Triple-eccentric bidirectional metal sealing butterfly valve

Abstract

The triple-eccentric bidirectional metal sealing butterfly valve comprises a valve body, and a protruding part integrated with the valve body is arranged on the inner wall of the valve body; the butterfly plate pressing ring is arranged in the valve body along the inner wall of the protruding part. A butterfly plate is arranged on the butterfly plate pressing ring and then located in the valve body, and a valve shaft is arranged in the butterfly plate. The sealing ring is arranged between the butterfly plate pressing ring and the butterfly plate, the circumferential face of the sealing ring makes contact with the protruding part of the valve body, and the circumferential face of the sealing ring is in a circular arc shape. The circumferential face of the sealing ring, namely the contact face making contact with the protruding part on the valve body, is arranged to be in the arc shape, so that interference is not prone to occurring during opening and closing, the contact face is in the arc shape, the sealing face is not prone to being damaged, sealing can be achieved after the valve arrives at the position, sealing does not depend on torque any more, and sealing does not depend on deformation of the sealing ring any more. The performance is excellent, the torque is reduced, and the use requirement is met.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a three-eccentric bidirectional metal-sealed butterfly valve. Background Art

[0002] my country's valve industry is thriving, and butterfly valves are also favored by many application fields. In the past, ordinary butterfly valves have been difficult to meet the more severe application environment and more stringent performance requirements. The emergence of triple eccentric butterfly valves has changed the sealing material of butterfly valves, replacing the previous non-metallic sealing form with metal hard sealing. This design not only improves the service life of the butterfly valve sealing pair, but also resists high temperature and high pressure and has a good sealing effect, expanding the application field of butterfly valves.

[0003] The three-eccentric bidirectional metal-sealed butterfly valve has been developed in recent years. The sealing surface of the conventional three-eccentric butterfly valve is an inclined cone surface, and the length of the sealing surface at each angle is different. In this way, after the valve is opened and closed, the sealing line left is very thick, which means that a large torque is used to deform the sealing ring to seal, which causes the following two problems: first, the sealing surface of the valve body is easily damaged; second, the sealing ring is permanently deformed after a period of time and cannot rebound, thus failing to meet actual usage requirements. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a three-eccentric bidirectional metal sealing butterfly valve, the sealing contact surface of which is not easily damaged and has a good sealing effect.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a three-eccentric bidirectional metal sealing butterfly valve, comprising:

[0006] A valve body, wherein the inner wall of the valve body is provided with a protrusion integrally arranged therewith;

[0007] A butterfly plate pressure ring is arranged inside the valve body along the inner wall of the raised portion;

[0008] A butterfly plate is arranged on the butterfly plate pressure ring and then located inside the valve body, and a valve shaft is arranged inside the butterfly plate;

[0009] The sealing ring is arranged between the butterfly plate pressure ring and the butterfly plate, and the circumferential surface of the sealing ring contacts the raised portion of the valve body, wherein the circumferential surface of the sealing ring is in an arc shape.

[0010] Furthermore, the sealing ring is made of silicone rubber, ethylene propylene rubber, nitrile rubber, or fluorinated rubber.

[0011] Furthermore, a first card slot and a second card slot which are interconnected are provided at the lower end of the butterfly plate, and the first card slot is used to match the sealing ring, and the second card slot is used to match the butterfly plate pressure ring.

[0012] Furthermore, a sealing ring is provided above the sealing ring and between the butterfly plate.

[0013] Furthermore, the bottom of the lower surface of the butterfly plate is conical.

[0014] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0015] The three-eccentric bidirectional metal-sealed butterfly valve of the present invention sets the circumferential surface of the sealing ring, that is, the contact surface contacting the raised portion on the valve body, into an arc shape, so that it is not easy to interfere during switching, and the contact surface is an arc, so it is not easy to damage the sealing surface. At the same time, the valve can be sealed after it is in position, and it no longer relies on torque sealing or deformation of the sealing ring for sealing. It has excellent performance and reduces torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention is further described below in conjunction with the accompanying drawings:

[0017] Figure 1 A top view of the present invention;

[0018] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0019] Figure 3 for Figure 2 A magnified view of part B in FIG.

[0020] Wherein: 1. valve body; 2. butterfly plate pressure ring; 3. butterfly plate; 4. valve shaft; 5. sealing ring; 10. raised part; 50. arc shape. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0022] The present invention provides a three-eccentric bidirectional metal sealing butterfly valve to solve the problem that the sealing surface of the conventional three-eccentric butterfly valve in the prior art is an inclined cone surface, which makes the valve body sealing surface easy to be damaged, and the sealing ring is permanently deformed and cannot rebound after a period of time.

