JP2005345004A - Ignitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignitor in which connection both on the high voltage output side and on the grounding side is completed at a time in directly connecting a discharge electrode part to a main body, to improve assembling efficiency. <P>SOLUTION: Guide rails 42 and 42 in a housing 41 of the main body 4 are inserted and engaged in slits 243 and 243 between holding pieces 242, 241 and 242 in a bracket 2 fixed to a burner case, so that the main body is installed on the bracket. In accordance with insertion engagement, a high voltage input terminal 322 of an ignition plug held on the bracket is received by a high voltage output terminal 45 to be continued and connected. A plate terminal 271 as part of the bracket is thus inserted into a grounding side connection terminal 46 for continuity connection. A protrusion 43 in a protruded member 44 is engaged with an engagement hole 25 to be positioned, and prevented from coming off. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is an ignition device used for igniting a burner in a combustion apparatus such as a water heater or a heating device for burning liquid fuel (petroleum) or gaseous fuel (gas), and generates a spark discharge from a discharge electrode. The present invention relates to an ignition device configured to ignite and burn fuel ejected from a burner.

  This type of ignition device is also called an igniter. Conventionally, as such an ignition device, a discharge electrode for generating a spark discharge and a transformer built in a housing are provided, and the transformer receives power from a commercial power source for discharging at the discharge electrode. There is known one in which the transformer and the discharge electrode are connected so that the high voltage is transformed to a high voltage and the high voltage current flows through the discharge electrode (see Patent Document 1).

  And what connected the high voltage output part by the side of a housing | casing and a discharge electrode by insertion work is proposed (refer patent document 2). In this case, the high-voltage output portion on the housing side is constituted by a pair of elastic plates in elastic contact with each other, and the plate-like connection portion on the base end side of the discharge electrode is inserted between the elastic plates, thereby The connecting portion is sandwiched between the pair of elastic plates.

No. 1-8859 JP 2001-248838 A

  By the way, normally, the casing is made of synthetic resin, and an electronic component for generating a high voltage is disposed inside the casing, while the discharge electrode is disposed in the vicinity of the burner. Then, the fuel ejected from the burner to the combustion chamber receives a spark discharge from the discharge electrode and is ignited, thereby starting combustion. Therefore, in a combustion apparatus such as a water heater, the discharge electrode constituting the ignition device is disposed at a position exposed to the combustion chamber and directly receiving the combustion heat, that is, an inner position of the burner case. Is disposed outside the burner case at a position where it does not receive combustion heat directly. For this reason, the ignition device is assembled through the assembly work such as the connection work between the discharge electrode and the housing containing the electronic component for generating the high voltage and the individual fixing work.

  However, the conventional ignition device has the following various disadvantages. That is, first, not only the high voltage output part of the housing is connected to the discharge electrode, but also the ground side of the spark discharge from the discharge electrode needs to be connected to the housing side. Secondly, even if the connection between the discharge electrode and the high voltage output portion of the housing is not a connection using a cord or the like but directly by mechanical coupling as proposed in Patent Document 2, the discharge electrode and the high voltage output portion are connected. Both of them need to be firmly integrated so as not to be relatively displaced with respect to the housing containing the output unit. Third, when a measure is adopted in which the discharge electrode and the housing are simply connected without being integrated, and are individually fixed to the burner case or the like by means such as screws. The assembling work of the ignition device is very time-consuming due to the fixing work. Fourthly, it is necessary to prevent excessive thermal influence from the combustion heat from the burner case side from acting on the casing during the integration or fixing. Fifth, when the connection between the discharge electrode and the high-voltage output unit in the housing is performed by an insertion operation, a high-voltage current flows. It is necessary to have a structure that can guarantee what has been done. Sixth, when the discharge electrode is directly connected to the high voltage output section in the housing, the discharge electrode is disposed in the vicinity of the burner, so that the connection portion is in the vicinity of the burner case. Therefore, it is necessary to prevent the occurrence of high-voltage leakage (for example, spark leakage) from the edge of the connection portion.

  The present invention has been made in view of the circumstances as described above, and the object of the present invention is to improve the efficiency and labor saving of assembly work in particular while eliminating the various disadvantages as described above. It is to provide an ignition device.

