JP2005315553A - Heat exchanger unit for hot water storage type supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger unit for hot water as storage type supply device, utilizing heated heat medium for other applications than hot water supply while reducing manufacturing cost and saving space by constructing a heat exchanger to distribute heated hot supply water in a hot water storage tank to a heating source for heating a plurality of heated objects. <P>SOLUTION: The heat exchanger 30 has primary tubes 31 in which hot supply water flows from the hot water storage tank 10, and a reheating heat exchanger 32 and a heating heat exchanger 33 in which the heat medium flows, wound in almost the same coiled shape, the primary tubes 31, the reheating heat exchanger 32 and the heating heat exchanger 33 being arranged alternately. Thus, the heated heat medium can be utilized for other applications than hot water supply, while reducing manufacturing cost and saving space. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger unit of a hot water storage hot water supply apparatus including a heat exchanger that heats a hot water stored in a hot water storage tank to a primary side and heats a heat medium flowing to a secondary side. The present invention relates to a configuration of a heat exchanger in which a plurality of secondary sides heated by using water as a heating source are arranged.

  Conventionally, what is shown, for example in patent document 1 is known as a heat exchanger unit of this kind of hot water storage type hot water supply apparatus. In this patent document 1, it is a heat exchanger which heats a heat medium with the heat of condensation when condensing a refrigerant, and a high-temperature and high-pressure refrigerant compressed by a compressor provided in a heat source unit is circulated to the primary side. In the same manner as this, a hot water supply heat exchanger having a coil shape that heats hot water in a hot water storage tank that circulates to the secondary side, and a high-temperature and high-pressure refrigerant compressed by a compressor is circulated to the primary side to form a secondary A heat exchanger unit that has a coil shape that heats the bath water in the bathtub that circulates to the side, and that constitutes a heat exchanger unit that is located just above the heat exchanger for hot water supply doing.

This heat exchanger unit is installed separately from the heat source unit, which is a heating device including a heat pump cycle, and the hot water storage tank and accommodated in the hot water supply unit. Thereby, the installation space of the hot water supply unit is effectively used by combining the heat exchanger for reheating and the heat exchanger for hot water supply in the vertical direction, and space saving of the hot water supply unit is achieved (for example, Patent Documents). 1).
JP 2002-22268 A

  However, according to Patent Document 1, a configuration in which the heat exchanger unit and the heat source unit are separated by using a refrigerant as a heating source that is a primary side of the hot water supply heat exchanger and the reheating heat exchanger. As a result, a refrigerant connection pipe filled with the refrigerant is required, and construction work for connecting the heat exchanger unit and the heat source unit is required when the hot water supply device is installed. As a result, there are problems such as a large number of parts, construction work costs, and parts costs.

  In addition, the primary side tubes of these heat exchangers require a high-strength refrigerant and, for example, require tube strength such as increasing the plate thickness, which increases the manufacturing cost of the heat exchanger and increases the product weight. There is a problem that increases.

  In addition, there is a method of reducing the installation space by forming a reheating heat exchanger in a coil shape in a hot water storage tank, for example. There is a problem that it is difficult to obtain a sufficient heating amount for the secondary side heat medium due to the temperature distribution of the hot water supply water.

  Accordingly, an object of the present invention is to take the above-mentioned points into consideration, and by heating the hot water supply water in the hot water storage tank to the heating source to constitute a heat exchanger that heats a plurality of heating destinations, the heating is performed. An object of the present invention is to provide a heat exchanger unit of a hot water storage type hot water supply apparatus that makes it possible to use the used heat medium for other purposes of hot water supply and to reduce manufacturing costs and save space.

  In order to achieve the above object, the technical means described in claims 1 to 8 are employed. That is, according to the first aspect of the present invention, the hot water storage tank (10) for storing hot water supply water heated by the heating device (20) and the hot water supply water in the hot water storage tank (10) are circulated to the primary side. A heat exchanger unit of a hot water storage hot water supply apparatus comprising a heat exchanger (30) for exchanging heat with a heat medium circulating on the secondary side, wherein the heat exchanger (30) has one circuit on the primary side which is the heating side The secondary side to be formed and heated is composed of at least two circuits or more than two circuits.

  According to the first aspect of the present invention, it is possible to use a heating medium heated to two or more heating destinations using the stored hot water supply water as a heating source. Further, since the stored hot water supply water is used as a heating source, the manufacturing cost and the product weight can be reduced as compared with the conventional case using a refrigerant.

  In the invention according to claim 2, the heat exchanger (30) includes a primary side tube (31) through which hot water supply water in the hot water storage tank (10) flows, and a secondary side tube (32, 33) through which a heat medium flows. Are wound in substantially the same coil shape, and the primary side tubes (31) and the secondary side tubes (32, 33) are alternately arranged. Specifically, according to the second aspect of the invention, these tubes (31, 32, 33) can be integrated so that the installation space can be saved.

  In the invention according to claim 3, the secondary side tubes (32, 33) are arranged in order of one circuit and two circuits from the upper side to the lower side with respect to the longitudinal direction of the primary side tube (31). It is characterized by that. According to the invention described in claim 3, more specifically, since a plurality of secondary side tubes (32, 33) can be arranged in the vertical direction, the installation area does not have to be greatly expanded. Thereby, the space saving of the heat exchanger unit can be achieved.

