JP2018031520A - Hot water storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage water heater capable of preventing overshooting of a hot water delivery temperature caused by an increase in pressure in a hot water delivery passage.SOLUTION: A storage water heater (1) includes: a hot water storage tank (5); a hot water delivery passage (6) connected to an upper portion of the hot water storage tank (5); a water supply passage (10) connected to a lower portion of the hot water storage tank (5); hot water and water mixing means (16) for mixing a high-temperature water supplied from the hot water delivery passage (6) with a low-temperature clean water so as to supply hot water having a set temperature; a bypass passage (18) branched from the water supply passage (10) and connected to the hot water and water mixing means (16); temperature detection means (43) for detecting a hot water temperature in the hot water delivery passage (6); and check valves (20, 21) provided on the downstream side of the branch portion of the water supply passage (10) and in the bypass passage (18), respectively. An orifice (44) is provided in the hot water delivery passage (6) between the temperature detection means (43) and the hot water and water mixing means (16).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water storage hot water supply apparatus, and more particularly to a hot water storage hot water supply apparatus capable of preventing an overshoot of a hot water temperature caused by a pressure increase in a hot water discharge passage.

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

  This heat pump type hot water storage hot water supply device includes a heat pump type heat source device that heats hot water with a refrigerant, a hot water storage tank that stores heated hot water, a hot water circulation pipe that circulates hot water between the heat pump type heat source device and the hot water storage tank, and high-temperature heating. It is equipped with a gas combustion type auxiliary heat source device that performs hot hot water supply and backs up the output of the heat source when using a terminal or bathing bath, and circulates hot water in the hot water storage tank to the hot water circulation piping to condense the heat pump heat source device In the heat exchanger, heat is exchanged between the refrigerant and hot water to heat the hot water, and hot water and clean water from the hot water storage tank are heated by an auxiliary heat source as needed and supplied to the hot water passage.

  A hot water supply passage is connected to the upper part of the hot water storage tank, a water supply passage is connected to the lower part of the hot water storage tank, and hot water having a temperature set by mixing hot water supplied from the hot water supply passage with cold hot water is supplied. A hot water / water mixing valve for carrying out and a bypass passage branched from the water supply passage and connected to the hot water / water mixing valve are provided.

  A mixing valve inlet thermistor for detecting the temperature of hot water at the inlet of the mixing valve and a water inlet thermistor for detecting the temperature of fresh water in the water supply passage are provided, and the hot water temperature, the hot water temperature, and the hot water supply set temperature from the operation remote controller. A mixing ratio setting table for setting the mixing ratio in the mixing valve using the above as a parameter is stored in the control unit. Normally, the mixing ratio of hot water and tap water in the mixing valve includes the hot water temperature, the hot water temperature, and the hot water supply set temperature. And set based on the mixing ratio setting table.

In Patent Document 1, in a heat pump type hot water storage hot water supply apparatus, a high temperature hot water storage tank, a high temperature hot water discharge passage that discharges hot water from the high temperature hot water storage tank, a low temperature hot water storage tank, and a low temperature hot water supply passage that discharges hot water from the low temperature hot water storage tank. A confluence of the high temperature hot water passage and the low temperature hot water passage is configured by supplying a hot water to the mixing valve from a confluence where the high temperature hot water passage and the low temperature hot water passage are directly joined together. The mixing valve provided in can be omitted.

JP 2008-309351 A

When the auxiliary heat source is burned and hot water is supplied to the high-temperature heating circuit, or when the hot water is discharged again after the hot water supply is stopped, the auxiliary heat source device is turned on immediately after the hot water supply is stopped to alleviate the undershoot of the hot water temperature. When hot water is stored by burning or when hot water is stored using a heat pump heat source machine, the pressure in the hot water passage rises due to thermal expansion of the hot water.
As described above, when the tip end (caran) is opened in a state where the pressure in the hot water passage is increased, the hot water hot water in the hot water passage is immediately pushed to cause an overshoot of the hot water temperature. There is.

