JPH10170U - Topsoil heating device - Google Patents

Abstract

(57) [Summary] [Objective] To propose a topsoil heating device that uses heat generated by a canned motor pump as a heat source, has a simple configuration in terms of equipment, and is advantageous in cost. [Structure] In a heat medium for circulation put in a tank (1),
An axial flow through type canned motor pump (3) is installed, and by operating the pump, a cold heat medium at the lower part of the tank is sucked from the inlet (4), and the heat medium heated by the heat generated by the stator and the rotor in the pump. Is discharged from the outlet (5), and a flow path (6) for circulating the heat medium from the outlet (5) to the return port of the tank is provided, and a part of the flow path is laid underground. Then, a heat radiating section (8) as a means for heating the topsoil is provided at the underground laying position.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a topsoil heating device that utilizes heat generated by a canned motor pump as a heat source.

[0002]

[Problems of conventional technology]

 Conventionally, a method using steam, hot water, or an electric heater as a heating heat source for an agricultural or horticultural greenhouse has been known. However, all of the above methods require a pump to circulate the heat medium, and additionally require the installation of an electric heater or oil boiler, etc. There is a problem that the cost is high.

[0003]

[Problems to be solved by the invention]

 The present invention has been made in view of the above-mentioned drawbacks of the prior art, and aims to provide a topsoil heating apparatus which uses a heat generated by a canned motor pump as a heat source, has a simple structure in terms of equipment, and is advantageous in cost. is there.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention installs an axial through-flow type canned motor pump (3) in a circulating heat medium contained in a tank (1), and operates the tank from an inlet (4) by operating the pump. The lower cooling medium is sucked in, and the heating medium heated by the heat generated by the stator and rotor in the pump is discharged from the outlet (5). Then, the tank is returned from the outlet (5). A flow path (6) for circulating the heat medium leading to (7) is provided, a part of the flow path is laid underground, and a heat radiating part (8) as a means for heating topsoil is laid at the underground laying point. It is intended to propose a topsoil heating device characterized by having

The canned motor pump used in the present invention is an axial flow type canned motor pump, in which a heat medium passes through a can pipe, and a stator core and a rotor core have a thickness of 0.5 to 1.6 mm of mild steel. It is formed using a plate (carbon content C = 0.03 to 0.4%), and enhances the heat generation from the steel plate constituting the core when energized.

The heat radiating section (8) is buried in soil, specifically, in a greenhouse for forcing cultivation or a greenhouse for horticulture. The heat radiating portion is, for example, a panel. This underground panel has pipes through which heat medium passes. Further, the heat radiating section may be formed as a mat. A supply pipe through which the heat medium passes is provided in the mat. In addition, this heat radiation part is not limited to a panel or a mat.

[0007]

【Example】

 Next, the configuration of the device of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present apparatus. In the figure, reference numeral 1 denotes a container (tank) in which a circulating heat medium B is enclosed. As an example, a cylindrical or square cylindrical container having a diameter of 350 mm and a height of 560 mm Are used. Into this container, 40 liters of an aqueous solution containing propylene glycol as a main component (trade name: Weston brine WB PB: manufactured by CCI Co., Ltd.) as a heat medium B was placed and opened. The upper surface is sealed with the lid 2. The canned motor pump 3 is installed so as to be immersed in the heat medium B. It is configured such that a cold heat medium B at the lower part of the sealed container 1 is sucked from the inlet 4 of the pump, and the heat medium heated by the heat generated by the stator and the rotor of the pump is discharged. A flow path (circulation line) 6 for circulating the heat medium from the outlet 5 to the return port 7 to the container is provided.

As shown in FIG. 4, a part of the circulation channel 6 is laid in the ground, and a heat radiating portion 8 as a means for heating the soil is provided at the laid portion in the ground. . As the heat radiating section 8, a panel as illustrated in FIG. 3 is used, and the heat medium B flows through the heat medium supply pipe 9 of the panel.

FIG. 4 is an explanatory view in which the heating panel 8 a of FIG. 3 is buried in a nursery or cultivated land in a greenhouse or horticultural greenhouse 10. As an example, it is used by burying it at a depth of about 20 cm 2 from the ground surface GL. FIG. 3 is a plan view in which a plurality of heating panels 8a are arranged side by side. Inside the panels, for example, a heating medium supply pipe 9 configured to form a loop is disposed. .

The place where the heat radiating section 8 is buried is not limited to the soil in the house, but may be an open field. The point is that the heat radiating section 8 is buried in the soil where the ground temperature is relatively low, and the surface radiating section is heated by this heat radiating section to prevent freezing of agricultural lands and to control the ground temperature.

