JP2009085560A - Heat pump type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat pump type water heater capable of efficiently automatically cleaning an air heat exchanger. <P>SOLUTION: In this heat pump type water heater where hot water in a hot water storage tank 7 is successively circulated to be boiled up by circulating hot water at the bottom of a hot water storage tank 7 to a hot water flow channel 33 through a forwarding-pipe 23 to be heated, and returning the hot water heated to a high temperature to an upper portion of the hot water storage tank 7 through a returning-pipe 24, a hot water guide pipe 37 is connected on the way of a heating circulating circuit 25 at the downstream side of a circulation pump 32 through a flow channel switching means 38, the hot water guide pipe 37 is disposed at an upper portion of a fin 40 of the air heat exchanger 29, a discharge pipe 41 having a downward nozzle 43 is made to communicate with a position bypassing a heat transfer pipe 42, and the air heat exchanger 29 can be cleaned by driving the circulation pump 32 in a state of switching the heating circulating circuit 25 to a hot water guide pipe 37 side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat pump type water heater that supplies hot water using a heat pump circuit.

Conventionally, in this type, an abnormality in the heating circulation circuit is detected based on the difference between the actual number of revolutions of the circulation pump and the target number of revolutions, and a display prompting maintenance is performed. (For example, refer to Patent Document 1.)
JP 2005-55124 A

  By the way, with this conventional device, the air heat exchanger in the heat pump circuit absorbs heat from the atmosphere, so it is attached in a state of being largely exposed outside the appliance, so it is always exposed to dust, dust, sand, yellow sand, etc. in the atmosphere. However, these impurities adhere to and accumulate on the surface of the air heat exchanger over time, which causes an increase in ventilation resistance and a decrease in heat exchange capacity.

  This invention pays attention to this point, and in order to solve the above-mentioned drawbacks, in particular, the configuration is a heat pump circuit in which an air heat exchanger having a compressor, a water refrigerant heat exchanger, an expansion valve, and an outdoor fan is connected in an annular shape with refrigerant piping. And a hot water storage tank for storing hot water, and the hot water storage tank and the hot water flow path of the water refrigerant heat exchanger include a heating circulation circuit configured to communicate with a forward pipe and a return pipe provided with a circulation pump. Then, hot water at the bottom of the hot water storage tank is circulated through the hot water flow path through the outgoing pipe and heated, and the hot hot water is returned to the upper part of the hot water tank through the return pipe and sequentially circulated to boil hot water in the hot water storage tank. In the heating circuit, a hot water pipe is connected to the heating circulation circuit downstream of the circulation pump via a flow path switching means, and the hot water pipe is attached to the upper portion of the fin of the air heat exchanger. Position away from heat tubes Communicating with the discharge tube having a downward jets, heating circulation circuit by driving the circulation pump Te switched to Shirubeyu pipe side, it is obtained by allowing the cleaning of the air heat exchanger.

  According to the second aspect of the present invention, the cleaning of the air heat exchanger is performed before the start of boiling by the hot water supply control unit that controls the boiling of the hot water in the hot water storage tank.

  As described above, according to the present invention, impurities accumulated in the air heat exchanger can be automatically cleaned and removed, and an increase in ventilation resistance and a decrease in heat exchange efficiency can be prevented, and a good heat can be obtained. Exchange is performed and it is extremely easy to use.

  In addition, if the air heat exchanger is cleaned before the start of boiling water, the air heat exchanger can always be boiled in a fresh state and boiled hot water with efficient and efficient heat exchange. Is done.

Next, a heat pump type water heater according to an embodiment of the present invention will be described with reference to the drawings.
1 is a hot water storage tank unit, 2 is a heating unit constituting a heat pump circuit, 3 is a hot water tap, 4 is a remote controller, 5 is a bathtub, and 6 is a power source.

  The hot water storage tank unit 1 includes a hot water storage tank 7 for storing hot water, a hot water pipe 8 connected to the upper part of the hot water storage tank 7, a water supply pipe 9 connected to the lower part of the hot water storage tank 7, and a high temperature from the hot water supply pipe 8. A mixing valve 11 for mixing water and low-temperature water from the bypass pipe 10 branched from the water supply pipe 9, a hot water supply pipe 12 connected downstream of the mixing valve 11, and a hot water supply temperature sensor 13 provided in the hot water supply pipe 12 A hot water flow rate sensor 14 provided in the hot water supply pipe 11, a water supply temperature sensor 15 provided in the water supply pipe 9, a hot water pipe 16 branched from the hot water pipe 12 and connected to the bathtub 5, and the hot water pipe A hot water filling valve 17 that opens and closes 16, a hot water filling flow rate sensor 18 that integrates the flow rate flowing through the hot water filling pipe 16, and an overpressure relief valve that releases an overpressure in the hot water storage tank 7 that is branched from the hot water discharge pipe 8. 19 and provided in the water supply pipe 9 A hot water supply control unit mainly composed of a pressure reducing valve 20 for reducing the supplied water pressure, a plurality of hot water temperature sensors 21 provided in the vertical direction of the side surface of the hot water storage tank 7, and a microcomputer for controlling the hot water storage tank unit 1. 22, a hot water storage tank 7 and the heating unit 2 are connected by a forward pipe 23 and a return pipe 24, and a heating circulation circuit 25 for circulating hot water is configured.

