JP2011027342A - Heat source device and water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat source device and water heater substantially preventing a magnetic field generated by a magnetism generating source of other equipment from affecting a sensor, and downsizing the entire water heater, while providing an arrangement of each of equipment or the like, built in a casing considering efficiency of maintenance work. <P>SOLUTION: The water heater includes a fluid route, the sensor 13, a magnetism generating source and a magnetic shielding member 7. The magnetic shielding member 7 can shield the magnetic field from the magnetism generating source and is arranged between the sensor 13 and the magnetism generating source. The magnetic shielding member 7 is arranged so that a virtual line from the end of the magnetic shielding member 7 to the sensor 13 intersects with the magnetic shielding member 7. Thus, this arrangement can shield the magnetic field generated from the magnetism generating source and the magnetic field derivatively generated from the magnetic shielding member 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a heat source device and a hot water supply device provided with the heat source device, and in particular, a technology that can be suitably applied to a heat source device having a flow sensor using a magnetoresistive element and a hot water supply device provided with the heat source device. About.

  In general, in a gas fuel type heat source device used in a hot water supply apparatus, combustion control is performed based on conditions such as a water supply flow rate and a water supply temperature, thereby controlling the temperature of hot water supplied. In this type of heat source device, pipes such as a fuel supply path and a hot water supply circuit are disposed in the same casing, and a flow rate sensor for detecting the feed water flow rate and a feed water temperature are detected in the pipe line. A temperature sensor or the like is provided.

  Here, generally, flow rate sensors used in hot water supply apparatuses include an impeller-type rotor that rotates in response to a flow of gas or liquid, and a magnetoresistive element that can detect the rotational speed of the impeller. What is provided is employed (for example, a flow meter described in Patent Document 1). Specifically, the flow rate sensor calculates the water supply amount when the impeller receives the flow of water supply and rotates at a rotation speed proportional to the water supply amount, and the rotation speed is detected by the magnetoresistive element. To do. That is, the flow sensor includes a so-called magnetic sensor, and a magnet is integrally attached to the impeller, and the magnetoresistive element detects a change in magnetic field (magnetization source) caused by the rotation of the impeller. The pulse signal is generated.

JP-A-4-220522

  By the way, in the casing of the heat source device, devices such as a blower, a circulation pump, and a solenoid valve that can be a magnetic source are disposed. These devices are provided with a motor or a solenoid (a magnetic source), which generates a magnetic field, so that the flow sensor may be affected by the magnetic field. Therefore, it is conceivable to arrange the flow rate sensor so as to be separated from each device so that the flow rate sensor is not affected by the magnetic field generated by each device. According to this measure, the entire hot water supply device can be made compact. Is inhibited.

  On the other hand, if the arrangement of the flow rate sensor and each device is close to each other, the entire hot water supply device can be made compact. However, due to the influence of the magnetic field generated from each device, the flow rate sensor is connected to the impeller. It is conceivable that the rotational speed is erroneously detected. For this reason, there is a concern that the heat source device may malfunction due to erroneous detection of the flow sensor.

  Therefore, a measure using a magnetic shield for preventing the influence of the magnetic field is considered. This magnetic shield is made of a magnetic material such as iron or nickel, and allows the object to be protected to be protected by allowing the lines of magnetic force in the magnetic field to pass through the member of the magnetic shield. That is, as shown in FIG. 8A, a rectangular plate-shaped magnetic shield 107 is disposed between the magnetic generation source z and the flow sensor x, or as shown in FIG. By surrounding the entire flow sensor x with the magnetic shield 107, the influence of the magnetic field that the flow sensor x can receive from the magnetic source z can be prevented.

However, the magnetic shield x having the above-described shape has a problem in that downsizing of the entire hot water supply apparatus is hindered or maintenance work efficiency is lowered. That is, in order to prevent the influence of the magnetic field using the rectangular magnetic shield x shown in FIG. 8A, a plate having a considerable area is required. That is, according to this measure, since a considerable area for attaching the magnetic shield x is required, downsizing of the entire hot water supply apparatus is hindered.
Further, if the casing-shaped magnetic shield 108 shown in FIG. 8B surrounds the flow sensor x to be protected, maintenance becomes difficult when an abnormality occurs in the flow sensor x, and the maintenance work efficiency is reduced. Reduce.

