Switching device

Abstract

The utility model provides a switching device. The switching device comprises a first connecting sleeve, the first connecting sleeve is internally provided with a first inner hole and a second inner hole which are communicated with each other, the first inner hole is located at the top of the second inner hole, and the annular interior of the second inner hole is provided with an internal thread; the first lining is mounted in the first inner hole, and the interior of the first lining is communicated with the extraction pipe; the second connecting sleeve is located at the bottom of the first connecting sleeve, an external thread section is arranged at the end, facing the first connecting sleeve, of the second connecting sleeve, and a mounting cavity is formed in the external thread section; the second bushing is mounted in the mounting cavity, and the interior of the second bushing is communicated with the water injection pipe; when the first bushing is located at the working position, the external thread section is completely meshed with the internal thread, and the first bushing is communicated with the second bushing, so that the extraction pipe is communicated with the water injection pipe. The technical problem that in the prior art, a switching device cannot bear pressure in the coal seam water injection process is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal seam water injection switching devices in mines, in particular to a switching device. Background Art

[0002] Coal mine dust and gas are two major hazards in coal mines. The generation of coal mine dust can easily cause coal dust explosions underground and can also cause pneumoconiosis among workers, seriously threatening their lives and physical and mental health. Currently, water injection to moisten the coal is considered the most fundamental and effective dust prevention method. This method has been widely used in working faces of "soft" coal seams. Water injection generally requires the construction of specialized water injection boreholes.

[0003] In existing technology, coal seam water injection is carried out using an integrated extraction and water injection device, which directly injects water into the coal seam through the extraction pipe, saving a lot of drilling construction costs. However, the extraction pipe has a large diameter, and an adapter is required between the extraction pipe and the water injection pipe. The coal seam water injection sealing structure must withstand pressures of tens to hundreds of MPa. Among them, the coal seam water injection sealing structure is a sealing technology used in coalbed methane extraction. Its main principle is to seal the coal seam cracks and pores by injecting water into the coal seam, thereby reducing coalbed methane leakage and improving gas extraction efficiency. The coal seam water injection and sealing structure usually includes the following parts: 1. Water injection pipeline: used to transport water from the ground to the coal seam; 2. Water injection well: drilling a well in the coal seam and setting up a water injection pipeline to inject water into the coal seam; 3. Sealing agent: used to form a sealing layer in the cracks and pores of the coal seam to prevent gas leakage; 4. Sealing layer: a layered structure formed by the sealing agent, used to seal the pores and cracks of the coal seam to improve the gas extraction efficiency.

[0004] The most commonly used conversion device currently uses an iron casing with a diameter slightly larger than the extraction pipe. One end of the iron casing is welded to a quick-connect fitting that matches the water injection pipe, leaving the other end untreated. To use it, the outer end of the extraction pipe is wrapped with sealing tape and then inserted into the large end of the adapter. The other end of the extraction pipe is connected to the water injection pipe, and water is then injected into the coal seam. This device has certain disadvantages:

[0005] 1. The connection between the adapter and the extraction pipe cannot bear pressure;

[0006] 2. When water is injected at a low pressure, the connection between the adapter and the extraction pipe will continue to leak, affecting the construction. The water flowing in the tunnel will also pollute the tunnel.

[0007] 3. When water is injected at a high pressure, the adapter and the extraction pipe are in danger of detaching at any time, posing a great safety hazard.

[0008] Therefore, there is no effective solution to the problems of how to ensure that the adapter can withstand a larger pressure (i.e., greater than the pressure that the coal seam water injection and sealing structure can withstand) without affecting production, poor sealing of the connection between the adapter and the extraction pipe, easy pollution, and potential safety hazards of detachment, which urgently need to be solved. Utility Model Content

[0009] The main purpose of the utility model is to provide a transfer device to solve the technical problem in the prior art that the transfer device cannot bear pressure during the coal seam water injection process.

[0010] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a switching device is provided, including: a first connecting sleeve, a first inner hole and a second inner hole are provided inside the first connecting sleeve, the first inner hole and the second inner hole are connected, the first inner hole is located at the top of the second inner hole, and an internal thread is provided on the annular inner part of the second inner hole; a first bushing, the first bushing is installed in the first inner hole, and the interior of the first bushing is connected with the extraction pipe; a second connecting sleeve, the second connecting sleeve is located at the bottom of the first connecting sleeve, and the second connecting sleeve is provided with an external thread section at one end facing the first connecting sleeve, the outside of the external thread section is provided with an external thread that can engage with the internal thread, and the inside of the external thread section is provided with an installation cavity; a second bushing, the second bushing is installed in the installation cavity, and the interior of the second bushing is connected with the water injection pipe; wherein, the external thread section has a working position in which the external thread and the internal thread are fully engaged, and when the external thread section is in the working position, the first bushing is connected with the second bushing, so that the extraction pipe and the water injection pipe are connected.

