JP2007155257A - Heat pump water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump water heater with improved installing performance having excellent usability and maintainability by reducing the size of a device body by optimally arranging components thereinside in a heat pump water heater having a refrigerating cycle and a water heating cycle integrally accommodated inside one main body unit. <P>SOLUTION: The heat pump water heater has a refrigerant cycle 2 connecting a compressor 4, an air-refrigerant heat exchanger 7, a condenser 5, and a pressure reducing means 6, and has a water storage tank 11 connected to a water-refrigerant heat exchanger 10 for heat exchanging with the condenser 5 for storing hot water heated by the water-refrigerant heat exchanger 10 integrally accommodated in the main body unit 1. A protrusion part 46 toward the rear is provided on a box body in the rear of the water storage tank 11 of the main body unit 1. An air-refrigerant heat exchanging inlet pipe 42 connected to an air-refrigerant heat exchanger 14, and an air-refrigerant heat exchanging outlet pipe 43 connected to the compressor 4 for sending the refrigerant heat-exchanged in the air-refrigerant heat exchanger 7 are accommodated in the protrusion part 46. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat pump type water heater.

  Conventionally, hot water heaters that use gas or petroleum as fuel and heat tap water with the combustion heat have been used as hot water heaters. While these have the advantage of being excellent in quick hot water properties, fuels such as gas and oil are necessary and the supply thereof is indispensable, exhaust gas after combustion is released into the atmosphere, causing air pollution, and burning Therefore, there were problems such as being always unsafe and having a loud noise during combustion. Especially in all-electric houses and condominiums where all energy sources are electricity, which has been increasing in recent years, there is no way to supply fuel, so there are more cases where it cannot be used.

  Accordingly, a hot water storage type heat pump type hot water heater equipped with a hot water storage tank has been developed. This solves the problem of hot water heaters due to combustion, and can be installed easily in all-electric homes and condominiums without the need for new infrastructure development. It is possible to ensure high thermal efficiency, and it is possible to store hot water in a hot water storage tank using inexpensive late-night power for operation, and it has the feature that running costs are also low, and it gradually spreads Have been doing.

  As such a water heater, there is a heat pump type water heater as shown below. As shown in FIG. 7, the heat pump type hot water heater includes a hot water supply cycle 71 and a refrigerant cycle 72, which are separate main body units. Two boxes of a hot water storage unit including a hot water supply cycle 71 and a heat pump unit including a refrigerant cycle 72 are provided. This hot water supply cycle 71 includes a hot water storage tank 75 having a hot water supply port 73 provided on the bottom wall and a hot water supply port 74 provided on the upper wall, a water heat exchange path 76, and a water circulation pump 77, and performs water heat exchange. A passage 76 and a water circulation pump 77 are provided in a circulation passage 80 that connects a water intake 78 and a hot water inlet 79 of the hot water storage tank 75.

  The refrigerant cycle 72 is configured by connecting a compressor 81, a water heat exchanger 82 constituting a heat exchange path 76, a decompression mechanism 83, and an evaporator 84 as an air heat exchanger in order through a refrigerant path 85. A refrigerant cycle is provided. Furthermore, the hot water supply cycle 71 and the refrigerant cycle 72 are connected by connecting pipes 86 and 87 disposed on the outdoor side. Then, the low-temperature water supplied from the water supply port 73 and discharged to the circulation path 78 by the water circulation pump 77 is boiled by the water heat exchanger 82 (that is, the water heat exchange path 76) and discharged from the hot water supply port 74. (For example, refer to Patent Document 1).

  The heat pump water heater operates an energy efficient refrigerant cycle (heat pump circuit) 72 using inexpensive electric power at night, and circulates water in the hot water storage tank 75 with a water flow pump 77 while performing water heat. The exchanger 82 is warmed up to a predetermined hot water temperature, detects that the predetermined hot water temperature has been reached, and stops the operation of the refrigerant cycle 72. When hot water is used at the normal hot water supply port 74, it is mixed with tap water having a temperature lower than the hot water temperature in the hot water storage tank 75 to obtain an appropriate temperature desired by the user. The temperature of the hot water stored in the hot water storage tank 75 should be as high as possible, thereby increasing the amount of tap water added to lower the temperature and reducing the amount of hot water removed from the hot water storage tank 75. It is designed to prevent problems such as cutting.

Among them, an apparatus in which a heat pump unit and a hot water storage unit are integrated has been devised. For example, there is a heat pump water heater shown below. In this case, a hot water supply cycle and a refrigerant cycle are stored in a single box, and a compressor, a radiator, a decompression means, and an evaporator are sequentially connected to form a closed circuit, and a refrigerant cycle for circulating the refrigerant, A tank, a water circulation pump for circulating water in the hot water storage tank, a water-refrigerant heat exchanger for exchanging heat with water circulated by the water circulation pump, a water supply pipe for supplying water to the hot water storage tank, and the hot water storage tank A hot water supply pipe for supplying hot water from the water supply pipe, the water supply pipe is branched and connected to the inlet side of the hot water storage tank and the inlet side of the water heat exchanger, and the hot water supply pipe is connected to the outlet side of the hot water storage tank and the water heat exchange. Branching and connecting to the outlet side of the water heater, provided with a valve for switching between hot water supply from the hot water storage tank and hot water supply from the water heat exchanger, water-refrigerant heat exchange comprising the water heat exchanger and the condenser Wrap the vessel in a spiral In addition to being formed in a cylindrical shape, it is installed so as to surround the hot water storage tank, and the refrigerant cycle and the hot water supply cycle are accommodated in one box (see, for example, Patent Document 2 and Patent Document 3).

  FIG. 8 shows a circuit configuration diagram of such a heat pump water heater.

