JP2007238228A - Water heating device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heating device of an elevator for efficiently heating water by using regenerative power of the elevator. <P>SOLUTION: A regenerative resistor 21 is provided inside a tank 22, and connected to a switching element 20 provided in an elevator driving device. The elevator driving device drives the elevator car 18 by supplying power, which is supplied from a power source 11, to a hoisting machine 16 through a diode bridge circuit 12, a capacitor 13 and an inverter 14. When running power is generated in operation of the elevator, regenerative power thereof is supplied to the regenerative resistor 21 provided inside the tank 22 through the switching element 20. With this structure, the regenerative resistor 21 generates the heat, and water 23 inside the tank 22 is heated by that heat. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hot water device using the rotating power of an elevator.

  In elevators with relatively low power, such as medium and low speeds, a diode bridge is placed on the input side to convert from AC to DC, then converted to AC of any frequency with an inverter, and the hoisting machine is rotated with that power The elevator car is raised and lowered.

  Generally, the elevator car is a slat type with a counterweight disposed on the opposite side via a rope. When the weight of the car rises in a state that is heavier than the counterweight on the opposite side, power is consumed, and conversely, when the weight of the car rises in a light state, power is generated. In this way, the operating state that generates electric power is called “regenerative operation”, and the electric power at that time is called “regenerative power” or “regenerative energy”.

In a conventional elevator drive system, a resistor and a switching element are provided between the DC buses of the power source, and power generated during regenerative operation is passed through the switching element to the resistor and consumed as heat (for example, Patent Document 1).
JP-A-8-143243

  As described above, in the conventional elevator drive system, the electric power generated during the regenerative operation is passed through the resistor and consumed as heat. However, consuming power wastefully is not economical and environmentally undesirable. In this case, there is also a method of converting the regenerative power of the elevator to the same frequency as the power supply side by the converter and returning it to the power company, but the converter is very expensive and requires extensive equipment, Not suitable for general small / medium elevator systems.

  On the other hand, for example, in an office building, a hot water device for supplying hot water to each floor may be installed. This hot water apparatus is generally configured to store the water in the tank by converting the water in the tank into hot water using night electricity with a low electricity bill, and supplying the hot water in the daytime. However, if you use more hot water than you have stored in the daytime, you will have to heat it using power supply to make up for it. was there.

  This invention is made | formed in view of the above points, and it aims at providing the warm water apparatus of an elevator which produces warm water efficiently using the regenerative electric power of an elevator.

  An elevator hot water apparatus according to the present invention includes a tank that stores water, a heating element provided in the tank, a drive device that drives an elevator car by electric power supplied from a power source, and a predetermined number of the drive device. And a switching element that supplies power generated during regenerative operation to the heating element, and is configured to warm water in the tank using regenerative power. To do.

  ADVANTAGE OF THE INVENTION According to this invention, warm water can be produced efficiently by warming the water in a tank using the regenerative electric power of an elevator, and the hot water apparatus excellent also economically and environmentally can be implement | achieved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram schematically showing the configuration of an elevator water heater according to a first embodiment of the present invention.

  As an elevator driving device, a power source (three-phase AC power source) 11, a diode bridge circuit 12, a capacitor 13, and an inverter 14 are provided. The AC voltage supplied from the power supply 11, which is a commercial power supply, is converted into a DC voltage via the diode bridge circuit 12, and then applied to the inverter 14 via the capacitor 13. The capacitor 13 is provided to smooth the DC voltage ripple. Then, in the inverter 14, the control device 15 converts the frequency into an arbitrary frequency and an arbitrary voltage value, and supplies it to the hoisting machine 16 made of an electric motor.

  A counterweight 17 and a car 18 are connected to the hoist 16 in a slidable manner. When the counterweight 17 moves, the car 18 moves up and down in the opposite direction via a rope 19.

  Here, when the direction in which the car 18 is to be moved is opposite to the direction in which the car is pulled due to the difference in weight between the counterweight 17 and the car 18, power is supplied from the power source 11 to drive the hoisting machine 16. To move the car 18. On the other hand, when the direction in which the car 18 is desired to be moved is the same as the direction in which the counterweight 17 and the car 18 are pulled by the difference in weight, a braking force is applied to the hoisting machine 16 and so-called “regenerative power” is generated. .

  In this system, this regenerative power is supplied to the regenerative resistor 21 via the switching element 20 provided between the DC buses of the drive system, so that the water 23 in the tank 22 is heated.

