Plug valve and gas stove with same

Abstract

The invention provides a plug valve and a gas stove with the plug valve, and belongs to the technical field of kitchen appliances, the plug valve comprises a valve body, a valve core, a valve rod and a valve cover, and the valve body is provided with a valve body cavity and a gas inlet pipe; the valve element is arranged in the valve body cavity, and the side wall of the valve element is provided with a first firepower adjusting channel used for achieving adjustment from big fire to small fire and a second firepower adjusting channel used for achieving starting of the small fire. The valve rod is connected to the valve element, the valve deck is connected to the valve body, and the valve deck is provided with a guide structure for conducting bidirectional rotation on the valve rod. When the valve element is started in the forward direction, one of the first firepower adjusting channel and the second firepower adjusting channel is communicated with the air inlet pipe, and when the valve element is started in the reverse direction, the other one of the first firepower adjusting channel and the second firepower adjusting channel is communicated with the air inlet pipe. Bidirectional starting can be achieved, big fire can be rapidly achieved, small fire can also be directly started, a user can conveniently rotate the rotary knob once to achieve the desired load fire power, and the cooking experience feeling of the user is improved.

Description

Technical Field

[0001] The invention relates to the technical field of kitchen appliances, and in particular to a plug valve and a gas stove having the same. Background Art

[0002] The gas cock is one of the most important parts in gas appliances, and is usually used to control the opening and closing of the stove, the on and off of the gas, and the adjustment of the firepower. However, in the past, the precise control of the gear position of the valve body was arranged through reverse rotation, and the gear position sequence was generally from high fire to low fire, and it was impossible to rotate directly from high fire to low fire. When some stoves are started, there is only low fire, and the user experience is poor. When low-temperature cooking is required, there is a lack of effective fire control means; on the other hand, affected by the sealing distance of the valve core hole, the more gears, the larger the angle. When achieving 5-gear, 7-gear or even 9-gear cooking, the valve body angle is often 240 degrees or 300 degrees. When the user adjusts the valve body knob to adjust the firepower, it is impossible to achieve the operation of high fire to low fire in one rotation, which affects the user experience. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide a plug valve that optimizes the structure of the valve core and the valve cover so that the plug valve can be started in both directions. It not only has the adjustment function from high fire to low fire, but also can directly start low fire, which is convenient for users to achieve the desired load firepower by turning the knob once, thereby improving the user's cooking experience.

[0004] The second technical problem to be solved by the present invention is to provide a gas stove applied to the plug valve.

[0005] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a plug valve, the plug valve comprising:

[0006] A valve body having a valve body cavity and an air inlet pipe connected to the valve body cavity;

[0007] The valve core is arranged in the valve body cavity, and the side wall of the valve core is provided with a first fire power adjustment channel for adjusting from high fire to low fire and a second fire power adjustment channel for starting with low fire;

[0008] A valve stem, connected to the valve core, and used to drive the valve core to rotate clockwise or counterclockwise;

[0009] A valve cover connected to the valve body, the valve cover being provided with a guide structure for enabling the valve stem to rotate in both directions;

[0010] Among them, when the valve core is started in the forward direction, one of the first firepower adjustment channel and the second firepower adjustment channel is connected to the intake pipe, and when the valve core is started in the reverse direction, the other of the first firepower adjustment channel and the second firepower adjustment channel is connected to the intake pipe.

[0011] According to an embodiment of the present invention, the valve body further includes a first air outlet pipe and a second air outlet pipe, the valve core further includes a valve core cavity, the first fire power adjustment channel is connected with the second fire power adjustment channel through the valve core cavity, and the air outlet end of the second fire power adjustment channel is connected to the air inlet end of the second air outlet pipe;

[0012] Wherein, when the valve core is configured to start in the forward direction, the air inlet pipe is connected to the air inlet end of the first fire power adjustment channel, the first fire power adjustment channel is connected to the second fire power adjustment channel and the second air outlet pipe in sequence through the valve core cavity, and the air outlet end of the first fire power adjustment channel is connected to or disconnected from the first air outlet pipe;

[0013] When the valve core is configured to start in reverse, the first firepower adjustment channel is disconnected from the first air outlet pipe, the air inlet pipe, the second firepower adjustment channel and the second air outlet pipe are connected in sequence, and the air flow rate of the second firepower adjustment channel decreases with the increase of the rotation angle.

[0014] According to an embodiment of the present invention, the first firepower adjustment channel includes:

[0015] A first air inlet hole group is arranged on the side wall of the valve core and can be connected to the air inlet pipe as the valve core rotates;

[0016] A first air outlet group, arranged on the side wall of the valve core, which can be connected to or disconnected from the first air outlet pipe as the valve core rotates;

[0017] Wherein, the first air inlet hole group and the first air outlet hole group are connected to form the first firepower adjustment channel.

[0018] According to one embodiment of the present invention, the first air inlet hole group includes a plurality of first air inlet holes arranged circumferentially along the side wall of the valve core, and the first air outlet hole group includes a plurality of first air outlet holes arranged circumferentially along the side wall of the valve core.

[0019] Among them, the apertures of the multiple first air inlet holes are different, the apertures of the multiple first air outlet holes are different, and the first firepower adjustment channel that can transport different amounts of gas is formed by combining the multiple first air inlet holes and the first air outlet holes.

[0020] According to an embodiment of the present invention, as the positive rotation angle of the valve core increases, the apertures of the outlet ends of the plurality of first air inlet holes and the first air outlet holes all tend to increase first and then decrease.

[0021] According to an embodiment of the present invention, the number of the first air inlet holes is greater than the number of the first air outlet holes, so that when some of the first air inlet holes are connected to the air inlet pipe, the first air outlet hole group is not connected to the first air outlet pipe.

[0022] According to an embodiment of the present invention, the included angle between the first air inlet hole and the first air outlet hole corresponding thereto is equal to the included angle between the air inlet pipe and the first air outlet pipe.

[0023] According to one embodiment of the present invention, at least one of the plurality of first air inlet holes is a blind hole, and the other first air inlet holes are through holes, and an air through hole is respectively provided on the hole wall of each of the blind holes, and each of the blind holes is connected to the through hole closest to it through the air through hole, so that the gas transported by the air inlet pipe enters the interior of the valve core through the air through hole and the through hole connected thereto.

[0024] According to an embodiment of the present invention, there are a plurality of the air holes, and the apertures of the plurality of air holes decrease as the positive rotation angle increases.

