JP6148493B2 - Gas burner - Google Patents

Description

  The present invention relates to a gas burner provided with a subchamber.

  Patent Document 1 discloses a gas furnace burner for burning a mixed gas obtained by mixing a fuel gas ejected from a nozzle and primary air sucked along with the ejection of the fuel gas. This furnace gas burner includes a burner body to which fuel gas ejected from a nozzle and primary air are supplied, and in addition, a burner cap mounted on the burner body. On the lower surface of the burner cap, a plurality of flame hole grooves extending from the center side of the burner cap toward the outer peripheral side are formed in the circumferential direction of the burner cap. In other words, this gas furnace burner is provided with a plurality of flame holes formed by the flame hole groove and the upper surface of the burner body in the circumferential direction of the burner cap. A gas passage for supplying the mixed gas to the flame hole groove is formed in the burner body, and the mixed gas supplied from the gas passage to the flame hole groove is discharged from the flame hole outlet to the outer peripheral side of the burner cap. The mixed gas is combusted.

  In order to change the fire power of this type of gas burner from large fire to small fire, the amount of fuel gas supplied from the nozzle to the burner body is reduced. However, when the supply amount of the fuel gas is suddenly reduced, a large amount of primary air sucked as the fuel gas is ejected from the nozzle is instantaneously (about 0.5 seconds) supplied to the burner body due to inertia. there is a possibility. That is, in this case, the change in the supply amount of the primary air is slightly delayed with respect to the change in the supply amount of the fuel gas, which may cause the primary air to be temporarily excessively supplied to the burner body. For this reason, when the heating power of the gas burner is changed from a large fire to a small fire, an air-rich mixed gas having a high primary air mixing ratio may be supplied to the flame hole outlet, resulting in poor combustion.

  Here, in the gas burner of Patent Document 1, a sub-chamber is formed in the burner body in order to suppress the combustion failure. The sub-chamber has a chamber inlet communicating with the gas passage and a chamber outlet formed on the upper surface of the burner body and facing the flame hole groove. A part of the mixed gas supplied to the gas passage is supplied from the chamber inlet to the sub-chamber at the time of combustion, and this mixed gas is supplied from the chamber outlet to the flame hole groove. For this reason, when the heating power of the gas burner is changed from a large fire to a small fire, the mixed gas stored in the sub-chamber at the time of combustion in the large-fire state is caused by the air-rich mixed gas supplied from the gas passage to the sub-chamber. It is pushed out into the hole groove so that the combustion is maintained when the heating power is suddenly changed from a large fire to a small fire.

Japanese Patent Laid-Open No. 10-205716

  By the way, in the gas burner for a furnace according to Patent Document 1, when the heating power is changed from a large fire to a small fire, the pressure in the gas passage becomes lower than the pressure in the sub-chamber, and the flame hole from the sub-chamber The mixed gas supplied to the groove for use flows to the gas passage side, which makes it difficult for the mixed gas in the sub-chamber to be supplied to the flame hole outlet, resulting in poor combustion.

  Further, when the chamber outlet is formed on the upper surface of the burner body as in Patent Document 1, the mixed gas in the sub-chamber is discharged upward from the chamber outlet. For this reason, there is a concern that the flame formed at the flame hole outlet leading to the sub-chamber is deflected upward due to the influence of the mixed gas discharged upward from the chamber outlet.

  The present invention has been made in view of the above circumstances, and can more reliably prevent a combustion failure when the heating power is changed from a large fire to a small fire, and at the flame hole outlet leading to the sub-chamber. It is an object of the present invention to provide a gas burner in which the direction of the formed flame is difficult to deflect upward.

In order to solve the above problems, a gas burner according to the present invention is disposed on a burner main body to which fuel gas ejected from a nozzle and primary air sucked as the fuel gas is ejected are supplied. A plurality of flame hole grooves extending from the center side of the burner cap toward the outer peripheral side in the circumferential direction of the burner cap, and the flame hole groove; A plurality of flame holes that are formed on the upper surface of the burner body and open to the outer peripheral side of the burner cap are formed in the circumferential direction of the burner cap, and the burner body includes the fuel gas supplied from the nozzle and the primary air A gas passage for supplying a mixed gas from the passage outlet to each of the flame hole grooves, and facing the passage outlet in the flame hole groove. Was the first place, the burner body further includes a sub-chamber, said sub-chamber includes a chamber inlet communicating with the gas passage, provided on the upper surface of the burner body and opened upward, groove the burner ports And a chamber outlet facing a location located on the outer peripheral side of the burner cap with respect to the first location, and a location facing the chamber exit in the flame hole groove as a second location, A weir is provided between the first location and the second location, the passage outlet is formed in an annular shape on the upper surface of the burner body, and at least a part of the chamber outlet is the outermost portion of the passage outlet in plan view. It is characterized by being provided inside the periphery.

