JPS58131712A - Electromagnet for heat pump cooling lifting type magnet, etc. - Google Patents

Abstract

PURPOSE:To enhance performance of the electromagnet by a method wherein the reservoir part for an working fluid and the condensation part to cool the evaporated working fluid of the heat pump are provided to radiate efficiently Joule heat in a coil. CONSTITUTION:Because the coil 3 is immersed in the working fluid 6, heat generated according to turning on electricity of the coil 3 is removed as the heat of evaporation due to the boiling of the working fluid 6. The evaporated working fluid 6 ascends passing through air vents 7, delivers heat of a large quantity at condensing fins 9, and heat thereof is radiated in the atmosphere from radiating fins 10 at the condensation part having small heat resistance between the atmosphere. While the working fluid 6 is condensed to be liquefied, it does not come in the air vents 7 being interrupted by ring type dams 7a, descends in liquid passage holes 8, and flows back to the reservoir part at the circumference of the coil, is evaporated again to absorb heat of the coil 3, and cools the coil effectively through working circulatingly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnet such as a nine-lifting magnet that uses a cooling method using a heat pump to enhance the cooling effect of the coil.

An example of the structure of a conventional adhesive magnet will be described with reference to FIG. In the figure, since each member is symmetrical, the right half is shown with a reference numeral. 1 is a yoke 5laelb is a magnetic pole, 2 is a non-magnetic plate, 3 is a coil, and 4 is an insulator covering the coil.

In the above configuration, energizing the coil 3 K
A magnetic field is generated, and a magnetic flux φ1* is applied to the object to be lifted and the yoke 1 facing the a-poles 1a and lb.

The lifting magnet body is attached to a transport device such as a crane, and is lifted up by electromagnetic force to transport round objects.

By the way, with the above configuration, the 9 joule heat generated by energizing the film 3 is transmitted from the insulator 4 to the mesh 1 and radiated into the atmosphere.

Since the insulator 4 has a large thermal resistance, the heat generated in the coil 3 is difficult to conduct, so the heat accumulates in the coil 3 and the temperature of the coil 3 becomes high. If the temperature of the coil 3 increases, the electrical resistance increases and the generation of Joule heat increases, which further promotes the temperature rise of the coil.

Due to this rounding of the coil temperature rise, conventional lifting magnets have the disadvantage that they can only supply a small current below the heat resistance limit and that reactive power increases due to increased electrical resistance.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and to improve the performance of electromagnets such as lifting magnets by applying a heat pump cooling method to efficiently dissipate Joule heat in the coil. This is what I did.

The present invention will be described below with reference to embodiments relating to two glued magnets.

In the first embodiment No. 211, 1 to 3 indicate members equivalent to the members shown in No. 1E. 5 is a round spacer that fixes the coil 3 to the yoke 1. Reference numeral 6 denotes a working fluid of the heat pump, and 9 is a fluid such as Freon 112, which is stored in a storage portion formed in a space between the yoke 1 and the non-magnetic plate 2 around the coil 3.

Reference numeral 7 denotes a vent hole opened in the sluice 1, which is a passage for vaporized working fluid to rise. Reference numeral 8 denotes a liquid passage hole formed in the yoke 1, which is a passage through which liquefied working fluid descends and flows back into the reservoir around the coil. A partial pupil view of an example of the ventilation hole 7 and the liquid passage hole 8 is shown in FIG. 3. 7m is an annular weir;
The liquefied working fluid is prevented from entering the vent hole 7. In FIG. 2, 9 is a condensing fin, 10 is a radiation fin, and both 9 form a condensing section. An example of the condensation part is shown in the fourth example.
The vaporized working fluid shown in the figure is liquefied by the condensing fins 9, which remove the heat of vaporization. The heat of vaporization received by the condensing fins 9 is radiated into the atmosphere by the radiation fins 10.

In the above configuration, since the coil 3 is immersed in the working fluid 6, the heat generated by energizing the coil 3 is removed as heat of evaporation due to boiling of the working fluid 6. The vaporized working fluid 6 rises through the ventilation holes 7, transfers a large amount of heat to the condensing fins 9, and the heat is dissipated into the atmosphere (through the radiating fins 1o of the condensing section, which have low thermal resistance to the atmosphere). . Meanwhile, the working fluid 6 is condensed and liquefied.

The annular weir 7aKjl prevents it from entering the ventilation hole 7,
The liquid flows down through the liquid passage hole 8 to the reservoir Kll around the coil. Then, it vaporizes again to remove heat from the coil 3, and circulates to effectively cool the coil.

Second Embodiment The second embodiment is a simplified version of the first embodiment, and an example thereof is shown in FIG. The difference from the first embodiment is that the same passage hole 11 serves as both the two ventilation holes 7 and the liquid passage hole 8, and there are nine points. In this case, if the working fluid that vaporizes and rises and the working fluid that liquefies and descends pass through the same passage hole 11, then K. Although the structure is simplified, the cooling effect of the coil is the same as in the 111th embodiment.

It should be noted that all of the above embodiments describe lifting magnets, and the present invention can also be applied to electromagnets for separating iron pieces and the like.

As described above, the electromagnet such as the heat pump cooling type lifting magnet according to the present invention is cooled by the working fluid taking away the heat generated by the coil.

The fill is effectively cooled, making it possible to flow a large current below the heat resistance limit of the coil, and the electrical resistance of the coil does not increase, reducing reactive power and increasing magnetomotive force, making it suitable for lifting magnets, etc. This has the extremely excellent effect of dramatically improving the performance of electromagnets and making them smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view showing an example of the configuration of a conventional lifting magnet, FIG. 2 is a front view of a right half section showing a first embodiment of the present invention, and FIG. FIG. 4 is a partial cross-sectional perspective view showing an example of the details of the liquid passage hole I/IA; FIG. 4 is a partial cross-sectional perspective view showing an example of the details of FIG. 2; FIG. It is a right half cross-sectional front view. 1: York. 3: Coil. 6: Working fluid. 7: Ventilation hole. 8: Liquid passage hole. 11: Passage hole. Fig. 1 φ1 Fig. 2 113 Fig. 4 0 Fig. 5 [: H'

Claims (1)

[Claims] 1. Working fluid of the heat pump (6) around the coil (3).
) is provided, and 4 is vaporized and 9 working fluid (6) is provided.
It is equipped with a condensing section that cools the vaporized working fluid (6
) to the condensing section, and a liquid passage hole (8) that allows the working fluid (6) liquefied in the condensing section to flow back to the storage section.
An electromagnet such as a heat pump cooling type lifting magnet characterized by having a yoke (1) K and a yoke (1) K. 2. The ventilation hole (A) that carries the vaporized working fluid (6) to the condensing section and the liquid passage hole (8) that allows the working fluid (6) liquefied in the condensing section to flow back to the storage section are connected in the same passage. An electromagnet having a heat pump cooling type lifting magnet according to claim 1, which also serves as a hole (11).