JP2011064361A - Burner and gas baking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a burner reducing dimension, weight and cost and a gas baking device including the burner. <P>SOLUTION: The burner 1 includes a combustion part 2, a conduit part 3, a secondary air introduction outer piping part 4 and a connection part 5. The combustion part 2 includes: a mixed gas jetting part 2a jetting mixed gas of fuel and primary air; a secondary air jetting part 2b jetting secondary air; a mixed gas supply part 2c supplying the mixed gas to the mixed gas jetting part 2a; and a secondary air supply part 2d supplying secondary air to the secondary air jetting part 2b. The conduit part 3 introduces the mixed gas to the mixed gas supply part 2c. The secondary air introduction outer piping part 4 is detachably provided in the combustion part 2, and introduces the secondary air to the secondary air supply part 2d. The conduit part 3 includes an upstream conduit part 31 and a downstream conduit part 32, and the connection part 5 interconnects the upstream conduit part 31 and the downstream conduit part 32. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a burner used in a baking process or baking process for bread, confectionery, etc., and a gas baking apparatus including a burner.

  Conventionally, with respect to a gas baking apparatus mainly used in a baking process included in a manufacturing process for bread, confectionery, etc., one or more burners are placed on the upper side with respect to the transfer surface in which the object to be baked in the combustion chamber is transferred in the transfer direction. Are installed at positions separated by a predetermined distance and at positions separated by a predetermined distance on the lower side. The burner injects the mixed gas, and the discharged mixed gas is ignited by the ignitor together with the separately injected secondary air to generate a flame, and the object to be fired is baked by the heat generated by the flame or the radiant heat. Is done.

  As such a gas firing device, for example, a device described in Patent Document 1 has been proposed. In the gas baking apparatus described in Patent Document 1, one or more burners are extended in a direction perpendicular and horizontal to the direction in which the object to be fired is conveyed.

  This burner includes a combustion part and a conduit part that are continuous in the extending direction. The combustion section includes a mixed gas ejection section that ejects a mixed gas in which fuel and primary air are mixed, a secondary air ejection section that ejects secondary air, and a mixed gas ejected into the mixed gas ejection section. The unit is provided with a supply unit for supplying secondary air independently. Further, the conduit part introduces the mixed gas and the secondary air into the supply part of the combustion part independently of each other.

  In the supply part and the conduit part of the combustion part of the burner described in Patent Document 1, the insides of the respective pipes constituting the supply part and the conduit part are defined in two parts by the inner pipe. Each of the defined one and other portions has a function of independently supplying or introducing a mixed gas and secondary air. That is, the supply unit and the conduit unit have a common configuration. In the combustion part, a part of the inner pipe constitutes a slit constituting a mixed gas jet part and a secondary air jet part.

JP 2004-286362 A

  However, in the above-described prior art, the combustion section and the conduit section have a common configuration except for the mixed gas ejection section and the secondary air ejection section, and a relatively complicated installation of the inner pipe inside the piping. Since the configuration is also adopted in the conduit portion, the following problems arise.

  First, in order to install the inner pipe inside the pipe, it is necessary to fix the inner pipe to the inside of the pipe with the inner pipe bracket with a relatively large nominal diameter and outer diameter of the pipe. This leads to an increase in size and weight. Moreover, since a relatively complicated manufacturing process is required to install the inner pipe inside the pipe, this also increases the cost.

  However, as described in Patent Document 1, the inner pipe is suitable for constituting a part of the slit constituting the mixed gas ejection part and the secondary air ejection part in the combustion part, The conduit portion for introducing the mixed gas and the secondary air independently is not necessarily suitable. For this reason, in the structure of the prior art which made the structure of the conduit part conform to the structure of the combustion part, in the conduit part where the inner pipe is not essential, an unnecessary increase in cost and increase in size and weight are caused.

  Further, in the conventional gas baking apparatus as described above, in the process of installing the gas baking apparatus and the burner in the factory, or in the process of replacing or repairing the burner, a burner having a relatively long extension direction length is used. When inserting and installing in the gas firing device, work including rotation, movement, and position adjustment of the burner is required, and the space required for these work cannot be secured sufficiently, when installing the burner, There may be insufficient work space. Assuming such a case, the burner needs to be configured to be able to be divided and connected at an appropriate location in the extending direction.

  However, the following problems arise when installing a connecting portion that has an inner pipe and that can be connected by dividing a pipe defined in one and the other portion into an upstream side and a downstream side. In other words, at the division and connection locations, the connection portion is connected between the upstream and downstream pipes, and the portion for supplying or introducing the mixed gas and the portion for supplying or introducing the secondary air are independently connected in an airtight manner. It is necessary to have a possible structure. For this reason, the structure of the connection part used as a division | segmentation and a connection location is complicated, and this also causes the increase in cost.

  An object of this invention is to provide the burner and gas baking apparatus which can implement | achieve reduction of a dimension, weight, and cost in view of the said problem.

