JP2011115094A - Externally mounted temperature controller for water tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily suppress abnormal elevation of water temperature in a passage 24 when the amount of water flowing in the passage 24 is reduced. <P>SOLUTION: A second control part 54 compares a water temperature detected by a first temperature sensor 43 arranged on the passage 24 at an influx port 30 side of a heater 38 with a water temperature detected by a second temperature sensor 51 arranged on the passage 24 at an exhaust port 32 side of the heater 38, an amount of water flowing in the passage 24 is reduced by clogging of filter medium, malfunction of pump, etc., and the temperature of water flowing at the exhaust port 32 side of the heater 38 rises than a normal time. When difference in water temperature between the first and second temperature sensors 43 and 51 becomes a prescribed value or above, the second control part 54 reduces the calorific value of the heater 38. As a result, abnormal elevation of temperature of water flowing in the passage 24 is easily suppressed and failure of another instrument and accidental heating of an empty bathtub are suppressed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

    The present invention relates to a water tank external temperature control device that controls the temperature of water in a water tank with a device externally attached to the water tank.

    Conventionally, as an external temperature control device for an aquarium in which a heating body that controls the temperature of the aquarium water is installed outside the aquarium so as not to touch the eyes in order to improve the scenery in the aquarium, for example, the following patents Those described in Document 1 are known.

Japanese Utility Model Publication No. 7-24046

  In this case, a passage through which water flows is formed, a case in which an inlet and an outlet communicating with the passage are formed, and the water that is installed in the passage and generates heat to heat the water flowing through the passage. A heating body, a temperature sensor that is installed in a passage closer to the inlet than the heating body, detects a water temperature at the installation position, and a control unit that controls heat generation of the heating body based on the water temperature detected by the temperature sensor. The water in the aquarium is supplied to the passage from the inlet, while the water in the passage whose temperature is controlled by the heating element is returned from the outlet to the aquarium, so that the temperature of the water in the aquarium is controlled. It is.

    However, in such a conventional external temperature controller for an aquarium, the filter medium installed on the aquarium side (upstream side) from the heating element is clogged, the pump malfunctions, the pipe connecting the aquarium and the case The flow rate of water flowing through the passage may decrease due to detachment or clogging, but even in such a case, if the water temperature at the temperature sensor position is lower than the set temperature, the heating element continues to generate heat. There was a problem that the temperature of the flowing water after heating abnormally increased, resulting in failure of other equipment, or in some cases a situation close to emptying.

  An object of the present invention is to provide an external temperature controller for an aquarium that can easily suppress an abnormal increase in water temperature in the passage when the amount of water flowing through the passage decreases for various reasons.

    The purpose of this is to form a passage through which water flows, a case in which an inlet and an outlet communicating with the passage are formed, and water that is installed in the passage and generates heat to flow through the passage. A heating body to be heated, a first temperature sensor that is installed in a passage on the inlet side of the heating body, and detects a water temperature at the installation position, and the heating body generates heat based on the water temperature detected by the first temperature sensor. In a state where the first control unit to be controlled, the second temperature sensor that is installed in the passage on the outlet side from the heating body and detects the water temperature at the installation position, and the water flowing through the passage by the heating body is heated A water temperature detected by the first temperature sensor and a water temperature detected by the second temperature sensor, and when the difference is equal to or greater than a predetermined value, a second controller that reduces the amount of heat generated by the heating element; water Can be achieved by controlling the temperature of the water in the aquarium by supplying the water in the passage from the inlet to the passage while returning the water in the passage whose temperature is controlled by the heating element from the outlet to the aquarium. it can.

  In this invention, the water temperature detected by the first temperature sensor installed in the passage on the inlet side from the heating body and the water temperature detected by the second temperature sensor installed in the passage on the outlet side from the heating body are the first. Although the two control units are comparing, the amount of water flowing through the passage decreases due to clogging of the filter medium, pump malfunction, etc., and the temperature of the water flowing through the discharge port from the heating body rises from the normal time. When the detected water temperature difference between the two temperature sensors becomes equal to or greater than a predetermined value, the second control unit reduces the amount of heat generated by the heating element. As a result, an abnormal increase in the temperature of the water flowing through the passage can be easily suppressed, and failure of other equipment and emptying can be suppressed.

  Here, as described above, when the detected water temperature difference becomes equal to or greater than a predetermined value, it is conceivable to stop the heating of the heating body. Gets worse rapidly. However, in the present invention, as described above, this is dealt with by reducing the calorific value of the heating body, so that a certain amount of heating is continuously performed on the water, and a good breeding environment can be left.

  Moreover, if comprised as described in Claim 2, even when the flow of the water in a channel | path stops, the whole heating body can be always immersed in water, and this avoids empty cooking reliably. can do.

