JP6756973B2 - Hot water storage and hot water supply device - Google Patents

Description

The present invention relates to a hot water storage and hot water supply device, and more particularly to a hot water storage and hot water supply device capable of preventing overshoot of the hot water temperature due to a pressure increase in a hot water discharge passage.

Conventionally, hot water heated by a heat source machine such as a gas combustion type heat source machine, a heat pump type heat source machine, or a fuel cell power generation device is stored in a hot water storage tank and supplied to a desired hot water supply destination (hot water tap, bathtub, heating terminal, etc.). Hot water storage and hot water supply equipment is widely used in general.

This heat pump type hot water storage device includes a heat pump type heat source machine that heats hot water with a refrigerant, a hot water storage tank that stores the heated hot water, a hot water circulation pipe that circulates hot water between the heat pump type heat source machine and the hot water storage tank, and high temperature heating. Equipped with a gas combustion type auxiliary heat source machine that discharges hot water at high temperature and backs up the output of the heat source machine when using a terminal or bath reheating, and circulates the hot water in the hot water storage tank to the hot water circulation pipe to condense the heat pump type heat source machine. In the heat exchanger, heat is exchanged between the refrigerant and hot water to heat the hot water, and if necessary, the hot water and tap water from the hot water storage tank are heated by the auxiliary heat source machine and supplied to the hot water outlet passage.

A hot water outlet is connected to the upper part of the hot water storage tank, and a water supply passage is connected to the lower part of the hot water storage tank, and hot water is supplied at a set temperature by mixing high-temperature water and low-temperature clean water supplied from the hot water storage tank. A hot water mixing valve for this operation and a bypass passage branched from the water supply passage and connected to the hot water mixing valve are provided.

A mixing valve inlet thermista that detects the temperature of the hot water at the inlet of the mixing valve and a water inlet thermista that detects the temperature of the tap water in the water supply passage are provided, and the hot water temperature, the tap water temperature, and the hot water supply set temperature from the operation remote control are provided. A mixing ratio setting table for setting the mixing ratio in the mixing valve is stored in the control unit with the above as a parameter, and normally, the mixing ratio of hot water and clean water in the mixing valve is set to the hot water temperature, the clean water temperature, and the hot water supply set temperature. It is set based on the above mixing ratio setting table.

In Patent Document 1, in a heat pump type hot water storage device, a high temperature hot water storage tank, a high temperature hot water discharge passage for hot water from the high temperature hot water storage tank, a low temperature hot water storage tank, and a low temperature hot water discharge passage for hot water from the low temperature hot water storage tank are provided. By providing an intervening low-temperature hot water passage and supplying hot water to the mixing valve from the confluence where the high-temperature hot water passage and the low-temperature hot water passage are directly merged, the confluence of the high-temperature hot water passage and the low-temperature hot water passage The mixing valve provided in the above can be omitted.

Japanese Unexamined Patent Publication No. 2008-309351

When the auxiliary heat source machine is burned to supply high-temperature hot water to the high-temperature heating circuit, or when hot water is re-released after the hot water supply is stopped, the auxiliary heat source machine is installed immediately after the hot water supply is stopped in order to alleviate the undershoot of the hot water supply temperature. When hot water is stored by burning, or when hot water is stored by a heat pump heat source machine, the pressure in the hot water passage increases due to the thermal expansion of the hot water.
In this way, if the tip plug (curan) is opened while the pressure in the hot water passage is rising, the problem is that the hot water temperature overshoots momentarily due to the pushing of hot water in the hot water passage immediately after that. There is.

That is, since the mixing ratio setting table for setting the mixing ratio in the mixing valve is created on the assumption that the pressures of the hot water and the clean water are the same, it is appropriate if the pressure balance between the hot water and the clean water is lost. Since it is not possible to set a suitable mixing ratio, it is not possible to discharge hot water at the hot water supply set temperature, and overshoot occurs at the hot water discharge temperature as described above.

The technique of Patent Document 1 is intended to omit the mixing valve at the confluence of the low temperature hot water outlet passage and the high temperature hot water outlet passage, and does not focus on the above problem.
An object of the present invention is to provide a hot water storage hot water supply device capable of preventing the overshoot of the hot water temperature due to an increase in pressure in the hot water passage.

