Valve sealing structure and valve

Abstract

The invention provides a valve sealing structure and a valve. The valve sealing structure comprises a valve seat part and a valve plate part, the valve seat part comprises a supporting seat and a valve seat, the supporting seat is a metal piece, the valve seat is a plastic piece, and the valve seat is elastically connected with the supporting seat; the valve plate part comprises a valve plate, a valve shaft and a cam, and a plane is arranged on the outer circular surface of the cam; mechanical abrasion between the valve plate and the valve seat is effectively reduced through cooperation of the valve seat and the cam, the problem that the valve plate extrudes the pipeline wall is solved, and the sealing performance of the valve is improved. The valve comprises the valve sealing structure, a valve body, a gland, a first pipeline sealing ring and a second pipeline sealing ring. The valve sealing structure is applied to the valve, the valve body, the gland and the pipeline sealing ring are combined, a complete sealing system is formed, medium leakage is effectively prevented, and normal work of the valve is guaranteed.

Description

Technical Field

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

[0002] In a conventional valve, a disc-shaped valve disc is connected to the valve shaft within the valve body's pipeline. Rotating the valve shaft drives the disc to rotate around its own axis within a range of 0°-90°. When opening, the rotation of the valve shaft drives the disc to gradually disengage from the body's sealing surface. The disc rotates around the valve shaft axis, and as the disc rotates, the distance between it and the body's sealing surface gradually increases until the disc rotates to 90° and is fully open. When closing, the disc rotates around the valve shaft axis from the 90° position, gradually approaching the body's sealing surface until it is in contact, achieving a sealed closure.

[0003] During the entire process, there is relative rotational friction between the valve disc and the valve body sealing surface. However, some eccentric valves (such as double eccentric and triple eccentric valves) use eccentric design to make the valve disc completely separate from the valve seat sealing surface earlier during the opening process, reducing mechanical wear between the sealing surfaces and extrusion deformation of the pipe wall.

[0004] However, even if the mechanical wear between the sealing surfaces is reduced, the mechanical wear between the valve plate and the valve seat and the extrusion of the pipe wall still exist. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a valve sealing structure and a valve to solve the problems of mechanical wear between the valve plate and the valve seat and the extrusion of the pipeline wall in the existing butterfly valve. The technical solution adopted by the present invention is: This application first proposes a valve sealing structure, including a valve seat portion and a valve plate portion; The valve seat portion includes a coaxially arranged support seat and a valve seat, the support seat is a metal part, the valve seat is a plastic part, the valve seat is elastically connected to the support seat, and one end of the valve seat extends out of the support seat; The valve plate portion includes a valve plate, a valve shaft connected to one side of the valve plate, and a cam sleeved on the valve shaft, wherein the cam faces the valve seat, and a flat surface is arranged on the outer circumferential surface of the cam; In the initial state, the valve seat is against the valve plate under the action of elastic force, the distance between the side of the valve seat and the valve shaft axis is m, the distance between the plane and the valve shaft axis is n, and the radius of the cam is r, where n<m<r.

[0006] Furthermore, the valve seat includes: The valve seat body is located between the support seat and the valve plate; A first ring is connected to one end of the valve seat body and extends into the support seat to be slidably connected thereto; The second ring is connected to the other end of the valve seat body, and the cam faces the second ring.

[0007] Further, a wave spring; A step is provided on the inner circumferential surface of the support seat, and the wave spring is squeezed between the bottom surface of the step and the valve seat.

[0008] Further, the valve seat outer ring and the valve seat inner ring; The outer ring of the valve seat is a metal part and is tightly matched with the outer circular surface of the second ring; The inner ring of the valve seat is a metal part and is tightly matched with the inner circular surface of the first circular ring; The outer ring of the valve seat faces the cam, and the wave spring abuts against the side surface of the inner ring of the valve seat.

