Ejecting structure, furnace end and combustor

Abstract

The utility model belongs to the technical field of combustion, and particularly discloses an injection structure, a furnace end and a combustor. The injection structure comprises an injection pipe body and an air exhaust assembly, the injection pipe body is provided with a shrinkage cavity, a pump cavity and an expansion cavity which are sequentially arranged, the cross sectional areas of the shrinkage cavity and the expansion cavity are gradually increased in the direction away from the pump cavity, and air inlets are formed in the two cavity side walls, oppositely arranged in the second direction, of the pump cavity; the air exhaust assembly comprises a rotor assembly and a driving motor, the rotor assembly comprises two rotors installed in the pump cavity, the driving motor drives the rotor assembly to rotate, and the air exhaust assembly and the pump cavity are matched to form a roots pump structure. The furnace end comprises an inner ring injection pipe and an outer ring injection pipe, and at least the outer ring injection pipe adopts the injection structure. According to the utility model, the air exhaust assembly is matched with the pump cavity to form a roots pump structure, so that the air supply amount entering the injection pipe body can be increased, the mixing uniformity of air and fuel gas in the injection pipe body is improved, and the combustion reliability and the combustion sufficiency are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of combustion, in particular to an ejector structure, a burner head and a burner. Background Art

[0002] A gas stove is a common kitchen appliance that heats cooking utensils by igniting and burning gas. The burner is the core device of the gas stove, and its performance directly affects the performance of the gas stove.

[0003] A burner typically consists of a burner head, a flame distributor, and a flame cover, arranged in order from bottom to top. The burner head has an ejector tube, with a nozzle at the air inlet end. Gas ejected from the nozzle enters the ejector tube, creating a negative pressure inside the tube. This forces outside air into the tube and mixes with the gas to form a premixed gas. The premixed gas is then diverted by the flame distributor and flows to the flame holes in the flame cover for combustion.

[0004] Since the amount of gas and air required for the flame combustion at the outer ring fire cover is large, in order to avoid the problem of insufficient air caused by the insufficient ejection capacity of the ejector tube, the existing technology sets a blower at the inlet end of the ejector tube, and blows more air into the ejector tube through the rotation of the impeller in the blower. However, although the setting of the blower can increase the amount of air entering the ejector tube, the blower generates airflow through the rotation of multiple blades in the impeller around the same axis, which has a large air volume but poor stability. In addition, the air intake of the ejector tube is greatly affected by the wind pressure, which is not conducive to the stability of the air supply of the ejector tube. At the same time, due to the low wind pressure of the airflow generated by the blower, the flow rate of the mixed airflow after flowing out of the ejector tube and the burner head is low, which is not conducive to stable combustion. Utility Model Content

[0005] One of the technical problems solved by the present invention is to provide an ejection structure, which can effectively solve the problems of poor air intake stability and difficult control of air flow rate caused by the use of a blower to increase the air intake volume of the ejection pipe in the prior art, while increasing the air intake volume of the ejection structure and improving the stability of the air intake.

[0006] The second technical problem solved by the present invention is to provide a burner head, which can effectively solve the problems of poor air intake stability, great influence of wind pressure on air intake volume and difficulty in increasing air flow rate caused by the use of a blower in existing burners. While increasing the air intake volume of the burner head, it also increases the stability of the burner head's air supply.

[0007] The third technical problem solved by the present invention is to provide a burner that can effectively solve the problem of poor combustion stability and reduced combustion reliability caused by the use of a blower for air in existing burners.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] An ejection structure, comprising:

[0010] An ejector tube body, the ejector tube body having a contraction chamber, a pump chamber, and an expansion chamber sequentially arranged along a first direction, the cross-sectional areas of the contraction chamber and the expansion chamber gradually increasing in a direction away from the pump chamber, and an air inlet being provided on two cavity side walls of the pump chamber oppositely arranged along a second direction, the second direction being arranged at an angle to the first direction;

[0011] The air extraction assembly includes a rotor assembly and a drive motor. The rotor assembly includes two rotors rotatably installed in the pump chamber. The drive motor is installed on the outside of the ejector tube body and drives the rotor assembly to rotate. The air extraction assembly cooperates with the pump chamber to form a Roots pump structure.

