JP2012013357A - Heat pump type hot-water heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat pump type hot-water heating device capable of preventing blowing-off of warm air from a cooling terminal and cooling of hot water in a hot water supply tank in switching an operation.SOLUTION: The heat pump type hot-water heating device includes: a refrigerating cycle constituted of a compressor 1, a four-way valve 2, a water-refrigerant heat exchanger 3 exchanging heat between a refrigerant and the water, a pressure reducing device 4, and an outdoor heat exchanger 5; a water circuit 20a for hot water supply constituted of the water-refrigerant heat exchanger 3, a flow channel switching valve 26 for switching a flow channel of the water from the water-refrigerant heat exchanger 3, a hot water storage tank 22 for storing water of high temperature, a flow channel collecting section 25 for the water returning to the water-refrigerant heat exchanger 3, and a water pump 8 for distributing the water to the water-refrigerant heat exchanger 3; a water circuit 20b for cooling configured by successively connecting the water-refrigerant heat exchanger 3, the flow channel switching valve 26, a cooling terminal 24 for cooling the air by cold water from the water-refrigerant heat exchanger 3, the flow channel collecting section 25, and the water pump 8; and a bypass water circuit 20c configured by connecting the flow channel switching valve 26 and the flow channel collecting section 25. The water is allowed to flow to the bypass water circuit 20c until a water inflow temperature to the water-refrigerant heat exchanger 3 reaches a prescribed temperature.

Description

  The present invention relates to a heat pump hot water heater, and more particularly to switching control between a cooling operation and a hot water supply operation.

Conventionally, hot water heaters using boilers that use kerosene or gas as fuel have spread mainly in cold regions, but recently, hot water using heat pump technology from the viewpoint of ecology such as energy saving and CO ₂ emission reduction. Heating devices have been developed.

  As a conventional heat pump type hot water heater, there is one as shown in FIG. 3 (for example, see Patent Document 1).

  FIG. 3 is a configuration diagram of a conventional heat pump hot water heating apparatus described in Patent Document 1.

  In FIG. 3, in the conventional heat pump hot water heater, the compressor 1 is stopped when switching between a hot water supply operation for supplying high temperature water to the hot water supply tank 22 and a cooling operation for supplying cold water to the cooling terminal 24 in summer. At the same time that the four-way valve 2 is switched, a water circuit that supplies hot water generated by the water refrigerant heat exchanger 3 to the hot water supply tank 22 side, and water that supplies cold water generated by the water refrigerant heat exchanger 3 to the cooling terminal 24 side. The circuit is switched by the three-way valve 21, and the compressor 1 is restarted.

JP 2010-112630 A

  However, immediately after the water circuit is switched by the three-way valve 21, the previous high-temperature water or cold water remains between the flow path concentration part 25 on the side where the water-refrigerant heat exchanger 3 is located and the three-way valve 21. Therefore, there has been a problem that hot air is blown out from the cooling terminal 24 or the hot water in the hot water supply tank 22 is cooled by the cold water.

  This invention solves the said conventional subject, and it aims at providing the heat pump type hot water heating apparatus which can prevent the blowing of the warm air from a cooling terminal and cooling of the warm water in a hot water supply tank at the time of operation switching. .

