JP2006250501A - Storage type hot water supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage type hot water supply device for allowing extremely easy air purging work during construction. <P>SOLUTION: The storage type hot water supply device comprises a hot water storage tank 7 for storing hot water heated to a high temperature by a heating means 2, a water supply pipe 9 and a tapping pipe 8 connected to the lower part of the hot water storage tank 7 and to the upper part thereof, respectively, an automatic purging valve 38 communicated with the top of the hot water storage tank 7, and an electric water stop valve 39 provided in the water supply pipe 9. Herein, a commissioning mode is provided for automatically opening and closing the automatic purging valve 38 and the electric water stop valve 39 during commissioning when filling water in the hot water storage tank 7 being purged. The purging of the hot water storage tank and the filling of hot water therein are automatically carried out on an equipment side in an extremely convenient manner with no need for a person to watch and check such processes. Particularly for a complex housing such as an apartment house or a condominium building in which many equipments are installed at a time, minimum workers are required to improve working efficiency. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a test operation after construction of a hot water storage type hot water supply apparatus that heats hot water and supplies hot water using a heat pump circuit or an electric heater.

Conventionally, in this type of hot water supply device, for the test run after construction, after manually opening the pressure relief valve communicating with the top of the hot water tank, the hot water tank is used while supplying water and venting the air in the hot water tank. A trial run was made to fill the water. (For example, Patent Document 1)
JP 2004-85060 A

  By the way, in this conventional system, since water overflows from the pressure relief valve, it is necessary to confirm that the hot water tank has been evacuated and the water filling is completed, and the pressure relief valve must be closed manually. In an apartment building such as an apartment or a condominium where many appliances are installed at the same time, this check alone requires a lot of workers or spends a lot of time, which is extremely inefficient. It had a problem called.

  The present invention pays attention to this point, and in order to solve the above problems, in claim 1, a hot water storage tank for storing hot water heated to a high temperature by a heating means, a water supply pipe connected to the lower part of the hot water storage tank, and an upper part A hot water pipe is connected to the top of the hot water storage tank, and an automatic air vent valve is connected to the top of the hot water storage tank, and the water supply pipe is equipped with an electric stop valve. A test operation mode is provided in which the automatic air vent valve and the electric stop cock are automatically opened and closed during the test operation.

  Further, in claim 2, the test operation mode is started by operating a test operation switch provided in a remote controller or a hot water storage tank unit. In claim 3, the test operation mode starts counting from the start of the test operation. In the fourth aspect, the test operation mode is ended by water supply detection by a water supply sensor provided in the automatic air vent valve.

  According to the first aspect of the present invention, since the air evacuation and water filling in the hot water storage tank are automatically performed on the appliance side, there is no need for a person to stick and check each time. In an apartment building where many instruments are installed at a time, etc., work efficiency is high and it can be performed by a minimum number of workers.

  Further, in claim 2, the test operation mode is started only by a simple operation of operating a remote control or a test operation switch of the hot water storage tank unit, and it is extremely convenient to use, and in claim 3, a preset timer is used. Since the trial operation mode is completed in time, it is automatically terminated when the time comes, and can be used with peace of mind. In claim 4, the trial operation mode is terminated by the detection of water supply by the water supply sensor. It can be detected by detecting that the air venting and water filling have been completed, and it is reliable and safe.

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 means constituting a heat pump circuit, 3 is a hot water tap, 4 is a remote control, 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, and hot water from the hot water supply pipe 8. A mixing valve 11 for mixing low temperature water from the bypass pipe 10 branched from the water supply pipe 9, a hot water temperature sensor 13 provided in a hot water supply pipe 12 connected downstream of the mixing valve 11, and a hot water supply pipe 12. A hot water supply flow sensor 14 provided, a water supply temperature sensor 15 provided in the water supply pipe 9, a hot water supply pipe 16 branched from the hot water supply pipe 12 and connected to the bathtub 5, and the hot water supply pipe 16 is opened and closed. A hot water filling valve 17, a hot water filling flow rate sensor 18 that integrates the flow rate flowing through the hot water filling pipe 16, an overpressure relief valve 19 that branches off from the hot water discharge pipe 8 and releases the overpressure of the connected hot water storage tank 7; Provided in the water supply pipe 9 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 hot water supply control unit mainly composed of a microcomputer for controlling the hot water storage tank unit 1 22, the hot water storage tank 7 and the heating means 2 are connected by a forward pipe 23 and a return pipe 24 to form a heating circulation circuit 25 for circulating hot water.