[0011] Furthermore, when the external thread section is located at the working position, the external thread section is completely located in the second inner hole, and the top end surface of the second bushing abuts against the bottom end surface of the first bushing.

[0012] Furthermore, the first inner hole is a tapered hole, the first bushing is a tapered structure, and the taper of the first inner hole is the same as the taper of the first bushing.

[0013] Furthermore, a first step hole and a second step hole are provided inside the external thread section, the first step hole and the second step hole are connected, the first step hole is located at the top of the second step hole, the diameter of the first step hole is larger than the diameter of the second step hole, and a first step structure is formed at the connection between the first step hole and the second step hole, the first step hole and the second step hole form an installation cavity, and the first step structure is used to support the second bushing of the supporting part.

[0014] Furthermore, the second bushing includes a main body section and a convex edge located at the top of the main body section, the convex edge protrudes outward from the main body section along the radial direction of the main body section, the second bushing is installed in the installation cavity, the convex edge is located in the first step hole, and the bottom end face of the convex edge abuts against the bottom wall of the first step hole, the main body section is located in the second step hole, and the bottom end face of the main body section abuts against the bottom wall of the second step hole.

[0015] Furthermore, a first through hole is provided inside the first bushing, and a second through hole is provided inside the second bushing. When the external thread section is located at the working position, the first through hole and the second through hole are communicated.

[0016] Furthermore, a connecting pipe is provided inside the second connecting sleeve, the top end of the connecting pipe is communicated with the bottom end of the second through hole, and the bottom end of the connecting pipe is communicated with the water injection pipe.

[0017] Furthermore, at least one of the first connecting sleeve, the second connecting sleeve, and the connecting pipe is made of metal material.

[0018] Furthermore, at least one of the first bushing and the second bushing is made of nylon material.

[0019] Furthermore, the outer circumferential surfaces of the first connecting sleeve and the second connecting sleeve are both configured as regular hexagons.

[0020] By applying the technical solution of the present invention, the first bushing is installed in the first inner hole and the second bushing is installed in the installation cavity. When the external thread of the external thread section where the installation cavity is located is fully engaged with the internal thread of the second inner hole, the first bushing is connected to the second bushing, thereby connecting the extraction pipe and the water injection pipe. The first connecting sleeve and the second connecting sleeve are used to strengthen the structural strength of the connection and improve the pressure bearing capacity. The first bushing is arranged in the first connecting sleeve and the second bushing is arranged in the second connecting sleeve to improve the sealing performance of the adapter. The technical solution of the present application solves the technical problem that the adapter cannot withstand pressure during coal seam water injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A disassembled schematic diagram of an embodiment of a switching device according to the present utility model is shown;

[0023] Figure 2 A front view of a first connecting sleeve according to an embodiment of an adapter device of the present utility model is shown;

[0024] Figure 3 A front view of a second connecting sleeve according to an embodiment of an adapter device of the present utility model is shown;

[0025] Figure 4 A front view of a first bushing according to an embodiment of an adapter device of the present invention is shown;

[0026] Figure 5A front view of a second bushing according to an embodiment of an adapter device of the present utility model is shown.

[0027] The above drawings include the following reference numerals:

[0028] 1. First connecting sleeve; 2. Second connecting sleeve; 3. First bushing; 4. Second bushing; 5. First inner hole; 6. Second inner hole; 7. External thread section; 8. First step structure; 9. Connecting pipe; 10. Quick connector; 11. Fixing hole; 12. Convex edge; 20. Mounting cavity; 21. First step hole; 22. Second step hole; 23. First through hole; 24. Second through hole. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0033] Coal mine dust and gas are two major hazards in coal mines. Coal mine dust can easily cause coal dust explosions underground and can also cause pneumoconiosis in workers, seriously threatening their lives and physical and mental health. Currently, water injection to moisten the coal is considered the most fundamental and effective method of dust prevention, and is widely used in working faces of "soft" coal seams. Water injection generally requires the construction of specialized water injection boreholes. However, some mines, in order to pre-extract coal seam gas, have deployed a large number of in-seam gas extraction holes ahead of the working face. Through various treatments, these holes are sealed with integrated gas and water injection.

