JPS60248946A - Heat pump device for hot water supply - Google Patents

Abstract

PURPOSE:To enable to obtain hot water with set temperature by a structure wherein a solenoid valve is arranged in the circulating pump side water piping of a hot water storage tank and the water temperature on the outlet side of a heat pump is detected so as to control a flow rate controlling motor-driven valve mounted at a city-water intake and a circulating pump equipped with an inverter. CONSTITUTION:No fear for a circulating pump 4 to suck air exists even when the water level in a hot water storage tank 2 lowers due to the sudden generation of load, because the hot water in the hot water storage tank 2 is prevented from being sucked by the circulating pump 4 by closing a solenoid valve 16 arranged in a water piping connecting the hot water storage tank 2 with a heat pump 1, when the supply of hot water to the hot water storage tank is intended. In addition, the amount of water to be fed is controlled by detecting the water temperature at the outlet side of the heat pump 1 so as to keep said water temperature constant. Accordingly, the hot water with said constant temperature is obtained even at the rise of the heat pump. Further, the temperature of hot water can be kept constant efficiently and quickly by running an inverter 17 at higher frequency when so intended.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flow rate control device for a heat pump device for hot water supply that heats water in a hot water storage tank using a heat pump.

[Prior art]

Conventionally, there has been a device of this type as shown in FIG. In this Figure 1, 1 is a heat pump for heating, 2
is a hot water tank. Heat pump 1 and hot water tank 2 are connected to water piping 3
a and 3b, and a circulation pump 4 is provided in the water pipe 3b.

In addition, in the water pipe 3b, there is a city water merging branch 8 between the hot water storage tank 2 and the circulation pump 4, and a water supply pipe 8a between the city water merging branch 8 and the city water intake 5 has an electromagnetic A valve 6 and an electric valve 7 for adjusting flow rate are provided.

The hot water tank 2 has a temperature sensor 12 and a water level switch 14.
is provided, and water piping 3 on the outlet side of the heat pump 1
A temperature sensor 15 is also provided at a. Temperature sensor 1
2, 15, the output of the water level switch 14 is the control device 1
It is now sent to 3. This control device W13 controls the circulation pump 4, the solenoid valve 6, the electric flow rate adjustment valve 7,
The heat pump 1 is controlled. Furthermore, a water pipe 9 on the load side is connected to the hot water storage tank 2.
This water pipe 9 is provided with a circulation pump 10 on the load side, and is also provided with a plurality of faucets 11 for supplying hot water.

Next, the operation will be explained. In this heat pump device for hot water supply, the circulation pump 1o on the load side is constantly operated, and when hot water is used from the faucet 11, the water returned to the hot water storage tank 2 decreases, and the water level in the hot water storage tank 2 reaches the full water level. Lower than level A.

This drop in water level is detected by the water level switch 14, and the control device 13 opens the solenoid valve 6, and the heat pump 1 and the circulation pump 4 are driven.

Water is supplied to the hot water storage tank 2 through a city water intake 5, a solenoid valve 6, a flow rate adjustment electric valve 7, a water supply pipe 8a, a city water confluence branch 8, and a circulation pump through a water distribution W3b. 4, heated by the heat pump 1, and supplied to the hot water storage m2 through the water pipe 3a.

At this time, the amount of water supplied is controlled by the electric flow rate regulating valve 7 whose opening degree is adjusted by the control device 13 based on the detection signal of the temperature sensor 15 so that the water temperature at the outlet of the heat pump 1 reaches the set value (for example, 55° C.). controlled.

That is, when the temperature detected by the temperature sensor 15 is lower than the set value, the electric valve 7 gradually closes to reduce the supply of city water, and as the temperature rises, the electric valve gradually opens to increase the supply of city water. Since the amount of water flowing into the heat pump 1 is constant, the insufficient water is supplied from the hot water storage tank 2, and water mixed with city water to be replenished flows into the heat pump 1.

In this way, hot water at a constant temperature is supplied to the hot water tank 2, and the temperature gradually increases. The water level in the hot water tank 2 gradually rises, and when it reaches the full water level A, the solenoid valve 6 closes and the heat pump 1 and circulation pump 4 stop. When the water temperature in the hot water tank 2 drops below the set value (for example, 50°C) due to heat loss,
The temperature is detected by the temperature sensor 12, and the control device 13 drives the heat pump 1 and the circulation pump 4 to perform a heat retention operation.

