JP5654292B2 - Cylindrical heat exchanger - Google Patents

Description

  The present invention relates to an instantaneous heating type cylindrical heat exchanger used in a sanitary washing apparatus that can wash a human body part with warm water after a stool.

  The sanitary washing device is provided with a heat exchanger for bringing the wash water to an appropriate temperature when washing the human body part after the toilet with water. There are various types of heat exchangers, and one of them is a cylindrical type as disclosed in Patent Document 1. In the case of the cylindrical heat exchanger disclosed in Patent Document 1, a small-diameter cylindrical ceramic heater is accommodated in a large-diameter cylindrical casing, and water flowing through the internal space of the heater is at the downstream end. In addition, the air flows along the outer periphery of the heater and is heated during this time. Further, paragraph 0066 of Patent Document 1 describes that a fin that restricts the flow direction of the water in a spiral direction can be provided on the inner surface of the casing.

JP 2001-132061 A (refer to FIG. 26 and FIG. 27 in particular)

  However, in the case of such a heat exchanger disclosed in Patent Document 1, the water flowing through the inside is relatively slow, so that the water temperature near the heat transfer surface of the heater is likely to rise, and the heat transfer of the heater If local overheating occurs in the plane, bubbles may be generated in the portion where the overheating has occurred, which is not preferable. In addition, because of such a low speed, it is difficult to mix water with high temperature and water with low temperature, and it is difficult to generate water with a stable temperature. In order to solve this problem and provide a uniform water temperature, a buffer tank (float storage chamber) is provided, in which high-temperature water and low-temperature water are agitated to generate water at a stable temperature (paragraph). However, when such a buffer tank is provided, the apparatus becomes large.

  Therefore, the present invention provides a cylindrical heat exchanger that can improve the heat transfer coefficient from the heat transfer surface of the heater to water and can quickly discharge the generated bubbles to the outside. Objective.

The cylindrical heat exchanger according to the present invention includes a casing having a bottomed cylindrical shape, a cylindrical shape, and each of an outer peripheral surface and an inner peripheral surface forms a heat transfer surface. A heater housed in the casing in a state in which the shaft core is substantially matched, and a pole-shaped core member disposed in the heater in a state in which the shaft core is substantially matched to the shaft core of the heater; The space between the outer peripheral surface of the core member and the inner peripheral surface of the heater forms an inner cylindrical flow path, and the space between the outer peripheral surface of the heater and the inner peripheral surface of the casing is An outer cylindrical flow path is formed, and a downstream end of the inner cylindrical flow path and an upstream end of the outer cylindrical flow path are formed between the inner bottom surface of the casing and the front end of the heater. The inner cylindrical flow path has an inner side that spirally circulates along the outer peripheral surface of the core member. It provided in a state where handed guide gapped so as not to contact the inner circumferential surface of the heater, wherein the outer tubular passage, outer helical guide orbiting in a spiral shape along the outer circumferential surface of the heater is the It is provided in a state where there is a gap so as not to contact the outer peripheral surface of the heater .

  By adopting such a configuration, the speed of the water flow can be increased, so that the heat transfer rate can be improved, and it is possible to quickly move along with the water flow by suppressing the retention of bubbles. it can. More specifically, the cylindrical heat exchanger according to the present invention has an inner spiral guide in the inner cylindrical flow path. Therefore, the water flowing through the inner cylindrical flow channel proceeds downstream while performing a spiral turning motion along the inner spiral guide, and then reverses the direction of travel in the folded space to form the outer cylindrical shape. Enter the flow path.

Here, when the swirling direction of water is the same in the inner cylindrical flow path and the outer cylindrical flow path, the loss of swirling energy of the water flow formed by the inner cylindrical flow path is suppressed. The water can be swirled also in the outer cylindrical flow path. Therefore, the speed of the water flow can be increased and the heat exchange efficiency can be improved. On the other hand, when the swirling direction of water is reversed between the inner cylindrical channel and the outer cylindrical channel, turbulence is promoted in the upstream portion of the outer cylindrical channel. Therefore, the improvement of the heat exchange efficiency accompanying this turbulent flow can be expected.
In addition, the inner cylindrical flow path is provided with an inner spiral guide that spirally circulates along the outer peripheral surface of the core member with a gap so as not to contact the inner peripheral surface of the heater. The outer spiral guide that circulates spirally along the outer peripheral surface of the heater is provided in the path with a gap so as not to contact the outer peripheral surface of the heater. Before the bubbles generated on the peripheral surface and the outer peripheral surface grow large, they can be easily discharged at the stage of small bubbles, and the bubbles can be sufficiently prevented from staying in the heat exchanger.

  The inner spiral guide is configured to spiral in one direction along the outer peripheral surface of the core member, and the outer spiral guide is configured to spiral in a direction opposite to the inner spiral guide. (Claim 2).

  That is, in the cylindrical heat exchanger according to the present invention, as described above, the inner spiral guide and the outer spiral guide are spirally opposite to each other. For this reason, the water flow whose traveling direction is reversed at the turn-back portion can proceed while spirally turning in the same direction without hindering the turning motion.

  Therefore, in the cylindrical heat exchanger according to the present invention, since the water flow advances while making a swiveling motion from the inner cylindrical flow path to the outer cylindrical flow path, the flow velocity becomes relatively large. As a result, the heat transfer coefficient can be improved as described above, and the bubbles can be prevented from staying and quickly moved along with the water flow, and discharged to the outside of the heat exchanger. Become.

  In addition, at least one of the inner spiral guide and the outer spiral guide may be configured using a coil-shaped member.

  By adopting such a configuration, various types of heat exchangers of various specifications can be realized by preparing various types of coil-shaped members and adopting and incorporating any appropriate one.

  Further, the inner spiral guide is constituted by a spiral rib integrally provided with respect to the outer peripheral surface of the core member, and / or the outer spiral guide is formed with respect to the inner peripheral surface of the casing. You may be comprised by the helical rib integrally provided around (Claim 4).

  By setting it as such a structure, a spiral guide can also be produced simultaneously at the time of manufacture of a core member or a casing, and it is excellent in the convenience at the time of manufacture. Moreover, it does not move or deform due to the impact received from the water stream, and has excellent resistance.

  In addition, one or both of the inner bottom surface of the casing and the tip of the core member that defines the folded space are guide portions that guide the liquid flowing in the inner cylindrical flow channel to the outer cylindrical flow channel. May be provided (Claim 5).

  By adopting such a configuration, when going from the inner cylindrical flow path to the outer cylindrical flow path through the folding space, it is possible to reduce the energy loss of the water flow in the folding space and to reduce the swirling energy loss. Can be reduced.

