Flash freeze stop valve

Abstract

The utility model discloses a kind of quick thawing stop valves, including valve body, valve cover, valve clapper and the valve stem connected with valve clapper, valve stem is screwed on valve cover, sealing pair is equipped between valve clapper and valve body, valve gate opening and closing hand wheel is fixed with in the valve stem top end by nut, blind hole is equipped on the valve stem, the blind hole is coaxially arranged with valve stem, the ratio d:D of the diameter d of blind hole and valve stem diameter D is 0.4:1~0.6:1, the ratio L:D of the distance L from the bottom of blind hole to the bottom of valve stem and valve stem diameter D is 0.8~1.2, electric heating rod or screwing blind hole plug can be inserted on the blind hole, the lower end of the electric heating rod is close to the bottom of blind hole, electric heating assembly can be provided on the outside of the valve body. Quick thawing stop valve using the utility model can make frozen stop valve thawing opening and closing in time, and thawing device does not need to be set on valve all the year round.

Description

Technical Field

[0001] This utility model relates to a valve, and more particularly to a shut-off valve that is prone to freezing. Background Technology

[0002] A gate valve is a type of valve that uses a valve disc as its opening and closing element. Its sealing pair is located between the valve disc and the internal passage of the valve body. The valve disc opens and closes by rotating a valve stem that is screwed onto a valve cover mounted on the valve body. Gate valves are widely used, and in cold seasons, freezing due to low temperatures is common. Once frozen, they are difficult to thaw immediately. To prevent freezing, it is common practice to add insulation to the outside of the valve. This increases operating costs and maintenance workload. Furthermore, since thawing of valve parts usually starts from the outside, the insulation device will make the thawing process even more difficult if it fails. The easily frozen parts of a gate valve are typically at the connection between the valve stem and the valve cover, and between the valve disc and the valve body's sealing pair. These parts directly affect the valve's opening and closing, and their thawing process often lags behind the thawing of the fluid inside the pipeline. Utility Model Content

[0003] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a quick-thawing shut-off valve, which can enable the frozen shut-off valve to thaw and open in time, and the thawing device does not need to be installed on the valve all year round.

[0004] To solve the above-mentioned technical problems, the present invention provides an X comprising a valve body, a valve cover, a valve disc, and a valve stem connected to the valve disc. The valve stem is screwed onto the valve cover. A sealing pair is provided between the valve disc and the valve body. A valve opening and closing handwheel is fixedly connected to the top of the valve stem by a nut. A blind hole is provided on the valve stem, which is coaxially arranged with the valve stem. An electric heating rod or a blind hole plug can be inserted into the blind hole. The lower end of the electric heating rod is close to the bottom of the blind hole. An electric heating component can be provided on the outside of the valve body.

[0005] After adopting the above technical solution, when it is necessary to thaw the gate valve or prepare to prevent the gate valve from freezing suddenly due to cold air, an electric heating rod can be inserted into the blind hole in the valve stem. When the heating rod is energized, it generates heat, which pre-raises the temperature of the valve stem and the connected valve disc. This ensures that the sealing surface between the valve disc and the valve body, and the connection between the valve stem and the valve cover, remain above the freezing temperature of the fluid inside the valve, preventing the gate valve from freezing. Alternatively, the heating rod can raise the temperature of the frozen sealing surface between the valve disc and the valve body, and the connection between the valve stem and the valve cover, to above the freezing point of the fluid inside the valve, thus thawing the corresponding frozen parts. This allows the valve stem to rotate and drive the valve disc to open and close. Because the thawing parts are directly heated… The heating element is located at the part of the valve body that is affected by freezing, allowing the relevant parts to thaw in time and the gate valve to return to its working state immediately. In seasons when freezing is not easy, the blind hole on the valve stem can be sealed with a blind hole plug, eliminating the need to keep the heating element inside the valve stem. One heating element can be used on various gate valves of the same type, saving on the manufacturing cost of the gate valve. When it is necessary to thaw the gate valve or to prepare for the gate valve to freeze suddenly due to cold air, an electric heating element can be added to the outside of the valve body. The heat generated by the electric heating element after being powered on can raise the temperature of the valve body to prevent the fluid inside the valve body from freezing or to thaw the fluid inside the valve body by heating the valve body, further accelerating the thawing process of the gate valve. Moreover, the electric heating element does not need to be installed on the valve body all year round.

