An ejector assembly, an ejector system and a gas cooker of a burner

Abstract

An ejector assembly of a burner, comprising an ejector pipe and an air inlet seat. The ejector pipe has an air inlet, and the air inlet has a central region and a peripheral region located around the central region. The air inlet seat is located upstream of the air inlet of the ejector pipe and has a gas passage and a blast air passage. It further includes a guide pipe disposed in the ejector pipe and extending along a first axial direction. The interior of the guide pipe is hollow to form a first chamber, and the inlet of the first chamber corresponds to the central region of the above-mentioned air inlet. The outer peripheral wall of the guide pipe and the inner peripheral wall of the ejector pipe face each other to form an annular second chamber, and the inlet of the second chamber corresponds to the peripheral region of the above-mentioned air inlet. At the same time, a plurality of through holes penetrating the wall thickness are distributed at intervals on the peripheral wall of the guide pipe, so that the blast air in the second chamber can pass through the through holes and enter the first chamber. The present invention also discloses an ejector system and a gas cooker having the above-mentioned ejector assembly. Compared with the prior art, the present invention can reduce the resistance of the inner wall of the ejector pipe to the gas.

Description

Technical Field

[0001] The present invention belongs to the technical field of household cooking utensils, and particularly relates to an ejector assembly, an ejection system of a burner, and a gas cooker. Background Art

[0002] In existing gas cookers, in order to increase the supply amount of primary air so that the gas can burn more completely, people have designed a blower-type burner. For example, the structure disclosed in the utility model patent "An ejector-type blower burner for a gas cooker" with the patent number ZL200720088825.9 (the authorized announcement number is CN201166369Y) includes an ejector, a gas connection pipe, a gas nozzle, a combustion chamber, a flame stabilizing hole assembly, an air chamber, and an axial flow fan. A circle of secondary air ports is provided at the bottom edge of the combustion chamber. The flame stabilizing hole assemblies are evenly distributed at the bottom of the combustion chamber. The bottom of the flame hole assembly is communicated with the head of the ejector. The tail of the ejector is connected to the axial flow fan through the air chamber. The gas nozzle is connected to the gas connection pipe and fixed in the center of the air chamber.

[0003] The existing ejector assembly has the following technical problems:

[0004] First, during the flow of gas in the ejector tube, there is a certain resistance to the gas on the inner wall of the ejector tube.

[0005] Second, the blower air and the gas enter the ejector tube together through the air inlet of the ejector tube. During this process, there is a problem of mutual interference between the blower air and the gas.

[0006] Third, since the gas nozzle is located in the center of the air chamber, the air flow blown out from the air chamber will surround the gas nozzle in a circle. Therefore, the air introduced by the blower device will form a "wind curtain" that blows the air near the air inlet of the ejector tube outward, which will affect the ability of the gas nozzle to eject natural air during injection.

[0007] Fourth, the gas ejected from the gas nozzle and the air are not evenly mixed in the ejector tube. For example, when the burner is working, the air in the stove shell is heated, resulting in a relatively high ambient temperature, and the temperature increases more significantly closer to the burner. When it is at a high temperature, the gas ejected from the gas nozzle is quickly heated, the volume rapidly increases, the density decreases, and the influence of buoyancy on the gas ejection direction cannot be ignored. The trajectory line of the gas ejection will have a certain upward inclination, making the mixing of air and gas in the ejector tube uneven. Summary of the Invention

[0008] The first technical problem to be solved by the present invention is to provide an ejector assembly of a burner according to the current situation of the prior art to reduce the resistance of the inner wall of the ejector tube to the gas.

[0009] The second technical problem to be solved by the present invention is to provide an ejector assembly for a burner to reduce the risk of interference between the blast air and the gas.

[0010] The third technical problem to be solved by the present invention is to provide an ejector assembly for a burner to avoid the blast air affecting the natural ejection.

[0011] The fourth technical problem to be solved by the present invention is to provide an ejection system having the above-mentioned ejector assembly.

