Plug valve for gas oven

Abstract

The utility model relates to a plug valve for a gas oven. The plug valve comprises a valve body provided with a gas inlet channel, a main gas outlet channel and a gas entraining channel. A ventilation cavity is formed in the lower portion of the valve element, and the air outlet channel is communicated with the ventilation cavity; a valve rod is arranged on the valve cover in a penetrating manner; the burner is characterized in that an ignition hole, a big fire hole, a small fire hole and a strong fire hole are formed in the side wall of the ventilation cavity, the hole diameter of the big fire hole is larger than that of the small fire hole, and the hole diameter of the strong fire hole is larger than that of the big fire hole; an auxiliary barrier groove communicated with the ignition hole, a big fire barrier groove communicated with the big fire hole and a small fire barrier groove communicated with the small fire hole are further formed in the outer side wall of the ventilation cavity; the rotation of the valve core can determine whether the big fire hole, the small fire hole and the strong fire hole are communicated with the air inlet channel or not, and can also determine whether the ignition hole is communicated with the air entraining channel or not. When high fire is needed for barbecuing, the valve element rotates to the position where the high fire hole is communicated with the air inlet channel, at the moment, the air outlet amount is maximum, and high fire roasting is conducted.

Description

Technical Field

[0001] The utility model relates to a plug valve for a gas oven with more fire levels. Background Art

[0002] The gas valve in various gas appliances is a manually operated valve for controlling the gas supply. It generally includes a valve body with an air inlet channel and an air outlet channel. A rotatable valve core is arranged in the valve body. A spring chamber is provided on the upper part of the valve core, and a ventilation chamber is provided on the lower part of the valve core. A valve stem that can drive the valve core to rotate is passed through the valve body. A spring is held on the lower end of the valve stem to keep the valve stem moving upward and detaching from the connection with the valve core. The spring is located in the spring chamber on the valve core. A large fire hole and a small fire hole are provided on the side wall of the ventilation chamber of the valve core to connect the air inlet channel and the air outlet channel. Due to the particularity of the gas oven valve, a ignition tube is also required for ignition. For example, a Chinese utility model patent with patent number ZL201920385596.X (publication number CN210014087U) "A gas valve for a gas oven" discloses such a structure, including a valve body, a main air outlet pipe arranged on the valve body, an ignition air outlet pipe connected to the valve body, a nozzle arranged at the air outlet end of the ignition air outlet pipe, a ignition tube and an ignition needle fixed on the ignition tube, an ignition hole is provided at the air outlet end of the ignition tube, and the ignition needle is fixed on the ignition tube; the air inlet end of the ignition tube is connected to the ignition air outlet pipe.

[0003] However, the valve core in the existing gas oven plug valve has only two fire holes, that is, it can only switch the fire gear between high fire and minimum fire. In actual use, such as grilling steak, a strong fire (even stronger than high fire) is required to quickly heat the steak, and the existing gas oven plug valve is not suitable for this purpose. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a plug valve for a gas oven with a reasonable structural design and three gears of low fire, high fire and fierce fire in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: a plug valve for a gas oven, comprising a valve body with an air inlet channel, a main air outlet channel and an air guide channel; a rotatable valve core arranged in the valve body, a ventilation cavity with an opening facing downwards arranged at the lower part of the valve core, the air outlet channel being arranged below the valve core and directly connected to the ventilation cavity; a valve cover fixed at the end of the valve body, a valve stem for driving the valve core to rotate and move up and down being penetrated on the valve cover, the valve stem maintaining an upward movement tendency under the action of a first spring; the valve cover is characterized in that The side wall of the ventilation cavity is provided with an ignition hole, a large fire hole, a small fire hole and a fierce fire hole connected with the ventilation cavity, the aperture of the large fire hole is larger than the aperture of the small fire hole, the aperture of the fierce fire hole is larger than the aperture of the large fire hole, and the outer side wall of the ventilation cavity is also provided with an auxiliary barrier groove connected with the ignition hole, a large fire barrier groove connected with the large fire hole and a small fire barrier groove connected with the small fire hole; the rotation of the valve core can determine whether the large fire hole, the small fire hole and the fierce fire hole are connected with the air intake channel, and can also determine whether the ignition hole is connected with the air inlet channel.

