JP2010175207A - Electric type liquid heating and feeding device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric type heating and feeding device capable of providing high heat transfer efficiency of an electric heater to water, capable of evenly heating a whole amount of liquid in a liquid storage tank, and capable of sending the liquid to an exterior in a large amount for a predetermined time while retaining a desired temperature. <P>SOLUTION: The electric type heating and feeding device 10 includes the liquid storage tank 11, and the electric heater 13 equipped in the liquid storage tank 10, and the liquid w fed and stored in the liquid storage tank 11 is heated by the electric heater 13, taken out to an exterior, and used for suitable purposes. The device includes a circulating liquid introduction pipe 17 provided piercing a tank wall of the liquid storage tank 11, extending inward, and having an open inner end, a circulation passage 15 taking out the liquid in a position sufficiently away from the inner end of the circulating liquid introduction pipe 17 of the tank wall of the liquid storage tank 11 and returning it into the pipe from an outer end part of the circulating liquid introduction pipe 17, and a circulating pump 16 interposed in the circulation passage 15. It is composed such that a heating part 13a of the electric heater 13 is inserted into the circulation liquid introduction pipe 17 and the liquid returning into the pipe is heated. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electric liquid heating and supplying apparatus and method for supplying a liquid to a liquid storage tank, heating the liquid with an electric heater, and taking out the heated liquid to the outside.

  Conventionally, a large-scale apparatus for heating a liquid such as boiling a large amount of hot water relies on heavy oil, kerosene, and gas for most of the fuel. However, these fuels have the problem that the cost fluctuates greatly due to price fluctuations and that carbon dioxide emissions are also a major cause of environmental pollution. Therefore, there is a demand for a liquid heating device using electricity as a fuel to replace heavy oil, kerosene, and gas. However, electric energy is generally more expensive than fuels such as heavy oil, kerosene, and gas.

  Therefore, an electric heater is provided in the liquid storage tank, the liquid supplied to the liquid storage tank is heated by the electric heater, and thereafter, the liquid is taken out to the outside, and an energization control means for midnight power using surplus midnight power is provided, Several electric liquid heating and supplying apparatuses that attempt to eliminate or reduce the problem of energy cost have been proposed (see, for example, Patent Documents 1 to 3).

  Patent Document 1 discloses a heat storage device, a first hot water tank, and a second hot water tank. The heat storage device heats and circulates the sealed air with an electric heater that uses midnight power, and heats the water circulating through the first hot water tank and the heat exchanger with the heat of the heated air. The second hot water tank is equipped with an electric heater that uses common power, a ball tap that is supplied with hot water from the second hot water tank, and hot water supplied from the second hot water tank is further heated to a desired temperature with an electric heater. It is the structure which supplies hot water from a water heater tap.

  Patent Document 2 shows a heat pump system that uses midnight power and a hot water storage tank that includes an electric heater that uses midnight power, and fills the hot water storage tank with water before using midnight power. In the first half of the midnight hours, the heat generated by the refrigerant in the heat pump system is transferred to the water circulating in the hot water storage tank using an external heat exchanger, and the heated water flows into the lower part of the hot water storage tank and rises upward by convection. Then, the temperature of the hot water storage tank is gradually raised from the upper part, and in the latter half of the midnight time zone, the hot water stored in the hot water storage tank is further heated by an electric heater, and the hot water storage tank is heated and stored at a desired temperature.

  Patent Document 3 discloses a hot water storage tank that includes an electric heater that switches between daytime power and late-night power and whose electric output is controlled in accordance with a temperature difference between a feed water temperature and a tapping temperature. When the hot water stored by the midnight power is exhausted, the power is replenished by using daytime power.

JP-A-8-28964 Japanese Patent Laid-Open No. 10-89766 JP-A-5-157352

  However, since the thermal efficiency of the electric heater with which the hot water tank is equipped is low in what was described in patent documents 1-3, increasing thermal efficiency is desired. More specifically, the water or hot water in the hot water storage tank comes into contact with the electric heater and the water becomes heated hot water, expands its volume, decreases its specific gravity, and rises. When the heated hot water rises and leaves the electric heater, the lateral water contacts the electric heater upward and is heated to become hot water. Thus, since the movement of the water or hot water around the electric heater is slow and the amount is small, the electric heater can heat only the surrounding water and cannot heat the water at a distant position at all. The hot water heated by the electric heater reaches the water surface and spreads horizontally, and when the hot water that reaches the water surface spreads horizontally, it is located in the lower layer, so the water in the hot water tank is at the highest temperature and the lower layer is large. It has a temperature gradient and is distributed low in temperature.

According to such an electric liquid heating and supplying apparatus, (1) since the total amount of hot water in the hot water storage tank cannot be heated uniformly, the temperature at which the hot water heated from the upper layer is heated to the outside is higher than the desired temperature. Is too expensive. (2) The total amount of hot water in the hot water tank cannot be heated uniformly, and the efficiency of heat transfer to the water of the electric heater that reheats is poor. Even forced to supply hot water at a lower temperature.
Therefore, the conventional electric liquid heating and supplying apparatus cannot be applied as a system that requires a large amount of supply of hot water over a long period of time at a uniform temperature.

  The present invention has been devised in view of the above points, and the object of the present invention is to obtain a high heat transfer efficiency to the liquid of the electric heater and to uniformly heat the entire amount of the liquid in the liquid storage tank. It is an object of the present invention to provide an electric liquid heating and supplying apparatus capable of taking out a large amount of liquid heated to a constant temperature for a long time without lowering the temperature while supplying a stock solution.