Next, the configuration of the canned motor pump will be briefly described. The pump used in the present invention is preferably a shaft-through canned motor pump as shown in FIG. Hereinafter, the structure of the present pump will be described with reference to FIG. 2. Reference numerals 21 and 22 denote a metal-made suction port cover and a discharge port cover provided at both ends of the pump, 23 denotes a suction port, and 24 denotes a discharge port. . Reference numeral 25 denotes a stainless steel frame of the pump, and reference numeral 26 denotes frame side plates at both ends. At the center of the pump is disposed a main shaft indicated by reference numeral 27, which is supported by thrust bearings 28 and bearing supports 29 at both ends. An impeller 30 is fixed to one end of the main shaft 27 at the suction port side. The impeller 30 is configured to be integrally rotated by the rotation of the main shaft. Reference numeral 32 denotes a rotor core fixed integrally to the main shaft via a rotor support member 31 outside the main shaft. The rotor core 32 and its support member 31 are disposed so as to be immersed in a liquid passing through the center of the pump.

Reference numeral 33 denotes a stator core disposed between the core 32 and the frame 25 so as to be opposed to the rotor core 32, and reference numeral 34 denotes a stator coil. The stator core and the stator coil are configured so as to be shielded from the heat transfer medium by a stainless steel can pipe 35 provided between the rotor core 32 and a can O-ring retainer indicated by reference numeral 36 and a frame side plate 26. Have been.

[0013] The pump used in the present invention employs the following structure in order to enhance the heat generation during energization. That is, as the material of the stator core and the rotor core, a material having a large iron loss, preferably, a mild steel plate having a thickness of 0.5 to 1.6 mm (carbon content C = 0.03 to 0.4%) is used for the stator core and the rotor core. To increase the heat generation from the core when the pump is energized. In FIG. 1, reference numeral 37 denotes a power cord of the canned motor pump 3 and 38 denotes a temperature sensing sensor installed in the container 1, and the heat transfer medium B in the container 1 rises above a predetermined temperature. The pump 3 is electrically connected via a control device so that the pump 3 automatically starts when the pump 3 stops or the temperature drops below a predetermined temperature (not shown). Although not shown in the drawing, a temperature control sensor for preventing overheating is attached to the stator coil 34 of the motor, so that the operation of the machine is automatically stopped at the time of overload.

[0014]

[Action]

 In FIG. 1, when the canned motor pump is energized, the impeller rotates to draw in a cold heat medium at the lower part of the tank from the inlet 4. The heat medium passes through the pump, is pushed into the circulation line 6 from the outlet 5, passes through the heat radiating section 8, and returns to the container 1 again. In the process in which the heat medium B is pumped and returned through the circulation line, the rotor core 32 and the stator core 33 of the pump generate heat, and the heat is transferred to the heat medium passing through the center of the pump through the covers 21 and 22 and the can pipe 35. In addition, the heat transfer medium B around the pump is heated. The heated heat medium B is supplied to the heat radiating section 8, where the heat radiating section 8 heats an object to be heated (for example, soil in a greenhouse).

As described above, the pump used in the present apparatus has the internal stator and the rotor core formed of a magnetic material having a high heat generation property. The heating medium B in the container 1 is heated without providing a heater. The pump used is a canned structure pump that can be used by being immersed in a liquid. The pump is of an axial flow-through type, in which a heat medium as a system liquid flows through the center of the pump, so that the heat exchange efficiency with respect to the heat medium B is excellent. I have.

[0016]

[Effect of the invention]

 As described above, according to the present invention, the heat generated from the canned motor pump can be used as a heat source, so that the power can be used without waste, and the equipment is simple in configuration. It is possible to provide a topsoil heating device in cold regions, and it is highly practical in that it does not require an additional electric heater or oil boiler as a heat source.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing an overall configuration of a topsoil heating apparatus according to the present invention.

FIG. 2 is a cutaway perspective view of a main part of a canned motor pump used in the present invention.

FIG. 3 is a plan view in which a plurality of heating panels 8a are juxtaposed.

FIG. 4 is an explanatory view in which a heating panel 8a is disposed underground in an agricultural greenhouse or a horticultural greenhouse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Lid 3 Canned motor pump 4 Inlet 5 Outlet 6 Circulation line 7 Return port 8 Heat radiating part 8a Heating panel 9 Heat medium supply pipe 10 Greenhouse

Claims (3)

[Utility model registration claims] An axial flow-through type canned motor pump (3) is installed in a circulating heat medium placed in a tank (1), and by operation of the pump, a cold heat medium at a lower portion of the tank from an inlet (4). And the heat medium heated by the heat generated by the stator and the rotor in the pump is discharged from the outlet (5), and the heat from the outlet (5) to the return port (7) of the tank is formed. It is characterized in that a channel (6) for circulating the medium is provided, a part of the channel is laid underground, and a heat radiation part (8) as a means for heating the topsoil is provided at the place where the channel is laid underground. Topsoil heating device. 2. The topsoil heating apparatus according to claim 1,
The heat radiating section (8) is a topsoil heating device which is a heating panel buried underground in an agricultural house or a horticultural greenhouse. 3. The topsoil heating apparatus according to claim 1,
The heating medium is a topsoil heating device that is an organic solution containing glycol as a main component.