[0006] As a specific fire control method of the valve core, when the valve core is at the 0-degree position, the air intake channel is blocked from the large fire hole, the small fire hole and the fierce fire hole, and the air inlet channel is connected to the ignition hole; when the valve core rotates from the 0-degree position to the first angle position, the air intake channel is connected to the large fire hole; when the valve core rotates from the first angle position to the second angle position, the air intake channel is connected to the small fire hole; when the valve core rotates from the second angle position to the third angle position, the air intake channel is connected to the fierce fire hole. First is the high fire position, then the low fire position, and finally the fierce fire position, because conventional use only switches between low fire and high fire, and the fierce fire gear is rarely used, so the above design is more reasonable. Of course, other sequential methods are also possible.

[0007] In order to limit the rotation angle of the valve core, it also includes an upper limit disk mounted on the valve stem and capable of rotating synchronously with the valve stem and moving up and down therewith, the peripheral wall of the upper limit disk having an upper stop portion extending outward, and the upper surface of the upper limit disk having an upwardly protruding limit block; a lower limit disk mounted on the valve core and capable of rotating synchronously therewith, the lower limit disk being located below the upper limit disk, the peripheral wall of the lower limit disk having a lower stop portion extending outward; a first positioning block and a second positioning block arranged at intervals along the circumference and used to match the limit block, the first positioning block and the second positioning block being arranged at intervals along the circumference, the first positioning block and the second positioning block being arranged at the peripheral edge of the top wall of the valve cover and protruding from the center; a first stop block and a second stop block arranged at intervals along the circumference, being arranged at the inner cavity wall of the valve cover and protruding from the center, the first stop block being matched with the lower stop portion, and a channel for the upper stop portion in an upward moving state to pass through is formed between the bottom surface of the second stop block and the top wall of the valve cover.

[0008] As a specific limiting method, when the valve core is at the 0 degree position and the valve stem has not moved downward, the first stop block blocks the lower stop portion, and one side of the first positioning block blocks the limit block, and the valve stem cannot rotate clockwise or counterclockwise; when the valve core is at the 0 degree position and the valve stem is in the downward state, the limit block is misaligned with the first positioning block, and the valve stem can drive the valve core to rotate clockwise, and when the valve core rotates to the upper stop portion and the second stop block stop position, the large fire hole is connected to the air intake channel; when the valve core is at the first angle position and the valve stem moves upward, the limit block is located on the other side of the first positioning block, the valve stem can drive the valve core to continue to rotate clockwise, and the upper stop portion is located in the channel; when the valve core is at the third angle position, one side of the second positioning block blocks the limit block, and the valve stem cannot rotate further clockwise. The upper stopper and the limit block on the upper limit plate and the lower stopper on the lower limit plate cooperate with the first stopper, the second stopper and the first stopper on the valve cover, so that in the initial state (the fire holes are blocked), the valve stem cannot drive the valve core to rotate without moving downward; when the valve stem moves downward and rotates to the high fire position, the upper stopper and the second stopper are engaged to realize the positioning of the valve core; when the high fire hole is connected with the air inlet channel and the valve stem moves upward, the valve core can be directly rotated to the low fire position and the fierce fire position, and when the valve core is rotated to the fierce fire position, one side of the second positioning block forms a block on the stopper, and at the low fire position and the fierce fire position, the valve stem can also rotate counterclockwise to return to the high fire position; therefore, the gas cock valve can accurately position the valve core at the high fire or fierce fire position.

[0009] In order to facilitate the assembly of the valve stem, the upper limit disk and the lower limit disk, a protruding retaining ring for performing the upper limit disk upper position is provided on the peripheral wall of the valve stem, the top wall of the valve cover forms a block for the retaining ring, and the valve core is provided with a resting surface for performing the lower limit disk lower position, and the first spring is sleeved on the valve stem and located in the valve cover and supported between the upper limit disk and the lower limit disk. During assembly, it is only necessary to sleeve the upper limit disk on the valve stem and the lower limit disk on the valve core, and the spring not only plays the role of resetting the valve stem upward, but also plays the role of constraining the upper limit disk and the lower limit disk.

[0010] Preferably, the above-mentioned limit block is arc-shaped. The arc-shaped limit block is conducive to the rotation of the upper limit block.

[0011] In order to realize that the rotation of the valve stem can drive the valve core to rotate, and the valve stem can move up and down relative to the valve core, the lower part of the valve stem is flat, and the upper part of the valve core is provided with a slot for the lower part of the valve stem to be inserted. Of course, other existing methods can also be used, such as setting a driving pin on the valve stem.

