Gas valve for portable gas stove

Abstract

The gas valve comprises a valve body and a gas cylinder connector arranged on the valve body, a valve rod is arranged in the valve body, and the valve rod comprises a rod tip, a rod head and a rod body; the rod tip is used for being in contact fit with a gas nozzle of a gas cylinder. The rod head is provided with a sealing ring, and the sealing ring is used for being in sealing fit with the inner wall of a first section of a gas inlet cavity in the gas cylinder connector; the rod body is sleeved with a spring, one end of the spring abuts against a limiting ring on the rod body, and the other end of the spring abuts against the bottom end of a rod groove formed in the valve body. A through hole allowing the rod tail of the valve rod to freely penetrate through is formed in the bottom of the rod groove. The safety protection device has the beneficial effects that the structure is simple and compact, an additional power source is not needed, and multiple safety protection can be achieved only through cooperation of mechanical parts; the pressure adjusting range is accurate, and the working pressure requirement of a common portable gas stove is met; the overvoltage protection response is rapid, safety accidents such as gas leakage and explosion can be effectively avoided, and the portable gas stove is suitable for various scenes such as families and outdoors.

Description

Technical Field

[0001] The present invention relates to the technical field of cartridge stoves, and in particular to a gas valve for cartridge stoves. Background Art

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

[0003] At present, the common gas valves for cassette stoves on the market have the following major technical defects: traditional gas valves mostly use manual switches to control the on and off of gas, and users need to rotate or press to achieve gas supply, which is less convenient to operate; and when the pressure in the gas cylinder rises abnormally (such as gas expansion due to temperature increase), the pressure cannot be automatically adjusted, which can easily cause gas leakage or burner backfire and other problems. Although some gas valves have simple overpressure protection functions (such as closing the air inlet channel by tightening the seal with a spring), they can only cut off the gas source within a certain pressure range; when encountering extreme overpressure conditions (such as a sudden increase in pressure due to internal explosion or severe blockage in the gas cylinder), the closed seal may fail due to excessive pressure, and gas may still leak through the gap, and the safety hazard cannot be completely eliminated. The structural design of existing gas valves is generally more complex and requires multiple independent components to work together. This not only increases manufacturing costs, but may also cause functional failure due to component wear or assembly errors. The reliability needs to be improved.

[0004] Therefore, it is necessary to develop a gas valve for cassette furnaces with a simple structure, convenient operation and multiple safety protection mechanisms to solve the problems of pressure regulation lag, incomplete overpressure protection and complex structure in the existing technology. Summary of the Invention

[0005] The main technical problem solved by the present invention is to provide a gas valve for a cassette stove, which solves one or more of the above-mentioned problems in the prior art.

[0006] To solve the above technical problems, the present invention adopts a technical solution: a gas valve for a gas stove, comprising a valve body and a gas cylinder connector provided on the valve body, wherein the innovation lies in: a valve stem is provided 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; the stem head is provided with a sealing ring, which is used to seal and cooperate with the inner wall of the first section of the gas inlet cavity in the gas cylinder connector; a spring is provided on the outer sleeve of the stem body, one end of the spring abuts against a limit ring on the stem body, and the other end abuts against the bottom end of a stem groove provided in the valve body; a through hole is provided at the bottom of the stem groove for the stem tail to freely pass through;

[0007] When the gas cylinder is docked with the gas cylinder connector, the gas nozzle of the gas cylinder passes through the docking port of the gas cylinder connector and squeezes the tip of the valve stem, causing the valve stem to move backward as a whole, and the sealing ring on the rod head separates from the inner wall of the first section of the air inlet chamber in the gas cylinder connector, thereby realizing the connection between the first section of the air inlet chamber and the second section of the air inlet chamber in the valve body; when the pressure in the air inlet chamber changes, the valve stem moves along the rod groove under the combined action of the spring force and the pressure in the chamber, and realizes the closure or connection of the air inlet channel by controlling the contact or separation state of the sealing ring and the inner wall of the first section of the air inlet chamber; when the pressure in the air inlet chamber is greater than the set threshold, the pressure in the chamber is greater than the adsorption force of the gas cylinder connector on the gas cylinder, and the gas cylinder pops out.

[0008] In some embodiments, when the gas valve is in normal use, the pressure in 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 cavity, and the air intake channel remains connected.

[0009] In some embodiments, when the pressure in the air intake chamber is 0.4-0.6 MPa, the valve stem moves forward under the action of the spring force and the pressure in the chamber, the sealing ring on the rod head contacts the inner wall of the first section of the air intake chamber, the air intake channel is closed, and the gas cylinder does not pop out.

