Underground valve connector protection structure

Abstract

The utility model relates to the field of underground valves, and discloses an underground valve connector protection structure which is arranged between an underground valve and a valve opening and closing rod, a standard connector is arranged at the top of the underground valve, a connector sleeve used for screwing the standard connector is arranged at the bottom of the valve opening and closing rod, and the underground valve connector protection structure further comprises a protection cover. A cover body of the protective cover is matched with a lengthened outer pipe of the buried valve so that the cover body can be arranged at the top of the lengthened outer pipe in a sleeving mode, a connector which is the same as a standard connector in size and shape is arranged at the top of the protective cover, and a clamping mechanism used for being matched with the connector in a clamping mode is arranged on a connector sleeve. The valve opening and closing rod grabs and releases the protection cover through the clamping mechanism. On the basis of opening and closing operation of an existing buried valve, the protective cover is additionally arranged on the top of the valve rod of the buried valve, so that a worker can use the same valve opening and closing rod to disassemble and assemble the protective cover and screw a standard connector of the valve rod in sequence, and the valve opening and closing rod has the advantages of being simple in structure, comprehensive and reliable in protection, simple in operation step and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of buried valves, in particular to a protective structure for buried valve joints. Background Art

[0002] Gas pipelines are often buried underground. In order to facilitate the opening and closing of valves on the pipelines, extended valve stems are generally used for buried valves. As shown in the attached Figure 1 figure, during construction in the prior art, a small-diameter square or circular shaft is reserved at the buried valve 1. Both the buried valve 1 and the gas pipeline are buried below the bottom of the shaft, and the top of the extended valve stem of the buried valve 1 is higher than the bottom of the shaft.

[0003] When the pipeline needs to be inspected and repaired and the buried valve 1 needs to be opened or closed, a T-shaped valve opening and closing rod 2 can be used to turn the standard joint 13 at the top of the extended valve stem of the buried valve 1. A joint sleeve is provided at the bottom of the valve opening and closing rod 2, and the hole opened at the bottom of the joint sleeve is adapted in size and shape to the standard joint 13 at the top of the buried valve 1, so that the joint sleeve can just be sleeved on the standard joint 13. Workers can turn the valve opening and closing rod 2 without going down the shaft, so that the joint sleeve rotates synchronously, thereby turning the standard joint 13, realizing the opening and closing of the buried valve 1.

[0004] Since the ventilation in the shaft is poor and it is relatively humid, the surface of the buried valve 1 is coated with paint, which has an excellent anti-rust effect. However, during long-term use, since the top of the valve stem is flat, dirt and gravel often accumulate on the top of the valve stem. When workers turn the buried valve 1 with the valve opening and closing rod 2, sundries and gravel are likely to enter the gaps between the valve stem and the inner pipe and between the inner pipe and the extended outer pipe 12, aggravating the wear of the sealing parts inside the buried valve 1, increasing the leakage risk, and shortening the service life of the buried valve 1 at the same time.

[0005] To avoid the accumulation of sundries on the top of the valve stem, prevent gravel from entering the inside of the buried valve 1, and facilitate the operation of workers, a protective structure specifically applicable to the buried valve 1 needs to be designed. Summary of the Utility Model

[0006] Aiming at the problems existing in the prior art: sundries such as dirt and gravel accumulated on the top of the valve stem are likely to enter the gaps between the valve stem and the inner pipe and between the inner pipe and the outer pipe, aggravating the wear of the sealing parts inside the buried valve, increasing the leakage risk, and shortening the service life of the buried valve at the same time. The purpose of the utility model is to provide a protective structure for buried valve joints. On the basis of the opening and closing operation of the existing buried valve, a protective cover is added to the top of the valve stem of the buried valve, so that workers can use the same valve opening and closing rod to disassemble and assemble the protective cover and turn the standard joint of the valve stem successively, which has the advantages of simple structure, comprehensive and reliable protection, and concise operation steps.