  In order to achieve the above object, according to the present invention, a bracket fixed to a partition wall constituting a part of an ignition target, and an ignition for igniting the ignition target by spark discharge held by the bracket so as to penetrate the partition wall. A plug and a main body that houses the high-voltage output portion for spark discharge in the housing and is attached to the bracket are provided, and the bracket serves as a bracket from the ignition target that has received the spark discharge together with the partition wall. It is formed of a conductive material so as to constitute a part of the ground side circuit, and as the ignition plug, the discharge electrode portion on the tip side can blow a spark discharge to the ignition target at one position across the bracket. So that the high-voltage input terminal on the base end side protrudes in the predetermined direction at the other side position with the bracket in between. A high-voltage output terminal that is connected to the high-voltage output section and protrudes outward as the main body, and a ground-side connection that protrudes in the same direction and in parallel with the high-voltage output terminal. And a terminal. And by inserting and fitting the main body in the protruding direction of the high voltage output terminal and the ground side connection terminal with respect to the bracket, the high voltage output terminal with respect to the high voltage input terminal is inserted into the housing and the bracket of the main body. The mounting mechanisms for guiding and holding the ground side connection terminal and the conductive connection state are integrally formed so as to perform both the conductive connection and the conductive connection of the ground side connection terminal to the bracket.

  In the case of the invention according to claim 1, in a state where the bracket is fixed to the partition wall to be ignited (for example, fixed by screwing or the like), the spark plug is held by the bracket and the discharge electrode portion is located inside the partition wall. On the ignition target side, the high voltage input terminals are positioned outward from the partition wall. The high voltage of the ignition plug on the bracket side of the high-voltage output terminal on the main body side can be obtained simply by performing an insertion fitting operation in which the main body is inserted into the bracket in this state from the protruding direction, that is, one specific direction. Both the conductive connection to the input terminal and the conductive connection to the bracket of the ground side connection terminal on the main body side can be completed simultaneously. In the insertion / fitting operation, the mounting mechanism reliably guides the insertion direction and the progress of the insertion, and the conductive connection is reliably held when the mounting state is reached. . In a state where the main body is mounted on the bracket by the above-described insertion fitting operation, a predetermined high voltage is applied to the discharge electrode portion from the high voltage output portion through the high voltage output terminal and the high voltage input terminal, and the ignition target (burner) Etc.) spark discharge is blown. In response to this spark discharge, the fuel from the ignition target is ignited and combustion is started. On the other hand, the ignition target that has received the spark discharge is electrically connected to the ground-side connection terminal through a ground-side circuit constituted by the partition wall (burner case or the like) and a bracket fixed to the partition wall.

  In the present invention as described above, a more preferable action can be obtained by adding further specific items or adding more specific specifications as follows.

  First, a lock mechanism that locks the main body housing and the bracket in a state of being mounted by the mounting mechanism can be integrally formed. And as said locking mechanism, the convex part which is formed in one of the housing and bracket of the said main body, and protrudes in the direction orthogonal to the direction of the said insertion fitting, and this convex part is formed in the other, and this convex part crosses the said orthogonal A concave portion that is inserted from the direction, and as the convex portion and the concave portion, the convex portion reaches the insertion position into the concave portion by the insertion fitting, and the main body is attached to the bracket by the attachment mechanism. Thus, the convex portion is placed in the concave portion (Claim 2). By adding such a locking mechanism, the main body is mounted on the bracket, that is, the high voltage output terminal and the high voltage input terminal are conductively connected, and the ground side connection terminal and the bracket are conductively connected. It becomes possible to maintain the state more reliably. That is, since the convex portion constituting the locking mechanism is fitted in the concave portion with respect to the direction orthogonal to the insertion fitting direction, the main body is relative to all of the plane direction perpendicular to the fitting direction of the convex portion with respect to the bracket. Misalignment is prevented. As a result, it is possible to hold the mounting state of the main body more firmly by preventing the positional displacement of the main body in other directions as well as positioning of the mounting handling fixing position and fixing the main body to prevent the main body from being inserted in the insertion fitting direction. And the bracket can be more firmly integrated.

  The concave portion in such a lock mechanism is configured by an engagement hole formed through the bracket, and the convex portion extends from the housing of the main body in the same direction as the high voltage output terminal and protrudes from the distal end side of the protruding piece And the elastic pressing force can be applied to the projecting piece in the direction in which the convex portion is fitted into the engaging hole. By applying such elastic pressing force from the protruding piece, it is possible to reliably maintain the locked state in which the convex portion is fitted in the engagement hole, and the elastic pressing force is applied to the bracket from the main body side. Thus, the integration of the main body and the bracket can be further strengthened.

