JP2016023811A - Flame detection device and heat source machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame detection device which inhibits short circuits from being caused by dew condensation water, and to provide a heat source machine including the flame detection device.SOLUTION: A flame detection device includes: a case 101; an optical flame detection element 102; a lead wire 103; and a capacitor 104. The case 101 includes: an internal space IS; an opening part 101a communicating with the internal space IS; and a holding part 101b provided at the internal space IS. The optical flame detection element 102 is disposed in the internal space IS of the case 101 and exposed from the opening part 101a. The lead wire 103 is electrically connected with the optical flame detection element 102 and extends from the optical flame detection element 102 to the opposite side of the opening part 101a. The capacitor 104 is electrically connected with the optical flame detection element 102 and is held by the holding part 101b in the internal space IS so as to form a gap GP with the lead wire 103.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a flame detection device and a heat source machine.

  A so-called gun type burner may be used for the combustion device of the heat source machine. In this gun type burner, fuel such as kerosene is sprayed from the spray nozzle and combustion air is supplied from around the spray nozzle, thereby causing combustion by a diffusion flame. In order to detect the presence or absence of combustion of the gun type burner, a diffusion flame is detected by a flame detector. In the flame detection device, a flame is detected by, for example, a photodiode.

  An electronic component is disposed around the photodiode, and the photodiode and the electronic component are electrically connected via a harness. For this reason, the photodiode is affected by noise generated in the electronic component.

  As a technique for suppressing the influence of this noise, there is a technique of connecting a capacitor to a photodiode and removing the noise with this capacitor. For example, Japanese Patent Laid-Open No. 7-22642 (Patent Document 1) describes an opto-electric converter for the purpose of improving noise resistance. In this photoelectric converter, a capacitor is connected to the photodiode, and the photodiode and the capacitor are accommodated in one case.

Japanese Patent Laid-Open No. 7-22642

  When the photodiode and the capacitor are accommodated in one case as described in the above publication, the surface of the capacitor may come into contact with a lead wire electrically connected to the photodiode. In this case, when condensation occurs on the surface of the capacitor, a short circuit may occur between the lead wires electrically connected to the photodiode due to the condensed water adhering to the surface of the capacitor. As a result, the photodiode may malfunction.

  This invention is made | formed in view of said subject, The objective is to provide the flame detection apparatus which can suppress generation | occurrence | production of the short circuit by condensed water, and a heat source machine provided with the same.

  The flame detection device of the present invention includes a case, an optical flame detection element, a lead wire, and a capacitor. The case has an internal space, an opening communicating with the internal space, and a holding portion provided in the internal space. The optical flame detection element is disposed in the internal space of the case and exposed from the opening. The lead wire is electrically connected to the optical flame sensing element and extends from the optical flame sensing element to the side opposite to the opening. The capacitor is electrically connected to the optical flame detection element, and is held in the holding portion with a gap from the lead wire in the internal space.

  According to the flame detection device of the present invention, the capacitor is held in the holding portion with a clearance from the lead wire in the internal space. Therefore, even if dew condensation occurs on the surface of the capacitor, the lead is caused by dew condensation water adhering to the capacitor surface. The occurrence of a short circuit between the lines can be suppressed.

  Said flame detection apparatus is further provided with the insulating material arrange | positioned at the clearance gap. For this reason, a capacitor | condenser and a lead wire are insulated by an insulating material. As a result, it is possible to prevent a short circuit from occurring between the lead wires due to the condensed water adhering to the surface of the capacitor.

  The flame detection device further includes a clamp portion provided outside the case, and an electric wire that is electrically connected to the lead wire in the internal space and protrudes outside the case. The electric wire is sandwiched between the clamp portions. For this reason, an electric wire can be fixed with the clamp part provided in the outer side of the case.

  In the above-described flame detection device, the clamp part includes a connecting part and first and second pressing parts connected to face each other by the connecting part. The first pressing part includes a first extending part and a first claw part protruding from the first extending part toward the second pressing part. The second pressing portion includes a second extending portion and a second claw portion protruding from the second extending portion toward the first pressing portion. The 1st nail | claw part is arrange | positioned and shifted | deviated from the 2nd nail | claw part in the direction where a 1st nail | claw part protrudes. For this reason, an electric wire can be firmly fixed by pinching an electric wire between a 1st nail | claw part and a 2nd nail | claw part.

