Double disc valve

Abstract

The utility model relates to the technical field of flat disc valves, in particular to a double flat disc valve, comprising a valve body with a valve cavity inside, the valve body being provided with a flow channel connected to the valve cavity, the valve body being provided with a main shaft, the main shaft being equipped with a swing arm, the swing arm being located in the valve cavity, the swing arm being provided with a valve plate matching the flow channel, the valve cavity being fixedly connected with a shaft sleeve, the shaft sleeve being sleeved on the main shaft, the main shaft being provided with shaft sleeves at both ends of the swing arm. When in use, shaft sleeves are fixedly connected at both ends of the swing arm in the valve cavity, a bushing is provided between the shaft sleeve and the main shaft, the bushing improves the wear resistance between the main shaft and the shaft sleeve, prevents the main shaft from wearing, ensures that the valve plate can be switched smoothly and without jamming, avoids the existing disc valve dust from accumulating in large quantities in the valve cavity or on the sealing surface, resulting in the valve plate switching not being smooth and easy to be jammed, and the problem of serious wear of the main shaft due to the ordinary operation of the disc valve.

Description

Technical Field

[0001] The utility model relates to the technical field of flat disc valves, in particular to a double flat disc valve. Background Art

[0002] Disc valves are mostly used for boiler blowdown, descaling, and treatment of rapidly coagulating materials. They are widely used in hard particles, corrosive or slagging media, and in frequent operation. At present, the main application places are: coal powder transportation, coal powder injection, ash discharge system, sewage, wastewater discharge system in power plants, etc.; pulp transportation and treatment system in papermaking industry; catalyst transportation system in chemical industry; slurry transportation system in cement manufacturing industry, etc. Dust will accumulate in large quantities in the valve cavity or sealing surface, resulting in the valve plate opening and closing not being smooth, and easy to get stuck, etc. Due to the ordinary operation of the disc valve, the main shaft will be seriously worn. At the same time, because the dust contains a large number of solid particles and the flow rate is high, it is easy to wash the valve plate and the valve seat sealing surface, which eventually leads to a decrease in sealing performance and affects the use. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the problem that dust in the existing disc valve will accumulate in large quantities in the valve cavity or the sealing surface, resulting in the valve plate opening and closing not being smooth and easy to get stuck, etc., and the main shaft will be seriously worn due to the ordinary operation of the disc valve, a double flat disc valve is now provided.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a double flat disc valve, including a valve body with a valve cavity inside, a flow channel connected to the valve cavity is arranged on the valve body, a main shaft is arranged on the valve body, a swing arm is installed on the main shaft, the swing arm is located in the valve cavity, a valve plate matched with the flow channel is arranged on the swing arm, a shaft sleeve is fixedly connected in the valve cavity, the shaft sleeve is sleeved on the main shaft, shaft sleeves are arranged at both ends of the main shaft located at the swing arm, and a bushing for preventing the main shaft from wearing is arranged between the shaft sleeve and the main shaft. Compared with the prior art, the present solution has shaft sleeves fixedly connected at both ends of the swing arm in the valve cavity, and a bushing is arranged between the shaft sleeve and the main shaft. The bushing improves the wear resistance between the main shaft and the shaft sleeve, prevents the main shaft from wearing, and ensures that the valve plate switches smoothly and without jamming.

[0005] In order to prevent large particles such as dust from entering between the main shaft and the sleeve, in some preferred embodiments, a gasket is provided on the main shaft, and the gasket is located between the sleeve and the swing arm. The gasket can effectively prevent large particles such as dust from entering between the main shaft sleeve, and prevent the main shaft from shaking and causing wear between the gasket and the main shaft.

[0006] To facilitate the positioning of the gasket, preferably in some embodiments, the shaft sleeve is provided with a placement groove, the placement groove matches the gasket, and the gasket is arranged in the placement groove. The gasket is arranged in the placement groove to quickly position the gasket and ensure that the axial positioning of the gasket is stable and reliable.

[0007] In order to ensure the sealing between the main shaft and the sleeve, in some preferred embodiments, a balancing seal ring is provided between the sleeve and the main shaft. By ensuring the sealing between the main shaft and the sleeve through the balancing seal ring, dust can be prevented from entering the main shaft, effectively solving the locking problem.

[0008] In order to facilitate the installation of the sleeve on the valve body, some preferred embodiments are that a limit shoulder is provided at one end of the sleeve, a notch matching the limit shoulder is provided on the valve body, and the limit shoulder is arranged in the notch. The limit shoulder cooperates with the notch to quickly position the sleeve on the valve body, which facilitates the installation of the sleeve and the fixing of the sleeve on the valve body.

