A gas valve for a portable gas stove

Abstract

This utility model discloses a gas valve for a portable gas stove, including a valve body and a gas cylinder connector mounted on the valve body. A valve stem is disposed within the valve body, comprising a stem tip, a stem head, and a stem body. The stem tip is used to contact and engage with the gas nozzle of the gas cylinder. A sealing ring is provided on the stem head, which is used to seal against the inner wall of the first section of the air inlet chamber within the gas cylinder connector. A spring is sleeved on the stem body, one end of which abuts against a limiting ring on the stem body, and the other end abuts against the bottom end of a stem groove opened within the valve body. A through hole is provided at the bottom of the stem groove for the stem tail to pass freely through. The advantages of this utility model are: simple and compact structure, no need for an additional power source, and multiple safety protections can be achieved solely through the cooperation of mechanical components; precise pressure regulation range, adaptable to the working pressure requirements of common portable gas stoves; rapid overpressure protection response, effectively preventing safety accidents such as gas leaks and explosions, and suitable for portable gas stoves in various scenarios such as homes and outdoors.

Description

Technical Field

[0001] This utility model relates to the field of portable gas stove technology, and in particular to a gas valve for portable gas stoves. Background Technology

[0002] Portable gas stoves, as a type of portable heating device, are widely used in home cooking, outdoor picnics, and other scenarios. Their safety is directly related to the personal and property safety of users. The gas supply of a portable gas stove typically relies on a replaceable small gas cylinder. Therefore, the gas valve, as the core component connecting the gas cylinder and the gas stove, has a structural design that is crucial to the safe and stable operation of the device.

[0003] Currently, common gas valves for portable gas stoves on the market mainly suffer from the following technical defects: Traditional gas valves mostly use manual switches to control gas flow, requiring users to rotate or press to supply gas, resulting in poor operational convenience; furthermore, when the pressure inside the gas cylinder rises abnormally (such as due to gas expansion caused by increased temperature), they cannot automatically adjust the pressure, easily leading to gas leaks or burner backfire. While some gas valves have simple overpressure protection functions (such as closing the gas inlet channel by spring-loaded sealing), they can only cut off the gas supply within a certain pressure range; in extreme overpressure situations (such as internal combustion of the gas cylinder or a sudden pressure surge due to severe blockage), the closed seal may fail due to excessive pressure, and gas may still leak through gaps, failing to completely eliminate safety hazards. The structural design of existing gas valves is generally quite complex, relying on the coordinated operation of multiple independent components, which not only increases manufacturing costs but may also lead to functional failure due to component wear or assembly errors, thus requiring improved reliability.

[0004] Therefore, it is necessary to develop a gas valve for cassette stoves that is simple in structure, easy to operate, and has multiple safety protection mechanisms to solve problems such as lagging pressure regulation, incomplete overpressure protection, and complex structure in existing technologies. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a gas valve for a cassette stove, thereby solving one or more of the above-mentioned prior art problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a gas valve for a portable gas stove, comprising a valve body and a gas cylinder connector disposed on the valve body. Its innovation lies in the following: a valve stem is disposed within the valve body, the valve stem comprising a stem tip, a stem head, and a stem body; the stem tip is used to contact and cooperate with the gas nozzle of the gas cylinder; a sealing ring is disposed on the stem head, the sealing ring being used to seal and cooperate with the inner wall of the first section of the air inlet chamber within the gas cylinder connector; a spring is disposed outside the stem body, one end of the spring abutting against a limiting ring on the stem body, and the other end abutting against the bottom end of a rod groove opened within the valve body; a through hole is provided at the bottom of the rod groove for the stem tail to pass freely through;

[0007] When the gas cylinder is connected to the gas cylinder connector, the gas cylinder nozzle passes through the connector's interface and presses against the valve stem tip, causing the valve stem to move backward. The sealing ring on the stem head disengages from the inner wall of the first section of the gas cylinder connector's intake chamber, connecting the first section of the intake chamber with the second section of the intake chamber within the valve body. When the pressure inside the intake chamber changes, the valve stem moves along the groove under the combined action of the spring force and the chamber pressure. By controlling the contact or disengagement of the sealing ring with the inner wall of the first section of the intake chamber, the intake channel is closed or connected. When the pressure inside the intake chamber exceeds a set threshold, the pressure inside the chamber is greater than the gas cylinder connector's suction force on the gas cylinder, causing the gas cylinder to eject.