  The heat pump water heater shown in FIG. 8 is configured as an integrated type in which the refrigerant cycle and the hot water supply cycle are all housed in one unit, and includes a refrigerant cycle 110, a hot water supply cycle 111, a water supply pipe 112, and a hot water supply pipe 113. The pipe 112 is branched and connected to the inlet side of the hot water storage tank 114 and the outlet side of the water-refrigerant heat exchanger 115 to switch between hot water supply from the hot water storage tank 114 and hot water supply from the water-refrigerant heat exchanger 115. 117, the water-refrigerant heat exchanger 115 is spirally wound into a cylindrical shape, and is installed so as to surround the hot water storage tank 114, and the refrigerant cycle 110 and the water circulation circuit 111 are accommodated in one box. It is.

  The refrigerant cycle 110 is connected with a compressor 118, a water-refrigerant heat exchanger 115 as a radiator, a decompression unit 119, and an evaporator 120 in this order to form a closed circuit.

FIG. 9 also shows a configuration diagram of the main body of a heat pump water heater in which the refrigerant cycle and the hot water supply cycle are housed in one box. The compressor 118 is on the lower left of the main body, and the water-refrigerant heat is on the upper side. An evaporator 120 is arranged above the exchanger 115 and the water-refrigerant heat exchanger 115 to constitute a refrigerant cycle 110, and a hot water supply cycle 111 including a hot water storage tank 114 is arranged on the right side of the refrigerant cycle 110. ing.
JP 2003-222392 A JP 2003-314892 A JP 2005-114314 A

  However, in the configuration of Patent Document 1, since the hot water supply cycle and the refrigerant cycle are separated, each is necessary separately, and when each is unitized, the unit size is large and the weight is heavy. However, there was a problem that the installation location was limited. Further, since the connecting pipe is disposed outside the room, freeze waterproofing or the like is necessary, and there are problems in workability and cost.

In addition, assuming the use in a family, the amount of hot water in the tank is required to store 370 L or more of hot water of 65 ° C. or higher, and considering the case where hot water is stored to the full capacity of the hot water storage tank, Since the total weight of the hot water storage unit and heat pump unit exceeds 430 kg, it was necessary to secure sufficient strength by performing foundation work and reinforcement at the installation site. In particular, if it was to be installed on the balcony of a condominium, the load-bearing strength of the balcony had to be increased, and the construction cost of the apartment could be high. Furthermore, two units must be transported when transporting the heat pump water heater to the customer's installation location, which requires a lot of cost and labor. Further, since the connecting pipe is disposed outside the room, freeze waterproofing or the like is necessary, and there are problems in workability and cost.

  Furthermore, since the amount of hot water in the hot water storage tank is limited, the amount of hot water used may increase when many people gather, and the amount of hot water in the hot water storage tank may be lost. However, since it is a product that originally uses midnight power to store hot water over a long time with a small capacity, it takes a considerable amount of time to store hot water. There are problems in usability, such as the lack of merits of using late-night power and the cost of electricity.

  In addition, the heat pump water heater shown in Patent Document 2 and Patent Document 3 is configured as an integrated type in which the refrigerant cycle 110 and the hot water supply cycle 111 are all housed in one unit, and has excellent workability such as few pipe connections. However, if the main body size is emphasized, the size of the hot water storage tank 114 cannot be increased so much that the resistance to hot water shortage is insufficient. For example, when a large amount of hot water is used at one time, After applying hot water (for example, when using a shower), there is a high possibility that the hot water will run out. To prevent this, increasing the size of the hot water storage tank 114 will reduce the body size. This led to an increase in size, and it was supposed to go in a different direction from the original purpose of making it compact as an integrated type.

  In order to avoid this, the fact that the refrigerant cycle 110 side is made small means that the heat pump capacity is reduced, and if the amount of hot water in the hot water storage tank 114 is exhausted, the ability to boil up again will be There was a problem that the boiling could not catch up due to shortage and the water would run out. Had the problem of becoming.

  In order to prevent this, it is now necessary to increase the refrigerant cycle, which increases the size of the main body.

  As such, it was very difficult to install the condominium on the veranda and the like, and it was not always possible to demonstrate the benefits of the integrated type.

  In addition, although the refrigerant cycle and hot water supply cycle are all integrated into a single unit, the size of the unit includes a large refrigerant cycle part and a tank unit part. At that time, the refrigerant could not be removed locally, so the entire device integrated with the hot water tank unit had to be taken back to the factory, which was very poorly maintainable.

  Therefore, the present invention solves such a conventional problem, and in an integrated heat pump water heater in which a refrigerant cycle and a hot water supply cycle are housed in one main body unit, the device main body dimensions are optimized for the components inside the device. It aims at providing the heat pump water heater excellent in the installability improvement, usability, and maintainability by downsizing by arrangement.

In order to solve the above-described conventional problems, a heat pump water heater of the present invention is a refrigerant cycle in which a compressor, a radiator, a decompression unit, and an air-refrigerant heat exchanger are sequentially connected to form a closed circuit and the refrigerant is circulated. A water-refrigerant heat exchanger that performs heat exchange with the radiator, a hot water storage tank that stores hot water heated by the water-refrigerant heat exchanger, and a housing that stores the components, The housing has a protruding portion protruding outward, and a refrigerant pipe connected to the air-refrigerant heat exchanger and a part of the hot water storage tank are disposed in the protruding portion, It is possible to increase the capacity of the hot water storage tank while reducing the size of the main body of the device, so that hot water does not run out during actual use, and the water heater can be easily used. In addition, since the refrigerant pipe connected to the air-refrigerant heat exchanger protrudes outward from the main body, it can be easily confirmed by removing the housing, thereby improving maintainability. It is possible to provide a heat pump water heater with high usability and maintainability.

  ADVANTAGE OF THE INVENTION According to this invention, the heat pump water heater excellent in the installability improvement, usability, and maintainability can be provided by reducing the apparatus main body dimension by the optimal arrangement | positioning of the components inside an apparatus.