[0012] Compared with the background technology, the ejection structure described in the present invention has the following beneficial effects: by combining the air extraction component and the pump chamber to form a Roots pump structure, and opening an air inlet on the wall of the pump chamber, when the rotor component rotates, a negative pressure can be formed in the pump chamber through the rotation of the rotor, so that the air enters the pump chamber from the inlet end and the air inlet of the compression chamber under the combined action of the negative pressure formed by the rotation of the rotor and the negative pressure formed by the jet flow of the gas, thereby enhancing the ejection ability of the ejection structure for air and effectively increasing the air intake volume; since the gas and air enter the pump chamber, they are continuously rotated by the rotor to form a negative pressure in the pump chamber, thereby increasing the air intake volume; The gas and air are discharged into the expansion chamber, and the gas and air are stirred by the rotor in the pump chamber and mixed more evenly, thereby improving the uniformity of the mixing of the gas and air; furthermore, compared with the conventional setting of using a blower for blowing, due to the volumetric working principle of the Roots pump structure, it can accelerate the flow of air in the ejector tube body, thereby increasing the flow rate of the airflow out of the ejector structure, and since the intake and exhaust are achieved by the mutual rotation of the two rotors, the intake is not affected by the external temperature, pressure or gas composition, thereby improving the stability and reliability of the air intake, thereby improving the stability and reliability of the mixed airflow out of the ejector structure.

[0013] In one embodiment, the maximum width of the pump chamber along the first direction is smaller than the maximum width of the pump chamber along the second direction, an air inlet communication port is formed at the connection between the pump chamber and the contraction chamber, an air exhaust communication port is formed at the connection between the pump chamber and the expansion chamber, and each of the cavity side walls is located between the air inlet communication port and the air exhaust communication port;

[0014] The rotating shafts of the two rotors are arranged along the third direction, the first direction, the second direction and the third direction are perpendicular to each other, the rotating shafts of the two rotors are opposite and spaced apart in the second direction, each of the rotors is a bladed rotor, and the rotation directions of the two rotors are opposite.

[0015] In one embodiment, in the first direction, the air inlet is arranged close to the air inlet communication port, and each of the rotors can be rotated and switched between a first position and a second position;

[0016] When the rotor is in the first position, the rotor is disposed between the air inlet and the air outlet along the first direction, and the rotor and the cavity sidewall adjacent to the rotor form a compression chamber, which is communicated with the corresponding air inlet.

[0017] When the rotor is in the second position, the rotor is disposed between the intake communication port and the exhaust communication port along the second direction, and the intake communication port and the intake port are located on the same side of the rotor and communicate with each other;

[0018] The two rotors are arranged in linkage and are preset to rotate in opposite directions, so that when one rotor rotates to the first position, the other rotor is located at the second position.

[0019] In one embodiment, the air inlet extends in a direction away from the pump chamber and forms an air inlet channel, and the ventilation area of the air inlet channel gradually increases in a direction away from the pump chamber;

[0020] And / or, the pump chamber and the two air inlets are symmetrically arranged relative to a plane perpendicular to the second direction.

[0021] In one embodiment, the ejector tube body includes a main body and a cover, the main body includes a contraction tube portion, a mounting portion and an expansion tube portion connected in sequence along the first direction, the inner cavity of the contraction tube portion forms the contraction cavity, the inner cavity of the expansion tube portion forms the expansion cavity, the mounting portion has a mounting groove with one end open, the mounting groove is connected to both the expansion cavity and the contraction cavity, the cover is removably covered on the notch of the mounting groove, and the cover and the mounting portion are arranged to form the pump cavity.

[0022] In one embodiment, each of the rotors is rotatably mounted on the ejector tube body via a rotating shaft, and one of the rotating shafts extends out of the cover and is connected to the driving motor.

[0023] In one embodiment, a cavity wall of the pump cavity facing the cover is provided with a positioning groove, the positioning groove is arranged in a one-to-one correspondence with the rotating shaft, and the end of the rotating shaft away from the cover is rotatably installed in the positioning groove.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] A burner head comprises an inner ring ejector tube and an outer ring ejector tube, at least the outer ring ejector tube adopts the ejection structure as described above.

[0026] Compared with the background technology, the burner head described in the present invention has the following beneficial effects: by adopting the above-mentioned ejection structure for at least the outer ring ejector tube, the ejection capacity of the outer ring ejector tube can be enhanced, thereby increasing the air intake volume of the outer ring ejector tube and the mixing uniformity of air and gas, and can effectively improve the supply stability of the burner head and ensure the supply gas flow rate of the burner head.

