A sealed connection structure of an empty can valve

Abstract

The utility model discloses a kind of empty tank valve sealing connection structure. Empty tank valve sealing connection structure includes: with the connecting portion of fixed connection of tank body, valve and the sealing assembly being set between the connecting portion and the valve, the connecting portion is the flange sleeve of tapered inner groove being opened;The sealing assembly includes the inner wedge ring and outer wedge ring being housed in the tapered inner groove;Screw bolt group is set between the valve and the flange sleeve. The empty tank valve sealing connection structure provided by the utility model is by setting flange sleeve, sealing assembly consisting of inner wedge ring and outer wedge ring, multiple screw bolts. Valve is connected with flange sleeve using multiple screw bolts, in empty tank, especially in the case of greater negative pressure, inner wedge ring and outer wedge ring produce radial expansion and / or shrinkage, using the "self-tightening" force provided by external atmospheric pressure, enhance sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to a sealing connection structure for an empty tank valve. Background Technology

[0002] "Empty tank" is not a specific type of tank, but rather describes a working state. It refers to a tank whose internal medium has been emptied, but which may still contain hazardous substances or require a specific environmental condition. For example, in the food and pharmaceutical industries, fermentation tanks and mixing tanks, after completing a production cycle, need to be emptied and thoroughly cleaned and sterilized (CIP / SIP). At this point, the tank is in an "empty" state, ready for the next use. In this situation, it is necessary to prevent external air, moisture, and impurities from entering the tank to prevent contamination. Traditional seals between valves and the tank rely on internal system pressure (such as medium pressure) to push gaskets (such as spiral wound gaskets) into place. However, in an empty tank state, this "external tightening" effect disappears, resulting in a poorer seal.

[0003] Therefore, it is necessary to provide a sealing connection structure for empty tank valves to solve the above-mentioned technical problems. Utility Model Content

[0004] In view of the above situation and to overcome the defects of the existing technology, this utility model provides an empty tank valve sealing connection structure that can improve the sealing effect when the tank is empty.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] The empty tank valve sealing connection structure includes: a connecting part fixedly connected to the tank body, a valve, and a sealing assembly disposed between the connecting part and the valve. The connecting part is a flange sleeve with a conical inner groove. The sealing assembly includes an inner wedge ring and an outer wedge ring housed in the conical inner groove, which are fitted together by matching inclined surfaces. A bolt group is provided between the valve and the flange sleeve. After the bolt group is tightened, when the internal pressure of the tank body is lower than the external ambient pressure, the inner and outer wedge rings undergo radial deformation under the guidance of the conical inner groove, respectively pressing tightly against the neck of the valve and the flange sleeve to form a more effective seal.

[0007] Preferably, the cone angle of the conical inner groove is 15° to 30°.

[0008] Preferably, a guide cone surface is provided on the outer side of the conical inner groove, and the outer side of the outer wedge ring is in contact with the guide cone surface.

[0009] Preferably, the inner wedge ring has a first flexible seal embedded on the side facing the valve neck.

[0010] Preferably, the first flexible seal is a lip seal or an O-ring, and its material is flexible graphite or perfluoroether rubber.

[0011] Preferably, a second flexible seal is embedded on the side of the outer wedge-shaped ring facing the bottom or sidewall of the conical inner groove.

[0012] Preferably, the valve is a ball valve, gate valve, or globe valve.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] (1) This utility model uses a flange sleeve, a sealing assembly consisting of an inner wedge ring and an outer wedge ring, and multiple bolts. The valve is connected to the flange sleeve by multiple bolts. In an empty tank, especially under high negative pressure, the inner and outer wedge rings undergo radial deformation, and the sealing effect is enhanced by the "self-tightening" force provided by the external atmospheric pressure.

