Anti-backfire injection pipe and gas stove

Abstract

The utility model belongs to the technical field of gas stoves, and discloses an anti-backfire injection pipe and a gas stove. A contraction section, a one-way valve section and a diffusion section which communicate with one another are sequentially arranged in the anti-backfire injection pipe in the gas inlet direction, and the one-way valve section is configured to conduct mixed gas from the contraction section to the diffusion section in a one-way mode. According to the utility model, by utilizing the one-way conduction function of the one-way valve section, flame or gas in the furnace chamber can be reversely cut off, so that backfire prevention is realized; the one-way valve section is arranged in the anti-backfire injection pipe, the structural characteristics of the injection pipe are fully utilized, backfire prevention is achieved under the condition that no extra parts are added, and the use cost of anti-backfire materials is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas stoves, in particular to an anti-backfire ejection pipe and a gas stove. Background Art

[0002] The function of the ejector tube of a gas stove is to inhale primary air through the ejection effect, and the primary air is fully mixed with the gas inside the ejector tube to form a mixed gas that can be safely burned, and then sent to the gas hole for combustion. The inappropriate ratio of gas and air in the mixed gas is one of the problems of flashback. When a gas stove flashes back, the flame will retract into the inner cavity of the stove, and the flame will spray out from the primary air inlet of the ejector tube. If there is no shielding, the flame will rush upward to the panel. If the panel is made of glass, it is easy to explode, causing the risk of burning parts such as the stove head and the panel. Therefore, it is necessary to set a structure on the air adjustment structure to prevent the flashback flame from rushing upward.

[0003] In the prior art, the flashback prevention is realized by installing a flashback prevention valve on the burner head. Since the flashback prevention valve is automatically cut off according to the pressure change, there is a possibility of misjudgment of pressure, which affects normal use; and the flashback prevention valve will take up extra installation space in the burner head, resulting in an increase in the volume and weight of the burner head, more parts to be installed, and an increase in material use costs. Utility Model Content

[0004] One of the technical problems solved by the utility model is to provide an anti-flashback ejector tube, which can avoid the occurrence of flashback phenomenon and reduce the use cost of anti-flashback materials.

[0005] The second technical problem solved by the utility model is to provide a gas stove, which can avoid the occurrence of flashback phenomenon in the gas stove and reduce the cost of using anti-flashback materials.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] A flashback ejector tube is disclosed, wherein a contraction section, a one-way valve section and a pressure diffuser section are connected to each other in sequence along the air intake direction, and the one-way valve section is configured to conduct mixed gas from the contraction section to the pressure diffuser section in a one-way manner.

[0008] Compared with the background technology, the anti-flashback ejector tube of the utility model has the following beneficial effects:

[0009] After the fuel gas and primary air are mixed in the contraction section of the anti-flashback ejector tube, they are unidirectionally conducted to the expansion section and the furnace chamber through the one-way valve section to participate in the combustion. Due to the one-way conduction function of the one-way valve section, the flame or gas in the furnace chamber can be reversely cut off, thereby realizing anti-flashback. The one-way valve section is arranged inside the anti-flashback ejector tube, which makes full use of the structural characteristics of the ejector tube, realizes anti-flashback without adding additional parts, and reduces the cost of using anti-flashback materials.

[0010] In one of the embodiments, the one-way valve section is provided with a Tesla valve channel, and the Tesla valve channel is coaxially arranged with the central axis of the anti-flashback ejector tube.

[0011] In one embodiment, the Tesla valve channel includes a forward flow channel, a plurality of resistance flow channels and a plurality of diverter blocks, one end of the forward flow channel is connected to the contraction section, the other end of the forward flow channel is connected to the expansion section, a plurality of diverter blocks are arranged on both sides of the forward flow channel, the resistance flow channel is arranged around the diverter blocks, and both ends of the resistance flow channel are connected to the forward flow channel.

[0012] In one embodiment, the number of the diverter blocks on each side of the forward flow channel is 3-4.

[0013] In one of the embodiments, a straight section is further provided in the anti-flashback ejector pipe, wherein the straight section is arranged at the air inlet of the anti-flashback ejector pipe and connected to the air inlet side of the contraction section; a gas nozzle is provided on the anti-flashback ejector pipe, wherein the gas nozzle is arranged in the straight section and directly opposite to the forward flow channel.