[0027] In one embodiment, the burner further comprises a main body, wherein the main body comprises an inner ring premixing cavity and an outer ring premixing cavity;

[0028] A mounting seat is connected between the gas outlet ends of the inner ring ejector tube and the outer ring ejector tube, and the mounting seat is detachably connected to the main seat body. The inner cavity of the outer ring ejector tube is communicated with the outer ring premixing cavity, and the inner cavity of the inner ring ejector tube is communicated with the inner ring premixing cavity.

[0029] The third technical problem mentioned above is solved by the following technical solution:

[0030] A burner comprises the burner head described above.

[0031] Compared with the background technology, the burner described in the present invention has the following beneficial effects: by adopting the above-mentioned burner head, the air intake volume during the burner combustion process can be increased, the mixing uniformity of air and gas can be improved, and the airflow stability of the premixed gas and the speed of the airflow out of the burner can be improved, thereby improving the combustion stability and reliability, reducing the exhaust gas generated by combustion, and improving combustion safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic structural diagram of a burner provided by an embodiment of the present invention at one viewing angle;

[0033] Figure 2 A schematic structural diagram of a burner provided by an embodiment of the present invention from another perspective;

[0034] Figure 3 A cross-sectional view of the burner head provided by an embodiment of the present utility model at the outer ring ejector tube;

[0035] Figure 4 A partial structural cross-sectional view of a burner provided in an embodiment of the present utility model;

[0036] Figure 5 A cross-sectional view of a burner provided in an embodiment of the present invention at another cross-sectional view;

[0037] Figure 6 This is a schematic diagram of the operation of the rotor assembly of the ejection structure provided in an embodiment of the present utility model.

[0038] Description of labels:

[0039] 100, ejector assembly; 101a, outer ring ejector tube; 101b, inner ring ejector tube; 102, mounting base; 103, connecting bridge; 200, main base; 201, inner ring premixing chamber; 202, outer ring premixing chamber;

[0040] 1. Ejector tube body; 11. Contraction tube portion; 111. Contraction cavity; 12. Mounting portion; 121. Pump cavity; 1211. Cavity sidewall; 1212. Air inlet; 1213. Positioning groove; 1214. Air inlet connection port; 1215. Exhaust connection port; 13. Expansion tube portion; 131. Expansion cavity; 14. Air inlet portion; 141. Air inlet passage; 15. Cover;

[0041] 2. Pumping assembly; 21. Rotor assembly; 211. Rotor; 211a. First rotor; 211b. Second rotor; 212. Rotating shaft; 22. Drive motor;

[0042] 10. Compression chamber; 20. Intake chamber; 30. Exhaust chamber. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0045] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0047] This embodiment provides a burner head that can be used in a burner to achieve the injection and premixing of gas and air, increase the amount of air injection, improve the mixing uniformity of gas and air, and thus improve the combustion performance of the burner.

[0048] Specifically, if Figures 1 to 3 As shown, the burner head includes a main body 200 and an ejection assembly 100, the main body 200 has an inner ring premixing chamber 201 and an outer ring premixing chamber 202, the inner ring premixing chamber 201 is used to supply a mixed gas of air and gas to the inner ring fire cover in the burner, and the outer ring premixing chamber 202 is used to supply a mixed gas to the outer ring fire cover in the burner; the ejection assembly 100 includes two ejection tubes side by side, the two ejection tubes are respectively an inner ring ejection tube 101b and an outer ring ejection tube 101a, the inner cavity of the inner ring ejection tube 101b forms an inner ring ejection channel, the gas outlet end of the inner ring ejection channel is connected to the inner ring premixing chamber 201, the inner cavity of the outer ring ejection tube 101a forms an outer ring ejection channel, the gas outlet end of the outer ring ejection channel is connected to the outer ring premixing chamber 202.

[0049] In this embodiment, at least the outer ring ejector tube 101a adopts the following ejection structure: the ejection structure includes an ejection tube body 1 and an air extraction assembly 2; the ejection tube body 1 has a contraction chamber 111, a pump chamber 121 and an expansion chamber 131 arranged in sequence along a first direction, and the cross-sectional areas of the contraction chamber 111 and the expansion chamber 131 gradually increase in the direction away from the pump chamber 121, and the two cavity side walls 1211 of the pump chamber 121 arranged opposite to each other along the second direction are each provided with an air inlet 1212, and the second direction is arranged at an angle to the first direction; the air extraction assembly 2 includes a rotor assembly 21 and a drive motor 22, the rotor assembly 21 includes two rotors 211 rotatably installed in the pump chamber 121, the drive motor 22 is installed on the outside of the ejector tube body 1 and drives the rotor assembly 21 to rotate, and the air extraction assembly 2 cooperates with the pump chamber 121 to form a Roots pump structure.

