Gas distribution plate and plug valve

Abstract

The present invention discloses a gas distribution plate and a plug valve gas distribution plate. The gas distribution plate is provided with a vent hole. A gas distribution groove connected to the vent hole is provided on at least one side of the vent hole along the rotation direction of the gas distribution plate. The gas distribution groove extends along the rotation direction of the gas distribution plate. The gas distribution plate is composed of a first gas distribution plate and a second gas distribution plate whose end faces overlap and are sealed and fixed to each other. The first gas distribution plate is provided with a through hole I, which consists of a vent portion and a gas distribution portion. The second gas distribution plate is provided with a through hole II, which overlaps and penetrates the vent portion to form the vent hole. The gas distribution portion and the end face of the second gas distribution plate form the gas distribution groove. The gas distribution plate of the present invention is easy to process and manufacture.

Description

[0001] This application is a divisional application of the invention patent application with the invention name being “A Plug Valve”, the application date being March 15, 2017, and the application number being “201710151721.6”. Technical Field

[0002] The present invention relates to the field of gas valves, in particular to a gas distribution plate and a plug valve. Background Art

[0003] Chinese cuisine is diverse and renowned worldwide. Chinese cooking requires varying heat control, using different heat levels at different times for each dish. Traditional gas stoves, however, often use a plunger valve to adjust the heat level. Often, turning the knob for a long time yields little change, but further turning can lead to a sudden, dramatic change. The desired heat level is often only achieved within a narrow range. This requires constant eye contact while adjusting the heat level, making it inconvenient. Summary of the Invention

[0004] In order to overcome the above-mentioned defects and deficiencies, the present invention provides the following technical solutions: a plug valve, comprising a valve body, a valve core accommodating chamber provided on the valve body, a valve core provided in the valve core accommodating chamber, and the two are rotatably sealed and connected, a valve stem is provided at one end of the valve core, an air outlet is further provided on the valve body, the air outlet is communicated with the valve core accommodating chamber, a vent groove is provided on the valve core, and as the valve core rotates, the vent groove and the air outlet are communicated with different sizes and can completely close the air outlet, characterized in that the valve body is provided with an air distribution chamber, an air inlet is provided in the air distribution chamber and is communicated with an air source, the air distribution chamber is also communicated with the valve core accommodating chamber, and an air distribution disk is provided in the air distribution chamber. The air distribution disk can rotate synchronously with the valve core through a transmission device, and the air distribution disk is rotatably and sealedly connected to the air distribution chamber. A vent is provided on the air distribution disk, and a gas distribution groove connected to the vent is provided on at least one side of the vent along the rotation direction of the air distribution disk. The gas distribution groove extends along the rotation direction of the air distribution disk. The gas distribution groove and the vent can partially or completely cover the air inlet when the air distribution disk rotates, and the gas distribution groove and the plane inside the air distribution chamber form an air distribution channel. When the plunger valve is closed, the air distribution disk closes the air inlet. When the plunger valve is opened, the air inlet is connected to the vent via the gas distribution channel or is directly connected to the vent.

[0005] Preferably, the gas distribution groove comprises a plurality of groove sections of different widths, and the groove sections are interconnected, so as to conveniently realize segmented control of the gas output of the plunger valve.

[0006] Preferably, the width of the gas distribution groove gradually narrows or increases along the rotation direction of the gas distribution disk, so as to conveniently realize continuous control of the gas output of the plunger valve.

[0007] Preferably, air distribution grooves are provided on both sides of the air vent along the rotation direction of the air distribution disk, and the air distribution grooves extend along the rotation direction of the air distribution disk. The air distribution grooves and the air vent can partially or completely cover the air vent when the air distribution disk rotates.