[0012] The fifth technical problem to be solved by the present invention is to provide a gas stove having the above-mentioned ejection system.

[0013] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is as follows: An ejector assembly for a burner includes:

[0014] An ejector tube having an air inlet, the air inlet having a central region and a peripheral region surrounding the central region, and the length direction of the ejector tube is defined as the first axial direction, and the direction around the first axial direction is the first circumferential direction;

[0015] An air inlet seat having a gas passage and a blast air passage, wherein the gas inlet of the gas passage is used to be in fluid communication with a gas source, and the air inlet of the blast air passage is used to be in fluid communication with a blast air source;

[0016] Along the gas flow direction, the air inlet seat is located upstream of the air inlet of the ejector tube, and the gas outlet of the gas passage is opposite to the central region of the air inlet, and the air outlet of the blast air passage is located outside the gas outlet and opposite to the peripheral region of the air inlet;

[0017] It is characterized by further including:

[0018] A guide tube is arranged in the ejector tube and extends along the first axial direction. The inside of the guide tube is hollow to form a first chamber, and the inlet of the first chamber corresponds to the central region of the air inlet. The outer peripheral wall of the guide tube is opposite to the inner peripheral wall of the ejector tube to form an annular second chamber, and the inlet of the second chamber corresponds to the peripheral region of the air inlet. At the same time, a plurality of through holes penetrating the wall thickness are distributed at intervals on the peripheral wall of the guide tube, so that the blast air in the second chamber can pass through the through holes and enter the first chamber.

[0019] In this way, the blast air in the second chamber can enter the first chamber through the through holes and form an air barrier along the inner wall of the first chamber. The gas can pass through the center of the air barrier. The air barrier can reduce the resistance loss between the gas and the inner wall surface of the first chamber and ensure the mixing effect between the gas and the air.

[0020] The above-mentioned air intake seat can be a single component formed with the gas passage and the blast air passage as described above, or can be an assembly that arranges and limits the independent gas passage and the blast air passage together.

[0021] To further promote the formation of the air barrier, preferably, the guide pipe is provided with at least two through holes at the same cross-sectional position, which are arranged at intervals along the above-mentioned first circumferential direction.

[0022] Preferably, at least two through holes at the same cross-sectional position are taken as a group, and there are multiple groups which are distributed at intervals along the first axial direction.

[0023] Furthermore, the number of through holes on the guide pipe at the same cross-sectional position is 4 to 10, and they are arranged at equal intervals along the first circumferential direction.

[0024] Preferably, the aperture of the through hole is 0.5 to 1.5 mm.

[0025] In this way, through the design of the aperture and quantity of the through holes, it can be ensured that a negative pressure can be generated inside the first chamber under the action of the rapidly flowing gas, so that the blast air in the second chamber can better enter the first chamber and flow along the side wall of the first chamber, forming an air barrier; at the same time, the gas can be evenly mixed with the blast air in the first chamber, and the blast air in the first chamber can also relieve the floating of the gas.

[0026] In the above-mentioned various solutions, the gas passage and the blast air passage can be isolated from each other or not. Preferably, the gas passage and the blast air passage are isolated from each other. The isolated gas passage and blast air passage enable the gas and the blast air to be mixed only in the ejector pipe. In this way, there is only gas and no air in the gas passage, which can avoid the situation of explosion of the gas in the gas passage due to contact with air.

[0027] Preferably, the air intake seat is formed with a gas passage, a blast air passage and an outlet end wall opposite to the intake port of the above-mentioned ejector pipe, and the gas outlet of the gas passage and the air outlet of the blast air passage both penetrate through the outlet end wall. That is, the air intake seat is a single component formed with a gas passage and a blast air passage, and the gas outlet and the air outlet are distributed at intervals on the outlet end wall.