[0014] In one of the embodiments, along the air intake direction, the ratio of the length of the diffuser section to the length of the contraction section is 1:2.5-1:2.

[0015] In one embodiment, the anti-flashback ejector tube includes a first split body and a second split body arranged on both sides of its axis, the first split body and the second split body are sealed and connected, the first split body is provided with a first one-way valve segment, the second split body is provided with a second one-way valve segment, and after the first split body and the second split body are connected, the first one-way valve segment and the second one-way valve segment are combined to form the one-way valve segment.

[0016] In one embodiment, a sealing structure is provided between the first sub-body and the second sub-body, and the sealing structure is a rubber pad or a sealant provided on the first sub-body and / or the second sub-body.

[0017] In one embodiment, the first split body is provided with first connecting ears on both sides of its mating surface, and the second split body is provided with second connecting ears on both sides of its mating surface. The first connecting ears and the second connecting ears at corresponding positions on the first split body and the second split body are fastened together by a connecting piece.

[0018] The above second technical problem is solved by the following technical solution:

[0019] A gas stove comprises a burner head and the anti-flashback ejector pipe described in any one of the above embodiments, wherein the burner head has a furnace cavity, the anti-flashback ejector pipe is connected to the burner head, and the expansion section of the anti-flashback ejector pipe is connected to the furnace cavity.

[0020] The gas stove described in the utility model includes the anti-flashback ejector pipe provided by the utility model. By arranging a contraction section, a one-way valve section and a pressure expansion section inside the ejector pipe, the mixed gas enters the pressure expansion section and the furnace chamber in a one-way manner through the one-way valve section to participate in combustion. Due to the one-way conduction function of the one-way valve section, the flame or gas in the furnace chamber can be reversely cut off, thereby realizing anti-flashback. The one-way valve section is arranged inside the anti-flashback ejector pipe, which makes full use of the structural characteristics of the ejector pipe, realizes anti-flashback without adding additional parts, and reduces the cost of using anti-flashback materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the anti-flashback ejector tube provided in an embodiment of the utility model;

[0022] Figure 2 A cross-sectional view of the anti-flashback ejector tube provided in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the exploded structure of the anti-flashback ejector tube provided in an embodiment of the utility model.

[0024] In the figure:

[0025] 1. Anti-flashback ejector tube; 11. Contraction section; 12. One-way valve section; 121. Forward flow channel; 122. Resistance flow channel; 123. Diverter block; 13. Gas nozzle; 14. Primary air inlet; 15. First split body; 151. First connecting ear; 16. Second split body; 161. Second connecting ear; 162. Second connecting hole; 17. Connector; 18. Diffuser section; 19. Straight section;

[0026] 2. Furnace head; 21. Furnace cavity. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0028] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, 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 of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0031] The utility model embodiment first provides an anti-flashback ejector tube 1, such as Figure 1-Figure 3 The anti-flashback ejector tube 1 is connected to the furnace head 2, and the furnace head 2 is provided with a furnace chamber 21; the interior of the anti-flashback ejector tube 1 is provided with a contraction section 11, a one-way valve section 12 and a diffuser section 18 which are interconnected in sequence along the air intake direction, and the one-way valve section 12 is configured to unidirectionally conduct the mixed gas from the contraction section 11 to the diffuser section 18.

[0032] In the utility model, after the fuel gas and the primary air are mixed in the contraction section 11 of the anti-flashback ejector 1, they are unidirectionally conducted to the expansion section 18 and the furnace chamber 21 through the one-way valve section 12 to participate in the combustion. Due to the one-way conducting function of the one-way valve section 12, the flame or gas in the furnace chamber 21 can be reversely cut off, thereby realizing the anti-flashback. The one-way valve section 12 is arranged inside the anti-flashback ejector 1, making full use of the structural characteristics of the ejector, realizing the anti-flashback without adding additional parts, and reducing the cost of using the anti-flashback material.

[0033] In one embodiment, the one-way valve section 12 is provided with a Tesla valve channel, and the Tesla valve channel is coaxially arranged with the central axis of the anti-flashback ejector tube 1 .

[0034] like Figure 2 As shown, the Tesla valve channel has the principle of forward acceleration and reverse cutoff. The Tesla valve channel is processed inside the anti-flashback ejector tube 1, which has the advantages of simple structure and is easy to process and form. The Tesla valve channel is arranged along the central axis of the anti-flashback ejector tube 1 and is coaxial with the central axis, which facilitates the mixed gas to quickly pass through the Tesla valve channel, improves the flow speed of the mixed gas, reduces the stroke of the mixed gas in the anti-flashback ejector tube 1, and can effectively cut off the flame or gas backflow in the furnace chamber 21.