[0015] (2) By providing a guide cone surface on the outside of the conical inner groove, this utility model can facilitate the installation of the outer wedge ring;

[0016] (3) By setting a first flexible sealing element and a second flexible sealing element, this utility model can further improve the reliability and safety of the seal;

[0017] (4) By setting the valve to be a ball valve, gate valve or stop valve, this utility model can be adapted to different valves and improve the applicability of this structure. Attached Figure Description

[0018] Figure 1 A schematic diagram of the sealing connection structure for the empty tank valve provided by this utility model;

[0019] Figure 2 for Figure 1 A partial cross-sectional view of the valve sealing connection structure of the empty tank shown.

[0020] Figure 3 This is a structural schematic diagram of the flange sleeve;

[0021] Figure 4 This is a schematic diagram of the valve structure;

[0022] Figure 5 for Figure 1 The diagram shows the installation of the valve sealing connection structure for the empty tank.

[0023] The corresponding names of the attached figures are: 1-flange sleeve, 2-valve, 3-inner wedge ring, 4-outer wedge ring, 5-tank body, 11-conical inner groove, 21-neck, 22-flange, 31-first flexible seal, 41-second flexible seal, 111-guide cone surface. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0025] Example 1:

[0026] like Figure 1-5 As shown, the empty tank valve sealing connection structure provided by this utility model includes: a connecting part welded and fixedly connected to the tank body 5, a valve 2, and a sealing assembly disposed between the connecting part and the valve 2. The connecting part is a flange sleeve 1 with a conical inner groove 11. The cone angle of the conical inner groove 11 can be selected from 15-30 degrees. The figure is only an example and does not represent its actual cone angle. The sealing assembly includes an inner wedge ring 3 and an outer wedge ring 4. The mating surfaces of the inner wedge ring 3 and the outer wedge ring 4 are smooth surfaces. The two are pressed together to form a sealed whole. The inner wedge ring 3 and the outer wedge ring 4 are placed in the conical inner groove 11. A bolt group consisting of multiple bolts is installed between the flange sleeve 1 and the valve 2 to connect and fix the two together. When the bolts are tightened, when the internal pressure of the tank body 5 is much lower than the external environmental pressure, atmospheric pressure will act on the end faces of the valve 2 and the inner wedge ring 3, generating an additional axial force. This force pushes the entire sealing assembly deeper into the conical inner groove 11. According to the wedge principle, this movement is converted into a stronger radial sealing force, achieving a self-tightening effect. This makes the seal more reliable under empty tank conditions. Specifically, the inner wedge ring 3 and the outer wedge ring 4 undergo radial deformation (expansion and / or contraction) under the guidance of the conical inner groove 11, thereby pressing the neck 21 of the flange sleeve 1 and the valve 2 respectively, forming a radial seal. The sealing force is related to the pressure difference between the inside and outside of the tank. This structure enables the tank 5 to seal using the "self-tightening" force provided by the external atmospheric pressure when the tank is empty (negative pressure). The greater the pressure difference between the inside and outside of the tank 5, the greater the "self-tightening" force provided by the external air, and the better the sealing effect.

[0027] The system consists of a flange sleeve 1, a sealing assembly composed of an inner wedge ring 3 and an outer wedge ring 4, and multiple bolts. The valve 2 is connected to the flange sleeve 1 using these bolts. In an empty tank, especially under high negative pressure, the inner wedge ring 3 and the outer wedge ring 4 undergo radial deformation, utilizing the "self-tightening" force provided by external atmospheric pressure to enhance the sealing effect.

[0028] Example 2:

[0029] like Figure 2-3 As shown, a guide cone surface 111 is provided on the outer side of the conical inner groove 11, and the outer surface of the outer wedge ring 4 is attached to the guide cone surface 111. During installation, the open conical inner groove 11 facilitates the installation of the outer wedge ring 4.

[0030] By providing a guide cone surface 111 on the outside of the conical inner groove 11, the installation of the outer wedge ring 4 can be facilitated.