The hot water storage device according to claim 1 includes a hot water storage tank, a hot water supply passage connected to the upper part of the hot water storage tank, a water supply passage connected to the lower part of the hot water storage tank, and high temperature water supplied from the hot water supply passage. A hot water mixing means for mixing low-temperature clean water to supply hot water at a set temperature, a bypass passage branched from the water supply passage and connected to the hot water mixing means, and a hot water temperature of the hot water outlet passage. In a hot water storage and hot water supply device provided with a temperature detecting means for detecting and a check valve provided downstream of a branch portion of the water supply passage and each of the bypass passages, a joint connection portion of a pipe member forming the hot water outlet passage is provided. , The pipe member is horizontally connected to the end of the hot water mixing means, the pipe member extends in the horizontal direction and then rises vertically upward, and the temperature detecting means is attached to the vertical portion, and the temperature detecting means and the said orifice is provided in the tapping passage between the hot and cold water mixing device, the orifice is characterized by being formed by diameter the passage hole of the joint connecting portion of the pipe member.

According to the invention of claim 1, since the orifice is provided in the hot water passage between the temperature detecting means for detecting the temperature of the hot water in the hot water passage and the hot water mixing means, the pressure of the hot water in the hot water passage is high. When the tip plug is opened, even if the mixing ratio is not set properly based on the mixing ratio setting table, the flow rate of high-temperature hot water is throttled by the orifice, so that the hot water temperature when the hot water is discharged from the front plug is exceeded. Shoots are less likely to occur.
Moreover, since the orifice is arranged between the temperature detecting means and the hot water mixing means, there is no possibility that the temperature detection accuracy of the temperature detecting means will be lowered due to the influence of the turbulent flow generated in the vicinity of the orifice.

Since the orifice is arranged below the temperature detecting means, the adverse effect on the temperature detection by the temperature detecting means due to the turbulence and convection in the vicinity of the orifice is further reduced.

Further, since the orifice is formed by reducing the diameter of the passage hole of the joint connection portion of the pipe member forming the hot water passage , the number of parts is reduced as compared with the case where the orifice is composed of separate parts. , The production cost can be reduced.

It is a block diagram of the hot water storage hot water supply apparatus which concerns on embodiment of this invention. It is sectional drawing of the mixing valve and the pipe member connected to it.

Hereinafter, embodiments for carrying out the present invention will be described based on examples.

The configuration of the heat pump type hot water storage and hot water supply device 1 will be described.
As shown in FIG. 1, the hot water storage and hot water supply device 1 includes a hot water storage and hot water supply unit 2 having an auxiliary heat source machine 4, and a heat pump heat source machine 3.

The hot water storage unit 2 supplies hot water to the hot water supply destination by being connected to the auxiliary heat source machine 4, the hot water storage tank 5 for storing hot water, the hot water outlet 6 connected to the upper end of the hot water storage tank 5, and the hot water outlet 6. The hot water supply passage 7, the hot water pouring passage 8 that branches from the hot water supply passage 7 and fills the tub 13A with hot water, and the hot water in the hot water storage tank 5 are heated by the heat pump heat source machine 3 and circulated so as to be stored in the hot water storage tank 5. A circulation circuit 9, a water supply passage 10 for supplying clean water to the hot water storage tank 5, a mixing valve 16 for mixing hot water and clean water, and a heat exchanger 12 for reheating the hot water in the tub 13A. , A reheating hot water passage 31 that branches from the auxiliary hot water passage 14c and supplies hot water to the heat exchanger 12, a reheating circuit 13, a heat exchanger 27 for heating, and a heat exchanger 27 that branches from the auxiliary hot water passage 14c. A control unit that performs various controls, such as a heating hot water passage 29 for supplying hot water, a heat medium passage 28a for high temperature heating, a heat medium passage 28b for low temperature heating, a heat medium return passage 28c, and a hot water return passage 32. 11 and an operation remote control 60 and the like are provided.

A plurality of temperature sensors 5a to 5d are provided on the side of the hot water storage tank 5 at appropriate intervals to detect the temperature of the stored hot water. The periphery of the hot water storage tank 5 is covered with a heat insulating material (not shown) in order to prevent the temperature of the stored hot water from falling.