[0023] For ease of understanding, the specific process in the embodiments of the present application is described below. Figures 1 to 3A three-eccentric bidirectional metal-sealed butterfly valve in the embodiment of the present application comprises a valve body 1, a butterfly plate pressure ring 2, a butterfly plate 3, a valve shaft 4 and a sealing ring 5; a protrusion 10 integrally arranged therewith is provided on the inner wall of the valve body 1; the butterfly plate pressure ring 2 is arranged inside the valve body along the inner wall of the protrusion 10; the butterfly plate 3 is located inside the valve body after being arranged on the butterfly plate pressure ring, and a valve shaft 4 is arranged inside the butterfly plate; the sealing ring 5 is arranged between the butterfly plate pressure ring and the butterfly plate, and the circumferential surface of the sealing ring 5 contacts the protrusion of the valve body, wherein the side surface of the sealing ring 5 is in an arc shape 50.

[0024] The three-eccentric bidirectional metal-sealed butterfly valve of the present invention sets the side surface of the sealing ring 5, that is, the contact surface in contact with the raised portion 10 on the valve body 1, into an arc shape, so that it is not easy to interfere during switching, and the contact surface is an arc, so it is not easy to damage the sealing surface. At the same time, the valve can be sealed after it is in position, and it no longer relies on torque sealing or the deformation of the sealing ring 5 for sealing. It has excellent performance and reduces torque.

[0025] Furthermore, the sealing ring 5 is made of silicone rubber, ethylene propylene rubber, nitrile rubber, or fluorinated rubber. Of course, other materials can also be used as long as the requirements are met.

[0026] based on Figure 3 Furthermore, the lower end of the butterfly plate 3 is provided with a first card groove 30 and a second card groove 31 which are arranged in communication with each other. The first card groove 30 is used to match the sealing ring 5, and the second card groove 31 is used to match the butterfly plate pressure ring 2. In this way, during installation, the first card groove 30 and the second card groove 31 are allocated to match the sealing ring 5 and the butterfly plate pressure ring 2, which makes installation convenient and labor-saving.

[0027] based on Figure 3 Furthermore, a sealing ring 6 is provided between the upper part of the sealing ring 5 and the butterfly plate 4, thereby enhancing the sealing performance of the upper surface of the sealing ring 5 and the first groove in the lower surface of the butterfly plate 4.

[0028] based on Figure 3 Furthermore, in the present embodiment, the bottom of the lower surface of the butterfly plate 3 is conical, so as to play a guiding role when the butterfly plate 3 is set on the butterfly plate pressure ring, thereby facilitating the installation of the butterfly plate 3.

[0029] In addition, when processing the sealing ring 5 in the butterfly valve, since the sealing surface on the sealing ring 5 is very narrow, which is just a point on the spherical surface, the roughness can be as low as 0.1. Secondly, the processing stroke is short, which is only the thickness of the sealing ring, shortening the processing time. It can be processed with an ordinary CNC lathe in conjunction with tooling. The operation is convenient, simple and labor-saving, which better meets the needs of use.

[0030] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A three-eccentric bidirectional metal-sealed butterfly valve, characterized in that: include: A valve body (1), wherein the inner wall of the valve body (1) is provided with a protrusion (10) integrally arranged therewith; A butterfly plate pressing ring (2) is arranged inside the valve body (1) along the inner wall of the raised portion (10); A butterfly plate (3) is arranged on the butterfly plate pressure ring (2) and then located inside the valve body (1), and a valve shaft (4) is arranged inside the butterfly plate (3); A sealing ring (5) is arranged between the butterfly plate pressure ring (2) and the butterfly plate (3), and a circumferential surface of the sealing ring (5) contacts a raised portion (10) of the valve body (1), wherein a side surface of the sealing ring (5) is in an arc shape (50).

2. The triple-eccentric bidirectional metal-sealed butterfly valve according to claim 1, characterized in that: The sealing ring (5) is made of silicone rubber, ethylene propylene rubber, nitrile rubber or fluorinated rubber.

3. The triple-eccentric bidirectional metal-sealed butterfly valve according to claim 1, characterized in that: The lower end of the butterfly plate (3) is provided with a first clamping groove and a second clamping groove which are arranged in communication with each other, and the first clamping groove is used to match the sealing ring (5), and the second clamping groove is used to match the butterfly plate pressure ring (2).

4. The triple-eccentric bidirectional metal-sealed butterfly valve according to claim 1, characterized in that: A sealing ring is also provided above the sealing ring (5) and between the butterfly plate (3).

5. The triple-eccentric bidirectional metal-sealed butterfly valve according to claim 1, characterized in that: The bottom of the lower surface of the butterfly plate (3) is conical.

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