JP6450231B2 - Water heater - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a hot water supply apparatus, and more specifically, driving of various valves such as a hot water mixing valve, a heat pump bypass, a bath three-way valve, a bath mixing valve, and an intermediate temperature water mixing valve provided in a flow path of the hot water supply apparatus. It is about control.

  Conventionally, regarding the drive control of various valves provided in this type of hot water supply apparatus, in Patent Document 1, from the operation of the drive means having a higher priority to the drive means of each valve, the operation of the lower-order drive means is sequentially performed. It is disclosed that the system is activated while maintaining a predetermined operation delay time. However, as described in the same document, when the operation of the driving means with higher priority is sequentially started from the operation of the lower driving means while maintaining a predetermined operation delay time, the power source capacity Even if there is a surplus, inconvenience that the hot water supply apparatus cannot be used smoothly may occur in order to prioritize the operation of the driving means having a high priority.

Japanese Patent Application Laid-Open No. 2003-176953

  Therefore, in the present invention, by providing an upper limit of drive means that can be used simultaneously, when the value is less than the upper limit value, priority is given to drive the drive means so that stable valve driving and effective use of the power source are achieved. An object of the present invention is to provide a hot water supply apparatus that can perform smooth hot water supply even when the capacity of the power source is reduced.

In order to solve the above-mentioned problems, the invention according to claim 1 divides a hot water flow channel connected to a heat source machine into a hot water supply side flow channel and a bath side flow channel, and water is supplied to the hot water supply side flow channel. A hot water supply mixing valve, a group of a plurality of flow path switching valves , and other valves , the hot water mixing valve, the plurality of flow path switching valves, and The other valves are valves driven by the same power source. The upper limit of the valves that can be driven simultaneously is two, and when there are three or more driving requests at the same time, the hot water mixing is performed. valves, wherein the plurality of flow path switching valve the valve in the group of the so as to be driven by priority of the other valve, and, among the valves in the group of the plurality of flow path switching valve after the previous drive request set as the priority according to the order, the group of the plurality of flow path switching valve The valve is characterized in that the one of the upper limit that can be simultaneously driven.
Further, in the invention according to claim 2 , in the invention according to claim 1 , when there is a drive request for the high priority valve while the low priority valve is in operation, the priority order The operation of the low valve is stopped, and after the operation of the high priority valve is finished, the stopped valve is driven.
The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the operation of the flow path switching valve belonging to the group of flow path switching valves is performed until the operation purpose of the valve ends. It is characterized by not stopping the operation.
Further, the invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the hot water supply side flow passage is placed from a position where intermediate temperature water of a hot water storage tank constituting the heat source unit is stored. Medium temperature hot water mixing valve connected via hot water flow path, bath mixing valve provided for mixing with water in the bath side flow path, and hot water from the bath is sent to the heating means side or the bath side a bath three-way valve for switching, said hot water from the heating means and the heat pump bypass valve for switching the sending to the hot water storage tank side or bypass side, comprises at least a group of said plurality of flow path switching valve The bath three-way valve and the heat pump bypass valve are included, and the other valves include the medium- temperature water mixing valve and the bath mixing valve .

  According to the present invention, by providing an upper limit of drive means that can be used simultaneously, when the value is less than or equal to the upper limit value, priority is given to drive the drive means to achieve stable valve driving and effective use of the power source. Can do. Further, it is possible to provide a compact hot water supply apparatus that can perform smooth hot water supply even when the capacity of the power source is reduced.

Explanatory drawing of the hot water supply apparatus of one embodiment of this invention Explanatory drawing of the power supply of the hot water supply device

An embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a schematic configuration diagram of a hot water supply apparatus. A cylindrical hot water storage tank 1 as a heat source device uses a heating means 2 comprising a heat pump unit using a carbon dioxide refrigerant to boil hot water by electricity and store hot water. It is. An upper flow path 3 is connected to the upper part of the hot water storage tank 1 to supply hot water from the heating means 2 to the hot water storage tank 1, and a return flow path 4 is connected to the bottom part to return low temperature water to the heating means. . In addition, a water supply passage 9 for replenishing water is connected to the bottom of the hot water storage tank 1 through a water supply tap 5 through a water supply stop cock 6, a pressure reducing valve and a strainer 7, and a check valve 8. A drain plug 10 is connected to the water supply channel 9. In the illustrated example, hot water from the heating means 2 is supplied to the hot water storage tank 1, but in the present invention, the heat source device does not exclude the one that heats the hot water storage tank 1 itself with fuel.
Connected to the upper part of the hot water storage tank 1 is a hot water discharge passage 13 for supplying the hot water stored in the hot water supply device 11 and the bath 12. The hot water flow path 13 is branched downstream into a hot water supply side flow path 14 and a bath side flow path 15, and the hot water supply side flow path 14 is connected to a hot water supply device 11. Via the bath 12.
The hot water supply flow path 14 is provided with a hot water supply mixing valve 16, a hot water supply flow rate sensor 17, a hot water supply thermistor 18, and a check valve 19 in order from the upstream side. The hot water mixing valve 16 is for mixing the hot water sent from the hot water flow path 13 and the water sent from the water tap 5, and is constituted by an electric three-way valve. The control means 20 uses the hot water supply temperature detected by the hot water supply thermistor 18, the hot water supply set temperature set by the remote controller 21 of the kitchen or bath tub, etc., and the detected water temperature sent from the water tap 5. The opening on the channel 13 side and the opening on the water supply channel 9 side are obtained, and the motor of the hot water mixing valve 16 is controlled so as to be at these openings. The hot water flow rate sensor 17 detects the flow rate of the hot water supply side flow path, and the check valve 19 is for preventing the back flow of hot water from the hot water supply device 11 side to the hot water storage tank 1 side.

The bath-side flow path 15 is provided with a bath mixing valve 22, a bath flow rate sensor 23, a hot water solenoid valve 24, and a bathing thermistor 25 in order from the upstream side. The bath mixing valve 22 is for mixing hot water sent from the hot water flow path 13 and water sent from the water tap 5, and is constituted by an electric three-way valve. The control means 20 performs bath mixing from the hot water supply temperature detected by a bath thermistor 25 provided on the downstream side of the bath mixing valve 22, the hot water set temperature set by a bath remote control or the like 26, and the water temperature. The opening degree of the valve 22 on the side of the hot water flow passage 13 and the opening degree on the side of the water supply passage 9 are obtained, and the motor of the bath mixing valve 22 is controlled so as to be at these opening degrees.
The hot water solenoid valve 24 is an electric valve configured to open when hot water is set by a remote controller 26 of the bath. Further, two check valves 27 and 28 are provided on the downstream side of the hot water solenoid valve 24 for the purpose of preventing the backflow of hot water in the bath 12. In addition, an air release valve 29 is provided in parallel with the flow path from the hot water solenoid valve 24 to the two check valves 27 and 28. The primary side of the air release valve 29 is connected between the bath mixing valve 22 and the bath flow sensor 23, and the secondary side is connected to a flow path between the check valves 27 and 28. As a result, when the water supply source pressure decreases due to water breakage or the like, the water supply pressure acting on the primary side of the air release valve 29 decreases, the valve opens, the secondary side and the drain pipe 30 communicate with each other, and the bathtub water is non-returned. Drain the water if it flows backward beyond the valves 27 and 28.

A bath heat exchanger 31 provided above the hot water storage tank 1 is connected to the bath 12 by a bath circulation circuit 32. The bath circulation circuit 32 is provided with a pump 33, which sends hot water absorbed from the bath 12 to the bath heat exchanger 31, performs heat exchange there, and returns to the bath 12. A water level sensor 34 is provided upstream of the pump 33 to detect the water level of the bath 12.
A bath three-way valve 35 and a bath thermistor 36 are provided on the downstream side of the pump 33. The bath three-way valve 35 is an electric flow path switching valve. When the bath water in the bath 12 needs to circulate, the bath three-way valve 35 switches the bath heat exchanger 31 in the hot water storage tank 1 to the return flow path 37 side so that the bath water does not circulate. use. For example, when checking the temperature of the bath water in the bath 12, it is necessary to circulate the bath water, but if the bath water circulates in the bath heat exchanger 31 at that time, unnecessary bath water In some cases, heating is performed. Moreover, it is necessary to prevent the bath circulation circuit from freezing in winter, and the bath heat exchanger 31 and the bath 12 are connected by periodically circulating the bath water remaining in the bath 12. Although the bath circulation circuit is prevented from freezing, the amount of heat in the hot water storage tank 1 is consumed in the freezing prevention operation unless it is switched to the return flow path 37 side. By circulating on the return flow path 37 side, the antifreezing operation is performed by circulating bath water without heating. The above-mentioned switching of the bath three-way valve 35 is performed via a predetermined program or the control means 20 manually.
In order to measure the temperature of the hot water in the hot water storage tank 1, a plurality of thermistors are provided at predetermined intervals from the upper side of the hot water storage tank 1, although not shown.
In the illustrated example, the bath heat exchanger 31 is described in the hot water storage tank 1, but the bath heat exchanger 31 may be disposed in the heating means 2.

