JP5299911B2 - Heat source water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat source water supply system capable of stabilizing a hot water supply amount and a supply temperature, reducing a fuel cost and an operation management cost, suppressing unreasonable generation of carbon dioxide, and suppressing breeding of bacteria. <P>SOLUTION: This heat source water supply system includes a primary hot water supply main pipe 10 from a hot water generator 1 to a hot water storage tank 2, a secondary hot water supply main pipe 11 from the hot water storage tank to a load 3, a circulative return pipe 12 returned from the load 3, and an auxiliary water pipe 13 from a makeup water source 4 to the hot water generator 1 or the hot water storage tank 2. A three-way valve 5 is mounted on the primary hot water supply main pipe 10, a first branch section 7a of a branch section 7 of a composite return pipe 14 is connected to the hot water generator 1, a second branch section 7b of the branch section 7 is connected to the three-way valve 5, the primary hot water supply main pipe 10 is connected to the three-way valve, an injection pipe 15 to the hot water storage tank 2 is connected to the three-way valve, and further a control panel 23 performing detection by a temperature sensor 21 in the hot water storage tank 2, and transmitting control signals to a module 22 of the three-way valve and the hot water generator 1, is disposed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention provides a supply system for supplying heat source water (hot water) serving as a heat source in a hot water hot water tank installed in a hotel, hospital, factory, hot bath facility, elderly care facility, etc. that uses a large amount of hot water. More specifically, in a hot water hot water tank that receives and stores high temperature (about 60 to 95 ° C.) hot water from the hot water supply side, the hot water in the hot water hot water tank is located in the upper layer and the middle layer. Separated into a medium temperature part and a low temperature part located in the lower layer, the hot water temperature in the lower layer close to the hot water storage tank outlet is prevented from further lowering, and the hot water supply and supply temperature are stabilized. In addition, the present invention relates to a heat source water supply system that can reduce fuel costs and reduce operation management costs, suppress excessive generation of carbon dioxide, and suppress germ growth in terms of hygiene management.

Conventionally, as a device for forcibly stirring hot water in a hot water hot water tank, high pressure steam (7 to 15 kg / cm ² ) previously developed by the present inventor is used as a heat source, and heat source water that can be used in an open tank. A supply system (Patent Document 1) has been proposed.

Japanese Utility Model Publication No. 3-57317

The heat source water supply system shown in the above-mentioned Patent Document 1 includes a hot water supply main pipe from a hot water generator constituted by a steam boiler and a heat exchanger, and a return hot water from a load side as piping for feeding hot water into a hot water hot water tank. The circulation return pipe to be fed is individually connected directly to the hot water hot water storage tank, and the make up water pipe to which make up water is fed is also directly connected to the hot water hot water tank separately from the above various pipes.
For this reason, a large temperature difference is caused in the hot water temperature of each part in the hot water hot water tank, and the hot water generator is excessively operated unnecessarily, or conversely, the hot water with the necessary hot water condition and temperature condition cannot be supplied. The problem that occurred.
In addition, in order to obtain thermal calories under the same conditions, it is forced to operate uneconomically under conventional hot water supply systems. There was a situation such as causing the problem of increase.

  The present invention provides a three-way valve, connects a hot water supply side pipe from a hot water generator to one of the supply side pipes connected to the three-way valve, and a circulation return pipe to the other one supply side pipe connected to the three-way valve. Connect the composite pipe connecting the make-up water pipe, connect the discharge pipe connected to the three-way valve to the hot water storage tank, and supply these hot water under the control of the control panel. It is intended to provide a heat source water supply system with improved problems.

The heat source water supply system according to claim 1 of the present invention stores the hot water generated by the hot water generator 1 in the hot water hot water tank 2 and supplies the hot water from the hot water hot water tank 2 to the load 3 for the purpose. In the heat source water supply system,
A primary hot water supply main pipe 10 from the hot water generator 1 to the hot water hot water tank 2 is provided, a secondary hot water supply main pipe 11 from the hot water hot water tank to the load 3 is provided, and the hot water generator 1 or the hot water hot water tank from the load 3 is provided. 2 is provided with a circulation return pipe 12 that returns to 2 and a makeup water pipe 13 that leads from the makeup water source 4 to the warm water generator 1 or the warm water hot water storage tank 2,
A three-way valve 5 is attached to the primary hot water supply main pipe 10,
The circulation return pipe 12 and make-up water pipe 13 are joined at the joining section 6 to form a composite return pipe 14, a branch section 7 is provided at the tip of the composite return pipe 14, and the first branch pipe 7 a of the branch section 7 is provided. Is connected to the hot water generator 1, the second branch pipe 7 b of the branch section 7 is connected to be the supply side pipe of the three-way valve 5, and the primary hot water supply is made to be the other supply side pipe of the three-way valve The main pipe 10 is connected, and an injection pipe 15 for injecting hot water into the hot water hot water tank 2 is connected so as to be a discharge side pipe of the three-way valve,
The heat source water supply system includes a three-way valve module 22 and a control panel 23 that transmits a control signal to the hot water generator 1 by detecting with a temperature sensor 21 in the hot water storage tank 2.