  Moreover, it is preferable that the whole chamber outlet is provided inside the outermost peripheral edge of the passage outlet in a plan view.

  In the invention which concerns on Claim 1, the flow which goes to the 1st location side of the mixed gas supplied from the chamber exit to the 2nd location of the flame hole groove | channel is interrupted | blocked by the dam part provided in the groove for flame holes be able to. For this reason, the mixed gas in the sub-chamber becomes easy to be supplied to the flame hole outlet, thereby making it difficult to cause poor combustion when the heating power is changed from a large fire to a small fire. Further, at least a part of the chamber outlet is provided inside the outermost peripheral edge of the passage outlet in a plan view. For this reason, a chamber exit can be formed in the position near the burner cap center side, and the distance from a chamber exit to a flame hole exit can be lengthened. That is, it is possible to lengthen a section in which the mixed gas existing in the second portion of the flame hole groove flows in a substantially horizontal direction until it reaches the flame hole outlet, whereby the mixed gas blown out from the flame hole outlet is directed upward. It becomes difficult to deflect. Therefore, it is possible to suppress the upward deflection of the flame formed at the flame hole outlet.

  In addition, in the invention according to claim 2, in addition to the effect of the invention according to claim 1, the chamber outlet is formed at a position closer to the burner cap center side, from the chamber outlet to the flame hole outlet. It is possible to further suppress the upward deflection of the flame formed at the flame hole outlet.

It is sectional drawing in the formation location of the groove for flame holes corresponding to the chamber exit of the gas burner of an example of embodiment of this invention. It is sectional drawing which shows the state which provided the gas burner same as the above in the top plate of the furnace. It is a perspective view of a gas burner same as the above. It is a perspective view of the gas burner which removed the burner cap same as the above. It is sectional drawing in the formation location of the groove | channel for flame holes in which mixed gas is not supplied from the chamber exit of the gas burner same as the above. It is the perspective view seen from the lower surface side of the burner cap of a gas burner same as the above. In the top view of the gas burner which removed the burner cap same as the above, it is explanatory drawing which represented the part in which a chamber is formed by hatching. It is sectional drawing in the formation location of the groove | channel for flame holes corresponding to the chamber exit of the gas burner of another example.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. The gas burner 1 of this embodiment is a gas furnace burner for a furnace, and is used, for example, as a burner used for a built-in furnace installed in a kitchen table or the like, or as a burner for a table furnace placed on a furnace table or the like. FIG. 2 shows a cross-sectional view when the gas burner 1 is provided on the top plate 20 of the furnace 2. The gas burner 1 may be provided in equipment other than the furnace 2.

  The gas burner 1 includes a burner body 3, a burner cap 4, a nozzle 5, a damper 6, and a burner cover 7.

  The burner body 3 includes a burner base 8 and a burner body 9 provided on the burner base 8. The burner base 8 and the burner body 9 are made of aluminum die cast. The burner base 8 and the burner body 9 may be formed of a material other than aluminum.

  The burner base 8 has an inner cylinder portion 80, a flange portion 81, and a mixing tube portion 82. The inner cylinder part 80 is formed in the cylindrical shape penetrated up and down. The flange part 81 protrudes from the lower end part of the inner cylinder part 80 toward the outer peripheral side of the inner cylinder part 80. The flange portion 81 is formed with a communication port 810 penetrating vertically. One end of the mixing tube portion 82 is connected to the lower surface of the flange portion 81 so as to surround the communication port 810. The other end side of the mixing tube portion 82 protrudes toward the outer peripheral side of the flange portion 81, and the opening at the protruding end is a gas supply port 820. The gas supply port 820 communicates with the communication port 810 through a space in the mixing tube portion 82.

  The burner body 9 has an outer cylinder part 90 and a flange part 91. The outer cylinder part 90 is formed in the cylindrical shape penetrated up and down. The flange part 91 protrudes from the lower end part of the outer cylinder part 90 toward the outer peripheral side of the outer cylinder part 90. The flange portion 91 is placed in a sealed state on the flange portion 81 of the burner base 8, and the burner body 9 is connected to the burner base 8 in this state.

  When the burner body 3 is provided in the furnace 2, for example, as shown in FIG. 2, a burner ring 21 is attached to the hole edge of the top plate 20 of the furnace 2, and the burner body 3 has a seal member 22 inside the burner ring 21. It is inserted through.

