Valve plate and check valve

Abstract

The invention discloses a valve plate and a check valve. The valve plate comprises a sealing face and a sealing body located on the sealing face. The sealing body comprises an inner side part positioned on the sealing surface, an outer side part lapped on the sealing surface, a deformation part positioned between the inner side part and the outer side part, and a deformation space formed between the sealing surface and the deformation part and used for deformation of the deformation part. Compared with the prior art, the sealing performance, the sealing reliability and the stability of the valve plate and the check valve are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, in particular to a valve plate and a check valve. Background Art

[0002] The check valve used in building ventilation systems is mainly used to prevent the airflow in the public exhaust duct from flowing back into the room. Chinese patent document CN201720269639.9 discloses an oil smoke fire check valve with a magnetic seal, which includes a shell and a damper plate rotatably connected to the shell. The shell has a sealing seat. The damper plate fits the sealing seat under the action of its own weight. The sealing seat and the damper plate are sealed by a sealing ring located on the sealing seat. In practice, due to oil adhesion, mechanical wear or aging, a gap is generated between the sealing seat and the damper plate, and the sealing ring cannot play an effective sealing role. In order to improve the sealing performance, a plurality of magnets are arranged on the inner side of the sealing seat to enhance the closing tightness of the damper plate. However, the installation of the magnets requires strict symmetrical alignment and high installation precision. In addition, the magnets are prone to demagnetization and are easily disturbed by oil adhesion. The performance is poor and the cost and maintenance threshold are high.

[0003] In view of this, the applicant in this case conducted in-depth research on the above-mentioned issues and proposed a valve plate and a check valve, which resulted in this case. Summary of the Invention

[0004] The object of the present invention is to provide a valve plate and a check valve, which adopt an innovative sealing structure to bring about an outstanding sealing effect.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A valve plate includes a sealing surface and a sealing body located on the sealing surface; the sealing body includes an inner portion positioned on the sealing surface, an outer portion resting on the sealing surface, a deformation portion located between the inner portion and the outer portion, and a deformation space formed between the sealing surface and the deformation portion for the deformation portion to deform.

[0007] The thickness of the deformation portion in a direction perpendicular to the sealing surface is smaller than the thickness of the outer portion in a direction parallel to the sealing surface.

[0008] The thickness of the deformation portion in a direction perpendicular to the sealing surface is 0.1-0.9 mm; the thickness of the outer portion in a direction parallel to the sealing surface is 0.5-3 mm.

[0009] The width of the deformation space in a direction parallel to the sealing surface is at least twice the height of the deformation space in a direction perpendicular to the sealing surface.

[0010] The width of the deformation space in a direction parallel to the sealing surface is 5-15 mm, and the height of the deformation space in a direction perpendicular to the sealing surface is 2-6 mm.

[0011] The sealing surface is a plane; the sealing surface is a D-shaped sealing surface, and the sealing body is correspondingly a D-shaped silicone sealing ring.

[0012] The valve plate includes a first plate body that forms the sealing surface and a second plate body that clamps and positions the inner part on the first plate body; the inner part and the first plate body are structures that match each other in a planar manner, and the inner part and the second plate body are structures that match each other in a bending surface manner; the outer sides of the corresponding bending surfaces between the inner part and the second plate body are also smoothly connected with a planar matching structure.

[0013] The structure of the bent surface matching is a structure of arcuate convex surface matching, and the arcuate convex surface matching includes a first sealing inclined surface, a second sealing inclined surface, and an arcuate transition surface smoothly connecting the first sealing inclined surface and the second sealing inclined surface.

[0014] The minimum thickness of the inner portion is greater than the thickness of the deformation portion and the thickness of the outer portion; a transition portion is provided between the inner portion and the deformation portion, and the thickness of the transition portion is greater than the thickness of the deformation portion and the thickness of the outer portion.

[0015] A check valve comprises a valve body, two valve holes arranged obliquely and symmetrically in the valve body, and two groups of valve plates arranged symmetrically and used to open and close the two valve holes; the valve holes are formed with convex edges arranged to press against the deformed parts for sealing.