It is the front view in which a part which shows Embodiment 1 of this invention was fractured | ruptured. It is the front view by which a part of temperature control device was fractured | ruptured. It is a control circuit diagram of a heating body. It is front sectional drawing which shows Embodiment 2 of this invention. It is a control circuit diagram of a heating body. It is a control circuit diagram of the heating body which shows Embodiment 3 of this invention. It is front sectional drawing which shows Embodiment 4 of this invention.

Embodiment 1 of the present invention will be described below with reference to the drawings.
1, 2, and 3, reference numeral 11 denotes a water tank for breeding ornamental fish, crustaceans and the like, and a predetermined amount of water W is stored inside the water tank 11. Reference numeral 12 denotes a mounting table, on which the water tank 11 is mounted. Reference numeral 13 denotes a filtration unit supported on the bottom wall of the mounting table 12. One end (lower end) of a suction pipe 14 extending in the vertical direction is connected to the filtration unit 13, and the suction pipe 14 is connected to the top of the mounting table 12. The wall and the bottom wall of the water tank 11 pass through and extend into the water tank 11. A suction port 15 that is open in the water W of the water tank 11 is attached to the other end (upper end) of the suction pipe 14.

  The filtration unit 13 has a built-in filter material 18 made of a wool mat, a lock mat, etc. The filter material 18 removes dust, dirt, etc. from the water W sucked into the filtration unit 13 from the water tank 11 to remove water. Filter W. The filtration unit 13 includes a pump 20 that discharges and supplies the water W after being filtered by the filter medium 18 to a connection pipe 19 connected to the filtration unit 13.

  23 is a water tank external temperature control device supported on the bottom wall of the mounting table 12 on one side of the filtration unit 13, and this temperature control device 23 has a case main body 25 constituting a part of the case 22. In the case body 25, a storage chamber 25a that forms part of the passage 24 through which the water W flows is formed. The case body 25 has a substantially cylindrical shape with both ends closed, and a plurality of legs 26 are provided on the outer periphery so as not to roll on the mounting table 12. Reference numeral 27 denotes a horizontal inflow pipe that extends in the radial direction and is attached to the peripheral wall of the case main body 25. The base end (inner end in the radial direction) of the inflow pipe 27 is formed on the other side wall of the case main body 25, and the storage chamber 25a. Is connected to a communication path 28 communicating with the.

  Further, the connecting pipe 19 is connected to the inflow pipe 27, and as a result, the front end of the inflow pipe 27 becomes the inflow port 30 of the case 22 communicating with the passage 24. When the water W in the water tank 11 passes through the filtration unit 13 and then is supplied from the inlet 30 into the storage chamber 25a (passage 24), the water W passes through the storage chamber 25a (passage 24) to the other side. Can flow from one side to the other. 31 is a hollow discharge pipe, the discharge pipe 31 is composed of a horizontal horizontal portion 31a extending in the axial direction and a vertical portion 31b as a weir extending upward from the other end of the horizontal portion 31a, The horizontal portion 31a is fixed to one side wall of the case body 25 in a state where one end thereof protrudes toward one side. The case body 25 and the inflow and discharge pipes 27 and 31 described above constitute the case 22 as a whole, and the storage chamber 25a, the hollow holes of the inflow and discharge pipes 27 and 31 and the communication passage 28 as a whole Constitutes the passage 24 through which the water flows. As a result, one end of the discharge pipe 31 (horizontal portion 31 a) becomes the discharge port 32 of the case 22 communicating with the passage 24.

  35 is a substantially L-shaped recirculation pipe. The other end of the horizontal portion 35a of the recirculation pipe 35 is connected to one end of a horizontal portion 31a projecting from the case body 25 to one side. The vertical portion 35 b extends into the water tank 11 through the top wall of the mounting table 12 and the bottom wall of the water tank 11. As a result, the water W that has passed through the passage 24 is discharged from the discharge port 32 to the recirculation pipe 35 and then returned to the water tank 11 through the recirculation pipe 35. For this reason, the water W in the water tank 11 can circulate through the suction pipe 14, the filtration unit 13, the connection pipe 19, the passage 24 of the temperature control device 23 and the reflux pipe 35 one after another.

  Reference numeral 38 denotes a plurality of (herein, three) heaters whose base end portions (other end portions) are supported by the other side wall of the case body 25, and these heaters 38 are disposed in the storage chamber 25a (passage 24). It extends in the axial direction toward one side. Here, each heater 38 is generally composed of a heating wire such as an iron-chromium wire that generates heat when energized, a ceramic tube for hermetically storing the heating wire, and insulating sand filled in the ceramic tube.

  Reference numeral 39 denotes a plug. One end of a pair of power cords 40 is connected to the plug 39, and the three heaters 38a, 38b, and 38c are connected in parallel to the other end of the power cords 40. As described above, the three heaters 38 are installed in the passage 24. When the heaters 38 are energized, the heating wires of the heaters 38 generate heat and heat the water W flowing through the passages 24.

