JP2020118349A - Instantaneous heat exchanger and sanitary washing device - Google Patents

Abstract

Kind Code: A1 An instantaneous heat exchange with a high heat exchange rate that suppresses the occurrence of gaps in the inner flow passage even when an inner flow passage is formed by arranging a shaft core member in the hollow portion of a cylindrical heat generating element. provide utensils and sanitary cleaning equipment. A instantaneous heat exchanger that heats water into hot water is provided between a cylindrical heating element having a hollow portion and an outer peripheral surface of the heating element that covers the outer periphery of the heating element. a case forming an outer flow path; and a shaft core member provided in the hollow portion of the heat generating element and forming an inner flow path between the inner peripheral surface of the heat generating element, wherein the shaft core member is , the instantaneous heat exchanger is positioned with respect to the heating element without being positioned by the case. [Selection drawing] Fig. 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, in the instantaneous heat exchanger of Patent Document 1, the shaft core member is integrally formed with the case via the lid. Since this lid is assembled to the case via the packing, the position with respect to the case may vary. In this way, if the position of the lid varies, the position of the shaft core member also varies, and the shaft core member may not be arranged in the center of the hollow portion of the cylindrical heating element.

When the shaft core member is displaced from the center of the hollow portion of the cylindrical heating element, that is, when the shaft core member is arranged eccentrically with respect to the hollow portion of the cylindrical heating element, the shaft core member and A gap may occur between the flexible member and the inner peripheral surface of the cylindrical heating element. When such a gap occurs, water flows so as to short-circuit the inner flow path, heat exchange efficiency decreases, and the risk of scale generation increases.

The present invention has been made based on the recognition of such a problem, and even when the inner flow path is formed by disposing the shaft core member in the hollow portion of the cylindrical heating element, a gap is generated in the inner flow path. It is an object of the present invention to provide an instantaneous heat exchanger having a high heat exchange rate and a sanitary washing device that suppresses the occurrence of heat.

A first aspect of the present invention is an instantaneous heat exchanger that heats water into hot water, which comprises a cylindrical heating element having a hollow portion and an outer circumferential surface of the heating element that covers the outer circumference of the heating element. An axial flow path formed between the case and an inner peripheral surface of the heating element, the shaft core member being provided in the hollow portion of the heating element; The member is an instantaneous heat exchanger characterized in that it is positioned with respect to the heating element without being positioned by the case.

According to this instantaneous heat exchanger, since the shaft core member is not positioned by the case, the shaft core member is eccentrically arranged with respect to the hollow portion of the cylindrical heating element due to assembly variation of the case. It can be suppressed. Therefore, even when the axial core member is arranged in the hollow portion of the cylindrical heating element to form the inner flow passage, the occurrence of a gap in the inner flow passage is suppressed, and the instantaneous heat exchange with a high heat exchange rate is achieved. Can be provided.

A second invention is the instantaneous heat exchanger according to the first invention, characterized in that the shaft core member is formed separately from the case and is not fixed to the case. ..

According to this instantaneous heat exchanger, since the shaft core member is formed separately from the case, it is possible to easily prevent the shaft core member from being positioned by the case.

In a third aspect based on the first or second aspect, the gap between the shaft core member and the inner peripheral surface of the heating element is filled with a coil spring, and the shaft core member is the heating element with the coil spring. It is an instantaneous heat exchanger characterized by being positioned with respect to.

According to this instantaneous heat exchanger, the axial core member can be held by utilizing the force of the coil spring, and the axial core member can be easily arranged in the center of the hollow portion of the cylindrical heating element. At the same time, the gap between the shaft core member and the peripheral surface of the heat generating body can be filled.

In a fourth aspect based on the third aspect, one end of the shaft core member is arranged apart from the case, and the coil spring engages with an engaging portion provided at the one end of the shaft core member. Thus, the instantaneous heat exchanger is characterized in that the movement of the shaft core member due to the water flowing through the inner flow path is suppressed.

According to this instantaneous heat exchanger, it is possible to prevent the axial core member from moving due to water pressure to form a gap in the inner flow path.

