JP2016109336A - Abnormality detection device for water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detection device for a water heater that has excellent work efficiency in a manufacturing process and enables reduction in loss of expensive metallic materials.SOLUTION: An abnormality detection device is provided in a water heater including: a burner; a cylindrical body forming a combustion chamber of the burner; a heat exchanger provided in an upper part of the cylindrical body; combustion chamber temperature detection means that is arranged while facing the combustion chamber through a temperature measurement opening formed on the cylindrical body; and a control means for controlling combustion of the burner on the basis of detection information of the combustion chamber temperature detection means. The abnormality detection device includes: a fixation member 1a that is mounted to the cylindrical body, has a through hole 31 opposing to the temperature measurement opening of the cylindrical body and a projecting piece 11a projecting inwards from the peripheral edge of the through hole and comprises first metal; and an electrode body 1b comprising second metal different from the first metal. A thermocouple 1 functioning as the combustion chamber temperature detection means is constituted by joining the projecting piece 11a of the fixation member 1a comprising the first metal to the electrode body 1b comprising the second metal.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water heater, and more particularly to an abnormality detection device for detecting an abnormality of a water heater.

  A water heater provided with an abnormality detection device for detecting an abnormality of combustion is widely used for the purpose of improving safety. One such water heater is a water heater (instantaneous water heater) as disclosed in Patent Document 1.

  As shown in FIG. 6, the water heater disclosed in Patent Document 1 is a water heater provided with a combustion chamber 103 of a main burner 101 and a heat exchanger 104, and is a thermoelectric device heated by a pilot burner 102. The pilot burner 101 includes a pair 105 and a pilot safety circuit C including a magnet M that attracts and holds the shutoff valve V disposed in the fuel supply path to the main burner 101 and the pilot burner 102 by the thermoelectromotive force. This is a water heater (instantaneous water heater) with an oxygen deficiency detection safety device provided with a resistor 106 that gradually increases as the combustion atmosphere temperature rises.

  In the water heater of Patent Document 1, an atmospheric temperature detection thermocouple connected to generate a counter electromotive force with respect to the thermoelectromotive force generated by the thermocouple 105 is used as the resistor 106. In addition, a sub-thermocouple (resistor) 106 connected in a state having a polarity opposite to that of the thermocouple 105 is used as the ambient temperature detection thermocouple.

  And in the water heater of this patent document 1, as shown in FIG. 6, when the electric current which arises from the thermoelectromotive force of the thermocouple 105 heated by the pilot burner 102 is energized to the pilot safety circuit C, another stage Without the need for an amplifier circuit, the magnet M can attract and hold the shutoff valve V provided in the fuel supply path to the main burner 101 and the pilot burner 102 open.

  By the way, in order to attract and hold the shutoff valve V without using the amplifier circuit, the loop resistance value of the pilot safety circuit C needs to be low. Therefore, it is necessary to suppress an increase in resistance value caused by providing the auxiliary thermocouple (resistor) 106 in the pilot safety circuit C.

  Therefore, in order to reduce the resistance of the connection portion between the pilot safety circuit C and the sub thermocouple 106 as much as possible, the lead wire used for connecting the pilot safety circuit C and the sub thermocouple 106 and the sub thermocouple 106 are usually Will be connected by welding.

  In addition, when a stranded wire is used as the lead wire, the lead wire may be melted by welding when the lead wire and the auxiliary thermocouple 106 are welded. Usually, a single wire is used instead of a stranded wire. However, if the cross-sectional area of the lead wire (conductor cross-sectional area) is the same, the single wire is less flexible than the wire, so the lead wire There is a problem that handling is poor and workability in the manufacturing process is lowered.

  Further, Patent Document 2 discloses a thermocouple device including a thermocouple 201 and lead wires 205 connected to both ends which are cold junctions 206 and 207 of the thermocouple 201 as shown in FIG. Has been.

