WO2016046978A1

WO2016046978A1 - Hot-water supply and heating system

Info

Publication number: WO2016046978A1
Application number: PCT/JP2014/075703
Authority: WO
Inventors: 修平内藤; 泰成松村; 恭平飯田; 利幸佐久間
Original assignee: 三菱電機株式会社
Priority date: 2014-09-26
Filing date: 2014-09-26
Publication date: 2016-03-31
Also published as: EP3199884A4; JP6252685B2; JPWO2016046978A1; EP3199884B1; EP3199884A1

Abstract

Provided is a hot-water supply and heating system configured so that a single water pump is used in common for both heat storing operation and heating operation, wherein the temperature of hot water flowing into a hot-water storage tank can be increased during heat storing operation. A hot-water supply and heating system is provided with: a heat storing water passage by which a first water outlet 25 of a hot-water storage tank 2, a water pump 11, a water heater 100, and a first water inlet 26 of the hot-water storage tank 2 are connected in this order; a heating water passage by which a second water inlet 28 into which water returned from an external heating device enters, the water pump 11, the water heater 100, and a second water outlet 27 out of which water supplied to the heating device flows are connected in this order; and a switching valve 6 for switching between the heat storing water passage and the heating water passage. The heat storing water passage and the heating water passage have portions overlapping each other, and pressure loss in the heat storing water passage is higher than that in the heating water passage.

Description

Hot water heating system

The present invention relates to a hot water supply / heating system.

The hot water storage type heating device disclosed in Patent Document 1 below includes a heating circuit that connects heating means such as a heat pump and a hot water storage tank so that water can circulate, and water on the secondary side supplied to an external heater. A heat exchanger for heating, and a heat exchange circuit for connecting the heat exchanger and the heating means so that water can circulate are provided. This hot water storage type heating device includes distribution ratio adjusting means for adjusting the distribution ratio between the amount circulating in the hot water storage tank and the amount circulating in the heat exchanger at the branch point between the heating circulation circuit and the heat exchange circulation circuit.

Japanese Unexamined Patent Publication No. 2006-46800

The above-mentioned conventional hot water storage type heating apparatus does not directly supply hot water from the heating means to the external heating appliance, but supplies secondary hot water heated by the heat exchanger to the heating appliance. This hot water storage type heating device requires a pump for circulating hot water on the secondary side of the heat exchanger to the heating appliance in addition to the heating circulation pump for circulating water through the heating means.

Heat storage water circuit that performs heat storage operation that stores heat in the hot water storage tank by circulating water between the water heater and the hot water storage tank, and heating water that performs heating operation that circulates water between the water heater and an external heater If the circuit shares one water pump, the number of water pumps can be reduced and the cost can be reduced. However, when doing so, there are the following problems. In the heating water circuit, the length, number, connection method, and the like of the internal pipes and the heating appliances vary depending on the installation site. The pressure loss in the heating water circuit can be much higher than the pressure loss in the heat storage water circuit. Therefore, the performance of one water pump needs to be a performance that can satisfy the required flow rate in the heating water circuit having a high pressure loss. When water is circulated in a heat storage water circuit with low pressure loss using a water pump with such performance, water with a flow rate exceeding the appropriate flow rate circulates, and the temperature of hot water coming out of the water heater decreases, The temperature of hot water flowing into the hot water storage tank cannot be raised sufficiently.

The present invention has been made to solve the above-described problems. In a configuration in which one water pump is commonly used for a heat storage operation and a heating operation, the hot water flowing into the hot water storage tank during the heat storage operation is provided. An object of the present invention is to provide a hot water supply and heating system capable of increasing the temperature of the hot water.

The hot water supply and heating system of the present invention includes a hot water storage tank, a first water outlet through which water inside the hot water storage tank is discharged, a first water inlet through which water enters the hot water storage tank, a water heater that heats the water, and a water pump A first water outlet, a water pump, a water heater, a heat storage water path connecting the first water inlet in this order, a second water outlet from which water supplied to an external heater is discharged, and a heater A heating water path that connects the second water inlet, the second water inlet, the water pump, the water heater, and the second water outlet in this order, a heat storage water path, and a heating water path. A switching valve for switching, the heat storage water path and the heating water path have overlapping portions, and the pressure loss of the heat storage water path is higher than the pressure loss of the heating water path.

