JP4423956B2 - Heat exchanger and sanitary washing apparatus provided with the same - Google Patents

Description

  The present invention relates to a heat exchanger provided with a heater that heats cold water to hot water, and a sanitary washing device that uses the heat exchanger to wash a local part of a human body.

  Conventionally, this type of heat exchanger has a double tube structure including a cylindrical base pipe 101 and an outer cylinder 102 as shown in FIG. A heater unit 103 is provided on a part of the outer surface of the base pipe 101. A spiral core 105 is inserted into the inner hole 104 of the base pipe 101 (see, for example, Patent Document 1).

In the above configuration, water as a fluid flows through the inner hole 104 of the base pipe 101, and at that time, the water is inserted into the inner hole 104 of the base pipe 101 to the screw thread 106 of the spiral core 105. The hot water is discharged by exchanging heat with the heat from the heater unit 103.
JP 2001-279786 A

  However, in the conventional configuration, since the heater portion 103 is provided outside the base material pipe 101, an outer cylinder 102 for thermally insulating and enclosing the heater portion 103 is necessary, which is a large configuration. Further, since the heater unit 103 is provided on the outer surface of the base material pipe 101, the heat of the heater unit 103 escapes to the outside of the base material pipe 101, which causes a problem that heat exchange efficiency is poor. Furthermore, in order to insert and hold the spiral core 105 in the inner hole 104, it is necessary to contact the inner surface of the base material pipe 101 with the heater portion 103, and the spiral core 105 is made of a thermally strong material. There was a restriction that it had to be.

  An object of the present invention is to reduce scale adhesion or scale clogging in a flow path portion of a heat exchanger by providing a flow rate conversion means in a small heat exchanger having high heat exchange efficiency.

  In order to solve the above-described conventional problems, the heat exchanger of the present invention changes the flow velocity to the flow path provided on the outer periphery of the heating element, the case constituting the flow path, and at least a part of the flow path. A flow rate conversion means is provided.

  Thus, by providing the flow path on the outer periphery of the heating element, the heat insulation is performed by the flow path, so that it is not necessary to provide a thermal insulating layer, and the size can be reduced. Then, by enclosing the outer periphery of the heating element with a flow path, it is possible to make a configuration that hardly releases heat to the outside of the case, and the heat exchange efficiency can be improved with a small size.

  Moreover, since the flow rate conversion means provided in the flow path can be held by the inner wall of the case at a low temperature, it can be used even with a material having low heat resistance such as resin, so that it is excellent in workability and can be lightweight. At the same time, the flow velocity conversion means accelerates the flow velocity of the flow path, thereby reducing adhesion of scales and the like generated on the surface of the heating element and the flow path.

  In the heat exchanger of the present invention, the flow rate conversion means is installed in the flow path provided on the outer periphery of the heating element, so that the flow speed of the flow path is accelerated and it is difficult to attach the scale generated on the surface of the heating element or in the flow path. However, even if the scale is about to adhere, it can be peeled off by the flow velocity, so that the adhesion can be reduced, and it is possible to realize a small size, high efficiency and a long life.

The first invention comprises a flow path provided on the outer periphery of the heating element, a case surrounding the flow path, and a flow rate conversion means for changing the flow speed at least at a part of the flow path. By arranging a plurality of water inlets from upstream to downstream to increase the flow rate, the flow rate of the flow path can peel off deposits such as scales generated on the surface of the heating element, reducing adhesion. It can be small, achieve high efficiency and have a long life.

Further , the downstream flow rate at which scale adhesion is likely to occur is increased, the scale adhesion can be reduced, and the flow path pressure loss can be reduced because the flow path is not narrowed.

2nd invention is equipped with the flow path provided in the outer periphery of a heat generating body, the case surrounding a flow path, and the flow-rate conversion means which changes a flow rate at least to a part of flow path, By adopting a configuration in which another fluid is introduced to increase the flow velocity, the value effect by the other fluid can be added, and at the same time, the adhesion of the scale can be reduced in two birds with one stone.

The third aspect of the invention is particularly narrow in the sanitary washing apparatus provided with the heat exchanger of the first or second aspect of the invention, by downsizing the heat exchanger, so that the size of the sanitary washing apparatus body can be reduced. It can be easily installed in the toilet space, and by preventing the scale from adhering to the heat exchanger at an early stage, it is possible to prevent clogging of scale debris in the cleaning nozzle of the sanitary cleaning device, and a long-life sanitary cleaning It can be a device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 is a sectional view of a heat exchanger according to the first embodiment of the present invention.