  In this thermocouple device, the thermocouple 201 is composed of a first strip 202 and a second strip 203 made of different kinds of plate-like metal materials, and the hot junction of the thermocouple 201 is the first junction. It is formed by welding the tip portions 202 a and 203 a of the strip 202 and the second strip 203. Further, the other end portions of the first and second strips 202 and 203 connected to the lead wire 205 are crimped portions 202d and 203d which are crimped to the lead wire 205 by caulking and hold the same, In addition, the thermocouple 201 and the lead wire 205 are electrically connected by caulking the caulking portions 202d and 203d to hold and fix the lead wire 205.

  The thermocouple 201 is connected to a burner controller 212 via a lead wire 205, and is configured to operate a main valve (not shown) via a burner controller (not shown).

  In the case of the thermocouple device of Patent Document 2 configured as described above, the manufacture is easy and the productivity is excellent. That is, in Patent Document 1 described above, the shutoff valve V is adsorbed and held open without using an amplification path, so that the lead wire 205 and the thermocouple 201 are connected by welding, While it is necessary to use a single wire instead of a stranded wire as the lead wire 205, in Patent Document 2, a thermocouple is connected to the burner controller via the lead wire 205, and the main wire is connected via the burner controller. Since the valve is configured to operate, the thermocouple 201 and the lead wire 205 can be connected by caulking instead of welding, and a stranded wire can be used as the lead wire. Therefore, workability in the manufacturing process can be improved, and productivity is excellent.

  However, the hot water supply device (gas water heater) provided with the thermocouple device of Patent Document 2 has the following problems.

In the thermocouple device of Patent Document 2, the cold junctions 206, 207 and the cold junctions 206, 207 are covered with an insulating tube, and a positioning member (spacer) is engaged with the portion covered with the insulating tube, whereby the cold junctions 206, 207, The lead wire 205 is configured to maintain a predetermined interval. That is, in Patent Document 2, one end side of two kinds of metals (a first strip 202 and a second strip 203 made of different kinds of plate-like metal materials) are joined to form a thermocouple 201, The insulating tube covers the vicinity of the cold junctions 206 and 207, which are the other ends of the two types of metals 202 and 203 constituting the thermocouple 201, and the portion covered by the insulating tube is engaged with the positioning member. Thus, it is attached near the combustion chamber of the water heater.
In this case, of course, it is necessary to attach the positioning member engaged with the thermocouple 201 to the vicinity of the combustion chamber of the water heater.

That is, even with the technique of Patent Document 2, in order to arrange a thermocouple for detecting the atmospheric temperature of the combustion chamber in the hot water supply device (gas water heater), (1) formation of a thermocouple, (2) formation. Three steps are required: engagement (attachment) of the thermocouple to the positioning member, and (3) attachment of the positioning member to which the formed thermocouple is engaged (attachment) in the vicinity of the combustion chamber. .
And as a result of requiring the above three processes, the man-hour at the time of water heater manufacture increases, and there exists a problem of causing the increase in cost.

Japanese Utility Model Publication No. 58-181150 Japanese Utility Model Publication No. 3-112463

  The present invention solves the above-described problems, does not impair the workability in the manufacturing process, and detects the atmospheric temperature of the combustion chamber when manufacturing a water heater (specifically, when providing an abnormality detection device). An object of the present invention is to provide an abnormality detection device for a hot water heater that can be easily disposed without requiring a large number of man-hours and is excellent in productivity.

In order to solve the above problems, the abnormality detection device for a water heater of the present invention is
With a burner,
A cylinder forming a combustion chamber of the burner;
A heat exchanger provided at an upper portion of the cylinder body and heated by combustion heat of the burner;
Combustion chamber temperature detection means provided in a state of facing the combustion chamber through a temperature measuring opening formed in the cylinder body;
In an abnormality detection device provided in a water heater comprising: control means for controlling combustion of the burner based on detection information of the combustion chamber temperature detection means;
A fixing member attached to the cylinder body, comprising a through-hole facing the temperature measurement opening of the cylinder body, and a projecting piece protruding inward from a peripheral edge of the through-hole. A fixing member made of a metal of
An electrode body made of a second metal different from the first metal,
A thermocouple that functions as the combustion chamber temperature detection means is configured by joining the protruding piece of the fixing member made of the first metal and the electrode body made of the second metal. It is characterized by this.

