Combustor and gas stove

Abstract

The invention discloses a combustor which comprises a shell, an outer fire cavity channel, an inner fire cavity channel and an inner fire cavity channel. The injection pipeline comprises an injection section and a turning section which are arranged in the gas path direction, and the injection section is used for injecting air from the gas inlet and mixing the air with the fuel gas; and the direction changing section is used for changing the direction of the gas path and enabling the spraying direction of the gas outlet to be tangent to the outer fire cavity channel. The invention further discloses a gas stove with the burner. The combustor has the beneficial effects that the flow path length of mixed gas is prolonged, and then the distribution uniformity can be improved, so that the combustion uniformity of the outer fire ring is improved.

Description

Technical Field

[0001] The invention relates to a burner and a gas stove, belonging to the technical field of kitchen appliances. Background Art

[0002] The burner and the ejector tube are important components of the gas stove. The burner is the part of the stove that directly generates flames, which determines the distribution of the flame and the combustion efficiency. The most common burner suitable for kitchens is the double-ring fire style. The interior of the burner has a ring-shaped outer fire cavity. The ejector tube is used to transport gas. The gas is sprayed into the ejector tube at a high speed, thereby injecting air into the ejector tube and mixing with the gas to form a mixed gas. After the mixed gas is sprayed into the outer fire cavity, it is ignited and burned at the fire hole of the outer fire cover of the burner.

[0003] In the current prior art, the ejector pipe is arranged as a linear structure, and the mixed gas ejected into the outer fire cavity has a slow flow velocity in the outer fire cavity and a large kinetic energy loss. In addition, the flow path of the mixed gas in the outer fire cavity is short, resulting in uneven distribution of the fuel gas in the outer fire cavity, which in turn leads to cross-combustion uniformity. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a burner and a gas stove, which extend the flow path length of the mixed gas, thereby improving the distribution uniformity and improving the combustion uniformity of the outer fire ring.

[0005] The present invention is achieved through the following technical solutions.

[0006] A burner, comprising:

[0007] A shell body having an annular outer fire cavity inside;

[0008] The ejection pipe comprises an ejection section and a redirection section arranged along the gas path. The ejection section is used to eject air from the air inlet and mix it with the fuel gas; the redirection section is used to change the direction of the gas path and make the ejection direction of the gas outlet tangent to the outer fire cavity.

[0009] As a further improvement of the present invention, the ejection pipe further includes an extension section, and the extension section is located downstream of the redirection section along the gas path direction.

[0010] As a further improvement of the present invention, the air path direction of the direction-changing section gradually changes along its extending direction.

[0011] As a further improvement of the present invention, the air path direction of the extension section is the same as the air path direction of the tail end of the redirecting section and the injection direction of the air outlet.

[0012] As a further improvement of the present invention, the gas path direction of the ejection section is the same as the gas path direction of the head end of the redirection section.

[0013] As a further improvement of the present invention, the ejection pipe has an expansion portion whose cross-sectional area gradually increases along the gas path direction, and the expansion portion is formed in the rear section of the ejection section, or in the front section of the turning section, or extends from the rear section of the ejection section to the front section of the turning section.

[0014] As a further improvement of the present invention, the ejection pipe has a contraction portion whose cross-sectional area gradually decreases along the gas path direction, and the contraction portion is formed at the rear section of the turning section, or at the front section of the extension section, or extends from the rear section of the turning section to the front section of the extension section.

[0015] As a further improvement of the present invention, the ejection pipe is connected to a shrinking structure at its air inlet, and the diameter of the shrinking structure gradually decreases along the air path direction of the ejection pipe.

[0016] As a further improvement of the present invention, at least two ejection pipes are provided and are centrally symmetrical with respect to the center of the shell.

[0017] A gas stove comprises the burner.