[0025] According to an embodiment of the present invention, the second firepower adjustment channel includes:

[0026] A second air inlet hole group, comprising a plurality of second air inlet holes, wherein the plurality of second air inlet holes are arranged circumferentially along the side wall of the valve core, and air inlet ends of the plurality of second air inlet holes can be connected to the air inlet pipes respectively;

[0027] A second air outlet hole is provided on the bottom wall of the valve core and is connected to the plurality of second air inlet holes and the second air outlet pipe;

[0028] Among them, as the reverse rotation angle of the valve core increases, the apertures of the plurality of second air inlet holes gradually become smaller, and the plurality of second air inlet holes and second air outlet holes cooperate to form a second firepower adjustment channel for delivering gas only to the second air outlet pipe.

[0029] According to one embodiment of the present invention, the valve cover includes a valve cover body, and the guide structure includes a first guide block and a second guide block connected to the inner side of the top of the valve cover body, the bottom of the first guide block is inclined toward the top of the second guide block away from the side of the first guide block to form a first guide surface, and the bottom of the second guide block is inclined toward the top of the second guide block away from the side of the first guide block to form a second guide surface, and the first guide surface and the second guide surface can guide the forward and reverse movements of the valve stem.

[0030] According to one embodiment of the present invention, the guide structure is connected to a guide plate on the outer periphery of the valve stem, the top surface of the guide plate can abut against the first guide surface and the second guide surface, and can drive the valve stem to rotate smoothly clockwise or counterclockwise under the action of the first guide surface and the second guide surface.

[0031] According to one embodiment of the present invention, the valve cover further comprises:

[0032] A first limiting block is connected to a side of the valve cover body close to an end point of the first guide block, and a gap is provided between the first limiting block and a top of the valve cover body, for axially limiting the valve stem rotated to degrees;

[0033] The second limiting block is connected to the top of the valve cover body and is used for circumferentially limiting the valve stem.

[0034] According to one embodiment of the present invention, the plug valve further includes a gear assembly, and the gear assembly includes:

[0035] A gear shifter connected to a side of the valve core close to the valve stem;

[0036] A mounting column connected to the top of the valve body and having a mounting hole opened along its axial direction;

[0037] A return spring, one end of which is fixed to the mounting hole, and the other end of which extends toward the direction of the gear shifter; a shift bead, which is fixed to the other end of the return spring, wherein the gear shifter is provided with a plurality of shift slots, and the shift bead can be inserted into or detached from each of the shift slots to achieve switching between different gears.

[0038] According to an embodiment of the present invention, the gear shifter comprises:

[0039] A first gear plate, a plurality of first gear teeth are arranged on the outer periphery of the first gear plate, and two adjacent first gear teeth form a gear slot;

[0040] The second gear plate is connected to the bottom of the first gear plate, and a plurality of second gear teeth are arranged on the outer circumference of the second gear plate, wherein the outer diameter of the first gear plate is greater than the outer diameter of the second gear plate.

[0041] According to an embodiment of the present invention, a longitudinal section of each of the first gear teeth and the second gear teeth gradually decreases from inside to outside.

[0042] According to an embodiment of the present invention, an oil reservoir is formed between the first gear teeth and the second gear teeth.

[0043] According to one embodiment of the present invention, the stopcock valve also includes a limiting structure for limiting the gear positioner, and the limiting structure includes a first limiting component and a second limiting component, wherein the first limiting component is connected to the valve core, and the second limiting component is connected to the valve body, and the first limiting component and the second limiting component cooperate to prevent the gear positioner and the valve core from escaping from the valve body cavity.

[0044] According to one embodiment of the present invention, the first limiting component includes:

[0045] A retaining ring, a retaining ring groove for installing the retaining ring is opened on the outer periphery of the valve core, the retaining ring is inserted into the retaining ring groove and abuts against the top surface of the gear shifter to prevent the gear shifter from moving along the axial direction of the valve core.

[0046] According to one embodiment of the present invention, the second limiting component includes:

[0047] A plurality of mounting blocks are connected to a side of the valve body close to the valve cover, and a U-shaped groove is formed on the inner side of each mounting block;

[0048] A limiting ring is inserted into each of the U-shaped grooves, and a plurality of the U-shaped grooves jointly limit the limiting ring;

[0049] Wherein, the axial projection of the limiting ring overlaps with the axial projection of the gear shifter to prevent the gear shifter from escaping from the valve body cavity.

[0050] The technical solution adopted by the present invention to solve the above second technical problem is: a gas stove, which includes a stopcock as described in any one of the above items.

[0051] Compared with the prior art, the present invention has the following advantages or beneficial effects:

[0052] The stopcock valve of the present invention optimizes the structure of the valve core and the valve cover so that the stopcock valve can be started in both directions. It not only has the adjustment function from high fire to low fire, but also can directly start low fire, eliminating the process of first turning to high fire and then adjusting to low fire. It is convenient for users to achieve the desired load firepower by turning the knob once, thereby improving the user's cooking experience.

[0053] The valve core utilizes an up-and-down staggered air intake structure so that the air intake volume will not increase or decrease suddenly due to changes in the aperture during rotation, thereby increasing the air intake path, slowing down the changing flow rate, achieving a stable air intake flow rate, and achieving stable combustion on the stove.

[0054] The gear shifter utilizes a double-layer wavy structure which can not only increase the feel of each gear and reduce the friction area between the gear shifter and the valve body, but also prevent further overflow of the lubricating oil, thereby achieving the effect of reducing torque and improving the user's gear switching experience.

[0055] By setting double limits on the valve core and the valve body, the shifter and the shift bead thereon can be effectively limited, and the valve core can be prevented from running out during transportation or reverse falling, causing the entire valve to fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0057] Figure 1 is a schematic diagram of a plug valve shown according to an exemplary embodiment.

[0058] Figure 2 is an exploded view of a plug valve shown according to an exemplary embodiment.

[0059] Figure 3 is a cross-sectional view of a plug valve shown according to an exemplary embodiment.

[0060] Figure 4 is a schematic diagram of a valve core according to an exemplary embodiment.

[0061] Figure 5 is a right side view of a valve core shown according to an exemplary embodiment.

[0062] Figure 6 is a front view of a valve core shown according to an exemplary embodiment.

[0063] Figure 7 yes Figure 6 Section view in the AA direction.

[0064] Figure 8 yes Figure 6 Cross-sectional view in the BB direction.

[0065] Fig. 9 is a schematic diagram showing the relative positions of a valve core and a gear position according to an exemplary embodiment.

[0066] Fig.10 FIG. 4 is a schematic diagram showing the connection between a valve cover and a valve stem according to an exemplary embodiment.

[0067] Fig.11 is a perspective view of a valve cover shown according to an exemplary embodiment.