  43 is a first temperature sensor such as a thermistor installed on the other side wall of the case body 25 so as to be exposed to the passage 24 on the inlet 30 side (upstream side) from the heater 38, here the communication passage 28. The first temperature sensor 43 detects the temperature of the water W at the installation position, that is, the temperature of the water W in the passage 24 (in the communication passage 28) before being heated by the heater 38, and the detection result is obtained from an IC, CPU or the like. To the first controller 44 and the second controller 50 described later.

  Here, when the temperature of the water W detected by the first temperature sensor 43 is lower than the set temperature, the first controller 44 controls energization including a thyristor, a triac or the like interposed in the middle of the power cord 40. An energization signal is output to the body 45 to energize the heater 38. On the other hand, when the temperature of the water W is equal to or higher than the set temperature, an energization control body 45 is output to interrupt the energization to the heater 38.

  Thus, water W is supplied into the passage 24 from the water tank 11 through the inflow port 30, while the water W in the passage 24 whose temperature is controlled by the heater 38 is returned from the discharge port 32 to the water tank 11. The temperature of the water W in the water tank 11 is controlled near the set temperature. Thereby, an environment suitable for breeding ornamental fish and the like is provided.

  At this time, the temperature of the water W detected by the first temperature sensor 43 is the temperature of the water W after passing through the suction pipe 14, the filtration unit 13, and the connecting pipe 19. Although it is slightly lower, the first controller 44 corrects such a temperature decrease. The above-described first controller 44 and energization controller 45 as a whole control the heat generation of the heater 38 based on the water temperature detected by the first temperature sensor 43 (controls whether the heater 38 generates heat). The control unit 46 is configured.

  49a, 49b, and 49c are relays respectively interposed in the power cord 40 branched into three. These relays 49a, 49b, and 49c are turned on / off by the control of the second controller 50, and the corresponding heaters 38a, Energization or de-energization is performed on 38b and 38c. Reference numeral 51 denotes a second temperature sensor made of, for example, a thermistor. The second temperature sensor 51 is installed on the horizontal portion 31a of the discharge pipe 31 located on the other side of the side wall of the case body 25. The second temperature sensor 51 is disposed in the passage 24 on the discharge port 32 side (downstream side) from the heater 38. The second temperature sensor 51 detects the temperature of the water W at the installation position, that is, the temperature of the water W in the passage 24 (in the discharge pipe 31) after being heated by the heater 38, and the detection result is the first value. 2 Output to controller 50.

  Here, in the state where the water W flowing through the passage 24 is heated by the heat generated by the heater 38, the filter medium 18 is clogged, the pump 20 is malfunctioning, the suction pipe 14, the connecting pipe 19 is disconnected, clogged, and the circulating pipe 35 is clogged. If the flow rate of the water W flowing through the passage 24 is reduced from the rated flow rate by the pump 20 due to the above, the temperature of the water W after heating may be abnormally increased, leading to the failure of other equipment. In this embodiment, The water temperature of the water W detected by the first temperature sensor 43 and the water temperature of the water W detected by the second temperature sensor 51 are compared by the second controller 50, and the water temperature difference becomes a predetermined value or more. Sometimes, even if the water temperature of the water W in the water tank 11 has dropped below the set temperature, the second controller 50 turns off one of the relays 49 to cut off the energization of the corresponding heater 38, Calorific value of the whole coater 38 so that to lower the (power consumption).

  As a whole, the relay 49 and the second controller 50 described above are the water temperature detected by the first temperature sensor 43 and the water temperature detected by the second temperature sensor 51 when the water flowing through the passage 24 is heated by the heater 38. When the difference is equal to or greater than a predetermined value, the second control unit 54 is configured to reduce the amount of heat generated by the heater 38. Thereby, the abnormal rise of the temperature of the water W flowing through the passage 24 can be easily suppressed, and the failure or emptying of other equipment can be easily suppressed.

  In addition, as described above, when the water temperature difference before and after the heater 38 becomes a predetermined value or more, it is possible to immediately stop energization to the entire heater 38 and stop the heat generation. The temperature of 11 water W falls early and breeding environment deteriorates rapidly. However, in this embodiment, as described above, since the heat generation amount of the heater 38 is reduced, the water W is continuously heated to some extent, and the water tank 11 has a good breeding environment. Can leave.

  When the flow rate of the water W in the passage 24 further decreases, the detected water temperature difference by the first and second temperature sensors 43 and 51 increases. At this time, the second controller 50 follows the increase in the water temperature difference and relays it. 49 is turned off one after another and the energization to the heater 38 is decreased one by one, that is, the number of energized heaters 38 is gradually decreased, and the heat generation amount of the entire heater 38 is gradually decreased by the second control unit 54. It is preferable. The reason for this is that if the heat generation amount of the heater 38 is gradually decreased following the increase in the detected water temperature difference by the first and second temperature sensors 43 and 51 as described above, the flow rate decreases. This is because the temperature of the water W in the water tank 11 can be prevented from abruptly decreasing by heating the water to such an extent that the heater 38 does not cause a problem.

