Metal-sealed gas production wellhead device

Abstract

The present invention relates to the technical field of underground gas production, and discloses a metal-sealed gas production wellhead device, including a main body; a housing; a filtration component for circulating and filtering the gas in the wellhead; a self-draining component for automatically discharging the impurity particles attached to the filtration component; the filtration component includes a screening device and a indexing rotation device; the screening device is used for filtering the gas impurities in the well. The metal-sealed gas production wellhead device can achieve double-layer filtration in a drum type through the provided filtration component, so as to ensure that the mined gas can filter out the impurity particles in it to a great extent and ensure the purity of the extracted gas. And by using the indexing rotation device, the indexing rotation of the circular filter cylinder can be controlled, so that the gradually blocked circular filter cylinder can be rotated, and the clean filter holes can be re-oriented towards the wellbore, thereby performing cyclic automatic anti-blocking screening and ensuring the operation stability of the gas production wellhead device.

Description

Technical Field

[0001] The present invention relates to the technical field of underground gas production, and specifically relates to a metal-sealed gas production wellhead device. Background Art

[0002] At present, the underground coal gasification project is a new field, which can effectively alleviate the current situation of domestic natural gas supply falling short of demand. However, the components of the produced gas are complex, with strong corrosiveness and high temperature, which poses a challenge for a gas production wellhead device that can resist corrosion, high temperature and has a long service life.

[0003] At present, during the use of the traditional wellhead device, that is, the Christmas tree, when extracting underground coal gas, the gas will be pumped out along with the pipeline. During the extraction of underground coal gas, the gas needs to be further filtered. However, the traditional filtering method only relies on the filter screen for initial filtering of underground sand and some impurities in the gas. Since the extraction is a long-term process, this filtering method requires the filter screen to be replaced or cleaned irregularly. Otherwise, the blockage of the filter screen will cause difficulties in internal gas suction and high pipeline pressure, which will affect the safety of the wellhead to a certain extent. Therefore, a metal-sealed gas production wellhead device is proposed to solve the above problems. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a metal-sealed gas production wellhead device, which solves the problems in the prior art that the gas inside the gas production well cannot be filtered and cleaned in a timely and effective manner, requires irregular manual replacement and maintenance, is time-consuming and laborious, and will also pose a certain degree of safety hazard to the wellhead safety.

[0006] (II) Technical Solutions

[0007] To achieve the above object, the present invention provides the following technical solutions: A metal-sealed gas production wellhead device includes a main body; a housing; a filtration component for circularly filtering the gas inside the wellhead; a self-discharge component for automatically discharging the impurity particles attached to the filtration component; the filtration component includes a screening device and a indexing rotation device; the screening device is used for filtering the gas impurities in the well; the indexing rotation device is used for controlling the indexing rotation of the internal screening device; the filtration component is arranged inside the housing, and the self-discharge component is arranged inside the main body below the screening device.

[0008] Preferably, the screening device includes a circular filter cylinder, the circular filter cylinder is rotatably connected inside the housing, and a sliding plate is slidably connected to the inner wall of the housing, and the bottom of the sliding plate abuts against the circular filter cylinder.

[0009] Preferably, a positioning plate is fixedly connected inside the housing. Two arc-shaped round rods are fixedly connected to the positioning plate. The two arc-shaped round rods are fixed inside the housing through a connecting member. An arc spring is sleeved on the surface of the arc-shaped round rod. Two ends of the arc spring are respectively connected to the sliding plate and the positioning plate.

[0010] Preferably, two groups of the arc-shaped round rods and the arc springs are provided, and the two groups of arc-shaped round rods and arc springs are symmetrically distributed with respect to the central axis of the circular filter cartridge.

[0011] Preferably, the indexing and rotating device includes a stretching connecting rod. One end of the stretching connecting rod is rotatably connected to the sliding plate. The other end of the stretching connecting rod is rotatably connected to a lifting shaft. A sliding shaft rod is fixedly connected to the lifting shaft. The sliding shaft rod is slidably connected to the main body. The bottom of the sliding shaft rod is connected to a sliding rack. A one-way device is provided on the sliding rack.

