A gas hob

Abstract

A gas stove comprises a panel (1), an air inlet seat (2) with a gas passage (20) having a gas inlet (20a) for fluid communication with a gas source and a gas outlet (20b) for gas output, and an ejector pipe (3) arranged above the panel (1). The panel (1) is provided with a through hole (10) penetrating the thickness of the panel at the position corresponding to the air inlet seat (2). The air inlet seat (2) is arranged in the through hole (10) and can move up and down and has two states: an exposed state in which at least the upper part of the air inlet seat (2) is above the panel (1) and the gas outlet (20b) of the air inlet seat (2) is opposite to the air inlet end of the ejector pipe (3); and a folded state in which the air inlet seat (2) passes through the through hole (10) and is hidden below the panel (1). Compared with the prior art, the panel is easy to clean.

Description

Technical Field

[0001] This invention belongs to the field of household kitchenware technology, specifically relating to a gas stove. Background Technology

[0002] In existing gas stoves, for ease of cleaning, the burner is mounted on the top of the panel and can be moved up and down. For example, the invention patent application "Top Air Intake Burner" (application publication number CN110043901A) with application number 201810039155.4 integrates the injector tube, mixing seat and outer ring burner cap into one unit to form a burner cap assembly. The assembly can be placed on the liquid receiving tray and the liquid receiving tray is provided with at least two separately arranged nozzle seats. Each nozzle seat has at least a first nozzle and a second nozzle. When cleaning, simply remove the assembly, leaving only the liquid receiving tray and the nozzle seats and nozzles on the liquid receiving tray, thus facilitating the cleaning of the liquid receiving tray.

[0003] The aforementioned application achieves cleaning of the panel and the liquid tray on the panel by moving the burner, but the nozzle seat is still left on the panel. Cleaning the position of the nozzle seat on the panel is difficult, and if the nozzle is touched during cleaning, there is a risk that foreign objects will enter the nozzle and cause it to become blocked. Summary of the Invention

[0004] The first technical problem to be solved by the present invention is to provide a gas stove with a panel that is easy to clean, in light of the current state of the prior art.

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

[0006] panel;

[0007] An air intake seat has a gas passage, which has a gas inlet for fluid communication with a gas source and a gas outlet for gas output.

[0008] An ejector tube is disposed on the panel;

[0009] Its features are:

[0010] The panel has a through hole that penetrates its own thickness at the position corresponding to the air intake seat. The air intake seat is movably positioned at the through hole and has the following two states:

[0011] In the exposed state, that is, at least the upper part of the air intake seat is above the panel, and at this time, the gas outlet of the air intake seat is opposite to the air inlet end of the ejector tube;

[0012] In the retracted state, the air intake seat passes through the through hole and is hidden under the panel.

[0013] Thus, by providing a through hole on the panel, the air intake seat can be moved up and down at the through hole, and the air intake seat can be moved to the exposed state. At this time, at least the upper part of the air intake seat is located above the panel, and the gas outlet of the air intake seat is opposite to the air inlet end of the injector tube, that is, the air intake seat can normally output gas source to the injector tube; at the same time, the air intake seat can be moved to the retracted state. At this time, the air intake seat passes through the through hole and is hidden under the panel, that is, there is no air intake seat on the panel, which facilitates the cleaning of the panel, and when cleaning, the gas outlet of the air intake seat will not be wiped, thus avoiding the gas outlet from being blocked.

[0014] Preferably, the air intake seat is further provided with a vertical limiting plate, which extends outward from the side of the air intake seat;

[0015] The panel has a limiting hole that penetrates its own thickness at the position corresponding to the limiting plate. The shape of the limiting hole matches the cross-sectional shape of the limiting plate, and the limiting plate can be inserted into the limiting hole in a way that allows it to move up and down.

[0016] In this way, the cooperation between the limiting plate and the limiting hole can limit the vertical movement trajectory of the air intake seat, ensuring that the air intake seat can move up and down.

[0017] Preferably, there are at least two ejector tubes arranged side by side in a horizontal direction;

[0018] The number of gas passages in the air intake is the same as the number of ejector tubes. The gas outlets of each gas passage are arranged at intervals in the horizontal direction and are opposite to the air intake end of the corresponding ejector tube when exposed.