  In other words, the mixing ratio setting table for setting the mixing ratio in the mixing valve is created on the assumption that the pressure of hot water and clean water is the same. Since it is not possible to set a proper mixing ratio, it is not possible to discharge hot water at the hot water supply set temperature, and overshoot occurs in the above-described hot water temperature.

The technique of Patent Document 1 aims at omitting the mixing valve at the junction of the low temperature hot water passage and the high temperature hot water passage, and does not focus on the above-mentioned problem.
An object of the present invention is to provide a hot water storage and hot water supply device that can prevent overshooting of the hot water temperature due to an increase in pressure in the hot water passage.

  The hot water storage and hot water supply apparatus according to claim 1 includes a hot water storage tank, a hot water passage connected to an upper portion of the hot water storage tank, a water supply passage connected to a lower portion of the hot water storage tank, and hot water supplied from the hot water passage. Hot water mixing means for supplying hot water at a set temperature by mixing low temperature tap water, a bypass passage branched from the water supply passage and connected to the hot water mixing means, and hot water temperature of the hot water passage In a hot water storage and hot water supply apparatus comprising a temperature detection means for detecting, and a check valve provided in each of the branch passage downstream of the water supply passage and the bypass passage, between the temperature detection means and the hot water mixing means The hot water passage is provided with an orifice.

  According to a second aspect of the present invention, there is provided the hot water storage and hot water supply apparatus according to the first aspect, wherein the orifice is disposed below the temperature detecting means.

  The hot water storage and hot water supply apparatus according to claim 3 is characterized in that the orifice is integrally formed with a connecting joint portion where a pipe member of the hot water passage is connected to the hot water mixing means.

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 high temperature hot water pressure in the hot water passage is high. Even if the mixing ratio is not properly set based on the mixing ratio setting table, the flow rate of hot water is reduced by the orifice, so the temperature of the hot water when the hot water is discharged from the tip is exceeded. Shooting is less likely to occur.
In addition, since the orifice is arranged between the temperature detection means and the hot water / water mixing means, there is no possibility that the temperature detection accuracy of the temperature detection means is lowered due to the influence of the turbulent flow generated near the orifice.

  According to the invention of claim 2, since the orifice is disposed below the temperature detecting means, adverse effects on temperature detection by the temperature detecting means due to turbulent flow and convection in the vicinity of the orifice are further reduced.

  According to a third aspect of the present invention, the orifice is formed integrally with the connecting joint portion where the pipe member of the hot water passage is connected to the hot water mixing means, so that the orifice is formed as a separate part. Thus, the number of parts can be reduced and the production cost can be reduced.

It is a block diagram of the hot water storage hot-water supply apparatus concerning the Example of this invention. It is sectional drawing of a mixing valve and the pipe member connected to it.

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

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

The hot water storage hot water supply unit 2 is connected to the auxiliary heat source unit 4, the hot water storage tank 5 for storing hot water, the hot water passage 6 connected to the upper end of the hot water storage tank 5, and the hot water passage 6 to supply hot water to the hot water supply destination. The hot water supply passage 7, the pouring passage 8 that branches from the hot water supply passage 7 and fills the bathtub 13 </ b> A, and the hot water in the hot water storage tank 5 are heated by the heat pump heat source device 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 bath recuperation for heating the hot water in the bathtub 13A, , and add焚湯water passage 31 for supplying hot water to the heat exchanger 12 is branched from the auxiliary tapping passage 14c, and additionally焚回path 13, a heat exchanger 27 for heating, the branched heat exchanger from the auxiliary hot water passage 14c Heating hot water passage 29 for supplying hot water to 27; A heating medium passage 28a for high temperature heating, a heating medium passage 28b for low temperature heating, a heating medium return passage 28c, a hot water return passage 32, a control unit 11 for performing various controls, an operation remote controller 60, and the like are provided. .