According to the hot water supply and heating system of the present invention, it is possible to increase the temperature of hot water flowing into the hot water storage tank during the heat storage operation in a configuration in which one water pump is commonly used for the heat storage operation and the heating operation. Become.

It is a block diagram which shows the hot-water supply heating system of Embodiment 1 of this invention. It is a figure which shows the circulation circuit of the water at the time of the heat storage driving | operation of the hot-water supply heating system of Embodiment 1 of this invention. It is a figure which shows the circulation circuit of the water at the time of the heating operation of the hot water supply heating system of Embodiment 1 of this invention. It is a figure which shows the structural example of a heating terminal. It is a figure which shows the structural example of a heating terminal. It is a figure which shows the structural example of a heating terminal. It is a figure which shows the structural example of a heating terminal. It is a longitudinal cross-sectional view of the upper pipe with which the hot-water supply heating system of Embodiment 1 of this invention is provided. It is a longitudinal cross-sectional view of the upper pipe with which the hot-water supply heating system of Embodiment 2 of this invention is provided. It is sectional drawing of the switching valve with which the hot-water supply heating system of Embodiment 3 of this invention is provided. It is sectional drawing of the switching valve with which the hot-water supply heating system of Embodiment 4 of this invention is provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted. In this specification, “water” is a concept including water of all temperatures from low-temperature cold water to high-temperature hot water.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water supply / heating system according to Embodiment 1 of the present invention. As shown in FIG. 1, the hot water supply and heating system 1 according to the first embodiment includes a water heater 100 and a tank unit 200. The water heater 100 and the tank unit 200 are connected via a first common pipe 9, a second common pipe 3, and electrical wiring (not shown). The hot water supply and heating system 1 according to the first embodiment has a configuration in which the water heater 100 and the tank unit 200 are separated, but in the present invention, the water heater 100 and the tank unit 200 may be integrated.

The water heater 100 according to the first embodiment is a heat pump type water heater. The water heater 100 includes a compressor 13 that compresses refrigerant, a water-refrigerant heat exchanger 15, a decompression device 16 that decompresses the refrigerant, and a low-temperature side heat exchanger that absorbs heat from a low-temperature heat source (for example, outside air). 17 (evaporator) and the refrigerant | coolant piping 14 which forms a refrigerant circuit by connecting these apparatuses cyclically | annularly. The water heater 100 heats water by operating a heat pump cycle (refrigeration cycle) with this refrigerant circuit. The water heater 100 heats water by exchanging heat between the high-temperature and high-pressure refrigerant compressed by the compressor 13 and water in the water-refrigerant heat exchanger 15.

The water heater in the present invention is not limited to the heat pump type water heater as described above, and may be of any type. For example, the water heater in the present invention may be a solar water heater that heats water with solar heat, or a combustion water heater that heats water with the combustion heat of fuel (eg, gas, kerosene, heavy oil, coal, etc.).

The tank unit 200 includes a hot water storage tank 2, a switching valve 6, and a water pump 11. Water is stored in the hot water storage tank 2. In the hot water storage tank 2, a temperature stratification can be formed in which the upper side is high temperature and the lower side is low temperature due to the difference in water density due to the temperature difference. A water supply pipe 18 is connected to the lower part of the hot water storage tank 2. Water supplied from a water source such as water is supplied into the hot water storage tank 2 through the water supply pipe 18. A hot water supply pipe 19 is connected to the upper part of the hot water storage tank 2. When hot water is supplied to the outside, the hot water stored in the hot water storage tank 2 is sent out to the hot water supply pipe 19.

The hot water storage tank 2 has a first water outlet 25 and a first water inlet 26. Water inside the hot water storage tank 2 comes out from the first water outlet 25. Hot water heated by the water heater 100 enters the hot water storage tank 2 from the first water inlet 26. The first water outlet 25 is in the lower part of the hot water storage tank 2. The first water inlet 26 is at the top of the hot water storage tank 2. The switching valve 6 has a first port 6a, a second port 6b, and a third port 6c. The switching valve 6 has a state in which the third port 6c is communicated with the first port 6a and the second port 6b is shut off, and a state in which the third port 6c is communicated with the second port 6b and the first port 6a is shut off. Can be switched to.