  In the invention according to claim 4, the heat exchanger (30) is characterized in that the primary side tube (31) and the secondary side tube (32, 33) are joined by brazing. According to the invention described in claim 4, the joining process is the most reliable and the manufacturing cost is low. Moreover, the heat exchange efficiency of a primary side tube (31) and a secondary side tube (32, 33) is also good.

  In the invention according to claim 5, the secondary tube (32, 33) is a bathing water repelling device that retreats the bathing water so that one of them circulates the bathing water in the bathtub as a heat medium ( 80), and the other is connected to a heating device (60, 70) that exchanges heat between the heated heat medium and either the heated fluid or the heated object.

  According to the invention described in claim 5, the hot water supply water stored in the hot water storage tank (10) is suitable for use in the bath water reheating device (80) for heating the bath water, and further, It is also suitable for a heating device (60, 70), for example, a heating device such as a floor heater or a bathroom dryer in a place where hot water is required such as a bathroom, a kitchen, and a bathroom.

  In the invention according to claim 6, the secondary side tube (33) connected to the heating device (60, 70) is more secondary than the secondary side tube (32) connected to the bath water repelling device (80). Is also characterized by a large number of coil turns. According to invention of Claim 6, a secondary side tube (32, 33) can be formed according to the heat load of a use. Here, it is possible to easily increase the heat transfer area on the heating device (60, 70) side than the bath water reheating device (80).

  In the invention according to claim 7, the secondary side tube (32) connected to the bath water repelling device (80) is more than the secondary side tube (33) connected to the heating device (60, 70). It is characterized in that it is configured to exchange heat with the primary tube (31) first. According to the seventh aspect of the present invention, the hot water supply water stored in the hot water storage tank (10) in preference to the heating device (60, 70) can be used as a heating source so that the bath water can be replenished. Can be sure.

  In the invention according to claim 8, the primary side tube (31) is a joint portion with the secondary side tube (32, 33) in the vicinity of the upper end and the lower end that becomes the winding start and end of the coil shape provided with the connection port. Is unbonded. According to the invention described in claim 8, the heat exchanger (30) can be integrated with the hot water storage tank (10).

  In other words, when transported in a state where both ends of the primary side tube (31) are joined to the hot water storage tank (10), the vibration is absorbed at the unjoined portion with respect to the transportation vibration, so that the primary side tube The stress applied to (31) is relieved and the primary tube (31) can be prevented from being damaged.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.

(First embodiment)
Hereinafter, a heat exchanger unit of a hot water storage type hot water supply apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a schematic view showing the overall configuration of a hot water storage type hot water supply apparatus to which the present invention is applied. A heat exchanger that heats a heat medium that circulates to the secondary side using the supplied hot water supply as a heat source is used for a bath water replenishment function and a heating function.

  First, as shown in FIG. 1, the hot water supply function includes a hot water storage tank 10 that stores hot water supply water therein, and fluid heating that sends the lowest (low temperature) hot water supply water in the hot water storage tank 10 to the uppermost portion in the hot water storage tank 10. A flow path 21, a heat pump unit 20 that is a heating device that heats hot-water supply water flowing through the fluid-heating flow path 21, a water supply pipe 12 that guides tap water into the hot water storage tank 10, and a hot water storage tank 10 It is comprised from the derivation | leading-out pipe | tube 13 which derives | leads-out the hot water supply water, the hot water supply piping 14, 14a, and the control apparatus (The hot water supply control part 41, the heat source control part 42) which controls the action | operation of this hot water supply system.

  On the other hand, in the reheating function and the heating function, from the primary side tube 31 through which the hot water supply water in the hot water storage tank 10 circulates to the primary side and the secondary side tubes 32 and 33 of the two circuits through which the heat medium circulates to the secondary side. A heat exchanger 30, a bath water reheating device 80, a floor heating unit 60 and a heating unit 70 that are heating devices, connection pipes 34, 35, 36, and 37 that connect them, and a control device (a hot water supply control unit) 41). In the present embodiment, one of the secondary circuits 32 and 33 of the two circuits is referred to as a reheating heat exchanger 32 and the other is referred to as a heating heat exchanger 33.

  Next, the components constituting the hot water supply function will be described more specifically. The hot water storage tank 10 is formed of a vertically long metal-made container (for example, made of stainless steel) having excellent corrosion resistance, and heat insulation (not shown) on the outer peripheral portion. The material is arranged so that the hot water supply water can be kept warm for a long time. An inlet 10a is provided on the bottom surface of the hot water storage tank 10, and a water supply pipe 12 serving as a water supply path is connected to the inlet 10a.

  And the feed water thermistor 51 which detects feed water temperature is provided in the feed water piping 12, and the temperature information in the feed water piping 12 is output to the hot water supply control part 41 mentioned later. In addition, the water supply pipe 12 is provided with a pressure reducing check valve (not shown) that adjusts the water pressure of the tap water introduced into the introduction port 10a to a predetermined pressure and prevents the backflow of hot water in the case of water interruption. Yes. Further, the downstream end of the water supply pipe 12 is connected to one inlet side of the hot water mixing valve 15 and the hot water mixing valve 15a.

  In addition, a lead-out port 10b is provided at the uppermost part of the hot water storage tank 10, and the lead-out port 10b is a lead-out route that is a hot water supply path for leading out hot water supply water out of hot water stored in the hot water storage tank 10. A tube 13 is connected. A discharge pipe 13a provided with an air relief valve 19 is connected in the middle of the route of the outlet pipe 13, and when the pressure in the hot water storage tank 10 rises above a predetermined pressure, The hot water supply water is discharged to the outside so as not to damage the hot water storage tank 10 and the like.