[0034] Coal seam water injection is a commonly used production-increasing technology in oil and gas field development. Its working principle is to increase the pressure inside the coal seam by injecting water or other liquids into the coal seam, thereby prompting natural gas or coalbed methane to flow to the wellhead and increase production.

[0035] The process of coal seam water injection generally includes the following steps:

[0036] Step S1, coal seam exploration: First, it is necessary to determine the location, thickness, gas composition and other information of the coal seam through geological exploration.

[0037] Step S2, wellhead preparation: drilling a well near the coal seam and completing the installation of wellhead equipment in order to carry out water injection operations.

[0038] Step S3: water source preparation: prepare sufficient water source and select appropriate injection liquid according to the conditions of the coal seam.

[0039] Step S4: Water injection: Water or other liquid is delivered to the wellhead through a pipeline, and then injected into the coal seam by a water injection pump. The injection speed and pressure need to be adjusted according to the conditions of the coal seam.

[0040] Step S5, fracturing operation: while injecting water, the permeability of the coal seam can be further increased by fracturing technology, so that the gas can flow out more easily.

[0041] Step S6, production monitoring: continuously monitor the production at the wellhead and the pressure changes of the coal seam, and adjust the water injection operation according to the actual situation.

[0042] The current primary underground water injection method is the use of an integrated extraction and injection device. This device's advantage lies in injecting water directly into the coal seam using the extraction pipe, significantly reducing drilling costs. However, the extraction pipe's large diameter necessitates an adapter between the extraction pipe and the water pipe. The current adapter used underground consists of an iron casing with a diameter slightly larger than the extraction pipe. One end is welded to a quick-connect fitting that matches the injection pipe, while the other end remains untreated. To use the adapter, the extraction pipe is wrapped with sealing tape and then inserted into the large end of the adapter. The other end is connected to the injection pipe, and water is then injected into the coal seam. This design has several drawbacks: the connection between the adapter and the extraction pipe cannot withstand pressure. When injecting water at low pressure, leakage will occur at the connection, hindering construction and contaminating the tunnel with water flowing into it. When injecting water at higher pressure, the adapter and extraction pipe are at risk of detachment at any time, posing a significant safety hazard.

[0043] Combine Figures 1 to 5 As shown, according to a specific embodiment of the present application, a switching device is provided.

[0044] Specifically, if Figure 1 The adapter device shown includes: a first connecting sleeve 1, a first bushing 3, a second connecting sleeve 2, and a second bushing 4. The first connecting sleeve 1 is provided with a first inner hole 5 and a second inner hole 6, which are connected. The first inner hole 5 is located at the top of the second inner hole 6, and the annular inner part of the second inner hole 6 is provided with an internal thread. The first bushing 3 is installed in the first inner hole 5, and the interior of the first bushing 3 is connected to the extraction pipe. The second connecting sleeve 2 is located at the bottom of the first connecting sleeve 1. The end of the second connecting sleeve 2 facing the first connecting sleeve 1 is provided with an external thread section 7. The external thread section 7 is provided with an external thread that can engage with the internal thread. The external thread section 7 is provided with an installation cavity 20. The second bushing 4 is installed in the installation cavity 20. The interior of the second bushing 4 is connected to the water injection pipe. The external thread section 7 has a working position where the external thread and the internal thread are fully engaged. When the external thread section 7 is in the working position, the first bushing 3 is connected to the second bushing 4, so that the extraction pipe and the water injection pipe are connected.

[0045] By applying the technical solution of the present invention, by installing the first bushing 3 in the first inner hole 5 and the second bushing 4 in the installation cavity 20, when the external thread of the external thread section 7 in the installation cavity 20 is fully engaged with the internal thread of the second inner hole 6, the first bushing 3 and the second bushing 4 are connected, thereby connecting the extraction pipe and the water injection pipe. In addition, the first connecting sleeve 1 and the second connecting sleeve 2 are used to strengthen the structural strength of the connection and improve the pressure bearing capacity. The first bushing 3 is arranged in the first connecting sleeve 1 and the second bushing 4 is arranged in the second connecting sleeve 2 to improve the sealing performance of the adapter. The technical solution of the present application solves the technical problem that the adapter cannot withstand pressure during coal seam water injection.