  Accordingly, in the present invention, in view of the technical problems described above, a magnetic field generated by a magnetic generation source of another device is prevented from reaching the detection device, and each device incorporated in the casing is also subjected to maintenance work. It is an object of the present invention to provide a heat source device and a hot water supply device that can reduce the size of the entire hot water supply device while arranging the efficiency in consideration.

  The invention described in claim 1 for solving the above-described problems includes a combustion means, a fluid path through which a fluid passes, a detection device for detecting information on the fluid passing through the fluid path using magnetism, and a magnetic field. A heat source device capable of controlling the heating of the combustion means based on information detected by the detection device, and having a magnetic shielding member capable of blocking the influence of the magnetic field. The magnetic shielding member is disposed between the detection device and the magnetism generation source, and an imaginary line directed from the end of the magnetic shielding member to the detection device intersects the magnetic shielding member. It is.

  In the heat source device of the present invention, a magnetic shielding member that blocks the influence of a magnetic field is provided between a device (for example, a fan having a motor, a circulation pump, an electromagnetic having a solenoid, etc.) provided with a magnetic generation source and a detection device. It is set as the arrangement. Furthermore, the magnetic shielding member has a relationship in which an imaginary line directed from the end portion toward the detection device intersects the magnetic shielding member.

Here, as a well-known fact, for example, in a bar magnet or a “U” -shaped magnet, the magnetic force is concentrated in the vicinity of the end, and from one end (N pole) to the other end (S pole). ) To form a magnetic field. Further, it is known that the middle of the magnetic field lines is a relatively small magnetic force with respect to the end of the magnetic field lines.
Further, for example, as shown in FIG. 9, when a so-called magnetic material such as iron or nickel is used as a magnetic shielding member, the magnetic shielding member can easily pass a magnetic line of force in the member, and the magnetic line of force is transferred into the member. Can be bypassed. That is, conventionally, a measure has been taken to provide a magnetic shielding member near a protection object such as a detection device so that the magnetic field is not affected by the protection object.

  However, at this time, as shown in FIG. 9, the magnetic shielding member is magnetized by the passage of the lines of magnetic force, and the magnetic shielding member itself becomes magnetized. That is, when the magnetic material is magnetized, the side where the magnetic lines of force are introduced becomes the S pole, the side where the magnetic lines of force are released becomes the N pole, and the magnetic body itself forms the magnetic lines of force to constitute the magnetic field. The protection target object may be affected by the newly formed magnetic field, and the detection device makes a false detection.

Therefore, in the heat source device of the present invention, the magnetic shielding member is arranged between the magnetism generation source and the detection device so that the virtual line from the end of the magnetic shielding member to the detection device intersects the magnetic shielding member. Since the magnetic shielding member is disposed, the detection device is hardly affected by the magnetic field newly formed by the magnetic shielding member.
Specifically, as a configuration satisfying the above condition, for example, as shown in FIG. 2, the “U” -shaped magnetic shielding member 7 is placed with the “U” -shaped concave portion facing the magnetic source z. The both ends of the magnetic shielding member 7 are arranged so as to be located on the magnetic source z side. In other words, the “U” -shaped magnetic shielding member 7 is arranged with the opposite side of the “U” -shaped recess facing the detection device x. At this time, the imaginary line I extending from the end of the magnetic shielding member 7 intersects the magnetic shielding member 7. Thereby, the magnetic field lines J of the magnetic field generated from the magnetic source z pass through the member of the magnetic shielding member 7 on the detection device x side, and therefore the magnetic field from the magnetic source z that can reach the detection device x is blocked. it can. In addition, from the above description, the magnetic shielding member 7 is magnetized by passing the magnetic lines of force J through the member, so that the magnetic shielding member 7 itself generates a magnetic field to form the magnetic lines of force j. However, since the magnetic force line j formed by the magnetic shielding member 7 extends from the end portion directed toward the magnetic source z side to the end portion, the magnetic force line j does not reach the detection device side.

