A mine sealed high pressure water injector

Abstract

The utility model provides a kind of mine sealed high-pressure water injector.The utility model includes shell, central shaft, primary seal, secondary seal ring, custom seal and the connecting head connected with coal mine drill rod, the other end of connecting head is detachably connected with the end of shell, and connecting head has through-hole.The utility model seals between connecting head and coal mine drill rod by the outer ring wall and inner ring wall of plugging ring, and simultaneously seals the gap between central shaft and shell by the sealing end of primary seal and secondary seal ring, which can greatly reduce the risk of water injector liquid penetration and improve service life.

Description

Technical Field

[0001] This utility model relates to the technical field of coal mine machinery parts, and in particular to a mine-use sealed high-pressure water injector. Background Technology

[0002] When carrying out underground water exploration and drainage or coal seam water injection, a high-pressure water injector needs to be connected to the drill pipe before the corresponding water injection operation is carried out.

[0003] Because manufacturers typically machine drill pipes by starting the internal threads at one end rather than the other, a gap exists between the unthreaded end and the water injector. This results in poor sealing of conventional water injectors when connected to the drill pipe, leading to leakage, resource waste, and reduced lifespan. Conventional sealing methods are inadequate for sealing the drill pipe. Furthermore, the seal between the conventional water injector's outer shell and central shaft is also poor; a simple sealing ring is insufficient, allowing water to seep through the gap between the central shaft and the outer shell. Utility Model Content

[0004] In view of this, the present invention aims to propose a high-pressure sealing water injector for mining, which seals the connection between the connector and the coal mine drill rod through the outer and inner ring walls of the sealing ring, and seals the gap between the central shaft and the outer shell through the sealing end of the primary sealing element and the secondary sealing ring, which can greatly reduce the risk of leakage of the water injector and improve its service life.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A high-pressure water injection device for mining includes a housing, a central shaft, a primary seal, a secondary seal ring, a custom seal, and a connector for connecting to a coal mine drill rod. The other end of the connector is detachably connected to the end of the housing, and the connector has a through hole. Along the axial direction of the outer shell, the central shaft passes through the outer shell, and the central shaft has a through hole communicating with the through hole along the axial direction. The sealing end of the primary seal is located between the central shaft and the outer shell, and the secondary sealing ring is located on one side of the primary seal and is sleeved on the central shaft. The customized seal includes a bottom ring fitted onto the bottom of the connector and a sealing ring protruding from the bottom ring. When the connector is fixed to the coal mine drill rod, the outer ring wall of the sealing ring is attached to the inner wall of the coal mine drill rod, and the inner ring wall of the sealing ring is attached to the outer wall of the connector.

[0006] Furthermore, the primary seal includes a mechanical oil seal fitted at the tail of the central shaft and a retaining ring. The sealing ring of the mechanical oil seal is fitted between the central shaft and the housing. The retaining ring is detachably connected to the end of the central shaft. When the retaining ring is fixedly fitted on the central shaft, the retaining ring compresses the spring of the mechanical oil seal, and the spring stores energy.

[0007] Furthermore, an annular groove is provided circumferentially inside the outer shell, and the outer ring wall of the secondary sealing ring is fitted into the annular groove.

[0008] Furthermore, the secondary sealing ring includes a star-shaped sealing ring or a Glyd ring.

[0009] Furthermore, a first space is provided inside the tail end of the outer casing, and the end of the primary seal and the central shaft are located within the first space.

[0010] Furthermore, a second space is provided inside the first end of the outer casing, and a bearing is provided in the second space. The central shaft passes through the bearing and is interference-fitted with the bearing.

[0011] Furthermore, there are two bearings, located at opposite ends of the second space.

[0012] Furthermore, a bearing cover is snapped onto the first end of the outer shell. One end of the bearing cover is used to seal the second space, and the cross-section of the other end of the bearing cover is hexagonal. The central shaft passes through the bearing cover.

[0013] Furthermore, the outer shell is provided with a storage slot for placing a butter cup, and the oil outlet of the butter cup is connected to the second space.

[0014] Furthermore, a quick connector is fixedly connected to the first end of the central shaft. The quick connector has an internal thread and a water inlet hole that communicates with the through hole. The quick connector is threadedly connected to an external pipeline.

