JP5561538B2 - Combustion device - Google Patents

Description

  The present invention relates to a combustion apparatus that detects liquid fuel leakage using a liquid fuel sensor.

  Even now that city gas and propane gas have become widespread, in order to reduce running costs and the like, combustion apparatuses that use inexpensive liquid fuel such as kerosene are frequently used. Some combustion apparatuses using such liquid fuel incorporate a sensor inside the apparatus to detect fuel leakage, and perform a notification operation or a combustion operation interruption based on the detected information.

  As a combustion apparatus capable of performing such leak detection, a combustion apparatus proposed by the present applicant is disclosed in Patent Document 1. This Patent Document 1 exemplifies a configuration in which a combustion device is built in a hot water supply device, a fuel reservoir is provided in a bottom plate portion of a box of the hot water heater, and a liquid fuel sensor is fixed to the fuel reservoir with a screw. Yes.

  In the hot water supply apparatus exemplified in Patent Document 1, a fuel reservoir is provided in the bottom plate portion located at the lowermost part inside the hot water supply apparatus. In other words, the portion where the liquid fuel of the combustion apparatus may leak, that is, the fuel pipe connection portion and the fuel system member on the fuel supply path are all located above the fuel reservoir portion. Therefore, no matter which part of the combustion device the liquid fuel leaks, the leaked liquid fuel can be introduced into the fuel reservoir simply by dripping it according to gravity, so the leaked liquid fuel can be introduced into the fuel reservoir with a simple configuration. Can be introduced.

JP 2005-98873 A

By the way, the detection of leakage performed by the combustion apparatus is required to be performed accurately in a short time from the viewpoint of avoiding danger when liquid fuel leaks.
In view of this, the present inventors have considered a configuration in which a fuel reservoir portion provided with a liquid fuel sensor is formed on a tray, and the tray is disposed immediately below a portion of the combustion apparatus where liquid fuel may leak.
According to this configuration, since the position where the liquid fuel leakage occurs is close to the position of the liquid fuel sensor, the liquid fuel leaked when the liquid fuel leakage occurs quickly reaches the liquid fuel sensor. As a result, leakage of liquid fuel can be detected in a short time.
Further, according to this configuration, the position where the leakage of the liquid fuel occurs and the position of the fuel reservoir are close, and there are no or few members positioned between them, so that the leaked liquid fuel is more reliably dropped into the fuel reservoir. Can be made. For this reason, since the leaked liquid fuel reliably reaches the liquid fuel sensor without flowing out of the fuel reservoir, it is possible to accurately detect the leakage of the liquid fuel.

However, in view of the above-described configuration, a large number of members are arranged near the portion where the liquid fuel of the combustion apparatus may leak, and a large space cannot be secured around the position where the liquid fuel sensor is disposed. There is. Therefore, when the liquid fuel sensor is screwed to the fuel reservoir portion as in the prior art, there is a problem that a space necessary for the attachment / detachment operation cannot be secured and the attachment / detachment operation becomes difficult.
Furthermore, if a screw hole is made in the fuel reservoir as in the prior art, liquid fuel may leak downward from the screw hole. Here, a device such as a combustor in which a serious accident may occur due to the leaked liquid fuel may be located below the portion of the combustion device where the liquid fuel may leak. Therefore, it is necessary to mount the liquid fuel sensor in a state where the fuel reservoir portion maintains high liquid tightness.

  Therefore, the present invention pays attention to the above-mentioned problems of the prior art, and even if the installation position of the liquid fuel sensor is a narrow space with little space around it, the liquid fuel sensor can be easily attached and detached. It is an object of the present invention to provide a fuel device that can ensure high liquid tightness.

The invention according to claim 1 for solving the above-mentioned problem is a combustion apparatus that is housed in a box and has a fuel supply means for supplying liquid fuel to the combustion section and the combustion section, and a liquid fuel sensor, the tray is a interior of the box body are arranged from the bottom portion of the box body at a position apart upward, it includes a bottom portion and a top plate portion and a vertical wall portion, the leaked liquid When the fuel is introduced into the tray, the liquid fuel reaches the liquid fuel sensor before being discharged from the portion surrounded by the standing wall portion, and a through hole and a slit are formed on the bottom surface portion. The bottom surface portion and the upper plate portion are attached in a state where at least a part is separated, and a gap can be formed between the bottom surface portion and the upper plate portion or is always formed, and the gap is formed by the standing wall portion. Formed in the enclosed part , Whereas be one having an opening end is opened, the liquid fuel sensor or the liquid fuel sensor near member has a fixing portion, the fixing portion from the opening between the bottom and the upper plate portion The combustion apparatus is characterized by being insertable.

In the combustion apparatus of the present invention, the liquid fuel sensor or its peripheral member fixing part is slid under the upper plate part from the lateral side (opening) with respect to the gap formed between the bottom surface part and the upper plate part. The liquid fuel sensor can be attached to the tray. Therefore, the space required for the mounting operation of the liquid fuel sensor is arranged in such a manner that the liquid fuel sensor fixing portion is in contact with the side surface of the bottom surface portion and the upper plate portion, and the liquid fuel sensor is located at the arrangement position. Only a space for pressing from the side is required, and they do not require a wide open space. In other words, it is only necessary to secure a slight space enough to slide the liquid fuel sensor to the side of the liquid fuel sensor installation position, and there is a wide open space above the liquid fuel sensor installation position, such as screwing. It is never necessary. That is, the liquid fuel sensor can be easily attached even if a wide space cannot be secured around the position where the liquid fuel sensor is installed.
Further, unlike the attachment by screwing or the like, the attachment / detachment work is easy because the liquid fuel sensor can be attached / detached from the tray simply by sliding. This can simplify the replacement work of the liquid fuel sensor during maintenance or the like.
Furthermore, since the fixing portion of the liquid fuel sensor is sandwiched and fixed between the bottom surface portion and the upper plate portion, there is no need to form holes or grooves such as screw holes in the tray. Therefore, the liquid fuel does not leak from a hole or the like provided in the tray.

  According to a second aspect of the present invention, a first fitting portion is formed in the liquid fuel sensor or a peripheral member of the liquid fuel sensor, and the tray is paired with the first fitting portion. The first fitting portion and the second fitting portion are fitted, and the liquid fuel sensor is prevented from moving toward the opening side. The combustion apparatus according to claim 1.