In a fifth aspect based on any one of the first to third aspects, the case abuts on one end of the shaft core member to prevent movement of the shaft core member by water flowing through the inner flow path. It is an instantaneous heat exchanger characterized by having a contact part to suppress.

According to this instantaneous heat exchanger, it is possible to prevent the axial core member from moving due to water pressure to form a gap in the inner flow path.

A sixth aspect of the present invention is the instantaneous heat generator according to the third or fourth aspect of the invention, wherein one end of the coil spring extends in the inner circumferential direction and the other end of the coil spring extends in the outer circumferential direction. It is an exchange.

According to this instantaneous heat exchanger, both the connection of the water-passing member for flowing water to the heating element and the holding of the coil spring when assembling the coil spring into the heating element can be achieved at the same time.

A seventh invention comprises the instantaneous heat exchanger according to any one of the first to sixth inventions, and a nozzle for discharging hot water generated by the 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 shaft core member is not positioned by the case, the shaft core member is eccentrically arranged with respect to the hollow portion of the cylindrical heating element due to variation in assembly of the case. Can be suppressed. Therefore, even when the inner core passage is formed by disposing the shaft core member in the hollow portion of the cylindrical heating element, it is possible to suppress the occurrence of a gap in the inner passage and to provide a sanitary washing device having a high heat exchange rate. Can be provided.

According to the aspect of the present invention, even when the inner core is formed by arranging the shaft core member in the hollow portion of the cylindrical heating element, the heat exchange rate which suppresses the generation of the gap in the inner flow path is improved. A high instantaneous heat exchanger and sanitary washing device are 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 perspective view which represents typically the coil spring which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view schematically showing a part of a heating element and a coil spring according to the first embodiment. FIG. 6A and FIG. 6B are a perspective view and a sectional view schematically showing a part of the shaft core member and the coil spring according to the first embodiment. It is sectional drawing which represents typically the modification of the instantaneous heat exchanger which concerns on 1st 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.
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.

As shown in FIG. 1, the heat exchanger 10 includes a heating element 12, a case 14, a shaft core member 16, and a coil spring 18.

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 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. 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. In this way, the gap between the shaft core member 16 and the inner peripheral surface 12c of the heating element 12 is filled with the coil spring 18, and the shaft core member 16 is positioned with respect to the heating element 12 by the coil spring 18.

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.

FIG. 4 is a perspective view schematically showing the coil spring according to the first embodiment.
As shown in FIG. 4, one end 18a of the coil spring 18 extends in the inner circumferential direction. On the other hand, the other end 18b of the coil spring 18 extends in the outer peripheral direction.

As described above, the coil spring 18 is inserted into 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. At this time, the coil spring 18 can be easily twisted by extending the one end 18a and the other end 18b and gripping the one end 18a and the other end 18b as described above. That is, the coil spring 18 can be easily inserted into the hollow portion 12a of the heating element 12.

FIG. 5 is a sectional view schematically showing a part of the heating element and the coil spring according to the first embodiment.
As shown in FIG. 5, the other end 18 b of the coil spring 18 extending in the outer peripheral direction engages with one end of the heating element 12 when inserted into the hollow portion 12 a of the heating element 12. As a result, the axial position of the coil spring 18 can be determined.

The axial lengths of the shaft core member 16 and the coil spring 18 are shorter than the axial length of the heating element 12 (see FIG. 1). The shaft core member 16 and the coil spring 18 are attached to the end of the heating element 12 on the side in contact with water (the end opposite to the power supply terminal 12d). At this time, the other end 18b of the coil spring 18 is engaged with one end of the heating element 12, and the axial position of the coil spring 18 is determined so that a space for inserting the water passage member 2 is provided on the opposite side of the heating element 12. It can be properly provided at the end.

FIG. 6A and FIG. 6B are a perspective view and a sectional view schematically showing a part of the shaft core member and the coil spring according to the first embodiment.
As shown in FIGS. 6A and 6B, the coil spring 18 engages with the engaging portion 16 b provided at one end of the shaft core member 16. The coil spring 18 engages with the engaging portion 16b of the shaft member 16 by, for example, one end 18a extending in the inner circumferential direction.

