CN216953065U - Anti-backfire device and combustion equipment - Google Patents

Abstract

The utility model relates to an anti-backfire device and combustion equipment. Meanwhile, the flame on the burner is limited to be reversely transmitted to the first flow channel from the second flow channel by the through holes, so that the occurrence probability of a backfire phenomenon in the combustion process is reduced. Due to the length L of the through hole₁The ratio of the cross-sectional dimension A is greater than or equal to 5, so that the through-hole maintains a suitable length-to-diameter ratio in the anti-backfire device, thus avoiding the air involved in the combustion process from crossing the anti-backfireThe device is used for realizing effective and reliable anti-backfire control. In addition, through this through-hole, also can prevent to prevent in the manufacturing and the use tempering ware because of surface damage, lead to local macropore to appear and lead to preventing the tempering function to fail to ensure that the burning is stable goes on.

Description

Anti-backfire device and combustion equipment

Technical Field

The utility model relates to the technical field of combustion, in particular to an anti-backfire device and combustion equipment.

Background

In a combustion apparatus, such as a gas appliance, when an abnormal air supply pressure or other abnormal conditions occur during a combustion process, a backfire phenomenon may occur in a burner, a combustion position of a flame may change, the flame may be reversely transferred along an air supply pipe during combustion in the burner, thereby damaging the burner and even causing a safety accident. At present, technical measures such as flame detection and the like are adopted to solve part of problems, but under the condition that the fuel gas characteristic has higher flame combustion transfer rate, the existing measures are still difficult to effectively prevent damage caused by backfire.

SUMMERY OF THE UTILITY MODEL

The first technical problem to be solved by the present invention is to provide an anti-backfire device, which can effectively prevent the backfire phenomenon, has high reliability, and is beneficial to ensuring stable combustion.

The second technical problem to be solved by the present invention is to provide a combustion apparatus, which can effectively prevent the occurrence of the backfire phenomenon, has high reliability, and is advantageous to ensure stable combustion.

The first technical problem is solved by the following technical scheme:

an anti-backfire apparatus, said anti-backfire apparatus comprising: a gas supply pipe; the anti-backfire device is arranged in the gas supply pipe and divides the interior of the gas supply pipe into a first flow channel and a second flow channel, the second flow channel is communicated with the burner, a plurality of through holes are formed in the anti-backfire device, the through holes are used for conveying fuel gas from the first flow channel to the second flow channel and limiting the transmission of flame from the second flow channel to the first flow channel; cutting the through hole by a plane perpendicular to the axis of the through hole to obtain the cross section of the through hole, wherein the maximum inner circle can be formed in any cross section; of all the diameters of the largest inner circle, the largest diameter is defined as the cross-sectional dimension A, and the length L of the through-hole₁The ratio to the cross-sectional dimension A is greater than or equal to 5.

Compared with the background technology, the anti-backfire device of the utility model has the following beneficial effects: at the front end of the burner is provided withThe anti-backfire device is arranged, and the gas is supplied to the second flow passage from the first flow passage by utilizing the through holes so as to promote the stable combustion of the combustor. Meanwhile, the flame on the burner is limited to be reversely transmitted to the first flow channel from the second flow channel by the through holes, so that the occurrence probability of a backfire phenomenon in the combustion process is reduced. Due to the length L of the through hole₁The ratio to said cross-sectional dimension a is greater than or equal to 5, so that the through-hole maintains a suitable length-to-diameter ratio within the anti-backfire means, thus avoiding the entrapped air from crossing the anti-backfire means during combustion, to achieve an effective and reliable anti-backfire control. In addition, through this through-hole, also can prevent to prevent in the manufacturing and the use tempering ware because of surface damage, lead to local macropore to appear and lead to preventing the tempering function to fail to ensure that the burning is stable goes on.

In one embodiment, the length L of the through hole₁The ratio to the cross-sectional dimension A is greater than or equal to 5 and less than or equal to 15.

In one embodiment, the cross-sectional dimension A is 0.1mm to 0.8 mm.

In one embodiment, the first flow passage comprises a first section and a second section in communication, the first section being disposed closer to the second flow passage than the second section, the first section having an inner diameter D₁The first section is arranged to increase from one end of the first section towards the second section to one end of the first section towards the second flow passage.