  By the way, the water flow in the inner cylindrical flow path and the water flow in the outer cylindrical flow path may be swirled in opposite directions. That is, in a state where the casing having a bottomed cylindrical shape and the cylindrical shape, each of the outer peripheral surface and the inner peripheral surface form a heat transfer surface, and the shaft core is substantially coincident with the shaft core of the casing. A heater housed in the casing; and a pole-shaped core member disposed in the heater in a state in which the shaft core is substantially aligned with the shaft core of the heater, and an outer periphery of the core member The space between the surface and the inner peripheral surface of the heater forms an inner cylindrical flow path, the space between the outer peripheral surface of the heater and the inner peripheral surface of the casing forms an outer cylindrical flow path, The downstream end of the inner cylindrical flow path and the upstream end of the outer cylindrical flow path communicate with each other via a folded space formed between the inner bottom surface of the casing and the tip of the heater, The inner cylindrical flow path is provided with an inner spiral guide that spirals in one direction along the outer peripheral surface of the core member. The outer cylindrical flow path may be provided with an outer spiral guide that spirals in the same direction as the inner spiral guide along the outer peripheral surface of the heater. Good.

  By adopting such a configuration, the speed of the water flow can be increased, so that the heat transfer rate can be improved, and it is possible to quickly move along with the water flow by suppressing the retention of bubbles. it can. More specifically, the cylindrical heat exchanger according to the present invention has an inner spiral guide in the inner cylindrical flow path. Therefore, the water flowing through the inner cylindrical flow channel proceeds downstream while performing a spiral turning motion along the inner spiral guide, and then reverses the direction of travel in the folded space to form the outer cylindrical shape. Enter the flow path. Here, as described above, the inner spiral guide and the outer spiral guide are spiral in the same direction. Therefore, the water flow in which the traveling direction is reversed at the turn-up portion is inhibited in its turning motion by the outer spiral guide, and can promote turbulent flow. As a result, the heat transfer coefficient can be improved as described above. In addition, the water flow in the cylindrical heat exchanger advances while swirling from the inner cylindrical flow path to the outer cylindrical flow path, and the flow rate can be made relatively large. It is possible to suppress and quickly move along with the water flow, and to discharge to the outside of the heat exchanger.

  According to the present invention, it is possible to provide a cylindrical heat exchanger that can improve the heat transfer rate from the heat transfer surface of the heater to water and can quickly discharge the generated bubbles to the outside. Can do.

It is an appearance perspective view showing a sanitary washing device provided with a heat exchanger concerning an embodiment of the invention. It is a perspective view which shows the external appearance structure of a cylindrical heat exchanger. It is a disassembled perspective view of the cylindrical heat exchanger shown in FIG. It is drawing which shows the structure of a heater (heater unit), (a) shows the external appearance shape seen from the direction orthogonal to the axial center of a cylindrical base part, (b) has shown the cross-sectional shape in the BB line. . It is sectional drawing in the VV line of the cylindrical heat exchanger shown in FIG. It is sectional drawing of the cylindrical heat exchanger which concerns on Embodiment 2 which comprises the other structure applicable to the cylindrical heat exchanger shown in FIG. It is sectional drawing which expands and shows the return space vicinity. It is drawing which shows the folding space vicinity which makes another structure, (a) is an expanded sectional view of the folding space vicinity, (b) is an external appearance perspective view of the one end part vicinity of a core member. 6 is an exploded perspective view of a cylindrical heat exchanger according to Embodiment 3. FIG. It is sectional drawing in the VV line shown in FIG. 2 about the cylindrical heat exchanger shown in FIG. It is sectional drawing of the cylindrical heat exchanger which concerns on Embodiment 4.

  Hereinafter, a heat exchanger according to an embodiment of the present invention will be described with reference to the drawings, taking an example applied to a sanitary washing device.

[Sanitary washing equipment]
FIG. 1 is an external perspective view showing a sanitary washing apparatus including a heat exchanger according to an embodiment of the present invention. As shown in FIG. 1, the sanitary washing device 1 is disposed on the upper surface of the toilet 2, and includes a main body 3, a toilet seat 4, a toilet lid 5, an operation unit 6, and the like. Of these, the main body 3 is disposed on the rear side (back side as viewed from the seated user) of the toilet seat 4, and in a horizontally long and hollow housing 3a, a cleaning unit, a drying unit (not shown), and In addition to the control unit that controls these operations, a cylindrical heat exchanger 7 (illustrated by a broken line) according to the present embodiment is accommodated. In this tubular heat exchanger 7, tap water (washing water) is introduced from a water supply facility attached to the building where the toilet 2 is installed, and is heated to an appropriate temperature inside. When the user operates the operation unit 6 to perform a predetermined input, the cleaning unit is driven, and cleaning water is jetted from the nozzles of the cleaning unit to the human body part in a shower shape. ing.

(Embodiment 1)
[Heat exchanger]
FIG. 2 is a perspective view showing an external configuration of the cylindrical heat exchanger 7, and FIG. 3 is an exploded perspective view of the cylindrical heat exchanger 7 (7A). As shown in FIG. 2, the cylindrical heat exchanger 7A has a cylindrical shape as a whole. As shown in FIG. 3, the casing 10, the heater (heater unit) 20, the core member 30, and the coil-shaped member. 40, 41.

  Of these, the casing 10 is formed in a bottomed cylindrical shape having an inner diameter D1. More specifically, the casing 10 includes a main body cylinder portion 11 having a cylindrical shape, one end in the axial direction thereof is closed to form a bottom portion 12, and an opening portion 13 is provided at the other end in the axial direction. ing. The opening 13 is provided with a flange portion 14 that extends in the diameter increasing direction and has a substantially rectangular shape when viewed along the axial direction. Further, a pipe member 15 is provided in the vicinity of the flange portion 14 in the main body cylinder portion 11, and the inner space thereof forms an outlet 7 b of the cylindrical heat exchanger 7 </ b> A to the inner space of the main body cylinder portion 11. Communicate.

  The heater (heater unit) 20 has a cylindrical shape having an outer diameter D2 (<D1) and an inner diameter D3 (<D2) (see also FIG. 4B described later). More specifically, the heater (heater unit) 20 includes a cylindrical base portion 21 having a cylindrical shape and an inner diameter dimension D3, and an opening 22 is formed in each of the one end portion 21a and the other end portion 21b in the axial direction. , 23. Further, a sheet heater 24 is wound around the outer peripheral surface of the cylindrical base portion 21, and an outer diameter including the sheet heater 24 is a dimension D2. A flange portion 25 having a substantially rectangular shape similar to the flange portion 14 of the casing 10 is externally fitted to a portion near the other end portion 21b of the cylindrical base portion 21 and around which the sheet heater 24 is wound. It is glued.

  FIG. 4 is a drawing showing the configuration of the heater (heater unit) 20, (a) shows the external shape seen from the direction perpendicular to the axis of the cylindrical base portion 21, and (b) is the BB line. The cross-sectional shape is shown. As shown in FIG. 4A, the sheet-like heater 24 is wound once so as to cover the outer peripheral surface from the axial direction one end portion 21a of the cylindrical base portion 21 to the vicinity of the other end portion 21b. The outer peripheral surface of the other end portion 21b of the base portion 21 is slightly exposed.

