Section valve and stove comprising same

Abstract

The utility model provides a section valve and a stove comprising the same. The section valve is used for supplying fuel gas and comprises a first annular gas inlet channel, the first annular gas inlet channel comprises a first annular gas inlet tail section, and the outlet end of the first annular gas inlet tail section is connected to the outside; the outlet end section of the first ring air inlet tail section is a first section, the middle section of the first ring air inlet tail section is a second section, and the air inlet end section of the first ring air inlet tail section is a third section; from the third section to the second section, the sectional area of the first ring gas inlet tail section is gradually reduced, so that gas is accelerated to stabilize flow; the sectional area of the first ring air inlet tail section is gradually increased from the second section to the first section; therefore, the fuel gas is diffused and is output to the outside at reasonable pressure; the sectional area of the first ring air inlet tail section is gradually changed, and flow separation of the valve element is reduced.

Description

Technical Field

[0001] The utility model relates to the field of stoves, in particular to a stage valve and a stove comprising the same. Background Art

[0002] As users demand ever-increasing heat output, stove designs are trending toward ultra-high power (5.2kW) and precise control. Consequently, stage valves are widely used in stoves with ultra-high power. However, existing stage valve core structures exhibit numerous flow separation zones, resulting in significant localized pressure loss and a reduction in total flow. This makes high-power flow interception more likely than conventional valves, leading to insufficient maximum flow and, consequently, insufficient heat output, thus failing to meet user demands. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the local pressure loss of the sectional valve is large, resulting in insufficient firepower of the stove, and provide a sectional valve and a stove including the same.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A section valve for supplying gas, comprising a first ring air inlet passage, the first ring air inlet passage comprising a first ring air inlet middle section and a first ring air inlet tail section, wherein an outlet end of the first ring air inlet tail section is connected to the outside;

[0006] The cross section of the outlet end of the first ring air inlet tail section is defined as the first cross section, the cross section of the middle portion of the first ring air inlet tail section is defined as the second cross section, and the cross section of the connection between the first ring air inlet middle section and the first ring air inlet tail section is defined as the third cross section.

[0007] From the third section to the second section, the cross-sectional area of the first ring air intake tail section gradually decreases, and from the second section to the first section, the cross-sectional area of the first ring air intake tail section gradually increases.

[0008] In the present technical solution, by providing the section valve, after the gas flow path turns, the cross-sectional area of the first ring air intake tail section gradually decreases from the third section to the second section, so that the gas accelerates and stabilizes the flow. Since the first ring air intake tail section is usually longer, this setting effectively reduces the local pressure loss of the gas in the flow of the first ring air intake tail section, increases the gas flow rate, and stabilizes the gas flow rate; from the second section to the first section, the cross-sectional area of the first ring air intake tail section gradually increases, so that the gas is expanded and output to the outside at a reasonable pressure; the cross-sectional area of the entire first ring air intake tail section is gradual, without sudden changes, reducing the flow separation of the valve core.

[0009] Preferably, the first ring air inlet passage further comprises a first ring air inlet middle section, the first ring air inlet middle section is connected to an end of the first ring air inlet tail section away from the outside, and a junction between the first ring air inlet middle section and the first ring air inlet tail section has a turning point;

[0010] Assume that the cross-section of the middle section of the first ring air intake is a fourth cross-section, the cross-sectional area of the fourth cross-section is smaller than the cross-sectional area of the third cross-sectional area, and the cross-sectional area of the third cross-sectional area is equal to the cross-sectional area of the first cross-sectional area.

[0011] In the present technical solution, by setting the cross-sectional area of the fourth section to be smaller than that of the third section, local separation of the gas is reduced when flowing in the middle section of the first ring air intake, and part of the static pressure is compensated; by setting the cross-sectional area of the third section to be equal to the cross-sectional area of the first section, the gas can be expanded to a degree that can be output to the outside at a reasonable pressure before the turning point at the connection between the middle section of the first ring air intake and the tail section of the first ring air intake, thereby reducing the flow loss at the turning point.