[0012] In order to realize the independent operation of ignition and fire control, the ventilation cavity is divided into a lower ventilation cavity and an upper ventilation cavity, which are connected through a valve port. A piston rod for opening and closing the valve port is provided through the valve port. The upper end of the piston rod can be pushed by the valve stem moving downward to open the valve port. A second spring is sleeved on the piston rod to keep it moving upward to block the valve port. The ignition hole is connected to the upper ventilation cavity, and the large fire hole, small fire hole and fierce fire hole are connected to the lower ventilation cavity. The ignition hole is ventilated only when the valve stem is pressed downward. In other adjustment processes, because the valve stem is not pressed downward, the piston rod moves upward under the action of the second spring to block the valve port, and the ignition hole is cut off.

[0013] Preferably, the first angle position is 90 degrees, the second angle position is 225 degrees, and the third angle position is 270 degrees. This angle design can meet the design requirements of specific products, and the 90-degree high-fire angle is more in line with the user's operating habits.

[0014] Compared with the prior art, the utility model has the following advantages: the gas cock valve is provided with a fierce fire hole on the basis of the original large fire hole and small fire hole, and the aperture of the fierce fire hole is larger than that of the large fire hole. When fierce fire is needed for grilling, the valve core rotates to the position where the fierce fire hole is connected to the air inlet channel, at which time the gas output is the largest, and fierce fire grilling is performed. Combined with the special positioning structure design, the valve core can be accurately positioned at the high fire or fierce fire position. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model (initial position);

[0016] Figure 2 It is a cross-sectional view of the embodiment of the utility model along the length direction of the air intake passage (initial position);

[0017] Figure 3 It is a cross-sectional view along the length of a channel of an embodiment of the utility model (initial position);

[0018] Figure 4 This is a schematic diagram of the embodiment of the utility model after the valve body is removed (initial position);

[0019] Figure 5 This is a schematic diagram of an embodiment of the utility model after removing the valve body and valve core (initial position);

[0020] Figure 6 Schematic diagram of the cooperation between the limit block, the first stop block and the second stop block in the embodiment of the utility model (initial position);

[0021] Figure 7 Schematic diagram of the cooperation between the limit block, the first stop block and the second stop block in the embodiment of the utility model (first angle position);

[0022] Figure 8It is a schematic diagram of the cooperation between the limit block, the first stop block and the second stop block in the embodiment of the utility model (third angle position);

[0023] Fig. 9 It is a three-dimensional schematic diagram of the upper limit plate in the embodiment of the utility model;

[0024] Fig.10 It is a three-dimensional schematic diagram of the lower limit plate in the embodiment of the utility model;

[0025] Fig.11 This is a three-dimensional schematic diagram of the valve cover in the embodiment of the utility model;

[0026] Fig.12 A three-dimensional schematic diagram of the valve core of the utility model embodiment Figure 1 ;

[0027] Fig.13 A three-dimensional schematic diagram of the valve core of the utility model embodiment Figure 2 ;

[0028] Fig.14 This is a cross-sectional view of the valve core of the utility model embodiment;

[0029] Fig.15 This is a schematic diagram of the gear control of an embodiment of the utility model. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] like Figures 1 to 15 Shown is a preferred embodiment of the utility model.

[0032] A plug valve for a gas oven, comprising

[0033] A valve body 1 is provided with an air inlet passage 1a, a main air outlet passage 1b and an air inlet passage 1c.

[0034] A rotatable valve core 2 is disposed in the valve body 1 , and a ventilation cavity 21 with an opening facing downward is disposed at the lower portion of the valve core 2 . The air outlet passage 1 b is disposed below the valve core and is directly connected to the ventilation cavity 21 .

[0035] A valve cover 3 is fixed to the end of the valve body 1, and a valve stem 5 is pierced on the valve cover 3 for driving the valve core 2 to rotate and move up and down. The valve stem 5 maintains an upward movement tendency under the action of the first spring 4a; the lower part of the valve stem 5 is flat, and a slot 23 is opened on the upper part of the valve core 2 for the lower part of the valve stem 5 to be inserted.

[0036] An ignition hole 2a, a large fire hole 2b, a small fire hole 2c and a fierce fire hole 2d connected to the ventilation cavity 21 are formed on the side wall of the ventilation cavity 21. The aperture of the large fire hole 2b is larger than that of the small fire hole 2c, and the aperture of the fierce fire hole 2d is larger than that of the large fire hole 2b. An auxiliary barrier groove 211 connected to the ignition hole 2a, a large fire barrier groove 212 connected to the large fire hole 2b and a small fire barrier groove 213 connected to the small fire hole 2c are also formed on the outer side wall of the ventilation cavity 21. The rotation of the valve core can determine whether the large fire hole 2b, the small fire hole 2c and the fierce fire hole 2d are connected to the air intake channel 1a, and can also determine whether the ignition hole 2a is connected to the air inlet channel 1c.