In order to solve the above problems, the burner according to the present invention is:
Including a combustion section, a conduit section, a secondary air introduction external piping section and a connection section,
The combustion section includes a mixed gas ejection section that ejects a mixed gas in which fuel and primary air are mixed, a secondary air ejection section that ejects secondary air, and a mixture that supplies the mixed gas to the mixed gas ejection section. A gas supply unit, and a secondary air supply unit that supplies the secondary air to the secondary air ejection unit,
The conduit section introduces the mixed gas into the mixed gas supply section;
The secondary air introduction external piping part is detachably provided in the combustion part, and introduces the secondary air into the secondary air supply part,
The conduit portion includes an upstream conduit portion and a downstream conduit portion;
The connecting portion connects the upstream conduit portion and the downstream conduit portion.

  Here, the secondary air is separately blown from the secondary air separately from the primary air previously contained in the mixed gas for the purpose of completely burning the mixed gas, that is, to promote complete combustion. It is ejected from the part. Further, the secondary air introduction external piping part is constituted by a pipe separate from the conduit part and the combustion part.

  Further, the connecting portion is disposed between the upstream conduit portion and the downstream conduit portion in the extending direction of the upstream conduit portion and the downstream conduit portion, and is disposed between the upstream conduit portion and the upstream conduit portion. The downstream conduit portion is hermetically connected, and can be configured to be detachable from the upstream conduit portion and the downstream conduit portion, for example, by a socket defined by JIS standards.

  Further, the upstream side conduit part and the downstream side conduit part are separate pipes, and are integrated by the connection by the connection part, for example, in an assembly process, a repair process, etc. to constitute the conduit part. is there.

In the burner,
It is preferable to include a joining part that joins the combustion part and the downstream conduit part.

Furthermore, in the burner,
It is preferable that the outer diameter of the pipe constituting the upstream conduit portion be smaller than the outer diameter of the pipe constituting the combustion portion.

Moreover, in order to solve the above-described problems, a gas baking apparatus according to the present invention includes
Including the burner,
A mixed gas injection part for injecting the mixed gas into the upstream conduit part; a secondary air injection part for injecting the secondary air into the secondary air external pipe; and a placement part for placing the object to be fired. Including,
It is characterized by that.

  According to the burner and the gas baking apparatus including the burner of the present invention, first, the function to be shared by the conduit portion can be only the function of introducing the mixed gas into the mixed gas supply portion. Thereby, the said conduit | pipe part is comprised only by normal piping, and in the said conduit | pipe part, the necessity for providing the inner pipe and defining the inside of piping which comprises the said conduit | pipe part can be eliminated, for example. Thereby, the structure of the said conduit | pipe part can be simplified and the manufacturing cost of the gas baking apparatus containing the said burner and the said burner can be reduced.

  Furthermore, since there is no need to provide an inner pipe in the conduit portion, the number of parts of the conduit portion is reduced, and the outer diameter of the pipe constituting the conduit portion is also reduced compared to the pipe constituting the combustion portion. The outer diameter of the burner can be reduced, and the size and weight of the gas firing device including the burner and the burner can be reduced.

  In addition, since the pipe constituting the conduit portion can use a lighter member that is cheaper and thinner than the pipe constituting the combustion portion, the burner and the gas firing device including the burner can be used. Raw material costs, that is, costs can be reduced, and the total weight of the burner can be reduced.

  Furthermore, since the secondary air introduction external piping part can also be constituted by only ordinary piping, the manufacturing cost can be reduced.

  In addition, since the upstream conduit portion and the downstream conduit portion constituting the conduit portion can be connected by the connecting portion, the burner and the gas including the burner in a factory such as bread or confectionery, for example. In the assembling process for installing the baking apparatus or the repairing process for replacing or repairing the burner, the upstream conduit part and the downstream conduit part can be separated at the connection part.

  Thereby, compared with the length of the extending direction after the assembly of the burner, the upstream conduit portion that constitutes the burner before assembly, and the portion that includes the downstream conduit portion that also constitutes the burner. Both can be shortened. This makes it easier to perform operations including rotation, movement, position adjustment, etc. of the part including the upstream-side conduit part or the downstream-side conduit part when installing in a factory, and the work space is narrow. In addition, the assembly work and the installation work can be made easier.

  ADVANTAGE OF THE INVENTION According to this invention, the burner and gas baking apparatus which can implement | achieve the reduction of a dimension and weight and reduction of cost can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing an embodiment of a burner and a gas baking apparatus according to the present invention when viewed from a direction perpendicular to the extending direction of the burner and parallel to a horizontal plane and from below. It is a schematic cross section which shows the structure in AA or BB cross section perpendicular | vertical to the extending direction in one Embodiment shown in FIG. 1 of the burner which concerns on this invention, and a gas baking apparatus. FIG. 3 is a schematic view of the burner and gas baking apparatus according to the present invention as viewed from the ejection direction in the embodiment shown in FIG. 2. It is a schematic diagram which shows the form of the socket which one Embodiment of the burner which concerns on this invention, and a gas baking apparatus contains. It is a schematic diagram which shows the whole form of one Embodiment of the burner which concerns on this invention, and a gas baking apparatus.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the burner 1 of this embodiment includes a combustion part 2, a conduit part 3, a secondary air introduction external piping part 4, a socket 5, and a plate 6. 1-3, V indicates the jet direction of the mixed gas, S indicates the extending direction of the burner 1, and UP indicates the upward direction. That is, FIG. 1A shows a view of the burner 1 viewed from the ejection direction V, and FIG. 1B shows a view of the burner 1 viewed from below.

