Sealing structure and angle type pulse back flushing valve

Abstract

The utility model relates to the technical field of valves, in particular to a sealing structure and an angle type pulse blowback valve. The sealing structure comprises a valve cover, a valve element and a sealing element, the valve rod is arranged in the valve cavity, the first end of the valve rod extends out of the valve cavity in the opening direction of the valve cavity, the valve rod is sleeved with a sealing piece, the sealing piece is located at the opening of the valve cavity, the peripheral face of the sealing piece abuts against the inner wall of the valve cavity, one end of the sealing piece is provided with an extending part extending towards the first end of the valve rod, and the extending part is located outside the valve cavity. A fixing piece is arranged on the extending part; the valve rod is sleeved with the corrugated pipe, and one end of the corrugated pipe is fixedly connected with the end, away from the extending part, of the sealing piece. The gap between the opening of the valve cavity and the valve rod is sealed by the sealing piece, so that a medium can be prevented from entering the corrugated pipe, welding in the prior art is avoided, the coaxiality of the valve rod can be ensured, and the sealing performance of the valve is prevented from being influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a sealing structure and an angle pulse back-blowing valve. Background Art

[0002] In the prior art, the sealing of the bellows is usually performed by welding, where one end of the bellows is sleeved on the valve stem, and then the end of the bellows is welded to the valve body. However, since the valve stem is usually a slender rod, a large amount of heat will be generated when the bellows is welded. The valve stem will be deformed due to the welding heat, thereby affecting the coaxiality of the valve stem, causing the valve stem to be stuck and eccentrically worn during the valve opening and closing process. At the same time, the bellows is subjected to uneven force during the opening and closing process, affecting the sealing performance of the valve. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is that the valve stem will be deformed due to welding heat, thereby affecting the coaxiality of the valve stem, causing the valve stem to be stuck and wear eccentrically during the valve switching process, and at the same time causing the bellows to be subjected to uneven force during the switching process, affecting the sealing performance of the valve, thereby providing a sealing structure and an angle pulse back-blow valve.

[0004] In order to solve the above problems, the utility model provides a sealing structure, including:

[0005] A valve cover having a valve cavity therein;

[0006] A valve stem is arranged in the valve cavity, a first end of the valve stem extends to the outside of the valve cavity along the opening direction of the valve cavity, a sealing member is sleeved on the valve stem, the sealing member is located at the opening of the valve cavity, an outer peripheral surface of the sealing member abuts against an inner wall of the valve cavity, one end of the sealing member has an extension portion extending toward the first end of the valve stem, the extension portion is located outside the valve cavity, and a fixing member is provided on the extension portion;

[0007] A bellows is sleeved on the valve stem, and one end of the bellows is fixedly connected to an end of the sealing member away from the extension portion.

[0008] Furthermore, it also includes:

[0009] The bracket has a side surface that fits with the side where the valve cavity opening is located, the bracket is fixedly connected to the valve cover, and a groove is provided on the side where the bracket fits with the valve cover, and both sides of the groove abut against the outer peripheral surface of the fixing member.

[0010] Furthermore, a cavity is provided between the outer peripheral surface of the sealing element and the inner wall of the valve cavity, and a sealing gasket is provided in the cavity.

[0011] Furthermore, a bearing is provided between the extension portion and the valve stem, an outer ring of the bearing is in contact with an inner wall of the extension portion, and an inner ring of the bearing is sleeved on the valve stem.

[0012] Furthermore, the inner wall of the valve cavity has a first convex portion, and the end of the seal away from the extension portion has a second convex portion, the first convex portion abuts against the seal, and the second convex portion abuts against the inner wall of the valve cavity, a cavity is formed between the first convex portion and the second convex portion, and the sealing gasket is arranged in the cavity.

[0013] Furthermore, the fixing piece is a round nut, the outer wall of the extension portion has an external thread, and the round nut is threadedly connected to the extension portion.

[0014] Furthermore, the fitting surface between the second protrusion and the sealing gasket and the fitting surface between the sealing gasket and the second protrusion are both inclined surfaces.

[0015] The utility model also provides an angle pulse back-blow valve, comprising: a sealing structure and a valve body, wherein the valve body has a medium channel, the valve cover is fixedly connected to the valve body, the valve cavity is communicated with the medium channel, the valve body has a valve, the second end of the valve stem is fixedly connected to the valve, and the other end of the bellows is fixedly connected to the valve.

