JP6178670B2 - 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 and primary air ejected from a nozzle are supplied, and a burner cap placed 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. As a result, the furnace gas burner is provided with a plurality of flame holes formed in the circumferential direction of the burner cap, which are constituted by the flame hole grooves and the upper surface of the burner body. The burner body is formed with a ventilation path for supplying the mixed gas to the flame hole groove, and the mixed gas supplied from the ventilation path to the flame hole groove is discharged from the outlet of the flame hole to the outer peripheral side of the burner cap. This mixed gas is combusted.

  In order to change the heating 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 may be reduced. However, when the supply amount of the fuel gas suddenly decreases, 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.

  In order to improve this point, a sub-chamber is formed in the burner body of the gas burner disclosed in Patent Document 1. The sub-chamber has an introduction port communicating with the air passage and a lead-out port formed on the upper surface of the burner body and facing the flame hole groove. A part of the mixed gas supplied to the air passage is supplied to the sub chamber at the time of combustion from the inlet, and this mixed gas is supplied from the 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 supplied to the sub-chamber from the subsequent mixed gas (i.e., the air passage). The air-rich mixed gas) is pushed out into the flame hole groove, whereby the combustion is maintained well 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, the time during which good combustion is maintained when the heating power is suddenly changed from a large fire to a small fire can be lengthened by increasing the volume of the sub-chamber. However, when the volume of the sub-chamber is increased, the following inconvenience may occur.

  The mixed gas in the steady state of the small fire is in a gas-rich state with less primary air than in the large fire. For this reason, when the heating power is suddenly changed from a small fire to a large fire, the primary air becomes insufficient during the transition period until the mixed gas in the air passage is replaced, and the flame burning speed at each flame hole outlet is in an appropriate state. The flame may become larger later than that.

  Here, the mixed gas corresponding to the thermal power is easily supplied to the ventilation path even during the transition period. However, an air-rich mixed gas at the time of a small fire exists in the subchamber, and this mixed gas is pushed out by the subsequent mixed gas and supplied to the flame hole in a piston flow manner. For this reason, at the flame hole outlet leading to the sub-chamber, there is a possibility that primary air shortage occurs and the flame formed at the other flame hole outlet becomes larger. Further, the period during which the flame is larger at the flame hole outlet leading to the sub chamber than at the other flame hole outlets becomes longer as the volume of the sub chamber is larger.

  The present invention has been made in view of the above circumstances, and can sufficiently suppress the occurrence of poor combustion when the heating power is rapidly changed from a large fire to a small fire, and the heating power is rapidly increased from a small fire to a large fire. It is an object of the present invention to provide a gas burner in which a larger flame is less likely to be formed at a flame hole outlet leading to a sub-chamber than a flame formed at another flame hole outlet.

In order to solve the above problems, the gas burner of the present invention is supplied with the fuel gas ejected from the nozzle and the primary air sucked along with the ejection of the fuel gas, and mixes the fuel gas and the primary air. the mixed gas to a gas burner for supplying a plurality of fire holes, and the air passage for supplying the mixed gas communication with said flame hole to the burner ports, and a sub-chamber, said sub-chamber, said air passage A part of the mixed gas supplied to the air passage by connecting the inlet and the outlet and connecting the inlet and the outlet, and a part of the mixed gas supplied through the inlet. that has a reservoir becomes a bypass path of the air passage, the reservoir, the plate-like resistance portion serving as a resistance to the flow of the mixed gas flowing toward the outlet port is provided from the inlet Characterized by

  Moreover, it is preferable that the said resistance part protrudes from the inner surface of the said storage part, and is formed in the plate shape along the flow direction of the mixed gas which flows toward the said outlet from the said inlet.

  Moreover, it is preferable that the space where the said resistance part does not exist is formed in the downstream edge part in the said storage part in the downstream rather than the said resistance part.