The water supply passage 10 supplies low-temperature clean water from the clean water source to the hot water storage tank 5 and the like, and the upstream end is connected to the clean water source and the downstream end is connected to the lower end of the hot water storage tank 5. The water supply bypass passage 18 is branched from the water supply passage 10 and connected to the mixing valve 16. A water supply temperature sensor 19 is provided in the water supply passage 10, a check valve 20 is provided on the downstream side of the branch portion, and a check valve 21 is provided in the water supply bypass passage 18. A high-temperature hot water outlet avoidance passage 22 branched from the water supply bypass passage 18 and connected to the hot water supply passage 7 is provided so as to avoid high-temperature hot water discharge.

The upstream end of the hot water outlet passage 6 is connected to the upper end of the hot water storage tank 5, the downstream end is connected to the mixing valve 16, and the hot water supply passage 7 is connected to the mixing valve 16. On the downstream side of the confluence of the auxiliary hot water passage 14c and the hot water passage 6 for discharging high-temperature hot water from the auxiliary combustor 4, the hot water temperature sensor 43 is interposed in the hot water passage 6 and the upstream side of the mixing valve 16. An orifice 44 located in the vicinity is interposed.

The mixing valve 16 supplies hot water at a temperature (hot water supply set temperature) set by the user via the operation remote controller 60 to the hot water supply passage 7, or supplies hot water at the hot water supply set temperature to the tub 13A. The mixing ratio of the low-temperature clean water supplied from 18 and the high-temperature hot water supplied from the hot water outlet 6 is adjusted. The hot water adjusted to the set temperature is supplied to the hot water tap from the hot water supply passage 7, or is supplied to the bathtub 13A from the hot water pouring passage 8. A hot water supply temperature sensor 23 and a hot water supply flow rate sensor 24 are provided in the hot water supply passage 7, and detect the hot water supply temperature and the hot water supply flow rate.

An on-off valve 8a is provided in the hot water pouring passage 8 which is branched from the hot water supply passage 7 and fills the bathtub 13A with hot water, and the downstream end of the hot water pouring passage 8 is connected to the bath going passage portion 13a described later. In order to supply hot water at the temperature set by the operation remote control 60 to the bathtub 13A, hot water from the upper part of the hot water storage tank 5 flows to the mixing valve 16 through the hot water outlet passage 6, and above the water supply bypass passage 18 in the mixing valve 16. It is mixed with water to become hot water at a set temperature, flows into the pouring passage 8, and is supplied to the bathtub 13A through the on-off valve 8a and the bath going passage 13a.

The hot water return passage 32, which connects the downstream end of the reheating hot water passage 31 and the downstream end of the heating hot water passage 29, is connected to the downstream portion of the water supply passage 10.
The upper auxiliary passage 14a for supplying hot water to the auxiliary heat source machine 4 branches from the hot water outlet passage 6 and is connected to the three-way valve 17, and the lower auxiliary passage 33 for supplying low temperature hot water or clean water to the auxiliary heat source machine 4. Is connected to the three-way valve 17 extending from the hot water return passage 32, and the auxiliary introduction passage 14b extending from the three-way valve 17 is connected to the auxiliary heat source machine 4.

A circulation pump 40 is interposed in the auxiliary introduction passage 14b. The auxiliary hot water passage 14c from which the hot water heated by the auxiliary heat source machine 4 is discharged is connected to the hot water passage 6 on the upstream side of the mixing valve 16, and the temperature sensors 41 and 42 and the flow rate adjusting valve 26 are connected to the auxiliary hot water passage 14c. Is intervened. The three-way valve 17 can selectively switch between the hot water storage tank 5 side and the lower auxiliary passage 33 side.

The heating circulation circuit 9 includes an forward passage portion 9a, a return passage portion 9b, and a bypass passage portion 9c connecting them. The upstream end of the outgoing passage portion 9a is connected to the lower end portion of the hot water storage tank 5, and the downstream end thereof is connected to the condensed heat exchanger 36 in the heat pump heat source machine 3. The upstream end of the return passage portion 9b is connected to the condensing heat exchanger 36, and the downstream end thereof is connected to the upper end portion of the hot water storage tank 5.