[0019] To avoid interference caused by the ejector tubes competing for air, preferably, the limiting plate is located between two adjacent gas outlets, and the extension direction of the limiting plate is consistent with the orientation of the gas outlets. In this way, the limiting plate can not only limit the up and down movement of the air inlet seat, but also block the flow between two adjacent gas outlets, achieving the following effects: 1. Preventing the ejector tubes from competing for primary air; 2. Increasing the mixing time of gas and air, improving the uniformity of gas-air mixing; 3. Increasing the air velocity at the air inlet end of each ejector tube, resulting in more air mixing with gas in the same time period, thereby increasing the primary air coefficient of the burner and reducing flue gas emissions.

[0020] In the above solution, to prevent foreign objects from entering the through hole, preferably, the air intake seat is provided with an upper cover plate located above the gas outlet, and in the retracted state, the upper cover plate closes the through hole. Thus, in the retracted state, the upper cover plate can close the through hole, preventing foreign objects such as oil, spilled liquid, and cleaning water from falling into the through hole.

[0021] Furthermore, the side of the upper cover plate extends horizontally towards the ejector tube to form an upper baffle that shields the gas outlet. When exposed, the upper baffle improves the ejector performance of the burner and simultaneously prevents overflow from falling, thus avoiding overflow clogging the gas outlet of the intake seat.

[0022] To further improve the primary air ejection performance, preferably, the upper baffle is provided with an upper ventilation hole that penetrates the wall thickness.

[0023] Preferably, the upper vent is strip-shaped and extends in the same direction as the gas outlet, with one end of the upper vent penetrating the edge of the upper baffle.

[0024] Preferably, in the closed state, the upper cover plate is located inside the through hole, and the periphery of the upper cover plate is opposite to, abutting against or adjacent to the edge of the through hole, thereby closing the through hole.

[0025] In the above solution, to prevent foreign objects from entering the through hole, it is also preferable that the air intake seat is provided with a lower cover plate located below the gas outlet, and in the exposed state, the lower cover plate closes the through hole. Thus, in the exposed state, the lower cover plate can close the through hole, preventing foreign objects such as oil, spilled liquid, and cleaning water from falling into the through hole.

[0026] Preferably, the side of the lower cover plate extends horizontally towards the ejector tube, forming a lower baffle protruding below the gas outlet. This lower baffle below the gas outlet improves the smoothness and uniformity of the airflow at the burner cap's flame outlet. Specifically, under the influence of the upper baffle, the entire flow field within the ejector tube exhibits a significant upward shift. For the burner, the airflow itself needs to move upward after reaching the burner base from the ejector tube; therefore, this upward shift shortens the path and increases the airflow rate per unit time. However, the combined effect of the upward shift makes the shift more pronounced. Inside the ejector tube, the airflow impacts the upper wall, creating a separation zone on the lower wall. The lower baffle has the opposite effect; because more air enters above the lower baffle and less below, the entire flow field shifts downward under its influence. After the upward-shifted flow in the base is superimposed, the overall shift is neutralized, resulting in a relatively stable flow within the ejector tube with less downward shift. Therefore, the mixing time is longer, and the uniformity of the fluid outlet is better. This effect is particularly noticeable for the outer ring ejector.

[0027] To further improve the primary air ejection performance, preferably, the lower baffle is provided with a lower ventilation hole that penetrates the wall thickness.

[0028] Preferably, the lower vent is strip-shaped and extends in the same direction as the gas outlet, with one end of the lower vent penetrating the edge of the lower baffle.

[0029] Preferably, in the exposed state, the lower cover plate is located inside the through hole, and the side of the lower cover plate is opposite to, abutting against or adjacent to the edge of the through hole, thereby closing the through hole.

[0030] In the above scheme, preferably, the ejector tube is placed horizontally on the panel, and the edge of the air inlet end of the ejector tube is provided with a vertical insert extending outward along the length direction of the ejector tube. There are two vertical inserts arranged opposite each other on both sides of the air inlet end in the horizontal direction.

[0031] The air intake seat is provided with a socket for inserting the outer edge of the vertical insert.

[0032] In this way, the fit between the socket and the insert ensures that the ejector tube and the air intake seat are stably bound together, and the two can be detached.