  A first aspect of the present invention is a refrigerant cycle in which a compressor, a radiator, a pressure reducing means, and an air-refrigerant heat exchanger are sequentially connected to form a closed circuit and the refrigerant is circulated, and water that exchanges heat with the radiator. A refrigerant heat exchanger, a hot water storage tank connected to the water-refrigerant heat exchanger and storing hot water heated by the water-refrigerant heat exchanger, an inlet pipe for supplying tap water, and heated hot water A heat pump water heater having a hot water supply pipe connected so as to pass water to a hot water supply terminal and having an integrated housing, provided with a protruding portion projecting outward on the back surface of the housing, and the air- It is characterized by the fact that a refrigerant pipe connected to the refrigerant heat exchanger is provided, and it is possible to increase the capacity of the hot water storage tank while reducing the size of the main body of the equipment, so that hot water runs out during actual use. It will not occur and can be a convenient water heater. That. In addition, since the refrigerant pipe connected to the air-refrigerant heat exchanger protrudes outward from the main body, it can be easily confirmed by removing the housing, thereby improving maintainability. It is possible to provide a heat pump water heater with high usability and maintainability.

  Moreover, even if the hot water storage tank is made larger by placing a part of the hot water storage tank in the side of the refrigerant pipe connected to the air-refrigerant heat exchanger in the protruding portion, the refrigerant piping will not come into contact. The hot water storage tank can be made as large as possible while maintaining the body size compact, and the heat pump water resistance can be improved and the heat pump water heater excellent in usability can be obtained. As a result, the main body is made compact, the capacity of the hot water storage tank is increased, the size of the refrigerant cycle can be sufficiently secured, the hot water resistance can be improved, and the usability is high. In addition, it can be an excellent heat pump water heater.

  According to a second aspect of the present invention, in the heat pump water heater of the first aspect, a soundproof material is provided on the inner wall of the projecting portion at the facing portion of the refrigerant pipe connected to the air-refrigerant heat exchanger. Thus, noise reduction can be achieved. In particular, the protruding portion has a drum shape and is easy to resonate. On the other hand, by attaching a soundproof material, resonance can be prevented and sound leakage to the rear can be prevented, and a silent heat pump water heater can be obtained.

  The third invention is characterized in that, in the heat pump water heater of the first or second invention, the protrusion dimension of the protrusion is 50 mm or more and 150 mm or less, and does not affect the heat pump capacity when installed. By setting the minimum dimension, it is possible to reduce the installation space while securing a sufficient heat pump capability, and a heat pump water heater can be obtained.

  According to a fourth aspect of the present invention, in the heat pump water heater according to any one of the first to third aspects, the refrigerant inlet side pipe to the air-refrigerant heat exchanger is arranged on the inner wall side of the housing rather than the refrigerant outlet side pipe. The heat pump capacity can be improved by making the air flow parallel to the air flow, and a heat pump water heater excellent in usability can be obtained.

According to a fifth aspect of the present invention, in the heat pump water heater of any one of the first to seventh aspects, the refrigerant pipe connected to the air-refrigerant heat exchanger includes a branch pipe provided in the refrigerant inlet side pipe and a refrigerant outlet. It has a header pipe provided on the side pipe, and is arranged in the branch pipe, the header pipe and the protruding portion, and even if the hot water storage tank is enlarged, the refrigerant pipe does not come into contact, While keeping the main body size compact, the hot water storage tank can be made as large as possible, the hot water resistance can be improved, and a heat pump water heater excellent in usability can be obtained.

  A sixth invention is the heat pump water heater according to any one of the first to fifth inventions, wherein a highly compressible heat insulating material is disposed on the outer periphery of the hot water storage tank, and the outer peripheral portion and the protruding portion of the high compressible heat insulating material are arranged. This is characterized by a gap between the inner wall and the tank, so that the amount of tank movement can be minimized even when a lateral load is applied to the equipment during transportation or installation. This makes it possible to suppress the occurrence of dents and scratches on the exterior, and because it has a configuration in which a heat insulating material is interposed between the protruding portion and the hot water storage tank, it can be placed horizontally on the equipment during transportation and installation. Even when a load in the direction is applied, this heat insulating material has a role as a cushioning material, making it possible to suppress the occurrence of dents and scratches on the exterior, and to make a heat pump water heater excellent in workability Can do.

  A seventh invention is a heat pump water heater according to any one of the first to sixth inventions, wherein carbon dioxide is used as a refrigerant, and the thermal efficiency at the time of high-temperature hot water supply is increased and the refrigerant leaks to the outside. However, the impact on global warming can be greatly reduced compared to the R-410A refrigerant used in general air conditioners, and it is an environmentally friendly heat pump water heater with excellent recyclability. be able to.

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

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

  1 is a circuit configuration diagram of the present invention, FIG. 2 is a top view of a heat pump water heater, FIG. 3 is a front view, FIG. 4 is a side view, and FIG. 5 is a top view.

  As shown in FIG. 1, the heat pump water heater of the present embodiment is configured by integrally storing a refrigerant cycle 2 and a hot water supply cycle 3 in a main unit 1.

  The refrigerant cycle 2 includes a compressor 4 disposed inside the main unit 1, a radiator 5, a decompression means 6 made of, for example, an electric expansion valve, and an L-shaped air-refrigerant heat exchanger 7. 8 is connected. In addition, a blower fan 9 is provided to apply air to the air-refrigerant heat exchanger 7 to increase the evaporation capability.

  On the other hand, the hot water supply circuit is a water-refrigerant heat exchanger 10 that exchanges heat with the radiator 5 to change tap water or the like into warm water (for example, a heat exchanger having a double tube structure integrated with the radiator 5). ), A hot water storage tank 11 for storing hot water obtained by the water-refrigerant heat exchanger 10, a hot water storage tank 11 and a water-refrigerant heat exchanger 10, a water inlet pipe 12 for entering tap water, a hot water storage tank 11 and water- The hot water supply pipe 14 supplies hot water from the refrigerant heat exchanger 10 to the hot water supply terminals of the faucet 13a and the shower 13b, and the hot water supply circulating water pump 15 supplies low temperature water in the hot water storage tank 11.