  Second, as the mounting mechanism, a guide rail that protrudes from the outer surface of the housing of the main body and extends parallel to the insertion fitting direction, and an outer surface of the housing with the guide rail sandwiched therebetween. And a sandwiching piece formed on the bracket so as to slide in the insertion fitting direction. In this case, a more specific configuration is specified as the mounting mechanism. Then, as an insertion fitting operation, the main body or the bracket is held along the outer surface of the housing with respect to the extension direction of the guide rail, that is, the insertion fitting direction in a state where the main body side guide rail is clamped by the clamping piece on the bracket side. Since the sliding is relatively performed, the direction of the inserting operation is automatically determined, and the inserting operation is surely guided by the above-described clamping. In this case, the guide rail may be one, two, or three or more. In addition, as a sandwiching piece for sandwiching these guide rails, it may be sandwiched by one sheet having a predetermined cross-sectional shape, or may be sandwiched by two or three flat edges. .

  The guide rail is a concave groove that opens on a side surface of the guide rail and extends linearly along the guide rail, and is an end edge that extends in the insertion fitting direction of the clamping pieces. It is also possible to form a recessed groove in which the is fitted. By performing the insertion fitting operation in such a state that the edge of the sandwiching piece is fitted in the concave groove of the guide rail, the position of the main body relative to the bracket in all directions of the three orthogonal axes is shifted. It is possible to mount the battery in a restrained state so that it does not occur, and it is possible to achieve a higher degree of integration between the main body and the bracket.

  Further, two guide rails are formed in the housing of the main body, while a central sandwiching piece that enters between the two guide rails in the bracket, and two outer sides disposed on the outer sides of the two guide rails. Forming the sandwiching piece, and the center sandwiching piece on each outer side in a state in which the center sandwiching piece is separated from the outer surface of the housing with the main body attached to the bracket and there is a space between them. The guide rail can be disposed so as to be sandwiched between the sandwiching pieces (claim 6). In this case, the outer surface of the main body can be shielded with the air layer interposed between the central sandwich pieces. For this reason, even if heat radiation is received from the partition to be ignited by the bracket to which the bracket is fixed, in addition to the heat reflection by the central sandwich piece, the heat insulation effect by the air layer is exerted, It becomes possible to suppress as much as possible the heat effect which a main body receives. As a result, the durability of the main body in which the high voltage output portion and the like are accommodated in the housing is improved, and the reliability of the ignition device itself is improved.

  Thirdly, the high-voltage output terminal can be accommodated in a cylindrical cover that protrudes from the housing of the main body and opens at the tip. By doing so, in the conductive connection state between the high voltage output terminal and the high voltage input terminal, avoid the possibility of leakage due to spark leak from the sharp end of the high voltage output terminal or the high voltage input terminal. Is possible. In particular, when the partition wall of the ignition device to which the bracket is fixed is located in the vicinity of the high voltage output terminal or the like in the conductive connection state, the occurrence of the leakage can be effectively avoided.

  When such a cylindrical cover is added, the high voltage input terminal is further formed in a rod shape, and the high voltage output terminal is received as the high voltage output terminal by inserting and fitting the main body. It has a tip opening, and the inner surface of the cylindrical cover is gradually reduced in diameter from the portion opened with a larger diameter than the tip opening of the high voltage output terminal to the tip opening of the high voltage output terminal. It can also be formed in a funnel shape (claim 8). By doing so, even if either or both of the high voltage output terminal and the high voltage input terminal are slightly misaligned in the work of inserting the main body into the bracket, the funnel shape of the cylindrical cover Therefore, the high voltage output terminal and the high voltage input terminal can be reliably connected to each other.

  Fourth, the ground side connection terminal is composed of two elastic strips that are overlapped with each other and bent so that the protruding end portions are opened to the outside, while the bracket is connected to the bracket along the insertion fitting direction. A plate-like terminal that extends and is inserted and fitted between the two elastic strips can be integrally formed (claim 9). The plate-like terminal enters between the projecting end portions of the two elastic band plates constituting the ground side connection terminal by the insertion and fitting operation of the main body with respect to the bracket, and the plate-like terminals are formed by two elastic band plates. The conductive connection is surely made while being sandwiched by the action of the elastic restoring force. In addition, since both protruding ends are bent so as to open to the outside, even if the ground side connection terminal and the plate-like terminal are slightly misaligned with each other in the insertion fitting work, the conductive connection is ensured. It is guided to the position and is connected in conduction.

  As described above, according to the ignition device of any one of claims 1 to 9, by simply performing an insertion fitting operation of inserting the main body into the bracket from a specific direction, Both the conductive connection to the high voltage input terminal of the spark plug on the bracket side of the high voltage output terminal and the conductive connection to the bracket of the ground side connection terminal on the main body side can be completed simultaneously. Moreover, the main body is assembled by direct connection excluding inclusions such as high-voltage cords, such as conductive connection between the high voltage output terminal and high voltage input terminal and assembly by conductive connection between the ground side connection terminal and the bracket. And the bracket holding the spark plug can be reliably integrated. And since the said insertion fitting is reliably guided by the mounting mechanism, said assembly operation can be performed easily and reliably.