In other words, the heat source device of the present invention has other devices with a configuration in which the magnetic shielding member is arranged so that the imaginary line from the end of the magnetic shielding member to the detection device intersects the magnetic shielding member. Since it is possible to prevent the magnetic field generated by the magnetic source from reaching the detection device, it is possible to prevent malfunction of the device as a result.
Furthermore, since the heat source device of the present invention does not require an area of the magnetic shielding member to be unnecessarily large as in the prior art described above, the mounting area of the magnetic shielding member can be minimized. Moreover, since it is not necessary to enclose the whole detection apparatus with a magnetic shielding member, it can arrange | position in consideration of the work efficiency of the maintenance of each apparatus etc. with which the heat source apparatus was equipped. That is, according to the present invention, it is possible to provide a heat source device capable of reducing the overall size of the device while arranging the devices in consideration of maintenance.

  In the heat source device of the present invention, the magnetic shielding member is a plate body, is shielded to be disposed opposite to the magnetic generation source, and is bent in a direction orthogonal to the shielding unit, toward the magnetic generation source side. It is desirable that the bent portion is positioned at both ends of the shielding portion. (Claim 2)

  According to this structure, the magnetic shielding member is comprised by the shielding part and the bending part distribute | arranged to the both ends. The bent portion is bent in a direction orthogonal to the shielding portion and extends toward the magnetic source side. As a result, the lines of magnetic force extending from the end of the magnetic shielding member hardly reach the detection device side, so that the detection device can perform its original function more accurately.

  In the heat source device of the present invention, it is preferable that the end portions of the bent portions are bent in a direction approaching each other. (Claim 3)

  According to such a configuration, since the end portions of the magnetic shielding member are bent in a direction approaching each other, a magnetic field formed by the end portions is located on the intermediate side of the shielding portion. Specifically, for example, as shown in FIG. 3, the base portion side of the bent portion 7b is further bent at a right angle so that the bent portion 7b is substantially parallel to the shielding portion 7a. As a result, the magnetic force lines j of the magnetic field generated from the magnetic shielding member 7 are blocked by the shielding part 7a because almost all of the magnetic force lines j that can be extended to the detection device side are affected by the magnetic field generated by the magnetic shielding member 7. It can be prevented from reaching the detection device. That is, according to the present invention, the magnetic field in the magnetism generation source can be more reliably interrupted.

  In the heat source device of the present invention, it is desirable that the magnetic shielding member is formed by coating the surface of a magnetic material with a non-magnetic material. (Claim 4)

  According to such a configuration, since the surface of the magnetic shielding member is covered with the non-magnetic material, even when the magnetic shielding member is composed of the magnetic material, the magnetic shielding member itself is oxidized, and the shielding effect is obtained. It can be prevented from decreasing.

  A fifth aspect of the present invention is a hot water supply device having a hot water discharge function for discharging heated hot water directly or mixed with other hot water, comprising the heat source device according to any one of the first to fourth aspects. This is a hot water supply device.

  A hot water supply apparatus according to the present invention includes the heat source apparatus according to any one of claims 1 to 4. In other words, according to the present invention, it is possible to provide a hot water supply device in which a magnetic field generated by a magnetic source included in another device hardly reaches the detection device. In addition, the hot water supply apparatus of the present invention can reduce the size of the entire apparatus while arranging the devices incorporated in the casing in consideration of the maintenance work efficiency.

  According to the heat source device and the hot water supply device of the present invention, the end of the magnetic shielding member is bent toward the magnetism generation source, so that the magnetic field generated by the magnetism generation source hardly reaches the detection device. As a result, it is possible to reduce the overall size of the apparatus while arranging the devices incorporated in the casing in consideration of the maintenance work efficiency.

It is an operation | movement principle figure which shows the hot water supply apparatus provided with the heat-source apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the magnetic shielding member employ | adopted as this embodiment. It is explanatory drawing which shows the modification of a magnetic shielding member. It is explanatory drawing which shows the modification of a magnetic shielding member. It is a perspective view which shows the attachment condition of the magnetic shielding member of FIG. It is a perspective view which shows the attachment condition of the magnetic shielding member of FIG. It is a perspective view which shows the attachment condition of the magnetic shielding member of FIG. It is explanatory drawing which shows the conventional magnetic shielding member, (a) shows a linear magnetic shielding member, (b) has shown the housing-shaped magnetic shielding member. It is explanatory drawing shown about an effect | action at the time of a magnetic force line passing through a magnetic body.

  Then, the hot water supply apparatus 1 which concerns on embodiment of this invention is demonstrated in detail, referring drawings. In the following description, the positional relationship between the top, bottom, left and right will be described with reference to the drawings unless otherwise specified.