  Further, the configuration of the hot water supply circuit will be described.

The tank inlet pipe 16 is a pipe that sends tap water from the inlet pipe 12 to the hot water storage tank 11, and a tank inlet check valve 17 is provided on the way. The tap water supply pipe 18 is a pipe that directly supplies tap water from the inlet pipe 12 to the radiator 5 (water-refrigerant heat exchanger 10), and a check valve 19 is provided in the tap water supply pipe 18. . The heat exchange water supply pipe 20 is a pipe that sends low temperature water stored in the hot water storage tank 11 downward from the hot water storage tank 11 to the water-refrigerant heat exchanger 10 by the operation of the hot water supply circulation water pump 15. , A pipe for sending tap water heated by the water-refrigerant heat exchanger 10 to the hot water storage tank 11 and the original mixing valve 22. A hot water storage three-way valve 23 is provided in the middle of the hot water storage tank side pipe 21 a and the original mixing valve side. A check valve A24 is provided in the middle of the pipe 21b.

  The tank hot water supply pipe 25 is a pipe for supplying hot water (usually 60 ° C. to 90 ° C.) from the hot water storage tank 11 to the original mixing valve 22, and the original mixing valve 22 is connected to the hot water storage pipe 21 (original mixing valve side pipe). 21b) and a hot water or water coming from the tank hot water supply pipe 25, and the check valve A24 is a valve provided in front of the original mixing valve 22. The hot water supply mixing valve 26 is a valve that mixes hot water that has passed through the original mixing valve 22 and tap water supplied from the inlet pipe 12, obtains an appropriate hot water supply temperature, and supplies the hot water to the faucet 13a and the shower 13b. Between the hot water supply mixing valve 26 and the inlet pipe 12, check valves B26a and 26b for preventing backflow are provided.

  And the hot water which became the optimal temperature in the hot water supply mixing valve 26 is supplied to the faucet 13a and the shower 13b through the hot water supply pipe 14.

  27 is a bath pouring mixing valve, which mixes hot water that has passed through the original mixing valve 22 and tap water supplied from the inlet pipe 12 to obtain an appropriate hot water supply temperature and pour water into the bath 28. Yes, a check valve C27b for preventing backflow is provided between the bath pouring mixing valve 27 and the inlet pipe 12. The hot water that has reached the optimum temperature in the bath pouring mixing valve 27 passes through the bath pouring pipe 29, passes through the backflow prevention valve 29a, is poured into the bath 28, and hot water is poured into the bath.

  Reference numeral 30 denotes a bath heat exchanger which passes when hot water is directed from the bath pouring mixing valve 27 to the bath 28. The bath heat exchanger 30 is a heat exchanger that is used when additionally preparing hot water in the bath 28. Hot water is drawn from the bath by the bath circulating water pump 32 from the bath 28 through the bathtub outlet pipe 31b. Heat exchange between hot water and hot water in the hot water storage tank 11 drawn from the hot water storage tank 11 by the additional pump 33 and returning to the bath by the bathtub hot water pipe 31a allows the temperature of the bath 28 to be kept constant. Even if the amount of hot water in the bath 28 is not increased, the additional cooking operation for raising the hot water temperature is performed. That is, the bath heat exchanger 30 is a water-water heat exchanger.

  Reference numeral 34 denotes an incoming water flow meter, which is an instrument that measures the incoming water flow rate, and a hot water supply flow meter 35 is an instrument that measures the hot water flow rate. The drain valve 36 is a valve used for draining water in the tank to prevent freezing or the like when it is not used for a long time in a cold region or the like, and the control valve 37 is a valve for controlling the incoming water flow rate. 38 a is a pressure relief valve for the hot water storage tank 11, and 38 b is a can protection valve for the hot water storage tank 11.

  Further, the control device 39 detects the refrigerant temperature on the high pressure side of the refrigerant cycle 2, determines the rising state of the refrigerant cycle based on the temperature level, and controls the original mixing valve 22, the hot water mixing valve 26, and the bath pouring mixing valve 27. It is a means to control the opening degree.

  A configuration in which these components are arranged in the main unit 1 is shown in the interior views of FIGS. 1, 2, and 3. Next, the arrangement configuration of each element will be described using these components.

  FIG. 2 shows a top view, and the numbers given in FIG. 2 are the same as those in FIG.

  A main body unit 1 surrounded by a casing is configured by integrally storing a refrigerant cycle 2 and a hot water supply cycle 3. The refrigerant cycle 2 is mainly located on the left side of the main body unit 1, and the hot water supply cycle 3 is a main body unit. 1 is disposed substantially to the right.

  In the refrigerant cycle 2, a compressor 4, a radiator 5, a decompression unit 6, and an air-refrigerant heat exchanger 7 are sequentially connected to form a closed circuit, and a vertical circuit is formed on a substrate 40 at the bottom of the main unit 1. A stationary compressor 4 and a radiator 5 are placed. In addition, an electric expansion valve 6 that is a pressure reducing means is disposed in front of the compressor 4, and the compressor 4, the radiator 5, and the expansion valve 6 are disposed at the lower left side of the main unit 1. . Above the radiator 5, there is an intermediate substrate 41 that is substantially L-shaped when viewed from above and is wide at the rear, and is provided with a certain gap from the substrate 40.

  A substantially L-shaped air-refrigerant heat exchanger 7 is placed above the intermediate substrate 41 in the same manner as the intermediate substrate. The compressor 4, the radiator 5, the expansion valve 6, and the air constituting the refrigerant cycle 2 are mounted. The refrigerant heat exchanger 7 is connected by a refrigerant pipe 8. On the upper right side of the air-refrigerant heat exchanger 7, the expansion valve 6 is connected to the air-refrigerant heat inlet pipe 42 through which the refrigerant flows and the compressor 4. An air-refrigerant heat exchange outlet pipe 43 for sending the exchanged refrigerant to the compressor is provided, and the air-refrigerant heat exchange inlet pipe 42 and the air-refrigerant heat exchange outlet pipe 43 are air-refrigerant heat exchange pipes. The shape protrudes outward from the vessel 7. Further, the air-refrigerant heat exchange pipe 42 is connected to the outside with respect to the air-refrigerant heat exchanger 7, and the air-refrigerant heat exchange pipe 43 is connected to the inside. The air-refrigerant heat exchanger 7 is blown by a blower fan 9 to increase the evaporation capacity and the heat pump heating capacity.

