Convenient-to-disassemble high-pressure water injector for coal mine

Abstract

The utility model relates to the technical field of high-pressure water injectors, in particular to a coal mine high-pressure water injector convenient to disassemble, which comprises a screw head, one side of the screw head is connected with a shell through threads, a central shaft is arranged in the shell, and one end, far away from the screw head, of the central shaft is connected with a reverse screw thread quick connector through threads. Two special stainless steel bearings are sleeved on the central shaft in the shell, a framework oil seal I is arranged at the front end of the central shaft, a framework oil seal II is arranged on one side of the special stainless steel bearing on the central shaft, a bearing cover is arranged on one side of the framework oil seal II, and the bearing cover is movably connected with the shell. The end face of one side of the special stainless steel bearing is designed to be in an inwards-concave arc shape, when the balls make contact with the outer ring, the contact face is an arc face, in other words, one fourth of the section of the rolling shaft can make contact with the inner arc face of the outer ring, and therefore when the water pressure is large, the pressure resistance of the bearing can be increased, and the service life of the bearing can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure water injector technology, specifically to a high-pressure water injector for coal mines that is easy to disassemble. Background Technology

[0002] High-pressure water injectors, also known as water supply devices, air supply devices, water tails, water pumps, or faucets, employ highly wear-resistant seals to achieve leak-proof and high-pressure resistance. They are typically rear-mounted follower-type transmission devices, commonly used in coal mining and drilling operations, connected to drill rods to supply air and water, reduce dust and pressure, and perform coal cracking under certain high pressure. High-pressure water injectors are an indispensable piece of equipment in coal mine production.

[0003] In the prior art, such as the high-pressure water injector for directional drilling in coal mines disclosed in announcement number "CN221942346U", a water injection connector, a hollow shaft, and a housing are provided. The housing is connected to the drill rod by the hollow shaft and the housing. The hollow shaft can rotate relative to the housing so that the water injector can counteract the axial force generated during water injection. Furthermore, a thrust cylindrical roller bearing is provided to bear heavy loads and vibration loads, thereby ensuring the stability of the overall structure of the water injector during high-pressure water injection. An end cap is fitted on the shaft of the hollow shaft, and a dustproof ring is fitted between the end cap and the hollow shaft. The end cap and the housing are firmly connected by tightening the internal hexagonal cone end set screw, which prevents water leakage at the connection. Secondly, the dustproof ring fitted between the hollow shafts can seal and protect the connection between the end cap and the hollow shaft, preventing dust or debris from entering the connection gap.

[0004] However, the above uses three bearings, which are easily damaged. Since the high-pressure water injector is used in a water-rich environment, it is particularly prone to damage. In addition, the existing technology has an integrated design where the threaded end of the drill rod is integrated with the housing, making it inconvenient to replace. Utility Model Content

[0005] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing a reasonably designed and easily disassembled high-pressure water injector for coal mines, which can solve the aforementioned defects.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: It includes a threaded end, one side of which is connected to a housing via a thread, a central shaft is provided inside the housing, and the end of the central shaft away from the threaded end is connected to a reverse threaded quick connector via a thread, two special stainless steel bearings are sleeved on the central shaft inside the housing, a skeleton oil seal one is provided on the front end of the central shaft, a skeleton oil seal two is provided on the central shaft on one side of a special stainless steel bearing, a bearing cover is provided on one side of the skeleton oil seal two, and the bearing cover is movably connected to the housing.

[0007] Preferably, the special stainless steel bearing includes an outer ring, one end face of which is a concave arc shape, a retainer is provided inside the outer ring, a plurality of corresponding balls are provided inside the retainer, and an inner ring is provided on the retainer.

[0008] Preferably, the housing is provided with an embossed pattern.

[0009] Preferably, a sealing ring is also provided between the central shaft and the housing.

[0010] The beneficial effects of this utility model after adopting the above structure are:

[0011] 1. This utility model uses two special stainless steel bearings. One end face of the special stainless steel bearing is designed with an inwardly concave arc shape. When the ball contacts the outer ring, the contact surface is an arc surface. That is, one-quarter of the cross-section of the roller can contact the inner arc surface of the outer ring. Therefore, when the water pressure is high, the bearing's pressure resistance can be increased and the bearing's service life can be extended.

[0012] 2. This utility model uses a threaded connection between the threaded end and the housing to make the threaded end detachable, which is convenient to use. When different diameter water injectors are needed, different threaded ends can be replaced.

