Annular air inlet burner and gas stove

Abstract

The invention provides an annular air inlet burner and a gas stove, the annular air inlet burner comprises an ejector and a valve body, the air inlet end of the ejector is provided with a limiting plate, the limiting plate is provided with an air inlet and a positioning port, and the positioning port is coaxially matched with a nozzle on the valve body and used for positioning the nozzle on the valve body. The limiting plate is arranged at the air inlet end of the ejector, the positioning effect between the ejector and the nozzle is improved, particularly, the axial positioning effect between the ejector and the nozzle is improved, the situation that the length of the portion, stretching into the ejector, of the nozzle is too long or too short is avoided, meanwhile, the coaxiality between the nozzle and the ejector can be guaranteed, and therefore the service life of the ejector is prolonged. And the ejection effect of the ejector on primary air can be ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of kitchen appliances, and in particular relates to a burner with an annular air inlet, and also relates to a gas stove equipped with the burner with an annular air inlet. Background Art

[0002] Gas stoves are common kitchen appliances in people's daily lives. Gas stoves generate flames through burners. The burners spray gas into the injection tube through gas nozzles. The gas is fully mixed with primary air. The mixed gas is then provided to the fire cover of the burner and mixed with secondary air to generate flames.

[0003] The ejector is an important part of the gas stove. Its main function is to mix the gas and air in a certain proportion and then transport them to the burner for ignition. In order to improve the ejector's ejection effect on primary air and the uniformity of mixing primary air and gas, the damper adjustment structure gradually adopts a circular air intake scheme. Specifically, the damper adjustment plate is spaced apart from the air inlet end of the ejector, and the primary air is ejected from the peripheral side of the gap between the damper adjustment plate and the air inlet end of the ejector into the inlet of the contraction section of the ejector tube. The operator changes the ejection amount of the primary air by adjusting the distance between the damper adjustment plate and the air inlet end of the ejector.

[0004] For example, a Chinese utility model patent with application number CN202222266249.X discloses a burner and a gas stove including the same, wherein the burner comprises an ejector tube and a plug-in valve, the nozzle of the plug-in valve being inserted into the ejector tube, a damper being sleeved on the nozzle, a positioning column being arranged at one end of the ejector tube close to the plug-in valve, the positioning column having a first side wall opposite to the outer peripheral wall of the damper, the curvature of at least a portion of the curved surface of the first side wall being consistent with the curvature of the curved surface of the outer peripheral wall of the damper.

[0005] However, the existing ejector tube and plug-in valve are usually fixed in the shell of the gas stove by screws respectively. During the installation process, the positioning effect between the nozzle of the plug-in valve and the ejector tube is poor. Due to installation errors and / or deformation of the shell of the gas stove, the length of the nozzle of the plug-in valve extending into the ejector tube is too long or too short, thereby causing the ejection performance to decrease, reducing the primary air volume, and affecting the smoke and energy efficiency of the combustion system.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The present invention provides a burner with an annular air inlet. By arranging a limit plate at the air inlet end of the ejector, the positioning effect between the ejector and the nozzle is improved, and the problem of poor ejection performance of the existing burner with annular air inlet caused by the nozzle extending too long or too short into the ejector is solved.

[0008] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0009] A burner with an annular air inlet comprises an ejector and a valve body. A limit plate is arranged on the air inlet end of the ejector. An air inlet and a positioning port are arranged on the limit plate. The positioning port is coaxially matched with a nozzle on the valve body and is used to position the nozzle on the valve body.

[0010] Furthermore, the nozzle end is plugged into the positioning port, and an axial positioning structure is provided between the nozzle end and the positioning port;

[0011] Preferably, an abutment portion is provided on the side of the positioning port facing the ejector, for abutting against the end face of the nozzle; or an abutment surface is provided on the nozzle, and the abutment surface abuts against the side of the limiting plate away from the ejector;

[0012] Preferably, the end surface of the nozzle is flush with the inlet of the contraction section of the ejector;

[0013] Preferably, the end of the nozzle is provided with a plug connector whose outer diameter matches the inner diameter of the positioning opening, and the abutment surface is arranged around an end of the plug connector away from the ejector.

[0014] Further, the limiting plate is fixedly connected to the air inlet end of the ejector, or the limiting plate is clamped between the abutting surface and the end surface of the air inlet end of the ejector, and a limiting portion is arranged around the outer edge of the limiting plate on the air inlet end of the ejector;

[0015] Preferably, the limiting plate extends in the radial direction of the ejector.