  As shown in FIG. 1, the combustion unit 2 extends in the extending direction S with a length of L1. As shown in FIGS. 1 and 2, the combustion section 2 includes a mixed gas ejection section 2 a that ejects a mixed gas in which fuel and primary air are mixed in the ejection direction V, and a secondary gas that ejects secondary air in the ejection direction V. The secondary air ejection part 2b is provided.

  Further, as shown in FIG. 2, the combustion unit 2 includes a mixed gas supply unit 2c that supplies a mixed gas to the mixed gas injection unit 2a and a secondary air supply unit that supplies secondary air to the secondary air injection unit 2b. 2d. In addition, as shown in FIG. 1, the combustion unit 2 includes a secondary air connection portion 2 e to which the secondary air introduction external piping portion 4 is connected via a piping joint provided on the extending direction S side. The secondary air connection part 2e connects the secondary air introduction external piping part 4 and the secondary air supply part 2d in an airtight manner.

  As shown in FIG. 2, the combustion unit 2 includes a pipe 20 having a nominal diameter of 50 A, and the pipe 20 has a portion directed in the ejection direction V cut out in the entire axial direction, that is, the extending direction S. Thus, the notched portion constitutes an insertion slit portion 20a extending in the extending direction S. An inner pipe 21 is provided inside the pipe 20.

  As shown in FIG. 2, the inner pipe 21 is configured by bending a single metal plate. The inner pipe 21 defines a mixed gas supply part 2c on the inner side, a square columnar part 21a that defines a secondary air supply part 2d between the outer side and the inner peripheral surface of the pipe 20, and a rectangular columnar part The slit part 21b which consists of a pair of flat plate which comprises the mixed gas ejection part 2a extended upwards from the upper end of 21a is included.

  The outer surface on the opposite side of the slit portion 21b of the square columnar portion 21a of the inner pipe 21 has an inner pipe bracket 22 formed by bending a single metal plate as shown in FIG. 2 into a V shape. 2, the pipe 20 is brought into contact with two places in the vertical direction on the inner peripheral surface in FIG. 2 and a total of three places opposite to the ejection direction V. The inner pipe bracket 22 is intermittently and partially disposed in the extending direction S as shown in FIG. Therefore, in FIG. 2, the inside of the pipe 20 is not defined by the inner pipe bracket 22.

  Further, on the most upstream side of the secondary air supply part 2d defined between the outer side of the square columnar part 21a of the inner pipe 21 and the inner peripheral surface of the pipe 20, the secondary air supply part 2d to the conduit part 3 are provided. In order to prevent both the secondary air from being mixed in and the mixed gas from the conduit portion 3 to the secondary air supply portion 2d, the inside of the conduit portion 3 is appropriately closed by an appropriate closing means. Is hermetically closed and defined. This closing means may be constituted by, for example, the plate 6 or may be appropriately constituted by other members.

  Further, the slit portion 21b is inserted while being unevenly distributed to the left of the inserted slit portion 20a in FIG. 2 so that the outer surface of the left flat plate in FIG. 2 contacts the inserted slit portion 20a. 2, the gap between the flat plate on the right side, that is, the upper side, and the insertion slit portion 20a constitutes a secondary air ejection portion 2b that ejects secondary air.

  That is, the lower gap between the left side of FIG. 2, that is, the lower flat plate and the inserted slit 20 a in FIG. 2 is set to zero, and the upper gap is set to be larger than the lower gap. The air ejection part 2b is provided on the right side in FIG. 2, that is, only on the upper UP side with respect to the mixed gas ejection part 2a.

  In the gap between the pair of flat plates of the slit portion 21b of the inner pipe 21 shown in FIG. 2, a mixed gas ribbon 23 for rectifying the mixed gas is installed, and on the outer surface of the flat plate on the right side of the slit portion 21b in FIG. A secondary air ribbon 24 for rectifying the secondary air is installed.

  In addition, the detailed form of the mixed gas ribbon 23 and the secondary air ribbon 24 overlaps the flat plate which makes the wave front shape as shown in FIG. 3 one or more layers. Here, it is assumed that the amplitude of the wavefront shape of the mixed gas ribbon 23 is larger than the amplitude of the wavefront shape of the secondary air ribbon 24, and the number of laminations of the mixed gas ribbon 23 is also greater than the number of laminations of the secondary air ribbon 24. Is also big.