In order to solve the above-described conventional problems, a heat pump hot water heating apparatus of the present invention includes a compressor that compresses a refrigerant, a four-way valve that switches a refrigerant flow path, a water refrigerant heat exchanger that exchanges heat between the refrigerant and water, A decompression device that decompresses the refrigerant, a refrigeration cycle in which outdoor heat exchangers that exchange heat between the refrigerant and air are sequentially connected in an annular manner, the water refrigerant heat exchanger, and water that flows out of the water refrigerant heat exchanger A flow path switching valve for switching the flow path, a hot water supply tank for storing hot water for hot water supply using high-temperature water generated by the water-refrigerant heat exchanger, a flow path concentrator for water returning to the water-refrigerant heat exchanger, A hot water supply water circuit in which water pumps for sending water to a water refrigerant heat exchanger are sequentially connected in a ring shape, and cold water generated by the water refrigerant heat exchanger, the flow path switching valve, and the water refrigerant heat exchanger are used. Cooling terminal that performs cooling, the flow path concentrator, and the water pump Cooling water circuit that is sequentially connected in an annular manner, a bypass water circuit that connects the flow path switching valve and the flow path concentration portion, and an incoming water temperature detecting means that detects the temperature of water flowing into the water-refrigerant heat exchanger When switching between the hot water supply water circuit and the cooling water circuit, the flow path switching valve is provided on the bypass water circuit side until the incoming water temperature detected by the incoming water temperature detecting means reaches a predetermined temperature. When the operation is switched, the water / refrigerant heat exchanger may set the temperature of the water in the water circuit connecting the outlet-side flow path concentrator and the flow path switching valve to a predetermined temperature suitable for hot water supply or cooling operation. Therefore, it is possible to prevent the blowing of warm air from the cooling terminal and the cooling of the hot water in the hot water supply tank.

  The heat pump type hot water heating apparatus of the present invention can reliably prevent the blowing of hot air from the cooling terminal and the cooling of the hot water in the hot water supply tank at the time of operation switching.

The block diagram of the heat pump type hot water heating apparatus in Embodiment 1 of this invention The flowchart which shows the control at the time of the operation switching of the heat pump type hot water heating apparatus Configuration diagram of conventional heat pump hot water heater

  1st invention is the compressor which compresses a refrigerant | coolant, the four-way valve which switches a refrigerant | coolant flow path, the water refrigerant | coolant heat exchanger which heat-exchanges a refrigerant | coolant and water, the decompression device which decompresses a refrigerant | coolant, and a refrigerant | coolant and air heat-exchange A refrigeration cycle in which outdoor heat exchangers are sequentially connected in an annular manner, the water refrigerant heat exchanger, a flow path switching valve for switching a flow path of water flowing out of the water refrigerant heat exchanger, and the water refrigerant heat exchange A hot water supply tank that stores hot water for hot water supply using high-temperature water generated in a water heater, a water flow path concentrator that returns to the water refrigerant heat exchanger, and a water pump that sends water to the water refrigerant heat exchanger A hot water supply water circuit connected to the water refrigerant heat exchanger, the flow path switching valve, a cooling terminal for cooling using cold water generated by the water refrigerant heat exchanger, the flow path concentrating portion, A cooling water circuit in which water pumps are sequentially connected in a ring, and the flow path switching valve; A bypass water circuit to which the flow path concentrating portion is connected, and an incoming water temperature detecting means for detecting the temperature of water flowing into the water refrigerant heat exchanger, and when switching between the hot water supply water circuit and the cooling water circuit, The flow path switching valve is communicated with the bypass water circuit side until the incoming water temperature detected by the incoming water temperature detecting means reaches a predetermined temperature. When the operation is switched, the water refrigerant heat exchanger is connected to the outlet side. Since the temperature of the water in the water circuit connecting the flow path collecting section and the flow path switching valve can be set to a predetermined temperature suitable for hot water supply or cooling operation, hot air is blown from the cooling terminal or hot water in the hot water supply tank Cooling can be prevented.

  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)
FIG. 1 is a configuration diagram of a heat pump type hot water heating apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a flowchart showing control at the time of operation switching of the heat pump type hot water heating apparatus.

  First, the structure of the heat pump type hot water heating apparatus in the present embodiment will be described with reference to FIG.

  The heat pump type hot water heating apparatus according to the present embodiment exchanges high temperature water by exchanging heat between the compressor 1 that compresses the refrigerant and discharges the high temperature refrigerant, the four-way valve 2 that switches the refrigerant flow path, and water and the high temperature refrigerant. A water refrigerant heat exchanger 3 to be generated, a decompression device 4 for decompressing the refrigerant, and an outdoor heat exchanger 5 for exchanging heat between the air and the refrigerant are sequentially connected in an annular manner by a refrigerant pipe 7. is doing.