  The entire upper end of the vertical portion (weir) 31b of the discharge pipe 31 is located above the upper ends of all the heaters 38. As a result, the water W flowing into the discharge pipe 31 from the upper end of the vertical portion 31b. The water surface is always located above the upper end of the vertical portion 31b. In this embodiment, the entire space of the passage 24 is normally filled with water W and no air is present. Thereby, even when the flow of the water W in the passage 24 is stopped, the entire heater 38 can be always immersed in the water, and thereby, it is possible to reliably avoid empty cooking.

  56 is a thermal protector made of bimetal or the like interposed in the middle of the power cord 40. The thermal protector 56 is provided in the case body 25 at a position surrounding the central portion in the longitudinal direction of the heater 38. The thermal protector 56 operates when the temperature of the thermal protector 56 itself exceeds, for example, 70 degrees C due to abnormal decrease in flow rate, stop of flow, mixing of bubbles, generation of water vapor, etc. The power supply to is cut off, and double safety is aimed at against an abnormal rise in water temperature.

Next, the operation of the first embodiment will be described.
When the temperature of the water W in the water tank 11 is controlled near the set temperature using the external temperature controller 23 as described above, the temperature of the water W flowing through the passage 24 is detected by the first temperature sensor 43. When the detected temperature is lower than the set temperature (corrected), an energization signal is output from the first controller 44 to the energization control body 45 to energize the heater 38 and cause the heater 38 to generate heat. As a result, the water W in the water tank 11 is heated and the temperature rises. However, when the temperature of the water W rises to a set temperature or higher, the first controller 44 outputs a cutoff signal to the energization controller 45 to the heater 38. Turn off the power. In this way, the temperature of the water W in the water tank 11 is normally controlled near the set temperature.

  Here, the temperature of the water W in the water tank 11 described above is normally controlled within a range of ± 1 ° C. However, the amount of heat generated by the heater 38 is larger than the amount of water W stored in the water tank 11. If the temperature of the water W is too high or the outside air temperature is drastically lowered, the temperature of the water W may change beyond the temperature range of ± 1 ° C. In such a case, the second controller 50 is manually operated to switch off one of the relays 49 to reduce the number of heaters 38 that generate heat, or to turn on the relay 49 that was off. The number of heaters 38 capable of generating heat by switching is increased so that the water W falls within the temperature range.

  For example, after the cleaning of the water tank 11 is completed, while the water W in the low temperature water tank 11 is heated to the set temperature, the amount of heat generated by the entire heater 38 should be a large value (all the heaters 38a, 38b, 38c should be replaced). However, when the temperature is controlled in the vicinity of the set temperature thereafter, the amount of heat generated is too large, and the temperature of the water W may exceed the temperature range. In such a case, as described above, if any heater 38, for example, the heater 38c is disconnected from the circuit and the water W is heated by the two heaters 38a and 38b, the overshoot can be effectively suppressed. it can.

  Next, when the flow rate of the water W flowing through the passage 24 decreases due to clogging of the filter medium 18, malfunction of the pump 20, etc., and the water temperature difference detected by the first and second temperature sensors 43 and 51 becomes a predetermined value or more, The second controller 50 switches off one of the relays 49 to disconnect one of the heaters 38 from the circuit, thereby reducing the heat generation (power consumption) of the entire heater 38 and the temperature of the water W flowing through the passage 24. The abnormal rise of the equipment is suppressed, and the malfunction and the emptying of other equipment are suppressed.

  Next, when the clogging of the filter medium 18 is further deteriorated, the flow rate of the water W in the passage 24 is decreased, and the detected water temperature difference by the first and second temperature sensors 43 and 51 is increased. 2 The number of heaters 38 that can be energized by the controller 50 is gradually reduced, thereby gradually reducing the amount of heat generated by the entire heater 38. When the detected temperature difference exceeds the set value, all the relays 49 are switched off to cut off the energization of all the heaters 38, thereby stopping the heat generation in the heaters 38.

    4 and 5 are views showing Embodiment 2 of the present invention. In this embodiment, the filtration device 110 is installed on the upper surface of the water tank 11, but the external temperature control device 111 is built in the filtration device 110. Here, the filtration device 110 has a box-shaped housing 114 provided with a lid 113 that can be opened and closed. A vertical partition wall 115 extending in the vertical direction on one side of the housing 114 and having both side ends and a lower end fixed to the housing 114 is disposed on the other side, and is higher in the vertical direction on the other side than the vertical partition wall 115. A vertical partition wall 116 that extends and whose both ends and lower ends are fixed to the housing 114 is provided. As a result, a space 117 is defined in the housing 114 between the vertical partition walls 115 and 116.