  Here, the cylindrical base portion 21 is made of ceramics such as alumina (aluminum oxide), and the sheet heater 24 is formed by printing a heater pattern 24b made of tungsten paste or the like on a homogeneous ceramic sheet 24a. Yes. Then, such a sheet-like heater 24 is wound so that the heater pattern 24b faces the outer peripheral surface of the cylindrical base portion 21, and is fired in this state. As a result, as shown in FIG. 4B, a sectional configuration in which the heater pattern 24b is sandwiched between the ceramic cylindrical base portion 21 and the ceramic sheet 24a is obtained.

  Returning to the state before firing again, the flange portion 25 is externally fitted to the sheet heater 24 in a state where the sheet heater 24 is wound around the cylindrical base portion 21. As shown in FIG. 3, the flange portion 25 has a substantially rectangular plate shape and has a through hole 25a at the center. The through hole 25a has an inner diameter slightly larger than the outer diameter D2 of the cylindrical base portion 21. have. Therefore, when the cylindrical base portion 21 is inserted into the through hole 25a, it can be fitted onto the sheet heater 24 wound around the cylindrical base portion 21. Then, in a state where the flange portion 25 is externally fitted to the cylindrical base portion 21 via the sheet-like heater 24, a glass sealing material is attached to the gap between the through hole 25a and the sheet-like heater 24, and firing is performed in this state. .

  As a result, the cross-sectional configuration shown in FIG. 4B is obtained as described above, and the flange portion 25 is liquid-tightly fitted and bonded to the cylindrical base portion 21 via the sheet heater 24. The heater (heater unit) 20 thus formed has an outer peripheral surface (the outer peripheral surface of the ceramic sheet 24a) forming a heat transfer surface (outer heat transfer surface) 26b and an inner peripheral surface (cylindrical base portion 21). The inner peripheral surface) also forms a heat transfer surface (inner heat transfer surface) 26a.

  On the other hand, as shown in FIG. 3, the core member 30 has a pole shape having an outer diameter D4 (<D3), and a concave portion 31 that is recessed toward the other end side in the axial direction in the axial direction one end 30a. Is formed. Further, an appropriate number (three in the present embodiment) of protruding spacers 32 are provided on the outer peripheral surface of the one end portion 30a and the outer peripheral surface of the other end portion 30b of the core member 30, respectively.

  The core member 30 and the heater (heater unit) 20 are externally fitted with coil-shaped members 40 and 41 formed of a predetermined wire material, respectively. That is, the coil-shaped member (inner spiral guide) 40 that fits around the core member 30 is unidirectional along the outer peripheral surface of the core member 30 as it moves away from the axial direction when viewed along the axial direction. It is configured to spiral around (clockwise in this embodiment). In addition, the coil-shaped member (outer spiral guide) 41 that is externally fitted to the heater (heater unit) 20 has an outer periphery of the heater (heater unit) 20 as it moves away from the axial direction when viewed along the axial direction. It is comprised so that it may wrap around spirally in the opposite direction (counterclockwise in this Embodiment) with the previous coil-shaped member 40 along a surface.

  The thickness dimension (wire diameter) of the wire forming the coiled member (inner spiral guide) 40 is the difference between the inner diameter dimension D3 of the heater (heater unit) 20 and the outer diameter dimension D4 of the core member 30 (that is, described later). Smaller than the width dimension of the inner cylindrical flow path 45 of FIG. Similarly, the thickness dimension (wire diameter) of the wire forming the coil-shaped member (outer spiral guide) 41 is the difference between the inner diameter dimension D1 of the casing 10 and the outer diameter dimension D2 of the heater (heater unit) 20 (that is, described later). The width dimension of the outer cylindrical flow path 47 is smaller. The spacer 32 of the core member 30 described above also serves as a locking portion that locks the coiled member (inner spiral guide) 40.

  FIG. 5 is a sectional view taken along line V-V of the cylindrical heat exchanger 7A shown in FIG. As shown in FIG. 5, a heater (heater unit) 20 having a coil-shaped member (outer spiral guide) 41 fitted on the casing 10 is inserted in a coaxial core shape. 14 and one end surface of the flange portion 25 of the heater (heater unit) 20 are in contact with each other. Further, a core member 30 with a coil-shaped member (inner spiral guide) 40 fitted thereto is inserted into the heater (heater unit) 20 in a coaxial core shape. Here, a convex portion 16 having a predetermined size is provided at the center of the inner surface of the bottom portion 12 of the casing 10, and this is fitted into a concave portion 31 formed in one end portion 30 a of the core member 30, so Positioning with respect to the casing 10 is performed. As a result, the axial direction position of the other end portion 30b of the core member 30 and the other end portion 21b of the cylindrical base portion 21 of the heater (heater unit) 20 substantially coincide with each other.

  In the cylindrical heat exchanger 7A thus assembled, a relatively small-diameter cylindrical space is formed between the outer peripheral surface of the core member 30 and the inner peripheral surface of the cylindrical base portion 21 of the heater (heater unit) 20. An inner cylindrical flow path 45 is formed. In the inner cylindrical flow path 45, the end of the core member 30 on the other end 30b side forms the inlet 7a of the cylindrical heat exchanger 7A. In addition, a relatively large-diameter cylinder is formed between the outer peripheral surface of the cylindrical base portion 21 of the heater (heater unit) 20 and closer to the one end portion 21a than the flange portion 25 and the inner peripheral surface of the casing 10. An outer cylindrical flow path 47 that forms a cylindrical space is formed. The coil-shaped member (inner spiral guide) 40 is disposed in the inner cylindrical flow path 45, and the coil-shaped member (outer spiral guide) 41 is disposed in the outer cylindrical flow path 47.

  The coil-shaped member (inner spiral guide) 40 is provided in a state where a gap is provided so as not to contact the heat transfer surface 26 a of the heater (heater unit) 20. Further, the coil-shaped member (outer spiral guide) 41 is also provided in a state where a gap is formed so as not to contact the heat transfer surface 26 b of the heater (heater unit) 20.

  Further, as shown in FIG. 5, the depth dimension of the internal space of the casing 10 is slightly larger than the length dimension on the one end 21 a side from the flange portion 25 of the cylindrical base portion 21 of the heater (heater unit) 20. Yes. Therefore, a gap is formed between the one end portion 21 a of the cylindrical base portion 21 and the inner surface of the bottom portion 12 of the casing 10, and this gap forms a folded space 46, and the upstream end of the inner cylindrical channel 45 described above. And the downstream end of the outer cylindrical flow path 47 communicate with each other.

  A part of the folding space 46 is defined by the inner surface of the bottom 12 of the casing 10 (hereinafter, the bottom inner surface 12a). As shown in FIG. 5, the bottom inner surface 12a is formed as a flat surface except for the convex portion 16, and intersects the inner surface of the main body cylinder portion 11 (hereinafter referred to as the main body inner surface 11a) at a substantially right angle. It is connected.