  In particular, according to claim 2, by adding a lock mechanism, the mounting and fixing position of the main body can be surely positioned in the mounting operation of the main body with respect to the bracket, and the main body is prevented from coming off and fixed after mounting. Thus, the mounting state of the main body can be held more firmly, and the main body and the bracket can be firmly integrated.

  According to the third aspect, the locked state by the lock mechanism can be reliably maintained, and the integration of both the main body and the bracket can be further reinforced by the elastic pressing force from the main body side to the bracket.

  According to the fourth aspect, it is possible to provide a more specific configuration as the mounting mechanism, whereby it is possible to reliably guide the process until the mounting and fitting direction is automatically determined. .

  According to claim 5, the main body can be attached to the bracket in a state of being restrained so as not to be displaced in all the directions of the three orthogonal axes, and the integration of the main body and the bracket can be made stronger and Highly realizable.

  According to the sixth aspect, even when heat radiation is received from the partition to be ignited to which the bracket is fixed in association with the combustion of the ignition target, in addition to the heat reflection by the central sandwich piece, the heat insulation effect by the air layer is exhibited. Thus, the influence of heat on the main body can be suppressed as much as possible, and the reliability of the ignition device itself can be improved by improving the durability of the main body.

  According to claim 7, in the conductive connection state between the high voltage output terminal and the high voltage input terminal, it is possible to reliably avoid the possibility of leakage due to spark leak from the high voltage output terminal or the sharp end of the high voltage input terminal. can do.

  According to the eighth aspect of the present invention, in the insertion fitting of the main body to the bracket, the conductive connection between the high-voltage output terminal on the main body side and the high-voltage input terminal on the spark plug side is surely guided to further ensure the conductive connection. Can be done.

  According to the ninth aspect, in the mounting by inserting the main body into the bracket, it is possible to more reliably perform the guidance until the ground side connection terminal reaches the conductive connection and hold the conductive connection state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an exploded perspective view when the ignition device G according to the present invention is mounted on a combustion device F for a hot water heater. The combustion apparatus F includes a combustion burner 11 configured by arranging a plurality of rows of combustion tubes in a plurality of rows, and a burner case in which the combustion burner 11 is housed and the space of the combustion chamber 12 is defined above the combustion burner 11. 13 and a blower fan 14 for supplying combustion air to the combustion burner 11. Such a combustion apparatus 1 is used for heating water to a predetermined temperature by the combustion heat of the combustion burner 11 and supplying the heated hot water to a hot water tap or the like. Specifically, a can body (not shown) containing, for example, a fin-and-tube heat exchanger is joined and fixed to the upper flange 131 of the burner case 13 and is passed through the heat exchanger by the combustion heat of the combustion burner 11. The water to be heated is heat exchange heated. The combustion burner 11 is the “ignition target” of the present invention, and the trunk wall of the burner case 13 is the “partition wall” of the present invention. This burner case 13 is formed of a steel plate which is a conductive material, and forms a part of a ground side circuit as described later by coupling with the combustion burner 11.

  The ignition device G includes a bracket 2 fixed to the burner case 13 by screws 21 and 21, an ignition plug 3 held by the bracket 2, and a high-voltage output unit housed in a housing 41 which is a housing. The assembled main body 4 is assembled and integrated. In the figure, reference numeral 5 denotes a heat-resistant packing, and this heat-resistant packing 5 is sandwiched between the bracket 2 and the burner case 13, thereby blocking heat transfer from the burner case 13 to the bracket 2. And prevention of leakage of combustion exhaust gas. The burner case 13 is formed with a through hole 132 having a predetermined shape for penetrating the spark plug 3 and a through hole 133 for a viewing window. The burner case 13 is formed at a position corresponding to the through holes 132 and 133. A bracket 2 can be attached.

  Hereinafter, the components 2, 3, and 4 of the ignition device G will be described in detail with reference mainly to FIGS. FIG. 2 is a perspective view of the ignition device G in an exploded state, and FIG. 3 is a perspective view of the assembled and integrated state. In the following description, the direction in which the three orthogonal axes of X, Y, and Z extend is used as the direction, as shown in FIG. 1 or FIG. The X-axis direction is the vertical direction in the figure, the Y-axis direction is the front-rear direction, and the Z-axis direction is the left-right direction. Note that X, Y, or Z is the same in other drawings.

