JP2011099602A - Heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater capable of surely determining erroneous connection in a short time. <P>SOLUTION: The heat pump type water heater includes a heat pump unit 1 having a heat pump cycle therein, a water storage tank storing high temperature hot water, a circulating pump 9 sending the hot water in the hot water storage tank to a water-refrigerant heat exchanger, and a tank unit 2 having a flow rate detecting means 10 detecting a flow rate of the hot water when the circulating pump 9 is driven. A non-return means 24 for regulating a direction of the hot water flowing when the circulating pump 9 is driven is disposed in the heat pump unit 1, the heat pump unit and the tank unit are connected by a boiling pipe, and it is determined that the connection of the boiling pipe connecting the heat pump unit to the tank unit is in an opposite direction when it is detected that the flow rate detected by a flow rate sensor when the circulating pump is driven is the same or lower than a predetermined flow rate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  FIG. 5 shows a conventional heat pump type water heater described in Patent Document 1. As shown in FIG. As shown in FIG. 5, the heat pump type hot water heater includes a compressor 111, a heat pump circuit 110 having a hot water supply heat exchanger 112, and a temperature sensor (incoming water temperature detection) provided for detecting the incoming water temperature provided in the inflow side piping 112B. Means) 120D, a hot water storage circuit provided with a temperature sensor (hot water temperature detection means) 120E for detecting the hot water temperature provided in the outflow side pipe 112C, and a water inlet side connecting the heat pump circuit and the hot water storage tank 120 in the hot water storage circuit. The connecting pipe 125 and the hot water side connecting pipe 126 are configured.

  Then, the construction contractor makes a mistake at the time of construction, and reversely connects the incoming water side connection pipe 125 supplied to the hot water supply heat exchanger 112 and the hot water supply side connection pipe 126 returned from the hot water supply heat exchanger to the hot water storage tank. May end up. As a result, the incoming water temperature of the incoming water side connection pipe supplied to the hot water supply heat exchanger 112 (temperature detected by the temperature sensor 120D) and the outgoing hot water temperature of the outlet side connection pipe returned from the hot water heat exchanger to the hot water storage tank ( When the incoming water temperature is high, it is determined that the incoming water side connecting pipe 125 and the outgoing hot water side connecting pipe 126 are erroneously connected (for example, Patent Document 1). reference).

JP 2007-139419 A

  However, in the conventional configuration, the temperature of the hot water remaining in the incoming water connection pipe 125 may be lower than the temperature of the hot water in the hot water storage tank 120. This is because when the outside air temperature is very low, the hot water in the piping is cooled more than the inside of the hot water storage tank, and as a result, the temperature of the hot water in the piping becomes lower than the temperature of the hot water in the hot water storage tank. .

  As a result, the temperature of the hot water in the incoming side connection pipe 125 is higher than the temperature of the hot water in the hot water storage tank 120 by the temperature sensor 120E, although the incoming side connection pipe 125 and the outgoing hot water side connection pipe 126 are normally connected. As a result, the temperature detected by the temperature sensor 120E may detect a temperature lower than the temperature detected by the temperature sensor 120D. There was a problem that it was judged as an incorrect connection.

  This invention solves the said conventional subject, and it aims at providing the heat pump type hot water heater which can be judged to be a misconnection reliably in a short time.

In order to solve the above-described conventional problems, the heat pump type hot water heater of the present invention includes a heat pump cycle in which a compressor, a water refrigerant heat exchanger, a decompression device, and an evaporator are sequentially connected in an annular shape through a refrigerant pipe. A unit, a hot water storage tank for storing hot hot water, a circulation pump for sending the hot water in the hot water storage tank to the water-refrigerant heat exchanger, and a flow rate detection means for detecting the flow rate of hot water when the circulation pump is driven are provided. A non-return means for regulating the direction of hot water flowing when the circulation pump is driven is arranged in the heat pump unit, and the heat pump unit and the tank unit are connected by a heating pipe, and the circulation pump is When it is detected that the flow rate detected by the flow rate sensor is less than the predetermined flow rate when it is driven, the heat pump unit and the tank unit are connected. By determining that it boiled and connection of the pipe are opposite, it is possible to determine reliably reverse connection with a simple configuration.

  The present invention can provide a heat pump type hot water heater that can reliably determine an erroneous connection in a short time.

The block diagram of the heat pump type water heater in Embodiment 1 of this invention The block diagram of the heat pump type hot water heater (at the time of incorrect connection piping) in Embodiment 1 Control block diagram in the first embodiment Control flowchart in the first embodiment Configuration diagram of conventional heat pump water heater

  A heat pump hot water supply apparatus according to a first aspect of the invention stores a heat pump unit having a heat pump cycle in which a compressor, a water refrigerant heat exchanger, a decompression device, and an evaporator are sequentially connected in an annular manner through a refrigerant pipe, and high-temperature hot water. A heat pump comprising a hot water storage tank, a circulation pump for sending hot water in the hot water storage tank to the water-refrigerant heat exchanger, and a tank unit having a flow rate detecting means for detecting the flow rate of hot water when the circulation pump is driven. A non-return means for restricting the direction of hot water flowing when the circulation pump is driven is arranged in the unit, and the heat pump unit and the tank unit are connected by a heating pipe and detected by a flow sensor when the circulation pump is driven. When it is detected that the flow rate is below the specified flow rate, the connection of the heating pipe connecting the heat pump unit and the tank unit is By determining that the direction can be determined reliably reverse connection with a simple configuration.

