Labyrinth type flow channel stop valve

Abstract

The utility model discloses a labyrinth type flow channel stop valve, which belongs to the technical field of stop valves and comprises a labyrinth valve body component, a valve rod is mounted at the top of the labyrinth valve body component, a discharge pipe is mounted on one side of the labyrinth valve body component, and a delivery pipe is mounted on one side, far away from the discharge pipe, of the labyrinth valve body component. An input pipe is arranged on the side, away from the labyrinth valve body assembly, of the conveying pipe, flanges are installed on the outer side of the input pipe and the outer side of the discharging pipe, and the conveying pipe and the input pipe are connected through a length adjusting filtering device. By arranging the length-adjusting filtering device, a worker can adjust the overall length of the stop valve to a certain degree through cooperation of the movable shell, the lead screw and other structures when needed, the stop valve can filter impurities passing through the filter screen to a certain degree, and therefore the work requirement is better met, and the work efficiency is improved. And the working capability of the stop valve is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of stop valves, and in particular relates to a labyrinth flow channel stop valve. Background Art

[0002] The stop valve, also known as the gate valve, is the most widely used valve. It has small friction between the sealing surfaces during opening and closing, is relatively durable, has a small opening height, is easy to manufacture and maintain, and is suitable not only for medium and low pressures, but also for high pressures.

[0003] Chinese patent application No. 202021190998.3 discloses a high-temperature and high-pressure stop valve based on a labyrinth seal, comprising a valve body, a valve stem threadedly inserted into the valve body, and a valve seat and a valve disc fixedly arranged in the valve body; the valve disc is a disc structure, the upper end surface of the valve disc is provided with a valve stem connecting portion, the valve stem connecting portion is connected to the lower end of the valve stem, and the lower end surface forms a valve disc sealing surface, and a plurality of annular valve disc sealing teeth arranged in sequence along the radial direction are coaxially arranged on the valve disc sealing surface; a valve seat sealing surface matching the valve disc sealing surface is provided on the valve seat; a plurality of annular valve seat sealing teeth arranged in sequence along the radial direction are also provided on the valve seat sealing surface; when the stop valve is opened, the valve stem rotates outward relative to the valve body, the annular valve disc sealing teeth are separated from the annular valve seat sealing teeth, and the valve disc is separated from the valve seat; when the stop valve is closed, the valve stem rotates inward relative to the valve body, the valve disc contacts and seals with the valve seat, and the annular valve disc sealing teeth and the annular valve seat sealing teeth are plugged and closed to form a labyrinth seal secondary structure.

[0004] 1. The above-mentioned disclosed patent has the problem that the overall length of the stop valve cannot be adjusted when needed and the impurities passing through cannot be processed, thereby reducing the working capacity of the stop valve; 2. The above-mentioned disclosed patent has the problem that the valve stem is prone to accidental rotation due to friction and other reasons, which easily affects the normal operation of the stop valve, thereby reducing the practicality of the stop valve. Utility Model Content

[0005] In order to solve the problems raised in the above background technology, the utility model provides a labyrinth flow channel stop valve, which has the characteristics of high working capacity and strong practicality.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a labyrinth flow channel stop valve, comprising a labyrinth valve body assembly, a valve stem is installed on the top of the labyrinth valve body assembly, a discharge pipe is installed on one side of the labyrinth valve body assembly, a delivery pipe is installed on the side of the labyrinth valve body assembly away from the discharge pipe, an input pipe is arranged on the side of the delivery pipe away from the labyrinth valve body assembly, flanges are installed on the outsides of the input pipe and the discharge pipe, the delivery pipe and the input pipe are connected by a length-adjusting filter device, and an anti-rotation limit device is installed on the labyrinth valve body assembly and at a position outside the valve stem.

[0007] Preferably, the adjustable length filtering device includes a fixed shell, a movable shell, a filtering assembly, a first knob, a screw rod, a movable plate and a vertical plate. The fixed shell is installed on the side of the delivery pipe close to the input pipe, the vertical plate is installed above the fixed shell, the screw rod is installed on the side of the vertical plate away from the labyrinth valve body assembly through a bearing, the first knob is installed on the side of the screw rod away from the vertical plate, the movable shell is installed on the input pipe and located outside the fixed shell, the movable plate is installed above the movable shell and located outside the screw rod, and the filtering assembly is installed on the side of the fixed shell away from the delivery pipe.

[0008] Preferably, the filter assembly comprises a filter screen, and the filter screen is installed on a side of the fixed shell away from the delivery pipe.

[0009] Preferably, the filter assembly further comprises a threaded block, and the bottom of the movable shell is threadably mounted with the threaded block.