  In order to solve the above problems, an electric liquid heating and supplying apparatus according to the present invention includes a liquid storage tank, a raw liquid supply port for supplying liquid to the liquid storage tank, and a heat generating portion provided in the liquid storage tank. In an electric liquid heating and supplying apparatus comprising: an electric heater for heating the liquid stored in a liquid tank; and a heated liquid outlet for taking out the heated liquid heated by the electric heater in the liquid storage tank. A liquid is taken out from the liquid storage tank to form a circulating liquid, and the circulation liquid is returned to the liquid storage tank from another position and a circulation pump interposed in the circulation path. A pipe line portion for returning the circulating liquid into the liquid storage tank extends through the tank wall of the liquid storage tank and extends into the liquid storage tank so that the inner end is opened, thereby forming a circulating liquid introduction pipe. The electric heater has a heat generating portion provided inside the circulating liquid introduction pipe. Heating the circulating liquid flowing through the liquid introducing tube, characterized in that.

  The electric liquid heating and supplying method of the present invention supplies a liquid to a liquid storage tank, heats the liquid with an electric heater, takes out the heated liquid to the outside from a heated liquid external outlet, and uses it for an appropriate purpose. In the electric liquid heating and supplying method, the heating part of the electric heater is inserted into a circulating liquid introduction pipe provided through the tank wall of the liquid storage tank and extending into the liquid storage tank and having an inner end opened, The liquid stored in the liquid storage tank is taken out from one part of the liquid storage tank and returned to the pipe from the outer end portion of the circulating liquid introduction pipe to circulate, and the heat of the electric heater is generated in the circulating liquid introduction pipe. It is made to contact and flow through a part, and is heated and returned in the liquid storage tank.

  According to the present invention, the liquid stock solution supplied from the stock solution supply port to the liquid storage tank is heated and circulated by the electric heater and warmed many times, and then taken out from the heated liquid take-out port. The mechanism for heating the liquid is composed of a circulating liquid introduction pipe, an electric heater, and a circulation path including a circulation pump. That is, the low temperature liquid in the tank is taken out to the circulation path by a circulation pump, led to the circulation liquid introduction pipe, returned to the deep inside of the liquid storage tank through the circulation liquid introduction pipe, and this is repeated to perform circulation, The liquid to be returned to the liquid storage tank through the circulating liquid introduction pipe is brought into contact with the electric heater provided inside the circulating liquid introduction pipe in a turbulent state and heated several times to be mixed (kneaded flow). is there. The amount of heat transferred to the liquid of the electric heater under the condition that the electric heater heat generation amount is the same, the lower the temperature of the liquid in contact, the greater the heat transfer and the larger the amount of heat transfer, and the liquid in contact with the electric heater. The flowing liquid has a larger heat transfer and a larger heat transfer amount than when the liquid stays, and when the temperature of the liquid in contact with the electric heater is close to the electric heater temperature, the heat transfer is small and the heat transfer amount is smaller. small. In the present invention, the circulating liquid introduction pipe is provided in the liquid storage tank, the electric heater is installed in the circulating liquid introduction pipe, and the circulating liquid is caused to flow in the circulating liquid introduction pipe, so that the amount of heat transfer from the electric heater to water is reduced. Keep big. That is, since the circulating liquid is heated by the electric heater provided inside the circulating liquid introduction pipe, the circulating liquid circulating in the circulating liquid introduction pipe becomes a turbulent flow and is repeatedly contacted and heated by the heat generating portion of the electric heater. The temperature of the liquid mixed and in contact with the liquid is not heated locally, the temperature distribution in the cross section perpendicular to the flow direction is constantly averaged, and the number of times of contact with the heating part of the electric heater as it goes downstream in the flow direction Increases proportionally and the temperature rises. Since the heat generating part of the electric heater heats the circulating liquid, high heat transfer efficiency to the circulating liquid is obtained, and the temperature of the liquid in the liquid storage tank gradually increases as a whole. In the process of circulating in the circulating liquid introduction pipe, the water temperature is averaged and the liquid flowing in the liquid storage tank is further mixed in the liquid storage tank to become a circulating flow, and the liquid temperature is averaged at any position in the entire tank. In the case where the liquid storage tank has a cylinder shape, if an electric heater is installed in the lower part of the liquid storage tank, the liquid that is circulated through the circulating liquid introduction pipe and heated will flow to the liquid in the tank. The liquid temperature in the entire tank is averaged by mixing all over. In the case where the liquid storage tank has a rectangular parallelepiped shape, when the liquid is circulated through a circulation path provided with a partition wall in the tank to form a meandering passage and communicated with both ends of the meandering passage, When flowing into the tank, it flows through the meandering passage and circulates many times, so it mixes and averages the liquid temperature throughout the tank. In this way, the entire amount of liquid in the liquid storage tank can be heated uniformly, and the liquid heated to a constant temperature can be taken out over a long period of time without lowering the temperature even while supplying the stock solution.

  Furthermore, in order to solve the above-mentioned problems, the present invention includes a circulating liquid introduction pipe separated from the liquid storage tank, and an electric heater assembled in a state where a heat generating portion is inserted into the circulating liquid introduction pipe. Includes a heater assembly. In the heater assembly, the circulating liquid introduction pipe may be configured to be fitted into the tank wall of the liquid storage tank and welded to the entire circumference thereof, or may be provided with a pair of flanges on the tank wall side and the pipe side. It is also possible to employ a configuration in which a liquid seal packing is interposed between and fixed. Further, the heater assembly may include a pair of flanges on the circulating liquid introduction pipe side and the electric heater side, and may be connected and fixed with a liquid seal packing interposed between the flanges.