[0046] Specifically, a first through hole 23 is provided inside the first bushing 3, and a second through hole 24 is provided inside the second bushing 4. When the external thread section 7 is in the working position, the external thread section 7 is completely located in the second inner hole 6, and the external thread section 7 is fully engaged with the internal thread on the inner side of the second inner hole 6. The second bushing 4 is installed in the installation cavity 20 of the external thread section 7, and the first bushing 3 is installed in the first inner hole 5. Since the external thread section 7 is fully engaged with the internal thread, and the top of the second bushing 4 in the external thread section 7 is flush with the top of the external thread section 7, and the bottom of the first bushing 3 is highly flush with the bottom of the first inner hole 5, the top surface of the second bushing 4 abuts against the bottom end surface of the first bushing 3, and the first through hole 23 and the second through hole 24 are connected, and then the threaded combination of the two connecting sleeves provides axial preload for the second bushing 4 and the first bushing 3, further improving their sealing performance and pressure bearing performance.

[0047] Specifically, if Figure 2 As shown, the first inner hole 5 is a tapered hole, and the first bushing 3 is a tapered structure, and the taper of the first inner hole 5 is the same as the taper of the first bushing 3. The tapered structure has certain advantages in terms of sealing performance. The tapered structure is characterized by being thin at the top and thick at the bottom, which can generate higher pressure on the contact surface, thereby achieving a better sealing effect. In addition, the tapered structure can be self-tightened by rotating when connected, making the connection more secure, the sealing performance more reliable, and reducing the possibility of leakage. Because the conical structure has a smaller joint area and has a better ability to withstand the pressure of the internal medium, the conical structure is often used in industrial fields that require high sealing performance, such as sealing components of equipment such as pipeline connections and valves. The above-mentioned setting scheme of this embodiment, on the one hand, reduces the difficulty of assembling the first inner hole 5 and the first bushing 3, and on the other hand, enables the contact surface of the first inner hole 5 and the first bushing 3 to bear pressure in both the axial and radial directions of the first connecting sleeve, making the connection more secure and the sealing performance more reliable.

[0048] Specifically, if Figure 3The external thread segment 7 shown is internally provided with a first stepped hole 21 and a second stepped hole 22. The first stepped hole 21 and the second stepped hole 22 are connected. The first stepped hole 21 is located at the top of the second stepped hole 22. The diameter of the first stepped hole 21 is larger than the diameter of the second stepped hole 22. The connection between the first stepped hole 21 and the second stepped hole 22 forms a first stepped structure 8. The first stepped hole 21 and the second stepped hole 22 form a mounting cavity 20. The first stepped structure 8 is used to support part of the second bushing 4. This arrangement can improve the bearing capacity and stability of the external thread segment 7. The first stepped structure 8 can effectively support part of the second bushing 4, increase the support area of the external thread segment 7 for the second bushing 4, and make the entire structure more stable. At the same time, the mounting cavity 20 formed at the connection between the first stepped hole 21 and the second stepped hole 22 can facilitate the installation and fixing of components, improving the convenience of operation. Overall, such a design can improve the service life and reliability of the external thread segment 7.

[0049] Specifically, the second bushing 4 includes a main body section and a flange 12 located at the top of the main body section. The flange 12 protrudes outward from the main body section in the radial direction of the main body section. The second bushing 4 is installed in the installation cavity 20. The flange 12 is located in the first stepped hole 21, and the bottom end surface of the flange 12 abuts the bottom wall of the first stepped hole 21. The main body section is located in the second stepped hole 22, and the bottom end surface of the main body section abuts the bottom wall of the second stepped hole 22. The provision of the flange 12 has the following advantages: 1. It can increase the top pressure contact area between the upper end of the second bushing 4 and the lower end of the first bushing 3, thereby dispersing the top pressure, reducing local pressure, and reducing stress concentration on the contact surface, thereby improving the bearing capacity and life of the contact surface; 2. It can provide additional support and reinforcement at the bottom of the first bushing 3, thereby enhancing the structural strength of the first bushing 3. This can effectively prevent the first bushing 3 from deformation, rupture and other problems during use, thereby extending its service life; 3. It can increase the stability between the second bushing 4 and the first bushing 3, making it more firm and reliable during operation, and can avoid instability caused by external forces such as vibration and impact, thereby ensuring the normal operation of the equipment.

[0050] Specifically, if Figure 4 and Figure 5 As shown, a first through hole 23 is provided inside the first bushing 3, and a second through hole 24 is provided inside the second bushing 4. When the external thread section 7 is in the working position, the upper end of the second bushing presses on the lower end of the first bushing, and the first through hole 23 and the second through hole 24 are connected.

