JP2020118350A - Instantaneous heat exchanger and sanitary cleaning device - Google Patents

Abstract

To provide an instantaneous heating exchanger that can prevent boiling noise or scale from occurring due to the locally raised surface temperature of a heating body even in a case where the heating body is downsized, and a sanitary cleaning device.SOLUTION: An instantaneous heat exchanger that heats water to hot water, comprises: a heating body that heats water; and a case that covers the outer periphery of the heating body and forms a flow passage for flowing water to be heated by the heating body between itself and the heating body, wherein in at least one of the heating body and the flow passage, an average heating amount per unit amount of water flowing on the upstream side of the flow passage is larger than an average heating amount per unit amount of water flowing on the downstream side of the flow passage.SELECTED DRAWING: Figure 1

Description

Aspects of the present invention relate to instant heat exchangers and sanitary washing devices.

2. Description of the Related Art There is known a sanitary washing device that is attached to a stool-type toilet bowl to wash local areas such as a user's buttocks. In such a sanitary washing device, a low silhouette design in which the height is kept low is required, and it is necessary to downsize each unit constituting the sanitary washing device.

When the heating element is downsized in the instantaneous heat exchanger, the heat transfer area becomes small. Therefore, in order to obtain the same amount of heating as that before the miniaturization, the surface temperature of the heating element must be raised, which increases the risk of scale generation on the heating element surface. Therefore, it is necessary to increase the heat exchange efficiency in order to lower the surface temperature of the heater while keeping the hot water at the desired temperature.

As a method of increasing the heat exchange rate, in order to increase the flow velocity of water in contact with the heating element, it is conceivable to form the outer flow path and the inner flow path of the cylindrical heating element in a spiral shape. For example, in Patent Document 1, in order to configure the inner flow path of the cylindrical heating element in a spiral shape, a hollow core of the cylindrical heating element has a shaft core member having a spiral protrusion, and a cylindrical shape. There is disclosed an instantaneous heat exchanger including a flexible member (spring) that fills a gap between the inner peripheral surface of the heating element and the shaft core member.

JP, 2017-180913, A

However, the temperature of the heating element has a temperature distribution such that the temperature is low on the upstream side in contact with cold water and high on the downstream side in contact with hot water. Therefore, even if the temperature of the entire heating element is lowered by increasing the heat exchange rate as in Patent Document 1, there is a possibility that boiling noise or scale may be generated at a locally high temperature location.

The present invention has been made based on the recognition of such a problem, and even when the heating element is miniaturized, the surface temperature of the heating element is locally increased, and boiling noise or scale may occur. An object is to provide an instantaneous heat exchanger and a sanitary washing device that can be suppressed.

A first aspect of the present invention is an instantaneous heat exchanger that heats water into hot water, which is for heating a water heating element and for flowing water heated by the heating element to cover an outer periphery of the heating element. A case in which a flow path is formed between the heating element and at least one of the heating element and the flow path, wherein an average heating amount per unit amount of water flowing upstream of the flow path is It is an instantaneous heat exchanger characterized by making it larger than the average heating amount per unit amount of water flowing in the downstream side of the flow path.

According to this instantaneous heat exchanger, since the average heating amount per unit amount of water is large on the upstream side in contact with cold water, it is possible to easily heat the heating element to warm water of a desired temperature even if the heating element is downsized. Further, since the average amount of heating per unit amount of water is small on the downstream side that comes into contact with hot water, it is possible to prevent the surface temperature of the heating element from becoming too high. Therefore, even if the heating element is downsized, it can be heated to hot water having a desired temperature, and the surface temperature of the heating element is locally increased, and it is possible to suppress the generation of boiling noise and scale.

In a second aspect based on the first aspect, the heating element has a heater wire provided in a predetermined heater pattern, and the density of the heater wire on the upstream side of the flow path is the downstream side of the flow path. The instant heat exchanger is characterized in that the density is higher than the density of the heater wire on the side.