  According to this configuration, the liquid fuel sensor can be made difficult to come off from the tray. More specifically, in order to remove the liquid fuel sensor from the tray, the fixing portion of the liquid fuel sensor must be moved to the outside through a gap between the bottom surface portion and the upper plate portion. At this time, the fixed part of the liquid fuel sensor comes out from the opening of the gap, but in the present invention, the fixed part moves to the opening side when the fixed part of the liquid fuel sensor is in the gap. Can be blocked. Further, it is possible to make it difficult to move the fixed portion to the opening side. Therefore, the liquid fuel sensor is hard to come off and can be attached more firmly.

  The invention according to claim 3 is characterized in that one of the first fitting portion and the second fitting portion is a through hole and the other is a hemispherical protrusion. It is a combustion apparatus of description.

  According to this configuration, when the fixed portion of the liquid fuel sensor is slid from the lateral side to below the upper plate portion, the protrusion and the fixed portion can be brought into point contact. As a result, the frictional force between the protrusion and the fixed portion can be reduced, so that the liquid fuel sensor can be easily slid.

  According to a fourth aspect of the present invention, the bottom surface portion of the tray has a high position portion and a low position portion that is lower than the high position portion and is continuous with the high position portion, and the upper plate portion. 4. The combustion apparatus according to claim 1, wherein the combustion apparatus is a flat plate and is attached to a high position portion to form the gap with a low position portion.

  According to this configuration, the liquid fuel sensor can be attached by placing the liquid fuel sensor in a low position portion that is recessed from the periphery and then sliding the liquid fuel sensor. Therefore, even when there is no large space due to a large member disposed on the upper portion of the tray, a space necessary for the sliding movement of the liquid fuel sensor can be easily secured.

  According to a fifth aspect of the present invention, the liquid fuel sensor has two fixing portions, and the two fixing portions are flat plate members protruding in directions away from each other, and a part of the fixing portion is The combustion apparatus according to any one of claims 1 to 4, wherein the combustion apparatus can be inserted between a bottom surface portion and an upper plate portion.

  According to this configuration, since the fixing portion is thin and flat, the liquid fuel sensor can be easily inserted between the bottom surface portion and the upper plate portion when the liquid fuel sensor is slid. Moreover, since the liquid fuel sensor can be stopped at two points, the liquid fuel sensor can be attached more firmly.

  According to a sixth aspect of the present invention, the upper plate portion includes a pressing piece, and the pressing piece presses the liquid fuel sensor in a state where the first fitting portion and the second fitting portion are fitted. The combustion apparatus according to any one of claims 2 to 5, wherein

  According to such a configuration, a gap is formed between the first fitting portion and the second fitting portion in a state in which the fitting portion and the fixing portion are displaced due to a dimensional shift or the like. Also, when the pressing piece presses the liquid fuel sensor, the first fitting portion formed in the liquid fuel sensor is pressed against the second fitting portion. Therefore, the state in which the first fitting portion and the second fitting portion are partly in contact can be maintained, and wobbling when the liquid fuel sensor is attached can be prevented.

Since the liquid fuel sensor can be detached from the tray by simply sliding the fixing portion of the liquid fuel sensor under the upper plate from the side, the liquid fuel sensor can be secured even if a wide space cannot be secured around the installation position of the liquid fuel sensor. Can be easily installed. Further, there is an effect that the attaching / detaching work can be easily performed.
In addition, since the present invention does not form a screw hole or the like for mounting the liquid fuel sensor, the liquid fuel does not leak from the hole or the like provided in the tray, and the tray can maintain high liquid tightness. .

It is a front view of the hot-water supply apparatus incorporating the combustion apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the tray employ | adopted with the combustion apparatus of FIG. 1, (a) shows the perspective view of the whole tray, (b) is AA sectional drawing of (a), (c) is (a) It is BB sectional drawing of). It is a front view which shows the tray employ | adopted with the combustion apparatus of FIG. It is a perspective view which shows the liquid fuel sensor employ | adopted with the combustion apparatus of FIG. It is a disassembled perspective view of the liquid fuel sensor of FIG. It is a perspective view which shows the tray and liquid fuel sensor which are employ | adopted with the combustion apparatus of FIG. 1, and shows the state which attached the liquid fuel sensor to the tray. It is a perspective view which shows the attachment member of FIG. It is the front view which looked at the attachment member of FIG. 7 from the A direction. It is a perspective view explaining a mode that an attachment member is attached to a tray. It is a perspective view explaining a mode that a liquid fuel sensor is attached to the tray to which the attachment member was attached. It is a partially expanded perspective view of A part of FIG. FIG. 7 is a partially enlarged perspective view of FIG. 6 viewed from the A direction. It is a circuit diagram which shows an example of the fuel supply circuit of the combustion apparatus of FIG. It is the perspective view which expanded the A section of the combustion apparatus of FIG. It is a perspective view explaining a mode that the liquid fuel which leaked to the tray flows in, and a liquid fuel flows in order of (a) and (b). It is a perspective view explaining a mode that the liquid fuel which leaked to the tray flows in succession to FIG. 15, and liquid fuel flows in order of (c)-(e). It is explanatory drawing which shows the liquid fuel sensor and tray of a form different from FIG. 6, and is an explanatory view which shows a mode that an attachment member is attached to a tray. It is explanatory drawing which shows the liquid fuel sensor and tray of a form different from FIG.6 and FIG.17, and is explanatory drawing which shows a mode that an attachment member is attached to a tray. It is explanatory drawing which shows the liquid fuel sensor and tray of a form different from FIG.6,17,18, and is explanatory drawing which shows a mode that an attachment member is attached to a tray.

  Hereinafter, although embodiment of this invention is described in detail, this invention is not limited to these examples. For example, although the following description demonstrates the example which incorporates the combustion apparatus 1 in the hot water supply apparatus 2, it is natural that it is not essential to use the combustion apparatus 1 of this invention for a hot water supply apparatus.

  As shown in FIG. 1, the hot water supply device 2 is formed by housing each member including the combustion device 1 inside a rectangular box 64, and heats the water supplied through the water supply port 65, This is a device having a function of sending hot water of a predetermined temperature from the hot water supply port 66.

