A pilot two-stage cascade control structure

Abstract

A pilot two-stage connection control structure, comprising a valve body and a driving assembly installed in the valve body, the valve body is formed with a gas inlet and a gas outlet connected with each other, and the driving assembly is provided with a valve plug assembly for controlling the opening and closing of the gas outlet; characterized in that the valve plug assembly comprises a two-stage valve plug and a one-stage valve plug penetrating the middle part of the two-stage valve plug, a pilot channel is formed between the one-stage valve plug and the two-stage valve plug; the end of the one-stage valve plug is provided with a connecting ring for controlling the opening of the two-stage valve plug, and the end of the one-stage valve plug is sleeved with a sealing ring for blocking the pilot channel; compared with the prior art, by setting the one-stage valve plug in the middle part of the two-stage valve plug, a pilot channel for pressure relief is formed between the one-stage valve plug and the two-stage valve plug, the delayed opening of the two-stage valve plug during the opening of the one-stage valve plug can be realized, and the pressure relief effect is realized through the pilot channel.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a pilot-operated two-stage control structure. Background Technology

[0002] The motor valve for gas meters is one of the core control components of smart gas meters. It is responsible for automatically opening or cutting off the gas supply under remote commands or preset conditions. It is used to realize the safe switching of gas meters, cost management, home safety inspection and user management. It realizes the remote on and off of gas by driving the valve core through a low-power motor. It has key characteristics such as high reliability, high sealing performance, low power consumption and safe shutdown in case of power failure.

[0003] Existing gas meter motor valves are limited by the torque output of the motor during operation, making them only suitable for small-diameter and low-pressure gas pipelines. When gas meters need to be installed in large-diameter or high-pressure gas pipelines, the valve plug size of the gas meter motor valve inevitably increases due to the larger diameter. As a result, the force-bearing area of ​​the valve plug increases during use. However, the torque output of the motor in the existing gas meter motor valve is insufficient to drive the valve plug to open. Therefore, the existing gas meter motor valves cannot meet the requirements of large-diameter and high-pressure applications.

[0004] Chinese patent CN216715332U discloses a gas direct-flow valve with a pressure relief mechanism, including a valve body, a controller, a power cord, and a transparent cover; the transparent cover is disposed above the valve body, and the controller for controlling internal parts is disposed above the valve body, with a power cord connected to a power source installed on the right side of the controller; it also includes a delivery pipe and a pressure gauge, both disposed above the valve body, and a gas pipe for transporting gas is engaged on the left side of the valve body; an outer ring is disposed between the valve body and the gas pipe, and an inner ring is disposed inside the outer ring.

[0005] The aforementioned method of controlling the movement of the limit plate by setting a spring to regulate the pressure in the gas pipeline is difficult to apply to the motor valve of the gas pipeline in large-diameter, high-pressure, and closed conditions. Utility Model Content

[0006] The present invention aims to overcome the defects in the prior art and provide a simple, safe and reliable pilot-operated two-stage control structure with pilot-operated pressure relief.

[0007] To achieve the above-mentioned utility model objectives, the present utility model adopts the following technical solution: a pilot-operated two-stage control structure, comprising a valve body and a drive assembly installed within the valve body, wherein the valve body forms a gas inlet and a gas outlet connected in communication, and the drive assembly is provided with a valve plug assembly for controlling the opening or closing of the gas outlet; characterized in that the valve plug assembly comprises a secondary valve plug and a primary valve plug passing through the middle of the secondary valve plug, wherein a pilot channel is formed between the primary valve plug and the secondary valve plug; the end of the primary valve plug is provided with a connecting ring for controlling the opening of the secondary valve plug, and the end of the primary valve plug is fitted with a sealing ring for sealing the pilot channel.

[0008] As a preferred embodiment of the present invention, the primary valve plug includes a valve sleeve body that is controlled to extend and retract by a drive assembly, a connecting ring is sleeved on the end of the valve sleeve body, and an installation groove for fitting a sealing ring is formed on the valve sleeve body.

[0009] As a preferred embodiment of this utility model, the valve sleeve body has a connector head for snapping onto the connecting ring at its end, and the secondary valve plug has a through hole in the middle to facilitate the connection head passing through, with the connecting ring being larger than the through hole.

[0010] As a preferred embodiment of this utility model, an abutment ring is formed on the valve sleeve body along the circumferential direction of the valve sleeve body, and a mating groove corresponding to the abutment ring is formed in the middle of the secondary valve plug.