  A hot water supply mixing valve 15 and a hot water filling mixing valve 15a are provided at the downstream end of the outlet pipe 13, and hot water supply pipes 14 and 14a, which are mixed hot water paths, are connected to the downstream side thereof. Further, the hot water supply pipes 14 and 14a are provided with hot water thermistors 52 and 52a for detecting the hot water temperature of the hot water supply water and flow rate counters for detecting the flow rate information of the hot water for the hot water supply pipes 14 and 14a. 57 and 57a are provided, and temperature information and flow rate information detected by the hot water thermistors 52 and 52a and the flow rate counters 57 and 57a are output to the hot water supply control unit 41 described later.

  In addition, the downstream ends of the hot water supply pipes 14 and 14a lead to hot water taps and shower taps (not shown) arranged in the kitchen, bathroom, bathroom, etc., and the hot water taps and shower taps are opened. Sometimes, hot water supply water adjusted to the set temperature set by the user is discharged. When the flow rate counters 57 and 57a detect the flow of hot water in the hot water supply pipes 14 and 14a, this means that hot water is being used in either a hot water tap or a shower tap. One of the hot water supply pipes 14a is a hot water supply pipe for filling bath water in the bathtub, and is provided with a hot water filling on-off valve 58, a flow rate counter 57a, and a check valve 59.

  The hot water on / off valve 58 is an electromagnetic valve that is controlled by a hot water supply control unit 41, which will be described later, and opens and closes the mixed hot water flowing through the hot water supply pipe 14a. The flow rate counter 57a detects the hot water filling flow rate flowing in the hot water supply pipe 14a. The check valve 59 is a valve for preventing the bath water in the bath water replenishing device 80 from flowing into the hot water supply pipe 14a.

  When the hot water filling on / off valve 58 is opened to fill the bathtub with hot water, hot water, or hot water, the on / off valve 85, which will be described later, is also controlled to open and detected by the water pressure switch 84. When the water level that has been reached reaches a predetermined level, the hot water filling on-off valve 58 and the on-off valve 85 are closed, and hot water of a set flow rate is filled in the bathtub. The hot water and the hot water are controlled so that the mixed hot water of a predetermined flow rate is discharged based on the flow rate information detected by the hot water filling flow rate counter 57a.

  By the way, the hot water mixing valve 15 and the hot water mixing valve 15a are temperature control valves for adjusting the hot water temperature of the hot water to be led to the hot water pipes 14 and 14a, and are provided on the outlet pipe 13 side and the hot water pipe 12 side. By adjusting the opening area ratio, the mixing ratio of hot water supply water and tap water is adjusted. That is, the temperature is adjusted so that the set temperature is set by the user.

  The mixing valves 15 and 15a are electrically connected to a hot water supply control unit 41 described later, and are based on temperature information detected by the hot water thermistors 52 and 52a, the water supply thermistor 51, and a hot water storage thermistor 54 described later. Controlled. The mixing valves 15 and 15a are controlled to perform feedback control based on temperature information detected by the hot water thermistors 52 and 52a.

  On the outer wall surface of the hot water storage tank 10, a plurality of (5 in this example) hot water storage thermistors 54, which are water temperature sensors for detecting the hot water storage amount or the hot water storage temperature, are arranged in the vertical direction (the height of the tank). The temperature information at each water level in the hot water storage tank 10 is arranged at approximately equal intervals in the direction) and is output to the hot water supply control unit 41 described later.

  Accordingly, the hot water supply control unit 41, based on the temperature information from the plurality of hot water storage thermistors 54, the hot water heated up in the hot water storage tank 10 and the low temperature hot water before boiling in the hot water storage tank 10. And the hot water temperature of hot water supply at each water level can be detected. Of the plurality of hot water storage thermistors 54, the hot water storage thermistor 54 provided at the uppermost part has a function of detecting the temperature of the hot water used for hot water supply.

  Next, the heat pump unit 20 that heats the hot water supply water in the hot water storage tank 10 uses a supercritical heat pump cycle in which, for example, carbon dioxide gas is used as a refrigerant, so that the refrigerant pressure on the high pressure side becomes equal to or higher than the critical pressure of the refrigerant. ing. As is well known, this heat pump cycle includes refrigeration cycle functional parts such as a compressor, a heat storage heat exchanger, an expansion valve, an evaporator, and an accumulator (not shown). Incidentally, the compressor (not shown) is driven by a built-in electric motor (not shown), compresses the gaseous refrigerant sucked from the accumulator to a critical pressure or more, and discharges it.

  A heating heat exchanger (not shown) exchanges heat between refrigerant and hot water supply water. For example, a refrigerant passage (not shown) through which refrigerant flows and a heating fluid passage (not shown) through which hot water flows flow. This is a counterflow heating heat exchanger (not shown) provided in the heavy pipe structure and configured so that the flow direction of the refrigerant and the flow direction of the hot water supply water face each other. The expansion valve (not shown) depressurizes the refrigerant flowing out from the heating heat exchanger and supplies it to the evaporator (not shown). The evaporator (not shown) evaporates the refrigerant decompressed by the expansion valve (not shown) by heat exchange with the atmosphere. An accumulator (not shown) gas-liquid separates the refrigerant flowing out of the evaporator, sucks only the gas-phase refrigerant into the compressor, and stores excess refrigerant in the cycle.