[0012] Preferably, the section valve further includes an air outlet channel, and the first ring air inlet channel further includes a first ring air inlet initial section, the first ring air inlet initial section connecting an end of the first ring air inlet middle section away from the first ring air inlet tail section and the air outlet channel, and a junction between the first ring air inlet initial section and the first ring air inlet middle section has a turning point;

[0013] Assume that the cross section of the first ring air intake initial section is the fifth cross section, and the cross-sectional area of the fifth cross section is smaller than the cross-sectional area of the fourth cross section.

[0014] In this technical solution, by setting the cross-sectional area of the fifth section to be smaller than the cross-sectional area of the fourth section, the gas flow rate in the initial section of the first ring air intake can be made faster, and the gas flow rate can be further stabilized.

[0015] Preferably, the ratio of the cross-sectional area of the fifth cross-section to the cross-sectional area of the fourth cross-section is in the range of 0.5-1; and / or,

[0016] The ratio of the cross-sectional area of the second cross-section to the cross-sectional area of the first cross-section is in the range of 1.2-2; and / or,

[0017] The angle between the tube walls on both sides of the first section is in the range of 1.5°-3°; and / or,

[0018] The ratio of the cross-sectional area of the fourth cross-section to the cross-sectional area of the third cross-section is in the range of 0.5-1.

[0019] In this technical solution, by setting the ratio of the cross-sectional area of the fifth section to that of the fourth section within a range of 0.5-1, the gas flow rate in the initial and middle sections of the first ring intake can be more appropriately varied, resulting in a faster gas flow rate in the initial section, further stabilizing the gas flow rate, and avoiding excessively sudden changes in cross-sectional area. By setting the ratio of the cross-sectional area of the second section to that of the first section within a range of 1.2-2, and / or the angle between the two side walls of the first section within a range of 1.5°-3°, the gas flow rate in the final section of the first ring intake can be more appropriately varied, further increasing the gas flow rate, stabilizing the gas flow rate, and delivering it to the outside at a reasonable pressure. By setting the ratio of the cross-sectional area of the fourth section to that of the third section within a range of 0.5-1, the gas flow rate in the middle and final sections of the first ring intake can be more appropriately varied, reducing flow losses at the turning point.

[0020] Preferably, the axis of the middle section of the air inlet of the first ring is perpendicular to the axis of the air outlet channel;

[0021] The axis of the initial section of the first ring air intake and the axis of the air outlet channel form a first angle of the first ring, and the axis of the initial section of the first ring air intake and the axis of the middle section of the first ring air intake form a second angle of the first ring. The size ranges of the first angle of the first ring and the second angle of the first ring are both greater than 90° and less than 180°.

[0022] In the present technical solution, by setting the axis of the middle section of the air inlet of the first ring and the axis of the air outlet channel to be perpendicular, the transition of the gas from vertical injection to horizontal output can be achieved with a relatively simple structure; by setting the size range of the first bend angle of the first ring and the second bend angle of the first ring to be greater than 90° and less than 180°, the turns through which the air flow passes can all be obtuse-angle channels, avoiding the gas flow loss caused by right-angle and sharp-angle turns, and making the valve core have no obvious flow separation.

[0023] Preferably, the section valve further comprises a second ring air inlet channel, the second ring air inlet channel comprises a second ring air inlet initial section, and one end of the second ring air inlet initial section is connected to the air outlet channel;

[0024] The axis of the initial section of the first ring air intake and the axis of the air outlet channel form the first angle of the first ring, the axis of the initial section of the second ring air intake and the axis of the air outlet channel form the first angle of the second ring, and the size of the first angle of the first ring is not equal to the size of the first angle of the second ring.

[0025] In the present technical solution, by setting the size of the first bend angle of the first ring to be different from the size of the first bend angle of the second ring, since the larger the angle, the larger the flow resistance coefficient, the smaller the flow loss, the flow loss of the first ring air inlet channel and the second ring air inlet channel can be made different to adapt to their corresponding different flow levels.