[0015] Compared with the prior art, this utility model has the following advantages: This invention inserts a custom-designed sealing ring into the interior of a coal mine drill rod. The outer wall of the sealing ring adheres to the inner wall of the drill rod, while the inner wall adheres to the outer wall of the connector, filling the unthreaded portion of the drill rod and improving the seal between the connector and the drill rod. Furthermore, a primary seal mechanically seals the gap between the central shaft and the outer casing at the left end of the first space, maximizing the prevention of injection fluid from entering the gap. If injection fluid does enter the gap, a secondary sealing ring can seal it, reducing the risk of leakage and significantly extending the lifespan of the water injector. Attached Figure Description

[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram of the present invention from another perspective; Figure 3 This is an exploded structural diagram of the outer shell and its internal structure of the present invention; Figure 4 This is an exploded structural diagram of the structure on the central rod of this utility model; Figure 5 This is a cross-sectional view from the main perspective of this utility model; Figure 6 This is a schematic diagram showing the corresponding structure of the customized sealing element and the coal mine drill rod of this utility model; Figure 7 This is a cross-sectional view of the unthreaded portion inside the coal mine drill rod of this utility model. Explanation of reference numerals in the attached figures: 1. Outer shell; 2. Central shaft; 3. Secondary sealing ring; 4. Coal mine drill rod; 5. Connector; 6. Through hole; 7. Perforation; 8. Bottom ring; 9. Sealing ring; 10. Mechanical oil seal; 11. Retaining ring; 12. Sealing ring; 13. Spring; 14. Annular groove; 15. First space; 16. Second space; 17. Bearing; 18. Bearing cover; 19. Grease cup; 20. Quick connector; 21. Base; 22. Threaded head; 23. Limiting ring; 24. Schematic diagram of the outer ring wall contact area. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "back" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model; if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This embodiment relates to a mine-use sealed high-pressure water injection device, one exemplary structure of which is as follows: Figure 1-7 As shown.

[0022] Overall, such as Figure 1-2 As shown, the mine-use sealed high-pressure water injector includes a housing 1, a central shaft 2, a primary seal, a secondary seal ring 3, a custom seal, and a connector 5 that connects to a coal mine drill rod 4. The other end of the connector 5 is detachably connected to the end of the housing 1, and the connector 5 has a through hole 6. The preferred connection method between the connector 5 and the housing 1 is a threaded connection, but other conventional connection methods are also acceptable.

[0023] like Figure 3-4 As shown, along the axial direction of the outer shell 1, the central shaft 2 passes through the outer shell 1. The central shaft 2 has a through hole 7 that communicates with the through hole 6 along the axial direction. The sealing end of the primary seal is located between the central shaft 2 and the outer shell 1. The secondary sealing ring 3 is located on one side of the primary seal and is sleeved on the central shaft 2.

[0024] like Figure 6-7As shown, the customized seal includes a bottom ring 8 fitted onto the bottom of the connector 5, and a sealing ring 9 protruding from the bottom ring 8. When the connector 5 is fixed to the coal mine drill rod 4, the outer wall of the sealing ring 9 adheres to the inner wall of the coal mine drill rod 4, and the inner wall of the sealing ring 9 adheres to the outer wall of the connector 5. Preferably, the bottom ring 8 is made of silicone. The connector 5 is divided into two parts: a base 21 at the bottom that is threadedly connected to the outer casing 1, and a threaded head 22 at the top that is threadedly connected to the coal mine drill rod 4. The bottom ring 8 of the custom seal is fitted onto the bottom of the threaded head 22 and fits against the side wall of the base 21. When the threaded head 22 is tightened with the coal mine drill rod 4, the bottom ring 8 is located between the base 21 and the coal mine drill rod 4. The end of the coal mine drill rod 4 presses the bottom ring 8 against the side wall of the base 21. Since the bottom ring 8 is made of silicone, when the end of the coal mine drill rod 4 presses the bottom ring 8, it can fill the gap between the side wall of the base 21 and the end of the coal mine drill rod 4, thereby sealing the connector 5 and the coal mine drill rod 4. Combined with the sealing structure where the sealing ring 9 extends into the coal mine drill rod 4, the sealing performance between the connector 5 and the coal mine drill rod 4 can be greatly improved.

[0025] Specifically, such as Figure 3 As shown, the primary sealing element includes a mechanical oil seal 10 fitted onto the tail of the central shaft 2, and a retaining ring 11. The sealing ring 12 of the mechanical oil seal 10 is fitted between the central shaft 2 and the outer casing 1. The retaining ring 11 is detachably connected to the end of the central shaft 2. When the retaining ring 11 is fixedly fitted onto the central shaft 2, the retaining ring 11 compresses the spring 13 of the mechanical oil seal 10, and the spring 13 stores energy. The retaining ring 11 and the end of the central shaft 2 can be threaded or interference-fitted. When the retaining ring 11 is threaded onto the central shaft 2, the mechanical oil seal 10 is first inserted into the central shaft 2, and then the retaining ring 11 is screwed in. When the retaining ring 11 is screwed to its final position, it compresses the spring 13 of the mechanical oil seal 10, causing the spring 13 to store energy. The spring 13 then pushes against the sealing ring 12 of the mechanical oil seal 10, causing the sealing ring 12 to abut against the interior of the central shaft 2 and the outer casing 1. The principle and installation method of the interference fit between the retaining ring 11 and the central shaft 2 are the same. The difference is that after the mechanical oil seal 10 is inserted into the central shaft 2, only the retaining ring 11 needs to be inserted into the central shaft 2.