  The heating means 2 includes a compressor 26 for compressing carbon dioxide refrigerant, a water refrigerant exchanger 27 as a condenser, an expansion valve 28, and an air heat exchanger 29 as an evaporator, and a heat pump circuit 30 and an air heat exchanger. Hot water comprising an outdoor fan 31 for blowing air 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 pipe constituting the heating circulation circuit 25 of the water refrigerant exchanger 27 A heat exchange inlet temperature sensor 34 that detects the temperature of hot water flowing into the hot water flow path 33 and provided on the outlet side of the hot water flow path 33 and flows from the hot water flow path 33. The heat exchanger outlet temperature sensor 35 for detecting the temperature of the air, the antifreezing temperature sensor 36 for detecting the temperature of the outside air, and a microcomputer for controlling the heating means 2 are mainly configured. And a heating control unit 37 to be.

  An automatic air vent valve 38 communicates with the top of the hot water storage tank 7 and receives a test operation start signal, thereby generating a magnetic force and automatically opening a valve body (not shown). At the same time, the electric stop cock 39 provided in the water supply pipe 9 is opened to supply water to the hot water storage tank 7.

  40 is an electric three-way valve that constitutes a flow path switching means provided in the middle of the return pipe 24 in the hot water storage tank unit 1. In normal times, the return pipe 24 is in a communicating state and is connected only during the air venting operation after construction. The drain pipe 41 and the return pipe 24 on the outlet side of the hot water flow path 33 are in communication with each other, and the air in the hot water flow path 33 and the heating circuit 25 is pushed out of the circuit with tap water pressure.

  The remote controller 4 includes a hot water supply switch 42, a temperature setting switch 43 for setting a hot water supply set temperature, a hot water switch 44 for instructing hot water filling to the bathtub 5, a hot water amount setting switch 45 for setting the hot water amount, and a trial operation switch. 46, a display unit 48 including a dot matrix type fluorescent display tube, and a microcomputer that controls the operation unit 47 and the display unit 48 and communicates with the hot water supply control unit 22. The remote control unit 49 is configured so that, during normal operation, the hot water supply set temperature and time information set by the operation unit 47 and the remaining hot water storage amount detected by the hot water temperature sensor 21 are displayed on the display unit 48. When the test operation switch 46 is pressed, a test operation start signal is output to the hot water supply control unit 22. The drain valve 38 and the electric water stop valve 39 are opened, and water is filled in the hot water storage tank 7 through the electric stop valve 39 while the air in the hot water storage tank 7 is extracted from the automatic air vent valve 38. In response to a test start signal, a predetermined time measured in advance in a test, where the timer 50 counts for 30 minutes, and the automatic air vent valve 38 and the electric stop cock 39 are closed to end the test operation mode. After the end, the air circulation operation of the heating circuit 25 is continuously started, and the hot water supply control unit 22 connects the electric three-way valve 40 from the return pipes 24 to the drain pipe 41 and the hot water flow path. 33, the return pipe 24 on the outlet side is brought into a communication state, and the timer 50 counts again for a preset predetermined time, here 30 minutes, and the electric three-way valve 40 is returned to the original state by counting up, It is intended to terminate the A punching operation.

Next, the operation of this embodiment shown in FIGS. 1 to 4 will be described.
The appliance is now installed, the hot water supply circuit, the bath circuit, the water supply pipe 9 and the hot water supply pipe 12 are connected by piping, and then the power supply 6 is connected to complete the construction. (Step 51), a test start signal is output to the hot water supply control unit 22 in YES. The hot water supply control unit 22 opens the automatic air vent valve 38 and the electric stop cock 39 in step 52, and The timer 50 starts counting for a set predetermined time, here 30 minutes.