[0008] Preferably, the gas distribution plate is composed of a first gas distribution plate and a second gas distribution plate whose end faces overlap and overlap, and the first gas distribution plate and the second gas distribution plate are sealed and fixed to each other. The first gas distribution plate is provided with a through hole I, which is composed of a ventilation portion and a gas distribution portion. The second gas distribution plate is provided with a through hole II, which overlaps with the ventilation portion and penetrates each other to form a ventilation hole. The gas distribution portion and the end face of the second gas distribution plate form a gas distribution groove. This allows, on the one hand, to obtain very fine gas distribution portion through holes through wire cutting, laser cutting, etc., thereby achieving control of very small airflows; on the other hand, the cross-sectional area of ​​the gas distribution groove can be conveniently adjusted by adjusting the thickness of the first gas distribution plate, thereby conveniently adjusting the flow rate.

[0009] Preferably, the ventilation portion is a fan-shaped through hole, and the air distribution portion includes a left air distribution portion and a right air distribution portion. The left air distribution portion is composed of a fan-shaped through hole A' and a fan-shaped through hole B' that are interconnected, and the right air distribution portion is composed of a fan-shaped through hole C' and a fan-shaped through hole D' that are interconnected. The width of each fan-shaped through hole in the air distribution portion along its radial direction is fan-shaped through hole A'>fan-shaped through hole B'>fan-shaped through hole C'>fan-shaped through hole D', and the shape, size and position of the through hole II are the same as those of the ventilation portion.

[0010] Preferably, the air distribution plate is composed of a first air distribution plate and a second air distribution plate whose end faces overlap with each other, and the first air distribution plate and the second air distribution plate are sealed and fixed to each other. A through hole I' and a through hole I" are provided on the first air distribution plate, and the through hole I" is arranged on the left side of the through hole I'. The through hole I' and the through hole I" are both composed of a ventilation part and an air distribution part. The ventilation part of the through hole I' is a fan-shaped through hole Z, and the air distribution part of the through hole I' includes a left air distribution part and a right air distribution part. The right air distribution part is composed of a fan-shaped through hole A and a fan-shaped through hole B that are interconnected, and the left air distribution part is composed of a fan-shaped through hole C and a fan-shaped through hole D that are interconnected. The ventilation part of the through hole I" is a fan-shaped through hole Y, and the distribution part of the through hole I" is a fan-shaped through hole Y. The air section is arranged on the left side of the fan-annular through hole Y, and is composed of a fan-annular through hole E and a fan-annular through hole F which are interconnected. The radial width of each of the fan-annular through holes that constitute the air distribution section is fan-annular through hole A>fan-annular through hole B>fan-annular through hole C>fan-annular through hole D>fan-annular through hole E>fan-annular through hole F. The central angle between the left radius of the fan-annular through hole D and the right radius of the fan-annular through hole Y is less than the maximum angle between the lines connecting any two points on the air inlet and the rotation center of the air distribution disk. The second air distribution plate is provided with a through hole II' which is the same in shape, size and position as the fan-annular through hole Z. The second air distribution plate is also provided with a through hole II" which is the same in shape, size and position as the fan-annular through hole Y.

[0011] Preferably, the plunger valve further includes a front cover. A protrusion is provided on the circumferential surface of the valve stem. The valve stem passes through a through hole X in the front cover. A plurality of positioning grooves are provided on the inner end surface of the through hole X along a circle concentric with the through hole X. The two sides of the positioning grooves are inclined outward. When the plunger valve is opened, the upper portion of the protrusion engages with the positioning groove. A spring A is provided between the valve stem and the front cover. In this manner, as the valve stem rotates during use, the protrusions will sink into different positioning grooves, thereby achieving positioning, allowing the user to accurately determine when the air flow rate gear has been switched.