According to this instantaneous heat exchanger, the density of the heater wire on the upstream side of the flow path is made higher than the density of the heater wire on the downstream side of the flow path, so that the unit amount of water flowing on the upstream side of the flow path is increased. The average heating amount per unit can be appropriately made larger than the average heating amount per unit amount of water flowing on the downstream side of the flow path.

A third aspect of the invention is the instantaneous heat exchanger according to the first or second aspect of the invention, wherein the upstream cross-sectional area of the flow path is larger than the downstream cross-sectional area of the flow path. ..

According to this instantaneous heat exchanger, by making the cross-sectional area on the upstream side of the flow path larger than the cross-sectional area on the downstream side of the flow path, the average heating per unit amount of water flowing in the upstream side of the flow path is increased. The amount can be appropriately larger than the average heating amount per unit amount of water flowing on the downstream side of the flow path.

In a fourth invention according to any one of the first to third inventions, at least one of the heating element and the flow channel is configured so that an average heating amount per unit amount of water flowing through the flow channel is from an upstream side. It is an instantaneous heat exchanger characterized by gradually decreasing toward the downstream side.

According to this instantaneous heat exchanger, at least one of the heating element and the flow path, by gradually reducing the average heating amount per unit amount of water flowing through the flow path from the upstream side to the downstream side, It is possible to more appropriately suppress the occurrence of boiling noise and scale caused by locally increasing the surface temperature of the heating element.

5th invention is provided with the instantaneous heat exchanger of any one of 1st-4th invention, and the nozzle which discharges the hot water produced by the said instantaneous heat exchanger toward a user's local area. It is a sanitary washing device characterized by that.

According to this sanitary washing device, since the average heating amount per unit amount of water is large on the upstream side in contact with cold water, it is possible to easily heat the heating element to warm water of a desired temperature even if the heating element is downsized. Further, since the average heating amount per unit amount of water is small on the downstream side that comes into contact with the hot water, it is possible to prevent the surface temperature of the heating element from becoming too high. Therefore, even if the heating element is downsized, it can be heated to hot water having a desired temperature, and the surface temperature of the heating element is locally increased, which can suppress the generation of boiling noise and scale.

According to the aspect of the present invention, even when the heating element is downsized, the surface temperature of the heating element is locally increased, and it is possible to suppress the occurrence of boiling noise and scale, and an instantaneous heat exchanger and hygiene. A cleaning device is provided.

It is sectional drawing which represents typically the instantaneous heat exchanger which concerns on 1st Embodiment. It is an expanded sectional view showing typically a part of instantaneous heat exchanger concerning a 1st embodiment. It is an expanded sectional view showing typically a part of instantaneous heat exchanger concerning a 1st embodiment. It is a top view which represents typically an example of the heater part of a heat generating body. FIG. 5A and FIG. 5B are enlarged cross-sectional views schematically showing modified examples of the instantaneous heat exchanger according to the first embodiment. It is a perspective view showing typically the toilet device concerning a 2nd embodiment. It is a block diagram showing typically the sanitary washing device concerning a 2nd embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In order to facilitate understanding, the same components in the drawings will be denoted by the same reference symbols as much as possible, without redundant description.

(First embodiment)
FIG. 1 is a cross-sectional view schematically showing the instantaneous heat exchanger according to the first embodiment.
As shown in FIG. 1, the instantaneous heat exchanger 10 includes a heating element 12 and a case 14. The instantaneous heat exchanger 10 (hereinafter referred to as the heat exchanger 10) according to the present embodiment warms water to make hot water, and is installed in, for example, a stool-type toilet bowl or the like to wash a local part of a human body. It is equipped with a sanitary washing device that is used to heat wash water.

The heating element 12 has a cylindrical shape having a hollow portion 12a. In other words, the heating element 12 is a cylindrical heater. The heating element 12 does not need to be a perfect cylinder, and may have a portion whose thickness changes. The cross-sectional shape of the heating element 12 does not need to be a perfect circle, and may have an elliptical part or a polygonal part in part. The heating element 12 may have a substantially cylindrical outer shape.