In one embodiment, the included angle theta between the inner wall of the first section and the axis of the first section is 7-30 degrees.

In one embodiment, the length L of the second flow passage₂And the inner diameter D of the second section₂The ratio of (A) to (B) is less than or equal to 10.

In one embodiment, the backfire preventing device further comprises a sensor and a control valve, wherein the sensor is used for sensing the temperature on the backfire preventing device, and the control valve is used for controlling the on-off of gas in the gas supply pipe according to the temperature sensed by the sensor.

In one embodiment, the control valve is provided with an inlet end and an outlet end, the inlet end is used for communicating with an external air source, and the outlet end is communicated with the first flow passage.

In one embodiment, a side surface of the anti-backfire device facing the first flow passage is at least one of a plane, a wavy surface, a circular arc surface and a sawtooth surface.

In one embodiment, a side surface of the anti-backfire device facing the second flow passage is at least one of a plane, a wavy surface, a circular arc surface and a sawtooth surface.

The second technical problem is solved by the following technical solutions:

a combustion apparatus comprising a burner and the flashback arrestor of any one of the above, the burner being in communication with the second flow path.

Compared with the background art, the combustion equipment has the beneficial effects that: the anti-backfire device is adopted, the anti-backfire device is arranged at the front end of the combustor, and the gas is conveyed from the first flow passage to the second flow passage by utilizing the through holes so as to promote the combustor to stably combust. Meanwhile, the flame on the burner is limited to be reversely transmitted to the first flow channel from the second flow channel by the through holes, so that the occurrence probability of a backfire phenomenon in the combustion process is reduced. Due to the length L of the through hole₁The ratio to said cross-sectional dimension a is greater than or equal to 5, so that the through-hole maintains a suitable length-to-diameter ratio within the anti-backfire means, thus avoiding the entrapped air from crossing the anti-backfire means during combustion, to achieve an effective and reliable anti-backfire control. In addition, through this through-hole, also can prevent to prevent in the manufacturing and the use tempering ware because of surface damage, lead to local macropore to appear and lead to preventing the tempering function to fail to ensure that the burning is stable goes on.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic view of an embodiment of an anti-backfire apparatus;

FIG. 2 is a schematic structural view of an anti-backfire device according to another embodiment;

FIG. 3 is a cross-sectional view of an anti-backfire structure according to an embodiment;

fig. 4(a) to 4(d) are different shapes of the design diagrams of the side of the anti-backfire device.

Reference numerals:

100. an anti-backfire device; 110. a gas supply pipe; 111. a first flow passage; 1111. a first stage; 1112. a second stage; 112. a second flow passage; 120. a backfire preventer; 121. a through hole; 1211. a cross section; 130. an inductor; 140. a control valve; 141. an inlet end; 142. an outlet end; 200. a burner.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In one embodiment, referring to fig. 1 and fig. 3, a backfire preventing device 100 is disclosed, wherein the backfire preventing device 100 comprises: an air supply pipe 110 and an anti-backfire device 120. The anti-backfire device 120 is disposed in the air supply pipe 110 and divides the air supply pipe 110 into a first flow channel 111 and a second flow channel 112. The second flow passage 112 is for communication with the combustor 200. The tempering prevention device 120 is provided with a plurality of through holes 121. The through hole 121 is used for conveying the fuel gas from the first flow passage 111 to the second flow passage 112 and limits the transfer of flame from the second flow channel 112 into the first flow channel 111. The through-hole 121 is cut in a plane perpendicular to the axis of the through-hole 121 to obtain a cross section 1211 of the through-hole 121, and a maximum inner circle can be drawn in any of the cross sections 1211. Of all the diameters of the largest inner circle, the largest diameter is defined as the cross-sectional dimension A, and the length L of the through-hole 121₁The ratio to the cross-sectional dimension A is greater than or equal to 5.