  In FIG. 1, the heat exchanger includes a sheathed heater 7 as a heating element for heating water as a fluid, a case 8 that surrounds the outer periphery of the sheathed heater 7 to form a flow path 9, and a spiral flow path 9. It is comprised with the spring 10 as a flow velocity conversion means for comprising. And the water inlet 11, the water outlet 12, the electrode terminals 13 and 14 of the sheathed heater 7, and the O-ring 15 for sealing the flow path 9 are provided. In addition, 16 arrows in the figure indicate the flow of water.

  About the heat exchanger comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, as shown in FIG. 2, the sheathed heater 7 as a heating element has a heating wire 18 disposed in a coil shape in a copper pipe 17 in which magnesium oxide (not shown) is sealed. . Then, electricity is applied to the electrode terminals 13 and 14 connected to the heating wire 18 to heat the heating wire 18, and heat is transferred to the copper pipe 17, so that water flowing around the copper pipe 17 is heated. It becomes hot water and heat is exchanged.

  Here, as shown in the side sectional view of FIG. 3, water enters from the water inlet 11 provided at the side surface position eccentric from the center of the case 8, flows into the outer periphery of the copper pipe 17 of the sheathed heater 7, The spring 10 spirally disposed along the outer periphery of the copper pipe 17 flows spirally around the outer periphery of the copper pipe 17 and is discharged again from the discharge port 12 provided on the side surface. Here, in the spring 10 arranged in a spiral shape, the cross-sectional area of the flow path constituting the pitch 6 of the spring 10 is larger than the cross-sectional area of the substantially donut-shaped flow path formed between the case 8 and the copper pipe 17. It was made to turn with the pitch which becomes narrow. As a result, the flow velocity of the swirling flow that spirally flows along the spring 10 becomes faster than that without the spring 10, and the flow velocity is accelerated.

In addition, the cylindrical flow passage space surrounded by the case 8 and the copper pipe 17 has a flow passage cross section with a large aspect ratio. If the spring 10 is not provided, the inlet passage provided at the side surface eccentric from the center of the case 8 is provided. The water that has entered from the water port 11 initially flows spirally along the outer periphery of the copper pipe 17, but the swirling flow is lost as it goes downstream, and the cylindrical axial flow component becomes the main component gradually. Substantially reduces the flow rate of water. However, in this embodiment, the spring 10 as the flow rate conversion means for forming the flow path 9 in a spiral shape is provided on the outer periphery of the sheathed heater 7 that is a heating element. As a result, the region of the boundary layer between the copper pipe 17 of the sheathed heater 7 and the fluid water is very thin. A flow velocity distribution diagram showing the situation is shown in FIG.
And schematically shown in FIG. As described above, the slow flow rate portion 19 shown in FIG. 4 is reduced as in the boundary layer 20 of the flow rate distribution shown in FIG. 5, and accumulation of scales and the like attached to the copper pipe 17 of the sheathed heater 7 is prevented. be able to.

  Further, the deposited scale portion has an effect of being flowed to the downstream side by a fast flow, and the scale is crushed small by the swirling flow at a flow velocity and flows to the downstream side, so that it is not clogged on the downstream side. And since a scale becomes difficult to adhere in a heat exchanger, the lifetime as a heat exchanger can be extended. In addition, the spiral smooth flow can realize a small flow path pressure loss while achieving a high flow rate, and the high flow rate can improve the heat exchange efficiency and realize downsizing. be able to.

  Thus, the flow path 9 is configured by the case 8 provided on the outer periphery of the heating element 7, and the flow rate conversion means 10 for accelerating the flow speed is provided in a part of the flow path 9, thereby The flow velocity is accelerated, and adhesion of scales and the like generated on the surface of the heating element 7 can be reduced. Further, by forming the flow path 9 that swirls at the flow velocity on the outer periphery of the heating element 7, a small size and high efficiency can be realized, and a scale can be prevented from adhering to a long life. And since the heat insulation is performed by a flow path by providing the flow path 9 in the outer periphery of the heat generating body 7, it is not necessary to provide a thermal insulating layer, and can be reduced in size. Moreover, it can be set as the structure which does not escape heat outside by enclosing the heat generating body 7 by a flow path, and can improve heat exchange efficiency. Furthermore, since the flow rate conversion means 10 provided in the flow path can be held by the inner wall of the case 8 which is a low temperature portion, a material having a low heat resistant temperature such as a resin can be used. Therefore, the flow rate conversion means 10 can be manufactured from a material that is easy to process and can be made light weight. Also, the flow rate conversion means 10 accelerates the flow rate in the flow path, so that it is generated on the surface of the heating element. It is possible to prevent adhesion of scales and the like. Further, by increasing the flow velocity, the generation of bubbles can be reduced, the generation of scale can be suppressed, and the surface temperature of the copper pipe 17 of the sheathed heater 7 can be suppressed low, so the generation of boiling noise can be reduced. Can do.

