Front-mounted dual over-flow protection valve

Abstract

The utility model discloses a front -positioned double over -current protection valve, including main valve body, set up on the reset subassembly and open -close subassembly of main valve body, and the medium passage and sealing seat are formed in main valve body inside, and the sealing ball is equipped in medium passage, and reset subassembly includes the reset valve body connected with main valve body, and the axial through -hole that communicates with medium passage is equipped in reset valve body inside, and the reset valve rod is slidably equipped in axial through -hole, and the outlet of axial through -hole to medium passage is equipped with reset sealing structure, and the one end of reset valve rod towards medium passage does not extend into medium passage inside, so that when the abnormal over -current of reset path occurs, the sealing ball can be in line with reset sealing structure and close airflow channel under the drive of fluid pressure. To realize the over -current protection mechanism of main channel and reset path two -way independent. Make up the inherent defect of traditional structure on the safety, and the response capability and safety guarantee level of bottle valve under abnormal operating condition have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of bottle valve technology, and in particular to a front-mounted dual overflow protection valve. Background Technology

[0002] In the storage, transportation, and use systems of flammable and explosive gases such as liquefied petroleum gas (LPG), cylinder valves, as critical safety control devices, are widely used at cylinder outlets to control the flow of the medium and provide automatic safety protection under abnormal operating conditions. Existing cylinder valves generally possess overcurrent shut-off functionality; that is, when the gas flow through the valve exceeds a preset threshold, hydrodynamic forces actuate internal moving parts (such as a sealing ball), automatically and rapidly cutting off the gas flow path completely. After overcurrent shut-off occurs, the valve is in the closed state. Manual pressing of the reset component on the valve is required.

[0003] Traditional bottle valve reset components typically employ a front-mounted structure, as seen in the applicant's previous patent application CN202311462030.X. In this design, the reset component is placed upstream of the sealing seat, from the inlet to the outlet of the bottle valve. This presents an inherent safety hazard: when the reset component leaks due to external impact, aging of the seal, or mechanical damage, its upstream location and lack of an independent shut-off mechanism mean that any abnormal overflow cannot automatically cut off the reset path, leading to continued leakage and potentially causing a fire or explosion.

[0004] To address the aforementioned issues, the applicant submitted application numbers 202521712881X and 2025217151233 for a rear-mounted liquefied petroleum gas overcurrent shut-off protection cylinder valve. While these valves solve the technical problems, they complicate the valve structure and significantly increase costs. Utility Model Content

[0005] This utility model provides a front-mounted dual overflow protection valve. It aims to solve the technical problem in existing front-mounted reset structures that cannot automatically shut off in case of leakage, posing a safety hazard. By setting an independent reset sealing structure at the outlet of the axial through-hole leading to the medium channel, and cooperating with the sealing ball inside the medium channel, dual overflow protection is achieved for both the main channel and the reset path, thereby improving the overall safety performance and reliability of the valve.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: A front-mounted dual overflow protection valve includes a main valve body, a reset assembly and an opening / closing assembly disposed on the main valve body. The main valve body has a media channel and a sealing seat inside. A sealing ball is disposed within the media channel and is movably positioned upstream of the sealing seat. The reset assembly includes a reset valve body connected to the main valve body. The reset valve body has an axial through hole communicating with the media channel inside. A reset valve stem is slidably disposed within the axial through hole. A reset sealing structure is provided at the outlet of the axial through hole leading to the media channel. The end of the reset valve stem facing the media channel does not extend into the media channel, so that when an abnormal overflow occurs in the reset path, the sealing ball can adhere to the reset sealing structure under fluid pressure and close the airflow channel.

[0007] A further technical solution is that the reset sealing structure is an annular sealing protrusion or an annular sealing groove provided around the outlet of the axial through hole leading to the medium channel.