In the conventional heat pump device for hot water supply configured as described above, since the flow rate of the circulation pump 4 is constant, there is a risk that the circulation pump 4 may suck in air if the water level in the hot water storage tank 2 drops due to sudden hot water supply. For this reason, when the water level in the hot water storage tank 2 falls, a large amount of city water must be temporarily replenished into the hot water storage tank 2. Therefore, when the heat pump starts up, the water temperature in the hot water storage tank 2 does not reach the set temperature. There was 6 [
Summary of the Invention The present invention was made with the aim of improving the above drawbacks.A solenoid valve is attached to the water piping on the circulation pump side of the hot water storage tank to prevent hot water from flowing out from the hot water storage tank and to control the water temperature on the outlet side of the heat pump. We propose a heat pump device for hot water supply that can obtain hot water at a set temperature by detecting the temperature with a temperature sensor and controlling a circulation pump 4 equipped with an inverter and an electric flow rate adjustment valve installed at the city water intake. .

[Embodiments of the invention]

Hereinafter, the heat pump device for hot water supply according to the present invention will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a configuration diagram showing one embodiment of the present invention, and the same parts as in FIG.
6 is a solenoid valve installed in the water pipe 3b between the city water confluence branch 8 and the hot water storage tank 2; This was established to prevent the leakage of water. 17 is circulation pump 4
This is an inverter installed to adjust the outflow of.

In addition to the functions of the conventional control device 13 shown in FIG. There is. Note that the other configurations are the same as those shown in FIG.

Next, the operation of the hot water supply heat pump device of the present invention will be explained with reference to chart 7o in FIG.

When starting the heat pump, the solenoid valve 16 is closed and the solenoid valve 6. The electric valve 7 for flow rate adjustment is open (step s
i).

When the circulation pump 4 and the heat pump 1 are activated (step S2), city water is supplied from the city water intake port 5 of the water supply pipe 8a to the solenoid valve 6. The water is sent to the heat pump 1 by the circulation pump 4 via the electric flow rate adjustment valve 7 and the water pipe 3b, where it is heated to turn city water into hot water and supplied to the hot water storage tank 2. At this time, the flow rate adjustment electric valve 7 whose opening degree is adjusted so that the water temperature on the outlet side of the heat pump 1 is constant, such as 55°C, is supplied.
and flow 9, controlled by a regulated circulation pump 4 (
Step S3). That is, when the temperature detected by the temperature sensor 15 is lower than the set value, the flow rate adjustment electric valve 7 gradually closes, reducing the amount of city water supplied, lowering the frequency of the inverter 17, and reducing the flow rate of the circulation pump 4. Further, as the temperature rises, the electric flow rate regulating valve 7 opens, increasing the amount of city water supplied, increasing the frequency of the inverter 17, and increasing the flow rate of the circulation pump 4. In this way, hot water at a constant temperature is supplied into the hot water storage tank 2, and when the water level in the hot water storage tank 2 reaches the full water level A (step S4), the water level switch 14 detects this and electromagnetic Valve 6 closes and heat pump 1. The circulation pump 4 stops (step S5).

On the other hand, the circulation pump 4 on the load side is constantly operated, and when hot water is used from the faucet 11, the amount of water returned to the hot water tank 2 decreases, and the water level in the hot water tank 2 falls below the full water level A.

This drop in water level is detected by the water level switch 14 (step S6), and the control device 18 detects the drop in the solenoid valve 16.
．． The electromagnetic valve 6 is opened by the electric valve 7 for adjusting the flow rate, the heat pump 1 and the circulation pump 4 are driven, and the above-described operation is repeated.