  The hot water flow path 13 provided in the upper part of the hot water storage tank 1 branches into the bath side flow path 14 and the hot water supply side flow path 15, but before the hot water flow path 13 is branched, the upstream side of the hot water storage tank 1. In order, the intermediate warm water mixing valve 38 and the intermediate warm water thermistor 39 are provided. An intermediate warm water passage 40 is connected to a position below the hot water storage tank 1 and below the position where the hot water discharge passage 13 is connected. The intermediate warm water passage 40 is connected to the intermediate warm water mixing valve 38 via a check valve 41. Connected. The intermediate temperature water channel 40 discharges the intermediate temperature water whose temperature has been reduced by the heat exchange in the bath heat exchanger 31. The intermediate hot water mixing valve 38 mixes hot hot water supplied from the hot water flow path 13 and intermediate hot water supplied from the intermediate hot water flow path 40 and supplies the mixed hot water to the hot water flow path 13. The control means 20 uses the hot water in the hot water flow path 13 and the intermediate hot water flow path 40 at a temperature preset by the control means 20 from the temperature detected by the intermediate hot water thermistor 39 and the hot water temperature in the hot water flow path 13. The opening degree of the intermediate hot water mixing valve 38 on the side of the hot water flow passage 13 (on the hot water storage tank 1 side) and the opening degree of the valve on the intermediate hot water passage 40 side are controlled so that the intermediate warm water is mixed.

A heat pump type heating means 2 for heating hot water in the hot water storage tank 1 is configured so that hot water can circulate between the hot water storage tank 1. Here, the heat pump type heating means 2 includes a compressor, a water refrigerant heat exchanger, an expansion valve, and an air heat exchanger.
Hot water heated by the heating means 2 is supplied into the hot water storage tank 1 from the upper part of the hot water storage tank 1, and this flow path is branched halfway, and a heat pump bypass valve 42, which is a flow path switching valve, is branched. Is provided. The control means 20 compares the detected temperature on the upper side of the hot water storage tank 1 with the temperature of hot water supplied from the heating means 2, and if the hot water is not sufficiently heated by the heating means 2, The flow path is switched from the forward flow path 3 side to the hot water storage tank 1 side to the heat pump bypass flow path 43 that returns hot water to the lower part of the hot water storage tank 1 through the water supply flow path 9.

  The control means 20 is connected to a remote control 21 such as a kitchen or a remote control 26 in the bathroom, and has a counting function for controlling hot water supply, hot water filling in the bath 12, addition hot water, etc., means for storing values detected by various sensors, A microcomputer or the like is provided for comparing the set value, the detected value, etc. with the value stored in the storage means. In the present specification, it is assumed that there is a request for a valve or a group of valves including a control instruction from the remote control 21, 26 and a control instruction from the control means 20 itself.