[Water flow]
Next, the function of such a cylindrical heat exchanger 7A will be described by paying particular attention to the flow of water inside. First, the cylindrical heat exchanger 7A is connected to a casing 10 and a fastening means such as a screw inserted into a hole 9 (see FIG. 2) formed through the flanges 14 and 25 of the heater (heater unit) 20. Thus, the sanitary washing device 1 is supported at an appropriate location on the main body 3 (see FIG. 1). Then, water such as tap water supplied from the outside is introduced from the inflow port 7a of the cylindrical heat exchanger 7A, heated inside by the heater (heater unit) 20, and then taken out from the outflow port 7b. The water thus adjusted to an appropriate temperature and taken out is guided to the cleaning unit and sprayed from the nozzle.

  Focusing on the flow of water in the cylindrical heat exchanger 7A, as shown in FIG. 5, the water that has entered the inner cylindrical flow path 45 from the inlet 7a is converted into a coiled member (inner spiral guide) 40. As a result of being guided by the guide member, it advances along the axial direction while performing a turning motion along the outer peripheral surface of the core member 30. In the present embodiment, due to the configuration of the coil-shaped member (inner spiral guide) 40 already described, the swirling direction of the water flow in the inner cylindrical channel 45 faces the inlet 7a from the outside along the axial direction. When viewed from the line of sight, it is clockwise (see the thick solid arrow in FIG. 5). During this time, the water is heated by heat transfer from the inner heat transfer surface 26a of the heater (heater unit) 20.

  When this water flow reaches the downstream end of the inner cylindrical flow path 45 and enters the folding space 46, it is reflected on the inner bottom surface of the bottom portion 12 of the casing 10. Therefore, the direction of travel of the water flow is reversed and the water flow is guided to the outer cylindrical flow path 47. The water flow that has entered the outer cylindrical flow path 47 is guided by the coil-shaped member (outer spiral guide) 41, and advances along the axial direction while performing a turning motion along the outer peripheral surface of the heat unit 20. Finally, it is discharged from the outlet 7b to the outside. In the present embodiment, due to the configuration of the coil-shaped member (outer spiral guide) 41 already described, the swirling direction of the water flow in the outer cylindrical channel 47 faces the inflow port 7a from the outside along the axial direction. When viewed from the line of sight, it is clockwise (see the thick broken line arrow in FIG. 5). During this time, the temperature of the water is further raised by heat transfer from the outer heat transfer surface 26b of the heater (heater unit) 20.

  Here, as described above, the coil-shaped member (inner spiral guide) 40 and the coil-shaped member (outer spiral guide) 41 are respectively connected to the heat transfer surface 26a and the heat transfer surface 26b of the heater (heater unit) 20. It is provided in a state where a gap is opened so as not to contact. The cross-sectional area of the flow channel through which water (or hot water) formed in the gap portion passes is smaller than the cross-sectional area of the flow channel other than the gap portion. For this reason, the flow rate of water (or hot water) passing through the flow path in the gap portion is larger than the flow rate of water (or hot water) passing through the flow path other than the gap portion.

  For this reason, if it is configured such that a relatively fast flow rate of water (or hot water) in the flow path of the gap portion can be used, before the bubbles generated on the heat transfer surface 26a and the heat transfer surface 26b grow large, It can be easily discharged from the outlet 7b in stages. That is, it becomes possible to sufficiently prevent bubbles from staying in the heat exchanger 7A.

  As described above, according to the cylindrical heat exchanger 7A according to the present embodiment, the water flow proceeds while making a swirl motion in both routes of the inner cylindrical channel 45 and the outer cylindrical channel 47. Therefore, the flow rate of water can be increased. Moreover, as described above, the inner cylindrical flow channel 45 and the outer cylindrical flow 47 have the same swirling direction of the water flow (both clockwise in this embodiment), so that the speed of the water flow can be increased. More can be achieved.

  And the improvement of the heat transfer rate from each heat-transfer surface 26a, 26b can be aimed at by speeding up of such a water flow.

  Thereby, in the inner cylindrical channel 45 and the outer cylindrical channel 47, the occurrence of local overheating is sufficiently prevented, and the generation of bubbles is sufficiently prevented. As a result, the durability of the heater (heater unit) 20 is improved.

  Further, even when bubbles are generated inside the cylindrical heat exchanger 7A, they can be transported together with a high-speed water flow and quickly discharged from the outlet 7b.

  Furthermore, in the cylindrical heat exchanger 7A, the temperature variation of the hot water (hot water) coming out from the outlet 7b is sufficiently reduced.

  Therefore, the hot water (hot water) coming out from the outflow port 7b such as a buffer tank disposed downstream of the cylindrical heat exchanger 7A employed in the conventional sanitary washing apparatus is temporarily stored and agitated. It is possible to omit the components that are provided to reduce the temperature variation of the hot water. As a result, the configuration of the main body 3 of the sanitary washing device 1 can be made compact and simple. As a result, it is possible to easily ensure a sufficient size of the seating surface of the toilet seat 4 of the sanitary washing device 1 even in a limited installation space.

  Further, a temperature detection sensor is provided outside the vicinity of the outlet 7b for the temperature of the hot water (hot water) coming out from the outlet 7b, and the heating amount (energization amount) feedback in heating the water by the heater (heater unit) 20 is fed back. Control may be performed. Also at this time, since the temperature variation of the hot water (hot water) coming out from the outlet 7b is sufficiently reduced, the temperature detection sensor can detect the accurate temperature and the feedback control accuracy can be sufficiently increased. .

  As described above, this cylindrical heat exchanger 7A is mounted on the sanitary washing device 1 (especially “instantaneous” sanitary washing device that creates hot water instantly when the user uses it without storing hot water at all times). It is suitable when it is done.

  The cylindrical heat exchanger 7A can be mounted even if it is a device other than the sanitary washing device as long as it is a device that requires a fluid heat exchange function capable of mounting the heat exchanger 7A. .

  Further, as already described, the wire diameters of the coil-shaped members 40 and 41 are smaller than the width dimensions (diameter width dimensions) of the inner cylindrical flow path 45 and the outer cylindrical flow path 47. Accordingly, among the water flows flowing through the inner cylindrical flow channel 45 and the outer cylindrical flow 47, the water flow restricted by the coiled members 40, 41 and the wire flow of the coiled members 40, 41 is overcome. There is also a water stream that travels in this way. Therefore, when these water streams are mixed, water is agitated, and further improvement in heat transfer coefficient can be expected.