[0009] Further, a first O-ring and a second O-ring; An inner annular groove is provided on the side surface of the step of the support seat, and the first O-ring is arranged in the inner annular groove and tightly fitted with the first circular ring; An outer annular groove is arranged on the outer circumferential surface of the support seat, and the second O-type sealing ring is arranged in the outer annular groove.

[0010] Furthermore, the inner circular surface of one end of the second ring is configured as an inner conical surface, and the outer circular surface of one side of the valve plate is configured as an outer conical surface, and the inner conical surface can fit with the outer conical surface.

[0011] Furthermore, the outer peripheral surface of the cam is spherical, so that the maximum radius of the cam is r1 and the minimum radius is r2, wherein n<r2<m<r1.

[0012] The present application also proposes a valve, comprising the valve sealing structure, and further comprising: a valve body, wherein the valve seat portion is axially disposed inside the valve body, and the valve plate portion is rotatably connected to the valve body in the radial direction; A gland, used to seal the gap between the valve plate and the valve body; The first pipeline sealing ring and the second pipeline sealing ring are respectively tightly fitted at two axial ends of the valve body.

[0013] Furthermore, the valve body further comprises: The limiting portion is arc-shaped and radially arranged on the inner circumferential surface of the valve body, and can abut against the side surface of the valve plate away from the valve seat portion.

[0014] Furthermore, the valve body further comprises: The ear is arranged on the outer surface of the valve body and is arranged in contact with the end surface of the valve body. A positioning hole is penetrated through the ear.

[0015] Advantages of the present invention: Through the cooperation between the valve seat and the cam, the mechanical wear and extrusion between the valve disc and the valve seat are effectively transferred to the space between the cam and the valve seat during the valve opening and closing process, effectively reducing the mechanical wear between the valve disc and the valve seat, solving the problem of the valve disc extruding the pipe wall, and improving the sealing performance of the valve; Through the structural coordination between the support seat and the valve seat, the entire valve seat is set into a modular structure, which can be removed from the valve as a whole. The first ring enables the valve seat to slide stably on the support seat, the second ring realizes the coordination between the valve seat and the cam, and the valve seat body limits the limit position of the first ring; The wave spring provides continuous elastic force to keep the valve seat in good contact with the valve plate at all times, thereby ensuring the sealing effect. It also buffers the impact force between the valve plate and the valve seat during the opening and closing process of the valve, further reducing wear. The outer ring and inner ring of the valve seat enhance the structural strength and stability of the valve seat, ensuring that the valve seat will not deform when subjected to force, thereby maintaining good sealing performance and facilitating the uniform transmission of the elastic force of the wave spring; The first O-ring can prevent the medium from leaking from the connection between the support seat and the valve seat, and can also maintain the connection between the support seat and the valve seat. The second O-ring prevents the medium from leaking from the connection between the support seat and the valve body, further improving the sealing performance of the valve; The inner and outer conical surfaces can better prevent medium leakage when the valve is closed, and cooperate with the movement of the valve plate to effectively reduce friction and wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view from a first perspective of the present invention.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3 This is a cross-sectional view from a second perspective of the present invention.

[0019] Figure 4 It is an assembly diagram between the cam and the valve seat portion of the present invention.

[0020] Figure 5 The axial cross-section of the cam.

[0021] Figure 6 It is a structural schematic diagram of the present invention.

[0022] Figure 7 It is a cross-sectional view from a third perspective of the present invention.