  On the right side of the main unit 1, there are provided parts constituting the main hot water supply cycle 3 excluding the radiator 5, and 11 is a hot water storage tank for storing tap water heated by the radiator 5. It is in the shape of a can. The hot water storage tank 11 is disposed outside the air-refrigerant heat exchanger 7 in the same manner as the air-refrigerant heat exchange inlet pipe 42 and the air-refrigerant heat exchange outlet pipe 43. In addition, a highly compressible vacuum heat insulating material 44 (indicated by an oblique lattice) is wound around the outer periphery of the hot water storage tank 11 to improve the heat retention performance of the hot water storage tank 11. A hot water supply circuit 45 constituting the hot water supply cycle 3 is arranged in front of the hot water storage tank 11.

  The air-refrigerant heat exchange inlet pipe 42, the air-refrigerant heat exchange outlet pipe 43, and the hot water storage tank 11 of the main unit 1 are provided with a protruding portion 46 projecting rearwardly. On the other hand, the air-refrigerant heat exchange inlet pipe 42, the air-refrigerant heat exchange outlet pipe 43, and a part of the hot water storage tank 11 are accommodated. Further, a gap is provided so that the heat insulating material 44 wound around the hot water storage tank 11 and the protrusion 46 do not contact each other. In addition, a soundproof material 47 (shown by hatching) is attached to the projecting portion 46 at a portion facing the air-refrigerant heat exchange pipe 42 and the air-refrigerant heat exchange pipe 43.

  FIG. 3 shows a front view, and the numbers given in FIG. 3 are the same as those in FIGS.

  A main body unit 1 surrounded by a casing is configured by integrally storing a refrigerant cycle 2 and a hot water supply cycle 3. The refrigerant cycle 2 is mainly located on the left side of the main body unit 1, and the hot water supply cycle 3 is a main body unit. 1 is disposed substantially to the right.

  On the left side of the main unit 1, a vertically placed compressor 4 and a radiator 5 (water-refrigerant heat exchanger 10) are placed on a substrate 40 at the bottom, which is the refrigerant cycle 2. The compressor 4, the radiator 5, the electric expansion valve 6 that is a decompression unit, and the air-refrigerant heat exchanger 7 are connected in an annular shape to constitute the refrigerant cycle 2. Above the water-refrigerant heat exchanger 10, there is an intermediate substrate 41, and the air-refrigerant heat exchanger 7 is placed on the intermediate substrate 41. In order to support the intermediate substrate 41, there is an intermediate substrate support plate 48 that is substantially L-shaped when viewed from above, and is placed on the substrate 40, and the compressor 4 is disposed inside the approximately L-shape. Has been. A bath circulation water pump 32 is disposed in front of the compressor 4.

  The radiator 5 (water-refrigerant heat exchanger 10) is located outside the intermediate board support plate 48, and performs position regulation and fixing and holding with the side housing 1 a of the main unit 1. The compressor 4 protrudes above the intermediate substrate support plate 49, that is, above the intermediate substrate 41, and the box-shaped compressor cover 49 covers the protruding compressor 4 and the components constituting the refrigerant cycle 2. Is mounted on the intermediate substrate 41. Above the substantially L-shaped intermediate substrate 41, an air-refrigerant heat exchanger 7 constituting the refrigerant cycle 2 is placed, and is also configured in an approximately L shape.

  Inside the air-refrigerant heat exchanger 7, there is a blower fan 9 that is a blowing means. The air-refrigerant heat exchanger 7 is blown to increase the evaporation capacity and the heat pump heating capacity. . 50 is a fan motor for rotating the blower fan 9, 51 is a fan motor base holding the blower fan 9 and the fan motor 50, and this fan motor base 51 is placed on the compressor cover 49. ing. Above the fan motor base 51, there is a control device box 52 incorporating the control device 39, and the fan motor base 51 is sandwiched and supported between the compressor box 49 and the control device box 52. Parts constituting the main hot water supply cycle 3 are provided on the right side of the main unit 1, 11 is a hot water storage tank, and a hot water supply circuit 45 is arranged in front of the hot water storage tank 11.

  Of the hot water supply circuit 45, the water-refrigerant heat exchanger 10 integrated with the radiator 5 is arranged at the lower left, but the other hot water supply circuit 45 is arranged in front of the hot water storage tank 11, The incoming water pipe 12 and the hot water supply pipe 14 are arranged below, and the hot water supply circulating water pump 15 is arranged above the bath circulating water pump 32. Original mixing valve 22, hot water storage three-way valve 23, tank hot water pipe 25, hot water mixing valve 26, bath pouring mixing valve 27, bath pouring pipe 29, bath heat exchanger 30, bath hot water pipe 31a, control valve 37, bath hot water A pipe 31b, a pressure relief valve 38a, and the like are arranged on the upper surface and the front surface of the hot water storage tank 11. Reference numeral 53 denotes a leg of the main unit 1, which is attached to the substrate 40 so as to secure a piping space below.

  FIG. 4 is a side view showing the part of the refrigerant cycle 2, and the numbers given in FIG. 4 are the same as those in FIGS. 1, 2, and 3.

  On the left side in the main unit 1, a vertically mounted compressor 4 and a radiator 5 (water-refrigerant heat exchanger 10) are placed on a base plate 48 at the bottom. A radiator 5, an electric expansion valve 6 that is a decompression unit, and an air-refrigerant heat exchanger 7 are connected in an annular shape to constitute a refrigerant cycle 2. Above the water-refrigerant heat exchanger 10, there is an intermediate substrate 41, and the air-refrigerant heat exchanger 7 is placed on the intermediate substrate 41. The compressor 4 protrudes above the intermediate substrate 41, and a box-shaped compressor cover 50 is placed on the intermediate substrate 41 so as to cover the protruding compressor 4 and the components constituting the refrigerant cycle 2. Has been.