  That is, the flow path 9 provided on the outer periphery of the heating element 7, the case 8 constituting the flow path 9, and the flow rate conversion means 10 for changing the flow speed at least in part of the flow path 9 are provided. Therefore, the deposits such as the scale generated on the surface of the heating element 7 can be peeled off by the flow velocity of the flow path 9, so that the adhesion can be reduced, and it is possible to realize a small size, high efficiency and long life. it can.

  In addition, by adopting a configuration in which the flow rate is changed in the direction of increasing the flow rate, the flow rate of the flow path 9 is accelerated, and deposits such as scale generated on the surface of the heating element 7 can be peeled off, thereby reducing adhesion. It can be small, achieve high efficiency and have a long life.

  In addition, although the sheath material of the sheathed heater 7 was demonstrated with the copper pipe 17, it has the same effect also with other materials, such as an iron pipe and a SUS pipe. The flow rate conversion means 10 has been described as a spring, but the same applies to a metal spring, a spiral wire having no spring property, or a resin-like shape. Furthermore, when used in a sanitary washing apparatus, the flow rate is about 100 to 2000 mL / min. Therefore, the outer diameter of the copper pipe 17 is about φ3 mm to φ20 mm, and the helical pitch is preferably about 3 mm to 20 mm. The inner diameter of the case 8 can be configured to increase the flow velocity in the range of φ5 mm to φ30 mm, and the flow velocity can be accelerated. Further, when a spring is used for the flow rate conversion means 10, the spring has a wire diameter of about φ0.1 mm to φ3 mm and is excellent in workability.

Further, since the spring 10 which is the flow rate conversion means is not completely fixed to the case 8 or the copper pipe 17 of the sheathed heater 7, it is received from the flow when a part of the spring 10 is held free of vibration. It is also possible to oscillate by a flow force and spring property, etc., and to make conditions that can further prevent scale adhesion. Although the pitch has been described as being constant, there is an effect of reducing scale adhesion by partially narrowing or widening the pitch, or by gradually changing the flow velocity to change the flow velocity.

(Embodiment 2)
FIG. 6 is a sectional view of a heat exchanger according to the second embodiment of the present invention. The difference from the first embodiment is that a spring 21 as a flow velocity converting means is provided in a part on the downstream side.

  And the operation | movement and an effect | action are demonstrated below.

  The water inlet 11 is attached in a direction eccentric from the side surface of the case 8 as in the first embodiment. Therefore, as shown in FIG. 6, the water that has entered the water flows while swirling along the cylindrical flow path 22 constituted by the case 8 and the copper pipe 17 of the sheathed heater 7, even upstream without the spring 21. The state will be sustained. However, when it is near the midpoint between the water inlet 11 and the outlet 12, the momentum of turning declines. If the cylindrical flow path 22 continues as it is, the swirl component disappears and the flow is in the axial direction. By installing a certain spring 21, the swirl flow path 23 can be configured and returned to the swirling flow. As a result, the flow velocity is increased, and scale adhesion downstream can be reduced.

  That is, on the upstream side, the flow path is widened because there is no spring 21 compared to the downstream side. As a result, the flow rate becomes slow. However, since the spring 21 is included on the downstream side, the cross-sectional area of the flow path 23 is narrow, and the flow velocity is faster than that on the upstream side. In this way, by increasing the flow velocity on the downstream side compared to the upstream side, it is possible to reduce the adhesion of scale on the downstream side. In particular, since the temperature of the water is higher toward the downstream side due to the heat exchange, and the surface temperature of the copper pipe 17 of the sheathed heater 7 becomes higher together with the water, the occurrence of scale increases. However, it is possible to reduce the adhesion of the scale by disposing the spring 21 as the flow velocity converting means on the downstream side.

  And since the spring 21 is arrange | positioned only to the half area | region of the whole flow path, the pressure loss of the whole heat exchanger can be decreased rather than arrange | positioning the spring 21 to the whole flow path.