[0018] Beneficial effects of the present invention:

[0019] 1. The ejection section utilizes the negative pressure difference formed by the high-speed flow of the gas to draw the air outside the ejection pipe into the ejection section and mix it with the gas to form a mixed gas; the direction-changing section changes the direction of the gas path of the ejection pipe and is tangent to the outer fire cavity, so that the mixed gas ejected from the gas outlet can flow in a circular direction along the outer fire cavity, avoiding the kinetic energy loss caused by direct impact on the outer ring, extending the flow path length of the mixed gas, and then improving the distribution uniformity, thereby improving the combustion uniformity of the outer fire ring;

[0020] 2. The extension section can effectively extend the total length of the inlet and outlet pipes, so that the flow path of the mixed gas in the inlet and outlet pipes is extended, so that the gas and air are mixed more fully. Full mixing can ensure that each gas molecule has enough oxygen for complete combustion, thereby improving the combustion efficiency and significantly reducing the emission of incomplete combustion products such as carbon monoxide CO and unburned hydrocarbons HC;

[0021] 3. After the gas and air are mixed, they enter the expansion part. In the expansion part, as the cross-sectional area along the gas path gradually increases, the flow rate of the fluid formed by the gas and air will gradually decrease, and the static pressure of the fluid will gradually increase, which will extend the mixing time and facilitate the molecular diffusion and mixing between the gas and air, optimize the mixing process of the gas and air, and help to form a more uniform mixed gas, thereby enhancing the mixing efficiency of the mixed gas;

[0022] 4. The mixed gas passes through the expansion part and the contraction part in sequence. In the process of passing through the contraction part, the flow rate of the mixed gas gradually increases, and is ejected from the gas outlet in the direction tangent to the outer fire cavity at the highest flow rate, thereby further improving the combustion uniformity of the outer fire ring and avoiding the problem of excessive combustion intensity and weak combustion intensity in some parts of the outer fire cover;

[0023] 5. The setting of the contraction structure can facilitate the air to enter the injection pipe in a circular shape from the edge at the air inlet, which plays a role in converging the air and effectively increases the amount of air injected, so that the gas can be fully mixed with the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0025] Figure 1 is a schematic diagram of a burner from a top-down perspective;

[0026] Figure 2 It is a schematic diagram of the burner when viewed from an upward perspective;

[0027] Figure 3 is a schematic diagram of a burner in a three-dimensional perspective;

[0028] Figure 4 for Figure 2 Schematic diagram after cutting the outer structure along the dotted line Figure 1 ;

[0029] Figure 5 for Figure 2 Schematic diagram after cutting the outer structure along the dotted line Figure 2 ;

[0030] Figure 6 for Figure 2 Schematic diagram after cutting the outer structure along the dotted line Figure 3 ;

[0031] Figure 7 for Figure 2 Schematic diagram after cutting the outer structure along the dotted line Figure 4 ;

[0032] Figure 8is a cross-sectional schematic diagram of the burner at the air inlet;

[0033] Fig. 9 is a cross-sectional schematic diagram of the burner at the air outlet;

[0034] Fig.10 is a cross-sectional schematic diagram of a burner at a first position;

[0035] Fig.11 Schematic diagram of the burner after removing the outer fire cover;

[0036] Fig.12 It is a schematic diagram of the fire distributor;

[0037] Fig.13 A schematic diagram of the cover. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0039] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0040] Implementation Case 1:

[0041] Reference Figure 1-13 A burner comprises a shell 1 and an inlet and outlet pipe 2, wherein the shell 1 comprises an ignition divider 11, an outer fire cover 12 and an inner fire cover 13, wherein the ignition divider 11 comprises a bottom plate 1a and an inner surrounding ring, a middle surrounding ring 1b and an outer ring 1c connected to the bottom plate 1a, and the outer fire cover 12 is sealed on the middle surrounding ring 1b and the outer ring 1c, so that an annular space defined by the bottom plate 1a, the middle surrounding ring 1b, the outer ring 1c and the fire cover is formed inside the shell 1, and most of the space forms an outer fire cavity c, and the inlet and outlet pipe 2 injects a mixture of fuel gas and air into the outer fire cavity c, and an outer fire ring is formed on the fire hole 121 of the outer fire cover 12 through ignition by an igniter. In principle, an inner fire ring is formed on the fire hole 121 of the inner fire cover 13. Since the technical improvement of the present application does not involve this part, this part will not be described in detail in this implementation case.

[0042] In this embodiment, the head end and the tail end of the inlet and outlet pipe 2 are respectively formed with an air inlet a1 and an air outlet a2. As for the structural composition of the inlet and outlet pipe 2, the inlet and outlet pipe 2 includes an inlet section 21 and a redirecting section 22 arranged in sequence along the gas path direction, wherein the inlet section 21 is used to inject air from the air inlet a1 and mix it with the fuel gas, and the redirecting section 22 is used to change the gas path direction, that is, the gas path direction of the inlet and outlet pipe 2 changes when passing through the inlet section 21 and the redirecting section 22, and makes the injection direction of the outlet a2 tangent to the outer fire cavity c.

