JP2007147110A - Heat exchange device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain an internal pressure of a circulation passage lower than an internal pressure of a hot water storage tank 2 in a heat exchange device heating bathtub water passing through the circulation passage as a heat source for hot water of the hot water storage tank 2. <P>SOLUTION: The heat source device is provided by incorporating a bath heat exchanger 49 in the circulation passage wherein water of a bathtub 3 is passed through an external return pipe 44, a circulating pump 12, an internal outgoing pipe 43, a three way valve 48, the bath heat exchanger 49, an internal outgoing pipe 43 of a passage 54 side, and an external outgoing pipe 45 in this order, and returned to the bathtub 3. The bath heat exchanger 49 leads the hot water of the hot water storage tank 2 through a hot water supply external passage 21, a hot water internal lead-in pipe 25, and a heat exchange heat source pipe 50, and heat exchange heating of the hot water led in from the hot water storage tank 2 with the bathtub water passing through the circulation passage, is carried out through the circulation passage in the bath heat exchanger 49. A blow valve 70 is provided in an outer side position of the hot water storage tank 2 in the circulation passage. The blow valve 70 blows out the bathtub water passing through the circulation passage when the pressure in the circulation passage exceeds a set pressure lower than the pressure in the hot water storage tank 2 to adjust the internal pressure of the circulation passage such that it does not exceed the set pressure. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchange device that heats and heats a circulating fluid such as bathtub water and heating hot water using hot water in a hot water tank as a heat source.

  FIG. 4 shows an example of a hot water supply and hot water filling system in which a heat exchange device is incorporated. The system shown in FIG. 4 is a conventional electric water heater system, and has a hot water supply function and a hot water filling function.

  The hot water supply / hot water filling system shown in FIG. 4 accommodates a hot water storage tank 2 and a functional component for performing hot water supply to the outside and hot water filling to the bathtub 3 in the case 1. Hot water is stored. This hot water is made by using an appropriate hot water supply source such as electric energy, gas combustion energy, cogeneration, etc., and the hot water is stored in the hot water tank 2. When hot water is drawn from 2 and used, an amount of hot water corresponding to the amount used is created and replenished.

  The functional component includes a hot water supply function unit and a hot water filling function unit. The hot water supply function unit has a function of drawing out the hot water in the hot water storage tank 2 through the hot water supply passage 4, mixing the hot water with the water supply by the mixing valve 17 and adjusting the hot water temperature, and supplying the hot water to the outside. It is led to the shower 5. In the illustrated example, the hot water filling function unit is an auto type hot water filling function unit. The auto-type hot water filling function unit draws hot water from the hot water tank 2 through the water channel 7 and mixes with hot water at the mixing valve 11 to adjust the hot water temperature, and then drops it into the bathtub 3 through the bath water circulation channel 8. The amount of dropped water is detected by the flow rate counter 9, the bathtub water level is detected by the water level sensor 10, and when the detected water level reaches the set water level, the dropping of hot water is stopped and the filling of the hot water is finished. is there.

  The circulating heating of the bathtub water, which is the fluid to be heated, is performed by driving the bathtub water circulation pump 12 to circulate the hot water in the bathtub 3 through the circulation path 8 via the hot water tank 2. This bath water circulation path 8 is formed by a pipe line that returns to the bathtub 3 through the bathtub 3, the return pipe 13 having the circulation pump 12, the three-way valve 15, the spiral pipe 16, and the forward pipe 14. When the bath water is heated, the circulation pump 12 is driven and circulated from the return pipe 13 side of the hot water tank 2 to the bathtub 3 through the forward pipe 14. At this time, the three-way valve 15 is switched to the spiral pipe 16 side, By passing through the spiral tube 16, heat is exchanged with hot water in the hot water tank 2, the hot water temperature of the circulating water is raised and returned to the bathtub 3, and the circulating heating of the bathtub water is performed. The operation of each function of these functional components is controlled by a control device (not shown).

  In general, since hot water is supplied to the hot water tank 2 using tap water as a water supply source, the pressure in the hot water tank 2 is 0.1 MPa or more after the pressure reducing valve. On the other hand, the total stroke of the circulation pump 12 is as follows. Since it is about 10 m (0.1 MPa) and 0.05 MPa or less in a normal use state, and the pressure in the hot water tank 2 is larger than the pressure in the circulation path 8, a microcrack is formed in the spiral pipe 16 in the hot water tank 2. Even if damage such as a pinhole occurs, it is considered that sewage flowing through the circulation path 8 is prevented from being mixed into the hot water tank 2.

  However, for example, when the circulation path 8 is closed for some reason, and the circulation pump 12 is driven in this state to perform the circulation heating operation of the bath water, the internal pressure of the circulation path 8 is set to the hot water tank 2. This causes a problem that the sewage passing through the circulation path 8 leaks into the hot water storage tank 2 storing hot water. It may be possible to avoid such a problem by providing a pressure reducing valve for suppressing overpressure in the circulation path 8 in the circulation path 8, but such a pressure reducing valve is expensive and has a flow direction. Troubles such as one side during hot water transfer and time required for bath pouring occur.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to heat the heated fluid by heat exchange using the hot water in the hot water tank as a heat source from the pipe for circulating the heated fluid in the hot water tank. It is an object of the present invention to provide a heat exchange device using hot water in a hot water storage tank as a heat source, in which circulating fluid does not leak into the hot water and the hot water in the hot water storage tank is not contaminated.