[0012] Preferably, a ejector pin is provided at the center of the valve core, the ejector pin is slidingly and sealingly connected to the valve core, a spring B is provided between the ejector pin and the valve core, a back cover is provided at the rear of the valve body, the back cover is sealed and connected to the valve body, and a rotatable push rod is provided between the two, the valve body is also provided with an air inlet hole connected to the air source, a solenoid valve accommodating chamber is provided on the valve body, the air inlet hole is connected to the solenoid valve accommodating chamber, the solenoid valve accommodating chamber is connected to the air inlet, a solenoid valve is provided in the solenoid valve accommodating chamber, the solenoid valve can open or close the air inlet hole, a thermocouple is provided at the upper end of the solenoid valve, and an inner cover is provided at the front of the valve body. The inner cover is sealed and connected to the valve body, and the front end of the valve core passes through the through hole U on the inner cover. The transmission device includes a driving gear, a driven gear and a transmission shaft. The driving gear is arranged on the outside of the inner cover, sleeved on the front end of the valve core, and rotates synchronously with the valve core. The driven gear is also arranged on the outside of the inner cover and meshes with the driving gear. One end of the transmission shaft is connected to the gas distribution plate, and the other end passes through the inner cover and is connected to the driven gear. The front cover is arranged on the outer end surface of the inner cover to shield the driving gear and the driven gear. When the plunger valve is opened and closed, the valve stem drives the valve core to rotate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention adds a gas distribution cavity to the plunger valve body, disposes a gas distribution disk in the gas distribution cavity, and provides a vent on the gas distribution disk. At least one side of the vent along the rotation direction of the gas distribution disk is provided with a gas distribution groove connected to the vent. The gas distribution groove extends along the rotation direction of the gas distribution disk. When the gas distribution groove and the vent rotate with the gas distribution disk, they can partially or completely cover the air inlet disposed in the gas distribution cavity and connected to the gas source. The gas distribution disk is connected to the valve core via a transmission device and rotates synchronously with the valve core. By setting the shape of the gas distribution groove, the gas output volume can be kept consistent within a certain rotation angle, thereby facilitating the user to adjust the fire power of the gas stove without having to constantly watch and slowly adjust the fire power as with a traditional gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a first specific embodiment of the present invention.

[0015] Figure 2 It is a full cross-sectional view of the plunger valve along the valve core axis in the first specific embodiment of the present invention.

[0016] Figure 3 It is a full cross-sectional view of the plunger valve along the axial cross-section of the gas distribution plate drive shaft in the first specific embodiment of the present invention.

[0017] Figure 4 It is a schematic diagram of the plunger valve in the first specific embodiment of the present invention with the front cover removed.

[0018] Figure 5It is a schematic diagram of the front cover of the plunger valve in the first specific embodiment of the present invention.

[0019] Figure 6 It is a schematic diagram of the plunger valve stem in the first specific embodiment of the present invention.

[0020] Figure 7 It is a front view of the first distribution plate of the plunger valve in the first specific embodiment of the present invention.

[0021] Figure 8 It is a front view of the second distribution plate of the plunger valve in the first specific embodiment of the present invention.

[0022] Figure 9 It is a schematic diagram of the relative positions of the ventilation grooves on the valve core and the air outlets on the valve body, and the relative positions of the air distribution disk and the air inlet of the air distribution cavity when the plunger valve in the first specific embodiment of the present invention is in different working positions.

[0023] Figure 10 It is a schematic diagram of a second specific embodiment of the present invention.

[0024] Figure 11 It is a front view of the first distribution plate of the plunger valve in the second specific embodiment of the present invention.

[0025] Figure 12 It is a front view of the second distribution plate of the plunger valve in the second specific embodiment of the present invention.