[0016] Furthermore, the ejector includes a first ejector and a second ejector arranged in parallel, and the inlets of the contraction sections of the first ejector and the second ejector are flush; the limiting plate covers the inlets of the contraction sections of the first ejector and the second ejector, and abuts against the portion between the inlets of the contraction sections of the first ejector and the second ejector.

[0017] Furthermore, a boss is provided between the inlet of the contraction section of the first ejector and the second ejector, the boss protrudes toward the side close to the valve body, and the limit plate abuts against the boss;

[0018] The outer edge of the limiting plate is aligned with the inlet of the contraction section of the first ejector and the second ejector; the limiting portion is annular and extends around the inlet of the contraction section of the first ejector and the second ejector and the edge of the boss;

[0019] Preferably, the limiting portion is provided with an outwardly protruding limiting groove, and the outer edge of the limiting plate is provided with a limiting protrusion that cooperates with the limiting groove.

[0020] Furthermore, the installation position of the nozzle on the valve body is adjustable, and the nozzle can be extended or shortened relative to the valve body;

[0021] Preferably, the output pipe of the valve body is coaxial with the ejector, and the nozzle at least partially extends into the output pipe and is threadedly connected to the output pipe.

[0022] Further, the air inlet is arranged around the positioning opening;

[0023] Preferably, the air inlet is arranged in an arc shape extending around the axis of the positioning opening;

[0024] Preferably, the air inlet is provided with a plurality of air inlets arranged at intervals around the axis of the positioning port, and the portion of the limit plate located between two adjacent air inlets constitutes a connecting portion; or, the air inlet is provided with one C-shaped air inlet, and the portion of the limit plate located between the two ends of the air inlet constitutes a connecting portion.

[0025] Further, the two ends of the C-shaped air inlet are parallel to each other, and the connecting portion extends along the radial direction of the ejector;

[0026] Preferably, the limiting plate is provided with two C-shaped air inlets corresponding to the inlets of the contraction sections of the first ejector and the second ejector, respectively, and the two C-shaped air inlets are arranged opposite to each other;

[0027] Preferably, the arc angle of the outer circumference of the C-shaped air inlet is greater than 270° and less than 360°.

[0028] Furthermore, the damper adjustment plate and the limit plate sleeved on the nozzle are arranged opposite to each other, and a primary air inlet is formed between the damper adjustment plate and the limit plate, and the primary air inlet is connected to the air inlet;

[0029] Preferably, the damper adjustment plate is coaxial with the ejector, and the damper adjustment plate is threadedly matched with the nozzle;

[0030] Preferably, anti-slip teeth are provided on the outer edge of the damper adjustment plate.

[0031] The present invention also provides a gas stove, comprising the above-mentioned annular air inlet burner;

[0032] Preferably, the valve body and the ejector are connected to the outer shell of the gas stove by screws respectively.

[0033] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0034] 1. The present invention improves the positioning effect between the ejector and the nozzle by arranging a limit plate at the air inlet end of the ejector, especially improves the axial positioning effect between the ejector and the nozzle, avoids the nozzle extending into the ejector too long or too short, and at the same time, can ensure the coaxiality between the nozzle and the ejector, thereby ensuring the ejection effect of the ejector on the primary air.

[0035] 2. The present invention provides a limit plate clamped between the abutting surface of the nozzle and the end surface of the air inlet end of the ejector, so that there is no need to set connecting parts such as screws between the limit plate and the ejector, which is beneficial to improving the installation efficiency of the burner with annular air inlet. At the same time, the limit plate can block the nozzle to prevent the nozzle from extending too long into the ejector. Moreover, when the nozzle extends too short into the ejector, the limit plate will become loose, which is beneficial for the operator to promptly discover and adjust the relative position of the ejector and the nozzle.

[0036] 3. The present invention arranges the nozzle to be extended or shortened relative to the valve body. When there is a deviation in the length of the nozzle extending into the ejector, the matching accuracy between the nozzle and the ejector can be improved by adjusting the extended length of the nozzle, thereby ensuring the ejection effect of the ejector.

[0037] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0039] Figure 1 An assembly diagram of a burner in an embodiment of the present invention;

[0040] Figure 2 For the embodiment of the present invention Figure 1 The enlarged view of point A in the middle;

[0041] Figure 3 is a schematic cross-sectional view of a burner along a horizontal direction in an embodiment of the present invention;

[0042] Figure 4 For the embodiment of the present invention Figure 3 The enlarged view of point B in the middle;

[0043] Figure 5 Schematic diagram of the coordination structure between the limit plate and the ejector in an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of the structure of the air inlet end of the ejector in an embodiment of the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of the limiting plate in an embodiment of the present invention;

[0046] Figure 8 Schematic diagram of the structure of the nozzle in the embodiment of the present invention.

