Natural gas drain valve

Abstract

The utility model discloses a natural gas drain valve which comprises an upper valve body and a lower valve body, two sides of the lower portion of the lower valve body are respectively provided with a drain port and a drain outlet, the top of the upper valve body is provided with a gas return port and a pressure gauge connector, two sides of the upper portion of the lower valve body are respectively provided with an inspection port and a first feed port, and the opposite side of the drain port is provided with a second feed port. The second feeding port is located above the sewage draining port, the first feeding port is located above the second feeding port, connecting pipes are fixed to the end of the emptying port, the end of the sewage draining port, the end of the air return port, the end of the first feeding port and the end of the second feeding port, one end of the locking device is fixedly connected with the connecting pipes, and the other end of the locking device is in threaded connection with an external pipeline. The other end of the locking device moves in the length direction of the external pipeline and achieves butt joint locking of the connecting pipe and the external pipeline, and the butt joint position of the connecting pipe and the external pipeline is connected in a sealed mode. When the connecting device is connected with an external pipeline, a large number of bolts do not need to be prepared, operation is easy, and the connecting sealing performance is good.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a natural gas steam trap. Background Art

[0002] There is a large amount of groundwater deposited in existing natural gas mines. In the process of natural gas collection, related enterprises generally let some groundwater enter the pipeline and storage tank equipment system along with the collected natural gas. These water bodies mixed in the natural gas will seriously affect the transportation, storage and transportation production efficiency of the gas pipeline and storage tank equipment system. A certain amount of water will be deposited in the natural gas storage tank. In order to ensure the quality of natural gas and improve the storage and transportation efficiency of the existing pipeline and gas tank system, the deposited water in the natural gas storage tank should be drained as much as possible.

[0003] At present, most natural gas steam traps have components such as drain ports, sewage ports, return ports, and feed ports. However, when these ports are connected to external pipelines, they are mostly connected in the form of flanges + bolts. This method requires a large number of bolts to be prepared and tightened, which is cumbersome to operate and has poor sealing performance. Utility Model Content

[0004] The utility model aims to provide a natural gas steam trap which does not require a large number of bolts to be prepared when connected to an external pipeline, is easy to operate and has good sealing performance of the connection.

[0005] In order to solve the above technical problems, the utility model adopts the following solutions:

[0006] A natural gas steam trap comprises an upper valve body and a lower valve body. A drain port and a sewage outlet are respectively arranged on both sides of the lower part of the lower valve body. A return port and a pressure gauge interface are arranged on the top of the upper valve body. An inspection port and a first feed port are respectively arranged on both sides of the upper part of the lower valve body. A second feed port is arranged on the opposite side of the drain port. The second feed port is located above the sewage outlet, and the first feed port is located above the second feed port. Connecting pipes are fixed to the ends of the drain port, the sewage outlet, the return port, the first feed port and the second feed port. A locking device is also included. One end of the locking device is fixedly connected to the connecting pipe, and the other end is threadedly connected to an external pipeline. The other end of the locking device moves along the length direction of the external pipeline and realizes the docking and locking of the connecting pipe and the external pipeline. The connecting pipe and the external pipeline are sealed at the docking point.

[0007] Due to the adoption of the above technical solution, the design of the upper valve body and the lower valve body makes the entire valve device more stable and easy to operate. The return air port and the pressure gauge interface on the top of the upper valve body allow the gas pressure in the system to be monitored and adjusted. The drain port and the sewage port on both sides of the lower part of the lower valve body, as well as the inspection port, the first feed port and the second feed port on the upper part, provide great convenience for operation and maintenance. In particular, the design of the first feed port and the second feed port makes the feeding process more flexible and efficient. The multiple groups of floats arranged inside the lower valve body are to automatically adjust the opening and closing of the valve according to the change of liquid level, thereby preventing liquid from entering the natural gas pipeline and ensuring the safe operation of the system. The design of the connecting pipe The connection between the valve and the external pipeline is more convenient and reliable. The use of the locking device, especially its ability to move along the length of the external pipeline and realize docking and locking, further enhances the stability and sealing of the connection. The sealed connection at the docking point between the connecting pipe and the external pipeline ensures that the system will not leak during operation, thereby ensuring the safety of the system. When connecting the ports of components such as the drain port, sewage port, air return port, and feed port to the external pipeline, there is no need to dock them in the form of flanges + bolts, nor is there any need to prepare a large number of bolts, let alone tighten a large number of bolts. It only needs to be moved to a locking position. The operation is simple, and the sealing after docking with the external pipeline is good.