   Reference numeral 119 denotes a substantially horizontal horizontal partition wall whose both ends and the other end are fixed to the housing 114 and the vertical partition wall 116, respectively. The horizontal partition wall 119 allows the space 117 to be a filtration chamber 120 above the horizontal partition wall 119. And a lower passage 121. An inflow port 122 having a predetermined width communicating with the passage 121 is formed between one end of the horizontal partition wall 119 and the vertical partition wall 115. In the filter chamber 120, two layers of filter media 123 stacked one above the other are accommodated. The upper filter media 123a is made of a fine wool mat, for example, and the lower filter media 123b is made of, for example, a coarse mesh. It is composed of a lock mat.

  A horizontal distribution rod 126 is installed in the filtration chamber 120 directly above the filter material 123, and a plurality of distribution holes 127 are formed through the bottom wall of the distribution rod 126. As a result, when water W is supplied to the distribution rod 126, the water W is distributed and supplied almost uniformly throughout the filter medium 123 through the distribution holes 127. When the water W is thus supplied to the filter medium 123, the water W is filtered by removing dust, dirt, etc. by the filter medium 123a, 123b, and then flows into one end of the passage 121 through the inlet 122. .

   130 is a pump attached to the housing 114 on one side of the vertical partition wall 115, 132 has a water intake 131 opened at the lower end in the water W of the water tank 11, and the upper end is one end of the distribution rod 126. It is a pumping pipe 132 that is open directly above the section. When the pump 130 is operated, the water W in the water tank 11 is sucked through the pumping pipe 132 and continuously supplied to the distribution pipe 126.

   133 is a recirculating pipe that is fixed to the bottom wall of the housing 114 and extends in the vertical direction. The upper end of the recirculating pipe 133 communicates with the other end of the passage 121, and the lower end is below the surface of the water W in the water tank 11. It is open at. As a result, the water W in the passage 121 is returned to the water tank 11 through the circulation pipe 133 from the discharge port 134 formed at the connection portion between the housing 114 and the circulation pipe 133 and communicating with the passage 121. The bottom wall of the housing 114, the vertical partition walls 115 and 116, and the horizontal partition wall 119 as a whole are formed with a passage 121 through which water W flows, and an inlet 122 and a discharge port 134 communicating with the passage 121. The case 135 is formed.

  When the pump 130 is activated, the water W in the water tank 11 is sucked from the water intake 131 and then passes through the filter material 123 to remove dust, dirt, etc., and then filtered. The water W flows into the passage 121 through the inflow port 122 and then flows from the one side to the other side in the passage 121 toward the discharge port 134. After that, the water W is discharged from the discharge port 134 to the recirculation pipe 133 to be in the water tank 11. It is returned to and circulates. Here, the filtering device 110 may be installed on the back side of the water tank, or may be installed between the bottom wall of the water tank and the sand.

  In the above-described embodiment, a wet type filter medium made of a wool mat or a lock mat is used as the filter medium 123. However, in the present invention, another wet type filter medium such as activated carbon or cocoon is used. Alternatively, a dry type filter medium such as a dry ball may be used. In the above-described embodiment, the water W in the water tank 11 is sucked up by the pump 130 installed above the water tank 11 and supplied to the filtration chamber 120 and the passage 121. However, in the present invention, the pumping pipe It is also possible to install a submersible pump at the lower end of the water pump, suck the water W in the water tank by operating the pump, and supply it to the filtration chamber and the passage.

   Reference numeral 137 denotes a mounting block as a weir fixed to the bottom wall of the case 135 (housing 114). At least one, two in this case, one side of the mounting block 137 has the same configuration as the heater 38. A base end portion (the other end portion) of the heater 138 as a heating body is supported. Reference numeral 139 denotes a plug. One end of a pair of power cords 140 is connected to the plug 139, and the two heaters 138 are connected in parallel to the other end of the power cords 140.

  Thus, the heater 138 is installed in the passage 121. When the heater 138 is energized, the heating wire of the heater 138 generates heat and heats the water W flowing through the passage 121. As a result, the water tank The water W in 11 is heated. Reference numeral 141 denotes a relay. The relay 141 can be turned on / off under the control of a second control unit 153, which will be described later, so that one heater 138a can be energized or interrupted.

   Reference numeral 143 denotes a first temperature sensor installed on the bottom wall of the case 135 so as to be exposed to the passage 121 on the inlet 122 (upstream side) side of the heater 138. The first temperature sensor 143 is water in the passage 121 at the installation position. The temperature of W, that is, the temperature of water W before being heated by the heater 138 is detected, and the detection result is output to a controller 144 such as an IC or CPU. At this time, the controller 144 outputs a signal to an energization control body 145 interposed in the middle of the power cord 140 to control the heater 138 in the same manner as the first controller 44.