[0037] The upper limit plate 6 is sleeved on the valve stem 5 and can rotate and move up and down synchronously therewith. The peripheral wall of the upper limit plate 6 has an upper side stop portion 61 extending outward, and the upper surface of the upper limit plate 6 is provided with an upwardly protruding limit block 62; the limit block 62 is arc-shaped.

[0038] A lower limit plate 7 is sleeved on the valve core 2 and can rotate synchronously therewith, and the lower limit plate 7 is located below the upper limit plate 6. The peripheral wall of the lower limit plate 7 has a lower side stop portion 71 extending outward; an outwardly protruding stop ring 51 is provided on the peripheral wall of the valve stem 5 for performing an upper limit position on the upper limit plate 6, and the top wall of the valve cover 3 forms a block for the stop ring 51, and a rest surface 22 is provided on the valve core 2 for performing a lower limit position on the lower limit plate 7, and the first spring 4a is sleeved on the valve stem 5, located in the valve cover 3 and supported between the upper limit plate 6 and the lower limit plate 7.

[0039] A first positioning block 8a and a second positioning block 8b are arranged along the circumference and spaced apart from each other for engaging with the limit block 62, wherein the first positioning block 8a and the second positioning block 8b are arranged at the periphery of the top wall of the valve cover 3 and protrude from the center;

[0040] The first stopper 9a and the second stopper 9b are arranged at intervals along the circumference, are arranged on the inner wall of the valve cover 3 and protrude toward the center, the first stopper 9a is matched with the lower stopper 71, and a channel X is formed between the bottom surface of the second stopper 9b and the top wall of the valve cover 3 for the upper stopper 61 in the upward state to pass through.

[0041] When the valve core 2 is at the 0 degree position, the air inlet passage 1a is blocked from the large fire hole 2b, the small fire hole 2c and the fierce fire hole 2d, and the air inlet passage 1c is connected to the ignition hole 2a.

[0042] When the valve core 2 rotates from the 0 degree position to the first angle position, the air intake passage 1a is communicated with the large fire hole 2b.

[0043] When the valve core 2 rotates from the first angular position to the second angular position, the air intake passage 1a is communicated with the small fire hole 2c.

[0044] When the valve core 2 rotates from the second angular position to the third angular position, the air intake passage 1a is communicated with the fierce fire hole 2d.

[0045] When the valve core 2 is at the 0 degree position and the valve stem does not move downward, the first stopper 9a blocks the lower stopper 71, and one side of the first positioning block 8a blocks the limit block 62, so that the valve stem 5 cannot rotate clockwise or counterclockwise.

[0046] When the valve core 2 is at the 0 degree position and the valve stem 5 is in the downward movement state, the limit block 62 is misaligned with the first positioning block 8a, and the valve stem 5 can drive the valve core 2 to rotate clockwise. When the valve core 2 rotates to the upper stop portion 61 and the second stop block 9b, the large fire hole 2b is connected with the air intake passage 1a;

[0047] When the valve core 2 is located at the first angular position and the valve stem 5 moves upward, the limit block 62 is located on the other side of the first positioning block 8a, the valve stem 5 can drive the valve core 2 to continue to rotate clockwise, and the upper stop portion 61 is located in the channel X.

[0048] When the valve core 2 is located at the third angular position, one side of the second positioning block 8b blocks the limit block 62, and the valve stem 5 cannot further rotate clockwise.

[0049] The first angular position is 90 degrees, the second angular position is 225 degrees, and the third angular position is 270 degrees.

[0050] The ventilation chamber 21 is divided into a lower ventilation chamber 21a and an upper ventilation chamber 21b, which are connected by a valve port 24. A piston rod 10 for opening and closing the valve port 24 is provided through the valve port 24. The upper end of the piston rod 10 can be pushed by the downwardly moved valve stem 5 to open the valve port 24. A second spring 4b is sleeved on the piston rod 10 to keep it from moving upward to block the valve port 24. The ignition hole 2a is connected to the upper ventilation chamber 21b, and the large fire hole 2b, the small fire hole 2c and the fierce fire hole 2d are connected to the lower ventilation chamber 21a.

[0051] The working principle and process of this gas cock valve are as follows: Fig.15 shown.

