Gate valve suitable for ultralow-temperature environment

Abstract

The utility model provides a gate valve suitable for an ultralow-temperature environment, which comprises a valve body, a long-neck valve cover is mounted on the valve body, a valve rod penetrates through the long-neck valve cover, and the bottom end of the valve rod extends into the valve body; a valve seat is installed in the valve body, and the bottom end of the valve rod is connected with a gate plate which is matched with the valve seat in a pressing mode. An upper sealing device is arranged between the upper end of the long-neck valve cover and the valve rod; a lower sealing device is arranged between the lower end of the long-neck valve cover and the valve rod; the water dripping disc is fixedly connected with the outer circle of the long-neck valve cover, the water dripping disc is of a downwards-inclined umbrella-shaped structure, and a spiral groove is formed in the upper surface of the water dripping disc. The long-neck valve cover and the valve rod are both of a split structure, so that the machining and assembling precision is high; meanwhile, installation of the drip tray is facilitated, the drip tray inclines downwards, and the spiral groove is formed in the upper surface of the drip tray, so that condensate water can flow along a certain route track, and centralized collection and treatment are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-temperature valves, and in particular relates to a gate valve suitable for ultra-low temperature environments. Background Art

[0002] For valves used in ultra-low temperature media, it is necessary to prevent the low temperature media from spreading upward. In order to keep the temperature of the sealing packing part above zero degrees and prevent ice and frost, an extended valve stem is usually used. At the same time, in order to ensure the stability of the long-necked valve, a drip tray is installed on the valve to prevent the valve components from producing condensed water under low temperature conditions.

[0003] The existing ultra-low temperature gate valve has the following defects during its use: 1. The long-necked valve cover and the valve stem are respectively made of an integrally formed structure, which is difficult to process. At the same time, the matching accuracy between the two is not high, and the installation is inconvenient; 2. The drip tray is made of two semicircular structures mounted on the long-necked valve cover, and the end faces of the two semicircular drip plates close to each other are detachably fixed. During the installation process of the drip tray and the long-necked valve cover, due to the error in processing accuracy, a gap is caused between the mounting surfaces, affecting the overall performance of the drip tray; 3. The upper surface of the existing drip tray is a smooth plane, and condensed water flows arbitrarily, causing the operating floor to be slippery, posing a safety hazard; technical personnel in this field urgently need to solve the above technical problems. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the utility model provides a gate valve suitable for ultra-low temperature environments, which has a condensate drainage function and a good sealing effect.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A gate valve suitable for ultra-low temperature environment, comprising:

[0007] A valve body, a long-necked valve cover is installed on the valve body, a valve stem is passed through the long-necked valve cover, the bottom end of the valve stem extends into the valve body, a valve stem nut is installed on the top end of the valve stem, and a valve stem rotating device is provided on the valve stem nut;

[0008] A valve seat is installed in the valve body, and a gate plate which is tightly fitted with the valve seat is connected to the bottom end of the valve stem;

[0009] An upper sealing device is provided between the upper end of the long-necked valve cover and the valve stem;

[0010] A lower sealing device is provided between the lower end of the long-necked valve cover and the valve stem;

[0011] Also includes a drip tray.

[0012] The drip tray is fixedly connected to the outer circle of the long-necked valve cover, and the drip tray is in an umbrella-shaped structure inclined downward, and a spiral groove is provided on the upper surface of the drip tray.

[0013] In a preferred embodiment of the utility model, an inner hole matching the outer circle of the long-neck valve cover is opened in the middle of the drip tray, and the drip tray is sleeved on the long-neck valve cover and fixed to the long-neck valve cover by welding.

[0014] In a preferred embodiment of the present invention, the long-necked valve cover comprises an upper cover body and a lower cover body which are disconnected from the neck thereof, and the upper cover body and the lower cover body are fixed by welding.

[0015] In a preferred embodiment of the present invention, one end of the spiral groove starts at the edge of the inner hole of the drip tray, and the other end of the spiral groove ends at the outer edge of the drip tray. The cross section of the spiral groove is configured as an arc-shaped groove.

[0016] In a preferred example of the utility model, the upper sealing device includes: packing, a packing sleeve and a packing pressure plate. The top of the upper cover body is provided with a packing groove, the packing is arranged in the packing groove, the top of the packing is provided with a packing sleeve, the top of the packing is provided with a packing pressure plate, the packing pressure plate is fastened to the upper cover body by bolts, and the valve stem passes through the packing groove, the packing, the packing sleeve and the packing pressure plate in sequence to connect the valve stem nut.