  As shown in FIG. 1, the hot water supply device 1 includes, in a hot water supply device body (casing) 4, a combustion unit 2, a primary heat exchanger 11 that exchanges heat between the combustion gas generated in the combustion unit 2 and hot water, A secondary heat exchanger 12 that is located downstream of the primary heat exchanger 11 in the flow direction of the combustion gas and further exchanges heat between the combustion gas and a heat medium such as hot water, and an air supply unit that supplies air to the combustion unit 2 10 and a combustion device (combustion means) H provided with an exhaust section 6 that discharges combustion gas that has passed through the secondary heat exchanger 12 to the outside, and hot water heated by the combustion device H is supplied to the outside. A so-called latent heat recovery type of a flowing water system L constituted by piping, a fuel system G for supplying fuel to the combustion device H, and a control means C for controlling the combustion device H, etc. This is a hot water supply device 1. The heat source device P refers to a device constituted by the combustion device H, the fuel system G, and the control means C.

  The combustion unit 2 includes a burner 15 that burns fuel gas supplied from the outside and a combustion space 16. The burner 15 burns fuel gas supplied from the outside, and a plurality of combustion pipes 18 are provided side by side. The burner 15 is connected to a fuel system G for supplying fuel gas.

  The fuel system G includes a fuel supply pipe 17 connected to the burner 15, and an original gas solenoid valve 21, a gas proportional valve 22, and a solenoid valve 23 are provided in the middle of the fuel system G. The original gas solenoid valve 21 and the gas proportional valve 22 are provided to adjust the amount of fuel supplied to the burner 15. The original gas solenoid valve 21, the gas proportional valve 22, and the solenoid valve 23 have a solenoid (magnetic source) (not shown) and operate when energized and generate a magnetic field.

  The burner 15 can adjust the amount of combustion by adjusting the opening of the gas proportional valve 22 and adjusting the amount of fuel supplied. The burner 15 can also change the combustion amount in stages by changing the number of the combustion pipes 18 that perform the combustion operation. That is, the burner 15 can change the number of bases of the combustion pipe 18 to which the fuel gas is supplied stepwise by the electromagnetic valve 23 provided in the middle of the fuel supply pipe 17.

The flowing water system L includes a water passage (fluid path) 19 connected to the primary heat exchanger 11 or the secondary heat exchanger 12.
The water flow path 19 is a flow path through which hot water (heat medium) flows, and an inflow side pipe 31 and an outflow side pipe 32 provided in the hot water supply apparatus body 4 and water supply (not shown) connected to these pipes 31 and 32. It consists of a pipe and a hot water supply pipe. The inflow side pipe 31 and the outflow side pipe 32 are bypassed by a bypass pipe 35. In addition, since the secondary heat exchanger 12 and the primary heat exchanger 11 are connected by the connection pipe 36, the connection pipe 36 functions as an outflow side with respect to the secondary heat exchanger 12, and the primary heat exchanger It functions as an inflow side for the exchanger 11.

  The inflow side pipe 31 is a pipe for supplying hot water supplied from an external water supply source through a water supply pipe (not shown) to the secondary heat exchanger 12 and the primary heat exchanger 11. In the middle of the inflow side piping 31, a flow rate sensor (detection device) 13a and a incoming water temperature sensor 14a are provided. The flow rate sensor 13 a detects the amount of hot water supplied from the outside via the inflow side pipe 31. The incoming water temperature sensor 14a detects the temperature of hot water supplied from the outside. The flow rate sensor 13a and the incoming water temperature sensor 14a are located downstream of the connecting portion of the bypass pipe 35 in the inflow side pipe 31 in the flowing direction of the hot water and are connected to the control device 20 described later.

  The outflow side pipe 32 supplies high-temperature hot water heated by heat exchange with the combustion gas in the primary heat exchanger 11 to the heat load 24. Examples of the thermal load 24 include those using hot water itself such as a bathtub or a hot water tap, in addition to those using the thermal energy of hot water such as a heating device represented by a fan convector. .

  A water amount adjusting valve 26c and a hot water temperature sensor 14c are provided in the middle of the outflow side pipe 32 and upstream of the connecting portion of the bypass pipe 35 in the hot water flow direction. The water amount adjustment valve 26c adjusts the flow rate of hot hot water flowing downstream from the water amount adjustment valve 26c by opening and closing the flow path of the outflow side pipe 32. The hot water temperature sensor 14 c detects the temperature of hot water supplied to the thermal load 24 through the outflow side pipe 32. The water amount adjustment valve 26c includes a motor (magnet generation source) (not shown), and a magnetic field is generated by a permanent magnet of the motor.