[0033] Preferably, the vertical distance between the lower surface of the upper cover plate and the upper edge of the vertical insert is denoted as D1, and the vertical distance between the upper surface of the lower cover plate and the lower edge of the vertical insert is denoted as D2, wherein D1 < D2. Because the final outlet of the gas (i.e., the flame outlet on the burner cap) is located at the top of the entire burner, the ejection capacity of the lower side of the ejector tube is stronger than that of the upper side. In this invention, by designing D1 < D2, the energy loss when the gas transitions from the transverse direction (inside the ejector tube) to the longitudinal direction (in the mixing chamber of the burner) is reduced, thus benefiting the burner's performance, flow rate, and ejection.

[0034] Furthermore, D2 is 11-12 mm, and D1 is 6-10 mm.

[0035] Preferably, there are two ejector tubes, namely an inner ring ejector tube and an outer ring ejector tube. The gas outlet end of the inner ring ejector tube is used to communicate with the inner ring chamber of the burner of the gas stove, and the gas outlet end of the outer ring ejector tube is used to communicate with the outer ring chamber of the burner of the gas stove. The gas inlet end of the inner ring ejector tube and the gas inlet end of the outer ring ejector tube are each provided with two vertical inserts. The distance between the two vertical inserts on the outer ring ejector tube is D3, and the distance between the two vertical inserts on the inner ring ejector tube is D4. The two satisfy the condition: D3 > D4.

[0036] Preferably, D3 is 19-21 mm and D4 is 14.5-16.5 mm.

[0037] In the above-mentioned schemes, preferably, a burner is also included, the internal chamber of which is connected to the gas outlet end of the ejector tube, and the burner and the ejector tube are constrained together and are mounted on the panel in a detachable manner.

[0038] Preferably, the burner and ejector tube are placed together on the panel.

[0039] In the above solutions, to drive the intake seat to move up and down, a driving mechanism is preferably included, the output of which acts on the intake seat to drive it to move up and down. Of course, the intake seat can also be moved up and down manually.

[0040] Preferably, the drive mechanism includes a motor and a lead screw, the lead screw extending vertically, with its lower end connected to the output shaft of the motor;

[0041] The bottom surface of the air intake seat is provided with a threaded hole corresponding to the upper end of the lead screw, and the upper end of the lead screw is inserted into the threaded hole and the two are threadedly connected.

[0042] To ensure that the air intake seat can be moved to the required position, preferably, a sensor and a controller are also included. The sensor is located on the air intake seat and is used to detect the vertical position of the air intake seat. The input terminal of the controller is connected to the sensor, and the output terminal is connected to the drive mechanism.

[0043] In the above embodiments, preferably, it further includes a chassis having a bottom wall and side walls extending upward from the periphery of the bottom wall, wherein the bottom wall and the side walls define an upward-opening cavity, and the panel is placed on the chassis and closes the opening. In this way, in the retracted state, the air intake seat can be retracted into the chassis.

[0044] Compared with the prior art, the advantages of the present invention are as follows: by providing a through hole on the panel, the air intake seat can be moved up and down at the through hole, and the air intake seat can be moved to the exposed state. At this time, at least the upper part of the air intake seat is located on the panel, and the gas outlet of the air intake seat is opposite to the air inlet end of the injector tube, that is, the air intake seat can normally output gas source to the injector tube; at the same time, the air intake seat can be moved to the retracted state. At this time, the air intake seat passes through the through hole and is hidden under the panel, that is, there is no air intake seat on the panel, which facilitates the cleaning of the panel, and when cleaning, the gas outlet of the air intake seat will not be wiped, thereby avoiding the gas outlet from being blocked. Attached Figure Description

[0045] Figure 1 This is a partial structural schematic diagram of an embodiment of the present invention;

[0046] Figure 2 This is a cross-sectional view (the cross-section is a horizontal plane) of an embodiment of the present invention;

[0047] Figure 3 This is a cross-sectional view of an embodiment of the present invention (the cross-section is a vertical plane extending left and right);

[0048] Figure 4 This is a cross-sectional view of an embodiment of the present invention (the cross-section is a vertical plane extending from front to back);

[0049] Figure 5This is an exploded perspective view of an embodiment of the present invention (with the air intake seat exposed).