  The combustion apparatus 1 includes a burner (combustion unit) 4, a fuel supply means 5, a fan 6, a tray 7, and a liquid fuel sensor 8.

  The burner 4 is a known gun type burner, and burns liquid fuel sprayed under pressure (using kerosene in this embodiment). Moreover, the burner 4 of this embodiment is what is called a reverse combustion type, and injects a flame toward the downward direction.

  The fuel supply means 5 is mainly formed by a flow control valve unit 10, an electromagnetic pump 11, a fuel supply pipe 12, and a fuel circulation pipe 13, and supplies liquid fuel to the burner 4.

  The fan 6 is a known blower and sends combustion air into the burner 4.

The tray 7 is a characteristic component of the present invention and will be described in detail below.
As shown in FIGS. 2 and 3, the tray 7 is a square plate-like member in which the edge portion of the bottom surface portion 18 is surrounded by the standing wall portion 20, and has a substantially rectangular shape when viewed from the front (FIG. 3).
When attention is paid to the bottom surface portion 18, a first fuel reservoir portion 21, a second fuel reservoir portion 22, and a third fuel reservoir portion 23, which are three concave portions having different shapes, are formed on the bottom surface portion 18, respectively. And a high position portion 19 that is higher than the recess. A protrusion 24 is provided on a part of the high position portion 19.
Further, when paying attention to the standing wall portion 20, a discharge portion 25 that connects the portion surrounded by the standing wall portion 20 of the tray 7 and the outside is provided in a part thereof.

  As shown in FIGS. 2 and 3, the first fuel reservoir portion 21 is formed by recessing a part of the bottom surface portion 18 into a substantially diamond shape. In the first fuel reservoir portion 21, an edge portion 71 continuous with the high position portion 19 is rounded, and the edge portion 71 is continuously continuous with the periphery.

As shown in FIGS. 2 and 3, the second fuel reservoir portion 22 is a groove-shaped portion having a substantially semicircular cross section formed by recessing a part of the bottom surface portion 18. It extends in a gentle S shape from the vicinity of one end in the X direction in FIG. 2 to the vicinity of the other end. Specifically, a central portion 22a extending along the longitudinal direction (X direction in FIG. 2) of the tray 7 and a direction inclined from both ends of the central portion 22a with respect to the extending direction of the central portion 22a (X direction in FIG. 2). Formed by extending end portions 22b, 22c. These end portions 22b and 22c are substantially parallel to each other and extend in directions away from each other.
At this time, the end portion 22b on one side of the second fuel reservoir 22 has a rounded end portion 76 in the extending direction (FIG. 3).
Further, in the other end portion 22 c of the second fuel reservoir portion 22, the end portion at a position away from the central portion 22 a is continuous with the third fuel reservoir portion 23. A raised portion 26 is formed at a portion continuous with the third fuel reservoir portion 23, and the raised portion 26 is gently raised with respect to the other bottom portion of the second fuel reservoir portion 22, It has become a mountain.
In the entire second fuel reservoir portion 22, the edge portion 77 continuous with the high position portion 19 is rounded, and the edge portion is continuously continuous with the periphery.

As shown in FIGS. 2 and 3, the third fuel reservoir portion 23 is formed by recessing a part of the bottom surface portion 18 so that the shape is substantially T-shaped. 2 The edge portion 80 that is continuous with the fuel reservoir 22 is rounded. The edge portion 80 is smoothly continuous with the periphery. In addition, two middle stage portions (low position portions) 27 are formed in the third fuel reservoir portion 23.
The middle portion 27 is formed by raising a part of the bottom portion of the third fuel reservoir 23 in a substantially rectangular parallelepiped shape. At this time, the top surface of the middle portion 27 is at a position higher than the other portions of the third fuel reservoir 23 and is lower than the high position portion 19. In addition, the edge portion 81 of the middle stage portion 27, that is, the portion continuing to the high position portion 19 and the other bottom portion of the third fuel reservoir portion 23 is also rounded, and the edge portion 81 is gently around the periphery. It is continuous.

  The protruding portion 24 is a protrusion in which a part of the bottom surface portion 18 protrudes in a hemispherical shape.

  As shown in FIGS. 2 and 3, the discharge portion 25 is a so-called semi-cylindrical portion obtained by cutting the cylinder in half along a plane parallel to the longitudinal direction, and protrudes outward from the standing wall portion 20 in the horizontal direction. In order to do so, it is provided integrally with the standing wall portion 20. At this time, the discharge part 25 is provided so that the upper side is opened, and the cross-sectional shape is like a semicircular groove. And the outside and inside of standing wall part 20 are connected.

  Here, the positional relationship between the three recesses of the first fuel reservoir portion 21, the second fuel reservoir portion 22, and the third fuel reservoir portion 23 and the discharge portion 25 will be described in detail with reference to FIG.

  The first fuel reservoir portion 21 is located at a corner portion (the end portion in the longitudinal direction and the short direction of the tray 7) in the bottom surface portion 18 of the tray 7, and one half of the outer periphery is in a position in contact with the standing wall portion 20. . Here, the other half of the outer periphery of the first fuel reservoir portion 21 and located at a position away from the standing wall portion 20 is substantially perpendicular to the longitudinal direction of the tray 7 (X direction in FIG. 3). Are formed by a first portion 21a extending in the direction and a second portion 21b extending in a direction inclined with respect to the first portion 21a. The second portion 21 b is close to the end portion 22 c of the second fuel reservoir portion 22.

At this time, the extending directions of the second portion 21 b of the first fuel reservoir 21 and the end portion 22 c of the second fuel reservoir 22 are substantially parallel. In other words, the end portion 22 c of the second fuel reservoir portion 22 extends along a part of the outer periphery of the first fuel reservoir portion 21. As described above, the end portion 22 c of the second fuel reservoir 22 is continuous with the third fuel reservoir 23.
The third fuel reservoir 23 is located at a corner of the bottom surface 18 of the tray 7 and adjacent to the corner where the first fuel reservoir 21 is located. Specifically, the corner portion where the first fuel reservoir 21 is located and the position of the tray 7 in the longitudinal direction (X direction in FIG. 3) are substantially the same, and the short direction (the direction orthogonal to the X direction in FIG. 3). Are located at different corners. Moreover, the discharge | release part 25 is formed in this corner | angular part.