[0028] To further solve the above-mentioned second technical problem, preferably, along the gas flow direction, the ejector pipe has a contraction section, a mixing section and a diffuser section which are connected in sequence. The flow area of the cross-section of the contraction section gradually decreases along the gas flow direction. The port of the contraction section is the intake port of the ejector pipe, and the flow area of the cross-section of the diffuser section gradually increases along the gas flow direction;

[0029] The draft tube extends from the air inlet of the ejector tube into the diffuser section, and the through hole is formed in the part of the draft tube located in the diffuser section.

[0030] Since the draft tube extends from the air inlet of the ejector tube into the diffuser section, the gas ejected from the gas outlet and the air output from the air outlet respectively enter their corresponding first chamber and second chamber, thus avoiding the interference between the blowing air and the gas; forming the through hole in the part of the draft tube located in the diffuser section can ensure the formation of the air barrier while facilitating the mixing between the gas and the air.

[0031] Preferably, along the gas flow direction, the diameter of the part of the draft tube located in the contraction section gradually decreases, and the diameter of the part of the draft tube located in the mixing section and the diffuser section gradually increases.

[0032] To further solve the above-mentioned third technical problem, preferably, the edge of the inlet of the draft tube is opposite to and integrally connected with the edge of the gas outlet of the above-mentioned gas passage, and a natural ejection passage extending along a direction intersecting with the above-mentioned first axis is formed at the connection, the air ejection inlet of the natural ejection passage communicates with the external environment, and the air ejection outlet of the natural ejection passage is arranged adjacent to the gas outlet of the gas passage and communicates with the gas outlet.

[0033] In this way, when the gas is ejected from the gas outlet, the negative pressure generated can eject the external air through the natural ejection passage, thus avoiding the influence of the blowing air on the natural ejection.

[0034] Preferably, the periphery of the air outlet end wall of the air inlet seat is opposite to and integrally connected with the edge of the air inlet of the above-mentioned ejector tube, and the air ejection outlet of the natural ejection passage is located outside the area surrounded by the periphery of the air outlet end wall of the air inlet seat.

[0035] Preferably, there are at least two air outlets of the blowing air passage, and they are arranged at intervals along the above-mentioned first circumferential direction;

[0036] The natural ejection passage is arranged between two adjacent air outlets.

[0037] In this way, at least two air outlets can ensure the balance of the blowing air volume, so that the blowing air in the second chamber can be more evenly distributed, further facilitating the formation of the air barrier and the mixing uniformity between the gas and the blowing air. At the same time, the natural ejection passage arranged between two adjacent air outlets will not affect the ejection of the blowing air.

[0038] To enable the blowing air flow to be smoothly discharged, preferably, the blowing air passage extends along the above-mentioned first axis.

[0039] Preferably, along the gas flow direction, the gas passage has an intake section, a buffer section, and an outlet section that are connected in sequence. The intake section extends in a direction intersecting with the first axial direction, and the port of the intake section is the gas inlet of the gas passage. The outlet section extends along the first axial direction, and the port of the outlet section is the gas outlet. In this way, the gas inlet and the air inlet are not on the same side of the intake seat, which facilitates the input of the gas source and the installation of the blower device. At the same time, the settings of the intake section, the buffer chamber, and the outlet section can ensure that the gas is smoothly and stably output from the gas outlet, reducing the risk of gas turbulence.

[0040] To enable both the gas passage and the blower air passage in the intake seat to work well, preferably, there are two air outlets of the blower air passage, which are arranged one above the other on both sides of the gas outlet of the gas passage;

[0041] The interior of the intake seat has an upper cavity and a lower cavity that are arranged one above the other and extend along the first axial direction, and the two are separated by an intermediate baffle. The upper cavity and the lower cavity together form the above-mentioned blower air passage, and the two air outlets of the blower air passage are respectively opposite to and connected to the upper cavity and the lower cavity;

[0042] The intermediate baffle is formed with a hollow part that serves as the buffer section and the outlet section of the gas passage, and the extending direction of the buffer section is the same as the extending direction of the intake section of the gas passage.