  In this invention, a plate-shaped resistance part becomes resistance with respect to the flow of the mixed gas which flows through a storage part at the time of combustion of a gas burner. This resistance force increases as the flow rate of the mixed gas passing through the reservoir increases. For this reason, when the heating power of the gas burner is suddenly changed from a small fire to a large fire, the flow of the mixed gas flowing through the reservoir is suppressed, and the outlet of the flame hole leading to the sub-chamber has a reservoir with a small amount of primary air. It becomes difficult to supply the mixed gas. Therefore, the flame formed at the exit of the flame hole leading to the sub-chamber is less likely to be larger than the flame formed at the exit of the other flame hole. Further, since the resistance portion is formed into a plate shape, the volume of the sub chamber is hardly reduced. Therefore, it is possible to sufficiently suppress the occurrence of poor combustion when the heating power is suddenly changed from a large fire to a small fire by the sub chamber.

  Moreover, by forming the resistance portion in a plate shape along the flow direction of the mixed gas flowing from the inlet port toward the outlet port, the flow of the mixed gas in the storage portion is not easily inhibited by the resistor portion. In particular, when the heating power of the gas burner is changed from a large fire to a small fire, since the flow rate of the mixed gas in the storage portion is small, an increase in passage resistance due to the resistance portion can be suppressed. Therefore, the original effect of the sub-chamber of suppressing the occurrence of defective combustion when the heating power is suddenly changed from a large fire to a small fire can be further prevented from being impaired. Moreover, a resistance part can be easily provided only by projecting on the inner surface of the storage part.

  Moreover, immediately after the thermal power of the gas burner is changed from a large fire to a small fire by forming a space where the resistance part does not exist and is located downstream of the resistance part at the downstream end of the storage part, The mixed gas stored in the space is quickly supplied from the outlet to the flame hole groove communicating with the sub chamber. Therefore, the original effect of the sub-chamber of suppressing the occurrence of defective combustion when the heating power is suddenly changed from a large fire to a small fire can be further prevented from being impaired.

The subchamber part in the gas burner of an example of this invention is shown, (a) is explanatory drawing when it sees from upper direction, (b) is explanatory drawing showing the AA 'cross section of (a). 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 a mixed gas is not supplied from the outlet of a gas burner same as the above. It is sectional drawing in the formation location of the groove | channel for flame holes corresponding to the outlet of the gas burner of an example of embodiment of this invention. It is the perspective view which looked at the burner cap of the gas burner same as the above from the lower surface side. It is explanatory drawing which represented the location in which a subchamber is formed in the top view of the gas burner which removed the burner cap same as the above by hatching. The flow of the mixed gas in a sub chamber is shown, (a) is explanatory drawing at the time of providing a resistance part, (b) is explanatory drawing at the time of not providing a resistance part.

  Hereinafter, the present invention will be described with reference to the accompanying drawings. The gas burner 1 of the present embodiment is a gas furnace burner, and is provided, for example, in a built-in furnace installed in a kitchen table or the like, or a table furnace mounted 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 is formed with an air passage 30 through which fuel gas and primary air are supplied, and a sub-chamber 31 (see FIG. 6).

  The burner body 3 of the present embodiment includes a burner base 8 and a burner body 9 that is mounted 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 includes a base part 81 and a lower pipe half part 82. The base portion 81 has an annular shape in plan view, and a cylindrical inner cylinder portion 811 protruding upward is formed on the inner peripheral edge thereof. The lower pipe half 82 protrudes outward from the base 81.

  The burner body 9 includes a main body portion 91 and a pipe upper half portion 92. The main body portion 91 has an annular shape in plan view, and a cylindrical outer tube portion 910 that protrudes upward is formed on the inner peripheral edge thereof. The main body 91 is placed on the base 81 of the burner base 8 so as to overlap.

  The outer cylinder part 910 has a cylindrical shape larger than the inner cylinder part 811 of the burner base 8, and is arranged on the outer peripheral side of the inner cylinder part 811 with a gap 32. The gap 32 has an annular shape in plan view, and is opened upward from between the upper end portion of the outer cylinder portion 910 and the upper end portion of the inner cylinder portion 811 as shown in FIG.

  The upper half portion 92 projects from the main body portion 91 toward the outer side, which is the same direction as the projecting direction of the lower half portion 82. The upper pipe half 92 is disposed so as to overlap the lower pipe half 82, and constitutes the mixing pipe 35 together with the lower pipe half 82.

  As shown in FIG. 2, a lower groove 83 is formed on the upper surface of the burner base 8 from the protruding end of the lower pipe half 82 to the base 81. On the lower surface of the burner body 9, an upper groove 93 extending from the protruding end of the upper pipe half 92 to the main body 91 is formed.

