Liquefied petroleum gas over-flow cut-off protection bottle valve

Abstract

The utility model discloses a liquefied petroleum gas overflow cut -off protection bottle valve, the overflow cut -off subassembly includes the sealing ball and the inclined push link assembly in the medium channel, and the inclined push link assembly is located between the sealing ball and reset subassembly, and includes: the mounting seat is fixed in the medium channel, and the inside is equipped with the flow channel along the axial, and the import end is equipped with the first plugging bulge corresponding with the sealing ball, the link is through the first locating flat pad and the second locating flat pad of setting up in the mounting seat interval, and with both sliding fit, and the limiting ring that is equipped with on the link is greater than the link body's diameter, and the limiting ring is located below the first locating flat pad, the link reset spring, is set up on the link, and one end is with the abutment of limiting ring, and the other end is with the abutment of second locating flat pad. Reset subassembly is placed in the downstream of overflow cut -off subassembly, and when reset subassembly produces exception or leakage, the overflow cut -off subassembly on the medium channel upstream will cut off the airflow, until the trouble is eliminated, effectively improve the security of product.

Description

Technical Field

[0001] This utility model relates to the field of bottle valve technology, and in particular to a liquefied petroleum gas overflow cut-off protection bottle valve with a rear-mounted right-angle oblique push rod. Background Technology

[0002] Cylinder valves are crucial passive safety devices in the storage, transportation, and use of flammable and explosive gases such as liquefied petroleum gas. They effectively prevent fires and explosions caused by accidental large-volume leaks, ensuring the safety of life and property. Their core function is overcurrent shut-off; when the gas flow through the valve exceeds a preset rated value (threshold), the valve automatically and quickly cuts off the gas flow path completely. After overcurrent shut-off, 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 described in the applicant's previous patent application CN202311462030.X), where the reset component is placed in front of the overcurrent cut-off component from the direction of the bottle valve's inlet to outlet. This design presents a fundamental safety hazard: when the reset component leaks due to impact deformation, seal aging, or external damage, it will be unable to cut off the leakage, directly threatening safe use.

[0004] Furthermore, the traditional bottle valve reset assembly mainly uses two rubber O-rings, which are not very reliable in terms of sealing performance. However, there is a dilemma: if the number of O-rings is increased to improve sealing reliability, it will affect the elasticity of the reset assembly and cause reset resistance; if the elasticity of the reset spring is increased to improve the elasticity, it will make the external force required for pressing too large, resulting in a deterioration of the user experience. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of the prior art by providing a liquefied petroleum gas overflow cut-off protection cylinder valve.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0007] A liquefied petroleum gas (LPG) overflow cut-off protection cylinder valve includes a main valve body, an overflow cut-off assembly, a reset assembly, and an opening / closing assembly disposed on the main valve body. The main valve body has a media channel formed inside. The overflow cut-off assembly includes a sealing ball and a slanted push rod assembly disposed within the media channel. The slanted push rod assembly is located between the sealing ball and the reset assembly and includes: a mounting base fixed within the media channel, having an axially oriented flow channel inside, and a first sealing protrusion corresponding to the sealing ball at its inlet end; a guide rod penetrating through a first and a second positioning pad spaced apart within the mounting base, and slidingly engaging with both; a limiting ring with a diameter larger than the guide rod body, located below the first positioning pad; and a guide rod reset spring sleeved on the guide rod, one end abutting against the limiting ring, and the other end abutting against the second positioning pad.

[0008] A further technical solution is that the inclined push rod assembly also includes a mounting seat sealing ring, which is installed in the sealing ring mounting groove of the mounting seat and located between the mounting seat and the medium channel.

[0009] A further technical solution is that both the first and second positioning pads are provided with air inlet holes.

[0010] A further technical solution is that the reset assembly includes a reset valve body connected to the main valve body, a reset valve stem passing through the reset valve body, a reset pressure ring disposed in the reset valve body 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.

[0011] 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.

[0012] 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.

[0013] A further technical solution is that the upper end of the guide rod has a first inclined surface, and the corresponding end of the reset valve rod has a second inclined surface.

[0014] A further technical solution is that the angle between the first inclined plane and the axial direction is 45° to 70°, and the angle between the second inclined plane and the axial direction is 20° to 45°.

[0015] A further technical solution is that the angle between the first inclined plane and the axial direction is 65°, and the angle between the second inclined plane and the axial direction is 25°.