[0006] In a preferred embodiment of this invention, the ratio of the diameter d of the blind hole to the diameter D of the valve stem, d:D, is 0.4:1 to 0.6:1, and the ratio of the distance L from the bottom of the blind hole to the bottom of the valve stem to the diameter D of the valve stem, L:D, is 0.8 to 1.2. This embodiment ensures that the valve stem meets the rigidity and strength requirements for the force applied during the opening and closing process of the shut-off valve, and also ensures that the distance between the heating rod and the valve disc is as short as possible, allowing the heat from the heating rod to be transferred to the valve disc more quickly.

[0007] In another preferred embodiment of this invention, the electric heating assembly includes a heating tube encapsulated within the assembly. One side of the heating assembly is a heat-conducting side, and the remaining sides are heat-insulating sides. In this embodiment, the electric heating assembly generates heat through the heating tube, and the heat is transferred outwards through the heat-conducting side, resulting in high heating efficiency.

[0008] In another preferred embodiment of this utility model, the heating element is installed at the bottom of the valve body, and a mounting surface for the heating element is provided at the bottom of the valve body, with the heat-conducting side of the heating element in contact with the mounting surface. In this embodiment, since the bottom of the valve body is where the liquid inside the valve accumulates, installing the heating element at the bottom of the valve body allows for direct heating of the frozen fluid inside the valve, resulting in high efficiency.

[0009] In a further preferred embodiment of this invention, the top of the heating rod is provided with a cover, which is fastened to the thread on the top of the valve stem. This embodiment ensures that the heating rod is securely installed during use.

[0010] In another preferred embodiment of this invention, the two electrode posts of the heating rod are disposed at the top of the heating rod. This embodiment facilitates the use of the heating rod without affecting the operation of the valve opening and closing handwheel.

[0011] In another preferred embodiment of this utility model, the heating rod is a dry-burning type heating rod. This embodiment avoids damage caused by poor heat transfer due to unavoidable poor contact between the heating rod and the wall of the blind hole during use, thus extending the service life of the heating rod.

[0012] In a further preferred embodiment of this invention, the blind hole plug is a cap-shaped nut that is screwed onto the thread at the top of the valve stem. This embodiment provides a simple blind hole plug structure that effectively seals the blind hole on the valve stem.

[0013] In another further preferred embodiment of this utility model, the blind hole plug includes a cap-shaped nut with a blind hole insert rod disposed within the threaded hole of the cap-shaped nut. The blind hole insert rod is inserted into the blind hole of the valve stem, with the diameter of the blind hole insert rod corresponding to the diameter of the blind hole and the length of the blind hole insert rod corresponding to the depth of the blind hole. Using this embodiment, the blind hole plug with the blind hole insert rod not only effectively seals the blind hole but also fills it as much as possible, further ensuring the strength and rigidity of the valve stem. Attached Figure Description

[0014] The quick-thawing shut-off valve of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of a specific embodiment of the quick-thawing shut-off valve of this utility model;

[0016] Figure 2 yes Figure 1 A schematic diagram of the heating rod in the structure shown;

[0017] Figure 3 It is installed at Figure 1 A schematic diagram of one embodiment of the blind hole plug at the top of the blind hole in the structure shown.

[0018] Figure 4 It is installed at Figure 1 A schematic diagram of another embodiment of the blind hole plug at the top of the blind hole in the structure shown.