  According to the present invention, the electric heater is housed in the circulating liquid introduction pipe that penetrates the tank wall of the liquid storage tank, and the liquid in the liquid storage tank is returned to the circulating liquid introduction pipe. The heat generation part of the electric heater is contacted in a turbulent state, and the heat transfer efficiency of the electric heater to the liquid is much higher than that of the electric heater of the conventional mounting structure, and can be circulated in the liquid storage tank. Providing an electric liquid heating and supply device that can uniformly heat the entire liquid in the liquid tank and supply a large amount of liquid heated to a constant temperature without lowering the temperature while supplying the stock solution. can do.

It is related with the electric-type liquid heating supply apparatus of 1st Embodiment, (a) is a whole longitudinal front view. (B) is a principal part cross-sectional schematic for demonstrating the effect | action of an apparatus. It is a front view which shows a part of electric liquid heating and supplying device concerning a 2nd embodiment in section. FIG. 3 is a plan view showing a part of the electric liquid heating and supplying apparatus of FIG. 2 in cross section. It is the IV-IV arrow line view in FIG. It is a figure which shows the state which pulled out the electric heater of the electric type liquid heating supply apparatus of FIG. It is a front view which shows a part of electric liquid heating supply device concerning a 3rd embodiment in section. It is a VII-VII arrow line view in FIG. It is a top view which shows a part of electric liquid heating supply apparatus of FIG. 6 in cross section. It is a figure which shows the state which pulled out the electric heater from the state of FIG. It is a front view which shows a part of electric liquid heating supply device concerning a 4th embodiment in a section. FIG. 10 is a side view showing a cross section of a part of an electric liquid heating and supplying apparatus according to a fifth embodiment.

  Hereinafter, an electric liquid heating and supplying apparatus and method according to an embodiment of the present invention will be described with reference to the drawings.

[Basic configuration]
A basic configuration common to an electric liquid heating and supplying apparatus and method of a plurality of embodiments described below will be described with reference to FIG. As shown in FIG. 1 (a), an electric liquid heating and supplying apparatus 10 includes a liquid storage tank 11, and the liquid storage tank 11 includes a stock liquid supply port 12, an electric heater 13, and a heating liquid outlet 14. A circulation path 15, a circulation pump 16, and a circulating liquid introduction pipe 17 are attached. In the present application, a functional component assembly in which the electric heater 13 separated from the liquid storage tank 11 and the circulating liquid introduction pipe 17 are combined is referred to as a heater assembly.

  When the liquid storage tank 11 has a cylinder shape, it is not necessary to have a meandering passage serving as a circulation path for the stored liquid. When the liquid storage tank 11 has a rectangular parallelepiped shape and a meandering passage is formed, the meandering is necessary. A passage shall be formed.

  The stock solution supply port 12 is an inlet for supplying the stock solution L1 stored in the storage tank 11. It is preferable to provide a ball tap 12a at the stock solution supply port 12 to supply the stock solution L1, but the liquid level may be managed by other means. The heated liquid outlet 14 is an outlet for taking out and using the heated liquid L2 heated by the electric heater 13 in the liquid storage tank 11. The stock solution supply port 12 and the heated liquid outlet 14 are directly provided in the liquid storage tank 11 in FIG. 1A, but may be provided for the circulation path 15, for example.

  The electric heater 13 is a means for heating the circulating liquid stored in the liquid storage tank 11 with the heat generating portion 13 a provided in the circulating liquid introduction pipe 17.

  The circulation path 15 is connected to the liquid storage tank 11 at a position away from the inner end opening of the circulating liquid introduction pipe 17 through the circulating liquid outlet 15 d for taking in the circulating liquid, and the other end opening is connected to the outer end portion of the circulating liquid introduction pipe 17. It is communicated to. The circulation pump 16 takes out the liquid w in the liquid storage tank 11 from the circulation liquid outlet 15d and causes the liquid w to flow through the circulation path 15 and into the pipe from the outer end of the circulation liquid introduction pipe 17. It plays a role to circulate. When the circulating liquid outlet 15d is a cylinder-shaped liquid storage tank 11 as shown in FIG. 1, it is not necessary to form a meandering passage, and it is sufficient to provide it at an appropriate position where the liquid temperature of the liquid storage tank 11 is low. As shown in FIG. 2, when the liquid storage tank 11A has a rectangular parallelepiped shape, it is necessary to form a meandering passage, and the meandering passage is formed with the partition plate 22, and at this time, it is provided near the end of the meandering passage. It is preferred that The circulation path 15 is provided with a circulation amount adjusting gate valve 15b so that the flow rate can be adjusted by adjusting the opening of the valve.

  The circulating liquid introduction pipe 17 is a flow path forming body that houses the heat generating portion 13a of the electric heater 13 and causes the circulating liquid to contact the heat generating portion 13a and flow along the heat generating portion 13a. The electric heater 13 heats the circulating liquid that has a heat generating portion 13a provided inside the circulating liquid introduction pipe 17 and flows through the circulating liquid introduction pipe 17 (see FIG. 1B). The circulating liquid introduction pipe 17 penetrates the tank wall, extends deeply into the tank and is opened in its inner end, and the inner end cylindrical portion 17b has a smaller diameter as it goes forward. It is preferable that the flow rate of the liquid is increased to cause a mixed flow state to flow into the liquid storage tank 11. The circulating liquid introduction pipe 17 is provided with an opening in the liquid storage tank 11 and is inserted through the opening and welded to the tank wall. However, the circulating liquid introduction pipe 17 may be provided with a flange and fixed to the flange provided on the tank wall by bolting.

