An automatic valve for coal bed methane formation testing

Abstract

The utility model discloses an automatic valve for coal bed gas stratum test, specifically relates to coal bed gas stratum test technical field, include: the valve body, the both sides symmetry of valve body are provided with the air pipe, and the bottom side of valve body is connected with the air pipe, and the inside of two air pipes is provided with the passageway, the inside sliding connection spool of valve body. The utility model discloses through setting spool and passageway, spool both sides symmetry is equipped with limit hole, plugs ball and connecting column, and under the cooperation of elastic support subassembly, when spool is sealed in the both sides passageway between the descent in valve body, under the elastic effect of multiple first spring and second spring, can make the plug ball reset and project limit hole and be in the opening end inner wall of passageway and be pressed tightly, to further can further seal the passageway tightly, under the pressing tightly seal of two plugs ball, can further greatly strengthen the sealing performance of automatic valve, has improved the use effect of automatic valve greatly.

Description

Technical Field

[0001] This utility model relates to the field of coalbed methane formation testing technology, specifically to an automatic valve for coalbed methane formation testing. Background Technology

[0002] Coalbed methane (CBM) formations refer to geological strata containing CBM, typically located within coal-bearing strata. CBM is an unconventional natural gas resource, primarily composed of methane, stored in the pores and fractures of coal seams. CBM formation testing is a crucial method for obtaining coal reservoir parameters; common methods include drill pipe testing and injection or pressure drop methods.

[0003] Currently, when conducting coalbed methane formation testing, automatic valves are usually required to control the opening and closing of connecting pipelines. However, existing valves mainly achieve channel sealing through valve cores. Since the valve cores are often designed to be lifting, it is difficult to effectively ensure a tight seal between the valve core wall and the inlet / outlet when closing the channel, which can easily create gaps and lead to water or gas infiltration, greatly affecting the sealing performance of the valve. Utility Model Content

[0004] The purpose of this invention is to provide an automatic valve for coalbed methane formation testing. By configuring a valve core and channels, the valve core is symmetrically equipped with limiting holes, plug balls, and connecting columns on both sides. With the cooperation of an elastic support assembly, when the valve core descends within the valve body and blocks the channels on both sides, the elastic action of multiple sets of first and second springs allows the plug balls to reset, extend out of the limiting holes, and press against the inner wall of the channel opening. This further seals the channels tightly. The tight sealing effect of the two plug balls significantly enhances the sealing performance of the automatic valve, greatly improving its performance and overcoming the aforementioned shortcomings in the technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic valve for coalbed methane formation testing, comprising:

[0006] The valve body has symmetrically arranged air outlet pipes on both sides and an air inlet pipe connected to the bottom side of the valve body. Both air outlet pipes have channels inside.

[0007] The valve body has a slidingly connected valve core inside, and a driving assembly is provided on the valve body. The driving assembly is used to drive the valve core to move. The valve core has a cavity groove inside, and an elastic support assembly is provided inside the cavity groove. The valve core has symmetrically opened limiting holes facing the channel on both sides. A connecting post is embedded inside the limiting hole. One end of each of the two connecting posts is connected to a plug ball extending outside the limiting hole, and the other end of each of the two connecting posts is connected to the elastic support assembly. The outer wall of the plug ball abuts against the opening end of the channel.

[0008] Preferably, the elastic support assembly includes a fixed rod fixedly connected to the middle of the cavity, with movable sliders symmetrically arranged at both ends of the fixed rod, and a first spring sleeved at the middle end of the fixed rod. The two ends of the first spring are respectively fixedly connected to the two sliders, and the two ends of the two sliders are symmetrically connected to the connecting column through a rotating shaft with two connecting arms.

[0009] Preferably, a second spring is fitted at both ends of the fixing rod, one end of the second spring is fixedly connected to the slider, and the other end of the second spring is fixedly connected to the valve core.

[0010] Preferably, the slider has symmetrical sliding pillars at both ends, and the cavity has sliding grooves on both sides, with one end of the sliding pillar slidingly engaged in the sliding groove.

[0011] Preferably, the drive assembly includes a cylinder fixedly connected to the top of the valve body, the output end of the cylinder extending into the valve body and connected to the valve core.

[0012] Preferably, the outer wall of the cylinder is provided with a protective cover.

[0013] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0014] By setting the valve core and channels, the valve core is symmetrically provided with limiting holes, plug balls and connecting columns on both sides. With the cooperation of the elastic support components, when the valve core descends in the valve body and blocks between the two channels, the plug balls can be reset and extended out of the limiting holes and pressed against the inner wall of the opening end of the channel under the elastic action of multiple sets of first and second springs. This can further seal the channel tightly. Under the tight sealing of the two plug balls, the sealing performance of the automatic valve can be greatly enhanced, and the use effect of the automatic valve can be greatly improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a longitudinal sectional view of the present invention;

[0018] Figure 3 This is one of the schematic diagrams of the internal structure of the valve core of this utility model;

[0019] Figure 4 This is the second schematic diagram of the internal structure of the valve core of this utility model.

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

[0021] 1. Valve body; 2. Outlet pipe; 3. Inlet pipe; 4. Channel; 5. Cylinder; 6. Protective cover; 7. Valve core; 8. Plug ball; 9. Cavity groove; 10. Fixing rod; 11. Sliding block; 12. First spring; 13. Second spring; 14. Connecting arm; 15. Connecting column; 16. Limiting hole; 17. Slide groove; 18. Slide column. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] This utility model provides, for example Figures 1-4 An automatic valve for coalbed methane formation testing is shown, comprising:

[0024] The valve body 1 has air outlet pipes 2 symmetrically arranged on both sides, and an air inlet pipe 3 is connected to the bottom side of the valve body 1. Both air outlet pipes 2 have channels 4 inside.