The heating element 12 is, for example, a cylindrical ceramics heater. The heating element 12 includes, for example, an outer portion forming the outer peripheral surface 12b of the heating element 12, an inner portion forming the inner peripheral surface 12c of the heating element 12, and a heater portion provided between the inner portion and the outer portion. And. The inner part and the outer part are made of ceramics. The heater portion is, for example, a film shape in which a band-shaped heater pattern made of tungsten or the like is sandwiched by insulating films. As a result, in the heating element 12, the water in contact with the outer peripheral surface 12b and the inner peripheral surface 12c can be heated.

The case 14 covers the outer circumference of the heating element 12. The case 14 includes, for example, a case body 20 and a lid portion 22. The case body 20 covers the outer circumference of the heating element 12. The case body 20 has, for example, a cylindrical shape having a diameter larger than that of the heating element 12. The case body 20 has a hollow portion 20a that houses the heating element 12. The heating element 12 is arranged, for example, substantially coaxially within the hollow portion 20a of the cylindrical case body 20.

However, the shape of the case body 20 may be any shape capable of covering the outer periphery of the heat generating element 12. For example, the case body 20 may have a rectangular parallelepiped shape having a cylindrical hollow portion 20a capable of accommodating the heating element 12.

One end of the heating element 12 is located inside the one end of the case body 20. In other words, one end of the heating element 12 is located inside the hollow portion 20a. On the other hand, the other end of the heating element 12 is located outside the other end of the case body 20. However, the other end of the heating element 12 may be located inside the other end of the case body 20.

The lid 22 is provided at one end of the case body 20 on the side where the heating element 12 does not project, and closes one end of the cylindrical case body 20. The lid 22 may be integrally formed with the case body 20, for example. The hollow portion 20a may have a bottomed hole shape with one end closed, for example. The case 14 may have a configuration in which the heating element 12 is housed by a hollow portion 20a having a bottomed hole shape.

The heat exchanger 10 further includes a shaft core member 16 and a coil spring 18. The shaft core member 16 is provided in the hollow portion 12 a of the heating element 12. The shaft core member 16 is formed separately from the case 14, and is not fixed to the case 14. The shaft core member 16 is, for example, a substantially columnar shape that extends in the axial direction of the heating element 12, and is arranged substantially coaxially inside the hollow portion 12 a of the cylindrical heating element 12.

Further, one ends of the heating element 12 and the shaft core member 16 are arranged apart from the case 14. More specifically, one ends of the heating element 12 and the shaft core member 16 are arranged apart from the lid portion 22 of the case 14. The space between the heating element 12 and one end of the shaft core member 16 and the lid portion 22 serves as a path for flowing water between the inside and outside of the heating element 12.

The coil spring 18 is provided between the shaft core member 16 and the inner peripheral surface 12c of the heating element 12. The coil spring 18 is made of metal or resin, for example. The outer diameter of the coil spring 18 in the natural length state is slightly larger than the inner diameter of the inner peripheral surface 12c of the heating element 12. The coil spring 18 is provided in the hollow portion 12a of the heating element 12 in a state where the coil spring 18 has a slightly reduced diameter by being twisted. As a result, the coil spring 18 comes into contact with the inner peripheral surface 12c of the heating element 12 and is held in the hollow portion 12a of the heating element 12 by its own elastic force that attempts to return the diameter.

FIG. 2 is an enlarged cross-sectional view schematically showing a part of the instantaneous heat exchanger according to the first embodiment.
As shown in FIGS. 1 and 2, the case body 20 of the case 14 forms an outer flow path 30 between itself and the outer peripheral surface 12 b of the heating element 12. That is, the case 14 covers the outer periphery of the heating element 12 and forms the outer flow path 30 for flowing the water heated by the heating element 12 between the case 14 and the heating element 12. The case body 20 has a protrusion 20b. The protruding portion 20 b protrudes inward from the inner peripheral surface of the case body 20, and extends spirally along the axial direction of the case body 20.