[0026] Figure 13 It is a schematic diagram of the relative positions of the ventilation grooves on the valve core and the air outlets on the valve body, and the relative positions of the air distribution disk and the air inlet of the air distribution cavity when the plunger valve has different working positions in the second specific embodiment of the present invention. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] Example 1

[0029] Figures 1 to 9The plug valve shown in the figure comprises a valve body 1, a valve core accommodating cavity is provided on the valve body 1, a valve core 7 is provided in the valve core accommodating cavity, and the two are rotatably sealed and connected, the valve body 1 is also provided with three air outlets which are respectively connected to the outer ring, middle ring and inner ring on the gas stove burner, the three air outlets are connected to the valve core accommodating cavity, the valve core 7 is provided with three ventilation grooves, which rotate with the valve core 7, and the ventilation grooves are connected to the air outlets of different sizes and can completely close the air outlets, a thimble 8 is provided in the center of the valve core 7, the thimble 8 is slidably and sealedly connected to the valve core 7, a spring B8a is provided between the thimble 8 and the valve core 7, a back cover 10 is provided at the rear of the valve body 1, the back cover 10 is sealed and connected to the valve body 1, and the two A rotatable push rod 9 is provided between them, and the ejector pin 8 can push the push rod 9 to rotate. The valve body 1 is also provided with an air inlet 1c connected to the gas source, and the valve body 1 is provided with a solenoid valve accommodating chamber 1b, and the air inlet 1c is connected to the solenoid valve accommodating chamber 1b. A solenoid valve 6 is provided in the solenoid valve accommodating chamber 1b, and the solenoid valve 6 can open or close the air inlet 1c. A thermocouple is provided at the upper end of the solenoid valve 6, and the thermocouple is connected to a probe provided on the burner. The supporting part on the push rod 9 is inserted into the solenoid valve accommodating chamber 1b. As the push rod 9 rotates, the supporting part can lift or lower the solenoid valve 6. A gas distribution chamber 1a is provided on the valve body 1, and an air inlet is provided in the gas distribution chamber 1a, and the air inlet is connected to the solenoid valve accommodating chamber 1b. The air distribution cavity 1a is also communicated with the valve core accommodating cavity. An air distribution disc is provided in the air distribution cavity 1a. The air distribution disc can rotate synchronously with the valve core 7 through a transmission device. The air distribution disc is formed by overlapping and bonding the end faces of a first air distribution plate 1a1 and a second air distribution plate 1a2, and the first air distribution plate 1a1 and the second air distribution plate 1a2 are sealed to each other. A through hole I' and a through hole I" are provided on the first air distribution plate 1a1. The through hole I" is arranged on the left side of the through hole I'. The through hole I' and the through hole I" are both composed of a ventilation part and an air distribution part. The ventilation part of the through hole I' is a fan-shaped through hole Z1a1a extending along the rotation direction of the air distribution disc. The air distribution part of the through hole I' includes a left air distribution part and a right air distribution part. The right air distribution part It is composed of a fan-shaped through hole A B and a fan-shaped through hole B A that are interconnected and extend along the rotation direction of the valve distribution disc. The left valve distribution part is composed of a fan-shaped through hole C C and a fan-shaped through hole D D that are interconnected and extend along the rotation direction of the valve distribution disc. The ventilation part of the through hole I" is a fan-shaped through hole Y1a1b that extends along the rotation direction of the valve distribution disc. The valve distribution part of the through hole I" is arranged on the left side of the fan-shaped through hole Y1a1b, and is composed of a fan-shaped through hole E E and a fan-shaped through hole F that are interconnected and extend along the rotation direction of the valve distribution disc. The radial width of each of the fan-shaped through holes that make up the valve distribution part is fan-shaped through hole A B> fan-shaped through hole B A> fan-shaped through hole C C> fan-shaped through hole D D> fan-shaped through hole E E> fan-shaped through hole F.The central angle between the left radius of the fan-shaped through hole D D and the right radius of the fan-shaped through hole Y1a1b is smaller than the maximum angle between any two points on the air inlet and the rotation center of the air distribution disc. The second air distribution plate 1a2 is provided with a through hole II'1a2a that is identical in shape, size and position to the fan-shaped through hole Z1a1a. The second air distribution plate 1a2 is also provided with a through hole II"1a2b that is identical in shape, size and position to the fan-shaped through hole Y1a1b. The first air distribution plate 1a1 is rotatably sealed with sealing grease and the fan-shaped through hole Z1a1a and the through hole II'1a2a coincide with each other and penetrate each other to form a vent. The air distribution portion and the second air distribution plate 1a2 are connected. The a2 end surface forms an air distribution groove, and the air distribution groove and the air vent can partially or completely cover the air inlet when the air distribution disk rotates. The air distribution groove and the inner plane of the air distribution chamber 1a form an air distribution channel. When the plunger valve is closed, the air distribution disk seals the air inlet. When the plunger valve is opened, the air inlet is connected to the air vent through the air distribution channel or directly to the air vent. The front part of the valve body 1 is provided with an inner cover 5, and the inner cover 5 is sealed with the valve body 1. The front end of the valve core 7 passes through the through hole U on the inner cover 5. The transmission device includes a driving gear 11, a driven gear 12 and a transmission shaft 13. The driving gear 11 is arranged on the outside of the inner cover 5. It is provided on the front end of the valve core 7 and rotates synchronously with the valve core 7. The driven gear 12 is also provided on the outside of the inner cover 5 and meshes with the driving gear 11. One end of the transmission shaft is connected to the valve plate, and the other end passes through the inner cover 5 and is connected to the driven gear 12. The spring C13c is sleeved on the shaft section located in the valve chamber on the roof shaft and presses the valve plate against the bottom surface of the valve chamber. The front cover 2 is provided on the outer end surface of the inner cover to shield the driving gear 11 and the driven gear 12. A through hole X2a is provided on the front cover 2. A plurality of positioning grooves 2b are provided on the inner end surface of the through hole X2a along a circle concentric with the through hole X2a. The two sides of the positioning groove 2b The side surfaces are tilted outward, and the valve stem 4 passes through the through hole X2a. A hole S4a is provided on the lower end surface of the valve stem 4, and a protrusion 4b is provided on the circumferential surface of the lower end of the valve stem 4. The valve stem 4 is provided with a shaft section R with a smaller diameter, and a tapered surface 4c is provided between the shaft section R and its upper shaft section. The valve stem 4 is also provided with a retaining ring 4d, and a spring E4e is provided between the lower end surface of the retaining ring 4d and the outer end surface of the front cover 2. The valve stem 4 is coaxial with the valve core. A hole H is provided at the front end of the valve core 7, and a retaining groove is also provided on the front end surface of the valve core 7. The protrusion 4b can be inserted into the retaining groove, so that rotating the valve stem 4 drives the valve core to rotate together. At the same time, the ejector pin 8 can be partially inserted into the hole S4a and pushed by the valve stem 4, thereby pushing the push rod. The front cover 2 is also provided with an ignition switch 3.

