Multi-layer sealing ring combined structure

Abstract

The utility model belongs to the technical field of valve equipment, and relates to a multi-layer sealing ring combined structure, which comprises a valve body, a valve shaft rotatably arranged in an upper shaft hole and a lower shaft hole of the valve body, a butterfly plate arranged in an inner cavity of the valve body and fixedly connected with the valve shaft, and a sealing ring mounted on a positioning boss of the butterfly plate and pressed and fixed by a sealing ring pressing ring. The end face of a lower shaft hole of the valve body is in sealing connection with the bottom cover. A valve seat is arranged on the valve body, and the sealing ring can be in sealing fit with the valve seat; the sealing ring is a metal sealing ring or a combination of a multi-layer sealing ring and a metal ring gasket, the assembly structure of the multi-layer sealing ring and the metal ring gasket is the same as the structure of the metal sealing ring, and the radial outer side of the multi-layer sealing ring can be matched with the sealing face of the valve seat. The same valve can be compatible with two kinds of sealing rings, the valve can meet the requirements of multiple working conditions after being exchanged, and the valve does not need to be independently arranged to cope with other working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of valve equipment technology and relates to a multi-layer sealing ring combination structure. Background Technology

[0002] Triple eccentric butterfly valves, due to their excellent flow regulation and sealing characteristics, have been one of the fastest-growing valve types in the past decade or so, widely used in chemical, metallurgical, energy, mining, urban construction, urban water supply, and drainage industries. The variety and quantity of valves used continue to expand, with trends towards high temperature, high pressure, large diameter, high sealing performance, long service life, and multi-functionality. Their reliability and other performance indicators have reached high levels. The sealing pair of the triple eccentric butterfly valve is the core component for achieving efficient sealing and stable operation. The sealing pair consists of a sealing ring and a valve seat sealing surface, which are tightly fitted through a specific geometric design. The valve seat and valve body are an integrated cast structure; the valve seat cannot be replaced, only the sealing ring can be replaced. Due to structural differences, the multi-layered sealing rings cannot be interchanged with metal sealing rings. To meet the needs of different operating conditions, users often need to configure multiple valve systems. Summary of the Invention

[0003] This invention addresses the aforementioned problems by providing a multi-layer sealing ring combination structure. This combination structure solves the problem that existing triple eccentric butterfly valve sealing rings cannot be fully interchanged. Without changing the valve structure and other parts, this structure enables complete interchangeability with metal sealing rings. The same valve can be compatible with two types of sealing rings. After interchangeability, the valve can adapt to multiple operating conditions without the need to configure separate valves for other operating conditions. Furthermore, when a single type of sealing ring is out of stock or damaged, it can be quickly replaced with another type, reducing downtime, improving production efficiency, and reducing customer losses.

[0004] According to the technical solution of this utility model: a multi-layer sealing ring combination structure, characterized in that: it includes a valve body, a valve shaft is rotatably arranged in the upper and lower shaft holes of the valve body, a butterfly plate is placed in the inner cavity of the valve body and fixedly connected to the valve shaft, a sealing ring is installed on the positioning boss of the butterfly plate, the sealing ring is pressed and fixed by a sealing ring pressure ring, the lower shaft hole end face of the valve body is sealed and connected to the bottom cover, and the sealing ring can be replaced.

[0005] A valve seat is constructed on the valve body, and a sealing ring can be sealed with the valve seat.

[0006] The sealing ring is a metal sealing ring or a combination of a multi-layer sealing ring and a metal ring gasket. The structure of the multi-layer sealing ring and the metal ring gasket is the same as that of the metal sealing ring. The radial outer side of the multi-layer sealing ring can mate with the sealing surface of the valve seat.

[0007] As a further improvement of this utility model, bushings are installed in the upper and lower shaft holes of the valve body to provide rotational support for the valve shaft.

[0008] As a further improvement of this utility model, the butterfly plate and the valve shaft are connected by a pin or a key.

[0009] As a further improvement of this utility model, the multi-layer sealing ring is composed of multiple metal substrates and non-metallic layers stacked alternately to form multiple sealing surfaces.

[0010] As a further improvement of this utility model, the inner wall of the multi-layer sealing ring is provided with a first semi-circular groove protruding towards the center, and the first semi-circular groove is matched with the groove of the metal ring gasket.