The heat exchanger 10 further includes a coil spring 24. The coil spring 24 is provided between the case body 20 and the outer peripheral surface 12b of the heating element 12. The coil spring 24 is made of metal or resin, for example. The inner diameter of the coil spring 24 in the natural length state is slightly smaller than the outer diameter of the outer peripheral surface 12b of the heating element 12. The coil spring 24 is provided on the outer peripheral surface 12b of the heating element 12 in a state where the coil spring 24 has a slightly increased diameter by being twisted. As a result, the coil spring 24 comes into contact with the outer peripheral surface 12b of the heating element 12 and is held on the outer peripheral surface 12b of the heating element 12 by its own elastic force that attempts to return the diameter.

The inner diameter of the case body 20 at the tip portion of the protruding portion 20b of the case body 20 is slightly larger than the outer diameter of the outer peripheral surface 12b of the heating element 12. Therefore, there is a slight gap between the case body 20 and the heating element 12.

The thickness (diameter) of the wire of the coil spring 24 is larger than the distance of the gap formed between the case body 20 and the heating element 12. The pitch of the coil springs 24 is substantially the same as the pitch of the spiral protrusions 20b. As a result, the coil spring 24 closes the gap between the case body 20 and the outer peripheral surface 12b of the heating element 12.

The heating element 12 is supported by, for example, the case body 20 (case 14 ), and is arranged substantially coaxially within the hollow portion 20 a of the cylindrical case body 20.

As a result, the projecting portion 20b of the case body 20 and the coil spring 24 form a spiral outer flow path 30. By thus forming the outer flow path 30 in a spiral shape, the heat exchange rate between the water flowing through the outer flow path 30 and the heat generating element 12 can be increased. Further, by forming the spiral outer flow passage 30 by using the coil spring 24, it is possible to suppress the influence of an assembly error, a dimensional error, and the like by the coil spring 24, and to easily form the spiral outer flow passage 30. ..

FIG. 3 is an enlarged cross-sectional view schematically showing a part of the instantaneous heat exchanger according to the first embodiment.
As shown in FIGS. 1 and 3, the shaft core member 16 forms an inner flow path 32 between itself and the inner peripheral surface 12 c of the heating element 12. The shaft core member 16 has a protrusion 16a. The protruding portion 16 a protrudes outward from the outer peripheral surface of the shaft core member 16 and extends spirally along the axial direction of the shaft core member 16.

The outer diameter of the shaft core member 16 at the tip portion of the protruding portion 16a of the shaft core member 16 is slightly smaller than the inner diameter of the inner peripheral surface 12c of the heating element 12. Therefore, there is a slight gap between the shaft core member 16 and the heating element 12.

The thickness (diameter) of the wire of the coil spring 18 is larger than the distance of the gap between the shaft core member 16 and the heating element 12. The pitch of the coil springs 18 is substantially the same as the pitch of the spiral protrusions 16a. As a result, the coil spring 18 closes the gap between the shaft core member 16 and the inner peripheral surface 12c of the heating element 12.

The shaft core member 16 is not directly supported by the heating element 12 and the case main body 20 (case 14 ), but is supported by the heating element 12 via the coil spring 18 and has a cylindrical heat generation via the coil spring 18. It is arranged substantially coaxially within the hollow portion 12a of the body 12. That is, the shaft core member 16 is positioned by the coil spring 18 without being positioned by the case 14.

As a result, the spiral inner flow path 32 is formed by the projecting portion 16a of the shaft core member 16 and the coil spring 18. By thus forming the inner flow path 32 in a spiral shape, the heat exchange rate between the water flowing through the inner flow path 32 and the heat generating element 12 can be increased. Further, by forming the spiral inner flow passage 32 by using the coil spring 18, it is possible to suppress the influence of an assembly error, a dimensional error, and the like by the coil spring 18, and to easily form the spiral inner flow passage 32. ..