  In order to achieve the above object, the present invention has the following configuration as means for solving the problems. That is, the first invention has a hot water storage tank for storing hot water, and a circulation path through which the fluid to be heated is circulated is connected to the hot water storage tank and filled with the hot water in the hot water storage tank. The heated fluid passing through the circulation path is heated by exchanging heat with the hot water in the heat source container, and the circulation path is provided with a pressure breaking means in a path outside the heat source container. Means for solving the problem has a configuration in which the destruction means maintains the pressure in the circulation path below the set pressure by breaking the pressure when the pressure in the circulation path exceeds a set pressure lower than the pressure in the hot water tank. It is made.

  The second invention comprises the configuration of the first invention, wherein the pressure breaking means is a blow valve, and the blow valve has a set pressure in which the pressure in the circulation path is lower than the pressure in the hot water storage tank. When heated, the fluid to be heated is ejected to maintain the pressure in the circulation path below the set pressure.

  Furthermore, the third invention has a hot water storage tank for storing hot water, and a circulation path through which the fluid to be heated is circulated is connected to the hot water storage tank and filled with the hot water of the hot water storage tank. The heated fluid passing through the circulation path is heated by exchanging heat with the hot water in the heat source container, and the circulation path detects the pressure in the circulation path and the circulation pump for circulating the heated fluid in the circulation path. A pressure detection sensor, and the circulating pump is a pump capable of changing the pressure in the circulation path by controlling the rotational speed, and the rotational speed is controlled by the rotational speed control means. As means for solving the problems, the pressure detection information of the pressure detection sensor is taken in and the number of rotations of the circulation pump is controlled so that the detected pressure is maintained at a set pressure lower than the pressure in the hot water tank. Yes.

  Furthermore, the fourth invention is characterized in that, in addition to the configuration of the third invention, the circulation pump is configured by a DC pump.

  Further, the fifth invention has a hot water storage tank for storing hot water, and a circulation path through which the fluid to be heated is circulated is communicated with the hot water storage tank and filled in the hot water of the hot water storage tank. The heated fluid passing through the circulation path is heated by exchanging heat with the hot water in the heat source container, and the circulation path detects the pressure in the circulation path and the circulation pump for circulating the heated fluid in the circulation path. A pressure detection sensor, and has a control means for stopping driving of the circulation pump when the detection pressure of the pressure detection sensor exceeds a set pressure lower than the pressure in the hot water tank. It is a means to solve the problem.

  Furthermore, the sixth invention includes the configuration of any one of the first to fifth inventions, the circulation path is a pipe that circulates bathtub water, and the heat source container is bathtub water that passes through the circulation path. It is characterized in that it constitutes a bath heat exchanger that heats by heat exchange.

  Further, the seventh invention is provided with the configuration of any one of the first to sixth inventions, and a part of the circulation path is formed through a hot water storage tank, and the hot water storage tank also serves as a heat source container. It is characterized by being.

  In the present invention, a circulation path through which a heated fluid circulates is passed through a heat source container filled with hot water in a hot water storage tank, and the heated fluid passing through the circulation path exchanges heat with hot water in the heat source container and heats it. When the pressure in the circulation path reaches a set pressure (pressure destruction reference pressure) lower than the internal pressure of the hot water tank, the pressure is destroyed by the pressure breaking means, or the pressure in the circulation path is reduced in the hot water tank. The rotation speed of the circulation pump in the circulation path is controlled so as to maintain a set pressure lower than the internal pressure (control target pressure), or a set pressure where the pressure in the circulation path is lower than the internal pressure of the hot water tank (pump stop reference pressure) Since the circulation pump is stopped when exceeding the pressure, the internal pressure of the circulation path is adjusted to be lower than the internal pressure of the hot water tank (so that the internal pressure of the circulation path does not reach the internal pressure of the hot water tank) Even if the circuit is blocked for some reason Even if the circulation pump is driven under this condition, the internal pressure of the circulation path does not exceed the set pressure lower than the internal pressure of the hot water tank, so that there is no damage such as microcracks or pinholes in the circulation path in the heat source container. Even if it occurs, it is possible to reliably prevent the heated fluid passing through the circulation path from being mixed and contaminated in the hot water on the hot water storage tank side, and to improve the hygiene safety reliability.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same components as those in the system of FIG. 4 are denoted by the same reference numerals, and redundant description is omitted or simplified. FIG. 1 shows a first embodiment of a heat exchange apparatus according to the present invention in a state where it is incorporated in a hot water supply / hot water filling system. The system of FIG. 1 is configured as a separate body in which the hot water tank 2 and the functional component are separated. The functional component is accommodated in the case 20, and the hot water tank 2 is installed outside the case 20. Although the illustrated case 20 has a box shape, the shape of the case is not particularly limited to this, and the case material may be an appropriate material such as metal, synthetic resin, or wood.