[0043] In this way, the intermediate baffle can not only be used to form the buffer section and the outlet section of the gas passage, but also separate the internal space of the intake seat, so that the gas passage and the blower air passage do not interfere with each other, and both can work well, enabling the air flow to smoothly flow through the corresponding passages. And the structure is relatively compact.

[0044] The technical solution adopted by the present invention to solve the above fourth technical problem is: an ejector system having an ejector assembly as described above, characterized in that: it further includes a blower device as the blower air source, and the air outlet end of the blower device is in fluid communication with the air inlet of the blower air passage of the intake seat.

[0045] The technical solution adopted by the present invention to solve the above fifth technical problem is: a gas stove having an ejector system as described above.

[0046] Compared with the prior art, the advantages of the present invention are as follows: by arranging a flow guide pipe in the ejector pipe, the flow guide pipe has a first chamber inside, the inlet of the first chamber corresponds to the central area of the air inlet for the gas to enter, and an annular second chamber is formed between the outer peripheral wall of the flow guide pipe and the inner peripheral wall of the ejector pipe. The inlet of the second chamber corresponds to the peripheral area of the air inlet for the blast air to enter. At the same time, a plurality of through holes penetrating the wall thickness are distributed at intervals on the peripheral wall of the flow guide pipe. In this way, the blast air in the second chamber can enter the first chamber through the through holes and form an air barrier along the inner wall of the first chamber. The gas can pass through the center of the air barrier, and the air barrier can reduce the resistance loss between the gas and the inner wall surface of the first chamber and ensure the mixing effect between the gas and the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic structural view of an ejector assembly in an embodiment of the present invention;

[0048] Figure 2 is a schematic structural view of the ejector assembly in another perspective in an embodiment of the present invention;

[0049] Figure 3 is a schematic structural view of the ejector assembly in yet another perspective in an embodiment of the present invention;

[0050] Figure 4 is a longitudinal sectional view of the ejector assembly in an embodiment of the present invention (the section is a horizontal plane extending along the first axial direction);

[0051] Figure 5 is a longitudinal sectional view of the ejector assembly in an embodiment of the present invention (the section is a vertical plane extending along the first axial direction);

[0052] Figure 6 is a transverse sectional view of the ejector assembly in an embodiment of the present invention;

[0053] Figure 7 is a schematic structural view of a gas cooker in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0055] As Figures 1 to 7 shown, a preferred embodiment of an ejector assembly, an ejector system and a gas cooker of the present invention is shown. The ejector assembly includes an ejector pipe 1, an air inlet seat 4 and a flow guide pipe 8.

[0056] The ejector pipe 1 is arranged substantially horizontally. Denote the length direction of the ejector pipe 1 as the first axial direction, and the direction around the first axial direction as the first circumferential direction; the ejector pipe 1 has an air inlet 10, and the air inlet 10 has a central area 11 and a peripheral area 12 located around the central area 11.

[0057] Meanwhile, along the gas flow direction, the ejector tube 1 has a converging section 1a, a mixing section 1b, and a diffusing section 1c that are connected in sequence. The flow area of the cross-section of the converging section 1a gradually decreases along the gas flow direction. The upstream port of the converging section 1a is the air inlet 10 of the ejector tube 1. The flow area of the cross-section of the diffusing section 1c gradually increases along the gas flow direction.