When the coil spring 18 is attached to the shaft core member 16, for example, the spiral protrusion 16 a is screwed into the coil spring 18 and the shaft core member 16 is rotated, so that the protrusion 16 a and the coil spring 18 are aligned along the pitch. The shaft core member 16 is inserted into the coil spring 18. At this time, the shaft core member 16 is inserted through the engaging portion 16b side from the other end 18b side of the coil spring 18. Then, while rotating the shaft core member 16, the inside of the coil spring 18 is advanced toward the one end 18a side, and the engaging portion 16b is engaged with the one end 18a. Thereby, even if one end of the shaft core member 16 is separated from the case 14, the position of the shaft core member 16 can be determined by the coil spring 18.

The engaging portion 16b has an inclined surface 16c. The engaging portion 16b engages with the one end 18a of the coil spring 18 to bring the inclined surface 16c into contact with the one end 18a of the coil spring 18, thereby moving the coil spring 18 from the one end 18a to the other end 18b along the inclination of the inclined surface 16c. Press in the direction you are heading.

As a result, the engaging portion 16b presses the coil spring 18 against the protruding portion 16a. In other words, the engaging portion 16b presses the coil spring 18 against the protruding portion 16a by sandwiching a part of the coil spring 18 between the inclined surface 16c of the engaging portion 16b and the protruding portion 16a. As a result, the coil spring 18 can be brought into close contact with the protruding portion 16a by the elastic force, and the gap between the shaft core member 16 and the inner peripheral surface 12c of the heating element 12 can be more appropriately closed by the coil spring 18.

Further, the coil spring 18 is brought into close contact with the projecting portion 16a by the elastic force, so that the axial movement of the shaft core member 16 can be suppressed. As described above, the coil spring 18 engages with the engaging portion 16b provided at one end of the shaft core member 16 to suppress the axial movement of the shaft core member 16 due to the water flowing through the inner flow path 32.

As described above, according to the heat exchanger 10 according to the present embodiment, the shaft core member 16 is prevented from being positioned by the case 14, so that the shaft core member 16 has a cylindrical heat generation due to variation in assembly of the case 14. It is possible to prevent the body 12 from being eccentrically arranged with respect to the hollow portion 12a. Therefore, even when the axial core member 16 is arranged in the hollow portion 12a of the cylindrical heating element 12 to form the inner flow passage 32, it is possible to suppress the generation of a gap in the inner flow passage 32 and to reduce the heat exchange rate. A high heat exchanger 10 can be provided.

Further, in the heat exchanger 10, since the shaft core member 16 is formed separately from the case 14, it is possible to easily prevent the shaft core member 16 from being positioned by the case 14.

Further, in the heat exchanger 10, the gap between the shaft core member 16 and the inner peripheral surface of the heating element 12 is filled with the coil spring 18, and the shaft core member 16 is positioned with respect to the heating element 12 by the coil spring 18. .. As a result, the force of the coil spring 18 can be used to hold the shaft core member 16, and the shaft core member 16 can be easily arranged in the center of the hollow portion 12a of the cylindrical heating element 12, and at the same time. It is possible to fill the gap between the shaft core member 16 and the inner peripheral surface of the heating element 12.

Further, in the heat exchanger 10, the coil spring 18 engages with the engaging portion 16b provided at one end of the shaft core member 16 to suppress the movement of the shaft core member 16 due to the water flowing through the inner flow path 32. .. As a result, even when one end of the shaft core member 16 is arranged away from the case 14, it is possible to prevent the shaft core member 16 from moving due to water pressure to form a gap in the inner flow path 32. it can.

Further, in the heat exchanger 10, one end 18a of the coil spring 18 extends in the inner circumferential direction, and the other end 18b of the coil spring 18 extends in the outer circumferential direction. This makes it possible to achieve both the connection of the water-passing member 2 for flowing water to the heating element 12 to the heating element 12 and the holding of the coil spring 18 when the coil spring 18 is assembled to the heating element 12.