  As shown in detail in FIGS. 2 and 3, the spark plug 3 includes a body 31 formed of an insulator such as ceramic, a rod-shaped electrode conductor 32 that penetrates the body 31 in the Y-axis direction, Similarly, an ignition detection frame rod 33 penetrating the body 31 is provided. In this embodiment, the frame rod 33 is merely disposed on the same body 31 using the spark plug 3, and is not an essential component in the spark plug of the present invention. The body 31 includes an inner part 311 that fits in the through hole 132 of the burner case 13, an outer part 312 that fits in a holding hole 232 described later of the bracket 2, and a boundary position between the parts 311 and 312. The flange portion 313 protrudes larger than the through hole 132 and the holding hole 232. The flange portion 313 is for positioning and fitting with the bracket 2, and when the flange portion 313 is fitted into a holding portion 23 described later of the bracket 2, the spark plug 3 is fixed to the bracket 2. Positioning to the holding position is performed. The front end portion, which is the rear end portion of the conductor 32, is located in the combustion chamber 12 and is bent toward the combustion burner 11 so as to extend to a position near the combustion burner 11 to form a discharge electrode portion 321. A base end portion, which is an end portion, is located outside the burner case 13 and is bent in a predetermined direction (horizontal and rightward in FIGS. 2 and 3) to constitute a high voltage input terminal 322 (also FIG. 4). See).

  The bracket 2 is formed by bending a metal plate that is a conductive material, and the bracket 2 is electrically connected to the burner case 13 and the combustion burner 11 by screws 21 and 21. It itself constitutes a part of the ground side circuit. The bracket 2 includes a viewing window 22, a holding portion 23 for holding the body 31 of the spark plug 3, a mounting portion 24 for mounting the main body 4, and an engagement for restraining the main body 4 in the mounting state. And a hole 25. The viewing window 22 is formed by fitting a heat-resistant glass or a transparent quartz plate into the through hole. The holding portion 23 has a concave portion 231 in which the flange portion 313 of the body 31 of the spark plug 3 is fitted from the burner case 13 side and a hole shape corresponding to the outer peripheral shape of the outer portion 312, and is formed at the bottom of the concave portion 231. The holding hole 232 is opened. The viewing window 22 and the holding portion 23 are formed in a flat plate portion 26 that is in close contact with the packing 5 and is fixed to the burner case 13.

  The mounting portion 24 is bent from the position of the left and right sides (right side in FIGS. 2 and 3) of the flat plate portion 26 to the near side, and is formed with a step difference from the flat plate portion 26. Thereby, the mounting portion 24 is arranged at a position away from the burner case 13 by a predetermined amount in the state where the flat plate portion 26 of the bracket 2 is fixed to the burner case 13. Further, a projecting piece 27 that is bent from the lower edge position of the flat plate portion 26 and projects a predetermined amount toward the front side is continuously formed, and a flange piece 28 that is bent downward from the tip position of the projecting piece 27 is further formed. It is formed continuously. Then, a plate-like terminal 271 that is conductively connected to a later-described ground-side connection terminal 44 of the main body 4 is formed by one side edge (the right-side edge in FIGS. 2 and 3) of the protruding piece 27. An engagement hole 25 as a recess is formed through a predetermined position of the flange piece 28. A guide portion 281 that is bent so as to open obliquely outward is formed at the end of the flange piece 28 on the main body 4 side from the engagement hole 25. The engagement hole 25 constitutes a “lock mechanism” of the present invention together with a projecting piece 44 and a convex portion 43 described later of the main body 4.

  The mounting portion 24 constitutes a “mounting mechanism” of the present invention together with guide rails 42 and 42 (to be described later) of the main body 4, and includes a central clamping piece 241 and both outer sides sandwiching the central clamping piece 241. The outer pinching pieces 242 and 242 of the position are provided (see also FIG. 5). A slit 243 having a predetermined width s (see FIG. 6) is formed between the center sandwiching piece 241 and each outer sandwiching piece 242, while the center sandwiching piece 241 is bent at the root position to The outer sandwiching pieces 242 are formed so as to extend in parallel with each outer sandwiching piece 242 at a position closer to the burner case 13 than the outer sandwiching pieces 242.

  On the other hand, the main body 4 accommodates an electric circuit board (not shown) on which an electronic component such as a transformer constituting a high voltage output portion is mounted in a synthetic resin housing 41 for insulation and protection. The main body 4 includes two guide rails 42 and 42 that constitute a part of the mounting mechanism, a protruding piece 44 with a protrusion 43 that constitutes a part of the locking mechanism, and the electric circuit board. A high voltage output terminal 45 for applying the generated high voltage to the spark plug 3, a ground side connection terminal 46, and a power input terminal 47 for turning on the electric circuit board are provided.