  The hot water tank 2 and the functional component are connected by a total of two pipe lines, one hot water supply external pipe 21 and one external water conduit 22. The hot water supply pipe 21 has an outlet end (inlet end) connected to the upper part (upper end in the illustrated example) of the hot water tank 2, and an outlet end connected to an inner hot water supply pipe 25 in the case 20 via a joint 24. ing. Further, the outlet end of the external water conduit 22 is connected to the lower part (lower end in the illustrated example) of the hot water tank 2, and the inlet end is connected to the outlet end of the water supply internal conduit 26 via the joint 24. The inlet end of the water supply internal conduit 26 is connected to a water supply external conduit 23 through which water is introduced from the outside via a joint 24. A filter 27, a check valve 28, a pressure reducing valve 29, a check valve 30 as a backflow prevention means, and a pressure relief valve 31 are provided in this water supply internal conduit 26 in order from the inlet end to the outlet end. .

  The inlet end of the branch connection pipe 32 is connected to the water supply internal pipe line 26 between the pressure reducing valve 29 and the check valve 30, the outlet side of the branch connection pipe 32 is branched into two, and one branch outlet end is It is connected to the water supply port of the hot water mixing plug 33, and the other branch outlet end is connected to the water supply port of the hot water mixing plug 34. The hot water inlets of the hot water mixer tap 33 and the hot water mixer tap 34 are respectively connected to the branch pipe of the hot water inner inlet pipe 25. The hot water mixing tap 33 and the hot water mixing tap 34 are for mixing hot water and hot water of hot water supply to create hot water having a set hot water temperature (adjusting the hot water temperature). To do. The outlet side of the hot water supply internal water supply pipe 35 and the inlet side of the hot water supply external water supply pipe 36 are connected by the joint 24, and the hot water produced by the hot water supply mixing tap 34 is guided to the external hot water supply external water supply pipe 36 through the hot water supply internal water supply pipe 35. ing. The hot water supply external water supply pipe 36 is led to a desired hot water supply destination, and is led to the shower 5 in the illustrated example. The hot water supply internal water supply pipe 35 is provided with a flow sensor (flow rate sensor) 37 for detecting the amount of hot water and a hot water temperature sensor 38 such as a thermistor for detecting the hot water temperature.

  The inlet end of the internal hot water pipe 39 is connected to the outlet of the hot water mixing plug 33 (the outlet of the hot water of the set hot water temperature created by mixing hot water and hot water). The outlet is connected to the water channel in the bathtub water circulation path. The internal hot water filling pipe 39 is provided with a flow sensor 40 for detecting the pouring amount of pouring and an edge valve unit 41 for preventing sewage from the bathtub 3 side from entering the hot water supply side pipe line. Yes. The edge cut valve unit 41 is formed by a serially connected body of a pouring electromagnetic valve 72 and a plurality (two in the figure) of check valves. The water path of the bath water circulation path portion is configured to have an internal return pipe 42 and an internal forward pipe 43, and the inlet end of the internal return pipe 42 is connected to the outlet end of the external return pipe 44 via the joint 24, The outlet end of the internal return pipe 42 is connected to the suction port of the bath water circulation pump 12. The inlet end of the inner outgoing pipe 43 is connected to the discharge port of the circulation pump 12, and the outlet end of the inner outgoing pipe 43 is connected to the inlet end of the outer outgoing pipe 45 via the joint 24. The inlet end of the external return pipe 44 and the outlet end of the external forward pipe 45 are connected to the bathtub 3 in communication. In the internal forward pipe 43, a water level sensor 10 for detecting the water level of the bathtub 3 by water pressure, a bath temperature sensor 46 such as a thermistor for detecting the temperature (bath temperature) of the bath water, and a heat exchange heating temperature of the bath water are detected. A temperature sensor 47 such as a thermistor is provided.

  A bath heat exchanger 49 for heating the bath water as the fluid to be heated is connected to the inner outgoing pipe 43. This bath heat exchanger 49 has a structure of a so-called water-water heat exchanger that heats the hot water energy from the hot water tank 2 by giving it to the bathtub water passing through the water passage of the bathtub water circulation section. The hot water in the hot water storage tank 2 is introduced into the bath heat exchanger 49 by a heat exchange heat source pipe 50 connected to the hot water supply internal introduction pipe 25. Specifically, a heat exchange pump 51 is interposed in the heat exchange heat source pipe 50 between the hot water supply introduction pipe 25 and the bath heat exchanger 49, and the heat exchange pump 51 is driven to drive the heat exchange pump 51. Hot water is introduced into the bath heat exchanger 49 through the hot water supply external pipe 21, the hot water supply introduction pipe 25, and the heat exchange heat source pipe 50. The outlet of the heat exchanger heat source pipe 50 is connected to the inlet end of the return water passage 52, and the outlet end of the return water passage 52 is connected to the water supply inner pipe 26 between the check valve 30 and the pressure relief valve 31. The return water passage 52 is provided with a check valve 75 as a backflow prevention means for preventing the water supplied from the water supply external conduit 23 through the water supply internal conduit 26 from flowing to the bath heat exchanger 49 side.