[0008] In some implementations, when the gas valve is in normal use, the pressure inside the valve body is 0.2-0.4 MPa. At this time, the sealing ring on the rod head is separated from the inner wall of the first section of the air intake chamber, and the air intake passage remains connected.

[0009] In some implementations, when the pressure inside the intake chamber is 0.4-0.6 MPa, the valve stem moves forward under the action of the spring force and the pressure inside the chamber, and the sealing ring on the stem head contacts the inner wall of the first section of the intake chamber, closing the intake passage and preventing the gas cylinder from ejecting.

[0010] In some implementations, when the pressure inside the air intake chamber is between 0.6 and 1 MPa, the pressure inside the air intake chamber is greater than the suction force of the gas cylinder connector on the gas cylinder, causing the gas cylinder to pop out.

[0011] The advantages of this utility model are: simple and compact structure, no need for additional power source, multiple safety protections can be achieved through the cooperation of mechanical parts; precise pressure adjustment range (0.2-0.6 MPa), adaptable to the working pressure requirements of common portable gas stoves; rapid overpressure protection response, which can effectively avoid safety accidents such as gas leakage and explosion, and is suitable for portable gas stove equipment in various scenarios such as home and outdoor. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0013] Figure 1 This is a schematic diagram of the structure of a gas valve for a portable gas stove according to this utility model.

[0014] Figure 2 This is a cross-sectional structural diagram of a gas valve for a portable gas stove according to this utility model. Detailed Implementation

[0015] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] like Figure 1 and Figure 2 As shown, the present utility model embodiment includes: a gas valve for a cassette stove, mainly composed of a valve body 001, a gas cylinder connector 002 disposed on the valve body 001, and core components such as a valve stem, a spring 401, and a sealing ring 301 installed inside the valve body 001.

[0017] The valve body 001 is a hollow cavity structure made of metal (such as copper alloy or stainless steel). One side of it is connected to the gas pipeline of the portable gas stove, and the other side is fixedly connected to the gas cylinder connector 002 by thread or snap-fit. The gas cylinder connector 002 is a cylindrical structure with one open end, which is used to dock with the end of the gas cylinder. The interior has a stepped air inlet chamber along the axial direction. The air inlet chamber is divided into a first section 201 and a second section 202 with different diameters (the first section 201 is close to the gas cylinder, and the second section 202 is close to the valve body 001).

[0018] The valve stem is a cylindrical metal rod 103, which passes through the valve body 001 along its axial direction. Its structure is divided into three parts: the front end is a rod tip 101 (hemispherical or conical in shape to reduce the contact area and distribute pressure) that contacts the gas cylinder nozzle; the middle section is a rod head 102 (with a diameter larger than the rod body 103, forming a stepped surface), and an annular groove is provided on the outer circumferential surface of the rod head 102. The sealing ring 301 (made of high-pressure resistant rubber, such as fluororubber) is embedded in the groove for sealing with the inner wall of the first section 201 of the air inlet chamber; the rear end is the rod body 103, and a limit ring 402 (which can be formed by turning or welding) is provided on the outer circumferential surface of the rod body 103.