[0011] As a further improvement of this utility model, the metal ring pad is also machined with a second semi-circular groove that runs vertically through it to achieve installation and positioning. The second semi-circular groove is set on the inner wall of the metal ring pad and is located on the radially opposite side of the groove opening.

[0012] As a further improvement of this utility model, a first packing, a first upper shaft sleeve, a second upper shaft sleeve, a second packing, a sleeve and a gland are sequentially arranged on the stepped surface of the upper shaft hole of the valve body. The gland is fastened to the upper end of the valve body by bolts, and the bottom arc portion of the gland is pressed against the arc portion of the upper end of the sleeve.

[0013] As a further improvement of this utility model, a third packing and a first lower bushing are sequentially arranged in the lower shaft hole of the valve body.

[0014] The technical advantages of this invention are as follows: This invention uses a multi-layer sealing ring in conjunction with a metal ring gasket, avoiding valve structure processing or parts replacement. The dimensions of the multi-layer sealing ring assembly are completely consistent with the original all-metal sealing ring, allowing for seamless replacement, thus broadening the application range and saving modification costs and time. This multi-layer sealing ring assembly structure is rationally designed, simple in structure, easy to assemble, and can be assembled and maintained on-site, facilitating parts replacement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a structure with multiple layers of sealing rings.

[0016] Figure 2 This is a schematic diagram of a structure with an all-metal sealing ring installed.

[0017] Figure 3 This is the front view of the all-metal sealing ring.

[0018] Figure 4 yes Figure 3 Top view.

[0019] Figure 5 This is a schematic diagram of a multi-layered sealing ring.

[0020] Figure 6 yes Figure 5 Top view.

[0021] Figure 7 This is a schematic diagram of a metal ring gasket.

[0022] Figure 8 yes Figure 7 Top view. Detailed Implementation

[0023] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0025] Figure 1-8 The valve body includes a valve body 1, a butterfly plate 2, a valve shaft 3, a multi-layer sealing ring 4a, a first semi-circular groove 4a-1, a metal ring gasket 4b, a groove 4b-1, a second semi-circular groove 4b-2, an all-metal sealing ring 4, a sealing ring pressure ring 5, a bottom cover 6, a first packing 7, a first upper shaft sleeve 8, a second upper shaft sleeve 9, a second packing 10, a sleeve 11 and a gland 12, a third packing 13, and a first lower shaft sleeve 14, etc.

[0026] like Figure 1-8 As shown, this utility model is a multi-layer sealing ring assembly structure, including a valve body 1, a valve shaft 3 rotatably mounted in the upper and lower shaft holes of the valve body 1, a butterfly plate 2 placed in the inner cavity of the valve body 1 and fixedly connected to the valve shaft 3, a sealing ring installed on the positioning boss of the butterfly plate 2, and the sealing ring being pressed and fixed by a sealing ring pressure ring 5. The lower shaft hole end face of the valve body 1 is sealed and connected to the bottom cover 6, and the sealing ring can be replaced. In practice, the sealing ring pressure ring 5 is tightened and fixed by tightening the hexagon socket head cap screws.

[0027] A valve seat is constructed on the valve body 1. The position of the sealing ring and the valve seat is adjusted so that the sealing ring can seal with the valve seat.

[0028] The sealing ring adopts a combination of a metal sealing ring 4 or a multi-layer sealing ring 4a and a metal ring gasket 4b. The component structure of the multi-layer sealing ring 4a and the metal ring gasket 4b is the same as that of the metal sealing ring 4. The radial outer side of the multi-layer sealing ring 4a can mate with the sealing surface of the valve seat.

[0029] Bushings are installed in the upper and lower shaft holes of valve body 1 to provide rotational support for valve shaft 3.

[0030] The butterfly plate 2 is connected to the valve shaft 3 by a pin or key.

[0031] The multi-layer sealing ring 4a is composed of multiple alternating layers of metal substrate and non-metallic layers, forming multiple sealing surfaces. Each sealing surface functions independently, avoiding the risk of single-point failure. The metal sealing ring 4, on the other hand, requires a thicker design to achieve sufficient rigidity to withstand mechanical stresses under high temperature, high pressure differential, or other harsh operating conditions. Due to differences in material properties, sealing mechanisms, and operating requirements, the multi-layer sealing ring 4a and the metal sealing ring 4 have significantly different structural designs, from material composition to geometry.

