JP3036230U - Water heater - Google Patents

Abstract

(57) Abstract: It is an object to be solved to provide a hot water supply device capable of directly supplying and heating clean water to a heat exchanger provided in a heat source machine. A heat source device (11) for generating heated water, a secondary water channel (12) in which the heated water is circulated, a primary water channel (13) in which heated water is circulated, and these primary water channel and secondary water channel. A heat exchanger 14 for indirectly contacting and exchanging heat between the heated water and the heated water is provided, and a check valve 15 for preventing backflow of the heated water is provided in the primary water passage. ,
The secondary water channel is provided with pressure releasing means G for releasing the pressure in the secondary water channel to atmospheric pressure when the pressure in the primary water channel falls below a predetermined value. To do.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a hot water supply device such as a boiler for centralized hot water supply of a building, and particularly to a secondary water channel in which heated water is circulated and this secondary water channel is indirectly contacted via a heat exchanger. The present invention relates to a hot water supply device provided with a primary water channel into which heated water is sent.

[0002]

[Prior art]

 Conventionally, in a central hot water supply facility in a building or the like, as shown in FIG. 3, the heat exchanger 3 is provided for a one-can-one-channel type heat source device 1 and a secondary water channel 2 formed by the heat source device 1. A hot water supply device 5 is used which is provided side by side with a primary water channel 4 through which heated water flows. The upstream end of the primary waterway 4 is connected to a water storage tower 6 installed on the roof of a building, and the downstream end is connected to hot water equipment installed in each room. There is.

The conventional hot water supply device 5 configured as described above circulates the water in the secondary water passage that passes through the heat source device 1 and ignites the heater of the heat source device 1 so that The water is heated to generate heated water at a predetermined temperature, and the water in the water storage tower 6 is supplied to the primary water channel 4 as heated water according to the usage status of the hot water using equipment in each room. While the water to be heated is passed through the heat exchanger 3, the water to be heated is heated to a predetermined temperature by heat exchange with the water to be supplied to the equipment using hot water.

[0004]

[Problems to be solved by the device]

 By the way, in such a conventional hot water supply apparatus 5, the heated water to be supplied to each room is once fed from the water supply pipe to the water storage tower 6 installed on the roof, and then by the weight thereof. It is sent to the heat exchanger 3 and heated.

This is because the water supply pipe and the primary water passage 4 are separated in the water storage tower 6 so that the heated water in the secondary water passage 2 may be damaged by the heat exchanger 3 or the like. Note that even when it flows into the primary water channel 4, this heated water is prevented from flowing into the water supply pipe through the primary water channel 4, thereby preventing pollution of the water. This is an unavoidable measure from the perspective of preventing water pollution. However, in such a conventional hot water supply device 5, when constructing the central hot water supply facility, it is necessary to provide a water storage tower 6 and incidental equipment such as a pump for sending clean water to the water storage tower 6. However, not only is the equipment cost high, but maintenance work for these devices is required, resulting in higher running costs.

The present invention has been made in view of the above conventional problems, and provides a hot water supply device capable of directly supplying clean water to a heat exchanger provided in a heat source machine to heat the heat exchanger. This is a problem to be solved.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the hot water supply device according to claim 1 of the present invention is provided with a heat source device for generating heated water, a secondary water channel through which the heated water is circulated, and heated water. And a heat exchanger for indirectly exchanging heat between the heated water and the water to be heated, and the primary water channel, and the primary water channel, A check valve for preventing backflow of heated water is provided, and when the pressure in the primary water channel is lower than a predetermined value, the pressure in the secondary water channel is set to the atmospheric pressure in the secondary water channel. It is characterized in that a pressure release means for releasing the pressure is provided.

A hot water supply apparatus according to a second aspect of the present invention is a heat source device that generates heated water, a secondary water channel through which the heated water is circulated, and a primary water channel through which heated water is sent. A primary water channel and a secondary water channel are indirectly contacted with each other, and a heat exchanger for exchanging heat between the heated water and the heated water is provided, and the heated water is prevented from flowing backward in the primary water channel. And a shutoff valve for closing the primary water channel when the pressure in the primary water channel falls below a predetermined value.