  Between the burner base 8 and the burner body 9 disposed thereon, a hole 34 constituted by a lower groove 83 and an upper groove 93 disposed in accordance therewith is formed. One end of the hole 34 opens from the protruding end of the mixing tube 35, and the other end communicates with the lower end portion of the gap 32 between the outer cylinder portion 910 and the inner cylinder portion 811. The hole in the mixing tube 35 is a part of the hole 34. The hole 34 and the gap 32 constitute an air passage 30 through which fuel gas and primary air are supplied. The inlet 300 of the air passage 30 is constituted by a protruding end portion of the mixing pipe 35. The outlet 301 of the ventilation path 30 is configured by an upper end portion of the gap 32 (a portion between the upper end portion of the outer cylinder portion 910 and the upper end portion of the inner cylinder portion 811), and has an annular shape in plan view.

  For example, as shown in FIG. 2, the burner body 3 is fitted inside a burner ring 21 attached to a hole edge of the top plate 20 of the furnace 2.

  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.

  A burner cover 7 is attached on the annular portion 40 constituting the upper surface portion of the burner cap 4. A gap 11 is formed between the annular portion 40 of the burner cap 4 and the lower surface of the burner cover 7 so that the inner peripheral side (center side) of the burner cap 4 communicates with the outer peripheral side.

  The annular portion 40 of the burner cap 4 is placed on the upper end surface of the outer cylinder portion 910 that becomes 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 811 of the burner body 3.

  During the combustion of the gas burner 1, the air existing below the burner base 8 is burned as secondary air through the space in the inner cylinder portion 811, the space in the cylindrical portion 41, and the gap 11 in order. The burner cap 4 is supplied to the outer peripheral side.

  As shown in FIG. 7, a large number (a plurality of flame hole grooves 42) extending in the circumferential direction of the burner cap 4 are formed 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 these 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 inner peripheral end of the burner cap 4 of a number of flame hole grooves 42 and a number of first recesses 402, and is cylindrical. An annular groove 403 that opens in a circular shape and surrounds the periphery of the portion 41 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 outer peripheral part of the burner cap 4 of the flame hole groove 42 is formed into two groove parts 420. It is branched.

  The surface of each partitioning part 422 facing the outer peripheral side of the burner cap 4 is located at a position reserved on the inner peripheral side of the burner cap 4 than the surface of each partitioning part 401 facing the outer peripheral side of the burner cap 4. Therefore, a space 421 that opens to the outer peripheral side of the burner cap 4 is formed on the outer peripheral side of the burner cap 4 of the partition portion 422 in each flame hole groove 42. The end portions on the outer peripheral side of the burner cap 4 of the groove portions 420 on both sides of each partition portion 422 are in communication with each other through a space 421.

  As shown in FIG. 3, each partition portion 401 and each partition portion 422 are placed on the upper end surface of the outer cylinder portion 910. Accordingly, the annular groove 403 of the burner cap 4 is disposed at a position facing the outlet 301 of the air passage 30 formed on the upper surface of the burner body 3 as shown in FIGS. 5 and 6, and communicates with the air passage 30. doing.

  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 910 which is the upper surface of the opposed burner body 3. That is, in the gas burner 1, many flame holes 10 extending from the inner peripheral side of the burner cap 4 to the outer peripheral side are formed in the circumferential direction of the burner cap 4. A flame hole outlet 100, which is an outlet of each flame hole 10, opens to the outer peripheral side of the burner cap 4. The ventilation passage 30 and each flame hole 10 constitute a gas passage 15 that supplies a mixed gas to each flame hole outlet 100.

  As shown in FIG. 2, the nozzle 5 and the damper 6 are provided at the inlet 300 of the air passage 30. The nozzle 5 and the damper 6 are attached to the burner base 8. The nozzle 5 may be attached to the furnace instead of the burner body 3. The damper 6 can be omitted.

  The nozzle 5 is connected to a supply path 23 provided in the furnace 2 and receives supply of fuel gas from the supply path 23. The amount of fuel gas supplied from the 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 supply path 23, and this instrument plug is operated by an operation part (for example, a knob on the operation panel) provided in the front part of the furnace 2. 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 inlet 300 of the air passage 30. The fuel gas supplied to the nozzle 5 is ejected from the ejection port 50 into the ventilation path 30. Further, as the fuel gas is ejected from the nozzle 5, the air around the nozzle 5 is sucked, and this air is supplied to the air passage 30 together with the fuel gas ejected from the nozzle 5 as primary air. .