  The heat source apparatus of the present invention includes the above-described flame detection device and a combustion device for burning the fuel to generate a flame. The flame detection device is attached to the combustion device so that a flame can be detected. For this reason, the heat source machine provided with the flame detection apparatus which can suppress that a short circuit generate | occur | produces between lead wires with the dew condensation water adhering to the surface of a capacitor | condenser can be obtained.

  As described above, according to the present invention, it is possible to provide a flame detection device capable of suppressing the occurrence of a short circuit due to condensed water, and a heat source device including the flame detection device.

It is a perspective view showing roughly the composition of the flame detector in one embodiment of the present invention. It is a perspective view which shows the state which opened the case of the flame detection apparatus shown in FIG. It is sectional drawing which shows the structure of a photodiode roughly. It is sectional drawing which follows the IV-IV line of FIG. It is an enlarged view which shows the P section of FIG. It is sectional drawing which shows schematically the structure of the modification of the flame detection apparatus in one embodiment of this invention. It is a perspective view which shows roughly the structure of the clamp part in one embodiment of this invention. It is a perspective view which shows roughly the structure seen from the opening direction of the clamp part in one embodiment of this invention. It is a perspective view showing roughly the state where the flame detector in one embodiment of the present invention was attached to the subject. It is a schematic diagram showing roughly the composition of the heat source machine in one embodiment of the present invention. It is a fragmentary sectional view which shows roughly the structure by which the flame detection apparatus in one embodiment of this invention was attached to the combustion apparatus. It is a figure which shows a mode that the flame detection apparatus shown in FIG. 11 detects the flame of a combustion apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, the configuration of the flame detection device of the present embodiment will be described.

  With reference to FIG. 1 and FIG. 2, the flame detection apparatus 100 of this Embodiment is the case 101, the optical flame detection element 102, the lead wire 103, the capacitor | condenser 104, the terminal 105, the electric wire 106, It mainly has a connection fitting 107 and a clamp part CP.

  The case 101 has a substantially cylindrical shape. The tip of the case 101 is bent in the axial direction of the case 101. Case 101 has 1st case part CA1, 2nd case part CA2, and connection part CA3 which connects 1st case part CA1 and 2nd case part CA2. The case 101 is configured to be able to open and close the first case part CA1 and the second case part CA2 via the connection part CA3.

  The case 101 includes an internal space IS, an opening 101a, a holding portion 101b, an insertion portion 101c, a receiving portion 101d, a locking portion 101e, and a mounting portion 101f. The case 101 is configured to accommodate the optical flame detection element 102, the lead wire 103, the capacitor 104, the terminal 105, and a part of the electric wire 106 in the internal space IS. The internal space IS is a space surrounded by the outer wall of the case 101.

  The opening 101a communicates with the internal space IS. The opening 101 a is for exposing the optical flame detection element 102 to the outside of the case 101. The opening 101 a is a through hole that penetrates the case 101 in the axial direction of the case 101. The opening 101 a is formed at one end of the case 101 in the axial direction.

  The holding part 101b is provided in the internal space IS. The holding unit 101 b is for holding the capacitor 104. The holding part 101b is formed in a part of the partition part WP. The partition portion WP protrudes from the outer wall of the case 101 into the internal space IS, and extends in the axial direction of the case 101. The internal space IS is partitioned by the partition portion WP. The holding portion 101b protrudes from the outer wall of the case 101 toward the internal space IS. The holding portion 101b is formed at the approximate center of the case 101 in the axial direction.

  The insertion part 101c communicates with the internal space IS. The insertion part 101c is for drawing the electric wire 106 out of the case 101. The insertion portion 101 c is a through hole that penetrates the case 101 in the axial direction of the case 101. The insertion portion 101c is formed at the other end opposite to one end of the case 101 in the axial direction.

  The receiving portion 101d is for locking the locking portion 101e. The receiving portion 101d is formed so as to surround the hole SP. The receiving portion 101 d protrudes outward from the outer wall of the case 101 and extends in the radial direction of the case 101. The receiving portion 101d is provided in the first case portion CA1.