  Further, in the slit portion 21b of the inner pipe 21, a ribbon stop pin insertion hole 21c through which a ribbon stop pin 25 as a ribbon stop means shown in FIG. 2 is inserted is directed in the left-right direction, that is, the vertical direction in FIG. It has been drilled. Further, the mixed gas ribbon 23 is provided with a ribbon fixing pin through hole 23a at a position corresponding to the ribbon fixing pin insertion hole 21c, and the secondary air ribbon 24 is also positioned at a position corresponding to the ribbon fixing pin insertion hole 21c. Ribbon retaining pin through hole 24a is formed.

  After the mixed gas ribbon 23 is inserted into the slit portion 21b and the ribbon retaining pin insertion hole 21c and the ribbon retaining pin through hole 23a are aligned, the ribbon retaining pin is inserted into the ribbon retaining pin insertion hole 21c and the ribbon retaining pin through hole 23a. 25 is inserted, and the right end of the ribbon retaining pin 25 is positioned so as to protrude rightward from the right side surface of the slit portion 21b in FIG. Thereafter, the outer peripheral surface of the ribbon retaining pin 25 and the inner peripheral surface of the ribbon retaining pin insertion hole 21c of the inner pipe 21 are airtightly joined by welding or the like, and the ribbon retaining pin insertion hole 21c is sealed or closed. .

  A ribbon retaining pin through hole 24a of the secondary air ribbon 24 is inserted into the right end portion of the ribbon retaining pin 25 that protrudes to the right from the right side surface of the slit portion 21b in FIG. 2 is moved from the right side to the left side in FIG. 2, and the left side surface of the secondary air ribbon 24 is brought into contact with the right side surface of the slit portion 21b for positioning.

  Thereafter, the top of the head is formed on the both ends in the axial direction of the ribbon fixing pin 25 by an appropriate means such as striking or pressing, or the top of the head is joined by welding or the like. Thereby, the mixed gas ribbon 23 and the secondary air ribbon 24 are restrained and fixed in the left-right direction in FIG.

  Here, the mixed gas ribbon 23 and the secondary air ribbon 24 are fixed only to the slit portion 21 b and the inner pipe 21 by the ribbon fixing pin 25, and not to the pipe 20.

  Further, a slit opening shown in FIG. 2 is provided in a portion adjacent to the quadrangular columnar portion 21a of the slit portion 21b and a portion located on the upper side in FIG. 2, that is, on the ejection direction V side from the center of the pipe 20 shown in FIG. A slit opening prevention pin insertion hole 21d and a slit opening prevention pin insertion hole 20b through which a slit opening prevention pin 26 as a stopper is inserted in the left-right direction are respectively formed on the same axis.

  The slit portion 21b of the inner pipe 21 that integrally includes the mixed gas ribbon 23 and the secondary air ribbon 24 by the above-described process is inserted into the insertion slit portion 20a of the pipe 20 from the extending direction S side. . After that, the slit opening stopper pin 26 is inserted in the slit opening pin insertion hole 20b and the slit opening prevention pin insertion hole 21d in the left-right direction in FIG. Are formed by appropriate means such as striking or pressing, or the crown is joined by welding or the like.

  As a result, the inner pipe 21 is fixed and fixed to the pipe 20 in the left-right direction, that is, the vertical direction in FIG. 2, and the slit opening pin 26 is restrained from the left and right sides by the pair of right and left heads in FIG. 2. Based on the force, the insertion slit portion 20a of the pipe 20 is prevented from opening in the left-right direction in FIG.

  The conduit part 3 and the combustion part 2 are coaxially arranged in this order in this order from the front side in the extending direction S in FIG. Similarly, the upstream side conduit part 31 and the downstream side conduit part 32 which comprise the conduit part 3 are also arrange | positioned coaxially in this order. The upstream side conduit portion 31 is constituted by, for example, a pipe having a nominal diameter of 40A, and the upstream side portion of the downstream side conduit portion 32 is also constituted by a pipe having a nominal diameter of 40A.

  On the outer peripheral surface of the downstream end portion of the upstream conduit portion 31 and the outer peripheral surface of the upstream end portion of the downstream conduit portion 32, there are female screw portions formed on the inner peripheral surface of the socket 5 as shown in FIG. A threaded male thread portion is formed. FIG. 4 is a schematic view showing the form of the socket 5 included in the burner 1 of the present embodiment. The nominal diameter D, the axial length L, and the inner diameter d2 of the socket 5 shown in FIG. 4 are determined by, for example, JIS standards.

  By screwing the female screw portion of the socket 5 into the male screw portion provided at the downstream end portion of the upstream conduit portion 31 and the upstream end portion of the downstream conduit portion 32 during the assembly process or the like, the upstream conduit The downstream end of the portion 31 and the upstream end of the downstream conduit portion 32 are detachably and airtightly connected. That is, the socket 5 constitutes a connection portion that connects the upstream conduit portion 31 and the downstream conduit portion. The upstream conduit portion 31 and the downstream conduit portion 32 are connected by the socket 5 to form the conduit portion 3, and the conduit portion 3 has a length of L2 as a whole in the extending direction S.