  In the above description, the water flow in the inner cylindrical flow channel 45 and the outer cylindrical flow channel 47 is described as proceeding while turning clockwise as viewed in the direction facing the inflow port 7a. On the contrary, it may be configured to advance while turning counterclockwise. In this case, the coil-like member (inner spiral guide) 40 that is externally fitted to the core member 30, when viewed along the axial direction, along the outer peripheral surface of the core member 30 as it moves away from the axial direction. The coil-shaped member (outer spiral guide) 41 that is configured to spirally rotate counterclockwise and that is fitted on the heater (heater unit) 20 is disposed in the heater (heater unit) 20 as it moves away in the axial direction. What is necessary is just to comprise so that it may wrap around spirally in the clockwise direction opposite to the previous coil-shaped member (inner spiral guide) 40 along an outer peripheral surface.

(Embodiment 2)
FIG. 6 is a cross-sectional view of the cylindrical heat exchanger 7 (7B) showing another configuration applicable to the cylindrical heat exchanger 7 shown in FIG. As shown in FIG. 6, in this heat exchanger 7B, spiral ribs 50 and 51 are provided in place of the coil-like members 40 and 41 described above.

  More specifically, a spiral rib (inner spiral guide) 50 is formed integrally with the core member 30 on the outer peripheral surface of the core member 30. When the spiral rib (inner spiral guide) 50 is viewed along the axial direction of the core member 30, the spiral rib (inner spiral guide) 50 extends in one direction along the outer peripheral surface of the core member 30 (this embodiment). In the form, it is configured to wrap around in a spiral manner (clockwise in the form). On the other hand, a spiral rib (outer spiral guide) 51 is formed integrally with the casing 10 on the inner peripheral surface of the casing 10. When the spiral rib (outer spiral guide) 51 is viewed along the axial direction of the casing 10, the spiral rib (inner spiral guide) 51 extends along the inner peripheral surface of the casing 10 as it moves away from the axial direction. The spiral guide 50 is configured to circulate spirally in the opposite direction (counterclockwise in this embodiment). The other configuration is the same as the configuration of the cylindrical heat exchanger 7A according to the first embodiment described above, and thus the description thereof is omitted here.

  According to such a cylindrical heat exchanger 7B, the spiral ribs 50 and 51 can be simultaneously manufactured at the time of manufacturing the casing 10 and the core member 30, and the convenience at the time of manufacturing is excellent. Moreover, since it is integrated with respect to the casing 10 and the core member 30, movement and deformation do not occur due to the momentum of the water flow, and the resistance is excellent.

  Further, as described in the first embodiment, similarly to the coil-shaped member (inner spiral guide) 40, in this embodiment, the spiral rib (inner spiral guide) 50 is also transmitted to the heater (heater unit) 20. The gap is provided so as not to contact the hot surface 26a. Further, the spiral rib (outer spiral guide) 51 is also provided in a state where a gap is formed so as not to contact the heat transfer surface 26 b of the heater (heater unit) 20.

  The cross-sectional area of the flow channel through which water (or hot water) formed in the gap portion passes is smaller than the cross-sectional area of the flow channel other than the gap portion. For this reason, the flow rate of water (or hot water) passing through the flow path in the gap portion is larger than the flow rate of water (or hot water) passing through the flow path other than the gap portion.

  For this reason, if it is configured such that a relatively fast flow rate of water (or hot water) in the flow path of the gap portion can be used, before the bubbles generated on the heat transfer surface 26a and the heat transfer surface 26b grow large, It can be easily discharged from the outlet 7b in stages. That is, it becomes possible to sufficiently prevent bubbles from staying in the heat exchanger 7B.

  In addition, a coil-shaped member and a spiral rib may be used in combination. For example, a coil-shaped member (inner spiral guide) 40 is disposed in the inner cylindrical flow path 45, and a spiral is formed in the outer cylindrical flow path 47. A rib (outer spiral guide) 51 may be provided.

  Further, on the contrary, a spiral rib (inner spiral guide) 50 is provided in the inner cylindrical channel 45, and a coiled member (outer spiral guide) 41 is provided in the outer cylindrical channel 47. It may be.

  By the way, in the said Embodiment 1, 2, although the structure which made the bottom part inner surface 12a of the casing 10 which demarcates the return | turnback space 46 a flat surface was demonstrated, the structure of the bottom part inner surface 12a is not restricted to this. For example, a guide that guides the water flow flowing through the inner cylindrical flow path 45 to either or both of the inner bottom surface of the casing 10 that defines the folded space 46 and the one end 30 a of the core member 30 to the outer cylindrical flow path 47. A portion may be provided.

  FIG. 7 is an enlarged cross-sectional view showing the vicinity of the folding space 46 of the cylindrical heat exchanger 7. In the cylindrical heat exchanger 7 shown in FIG. 7, a rounded surface (guide portion) 60 having a rounded shape (R shape) is formed at a connection portion between the bottom inner surface 12a and the main body inner surface 11a. In addition, a flange portion 61 that circulates along the outer peripheral surface is formed at one end portion 30 a of the core member 30. The flange portion 61 is a tapered surface (guide portion) 62 so that the outer surface forms a predetermined angle with respect to the outer peripheral surface of the core member 30.

  Accordingly, the folded space 46 shown in FIG. 7 mainly includes an outer peripheral surface of the one end portion 30a of the core member 30, a tapered surface (guide portion) 62 of the flange portion 61, an inner surface 12a of the bottom portion, and a round surface (guide portion). ) 60. With such a configuration, the water flow flowing through the inner cylindrical flow path 45 is smoothly smoothed by the taper surface (guide portion) 62 and the rounded surface (guide portion) 60 when reaching the outer cylindrical flow path 47 through the folded space 46. Therefore, the loss of flow velocity can be reduced, and the loss of turning energy can also be reduced.

  Contrary to the above, a tapered surface may be formed at a connection portion between the bottom inner surface 12a and the main body inner surface 11a, and a rounded surface may be formed on the outer surface of the flange portion 61 of the one end portion 30a of the core member 30. Furthermore, both may be formed as a rounded surface, or both may be formed as a tapered surface.

  FIG. 8 is a drawing showing the vicinity of the folding space 46 that constitutes another configuration of the tubular heat exchanger 7, (a) is an enlarged sectional view of the vicinity of the folding space 46, and (b) is one end 30 a of the core member 30. FIG. As shown in FIG. 8A, in this tubular heat exchanger 7, as in the case of FIG. 7 described above, a rounded surface (guide portion) 60 is provided at the connection portion between the bottom inner surface 12a and the main body inner surface 11a. Is formed.

  On the other hand, the one end portion 30a of the core member 30 is provided with a guide portion 65 having a rib shape protruding from the outer peripheral surface of the one end portion 30a. The rising surface 65 a of the guide portion 65 (a surface substantially orthogonal to the outer peripheral surface of the core member 30) is substantially the same pitch as the coil-shaped member (inner spiral guide) 40 that is externally fitted to the core member 30, and surrounds the core member 30. It is formed to turn.