  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 water heater in Embodiment 1 of the present invention. As shown in FIG. 1, the heat pump type water heater of the present invention includes a tank unit 1 and a heat pump unit 2.

  Next, the configuration in the tank unit 1 will be described. The tank unit 1 has a hot water storage tank 3 for storing hot hot water, and a water supply pipe 4 for supplying water from an external water supply source is connected to the bottom of the hot water storage tank 3. Moreover, it has the mixing valve 6 which mixes the hot water of the appropriate temperature supplied to the hot water supply terminal 5, mixes the hot water in the hot water storage tank 3 and the low temperature water from the water supply source at an appropriate temperature, and supplies it to the hot water supply terminal 5. ing.

Further, a tank-side lower boiling pipe 7 for sending low-temperature water to the heat pump unit 2 is connected to the bottom of the hot water storage tank 3, and the other end of the tank-side lower boiling pipe 7 is connected to an external pipe. Connected to the gate 8. The tank-side lower boiling pipe 7 is provided with a circulation pump 9 that sends hot water in the hot water storage tank 3 to the heat pump unit 2 and a flow rate sensor 10 that is a flow rate detection means for detecting the flow rate of hot water sent to the heat pump unit 2. ing. Further, a tank-side upper boiling pipe 11 for returning hot water boiled by the heat pump unit 2 is connected to the upper part of the hot water storage tank 3, and the other end of the tank-side upper boiling pipe 11 is connected to an external pipe. It is connected to the unit inlet 12.

  Next, the configuration within the heat pump unit 2 will be described. In the heat pump unit 2, a compressor 13 that compresses the refrigerant into a high-temperature / high-pressure refrigerant, a water-refrigerant heat exchanger 14 that exchanges heat between the high-temperature refrigerant and hot water to generate high-temperature hot water, and a decompression device that decompresses the refrigerant. 15. It has the heat pump cycle 17 comprised by connecting the evaporator 16 which heat-exchanges air and a refrigerant | coolant sequentially cyclically | annularly with refrigerant | coolant piping.

  Further, an HP-side lower boiling pipe 18 is connected to the inlet side of the flow path through which hot water flows in the water-refrigerant heat exchanger 14, and the other end of the HP-side lower boiling pipe 18 is connected to an external pipe. Connected to the HP hot water inlet 19. Moreover, the HP side upper boiling piping 20 is connected to the exit side of the flow path through which hot water flows in the water-refrigerant heat exchanger 14, and the other end of the HP side upper boiling piping 20 is connected to an external piping. Connected to the HP outlet 21.

  Further, the HP side lower boiling pipe 18 is provided with a temperature sensor 22 which is an incoming water temperature detecting means for detecting the incoming water temperature, and the HP side upper boiling pipe 20 is a temperature sensor which is a hot water temperature detecting means for detecting the hot water temperature. 23 and a check valve 24 which is a check means for restricting the flow in the reverse direction. By providing the check valve 24, the reverse flow of the water-refrigerant heat exchanger 14 is restricted.

  Further, the tank unit hot water outlet 8 and the heat pump unit hot water inlet 19 are connected by a lower boiling pipe 25, and the tank unit hot water inlet 12 and the heat pump unit hot water outlet 21 are connected by an upper boiling pipe 26. In the present embodiment, only the tank-side upper boiling pipe 11 is provided. For example, a three-way valve is arranged in the tank-side upper boiling pipe 11, and one end of the three-way valve is connected to the upper part of the hot water storage tank 3 and the other end. Is connected to the lower part of the hot water storage tank 3, and is connected to the lower part of the hot water storage tank 3 when the temperature detected by the temperature sensor 23 is lower than the predetermined temperature, and connected to the upper part of the hot water storage tank 3 when the temperature is higher than the predetermined temperature. The structure which controls a three-way valve may be sufficient.

  In the heat pump type water heater configured as described above, the installation contractor may connect the upper heating pipe 26 and the lower heating pipe 25 in reverse during installation work. The state at this time is shown in FIG. As a result, the boiling operation is not performed normally.

  Therefore, in the present embodiment, the erroneous connection of the pipe is detected by a method described later. Hereinafter, a method for detecting erroneous connection of piping in the present embodiment will be described.

  First, when the installation is completed, the installer performs a trial operation to confirm whether the boiling operation is normally performed. During the boiling trial operation or when the installation is completed without performing the trial operation, the boiling pump or the boiling trial operation is started by driving the circulation pump 9 during the first boiling operation.