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

  The water supply passage 10 supplies low-temperature clean water from a clean water source to the hot water storage tank 5 and the like, and has an upstream end connected to the clean water source and a downstream end connected to the lower end of the hot water storage tank 5. A 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 downstream of the branch portion, and a check valve 21 is provided in the water supply bypass passage 18. A high temperature hot water 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 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 junction between the auxiliary hot water passage 14 c for discharging hot hot water from the auxiliary combustor 4 and the hot water passage 6, a 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 a hot water supply set temperature to the bathtub 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 passage 6 is adjusted. Hot water adjusted to the set temperature is supplied from the hot water supply passage 7 to the hot water tap, or supplied from the pouring passage 8 to the bathtub 13A. 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 to detect the hot water supply temperature and the hot water supply flow rate.

  An on-off valve 8a is provided in the pouring passage 8 branched from the hot water passage 7 and filling the bathtub 13A, and the downstream end of the pouring passage 8 is connected to a bath passage portion 13a described later. In order to supply hot water of a temperature set by the operation remote controller 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 discharge passage 6, and in the mixing valve 16 from the water supply bypass passage 18 It is mixed with water and flows into the pouring passage 8 as hot water at a set temperature, and is supplied to the bathtub 13A through the on-off valve 8a and the bath passage portion 13a.

A hot water return passage 32 to which the downstream end of the remedy hot water passage 31 and the downstream end of the heating hot water passage 29 are connected is connected to the downstream portion of the water supply passage 10.
An upper auxiliary passage 14a for supplying hot water to the auxiliary heat source device 4 is branched from the hot water supply passage 6 and connected to the three-way valve 17, and a lower auxiliary passage 33 for supplying low-temperature hot water or clean water to the auxiliary heat source device 4. Is extended from the hot water return passage 32 and connected to the three-way valve 17, and the auxiliary introduction passage 14 b extending from the three-way valve 17 is connected to the auxiliary heat source unit 4.

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

  The heating circulation circuit 9 includes a forward passage portion 9a, a return passage portion 9b, and a bypass passage portion 9c that connects them. The upstream passage 9 a has an upstream end connected to the lower end of the hot water storage tank 5 and a downstream end connected to the condensation heat exchanger 36 in the heat pump heat source unit 3. The return passage portion 9 b has an upstream end connected to the condensation heat exchanger 36 and a downstream end connected to the upper end of the hot water storage tank 5.

  A circulation pump 25 is interposed in the middle of the forward 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 a 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 unit 3 is sent to the heat pump heat source unit 3 so as to be reheated.

  The heat exchanger 12 for bath remedy heats hot water in the bathtub 13A flowing through the bath remedy circuit 13 by heat exchange with hot water flowing through the remedy hot water passage 31 branched from the auxiliary hot water passage 14c. An open / close valve 31a is provided in the remedy hot water passage 31 and is closed so that hot water does not flow into the heat exchanger 12 except during bath remedy operation.

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

  The heat pump heat source unit 3 is controlled by the control unit 11 via the auxiliary control unit 34, and the compressor 35, the condensation heat exchanger 36, the expansion valve 37, and the evaporating heat exchanger 38 are connected by a refrigerant pipe 39 to connect the heat pump circuit. The apparatus is configured to heat hot water using the refrigerant enclosed in the refrigerant pipe 39 and the heat of the outside air.

  The control unit 11 includes hot water storage temperature sensors 5a to 5d, a circulating temperature sensor 9d, a feed water temperature sensor 19, a hot water supply temperature sensor 23, a hot water temperature sensor 43, other temperature sensors 41 and 42, a hot water flow rate sensor 24, and the like. The flow rate is acquired, 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, and the heat pump heat source unit 3 is heated. Hot water storage operation, hot water supply operation, etc. are controlled so that hot water is filled or hot water is supplied at a hot water supply set temperature.

  For the control of the mixing valve 16, the control unit 11 includes the temperature of the hot water in the hot water passage 6 detected by the hot water temperature sensor 43, the temperature of the drinking water detected by the feed water temperature sensor 19, and the operation A mixing ratio setting table in which the mixing ratio of hot water and tap water in the mixing valve 16 is set using the hot water supply setting temperature set by the remote controller 50 as a parameter is stored, and the mixing ratio set by this mixing ratio setting table is stored. Thus, the mixing valve 16 is controlled.