[0035] In one embodiment, the Tesla valve channel includes a forward flow channel 121, a plurality of resistance flow channels 122 and a plurality of diverter blocks 123, the first end of the forward flow channel 121 is connected to the contraction section 11, the second end of the forward flow channel 121 is connected to the diffusion section 19, the plurality of diverter blocks 123 are disposed on both sides of the forward flow channel 121, the resistance flow channel 122 is disposed around the diverter blocks 123, and both ends of the resistance flow channel 122 are connected to the forward flow channel 121.

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, the inlet of the forward flow channel 121 is connected to the contraction section 11, the outlet of the forward flow channel 121 is connected to the expansion section 18, the resistance flow channel 122 is a curved stroke, and the two ends of the resistance flow channel 122 are connected to the forward flow channel 121 after bypassing the diverter block 123. A plurality of resistance flow channels 122 are arranged on both sides of the forward flow channel 121. The number of resistance flow channels 122 and the number of diverter blocks 123 are the same and the two are arranged one by one. After the mixed gas in the contraction section 11 enters the Tesla valve channel, the mixed gas enters from the first end of the forward flow channel 121 and flows along the forward flow channel 121 (such as Figure 2The flame or gas flows through the forward flow channel 121 and the resistance flow channel 122 from the second end of the forward flow channel 121 to provide combustion gas. When flashback occurs at the burner head 2, the flame or gas will enter the forward flow channel 121 and the resistance flow channel 122 from the second end of the forward flow channel 121. Under the action of the resistance flow channel 122, the flame will be diverted each time it passes through the resistance flow channel 122. The diverted part will converge with the flame in the forward flow channel 121 again at the other end of the resistance flow channel 122. The flow rates offset each other, thereby reducing the flow rate. After multiple diversions and convergences, the flame flow rate is completely offset, thereby eliminating flashback. The flame is cut off inside the Tesla valve channel to achieve anti-flashback.

[0037] Preferably, the total number of the diverter blocks 123 in the anti-flashback ejector tube 1 is 6-8, which are arranged on both sides of the forward flow channel 121. Accordingly, 3-4 resistance flow channels 122 are arranged on each side of the forward flow channel 121. Figure 2 As shown, four diverter blocks 123 and four resistance flow channels 122 are provided on both sides of the forward flow channel 121, so that the anti-flashback effect can be achieved. If too many diverter blocks 123 are provided, the length of the main body of the anti-flashback ejector tube 1 will be too large, increasing the material cost, and too few will affect the anti-flashback effect. Therefore, the number of diverter blocks on each side of the forward flow channel 121 is 3-4.

[0038] In one embodiment, a straight section 19 is further provided in the anti-flashback ejector tube 1. The straight section 19 is provided at the air inlet of the anti-flashback ejector tube 1 and connected to the air inlet side of the contraction section 11 for preliminary mixing of air and gas. The inner diameter of the straight section 19 is the same as the inner diameter of the large-diameter end of the contraction section 11. The gas preliminarily mixed in the straight section 19 sequentially enters the contraction section 11 for further mixing.

[0039] See also Figure 2 A gas nozzle 13 is provided on the anti-backfire ejector pipe 1 , and the gas nozzle 13 is arranged in the straight section 19 and is arranged directly opposite to the forward flow channel 121 .

[0040] like Figure 2 As shown, the anti-flashback ejector 1 is provided with a straight section 19, a contraction section 11, a one-way valve section 12 and a diffuser section 18 in sequence along the air intake direction, and the gas nozzle 13 and the primary air inlet 14 are provided in the straight section 19. Under the action of the gas nozzle 13, the primary air enters the straight section 19 and the contraction section 11 through the primary air inlet 14, and the gas and the primary air are mixed to form a mixed gas. The gas nozzle 13 and the forward flow channel 121 of the Tesla valve channel are arranged opposite to each other and are both arranged on the central axis of the anti-flashback ejector 1, which is beneficial for the mixed gas to enter the forward flow channel 121 under the action of the gas nozzle 13, thereby ensuring the pressure of the forward flow of the fluid in the forward flow channel 121, and smoothly realizing the gas supply and combustion.

