JPH05172353A - Instantaneous hot-water apparatus - Google Patents

Abstract

PURPOSE:To securely feed hot water of proper temperature by connecting an inlet pipe and an outlet pipe to the upper part of a hot-water storage tank, extending the end opening of the inlet pipe to the vicinity of the bottom of the tank, connecting a branch pipe to the inlet pipe, and positioning the end opening of the branch pipe in the vicinity of the base end opening of the outlet pipe. CONSTITUTION:A water heater 1, a hot-water feed plug 2 and a hot-water feed pipe 3 are connected and an instantaneous hot-water apparatus A is provided in series near the plug 2. In a hot-water storage tank 10 of the apparatus A, a heater 11 is provided at the bottom thereof and an inlet pipe 12 connected to the pipe 3 on the upstream side thereof and an outlet pipe 13 connected the pipe 3 on the downstream side thereof are provided in the upper section of the tank 10. The end opening 12b of the pipe 12 is extended to the vicinity of the bottom of the tank and a branch pipe 14 is connected to the middle point of the pipe 12 so that the end opening 14a of the pipe 14 is positioned near the base end opening 13a of the pipe 13. At the start of feeding hot water, half of residual low temperature water (w) in the pipe 3 flows into the tank 10, while the other half of the water flows to the pipe 13 via the pipe 14. At this moment, hot water W in the tank 10 is sucked up by the ejector effect so that hot water of proper temperature is sent to the plug 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instant hot water supply device for preventing water in a pipe from a hot water supply heat source to a hot water supply port to come out as cold water when tapping hot water.

[0002]

2. Description of the Related Art Conventionally, as one form of hot water supply device such as a central hot water supply system, a hot water supply heat source and a hot water supply port of a terminal are connected by a hot water supply pipe, and an immediate hot water supply device is connected in series in the vicinity of the hot water supply port of the hot water supply pipe. There is one provided.

As shown in FIG. 6, the above-mentioned instant hot water supply device is provided with a heating element c at the bottom of the hot water storage tank b, and an inflow connecting to the upstream side of the hot water supply pipe g at the ceiling wall of the hot water storage tank b. The pipe d and the outflow pipe e which is connected to the downstream side of the hot water supply pipe g are connected to each other, and the tip opening of the inflow pipe d is extended to the vicinity of the bottom of the hot water storage tank b and flows out to the upper part of the inflow pipe d. The small hole f for use is opened.

In this way, the hot water supply pipe g to the inflow pipe d
The residual water w of low temperature in the hot water supply pipe g flowing into the hot water storage tank b through the opening is opened at the tip opening of the inflow pipe d located near the bottom of the hot water storage tank b and at the upper part of the inflow pipe d. The high-temperature hot water boiled by the heating element c and pushed out by the residual water w flowing out from the tip opening of the inflow pipe d is pushed upward by the high-temperature hot water and the small hole f for the outflow f. After mixing with the residual water w flowing out more, it is sent from the outflow pipe e to the hot water supply port through the hot water supply pipe g.

Further, a hot water temperature detection sensor s is attached to the bottom of the hot water storage tank b, the hot water storage temperature is detected by the sensor s, and the detection result is input to a control unit (not shown). Thus, the heating temperature of the heating element c is controlled so that high temperature hot water having a constant temperature can be sent to the hot water supply port through the hot water supply pipe g.

[0006]

However, in the case of the above-mentioned instant hot water supply device, the outflow small hole f opened at the upper part of the inflow pipe d.
Although the residual water w is made to flow out more, the residual water w is mixed with the hot water W in the hot water storage tank b before flowing into the outflow pipe e, and the hot water boiled by the heating element c flows out as it is. Since the hot water is discharged from the hot water supply port through the hot water supply pipe g from the pipe e, hot water having a temperature higher than the appropriate temperature suddenly comes out at the moment when the hot water supply port is opened, and there is a problem that the user is burned.