[0030] During operation, the valve stem 4 is first depressed. The conical surface 4c interacts with the button on the ignition switch 3, turning on the ignition switch. Simultaneously, the protrusion 4b on the valve stem 4 inserts into the slot on the front end of the valve core 7. The ejector pin 8 is inserted into the hole S4a on the valve stem 4 and is pushed out of the valve core 7 by the valve stem 4, thereby rotating the push rod 9. The supporting portion on the push rod 9 lifts the solenoid valve 6, allowing gas to enter the air inlet of the gas distribution chamber. However, because the gas distribution plate blocks the air inlet, the gas cannot enter the burner. Then, while the valve stem 4 is kept depressed, it is rotated. The valve core 7 rotates with the valve stem 4, connecting the various vent grooves thereon with the various air outlets. Simultaneously, the gas distribution plate rotates synchronously through the transmission mechanism, and the vent holes cover the air inlets. Gas enters the gas distribution chamber through the vent holes, then enters the valve core accommodating chamber, and then through the vent grooves on the valve core 7 to the various air outlets. Finally, it enters the burner and is ignited by the ignition switch. At this point, the fire is at maximum power. When the probe on the burner is heated, the thermocouple conducts, and the solenoid valve 6 engages and remains open. When the valve stem 4 is released, the ejector pin 8 returns to its original position under the action of spring B, which in turn resets the push rod 9. The valve stem 4 also returns upward, and its boss 4b engages the positioning groove 2b on the front cover 2. To adjust the power, the valve stem 4 is rotated. The upper edge of the boss 4b interacts with the inclined side of the positioning groove 2b, causing the valve stem 4 to rotate and move downward. This compresses spring E4e, and when the boss 4b rotates to the next positioning groove 2b, it moves upward under the action of spring E4e and reengages the new positioning groove 2b, thereby adjusting the power to the new setting.