[0012] Preferably, the one-way device includes a central shaft. A connecting ring is fixedly connected to the central shaft. Four ratchet cards are rotatably connected to the connecting ring. A tension spring is connected to the ratchet card. The bottom of the tension spring is connected to the central shaft. An external gear sleeve is clamped on the ratchet card. Teeth are provided on the outer surface of the external gear sleeve. The sliding rack meshes with the teeth on the surface of the external gear sleeve. The central shaft is fixed to the side surface of the circular filter cartridge. A partition is provided inside the housing. The one-way device is located in a sealed cavity formed between the partition and the housing.

[0013] Preferably, the self-discharging component includes a rotating shaft. A plurality of blades are provided on the surface of the rotating shaft. The rotating shaft is rotatably connected inside the main body through a connecting member. A cam disk is fixedly connected to the top of the rotating shaft. A contact plate abuts against the surface of the cam disk. A pulling plate is fixedly connected to the top of the contact plate. Two guide rods are fixedly connected to one side of the pulling plate. A compression spring is sleeved on the surface of the guide rod.

[0014] Preferably, an upper sealing plate is provided inside the housing. A push plate is slidably connected to the housing. A push rod is fixedly connected to the push plate. A contraction spring is sleeved on the surface of the push rod. One end of the contraction spring is connected to the housing. The other end of the contraction spring is connected to the upper sealing plate. An accumulation box is provided below the push plate of the housing.

[0015] Preferably, one end of the push rod passes through the housing and is flush with the side surface of the upper sealing plate. A discharge groove is provided inside the accumulation box.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present invention provides a metal-sealed gas production wellhead device, which has the following

[0018] Beneficial effects:

[0019] 1. For this metal-sealed gas production wellhead device, the double-layer filtration in a drum form can be achieved through the provided filtration component, so as to ensure that the impurities in the extracted gas can be greatly filtered out, guaranteeing the purity of the extracted gas. And by using the indexing rotation device, the indexing rotation of the circular filter cartridge can be controlled, so that the gradually blocked circular filter cartridge can be rotated, and the clean filter holes are re-oriented towards the wellbore, thereby performing cyclic automatic anti-blocking screening filtration to ensure the stable operation of the gas production wellhead device.

[0020] 2. For this metal-sealed gas production wellhead device, the self-discharge component can automatically clean and discharge the screened impurities, thus ensuring the cleanliness of the internal cavity and further improving the stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a metal-sealed gas production wellhead device proposed by the present invention;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the housing of a metal-sealed gas production wellhead device proposed by the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the filtration component of a metal-sealed gas production wellhead device proposed by the present invention;

[0024] Figure 4 It is a schematic diagram of the connection structure of the lifting shaft of a metal-sealed gas production wellhead device proposed by the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the one-way device of a metal-sealed gas production wellhead device proposed by the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the self-discharge component of a metal-sealed gas production wellhead device proposed by the present invention;

[0027] Figure 7 It is a schematic diagram of the connection structure of the accumulation box of a metal-sealed gas production wellhead device proposed by the present invention.

[0028] In the figure: 1. Main body; 2. Shell; 3. Filtration assembly; 301. Circular filter cartridge; 302. Sliding plate; 303. Arc rod; 304. Arc spring; 305. Tensile connecting rod; 306. Positioning plate; 307. Lifting shaft; 308. Sliding shaft; 309. Sliding rack; 310. One-way device; 3101. External gear sleeve; 3102. Ratchet; 3103. Tension spring; 3104. Center shaft; 3105. Connecting ring; 311. Partition; 4. Self-draining assembly; 401. Rotating shaft; 402. Cam plate; 403. Pull plate; 404. Guide rod; 405. Extrusion spring; 406. Contact plate; 407. Push plate; 408. Upper sealing plate; 409. Push rod; 410. Contraction spring; 411. Accumulation box; 412. Discharge chute. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figures 1-7 A metal-sealed gas wellhead device includes a main body 1; a shell 2; a filtering component 3 for circulating and filtering the gas in the wellhead; a self-draining component 4 for automatically discharging impurity particles attached to the filtering component 3; the filtering component 3 includes a screening device and a dividing and rotating device; the screening device is used to filter gas impurities in the well; the dividing and rotating device is used to control the dividing and rotating device of the internal screening device; the filtering component 3 is arranged inside the shell 2, and the self-draining component 4 is arranged inside the main body 1 below the screening device.