[0016] By adopting the above solution, the present invention provides a valve disc and check valve. The disc primarily forms a contact seal with the valve body through its deformable portion. The deformable portion remains free, and the corresponding deformation space is a preset extrusion deformation amount. Thus, the deformable portion elastically deforms after being squeezed, automatically compensating for microscopic irregularities in the contact surface during deformation, achieving an adaptive and tight fit. Compared with existing technologies, this significantly improves sealing performance, reliability, and stability.

[0017] Furthermore, the thickness of the deformation part in the direction perpendicular to the sealing surface is smaller than the thickness of the outer part in the direction parallel to the sealing surface. The deformation part and the outer part are functionally divided by a thickness gradient. The relatively thin design of the deformation part undertakes the main sealing function, enhances the flexible deformation and elastic sealing effect, and the relatively thick design of the outer part provides rigid support, constrains the deformation part like a wall, and ensures continuous and effective sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the valve plate of the present invention;

[0019] Figure 2 is a cross-sectional view of the valve plate of the present invention;

[0020] Figure 3 yes Figure 2 Middle local enlargement Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the state of the valve plate of the present invention in application;

[0022] Figure 5 yes Figure 2 Middle local enlargement Figure 2 ;

[0023] Figure 6 The structural decomposition of the valve plate of the present invention Figure 1 ;

[0024] Figure 7 It is a three-dimensional schematic diagram of the check valve of the present invention;

[0025] Figure 8 It is a structural exploded view of the check valve of the present invention.

[0026] Label Description

[0027] Valve plate 100, sealing surface 1, first plate body 101, second plate body 102, rotating shaft 103, rivet hole 104, rivet hole 105; sealing body 2, inner part 21, outer part 22, deformation part 23, deformation space 24, transition part 25; plane-matching structure 4, bending surface-matching structure 5, first matching bevel 51, second matching bevel 52, arc-shaped transition surface 53, plane-matching structure 6; valve body 200, valve hole 201, rim 202. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0029] This case involves a valve plate 100, such as Figure 1-3 As shown, it includes a sealing surface 1 and a sealing body 2 located on the sealing surface 1. The sealing body 2 includes an inner portion 21 positioned on the sealing surface 1, an outer portion 22 resting on the sealing surface 1, a deformable portion 23 located between the inner portion 21 and the outer portion 22, and a deformation space 24 formed between the sealing surface 1 and the deformable portion 23 for the deformable portion 23 to deform.

[0030] The valve plate 100 is applied to a check valve, such as Figure 7-8 As shown, the check valve has a valve body 200 with a valve hole 201 formed therein. The valve plate 100 is installed in the valve body 200 to open and close the valve hole 201 . The valve hole 201 is formed with a rim 202 protruding to press against the deformed portion 23 for sealing.

[0031] When the valve plate closes the valve hole 201, Figure 4 As shown, the deformation portion 23 forms a contact seal with the edge 202, and the deformation portion 23 remains relatively free in cooperation with the outer portion 22 and the deformation space 24, forming a dynamic sealing interface, wherein the deformation space 24 is the preset extrusion deformation of the deformation portion 23. Figure 4 As shown, the deformable portion 23 elastically deforms after being squeezed, closely fitting the surface of the mating edge 202. The deformable portion 23 forms a tortuous, multi-channel sealing ring. Furthermore, during deformation, it automatically compensates for microscopic irregularities in the contact surface, achieving an adaptive, tight fit. Compared with existing technologies, this significantly reduces the risk of leakage and greatly improves the sealing performance, reliability, and stability of the valve disc.