  As a result, the hot water storage tank 7 starts water supply from the water supply pipe 9 through the electric water stop valve 39, and the air in the hot water storage tank 7 is sequentially pushed up by this water supply and escapes from the automatic air vent valve 38 communicating with the top. Therefore, it is possible to automatically and satisfactorily perform air bleeding and water filling in the hot water storage tank 7.

  Then, when the timer 50 counts up for 30 minutes by proceeding to step 53, the process proceeds to step 54 with YES to close the automatic air vent valve 38 and the electric water stop valve 39, and to end the test operation mode. The 30-minute count by the timer 50 sets a time for the hot water storage tank 7 to be full in advance in the test. Naturally, if the capacity of the hot water storage tank 7 is changed, the predetermined time is also changed.

  Further, after the trial operation mode ends, in step 55, it is determined whether the timer 50 has passed for a predetermined time, here, 1-2 minutes. In order to continue the air circulation of the heating circuit 25 with YES, the process proceeds to step 56 and the electric three-way valve 40 from the communication between the return pipes 24, the drain pipe 41 and the return pipe 24 on the outlet side of the hot water flow path 33 are brought into a communication state, and the timer 50 starts counting again for a preset predetermined time, here 30 minutes. To do.

  As a result, the water supplied from the water supply pipe 9 flows through the bottom of the hot water storage tank 7 through the forward pipe 23 and from the hot water flow path 33 to the return pipe 24 and the drain pipe 41. The water from the drain pipe 41 flows into the drainage channel.

  In step 57, when 30 minutes have elapsed and the timer 50 has timed up, the process proceeds to step 58 in YES, the electric three-way valve 40 is returned to the original state, and the air bleeding operation is terminated. The minute is the time plus the margin, and there is no worry about wasteful drainage, and the piping is automatically vented without manual operation, and the water pressure is applied, so it is reliable. In addition, it can be quickly pulled out, and the confirmation work at the time of construction can be performed easily and efficiently without much trouble.

  Next, as shown in FIG. 4, in the hot water storage type hot water supply apparatus, when the night time zone is reached, the hot water supply control unit 22 calculates the hot water storage amount necessary for the next day, and the target hot water storage amount is set at the end of the night time zone. The heating control unit 37 is instructed to boil until the heat pump circuit 30 is operated, and the circulation pump 32 of the heating circulation circuit 25 is started to be driven. 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 returned to the upper part of the hot water storage tank 7 through the heating circuit 25. As a result, 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 hot water has been stored, or when the thermal term inlet temperature sensor 34 detects a predetermined temperature or higher, the hot water supply control is performed. The unit 22 instructs the heating control unit 37 to stop the heating operation, the operations of the heat pump circuit 30 and the circulation pump 32 are stopped, and the hot water storage operation is completed by the end of the night time zone.

  When the hot water tap 3 is opened in this state, the hot water in the upper part of the hot water storage tank 7 is mixed with the hot water at the hot water discharge pipe 8 through the mixing valve 11 and supplied as hot water at a set temperature via the hot water supply pipe 12. The amount of water supplied by the hot water supply is supplied from the water supply pipe 9, the hot water is pushed up, and this is repeated in order to achieve good hot water supply.

Next, other embodiments shown in FIGS. 5 to 9 will be described. The same parts as those in this embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only differences will be described.
59 is a water supply sensor provided in the automatic air vent valve 38, which detects that the hot water storage tank 7 is full and water has reached the automatic air vent valve 38 using a float or a pair of electrodes. Thus, the automatic air vent valve 38 and the electric water stop cock 39 are closed to end the test operation mode.

Reference numeral 60 denotes an electric four-way valve that constitutes a flow path switching means, which is provided at a connection portion between the return pipe 24 and the return pipe 24 that bypasses the forward pipe 23 and the return pipe 24, and normally returns as shown in FIG. The pipes 24 communicate with each other, and when freezing is prevented, the return pipe 24 on the hot water flow path 33 side and the bypass path 54 are communicated as shown in FIG. This is to prevent freezing.
Reference numeral 62 denotes a flow sensor provided in the drain pipe 41, which completes air bleeding by detecting flowing water.