[0016] 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.

[0017] The beneficial effects of adopting the above technical solution are as follows:

[0018] From the air inlet to the air outlet of the bottle valve, the reset component is located downstream of the overcurrent cut-off component. When the reset component malfunctions or leaks, the overcurrent cut-off component upstream of the medium channel will cut off the airflow until the fault is eliminated, effectively improving the safety of the product.

[0019] The inclined push rod assembly converts the horizontal displacement of the press-reset valve stem into the vertical displacement of the sealing ball, thus pushing the sealing ball away from the first sealing protrusion. The inclined push rod assembly is embedded in the medium channel. The guide rod is a movable part that can overcome the pressure of the guide rod return spring, allowing axial movement within the mounting base. The mounting base has an axial flow channel inside, and the first and second positioning flat pads have inlet holes for gas passage, ensuring normal medium flow. When the medium flow is abnormal, the sealing ball moves vertically under the thrust generated by the medium flow, sealing against the first sealing protrusion to achieve the overflow cut-off function.

[0020] The reset sealing assembly of the reset component, from the inside out, includes a first reset seal, a second reset seal, and a third reset seal. The first reset seal uses a Y-ring, designed to achieve a good seal when the product pressure is high, as the Y-ring expands to a smaller portion, and automatically contracts to reduce sliding friction when the product pressure decreases. The second reset seal is an O-ring, similar to traditional bottle valves. The third reset seal is a sealing gasket with a tapered inner cross-section. When the gasket is compressed, it expands, and the inner tapered tip of the gasket compresses and expands against the reset valve stem, maintaining a good seal during the back-and-forth sliding of the reset valve stem. Because of the small contact area, friction is also reduced, ensuring the reset valve stem's rebound sensitivity. This design balances sealing and rebound, achieving effective and durable sealing and efficient rebound. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged view of section A in the middle;

[0023] Figure 3 This is a perspective view of the inclined push rod assembly of this utility model;

[0024] Figure 4 This is a cross-sectional view of the inclined push rod assembly of this utility model;

[0025] Figure 5 This is a schematic diagram of the bottle valve in normal operating condition;

[0026] Figure 6 This is a schematic diagram of the bottle valve cutting off the medium passage during overcurrent.

[0027] Figure 7 This is a schematic diagram of the bottle valve in its reset state;

[0028] Figure 8 This is a diagram showing the bottle valve returning to the closed state.

[0029] In the diagram: 1. Main valve body; 1-1. Medium passage; 1-1-1. Air inlet; 1-1-2. Air outlet; 1-2. 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; 4. Opening and closing assembly 4-1. Switch; 4-2. Switch plate; 4-3. Switch block; 4-4. Switch sealing block; 5. Inclined push rod assembly; 5-1. Mounting base; 5-1-1. Flow channel; 5-1-2. First sealing protrusion; 5-1-3. First positioning flat pad; 5-1-4. Second positioning flat pad; 5-1-5. Air inlet hole; 5-2. Guide rod; 5-2-1. Limiting ring; 5-3. Guide rod return spring; 5-4. Mounting base sealing ring; 6. Air inlet pipe. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] like Figure 1 As shown, a liquefied petroleum gas overcurrent cut-off protection cylinder valve is disclosed, including a main valve body 1, an overcurrent cut-off assembly, a reset assembly 3 and an opening and closing assembly 4 disposed on the main valve body 1.

[0033] Preferably, the liquefied petroleum gas overcurrent cut-off protection cylinder valve further includes an inlet pipe 6, which is located at the inlet end of the main valve body 1, and the outlet end of the inlet pipe 6 is connected to the medium channel 1-1. The inlet end of the inlet pipe 6 is connected to the outlet pipe of the liquefied gas tank. If the inlet pipe 6 is not selected, the inlet end of the main valve body 1 is directly connected to the outlet pipe of the liquefied gas tank.

[0034] The main valve body 1 is cast, and has a medium channel 1-1 and a second sealing protrusion 1-2 formed inside. The second sealing protrusion 1-2 has a through hole for liquefied gas to pass through, and is integrally formed with the main valve body 1.