[0032] The outer portion 22 plays an essential role in supporting the sealing performance of the deformation portion 23. Figure 5 As shown, the thickness T1 of the deformation portion 23 in the direction perpendicular to the sealing surface 1 is less than the thickness T2 of the outer portion 22 in the direction parallel to the sealing surface 1. The deformation portion 23 and the outer portion 22 are functionally divided by a thickness gradient. The deformation portion 23 is designed with a relatively thin wall and low rigidity. It can undergo significant elastic deformation under a relatively small external pressure. Moreover, the relatively thin deformation portion has a stronger ability to fit microscopic unevenness, reducing interface leakage channels. The outer portion 22 is designed with a relatively thick wall to provide appropriate rigid support to prevent overall crushing, and the thick outer portion 22 constrains the deformation portion 23 like a wall to ensure continuous and effective sealing. Through the differentiated thickness design, the sealing body 2 achieves the synergistic optimization of sealing performance and structural strength, greatly improving the overall sealing effect.

[0033] Furthermore, the thickness T1 of the deformable portion 23 in a direction perpendicular to the sealing surface 1 is 0.1-0.9 mm. The thickness of the outer portion 22 in a direction parallel to the sealing surface 1 is 0.5-3 mm. In a specific preferred embodiment, the thickness T1 of the deformable portion 23 is 0.5 mm, and the thickness of the outer portion 22 is 1 mm.

[0034] The deformation part 23 is relatively free to stretch in the deformation space 24, which can avoid the deformation part 23 from being hardened or permanently deformed due to excessive compression. After long-term use, the deformation part 23 can still recover its original shape, thereby extending the sealing life. Figure 5 As shown, the width D of the deformation space 24 in the direction parallel to the sealing surface 1 is at least twice the height H of the deformation space 24 in the direction perpendicular to the sealing surface 1. This design of the deformation space 24 can ensure uniform distribution of contact pressure and avoid insufficient or excessive local pressure.

[0035] Furthermore, the width D of the deformation space 24 in a direction parallel to the sealing surface 1 is 5-15 mm, and the height H of the deformation space 24 in a direction perpendicular to the sealing surface 1 is 2-6 mm. In a specific preferred embodiment, the width D of the deformation space 24 is 10 mm, and the height H is 4 mm.

[0036] like Figure 3 As shown, the sealing surface 1 of the valve plate is a plane, ensuring effective adaptive sealing with the deformed portion 23 deformed after being squeezed.

[0037] The valve disc's sealing surface 1 is D-shaped, and the sealing body 2 is a corresponding D-shaped silicone seal ring. Consequently, the inner portion 21, outer portion 22, deformable portion 23, and deformable space 24 form a D-shaped closed-loop structure, achieving a complete closed-loop sealing effect. In practical applications, the valve disc is symmetrically arranged in two groups to form a double-opening valve disc, corresponding to the valve body 200 having two groups of D-shaped valve holes 201, achieving an overall effective sealing effect for both groups of D-shaped valve holes.

[0038] like Figure 1-2 、 Figure 5 As shown, the valve disc 100 includes a first plate 101 forming the sealing surface 1 and a second plate 102 that clamps and positions the inner portion 21 on the first plate 101. The inner portion 21 and the first plate 101 form a structure 4 for planar mating, with the mating surfaces between the inner portion 21 and the first plate 1 being flat. The inner portion 21 and the second plate 102 form a structure 5 for matching curved surfaces, with the mating surfaces between the inner portion 21 and the second plate 102 being matching curved planes. Thus, the clamping and mating of the inner portion 21 with the first and second plates 101, 102, utilizes a combination of flat and curved surfaces.

[0039] The combination of a flat surface and a curved surface—a flat surface on one side of the inner portion 21 and a curved surface on the other—concentrates the pressing force through the single-sided curved structure, allowing for uniform contact on the flat side to compensate for tolerances on the curved side. Compared to structures with double-sided curved surfaces, this reduces the risk of localized sealing failure caused by misalignment, provides more uniform contact pressure, and achieves superior overall interface sealing performance. Furthermore, the single-sided curved structure concentrates elastic deformation on a single side, optimizing stress distribution, avoiding fatigue failure, and extending the seal's service life.