[0058] The above-mentioned guide tube 8 is arranged inside the ejector tube 1 and extends from the air inlet 10 of the ejector tube 1 along the first axial direction into the diffusing section 1c. The inside of the guide tube 8 is hollow to form a first chamber 81, and the entrance of the first chamber 81 corresponds to the central region 11 of the above-mentioned air inlet 10. The outer peripheral wall of the guide tube 8 and the inner peripheral wall of the ejector tube 1 face each other to form an annular second chamber 82, and the entrance of the second chamber 82 corresponds to the peripheral region 12 of the above-mentioned air inlet 10. At the same time, a plurality of through holes 80 penetrating the wall thickness are distributed at intervals on the peripheral wall of the guide tube 8 corresponding to the diffusing section 1c, so that the blast air in the second chamber 82 can pass through the through holes 80 and enter the first chamber 81. In this embodiment, 4 to 10 through holes 80 are provided at the same cross-sectional position of the guide tube 8, the aperture of each through hole 80 is 0.5 to 1.5 mm, and each through hole 80 is arranged at intervals along the above-mentioned first circumferential direction; taking the 4 to 10 through holes 80 at the same cross-sectional position as a group, there are multiple groups and they are distributed at intervals along the first axial direction. At the same time, along the gas flow direction, the diameter of the part of the guide tube 8 located in the converging section 1a gradually decreases, and the diameter of the part of the guide tube 8 located in the mixing section 1b and the diffusing section 1c gradually increases.

[0059] Along the gas flow direction, the air inlet seat 4 is located upstream of the air inlet 10 of the ejector tube 1. The air inlet seat 4 is formed with a gas channel 41, a blast air channel 42, and an outlet end wall 400 opposite to the air inlet 10 of the above-mentioned ejector tube 1 that are isolated from each other. Specifically, as Figure 3 、 5 、as shown in 6, the inside of the air inlet seat 4 has an upper cavity 4a and a lower cavity 4b that are arranged one above the other and extend along the first axial direction. The two are separated by an intermediate baffle 44. There are two air outlets 42b of the blast air channel 42, which are arranged one above the other, and respectively penetrate the outlet end wall 400 of the air inlet seat 4 and are opposite to and communicate with the above-mentioned upper cavity 4a and lower cavity 4b. At this time, the upper cavity 4a and the lower cavity 4b together form the blast air channel 42. The two air outlets 42b of the blast air channel 42 are both opposite to the peripheral region 12 of the air inlet 10 of the ejector tube 1; the air inlet 42b of the blast air channel 42 is used to be in fluid communication with the blast air source and is located on the end wall of the air inlet seat 4 opposite to the outlet end wall 400.

[0060] As Figures 4 to 6As shown, along the gas flow direction, the gas passage 41 has an intake section 411, a buffer section 412, and an outlet section 413 that are sequentially connected and communicate with each other. The intake section 411 extends in a direction perpendicular to the first axial direction, and the port of the intake section 411 is the gas inlet 41a of the gas passage 41, which is used to be in fluid communication with the gas source. The outlet section 413 extends along the first axial direction, and the port of the outlet section 413 serves as the gas outlet 41b of the gas passage 41, penetrates the above-mentioned outlet end wall 400, and faces the central region 11 of the intake port 10 of the ejector tube 1. In this embodiment, the intermediate baffle 44 is formed with a hollow portion serving as the buffer section 412 and the outlet section 413 of the gas passage 41, and the extending direction of the buffer section 412 is the same as the extending direction of the intake section 411 of the gas passage 41.

[0061] In this embodiment, as Figure 4 , 5 shown, the edge of the gas outlet 41b of the gas passage 41 faces and is integrally connected to the edge of the inlet of the diversion tube 8. A natural ejection passage 3 is formed at the connection, which extends in a direction perpendicular to the above-mentioned first axial direction. The air ejection inlet 3a of the natural ejection passage 3 communicates with the external environment. The air ejection outlet 3b of the natural ejection passage 3 is arranged adjacent to the gas outlet 41b of the gas passage 41 and is in communication with the gas outlet 41b. At the same time, the periphery of the outlet end wall 400 of the intake seat 4 faces and is integrally connected to the edge of the intake port 10 of the ejector tube 1. The air ejection outlet 3b of the natural ejection passage 3 is located outside the area surrounded by the periphery of the outlet end wall 400 of the intake seat 4. And the natural ejection passage 3 is arranged between two adjacent air outlets 42b.

[0062] In this way, when the air blowing stops, the gas ejected from the gas outlet can also eject natural air. At this time, the gas stove can work in a low-fire state. When there is air blowing, the air blowing will not affect the natural ejection.