  The tank 22 is provided in a machine room of an elevator, for example. The tank 22 has a capacity capable of storing a predetermined amount of water 23 supplied through a water supply opening / closing valve 24a. In the tank 22, a regenerative resistor 21 connected to the switching element 20 of the elevator drive system is provided as a heater of the water heater. The regenerative resistor 21 generates heat by the regenerative power, so that the water 23 in the tank 22 is replaced with warm water. The warmed water 23, that is, warm water is supplied to the hot water supply port 25 through a water supply opening / closing valve 24 b disposed in the upper part of the tank 22. This hot water supply port 25 is arranged at one or more branches in places where hot water is required, such as hot water supply rooms on each floor.

  The regenerative resistor 21 used as a heater in the tank 22 is preferably installed in the lower part of the tank 22. This is because the water 23 (warm water) warmed in the tank 22 accumulates in the upper part, and if there is a regenerative resistor 21 in the vicinity of the upper part, it is difficult to release the regenerative power.

  Reference numeral 24c denotes a drainage on-off valve. This on-off valve 24c is used when the water 23 in the tank 22 is drained to the outside for some reason, for example, when the temperature of the water 23 in the tank 22 rises abnormally and the regenerative power cannot be consumed. Used.

  In such a configuration, a predetermined volume of water 23 is accumulated in the tank 22 via the on-off valve 24a. On the other hand, in the elevator drive system, the hoisting machine 16 is driven by the electric power supplied from the power supply 11, and the car 18 moves up and down in the hoistway to provide an operation service.

  Here, when the elevator performs a regenerative operation, the control device 15 turns on (opens) the switching element 20 and causes the regenerative power generated at that time to flow through the regenerative resistor 21. Whether or not the elevator is in the regenerative operation is detected, for example, by detecting the voltage between the DC buses, that is, the voltage across the capacitor 13, and determining that the operation is in the regenerative operation when the voltage value exceeds a predetermined value.

  When regenerative power is supplied to the regenerative resistor 21 via the switching element 20, the regenerative resistor 21 generates heat, and the water 23 in the tank 22 is warmed by the heat. The warmed water 23 is stored in the upper part of the tank 22 and is supplied to the hot water supply port 25 as hot water through the on-off valve 24b of the tank 22 in the daytime, for example.

  In this way, by reusing the regenerative electric power of the elevator that has been discarded as heat up to now as the electric power of the water heater, it is possible to greatly reduce the electricity bill and to realize an environmentally superior water heater be able to.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  FIG. 2 is a diagram schematically showing a configuration of an elevator water heater according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the structure of FIG. 1 in the said 1st Embodiment, and the description shall be abbreviate | omitted.

  The difference from the first embodiment is that a second tank 31 is provided separately from the tank 22. A heater 32 dedicated to the water heater is installed in the second tank 31. The heater 32 receives predetermined power from a power source 33 different from the power source 11 and generates heat, and heats the water 35 in the second tank 31 to warm it. The control device 34 is a microcomputer for controlling the heat generation operation of the heater 32.

  Similar to the tank 22, the second tank 31 is provided with an on-off valve 36 a for storing water, an on-off valve 36 b for water supply, and an on-off valve 36 c for draining. The second tank 31 is connected to the same hot water supply port 25 as the tank 22 through a water supply opening / closing valve 36 b and a connecting pipe 32.

  On the other hand, a temperature sensor 38 is installed in the tank 22 that uses the regenerative resistor 21 as a heat source. The temperature sensor 38 is for measuring the water temperature in the tank 22, and is installed on the upper side of the tank 22. The temperature information measured by the temperature sensor 38 is sent to the signal processing device 39. Based on this temperature information, if the water temperature in the tank 22 is equal to or higher than the set temperature, the signal processing device 39 opens the on-off valve 24b of the tank 22 to supply hot water, but if it is lower than the set temperature, the on-off valve 24b Is closed, and instead, the on / off valve 36b for water supply of the second tank 31 is opened, and hot water is supplied therefrom.

  Thus, by providing the 2nd tank 31 which has the heater 32 for water heaters separately from the tank 22, when the water temperature in the tank 22 is less than preset temperature, hot water can be supplied from the tank 31. FIG. In this case, if the water temperature in the tank 22 satisfies the set temperature, the tank 22 is used preferentially. As a result, new water can be appropriately replenished in the tank 22 to suppress an abnormal rise in water temperature, and as a result, the regenerative power generated during operation of the elevator can be efficiently released from the regenerative resistor 21 in the tank 22. it can.