  The bypass pipe 35 supplies hot water that is not heated from a water supply pipe (not shown) to the outflow side pipe 32. In the middle of the bypass pipe 35, a bypass flow rate sensor (detection device) 13b and a bypass water amount adjustment valve 26b are provided. That is, the flow rate of the unheated hot water supplied to the outflow side pipe 32 is adjusted by opening and closing the flow path of the bypass pipe 35 by the bypass water amount adjusting valve 26b. The bypass water amount adjusting valve 26b includes a motor (magnetic generation source) (not shown), and a magnetic field is generated by a permanent magnet included in the motor.

  The air supply unit 10 includes a fan 37 therein, and can change the rotation speed in accordance with the combustion state of the burner 15 to adjust the blowing amount and the blowing pressure. The fan 37 has a motor (magnetic source) (not shown), and a magnetic field is generated by a permanent magnet of the motor.

  The exhaust part 6 is a part that discharges the combustion gas that has passed through the first heat exchanger 11 and the second heat exchanger 12.

  The control means C controls the operation of the hot water supply device 1 of the present embodiment, and includes a control device 20 and a remote controller 26.

  Here, in the hot water supply device 1 of the present embodiment, the water amount sensors 13a and 13b are configured by the impeller rotors 41a and 41b and the magnetic sensors 42a and 42b having magnetoresistive elements. Yes. That is, the water amount sensors 13a and 13b detect changes in the magnetic field caused by the rotation of the magnetized impeller by the magnetic sensors 42a and 42b, generate pulse signals, and flow rates of hot water passing through the pipes. Is calculated.

In addition, as described above, the original gas solenoid valve 21, the gas proportional valve 22, the solenoid valve 23, the fan 37, the water amount adjustment valve 26c, and the bypass water amount adjustment valve 26b are provided with a solenoid or a motor (magnetic source) (not shown). Both have a magnetic field.
That is, in the case where the water heaters 13a and 13b and devices equipped with a magnetic generation source are built in the same hot water supply device body 4, the water sensors 13a and 13b are magnetic fields of the rotors 41a and 41b by the magnetic sensors 42a and 42b. In addition to detecting changes in the magnetic field, the magnetic field of the magnetic source may be erroneously detected.

  Therefore, in the hot water supply apparatus 1 of the present embodiment, the magnetic shielding member 7 is provided between the water amount sensors 13a and 13b and the device having the magnetic generation source arranged in the vicinity of the water amount sensors 13a and 13b. Yes.

Next, the magnetic shielding member 7 will be specifically described with reference to the drawings.
Hereinafter, the flow sensor 13 will be described as a protection target x, and a device (electromagnetic valve) having a magnetic generation source as a magnetic generation source z, with reference to FIGS.

First, the configuration of the magnetic shielding member 7 will be described.
The magnetic shielding member 7 is made of a magnetic material such as iron or cobalt, and prevents the magnetic field from affecting the object to be protected x by allowing the magnetic field lines in the magnetic field to pass through the member. In addition, the magnetic shielding member 7 of the present embodiment is coated with a nonmagnetic material such as zinc or tin around the magnetic material, and the magnetic material itself is prevented from being oxidized by the covering portion. Thereby, it can reduce that the magnetic shielding member 7 is oxidized and a function falls.

  The magnetic shielding member 7 is obtained by bending a plate, and has a shielding part 7a and a bent part 7b. That is, the bent portion 7b is formed so as to be positioned at both ends of the shielding portion 7a. Specifically, the magnetic shielding member 7 is formed in a “U” shape.

  The magnetic shielding member 7 is fixed to the pipe, the hot water supply device main body 4 and the like, and is fixed using a nonmagnetic fixing member 29. In the present embodiment, the configuration in which the magnetic shielding member 7 is fixed using the non-magnetic fixing member 29 is shown, but the present invention is not limited to this configuration. For example, when spot welding or the like is used as the fixing means, a member made of a magnetic material can be used as long as the fixing unit and the flow rate sensor 13 are separated to the extent that the magnetic field is not affected by the fixing unit of the magnetic shielding unit 7. It may be used and fixed.