[0035] Reference Figure 1-4 The overcurrent cut-off assembly includes a sealing ball 2 and an inclined push rod assembly 5 disposed within the medium channel 1-1. The inclined push rod assembly 5 is located between the sealing ball 2 and the reset assembly 3, and includes: a mounting base 5-1 fixed within the medium channel 1-1, with an axially oriented flow channel 5-1-1 inside, and a first sealing protrusion 5-1-2 corresponding to the sealing ball 2 at the inlet end; the mounting base 5-1 is provided with a first positioning flat pad 5-1-3 and a second positioning flat pad 5-1-4 spaced apart from top to bottom inside the mounting base 5-1. Each pad 5-1-4 has an air inlet hole 5-1-5 for gas to pass through; the guide rod 5-2 passes through the first positioning flat pad 5-1-3 and the second positioning flat pad 5-1-4, which are spaced apart inside the mounting base 5-1, and slides with them; the guide rod 5-2 has a limiting ring 5-2-1 with a diameter larger than the guide rod body, and the limiting ring 5-2-1 is located below the first positioning flat pad 5-1-3; the guide rod return spring 5-3 is sleeved on the guide rod 5-2, with one end abutting against the limiting ring 5-2-1 and the other end abutting against the second positioning flat pad 5-1-4.

[0036] Gas enters through inlet 1-1-1 and exits through outlet 1-1-2. Along the gas flow direction, the reset assembly 3 is located downstream of the overcurrent cut-off assembly. This is a rear-mounted structural design; if the reset assembly 3 malfunctions or leaks, the overcurrent cut-off assembly at the front end of the medium channel 1-1 will cut off the airflow until the fault is cleared, ensuring safety and effectively improving product safety.

[0037] Mounting base 5-1 is embedded in the medium channel. Guide rod 5-2 is a movable part that can overcome the pressure of guide rod return spring and realize axial movement in mounting base. The mounting base has a flow channel along the axial direction. The first positioning flat pad and the second positioning flat pad have air inlet holes for gas to pass through, ensuring normal medium flow. When the medium flow is abnormal, the sealing ball moves vertically under the thrust generated by the medium flow and seals against the first sealing protrusion to realize the overflow cut-off function.

[0038] The inclined push rod assembly 5 also includes a mounting seat sealing ring 5-4, which is installed in the sealing ring mounting groove of the mounting seat 5-1 and is located between the mounting seat 5-1 and the medium channel 1-1 to achieve a static seal between the mounting seat 5-1 and the medium channel 1-1.

[0039] Reference Figure 1 and Figure 2 The reset assembly 3 includes a reset valve body 3-2 connected to the main valve body 1, a reset valve stem 3-1 passing through the reset valve body 3-2, a reset pressure ring 3-3 disposed within the reset valve body 3-2 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 pressure 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.

[0040] 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.

[0041] 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 pressure ring 3-3 and the gaskets 3-9, respectively.

[0042] 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.

[0043] The upper end of the guide rod 5-2 has a first inclined surface, and the corresponding end of the reset valve rod 3-1 has a second inclined surface. The angle between the first inclined surface and the axial direction is 45° to 70°, and the angle between the second inclined surface and the axial direction is 20° to 45°. Through the coordinated movement of the first and second inclined surfaces, the horizontal displacement generated by pressing the reset valve rod 3-1 is converted into the vertical displacement of the guide rod 5-2.

[0044] In this embodiment, the angle between the first inclined plane 5-2-2 and the axial direction is 65°, and the angle between the second inclined plane 5-2-2 and the axial direction is 25°. Without considering external factors such as friction, the 45° angle results in the same horizontal thrust and vertical force. To reduce the gripping force required for manual pressing, while ensuring that the lateral displacement of the reset valve stem 3-1 meets the product design requirements, the angle between the first inclined plane 5-2-2 and the axial direction is designed to be 65°, and the angle between the second inclined plane 5-2-2 and the axial direction is designed to be 25°.

[0045] In use, pressing the reset cap 3-5 converts the horizontal displacement of the reset valve stem 3-1 into the vertical displacement of the drive guide rod 5-2 through the cooperation of the first and second inclined surfaces. The guide rod 5-2 moves downwards, pushing open the sealing ball 2 that is already attached to the first sealing protrusion 5-1-2, thus enabling the overcurrent cut-off protection bottle valve to function normally and achieving manual reset. After the sealing ball 2 is pushed open from the first sealing protrusion 5-1-2, the reset valve stem 3-1 resets under the elastic force of the reset spring 3-4, and the guide rod 5-2 resets under the elastic force of the guide rod reset spring 5-3.