[0043] In this embodiment, an ejection section 21 and a redirection section 22 are provided on the ejection inlet pipe 2, wherein the ejection section 21 is equivalent to the ejection inlet pipe 2 in the prior art, and the gas nozzle on the nozzle seat injects the gas from the gas inlet a1 of the ejection inlet pipe 2, and the ejection section 21 utilizes the negative pressure difference formed by the high-speed flow of the gas to inject the air outside the ejection inlet pipe 2 into the ejection section 21, and mixes with the gas to form a mixed gas, which can ensure that the gas can be fully burned during combustion. The redirection section 22 can change the gas path direction of the ejection inlet pipe 2 after passing through the ejection section 21 along the gas path direction, so that the mixed gas is finally injected into the outer fire cavity c from the gas outlet a2 along the direction tangent to the outer fire cavity c. By changing the direction of the gas path of the inlet and outlet pipe 2 through the redirecting section 22 and making it tangential to the outer fire cavity c, the mixed gas ejected from the gas outlet a2 can flow in an annular direction along the outer fire cavity c, and the kinetic energy loss caused by the mixed gas directly impacting the outer ring 1c can be avoided, thereby increasing the annular flow speed of the mixed gas in the outer fire cavity c and forming a circular flow, extending the flow path length of the mixed gas in the outer fire cavity c, and then being able to improve the uniformity of the distribution of the mixed gas in the outer fire cavity c, thereby improving the combustion uniformity of the outer fire ring.

[0044] In this embodiment, the structure of the inlet and ejection pipe 2 includes an extension section 23, which is located downstream of the redirection section 22 along the gas path, so that the inlet and ejection pipe 2 is arranged in sequence as the ejection section 21, the redirection section 22 and the extension section 23 along the gas path. The extension section 23 can effectively extend the total length of the inlet and ejection pipe 2, so that the flow path of the mixed gas in the inlet and ejection pipe 2 is extended, so that the mixing of the gas and the air is more complete. The complete mixing can ensure that each gas molecule has enough oxygen for complete combustion, thereby improving the combustion efficiency and significantly reducing the emission of incomplete combustion products such as carbon monoxide CO and unburned hydrocarbons HC. In addition, the mixed gas obtained by fully mixing the gas and air maintains a stable combustion flame during combustion to avoid flameout or deflagration.

[0045] In this embodiment, the gas path direction of the turning section 22 gradually changes along its extension direction, so that the turning section 22 presents an arc-shaped or curved linear structure. The gradual change of the gas path of the turning section 22 provides a smoother transition, reduces the sudden turning of the mixed gas fluid during the flow process, and can reduce the friction resistance between the fluid and the pipe wall, thereby reducing the pressure loss and reducing the energy loss caused by turbulence.

[0046] In the present embodiment, the gas path direction of the extension section 23 is the same as the gas path direction of the tail end of the turning section 22 and the injection direction of the gas outlet a2. The mixed gas completes the adjustment process of the airflow direction in the inlet and outlet pipe 2 through the turning section 22, and the flow direction in the extension section 23 remains unchanged, so that when the gas and air are fully mixed, the friction resistance is low to reduce energy loss, and the turbulence degree can be reduced, so that the mixed gas ejected in the direction tangent to the external fire cavity c has high stability and high flow rate.

[0047] In this embodiment, the gas path direction of the ejection section 21 is the same as the gas path direction of the head end of the turning section 22, that is, the gas path direction of the turning section 22 is gradually adjusted and changed by the gas path direction of the ejection section 21, so that the adjustment change of the gas path direction is relatively smooth, further reducing the energy loss caused by friction resistance.

[0048] In this embodiment, the structure of the inlet and ejection pipe 2 is provided with an expansion part m1, and the cross-sectional area of ​​the expansion part m1 gradually increases along the gas path direction of the inlet and ejection pipe 2. As for the position of the expansion part m1 on the inlet and ejection pipe 2, in the first embodiment, the expansion part m1 is formed at the rear section of the ejection section 21; in the second embodiment, the expansion part m1 is formed at the front section of the redirection section 22; in the third embodiment, the expansion part m1 extends from the rear section of the ejection section 21 to the front section of the redirection section 22. All three embodiments are possible, and in all three embodiments, after the ejection section 21 completes its ejection function, the gas and air are mixed and enter the expansion part m1. In the expansion part m1, as the cross-sectional area gradually increases along the gas path direction, the flow rate of the fluid formed by the gas and air will gradually decrease, and at the same time, the static pressure of the fluid will gradually increase, prolonging the mixing time, thereby facilitating the molecular diffusion and mixing between the gas and the air, optimizing the mixing process of the gas and the air, and helping to form a more uniform mixed gas, thereby enhancing the mixing efficiency of the mixed gas.