  The liquid w that can be handled by the electric liquid heating and supplying apparatus 10 is not limited to tap water. The electric liquid heating and supplying device 10 is not only used as a hot water supply device for beverages and bathing, but also for a hot water supply device for home baths using tap water, and a large-scale bathhouse using hot spring water and mineral spring water. It can be used as a hot water supply device. Moreover, although it can use for the hot water supply apparatus for warm water heating systems using the middle water in house cultivation or a passenger car, after using the heat of middle water, it is made to return to a water supply source. Furthermore, it can be used in a system that circulates and uses other liquids such as oil.

  The power supplied to the circulation pump 16 and the electric heater 13 is preferably midnight power with low cost. The late-night power utilization unit shown in FIG. 1A includes a power source 30, a power switching unit 31, and a battery 32. The power switching means 31 inputs midnight power from the power source 30 in the midnight time zone where the power cost is cheap, and outputs it to the electric heater 13, the circulation pump 16, the heating liquid extraction pump 14 b, and the battery 32. The electric liquid heating / supplying device 10 supplies cheap electric power at midnight to the electric heater 13 and the circulation pump 16, and the liquid in the liquid storage tank 11 is heated to a set temperature in the midnight time zone. When the liquid in the liquid storage tank 11 is heated to the set temperature, the power switching means 31 is connected to the electric heater 13, the circulation pump 16, and the heating liquid take-out pump 14b based on the detection signal of the temperature detection device 11d that detects this. Power supply is stopped. If the heating liquid L2 is taken out from the heating liquid outlet 14 at midnight and the undiluted solution L1 is supplied from the ball tap 12a like a late-night hot spring center, the electric heater 13, the circulation pump 16, and the heating liquid are supplied. The power supply to the extraction pump 14b is not stopped. On the other hand, the power switching means 31 stores electricity in the battery 32 separately from the power supply to the electric heater 13 and the circulation pump 16 in the midnight time zone. The power switching means 31 stops the power supply to the battery 32 after the midnight time zone when the power cost is cheap, and supplies the electric power stored in the battery 32 to the electric heater 13, the circulation pump 16, and the heating liquid extraction pump 14b. The circuit connection is switched. Further, the power switching means 31 switches the circuit connection so that the normal power is supplied to the electric heater 13, the circulation pump 16, and the heating liquid take-out pump 14b when the battery 32 has no stored power. When the supply of the stock solution L1 is stopped and the heated liquid L2 is not taken out and the temperature of the liquid in the liquid storage tank 11 rises to the set temperature, the electric heater 13, the circulation pump 16, and the heated liquid are switched from the power switching means 31. Power supply to the extraction pump 14b is not performed.

[Action / Effect]
First, the stock solution L1 flows from the stock solution supply port 12 into the storage tank 11 and is stored to the liquid level management level. Next, midnight power is supplied to the circulation pump 16 and the electric heater 13 to heat the stock solution L1 in the liquid storage tank 11 to a set temperature. When the circulation pump 16 operates, the liquid w in the tank flows through the circulation path 15 and the circulation liquid introduction pipe 17 from the circulation liquid outlet 15d and returns to the deep inside of the liquid storage tank 11. The liquid flowing through the circulating liquid introduction pipe 17 is brought into contact with the electric heater 13 in a turbulent state and heated many times to become a mixed flow (kneading flow), and heat transfer from the electric heater 13 to the liquid is performed with high heat transfer efficiency. Done and heated. In this way, the liquid flowing through the circulating liquid introduction pipe 17 becomes turbulent and repeatedly heated in contact with the electric heater 13 to be mixed and the temperature distribution in the cross section perpendicular to the flow direction is constantly averaged and goes downstream in the flow direction. As the number of times and time of contact of the electric heater 13 with the heat generating portion 13a increase proportionally, the temperature rises. The liquid in the liquid storage tank 11 becomes a circulation flow again and is repeatedly heated by the electric heater 13. Thereby, the temperature of the liquid in the liquid storage tank 11 that averages the liquid temperature at any position in the entire tank gradually increases to the set temperature as a whole. After the temperature of the liquid in the liquid storage tank 11 rises to the set temperature, the heated liquid L2 can be taken out from the heated liquid take-out port 14 and used. The stock solution L1 supplied from is replenished as the heating liquid L2, and the heating liquid L2 is generated without temperature change and maintained at the set temperature.

  According to this configuration, after the stock solution is fully stored in the liquid storage tank 11 and heated to the set temperature by the electric heater 13, the heating liquid extraction valve 14c is opened and the heating liquid extraction pump 14b is operated to take out the heating liquid L2. . Even if the heated liquid L2 is taken out for a long time, the heated liquid L2 heated to a set temperature, for example, 43 ° C., can be taken out, and can be used for baths and hot springs. In addition, it can also adjust so that setting temperature may be set to 100 degreeC by adjusting the output of the electric heater 13. FIG. Furthermore, the entire liquid in the liquid storage tank 11 can be heated uniformly, and the liquid heated to a constant temperature can be taken out over a long period of time without lowering the temperature while supplying the stock solution.

  According to this configuration, the entire amount of liquid in the liquid storage tank can be heated uniformly, and the liquid can be taken out in a large amount for a long time while maintaining the liquid at a uniform desired temperature. The efficiency of heat transfer from the electric heater to the liquid is improved. Since the heat transfer efficiency to the liquid of the electric heater 13 is high because it is high, the cost per calorie can be reduced equally compared to oil or gas when using low-cost power at low cost. When the cost increases, the present invention becomes cheaper. Moreover, according to the said structure, by providing the straight tubular circulating liquid introduction pipe | tube 17 and the rod-shaped electric heater 13, the circulation liquid and a mixed flow are given to the liquid in the liquid storage tank 11, and the whole quantity of liquid is made uniform temperature. In addition, since high heat transfer efficiency can be obtained, the heating rate of the liquid in the liquid storage tank 11 can be increased, and the output of the electric heater 13 and the output of the circulation pump 16 can be adjusted to store the liquid. It is very easy to adjust the set heating temperature of the liquid in the liquid tank 11. Furthermore, according to this configuration, the structure of the apparatus is not difficult, the accumulation of scale on the heat generating portion 13a of the electric heater 13 is kept small for a long period of time, and the electric heater 13 is adopted, so that maintenance is easy.