[0007] To achieve the above object, the technical solution of the present utility model is as follows:

[0008] An underground valve joint protection structure is provided between the underground valve and the valve opening and closing rod. A standard joint is provided at the top of the underground valve, and a joint sleeve for screwing the standard joint is provided at the bottom of the valve opening and closing rod. The protection structure further includes a protective cover. The cover body of the protective cover is adapted to the extended outer pipe of the underground valve so that the cover body can be sleeved on the top of the extended outer pipe. A connecting head having the same size and shape as the standard joint is provided at the top of the protective cover. A clamping mechanism for clamping and cooperating with the connecting head is provided on the joint sleeve. The valve opening and closing rod realizes the grasping and releasing of the protective cover through the clamping mechanism.

[0009] The present utility model is further configured as follows: A positioning hole with a vertically downward opening and cooperating with the standard joint is provided on the joint sleeve. A spring positioning bead capable of telescoping in the horizontal direction is provided in the positioning hole. A connecting rod is provided between the connecting head and the cover body. In the horizontal direction, the size of the connecting rod is smaller than the size of the connecting head. After the connecting head completely enters the positioning hole, the spring positioning bead pops out and is clamped with the lower edge of the connecting head.

[0010] The present utility model is further configured as follows: The distance between the spring positioning bead and the lower edge of the positioning hole is greater than the height of the standard joint.

[0011] The present utility model is further configured as follows: The cover body includes a first cover body, the first cover body is frustum-shaped and the height of the first cover body is greater than the height of the standard joint.

[0012] The present utility model is further configured as follows: The cover body further includes a cylindrical second cover body. The axis of the second cover body coincides with the axis of the first cover body and the first cover body is located at the top of the second cover body. The inner diameter of the second cover body is greater than the outer diameter of the extended outer pipe.

[0013] The present utility model is further configured as follows: A fixing ring coinciding with the axis of the extended outer pipe is provided on the outer edge of the extended outer pipe. The outer diameter of the fixing ring is greater than the outer diameter of the second cover body. The distance between the fixing ring and the upper edge of the extended outer pipe is equal to the height of the second cover body.

[0014] The present utility model is further configured as follows: The cover body further includes a cylindrical third cover body. The axis of the third cover body coincides with the axis of the second cover body and the third cover body is located at the bottom of the second cover body. The inner diameter of the third cover body is greater than the outer diameter of the fixing ring.

[0015] The present utility model is further configured as follows: A clamping block is provided on the inner wall of the third cover body, a notch for the clamping block to pass through is formed on the fixing ring, and the distance between the upper edge of the clamping block and the upper edge of the third cover body is greater than the height of the fixing ring.

[0016] The present utility model is further configured as follows: A plurality of clamping blocks are circumferentially arranged along the inner wall of the third cover body, and notches are formed at corresponding positions on the fixing ring. The diameter of the circle formed by the ends of the plurality of clamping blocks facing the axis of the third cover body is smaller than the outer diameter of the fixing ring.

[0017] The present utility model is further configured as follows: The size of the notch is greater than the size of the clamping block.

[0018] In summary, the beneficial effects achieved by the present utility model are as follows:

[0019] (1) By means of the connector provided at the top of the protective cover, which has the same size and shape as the standard connector, and the clamping mechanism provided on the connector sleeve, the protective cover can be grasped and released by using the valve opening and closing rod, so that workers can disassemble and assemble the protective cover on the top of the buried valve without going down into the well. And after removing the protective cover, the same valve opening and closing rod can still be used to screw the standard connector of the buried valve, meeting the invention purpose of adding a protective cover to the buried valve without increasing the operation complexity.

[0020] (2) The spring positioning beads are arranged inside the positioning holes of the connector sleeve as the clamping mechanism, and a connecting rod is added between the connector and the cover body to cooperate with it. When the connector enters the positioning hole, the spring positioning beads are pressed into the cavity, and when the connector completely enters the positioning hole, the spring positioning beads pop out and are clamped with the lower edge of the connector, so that the protective cover can be grasped by using the valve opening and closing rod, effectively simplifying the structure of the clamping mechanism and having good economy.