  In the water heater abnormality detection device of the present invention, it is preferable that a lead wire connecting electrode is integrally formed on the fixing member.

  Moreover, it is preferable that the said electrode body consists of a wire with a circular cross section.

  In the water heater abnormality detection device of the present invention, a through-hole located so as to face the temperature measuring opening of the cylinder body is formed, and a protruding piece protruding inward from the periphery of the through-hole is provided. A fixing member made of a first metal and an electrode body made of a second metal different from the first metal, and a protruding piece of the fixing member made of the first metal, and a second metal Since the thermocouple functioning as the combustion chamber temperature detecting means is configured by joining the electrode body, the thermocouple for detecting the atmospheric temperature of the combustion chamber when manufacturing the water heater is provided. Thus, it can be easily provided without requiring many man-hours, and the cost can be reduced.

  That is, (1) formation of a thermocouple by joining a protruding piece of a fixing member made of a first metal and an electrode body made of a second metal, and (2) a cylindrical body of the fixing member to which the electrode body is joined Since it becomes possible to provide the thermocouple for detecting the atmospheric temperature of a combustion chamber with respect to a water heater by two structures, (attachment to (combustion chamber)), in order to provide a thermocouple in a water heater The number of man-hours can be reduced.

  Further, when the lead wire connecting electrode is integrally formed on the fixing member, the lead wire connecting the control means and the thermocouple can be easily connected to the thermocouple. Can be made more effective.

  In addition, when a wire having a circular cross section is used for the electrode body, as in the case where the electrode body is formed by punching a plate material by pressing, the material loss is prevented so that no debris is generated in the electrode body material. Can be reduced.

It is a front view which shows the structure of the water heater provided with the abnormality detection apparatus concerning one Embodiment (Embodiment 1) of this invention. It is a perspective view which shows the thermocouple formed by joining the fixing member and the electrode body which comprise the abnormality detection apparatus concerning Embodiment 1 of this invention. It is a perspective view which shows the fixing member and electrode body before joining which comprise the abnormality detection apparatus concerning Embodiment 1 of this invention. It is a perspective view which shows the thermocouple formed by joining the fixing member and the electrode body which comprise the abnormality detection apparatus concerning other embodiment (Embodiment 2) of this invention. It is a perspective view which shows the fixing member and electrode body before joining which comprise the abnormality detection apparatus concerning Embodiment 2 of this invention. It is a figure which shows the conventional water heater (instantaneous water heater) with an oxygen deficiency detection safety device. It is a conventional thermocouple device, and is a figure which shows the thermocouple device which has the structure where the lead wire was connected to the cold junction of the both ends of a thermocouple.

[Embodiment 1]
FIG. 1 is a front view showing a water heater A provided with an abnormality detection device according to an embodiment (Embodiment 1) of the present invention, and FIG. 2 shows a fixing member constituting the abnormality detection device according to Embodiment 1. 3 is a perspective view showing a thermocouple formed by joining an electrode body, and FIG. 3 is a perspective view showing a fixing member and an electrode body before joining, constituting the abnormality detection apparatus according to the first embodiment.

  As shown in FIG. 1, the water heater A includes a water heater body 10, a cover 20 that covers the water heater apparatus body 10, a burner 21 that burns fuel gas, a combustion chamber 22, and a cylinder that forms the combustion chamber 22. A cylinder 24, a heat exchanger 23 provided on the upper part of the cylinder cylinder 24, for exchanging heat between the combustion gas in which fuel is burned by the burner 21 and water, and a temperature measurement formed on the cylinder cylinder 24. Thermocouple (combustion chamber temperature detecting means) 1 provided in a state of facing the combustion chamber 22 through the opening 25 and control means (not shown) for controlling the combustion of the burner 21 based on the detection information of the thermocouple 1 And.