  Further, a heating fluid passage (not shown) of the heating heat exchanger is connected to the hot water storage tank 10 via the fluid heating flow path 21 described above, and an electric pump (not shown) is operated, whereby the hot water storage tank 10 Water for hot water supply circulates. The upstream end of the fluid heating channel 21 is connected to the bottom 10 c of the hot water storage tank 10, and the downstream end of the fluid heating channel 21 is connected to the upper part 10 d of the hot water storage tank 10. Thereby, the hot water supply water heated by the heat exchange with the refrigerant in the heating heat exchanger (not shown) is sent to the upper part 10d of the hot water storage tank 10, so that the hot water storage tank 10 is sequentially moved from the upper side to the lower side. Heat is stored in hot water.

  The heat pump unit 20 is operated by a control signal from a heat source control unit 42 to be described later, and outputs an operating state to the heat source control unit 42. In addition, the AC power is used as the power source, and the heat storage operation of boiling the hot water in the hot water storage tank 10 is performed mainly using the midnight power in the midnight time zone where the price setting is the cheapest. Also in the above, when the hot water temperature of the hot water is lowered, the boiling operation is controlled. Incidentally, according to the supercritical heat pump cycle, hot water supply water having a temperature higher than that of a general heat pump cycle (for example, 85 to 90 ° C.) can be stored therein.

  Next, the component parts that constitute the tracking function will be described more specifically. The bath water replenishing device 80 is a device that recirculates the bath water in the bathtub to the reheating heat exchanger 32 that is the secondary side tube of the heat exchanger 30 and repels the bath water, The circulation circuit composed of the return pipe 81 and the bypass pipe 83 is connected to connection pipes 34 and 35 that connect the reheating heat exchanger 32 of the heat exchanger 30.

  Incidentally, the forward pipe 82 side is connected to the connection pipe 34, and the return pipe 81 side is connected to the connection pipe 35. Further, the forward pipe 82 is provided with a water pressure switch 84, an on-off valve 85, a second circulation pump 86, a bath water temperature thermistor 55, a running water switch 87, and a reheating three-way valve 88 in this order from the upstream side. Further, the return pipe 81 is provided with a recirculating thermistor 56 on the downstream side.

  The water pressure switch 84 is a sensor that detects the amount of hot water in the bathtub filled with hot water, in other words, the water pressure for obtaining the water level in the bathtub. The on-off valve 85 is an electromagnetic valve that opens and closes the bath water circulation circuit, and the second circulation pump 86 is an electric pump that pumps the bath water in the bathtub to the reheating heat exchanger 32. The bath water temperature thermistor 55 is a water temperature sensor that detects the hot water temperature of the bath water flowing through the forward pipe 82.

  The flowing water switch 87 is a flowing water sensor for detecting whether bath water and hot water supply water described later are flowing in the direction of the reheating three-way valve 88. The reheating three-way valve 88 is a switching valve for switching the flow direction to either one of the bypass pipe 83 that causes the bath water to flow to the reheating heat exchanger 32 or to bypass the reheating heat exchanger 32. is there. The reheating thermistor 56 is a water temperature sensor that detects the hot water temperature of the bath water flowing through the return pipe 81, and is the bath water temperature returned to the bathtub.

  The water pressure switch 84, the flowing water switch 87, the bath water temperature thermistor 55, and the reheating thermistor 56 are configured to output volume information, flowing water information, and temperature information to the hot water supply control unit 41 described later. The two-circulation pump 86 and the reheating three-way valve 88 are controlled by a hot water supply control unit 41 described later. When the temperature of the bath water in the bathtub is detected after filling with hot water, the flow direction of the reflow three-way valve 88 is switched to the bypass pipe 83 side, and the second circulation pump 86 is operated, so that the bath in the bathtub is operated. Water is circulated in the order of the forward pipe 82, the bypass pipe 83, the return pipe 81, and the bathtub, and the bath water temperature thermistor 55 detects the hot water temperature of the bath water.

  Further, when reheating, the flow direction of the recirculating three-way valve 88 is switched to the reheating heat exchanger 32 side, so that the bath water in the bathtub is transferred to the forward pipe 82, the reheating heat exchanger 32, and the return pipe. 81. The bath water is circulated in this order, and is controlled to circulate until the bath water temperature detected by the bath water temperature thermistor 55 reaches a predetermined temperature. The heat exchanger 30 and the reheating heat exchanger 32 will be described later.

  Next, the component parts which comprise a heating function are demonstrated more concretely. First, the floor heating unit 60 is, for example, a heating device that is installed on a floor such as a washroom or a kitchen, circulates a heat medium through a pipe 61a in the floor panel 61, and warms the floor panel 61 that is an object to be heated. A thermal valve 62 that opens and closes the heat medium flowing through the pipe 61a, a water temperature sensor (not shown) that detects the outlet side water temperature of the floor panel 61, and a thermal valve 62 that is based on the outlet side water temperature detected by the water temperature sensor. It is comprised from the floor warming control part (not shown) which controls. In the present embodiment, only one floor heating unit 60 is installed, but two or more of them may be provided in parallel to the heating heat exchanger 33.