  With such a configuration, the water flow flowing through the inner cylindrical flow path 45 is guided by the rising surface 65a of the guide portion 65 and smoothly returned when reaching the outer cylindrical flow path 47 through the folding space 46. . Therefore, the loss of flow velocity can be reduced, and the loss of turning energy can also be reduced.

  Instead of providing the guide portion 65 at the one end portion 30a of the core member 30, a rib-shaped guide portion having the same configuration may be provided on the bottom inner surface 12a of the casing 10.

(Embodiment 3)
In the first and second embodiments described above, the configuration in which the swirl direction of the water flow in the inner cylindrical flow path 45 and the swirl direction of the water flow in the outer cylindrical flow path 47 are the same direction. However, the configuration for turning each water flow in the inner cylindrical channel 45 and the outer cylindrical channel 47 into a swirl flow is not limited to the above configuration. Therefore, hereinafter, a configuration in which the water flow in the inner cylindrical flow channel 45 and the water flow in the outer cylindrical flow channel 47 are swirled in opposite directions will be described.

  FIG. 9 is an exploded perspective view of the cylindrical heat exchanger 7 (7C) according to the third embodiment. The cylindrical heat exchanger 7C according to the third embodiment also has an overall cylindrical shape as with the cylindrical heat exchanger 7 shown in FIG. 2, and as shown in FIG. , A heater (heater unit) 20, a core member 30, and coiled members 40 and 141. The casing 10, the heater (heater unit) 20, the core member 30, and the coiled member (inner spiral guide) 40 included in the cylindrical heat exchanger 7 </ b> C have the same reference numerals as described in the first embodiment. It has the same configuration. Therefore, the detailed description about these structures is abbreviate | omitted. On the other hand, in the cylindrical heat exchanger 7C according to the present embodiment, a coiled member (outer spiral guide) 141 having a configuration different from the coiled member (outer spiral guide) 41 described in the first embodiment is provided. The outer cylindrical channel 47 is provided.

  More specifically, as shown in FIG. 9, the core member 30 and the heater (heater unit) 20 are externally fitted with coil-shaped members 40 and 141 formed of predetermined wires. That is, the coil-shaped member (inner spiral guide) 40 that fits around the core member 30 is unidirectional along the outer peripheral surface of the core member 30 as it moves away from the axial direction when viewed along the axial direction. It is configured to spiral around (clockwise in this embodiment). In addition, the coil-shaped member (outer spiral guide) 141 that is externally fitted to the heater (heater unit) 20 has an outer periphery of the heater (heater unit) 20 as it moves away from the axial direction when viewed along the axial direction. It is comprised so that it may wrap around spirally in the same direction (clockwise in this Embodiment) as the previous coil-shaped member (inner spiral guide) 40 along the surface.

  The thickness dimension (wire diameter) of the wire forming the coiled member (inner spiral guide) 40 is the difference between the inner diameter dimension D3 of the heater (heater unit) 20 and the outer diameter dimension D4 of the core member 30 (that is, described later). Smaller than the width dimension of the inner cylindrical flow path 45 of FIG. Similarly, the thickness dimension (wire diameter) of the wire forming the coiled member (outer spiral guide) 141 is the difference between the inner diameter dimension D1 of the casing 10 and the outer diameter dimension D2 of the heater (heater unit) 20 (that is, described later). The width dimension of the outer cylindrical flow path 47 is smaller. The spacer 32 of the core member 30 described above also serves as a locking portion that locks the coiled member (inner spiral guide) 40.

  FIG. 10 is a cross-sectional view taken along the line VV shown in FIG. 2 for the cylindrical heat exchanger 7C shown in FIG. As shown in FIG. 9, a heater (heater unit) 20 with a coil-shaped member (outer spiral guide) 141 fitted outside is inserted in a coaxial core shape with respect to the casing 10 described above. 14 and one end surface of the flange portion 25 of the heater (heater unit) 20 are in contact with each other. Further, a core member 30 with a coil-shaped member (inner spiral guide) 40 fitted thereto is inserted into the heater (heater unit) 20 in a coaxial core shape. Here, a convex portion 16 having a predetermined size is provided at the center of the inner surface of the bottom portion 12 of the casing 10, and this is fitted into a concave portion 31 formed in one end portion 30 a of the core member 30, so Positioning with respect to the casing 10 is performed. As a result, the axial direction position of the other end portion 30b of the core member 30 and the other end portion 21b of the cylindrical base portion 21 of the heater (heater unit) 20 substantially coincide with each other.

  In the cylindrical heat exchanger 7C thus assembled, a relatively small-diameter cylindrical space is formed between the outer peripheral surface of the core member 30 and the inner peripheral surface of the cylindrical base portion 21 of the heater (heater unit) 20. An inner cylindrical flow path 45 is formed. In the inner cylindrical flow path 45, the end of the core member 30 on the other end 30b side forms the inlet 7a of the cylindrical heat exchanger 7C. In addition, a relatively large-diameter cylinder is formed between the outer peripheral surface of the cylindrical base portion 21 of the heater (heater unit) 20 and closer to the one end portion 21a than the flange portion 25 and the inner peripheral surface of the casing 10. An outer cylindrical flow path 47 that forms a cylindrical space is formed. The coil-shaped member (inner spiral guide) 40 is disposed in the inner cylindrical flow path 45, and the coil-shaped member (outer spiral guide) 141 is disposed in the outer cylindrical flow path 47.

  The coil-shaped member (inner spiral guide) 40 is provided in a state where a gap is provided so as not to contact the heat transfer surface 26 a of the heater (heater unit) 20. Further, the coil-shaped member (outer spiral guide) 141 is also provided in a state where a gap is formed so as not to contact the heat transfer surface 26 b of the heater (heater unit) 20.

  Furthermore, as shown in FIG. 10, the depth dimension of the internal space of the casing 10 is slightly larger than the length dimension on the one end 21 a side from the flange portion 25 of the cylindrical base portion 21 of the heater (heater unit) 20. Yes. Therefore, a gap is formed between the one end portion 21 a of the cylindrical base portion 21 and the inner surface of the bottom portion 12 of the casing 10, and this gap forms a folded space 46, and the upstream end of the inner cylindrical channel 45 described above. And the downstream end of the outer cylindrical flow path 47 communicate with each other.

[Water flow]
Next, the function of such a cylindrical heat exchanger 7C will be described by paying particular attention to the flow of water inside. First, the cylindrical heat exchanger 7C is connected to a casing 10 and a fastening means such as a screw inserted into a hole 9 (see FIG. 2) formed through the flanges 14 and 25 of the heater (heater unit) 20. Thus, the sanitary washing device 1 is supported at an appropriate location on the main body 3 (see FIG. 1). Then, water such as tap water supplied from the outside is introduced from the inlet 7a of the cylindrical heat exchanger 7C, heated by a heater (heater unit) 20 inside, and then taken out from the outlet 7b. The water thus adjusted to an appropriate temperature and taken out is guided to the cleaning unit and sprayed from the nozzle.