  The controller 144 and the energization controller 145 described above constitute a first control unit 146 that controls energization of the heater 138 based on the water temperature detected by the first temperature sensor 143, and the first control unit 146 is a housing. The control unit 147 is installed in the housing 114 between the other side wall 114 and the vertical partition wall 116. Reference numeral 152 denotes a second temperature sensor installed so as to be exposed to the passage 121 on the discharge port 134 side (downstream side) from the heater 138, and the second temperature sensor 152 is attached to the upper end portion of the mounting block 137. The second temperature sensor 152 detects the water temperature of the water W in the passage 121 at the installation position, here the water temperature of the water W heated by the heater 138, and outputs the detection result to the controller 144.

  When the detection result (water temperature) is output from the second temperature sensor 152 to the controller 144 in this way, the controller 144 compares the detection result (water temperature) from the first temperature sensor 143 and based on the comparison result. The energization control body 145 is controlled, and the heat generation amount of the heater 138 is controlled. The controller 144 and the energization control body 145 described above constitute a second control unit 153 that changes (decreases) the amount of heat generated by the heater 138 based on the detection result from the second temperature sensor 152 as a whole. The second control unit 153 and the first control unit 146 are shared.

  Here, when the flow rate of the water W flowing through the passage 121 decreases due to clogging of the filter medium 123 and the water temperature difference of the water W detected by the first and second temperature sensors 143 and 152 becomes a predetermined value or more, the controller 144 Controls the energization control body 145, thereby shortening the energization time in one wavelength of AC electricity flowing through the power cord 140 and reducing the heat generation amount (power consumption) of the entire heater 138. Thereby, the abnormal rise of the temperature of the water W flowing through the passage 121 can be easily suppressed, and the failure and emptying of other devices can be easily suppressed. When the water temperature difference becomes equal to or greater than a predetermined value, the controller 144 switches off the relay 141 to cut off the energization of the heater 138a, thereby reducing the amount of heat generated by the heater 138 as a whole.

  When the flow rate of the water W in the passage 121 gradually decreases and the detected water temperature difference by the first and second temperature sensors 143 and 152 gradually increases from a predetermined value, the power cord 140 is connected for the same reason as described above. It is preferable to gradually decrease the energization time in one wavelength of the flowing AC electricity, thereby gradually decreasing the heat generation amount of the heater 138. At this time, if the value obtained by dividing the reduction amount (%) of the flow rate by the reduction amount (%) of the calorific value is within the range of 0.85 to 1.15, the temperature increase of the water W in the passage 121 is restricted and the water tank 11 Since the temperature fall of the water W in can be effectively suppressed, it is preferable.

  Further, when the detected water temperature difference by the first and second temperature sensors 143 and 152 becomes a set value or more, the energization time in one wavelength is set to zero, that is, the energization to the heater 138 is cut off. It is preferable to stop the heat generation in the heater 138. Further, in this embodiment, the entire upper end of the mounting block (weir) 137 provided in the passage 121 on the discharge port 134 side from the heater 138 is positioned above the upper ends of all the heaters 138. The surface of the water W passing through the passage 121 above 137 is always located above the heater 138, so that even when the flow of the water W in the passage 121 stops, the entire heater 138 is always submerged. Can be immersed in.

   Reference numeral 154 denotes a thermal protector interposed in the middle of the power cord 140, and the thermal protector 154 is provided in a case 135 at a position surrounding the central portion in the longitudinal direction of the heater 138. The thermal protector 154 operates when the temperature of the thermal protector 154 exceeds, for example, 70 ° C., shuts off the power supply to the heater 138, and doubles the safety against an abnormal increase in water temperature.

Next, the operation of the second embodiment will be described.
When the external temperature controller 111 of this embodiment is used to control the water W in the water tank 11 to the set temperature, it is performed in the same manner as in the first embodiment. Here, the temperature of the water W in the water tank 11 may change beyond the temperature range of ± 1 ° C. In such a case, the second control unit 153 switches the relay 141 to change the heater. 138a may be disconnected from the circuit, restored, or the second control unit 153 may increase or decrease the energization time in one wavelength of AC electricity so that the water W falls within the temperature range.

  Next, for example, when the filter medium 123 is clogged slightly, the flow rate of the water W flowing through the passage 121 is slightly reduced, but since the heat generation amount of the heater 138 is not changed, the water W is slightly increased by the heater 138 from the rated flow rate. Heated to high temperature. As a result, the temperature of the water W between the heater 138 and the lower end opening of the reflux pipe 133 becomes slightly high, and thereby the amount of heat released from the water W while flowing from the position of the heater 138 to the lower end opening of the reflux pipe 133. However, it can be more in some cases.