(Third embodiment)
Next, a third embodiment of the present invention will be described.

  FIG. 3 is a diagram schematically showing a configuration of an elevator water heater according to a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the structure of FIG. 1 in the said 1st Embodiment, and the description shall be abbreviate | omitted.

  The difference from the first embodiment is that a heater 41 dedicated to the water heater is provided in the tank 22 separately from the regenerative resistor 21. The heater 41 receives predetermined power from the power source 42 and generates heat, and heats the water 23 in the tank 22 to warm it. The control device 43 is a microcomputer for controlling the heat generation operation of the heater 41.

  Further, a first temperature sensor 44 and a second temperature sensor 45 are provided in the tank 22. The first temperature sensor 44 and the second temperature sensor 45 each measure the water temperature in the tank 22. In this case, the first temperature sensor 44 measures the water temperature at the upper part of the tank 22, and the second temperature sensor 45 measures the water temperature at the lower part of the tank 22, and gives the temperature information to the control device 43.

  Here, when the controller 43 confirms that the water temperature in the upper part of the tank 22 is equal to or lower than the set temperature based on the temperature information from the first temperature sensor 44, the controller 43 supplies the required power to the heater 41 and drives it. As a result, the water 23 in the tank 22 is heated and adjusted to raise the water temperature. On the other hand, if the water temperature in the upper part of the tank 22 is higher than the set temperature, the heater 41 is stopped. Thereby, the water 23 in the tank 22 is heated using only the electric power generated during the regenerative operation.

  However, when the heater 41 dedicated to the water heater is used in combination, the water temperature in the tank 22 rises more than expected, and the regenerative power may not be released during the elevator operation. Therefore, the water temperature in the lower part of the tank 22 is measured by the second temperature sensor 45 to monitor whether or not the water 23 in the tank 22 is entirely heated. When the water temperature at the lower part of the tank 22 exceeds the set temperature (the temperature equal to or higher than the set temperature at the upper part of the tank), the controller 43 determines that the temperature of the water 23 in the tank 22 is higher than the upper part of the tank 22. In addition, it is determined that the temperature is increased as a whole, and the on-off valve 24a for water storage and the on-off valve 24c for drainage are controlled to be opened / closed to perform water supply / drainage to adjust the temperature. Thereby, the electric power generated during the regenerative operation can be efficiently released through the regenerative resistor 21 in the tank 22.

  In this way, a heater 41 dedicated to the water heater may be provided in the tank 22 separately from the regenerative resistor 21, and heating may be performed using the heater 41 as appropriate according to the water temperature state in the tank 22. In this case, compared with the structure of the said 2nd Embodiment, since a tank can be comprised by one, it is advantageous in space.

  As a condition for driving the heater 41, a time condition such as nighttime may be added in addition to the temperature condition.

  That is, when the water temperature in the tank 22 measured through the first temperature sensor 44 is equal to or lower than the preset temperature during the night time period set in advance, the heater 41 is driven to drive the water 23 in the tank 22. Heat. Thereby, when the electricity bill at night is cheap, the heater 41 can be used to warm water. In this case, during the daytime, the heater 41 is not used and warming is performed only by the regenerative resistor 21, but the water 23 in the tank 22 is sufficiently warmed to the set temperature at night. It is thought that there is no particular problem.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.

  FIG. 4 is a diagram schematically showing a configuration of an elevator water heater according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the structure of FIG. 1 in the said 1st Embodiment, and the description shall be abbreviate | omitted.

  The difference from the first embodiment is that a control device 51 that controls ON / OFF of the regenerative resistor 21 provided in the tank 22, a first temperature sensor 52 that measures the water temperature in the tank 22, and a second And a temperature sensor 53. The first temperature sensor 52 measures the water temperature at the upper part of the tank 22, the second temperature sensor 53 measures the water temperature at the lower part of the tank 22, and gives the temperature information to the control device 51.

  Here, when the operation of the elevator is stopped, the control device 51 determines that if the water temperature in the upper part of the tank 22 is equal to or lower than the set temperature based on the temperature information from the first temperature sensor 52, the switching element 20. Turn on. Thereby, electric power can be supplied to the regenerative resistor 21 from the power supply 11 of the elevator, and the water temperature in the tank 22 can be raised.