[0026] Preferably, the second ring air inlet passage comprises a second ring air inlet middle section and a second ring air inlet tail section, wherein the outlet end of the second ring air inlet tail section is connected to the outside world, the second ring air inlet middle section is connected to an end of the second ring air inlet tail section away from the outside world, and the connection between the second ring air inlet middle section and the second ring air inlet tail section has a turning point;

[0027] The axis of the first ring air intake middle section, the axis of the first ring air intake tail section, the axis of the second ring air intake middle section, and the axis of the second ring air intake tail section are all located on a first plane, and the outlet end of the first ring air intake tail section and the outlet end of the second ring air intake tail section are located on a second plane perpendicular to the first plane.

[0028] In the present technical solution, by arranging the first ring air intake middle section, the first ring air intake tail section, the second ring air intake middle section, and the second ring air intake tail section to be located on the first plane, the overall flow channel setting of the section valve can be made simple; the outlet end of the first ring air intake tail section and the outlet end of the second ring air intake tail section are arranged on a second plane perpendicular to the first plane, so that there is no need to add additional copper air pipes to connect the nozzles, reducing the air flow stroke, reducing the pressure loss along the stroke, increasing the air flow velocity, and satisfying the flow rate. At the same time, the induced capacity is enhanced, which can accelerate the heat dissipation at the nozzle, prevent the air flow from overheating and expansion, and further avoid the reduction of flow rate.

[0029] A cooker comprises the above-mentioned stage valve.

[0030] In this technical solution, by providing the stove, the gas flow rate can be stabilized and the user experience can be improved.

[0031] Preferably, the cooker further comprises a nozzle, and the outlet end of the first ring air intake tail section is directly connected to the nozzle.

[0032] In the present technical solution, by arranging the cooker to also include a nozzle, the outlet end of the first ring air intake tail section is directly connected to the nozzle, which can reduce the airflow stroke, reduce the pressure loss along the stroke, increase the airflow velocity, and meet the flow rate. At the same time, the induced ejection capacity is enhanced, which can accelerate the heat dissipation at the nozzle, prevent the airflow from overheating and expansion, and further avoid the reduction of the flow rate.

[0033] Preferably, the stove further comprises a burner base, and the nozzle and the burner base are directly plug-connected.

[0034] In the present technical solution, the above-mentioned arrangement eliminates the need for a nozzle holder, thereby reducing the heat conduction effect caused by the contact between the nozzle and the burner base, thereby lowering the temperature of the nozzle.

[0035] The positive progress effect of this utility model is:

[0036] In this technical solution, by providing this stage valve, after the gas flow path turns, the cross-sectional area of the first ring intake tail section gradually decreases from the third section to the second section, accelerating and stabilizing the gas flow. Since the first ring intake tail section is typically longer, this configuration effectively reduces local pressure loss of the gas flowing in the first ring intake tail section, increasing the gas flow velocity and stabilizing the gas flow rate. From the second section to the first section, the cross-sectional area of the first ring intake tail section gradually increases, allowing the gas to expand and be output to the outside at a reasonable pressure. The cross-sectional area of the entire first ring intake tail section changes gradually, without sudden changes, reducing flow separation in the valve core. By providing this stove, the gas flow rate can be stabilized and the user experience can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the longitudinal cross-section structure of the first ring air inlet channel of the section valve according to one embodiment of the present utility model.

[0038] Figure 2 This is a schematic diagram of the longitudinal cross-section structure of the second ring air inlet channel of the section valve according to one embodiment of the present utility model.

[0039] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the third ring air inlet channel section of the sectional valve according to one embodiment of the present utility model.

[0040] Figure 4 This is a schematic diagram of the cross-sectional structure of a section valve at a first plane according to an embodiment of the present utility model.

[0041] Figure 5 This is a schematic diagram of the assembly structure of the stage valve and the burner base according to one embodiment of the present utility model.

[0042] Figure 6 This is a schematic diagram of the assembly structure of the stage valve and the burner base from another perspective of an embodiment of the present utility model.