The lower pipe 8 connects between the first water outlet 25 of the hot water storage tank 2 and the upstream end of the first common pipe 9. The downstream end of the first common pipe 9 is connected to the water inlet of the water-refrigerant heat exchanger 15 of the water heater 100. A water pump 11 is connected in the middle of the first common pipe 9. In Embodiment 1, the water pump 11 is built in the tank unit 200. However, in the present invention, the water pump 11 may be installed on the water heater 100 side. The second common pipe 3 connects between the water outlet of the water-refrigerant heat exchanger 15 of the water heater 100 and the third port 6 c of the switching valve 6. The upper pipe 4 connects between the first port 6 a of the switching valve 6 and the first water inlet 26 of the hot water storage tank 2.

The heating terminal 12 is provided outside the water heater 100 and the tank unit 200. The tank unit 200 and the heating terminal 12 are connected via a first external pipe 22 and a second external pipe 23. The tank unit 200 has a second water outlet 27 and a second water inlet 28. The water supplied from the tank unit 200 to the heating terminal 12 goes out of the tank unit 200 through the second water outlet 27. The first internal pipe 5 connects between the second port 6 b of the switching valve 6 and the second water outlet 27 inside the tank unit 200. The upstream end of the first outer pipe 22 is connected to the second water outlet 27 from the outside of the tank unit 200. The downstream end of the first outer pipe 22 is connected to the entrance side of the heating terminal 12. The upstream end of the second external pipe 23 is connected to the outlet side of the heating terminal 12. The downstream end of the second outer pipe 23 is connected to the second water inlet 28 from the outside of the tank unit 200. The second inner pipe 7 connects between the second water inlet 28 and the upstream end of the first common pipe 9 inside the tank unit 200. Water returning from the heating terminal 12 to the tank unit 200 enters the tank unit 200 through the second water inlet 28.

The tank unit 200 incorporates the control unit 10. The control unit 10 and the remote controller 21 are connected so that they can communicate with each other. A user can input commands relating to the operation of the hot water supply and heating system 1 and changes in set values from the remote controller 21. Although not shown, the control unit 10 executes arithmetic processing based on a storage unit including a ROM (Read Only Memory), a RAM (Random Access Memory), and a nonvolatile memory, and a program stored in the storage unit. CPU (Central Processing Unit) that performs and an input / output port for inputting / outputting external signals to / from the CPU. The actuators and sensors included in the hot water supply / heating system 1 are electrically connected to the control unit 10. The control unit 10 controls the operation of the hot water supply / heating system 1 based on detection values of sensors, a signal from the remote controller 21, and the like. Although illustration is omitted, the remote controller 21 is equipped with a display unit for displaying information such as the state of the hot water supply / heating system 1, an operation unit such as a switch operated by a user, a speaker, a microphone, and the like.

A plurality of temperature sensors are attached to the surface of the hot water storage tank 2 at intervals in the vertical direction. The controller 10 can calculate the amount of stored hot water, the amount of stored heat, the amount of remaining hot water, etc. in the hot water storage tank 2 by detecting the temperature distribution in the vertical direction in the hot water storage tank 2 using these temperature sensors. The control unit 10 controls the timing of starting and stopping a heat storage operation, which will be described later, based on the amount of stored hot water, the amount of stored heat, or the amount of remaining hot water in the hot water storage tank 2.

Next, the heat storage operation of the hot water supply / heating system 1 will be described with reference to FIG. FIG. 2 is a diagram illustrating a water circulation circuit during the heat storage operation of the hot water supply and heating system 1 according to the first embodiment. The arrows in FIG. 2 indicate the direction in which water flows. In the heat storage operation, the switching valve 6 is controlled so that the third port 6c communicates with the first port 6a and the second port 6b is shut off, and the water pump 11 is driven. In the heat storage operation, the low-temperature water in the lower part of the hot water storage tank 2 passes through the first water outlet 25, the lower pipe 8, and the first common pipe 9 and is sent to the water-refrigerant heat exchanger 15 of the water heater 100. Water heated to a high temperature by being heated by the water-refrigerant heat exchanger 15 is supplied to the second common pipe 3, the third port 6c of the switching valve 6, the first port 6a, the upper pipe 4, and the first It passes through the water inlet 26 and flows into the upper part of the hot water storage tank 2. In the heat storage operation, as the water circulates as described above, high temperature water is stored in the hot water storage tank 2 from the top to the bottom, and the amount of heat stored in the hot water storage tank 2 increases.

