Flame gun and flame gun air valve

Abstract

The utility model relates to the technical field of air valves, in particular to a flame gun air valve structure and a flame gun. According to the flame gun air valve, a gas channel is disconnected through sealing of the elastic sealing piece, compared with sealing achieved through contact extrusion deformation of a valve element and a valve body at present, abrasion is avoided through sealing of the elastic sealing piece, and the position change of closing of the valve element every time is small. The position of the elastic sealing piece can be installed between the valve element and the valve body, the air channel is controlled to be opened and closed through integral movement of the valve element, the elastic sealing piece can also be installed in the valve element, and the valve element channel in the valve element is communicated with the air channel, so that opening and closing of the valve element channel are controlled through the inner core and the elastic sealing piece, and control over the air channel can be achieved. The inner core and the valve core body are sealed through the elastic sealing piece, abrasion is light, and the change of the closing position of the inner core every time is small. After the gas channel is opened, the valve element can movably adjust the through-flow area of the gas channel relative to the valve body, and then the gas flow in the gas channel is adjusted.

Description

Technical Field

[0001] The present application relates to the technical field of gas valves, and particularly relates to a blowtorch and a gas valve for a blowtorch. Background Art

[0002] The gas valve of a blowtorch includes a valve body and a valve core. The valve core is connected to the valve body by a thread. By screwing the valve core, the gas flow rate can be adjusted. When using the blowtorch to ignite, a certain amount of gas needs to be opened, and then the gas flow is ignited in cooperation with the ignition switch. When igniting, if the gas flow rate of the outlet gas is too large, the ignition is likely to fail. Currently, when the blowtorch is closed, a certain torque is required to tighten the valve core so that the contact surface between the valve core and the valve body is squeezed and deformed to achieve sealing. This sealing method easily causes serious wear at the contact position between the valve core and the valve body, resulting in a large change in the position of the valve core when it is closed, and it is not easy to control the gas outlet volume during ignition, and the stability is poor. Utility Model Content

[0003] The present application provides a blowtorch for improving the problem that the stability of the gas outlet volume during ignition is poor due to serious wear between the valve core and the valve body of the gas valve of the current blowtorch.

[0004] In addition, the purpose of the present application is also to provide a gas valve for the above-mentioned blowtorch.

[0005] In a first aspect, in one embodiment, a blowtorch is provided, including a handle and a gun body connected to the handle. A gas valve is provided in the gun body. The gas valve is used to connect a gas cylinder. The gas valve includes:

[0006] A valve body having a gas passage for the combustible gas to flow out;

[0007] A valve core connected to the valve body. At least part of the valve core can move to control the on-off of the gas passage; the valve core has a closed state and an open state;

[0008] And an elastic seal. In the closed state, the elastic seal disconnects the gas passage; in the open state, the elastic seal releases the seal to open the gas passage;

[0009] When the valve core moves relative to the valve body in the open state, the valve core adjusts the gas flow rate in the gas passage by changing the flow area of the gas passage.

[0010] Further, in one embodiment, at least part of the gas passage is formed between the valve core and the valve body. The valve core can move relative to the valve body to control the opening and closing of the gas passage. The elastic seal is arranged between the valve core and the valve body. In the closed state, the valve core is sealed with the valve body through the elastic seal to disconnect the gas passage; in the open state, the valve core and the valve body are unsealed to open the gas passage.

[0011] Further, in one embodiment, the valve core includes a sealing section and a flow regulating section. The valve core contacts the elastic seal through the sealing section, and the valve core changes the flow area of the gas passage through the flow regulating section; the flow regulating section is upstream or downstream of the sealing section.

[0012] Further, in one embodiment, the valve body includes a zero position regulator and a base body. The zero position regulator is adjustably installed on the base body. The valve core adjusts the gas flow in the gas passage by changing the gap between the valve core and the zero position regulator. When the valve core is in the closed position, it contacts the zero position regulator.

[0013] Further, in one embodiment, the zero position regulator has a regulator hole for the valve core to insert; when the valve core is in the closed state, it blocks the regulator hole; when the valve core is in the open state, a gap is formed between the valve core and the regulator hole, and the flow area of the gas passage is changed by adjusting the size of the gap.