  The heating unit 2 includes a compressor 26 that compresses carbon dioxide refrigerant, a water refrigerant heat exchanger 27 as a condenser, an expansion valve 28, a heat pump circuit 30 including an air heat exchanger 29 as an evaporator, air An outdoor fan 31 that blows air to the heat exchanger 29, a variable capacity circulation pump 32 provided in the middle of the outgoing pipe 23 of the heating circulation circuit 25, and the thinnest part constituting the heating circulation circuit 25 of the water-refrigerant heat exchanger 27. A hot water inlet temperature sensor 34 for detecting the temperature of hot water flowing into the hot water flow path 33 and an outlet side of the hot water flow path 33 are provided on the inlet side of the hot water flow path 33 made of a pipe. The heat exchange outlet temperature sensor 35 for detecting the temperature of the hot water flowing out from the water and the heating control unit 36 mainly composed of a microcomputer for controlling the heating unit 2 are configured.

  Here, the power source 6 is an electric lamp according to the time zone, and is set at a low price for power charges at night (from 23:00 to 7:00 here). It heats up the amount of hot water needed for the day and uses it, and with this hourly lamp, power is also supplied in the daytime (from 7:00 to 23:00), and when the amount of remaining hot water decreases, additional boiling increases Is done. The power source 6 is connected to the hot water supply control unit 22, and a communication signal is superimposed on the remote controller 4 and the heating control unit 36 (including power necessary for the heat pump circuit 30) from the hot water supply control unit 22 in a wired manner. To be supplied.

  When the night time zone is reached, the hot water supply control unit 22 calculates the amount of hot water storage necessary for the next day, and instructs the heating control unit 36 to boil up the target hot water storage amount by the end of the night time zone. The circuit 30 is operated, and the driving of the circulation pump 32 of the heating circulation circuit 25 is started. Then, the hot water taken out from the lower part of the hot water storage tank 7 by driving the circulation pump 32 flows into the narrow hot water flow path 33 of the water refrigerant heat exchanger 27 and is heated, and is heated to the upper part of the hot water storage tank 7 through the heating circuit 25. By returning, hot water is stored.

  When the hot water storage temperature sensor 21 provided on the side surface of the hot water storage tank 7 detects that a predetermined amount of high temperature water has been stored, or when the heat exchange inlet temperature sensor 34 detects a predetermined temperature or higher, the hot water supply control is performed. The unit 22 commands the heating control unit 36 to stop the heating operation, the operations of the heat pump circuit 30 and the circulation pump 32 are stopped, and the boiling operation is completed by the end of the night time zone.

  Here, the amount of heat stored in the hot water storage tank 7 is calculated by the hot water supply control unit 22 as a target amount of stored hot water based on the amount of heat that seems to be appropriate from the hot water supply load for the past several days. Varies in the range of 60 ° C. to 90 ° C. depending on the season (or the feed water temperature detected by the feed water temperature sensor 15) and the amount of target hot water stored.

  Reference numeral 37 denotes a heating circuit 25 which is a hot water pipe connected between the circulation pump 32 and the hot water channel 33 via a channel switching means 38 such as a two-way valve. The discharge pipe 41 provided through the upper part of the plurality of fins 40 is communicated, and two lower surfaces of the discharge pipe 41 avoid two heat transfer pipes 42 penetrating the fins 40. A jet outlet 43 is provided, and the hot water pipe 37 side communicates with the heating circulation circuit 25 by the flow path switching means 38 and the circulation pump 32 is driven, so that the two hot outlets 43 of the discharge pipe 41 are connected to the bottom of the hot water storage tank 7. The air heat exchanger 29 is cleaned by washing out impurities adhering to the fins 40 by ejecting hot water.

  The remote controller 4 has a temperature setting switch 44 for setting a hot water supply set temperature, a hot water filling switch 45 for instructing hot water filling to the bathtub 5, a hot water filling amount setting switch 46 for setting the hot water filling amount, and a remaining time for hot water supply. An operation unit 48 having a remaining time display switch 47 for displaying the display, a display unit 49 made of a dot matrix type fluorescent display tube, the operation unit 48 and the display unit 49, and the hot water supply control unit 22 A remote control unit 50 mainly composed of a microcomputer that performs communication is provided. During normal operation, the display unit 49 detects the hot water supply set temperature and time information set by the operation unit 48 and the hot water storage temperature sensor 21. The remaining hot water storage amount is displayed.