A circulation pump 25 is interposed in the middle of the outward passage portion 9a, and a circulation temperature sensor 9d is provided in the middle of the return passage portion 9b. A switching three-way valve 15 is interposed at the connection point between the forward passage portion 9a and the bypass passage portion 9c. By switching the switching three-way valve 15, the bypass passage side and the hot water storage tank side can be switched. When the switching three-way valve 15 is switched to the bypass passage side, the hot water heated by the heat pump heat source machine 3 is sent to the heat pump heat source machine 3 so that it can be reheated.

The heat exchanger 12 for bath reheating heats the hot water of the bathtub 13A flowing through the bath reheating circuit 13 by exchanging heat with the hot water flowing through the reheating hot water passage 31 branched from the auxiliary hot water passage 14c. An on-off valve 31a is provided in the reheating hot water passage 31, and is closed so that hot water does not flow into the heat exchanger 12 except during the bath reheating operation.

The bath reheating circuit 13 circulates the hot water of the bathtub 13A and heats it in the heat exchanger 12, and sends the hot water heated from the heat exchanger 12 to the bathtub 13A, and the bathtub 13a and the bathtub 13A. It has a bath return passage portion 13b provided with a reheating pump 30 for sending hot water to the heat exchanger 12.

The heat pump heat source machine 3 is controlled by the control unit 11 via the auxiliary control unit 34, and the heat pump circuit is connected by connecting the compressor 35, the condensing heat exchanger 36, the expansion valve 37, and the evaporation heat exchanger 38 by the refrigerant pipe 39. It is a device that heats hot water by utilizing the heat of the refrigerant and the outside air sealed in the refrigerant pipe 39.

The control unit 11 uses hot water storage temperature sensors 5a to 5d, circulation temperature sensors 9d, water supply temperature sensor 19, hot water supply temperature sensor 23, hot water temperature sensor 43, other temperature sensors 41 and 42, hot water supply flow rate sensor 24, and the like to control the temperature of each part. After acquiring the flow rate, etc., the switching three-way valve 15, the mixing valve 16, the three-way valve 17, the flow rate adjusting valve 26, other valves, the circulation pumps 25, 30, 40, etc. are operated to heat the heat pump heat source machine 3. Control hot water storage operation, hot water supply operation, etc. so that hot water is filled and hot water is supplied at the set temperature of hot water supply.

In order to control the mixing valve 16 described above, the control unit 11 is operated with the temperature of the hot water in the hot water passage 6 detected by the hot water temperature sensor 43 and the clean water temperature of the clean water detected by the water supply temperature sensor 19. A mixing ratio setting table for setting the mixing ratio of hot water and clean water in the mixing valve 16 is stored with the hot water supply set temperature set by the remote control 50 as a parameter, and the mixing ratio set by the mixing ratio setting table is stored. The mixing valve 16 is controlled so as to be.

Here, the hot water storage operation will be briefly described.
The control unit 11 operates the heat pump heat source machine 3, switches the circulation switching three-way valve 15 to the hot water storage tank side, drives the circulation pump 25, and supplies low-temperature hot water to the heat pump heat source machine 3 from the lower part of the hot water storage tank 5. Hot water of the hot water storage set temperature heated by the heat pump heat source machine 3 is stored in the upper part of the hot water storage tank 5. By continuing the hot water storage operation, the layer of hot water at the hot water storage set temperature stored in the upper part of the hot water storage tank 5 expands downward, and the layer of low temperature hot water shrinks.

Next, the mixing valve 16, the orifice 44, and the hot water temperature sensor 43 will be described.
As shown in FIG. 2, the joint connection portion 6b of the pipe member 6a forming the hot water outlet passage 6 is connected to the left end portion of the mixing valve 16, and the water supply pipe pass passage 18 is connected to the lower end portion on the right end side of the mixing valve 16. A hot water supply passage 7 is connected to the upper end of the left side portion of the mixing valve 16. The mixing valve 16 adjusts the position of the valve shaft 46 in the left-right direction by the stepping motor 45, and the gap between the first valve body 47 and the first valve seat 48 in the mixing chamber 53 and the second valve body 49 and the second valve seat 50. It is configured to control the mixing ratio of hot water and clean water by adjusting the gap between them.