  Here, focusing on the flow of water in the cylindrical heat exchanger 7C, as shown in FIG. 10, the water that has entered the inner cylindrical flow path 45 from the inlet 7a is converted into a coil-shaped member (inner spiral guide) 40. As a result of being guided by the guide member, it advances along the axial direction while performing a turning motion along the outer peripheral surface of the core member 30. In the present embodiment, due to the configuration of the coil-shaped member (inner spiral guide) 40 already described, the swirling direction of the water flow in the inner cylindrical channel 45 faces the inlet 7a from the outside along the axial direction. When viewed from the line of sight, it is clockwise (see thick solid arrow in FIG. 10). During this time, the water is heated by heat transfer from the inner heat transfer surface 26a of the heater (heater unit) 20.

  When this water flow reaches the downstream end of the inner cylindrical flow path 45 and enters the folding space 46, it is reflected on the inner bottom surface of the bottom portion 12 of the casing 10. Therefore, the direction of travel of the water flow is reversed and the water flow is guided to the outer cylindrical flow path 47. The water flow that has entered the outer cylindrical flow path 47 is guided by the coil-shaped member (outer spiral guide) 141, and proceeds along the axial direction while performing a turning motion along the outer peripheral surface of the heat unit 20. Finally, it is discharged from the outlet 7b to the outside. In the present embodiment, due to the configuration of the coil-shaped member (outer spiral guide) 141 already described, the swirling direction of the water flow in the outer cylindrical channel 47 faces the inflow port 7a from the outside along the axial direction. When viewed from the line of sight, it is counterclockwise (see thick broken line arrow in FIG. 10). During this time, the temperature of the water is further raised by heat transfer from the outer heat transfer surface 26b of the heater (heater unit) 20.

  Here, as described above, the coil-shaped member (inner spiral guide) 40 and the coil-shaped member (outer spiral guide) 141 are respectively connected to the heat transfer surface 26a and the heat transfer surface 26b of the heater (heater unit) 20. It is provided in a state where a gap is opened so as not to contact. The cross-sectional area of the flow channel through which water (or hot water) formed in the gap portion passes is smaller than the cross-sectional area of the flow channel other than the gap portion. For this reason, the flow rate of water (or hot water) passing through the flow path in the gap portion is larger than the flow rate of water (or hot water) passing through the flow path other than the gap portion.

  For this reason, if it is configured such that a relatively fast flow rate of water (or hot water) in the flow path of the gap portion can be used, before the bubbles generated on the heat transfer surface 26a and the heat transfer surface 26b grow large, It can be easily discharged from the outlet 7b in stages. That is, it becomes possible to sufficiently prevent bubbles from staying in the heat exchanger 7.

  As described above, according to the cylindrical heat exchanger 7C according to the present embodiment, the water flow advances while making the swirl motion in both routes of the inner cylindrical channel 45 and the outer cylindrical channel 47. Therefore, the flow rate of water can be increased, and bubbles generated inside can be quickly discharged from the outlet 7b to the outside. In addition, as described above, the swirling direction of the water flow is reversed between the inner cylindrical flow path 45 and the outer cylindrical flow 47, so that the water flow whose traveling direction is reversed in the folded space 46 is outside. It enters the cylindrical channel 47 and quickly collides with the coiled member (outer spiral guide) 141 and is agitated to promote turbulent flow.

  As a result, the heat transfer rate is improved, and the water temperature is made uniform (sufficient reduction in variations in water temperature). Therefore, in the inner cylindrical channel 45 and the outer cylindrical channel 47, the occurrence of local overheating is sufficiently prevented, and the generation of bubbles is sufficiently prevented. Further, along with this, the durability of the heater (heater unit) 20 is improved. Further, in the cylindrical heat exchanger 7, the temperature variation of the hot water (hot water) coming out from the outlet 7b is sufficiently reduced.

  Therefore, hot water (hot water) coming out from the outlet 7b such as a buffer tank disposed downstream of the cylindrical heat exchanger 7C employed in the conventional sanitary washing apparatus is temporarily stored and stirred. It is possible to omit the components that are provided to reduce the temperature variation of the hot water. As a result, the configuration of the main body 3 of the sanitary washing device 1 can be made compact and simple. As a result, it is possible to easily ensure a sufficient size of the seating surface of the toilet seat 4 of the sanitary washing device 1 even in a limited installation space.

  Further, a temperature detection sensor is provided outside the vicinity of the outlet 7b for the temperature of the hot water (hot water) coming out from the outlet 7b, and the heating amount (energization amount) feedback in heating the water by the heater (heater unit) 20 is fed back. Control may be performed. Also at this time, since the temperature variation of the hot water (hot water) coming out from the outlet 7b is sufficiently reduced, the temperature detection sensor can detect the accurate temperature and the feedback control accuracy can be sufficiently increased. .

  As described above, this cylindrical heat exchanger 7C is mounted on the sanitary washing apparatus 1 (particularly, the “instantaneous” sanitary washing apparatus that instantly creates hot water when the user uses it without storing hot water at all times). It is suitable when it is done.

  The cylindrical heat exchanger 7C can be mounted even if it is a device other than the sanitary washing device as long as it is a device that requires a fluid heat exchange function capable of mounting the heat exchanger 7. .

  Further, as already described, the wire diameters of the coil-shaped members 40 and 141 are smaller than the width dimensions (diameter width dimensions) of the inner cylindrical flow path 45 and the outer cylindrical flow path 47. Therefore, among the water flows flowing through the inner cylindrical flow channel 45 and the outer cylindrical flow 47, the water flow that is restricted by the coiled members 40 and 141 to become a swirl flow, and overcomes the wire rods of the coiled members 40 and 141. There is also a water stream that travels in this way. Therefore, when these water streams are mixed, water is agitated, and further improvement in heat transfer coefficient can be expected.

  Note that the direction of the water flow in the inner cylindrical flow channel 45 and the direction of the water flow in the outer cylindrical flow channel 47 may both be opposite to those described above. In this case, the coil-like member (inner spiral guide) 40 that is externally fitted to the core member 30, when viewed along the axial direction, along the outer peripheral surface of the core member 30 as it moves away from the axial direction. The coil-shaped member (outer spiral guide) 141 that is configured to spirally rotate counterclockwise and that is fitted around the heater (heater unit) 20 is disposed in the heater (heater unit) 20 as it moves away in the axial direction. What is necessary is just to comprise so that it may wrap around spirally in the same counterclockwise direction as the previous coil-shaped member (inner spiral guide) 40 along an outer peripheral surface.

(Embodiment 4)
FIG. 11 is a cross-sectional view of a cylindrical heat exchanger 7 (7D) according to Embodiment 4 showing another configuration applicable to the cylindrical heat exchanger 7 shown in FIG. As shown in FIG. 11, in this heat exchanger 7 </ b> D, spiral ribs 50 and 151 are provided instead of the above-described coiled members 40 and 141.