[0047] Description of the main components in the figure: 1. Ejector; 11. Contraction section; 111. Inlet of contraction section; 12. Mixing section; 13. Diffusion section; 14. Limiting part; 141. Limiting groove; 15. Boss; 2. Burner head; 3. Limiting plate; 31. Air inlet; 32. Positioning port; 33. Connecting part; 34. Limiting protrusion; 4. Valve body; 41. Nozzle; 411. Main body; 412. Plug connector; 413. Threaded head; 42. Output pipe; 43. Abutment surface; 5. Primary air inlet; 6. Air damper adjustment plate; 61. Arc-shaped guide surface.

[0048] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0050] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Embodiment 1

[0053] like Figures 1 to 8As shown, in an embodiment of the present invention, a burner with an annular air inlet is introduced, and the burner with an annular air inlet includes an ejector 1 and a valve body 4. The ejector 1 is installed on the burner head 2 of the annular air inlet burner, and the air outlet end of the ejector 1 is connected with the gas mixing chamber of the burner head 2. The valve body 4 is arranged opposite to the air inlet end of the ejector 1. The nozzle 41 on the valve body 4 is inserted into the air inlet end of the ejector 1, and is used for spraying gas into the air inlet end of the ejector 1 when the valve body 4 is opened, and at the same time, injecting primary air into the ejector 1.

[0054] The damper adjustment plate 6 is spaced apart from the air inlet end of the ejector 1, and primary air is injected into the inlet 111 of the contraction section of the ejector 1 from the peripheral side of the gap between the damper adjustment plate 6 and the air inlet end of the ejector 1. The operator changes the injection amount of primary air by adjusting the distance between the damper adjustment plate 6 and the air inlet end of the ejector 1.

[0055] That is, the gap between the damper adjustment plate 6 and the air inlet end of the ejector 1 constitutes the primary air inlet 5.

[0056] In some specific embodiments, the ejector 1 includes a contraction section 11 and a mixing section 12 which are sequentially arranged from the air inlet end to the air outlet end, the inner diameter of the contraction section 11 gradually decreases in the direction approaching the air outlet end, the mixing section 12 extends from the outlet of the contraction section 11, and the inner diameter of the mixing section 12 is the same as the inner diameter of the outlet of the contraction section 11.

[0057] The high-speed and high-energy flow of gas output by the nozzle bursts into the mixing section 12 through the contraction section 11, and the surrounding air is sucked into the mixing section 12 by the jet volume and mixed with the gas.

[0058] In some possible embodiments, the air outlet end of the mixing section 12 is further provided with a diffusion section 13, the inlet inner diameter of the diffusion section 13 is the same as the inner diameter of the outlet of the mixing section 12, and the inner diameter of the diffusion section 13 gradually increases in the direction close to the air outlet end of the ejector body 411 so as to reduce the flow velocity and increase the static pressure.

[0059] like Figures 1 to 5 As shown, in this embodiment, a limiting plate 3 is provided at the air inlet end of the ejector 1, and a positioning port 32 coaxial with the ejector 1 and an air inlet 31 extending around the positioning port 32 are provided on the limiting plate 3, and the positioning port 32 is used to position the nozzle 41 on the valve body 4. Specifically, the limiting plate 3 can cover the inlet 111 of the contraction section of the ejector 1, and the inlet 111 of the contraction section of the ejector 1 is connected to the outside through the air inlet 31 and the positioning port 32, and the nozzle 41 of the valve body 4 is inserted in the positioning port 32. When the nozzle 41 sprays gas into the ejector 1, the ejector 1 injects primary air into the ejector 1 through the primary air inlet 5 and the air inlet 31.

[0060] In the present embodiment, by providing a limit plate 3 at the air inlet end of the ejector 1, the positioning effect between the ejector 1 and the nozzle 41 is improved, the influence of the installation error between the ejector 1 and the valve body 4 is eliminated, and the length of the nozzle 41 extending into the ejector 1 too long or too short during the installation process is avoided. Moreover, during the transportation or long-term use of the gas stove, the length of the nozzle 41 extending into the ejector 1 too long or too short due to the deformation of the outer shell of the gas stove can be avoided. At the same time, the coaxiality between the nozzle 41 and the ejector 1 can also be ensured, thereby ensuring the ejection effect of the ejector 1 on the primary air.

[0061] In this embodiment, the end of the nozzle 41 is plugged into the positioning port 32 along a direction close to the ejector 1 , and an axial positioning structure is provided between the end of the nozzle 41 and the positioning port 32 .