[0021] (3) The height of the spring positioning beads in the positioning holes is greater than the height of the standard connector, so that the standard connector cannot touch the spring positioning beads after entering the positioning hole, avoiding excessive wear of the spring positioning beads during the process of frequently screwing the standard connectors on different buried valves by using the valve opening and closing rod.

[0022] (4) The fixing ring provides support for the protective cover. Since the protective cover is composed of multiple cover bodies, the frustum-shaped first cover body can prevent soil and gravel from accumulating at the upper end of the protective cover; after the second cover body is sleeved on the extended outer pipe, the upper surface of the fixing ring supports the lower edge of the second cover body and thus supports the entire protective cover; after the clamping block provided on the inner wall of the third cover body passes vertically downward through the notch on the fixing ring, the protective cover can be rotated by a certain angle and then lifted upward, so that the upper edge of the clamping block abuts against the lower surface of the fixing ring, enabling the connector at the top of the protective cover to be disengaged from the positioning hole after pressing the spring positioning beads into the cavity, and releasing the connection between the valve opening and closing rod and the protective cover. Brief Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the operation principle of the buried valve in the background technology of the present invention;

[0025] Figure 2 It is an exploded view of the protective structure of the buried valve joint in the present invention;

[0026] Figure 3 It is a schematic diagram of the operation of the valve opening and closing rod for screwing the buried valve;

[0027] Figure 4 It is Figure 3 a partial enlarged view of part A in;

[0028] Figure 5 It is a bottom view of the joint sleeve;

[0029] Figure 6 It is a schematic diagram of the structure of the protective cover installed on the buried valve Figure 1 ;

[0030] Figure 7 It is a schematic diagram of the cooperation between the joint sleeve and the connector when the valve opening and closing rod is used to screw the protective cover; Figure 1 ;

[0031] Figure 8 It is a schematic diagram of the cooperation between the joint sleeve and the connector when the valve opening and closing rod is used to screw the protective cover; Figure 2 ;

[0032] Figure 9 It is a schematic diagram of the cooperation between the joint sleeve and the connector when the valve opening and closing rod is used to screw the protective cover; Figure 3 ;

[0033] Figure 10 It is a schematic diagram of the structure of the protective cover installed on the buried valve Figure 2 ;

[0034] Figure 11 It is a top view of the lengthened outer tube;

[0035] Figure 12 It is a bottom view of the protective cover;

[0036] Figure 13 It is a top view of the protective cover.

[0037] In the figure: 1. Buried valve; 11. Valve seat; 12. Extended outer pipe; 13. Standard joint; 14. Fixed ring; 141. Notch; 2. Valve opening and closing rod; 21. Connector sleeve; 211. Positioning hole; 212. Spring positioning bead; 3. Protective cover; 31. Connecting head; 32. Connecting rod; 33. First housing; 34. Second housing; 35. Third housing; 351. Block. Detailed implementation mode

[0038] Next, in combination with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. For the sake of easy explanation, the terms "vertical", "horizontal", "left", "right", "up", "down", "inside", "outside", "bottom", etc. used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application 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 to the present application.

[0039] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0040] As shown in the Figure 2 attached drawings, a protective structure for a buried valve joint is provided between the buried valve 1 and the valve opening and closing rod 2. The protective structure for the buried valve joint in the present invention further includes a protective cover 3.

[0041] The valve opening and closing rod 2 is generally T-shaped and consists of a horizontal bar at the top, a vertical bar in the middle, and a connector sleeve 21 at the bottom.

[0042] The buried valve 1 includes a valve seat 11, an extended outer pipe 12, and a standard joint 13. The valve seat 11 is deeply buried underground and is connected to the gas pipeline at both ends.

[0043] The extended outer pipe 12 is cylindrical, vertically arranged, connected to the valve seat 11 at the bottom, and extends out of the ground at the top. An inner pipe and a valve rod are arranged inside the extended outer pipe 12. The standard joint 13 is located at the top of the extended outer pipe 12, and the standard joint 13 is connected to the valve rod. Therefore, by turning the standard joint 13, the buried valve 1 can be opened or closed.