[0068] Fig.12is a schematic diagram of a gear shifter according to an exemplary embodiment.

[0069] Fig.13 is a cross-sectional view of a shifter according to an exemplary embodiment.

[0070] Fig.14 is a perspective view of a gear shifter according to an exemplary embodiment.

[0071] Fig.15 is a schematic diagram showing the connection between a valve body, a valve core and a limiting structure according to an exemplary embodiment.

[0072] Fig.16 is a schematic diagram of a valve body according to an exemplary embodiment.

[0073] Fig.17 is a schematic diagram of the connection of a limiting ring according to an exemplary embodiment. Description of the drawings:

[0075] 1. valve body; 10. valve body cavity; 11. air inlet pipe; 12. first air outlet pipe; 13. second air outlet pipe;

[0076] 2. Valve core; 20. Valve core cavity; 21. First air inlet hole group; 211. First air inlet hole; 212. Air passage hole; 22. Second air inlet hole group; 221. Second air inlet hole; 23. First air outlet hole group; 231. First air outlet hole; 24. Second air outlet hole; 25. Retaining spring groove;

[0077] 3. Valve stem;

[0078] 4. Valve cover; 40. Valve cover body; 41. Guide structure; 411. First guide block; 4111. First guide surface; 412. Second guide block; 4121. Second guide surface; 413. Guide plate; 42. First stop block; 420. Gap; 43. Second stop block;

[0079] 5. Shift assembly; 51. Shifter; 511. First shift plate; 5111. First gear; 5112. Shift slot; 512. Second shift plate; 5112. Second gear; 513. Oil reservoir; 52. Mounting column; 521. Mounting hole;

[0080] 6. Limiting structure; 61. First limiting assembly; 611. Retaining spring; 62. Second limiting assembly; 621. Mounting block; 6211. U-shaped groove; 622. Limiting ring; 6221. Notch;

[0081] 7. Paddle; 8. Micro switch; 9. Pressing piece. DETAILED DESCRIPTION

[0082] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0083] The terms "a", "an", "the", "" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0084] The embodiment of the present invention provides a plug valve, such as Figure 1-16 As shown, the plug valve includes a valve body 1, a valve core 2, a valve stem 3 and a valve cover 4, the valve body 1 has a valve body cavity 10 and an air inlet pipe 11 connected to the valve body cavity 10; the valve core 2 is arranged in the valve body cavity 10, and the side wall of the valve core 2 is provided with a first fire power adjustment channel for adjusting from high fire to low fire and a second fire power adjustment channel for starting with low fire; the valve stem 3 is connected to the valve core 2, and is used to drive the valve core 2 to rotate clockwise or counterclockwise; the valve cover 4 is connected to the valve body 1, and the valve cover 4 is provided with a guide structure 41 for allowing the valve stem 3 to rotate in both directions; wherein, when the valve core 2 is started in the forward direction, one of the first fire power adjustment channel and the second fire power adjustment channel is connected to the air inlet pipe 11, and when the valve core 2 is started in the reverse direction, the other of the first fire power adjustment channel and the second fire power adjustment channel is connected to the air inlet pipe 11. Since the first firepower adjustment channel in this embodiment can realize the adjustment from high fire to low fire, that is, it can realize various gears from low fire to high fire; the second firepower adjustment channel realizes low fire start, that is, the second firepower adjustment channel corresponds to low fire; in this way, when cooking, the user only needs to make a choice, for example, when a low fire is needed, it is only necessary to drive the valve stem 3 to drive the valve core 2 to rotate clockwise for reverse start, which is convenient for the user to directly start the stove with a low fire, eliminating the process of turning to a high fire and then adjusting to a low fire; similarly, if a medium fire or a high fire is needed, it is only necessary to drive the valve stem 3 to drive the valve core 2 to rotate counterclockwise. In addition, in order to adapt to this application, the structure of the valve cover 4 is also optimized. Through the guide structure 41, the valve stem 3 can rotate both clockwise and counterclockwise in the OFF gear, and has a forward and reverse bidirectional start process. It is convenient for users to achieve the desired load firepower by rotating the knob once, which improves the user's cooking experience.

[0085] It should be noted that the positive start in this embodiment refers to the valve core 2 being in the state of Fig. 9 The valve stem 3 rotates counterclockwise to ignite the OFF position indicated in the figure, and the desired gear is selected for cooking after ignition; reverse start means that the valve core 2 rotates from the position indicated in the figure to the OFF position indicated in the figure. Fig. 9 The valve stem 3 rotates clockwise to ignite the OFF position, and after ignition, one of the reverse 1-3 positions is selected for cooking. It should be noted that in this embodiment, the air holes of the valve core 2 correspond to the gear slots 5112 on the gear shifter 51, wherein the gear slots 5112 have one more position than the air holes, namely, the position corresponding to the OFF position. For the convenience of description, the position corresponding to the OFF position is referred to as the 0-degree position of the valve core 2 in this application. Fig. 9 The illustrated situation of 5 forward gears and 3 reverse gears is only for the convenience of description and illustration. The specific number of forward and reverse gears can be set according to different usage needs, and this application does not make any specific restrictions.

[0086] In a preferred embodiment of the present invention, Figure 2-9 The shown plug valve body 1 includes a valve body 1 and also includes a first air outlet pipe 12 and a second air outlet pipe 13, and the valve core 2 also includes a valve core chamber 20, the first fire power adjustment channel is connected to the second fire power adjustment channel through the valve core chamber 20, and the air outlet end of the second fire power adjustment channel is connected to the air inlet end of the second air outlet pipe 13; wherein, when the valve core 2 is configured to start in the forward direction, the air inlet pipe 11 is connected to the air inlet end of the first fire power adjustment channel, and the first fire power adjustment channel is connected to the second fire power adjustment channel and the second air outlet pipe 13 in sequence through the valve core chamber 20, and the air outlet end of the first fire power adjustment channel is connected to or disconnected from the first air outlet pipe 12; when the valve core 2 is configured to start in the reverse direction, the first fire power adjustment channel is disconnected from the first air outlet pipe 12, the air inlet pipe 11, the second fire power adjustment channel and the second air outlet pipe 13 are connected in sequence, and the air flow rate of the second fire power adjustment channel decreases with the increase of the rotation angle. That is to say, in this embodiment, the first fire power adjustment channel passes through the valve core chamber 20 and the second fire power adjustment channel, so that the first fire power adjustment channel and the second fire power adjustment channel can be connected to the second outlet pipe 13. However, the first outlet pipe 12 is only connected to the first fire power adjustment channel, and according to the use needs, in some gears such as low fire, the first fire power adjustment channel and the first outlet pipe 12 are not connected, and the first fire power adjustment channel can only deliver the outlet gas through the second outlet pipe 13.