  Further, at this time, as shown in FIG. 2, the depths of the first fuel reservoir 21 and the second fuel reservoir 22 are substantially the same, or the bottom portion of the first fuel reservoir 21 is the second fuel reservoir. It is formed so as to be slightly lower than the bottom portion of the portion 22. Further, the bottom portion of the third fuel reservoir portion 23, that is, the portion excluding the middle portion 27 of the third fuel reservoir portion 23 is located lower than the bottom portions of the first fuel reservoir portion 21 and the second fuel reservoir portion 22. . In other words, the third fuel reservoir 23 is deepest among the three recesses of the first fuel reservoir 21, the second fuel reservoir 22, and the third fuel reservoir 23.

  As shown in FIG. 4, the liquid fuel sensor 8 is a sensor including a fuel detection mechanism 28 that detects the presence or absence of liquid fuel at the lower portion of the installation position.

  As shown in FIGS. 4 and 5, the fuel detection mechanism 28 includes an expansion member 30, a relay member 31, and a detection switch 32 that are fixed inside the frame member 29.

  As shown in FIGS. 4 and 5, the frame member 29 is a substantially rectangular cylindrical member surrounded by four wall portions, and is manufactured by press-molding a pierced metal plate. A fixing portion 35 is provided on each of the lower edges of the two wall portions that are opposed to each other among the four wall portions. And the support part 36 is provided in the upper edge of two wall parts in which the fixing | fixed part 35 is not provided.

  The fixed portion 35 is a substantially rectangular flat plate-like member, and protrudes outward from the wall portion in the horizontal direction. And the through-hole (1st fitting part) 37 which penetrates a top | upper surface and a bottom face is provided in the protrusion front end side. The central axis of the through hole 37 extends in a direction perpendicular to the protruding direction of the fixed portion 35. At this time, the corner portion on the protruding front end side of the fixing portion 35 is cut off, which is a so-called corner cutting angle.

  4 and 5, the expansion member 30 includes a bottomed cylindrical housing portion 40 having a flange portion at one end, an expansion portion 41 disposed inside the housing portion 40, and a pressure receiving movement portion 42. Is formed by. The expanding portion 41 is arranged so that the peripheral surface thereof is in contact with the inner peripheral wall of the housing portion 40.

  The housing part 40 is made by sintering and molding a polypropylene resin particle material. The sintered and molded housing portion 40 is a porous body in which countless holes having an average diameter of about 50 μm are formed throughout, and has water repellency and lipophilicity.

  The expansion part 41 is a cylindrical member made by molding silicone rubber, and has the property of absorbing kerosene and expanding.

  The pressure receiving moving part 42 is a substantially disk-shaped member manufactured by molding a synthetic resin material, and the periphery thereof has a rounded shape.

  As shown in FIGS. 4 and 5, the relay member 31 is inserted into and attached to a through hole provided in the base 45 of the detection switch 32. When a pressing force is applied from below, the relay member 31 is attached to the through hole. It can move relatively upward.

  4 and 5, the detection switch 32 is a general-purpose micro switch having a substantially rectangular parallelepiped shape, and a small pressing piece (not shown) is provided protruding downward in the center of the lower surface. A signal can be generated by pressing the pressing piece from the lower side (Y direction lower side in FIG. 4) with the relay member 31.

  As shown in FIG. 6, the liquid fuel sensor 8 is used in a state of being attached to the tray 7 via an attachment member (upper plate portion) 50. The attachment member 50 will be described.

As shown in FIG. 7, the attachment member 50 is a plate-like member whose outer shape is formed by processing an elastic material such as a spring plate. A protrusion (pressing piece) 51 is formed at the center of the inner edge of the mounting member 50. In addition, each of the distal end portions 55 which are two distal ends facing each other is provided with a bent portion 52 at the most distal end portion. The bent portion 52 of the distal end portion 55 is closer to the main body portion 56 side (in the Z direction in FIG. 7). The protrusions (second fitting portions) 53 are provided at the positions on the side. Two through holes 54 are formed in the main body portion 56 of the attachment member 50, and these through holes 54 are provided so as to form a line with the bent portion 52 and the protruding portion 53, respectively.
Here, the two protrusions 53 and the two through holes 54 are arranged symmetrically in the longitudinal direction (X direction in FIG. 7) of the attachment member 50, respectively. It has become.

As shown in FIGS. 7 and 8, the protruding portion 51 is a part having a substantially trapezoidal outer shape, and is formed by bending a part of the attachment member 50. The projecting portion 51 is provided so as to project substantially vertically from the main body portion of the attachment member 50 upward in the vertical direction (Y direction in FIG. 7). Specifically, it protrudes in a direction slightly inclined from the upper side in the vertical direction to the direction away from the main body portion 56 (the front side in the Z direction in FIG. 7).
In addition, a central portion of the protruding portion 51 is provided with a through hole that penetrates a surface facing in the width direction (the direction perpendicular to the protruding direction and the Y direction in FIG. 7). The shape is trapezoidal.

  As shown in FIG. 7, the bent portion 52 bends the front end (front end in the Y direction in FIG. 7) of the mounting member 50 slightly upward (upward in the Y direction in FIG. 7) and rounds off the corner portion. Is formed.

  As shown in FIGS. 7 and 8, the protrusion 53 has a part of the top surface (upper surface in FIG. 7) of the mounting member 50 in a direction from the top surface to the bottom surface (lower side in the Y direction in FIGS. 7 and 8). It is a substantially hemispherical protrusion that protrudes from the bottom surface toward the lower side (the lower side in the Y direction in FIG. 8).

  As shown in FIG. 7, the through-hole 54 is a hole that penetrates from the top surface to the bottom surface of the mounting member 50.

  Next, an attachment method for attaching the liquid fuel sensor 8 to the tray 7 will be described in detail with reference to the drawings.

Prior to the mounting of the liquid fuel sensor 8, the mounting member 50 is mounted integrally on the tray 7 as shown in FIGS. Here, paying attention to the tray 7, the mounting member 50 is placed on the upper side of the bottom surface portion 18 of the tray 7 with the protrusion 24 of the tray 7 being inserted into the through hole 54 of the mounting member 50 (FIG. 10). reference). At this time, an appropriate portion of the attachment member 50 is fixed to the tray 7 by spot welding S, and the attachment member 50 is attached to the tray 7 integrally.
By inserting the protrusion 24 and the through hole 54 in this way, the fixing work is facilitated when spot welding S or the like is performed. That is, positioning before the fixing operation is easy, and displacement of the member during the fixing operation can be prevented.