[0031] Example 2

[0032] Figures 10 to 13 This is the second embodiment of the present invention. The difference between Example 2 and Example 1 is that the valve body 1 of Example 2 is provided with two air outlets, the valve core 7 is provided with two mutually connected vent grooves, the first air distribution plate 1a1 is provided with a through hole I, the through hole I is composed of a vent portion and an air distribution portion, the vent portion is a fan-shaped through hole 1a1a', the air distribution portion includes a left air distribution portion and a right air distribution portion, the left air distribution portion is composed of a fan-shaped through hole A'B' and a fan-shaped through hole B'A' that are interconnected, and the right air distribution portion is composed of a fan-shaped through hole A'B' and a fan-shaped through hole B'A' that are interconnected. The annular through hole C' and the fan-shaped annular through hole D'D' are composed. The width of each fan-shaped annular through hole in the air distribution part along the radial direction is fan-shaped through hole A'B'> fan-shaped through hole B'A'> fan-shaped through hole C'C'> fan-shaped through hole D'D'. A through hole II is provided on the second air distribution plate 1a2. The shape, size and position of the through hole II are the same as those of the ventilation part. The through hole II coincides with the ventilation part and penetrates each other to form a ventilation hole. The air distribution part and the end face of the second air distribution plate 1a2 form an air distribution groove.

[0033] Example 3

[0034] Example 3 is basically the same as Example 2, except that in Example 3, the width of the left air distribution portion on the first air distribution plate 1a1 gradually increases along the rotation direction of the air distribution disk, and the width of the right air distribution portion gradually narrows along the rotation direction of the air distribution disk.

[0035] Compared with the prior art, the present invention has the following beneficial effects: the present invention adds a gas distribution cavity to the plunger valve body, disposes a gas distribution disk in the gas distribution cavity, and provides a vent on the gas distribution disk. At least one side of the vent along the rotation direction of the gas distribution disk is provided with a gas distribution groove connected to the vent. The gas distribution groove extends along the rotation direction of the gas distribution disk. When the gas distribution groove and the vent rotate with the gas distribution disk, they can partially or completely cover the air inlet disposed in the gas distribution cavity and connected to the gas source. The gas distribution disk is connected to the valve core via a transmission device and rotates synchronously with the valve core. By setting the shape of the gas distribution groove, the gas output volume can be kept consistent within a certain rotation angle, thereby facilitating the user to adjust the fire power of the gas stove without having to constantly watch and slowly adjust the fire power as with a traditional gas valve.

[0036] While the present invention has been described in detail above, the present invention is not limited to the specific embodiments described herein. Those skilled in the art will appreciate that other modifications and variations may be made without departing from the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A gas distribution disk, wherein the gas distribution disk is provided with a vent hole, and at least one side of the vent hole along the rotation direction of the gas distribution disk is provided with a gas distribution groove connected to the vent hole, and the gas distribution groove extends along the rotation direction of the gas distribution disk, characterized in that: The air distribution plate is composed of a first air distribution plate (1a1) and a second air distribution plate (1a2) whose end faces overlap and overlap with each other, and the first air distribution plate (1a1) and the second air distribution plate (1a2) are sealed and fixed to each other, the first air distribution plate (1a1) is provided with a through hole I, the through hole I is composed of a ventilation part and an air distribution part, the second air distribution plate (1a2) is provided with a through hole II, the through hole II and the ventilation part overlap and penetrate each other to form a ventilation hole, and the air distribution part and the end face of the second air distribution plate (1a2) form an air distribution groove; The ventilation portion is a fan-shaped through hole (1a1a'), and the air distribution portion includes a left air distribution portion and a right air distribution portion. The left air distribution portion is composed of a fan-shaped through hole A' (B') and a fan-shaped through hole B' (A') that are interconnected, and the right air distribution portion is composed of a fan-shaped through hole C' (C') and a fan-shaped through hole D' (D') that are interconnected. The width of each fan-shaped through hole in the air distribution portion along its radial direction is fan-shaped through hole A' (B') > fan-shaped through hole B' (A') > fan-shaped through hole C' (C') > fan-shaped through hole D' (D'), and the shape, size and position of the through hole II are the same as those of the ventilation portion.