  The bath water is introduced into the bath heat exchanger 49 through the bath water circulation pipe 53 via a three-way valve 48 that functions as a flow path switching valve. That is, a three-way valve 48 is interposed in the internal forward pipe 43 between the bath temperature sensor 46 and the temperature sensor 47, and this three-way valve 48 flows from the bathtub water circulation pump 12 side toward the three-way valve 48. The bathtub water is selectively switched between the pipe 54 side and the inlet side of the bathtub water circulation pipe 53, and the three-way valve 48 switches the flow path to the bathtub water circulation pipe 53 side so that the bathtub water is bath heat exchanger 49. It is introduced in.

  A blow valve 70 that functions as a pressure breaking means is provided in a pipe line from the three-way valve 48 to the bath heat exchanger 49. When the pressure of the bath water entering the bath heat exchanger 49 through the bath water circulation pipe 53 exceeds the set pressure (pressure destruction reference pressure) of the blow valve 70, the blow valve 70 drains water (hot water) in the pipe line. It has a function of adjusting the pressure so that the jetting pressure and the pipe internal pressure do not exceed the set pressure. In the present embodiment example, this set pressure is set to a pressure lower than the pressure in the hot water tank 2, that is, the pressure in the volume expanding section 55 (see FIG. 3). The outflow end of the bathtub water circulation pipe 53 is connected to the internal forward pipe 43 of the part where the temperature sensor 47 is provided, and the heated bathtub water after heat exchange by the bath heat exchanger 49 is the bathtub. From the outlet of the water circulation pipe 53, the pipe enters the internal forward pipe 43 on the pipe 54 side and is returned to the bathtub 3. This bathtub 3, external return pipe 44, internal return pipe 42, circulation pump 12, internal forward pipe 43, three-way valve 48, bathtub water circulation pipe 53, bath heat exchanger 49, internal forward pipe 43 on the pipeline 54 side, A pipe line that returns to the bathtub 3 through the external forward pipe 45 in order forms a circulation path of the bathtub water. And the heat exchanger of bathtub water is comprised by the bath heat exchanger 49 containing the circulation path of this bathtub water, and the heat exchanger heat source pipe 50. FIG.

  One structural example of the heat exchange part of the bath heat exchanger 49 is shown in FIG. As shown in the figure, in the area of the bath heat exchanger 49, the heat exchange heat source pipe 50 is provided with a volume expanding portion 55 that functions as a heat source container. The circulation pipe 53 is passed through, and the energy of the hot water introduced from the hot water storage tank 2 side in the volume expansion section 55 is given to the bathtub water passing through the volume expansion section 55 through the bathtub water circulation pipe 53, so-called. Water-water heat exchange takes place. The bathtub water heated and heated by this heat exchange is returned to the bathtub 3 as described above, and the hot water of the heat exchange heat source pipe 50 whose temperature has been lowered after the heat exchange is supplied from the return water path 52 to the water supply internal pipe as described above. 26, the structure is returned to the hot water tank 2 through the external water conduit 22.

  In this embodiment, the hot water supply / hot water filling system further incorporates a heat exchange device for hot water heating that heats and heats hot water for hot water heating using the hot water in the hot water storage tank 2 as a heat source. This heat exchange device for hot water heating is constituted by a heating heat exchanger 56 and a hot water circulation path for hot water heating. The hot water circulation path for the hot water heating has an internal heating circulation path 57, an external forward side pipe 68 and an external return side pipe 69. The water channel portion of the hot water circulation path of the hot water heating in the case 20 is constituted by an internal heating circulation path 57 via a heating heat exchanger 56, and a heating circulation pump 58 is interposed in the internal heating circulation path 57, On the return end side of the internal heating circulation path 57, a cistern 59 is provided. The cistern 59 is provided with a low water level detection electrode 60 for detecting a low water level in the cistern 59 and a high water level detection electrode 61 for detecting a high water level. The cistern 59 is connected to an outlet end of a water amount replenishing pipe 62 for replenishing the amount of hot water in the cistern 59, and an inlet end of the water amount replenishing pipe 62 is connected to the outlet end side of the heat exchanger heat source pipe 50. A water amount replenishing electromagnetic valve 63 is interposed in the water amount replenishing pipe 62.

  Further, an outward heating temperature sensor 64 such as a thermistor for detecting the temperature of the outgoing heating hot water is provided at the outgoing position of the internal heating circuit 57, and the return hot water is provided at the return side of the internal heating circuit 57. A return-side heating temperature sensor 65 such as a thermistor for detecting the temperature of the heater is provided, and a blow valve 66 as a pressure breaking means is provided in a pipe line from the discharge position of the heating circulation pump 58 to the heating heat exchanger 56. Yes. The blow valve 66 ejects water (warm water) in the pipe line when the pressure of the hot water circulating in the internal heating circuit 57 exceeds the set pressure (pressure destruction reference pressure), and the pipe pressure does not exceed the set pressure. Thus, the pressure is adjusted. In the present embodiment, this set pressure is set to a pressure lower than the pressure in the hot water tank 2, that is, the pressure in the volume expanding portion (heat source container) 55.