In the anti-backfire device 100, the anti-backfire device 120 is disposed at the front end of the burner 200, and the gas is supplied from the first flow channel 111 to the second flow channel 112 through the plurality of through holes 121, so as to promote stable combustion of the burner 200. Meanwhile, the plurality of through holes 121 are used for limiting the flame on the burner 200 from reversely transmitting from the second flow channel 112 to the first flow channel 111, so as to reduce the occurrence probability of the backfire phenomenon in the combustion process. Due to the length L of the through hole 121₁The ratio to the cross-sectional dimension a is greater than or equal to 5, and therefore, the through-hole 121 maintains a suitable length-to-diameter ratio within the anti-backfire device 120, thus preventing entrapped air from passing over the anti-backfire device 120 during combustion to achieve effective and reliable anti-backfire control. In addition, through the through hole 121, the tempering prevention device 120 can also prevent the tempering prevention function from being invalid due to local large holes caused by surface damage in the manufacturing and using processes, thereby ensuring stable combustion.

It should be noted that the "largest inner circle" is understood to mean that the circle with the largest diameter may be formed within the cross-section 1211 and not exceed the contour boundary line of the cross-section 1211. The cross-section 1211 of the through-hole 121 may have various shapes, such as: the cross-section 1211 is shaped as a circle, triangle, square, rectangle, pentagon, hexagon, ellipse, etc.

If the shape of the cross-section 1211 obtained is a circle or a regular polygon, the maximum inner circle of the cross-section 1211 is the circle itself or the inscribed circle of the regular polygon; if the shape of the cross-section 1211 is non-circular or non-regular polygon, the maximum inner circle is the maximum circle allowed or allowed to pass through within the cross-section 1211, and the determination method can be performed by simulation calculation using programming software such as C + +, Python, Java, MATLAB, and the like.

It should be noted that the cross-sectional dimension a can be designed to be as small as possible when designing the through-hole 121. Such as: the section size A is controlled to be 0.1 mm-0.8 mm, so that the conditions of distribution, heat and the like of combustion products formed in the flame combustion process are not beneficial to the entering and mixing of combustion-supporting air; meanwhile, the conditions such as temperature required by combustion are not favorable for maintaining, so that the flame is difficult to continuously transmit. In addition, in the case of the tempering prevention control, the through-hole 121 may be designed as a variable cross-section hole, a curved hole, or the like.

Alternatively, the anti-backfire device 120 may be mounted in the air supply pipe 110 in a variety of ways, such as: the anti-backfire device 120 is clamped in the air supply pipe 110 in an interference fit manner; alternatively, the backfire arrester 120 may be fixed to the inner wall of the air supply pipe 110 by means of bonding, welding, bolting, pinning, or the like. Meanwhile, the backfire arrester 120 may be designed to have a grid structure, a porous medium structure, or the like.

Further, referring to fig. 3, the length L of the through hole 121₁The ratio to the cross-sectional dimension A is greater than or equal to 5 and less than or equal to 15. Thus, the aspect ratio of the through hole 121 is further controlled, so that the anti-tempering performance of the through hole 121 is better.

In one embodiment, referring to fig. 1, in order to prevent the flame from staying at the inlet end 141 of the burner 200 for a long time and damaging the combustion device, the distance between the anti-backfire device 120 and the burner 200 can be properly controlled, i.e. the length of the second flow passage 112 is properly designed. For example: length L of second flow passage 112₂The ratio of the inner diameter of at least one section of the first flow passage 111 to the inner diameter of the first flow passage is 10 or less, so that an excessive distance between the anti-backfire 120 and the burner 200 can be prevented, resulting in a flame staying at the inlet end 141 of the burner 200 for a long time.

In one embodiment, referring to fig. 1, the first channel 111 includes a first section 1111 and a second section 1112 connected in series. The first section 1111 is disposed closer to the second flow path 112 than the second section 1112, and the inner diameter D of the first section 1111₁The distance from the first section 1111 to the end of the second section 1112 to the end of the first section 1111 to the second flow channel 112 increases, wherein the increasing arrangement is understood to be gradually increasing and also to be changed such as increasing, then not changing, and then increasing. Since the anti-backfire device 120 can cause the new local resistance in the gas flowing process, the embodiment is that for this reasonThe first section 1111 with the increased inner diameter is arranged in front of the anti-backfire device 120, so that the flow speed of fuel gas passing through the anti-backfire device 120 is effectively reduced. Since the pressure loss through the flashback arrestor 120 is proportional to the square of the flow velocity, the pressure loss decreases as the gas flow velocity decreases.