[0043] Description of reference numerals:

[0044] First ring air intake tail section 11

[0045] First section 111

[0046] Second section 112

[0047] The third section 113

[0048] First ring intake middle section 12

[0049] Fourth section 121

[0050] First ring intake section 13

[0051] Fifth section 131

[0052] Second ring air intake tail section 21

[0053] Second ring air intake middle section 22

[0054] Second ring air intake initial section 23

[0055] The third ring air intake tail section 31

[0056] The third ring intake initial section 33

[0057] Exhaust channel 4

[0058] Nozzle 5

[0059] Burner base 6 DETAILED DESCRIPTION

[0060] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0061] like Figure 1-Figure 4 As shown, this embodiment provides a section valve for supplying gas, the section valve includes a first ring air inlet channel, the first ring air inlet channel includes a first ring air inlet tail section 11, and the outlet end of the first ring air inlet tail section 11 is connected to the outside.

[0062] The outlet cross-section of the first ring air intake tail section 11 is a first cross-section 111 , the middle cross-section of the first ring air intake tail section 11 is a second cross-section 112 , and the inlet cross-section of the first ring air intake middle section 12 is a third cross-section 113 .

[0063] After the gas flow path turns, the cross-sectional area of the first ring air intake tail section 11 in this section gradually decreases from the larger third section 113 to the smaller second section 112, so that the gas accelerates and stabilizes the flow. Since the first ring air intake tail section 11 is usually longer, this setting effectively reduces the local pressure loss of the gas flowing in the first ring air intake tail section 11, increases the gas flow speed, and stabilizes the gas flow rate; from the smaller second section 112 to the larger first section 111, the cross-sectional area of the first ring air intake tail section 11 in this section gradually increases, so that the gas is expanded and output to the outside at a reasonable pressure; the cross-sectional area of the entire first ring air intake tail section 11 is gradual, without sudden changes, reducing the flow separation of the valve core.

[0064] In this embodiment, the first ring air intake channel also includes a first ring air intake middle section 12, which is connected to the end of the first ring air intake tail section 11 away from the outside world, and the connection between the first ring air intake middle section 12 and the first ring air intake tail section 11 has a turning point.

[0065] The cross-section of the first-ring intake middle section 12 is defined as fourth cross-section 121. The cross-sectional area of fourth cross-section 121 is smaller than that of third cross-section 113. This reduces local separation of the gas flowing through the first-ring intake middle section 12 and compensates for some static pressure. The cross-sectional area of third cross-section 113 is equal to that of first cross-section 111, meaning that the cross-sectional areas of the first-ring intake tail section 11 remain unchanged. This ensures that the gas is expanded to a level that allows it to be discharged to the outside at a reasonable pressure before the transition between the first-ring intake middle section 12 and the first-ring intake tail section 11, thus reducing flow losses at the transition.

[0066] In this embodiment, the stage valve further includes an air outlet channel 4, and the first ring air inlet channel further includes a first ring air inlet initial section 13. The first ring air inlet initial section 13 connects an end of the first ring air inlet middle section 12 away from the first ring air inlet tail section 11 and the air outlet channel 4. The connection between the first ring air inlet initial section 13 and the first ring air inlet middle section 12 has a turning point.

[0067] The cross section of the first ring air intake section 13 is set as the fifth cross section 131, and the cross-sectional area of the fifth cross section 131 is smaller than the cross-sectional area of the fourth cross section 121. In this way, the gas flow rate in the first ring air intake section 13 can be made faster, and the gas flow rate can be further stabilized.

[0068] In this embodiment, the ratio of the cross-sectional area of the fifth section 131 to the cross-sectional area of the fourth section 121 is 0.5. This allows for more reasonable variations in the gas flow rate within the first-ring initial air intake section 13 and the first-ring middle air intake section 12, resulting in a faster gas flow rate within the first-ring initial air intake section 13, further stabilizing the gas flow rate while avoiding excessively sudden changes in cross-sectional area. Of course, in other embodiments, the ratio of the cross-sectional area of the fifth section to the cross-sectional area of the fourth section may also take other values within the range of 0.5-1.