  Moreover, this water heater A is provided with the abnormality detection apparatus concerning Embodiment 1 of this invention, and when the detection temperature by the thermocouple 1 is higher than predetermined temperature, the heat exchanger 23 will be clogged, As a result, The pressure in the cylinder body 24 forming the combustion chamber 22 rises, and it is determined that high-temperature combustion gas is flowing out of the cylinder body 24 through the temperature measurement opening 25, and the control means is a solenoid valve (not shown). ) Is closed, the fuel supply path is shut off, and combustion of the burner 21 is stopped. The control means is configured to be driven using a battery (not shown) as a power source.

And the water heater A concerning this Embodiment 1 is provided with the thermocouple which has a structure which is demonstrated below as the thermocouple 1 which is a means for detecting a combustion chamber temperature.
That is, the thermocouple 1 according to the first embodiment includes a fixing member 1 a made of a first metal (for example, stainless steel) attached to the cylinder body 24. The fixing member 1a includes a through-hole 31 positioned so as to face the temperature measurement opening 25 of the cylinder body 24 (see FIG. 2).
2 and 3, the through-hole 31 of the fixing member 1a is integrally formed from the same material as the other parts of the fixing member 1a, and protrudes inward from the peripheral edge of the through-hole 31. 11a is provided. Further, the tip end side of the projecting piece 11a has a wound structure, and is configured such that one end of the electrode body 1b is inserted.

  A first lead 3 (3a) connected directly or indirectly to the control means is connected to the end of the fixing member 1a via, for example, a crimp terminal (not shown). The line connecting electrode 35 is integrally formed. The first lead wire connecting electrode 35 is provided with a notch 34a so as to be surely coupled with the crimp terminal.

  The thermocouple 1 is made of a second metal (for example, constantan) different from the first metal, and one end of the thermocouple 1 is joined to the fixing member 1a to form the thermocouple 1 and has a circular cross section. The electrode body 1b comprised from the wire is provided.

  The other end of the electrode body 1b is connected to a second lead wire 3 (3b) directly or indirectly connected to the control means via, for example, a crimp terminal (not shown). The lead wire connecting electrode 36 is configured to function.

  And in this Embodiment 1, the thermocouple 1 is formed by joining the edge part of the one side of the electrode body 1b to the protrusion 11a of the said fixing member 1a. That is, the protrusion 11a and the electrode body 1b are joined by winding and holding one end of the electrode body 1b at a portion having a wound structure on the tip end side of the protrusion 11a. . Specifically, after inserting one end of the electrode body 1b into a portion having a wound structure at the tip of the projecting piece 11a, the portion around which the tip of the projecting piece 11a is wound is crimped, By joining the wound portion of the tip of the projecting piece 11a to the electrode body 1b, the projecting piece 11a of the fixing member 1a and the one end of the electrode body 1b are joined.

  In addition, by welding or soldering the wound portion of the tip of the projecting piece 11a and the one end of the electrode body 1b by a method such as spot welding, higher joint reliability can be obtained. It can also be configured to be obtained.

  The first lead wire 3 (3a) (FIG. 1) directly or indirectly connected to the control means is connected to the first lead wire connecting electrode 35 of the fixing member 1a, for example, a crimp terminal (not shown). ) And the second lead wire 3 (3b) connected directly or indirectly to the control means at the other end of the electrode body 1b functioning as the second lead wire connecting electrode 36. By connecting (FIG. 1) via, for example, a crimp terminal (not shown), a water heater A having an abnormality detection device as shown in FIG. 1 is obtained.

  When configured as in the first embodiment, the thermocouple 1 that functions as the combustion chamber temperature detecting means is formed from the fixing member 1a (the protruding piece 11a) and the electrode body 1b. When manufacturing A, the thermocouple 1 for detecting the atmospheric temperature of the combustion chamber can be easily provided without requiring a large number of man-hours, and the cost can be reduced.

  Specifically, the protrusion 11a of the fixing member 1a made of the first metal is joined to the electrode body 1b made of the second metal, and the cylindrical body 24 of the fixing member 1a to which the electrode body 1b is joined. Since the thermocouple 1 for detecting the atmospheric temperature of the combustion chamber 22 can be provided in the water heater A simply by attaching the heater, it is possible to reduce the man-hour for providing the thermocouple in the water heater. it can.