[0040] The combination of a flat surface and a bent surface has no complex structure on the flat surface side, and the flatness requirement for the panel surface is low. The overall stability is not easily affected by dislocation during assembly. Compared with the structure with double-sided bent surfaces, it has strong anti-dislocation ability and assembly adaptability, and the structure is more stable.

[0041] The combination of the plane and the bent surface only requires processing the bent surface structure on one side, which reduces the cost of plate forming and also reduces the requirements for the processing accuracy of the two plates, reducing the risk of structural misfit due to processing errors.

[0042] like Figure 3 As shown, the bent surface mating structure 5 is a structure in which an arcuate raised surface is mated. The arcuate raised surface mating structure includes a first mating bevel 51, a second mating bevel 52, and a curved transition surface 53 that smoothly connects the first and second mating bevels 51 and 52. That is, the inner portion 21 is formed with a first sealing bevel, a second sealing bevel, and a curved surface that smoothly connects the first and second sealing bevels. The second plate 102 is correspondingly formed with a matching first sealing bevel, second sealing bevel, and curved surface. The first sealing bevel of the inner portion 21 and the first sealing bevel of the second plate 102 cooperate to form the first mating bevel 51. Similarly, the second sealing bevel of the inner portion 21 and the second sealing bevel of the second plate 102 cooperate to form the second mating bevel 52. The curved surface of the inner portion 21 and the curved surface of the second plate 102 cooperate to form the curved transition surface 53. This smooth connection structure can evenly distribute contact pressure, improve the sealing interface fit, and reduce stress concentration.

[0043] Further Figure 3 As shown, the outer side of the structure 5 for mating with the corresponding bent surface between the inner portion 21 and the second plate body 102 is also smoothly connected to the structure 6 for mating with the planar surface. In this way, the inner portion 21 has two opposing clamping surfaces, one of which forms a continuous sealing band with four different structural forms between the clamping surface and the second plate body 102, namely the first mating inclined surface 51, the arc-shaped transition surface 53, the second mating inclined surface 52, and the structure 6 for mating with the planar surface. The other clamping surface of the inner portion 21 and the first plate body 101 adopt the structure 4 for mating with the planar surface. This structural combination well balances the comprehensive effects of simple assembly, stable structure, balanced and excellent interface sealing performance, and long-lasting sealing life.

[0044] like Figure 3 As shown, the minimum thickness of the inner portion 21 is greater than the thickness T1 of the deformable portion 23. The minimum thickness of the inner portion 21 is also greater than the thickness T2 of the outer portion 22. The relatively thick inner portion 21 thus more evenly distributes the clamping force, ensuring the overall structural stability of the seal and preventing localized stress concentration that could lead to seal failure. It also provides stronger support for the deformable portion 23, preventing distortion that could cause seal failure.

[0045] like Figure 3 、 Figure 5As shown, a transition portion 25 is provided between the inner portion 21 and the deformable portion 23. The thickness T3 of the transition portion 25 is greater than the thickness T1 of the deformable portion 23. The thickness T3 of the transition portion 25 is also greater than the thickness T2 of the outer portion 22. The transition portion 25 serves as a stress buffer between the inner portion 21 and the deformable portion 23. Its relatively thick design allows for smooth stress transition, preventing shear stress from being generated by the deformable portion 23 and extending the seal life.

[0046] like Figure 1-2 、 Figure 5 As shown, the sealing body 2 is a D-shaped silicone sealing ring, and the first plate body 101 and the second plate body 102 are both D-shaped plates.

[0047] like Figure 1-2 As shown, the two ends of the first plate 101 corresponding to the straight side are respectively integrally formed with rotating shafts 103 protruding outward. The valve disc of the check valve is movably mounted on the check valve through the rotating shafts 103 at both ends, and realizes the function of opening and closing the valve hole 201.