[0008] A further technical solution is that the reset assembly also includes a reset pressure ring disposed at the outer end of the axial through hole for limiting the reset valve stem, a reset spring sleeved on the reset valve stem, and a reset sealing assembly disposed between the reset valve body and the reset valve stem, wherein a reset pressure cap is provided at the end of the reset valve stem away from the main valve body.

[0009] A further technical solution is that the reset sealing assembly includes, from the inside out, a first reset seal, a second reset seal, and a third reset seal.

[0010] A further technical solution is that the first reset seal is a Y-type sealing ring, the second reset seal is an O-type sealing ring, and the third reset seal is a sealing gasket with a tapered inner ring cross-section and gaskets on both sides of the sealing gasket.

[0011] A further technical solution includes an air inlet pipe, which is located at the air inlet end of the main valve body and the air outlet end of the air inlet pipe is connected to the medium channel. The air inlet end of the air inlet pipe is connected to the air outlet end of the liquefied gas tank.

[0012] A further technical solution is that an air inlet hole is provided on the wall of the air inlet pipe.

[0013] A further technical solution is that the opening and closing assembly includes an opening and closing switch, an opening and closing plate, an opening and closing block, and an opening and closing sealing block. The opening and closing switch is rotatably connected to the main valve body and includes an opening and closing valve stem and an opening and closing valve cover disposed on the opening and closing valve stem. The opening and closing valve stem is rotatably connected to the main valve body and has a first slot. The opening and closing block is threadedly connected to the inside of the main valve body and is located between the sealing seat and the opening and closing switch. The opening and closing block has a second slot. The opening and closing plate is located between the opening and closing valve stem and the opening and closing block, and both ends of the opening and closing plate are respectively located in the first slot and the second slot. At the same time, the bottom of the opening and closing plate is supported on the opening and closing block, and the opening and closing sealing block is disposed at the end of the opening and closing block.

[0014] A further technical solution is that the sealing seat is provided with a first sealing protrusion corresponding to the sealing ball; and a second sealing protrusion corresponding to the opening and closing sealing block.

[0015] The beneficial effects of adopting the above technical solution are as follows: By installing a reset sealing structure at the outlet of the axial through-hole leading to the medium channel, and ensuring that the end of the reset valve stem does not extend into the medium channel, when the reset assembly leaks due to impact deformation, seal aging, or external damage, the pressure difference generated by the medium flow will push the sealing ball to move rapidly and form an effective sealing fit with the reset sealing structure, automatically cutting off the airflow in the reset path and preventing uncontrollable leakage from continuing. Simultaneously, the original overflow cut-off function based on the fit between the sealing ball and the first sealing protrusion is retained on the main channel side, thus realizing a dual-path independent overflow protection mechanism for the "main channel" and the "reset path." This dual overflow protection design inherits the advantages of convenient operation of the front-mounted structure while overcoming the inherent safety defects of the traditional structure, significantly improving the response capability and safety level of the valve under abnormal operating conditions. Furthermore, the reset sealing structure adopts optional sealing protrusions or sealing grooves, facilitating structural optimization according to process requirements and improving assembly accuracy and sealing stability. The overall structure is compact and highly reliable, allowing for upgrades without significant changes to the original production process. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the present invention; Figure 2 yes Figure 1 Enlarged view of section A; Figure 3 This is a schematic diagram of the overcurrent cutoff reset path status.

[0017] In the diagram: 1. Main valve body; 1-1. Medium passage; 1-1-1. Air inlet; 1-1-2. Air outlet; 1-2. Sealing seat; 1-2-1. First sealing protrusion; 1-2-2. Second sealing protrusion; 2. Sealing ball; 3. Reset assembly; 3-1. Reset valve stem; 3-2. Reset valve body; 3-3. Reset pressure ring; 3-4. Reset spring; 3-5. Reset gland; 3-6. First reset seal; 3-7. Second reset seal; 3-8. Third reset seal; 3-9. Gasket; 3-10. Axial through hole; 3-11. Reset sealing structure; 4. Opening and closing assembly; 4-1. Opening and closing switch; 4-2. Opening and closing plate; 4-3. Opening and closing block; 4-4. Opening and closing sealing block; 5. Air inlet pipe; 5-1. Air inlet hole. Detailed Implementation

[0018] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] like Figure 1 As shown, a front-mounted dual overflow protection valve is disclosed, including a main valve body 1, a reset component 3 and an opening / closing component 4 disposed on the main valve body 1.