[0008] Optionally, the locking device includes a fixed seat, a movable seat and an elastomer, the fixed seat is fixed to the circumference of the side wall of the connecting pipe, the side of the movable seat is provided with a through hole allowing the external pipe to pass through, the inner wall of the through hole is provided with an internal thread, the outer wall of the external pipe is provided with an external thread matching the internal thread, the movable seat is threadedly connected to the external pipe, one end of the elastomer is connected to the fixed seat, and the other end is movably connected to the movable seat, the movable seat moves in a direction away from the connecting pipe and stretches the elastomer to achieve docking and locking of the connecting pipe and the external pipe.

[0009] Optionally, the elastic body is provided in plurality and is evenly distributed in a ring shape between the fixed seat and the movable seat.

[0010] Optionally, a fixing plate is provided at one end of the plurality of elastic bodies away from the fixing seat, and the fixing plate is rotatably connected to the movable seat.

[0011] Optionally, the fixing plate is circular, and a hole is provided in the middle of the fixing plate to allow the external pipe to pass through, and the diameter of the hole is larger than the outer diameter of the external pipe.

[0012] Optionally, the sides of the fixed plate opposite to the movable seat are respectively provided with a sliding block and a sliding groove that match each other, the sliding rail is slidably embedded in the sliding groove, and the sliding groove limits the lateral displacement of the sliding block, and the sliding groove is an annular through groove.

[0013] Optionally, the slider is annular, the cross-sections of the slider and the slide groove are both circular, a connecting plate is provided between the slider and the fixed plate, and the opening of the slide groove allows the connecting plate to pass through.

[0014] Optionally, the movable seat is hexagonal or pentagonal.

[0015] Optionally, the end of the connecting pipe that docks with the external pipe has an outer bevel, a sealing ring is embedded in the inclined surface, and multiple sealing rings are arranged at intervals along the inclination direction of the outer bevel. The end of the external pipe that docks with the connecting pipe has an inner bevel that matches the outer bevel, and the end of the connecting pipe with the outer bevel is inserted into the end of the external pipe with the inner bevel to achieve docking.

[0016] Optionally, the upper valve body and the lower valve body are fastened together by bolts, and a base with anchor bolts is provided at the bottom of the lower valve body.

[0017] The utility model has the beneficial effects:

[0018] 1. In the utility model, when the drain valve is docked with the external pipeline, the locking device can move along the length direction of the external pipeline and realize the docking locking function, thereby enhancing the stability and sealing of the connection. The sealed connection at the docking point between the connecting pipe and the external pipeline ensures that the system will not leak during operation, thereby ensuring the safety of the system. When the ports of the drain port, sewage port, air return port, feed port and other components are connected to the external pipeline, there is no need to dock them in the form of flange + bolts, nor is there any need to prepare a large number of bolts, let alone tighten a large number of bolts. It only needs to be moved to a locking position, which is simple to operate and has good sealing after docking with the external pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram before the connecting pipe is connected to the external pipeline;

[0021] Figure 3 It is a structural schematic diagram after the connecting pipe is connected to the external pipeline;

[0022] Figure 4 It is the assembly cross-sectional structure diagram of the fixed plate and the movable seat;

[0023] Figure 5 A schematic diagram of the structure of the slider.

