JP4284292B2 - Heat pump water heater - Google Patents

Description

  The present invention relates to a heat pump water heater.

  A conventional heat pump water heater has a large-capacity hot water storage tank like an electric water heater, and uses cheap discount electricity at night to boil hot water in the heat pump circuit at night and store it in the hot water storage tank. A hot water storage system that uses hot water during the day was common.

  However, in the above hot water storage system, there are only a hot water storage circuit for storing hot water in the hot water storage tank and a hot water supply circuit for supplying hot water from the hot water storage tank to the use terminal.

  For this reason, when multiple people take a bath after bathing in the bath, it is necessary to reheat by cooling the water, but it was not possible to respond appropriately because there was only a one-sided hot water function from the hot water storage tank. .

  As an improvement measure described above, in recent years, there is a conventional hot water storage system with a bath memorial function added. As such a heat pump hot water supply apparatus, there is one disclosed in Japanese Patent Application Laid-Open No. 2002-106963 (Patent Document 1), which is a system for exchanging heat of hot water in a bathtub (bathtub) with a high-temperature refrigerant, A heat storage tube for hot water storage and a heat transfer tube for bath recuperation are installed in an integrated water refrigerant heat exchanger (radiator), and bath water is heated by heating the hot water in the bath at the refrigerant temperature that boiles the water in the hot water storage tank. It was.

  In addition, as a method of exchanging heat from the hot water in the bathtub with the hot water stored, there is JP-A-2003-336894 (Patent Document 2), and a heat exchanger for bath is provided separately from the heat exchanger for hot water storage, The bath heat exchanger exchanged heat between the hot water of a certain temperature stored in the hot water storage tank and the remaining hot water in the bathtub with the bath heat exchanger.

  A water-refrigerant heat exchanger comprising the refrigerant heat transfer tube and the hot water storage heat transfer tube is wound around the outer periphery of the hot water storage tank.

Further, a plurality of temperature sensors are attached to the surface of the hot water storage tank, and the heat pump operation is performed by detecting the presence or absence of the hot water amount in the hot water storage tank or the hot water temperature.

  However, after the water refrigerant heat exchanger is attached to the hot water storage tank, the temperature sensor is desorbed by the heat transfer tube of the water refrigerant heat exchanger comprising the refrigerant heat transfer tube and the hot water heat transfer tube. In particular, there is a problem that the intermediate temperature sensor cannot be detached.

JP 2002-106963 A JP 2003-336894 A

  In the above conventional heat pump water heater, the idea of “operating at night with low electricity charges and storing as much as possible in the hot water storage tank” has permeated, and the heating efficiency (heating capacity ÷ consumption) due to the heating temperature difference in the bath chasing operation There has not been much study on the power (also referred to as COP).

Therefore, in the bath chasing operation, it is naturally considered to heat at the hot water storage temperature of the hot water storage tank, and in any conventional example, the heating side fluid is heated to a constant high temperature equivalent to the hot water storage temperature. If the chasing operation is performed during bathing, there is a possibility that hot water close to the hot water temperature exceeding the appropriate temperature may be returned, and the control is not optimal from the viewpoint of heating efficiency.

In addition, in a heat pump hot water supply device in which a water refrigerant heat exchanger is wound around the outer circumference of the hot water storage tank, a plurality of temperature sensors are attached and managed in order to accurately grasp the temperature of the hot water stored in the hot water storage tank. It becomes important. In order to continue to manage the temperature sensor, it is required that the temperature sensor has a mounting structure that is always easy to maintain, but there has been no suggestion about this point with respect to the above-described known examples.

  The present invention is for solving the above-described conventional problems, and is a heat pump hot water supply apparatus that eliminates the return of high-temperature water during bath chase operation and can greatly improve the heating efficiency of heat pump operation compared to the conventional one. It is intended to provide.

  Another object of the present invention is to provide a heat pump hot water supply device that can always manage the hot water temperature in the hot water storage tank and can operate the hot water supply device efficiently.

  In order to solve the problems in the bath chase operation of the conventional heat pump water heater, the present invention improves the operation efficiency by reducing the refrigerant throttle amount of the decompression device, setting the low speed rotation speed, and lowering the heating temperature. In addition, focusing on the fact that heat release to the surroundings is reduced when the heating side temperature is lowered in the heat exchanger, the heating side fluid temperature of the bath heat exchanger is made lower than the hot water storage temperature regardless of the conventional hot water storage temperature. By doing so, the high-temperature water return is eliminated and the heating efficiency is improved. Further, the hot water temperature in the hot water storage tank can always be accurately grasped.

That is, a heat pump refrigerant circuit in which a compressor, a water refrigerant heat exchanger that performs heat exchange between water and refrigerant, a decompression device, and an evaporator that performs heat exchange between air and refrigerant are sequentially connected via a refrigerant pipe; A water refrigerant heat exchanger, a hot water storage tank for storing hot water heated by the water refrigerant heat exchanger, an in-machine circulation pump for circulating hot water in the machine, a hot water mixing valve, a flow rate adjusting valve, and a connection between these components Connected between a hot water supply circuit consisting of water piping, a bath heat exchanger that exchanges heat between the hot water in the bathtub and the fluid on the heating side, a bath circulation pump that circulates the hot water in the bathtub, a flow switch, and these components Bath remedy circuit composed of a water pipe and an operation control means for controlling the operation of the compressor, decompression device, in-machine circulation pump, hot water mixing valve, flow rate adjustment valve, bath circulation pump, etc. The bath water Performs heat-pump operation with circulating on board, the heating-side fluid temperature in the heat exchanger for the bath, below the tank hot-water temperature, and is used to control higher than the temperature of the remaining hot water circulating from the bathtub. Further, since the heat pump operation is performed during the bath chasing operation and the hot water in the hot water storage tank is not used, there is no possibility of running out of hot water in the hot water supply immediately after the bath chasing operation.

According to the above-described configuration, the heat pump operation in the conventional bath chase operation is the hot water storage temperature of the hot water storage tank, whereas the heat pump operation of the present invention operates at a temperature lower than the hot water storage temperature, so the hot water in the bathtub In addition to eliminating the risk of return, the heating efficiency can be improved.

Further, the water refrigerant heat exchanger of the heat pump cycle is provided in such a manner that the refrigerant side heat transfer tube and the water supply side heat transfer tube are in thermal contact with each other and arranged in a spiral shape on the outer periphery of the cylindrical hot water storage tank. In the heat pump hot water supply apparatus in which the hot water heated by the heat exchanger is stored in the hot water storage tank and the stored hot water amount is detected by a temperature sensor attached to the surface of the hot water storage tank. In the refrigerant side heat transfer tube and the water supply side heat transfer tube, a winding deformation part is provided in a part of the cylindrical axis direction and a part of the circumferential direction in which the distance from the hot water storage tank partially extends outward. In addition, since the space where the temperature sensor can be attached from the outside is provided on the surface of the hot water storage tank, the temperature of the hot water storage tank around which both pipes are wound can be accurately measured. . Further, even when the temperature sensor is replaced for service or the like, this can be easily performed.

In addition, a heat insulating material is provided so as to cover the surface of the hot water storage tank, and the water-refrigerant heat exchanger is disposed on the outer periphery of the hot water storage tank via the heat insulating material, and wound around the refrigerant side heat transfer tube and the water supply side heat transfer tube. A notch window is made in the heat insulating material corresponding to the deformed part, and a temperature sensor is attached to the surface of the hot water tank facing the notched window. The surface temperature of the hot water storage tank can be measured.