[0013] 3. This utility model connects one end of the central shaft to a reverse threaded quick connector. The thread helps prevent water leakage and tightens as it is tightened during operation.

[0014] 4. This utility model can play a role in preventing slipping by setting embossed patterns on the surface of the shell. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a front view of the structure of this utility model;

[0017] Figure 3 This is a rear view of the structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the shell of this utility model;

[0019] Figure 5 This is an exploded structural diagram of the special stainless steel bearing of this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Threaded end; 2. Housing; 3. Central shaft; 4. Reverse threaded quick connector; 5. Special stainless steel bearing; 51. Outer ring; 52. Retainer; 53. Ball bearing; 54. Inner ring; 6. Oil seal 1; 7. Oil seal 2; 8. Bearing cover; 9. Embossed pattern; 10. Sealing ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figures 1-5 As shown, this utility model proposes a high-pressure water injector for coal mines that is easy to disassemble. It includes a threaded head 1, and a housing 2 is connected to one side of the threaded head 1 by a thread. The threaded head 1 and the housing 2 are detachable. By replacing different threaded heads 1, it can be prepared for the needs of water injectors of different diameters. A central shaft 3 is provided inside the housing 2. The end of the central shaft 3 away from the threaded head 1 is connected to a reverse thread quick connector 4 by a thread. Two special stainless steel bearings 5 ​​are fitted on the central shaft 3 inside the housing 2. A skeleton oil seal 6 is provided at the front end of the central shaft 3. A skeleton oil seal 7 is provided on one side of the special stainless steel bearing 5 on the central shaft 3. A bearing cover 8 is provided on one side of the skeleton oil seal 7. The bearing cover 8 is movably connected to the housing 2.

[0024] The special stainless steel bearing 5 includes an outer ring 51, one end face of which is a concave arc shape design. A retainer 52 is provided inside the outer ring 51, and a number of corresponding balls 53 are provided inside the retainer 52. An inner ring 54 is provided on the retainer 52. All parts inside the special stainless steel bearing 5 are made of 316 stainless steel. The concave arc shape design of one end face of the bearing allows the balls 53 to contact the outer ring 51 with an arc surface. That is, one-quarter of the cross-section of the balls 53 can contact the inner arc surface of the outer ring 51. Therefore, under high water pressure, the bearing can increase its pressure resistance and extend its service life.

[0025] The shell 2 is provided with embossed patterns 9, which can play a role in preventing slipping when the staff touches the embossed patterns 9;

[0026] A sealing ring 10 is also provided between the central shaft 3 and the housing 2.

[0027] The principle and usage process of this utility model:

[0028] When installation is required, the threads of the housing 2 are aligned with the required thread head 1, and then installation can be carried out. Two special stainless steel bearings 5 ​​are provided between the central shaft 3 and the housing 2, which further rotates the central shaft 3. The other end of the central shaft 3 away from the thread head 1 can be connected to a reverse thread quick connector 4 through the thread. Through the action of the thread, water leakage can be prevented. During operation, it will tighten more and more to realize water injection operation.

[0029] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A high pressure water injector for coal mines which is easy to disassemble, characterized in that: It includes the silk head (1), one side of the silk head (1) is connected with the shell (2) through the thread connection, the shell (2) is equipped with the central shaft (3), the central shaft (3) is connected with the reverse thread quick connector (4) through the thread connection at the end away from the silk head (1), the central shaft (3) is equipped with two special stainless steel bearings (5) on the sleeve in the shell (2), the central shaft (3) is equipped with the skeleton oil seal one (6) on the front end, the central shaft (3) is equipped with the skeleton oil seal two (7) on one side of a special stainless steel bearing (5), the skeleton oil seal two (7) is equipped with the bearing cover (8) on one side, the bearing cover (8) is movably connected with the shell (2).

2. The high-pressure water injector for coal mines according to claim 1, characterized in that: The special stainless steel bearing (5) includes the outer ring (51), one side end surface of the outer ring (51) is designed as the inward concave arc line, the outer ring (51) is equipped with the retainer (52) inside, the retainer (52) is equipped with corresponding several ball bearings (53) inside, the retainer (52) is equipped with the inner ring (54).

3. The high-pressure water injector for coal mines according to claim 2, characterized in that: The shell (2) is equipped with the embossed pattern (9).

4. The high-pressure water injector for coal mines according to claim 3, characterized in that: The sealing ring (10) is further arranged between the central shaft (3) and the shell (2).

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