[0051] Specifically, a connecting pipe 9 is provided inside the second connecting sleeve 2, the top end of the connecting pipe 9 is connected to the bottom end of the second through hole 24, and the bottom end of the connecting pipe 9 is connected to the water injection pipe. By configuring the connecting pipe 9, liquid can be guided from the adapter to the water injection pipe.

[0052] Optionally, the diameter of the connecting pipe 9 is smaller than the diameter of the second through hole 24 , so that the liquid passing through the second through hole 24 can be accelerated to be injected into the water injection pipe again through the connecting pipe 9 .

[0053] A quick-connect connector 10 for connecting to the mine's water pipe is fixed at the bottom of the connecting pipe 9. The quick-connect connector 10 has an open lower end with a round inner and square outer structure. Two quick-connect fixing holes 11 are provided on one side of the quick-connect connector 10. The quick-connect connector at the bottom of the connecting pipe 9 is connected to the socket of the mine's underground water injection pipe. The quick-connect connector 10 can be modified and adapted according to the socket model of the underground water injection pipe.

[0054] Quick-connect fittings are commonly used to connect and disconnect fluid transmission pipes in pipelines or piping systems. Their functions include: 1. Quick connection and disconnection: Quick-connect fittings are simple in design and easy to operate, allowing for quick connection and disconnection of pipes, saving time and labor costs; 2. Leak-proof and sealing: Quick-connect fittings typically use sealing structures such as sealing rings to ensure that pipe connections do not leak water or air; 3. Convenient maintenance and replacement: Piping systems connected using quick-connect fittings can be easily maintained and replaced, reducing downtime; 4. Multiple connection methods: Quick-connect fittings can adopt different connection methods, such as threaded connection and compression connection, according to different needs and pipe materials. In general, the function of quick-connect fittings is to simplify pipe connection operations, improve work efficiency, and ensure the safe and reliable operation of pipe systems.

[0055] Specifically, at least one of the first connecting sleeve 1, the second connecting sleeve 2, and the connecting pipe 9 is made of metal material. Metal materials generally have high strength and durability, can withstand large pressure and temperature changes, and are suitable for assembly and installation of connecting pipes or equipment. Metal materials also have good thermal conductivity and electrical conductivity, can effectively transfer heat and electrical signals, and in some specific industrial fields, metal materials can ensure the stability and reliability of the connection. The above-mentioned metal materials include but are not limited to (yellow metal, ferrous metal, non-ferrous metal, alloy, amorphous metal material, metal ceramic material). The first connecting sleeve 1, the second connecting sleeve 2, and the connecting pipe 9 are made of metal materials, which can specifically have higher strength and pressure-bearing capacity.

[0056] Specifically, at least one of the first bushing 3 and the second bushing 4 is made of nylon. Nylon is a synthetic polymer material with the following characteristics: 1. Strong wear resistance: Nylon has excellent wear resistance and can maintain its surface finish and durability for a long time; 2. Good high temperature resistance: Nylon has good high temperature resistance and can maintain stability in high temperature environments; 3. Strong chemical corrosion resistance: Nylon has strong resistance to some chemically corrosive substances and is not easily corroded; 4. High strength: Nylon has high strength and good tensile and compressive properties; 5. Lightweight: Nylon is light and easy to carry and use; 6. Good insulation: Nylon has good insulation and is suitable for some fields requiring insulation; 7. Good aging resistance: Nylon has good aging resistance and can maintain stability and strength for a long time. The first bushing 3 and the second bushing 4 are made of nylon material and have good toughness and sealing properties.

[0057] Specifically, the outer circumferences of the first and second connecting sleeves 1 and 2 are both designed to be regular hexagonal. Adopting a regular hexagonal structure on the exterior of the connecting sleeves ensures their stability and durability, while also increasing their load-bearing capacity and better protecting the connecting components and pipes. The regular hexagonal structure also offers a high degree of geometric symmetry, reducing structural deformation and stress concentration, allowing the connecting sleeves to more evenly withstand external forces. Furthermore, the regular hexagonal shape facilitates tightening with a wrench.

[0058] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0059] 1. Solve the connection problem between the underground water injection pipe and the extraction pipe, improve the reliability of the connection between the water injection pipe and the extraction pipe, avoid the risk of the adapter and the extraction pipe being separated when the water injection pressure is too high, and reduce the risk of injury from the adapter and the extraction pipe;

[0060] 2. The device has a simple structure, is easy to manufacture, and has a low production cost. When in use, it only needs to be connected to the extraction pipe and the water injection pipe.