  Next, the operation will be described with reference to the flowchart shown in FIG. 7. When the test operation switch 46 of the remote controller 4 is pressed (step 51), a test start signal is output to the hot water supply control unit 22 in YES. In step 63, the automatic air vent valve 38 and the electric water stop valve 39 are opened.

  As a result, the hot water storage tank 7 starts water supply from the water supply pipe 9 through the electric water stop valve 39, and the air in the hot water storage tank 7 is sequentially pushed up by this water supply and escapes from the automatic air vent valve 38 communicating with the top. Therefore, it is possible to automatically and satisfactorily perform air bleeding and water filling in the hot water storage tank 7.

  Then, the process proceeds to step 64, waits for detection of water supply by the water supply sensor 59, proceeds to step 65 with YES, closes the automatic air vent valve 38 and the electric stop cock 39, and ends the test operation mode. 50, instead of the predetermined time of 50, when the hot water storage tank 7 is fully stopped by detecting the direct water supply, the full water supply can be detected reliably. For example, the water supply pressure and the water supply amount differ depending on the construction site. It can be used.

  Further, after the trial operation mode is completed, it is determined in step 55 whether or not the timer 50 has passed for a predetermined time, here 1 to 2 minutes, and the flow proceeds to step 66 in order to continue the air circulation of the heating circuit 25 with the electric four-way valve. 60 is connected to the return pipes 24, and the drain pipe 41 and the return pipe 24 on the outlet side of the hot water flow path 33 are brought into a communication state.

  As a result, the water supplied from the water supply pipe 9 flows through the bottom of the hot water storage tank 7 through the forward pipe 23 and from the hot water flow path 33 to the return pipe 24 and the drain pipe 41. The water from the drain pipe 41 flows into the drainage channel.

  In step 67, the flowing water at the time when the air bleeding is completed is detected by the flow sensor 62. If YES, the flow proceeds to step 68, the electric four-way valve 60 is returned to the normal state, and the air bleeding is terminated. It can reliably detect the completion of air venting and can reliably prevent wasteful drainage of water.

  In this embodiment, the heating means 2 is constituted by the heat pump circuit 30. However, the heating means 2 is not limited to this. For example, an electric heater is used as the heating means 2 to heat the hot water in the hot water storage tank 7. It can also be applied to water heaters.

  In addition, as a detection of full water due to air venting and water filling in the hot water storage tank 7, an automatic air vent valve 38 is set after a predetermined time has elapsed after the hot water temperature sensor 21 attached to the upper part of the hot water storage tank 7 detects the feed water temperature. It may be closed.

BRIEF DESCRIPTION OF THE DRAWINGS The air bleeding state schematic block diagram of the hot water storage type hot water supply apparatus which shows one Embodiment of this invention. The block diagram of the principal part electric circuit. The flowchart of the principal part. The schematic block diagram which shows the normal operation state. The schematic block diagram which shows the air bleeding operation state of other embodiment. The block diagram of the principal part electric circuit of the other embodiment. The flowchart of the principal part of the other embodiment. The schematic block diagram which shows the normal driving | running state of other embodiment. The schematic block diagram which shows the freezing prevention driving | running state of the other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 2 Heating means 4 Remote control 7 Hot water storage tank 8 Hot water discharge pipe 9 Water supply pipe 38 Automatic air vent valve 39 Electric stop valve 46 Test run switch 50 Timer 59 Water supply sensor

Claims (4)

  A hot water storage tank for storing hot water heated to high temperature by a heating means, a water supply pipe connected to the lower part of the hot water storage tank, a hot water discharge pipe connected to the upper part, and an automatic air vent valve connected to the top of the hot water storage tank At the same time, in the case where the water supply pipe is provided with an electric stop cock, the automatic air vent valve and the electric stop cock are automatically opened and closed at the time of a trial operation in which water is poured while bleeding the hot water storage tank. A hot water storage hot water supply device characterized by providing a trial operation mode.   The hot water storage type hot water supply apparatus according to claim 1, wherein the test operation mode is started by operating a test operation switch provided in a remote controller or a hot water storage tank unit.   The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the trial operation mode is ended by counting up a predetermined time of a timer for starting counting from the start of the trial operation.   The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein the trial operation mode is terminated by water supply detection by a water supply sensor provided in an automatic air vent valve.

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