  In addition, although it demonstrated by providing the spring 21 which is a flow velocity conversion means in the downstream part from the center, you may start from the upstream from the center, and if it is set as the structure moved according to the adhesion state of a scale, it can respond. . In addition, the pitch of the springs 21 can be freely changed, and in the case of tap water with no scale attached, the pitch can be widened to obtain a low pressure loss. For example, since the copper pipe 17 of the sheathed heater 7 that is a heating element is simply sandwiched by the O-ring 15, it can be easily removed and the pitch can be easily changed by removing the spring 21.

  Furthermore, as shown in FIG. 7, by disposing the springs 24, 25, and 26 that are the flow rate conversion means intermittently, the flow rate at which the flow rate is reduced can be increased. That is, in a sheathed heater using a long pipe, if a spring is arranged over the entire area, the pressure loss increases. Therefore, intermittently arranging the springs 24, 25, and 26 as shown in FIG. It is possible to reduce the adhesion of the scale by increasing the flow velocity.

  Even in the wakes 28 and 30 of the spring flow paths 27 and 29 that are intermittently arranged, the swirl flow continues for a while, so that even if there is a flow path area without a spring, it can be a swirl flow. Then, when the turning is weakened, the spring is arranged to generate the turning component again, thereby increasing the flow velocity.

  By disposing the springs 24, 25, and 26 as flow rate conversion means intermittently in this way, it can be applied to a long heat exchanger, and a long-life heat exchanger with low pressure loss and little scale adhesion can be realized. it can. In particular, when there is a bend like a U-shape, the U-shaped portion can be configured as a flow path without a spring, and a spring can be arranged in a straight portion, and a compact heat exchanger can be obtained.

  That is, at least a part of the flow path is narrowed, so that the flow velocity can be accelerated with a simple configuration, and the deposits such as the scale generated on the surface of the heating element 7 can be peeled off. It is possible to reduce the size, to realize a high efficiency with a small size and a long life.

(Embodiment 3)
FIG. 8 is a cross-sectional view of a heat exchanger according to the third embodiment of the present invention. The difference from the first embodiment is that, as a flow rate conversion means, instead of providing the spring 21, the case 31 is molded with resin, and the spiral rib 32 is integrally molded inside the case 31. There is.

  The operation and action will be described below.

  The water inlet 11 is attached in a direction eccentric from the side surface of the case 31 as in the first embodiment. Therefore, the water that has entered from the water inlet 11 flows into the outer periphery of the copper pipe 17 of the sheathed heater 7, and further, the spiral rib 32 is provided inside the case 31 that is spirally disposed along the outer periphery of the copper pipe 17. The copper pipe 17 is swirled around the outer periphery of the copper pipe 17 to flow into hot water, and is discharged from the discharge port 12 provided on the side surface.

  Here, the cross-sectional area of the flow path 33 constituting the pitch 6 between the spiral ribs 32 is narrower than the cross-sectional area of the substantially donut-shaped flow path formed between the case 31 and the copper pipe 17. It was made to turn at a pitch. As a result, the flow velocity of the swirling flow that flows along the spiral ribs 32 as the flow velocity conversion means becomes faster than that without the spiral ribs 32, and the flow velocity is accelerated.

  Therefore, the effect of reducing scale adhesion can be obtained as in the first embodiment. Moreover, it is not necessary to use the spring 10 as in the first embodiment, and the spiral rib 32 is integrally formed inside the case 31, so that the number of parts and assembly man-hours can be reduced.

  Further, FIG. 9 shows that the spring 21 of FIG. 6 described in the second embodiment is provided on the downstream side, and a spiral rib 35 serving as a flow rate conversion means is provided on the downstream side instead of the spring 21. The configuration is shown. Therefore, as in the case of FIG. 6, the operation and effect are reduced by reducing the overall pressure loss and increasing the flow velocity in the vicinity of the downstream flow path 36 where the scale adheres easily by the spiral ribs 35. Adhesion can be reduced. In addition, the number of parts and the number of assembly steps can be reduced.

  In other words, since the downstream side of the flow path is configured to be narrow, scale adhesion on the downstream side where scale adhesion is relatively likely to occur can be reduced, and the flow path of the entire area can be reduced rather than narrowing the overall flow path. Pressure loss can be reduced.