  The locking portion 101 e protrudes outward from the outer wall of the case 101, and extends in a direction that intersects the radial direction of the case 101. The locking portion 101e has a protrusion PP at the tip. The projecting portion PP projects outward from the locking portion 101e. The locking part 101e is provided in the second case part CA2. The locking portion 101e is formed so as to be inserted into the hole SP with the case 101 closed. The protruding portion PP is formed to be locked to the receiving portion 101d in a state where the locking portion 101e is inserted into the hole SP. That is, the case 101 is closed when the protrusion PP of the locking portion 101e is locked to the receiving portion 101d, and the case 101 is not locked to the receiving portion 101d of the protrusion PP of the locking portion 101e. Can be open.

  The attachment portion 101f is for attaching the flame detection device 100 to an object. The attachment portion 101 f protrudes outward from the outer wall of the case 101, and extends in a direction that intersects the radial direction of the case 101. The attachment portion 101f has two columnar portions extending side by side. The shaft portion of the screw is inserted between the two columnar portions, and the mounting portion 101f can be screwed to the object by screwing in a state where the head portion of the screw is in contact with the two columnar portions.

  The optical flame detection element 102 is disposed in the internal space IS of the case 101. The optical flame detection element 102 is disposed in the vicinity of one end of the case 101 in the axial direction. The optical flame detection element 102 is exposed from the opening 101a. The optical flame detection element 102 is configured to optically detect a flame. The optical flame detection element is, for example, a photodiode. This photodiode may be a photo IC diode.

  The lead wire 103 is electrically connected to the optical flame detection element 102. The lead wire 103 extends from the optical flame detection element 102 to the side opposite to the opening 101a. The lead wire 103 has a first lead wire 103a and a second lead wire 103b. The first lead wire 103a and the second lead wire 103b are arranged in parallel to each other. A partition WP is disposed between the first lead wire 103a and the second lead wire 103b.

  With reference to FIG. 3, the structure of the photo IC diode and the lead wire 103 as the optical flame detection element 102 of the present embodiment will be described in detail. The photo IC diode includes a mold resin 102a, an IC chip 102b, a die bond resin 102c, a bonding wire 102d, and a lead portion 102e.

  The mold resin 102a seals the IC chip 102b. The mold resin 102a is, for example, an epoxy resin and a transparent resin. The mold resin 102a is formed in a cylindrical shape. The IC chip 102b has a light receiving portion, and is configured to be able to detect a flame from the arrow direction in the figure at the center in the radial direction of the mold resin 102a. The IC chip 102b is connected to the lead portion 102e by a die bond resin 102c. The die bond resin 102c is, for example, a resin in which silver is mixed with an epoxy resin. The IC chip 102b is electrically connected to the lead portion 102e by a bonding wire 102d made of, for example, gold.

  The lead portion 102e is electrically connected to the lead wire 103. Specifically, the lead portion 102 e is formed integrally with the lead wire 103. The lead wire 103 is bonded to the mold resin 102a by the bonding material 200. The bonding material 200 is, for example, solder.

  Referring to FIGS. 1 and 2 again, the capacitor 104 is for removing noise. The capacitor 104 is electrically connected to the optical flame detection element 102. The capacitor 104 is held by the holding unit 101b in the internal space IS. The capacitor 104 is disposed above the first lead wire 103a and the second lead wire 103b in a direction in which the holding portion 101b protrudes from the outer wall of the case 101 toward the internal space IS. The capacitor 104 is disposed so as to overlap the first lead wire 103a and the second lead wire 103b. The capacitor 104 is formed across the first lead wire 103a and the second lead wire 103b when viewed from the direction in which the first lead wire 103a and the second lead wire 103b and the capacitor 104 overlap.

  Terminal 105 is electrically connected to capacitor 104. The terminal 105 includes a first terminal 105a and a second terminal 105b. The first terminal 105a and the second terminal 105b are arranged in parallel to each other. A partition portion WP is disposed between the first terminal 105a and the second terminal 105b.

  The electric wire 106 is electrically connected to the lead wire 103 in the internal space IS and protrudes outside the case 101. The electric wire 106 includes a first electric wire 106a and a second electric wire 106b. The first electric wire 106a and the second electric wire 106b are arranged in parallel to each other. A partition portion WP is disposed between the first electric wire 106a and the second electric wire 106b. The first electric wire 106 a and the second electric wire 106 b extend from the insertion portion 101 c to the outside of the case 101.