[0016] The utility model has the following advantages:

[0017] The utility model discloses a sealing structure, in which a sealing member is arranged in the gap between a valve cavity opening and a valve stem, the sealing member is sleeved on the valve stem, the sealing member has an extension section, a fixing member can fix the extension section of the sealing member, one end of a bellows is connected to the sealing member, so that the sealing member seals the gap between the valve cavity opening and the valve stem, and can also prevent the medium from entering the bellows, thus avoiding welding in the prior art, ensuring the coaxiality of the valve stem, and preventing the sealing performance of the valve from being affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the sealing structure in the first embodiment of the present utility model;

[0020] Figure 2 for Figure 1 A magnified view of part A;

[0021] Description of reference numerals:

[0022] 1. Valve cover; 2. Valve chamber; 3. Valve stem; 4. Seal; 5. Extension; 6. Bellows; 7. Bracket; 8. Sealing gasket; 9. Bearing; 10. First convex part; 11. Second convex part; 12. Round nut. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Embodiment 1

[0028] like Figure 1 and Figure 2As shown, this embodiment discloses a sealing structure, including: a valve cover 1, a valve stem 3 and a bellows 6. The valve cover 1 has a valve cavity 2. The valve stem 3 is arranged in the valve cavity 2, and the first end of the valve stem 3 extends to the outside of the valve cavity 2 along the opening direction of the valve cavity 2. A sealing member 4 is sleeved on the valve stem 3, and the sealing member 4 is located at the opening of the valve cavity 2. The outer peripheral surface of the sealing member 4 abuts against the inner wall of the valve cavity 2. One end of the sealing member 4 has an extension portion 5 extending toward the first end of the valve stem 3, and the extension portion 5 is located outside the valve cavity 2. A fixing member is provided on the extension portion 5. The bellows 6 is sleeved on the valve stem 3, and one end of the bellows 6 is fixedly connected to the end of the sealing member 4 away from the extension portion 5.

[0029] Specifically, a valve cavity 2 is provided in the valve cover 1, and the valve cavity 2 is coaxial with the valve cover 1. A valve stem 3 is arranged in the valve cavity 2, and the upper end of the valve stem 3 is a first end. Both the upper and lower ends of the valve cavity 2 have openings. The upper end of the valve stem 3 extends from the upper end opening of the valve cavity 2 to the outside of the valve cavity 2. A sealing member 4 is sleeved on the valve stem 3. The sealing member 4 is located in the gap between the valve stem 3 and the upper end opening of the valve cavity 2. The outer wall of the sealing member 4 abuts against the inner wall of the valve cavity 2. The sealing member 4 can close the upper end opening of the valve cavity 2. The upper end of the sealing member 4 has an extension portion 5 extending out of the valve cavity 2. A fixing member is provided on the extension portion 5. The fixing member can fix the extension portion 5 of the sealing member 4, thereby further fixing the sealing member 4. A bellows 6 is arranged in the valve cavity 2 and sleeved on the valve stem 3. The upper end of the bellows 6 is welded and fixed to the lower end of the sealing member 4, so as to seal the upper end of the bellows 6 and prevent the medium in the valve cavity 2 from entering the bellows 6.

[0030] It should be noted that the upper end of the bellows 6 and the lower end of the seal 4 need to be welded first, and then the bellows 6 and the seal 4 are sleeved on the valve stem 3 .

[0031] Preferably, in this embodiment, the fixing piece is a round nut 12 , the outer wall of the extension portion 5 has an external thread, and the round nut 12 is threadedly connected to the extension portion 5 .

[0032] Furthermore, it also includes a bracket 7. The side of the bracket 7 is in contact with the side where the valve cavity 2 opens, the bracket 7 is fixedly connected to the valve cover 1, and a groove is provided on the side where the bracket 7 is in contact with the valve cover 1, and the two sides of the groove are in contact with the outer peripheral surface of the fixing member.

[0033] Specifically, Figure 1 As shown, the lower side of the bracket 7 fits with the upper side of the valve cover 1, and the lower side of the bracket 7 has a groove, and the two side edges of the groove abut against the outer peripheral surface of the fixing member, thereby limiting and fixing the fixing member.

[0034] Furthermore, a bearing 9 is provided between the extension portion 5 and the valve stem 3 , the outer ring of the bearing 9 is in contact with the inner wall of the extension portion 5 , and the inner ring of the bearing 9 is sleeved on the valve stem 3 .

[0035] Specifically, Figure 2 As shown, in the prior art, fillers are usually used to seal the gaps. In this embodiment, bearings 9 are used. The valve thrust reduces the clamping force of the fillers. Bearings 9 can serve as a guide for the valve stem 3 and can also reduce the gap between the extension portion 5 and the valve stem 3 to prevent foreign objects such as water and dust from entering the valve stem 3 and the bellows 6 through the gap and affecting the telescopic movement of the bellows 6. This can effectively ensure that the service life of the bellows 6 is not affected.

[0036] Furthermore, there is a cavity between the outer circumferential surface of the seal 4 and the inner wall of the valve cavity 2, and a sealing gasket 8 is arranged in the cavity. The sealing gasket 8 and the round nut 12 cooperate to form a self-sealing structure, and when the bellows 6 is stretched, the force acts on the round nut 12; when the bellows 6 contracts, the sealing gasket 8 is compressed to assist in sealing and avoid the risk of leakage.

[0037] Furthermore, the inner wall of the valve cavity 2 has a first protrusion 10, and the end of the seal 4 away from the extension portion 5 has a second protrusion 11. The first protrusion 10 abuts against the seal 4, and the second protrusion 11 abuts against the inner wall of the valve cavity 2. A cavity is formed between the first protrusion 10 and the second protrusion 11, and the sealing gasket 8 is arranged in the cavity.