  The heating unit 70 is, for example, a heating device that sucks in indoor air that is a fluid to be heated in a bathroom or a washroom, heats the air by a radiator 71, and blows out hot air to heat the room. 71, an air blower 72, an on-off valve 73 for opening and closing a secondary fluid flowing through the radiator 71, an intake temperature sensor (not shown) for detecting an intake temperature, and an intake air temperature based on the intake temperature detected by the intake temperature sensor 72 and a heating control unit (not shown) for controlling the on-off valve 73. In the present embodiment, only one heating unit 70 is installed, but two or more plural units may be provided in parallel to the heating heat exchanger 33.

  The connection pipes 36 and 37 are circulation circuits that circulate the heat medium heat-exchanged by the heating heat exchanger 33 to the floor heating unit 60 and the heating unit 70. The connection pipe 36 is a forward pipe, and the connection pipe 37 is It is a return pipe. The connection pipes 36 and 37 are provided with a bypass passage 36a, a third circulation pump 38, a thermistor 53 after heat exchange, and the like. The bypass passage 36a is a bypass circuit that bypasses the floor heating unit 60 and the heating unit 70 when all of the thermal valve 62 and the on-off valve 73 are closed.

  The third circulation pump 39 is a pressure feeding unit that circulates the heat medium from the heating heat exchanger 33 to the floor heating unit 60 and the heating unit 70, and will be described later based on the number of floor heating units 60 and the number of heating units 70 used. The number of rotations is controlled by the hot water supply control unit 41. The post-heat exchange thermistor 53 is a water temperature sensor that detects the water temperature of the heat medium after heat exchange that has passed through the heat exchanger 33 for heating, and temperature information detected by the post-heat exchange thermistor 53 is described later. The data is output to the unit 41.

  Here, the heat exchanger 30, which is a main part of the present invention, will be described with reference to FIGS. The heat exchanger 30 of the present embodiment is a counter flow type heat exchanger in which a primary side that is a heating side is formed by one circuit and a secondary side that is a heated side is configured by two circuits or two or more circuits. . Specifically, as shown in FIG. 3, a primary side tube through which hot water stored in the hot water storage tank 10 circulates and a plurality (two in this embodiment) secondary side tubes 32 through which the heat medium circulates. , 33.

  Here, 31a shown in the drawing is an inflow portion of the primary side tube 31, 31b is an outflow portion of the primary side tube 31, 32a is an inflow portion of the secondary side tube 32, and 32b is an inflow portion of the secondary side tube 32. The outflow part, 33a is the inflow part of the secondary side tube 33, and 33b is the outflow part of the secondary side tube 33.

  As shown in FIG. 4, these tubes 31, 32, and 33 are made of tubes having a substantially oval cross section (for example, an outer diameter of about 12 mm), and substantially the same coil shape (for example, having an inner diameter of about 12 mm). 2), a secondary tube 32 and another secondary side from the upper side to the lower side of the primary side tube 31 as shown in FIG. 2 (b). The tubes are arranged in the order of the tubes 33, and the secondary tubes 32 and 33 and the primary tubes 31 are alternately arranged.

  In other words, one secondary side tube 32 is configured above the primary side tube 31, and another secondary side tube 33 is configured below. Furthermore, as shown in FIG. 4, it joins to the junction part 31c by which the primary side tube 31 and the secondary side tubes 32 and 33 are arrange | positioned alternately by brazing joining. In addition, brazing joining of the joining surface 31c forms an unjoined portion 31d that will be described later but not brazed and joined at the ends of the tubes 31, 32, and 33, that is, near the beginning and end of winding of the coil shape. Yes.

  By the way, in the hot water storage type hot water supply apparatus of the present embodiment, as described above, the secondary tube 32 disposed above is connected to the bath water reheating apparatus 80 as the reheating heat exchanger 32 and disposed below. The secondary side tube 33 thus obtained is called a heating heat exchanger 33 and connected to the heating devices 60 and 70. Accordingly, the number of turns in the coil shape is increased in the heating heat exchanger 33 disposed below to increase the heat transfer area with the primary side tube 31 compared to the reheating heat exchanger 32 disposed above. It is.

  As shown in FIG. 1, the heat exchanger 30 having the above configuration has a primary side circulation circuit as a forward pipe 16 and a return pipe 17 so that hot water stored in the hot water storage tank 10 flows through the primary side tube 31. And the first circulation pump 18 and the like. The forward pipe 16 has an upstream end connected to the upper part 10 e of the hot water storage tank 10 and a downstream end connected to the inflow part 31 a of the primary side tube 31.

  The return pipe 17 has an upstream end connected to the outflow part 31 b of the primary tube 31 and a downstream end connected to the lower part 10 f of the second hot water storage tank 10. The first circulation pump 18 is disposed in the middle of the return pipe 17 and is a pump that distributes the hot water supply water in the hot water storage tank 10 to the primary side tube 31. The first circulation pump 18 is electrically connected to a hot water supply control unit 41, which will be described later, so that the rotational speed is controlled based on the temperature information detected by the reheating thermistor 56 and the post-heat exchange thermistor 53 described above. Has been.

  On the other hand, the reheating heat exchanger 32 has an inflow portion 32 a connected to the connection pipe 35, an outflow portion 32 b connected to the connection pipe 34, and bath water in a direction opposite to the flow direction of the primary side tube 31. Will flow. Similarly, in the heat exchanger 33 for heating, the inflow part 33a and the outflow part 33b are connected to the connection pipes 36 and 37, and the heat medium flows in a direction opposite to the flow direction of the primary side tube 31. Become. Thereby, the heat exchanger 30 forms a counterflow type heat exchanger as shown by an arrow in FIG.