[0017] In a preferred embodiment of the present invention, the lower sealing device comprises: a sealing ring and a sealing pressure plate, a sealing groove is provided at the bottom of the inner cavity where the lower cover body contacts the valve stem, the sealing ring is provided in the sealing groove and is locked and fixed by the sealing pressure plate;

[0018] In a preferred embodiment of the present invention, the valve stem includes: an upper rod body and a lower rod body, the diameter of the upper rod body is smaller than the diameter of the lower rod body, the upper rod body is screwed in the lower rod body, a gate plate is inserted into the bottom end of the lower rod body, the upper rod body is slidably connected to the upper sealing device, and the lower rod body is slidably connected to the lower sealing device.

[0019] Beneficial effects: The utility model is a gate valve suitable for ultra-low temperature environment, the drip tray is integrally formed and fixedly connected with the outer circle of the long-necked valve cover, the drip tray is in an umbrella-shaped structure inclined downward, and a spiral groove is provided on the upper surface of the drip tray, which helps the condensed water on the drip tray to flow along a certain route trajectory, which is convenient for centralized collection and treatment;

[0020] The split long-neck bonnet is used to match the installation of the drip tray. At the same time, the valve stem also adopts a split structure. The long-neck bonnet and the valve stem can be processed according to the matching accuracy of each part, which reduces the difficulty of overall processing, saves processing time, and enhances the sealing performance of the gate valve;

[0021] An upper sealing device and a lower sealing device are respectively arranged at the upper end and the lower end of the valve stem, with double sealing. The lower sealing device has a certain cold insulation and dirt blocking effect, which improves the sealing performance of the upper sealing device. The design of the double sealing device can effectively prevent medium leakage and improve the reliability and safety of the gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A half-section view of a gate valve suitable for ultra-low temperature environments provided by the utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the drip tray of the utility model;

[0024] Figure 3 A half-section view of the drip tray of the utility model;

[0025] Figure 4 A partial half-section view of a gate valve suitable for ultra-low temperature environments provided by the utility model;

[0026] Figure 5 For the utility model Figure 1 A local enlarged view of point A;

[0027] Figure 6 For the utility model Figure 1 A partial enlarged view of point B.

[0028] In the figure: 1 valve body;

[0029] 2 long neck valve cover, 21 upper cover body, 22 lower cover body;

[0030] 3 valve stem;

[0031] 4 valve seat;

[0032] 5 gates;

[0033] 6 upper sealing device, 61 packing, 62 packing gland, 63 packing pressure plate;

[0034] 7 lower sealing device, 71 sealing ring, 72 sealing pressure plate;

[0035] 8 drip trays. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] like Figure 1 As shown, the utility model provides a gate valve suitable for ultra-low temperature environment, comprising: a valve body 1, a long-necked valve cover 2 is installed on the valve body 1, a valve stem 3 is passed through the long-necked valve cover 2, the bottom end of the valve stem 3 extends into the valve body 1, a valve stem nut is installed on the top of the valve stem 3, and a valve stem rotating device is provided on the valve stem nut;

[0038] A valve seat 4 is installed in the valve body 1, and a gate plate 5 which is tightly fitted with the valve seat 4 is connected to the bottom end of the valve stem 3;

[0039] An upper sealing device 6 is provided between the upper end of the long-necked valve cover 2 and the valve stem 3;

[0040] A lower sealing device 7 is provided between the lower end of the long-necked valve cover 2 and the valve stem 3;

[0041] The working principle and beneficial effects of the above technical solution are:

[0042] When the gate valve is in operation, the valve stem rotating device is driven to drive the valve stem 3 to move vertically, thereby driving the gate plate 5 to move up and down to open and close the pipeline. The upper sealing device 6 and the lower sealing device 7 are used to seal the valve stem 3 to prevent medium leakage during the movement of the valve stem 3.

[0043] In one embodiment, a drip tray 8 is also included.

[0044] The drip tray 8 is fixedly connected to the outer circle of the long-necked valve cover 2, and the drip tray 8 is in an umbrella-shaped structure tilted downward; a spiral groove is provided on the upper surface of the drip tray 8;

[0045] The working principle and beneficial effects of the above technical solution are:

[0046] The drip tray 8 is an overall downwardly inclined structure, and a spiral groove is provided on its upper surface. The gate valve component above the drip tray 8 is prone to produce condensed water under low temperature conditions, and the condensed water will flow onto the drip tray 8. The setting of the spiral groove helps the condensed water on the drip tray 8 to flow along a certain route trajectory, which is convenient for centralized collection and treatment.

[0047] In one embodiment, Figure 2-3 As shown, an inner hole matching the outer circle of the long-necked valve cover 2 is opened in the middle of the drip tray 8, and the drip tray 8 is sleeved on the long-necked valve cover 2 and fixed to the long-necked valve cover 2 by welding.