  The connection fitting 107 includes a first connection fitting 107a and a second connection fitting 107b. The first first lead wire 103a, the first terminal 105a, and the first electric wire 106a are each connected to the first connection fitting 107a. The second lead wire 103b, the second terminal 105b, and the second electric wire 106b are each connected to the second connection fitting 107b. Thereby, the optical flame detection element 102, the lead wire 103, the capacitor 104, the terminal 105, and the electric wire 106 are electrically connected to each other. The first lead wire 103a, the second lead wire 103b, the first terminal 105a, and the second terminal 105b are connected to the first connection fitting 107a and the second connection fitting 107b, respectively, by caulking. May be. The capacitor 104 has an optical flame detection by the first terminal 105a, the first connection fitting 107a, the first lead wire 103a and the second terminal 105b, the second connection fitting 107b, and the second lead wire 103b. The element 102 is electrically connected in parallel. Note that the lead wire 103, the terminal 105, and the connection terminal 107 may be electrically connected by soldering.

  Referring to FIGS. 4 and 5, capacitor 104 is disposed obliquely with respect to lead wire 103. The capacitor 104 is inclined with respect to the lead wire 103 at substantially the same angle as the terminal 105. The terminal 105 is connected to the electric wire 106 at an angle.

  The capacitor 104 is held by the holding portion 101b with a lead wire 103 and a gap GP. The holding portion 101 b is disposed at a position higher than the lead wire 103. That is, the lead wire 103 is disposed between the outer wall of the case 101 and the holding portion 101b. As a result, a gap GP is generated between the surface of the capacitor 104 held by the holding unit 101 b and the lead wire 103. Therefore, the surface of the capacitor 104 is not in contact with the lead wire 103.

  Further, referring to FIG. 6, as shown in a modification of the present embodiment, an insulating material IP may be disposed in the gap GP between the capacitor 104 and the lead wire 103. In the modification of the present embodiment, an insulating tube is used as the insulating material IP. Specifically, the lead wire 103 is covered with an insulating tube.

  1, 7 and 8, the flame detection device of the present embodiment is provided with a clamp portion CP. In addition, this clamp part CP does not need to be provided.

  Referring mainly to FIG. 1, the clamp portion CP is provided outside the case 101. The clamp portion CP is disposed at the approximate center in the axial direction of the case 101. The clamp portion CP is configured so as to be fixed by sandwiching the electric wire 106 by elasticity. The clamp part CP is formed in a U shape. Specifically, the clamp portion CP has an opening on one end side in the axial direction of the case 101 and is connected on the other end side in the axial direction of the case 101. This opening is configured such that the electric wire 106 can be inserted. The electric wire 106 is sandwiched between the clamp portions CP.

  Subsequently, the configuration of the clamp portion CP will be described in more detail mainly with reference to FIGS. 7 and 8. The clamp part CP includes a connecting part 110, a first pressing part 111, and a second pressing part 112. The first pressing portion 111 and the second pressing portion 112 are connected to each other by a connecting portion 110.

  The first pressing portion 111 has a first extending portion 111a and a first claw portion 111b. The first extending portion 111 a extends along the axial direction of the case 101. The 1st nail | claw part 111b protrudes toward the 2nd holding | suppressing part 112 from the 1st extension part 111a. The second pressing portion 112 has a second extending portion 112a and a second claw portion 112b. The second extending portion 112 a extends along the axial direction of the case 101. The 2nd nail | claw part 112b protrudes toward the 1st holding | suppressing part 111 from the 2nd extension part 112a. The 1st nail | claw part 111b is shifted | deviated from the 2nd nail | claw part 112b in the direction in which the 1st nail | claw part 111b protrudes. That is, the 1st nail | claw part 111b has shifted | deviated to the 2nd nail | claw part 112b, and was arrange | positioned up and down. Thereby, the electric wire 106 is clamped and fixed between the first claw portion 111b and the second claw portion 112b.

