KR102130789B1 - Hot water distribution system - Google Patents

Abstract

The present invention relates to a hot water distribution system which facilitates the circulation of hot water and automatically detects and heats low temperature hot water to increase thermal efficiency. According to the present invention, the hot water distribution system comprises: a water supply pipe which supplies hot water heated by a boiler; a water supply header which distributes the hot water supplied from the water supply pipe to each heating pipe; a water return header which collects the low temperature hot water flowing into the heating pipe; a water return pipe which returns the low temperature hot water collected by the water return header to the boiler; a heating member for heating the low temperature hot water returned to a return side heating pipe by using the hot water from the water supply header as heating water; a hot water temperature detection sensor for detecting the water temperature of the hot water flowing through the return side heating pipe; a first solenoid valve for regulating the supply of heating water according to the detection of the hot water temperature detection sensor; a heating water detection sensor for detecting the approach of the heating water heated by the heating member; a second solenoid valve for regulating the recovery of the heating water according to the detection of the heating water detection sensor; and a controller which outputs a drive signal to the first solenoid valve when the temperature detected by the hot water temperature detection sensor reaches a preset temperature or less, and outputs a drive signal to the second solenoid valve according to the signal detected by the heating water detection sensor.

Description

Hot water distribution system {HOT WATER DISTRIBUTION SYSTEM}

The present invention relates to a hot water distribution system, and more particularly, to a hot water distribution system capable of improving the thermal efficiency by smoothly circulating hot water and automatically detecting and heating hot water at a low temperature that is returned.

As is well known, the hot water distribution system includes a water supply header for distributing hot water heated in a boiler to each heating pipe, and a water return header for returning hot water used in the heating pipe to the boiler.

As a related art related to the hot water distribution system, Korea Patent Publication No. 10-2018-0026847 (published on March 14, 2018)'Boiler hot water dispenser', Republic of Korea Utility Model No. 0406982 (Registration Date January 17, 2006 1)'Boiler Hot Water Distributor', Korea Registered Utility Model No. 0333458 (Registration Date November 6, 2003)'Hot Water Distributor's Distribution Pipe Fastening Structure', etc. are disclosed.

However, the above-mentioned prior art circulates the process of distributing the hot water heated in the boiler to each heating pipe and returning the low-temperature hot water used in the heating pipe back to the boiler, so that the boiler heats the returned low-temperature hot water again. As it had to be redistributed to the heating pipe afterwards, there was a problem that the cost was increased in the economic aspect due to energy consumption for reheating.

In addition, the above-mentioned conventional technology connects a circulation pump to circulate the hot water used in the heating pipe smoothly, but there is a problem in that it is difficult to promote the smooth circulation of the hot water due to the air contained in the hot water only by operating the circulation pump.

(0001) Republic of Korea Patent Publication No. 10-2018-0026847 (published on March 14, 2018) (0002) Republic of Korea Utility Model No. 0406982 (Registration Date January 17, 2006) (0003) Republic of Korea Utility Model No. 0333458 (Registration Date: November 6, 2003)

The present invention has been devised to solve the conventional problems as described above, and the object of the present invention is to detect and heat hot water at a low temperature that is automatically returned to improve thermal efficiency and to facilitate circulation of hot water. In providing a distribution system.

In order to achieve the above object, the present invention, a water supply pipe for supplying hot water heated in a boiler; A water supply header that distributes the hot water supplied from the water supply pipe to each heating pipe; A return header that collects low-temperature hot water flowing into the heating pipe; A return pipe for returning low temperature hot water collected by the return header to the boiler; In order to heat the low-temperature hot water returned to the heating-side heating pipe with the hot water of the water supply header, a heating chamber having a heating chamber to accommodate the heating-side heating pipe, and heating the hot water of the water supply header with a heating chamber of the heating chamber A heating member including a heated water supply pipe connected to supply water, and a heated water recovery pipe connected to recover heated water heated by heating the return-side heating pipe to a water supply header; A hot water temperature sensor that detects the water temperature of the hot water flowing through the return-side heating pipe; A first solenoid valve installed in the heated water supply pipe to interrupt the supply of heated water according to the detection of the hot water temperature sensor; A heating water detection sensor that moves along the flow path of the heating chamber and detects the approach of the heated water recovered by the heating water recovery pipe; A second solenoid valve installed in the heating water recovery pipe to interrupt the recovery of the heating water according to the detection of the heating water detection sensor; Control unit for outputting a drive signal to the first solenoid valve when the temperature detected by the hot water temperature sensor reaches a predetermined temperature or less, and outputting a drive signal to the second solenoid valve according to the signal detected by the heated water detection sensor Including, but, the water supply pipe is formed with a spiral first vortex groove in which the pitch gradually decreases in the direction of the water supply header to increase the flow rate of hot water, and the water return pipe has a spiral in which the pitch gradually decreases in the direction of the boiler. It is a technical idea to increase the flow rate of the hot water by forming the second vortex groove of.