The water circulation circuit during the heat storage operation described above is referred to as a “heat storage water circuit”. From the first water outlet 25, the lower pipe 8, the first common pipe 9, the water-refrigerant heat exchanger 15, the second common pipe 3, the third port 6c of the switching valve 6, the first port 6a, and the upper pipe A path that passes through 4 and reaches the first water inlet 26 is referred to as a “heat storage water path”.

Next, the heating operation of the hot water supply / heating system 1 will be described with reference to FIG. FIG. 3 is a diagram illustrating a water circulation circuit during the heating operation of the hot water supply and heating system 1 according to the first embodiment. The arrows in FIG. 3 indicate the direction in which water flows. In the heating operation, the switching valve 6 is controlled so that the third port 6c communicates with the second port 6b and the first port 6a is shut off, and the water pump 11 is driven. In the heating operation, water heated by the water-refrigerant heat exchanger 15 of the water heater 100 is supplied from the second common pipe 3, the third port 6c of the switching valve 6, the second port 6b, the first inner pipe 5, the second It passes through the water outlet 27 and the first outer pipe 22 and is sent to the heating terminal 12. And this water falls in temperature by the heat terminal 12 being deprived of heat by indoor air or a floor. The water whose temperature has decreased is returned to the water-refrigerant heat exchanger 15 of the water heater 100 through the second outer pipe 23, the second water inlet 28, the second inner pipe 7, and the first common pipe 9. The water returned to the water-refrigerant heat exchanger 15 is reheated and recirculated.

The water circulation circuit during the heating operation described above is referred to as a “heating water circuit”. Further, from the second water inlet 28, the second inner pipe 7, the first common pipe 9, the water-refrigerant heat exchanger 15, the second common pipe 3, the third port 6c of the switching valve 6, the second port 6b, A path that passes through the first inner pipe 5 and reaches the second water outlet 27 is referred to as a “heating water path”. The switching valve 6 can switch between the heat storage water path and the heating water path.

The first common pipe 9, the water-refrigerant heat exchanger 15, the second common pipe 3, and the third port 6c correspond to overlapping portions where the heat storage water path and the heating water path overlap. The first common pipe 9 and the second common pipe 3 correspond to pipes that form this overlapping portion. The upper pipe 4 and the lower pipe 8 correspond to pipes forming a heat storage water path other than the overlapping part. The 1st internal pipe 5 and the 2nd internal pipe 7 are corresponded to the pipe | tube which forms the heating water path | routes other than this overlapping part.

The heating terminal 12 includes one or a plurality of heating appliances 24. By flowing water heated by the water heater 100 to the heater 24, the temperature of the indoor air is raised. As the heating appliance 24, for example, at least one of a floor heating panel installed under the floor, a radiator or panel heater installed on an indoor wall surface, and a fan convector can be used. The fan convector includes a blower for circulating indoor air and a heat exchanger for exchanging heat of indoor air and liquid, and performs heating by forced convection. When the heating terminal 12 includes a plurality of heating appliances 24, the types thereof may be the same or different.

Depending on the type of the heating terminal 12, a plurality of heating appliances 24 may be incorporated. Moreover, the some heating terminal 12 may be connected in parallel. For each installation site of the heating terminal 12, the length, number, and connection method of the internal piping of the heating terminal 12, the length, number, and connection method of the heating appliance 24 are variously different. 4-7 is a figure which shows the structural example of the heating terminal 12. As shown in FIG. In FIG. 4 to FIG. 7, for the sake of convenience, an uppercase alphabet is added to the reference numeral of the heating terminal 12 for distinction. A heating terminal 12 </ b> A shown in FIG. 4 includes a single heating appliance 24. The heating terminal 12 of FIGS. 5 to 7 includes a plurality of heating appliances 24. In FIG. 5 to FIG. 7, for the sake of convenience, a lowercase alphabet is added to the reference numerals of the heating appliances 24 to distinguish them.

The heating terminal 12B shown in FIG. 5 includes five

heating appliances

24a, 24b, 24c, 24d, and 24e.

