Rotary air joint improvement device and method

By installing push-pull joints and high-pressure insulated pipes at the rotary gas joints, the problems of difficulty in replacing rotary gas joints and inconvenient maintenance in winter are solved, a faster and safer maintenance process is achieved, and the maintenance cost is reduced.

CN119778561APending Publication Date: 2025-04-08HUANENG YIMIN COAL POWER CO LTD
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Patent Information

Application Number
CN202411661300.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-20
Publication Date
2025-04-08

AI Technical Summary

Technical Problem

The existing rotary gas joints are difficult to replace, and the fault treatment time is long, especially in winter, and the maintenance workers are inconvenient to operate in cold environments, which is prone to frostbite.

Method used

By removing the traditional rotary rotary gas joints, installing a new push-pull joint to weld the equipment slewing body, the gas pipeline will be connected to the new push-pull joint in the future, and the high-pressure insulated pipe will be wrapped on the outside of the upper air duct to separate the upper and lower air ducts to achieve the setting of the gas access system.

Benefits of technology

It solves the problem of many faults in the rotary gas joint, reduces replacement and repair time, reduces maintenance costs, avoids the risk of frostbite, and does not need to disassemble the high-pressure ring for repair.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a rotary gas joint improvement device and method, and the method comprises the steps: removing a traditional rotary rotary gas joint, then installing a new push-pull joint, welding the new push-pull joint on an equipment rotary body, and connecting an incoming gas pipeline to the new push-pull joint; an air pipe connector is arranged on a new push-pull type connector, and the upper portion of an upper air pipe is connected with the air pipe connector. The outer side of the upper air pipe is wrapped with the high-voltage insulation pipe, and the high-voltage insulation pipe penetrates through the high-voltage ring. According to the rotary air connector improvement device and method, the size of the rotary air connector is small, and the installation position is beneficial to replacement and maintenance; the high-pressure ring does not need to be detached when the rotary air connector is replaced, the replacement and maintenance time is greatly saved, equipment does not stop when the rotary air connector is replaced, the maintenance environment is not particularly cold due to the original starting temperature of the equipment, and the probability of frostbite of maintenance workers is greatly reduced.
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Description

Technical Field

[0001] The invention relates to the technical field of gas pipeline connection equipment, and in particular to an improved device and method for a rotary gas joint. Background Art

[0002] The rotating gas joint of mechanical equipment is the key interface connecting the gas supply source at the top of the equipment and the gas-using parts at the bottom of the equipment. Its main function is to maintain the continuity and stability of the gas supply when the equipment rotates or moves, thereby ensuring that the gas-using parts at the bottom of the equipment can work normally.

[0003] At present, the existing rotary gas joints are difficult to replace and take a long time to handle. Most of the failures occur in the coldest time of winter. When handling the failures, all power must be cut off and all high-voltage rings must be removed. The lifting is difficult, the risk factor is high, and the maintenance conditions are harsh. In particular, the failures of rotary gas joints often occur in winter, and the installation screws of rotary gas joints are relatively small. It is not easy for maintenance workers to operate them in winter wearing thick cotton gloves, but if maintenance workers operate with bare hands in the cold winter, frostbite is very likely to occur. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problems that the rotary gas joints of the above-mentioned existing rotary gas joint improvement device and method are difficult to replace, the fault handling time is long, and the faults often occur during the coldest time in winter. When handling the faults, all power must be cut off, the high-voltage rings must be completely removed, the lifting is difficult, and the risk factor is high, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: by removing the traditional rotary rotating gas joint, and then installing a new push-pull joint and welding it on the rotating body of the equipment, the future gas pipeline is connected to the new push-pull joint; by setting a duct joint on the new push-pull joint, the upper part of the upper duct and the duct joint are connected together; by wrapping a high-voltage insulating tube on the outside of the upper duct, and passing the high-voltage insulating tube through the high-voltage ring, and then setting a joint at the lower end of the upper duct for connecting the lower duct, the setting of the gas access system is completed.

[0007] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, the push-pull joint is designed to be quickly connected and disconnected to facilitate maintenance and replacement of the equipment.

[0008] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, the high-voltage insulating tube is made of high-temperature and high-voltage resistant materials to meet the needs of different working environments.