[First Embodiment]
FIG. 1 shows an electric liquid heating and supplying apparatus 10 according to the first embodiment. In the electric liquid heating and supplying apparatus 10, a liquid storage tank 11 is formed by welding end plates on the upper and lower sides of a cylindrical body, and is installed on a gantry 19. The outer surface of the liquid storage tank 11 is preferably covered with a heat insulating covering. A single circulating liquid introduction pipe 17 is inserted into the liquid storage tank 11 so as to extend horizontally inwardly from a hole opened at a low position on the side wall of the liquid storage tank 11, and the side wall penetration portion is welded. . The circulating liquid introduction tube 17 includes a straight tube portion 17a that houses the electrode portion 13b of the electric heater 13, a tapered cylindrical inner end tube portion 17b that is bent obliquely upward and has a small diameter toward the tip, and a straight tube portion 17a. A flange (heater support part) 17c provided at the outer end of the straight pipe part 17a and a circulating liquid inlet 17d provided at the outer end part of the straight pipe part 17a are provided. The inner end cylindrical portion 17b of the circulating liquid introduction pipe 17 is bent so that the closing means 18 can be easily installed and the liquid w1 flows upward. The circulating liquid introduction pipe 17 may be attached to the side wall of the liquid storage tank 11 by bolting instead of welding.

  A blocking means 18 is provided in a portion of the side wall of the liquid storage tank 11 facing the inner end cylindrical portion 17 b of the circulating liquid introduction pipe 17. The closing means 18 accommodates the valve body 18a having a conical surface, the shaft 18b supporting the valve body 18a and having a male screw, the hand handle 18c fixed to the outer end of the shaft 18b, and the shaft 18b in an inserted state. And a supporting cylinder portion 18d having a female screw threadedly engaged with the male screw of the shaft 18b and having a shaft sealing means for preventing liquid leakage. When the electric heater 13 is pulled out, the closing means 18 turns the handwheel handle 18c to seat the valve body 18a on the inner end cylindrical portion 17b of the circulating liquid introduction pipe 17 so as to close the valve, and the circulation amount adjusting partition valve 15b is opened. By closing the valve, even if the electric heater 13 is pulled out, the liquid in the liquid storage tank 11 can be prevented from flowing out through the circulating liquid introduction pipe 17. That is, even if the total amount of liquid in the liquid storage tank 11 is not drained, the scale attached to the heat generating portion 13a can be wiped out by pulling out the electric heater 13, and high heat transfer efficiency can be maintained. For this reason, in the case of heating the hot spring water, there is a convenience in which cleaning of the circulating liquid introduction pipe 17 and wiping of the scale attached to the heat generating portion 13a of the electric heater 13 can be performed in a short time. In the present invention, the turbulent liquid flows in contact with the heat generating portion 13a of the electric heater 13, so that the scale does not easily adhere to the heat generating portion 13a as compared with the conventional mounting structure.

  The electric heater 13 includes a rod-shaped heat generating portion 13a, a flange (electric heater mounting portion) 13c, and an electrode portion 13b. In the electric heater 13, the heat generating part 13a is inserted from the outer end opening of the circulating liquid introduction pipe 17, the flange 13c is bolted to the flange 17c, and the center of the heat generating part 13a is aligned with the straight pipe part 17a. The power source 30, which is a midnight power utilization means, the power switching means 31, and the battery 32 are electrically connected to the electrode portion 13b. The circulating liquid introduction pipe 17 and the electric heater 13 are provided so that liquid does not leak.

  In this embodiment, the circulating liquid outlet 15d is provided at the center of the lower surface of the liquid storage tank 11 so that the liquid having the lowest temperature in the liquid storage tank 11 can be taken out.

  The liquid storage tank 11 includes a temperature detection device 11d for detecting the temperature of the liquid and stopping the electric heater 13 to prevent an abnormality, drain pipes 20a to 20c for removing liquid from various parts of the piping, and an opening / closing device. The drain valve 21a, 21b, the overflow port 20 for preventing the rise of the pressure of the liquid storage tank 11 which may occur when the liquid level is excessively increased due to an accident or any other cause are provided. The liquid flowing through the drain pipes 20a to 20c flows into the drainage basin 21c. In addition, since it cannot flow when the liquid is oil or the like, it is recovered in a recovery tank (not shown).

  In this configuration, the electric heater 13 can be pulled out for maintenance and replacement. That is, the inner end cylindrical portion 17b of the circulating liquid introduction pipe 17 is closed by the closing means 18, and the drain valves 21a and 21b are opened to drain the liquid in the circulating liquid introduction pipe 17, the circulation path 15, and the drain pipes 20b and 20c. The electric heater 13 that can be drawn and pulled out through the eaves 21c can be removed. Also in this embodiment, the electric heater 13 may be provided with a heat radiating fin, which will be described later.

  The stock solution supply port 12 is provided with a ball tap 12a. The ball tap 12a closes the stock solution supply port 12 when the liquid level is the same as or above the stock solution supply port 12, and opens the stock solution supply port 12 when the liquid level falls, thereby automatically feeding the stock solution. Has function. Further, when the liquid level falls below the stock solution supply port 12, the supply flow rate of the stock solution increases in accordance with the drop of the liquid level, that is, the inclination of the ball tap 12a. It also has a liquid level control function. The maximum supply amount of the stock solution L1 by the ball tap 12a is set to be larger than the maximum liquid supply amount by the heated liquid take-out pump 14b, which will be described later, and prevents emptying due to excessive reduction of the liquid. ing.