In the present invention, the other end of the heated water supply pipe connected to one end of the water supply header is connected to a position adjacent to the front edge of the upper left side of the heating chamber, and the other end of the heated water recovery tube connected to one end of the water supply header The end is connected to one side of the rear side of the heating chamber, the heating chamber is provided with a partition plate to partition the heating water supply pipe and the heating water recovery pipe, and heats a flow path for maintaining the heating water supplied from the heating water supply pipe. To form a seal, vertical baffle plates are alternately arranged back and forth, and the baffle plates are alternately arranged back and forth between a plurality of return-side heating pipes.

In the present invention, the upper and lower surfaces of the heating chamber may be formed with slits such that the upper and lower ends of the partition plate and the baffle plate are fitted.

The present invention provides a circulation hole formed on one side of the partition plate, a damper rotatably installed in the circulation hole to open and close the damper, and the damper to guide and purify the heated water collected by the heating water recovery pipe again in the flow path direction. An actuator connected to be driven may further include a heated water temperature sensor that senses the water temperature of the heated water flowing through the heating chamber and outputs it to the control unit.

At this time, the control unit may open the circulation hole by operating the damper so that the heating water is circulated again in the flow path by outputting a drive signal to the actuator when the temperature detected by the heated water temperature sensor reaches a predetermined temperature or higher.

According to the present invention implemented as the above-described solution, the hot water temperature sensor senses the water temperature of the hot water flowing through the heating pipe on the return side and drives the first solenoid valve to automatically heat the hot water in a low temperature state, and returns the heating pipe to the return side. After heating the water, the hot water flowing through the heating water recovery pipe is detected by the heating water detection sensor and the second solenoid valve is driven to automatically recover the heating water to the water supply header. Since it is returned to the boiler, it is possible to reduce the consumption of energy required for reheating the hot water and improve the thermal efficiency, and the hot water supplied from the boiler increases the flow rate through the first vortex groove of the water supply pipe, and collects it with the return header. Since the flow of hot water increases through the second vortex groove of the return pipe and passes through the process of returning it back to the boiler, it has the effect of smoothly maintaining the circulation of the hot water.

1 is a front view showing the overall form according to an embodiment of the present invention.
Figure 2 is an enlarged cross-sectional view showing a longitudinal section by expanding the'A' portion of Figure 1;
Figure 3 is an enlarged cross-sectional view showing an enlarged cross-section of the CC line of Figure 2;
4 is an enlarged cross-sectional view showing an enlarged cross-sectional view along line BB of FIG. 1.
Figure 5 is a cross-sectional view showing a longitudinal section of the water supply pipe according to an embodiment of the present invention.
Figure 6 is a cross-sectional view showing a longitudinal section of the return pipe according to an embodiment of the present invention.
7 is a block diagram according to an embodiment of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be interpreted as being limited to the embodiments described in detail below. This embodiment is provided to more fully describe the present invention to those skilled in the art.