  Next, the hot water supply control unit 41 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, and temperature information from the thermistors 51 to 56, Based on flow rate information from the flow rate counters 57 and 57a, an operation signal from an operation switch provided on an operation panel (not shown), etc., the lead-out pipe 13, the hot water supply pipes 14 and 14a, the bath water reheating device 80, and the connection pipe 36 and 37 and various actuators in the return pipe 17 are controlled.

  Similarly to the hot water supply control unit 41, the heat source control unit 42 is mainly composed of a microcomputer, and a built-in ROM (not shown) is provided with a preset control program, not shown. The actuators in the heat pump unit 20 are controlled based on temperature information from various thermistors. In this heat source control unit 42, a hot water storage thermistor (topmost part) 54 that detects the temperature of hot water after heating is maintained in order to keep the hot water temperature heated by a heating heat exchanger (not shown) at a constant temperature. The rotational speed of an electric pump (not shown) is controlled based on the detected temperature.

  Next, the operation of the heat exchange unit of the hot water storage type hot water supply apparatus having the above configuration will be described. First, when a power switch (not shown) is turned on, for example, when a midnight time zone is reached, the heat source control unit 42 causes the heat pump cycle parts (not shown) in the heat pump unit 20 and actuators such as an electric pump (not shown) to be connected. The hot water supply water in the hot water storage tank 10 is controlled to be heated, and hot water supply water (for example, 85 ° C.) is stored.

  The hot water stored in the hot water storage tank 10 is used for hot water supply to a kitchen, a washroom, a bathroom, etc., and the high temperature hot water stored in the primary tube 31 of the heat exchanger 30 is circulated. Thus, the bath water flowing through the reheating heat exchanger 32 and the heat medium flowing through the heating heat exchanger 33 are heated and used for the reheating function and the heating function.

  First, the operation for chasing the bath water will be described. When the reheating switch (not shown) is operated, the bath water temperature is detected every predetermined time, and if the bath water temperature does not reach the reheating set temperature, the bath water is heated. To do. That is, the hot water supply control unit 41 activates the follow-up three-way valve 88, the on-off valve 85, and the second circulation pump 86 after a predetermined time to circulate the bath water in the bathtub in the order of the forward pipe 82, the bypass pipe 83, and the return pipe 81. Let

  At this time, the bath water temperature is detected by the bath water temperature thermistor 55. When the detected bath water temperature is equal to or lower than the reheating set temperature, the flow direction of the reheating three-way valve 88 is switched to the reheating heat exchanger 32 side, and the bath water is circulated to the reheating heat exchanger 32. Thereby, the 1st circulation pump 18 is drive | operated, hot water supply water is distribute | circulated to the primary side tube 31, and bath water receives the hot water hydrothermal energy, and is heated. The hot water supply water that has been heat-exchanged with the bath water is returned to the hot water storage tank 10.

  When the bath water temperature reaches the set temperature, the flow direction of the reheating three-way valve 88 is switched to the bypass pipe 83 side, the on-off valve 85 is closed, and the second circulation pump 86 and the first pump 18 are stopped. As a result, the hot water in the hot water storage tank 10 is used as a heating source, and the bath water is reheated and maintained at a set temperature.

  Next, the operation of the heating device when the floor heating unit 60 and the heating unit 70 are operated will be described. When the operation switch (not shown) is operated in the floor warming unit 60, the thermal valve 62 is opened, and the third circulation pump 38 is operated. Thereby, the heated heat medium flows through the pipe 61a. When the heating unit 70 operates an operation switch (not shown), the on-off valve 73 is opened, the heated heat medium is circulated to the radiator 71, and then the blower 72 is actuated so that the indoor air is discharged by the radiator 71. Is heated.

  Then, when the heat medium flows through the heating heat exchanger 33 by the operation of the third circulation pump 38, the first circulation pump 18 is operated and the hot water for hot water in the first hot water storage tank 10 flows through the primary side tube 31. Thus, the heat medium is heated by receiving hydrothermal energy for hot water supply. The hot water supply water that has been heat-exchanged with the bath water is returned to the hot water storage tank 10. Here, the rotation speed of the first circulation pump 18 and the third circulation pump 38 is controlled so that the hot water temperature of the heat medium detected by the thermistor 55 after heat exchange becomes a predetermined temperature.

  Thereby, while setting the flow volume which distribute | circulates to the primary side tube 31, the flow volume of the heat medium which distribute | circulates the inside of the heat exchanger 33 for heating is set. Incidentally, the predetermined temperature of the hot water temperature of the heat medium detected by the thermistor 55 after heat exchange is set to be different between the floor warming unit 60 and the heating unit 70. For example, when the floor warming unit 60 is operating, About 60 ° C. When only the heating unit 70 is operating, the temperature is about 80 ° C. This is done so as not to exceed the hot water temperature in the temperature range that is optimal for floor heating.

  When the set temperature is reached, the thermal valve 62 or the on-off valve 73 is closed. At this time, when both the thermal valve 62 and the on-off valve 73 are closed, the thermal passage 62a is circulated. ing. Thereby, the floor heating unit 60 and the heating unit 70 can be used for heating by heating the heat medium flowing through the heating heat exchanger 33 using the hot water in the hot water storage tank 10 as a heating source.