As shown in FIG. 1, the water-passing member 2 for flowing water into the hollow portion 12 a of the heat-generating body 12 is connected to the other end of the heat-generating body 12 projecting outward from the other end of the case body 20. There is. Further, the case body 20 is provided with a water passage port 20c for flowing water into the hollow portion 20a of the case body 20. The water passage port 20c is provided in the case body 20 at an end portion on the same side as the end portion of the heating element 12 to which the water passage member 2 is connected.

In the heat exchanger 10, for example, water is supplied from the water passage member 2 into the hollow portion 12a of the heating element 12. The water supplied into the hollow portion 12a flows through the inner channel 32 toward the end portion on the opposite side of the heating element 12. At this time, the water flowing through the inner flow path 32 comes into contact with the inner peripheral surface 12 c of the heating element 12 and is heated by the heating element 12. The water flowing through the inner flow passage 32 enters the outer flow passage 30 through the space between the end portion of the heating element 12 and the lid portion 22 in the hollow portion 20 a of the case body 20, and the water flows through the outer flow passage 30. Flowing The water flowing through the outer flow path 30 heads toward the opposite end of the heating element 12 again. At this time, the water flowing through the outer flow path 30 is heated by the heating element 12 by coming into contact with the outer peripheral surface 12b of the heating element 12. Then, the water flowing through the outer flow path 30 is discharged to the outside of the case main body 20 (heat exchanger 10) via the water passage port 20c.

As a result, the water supplied to the heat exchanger 10 via the water-passing member 2 is heated by the heating element 12 and replaced with hot water, and the hot water is discharged from the heat exchanger 10. Note that, contrary to the above, water may be supplied from the water passage port 20c and the generated warm water may be discharged to the water passage member 2.

A power supply terminal 12d for supplying electric power to the heater portion of the heat generating body 12 is provided at the other end of the heat generating body 12 protruding outside the other end of the case body 20. In this way, the power supply terminal 12d is provided at the end opposite to the end in contact with water. This suppresses the water supply to the power supply terminal 12d. A plurality of power supply terminals 12d are arranged side by side around the cylindrical heating element 12, for example.

FIG. 4 is a plan view schematically showing an example of the heater section of the heating element.
FIG. 4 schematically shows an example of the heater section 40 provided on the heating element 12. As described above, the heater portion 40 is, for example, in the shape of a film, and is provided between the ceramic inner portion and the outer portion. FIG. 4 schematically shows a state in which the heater portion 40 that is provided by being rolled into a cylindrical shape is flatly developed for convenience. In FIG. 4, the lateral direction of the paper corresponds to the axial direction of the heating element 12, and the vertical direction of the paper corresponds to the circumferential direction of the heating element 12.

As shown in FIG. 4, the heater portion 40 of the heating element 12 has heater wires 41 and 42 provided in a predetermined heater pattern. A conductive material (metal material) such as tungsten is used for the heater wires 41 and 42. The heater section 40 has a film-shaped base material 44. The base material 44 is made of, for example, a resin material having flexibility and insulation such as polyimide. The heater wires 41 and 42 are provided on the base material 44. The heater wires 41 and 42 are formed in a predetermined heater pattern on the base material 44 by, for example, a printing method.

The heater section 40 further has terminals 46 to 48. The terminals 46 to 48 are formed of a conductive material, like the heater wires 41 and 42. One end of the heater wire 41 is connected to the terminal 46. The other end of the heater wire 41 is connected to the terminal 48. One end of the heater wire 42 is connected to the terminal 47. The other end of the heater wire 42 is connected to the terminal 48. The terminals 46 to 48 are connected to the power supply terminal 12d of the heating element 12, and are connected to an external control device or the like via the power supply terminal 12d. As a result, it is possible to control the energization of the heater wires 41 and 42 via the power supply terminal 12d and the terminals 46 to 48. The terminals 46 to 48 may be used as the power supply terminal 12d.