[0050] The ejection structure provided in this embodiment is provided with an air extraction component 2 and a pump chamber 121 in the ejection tube body 1. The air extraction component 2 and the pump chamber 121 cooperate to form a Roots pump structure, so that when the rotor component 21 rotates, a negative pressure can be formed in the pump chamber 121 through the rotation of the rotor 211, so that the air can not only enter the ejection tube body 1 under the action of the negative pressure formed by the gas injection inside the ejection tube body 1, but also enter the ejection tube body 1 through the negative pressure formed in the pump chamber 121 by the rotor component 21, thereby enhancing the ejection ability of the ejection structure for air and increasing the air intake amount; since the air inlet 1212 is provided on the cavity side wall 1211 of the pump chamber 121, the external air can not only enter the ejection tube body 1 through the inlet of the contraction cavity 111, but also enter the pump chamber 12 through the air inlet 1212. 1, thereby being able to further increase the amount of air entering the ejector tube body 1; since the gas and air enter the pump chamber 121, they are continuously discharged into the expansion chamber 131 through the rotation of the rotor 211, and the gas and air are stirred and mixed more evenly in the pump chamber 121 by the rotor 211, thereby improving the uniformity of the mixing of the gas and air; furthermore, compared with the conventional setting of using a blower for blowing, due to the volumetric working principle of the Roots pump structure, it can accelerate the flow of the airflow in the ejector tube body 1, thereby increasing the flow rate of the airflow out of the ejector structure, and since the intake and exhaust are realized by the mutual counter-rotation of the two rotors 211, the intake is not affected by the external temperature, pressure or gas composition, thereby improving the stability and reliability of the air intake, thereby improving the stability and reliability of the mixed airflow out of the ejector structure.

[0051] The burner provided in this embodiment can enhance the ejection capability of the outer ring ejector tube 101a by adopting the above ejection structure for at least the outer ring ejector tube 101a, thereby increasing the air intake of the outer ring ejector tube 101a and the mixing uniformity of air and gas.

[0052] Since the outer ring fire cover requires a large amount of gas and air, it is more likely to have a problem of insufficient air intake, while the inner ring fire cover requires a relatively small amount of premixed gas. In order to reduce costs and simplify the structure of the burner, in one embodiment, only the outer ring ejector tube 101a adopts the above-mentioned ejection structure, while the inner ring ejector tube 101b adopts a conventional ejector tube structure, so as to improve the performance of the entire burner while reducing the cost of the burner and the burner. The contraction chamber 111, the pump chamber 121 and the expansion chamber 131 are connected in sequence to form the outer ring ejection channel of the outer ring ejector tube 101a. In other embodiments, the inner ring ejector tube 101b and the outer ring ejector tube 101a may also adopt an ejection structure with the above-mentioned ejector tube body 1 and the exhaust assembly 2.

[0053] like Figure 3 and Figure 4As shown, in one embodiment, the maximum width of the pump chamber 121 along the first direction is smaller than its maximum width along the second direction. An inlet opening 1214 is formed at the connection between the pump chamber 121 and the contraction chamber 111, and an exhaust opening 1215 is formed at the connection between the pump chamber 121 and the expansion chamber 131. Each chamber sidewall 1211 is located between the inlet opening 1214 and the exhaust opening 1215. The inlet opening 1214 and the exhaust opening 1215 are spaced apart from each other in the first direction. The cross-sectional area of the expansion chamber 131 gradually increases away from the exhaust opening 1215, while the cross-sectional area of the contraction chamber 111 gradually decreases toward the inlet opening 1214. The dimensions of both the inlet opening 1214 and the exhaust opening 1215 in the second direction are smaller than the maximum dimension of the pump chamber 121 in the second direction. The chamber sidewall 1211 is an arc-shaped structure with its opening facing the center of the pump chamber 121.

[0054] The rotating shafts 212 of the two rotors 211 are arranged along the third direction, with the third direction, the second direction, and the first direction being mutually perpendicular. The rotating shafts 212 of the two rotors 211 are arranged opposite each other and spaced apart in the second direction. This arrangement of the pump chamber 121 facilitates the arrangement of the rotors 211 within the pump chamber 121 and avoids the problem of larger sizes of the intake and exhaust ports 1214, 1215, which would result in larger sizes of the expansion chamber 131 and the contraction chamber 111, and thus a larger size of the ejector tube body 1.