  The heating heat exchanger 56 is configured as a so-called water-water heat exchanger in which the hot water energy from the hot water storage tank 2 is supplied to the heated hot water passing through the internal heating circuit 57 and heated as in the bath heat exchanger 49. The hot water in the hot water storage tank 2 as a heating source is introduced into the heating heat exchanger 56 by a heat exchange heat source pipe 50 connected to the hot water supply internal introduction pipe 25. As shown in FIG. 3, the configuration of the heat exchange part of the heating heat exchanger 56 is passed through an internal heating circulation path 57 through a volume expansion part 55 as a heat source container. The energy of the hot water introduced from the hot water storage tank 2 side is given to the heating hot water passing through the volume expansion section 55 through the internal heating circulation path 57, and so-called water-water heat exchange is performed.

  The forward end of the internal heating circuit 57 is connected to the external forward line 68 of the floor heating piping 67 via the joint 24, and the return side end of the internal heating circuit 57 is connected to the external return side pipe via the joint 24. It is connected to the path 69. The pipe that returns from the floor heating piping 67 to the external heating return pipe 69, the cistern 59, the heating circulation pump 58, the heating heat exchanger 56, and the external forward piping 68 in this order is returned to the floor heating piping 67. It constitutes a circulation path of hot water that is a heating fluid.

  In this embodiment, the bath heat exchanger 49 and the heating heat exchanger 56 are combined to form a combined heat exchanger 71 that is integrated into a unit, and this combined heat exchanger 71 is shown in FIG. ), (C), the hot water in the hot water storage tank 2 introduced from the heat exchange heat source pipe 50 is filled in the volume expansion section 55 (55a, 55b), and the hot water storage tank 2 introduced from the heat exchange heat source pipe 50 The hot water in the bathtub water circulation pipe 53 and the hot water for heating in the internal heating circulation path 57 that pass through the volume expansion section 55 (55a, 55b) are heated using no hot water as a common heating source. 3 (b) shows the common volume expansion part 55 penetrated through the bathtub water circulation pipe 53 and the internal heating circulation path 57, and FIG. 3 (c) shows the water path of the heat exchange heat source pipe 50 in parallel. The volume expansion portions 55 (55a) and 55 (55b) are provided in the respective branch water passages, the volume expansion portion 55a penetrates the bathtub water circulation pipe 53, and the volume expansion portion 55b has an internal heating circulation path 57. The bath water and the heating hot water are heat exchange heated by separate volume expansion portions 55a and 55b.

  In the system of FIG. 1, the functional configuration unit includes a hot water supply function unit, a hot water filling function unit, and a hot water heating function unit. The hot water supply function unit has a hot water supply channel that guides hot water from the hot water supply introduction pipe 25 to the hot water supply pipe 35 and the hot water supply pipe 35 to the hot water supply external pipe 21 in order. Hot water is returned to the outside through the hot water supply internal introduction pipe 25 through the pouring mixer tap 33, the internal hot water filling pipe 39, the internal return pipe 42 and the internal forward pipe 43, and the recirculating water passage portion in that order. A hot water channel leading to the pipe 44 and the external forward pipe 45 is provided. The hot water heating function unit includes the internal heating circuit 57 in which the heating heat exchanger 56 is interposed.

  The operation control of the functional components is performed by a control device (not shown), and the operations of the hot water supply function unit, the hot water filling function unit, and the hot water heating function unit will be described below. The hot-water supply operation of the hot-water supply function unit starts when the hot-water supply stopper is opened. In FIG. 1, when the shower 5 is opened, the water pressure in the hot water tank 2 becomes the water pressure (because the water supply is introduced into the water supply external conduit 23 using the water as a water source). The hot water in 2 enters the hot water mixing tap 34 from the hot water supply external pipe 21 through the hot water supply introduction pipe 25. Since hot water is supplied to the hot water mixing tap 34 through the branch connection pipe 32, the hot water and the hot water are mixed to produce a hot water having a set temperature. The water pipe 35 is led to the shower 5 through the hot water supply external water supply pipe 36 to use hot water. When the tap of the shower 5 is closed, the hot water flow stops and the hot water supply operation ends.

  The hot water filling operation of the hot water filling function unit is started by opening the hot water solenoid valve 72 incorporated in the edge cut valve unit 41. When the hot water solenoid valve 72 is opened, the hot water in the hot water storage tank 2 enters the hot water mixing plug 33 through the hot water supply introduction pipe 25. In the pouring mixer tap 33, the hot water and the hot water supplied through the feed water external pipe 23 and the branch connection pipe 32 are mixed so as to have a preset pouring temperature. Is produced. This pouring hot water passes through the internal hot water filling pipe 39, passes through both the internal return pipe 42 and the internal forward pipe 43, and further drops into the bathtub 3 through the external return pipe 44 and the external forward pipe 45. Is included. When the hot water is filled, the amount of dropped water is detected by the flow sensor 40 and the water level of the bathtub 3 is detected by the water level sensor 10, and it is detected by the water level sensor 10 that the dropped water level has reached a preset water level. Sometimes the hot water solenoid valve 72 is closed and the hot water filling operation is completed.

