Vacuum-resistant tank bottom ball valve

Abstract

The utility model discloses a vacuum resistant tank bottom ball valve which comprises a valve body, a valve cover, a ball body and a valve rod, the valve cover is arranged on one side of the valve body, a medium cavity is arranged in the valve body, the ball body is arranged in the medium cavity, the valve rod is inserted into the valve body in the inclined direction and is connected with the ball body, and an upstream sealing assembly is arranged on the upstream side of the ball body. A downstream sealing assembly is arranged on the downstream side of the ball body, the upstream sealing assembly comprises a disc spring, an upper sealing ring, a pressing ring and an upper valve seat, an upper sealing face is arranged on the upper valve seat, the upper valve seat is in contact connection with the ball body through the upper sealing face, the pressing ring is arranged on one side of the upper valve seat, and the upper sealing ring is arranged between the pressing ring and the upper valve seat and is in contact sealing with the valve deck. The disc spring is arranged between the pressing ring and the valve cover, the disc spring is pressed towards the pressing ring in a compressed state, and the downstream sealing assembly is in contact sealing with the ball and the valve body. According to the utility model, the working condition requirement of a high-temperature medium can be met, and the requirement of vacuumizing in the tank can also be met.

Description

Technical Field

[0001] The utility model relates to a ball valve, in particular to a bottom ball valve of a tank for realizing vacuum sealing. Background Art

[0002] In industries such as chemical engineering, coatings, and light industry, metal tanks are commonly used for mixing materials and fermentation. To fully utilize the maximum value of the equipment, sometimes the same tank is used to ferment different materials. If different materials are used, it is necessary to clean first to ensure that there is no conflict between different materials. When cleaning this type of tank, a certain vacuum degree needs to be maintained inside the tank to be able to clean it more thoroughly. Currently, for this type of tank, a ball valve is usually installed at the bottom for sealing. The commonly used bottom ball valves of tanks are mostly floating ball valves, which are for outlet side sealing and basically cannot meet the requirement of vacuum pumping. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a vacuum-resistant bottom ball valve of a tank, which can not only meet the needs of high-temperature medium working conditions but also meet the needs of vacuum pumping inside the tank.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A vacuum-resistant bottom ball valve of a tank includes a valve body, a valve cover, a ball, and a valve stem. The valve cover is installed on one side of the valve body. A medium cavity is provided inside the valve body. The ball is installed in the medium cavity. The valve stem is inserted into the valve body obliquely and connected to the ball. An upstream sealing assembly is provided on the upstream side of the ball, and a downstream sealing assembly is provided on the downstream side of the ball. The upstream sealing assembly includes a disc spring, an upper sealing ring, a retaining ring, and an upper valve seat. The upper valve seat is provided with an upper sealing surface. The upper valve seat is in contact connection with the ball through the upper sealing surface. The retaining ring is provided on one side of the upper valve seat. The upper sealing ring is provided between the retaining ring and the upper valve seat and is in contact sealing with the valve cover. The disc spring is provided between the retaining ring and the valve cover. The disc spring is kept in a compressed state and presses against the retaining ring. The downstream sealing assembly is in contact sealing with the ball and the valve body.

[0006] As a further improvement, the upper sealing surface is an inclined surface and is made of hard alloy.

[0007] As a further improvement, the downstream sealing assembly includes a lower valve seat and a lower sealing ring. The lower valve seat is provided with a lower sealing surface. The lower valve seat is in contact connection with the ball through the lower sealing surface. One side of the lower sealing ring is connected to the lower valve seat, and the other side is connected to the valve body.

[0008] As a further improvement, the lower sealing surface is an inclined surface and is made of hard alloy.

[0009] As a further improvement, an inclined flat groove is provided on the valve body, and the valve stem is inserted and fixed in the flat groove, and an acute angle is formed between the central axis of the valve stem and the central axis of the valve body.

[0010] As a further improvement, a sealing ring and a sealing thrust pad are provided between the valve stem and the flat groove.

[0011] As a further improvement, the valve cover is locked and connected to the valve body by bolts.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The disc spring is used to apply a normal pressure, so that the sphere always maintains a tendency to press downward on the lower valve seat, and at the same time, the sealing on the upstream side and the downstream side of the sphere is realized, with a two-way sealing function, which is particularly suitable for cans with requirements for vacuum pumping conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic cross-sectional structure diagram of the utility model;

[0015] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0016] Figure 3 is Figure 1 an enlarged schematic view of part B in

[0017] Reference numerals:

[0018] Valve body 1, valve cover 2, sphere 3, valve stem 4, upstream sealing assembly 5, disc spring 51, upper sealing ring 52, retaining ring 53, upper valve seat 54, sealing surface 55, downstream sealing assembly 6, lower valve seat 61, lower sealing ring 62, lower sealing surface 63, sealing ring 7, sealing thrust pad 8, packing 9, pressing plate 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0020] In the description of the present invention, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is 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, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] As Figures 1-3 shown, a vacuum-resistant bottom ball valve for a tank includes a valve body 1, a valve cover 2, a ball 3, and a valve stem 4. The valve cover 2 is installed on one side of the valve body 1. A medium cavity is provided inside the valve body 1. The ball 3 is installed in the medium cavity. The valve stem 4 is inserted into the valve body 1 in an inclined direction and connected to the ball 3. An upstream sealing assembly 5 is provided on the upstream side of the ball 3, and a downstream sealing assembly 6 is provided on the downstream side of the ball 3. The upstream sealing assembly includes a disc spring 51, an upper sealing ring 52, a retaining ring 53, and an upper valve seat 54. An upper sealing surface 55 is provided on the upper valve seat 54. The upper valve seat 65 is in contact connection with the ball 3 through the upper sealing surface 55. The retaining ring 53 is provided on one side of the upper valve seat 54. The upper sealing ring 52 is provided between the retaining ring 53 and the upper valve seat 54 and is in contact sealing with the valve cover 2. The disc spring 51 is provided between the retaining ring 53 and the valve cover 54. The disc spring 51 is kept in a compressed state and presses against the retaining ring 53. The downstream sealing assembly 6 is in contact sealing with the ball 3 and the valve body 1. Since the disc spring always presses the retaining ring, the retaining ring presses the upper valve seat and the upper sealing ring to ensure the sealing performance. And the upper valve seat exerts a pressing force on the ball, causing the ball to press against the lower valve seat, thereby ensuring that the lower sealing ring also forms an effective seal.