[0009] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, a sealing ring is provided at the connection head of the upper air duct and the lower air duct to ensure the sealing during the gas transmission process and prevent gas leakage.

[0010] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, a filtering device is provided between the push-pull joint and the air duct joint to purify the gas entering the system and prevent impurities from damaging the equipment.

[0011] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, the entire system is equipped with an automatic detection device that can monitor gas flow and pressure in real time, and automatically alarm or close the gas circuit under abnormal circumstances to ensure the safe operation of the system.

[0012] The beneficial effects of the first implementation scheme of the present invention: it solves the problem of many failures of the original rotary gas joint; the rotary gas joint of this scheme is small in size, and the installation position is convenient for replacement and maintenance; there is no need to remove the high-pressure ring when replacing the rotary gas joint, which greatly saves the replacement and maintenance time, and the equipment can be replaced without stopping, and the original startup temperature of the equipment is used to prevent the maintenance environment from being particularly cold, which greatly reduces the probability of frostbite for maintenance workers; and the purchase cost of the push-type rotary gas joint is low, which greatly saves the company's maintenance costs.

[0013] Since the mounting screws of the above-mentioned existing rotary gas joints are relatively small, it is not easy for maintenance workers to operate them wearing thick cotton gloves in winter. However, if maintenance workers operate them with bare hands in cold winter, frostbite is very likely to occur.

[0014] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0015] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, the gas transmission system includes a basic component, a connecting component arranged on the basic component, and a conveying pipeline arranged on the connecting component.

[0016] As a preferred solution of the rotary gas joint improvement device and method described in the present invention, the basic component includes an equipment rotating body, a high-pressure ring arranged on the lower side of the equipment rotating body, a prior art joint arranged on the lower side of the high-pressure ring, and a prior art pipeline arranged on the prior art joint.

[0017] As a preferred solution of the rotary air joint improvement device and method described in the present invention, the connecting assembly includes a new type joint arranged on the lower side of the equipment rotating body, an air outlet arranged on the lower side of the new type joint, an air duct joint arranged on the air outlet, and an intermediate joint arranged on the lower side of the high-pressure ring.

[0018] As a preferred embodiment of the improved device and method of the rotary gas joint of the present invention, the delivery pipeline includes an incoming air pipeline arranged on the new joint, an upper air duct arranged on the air duct joint, a high-voltage insulating pipe arranged on the outside of the upper air duct, and a lower air duct arranged on the intermediate joint; the other end of the intermediate joint is arranged on the lower side of the upper air duct.

[0019] The beneficial effects of the present invention are as follows: by replacing the original technical joint with a new joint, and moving the original joint to the lower side of the equipment rotating body, and then separating the upper air duct and the lower part pipe through the middle joint, when leakage occurs again, it is only necessary to disassemble the corresponding joint for repair and replacement, without disassembling the high-pressure ring, eliminating the work of disassembling the high-pressure ring, achieving the effect of facilitating maintenance, and when replacing in winter, frostbite can also be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the original structure of the improved device of the rotary gas joint of the present invention.

[0022] Figure 2 It is a schematic diagram of the improved structure of the rotary gas joint improved device of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0025] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0026] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0027] Example 1, reference Figure 1-2 , which is the first embodiment of the present invention, provides a method for improving a rotary gas joint, which includes removing the traditional rotary gas joint, installing a new push-pull joint and welding it on the rotating body of the equipment, and connecting the future gas pipeline to the new push-pull joint.

[0028] Among them, the traditional rotary rotating gas joint is connected to the lower side of the high-pressure ring. When the joint is damaged, the high-pressure ring needs to be disassembled together, and the process of disassembling the high-pressure ring is relatively cumbersome. By installing a new push-pull joint to separate the joint and the high-pressure ring, there is no need to disassemble the high-pressure ring during disassembly, which greatly reduces the workload of maintenance.

[0029] Furthermore, an air duct joint is arranged on the new push-pull joint, and then the upper part of the upper air duct and the air duct joint are connected together.

[0030] Among them, by arranging an air duct joint on the push-pull joint and connecting it with the upper air duct, it can be ensured that the transmission of gas from the gas source to the upper air duct and then to other parts inside the equipment is continuous.