  The outer cylinder part 90 of the burner body 9 has a larger diameter than the inner cylinder part 80 of the burner base 8 and is arranged on the outer peripheral side of the inner cylinder part 80 via a gap. As a result, the burner body 3 is formed with a groove-shaped air passage 32 that is formed in the inner cylinder part 80, the flange part 81, and the outer cylinder part 90 and has an annular shape with a horizontal cross section that opens upward.

  The air passage 32 communicates with the gas supply port 820 through the communication port 810 and the space in the mixing pipe portion 82 in this order. As a result, the gas passage 30 including the mixing pipe portion 82, the communication port 810, and the ventilation path 32 is formed in the burner body 3. The passage outlet 300 of the gas passage 30 is an upper end opening of the air passage 32 and is formed by the upper end portion of the inner cylinder portion 80 and the upper end portion of the outer cylinder portion 90. The passage outlet 300 is formed in an annular shape in plan view on the upper surface of the burner body 3 (see FIGS. 4 and 7).

  The burner cap 4 is made of aluminum die cast. The burner cap 4 may be formed of a material other than aluminum.

  The burner cap 4 includes a plate-like annular portion 40 that is substantially annular in plan view, and a cylindrical portion 41 that protrudes downward from the inner edge portion of the annular portion 40. The annular portion 40 constitutes the upper surface portion of the burner cap 4, and the burner cap 4 has an annular shape in plan view.

  A burner cover 7 is attached on the annular portion 40 of the burner cap 4. A gap 11 is formed between the upper surface of the burner cap 4 and the lower surface of the burner cover 7 to allow communication between the inner peripheral side (center side) and the outer peripheral side of the burner cap 4.

  The annular portion 40 of the burner cap 4 is placed on the upper end surface of the outer cylinder portion 90 that is the upper surface of the burner body 3.

  A cylindrical portion 41 protruding downward from the annular portion 40 is fitted into the inner cylindrical portion 80 of the burner body 3. As a result, the burner cap 4 is immovable in the horizontal direction with respect to the burner body 3. Although not shown, the tubular portion 41 is locked to the inner tubular portion 80 of the burner body 3 so as not to rotate in the circumferential direction. As a result, the burner cap 4 cannot rotate in the circumferential direction with respect to the burner body 3. That is, the burner cap 4 is placed in a state of being positioned with respect to the burner body 3.

  The space in the cylindrical part 41 communicates with the space in the inner cylinder part 80 of the burner body 3 on the lower side, and communicates with the gap 11 formed between the burner cap 4 and the burner cover 7 on the upper side. At the time of combustion of the gas burner 1, the air existing below the burner base 8 burns as secondary air through the space in the inner cylindrical portion 80, the space in the cylindrical portion 41, and the gap 11 in order. Is supplied to the outer peripheral side of the burner cap 4.

  As shown in FIG. 6, a large number of flame hole grooves 42 extending from the inner peripheral side to the outer peripheral side of the burner cap 4 in the circumferential direction of the burner cap 4 are provided on the lower surface of the annular portion 40 of the burner cap 4. ) Is formed. These flame hole grooves 42 are substantially parallel to the radial direction of the burner cap 4, and are formed radially with respect to the center of the annular portion 40.

  A partitioning portion 401 protruding downward is formed between adjacent flame hole grooves 42 in the annular portion 40. Most of the adjacent flame hole grooves 42 are partitioned by the partition portions 401.

  A first recess 402 that is recessed upward is formed at the end of each partition 401 on the inner peripheral side of the burner cap 4. The first recesses 402 of the partition portions 401 allow the end portions on the inner peripheral side of the burner cap 4 of the flame hole grooves 42 on both sides to communicate with each other. As a result, the inner peripheral side end of the annular portion 40 is constituted by the end portions on the inner peripheral side of the burner cap 4 of the numerous flame hole grooves 42 and the multiple first recesses 402, and is viewed from the bottom. An annular groove 403 that opens downward in an annular shape is formed.

  On the lower surface of the annular portion 40 constituting the upper bottom surface of each flame hole groove 42, a partition portion 422 that protrudes downward is formed. Each partition part 422 is formed on the outer peripheral side of the burner cap 4 of the flame hole groove 42 and in the center part in the groove width direction, and the part on the outer peripheral side of the burner cap 4 of the flame hole groove 42 is branched into two grooves 420. I am letting.