[0069] In this embodiment, the ratio of the cross-sectional area of the second section 112 to the cross-sectional area of the first section 111 is 1.4. This allows for a more reasonable variation in the gas flow rate within the first ring intake tail section 11, further increasing the gas flow rate and stabilizing the gas flow rate while simultaneously delivering the gas to the outside at a reasonable pressure. Of course, in other embodiments, the ratio of the cross-sectional area of the second section to the cross-sectional area of the first section can also be set to other values within the range of 1.2-2, or the expansion angle of the first section (i.e., the angle between the two side walls at the first section) can be set within the range of 1.5°-3° to achieve similar effects.

[0070] In this embodiment, the ratio of the cross-sectional area of the fourth section 121 to the cross-sectional area of the third section 113 is 0.5. This ensures a more reasonable change in the gas flow rate in the first-ring intake middle section 12 and the first-ring intake tail section 11, thereby reducing flow losses at the turning points. Of course, in other embodiments, the ratio of the cross-sectional area of the fourth section to the cross-sectional area of the third section may also take other values within the range of 0.5-1.

[0071] In this embodiment, the axis of the first ring air inlet middle section 12 is perpendicular to the axis of the air outlet channel 4, and a relatively simple structure can be used to realize the transformation of the gas from vertical injection to horizontal output (usually in actual use, the air outlet channel 4 is vertically arranged).

[0072] The axis of the first ring's initial air intake section 13 forms a first angle α1 with the axis of the air outlet passage 4. The axis of the first ring's initial air intake section 13 forms a second angle α2 with the axis of the first ring's middle air intake section 12. α1 = 150°, and α2 = 120°. This ensures that all turns through which the airflow passes are obtuse-angled channels, avoiding gas flow losses caused by right-angle or sharp-angle turns and ensuring no significant flow separation within the valve core. Of course, in other embodiments, the first and second angles of the first ring can also take other values within a range greater than 90° and less than 180°.

[0073] In this embodiment, the sectional valve further includes a second-ring air inlet channel, which includes a second-ring air inlet initial section 23. One end of the second-ring air inlet initial section 23 is connected to the air outlet channel 4. The axis of the second-ring air inlet initial section 23 and the axis of the air outlet channel 4 form a second-ring first angle β1, where α1 ≠ β1. Since a larger angle increases the flow resistance coefficient and reduces flow loss, this allows the first-ring air inlet channel and the second-ring air inlet channel to have different flow losses, adapting to their respective flow levels.

[0074] Please refer back to Figure 3 In this embodiment, the second ring air intake channel includes a second ring air intake middle section 22 and a second ring air intake tail section 21. The outlet end of the second ring air intake tail section 21 is connected to the outside world, and the second ring air intake middle section 22 is connected to the end of the second ring air intake tail section 21 away from the outside world. The connection between the second ring air intake middle section 22 and the second ring air intake tail section 21 has a turning point.

[0075] The axis of the first ring air intake middle section 12, the axis of the first ring air intake tail section 11, the axis of the second ring air intake middle section 22, and the axis of the second ring air intake tail section 21 are all located on the first plane, which can make the overall flow channel setting of the section valve simple.

[0076] The outlet end of the first ring air intake tail section 11 and the outlet end of the second ring air intake tail section 21 are located on a second plane perpendicular to the first plane, so that there is no need to add additional copper air pipes to connect the nozzles 5, which reduces the air flow stroke, reduces the pressure loss along the way, increases the air flow speed, and satisfies the flow rate. At the same time, the induced capacity is enhanced, which can accelerate the heat dissipation at the nozzle 5, prevent the air flow from overheating and expansion, and further avoid the reduction of flow rate.

[0077] In this embodiment, a similar structural arrangement also appears on the third-ring air intake channel, the axis of the third-ring air intake tail section 31 is also located on the first plane, and the outlet end of the third-ring air intake tail section 31 is also located on the second plane, achieving a similar effect; of course, in other embodiments, other air intake channels can be further provided to adapt to the needs of stoves with more loops.

[0078] This embodiment also provides a stove, which includes the above-mentioned stage valve, so as to stabilize the gas flow and improve the user experience.