[0031] Furthermore, by wrapping a high-voltage insulating tube on the outside of the upper air duct and passing the high-voltage insulating tube through the high-voltage ring, a joint is set at the lower end of the upper air duct for connecting to the lower air duct, thereby completing the setting of the gas access system.

[0032] Among them, the high-voltage insulating tube is wrapped on the outside of the upper air duct to provide electrical insulation and protection. A joint is set at the lower end of the upper air duct to connect the upper air duct with the lower air duct to form a complete gas transmission path. Through the above steps, the setting of the gas access system is completed. This system is from the gas source to the push-pull joint, then to the upper air duct, and finally connected to the lower air duct through the joint, forming a continuous, safe and efficient gas transmission channel.

[0033] Preferably, the setting of the two joints completely separates the rotating gas joint and the high-pressure ring. During maintenance, only the corresponding joints need to be repaired and replaced without disassembling the high-pressure ring, which greatly reduces the workload and saves maintenance time.

[0034] In summary: the problem of many failures of the original rotary gas joint has been solved; the rotary gas joint of this solution is small in size, and the installation position is convenient for replacement and maintenance; there is no need to remove the high-pressure ring when replacing the rotary gas joint, which greatly saves the replacement and maintenance time, and the equipment can be replaced without stopping, and the original startup temperature of the equipment is used, so the maintenance environment will not be particularly cold, which greatly reduces the probability of frostbite for maintenance workers; and the purchase cost of the push-on rotary gas joint is low, which greatly saves the company's maintenance costs.

[0035] Example 2, reference Figure 2 , which is the second embodiment of the present invention, is the second embodiment of the present invention, and provides a method for improving a rotary gas joint, which includes: the push-pull joint is designed to be quickly connected and disconnected to facilitate maintenance and replacement of the equipment.

[0036] Among them, when maintaining equipment or replacing parts, the push-pull connector can be quickly connected or disconnected, saving operation time. At the same time, it can also be operated without stopping during replacement, greatly saving maintenance time. In order to facilitate connection, the two ends of the push-pull connector are usually designed as matching male and female interfaces, which can be quickly connected.

[0037] Furthermore, the high-voltage insulating tube is made of high-temperature-resistant and high-voltage-resistant materials to meet the needs of different working environments.

[0038] Among them, high-voltage insulating tubes usually use materials that can withstand high temperatures; the design and material selection of the insulating tubes must be able to withstand the high voltage in the system without breakdown, and the materials must have high insulation resistance to ensure that no leakage occurs during long-term use.

[0039] Furthermore, a sealing ring is provided at the connection head between the upper air duct and the lower air duct to ensure the sealing during the gas transmission process and prevent gas leakage.

[0040] Among them, the sealing ring can fill the tiny gaps in the connection to prevent gas leakage during transmission and ensure the normal operation of the system; and it is designed through a new push-pull joint, which can be quickly replaced through the push-pull joint in the event of damage.

[0041] Furthermore, a filtering device is provided between the push-pull joint and the air duct joint to purify the gas entering the system and prevent impurities from damaging the equipment.

[0042] Among them, the filtering device can remove impurities such as dust, particulate matter, oil mist, etc. from the gas entering the system to ensure the cleanliness of the gas. Impurities may wear or clog the inside of the equipment, such as fans, heaters or air conditioning components, and the filtering device can prevent this from happening.

[0043] Furthermore, the entire system is equipped with an automatic detection device that can monitor gas flow and pressure in real time, and automatically alarm or shut down the gas line under abnormal circumstances to ensure the safe operation of the system.

[0044] Among them, the automatic detection device includes a flow sensor, a pressure sensor and a control system, which detects the air pressure and flow inside the pipeline in real time.

[0045] Preferably, when a gas leak is detected causing a rapid drop in internal air pressure, the system can quickly identify and trigger an alarm, or automatically close the gas line in severe cases to prevent accidents and ensure the safety of operators and equipment.

[0046] In summary: the push-pull connector is designed to achieve quick connection and disconnection, which is convenient for equipment maintenance and replacement, saves operation time and supports non-stop operation; the male and female interface design of the connector makes the connection simple and quick; at the same time, the high-voltage insulation tube made of high-temperature and high-voltage resistant materials is adapted to different working environments to prevent breakdown and leakage; the sealing ring at the air duct connector ensures the sealing of gas transmission, prevents leakage, and can be quickly replaced through the push-pull connector. The setting of the filter device purifies the gas to prevent impurities from damaging the inside of the equipment; the automatic detection device equipped with the system monitors the gas flow and pressure in real time, and automatically alarms or closes the gas line under abnormal conditions to ensure safe operation and reliable equipment operation, which improves the economic benefits and operational convenience of the system as a whole.

