, The seal (1) includes a skeleton (12) and a rubber coating layer (11). The skeleton (12) is an annular frame. The rubber coating layer (11) is arranged around the skeleton (12) for one week and is in contact with the skeleton (12). The rubber coating layer (11) includes a protruding part (111) and a base part (112). The protruding part (111) protrudes outward in two directions perpendicular to the plane of the annular frame with the base part (112) as the base.

3. The silencing check valve according to claim 2, characterized in that, The skeleton (12) is divided into an intermediate part (122) and an edge part (121). One edge part (121) is connected to each side of the intermediate part (122). The base part (112) covers the intermediate part (122), and the protruding part (111) covers the edge part (121).

4. The silencing check valve according to claim 3, characterized in that, An upper groove (113) and a lower groove (114) are formed between the protruding parts (111) on both sides of the skeleton (12). The upper groove (113) and the lower groove (114) are located on two opposite side surfaces of the skeleton (12).

5. The silencing check valve according to claim 4, characterized in that, The end face of the valve flap (2) is a valve flap sealing surface (22), and the end face of the main valve body (3) is a main valve body sealing surface (32). The valve flap sealing surface (22) and the main valve body sealing surface (32) jointly form one side wall of the seal groove (6).

6. The silencing check valve according to claim 5, characterized in that, The end face of the sub-valve body (4) is a sub-valve body sealing surface (42). A sub-valve body protrusion (43) protrudes into the seal groove (6) from the sub-valve body sealing surface (42). A main valve body protrusion (33) protrudes into the seal groove (6) from the main valve body sealing surface (32). The main valve body protrusion (33) and the sub-valve body protrusion (43) are respectively clamped in the upper groove (113) and the lower groove (114). The valve flap sealing surface (22) and the main valve body sealing surface (32) are respectively in close contact with a protruding part (111) on the seal (1).

7. The silencing check valve according to claim 6, characterized in that, A gap (5) is formed between the valve flap (2) and the main valve body (3), and the gap (5) is located at the base portion (112) of the seal (1); a sub-valve body relief groove (44) is formed in the protrusion (43) of the sub-valve body, and the sub-valve body relief groove (44) is located at the base portion (112) of the seal (1); the gap (5) and the sub-valve body relief groove (44) are respectively located on both sides of the seal (1).

8. A silencing check valve according to any one of claims 1-7, characterized in that, The valve flap (2) is arranged in the main valve body (3), and the guiding members include a first guide rod (71) and a second guide rod (76) which are respectively arranged on both side surfaces of the valve flap (2).

9. The silencing check valve according to claim 8, characterized in that, A spring (73) is arranged on the outer periphery of the second guide rod (76). One end of the spring (73) abuts against the valve flap (2), and the other end abuts against the second spring seat (77). The second spring seat (77) is arranged in the valve cavity of the main valve body (3).

10. A silencing check valve according to claim 8, characterized in that, One end of the first guide rod (71) is connected to the valve flap (2), and the other end is movably arranged in the first guide sleeve (74). The first guide sleeve (74) is arranged in the valve cavity of the sub-valve body (4); one end of the second guide rod (76) is connected to the valve flap (2), and the other end is movably arranged in the second guide sleeve (75). The second guide sleeve (75) is arranged in the valve cavity of the main valve body (3).

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