In addition, the gap between the winding deformation part created by partially expanding the refrigerant side heat transfer tube and the water supply side heat transfer tube that are wound up at a regular pitch in a spiral shape is more than the temperature sensor that the temperature sensor attached to the hot water storage tank surface can be easily attached and detached. It is a large gap. Therefore, the worker at the time of assembly or service can easily attach and detach the temperature sensor with his / her hand using the gap formed by the pitch expansion and pipe deformation.

In addition, the position of the winding deformation part made by partially expanding the refrigerant side heat transfer tube and the water supply side heat transfer tube that are in thermal contact with each other is opposed to the corner of the rectangular cabinet that forms the outer shell of the hot water supply device body. Therefore, the deformable portion can be accommodated without expanding the outer shape of the hot water supply apparatus.

In addition, a winding pitch expansion portion is formed by winding the refrigerant side heat transfer tube and the water supply side heat transfer tube so that a winding pitch is larger than other portions in the winding deformation portion. The pipes wound around the vertical hot water storage tank through the interval holding pipes holding the refrigerant side heat transfer tubes and the water supply side heat transfer tubes are contracted by their own weight. Therefore, the deformed portion is always held in a fixed shape, and the temperature sensor can be easily attached and detached through the deformed portion.

In addition, when attaching a plurality of temperature sensors to the hot water storage tank arranged vertically, the upper and lower temperature sensors are located where the refrigerant side heat transfer pipe and the water supply side heat transfer pipe are not wound, and an intermediate temperature sensor. Is attached to a position corresponding to the winding deformation part , so that the amount of water (heat amount) in the hot water storage tank can be accurately measured, and a predetermined amount of hot water can always be secured in the hot water storage tank by automatic operation or the like. Is.

  Also, the refrigerant side heat transfer tubes and the water supply side heat transfer tubes of the two sets of heat pump cycles are arranged in contact with each other so that heat exchange is possible, and the outer periphery of the hot water tank is provided with a shape wound up via a heat insulating material. Of course, the hot water storage tank can be downsized, and the water supply side heat transfer pipe temperature can be raised to a predetermined temperature in a short time.

Further, as the water-refrigerant heat exchanger, the first placed at different positions in the hot water storage tank, a second water-refrigerant heat exchanger is provided, these first and second coolant-refrigerant heat exchanger to each other, their connection parts are by connecting the hot water storage tank so as to spread outwardly, since the connecting portion is obtained by said winding deformation portion, between the water-refrigerant heat exchanger pipe connection in order to use the connection pipe, the front and rear of the tube Although the diameter is different from the diameter, the portion with the different pipe diameter is expanded outside the winding radius of the outer periphery of the hot water storage tank, and the other portions can be wound up at the same pitch and the same diameter.

  In addition, since welding is performed away from the tank, it can be easily performed, so that it is not necessary to use a long pipe. For this reason, productivity is also improved.

  As described above, according to the present invention, the temperature of the hot water storage tank in which the water refrigerant heat exchanger pipe and the water supply side heat transfer pipe pipe of the heat pump cycle are wound can be accurately measured. is there. Further, even when the temperature sensor is replaced for service or the like, this can be easily performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention will be described with reference to FIG.
The heat pump hot water supply apparatus includes a heat pump refrigerant circuit 30, a hot water supply circuit 40, and an operation control means 50.

  The heat pump refrigerant circuit 30 is a two-cycle system having two parts each, and includes refrigerant-side conduction tubes 2a and 2b, decompression devices 3a and 3b, and evaporators arranged in the compressors 1a and 1b and the water-refrigerant heat exchanger 2. 4a and 4b are sequentially connected via a refrigerant pipe, and a refrigerant is sealed therein.

  The compressors 1a and 1b can be controlled in capacity, and are operated with a large capacity when supplying a large amount of hot water. Here, the compressors 1a and 1b are controlled in rotation speed from low speed (for example, 700 rotations / minute) to high speed (for example, 7000 rotations / minute) by PWM control and voltage control (for example, PAM control and combination control thereof). It has become.

  The water refrigerant heat exchanger 2 includes refrigerant side heat transfer tubes 2a and 2b and water supply side heat transfer tubes 2c and 2d, and performs heat exchange between the refrigerant side heat transfer tubes 2a and 2b and the water supply side heat transfer tubes 2c and 2d. It is configured as follows.

An expansion valve or the like is generally used as the decompression devices 3a and 3b, and the medium temperature and high pressure refrigerant sent via the water refrigerant exchanger 2 is decompressed and sent to the evaporators 4a and 4b as low pressure refrigerant that is easily evaporated. Further, the decompression devices 3a and 3b function to adjust the refrigerant circulation amount in the heat pump circuit by changing the throttle amount of the refrigerant passage, or send the medium refrigerant to the evaporators 4a and 4b in a large amount by fully opening the throttle amount. It also serves as a defroster that melts frost.

  The evaporators 4a and 4b are air refrigerant heat exchangers that exchange heat between air and refrigerant.

  The hot water supply circuit 40 includes a water circulation circuit for performing hot water storage, direct hot water supply, tank hot water supply, tank reheating, bath hot water filling, and bath reheating.

  The hot water storage circuit is configured by sequentially connecting a hot water storage tank 8, an in-machine circulation pump 9, a hydrothermal water exchange amount sensor 11, a water supply side heat transfer pipe 2c, 2d, a hot water supply mixing valve 12, and a hot water storage tank 8 via a water pipe.

  The direct hot water supply circuit includes a water supply fitting 5, a pressure reducing valve 6, a water supply water amount sensor 7, a water supply check valve 10, a hydrothermal water exchange amount sensor 11, a water supply side heat transfer pipe 2 c and 2 d, a hot water supply mixing valve 12, a hot water mixing valve 13, and a flow rate. The adjustment valve 14 and the kitchen tapping metal fitting 15 are sequentially connected via a water pipe.

  The water supply fitting 5 is connected to a water supply source such as a water supply, and the kitchen tap fitting 15 is connected to a kitchen faucet 16 or the like.

  In the tank hot water supply circuit, a water supply fitting 5, a pressure reducing valve 6, a supply water amount sensor 7, a hot water storage tank 8, a hot water supply mixing valve 12, a hot water mixing valve 13, a flow rate adjusting valve 14, and a kitchen tapping metal fitting 15 are sequentially connected through a water pipe. It is configured.

  The tank memory circuit is configured by sequentially connecting a hot water storage tank 8, an in-machine circulation pump 9, a hydrothermal water exchange amount sensor 11, a water supply side heat transfer pipe 2c, 2d, a hot water supply mixing valve 12, and a hot water storage tank 8 through a water pipe. Yes.

  The bath hot water filling circuit includes a water supply fitting 5, a pressure reducing valve 6, a water supply water amount sensor 7, a water supply check valve 10, a hydrothermal water exchange amount sensor 11, water supply side heat transfer tubes 2c and 2d, a hot water supply mixing valve 12, a hot water mixing valve 13, A flow rate adjusting valve 14, a bath pouring valve 17, a flow switch 18, a bath circulation pump 19, a hot water inlet / outlet fitting 20, a bath circulation adapter 21, and a bathtub 22 are sequentially connected via a water pipe. Moreover, it connects so that it can supply hot water to the bath faucet 26 and the shower (not shown) from the entrance / exit metal fitting 20 with the bathtub 22.

  In addition, during bath hot water filling, hot water supply from the hot water storage tank 8 to the bathtub 22 is performed in a range where the amount of hot water in the hot water storage tank 8 does not fall below the minimum required amount, as well as direct hot water supply by the bath hot water filling circuit.