  The heat source water supply system according to claim 2 of the present invention is the heat source water supply system according to claim 1, wherein a forced agitator 24 is provided in the hot water hot water tank 2.

  In the heat source water supply system according to claim 3 of the present invention, the mounting position of the secondary hot water supply main pipe 11 in the hot water hot water tank 2 is approximately three minutes from the lowermost end in the height dimension of the hot water hot water tank 2. The mounting position of the injection pipe 15 in the hot water storage tank 2 is located slightly higher than the mounting position of the secondary hot water supply main pipe 11. 2. The heat source water supply system according to 2.

  The heat source water supply system according to the present invention is provided with a three-way valve, one of the supply side pipes connected to the three-way valve is a hot water supply side pipe from the hot water generator, and the other one supply side pipe connected to the three-way valve is It is a composite pipe connecting the circulation return pipe and the makeup water pipe, and the discharge side pipe connected to the three-way valve is connected to the hot water hot water tank to prevent the hot water temperature in the hot water hot water tank from further lowering and fuel costs. As well as reducing emissions, the operation management cost can be reduced, and the excessive generation of carbon dioxide can be suppressed.

Hereinafter, embodiments of the heat source water supply system of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.
1 is a hot water system circuit diagram of a heat source water supply system used in the present invention, FIG. 2 is a rear view of a forced agitator in the hot water hot water storage tank of the present invention, and FIG. FIG.

As shown in the hot water system circuit diagram of FIG. 1, hot water boiled to a predetermined temperature (about 60 to 95 ° C.) by a hot water generator 1 composed of a steam boiler, a heat exchanger, or the like is supplied as a primary hot water supply. The hot water storage tank 2 is supplied via the main pipe 10.
The hot water stored in the hot water hot water tank 2 is supplied to the load 3 via the secondary hot water supply main pipe 11. Here, as an example of the load 3, it means various places such as hotels, hospitals, factories, hot bath facilities, and elderly care facilities that use a large amount of hot water.

  Further, the excess hot water used in the load 3 or the hot water requiring reheating returns to the hot water generator 1 or the hot water hot water storage tank 2 via the circulation return pipe 12 in order to reuse the hot water. The circulation return pipe 12 joins with a makeup water pipe 13 that feeds makeup water from the makeup water source 4 at the junction 6 and constitutes a composite return pipe 14 after joining.

  A bifurcating branch 7 is provided at the tip of the composite return pipe 14, and one of the bifurcated parts 7 serves as a first branch pipe 7a and the other serves as a second branch pipe 7b. The first branch pipe 7 a is connected to the hot water generator 1 to supply hot water in the composite return pipe 14 to the hot water generator 1. The second branch pipe 7 b is connected so as to be a supply side pipe of the three-way valve 5, and sends the hot water in the composite return pipe 14 to the three-way valve 5.

  The primary hot water supply main pipe 10 is connected to the three-way valve 5 as another supply side pipe of the three-way valve 5, and the injection pipe 15 is connected as the discharge side pipe of the three-way valve 5. Is connected to the hot water storage tank 2, the hot water fed from the primary hot water supply main pipe 10 and the composite return pipe 14 is controlled by the module 22 of the three-way valve 5, and the open state of each valve is controlled. The temperature-controlled warm water is sent to the warm water hot water tank 2 through the injection pipe 15 in this way.