  Further, the downstream portion of the downstream conduit portion 31 includes a diameter-expanding portion that gradually increases in diameter toward the downstream side, that is, the extending direction S, and a large-diameter portion that has the same diameter as the pipe 20. The downstream end portion, that is, the large diameter portion of the downstream conduit portion 31 is welded in advance to the upstream end portion of the pipe 20 constituting the combustion section 2 via the annular plate 6 having the same cross-sectional shape as the pipe 20. Joined at the time of manufacture. That is, the plate 6 constitutes a joint part that joins the combustion part 2 and the downstream conduit part 32.

  An upstream end portion 31e of the upstream conduit portion 31 of the conduit portion 3 is fixed to the disc-like substrate 7 so as to penetrate from the left to the right in FIG. The upstream end 4e of the secondary air introduction external piping part 4 is in airtight communication with a secondary air injection part 8 provided on the substrate 7 via a pipe joint.

  An output port of the gas mixer 9 is airtightly connected to the upstream end 31e. One of the two input ports of the gas mixer 9 is air-tightly connected to an air pipe (not shown), and a blower (not shown) is connected to the upstream side of the air pipe. The other input port of the gas mixer 9 is fuel-tightly connected to the fuel pipe. The gas mixer 9 constitutes a mixed gas injection part that mixes primary air from the air pipe and fuel from the fuel pipe, outputs a mixed gas from the output port, and injects it into the upstream pipe part 31 of the conduit part 3. .

  An air pipe (not shown) is connected to the secondary air injection unit 8, and a blower (not shown) is connected to the upstream side of the air pipe. The air pipe (not shown) connected to the gas mixer 9 and the air pipe connected to the secondary air introduction external pipe section 4 may be the same system or different systems. Further, an igniter 10, that is, an ignition device, is installed on the substrate 7 in parallel with the conduit portion 3 and the secondary air introduction external piping portion 4.

  Next, the gas baking apparatus S1 including the burner 1 described above will be described with reference to the drawings. FIG. 5 is a schematic diagram showing the gas baking apparatus S1 of the present embodiment. The gas baking apparatus S1 includes one or more burners 1 as shown in FIG. 1, and includes a gas mixer 9 that constitutes a mixed gas injection unit that injects a mixed gas into the upstream conduit portion 31, and a secondary air introduction external piping unit 4 includes a secondary air injecting section 8 for injecting secondary air, and a belt 102 of a belt conveyor constituting a placing section for placing an object to be fired 101 as shown in FIG. The conveying direction of the belt 102 is a direction from left to right as shown in FIG. 5, and the burner 1 is arranged in parallel at equal intervals in the conveying direction at two upper and lower portions of the belt 102, and the ejection direction V of the burner 1 is The direction is the same as the transport direction.

  The gas baking apparatus S1 further includes a baking chamber 103 that defines air outside the gas baking apparatus S1 in the factory and air inside the gas baking apparatus S1. An object 101 to be fired before firing is conveyed into the firing chamber 103 from the entrance 104 of the firing chamber 103 by the belt 102 of the belt conveyor.

  Due to the flame generated when the mixed gas ejected from the mixed gas ejection part 2a of the burner 1 and the secondary air ejected from the secondary air ejection part 2b are ignited by the spark of the igniter 10. Due to the heat, the firing object 101 on the belt 102 is subjected to the preheating, firing, and coloring / drying processes in the combustion chamber 103.

  More specifically, it is preheated in the area A shown in FIG. 5 defined on the left side of the partition wall 105 and fired in the area B defined by the partition walls 105 and 106, and rightward from the partition wall 106. Colored and dried in area C defined by The object to be fired 101 after the above-described three steps is carried out is carried out by the belt 102 from the carry-out port 107 of the baking chamber 103. Air including exhaust gas generated after combustion of the mixed gas and secondary air after combustion in the combustion chamber 103 is appropriately discharged from the firing chamber 103 by the exhaust duct 108 and the exhaust fan 109.

  According to the burner 1 and the gas baking apparatus S1 including the burner 1 described above, the following operational effects can be obtained. First, the function shared by the conduit part 3 can be only the function of introducing the mixed gas into the mixed gas supply part 2c of the combustion part 2, and thereby the conduit part 3 can be configured by only ordinary piping. it can.

  That is, in the conduit portion 3, it is possible to eliminate the necessity of providing the inner pipe 21 as in the combustion portion 2 to define the inside of the pipe constituting the conduit portion 3. Further, since it is not necessary to provide the insertion slit portion 20a provided in the range of L1 in FIG. 1A of the combustion portion 2 in the conduit portion 3, in the pipe constituting the conduit portion 3, the slit opening prevention pin 26 and There is no need to provide the slit opening pin insertion hole 20b. By these things, the structure of the conduit | pipe part 3 can be simplified and the manufacturing cost of gas baking apparatus S1 containing the burner 1 and the burner 1 can be reduced.