2. The gas distribution plate according to claim 1, characterized in that The gas distribution groove includes a plurality of groove sections with different widths, and the groove sections are interconnected.

3. The gas distribution plate according to claim 1, characterized in that The width of the gas distribution groove gradually narrows or increases along the rotation direction of the gas distribution disk.

4. The gas distribution plate according to any one of claims 1 to 3, characterized in that: Air distribution grooves are provided on both sides of the air vent along the rotation direction of the air distribution disc, and the air distribution grooves extend along the rotation direction of the air distribution disc.

5. A gas distribution disk, wherein the gas distribution disk is provided with a vent hole, and at least one side of the vent hole along the rotation direction of the gas distribution disk is provided with a gas distribution groove connected to the vent hole, and the gas distribution groove extends along the rotation direction of the gas distribution disk, characterized in that: The air distribution plate is composed of a first air distribution plate (1a1) and a second air distribution plate (1a2) whose end faces overlap and overlap with each other, and the first air distribution plate (1a1) and the second air distribution plate (1a2) are sealed and fixed to each other, the first air distribution plate (1a1) is provided with a through hole I' and a through hole I'', and the through hole I' and the through hole I'' are both composed of a ventilation part and an air distribution part, and the second air distribution plate (1a2) is provided with a through hole II' (1a2a) and a through hole II'' (1a2b) which are respectively located at the same position as the ventilation parts of the through hole I' and the through hole I''; The through hole I'' is arranged on the left side of the through hole I', and the ventilation part of the through hole I' is a fan-shaped through hole Z (1a1a). The air distribution part of the through hole I' includes a left air distribution part and a right air distribution part. The right air distribution part is composed of a fan-shaped through hole A (B) and a fan-shaped through hole B (A) that are interconnected. The left air distribution part is composed of a fan-shaped through hole C (C) and a fan-shaped through hole D (D) that are interconnected. The ventilation part of the through hole I'' is a fan-shaped through hole Y (1a1b), the air distribution portion of the through hole I'' is arranged on the left side of the fan-shaped through hole Y (1a1b), and is composed of a fan-shaped through hole E (E) and a fan-shaped through hole F (F) that are interconnected. The radial width of each of the fan-shaped through holes that constitute the air distribution portion is fan-shaped through hole A (B) > fan-shaped through hole B (A) > fan-shaped through hole C (C) > fan-shaped through hole D (D) > fan-shaped through hole E (E) > fan-shaped through hole F (F).

6. The gas distribution plate according to claim 5, characterized in that The central angle between the left radius of the fan-shaped through hole D (D) and the right radius of the fan-shaped through hole Y (1a1b) is smaller than the maximum angle between the lines connecting any two points on the air inlet and the rotation center of the air distribution disk.

7. The gas distribution plate according to claim 6, characterized in that The second air distribution plate (1a2) is provided with a through hole II' (1a2a) having the same shape and size as the fan-shaped through hole Z (1a1a), and the second air distribution plate (1a2) is also provided with a through hole II'' (1a2b) having the same shape and size as the fan-shaped through hole Y (1a1b).

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