[0024] Figure markings: 1-return air port, 2-inspection port, 3-lower valve body, 4-drain port, 5-base, 6-anchor bolt, 7-drain port, 8-second feed port, 9-external pipeline, 10-external thread, 11-movable seat, 12-fixed plate, 13-elastic body, 14-fixed seat, 15-connecting pipe, 16-first feed port, 17-upper valve body, 18-pressure gauge interface, 19-external bevel, 20-inner bevel, 21-sealing ring, 22-connecting plate, 23-slide groove, 24-slider, 25-inner thread, 26-through hole, 27-channel. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0026] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0027] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example

[0029] A natural gas steam trap comprises an upper valve body 17 and a lower valve body 3. A drain port 4 and a sewage outlet 7 are respectively arranged on both sides of the lower part of the lower valve body 3. A return port 1 and a pressure gauge interface 18 are respectively arranged on the top of the upper valve body 17. An inspection port 2 and a first feed port 16 are respectively arranged on both sides of the upper part of the lower valve body 3. A second feed port 8 is arranged on the opposite side of the drain port 4. The second feed port 8 is located above the sewage outlet 7. The first feed port 16 is located above the second feed port 8. Connecting pipes 15 are fixed to the ends of the drain port 4, the sewage outlet 7, the return port 1, the first feed port 16 and the second feed port 8. A locking device is also included. One end of the locking device is fixedly connected to the connecting pipe 15, and the other end is threadedly connected to the external pipe 9. The other end of the locking device moves along the length direction of the external pipe 9 and realizes the docking and locking of the connecting pipe 15 and the external pipe 9. The docking part of the connecting pipe 15 and the external pipe 9 is sealed.

[0030] In this embodiment, Figure 1 As shown, the upper valve body 17 and the lower valve body 3 are connected by bolts, and a base 5 with anchor bolts 6 is provided at the bottom of the lower valve body 3. The design of the upper valve body 17 and the lower valve body 3 makes the entire valve device more stable and easy to operate. The return air port 1 and the pressure gauge interface 18 at the top of the upper valve body 17 allow the gas pressure in the system to be monitored and adjusted. The drain port 4 and the sewage port 7 on both sides of the lower part of the lower valve body 3, as well as the inspection port 2, the first feed port 16 and the second feed port 8 at the upper part, provide great convenience for operation and maintenance. In particular, the design of the first feed port 16 and the second feed port 8 makes the feeding process more flexible and efficient. The design of the connecting pipe 15 makes the valve and The connection of the external pipeline 9 is more convenient and reliable. The use of the locking device, especially its ability to move along the length direction of the external pipeline 9 and realize the docking and locking function, further enhances the stability and sealing of the connection. The sealed connection at the docking point between the connecting pipe 15 and the external pipeline 9 ensures that the system will not leak during operation, thereby ensuring the safety of the system. The ports of components such as the drain port 4, the sewage port 7, the return air port 1, and the feed port no longer need to be docked in the form of flange + bolts when connected to the external pipeline 9, nor do they need to prepare a large number of bolts, let alone tighten a large number of bolts. They only need to be moved to a locking state, which is simple to operate and has good sealing after docking with the external pipeline 9.

[0031] Furthermore, the locking device includes a fixed seat 14, a movable seat 11 and an elastomer 13. The fixed seat 14 is fixed to the circumference of the side wall of the connecting pipe 15. The side of the movable seat 11 is provided with a through hole 26 allowing the external pipe 9 to pass through. The inner wall of the through hole 26 is provided with an internal thread 25. The outer wall of the external pipe 9 is provided with an external thread 10 that matches the internal thread 25. The movable seat 11 is threadedly connected to the external pipe 9. One end of the elastomer 13 is connected to the fixed seat 14, and the other end is movably connected to the movable seat 11. The movable seat 11 moves in a direction away from the connecting pipe 15 and stretches the elastomer 13 to achieve docking and locking of the connecting pipe 15 and the external pipe 9.