  The bath memorial circuit is composed of a bathtub 22, a bath circulation adapter 21, an inlet / outlet fitting 20, a bath circulation pump 19, a flow switch 18, a bath water heat transfer pipe 23b, a bath outlet fitting 24, a bath circulation adapter 21, and a bathtub 22 with water piping. Are connected in sequence.

  At the time of bathing, the bath water is circulated by the bath chasing circuit, the heat pump operation and the in-machine pump 9 are operated, and hot water heated by the water-refrigerant heat exchanger 2 is provided in the bath heat exchanger 23. The hot water heat transfer tube 23a is circulated, and heat exchange is performed between the hot water heat transfer tube 23a and the bath water heat transfer tube 23b to perform bath replenishment.

  Next, the operation control means 50 performs operation / stop of the heat pump refrigerant circuit 30 and rotation control of the compressors 1a, 1b and operation of the refrigerant remote control of the decompression devices 3a, 3b according to operation settings of the kitchen remote controller 51 and the bath remote controller 52. Hot water storage operation by controlling the amount adjustment, the operation / stop of the in-machine circulation pump 9 and the bath circulation pump 19, and the hot water mixing valve 12, the hot water mixing valve 13, the flow rate adjusting valve 14, the bath pouring valve 17, and the hot water on / off valve 25 Direct hot water supply operation, tank hot water supply operation, tank remedy operation, bath hot water operation, and bath remedy operation are performed.

  The operation control means 50 controls the rotation speed of the compressors 1a and 1b, and immediately after the start of operation, the operation control means 50 operates at a predetermined high speed rotation speed in order to shorten the heating start-up time. During operation, it is controlled to operate at a low speed corresponding to the heating temperature.

  In addition, after using hot water at the water-use terminal, every time the hot water storage tank is controlled so that hot water of a predetermined temperature is stored in a full tank at any time by stopping the operation after performing the hot water storage operation of the tank. It has a hot water storage operation function.

  Further, the heat pump hot water supply device includes a water supply thermistor 7a for detecting the water supply temperature, a heat exchanger thermistor 2e for detecting the hot water temperature of the water refrigerant heat exchanger 2, a tank thermistor 8a for detecting the hot water storage temperature and the amount of hot water stored in the hot water storage tank 8. 8b, 8c, 8d, hot water supply thermistor 14a for detecting the hot water supply temperature, bath thermistor 18a for detecting the temperature of the bath water, and pressure sensors 1c, 1d for detecting the discharge pressure of the compressors 1a, 1b, and the water level in the bath 22 A water level sensor 22 a for detection is provided, and each detection signal is configured to be input to the operation control means 50. The operation control means 50 controls each device based on these signals.

  The hot / cold water open / close valve 25 is provided between the water / refrigerant heat exchanger 2 and the bath heat exchanger 23, and the water circuit is closed and the bath / heat exchanger 23 is closed from the water / refrigerant heat exchanger 2 except during bath replenishment. This is to prevent the leakage of heat to.

  The water supply check valve 10 allows water to flow only in one direction to prevent backflow, and the relief valve 27 operates when the hot water pressure in the hot water storage tank 8 exceeds a predetermined level. It serves to protect the pressure of circuit components.

  Next, the operation of the heat pump hot water supply apparatus will be described based on the flowcharts of FIGS. 2 to 6 with reference to the heat pump circuit 30 and the hot water supply circuit 40 of FIG.

  FIG. 2 is an example of a flowchart showing the necessary operations during installation.

  The heat pump hot water supply device is transported from the manufacturing site and installed at the installation location desired by the user. The water supply fitting 5 is a water supply source such as water supply, the kitchen hot water supply fitting 15 is the kitchen faucet 16, and the bath hot water supply fitting 24 is the bath. After being connected to the faucet 26 (step 60), the faucets 16, 26 or the relief valve 27 are opened for air venting (step 61), and the main plug of the water supply source is opened (step 62). The water is adjusted to a constant pressure by the pressure reducing valve 6 and then flows into the hot water storage tank 8, the water / refrigerant heat exchanger 2 and each water pipe (step 63). After confirming that the interior of the machine is full due to overflow of water from the faucets 16 and 26 or the relief valve 27 (step 64), the faucets 16 and 26 or the relief valve 27 are closed and the in-flight water supply is finished (step). 65).

  In addition, each apparatus at the time of installation of a heat pump hot-water supply apparatus is set to the following initial states. That is, the hot water supply mixing valve 12 and the hot water mixing valve 13 are in a bi-directional state, the flow rate adjustment valve 14 and the water on / off valve 25 are open, and the bath pouring valve 17 is closed.

  Next, the power switch is turned on (step 66), and the bath water filling operation is performed (step 67).

  In the bathtub water filling operation, the bath pouring valve 17 is opened and water is poured into the bathtub until the water overflows (step 68). The capacity of the bathtub is automatically calculated by the water level sensor 22a and the water supply amount sensor 7 (step 69), and the bathtub capacity is set. (Step 70) is performed, which is utilized for bath hot water filling in bath automatic operation after setting, hot water control at the time of bathing, and the like. Therefore, the bath water filling operation is required only once when the heat pump hot water supply apparatus is set.

  Next, FIG. 3 is an example of a flowchart showing a hot water storage operation for boiling water in the hot water storage tank.

  When a hot water storage operation instruction is issued under the control of the operation control means 50 (step 71), the tank thermistors 8a to 8d determine the hot water temperature and the hot water storage amount (step 72). If the stored hot water is used and reduced below the specified value, the hot water storage operation is started (step 73).

  In this hot water storage operation (step 73), the operation of the compressors 1a and 1b is started, and the gaseous refrigerant in the compressors 1a and 1b is compressed and heated to become a high-temperature and high-pressure refrigerant and sent to the water refrigerant heat exchanger 2. . As a result, in the water refrigerant heat exchanger 2, the high-temperature refrigerant flowing in the refrigerant side heat transfer tubes 2a and 2b and the water flowing in the water supply side heat transfer tubes 2c and 2d exchange heat, the refrigerant dissipates heat, and the water is heated. The The radiated refrigerant is depressurized by the decompression devices 3a and 3b, and further expanded and evaporated by the evaporators 4a and 4b to become a gaseous state and return to the compressors 1a and 1b again. By continuing this heat pump operation, the water passing through the water-refrigerant heat exchanger 2 is heated.

  In the heat pump operation, when the rotation speed of the compressors 1a and 1b is increased and the refrigerant throttle amount of the decompression devices 3a and 3b is increased, the heating capacity is increased, but the mechanical loss and the heat loss are increased and the operation efficiency is decreased. Conversely, by reducing the number of rotations of the compressors 1a and 1b and reducing the refrigerant throttle amount of the decompression devices 3a and 3b, the heating capacity is reduced, but the mechanical loss and heat loss are reduced, and the operation efficiency is relatively improved. To do. That is, in the heating operation by the heat pump, it can be said that heating efficiency is improved by heating at a low temperature over time.

  In the hot water storage operation step 73, along with the heat pump operation, in the hot water storage circuit, the hot water supply mixing valve 12 is opened from the water / refrigerant exchanger 2 side, the hot water storage tank 8 side is opened, the hot water mixing valve 13 side is closed, and the hot water on / off valve 25 is closed. (Step 73a). Further, the operation of the in-machine circulation pump 9 is started, and the in-machine circulation pump 9, the hydrothermal water exchange amount sensor 11, the water / refrigerant heat exchanger 2, the hot water supply mixing valve 12, and the hot water storage tank 8 are passed through the water inlet at the bottom of the hot water storage tank 8. Water circulates. As a result, the hot water heated by the water-refrigerant heat exchanger 2 is stored from the upper part of the hot water storage tank 8, and when the entire hot water storage tank 8 reaches the boiling state, it is determined that the hot water storage is complete (step 76), and the operation is stopped. (Step 77).