Heating appliances

24c and 24d are connected in series.

Heating appliances

24a, 24b, and 24e are connected in parallel to the

heating appliances

24c and 24d, respectively.

The heating terminal 12C shown in FIG. 6 includes five

heating appliances

24a, 24b, 24c, 24d, and 24e, and the connecting method is the same as that of the heating terminal 12B in FIG. However, in the heating terminal 12C shown in FIG. 6, the length of the internal pipe connected to the heating appliance 24e is longer than that of the heating terminal 12B in FIG.

In the configuration example shown in FIG. 7, two

heating terminals

12D and 12E are connected in parallel to the first outer pipe 22 and the second outer pipe 23. The heating terminal 12D includes four

heating appliances

24a, 24b, 24c, and 24d. The

heating appliances

24a and 24b connected in series are connected in parallel to the

heating appliances

24c and 24d connected in series. The heating terminal 12E includes five

heating appliances

24e, 24f, 24g, 24h, and 24i. The

heating appliances

24g and 24h are connected in series.

Heating appliances

24e, 24f, and 24i are connected in parallel to the

heating appliances

24g and 24h, respectively.

When the heating terminal 12 as shown in FIG. 5 to FIG. 7 is connected, the pressure loss of the heating water circuit may be much higher than the pressure loss of the heat storage water circuit. The pressure loss corresponds to an energy loss per unit time unit flow rate when the fluid flows. For internal flows such as piping, pressure loss is defined as the difference between the total inlet pressure and the total outlet pressure.

In the hot water supply and heating system 1 of the first embodiment, the heat storage water circuit and the heating water circuit share one water pump 11. That is, a dedicated water pump is not required for the heating water circuit. Therefore, the number of water pumps can be reduced and the cost can be reduced. The performance (lift) of the water pump 11 is such that the required flow rate in the heating water circuit with high pressure loss can be satisfied (lift). If the water pump 11 is used to circulate water in a heat storage water circuit having a low pressure loss, water having a flow rate exceeding an appropriate flow rate may be circulated. If the circulating flow rate of water during the heat storage operation exceeds an appropriate flow rate, the temperature of the hot water coming out of the water heater 100 is lowered, and the temperature of the hot water flowing into the hot water storage tank 2 cannot be sufficiently increased.

In the hot water supply and heating system 1 according to the first embodiment, the pressure loss in the heat storage water path from the first water outlet 25 to the first water inlet 26 is detected in the heating water path from the second water inlet 28 to the second water outlet 27. Higher than pressure loss. FIG. 8 is a vertical cross-sectional view of the upper pipe 4 provided in the hot water supply / heating system 1 of the first embodiment. As shown in FIG. 8, a narrowed portion 30 is provided inside the upper tube 4. The cross-sectional area of the narrowed portion 30 is smaller than the cross-sectional areas of the first common pipe 9 and the second common pipe 3. The flow path cross-sectional area of the narrowed portion 30 is smaller than the flow path cross-sectional areas of the first inner pipe 5 and the second inner pipe 7. The narrowed portion 30 is a cylindrical member having an outer diameter substantially equal to the inner diameter of the upper tube 4. The narrowed portion 30 is fixed inside the upper tube 4.

By providing the constricted portion 30 in the upper pipe 4 that forms the heat storage water path other than the overlapping part of the heat storage water path and the heating water path, the pressure loss of the heat storage water path is reduced to the pressure loss of the heating water path with a simple configuration. Higher than that. During the heat storage operation, a high pressure loss occurs due to water passing through the constricted portion 30. Since water does not pass through the constriction 30 during heating operation, high pressure loss due to the constriction 30 does not occur. During the heat storage operation, a high pressure loss due to the constricted portion 30 is generated, so that the circulation flow rate of the heat storage water circuit can be suppressed. For this reason, the circulation flow rate of water during the heat storage operation can be suppressed to an appropriate flow rate, and the temperature of hot water coming out of the water heater 100 can be sufficiently increased. As a result, the temperature of hot water stored in the hot water storage tank 2 can be sufficiently increased. During heating operation, a high pressure loss due to the constriction 30 is not generated, so that a necessary flow rate in the heating water circuit can be sufficiently secured.