[0049] In this embodiment, with regard to the structure of the inlet and outlet pipe 2, the inlet and outlet pipe 2 has a contraction portion m2, and the cross-sectional area of ​​the contraction portion m2 gradually decreases along the gas path direction of the inlet and outlet pipe 2. With regard to the position of the contraction portion m2 on the inlet and outlet pipe 2, in the first embodiment, the contraction portion m2 is formed at the rear section of the turning section 22; in the second embodiment, the contraction portion m2 is formed at the front section of the extension section 23; in the third embodiment, the contraction portion m2 extends from the rear section of the turning section 22 to the front section of the extension section 23. All three of the above embodiments are applicable, and in the above three embodiments, the mixed gas formed by the mixture of fuel gas and air passes through the expansion portion m1 and the contraction portion m2 in sequence. In the process of passing through the contraction portion m2, since its cross-sectional area is continuously reduced along the gas path direction of the inlet injection pipe 2, the flow velocity of the mixed gas gradually increases, and is ejected from the gas outlet a2 in the direction tangent to the outer fire cavity c at the highest flow velocity, thereby further improving the combustion uniformity of the outer fire ring and avoiding the problems of excessive local combustion intensity and weak local combustion intensity on the outer fire cover 12.

[0050] In addition, the mixed gas maintains its maximum flow rate when it is ejected from the gas outlet a2, so that the mixed gas can form a certain negative pressure intensity, which can "suck" the unburned gas in the outer fire cavity c to enhance and increase the total amount of the mixed gas and achieve a better combustion effect.

[0051] It should be noted that the mixed gas maintains its maximum flow rate when it is ejected from the air outlet a2. Since the injection speed of the mixed gas is fast enough, the flame can be prevented from flowing back into the inlet and outlet pipe 2 and making noise when the burner is turned off, that is, backfire noise can be avoided, and damage to the structure of the inlet and outlet pipe 2 at the air inlet a1 due to backfire can also be avoided.

[0052] In this embodiment, the inlet and ejection pipe 2 is connected to a constriction structure 24 at its air inlet a1, and the diameter of the constriction structure 24 gradually decreases along the air path direction of the inlet and ejection pipe 2, thereby forming a trumpet-shaped structure. The setting of the constriction structure 24 can facilitate the air to enter the ejection pipe 2 from the edge in an annular manner at the air inlet a1, play a role in converging the air and effectively increase the amount of air injected, so that the gas can be fully mixed with the air; in addition, the constriction structure 24 with a gradually decreasing diameter can make the air have a smooth transition area before entering the ejection pipe 2, thereby reducing turbulence and vortex, and improving the flow stability when the air and gas are mixed.

[0053] In the present embodiment, with respect to the shape setting and variation of the inlet and outlet pipe 2, the shape setting of the air outlet a2 of the inlet and outlet pipe 2 is suitable for the mixed gas ejected from the air outlet a2 to instantly occupy the lower space of the outer fire cavity c, so that the mixed gas ejected from the air outlet a2 can instantly occupy the lower space of the outer fire cavity c without diffusion, which can effectively reduce the flow velocity loss of the mixed gas as a fluid during its flow in the outer fire cavity c, and is beneficial to extend the flow path length of the mixed gas in the outer fire cavity c, thereby improving the uniformity of combustion; in addition, it can also reduce the turbulence and disturbance caused by the need for diffusion of the ejected mixed gas, thereby improving the smoothness of the gas flow.

[0054] Regarding the shape setting of the cross section of the inlet and outlet pipe 2, in the present embodiment, the cross section shape of the inlet and outlet pipe 2 gradually changes from the shape of the air inlet a1 to the shape of the air outlet a2 along the gas path direction. By gradually setting the cross section shape of the inlet and outlet pipe 2, not only can the cross section shape of the inlet and outlet pipe 2 be gradually adjusted to the shape of the air outlet a2, so that the mixed gas can occupy the lower space of the outer fire cavity c at the moment of injection; but also, the turbulence generated when the mixed gas flows in the inlet and outlet pipe 2 can be reduced, which is beneficial to the smooth flow and transportation in the inlet and outlet pipe 2.