Further, the hot water temperature detecting sensor s is a hot water storage tank b.
Since the temperature of the hot water detected by the sensor s fluctuates greatly due to the effect of convection because it is provided at the bottom of the sensor s, the sensor s cannot detect the hot water temperature in a stable manner, and the heating element The control of the heating temperature by c is not stable, and the temperature of the high-temperature hot water sent to the hot water supply pipe is higher than the temperature detected by the sensor s, which causes the user to get burned.

The curve a in FIG. 5 represents the temperature change of the hot water discharged from the hot water supply port of the hot water supply apparatus equipped with such an instant hot water supply apparatus, but the temperature immediately after the hot water supply is instantaneously higher than the optimum temperature T. Recognize.

[0009]

Therefore, in the present invention, in an instant hot water supply device provided near a hot water supply port of a hot water supply pipe connecting a hot water supply heat source and a hot water supply port of a terminal, a hot water storage tank having a heating body at the bottom thereof is provided. Connect an inflow pipe connected to the upstream side of the hot water supply pipe and an outflow pipe connected to the downstream side of the hot water supply pipe to the upper part, and extend the tip opening of the inflow pipe to near the bottom of the hot water storage tank, and inflow the same. An immediate hot water supply device is provided, characterized in that the base end of the branch pipe is connected to the middle part of the pipe and the tip end opening of the branch pipe is located in the vicinity of the base end opening of the outflow pipe. Is.

Further, in the present invention, the flow rate control means is provided at a position downstream of the branch pipe connection position in the inflow pipe,
The tip of the inflow pipe is formed to have a gradually expanding diameter, and the inflow pipe connected to the upstream side of the hot water supply pipe is connected to the lower part of the hot water storage tank with a heating element at the bottom, while the hot water supply is provided above the hot water storage tank. The outflow pipe connected to the downstream side of the pipe was connected, the base end of the branch pipe was connected to the tip end of the inflow pipe, and the tip opening of the branch pipe was positioned near the base end opening of the outflow pipe. Another feature is that an outflow hot water temperature detection sensor that detects the temperature of the outflow hot water is attached to the outflow pipe, and the heating temperature of the heating element can be controlled via the control unit based on the detection result of the sensor.

[0011]

[Function] When the hot water supply port of the terminal is opened, the residual water in the hot water supply pipe which is first used flows into the hot water storage tank through the distribution pipe while the temperature of the hot water is kept low, and the residual water that has flowed in is mixed with the hot water in the hot water storage tank. At the same time, due to the inflow of residual water, the hot water in the hot water storage tank is discharged from the hot water supply port through the outflow pipe and the hot water supply pipe.At this time, approximately half of the residual water flowing into the hot water storage tank through the inflow pipe is The hot water that has flowed out near the bottom of the hot water storage tank from the tip opening of the inflow pipe is pushed up, while approximately half of it passes through the branch pipe from the middle of the inflow pipe, In the hot water storage tank, due to the ejector effect of the residual water flowing from the tip opening of the outlet pipe to the vicinity of the base end opening of the outflow pipe and flowing from the tip opening of the branch pipe to the base end opening of the outflow pipe. Smooth outflow of hot water It causes to flow, in order to be mixed with residual water, proper from the hot water inlet temperature (e.g., 50 ° C.) can be immediately hot water of, moreover, is constantly tapping.

Further, by providing a flow rate control means such as an orifice at a position downstream of the branch pipe connection position in the inflow pipe, the flow amount outflowed from the tip opening of the inflow pipe and the outflow through the branch pipe in the middle. By controlling the flow rate, the temperature of the mixed hot water flowing into the outflow pipe can be controlled to an appropriate temperature.

Further, by forming the tip end portion of the inflow pipe in a gradually expanding shape, the residual water flowing out into the hot water storage tank from the tip end opening portion of the inflow pipe is smoothly discharged to the surroundings, and the outflow residual water The hot water in the hot water storage tank can be pushed up smoothly by the above, and as described above, it can be reliably mixed with the residual water flowing out from the opening of the end of the branch pipe, and then flowed out through the outflow pipe at an appropriate temperature. it can.