FIG. 10 shows a configuration in which spiral ribs 37, 38, 39, which are flow velocity conversion means, are provided intermittently instead of the springs 24, 25, 26 of FIG. 7 described in the second embodiment. Therefore, as in the case of FIG. 7, the operation and effect are reduced by the spiral ribs 37, 38, 39 while reducing the overall pressure loss and increasing the flow velocity at the point where the swirl flow velocity is slow and the scale adheres easily. Thus, adhesion of scale can be reduced. In addition, the number of parts and the number of assembly steps can be reduced.

  In other words, the configuration in which the cross section of the flow path becomes narrower gradually toward the downstream side of the flow path, the flow velocity is intermittently increased toward the downstream where scale adhesion is likely to occur, and the scale adheres effectively. Can be reduced, and the pressure loss of the flow path can be reduced as compared with narrowing the flow path in the entire area.

  Further, FIG. 11 is configured such that the pitch of the spiral rib 41 serving as the flow velocity converting means becomes gradually narrower from the upstream side to the downstream side. Therefore, the flow velocity increases continuously as it goes downstream, where scale adhesion is likely to occur, and scale adhesion can be effectively reduced. Can be reduced.

  FIG. 11 shows a configuration in which the pitch of the spiral rib 41 that is the flow velocity converting means is gradually narrowed from the upstream side to the downstream side, but the spiral rib of the inner cylindrical portion of the case 40 is configured. Even if the cylinder has a taper and the inner diameter of the cylinder gradually decreases toward the downstream side, the flow velocity increases continuously toward the downstream side where scale adhesion is likely to occur, and the vicinity of the flow path 42 The adhesion of scale can be reduced.

(Embodiment 4)
FIG. 12 is a cross-sectional view of a heat exchanger according to the fourth embodiment of the present invention. The difference from the first embodiment is that, instead of providing the spring 21, the second water inlet 44 is arranged downstream of the water inlet 11 of the case 43 to increase the flow speed as the flow speed conversion means. is there.

  The operation and action will be described below.

  Similarly to the water inlet 11, the second water inlet 44 is attached in a direction eccentric from the side surface of the case 43. Therefore, the water that has entered through the water inlet 11 flows into the outer periphery of the copper pipe 17 of the sheathed heater 7, and further flows while spirally turning along the outer periphery of the copper pipe 17, and the state is maintained. However, when it is near the midpoint between the water inlet 11 and the outlet 12, the momentum of turning declines. If the cylindrical flow path 45 continues as it is, the swirl component disappears and the flow in the axial direction is lost. However, in the vicinity of the center where the swirl begins to decay, that is, in the vicinity of the center where the flow velocity becomes slow, the second flow velocity conversion means. By providing the water inlet 44, the turning flow velocity can be increased. As a result, the flow velocity of the surface of the copper pipe 17 of the sheathed heater 7 is increased, and scale adhesion downstream can be reduced.

  Therefore, the effect of reducing scale adhesion can be obtained as in the first embodiment. Moreover, it is not necessary to use the spring 10 as in the first embodiment, the pressure loss in the flow path 45 is small, and the number of parts and assembly man-hours can be reduced.

  That is, by arranging a plurality of water inlets 11 and 44 in the downstream direction from the upstream of the flow path 45 to increase the flow velocity, the downstream flow velocity at which scale adhesion is likely to occur is increased, and scale adhesion is reduced. In addition, since the flow path is not narrowed, the pressure loss of the flow path 45 can be reduced.

In the above description, the water inlets 11 and 44 have been described to increase the swirl flow velocity in a configuration in which water flows in by being eccentric to the flow path 45 of the case 43. Even when it is not eccentric, the flow rate and the flow velocity are increased from the middle by adding water from the water inlet 44 to the water flow from the water inlet 11. Therefore, even if the water inlet 44 is not eccentric as the flow rate conversion means, the flow velocity on the surface of the copper pipe 17 of the sheathed heater 7 is increased, and scale adhesion downstream can be reduced.

  Further, the flow rate of the water in the flow path 45 can be accelerated even if other fluid, for example, a gas such as air, is introduced from the water inlet 44 instead of water. That is, at the moment when air enters the water flow from the water inlet 11 at the moment when the air enters from the water inlet 44, the water in the flow path 45 acts so as to be rapidly pushed out from the discharge port 12 for the volume of the air. . Therefore, when air is intermittently supplied from the water inlet 44 to the flow path 45 by an air pump or the like, the flow velocity on the surface of the copper pipe 17 of the sheathed heater 7 is intermittently increased, and scale adhesion downstream can be reduced. In addition, functions and additional functions such as the ability to intermittently adjust the flow velocity discharged from the discharge port 12 are obtained. In the case of gas, the specific heat is orders of magnitude smaller than that of water, so there is no worry of taking away the heat from the sheathed heater 7 or water.