Further, in the magnetic shielding member 7, the size of the shielding part 7a is larger than the projected area of the protection target x. That is, when the shielding part 7a is arranged facing the protection object x, the shielding part 7a can hide the entire protection object x when viewed from the opposite side of the protection object x with the shielding part 7a interposed therebetween. It is about the size. In other words, the area of the shielding part 7a is made larger than the projected area of the protection object x projected on the shielding body 7a.
The bent portion 7b is bent so as to be substantially orthogonal to the shielding portion 7a, and the size of the bent portion 7a is sufficiently smaller than the size of the shielding portion 7a.

Next, the positional relationship among the magnetic shielding member 7, the protection object x, and the magnetic generation source z will be described.
As described above, the magnetic shielding member 7 having the above-described configuration is arranged between the protection target x and the magnetic generation source z, and as shown in FIG. The concave side of the letter is oriented in the direction in which the magnetic source z is located. Specifically, the shielding part 7a faces both the protection object x and the magnetic generation source z (one surface of the shielding part 7a faces the protection object x and the other surface is the magnetic generation source z). And the bent portion 7b is arranged so that the end portion faces the magnetic source z side. In other words, the protection object x is located on the side facing the side where the bent part 7b is arranged with the shielding part 7a as a boundary. Furthermore, when the straight virtual line I is extended from the end of the bent part 7b to the protection target x, the virtual line I intersects the shielding part 7a. In addition, depending on arrangement | positioning of the protection target object x and the magnetic generation source z, you may arrange | position the magnetic shielding member 7 as shown in FIG. Also at this time, the above-mentioned conditions must be satisfied.

Next, the operation of the magnetic shielding member 7 will be described.
A device (solenoid valve) provided with a magnetic source z generates a magnetic field by energization (solenoid), and a magnetic force line J is formed as shown by a thick two-dot chain line in FIG. Since the magnetic shielding member 7 is made of a magnetic material as described above, the magnetic lines of force J pass through the inside of the member. As a result, the magnetic shielding member 7 becomes magnetized, and a magnetic field line j is also formed from the magnetic shielding member 7 as a derivative.

Here, as a well-known fact, in a magnet, it is known that the magnetic force concentrates on the end side, and it can be considered that the magnetic shielding member 7 having magnetism is also concentrated on the end side. . That is, in the magnetic shielding member 7 employed in the present embodiment, a magnetic force line j is formed as shown by a thin two-dot chain line in FIG. For this reason, according to the hot water supply device 1 of the present embodiment, both the magnetic field generated from the magnetic source z and the magnetic field that is derived by blocking the magnetic field of the magnetic source z by the magnetic shielding member 7 are obtained. It is possible to block the magnetic field. Thereby, it is prevented that the protection target object x erroneously detects a magnetic field generated from another device and causes the water heater 1 to malfunction.
Further, since the magnetic shielding member 7 can block the magnetic field if the size of the shielding part 7a is larger than the area where the protection object x is projected, as shown in FIGS. However, the size of the shielding part 7a can be reduced. That is, since the magnetic shielding member 7 can be reduced in overall shape, the installation area can be minimized.

Therefore, in the hot water supply device 1 provided with the magnetic shielding member 7 having the above-described configuration, even if a device having a magnetic generation source is incorporated in the same hot water supply device body 4, the magnetic field generated by the magnetic generation source is detected by the flow sensor (detection). Device) 13 is almost eliminated.
Further, in the hot water supply device 1 of the present embodiment, the magnetic shielding member 7 is installed even when the flow rate sensor 13 and the magnetic generation source are arranged close to each other and the magnetic shielding member 7 is attached between them. Since the area can be minimized, as a result, the entire hot water supply apparatus 1 can be made compact. Further, since the magnetic shielding member 7 is disposed between the flow sensor 13 and the magnetic generation source, the magnetic field from the magnetic generation source can be surely interrupted. The arrangement can be considered.