In the first embodiment, the constricted portion 30 is provided in the upper pipe 4. However, the present invention is not limited to such a configuration, and the lower pipe 8 that forms a heat storage water path other than the overlapping part of the heat storage water path and the heating water path. The constriction 30 may be provided in Even in that case, the above-described effect can be obtained.

In the first embodiment, the narrow tube 30 is provided in the upper tube 4 and the narrow tube 30 is not provided in the lower tube 8. This has the following effects. When the hot water supply / heating system 1 is repaired or when the use of the hot water supply / heating system 1 is stopped, the water in the hot water storage tank 2 may be drained and emptied. A configuration in which a drain plug (not shown) for performing such drainage is connected to the first common pipe 9 or the second inner pipe 7 is conceivable. In such a configuration, when the drain plug is opened, the water in the hot water storage tank 2 is discharged from the drain plug through the lower pipe 8. When the narrowed portion 30 is provided in the lower pipe 8, it takes a long time to drain water from the hot water storage tank 2. In contrast, in the first embodiment, the narrow pipe 30 is provided in the upper pipe 4 and the narrow pipe 30 is not provided in the lower pipe 8, so that it takes time to drain the water in the hot water storage tank 2. Will not be long.

The water pump 11 may have a variable rotation speed. In that case, as the water pump 11, for example, a pump provided with a pulse width modulation control (PWM control) type DC motor whose rotation speed can be changed by a speed command voltage from the control unit 10 can be preferably used. When the pressure loss of the heat storage water path is equal to or less than the pressure loss of the heating water path, even if the rotation speed of the water pump 11 is controlled to the minimum speed, the circulation flow rate of water during the heat storage operation exceeds an appropriate flow rate. Sometimes. On the other hand, in this Embodiment 1, the pressure loss of the heat storage water path is made higher than the pressure loss of the heating water path, so that the circulation flow rate of water during the heat storage operation is surely suppressed to an appropriate flow rate. Can do.

In the hot water supply and heating system 1, when the pressure loss value of the heat storage water path is P1, and the pressure loss value of the heating water path is P2, the value of P1 / P2 is preferably 2.0 or more, and is 2.4 or more. Is more preferable. Further, the value of P1 / P2 is preferably 6.0 or less, and more preferably 4.3 or less. By setting the value of P1 / P2 within such a range, it is possible to suppress an increase in power consumption of the water pump 11 while reliably suppressing the circulating flow rate of water during the heat storage operation to an appropriate flow rate.

When selecting the water pump 11 used in the hot water supply and heating system 1, the pressure loss of the heating water circuit when the heating terminal 12 having various configurations as described above is used is actually measured or calculated, and the first The pressure loss of the heat storage water circuit that changes according to the lengths of the common pipe 9 and the second common pipe 3 is measured or calculated. Even in a configuration in which the pressure loss of the heating water circuit is assumed to be maximum in the actual measurement or the calculation, the maximum head is set so that the circulating flow rate of the water in the heating water circuit can be set to a predetermined value (for example, 10 liters per minute). A water pump 11 is selected. Further, even in the configuration in which the pressure loss of the heat storage water circuit is assumed to be the minimum in the above actual measurement or trial calculation, the minimum head that can make the circulation flow rate of the water in the heat storage water circuit to an intended value (for example, 1 liter per minute). A water pump 11 is selected. In general, as the head width of the water pump 11 (difference between the maximum head and the minimum head) is increased, the size of the water pump 11 increases, and the installation space required for the water pump 11 increases. By making the value of P1 / P2 within the range as described above, it is ensured that the size of the water pump 11 becomes excessive while reliably suppressing the circulating flow rate of water during the heat storage operation to an appropriate flow rate. Can be suppressed.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 9. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted. FIG. 9 is a longitudinal sectional view of the upper pipe 4 provided in the hot water supply and heating system 1 according to the second embodiment.