[0023] In the figure: 100-valve seat portion, 110-support seat, 120-valve seat, 120a-inner cone, 121-valve seat body, 122-first ring, 123-second ring, 123a-outer cone, 130-valve seat outer ring, 140-valve seat inner ring, 150-wave spring, 160-first O-type sealing ring, 170-second O-type sealing ring, 200-valve plate portion, 210-valve plate, 210a-outer cone, 220-valve shaft, 230-cam, 230a-outer circular surface, 230b-plane, 300-valve body, 310-limiting portion, 320-ear, 321-positioning hole, 400-pressure cover, 500-first pipe sealing ring, 600-second pipe sealing ring. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Please see the attached Figure 1 -Attached Figure 4 The present application first provides a valve sealing structure, comprising a valve seat portion 100 and a valve plate portion 200; the valve seat portion 100 comprises a coaxially arranged support seat 110 and a valve seat 120, the support seat 110 being a metal part, the valve seat 120 being a plastic part, the valve seat 120 being elastically connected to the support seat 110, and one end of the valve seat 120 extending out of the support seat 110; the valve plate portion 200 comprises a valve plate 210, a valve shaft 22 connected to one side of the valve plate 210, 0 and a cam 230 sleeved on the valve shaft 220, the cam 230 facing the valve seat 120, and a flat surface 230b is arranged on the outer circular surface 230a of the cam 230; in the initial state, the valve seat 120 is against the valve plate 210 under the action of elastic force, the distance between the side surface of the valve seat 120 and the axis of the valve shaft 220 is m, the distance between the flat surface 230b and the axis of the valve shaft 220 is n, and the radius of the cam 230 is r, wherein n<m<r.

[0026] The specific sealing operation is as follows: Initially, the valve is closed. At this point, the valve plate 210's rotation angle is 0°, the valve seat 120 is fully in contact with the valve plate 210 due to elastic force, and the flat surface 230b is parallel to the side of the valve seat 120, thus sealing the valve. When the valve shaft 220 rotates the valve plate 210, because n < m < r, the outer surface 230a first contacts and pushes the valve seat outer ring 130, causing the valve seat outer ring 130 to elastically move the valve seat 120 toward the support seat 110 and separate from the valve plate 210. Continued rotation of the valve shaft 220 instantly adjusts the rotation angle of the valve plate 210, thereby adjusting the degree of valve opening. In one specific embodiment, r = (1.1-1.2)n. By limiting the distance between r and n, the angle of valve plate rotation at the moment of valve opening can be further limited, so that the relative friction between the valve plate 210 and the valve seat 120 at the moment of opening can be negligible.

[0027] Therefore, through the cooperation between the valve seat 120 and the cam 230, the mechanical wear and extrusion between the original valve plate 210 and the valve seat part 100 are effectively transferred to between the cam 230 and the valve seat 120 during the opening and closing process of the valve, effectively reducing the mechanical wear between the valve plate and the valve seat, solving the problem of the valve plate squeezing the pipeline wall, and improving the sealing performance of the valve.

[0028] In one embodiment, please refer to the attached Figure 1 -Attached Figure 3 The valve seat 120 includes: a valve seat body 121, located between the support seat 110 and the valve plate 210; a first ring 122, connected to one end of the valve seat body 121, extending into the support seat 110 and slidingly connected thereto; a second ring 123, connected to the other end of the valve seat body 121, and the cam 230 is facing the second ring 123.

[0029] Specifically, in the attached Figure 2 In the embodiment, the valve seat 120 and the support seat 110 form a modular valve seat portion 100, which can be removed and assembled from the valve body 300 as a whole. Specifically, the valve seat body 121 acts as a limiting component, preventing the first circular ring 122 from sliding beyond the travel distance toward the support seat 110. After the valve seat portion 100 is installed, the second circular ring 123 increases the mating area between the valve seat 120 and the valve body 300, thereby ensuring accurate axial positioning and axial sliding stability of the valve seat 120. In summary, the valve seat 120 made of plastic not only realizes the sealing function of the valve, but also has accurate axial positioning function and stable sliding function.

[0030] In order to realize the elastic connection between the valve seat 120 and the support seat 110, in a specific embodiment, please refer to the attached Figure 2 , further comprising a wave spring 150; a step is provided on the inner circular surface of the support seat 110, and the wave spring 150 is squeezed between the bottom surface of the step and the valve seat 120.

