JPH0730957B2 - How to attach the heat-sensitive device to the heat exchanger - Google Patents

Description

Description: FIELD OF APPLICATION AND SUMMARY OF THE INVENTION The present invention relates to a method of mounting a heat sensitive device for a heat exchanger, in particular,
This is a method for installing a heat-sensitive device, such as a thermal fuse, in which insulating cords for wiring are extended on both sides of the heat-sensitive part, and is installed in a separated state with a certain distance from the heat exchanger. It is intended to improve the operation accuracy of this heat sensitive device.

[Prior art and its problems] In a water heater, in order to ensure safety when the heat exchanger is damaged, a heat exchanger housed in a casing or a heat shield installed in the vicinity of the heat exchanger. A heat sensitive device that detects that the part has reached a set temperature or higher is attached to the plate,
By the output of this heat sensitive device, a safe operation such as stopping the operation of the combustion device corresponding to the heat exchanger is performed.

Conventionally, a thermal fuse is used as the heat sensitive device, and the thermal fuse is attached to the heat shield plate (P) provided between the heat exchanger (1) and the casing (K).
As shown in the figure, an insulating cord (21) having a built-in thermal fuse (20) is held by a mounting plate (3), and this mounting plate (3) is the heat shield plate (P) as shown in FIG. Adopt a configuration that is screwed to.

However, in the method using the conventional mounting plate (3), the thermal capacity of the mounting plate is large and the thermal capacity of the heat shield plate (P) is also large, so that the thermal fuse does not operate sensitively and the heat exchanger ( In some cases, it may not be possible to promptly detect that an abnormality has occurred in 1).

The present invention has been made in view of the above point, and is a "safety device abnormality detection unit configured to stop combustion of a combustion device when an abnormality occurs in the heat exchanger (1)," In a method of mounting a heat-sensitive device that performs a predetermined operation when the temperature inside the casing (K) housing the exchanger (1) becomes high ”, there is no influence of the heat exchanger or members in the vicinity thereof. An object of the present invention is to enable sensitive detection of a thermal change in the casing (K) or in the vicinity of the surface of the heat exchanger (1) when the heat exchanger (1) is damaged, so that the detection accuracy can be improved. And

* Regarding the invention of claim 1 [Technical means] The technical means of the present invention taken to solve the above-mentioned problem is "the heat-sensitive device (2) and the insulation cords (21) on both sides thereof.
(21) is formed by extension, the insulation cords (21) and (21) are installed between the water pipes (10) and (10) of the heat exchanger (1), and the heat sensitive device (2) is connected to the water pipe. It is located at a position away from (10) and away from the surface of the heat exchanger (1). "

[Operation] The above technical means of the present invention operates as follows.

Insulating cords (21) and (21) are installed between the water pipes (10) and (10), and the heat sensitive device (2) is attached to the heat exchanger (1). Since this heat-sensitive device (2) is formed by extending the insulating cords on both sides, the water pipe (10)
Since the heat-sensitive device (2) is located between (10) and separate from the surface of the heat exchanger, the influence of heat conduction from the surface of the heat exchanger does not occur during operation of the appliance. Of course, the heat sensitive device (2) is not affected by the heat transfer to the water pipe (10), the casing (K) and the like. Therefore, when the temperature in the vicinity of the surface of the heat exchanger (1) or the temperature in the casing (K) reaches a predetermined high temperature due to damage to a part of the heat exchanger (1), etc. The temperature of the detected location can be detected under the condition that the heat transfer does not affect the temperature.

[Effects] The present invention having the above-described configuration has the following unique effects.

The heat-sensitive device (2) is to be detected under the condition that it is not affected by the portion for supporting it, the heat exchanger (1), and further, the conduction heat from the casing (K) or heat transfer to them. Since the temperature of the target can be detected, when an abnormality occurs in the heat exchanger (1), this can be detected promptly.