[0014] Further, in one embodiment, the zero position regulator is threadedly connected to the base body.

[0015] Further, in one embodiment, at least part of the gas passage is a valve core passage formed in the valve core. The valve core includes a valve core body, an inner core and an elastic seal. The inner core is movably installed in the valve core body, and the inner core can move relative to the valve core body to control the opening and closing of the valve core passage;

[0016] When the valve core is in the closed state, the inner core is sealed with the valve core body through the elastic seal to disconnect the valve core passage; when the valve core is in the open state, the inner core and the valve core body are unsealed to open the valve core passage;

[0017] The valve core body can move relative to the valve body; when the valve core is in the open state, the valve core body can adjust the gas flow in the gas passage by changing the flow area of the gas passage.

[0018] Further, in one embodiment, the valve core is threadedly connected to the valve body so that the valve core moves relative to the valve body by screwing the valve core.

[0019] Further, in one embodiment, the valve core includes an elastic member for applying an elastic force to the inner core to keep the inner core in a state of disconnecting the valve core passage. The blowtorch includes an operating member for moving the inner core to an open state of the valve core passage by pressing the inner core.

[0020] In a second aspect, a blowtorch gas valve is provided in one embodiment, including:

[0021] A valve body having a gas passage for the outflow of combustible gas;

[0022] A valve core connected to the valve body, at least part of the valve core moves to control the opening and closing of the gas passage; the valve core has a closed state and an open state;

[0023] And an elastic seal. In the closed state, the elastic seal disconnects the gas passage; in the open state, the elastic seal releases the seal to open the gas passage;

[0024] When the valve core moves relative to the valve body in the open state, the valve core adjusts the gas flow rate in the gas passage by changing the flow area of the gas passage.

[0025] According to the blowtorch of the above embodiment, relying on the seal of the elastic seal to achieve the disconnection of the gas passage. Compared with the current seal achieved by the contact extrusion deformation between the valve core and the valve body, the seal by the elastic seal will not wear, and the position change of the valve core when closed is small. After the gas passage is opened, the valve core of the present application can move relative to the valve body to adjust the flow area of the gas passage, thereby adjusting the gas flow rate in the gas passage.

[0026] Further, the position of the elastic seal can be installed either between the valve core and the valve body to control the opening and closing of the gas passage by the overall movement of the valve core, or installed inside the valve core to control the opening and closing of the valve core passage by the inner core and the elastic seal, which can achieve the control of the gas passage. The inner core and the valve core body are sealed by the elastic seal, and the wear is also relatively light, and the position change of the inner core when closed is also relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a blowtorch in one embodiment;

[0028] Figure 2 It is a front view of a blowtorch in one embodiment;

[0029] Figure 3Cross-sectional view of a blowtorch in an embodiment;

[0030] Figure 4 is Figure 3 an enlarged view of part A in;

[0031] Figure 5 Exploded view of the internal structure of a blowtorch in an embodiment;

[0032] Figure 6 Schematic diagram of the structure of the gas valve of a blowtorch in another embodiment (the arrows in the figure indicate the flow direction of the fuel gas).

[0033] Figures 1 to 5 List of the names of the features corresponding to the reference numerals in the figure: 1. Gun body; 11. Handle; 12. Operation key; 13. Flame outlet; 2. Gas valve; 21. Valve body; 211. Gas passage; 212. Zero position regulator; 2121. Regulator hole; 213. Base body; 214. Air inlet hole; 215. Second air passage; 216. Air outlet hole; 22. Valve core; 221. Sealing section; 222. Flow rate adjustment section; 2221. Conical surface; 23. Elastic seal; 24. Check valve; 25. Knob; 3. Thrust piece; 4. Gas cylinder.

[0034] Figure 6 List of the names of the features corresponding to the reference numerals in the figure: 20. Gas valve; 220. Valve core; 2201. Valve core body; 22011. Core body adjustment section; 22012. Conical surface; 22013. Core rod mounting hole; 22014. Annular flange; 2202. Inner core; 22021. Core rod; 2203. Elastic seal; 2204. Valve core passage; 2205. Elastic member; 210. Valve body; 2101. Gas passage; 201. Operating member; 216. Air outlet hole.