[0079] In this embodiment, the stage valve also includes a third-ring air inlet channel. This channel includes a primary third-ring air inlet section 33, one end of which is connected to the outlet channel 4. The axis of the primary third-ring air inlet section 33 forms a first third-ring angle γ1 with the axis of the outlet channel 4, where 0° ≤ (180° - β1) ≤ (180° - α1) ≤ (180° - γ1) ≤ 90°. Due to the need to transition from vertical gas injection to horizontal gas output, significant "secondary flow" mixing losses occur during the gas separation process. The greater the angle between the separation direction and the central axis (i.e., the complementary angle of each primary angle), the greater the shear loss. Furthermore, it is important to maintain an acute angle between the separation direction and the central axis.

[0080] In this embodiment, combined with the aforementioned arrangement that the axes of the respective intake tail sections lie on the first plane, it is readily apparent that the larger the first bending angle, the lower the connection ends of the corresponding intake initial sections on the outlet channel 4. Specifically, since 180° ≥ β1 ≥ α1 ≥ γ1 ≥ 90°, the connection ends on the outlet channel 4, from bottom to top, are: the second ring intake channel, the first ring intake channel, and the third ring intake channel.

[0081] Furthermore, the stove's combustion section includes an inner combustion ring, a middle combustion ring, and an outer combustion ring (not shown). The properties of the gas outlet channel 4 (i.e., the gas channel at the valve core closure) must be considered. Because the valve core closure has greater momentum near the lower end and limited space, large orifices cannot be placed, as this would cause total pressure loss and affect flow at the upper end. Multiple flow levels cannot be arranged due to insufficient space. Therefore, a few small flow levels are placed at the lower end for the outer ring. The maximum flow rate is located in the center of the valve core closure, supplying gas to the burner's middle ring. Firstly, because the gas channel at the lower end is closed over a wide range of angles, the total gas pressure in the middle is maintained, minimizing flow losses. Secondly, the middle ring has more flow levels than the outer ring, but fewer than the inner ring, making its placement in the center of the valve core closure more appropriate. The upper end of the valve core closure controls the flow rate of the burner's inner ring. Unlike other circuits, the burner's inner ring also needs to be used for ignition and flame maintenance, requiring constant ventilation. Therefore, orifices are required throughout the entire valve body opening angle range, as this ring has the most flow levels. Since the inner ring needs to be normally open, setting it at the upper end can reduce its impact on the pressure loss of other gas paths; and the inner ring has many flow levels. According to the structural characteristics of the valve core cone, the upper end has the largest space, which is suitable for the layout of the inner ring.

[0082] Therefore, this embodiment has the following configuration: the second ring air inlet channel corresponds to the outer combustion ring and has 1-2 flow levels; the first ring air inlet channel corresponds to the middle combustion ring and has 5-7 flow levels; the third ring air inlet channel corresponds to the inner combustion ring and has 8-10 flow levels. This can better adapt to user needs.

[0083] In this embodiment, the cooker further includes a nozzle 5, to which the outlet end of the first ring air intake tail section 11 is directly connected. This shortens the airflow path, reduces pressure loss along the way, increases airflow velocity, and satisfies flow requirements. Simultaneously, the enhanced ejection capacity accelerates heat dissipation at the nozzle 5, prevents overheating and expansion of the airflow, and further avoids flow reduction.

[0084] like Figure 5 、 Figure 6 As shown, in this embodiment, the stove further includes a burner base 6, and the nozzle 5 is directly connected to the burner base 6. In this way, the nozzle base can be omitted, thereby reducing the heat conduction effect caused by the contact between the nozzle 5 and the burner base 6, thereby reducing the temperature of the nozzle 5.

[0085] Although specific embodiments of the present invention have been described above, those skilled in the art will appreciate that these are merely illustrative and that the scope of protection of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, and such changes and modifications are intended to fall within the scope of protection of the present invention.