[0048] like Figure 1 、 Figure 6 As shown, the first plate 101 is provided with a plurality of groups of rivet holes 104, and the second plate 102 is provided with a plurality of groups of rivet holes 105. The rivet holes 104 and the rivet holes 510 are riveted to each other in alignment, thereby achieving the integral fixation of the first plate 101 and the second plate 102 and tightly clamping and fixing the sealing body 2. In a specific embodiment, the first plate 101 and the second plate 102 are D-shaped plates, and three groups of corresponding rivet holes 104 and rivet holes 105 are provided in a triangular distribution, respectively located on the first plate 101 and the second plate 102 at positions corresponding to the ends of the straight edges and the center of the arc edges. This distribution design achieves the most stable and balanced clamping and fixing of the sealing body 2 with the simplest rivet points.

[0049] The present invention also relates to a check valve, such as Figure 1-8 As shown, the check valve comprises a valve body 200, two valve holes 201 arranged obliquely and symmetrically within the valve body 200, and two sets of symmetrically arranged valve discs for opening and closing the two valve holes 201. These valve discs are the valve disc 100 described above. The valve holes 201 are formed with a protruding rim 202 that abuts against the deformable portion 23 for sealing. The check valve employing the valve disc 100 described above exhibits the aforementioned advantages of outstanding sealing performance, a stable and reliable structure, and a long-lasting seal.

[0050] The above descriptions are only preferred embodiments of the present invention. Any equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A valve plate, characterized in that: It includes a sealing surface and a sealing body located on the sealing surface; the sealing body includes an inner part positioned on the sealing surface, an outer part resting on the sealing surface, a deformation part located between the inner part and the outer part, and a deformation space formed between the sealing surface and the deformation part for the deformation part to deform.

2. A valve plate according to claim 1, characterized in that: The thickness of the deformation portion in a direction perpendicular to the sealing surface is smaller than the thickness of the outer portion in a direction parallel to the sealing surface.

3. A valve plate according to claim 2, characterized in that: The thickness of the deformation portion in a direction perpendicular to the sealing surface is 0.1-0.9 mm; the thickness of the outer portion in a direction parallel to the sealing surface is 0.5-3 mm.

4. A valve plate according to claim 1, characterized in that: The width of the deformation space in a direction parallel to the sealing surface is at least twice the height of the deformation space in a direction perpendicular to the sealing surface.

5. A valve plate according to claim 4, characterized in that: The width of the deformation space in a direction parallel to the sealing surface is 5-15 mm, and the height of the deformation space in a direction perpendicular to the sealing surface is 2-6 mm.

6. The valve plate according to claim 1, characterized in that: The sealing surface is a plane; the sealing surface is a D-shaped sealing surface, and the sealing body is correspondingly a D-shaped silicone sealing ring.

7. The valve plate according to claim 1, characterized in that: The valve plate includes a first plate body that forms the sealing surface and a second plate body that clamps and positions the inner part on the first plate body; the inner part and the first plate body are structures that match each other in a planar manner, and the inner part and the second plate body are structures that match each other in a bending surface manner; the outer sides of the corresponding bending surfaces between the inner part and the second plate body are also smoothly connected with a planar matching structure.

8. A valve plate according to claim 7, characterized in that: The structure of the bent surface matching is a structure of arcuate convex surface matching, and the arcuate convex surface matching includes a first sealing inclined surface, a second sealing inclined surface, and an arcuate transition surface smoothly connecting the first sealing inclined surface and the second sealing inclined surface.

9. The valve plate according to claim 1, characterized in that: The minimum thickness of the inner portion is greater than the thickness of the deformation portion and the thickness of the outer portion; a transition portion is provided between the inner portion and the deformation portion, and the thickness of the transition portion is greater than the thickness of the deformation portion and the thickness of the outer portion.

10. A check valve, characterized in that: It includes a valve body, two valve holes located obliquely and symmetrically in the valve body, and two groups of valve plates symmetrically arranged and used to open and close the two valve holes. The valve plates are the valve plates described in any one of claims 1-9; the valve holes are formed with a protruding edge that presses against the deformation part for sealing.

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