[0035] Explanation of the reference numerals with brackets in the drawings: Among the reference numerals with brackets in the drawings, the feature referred to by the reference numeral is both the feature represented by the number inside the brackets and the feature represented by the number outside the brackets. Detailed implementation manner

[0036] The present application will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings. Similar elements in different embodiments are denoted by related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and the general technical knowledge in the art.

[0037] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment, and do not mean that they are the necessary sequences, unless it is stated otherwise that a certain sequence must be followed.

[0038] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct connection, indirect connection, and contact connection (coupling), etc.

[0039] When using a blowtorch to fire, it is necessary to open a certain amount of gas and cooperate with the ignition switch. After ignition, the flame is ejected along with the air flow. In actual use, if the gas outlet flow rate of the blowtorch is set too large at the beginning, due to the excessive air flow, the fire cannot be ignited instead. In the current blowtorch gas valve, the valve core and the valve body wear relatively fast, and the change in the ignition position is relatively large, usually unable to maintain at the set position. The present application provides a new sealing method to reduce the wear between the valve core and the valve body and make the change in the ignition position smaller.

[0040] In one embodiment, please refer to Figures 1 to 3 , the blowtorch includes a handle 11 and a gun body 1 connected to the handle 11. A gas valve 2 is provided in the gun body 1, and the gas valve 2 is used to connect to a gas cylinder 4.

[0041] In one embodiment, please refer to Figures 3 to 5, the gas valve 2 includes a valve body 21, a valve core 22 and an elastic seal 23. The valve body 21 has a gas passage 211 for the combustible gas to flow out. The valve core 22 is connected to the valve body 21, and at least part of the valve core 22 can move to control the opening and closing of the gas passage 211. The valve core 22 has a closed state and an open state. In the closed state, the elastic seal 23 disconnects the gas passage 211; in the open state, the elastic seal 23 releases the seal to open the gas passage 211.

[0042] When the valve core 22 moves relative to the valve body 21 in the open state, the valve core 22 adjusts the gas flow rate in the gas passage 211 by changing the flow area of the gas passage 211.

[0043] It should be noted that the change between the closed state and the open state of the valve core 22 includes both the change in the overall position of the valve core 22. For example, the valve core is in different positions belonging to the closed state and the open state respectively, and also includes the change in the position of a part of the valve core 22. For example, a part of the valve core is in different positions, causing the valve core to be in the closed state and the open state respectively, while another part of the valve core may not change in position. The valve core 22 can be of any feasible structural form, and the typical structure of the valve core will be described in detail below with reference to the drawings.

[0044] Specifically, in one embodiment, please refer to Figures 3 to 5 , at least part of the gas passage 211 is formed between the valve core 22 and the valve body 21, and the elastic seal 23 is arranged between the valve core 22 and the valve body 21. The valve core 22 can move relative to the valve body 21 as a whole to control the opening and closing of the gas passage 211. The valve core 22 has a closed state and an open state during the movement stroke relative to the valve body 21 as a whole. In the closed state, the valve core 22 seals with the valve body 21 through the elastic seal 23 to disconnect the gas passage 211. In the open state, the valve core 22 releases the seal with the valve body 21 to open the gas passage 211. Since the valve core 22 and the valve body 21 are sealed by the elastic seal 23 and the elastic seal 23 can elastically deform, when closing the gas passage 211, there is no need for hard extrusion deformation sealing between the valve core 22 and the valve body 21. The valve core 22 and the valve body 21 no longer directly contact, but achieve the sealing effect by extruding the elastic seal 23 between them. In this way, the sealing position between the valve core 22 and the valve body 21 will not be worn, and the torque required to compress the elastic seal 23 is also greatly reduced. The relative position change between the valve body 21 and the valve core 22 is small or even unchanged each time the valve core 22 is closed, making it easier to control the gas output during ignition and improving the stability of the gas valve.

[0045] In addition, when the valve core 22 is in the open state, the valve core 22 moves relative to the valve body 21, threading the flow area of the gas passage 211, thereby adjusting the gas flow rate in the gas passage 211 to achieve the adjustment of the gas flow rate.