[0021] The main valve body 1 is cast and internally formed with a medium channel 1-1 and a sealing seat 1-2. A sealing ball 2 is provided within the medium channel 1-1, and the sealing ball 2 is movably positioned upstream of the sealing seat 1-2. The sealing seat 1-2 has a through hole for liquefied gas to pass through and is integrally formed with the main valve body 1. The sealing seat 1-2 has a first sealing protrusion 1-2-1 corresponding to the sealing ball 2; and a second sealing protrusion 1-2-2 corresponding to the opening and closing sealing block 4-4.

[0022] Reference Figure 1 and Figure 2The reset assembly 3 includes a reset valve body 3-2 connected to the main valve body 1. The reset valve body 3-2 has an axial through hole 3-10 communicating with the medium channel 1-1. A reset valve stem 3-1 is slidably disposed in the axial through hole 3-10. A reset sealing structure 3-11 is provided at the outlet of the axial through hole 3-10 leading to the medium channel 1-1. The end of the reset valve stem 3-1 facing the medium channel 1-1 does not extend into the medium channel 1-1, so that when an abnormal overflow occurs in the reset path, the sealing ball 2 can adhere to the reset sealing structure 3-11 and seal the airflow channel under the drive of fluid pressure.

[0023] The reset sealing structure 3-11 is an annular sealing protrusion or annular sealing groove provided around the outlet of the axial through hole 3-10 leading to the medium channel 1-1. In this embodiment, the reset sealing structure 3-11 is an annular sealing groove, and the contour of the annular sealing groove matches the surface of the sealing ball 2 to form a sealing pair.

[0024] When the reset assembly leaks due to impact deformation, seal aging, or external damage, the sealing ball 2 will engage with the reset sealing structure to automatically cut off the reset path (e.g., Figure 3 This design prevents uncontrollable media leakage and avoids major safety accidents. When an abnormality or leakage occurs downstream of the sealing seat 1-2, the sealing ball 2 will seal against the first sealing protrusion 1-2-1, thereby sealing the media channel 1-1. This achieves a dual overcurrent shut-off function for the bottle valve; that is, in addition to the original main valve overcurrent shut-off function, a press-to-reset port for overcurrent shut-off is added, further improving the safety features.

[0025] Preferably, the reset assembly 3 further includes a reset pressure ring 3-3 disposed at the outer end of the axial through hole 3-10 for limiting the reset valve stem 3-1, a reset spring 3-4 sleeved on the reset valve stem 3-1, and a reset sealing assembly disposed between the reset valve body 3-2 and the reset valve stem 3-1. A reset cap 3-5 is provided at the end of the reset valve stem 3-1 away from the main valve body 1. The reset pressure ring 3-3 is disposed inside the reset valve body 3-2 and sleeved on the reset valve stem 3-1. A limiting part is formed on the reset valve body 3-2 for limiting the reset pressure ring 3-3, and the limiting part limits the reset pressure ring 3-3.

[0026] The reset valve body 3-2 is located at the side end of the main valve body 1, and is integrally formed with the main valve body 1. In this embodiment, the reset valve body 3-2 is perpendicular to the main valve body 1.

[0027] The reset sealing assembly comprises, from the inside out, a first reset seal 3-6, a second reset seal 3-7, and a third reset seal 3-8. The first reset seal 3-6 is a Y-ring, the second reset seal 3-7 is an O-ring, and the third reset seal 3-8 is a sealing gasket with a tapered inner ring. Gaskets 3-9 are provided on both sides of the sealing gasket. The two ends of the reset spring 3-4 abut against the reset cap 3-5 and the gaskets 3-9, respectively.