[0031] The wave spring 150 only requires a smaller compression distance. Therefore, on the basis of the sliding cooperation between the first ring 122 and the side of the step to achieve the sliding purpose of the first ring 122, the axial distance between the end face of the first ring 122 and the step of the support seat 110 can be directly used to hide the installation of the wave spring 150, that is, there is no need to consider the installation space of the elastic part separately, and it can avoid the interference of the movement of the wave spring 150 with other components to cause elastic jamming.

[0032] In this specific embodiment, the wave spring 150 can be increased in thickness by stacking multiple pieces, thereby increasing the adjustment range of the elastic force.

[0033] In other specific embodiments, the wave spring can be replaced by other rubber elastic elements or cylindrical springs, which can also provide a certain elastic force and buffering effect.

[0034] In one embodiment, to enhance the structural strength and stability of the valve seat, please refer to the attached Figure 2 , further comprising a valve seat outer ring 130 and a valve seat inner ring 140; the valve seat outer ring 130 is a metal part, tightly fitted with the outer circular surface of the second circular ring 123; the valve seat inner ring 140 is a metal part, tightly fitted with the inner circular surface of the first circular ring 122; wherein, the valve seat outer ring 130 is opposite to the cam 230, and the wave spring 150 is against the side surface of the valve seat inner ring 140.

[0035] Specifically, in the attached Figure 2 It can be intuitively seen that a step is set at each axial end of the valve seat 120, reserving installation positions for the valve seat inner ring 140 and the valve seat outer ring 130, so that the inner and outer circular surfaces of the valve seat 120 are smooth and flat, without a protruding structure, and the overall thickness of the valve seat 120 is reduced, so that the medium flow is guaranteed to the greatest extent.

[0036] When the valve is opened or closed, if the plastic valve seat 120 directly contacts the metal cam 230 or wave spring 150, the softening and deformation of the valve seat 120 will increase. Therefore, on the one hand, the valve seat outer ring 130 acts as a force carrier between the cam 230 and the valve seat 120, and the valve seat inner ring 140 acts as a force carrier between the valve seat 120 and the wave spring 150, effectively enhancing the structural strength and stability of the valve seat 120 and reducing its deformation rate. On the other hand, due to the tight fit between the inner valve seat outer ring and the valve seat 120, combined with the modular structure of the valve seat portion 100, the structural strength of the valve seat portion 100 as a whole is further enhanced.

[0037] In this embodiment, in order to increase the contact area between the valve seat 120 and the valve plate 210 and ensure the sealing effect, please refer to the attached Figure 2The inner circular surface of one end of the second ring 123 is configured as an inner conical surface 123a, and the outer circular surface of one side of the valve plate 210 is configured as an outer conical surface 210a, and the inner conical surface 123a can fit together with the outer conical surface 210a.

[0038] As attached Figure 2 As shown, the cooperation between the inner conical surface 123a and the outer conical surface 210a enables the valve plate 210 to exert radial tension on the second circular ring 123, preventing the second circular ring 123 from softening and deforming through the valve seat outer ring 130. The cooperation between the support seat 110 and the first circular ring 122 enables the support seat 110 to exert radial tension on the first circular ring 122, preventing the first circular ring 122 from softening and deforming through the valve seat inner ring 140, thereby enhancing the structural strength of the valve seat 120. Combined with the opening and closing actions of the valve, the valve seat outer ring 130 and the valve seat inner ring 140 have the effect of improving the structural strength of the valve seat 120 in both the axial and radial directions.

[0039] In one embodiment, in order to achieve the sealing of the support seat 110 and the connection between the valve seat 120 and the support seat 110, a first O-ring 160 and a second O-ring 170 are also included; an inner annular groove is provided at the step side of the support seat 110, and the first O-ring 160 is arranged in the inner annular groove and is tightly matched with the first circular ring 122; an outer annular groove is provided at the outer circumferential surface of the support seat 110, and the second O-ring 170 is arranged in the outer annular groove.