[0063] As Figure 7 shown, the ejection system of this embodiment includes the above-mentioned ejection assembly and a blowing device 5 serving as the air blowing source. The outlet end of the blowing device 5 is in fluid communication with the air inlet 42a of the blowing air passage 42 of the intake seat 4. In this way, the air flow output by the blowing device 5 can flow out from the air outlet 42b after passing through the blowing air passage 42. The blowing device 5 can adopt an existing blower, and whether there is air flow flowing out of the air outlet 42b can be controlled by controlling the startup or shutdown of the blower. At the same time, the flow rate and flow volume of the air flow flowing out of the air outlet 42b can be controlled by controlling the working power of the blowing device 5.

[0064] As Figure 7 shown, in addition to the above-mentioned ejection system, the gas stove of this embodiment also has a burner, which is a prior art and is in communication with the outlet of the ejector tube 1.

[0065] As used herein, "fluid communication" refers to the spatial relationship between two components or locations (hereinafter uniformly referred to as the first location and the second location respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first location along a flow path and / or be transported to the second location. It can be a direct connection between the first location and the second location, or an indirect connection between the first location and the second location through at least one third party. The third party can be a fluid passage such as a pipe, channel, conduit, flow guide, hole, groove, etc., or a chamber that allows fluid to flow through, or a combination of the above.

Claims

1. An ejector assembly of a burner, comprising: An ejector tube (1) having an air inlet (10), the air inlet (10) having a central region (11) and a peripheral region (12) surrounding the central region (11), and the length direction of the ejector tube (1) being defined as the first axial direction, and the direction around the first axial direction being the first circumferential direction; An air inlet seat (4) having a gas passage (41) and a blast air passage (42), wherein the gas inlet (41a) of the gas passage (41) is used to be in fluid communication with a gas source, and the air inlet (42a) of the blast air passage (42) is used to be in fluid communication with a blast air source; Along the gas flow direction, the air inlet seat (4) is located upstream of the air inlet (10) of the ejector tube (1), and the gas outlet (41b) of the gas passage (41) is opposite to the central region (11) of the air inlet (10), and the air outlet (42b) of the blast air passage (42) is located outside the gas outlet (41b) and is opposite to the peripheral region (12) of the air inlet (10); Characterized in that It further comprises: A diversion tube (8) disposed in the ejector tube (1) and extending along the first axial direction, the interior of the diversion tube (8) being hollow to form a first chamber (81), and the inlet of the first chamber (81) corresponding to the central region (11) of the air inlet (10), the outer peripheral wall of the diversion tube (8) being opposite to the inner peripheral wall of the ejector tube (1) to form an annular second chamber (82), and the inlet of the second chamber (82) corresponding to the peripheral region (12) of the air inlet (10), and at the same time, a plurality of through holes (80) penetrating the wall thickness are distributed at intervals on the peripheral wall of the diversion tube (8), so that the blast air in the second chamber (82) can pass through the through holes (80) and enter the first chamber (81).

2. The ejector assembly according to claim 1, wherein: At least two through holes (80) are provided at the same cross-sectional position of the diversion tube (8), and are arranged at intervals along the first circumferential direction.

3. The ejector assembly according to claim 2, characterized in that: Taking at least two through holes (80) at the same cross-sectional position as a group, there are multiple groups and they are distributed at intervals along the first axial direction.

4. The ejector assembly according to claim 2, characterized in that: There are 4 - 10 through holes (80) at the same cross-sectional position of the diversion tube (8), and they are arranged at equal intervals along the first circumferential direction.

5. The ejector assembly according to claim 4, wherein: The aperture of the through hole (80) is 0.5 - 1.5 mm.

6. The ejector assembly according to any one of claims 1 to 5, characterized in that: The gas passage (41) and the blast air passage (42) are isolated from each other.