[0023] After the retaining ring 53 comes into contact with and is assembled to the valve cover 2, a relatively sealed space is formed. This sealed space is annular and just fits the annular disc spring 51. After being installed, the disc spring with a calculated force value can provide sufficient pressure to the sealing ring to achieve sealing, and at the same time, it does not affect the contact between the retaining ring and the valve cover.

[0024] On the upper part of the valve stem 4, there are packing 9 and a pressing plate 10. The pressing plate 10 presses the packing 9, and the packing 9 and the pressing plate 10 together form a sealing structure.

[0025] The valve body 1 is provided with an inclined flat groove for installation. The valve stem 4 is inserted and fixed in the flat groove, and an acute angle is formed between the central axis of the valve stem 4 and the central axis of the valve body 1. Between the valve stem 4 and the flat groove, there are a sealing ring 7 and a sealing thrust washer 8. Through the inclined installation structure of the valve stem 4 and the valve body 1, after the valve is installed on the bottom of the tank, the driving component will not interfere with the bottom of the tank. The inner side of the valve stem is sealed by a sealing structure composed of packing and a pressing plate, so that the internal medium of the valve will not leak from the valve stem part. At the same time, in the vacuum working condition, the packing seals the atmospheric environment and does not allow air and the like to enter the valve cavity.

[0026] The upper sealing surface 55 is an inclined surface and is made of hard alloy.

[0027] The downstream sealing assembly 6 includes a lower valve seat 61 and a lower sealing ring 62. The lower valve seat 61 is provided with a lower sealing surface 63. The lower valve seat 61 is in contact connection with the sphere 3 through the lower sealing surface 63. One side of the lower sealing ring 62 is connected to the lower valve seat 61 and the other side is connected to the valve body 1. The lower sealing surface 63 is an inclined surface and is made of hard alloy. By using the downstream sealing assembly, the sealing on the outer circle side of the valve seat can be realized, so that the medium in the valve cavity will not leak. By making the upper sealing surface and the lower sealing surface of hard alloy, the hardness is increased, ensuring that the contact between the upper valve seat and the lower valve seat and the sphere has sufficient strength, can be wear-resistant and high-temperature resistant, and is not easily damaged.

[0028] Between the valve cover 2 and the valve body 1, they are locked by bolts and nuts. The upper valve seat, upper sealing ring, disc spring, retaining ring, lower valve seat and lower sealing ring are all installed in the medium cavity of the valve cover close to the flow channel.

[0029] After the valve is installed, the medium and pressure enter from the upstream side, and the lower valve seat of the valve is sealed. When there is a vacuum situation, the internal medium and pressure of the valve enter from the lower valve seat side, and the inside of the tank on the upstream side of the valve tends to be in a vacuum state without pressure. At this time, the upstream valve seat is sealed and the sealing performance is good.

[0030] It should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A vacuum-resistant bottom ball valve for a tank, comprising a valve body, a valve cover, a ball and a valve stem, characterized in that, The valve cover is installed on one side of the valve body. A medium cavity is provided inside the valve body. The sphere is installed in the medium cavity. The valve stem is inserted into the valve body obliquely and connected to the sphere. An upstream sealing assembly is provided on the upstream side of the sphere, and a downstream sealing assembly is provided on the downstream side of the sphere. The upstream sealing assembly includes a disc spring, an upper sealing ring, a retaining ring, and an upper valve seat. The upper valve seat is provided with an upper sealing surface, and the upper valve seat is in contact connection with the sphere through the upper sealing surface. The retaining ring is arranged on one side of the upper valve seat. The upper sealing ring is arranged between the retaining ring and the upper valve seat and is in contact sealing with the valve cover. The disc spring is arranged between the retaining ring and the valve cover, and the disc spring is kept in a compressed state and presses against the retaining ring. The downstream sealing assembly is in contact sealing with the sphere and the valve body.

2. The vacuum-resistant bottom ball valve according to claim 1, characterized in that, The upper sealing surface is an inclined surface and is made of cemented carbide.

3. The vacuum-resistant bottom ball valve according to claim 1, characterized in that, The downstream sealing assembly includes a lower valve seat and a lower sealing ring. The lower valve seat is provided with a lower sealing surface, and the lower valve seat is in contact connection with the sphere through the lower sealing surface. One side of the lower sealing ring is connected to the lower valve seat, and the other side is connected to the valve body.

4. The vacuum-resistant bottom ball valve according to claim 3, characterized in that The lower sealing surface is an inclined surface and is made of cemented carbide.

5. The vacuum-resistant bottom ball valve according to claim 1, characterized in that, The valve body is provided with an obliquely installed flat groove, and the valve stem is inserted and fixed in the flat groove. An acute angle is formed between the central axis of the valve stem and the central axis of the valve body.

6. The vacuum-resistant bottom ball valve according to claim 1, characterized in that, A sealing ring and a sealing thrust pad are arranged between the valve stem and the flat groove.

7. The vacuum-resistant bottom ball valve according to claim 1, characterized in that, The valve cover is tightly connected to the valve body by bolts.

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