[0046] In summary, since the valve body 21 and the valve core 22 do not close the air valve by direct contact, but by compressing the elastic seal 23 between them. This enables the valve core 22 to return to the same position every time the air valve is closed, rather than having an unfixed starting position like the current conventional air valve of a blowtorch. This makes it convenient to make marks for the user, such as the gas closing position and the current gas volume, and the air valve can be opened and closed with a smaller torque, improving the user experience. At the same time, it can also avoid wear between the valve core 22 and the valve body 21, improving the service life and safety.

[0047] Regarding the connection between the valve core 22 and the valve body 21, they can adopt any feasible method. For example, in one embodiment, please refer to Figure 3 and Figure 4 , the valve core 22 is threadedly connected to the valve body 21. At this time, by screwing the valve core 22, the valve core 22 can rotate circumferentially relative to the valve core 22, and at the same time, the valve core 22 can move axially relative to the valve body 21. For another example, in one embodiment, the valve core 22 is swingably mounted on the valve body 21. Specifically, in order to keep the valve core 22 in the closed state, the air valve 2 includes an elastic member that applies an elastic force to the valve core 22. When the valve core 22 needs to be opened, it is necessary to push or pull the valve core 22 to swing to the open state.

[0048] In one embodiment, please refer to Figure 3 and Figure 4 , the valve core 22 includes a sealing section 221 and a flow rate regulating section 222. The valve core 22 contacts the elastic seal 23 through the sealing section 221, and the valve core 22 changes the flow area of the gas passage 211 through the flow rate regulating section 222. In the gas flow direction of the gas passage 211, the flow rate regulating section 222 is located upstream or downstream of the sealing section 221. The sealing section 221 and the flow rate regulating section 222 are arranged in sections, which is more convenient for the installation of the elastic seal 23. In some other embodiments, the flow area of the gas passage 211 can also be adjusted by adjusting the gap between the elastic seal 23 and the valve body 21. In some embodiments, the elastic seal 23 can also be provided on the flow rate regulating section 222 or on the valve body 21, and the elastic seal 23 is cooperatively sealed by the extrusion of the flow rate regulating section 222 and the valve body 21. For example, a groove is provided on the flow rate regulating section 222, and the elastic seal 23 is provided in the groove; or a groove is provided on the valve body, and the elastic seal 23 is provided in the groove. As long as the elastic seal 23 is provided between the valve body 21 and the valve core 22.

[0049] Specifically, in one embodiment, please refer to Figure 3 and Figure 4, the valve core 22 is in a long strip shape extending along the first direction, and the sealing section 221 and the flow regulating section 222 are arranged in sections along the first direction. The valve core 22 can move relative to the valve body 21 along the first direction. Specifically, the movement of the valve core 22 relative to the valve body 21 along the first direction can be any feasible movement form. For example, the valve core 22 is threadedly connected to the valve body 21, and by rotating the valve core 22 in the forward and reverse directions, the valve core 22 can reciprocate in the first direction. Another example is that the valve core 22 can also move along the first direction, and the valve core 22 is slidably matched with the valve body 21, such as driving the valve core 22 to move translationally through a gear-rack mechanism. In one embodiment, the first direction is the extending direction of the rotation axis of the valve core 22.

[0050] Specifically, in one embodiment, please refer to Figure 3 and Figure 4 , the air valve 2 includes a knob 25, and the knob 25 is in anti-rotation cooperation with the valve core 22. The valve core 22 can be operated by operating the knob 25. In one embodiment, the knob 25 is rotatably assembled on the valve body 21 or the gun body 1. Since the valve core 22 moves along the first direction after being screwed, in order to maintain the reliability of the assembly relationship between the knob 25 and the valve body 21 or the gun body 1, the knob 25 and the valve core 22 can move relative to each other along the first direction, and there is an activity space in the knob 25 for the valve core 22 to move along the first direction.

[0051] In one embodiment, please refer to Figure 4 and Figure 5 , the elastic seal 23 is an elastic sealing ring sleeved on the sealing section 221. Specifically, the sealing section 221 has a mounting groove, and the elastic sealing ring is installed in the mounting groove. In some other embodiments, the elastic seal 23 can also be a gasket or a sealing ring fixed on the valve body 21.