The heater wire 41 generates heat by applying a voltage between the terminals 46 and 48 and supplying a current to the heater wire 41. Similarly, by applying a voltage between the terminals 47 and 48 and supplying a current to the heater wire 42, the heater wire 42 generates heat. The capacity of the heater wire 42 is different from the capacity of the heater wire 41. As a result, in the heater section 40 (heating element 12 ), the outer flow path 30 has three patterns in which only the heater wire 41 is heated, only the heater wire 42 is heated, and the heater wires 41, 42 are heated. It is possible to control the temperature of the water flowing through the inner channel 32.

The capacity of the heater wire 42 may be the same as the capacity of the heater wire 41. Further, in this example, the two heater wires 41 and 42 are provided in the heater portion 40, but the number of heater wires provided in the heater portion 40 is not limited to two, and may be one or three. Or more.

As shown in FIG. 4, the density of the heater wires 41, 42 on the upstream side of the outer flow path 30 is higher than the density of the heater wires 41, 42 on the downstream side of the outer flow path 30. Thereby, in the heating element 12, the average heating amount per unit amount of water flowing on the upstream side of the outer flow path 30 is made larger than the average heating amount per unit amount of water flowing on the downstream side of the outer flow path 30. be able to.

Further, in the heater section 40, the density of the heater wires 41 and 42 gradually decreases from the upstream side to the downstream side of the outer flow path 30. As a result, in the heating element 12, the average heating amount per unit amount of water flowing through the outer flow path 30 can be gradually reduced from the upstream side to the downstream side.

In this example, the density of the heater wires 41, 42 is changed by changing the interval between the heater wires 41, 42 having a substantially constant line width. For example, the density of the heater wires 41, 42 may be changed by changing the line width of the heater wires 41, 42.

Further, in this example, the average heating amount per unit amount of water flowing through the outer flow path 30 is changed from the upstream side to the downstream side by changing the interval between the heater wires 41 and 42 having a substantially constant line width. It is gradually changing toward. Without being limited to this, for example, by changing the line width of the heater wires 41, 42, the average heating amount per unit amount of water flowing through the outer flow path 30 is continuously changed from the upstream side to the downstream side. You may change it. The change of the average heating amount per unit amount of water flowing through the outer flow path 30 from the upstream side to the downstream side may be stepwise or continuous. Further, the change in the average heating amount per unit amount of water flowing through the outer flow path 30 may be changed in two steps, that is, an upstream portion and a downstream portion.

As described above, according to the heat exchanger 10 according to the present embodiment, since the average heating amount per unit amount of water is large on the upstream side in contact with cold water, the desired temperature can be obtained even if the heating element 12 is downsized. It can be easily heated to warm water. In addition, since the average amount of heating per unit amount of water is small on the downstream side that comes into contact with hot water, it is possible to prevent the surface temperature of the heating element 12 from becoming too high. Therefore, even if the heating element 12 is miniaturized, it can be heated to hot water having a desired temperature, and the surface temperature of the heating element 12 is locally increased, and it is possible to suppress the generation of boiling noise and scale.

Further, in the heat exchanger 10, the heating element 12 has heater wires 41 and 42 provided in a predetermined heater pattern, and the density of the heater wires 41 and 42 on the upstream side of the outer flow path 30 is equal to the outer flow path. It is higher than the density of the heater wires 41 and 42 on the downstream side of 30. In this way, by making the density of the heater wires 41, 42 on the upstream side of the outer flow path 30 higher than the density of the heater wires 41, 42 on the downstream side of the outer flow path 30, the upstream side of the outer flow path 30. The average heating amount per unit amount of the water flowing through can be made appropriately larger than the average heating amount per unit amount of the water flowing through the downstream side of the outer flow path 30.

Further, in the heat exchanger 10, the heating element 12 gradually reduces the average heating amount per unit amount of water flowing through the outer flow path 30 from the upstream side to the downstream side. As a result, it is possible to more appropriately suppress the occurrence of boiling noise and scale caused by locally increasing the surface temperature of the heating element 12.

FIG. 5A and FIG. 5B are enlarged cross-sectional views schematically showing modified examples of the instantaneous heat exchanger according to the first embodiment.
FIG. 5A corresponds to the region R1 shown in FIG. FIG. 5B corresponds to the region R2 shown in FIG. That is, FIG. 5A schematically shows the upstream side portion of the outer flow path 30, and FIG. 5B schematically shows the downstream side portion of the outer flow path 30.