  Since the lead wire connecting electrode 35 is formed integrally with the fixing member 1a, the fixing member constituting the thermocouple 1 of the first lead wire 3 (3a) connecting the control means and the thermocouple 1 is provided. It becomes possible to easily connect to 1a. However, the lead wire connecting electrode 35 is not formed integrally with the fixing member 1a, but the first lead wire 3 (3a) for connecting the control means and the thermocouple 1 is connected to the fixing member 1a with a screw or the like. It is also possible to configure as described above.

  In the first embodiment, since the electrode body 1b formed from a wire having a circular cross section is used, the electrode body 1b is formed as in the case where the electrode body 1b is formed by stamping a plate material. There is no loss of material such as punched residue when forming, and the cost can be reduced accordingly.

[Embodiment 2]
FIG. 4 is a perspective view showing a thermocouple formed by joining a fixing member and an electrode body, which constitutes the abnormality detection device according to the second embodiment, and FIG. 5 constitutes the abnormality detection device according to the second embodiment. It is a perspective view which shows the fixing member and electrode body before joining.
Although not particularly illustrated, in the second embodiment, the configuration of the water heater A is the same as that in the first embodiment.

And also in this Embodiment 2, although the thermocouple 1 is formed by joining the fixing member 1a which consists of the 1st metal (for example, stainless steel) attached to the cylinder body 24, and the electrode body 1b, In 2nd Embodiment, the structure of the fixing member 1a and the electrode body 1b differs from the case of the said Embodiment 1. FIG.
Below, the structure of the fixing member 1a and the electrode body 1b which comprise the thermocouple 1 used in Embodiment 2 is demonstrated in detail with reference to FIG. 4 and FIG.

  The fixing member 1 a used in the second embodiment is entirely formed of a first metal (for example, stainless steel), and has a through-hole 31 positioned so as to face the temperature measurement opening 25 of the cylinder body 24. I have.

  And the fixing member 1a is provided with the through-hole 31 located so that the opening 25 for temperature measurement of the cylinder body 24 may be opposed, and the through-hole 31 is formed from the same material as the other part of the fixing member 1a. A protruding piece 11a is provided that protrudes inward from the periphery of the through-hole 31.

  In the second embodiment, the three sides of the projecting piece 11a are cut and raised, and the three sides are erected on the opposite side of the direction toward the temperature measuring opening 25 of the cylinder body 24. A standing portion 11b is formed. The three standing portions 11b are configured to function as a positioning portion at one end of the electrode body 1b to be joined and to function as a gripping portion that grips the electrode body 1b.

  Also in the second embodiment, the first lead wire 3 (3a) directly or indirectly connected to the control means is connected to the end of the fixing member 1a via, for example, a crimp terminal (not shown). A first lead wire connecting electrode 35 to be connected is integrally formed. The first lead wire connecting electrode 35 is provided with a notch 34a so as to be surely coupled with the crimp terminal.

The second embodiment also includes an electrode body 1b that constitutes the thermocouple 1 together with the fixing member 1a.
The electrode body 1b according to the second embodiment is an elongated plate-like member that is made of a second metal (for example, constantan) different from the first metal and is joined to the fixing member 1a to form the thermocouple 1. The first bent portion 33a is bent at a substantially right angle, and the second bent portion 33b, which is different from the first bent portion 33a, is bent at a substantially right angle on the opposite side to the first bent portion. ing.

  The other end of the electrode body 1b is connected to a second lead wire 3 (3b) directly or indirectly connected to the control means via, for example, a crimp terminal (not shown). The lead wire connecting electrode 36 is configured to function. The other end (second lead wire connecting electrode) 36 of the electrode body 1b is provided with a notch 34b so as to be surely coupled with the crimp terminal.