Here, as shown in FIG. 10, most of the main body portion 56 of the attachment member 50 is in contact with the high position portion 19, and each of the two tip portions 55 extends from the high position portion 19 to the third fuel reservoir 23. It protrudes like a eaves to the middle stage portion 27 of the head. That is, the two tip portions 55 of the attachment member 50 are disposed so as to cover the respective middle stage portions 27 of the third fuel reservoir portion 23. Thus, gaps 60 are formed between the attachment member 50 and the two middle stage portions 27, respectively.
At this time, as shown in FIG. 11, the gap 60 formed between the attachment member 50 and the middle stage portion 27 is continuous with the outside by opening the distal end side (front side in FIG. 11) of the attachment member 50. Yes. At this time, a substantially rectangular surface (a surface surrounded by the attachment member 50, the middle step portion 27, and the two-dot chain line in FIG. 11) serving as a boundary between the gap 60 and the outside becomes the opening 59 of the gap 60.
At this time, the protrusion 53 of the attachment member 50 is located in the gap 60 and protrudes downward from the upper side (the Y direction upper side in FIG. 10) of the gap 60.
Further, the two middle stage portions 27 are located at a distance from each other, and a space is formed between them. In addition, the front end sides of the attachment members 50 are separated from each other, and a space is formed therebetween. Therefore, an accommodation space 61 is formed between the two gaps 60, the upper side (the Y direction upper side in FIG. 10) is opened, and the lower side is closed by the bottom portion of the third fuel reservoir 23.

  Next, the liquid fuel sensor 8 is attached to the tray 7 to which the attachment member 50 is attached. Specifically, as shown in FIGS. 9 and 10, the liquid fuel sensor 8 is slid from the distal end side (front side in FIG. 10) of the mounting member 50, and the distal end of the fixing portion 35 of the liquid fuel sensor 8 is opened 59. Fit into the gap 60. More specifically, at this time, a protrusion 53 (see FIGS. 8 and 10) that protrudes from the upper side (the Y direction upper side in FIG. 10) toward the lower side with the gap 60 is formed at the tip of the fixing portion 35 of the liquid fuel sensor 8. It fits so that it may be penetrated by the through-hole 37 (refer FIG. 10). As a result, the liquid fuel sensor 8 can be attached to the tray 7 so that the liquid fuel sensor 8 is positioned in the accommodation space 61.

  Here, the height of the gap 60 (the length in the Y direction in FIG. 10) is greater than the height of the fixing portion 35 of the liquid fuel sensor 8 (the thickness of the fixing portion 35 and the length in the Y direction in FIG. 10). Somewhat low is desirable. In this case, when the liquid fuel sensor 8 is attached (see FIG. 6), the attachment member 50, which is an elastic body, presses the liquid fuel sensor 8 from the upper side (upper side in the Y direction in FIG. 10). Can be attached strongly.

In the present embodiment, the protrusion 53 of the mounting member 50 protrudes in a hemispherical shape (see FIG. 8), so that the liquid fuel sensor 8 can be easily attached and detached. More specifically, when the liquid fuel sensor 8 is attached, the fixing portion 35 of the liquid fuel sensor 8 is slid from the outside into the gap 60 as described above (see FIG. 10). At this time, if the protruding portion 53 is hemispherical, it is possible to make point contact when the fixing portion 35 of the liquid fuel sensor 8 and the protruding portion 53 come into contact with each other. When the contact is made in this way, the protrusion 53 can be smoothly run on the upper surface of the fixing portion 35 by further sliding the fixing portion 35 of the liquid fuel sensor 8.
In addition, when the fixing portion 35 is further slid from this state (the state where the protruding portion 53 rides on the upper surface of the fixing portion 35), the contact area between the upper surface of the protruding portion 53 and the fixing portion 35 can be reduced. , Friction force can be reduced. As a result, when the liquid fuel sensor 8 is slid from the state in which the protruding portion 53 rides on the upper surface of the fixing portion 35 until the protruding portion 53 is dropped into the through hole 37 of the fixing portion 35, the sliding operation is easily performed. Can do.

When the liquid fuel sensor 8 is attached to the tray 7, the liquid fuel sensor 8 is positioned between the two tip portions 55 of the attachment member 50 as shown in FIG. 6. The lowermost part of the expansion member 30 of the liquid fuel sensor 8, that is, the lowermost part of the entire fuel detection mechanism 28 is located in the third fuel reservoir 23. At this time, the distal end portion of the fixing portion 35 of the liquid fuel sensor 8 is positioned below the distal end portion 55 of the attachment member 50 and is pressed from above by the distal end portion 55 of the attachment member 50. Further, the protrusion 53 of the attachment member 50 is located inside the through hole 37 (see FIG. 10) of the fixing portion 35.
Also, at this time, as shown in FIG. 12, one of the four wall portions of the frame member 29 is removed by the protruding portion 51 (see FIG. 7) of the mounting member 50 (the Z direction in FIG. 6). It is pressed to the front side.

  Here, it is desirable that the diameter of the through hole 37 of the fixing portion 35 and the diameter of the protrusion 53 of the mounting member 50 are substantially the same. If it does in this way, the wobble of the liquid fuel sensor 8 at the time of attachment can be prevented.

  However, in this embodiment, since the liquid fuel sensor 8 is pressed by the protruding portion 51 of the mounting member 50, the diameter of the through hole 37 of the fixing portion 35 is slightly larger than the diameter of the protruding portion 53 of the mounting member 50. Even so, the wobble of the liquid fuel sensor 8 at the time of attachment can be suppressed. More specifically, when the diameter of the through hole 37 of the fixing portion 35 is slightly larger than the diameter of the protruding portion 53 of the mounting member 50, the protruding portion 53 of the mounting member 50 is inserted into the through hole 37 of the fixing portion 35. However, the liquid sensor 8 is attached to the attachment member 50 in a state in which the liquid sensor 8 is relatively movable by a small distance in a direction other than the vertical direction (Y direction in FIG. 6). However, by pressing the liquid fuel sensor 8 with the protrusion 51, the state in which the protrusion 53 and the inner wall of the through hole 37 are in contact with each other can be maintained, so that the wobble of the liquid fuel sensor 8 at the time of attachment can be suppressed.