[0011] As a preferred embodiment of this utility model, the connector, mounting groove and abutment ring are arranged sequentially inward along the end of the valve sleeve body.

[0012] As a preferred embodiment of this utility model, the cross-sectional diameters formed by the connector, the mounting groove, and the abutment ring increase sequentially.

[0013] In a preferred embodiment of this utility model, the sealing ring installed in the mounting groove abuts against the abutting ring.

[0014] As a preferred embodiment of the present invention, the secondary valve plug includes a valve plug support and a snap ring formed on the valve plug support, a through hole is formed in the middle of the valve plug support, and a valve plug body for opening or closing the gas outlet is installed on the snap ring.

[0015] In a preferred embodiment of this utility model, the distance between the sealing ring and the connecting ring is greater than the thickness of the valve plug bracket at the location of the through hole.

[0016] As a preferred embodiment of this utility model, the snap ring is further provided with a valve plug retaining ring for stably mounting the valve plug body onto the snap ring.

[0017] Compared with existing technologies, by setting a primary valve plug in the middle of the secondary valve plug, a pilot channel for pressure relief is formed between the primary and secondary valve plugs. This allows for delayed opening of the secondary valve plug during the opening of the primary valve plug, thereby achieving pressure relief through the pilot channel. This satisfies the valve opening operation in environments with a high pressure difference between the gas inlet and outlet, thus improving the valve's adaptability to various pressure environments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the pilot channel opening; Figure 3 This is a structural diagram of the primary valve plug and the secondary valve plug; Figure 4 These are exploded views of the primary valve plug and the secondary valve plug; Figure 5 This is a structural schematic diagram of a primary valve plug. Figure 6 This is a cross-sectional view of the primary valve plug. Figure 7 This is a schematic diagram of the structure of the secondary valve plug; Reference numerals: Valve body 1, Gas inlet 11, Gas outlet 12, Drive assembly 2, Valve plug assembly 3, Pilot channel 4, First-stage valve plug 5, Valve sleeve body 51, Connector 52, Mounting groove 53, Abutment ring 54, Second-stage valve plug 6, Sealing ring 7, Valve plug bracket 8, Through hole 81, Snap ring 82, Valve plug body 83, Valve plug retaining ring 84, Mating groove 85, Connecting ring 9. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] like Figures 1-7 As shown, a pilot-operated two-stage control structure includes a valve body 1 and a drive assembly 2 installed in the valve body 1. The valve body 1 has a gas inlet 11 and a gas outlet 12 that are connected. The drive assembly 2 is provided with a valve plug assembly 3 for controlling the opening or closing of the gas outlet 12. The valve plug assembly 3 includes a secondary valve plug 6 and a primary valve plug 5 that passes through the middle of the secondary valve plug 6. A pilot channel 4 is formed between the primary valve plug 5 and the secondary valve plug 6. The end of the primary valve plug 5 is provided with a connecting ring 9 for controlling the opening of the secondary valve plug 6, and the end of the primary valve plug 5 is fitted with a sealing ring 7 for sealing the pilot channel 4.

[0021] The gas inlet 11 and gas outlet 12 of the valve body 1 are both connected to the gas pipeline. Under the driving action of the drive component 2, the position of the valve plug component 3 in the valve body 1 is controlled. Thus, the movement of the valve plug component 3 controls the opening or closing of the gas outlet 12, thereby realizing the control of the connection state of the two gas pipelines connected to the valve body 1 under the action of the valve body 1.

[0022] The drive assembly 2 drives the first valve plug 5 to extend and retract. During the retraction of the first valve plug 5, the connecting ring 9 drives the second-stage valve plug 6 to retract, thereby opening the gas outlet 12. Under the extension of the first valve plug 5, the sealing ring 7 abuts against the second-stage valve plug 6, thereby blocking the pilot channel 4. At the same time, it drives the second-stage valve plug 6 to press against the valve body 1, thereby closing the gas outlet 12.

[0023] The primary valve plug 5 includes a valve sleeve body 51 that is controlled to extend and retract by the drive assembly 2, a connecting ring 9 is sleeved on the end of the valve sleeve body 51, and an installation groove 53 for fitting the sealing ring 7 is formed on the valve sleeve body 51.

[0024] The valve sleeve body 51 is connected to the drive assembly 2, and the valve sleeve body 51 and the drive assembly 2 can be connected by a screw and a screw sleeve. Under the rotation of the screw driven by the drive assembly 2, and while the screw is always in a relatively stationary state, the valve sleeve body 51 can be extended and retracted, thereby realizing the extension and retraction control of the valve sleeve body 51.