  The damper 6 is disposed, for example, at the inlet 300 of the air passage 30. The opening area of the damper 6 is a predetermined opening area corresponding to the gas fuel to be used, but an opening area of the inlet 300 may be changed according to the operation of the operation unit.

  The fuel gas and the primary air supplied from the jet outlet 50 of the nozzle 5 to the ventilation path 30 via the damper 6 are mixed in the process toward the gap 32 in the mixing pipe 35. This mixed gas is supplied to each flame hole 10 through a gap 32 between the outer cylinder portion 910 and the inner cylinder portion 811. That is, the mixed gas in the air passage 30 is supplied to the annular groove 403 of the upper burner cap 4 shown in FIGS. 5 and 6, and thereafter each flame positioned on the outer peripheral side of the burner cap 4 with respect to the annular groove 403. Supplied to the hole groove 42. 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 discharged from the flame hole outlet 100.

  As shown in FIG. 4, in the upper end surface of the outer cylinder portion 910 of the burner body 3, the portion facing the outer peripheral side end portion 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 portion 910.

  On the upper end surface of the outer cylinder portion 910, the portion on the inner peripheral side with respect to the paragraph surface 900 is a mounting portion 901 on which the inner peripheral side of each partition portion 401 of the burner cap 4 and each partition portion 422 are placed. .

  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.

  Each flame-holding hole 12 allows the ends on the outer peripheral side of the burner cap 4 of the main flame hole 10 on both sides thereof to communicate with each other. As shown in FIG. 7, 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. Is formed. The inner peripheral side of the burner cap 4 of the second recess 404 communicates with the first recess 402 through a void 404a.

  Part of the mixed gas supplied from the air 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 this order to each flame holding hole 12. It comes to be supplied.

  One partition portion 401 of the burner cap 4 is a partition portion 401a through which a mixed gas for ignition passes. 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 air passage 30 of the burner body 3 to the annular groove 403 of the burner cap 4 sequentially passes from the first recess 402 to the void 404a, the second recess 404, and the void 404b. , 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, the base 81 of the burner body 3 is provided with an ignition plug 14 that generates an ignition spark with the spark target 13.

  In order to burn the gas burner 1, an ignition spark is generated by the spark plug 14 in a state in which 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 partitioning portion 401a shown in FIG. 7 via the void 404b is ignited by the ignition spark, and the portion corresponding to the void 404b An ignition flame is formed on the surface. This ignition flame is successively 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. Thereby, a flame is formed in each flame hole exit 100 of gas burner 1, and each flame holding hole 12 exit.

  When the heating power of the gas burner 1 is suddenly 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 is: It can increase momentarily due to the inertia of the primary air. 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, resulting in poor combustion. Even when the damper 6 is provided as in this example, 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. There is.

  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 serves as a bypass for the ventilation passage 30, and the recess formed on the upper surface of the base portion 81 of the burner base 8 and the recess formed on the lower surface of the main body portion 91 of the burner body 9 are aligned. It is formed by that.

  As shown in FIG. 8, the sub-chamber 31 is located outside the gap 32 having a circular cross section that forms the downstream portion of the air passage 30, and is formed along the gap 32.

  The subchamber 31 includes an introduction port 310, an outlet port 311, and a storage unit 312 that connects the inlet port 310 and the outlet port 311.

  The storage part 312 is comprised by the space part long in the circumferential direction of the outer cylinder part 910 by planar view. The introduction port 310 is formed on the inner surface of the outer cylinder portion 910 and allows one end portion in the longitudinal direction of the storage portion 312 to communicate with the lower portion of the gap 32 positioned inside thereof.

  The outlet 311 is formed on the upper end surface of the outer cylinder 910 and is separated from the inlet 310 in the circumferential direction of the outer cylinder 910. As shown in FIG. 6, the outlet 311 opens upward at a position facing one flame hole groove 42 of the flame hole grooves 42 of the burner cap 4.