[0050] Figure 6 This is an exploded perspective view of an embodiment of the present invention (the air intake seat is in a retracted state);

[0051] Figure 7 This is a schematic diagram of the air intake seat in an embodiment of the present invention;

[0052] Figure 8 This is a velocity vector diagram at the gas outlet in an embodiment of the present invention;

[0053] Figure 9 This is a vector diagram showing the velocity at the gas outlet in the comparative example of this invention;

[0054] Figure 10 for Figure 8 and Figure 9 Difference diagram;

[0055] Figure 11 This is a cross-sectional view showing the equal fuel mass fraction at the gas outlet in an embodiment of the present invention;

[0056] Figure 12 This is a cross-sectional view showing that the fuel mass fraction at the gas outlet is equal in the comparative example of this invention;

[0057] Figure 13 for Figure 11 and Figure 12 Difference diagram;

[0058] Figure 14 This is a velocity cloud map according to an embodiment of the present invention;

[0059] Figure 15 This is a velocity contour plot, which is a comparative example of the present invention.

[0060] Figure 16 for Figure 14 and Figure 15 Difference diagram;

[0061] Figure 17 The velocity contour plot and streamline plot are embodiments of the present invention;

[0062] Figure 18 The velocity contour plot and streamline diagram are comparative examples of this invention;

[0063] Figure 19 for Figure 17 and Figure 18 The difference diagram. Detailed Implementation

[0064] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0065] Example:

[0066] like Figures 1-7 As shown, this is a preferred embodiment of a gas stove according to the present invention. The gas stove includes a panel 1, an air inlet seat 2, an injector tube 3, a burner 4, a drive mechanism 5, and a chassis 6.

[0067] The chassis 6 has a bottom wall 61 and side walls 62 extending upward from the periphery of the bottom wall 61, defining an upward-opening cavity between the bottom wall 61 and the side walls 62. The side of the chassis facing the user is called the front side.

[0068] Panel 1 is placed on top of chassis 6 and closes the opening. Panel 1 also has a through hole 10 that extends through its own thickness.

[0069] The burner 4 is connected to the ejector tube 3 and is placed on the panel 1 in front of the through hole 10. There are two ejector tubes 3: an inner ring ejector tube 31 and an outer ring ejector tube 32, which are arranged side by side in the horizontal direction (in this embodiment, the outer ring ejector tube 32 and the inner ring ejector tube 31 are arranged side by side, one on the left and one on the right, and both extend forward and backward). The air inlet end of the inner ring ejector tube 31 faces backward and the air outlet end faces forward, and it is in fluid communication with the inner ring chamber 41 of the burner 4. The air inlet end of the outer ring ejector tube 32 faces backward and the air outlet end faces forward, and it is in fluid communication with the outer ring chamber 42 of the burner 4.

[0070] The intake seat 2 has two gas passages 20 arranged on the left and right sides. Each gas passage 20 extends vertically, with a gas inlet 20a at its lower end for fluid communication with a gas source, and a gas outlet 20b at its upper end for gas output. The intake seat 2 is movably positioned at the through hole 10 and has the following two states:

[0071] In the exposed state, that is, the upper part of the air intake seat 2 is above the panel 1. At this time, the two gas outlets 20b of the air intake seat 2 are respectively opposite to the air intake end of the corresponding ejector tube 3.

[0072] In the retracted state, the air intake seat 2 passes through the through hole 10 and is hidden under the panel 1.

[0073] In this embodiment, to restrict the movement direction of the air intake seat 2 and allow it to move up and down, the air intake seat is provided with a vertical limiting plate 21. The limiting plate 21 extends forward from the front side of the air intake seat 2 and is located between two adjacent gas outlets 20b. A limiting hole 11 is provided on the panel 1 corresponding to the position of the limiting plate 21, penetrating the thickness of the panel itself. The shape of the limiting hole 11 matches the cross-sectional shape of the limiting plate 21, and the limiting plate 21 can be inserted into the limiting hole 11 in a way that allows it to move up and down.

[0074] Meanwhile, an upper cover plate 22 is provided on the air intake seat 2 above the gas outlet 20b. The front side of the upper cover plate 22 extends forward to form an upper baffle 221 that obstructs the gas outlet 20b. The upper baffle 221 has upper vent holes 222 that penetrate the wall thickness. The upper vent holes 222 are strip-shaped that extend back and forth, and their front ends penetrate the edge of the upper baffle 221. There are four upper vent holes 222, which are located in pairs on the left and right sides of the limiting plate 21, and the two vent holes 22 on the same side of the limiting plate are located on the left and right sides of the corresponding gas outlet 20b.