[0087] If the forward start is at a specific firepower adjustment point, such as a commonly used non-high-fire cooking mode, the airflow of the first firepower adjustment channel can of course be adjusted according to actual needs along with the valve core 2. This assumption is only for the convenience of description and is not used to limit the present application. The specific process is: when the valve core 2 is forward started, the gas in the air inlet pipe 11 enters the first firepower adjustment channel, and the gas in the first firepower adjustment channel enters the first air outlet pipe 12 and the second air outlet pipe 13 at the same time, and then enters the inner and outer ring cavities of the burner head for combustion. The first air outlet pipe 12 and the second air outlet pipe 13 increase as the airflow of the first firepower adjustment channel increases, and decrease as the airflow of the first firepower adjustment channel decreases. When the airflow of the first firepower adjustment channel reaches the preset low-fire state, the first firepower adjustment channel is only connected to the second air outlet pipe 13 to meet the demand of switching from high-fire cooking to low-fire. When the valve core 2 is reversely started, the second fire power adjustment channel directly corresponds to low fire, and the second fire power adjustment channel is only connected to the second air outlet pipe 13, and as the clockwise rotation angle of the valve core 2 increases, the air flow of the second fire power adjustment channel gradually decreases. In this way, the user can directly start the stove ignition by reverse start, and the stove is directly started to low fire, eliminating the process of switching to high fire and then adjusting to low fire, thereby improving the user's cooking experience.

[0088] In a preferred embodiment of the present invention, Figure 2-9 The first fire power adjustment channel shown includes a first air inlet group 21 and a first air outlet group 23. The first air inlet group 21 is arranged on the side wall of the valve core 2 and can be connected to the air inlet pipe 11 as the valve core 2 rotates. The first air outlet group 23 is arranged on the side wall of the valve core 2 and can be connected or disconnected with the first air outlet pipe 12 as the valve core 2 rotates. The first air inlet group 21 and the first air outlet group 23 are connected to form the first fire power adjustment channel. In this embodiment, the first air inlet group 21 and the first air outlet group 23 are connected to form various gears from low fire to medium fire. When the air intake of the first air inlet group 21 is small and belongs to low fire, all the gas can be transported to the second air outlet pipe 13 and enter the inner ring of the burner. That is, even in the forward start process, the first fire power adjustment channel can also realize low fire cooking through the first air inlet group 21, that is, the cooking requirements of high fire first and then low fire can be met in the minimum rotation angle range during the cooking process, thereby improving the user experience.

[0089] In a preferred embodiment of the present invention, Figure 2-9 The first air inlet hole group 21 shown includes a plurality of first air inlet holes 211 arranged circumferentially along the side wall of the valve core 2, and the first air outlet hole group 23 includes a plurality of first air outlet holes 231 arranged circumferentially along the side wall of the valve core 2, wherein the apertures of the plurality of first air inlet holes 211 are different, and the apertures of the plurality of first air outlet holes 231 are different, and a first fire power adjustment channel capable of conveying different gas amounts is formed by combining the plurality of first air inlet holes 211 and the first air outlet holes 231. Figure 2-9As shown, the aperture variation rule of the plurality of first air outlet holes 231 is the same as the aperture variation rule of the plurality of first air inlet holes 211. For example, when the first air inlet holes 211 rotate to the high-fire position, the aperture of the first air outlet holes 231 is also the largest, ensuring the maximum firepower. The precise control of the firepower is achieved through the cooperation of the two.

[0090] In a preferred embodiment of the present invention, Figure 2-9 As shown in the figure, as the positive rotation angle of the valve core 2 increases, the apertures of the outlet ends of the plurality of first air inlet holes 211 and the first air outlet holes 231 all increase first and then decrease. The positive rotation angle of this embodiment refers to the angle of rotation of the valve core 2 from the 0 degree position to the corresponding positive gear position. In this embodiment, the aperture of the first air inlet hole 211 increases first and then decreases, and the firepower of the plug valve also increases first and then decreases. Figure 2-9 The five-speed forward firepower precision control is illustrated. Forward 1-4 speeds are all for the first outlet pipe 12 and the second outlet pipe 13 to exhaust, that is, the inner and outer rings to exhaust. Forward 5 speed only has the second outlet pipe 13, that is, the inner ring to exhaust. Among them, forward 1 speed is a specific firepower adjustment point that is not the maximum fire, and is usually set to a commonly used non-high-fire cooking mode. This design can match the medium-temperature cooking mode by setting the aperture size; forward 2 speed is the maximum load position, that is, the commonly used stir-fry mode; forward 3 speed has a double-ring firepower reduction relative to forward 2 speed, realizing firepower reduction control; forward 4 speed has a double-ring firepower reduction relative to forward 3 speed, realizing firepower reduction control; forward 5 speed only has the inner ring to exhaust, with the minimum firepower load; this design satisfies the user to switch to a low fire after cooking with a high fire to avoid the problem of excessive angle rotation, thereby improving the user's cooking experience. Of course, the number of forward gears can also be 3, 4, 5, 6, 7, 8, 9, 10 or even more, which can be designed according to user needs, and this application is not limited here.

[0091] Preferably, multiple first air inlet holes 211 are staggered up and down on the valve core 2, that is, the central axes of two adjacent first air inlet holes 211 are arranged up and down. In this way, when the gear is changed and the air inlet aperture becomes smaller or larger, the air inlet path is increased, the changing flow rate is slowed down, the stable air inlet flow rate is achieved, and stable combustion is achieved on the stove.

[0092] In a preferred embodiment of the present invention, Figure 2-9The number of the first air inlet holes 211 shown is greater than the number of the first air outlet holes 231, so that when some of the first air inlet holes 211 are connected to the air inlet pipe 11, the first air outlet hole group 23 is not connected to the first air outlet pipe 12. Since the firepower of the first firepower adjustment channel increases first and then decreases, when its firepower is low, only the inner ring corresponding to the second air outlet pipe 13 needs to be fired, so the first air outlet pipe 12 needs to be disconnected at this time. Therefore, the number of the first air outlet holes 231 is less than the number of the first air inlet holes 211, and the first firepower adjustment channel is connected to the second firepower adjustment channel through the valve core cavity 20, which can meet the above requirements. The structure is ingenious and reasonable, and the gear shift is convenient.