Claims

1. A section valve for supplying gas, comprising a first ring air inlet channel, characterized in that: The first ring air inlet passage comprises a first ring air inlet middle section and a first ring air inlet tail section, and the outlet end of the first ring air inlet tail section is connected to the outside; The cross section of the outlet end of the first ring air inlet tail section is defined as the first cross section, the cross section of the middle portion of the first ring air inlet tail section is defined as the second cross section, and the cross section of the connection between the first ring air inlet middle section and the first ring air inlet tail section is defined as the third cross section. From the third section to the second section, the cross-sectional area of the first ring air intake tail section gradually decreases, and from the second section to the first section, the cross-sectional area of the first ring air intake tail section gradually increases.

2. The sectional valve according to claim 1, characterized in that: The first ring air inlet passage also includes a first ring air inlet middle section, the first ring air inlet middle section is connected to the end of the first ring air inlet tail section away from the outside, and the connection between the first ring air inlet middle section and the first ring air inlet tail section has a turn; Assume that the cross-section of the middle section of the first ring air intake is a fourth cross-section, the cross-sectional area of the fourth cross-section is smaller than the cross-sectional area of the third cross-sectional area, and the cross-sectional area of the third cross-sectional area is equal to the cross-sectional area of the first cross-sectional area.

3. The sectional valve according to claim 2, characterized in that: The section valve further includes an air outlet channel, and the first ring air inlet channel further includes a first ring air inlet initial section, the first ring air inlet initial section connecting an end of the first ring air inlet middle section away from the first ring air inlet tail section and the air outlet channel, and a junction between the first ring air inlet initial section and the first ring air inlet middle section has a turning point; Assume that the cross section of the first ring air intake initial section is the fifth cross section, and the cross-sectional area of the fifth cross section is smaller than the cross-sectional area of the fourth cross section.

4. The sectional valve according to claim 3, characterized in that: The ratio of the cross-sectional area of the fifth cross-section to the cross-sectional area of the fourth cross-section is in the range of 0.5-1; and / or, The ratio of the cross-sectional area of the second cross-section to the cross-sectional area of the first cross-section is in the range of 1.2-2; and / or, The angle between the tube walls on both sides of the first section is in the range of 1.5°-3°; and / or, The ratio of the cross-sectional area of the fourth cross-section to the cross-sectional area of the third cross-section is in the range of 0.5-1.

5. The sectional valve according to claim 3, characterized in that: The axis of the middle section of the air inlet of the first ring is perpendicular to the axis of the air outlet channel; The axis of the initial section of the first ring air intake and the axis of the air outlet channel form a first angle of the first ring, and the axis of the initial section of the first ring air intake and the axis of the middle section of the first ring air intake form a second angle of the first ring. The size ranges of the first angle of the first ring and the second angle of the first ring are both greater than 90° and less than 180°.

6. The sectional valve according to claim 3, characterized in that: The section valve further includes a second ring air inlet channel, the second ring air inlet channel includes a second ring air inlet initial section, and one end of the second ring air inlet initial section is connected to the air outlet channel; The axis of the initial section of the first ring air intake and the axis of the air outlet channel form the first angle of the first ring, the axis of the initial section of the second ring air intake and the axis of the air outlet channel form the first angle of the second ring, and the size of the first angle of the first ring is not equal to the size of the first angle of the second ring.

7. The sectional valve according to claim 6, characterized in that: The second ring air inlet passage includes a second ring air inlet middle section and a second ring air inlet tail section, wherein the outlet end of the second ring air inlet tail section is connected to the outside world, the second ring air inlet middle section is connected to an end of the second ring air inlet tail section away from the outside world, and the connection between the second ring air inlet middle section and the second ring air inlet tail section has a turning point; The axis of the first ring air intake middle section, the axis of the first ring air intake tail section, the axis of the second ring air intake middle section, and the axis of the second ring air intake tail section are all located on a first plane, and the outlet end of the first ring air intake tail section and the outlet end of the second ring air intake tail section are located on a second plane perpendicular to the first plane.

8. A stove, characterized in that: It comprises the segment valve according to any one of claims 1 to 7.

9. The cooker according to claim 8, characterized in that: The cooker further includes a nozzle, and the outlet end of the first ring air intake tail section is directly connected to the nozzle.

10. The cooker according to claim 9, characterized in that: The stove also includes a burner base, and the nozzle is directly plugged into the burner base.

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