  The heated liquid outlet 14 is installed near the upper part of the liquid storage tank 11. A heated liquid outlet pipe 14a is connected to the heated liquid outlet 14 and a heated liquid outlet pump 14b and a heated liquid outlet valve 14c are arranged in the heated liquid outlet pipe 14a.

It is assumed that the stock solution is fully stored in the liquid storage tank 11 and heated to the set temperature by the electric heater 13, then the heated liquid take-off valve 14c is opened and the heated liquid take-out pump 14b is operated to take out the heated liquid L2. Even if the heated liquid L2 is taken out for a long time, the heated liquid (water) L2 heated to a set temperature, for example, 43 ° C to 45 ° C, can be taken out and used as a bath or hot spring water. A liquid having a low temperature gathers in the lower layer in the liquid storage tank 11, is taken into the circulation path 15 from the circulation liquid outlet 15 d, becomes a circulation flow, and is led into the circulation liquid introduction pipe 17. The liquid flowing through the circulating liquid introduction pipe 17 is heated by the electric heater 13 and flows into the liquid storage tank 11 from the inner end cylindrical portion 17b of the circulating liquid introduction pipe 17 to become an upward flow f1.
Thus, the entire amount of the liquid in the liquid storage tank 11 is circulated and heated to a set temperature at which the temperature distribution in the vertical direction does not change significantly.

  According to this embodiment, since the electric heater 13 can be pulled out in the horizontal direction, maintenance such as removal of scale adhering to the electric heater 13 and replacement of the electric heater 13 is possible. By closing the opening of the inner end cylinder part 17b when the electric heater 13 is pulled out, the liquid does not leak even if the outer end part of the circulating liquid introduction pipe 17 is opened in order to pull out the electric heater 13, and the liquid quantity does not leak. First, maintenance by pulling out the electric heater 13 becomes possible. Since the electric heater 13 can be pulled out from the side of the liquid storage tank 11, a space for maintenance is not required above the liquid storage tank 11, and can be installed in a narrower space.

[Second Embodiment]
2 to 5 show an electric liquid heating and supplying apparatus 10A according to a second embodiment of the present invention. In addition, description of a basic structure is abbreviate | omitted, and the same component as 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  The liquid storage tank 11A includes a liquid storage tank body 11a that is welded and assembled into a rectangular parallelepiped shape using a steel plate, a stainless steel plate, or the like, and a heat insulating covering body 11b that covers the outside of the liquid storage tank body 11a. In the liquid storage tank main body 11a, a meandering path meandering in plan view is formed by a plurality of vertically standing partition plates 22, and the circulating liquid flowing into the liquid storage tank main body 11a from the circulating liquid introduction pipe 17A flows in a meandering manner. f2.

  The circulating liquid outlet 15d is provided in the lower part of the tank wall near the end of the meandering path. When the circulating liquid outlet 15d is provided at this position, it becomes easy to form a meandering flow in which the liquid in the liquid storage tank main body 11a circulates uniformly, and a liquid having a low temperature can be taken into the circulation path 15. In this embodiment, a filter 15c for removing dust and scales is provided between the circulation amount adjusting gate valve 15b and the circulation pump 16. The circulation path 15 is connected in communication with the horizontal header pipe 15a, and four branch pipes provided in the horizontal header pipe 15a are connected in communication with the circulating liquid introduction port 17d of the circulating liquid introduction pipe 17A (see FIG. 3).

  In particular, in this embodiment, the circulating liquid introduction pipe 17A is suspended so as to penetrate the ceiling wall 11c of the liquid storage tank 11A and the inner end of the pipe is at a deep position in the tank (see FIGS. 2 and 4). 13A is detachably fixed to the flange 17c of the circulating liquid introduction pipe 17A so that it can be pulled out above the liquid storage tank 11A (see FIG. 5). In this embodiment, a plurality of sets (four sets in the illustrated example) of the circulating liquid introduction pipe 17A and the electric heater 13A are provided, and a heating liquid with a large flow rate can be generated. Since the circulating liquid introduction pipe 17A is suspended from the ceiling wall 11c, the electric heater 13A can be pulled out in the vertical direction (see FIG. 5). Since the circulating liquid introduction pipe 17A is suspended from the ceiling wall 11c of the liquid storage tank 11A and the electric heater 13A is pulled out in the vertical direction, the electric heater 13A can be connected without draining the entire amount of the heating liquid in the liquid storage tank 11A. Since the heated liquid in the liquid storage tank 11A does not spill out from the circulating liquid introduction pipe 17A even if it is pulled out, maintenance can be performed in a short time. This is particularly convenient when the heating liquid is a liquid such as oil that cannot be discarded. Furthermore, in this embodiment, since the electric heater 13A can be inserted from the outer end opening of the circulating liquid introduction pipe 17A, the heat generating portion 13a of the electric heater 13A is provided with the heat radiating fins 13d to increase the heat transfer efficiency. . Note that the heat dissipating fins 13d may not be provided.

  The inner end cylindrical portion 17b of the circulating liquid introduction pipe 17A is provided in opposition to the turbulent flow plate 23 located near the inner corner surface of the tank and provided at the inner corner surface of the tank. The turbulent flow plate 23 serves to stir the liquid flowing through the circulating liquid introduction pipe 17A and flowing into the tank from the inner end cylindrical portion 17b in various directions (see FIG. 2).