[0093] In a preferred embodiment of the present invention, Figure 2-9 The angle between the first air inlet 211 and the corresponding first air outlet 231 is equal to the angle between the air inlet pipe 11 and the first air outlet 12. In this embodiment, the first air inlet 211 and the corresponding first air outlet 231 mean that when the first air inlet 211 is connected to the air inlet pipe 11, the gas can be output from the corresponding first air outlet 231 and enter the first air outlet 12. Figure 8-9 The first air inlet 211 near the valve core at 20 degrees is the first air inlet 211 corresponding to the first gear in the forward direction, and the corresponding first air outlet 231 is the first air outlet 231 closest to the valve core at 20 degrees. By making the angle between the first air inlet 211 and the first air outlet 231 corresponding thereto equal to the angle between the air inlet pipe 11 and the first air outlet pipe 12. In this embodiment, the angle between the first air inlet 211 and the first air outlet 231 corresponding thereto is designed to be 90°, and the valve core 2 is processed and formed. By matching the angle and aperture of the first air inlet 211 and the first air outlet 231 corresponding thereto, accurate control of firepower is ensured.

[0094] In a preferred embodiment of the present invention, Figure 2-9 At least one of the multiple first air inlet holes 211 is a blind hole, and the other first air inlet holes 211 are through holes. Each blind hole has a through hole 212 formed on its wall. Each blind hole is connected to the through hole closest to it through the through hole 212, so that the gas transported by the air inlet pipe 11 enters the interior of the valve core 2 through the air hole 212 and the through hole connected thereto. Figure 8-9 In the forward 2nd gear high fire position, as the valve core 2 continues to rotate, the aperture of the first air inlet 211 continues to decrease, and the aperture will continue to decrease. Since there will be an instantaneous change in firepower between gears, part of the first air inlet 211 can be designed as a blind hole, and the air hole 212 can be used to ensure that the air intake volume is gradually reduced during the gear switching process, so as to ensure a smooth switching process and prevent instantaneous firepower changes due to the interval between gears. For example, Figure 2-9It illustrates a situation that the forward 1st gear, the forward 2nd gear and the forward 3rd gear are all through holes and the corresponding apertures increase first and then decrease, the forward 4th gear and the forward 5th gear are blind holes, and there is an air hole 212 between the forward 4th gear and the forward 5th gear for gear switching, and the forward 4th gear and the forward 3rd gear are designed with air holes 212. When the forward 3rd gear is switched to the forward 4th gear, the firepower needs to be gradually reduced. If there is no air hole 212, since the interval section between the forward 4th gear and the forward 3rd gear cannot take in air, the airflow will first become very small, then become larger, and then to a small process, and the firepower will also have an instantaneous firepower change, affecting the user experience. The air hole 212 can realize the conversion of the aperture size between the gears, and realize the smooth conversion of the firepower size.

[0095] In a preferred embodiment of the present invention, Figure 2-9 There are multiple air holes 212 shown, and the apertures of the multiple air holes 212 decrease as the rotation angle increases. For some applications where the gear position needs to be precisely controlled within a small range, when the aperture of the first air inlet 211 decreases, it is necessary to design multiple blind holes and air holes 212, such as the attached Figure 2-9 It illustrates a situation in which the forward 1st gear, the forward 2nd gear and the forward 3rd gear are all through holes and the corresponding apertures increase first and then decrease, while the forward 4th gear and the positive 5th gear are blind holes. As the firepower gradually decreases, the aperture of the air hole 212 also gradually becomes smaller, realizing the switching of the firepower reduction from the forward 4th gear to the positive 5th gear.

[0096] Preferably, the central axis of two adjacent air holes 212 are collinear, and the outlet of each air hole partially overlaps with the inlet of the adjacent air hole, that is, there is a certain misalignment between the two adjacent air holes to prevent the air flow from suddenly increasing or decreasing. The certain misalignment between the two is used to buffer the air flow change.

[0097] In a preferred embodiment of the present invention, Figure 2-9 The second fire power adjustment channel shown includes a second air inlet hole group 22 and a second air outlet hole 24. The second air inlet hole group 22 includes a plurality of second air inlet holes 221. The plurality of second air inlet holes 221 are arranged circumferentially along the side wall of the valve core 2. The air inlet ends of the plurality of second air inlet holes 221 can be connected to the air inlet pipe 11 respectively. The second air outlet hole 24 is arranged on the bottom wall of the valve core 2. The second air outlet hole 24 is connected between the plurality of second air inlet holes 221 and the second air outlet pipe 13. As the reverse rotation angle of the valve core 2 increases, the apertures of the plurality of second air inlet holes 221 gradually decrease. The plurality of second air inlet holes 221 and the second air outlet hole 24 cooperate to form a second fire power adjustment channel for delivering gas only to the second air outlet pipe 13. In the present application, the plurality of second air inlet holes 221 all correspond to small fires, and the fire power decreases as the reverse rotation angle increases. That is, reverse start only sets the firepower to low fire. Users can directly start low fire by reverse start, eliminating the process of switching to high fire and then adjusting to low fire, thus improving the user's cooking experience. Fig. 9 The diagram shows the reverse 3rd gear situation. Of course, there can be other gears such as 2, 4, 5, 6, 7, 8 or even more. It only needs to be adjusted according to design requirements. This application does not limit this.

[0098] Preferably, multiple second air inlet holes 221 are staggered up and down on the valve core 2, that is, the central axes of two adjacent second air inlet holes 221 are arranged up and down. In this way, when the gear is changed and the air inlet aperture becomes smaller or larger, the air inlet path is increased, the changing flow rate is slowed down, the stable air inlet flow rate is achieved, and stable combustion is achieved on the stove.

[0099] In a preferred embodiment of the present invention, Figure 10-11 The valve cover 4 shown includes a valve cover body 40, and the guide structure 41 includes a first guide block 411 and a second guide block 412 connected to the inner side of the top of the valve cover body 40. The bottom of the first guide block 411 is away from the side of the second guide block 412 and is inclined toward the top thereof to form a first guide surface 4111, and the bottom of the second guide block 412 is away from the side of the first guide block 411 and is inclined toward the top thereof to form a second guide surface 4121. The first guide surface 4111 and the second guide surface 4121 can guide the forward and reverse movements of the valve stem 3. The present application limits the 0 degree position of the valve stem 3 by setting the first guide block 411 and the second guide block 412 of the valve cover 4, and the first guide surface 4111 and the second guide surface 4121 can guide the forward start and reverse start processes, that is, when igniting, the user can choose forward start, that is, to rotate the valve stem 3 counterclockwise for ignition, or can choose reverse start, that is, to rotate the valve stem 3 clockwise for ignition, so as to meet the two-way start of the valve stem 3, and facilitate the user to achieve the desired load firepower by rotating the knob once. for example Fig. 9 There are five forward gears and three reverse gears as shown. The user only needs to rotate the valve stem 3 to the corresponding gear position. The operation is simple and convenient, which improves the user experience.