  In the present embodiment, since the liquid fuel sensor 8 can be attached to the tray 7 without providing a through hole such as a screw hole or a slit that cuts out the bottom surface portion 18, the liquid fuel introduced into the tray 7 can be reliably leaked. Can be prevented.

  Next, the operation of the combustion apparatus 1 of the present embodiment and the hot water supply apparatus 2 incorporating the combustion apparatus 1 will be described with reference to FIGS.

  In the combustion apparatus 1 of the present embodiment, the flow control valve unit 10, the electromagnetic pump 11, and the burner 4 are connected by members such as a fuel circulation pipe 13 to form a circulation circuit (see FIG. 13). Then, liquid fuel is supplied to the circulation circuit from the outside via the fuel supply pipe 12. The liquid fuel supplied from the outside circulates in the circulation circuit and is used by the burner 4.

  Here, in the present embodiment, liquid fuel is supplied from the electromagnetic pump 11 to the burner 4, and the return amount of the liquid fuel from the bypass nozzle (return nozzle) of the burner 4 to the electromagnetic pump 11 is controlled by the flow control valve unit 10, Adjust the flow rate and flow rate of the liquid fuel in the circulation circuit. Thereby, the supply amount per hour of the liquid fuel supplied to the burner 4 is adjusted.

  In the burner 4, a combustion gas is generated by burning a fuel gas obtained by mixing the supplied liquid fuel (kerosene) and the air supplied from the fan 6. The combustion gas generated in the combustion device 1 is heat-exchanged with water in the downstream heat exchanger 15, and the heated hot water is mixed with water and the temperature is adjusted, and then the hot water supply terminal 66 (not shown) is provided. Sent to The heat exchanged combustion gas passes through the silencer 16 as exhaust gas and is discharged from the exhaust head 17 to the outside.

  Here, the operation when the liquid fuel leaks from the fuel supply means 5 as the characteristic operation of the combustion apparatus 1 of the present embodiment will be described with reference to the drawings.

  First, in the combustion apparatus 1 of the present embodiment, a portion where fuel leakage may occur is considered. As shown in FIG. 14, the fuel supply pipe 12 for supplying fuel from the outside is connected to the flow rate control valve unit 10, the connection portion 68 between the flow rate control valve unit 10 and the electromagnetic pump 11, the flow rate. Various pipes such as the control valve unit 10 or the electromagnetic pump 11 and the burner 4 (not shown) and the fuel circulation pipe 13 connecting them may be cited as a portion where there is a risk of fuel leakage. In addition, the flow control valve unit 10 itself can be cited as a portion where there is a risk of fuel leakage.

  In the combustion apparatus 1 of the present embodiment, the tray 7 is disposed below the portion where there is a risk of fuel leakage.

  More specifically, as shown in FIG. 14, the flow control valve unit 10 and the electromagnetic pump 11 are placed adjacent to each other on the upper side of the tray 7, and each of them is a second fuel reservoir 22. It is provided so as to straddle another part. Further, the electromagnetic pump 11 is located at the end of the tray 7 in the longitudinal direction (X direction in FIG. 14) and away from the discharge portion 25. At this time, the fuel circulation pipe 13 protrudes from the upper part of the flow control valve unit 10, and the pipe connecting the electromagnetic pump 4 and the burner 4 protrudes from the upper part of the electromagnetic pump 11. These two pipes extend to the burner 4 (FIG. 1) located below the tray 7 while being bent in an appropriate direction. At this time, most of these pipes are located above the tray 7.

  Here, the flow control valve unit 10 has a cylindrical portion 83 which is a cylindrical portion. The cylindrical portion 83 extends toward the electromagnetic pump 11, and a portion in contact with the electromagnetic pump 11 is a connection portion 67 with the electromagnetic pump 11. At this time, the cylindrical portion 83 extends along the central portion 22 a of the second fuel reservoir portion 22, and the connection portion 67 is positioned on the upper side in the vertical direction of the second fuel reservoir portion 22.

  Further, the flow control valve unit 10 is connected to a fuel supply pipe 12 that is used when liquid fuel is supplied from the outside. A first fuel reservoir 21 extends below the connection 68 between the flow control valve unit 10 and the fuel supply pipe 12.

  The liquid fuel sensor 8 is near the corner where the discharge port 25 of the tray 7 is provided, and the liquid fuel sensor 8 is detachably attached at a position adjacent to a part of the flow control valve unit 10.

  In the present embodiment, the tray 7 extends below the portion where there is a risk of fuel leakage. Therefore, it is possible to reliably introduce the liquid fuel leaked from the portion where there is a risk of fuel leakage into the tray 7.

  In this embodiment, the liquid fuel sensor 8 is located near the corner of the tray 7 and is located on the side of the flow control valve unit 10 that is a large member. That is, the liquid fuel sensor 8 is provided in a narrow portion with little space around it. However, as described above, the liquid fuel sensor 8 can be attached to and detached from the tray 7 only by sliding in the lateral direction (the Z direction in FIG. 14). It is not necessary to carry out the installation work. Therefore, the attaching / detaching operation can be easily performed even in a narrow portion.

  Further, consider the case where maintenance is performed on these parts where there is a risk of fuel leakage. In general, maintenance often involves removing the piping, and liquid fuel may leak from the connecting portion between the piping and the device, such as the connecting portion 68, during this operation.

  In the combustion apparatus 1 of the present embodiment, the first fuel reservoir portion 21 is disposed below the connection portion 68 that is likely to cause leakage of liquid fuel during maintenance. Therefore, liquid fuel that leaks due to laying or maintenance can be introduced into the first fuel reservoir 21 of the tray 7.

  Here, the operation will be described by taking as an example a case where liquid fuel leaks from the connection portion 68.

  When the liquid fuel leaks from the connecting portion 68, the leaked liquid fuel stays in the first fuel reservoir portion 21 located immediately below the connecting portion 68, as shown in FIG. When the liquid fuel leaks beyond the maximum storage amount of the first fuel reservoir 21, the liquid fuel overflowing from the first fuel reservoir 21 is second fuel reservoir 22 as shown in FIG. It flows into.