  In addition, since it is not necessary to provide the inner pipe 21 in the conduit portion 3, the number of parts of the conduit portion 3 is reduced, and the outer diameter of the piping constituting the conduit portion 3 is also excluded except for the large diameter portion in the vicinity of the plate 6. The diameter of the gas firing device S1 including the burner 1 and the burner 1 can be reduced as compared with the pipe 20 constituting the combustion unit 2, and the range in which the outer diameter of the burner 1 is reduced as long as possible. It can be reduced as much as possible.

  Furthermore, since the pipe constituting the conduit section 3 can use a lighter material that is cheaper and thinner than the pipe 20 constituting the combustion section 2, the raw material cost of the burner 1 can be suppressed. The raw material cost of the entire gas baking apparatus S1 including the burner 1 can be suppressed. In addition, the total weight of the burner 1 and thus the total weight of the gas firing device S1 can be reduced. In addition, if the member of the piping 20 which comprises the combustion part 2 is made into STPG, for example, the piping which comprises the conduit | pipe part 3 can be made into SGP.

  Moreover, since the secondary air introduction external piping part 4 can also be comprised only by normal piping, manufacturing cost can be reduced.

  In addition, since the upstream conduit portion 31 and the downstream conduit portion 32 constituting the conduit portion 3 can be detachably connected by the connection portion, that is, the socket 5, the burner 1 and the gas baking apparatus S1 are applied, for example, pan In a factory such as confectionery or the like, the upstream conduit portion 31 and the downstream conduit portion 32 can be separated at the socket 5 in the assembly process and repair process in which the burner 1 and the gas baking apparatus S1 are installed.

  By enabling the burner 1 to be in a separated state in this way, compared to the length of the burner 1 in the extending direction after assembly, the upstream side conduit portion 31 constituting the burner 1 before assembly, Each of the downstream side conduit portion 32 and the portion including the combustion portion 2 constituting the burner 1 can be shortened. Thereby, in installation work in a narrow work space when installing the burner 1 in the factory, work including rotation, movement, and position adjustment for installation of the part including the upstream side conduit part 31 or the downstream side conduit part 32 is performed. The assembly work and the installation work can be made easier. That is, workability in a narrow place can be improved.

  In this assembling operation and installation operation, the secondary air introduction external piping section 4 is separated from the upstream piping joint by the downstream piping joint, and the upstream conduit section 31 is connected to the downstream by the socket 5. After the side conduit part 32 is connected, it can be connected to the secondary air injection part 8 and the secondary air connection part 2e by a pipe joint. Of course, either the upstream side or the downstream side of the secondary air introduction external piping part 4 is connected to the secondary air injection part 8 on the substrate 7 side or the secondary air connection part 2e on the combustion part 2 side via a pipe joint. It is good also as connecting in advance, after connecting the upstream conduit part 31 and the downstream conduit part 32 by the socket 5, and connecting the other by a pipe joint.

  By the way, when the ejection amount of the mixed gas is sufficiently large and the ejection energy is sufficiently large, the position where the flame starts to rise due to its own convection action or the entire air flow in the gas baking apparatus S1 is directed from the burner 1 to the ejection direction V. It can be a sufficiently distant place. However, if the amount of jet of mixed gas is reduced and the flame is reduced to low heat, if the amount of secondary air is also reduced, the convection action causes the flame to wrap around the upper side of the pipe 20. There is a risk of rolling up. In this way, when a phenomenon occurs in which the flame wraps around the upper side of the pipe 20, only the upper side of the pipe 20 is heated, and the lower side is not heated, causing the secondary air to be cooled in reverse, A large temperature difference occurs between the upper side and the lower side, heat distortion occurs in the pipe 20, thermal fatigue accumulates, and durability may be reduced.

  Then, like the burner 1 shown in the Example mentioned above, by providing the secondary air ejection part 2b only in one side of the upper side with respect to the mixed gas ejection part 2a, both upper and lower sides of the mixed gas ejection part 2a are provided. The secondary air ejection amount from the secondary air ejection part 2b on the upper side is made larger than that provided in the above.

  With such a configuration, even in the case of a low fire, since a large amount of secondary air can be ejected only from the upper side, the flame can be rolled up at a position away from the pipe 20, It is possible to prevent the flame from rolling up along the pipe 20. Further, since the secondary air is not ejected from the lower side, the temperature decrease on the lower side of the pipe 20 is suppressed. As a result, the temperature difference between the upper side and the lower side of the pipe 20 can be reduced, the occurrence of thermal distortion due to the temperature difference and the accumulation of thermal fatigue can be prevented, and the pipe 20 and thus the entire combustion section 2 can be prevented. Durability can be increased.