Therefore, the shape of the components expressed in the drawings may be exaggerated to emphasize a more clear description. It should be noted that in each drawing, the same members may be indicated by the same reference numerals. In addition, detailed descriptions of well-known functions and configurations that are judged to unnecessarily obscure the subject matter of the present invention are omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the hot water distribution system of the present invention, a water supply pipe (100) for supplying hot water heated in a boiler, a water supply header (200) for distributing hot water supplied from the water supply pipe (100) to each heating pipe (300), a heating pipe (300) ) To collect the low-temperature hot water flowing into the return header 400, the return pipe 500 for returning the low-temperature hot water collected by the return header 400 to the boiler, and the low-temperature return to the return-side heating pipe 320 A heating member 600 for heating the hot water from the hot water supply header 200 as heating water, a hot water temperature sensor 810 for detecting the water temperature of the hot water flowing through the heating-side heating pipe 320, and a hot water temperature sensor A first solenoid valve 640 that regulates the supply of heated water according to the detection of 810, a heated water detection sensor 820 that detects the approach of heated water heated by the heating member 600, and a heated water detection sensor ( When the temperature detected by the second solenoid valve 650 and the hot water temperature sensor 810, which regulates the recovery of the heated water according to the detection of 820), reaches a predetermined temperature or less, a driving signal is sent to the first solenoid valve 640. And a control unit 900 for outputting and outputting a driving signal to the second solenoid valve 650 according to the signal detected by the heated water detection sensor 820.

The water supply pipe 100 is a helical pipe that spirally supplies hot water heated in a boiler, and the water supply pipe 100 connects the boiler and the water supply header 200.

1 is a front view showing the overall form according to an embodiment of the present invention, Figure 5 is a cross-sectional view showing a longitudinal section of the water supply pipe 100 according to an embodiment of the present invention.

1 and 5, the water supply pipe 100 is formed with a spiral first vortex groove 110 in which the pitch p1 gradually decreases in the direction of the water supply header 200, thereby inducing vortex of hot water, thereby increasing the flow rate. Will increase. Also, the first vortex groove 110 of the water supply pipe 100 is separated into small particles by hitting the air contained in the hot water, so that the air is filled in the water supply header 200, the heating pipe 300, and the return header 400. Can be significantly reduced.

The water supply header 200 is a pipe that distributes the hot water supplied from the water supply pipe 100 to each of the heating pipes 300, and the water supply header 200 includes a plurality of heating pipes 300 and a heating water supply pipe 620. Connected.

Here, the heating pipe 300 includes a water supply-side heating pipe 310 and a return-side heating pipe 320, wherein the water-side heating pipe 310 is a front end portion of the heating pipe 300 connected to the water supply header 200 Means, the return-side heating pipe 320 means an end portion of the heating pipe 300 connected to the return header 400.

Referring to FIG. 1, both ends of the water supply header 200 are supported by a frame 700 disposed on both right and left sides, and the right end is connected to the water supply pipe 100 described above by an elbow (E). A plurality of water supply-side heating pipes 300 are connected at predetermined intervals to the lower portion of the water supply header 200, and a heating water supply pipe 620, which will be described later, is connected to the front side, and a first air vent valve 220 is provided on the upper side. Is provided to exhaust the air in the water supply header (200).

In addition, a first check valve 210 is provided on the water supply-side heating pipe 310 connected to the water supply header 200 to control the flow of hot water.

The return header 400 is a pipe for returning hot water at a low temperature returned from the heating pipe 300, and a plurality of heating pipes 300 are connected to the return header 400.

Referring to Figure 1, both ends of the return header 400 is supported by the frame 700, the left end is connected to the return pipe 500 by an elbow. A plurality of return-side heating pipes 300 are connected at a predetermined interval to the lower portion of the return header 400, and a second air vent valve 420 is provided at an upper side to exhaust air in the feed water header 200.

In addition, a second check valve 410 is provided in the return-side heating pipe 320 connected to the return header 400 to control the flow of hot water.

The return pipe 500 is a pipe for spirally returning hot water of a low temperature returned to the return header 400 to the boiler, and the return pipe 500 connects the return header 400 and the boiler.

6 is a cross-sectional view showing a longitudinal section of the return pipe 500 according to the embodiment of the present invention.

Referring to FIGS. 1 and 6, a second spiral vortex groove 510 in which the pitch p2 gradually decreases in the boiler direction is formed in the return pipe 500 to induce vortex of hot water, thereby increasing the flow rate. . In addition, the spiral groove of the return pipe 500 significantly reduces the phenomenon that air is filled in the water supply header 200, the heating pipe 300, and the return header 400 because the air contained in the hot water is separated into small particles. I can do it.

The heating member 600 is configured to heat low-temperature hot water returned to the return-side heating pipe 320 with hot water from the water supply header 200, and such a heating member 600 accommodates the return-side heating pipe 320. A heating chamber 610 having a heating chamber 611, a heating water supply pipe 620 connected to supply hot water from the water supply header 200 to the heating chamber 611 of the heating chamber 610 as heated water, and a heating pipe on the return side It includes a heated water recovery pipe 630 for recovering the heated water heated to (320) to the water supply header (200).