  Inside the air-refrigerant heat exchanger 7, there is a blower fan 9 that is a blowing means. The air-refrigerant heat exchanger 7 is blown to increase the evaporation capacity and the heat pump heating capacity. . 50 is a fan motor for rotating the blower fan 9, 51 is a fan motor base holding the blower fan 9 and the fan motor 50, and this fan motor base 51 is placed on the compressor cover 49. ing. Above the fan motor base 51, there is a control device box 52 incorporating the control device 39, and the fan motor base 51 is sandwiched and supported between the compressor box 49 and the control device box 52.

The air-refrigerant heat exchange inlet pipe 42, the air-refrigerant heat exchange outlet pipe 43, and the hot water storage tank 11 (not shown in the drawing) of the main unit 1 are provided with a protruding portion 46 projecting rearward. The air-refrigerant heat exchange inlet pipe 42, the air-refrigerant heat exchange outlet pipe 43, and a part of the hot water storage tank 11 are accommodated inside the projecting portion 46. In addition, a soundproof material 47 (shown by hatching) is attached to the projecting portion 46 at a portion facing the air-refrigerant heat exchange pipe 42 and the air-refrigerant heat exchange pipe 43.

  That is, the compressor 4, the air-refrigerant heat exchanger 7, the radiator 5, the refrigerant cycle 2 connected to the decompression means 6, and the water-refrigerant heat exchanger 10 that exchanges heat with the radiator 5 are connected. A hot water storage tank 11 for storing hot water heated by the water-refrigerant heat exchanger 10 is housed in an integrated main body unit 1, and a rearward projecting portion 46 is provided in a housing behind the hot water storage tank 11 of the main body unit 1. An air-refrigerant heat inlet pipe 42 connected to the air-refrigerant heat exchanger 14 and a refrigerant heat-exchanged by the air-refrigerant heat exchanger 7 connected to the compressor 4 are provided on the protrusion 46. An air-refrigerant heat exchange outlet pipe 43 to be sent to the compressor 4 is housed.

  Hereinafter, the operation of the heat pump water heater will be described based on the drawings.

When the compressor 4 is operated, the refrigerant compressed and discharged to a high pressure is sent to the radiator 5 (water-refrigerant heat exchanger 10), and exchanges heat with tap water that has passed through the tap water supply pipe 18. Dissipate heat.
Thereby, the tap water flowing through the hot water storage pipe 21 and the original mixing valve 22 is heated to a high temperature. The refrigerant flowing out of the radiator 5 (water-refrigerant heat exchanger 10) is decompressed and expanded by the decompression means 6, sent to the air-refrigerant heat exchanger 7, and exchanges heat with the air sent by the blower fan 9. Then, it evaporates and gasifies while passing through the air-refrigerant heat exchanger 7. The gasified refrigerant is again sucked into the compressor 4 and is repeatedly compressed. The gradually heated tap water passes through the original mixing valve side pipe 21b and the original mixing valve 22 to the faucet 13a and the shower. Hot water is supplied to 13b or poured into the bath 28.

  Since the refrigerant cycle 2 has a slow rise and is inferior in the hot water property, the hot water storage tank 11 compensates for the poor rise. That is, until the refrigerant cycle 2 starts up and reaches a predetermined hot water supply temperature, the hot water that has passed through the tank hot water supply pipe 25 from the hot water storage tank 11 kept at a high temperature and the water-refrigerant heat exchanger 10 that has not yet started up. Water that has passed through the water (water that gradually rises in temperature and becomes high temperature) is mixed with the original mixing valve 22, and tap water that has passed through the inlet pipe 12 with the hot water mixing valve 26 and the bath pouring mixing valve 27 Mix and perform hot water supply or pouring at a predetermined temperature.

  Next, when the refrigerant cycle starts, the opening degree of the original mixing valve 22 is adjusted, hot hot water from the hot water storage tank 19 and hot water from the water-refrigerant heat exchanger 18 are mixed at an appropriate temperature, and a hot water supply mixing valve 26 and the bath pouring hot water mixing valve 27, and the hot water mixing valve 26 and the bath pouring hot water mixing valve 27 are mixed with tap water that has passed through the water inlet pipe 12 to supply hot water.

  Finally, the opening of the original mixing valve 22 is adjusted, the tank hot water supply pipe 25 side is closed, and the hot water that has passed through the tank hot water supply pipe 25 from the hot water storage tank 11 is not used. Hot water obtained by heating the tap water that has passed through the pipe 18 and the check valve 19 with the water-refrigerant heat exchanger 10 of the refrigerant cycle 2 is supplied through the original mixing valve 22 with the hot water supply mixing valve 26 and bath pouring. The mixture is sent to the mixing valve 27 and mixed with the tap water that has passed through the water inlet pipe 12 to obtain a predetermined temperature, and hot water is supplied to the faucet 13a and the shower 13b and poured into the bath 28. That is, the controller 39 grasps the rising state of the refrigerant cycle 2, adjusts the opening degree of the original mixing valve 22, the hot water supply mixing valve 26, and the bath pouring mixing valve 27, and supplies hot water of a predetermined temperature to the hot water supply terminal. Control is performed.

  Further, when the user closes the faucet 13a and the shower 13b, or when it is not necessary to supply hot water because an appropriate amount of hot water has accumulated in the bath 28, the hot water circulating water pump 15 is driven and the hot water storage three-way valve 23 is opened. For the hot water supply operation, a hot water storage operation in which hot water is stored in the hot water storage tank 11 is performed.