[0038] Specifically, Figure 2 As shown, the first convex portion 10 is located at the opening of the upper end of the valve cavity 2, and the first convex portion 10 abuts against the outer wall of the sealing member 4. The lower end of the sealing member 4 has a second convex portion 11, and a cavity is formed between the second convex portion 11 and the first convex portion 10, and the sealing gasket 8 is arranged in the cavity. The inner wall of the sealing gasket 8 abuts against the outer wall of the sealing member 4, and the outer wall of the sealing gasket 8 abuts against the inner wall of the valve cavity 2.

[0039] Further, such as Figure 2 As shown, the fitting surface between the second protrusion 11 and the sealing gasket 8 and the fitting surface between the sealing gasket 8 and the second protrusion 11 are both inclined surfaces.

[0040] Embodiment 2

[0041] This embodiment discloses an angle pulse back-blowing valve, including a sealing structure and a valve body. The sealing structure is the sealing structure described in the first embodiment, the valve body has a medium channel, the valve cover 1 is fixedly connected to the valve body, the valve cavity 2 is connected to the medium channel, the valve body has a valve, the second end of the valve stem 3 is fixedly connected to the valve, and the other end of the bellows 6 is fixedly connected to the valve.

[0042] Specifically, the lower end of the valve stem 3 is the second end, the lower end of the valve stem 3 is fixedly connected to the valve, and the lower end of the bellows 6 is fixedly connected to the valve, so that the lower end of the bellows 6 can be sealed, and the valve stem 3 can axially reciprocate in the valve cavity 2, and make the valve close or open the medium channel.

[0043] Furthermore, a driving structure is also provided at the upper end of the bracket 7, and the upper end of the valve stem 3 passes through the bracket 7 and is connected to the driving structure. The driving structure can drive the valve stem 3 to perform axial reciprocating motion.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A sealing structure, characterized in that: include: A valve cover (1), wherein the valve cover (1) has a valve cavity (2); A valve stem (3) is arranged in the valve cavity (2), the first end of the valve stem (3) extends along the opening direction of the valve cavity (2) to the outside of the valve cavity (2), a sealing member (4) is sleeved on the valve stem (3), the sealing member (4) is located at the opening of the valve cavity (2), the outer peripheral surface of the sealing member (4) abuts against the inner wall of the valve cavity (2), one end of the sealing member (4) has an extension portion (5) extending toward the first end of the valve stem (3), the extension portion (5) is located outside the valve cavity (2), and a fixing member is provided on the extension portion (5); A bellows (6) is sleeved on the valve stem (3), and one end of the bellows (6) is fixedly connected to an end of the sealing member (4) that is away from the extension portion (5).

2. The sealing structure according to claim 1, characterized in that: Also includes: A bracket (7), wherein the side surface of the bracket (7) is in contact with the side where the valve cavity (2) opens, the bracket (7) is fixedly connected to the valve cover (1), and a groove is provided on the side surface where the bracket (7) and the valve cover (1) are in contact, and the two sides of the groove are in contact with the outer peripheral surface of the fixing member.

3. The sealing structure according to claim 2, characterized in that: A cavity is provided between the outer peripheral surface of the sealing member (4) and the inner wall of the valve cavity (2), and a sealing gasket (8) is provided in the cavity.

4. The sealing structure according to claim 1, characterized in that: A bearing (9) is arranged between the extension portion (5) and the valve stem (3); the outer ring of the bearing (9) is in contact with the inner wall of the extension portion (5), and the inner ring of the bearing (9) is sleeved on the valve stem (3).

5. The sealing structure according to claim 3, characterized in that: The inner wall of the valve cavity (2) has a first convex portion (10), and the end of the sealing member (4) away from the extension portion (5) has a second convex portion (11), the first convex portion (10) abuts against the sealing member (4), and the second convex portion (11) abuts against the inner wall of the valve cavity (2), a cavity is formed between the first convex portion (10) and the second convex portion (11), and the sealing gasket (8) is arranged in the cavity.

6. The sealing structure according to any one of claims 1 to 5, characterized in that: The fixing member is a round nut (12), the outer wall of the extension portion (5) has an external thread, and the round nut (12) is threadedly connected to the extension portion (5).

7. The sealing structure according to claim 5, characterized in that: The fitting surface between the second convex portion (11) and the sealing gasket (8) and the fitting surface between the sealing gasket (8) and the second convex portion (11) are both inclined surfaces.

8. An angle pulse back-blowing valve, characterized in that: include: The sealing structure and valve body according to any one of claims 1 to 6, wherein the valve body has a medium channel, the valve cover (1) is fixedly connected to the valve body, the valve chamber (2) is communicated with the medium channel, the valve body has a valve, the second end of the valve stem (3) is fixedly connected to the valve, and the other end of the bellows (6) is fixedly connected to the valve.

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