Here, the hot water storage operation will be briefly described.
The control unit 11 operates the heat pump heat source unit 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 from the lower part of the hot water storage tank 5 to the heat pump heat source unit 3. Hot water at a set temperature of hot water heated by the heat pump heat source unit 3 is stored in the upper part of the hot water storage tank 5. By continuing the hot water storage operation, the hot water layer of the hot water set temperature stored in the upper part of the hot water storage tank 5 expands downward, and the low temperature hot water layer 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 connecting portion 6 b of the pipe member 6 a that forms the hot water passage 6 is connected to the left end portion of the mixing valve 16, and the water supply bypass 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, the gap between the first valve body 47 and the first valve seat 48 in the mixing chamber 53, the second valve body 49 and the second valve seat 50. By adjusting the gap between them, the mixing ratio of hot water and clean water is controlled.

The joint connecting part 6 b of the pipe member 6 a of the hot water passage 6 is connected to the joint connecting part 51 at the left end of the mixing valve 16 in a horizontal state and is fastened by a fastening fitting 52.
A 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 passage 6 extends from the joint connecting portion 6b to the left by a small distance and then rises vertically through the curved portion, and the hot water temperature sensor 43 is attached to the vertical portion of the pipe member 6a. Yes. Thus, the orifice 44 is installed below the hot water temperature sensor 43.

  Next, functions and effects of the mixing valve 16, the orifice 44, and the tapping temperature sensor 43 will be described. When the auxiliary heat source unit 4 is burned to supply high-temperature hot water to the heating heat exchanger 27, or in order to relieve the undershoot of the hot water temperature when the hot water is turned off again, In the case of storing hot hot water by burning the heat source unit 4 or in the case of storing hot water by the heat pump heat source unit 3, the pressure in the hot water discharge passage 6 increases due to the thermal expansion of the hot water. In a state where the pressure in the tap water passage 6 is increased, there is a possibility that the mixing ratio in the mixing valve 16 based on the mixing ratio setting table is not properly set.

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, hot water supply is performed in a state where the pressure of the hot hot water in the hot water passage 6 is high. Even if the stopper is opened, the flow rate of the hot water is reduced by the orifice 44, so that it is difficult for the hot water temperature to overshoot when the hot water is discharged from the hot water stopper.
In addition, since the orifice 44 is disposed 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 is lowered due to the influence of turbulent flow generated near the orifice 44.

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

  The orifice 44 is formed integrally with the connecting joint portion 6b where the pipe member 6a of the hot water passage 6 is connected to the mixing valve 16, so that the number of parts can be reduced as compared with the case where the orifice 44 is constituted by separate parts. The production cost can be reduced.

  In addition, the said Example is only an example of this book, Of course, the connection structure of piping, valves, the installation position of sensors, etc. can be changed suitably, and those skilled in the art will understand the meaning of this invention. Without departing from the present invention, various modifications can be made to the above-described embodiment, and the present invention includes such modifications.

DESCRIPTION OF SYMBOLS 1 Hot water storage hot water supply apparatus 5 Hot water storage tank 6 Hot water supply passage 6a Pipe member 6b Joint connection part 10 Water supply passage 16 Mixing valve 18 Bypass passages 20 and 21 Check valve 43 Hot water temperature sensor 44 Orifice

Claims (3)

A hot water storage tank, a hot water 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 hot water supplied from the hot water passage and low temperature hot water are mixed and set. Hot water mixing means for supplying hot water at a given temperature, a bypass passage branched from the water supply passage and connected to the hot water mixing means, a temperature detection means for detecting hot water temperature in the hot water passage, and In a hot water storage and hot water supply apparatus provided with a check valve provided in each of the branch passage downstream of the water supply passage and the bypass passage,
An hot water storage hot water supply apparatus, wherein an orifice is provided in the hot water passage between the temperature detection means and the hot water mixing means.   The hot water storage and hot water supply apparatus according to claim 1, wherein the orifice is disposed below the temperature detection means.   3. The hot water storage and hot water supply apparatus according to claim 1, wherein the orifice is formed integrally with a connecting joint portion where a pipe member of the hot water passage is connected to the hot water mixing means.