[0044] As shown in the Figure 3 , Figure 4 and Figure 5 attached drawings, the connector sleeve 21 is cylindrical, and a positioning hole 211 for sleeving on the standard joint 13 and turning the standard joint 13 is provided inside it.

[0045] The opening of the positioning hole 211 is vertically downward, and its cross-sectional shape in the horizontal direction is adapted to the standard joint 13, both being strip-shaped. The depth of the positioning hole 211 in the vertical direction is greater than the height of the standard joint 13.

[0046] When it is necessary to open or close the buried valve 1, the worker holds the top cross bar of the valve opening and closing rod 2, aligns the positioning hole 211 on the joint sleeve 21 with the standard joint 13 at the top of the buried valve 1 and slews it over, and then can rotate the valve opening and closing rod 2 to open or close the buried valve 1.

[0047] As shown in the Figure 5 and Figure 6 figure, the cover body of the protective cover 3 is adapted to the extended outer pipe 12 of the buried valve 1 so that the cover body can be slewed over the top of the extended outer pipe 12.

[0048] The top of the protective cover 3 is provided with a connector 31 having the same size and shape as the standard joint 13. Therefore, after the joint sleeve 21 is aligned with the connector 31, the connector 31 can also be exactly inserted into the positioning hole 211.

[0049] A vertical connecting rod 32 is provided between the cover body of the protective cover 3 and the connector 31. The cross-section of the connecting rod 32 in the horizontal direction can be rectangular, square or circular, as long as its size in the horizontal direction is smaller than the size of the connector 31 in the horizontal direction. The center line of the connecting rod 32 in the vertical direction coincides with the center line of the connector 31 in the vertical direction.

[0050] A clamping mechanism for clamping and cooperating with the connector 31 is provided in the positioning hole 211, and the valve opening and closing rod 2 can grasp and release the protective cover 3 through the clamping mechanism. Specifically, as shown in the Figure 4 and Figure 5 figure, a spring positioning bead 212 capable of telescoping in the horizontal direction is provided in the positioning hole 211. The spring positioning bead 212, also known as a press-in ball head plunger, is a clamping structure in the prior art that can achieve quick positioning and clamping cooperation. The top sphere of it can retract into the cavity against the elastic force of the spring in its own cavity under pressure; when the pressure disappears, the top sphere automatically pops out under the action of the spring elastic force.

[0051] In this embodiment, there are two spring positioning beads 212 in the positioning hole 211, and the two spring positioning beads 212 are located at the same height and are oppositely arranged, respectively at both ends of the length direction of the positioning hole 211 in the horizontal direction.

[0052] The distance between the spring positioning bead 212 and the lower edge opening of the positioning hole 211 is greater than the height of the standard joint 13. Therefore, when the worker turns the standard joint 13 with the valve opening and closing rod 2, the standard joint 13 cannot touch the spring positioning bead 212 after entering the positioning hole 211, avoiding excessive wear of the spring positioning bead 212 during the process of frequently turning the standard joints 13 on different buried valves 1 with the valve opening and closing rod 2.

[0053] Meanwhile, the distance between the spring positioning bead 212 and the upper edge of the positioning hole 211 is greater than the height of the connecting head 31.

[0054] As shown in Figure 6 and Figure 7 shown, the protective cover 3 is installed at the top of the buried valve 1. When it is necessary to open or close the buried valve 1, the worker needs to first remove the protective cover 3 from the buried valve 1 with the valve opening and closing rod 2.