As shown in FIGS. 5A and 5B, in this example, the cross-sectional area S1 on the upstream side of the outer flow passage 30 is larger than the cross-sectional area S2 on the downstream side of the outer flow passage 30.

In this example, the depth D1 on the upstream side of the outer flow path 30 is deeper than the depth D2 on the downstream side of the outer flow path 30. Further, the width W1 on the upstream side of the outer flow path 30 is wider than the width W2 on the downstream side of the outer flow path 30. As a result, the cross-sectional area S1 on the upstream side of the outer flow path 30 can be made larger than the cross-sectional area S2 on the downstream side of the outer flow path 30. However, the cross-sectional area of the outer flow passage 30 may be adjusted by at least one of the depth and the width of the outer flow passage 30.

As described above, on the upstream side of the outer flow path 30, by increasing the cross-sectional area S1, the flow velocity of the water flowing through the outer flow path 30 becomes slower, and the average heating amount per unit amount of water can be increased. it can. Then, on the downstream side of the outer flow path 30, by reducing the cross-sectional area S2, the flow velocity of the water flowing through the outer flow path 30 is increased, and the average heating amount per unit amount of water can be reduced.

Therefore, also in this example, even if the heating element 12 is downsized, it can be heated to hot water of a desired temperature, and the surface temperature of the heating element 12 is locally increased, thereby suppressing generation of boiling noise or scale. be able to. As described above, by making the cross-sectional area S1 on the upstream side of the outer flow path 30 larger than the cross-sectional area S2 on the downstream side of the outer flow path 30, per unit amount of water flowing in the upstream side of the outer flow path 30. The average heating amount can be appropriately made larger than the average heating amount per unit amount of water flowing on the downstream side of the outer flow path 30.

The average heating amount per unit amount of water flowing through the outer flow passage 30 may be adjusted by at least one of adjusting the density of the heater wires 41 and 42 of the heating element 12 and adjusting the cross-sectional area of the outer flow passage 30. For example, by adjusting the density of the heater wires 41, 42 of the heating element 12 and further adjusting the cross-sectional area of the outer flow passage 30, the average heating amount per unit amount of water flowing through the outer flow passage 30 can be further improved. It can be adjusted appropriately.

Further, in this example, the cross-sectional area of the outer flow passage 30 is gradually reduced from the upstream side to the downstream side. Thereby, also in this example, the average heating amount per unit amount of water flowing through the outer flow path 30 can be gradually reduced from the upstream side to the downstream side. As a result, similarly to the above-described embodiment, it is possible to more appropriately prevent the surface temperature of the heating element 12 from locally increasing and causing boiling noise and scale.

Further, in this example, for example, the cross-sectional area of the inner flow path 32 on the upstream side may be larger than the cross-sectional area of the inner flow path 32 on the downstream side. As a result, in addition to the outer flow path 30, the average heating amount per unit amount of water flowing on the upstream side of the inner flow path 32 is calculated as the average heating amount per unit amount of water flowing on the downstream side of the inner flow path 32. It can be larger than the quantity. Therefore, even if the heating element 12 is downsized, it can be heated more appropriately to hot water of a desired temperature, and the surface temperature of the heating element 12 is locally increased to cause boiling noise or scale. You can

(Second embodiment)
FIG. 6 is a perspective view schematically showing the toilet device according to the second embodiment.
FIG. 7 is a block diagram schematically showing the sanitary washing device according to the second embodiment.
Hereinafter, an example of the sanitary washing device including the heat exchanger according to the above-described embodiment will be described with reference to FIGS. 6 and 7.
As shown in FIG. 6, the sanitary washing device 200 according to this embodiment is provided in the toilet device 300 in a state of being installed on the western-style sitting toilet 301.