In designing the length of the second flow channel 112, the length L of the second flow channel 112 may be set₂And the inner diameter D of the second segment 1112₂The ratio of (A) to (B) is less than or equal to 10.

Further, referring to fig. 1, an included angle θ between an inner wall of the first section 1111 and an axis of the first section 1111 is 7 ° to 30 °, that is, an expansion angle of the first section 1111 is 7 ° to 30 °, so that resistance loss during diameter change is correspondingly reduced when the gas is decelerated.

In one embodiment, referring to fig. 2, the anti-backfire apparatus 100 further comprises a sensor 130 and a control valve 140. The sensor 130 is used to sense the temperature on the anti-backfire apparatus 120. The control valve 140 is used for controlling the on-off of the gas in the gas supply pipe 110 according to the temperature sensed by the sensor 130. When the flame continues to approach the anti-backfire 120 causing an abnormal rise in the ambient temperature, the sensor 130 captures the abnormal temperature. At this time, the control valve 140 cuts off the flow of the gas in the gas supply pipe 110 according to the abnormal temperature signal, thereby realizing the function of actively extinguishing the flame and further improving the backfire prevention and control effect.

It should be noted that the signal control is performed between the sensor 130 and the control valve 140, that is, the control valve 140 can control the on/off of the gas in the gas supply pipe 110 according to the temperature signal of the sensor 130. The sensor 130 may be a temperature sensing electric element such as a thermocouple or a thermal resistor, the control valve 140 is an electric valve such as an electric valve or an electromagnetic valve, and the sensor 130 outputs an electric signal and the control valve 140 is controlled by the electric signal. Of course, the sensor 130 can also be a temperature and pressure sensing element, and the control valve 140 can be a pressure control valve 140 or the like directly controlled by the temperature and pressure sensing element.

In one embodiment, referring to fig. 2, the control valve 140 has an inlet port 141 and an outlet port 142. The inlet port 141 is adapted to communicate with an external gas source, and the outlet port 142 communicates with the first flow channel 111. At this time, when the control valve 140 is opened, the gas in the external gas source flows into the gas supply pipe 110 through the inlet port 141 and the outlet port 142; when the control valve 140 is closed, the inlet port 141 and the outlet port 142 are blocked, so that the gas from the external gas source cannot flow into the gas supply pipe 110.

In one embodiment, referring to fig. 4, a side surface of the anti-backfire device 120 facing the first flow channel 111 is at least one of a plane, a wavy surface, a circular arc surface and a sawtooth surface, which can be referred to fig. 4(a) to 4 (d). When one side surface of the tempering preventing device 120 is one of a wavy surface, a circular arc surface and a sawtooth surface, the contact area between the tempering preventing device 120 and the fuel gas can be increased, and the loss of contact resistance on the tempering preventing device 120 is reduced; and meanwhile, the gas distribution is more uniform, so that the resistance loss is less.

It should be noted that a side surface of the anti-backfire device 120 can be a plane, a wavy surface, a circular arc surface or a sawtooth surface. Of course, a side surface of the anti-backfire device 120 may be a combination of any two or three of a plane, a wavy surface, a circular arc surface and a sawtooth surface.

In addition, referring to fig. 4, a side surface of the anti-backfire device 120 facing the second flow channel 112 may also be at least one of a plane, a wavy surface, a circular arc surface and a sawtooth surface.

In one embodiment, referring to fig. 1, a combustion apparatus includes a burner 200 and the anti-backfire apparatus 100 of any of the above embodiments. The combustor 200 communicates with the second flow passage 112.