  However, if power is supplied to the regenerative resistor 21 using the power supply 11, the water temperature rises more than expected, and the regenerative power may not be released during the elevator operation. Therefore, the water temperature in the lower part of the tank 22 is measured by the second temperature sensor 53, thereby monitoring whether or not the water 23 in the tank 22 is entirely heated. If the water temperature at the lower part of the tank 22 exceeds a set temperature (a temperature equal to or higher than the set temperature at the upper part of the tank), the controller 51 determines that the temperature of the water 23 in the tank 22 is only at the upper part of the tank. Instead, it is determined that the temperature is increased as a whole, and the on-off valve 24a for water storage and the on-off valve 24c for drainage are controlled to open and close to supply and drain water to adjust the temperature.

  As described above, the regenerative resistor 21 in the tank 22 may be forcibly heated by supplying power to the regenerative resistor 21 in the tank 22 using the elevator power supply 11 according to the water temperature state of the tank 22.

  As in the third embodiment, a time condition such as nighttime may be added as a condition for forced heating in addition to the temperature condition.

  That is, power is supplied to the regenerative resistor 21 using the power supply 11 when the water temperature in the tank 22 measured through the first temperature sensor 52 is equal to or lower than the set temperature during a preset night time period. Then, the water 23 in the tank 22 is heated. Thereby, when the electricity bill at night is cheap, it can be warmed using the power supply 11. In this case, during the daytime, the power generated during the regenerative operation is supplied to the regenerative resistor 21 to warm the water, but the water 23 in the tank 22 is sufficiently warmed to the set temperature at night. Therefore, there is no problem.

  FIG. 5 is a flowchart showing processing corresponding to the fourth embodiment of the present invention.

  First, the control device 51 checks the water temperature at the bottom of the tank through the second temperature sensor 53 provided in the tank 22 (step S11). As a result, when the set temperature is exceeded (Yes in step S12), the control device 51 determines that the water 23 in the tank 22 is entirely heated, and the storage open / close valve 24a and the drainage The on-off valve 24c is controlled to open and close to perform water supply and drainage, and the water temperature is adjusted to be lowered (step S13). In this way, the water temperature is lowered when the water 23 in the tank 22 is entirely heated so that the rotating power generated during the elevator operation can be efficiently released through the regenerative resistor 21 in the tank 22. Because it becomes impossible.

  Moreover, if it is below setting temperature (No of step S12), a process will branch according to the driving | running state of an elevator.

  That is, if there is an elevator operation command (step S14), normal operation control is performed (step S15). Specifically, the hoisting machine 16 is driven and controlled by the control device 15, and the car 18 moves up and down in response to a hall call or a car call. At this time, if it is a regenerative operation (Yes in step S16), the control device 15 turns on (opens) the switching element 20 (step S17), and supplies the electric power generated at that time to the regenerative resistor 21 so that the tank The water 23 in 22 is heated (step S18). Thereby, the water 23 in the tank 22 is warmed by resistance heat, and is supplied to the hot water supply port 25 as hot water through the on-off valve 24 b of the tank 22.

  Whether or not the elevator is in regenerative operation is determined by, for example, detecting the voltage between the DC buses, that is, the voltage across the capacitor 13, and determining that the elevator is in regenerative operation when the voltage value exceeds a predetermined value. Assume that the element 20 is turned on.

  On the other hand, if there is no elevator operation command and the night time power usage time period is set in advance (Yes in step S19), the control device 51 passes through the first temperature sensor 52 provided in the tank 22. The water temperature at the top of the tank is checked (step S20). In this case, the water temperature in the upper part of the tank is checked because the temperature of the water 23 in the tank 22 gradually increases from the upper part (water surface side).

  Here, when the temperature is equal to or lower than the set temperature, that is, when the temperature cannot be supplied as hot water (Yes in Step S21), the control device 51 turns ON (opens) the switching element 20 (Step S21). S17), forced heating is performed by supplying power from the power source 11 to the regenerative resistor 21 (step S18). In this case, the power source 11 is used, but the night power can be cheaper than the daytime. By this forced heating, the water 23 in the tank 22 can be raised to the required temperature at night, and the on-off valve 24b of the tank 22 can be opened in the daytime to supply hot water to the hot water supply port 25.

  In each of the above embodiments, the description has been given assuming a building in which one elevator is installed. However, the present invention is not limited to this, and can be applied even when a plurality of elevators are installed. . In this case, the water in the tank may be warmed by the same method as described above using the rotational power generated individually from the driving devices corresponding to each of the plurality of elevators.

  In addition, although the resistance element (regenerative resistance) is used to heat the water in the tank, any element other than the resistance element can be used as long as it can change the regenerative power of the elevator to heat. May be.