[0031] In this embodiment, the filtration device includes a circular filter cartridge 301, which is rotatably connected to the interior of the housing 2. A sliding plate 302 is slidably connected to the inner wall of the housing 2, and the bottom of the sliding plate 302 abuts against the circular filter cartridge 301. The circular filter cartridge 301 performs double-layer filtration. Because of the circular filter cartridge 301, the gas passes through the circular filter cartridge 301, enters the interior of the circular filter cartridge 301, and is then discharged from the top of the circular filter cartridge 301, thus directly forming a double-layer filter screening.

[0032] Furthermore, a positioning plate 306 is fixedly connected inside the housing 2. Two arc-shaped round rods 303 are fixedly connected to the positioning plate 306. The two arc-shaped round rods 303 are fixed inside the housing 2 through a connecting member. An arc spring 304 is sleeved on the surface of the arc-shaped round rod 303. Two ends of the arc spring 304 are respectively connected to the sliding plate 302 and the positioning plate 306. Two groups of arc-shaped round rods 303 and arc springs 304 are provided, and the two groups of arc-shaped round rods 303 and arc springs 304 are symmetrically distributed with respect to the center line of the circular filter cartridge 301. The provided arc spring 304 and arc-shaped round rod 303 will provide limit sliding for the sliding plate 302, and it can only be restricted to slide along the inner walls of the circular filter cartridge 301 and the housing 2. And when the circular filter cartridge 301 is gradually blocked, the sliding plate 302 will slide along with the increase of air pressure, and taking this as power, it drives the self-rotation of the circular filter cartridge 301. When the sliding plate 302 is depressurized and reset, it will scrape and clean on the surface of the circular filter cartridge 301, self-clean the impurities attached to the circular filter cartridge 301, and finally deposit at the four corner positions of the housing 2, which is convenient for the later self-discharge component 4 to self-discharge the impurities.

[0033] Even further, the indexing and rotating device includes a stretching connecting rod 305. One end of the stretching connecting rod 305 is rotatably connected to the sliding plate 302. The other end of the stretching connecting rod 305 is rotatably connected to a lifting shaft 307. A sliding shaft rod 308 is fixedly connected to the lifting shaft 307. The sliding shaft rod 308 is slidably connected to the main body 1. The bottom of the sliding shaft rod 308 is connected to a sliding rack 309. A one-way device 310 is provided on the sliding rack 309. When the air throughput of the circular filter cartridge 301 decreases and the internal air pressure increases, at this time, the two sliding plates 302 on both sides are pushed by the increased air pressure and thus perform circular sliding along the arc-shaped round rods 303, thereby squeezing the arc spring 304. When the two sliding plates 302 slide, they will drive the upward movement of the lifting shaft 307 through the connection of the two stretching connecting rods 305. Then the lifting shaft 307 will drive the sliding shaft rod 308 to move upward, and the sliding rack 309 on the sliding shaft rod 308 will move upward accordingly. Through the meshing of the teeth with the gear, it will drive the rotation of the circular filter cartridge 301, rotate the clean filter holes above the wellhead, and re-form the filtering structure of the filter screen.

[0034] In addition, the one-way device 310 includes a central shaft 3104. A connecting ring 3105 is fixedly connected to the central shaft 3104. Four ratchet cards 3102 are rotatably connected to the connecting ring 3105. A tension spring 3103 is connected to the ratchet card 3102. The bottom of the tension spring 3103 is connected to the central shaft 3104. An external gear sleeve 3101 is clamped on the ratchet card 3102. Tooth teeth are provided on the outer surface of the external gear sleeve 3101. The sliding rack 309 meshes with the surface tooth teeth of the external gear sleeve 3101. The central shaft 3104 is fixed to the side of the circular filter cartridge 301. A partition plate 311 is provided inside the housing 2. The one-way device 310 is located in the sealed cavity formed between the partition plate 311 and the housing 2. As the arc spring 304 restores its elastic force, it will push the two sliding plates 302 to reset again, and the sliding rack 309 will also move up and reset, thereby driving the external gear sleeve 310 to rotate in the reverse direction. The reverse rotation of the external gear sleeve 3101 will not drive the rotation of the central shaft 3104 because the ratchet teeth have one-way operation. In the forward tooth state, the four ratchet cards 3102 will rotate and compress the tension spring 3103, thereby realizing forward tooth yielding.