[0032] Specifically, the locking device is composed of a fixed seat 14, a movable seat 11 and an elastic body 13. The fixed seat 14 is firmly installed on the circumference of the side wall of the connecting pipe 15, providing basic support for the locking device. The movable seat 11 is a key part of the locking device. Its side is provided with a through hole 26 that allows the external pipe 9 to pass through. The inner wall of the through hole 26 is designed with an internal thread 25. The internal thread 25 matches the external thread 10 provided on the outer wall of the external pipe 9, so that the movable seat 11 can be threadedly connected with the external pipe 9. The elastic body 13 is located between the fixed seat 14 and the movable seat 11, one end of which is connected to the fixed seat 14, and the other end is movably connected to the movable seat 11. When the movable seat 11 moves relative to the fixed seat 14, the elastic body 13 will undergo corresponding expansion and contraction deformation. Figure 2 As shown, in the initial state, the movable seat 11 is located near the connecting pipe 15, and the elastic body 13 is in a natural state. When the connecting pipe 15 needs to be connected with the external pipe 9, the external pipe 9 is first inserted into the through hole 26 of the movable seat 11, and the external thread 10 of the external pipe 9 is matched with the internal thread 25 of the movable seat 11 by rotation. As the external pipe 9 is further screwed in, the movable seat 11 moves away from the connecting pipe 15 and stretches the elastic body 13, as shown in FIG. Figure 3As shown, when the movable seat 11 moves to a certain position, the elastomer 13 will be fully stretched and generate a certain pre-tightening force. This pre-tightening force forms a tight threaded connection between the movable seat 11 and the external pipe 9, thereby realizing the docking and locking of the connecting pipe 15 and the external pipe 9. Through the threaded connection and the pre-tightening force of the elastomer 13, the locking device can achieve a stable connection and is not prone to loosening or leakage. The sealed connection between the movable seat 11 and the connecting pipe 15, and the threaded connection between the external pipe 9 and the movable seat 11, together ensure the high sealing of the system. The connection process can be completed by simply inserting the external pipe 9 into the through hole 26 of the movable seat 11 and rotating it. There is no need to tighten a large number of bolts. The operation is simple and quick. The locking device is suitable for external pipes 9 of different specifications and materials, and has strong adaptability. In summary, the locking device in the natural gas steam trap valve device ensures the stability and sealing of the connection between the valve and the external pipe 9 through its unique design and working principle, providing important guarantee for the safe operation of the natural gas transmission system.

[0033] Furthermore, the elastic body 13 is provided in multiple numbers and is evenly distributed in a ring shape between the fixed seat 14 and the movable seat 11 .

[0034] Specifically, the fixed seat 14 is firmly mounted on the circumference of the side wall of the connecting pipe 15, providing a stable support for the entire locking device. The side of the movable seat 11 is provided with a through hole 26 allowing the external pipe 9 to pass through, and its inner wall is designed with an internal thread 25 to match the external thread 10 of the external pipe 9. The movable seat 11 can move relative to the fixed seat 14 to achieve docking and locking with the external pipe 9. The elastic body 13 is provided with a plurality of elastic bodies 13, and the plurality of elastic bodies 13 are evenly distributed in an annular shape between the fixed seat 14 and the movable seat 11. This distribution method ensures that the locking device can be evenly stressed when subjected to external force, thereby improving its stability and reliability. In the initial state, the movable seat 11 is located in the connecting pipe. Near the connecting pipe 15, the elastic body 13 is in a natural state. When the connecting pipe 15 needs to be docked with the external pipe 9, the external pipe 9 is first inserted into the through hole 26 of the movable seat 11, and the external thread 10 of the external pipe 9 is matched with the internal thread 25 of the movable seat 11 by rotation. As the external pipe 9 is further screwed in, the movable seat 11 will move away from the connecting pipe 15 and stretch the elastic body 13. When the movable seat 11 moves to a certain position, multiple elastic bodies 13 will be evenly stretched and generate a certain pre-tightening force. This pre-tightening force forms a tight threaded connection between the movable seat 11 and the external pipe 9, thereby achieving docking and locking of the connecting pipe 15 and the external pipe 9. Since the elastic bodies 13 are evenly distributed in an annular shape, the locking device can be evenly stressed when subjected to external force, thereby improving its stability.