[0028] The reset sealing assembly of the reset component, from the inside out, includes a first reset seal 3-6, a second reset seal 3-7, and a third reset seal 3-8. The first reset seal 3-6 uses a Y-ring seal. Its purpose is to achieve good sealing performance when the product pressure is high, and to automatically retract the ring when the product pressure decreases, reducing sliding friction. The second reset seal 3-7 is an O-ring seal, similar to traditional bottle valves. The third reset seal 3-8 is a sealing gasket with a tapered inner cross-section. When the gasket is compressed, it expands as a whole, and the inner tapered tip of the gasket compresses and expands against the reset valve stem, maintaining good sealing performance during the back-and-forth sliding of the reset valve stem. Because the contact area is small, friction is also reduced, ensuring the reset valve stem's rebound sensitivity. This design balances sealing and rebound, achieving effective and durable sealing and effective rebound.

[0029] Reference Figure 1 The opening and closing assembly 4 includes an opening and closing switch 4-1, an opening and closing plate 4-2, an opening and closing block 4-3, and an opening and closing sealing block 4-4. The opening and closing switch 4-1 is rotatably connected to the main valve body 1 and includes an opening and closing valve stem and an opening and closing valve cover disposed on the opening and closing valve stem. The opening and closing valve stem is rotatably connected to the main valve body 1 and has a first slot. The opening and closing block 4-3 is threadedly connected to the inside of the main valve body 1 and is located between the sealing seat 1-2 and the opening and closing switch 4-1. The opening and closing block 4-3 has a second slot. The opening and closing plate 4-2 is located between the opening and closing valve stem and the opening and closing block 4-3, and the two ends of the opening and closing plate 4-2 are respectively located in the first slot and the second slot. At the same time, the bottom of the opening and closing plate 4-2 is supported on the opening and closing block 4-3. The opening and closing sealing block 4-4 is disposed at the end of the opening and closing block 4-3 and is used to fit against the second sealing protrusion 1-2-2 to achieve sealing.

[0030] Preferably, the pre-positioned dual overflow protection valve further includes an air inlet pipe 5, which is located at the air inlet end of the main valve body 1, and the air outlet end of the air inlet pipe 5 is connected to the medium channel 1-1. The air inlet end of the air inlet pipe 5 is connected to the air outlet pipe of the liquefied gas tank. If the air inlet pipe 5 is not selected, the air inlet end of the main valve body 1 is directly connected to the air outlet pipe of the liquefied gas tank. An air inlet hole 5-1 is provided on the pipe wall of the air inlet pipe 5.

[0031] During operation of the pre-operated dual overflow protection valve, the medium passage 1-1 inside the main valve body 1 is opened by turning the on / off switch 41 of the on / off assembly 4. Liquefied gas from the liquefied gas tank enters the medium passage 1-1 through the inlet 1-1-1, then passes through the sealing seat 1-2 and is discharged from the outlet 1-1-2. (Refer to...) Figure 3 When the reset assembly 3 malfunctions and experiences overcurrent, the sealing ball 2 cooperates with the reset sealing structure 3-11 to achieve a sealing cut-off, automatically cutting off the reset path to prevent uncontrollable media leakage and avoid major safety accidents. Turning the on / off switch 41 of the opening / closing assembly 4 closes the media channel 1-1. After troubleshooting, pressing the reset cap 3-5 of the reset assembly 3 pushes the reset valve stem 3-1 away from the sealing ball 2 already attached to the reset sealing structure 3-11, thus restoring the front-mounted dual overcurrent protection valve to the closed state.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A front-mounted dual overcurrent protection valve, comprising a main valve body (1), a reset assembly (3) disposed on the main valve body (1), and an opening / closing assembly (4), wherein the main valve body (1) has a medium channel (1-1) and a sealing seat (1-2) formed inside, a sealing ball (2) is provided in the medium channel (1-1), the sealing ball (2) is movably disposed upstream of the sealing seat (1-2), the reset assembly (3) includes a reset valve body (3-2) connected to the main valve body (1), the reset valve body (3-2) has an axial through hole (3-10) communicating with the medium channel (1-1) inside, and a reset valve stem (3-1) is slidably disposed in the axial through hole (3-10), characterized in that: The axial through hole (3-10) is provided with a reset sealing structure (3-11) at the outlet of the medium channel (1-1). The end of the reset valve stem (3-1) facing the medium channel (1-1) does not extend into the medium channel (1-1), so that when an abnormal overflow occurs in the reset path, the sealing ball (2) can fit with the reset sealing structure (3-11) and close the airflow channel under the drive of fluid pressure.