  The bath water temperature detection operation is performed by connecting the pipe 54 side to the internal forward pipe 43 by a three-way valve 48 and driving the bath water circulation pump 12. By driving the circulation pump 12, the hot water in the bathtub 3 is returned to the external return pipe 44, the internal return pipe 42, the circulation pump 12, the internal forward pipe 43, the three-way valve 48, the internal forward pipe 43 on the pipe 54 side, and the external forward pipe 45. The water is circulated back to the bathtub 3 in order, and the hot water temperature of the circulating water is detected by the bath temperature sensor 46.

  The bath water heating operation is performed by switching the pipe 54 to the bath water circulation pipe 53 by the three-way valve 48 and driving the circulation pump 12. By driving the circulation pump 12, the bathtub water is stored in the bathtub 3, external return pipe 44, internal return pipe 42, bathtub water circulation pump 12, internal forward pipe 43, three-way valve 48, bathtub water circulation pipe 53, bath heat exchanger. 49 circulates in the circulation path which returns to the bathtub 3 through the internal forward pipe 43 and the external forward pipe 45 on the side of the pipeline 54 in order. This bath circulating water is heated by the bath heat exchanger 49 by exchanging heat with hot water supplied from the hot water tank 2. The hot water temperature of the circulating water is detected by the bath temperature sensor 46. When the detected temperature reaches a preset bath temperature, the circulating pump 12 is stopped and the heating operation of the bath water is ended.

  The heating operation of the hot water heating function unit is performed by starting (driving) the heating circulation pump 58. By driving the heating circulation pump 58, the hot water in the floor heating piping 67 passes through the external return side pipe 69, the cistern 59, the heating circulation pump 58, the heating heat exchanger 56, and the external forward side pipe 68 in this order. Circulating the hot water circulation path, the heated hot water is heated and heated by the heating heat exchanger 56, and the heated hot water is led to the floor heating pipe line 67 to heat the area where the floor heating pipe line 67 is laid. Is done. The hot water temperature on the return side of the circulating hot water is detected by the return side heating temperature sensor 65, and the hot water temperature on the outgoing side is detected by the outgoing side heating temperature sensor 64. Based on the detected hot water temperature information, the hot water temperature is detected according to the given control program. Heating operation is controlled.

  In addition, when the low water level in the cistern 59 is detected by the low water level detection electrode 60 of the cistern 59 during the heating operation, the water amount replenishing electromagnetic valve 63 is opened and the heat exchange after the heat is exchanged by the heating heat exchanger 56 is performed. Hot water from the heat source pipe 50 is replenished into the cistern 59 through the water quantity replenishment pipe 62. When the high water level in the cistern 59 is detected by the high water level detection electrode 61, the water amount replenishing electromagnetic valve 63 is closed, and the water amount replenishing operation is stopped.

  According to this embodiment, a blow valve 70 is provided outside the bath heat exchanger 49 in the bath water circulation path, and a blow valve 66 is provided outside the heating heat exchanger 56 in the heating hot water circulation path. Therefore, even if these circulation paths are closed for some reason (including a state close to blockage), the circulation pumps 12 and 58 are driven to increase the pressure in the circulation path. When the pressure exceeds the set pressure (pressure destruction reference pressure) of the blow valves 70 and 66, the circulating water spouts and pressure destruction occurs. Therefore, the internal pressure of the circulation path is the internal pressure of the hot water tank 2, that is, the internal pressure of the volume expanding portion 55. Therefore, even if an abnormality such as a microcrack or a pinhole occurs in the circulation path in the heat exchangers 49 and 56, the hot water in the volume expansion section 55 communicating with the hot water storage tank 2 from the circulation path. (Hot water in hot water tank 2) Sewage circulating roadside leakage (backflow) can not, it is possible to surely prevent contamination of the hot water in the hot water storage tank 2.

  FIG. 2 shows a second embodiment of the heat exchange apparatus according to the present invention. In the second embodiment, the pressure in the circulation path is detected by a pressure detection sensor, and the internal pressure of the circulation path is lower than the internal pressure of the hot water tank 2 (internal pressure of the volume expanding portion 55) based on the information of the detected pressure. The number of rotations of the circulation pump 12 (58) is controlled so as to be a set pressure (control target pressure), and other configurations are the same as those in the first embodiment, and the same parts The duplicate description of is omitted.

  In the second embodiment, the circulation pump 12 (58) is constituted by a pump capable of controlling the internal pressure of the circulation path by the rotation speed control. In order to accurately perform the rotation speed control, the circulation pump 12 ( 58) is constituted by a DC pump (direct current pump). In this embodiment, the internal pressure of the circulation path of the bath water and the internal pressure of the heating hot water circulation path are both controlled by the rotational speed control of the circulation pump 12 (58). The internal pressure control of the bath water circulation path will be described as a representative.