[0055] In one embodiment, in a first direction, the air inlet 1212 is disposed adjacent to the air inlet communication port 1214. Each rotor 211 is a vane-shaped rotor 211 and can rotate and switch between a first position and a second position. When the rotor 211 is in the first position, the rotor 211 is disposed between the air inlet communication port 1214 and the exhaust communication port 1215 along the first direction, and the rotor 211 and the cavity sidewall 1211 adjacent to one side thereof enclose a compression chamber 10, which is in communication with the corresponding air inlet 1212. When the rotor 211 is in the second position, the rotor 211 is disposed between the air inlet communication port 1214 and the exhaust communication port 1215 along the second direction, and the air inlet communication port 1214 and the air inlet 1212 are located on the same side of the rotor 211 and are in communication with each other. The two rotors 211 are arranged in a linked manner and have opposite preset rotation directions, so that when one rotor 211 rotates to the first position, the other rotor 211 is in the second position.

[0056] like Figure 5As shown, for the convenience of description, the two rotors 211 are respectively referred to as the first rotor 211a and the second rotor 211b. When the first rotor 211a is in the first position and the second rotor 211b is in the second position, the first rotor 211a and the adjacent side cavity wall enclose a compression chamber 10. The pump cavity 121 forms an intake chamber 20 and an exhaust chamber 30 on opposite sides of the second rotor 211b in the first direction, and the air inlet 1212 is connected to the intake chamber 20. When the gas enters the contraction cavity 111 from the inlet, the cross-section of the contraction cavity 111 gradually decreases in the direction toward the air inlet communication port 1214, so that a negative pressure is formed at the air inlet communication port 1214. At the same time, the rotation of the two rotors 211 also forms a negative pressure in the pump cavity 121. Since the air inlet 1212 and the air inlet communication port 1214 are both connected to the air inlet chamber 20, part of the air enters the air inlet chamber 20 through the inlet end of the contraction cavity 111. Part of the air enters the intake chamber 20 through the air inlet 1212, so that the air and gas are mixed in the intake chamber 20; when the two rotors 211 continue to rotate, the first rotor 211a passes over the edge of the exhaust connecting port 1215, so that the compression chamber 10 is connected with the exhaust chamber 30. Since the pressure at the exhaust connecting port 1215 is larger than that at the compression chamber 10, part of the airflow in the expansion chamber 131 will rebound to the compression chamber 10 to form an airflow mixing, and the mixed airflow is squeezed under the rotation of the rotor 211 and discharged into the expansion chamber 131 through the exhaust connecting port 1215; in the process of the second rotor 211b rotating from the second position to the first position, the mixed gas of air and gas in the intake chamber 20 is squeezed into the compression chamber 10 formed by the second rotor 211b and the adjacent chamber side wall 1211 under the action of the second rotor 211b, and is discharged into the expansion chamber 131 under the continued rotation of the second rotor 211b. As the first rotor 211 a and the second rotor 211 b continue to rotate, air and gas continuously enter the intake chamber 20 , the compression chamber 10 , and the exhaust chamber 30 in sequence and are then discharged.

[0057] In this embodiment, the air inlet 1212 is arranged close to the air inlet connecting port 1214, so that the air entering from the air inlet 1212 first enters the air inlet chamber 20 to mix with the gas, and then the mixed gas passes through the compression chamber 10 and enters the exhaust chamber 30. This can extend the mixing time of the air and gas in the pump chamber 121 and improve the mixing effect of the air and gas entering from the air inlet 1212; at the same time, setting the air inlet 1212 close to the air inlet connecting port 1214 is also beneficial to avoid the airflow that rebounds from the expansion chamber 131 to the pump chamber 121 when the rotor 211 rotates from the first position to the second position. It affects the intake at the air inlet 1212.

[0058] It is worth noting that in other embodiments, in the first direction, the air inlet 1212 can also be set to exhaust communication, that is, when the rotor 211 is in the second position, the air inlet 1212 and the exhaust communication port 1215 are located on the same side of the rotor 211. When the rotor 211 rotates from the first position to the second position, due to the rotation of the rotor 211, the air pressure in the pump chamber 121 is lower than the external pressure of the ejector tube body 1, so that external air enters the pump chamber 121 through the air inlet 1212.