[0047] Example 3, reference Figure 1-2 , which is the third embodiment of the present invention, provides a rotary gas joint improvement device, which includes: a gas transmission system 100, including a basic component 101, a connecting component 102 arranged on the basic component 101, and a conveying pipeline 103 arranged on the connecting component 102.

[0048] Among them, the basic component 101 refers to the gas transmission route on the unimproved equipment rotating body 101a, the setting of the connecting component 102 refers to the improved gas connecting equipment, and the setting of the delivery pipeline 103 is used to facilitate the formation of a gas loop so that the equipment can operate normally.

[0049] Furthermore, the basic component 101 includes an equipment rotating body 101a, a high-pressure ring 101b arranged on the lower side of the equipment rotating body 101a, a prior art joint 101c arranged on the lower side of the high-pressure ring 101b, and a prior art pipeline 101d arranged on the prior art joint 101c.

[0050] Among them, the equipment rotor 101a is the rotating part of the mechanical equipment, which usually undertakes the main rotational motion and power transmission functions; the high-pressure ring 101b is an annular component installed on the lower side of the equipment rotor 101a, which is used to fix and support the high-pressure gas transmission system; the prior art connector 101c refers to a technical product that has been widely used and mature in the market, which is used to connect the high-pressure ring 101b and other gas transmission components; the prior art pipeline 101d refers to a pipeline system connected to the connector, which is used to actually transport the gas.

[0051] In addition, the joint 101c and the high-pressure ring 101b in the prior art are connected together, which is very troublesome during disassembly, and the high-pressure ring 101b needs to be disassembled together, which is very troublesome.

[0052] Furthermore, the connection assembly 102 includes a new joint 102a arranged on the lower side of the equipment rotating body 101a, an air outlet 102b arranged on the lower side of the new joint 102a, an air duct joint 102c arranged on the air outlet 102b, and an intermediate joint 102d arranged on the lower side of the high-pressure ring 101b.

[0053] Among them, the new joint 102a is a component specially designed to replace or improve the existing joint 101c. It is arranged on the lower side of the equipment rotating body 101a, and mainly adopts a new push-type connection, which is relatively convenient to disassemble; the air outlet 102b is a component connected to the lower side of the new joint 102a, which is used to connect the upper pipeline and guide the gas from the inside of the equipment to the outside; the air duct joint 102c is arranged below the air outlet 102b for connecting to the external air duct system; the intermediate joint 102d is located on the lower side of the high-pressure ring 101b, which is used to connect the upper air duct 103b and the lower branch pipe, completely separating the joint and the high-pressure ring 101b, so that the high-pressure ring 101b does not need to be disassembled for maintenance.

[0054] Furthermore, the delivery pipeline 103 includes an incoming air pipeline 103a arranged on the new joint 102a, an upper air duct 103b arranged on the air duct joint 102c, a high-voltage insulating tube 103c arranged on the outside of the upper air duct 103b, and a lower air duct 103d arranged on the middle joint 102d; the other end of the middle joint 102d is arranged on the lower side of the upper air duct 103b.

[0055] Among them, the incoming gas pipe 103a is a pipe connected to the new joint 102a, and it is the first section of the pipe for gas to enter the system; the upper air duct 103b is a pipe arranged on the air duct joint 102c, which is located at the upper part of the system and is used to continue to transport the gas from the incoming gas pipe 103a; the high-voltage insulating tube 103c is wrapped around the outside of the upper air duct 103b, and its function is to provide electrical insulation to prevent the risk of electric shock caused by high-pressure gas leakage; the lower air duct 103d is a pipe arranged on the middle joint 102d, which is located at the lower part of the system and is used to transport gas from the upper air duct 103b to other parts of the system or the final destination.