  Hereinafter, in order to distinguish the flame hole groove 42 facing the outlet port 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 grooves 42, the flame hole groove 42 a Describe. Moreover, the main flame hole 10 comprised using the groove | channel 42a for flame holes is described as the main flame hole 10a, and the flame hole exit 100 of the main flame hole 10a is described as the flame hole outlet 100a.

  As shown in FIG. 4, a part of the outer cylinder portion 910 of the burner body 3 in the circumferential direction is a protruding portion 902 that protrudes to the inner peripheral side with respect to the other portion. As a result, the annular outlet 301 in plan view of the air passage 30 has a partial width in the circumferential direction (interval between the outer tube portion 910 and the inner tube portion 811) smaller than the width of the other portion.

  The outlet 311 of the sub-chamber 31 is formed on the upper end surface of the projecting portion 902 of the outer cylinder portion 910, and is located on the inner side of the outermost peripheral edge of the annular outlet 301 of the vent passage 30 in plan view. . The outlet 311 is formed in a substantially rectangular shape that is long along the outlet 301 in plan view.

  The outlet 311 is located on the inner peripheral side of the burner cap 4 with respect to the partition portion 422 of the flame hole groove 42a. The end of the storage portion 312 opposite to the introduction port 310 in the longitudinal direction communicates with the flame hole groove 42 a via the outlet port 311.

  As shown in FIG. 6, when the location facing the outlet 301 in the flame hole groove 42 a is the first location 423, the outlet 311 is located in the flame hole groove 42 a of the burner cap 4 more than the first location 423. It faces the location located on the outer periphery. Hereinafter, the part facing the outlet 311 in the flame hole groove 42 a is referred to as a second part 424.

  During combustion of the gas burner 1, a part of the mixed gas supplied to the air passage 30 is supplied from the inlet 310 to the reservoir 312, and this mixed gas passes from the outlet 311 to the second location 424 of the flame hole groove 42 a. To be supplied. That is, at the time of 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 15 flows in the sub chamber 31 and is supplied to the flame hole outlet 100a.

  The channel area of the inlet 310 is preferably smaller than the channel area of the outlet 311. This is because the mixed gas in the sub-chamber 31 can be stably supplied from the outlet 311 to the flame hole groove 42a. In addition, 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 suddenly changed from a large fire to a small fire during the combustion of the gas burner 1, the mixed gas stored in the storage portion 312 of the sub-chamber 31 during the combustion in the large fire state is The mixed gas supplied from the air passage 30 to the inlet 310 is pushed out from the outlet 311 to the second portion 424 of the flame hole groove 42a.

  On the other hand, the mixed gas directly supplied from the air passage 30 to the first portion 423 of the flame hole groove 42a through the outlet 301 is directed toward the flame hole outlet 100a along the flame hole groove 42a. The mixed gas blown upward from the outlet 311 is joined to the mixed gas at the second location 424, and then discharged from the flame hole outlet 100a to the outer peripheral side of the burner cap 4. Thereby, when the heating power is suddenly changed from a large fire to a small fire, the ratio of the primary air of the mixed gas blown out from the flame hole outlet 100a is hardly increased. 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 satisfactorily.

  Between the 1st location 423 and the 2nd location 424 in the groove 42a for flame holes, the flow which goes to the 1st location 423 side of the mixed gas supplied from the sub chamber 31 to the 2nd location 424 of the groove 42a for flame holes is carried out. A blocking weir portion 33 is provided. The weir portion 33 is downstream from the first location 423 and upstream from the second location 424 when the flow of the mixed gas directly supplied from the outlet 301 of the air passage 30 to the flame hole groove 42a is used as a reference. Is located.

  As shown in FIG. 7, the weir portion 33 protrudes downward from the lower surface of the annular portion 40 constituting the upper surface of the flame hole groove 42 a of the burner cap 4, and the length direction of the flame hole groove 42 a (burner It is formed in a wall shape substantially perpendicular to the radial direction of the cap 4.

  The weir portion 33 is formed with a gap 330 penetrating in the length direction of the flame hole groove 42a. As shown in FIG. 6, the first portion 423 and the second portion 424 of the flame hole groove 42 a communicate with each other through a gap 330. The mixed gas supplied from the outlet 301 of the air passage 30 to the first portion 423 of the flame hole groove 42 a is supplied to the flame hole outlet 100 a side through the gap 330.