  Further, as shown in FIG. 1, the inner pipe bracket 22 is provided intermittently and partially in the extending direction S, and a gap between the inner pipe 21 and the inner peripheral surface of the pipe 20 is defined by the inner pipe bracket 22. Since the thickness is sufficiently larger than the thickness, a space located on the outer circumferential side of the inner pipe 21 in FIG. 2 on the side of the ejection direction V of the inner pipe bracket 22 and a space located on the side opposite to the ejection direction V of the inner pipe bracket 22. Can be regarded as the same space. In addition, since the gap between the inner pipe 21 and the inner peripheral surface of the pipe 20 is sufficiently large with respect to the thickness in the vertical direction of the secondary air ejection part 2b, the secondary air to the secondary air ejection part 2b The supply of air can be made smoother, and the ejection only upward can be made easier.

  In addition, a secondary air supply part and a mixed gas supply part are defined in piping, for example using the plate-shaped member containing a V-shaped part as shown in FIG.6 (b) of patent document 1 for an inner pipe. In some cases, in order to prevent both the secondary air from flowing into the mixed gas or the mixed gas from flowing into the secondary air due to the pressure difference between the secondary air and the mixed gas. The end of the V-shaped plate member opposite to the slit portion needs to be airtightly joined to the inner peripheral surface of the pipe.

  Here, in the technique shown in FIG. 6B of Patent Document 1, it is disclosed that the end of the inner pipe is fitted into the groove in the pipe. However, in this technique, sufficient airtightness is provided at the fitting position. Can not be secured. For this reason, it is conceivable that the end of the plate-like member including the V-shaped part is joined to the inner circumference of the pipe by airtightly along the extending direction by welding or the like. It is generally difficult to weld the end of the plate-like member. For example, the pipe is vertically divided into two, and the end of the plate-like member is joined to the divided surface of one of the two pipes by welding. Then, it becomes necessary to join the divided surface of the other pipe to the end of the plate-like member by welding.

  In this case, an inherent difference occurs in the vertical gap between the inserted slit portion of the pipe and the secondary air ejection portion due to distortion caused by welding, and there is a possibility that stable gas mixture and secondary air ejection may be hindered. According to the burner 1 of the present embodiment, the side opposite to the slit portion 21b of the inner pipe 21 does not need to be airtightly bonded to the inner peripheral surface of the pipe 20 over the entire extending direction S. It is also possible to make it unnecessary to divide the plate in the vertical direction and to weld the plate-like member between the divided pipes.

  At the same time, since welding is not required when installing the inner pipe 21 in the pipe 20, the inserted slit portion 20a, the mixed gas jetting portion 2a, and the secondary air jetting portion 2b in the horizontal direction in FIG. Since it is possible to avoid the thickness in the direction, that is, the gap, from being affected by welding distortion, more stable mixed gas and secondary air can be ejected, and combustion performance can be further improved.

  In addition, even if the secondary air ejection part 2b is provided only on the upper side of the mixed gas ejection part 2a, that is, even if the secondary air ejection part is not provided on both sides of the mixed gas ejection part, the use state including normal strong fire In general, there is no effect on the combustion state. However, when there is a strong demand for supplying a small amount of secondary air on the lower side of the flame, for example, because of the thickness of the mixed gas ejection part 2a in the vertical direction, that is, when the gap of the slit part 21b is relatively large. Alternatively, the secondary air ejection portion 2b may be provided on the lower side as appropriate, and the air volume of the upper secondary air ejection portion 2b may be set larger than the air volume of the lower secondary air ejection portion 2b.

  In this case, the ribbon fixing pin 25 is protruded from both the left and right side surfaces in FIG. 2 of the pair of left and right slit portions 21b, that is, both the upper and lower surfaces, and the lower side is thinner than the secondary air ribbon 24 on the upper side. The secondary air ribbon may be fixed to the left end portion in FIG.

  Further, since the ribbon stopper pin 25 is not shared with the slit opening stopper pin 26, the strength of preventing the opening stopper can be lowered to a strength necessary for stopping and fixing the mixed gas ribbon 23 and the secondary air ribbon 24. As described above, before the inner pipe 21 is attached to the pipe 20, the mixed gas ribbon 23 and the secondary air ribbon 24 can be attached to the inner pipe 21 only by the ribbon fixing pin 25.

  In this case, the ribbon outer peripheral surface of the ribbon retaining pin 25 is air-tightly joined to the inner peripheral surface of the ribbon retaining pin insertion hole 21c through which the ribbon retaining pin 25 of the inner pipe 21 is inserted, as described above. The stopper pin insertion hole 21c can be plugged.

  For this reason, the gap between the ribbon retaining pin 25 and the ribbon retaining pin insertion hole 21c can be eliminated, and the mixed gas from the mixed gas ejecting portion 2a to the secondary air supply portion 2d can be removed from the ribbon retaining pin insertion hole 21c and the ribbon retaining pin 25. Inflow through the gap can be prevented. Similarly, it is possible to prevent the secondary air from flowing from the secondary air supply unit 2d to the mixed gas ejection unit 2a through the gap between the ribbon retaining pin insertion hole 21c and the ribbon retaining pin 25. Therefore, the gas flow between the secondary air supply unit 2d and the mixed gas ejection unit 2a can be completely blocked, and the combustion performance of the burner 1 can be improved.