  In such a case, the amount of heat per unit time supplied to the water W in the water tank 11 by the water W flowing into the water tank 11 through the passage 121 decreases, and the temperature of the water W in the water tank 11 decreases. The control unit 153 may increase the energization time in one wavelength of AC electricity, and thereby increase the amount of heat generated from the heater 138 slightly, so that it may be dealt with.

  Further, when the flow rate of the water W flowing through the passage 121 decreases and the detected water temperature difference by the first and second temperature sensors 143 and 152 becomes a predetermined value or more, the second control unit 153 causes the AC electric current in one wavelength. The energization time is reduced, thereby reducing the heat generation amount (power consumption) of the heater 138 as a whole. Further, when the flow rate in the passage 121 further decreases and the detected water temperature difference by the first and second temperature sensors 143 and 152 exceeds the set value, the energization time in one wavelength is zero, that is, the heater 138 is energized. This stops the heat generation in the heater 138.

    FIG. 6 is a diagram showing Embodiment 3 of the present invention. In this embodiment, the second control unit 155 is provided separately from the first control unit 146, and the second control unit 155 is provided with a transformer with a tap changer at the time of loading, which is interposed in the middle of the power cord 140. 156 and the detected water temperatures from the first and second temperature sensors 143 and 152 to obtain a difference between these water temperatures and control a relay or the like (not shown) based on the water temperature difference. The controller 158 includes an IC, a CPU, and the like for switching the tap 157 in 156.

  In this embodiment, when the tap 157 installed in the transformer 156 is switched by the controller 158, the voltage flowing through the heater 138 changes, thereby changing the power consumption of the heater 138 and the entire heater 138. The amount of heat generated at In addition, when the second control unit 155 is provided separately from the first control unit 146 as in this embodiment, the controller 144 constituting the first control unit 146 may be configured by a control circuit including a comparator. . Other configurations and operations are the same as those of the second embodiment.

    FIG. 7 is a diagram showing Embodiment 4 of the present invention. In this embodiment, the water tank external temperature controller 161 is supported on the bottom wall of the mounting table 12. Here, the temperature control device 161 has a case body 163 in which a storage chamber 162 is formed. The case body 163 is made of an insulating material such as plastic and has a bottomed cylindrical shape. In addition, a lid 165 is detachably attached to the upper end of the case body 163. As a result, the upper end opening of the case body 163 is closed by the lid 165. The storage chamber 162 stores a plurality of types, in this case, four types of filter media 164, and these filter media 164 are sequentially arranged from the lower side to the upper side, for example, ceramic ring-shaped filter media, coarse filters. It is composed of a pad, a biological filter material using bacteria, and an adsorbent filter material using activated carbon.

   167 is an inflow pipe that extends in the vertical direction and is inserted into the case main body 163 in contact with the inner peripheral surface of the case main body 163. The upper end of the inflow pipe 167 protrudes upward from the lid 165, while The lower end is located slightly above the upper surface of the bottom wall of the case body 163. One end of a suction pipe 14 similar to that of the first embodiment is connected to the upper end of the inflow pipe 167. In this embodiment, a pump 168 that sucks the water W of the water tank 11 and supplies it to the inflow pipe 167 and the storage chamber 162 is interposed in the middle of the suction pipe 14. As a result, the upper end opening of the inflow pipe 167 becomes the inlet 170 of the passage 169 including the storage chamber 162.

  Then, when the water W in the water tank 11 passes through the inflow pipe 167 and then is supplied into the storage chamber 162, the water W passes through the filter medium 164 stored in the storage chamber 162 (passage 169) from below to above. Then, it is passed through and filtered by the filter medium 164. A discharge pipe 173 is fixed to the lid 165 and extends in the vertical direction. The lower end of the discharge pipe 173 passes through the lid 165 and communicates with the storage chamber 162. The case body 163, the lid 165, the inflow pipe 167, and the discharge pipe 173 described above constitute the case 174 as a whole, and the hollow holes of the storage chamber 162, the inflow and discharge pipes 167, 173 as a whole flow water W. The passage 169 is configured.

  As a result, the upper end opening of the discharge pipe 173 becomes the discharge port 175 of the passage 169. The upper end of the discharge pipe 173 is connected to the reflux pipe 35 similar to that of the first embodiment, whereby the water W that has passed through the passage 169 is discharged from the discharge port 175 to the reflux pipe 35, and then The water is returned to the water tank 11 through the reflux pipe 35. For this reason, the water W in the water tank 11 can circulate through the suction pipe 14, the passage 169, and the circulating pipe 35 one after another.