2 is an enlarged cross-sectional view showing a longitudinal cross-section by enlarging the'A' portion of FIG. 1, FIG. 3 is an enlarged cross-sectional view showing an enlarged cross-section of the CC line of FIG. 2, and FIG. It is an enlarged sectional view shown.

Referring to Figures 2 to 4, the heating chamber 610 is formed in a rectangular parallelepiped shape to be interposed between the two sides of the frame 700, the upper and lower portions of the heating chamber 610 are connected to the boss 614 to communicate vertically. ) Has a through-hole 615 is formed, the heating-side heating pipe 320 is penetrated, and a heating chamber 611 is formed therein to accommodate the heating-side heating pipe 320. In the heating chamber 611, vertical baffle plates 612 are alternately arranged back and forth between the plurality of return-side heating pipes 320 so as to form a flow path for maintaining heating water for a long period of time.

In particular, referring to FIG. 3, the baffle plate 612 is provided with a partition plate 613 and a heating chamber 611 provided in the heating chamber 610 to partition the heating water supply pipe 620 and the heating water recovery pipe 630. Is placed between. Accordingly, the heated water supplied from the heated water supply pipe 620 to the heating chamber 610 passes through the flow path formed by the alternately arranged baffle plates 612 in a zigzag shape, and the partition plate 613 and the heating chamber It passes through the flow path between 611 and is recovered by the heating water recovery pipe 630.

Here, one side of the partition plate 613-a position close to the heated water recovery pipe 630-is formed with a circulation hole 613a to guide the heated water recovered by the heated water recovery pipe 630 again in the flow path direction, To circulate, a damper 830 is rotatably installed in the circulation hole 613a to control the circulation of the heated water and regulate the circulation amount. The actuator 840 is connected and operated to the damper 830, and the actuator 840 is driven or stopped according to the water temperature of the heated water sensed by the heated water temperature sensor 850.

4, the actuator 840 is preferably implemented as a hydraulic or pneumatic cylinder connected to rotate the damper 830, but may be implemented as a motor connected to rotate the damper 830 as needed. .

The heated water temperature sensor 850 is installed in the heating chamber 611 to detect the water temperature of the heated water flowing through the heating chamber 611, and the water temperature detected by the heated water temperature sensor 850 is transmitted to the control unit 900 Is output. For example, when the water temperature of the heated water sensed by the heated water temperature sensor 850 exceeds a preset temperature, the corresponding signal is output to the control unit 900, and the control unit 900 is driven by the actuator 840 according to the input signal. By outputting a signal, the circulation hole 613a is opened by the operation of the damper 830. At this time, the heated water temperature sensor 850 may divide the section over a predetermined temperature and adjust the opening angle of the damper 830 to adjust the circulation amount of the heated water.

In addition, a baffle slit 616 is formed on the upper and lower surfaces of the heating chamber 611 so that the upper and lower ends of the baffle plate 612 are fitted. In addition, a partition slit 617 is formed on the upper and lower surfaces of the heating chamber 611 so that the upper and lower ends of the partition plate 613 are fitted.

One end of the heated water supply pipe 100 is connected to one front side of the water supply header 200 and the other end is connected to a position adjacent to the front left corner of the upper surface of the heating chamber 610. The heating water supply pipe 100 is supplied to the heating chamber 611 of the heating chamber 610 so as to use hot water from the water supply header 200 as heating water.

In addition, a first solenoid valve 640 is installed at one end of the heated water supply pipe 100 to electrically interrupt the flow of heated water, which is detected by the hot water temperature sensor 810. The supply of heated water is regulated according to the water temperature of the heated water.

One end of the heating water recovery pipe 630 is connected to one side of the rear of the water supply header 200 and the other end is connected to one side of the rear of the heating chamber 610. The heating water recovery pipe 630 recovers the heating water that has heated the return-side heating pipe 320 to the water supply header 200.

In addition, a second solenoid valve 650 is installed at one end and the other end of the heated water recovery pipe 630 to electrically interrupt the flow of the recovered heating water, and the second solenoid valve 650 detects the heated water According to the approach of the heated water detected by the sensor 820, the recovery of the heated water is controlled.