Regarding the invention of claim 2, the invention of claim 2 solves the same problem as that of the invention of claim 1 described above, and also makes it possible to reduce restrictions on the mounting conditions of the heat-sensitive device. To do.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is "the heat-sensitive device (2) and the insulation cords (21) on both sides thereof.
(21) is an extended structure, and is a holder comprising a mounting portion (3a) for mounting on the water pipe (10) of the heat exchanger (1) and a cord holding portion (3b) extended from this mounting portion. (30), and this holder (30) is attached to the mounting part (3
The cord holder (3b) is attached to the water pipe (10) using a), and the cord holder (3b) at the tip is made to hold the heat sensitive device (2) or the insulating cord (21) equipped with the device.
Is set apart from the surface of the heat exchanger (1), and the heat capacity of the entire holder (30) is set to be small ”.

[Operation] The above technical means of the present invention operates as follows.

The heat-sensitive device (2) is attached to the surface of the water pipe (10) or the heat exchanger in the vicinity thereof by using the holder (30). In the attached state, the heat-sensitive part (2) separates from the water pipe (10) and heats up. It is located away from the surface of the exchanger (1). Further, since the heat capacity of the holder (30) is set to be small, the holder (30) operates in a heat-sensitive condition under the condition that the influence of conduction heat from the water pipe or the heat exchanger is unlikely to occur.

Furthermore, since the heat-sensitive device (2) is held by the holder (30), the heat-sensitive device (2) has the heat-exchanger (1) even in a portion other than the middle portion of the water pipe (10) (10). ) Is mounted away from the surface.

[Effects] Since the present invention has the above-mentioned configuration, it has the following unique effects.

Heat transfer to the casing (K) does not occur, and of course, the thermosensitive operation is performed under the condition that the effect of heat transfer to the water pipe (10) is less likely to occur. To do.

In addition, since the heat sensitive device (2) can be attached in a predetermined state even in a portion other than the middle portion of the water pipes (10) (10), restrictions on attachment of the heat sensitive device are alleviated.

* Regarding the invention of claim 3 The invention of claim 3 specifies the relationship between the holders (30) (30) and the heat-sensitive device (2) of the invention of claim 2 described above. , "The cord portion of the thermal fuse (20) is installed between a plurality of holders (30) (30) and the thermal fuse is positioned between the holders (30) (30)".

By adopting this configuration, the heat conduction from the heat exchanger (1) to the heat sensitive device (2) is surely blocked, and the detection accuracy of the heat sensitive device (2) is further improved.

* About the invention of claim 4 This invention solves the same problem as the invention of claim 2 described above, and a heat shield in which a holding device (30) holds a heat-sensitive device in a casing (K). It is specified in relation to the plate (P), and the configuration for this is to provide a heat shield plate (P) at a constant distance from the body surface of the heat exchanger (1), Mounting part for mounting on plate (P) (3
a) and the cord holder (3
b) and a holder (30), and the holder (30) is attached to the heat shield plate (P) by using the attachment portion (3a), and the cord holder (3b) at the tip has a heat-sensitive device ( 2) or an insulating cord (21) equipped with this is held, and the position of the cord holding portion (3b) is moved away from the surfaces of the heat shield plate (P) and the heat exchanger (1), and the holder ( 30) The overall heat capacity was set small ”.

According to this structure, only the mounting portion (3a) is located on the heat shield plate (P) side, which is different from the invention of claim 2 described above, and the other portions operate in the same manner. The same effect as the invention of Item 2 is obtained.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 11.

* First Embodiment This embodiment corresponds to the invention of claim 1 above.
A thermal fuse (20) is adopted as the heat sensitive device (2) and is located between the water pipes (10) and (10) of the heat exchanger (1).

In the heat exchanger (1) of the water heater, an explanatory view of the conventional example (No. 12
As shown in the figure), a water pipe (10) is wound around the outer periphery of the body part multiple times.

Since there is a constant space between the water pipes (10) (10), the insulation cords (21) (21) of the thermal fuse (20) are connected to each other as shown in FIG. 1 in this embodiment. It is fixed to the water pipe (10) using a clip (C). In this case, since the surface temperature of the water pipe (10) is relatively low even during the heat exchange operation, even if the insulation cords (21) (21) are directly attached to the water pipe (10), there is a risk of thermal damage. There is no.