[0059] The rotor 211 is a vane-shaped rotor 211 with two recessed portions on opposite sides along its width. Arc-shaped protrusions are formed on opposite sides along its length, smoothly connecting the recessed portions. When one rotor 211 is in the first position, the two arc-shaped protrusions are positioned adjacent to the ends of the adjacent cavity sidewall 1211, while the arc-shaped protrusion of the other rotor 211 abuts against a recessed portion of that rotor 211.

[0060] In one embodiment, the shaft 212 of one rotor 211 is connected to the drive motor 22, while the shaft 212 of the other rotor 211 is rotatably supported at both ends on the ejector tube 1. The rotor 211 connected to the drive motor 22 rotates to push the other rotor 211 in the opposite direction. This simplifies the structure of the exhaust assembly 2 and reduces the cost of driving the rotor assembly 21.

[0061] In other embodiments, the two rotors 211 are respectively a driving rotor 211 and a driven rotor 211. The rotating shaft 212 of the driving rotor 211 is connected to the drive motor 22, and a driving gear is sleeved on the rotating shaft 212 of the driving rotor 211, and a driven gear is sleeved on the rotating shaft 212 of the driven rotor 211. The driving gear and the driven gear are engaged to achieve linkage and opposite direction rotation of the two rotors 211.

[0062] It is worth noting that the structure of using one drive motor 22 to drive the two rotors 211 to rotate synchronously in opposite directions can refer to the linkage structure of the two rotors 211 in the existing Roots pump. This is not the focus of the present utility model and will not be described in detail here.

[0063] In one embodiment, in order to improve the smoothness of air intake and prevent the gas in the pump chamber 121 from being discharged to the outside through the air inlet 1212, an air intake portion 14 is convexly provided on the outer wall of the ejector tube, and the air intake portion 14 is provided with an air intake channel 141 connected to the air inlet 1212, thereby guiding the external air to flow into the pump chamber 121 through the air intake channel 141.

[0064] In one embodiment, the cross-sectional area of the air inlet channel 141 gradually increases in a direction away from the air inlet port 1212, so that when the air flows from the air inlet channel 141 to the air inlet port 1212, a negative pressure is formed at the air inlet port 1212, thereby forcing more air into the air inlet channel 141, further increasing the amount of air entering the pump chamber 121. At the same time, this arrangement can also better prevent the air in the pump chamber 121 from being discharged outside the pump chamber 121 through the air inlet channel 141, thereby preventing gas leakage within the pump chamber 121.

[0065] In one embodiment, the air intake channel 141 is arranged at an acute angle relative to the tangent direction of the air intake port 1212 to further ensure smooth air intake.

[0066] In one embodiment, the pump chamber 121 and the two air inlets 1212 are symmetrically arranged relative to a plane perpendicular to the second direction, thereby ensuring the consistency of the air intake volume of the two air inlets 1212, and further ensuring the consistency of the air volume ejected by the ejection structure during the operation of the vacuum component 2, thereby improving the ejection stability.

[0067] To facilitate installation of the rotor assembly 21, in one embodiment, the ejector tube includes a main body and a cover 15. The main body comprises a contraction tube portion 11, a mounting portion 12, and an expansion tube portion 13, which are sequentially connected along a first direction. The inner cavity of the contraction tube portion 11 forms a contraction cavity 111, and the inner cavity of the expansion tube portion 13 forms an expansion cavity 131. The mounting portion 12 has a mounting groove with one end open, which communicates with both the expansion cavity 131 and the contraction cavity 111. The cover 15 is removably mounted on the notch of the mounting groove. With this arrangement, the rotor assembly 21 can be installed and removed from the pump chamber 121 by removing the cover 15 from the mounting portion 12.

[0068] Furthermore, the cover 15 is disposed on a side of the mounting portion 12 away from the other ejector tube, so as to ensure that there is sufficient space for assembly and disassembly of the cover 15 and the rotor assembly 21 .

[0069] In one embodiment, a rotating shaft 212 extends out of the cover 15 and is connected to the drive motor 22. After the cover 15 is removed from the main pipe body, the rotor assembly 21 can be removed from the pump chamber 121 without removing the cover 15 and the drive motor 22, thereby improving the disassembly, assembly, maintenance and replacement efficiency of the vacuum assembly 2.