[0035] Furthermore, a fixing plate 12 is provided at one end of the plurality of elastic bodies 13 away from the fixing seat 14 , and the fixing plate 12 is rotatably connected to the movable seat 11 .

[0036] Specifically, one end of the multiple elastomers 13 away from the fixed seat 14 is connected and fixed to the fixed plate 12, and the fixed plate 12 and the movable seat 11 are connected in a rotating manner, which means that when the movable seat 11 moves relative to the fixed seat 14, the fixed plate 12 can rotate relative to the movable seat 11. In the initial state, the movable seat 11 is located near the connecting pipe 15, the elastomer 13 is in a natural state, and the fixed plate 12 maintains a certain initial angle with the movable seat 11. When the connecting pipe 15 needs to be docked with the external pipe 9, the external pipe 9 is first inserted into the through hole 26 of the movable seat 11, and the external thread 10 of the external pipe 9 is matched with the internal thread 25 of the movable seat 11 by rotation. As the external pipe 9 is further screwed in, the movable seat 11 will move away from the connecting pipe 15 and stretch the elastomer 13. In this process, since the fixed plate 12 and the movable seat 11 are connected in a rotating manner, the fixed plate 12 can be rotated relative to the movable seat 11 to adapt to the shape change of the elastomer 13 during the stretching process. When the movable seat 11 moves to a certain position, multiple elastomers 13 will be evenly stretched and generate a certain pre-tightening force. This pre-tightening force forms a tight threaded connection between the movable seat 11 and the external pipe 9, thereby realizing the docking and locking of the connecting pipe 15 and the external pipe 9.

[0037] Furthermore, the fixing plate 12 is circular, and a hole 27 is provided in the middle of the fixing plate 12 to allow the external pipe 9 to pass through, and the diameter of the hole 27 is larger than the outer diameter of the external pipe 9 .

[0038] Specifically, Figure 5 As shown, the fixed plate 12 is circular, and a hole 27 is provided in the middle of the fixed plate 12 to allow the external pipe 9 to pass through. The diameter of the hole 27 is larger than the outer diameter of the external pipe 9 to ensure that the external pipe 9 can pass through smoothly without being stuck or generating excessive friction. One end of the fixed plate 12 is connected to the end of the elastomer 13 away from the fixed seat 14, and the other end is rotatably connected to the movable seat 11. This connection method allows the fixed plate 12 to rotate to a certain extent relative to the movable seat 11 when the elastomer 13 is stretched to adapt to changes in the connection process.

[0039] Furthermore, the sides of the fixed plate 12 opposite to the movable seat 11 are respectively provided with a slider 24 and a slide groove 23 adapted to each other, the slide rail is slidably embedded in the slide groove 23, and the slide groove 23 limits the lateral displacement of the slider 24, and the slide groove 23 is an annular through groove.

[0040] Furthermore, the slider 24 is annular, and the cross sections of the slider 24 and the slide groove 23 are both circular. A connecting plate 22 is provided between the slider 24 and the fixed plate 12, and the opening of the slide groove 23 allows the connecting plate 22 to pass through.

[0041] Specifically, Figure 4 and Figure 5 As shown, an annular slider 24 is provided on the side opposite to the fixed plate 12 and the movable seat 11, and the cross section of the slider 24 is circular. The slider 24 is connected to the fixed plate 12 by a connecting plate 22, and the connecting plate 22 allows the slider 24 to move within a certain range on the fixed plate 12. An annular groove 23 adapted to the slider 24 is provided on the side opposite to the fixed plate 12 of the movable seat 11, and the cross section of the groove 23 is also circular, and its opening allows the connecting plate 22 to pass through. The design of the groove 23 ensures that the slider 24 can be smoothly embedded and slide therein, while limiting the lateral displacement of the slider 24. When the connecting pipe 15 needs to be connected with the external pipe 9, the external pipe 9 is first inserted into the through hole 26 of the movable seat 11 and the hole in the middle of the fixed plate 12, and the external thread 10 of the external pipe 9 is matched with the internal thread 25 of the movable seat 11 by rotation. As the external pipe 9 is further screwed in, the movable seat 11 will move away from the connecting pipe 15. During this process, the slider 24 slides in the slide groove 23 to ensure the stable movement of the movable seat 11.