[0055] The specific operation steps are as shown in Figures 7 - 9 shown. The worker operates the valve opening and closing rod 2 to align the positioning hole 211 with the connecting head 31, and then presses down the valve opening and closing rod 2 so that the connecting head 31 enters the positioning hole 211. When the upper edge of the connecting head 31 contacts the two spring positioning beads 212, as the worker continues to press down, the top spheres of the two spring positioning beads 212 are pressed into the internal cavity, and the connecting head 31 can continue to move upward. Since the size of the connecting rod 32 at the bottom of the connecting head 31 is smaller than the size of the connecting head 31, when the connecting head 31 completely enters the positioning hole 211, at the moment when the lower edge of the connecting head 31 moves upward to above the spring positioning beads 212, the pressure applied to the two spring positioning beads 212 disappears, and the top spheres of the two spring positioning beads 212 pop out to complete the clamping fit with the lower edge of the connecting head 31, thus clamping the connecting head 31 in the current position. Only relying on the gravity of the protective cover 3 itself is not enough to press the top spheres of the spring positioning beads 212 into the internal cavity, so the worker can vertically lift the entire protective cover 3 through the valve opening and closing rod 2.

[0056] As shown in Figures 10 - 13 shown, the cover body of the protective cover 3 includes a first cover body 33, a second cover body 34 and a third cover body 35 that are integrally arranged and have the same vertical center line.

[0057] The first cover body 33 is frustum-shaped, its top is fixedly connected to the connecting rod 32 and its bottom is connected to the second cover body 34. The side surface of the first cover body 33 is inclined, which is beneficial to making the sediment falling on the first cover body 33 slide off from the first cover body 33.

[0058] The height of the first cover body 33 is greater than the height of the standard joint 13, so as to prevent interference between the standard joint 13 and the inner wall of the first cover body 33 when the center line of the protective cover 3 deviates from the center line of the extended valve rod.

[0059] The second cover body 34 is a cylindrical barrel-shaped structure. The inner diameter of the second cover body 34 is larger than the outer diameter of the extended outer pipe 12, so that it is convenient for workers to sleeved the second cover body 34 outside the extended outer pipe 12.

[0060] A circular fixing ring 14 is also arranged on the buried valve 1. The fixing ring 14 is fixed on the outer edge side wall of the extended outer pipe 12, and the center of the fixing ring 14 is located on the axis of the extended outer pipe 12.

[0061] The outer diameter of the fixing ring 14 is larger than the outer diameter of the second cover body 34. After the protective cover 3 is sleeved on the extended outer pipe 12, the upper surface of the fixing ring 14 can support the lower edge of the second cover body 34 and then support the entire protective cover 3. And the circular design can ensure that when the center line of the protective cover 3 deviates from the center line of the extended valve rod, the fixing ring 14 can still provide a supporting effect for the protective cover 3.

[0062] Both the upper surface and the lower surface of the fixing ring 14 are flat surfaces. The distance between its upper surface and the upper edge of the extended outer pipe 12 is equal to the height of the second cover body 34. Thus, it can be ensured that the lower edge of the first cover body 33 and the upper edge of the extended outer pipe 12 are at the same height, preventing interference and collision between the inner wall of the first cover body 33 and the standard joint 13 during the process of installing the protective cover 3 on the top of the buried valve 1.

[0063] The third cover body 35 is a cylindrical barrel-shaped structure. The inner diameter of the third cover body 35 is larger than the outer diameter of the fixing ring 14, so that the third cover body 35 can be sleeved on the fixing ring 14.

[0064] Three clamping blocks 351 are arranged on the inner wall of the third cover body 35 along the circumferential direction. The three clamping blocks 351 are evenly distributed around the axis of the third cover body 35. Three notches 141 for the three clamping blocks 351 to pass through are respectively opened at the corresponding positions on the fixing ring 14. The size of the notches 141 is larger than the size of the clamping blocks 351 to facilitate the smooth passing of the clamping blocks 351.

[0065] The distance between the upper surface of the clamping block 351 and the upper edge of the third cover body 35 is larger than the height of the fixing ring 14 in the vertical direction, so that there is a certain distance between the lower surface of the fixing ring 14 and the upper surface of the clamping block 351 after the protective cover 3 is installed on the top of the extended outer pipe 12.