[0070] In order to further improve the installation convenience of the rotor 211, a positioning groove 1213 is opened on the cavity wall of the pump cavity 121 facing the cover 15. The positioning groove 1213 is arranged in a one-to-one correspondence with the rotating shaft 212. The end of the rotating shaft 212 away from the cover 15 is rotatably inserted into the positioning groove 1213, so that the groove wall of the positioning groove 1213 supports the end of the rotating shaft 212 away from the cover 15, thereby ensuring the installation stability and reliability of the rotating shaft 212 at the ejector tube, reducing the probability of deviation of the rotor 211 during movement, and improving the movement reliability of the rotor assembly 21.

[0071] Furthermore, positioning groove 1213 is formed by stamping the wall of pump chamber 121 outward. This increases the depth of positioning groove 1213 while maintaining the wall thickness of ejector tube 1, thereby improving the support stability of rotating shaft 212. A positioning ring is provided around positioning groove 1213 on the wall of pump chamber 121 to further increase the depth of positioning groove 1213, thereby increasing the mating length between rotating shaft 212 and ejector tube, ensuring the installation stability and reliability of rotor 211.

[0072] It is worth noting that the drive motor 22 is a variable frequency motor, which can adjust the rotation speed of the rotor 211 in the rotor assembly 21 according to the amount of gas and air required by the burner, thereby adjusting the air intake volume.

[0073] like Figure 1 and Figure 2 As shown, in one embodiment, the main body 200 and the ejection assembly 100 are detachably connected, so that the main body 200 and the ejection assembly 100 can be processed separately, reducing the overall processing difficulty of the furnace head.

[0074] To facilitate connection between the main body 200 and the ejection assembly 100, the ejection assembly 100 further includes a mounting portion 102. Both the outlet end of the inner and outer ring ejection tubes 101b and 101a are connected to the mounting portion 102, and the mounting portion 102 is detachably connected to the main body 200. Furthermore, a connecting bridge 103 is connected between the inlet end of the inner and outer ring ejection tubes 101b and 101a to ensure the accuracy of the relative position of the inner and outer ring ejection tubes 101b and 101a, preventing relative displacement between the two.

[0075] The mounting seat portion 102 has a first mating surface for mating with the main seat body 200. The first mating surface is provided with an outer ring ventilation groove, and the outer ring ventilation groove is connected to the outlet end of the diffusion chamber of the outer ring ejector tube 101a. The mounting seat portion 102 has an outer ring positioning ring portion arranged around the outer ring ventilation groove and an inner ring positioning ring portion arranged around the outlet end of the inner ring ejector channel. The main seat body 200 has a second mating surface for mating with the ejector assembly 100. The second mating surface is provided with an inner ring vent connected to the inner ring premixing chamber 201 and an outer ring vent connected to the outer ring premixing chamber 202, and the inner ring vent and the outer ring vent are separated. The first mating surface and the second mating surface are in contact with each other, the outer ring positioning ring portion is inserted into the outer ring vent, and the inner ring positioning ring portion is inserted at the inner ring vent to achieve communication between the inner ring ejector channel and the inner ring premixing chamber 201, and communication between the outer ring ejector channel and the outer ring premixing chamber 202.

[0076] The other structural settings of the burner head can be set with reference to the existing technology. This is not the focus of the present invention and will not be described in detail here.

[0077] This embodiment also provides a burner including the aforementioned burner head. By adopting the aforementioned burner head, the air intake during the burner combustion process can be increased, the mixing uniformity of air and gas can be improved, the probability of yellow flames being generated during combustion can be reduced, combustion stability and reliability can be improved, and exhaust gas generated during combustion can be reduced, thereby improving combustion safety.

[0078] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. An ejection structure, characterized in that: include: An ejector tube body (1), the ejector tube body (1) comprising a contraction cavity (111), a pump cavity (121), and an expansion cavity (131) sequentially arranged along a first direction, the cross-sectional areas of the contraction cavity (111) and the expansion cavity (131) gradually increasing in a direction away from the pump cavity (121), and air inlets (1212) are provided on two cavity side walls (1211) of the pump cavity (121) that are arranged opposite to each other along a second direction, the second direction being arranged at an angle to the first direction; The air extraction assembly (2) comprises a rotor assembly (21) and a drive motor (22), wherein the rotor assembly (21) comprises two rotors (211) rotatably mounted in the pump chamber (121), and the drive motor (22) is mounted on the outside of the ejector tube (1) and drives the rotor assembly (21) to rotate. The air extraction assembly (2) cooperates with the pump chamber (121) to form a Roots pump structure.