  In addition, since it is sufficient for the ribbon retaining pin 25 to have the strength to fix the mixed gas ribbon 23 and the secondary air ribbon 24 to the slit portion 21b, the strength in the axial direction can be reduced. The outer diameter can be reduced. Accordingly, the ratio of the ribbon stopper pin 25 to the projected area of the mixed gas ejection part 2a and the secondary air ejection part 2b when viewed from the ejection direction V in FIG. 3 can be reduced. For this reason, while being able to eject both mixed gas and secondary air more smoothly, it can prevent that the ribbon stop pin 25 inhibits propagation of a flame.

  Furthermore, the fixing to the mixed gas ribbon 23 and the secondary air ribbon 24 with respect to the inner pipe 21 by the ribbon fixing pin 25 and the opening prevention of the inserted slit portion 20a of the pipe 20 by the slit opening stopping pin 26 are performed in separate steps. By doing this, as described above, it is possible to appropriately select a processing method suitable for each.

  Further, since the ribbon stopper pin 25 as the ribbon stopper means and the slit stopper pin 26 as the slit stopper means are separated, the latter slit stopper pin 26 is piped with the inserted slit portion 20a interposed therebetween. 2 can be replaced with a flange having a U-shape when viewed in the extending direction S in FIG. The flanges are provided at appropriate intervals in the extending direction S in FIG.

  Thus, by using the slit opening preventing means as a flange located on the outer peripheral side of the pipe 20, it is possible to avoid the slit opening stopping pin 26 extending into the pipe 20 as shown in FIG. 2. Thereby, the flow of the secondary air in the secondary air supply part 2d can be made smooth, and also the flow of the mixed gas from the mixed gas supply part 2c to the mixed gas ejection part 2a can be made smooth. .

  Further, since the slit opening prevention pin 26 is not used as the slit opening prevention means, after the slit portion 21b is inserted into the insertion slit portion 20a of the pipe 20, the slit opening is performed at a position adjacent to the square columnar portion 21a of the inner pipe 21. It is possible to eliminate the necessity of drilling the stop pin insertion hole 21d. For this reason, the inflow of the mixed gas from the mixed gas supply unit 2c to the secondary air supply unit 2d and the inflow of the secondary air from the secondary air supply unit 2d to the mixed gas supply unit 2c can be completely blocked. . Thereby, the combustion performance of the burner 1 can be made still higher.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions are made to the above-described embodiments without departing from the scope of the present invention. be able to.

  The present invention relates to a burner and a gas baking apparatus including the burner, and can provide a burner and a gas baking apparatus capable of realizing reduction in size, weight, and cost. It is useful when applied to manufacturing processes and manufacturing plants.

DESCRIPTION OF SYMBOLS 1 Burner 2 Combustion part 2a Mixed gas ejection part 2b Secondary air ejection part 2c Mixed gas supply part 2d Secondary air supply part 2e Secondary air connection part 20 Piping 20a Insertion slit part 20b Slit opening pin insertion hole 21 Inner pipe 21a Square columnar part 21b Slit part 21c Ribbon stop pin insertion hole 21d Slit opening stop pin insertion hole 22 Inner pipe bracket 23 Mixed gas ribbon 23a Ribbon stop pin through hole 24 Secondary air ribbon 24a Ribbon stop pin through hole 25 Ribbon stop pin ( Ribbon stop means)
26 Slit opening stop pin (Slit opening stop means)
3 Conduit part 31 Upstream side conduit part 32 Downstream side conduit part 4 Secondary air introduction external piping part 5 Socket (connection part)
6 Plate (joint part)
7 Substrate 8 Secondary air injection part 9 Gas mixer (mixer: mixed gas injection part)
10 Igniter S1 gas firing device

Claims (4)

  A combustion section, a conduit section, a secondary air introduction external piping section, and a connection section, wherein the combustion section ejects a mixed gas in which fuel and primary air are mixed, and a secondary gas ejects secondary air. A secondary air ejection section; a mixed gas supply section that supplies the mixed gas to the mixed gas ejection section; and a secondary air supply section that supplies the secondary air to the secondary air ejection section. , Introducing the mixed gas into the mixed gas supply unit, the secondary air introduction external piping unit is detachably provided in the combustion unit, and introduces the secondary air into the secondary air supply unit, The conduit portion includes an upstream conduit portion and a downstream conduit portion, and the connecting portion connects the upstream conduit portion and the downstream conduit portion.   The burner according to claim 1, further comprising a joint portion that joins the combustion portion and the downstream conduit portion.   3. The burner according to claim 2, wherein an outer diameter of a pipe constituting the upstream side conduit section is made smaller than an outer diameter of a pipe constituting the combustion section.   A burner according to any one of claims 1 to 3, wherein a mixed gas injection portion for injecting the mixed gas into the upstream conduit portion, and the secondary air is injected into the secondary air introduction external piping portion A gas firing apparatus comprising: a secondary air injecting unit for carrying out; and a placing unit for placing an object to be fired.

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