Next, a power supply circuit for driving valves and the like constituting the apparatus will be described with reference to FIG.
As shown in FIG. 2, the commercial power supply 47 (200 V) is connected to the hot water solenoid valve 24 via a diode 48. The pump 33 for circulating the bath 12 is driven by a direct current of 280 V rectified by the diode 49. Further, the voltage of the commercial power supply 47 is stepped down by the transformer 50 to be DC voltages 5V, 12V and 15V, and the hot water mixing valve 16, the bath mixing valve 22, the bath three-way valve 35, the intermediate hot water mixing valve 38, and the heat pump bypass valve. The motor 42 is driven by 15V, the remote controllers 21 and 26 are driven by 12V, and the control means 20 is driven by 5V.
In the present embodiment, a hot water mixing valve 16 driven by the same power source, a bath mixing valve 22, an intermediate hot water mixing valve 38, a bath three-way valve 35 that is a flow path switching valve, and a heat pump bypass valve 42 are included. When drive requests from the control means 20 are generated simultaneously for three or more valves, the number of these valves 16, 22, 35, 38, and 42 is set to two or less as follows. Control by the control means.
That is, the hot water supply mixing valve 16, the bath three-way valve 35 and the heat pump bypass valve 42 that are the flow path switching valves included in the group, the bath mixing valve 22 that is the other valve, and the intermediate temperature water mixing valve 38 in this order. Drive with priority.
Further, it is preferable that only one valve is included in the group of the flow path switching valves when the valves are simultaneously driven. Even if the power supply capacity is a capacity capable of simultaneously driving a plurality of flow path switching valves in the group, when an interrupt of control of the hot water mixing valve 16 having a high priority occurs, If any one of the flow path switching valves is stopped, the flow path switching is stopped in a state where the purpose of the flow path switching cannot be achieved.
The priority order between the bath three-way valve 35 and the heat pump bypass valve 42, which are flow path switching valves included in the group, is set according to the order of drive requests within the group. Further, for the bath three-way valve 35 and the heat pump bypass valve 42 which are flow path switching valves belonging to this group, the operation of the valves is not stopped until the purpose of the operation of the valves is completed. This is because such control can surely fulfill the original role of the bath three-way valve 35 or the heat pump bypass valve 42.
As described above, since the driving priority of the valves 16, 22, 35, 38, and 42 is set, the valves are driven preferentially so that hot water is not supplied to the hot water supply side, and the power supply capacity Even in the case of a circuit that suppresses this, the power supply can be used effectively because there are two valves that can be driven simultaneously.
In addition, when the control means determines that there is a drive request for a valve with a high priority while the valve with a low priority is operating, the driving of the valve with a low priority is stopped and the valve with a high priority is It is preferable to drive the stopped valve after driving the valves and confirming with the control means that these drivings have been completed. This is because priority can be given to the operation with high priority in the hot water supply apparatus such as safety by giving priority to the driving of the valve with high priority.
Note that the group of the valves is not limited to the bath three-way valve 35 and the heat pump bypass valve 42, and a switching valve for switching the flow path is included in the group of the flow path switching valves.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Heating means 3 Outgoing flow path 4 Return flow path 5 Water supply tap 6 Water supply stop valve 7 Pressure reducing valve and strainer 8 Check valve 9 Water supply flow path 10 Drain plug 11 Hot water supply equipment 12 Bath 13 Hot water supply flow path 14 Hot water supply Side flow path 15 Bath side flow path 16 Hot water mixing valve 17 Hot water flow sensor 18 Hot water thermistor 19 Check valve 20 Control means 21 Remote control 22 Bath mixing valve 23 Bath flow sensor 24 Hot water solenoid valve 25 Bathing thermistor 26 Remote control 27 Check Valve 28 Check valve 29 Atmospheric release valve 30 Drain pipe 31 Bath heat exchanger 32 Bath circulation circuit 33 Pump 34 Water level sensor 35 Bath three-way valve 36 Bathing thermistor 37 Return flow path 38 Medium temperature water thermistor 40 Medium temperature water thermistor 40 Medium temperature water Flow path 41 Check valve 42 Heat pump bypass valve 43 Heat pump Bypass flow path 44 Relief valve 45 Stop cock 46 Emergency intake tap 47 Commercial power supply 48 Diode 49 Diode 50 Transformer

Claims (4)

A hot water mixing valve for branching a hot water flow path connected to the heat source machine into a hot water supply side flow path and a bath side flow path, and mixing with water in the hot water supply side flow path, and a group of a plurality of flow path switching valves When, and other valves, and at least the hot water supply device provided with,
The hot water mixing valve, the plurality of flow path switching valves, and the other valves are valves driven by the same power source , and the upper limit of the valves that can be driven simultaneously is two,
Of the valve, if there are three or more drive request at the same time, the hot water supply mixing valve, wherein the plurality of flow path switching valve the valve in the group of, so as to drive at the priority of the other valve In addition, among the valves in the group of the plurality of flow path switching valves , priority is given in accordance with the order of the drive requests .
The valve in the group of the plurality of flow path switching valves has a single upper limit that can be driven simultaneously . When there is a drive request for the high priority valve while the low priority valve is in operation, the low priority valve operation is stopped and the high priority valve operation is completed. 2. The hot water supply apparatus according to claim 1 , wherein the stopped valve is driven later. The hot water supply according to claim 1 or 2 , wherein the operation of the flow path switching valve belonging to the group of flow path switching valves does not stop the operation of the valve until the operation purpose of the valve is finished. apparatus. A medium temperature water mixing valve connected to the hot water supply side flow path through a medium temperature water flow path from a position where medium temperature water of the hot water storage tank constituting the heat source unit is stored,
A bath mixing valve provided to mix water with the bath-side channel;
A bath three-way valve for switching the sending hot water from the bath, the heating unit side or the bath side,
Comprising at least a heat pump bypass valve for hot water is switched to send the hot water storage tank side or bypass-side from the heating means,
The group of the plurality of flow path switching valves includes the bath three-way valve and the heat pump bypass valve,
The hot water supply apparatus according to any one of claims 1 to 3 , wherein the other valves include the intermediate temperature water mixing valve and the bath mixing valve .

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