  Next, when the hot-water tap 3 is opened, high-temperature water in the upper part of the hot water storage tank 7 is pushed out to the hot water discharge pipe 8 by the water supply pressure from the water supply pipe 9 and the mixing pipe 11 controlled by the hot water supply control unit 22 The low temperature water and the hot water temperature sensor 13 are mixed so that the temperatures detected by the operation unit 45 of the remote controller 4 are mixed and hot water is supplied via the hot water pipe 12.

  If the amount of hot water supply becomes larger than usual, the hot water supply control unit 22 detects that the remaining hot water storage amount detected by the hot water storage temperature sensor 21 is reduced during the daytime power hours, and the hot water is stored in the hot water storage tank 7. When the hot water is expected to run out, the necessary amount of heat is increased using the daytime power at that time.

  Next, when filling the bathtub 5, when the filling switch 45 of the remote controller 4 is operated, the hot water supply control unit 22 opens the filling valve 17 to start filling, and starts filling. When it is detected that the accumulated flow rate has reached the amount of filling, the filling valve 17 is closed to complete the filling.

Next, the cleaning operation of the air heat exchanger 29 will be described with reference to the flowchart of FIG.
The hot water supply control unit 22 now calculates the boiling time, and when the operation start time is set, confirms 5 minutes before that time (step 51), and proceeds to step 52 with YES to flow path switching means 38 is closed on the hot water flow path 33 side, and the hot water pipe 37 side is connected to the heating circuit 25 and the circulation pump 32 is started to discharge the hot water at the bottom of the hot water storage tank 7 from the hot water pipe 37. It is sent to the pipe 41 and ejected from the two outlets 43 of the discharge pipe 41 while avoiding the heat transfer pipe 42 to clean away impurities such as dust, dust, sand and yellow sand accumulated between the fins 40. In step 53, it is determined whether or not 5 minutes have elapsed. In step 54, the flow proceeds to step 54, the flow path switching means 38 is closed on the hot water pipe 37 side, and the heating circulation circuit 25 side is brought into communication. Stop driving After completing the cleaning of the air heat exchanger 29 is configured to transition to boiling operation mode.

In addition, by blowing out hot water avoiding the heat transfer tube 42 in this way, hot water can flow down the surface of the fin 40 vigorously downward, and the impurities adhering to the surface of the fin 40 can be surely washed away. By removing them by washing, it is possible to prevent an increase in ventilation resistance and a decrease in heat exchange efficiency, a good heat exchange is always performed, and it is extremely easy to use. Further, the air heat exchanger 29 is washed with hot water. If it is performed before the start of boiling, the air heat exchanger 29 can always perform a boiling operation in a fresh state, and a good boiling water can be boiled by efficient heat exchange without waste.
Furthermore, since it is periodically cleaned, impurities in the drain drainage channel are also washed away and there is no worry of clogging, so that it can be used with peace of mind.

  In this embodiment, the cleaning operation of the air heat exchanger 29 is performed before the boiling operation. However, the present invention is not limited to this. For example, the cleaning operation may be performed by pressing the cleaning switch. The washing operation may be performed once a week.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the heat pump type water heater which shows one Embodiment of this invention. FIG. The flowchart of the washing operation.

Explanation of symbols

7 Hot water storage tank 23 Outward pipe 24 Return pipe 25 Heating circulation circuit 27 Water refrigerant heat exchanger 29 Air heat exchanger 30 Heat pump circuit 32 Circulation pump 33 Hot water flow path 37 Hot water flow path 37 Hot water flow path 38 Flow path switching means 40 Fin 41 Release pipe 42 Heat tube 43 spout

Claims (2)

A heat pump circuit in which an air heat exchanger having a compressor, a water refrigerant heat exchanger, an expansion valve, and an outdoor fan is annularly connected by a refrigerant pipe, and a hot water storage tank for storing hot water. The hot water storage tank and the water refrigerant heat exchange The hot water flow path of the vessel is provided with a heating circulation circuit configured to communicate with a forward pipe provided with a circulation pump and a return pipe, and hot water at the bottom of the hot water storage tank is circulated to the hot water flow path via the forward pipe. Heated and heated hot water is returned to the upper part of the hot water storage tank through a return pipe and circulated in order to boil the hot water in the hot water storage tank. A hot water pipe is connected via a switching means, and this hot water pipe is attached to the upper part of the fin of the air heat exchanger and communicates with a discharge pipe having a downward jet at a position avoiding the heat transfer pipe, Circulation circuit on the hot water pipe side By driving the circulation pump Te conversion, heat pump water heater, characterized in that allowed the cleaning of the air heat exchanger. The heat pump type hot water heater according to claim 1, wherein the air heat exchanger is cleaned before the start of boiling by a hot water supply control unit that controls boiling of hot water in the hot water storage tank.

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