[0048] The working principle and beneficial effects of the above technical solution are:

[0049] The drip tray 8 is pre-processed with an inner hole matching the long-necked valve cover 2, sleeved on the long-necked valve cover 2, and fixed by welding. The processing is convenient, and the connection method is simple and easy to implement.

[0050] In one embodiment, Figure 4As shown, the long-necked valve cover 2 comprises:

[0051] The upper cover body 21 and the lower cover body 22 are disconnected from the neck, and the upper cover body 21 and the lower cover body 22 are fixed by welding.

[0052] The working principle and beneficial effects of the above technical solution are:

[0053] The long-necked valve cover 2 is disconnected from its neck, which is convenient for installing and fixing the drip tray 8, while reducing the processing difficulty of the long-necked valve cover 2 and improving the matching accuracy of the long-necked valve cover 2 and the upper sealing device 6 and the lower sealing device 7.

[0054] In one embodiment, one end of the spiral groove starts at the edge of the inner hole of the drip tray 8, and the other end of the spiral groove ends at the outer edge of the drip tray 8. The cross section of the spiral groove is set as an arc-shaped groove;

[0055] The working principle and beneficial effects of the above technical solution are:

[0056] The condensed water will move down along the outer end surface of the long-necked valve cover 2 and flow onto the drip tray 8 . The arc-shaped groove has a certain water storage function and guides the condensed water to the outer edge of the drip tray 8 .

[0057] In one embodiment, Figure 5 As shown, the upper sealing device 6 comprises:

[0058] Packing 61, packing gland 62 and packing pressure plate 63, the top of the upper cover 21 is provided with a packing groove, the packing 61 is arranged in the packing groove, the top of the packing 61 is provided with a packing gland 62, the top of the packing gland 62 is provided with the packing pressure plate 63, the packing pressure plate 63 is fastened to the upper cover 21 by bolts, the valve stem 3 passes through the packing groove, the packing 61, the packing gland 62 and the packing pressure plate 63 in sequence to connect the valve stem nut;

[0059] The working principle and beneficial effects of the above technical solution are:

[0060] The packing 61 is filled into the packing groove, and the packing 61 is compacted by the packing pressing plate 63 and the packing pressing sleeve 62 to seal the connection between the valve stem 3 and the upper cover body 21, with good sealing performance.

[0061] In one embodiment, Figure 6 As shown, the lower sealing device 7 comprises:

[0062] Sealing ring 71 and sealing pressure plate 72. A sealing groove is provided at the bottom of the inner cavity where the lower cover 22 contacts the valve stem 3. The sealing ring 71 is provided in the sealing groove and is locked and fixed by the sealing pressure plate 72.

[0063] The working principle and beneficial effects of the above technical solution are:

[0064] The lower sealing device 7 can effectively prevent the dirt in the medium from entering the inner cavity of the long-necked valve cover 2, and reduce the wear on the packing 61 during the movement of the valve stem 3. The sealing ring 71 is set as a graphite sealing ring. In a low temperature environment, the elastic modulus of the graphite sealing ring will decrease, and the strength will also decrease, but the sealing performance will be better. The graphite sealing ring is self-lubricating, has a small friction coefficient, and has a good sealing effect.

[0065] In one embodiment, Figure 4 As shown, the valve stem 3 comprises:

[0066] An upper rod body 31 and a lower rod body 32, wherein the diameter of the upper rod body 31 is smaller than that of the lower rod body 32, the upper rod body 31 is screwed into the lower rod body 32, the gate plate 5 is inserted into the bottom end of the lower rod body 32, the upper rod body 31 is slidably connected to the upper sealing device 6, and the lower rod body 32 is slidably connected to the lower sealing device 7;

[0067] The working principle and beneficial effects of the above technical solution are:

[0068] The valve stem 3 adopts a split structure, and the processing accuracy is determined according to the matching accuracy required by each part, which reduces the overall processing difficulty and saves processing time. The lower end of the valve stem 3 is a large-diameter rod body, which enhances the connection strength with the gate 5.

[0069] In summary:

[0070] The utility model is a gate valve suitable for ultra-low temperature environment, the drip tray 8 is integrally formed and fixedly connected to the outer circle of the long-necked valve cover 2, the drip tray 8 is an umbrella-shaped structure tilted downward, and a spiral groove is provided on the upper surface of the drip tray 8, which helps the condensed water on the drip tray 8 to flow along a certain route trajectory, which is convenient for centralized collection and treatment, and the cross section of the spiral groove is set as an arc groove, which has a certain water storage function and is concentrated to the outer edge of the drip tray 8.