[0035] In addition, the self-discharging component 4 includes a rotating shaft 401. A plurality of blades are provided on the surface of the rotating shaft 401. The rotating shaft 401 is rotatably connected inside the main body 1 through a connecting member. A cam disc 402 is fixedly connected to the top of the rotating shaft 401. A contact plate 406 abuts against the surface of the cam disc 402. A pull plate 403 is fixedly connected to the top of the contact plate 406. Two guide rods 404 are fixedly connected to one side of the pull plate 403. A compression spring 405 is sleeved on the surface of the guide rod 404. The rotation of the cam disc 402 will drive the lateral sliding of the contact plate 406, and then drive the lateral sliding of the pull plate 403. After that, the action of the pull plate 403 is used to clean the flocculent impurities cleaned at the corner inside the housing 2 into the accumulation box 411.

[0036] It should be noted that an upper sealing plate 408 is provided inside the housing 2. A push plate 407 is slidably connected to the housing 2. A push rod 409 is fixedly connected to the push plate 407. A compression spring 410 is sleeved on the surface of the push rod 409. One end of the compression spring 410 is connected to the housing 2, and the other end of the compression spring 410 is connected to the upper sealing plate 408. An accumulation box 411 is provided below the housing 2 at the position of the push plate 407. Considering the gas tightness, the upper sealing plate 408 is provided. When the pull plate 403 is flush with the upper sealing plate 408, the opening position below the upper sealing plate 408 will be closed, realizing the sealing between the housing 2 and the outside world, so gas will not leak. And the overall sealing of the housing 2 is also realized by the initial state of closing the discharge chute 412 by the push plate 407.

[0037] It should be noted that one end of the ejector rod 409 passes through the housing 2 and is flush with the side surface of the upper sealing plate 408. A discharge chute 412 is provided inside the accumulation box 411. Only in the flush state, when the pull plate 403 slides, can it indirectly touch the ejector rod 409, thereby synchronously driving the movement of the push plate 407, and then exposing the lower discharge chute 412. Since the discharge chute 412 is in an inclined state, impurities or dirt will automatically drain along the inclined plane.