Thus, according to the rising state of the refrigerant cycle 2, hot water stored in the hot water storage tank 11 is used to supply hot water to the hot water supply terminal (faucet 13 a, shower 13 b, bath 28), without using the hot water storage tank 11. The hot water obtained by heating with the water-refrigerant heat exchanger 10 can be directly supplied to the hot water supply terminal. Thereby, in this Embodiment, real-time hot water supply is enabled, the hot water hot water performance which can supply hot water when a user wants to supply hot water can be ensured, and a heat pump water heater which is easy to use can be provided. In other words, by ensuring this quick hot water performance, the capacity of the hot water storage tank 11 can be made smaller than that of the hot water storage type heat pump water heater, which greatly improves installation, reduces costs, and improves usability. Can also be realized.

  At this time, the heat pump water heater of the present invention is provided with a protruding portion 46 projecting rearwardly on the back surface of the hot water storage tank 11 having a can body shape in the hot water storage cycle 3 of the main body unit 1. The main body unit 1 is made to contain a part of the rear part of the hot water storage tank 11, the air-refrigerant heat inlet pipe 42 and the air-refrigerant heat exchanger outlet pipe 43 connected to the air-refrigerant heat exchanger 10. The capacity of the hot water storage tank 11 can be increased while being compact, and the size of the air-refrigerant heat exchanger 7 configured by the refrigerant cycle 2 can be sufficiently secured, thereby improving the heat pump heating capacity. Can be possible. Therefore, in spite of being a compact main body, it is possible to improve the heat resistance of hot water, and it is possible to provide a heat pump water heater that is highly usable and excellent in installation.

  In particular, the air-refrigerant heat exchanger inlet pipe 42 and the air-refrigerant heat exchanger outlet pipe 43 are accommodated in the protruding portion 46, and the air-refrigerant heat exchanger 7 is protruded outward from the main unit 1. It is possible to increase the size to the vicinity in contact with the hot water storage tank 11 in the right direction, and it is possible to improve the heat pump capacity. Also, during maintenance, if the back of the housing of the main unit 1 is removed, the air-refrigerant heat exchange inlet pipe 42 and the air-refrigerant heat exchange outlet pipe 43 will be exposed, and the brazing of that part can be removed. Thus, the air-refrigerant heat exchanger 7 can be easily replaced. It is also possible to improve maintainability.

  Furthermore, by attaching a soundproof material 47 to the protruding portion 46, it is possible to prevent leakage of sound due to resonance of the compressor 4 and the refrigerant pipe 8 of the refrigerant cycle 2, and to reduce noise. Can do. In particular, the protruding portion 46 has a drum shape and is easily resonated. On the other hand, by sticking the soundproof material 47, it is possible to prevent resonance and prevent sound leakage to the rear, and a silent heat pump water heater can be obtained.

  Further, the projecting dimension of the protrusion 46 is set to be equal to or smaller than the minimum dimension of the air-refrigerant heat exchanger 7. Although the external view which looked at the main body unit 1 from the upper direction is shown in FIG. 5, it is 75 mm or more and 150 mm or less as the dimension. This can be seen from the graph of the back gap and capacity change in the heat pump water heater in FIG. 6, but when the back distance is narrowed, it passes through the air-refrigerant heat exchanger 7 that is forcibly sent by the blower fan 9. This shows that the amount of air is reduced and the heat pump capacity is reduced.

  As can be seen from FIG. 6, compared with a state where the opening is 500 mm or more, there is almost no change at 200 mm, but the capacity is reduced to −4.5% at 75 mm and −15% at 50 mm. Therefore, the distance between the back surfaces is set to 75 mm or more and 150 mm or less, and in this state, the capacity reduction is about -4.5% at the maximum, and can be set in a range not having a great influence. On the contrary, if it is opened 150 mm or more, the installation area will be increased correspondingly, which is in conflict with the advantage of compactness.

In addition, a gap for securing the air volume that passes through the air-refrigerant heat exchanger 7 is originally required on the back surface of the main unit 1, and considering this space, the projecting portion 46 of 75 mm or more and 150 mm or less. If so, there is no extra installation space, and it can be said that the installation space is the same as that without the protrusion 46. In addition, if the main unit 1 is installed so as to abut against the wall on the back side where the projecting portion 46 is installed, there is also an advantage that it can be used as a guide in that a gap capable of sufficiently securing the capacity can be secured. In addition, by ensuring a gap on the back surface, it is possible to provide a space where maintenance is possible, and a heat pump water heater excellent in maintainability can be obtained.

  Further, the protruding portion 46 is configured by deeply drawing the main body unit 1, and as will be understood from FIG. 2 and FIG. This is because although the cost of the mold is higher than that performed separately, the material cost is low and the total cost can be rationalized. Further, by integrating the protruding portion 46 with the housing of the main unit 1, it is possible to avoid unsafety due to water intrusion from the housing, and to provide a heat pump water heater excellent in safety.

  2 and 4, in the heat pump water heater of the present invention, the air-refrigerant heat inlet pipe 42 connecting the decompression means 6 and the air-refrigerant heat exchanger 7 is located outside the main unit 1, and the air The air-refrigerant heat exchange outlet pipe 43 connecting the refrigerant heat exchanger 7 and the compressor 4 is configured to be inward of the main unit 1. Thereby, it is set as the structure which makes the flow of a refrigerant | coolant parallel with respect to the air-refrigerant heat exchanger 7, and aims at the improvement of heat pump capability.

  Further, as can be seen in FIGS. 2 and 4, the air-refrigerant heat exchange inlet pipe 42 and the air-refrigerant heat exchange outlet pipe 43 housed in the protrusion 46 are arranged vertically, and the hot water storage tank 11. Even if the hot water storage tank 11 is enlarged, the refrigerant pipe 8 does not come into contact with each other, and the hot water storage tank can be made as large as possible while keeping the body size compact. The heat pump water heater excellent in usability can be achieved.