  The first claw portion 111b has a first taper portion 111c. The first tapered portion 111c is formed so that the cross-sectional area decreases from the first extending portion 111a side toward the second claw portion 112b. The 2nd nail | claw part 112b has the 2nd taper part 112c. The second tapered portion 112c is formed so that the cross-sectional area decreases from the second extending portion 112a side toward the first claw portion 111b. The first taper portion 111c is formed to face the second taper portion 112c. The electric wire 106 is diagonally sandwiched between the first taper part 111c and the second taper part 112c. Thereby, the shift | offset | difference of the electric wire 106 can be suppressed.

  Referring to FIG. 9, electric wire 106 is sandwiched and fixed by clamp portion CP in a state where flame detection device 100 is attached to the object. Moreover, the flame detection apparatus 100 is fixed to the object with screws 300. Specifically, the shaft portion of the screw 300 is inserted between the two columnar portions of the attachment portion 101f, and the screws 300 are tightened with the heads of the screws 300 in contact with the two columnar portions.

Next, the structure of the heat source machine provided with the flame detection apparatus of this Embodiment is demonstrated.
Referring to FIG. 10, the heat source device 1 of the present embodiment includes a housing 2, a combustion device 3, a blower 4, a primary heat exchanger 5, a secondary heat exchanger 6, and an exhaust collecting cylinder 7. The silencer 8, the neutralizer 9, the pipe 10, the water supply pipe 11, the water inlet 11 a, the hot water supply pipe 12, the hot water outlet 12 a, and the flame detector 100 are mainly included.

  The housing 2 is configured to accommodate a primary heat exchanger 5, a secondary heat exchanger 6, an exhaust collecting cylinder 7, a silencer 8, a neutralizer 9, a pipe 10, a water supply pipe 11, and a hot water supply pipe 12. Yes. An exhaust port EP is provided on the front surface of the housing 2. The exhaust port EP is configured such that combustion gas from which sensible heat has been recovered by the primary heat exchanger 5 and latent heat has been recovered by the secondary heat exchanger 6 can be exhausted to the outside of the housing 2. Further, the side surface of the housing 2 is provided with a water inlet 11a for water supply and a hot water outlet 12a for hot water supply.

  The combustion device 3 is for burning a fuel to generate a flame. The combustion device 3 generates combustion gas for performing heat exchange between the primary heat exchanger 5 and the secondary heat exchanger 6 and supplies the combustion gas to the primary heat exchanger 5 and the secondary heat exchanger 6. Is. The combustion device 3 is a reverse combustion type device in which fuel such as kerosene supplied from a fuel supply source (not shown) via a fuel pipe is sprayed downward and burned. Specifically, the combustion device 3 is, for example, a gun type burner.

  The blower 4 is for supplying air necessary for combustion to the combustion device 3. The blower 4 is configured to be able to supply combustion air downward from above the combustion device 3. Specifically, the blower 4 is a fan, for example.

  The primary heat exchanger 5 is a sensible heat recovery type heat exchanger. The hot water in the primary heat exchanger 5 is heated by heat exchange with the high-temperature combustion gas. The secondary heat exchanger 6 is a latent heat recovery type heat exchanger. The combustion gas after heat exchange in the primary heat exchanger 5 is passed to the secondary heat exchanger 6 so that the water in the secondary heat exchanger 6 is preheated. In this process, the temperature of the combustion gas is lowered to about 60 ° C., so that moisture contained in the combustion gas is condensed and latent heat can be obtained.

  One end of the primary heat exchanger 5 and one end of the secondary heat exchanger 6 are connected to each other by a pipe 10. A water supply pipe 11 is connected to the other end of the secondary heat exchanger 6, and a hot water supply pipe 12 is connected to the other end of the primary heat exchanger 5. The primary heat exchanger 5 is arranged closer to the combustion device 3 than the secondary heat exchanger 6.

  The exhaust collecting cylinder 7 and the silencer 8 constitute a combustion gas flow path connected in series. The exhaust collecting cylinder 7 is located on the downstream side of the primary heat exchanger 5. The silencer 8 is located on the downstream side of the exhaust collecting cylinder 7. As shown by the arrows in the figure, the combustion gas generated in the combustion device 3 passes through the periphery of the primary heat exchanger 5 and exchanges heat with the water of the primary heat exchanger 5, and then silences through the exhaust collecting cylinder 7. Sent to vessel 8. The combustion gas sent to the silencer 8 passes through the periphery of the secondary heat exchanger 6 and exchanges heat with the water in the secondary heat exchanger 6, and is then discharged out of the housing 2 through the exhaust port EP.