[0025] The valve sleeve body 51 has a connector 52 at its end for engaging the connecting ring 9, and the secondary valve plug 6 has a through hole 81 in the middle to facilitate the connection of the connector 52. The size of the connecting ring 9 is larger than the size of the through hole 81.

[0026] The connector 52 passes through the secondary valve plug 6, and the diameter of the valve sleeve body 51 where the mounting groove 53 is located is larger than the size of the through hole 81. Therefore, after installation, the connecting ring 9 and the sealing ring 7 are located on opposite sides of the secondary valve plug 6, and both the connecting ring 9 and the sealing ring 7 are larger than the size of the through hole 81. Thus, during the extension and retraction of the valve sleeve body 51, the connecting ring 9 and the sealing ring 7 are simultaneously extended and retracted, and the connecting ring 9 or the sealing ring 7 respectively drives the opening or closing of the secondary valve plug 6.

[0027] A contact ring 54 is formed on the valve sleeve body 51 along the circumferential direction of the valve sleeve body 51, and a mating groove 85 is formed in the middle of the secondary valve plug 6 to engage with the contact ring 54.

[0028] The abutment ring 54 and the mating groove 85 are designed to increase the contact area between the primary valve plug 5 and the secondary valve plug 6 when both the primary valve plug 5 and the secondary valve plug 6 are in the closed state, thereby improving the stability of the primary valve plug 5 and the secondary valve plug 6 in the closed state.

[0029] The connector 52, mounting groove 53 and abutment ring 54 are arranged in sequence along the end of the valve sleeve body 51, and the cross-sectional diameter formed by the connector 52, mounting groove 53 and abutment ring 54 increases sequentially.

[0030] Ensure that the valve sleeve body 51 has only the connector 52 passing through the secondary valve plug 6, so as to meet the setting requirements that the connecting ring 9 and the sealing ring 7 are located on opposite sides of the secondary valve plug 6.

[0031] The sealing ring 7 installed in the mounting groove 53 abuts against the abutting ring 54. The abutting ring 54 is used to increase the contact area with the secondary valve plug 6, while the abutting ring 54 abuts against the back of the sealing ring 7, thereby supporting the sealing ring 7 when blocking the pilot channel 4 and ensuring the stability of the sealing ring 7.

[0032] The secondary valve plug 6 includes a valve plug support 8 and a snap ring 82 formed on the valve plug support 8. A through hole 81 is formed in the middle of the valve plug support 8. A valve plug body 83 for opening or closing the gas outlet 12 is installed on the snap ring 82. The valve plug body 83 is larger than the size of the gas outlet 12. The valve plug body 83 is used to abut against the inner wall of the valve body 1 at the gas outlet 12, thereby achieving a sealing closure of the gas outlet 12 under the action of the valve plug body 83.

[0033] The distance between the sealing ring 7 and the connecting ring 9 is greater than the thickness of the valve plug bracket 8 at the location of the through hole 81, ensuring that at most one of the sealing ring 7 and the connecting ring 9 is in contact with the valve plug bracket 8, thus meeting the communication requirements of the pilot channel 4.

[0034] The retaining ring 82 is also equipped with a valve plug retaining ring 84 for stably mounting the valve plug body 83 onto the retaining ring 82.

[0035] In actual use, when it is necessary to close the gas outlet 12, the drive component 2 drives the first-stage valve plug 5 to extend outward. During the extension of the first-stage valve plug 5, the sealing ring 7 moves synchronously. After the sealing ring 7 moves a certain distance, it abuts against the second-stage valve plug 5, thereby driving the second-stage valve plug 5 to move synchronously until the second-stage valve plug 5 abuts against the inner wall of the valve body 1 at the gas outlet 12. Under the action of the second-stage valve plug 5, the gas outlet 12 is closed, and under the action of the sealing ring 7, the pilot channel 4 between the first-stage valve plug 5 and the second-stage valve plug 5 is blocked, thereby realizing the connection and disconnection of the gas outlet 12 between the gas inlet 11 and the gas outlet 12.

[0036] When the gas outlet 12 needs to be opened, the drive component 2 drives the first-stage valve plug 5 to retract inward. During the retraction of the first-stage valve plug 5, the connecting ring 9 moves synchronously. The connecting ring 9 drives the second-stage valve plug 5 to move synchronously, so that the connection between the second-stage valve plug 5 and the inner wall of the valve body 1 is disengaged, and the gas outlet 12 between the gas inlet 11 is connected.