Furthermore, it has the ventilation fan 6 for ventilating to the outdoor heat exchanger 5, and the temperature sensor 5a which is an external temperature detection means which detects the temperature of the air inhaled by the outdoor heat exchanger 5. Note that although R410A is used as the refrigerant, other fluorocarbon refrigerants can be used. The compressor 1 is a hermetically sealed type, and a motor is disposed on the high pressure side, and a rare earth magnet is used for the motor. Further, by adopting a configuration that does not use an accumulator, it is possible to reduce the size and weight.

  In the present embodiment, the water refrigerant heat exchanger 3, the flow path switching valve 26 that switches the flow path of the water that flows out of the water refrigerant heat exchanger 3, and the high-temperature water generated by the water refrigerant heat exchanger 3 are used. A hot water supply tank 22 for warming and storing water for hot water supply (for example, a shower, etc.) flowing in the hot water supply heat exchanger 23, and a water flow path concentrating portion 25 returning to the water-refrigerant heat exchanger 3, A water pump 8 provided on the inlet side of the water-refrigerant heat exchanger 3 and for sequentially sending water to the water-refrigerant heat exchanger 3 is annularly connected to form a hot water supply water circuit 20a. , A flow switching valve 26, a cooling terminal 24 (for example, a fan coil unit) that cools the room by flowing cold water generated by the water-refrigerant heat exchanger 3, a flow channel concentrating unit 25, and the water pump 8. The cooling water circuit 20b is formed by sequentially connecting in an annular shape. Reference numeral 20 c denotes a bypass water circuit that connects the flow path collecting portion 25 and the flow path switching valve 26.

  Thereby, the hot water supply water circuit 20a on the hot water supply heat exchanger 23 side and the cooling water circuit 20b on the cooling terminal 24 side are switched by switching the flow path switching valve 26 provided on the outlet side of the water refrigerant heat exchanger 3. The water circulates in the bypass water circuit 20c.

  Further, a temperature sensor 3a serving as a water temperature detecting means for detecting the water temperature is provided on the inlet side of the water refrigerant heat exchanger 3, and a water temperature detection for detecting the water temperature is provided on the outlet side of the water refrigerant heat exchanger 3. A temperature sensor 3b as means is provided.

  In the hot water supply or cooling operation of the heat pump type hot water heating apparatus, the hot water pump 8 is driven to circulate the cold / hot water in the hot water supply heat exchanger 23 or the cooling terminal 24, and the cold / hot water detected by the temperature sensor 3 b. The refrigeration cycle is operated until it is detected that the temperature is higher than a set temperature set by a remote control device or the like (not shown) (low during cooling operation), and the temperature detected by the temperature sensor 3b is the set temperature. If a temperature higher than a predetermined temperature (lower during cooling operation) is detected, the operation of the refrigeration cycle is stopped.

  On the other hand, in the operation of the refrigeration cycle, the temperature of the refrigerant discharged from the compressor 1 is detected, and the opening degree of the decompression device 4 is controlled so that the temperature of the discharged refrigerant becomes a predetermined temperature. However, since the temperature of the water circulating in the cooling terminal 24 or the hot water supply heat exchanger 23 must be detected even after the operation of the refrigeration cycle is stopped, the water pump 8 remains in the driven state. To do. The water pump 8 may be an AC pump or a DC pump.

  Moreover, the heat pump type hot water heating apparatus of the present embodiment accommodates the components other than the water refrigerant heat exchanger 3 among the functional components constituting the refrigeration cycle as shown in FIG. 1 in the housing of the heat pump unit 10a. The water refrigerant heat exchanger 3 and the hot water pump 8 may be housed in the housing of the heat exchange unit 10b.

  In this case, the heat pump unit 10a is arranged outdoors, and the heat exchange unit 10b is arranged indoors, so that the indoor and the outdoor are connected by the refrigerant pipe 7. Therefore, even when the outside air temperature is low, such as in winter, the indoor and the outdoor are connected by the refrigerant pipe 7, so that there is an advantage that the risk of freezing is lower than when the water pipe is connected.