[0031] Example 3:

[0032] like Figure 2 As shown, the inner wedge ring 3 has an annular groove on the side facing the neck 21. A first flexible seal 31 is embedded in this groove. This first flexible seal 31 is preferably a lip seal ring made of flexible graphite tape, with its lip facing the inside of the tank. Alternatively, an O-ring made of perfluoroelastomer rubber (FFKM) can be used to meet the requirements for chemical corrosion resistance and high temperature resistance. When a pre-tightening force is applied during installation, the first flexible seal 31 first undergoes elastic deformation, filling the tiny gap between the inner wedge ring 3 and the neck 21, providing a soft sealing barrier. This barrier, together with the main seal formed by the metal-to-metal contact of the inner wedge ring 3, constitutes a dual sealing system, greatly improving the reliability and safety of the seal.

[0033] By embedding and installing the first flexible seal 31 on the inner wedge ring 3, the reliability and safety of the seal can be improved.

[0034] Example 4:

[0035] like Figure 2 As shown, the outer wedge-shaped ring 4 is embedded in the side facing the bottom of the conical inner groove 11, and the second flexible seal 41 is made of the same material as the first flexible seal 31. When a pre-tightening force is applied during installation, the second flexible seal 41 first undergoes elastic deformation, filling the tiny gap between the outer wedge-shaped ring 4 and the conical inner groove 11, providing a soft sealing barrier. It functions similarly to the first flexible seal 31, improving the reliability and safety of the seal. It is worth noting that the second flexible seal 41 can also be installed on the side facing the conical surface 111, with the same effect.

[0036] By embedding and installing a second flexible seal 41 on the outer wedge ring 4, the reliability and safety of the seal can be improved.

[0037] Example 5:

[0038] Valve 2 is a ball valve, gate valve, or globe valve. The neck 21 is welded and fixed to the flange 22. The neck 21 is part of the valve 2 or a separate connecting pipe. If the neck 21 is a connecting pipe, the connecting pipe is welded and sealed to one end of the valve 2. This structural design can be adapted to different types of valves 2.

[0039] By setting valve 2 to be a ball valve, gate valve, or globe valve, it can be adapted to different valves, thus improving the applicability of this structure.

[0040] Working principle: During use, when the bolts are tightened and the tank (5) is under negative pressure, the external atmospheric pressure acts on the end face of the valve (2) and the inner wedge ring (3), generating an additional axial force that pushes the sealing assembly deeper into the conical inner groove (11). Based on the wedge principle, this axial movement is converted into a stronger radial sealing force, causing the inner wedge ring (3) and the outer wedge ring (4) to press tightly against the neck (21) of the valve 2 and the flange sleeve (1) respectively, forming a self-tightening seal. This sealing force increases with the increase of the pressure difference between the inside and outside of the tank, enabling the structure to achieve a reliable sealing effect of becoming tighter under negative pressure conditions in an empty tank.

Claims

1. A sealing connection structure for an empty tank valve, comprising a connecting part fixedly connected to a tank body (5), a valve (2), and a sealing assembly disposed between the connecting part and the valve (2), characterized in that: The connecting part is a flange sleeve (1) with a tapered inner groove (11); The sealing assembly includes an inner wedge ring (3) and an outer wedge ring (4) housed in the conical inner groove (11); A bolt group is provided between the valve (2) and the flange sleeve (1).

2. The sealing connection structure for an empty tank valve according to claim 1, characterized in that, The cone angle of the conical inner groove (11) is 15° to 30°.

3. The sealing connection structure for an empty tank valve according to claim 1, characterized in that, The outer side of the conical inner groove (11) is provided with a guide cone surface (111), and the outer side of the outer wedge ring (4) is in contact with the guide cone surface (111).

4. The sealing connection structure for an empty tank valve according to claim 1, characterized in that, A first flexible seal (31) is installed on one side of the inner wedge ring (3).

5. The sealing connection structure for an empty tank valve according to claim 4, characterized in that, The first flexible seal (31) is a lip seal or an O-ring, and its material is flexible graphite or perfluoroether rubber.

6. The sealing connection structure for an empty tank valve according to claim 1, characterized in that, A second flexible seal (41) is installed on one side of the outer wedge ring (4).

7. The sealing connection structure for an empty tank valve according to claim 1, characterized in that, The valve (2) is a ball valve, gate valve, or stop valve.

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