In step S6, when the hot water tank 2 is full of water, the water temperature of the hot water tank 2 is set to a set value T1 of, for example, 50"C due to heat loss.
When the temperature drops below this level, it is detected by the temperature sensor 15 (step S7), and the control device 18 opens the solenoid valve 16 (step s8) while keeping the solenoid valve 6 and the electric flow rate adjustment valve 7 closed, and the heat pump 1 and the circulation pump 4 is driven to perform a heat retention operation (step S9). At this time, by increasing the frequency of the inverter 17, only the hot water in the hot water storage tank 2 is circulated while adjusting the flow rate of the circulation pump 4 so that the water temperature on the outlet side of the heat pump 1 does not rise too much (step 510). The heat retention operation is performed until the water temperature in the hot water storage tank 2 reaches a set value or higher (step 511).

In addition, although the above-mentioned Example demonstrated the heat pump apparatus for hot water supply, this invention is..

It can also be applied to heat pump devices that serve both air conditioning, hot water supply, heating, and cooling.

〔Effect of the invention〕

As explained above, when supplying hot water to the hot water storage tank 2, the circulation pump 4 supplies hot water in the hot water storage tank 2 by closing the solenoid valve 16 provided in the water pipe connecting the hot water storage tank 2 and the heat pump 1. Since air is prevented from being sucked in, even if a load suddenly occurs and the water level in the hot water storage tank 2 drops, there is no risk that the circulation pump 4 will suck in air. Furthermore, since the water supply amount can be adjusted so that the water temperature on the outlet side of the heat pump 1 is constant, hot water at a constant temperature can be obtained even when the heat pump starts up. Furthermore, in the case of heat retention, by operating the inverter at a high frequency, there is an effect that heat can be kept efficiently and quickly.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a conventional hot water supply heat pump device, FIG. 2 is a diagram showing the configuration of an embodiment of the hot water supply heat pump device of the present invention, and FIG. 3 is a flowchart showing the control of FIG. 2. be. 1... Heat pump, 2... Hot water storage tank, 3a. 3b...Water piping, 4...Circulation pump, 5...Municipal water intake, 6...Solenoid valve, 7...Electric valve for flow rate adjustment,
8...City water confluence branch, 8a...Water supply pipe, 9...
・Water piping on the load side, 1o...Circulation pump, 11...
Faucet, 1, 2, 15...Temperature sensor, 13...Control device, 14...Water level switch, 16...Solenoid valve, 17...Inverter, 18...Control device. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent: Masuo Oiwa (2 persons) (h) 3. Amendment to figure procedure (voluntary) October 9, 1980 Mr. Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 106731/1982 2. Name Heat F pump device for hot water supply 3, Person making the amendment 5, Subject of amendment (1) Claim 6 of the specification, Contents of amendment (1) The claims of the specification are amended as shown in the attached sheet. 7. Attached documents (1) A document stating the entire text of the amended claims. 1 copy. Amended claims 2. Claims heat pump and hot water storage tank - and water piping communicating between them. A heat pump device for hot water supply, comprising a circulation pump provided on one side of the water piping, and a water supply pipe that allows city water to flow into the water piping provided with the circulation pump via a solenoid valve and an electric valve capable of adjusting the flow rate. , various control commands are sent out based on signals from a first temperature sensor that detects the hot water temperature on the outlet side of the heat pump, a second temperature sensor that detects the hot water temperature of the hot water storage tank, and a water level sensor of the hot water storage tank. a control device that controls the circulation pump based on the temperature detected by the first temperature sensor; □ The flow rate is controlled by commands from the above control device. A P hot water amount heat pump device characterized by having an inverter.

Claims (1)

[Claims] A heat pump and a hot water storage tank, a water pipe that communicates between them, a circulation pump installed on one side of this water pipe, and a water supply system that supplies city water via a solenoid valve and an electric valve that can adjust the flow rate. A heat pump device for hot water supply comprising a water supply pipe for flowing into the pipe, a first temperature sensor for detecting the hot water temperature on the outlet side of the heat pump, a second temperature sensor for detecting the hot water temperature of the storage sW1, and a hot water storage tank. a control device that sends out various control commands based on signals from a water level sensor; a solenoid valve that is installed in a water pipe connecting the hot water tank and the heat pump and closes based on a command from the control device when city water is supplied; A heat pump device for hot water supply, comprising: an inverter that controls the speed of the circulation pump based on the temperature detected by the first temperature sensor (based on a command from the control device).