  In other words, the configuration in which another fluid is introduced into the flow path 45 to increase the flow velocity can add the value effect of the other fluid, and at the same time, reduce the adhesion of the scales in a two-stone manner. In addition, by using another fluid as a gas, it is possible to increase the flow rate of water without reducing heat and reduce the adhesion of scale.

(Embodiment 5)
FIG. 13 is a sectional view showing a sanitary washing device according to a fifth embodiment of the present invention. And it is the structure of the sanitary washing apparatus using the heat exchanger in any one of Embodiment 1-4, and the heating toilet seat 52 and the sanitary washing apparatus main body 53 are installed on the toilet bowl 51. FIG. And the heat exchanger 54 is provided in the sanitary washing apparatus main body 53, and the heat-exchanged hot water is ejected from the washing nozzle 55 to wash the local part of the human body 56. And in the sanitary washing apparatus main body, the cutoff valve 57 and the flow control apparatus 58 are provided as main components. Other parts such as the control board are omitted.

  In such a sanitary washing device, a small heat exchanger with little scale adherence is built in the main body of the sanitary washing device, so that the main body can be downsized and the heat exchanger can be sanitized without clogging with the scale. The lifetime of the cleaning device can be extended, and a sanitary cleaning device having a stable cleaning operation as well as a heat exchanger can be obtained.

  In particular, by providing the flow path on the outer periphery of the heating element, the heat insulation is performed by the flow path, so it is not necessary to provide a thermal insulating layer, and the size can be reduced, and the outer periphery of the heating element is surrounded by the flow path. By using a heat exchanger that hardly releases heat to the outside of the case, it is possible to realize a small sanitary washing device with less energy loss and energy saving.

  As described above, in the heat exchanger according to the present invention, the flow rate conversion means is installed in the flow path provided on the outer periphery of the heating element, whereby the fluid flow rate in the flow path is accelerated and the scale generated on the surface of the heating element The deposits can be reduced, and the device can be small, achieve high efficiency and have a long life. And the sanitary washing apparatus using it can implement | achieve energy saving, size reduction, and can be set as a long-life apparatus.

Sectional drawing of the heat exchanger in Embodiment 1 of this invention Cross section of the heat exchanger Side cross-sectional view of the heat exchanger Flow distribution diagram in the heat exchanger Flow distribution diagram in the heat exchanger Sectional drawing of the heat exchanger in Embodiment 2 of this invention Sectional drawing of the heat exchanger which shows the other Example of the same heat exchanger Sectional drawing of the heat exchanger in Embodiment 3 of this invention Sectional drawing of the heat exchanger which shows the other Example of the same heat exchanger Sectional drawing of the heat exchanger which shows the other Example of the same heat exchanger Sectional drawing of the heat exchanger which shows the other Example of the same heat exchanger Sectional drawing of the heat exchanger in Embodiment 4 of this invention Sectional drawing of the sanitary washing apparatus in Embodiment 5 of this invention Cross section of conventional heat exchanger

7 Heating element (seeds heater)
8 Case 9 Flow path 10 Flow rate conversion means (spring)
11 Water inlet 12 Discharge port 21 Flow rate conversion means (spring)
23 Flow path 24, 25, 26 Flow rate conversion means (spring)
31 Case 32 Flow rate conversion means (rib)
33 Flow path 34 Case 35 Flow rate conversion means (rib)
36 Flow path 37, 38, 39 Flow rate conversion means (rib)
40 Case 41 Flow rate conversion means (rib)
42 Channel 43 Case 44 Flow rate conversion means (rib)
45 Flow path 53 Sanitary washing device 54 Heat exchanger

Claims (3)

A flow path provided on the outer periphery of the heating element;
A case surrounding the flow path;
A flow rate conversion means for changing the flow rate at least in a part of the flow path ,
The heat flow rate conversion means has a configuration in which a plurality of water inlets are arranged in the downstream direction from the upstream side of the flow path to increase the flow rate . A flow path provided on the outer periphery of the heating element;
A case surrounding the flow path;
A flow rate conversion means for changing the flow rate at least in a part of the flow path,
The heat flow rate converter is configured to increase the flow rate by allowing another fluid to flow into the flow path . A sanitary washing device comprising the heat exchanger according to claim 1 or 2 .

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