[0052] In one embodiment, please refer to Figure 3 and Figure 4 , for the convenience of installing the air valve 2, the valve body 21 includes a zero position adjuster 212 and a base body 213. The zero position adjuster 212 is installed on the base body 213 with adjustable position. The valve core 22 adjusts the gas flow in the gas passage 211 by changing the gap with the zero position adjuster 212, and the valve core 22 contacts the zero position adjuster 212 when in the closed position. During installation, the zero position adjuster 212 can be adjusted according to needs, which can reduce the influence of part processing errors on the accuracy of the air valve and ensure the consistency of the same products.

[0053] In one embodiment, during the assembly of the air valve, first complete the assembly of the valve body 21, the valve core 22, and the elastic seal 23, and make the relative positions of the three in the state when the air valve is sealed, and then install the zero position adjuster 212.

[0054] Specifically, in one embodiment, please refer to Figure 3 andFigure 4 The zero - position adjuster 212 is threadedly connected to the base body 213. In one embodiment, the flow - regulating section 222 has a conical surface 2221. When the valve core 22 is in the closed state, the conical surface 2221 contacts the zero - position adjuster 212.

[0055] In one embodiment, please refer to Figure 3 and Figure 4 , the zero - position adjuster 212 has a regulator hole 2121 for the valve core 22 to insert. When the valve core 22 is in the closed state, the regulator hole 2121 is blocked. The regulator hole 2121 forms a part of the gas passage 211. When the valve core 22 is in the open state, a gap is formed between the valve core 22 and the regulator hole 2121. By adjusting the size of the gap, the flow - through area of the gas passage 211 is changed. Specifically, in one embodiment, please refer to Figure 3 and Figure 4 , when the valve core 22 is in the closed state, the conical surface 2221 blocks the regulator hole 2121. After the valve core 22 is opened, the conical surface 2221 opens the regulator hole 2121, and as the valve core 22 moves axially, the gap between the conical surface 2221 and the regulator hole 2121 gradually increases, thereby gradually increasing the flow - through area of the gas passage 211.

[0056] During installation, the zero - position adjuster 212 is screwed in by thread - fitting with a certain torque until the regulator hole 2121 of the zero - position adjuster 212 just contacts the valve core 22, completing the assembly.

[0057] In one embodiment, please refer to Figure 3 , the base body 213 has an air inlet hole 214, and the air inlet hole 214 forms a part of the gas passage 211. The zero - position adjuster 212 is loaded from the air inlet hole 214. The air inlet hole 214 has internal threads, and the outer periphery of the zero - position adjuster 212 has external threads.

[0058] In one embodiment, please refer to Figure 3 and Figure 4 , the valve body 21 also has a second air passage 215, and a check valve 24 is provided on the second air passage 215. After the check valve 24 is opened, the combustible gas can flow out through the second air passage 215. It should be noted that the check valve 24 of the second air passage 215 does not need to adjust the flow rate. After the check valve 24 is opened, the gas flow rate of the second air passage 215 can reach the maximum, thereby realizing the function of quickly starting a large - fire of the blowtorch with one key.

[0059] Specifically, in one embodiment, please refer to Figure 3 and Figure 4 , the valve body 21 has an air outlet hole 216, and the air outlet hole 216 forms a part of the gas passage 211. The air inlet hole 214 is upstream of the air outlet hole 216. One end of the second air passage 215 is communicated with the air inlet hole 214, and the other end is communicated with the air outlet hole 216.

[0060] To balance the weight before and after the blowtorch so that it can stand after the gas cylinder 4 is installed on the blowtorch, in one embodiment, please refer to Figures 1 to 3 , the gun body 1 extends in the second direction, and the gas valve 2 is located in the middle of the gun body 1 in the second direction.

[0061] An operation key 12 is provided on the handle 11, and the operation key 12 operates the check valve 24 through a transmission mechanism. In the second direction, the flame outlet 13 of the blowtorch is at one end of the gun body 1, and the handle 11 is at the other end of the gun body 1. This layout can be placed vertically on a plane after the gas cylinder 4 is installed, improving the use experience and safety. In one embodiment, the first direction is perpendicular to the second direction.

[0062] In one embodiment, please refer to Figure 3 , the transmission mechanism includes a pushing member 3. By pressing the operation key 12, the operation key 12 applies a force to the pushing member 3, causing the pushing member 3 to push the check valve 24, and the check valve 24 opens the second air passage 215 to realize the function of one-key opening of the high fire.