The joint connection portion 6b of the pipe member 6a of the hot water discharge passage 6 is fitted into the joint connection portion 51 at the left end of the mixing valve 16 and is horizontally connected, and is fastened by the fastening metal fitting 52.
The passage hole of the joint connecting portion 6b of the pipe member 6a is formed in the orifice 44 having a reduced diameter. The pipe member 6a of the hot water outlet passage 6 extends a small distance to the left from the joint connection portion 6b, then rises vertically upward through the curved portion, and the hot water temperature sensor 43 is attached to the vertical portion of the pipe member 6a. There is. As described above, the orifice 44 is installed below the hot water temperature sensor 43.

Next, the actions and effects of the mixing valve 16, the orifice 44, and the hot water temperature sensor 43 will be described. Auxiliary immediately after hot water supply is stopped in order to alleviate the undershoot of hot water supply temperature when hot water is supplied to the heating heat exchanger 27 by burning the auxiliary heat source machine 4 or when hot water is discharged again after the hot water supply is stopped. When the heat source machine 4 is burned to store hot water, or when the heat pump heat source machine 3 is used to store hot water, the pressure in the hot water outlet 6 increases due to the thermal expansion of the hot water. When the pressure in the hot water outlet passage 6 rises, the mixing ratio in the mixing valve 16 based on the mixing ratio setting table may not be set appropriately.

However, since the orifice 44 is provided in the hot water passage 6 between the hot water temperature sensor 43 that detects the temperature of the hot water in the hot water passage 6 and the mixing valve 16, the hot water is supplied in a state where the pressure of the hot water in the hot water passage 6 is high. Even if the plug is opened, since the flow rate of the high-temperature hot water is throttled by the orifice 44, overshoot of the hot water temperature when the hot water is discharged from the hot water tap is less likely to occur.
Moreover, since the orifice 44 is arranged between the hot water temperature sensor 43 and the mixing valve 16, there is no possibility that the temperature detection accuracy of the hot water temperature sensor 43 will be lowered due to the influence of the turbulent flow generated in the vicinity of the orifice 44.

Since the orifice 44 is arranged below the hot water temperature sensor 43, turbulence and convection in the vicinity of the orifice 44 do not adversely affect the temperature detection by the hot water temperature sensor 43.

Since the orifice 44 is integrally formed with the connection joint portion 6b in which the pipe member 6a of the hot water discharge passage 6 is connected to the mixing valve 16, the number of parts is increased as compared with the case where the orifice 44 is composed of separate parts. It can be reduced and the production cost can be reduced.

It should be noted that the above embodiment is merely an example of a book, and it goes without saying that the connection structure of pipes and valves, the installation position of sensors, etc. can be changed as appropriate. It can be carried out in a form in which various modifications are added to the above embodiment without deviation, and the present invention includes such modifications.

1 Hot water storage device 5 Hot water storage tank 6 Hot water outlet 6a Pipe member 6b Joint connection 10 Water supply passage 16 Mixing valve 18 Bypass passage 20, 21 Check valve 43 Hot water temperature sensor 44 Orifice

Claims (1)

A hot water storage tank, a hot water discharge passage connected to the upper part of the hot water storage tank, a water supply passage connected to the lower part of the hot water storage tank, and high temperature water and low temperature clean water supplied from the hot water storage tank are mixed and set. The hot water mixing means for supplying hot water at the specified temperature, the bypass passage branched from the water supply passage and connected to the hot water mixing means, the temperature detecting means for detecting the hot water temperature of the hot water passage, and the above. In a hot water storage hot water supply device provided with a check valve provided downstream of a branch portion of a water supply passage and in the bypass passage, respectively.
The joint connection portion of the pipe member forming the hot water discharge passage is horizontally connected to the end portion of the hot water mixing means.
The pipe member extends in the horizontal direction and then rises vertically upward, and the temperature detecting means is attached to the vertical portion.
Wherein the temperature sensing means in the tapping passage between the hot and cold water mixing device orifice is provided, the orifice is characterized by being formed by diameter the passage hole of the joint connecting portion of the pipe member hot water storage Hot water supply device.