  Both the guide rails 42 and 42 are formed integrally with the housing 41 so as to extend at a predetermined interval on the rear surface 411 of the housing 41 and to be parallel to each other in the Z-axis direction. The distance between the guide rails 42 and 42 is set to a dimension corresponding to the width (width in the X-axis direction) of the center sandwich piece 241 (see FIG. 6). Further, all or part of each guide rail 42 (a part in the present embodiment) is formed thick, and this thick part is opened to the outside (upper and lower sides) at a position flush with the rear surface 411. Thus, a concave groove 421 extending in the Z-axis direction is formed. The groove width of the concave groove 421 is set to a dimension corresponding to the thickness of the edge of the outer sandwiching piece 242 and the thickness of the guide rail 42 at the groove bottom of the concave groove 421 is set to the width s. Is set. In addition, the bracket 2 side of the concave groove 421 is formed so that the groove width is gradually enlarged and opened in order to guide the insertion fitting operation (see reference numeral 422 in FIG. 7).

  Therefore, as shown in FIG. 5, when the rear surface 411 of the main body 4 is brought into contact with the outer sandwiching pieces 242 and 242 of the mounting portion 24 of the bracket 2, the main body 4 is moved closer to the bracket 2 in the Z-axis direction. That is, when the left side is moved, the end edges of the both outer clamping pieces 242 and 242 are inserted into the recessed grooves 421 of the guide rails 42, respectively, and the main body 4 is inserted into the mounting portion 24 of the bracket 2 as shown in FIG. 6 and FIG. 7, it will be in the mounted state. In this mounted state, the pair of guide rails 42 and 42 are sandwiched from the outside over a predetermined length in the Z-axis direction by the both outer sandwiching pieces 242 and 242, and at the same time, the both outer sandwiching pieces 242 and 242. Each end edge is closely fitted into the concave groove 421 over a predetermined length in the Z-axis direction. For this reason, it is possible to securely prevent the positional deviation with respect to the X-axis direction and the Y-axis direction and firmly fix the housing 41 of the main body 4 to the bracket 2. In this mounted state, the outer sandwiching pieces 242 and 242 are in contact with each other, but cover the rear surface 411 of the housing 41, and the central sandwiching piece 241 is spaced apart from the rear surface 411 of the housing 41 and has a space therebetween. In a state where P is present, the rear surface 411 between the guide rails 42 and 42 is covered. For this reason, in particular, the radiant heat from the burner case 13 is not only reflected by the central sandwiching piece 241, but the radiant heat can be insulated by the air layer in the space P. Thereby, the thermal influence with respect to the main body 4 can be avoided as much as possible, and thermal durability can be improved.

  By inserting and fitting the main body 4 as described above, not only the mounting of the main body 4 to the bracket 2 but also the conductive connection of the high voltage output terminal 45 to the high voltage input terminal 322 and the plate-like terminal 271 of the ground side connection terminal 46. And the engagement of the projection 43 of the projecting piece 44 with the engagement hole 25 are performed simultaneously with the above mounting. That is, the protruding piece 44, the high voltage output terminal 45 accommodated in the cylindrical cover 48, and the ground side connection terminal 46 protrude from the predetermined position of the left side surface 412 of the housing 41 of the main body 4 to the left side. The predetermined position referred to here is a state in which the housing 41 is mounted on the mounting portion 24, and the protruding portion 44 is in contact with the rear surface of the flange piece 28 and the convex portion 43 is fitted into the engaging hole 25 to be engaged. Therefore, the high voltage force terminal 45 is positioned coaxially opposite to the high voltage input terminal 322 in the Z-axis direction. In addition, the plate-like terminal 271 is connected to the ground side connection terminal with respect to the Z-axis direction. Each position is located between a pair of elastic band plates 461 and 461 (see FIG. 5) constituting the 46. By setting the position in this manner, the main body 4 as described above is inserted into and fitted into the bracket 2, so that the high voltage output terminal 45 and the high voltage input terminal 322 are electrically connected, and the ground side connection terminal 46 and the plate are connected. The conductive connection with the terminal 271 and the engagement between the convex portion 43 and the engagement hole 25 are completed at the same time when the main body 4 is mounted on the bracket 2 and integrated with each other.

  The convex portion 43, the high voltage output terminal 45, and the ground side connection terminal 46 will be described in detail. The convex portion 43 and the protruding piece 44 are preferably formed of a material capable of exhibiting an elastic restoring force. May be molded integrally with synthetic resin, or may be formed separately from a synthetic resin or the like and bonded to the housing 41. The convex portion 43 has a slope on the left side and a step on the right side. When the convex portion 43 is fitted into the engagement hole 25, the step is engaged with the hole edge of the engagement hole 25. That is, the main body 4 is positioned in the Z-axis direction with respect to the bracket 2 by the engagement, and once engaged, the differential movement of the main body 4 to the right side is prevented and the main body 4 functions as a retainer. ing. Further, if the projecting piece 44 exerts an elastic restoring force, the elastic restoring force acts on the flange piece 28 by being submerged in the rear surface side of the flange piece 28, so that the body 4 is integrated with the bracket 2. Can be made stronger.