[0010] In some embodiments, when the pressure in the air intake chamber is between 0.6 MPa and 1 MPa, the pressure in the air intake chamber is greater than the suction force of the gas cylinder connector to adsorb the gas cylinder, and the gas cylinder pops out.

[0011] The beneficial effects of the present invention are: simple and compact structure, no additional power source required, and multiple safety protections can be achieved only through the cooperation of mechanical components; the pressure adjustment range is precise (0.2-0.6 MPa), which is adapted to the working pressure requirements of common cassette stoves; the overpressure protection responds quickly, which can effectively avoid gas leakage, explosion and other safety accidents, and is suitable for cassette stove equipment in various scenarios such as home and outdoor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which:

[0013] Figure 1 It is a structural schematic diagram of a gas valve for a cartridge furnace according to the present invention.

[0014] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a gas valve for a cartridge furnace. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] like Figure 1 and Figure 2 As shown, an embodiment of the present invention includes: a gas valve for a portable stove, which is mainly composed of a valve body 001, a gas cylinder connector 002 arranged 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 material (such as copper alloy or stainless steel), one side of which is connected to the gas pipeline of the gas stove, and the other side is fixedly connected to the gas cylinder connector 002 by threading or clamping; the gas cylinder connector 002 is a cylindrical structure with an open end, and the open end is used to dock with the end of the gas cylinder. A stepped air inlet cavity is opened axially inside the structure, and the air inlet cavity 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 body 103, which is inserted into the valve body 001 along the axial direction of the valve body 001. Its structure is divided into three parts: the front end is the rod tip 101 (hemispherical or conical to reduce the contact area and disperse the pressure) that contacts the gas nozzle of the gas cylinder; the middle section is the rod head 102 (the diameter is larger than the rod body 103, forming a stepped surface), and the outer circumference of the rod head 102 is provided with an annular groove, and the sealing ring 301 (made of high-pressure resistant rubber material, such as fluororubber) is embedded in the groove for sealing with the inner wall of the first section 201 of the air inlet cavity; the rear end is the rod body 103, and the outer circumference of the rod body 103 is provided with a limiting ring 402 (which can be formed by turning or welding).

[0019] A rod groove 203 is provided inside the valve body 001 at a position corresponding to 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 in the axial direction; the spring 401 is a compression spring 401, which is sleeved on the outside of the rod body 103, with one end abutting against the rear end face of the limit ring 402, and the other end abutting against the bottom end of the rod groove 203, so as 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 rod tail 104 of the valve stem) is also provided at the bottom of the rod groove 203 to allow the rod tail 104 of the valve stem to pass through freely when moving, so as to avoid the formation of air pressure obstruction in the rod groove 203.

[0020] When the gas cylinder is docked with the gas cylinder connector 002, the gas nozzle of the gas cylinder passes through the open end of the gas cylinder connector 002, contacts the stem tip 101 of the valve stem, and applies axial pressure. Due to the hemispherical design of the stem tip 101, the pressure is concentrated and uniform during contact, effectively preventing the gas nozzle from deforming due to excessive local force. At this time, the valve stem as a whole 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 inlet cavity (i.e., the sealing ring 301 moves to the position of the second section 202 of the air inlet cavity). At this point, the first section 201 of the air inlet cavity is connected to the air inlet channel inside the valve body 001, and the gas in the gas cylinder can enter the valve body 001 through the air inlet cavity and is ultimately delivered to the gas burner.

[0021] This structure achieves the conduction of the air intake channel through direct contact between the valve stem and the gas nozzle, avoiding the cumbersome additional operations required for traditional gas valves and improving the convenience of use; at the same time, the design of the hemispherical rod tip 101 can extend the service life of the gas nozzle.

[0022] A protection component is also provided on the valve body 001, which includes a protection bracket, a protection plate and a protection spring provided between the protection bracket and the protection plate. The protection spring gives the protection plate and the protection bracket tension. The middle part of the protection plate is hinged to the protection bracket, and the end of the protection plate is provided with a positioning hole for the rod tail 104 to pass through. The protection component also includes a limit groove provided on the rod body 103. When the pressure in the valve body 001 rises to 0.4-0.6 MPa, the valve stem moves backward and the end of the protection plate will be stuck in the limit groove. If the external environment returns to normal and the pressure in the valve body 001 drops to 0.2-0.4 MPa, it is necessary to manually press the protection plate to disengage it from the limit groove, so that the valve stem will return to normal use and the gas cylinder will resume gas supply.