The above-mentioned combustion apparatus adopts the above anti-backfire device 100, and the anti-backfire device 120 is disposed at the front end of the burner 200, and the gas is supplied from the first flow channel 111 to the second flow channel 112 by the plurality of through holes 121, so as to promote the stable combustion of the burner 200. Meanwhile, the plurality of through holes 121 are used for limiting the flame on the burner 200 from reversely transmitting from the second flow channel 112 to the first flow channel 111, so as to reduce the occurrence probability of the backfire phenomenon in the combustion process. Due to the length L of the through hole 121₁The ratio of the diameter to the cross-sectional dimension A is 5 or more, so that the through-hole 121 maintains a suitable length-to-diameter ratio in the anti-backfire device 120, thus preventing air involved in the combustion process from passing over the anti-backfire device 120 to achieve an effective, efficient, and effective operationAnd the anti-backfire control is adopted. In addition, through the through hole 121, the tempering prevention device 120 can also prevent the tempering prevention function from being invalid due to local large holes caused by surface damage in the manufacturing and using processes, thereby ensuring stable combustion.

It should be noted that the combustion device can be any device using the above anti-backfire device 100, such as: gas cookers, gas water heaters, and the like.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims (10)

1. An anti-backfire device, characterized in that said anti-backfire device (100) comprises:

a gas supply pipe (110);

the gas burner comprises a backfire preventing device (120), wherein the backfire preventing device (120) is arranged in the gas supply pipe (110) and divides the interior of the gas supply pipe (110) into a first flow passage (111) and a second flow passage (112), the second flow passage (112) is used for being communicated with a burner (200), a plurality of through holes (121) are formed in the backfire preventing device (120), the through holes (121) are used for conveying gas from the first flow passage (111) to the second flow passage (112) and limiting flame from being transmitted from the second flow passage (112) to the first flow passage (111);

cutting the through hole (121) by a plane perpendicular to the axis of the through hole (121), and obtaining the cross section (1211) of the through hole (121), wherein the maximum inner circle can be made in any cross section (1211); the largest diameter among all the diameters of the largest inner circle is defined as a cross-sectional dimension A, and the length L of the through-hole (121)₁The ratio to the cross-sectional dimension A is greater than or equal to 5.

2. The flashback arrestor of claim 1, wherein the length L of the through-hole (121) is greater than the length L of the through-hole₁The ratio to the cross-sectional dimension A is greater than or equal to 5 and less than or equal to 15.

3. The flashback arrestor of claim 1, wherein the cross-sectional dimension A is from 0.1mm to 0.8 mm.

4. The flashback arrestor of claim 1, wherein the first flow channel (111) includes a first section (1111) and a second section (1112) in communication, the first section (1111) being distributed closer to the second flow channel (112) than the second section (1112), the first section (1111) having an inner diameter D₁Is arranged to increase from the first section (1111) towards one end of the second section (1112) to the first section (1111) towards one end of the second flow channel (112).

5. The device according to claim 4, characterized in that the angle θ between the inner wall of the first section (1111) and the axis of the first section (1111) is 7 ° to 30 °.

6. The flashback arrestor of claim 4, wherein the length L of the second flow passage (112)₂And the inner diameter D of the second segment (1112)₂The ratio of (A) to (B) is less than or equal to 10.

7. The backfire arrester as claimed in claim 1, wherein the backfire arrester (100) further comprises a sensor (130) and a control valve (140), the sensor (130) is used for sensing the temperature on the backfire arrester (120), and the control valve (140) is used for controlling the on-off of the gas in the gas supply pipe (110) according to the temperature sensed by the sensor (130).

8. The flashback arrestor of claim 7, wherein the control valve (140) has an inlet end (141) and an outlet end (142), the inlet end (141) being adapted to communicate with an external gas source, and the outlet end (142) being adapted to communicate with the first flow path (111).

9. The flashback preventing device according to any one of claims 1 to 8, wherein a side of the flashback preventer (120) facing the first flow path (111) is at least one of a plane, a wavy surface, a circular arc surface, and a serrated surface; and/or the presence of a gas in the gas,

one side surface of the anti-backfire device (120) facing the second flow channel (112) is at least one of a plane, a wavy surface, a circular arc surface and a sawtooth surface.

10. A combustion apparatus, characterized in that the combustion apparatus comprises a burner (200) and an anti-backfire apparatus (100) as claimed in any of claims 1 to 9, the burner (200) being in communication with the second flow channel (112).

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