Note that the mounting position of the secondary hot water supply main pipe 11 in the hot water hot water tank 2 is approximately one third of the height of the hot water hot water tank 2 from the lowest end. The attachment position in the tank 2 is slightly above the attachment position of the secondary hot water supply main pipe 11.
That is, by setting the height of the attachment position of the secondary hot water supply main pipe 11 in the hot water storage tank 2 as described above, the components contained in the water adhere or precipitate in the hot water hot water tank 2 due to a chemical reaction or the like. At this time, by setting the above height condition, the inside of the hot water hot water tank 2 can be kept clean, and the installation position of the injection pipe 15 is provided slightly above the height position, so that the hot water hot water tank 2 prevents the temperature from being lowered.

Further, the hot water storage tank 2 is provided with a temperature sensor 21 for checking the internal hot water temperature and a thermostat 24, and a control circuit 31 is provided between the temperature sensor 21 and the control panel 23, and the thermostat 24 and the control panel 23. There is a control circuit 32 between them, a control circuit 33 between the thermostat 24 and the primary side line pump 8, a control circuit 34 between the module 22 of the three-way valve and the control panel 23, and between the hot water generator 1 and the control panel 23. Is provided with a control circuit 35, and bidirectional control signal exchange is performed between the control circuits 31 to 35, and hot water is sent to the hot water reservoir 2 under appropriate conditions.
Reference numeral 25 denotes a monitoring window for monitoring the state in which the scale is accumulated in the hot water reservoir 2, and reference numeral 26 denotes a thermobarometer.

Next, the forced stirrer 40 installed in the hot water hot water tank 2 will be described.
FIG. 2 is a rear view of the forced agitator 40 in the hot water hot water tank 2, and FIG. 3 is an enlarged view of an arrow A portion in the previous figure.

  Hot water boiled to a predetermined temperature (about 60 to 95 ° C.) by the hot water generator 1 is supplied to the hot water hot water tank 2, and a forced agitator 40 is installed inside the hot water hot water tank 2. The hot water is supplied into the hot water storage tank 2 through the forced agitator 40. The primary line pump 8 for supply installed in the middle of the hot water system circuit detects its control signal via the temperature sensor 21 when the amount of hot water in the hot water storage tank 2 decreases or the temperature decreases. This is a pump for supplying hot water from the hot water generator 1 into the hot water storage tank 2 to warm the hot water. The hot water supplied from the hot water system circuit is configured so that the hot water is supplied to the load 3 that uses the hot water and can be supplied continuously, and the remaining hot water is returned to the circulation return pipe 14.

The hot water generator 1 is always replenished with new makeup water by the function of the makeup water pump 27, and the warm water generated by the warm water generator 1 is supplied to the load 3 that uses the warm water in the above procedure.
The hot water generator 1 is a hot water generator (H.B) that generates hot water of 60 to 95 ° C., and an existing device that is currently widely used corresponds to this.
A primary hot water supply main pipe 10 is attached to the hot water hot water tank 2 that receives the supply of hot water from the hot water generator 1, and the hot water heated to an appropriate temperature passes through the three-way valve 5 and the injection pipe 15. It is guided into a forced agitator 40 installed in the hot water hot water tank 2.
The tip of the injection pipe 15 is composed of an outer pipe 42 and a core pipe 43, and is formed so as to present a double pipe as shown in FIG.

  The injection pipe 15 is connected to the hot water hot water tank 2 at an appropriate height connection position of the hot water hot water tank 2, for example, and the height position is at any of a high place, a middle place, and a low place. It does not matter. However, since it is necessary to ensure the flow rate of the hot water flowing therethrough in the injection pipe 15, it is also necessary to ensure the falling pressure of the hot water in the injection pipe 15 in addition to the pump pressure of the primary line pump 8 described above. Therefore, when the connection position is secured at a high place, it can be configured to be connected to the sorting horizontal portion 46 as it is while maintaining the connection position, but the connection position is secured at the center as shown in FIG. In such a case, or when it is secured in a low place, it is necessary to separately secure a rising portion 45 in the injection pipe 15 in the hot water hot water storage tank 2. It is necessary to configure such that it is once guided to the upper part of the tank 2 and connected to the sorting horizontal part 46 at the upper position.

Next, a first straight portion 47 is formed at each tip of the sorting horizontal portion 46 so as to extend downward from above in the hot water hot water tank 2. One or more first straight portions 47 may be formed, but in order to improve the stirring efficiency of the hot water in the hot water hot water tank 2, it is preferable to use four or more.
As described above, the distribution horizontal portion 46 is formed for the purpose of distributing hot water to the plurality of first straight portions 47.