[0075] A lower cover plate 23 is provided on the air intake seat 2 below the gas outlet 20b. The front side of the lower cover plate 23 extends forward to form a lower baffle 231 protruding below the gas outlet 20b. The lower baffle 231 has a lower vent 232 that penetrates the wall thickness. The lower vent 232 is a strip extending back and forth, and its front end penetrates the edge of the lower baffle 231. The number of lower vents 232 is the same as the number of upper vents 222, and they are set corresponding to their respective upper vents 222.

[0076] When the air intake seat 2 is in the closed state, the upper cover 22 is located inside the through hole 10, and the periphery of the upper cover 22 is opposite to, attached to or adjacent to the edge of the through hole 10, thereby closing the through hole 10.

[0077] With the air intake seat 2 exposed, the lower cover plate 23 is located inside the through hole 10, and the side of the lower cover plate 23 is opposite to, abutting against or adjacent to the edge of the through hole 10, thereby closing the through hole 10.

[0078] Meanwhile, to ensure that the air inlet end of the ejector tube remains fixed relative to the air inlet seat 2 during use, in this embodiment, each ejector tube 3 has a rearwardly extending vertical insert 30 at the edge of its air inlet end, and there are two vertical inserts 30 arranged opposite each other on both sides of the air inlet end. The air inlet seat 2 also has insertion holes 24 for inserting the outer edges of the vertical inserts 30. Each insertion hole 24 corresponds one-to-one with the upper vent 222.

[0079] Record the vertical distance between the lower surface of the upper cover plate 22 and the upper edge of the vertical insert 30 as D1, and the vertical distance between the upper surface of the lower cover plate 23 and the lower edge of the vertical insert 30 as D2. D1 is 6-10mm and D2 is 11-12mm. The two satisfy the condition: D1 < D2.

[0080] The distance between the two vertical inserts on the outer ring ejector tube 32 is denoted as D3, and the distance between the two vertical inserts on the inner ring ejector tube 31 is denoted as D4. D3 is 19-21 mm, and D4 is 14.5-16.5 mm. The two satisfy the condition: D3 > D4.

[0081] like Figure 3 ,4 As shown, the aforementioned drive mechanism 5 is located within the chassis 6. The output end of the drive mechanism 5 acts on the air intake seat 2 to drive the air intake seat 2 to move up and down. Specifically, the drive mechanism 5 includes a motor 51 and a lead screw 52. The lead screw 52 extends vertically, and its lower end is connected to the output shaft of the motor 51. The bottom surface of the air intake seat 2 has a threaded hole 25 corresponding to the upper end of the lead screw 52. The upper end of the lead screw 52 is inserted into the threaded hole 25, and the two are threaded together. At the same time, the chassis 6 has two upward-extending guide rods 53, which are located on the left and right sides of the lead screw 52. The bottom surface of the air intake seat 2 has guide holes corresponding to the upper ends of each guide rod 53, so that the upper ends of the guide rods 53 can be inserted into them. Thus, the rotation of the motor 51 can drive the air intake seat 2 to move up and down.

[0082] In order to control the vertical movement distance of the air intake seat 2, this embodiment also includes a sensor and a controller. There are two sets of sensors, both of which are displacement sensors. The first set of sensors is located in the air intake seat 2 and is used to detect the vertical position of the air intake seat 2. The second set of sensors is located in each of the holes 24 of the air intake seat and is used to detect whether the vertical insert 30 on the ejector tube is inserted into the corresponding hole 24. The input end of the controller is connected to the sensor and the output end is connected to the drive mechanism 5.

[0083] Thus, when the burner is needed for cooking, the motor 51 is started, which drives the lead screw 52 to rotate. Positioned by two guide rods 53 and a limiting plate 21, the motor drives the air intake seat 2 to rise to the designated position (i.e., to the exposed state). To ensure the air intake seat 2 is in the correct position before the burner officially starts working, thereby ensuring safety and ejection, a certain logical judgment is made in the stove's electronic control section: the motor 51 stops working if and only if the first set of sensors are all >0 and the second set of sensors is =0, the valve controlling the gas source can be opened, and the burner is ready to work; if the sensors are not simultaneously in the above states, the valve cannot be activated to ensure safety.