  Further, as shown in FIG. 8, the high voltage output terminal 45 is constituted by a cylindrical terminal whose tip 451 opens in a trumpet shape or a funnel shape and receives the rod-shaped high voltage input terminal 322. And the cylindrical cover 48 accommodates this high voltage output terminal 45 inside, and shields all or one part. In this embodiment, the cylindrical cover 48 has a semicircular cross-sectional shape at the tip 481, and a left and right predetermined range portion 482 including the tip 451 of the high voltage output terminal 45 has a circular cross-sectional shape. It is shown. That is, at least the tip 451 of the high voltage output terminal 45 is shielded. Thereby, in particular, the occurrence of electric leakage due to spark leak or the like from the tip 451 to the burner case 13 is prevented. In addition, the inner surface 483 of the cylindrical cover 48 up to the tip 451 is formed in a funnel shape so as to gradually change from a large diameter to a small diameter and reach the tip 451. Thereby, when the main body 4 is inserted and fitted, the insertion of the high voltage input terminal 322 into the high voltage output terminal 45 can be reliably guided.

  Further, the ground side connection terminal 46 is formed by overlapping the pair of elastic strips 461 and 461 as described above, and the protruding end portions of both elastic strips 461 for guiding when the plate-like terminal 271 enters. Are bent to open outward. And as a result of the plate-like terminal 271 breaking in between the pair of elastic strips 461 and 461 by the above-described insertion and fitting operation, the plate-like terminal 271 has a pair of elastic strips 461 in a state where an elastic restoring force is applied. It will be firmly sandwiched between 461.

  In order to attach the above ignition device G to the combustion device F, first, the bracket 2 is attached to the burner case 13 with screws 21 and 21 while the ignition plug 3 is held by the holding portion 23 of the bracket 2. At this time, the spark plug 3 is disposed through the through hole 132 and the packing 5 is sandwiched therebetween. Next, if the main body 4 is attached to the mounting portion 24 of the bracket 2 by insertion fitting, the main body 4 and the bracket 2 are integrated based on the mounting mechanism and the locking mechanism, the high voltage output terminal 45 and the high voltage input. All of the conductive connection with the terminal 322 and the conductive connection between the ground side connection terminal 46 and the plate-like terminal 271 can be completed simultaneously by one work operation. That is, by one assembling operation called insertion fitting, the main body 4 and the bracket 2 are integrated, the conductive connection between the high voltage output terminal and the high voltage input terminal, and the conductive connection between the ground side connection terminal and the plate-like terminal. Both connections can be completed.

<Other embodiments>
In addition, this invention is not limited to the said embodiment, Other various embodiment is included. That is, the central clamping piece 241 in the above embodiment mainly performs heat insulation and heat insulation of the housing 41, and is not essential in the mounting mechanism. This is because both the outer clamping pieces 242 and 242 mainly play a role of guiding and maintaining the position in the mounting and assembling operations. On the contrary, the mounting mechanism can be configured by only the central sandwiching piece 241 while omitting the outer sandwiching pieces 242 and 242. In this case, a concave groove may be formed so as to open to the opposite side of each guide rail 42, and both side edges of the center clamping piece may enter the concave groove.

  The conductive connection between the high voltage output terminal 45 and the high voltage input terminal 322 and the conductive connection between the ground side connection terminal 46 and the plate-like terminal 271 in the above embodiment are limited to the connection types illustrated in the drawings. is not. In other words, any connection type may be used as long as the conductive connections are made by inserting the main body 4 from the Z-axis direction.

It is a disassembled perspective view in the case of attaching embodiment of this invention to a combustion apparatus. It is a disassembled perspective view of the ignition device of embodiment. It is a perspective view of the state which assembled and integrated the ignition device of FIG. It is a partial top view at the time of attaching an ignition device to the combustion apparatus of FIG. It is the perspective view which looked at the rear surface of the main body from the top. It is an expanded sectional explanatory view in the AA line of FIG. FIG. 7 is a cross-sectional explanatory view taken along line BB in FIG. 6. It is an expanded sectional explanatory view in the CC line of FIG.