  The surface of each partition portion 422 facing the outer peripheral side of the burner cap 4 is located in a position confined to the inner peripheral side of the burner cap 4 than the surface facing the outer peripheral side of the burner cap 4 of each partition portion 401. Thus, a void 421 that opens to the outer periphery side of the burner cap 4 is formed on the outer periphery side of the burner cap 4 of the partition portion 422 in each flame hole groove 42. The ends on the outer peripheral side of the burner cap 4 of the groove portions 420 on both sides of each partitioning portion 422 are communicated with each other through a space 421.

  As shown in FIG. 3, the lower surface of each partition portion 401 and the lower surface of each partition portion 422 are placed on the upper end surface of the outer cylinder portion 90. Thus, the annular groove 403 of the burner cap 4 is disposed at a position facing the passage outlet 300 formed on the upper surface of the burner body 3 as shown in FIGS. 1 and 5, and communicates with the gas passage 30. .

  Each flame hole groove 42 of the burner cap 4 forms a flame hole 10 with the upper end surface of the outer cylinder portion 90 which is the upper surface of the burner body 3. That is, in the gas burner 1, many flame holes 10 extending from the inner peripheral side to the outer peripheral side of the burner cap 4 are formed in the circumferential direction of the burner cap 4.

  The flame hole outlet 100, which is the outlet of each flame hole 10, is configured by an end portion of the flame hole groove 42 on the outer peripheral side of the burner cap 4, and an upper end surface of the outer cylinder portion 90 of the burner body 3 facing this. And opens to the outer peripheral side of the burner cap 4. Each flame hole outlet 100 communicates with the annular groove 403 through a space in the flame hole groove 42. Accordingly, each flame hole outlet 100 communicates with the passage outlet 300 of the gas passage 30 of the burner body 3.

  As shown in FIG. 2, the nozzle 5 and the damper 6 are provided at the end of the mixing tube portion 82 of the burner body 3 on the gas supply port 820 side. The nozzle 5 and the damper 6 are attached to the burner base 8. As described above, when the gas burner 1 is incorporated into the furnace 2, the nozzle 5 and the damper 6 are disposed in the furnace 2 together with the mixing tube portion 82 of the burner body 3.

  The nozzle 5 is connected to a gas supply path 23 provided in the furnace 2 and receives supply of fuel gas from the gas supply path 23. The amount of fuel gas supplied from the gas supply path 23 to the nozzle 5 can be changed by the user of the gas burner 1. When the gas burner 1 is provided in the furnace 2, for example, an instrument plug is provided in the gas supply path 23, and this instrument plug is operated by an operation unit (for example, a knob on the operation panel) provided in the front part of the furnace 2. Thus, the amount of fuel gas supplied to the nozzle 5 is changed.

  A nozzle 50 is formed at the tip of the nozzle 5 so as to face the center of the gas supply port 820. The fuel gas supplied to the nozzle 5 is ejected from the ejection port 50 into the mixing tube portion 82. Further, as the fuel gas is ejected from the nozzle 5, the air around the nozzle 5 is sucked, and this air is supplied into the mixing pipe portion 82 together with the fuel gas ejected from the nozzle 5 as primary air. Yes.

  The damper 6 is disposed, for example, in the gas supply port 820, and the opening area of the damper 6 is a predetermined opening area corresponding to the gas fuel used, but the gas supply port 820 is set according to the operation of the operation unit. You may use what changes the opening area of. Even when the damper 6 is provided in this way, when the heating power of the gas burner 1 is changed from a large fire to a small fire, a large amount of primary air may be instantaneously supplied to the burner body 3 due to inertia. .

  As described above, the fuel gas and the primary air supplied to the mixing pipe portion 82 from the nozzle 50 through the damper 6 are mixed in the mixing pipe portion 82 in the process toward the communication port 810. This mixed gas is supplied from the gas passage 30 to each flame hole 10. That is, the mixed gas in the mixing tube portion 82 is supplied to the annular groove 403 of the upper burner cap 4 shown in FIGS. 1 and 5 through the communication port 810 and the ventilation path 32 of the burner body 3, and thereafter It is supplied to each flame hole groove 42 located on the outer peripheral side of the burner cap 4 with respect to the groove 403. The mixed gas thus supplied to each flame hole groove 42 merges through the voids 421 through the groove parts 420 on both sides of the partition part 422, and is then discharged from the flame hole outlet 100.

  As shown in FIG. 4, in the upper end surface of the outer cylindrical portion 90 of the burner body 3, the portion facing the outer peripheral side end of the annular portion 40 of the burner cap 4 is more marked than the portion located on the inner peripheral side. It is a paragraph surface 900. The paragraph surface 900 is formed over the circumferential direction of the outer cylinder part 90.