[Third Embodiment]
6 to 9 show an electric liquid heating and supplying apparatus 10B according to the third embodiment. In addition, description of a basic structure is abbreviate | omitted, and the same component as 1st and 2nd embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  In particular, in this embodiment, the circulating liquid introduction pipe 17B is provided so as to penetrate the side wall 11e of the liquid storage tank 11B and extend horizontally so that the inner end of the pipe is close to the tank wall facing surface (see FIGS. 6 and 7). In the electric heater 13B, the heat generating part 13a is accommodated from the outer end opening of the circulating liquid introducing pipe 17B, and the flange 13c is detachably fixed to the flange 17c at the outer end of the circulating liquid introducing pipe 17B (FIG. 7). reference). In this embodiment, similarly to the second embodiment, a plurality of sets (four sets in the illustrated example) of the circulating liquid introduction pipes 17B and the electric heater 13B are provided, and a heating liquid having a large flow rate can be generated. . The circulation path 15 is connected in communication with the vertical header pipe 15e, and four branch pipes provided in the vertical header pipe 15e are connected in communication with the circulating liquid introduction port 17d of the circulating liquid introduction pipe 17B (see FIGS. 6 and 8). . Also in this embodiment, as in the first embodiment, the side wall 11f of the liquid storage tank 11B is provided with a closing means 18 at a position facing the inner end cylindrical portion 17b of the circulating liquid introduction pipe 17B. Since the circulating liquid introduction pipe 17B is provided horizontally through the side wall 11e, the connection between the flange 13c and the flange 17c is released, and the electric heater 13B is horizontally pulled out to the side of the liquid storage tank 11B (FIG. 9). Similarly to the first embodiment, the inner end cylindrical portion 17b of the circulating liquid introduction pipe 17B is closed by the closing means 18 provided on the side wall 11f, the circulation amount adjusting gate valve 15b is closed, and the drain valves 21a, 21b are closed. Can be removed by allowing the liquid in the circulating liquid introduction pipe 17B to flow.

In this way, even when the circulating liquid introduction pipe 17B is provided horizontally, even if the electric heater 13B is pulled out without removing the entire amount of the heating liquid in the liquid storage tank 11B, the heating in the liquid storage tank 11B from the circulating liquid introduction pipe 17B. Since liquid does not spill out, maintenance can be performed in a short time.
In this embodiment, the circulating liquid introduction pipe 17B is provided in a plurality of stages horizontally so as to overlap vertically when viewed in plan, but may be provided so as to be parallel when viewed in plan.

[Fourth Embodiment]
FIG. 10 shows an electric liquid heating and supplying apparatus 10C according to the fourth embodiment of the present invention. The description of the basic configuration is omitted. In this embodiment, except for the following points, the liquid storage tank 11C is configured substantially the same as the liquid storage tank 11B of the third embodiment.

  A heated liquid take-out pipe 14a is connected to the heated liquid take-out outlet 14, and a heated liquid take-out valve 14c, a heated liquid take-out filter 14d, and a heated liquid take-out pump 14b are sequentially arranged in the middle of the heated liquid take-out pipe 14a. A circulating liquid outlet 15d of the circulation path 15 is branched and connected midway upstream of the heated liquid outlet valve 14c of the heated liquid outlet pipe 14a. That is, the heated liquid outlet pipe 14a also serves as the circulating liquid outlet 15d. In this embodiment, the relative opening adjustment between the heated liquid take-out valve 14c and the circulation amount adjusting gate valve 15b is performed to determine the circulation flow rate and the heated fluid take-out amount.

[Fifth Embodiment]
FIG. 11 shows an electric liquid heating and supplying apparatus 10D according to the fifth embodiment. In addition, description of a basic structure is abbreviate | omitted, and the same component as 1st thru | or 4th embodiment attaches | subjects the same code | symbol, and abbreviate | omits description.

  In this embodiment, a cylinder-shaped liquid storage tank 11D is provided with a circulating liquid introduction pipe 17D horizontally, and an electric heater 13D is provided in the circulating liquid introduction pipe 17D so that it cannot be removed.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and variously modified forms are included in the technical scope without departing from the gist of the invention described in the claims. .

  For example, the shape of the liquid storage tank may be a square shape such as a square or a rectangle or a cylinder, a circle such as an ellipse, a cone, a triangle, or a trapezoid.

  Further, the stock solution to the liquid storage tank may be supplied in the middle of the circulation path 15 via an electromagnetic valve, instead of being supplied by a ball tap. In this case, a float switch is installed so that the solenoid valve is closed when the upper limit switch is ON, and the solenoid valve is opened when the lower limit switch is ON.

10, 10A, 10B, 10C, 10D Electric liquid heating and supply device 11, 11A, 11B, 11C, 11D Liquid storage tank 11a Liquid storage tank body 11b Thermal insulation coating 11c Ceiling wall 11d Temperature detection device 11e, 11f Side wall 12 Stock solution supply Mouth L1 Stock solution L2 Heated liquid 12a Ball tap 13, 13A, 13B, 13D Electric heater 13a Heat generating part 13b Electrode part 13c Flange (heater mounting part)
13d Radiation fin 14 Heated liquid outlet 14a Heated liquid outlet pipe 14b Heated liquid outlet pump 14c Heated liquid outlet valve 14d Heated liquid outlet filter 15 Circulation path 15a Vertical header pipe 15b Gate valve 15c Filter 15d Circulating liquid outlet 15e Horizontal header pipe 16 Circulation pump 17, 17A, 17B, 17C, 17D Circulating liquid introduction pipe 17a Straight pipe part 17b Inner end cylinder part 17c Flange (heater support part)
17d Circulating fluid inlet 18 Blocking means 18a Valve element 18b Shaft 18c Hand-operated handle 18d Support cylinder 19 Base 20 Overflow port 20a, 20b, 20c Drain pipe 21a, 21b Drain valve 21c Drainage tank 22 Partition plate 22a Liquid flow stopper 23 Disturbance Flow plate 30 Power source 31 Power switching means 32 Battery w, w1 Liquid f1 Upflow f2 Meandering flow