  Note that the hot water temperature determination (step 74) for determining whether or not the temperature of the heated water discharged from the water heat exchanger 2 is appropriate is performed by the heat exchanger thermistor 2e, and when the hot water temperature is within a specified value. The hot water storage operation is continued as it is (step 75), and if it is outside the specified value, the temperature of the hot water is adjusted by controlling the rotational speed of the compressors 1a and 1b, adjusting the throttle amount of the decompression devices 3a and 3b, and controlling the rotational speed of the in-machine circulation pump 9. (Step 74a).

  The determination of the hot water storage temperature and the amount of hot water storage is performed by the tank thermistors 8a to 8d. If all of the tank thermistors 8a to 8d reach the specified temperature, it is determined that the hot water storage is complete, the operation is stopped, and the tank hot water storage is finished (step). 77).

FIG. 4 is an example of a flowchart showing the operation when the kitchen faucet 16 is opened and hot water is used.
When the kitchen faucet 16 is opened and the use of hot water is started (step 80), the operation control means 50 starts the compressors 1a and 1b and starts the operation of the heat pump circuit 30, and the water supply fitting 5, the pressure reducing valve 6, and the amount of water supply By the hot water supply circuit of the sensor 7, the water supply check valve 10, the hydrothermal water exchange amount sensor 11, the water refrigerant heat exchanger 2, the hot water mixing valve 12, the hot water mixing valve 13, the flow rate adjustment valve 14, the kitchen tapping metal 15 and the kitchen faucet 16. Direct hot water supply operation (step 81) is performed. At the same time, a tank hot water supply operation is performed by a hot water supply circuit of a water supply fitting 5, a pressure reducing valve 6, a water supply amount sensor 7, a hot water storage tank 8, a hot water supply mixing valve 12, a hot water mixing valve 13, a flow rate adjusting valve 14, a kitchen outlet fitting 15, Step 82) is performed.

  Here, the heat pump refrigerant circuit 30 sends the high-temperature refrigerant compressed by the compressors 1a and 1b to the refrigerant-side heat transfer tubes 2a and 2b of the water-refrigerant heat exchanger 2, and the water flowing in from the water supply-side heat transfer tubes 2c and 2d. Although it heats and flows out to the hot water supply mixing valve 12 side, at the start of operation, the refrigerant sent to the water-refrigerant heat exchanger 2 is not sufficiently high-temperature and high-pressure, the temperature is low, and the whole water-refrigerant heat exchanger 2 is cooled. Therefore, the heating capacity for heating water is not sufficient. As the time elapses, the refrigerant becomes high temperature and pressure, and accordingly, the amount of heat released from the generated refrigerant increases, and the ability to heat water increases.

  In addition, since it usually takes about 5 to 6 minutes for the heating capacity of the heat pump operation to reach the high temperature stable state, the operation control means 50 is configured to rotate the compressor for a predetermined time until the high temperature stable state immediately after the operation starts. The number of rotations can be controlled at a higher speed than usual, and the rise time of the water heating and hot water supply operation can be shortened to about 3 to 4 minutes. However, for a predetermined time (about 4 to 5 minutes) immediately after the operation starts, After performing the tank hot water supply operation (step 82) for supplying water, the operation control means 50 operates to stop the tank hot water supply operation (step 84b), and switch to the direct hot water supply operation only and continue the hot water supply operation (step 85). .

  During this time, the hot water supply thermistor 14a and the feed water amount sensor 7 determine the hot water supply temperature and flow rate (step 83). If the temperature is not specified, the temperature and flow rate are adjusted (step 84a). (Step 84).

  In the determination step 84 of the direct hot water supply temperature, when the heating temperature in the water / refrigerant heat exchanger 2 is insufficient and the direct hot water supply temperature does not reach the specified temperature, the temperature flow rate adjustment (step 84a) of the heat pump operation is continued. Used in combination with operation (step 82). If the heating temperature in the water-refrigerant heat exchanger 2 rises sufficiently to the hot water supply temperature and the direct hot water supply temperature falls within the specified range, the tank hot water supply operation is stopped (step 84b), and the direct hot water supply operation (step 81) alone. The hot water supply is continued (step 85).

  Therefore, the role of the hot water storage tank 8 is an auxiliary one at the time of start-up until the heating capacity of the heat pump operation reaches a temperature sufficient for the hot water supply temperature (usually 40 to 42 ° C.). In particular, the larger the compressor output, the shorter the startup time and the smaller the hot water storage tank 8.

  In addition, in order to cope with simultaneous use of a plurality of places by direct hot water supply such as performing hot water supply in the kitchen simultaneously with bath hot water filling, the capacity of the compressors 1a and 1b is four times that of about 5KW which is generally used conventionally. Although it is desirable to increase it to about 20 KW as described above, it is not only necessary to develop a new compressor, but also to newly examine each part of the heat pump refrigerant circuit 30, which is extremely difficult. Therefore, in this embodiment, the two-cycle heat pump systems 30a and 30b that use twice as much a compressor as that of the conventional compressor are used, and the reliability of the conventional technology and the results is ensured. If the capacity is sufficient, the application and effect of the present invention will not change even in the one-cycle heat pump system.

Next, when the faucet is closed and the use of hot water is completed (step 86), if the tank hot water supply operation is stopped and only the direct hot water supply operation is performed, the direct hot water supply operation is stopped. When both are used, both the direct hot water supply operation and the tank hot water supply operation are stopped. (Step 87)
Further, after stopping both the tank hot water supply operation and the direct hot water supply operation (step 87), the operation control means 50 always starts the tank hot water storage operation (step 88), and detects the hot water storage temperature and the hot water storage amount by the tank thermistors 8a to 8d. Then, it is determined that the hot water storage has been completed (step 89), the operation is stopped after the temperature is within the specified value, and the tank hot water storage is terminated (step 90).

  However, the tank thermistors 8a to 8d always detect the hot water storage state, and both the hot water temperature and the hot water temperature remain at a predetermined value or more in the hot water storage tank 8 even after the water heating hot water supply operation is stopped because the tank thermistors 8a to 8d are used for an extremely short time. In this case, it is determined that the hot water storage is completed, and the tank hot water storage operation (step 88) is not performed.

  As described above, since the operation control means 50 has a hot water storage operation function every time the tank hot water storage operation (step 88) is performed until the hot water storage is completed after completing the target operation in every operation. The tank 8 always stores a predetermined amount or more of hot water at a predetermined temperature, so that it is possible to eliminate the concern about the hot water temperature at the start of the operation or the hot water being used.

  FIG. 5 is a flowchart showing an embodiment of a hot water filling operation by bath automatic operation. The bath automatic button is pressed and turned on (step 91). When the set time comes, bath hot water filling operation starts (step 92), the bath pouring valve 17 is opened, and bath hot water supply is performed (step 93). .

  In the bath hot water supply (step 93), the direct hot water supply operation and the tank hot water supply operation are used in combination as in the hot water use described with reference to FIG. That is, the direct hot water supply operation and the tank hot water supply operation are performed simultaneously for 4 to 5 minutes immediately after the start of the heat pump operation. When the direct hot water supply temperature reaches a stable state, the tank hot water supply operation is stopped and only the direct hot water supply operation is performed. However, in the case of bath hot water reserved for a timer, hot water may be supplied by heat pump operation alone without performing tank hot water as much as possible.