Further, an outflow hot water temperature detection sensor is attached to the outflow pipe of the above-mentioned immediate hot water supply device, and the high temperature hot water flowing out through the outflow pipe is directly detected by the sensor, thereby heating based on the detection result of the sensor. Since the control of the heating temperature of the body can be performed accurately by the control unit, the hot water can be discharged at an appropriate temperature also from this point.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A shows an instant hot water supply apparatus according to the present invention, in which a water heater 1 as a hot water heat source and a hot water tap 2 forming a hot water supply port of a terminal are connected by a hot water supply pipe 3 to supply hot water. The above-mentioned instant hot water supply device A is provided in a portion of the pipe 3 near the hot water tap 2.
Are provided in series. Reference numeral 4 is a water supply pipe, 5 is an outflow hot water temperature detection sensor, 6 is a control unit, and 11 is a heater.

In this way, the hot water of the water heater 1 is once supplied to the instant hot water supply device A through the hot water supply pipe 3, and the immediate hot water supply device A → the hot water supply pipe 3 → the hot water tap 2 discharges the hot water supply pipe. Even when the residual water in 3 is cooled (or cooled in some cases), the residual water is mixed with the hot water in the instant hot water supply device A to make hot water of an appropriate temperature and the hot water tap 2 is immediately discharged. I am able to do so. When the residual water is discharged from the hot water supply device A, the high-temperature water in the hot water supply device A is also removed, and thereafter, the appropriate temperature water from the water heater 1 is discharged.

In the configuration as described above, FIG.
The instant hot water supply apparatus A is shown as an Example.

As shown in FIG. 2, the instant hot water supply apparatus A is provided with a heater 11 as a heating body in the lower part of the hot water storage tank 10 so that the hot water stored in the hot water storage tank 10 can have a desired temperature (eg, 85 ° C.). ) Can be kept warm and the ceiling wall 10 of the hot water storage tank 10
The inflow pipe 12 and the outflow pipe 13 are installed side by side in a, and the base end 12 of the inflow pipe 12 is
a is connected to the upstream side of the hot water supply pipe 3, and the tip opening
While extending 12b near the bottom of the hot water storage tank 10, the base end opening 13a of the outflow pipe 13 is opened flush with the inner surface of the ceiling wall 10a of the hot water storage tank 10, and the tip 13b is located downstream of the hot water supply pipe 3. Connected to the side, the base end of the branch pipe 14 is connected to the middle portion of the inflow pipe 12, and the tip opening portion of the branch pipe 14 is connected.
14a is located directly below the base end opening 13a of the outflow pipe 13. 7 is a heat insulation layer part.

Moreover, an orifice 15 as a flow rate control means is formed in the inflow pipe 12 at a position downstream of the branch pipe connection position.

In this way, the residual water w whose temperature has been lowered in the hot water supply pipe 3 can be caused to flow into the hot water storage tank 10 through the inflow pipe 12, and at this time, the residual water w
About half of the flow is straight down through the inflow pipe 12 and the tip opening 12
While it flows out into the hot water storage tank 10 from b and pushes up the hot water W in the hot water storage tank 10 upward, approximately half of the hot water is stored in the branch pipe 14
Through the tip end opening 14a of the branch pipe 14 toward the base end opening 13a of the outflow pipe 13 into the hot water storage tank 10, and also flows into the outflow pipe 13 through the base end opening 13a to cause an ejector effect. Thus, the hot water W in the surroundings is sucked, and the hot water mixed with the residual water w and the hot water W at an appropriate temperature can be discharged from the outflow pipe 13 → the hot water supply pipe 3 → the hot water tap 2.

Moreover, an orifice 15 is formed in the inflow pipe 12, and the flow rate of the residual water w flowing directly into the outflow pipe 13 through the branch pipe 14 is controlled to control the mixing ratio of the residual water w and the hot water W. Since the temperature can be controlled, the appropriate temperature (the appropriate temperature for supplying water to the hot water tap of the hot and cold water mixing tap is:
Hot water (for example, 50 ° C.) can be discharged from the hot water tap 2.