[0055] As for the shape setting of the air outlet a2, in this embodiment, the shape of the air outlet a2 is consistent with the lower part of the cross-sectional shape of the outer fire cavity c, so that the mixed gas ejected from the air outlet a2 can instantly occupy the lower space of the outer fire cavity c.

[0056] More specifically, in this embodiment, the air outlet a2 includes a top edge, a bottom edge and two side edges. The bottom edge of the air outlet a2 is defined by the bottom plate 1a of the shell 1, and the two side edges of the air outlet a2 are respectively defined by the outer ring 1c and the middle ring 1b of the shell 1, so that the specific shape of the air outlet a2 is a quadrilateral, and the mixed gas is ejected from the air outlet a2 close to the outer ring 1c, the middle ring 1b and the bottom plate 1a.

[0057] As for the shape setting of the air inlet a1, in the present embodiment, the shape of the air inlet a1 is set to be circular, and the gas is injected into the center of the air inlet a1 at a high speed, so that the air can be introduced into the introduction pipe 2 in a state of surrounding the gas and mixed with the gas, thereby increasing the contact area between the air and the gas and thus enhancing the mixing effect. In addition, the circular air inlet a1 can reduce the possibility of turbulence and local vortex when the air enters, thereby making the air flow smoother and reducing noise.

[0058] In this embodiment, under the action of high-speed gas injection, air is introduced into the introduction section 21 of the introduction pipe 2, and the gas and air are gradually mixed into a mixed gas in the introduction section 21 along the gas path direction, and then the gas path direction of the mixed gas is gradually changed by the redirection section 22 until it is adjusted to be inclined to the direction of the outer fire cavity c, and then flows in the extension section 23 and extends the flow path length, and finally ejected from the gas outlet a2. During the flow process in the introduction pipe 2, it also undergoes the full mixing of the expansion section m1 and the acceleration effect of the contraction section m2 in sequence, thereby the cross-sectional area of ​​the introduction pipe 2 is also changed along the gas path direction, and the cross-sectional area of ​​the introduction pipe 2 gradually increases, gradually decreases, and remains unchanged along the gas path direction. In addition, the horizontal height of the gas outlet a2 of the introduction pipe 2 is higher than the horizontal height of the gas inlet a1. More specifically, the gas inlet a1 of the introduction pipe 2 is located below the bottom plate 1a of the ignition distributor 11, and the gas outlet a2 is located above the bottom plate 1a of the ignition distributor 11.

[0059] Regarding the change in height of the inlet and ejection pipe 2 along the gas path, in this embodiment, the upper half pipe 2a of the inlet and ejection pipe 2 is gradually raised from the head end to the first point p1 along the gas path, and then the horizontal height is maintained from the first point p1 to the tail end, while the lower half pipe 2b of the inlet and ejection pipe 2 is gradually lowered from the head end to the second point p2 along the gas path, and gradually raised from the second point p2 to the third point p3, and the horizontal height is maintained from the third point p3 to the tail end. It should be noted that for the upper half pipe 2a and the lower half pipe 2b, the head ends of both correspond to the position of the air inlet a1, and the tail ends correspond to the position of the air outlet a2.

[0060] In the present embodiment, the change in horizontal height of the upper half pipe 2a along the gas path direction is slower than that of the lower half pipe 2b, and the upper half pipe 2a of the inlet and outlet pipe 2 is located in the internal space of the shell 1, which is beneficial to the smooth flow of the mixed gas in the outer fire cavity c. The lower half pipe 2b of the inlet and outlet pipe 2 will not affect the smooth flow of the mixed gas in the outer fire cavity c. Therefore, the change in horizontal height of the lower half pipe 2b of the inlet and outlet pipe 2 cooperates with the upper half pipe 2a to adapt to the change in the cross-sectional area of ​​the inlet and outlet pipe 2.