[0084] When cleaning is required, motor 51 is activated, driving lead screw 52 to rotate. Positioned by two guide rods 53 and limit plate 21, the air intake seat 2 descends to the designated position (i.e., the retracted state). To ensure the correct position of the air intake seat during cleaning, the cooktop's electronic control system performs a logical check: motor 51 stops operating only when all sensors in the second set are >0 and all sensors in the first set are =0. At this point, the air intake seat 2 is perfectly seated within the chassis 6. Furthermore, for safety, the valve body cannot be activated while motor 51 is running.

[0085] In addition, when folded up, the burner and injector can be lifted up as a whole, and the entire panel is flat, making it easy to clean.

[0086] Comparative example:

[0087] It is basically the same as the embodiment, except that the limiting plate 21 is not present in this comparative example.

[0088] In this embodiment, the limiting plate 21 has the following function:

[0089] 1. As a baffle to prevent interference between the primary air of the inner and outer ring ejector tubes ( Figures 8-10 );

[0090] 2. Increase fuel mixing time to improve fuel mixing uniformity. Figures 11-13 This improves the overall uniformity of the burner and reduces issues such as yellow flame at localized points;

[0091] 3. Increase the inlet air velocity ( Figures 14-16 , Figures 17-19 In the same amount of time, more air mixes with the gas, thereby increasing the primary air coefficient of the burner and reducing flue gas emissions;

[0092] 4. As a positioning structure for raising and lowering the air intake seat.

Claims

1. A gas stove, comprising: Panel (1); The air intake seat (2) has a gas passage (20) having a gas inlet (20a) for fluid communication with a gas source and a gas outlet (20b) for gas output; An ejector tube (3) is disposed on the panel (1); Its features are: The panel (1) has a through hole (10) that penetrates its own thickness at the position corresponding to the air intake seat (2). The air intake seat (2) is movably positioned at the through hole (10) and has the following two states: In the exposed state, that is, at least the upper part of the air intake seat (2) is located above the panel (1), at this time, the gas outlet (20b) of the air intake seat (2) is opposite to the air intake end of the ejector tube (3); In the retracted state, the air intake seat (2) passes through the through hole (10) and is hidden under the panel (1); The air intake seat (2) is also provided with a vertical limiting plate (21), which extends outward from the side of the air intake seat (2); The panel (1) has a limiting hole (11) that penetrates its own thickness at the position corresponding to the limiting plate (21). The shape of the limiting hole (11) matches the cross-sectional shape of the limiting plate (21). The limiting plate (21) can be inserted into the limiting hole (11) in a way that allows it to move up and down.

2. The gas stove according to claim 1, characterized in that: There are at least two ejector tubes (3), arranged side by side in the horizontal direction; The number of gas passages (20) of the air intake seat (2) is the same as the number of ejector tubes (3). The gas outlets (20b) of each gas passage (20) are arranged at intervals in the horizontal direction and are opposite to the air intake end of the corresponding ejector tube (3) in the exposed state.

3. The gas stove according to claim 2, characterized in that: The limiting plate (21) is located between two adjacent gas outlets (20b), and the extension direction of the limiting plate (21) is consistent with the orientation of the gas outlets (20b).

4. The gas stove according to claim 2, characterized in that: The air inlet seat (2) is provided with an upper cover plate (22), which is located above the gas outlet (20b), and in the closed state, the upper cover plate (22) closes the through hole (10).

5. The gas stove according to claim 4, characterized in that: The side of the upper cover plate (22) extends horizontally toward the ejector tube (3) to form an upper awning (221) that covers the gas outlet (20b).

6. The gas stove according to claim 5, characterized in that: The upper eaves (221) are provided with an upper ventilation hole (222) that penetrates the wall thickness.

7. The gas stove according to claim 6, characterized in that: The upper ventilation hole (222) is strip-shaped and extends in the same direction as the gas outlet (20b). One end of the upper ventilation hole (222) passes through the edge of the upper baffle (221).

8. The gas stove according to claim 4, characterized in that: In the closed state, the upper cover plate (22) is located inside the through hole (10), and the periphery of the upper cover plate (22) is opposite to, abutting against or adjacent to the edge of the through hole (10), thereby closing the through hole (10).