[0010] Preferably, the anti-rotation limit device includes a support plate, a rotating plate, a threaded hole, a second knob and a screw. A rotating plate is installed above the valve stem, and a plurality of threaded holes are provided near the edge of the rotating plate. A support plate is installed on the labyrinth valve body assembly and below the rotating plate, and a second knob is provided below the support plate. A screw is installed on the side of the second knob close to the support plate.

[0011] Preferably, the inner diameter of the threaded hole is equal to the outer diameter of the screw.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model provides a length adjustment and filtering device, so that the staff can adjust the overall length of the stop valve by moving the shell and the screw rod when necessary, and the stop valve can filter the impurities passing through the filter screen to better meet the needs of the work, thereby improving the working capacity of the stop valve.

[0014] 2. The utility model provides an anti-rotation limit device, so that the staff can, when necessary, perform a certain anti-rotation limit on the valve stem through the cooperation of structures such as threaded holes and screws, thereby reducing the possibility of accidental rotation of the valve stem due to friction and the like, ensuring the normal operation of the stop valve, and further improving the practicality of the stop valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a three-dimensional cutaway view of the utility model;

[0017] Figure 3 It is a three-dimensional cutaway view of the length-adjustable filter device of the utility model;

[0018] Figure 4 It is a three-dimensional cutaway view of the anti-rotation limiting device of the utility model.

[0019] In the figure: 1. labyrinth valve body assembly; 2. discharge pipe; 3. delivery pipe; 4. input pipe; 5. flange; 6. length-adjustable filter device; 61. fixed shell; 62. movable shell; 63. filter assembly; 631. filter screen; 632. threaded block; 64. first knob; 65. screw rod; 66. movable plate; 67. vertical plate; 7. anti-rotation limit device; 71. support plate; 72. rotating plate; 73. threaded hole; 74. second knob; 75. screw rod; 8. valve stem. DETAILED DESCRIPTION

[0020] 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 in 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.

[0021] Example 1

[0022] See also Figure 1-4 The utility model provides the following technical solutions: a labyrinth flow channel stop valve, comprising a labyrinth valve body assembly 1, a valve stem 8 is installed on the top of the labyrinth valve body assembly 1, a discharge pipe 2 is installed on one side of the labyrinth valve body assembly 1, a delivery pipe 3 is installed on the side of the labyrinth valve body assembly 1 away from the discharge pipe 2, an input pipe 4 is arranged on the side of the delivery pipe 3 away from the labyrinth valve body assembly 1, flanges 5 are installed on the outsides of the input pipe 4 and the discharge pipe 2, the delivery pipe 3 and the input pipe 4 are connected by a length-adjusting filter device 6, and an anti-rotation limit device 7 is installed on the labyrinth valve body assembly 1 and located on the outside of the valve stem 8.

[0023] Specifically, the length-adjustable filter device 6 includes a fixed shell 61, a movable shell 62, a filter assembly 63, a first knob 64, a screw rod 65, a movable plate 66 and a vertical plate 67. The fixed shell 61 is installed on the side of the delivery pipe 3 close to the input pipe 4, the vertical plate 67 is installed above the fixed shell 61, the screw rod 65 is installed on the side of the vertical plate 67 away from the labyrinth valve body assembly 1 through a bearing, the first knob 64 is installed on the side of the screw rod 65 away from the vertical plate 67, the movable shell 62 is installed on the input pipe 4 and located outside the fixed shell 61, the movable plate 66 is installed above the movable shell 62 and located outside the screw rod 65, and the filter assembly 63 is installed on the side of the fixed shell 61 away from the delivery pipe 3.

[0024] By adopting the above technical solution, the staff can adjust the overall length of the stop valve to a certain extent through the cooperation of structures such as the moving shell 62 and the screw rod 65 when necessary, so as to better meet the working needs in different situations.

[0025] Specifically, the filter assembly 63 includes a filter screen 631 , and the filter screen 631 is installed on a side of the fixed shell 61 away from the delivery pipe 3 .

[0026] By adopting the above technical solution, the stop valve can filter the impurities passing through the filter 631 to a certain extent, thereby reducing the possibility of damage to the labyrinth valve body assembly 1 due to impurities and better meeting the work needs.

[0027] Specifically, the filter assembly 63 further includes a threaded block 632 , and the bottom of the movable shell 62 is threadedly mounted with the threaded block 632 .

[0028] By adopting the above technical solution, the staff can unscrew the threaded block 632 when necessary, and then remove the impurities filtered and intercepted by the filter 631, thereby reducing the difficulty of removing the impurities and ensuring the normal progress of the work.