  Each of the heat pump unit 10a and the heat exchange unit 10b has control devices 11a and 11b, and gives an operation instruction to the devices provided in each unit.

  In the heat pump type hot water heating apparatus according to the present embodiment configured as described above, control during operation switching will be described below with reference to FIG.

  When the operation switching is started, the compressor 1 is first stopped (Step 1), the flow path switching valve 26 is switched to the bypass water circuit 20c side (Step 2), and the compressor 1 is waited for 3 minutes (Step 3). Step 3).

  If 3 minutes have elapsed since the compressor 1 was stopped, the compressor 1 is restarted (step 4), and the incoming water temperature detected by the temperature sensor 3a gradually changes. In step 5, the incoming water temperature detected by the temperature sensor 3a is confirmed, whether or not the temperature is higher than a predetermined temperature during hot water supply, and whether or not it is lower than the predetermined temperature during cooling. If the condition is satisfied, the flow path switching valve 26 is switched from the bypass water circuit 20c to the hot water supply water circuit 20a or the cooling water circuit 20b (step 6). When the condition is not satisfied, the bypass water circuit 20c side is maintained, and it waits for the incoming water temperature to enter the predetermined temperature range.

  As described above, the heat pump hot water heating apparatus according to the present embodiment can prevent the blowing of hot air from the cooling terminal and the cooling of hot water in the hot water supply tank at the time of operation switching.

  Further, in the above-described embodiment, the flow path switching valve 26 is described outside the heat exchange unit 10b. However, the present invention can be applied to a configuration in which the flow path switching valve 26 is housed in the housing of the heat exchange unit 10b. it can.

  As described above, the heat pump hot water heating apparatus of the present invention can prevent hot air blowing from the cooling terminal and cooling of the hot water in the hot water supply tank when switching operation, and can be applied to various heat pump hot water heating apparatuses. Is.

1 Compressor 2 Four-way valve 3 Water refrigerant heat exchanger 3a Temperature sensor
3b Temperature sensor 4 Pressure reducing device 5 Outdoor heat exchanger 5a Temperature sensor (outside air temperature detection means)
6 Blower Fan 8 Water Pump 10a Heat Pump Unit 10b Heat Exchange Unit 20a Hot Water Supply Water Circuit 20b Cooling Water Circuit 20c Bypass Water Circuit 22 Hot Water Tank 23 Hot Water Heat Exchanger 24 Cooling Terminal 25 Channel Concentration Unit 26 Channel Switch Valve

Claims (1)

Compressor for compressing refrigerant, four-way valve for switching refrigerant flow path, water refrigerant heat exchanger for heat exchange between refrigerant and water, decompression device for depressurizing refrigerant, outdoor heat exchanger for heat exchange between refrigerant and air A refrigeration cycle in which the water refrigerant heat exchanger, a flow path switching valve for switching a flow path of water flowing out of the water refrigerant heat exchanger, and high-temperature water generated by the water refrigerant heat exchanger A hot water supply tank for storing hot water for hot water supply, a flow path concentrator for water returning to the water refrigerant heat exchanger, and a water pump for sequentially supplying water to the water refrigerant heat exchanger An irrigation circuit, the water refrigerant heat exchanger, the flow path switching valve, a cooling terminal that performs cooling using the cold water generated by the water refrigerant heat exchanger, the flow path concentrating portion, and the water pump are sequentially annularized. Cooling water circuit formed by connection, the flow path switching valve, and the flow path concentration portion A connected bypass water circuit and an incoming water temperature detecting means for detecting a temperature of water flowing into the water refrigerant heat exchanger, and the incoming water temperature detecting means when switching between the hot water supply water circuit and the cooling water circuit. The heat pump type hot water heating apparatus is characterized in that the flow path switching valve is communicated with the bypass water circuit side until the incoming water temperature detected by the above reaches a predetermined temperature.

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