[0100] In a preferred embodiment of the present invention, Figure 10-11 The guide structure 41 shown is connected to the guide plate 413 on the periphery of the valve stem 3. The top surface of the guide plate 413 can abut against the first guide surface 4111 and the second guide surface 4121, and can drive the valve stem 3 to rotate smoothly clockwise or counterclockwise under the action of the first guide surface 4111 and the second guide surface 4121. The guide plate 413 in this embodiment includes an annular section sleeved on the periphery of the valve stem 3 and a straight section for contacting the first guide surface 4111 and the second guide surface 4121. When the stove is ignited, the valve stem 3 is pressed down and rotated to achieve ignition, and the guide plate 413 moves downward and rotates with the valve stem 3, wherein the first guide surface 4111 or the second guide surface 4121 leaves the 0 degree limit after the knob is pressed down, giving the guide plate 413 and the valve stem 3 a smooth transition.

[0101] In a preferred embodiment of the present invention, Figure 10-11 The valve cover 4 shown also includes a first limit block 42 and a second limit block 43. The first limit block 42 is connected to the side of the valve cover body 40 close to the end point of the first guide block 411, and there is a gap 420 between the first limit block 42 and the top of the valve cover body 40, which is used to axially limit the valve stem 3 rotated to 90 degrees; the second limit block 43 is connected to the top of the valve cover body 40, which is used to circumferentially limit the valve stem 3. The first limit block 42 can be a 90-degree limit, and the second limit block 43 can be a 180-degree limit. The gap 420 designed on the valve cover 4 has a depth within the range of ±1mm in the downward stroke, and usually according to the downward stroke of 3.5mm, the depth of the gap 420 is between 2.5mm-4.5mm. The function of the gap 420 is that when the stopcock is rotated to the 90-degree limit, when it continues to rotate downward, it will not be unable to press down due to the limit in the valve cover 4, and it can continue to press down to start the stir-frying, thereby ensuring the user's pressing down stir-frying experience. The second limit block 43 and the first guide surface 4111 form a rotation range for the forward rotation of the valve stem 3, and the second limit block 43 and the second guide surface 4121 form a rotation range for the reverse rotation of the valve stem 3. The limit step in the prior art is eliminated, the swing of the pressing plate 9 is reduced, and the problem of fluctuation of the pressing plate 9 when rotating from the high-fire position to the low-fire position, or from the low-fire position to the high-fire position, is avoided.

[0102] In a preferred embodiment of the present invention, Figure 2 , 3 The plug valve shown in 12-14 also includes a gear assembly 5, which includes a gear 51, a mounting column 52, a reset spring and a gear bead. The gear 51 is connected to the side of the valve core 2 close to the valve stem 3; the mounting column 52 is connected to the top of the valve body 1, and a mounting hole 521 is opened in the axial direction; one end of the reset spring is fixed to the mounting hole 521, and the other end of the reset spring extends in the direction of the gear 51; the gear bead 54 is fixed to the other end of the reset spring 53, wherein the gear 51 is opened with a plurality of gear slots 5112, and the gear bead 54 can be inserted into or out of each gear slot 5112 to achieve the switching of different gears. The gear 51, the gear bead and the reset spring cooperate with each other, and each fire power gear has a hand feel feedback, which is convenient for users to understand the fire power size in time and convenient for operation to adjust the fire power.

[0103] In a preferred embodiment of the present invention, Figure 2 , 3, 12-14, the gear shifter 51 comprises a first gear plate 511 and a second gear plate 512. The outer periphery of the first gear plate 511 is provided with a plurality of first gear teeth 5111, and two adjacent first gear teeth 5111 form a gear slot 5112. The second gear plate 512 is connected to the bottom of the first gear plate 511, and the outer periphery thereof is provided with a plurality of second gear teeth 5112, wherein the outer diameter of the first gear plate 511 is greater than the outer diameter of the second gear plate 512. Figure 12-14 It is not difficult to see that the first gear plate 511 and the second gear plate 512 are stepped as a whole. This design can reduce the friction area between the outer periphery of the gear device 51 and the gear bead, and reduce the rotational torque of the valve core 2.

[0104] In a preferred embodiment of the present invention, Figure 12-14 The longitudinal section of each first gear tooth 5111 and second gear tooth 5112 shown in the figure gradually decreases from the inside to the outside. That is, the top surface and the bottom surface of the first gear tooth 5111 are both provided with inclined surfaces with a certain slope, which effectively reduces the friction area between the first gear tooth 5111 and the valve body 1 and reduces the rotation torque of the valve core 2. The bottom surface of the second gear tooth 5112 is provided with an inclined surface with a certain slope, which reduces the friction between the gear shifter 51 and the valve core 2, thereby achieving the purpose of reducing the rotation torque of the valve body 1.

[0105] In a preferred embodiment of the present invention, Figure 12-14 An oil storage groove 513 is formed between the first gear teeth 5111 and the second gear teeth 5112. Generally, the valve core 2 is ground with lubricating oil. If too much lubricating oil overflows, the torque between the valve core 2 and the valve body 1 will increase. The oil storage groove 513 can provide an additional storage space for the valve body 1 to avoid the lubricating oil from overflowing and ensure a smaller rotation torque.

[0106] In a preferred embodiment of the present invention, Figure 15-17 The plug valve shown also includes a limiting structure 6 for limiting the position of the gear 51. The limiting structure 6 includes a first limiting component 61 and a second limiting component 62. The first limiting component 61 is connected to the valve core 2, and the second limiting component 62 is connected to the valve body 1. The first limiting component 61 and the second limiting component 62 cooperate to prevent the gear 51 and the valve core 2 from escaping from the valve body cavity 10. In this example, a double limiting structure is provided at the valve core 2 and the valve body 1 to limit the gear 51 and the gear bead from running out, and also to limit the transportation process. When the valve body 1 falls in the opposite direction, the valve core 2 runs out, causing the valve as a whole to fail, affecting the use of the user.

[0107] In a preferred embodiment of the present invention, Fig.15The first limit assembly 61 shown includes a retaining spring 611. A retaining spring groove 25 for installing the retaining spring 611 is provided on the outer periphery of the valve core 2. The retaining spring 611 is inserted into the retaining spring groove 25 and abuts against the top surface of the gear 51 to prevent the gear 51 from moving in the axial direction of the valve core 2. The retaining spring 611 is also called a retaining ring or a buckle ring. By assembling it in the retaining spring groove 25 on the outer periphery of the valve core 2, the gear 51 can be prevented from moving in the axial direction, thereby preventing the gear 51 and the gear bead from running out and the gear from failing.