[0029] When the present embodiment is used, when the stop valve needs to be used, the first knob 64 in the length-adjusting filter device 6 is rotated, thereby driving the screw rod 65 on the vertical plate 67 to rotate, and the screw rod 65 is threadedly connected to the movable plate 66, and the movable shell 62 under the movable plate 66 is close to the fixed shell 61, so the screw rod 65 drives the movable plate 66 and the movable shell 62 and other structures to move, thereby adjusting the overall length of the stop valve, and then the two flanges 5 are fixed on the required fluid pipeline, the valve stem 8 is rotated, and the labyrinth valve body assembly 1 is opened, so that the fluid passes through the input pipe 4 into the movable shell 62, and then enters the fixed shell 61 after being filtered by the filter screen 631 in the filter assembly 63, and then the fluid passes through the delivery pipe 3, the labyrinth valve body assembly 1 and the discharge pipe 2 for discharge, so that it can be used. When necessary, the staff can unscrew the threaded block 632, and then remove the impurities filtered and intercepted by the filter screen 631.

[0030] Example 2

[0031] The difference between this embodiment and embodiment 1 is that the anti-rotation limit device 7 includes a support plate 71, a rotating plate 72, a threaded hole 73, a second knob 74 and a screw 75. The rotating plate 72 is installed above the valve stem 8, and a plurality of threaded holes 73 are provided near the edge of the rotating plate 72. The support plate 71 is installed on the labyrinth valve body assembly 1 and below the rotating plate 72. The second knob 74 is provided below the support plate 71, and a screw 75 is installed on the side of the second knob 74 close to the support plate 71.

[0032] By adopting the above technical solution, the staff can, when necessary, perform a certain anti-rotation limit on the valve stem 8 through the cooperation of structures such as the threaded hole 73 and the screw 75, thereby reducing the possibility of accidental rotation of the valve stem 8 due to friction and the like, and ensuring the normal operation of the stop valve.

[0033] Specifically, the inner diameter of the threaded hole 73 is equal to the outer diameter of the screw rod 75 .

[0034] By adopting the above technical solution, the stop valve can ensure the normal connection between the screw rod 75 and the threaded hole 73, thereby preventing the existence of a gap between the screw rod 75 and the threaded hole 73, thereby ensuring the normal anti-rotation limit work.

[0035] When this embodiment is in use, when it is necessary to prevent the valve stem 8 from accidentally rotating, the staff turns the second knob 74 in the anti-rotation limit device 7, thereby driving the screw 75 to rotate. The screw 75 is threadedly connected to the support plate 71, so the screw 75 rotates and moves until the screw 75 is connected to the threaded hole 73 on the rotating plate 72, thereby preventing the rotating plate 72 and the valve stem 8 from rotating, thereby preventing the valve stem 8 from accidentally rotating.

[0036] The structure and principle of the labyrinth valve body assembly 1, flange 5, and valve stem 8 composed of a valve body, a valve cover, a valve disc, a valve seat, a packing, a sealing gasket, a valve disc sealing tooth, a valve seat sealing tooth, a thread, a bolt, a nut, an extruded thread, a packing gland, a valve stem connecting part, a valve disc sealing surface, a valve seat sealing surface, a valve seat upper baffle plate and a valve seat lower baffle plate in the utility model have been disclosed in the high-temperature and high-pressure stop valve based on labyrinth sealing disclosed in Chinese patent application No. 202021190998.3. Its working principle is to form a labyrinth sealing auxiliary structure by merging the annular sealing teeth arranged on the sealing surfaces of the valve seat and the valve disc fixedly arranged in the valve body. The multi-stage throttling effect of the labyrinth seal pair structure ensures that the medium with high temperature and high pressure is strictly isolated; after the medium passes through each sealing tooth, its working fluid pressure drops, and after passing through several annular sealing teeth, more levels of pressure reduction are achieved to achieve strict isolation of the medium with high temperature and high pressure. The valve stem connection part at the lower end of the valve stem and the upper end of the valve disc is connected by a thread. If the valve stem or valve disc has defects such as wear, cracks, and bending after long-term operation, the parts can be disassembled and replaced through the threaded connection pair; the valve seat also includes a valve seat upper plate and a valve seat lower baffle plate arranged on both sides of the valve seat sealing surface, which improves the stability of the valve seat in the valve body. The valve seat sealing surface is provided with a valve disc that is connected to the valve disc. The coaxial medium through hole facilitates the inflow of medium; the number of rings of the annular valve disc sealing teeth and the annular valve seat sealing teeth is greater than 3 pairs, and the specific number depends on the pressure level of the medium, so as to achieve the effect of multi-stage pressure reduction, improve the sealing between the sealing teeth, and reduce the risk of internal leakage; the spacing between adjacent annular valve disc sealing teeth and the spacing between adjacent annular valve seat sealing teeth are both 10mm, and the heights of the annular valve disc sealing teeth and the annular valve seat sealing teeth are both greater than 30mm. The valve disc sealing teeth and the annular valve seat sealing teeth are staggered and plugged, and there is a tooth gap of 0.5-1mm in the radial direction, which depends on the surface unevenness of the sealing teeth, so as to isolate the medium. The dual effects of the up and down movement of the valve disc and the valve disc ensure the tightness of the stop valve. The annular valve disc sealing teeth and the annular valve seat sealing teeth are made of stainless steel or hard alloy, which increases the service life of the sealing teeth and avoids wear during long-term use. The upper part of the valve stem is provided with an extrusion thread, which is arranged on the outside of the valve body. The extrusion thread is not in direct contact with the medium, ensuring that the extrusion thread of the valve stem is not corroded by the medium and is convenient for operation. The upper extrusion thread of the valve stem and the internal thread of the upper sleeve of the packing gland form a thread pair, which improves the connectivity of the valve stem in the valve body. The center line of the medium flow from the valve stem to the valve body is 90°, which increases the tightness of the medium in the stop valve.