[0023] During normal use (the pressure inside the valve body 001 is 0.2-0.4 MPa), the backward pressure generated by the gas is less than the forward elastic force of the spring 401, the valve stem remains in the backward state, the sealing ring 301 is separated from the first section 201 of the air inlet chamber, and the air inlet channel remains open; when the pressure inside the valve body 001 rises to 0.4-0.6 MPa due to external factors (such as an abnormal increase in the pressure inside the gas cylinder or a blockage in the burner), the backward pressure of the gas gradually increases and approaches the elastic force of the spring 401. The valve stem slowly moves forward under the push of the spring 401 until the sealing ring 301 is tightly fitted with the inner wall of the first section 201 of the air inlet chamber again, the air inlet channel is closed, and the gas supply stops. At this time, because the adsorption force of the gas cylinder connector 002 on the gas cylinder (such as achieved through the internal elastic claws or magnetic structure) is greater than the pressure inside the cavity, the gas cylinder will not pop out.

[0024] The automatic adjustment function of the gas valve is achieved through the dynamic balance between the spring 401 and the pressure in the cavity. The gas source can be cut off in time when the gas pressure rises abnormally, avoiding gas leakage or equipment damage caused by excessive pressure, and significantly improving the safety of use.

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

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

[0027] The gas valve for a cassette stove described in the present invention realizes automatic control of the entire process of "docking-pressure regulation-overpressure protection" through the coordinated action of the valve stem, spring 401, sealing ring 301 and gas cylinder connector 002: the gas supply is automatically turned on when the gas cylinder is docked; the air intake channel is automatically closed when the pressure rises abnormally; and the gas cylinder is automatically ejected when extreme overpressure occurs.

[0028] The advantages of this technical solution are:

[0029] (1) The structure is simple and compact, and no additional power source is required. Multiple safety protections can be achieved only through the coordination of mechanical components.

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

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

[0032] The above description is merely a specific embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by utilizing the contents of the present invention description and drawings, or directly or indirectly applied to other related technical fields, shall be included in the scope of the present invention.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gas valve for a portable stove, comprising a valve body (001) and a gas cylinder connector (002) disposed on the valve body (001), characterized in that: A valve stem is provided in the valve body (001), and the valve stem comprises a stem tip (101), a stem head (102) and a stem body (103); the stem tip (101) is used for contacting and cooperating with the gas nozzle of the gas cylinder; the stem head (102) is provided with a sealing ring (301), and the sealing ring (301) is used for sealing and cooperating with the inner wall of the first section (201) of the gas inlet cavity 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) is abutted against the limit ring (402) on the stem body (103), and the other end is abutted against the bottom end of the stem groove (203) provided in the valve body (001); a through hole is provided at the bottom of the stem groove (203) for the stem tail (104) of the valve stem to freely pass through; When the gas cylinder is docked with the gas cylinder connector (002), the gas nozzle of the gas cylinder passes through the docking port of the gas cylinder connector (002) and squeezes the rod tip (101) of the valve stem, causing the valve stem to move backward as a whole, and the sealing ring (301) on the rod head (102) is separated from the inner wall of the first section (201) of the gas inlet cavity in the gas cylinder connector (002), thereby achieving communication between the first section (201) of the gas inlet cavity and the second section (202) of the gas inlet cavity in the valve body (001); when the pressure in the gas inlet cavity changes, the valve stem moves along the rod groove (203) under the combined action of the elastic force of the spring (401) and the pressure in the cavity, and the closing or communication of the gas inlet channel is achieved by controlling the contact or separation state of the sealing ring (301) and the inner wall of the first section (201) of the gas inlet cavity; when the pressure in the gas inlet cavity is greater than a set threshold, the pressure in the cavity 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 portable stove according to claim 1, characterized in that: When the gas valve is in normal use, the pressure in 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 inlet cavity, and the air inlet channel remains connected.

3. The gas valve for a portable stove according to claim 1, characterized in that: When the pressure in the air inlet chamber is 0.4-0.6 MPa, the valve stem moves forward under the action of the elastic force of the spring (401) and the pressure in the chamber, the sealing ring (301) on the rod head (102) contacts the inner wall of the first section (201) of the air inlet chamber, the air inlet channel is closed, and the gas cylinder does not pop out.

4. The gas valve for a portable stove according to claim 1, characterized in that: When the pressure in the air intake cavity is between 0.6 and 1 MPa, the pressure in the air intake cavity is greater than the suction force of the gas cylinder connector (002) adsorbing the gas cylinder, and the gas cylinder pops out.

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