  If the liquid fuel continues to leak in this state, the liquid fuel that has flowed into the second fuel reservoir 22 fills the second fuel reservoir 22 as shown in FIG. When the liquid fuel flowing into the second fuel reservoir 22 exceeds the maximum storage amount of the second fuel reservoir 22, the liquid fuel overflowing from the second fuel reservoir 22 flows into the third fuel reservoir 23. Go.

  If the leakage of the liquid fuel does not stop in this state, the liquid fuel fills the third fuel reservoir 23 as shown in FIG. That is, the liquid level in the third fuel reservoir 23 rises. When the liquid level in the third fuel reservoir 23 rises, the liquid fuel eventually comes into contact with the liquid fuel sensor 8 from below. Then, the liquid fuel sensor 8 senses the presence of the liquid fuel and transmits a signal notifying it.

  Thereafter, if the leakage does not stop, the tray 7 is filled with the leaked liquid fuel as shown in FIG. Then, the liquid fuel flows out from the discharge part 25 to the outside.

  In the present embodiment, the leaked liquid fuel does not enter the tray 7 by an amount sufficient to fill the first fuel reservoir 21 and the second fuel reservoir 22 and raise the liquid level of the third fuel reservoir 23 above a specified level. As long as the liquid fuel sensor 8 does not sense the leak. Therefore, the liquid fuel sensor 8 does not detect the leakage of the liquid fuel that has occurred due to laying or maintenance. Therefore, it is possible to reliably prevent malfunction due to a minute amount of leakage.

  In the present embodiment, the discharge portion 25 is located above the third fuel reservoir portion 23 where the liquid fuel sensor 8 is disposed. As a result, the liquid fuel introduced into the tray 7 does not contact the liquid fuel sensor 8 (below the fuel detection mechanism 28) and is not discarded to the outside. For this reason, if a specified amount of liquid fuel is introduced into the tray 7, leakage of the liquid fuel can always be detected.

  Furthermore, in this embodiment, when the liquid fuel is allowed to flow out from the tray 7, it can be discharged to an appropriate external location. Specifically, as shown in FIG. 14, by attaching a guide member 69 such as a rubber hose to the discharge part 25, the outflow destination of the liquid fuel can be appropriately changed.

In the above-described embodiment, the liquid fuel leaked from a portion where there is a risk of fuel leakage on the tray 7 is directly guided (dropped) into the tray 7, but the method of introducing the liquid fuel into the tray 7 is limited to this. It is not a thing. Another member may be interposed between the portion where the fuel leak has occurred and the tray 7. For example, for the members on the tray 7 such as the liquid fuel sensor 8, the flow control valve unit 10, the electromagnetic pump 11, the fuel supply pipe 12, and the fuel circulation pipe 13, some of them are band-like tying bands (not shown). It is possible to have a configuration in which a plurality of members are bundled by winding. Moreover, the structure which wound the strip | belt-shaped binding band (not shown) around attachment members, such as an electric cord extended from the member on these trays 7, and bound the some attachment member may be sufficient. Then, the configuration may be such that the leaked liquid fuel flows or drops into the binding band, and then the liquid fuel is guided from the binding band to the tray 7.
In addition, you may wind a strip | belt-shaped binding band not only to a some member (attachment member) but only to one member (attachment member). Further, the members on the tray 7 and the attached members belonging to them may be bound. At this time, an appropriate material such as a metal wire covered with vinyl is used for the band-like binding band.

  In the above-described embodiment, the double weir structure in which the two fuel reservoir portions of the first fuel reservoir portion 21, the second fuel reservoir portion 22, and the third fuel reservoir portion 23 are provided in the tray 7 is used. It does not matter. The shape, number, and position of the fuel reservoir formed on the tray 7 are not limited to this.

  For example, a weir surrounding the periphery without denting the bottom surface portion 18 of the tray 7 may be provided as a fuel reservoir portion. Further, a weir surrounding the periphery after the bottom surface portion 18 of the tray 7 is depressed may be provided as a fuel reservoir portion.

  Furthermore, a plurality of first fuel reservoirs formed below the place where fuel leakage is likely to occur may be provided. For example, the liquid fuel may be formed so that it can flow from the two first fuel reservoirs to the second fuel reservoir. Alternatively, the liquid fuel may flow directly from the first fuel reservoir to the third fuel reservoir without providing the second fuel reservoir. Furthermore, the structure which provides two or more 2nd fuel reservoir parts located between the 1st fuel reservoir part and the 3rd fuel reservoir part may be sufficient. In addition, a configuration in which only the first fuel reservoir portion is provided and the second fuel reservoir portion and the third fuel reservoir portion are not provided may be employed.

Furthermore, the tray 7 and the fuel reservoir may be installed at a location that is not below the fuel supply means 5. Any device that may cause fuel leakage may be provided below any device. At that time, the shape of the tray 7 and the shape and position of the fuel reservoir may be appropriately changed according to the shape of the device.
Further, the tray 7 may be arranged at a position away from the equipment that may cause fuel leakage. In other words, the liquid fuel may be introduced into the tray 7 through another member such as a funnel or a jar.

In the above-described embodiment, the through hole 37 is formed in the fixed portion 35 of the liquid fuel sensor 8 as the first fitting portion, and the protrusion 53 is formed in the mounting member 50 as the second fitting portion. The joint section is not limited to this.
For example, a protrusion is provided on the fixing portion 35 of the liquid fuel sensor 8 as the first fitting portion, and a through hole, a bottomed hole, a depression, or a groove that fits the protrusion on the mounting member 50 as the second fitting portion. The structure which forms etc. may be sufficient.
In addition, as shown in FIG. 17, a rectangular cut-and-raised portion is formed in the fixing portion 35 of the liquid fuel sensor 8 to form a first fitting portion 92, and a flat plate protruding substantially vertically from the standing wall portion 20 of the tray 7. The second fitting portion 93 may be formed by forming a bottomed hole having a square opening in the bottom portion of the upper plate portion 87.