   Reference numeral 178 denotes a heating plate as a plate-like heating body installed in the passage 169 (case 174). The heating plate 178 is made of a metal (conductive material) such as stainless steel, and the bottom of the passage 169 Here, a spacer is interposed between the bottom surface (the bottom wall of the case body 163) and a gap is formed between them, and the bottom wall of the case body 163 is melted by the heat generated by the heating plate 178. Is preventing. Further, a slight gap is provided between the heating plate 178 and the filter medium 164 in order to stabilize the flow of water W, temperature distribution, and the like. Reference numeral 179 denotes a support table installed on the bottom wall of the mounting table 12, and the case 174 is mounted on the support table 179. An electromagnetic induction coil 180 is built in the support base 179. As a result, the electromagnetic induction coil 180 is separated from the case 174 and disposed immediately below the heating plate 178.

  When a high frequency current is supplied to the electromagnetic induction coil 180, an eddy current flows through the heating plate 178 due to an alternating magnetic field generated by the electromagnetic induction coil 180, generating Joule heat, and the heating plate 178 generates heat due to electromagnetic induction. To do. At this time, the heating plate 178 heats the water W passing through the passage 169. 181 is a passage 169 on the inlet 170 side (upstream side) of the heating plate 178, here a first temperature sensor such as a thermistor installed in the inlet pipe 167 so as to be exposed in the hollow hole of the inlet pipe 167, The first temperature sensor 181 detects the temperature of the water W in the passage 169 at the installation position, that is, the temperature of the water W in the passage 169 before being heated by the heating plate 178, and the detection result includes an IC, a CPU, and the like. Output to controller 182.

  Here, when the temperature of the water W detected by the first temperature sensor 181 is lower than a set temperature, the controller 182 supplies a high-frequency current to the electromagnetic induction coil 180, while the temperature of the water W is set. When the temperature is higher than the temperature, the supply of the high-frequency current to the electromagnetic induction coil 180 is stopped. As a result, the temperature of the water W in the water tank 11 is controlled near the set temperature. Reference numeral 185 denotes a second temperature sensor made of, for example, a thermistor, and the second temperature sensor 185 is exposed to the passage 169 on the discharge port 175 side (downstream side) of the heating plate 178, here, the hollow hole of the discharge pipe 173. It is installed in the discharge pipe 173.

  The second temperature sensor 185 detects the temperature of the water W in the passage 169 at the installation position, that is, the temperature of the water W in the passage 169 after being heated by the heating plate 178, and the detection result is sent to the controller 182. Output. At this time, the controller 182 compares the water temperature of the water W detected by the first temperature sensor 181 with the water temperature of the water W detected by the second temperature sensor 185, and the water temperature difference becomes equal to or greater than a predetermined value. At this time, the power value supplied to the electromagnetic induction coil 180 is reduced, and the amount of heat generated by the heating plate 178 is reduced. Thus, in this embodiment, one controller 182 corresponds to the first and second control units in the present invention, and these first and second control units are shared. Note that the control of the amount of heat generated by the heating plate 178 based on the above-described water temperature difference is the same as in the first embodiment, and thus detailed description thereof is omitted.

    In the present invention, four or more heaters are provided, and the number of heaters to be energized is changed by switching relays according to a signal from the controller, thereby controlling the amount of heat generated by the entire heater. Also good. Moreover, in this invention, you may make it control the voltage which flows through a heater using an inverter, and, thereby, the emitted-heat amount of a heater may be controlled. Further, in the present invention, a planar heating element may be used as the heater.

  The present invention can be applied to the industrial field in which the temperature of water in the water tank is controlled by a device externally attached to the water tank.

11 ... Water tank 22 ... Case
24 ... Aisle 30 ... Inlet
31b ... Weir 32 ... Discharge port
38 ... Heating element 43 ... First temperature sensor
46 ... 1st control part 51 ... 2nd temperature sensor
54 ... Second control unit W ... Water

Claims (2)

    A passage in which water flows is formed, a case in which an inlet and an outlet communicating with the passage are formed, a heating body that is installed in the passage and heats the water flowing through the passage by generating heat, A first temperature sensor that is installed in a passage on the inlet side of the heating body and detects a water temperature at the installation position, and a first control unit that controls heat generation of the heating body based on the water temperature detected by the first temperature sensor. And a second temperature sensor that is installed in the passage on the outlet side from the heating body and detects the water temperature at the installation position, and is detected by the first temperature sensor in a state where the water flowing through the passage is heated by the heating body. A water temperature detected by the second temperature sensor and when the difference exceeds a predetermined value, a second control unit is provided for reducing the amount of heat generated by the heating element. Entrance External temperature control for aquarium, characterized in that the temperature of the water in the aquarium is controlled by returning the water in the aisle whose temperature is controlled by a heating element from the discharge port to the aquarium while supplying to the aisle apparatus.     A dam whose upper end region is located above the upper end of the heating body is provided in the passage on the discharge port side of the heating body, and a water surface passing above the weir is positioned above the upper end of the heating body. The external temperature control apparatus for water tanks of 1.

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