7. The ejector assembly according to claim 6, characterized in that: The air inlet seat (4) is formed with a gas passage (41), a blast air passage (42) and an outlet end wall (400) opposite to the air inlet (10) of the ejector tube (1), and the gas outlet (41b) of the gas passage (41) and the air outlet (42b) of the blast air passage (42) both penetrate through the outlet end wall (400).

8. The ejector assembly according to claim 7, wherein: Along the gas flow direction, the ejector tube (1) has a converging section (1a), a mixing section (1b) and a diffusing section (1c) which are connected in sequence. The flow area of the cross-section of the converging section (1a) gradually decreases along the gas flow direction. The port of the converging section (1a) is the air inlet (10) of the ejector tube (1). The flow area of the cross-section of the diffusing section (1c) gradually increases along the gas flow direction. The guide tube (8) extends from the air inlet (10) of the ejector tube (1) to the inside of the diffusing section (1c), and the through hole (80) is formed on the part of the guide tube (8) located inside the diffusing section (1c).

9. The ejector assembly according to claim 8, characterized in that: Along the gas flow direction, the diameter of the part of the guide tube (8) located inside the converging section (1a) gradually decreases, and the diameters of the parts of the guide tube (8) located inside the mixing section (1b) and the diffusing section (1c) gradually increase.

10. The ejector assembly according to claim 8, wherein: The edge of the inlet of the guide tube (8) is opposite to and integrally connected with the edge of the gas outlet (41b) of the gas passage (41). A natural ejector passage (3) is formed at the connection and extends along a direction intersecting with the first axial direction. The air inlet (3a) of the natural ejector passage (3) communicates with the external environment. The air outlet (3b) of the natural ejector passage (3) is arranged adjacent to the gas outlet (41b) of the gas passage (41) and communicates with the gas outlet (41b).

11. The ejector assembly according to claim 10, wherein: The periphery of the air outlet end wall (400) of the air inlet seat (4) is opposite to and integrally connected with the edge of the air inlet (10) of the ejector tube (1). The air outlet (3b) of the natural ejector passage (3) is located outside the area surrounded by the periphery of the air outlet end wall (400) of the air inlet seat (4).

12. The ejector assembly according to claim 10, characterized in that: There are at least two air outlets (42b) of the blast air passage (42), and they are arranged at intervals along the first circumferential direction. The natural ejector passage (3) is arranged between two adjacent air outlets (42b).

13. The ejector assembly according to claim 7, wherein: The blast air passage (42) extends along the first axial direction.

14. The ejector assembly according to claim 13, characterized in that: Along the gas flow direction, the gas passage (41) has an intake section (411), a buffer section (412) and an outlet section (413) which are connected in sequence. The intake section (411) extends along a direction intersecting with the first axial direction, and the port of the intake section (411) is the gas inlet (41a) of the gas passage (41). The outlet section (413) extends along the first axial direction, and the port of the outlet section (413) is the gas outlet (41b).

15. The ejector assembly according to claim 14, characterized in that: There are two air outlets (42b) of the blast air passage (42), and they are arranged one above the other on both sides of the gas outlet (41b) of the gas passage (41). The interior of the intake seat (4) has an upper cavity (4a) and a lower cavity (4b) which are arranged one above the other and extend along a first axial direction, and are separated by an intermediate baffle (44). The upper cavity (4a) and the lower cavity (4b) together form the above-mentioned blast air passage (42), and the two air outlets (42b) of the blast air passage (42) are respectively opposite to and communicated with the upper cavity (4a) and the lower cavity (4b). The intermediate baffle (44) is formed with a hollow part serving as a buffer section (412) and an air outlet section (413) of the gas passage (41), and the extending direction of the buffer section (412) is the same as that of the intake section (411) of the gas passage (41).

16. An ejector system having an ejector assembly as described in any one of claims 1 to 15, characterized in that: It further includes a blast device (5) serving as a blast air source, and the air outlet end of the blast device (5) is in fluid communication with the air inlet (42a) of the blast air passage (42) of the intake seat (4).

17. A gas cooker having an ejector system as described in claim 16.

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