Further, as shown in FIGS. 1 and 2, an outflow hot water temperature detecting sensor 5 is attached to the outflow pipe 13, and the same sensor 5 is installed.
Is connected to the input side of the control unit 6, while a heater 11 is connected to the output side of the control unit 6, and the outflow hot water temperature detection sensor 5 detects the temperature of the mixed hot water flowing out through the outflow pipe 13. The detection result is input to the control unit 6, and the control unit 6 compares the detected temperature with a preset appropriate temperature and controls the heating temperature of the hot water W by the heater 11 so that the comparison value becomes zero. I am trying to do it.

In this way, the temperature of the mixed hot water flowing out through the outflow pipe 13 can be directly detected by the outflow hot water temperature detecting sensor 5, and the heating temperature by the heater 11 can be controlled accurately by the control section 6. Moreover, from this point as well, it is possible to ensure hot water discharge at an appropriate temperature.

In FIG. 5, Q1 is a graph showing the test results of the temperature of hot water discharged from the hot water tap 3 through the above-mentioned immediate hot water supply device A, and at the time t1 (about 5 seconds) immediately after tapping, the proper temperature T
(For example, 50 ° C.), the temperature was about 0.7 ° C. higher, but after that, at time t2 (about 20 seconds), the temperature reached the proper temperature T, and the substantially proper temperature T was maintained.

Further, in the present embodiment, the orifice 15 is provided as the flow rate control means, but the inflow pipe 12 and / or the branch pipe 14 are provided.
If it is possible to provide an appropriate pressure loss,
The present invention is not limited to this, and for example, the diameter of the pipe may be changed or a constant flow valve may be provided.

FIG. 3 shows an instant hot water supply apparatus A as a second embodiment. The instant hot water supply apparatus A gradually expands the tip end portion of the inflow pipe 12 of the instant hot water supply apparatus A of the first embodiment. A bell mouth portion 12c is formed as a diameter.

In this way, the residual water flowing straight down in the inflow pipe 12 is smoothly discharged along the bell mouth portion 12c to the bottom of the hot water storage tank 10 and diffused, and the hot water boiled by the heater 11 is heated. Hot water stored in the bottom of the tank 10
Is moved up in a wide range and gently to smooth the mixing with the residual water w flowing out from the front end opening 14a of the branch pipe 14 and to smoothly flow into the base end opening 13a of the outflow pipe 13. I am allowed to do it.

In FIG. 5, Q2 is a graph showing the test results of the hot water discharged from the hot water tap 2 through the above-mentioned instant hot water supply apparatus A, in which hot water of approximately the proper temperature T was discharged.

FIG. 4 shows an instant hot water supply apparatus A as a third embodiment, and the instant hot water supply apparatus A includes the inflow pipe 12
Is piped into the heat insulating layer portion 7 of the hot water storage tank 10 so that the tip opening 12b is projected and opened from the bottom wall 10b of the hot water storage tank 10 to the inside to form the orifice 15 at the tip of the inflow pipe 12. The base end of the branch pipe 14 is connected to the upstream side of the orifice 15 so that the front end opening 14a of the branch pipe 14 is positioned immediately below the base end opening 13a of the outflow pipe 13.

As described above, the tip end opening 12b of the inflow pipe 12 is arranged at the bottom of the hot water storage tank 10, and the hot water storage tank is located from the same position.
Since the residual water w can be caused to flow upward into the inside of the inside 10, the hot water W heated by the heater 11 can be surely pushed up and raised, and the branch pipe 14 The mixed water can be smoothly mixed into the outflow pipe 13 by rapidly mixing with the residual water w flowing out from the tip opening 14a. In addition, the tip opening 12b side and the branch pipe
The distribution ratio to 14 can be appropriately controlled by the orifice 15.

Also in the case of such an instant hot water supply apparatus A, the same good result as the graph Q2 which is the test result of the instant hot water supply apparatus A as the second embodiment was obtained.

