JP2010029172A - Heating system for greenhouse - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite-type heating system for a greenhouse, having both an electrothermal heating apparatus and a fuel burning heating apparatus. <P>SOLUTION: This heating system is configured such that a fuel burning warmer 2 and an electrothermal heating apparatus 3 are connected to each other with a vinyl duct 4, and air which is taken in with a blower 5 of the fuel burning warmer 2 is heated with a burner 6 or an electrothermal heater 16. When the room temperature in a greenhouse becomes ≤15°C, the electrothermal heater 16 and the blower 5 are operated, and when the room temperature in the greenhouse further drops to be ≤10°C, the burner 6 is operated in addition to the electrothermal heater 16 and the blower 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a greenhouse heating system that supplies warm air to a greenhouse for horticultural horticulture (hereinafter referred to as a greenhouse) to keep the space in the greenhouse at a desired temperature.

  As a heat source of a conventional greenhouse heating system, a combustion heater (for example, Patent Document 1) that heats air by burning fuel oil, and an electric heater (for example, Patent Document 2) that heats air by electric heating )It has been known. Combustion heaters have the advantage that they can easily handle large-scale greenhouses because they can generate a large amount of heat, but are relatively difficult to maintain and operate. On the other hand, the electric heater is easy to maintain and operate. Therefore, in recent years, an electric heater has been attracting attention.

JP 2002-305992 A JP 2007-292431 A

  However, since the electric power that can be supplied at a low voltage (100V or 200V) from the commercial power source is limited to 50 kW or less, when a large-scale greenhouse is heated with an electric heater, a high voltage (6000 V) is used. Since power receiving equipment (such as a transformer) for receiving power is required, there is a problem that the equipment cost increases.

  In addition, there is a demand from customers who want to utilize an existing combustion heater while introducing an electric heater to expand the scale of a greenhouse.

  This invention is made | formed in view of such a background, and provides the composite-type greenhouse heating system provided with both the electric heating type heater and the combustion type heater.

  The greenhouse heating system according to the present invention includes a combustion heater, an electric heating heater, and a blower arranged in series in a single air passage, and the air taken from one end of the air passage by the blower is the combustion It heats with a type heater or the said electric heating type heater, and it sends out from the other end of the said ventilation path.

  Further, in addition to the above-described configuration, when the room temperature of the greenhouse becomes equal to or lower than the first predetermined temperature, the electric heater and the blower are operated, and the room temperature of the greenhouse is further decreased from the first predetermined temperature. And if it becomes below 2nd predetermined temperature, in addition to the said electrothermal heater and the said air blower, you may provide the control means which operate | moves the said combustion heater.

  Further, in addition to the above-described configuration, the electric heating heater is disposed on the downstream side of the combustion heating device in which the combustion heater and the blower are integrated, and the combustion heating is performed via a duct. A machine and the electric heating heater may be connected.

  Furthermore, two sets of the electric heating heaters are provided, and the air passage is bifurcated at the outlet of the combustion heater, and the electric heater is provided at each end of the air passage branched in two. It may be arranged.

  Further, when operating only the electric heating heater and the blower, the control means supplies driving power from the electric heating heater to the blower, in addition to the electric heating heater and the blower. When operating the combustion heater, the combustion heater may be provided with switching means for supplying driving power from the combustion heater to the blower.

  Alternatively, a blower is disposed at one end of the air passage, and an electric heater is disposed at the other end of the air passage, and the air taken into the air passage by the blower is heated by the electric heater. Further, it may be configured to send out from the other end of the air passage.

  According to the present invention, since the combustion heater and the electric heater are arranged in series in one air passage, a high-power greenhouse heating system can be easily realized. Moreover, since the heating system for greenhouses of this invention can be constructed by adding an electrothermal heater to an existing combustion heater, it can be constructed at a low cost.

  Hereinafter, the best mode for carrying out the present invention will be described.

  FIG. 1 is a conceptual configuration diagram of a greenhouse heating system according to the present invention. As shown in FIG. 1, the greenhouse heating system 1 is configured by connecting one combustion heater 2 and two electrothermal heaters 3 with a vinyl duct 4.