[0052] 1. In the initial (closed) state, if Figures 1 to 6 As shown, we define it as the 0 degree position, the air inlet channel 1a is blocked from the large fire hole 2b, the small fire hole 2c and the fierce fire hole 2d, and the air inlet channel 1c is connected to the ignition hole 2a. When the valve core 2 is at the 0 degree position and the valve stem does not move downward, the first stopper 9a blocks the lower stopper 71, and one side of the first positioning block 8a blocks the limit block 62, and the valve stem 5 cannot rotate clockwise or counterclockwise.

[0053] 2. During ignition, the valve stem 5 is pressed down at the 0 degree position, the valve stem 5 moves downward, the limit block 62 is misaligned with the first positioning block 8a, the valve stem 5 can drive the valve core 2 to rotate clockwise, the upper end of the piston rod 10 can be pushed by the downward-moving valve stem 5 to open the valve port 24, the ignition hole 2a is connected to the intake channel 1a and the air bleed channel 1c, and ignition begins. After releasing, the piston rod 10 closes the valve port 24.

[0054] 3. When the valve core 2 rotates from the 0 degree position to the first angle position (90 degrees), Figure 7 As shown, the valve stem 5 is in a downward movement state, and when the valve core 2 rotates to the position where the upper gear portion 61 and the second gear block 9b are engaged, the valve stem 5 cannot continue to rotate clockwise, and the large fire hole 2b is connected to the air inlet channel 1a; if the user wants to adjust the fire, loosen the valve stem 5, and the upper limit plate 6 moves up with the valve stem 5 under the action of the first spring 4a, and the limit block 62 is located on the other side of the first positioning block 8a. The valve stem 5 can drive the valve core 2 to continue to rotate clockwise, and the upper gear portion 61 is located in the channel X. When the valve core 2 rotates from the first angular position to the second angular position (225 degrees), the air inlet channel 1a is connected to the small fire hole 2c. When the valve core 2 rotates from the second angular position to the third angular position (270 degrees), as shown Figure 8 As shown, the air inlet passage 1a is connected to the fierce fire hole 2d, one side of the second positioning block 8b blocks the limit block 62, and the valve stem 5 cannot rotate further clockwise.

[0055] 4. During the flame-off process, the valve stem 5 is pressed down and moves downward. The limit block 62 is misaligned with the first positioning block 8a. The valve stem 5 can drive the valve core 2 to rotate counterclockwise. When the valve stem 5 rotates counterclockwise to the first stop block 9a to block the lower stop portion 71, the valve stem 5 cannot continue to rotate counterclockwise and is at the 0 degree position.

[0056] It should be noted that in the description of this embodiment, the terms "clockwise, counterclockwise", "front, back", "left, right", "inside, outside", "upper, lower", etc. indicating directions or positional relationships are all based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A plug valve for a gas oven, comprising A valve body (1) having an air inlet passage (1a), a main air outlet passage (1b) and an air inlet passage (1c); A rotatable valve core (2) is disposed in the valve body (1), a ventilation cavity (21) with an opening facing downward is disposed at the lower part of the valve core (2), and the air outlet passage (1b) is disposed below the valve core and is directly connected to the ventilation cavity (21); A valve cover (3) is fixed to the end of the valve body (1), and a valve stem (5) is provided on the valve cover (3) for driving the valve core (2) to rotate and can move up and down. The valve stem (5) maintains an upward movement tendency under the action of a first spring (4a); Features: The side wall of the ventilation cavity (21) is provided with an ignition hole (2a), a large fire hole (2b), a small fire hole (2c) and a fierce fire hole (2d) which are connected to the ventilation cavity (21); the aperture of the large fire hole (2b) is larger than the aperture of the small fire hole (2c); the aperture of the fierce fire hole (2d) is larger than the aperture of the large fire hole (2b); the outer side wall of the ventilation cavity (21) is also provided with an auxiliary barrier groove (211) which is connected to the ignition hole (2a), a large fire barrier groove (212) which is connected to the large fire hole (2b) and a small fire barrier groove (213) which is connected to the small fire hole (2c); the rotation of the valve core can determine whether the large fire hole (2b), the small fire hole (2c) and the fierce fire hole (2d) are connected to the air intake channel (1a), and can also determine whether the ignition hole (2a) is connected to the air inlet channel (1c).