  In the present embodiment, the reheating heat exchanger 32 is disposed above the heating heat exchanger 33. However, the present invention is not limited to this, and the heating heat exchanger 33 is disposed above the reheating heat exchanger 32. It may be arranged. In the present embodiment, the heating heat exchanger 33 is set to have a larger number of coil turns than the reheating heat exchanger 32, but this can be set as appropriate based on the heat load. In the present embodiment, the secondary side tubes of the reheating heat exchanger 32 and the heating heat exchanger 33 are set for the primary side tube 31 consisting of one circuit, but the present invention is not limited to this. Two or more circuits may be combined.

  According to the heat exchanger unit of the hot water storage type hot water supply apparatus in the first embodiment described above, it is possible to use the heating medium heated to the heating destination of two circuits or two circuits or more using the stored hot water supply water as a heating source. it can. Further, since the stored hot water supply water is used as a heating source, the manufacturing cost and the product weight can be reduced as compared with the conventional case using a refrigerant.

  The heat exchanger 30 includes a primary side tube 31 through which hot water in the hot water storage tank 10 flows, a reheating heat exchanger 32 and a heating heat exchanger 33 that are secondary side tubes through which a heat medium flows. Since the primary side tube 31, the reheating heat exchanger 32, and the heating heat exchanger 33 are arranged alternately in the same coil shape, these tubes are integrated. The installation space can be saved.

  Further, the reheating heat exchanger 32 and the heating heat exchanger 33 are arranged in the order of one circuit and two circuits from the upper side to the lower side with respect to the longitudinal direction of the primary side tube 31. Since the secondary tubes can be arranged in the vertical direction, the installation area does not have to be greatly expanded. Thereby, the space saving of the heat exchanger unit can be achieved.

  Further, the primary tube 31 and the reheating heat exchanger 32 and the heating heat exchanger 33 are joined by brazing, so that joining is most reliable and the manufacturing cost is low. Furthermore, the heat exchange efficiency between the primary side tube 31, the reheating heat exchanger 32, and the heating heat exchanger 33 is also good.

  Further, the reheating heat exchanger 32 and the heating heat exchanger 33 are connected to a bath reheating apparatus 80 that retreats the bath water so that one of them recirculates the bath water in the bathtub as a heat medium. The other side is connected to the floor heating unit 60 and the heating unit 70 that exchange heat between the heated heating medium and either the fluid to be heated or the object to be heated, so that it is stored in the hot water storage tank 10. It is preferable that the hot water supply water is used for the bath water replenishing device 80, the floor heating unit 60, and the heating unit 70 for heating the bath water.

  In addition, the heating heat exchanger 33 connected to the floor heating unit 60 and the heating unit 70 has a larger number of coil turns than the reheating heat exchanger 32 connected to the bath water reheating device 80. Therefore, the secondary tube can be formed according to the heat load of the application. In the present embodiment, it is possible to easily increase the heat transfer area on the floor heating unit 60 and the heating unit 70 side as compared with the bath water reheating device 80.

  Further, the reheating heat exchanger 32 connected to the bath water reheating device 80 exchanges heat with the primary side tube 31 before the heating heat exchanger 33 connected to the floor heating unit 60 and the heating unit 70. With this configuration, the hot water supply water stored in the hot water storage tank 10 can be used in preference to the floor warming unit 60 and the heating unit 70, so that the bath water replenishment function can be ensured.

(Second Embodiment)
In the first embodiment described above, the primary side tube 31 of the heat exchanger 30 is configured to be connected to the hot water storage tank 10 via the forward pipe 16 and the return pipe 17, but more specifically, as shown in FIG. By configuring the heat exchanger 30 having a shape, it can be integrated with the hot water storage tank 10 formed in a vertically long shape.

  As shown in FIG. 5, the vertically long dimension of the heat exchanger 30 is substantially the same as the vertically long dimension of the hot water storage tank 10, and the primary side tube 31 is formed in a coil shape from the top to the bottom. Further, a reheating heat exchanger 32 as a secondary side tube is formed in a coil shape having substantially the same diameter as the primary side tube 31 above the primary side tube 31, and the primary side tube 31 and the reheating heat exchanger are formed. 32 are alternately arranged, and similarly, a heat exchanger 33 for heating is formed in a coil shape having substantially the same diameter as that of the primary side tube 31, and the primary side tube 31 and the heat exchanger 33 for heating are Are arranged alternately.

  Moreover, 31a shown in the figure is an inflow portion of the primary side tube 31, and is coupled to the outer wall surface of the hot water storage tank 10 by screwing. 31b is the outflow part of the primary side tube 31, Comprising: Although not shown in figure, it is couple | bonded by screwing with the connection port of the 1st pump 18 couple | bonded with the outer wall surface of the hot water storage tank 10 by screwing. And in the primary side tube 31, the unjoined part 31d which is not brazed and joined is formed in the vicinity of the coil shape winding start and winding end.

  As a result, the heat exchanger 30 can be integrated with the hot water storage tank 10, and when the hot water storage tank 10 with the heat exchanger 30 integrated therein is installed at the installation location, it is unjoined at the time of transportation of the logistics to the installation location. Damage to the heat exchanger 30 can be prevented by vibration absorption by the portion 31d.

  In addition, 32a shown in the figure is an inflow portion of the reheating heat exchanger 32, 32b is an outflow portion of the reheating heat exchanger 32, and these are connected to the bath water reheating device 80. It is a connection port with the connection pipes 34 and 35. Moreover, 33a shown in the figure is an inflow part of the heat exchanger 33 for heating, 33b is an outflow part of the heat exchanger 33 for heating, and these are connected to the floor heating unit 60 and the heating unit 70. It is a connection port with connection pipes 36 and 37.