  Since the condensed water (drain) is generated due to the structure in which the water vapor of the combustion gas is condensed in the secondary heat exchanger 6 as described above, drainage of the drain is necessary. A neutralizer 9 is disposed below the secondary heat exchanger 6, and drainage is drained from the secondary heat exchanger 6 to the neutralizer 9. Since the combustion gas contains nitrogen oxides and the like, it dissolves in the drain and the drain becomes acidic. The neutralizer 9 is for neutralizing the acidic drain. The neutralizer 9 is filled with a neutralizing agent for neutralizing acidic drain. The drain neutralized by the neutralizer 9 is discharged out of the housing 2 through a drainage channel (not shown).

  The water inlet 11 a is connected to the water supply pipe 11 and configured to supply water to the primary heat exchanger 5 and the secondary heat exchanger 6 via the water supply pipe 11. The hot water outlet 12a is connected to the hot water supply pipe 12, and is configured to be able to supply hot water heated by the primary heat exchanger 5 and the secondary heat exchanger 6. Thereby, when the water supplied from the water inlet 11a passes through the primary heat exchanger 5 and the secondary heat exchanger 6, it is heated by the combustion gas and supplied from the hot water outlet 12a.

  In the present embodiment, the flame detection device 100 is configured to detect a flame in the combustion device 3. The flame detection apparatus 100 is attached to the combustion apparatus 3 so that a flame can be detected.

  Next, a configuration in which the flame detection device 100 is attached to the combustion device 3 will be described in more detail with reference to FIG. In FIG. 11, for convenience of explanation, a part of the combustion device 3 is shown broken away.

  The combustion apparatus 3 mainly includes a primary air cylinder 30, a fuel nozzle 31, a burner cone 32, a diffusion plate 33, a rectifying cylinder 34, a burner case 35, and an igniter 36. The fuel nozzle 31 is connected to the upper surface of the burner case 35 in the primary air cylinder 30. An igniter 36 is disposed in the primary air cylinder 30 in the vicinity of the jet outlet at the tip of the fuel nozzle 31.

  The primary air cylinder 30, the fuel nozzle 31, the burner cone 32, the rectifying cylinder 34, and the igniter 36 are disposed inside the burner case 35. The burner case 35 has an upper surface, a side wall 35a, and a holding surface (bottom surface) 35b. The flame detection device 100 is attached to the side wall 35 a of the burner case 35. The tip of the flame detection device 100 is disposed inside the burner case 35. Further, the blower 4 is connected to the upper surface of the burner case 35 so as to blow air into the burner case 35.

  The primary air cylinder 30 is provided so as to surround the fuel nozzle 31 coaxially when viewed from the upper surface side of the burner case 35. The primary air cylinder 30 is disposed above the burner cone 32. The primary air cylinder 30 is curved so that its diameter decreases toward the bottom, and has an opening at the bottom. The primary air cylinder 30 is configured such that fuel sprayed downward from the fuel nozzle 31 through the opening at the bottom is supplied to the inside of the burner cone 32.

  The fuel nozzle 31 is for supplying fuel. The fuel nozzle 31 is connected to the fuel pipe 13, and is connected to a fuel supply source (not shown) via the fuel pipe 13. The fuel nozzle 31 is configured to spray fuel such as kerosene supplied via the fuel pipe 13 downward toward the inside of the burner cone 32.

  The burner cone 32 is disposed in front of the fuel nozzle 31 in the direction in which the fuel nozzle 31 supplies fuel. Since the combustion apparatus 3 according to the present embodiment is a reverse combustion type, the burner cone 32 is disposed below the fuel nozzle 31. The burner cone 32 is formed in a cylindrical shape. Specifically, the burner cone 32 has a small diameter portion arranged on the fuel nozzle 31 side and a large diameter portion arranged on the opposite side of the fuel nozzle 31 with respect to the small diameter portion. The burner cone 32 has a first peripheral wall portion 32a. The burner cone 32 is for burning the fuel supplied from the fuel nozzle 31 on the inner peripheral side of the first peripheral wall portion 32a to generate a flame. A first through hole 32b is provided in the first peripheral wall portion 32a. Specifically, the first through hole 32b is formed in the large diameter portion. A plurality of first through holes 32b are formed. The plurality of first through holes 32 b are arranged at substantially equal intervals in the circumferential direction of the burner cone 32. The plurality of first through holes 32b are arranged at substantially the same height. A plurality of through holes are also formed in the small diameter portion of the burner cone 32.