The sanitary washing device 200 includes a toilet seat 202 and a toilet lid 203 that are rotatably supported by the main body 201, and a nozzle 204. The nozzle 204 is provided so as to be able to move back and forth from the main body 201 into the bowl of the western-style seated toilet bowl 301 in response to a switch operation by a user of the toilet device 300. The sanitary washing device 200 injects washing water from the spout provided at the tip of the nozzle 204 in a state where the nozzle 204 extends into the bowl of the Western-style sitting toilet 301. The cleaning water sprayed from the nozzle 204 cleans a local part of the human body.

As shown in FIG. 7, the sanitary washing device 200 supplies water supplied from a water supply source 205 such as a water supply or a water storage tank to the heat exchanger 10 via a valve unit 206. Then, in the heat exchanger 10, the supplied water is turned into warm water and is supplied to the nozzle 204 as cleaning water. The valve unit 206 has a valve mechanism such as an electromagnetic opening/closing valve having a function as a water shutoff valve and a pressure regulating valve.

As described above, the sanitary washing device 200 according to the present embodiment includes the heat exchanger 10, the warm water generated by the heat exchanger 10 is used as the wash water, and the wash water is discharged from the nozzle 204, thereby Clean the area. As described above, according to the sanitary washing device 200 including the heat exchanger 10 according to the present embodiment, it is possible to stably perform washing with warm water whose temperature is controlled to be suitable for the user. Further, according to the sanitary washing device 200, even if the heating element 12 is downsized, it can be heated to warm water of a desired temperature, and the surface temperature of the heating element 12 locally rises, which causes boiling noise and scale. It is possible to provide the sanitary washing device 200 capable of suppressing the above.

The embodiments of the present invention have been described above. However, the present invention is not limited to these descriptions. A person skilled in the art appropriately modified the above-described embodiment is also included in the scope of the present invention as long as it has the features of the present invention. For example, the shape, size, material, arrangement, etc. of each element included in the heat exchanger 10, the sanitary washing device 200, and the like are not limited to those illustrated, but can be appropriately changed.
Further, each element included in each of the above-described embodiments can be combined as long as technically possible, and a combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

2 water-passing member, 10 instantaneous heat exchanger, 12 heating element, 12a hollow part, 12b outer peripheral surface, 12c inner peripheral surface, 12d power supply terminal, 14 case, 16 shaft core member, 16a protruding part, 18 coil spring, 20 case Main body, 20a hollow part, 20b protruding part, 20c water inlet, 22 lid part, 24 coil spring, 30 outer flow path, 32 inner flow path, 40 heater part, 41, 42 heater wire, 44 base material, 46 to 48 terminals, 200 sanitary washing device, 201 main body part, 202 toilet seat, 203 toilet lid, 204 nozzle, 205 water supply source, 206 valve unit, 300 toilet device, 301 western style toilet bowl

Claims (5)

An instantaneous heat exchanger that heats water to hot water,
A heating element for heating water,
A case that covers the outer periphery of the heating element and forms a flow path for flowing water to be heated by the heating element between the heating element;
Equipped with
At least one of the heating element and the flow path, the average heating amount per unit amount of water flowing upstream of the flow path, than the average heating amount per unit amount of water flowing downstream of the flow path. Instantaneous heat exchanger characterized by being large. The heating element has a heater wire provided in a predetermined heater pattern,
The instantaneous heat exchanger according to claim 1, wherein the density of the heater wire on the upstream side of the flow path is higher than the density of the heater wire on the downstream side of the flow path. The instantaneous heat exchanger according to claim 1 or 2, wherein a cross-sectional area on the upstream side of the flow passage is larger than a cross-sectional area on the downstream side of the flow passage. The at least one of the heating element and the flow path gradually reduces the average heating amount per unit amount of water flowing through the flow path from the upstream side to the downstream side. The instantaneous heat exchanger according to any one of 1. An instantaneous heat exchanger according to any one of claims 1 to 4,
A nozzle for discharging hot water generated by the instantaneous heat exchanger toward a user's local area,
A sanitary washing device comprising:

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