[0063] After igniting by opening a certain amount of gas through the gas passage 211, the user can choose to slowly adjust the size of the fire through the knob 25, or directly press the operation key 12 to instantly allow the gas to pass through the second air passage 215 to reach the maximum gas volume to achieve high fire. Before igniting through the gas passage 211, even if the operation key 12 of the second air passage 215 is pressed, ignition cannot be achieved because when using one-key high fire, the gas volume is too large to achieve the ignition function.

[0064] In addition to the above-mentioned sealing method in which the valve core 22 and the valve body 21 are sealed by the elastic seal 23, in one embodiment, please refer to Figure 6 , the present application provides another gas valve 20, which is different from the gas valve 20 in the above embodiment in that:

[0065] At least part of the gas passage 2101 is a valve core passage 2204 formed in the valve core 220. The valve core 220 includes a valve core body 2201, an inner core 2202 and an elastic seal 2203. The inner core 2202 is movably installed in the valve core body 2201, and the inner core 2202 can move relative to the valve core body 2201 to control the on-off of the valve core passage 2204. The movement of the inner core 2202 relative to the valve core body 2201 changes the state of the valve core 220. When the valve core 220 is in the closed state, the inner core 2202 is sealed with the valve core body 2201 through the elastic seal 2203 to disconnect the valve core passage 2204; when the valve core 220 is in the open state, the inner core 2202 is unsealed from the valve core body 2201 to open the valve core passage 2204.

[0066] The valve core body 2201 can move relative to the valve body 210 as a whole; when the valve core 220 is in the open state, the valve core body 2201 can adjust the gas flow rate in the gas passage 2101 by changing the flow area of the gas passage 2101.

[0067] The main difference from the above embodiment is that at least part of the gas passage 2101 in this embodiment is the valve core passage 2204 formed in the valve core 220, and then an inner core 2202 is arranged in the valve core 220 to control the on-off of the valve core passage 2204, so as to control the on-off of the entire gas passage 2101. When it is necessary to regulate the gas flow rate of the gas passage 2101, the valve core 220 needs to move relative to the valve body 210. The advantage of this structure is that the inner core 220, which controls the on-off of the gas passage 2101, is pre-installed in the valve core 220, simplifying the assembly relationship between the valve core 220 and the valve body 210. Since the inner core 2202 and the valve core body 2201 are sealed by an elastic seal 2203, they do not need to be tightened and deformed for sealing, and the wear is small. It can also make the position change of the valve core 220 small or even unchanged each time it is closed, making it easier to control the gas output during ignition and improving the stability of the air valve.

[0068] Further, in one embodiment, please refer to Figure 6 , the valve core 220 includes an elastic member 2205, and the elastic member 2205 is used to apply an elastic force to the inner core 2202 to keep the inner core 2202 in a state of blocking the valve core passage 2204. The air valve 20 includes an operating member 201, and the operating member 201 moves the inner core 2202 to the state of opening the valve core passage 2204 by pressing the inner core 2202. The elastic member 2205 facilitates keeping the inner core 2202 blocking the valve core passage 2204. In some other embodiments, the operating member 201 can also move the inner core 2202 by pulling the inner core 2202.

[0069] Further, in one embodiment, please refer to Figure 6 , the valve core body 2201 is threadedly connected to the valve body 210, and by screwing the valve core 220, the valve core 220 can move relative to the valve body 210, thereby adjusting the gas flow rate. Specifically, in one embodiment, by rotating the valve core body 2201, the valve core body 2201 can move relative to the valve body 210 in a first direction, thereby adjusting the gap between the valve core body 2201 and the valve body 210 and changing the flow area of the gas passage 2101. Wherein, the first direction is the extending direction of the rotation center line of the valve core body 2201.