The flow path cross-sectional area of the upper pipe 4 shown in FIG. 9 is smaller than the flow path cross-sectional areas of the first common pipe 9 and the second common pipe 3, and the flow breaks of the first internal pipe 5 and the second internal pipe 7 Smaller than the area. The upper pipe 4 of the second embodiment is narrower than the first common pipe 9 and the second common pipe 3 and is thinner than the first inner pipe 5 and the second inner pipe 7. In the first embodiment, by using such a thin upper tube 4, the upper tube 4 itself forms a constricted portion. For this reason, another member like the constriction part 30 of Embodiment 1 becomes unnecessary, and cost can be reduced. Hot water supply and heating system 1 of the second embodiment has the same effects as those of the first embodiment. Since the upper pipe 4 itself forms a constricted portion, the pressure loss of the heat storage water path can be made higher than the pressure loss of the heating water path with a simple configuration.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 10. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted. FIG. 10 is a cross-sectional view of the switching valve 6 provided in the hot water supply and heating system 1 of the third embodiment.

As shown in FIG. 10, the switching valve 6 includes a movable element 32 and a storage element that stores the movable element 32. The movable element 32 is, for example, a substantially spherical ball valve body. The movable element 32 has an L-shaped through channel 34. Both ends of the through channel 34 open to the surface of the movable element 32. The movable element 32 is rotatable around a rotation axis perpendicular to the paper surface of FIG. When the movable element 32 is configured to be rotated by a stepping motor (not shown), the rotation angle of the movable element 32 can be easily controlled.

The storage element of the switching valve 6 has a first port 6a, a second port 6b, a third port 6c, an O-ring 31, and a seal member 33. The O-ring 31 and the seal member 33 are provided for each of the first port 6a, the second port 6b, and the third port 6c. The seal member 33 prevents liquid leakage from the gap between the seal member 33 and the movable element 32 by contacting the surface of the movable element 32. The O-ring 31 prevents liquid leakage from the gaps between the first port 6a, the second port 6b, the third port 6c, and the respective seal members 33. FIG. 10 shows a state where the control unit 10 switches the switching valve 6 to the heat storage water path. In this state, the first port 6 a and the third port 6 c communicate with each other through the through flow path 34. In this state, the second port 6b is blocked by the surface of the movable element 32 coming into contact with the seal member 33 provided in the second port 6b.

A constriction 30 is provided inside the first port 6a of the switching valve 6. The channel cross-sectional area of the constricted portion 30 is smaller than the channel cross-sectional area of the second port 6b. The narrowed portion 30 is a cylindrical member having an outer diameter substantially equal to the inner diameter of the first port 6a. The narrowed portion 30 is fixed inside the first port 6a. By providing the narrowed portion 30, the pressure loss of the first port 6a is made higher than the pressure loss of the second port 6b. Thus, the pressure loss of the heat storage water path can be reduced with a simple configuration by making the pressure loss of the first port 6a connected to the heat storage water path higher than the pressure loss of the second port 6b connected to the heating water path. Higher than the pressure loss in the heating water path. Hot water supply and heating system 1 of the third embodiment has the same effects as those of the first embodiment. The narrowed portion 30 may be formed integrally with the first port 6a.

Embodiment 4 FIG.
Next, the fourth embodiment of the present invention will be described with reference to FIG. 11. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted. FIG. 11 is a cross-sectional view of the switching valve 6 provided in the hot water supply and heating system 1 of the fourth embodiment. FIG. 11 shows a state where the control unit 10 switches the switching valve 6 to the heat storage water path.

The switching valve 6 includes a movable element 32 and a storage element that stores the movable element 32. The movable element 32 is, for example, a substantially spherical ball valve body. The movable element 32 has an L-shaped through channel 34. Both ends of the through channel 34 open to the surface of the movable element 32. The movable element 32 is rotatable around a rotation axis perpendicular to the paper surface of FIG. The storage element of the switching valve 6 includes a first port 6 a, a second port 6 b, a third port 6 c, an O-ring 31, and a seal member 33. The O-ring 31 and the seal member 33 are provided for each of the first port 6a, the second port 6b, and the third port 6c. The seal member 33 prevents liquid leakage from the gap between the seal member 33 and the movable element 32 by contacting the surface of the movable element 32. The O-ring 31 prevents liquid leakage from the gaps between the first port 6a, the second port 6b, the third port 6c, and the respective seal members 33.

When the switching valve 6 is switched to the heat storage water path, as shown in FIG. 11, a part of the opening at both ends of the through channel 34 of the movable element 32 is blocked by the seal member 33 of the storage element. A part of the opening at one end of the through channel 34 is closed by a seal member 33 provided in the first port 6a. A part of the opening at the other end of the through channel 34 is closed by a seal member 33 provided in the third port 6c.