[0071] The split long-necked valve cover 2 is used to cooperate with the installation of the drip tray 8. At the same time, the valve stem 3 also adopts a split structure. The long-necked valve cover 2 and the valve stem 3 can be processed according to the mutual matching accuracy of each part, which reduces the difficulty of overall processing, saves processing time, and also improves the matching accuracy of the long-necked valve cover 2 and the upper sealing device 6 and the lower sealing device 7;

[0072] An upper sealing device 6 and a lower sealing device 7 are respectively provided at the upper end and the lower end of the valve stem 3 , providing double sealing. Meanwhile, the lower sealing device 7 has certain cold-insulating and dirt-blocking effects, thereby improving the sealing performance of the upper sealing device 6 .

[0073] The utility model is suitable for gate valves in ultra-low temperature environments and has the characteristics of one-piece drip tray, split long-neck valve cover and valve stem structure and double sealing device. It can effectively cope with working conditions in ultra-low temperature environments and ensure the normal operation and safety of the equipment.

[0074] The above shows and describes the basic principle, main features and advantages of the utility model. The front, back, left and right used in the text are not specific, mainly for a more intuitive description of the technical solution, and do not have a limiting effect. The technical personnel in this industry should understand that the above implementation is only to illustrate the technical concept and characteristics of the utility model, and its purpose is to enable people familiar with this technology to understand the content of the utility model and implement it, and it cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A gate valve suitable for ultra-low temperature environment, characterized by: include A valve body (1), a long-necked valve cover (2) is mounted on the valve body (1), a valve stem (3) is passed through the long-necked valve cover (2), the bottom end of the valve stem (3) extends into the valve body (1), a valve stem nut is mounted on the top end of the valve stem (3), and a valve stem rotating device is provided on the valve stem nut; A valve seat (4) is installed in the valve body (1), and a gate plate (5) which is tightly fitted with the valve seat (4) is connected to the bottom end of the valve stem (3); An upper sealing device (6) is provided between the upper end of the long-necked valve cover (2) and the valve stem (3); A lower sealing device (7) is provided between the lower end of the long-necked valve cover (2) and the valve stem (3); Also includes a drip tray (8), The drip tray (8) is fixedly connected to the outer circle of the long-necked valve cover (2), and the drip tray (8) is in an umbrella-shaped structure that tilts downward, and a spiral groove is provided on the upper surface of the drip tray (8).

2. A gate valve suitable for ultra-low temperature environment according to claim 1, characterized in that: An inner hole matching the outer circle of the long-necked valve cover (2) is provided in the middle of the drip tray (8); the drip tray (8) is sleeved on the long-necked valve cover (2) and fixed to the long-necked valve cover (2) by welding.

3. A gate valve suitable for ultra-low temperature environment according to claim 1, characterized in that: The long-necked valve cover (2) comprises an upper cover body (21) and a lower cover body (22) which are disconnected from the neck thereof, and the upper cover body (21) and the lower cover body (22) are fixed by welding.

4. The gate valve suitable for ultra-low temperature environment according to claim 1, characterized in that: One end of the spiral groove starts at the edge of the inner hole of the drip tray (8), and the other end of the spiral groove ends at the outer edge of the drip tray (8), and the cross section of the spiral groove is arranged as an arc-shaped groove.

5. The gate valve suitable for ultra-low temperature environment according to claim 3, characterized in that: The upper sealing device (6) comprises: a packing (61), a packing pressing sleeve (62) and a packing pressure plate (63); a packing groove is arranged on the top of the upper cover body (21); the packing (61) is arranged in the packing groove; a packing pressing sleeve (62) is arranged on the top of the packing (61); a packing pressure plate (63) is arranged on the top of the packing pressing sleeve (62); the packing pressure plate (63) is fastened to the upper cover body (21) by bolts; the valve stem (3) passes through the packing groove, the packing (61), the packing pressing sleeve (62) and the packing pressure plate (63) in sequence to connect the valve stem nut.

6. The gate valve suitable for ultra-low temperature environment according to claim 3, characterized in that: The lower sealing device (7) comprises: a sealing ring (71) and a sealing pressure plate (72); a sealing groove is provided at the bottom of the inner cavity where the lower cover (22) contacts the valve stem (3); the sealing ring (71) is arranged in the sealing groove and is locked and fixed by the sealing pressure plate (72).

7. The gate valve suitable for ultra-low temperature environment according to claim 1, characterized in that: The valve stem (3) comprises an upper stem body (31) and a lower stem body (32); the diameter of the upper stem body (31) is smaller than the diameter of the lower stem body (32); the upper stem body (31) is screwed into the lower stem body (32); a gate plate (5) is inserted at the bottom end of the lower stem body (32); the upper stem body (31) is slidably connected to an upper sealing device (6); and the lower stem body (32) is slidably connected to a lower sealing device (7).

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