The hot water supply device according to claim 3 of the present invention is the device according to claim 1 or 2, wherein the temperature of the heated water sent from the heat exchanger is detected in the primary water channel. A temperature sensor for outputting a drive signal for controlling the heating capacity of the heat source device based on the temperature of the heated water is provided.

Further, the hot water supply device according to claim 4 of the present invention is the hot water supply device according to any one of claims 1 to 3, wherein the primary water channel is activated when the internal pressure thereof becomes a predetermined value or more. The feature is that a relief valve is provided.

[0011]

[Embodiment of the invention]

 Hereinafter, an embodiment of the present invention will be described with reference to FIG. A hot water supply apparatus according to the present embodiment shown by reference numeral 10 in FIG. 1 is a heat source device 11 for generating heated water, a secondary water channel 12 into which the heated water is sent, and a primary water channel in which heated water is circulated. 13 and a heat exchanger 14 for indirectly contacting the primary water channel 13 and the secondary water channel 12 to exchange heat between the heated water and the water to be heated. Is provided with a check valve 15 for preventing backflow of heated water and a pressure sensor 16 for detecting the pressure in the primary water channel 13 so that the pressure in the primary water channel 13 is higher than a predetermined value. When the temperature falls below the pressure, a pressure releasing means G for releasing the pressure in the secondary water passage 12 to the atmospheric pressure based on the detection signal from the pressure sensor 16 is provided.

[0012] Next, to explain these details, the heat source unit 11 includes a burner 17 for burning a gaseous fuel or a liquid fuel such as gas or petroleum, and a combustion chamber 18 in which a combustion flame of the burner 17 is formed. A heat exchange water pipe 20 which is arranged so as to cross a combustion gas passage 19 communicated with the combustion chamber 18 and constitutes a part of the secondary water passage 12, the combustion chamber 18 and the combustion gas. A heating water tank 21 which is provided so as to surround the passage 19 and forms a part of the secondary water passage 12 is provided around the passage 19, and the heating water tank 21 stores the heating water in the heat exchanger. A heating water supply pipe 22 for supplying the heating water to the heating water tank 14 and a heating water return pipe 23 for returning the heating water passed through the heat exchanger 14 to the heating water tank 21 are connected to each other. The secondary water passage 12 is formed by 21, the heat exchange water pipe 20, the heated water supply pipe 22, the heated water return pipe 23, and a part of the heat exchanger 14. A circulating pump 24 for circulating the heated water is provided in the heated water supply pipe 22, and the heated water is circulated at a pressure of about 0.7 kg / cm ² during operation. It is like this.

The heat exchanger 14 has a part of the primary water channel 13 and the secondary water channel 12 formed therein, and a plurality of plates partitioning and forming these water channels 12 and 13 are laminated. It is a plate type heat exchanger configured and has completed heat exchange from the heat exchanger 14 and the water supply pipe 25 that supplies clean water as heated water to the portion of the primary water channel 13 formed inside. Hot water supply pipes 26 for sending the heated water to the respective hot water-using devices are connected to the water supply pipes 25, and the water supply pipe 25 is supplied with tap water having a water pressure of about 1.5 kg / cm ² or more. ing.

The check valve 15 is attached to the water supply pipe 25 near the heat exchanger 14, and the check valve 15 is installed in the water supply pipe 25 located between the check valve 15 and the heat exchanger 14. The pressure sensor 16 is provided.

The check valve 15 is closed when the pressure on the downstream side of the check valve 15 becomes higher than the pressure on the upstream side. As a situation in which the pressure on the upstream side of the check valve 15 decreases, it is conceivable that the water pipe or the like leading to the water supply pipe 25 is damaged and leaks occur.

On the other hand, in the present embodiment, the primary water passage 13 is provided near the outlet from the heat exchanger 14, that is, near the connection portion of the hot water supply pipe 26 with the heat exchanger 14, Provided is a relief valve 27 that discharges the heated water flowing in the primary water passage 13 to the outside when the pressure in the water passage 13 reaches a predetermined pressure and suppresses the pressure increase in the primary water passage 13. The operating pressure is set to 5 kg / cm ² , and the operating stop pressure after operation is set to 4.25 kg / cm ² .