  FIG. 3 is a block diagram showing erroneous connection detection control of the heat pump type hot water heater in Embodiment 1 of the present invention, and FIG. 4 shows erroneous connection detection control of the heat pump type hot water heater in Embodiment 1 of the present invention. It is a flowchart to show.

The erroneous connection detection means 40 shown in FIG. 3 includes a microcomputer and its peripheral circuits, and the erroneous connection detection means 40 includes a reference flow rate setting means 41, a flow rate comparison means 42, and an erroneous connection determination means 43. The reference flow rate setting unit 41 sets a reference flow rate for determining that the connection is incorrect from the operation instruction flow rate to the circulation pump 9. The flow rate comparing means 42 compares the flow rate detected by the flow sensor 10 with the flow rate set by the reference flow rate setting means 41. It is determined that the connection is incorrect. Then, as a result of determining that the connection is incorrect, an operation stop instruction for the heat pump cycle is sent to the operation stop means 48, and then the operation of the heat pump cycle is started again. However, if it is determined that the connection is still incorrect and the operation of the heat pump cycle is stopped, if the number of stoppages of the heat pump cycle exceeds the preset number of times set in advance, the failure display means 49 is displayed on the screen of the remote control or the like. Send instructions to give a fault indication.

  Next, erroneous connection determination control according to the first embodiment will be described with reference to FIG. First, at the start of the boiling trial operation at the time of the trial operation, or when the boiling start time comes, the circulating pump 9 is driven so that the hot water at the bottom of the hot water storage tank 3 is sent to the heat pump unit 2.

  Next, in STEP 1, it is determined whether or not a predetermined time (for example, 1 minute) has elapsed since the circulation pump 9 was driven. Here, if the upper boiling pipe 26 and the lower boiling pipe 25 are normally connected, the flow rate is stabilized during this predetermined time. By providing the predetermined time in this way, it is possible to eliminate a time during which the flow rate when the circulating pump 9 starts up is small. In addition, the specific numerical value of the predetermined time at this time is not limited to this Embodiment, It can change suitably according to the structure of a water heater.

  Next, in STEP 2, the flow rate sensor 10 detects the current flow rate. When it is determined in STEP 3 that the difference between the circulating flow rate of hot water instructed to the circulation pump 9 depending on the boiling temperature and the current flow rate is larger than the reference flow rate set by the reference flow rate setting means 41. If it is within the reference flow rate, the boiling operation is continued at STEP4.

  This is because if the lower boiling pipe 25 and the upper boiling pipe 26 are misconnected, the check valve 24 restricts the flow of hot water in the reverse direction. As a result, the flow rate is lower than the originally planned flow rate, and the flow rate of hot water drops. On the other hand, when the lower boiling pipe 25 and the upper boiling pipe 26 are normally connected, since hot water flows through the check valve 24 in the forward direction, the flow rate is not restricted.

  As described above, in the first embodiment, it is possible to reliably detect an erroneous pipe connection with a simple configuration.

  As described above, the hot water storage type hot water heater of the present invention is an integrated heat pump type hot water heater, a separate type heat pump type hot water heater configured separately, and a direct hot water type heat pump that can discharge hot water heated by a heat exchanger for hot water supply as it is. It can be applied to various heat pump water heaters such as water heaters.

DESCRIPTION OF SYMBOLS 1 Tank unit 2 Heat pump unit 3 Hot water storage tank 4 Water supply pipe 5 Hot water supply terminal 6 Mixing valve 7 Tank side lower boiling piping 7
8 Tank unit outlet 9 Circulation pump 10 Flow sensor 11 Tank side upper boiling pipe 12 Tank unit inlet 13 Compressor 14 Water refrigerant heat exchanger 15 Pressure reducing device 16 Evaporator 17 Heat pump cycle 18 HP side lower boiling pipe 19 HP Hot water inlet 20 HP side upper boiling pipe 21 HP hot water outlet 22 Temperature sensor 23 Temperature sensor 24 Check valve 25 Lower boiling pipe 26 Upper boiling pipe

Claims (1)

A heat pump unit having a heat pump cycle in which a compressor, a water-refrigerant heat exchanger, a decompression device, and an evaporator are sequentially connected in an annular shape through a refrigerant pipe, a hot water storage tank for storing hot hot water, and hot water in the hot water storage tank A tank unit having therein a circulation pump for sending to the water-refrigerant heat exchanger and a flow rate detecting means for detecting a flow rate of hot water when the circulation pump is driven, and the circulation pump is disposed in the heat pump unit. Non-return means for restricting the direction of hot water flowing when it is driven is arranged, the heat pump unit and the tank unit are connected by a heating pipe, and the flow rate detected by the flow rate sensor when the circulation pump is driven is Boiling piping connecting the heat pump unit and the tank unit when it is detected that the flow rate is below a predetermined flow rate Heat pump water heater, characterized in that it is determined that the connection is backward.

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