9. The gas stove according to claim 4, characterized in that: The air intake seat (2) is provided with a lower cover plate (23) located below the gas outlet (20b), and in the exposed state, the lower cover plate (23) closes the through hole (10).

10. The gas stove according to claim 9, characterized in that: The side of the lower cover plate (23) extends horizontally toward the ejector tube (3) to form a lower lip (231) protruding below the gas outlet (20b).

11. The gas stove according to claim 10, characterized in that: The lower eaves (231) are provided with a lower ventilation hole (232) that penetrates the wall thickness.

12. The gas stove according to claim 11, characterized in that: The lower ventilation hole (232) is strip-shaped and extends in the same direction as the gas outlet (20b). One end of the lower ventilation hole (232) passes through the edge of the lower baffle (231).

13. The gas stove according to claim 9, characterized in that: In the exposed state, the lower cover plate (23) is located inside the through hole (10), and the side of the lower cover plate (23) is opposite to, abutting against or adjacent to the edge of the through hole (10), thereby closing the through hole (10).

14. The gas stove according to claim 9, characterized in that: The ejector tube (3) is placed horizontally on the panel (1), and the edge of the air inlet end of the ejector tube (3) is provided with a vertical insert (30) extending outward along the length direction of the ejector tube (3). There are two vertical inserts (30) arranged opposite each other on both sides of the air inlet end in the horizontal direction. The air intake seat (2) is provided with an insertion hole (24) for inserting the outer side of the vertical insert (30).

15. The gas stove according to claim 14, characterized in that: Let D1 be the vertical distance between the lower surface of the upper cover plate (22) and the upper edge of the vertical insert (30), and let D2 be the vertical distance between the upper surface of the lower cover plate (23) and the lower edge of the vertical insert (30). The two satisfy the condition: D1 < D2.

16. The gas stove according to claim 15, characterized in that: The D2 is 11~12mm, and the D1 is 6~10mm.

17. The gas stove according to claim 14, characterized in that: There are two ejector tubes (3), namely an inner ring ejector tube (31) and an outer ring ejector tube (32). The gas outlet of the inner ring ejector tube (31) is used to communicate with the inner ring chamber (41) of the burner (4) of the gas stove. The gas outlet of the outer ring ejector tube (32) is used to communicate with the outer ring chamber (42) of the burner (4) of the gas stove. The gas inlet of the inner ring ejector tube (31) and the gas inlet of the outer ring ejector tube (32) are each provided with two vertical inserts (30). The distance between the two vertical inserts (30) on the outer ring ejector tube (32) is D3, and the distance between the two vertical inserts (30) on the inner ring ejector tube (31) is D4. The two satisfy: D3 > D4.

18. The gas stove according to claim 17, characterized in that: The D3 is 19~21mm, and the D4 is 14.5~16.5mm.

19. The gas stove according to any one of claims 1 to 18, characterized in that: It also includes a burner (4), whose internal chamber is connected to the gas outlet of the ejector tube (3), and the burner (4) and the ejector tube (3) are constrained together and are mounted on the panel (1) in a detachable manner.

20. The gas stove according to claim 19, characterized in that: The burner (4) and ejector tube (3) are placed together on the panel (1).

21. The gas stove according to any one of claims 1 to 18, characterized in that: It also includes a drive mechanism (5), whose output end acts on the air intake seat (2) to drive the air intake seat (2) to move up and down.

22. The gas stove according to claim 21, characterized in that: The drive mechanism (5) includes a motor (51) and a lead screw (52). The lead screw (52) extends vertically, and its lower end is connected to the output shaft of the motor (51). The bottom surface of the air intake seat (2) is provided with a threaded hole (25) corresponding to the upper end of the lead screw (52). The upper end of the lead screw (52) is inserted into the threaded hole (25) and the two are threadedly connected.

23. The gas stove according to claim 21, characterized in that: It also includes a sensor and a controller. The sensor is located on the air intake seat (2) and is used to detect the position of the air intake seat (2) in the vertical direction. The input end of the controller is connected to the sensor, and the output end is connected to the drive mechanism (5).

24. The gas stove according to any one of claims 1 to 18, characterized in that: It also includes a chassis (6) having a bottom wall (61) and side walls (62) extending upward from the periphery of the bottom wall (61), wherein the bottom wall (61) and the side walls (62) define an upward-opening cavity, and the panel (1) covers the chassis (6) and closes the opening.

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