[0108] In a preferred embodiment of the present invention, Fig.16 , 17 The second limiting assembly 62 shown includes a plurality of mounting blocks 621 and a limiting ring 622. The plurality of mounting blocks 621 are connected to the side of the valve body 1 close to the valve cover 4. A U-shaped groove 6211 is provided on the inner side of each mounting block 621. The limiting ring 622 is inserted into each U-shaped groove 6211. The plurality of U-shaped grooves 6211 jointly limit the limiting ring 622. The axial projection of the limiting ring 622 overlaps with the axial projection of the gear 51 to prevent the gear 51 from escaping from the valve body cavity 10. The limiting ring 622 is located above the gear 51, and the axial projections of the two overlap, which can prevent the valve core 2 from running out during transportation and reverse falling, making the overall plug valve ineffective.

[0109] Preferably, a notch 6221 is provided on the limiting ring 622 to facilitate its insertion into the plurality of U-shaped grooves 6211 .

[0110] An embodiment of the present invention provides a gas stove, the gas stove comprising: Figure 1-17The above-mentioned stopcock valve shown. Because the gas stove includes any of the above-mentioned stopcock valves, the gas stove of this embodiment also has the above-mentioned technical effects. That is to say, when the user starts the stove to ignite, he can rotate the knob forward, that is, the existing counterclockwise rotation knob, to adjust the firepower to the required firepower, such as high fire, medium fire, etc., or he can directly start it in the reverse direction, that is, rotate the knob clockwise, so that the user can start the stove directly with a low fire, eliminating the process of turning to high fire and then adjusting to low fire, thereby improving the user's cooking experience. In addition, the first air inlet hole group 21 and the second air inlet hole group 22 on the valve core 2 use an upper and lower staggered air intake structure, so that the valve core 2 will not cause a sudden increase or decrease in the air intake amount due to the change in the aperture during the rotation process, increase the air intake path, slow down the changing flow rate, achieve a stable air intake flow rate, and achieve stable combustion on the stove. The gear shifter 51 can not only increase the feel of each gear, reduce the friction area between the gear shifter 51 and the valve body 1, and prevent further spillage of lubricating oil, which will increase the rotation resistance and torque when too much lubricating oil spills, but also improve the user's gear switching experience. By setting a double limit on the valve core 2 and the valve body 1, the gear shifter 51 and the gear bead thereon can be effectively limited, and the valve core 2 can be prevented from running out during transportation or reverse falling, causing the entire valve to fail.

[0111] In addition, a micro switch 8 is set at the high fire position of the valve body at 190 degrees to detect whether the stove fire is in the stir-fry position. If the paddle 7 installed on the top of the valve core 2 rotates to the stir-fry position with the valve core 2, the raised part of the paddle 7 presses against the sensing part of the micro switch 8, so that the micro switch 8 is closed and transmits the signal to the controller, and the controller controls the range hood to start the stir-fry air volume; if it is in other non-stir-fry positions, the paddle 7 does not contact the micro switch 8, the micro switch 8 is in the open state, and the controller controls the range hood to reduce the air volume according to the gear position of the valve core 2. This solution is simple and intelligent, and there is no need to set up additional electronic control. The controller only needs to realize the linkage air volume size control according to the opening and closing circuit current of the micro switch to realize the linkage large and small air volume control.

[0112] In the embodiments of the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installation", "connection", "fixation" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0113] In the description of the embodiments of the present invention, it needs to be understood that the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the embodiments of the present invention.

[0114] In the description of this specification, the description of the terms "one embodiment", "a preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0115] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plug valve, characterized in that: include: A valve body (1) having a valve body cavity (10) and an air inlet pipe (11) connected to the valve body cavity (10); The valve core (2) is arranged in the valve body cavity (10), and its side wall is provided with a first fire power adjustment channel for adjusting from high fire to low fire and a second fire power adjustment channel for starting with low fire; A valve stem (3) connected to the valve core (2) and used to drive the valve core (2) to rotate clockwise or counterclockwise; A valve cover (4) connected to the valve body (1), the valve cover (4) being provided with a guide structure (41) for enabling the valve stem (3) to rotate in both directions; When the valve core (2) is started in the forward direction, one of the first fire power adjustment channel and the second fire power adjustment channel is connected to the air intake pipe (11); when the valve core (2) is started in the reverse direction, the other of the first fire power adjustment channel and the second fire power adjustment channel is connected to the air intake pipe (11).

2. The plug valve according to claim 1, characterized in that: The valve body (1) further comprises a first air outlet pipe (12) and a second air outlet pipe (13); the valve core (2) further comprises a valve core cavity (20); the first fire power adjustment channel is connected to the second fire power adjustment channel through the valve core cavity (20); and the air outlet end of the second fire power adjustment channel is connected to the air inlet end of the second air outlet pipe (13); Wherein, when the valve core (2) is configured to start in the forward direction, the air inlet pipe (11) is connected to the air inlet end of the first fire power adjustment channel, the first fire power adjustment channel is connected to the second fire power adjustment channel and the second air outlet pipe (13) in sequence through the valve core cavity (20), and the air outlet end of the first fire power adjustment channel is connected to or disconnected from the first air outlet pipe (12); When the valve core (2) is configured to start in reverse, the first firepower adjustment channel is disconnected from the first air outlet pipe (12), the air inlet pipe (11), the second firepower adjustment channel and the second air outlet pipe (13) are connected in sequence, and the air flow rate of the second firepower adjustment channel decreases as the rotation angle increases.

3. The plug valve according to claim 2, characterized in that: The first firepower adjustment channel includes: A first air inlet hole group (21) is arranged on the side wall of the valve core (2) and can be connected to the air inlet pipe (11) as the valve core (2) rotates; A first air outlet hole group (23) is arranged on the side wall of the valve core (2), and can be connected to or disconnected from the first air outlet pipe (12) as the valve core (2) rotates; Wherein, the first air inlet hole group (21) and the first air outlet hole group (23) are connected to form the first firepower adjustment channel.

4. The plug valve according to claim 3, characterized in that: The first air inlet hole group (21) comprises a plurality of first air inlet holes (211) arranged circumferentially along the side wall of the valve core (2); the first air outlet hole group (23) comprises a plurality of first air outlet holes (231) arranged circumferentially along the side wall of the valve core (2); The apertures of the plurality of first air inlet holes (211) are all different, and the apertures of the plurality of first air outlet holes (231) are different. The first firepower adjustment channel capable of conveying different amounts of gas is formed by combining the plurality of first air inlet holes (211) and the first air outlet holes (231).