  The diffusion plate 33 is attached to the holding surface 35 b of the burner case 35. The diffusion plate 33 is formed so as to extend in the radial direction through the center portion of the burner cone 32. The diffusion plate 33 is formed so as to block a part of the burner cone 32 in the radial direction. The diffusion plate 33 divides the flame and generates a flame vortex. Thereby, a uniform flame is realized. The diffusion plate 33 can also prevent the flame from reaching the primary heat exchanger 5.

  The rectifying cylinder 34 is for flowing air around the burner case 35. The rectifying cylinder 34 is formed in a cylindrical shape. The rectifying cylinder 34 has a second peripheral wall portion 34a. A second through hole 34b is provided in the second peripheral wall portion 34a. The rectifying cylinder 34 is coaxial with the burner cone 32 at a distance from the first peripheral wall portion 32a on the outer peripheral side of the first peripheral wall portion 32a so that the second through hole 34b overlaps the first through hole 32b. Has been placed.

  The burner case 35 is configured to accommodate the burner cone 32 and the rectifying cylinder 34. The side wall 35a is arranged on the outer peripheral side of the second peripheral wall portion 34a with a space from the second peripheral wall portion 34a.

  The flame detection device 100 is disposed on the outer peripheral side of the first peripheral wall portion 32a. The flame detection device 100 is configured to detect a flame from the first through hole 32b and the second through hole 34b. The flame detection device 100 is located on the outer peripheral side of the burner cone 32 and is configured to detect a flame on the inner peripheral side of the burner cone 32. The flame detection device 100 is disposed toward the inside of the burner cone 32 in a direction orthogonal to the vertical direction of the combustion device 3. The flame detection device 100 may be disposed so as to be orthogonal to the coaxial axes of the fuel nozzle 31, the burner cone 32, and the rectifying cylinder 34.

  Next, how the flame detection device 100 of the present embodiment detects the flame of the combustion device 3 will be described.

  Referring to FIG. 12, air is supplied from the blower 4 into the burner case 35. A part of this air is introduced into the primary air cylinder 30 through an inlet (not shown). Another part of the air is introduced into the rectifying cylinder 34, and part of the air is introduced into the burner cone 32 from the plurality of through holes in the small diameter portion and the plurality of first through holes 32 b in the large diameter portion. be introduced. The remaining air flows between the burner case 35 and the rectifying cylinder 34. The air that has entered the primary air cylinder 30 flows toward the fuel nozzle 31, and is sent into the burner cone 32 from the opening at the bottom of the primary air cylinder 30 together with the fuel sprayed downward from the fuel nozzle 31.

  This fuel is ignited by the igniter 36 and burned in the burner cone 32. That is, a diffusion flame is generated in the burner cone 32 in the fuel spray direction (the direction of arrow A in the figure). An arrow A direction in this figure is a coaxial direction of the fuel nozzle 31, the burner cone 32, and the rectifying cylinder 34. The flame detection device 100 detects the flame in the burner cone 32 through the first through hole 32b and the second through hole 34b. The flame detection apparatus 100 detects a flame in the direction of arrow B in the figure that intersects the flame extending in the direction of arrow A in the figure. In this way, the presence or absence of combustion in the combustion device 3 is detected by detecting the flame of the combustion device 3 by the flame detection device 100.

Next, the effect of this Embodiment is demonstrated.
According to the flame detection apparatus 100 of the present embodiment, since the capacitor 104 is held in the holding portion 101b with the gap 103 between the lead wire 103 in the internal space IS, even if condensation occurs on the surface of the capacitor 104, the capacitor The occurrence of a short circuit between the first lead wire 103a and the second lead wire 103b due to condensed water adhering to the surface of 104 can be suppressed.