[0037] The working principle and use process of the utility model are as follows: when the stop valve needs to be used, the first knob 64 in the length-adjusting filter device 6 is turned, thereby driving the screw rod 65 on the vertical plate 67 to rotate, and the screw rod 65 is threadedly connected with the movable plate 66, and the movable shell 62 under the movable plate 66 is close to the fixed shell 61, so the screw rod 65 drives the movable plate 66 and the movable shell 62 and other structures to move, thereby adjusting the overall length of the stop valve, and then fixing the two flanges 5 on the required fluid pipeline, turning the valve stem 8, opening the labyrinth valve body assembly 1, so that the fluid passes through the input pipe 4 into the movable shell 62, and then passes through the filter screen 63 in the filter assembly 63. 1 is filtered and enters the fixed shell 61, and then the fluid is discharged through the delivery pipe 3, the labyrinth valve body assembly 1 and the discharge pipe 2, so as to be used. When necessary, the staff can unscrew the threaded block 632, and then take out the impurities filtered and intercepted by the filter screen 631; when it is necessary to prevent the valve stem 8 from accidentally rotating, the staff turns the second knob 74 in the anti-rotation limit device 7, thereby driving the screw rod 75 to rotate. The screw rod 75 is threadedly connected with the support plate 71, so the screw rod 75 rotates and moves until the screw rod 75 is connected with the threaded hole 73 on the rotating plate 72, thereby preventing the rotating plate 72 and the valve stem 8 from rotating, thereby preventing the valve stem 8 from accidentally rotating.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A labyrinth flow channel stop valve, comprising a labyrinth valve body assembly, characterized in that: A valve stem is installed on the top of the labyrinth valve body assembly, a discharge pipe is installed on one side of the labyrinth valve body assembly, a delivery pipe is installed on the side of the labyrinth valve body assembly away from the discharge pipe, an input pipe is arranged on the side of the delivery pipe away from the labyrinth valve body assembly, flanges are installed on the outsides of the input pipe and the discharge pipe, the delivery pipe and the input pipe are connected by a length-adjusting filter device, and an anti-rotation limit device is installed on the labyrinth valve body assembly and located on the outside of the valve stem.

2. A labyrinth flow channel stop valve according to claim 1, characterized in that: The adjustable length filtering device includes a fixed shell, a movable shell, a filtering assembly, a first knob, a screw rod, a movable plate and a vertical plate. The fixed shell is installed on the side of the delivery pipe close to the input pipe, the vertical plate is installed above the fixed shell, the screw rod is installed on the side of the vertical plate away from the labyrinth valve body assembly through a bearing, the first knob is installed on the side of the screw rod away from the vertical plate, the movable shell is installed on the input pipe and located outside the fixed shell, the movable plate is installed above the movable shell and located outside the screw rod, and the filtering assembly is installed on the side of the fixed shell away from the delivery pipe.

3. A labyrinth flow channel stop valve according to claim 2, characterized in that: The filter assembly comprises a filter screen, and the filter screen is installed on a side of the fixed shell away from the delivery pipe.

4. A labyrinth flow channel stop valve according to claim 3, characterized in that: The filter assembly also includes a threaded block, and the bottom of the movable shell is threadedly mounted with the threaded block.

5. The labyrinth flow channel stop valve according to claim 1, characterized in that: The anti-rotation limit device includes a support plate, a rotating plate, a threaded hole, a second knob and a screw. A rotating plate is installed above the valve stem, and a plurality of threaded holes are provided near the edge of the rotating plate. A support plate is installed on the labyrinth valve body assembly and below the rotating plate. A second knob is provided below the support plate, and a screw is installed on the side of the second knob close to the support plate.

6. A labyrinth flow channel stop valve according to claim 5, characterized in that: The inner diameter of the threaded hole is equal to the outer diameter of the screw rod.

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