  As shown in FIG. 2A, the internal pressure of the bath water circulation path (pressure in the pipe line) is detected by providing a pressure detection sensor in the circulation path. Since the water level sensor 10 for detecting the water level as the bathtub water level information is provided, the water level sensor 10 is also used as a pressure detection sensor. In addition, the detection of the water pressure of the heating hot water circulation path is performed by providing a separate pressure detection sensor. Further, the rotational speed of the circulation pump 12 is detected by a rotational speed detection sensor 76.

The rotation speed control means is provided in a control device (not shown) for controlling the functional component, and for example, control data such as shown in FIG. In addition, it includes components such as an arithmetic circuit that calculates the rotational speed of the circulation pump 12 using the control data, and a memory that stores the arithmetic value. The speed control unit value of the set pressure P ₁ of the internal pressure of the circulation pump 12 is provided in advance in the memory. This set pressure P ₁ is a pressure lower than the pressure in the hot water tank 2 (pressure with a margin to prevent the fluid in the circulation path from leaking into the hot water tank 2 even if fine cracks or the like occur in the circulation path). The value is determined by, for example.

  The rotational speed control means takes in the detected pressure in the circulation path from the pressure detection sensor 10 and the detected value of the pump rotational speed from the rotational speed detection sensor 76, and when the detected pressure deviates from the set pressure, the detected pressure is The number of revolutions is controlled by varying the applied voltage of the circulation pump 12 so that the set pressure is reached.

  According to the second embodiment, the pressure of the circulation path of the bathtub water and the circulation path of the heating / warming water are controlled by the rotation speed control of the circulation pumps 12 and 58 so as to maintain the set pressure. Since the pressure does not exceed the pressure of the hot water in the hot water tank 2 in the volume expanding section 55, even if a damage abnormality such as a microcrack or a pinhole occurs in the circulation path in the volume expanding section 55, the circulation path The fluid that passes through the hot water of the hot water supply of the volume expanding portion 55 is not mixed, and contamination of the hot water of the hot water (hot water of the hot water storage tank 2) can be surely prevented, thereby improving hygiene reliability. Can do.

  In the second embodiment, the set pressure of the bath water circulation path and the set pressure of the heating hot water circulation path are set to the same pressure. Different set pressures may be used. In the second embodiment, the pressure breaking means (blow valve) may not be provided in the circulation path. However, when the pressure breaking means (blow valve) is provided, the pressure breaking means (blow valve) is provided. It is possible to achieve a double safety: safety by pressure destruction due to pressure (safety that can prevent the fluid (running water) in the circulation path from entering the hot water in the hot water tank 2) and safety by controlling the rotation speed of the circulation pump. .

  Next, a third embodiment of the heat exchange device according to the present invention will be described. This third embodiment includes the same bath water and heating hot water circulation path and heat exchanger (bath heat exchanger 49, heating heat exchanger 56) as those of the first and second embodiments. In addition, a pressure detection sensor that detects the pressure in the circulation path is provided in the circulation path of the bathtub water and the circulation path of the heating hot water. When the detected pressure of this sensor reaches the set pressure (pump stop reference pressure) The circulation pump of the circulation path to be stopped is stopped, and the water (hot water) of the circulation path is mixed into the hot water in the volume expanding section 55 and the hot water in the hot water storage tank 2 is contaminated in the same manner as in the above embodiments. It has the structure which prevents that. Also in the third embodiment, the set pressure is set at a pressure value lower than the pressure in the hot water tank 2 as in the above embodiments.

  In the third embodiment, since the circulation pump is stopped when the internal pressure of the circulation path reaches the set pressure to prevent contamination of the hot water in the hot water tank 2, the circulation provided in the circulation path. The pumps 12 and 58 may or may not be pumps capable of accurately controlling the rotational speed, and the type of pump may be either AC or DC.

  In the third embodiment, the safety (safety for preventing contamination from the circulation path to the hot water in the hot water tank 2) by the pressure breaking means (blow valve) according to the first embodiment, and the second Although it is not necessary to provide the safety configuration by the pump rotation control of the embodiment example, one or both of the safety configuration of the first embodiment example and the safety configuration of the second embodiment example are used together (added) ), It is possible to achieve double or triple safety.

  The present invention is not limited to the above-described embodiments, and various embodiments can be adopted. For example, in each of the above embodiments, the hot water in the hot water tank 2 is introduced into the volume expansion unit 55 (55a, 55b), and the hot water in the volume expansion unit 55 is used as a heat source for the heat exchangers 49, 56. However, as shown in FIG. 4, a part of the circulation path (spiral pipe 16) is passed through (inserted) into the hot water tank 2 to form a pipe. It is good also as a structure which heat-exchange-heats the circulating water which directly passes the spiral pipe | tube 16 with hot water. In this case, the hot water tank 2 functions (combines) as a heat source container (volume expanding portion 55) of the heat exchanger.