[0061] 3. The first connecting sleeve and the second connecting sleeve are connected by threads. Tighten the threads to compact the upper sleeve and the lower sleeve to achieve the effect of firmly connecting the extraction pipe and sealing it tightly, so as to avoid water leakage in the extraction pipe, affecting construction and causing pollution.

[0062] 4. The production materials are easy to obtain, the structure is simple, the assembly is easy, the cost is low, and it is easy to repair and replace.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition to the above, it should be noted that references to "one embodiment," "another embodiment," "an embodiment," and the like in this specification refer to specific features, structures, or characteristics described in conjunction with that embodiment as being included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with any embodiment, it is intended that such feature, structure, or characteristic, when implemented in conjunction with other embodiments, also fall within the scope of the present invention.

[0065] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A switching device, characterized in that: include: A first connecting sleeve (1), wherein a first inner hole (5) and a second inner hole (6) are provided inside the first connecting sleeve (1), the first inner hole (5) and the second inner hole (6) are communicated, the first inner hole (5) is located at the top of the second inner hole (6), and an inner thread is provided on the annular interior of the second inner hole (6); A first bushing (3), the first bushing (3) is installed in the first inner hole (5), and the interior of the first bushing (3) is communicated with the extraction pipe; a second connecting sleeve (2), the second connecting sleeve (2) being located at the bottom of the first connecting sleeve (1), the second connecting sleeve (2) being provided with an external thread section (7) at one end facing the first connecting sleeve (1), the external thread section (7) being provided with an external thread that can engage with the internal thread, and the internal portion of the external thread section (7) being provided with a mounting cavity (20); a second bushing (4), the second bushing (4) being installed in the installation cavity (20), the interior of the second bushing (4) being in communication with the water injection pipe; The external thread section (7) has a working position in which the external thread and the internal thread are fully engaged. When the external thread section (7) is in the working position, the first bushing (3) is connected to the second bushing (4), so that the extraction pipe is connected to the water injection pipe.

2. The switching device according to claim 1, characterized in that: When the external thread section (7) is located at the working position, The external thread section (7) is completely located in the second inner hole (6), and the top end surface of the second bushing (4) abuts against the bottom end surface of the first bushing (3).

3. The switching device according to claim 1, characterized in that: The first inner hole (5) is a tapered hole, the first bushing (3) is a tapered structure, and the taper of the first inner hole (5) is the same as the taper of the first bushing (3).

4. The switching device according to claim 1, characterized in that: A first step hole (21) and a second step hole (22) are provided inside the external thread section (7), the first step hole (21) and the second step hole (22) are connected, the first step hole (21) is located at the top of the second step hole (22), the diameter of the first step hole (21) is larger than the diameter of the second step hole (22), a first step structure (8) is formed at the connection between the first step hole (21) and the second step hole (22), the first step hole (21) and the second step hole (22) form the installation cavity (20), and the first step structure (8) is used for supporting the second bushing (4) of the supporting part.

5. The switching device according to claim 4, characterized in that: The second bushing (4) includes a main body section and a convex edge (12) located at the top of the main body section, the convex edge (12) protrudes outward from the main body section along the radial direction of the main body section, the second bushing (4) is installed in the installation cavity (20), the convex edge (12) is located in the first step hole (21), and the bottom end surface of the convex edge (12) abuts against the bottom wall of the first step hole (21), the main body section is located in the second step hole (22), and the bottom end surface of the main body section abuts against the bottom wall of the second step hole (22).

6. The switching device according to claim 1, characterized in that: A first through hole (23) is provided inside the first bushing (3), a second through hole (24) is provided inside the second bushing (4), and when the external thread section (7) is located in the working position, the first through hole (23) and the second through hole (24) are communicated.

7. The switching device according to claim 6, characterized in that: A connecting pipe (9) is provided inside the second connecting sleeve (2), the top end of the connecting pipe (9) is connected to the bottom end of the second through hole (24), and the bottom end of the connecting pipe (9) is connected to the water injection pipe.

8. The switching device according to claim 7, characterized in that: At least one of the first connecting sleeve (1), the second connecting sleeve (2), and the connecting pipe (9) is made of metal material.

9. The switching device according to claim 8, characterized in that: At least one of the first bushing (3) and the second bushing (4) is made of nylon material.

10. The switching device according to claim 1, characterized in that: The outer circumferences of the first connecting sleeve (1) and the second connecting sleeve (2) are both arranged in a regular hexagon.

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