Explanation of symbols

2 Bracket 3 Spark plug 4 Body 11 Combustion burner (Ignition target)
13 Burner case (partition wall)
25 Engagement hole (recess; locking mechanism)
41 Housing 42 Guide rail (mounting mechanism)
43 Convex (locking mechanism)
44 Projection piece (locking mechanism)
45 High voltage output terminal 46 Ground side connection terminal 48 Cylindrical cover 241 Center clamping piece (Nipping piece; mounting mechanism)
242 Outer pinching piece (pinching piece; mounting mechanism)
271 Plate terminal 321 Discharge electrode part 322 High voltage input terminal 421 Concave groove (mounting mechanism)
451 Tip (tip opening)
461 Elastic strip 483 Inner surface F of cylindrical cover F Combustion device G Ignition device P Space

Claims (9)

A bracket that is fixed to a partition wall that forms a part of the ignition target, a spark plug that is held by the bracket so as to penetrate the partition wall, and that ignites the ignition target by spark discharge, and a spark discharge height inside the housing. A main body that accommodates the voltage output unit and is attached to the bracket;
The bracket is formed of a conductive material so as to constitute a part of the ground side circuit from the ignition target that has received the spark discharge together with the partition wall,
The spark plug protrudes to a position in the vicinity of the ignition target so that the discharge electrode portion on the front end side can discharge a spark discharge to the ignition target at one position across the bracket, while a high voltage input terminal on the base end side Is held by the bracket so that it protrudes in a predetermined direction at the other side position across the bracket,
The main body includes a high voltage output terminal that is connected to the high voltage output portion and protrudes outward, and a ground side connection terminal that protrudes in the same direction and in parallel with the high voltage output terminal,
The main body housing and the bracket are electrically connected to the high voltage input terminal by inserting the main body into the bracket in the protruding direction of the high voltage output terminal and the ground side connection terminal. An ignition device characterized in that a mounting mechanism for inserting and guiding and holding in a conductive connection state is integrally formed so that the connection and the conductive connection of the ground side connection terminal to the bracket are performed together. The ignition device according to claim 1,
The housing and the bracket of the main body are integrally formed with a lock mechanism that locks in a state of being mounted by the mounting mechanism.
The lock mechanism is formed on one of the housing and the bracket of the main body and protrudes in a direction orthogonal to the direction of the insertion fitting, and is formed on the other from the direction in which the protrusion is orthogonal. A concave portion to be inserted, and the convex portion and the concave portion are formed in a state in which the convex portion reaches a fitting position into the concave portion by the insertion fitting and the main body is attached to the bracket by the mounting mechanism. The ignition device is arranged so as to be fitted in the recess. The ignition device according to claim 2,
The concave portion is formed by an engagement hole formed through the bracket, and the convex portion is formed on a distal end side of a protruding piece that extends from the housing of the main body in the same direction as the high voltage output terminal and protrudes. The ignition device, wherein the piece is configured to allow an elastic pressing force to act on a direction in which the convex portion is fitted into the engagement hole. The ignition device according to claim 1,
The mounting mechanism includes a guide rail formed so as to protrude from the outer surface of the housing of the main body and extend parallel to the insertion fitting direction, and the insertion portion along the outer surface of the housing with the guide rail interposed therebetween. An ignition device comprising: a clip piece formed on the bracket so as to slide in the fitting direction. The ignition device according to claim 4,
The guide rail is a concave groove that opens in a side surface of the guide rail and extends in a straight line along the guide rail, and an end edge that extends in the insertion fitting direction in the clamping piece is fitted in the guide rail. An ignition device in which a concave groove is formed. The ignition device according to claim 4 or 5, wherein
Two guide rails are formed on the housing of the main body, while the bracket has a central clamping piece that enters between the two guide rails, and two guide rails that are disposed on the outer sides of the two guide rails. An outer pinching piece is formed,
The central clamping piece is configured so that the guide rail is clamped between each outer clamping piece in a state in which the main body is mounted on the bracket and apart from the outer surface of the housing with a space between them. An ignition device disposed. The ignition device according to claim 1,
The high voltage output terminal is an ignition device housed in a cylindrical cover that protrudes from the housing of the main body and opens at the tip. The ignition device according to claim 7, wherein
The high-voltage input terminal is formed in a rod shape, while the high-voltage output terminal has a tip opening that receives the rod-shaped high-voltage input terminal by insertion fitting of the main body,
The inner surface of the cylindrical cover is formed in a funnel shape so that the diameter gradually decreases from a portion opened with a larger diameter than the tip opening of the high voltage output terminal to the tip opening of the high voltage output terminal. , Ignition device. The ignition device according to claim 1,
The ground-side connection terminal is composed of two elastic band plates that are overlapped with each other and bent so that projecting end portions are opened to the outside, while the bracket extends in the insertion fitting direction. An ignition device in which a plate-like terminal sandwiched between the two elastic band plates is integrally formed by the insertion fitting.

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