  In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. In addition, various forms can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

FIG. 1 is a diagram schematically showing the configuration of an elevator water heater according to a first embodiment of the present invention. FIG. 2 is a diagram schematically showing a configuration of an elevator water heater according to the second embodiment of the present invention. FIG. 3 is a diagram schematically showing a configuration of an elevator water heater according to a third embodiment of the present invention. FIG. 4 is a diagram schematically showing a configuration of an elevator water heater according to a fourth embodiment of the present invention. FIG. 5 is a flowchart showing processing corresponding to the fourth embodiment of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Power supply, 12 ... Diode bridge circuit, 13 ... Capacitor, 14 ... Inverter, 15 ... Control device, 16 ... Hoisting machine, 17 ... Counterweight, 18 ... Ride car, 19 ... Rope, 20 ... Switching element, 21 ... Regenerative resistance, 22 ... tank, 23 ... water, 24a ... open / close valve for water storage, 24b ... open / close valve for water supply, 24c ... open / close valve for drainage, 25 ... hot water supply port, 31 ... second tank, 32 ... heater , 33 ... power supply, 34 ... control device, 35 ... water, 36a ... open / close valve for water storage, 36b ... open / close valve for water supply, 36c ... open / close valve for drainage, 37 ... connecting pipe, 38 ... temperature sensor, 39 ... Signal processing device, 41 ... heater, 42 ... power supply, 43 ... control device, 51 ... control device, 52 ... first temperature sensor, 53 ... second temperature sensor.

Claims (8)

A tank with water,
A heating element provided in the tank;
A drive device for driving the elevator car with power supplied from a power source;
A switching element that is provided at a predetermined location of the driving device and supplies power generated during regenerative operation to the heating element;
An elevator hot water apparatus configured to warm water in the tank using regenerative electric power. A second tank provided with a heater dedicated to the water heater separately from the tank;
A temperature sensor for measuring the water temperature in the tank;
Hot water is preferentially supplied from the tank when the water temperature in the tank measured by the temperature sensor is equal to or higher than a preset temperature, and hot water is supplied using the second tank if the water temperature in the tank is lower than the preset temperature. The elevator hot water device according to claim 1, further comprising: A heater dedicated to the water heater provided in the tank;
A temperature sensor for measuring the water temperature in the tank;
2. The control device according to claim 1, further comprising a control unit configured to adjust the temperature by driving the heater to raise the water temperature when the water temperature in the tank measured by the temperature sensor is equal to or lower than a set temperature. Elevator water heater. A heater dedicated to the water heater provided in the tank;
A first temperature sensor for measuring the water temperature in the upper part of the tank;
A second temperature sensor for measuring the water temperature in the lower part of the tank;
When the water temperature in the upper part of the tank measured by the first temperature sensor is equal to or lower than a set temperature, the heater is driven to increase the water temperature, and the lower part of the tank in the tank measured by the second temperature sensor is increased. The elevator water heater according to claim 1, further comprising a control means for adjusting the temperature so as to lower the water temperature by supplying and discharging water when the water temperature exceeds a set temperature.   The control means uses a preset time zone as a driving condition, and adjusts the temperature so that the water temperature is raised by driving the heater when the water temperature in the tank falls below a set temperature during the time zone. The hot water apparatus for an elevator according to claim 3 or 4, characterized in that. A temperature sensor for measuring the water temperature in the tank;
Control means for adjusting the temperature so as to increase the water temperature by supplying the power from the power source to the heating element via the switching element when the water temperature in the tank measured by the temperature sensor is equal to or lower than a set temperature; ,
The elevator hot water device according to claim 1, comprising: A first temperature sensor for measuring the water temperature in the upper part of the tank;
A second temperature sensor for measuring the water temperature in the lower part of the tank;
When the water temperature in the upper part of the tank measured by the first temperature sensor is equal to or lower than a preset temperature, the water temperature is raised by supplying power from the power source to the heating element via the switching element, and 2. Control means for adjusting the temperature so as to lower the water temperature by supplying and draining water when the water temperature in the lower part of the tank measured by the temperature sensor of 2 exceeds a set temperature is provided. Elevator water heater.   The control means uses a preset time zone as a driving condition, and when the water temperature in the tank falls below a preset temperature during the time zone, the control means drives the heating element to adjust the temperature so as to increase the water temperature. The hot water apparatus for an elevator according to claim 6 or 7,

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