Valve body and cover connecting structure

Abstract

A valve body and cover connecting structure comprises a valve body and a valve cover, the top end of the valve body is provided with a lower connecting flange, the lower end of the valve cover is provided with an upper connecting flange which can be connected with the lower connecting flange in a matched mode, and the upper connecting flange of the valve cover is fixedly connected with the lower connecting flange of the valve body through a bolt. Annular protrusions are arranged on the opposite sides of the lower connecting flange and the upper connecting flange respectively, two vertically-overlapped annular gaskets are arranged between the two annular protrusions, inner rings of the two annular gaskets and the two annular protrusions are continuously welded and sealed respectively to form inner sealing weld joints, the outer ring diameter of the annular gaskets is larger than that of the annular protrusions, and the outer ring diameter of the annular gaskets is larger than that of the annular protrusions. The edges of the outer rings of the two annular gaskets are continuously welded and sealed to form an outer sealing weld joint. The sealing and fastening of the valve body and the valve cover are separately designed, so that the valve body and the valve cover can be sealed and fastened, and when the valve is maintained, only an outer sealing welding seam at the edge of the outer ring of the annular gasket needs to be polished, and the valve can be disassembled.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a valve body and cover connection structure. Background Art

[0002] As Figure 2 shown, currently, the connection between the valve body 100 and the valve cover 200 of valves generally uses concave-convex surface positioning in the industry, and then a welding groove is machined outside the concave-convex surface for welding. This groove is used for both sealing and fastening, and the designed weld seam is very large, which is not conducive to welding. Moreover, when problems occur inside the valve after welding and need to be repaired, disassembly and assembly are inconvenient. Content of the Utility Model

[0003] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a valve body and cover connection structure.

[0004] To solve the above problems, the utility model adopts the following technical scheme:

[0005] A valve body and cover connection structure includes a valve body and a valve cover. The top end of the valve body has a lower connecting flange, and the lower end of the valve cover has an upper connecting flange that can be cooperatively connected with the lower connecting flange. The upper connecting flange of the valve cover and the lower connecting flange of the valve body are fixedly connected by bolts. On the opposite sides of the lower connecting flange and the upper connecting flange, there are respectively provided annular protrusions. Between the two annular protrusions, there are two annular gaskets overlapping up and down. The inner circles of the two annular gaskets are continuously welded and sealed with the two annular protrusions to form an inner sealing weld seam. The outer diameter of the outer circle of the annular gasket is larger than the outer diameter of the annular protrusion, so that the outer edge of the outer circle of the annular gasket protrudes from the outer edge of the annular protrusion. The outer edges of the outer circles of the two annular gaskets are continuously welded and sealed to form an outer sealing weld seam.

[0006] Preferably, the annular gasket is made of metal material.

[0007] Advantages of the Utility Model

[0008] Compared with the prior art, the advantages of the utility model are as follows:

[0009] In the present utility model, the sealing and fastening of the valve body and the valve cover are designed separately. The three weld seams, where the inner rings of the two annular gaskets are continuously welded and sealed with the two annular protrusions respectively and the outer edges of the outer rings of the two annular gaskets are continuously welded and sealed, are only used for achieving sealing. The weld seams can be designed to be very small. Then, the upper connecting flange of the valve cover and the lower connecting flange of the valve body are fixedly connected by bolts, so as to ensure that the valve body and the valve cover can be both sealed and fastened. When the valve is being repaired, only the outer sealing weld seam at the outer edge of the annular gasket needs to be ground off, and then it can be disassembled. After the repair is completed, the outer edge of the annular gasket is re-welded to form a new outer sealing weld seam. Moreover, since the outer edge of the annular gasket protrudes from the outer edge of the annular protrusion, no damage will be caused to the valve body and the valve cover body during grinding. When the annular gasket is worn out too much, a new annular gasket can be replaced directly. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural view of the present utility model;

[0011] Figure 2 is a schematic view of the connection structure of the valve body and the valve cover of the existing valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0013] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper / lower end", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0014] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, terms such as "installation", "provided with / set with", "socket connection", "connection", etc. should be understood in a broad sense. For example, "connection" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0015] Please refer to Figure 1 , the present utility model provides a technical solution: a valve body and cover connection structure, including a valve body 1 and a valve cover 2. The top end of the valve body 1 has a lower connecting flange 11, and the lower end of the valve cover 2 has an upper connecting flange 21 that can be cooperatively connected with the lower connecting flange 11. The upper connecting flange 21 of the valve cover 2 and the lower connecting flange 11 of the valve body 1 are fixedly connected by bolts 5. Annular protrusions 3 are respectively arranged on the opposite sides of the lower connecting flange 11 and the upper connecting flange 21. Two annular gaskets 4 that overlap up and down are arranged between the two annular protrusions 3. The inner rings of the two annular gaskets 4 are continuously welded and sealed with the two annular protrusions 3 to form an inner sealing weld 6. The outer diameter of the outer ring of the annular gasket 4 is larger than the outer diameter of the annular protrusion 3, so that the outer edge of the outer ring of the annular gasket 4 protrudes from the outer edge of the annular protrusion 3. The outer edges of the outer rings of the two annular gaskets 4 are continuously welded and sealed to form an outer sealing weld 7.

[0016] The present utility model separately designs the sealing and fastening of the valve body 1 and the valve cover 2. The three welds where the inner rings of the two annular gaskets 4 are continuously welded and sealed with the two annular protrusions 3 and the outer edges of the outer rings of the two annular gaskets 4 are continuously welded and sealed are only used to achieve sealing. The welds can be designed to be very small. Then, the upper connecting flange 21 of the valve cover 2 and the lower connecting flange 11 of the valve body 1 are fixedly connected by bolts 5, so as to ensure that the body and the cover can be both sealed and tightened. When the valve is repaired, only the outer sealing weld 7 at the outer edge of the outer ring of the annular gasket 4 needs to be ground off, and then it can be disassembled. After the repair is completed, the outer edge of the outer ring of the annular gasket 4 is re-welded to form a new outer sealing weld 7. And because the outer edge of the outer ring of the annular gasket 4 protrudes from the outer edge of the annular protrusion 3, the valve body 1 and the valve cover 2 body will not be damaged during grinding. When the annular gasket 4 is excessively worn, a new annular gasket 4 can be replaced.

[0017] Specifically, the annular gasket 4 is made of metal material.

[0018] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0019] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve body-cover connection structure, comprising a valve body (1) and a valve cover (2), characterized in that: The top end of the valve body (1) has a lower connecting flange (11), and the lower end of the valve cover (2) has an upper connecting flange (21) that can be matched with the lower connecting flange (11). The upper connecting flange (21) of the valve cover (2) is fixedly connected to the lower connecting flange (11) of the valve body (1) by bolts (5). The lower connecting flange (11) and the upper connecting flange (21) are respectively provided with annular protrusions (3) on the sides facing each other. Two annular gaskets (4) overlapping each other are provided between the two annular protrusions (3). The inner rings of the two annular gaskets (4) are respectively continuously welded with the two annular protrusions (3) to form an inner sealing weld (6). The outer ring diameter of the annular gasket (4) is larger than the outer ring diameter of the annular protrusion (3) so that the outer ring edge of the annular gasket (4) protrudes from the outer ring edge of the annular protrusion (3). The outer ring edges of the two annular gaskets (4) are continuously welded to form an outer sealing weld (7).

2. A valve body cover connection structure according to claim 1, characterized in that: The annular gasket (4) is made of metal.

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