In the said embodiment, although the structure which orient | assigned the edge part of the bending part 7b in the magnetic shielding member 7 to the magnetism generation source was shown, this invention is not limited to this, As shown to FIG. 7 may be configured so that the end portions of the bent portions 7b face each other. Specifically, the base end side of the bent portion 7b is further bent at a right angle so that the bent portion 7b is substantially parallel to the shielding portion 7a. Thereby, it becomes the arrangement | positioning where the edge parts of the bending part 7b face each other. At this time, similarly to the above embodiment, the imaginary line I from the end of the bent portion 7b toward the flow sensor 13 intersects the shielding portion 7a.
By adopting such a configuration, the magnetic field in the magnetic shielding member 7 that is derivatively generated by shutting off the magnetic generation source can be generated almost in the middle of the shielding portion 7a. High blocking effect.

  In the said embodiment, although the structure which has arrange | positioned the magnetic shielding member 7 between the flow sensor 13 and the magnetic generation source was shown, this invention is not limited to this, The flow sensor which the heat-source apparatus P detects the flow of a fluid In the case of providing (air volume sensor, gas volume sensor, etc.), the magnetic shielding member 7 may be arranged between the flow sensor and the magnetic generation source. In short, any object can be protected by the magnetic shielding member 7 as long as the object to be protected is a device that detects using magnetism.

  In the said embodiment, although the structure of the shape which bent the both ends side of the magnetic shielding member 7 so that a corner | angular shape was formed was shown, this invention is not limited to this, As shown in FIG. May be configured to be curved as a whole. Also in this case, it is necessary to provide the magnetic shielding member 7 so that an imaginary line from the end of the magnetic shielding member 7 to the protection target intersects the magnetic shielding member 7.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

The magnetic shielding member 7 shown in FIG. 7 having the following configuration was formed.
Steel plate plated with aluminum (processing ready-made products)
Member thickness t 0.6mm
Overall length H (reference to Fig. 7) 70mm
Overall lateral length W (reference to FIG. 7) 50 mm
Vertical length h ₁ of shielding part (reference to FIG. 7) 70 mm
Horizontal length w ₁ of shielding part (reference to FIG. 7) 50 mm
Folded part length h ₂ (reference to Fig. 7) 70mm
Bending length w ₂ (reference to Fig. 7) 10mm

As a comparative example to be compared with the magnetic shielding member 7 of the example, a magnetic shielding member shown in FIG. 8A having the following configuration was prepared.
Steel plate plated with aluminum (processing ready-made products)
Member thickness 0.6mm
Overall longitudinal length H (reference to FIG. 8 (a), vertical length on the paper surface) 70mm
Overall lateral length W (reference to FIG. 8 (a), vertical length) 50mm

The above-described embodiment and the comparative example are different in whether or not the bent portion 7b is provided.
The example and the comparative example were attached between the flow rate sensor 13 and the magnetic generation source under the same conditions, and the operation of the hot water supply device 1 was confirmed multiple times. In the magnetic shielding member of the comparative example, a strong magnetic field was confirmed in the vicinity of the flow sensor 13 and a malfunction was sometimes confirmed. However, in the magnetic shielding member 7 of the example, the magnetic field was hardly confirmed in the vicinity of the flow sensor 13. No malfunction was confirmed.

1 Hot-water supply device 4 Hot-water supply device body (casing)
7 Magnetic shielding member 7a Shielding part 7b Bending part 13 Flow rate sensor (detection device)
I Virtual line P Heat source device x Protection target z Magnetic source

Claims (5)

Combusting means, a fluid path through which the fluid passes, a detection device that detects information on the fluid that passes through the fluid path using magnetism, and a magnetic source that generates a magnetic field are detected by the detection device. A heat source device capable of controlling the heating of the combustion means based on the information,
Having a magnetic shielding member capable of blocking the influence of a magnetic field;
The magnetic shielding member is disposed between a detection device and a magnetic generation source, and a virtual line from the end of the magnetic shielding member toward the detection device intersects the magnetic shielding member.   The magnetic shielding member is a plate body, a shielding portion disposed to face the magnetic generation source, a bent portion that is bent in a direction orthogonal to the shielding portion and extends toward the magnetic generation source side. The heat source device according to claim 1, wherein the bent portion is positioned at both ends of the shielding portion.   The heat source device according to claim 2, wherein end portions of the bent portions are bent in a direction approaching each other.   4. The heat source device according to claim 1, wherein the magnetic shielding member has a surface of a magnetic material covered with a non-magnetic material. A hot water supply apparatus having a hot water discharge function for discharging heated hot water directly or mixed with other hot water,
A hot water supply device comprising the heat source device according to any one of claims 1 to 4.

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