Claims (14)

An electric liquid which has a liquid storage tank and an electric heater provided in the liquid storage tank and which is supplied to the liquid storage tank and stored therein is heated by the electric heater and taken out to the outside and used for an appropriate purpose In the heating supply device,
A circulating liquid introduction pipe provided through the tank wall of the liquid storage tank, extending inward and opening an inner end;
A circulation path for taking out the liquid at a position sufficiently away from the inner end of the circulating liquid introduction pipe on the tank wall of the liquid storage tank and returning it to the pipe from the outer end of the circulating liquid introduction pipe, and an intervening path in the circulation path A circulating pump,
The heating part of the electric heater is inserted into the circulating liquid introduction pipe and is configured to heat the liquid returning to the pipe.
An electrical liquid heating and supplying apparatus characterized by the above. The heating portion of the electric heater has a rod shape and is inserted into the pipe from the outer end opening of the circulating liquid introduction pipe provided in a straight tube shape, and is detachably fixed to the outer end opening.
The electric liquid heating and supplying apparatus according to claim 1. The circulating liquid introduction pipe and the electric heater in which the heating unit is accommodated in the circulating liquid introduction pipe are provided as a single set or a plurality of sets.
The electric liquid heating and supplying apparatus according to claim 1 or 2. When the electric heater is pulled out and removed from the circulating liquid introduction pipe, the liquid in the liquid storage tank flows through the circulating liquid introduction pipe so that it cannot flow out from the opening of the outer end of the circulating liquid introduction pipe. Provided with the circulating liquid introduction pipe and the electric heater,
The electric liquid heating and supplying apparatus according to any one of claims 1 to 3. The circulating liquid introduction pipe is suspended from the ceiling wall of the liquid storage tank, and the electric heater can be pulled out above the liquid storage tank at the outer end of the circulation water introduction pipe. By being fixed so as to be removable, it is configured such that the liquid in the liquid storage tank cannot be discharged to the outside.
The electric liquid heating and supplying apparatus according to claim 4. The circulating liquid introduction pipe extends through the side wall of the liquid storage tank and extends inward, and has appropriate closing means for closing the inner end when the electric heater is pulled out, and the electric heater A configuration in which the liquid in the liquid storage tank cannot be discharged to the outside by being detachably fixed to the outer end of the circulating liquid introduction pipe so that it can be pulled out to the side of the liquid storage tank It is said that
The electric liquid heating and supplying apparatus according to claim 4. The liquid storage tank is formed in a substantially rectangular parallelepiped shape, and includes a meandering flow path meandering in a plan view by a plurality of partition wall provided therein, and the electric heater is provided at one end of the meandering flow path.
7. The electric liquid heating and supplying apparatus according to claim 1, wherein A liquid outlet of the circulation path is provided at an appropriate position near the other end or the other end of the meandering flow path of the tank wall of the liquid storage tank;
7. The electric liquid heating and supplying apparatus according to claim 1, wherein A heating liquid external outlet is provided at an appropriate position near the other end or the other end of the meandering channel on the tank wall of the liquid storage tank,
9. The electric liquid heating and supplying apparatus according to claim 1, wherein Supplying liquid to the liquid storage tank and managing the liquid level is performed by a ball tap.
10. The electric liquid heating and supplying apparatus according to claim 1, wherein It is a configuration comprising a battery for storing electric power at a low power late night power and supplying power to the electric heater and the circulation pump when a low power night time has passed.
11. The electric liquid heating and supplying apparatus according to claim 1, wherein The electric heater and the circulation pump are configured to include power switching means for switching to supply of midnight power during midnight hours when power is cheap, and switching to power from the battery when the midnight hours are over.
The electric liquid heating and supplying apparatus according to claim 11. In an electric liquid heating and supplying method for supplying a liquid to a liquid storage tank, heating the liquid with an electric heater, taking out the heated liquid from the heated liquid external outlet and using it for an appropriate purpose,
Inserting the heat generating portion of the electric heater into a circulating liquid introduction pipe provided through the tank wall of the liquid storage tank and extending into the liquid storage tank and having an inner end opened;
The liquid stored in the liquid storage tank is taken out from one part of the liquid storage tank and returned to the pipe from the outer end portion of the circulating liquid introduction pipe so as to be circulated. It is heated by contacting and flowing to the heat generating part, and returned to the liquid storage tank.
An electric liquid heating supply method characterized by the above. It has a circulating liquid introduction pipe and an electric heater,
The circulating liquid introduction pipe includes a straight pipe part that accommodates the electrode part of the electric heater, a heater support part provided at an outer end of the straight pipe part, and a circulation provided at an outer end part of the straight pipe part. A liquid introduction port, and the straight pipe portion is a tank of the liquid storage tank when assembled to a liquid storage tank for constituting the electric liquid heating and supplying device according to any one of claims 1 to 12. It is a configuration in which the penetration part is fixed by welding or through a flange while maintaining the state of penetrating the wall and mostly extending deeply into the tank,
The electric heater includes a rod-shaped heating part housed in the straight pipe part, an electrode part provided at the base end of the heating part, and closer to the heating part than the electrode part at the base end part of the heating part An electric heater mounting portion provided and fixedly coupled to the heater support portion,
A heater assembly characterized by that.

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