[0009] In order to achieve a fixed connection between the shaft sleeve and the valve body, in some preferred embodiments, the shaft sleeve is fixedly mounted on the valve body by welding.

[0010] In order to prevent the medium in the valve body from leaking through the gap between the main shaft and the valve body, in some preferred embodiments, a stuffing chamber is provided between the valve body and the main shaft, and a V-shaped stuffing, a pressure cover and a pressure plate are sequentially arranged in the stuffing chamber along the axial direction of the main shaft, and the pressure plate is fixed to the valve body by bolts.

[0011] In order to facilitate the pre-tightening of the packing, in some preferred embodiments, a pre-tightening disc spring is provided between the pressure plate and the bolt.

[0012] In some preferred embodiments, a dust ring is provided between the pressure plate and the main shaft.

[0013] In order to prevent wear between the main shaft and the pressing plate, preferably in some embodiments, a sleeve is provided between the gland and the main shaft. The sleeve increases the wear resistance of the main shaft and avoids leakage caused by large wear between the main shaft and the pressing plate.

[0014] The beneficial effects of the utility model are as follows: when the double flat disc valve of the utility model is in use, shaft sleeves are fixedly connected at both ends of the swing arm in the valve cavity, and a bushing is arranged between the shaft sleeve and the main shaft. The bushing improves the wear resistance between the main shaft and the shaft sleeve, prevents the main shaft from being worn, ensures that the valve plate switches smoothly and without jamming, and avoids the problem that dust of the existing disc valve will accumulate in large quantities in the valve cavity or sealing surface, causing the valve plate to switch unsmoothly and easily get stuck, etc., and the problem of serious wear of the main shaft due to the ordinary operation of the disc valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a top view of the utility model;

[0018] Figure 3 yes Figure 2 Middle AA section view;

[0019] Figure 4 yes Figure 3 A partial enlarged view of B.

[0020] In the figure: 1. valve body, 2. valve chamber, 3. flow channel, 4. main shaft, 5. swing arm, 6. valve plate, 7. shaft sleeve, 8. bushing, 9. gasket, 10. placement groove, 11. limit shoulder, 12. notch, 13. packing chamber, 14. V-shaped packing, 15. gland, 16. pressure plate, 17. bolt, 18. preloaded disc spring, 19. dust ring, 20. sleeve, 21. balance seal ring. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below in conjunction with the embodiments:

[0022] The present invention is not limited to the following specific implementations. A person skilled in the art can implement the present invention in a variety of other specific implementations according to the content disclosed in the present invention, or any design structure and idea of ​​the present invention with simple changes or modifications shall fall within the protection scope of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0023] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0024] 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 an indirect connection 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 by specific circumstances.

[0025] like Figure 1-4 As shown, a double flat disc valve comprises a valve body 1 with a valve cavity 2 inside, a flow channel 3 connected with the valve cavity 2 is arranged on the valve body 1, an axial hole connected with the valve cavity 2 is opened on the valve body 1, a main shaft 4 is arranged on the valve body 1, one end of the main shaft 4 passes through the axial hole and is arranged in the valve cavity 2, a swing arm 5 is installed on the main shaft 4, the swing arm 5 is located in the valve cavity 2, a valve plate 6 matched with the flow channel 3 is arranged on the swing arm 5, a shaft sleeve 7 is fixedly connected in the valve cavity 2, the shaft sleeve 7 is sleeved on the main shaft 4, shaft sleeves 7 are arranged at both ends of the main shaft 4 located at the swing arm 5, the shaft sleeve 7 is coaxially arranged with the axial hole, a bushing 8 for preventing the main shaft 4 from wearing is arranged between the shaft sleeve 7 and the main shaft 4, in this embodiment, a cylinder is hinged on the valve body 1, and the protruding end of the cylinder is eccentrically hinged on the main shaft 4.

[0026] A gasket 9 is sleeved on the main shaft 4 , and the gasket 9 is located between the shaft sleeve 7 and the swing arm 5 . A placement groove 10 is opened on the shaft sleeve 7 , and the placement groove 10 matches the gasket 9 , and the gasket 9 is arranged in the placement groove 10 .

[0027] A balancing seal ring 21 is arranged between the sleeve 7 and the main shaft 4, a limiting shoulder 11 is arranged at one end of the sleeve 7, a notch 12 matching the limiting shoulder 11 is arranged on the valve body 1, the limiting shoulder 11 is arranged in the notch 12, and the sleeve 7 is fixedly mounted on the valve body 1 by welding.