  More specifically, a spiral rib (inner spiral guide) 50 is formed integrally with the core member 30 on the outer peripheral surface of the core member 30. When the spiral rib (inner spiral guide) 50 is viewed along the axial direction of the core member 30, the spiral rib (inner spiral guide) 50 extends in one direction along the outer peripheral surface of the core member 30 (this embodiment). In the form, it is configured to wrap around in a spiral manner (clockwise in the form). On the other hand, a spiral rib (outer spiral guide) 151 is formed integrally with the casing 10 on the inner peripheral surface of the casing 10. When the spiral rib (outer spiral guide) 151 is viewed along the axial direction of the casing 10, the spiral rib (inner spiral guide) 151 extends along the inner peripheral surface of the casing 10 as it moves away from the axial direction. The spiral guide 50 is configured to spiral in the same direction (clockwise in the present embodiment). The other configuration is the same as the configuration of the cylindrical heat exchanger 7C according to Embodiment 3 that has already been described, and thus the description thereof is omitted here.

  According to such a cylindrical heat exchanger 7D, the spiral ribs 50 and 151 can be simultaneously manufactured at the time of manufacturing the casing 10 and the core member 30, and the convenience at the time of manufacturing is excellent. Moreover, since it is integrated with respect to the casing 10 and the core member 30, movement and deformation do not occur due to the momentum of the water flow, and the resistance is excellent.

  Further, as described in the previous third embodiment, similarly to the coil-shaped member (inner spiral guide) 40, in this embodiment, the spiral rib (inner spiral guide) 50 is also transmitted to the heater (heater unit) 20. The gap is provided so as not to contact the hot surface 26a. Further, the spiral rib (outer spiral guide) 151 is also provided in a state where a gap is formed so as not to contact the heat transfer surface 26 b of the heater (heater unit) 20.

  The cross-sectional area of the flow channel through which water (or hot water) formed in the gap portion passes is smaller than the cross-sectional area of the flow channel other than the gap portion. For this reason, the flow rate of water (or hot water) passing through the flow path in the gap portion is larger than the flow rate of water (or hot water) passing through the flow path other than the gap portion.

  For this reason, if it is configured such that a relatively fast flow rate of water (or hot water) in the flow path of the gap portion can be used, before the bubbles generated on the heat transfer surface 26a and the heat transfer surface 26b grow large, It can be easily discharged from the outlet 7b in stages. That is, it becomes possible to sufficiently prevent bubbles from staying in the heat exchanger 7.

  In addition, a coil-shaped member and a spiral rib may be used in combination. For example, a coil-shaped member (inner spiral guide) 40 is disposed in the inner cylindrical flow path 45, and a spiral is formed in the outer cylindrical flow path 47. A rib (outer spiral guide) 151 may be provided, or conversely, a spiral rib (inner spiral guide) 50 is provided in the inner cylindrical channel 45 and a coil is provided in the outer cylindrical channel 47. A shaped member (outer spiral guide) 141 may be provided.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the above-mentioned Embodiment 1-4.

  For example, the heater mounted on the heat exchanger 7 is not limited to a ceramic heater, and a so-called print heater may be employed.

  In the first to fourth embodiments, the end on the other end 30 b side of the core member 30 in the inner cylindrical channel 45 is used as the inlet 7 a of the cylindrical heat exchanger 7, and protrudes from the main body cylindrical portion 11. Although the structure which made the opening of the pipe member 15 the outflow port 7b was shown, it is not restricted to this. That is, on the contrary, in the inner cylindrical flow path 45, the end on the other end 30b side of the core member 30 is used as an outlet of the cylindrical heat exchanger 7, and the tube member 15 protruding from the main body cylinder 11 is provided. The opening may be used as the inlet. In this case, when the cylindrical heat exchanger 7 is viewed in a cross section perpendicular to the longitudinal direction, the internal flow path of the tube member 15 that forms the inlet port circumscribes the cylindrical base portion 21 of the heater (heater unit) 20. Thus, it is preferable to arrange the pipe member 15. As a result, the water flowing in from the tube member 15 can smoothly enter the outer cylindrical channel 47, and a swirl flow can be quickly formed in the outer cylindrical channel 47.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a cylindrical heat exchanger that can improve the heat transfer rate from the heat transfer surface of the heater to water and can quickly discharge the generated bubbles to the outside. .

7, 7A-7D Cylindrical heat exchanger 10 Casing 20 Heater (heater unit)
24 sheet heater 26a inner heat transfer surface 26b outer heat transfer surface 30 core member 40 coiled member (inner spiral guide)
41,141 Coiled member (outer spiral guide)
45 Inner cylindrical flow path 46 Folding space 47 Outer cylindrical flow path 50 Spiral rib (inner spiral guide)
51,151 Spiral rib (outer spiral guide)
60 Earl surface (guide part)
61 Head part 62 Tapered surface (guide part)
65 Guide section

Claims (5)

A casing having a bottomed cylindrical shape;
A heater that is cylindrical and has an outer peripheral surface and an inner peripheral surface that form a heat transfer surface, and that is housed in the casing in a state in which the shaft core is substantially aligned with the shaft core of the casing;
A pole-shaped core member disposed in the heater in a state in which the axis is substantially aligned with the axis of the heater, and
The space between the outer peripheral surface of the core member and the inner peripheral surface of the heater forms an inner cylindrical flow path,
The space between the outer peripheral surface of the heater and the inner peripheral surface of the casing forms an outer cylindrical flow path,
The downstream end of the inner cylindrical flow channel and the upstream end of the outer cylindrical flow channel communicate with each other via a folded space formed between the inner bottom surface of the casing and the tip of the heater,
In the inner cylindrical flow path, an inner spiral guide that spirally circulates along the outer peripheral surface of the core member is provided in a state where there is a gap so as not to contact the inner peripheral surface of the heater ,
The outer cylindrical flow path is provided with an outer spiral guide that spirally circulates along the outer peripheral surface of the heater in a state where a gap is provided so as not to contact the outer peripheral surface of the heater. Exchanger.   The inner spiral guide spirals in one direction along the outer peripheral surface of the core member, and the outer spiral guide spirals in a direction opposite to the inner spiral guide. Cylindrical heat exchanger.   The cylindrical heat exchanger according to claim 1 or 2, wherein at least one of the inner spiral guide and the outer spiral guide is configured using a coil-shaped member.   The inner spiral guide is constituted by a spiral rib provided integrally with the outer peripheral surface of the core member, and / or the outer spiral guide is integrated with the inner peripheral surface of the casing. The cylindrical heat exchanger according to claim 1, wherein the cylindrical heat exchanger is configured by spiral ribs provided around the pipe.   Either or both of the inner bottom surface of the casing and the tip of the core member that define the folded space are provided with guide portions that guide the liquid flowing through the inner cylindrical flow channel to the outer cylindrical flow channel. The cylindrical heat exchanger according to any one of claims 1 to 3.

Images