  By providing the weir portion 33 in the flame hole groove 42a, the mixed gas supplied from the outlet port 311 to the second location 424 of the flame hole groove 42a is less likely to flow toward the first location 423. For this reason, the mixed gas in the sub-chamber 31 is easily supplied to the flame hole outlet 100a, and it is possible to make it more difficult to cause a combustion failure when the heating power is changed from a large fire to a small fire.

  The weir portion 33 does not have to be provided with the gap 330. That is, in this case, the mixed gas directly supplied from the outlet 301 of the air passage 30 of the burner body 3 to the annular groove 403 of the burner cap 4 is not supplied to the flame hole outlet 100a.

  As shown in FIG. 7, 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. . An end portion of each guide wall 44 on the inner peripheral side of the burner cap 4 is connected to a corresponding side end portion of the dam portion 33. Both guide walls 44 partition the first portion 423 of the flame hole groove 42a and the first recess 402 formed in the partition portion 401 located on both sides of the flame hole groove 42a. 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.

  As shown in FIG. 1, the storage portion 312 of the sub-chamber 31 is provided with a resistance portion 313. The resistance portion 313 is located at an end portion (downstream portion) on the outlet port 311 side in the longitudinal direction of the storage portion 312. In addition, the resistance portion 313 is located outside the outlet port 311 in the radial direction of the outer cylinder portion 910.

  The resistance portion 313 is formed in a plate shape along the flow direction of the mixed gas flowing from the inlet port 310 toward the outlet port 311 (longitudinal direction of the storage portion 312), and the flow direction of the mixed gas flowing through the storage portion 312 It is almost parallel. The resistance portion 313 is erected on the bottom surface of the storage portion 312 configured by the upper surface of the base portion 81 of the burner base 8 and is formed integrally with the base portion 81.

  The upper end surface of the resistance portion 313 is horizontal, and is disposed in the middle in the vertical direction of the storage portion 312 and below the outlet 311. The resistance portion 313 exists only in the lower portion of the end portion on the outlet port 311 side in the longitudinal direction of the storage portion 312 and does not exist in the upper portion of the end portion on the outlet port 311 side in the longitudinal direction of the storage portion 312. That is, the upper portion of the end portion on the side of the outlet 311 in the longitudinal direction of the storage portion 312 is a space 317 where the resistance portion 313 does not exist and the flow resistance is smaller than the portion where the resistance portion 313 is provided.

  During combustion of the gas burner 1, the mixed gas that has passed through the vicinity of the resistance portion 313 in the storage portion 312 is supplied to the flame hole groove 42 a from the outlet port 311 after passing through the space 317. That is, the space 317 is located at the downstream end of the storage portion 312 and is located downstream of the resistance portion 313 in the storage portion 312.

  Both surfaces of the plate-like resistance portion 313 become resistance to the flow of the mixed gas flowing through the storage portion 312 when the gas burner 1 is combusted. That is, a resistance force (viscous frictional force) is generated between the gas mixture flowing in the vicinity of the resistance portion 313 of the storage portion 312 and the plate surface of the resistance portion 313 during combustion of the gas burner 1.

  FIG. 9A is a schematic diagram illustrating the flow of the mixed gas in the storage unit 312 of the present embodiment in which the resistance unit 313 is provided, and FIG. 9B is a reference example in which the resistance unit 313 is not provided. It is a schematic diagram which shows the flow of the mixed gas in the storage part 312. In FIG. 9A, a portion indicated by S1 is a portion where the flow of the mixed gas is easily suppressed by the resistance portion 313, and a portion indicated by S2 is a portion where the flow of the mixed gas is difficult to be suppressed. Moreover, the part shown by S3 in FIG.9 (b) is a part for which the flow of mixed gas is hard to be suppressed.

  As is clear from FIG. 9, in the storage unit 312 of this embodiment, the flow of the mixed gas is suppressed in the vicinity of the resistance unit 313 as compared to the case where the resistance unit 313 is not provided. For this reason, the mixed gas in the storage unit 312 tends to flow toward the space 317 as if the flow path area of the storage unit 312 is small. This tendency becomes more prominent as the flow rate of the mixed gas flowing through the storage unit 312 increases. Therefore, when the heating power of the gas burner 1 is suddenly changed from a small fire to a large fire, the mixed gas in the storage unit 312 with a small amount of primary air becomes difficult to be supplied to the flame hole outlet 100a leading to the storage unit 312. It is suppressed that the flame formed in the exit 100a becomes larger than the flame formed in the other flame hole exit 100. FIG.