  Further, during the bath water supply operation, the bath thermistor 18a detects the bath hot water temperature to determine the hot water supply temperature (step 94). If the temperature is not specified, the temperature is adjusted (step 94a). (Step 95).

  Furthermore, the water level in the bathtub is detected by the water level sensor 22a, and the amount of bathing water is determined (step 96).

  In the bath hot water filling amount determination (step 96), the bath hot water supply is continued (step 95) if it is outside the specified range, and when it is within the specified range, the bath hot water supply and the heat pump operation are stopped (step 97), and the bath hot water filling operation ends. (Step 98).

  FIG. 6 is an example of a flowchart showing bath remedy by automatic bath operation.

  The bath automatic button is turned on (step 100), and when the set time comes, the bath filling operation described in FIG. 5 is started (step 101), and then the bath filling operation is terminated (step 102). Then, the bath heat insulation operation is started (step 103).

  After completion of the bath hot water operation (step 102), the hot water is detected by the bath thermistor 18a. If the hot water temperature in the bathtub is determined within the judgment value (step 104), the bath is kept warm. A memorial operation is performed (step 105). In addition, when the water level sensor 22a detects the amount of hot water in the bathtub every predetermined time (for example, 10 minutes) and the bath hot water amount determination (step 106) is within the specified value, the bath temperature is kept, and if it is below the specified value Performs bath addition hot water (step 107).

  Further, when the set time for automatic bath operation has elapsed, the bath heat retention operation is terminated (step 108), and the automatic bath operation is terminated (step 109).

  Next, thermal efficiency in the bath chase operation (step 105) will be described.

  FIG. 7 is a diagram showing the relationship between the temperature difference between the heating side fluid of the bath heat exchanger 23 and the bath water and the heating efficiency (COP) in the heat pump hot water supply apparatus shown in FIG. The smaller the temperature difference, the higher the heating efficiency, and the maximum value is when the temperature difference is about 10K.

  FIG. 8 is a diagram showing a case where bathing is performed a plurality of times. As an example, a bathing time elapses when bath water cooled to 30 ° C. is bathed to approximately 40 ° C., and a change in heating side fluid temperature and bath side circulating water temperature are shown.

  The line Y in FIG. 8 indicates the bathtub-side circulating water temperature, and indicates that the bath is heated to 30 ° C. at the start of chasing and 40 ° C. at the end of chasing.

  The line T indicates the conventional heating side fluid temperature, and the hot water storage temperature of the hot water storage tank is constant at about 65 ° C., so the difference from the bath side circulating water temperature is a temperature difference of 25K to 35K, and in the heating efficiency of FIG. It was far from the optimum value.

  Line A shows an example of the heating-side fluid temperature of the present invention. The temperature difference between the heating-side fluid temperature and the bathtub-side circulating water temperature is set to a constant value (about about the maximum heating efficiency from the start of tracking to the end of tracking). 10K), which is suitable when heating efficiency is given the highest priority regardless of the remedy time.

  Line B is heated at a high temperature when the bath circulation water temperature is low, and the heating side fluid temperature is gradually lowered as the reheating time elapses, and the heating efficiency is lower than that of the line A. It is possible to perform a chasing operation that is higher than (line T) and emphasizes the chasing time.

  Fig. 9 shows a case where bathing is performed after bathing the next day in consideration of water saving. As an example, the bathing time of bath water that has been chilled to 20 ° C and bathing to approximately 40 ° C, and the heating time. The change of the side fluid temperature and the bathtub side circulating water temperature is shown. The line Y and the line T show the bathtub side circulating water temperature and the conventional heating side fluid temperature similarly to FIG.

  Line C is for gradually increasing the heating-side fluid temperature as the chasing time elapses, but because the bath-side circulating water temperature at the start of chasing is low, the temperature difference at the beginning of chasing is increased. In addition, it is possible to perform a chasing operation that places importance on thermal efficiency and also considers chasing time.

  The line D changes the heating side fluid temperature in a stepwise manner in order to simplify the temperature control in the chasing operation, and the variation factor due to the temperature followability of the thermistor can be reduced.

  Line E is a further advancement of the idea of line D. The heating side fluid temperature is set to a constant temperature lower than the hot water storage temperature regardless of the passage of time, and the lower the bath side circulating water temperature, The temperature difference is large, and it is possible to perform a constant heat pump operation taking into account the remedy time.

  In addition, although line A-line E were divided and demonstrated to FIG. 8, FIG. 9, it can apply regardless of the height of bathtub side circulating water temperature, and can obtain an effect.

  As described above, the chasing operation indicated by the lines A to E is characterized by each, and among these, any one or more of them is incorporated into the heat pump operation control means as the chasing operation mode, and according to the remaining hot water temperature of the bathtub, By making the bath memorial operation mode selectable, an appropriate bath memorial operation can be performed according to the remaining hot water temperature, time zone, season, and the like.

  Next, another embodiment of the present invention will be described with reference to FIG.

  FIG. 10 shows an embodiment in which the heating capacity of the heat pump is very large, and the hot water supply operation can be handled only by direct hot water supply without a hot water storage tank.

  The component configurations of the heat pump refrigerant circuit 30, the hot water supply circuit 40, and the operation control means 50 are almost the same as those in the first embodiment. The difference is that there is no hot water storage tank and its related components, and the heat exchanger 23 for bath The configuration is different.

  In the first embodiment, during the hot water supply operation, the tank hot water and the direct hot water supply are used together immediately after the start of the operation. However, in this second embodiment, only the direct hot water supply is used, so the hot water storage tank 8, the in-machine circulation pump 9 in FIG. The hydrothermal water exchange amount sensor 11 and the hot water supply mixing valve 12 are not provided.

  In FIG. 10, one of the heat pump refrigerant circuits 30a uses two refrigerant on-off valves 28, and is provided between the compressor 1a and the water refrigerant heat exchanger 2 and between the compressor 1a and the bath heat exchanger. When bathing, the refrigerant is circulated to the bath heat exchanger 23 side, and during other operations, the refrigerant is controlled to circulate to the water / refrigerant heat exchanger 2 side. Since only one heat pump refrigerant circuit 30a is operated and no refrigerant is circulated to the water refrigerant heat exchanger 2 side, heat loss can be reduced and further thermal efficiency can be improved.

Even in the heat pump configuration of FIG. 10, there is no improvement effect of the bath chase operation of the present invention, and by setting the heating side fluid temperature lower than the conventional tank hot water temperature and higher than the remaining hot water temperature circulating from the bathtub, The possibility of returning to high temperature water is reduced, and the heating efficiency can be improved.

  As described above, the present invention can be applied regardless of whether the hot-side fluid in the bath heat exchanger 23 is hot water or refrigerant, and can be applied regardless of the presence or absence of the hot water storage tank 8 and the number of the heat pump refrigerant circuit 30, and sufficient effects. It is what has.

  The installation structure of the heat pump hot water supply apparatus configured as described above, in particular, the compressor and the evaporator constituting the heat pump refrigerant circuit is summarized in the forms and configurations shown in FIGS. This will be described with reference to the drawings.

  FIG. 11 is a front view of the heat pump hot water supply apparatus according to the first and second embodiments, and is a view in which the front plate is removed. 12 is a side view of FIG. 11, and FIG. 13 is a top view of FIG.