  The combustion warmer 2 includes a blower 5, a combustor 6, a heat exchanger 7, and a combustion controller 8. The combustor 6 is a burner that burns fuel oil (for example, heavy oil), and the heat generated by burning the fuel oil (for example, heavy oil) in the combustor 6 is heated by the heat exchanger 7 and externally combusted by the blower 5. The air taken in the warmer 2 is heated. Thus, the combustor 6 and the heat exchanger 7 constitute a combustion heater. The air heated by the combustion heater (combustor 6 + heat exchanger 7) is sent out to the electric heater 3 through the air outlet 9 and the vinyl duct 4.

  The combustion controller 8 includes a thermometer 10, and when the temperature detected by the thermometer 10 (that is, the room temperature of the greenhouse in which the greenhouse heating system 1 is installed) becomes 10 ° C. or less, The current for driving the combustor 6 is supplied to the fan power line 12 through the current for driving the fan 5. Here, the combustor power line 11 is connected to the combustor 6, while the blower power line 12 is connected to the control panel 13. That is, the current for driving the blower 5 is supplied to the blower 5 via the control panel 13. The electrical connection between the control panel 13 and the blower 5 will be described in detail later.

  Further, there is a signal line 14 between the combustion controller 8 and the control panel 13, and an electrical signal is output to the control panel 13 when the temperature detected by the thermometer 10 becomes 10 ° C. or less.

  Thus, when the room temperature of the greenhouse in which the greenhouse heating system 1 is installed becomes 10 ° C. or less, the combustion type warmer 2 starts operation by driving current flowing through the blower 5 and the combustor 6. At the same time, an electric signal indicating the operation of the combustion heater 2 flows through the signal line 14.

  The electric heater 3 includes a housing 15, an electric heater 16, and an electric heat controller 17, and the air flowing into the housing 15 from one end of the housing 15 through the vinyl duct 4 is converted into the electric heater 16. Is heated from the other end of the casing 15 and is sent to the outside (inside the greenhouse in which the greenhouse heating system 1 is installed).

  The electric heat controller 17 includes a thermometer 18, and when the temperature detected by the thermometer 18 (that is, the room temperature of the greenhouse in which the greenhouse heating system 1 is installed) is 15 ° C. or less, the electric heating power line 19 is electrically heated. A current for driving the heater 5 is supplied to the fan power line 20 through the current for driving the fan 5. Here, the electric power line 19 is connected to the electric heater 16, while the blower power line 20 is connected to the control panel 13. That is, the current for driving the blower 5 is supplied to the blower 5 via the control panel 13.

  As described above, when the room temperature of the greenhouse in which the greenhouse heating system 1 is installed becomes 15 ° C. or less, the electric heater 3 starts operation when a drive current flows through the electric heater 16. At the same time, power is supplied to the blower 5 through the blower power line 20.

  The control panel 13 is provided with a relay 21 as shown in FIG. 2, and the blower power line 12 and the signal line 14 of the combustion heater 2 and the blower power line 20 of the electric heating heater 3 are connected to the relay 21. Connected. Further, the relay 21 and the blower 5 are communicated with each other through an output line 22 (see also FIG. 1).

  When the combustion heater 2 is not in operation, no electrical signal flows through the signal line 14, so the coil 23 of the relay 21 is not excited. At this time, each contact of the relay 21 is in the state shown in FIG. 2, and the blower power line 20 and the output line 22 of the electric heating type heater 3 are connected. In this state, when the room temperature of the greenhouse becomes 15 ° C. or lower and the electric heating heater 3 starts to operate, electric power for driving the blower 5 is supplied from the electric heat controller 17 to the blower 5. That is, only the blower 5 of the combustion warmer 2 is operated in a state where the combustion warmer 2 has stopped operating (no fuel oil is burned by the combustor 6).

  When the room temperature of the greenhouse further decreases to 10 ° C. or less, the combustion warmer 2 starts operation (ignites the combustor 6). At this time, an electric signal flows through the signal line 14, the coil 23 of the relay 21 is excited, and each contact of the relay 21 is switched. Therefore, the connection between the blower power line 20 and the output line 22 of the electric heater 3 is cut off, and the blower power line 12 of the combustion warmer 2 is connected to the output line 22. That is, the electric power for driving the blower 5 is supplied from the combustion controller 8 to the blower 5.

  Thus, when the room temperature of the greenhouse is relatively high, that is, when the load on the greenhouse heating system 1 is small, the greenhouse heating system 1 stops the operation of the combustion heater 2 and is electrically heated. Since only the heater 3 and the blower 5 are operated, consumption of the fuel oil of the combustion type warmer 2 can be reduced.