In particular, in this embodiment, a plurality of thermal fuses (20) (2
0) is connected in series via insulation cords (21) (21), and the whole is laid in a zigzag pattern between the water pipes (10) (10) and approximately in the middle of the water pipes (10) (10). The thermal fuse (20) is located at the position.

In the case of this embodiment, as shown in FIG. 2, the clip (C) has a C-shape having a size slightly smaller than the size of the cross section of the water pipe (10), and is entirely made of elastic metal. It is made of plate or wire. When fixing to the water pipe using this clip (C), the middle of the insulation cord (21)
As shown in FIG. 3, the water pipe (10) is fixed by a clip (C) so as to be located at the top of the sectional view. This allows
The thermal fuse (20) located between the fixed parts is located at a constant distance from the surface of the body of the heat exchanger (1) as shown in the figure.

Further, in the above heat-sensitive device in which a plurality of temperature fuses (20) (20) are connected in series, the insulating cords are arranged in a zigzag pattern between the water pipes (10) (10), and the water pipes (10) that are easily damaged (Ten)
Since the thermal fuses (20) are arranged at a predetermined interval with respect to the heat exchanger body portion between them, a wide range of damage to the heat exchanger (1) is to be detected. Further, as shown in FIG. 1, the position of each thermal fuse (20) is changed to the water pipe (10).
Since it is possible to shift in the width direction between (10), it is possible to detect abnormalities more accurately over a wide range.

The clip (C) may have the configuration shown in FIG. In this case, since the cord retaining ring (C ₁ ) is provided at the center top, when the insulating cord (21) is fixed to the water pipe, the insulating cord surely ensures the water pipe (10).
Will be located at the top of the.

* Second Embodiment In this embodiment, the heat sensitive device (2) is a thermal fuse (20) having the same structure as in the first embodiment, and a leaf spring material is used as shown in FIGS. 5 and 6. It is adapted to be attached to the water pipe (10) by a holding tool (30).

The holder (30) is made of a strip-shaped plate material having a constant width by a combination of punching and bending.

Therefore, the clip portion (31) as the attaching portion (3a) for attaching to the water pipe (10) is constructed by bending the whole into a rectangular U-shape, and both end portions thereof have protruding portions that project inwardly. (34) (34) is formed and this protrusion (34) (34)
Project over the entire width of the strip.

An extension piece (32) is extended from the one protruding portion (34) in a direction substantially perpendicular to the water pipe holding piece of the clip part (31), and the extension piece is extended from the water pipe holding piece (32). It is a base end piece (37) up to the middle and an inclined piece (38) following the base end piece (37). This inclined piece (38) is an extension piece (3
A holding piece (33) that is inclined from the base end of 2) toward the top surface (35) side of the clip part (31) and bent in an L-shape from the tip of the inclined piece (38) is a base piece. It is extended toward the (37) side. The holding piece (33) of this embodiment includes an extension piece (3
A part of 2) is formed by cutting and raising, and a part of the extension piece (32) is used as the holding piece (33) as it is, and the extension piece (32) is used as it is. The lower area of the holding piece (33) in the opening (36)
Has become. The holding piece (33) corresponds to the above-mentioned code holding portion (3b). The tip end portion is slightly inclined upward (the top surface of the clip portion (31)), the base end portion is arcuate, and the space between them is a direct side portion. The size of the arcuate portion is set to be slightly smaller than the cross section of the insulating cord (21) provided with the temperature fuse (20) as a heat sensitive device.

To attach the insulation cord (21) equipped with the thermal fuse (20) to the water pipe (10) using this holder, the clip portion (31) of the heat exchanger (1) is attached to the water pipe (10) as shown in FIG. Fit in the water pipe (10). Since the clip portion (31) is provided with the protrusions (34) (34), the top of the cross section of the protrusions (34) (34) is attached to the body (11) in the mounted state. It is fitted in the recess between the water pipe (10) and the surface of the body (11), and is held in the retaining state by the elastic force of the constituent materials.
In this case, the protrusions (34) (34) may contact the surface of the body (11).