  14 is an enlarged view of a portion A in FIG. 13, and FIG. 15 is an enlarged front view of the refrigerant side heat transfer tube and the water supply side heat transfer tube constituting the water refrigerant heat exchanger used in FIG. 12. FIG. 16 is an explanatory view of the deforming portion shown in FIG. 15, and FIG. 17 is a view for explaining an embodiment different from FIG.

  In the figure, the main body 31 of the heat pump hot water supply apparatus 31 divides the inside of a box-shaped cabinet 31a into left and right spaces by a partition plate 37, and the compressors 1a and 1b constituting the heat pump cycle in the left space and the evaporator 4a. 4b, and components such as the fans 34 and 35 and the electrical component box 35 are accommodated.

  On the other hand, in the space on the right side of the partition plate 37, the water refrigerant heat exchanger 2 provided in a spiral (coil) shape and the cylindrical hot water storage tank 8 inserted into the coil portion of the water refrigerant heat exchanger 2. And components such as a reheating heat exchanger (not shown) positioned at a corner on the back side of the right space and an electrical component box 41 positioned on the front side of the water-refrigerant heat exchanger 2 are stored. ing. That is, the partition plate 37 cuts off air and heat between the evaporator 4a (4b) side and the hot water storage tank 8 side. The base 38 at the bottom of the box-shaped cabinet 31a is provided so as to float from the installation surface by the legs 42.

  Moreover, the partition board 37 is bent and provided so that it may turn to the back side of the hot water storage tank 8 in the back side of the box-type cabinet 31a. Thereby, even if the width of the box-type cabinet 31a is narrowed, the necessary heat radiation area of the evaporators 4a and 4b is ensured. The water-refrigerant heat exchanger 2 is configured by thermally contacting the refrigerant-side heat transfer tubes 2a and 2b and the water supply-side heat transfer tubes 2c and 2d.

  The compressors 1a and 1b and the hot water storage tank 8 are fixed to and supported by the base 38, respectively. Further, an upper space in which the evaporators 4 a and 4 b and the fan 34 are provided and a lower space in which the compressors 1 a and 1 b are provided are partitioned by a partition plate 39. As shown in the figure, the partition plate 39 is provided so as to cover the upper surface side and the front surface side of the compressors 1a and 1b. That is, the compressor chamber 32 of the compressors 1a and 1b is defined by the base 6, the partition plate 39, the partition plate 37, and the front and rear walls and side walls of the box-type cabinet 31a. In particular, the compressors 1a and 1b are formed to have a cylindrical outer shell, and are arranged side by side in the box-type cabinet 31a as shown in FIG. ing.

  The evaporators 4a and 4b are divided into two upper and lower stages, or have two refrigerant circuits arranged in a mixed manner. For example, the evaporators 4a and 4b are formed of so-called cross fin tube heat exchangers in which heat transfer tubes constituting a refrigerant circuit are arranged in a meandering manner and a plurality of fins are attached to the heat transfer tubes. Further, as shown in FIG. 11, the evaporators 4a and 4b are formed as L-shaped bent and outer shells of the heat pump water heater 31 so as to form most of one side and the back of the box-shaped cabinet 31a. .

  Further, the fan 34 is vertically mounted on mounting legs 43 provided along the evaporators 4a and 4b as shown in FIG. The fan 34 takes in air from the outside of the box-type cabinet 31a and blows it out to the front side of the hot water supply device body 31 to forcibly evaporate the low-temperature and low-pressure refrigerant in the evaporators 4a and 4b.

  The electrical product box 35 forms the upper surface of the box-type cabinet 31a, and the electrical product box 35 contains a control circuit for controlling the operation of the compressors 1a and 1b and the fan 34. The second electrical box 41 is disposed on the front surface of the box-type cabinet 31a, and the electrical box 41 has a heat pump hot water supply circuit in accordance with operation settings of the remote controller of the heat pump water heater 31 and detection values of each sensor. A control circuit for stopping the operation is stored.

  The water-refrigerant heat exchanger 2 is formed by winding the refrigerant side heat transfer tubes 2a, 2b and the water supply side heat transfer tubes 2c, 2d around the outer periphery of the hot water storage tank 8 as shown. For example, the refrigerant side heat transfer tubes 2a and 2b are alternately formed in a coil shape, and the water supply side heat transfer tubes 2c and 2d are wound around these overlapping portions, and are formed by thermally firmly joining them by brazing or the like. ing. The upper ends of the refrigerant side heat transfer tubes 2a and 2b are connected to the discharge sides of the compressors 1a and 1b via pipes, and the lower ends of the evaporators 4a and 4b are connected via pipes, expansion valves, and pipes. Connected to one end. The other ends of the evaporators 4a and 4b are connected to the suction sides of the compressors 1a and 1b via pipes.

  Next, referring to FIG. 14, detection of hot water temperature (heat amount) heated by the water refrigerant heat exchanger 2 and stored in the hot water storage tank 8 will be described.

  It is a temperature sensor, for example, a tank thermistor, that manages the hot water temperature stored in the hot water storage tank 8. The tank thermistors 8 a, 8 b, and 8 c are attached to the upper, middle, and lower surface positions of the hot water storage tank 8. The upper and lower tank thermistors 8a and 8c are attached to face the space where the water / refrigerant heat exchanger 2 is not wound up.

  The surface of the hot water storage tank 8 is covered with a heat insulating material 44, and the tank thermistors 8a and 8c are attached to a window or the like. The heat insulating material 44 has an opening at a position where the tank thermistors 8 a and 8 c can be directly attached to the surface of the hot water storage tank 8. The tank thermistor 8 b is attached to the center of the vertical hot water storage tank 8.

  Of course, the water / refrigerant heat exchanger 2 is provided on the surface of the central portion of the hot water storage tank 8 via a heat insulating material 44. The deforming portion 46 is provided at substantially the center of the water-refrigerant heat exchanger 2.

  The deforming portion 46 is a form in which the winding pitch of the heat transfer tubes 2a, 2b, 2c, and 2d constituting the water-refrigerant heat exchanger is partially expanded and the winding diameter is partially increased to protrude from other portions. Is provided.

  As shown in the figure, it is configured such that a substantially triangular shape is formed, a finger is placed on the surface side of the hot water storage tank 8 from this triangle, and a temperature sensor can be attached to the surface of the hot water storage tank 8.

  The heat insulating material 44 corresponding to the deformed portion 46 is provided with a notch window 45. When the heat insulating cover 44 b in the notched window 45 is removed from the deformable portion 46, a finger is inserted and the tank thermistor 8 b is attached to or detached from the hot water storage tank 8. I can do it. Of course, the cutout window 45 is closed with a heat insulating lid 44b except during work.

  The deformed portion 46, which is made by partially expanding the refrigerant-side heat transfer tube and the water supply-side heat transfer tube that are in thermal contact with each other, faces the corner of the rectangular cabinet that forms the outer shell of the water heater main body 31. . In other words, the deforming portion 46 is located in the invalid space of the hot water supply apparatus main body 31.

  Further, as shown in FIG. 15, the water-refrigerant heat exchanger 2 has a shape wound from the upper part to the lower part of the hot water storage tank 8 via the heat insulating material 44, so that the refrigerant side heat transfer tubes 2a and 2b, the water supply side heat transfer tube Even 2c and 2d are very long.

  For this reason, the winding work becomes a large scale as well as a very heavy weight, and the manual work becomes difficult.