[0062] In some possible embodiments, abutment is provided on the side of the positioning port 32 facing the ejector 1, for abutting against the end face of the nozzle 41. Specifically, the abutment may be a limiting rib or a pressure profile provided on the side of the limiting plate facing the ejector, the limiting rib or pressure profile being provided around the positioning port, for abutting against the end face of the nozzle 41 after the nozzle is inserted into the positioning port to a preset position, so as to axially position the nozzle.

[0063] In some other possible embodiments, an abutting surface 43 is provided on the nozzle 41 , and the abutting surface 43 abuts against a side of the limiting plate 3 away from the ejector 1 .

[0064] like Figure 8 As shown, in some specific embodiments, the end of the nozzle 41 is provided with a plug connector 412 whose outer diameter is adapted to the inner diameter of the positioning port 32, and the outer periphery of the plug connector 412 is provided with an abutment surface 43, which is used to abut against the side of the limit plate 3 away from the ejector 1.

[0065] Preferably, in this embodiment, the end surface of the nozzle 41 is flush with the inlet 111 of the contraction section of the ejector 1 .

[0066] Specifically, it is verified through experiments that when the end face of the nozzle 41 is flush with the inlet 111 of the contraction section of the ejector 1, the ejection effect of the primary air is best. Therefore, the position where the end face of the nozzle 41 is flush with the inlet 111 of the contraction section of the ejector 1 is used as the set position for the installation of the nozzle 41 and the ejector 1.

[0067] Preferably, the end of the nozzle 41 is provided with a plug connector 412 whose outer diameter matches the inner diameter of the positioning opening 32, and the abutment surface 43 is provided around the end of the plug connector 412 away from the ejector 1. The plug connector 412 is inserted into the positioning opening 32, and the end surface of the plug connector 412 is flush with the inlet 111 of the contraction section of the ejector 1.

[0068] In some preferred embodiments, the nozzle 41 includes a main body 411 and a plug connector 412, the plug connector 412 is coaxially arranged at one end of the main body 411 close to the ejector 1, the outer diameter of the plug connector 412 is equal to the inner diameter of the positioning port 32, the outer diameter of the main body 411 is larger than the outer diameter of the plug connector 412, and the end surface of the main body 411 close to the ejector 1 constitutes the abutment surface 43 of the nozzle 41, and the abutment surface 43 is arranged around the plug connector 412. When the relative position between the nozzle 41 and the ejector 1 is the set position, the abutment surface 43 abuts against the limit plate 3, and the limit plate is clamped between the nozzle 41 and the air inlet end of the ejector 1.

[0069] Preferably, in this embodiment, the outer diameter of the plug connector 412 at one end close to the ejector 1 gradually decreases in the direction close to the ejector 1, so that the plug connector 412 can be easily inserted into the positioning port 32 during installation.

[0070] In this embodiment, the limiting plate 3 extends along the radial direction of the ejector 1 .

[0071] In some possible embodiments, the limit plate 3 is fixedly connected to the air inlet end of the ejector 1. Specifically, it can be detachably installed on the air inlet end of the ejector 1 by means of screws, bolts and other connecting parts. The limit plate 3 can also be welded or bonded to the air inlet end of the ejector 1. The limit plate 3 and the ejector 1 can also be set as an integral part.

[0072] In some other possible embodiments, the limit plate 3 is sandwiched between the abutment surface 43 of the nozzle 41 and the end surface of the air inlet end of the ejector 1, and a limit portion 14 is provided on the air inlet end of the ejector 1 around the outer edge of the limit plate 3. Thus, it is possible to prevent the nozzle 41 from extending too long into the ejector 1. At the same time, when the nozzle 41 extends too short into the ejector 1, the limit plate 3 will become loose, so that the operator can determine whether the relative position between the nozzle 41 and the ejector 1 is the set position by checking the condition of the limit plate 3, and make adjustments accordingly.

[0073] In particular, after the gas stove is transported over a long distance, when it is installed in the user's home, and after the gas stove has been used for a long time, the operator can determine whether the relative position between the nozzle 41 and the ejector 1 is the set position by judging whether the limit plate 3 is loose. When the limit plate 3 is loose or even falls off, the operator can adjust the installation position of the ejector 1 and / or the valve body 4 in the outer shell of the gas stove to correct the relative position between the nozzle 41 and the ejector 1, thereby ensuring the ejector 1's ejection effect on the primary air and ensuring the working stability of the burner with annular air inlet.