  A portion of the upper end surface of the outer cylindrical portion 90 on the inner peripheral side of the paragraph surface 900 is a mounting portion 901 on which the inner peripheral side of each partitioning portion 401 of the burner cap 4 and each partitioning portion 422 are placed. . As shown in FIGS. 1 and 5, the mounting portion 901, the lower surface on the inner peripheral side of each partitioning portion 401 mounted on the mounting portion 901, and the lower surface of each partitioning portion 422 are directed toward the outer peripheral side of the burner cap 4. Inclined at substantially the same angle.

  In the gas burner 1, as shown in FIG. 3, a large number (a plurality) of flame holding holes 12 are formed in the circumferential direction of the burner cap 4. Each flame-holding hole 12 is composed of a paragraph surface 900 of the burner main body 3 and a lower surface on the outer peripheral side of the partitioning portion 401 of the burner cap 4 facing this. Hereinafter, the flame hole 10 is referred to as a main flame hole 10 in order to distinguish the flame holding hole 12 and the flame hole 10.

  Each flame-holding hole 12 communicates the ends of the main flame holes 10 on both sides of the burner cap 4 on the outer peripheral side. As shown in FIG. 6, on the lower surface of each partition 401 of the burner cap 4, a second recess 404 that is recessed upward is formed in a portion located on the outer peripheral side of the burner cap 4 with respect to the first recess 402. Has been. The inner peripheral side of the burner cap 4 of the second recess 404 communicates with the first recess 402 through a void 404a. A part of the mixed gas supplied from the gas passage 30 of the burner body 3 to the annular groove 403 of the burner cap 4 passes through the first recess 402, the space 404a, and the second recess 404 in order to each flame holding hole 12. It comes to be supplied.

  One of the partition portions 401 of the burner cap 4 is a partition portion 401a that allows a gas mixture for ignition to pass therethrough. The outer peripheral side of the burner cap 4 of the second recess 404 of the partition portion 401a communicates with the outer peripheral side of the burner cap 4 through the void 404b. A part of the mixed gas supplied from the gas passage 30 of the burner body 3 to the annular groove 403 of the burner cap 4 is a space 404a from the first recess 402, a second recess 404 of the partition 401a, and a space 404b. Are sequentially supplied to the outer peripheral side of the burner cap 4.

  On the upper portion of the partitioning portion 401a, a flange portion 407 protruding to the outer peripheral side of the burner cap 4 is formed. A spark target 13 is provided on the lower surface of the flange portion 407. As shown in FIG. 2, a spark plug 14 that generates an ignition spark between the burner body 3 and the flange 91 on the burner body 3 and the flange 91 on the spark target 13 is provided. .

  In order to burn the gas burner 1, an ignition spark is generated by the spark plug 14 in a state where the fuel gas ejected from the nozzle 5 and the primary air are supplied to the burner body 3. Thereby, the mixed gas supplied to the outer peripheral side of the burner cap 4 from the second recess 404 of the partition part 401a through the space 404b is ignited, and an ignition flame is formed at a position corresponding to the space 404b. . This ignition flame is transferred to the gas mixture supplied from the flame holding holes 12 to the outer peripheral side of the burner cap 4 or to the gas mixture supplied from the main flame holes 10 to the outer peripheral side of the burner cap 4. A flame is formed at each flame hole outlet 100 and each flame holding hole 12 outlet of the burner 1.

  When the heating power of the gas burner 1 is changed from a large fire to a small fire, the ratio of the primary air sucked with the ejection of the fuel gas from the nozzle 5 to the amount of the fuel gas ejected to the burner body 3 due to inertia is instantaneous. In this case, there is a concern that an air-rich mixed gas having a high primary air mixing ratio is supplied to the flame hole outlet 100 to cause poor combustion. In order to improve this point, in the gas burner 1 of this embodiment, the sub-chamber 31 is formed in the burner body 3 as shown in FIG.

  The sub chamber 31 is formed in the outer cylinder portion 90 of the burner body 9. The sub-chamber 31 is formed within the thickness of the outer cylinder portion 90 so as to be a chamber independent of the ventilation path 32. As shown in FIG. 7, the sub-chamber 31 is located outside the horizontal cross-section annular air passage 32 that forms the downstream portion of the gas passage 30, and surrounds the outer cylinder portion 90 along the outer peripheral edge of the air passage 32. It is formed in a part of the direction.

  The subchamber 31 has a chamber inlet 310 and a chamber outlet 311. The chamber inlet 310 is formed at one end of the sub-chamber 31 that extends in the circumferential direction of the outer cylinder 90 in plan view. The sub-chamber 31 communicates with the air passage 32 through the chamber inlet 310.