  For this reason, the water-refrigerant heat exchanger 2 may be divided into upper and lower parts, and these may be connected by the previous deforming portion 46. This structure not only solves the problem that the water refrigerant heat exchanger 2 with the longer heat transfer tube is too heavy before the assembly of the device, but also welds the heat transfer tubes of the two water refrigerant heat exchangers 2 together. However, the hot water storage tank 8, the heat insulating material 44 and the like are not affected by heat.

  The interval holding pipe 47 does not have a length that extends over the front circumference of the hot water storage tank 8, and is, for example, a pipe having a length that is half or 2/3 of the circumference.

  The pipe 47 is disposed at a position where the winding pitch at the center of the water refrigerant heat exchanger 2 is widened, and the water refrigerant heat exchanger 2 is disposed so as not to be displaced.

  In other words, the deforming portion 46 is provided where the pipe 47 is inserted. That is, since this pipe 47 is not long enough to be wound around the entire circumference, a portion without the pipe 47 can be formed by half or 1/3. The pipe deforming portion 46 can be disposed in a portion where the pipe 47 is not present.

  Thereby, a finger can be put into the hot water storage tank 8 side from the deformable portion 46, and the tank sensor 8b can be detached. Of course, at this time, the heat insulating lid 44b in the cutout window 45 is removed in advance.

  Next, in FIGS. 16 and 17, the heat exchanger pipe 48 is a combination of the refrigerant side heat transfer tube and the water supply side heat transfer tube. As shown in FIG. 16, in order to produce the deformed portion 46, a two-stage pipe 48 is partially protruded outward as shown in the figure, and the deformed portion 46 is provided.

  In this case, the previous interval holding pipe 47 is not required. Further, a temperature sensor (tank sensor 8b) can be attached to the hot water storage tank 8 by inserting a finger through the opening formed by the dimension L1 as indicated by the arrow P1.

  The dimension L1 is selected so that the temperature sensor can be easily attached and detached.

  FIG. 17 shows a deformed portion 46 in which the winding pitch of the pipe 48 is partially enlarged and a part of the pipe 48 is protruded outward.

  In FIG. 17, the interval holding pipe 47 described above is required. The diameter or length of the pipe 48 of the spacing pipe 47 is variable depending on the size of the dimension L1. The attachment / detachment of the temperature sensor (tank sensor 8b) in FIG. 17 to the tank 8 is performed with the heat insulating lid 44b removed from the arrow P1, as in FIG. Naturally, the selection of the L1 dimension is the same as in FIG.

  By configuring as described above, it is possible to easily check the service of the tank sensors 8a, 8b and 8c as well as to assemble, as well as accurately check the amount of hot water in the hot water storage tank 8, and give an accurate operation instruction. It can be done.

  That is, the upper tank sensor 8a detects whether or not the hot water in the hot water storage tank 8 has run out, and determines whether or not the temperature in the hot water storage tank is appropriate.

  The intermediate tank sensor 8b determines how much hot water remains in the hot water storage tank 8 and whether the temperature is appropriate. In other words, it is used as a trigger for boiling back.

  The lower tank sensor 8c is used to determine whether the boil-back is completed and the temperature of the hot water in the lower tank is appropriate.

  In the hot water supply apparatus main body 31 having such a configuration, for example, when hot water storage operation is started, the hot water supply mixing valve 12 opens the hot water storage tank 8 side from the water / refrigerant heat exchanger 2 side in the hot water storage circuit together with the heat pump operation shown in FIG. And the hot water mixing valve 13 side is closed, and the hot water open / close valve 25 is closed. Further, the operation of the in-machine circulation pump 9 is started, and water flows from the water inlet at the lower part of the hot water storage tank 8 to the in-machine circulation pump 9, the hydrothermal water exchange amount sensor 11, the water refrigerant heat exchanger 2, the hot water supply mixing valve 12, and the hot water storage tank 8. Circulate. As a result, when the hot water heated by the water-refrigerant heat exchanger 2 is stored from the upper part of the hot water storage tank 8 and reaches the state where the entire hot water storage tank 8 has boiled, it is determined that the hot water storage is complete, and the operation is stopped. . At this time, the tank sensors 8a, 8b, and 8c perform the above-described functions.

  Since the present embodiment has the configuration as described above, the following effects can be obtained.

  That is, the refrigerant side heat transfer tube and the water supply side heat transfer tube constituting the water refrigerant heat exchanger of the heat pump cycle are brought into thermal contact with each other, wound spirally around the cylindrical hot water storage tank, and heated by the water refrigerant heat exchanger. In a heat pump hot water supply apparatus for storing hot water in the hot water storage tank and detecting the amount of hot water stored by a temperature sensor attached to the surface of the hot water storage tank, the refrigerant side heat transfer tube wound spirally, Because the water supply side heat transfer tube is provided with a winding deformation part in which the distance from the hot water storage tank partially spreads outward, and by using this winding deformation part, a temperature sensor can be attached from the outside to the hot water storage tank surface. A hot water storage tank in which both pipes are wound, such as the temperature at the center or the like, can be accurately measured. Further, even when the temperature sensor is replaced for service or the like, this can be easily performed.

  In addition, a notch window is formed in the heat insulating material corresponding to the winding deformation portion of the refrigerant side heat transfer tube and the water supply side heat transfer tube, and the temperature sensor is detachably attached to the surface of the hot water tank through the notch window. Even if a heat insulating material covering the tank surface is interposed, the hot water storage tank surface temperature can be measured through the heat insulating material.

  In addition, the gap between the deformed portion formed by partially expanding the refrigerant-side heat transfer tube and the water supply-side heat transfer tube that are wound at an equal pitch in a spiral shape is a clearance that allows a temperature sensor attached to the hot water storage tank surface to be easily attached and detached. Therefore, the worker at the time of assembly or service can easily attach and detach the temperature sensor with his / her hand using the gap formed by the pitch expansion and pipe deformation.

  In addition, the position of the deformed portion formed by partially extending the refrigerant side heat transfer tube and the water supply side heat transfer tube that are in thermal contact with each other is opposed to the corner of the rectangular cabinet that forms the outline of the hot water supply device body. Therefore, the deformable portion can be accommodated without expanding the outer shape of the hot water supply apparatus.

  In addition, an interval holding pipe that holds the enlarged dimension is interposed between the winding pitch enlarged portions of the water-refrigerant heat exchanger composed of the refrigerant-side heat transfer tube and the water-supply-side heat transfer tube that are in thermal contact with each other in the vertical hot water storage tank. Because the pipes that were wound do not shrink the enlarged part with their own weight, the deformed part is always kept in a fixed shape, and the temperature sensor can be easily attached and detached through the deformed part. It can be done.

  In addition, when attaching a plurality of temperature sensors to the hot water storage tank arranged vertically, the upper and lower temperature sensors are located where the refrigerant side heat transfer pipe and the water supply side heat transfer pipe are not wound, and an intermediate temperature sensor. Since the winding pitch of both pipes is expanded and the pipes are partially attached to the deformed part, the hot water volume (heat amount) of the hot water storage tank can be accurately measured, and it is always in automatic operation. A predetermined amount of hot water can be secured in the hot water storage tank.

  In addition, since the refrigerant side heat transfer tubes and the water supply side heat transfer tubes of the two sets of heat pump cycles are in heat contact with each other and wound around the hot water storage tank via a heat insulating material, the hot water storage tank can be downsized. Of course, the water supply side heat transfer pipe temperature can be raised to a predetermined temperature in a short time.