[0026] Secondly, such as Figure 5 As shown, an annular groove 14 is formed circumferentially inside the outer casing 1, and the outer wall of the secondary sealing ring 3 is fitted into the annular groove 14. When installing the secondary sealing ring 3, first insert the secondary sealing ring 3 into the annular groove 14, then insert the central shaft 2 into the outer casing 1, so that the central shaft 2 passes through the secondary sealing ring 3. Preferably, the secondary sealing ring 3 is a star-shaped sealing ring or a Glycol ring.

[0027] In this embodiment, a first space 15 is provided inside the tail end of the outer casing 1, and the end of the primary seal and the central shaft 2 is located within the first space 15. The first space 15 provides installation space for the primary seal.

[0028] Furthermore, a second space 16 is provided inside the front end of the outer casing 1. A bearing 17 is installed in the second space 16, and the central shaft 2 passes through the bearing 17 and is interference-fitted with the bearing 17. The second space 16 provides installation space for the bearing 17. The bearing 17 is installed in the second space 16 by interference fit. The bearing 17 is pushed into the second space 16, and then the central shaft 2 is passed through the bearing 17 and fixed to the bearing 17 by interference fit. When high-pressure water flows through the central shaft 2, the central shaft 2 can rotate, that is, the coal mine drill rod 4 can rotate.

[0029] Preferably, there are two bearings 17, located at opposite ends of the second space 16. This provides a stable support structure for the central shaft 2. A retaining ring 23 is provided between the two bearings 17. The retaining ring 23 is fitted onto the central shaft 2. After the first bearing 17 is pushed into the second space 16, the retaining ring 23 is placed into the second space 16. Then, the second bearing 17 is pushed into the second space 16. Finally, the central shaft 2 is made to pass through the second bearing 17, the retaining ring 23, and the first bearing 17 in sequence by means of tapping or other methods.

[0030] Additionally, a bearing 17 cover is snapped onto the first end of the outer casing 1. One end of the bearing 17 cover seals the second space 16, while the other end of the bearing 17 cover has a hexagonal cross-section. The central shaft 2 passes through the bearing 17 cover. The bearing 17 cover and the first end of the outer casing 1 can be connected by a plug or a thread. After the bearing 17 cover is connected to the first end of the outer casing 1, the right end of the bearing 17 cover abuts against the second bearing 17. The bearing 17 cover, the limiting ring 23, and the second space 16 limit the positions of the two bearings 17, improving the stability of the bearings 17. When installing the central shaft 2, first pass the central shaft 2 through the bearing 17 cover, then sequentially pass it through the second bearing 17, the limiting ring 23, and the first bearing 17. When removing the bearing 17 cover, it is removed by rotating the bearing 17 cover. The hexagonal shape of the end of the bearing 17 cover facilitates disassembly.

[0031] In this embodiment, the outer casing 1 has a storage slot for placing a grease cup 19, and the oil outlet of the grease cup 19 is connected to the second space 16. The grease cup 19 can be used to inject oil into the bearing 17 within the second space 16, increasing the lubrication of the bearing 17. Preferably, the grease cup 19 and the storage slot are snap-fitted together, and the oil outlet of the grease cup 19 is exposed to the outside.

[0032] Secondly, a quick connector 20 is fixedly connected to the first end of the central shaft 2. The quick connector 20 has an internal thread and an inlet hole that communicates with the perforation 7. The quick connector 20 is threadedly connected to an external pipeline. The injection solution enters the perforation 7 of the central shaft 2 through the inlet hole.

[0033] The working process of this embodiment is as follows: During installation, first insert the secondary sealing ring 3 into the annular groove 14, push the first bearing 17 into the right end of the second space 16, place the limiting ring 23 into the second space 16, push the second bearing 17 into the left end of the second space 16, then pass the central shaft 2 through the bearing 17 cover, and then through the second bearing 17, the limiting ring 23, the first bearing 17, and the secondary sealing ring 3 in sequence to fix the central shaft 2 onto the bearing 17. Then, insert the bearing 17 cover into the second space 16 to seal the second space 16.