[0070] Specifically, in one embodiment, please refer to Figure 6, the valve core body 2201 includes a core body adjustment section 22011, the outer peripheral surface of the core body adjustment section 22011 is a conical surface 22012, the valve body 210 has a valve body hole for inserting the core body adjustment section 22011. Since the outer peripheral surface of the core body adjustment section 22011 is a conical surface 22012, when the core body adjustment section 22011 moves outward from the valve body hole, the gap between the core body adjustment section 22011 and the valve body 210 gradually increases, and the flow area of the gas passage 2101 also gradually increases. Therefore, by screwing the valve core body 2201, the valve core body 2201 rotates relative to the valve body 210. Since the valve core body 2201 is threadedly connected to the valve body 210, the valve core body 2201 can move relative to the valve body 210 in the first direction, and then the valve core body 2201 is inserted into the valve body hole or moves outward from the valve body hole, so as to achieve the purpose of adjusting the gas flow rate.

[0071] After the operating member 201 presses the inner core 2202 to the state of opening the valve core passage 2204, it is rotationally locked with the valve core body 2201 to be able to operate the valve core body 2201 to rotate. In order to maintain the position of the inner core 2202, the valve body 210 or the gun body has a blocking structure that prevents the operating member 201 from resetting under the action of the elastic member 2205 after the operating member 201 rotates, so that the inner core 2202 can be maintained in the state of opening the valve core passage 2204. When the inner core 2202 is in the state of opening the valve core passage 2204, the valve core 220 is in the open state.

[0072] Specifically, in one embodiment, please refer to Figure 6 , the operating member 201 is a knob, and the operating member 201 is rotationally locked with the valve core body 2201 through a transmission key or a flat structure. In one embodiment, the blocking structure includes a retaining cap (not shown in the figure). After the operating member 201 is pressed down, the inner core 2202 is pressed by the operating member 201 to the state of opening the valve core passage 2204. At this time, the operating member 201 is rotationally locked with the valve core body 2201. After the operating member 201 rotates a certain angle, it is in blocking cooperation with the retaining cap in the first direction. After the elastic force exerted by the elastic member 2205 on the inner core 2202 acts on the operating member 201, under the action of the retaining cap, the operating member 201 cannot be reset, and the inner core 2202 is maintained in the state of opening the valve core passage 2204. When it is necessary to close the inner core 2202, the operating member 201 is rotated to the original position. At this time, the retaining cap releases the blocking effect on the operating member 201. Under the elastic force of the elastic member 2205, the inner core 2202 and the operating member 201 are reset, and the inner core 2202 moves to the state of closing the valve core passage 2204. When the inner core 2202 is in the state of closing the valve core passage 2204, the valve core 220 is in the closed state.

[0073] Furthermore, in one embodiment, please refer to Figure 6, the inner core 2202 includes a core rod 22021. Both the elastic seal 2203 and the elastic member 2205 are sleeved on the core rod 22021. The operating member 201 presses the core rod 22021 to move the inner core 2202 to a state where the valve core passage 2204 is opened. In one embodiment, the elastic seal 2203 is an elastic washer, and the elastic member 2205 is a spring. In some other embodiments, in addition to using the elastic member 2205 to provide a force to the inner core 2202, a magnet can also be used to provide a force to the inner core 2202 to keep the inner core 2202 in a state of closing the valve core passage 2204.

[0074] In one embodiment, please refer to Figure 6 , the valve core body 2201 has a core rod mounting hole 22013. The valve core body 2201 includes an annular flange 22014 on the wall of the core rod mounting hole 22013, and the core rod 22021 is located in the core rod mounting hole 22013. In the length direction of the core rod 22021, the elastic seal 2203 and the elastic member 2205 are respectively on both sides of the annular flange 22014. In one embodiment, one end of the spring abuts against the annular flange 22014, and the other end abuts against one end of the core rod 22021.

[0075] In one embodiment, please refer to Figure 6 , when the blowtorch ignites, the path of the gas circuit is as follows: after the operating member 201 operates the inner core 2202 to move to open the valve core passage 2204, the gas in the gas cylinder passes through the gap between the core body adjustment section 22011 and the valve body 210 and the air holes (not marked) on the valve core body 2201 and enters the valve core 220, and then enters the core rod mounting hole 22013 in the valve core body 2201 through the gap between the core rod 22021, the elastic seal 2203 and the annular flange 22014, and then enters the air outlet hole 216. By screwing the valve core body 2201, the valve core body 2201 rotates relative to the valve body 210. Since the valve core body 2201 is threadedly connected to the valve body 210, the valve core body 2201 can move relative to the valve body 210 in the first direction, and then the valve core body 2201 can be inserted into the valve body hole or move out of the valve body hole, so as to achieve the purpose of adjusting the gas flow rate entering the air outlet hole 216.