  And in Embodiment 2, after positioning the edge part of one side of the electrode body 1b with the standing part 11b formed by cutting and raising the peripheral part of the protrusion 11a, the standing part 11b is the electrode body 1b. The protruding portion 11a of the fixing member 1a and the electrode body 1b are joined by caulking the standing portion 11b so as to be in pressure contact with the one end portion. Thus, the thermocouple 1 is formed by joining the protruding piece 11a of the fixing member 1a and the electrode body 1b.

  In addition, it is also possible to configure so that higher joint reliability can be obtained by welding or soldering the joint between the projecting piece 11a and the electrode body 1b by a method such as spot welding. is there.

  The first lead wire 3 (3a) (FIG. 1) directly or indirectly connected to the control means is connected to the first lead wire connecting electrode 35 of the fixing member 1a, for example, a crimp terminal (not shown). ) And the second lead wire 3 (3b) directly or indirectly connected to the control means at the other end of the electrode body 1b functioning as the second lead wire connecting electrode 36. ) (FIG. 1) is connected through, for example, a crimp terminal (not shown), to obtain a water heater A having an abnormality detection device as shown in FIG.

  Even when configured as in the second embodiment, the thermocouple 1 that functions as the combustion chamber temperature detecting means is formed from the fixing member 1a (the protruding piece 11a) and the electrode body 1b. Simply joining the protruding piece 11a of the fixing member 1a made of one metal and the electrode body 1b made of the second metal, and attaching the fixing member 1a to which the electrode body 1b is joined to the cylinder body 24 The hot water heater A can be provided with a thermocouple for detecting the atmospheric temperature of the combustion chamber 22, reducing the number of steps in the manufacturing process of the hot water heater A, and detecting the abnormality of the hot water heater excellent in economy. An apparatus can be provided.

  Also in the case of the second embodiment, since the lead wire connecting electrode 35 is formed integrally with the fixing member 1 a, the first lead connecting the control means and the fixing member 1 a constituting the thermocouple 1. It becomes possible to easily connect the wire 3 (3a) to the thermocouple 1. However, the lead wire connecting electrode 35 is not formed integrally with the fixing member 1a, but the first lead wire 3 (3a) for connecting the control means and the thermocouple 1 is connected to the fixing member 1a with a screw or the like. It is also possible to configure as described above.

  In the water heater abnormality detection device of the present invention, a stranded wire can be used as a lead wire for electrically connecting the control means and the output end of the thermocouple. Can improve productivity.

  The present invention is not limited to the above embodiment in other points, and various applications and modifications can be made within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Thermocouple 1a Fixing member 1b Electrode body 3 (3a) 1st lead wire 3 (3b) 2nd lead wire 10 Water heater body 11a Projection piece of fixing member 11b Standing portion 20 Cover 21 Burner 22 Combustion chamber 23 Heat Exchanger 24 Cylinder body 25 Opening for temperature measurement 31 Through hole 33a First bent portion 33b Second bent portion 34a, 34b Notch 35 First lead wire connecting electrode 36 Second lead wire connecting electrode A Water heater

Claims (3)

With a burner,
A cylinder forming a combustion chamber of the burner;
A heat exchanger provided at an upper portion of the cylinder body and heated by combustion heat of the burner;
Combustion chamber temperature detection means provided in a state of facing the combustion chamber through a temperature measuring opening formed in the cylinder body;
In an abnormality detection device provided in a water heater comprising: control means for controlling combustion of the burner based on detection information of the combustion chamber temperature detection means;
A fixing member attached to the cylinder body, comprising a through-hole facing the temperature measurement opening of the cylinder body, and a projecting piece protruding inward from a peripheral edge of the through-hole. A fixing member made of a metal of
An electrode body made of a second metal different from the first metal,
A thermocouple that functions as the combustion chamber temperature detection means is configured by joining the protruding piece of the fixing member made of the first metal and the electrode body made of the second metal. An abnormality detection device for a water heater.   The abnormality detection device for a hot water heater according to claim 1, wherein a lead wire connecting electrode is integrally formed on the fixing member.   The hot water heater abnormality detection device according to claim 1 or 2, wherein the electrode body is made of a wire having a circular cross section.

Images