[0028] A stuffing chamber 13 is arranged in the axial hole between the valve body 1 and the main shaft 4. A V-shaped stuffing 14, a pressure cover 15 and a pressure plate 16 are arranged in sequence in the stuffing chamber 13 along the axial direction of the main shaft 4. The pressure plate 16 is fixed to the valve body 1 by bolts 17. A preloaded disc spring 18 is arranged between the pressure plate 16 and the bolts 17. A dust ring 19 is arranged between the pressure plate 16 and the main shaft 4. A sleeve 20 is arranged between the pressure cover 15 and the main shaft 4.

[0029] When the double-plate disc valve is in use, the cylinder on the valve body 1 drives the main shaft 4 to rotate, and drives the valve plate 6 at one end of the rocker arm to swing around the main shaft 4, and the valve plate 6 opens or closes the flow channel 3 on the valve body 1;

[0030] When the medium flows, the medium located at the main shaft 4 and the sleeve 7 in the valve chamber 2 will be blocked by the gasket 9 and the balance seal ring 21 to prevent the medium from entering between the main shaft 4 and the sleeve 7. At the same time, the bushing 8 between the main shaft 4 and the sleeve 7 prevents wear between the main shaft 4 and the sleeve 7. Moreover, the medium will not leak out. The leakage of the medium first needs to pass through the sleeve 7 and the main shaft 4, and then leak out through the packing and the pressure plate 16. With the cooperation of multiple components, the leakage of the medium is greatly reduced. The sealing between the main shaft 4 and the shaft hole adopts a V-shaped packing 14 to prevent leakage. At the same time, it is pre-tightened with the bolt 17 and the pre-tightening disc spring 18, which can effectively prevent the bolt 17 from loosening during the operation process, resulting in leakage of the medium.

[0031] The above-mentioned ideal embodiments of the utility model are inspirations. Through the above-mentioned description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double flat disc valve, comprising a valve body (1) having a valve cavity (2) therein, the valve body (1) being provided with a flow channel (3) communicating with the valve cavity (2), the valve body (1) being provided with a main shaft (4), a swing arm (5) being mounted on the main shaft (4), the swing arm (5) being located in the valve cavity (2), the swing arm (5) being provided with a valve plate (6) cooperating with the flow channel (3), characterized in that: A shaft sleeve (7) is fixedly connected in the valve cavity (2), and the shaft sleeve (7) is sleeved on the main shaft (4). The shaft sleeves (7) are arranged at both ends of the main shaft (4) located on the swing arm (5), and a bushing (8) is arranged between the shaft sleeve (7) and the main shaft (4) to prevent the main shaft (4) from being worn.

2. The double flat disc valve according to claim 1, characterized in that: A gasket (9) is sleeved on the main shaft (4), and the gasket (9) is located between the shaft sleeve (7) and the swing arm (5).

3. The double flat disc valve according to claim 2, characterized in that: The shaft sleeve (7) is provided with a placement groove (10), the placement groove (10) matches the gasket (9), and the gasket (9) is arranged in the placement groove (10).

4. The double flat disc valve according to claim 1, characterized in that: A balancing seal ring (21) is provided between the shaft sleeve (7) and the main shaft (4).

5. The double flat disc valve according to claim 1, characterized in that: A limiting shoulder (11) is provided at one end of the shaft sleeve (7), a notch (12) matching the limiting shoulder (11) is provided on the valve body (1), and the limiting shoulder (11) is arranged in the notch (12).

6. The double flat disc valve according to claim 1 or 5, characterized in that: The shaft sleeve (7) is fixedly mounted on the valve body (1) by welding.

7. The double flat disc valve according to claim 1, characterized in that: A packing cavity (13) is provided between the valve body (1) and the main shaft (4), and a V-shaped packing (14), a pressure cover (15) and a pressure plate (16) are sequentially arranged in the packing cavity (13) along the axial direction of the main shaft (4), and the pressure plate (16) is fixed to the valve body (1) by means of bolts (17).

8. The double flat disc valve according to claim 7, characterized in that: A preload disc spring (18) is arranged between the pressure plate (16) and the bolt (17).

9. The double flat disc valve according to claim 8, characterized in that: A dust ring (19) is provided between the pressure plate (16) and the main shaft (4).

10. The double flat disc valve according to claim 9, characterized in that: A sleeve (20) is arranged between the gland (15) and the main shaft (4).

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