[0066] In the present utility model, the diameter of the circle formed by the ends of the three clamping blocks 351 facing the axis of the third cover 35 is smaller than the outer diameter of the fixing ring 14. Therefore, during the process of installing the protective cover 3 at the top end of the extended outer pipe 12, only when the clamping blocks 351 are aligned with the notch 141 on the fixing ring 14 and pass through the notch 141 of the fixing ring 14 can the lower edge of the second cover 34 contact the upper surface of the fixing ring 14. After the clamping blocks 351 pass through the notch 141 of the fixing ring 14, when the protective cover 3 rotates by a certain angle along its central axis, the clamping blocks 351 and the notch 141 on the fixing ring 14 are staggered in the vertical direction, and the protective cover 3 is installed at the top end of the extended outer pipe 12.

[0067] The implementation principle of the above embodiment is as follows:

[0068] Under normal circumstances, the protective cover 3 is installed at the top end of the buried valve 1 to prevent sundries such as soil and gravel from accumulating at the top end of the extended outer pipe 12 or even entering the buried valve 1. When it is necessary to open or close the buried valve 1, the valve opening and closing rod 2 is used to first remove the protective cover 3 at the top end of the buried valve 1, and then the valve opening and closing rod 2 is used to turn the standard joint 13. The specific operation principle is as follows:

[0069] Align the positioning hole 211 on the valve opening and closing rod 2 with the connector 31 at the top of the protective cover 3, and press down the valve opening and closing rod 2 so that the connector 31 enters the positioning hole 211. During this process, the spring positioning bead 212 in the positioning hole 211 is first compressed and then pops out by itself, and the spring positioning bead 212 clamps the connector 31 in the positioning hole 211. At this time, turn the valve opening and closing rod 2, and the protective cover 3 will rotate synchronously. When the clamping block 351 on the protective cover 3 is within the range of the notch 141 on the fixing ring 14 in the vertical direction, lift the valve opening and closing rod 2 vertically upward to separate the protective cover 3 from the buried valve 1 and lift the protective cover 3 out of the well. After the worker fixes the protective cover 3 and lifts the valve opening and closing rod 2, the connector 31 in the positioning hole 211 moves downward, and the spring positioning bead 212 is compressed again, thereby releasing the clamping of the connector 31. At this time, the protective cover 3 can be separated from the valve opening and closing rod 2. At this time, the worker extends the valve opening and closing rod 2 into the well again so that the positioning hole 211 is aligned with the standard joint 13, and turning the valve opening and closing rod 2 can turn the buried valve 1.

[0070] After the operation on the buried valve 1 is completed, first insert the connector 31 at the top of the protective cover 3 completely into the positioning hole 211 so that the spring positioning bead 212 is engaged with the connector 31. Then extend the protective cover 3 into the well and adjust the position of the protective cover 3 by rotating the valve opening and closing rod 2 until the block 351 on the third cover body 35 is within the range of the notch 141 on the fixed ring 14 in the vertical direction and passes through the notch 141 of the fixed ring 14. At this time, the lower edge of the second cover body 34 contacts the upper surface of the fixed ring 14, and the fixed ring 14 supports the entire protective cover 3. The worker then rotates the valve opening and closing rod 2 by a certain angle so that after the protective cover 3 rotates by a certain angle along its central axis, the block 351 and the notch 141 on the fixed ring 14 are displaced in the vertical direction. At this time, the worker vertically upwardly pulls the valve opening and closing rod 2, and the lower surface of the fixed ring 14 abuts against the upper surface of the block 351 on the third cover body 35, so that the protective cover 3 cannot move upward with the valve opening and closing rod 2. The spring positioning bead 212 in the positioning hole 211 is compressed again, thereby releasing the engagement with the connector 31, and the protective cover 3 is separated from the valve opening and closing rod 2, and the protective cover 3 is installed at the top of the extended outer pipe 12.