2. The ejection structure according to claim 1, characterized in that: The maximum width of the pump chamber (121) along the first direction is smaller than the maximum width of the pump chamber (121) along the second direction; an air intake communication port (1214) is formed at the connection between the pump chamber (121) and the contraction chamber (111); an air exhaust communication port (1215) is formed at the connection between the pump chamber (121) and the expansion chamber (131); and each of the chamber side walls (1211) is located between the air intake communication port (1214) and the air exhaust communication port (1215); The rotating shafts (212) of the two rotors (211) are arranged along a third direction, the first direction, the second direction and the third direction are perpendicular to each other, the rotating shafts (212) of the two rotors (211) are arranged opposite to each other and spaced apart in the second direction, and the rotation directions of the two rotors (211) are arranged in opposite directions.

3. The ejection structure according to claim 2, characterized in that: In the first direction, the air inlet (1212) is arranged close to the air inlet communication port (1214), and each of the rotors (211) is a vane-shaped rotor, and can be rotated and switched between a first position and a second position; When the rotor (211) is in the first position, the rotor (211) is arranged between the air intake communication port (1214) and the air exhaust communication port (1215) along the first direction, and the rotor (211) and the cavity side wall (1211) close to one side thereof enclose a compression chamber (10), and the compression chamber (10) is communicated with the corresponding air intake port (1212); When the rotor (211) is in the second position, the rotor (211) is disposed between the air intake communication port (1214) and the air exhaust communication port (1215) along the second direction, and the air intake communication port (1214) and the air intake port (1212) are located on the same side of the rotor (211) and are in communication with each other; The two rotors (211) are arranged in linkage and are preset to rotate in opposite directions, so that when one rotor (211) rotates to the first position, the other rotor (211) is located at the second position.

4. The ejection structure according to claim 1, characterized in that: The air inlet (1212) extends in a direction away from the pump chamber (121) and forms an air inlet channel (141), and the ventilation area of the air inlet channel (141) gradually increases in a direction away from the pump chamber (121); And / or, the pump chamber (121) and the two air inlets (1212) are symmetrically arranged relative to a plane perpendicular to the second direction.

5. The ejection structure according to any one of claims 1 to 4, characterized in that: The ejector tube body (1) comprises a main body and a cover (15), wherein the main body comprises a contraction tube portion (11), a mounting portion (12) and an expansion tube portion (13) connected in sequence along the first direction, wherein the inner cavity of the contraction tube portion (11) forms the contraction cavity (111), and the inner cavity of the expansion tube portion (13) forms the expansion cavity (131), and the mounting portion (12) has a mounting groove with one end open, wherein the mounting groove is connected to both the expansion cavity (131) and the contraction cavity (111), and the cover (15) is detachably covered on the notch of the mounting groove, and the cover (15) and the mounting portion (12) are arranged to form the pump cavity (121).

6. The ejection structure according to claim 5, characterized in that: Each of the rotors (211) is rotatably mounted on the ejector tube body (1) via a rotating shaft (212). One of the rotating shafts (212) extends out of the cover (15) and is connected to the driving motor (22).

7. The ejection structure according to claim 6, characterized in that: A positioning groove (1213) is provided on the cavity wall of the pump cavity (121) facing the sealing cover (15). The positioning groove (1213) is arranged in a one-to-one correspondence with the rotating shaft (212). The end of the rotating shaft (212) away from the sealing cover (15) is rotatably installed in the positioning groove (1213).

8. A burner head, comprising an inner ring ejector tube (101b) and an outer ring ejector tube (101a), characterized in that: At least the outer ring ejector tube (101a) adopts the ejection structure as described in any one of claims 1 to 7.

9. The burner according to claim 8, characterized in that: The burner head further comprises a main body (200), wherein the main body (200) comprises an inner ring premixing cavity (201) and an outer ring premixing cavity (202); A mounting seat portion (102) is connected between the gas outlet ends of the inner ring ejector tube (101b) and the outer ring ejector tube (101a); the mounting seat portion (102) is detachably connected to the main seat body (200); the inner cavity of the outer ring ejector tube (101a) is in communication with the outer ring premixing cavity (202); and the inner cavity of the inner ring ejector tube (101b) is in communication with the inner ring premixing cavity (201).

10. A burner, characterized in that: Comprising a burner according to any one of claims 8 or 9.

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