  And these inflow parts 32a and 33a and outflow parts 32b and 33b are connected to connection piping 34, 35, 36, and 37, when constructing a hot water storage type hot-water supply apparatus.

  According to the heat exchanger 30 of the second embodiment described above, the primary side tube 31 has a coil-shaped winding start provided with a connection port, and the reheating heat exchanger 32 and the heating in the vicinity of the upper end and the lower end at which the winding ends. Since the joint portion with the heat exchanger 33 is formed by the unjoined 31d, the heat exchanger 30 can be integrated with the hot water storage tank 10. In other words, when transported in a state where both ends of the primary side tube 31 are joined to the hot water storage tank 10, the stress applied to the primary side tube 31 is absorbed by the unjoined portion with respect to the transport vibration. Is relaxed, and the primary tube 31 can be prevented from being damaged.

(Other embodiments)
In the above embodiment, although the heating unit 70 was comprised with the warm air heater, it can apply also to a bathroom dryer and a clothes dryer besides these. In the above embodiment, the heating heat exchanger 33 is connected to the floor warming unit 60 and the heating unit 70. However, the present invention is not limited to this, and the heating heat exchanger 33 connected to the floor warming unit 60 and the heating are used. The heating heat exchanger 33 connected to the unit 70 may be provided separately.

  In the above embodiment, the heat pump unit 20 using carbon dioxide as a refrigerant has been described as a heat source device. However, the present invention is not limited to this, and a general heat pump cycle using a refrigerant such as chlorofluorocarbon or alternative chlorofluorocarbon may be used. In addition to these, the present invention is applied to a hot water supply apparatus including heating means such as a hot water heater and a water heater using solar heat, gas, and liquid fuel, and the hot water storage tank 10. In addition, tap water or the like may be introduced, heated in the hot water storage tank 10 by an electric heater or the like, and stored as hot water for hot water supply.

It is a schematic diagram which shows the whole structure of the hot water storage type hot water supply apparatus in 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS (a) which shows the whole structure of the heat exchanger 30 in 1st Embodiment of this invention is a top view, (b) is a front view. It is a disassembled perspective view which shows the whole structure of the heat exchanger 30 in 1st Embodiment of this invention. It is sectional drawing which shows the cross-sectional shape of the tube in 1st Embodiment of this invention. It is a front view which shows the whole structure of the heat exchanger 30 in 2nd Embodiment of this invention.

Explanation of symbols

10 ... Hot water storage tank 20 ... Heat pump unit (heating device)
30 ... Heat exchanger 31 ... Primary side tube 32 ... Reheating heat exchanger (secondary side tube)
33 ... Heat exchanger for heating (secondary tube)
60 ... Floor heating unit (heating device)
70 ... Heating unit (heating device)
80 ... Bathing water purifier

Claims (8)

A hot water storage tank (10) for storing hot water supply water heated by the heating device (20) and heat exchange with a heat medium that distributes the hot water supply water in the hot water storage tank (10) to the primary side and distributes it to the secondary side. A heat exchanger unit of a hot water storage hot water supply device comprising a heat exchanger (30) for
In the heat exchanger (30), the primary side which is the heating side is formed by one circuit, and the secondary side to be heated is constituted by at least two circuits or more than two circuits. Unit.   In the heat exchanger (30), the primary side tube (31) through which the hot water supply water in the hot water storage tank (10) flows and the secondary side tubes (32, 33) through which the heat medium flows are substantially the same in coil shape. The heat of the hot water storage type hot water supply apparatus according to claim 1, wherein the primary side tube (31) and the secondary side tube (32, 33) are alternately arranged. Exchange unit.   The said secondary side tube (32, 33) is arrange | positioned from the upper direction to the downward direction with respect to the longitudinal direction of the said primary side tube (31) in order of 1 circuit and 2 circuits. A heat exchanger unit of the hot water storage type hot water supply apparatus according to 2.   4. The heat exchanger (30) according to claim 2 or 3, wherein the primary side tube (31) and the secondary side tube (32, 33) are joined by brazing. Heat exchanger unit for a hot water storage system.   The secondary tube (32, 33) is connected to a bath water reheating device (80) that retreats the bath water so that one of them circulates the bath water in the bathtub as a heat medium. 5. The apparatus according to claim 2, wherein the heating medium is connected to a heating device (60, 70) that exchanges heat between the heated heat medium and either the fluid to be heated or the object to be heated. Heat exchanger unit for a hot water storage system.   The secondary side tube (33) connected to the heating device (60, 70) has more coil turns than the secondary side tube (32) connected to the bath water reheating device (80). The heat exchanger unit of the hot water storage type hot water supply apparatus according to claim 5, wherein the heat exchanger unit is formed in a large number.   The secondary side tube (32) connected to the bath water reheating device (80) has the primary side before the secondary side tube (33) connected to the heating device (60, 70). The heat exchanger unit of the hot water storage type hot water supply apparatus according to claim 5 or 6, wherein the heat exchange unit is configured to exchange heat with the tube (31).   The primary side tube (31) has an unjoined junction with the secondary side tube (32, 33) in the vicinity of the upper end and the lower end at the beginning and end of winding of the coil shape provided with a connection port. The heat exchanger unit of the hot water storage type hot water supply device according to any one of claims 2 to 7, wherein the heat exchanger unit is a heat exchanger unit.

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