  The chamber outlet 311 is provided on the upper end surface of the outer cylinder portion 90 and opens upward. The chamber outlet 311 is formed at the end of the sub-chamber 31 extending in the circumferential direction of the outer cylinder portion 90 on the side opposite to the chamber inlet 310. The chamber outlet 311 is located at a position facing one of the flame hole grooves 42 of the burner cap 4, that is, the flame hole groove 42 shown in FIG. 1, and this flame hole groove 42. It is located in the inner peripheral side of the burner cap 4 rather than the partition part 422.

  Hereinafter, in order to distinguish the flame hole groove 42 facing the chamber outlet 311, that is, the flame hole groove 42 to which the mixed gas is supplied from the sub chamber 31, from the other flame hole groove 42, the flame hole groove 42 a. It describes. In order to distinguish the main flame hole 10 formed using the flame hole groove 42a from the other main flame holes 10, the main flame hole 10a is described as a main flame hole 10a, and the flame hole outlet 100 of the main flame hole 10a is designated as a flame hole. It describes as the exit 100a.

  As shown in FIGS. 4 and 7, a part of the outer cylinder portion 90 of the burner body 3 in the circumferential direction is a protruding portion 902 that protrudes to the inner peripheral side from the other portion. As a result, the annular passage outlet 300 in plan view has a partial width in the circumferential direction (the interval between the outer cylinder portion 90 and the inner cylinder portion 80) smaller than the width of the other portion. The outer peripheral edge of the part which became becomes located in the inner peripheral side rather than the outer peripheral edge of the other part used as the outermost peripheral edge. The chamber outlet 311 is formed on the upper end surface of the projecting portion 902 of the outer cylinder portion 90 and is located on the inner side of the outermost peripheral edge of the annular passage outlet 300 in plan view. The chamber outlet 311 is formed in a substantially rectangular shape along the passage outlet 300 in plan view.

  As shown in FIG. 1, when the location facing the passage outlet 300 (specifically, the narrowed circumferential portion) in the flame hole 42 a is a first location 423, the chamber outlet 311 is: In the flame hole groove 42a, it faces a location located on the outer peripheral side of the burner cap 4 with respect to the first location 423. Hereinafter, the location facing the chamber outlet 311 in the flame hole groove 42 a is referred to as a second location 424.

  At the time of combustion of the gas burner 1, a part of the mixed gas supplied to the air passage 32 of the gas burner 1 is supplied from the chamber inlet 310 into the sub-chamber 31, and this mixed gas passes through the flame hole groove 42a. Supplyed to the second location 424. During combustion of the gas burner 1, a part of the mixed gas supplied to the main flame hole 10 and the flame holding hole 12 through the gas passage 30 flows and is stored in the sub chamber 31.

  The flow path area of the chamber inlet 310 is smaller than the flow path area of the chamber outlet 311. For this reason, the mixed gas in the sub-chamber 31 flows out stably from the chamber outlet 311 to the flame hole groove 42a. Here, the said flow path area is an area in the cross section orthogonal to the flow direction of mixed gas.

  By providing the sub-chamber 31, when the heating power is changed from a large fire to a small fire during the combustion of the gas burner 1, the mixed gas stored in the sub-chamber 31 during the combustion in the large fire state is transferred from the air passage 32. The mixed gas supplied to the chamber inlet 310 is pushed out from the chamber outlet 311 to the second portion 424 of the flame hole groove 42a. On the other hand, as described above, the mixed gas directly supplied from the ventilation path 32 to the first portion 423 of the flame hole groove 42a through the passage outlet 300 moves toward the flame hole outlet 100a along the flame hole groove 42a. . Then, the mixed gas blown upward from the chamber outlet 311 is merged with the mixed gas at the second location 424, and then discharged from the flame hole outlet 100 a to the outer peripheral side of the burner cap 4. Thereby, when a thermal power is suddenly changed from a large fire to a small fire, it can suppress that the ratio of the primary air in the mixed gas blown out from the flame hole exit 100a increases. Therefore, the flame formed at the flame hole outlet 100a is difficult to disappear, and the combustion of the gas burner 1 can be maintained well.

  In addition, as shown in FIG. 1, between the first location 423 and the second location 424 in the flame hole groove 42 a, the mixed gas supplied from the sub-chamber 31 to the second location 424 of the flame hole groove 42 a A dam portion 33 is provided to block the flow toward the first location 423 side. That is, the weir portion 33 is located downstream of the first location 423 and upstream of the second location 424 when the flow of the mixed gas directly supplied from the passage outlet 300 to the flame hole groove 42a is used as a reference. positioned.