[0038] Working principle: first, when the wellhead device is in use, the gas in the well passes through the equipment and is extracted upward from the bottom of the main body 1, and the mined gas will pass through the circular filter cartridge 301 for double filtration. Because of the circular filter cartridge 301, the gas passes through the position of the circular filter cartridge 301, enters the interior of the circular filter cartridge 301, and is then discharged from the top of the circular filter cartridge 301, so a double-layer filter screening is directly formed. After that, it enters the upper pipeline inside the main body 1, and uses the multiple valves provided on the main body 1 to control the other limiting effects of the wellhead device during operation. The wellhead device, that is, the main body 1, is provided with multiple valves with different functions, such as production valves, wax cleaning valves, and casing valves, which are all existing technical means. When the gas is extracted for a long time, a certain degree of impurities will inevitably adhere to the bottom of the circular filter cartridge 301, resulting in a gradual decrease in the air intake. The decrease in the air intake will lead to an increase in the internal air pressure. The increase in air pressure will gradually drive the sliding plate 302 to slide on the arc-shaped round rod 303. For the sake of convenience, it can be regarded as that the filter holes under the circular filter cartridge 301 are all blocked, but in fact they are not all blocked. At this time, the gas will not be able to pass through the circular filter cartridge 301 during suction, resulting in an increase in the air pressure in the space. Therefore, the sliding plates 302 on both sides are affected by the increase in air pressure and slide in a circle along the arc-shaped round rod 303, thereby squeezing the arc spring 304. When the two sliding plates 302 slide, the lifting shaft 307 will be driven to move upward through the connection of the two stretching links 305, and then the lifting shaft 307 will drive the sliding shaft 308 to move upward, and the sliding rack 309 on the sliding shaft 308 will move upward accordingly, and the engagement of the toothed gears will drive the rotation of the outer gear sleeve 3101. The inner wall of the outer gear sleeve 3101 is provided with ratchets, so when the outer gear sleeve 3101 rotates, the central shaft 3104 on the connecting ring 3105 will be driven to rotate through the four ratchets 3102, and the rotation of the central shaft 3104 will drive the rotation of the circular filter cartridge 301, so at this time the clean filter holes will rotate with the rotation of the circular filter cartridge 301 The filter element 301 is a kind of filter element with a kind of inner ring, and the inner ring 302 is a kind of filter element with a kind of inner ring. The filter element 301 is a kind of filter element with an inner ring, and the filter element 302 is a kind of filter element with an inner ring. The filter element 301 is a kind of filter element with an inner ring, and the filter element 302 is a kind of filter element with an inner ring. The filter element 301 is a kind of filter element with an inner ring, and the filter element 302 is a kind of filter element with an inner ring. The filter element 301 is a kind of filter element with an inner ring, and the filter element 302 is a kind of filter element with an inner ring. The filter element 301 is a kind of filter element with an inner ring, and the filter element 302 is a kind of filter element with an inner ring.Therefore, the principle of the overall operation process is that when the filter holes are gradually blocked or the ventilation volume gradually decreases, the internal air pressure gradually increases, which will push the two sliding plates 302 to slide. Then, through the connecting structure, it will drive the small-angle rotation of the circular filter cylinder 301, rotate the clean filter holes above the wellhead, and re-form the filtering structure of the filter screen. When the ventilation volume gradually increases, the air pressure will decrease, and the sliding plate 302 will reset, waiting for the next blockage of the filter holes to achieve the automatic filtration process of repeated rotation, without the need for the equipment to stop and the manual operation of maintenance personnel. When the sliding plate 302 resets and slides, it will scrape the surface of the circular filter cylinder 301 to clean the impurities attached to the surface of the circular filter cylinder 301. The cleaned impurity flocs will deposit inside the housing 2. As the air flows from the well bottom, it will drive the rotation of the blades, and then drive the rotation of the rotating shaft 401. After that, the cam disk 402 will rotate with the rotation of the rotating shaft 401. Since the contact plate 406 is in contact with the cam disk 402 at this time, the rotation of the cam disk 402 will drive the lateral sliding of the contact plate 406, and then drive the lateral sliding of the pull plate 403. The pull plate 403 will gradually slide to the lower position of the upper sealing plate 408. After contacting the sealing plate 408, it will contact the ejector rod 409 again in the synchronous state. Then, it will slide again to hold the ejector rod 409 for synchronous movement. The movement of the ejector rod 409 will synchronously drive the push plate 407 connected to it to move, and then expose the upper opening position of the accumulation box 411. Therefore, the impurities will be pushed into the interior of the accumulation box 411 by the sliding of the pull plate 403. Considering the gas tightness, the upper sealing plate 408 is set. When the pull plate 403 is flush with the upper sealing plate 408, it will close the opening position below the upper sealing plate 408 to achieve the sealing between the housing 2 and the outside world, so that the gas will not leak. Then, when the convex point position of the cam disk 402 gradually disengages from the contact plate 406, at this time, it will be reset by the elastic force of the contraction spring 410 and the extrusion spring 405, and will gradually push the pull plate 403 and the push plate 407 to reset, waiting for the next rotation and discharging. When the pull plate 403 resets, it is possible that the impurities are pushed into the middle position of the housing 2. Because the lower part is a circular pipeline, in fact, the impurities after cleaning will only exist in the four corner plane positions of the housing 2. When resetting and pushing, some impurities will be pushed back into the middle of the circular pipeline. As the air is sucked upward, this part of the impurities will be on the surface of the circular filter cylinder 301 again. In this case, only the next rotation cleaning of the circular filter cylinder 301 can be waited for. However, this device can achieve automatic operation without manual operation, so it is more convenient and convenient.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