[0074] In this embodiment, the end surface of the air inlet end of the ejector 1 can be flush with the inlet 111 of the contraction section, or can protrude outward relative to the inlet 111 of the contraction section.

[0075] The “end face of the air inlet end of the ejector 1 protrudes outwardly relative to the inlet 111 of the contraction section” specifically means that the air inlet end of the ejector 1 is provided with a boss 15 protruding and extending around the inlet 111 of the contraction section, and the boss 15 protrudes along the axial direction of the ejector 1, and the end face of the boss 15 constitutes the end face of the air inlet end of the ejector 1.

[0076] The boss 15 can be in a circular ring shape, an arc shape, or an irregular shape, as long as the side of the boss 15 facing the axis of the ejector 1 is coaxial with the inlet 111 of the contraction section and has the same inner diameter.

[0077] In this embodiment, the limiting portion 14 is annular, and the inner periphery of the limiting portion 14 is in contact with the outer edge of the limiting plate 3. Thus, a mounting groove is formed at the air inlet end of the ejector 1, the limiting portion 14 constitutes the groove wall of the mounting groove, and the end surface of the air inlet end of the ejector 1 constitutes the groove bottom of the mounting groove.

[0078] In this embodiment, the limiting portion 14 is provided with a limiting groove 141 protruding outward, specifically, the limiting groove 141 protrudes toward the periphery of the surrounding range of the limiting portion 14, and the outer edge of the limiting portion 14 is provided with a limiting protrusion 34 that cooperates with the limiting groove 141. By providing the limiting groove 141 and the limiting protrusion 34 that cooperate with each other, the positioning effect of the limiting plate 3 can be improved.

[0079] In this embodiment, the limiting portion 14 is used to limit the limiting plate 3 to ensure the coaxiality between the positioning port 32 and the ejector 1 .

[0080] In some possible embodiments, the limit plate 3 is configured as a circular structure coaxial with the ejector 1, the outer diameter of the limit plate 3 is larger than the inner diameter of the inlet 111 of the contraction section, and the limit portion 14 protrudes axially around the outer edge of the limit plate 3 along the ejector 1.

[0081] In this embodiment, a plurality of ejectors 1 are provided, and a limiting plate 3 is provided at the air inlet end of each ejector 1 for limiting the corresponding nozzle 41 .

[0082] In some other possible embodiments, the ejector 1 includes a first ejector and a second ejector arranged in parallel, and the inlets 111 of the contraction sections of the first ejector and the second ejector are flush; the limiting plate 3 covers the inlet 111 of the contraction sections of the first ejector and the second ejector, and the middle part of the limiting plate 3 abuts against the part between the inlet 111 of the contraction sections of the first ejector and the second ejector.

[0083] Specifically, the portion between the inlet 111 of the first ejector and the second ejector contraction section is used to support the limit plate 3, and the other portion of the air inlet end of the ejector 1 does not support the limit plate 3. Therefore, the limit plate 3 will remain stable only when the two nozzles 41 and the corresponding ejectors 1 are in the set position, and the limit plate 3 will become loose when the relative position between one nozzle 41 and the corresponding ejector 1 deviates.

[0084] Preferably, a boss 15 is provided between the inlet 111 of the contraction section of the first ejector and the second ejector, the boss 15 protrudes toward the side close to the valve body 4, and the limit plate 3 abuts against the boss 15. The outer edge of the limit plate 3 is aligned with the inlet 111 of the contraction section of the first ejector and the second ejector; the limit portion 14 is annular and extends around the inlet 111 of the contraction section of the first ejector and the second ejector and the edge of the boss 15. The provision of the boss 15 can enlarge the range of motion of the limit plate 3.

[0085] Specifically, the nozzle 41 that cooperates with the first ejector on the left is the first nozzle 41, and the nozzle 41 that cooperates with the second ejector on the right is the second nozzle 41. When the length of the first nozzle 41 extending into the first ejector is too short, the limit plate 3 can rotate around the boss 15, the left side of the limit plate 3 can rotate toward the outside of the first ejector, and the right side of the limit plate 3 can rotate toward the inside of the second ejector. When the length of the first nozzle 41 extending into the first ejector is too long, the left side of the limit plate 3 rotates toward the inside of the first ejector, and the right side of the limit plate 3 rotates toward the outside of the second ejector. Thus, the operator can judge which nozzle 41 has not reached the set position relative to the ejector 1 according to the tilt direction of the limit plate 3, so as to make adjustments.

[0086] Preferably, in this embodiment, the limiting portion 14 is provided with an outwardly protruding limiting groove 141 , and the outer edge of the limiting plate 3 is provided with a limiting protrusion 34 that cooperates with the limiting groove 141 .