[0056] Preferably, the new joint 102a is installed on the lower side of the equipment rotating body 101a, and is easy to disassemble and install quickly through a push-type connection. The air outlet 102b is connected thereto to guide the internal gas of the equipment to the outside; the air duct joint 102c is located below the air outlet 102b and is responsible for docking with the external air duct system. The intermediate joint 102d is located on the lower side of the high-pressure ring 101b, connecting the upper air duct 103b and the lower air duct 103d, so as to achieve efficient transmission of gas without disassembling the high-pressure ring 101b. The delivery pipeline 103 is composed of an incoming gas pipeline 103a, an upper air duct 103b, a high-voltage insulating pipe 103c and a lower air duct 103d, which are connected in sequence with the new joint 102a, the air duct joint 102c and the intermediate joint 102d to form an efficient and safe transmission path from the gas entering the system to being transported to the destination.

[0057] In summary: by replacing the original technical joint with the new joint 102a, and moving the original joint to the lower side of the equipment rotating body 101a, and then separating the upper air duct 103b and the lower air duct 103d through the middle joint 102d, when leakage occurs again, it is only necessary to disassemble the corresponding joint for repair and replacement, without disassembling the high-pressure ring 101b. The work of disassembling the high-pressure ring 101b is eliminated, which makes maintenance easier. When replacing in winter, frostbite can also be prevented.

[0058] The remaining structure is the same as that of Example 2.

[0059] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0060] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for improving a rotary gas joint, characterized in that: include, S1. Remove the traditional rotary gas joint, install a new push-pull joint and weld it on the rotating body of the equipment, and connect the gas pipeline to the new push-pull joint; S2. By setting a duct joint on the new push-pull joint, connecting the upper part of the upper duct and the duct joint together; and, S3. The gas access system is set up by wrapping a high-voltage insulating tube on the outside of the upper air duct, passing the high-voltage insulating tube through the high-voltage ring, and then setting a joint at the lower end of the upper air duct for connecting the lower air duct.

2. The method for improving a rotary gas joint according to claim 1, characterized in that: The push-pull connector is designed to be quickly connected and disconnected to facilitate maintenance and replacement of equipment.

3. The method for improving a rotary gas joint according to claim 2, characterized in that: The high-voltage insulating tube is made of high-temperature-resistant and high-voltage-resistant materials to meet the needs of different working environments.

4. The method for improving a rotary gas joint according to claim 3, characterized in that: A sealing ring is provided at the connection head of the upper air duct and the lower air duct to ensure the sealing during the gas transmission process and prevent gas leakage.

5. The method for improving a rotary gas joint according to claim 4, characterized in that: A filtering device is provided between the push-pull joint and the air duct joint to purify the gas entering the system and prevent impurities from damaging the equipment.

6. The method for improving a rotary gas joint according to claim 5, characterized in that: The entire system is equipped with an automatic detection device that can monitor gas flow and pressure in real time, and automatically alarm or shut down the gas line under abnormal circumstances to ensure the safe operation of the system.

7. An improved rotary gas joint device, characterized in that: A method for improving a rotary gas joint comprising any one of claims 1 to 6, and: A gas transmission system (100) comprises a basic component (101), a connecting component (102) arranged on the basic component (101), and a transmission pipeline (103) arranged on the connecting component (102).

8. The improved rotary gas joint device according to claim 7, characterized in that: The basic component (101) comprises an equipment rotating body (101a), a high-pressure ring (101b) arranged on the lower side of the equipment rotating body (101a), a prior art joint (101c) arranged on the lower side of the high-pressure ring (101b), and a prior art pipeline (101d) arranged on the prior art joint (101c).

9. The improved rotary gas joint device according to claim 8, characterized in that: The connection assembly (102) comprises a new type joint (102a) arranged on the lower side of the equipment rotating body (101a), an air outlet (102b) arranged on the lower side of the new type joint (102a), an air duct joint (102c) arranged on the air outlet (102b), and an intermediate joint (102d) arranged on the lower side of the high-pressure ring (101b).

10. The improved rotary gas joint device according to claim 9, characterized in that: The delivery pipeline (103) comprises an incoming air pipeline (103a) arranged on the new joint (102a), an upper air duct (103b) arranged on the air duct joint (102c), a high-voltage insulating pipe (103c) arranged outside the upper air duct (103b), and a lower air duct (103d) arranged on the middle joint (102d); The other end of the middle joint (102d) is arranged on the lower side of the upper air duct (103b).