[0019] A rod groove 203 is provided inside the valve body 001 corresponding to the position of the valve stem. The rod groove 203 is a cylindrical blind hole with a diameter slightly larger than the diameter of the rod body 103 to allow the valve stem to slide freely along the axial direction. The spring 401 is a compression spring 401, which is sleeved on the outside of the rod body 103. One end of the spring abuts against the rear end face of the limiting ring 402, and the other end abuts against the bottom end of the rod groove 203 to provide the valve stem with a forward (towards the gas cylinder) elastic force. A through hole (with a diameter slightly larger than the diameter of the valve stem tail 104) is also provided at the bottom of the rod groove 203 to allow the valve stem tail 104 to pass through freely when moving, so as to avoid the formation of gas pressure obstruction in the rod groove 203.

[0020] When the gas cylinder is connected to the gas cylinder connector 002, the gas cylinder nozzle passes through the open end of the gas cylinder connector 002 and contacts the tip 101 of the valve stem, applying axial pressure. Because the tip 101 is hemispherical, the pressure is concentrated and uniform upon contact, effectively preventing the nozzle from deforming due to excessive localized force. At this time, the valve stem moves backward (away from the gas cylinder), compressing the spring 401 until the sealing ring 301 on the stem tip 102 completely disengages from the inner wall of the first section 201 of the air intake chamber (i.e., the sealing ring 301 moves to the position of the second section 202 of the air intake chamber). At this point, the first section 201 of the air intake chamber connects with the air intake channel inside the valve body 001, allowing the gas from the gas cylinder to enter the valve body 001 through the air intake chamber and ultimately be delivered to the burner of the portable gas stove.

[0021] This structure enables the air intake channel to be opened through direct contact between the valve stem and the gas nozzle, avoiding the cumbersome additional operation required by traditional gas valves and improving ease of use; at the same time, the design of the hemispherical rod tip 101 can extend the service life of the gas nozzle.

[0022] The valve body 001 is also equipped with a protective component, which includes a protective bracket, a protective lever, and a protective spring between the protective bracket and the protective lever. The protective spring provides tension between the protective lever and the protective bracket. The middle part of the protective lever is hinged to the protective bracket, and the end of the protective lever has a positioning hole through which the rod tail 104 can pass. The protective component also includes a limiting groove on the rod body 103. When the pressure inside the valve body 001 rises to 0.4-0.6 MPa, the valve rod moves backward, and the end of the protective lever will be locked into the limiting groove. If the external environment returns to normal and the pressure inside the valve body 001 drops back to 0.2-0.4 MPa, the protective lever needs to be manually pressed to disengage it from the limiting groove, so that the valve rod will return to normal operation and the gas cylinder will resume gas supply.

[0023] During normal use (within valve body 001 at a pressure of 0.2-0.4 MPa), the backward pressure generated by the gas is less than the forward force of spring 401, keeping the valve stem in a backward position. The sealing ring 301 disengages from the first section 201 of the intake chamber, and the intake passage remains open. When external factors (such as abnormal pressure increase within the gas cylinder or burner blockage) cause the pressure within valve body 001 to rise to 0.4-0.6 MPa, the backward pressure of the gas gradually increases and approaches the force of spring 401. The valve stem, pushed by spring 401, slowly moves forward until the sealing ring 301 re-fits tightly against the inner wall of the first section 201 of the intake chamber, closing the intake passage and stopping gas delivery. At this time, because the gas cylinder connector 002's attraction force on the gas cylinder (e.g., through internal elastic claws or magnetic structures) is greater than the internal pressure, the gas cylinder will not eject.

[0024] By dynamically balancing the spring 401 with the internal pressure, the gas valve achieves automatic adjustment, which can promptly cut off the gas supply when the gas pressure rises abnormally, avoiding gas leakage or equipment damage caused by excessive pressure, and significantly improving safety.

[0025] When the internal pressure of valve body 001 is 0.6-1 MPa due to extreme conditions (such as internal combustion or severe blockage of the gas cylinder), the internal pressure will be greater than the adsorption force of gas cylinder connector 002 on the gas cylinder. The gas cylinder will be directly ejected by the internal pressure, completely cutting off the gas supply.