  In the modified example of the flame detection apparatus 100 of the present embodiment, since the insulating material IP disposed in the gap GP is provided, the capacitor 104, the first lead wire 103a, and the second lead wire 103b are separated by the insulating material IP. Is insulated. Thereby, it is possible to prevent a short circuit from occurring between the first lead wire 103a and the second lead wire 103b due to dew condensation water adhering to the surface of the capacitor 104.

  The flame detection apparatus 100 according to the present embodiment includes a clamp portion CP provided outside the case 101, and the electric wire 106 is sandwiched between the clamp portions CP. For this reason, the electric wire 106 can be fixed by the clamp part CP provided outside the case 101. By sandwiching the electric wire 106 in the clamp portion CP, the electric wire 106 can be prevented from coming into contact with the high temperature portion of the combustion device 3 and burning.

  In the flame detection device 100 according to the present embodiment, the first claw portion 111b is displaced from the second claw portion 112b in the direction in which the first claw portion 111b protrudes. For this reason, the electric wire 106 can be firmly fixed when the electric wire 106 is inserted | pinched between the 1st nail | claw part 111b and the 2nd nail | claw part 112b.

  In the heat source device 1 of the present embodiment, the flame detection device 100 is attached to the combustion device so that the flame can be detected. For this reason, the heat source apparatus including the flame detection device 100 that can suppress the occurrence of a short circuit between the first lead wire 103a and the second lead wire 103b due to dew condensation water adhering to the surface of the capacitor 104. 1 can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Heat source machine, 2 Housing, 3 Combustion device, 4 Blower, 5 Primary heat exchanger, 6 Secondary heat exchanger, 7 Exhaust gas collection cylinder, 8 Silencer, 9 Neutralizer, 10 Piping, 11 Feed water piping, 11a Water port, 12 Hot water supply pipe, 12a Hot water outlet, 13 Fuel pipe, 30 Primary air cylinder, 31 Fuel nozzle, 32 Burner cone, 33 Diffuser plate, 34 Rectifier cylinder, 35 Burner case, 36 Igniter, 100 Flame detection device, 101 case , 101a Opening portion, 101b Holding portion, 101c Insertion portion, 101d Receiving portion, 101e Locking portion, 101f Mounting portion, 102 Optical flame detection element, 103 Lead wire, 103a First lead wire, 103b Second lead wire , 104 capacitor, 105 terminal, 105a first terminal, 105b second terminal, 106 electric wire, 107 connection metal 106a 1st electric wire, 106b 2nd electric wire, 110 connection part, 111 1st holding | suppressing part, 111a 1st extension part, 111b 1st nail | claw part, 111c 1st taper part, 112 2nd Press part, 112a 2nd extension part, 112b 2nd nail | claw part, 112c 2nd taper part, CP clamp part, GP gap, IP insulating material, IS internal space.

Claims (5)

A case having an internal space, an opening communicating with the internal space, and a holding portion provided in the internal space;
An optical flame detection element disposed in the internal space of the case and exposed from the opening;
A lead wire electrically connected to the optical flame sensing element and extending from the optical flame sensing element to the opposite side of the opening;
A flame detection apparatus comprising: a capacitor electrically connected to the optical flame detection element and provided in the internal space with a gap between the lead wire and the holding unit.   The flame detection device according to claim 1, further comprising an insulating material disposed in the gap. A clamp provided on the outside of the case;
An electrical wire that is electrically connected to the lead wire in the internal space and protrudes to the outside of the case;
The flame detection device according to claim 1, wherein the electric wire is sandwiched between the clamp portions. The clamp part is
A connecting part;
Including first and second pressing portions connected to face each other by the connecting portion,
The first pressing portion includes a first extending portion and a first claw portion protruding from the first extending portion toward the second pressing portion,
The second pressing part includes a second extending part and a second claw part protruding from the second extending part toward the first pressing part,
The flame detection device according to claim 3, wherein the first claw portion is arranged so as to be shifted from the second claw portion in a direction in which the first claw portion protrudes. The flame detection device according to any one of claims 1 to 4,
A combustion device for combusting fuel to generate a flame,
The flame detection device is a heat source device attached to the combustion device so as to be able to detect the flame.

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