  Even when a part of the spiral pipe 16 of the circulation path is placed in the hot water tank 2 as described above, if a pressure breaking means (blow valve) is provided in the circulation path outside the hot water tank 2, The safety structure is the same as that of the first embodiment (safety structure for preventing contamination water from entering the hot water tank 2 from the circulation path), and the circulation pump in the circulation path is a pump capable of controlling the rotation speed. If the control is performed so that the pressure of the gas does not exceed the set pressure, the same configuration as in the second embodiment prevents the contaminated water from being mixed. Further, when the detected pressure in the circulation path reaches the set pressure, If it is set as the structure which stops a circulation pump, it will become the safe structure of prevention of contamination water mixing similar to the said 3rd Embodiment.

  In each of the above embodiments, the heat exchange device is shown incorporated in a hot water supply / hot water filling system. However, the heat exchange device of the present invention is a single heat exchange for heating heating water or bath water. It may be used as a device.

  Further, in each of the above-described embodiments, the explanation has been made on the circulation heating of bath water and the circulation heating of heating hot water, but the heat exchange device of the present invention can be applied to the circulation heating of other heated fluids. It is.

  Further, in each of the above embodiments, when the pressure in the circulation path is detected by a pressure sensor and the detected pressure reaches a set pressure (pressure destruction reference pressure) lower than the internal pressure of the hot water tank, or the destruction reference When the set pressure for generating an alarm lower than the pressure is reached, or the number of rotations detected by a rotation speed detection sensor provided for detecting the number of rotations of the circulation pump has decreased to a preset number of rotations for generating an alarm. In some cases, for example, a configuration for issuing an alarm (notifying) by an alarm means such as a buzzer, a lamp, or a monitor screen display may be added.

It is explanatory drawing which shows the structure of 1st Embodiment of the heat exchange apparatus which concerns on this invention in the state of incorporating in the hot-water supply and hot-water filling system. It is explanatory drawing of a structure of the 2nd Example of this invention. It is a figure which shows an example of the heat exchanger which comprises the heat exchange apparatus of the example of an embodiment. It is explanatory drawing of the hot water supply and hot water filling system equipped with the heat exchange apparatus which the applicant designed previously.

Explanation of symbols

2 Hot water storage tank 3 Bathtub 49 Bath heat exchanger 55 (55a, 55b) Volume expansion part (heat source container)
56 Heating heat exchanger 66, 70 Blow valve (pressure breaking means)
71 Combined heat exchanger

Claims (7)

  Heated fluid that has a hot water storage tank for storing hot water, and that passes through the circulation path through which the heated fluid circulates in a heat source container that communicates with the hot water storage tank and is filled with hot water in the hot water storage tank Is configured to be heated by exchanging heat with hot water in the heat source container, and in the circulation path, a pressure destruction means is provided in a path outside the heat source container, and the pressure destruction means is a pressure in the circulation path. A heat exchange device characterized in that when the pressure exceeds a set pressure lower than the pressure in the hot water tank, the pressure is destroyed and the pressure in the circulation path is maintained below the set pressure.   The pressure breaking means is a blow valve, which blows the fluid to be heated when the pressure in the circulation path exceeds a set pressure lower than the pressure in the hot water storage tank, thereby setting the pressure in the circulation path to the set pressure. The heat exchange device according to claim 1, wherein the heat exchange device is configured to be maintained below.   Heated fluid that has a hot water storage tank for storing hot water, and that passes through the circulation path through which the heated fluid circulates in a heat source container that communicates with the hot water storage tank and is filled with hot water in the hot water storage tank Is configured to be heated by exchanging heat with hot water in the heat source container, and the circulation path is provided with a circulation pump that circulates and drives the fluid to be heated and a pressure detection sensor that detects the pressure in the circulation path, The circulation pump is a pump capable of changing the pressure in the circulation path by controlling the number of revolutions, and the number of revolutions is controlled by the number of revolutions control means. The number of revolutions control means uses the pressure detection information of the pressure detection sensor. A heat exchange device, characterized in that the rotational speed of the circulation pump is controlled so that the detected intake pressure is maintained at a set pressure lower than the pressure in the hot water tank.   4. The heat exchange device according to claim 3, wherein the circulation pump is a DC pump.   Heated fluid that has a hot water storage tank for storing hot water, and that passes through the circulation path through which the heated fluid circulates in a heat source container that communicates with the hot water storage tank and is filled with hot water in the hot water storage tank Is configured to be heated by exchanging heat with hot water in the heat source container, and the circulation path is provided with a circulation pump that circulates and drives the fluid to be heated and a pressure detection sensor that detects the pressure in the circulation path. And a control means for stopping the circulation pump when the detected pressure of the pressure detection sensor exceeds a set pressure lower than the pressure in the hot water storage tank.   The heat exchanger according to any one of claims 1 to 5, wherein the circulation path is a pipe that circulates the bathtub water, and the heat source container constitutes a bath heat exchanger that heats and heats the bathtub water passing through the circulation path. .   The heat exchanger according to any one of claims 1 to 6, wherein a part of the circulation path is formed by piping through a hot water tank, and the hot water tank also serves as a heat source container.

Images