[0042] Further, the movable seat 11 is hexagonal or pentagonal. Specifically, the movable seat 11 is designed to be hexagonal or pentagonal, and its edge can provide a larger contact surface, which is convenient for using tools or manual rotation operation.

[0043] Furthermore, the end of the connecting pipe 15 that is docked with the external pipe 9 has an outer bevel 19, and a sealing ring 21 is embedded in the inclined surface. A plurality of sealing rings 21 are arranged at intervals along the inclination direction of the outer bevel 19. The end of the external pipe 9 that is docked with the connecting pipe 15 has an inner bevel 20 that is adapted to the outer bevel 19. One end of the connecting pipe 15 with the outer bevel 19 is inserted into the other end of the external pipe 9 with the inner bevel 20 to achieve docking.

[0044] Specifically, Figure 2As shown, one end of the connecting pipe 15 has an outer bevel 19, and a plurality of sealing rings 21 are embedded on the outer bevel 19. These sealing rings 21 are arranged at intervals along the inclined direction of the outer bevel 19 to form a tight sealing surface. The end of the external pipe 9 and the connecting pipe 15 is designed with an inner bevel 20 adapted to the outer bevel 19 of the connecting pipe 15. When the connecting pipe 15 is inserted into the external pipe 9, the two bevels will fit tightly to achieve preliminary docking. The sealing ring 21 is embedded in the outer bevel 19 of the connecting pipe 15 to provide an additional sealing effect when the connecting pipe 15 is docked with the external pipe 9. These sealing rings 21 are usually made of elastic material to ensure that they can fit tightly during the docking process to prevent gas leakage. Initial state: In the initial state, the movable seat 11 is located near the connecting pipe 15, the elastomer 13 is in a natural state, and the slider 24 is embedded in the slide groove 23. Docking process: When the connecting pipe 15 needs to be docked with the external pipe 9, firstly, the connecting pipe 1 5 The end with the outer bevel 19 is inserted into the end with the inner bevel 20 of the external pipe 9. At this time, the outer bevel 19 of the connecting pipe 15 and the inner bevel 20 of the external pipe 9 will fit tightly, and the docking is initially realized. Rotation locking: Subsequently, the movable seat 11 is rotated to make its internal thread 25 match the external thread 10 of the external pipe 9. During the rotation process, the movable seat 11 will move away from the connecting pipe 15, stretching the elastic body 13. At the same time, the slider 24 slides in the slide groove 23 to ensure the stable movement of the movable seat 11. Locking state: When the movable seat 11 is rotated to a certain position, multiple elastic bodies 13 will be evenly stretched and generate a certain pre-tightening force. At this time, the outer bevel 19 of the connecting pipe 15 and the inner bevel 20 of the external pipe 9 are tightly fitted under the action of the sealing ring 21. At the same time, the internal thread 25 of the movable seat 11 and the external thread 10 of the external pipe 9 are also tightly connected, thereby ensuring the tightness and sealing between the connecting pipe 15 and the external pipe 9. The tight fit between the outer bevel 19 of the connecting tube 15 and the inner bevel 20 of the external pipe 9, as well as the function of multiple sealing rings 21, ensure the sealing of the docking point and effectively prevent gas leakage. The docking and locking process can be completed by rotating the movable seat 11, and the operation is simple and convenient.

[0045] The above is only a preferred embodiment of the utility model and does not limit the utility model in any form. According to the technical essence of the utility model, within the spirit and principles of the utility model, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the utility model.