[0019] In the diagram: 1-Heating component, 2-Heating component mounting surface, 3-Valve body, 4-Sealing pair, 5-Valve disc, 6-Blind hole, 7-Valve stem, 8-Valve cover, 9-Valve opening / closing handwheel, 10-Heating rod, 11-Cover, 12-Electrode post, 13-Blind hole plug, 14-Cap nut, 15-Blind hole insert rod. Detailed Implementation

[0020] exist Figure 1 In the quick-freeze shut-off valve shown, the valve cover 8 is sealed and installed at the upper opening of the valve body 3. A valve stem 7 is sealed and inserted into the valve cover 8, and the valve stem 7 is screwed to the upper end of the valve cover 8. A valve opening and closing handwheel 9 is installed on the upper part of the valve stem 7 through a connecting tenon. The valve opening and closing handwheel 9 is fixed to the valve stem 7 by a nut through the external thread on the top of the valve stem 7. A valve disc 5 is installed at the lower end of the valve stem 7. A valve disc sealing ring is embedded on the outer circumference of the lower end face of the valve disc 5. A valve body sealing ring is embedded in the fluid passage of the inner cavity of the valve body 3. The upper end face of the valve body sealing ring can correspond and fit with the lower end face of the valve disc sealing ring. In this way, a sealing pair 4 is formed between the valve disc 5 and the valve body 3 through the valve body sealing ring and the valve disc sealing ring. Rotating the valve opening and closing handwheel 9 can rotate and raise the valve stem 7, thereby driving the valve disc 5 and the valve disc sealing ring on it to move up and down to open and close the shut-off valve.

[0021] A blind hole 6 is provided on the valve stem 7, which is coaxially arranged with the valve stem 7. The ratio of the diameter d of the blind hole 6 to the diameter D of the valve stem 7 is d:D, which is 0.4:1 to 0.6:1. The ratio of the distance L from the bottom of the blind hole 6 to the bottom of the valve stem 7 to the diameter D of the valve stem 7 is L:D, which is 0.8:1 to 1.2:1. When antifreeze or thawing is needed, such as during a cold snap, an electric heating rod 10 can be inserted into the blind hole 6. The lower end of the electric heating rod 10 is close to the bottom of the blind hole 6. The electric heating rod 10 is preferably a conventional dry-burning type electric heating rod. See [reference needed]. Figure 2 A cover 11 is provided on the top of the heating rod 10. The cover 11 is fastened to the external thread on the top of the valve stem 7. Of course, the cover 11 can also be configured to have a threaded hole and be screwed to the external thread on the top of the valve stem 7. The two electrode posts 12 of the heating rod 10 are provided on the top of the heating rod 10. The heating rod 10 can be heated by plugging in a power source through the electrode posts 12. The heat is transferred to the connection between the valve stem 7 and the valve cover 8 through the valve stem 7 and to the sealing pair 4 through the valve disc 5, so that the antifreeze or defrosting effect can be obtained conveniently and in a timely manner.

[0022] An electric heating element 1 can be installed on the outside of the valve body 3 to achieve a better and faster defrosting effect. The electric heating element 1 can adopt a conventional technical structure, including an electric heating tube (not shown in the figure), which is encapsulated inside the electric heating element 1. One side of the electric heating element 1 is the heat-conducting side, and the other side is the heat-insulating side. An electric heating element mounting surface 2 is provided at the bottom of the valve body 3, and the heat-conducting side of the electric heating element 1 is in contact with the electric heating element mounting surface 2. In this way, the electric heating element 1 is installed at the bottom of the valve body 3. When the electric heating element 1 is energized, the valve body 3 will be heated to achieve the purpose of antifreeze or defrosting. Of course, the electric heating element 1 can also be installed on the side of the valve body 3 by providing the electric heating element mounting surface 2. The defrosting effect will be faster and better.