2. The plug valve for a gas grill according to claim 1, characterized in that: When the valve core (2) is at a 0-degree position, the air intake passage (1a) is blocked from the large fire hole (2b), the small fire hole (2c) and the fierce fire hole (2d), and the air inlet passage (1c) is connected to the ignition hole (2a); When the valve core (2) rotates from the 0 degree position to the first angle position, the air intake passage (1a) is connected to the large fire hole (2b); When the valve core (2) rotates from the first angle position to the second angle position, the air intake passage (1a) is connected to the small fire hole (2c); When the valve core (2) rotates from the second angle position to the third angle position, the air intake passage (1a) is connected to the fierce fire hole (2d).

3. The plug valve for a gas grill according to claim 1, characterized in that: Also includes An upper limit plate (6) is sleeved on the valve stem (5) and can rotate synchronously with the valve stem and move up and down, the peripheral wall of the upper limit plate (6) has an upper side stop portion (61) extending outward, and the upper surface of the upper limit plate (6) is provided with an upwardly protruding limit block (62); A lower limit plate (7) sleeved on the valve core (2) and capable of rotating synchronously therewith, the lower limit plate (7) being located below the upper limit plate (6), and the peripheral wall of the lower limit plate (7) having a lower side stop portion (71) extending outwards; A first positioning block (8a) and a second positioning block (8b) arranged at intervals along the circumference and used for engaging with the limit block (62), wherein the first positioning block (8a) and the second positioning block (8b) are arranged on the periphery of the top wall of the valve cover (3) and protrude from the center; A first stopper (9a) and a second stopper (9b) are arranged at intervals along the circumference, are arranged on the inner wall of the valve cover (3) and protrude toward the center, the first stopper (9a) is matched with the lower stopper (71), and a channel (X) is formed between the bottom surface of the second stopper (9b) and the top wall of the valve cover (3) for the upper stopper (61) in an upward moving state to pass through.

4. The plug valve for a gas grill according to claim 3, characterized in that: When the valve core (2) is at the 0 degree position and the valve stem has not moved downward, the first stopper (9a) blocks the lower stopper (71), and one side of the first positioning block (8a) blocks the limit block (62), so that the valve stem (5) cannot rotate clockwise or counterclockwise; When the valve core (2) is at a 0-degree position and the valve stem (5) is in a downward movement state, the limit block (62) is misaligned with the first positioning block (8a), and the valve stem (5) can drive the valve core (2) to rotate clockwise. When the valve core (2) rotates to a position where the upper stop portion (61) and the second stop block (9b) are engaged, the large fire hole (2b) is connected to the air intake passage (1a); When the valve core (2) is located at the first angle position and the valve stem (5) moves upward, the limit block (62) is located on the other side of the first positioning block (8a), the valve stem (5) can drive the valve core (2) to continue to rotate clockwise, and the upper stop portion (61) is located in the channel (X); When the valve core (2) is located at the third angular position, one side of the second positioning block (8b) blocks the limit block (62), and the valve stem (5) cannot further rotate clockwise.

5. The plug valve for a gas grill according to claim 3, characterized in that: The valve stem (5) is provided with a protruding retaining ring (51) on the peripheral wall thereof for performing an upper limit position on the upper limit disk (6); the top wall of the valve cover (3) blocks the retaining ring (51); the valve core (2) is provided with a resting surface (22) for performing a lower limit position on the lower limit disk (7); the first spring (4a) is sleeved on the valve stem (5), located in the valve cover (3) and supported between the upper limit disk (6) and the lower limit disk (7).

6. The plug valve for a gas grill according to claim 3, characterized in that: The limiting block (62) is arc-shaped.

7. The plug valve for a gas grill according to claim 1, characterized in that: The lower part of the valve stem (5) is flat, and the upper part of the valve core (2) is provided with a slot (23) for inserting the lower part of the valve stem (5).

8. The plug valve for a gas grill according to claim 1, characterized in that: The ventilation chamber (21) is divided into a lower ventilation chamber (21a) and an upper ventilation chamber (21b), which are connected via a valve port (24). A piston rod (10) for opening and closing the valve port (24) is provided through the valve port (24). The upper end of the piston rod (10) can be pushed by the valve rod (5) moving downward to open the valve port (24). A second spring (4b) is sleeved on the piston rod (10) to keep the piston rod (10) from moving upward to block the valve port (24). The ignition hole (2a) is connected to the upper ventilation chamber (21b), and the large fire hole (2b), the small fire hole (2c) and the fierce fire hole (2d) are connected to the lower ventilation chamber (21a).

9. The plug valve for a gas grill according to claim 2, characterized in that: The first angular position is 90 degrees, the second angular position is 225 degrees, and the third angular position is 270 degrees.

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