  As shown in FIG. 6, the weir portion 33 of the present embodiment protrudes downward from the lower surface of the annular portion 40 constituting the upper surface of the flame hole groove 42a of the burner cap 4, and the length direction of the flame hole groove 42a. It is comprised by the wall part substantially orthogonal to (the radial direction of the burner cap 4). This dam portion 33 is present in the portion constituting the annular groove 403 in the flame hole groove 42a.

  The weir portion 33 is formed with a gap 330 penetrating in the length direction of the flame hole groove 42 a, and the first position 423 and the second position 424 of the flame hole groove 42 a communicate with each other through the gap 330. . The mixed gas supplied from the passage outlet 300 to the first portion 423 of the flame hole groove 42a is supplied to the flame hole outlet 100a side (second portion 424 side) through the gap 330 formed in the weir portion 33. It is like that.

  The air gap 330 of the present embodiment is formed by a notch formed at the lower end portion of the weir portion 33 leaving both end portions in the circumferential direction of the burner cap 4. Both end portions of the gap 330 in the circumferential direction of the burner cap 4 are located on the inner circumferential side of the burner cap 4 of both groove portions 420 of the flame hole groove 42a. The gap 330 opens toward the outer peripheral side of the burner cap 4 where the flame hole outlet 100a is located. For this reason, the mixed gas that has flowed into the gap 330 from the first location 423 is blown out from the gap 330 toward the outer periphery of the burner cap 4.

  By providing the dam portion 33 in the flame hole groove 42 a as described above, the mixed gas supplied from the chamber outlet 311 to the second location 424 of the flame hole groove 42 a is the first location 423 facing the passage outlet 300. It becomes difficult to flow to the side. For this reason, the mixed gas in the sub-chamber 31 is easily supplied to the flame hole outlet 100a, thereby making it possible to further reduce the occurrence of poor combustion when the heating power is changed from a large fire to a small fire.

  Further, when the mixed gas in the sub-chamber 31 is blown upward from the chamber outlet 311, there is a concern that the flame formed at the flame hole outlet 100a may be deflected upward due to this influence. However, in this embodiment, by opening the gap 330 formed in the dam portion 33 toward the outer peripheral side of the burner cap 4, the mixed gas in the first location 423 of the flame hole groove 42 a Thus, the air is blown out toward the outer peripheral side of the burner cap 4 where the second location 424 is located. For this reason, the mixed gas blown from the gap 330 toward the outer peripheral side of the burner cap 4 makes it difficult for the mixed gas blown from the flame hole outlet 100a to be deflected upward, thereby forming the flame hole outlet 100a. This makes it difficult to deflect upward.

  Further, as described above, the chamber outlet 311 is located on the inner side of the outermost peripheral edge of the annular passage outlet 300 in plan view (see FIGS. 4 and 7). Therefore, a long distance La (see FIG. 1) in the radial direction of the burner cap 4 from the chamber outlet 311 to the flame hole outlet 100a is secured, and this distance La and the diameter of the burner cap 4 from the passage outlet 300 to the flame hole outlet 100a are secured. The difference ΔL (ΔL = La−Lb) from the distance Lb (see FIG. 5) in the direction can be reduced. Accordingly, it is possible to lengthen a section in which the mixed gas existing in the second portion 424 of the flame hole groove 42a flows in a substantially horizontal direction before reaching the flame hole outlet 100a, and thereby the mixture blown out from the flame hole outlet 100a. The gas is difficult to deflect upward. Therefore, it is possible to further suppress the upward deflection of the flame formed at the flame hole outlet 100a.

  As shown in FIG. 6, guide walls 44 projecting toward the inner peripheral side of the burner cap 4 are formed at the ends of the partitioning portions 401 on both sides of the flame hole groove 42 a on the flame hole groove 42 a side. The end of each guide wall 44 on the inner peripheral side of the burner cap 4 is connected to the corresponding side end of the weir 33, and both guide walls 44 are connected to the first portion 423 of the flame hole groove 42a and the flame. The first recess 402 formed in the partition 401 located on both sides of the hole groove 42a is partitioned. Both guide walls 44 function as a guide for guiding the mixed gas discharged from the gap 330 of the dam portion 33 toward the outer peripheral side of the burner cap 4 in the flame hole groove 42a to the flame hole outlet 100a side. For this reason, the mixed gas effectively flows to the flame hole outlet 100a side, and the flame formed at the flame hole outlet 100a is more difficult to deflect upward. Both the guide walls 44 also function as a dam portion for preventing the mixed gas supplied from the chamber outlet 311 to the second location 424 from flowing out to the first recess 402.