[0032] The inner wall of the multi-layer sealing ring 4a is provided with a first semi-circular groove 4a-1 protruding towards the center, and the first semi-circular groove 4a-1 is matched with the groove opening 4b-1 machined in the metal ring gasket 4b.

[0033] The metal ring pad 4b is also machined with a second semi-circular groove 4b-2 that runs vertically through it to achieve installation positioning. The second semi-circular groove 4b-2 is set on the inner wall of the metal ring pad 4b and is located on the radially opposite side of the groove opening 4b-1.

[0034] The first packing 7, the first upper shaft sleeve 8, the second upper shaft sleeve 9, the second packing 10, the sleeve 11 and the gland 12 are sequentially arranged on the stepped surface of the upper shaft hole of the valve body 1. The gland 12 is fastened to the upper end of the valve body 1 by bolts, and the bottom arc portion of the gland 12 is pressed against the arc portion of the upper end of the sleeve 11.

[0035] The valve body 1 has a third packing 13 and a first lower shaft sleeve 14 installed in sequence in the lower shaft hole.

[0036] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A multi-layer sealing ring assembly structure, characterized in that: The valve body (1) is rotatably installed in the upper and lower shaft holes of the valve body (1). The butterfly plate (2) is placed in the inner cavity of the valve body (1) and fixedly connected to the valve shaft (3). A sealing ring is installed on the positioning boss of the butterfly plate (2). The sealing ring is pressed and fixed by the sealing ring pressure ring (5). The bottom cover (6) is sealed and connected to the lower shaft hole end face of the valve body (1). The sealing ring can be replaced. A valve seat is constructed on the valve body (1), and a sealing ring can seal with the valve seat; The sealing ring is a combination of a metal sealing ring (4) or a multi-layer sealing ring (4a) and a metal ring gasket (4b). The component structure of the multi-layer sealing ring (4a) and the metal ring gasket (4b) is the same as that of the metal sealing ring (4). The radial outer side of the multi-layer sealing ring (4a) can cooperate with the sealing surface of the valve seat.

2. The multi-layer sealing ring assembly structure as described in claim 1, characterized in that: A bushing is installed in the upper and lower shaft holes of the valve body (1) to provide rotational support for the valve shaft (3).

3. The multi-layer sealing ring assembly structure as described in claim 1, characterized in that: The butterfly plate (2) is connected to the valve shaft (3) by a pin or key.

4. The multi-layer sealing ring assembly structure as described in claim 1, characterized in that: The multi-layer sealing ring (4a) is composed of multiple metal substrates and non-metallic layers stacked alternately to form multiple sealing surfaces.

5. The multi-layer sealing ring assembly structure as described in claim 1, characterized in that: The inner wall of the multi-layer sealing ring (4a) is provided with a first semi-circular groove (4a-1) protruding towards the center, and the first semi-circular groove (4a-1) is matched with the groove (4b-1) machined in the metal ring gasket (4b).

6. The multi-layer sealing ring assembly structure as described in claim 5, characterized in that: The metal ring pad (4b) is also machined with a second semi-circular groove (4b-2) that runs vertically through the metal ring pad (4b) to achieve installation positioning. The second semi-circular groove (4b-2) is located on the inner wall of the metal ring pad (4b) and is located on the radially opposite side of the groove opening (4b-1).

7. The multi-layer sealing ring assembly structure as described in claim 1, characterized in that: The valve body (1) is provided with a first packing (7), a first upper shaft sleeve (8), a second upper shaft sleeve (9), a second packing (10), a sleeve (11), and a pressure cap (12) in sequence on the stepped surface of the upper shaft hole. The pressure cap (12) is fastened to the upper end of the valve body (1) by bolts, and the bottom arc of the pressure cap (12) is pressed against the arc of the upper end of the sleeve (11).

8. The multi-layer sealing ring assembly structure as described in claim 1, characterized in that: The valve body (1) is provided with a third packing (13) and a first lower bushing (14) in sequence in the lower shaft hole.

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