  In addition, the hot water storage tank 11 is wound with a vacuum heat insulating material 44 that is a highly compressible heat insulating material, and the vacuum heat insulating material 44 that is the high compressible heat insulating material and the protruding portion 46 are provided with a void around the entire circumference. Even when a lateral load is applied to the device at the time of installation or the like, the amount of movement of the tank can be minimized, so that it is possible to suppress the occurrence of dents and scratches on the exterior and the protrusion 46. Since the heat insulating material is interposed between the heat storage tank 11 and the hot water storage tank 11, the heat insulating material has a role as a buffer material even when a lateral load is applied to the device during transportation, installation, or the like. Thus, it becomes possible to suppress the occurrence of dents and scratches on the exterior, and a heat pump water heater excellent in quality and workability can be obtained.

  Moreover, in this Embodiment, it is set as the heat pump water heater using the carbon dioxide gas as a refrigerant | coolant. Thereby, the refrigerant circulation circuit is a supercritical refrigerant circulation circuit in which the pressure of the refrigerant becomes equal to or higher than the critical pressure, and the flowing water in the water flow path of the refrigerant-water heat exchanger is heated by the refrigerant whose pressure is increased to the critical pressure or higher. Since the refrigerant flowing through the radiator of the refrigerant-water heat exchanger is pressurized above the critical pressure by the compressor, the temperature is lowered due to heat being taken away by the flowing water in the water flow path of the refrigerant-water heat exchanger. Without condensation, it becomes easy to form a temperature difference between the refrigerant and water in the entire area of the refrigerant-water heat exchanger, high-temperature hot water can be obtained, and the heat exchange efficiency can be increased.

  In addition, since it is carbon dioxide, even if the refrigerant leaks to the outside, the effect on global warming is greatly reduced compared to the R-410A refrigerant used in general air conditioners. Can be made into an environmentally friendly heat pump water heater.

The heat pump water heater of the present invention includes a compressor 4, an air-refrigerant heat exchanger 7, a radiator 5, a refrigerant cycle 2 connected to the pressure means 6, and water-refrigerant heat that exchanges heat with the radiator 5. A hot water storage tank 11 that is connected to the exchanger 10 and stores hot water heated by the water-refrigerant heat exchanger 10 is housed in an integrated main body unit 1, and is placed in a housing behind the hot water storage tank 11 of the main body unit 1. The air-refrigerant heat exchanger pipe 7 connected to the air-refrigerant heat exchanger 7 and the compressor 4 are connected to the air-refrigerant heat exchanger 7. An integrated heat pump water heater having a configuration in which an air-refrigerant heat exchange outlet pipe 43 for sending the refrigerant heat-exchanged in the compressor 4 is housed, and containing the refrigerant cycle and the hot water supply cycle in one main unit. While maintaining its compactness , Improvement in capacity expansion and the heat pump capacity of the hot water storage tank, and to achieve low noise, aims to improve the hot water out strength, it is possible to heat pump water heater with excellent usability.

  As described above, the present invention is applied to a heat pump water heater that generates hot water in a heat pump cycle and supplies hot water, and is suitable for, for example, a domestic instantaneous water heater or a commercial hot water supply device.

The circuit block diagram of the heat pump water heater in the 1st Embodiment of this invention Top view of the heat pump water heater Front view of the heat pump water heater Side view of the heat pump water heater Top view of the heat pump water heater Relationship diagram between rear gap and capacity change of the heat pump water heater Circuit diagram of a conventional heat pump water heater Other circuit configuration diagram of conventional heat pump water heater Front view of a conventional heat pump water heater

Explanation of symbols

1 Main unit (case exterior)
2 Refrigerant cycle 3 Hot water supply cycle 4 Compressor 5 Radiator 6 Pressure reducing means (electric expansion valve)
7 Air-refrigerant heat exchanger 8 Refrigerant circuit 9 Blower fan 10 Water-refrigerant heat exchanger 11 Hot water storage tank 12 Inlet pipe 13a Faucet (hot water supply terminal)
13b Shower (hot water supply terminal)
DESCRIPTION OF SYMBOLS 14 Hot-water supply pipe 42 Air-refrigerant heat exchange inlet pipe 43 Air-refrigerant heat-exchange outlet pipe 44 Vacuum heat insulating material 45 Hot-water supply circuit 46 Protrusion part 47 Soundproof material

Claims (7)

A compressor, a radiator, a decompression means, and an air-refrigerant heat exchanger are sequentially connected to form a closed circuit, a refrigerant cycle for circulating the refrigerant, a water-refrigerant heat exchanger for exchanging heat with the radiator, A hot water storage tank for storing hot water heated by the water-refrigerant heat exchanger; and a housing for housing the component, wherein the housing has a projecting portion projecting outward, and the projecting portion is disposed in the projecting portion. A heat pump water heater, comprising a refrigerant pipe connected to the air-refrigerant heat exchanger and a part of the hot water storage tank. The heat pump water heater according to claim 1, wherein a soundproof material is provided at a facing portion of the refrigerant pipe connected to the air-refrigerant heat exchanger on the inner wall of the protruding portion. The heat pump water heater according to claim 1 or 2, wherein the protrusion has a protrusion dimension of 50 mm or more and 150 mm or less. The heat pump according to any one of claims 1 to 3, wherein a refrigerant inlet side pipe to the air-refrigerant heat exchanger is provided closer to an inner wall side of the housing than a refrigerant outlet side pipe. Water heater. The refrigerant pipe connected to the air-refrigerant heat exchanger has a branch pipe provided in the refrigerant inlet side pipe and a header pipe provided in the refrigerant outlet side pipe, and the branch pipe, the header pipe, and the protrusion It arrange | positioned, The heat pump water heater of any one of Claims 1-4 characterized by the above-mentioned. The high compressibility heat insulating material is disposed on the outer periphery of the hot water storage tank, and a gap is provided between the outer peripheral portion of the high compressibility heat insulating material and the inner wall of the protruding portion. The heat pump water heater according to claim 1. The heat pump water heater according to any one of claims 1 to 6, wherein carbon dioxide gas is used as the refrigerant.

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