[0034] After the central shaft 2 is fixed on the bearing 17, the mechanical oil seal 10 is fitted onto the end of the central shaft 2. The sealing ring 12 of the mechanical oil seal 10 abuts against the outer shell 1 at the left end of the first space 15 and is filled with oil for sealing. Then, the retaining ring 11 is installed on the central shaft 2. The retaining ring 11 can compress the spring 13 of the mechanical oil seal 10, causing the spring 13 to store energy. After the spring 13 stores energy, it compresses the sealing ring 12, improving the sealing effect.

[0035] Next, thread the outer shell 1 to the connector 5. Finally, fit the custom seal onto the connector 5, ensuring the bottom ring 8 fits against the side wall of the connector 5 base 21, and then screw the connector 5 into the coal mine drill rod 4 for connection. Subsequently, the sealing ring 9 is inserted into the coal mine drill rod 4, where its outer ring wall seals against the inner wall of the coal mine drill rod 4, and its inner ring wall seals against the outer wall of the threaded head 22 of the connector 5. Finally, the bottom ring 8 seals between the side wall of the base 21 and the end of the coal mine drill rod 4.

[0036] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A mine-use sealed high-pressure water injection device, characterized in that: Includes a housing (1), a central shaft (2), a primary seal, a secondary seal (3), a custom seal, and a connector (5) that connects to a coal mine drill rod (4). The other end of the connector (5) is detachably connected to the end of the housing (1), and the connector (5) has a through hole (6). Along the axial direction of the outer shell (1), the central shaft (2) passes through the outer shell (1), and the central shaft (2) has a through hole (7) communicating with the through hole (6) along the axial direction. The sealing end of the primary seal is located between the central shaft (2) and the outer shell (1), and the secondary sealing ring (3) is located on one side of the primary seal and is sleeved on the central shaft (2). The custom seal includes a bottom ring (8) fitted onto the bottom of the connector (5) and a sealing ring (9) protruding from the bottom ring (8). When the connector (5) is fixed to the coal mine drill rod (4), the outer ring wall of the sealing ring (9) is attached to the inner wall of the coal mine drill rod (4), and the inner ring wall of the sealing ring (9) is attached to the outer wall of the connector (5).

2. The mine-use sealed high-pressure water injector according to claim 1, characterized in that: The primary sealing element includes a mechanical oil seal (10) sleeved at the tail of the central shaft (2) and a retaining ring (11). The sealing ring (12) of the mechanical oil seal (10) is sleeved between the central shaft (2) and the outer shell (1). The retaining ring (11) is detachably connected to the end of the central shaft (2). When the retaining ring (11) is fixedly sleeved on the central shaft (2), the retaining ring (11) compresses the spring (13) of the mechanical oil seal (10), and the spring (13) stores energy.

3. The mine-use sealed high-pressure water injector according to claim 1, characterized in that: The outer shell (1) has an annular groove (14) circumferentially formed inside, and the outer wall of the secondary sealing ring (3) is fitted into the annular groove (14).

4. The mine-use sealed high-pressure water injector according to claim 3, characterized in that: The secondary sealing ring (3) includes a star-shaped sealing ring or a Glyd ring.

5. The mine-use sealed high-pressure water injector according to claim 1, characterized in that: The outer casing (1) has a first space (15) inside its tail end, and the ends of the primary seal and the central shaft (2) are located in the first space (15).

6. The mine-use sealed high-pressure water injector according to claim 5, characterized in that: The outer shell (1) has a second space (16) inside its front end. A bearing (17) is provided in the second space (16). The central shaft (2) passes through the bearing (17) and is interference-fitted with the bearing (17).

7. The mine-use sealed high-pressure water injector according to claim 6, characterized in that: There are two bearings (17), which are located at both ends of the second space (16).

8. The mine-use sealed high-pressure water injector according to claim 7, characterized in that: The outer shell (1) is fitted with a bearing (17) cover at the first end. One end of the bearing (17) cover is used to seal the second space (16). The cross-section of the other end of the bearing (17) cover is hexagonal. The central shaft (2) passes through the bearing (17) cover.

9. The mine-use sealed high-pressure water injector according to claim 6, characterized in that: The outer shell (1) has a storage slot for placing a butter cup (19), and the oil outlet of the butter cup (19) is connected to the second space (16).

10. The mine-use sealed high-pressure water injector according to any one of claims 1-9, characterized in that: The first end of the central shaft (2) is fixedly connected to a quick connector (20). The quick connector (20) has an internal thread and a water inlet hole that communicates with the through hole (7). The quick connector (20) is threadedly connected to an external pipeline.

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