[0041] In one of the embodiments, along the air intake direction, the length of the diffuser section 18 is less than the length of the contraction section 11. Preferably, the ratio of the length of the diffuser section 18 to the length of the contraction section 11 is 1:2.5-1:2. In this embodiment, a one-way valve section 12 is provided between the contraction section 11 and the diffuser section 18 inside the anti-flashback ejector tube 1, so that the gas and air can continue to be mixed evenly and effectively accelerated in the forward flow in the one-way valve section 12, and the one-way valve section 12 has anti-flashback performance. Therefore, while keeping the length of the contraction section 11 of the existing conventional ejector tube unchanged, the length of the diffuser section 18 after the one-way valve section 12 is provided can be reduced to more than half of the length of the diffuser section 18 of the conventional ejector tube, and the ejection effect remains unchanged; appropriately reducing the length of the diffuser section 18 is conducive to reducing the cost and size of the anti-flashback ejector tube 1, saving materials, and making it easier to process.

[0042] In one embodiment, the anti-flashback ejector tube 1 is a split structure, and the anti-flashback ejector tube 1 includes a first split body 15 and a second split body 16 arranged on both sides of its axis, the first split body 15 and the second split body 16 are sealed and connected, a first one-way valve segment is provided on the first split body 15, and a second one-way valve segment is provided on the second split body 16. After the first split body 15 and the second split body 16 are connected, the first one-way valve segment and the second one-way valve segment are combined to form a one-way valve segment 12.

[0043] Combination Figure 3 The anti-backfire ejector tube 1 is set as a split structure, which is convenient for processing and manufacturing.

[0044] Furthermore, the mating surfaces of the first split body 15 and the second split body 16 are mutually buckled and coincide with any longitudinal section of the anti-flashback ejector tube 1, that is, the first split body 15 and the second split body 16 are the same structure symmetrically arranged relative to any longitudinal section of the anti-flashback ejector tube 1, and the straight section 19, the contraction section 11, the one-way valve section 12 and the expansion section 18 are symmetrically processed on the mating surfaces of the first split body 15 and the second split body 16, as shown in FIG. Figure 3 The first sub-body 15 is provided with a first one-way valve segment, and the second sub-body 16 is provided with a second one-way valve segment. When the first sub-body 15 and the second sub-body 16 are connected, the first one-way valve segment and the second one-way valve segment are combined to form a one-way valve segment 12, that is, a Tesla valve channel is formed. Specifically, the first one-way valve segment and the second one-way valve segment are groove structures processed on the first sub-body 15 and the second sub-body 16 respectively, and the straight section 19, the contraction section 11 and the expansion section 18 are inner hole structures on the first sub-body 15 and the second sub-body 16.

[0045] Furthermore, a sealing structure is provided on the mating surface of the first sub-body 15 and the second sub-body 16, and the sealing structure is provided on the first sub-body 15 or the second sub-body 16, or both the first sub-body 15 and the second sub-body 16 are provided with a sealing structure, so as to facilitate a sealed connection between the two. The sealing structure can be a rubber sealing pad or a sealing glue, and the sealing structure can be clamped and fixed when the first sub-body 15 and the second sub-body 16 are connected.

[0046] In one embodiment, the first split body 15 is provided with a first connecting ear 151 on both sides of its mating surface, and the second split body 16 is provided with a second connecting ear 161 on both sides of its mating surface. The first connecting ear 151 and the second connecting ear 161 at corresponding positions on the first split body 15 and the second split body 16 are fastened together by a connecting piece 17.

[0047] like Figure 3 The first split body 15 is provided with two first connecting ears 151 on both sides of its mating surface, and the first connecting ear 151 is provided with a first connecting hole. The second split body 16 is provided with two second connecting ears 161 on both sides of its mating surface, and the second connecting ears 161 are provided with a second connecting hole 162. The first connecting ears 151 and the second connecting ears 161 are opposite to each other. The connecting member 17 is a bolt or a screw. The connecting member 17 passes through the first connecting hole and the second connecting hole 162 at relative positions and is threadedly fixed or locked by a nut to realize the detachable connection between the first split body 15 and the second split body 16.