[0023] During periods when antifreeze and thawing are not required, both the heating rod 10 and the heating element 1 can be disassembled and stored, eliminating the need for year-round installation on the valve stem 7 or valve body 3. After the heating rod 10 is removed from the valve stem 7, a blind hole plug 13 can be screwed onto the blind hole 6 for fixation, see [link to documentation]. Figure 3 The blind hole plug 13 can simply be a cap-shaped nut that is screwed onto the external thread at the top of the valve stem 7, thereby sealing and protecting the blind hole 6. Figure 4 Another preferred embodiment of the blind hole plug 13 is shown. The blind hole plug 13 includes a cap-shaped nut 14, in which a blind hole insert 15 is provided. The diameter of the blind hole insert 15 corresponds to the diameter of the blind hole 6, and the length of the blind hole insert 15 corresponds to the depth of the blind hole 6. When the cap-shaped nut 14 is screwed onto the upper external thread of the valve stem 7, the blind hole insert 15 is inserted into the blind hole 6 of the valve stem 7. In this way, the blind hole plug 13 can not only effectively seal the blind hole 6, but also fill the blind hole 6 as completely as possible, further ensuring the strength and rigidity of the valve stem 7.

[0024] The above are only some preferred embodiments of this utility model, but this utility model is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of this utility model should be considered to fall within the protection scope of this utility model.

Claims

1. A quick-freezing shut-off valve, comprising a valve body (3), a valve cover (8), a valve disc (5), and a valve stem (7) connected to the valve disc (5), wherein the valve stem (7) is screwed onto the valve cover (8), a sealing pair (4) is provided between the valve disc (5) and the valve body (3), and a valve opening / closing handwheel (9) is fixedly connected to the top of the valve stem (7) by a nut, characterized in that: A blind hole (6) is provided on the valve stem (7). The blind hole (6) is coaxially arranged with the valve stem (7). A heating rod (10) or a blind hole plug (13) can be inserted into the blind hole (6). The lower end of the heating rod (10) is close to the bottom of the blind hole (6). A heating assembly (1) can be provided on the outside of the valve body (3).

2. The quick-thawing shut-off valve according to claim 1, characterized in that: The ratio of the diameter d of the blind hole (6) to the diameter D of the valve stem (7) is d:D = 0.4:1 to 0.6:1, and the ratio of the distance L from the bottom of the blind hole (6) to the bottom of the valve stem (7) to the diameter D of the valve stem (7) is L:D = 0.8:1 to 1.2:

1.

3. The quick-thawing shut-off valve according to claim 1, characterized in that: The electric heating assembly (1) includes an electric heating tube, which is encapsulated inside the electric heating assembly (1). One side of the electric heating assembly (1) is a heat-conducting side, and the other side of the electric heating assembly (1) is a heat-insulating side.

4. The quick-thawing shut-off valve according to claim 1 or 3, characterized in that: The electric heating component (1) is installed at the bottom of the valve body (3), and an electric heating component mounting surface (2) is provided at the bottom of the valve body (3). The heat-conducting side of the electric heating component (1) is in contact with the electric heating component mounting surface (2).

5. The quick-thawing shut-off valve according to claim 1, characterized in that: The heating rod (10) is provided with a cover (11) on top, and the cover (11) is fastened to the thread on the top of the valve stem (7).

6. The quick-thawing shut-off valve according to claim 1 or 5, characterized in that: The two electrode posts (12) of the heating rod (10) are disposed at the top of the heating rod (10).

7. The quick-thawing shut-off valve according to claim 1, characterized in that: The heating rod (10) is a dry-burning type heating rod.

8. The quick-thawing shut-off valve according to claim 1, characterized in that: The blind hole plug (13) is a cap-shaped nut that is screwed onto the thread at the top of the valve stem (7).

9. The quick-thawing shut-off valve according to claim 1, characterized in that: The blind hole plug (13) includes a cap-shaped nut (14) with a blind hole insert (15) in the threaded hole of the cap-shaped nut (14). The blind hole insert (15) is inserted into the blind hole (6) of the valve stem (7). The diameter of the blind hole insert (15) corresponds to the diameter of the blind hole (6), and the length of the blind hole insert (15) corresponds to the depth of the blind hole (6).

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