  In the flame hole groove 42 of the burner cap 4 other than the flame hole groove 42a facing the chamber outlet 311, the upper bottom surface of the flame hole groove 42 is as shown in FIG. The inclined surface 425 becomes higher as it goes to the outer peripheral side of the burner cap 4 over almost the whole in the radial direction of the burner cap 4. On the other hand, in the flame hole groove a facing the chamber outlet 311, a part of the upper bottom surface in the radial direction of the burner cap 4 is a horizontal surface 426 as shown in FIG. 1.

  Specifically, on the upper bottom surface of the flame hole groove 42 a, each of the portion facing the chamber outlet 311 and the end portion on the outer peripheral side of the burner cap 4 is a horizontal surface 426, and between these two surfaces 426. The portion is an inclined surface 427 that becomes higher toward the outer peripheral side of the burner cap 4. Thus, by making a part of the upper bottom surface of the flame hole groove 42a a horizontal surface 426, the mixed gas in the flame hole groove 42a is more easily discharged toward the outer peripheral side of the burner cap 4, thereby The flame formed at the hole outlet 100a is more difficult to deflect upward. Each surface 426 may be a surface that becomes lower toward the outer peripheral side of the burner cap 4.

  In the present embodiment, the dam portion 33 provided in the flame hole groove 42a is formed of a wall portion. However, the shape of the dam portion 33 provided in the flame hole groove 42a is not limited to a wall shape, and may be, for example, a block shape. Good. In the present embodiment, the weir portion 33 is formed on the burner cap 4, but it may be formed on the burner body 3 side, for example, protruding upward from the upper end surface of the outer cylinder portion 90.

  In addition, the gap 330 formed in the dam portion 33 of the present embodiment is a notch, but may be a hole. Furthermore, for example, as shown in FIG. 8, the dam portion 33 does not need to be provided with a gap 330 that allows the first portion 423 and the second portion 424 of the flame hole groove 42 a to communicate with each other. That is, in this example, the first portion 423 and the second portion 424 are not communicated with each other in the flame hole groove 42a, and the mixing directly supplied from the passage outlet 300 of the burner body 3 to the annular groove 403 of the burner cap 4 is performed. The gas is not supplied to the flame hole outlet 100a.

  Further, in the present embodiment, all of the chamber outlets 311 are formed inside the outermost peripheral edge of the passage outlet 300 in a plan view, but only a part of the chamber outlet 311 is formed from the outermost peripheral edge of the passage outlet 300. May also be formed inside.

  Further, in the present embodiment, the partition portion 422 is formed in the flame hole groove 42 and branched into the two groove portions 420, but the partition portion 422 can be omitted. Further, the nozzle 5 may be attached to the apparatus instead of the burner body 3. The damper 6 can be omitted.

1 Gas burner 3 Burner body 4 Burner cap 5 Nozzle 10a Main flame hole (flame hole)
30 Gas passage 31 Subchamber 33 Weir (wall)
42a Flame hole groove 300 Passage outlet 310 Chamber inlet 311 Chamber outlet 330 Air gap (notch)
423 1st place 424 2nd place

Claims (2)

A burner main body to which fuel gas ejected from a nozzle and primary air sucked along with the ejection of the fuel gas are supplied;
A burner cap disposed on the burner body,
A plurality of flame hole grooves extending from the center side of the burner cap toward the outer peripheral side are formed in the circumferential direction of the burner cap on the lower surface of the burner cap, and are configured by the flame hole groove and the upper surface of the burner body. A plurality of flame holes opened in the circumferential direction of the burner cap,
The burner body is
A gas passage for supplying a mixed gas, which is a mixture of the fuel gas supplied from the nozzle and the primary air, to each flame hole groove from a passage outlet;
In the flame hole groove, a location facing the passage outlet is a first location,
The burner body further includes a sub-chamber,
The sub-chamber is
A chamber inlet communicating with the gas passage;
A chamber outlet provided on the upper surface of the burner body , opening upward, and facing a location located on the outer peripheral side of the burner cap from the first location in the flame hole groove;
The location facing the chamber outlet in the groove for the flame hole is a second location,
A dam portion is provided between the first location and the second location of the flame hole groove, the passage outlet is formed in an annular shape on the upper surface of the burner body, and at least a part of the chamber outlet is seen in plan view. A gas burner provided inside the outermost peripheral edge of the passage outlet.   2. The gas burner according to claim 1, wherein all of the chamber outlets are provided inside the outermost peripheral edge of the passage outlet in a plan view.

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