[0076] In an embodiment of a blowtorch gas valve, the blowtorch gas valve is the gas valve in any of the above embodiments, and details are not described herein again.

[0077] The above uses specific examples to elaborate on the present application, which is only used to help understand the present application and is not intended to limit the present application. For those skilled in the technical field to which the present application belongs, according to the idea of the present application, several simple deductions, deformations or substitutions can also be made.

Claims

1. A blowtorch, characterized in that, It includes a handle and a gun body connected to the handle. A gas valve is provided in the gun body, and the gas valve is used to connect to a gas cylinder. The gas valve includes: A valve body having a gas passage for the combustible gas to flow out; A valve core connected to the valve body, and at least part of the valve core can move to control the opening and closing of the gas passage; the valve core has a closed state and an open state; And an elastic seal. In the closed state, the elastic seal disconnects the gas passage; in the open state, the elastic seal releases the seal to open the gas passage; When the valve core moves relative to the valve body in the open state, the valve core adjusts the gas flow rate in the gas passage by changing the flow area of the gas passage.

2. The blowtorch according to claim 1, characterized in that, At least part of the gas passage is formed between the valve core and the valve body. The valve core can move relative to the valve body to control the opening and closing of the gas passage. The elastic seal is arranged between the valve core and the valve body. In the closed state, the valve core is sealed with the valve body through the elastic seal to disconnect the gas passage; in the open state, the valve core and the valve body are unsealed to open the gas passage.

3. The blowtorch according to claim 2, wherein The valve core includes a sealing section and a flow rate adjusting section. The valve core contacts the elastic seal through the sealing section, and the valve core changes the flow area of the gas passage through the flow rate adjusting section; the flow rate adjusting section is upstream or downstream of the sealing section.

4. The blowtorch according to claim 2, wherein, The valve body includes a zero position adjuster and a base body. The zero position adjuster is adjustably installed on the base body. The valve core adjusts the gas flow rate in the gas passage by changing the gap with the zero position adjuster, and the valve core contacts the zero position adjuster when in the closed position.

5. The blowtorch according to claim 4, characterized in that, The zero position adjuster has an adjuster hole for the valve core to insert; the valve core blocks the adjuster hole when in the closed state; a gap is formed between the valve core and the adjuster hole when the valve core is in the open state, and the flow area of the gas passage is changed by adjusting the size of the gap.

6. The blowtorch according to claim 4, characterized in that, The zero position adjuster is threadedly connected to the base body.

7. The blowtorch according to claim 1, characterized in that, At least part of the gas passage is a valve core passage formed in the valve core. The valve core includes a valve core body, an inner core and an elastic seal. The inner core is movably installed in the valve core body, and the inner core can move relative to the valve core body to control the opening and closing of the valve core passage; When the valve core is in the closed state, the inner core is sealed with the valve core body through the elastic seal to disconnect the valve core passage; when the valve core is in the open state, the inner core and the valve core body are unsealed to open the valve core passage; The valve core body can move relative to the valve body; when the valve core is in the open state, the valve core body can adjust the gas flow rate in the gas passage by changing the flow area of the gas passage.

8. The blowtorch according to any one of claims 1-7, characterized in that, The valve core is threadedly connected to the valve body to make the valve core move relative to the valve body by screwing the valve core.

9. The blowtorch according to claim 7, characterized in that, The spool includes an elastic member for applying an elastic force to the inner core to keep the inner core in a state of disconnecting the spool passage. The blowtorch includes an operating member for moving the inner core to an open state of the spool passage by pressing the inner core.

10. A blowtorch air valve, characterized in that, Comprising: A valve body having a gas passage for the outflow of combustible gas; A spool connected to the valve body, with at least a part of the spool moving to control the opening and closing of the gas passage; the spool has a closed state and an open state; And an elastic seal, in the closed state, the elastic seal disconnects the gas passage; in the open state, the elastic seal releases the seal to open the gas passage; When the spool is in the open state and moves relative to the valve body, the spool adjusts the gas flow rate in the gas passage by changing the flow area of the gas passage.

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