[0033]

According to the present invention, the following effects can be obtained.

Since the tip end opening of the branch pipe whose base end is connected to the middle of the inflow pipe is located near the base end opening of the outflow pipe, the inside of the hot water supply pipe flowing in through the inflow pipe is located. Approximately half of the residual water can be reliably mixed with the hot water in the hot water storage tank and can be caused to flow out from the outflow pipe at an appropriate temperature, and the appropriate temperature hot water can be immediately and reliably discharged from the hot water supply port.

Since high-temperature hot water is stored in the hot-water storage tank of the instant hot-water supply device, the capacity can be reduced to approximately one half as compared with the method of storing suitable hot water.

Since only the inflow pipe and the branch pipe are connected, the processing cost and the material cost can be reduced.

Since the branch pipe is provided in the hot water storage tank, the space can be made smaller and more compact than the bypass pipe provided outside the hot water storage tank.

Since the flow rate control means is provided at a position on the downstream side of the branch pipe connection position in the inflow pipe, the branch flow amount can be accurately flowed.

Since the outflow hot water temperature detection sensor is attached to the outflow pipe, the outflow hot water temperature can be accurately detected by the sensor, and the hot water temperature is optimized by controlling the heating temperature by the heating element. Can be secured.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a hot water supply system including an instant hot water supply device according to the present invention.

FIG. 2 is an explanatory cross-sectional view of the instant hot water supply device as the first embodiment.

FIG. 3 is an explanatory cross-sectional view of an instant hot water supply device as a second embodiment.

FIG. 4 is a sectional explanatory view of an instant hot water supply device as a third embodiment.

FIG. 5 is a graph showing test results of tapping temperature at tapping.

FIG. 6 is a cross-sectional explanatory view of a conventional instant hot water supply device.

[Explanation of symbols]

 A Immediate hot water supply system 1 Water heater 2 Hot water tap 3 Hot water supply pipe 10 Hot water storage tank 11 Heater 12 Inflow pipe 13 Outflow pipe 14 Branch pipe 15 Orifice

Claims (5)

[Claims] 1. A hot water supply device provided near a hot water supply port of a hot water supply pipe that connects a hot water supply heat source to a hot water supply port of a terminal, and is connected to an upstream side of the hot water supply pipe at an upper portion of a hot water storage tank having a heating body at a bottom portion. Connect the inflow pipe and the outflow pipe connected to the downstream side of the hot water supply pipe respectively, extend the tip opening of the inflow pipe to near the bottom of the hot water storage tank, and place the base end of the branch pipe in the middle of the inflow pipe. An immediate hot water supply device, characterized in that, while being connected, the front end opening of the branch pipe is located in the vicinity of the base end opening of the outflow pipe. 2. The immediate hot water supply apparatus according to claim 1, wherein a flow rate control means is provided at a position downstream of the branch pipe connection position in the inflow pipe. 3. The instant hot water supply apparatus according to claim 1, wherein the tip end portion of the inflow pipe is formed to have a gradually expanded diameter. 4. An immediate hot water supply device, which is provided in series in the middle of a hot water supply pipe connecting a hot water supply heat source and a hot water supply port of a terminal, and is connected to an upstream side of the hot water supply pipe at a lower portion of a hot water storage tank having a heating body at the bottom. While connecting the inflow pipe that connects to the hot water storage tank, connect the outflow pipe connected to the downstream side of the hot water supply pipe to the upper part of the hot water storage tank,
An immediate hot water supply device characterized in that a base end of a branch pipe is connected to a tip end portion of an inflow pipe, and a tip end opening portion of the branch pipe is located in the vicinity of a base end opening portion of the outflow pipe. 5. An outflow water temperature detection sensor for detecting the temperature of the outflow water is attached to the outflow pipe, and the heating temperature of the heating element can be controlled via a control unit based on the detection result of the sensor. The instant hot water supply device according to any one of claims 1 to 4.