  In addition, the water heat exchanger wound around the hot water storage tank is constituted by the first and second water heat exchangers in advance, and the distance from the hot water storage tank is partially expanded at the connecting portion of the first and second water heat exchangers. Because it is a winding deformation part, in order to use the connection pipe for the connection between the water and refrigerant heat exchanger pipes, the pipe diameter is different from the front and rear pipe diameters, but the part where the pipe diameter is different is spread outside the outer circumference winding of the hot water storage tank Therefore, the other portions can be wound with the same pitch and the same diameter.

  In addition, since welding is performed away from the tank, it can be easily performed, so that it is not necessary to use a long pipe. For this reason, productivity is also improved.

It is a schematic diagram which shows one Example of schematic structure of the heat pump refrigerant circuit, the hot water supply circuit, the operation control means, and components in the heat pump hot water supply apparatus of this invention. It is a flowchart which shows the confirmation operation | movement at the time of installation and piping connection in the heat pump hot-water supply apparatus which is one Example of this invention. It is a flowchart which shows the operation | movement at the time of the hot water storage driving | operation in the heat pump hot-water supply apparatus which is one Example of this invention. It is a flowchart which shows the operation | movement at the time of hot water use in the heat pump hot-water supply apparatus which is one Example of this invention. It is a flowchart which shows the operation | movement at the time of bath hot water filling in bath automatic operation. It is a flowchart which shows the operation | movement at the time of bath heat retention in bath automatic operation. It is a diagram which shows an example of the relationship between the temperature difference of the heating side fluid of a heat exchanger for baths, and bathtub water, and a heating efficiency. It is a diagram which shows a bath chase time progress, the temperature change of a bath water, and the temperature setting value of a heating side fluid when the remaining hot water of a bathtub cools a little. It is a diagram which shows the bath chasing time progress, the temperature change of a bath water, and the temperature setting value of a heating side fluid when the remaining hot water of a bathtub cools considerably like the chasing operation of the next day. It is a schematic diagram of a schematic configuration of a heat pump refrigerant circuit, a hot water supply circuit, operation control means, and parts in a heat pump hot water supply apparatus that is another embodiment of the present invention. It is the front view of the heat pump hot-water supply apparatus of this embodiment, and is the figure which removed the front plate. It is a side view of FIG. FIG. 12 is a top view of FIG. 11. It is the A section enlarged view of FIG. FIG. 13 is an enlarged front view of a water refrigerant heat exchanger pipe and a water supply side heat transfer pipe used in FIG. 12. It is explanatory drawing of the deformation | transformation part shown in FIG. It is a figure explaining the Example different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b ... Compressor 1c, 1d ... Pressure sensor 2 ... Water-refrigerant heat exchanger 2a, 2b ... Refrigerant side heat transfer pipe 2c, 2d ... Water supply side heat transfer pipe 2e ... Thermal exchange sancer 3a, 3b ... Pressure reducing device 4a, 4b ... Evaporator 5 ... Water supply fitting 6 ... Pressure reducing valve 7 ... Water supply water amount sensor 7a ... Water supply thermistor 8 ... Hot water storage tank 8a, 8b, 8c, 8d ... Tank thermistor 9 ... In-machine circulation pump 10 ... Water supply check valve 11 ... Water heat water exchange amount Sensor 12 ... Hot water mixing valve 13 ... Hot water mixing valve 14 ... Flow rate adjusting valve 14a ... Hot water thermistor 15 ... Kitchen tap metal 16 ... Kitchen faucet 17 ... Bath pouring valve 18 ... Flow switch 18a ... Bath thermistor 19 ... Bath circulation pump 20 ... Bathtub metal fitting 21 ... Bath circulation adapter 22 ... Bathtub 22a ... Water level sensor 23 ... Bath heat exchanger 23b ... Bath water heat transfer tube 23 ... bath water heat transfer pipe 24 ... bath outlet metal fitting 25 ... hot water on / off valve 26 ... bath faucet 27 ... relief valve 28 ... refrigerant on / off valve 30 ... heat pump refrigerant circuit 31 ... hot water supply body 31a ... box cabinet 32 ... compressor room 33 ... Evaporator chamber 34 ... Fan 35 ... Electrical box 36 ... Hot storage tank chamber 37 ... Division plate 38 ... Base 39 ... Partition plate 40 ... Hot water supply circuit 41 ... Second electric box 42 ... Leg 43 ... Mounting leg 44 ... Heat insulation Material 44b ... Insulation cover 45 ... Notch window 46 ... Deformation part 47 ... Spacing pipe 48 ... Heat exchange pipe 49 ... Dew receptacle 50 ... Operation control means.

Claims (8)

The water-refrigerant heat exchanger of the heat pump cycle is provided in such a manner that the refrigerant-side heat transfer tube and the water supply-side heat transfer tube are in thermal contact with each other, arranged in a spiral shape on the outer periphery of the cylindrical hot water storage tank, and water-refrigerant heat exchange In the heat pump hot water supply apparatus, the heated hot water is stored in the hot water storage tank by a heater, and the stored hot water amount is detected by a temperature sensor attached to the surface of the hot water storage tank. The side heat transfer pipe and the water supply side heat transfer pipe are provided with a winding deformation part that partially extends outward from the hot water storage tank in a part in the cylindrical axial direction and a part in the circumferential direction. The heat pump hot water supply apparatus is characterized in that the temperature sensor can be attached to the surface of the hot water storage tank from the outside. A heat insulating material is provided so as to cover the surface of the hot water storage tank, and the water refrigerant heat exchanger is disposed on the outer periphery of the hot water storage tank via the heat insulating material,
2. A notch window is provided in a heat insulating material corresponding to a winding deformation portion of the refrigerant side heat transfer tube and the water supply side heat transfer tube, and a temperature sensor is provided on the surface of the hot water storage tank facing the notch window. Heat pump water heater. The gap between the winding deformation part in which the refrigerant side heat transfer pipe and the water supply side heat transfer pipe, which are wound up at a regular pitch in a spiral shape, are partially expanded is a gap where a temperature sensor attached to the surface of the hot water storage tank can be easily attached and detached. The heat pump hot water supply apparatus according to claim 1, wherein The position of the winding deformation portion where the refrigerant side heat transfer tube and the water supply side heat transfer tube partially spread outward is opposed to a corner portion of a rectangular cabinet that constitutes the outline of the water heater main body. The heat pump hot water supply apparatus according to claim 1. By winding the refrigerant side heat transfer tube and the water supply side heat transfer tube so that the winding pitch is larger than other portions in the winding deformation portion, a winding pitch expansion portion is formed,
The heat pump hot water supply apparatus according to claim 1 , wherein an interval holding pipe for holding an interval between the refrigerant side heat transfer tubes and the water supply side heat transfer tubes is interposed in the winding pitch expanding portion . A plurality of temperature sensors are provided in a hot water storage tank arranged in a vertical shape, and the upper and lower temperature sensors are provided in a portion where the refrigerant side heat transfer pipe and the water supply side heat transfer pipe are not wound. The heat pump hot-water supply apparatus according to claim 1, wherein the sensor is provided at a position corresponding to the winding deformation portion.   The heat pump hot water supply device according to claim 1, wherein the refrigerant side heat transfer tubes and the water supply side heat transfer tubes of the two sets of heat pump cycles are in heat exchange contact with each other and provided on the outer peripheral portion of the hot water storage tank via a heat insulating material. . As before Symbol water refrigerant heat exchanger, the first placed at different positions in the hot water storage tank, the provided second coolant-refrigerant heat exchanger, these first and second coolant-refrigerant heat exchanger to each other, their connection portions There the hot water storage tank by connecting so as to spread outward, the heat pump water heater according to claim 1, wherein the said connecting portion and said winding deformation portion.

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