[0087] like Figures 1 to 4 As shown, in this embodiment, the air inlet ends of the first ejector and the second ejector are connected as a whole, the inlets 111 of the contraction sections of the first ejector and the second ejector are arranged side by side in the horizontal direction, and the inlets 111 of the contraction sections of the first ejector and the second ejector are spaced from each other.

[0088] The boss 15 is arranged between the inlet 111 of the contraction section of the first ejector and the second ejector, and the left and right sides of the boss 15 are arc surfaces extending around the inlet 111 of the contraction section of the first ejector and the second ejector, that is, the inner diameters of the arc surfaces on the left and right sides are the same as the inner diameters of the inlet 111 of the contraction section of the first ejector and the second ejector.

[0089] The outer edge of the portion of the limiting plate 3 located on the left and right sides of the boss 15 is aligned with the inlet 111 of the contraction section of the first ejector and the second ejector, and the limiting portion 14 is arranged around the inlet 111 of the contraction section of the first ejector and the second ejector and the edges of the upper and lower ends of the boss 15.

[0090] Limiting protrusions 34 protruding outward are provided at the edges of the upper and lower ends of the boss 15 , and limiting grooves 141 are provided on the limiting portion 14 corresponding to the limiting protrusions 34 .

[0091] In some preferred embodiments, the installation position of the nozzle 41 on the valve body 4 is adjustable, and the nozzle 41 can be extended or shortened relative to the valve body 4. Therefore, when the length of the nozzle 41 extending into the ejector 1 deviates, the matching accuracy of the nozzle 41 and the ejector 1 can be improved by adjusting the extended length of the nozzle 41, thereby ensuring the ejection effect of the ejector 1.

[0092] In some specific embodiments, the output pipe 42 of the valve body 4 is coaxial with the ejector 1, and the nozzle 41 at least partially extends into the output pipe 42 and is threadedly connected to the output pipe 42. The operator can adjust the length of the nozzle 41 extending into the ejector 1 by rotating the nozzle 41.

[0093] Specifically, a threaded head 413 is coaxially arranged at one end of the nozzle 41 away from the ejector 1 , an outer wall of the threaded head 413 is provided with an outer thread, and an inner wall of the output pipe 42 of the valve body 4 is provided with an inner thread matching the outer thread on the threaded head 413 .

[0094] In this embodiment, a sealing ring is provided on the outer periphery of the threaded head 413 to seal the gap between the threaded head 413 and the output pipe 42 in the radial direction.

[0095] In this embodiment, during the installation of the burner, or when the relative position of the nozzle 41 and the ejector 1 deviates, the operator can make a rough adjustment to the relative position of the nozzle 41 and the ejector 1 by adjusting the installation position of the valve body 4 and the ejector 1, and then make a fine adjustment to the relative position of the nozzle 41 and the ejector 1 by adjusting the extension length of the nozzle 41 relative to the valve body 4, so that the end of the nozzle 41 is precisely aligned with the inlet 111 of the contraction section of the ejector 1.

[0096] In this embodiment, the air inlet 31 is configured to be in an arc shape extending around the axis of the ejector 1 .

[0097] In this embodiment, the air inlet 31 and the positioning port 32 divide the limiting plate 3 into a first limiting ring, a second limiting ring coaxially arranged on the inner circumference of the first limiting ring, and a connecting portion 33 connected between the first limiting ring and the second limiting ring. The second limiting ring is used to position the nozzle 41.

[0098] In some possible embodiments, a plurality of air inlets 31 are arranged at intervals around the axis of the ejector 1 , and the portion of the limiting plate 3 between two adjacent air inlets 31 constitutes a connecting portion 33 , and the number of the connecting portions 33 is the same as the number of the air inlets 31 .

[0099] In some other possible embodiments, the air inlet 31 is provided with one C-shaped one, and the portion of the limiting plate 3 located between the two ends of the air inlet 31 constitutes a connecting portion 33. In this embodiment, there is one connecting portion 33.

[0100] In this embodiment, by setting the air inlet 31 to be C-shaped, the air inlet area of ​​the air inlet 31 can be expanded to ensure the effect of primary air injection.

[0101] Preferably, in this embodiment, the diameter of the outer circumference of the C-shaped air inlet 31 is close to the inner diameter of the inlet 111 of the contraction section of the ejector 1, and is smaller than the inner diameter of the inlet 111 of the contraction section of the ejector 1; the diameter of the inner circumference of the C-shaped air inlet 31 is close to the inner diameter of the positioning port 32, and is larger than the inner diameter of the positioning port 32.