The hot water temperature sensor 810 is a sensor that detects the water temperature of hot water flowing through the heating pipe 320 of the water return side, and the hot water temperature sensor 810 is installed in the heating pipe 320 of the water return side and detects the water temperature of the detected hot water. Is output to the control unit 900.

The heated water detection sensor 820 is a sensor that moves along the flow path of the heating chamber 611 and detects the approach of heated water recovered by the heated water recovery pipe 630, and this heated water detection sensor 820 is heated water It is installed in the heating chamber 611 so as to be close to the other end of the recovery pipe 630, and outputs the detected approach state of the heated water to the control unit 900.

The control unit 900 mainly controls driving of the first solenoid valve 640, the second solenoid valve 650, and the actuator 840 according to signals input from each sensor 810, 820, 850 It has a function.

Referring to FIG. 7, the control unit 900 outputs a driving signal to the first solenoid valve 640 when the temperature sensed by the hot water temperature sensor 810 reaches a preset temperature or less, and the hot water in the water supply header 200 is output. One end of the heated water supply pipe 620 is opened to supply it to the heating chamber 611.

In addition, when the detection signal of the heating water is input from the heating water detection sensor 820, the control unit 900 outputs a driving signal to the second solenoid valve 650 to supply the heating water heating the heating-side heating pipe 320 to the water supply header ( 200) to open one end and the other end of the heated water recovery pipe 630.

In addition, the control unit 900 outputs a driving signal to the actuator 840 when the temperature sensed by the heated water temperature sensor 850 exceeds a preset temperature, and the actuator 840 is such that the heated water circulates again in the flow path direction. By operating the damper 840, the circulation hole 830 is opened.

Hereinafter, the overall operation of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the hot water heated in the boiler is guided to the vortex through the spiral water supply pipe 100 and is supplied to the water supply header 200 in an increased flow rate.

Subsequently, the hot water supplied to the water supply header 200 is distributed to each of the heating pipes 300 and passed through the heating pipe 300 to be returned to the water return header 400. The hot water returned to the water return header 400 is Heat is exchanged to achieve low temperature.

At this time, when the temperature detected by the hot water temperature sensor 810 reaches a predetermined temperature or less, the control unit 900 outputs a driving signal to the first solenoid valve 640 to heat the hot water in the water supply header 200 to the heating chamber ( 611) so that one end of the heated water supply pipe 620 is opened, hot water from the water supply header 200 is supplied to the heating chamber 611 through the heated water supply pipe 620.

Subsequently, the heating water supplied to the heating chamber 611 heats the return-side heating pipe 320 while passing the flow path as shown in FIG. 3 to form low-temperature hot water flowing through the heating pipe 300 at a high temperature. do.

Subsequently, when the detection signal of the heating water is input from the heating water detection sensor 820, the control unit 900 outputs a driving signal to the second solenoid valve 650 to supply the heated water heated by the heating-side heating pipe 320. Since one end and the other end of the heated water recovery pipe 630 are opened to be recovered by the header 200, the heated water in the heating chamber 611 is recovered by the water supply header 200.

At this time, when the temperature sensed by the heated water temperature sensor 850 exceeds a preset temperature, the control unit 900 outputs a driving signal to the actuator 840, and the actuator 840 cycles the heated water again in the flow path direction. The damper 840 is operated as much as possible to open the circulation hole 830.

On the other hand, the hot water collected in the return header 400 is guided to the vortex through the spiral return pipe 500 and is returned to the boiler in an increased flow rate.

Therefore, in the hot water distribution system of the present invention, the hot water supplied from the boiler increases the flow rate through the first vortex groove 110 of the water supply pipe 100, and the hot water collected by the return header 400 of the hot water return pipe 500 Since the flow rate is increased through the second vortex groove 510 and is returned to the boiler, the circulation of hot water can be maintained smoothly.

In addition, the hot water distribution system of the present invention detects the water temperature of the hot water flowing through the return side heating pipe 320 by the hot water temperature sensor 810 to drive the first solenoid valve 640 to automatically heat the hot water in a low temperature state. Then, after heating the return-side heating pipe 320, the heating water detection sensor 820 detects the approach of the heating water flowing to the heating water recovery pipe 630 to drive the second solenoid valve 650 to supply the heated water. As it is automatically recovered by the header 200, the heated hot water is returned to the boiler through the return header 400 and the return pipe 500, thereby reducing the consumption of energy required for reheating the hot water and improving the thermal efficiency. .