[0040] The support seat 110 is tightly fitted with the valve body 300 through an interference fit, and the second O-ring 170 is used to achieve a sealing effect to prevent the medium from leaking from the gap between the support seat 110 and the valve body 300; the first ring 122 uses the elasticity of the second O-ring 170 and the structure of the outer annular groove to enable the first ring 122 to slide along the step side of the support seat 110 without falling off the support seat 110 and to achieve a sealing effect, without the need to add an additional sliding connection structure between the first ring 122 and the support seat 110.

[0041] In one embodiment, please refer to the attached Figure 4 and attached Figure 5 The outer peripheral surface of the cam 230 is spherical, so that the maximum radius of the cam 230 is r1 and the minimum radius is r2, wherein n<r2<m<r1. Figure 5 The outer peripheral surface of the middle cam 230 is an arc surface, which reduces the contact area between the cam 230 and the outer ring of the valve seat, thereby reducing the friction between the two and making the opening and closing of the valve smoother.

[0042] Please see the attached Figure 6 and attached Figure 7The present application also proposes a valve, including the valve sealing structure described above, and further including: a valve body 300, the valve seat portion 100 is axially arranged inside the valve body 300, and the valve plate portion 200 is rotatably connected to the valve body 300 in the radial direction; a pressure cover 400, used to seal the gap between the valve plate portion 200 and the valve body 300; a first pipe sealing ring 500 and a second pipe sealing ring 600, which are respectively tightly fitted at the axial ends of the valve body 300.

[0043] Specifically, as attached Figure 7 As shown, a step is formed on the inner surface of one end of the valve body 300, and the support seat 110 is pressed inward from one end of the valve body 300 against the step. The first pipe sealing ring 500 is pressed into the valve body 300 and embedded in the outer ring 110 of the valve body, and then the position of the support seat 110 in the valve body 300 is fixed. A step is also formed on the inner surface of the other end of the valve body 300, and the second pipe sealing ring 600 is pressed into the valve body 300 and fixed against the step. The two pipe sealing rings facilitate the sealed connection between the valve and the pipeline. By applying the above-mentioned valve sealing structure to the valve, combined with the valve body, pressure cover and pipe sealing ring, a complete sealing system is formed, which effectively prevents leakage of the medium and ensures the normal operation of the valve.

[0044] In one embodiment, in order to locate the position of the valve plate 210 when the valve is closed and prevent the valve plate 210 from excessive rotation, please refer to the attached Figure 7 The valve body 300 further includes a limiting portion 310 , which is arc-shaped and radially arranged on the inner circular surface of the valve body 300 and can abut against the side of the valve plate 210 away from the valve seat portion 100 .

[0045] Specifically, the limiting portion 310 is divided into two, which are symmetrical with respect to the axis of the valve shaft 220; since the valve plate 210 and the valve shaft 220 are eccentrically arranged, the arc structure of the limiting portion 310 does not affect the rotation of the valve plate 210 when the valve is opened and closed, so it will not interfere with the stroke of the valve plate 210.

[0046] In one embodiment, please refer to the attached Figure 6 In order to facilitate the connection between the valve body 300 and the pipelines at both ends, the valve body 300 also includes an ear 320, which is arranged on the outer surface of the valve body 300 and is arranged in contact with the end surface of the valve body 300. A positioning hole 321 is provided through the ear 320.

[0047] Specifically, ears 320 are respectively provided at four corners of both end surfaces of the valve body 300 , and positioning holes 321 on the ears are used to facilitate the passage of bolts, thereby facilitating the connection of the valve body 300 with other pipe joints or flanges.

[0048] In summary, the valve sealing structure and valve of the present application effectively solve the problems of mechanical wear between the valve plate and valve seat and pipe wall extrusion in the existing butterfly valve through unique structural design and component coordination, thereby improving the sealing performance and service life of the valve.