These set pressures are set in consideration of the strength of the heat exchanger 14 or the strength of various equipments forming the primary water passage 13.

Further, a siphon pipe 28 connected to the inside of the heating water tank 21 is connected to a side portion of the heating water tank 21, and the siphon pipe 28 has three water levels. A total of 29 (29a to 29c) are mounted, and the water level in the siphon pipe 28 is detected by these water level gauges 29 to detect the water level in the heating water tank 21 at three positions (upper, middle, and lower). It is supposed to do.

Further, a makeup water pipe 30 connected to a water pipe is connected to an upper portion of the heating water tank 21, and a discharge port of the makeup water pipe 30 is heated water stored in the heating water tank 21. The make-up water pipe 30 is provided with a solenoid valve 31 which is operated based on a detection signal from the water level gauge 29, and is provided on the upstream side of the solenoid valve 31. A strainer 32 is provided, and an overflow hole 34 is formed on the side wall of the upper end portion of the heating water tank 21 at a position having a sufficient distance so that the heating water does not come into contact with the discharge port of the makeup water pipe 30. Further, a temperature sensor 35 for measuring the temperature of the heated water is attached at a position below the lowest water level of the heated water.

The check valve 15, the pressure sensor 16, the burner 17, the circulation pump 24, the water level gauges 29 (29a to 29c), the solenoid valve 31, and the temperature sensor 35 are located on the heating water tank 21 side. It is electrically connected to a control unit 36 attached to the section, and in this control unit 36, a control signal for controlling each operating device is output based on a detection signal from each sensor. ing .

Further, in the present embodiment, when the pressure in the primary water channel 13 drops below a predetermined pressure, based on the detection signal from the pressure sensor 16, from the control unit 36 to the circulation pump. The stop signal is output to 24 to stop the pressurization of the heated water, so that the pressure of the heated water becomes atmospheric pressure, and the pressure sensor 16, circulation pump 24, and The control unit 36 constitutes the atmosphere releasing means G in this embodiment.

Next, the operation of the hot water supply apparatus 10 according to the present embodiment configured as described above will be described. When the main power source is turned on in the control unit 35, the burner 17 is ignited and the circulation is performed. The pump 24 is operated so that the heated water is circulated between the heat source device 11 and the heat exchanger 14.

Then, the heated water is heated when passing through the heat exchange water pipe 20 in the heat source device 11, and the heated water is heated to a predetermined temperature, for example, about 60 ° C. to 90 ° C. The temperature is maintained by controlling the combustion state of the burner 17.

In this state, when the hot water equipment installed in each room is put into use, the heated water in the primary water channel 13 is supplied from the water pipe to the hot water equipment via the heat exchanger 14. However, while the water to be heated passes through the heat exchanger 14, the water to be heated is heated to a predetermined temperature by heat exchange with the water to be heated to the predetermined temperature, and then, to the equipment using hot water described above. Supplied.

If, for some reason, a defect such as a pinhole occurs in the heat exchanger 14, which is a part where the heated water and the heated water coexist, the water is normally supplied from the water supply pipe 25. Since the heated water to be heated is maintained at about 1.5 kg / cm ² or more, and the pressure of the heated water is maintained at 0.7 kg / cm ² by the circulation pump 24, the heated water is It flows into the heated water through the pinhole.

When the heated water continues to flow into the heated water, the water level in the heated water tank 21 rises, and the overflow hole 34 formed in the upper portion of the heated water tank 21. Is discharged to the outside of the device.

Therefore, even if the heat exchanger 14 is damaged, the heated water in the secondary water channel 12 does not mix into the primary water channel 13 and the contamination of clean water is prevented. .

Further, when water leakage or the like occurs in a portion of the water supply pipe 25 on the upstream side of the check valve 15, the pressure of the heated water in the heat exchanger 14 is 0. ． The pressure of water to be heated in the primary waterway 13 abnormally drops when the water supply pipe or water supply pipe is not damaged due to water pressure lower than 7 kg / cm ² , water supply restriction, water cutoff, etc. As a result, the pressure of the heated water may be lower than the pressure of the heated water.