In the fourth embodiment, when the switching valve 6 is switched to the heat storage water path, a part of the opening at both ends of the through channel 34 of the movable element 32 is blocked by the seal member 33, so that the water channel Is squeezed and high pressure loss occurs. Therefore, the pressure loss of the heat storage water path can be made higher than the pressure loss of the heating water path. The hot water supply and heating system 1 of the fourth embodiment has the same effects as those of the first embodiment. According to the fourth embodiment, the same effect as in the first embodiment can be obtained by controlling the rotation angle of the movable element 32, so that it is not necessary to add a new part, and the cost can be reduced.

Although illustration is omitted, when the control unit 10 switches the switching valve 6 to the heating water path, the opening of both ends of the through channel 34 of the movable element 32 is not blocked by the seal member 33. The rotational position is controlled. That is, when the switching valve 6 is switched to the heating water path, the entire opening at one end of the through passage 34 overlaps the central hole of the seal member 33 provided in the second port 6b, and the through passage 34 The entire opening at the other end overlaps the central hole of the seal member 33 provided in the third port 6c. When the switching valve 6 is switched to the heating water path, no high pressure loss occurs.

As mentioned above, although embodiment of this invention was described, in this invention, you may implement combining several embodiment mentioned above arbitrarily.

1 hot water supply / heating system, 2 hot water storage tank, 3rd common pipe, 4 upper pipe, 5 first internal pipe, 6 switching valve, 6a first port, 6b second port, 6c third port, 7 second internal pipe, 8 lower pipe, 9 first common pipe, 10 control unit, 11 water pump, 12, 12A, 12B, 12C, 12D, 12E heating terminal, 13 compressor, 14 refrigerant piping, 15 refrigerant heat exchanger, 16 decompression device, 17 Low temperature side heat exchanger, 18 water supply pipe, 19 hot water supply pipe, 21 remote controller, 22 first external pipe, 23 second external pipe, 24, 24a, 24b, 24c, 24d, 24e, 24f, 24g, 24h, 24i Heating appliance, 25 1st water outlet, 26 1st water inlet, 27 2nd water outlet, 28 2nd water inlet, 30 constricted part, 31 O-ring, 32 movable elements, 3 Sealing member, 34 through channel, 100 water heater, 200 tank unit

Claims

A hot water storage tank,
A first water outlet through which water inside the hot water storage tank comes out;
A first water inlet through which water enters the hot water storage tank;
A water heater to heat the water,
A water pump,
A heat storage water path connecting the first water outlet, the water pump, the water heater, and the first water inlet in this order;
A second water outlet through which the water supplied to the external heating appliance comes out;
A second water inlet into which water returned from the heating appliance enters;
A heating water path connecting the second water inlet, the water pump, the water heater, and the second water outlet in this order;
A switching valve for switching between the heat storage water path and the heating water path;
With
The heat storage water path and the heating water path have overlapping portions,
The hot water supply and heating system in which the pressure loss of the heat storage water path is higher than the pressure loss of the heating water path.
2. The hot water supply according to claim 1, wherein a tube forming the heat storage water path other than the overlapping portion is provided with a narrowed portion, and a flow passage cross-sectional area of the narrowed portion is smaller than a flow passage cross-sectional area of the pipe forming the overlapping portion. Heating system.
The first water outlet is at the bottom of the hot water storage tank,
The first water inlet is at the top of the hot water storage tank;
The heat storage water path other than the overlapping portion includes a lower pipe connected to the first water outlet and an upper pipe connected to the first water inlet,
The hot water supply and heating system according to claim 2, wherein the narrowed portion is not in the lower pipe but in the upper pipe.
The switching valve is
A first port connected to the heat storage water path;
A second port connected to the heating water path;
A constriction that increases the pressure loss of the first port compared to the pressure loss of the second port;
A hot water supply / heating system according to claim 1.
The switching valve is
A movable element having a through channel, the through channel being open to the surface;
A storage element having a plurality of ports and storing the movable element;
With
The hot water supply and heating system according to claim 1, wherein when the switching valve is switched to the heat storage water path, a part of the opening of the through passage of the movable element is blocked by the storage element.