The tip of the first straight portion 47 is bent into a U-shape to form a first bent portion 48, and the tip of the first bent portion 48 is a second extending upward from below in the hot water storage tank 2. It is formed in the straight part 49, and the tip of the second straight part 49 is further bent into a U shape and formed in the second bent part 50.
At the tip of the second bent portion 50 of the injection pipe 15, an extension pipe portion 51 is disposed that serves as an opening when the hot water is rectified and discharged into the hot water hot water tank 2. That is, the extension pipe part 51 is disposed in the hot water hot water tank 2 so as to extend downward from above.

The length L1 of the extension pipe portion 51 is formed to be 2 to 3 times the length L2 of the second bent portion 50. If the length dimension L1 of the extension pipe part 51 is smaller than twice the length dimension L2 of the second bent part 50, the discharged hot water discharged from the tip of the extension pipe part 51 does not reach the lower part of the hot water storage tank. The convective stirring effect cannot be obtained.
On the other hand, if it is more than 3 times, the reverse head pressure action occurs, the stable discharge of the discharge hot water discharged from the tip of the extension pipe part 51 cannot be obtained (difference between the expansion pressure difference and the head pressure), and the convective stirring effect cannot be obtained. .
Table 1 shows the result of a comparison experiment between the length dimension L1 of the extension pipe portion 51 and the length dimension L2 of the second bent portion 50.

A suction opening 52 for sucking hot water in the hot water storage tank 2 into the first straight portion 47 is formed in a tube wall at a position below the first straight portion 47 of the outer pipe 42 of the injection pipe 15. The shape of the suction opening 52 may be circular, elliptical, or any other suitable shape, but preferably has a low resistance when hot water in the hot water hot water tank flows into the outer pipe 42 (FIGS. 2 and 3). In this example, a suction opening 52 having a circular shape is shown).

On the inner side of the outer tube 42 at a position from the position slightly upstream of the formation position of the suction opening 52 in the first straight portion 47 to the vicinity of the center of the second straight portion 49, a slight gap L3 is formed with the inner wall of the outer tube 42. A core tube 43 is provided to ensure.

Further, a reducer 53 for narrowing the flow of hot water flowing in the outer tube 42 (increasing the flow rate of hot water) is attached to the upstream side of the core tube 43, and further, on the downstream side of the core tube 43, A nozzle 54 that adjusts the discharge pressure of hot water discharged from the core tube 43 (adjusts the flow rate of hot water) is formed. The hot water in the hot water storage tank that has flowed into the gap L3 position from the suction opening 52 is in contact with the outer wall of the core tube 43, receives heat from the hot water passing through the core tube 43, and performs heat exchange. The mixture is stirred and mixed with high-temperature hot water that has passed through the core tube 43 in the second linear portion 49 at the tip of the nozzle 54.

The height position of the tip of the nozzle 54 is disposed at a position that is 100 to 200 mm higher than the height position of the central portion position 55 of the suction opening 52. In FIG. The difference between the position and the height position of the central position 55 of the suction opening 52 is indicated by reference numeral L4.

Here, when the height position of the tip of the nozzle 54 is too lower than the range of the position that is 100 to 200 mm higher than the height position of the central position 55 of the suction opening 52, the hot water is heated at the suction opening 52 section. A reverse flow phenomenon occurs in which the water flows backward from the hot water tank to the injection pipe 15.
On the other hand, if it is too high, the heat transfer action value is lowered, resulting in a problem that the mixing ratio of hot water is lowered. Table 2 shows the results of a comparative experiment example based on the relationship between the height position of the tip of the nozzle 54 and the height position of the central portion position 55 of the suction opening 52.

Next, in the present invention, the opening area of the suction opening 52 is formed to be 2 to 3 times the opening area of the nozzle.
Here, when the opening area of the suction opening 52 is too smaller than a range that is 2 to 3 times the opening area of the nozzle, the amount of hot water sucked from the suction opening 52 is insufficient, and the mixing contrast is insufficient. Therefore, the discharge temperature cannot be stabilized.
On the other hand, if it is too large, the amount of hot water sucked from the suction opening 52 becomes too large, resulting in a decrease in heat exchange efficiency in the injection pipe 15 and the function cannot be exhibited.
Table 3 shows the results of a comparative experiment example based on the relationship between the opening area of the suction opening 52 and the opening area of the nozzle.