[0102] Preferably, in this embodiment, two ends of the C-shaped air inlet 31 are parallel to each other, and the connecting portion 33 extends along the radial direction of the ejector 1 .

[0103] The limiting plate 3 is provided with two C-shaped air inlets 31 corresponding to the inlets 111 of the contraction sections of the first ejector and the second ejector respectively, and the two C-shaped air inlets 31 are arranged opposite to each other.

[0104] Specifically, two C-shaped air inlets 31 are arranged opposite to each other, and the two C-shaped air inlets 31 form two connecting parts 33 on the limiting plate 3. By arranging the two C-shaped air inlets 31 opposite to each other, the two connecting parts 33 are both connected to the middle part of the limiting plate 3, which can ensure the supporting strength of the nozzle 41.

[0105] Preferably, the two connecting portions 33 formed by the two C-shaped air inlets 31 are collinear, and both connecting portions 33 are connected to a portion of the limiting plate 3 located between the inlet 111 of the contraction section of the first ejector and the second ejector.

[0106] Preferably, the extending direction of the connecting portion 33 is perpendicular to the extending direction of the boss 15 .

[0107] Preferably, the arc angle of the outer circumference of the C-shaped air inlet 31 is greater than 270° and less than 360°.

[0108] In this embodiment, the damper adjustment plate 6 is sleeved on the nozzle 41 , and the damper adjustment plate 6 is arranged opposite to the limit plate 3 , a primary air inlet 5 is formed between the damper adjustment plate 6 and the limit plate 3 , and the primary air inlet 5 is connected to the air inlet 31 .

[0109] In some specific embodiments, the outer diameter of the damper adjustment plate is greater than the outer diameter of the air inlet 31 .

[0110] Preferably, an arc-shaped guide surface 61 is provided on the side of the damper adjustment plate 6 facing the ejector 1, and the arc-shaped guide surface 61 is provided close to the outer edge of the damper adjustment plate 6, and the arc-shaped guide surface 61 bends and extends toward the side close to the ejector 1 along the direction close to the axis of the damper adjustment plate 6.

[0111] Preferably, the outer diameter of the arc-shaped guide surface 61 is larger than the inner diameter of the air inlet end, and the inner diameter of the arc-shaped guide surface 61 is smaller than the inner diameter of the air inlet end. The arrangement of the arc-shaped guide surface 61 can make the flow path of the primary air bend toward the inside of the ejector 1, thereby improving the guiding effect of the primary air and avoiding turbulence.

[0112] Preferably, the damper adjustment plate 6 is coaxial with the ejector 1 , and the damper adjustment plate 6 is threadedly matched with the nozzle 41 , so that the operator can adjust the size of the primary air inlet 5 by rotating the damper adjustment plate 6 .

[0113] Preferably, the outer edge of the damper adjustment plate 6 is provided with anti-slip teeth.

[0114] In this embodiment, the setting of the limit plate 3 can not only ensure the positioning effect of the nozzle 41, but also avoid blocking the outer peripheral side of the air door adjustment plate 6, making the air door adjustment plate 6 easier for operators to adjust.

[0115] Embodiment 2

[0116] This embodiment provides a gas stove, which includes a shell, and the burner with an annular air inlet in the above-mentioned embodiment 1 is installed in the shell.

[0117] In this embodiment, the valve body 4 and the ejector 1 are connected to the housing of the gas stove by screws, and the installation position of the valve body 4 and / or the ejector 1 in the housing is adjustable. Therefore, the operator can adjust the relative position of the nozzle 41 and the ejector 1 by adjusting the installation position of the valve body 4 and / or the ejector 1 in the housing.

[0118] In some possible embodiments, during the installation of the burner with an annular air inlet, the valve body 4 is first fixed in the shell, and then the ejector 1 is installed. During the installation, the limit plate 3 is mounted on the nozzle 41 through the positioning port 32.

[0119] In some other possible embodiments, during the installation of the burner with an annular air inlet, the ejector 1 is first fixed in the housing, and then the valve body 4 is installed. During the installation, the nozzle 41 is inserted into the positioning hole 32 of the limit plate 3.

[0120] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the present invention can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A burner with an annular air inlet, comprising an ejector (1) and a valve body (4), characterized in that: A limit plate (3) is provided at the air inlet end of the ejector (1), and an air inlet (31) and a positioning port (32) are provided on the limit plate (3). The positioning port (32) is coaxially matched with the nozzle (41) on the valve body (4) and is used to position the nozzle (41) on the valve body (4).