[0071] Thus, the worker can use the same valve opening and closing rod 2 to disassemble and assemble the protective cover 3 and screw the standard connector 13 of the buried valve 1 successively without going down into the well. The protective structure for the buried valve connector provides comprehensive and reliable protection for the buried valve 1, and at the same time, the operation steps of the worker are simple.

[0072] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present invention. Obviously, those skilled in the art can make various changes and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A buried valve joint protection structure, arranged between a buried valve (1) and a valve opening and closing rod (2), wherein a standard joint (13) is arranged at the top of the buried valve (1), and a joint sleeve (21) for screwing the standard joint (13) is arranged at the bottom of the valve opening and closing rod (2), characterized in that: It also comprises a protective cover (3), the cover body of the protective cover (3) being adapted to the extended outer tube (12) of the buried valve (1) so that the cover body can be sleeved on the top of the extended outer tube (12), the top of the protective cover (3) being provided with a connector (31) having the same size and shape as the standard connector (13), the connector sleeve (21) being provided with a snap-fit ​​mechanism for snap-fitting with the connector (31), and the valve opening and closing rod (2) realizing the grasping and releasing of the protective cover (3) through the snap-fit ​​mechanism.

2. The buried valve joint protection structure according to claim 1 is characterized in that: The joint sleeve (21) is provided with a positioning hole (211) which opens vertically downward and cooperates with the standard joint (13); a spring positioning bead (212) which can be extended and retracted in the horizontal direction is arranged in the positioning hole (211); a connecting rod (32) is arranged between the connecting head (31) and the cover body; the size of the connecting rod (32) in the horizontal direction is smaller than the size of the connecting head (31); after the connecting head (31) completely enters the positioning hole (211), the spring positioning bead (212) pops out and is clamped with the lower edge of the connecting head (31).

3. The buried valve joint protection structure according to claim 2 is characterized in that: The distance between the spring positioning bead (212) and the lower edge of the positioning hole (211) is greater than the height of the standard joint (13).

4. The buried valve joint protection structure according to claim 1, characterized in that: The cover body comprises a first cover body (33), the first cover body (33) is in a truncated cone shape, and the height of the first cover body (33) is greater than the height of the standard joint (13).

5. The buried valve joint protection structure according to claim 4 is characterized in that: The cover body also includes a cylindrical second cover body (34), the axis of the second cover body (34) coincides with the axis of the first cover body (33), the first cover body (33) is located on the top of the second cover body (34), and the inner diameter of the second cover body (34) is greater than the outer diameter of the extended outer tube (12).

6. The buried valve joint protection structure according to claim 5, characterized in that: A fixing ring (14) is arranged on the outer edge of the extended outer tube (12) and coincides with the axis of the extended outer tube (12); the outer diameter of the fixing ring (14) is greater than the outer diameter of the second cover body (34); and the distance between the fixing ring (14) and the upper edge of the extended outer tube (12) is equal to the height of the second cover body (34).

7. The buried valve joint protection structure according to claim 6, characterized in that: The cover body also includes a cylindrical third cover body (35), the axis of the third cover body (35) coincides with the axis of the second cover body (34) and the third cover body (35) is located at the bottom of the second cover body (34), and the inner diameter of the third cover body (35) is greater than the outer diameter of the fixing ring (14).

8. The buried valve joint protection structure according to claim 7, characterized in that: A clamping block (351) is provided on the inner wall of the third cover body (35), a notch (141) is provided on the fixing ring (14) for the clamping block (351) to pass through, and the distance between the upper edge of the clamping block (351) and the upper edge of the third cover body (35) is greater than the height of the fixing ring (14).

9. The buried valve joint protection structure according to claim 8, characterized in that: A plurality of clamping blocks (351) are circumferentially arranged on the inner wall of the third cover body (35), and notches (141) are provided at corresponding positions on the fixing ring (14), and the diameter of the circle formed by one end of the plurality of clamping blocks (351) facing the axis of the third cover body (35) is smaller than the outer diameter of the fixing ring (14).

10. The buried valve joint protection structure according to claim 8, characterized in that: The size of the notch (141) is larger than the size of the block (351).

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