In the present invention, instead of a hot water hot water storage tank that stores hot water using hot water of 60 to 95 ° C. as a heat source, a hot water hot water storage tank that stores hot water using low pressure steam of ² kg / cm ² or less as a heat source can be used. Even in the case of low-pressure steam, as in the case of hot water, since no bubbles are generated in the hot water unlike high-pressure steam, there is a feature that the conventional problem does not occur at all.

  Further, in the present invention, even if the first straight portion of the outer tube is formed by one, it can be implemented without any problem, but it can also be formed to branch into a plurality of cases, in which case the heat exchange rate is improved. There is a feature to do.

  Also, if the installation position of the extension pipe part is closer to the inner side when viewed from the outer peripheral wall side of the hot water storage tank than the first straight part of the outer pipe, the stirring of the hot water in the hot water tank is uniform and efficient. There is a feature that can be done.

  INDUSTRIAL APPLICABILITY According to the present invention, it can be used in the field of handling hot water hot water tanks installed in various places such as hotels, hospitals, factories, hot bath facilities, and elderly care facilities that use a large amount of hot water.

It is a hot water system circuit diagram of the heat source water supply system used in the present invention. It is a rear view of the forced stirrer in the hot water hot water storage tank of this invention. It is an enlarged view of the arrow A part in a previous figure.

1 Hot water generator 2 Hot water hot water tank 3 Load (various places where hot water is used)
4 Supply water source 5 Three-way valve 6 Junction part 7 Branch part 7a First branch pipe 7b Second branch pipe 8 Primary side line pump 10 Primary hot water supply main pipe 11 Secondary hot water supply main pipe 12 Circulation return pipe 13 Supply water pipe 14 Composite Return pipe 15 Injection pipe 21 Temperature sensor 22 Three-way valve module 23 Control panel 24 Thermostat 25 Monitoring window 26 Thermobarometer 27 Supply water pumps 31 to 35 Control circuit 40 Forced stirrer 42 Outer pipe 43 Core pipe 45 Rising part 46 Sorting horizontal part 47 First straight part 48 First bent part 49 Second straight part 50 Second bent part 51 Extension pipe part 52 Suction opening 53 Reducer 54 Nozzle 55 Center part position L1 of extension part L2 Extension pipe part length dimension L2 Length L3 The gap between the outer tube and the core tube L4 The difference between the height of the tip of the nozzle and the height of the center of the suction opening

Claims (3)

In a heat source water supply system for storing hot water generated by the hot water generator 1 in the hot water hot water tank 2 and supplying the hot water from the hot water hot water tank 2 to the load 3 for the purpose of warm water,
A primary hot water supply main pipe 10 from the hot water generator 1 to the hot water hot water tank 2 is provided, a secondary hot water supply main pipe 11 from the hot water hot water tank to the load 3 is provided, and the hot water generator 1 or the hot water hot water tank from the load 3 is provided. 2 is provided with a circulation return pipe 12 that returns to 2 and a makeup water pipe 13 that leads from the makeup water source 4 to the warm water generator 1 or the warm water hot water storage tank 2,
A three-way valve 5 is attached to the primary hot water supply main pipe 10,
The circulation return pipe 12 and make-up water pipe 13 are joined at the joining section 6 to form a composite return pipe 14, a branch section 7 is provided at the tip of the composite return pipe 14, and the first branch pipe 7 a of the branch section 7 is provided. Is connected to the hot water generator 1, the second branch pipe 7 b of the branch section 7 is connected to be the supply side pipe of the three-way valve 5, and the primary hot water supply is made to be the other supply side pipe of the three-way valve The main pipe 10 is connected, and an injection pipe 15 for injecting hot water into the hot water hot water tank 2 is connected so as to be a discharge side pipe of the three-way valve,
A heat source water supply system comprising: a three-way valve module 22 and a control panel 23 for transmitting a control signal to the hot water generator 1 by detecting with a temperature sensor 21 in the hot water storage tank 2.   The heat source water supply system according to claim 1, wherein a forced agitator is provided in the hot water storage tank. The mounting position of the secondary hot water supply main pipe 11 in the hot water hot water tank 2 is approximately one third of the height of the hot water hot water tank 2 from the lowest end, and the hot water hot water tank 2 of the injection pipe 15 is The heat source water supply system according to claim 1 or 2, wherein the attachment position is located slightly above the attachment position of the secondary hot water supply main pipe (11).

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