5. The plug valve according to claim 4, characterized in that: As the positive rotation angle of the valve core (2) increases, the apertures of the gas outlet ends of the plurality of first gas inlet holes (211) and the first gas outlet holes (231) tend to first increase and then decrease.

6. The plug valve according to claim 4, characterized in that: The number of the first air inlet holes (211) is greater than the number of the first air outlet holes (231), so that when some of the first air inlet holes (211) are connected to the air inlet pipe (11), the first air outlet hole group (23) is not connected to the first air outlet pipe (12).

7. The plug valve according to claim 4, characterized in that: The included angle between the first air inlet hole (211) and the first air outlet hole (231) corresponding thereto is equal to the included angle between the air inlet pipe (11) and the first air outlet pipe (12).

8. The plug valve according to claim 4, characterized in that: At least one of the plurality of first air inlet holes (211) is a blind hole, and the remaining first air inlet holes (211) are through holes. A through hole (212) is respectively provided on the wall of each blind hole, and each blind hole is connected to the through hole closest to it through the through hole (212), so that the gas transported by the air inlet pipe (11) enters the interior of the valve core (2) through the through hole (212) and the through hole connected thereto.

9. The plug valve according to claim 8, characterized in that: There are a plurality of air holes (212), and the apertures of the plurality of air holes (212) decrease as the forward rotation angle increases.

10. The plug valve according to claim 2, characterized in that: The second firepower adjustment channel includes: A second air inlet hole group (22), comprising a plurality of second air inlet holes (221), wherein the plurality of second air inlet holes (221) are arranged circumferentially along the side wall of the valve core (2), and the air inlet ends of the plurality of second air inlet holes (221) can be respectively connected to the air inlet pipes (11); A second air outlet hole (24) is arranged on the bottom wall of the valve core (2) and is connected to the plurality of second air inlet holes (221) and the second air outlet pipe (13); As the reverse rotation angle of the valve core (2) increases, the apertures of the plurality of second air inlet holes (221) gradually decrease, and the plurality of second air inlet holes (221) cooperate with the second air outlet holes (24) to form a second firepower adjustment channel for delivering gas only to the second air outlet pipe (13).

11. The plug valve according to claim 1, characterized in that: The valve cover (4) includes a valve cover body (40), and the guide structure (41) includes a first guide block (411) and a second guide block (412) connected to the inner side of the top of the valve cover body (40), the bottom of the first guide block (411) is away from the side of the second guide block (412) and is inclined toward the top thereof to form a first guide surface (4111), and the bottom of the second guide block (412) is away from the side of the first guide block (411) and is inclined toward the top thereof to form a second guide surface (4121), and the first guide surface (4111) and the second guide surface (4121) can guide the forward and reverse movements of the valve stem (3).

12. The plug valve according to claim 11, characterized in that The guide structure (41) is connected to a guide plate (413) on the outer periphery of the valve stem (3); the top surface of the guide plate (413) can abut against the first guide surface (4111) and the second guide surface (4121), and can drive the valve stem (3) to rotate smoothly clockwise or counterclockwise under the action of the first guide surface (4111) and the second guide surface (4121).

13. The plug valve according to claim 11, characterized in that The valve cover (4) further comprises: A first limiting block (42) is connected to a side of the valve cover body (40) close to an end point of the first guide block (411), and a gap (420) is provided between the first limiting block (42) and the top of the valve cover body (40) for axially limiting the valve stem (3) rotated to 90 degrees; The second limiting block (43) is connected to the top of the valve cover body (40) and is used to limit the valve stem (3) in a circumferential direction.

14. The plug valve according to claim 1, characterized in that It also includes a gear assembly (5), wherein the gear assembly (5) includes: A gear shifter (51), connected to a side of the valve core (2) close to the valve stem (3); A mounting column (52) connected to the top of the valve body (1) and having a mounting hole (521) opened along its axial direction; A return spring, one end of which is fixed to the mounting hole (521) and the other end of which extends in the direction of the gear shifter (51); The gear bead is fixedly connected to the other end of the return spring, wherein the gear device (51) is provided with a plurality of gear slots (5112), and the gear bead can be inserted into or removed from each gear slot (5112) to achieve switching of different gears.

15. The plug valve according to claim 14, characterized in that The gear shifter (51) comprises: A first gear plate (511), the outer circumference of which is provided with a plurality of first gear teeth (5111), and two adjacent first gear teeth (5111) form a gear slot (5112); The second gear plate (512) is connected to the bottom of the first gear plate (511), and a plurality of second gear teeth (5112) are arranged on its outer circumference, wherein the outer diameter of the first gear plate (511) is greater than the outer diameter of the second gear plate (512).

16. The plug valve according to claim 15, characterized in that The longitudinal cross-section of each of the first gear teeth (5111) and the second gear teeth (5112) gradually decreases from the inside to the outside.

17. The plug valve according to claim 15, characterized in that An oil storage groove (513) is formed between the plurality of first gear teeth (5111) and the second gear teeth (5112).

18. The plug valve according to claim 14, characterized in that It also includes a limiting structure (6) for limiting the position of the gear shifter (51), wherein the limiting structure (6) includes a first limiting component (61) and a second limiting component (62), wherein the first limiting component (61) is connected to the valve core (2), and the second limiting component (62) is connected to the valve body (1), and the first limiting component (61) and the second limiting component (62) cooperate to prevent the gear shifter (51) and the valve core (2) from escaping from the valve body cavity (10).

19. The plug valve according to claim 18, characterized in that The first limiting component (61) comprises: A retaining spring (611) is provided on the outer periphery of the valve core (2) with a retaining spring groove (25) for installing the retaining spring (611). The retaining spring (611) is inserted into the retaining spring groove (25) and abuts against the top surface of the gear shifter (51) to prevent the gear shifter (51) from moving along the axial direction of the valve core (2).

20. The plug valve according to claim 18, characterized in that The second limiting component (62) comprises: A plurality of mounting blocks (621) connected to a side of the valve body (1) close to the valve cover (4), wherein a U-shaped groove (6211) is provided on the inner side of each mounting block (621); A limiting ring (622) is inserted into each of the U-shaped grooves (6211), and the plurality of U-shaped grooves (6211) jointly limit the limiting ring (622); The axial projection of the limiting ring (622) overlaps with the axial projection of the gear shifter (51) to prevent the gear shifter (51) from falling out of the valve body cavity (10).

21. A gas stove, characterized in that: Comprising a plug valve as described in any one of claims 1-20.

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