[0025] The valve body 1 has a sliding connection to the valve core 7 inside, and the valve body 1 is provided with a drive assembly for driving the valve core 7 to move. The valve core 7 has a cavity 9 inside, and an elastic support assembly is provided inside the cavity 9. The valve core 7 has symmetrical limit holes 16 facing the channel 4 on both sides. The limit holes 16 are embedded with connecting posts 15. One end of each of the two connecting posts 15 is connected to a ball plug 8 extending outside the limit hole 16, and the other end of each of the two connecting posts 15 is connected to the elastic support assembly. The outer wall of the ball plug 8 abuts against the opening end of the channel 4.

[0026] The drive assembly includes a cylinder 5 fixedly connected to the top of the valve body 1. The output end of the cylinder 5 extends into the valve body 1 and is connected to the valve core 7. Based on this, by activating the cylinder 5, the cylinder 5 can drive the valve core 7 to move up and down within the valve body 1. When the valve core 7 descends and moves between the two channels 4, the valve can be closed; conversely, the valve can be opened.

[0027] A protective cover 6 is provided on the outer wall of the cylinder 5. Based on this, the cylinder 5 can be protected by the protective cover 6.

[0028] The elastic support assembly includes a fixed rod 10 fixedly connected to the middle of the cavity 9. Movable sliders 11 are symmetrically arranged at both ends of the fixed rod 10, and a first spring 12 is sleeved at the middle end of the fixed rod 10. The two ends of the first spring 12 are fixedly connected to the two sliders 11 respectively. The two ends of the two sliders 11 are symmetrically connected to the connecting column 15 through a rotating shaft, and there are two connecting arms 14.

[0029] A second spring 13 is fitted at both ends of the fixed rod 10. One end of the second spring 13 is fixedly connected to the slider 11, and the other end of the second spring 13 is fixedly connected to the valve core 7.

[0030] In use, the valve core 7 can be driven to descend within the valve body 1 by the drive assembly. At this time, the plug balls 8 on both sides are squeezed into the limiting hole 16 by the inner wall of the valve body. Then, the plug balls 8 can drive the connecting column 15 to move, so that the connecting column 15 drives the two sliders 11 to slide back and forth on the fixed rod 10 through the connecting arm 14. Then, the two sliders 11 can stretch the first spring 12 and squeeze the second springs 13 at both ends. When the valve core 7 moves between the two channels 4, under the elastic rebound of the first spring 12 and the second spring 13, the plug balls 8 can be reset, extend out of the limiting hole 16 and press against the inner wall of the opening end of the channel 4, thereby further sealing the channel 4 tightly. Under the tight sealing of the two plug balls 8, the sealing performance of the automatic valve can be greatly enhanced, and the use effect of the automatic valve can be greatly improved.

[0031] The slider 11 has symmetrical sliding posts 18 at both ends, and the cavity 9 has sliding grooves 17 on both sides. One end of the sliding post 18 is slidably engaged in the sliding groove 17. Based on this, by setting the sliding post 18 and the sliding groove 17, the slider 11 can drive the sliding post 18 to move along the sliding groove 17, thereby greatly ensuring the stable movement of the slider 11.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automatic valve for coalbed methane formation testing, characterized in that, include: The valve body (1) has air outlet pipes (2) symmetrically arranged on both sides, and an air inlet pipe (3) is connected to the bottom side of the valve body (1). Both air outlet pipes (2) have channels (4) inside. The valve body (1) is internally connected to the valve core (7), and the valve body (1) is provided with a drive assembly. The drive assembly is used to drive the valve core (7) to move. The valve core (7) has a cavity (9) inside, and an elastic support assembly is provided inside the cavity (9). The valve core (7) has symmetrically opened limiting holes (16) facing the channel (4) on both sides. The limiting holes (16) are embedded with connecting posts (15). One end of each of the two connecting posts (15) is connected to a ball (8) extending outside the limiting hole (16), and the other end of each of the two connecting posts (15) is connected to the elastic support assembly. The outer wall of the ball (8) abuts against the opening end of the channel (4).

2. An automatic valve for coalbed methane formation testing according to claim 1, characterized in that: The elastic support assembly includes a fixed rod (10) fixedly connected in the middle of the cavity (9). The fixed rod (10) has movable sliders (11) symmetrically arranged at both ends. A first spring (12) is sleeved at the middle end of the fixed rod (10). The two ends of the first spring (12) are fixedly connected to the two sliders (11) respectively. The two ends of the two sliders (11) are symmetrically connected to the connecting column (15) through a rotating shaft, and there are two connecting arms (14).

3. An automatic valve for coalbed methane formation testing according to claim 2, characterized in that: Both ends of the fixed rod (10) are fitted with second springs (13). One end of the second spring (13) is fixedly connected to the slider (11), and the other end of the second spring (13) is fixedly connected to the valve core (7).

4. An automatic valve for coalbed methane formation testing according to claim 2, characterized in that: The slider (11) has symmetrical sliding pillars (18) at both ends, and the cavity (9) has sliding grooves (17) on both sides. One end of the sliding pillar (18) is slidably fitted in the sliding groove (17).

5. An automatic valve for coalbed methane formation testing according to claim 1, characterized in that: The drive assembly includes a cylinder (5) fixedly connected to the top of the valve body (1), the output end of the cylinder (5) extending into the valve body (1) and connected to the valve core (7).

6. An automatic valve for coalbed methane formation testing according to claim 5, characterized in that: The outer wall of the cylinder (5) is provided with a protective cover (6).

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