The embodiments of the present invention described above are merely exemplary, and those skilled in the art to which the present invention pertains will appreciate that various modifications and other equivalent embodiments are possible.

Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description.

Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims. It is also to be understood that the invention includes all modifications and equivalents and alternatives within the spirit and scope of the invention as defined by the appended claims.

100: water supply pipe 110: first vortex groove
200: water supply header 300: heating piping
310: water supply side heating pipe 320: return side heating pipe
400: return header 500: return pipe
510: second vortex groove 600: heating member
610: heating chamber 611: heating chamber
612: baffle plate 613: partition plate
614: boss 615: through hole
616: baffle slit 617: compartment slit
620: heated water supply pipe 630: heated water recovery pipe
640: first solenoid valve 650: second solenoid valve
700: Frame 810: Hot water temperature sensor
820: heating water detection sensor 830: damper
840: actuator 850: heated water temperature sensor
900: control unit p1, p2: pitch

Claims (4)

A water supply pipe supplying hot water heated in a boiler;
A water supply header that distributes the hot water supplied from the water supply pipe to each heating pipe;
A return header for collecting hot water at a low temperature flowing into the heating pipe;
A return pipe for returning low temperature hot water collected by the return header to the boiler;
In order to heat the low-temperature hot water returned to the heating-side heating pipe with the hot water of the water supply header, a heating chamber having a heating chamber to accommodate the heating-side heating pipe, and heating the hot water of the water supply header with a heating chamber of the heating chamber A heating member including a heated water supply pipe connected to supply water, and a heated water recovery pipe connected to recover heated water heated by heating the return-side heating pipe to a water supply header;
A hot water temperature sensor for detecting the water temperature of the hot water flowing through the heating pipe on the return side;
A first solenoid valve installed in the heated water supply pipe to interrupt the supply of heated water according to the detection of the hot water temperature sensor;
A heating water detection sensor that moves along a flow path of the heating chamber and detects the approach of the heated water recovered by the heating water recovery pipe;
A second solenoid valve installed in the heating water recovery pipe to interrupt the recovery of the heating water according to the detection of the heating water detection sensor;
Control unit for outputting a drive signal to the first solenoid valve when the temperature detected by the hot water temperature sensor reaches a predetermined temperature or less, and outputting a drive signal to the second solenoid valve according to the signal detected by the heated water detection sensor Contains;
The water supply pipe is formed with a spiral first vortex groove whose pitch gradually decreases in the direction of the water supply header to increase the flow rate of hot water, and the water return pipe has a spiral second vortex groove whose pitch gradually decreases in the direction of the boiler. Is formed to increase the flow rate of hot water,
The other end of the heating water supply pipe connected to one end of the heating water supply pipe is connected to a position adjacent to the front left corner of the upper surface of the heating chamber, and the other end of the heating water recovery pipe connected to one end to the water supply header is the heating It is connected to one side of the rear of the chamber,
The heating chamber is provided with a partition plate to partition the heating water supply pipe and the heating water recovery pipe, and alternates vertical baffle plates back and forth to form a flow path for maintaining the heating water supplied from the heating water supply pipe in the heating chamber. Place it,
The baffle plate is a hot water distribution system, characterized in that arranged alternately back and forth between a plurality of return-side heating pipes. delete The method according to claim 1,
A hot water distribution system characterized in that slits are formed on the upper and lower surfaces of the heating chamber so that the upper and lower portions of the partition plate and the baffle plate are fitted. The method according to claim 3,
A circulation hole formed on one side of the partition plate so as to guide and purify the heated water collected by the heated water recovery pipe again in the flow path direction,
A damper rotatably installed in the circulation hole to open and close,
An actuator connected to drive the damper,
Further comprising a heating water temperature sensor for detecting the water temperature of the heating water flowing through the heating chamber and outputting it to the control unit,
The control unit outputs a drive signal to the actuator when the temperature sensed by the heated water temperature sensor reaches a predetermined temperature or higher, and operates a damper so that the heated water circulates again in the flow path, thereby opening the circulation hole. system.

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