Claims

1. A metal-sealed gas wellhead device, characterized in that: include Subject (1); Housing (2); A filtering component (3) is used for circulating and filtering the gas in the wellhead; A self-draining component (4) for automatically discharging foreign particles attached to the filtering component (3); The filtering component (3) includes a screening device and an indexing and rotating device; The screening device is used to filter gas impurities in the well; The indexing rotation device is used to control the indexing rotation of the internal screening device; The filtering component (3) is arranged inside the housing (2), and the self-draining component (4) is arranged inside the main body (1) and below the screening device; The screening device comprises a circular filter cartridge (301), the circular filter cartridge (301) being rotatably connected to the interior of the housing (2), a sliding plate (302) being slidably connected to the inner wall of the housing (2), and the bottom of the sliding plate (302) being in contact with the circular filter cartridge (301); A positioning plate (306) is fixedly connected to the housing (2), and two arc-shaped round rods (303) are fixedly connected to the positioning plate (306). The two arc-shaped round rods (303) are fixed to the interior of the housing (2) via a connecting piece. A circular arc spring (304) is sleeved on the surface of the arc-shaped round rod (303), and the two ends of the circular arc spring (304) are respectively connected to the sliding plate (302) and the positioning plate (306); The indexing rotation device includes a stretching connecting rod (305), one end of the stretching connecting rod (305) is rotatably connected to the sliding plate (302), the other end of the stretching connecting rod (305) is rotatably connected to the lifting shaft (307), the lifting shaft (307) is fixedly connected to a sliding shaft (308), the sliding shaft (308) is slidably connected to the main body (1), the bottom of the sliding shaft (308) is connected to a sliding rack (309), and a one-way device (310) is provided on the sliding rack (309); The one-way device (310) includes a central shaft (3104), a connecting ring (3105) fixedly connected to the central shaft (3104), four ratchet clips (3102) rotatably connected to the connecting ring (3105), a tension spring (3103) connected to the ratchet clip (3102), the bottom of the tension spring (3103) connected to the central shaft (3104), an outer tooth sleeve (3101) clamped to the ratchet clip (3102), the outer surface of the outer tooth sleeve (3101) is provided with teeth, the sliding rack (309) meshes with the surface teeth of the outer tooth sleeve (3101), the central shaft (3104) is fixed to the side of the circular filter cartridge (301), a partition (311) is provided inside the shell (2), and the one-way device (310) is located in a sealed cavity formed between the partition (311) and the shell (2).

2. The metal-sealed gas production wellhead device according to claim 1, characterized in that: The arc-shaped round rods (303) and circular arc springs (304) are provided in two groups, and the two groups of arc-shaped round rods (303) and circular arc springs (304) are symmetrically distributed about the center line of the circular filter cartridge (301).

3. The metal-sealed gas production wellhead device according to claim 1, characterized in that: The self-discharging component (4) includes a rotating shaft (401), a surface of which is provided with a plurality of blades, the rotating shaft (401) being rotatably connected to the interior of the main body (1) via a connecting piece, the top of the rotating shaft (401) being fixedly connected to a cam disc (402), the surface of the cam disc (402) being in contact with a contact plate (406), the top of the contact plate (406) being fixedly connected to a pull plate (403), one side of the pull plate (403) being fixedly connected to two guide rods (404), the surface of the guide rod (404) being sleeved with an extrusion spring (405).

4. The metal-sealed gas production wellhead device according to claim 3, characterized in that: An upper sealing plate (408) is provided inside the shell (2), a push plate (407) is slidably connected to the shell (2), a push rod (409) is fixedly connected to the push plate (407), a contraction spring (410) is sleeved on the surface of the push rod (409), one end of the contraction spring (410) is connected to the shell (2), and the other end of the contraction spring (410) is connected to the upper sealing plate (408), and an accumulation box (411) is provided on the shell (2) below the push plate (407).

5. The metal-sealed gas production wellhead device according to claim 4, characterized in that: One end of the push rod (409) passes through the housing (2) and is flush with the side surface of the upper sealing plate (408), and a discharge chute (412) is provided inside the accumulation box (411).

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