Claims

1. A natural gas steam trap, comprising an upper valve body (17) and a lower valve body (3), characterized in that: A drain port (4) and a sewage outlet (7) are respectively arranged on both sides of the lower part of the lower valve body (3); a return port (1) and a pressure gauge interface (18) are respectively arranged on the top of the upper valve body (17); an inspection port (2) and a first feed port (16) are respectively arranged on both sides of the upper part of the lower valve body (3); a second feed port (8) is arranged on the opposite side of the drain port (4); the second feed port (8) is located above the sewage outlet (7); the first feed port (16) is located above the second feed port (8); the drain port (4) and The ends of the sewage outlet (7), the air return outlet (1), the first feed outlet (16), and the second feed outlet (8) are all fixed with connecting pipes (15), and also include a locking device, one end of the locking device is fixedly connected to the connecting pipe (15), and the other end is threadedly connected to the external pipe (9), and the other end of the locking device moves along the length direction of the external pipe (9) to achieve docking and locking of the connecting pipe (15) and the external pipe (9), and the docking point of the connecting pipe (15) and the external pipe (9) is sealed.

2. The natural gas steam trap according to claim 1, characterized in that: The locking device comprises a fixed seat (14), a movable seat (11) and an elastic body (13); the fixed seat (14) is fixed to the circumference of the side wall of the connecting pipe (15); a through hole (26) is provided on the side of the movable seat (11) for allowing the external pipe (9) to pass through; an internal thread (25) is provided on the inner wall of the through hole (26); an external thread (10) matching the internal thread (25) is provided on the outer wall of the external pipe (9); the movable seat (11) is threadedly connected to the external pipe (9); one end of the elastic body (13) is connected to the fixed seat (14) and the other end is movably connected to the movable seat (11); the movable seat (11) moves in a direction away from the connecting pipe (15) and stretches the elastic body (13) to achieve docking and locking of the connecting pipe (15) and the external pipe (9).

3. The natural gas steam trap according to claim 2, characterized in that: The elastic bodies (13) are provided in plurality and are evenly distributed in an annular shape between the fixed seat (14) and the movable seat (11).

4. The natural gas steam trap according to claim 3, characterized in that: A fixing plate (12) is provided at one end of the plurality of elastic bodies (13) away from the fixing seat (14), and the fixing plate (12) is rotatably connected to the movable seat (11).

5. The natural gas steam trap according to claim 4, characterized in that: The fixing plate (12) is circular, and a hole (27) is provided in the middle of the fixing plate (12) for allowing the external pipe (9) to pass through, and the diameter of the hole (27) is larger than the outer diameter of the external pipe (9).

6. The natural gas steam trap according to claim 5, characterized in that: The sides of the fixed plate (12) and the movable seat (11) opposite to each other are respectively provided with a sliding block (24) and a sliding groove (23) adapted to each other, the sliding rail is slidably embedded in the sliding groove (23), and the sliding groove (23) limits the lateral displacement of the sliding block (24), and the sliding groove (23) is an annular through groove.

7. The natural gas steam trap according to claim 6, characterized in that: The slider (24) is annular, and the cross sections of the slider (24) and the slide groove (23) are both circular. A connecting plate (22) is provided between the slider (24) and the fixed plate (12), and the opening of the slide groove (23) allows the connecting plate (22) to pass through.

8. The natural gas steam trap according to claim 2, characterized in that: The movable seat (11) is hexagonal or pentagonal.

9. The natural gas steam trap according to claim 1, characterized in that: The end of the connecting pipe (15) that is butt-jointed with the external pipe (9) has an outer bevel (19), a sealing ring (21) is embedded in the bevel, and a plurality of sealing rings (21) are arranged at intervals along the bevel direction of the outer bevel (19). The end of the external pipe (9) that is butt-jointed with the connecting pipe (15) has an inner bevel (20) that matches the outer bevel (19), and one end of the connecting pipe (15) having the outer bevel (19) is inserted into one end of the external pipe (9) having the inner bevel (20) to achieve butt-jointing.

10. The natural gas steam trap according to claim 1, characterized in that: The upper valve body (17) and the lower valve body (3) are fastened together by bolts, and a base (5) with anchor bolts (6) is provided at the bottom of the lower valve body (3).

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