[0037] When the pressure difference between the gas inlet 11 and the gas outlet 12 is large, the pilot channel 4 can be used to relieve pressure, thereby reducing the opening resistance of the secondary valve plug 6 and improving the valve's adaptability to various pressure environments. When the primary valve plug 5 switches from the blocking state to the retracting state, the sealing ring 7 disengages from the secondary valve plug 5, and the connecting ring 9 does not abut against the secondary valve plug 5. At this time, the pilot channel 4 is in the connected state, achieving pressure relief. As the primary valve plug 5 further retracts, the connecting ring 9 drives the secondary valve plug 5 to move synchronously, causing the connection between the secondary valve plug 5 and the inner wall of the valve body 1 to disengage, thus achieving the connection between the gas outlet 12 and the gas inlet 11.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0039] Although this document frequently uses reference numerals from the accompanying drawings, such as valve body 1, gas inlet 11, gas outlet 12, drive assembly 2, valve plug assembly 3, pilot channel 4, primary valve plug 5, valve sleeve body 51, connector 52, mounting groove 53, abutment ring 54, secondary valve plug 6, sealing ring 7, valve plug bracket 8, through hole 81, snap ring 82, valve plug body 83, valve plug retaining ring 84, mating groove 85, and connecting ring 9, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A pilot-operated two-stage control structure, comprising a valve body (1) and a drive assembly (2) installed within the valve body (1), wherein the valve body (1) has a gas inlet (11) and a gas outlet (12) that are connected to each other, and the drive assembly (2) is provided with a valve plug assembly (3) for controlling the opening or closing of the gas outlet (12); characterized in that, The valve plug assembly (3) includes a secondary valve plug (6) and a primary valve plug (5) passing through the middle of the secondary valve plug (6). A pilot channel (4) is formed between the primary valve plug (5) and the secondary valve plug (6). The end of the primary valve plug (5) is provided with a connecting ring (9) for controlling the opening of the secondary valve plug (6), and the end of the primary valve plug (5) is fitted with a sealing ring (7) for sealing the pilot channel (4).

2. The pilot-type two-stage control structure according to claim 1, characterized in that, The primary valve plug (5) includes a valve sleeve body (51) that is controlled to extend and retract by the drive assembly (2), a connecting ring (9) is sleeved on the end of the valve sleeve body (51), and an installation groove (53) for sleeved sealing ring (7) is formed on the valve sleeve body (51).

3. The pilot-type two-stage control structure according to claim 2, characterized in that, The valve sleeve body (51) has a connector (52) at its end for engaging the connecting ring (9), and the secondary valve plug (6) has a through hole (81) in the middle for the connector (52) to pass through. The size of the connecting ring (9) is larger than the size of the through hole (81).

4. The pilot-type two-stage control structure according to claim 3, characterized in that, The valve sleeve body (51) has an abutment ring (54) arranged in the circumferential direction of the valve sleeve body (51), and the secondary valve plug (6) has a mating groove (85) in the middle that is engaged with the abutment ring (54).

5. The pilot-type two-stage control structure according to claim 4, characterized in that, The connector (52), mounting groove (53) and abutment ring (54) are arranged sequentially inward along the end of the valve sleeve body (51).

6. The pilot-type two-stage control structure according to claim 5, characterized in that, The cross-sectional diameters formed by the connector (52), mounting groove (53), and abutment ring (54) increase sequentially.

7. The pilot-type two-stage control structure according to claim 5, characterized in that, The sealing ring (7) installed in the mounting groove (53) abuts against the abutting ring (54).

8. The pilot-type two-stage control structure according to claim 3, characterized in that, The secondary valve plug (6) includes a valve plug support (8) and a snap ring (82) formed on the valve plug support (8). A through hole (81) is formed in the middle of the valve plug support (8). A valve plug body (83) for opening or closing the gas outlet (12) is installed on the snap ring (82).

9. The pilot-type two-stage control structure according to claim 8, characterized in that, The distance between the sealing ring (7) and the connecting ring (9) is greater than the thickness of the valve plug bracket (8) at the location of the through hole (81).

10. The pilot-type two-stage control structure according to claim 8, characterized in that, The snap ring (82) is also equipped with a valve plug retainer (84) for stably mounting the valve plug body (83) on the snap ring (82).

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