Moreover, the structure which forms only one fitting part may be sufficient. For example, as shown in FIG. 18, a fitting portion 88 having a hook-like shape by bending a tip portion in the protruding direction with respect to a flat plate-like upper plate portion 87 protruding substantially vertically from the standing wall portion 20 of the tray 7. It is good also as a structure which does not provide a fitting part in the fixing | fixed part 35 of the liquid fuel sensor 8 formed.
Such a fitting portion 88 does not hinder the operation when the fixing portion 35 of the liquid fuel sensor 8 is inserted into the gap 60 from the opening 59, and the fixing portion 35 of the liquid fuel sensor 8 is moved from the gap 60 to the opening 59. When moving in the direction of heading, the engaging portion 88 abuts against the fixed portion 35 to prevent the movement.

  Furthermore, the structure which does not form a fitting part may be sufficient. For example, as shown in FIG. 19, the flat plate-like upper plate portion 98 having elasticity may be attached only by suppressing the plate-like fixing portion 99 of the liquid fuel sensor 8.

In the above-described embodiment, the middle portion 27 is formed as the low position portion on the bottom surface portion 18 of the tray 7 and the high position portion 19 and the low position portion are formed. However, the configuration of the bottom surface portion 18 of the tray 7 is not limited to this. is not.
For example, the intermediate portion 27 may not be formed on the bottom surface portion 18, and the depth of the third fuel reservoir portion 23 may be made shallower to form the gap 60 between the bottom surface portion 18 and the third fuel reservoir portion 23. .
Also, as shown in FIGS. 17 to 19, the bottom surface portion 18 may have a configuration with no height difference.

  In the above-described embodiment, the attachment member 50 is a member having a substantially C-shaped outer shape, but the shape and number of the attachment members 50 are not limited thereto. For example, it may be a rectangular flat plate member as shown in FIG. These may be changed as appropriate according to the shape of the tray 7, the shape of the fixing portion 35 of the liquid fuel sensor 8, members disposed around the liquid fuel sensor 8, and the like.

  Furthermore, in the above-described embodiment, a gap is formed between the attachment member 50 and the bottom surface portion 18 by directly attaching the attachment member 50 as the upper plate portion to the bottom surface portion 18 of the tray 7. And the structure which forms a clearance gap is not restricted to this. For example, as shown in FIGS. 17 and 18, a protruding portion that protrudes perpendicularly to the standing direction of the standing wall portion 20 is provided as the upper plate portion 87, and the upper plate portion 87 and the bottom surface portion 18 of the tray 7 are between. A gap for sandwiching the fixing portion 35 of the liquid fuel sensor 8 may be formed. That is, the upper plate portion 87 is attached to the bottom surface portion 18 via another portion (and member) between the upper plate portion 87 and the bottom surface portion 18, and a gap is formed between the upper plate portion 87 and the bottom surface portion 18. May be.

In the above-described embodiment, the gap 60 and the opening 59 are always formed between the mounting member 50 as the upper plate portion and the bottom surface portion 18 of the tray 7. However, even if the gap 60 and the opening 59 are not always formed. Good.
For example, as shown in FIG. 19, only one end portion of the upper plate portion 98 may be fixed by spot welding S, and the upper plate portion 98 may be attached to the bottom surface portion 18 of the tray 7 without unevenness. In this way, the upper plate portion 98 is in close contact with the bottom surface portion 18 when the liquid fuel sensor 8 is not attached, and no gap or opening is formed between the upper plate portion 98 and the bottom surface portion 18. When the liquid fuel sensor 8 is attached, one end (the side not fixed by the spot welding S) of the upper plate portion 98 is lifted, and a gap is formed between the upper plate portion 98 and the bottom surface portion 18. At the same time, the vicinity of the end portion on the raised side is an opening of the gap.
That is, the gap 60 and the opening 59 may be formed when the liquid fuel sensor 8 is attached or detached and when the liquid fuel sensor is attached to the tray 7.

1 Combustion device 4 Burner (combustion section)
DESCRIPTION OF SYMBOLS 5 Fuel supply means 7 Tray 8 Liquid fuel sensor 18 Bottom face part 19 High position part 35 Fixing part 37 Through-hole (1st fitting part)
50 Mounting member (upper plate)
51 Protrusion (Pressing piece)
53 Projection (second fitting part)
59 Opening 60 Clearance

Claims (6)

A combustion device housed inside a box and having a fuel supply means for supplying liquid fuel to the combustion part and the combustion part,
A tray and a liquid fuel sensor,
The tray is arranged inside the box and at a position away from the bottom of the box to the upper side,
It has a bottom part, an upper plate part and a standing wall part ,
When the leaked liquid fuel is introduced into the tray, the liquid fuel reaches the liquid fuel sensor before being discharged to the outside from the portion surrounded by the standing wall,
The bottom portion is one in which through holes and slits are not formed,
The bottom portion and the upper plate portion are attached in a state where at least a part is separated, and a gap can be formed between the bottom portion and the upper plate portion or is always formed.
The gap is formed in a portion surrounded by the standing wall, and has an opening that is open at one end,
The liquid fuel sensor or a peripheral member of the liquid fuel sensor has a fixed portion, and the fixed portion can be inserted from the opening between the bottom surface portion and the upper plate portion.   A first fitting portion is formed on the liquid fuel sensor or a peripheral member of the liquid fuel sensor, and a second fitting portion that is paired with the first fitting portion is formed on the tray. The combustion apparatus according to claim 1, wherein the first fitting portion and the second fitting portion are fitted to prevent movement of the liquid fuel sensor toward the opening side. .   The combustion apparatus according to claim 2, wherein one of the first fitting portion and the second fitting portion is a through hole, and the other is a hemispherical protrusion.   The bottom surface portion of the tray has a high position portion and a low position portion that is lower than the high position portion and is continuous with the high position portion, and the upper plate portion has a flat plate shape. The combustion apparatus according to any one of claims 1 to 3, wherein the gap is formed between the low position portion and the low position portion.   The liquid fuel sensor has two fixing portions, and the two fixing portions are flat members protruding in directions away from each other, and a part of the fixing portion is between the bottom surface portion and the upper plate portion. The combustion apparatus according to any one of claims 1 to 4, wherein the combustion apparatus is insertable.   The said upper board part is provided with a press piece, and the said press piece presses a liquid fuel sensor in the state which fitted the 1st fitting part and the 2nd fitting part. The combustion apparatus in any one.

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