2. The front-mounted dual overcurrent protection valve according to claim 1, characterized in that: The reset sealing structure (3-11) is an annular sealing protrusion or an annular sealing groove provided around the outlet of the axial through hole (3-10) leading to the medium channel (1-1).

3. The front-mounted dual overcurrent protection valve according to claim 1, characterized in that: The reset assembly (3) further includes a reset pressure ring (3-3) for limiting the reset valve stem (3-1) located at the outer end of the axial through hole (3-10), a reset spring (3-4) sleeved on the reset valve stem (3-1), and a reset sealing assembly located between the reset valve body (3-2) and the reset valve stem (3-1). The end of the reset valve stem (3-1) away from the main valve body (1) is provided with a reset pressure cap (3-5).

4. The front-mounted dual overcurrent protection valve according to claim 3, characterized in that: The reset sealing assembly includes, from the inside out, a first reset seal (3-6), a second reset seal (3-7), and a third reset seal (3-8).

5. The front-mounted dual overcurrent protection valve according to claim 4, characterized in that: The first reset seal (3-6) is a Y-type sealing ring, the second reset seal (3-7) is an O-type sealing ring, the third reset seal (3-8) is a sealing gasket, and the inner ring cross-section of the sealing gasket is conical. Gaskets (3-9) are provided on both sides of the sealing gasket.

6. The front-mounted dual overcurrent protection valve according to claim 1, characterized in that: It also includes an air inlet pipe (5), which is located at the air inlet end of the main valve body (1), and the air outlet end of the air inlet pipe (5) is connected to the medium channel (1-1), and the air inlet end of the air inlet pipe (5) is connected to the air outlet end of the liquefied gas tank.

7. The front-mounted dual overcurrent protection valve according to claim 6, characterized in that: An air inlet hole (5-1) is provided on the wall of the air inlet pipe (5).

8. The front-mounted dual overcurrent protection valve according to claim 1, characterized in that: The opening and closing assembly (4) includes an opening and closing switch (4-1), an opening and closing plate (4-2), an opening and closing block (4-3), and an opening and closing sealing block (4-4). The opening and closing switch (4-1) is rotatably connected to the main valve body (1) and includes an opening and closing valve stem and an opening and closing valve cover disposed on the opening and closing valve stem. The opening and closing valve stem is rotatably connected to the main valve body (1) and has a first slot. The opening and closing block (4-3) is threaded into the interior of the main valve body (1) and opens and closes. The block (4-3) is located between the sealing seat (1-2) and the on / off switch (4-1). The on / off block (4-3) has a second slot. The on / off plate (4-2) is located between the on / off valve stem and the on / off block (4-3). The two ends of the on / off plate (4-2) are located in the first slot and the second slot, respectively. The bottom of the on / off plate (4-2) is supported on the on / off block (4-3). The on / off sealing block (4-4) is located at the end of the on / off block (4-3).

9. The front-mounted dual overcurrent protection valve according to claim 8, characterized in that: The sealing seat (1-2) is provided with a first sealing protrusion (1-2-1) corresponding to the sealing ball (2); and a second sealing protrusion (1-2-2) corresponding to the opening and closing sealing block (4-4).

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