FIG. 7: is sectional drawing which represents typically the modification of the instantaneous heat exchanger which concerns on 1st Embodiment. It should be noted that parts substantially the same in function and configuration as those of the above-described embodiment are designated by the same reference numerals and detailed description thereof will be omitted.
As shown in FIG. 7, in this heat exchanger 10a, the case 14 contacts one end of the shaft core member 16 to suppress the movement of the shaft core member 16 due to the water flowing through the inner flow path 32. It has a portion 22a. More specifically, the lid portion 22 of the case 14 has a contact portion 22a.

As a result, also in the heat exchanger 10a, it is possible to prevent the axial core member 16 from moving due to water pressure to form a gap in the inner flow path 32, as in the heat exchanger 10 of the above-described embodiment. ..

In each of the above embodiments, the shaft core member 16 is positioned with respect to the heating element 12 by the coil spring 18. The method of positioning the shaft core member 16 with respect to the heating element 12 is not limited to the above. For example, the shaft core member 16 may be held on the heating element 12 by a rubber member or the like that is separate from the shaft core member 16. Alternatively, an elastically deformable portion may be provided in a part of the shaft core member 16, and the elastically deformable portion may be used to hold the shaft core member 16 in the heating element 12. That is, the shaft core member 16 may be held on the heating element 12 by a flexible member that is separate from the case 14, such as a flexible member that is provided integrally with or separately from the shaft core member 16.

(Second embodiment)
FIG. 8 is a perspective view schematically showing the toilet device according to the second embodiment.
FIG. 9 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. 8 and 9.
As shown in FIG. 8, the sanitary washing device 200 according to the present 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. 9, the sanitary washing device 200 supplies water supplied from a water supply source 205 such as a water supply tank or a water storage tank to the heat exchanger 10 (or the heat exchanger 10a) via the 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 when the inner channel 32 is formed by disposing the shaft core member 16 in the hollow portion 12a of the cylindrical heating element 12, a gap is generated in the inner channel 32. It is possible to provide the sanitary washing device 200 having a high heat exchange rate.

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 exchangers 10 and 10a, the sanitary washing device 200, and the like are not limited to the exemplified ones 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, 10a 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, 16b engaging part, 16c inclined surface, 18 coil spring, 18a one end, 18b other end, 20 case body, 20a hollow part, 20b protruding part, 20c water inlet, 22 lid part, 22a contact part, 24 coil spring, 30 outer flow Passage, 32 inner flow passage, 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 (7)

An instantaneous heat exchanger that heats water to hot water,
A cylindrical heating element having a hollow portion,
A case that covers the outer periphery of the heating element and forms an outer flow path between the outer circumferential surface of the heating element;
A shaft core member that is provided in the hollow portion of the heating element and forms an inner flow path between the heating element and the inner peripheral surface of the heating element,
Equipped with
The instantaneous heat exchanger is characterized in that the shaft core member is positioned with respect to the heating element without being positioned by the case. The instantaneous heat exchanger according to claim 1, wherein the shaft core member is formed separately from the case and is not fixed to the case. A gap between the shaft core member and the inner peripheral surface of the heating element is filled with a coil spring,
The instantaneous heat exchanger according to claim 1 or 2, wherein the shaft core member is positioned with respect to the heating element by the coil spring. One end of the shaft core member is arranged apart from the case,
4. The coil spring suppresses movement of the shaft core member due to water flowing through the inner flow path by engaging with an engaging portion provided at the one end of the shaft core member. Instantaneous heat exchanger described. 4. The case according to claim 1, wherein the case has an abutting portion that abuts on one end of the shaft core member to suppress movement of the shaft core member due to water flowing through the inner flow path. The instantaneous heat exchanger described in 1 above. One end of the coil spring extends in the inner peripheral direction,
The instantaneous heat exchanger according to claim 3 or 4, wherein the other end of the coil spring extends in the outer peripheral direction. An instantaneous heat exchanger according to any one of claims 1 to 6,
A nozzle for discharging hot water generated by the instantaneous heat exchanger toward a user's local area,
A sanitary washing device comprising:

Images