In this case, since the pressure of the water to be heated in the primary water passage 13 is lowered as a whole, there is no pressure difference between the upstream side and the downstream side of the check valve 15, and therefore, The check valve 15 may not be operated.

However, when the pressure of the water to be heated in the primary water passage 13 becomes, for example, 1 kg / cm ² or less, this pressure information is output to the control unit 36, and the control unit 36 outputs the pressure information. A stop signal is output to the circulation pump 24 and the pressure in the secondary water passage 12 is released to the atmospheric pressure, so that the heated water is prevented from flowing into the primary water passage 13.

As a result, even when a pressure drop in the primary water passage 13 occurs due to a malfunction in a portion other than the hot water supply device 10 such as water supply restriction or water cutoff, the action of the atmospheric release means G causes The secondary water channel 12 is set to the atmospheric pressure, and as a result, even if the heat exchanger 14 has a pinhole or the like, the heated water in the secondary water channel 12 does not flow into the water supply.

In this case, the internal pressure in the primary water channel 13 for stopping the circulation pump 24 is 1.0 kg which is slightly higher than the heating water pressure of the secondary water channel 12 of 0.7 kg / cm ^2. / Cm ² prevents heated water from flowing from the secondary water channel 12 to the primary water channel 13 in the heat exchanger 14.

Therefore, with respect to the pressure drop in the primary water channel 13 due to water supply restriction or water interruption, the double fail-safe function of the check valve 25 and the atmosphere opening means G causes the heated water in the secondary water channel 12 to be supplied to the tap water. Is prevented from being mixed in.

As described above, according to the hot water supply device 10 according to the present embodiment, in the heat exchanger 14 in which the primary water channel 13 and the secondary water channel 12 coexist, there is a defect such that the both water channels 12 and 13 are communicated with each other. When it occurs, the heated water in the secondary water channel 12 is reliably prevented from flowing back through the water supply pipe 25 of the primary water channel 13.

As a result, even when the water supply is directly connected to the heat exchanger 14, the contamination of the water supply is surely prevented, and the water supply can be directly connected to the heat exchanger 14. Therefore, the water storage tower 6 that was provided to cut off the communication between the water supply and the hot water supply device 10 and the pump for supplying the water supply to the water storage tower 6 are not required, which reduces the manufacturing cost of the device. In addition to the reduction, the periodic inspection is simplified and the running cost is reduced.

On the other hand, in the present embodiment, when the pressure in the primary water channel 13 becomes equal to or higher than the set value, the relief valve 27 is operated and the heated water in the primary water channel 13 is discharged to the outside. By discharging the heat to the primary water passage 13, the pressure in the primary water passage 13 is prevented from rising, and damage to the heat exchanger 14 and other devices is prevented.

It should be noted that the shapes, dimensions, and the like of the respective constituent members shown in the above embodiment are examples, and can be variously changed based on design requirements and the like.

For example, as shown in FIG. 2, a temperature sensor 37 is provided in the middle of the hot water supply pipe 26, the hot water supply temperature is monitored by the temperature sensor 37, and the hot water supply temperature is changed according to the change in the hot water supply temperature. By adjusting the combustion state of the burner 17, the hot water supply temperature can be controlled with high accuracy.

Further, as shown in FIG. 2, an opening / closing valve 38 is provided on the upstream side of the check valve 15 provided in the primary water passage 13, and a pressure sensor 16 is provided on the upstream side thereof. The opening / closing valve 38 may be operated when the pressure in the primary water channel 13 becomes equal to or lower than a predetermined pressure to block the primary water channel 13.

With such a configuration, the flow of the unheated water in the primary water passage 13 can be stopped by mechanical means, and its backflow can be reliably prevented.