[0061] In this embodiment, along the gas path direction of the inlet and outlet pipe 2, the first point p1 is located between the second point p2 and the third point p3. The section of the inlet and outlet pipe 2 extending forward from the second point p2 along the gas path direction is the expansion part m1, and the section of the inlet and outlet pipe 2 from the second point p2 to the third point p3 is the contraction part m2. The first point p1 is set between the second point p2 and the third point p3, so that the cross-sectional area of ​​the contraction part m2 gradually decreases to a smaller extent from the second point p2 to the first point p1 in the first half than from the first point p1 to the third point p3 in the second half, so as to achieve the effect of buffering fluid changes.

[0062] In the present embodiment, the cross-sectional shape of the upper pipe 2a gradually changes from the air inlet a1 along the air path direction and suddenly changes to the shape of the air outlet a2 at the first point p1. The change in horizontal height of the upper pipe 2a is gentler than that of the lower pipe 2b. Therefore, the cross-sectional shape of the upper pipe 2a is suddenly changed to the shape of the air outlet a2 at the first point p1, so that the shape of the upper half of the inlet and outlet pipe 2 is adjusted in advance to match the shape of the air outlet a2 and will not cause too much influence on the flow state of the mixed gas; the cross-sectional shape of the lower pipe 2b gradually changes from the air inlet a1 along the air path direction and gradually changes to the shape of the air outlet a2 at the third point p3. The change in horizontal height of the lower pipe 2b is steeper than that of the upper pipe 2a. Therefore, the cross-sectional shape of the upper pipe 2a is gradually changed to the shape of the air outlet a2 at the third point p3, so that the cross-sectional shape of the upper pipe 2a changes more gently, which is conducive to stabilizing the flow state of the mixed gas.

[0063] As for the specific structural setting of the inlet and outlet pipe 2, in the present embodiment, the bottom plate 1a of the ignition device 11, i.e., the bottom plate 1a of the shell body 1, has a sinking section 1s extending circumferentially and recessed downward, the head of the sinking section 1s is provided with an opening and forms an air inlet a1 of the inlet and outlet pipe 2, i.e., the sinking area of ​​the bottom plate 1a and a section of the bottom plate 1a extending from the tail of the sinking area constitute the lower half pipe 2b of the inlet and outlet pipe 2, a cover plate 3 is circumferentially arranged in the shell body 1, the cover plate 3 is connected to the bottom plate 1a of the shell body 1 by a section extending from the head end along the gas path direction, the cover plate 3 constitutes the upper half pipe 2a of the inlet and outlet pipe 2, the tail end of the cover plate 3 and the bottom plate 1a, the outer ring 1c and the middle ring 1b of the shell body 1 define an air outlet a2 of the inlet and outlet pipe 2. Based on the above structural arrangement, the air inlet a1 and the front half of the inlet and outlet pipe 2 are located below the bottom plate 1a, and the air outlet a2 and the rear half of the inlet and outlet pipe 2 are located above the bottom plate 1a.

[0064] In the present embodiment, the cover plate 3 extends circumferentially in the shell 1. Due to the arrangement of the cover plate 3, the space in the shell 1 is circumferentially divided into a double-layer space r1 corresponding to the cover plate 3, and a single-layer space r2 not layered by the cover plate 3, wherein the lower space r12 in the double-layer space r1 forms the inlet and outlet pipe 2, and the upper space r11 of the double-layer space r1 and the single-layer space r2 form an annular outer fire cavity c.

[0065] In this embodiment, the space inside the shell 1 is layered by the cover plate 3, i.e., the upper half of the pipe 2a. The mixed gas is ejected from the lower space r12 in a direction inclined to the outer fire cavity c and enters the single-layer space r2. It flows along the annular direction of the outer fire cavity c at a high speed through the single-layer space r2 and then enters the upper space r11. This can greatly extend the flow path length of the mixed gas in the shell 1, thereby improving the uniformity of combustion. In addition, it should be noted that the mixed gas gradually burns after being ejected from the gas outlet a2, and the flow rate gradually decreases. When the mixed gas is ejected into the outer fire cavity c, the flow rate is the highest, thereby forming a negative pressure environment in the single-layer space r2, and the residual mixed gas that flows from the upper space r11 into the single-layer space r2, which is not burned and has a large flow rate loss, can be sucked in, thereby improving the flow rate of the mixed gas along the annular direction in the outer fire cavity c as a whole.

[0066] In this embodiment, the cross-sectional area of ​​the upper space r11 of the double-layer space r1 gradually decreases along the gas path direction. The mixed gas is continuously burned as it flows in the outer fire cavity c. The gradual reduction in the cross-sectional area of ​​the upper space r11 can reduce the pressure difference, which is beneficial to maintaining the flow rate of the mixed gas and the uniformity of combustion.