[0048] In an embodiment of the utility model, a gas stove is also provided, including a burner head 2 and the anti-flashback ejector tube 1 provided in any of the above embodiments, the burner head 2 has a furnace cavity 21, the anti-flashback ejector tube 1 is connected to the burner head 2, and the diffusion section 18 of the anti-flashback ejector tube 1 is connected to the furnace cavity 21.

[0049] In the gas stove, when the gas and the primary air are mixed, the mixed gas is unidirectionally conducted through the one-way valve section 12 into the diffuser section 18 and the furnace chamber 21 to participate in combustion. Due to the one-way conduction function of the one-way valve section 12, the flame or gas in the furnace chamber 21 and the diffuser section 18 can be reversely cut off, thereby realizing backfire prevention; the one-way valve section 12 is arranged inside the anti-backfire ejector pipe 1, making full use of the structural characteristics of the ejector pipe, realizing backfire prevention without adding additional parts, and reducing the cost of using anti-backfire materials.

[0050] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Anti-flashback ejector tube, It is characterized in that The interior of the anti-flashback ejector pipe (1) is provided with a contraction section (11), a one-way valve section (12) and a diffuser section (18) which are interconnected in sequence along the air intake direction; the one-way valve section (12) is configured to conduct the mixed gas from the contraction section (11) to the diffuser section (18) in a one-way manner.

2. The anti-flashback ejector tube according to claim 1, It is characterized in that The one-way valve section (12) is provided with a Tesla valve channel, and the Tesla valve channel is coaxially arranged with the central axis of the anti-flashback ejector tube (1).

3. The anti-flashback ejector tube according to claim 2, It is characterized in that The Tesla valve channel comprises a forward flow channel (121), a plurality of resistance flow channels (122) and a plurality of flow diverter blocks (123); one end of the forward flow channel (121) is connected to the contraction section (11), and the other end of the forward flow channel (121) is connected to the expansion section (18); the plurality of flow diverter blocks (123) are arranged on both sides of the forward flow channel (121); the resistance flow channel (122) is arranged around the flow diverter blocks (123), and both ends of the resistance flow channel (122) are connected to the forward flow channel (121).

4. The anti-flashback ejector tube according to claim 3, It is characterized in that The number of the diverter blocks (123) on each side of the forward flow channel (121) is 3-4.

5. The anti-flashback ejector tube according to claim 3, It is characterized in that The anti-flashback ejector pipe (1) is also provided with a straight section (19), the straight section (19) being arranged at the air inlet of the anti-flashback ejector pipe (1) and connected to the air inlet side of the contraction section (11); the anti-flashback ejector pipe (1) is provided with a gas nozzle (13), the gas nozzle (13) being arranged in the straight section (19) and facing the forward flow channel (121).

6. The anti-flashback ejector tube according to claim 1, It is characterized in that Along the air intake direction, the ratio of the length of the diffuser section (18) to the length of the contraction section (11) is 1:2-1:2.

5.

7. The anti-flashback ejector tube according to claim 1, It is characterized in that The anti-flashback ejector tube (1) comprises a first sub-body (15) and a second sub-body (16) arranged along two sides of its central axis, the first sub-body (15) and the second sub-body (16) being sealed and connected, the first sub-body (15) being provided with a first one-way valve segment, the second sub-body (16) being provided with a second one-way valve segment, and after the first sub-body (15) and the second sub-body (16) are connected, the first one-way valve segment and the second one-way valve segment are combined to form the one-way valve segment (12).

8. The anti-flashback ejector tube according to claim 7, It is characterized in that A sealing structure is provided between the first sub-body (15) and the second sub-body (16), and the sealing structure is a rubber pad or a sealing adhesive provided on the first sub-body (15) and / or the second sub-body (16).

9. The anti-flashback ejector tube according to claim 7, It is characterized in that The first split body (15) is provided with first connecting ears (151) on both sides of its mating surface, and the second split body (16) is provided with second connecting ears (161) on both sides of its mating surface. The first connecting ears (151) and the second connecting ears (161) at corresponding positions on the first split body (15) and the second split body (16) are fastened together by a connecting piece (17).

10. Gas stove, It is characterized in that It comprises a furnace head (2) and the anti-flashback ejector tube (1) as claimed in any one of claims 1 to 9, wherein the furnace head (2) has a furnace cavity (21), the anti-flashback ejector tube (1) is connected to the furnace head (2), and the diffuser section (18) of the anti-flashback ejector tube (1) is connected to the furnace cavity (21).

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