  Moreover, since the room temperature of a greenhouse falls and both the combustion type warmer 2 and the electrothermal heater 3 are drive | operated, it can respond to a heavy load.

  Further, in this embodiment, the combustion heater 2 is provided with the heat exchanger 7 so that the combustion gas (exhaust gas) generated in the combustor 6 does not flow into the greenhouse. The warmer is not limited to this type. The heat exchanger 7 may be omitted, and the combustion gas generated in the combustor 6 may be directly flowed into the greenhouse. Alternatively, the combustion gas may be diluted with fresh air and sent into the greenhouse.

  Moreover, since the greenhouse heating system 1 can be constructed only by adding the electric heating heater 3 and the control panel 13 to the existing combustion heater 2, the existing equipment is not wasted. In addition, the output of existing equipment can be increased relatively inexpensively.

  In addition, since the fan 5 (combustion heater 2) and the electric heater 3 are connected by the vinyl duct 4, the electric heater 3 can be installed near the object to be heated. For this reason, even when the blower 5 (combustion heater 2) and the object to be heated are separated from each other, there is no heat loss (temperature decrease) in the route (that is, the vinyl duct 4). Is good.

  Further, the greenhouse heating system 1 can be configured by omitting the combustion heater (combustor 6 + heat exchanger 7). For example, the function of the combustor 6 of the existing combustion heater 2 may be stopped, and only the function of the blower 5 may be left to constitute the greenhouse heating system 1.

  Further, a wind pressure sensor (for example, a plate that is hinged at one end in the housing 15 and swings in response to the wind of the blower 5), and a limit switch that detects the movement of the plate are installed inside the electric heater 3. And a safety device that stops power supply to the electric heater 16 when the wind pressure sensor does not detect the wind of the blower 5.

  In the present embodiment, the operation start condition of the electric heater 3 is set to room temperature 15 ° C. or less, and the operation start condition of the combustion heater 2 is set to room temperature 10 ° C. or less. The technical scope of the present invention is not limited thereby. Of course, the temperature of the greenhouse managed by the greenhouse heating system 1 varies depending on the properties of the plants cultivated in the greenhouse, and the conditions for starting the operation of the electric heating heater 3 and the combustion heater 2 are as follows. Needless to say, various conditions are selected.

It is a notional block diagram of the greenhouse heating system which concerns on this invention. It is a connection diagram of the relay with which the heating system for greenhouses concerning this invention is equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Greenhouse heating system 2 Combustion type warmer 3 Electric heating type heater 4 Vinyl duct 5 Blower 6 Combustor 7 Heat exchanger 8 Combustion controller 9 Outlet 10 Thermometer 11 Combustor power line 12 Blower power line 13 Control panel DESCRIPTION OF SYMBOLS 14 Signal wire 15 Case 16 Electric heater 17 Electric heat controller 18 Thermometer 19 Electric power line 20 Blower power line 21 Relay 22 Output line 23 Coil

Claims (6)

A combustion heater, an electric heater, and a blower are arranged in series in one air passage,
The air taken from one end of the air passage with the blower is heated by the combustion heater or the electric heater,
A greenhouse heating system characterized by being sent out from the other end of the air passage. When the room temperature of the greenhouse becomes equal to or lower than the first predetermined temperature, the electric heater and the blower are operated, and the room temperature of the greenhouse is further decreased from the first predetermined temperature to be equal to or lower than the second predetermined temperature. Then, in addition to the electric heater and the blower, control means for operating the combustion heater is provided. The greenhouse heating system according to claim 1, wherein: The electric heater is arranged downstream of the combustion heater that integrally forms the combustion heater and the blower, and the combustion heater and the electric heater are connected via a duct. The greenhouse heating system according to claim 2, wherein: Two sets of the electric heater are provided,
The said air flow path is bifurcated at the outlet of the combustion-type warmer, and the electric heating heater is disposed at each end of the air flow path branched into the bifurcation. Greenhouse heating system. When the control means operates only the electric heater and the blower, the controller supplies power to the blower from the electric heater, in addition to the electric heater and the blower, 5. The greenhouse heating system according to claim 3, further comprising a switching unit configured to supply driving electric power from the combustion-type warmer to the blower when the combustion-type heater is operated. . A blower is disposed at one end of the air passage, and an electric heater is disposed at the other end of the air passage,
The greenhouse heating system, wherein the air taken into the air passage by the blower is heated by the electric heater and sent from the other end of the air passage.

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