  Further, the resistance portion 313 is plate-shaped and hardly causes a decrease in the volume of the sub chamber 31. For this reason, when the heating power of the gas burner 1 is changed from a large fire to a small fire, a sub-chamber 31 that suppresses the occurrence of poor combustion by supplying a mixed gas having a high primary air mixing ratio to the flame hole outlet 100a. It is possible to make it difficult to impair the original effect.

  The resistance portion 313 is formed in a plate shape along the flow direction of the mixed gas flowing from the inlet 310 toward the outlet 311. For this reason, the flow of the mixed gas in the storage unit 312 is not easily inhibited by the resistance unit 313. In particular, when the heating power of the gas burner 1 is changed from a large fire to a small fire, since the flow rate of the mixed gas in the storage unit 312 is reduced, an increase in passage resistance due to the resistance unit 313 can be suppressed. Therefore, the original effect of the sub-chamber 31 can be further prevented from being impaired.

  In addition, the resistance unit 313 can be provided with a simple configuration that is erected on the bottom surface of the storage unit 312. In the present embodiment, the resistance portion 313 is provided on the bottom surface of the storage portion 312. However, the resistance portion 313 may protrude from the inner surface (side surface or top surface) other than the bottom surface of the storage portion 312.

  In addition, a space 317 that is located on the downstream side of the resistance portion 313 and does not have the resistance portion 313 is formed at the downstream end of the storage portion 312. For this reason, immediately after the heating power of the gas burner 1 is changed from a large fire to a small fire, the mixed gas stored in the space 317 is quickly supplied from the outlet 311 to the flame hole groove 42a. Therefore, the original effect of the sub-chamber 31 can be further prevented from being impaired.

  Further, the bottom surface 314 provided with the resistance portion 313 in the storage portion 312 of the present embodiment is positioned one step higher than the bottom surface 315 on the upstream side via the inclined surface 316 as shown in FIG. . The inclined surface 316 is inclined so as to be positioned higher on the downstream side in the storage portion 312. The flow of the mixed gas flowing along the bottom surface of the storage unit 312 is changed in an obliquely upward direction by the inclined surface 316 immediately before the resistance unit 313. For this reason, the mixed gas in the storage part 312 is easy to flow smoothly to the outlet 311 side above the storage part 312. Further, the side end surface of the resistance portion 313 on the introduction port 310 side is inclined so as to be positioned downward toward the introduction port 310 side, and the flow of the mixed gas changed to the direction including the upper component by the inclined surface 316. It does not become excessive resistance against.

  The design of the gas burner 1 of the present embodiment can be changed without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Gas burner 10 Flame hole 10a Flame hole 30 Ventilation path 31 Subchamber 310 Inlet 311 Outlet 312 Reservoir 313 Resistor 317 Space

Claims (3)

A gas burner that is supplied with a fuel gas ejected from a nozzle and primary air sucked along with the ejection of the fuel gas, and supplies a mixed gas obtained by mixing the fuel gas and the primary air to a plurality of flame holes. Te, and the communicating the mixed gas vent passage for supplying to said burner ports in the flame hole, and a sub-chamber, said sub-chamber, an inlet communicating with the air passage, guide communicating with the fire hole A bypass section for connecting the outlet, the inlet and the outlet, and a reservoir for supplying a part of the mixed gas supplied to the ventilation path through the inlet; A gas burner, characterized in that a plate-like resistance portion serving as a path and providing resistance to the flow of the mixed gas flowing from the inlet to the outlet is provided in the reservoir.   2. The gas according to claim 1, wherein the resistance portion protrudes from an inner surface of the storage portion and is formed in a plate shape along a flow direction of a mixed gas flowing from the introduction port toward the discharge port. burner.   The gas burner according to claim 1 or 2, wherein a space where the resistance portion does not exist is formed at a downstream end portion of the storage portion, which is located downstream of the resistance portion.

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