[0049] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A valve sealing structure, characterized in that: It comprises a valve seat portion (100) and a valve plate portion (200); The valve seat portion (100) comprises a coaxially arranged support seat (110) and a valve seat (120), wherein the support seat (110) is a metal part, and the valve seat (120) is a plastic part. The valve seat (120) is elastically connected to the support seat (110), and one end of the valve seat (120) extends out of the support seat (110). The valve plate portion (200) comprises a valve plate (210), a valve shaft (220) connected to a side surface of the valve plate (210), and a cam (230) sleeved on the valve shaft (220), wherein the cam (230) faces the valve seat (120), and a flat surface (230b) is arranged on the outer circular surface (230a) of the cam (230); In the initial state, the valve seat (120) is pressed against the valve plate (210) under the action of elastic force, the distance between the side surface of the valve seat (120) and the axis of the valve shaft (220) is m, the distance between the plane (230b) and the axis of the valve shaft (220) is n, and the radius of the cam (230) is r, wherein n<m<r.

2. The valve sealing structure according to claim 1, wherein: The valve seat (120) comprises: A valve seat body (121) is located between the support seat (110) and the valve plate (210); A first circular ring (122) is connected to one end of the valve seat body (121) and extends into the support seat (110) to be slidably connected thereto; The second circular ring (123) is connected to the other end of the valve seat body (121), and the cam (230) faces the second circular ring (123).

3. The valve sealing structure according to claim 2, wherein: The valve seat portion (100) further includes: a wave spring (150); A step is provided on the inner circular surface of the support seat (110), and the wave spring (150) is squeezed between the bottom surface of the step and the valve seat (120).

4. The valve sealing structure according to claim 3, characterized in that: The valve seat portion (100) further includes: a valve seat outer ring (130) and a valve seat inner ring (140); The valve seat outer ring (130) is a metal part and is tightly matched with the outer circular surface of the second circular ring (123); The valve seat inner ring (140) is a metal part and is tightly matched with the inner circular surface of the first circular ring (122); The valve seat outer ring (130) faces the cam (230), and the wave spring (150) abuts against the side surface of the valve seat inner ring (140).

5. The valve sealing structure according to claim 1, wherein: The valve seat portion (100) further includes: a first O-type sealing ring (160) and a second O-type sealing ring (170); An inner annular groove is provided on the side of the step of the support seat (110), and the first O-type sealing ring (160) is arranged in the inner annular groove and tightly matched with the first circular ring (122); An outer annular groove is provided on the outer circumferential surface of the support seat (110), and the second O-type sealing ring (170) is arranged in the outer annular groove.

6. The valve sealing structure according to claim 2, wherein: An inner conical surface (123a) is configured on the inner circular surface of one end of the second circular ring (123), and an outer conical surface (210a) is configured on the outer circular surface of one side of the valve plate (210), and the inner conical surface (123a) can fit with the outer conical surface (210a).

7. The valve sealing structure according to claim 2, wherein: The outer peripheral surface of the cam (230) is spherical, so that the maximum radius of the cam (230) is r1 and the minimum radius is r2, wherein n<r2<m<r1.

8. A valve, characterized in that: The valve sealing structure according to any one of claims 1 to 7 further comprises: A valve body (300), wherein the valve seat portion (100) is axially arranged inside the valve body (300), and the valve plate portion (200) is rotatably connected to the valve body (300) in the radial direction; A gland (400) for sealing a gap between the valve plate portion (200) and the valve body (300); The first pipeline sealing ring (500) and the second pipeline sealing ring (600) are respectively tightly fitted at the two axial ends of the valve body (300).

9. The valve according to claim 8, wherein The valve body (300) further includes: The limiting portion (310) is arranged in an arc shape along the radial direction on the inner circular surface of the valve body (300) and is capable of abutting against the side of the valve plate (210) away from the valve seat portion (100).

10. The valve according to claim 8, wherein The valve body (300) further includes: The ear (320) is provided on the outer surface of the valve body (300) and is arranged to fit the end surface of the valve body (300). A positioning hole (321) is provided through the ear (320).

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