2. The burner with annular air inlet according to claim 1, characterized in that: The end of the nozzle (41) is plugged into the positioning opening (32), and an axial positioning structure is provided between the end of the nozzle (41) and the positioning opening (32); Preferably, a side of the positioning opening (32) facing the ejector (1) is provided with an abutment portion for abutting against an end surface of the nozzle (41); or, a nozzle (41) is provided with an abutment surface (43), and the abutment surface (43) abuts against a side of the limiting plate (3) away from the ejector (1); Preferably, the end surface of the nozzle (41) is flush with the inlet (111) of the contraction section of the ejector (1); Preferably, the end of the nozzle (41) is provided with a plug connector (412) whose outer diameter matches the inner diameter of the positioning opening (32), and the abutment surface (43) is arranged around an end of the plug connector (412) away from the ejector (1).

3. The burner with annular air inlet according to claim 2, characterized in that: The limit plate (3) is fixedly connected to the air inlet end of the ejector (1), or the limit plate (3) is clamped between the abutment surface (43) and the end surface of the air inlet end of the ejector (1), and a limit portion (14) is provided on the air inlet end of the ejector (1) around the outer edge of the limit plate (3).

4. The burner with annular air inlet according to claim 3, characterized in that: The ejector (1) comprises a first ejector and a second ejector arranged in parallel, and the inlets (111) of the contraction sections of the first ejector and the second ejector are flush; the limiting plate (3) covers the inlets (111) of the contraction sections of the first ejector and the second ejector, and abuts against the portion between the inlets (111) of the contraction sections of the first ejector and the second ejector.

5. The burner with annular air inlet according to claim 4, characterized in that: A boss (15) is provided between the inlet (111) of the contraction section of the first ejector and the second ejector, the boss (15) protrudes toward a side close to the valve body (4), and the limiting plate (3) abuts against the boss (15); The outer edge of the limiting plate (3) is aligned with the inlet (111) of the contraction section of the first ejector and the second ejector; The limiting portion (14) is annular and extends around the inlet (111) of the contraction section of the first ejector and the second ejector and the edge of the boss (15); Preferably, the limiting portion (14) is provided with an outwardly protruding limiting groove (141), and the outer edge of the limiting plate (3) is provided with a limiting protrusion (34) that cooperates with the limiting groove (141).

6. The burner with annular air inlet according to any one of claims 3 to 5, characterized in that: The installation position of the nozzle (41) on the valve body (4) is adjustable, and the nozzle (41) can be extended or shortened relative to the valve body (4); Preferably, the output pipe (42) of the valve body (4) is coaxial with the ejector (1), and the nozzle (41) at least partially extends into the output pipe (42) and is threadedly connected to the output pipe (42).

7. The burner with annular air inlet according to any one of claims 1 to 5, characterized in that: The air inlet (31) is arranged around the positioning opening (32); Preferably, the air inlet (31) is arranged in an arc shape extending around the axis of the positioning opening (32); Preferably, the air inlet (31) is provided with a plurality of limit plates (3) arranged at intervals around the axis of the positioning opening (32), and the portion of the limit plate (3) located between two adjacent air inlets (31) constitutes a connecting portion (33); or, the air inlet (31) is provided with one C-shaped limit plate (3), and the portion of the limit plate (3) located between the two ends of the air inlet (31) constitutes the connecting portion (33).

8. The burner with annular air inlet according to claim 7, characterized in that: The two ends of the C-shaped air inlet (31) are parallel to each other, and the connecting portion (33) extends in the radial direction of the ejector (1); Preferably, the limiting plate (3) is provided with two C-shaped air inlets (31) corresponding to the inlets (111) of the contraction sections of the first ejector and the second ejector, respectively, and the two C-shaped air inlets (31) are arranged opposite to each other; Preferably, the arc angle of the outer circumference of the C-shaped air inlet (31) is greater than 270° and less than 360°.

9. The burner with annular air inlet according to any one of claims 1 to 5, characterized in that: The damper adjustment plate (6) sleeved on the nozzle (41) is arranged opposite to the limit plate (3), a primary air inlet (5) is formed between the damper adjustment plate (6) and the limit plate (3), and the primary air inlet (5) is connected to the air inlet (31); Preferably, the damper adjustment plate (6) is coaxial with the ejector (1), and the damper adjustment plate (6) is threadedly matched with the nozzle (41); Preferably, the outer edge of the damper adjustment plate (6) is provided with anti-slip teeth.

10. A gas stove, characterized in that: A burner with annular air inlet comprising any one of claims 1 to 9; Preferably, the valve body (4) and the ejector (1) are respectively connected to the outer shell of the gas stove by means of screws.

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