[0026] This design triggers the automatic ejection of the gas cylinder by a physical pressure threshold, forming a dual protection mechanism (closing the air intake channel + ejecting the gas cylinder), which can minimize safety risks under extreme overpressure conditions.

[0027] The gas valve for the portable gas stove described in this utility model achieves fully automatic control of the entire process of "connection and conduction - pressure regulation - overpressure protection" through the coordinated action of the valve stem, spring 401, sealing ring 301 and gas cylinder connector 002: it automatically conducts gas supply when the gas cylinder is connected; it automatically closes the gas inlet channel when the pressure rises abnormally; and it automatically ejects the gas cylinder in case of extreme overpressure.

[0028] The advantages of this technical solution are:

[0029] (1) The structure is simple and compact, requiring no additional power source, and multiple safety protections can be achieved through the cooperation of mechanical parts;

[0030] (2) The pressure adjustment range is precise (0.2-0.6 MPa), which is suitable for the working pressure requirements of common cassette stoves;

[0031] (3) The overpressure protection responds quickly and can effectively avoid safety accidents such as gas leakage and explosion. It is suitable for various scenarios such as home and outdoor use.

[0032] The above description is merely a specific embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct / indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A gas valve for a portable gas stove, comprising a valve body (001) and a gas cylinder connector (002) arranged on the valve body (001), characterized in that: A valve stem is provided inside the valve body (001). The valve stem includes a stem tip (101), a stem head (102), and a stem body (103). The stem tip (101) is used to contact and cooperate with the gas nozzle of the gas cylinder. The stem head (102) is provided with a sealing ring (301), which is used to seal and cooperate with the inner wall of the first section (201) of the air inlet chamber in the gas cylinder connector (002). A spring (401) is provided on the outer sleeve of the stem body (103). One end of the spring (401) abuts against the limiting ring (402) on the stem body (103), and the other end abuts against the bottom end of the stem groove (203) opened in the valve body (001). A through hole is provided at the bottom of the stem groove (203) for the stem tail (104) to pass freely. When the gas cylinder is connected to the gas cylinder connector (002), the gas cylinder nozzle passes through the interface of the gas cylinder connector (002) and squeezes the tip (101) of the valve stem, causing the valve stem to move backward as a whole. The sealing ring (301) on the stem head (102) disengages from the inner wall of the first section (201) of the air intake chamber in the gas cylinder connector (002), realizing the connection between the first section (201) of the air intake chamber and the second section (202) of the air intake chamber in the valve body (001). When the pressure in the air intake chamber changes, the valve stem moves along the rod groove (203) under the combined action of the spring force (401) and the pressure in the chamber. By controlling the contact or disengagement state of the sealing ring (301) and the inner wall of the first section (201) of the air intake chamber, the air intake channel is closed or connected. When the pressure in the air intake chamber is greater than the set threshold, the pressure in the chamber is greater than the adsorption force of the gas cylinder connector (002) on the gas cylinder, and the gas cylinder pops out.

2. A gas valve for a cartridge heater as defined in claim 1, wherein: When the gas valve is in normal use, the pressure inside the valve body (001) is 0.2-0.4 MPa. At this time, the sealing ring (301) on the rod head (102) is separated from the inner wall of the first section (201) of the air intake chamber, and the air intake channel remains connected.

3. A gas valve for a cartridge heater as defined in claim 1, wherein: When the pressure in the intake chamber is 0.4-0.6 MPa, the valve stem moves forward under the action of the spring force (401) and the pressure in the chamber. The sealing ring (301) on the stem head (102) contacts the inner wall of the first section (201) of the intake chamber, the intake passage is closed, and the gas cylinder does not pop out.

4. A gas valve for a cartridge heater as defined in claim 1, wherein: When the pressure in the intake chamber is between 0.6 and 1 MPa, the pressure in the intake chamber is greater than the suction force of the gas cylinder connector (002) to adsorb the gas cylinder, and the gas cylinder pops out.

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