[0041]

[Effect of the invention]

 As described above, according to the hot water supply device of the first aspect of the present invention, the check valve is provided at the inflow portion of the primary water channel for supplying the clean water to the heat exchanger, and the primary water is supplied. Since the pressure in the secondary water channel is controlled by the pressure releasing means based on the internal pressure of the primary water channel detected by the pressure sensor provided in the channel, the upstream side of the primary water channel is caused by some cause. When the pressure in the primary water channel decreases, the check valve shuts off the primary water channel on the upstream side of the heat exchanger. Even if the pressure difference necessary to operate the stop valve cannot be obtained, the pressure in the primary water channel is set to atmospheric pressure based on the detection signal from the pressure sensor, so that the secondary The internal pressure of the canal is equal to or less than the internal pressure of the primary canal. As a result, even if the heat exchanger is damaged so that the primary water channel and the secondary water channel communicate with each other, the heated water in the secondary water channel flows to the upstream side of the primary water channel. It can be surely prevented from flowing.

Therefore, in a state where the water supply is directly connected to the heat exchanger and used, even if the above-mentioned damage of the heat exchanger occurs, it is possible to reliably prevent the heated water in the secondary water channel from flowing into the water supply. can do.

As a result, auxiliary equipment such as a water tower and a water supply pump, which have been conventionally required, can be dispensed with, and the equipment cost can be reduced, and maintenance and inspection work can be simplified to reduce the running cost. be able to.

According to the hot water supply apparatus according to the second aspect of the present invention, when the pressure in the primary water channel becomes equal to or lower than the predetermined pressure, the opening / closing valve provided in the primary water channel is operated to operate the primary water channel. Since the water channel is shielded, the flow of unheated water in the primary water channel can be stopped by a mechanical means to reliably prevent the backflow thereof.

Further, according to the hot water supply apparatus of the third aspect of the present invention, the temperature of the heated water sent from the heat exchanger is detected in the primary water channel, and based on the temperature of the heated water, Since the temperature sensor that outputs the drive signal for controlling the heating capacity of the heat source device is provided, the temperature of the hot water supplied actually can be controlled with high accuracy.

Further, according to the hot water supply apparatus according to the fourth aspect of the present invention, the primary water channel is provided with the relief valve that is activated when the internal pressure becomes equal to or higher than the predetermined value. It is possible to prevent abnormal pressure rise in the equipment and prevent damage to various equipment installed in the primary waterway system and equipment such as heat exchangers.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a hot water supply device according to an embodiment of the present invention.

FIG. 2 is a system configuration diagram showing a hot water supply device according to another embodiment of the present invention.

FIG. 3 is a system configuration diagram showing a conventional hot water supply device.

[Explanation of symbols]

 10 Hot Water Supply Device 11 Heat Source Machine 12 Secondary Water Channel 13 Primary Water Channel 14 Heat Exchanger 15 Check Valve 16 Pressure Sensor 27 Relief Valve 36 Control Unit 37 Temperature Sensor G Pressure Release Means

Claims (4)

[Utility model registration claims] 1. A heat source device for generating heated water, a secondary water channel in which the heated water is circulated, a primary water channel into which heated water is sent, and these primary water channel and secondary water channel indirectly. A heat exchanger for bringing the heated water and the heated water into heat exchange with each other, and a check valve for preventing backflow of the heated water is provided in the primary water passage; The hot water supply device is provided with a pressure releasing means for releasing the pressure in the secondary water passage to the atmospheric pressure when the pressure in the primary water passage falls below a predetermined value. 2. A heat source device for generating heated water, a secondary water channel in which the heated water is circulated, a primary water channel into which heated water is fed, and these primary water channel and secondary water channel indirectly. A heat exchanger for bringing the heated water and the heated water into heat exchange with each other, and a check valve for preventing backflow of the heated water in the primary water passage; An on-off valve which is provided to close the primary water channel when the pressure falls below a predetermined value. 3. A drive for detecting the temperature of the water to be heated sent from the heat exchanger in the primary water channel and controlling the heating capacity of the heat source device based on the temperature of the water to be heated. The water heater according to claim 1 or 2, further comprising a temperature sensor that outputs a signal. 4. The relief valve according to claim 1, wherein the primary water passage is provided with a relief valve that is actuated when the internal pressure exceeds a predetermined value. Hot water supply device described.