In the holder attached to the water pipe (10) as described above,
The inclined piece (38) of the extension piece (32) is separated from the surface of the body (11) according to the degree of inclination thereof. And
Insert the insulation cord (21) from the tip side of the holding piece (33) into the arcuate portion on the base end side of the holding piece (33) so that the thermal fuse (20) is located at the opening (36). Press into. Then, the size of this arc-shaped portion is the insulation cord (21).
Since the diameter of the insulating cord (21) is set to be slightly smaller than the diameter of the insulating cord (21), the insulating cord (21) is held by the holding pieces (33) on both sides of the opening (36) of the extension piece (32). At this time, since the whole is made of the leaf spring material, the insulating cord (21) is pinched and held between it and the extension piece (32) by the elastic restoring force of the holding piece (33). In this state, the thermal fuse (20) of the insulation cord (21) is located in the opening (36) formed by cutting and raising the holding piece (33).
Can easily detect the ambient temperature through the opening (36).

In particular, in this embodiment, since the projections (34) (34) are formed at both ends of the clip part (31), the diameter of the water pipe (10) is between the hanging pieces of the clip part (31). Even if it is larger than the width, it can be installed in the retaining state as it is within a certain limit.

Further, in order to attach a plurality of temperature fuses to the heat exchanger (1), it is possible to attach the temperature fuses at a plurality of locations by preparing the number of the holders corresponding to the number of the temperature fuses.

In the above embodiment, the thermal fuse (20) is located on the holder (30), but the thermal fuse (20) is located between the adjacent holders (30) (30). The insulation cord (21) may be fixed.

Further, as shown in FIG. 7, a plurality of holders (30) (30)
It is also possible to use the insulating cord (21) by means of which the thermal fuse (20) is located between these holders. In addition, as in the first embodiment, a plurality of temperature fuses (20) (20) are connected in series by insulating cords (21) (21), and a portion of each insulating cord (21) is held by a holder (30). It may be held by. These two cases correspond to the embodiment of the invention of claim 3.

In the holder (30) of the above embodiment, the mounting portion (3a) is fitted to the water pipe (10), but this is welded or caulked to the body surface other than the water pipe (10) of the heat exchanger. You may make it adhere | attach by methods, such as a stop. Further, in the above embodiment, the entire holding tool (30) is constituted by the leaf spring,
This may be constituted by a metal elastic wire as shown in FIGS. 8 to 10. In this case, the heat capacity becomes smaller than that of the leaf spring of the second embodiment. ,
The heat conduction from the water pipe (10) is also small, and even when the temperature fuse (20) is directly held in the cord holding part (3b), the influence of the heat conduction from the water pipe or the heat exchanger surface to this temperature fuse. Is more reliably avoided.

* Third Embodiment In this embodiment, similarly to the conventional example, a heat shield plate (P) is provided between the heat exchanger (1) and the casing (K), and the heat shield plate (P) is heat-sensitive. The device (2) is of a type to be held, and corresponds to the embodiment of claim 4.

In this embodiment, the holder (30) is erected from the heat shield plate (P), and the heat sensitive device (2) is attached to the cord holder (3b) at the tip of the holder.
So that the temperature fuse (20) or the insulation cord (21) extended therefrom is held, and the holder (30) is disposed at the water pipe (10) of the heat exchanger (1).
It is set in advance in relation to (10), and when the heat shield (P) is fixed in the device, the entire holder (30) or the cord holder (3b) is replaced by the heat exchanger (1). It is located away from the surface, the water pipe (10) and the heat shield plate (P). Further, the holder (30) is made of a metal wire rod, a thin plate, or the like, and the overall heat capacity is set small. In this case, the influence of conduction heat from the high temperature part of the heat exchanger (1) to the temperature fuse (20) and the temperature of the water pipe (10) and the heat shield (P) are eliminated, and It has the same operation and effect as in the case of the embodiment.