[0067] In this embodiment, more specifically, the cover plate 3, i.e., the upper half of the pipe 2a, is formed with a climbing section 31 along its extension direction, and the climbing section 31 is gradually raised along the gas path direction of the outer fire cavity c, so that the horizontal height of the tail end of the cover plate 3 is higher than the horizontal height of the head end. On the one hand, the gradually raised horizontal height of the climbing section 31 matches the continuously shrinking cross-sectional area of ​​the upper space r11, and on the other hand, when the mixed gas flows in the upper space r11, it gradually rises along the climbing section 31, so that the flow path of the mixed gas in the shell 1 is in a spiral upward trend as a whole, which is conducive to its continuous combustion and maintaining the uniformity of combustion.

[0068] In this embodiment, the cover plate 3, i.e., the upper half of the pipe 2a, is formed with a horizontal section 32 along its extension direction. The horizontal section 32 maintains a constant horizontal height along the gas path direction of the outer fire chamber c, and the horizontal section 32 is connected to the climbing section 31 and extends to the tail end of the cover plate 3. The connection point between the climbing section 31 and the horizontal section 32 is the first point p1.

[0069] In this embodiment, the cover plate 3 has an inclined portion 33, which is gradually raised from the inner side plate of the cover plate 3 to the outer side, and the cover plate 3 is formed with an inclined portion 33 near its rear end. The setting of the inclined section can make the mixed gas flowing into the upper space r11 closer to the fire hole 121 of the fire cover, which is conducive to combustion. It should be noted that the inclined portion 33 can cover the horizontal section 32, and can also continue to cover part of the climbing section 31 forward.

[0070] In this embodiment, two inlet and outlet pipes 2 are provided, and they are centrally symmetrical about the center of the housing 1. The number of inlet and outlet pipes 2 is set according to actual needs, and more than two can be provided.

[0071] Implementation Case 2:

[0072] A gas stove includes a burner, and the burner is as shown in implementation example 1.

[0073] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A burner, characterized in that: include: A shell (1) having an annular outer fire cavity (c) inside; The inlet and outlet pipe (2) comprises an inlet section (21) and a redirecting section (22) arranged along the direction of the gas path, wherein the inlet section (21) is used to inject air from the gas inlet (a1) and mix it with the fuel gas; and the redirecting section (22) is used to change the direction of the gas path and make the injection direction of the gas outlet (a2) tangent to the outer fire cavity (c).

2. The burner according to claim 1, characterized in that The inlet and outlet pipe (2) further comprises an extension section (23), wherein the extension section (23) is located downstream of the redirecting section (22) along the gas path direction.

3. The burner according to claim 2, characterized in that: The air path direction of the direction-changing section (22) gradually changes along its extending direction.

4. The burner according to claim 2, characterized in that: The air path direction of the extension section (23) is the same as the air path direction of the tail end of the redirection section (22) and the injection direction of the air outlet (a2).

5. The burner according to claim 2, characterized in that: The gas path direction of the ejection section (21) is the same as the gas path direction of the head end of the redirection section (22).

6. The burner according to any one of claims 2 to 5, characterized in that: The inlet and outlet pipe (2) has an expansion portion (m1) whose cross-sectional area gradually increases along the gas path direction; the expansion portion (m1) is formed at the rear section of the outlet section (21), or at the front section of the redirecting section (22), or extends from the rear section of the outlet section (21) to the front section of the redirecting section (22).

7. The burner according to claim 6, characterized in that The inlet and outlet pipe (2) has a contraction portion (m2) whose cross-sectional area gradually decreases along the gas path direction; the contraction portion (m2) is formed at the rear section of the redirecting section (22), or at the front section of the extension section (23), or extends from the rear section of the redirecting section (22) to the front section of the extension section (23).

8. The burner according to any one of claims 1 to 5, characterized in that: The inlet and outlet pipe (2) is connected to a constriction structure (24) at its air inlet (a1), and the diameter of the constriction structure (24) gradually decreases along the air path direction of the inlet and outlet pipe (2).

9. The burner according to any one of claims 1 to 5, characterized in that: At least two of the inlet and outlet pipes (2) are provided and are centrally symmetrical with respect to the center of the shell (1).

10. A gas stove, characterized in that: Comprising the burner according to any one of claims 1 to 9.

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