[0046] 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. The opening and closing switch 4-1 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. A first slot is opened on the opening and closing valve stem. The opening and closing block 4-3 is threadedly connected to the inside of the main valve body 1. The opening and closing block 4-3 is located between the second sealing protrusion 1-2 and the opening and closing switch 4-1. A second slot is opened on the opening and closing block 4-3. The opening and closing plate 4-2 is located between the opening and closing valve stem and the opening and closing block 4-3. 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 located between the second sealing protrusion 1-2 and the opening and closing block 4-3. The opening and closing sealing block 4-4 can abut against the second sealing protrusion 1-2 to close the medium channel 1-1.

[0047] Reference Figure 5During the use of the overcurrent cut-off protection cylinder valve, the medium channel 1-1 inside the main valve body 1 is opened by turning the on / off switch 41 of the on / off assembly 4. The liquefied gas in the liquefied gas tank enters the medium channel 1-1 through the inlet 1-1-1, then passes through the first sealing protrusion 5-1-2 and the second sealing protrusion 1-2, and is discharged from the outlet 1-1-2. (Refer to...) Figure 6 When a fault occurs and overcurrent occurs, the sealing ball 2 inside the main valve body 1 moves vertically. The sealing ball 2 engages with the first sealing protrusion 5-1-2 to achieve a seal, thus preventing further leakage of liquefied gas. (Refer to...) Figure 7 and Figure 8 Turning the on / off switch 41 of the on / off assembly 4 closes the medium passage 1-1. After troubleshooting, pressing the reset cover 3-5 of the reset assembly 3 causes the reset valve stem 3-1 to drive the guide rod 5-2 downward, pushing open the sealing ball 2 that is already attached to the first sealing protrusion 5-1-2, thereby restoring the overcurrent cut-off protection bottle valve to the closed state.

[0048] 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 liquefied petroleum gas overcurrent cut-off protection cylinder valve, comprising a main valve body (1), an overcurrent cut-off assembly, a reset assembly (3), and an opening and closing assembly (4) disposed on the main valve body (1), wherein a medium channel (1-1) is formed inside the main valve body (1), characterized in that: The overcurrent cut-off assembly includes a sealing ball (2) and a slanted push rod assembly (5) disposed within the medium channel (1-1). The slanted push rod assembly (5) is located between the sealing ball (2) and the reset assembly (3) and includes: a mounting base (5-1) fixed within the medium channel (1-1), which has an axially arranged flow channel (5-1-1) inside and a first sealing protrusion (5-1-2) corresponding to the sealing ball (2) at its inlet end; and a guide rod (5-2) penetrating within the mounting base (5-1). A first positioning pad (5-1-3) and a second positioning pad (5-1-4) are spaced apart and slide in cooperation with each other; a limiting ring (5-2-1) with a diameter larger than the guide rod body is provided on the guide rod (5-2), and the limiting ring (5-2-1) is located below the first positioning pad (5-1-3); a guide rod return spring (5-3) is sleeved on the guide rod (5-2), one end of which abuts against the limiting ring (5-2-1), and the other end of which abuts against the second positioning pad (5-1-4).

2. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 1, characterized in that: The inclined push rod assembly (5) also includes a mounting seat sealing ring (5-4), which is installed in the sealing ring mounting groove of the mounting seat (5-1) and is located between the mounting seat (5-1) and the medium channel (1-1).

3. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 1, characterized in that: Both the first positioning pad (5-1-3) and the second positioning pad (5-1-4) are provided with air inlet holes (5-1-5).

4. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 1, characterized in that: The reset assembly (3) includes a reset valve body (3-2) connected to the main valve body (1), a reset valve stem (3-1) passing through the reset valve body (3-2), a reset pressure ring (3-3) set in the reset valve body (3-2) 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 set 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).

5. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 4, 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).

6. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 5, 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.

7. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 4, characterized in that: The upper end of the guide rod (5-2) has a first inclined surface, and the corresponding end of the reset valve rod (3-1) has a second inclined surface.

8. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 7, characterized in that: The angle between the first inclined plane and the axial direction is 45° to 70°, and the angle between the second inclined plane and the axial direction is 20° to 45°.

9. The liquefied petroleum gas overcurrent shut-off protection cylinder valve according to claim 8, characterized in that: The first inclined plane has an angle of 65° with the axial direction, and the second inclined plane has an angle of 25° with the axial direction.

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

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