In each of the above embodiments, the thermal fuse (20) has been described as an example of the heat sensitive device (2). However, as long as the heat sensitive device (2) is of the type in which the insulation cord (21) is connected in series, the thermistor is used. It goes without saying that other types of heat sensitive devices such as

[Brief description of drawings]

1 is an explanatory view of a main part of the first embodiment of the present invention, FIG. 2 is an explanatory view of a clip (C) used for this, FIG. 3 is a sectional view taken along line XX, and FIG. 4 is a clip (C). Explanatory drawing of the modification of FIG.
The figure shows a front view of a holder (30) adopted in the second embodiment,
FIG. 7 is an explanatory view of a main part of the second embodiment, FIG. 7 is an explanatory view of another example, FIG. 8 is a side view of a holding tool (30) in another usage state, and FIG. 9 is a front view thereof. , FIG. 10 is a plan view thereof, FIG. 11 is an explanatory view of essential parts of the third embodiment, FIG. 12 is an explanatory view of a conventional heat-sensitive device attached state, and FIG. 13 is an explanatory view of a heat-sensitive device holder. Yes, in the figure, (20) …… thermal fuse (1) …… heat exchanger (11) …… body (10) …… water pipe (31) …… clip (32) …… extension piece (33) …… Holding piece (3a) …… Mounting part (3b) …… Holding part

Claims (4)

[Claims] Claim: What is claimed is: 1. An abnormality detection part of a safety device for stopping combustion of a combustion device when an abnormality occurs in the heat exchanger (1), the casing (K) accommodating the heat exchanger (1). In a method of mounting a heat-sensitive device (2) which performs a predetermined operation when the internal temperature of () becomes high, the heat-sensitive device (2) is formed by extending insulating cords (21) (21) on both sides thereof. The water pipe (10) (1) of the heat exchanger (1)
0) By installing the insulation cords (21) (21) between each other,
A method for mounting a heat-sensitive device on a heat exchanger, wherein the heat-sensitive device (2) is located at a position away from the water pipe (10) and away from the surface of the heat exchanger (1). 2. A casing (K) for accommodating the heat exchanger (1), which is an abnormality detecting portion of a safety device for stopping combustion of a combustion device when an abnormality occurs in the heat exchanger (1). In a method of mounting a heat-sensitive device (2) which performs a predetermined operation when the internal temperature of () becomes high, the heat-sensitive device (2) is formed by extending insulating cords (21) (21) on both sides thereof. And a cord holder (3b) extended from the attachment part (3a) for attaching to the surface of the heat exchanger (1) or the water pipe (10) of the heat exchanger (1), and the holder (30). And the holder (30) is attached to the attachment part (3
a) is attached to the heat exchanger (1), and the cord holder (3b) at the tip is made to hold the heat sensitive device (2) or the insulating cord (21) equipped with the same, and the cord holder (3b) is held. Is attached to the surface of the heat exchanger (1) so that the heat capacity of the entire holder (30) is set to be small. 3. The heat sensitive device (2), wherein the cord portion is installed between a plurality of holders (30) (30), and the thermal fuse is located between the holders (30) (30). A method for attaching a heat-sensitive device to the heat exchanger according to. 4. A casing (K) for housing a heat exchanger (1), which is an abnormality detection part of a safety device for stopping combustion of a combustion device when an abnormality occurs in the heat exchanger (1). In a method of mounting the heat sensitive device (2) which performs a predetermined operation when the temperature inside the () becomes high, the heat shield (P) is spaced from the body surface of the heat exchanger (1) at a constant interval. And a mounting part (3) for mounting on this heat shield plate (P).
a) and cord holder (3b) extended from this attachment
The holder (30) is constituted by and the holder (30) is attached to the heat shield plate (P) by using the attaching portion (3a), and the heat-sensitive device (2) is attached to the cord holding portion (3b) at the tip. Alternatively, the insulated cord (21) equipped with this is held, and the position of the cord holding portion (3b) is adjusted to the heat shield plate (P) and the heat exchanger (1).
A method for attaching a heat-sensitive device to a heat exchanger in which the heat capacity of the entire holder (30) is set to be small by separating it from the surface of the heat exchanger.