UA103140C2 - Vertical ring high gradient magnetic separator - Google Patents

Abstract

The invention discloses a vertical ring high gradient magnetic separator, comprising an excitation winding coil (11) and a coil housing (12). The winding coil (11) is immersed in a cooling liquid of the coil housing (12). The winding coil (11) is a multilayer structure, insulating parts are installed between each layer or multiple layers of the winding coil (11) so as to form gaps where the cooling liquid can pass. The winding coil of the vertical ring high gradient magnetic separator has rapid heat dissipation ability in the cooling liquid, and can ensure a low temperature of the winding coil during operation, thus obtaining high magnetic field intensity.

Description

The field of technology

This invention relates to the field of mineral separation equipment and, in particular, to a vertical ring high-gradient magnetic separator.

Technical level

One of the traditional main methods of wet separation of weakly magnetic minerals is the separation of materials using a vertical ring high-gradient magnetic separator.

The vertical ring high-gradient magnetic separator is a type of device for wet separation of weakly magnetic minerals using a stronger magnetic field generated by a cooled winding coil having a reduced temperature. The separation principle of the vertical ring high-gradient magnetic separator is as follows: the magnetic field generated by the winding coil passes through the upper and lower yoke of the magnet, forming a magnetic circuit; in the space between the upper and lower yokes of the magnet and the winding coil, a rotating ring installed with a magnetic medium is provided. The lower part of the rotating ring is immersed in the ore slurry, and with the rotation of the rotating ring, the magnetized medium absorbs the magnetic particles of minerals on the surface of the magnetic medium.

After the rotating ring forces the magnetic medium immersed in the ore slurry to leave the ore slurry and return to a certain angle, the pressure water supplied from the top of the rotating ring splashes the magnetic mineral particles into the concentrate collecting device to achieve material separation.

A stronger magnetic field is required to effect the separation of weakly magnetic minerals, and this magnetic field is generated mainly by the winding coil. From a technical perspective, it follows that when the winding coil has constant parameters, such as the number of turns, wire diameter, material, current, voltage, the higher the temperature rise of the coil, the greater the resistance of the wire, and the greater the thermal drop of the magnetic field, and in addition , the insulation of the coil gradually deteriorates.

At this time, the cooling method of the vertical annular high-gradient coil mainly includes the internal cooling method and the external cooling method.

The method of internal cooling involves the use of a copper hollow connecting wire, and cooling water is injected into this electrical wire to remove heat.

Because the water contains some impurities, during the process of long-term use, the cooling water easily forms lime scale, blocking the coil opening and thereby causing a high failure rate. In addition, the cooling water is drained directly after use, which causes a serious waste of water resources, and there are other disadvantages such as high copper consumption, high cost and complicated process.

With external cooling, the coil is immersed in cooling oil, and this cooling oil circulates outside the winding coil, dissipating the heat using a cooling device in the circulation circuit. The cooling effect of this cooling method depends mainly on two aspects: the ability of the cooling oil to timely remove heat from the winding coils and the ability of the cooling device to dissipate the heat of the cooling oil. Regarding the first aspect, the existing profiled winding coil usually forms a compact object, and only the outer surface of the winding coil can directly contact with the cooling oil, so the cooling oil can only take away the heat on the outer surface of the winding coil in time, and the heat generated inside winding coils, can only be first transferred to the outer surface of the winding coil, and only then transferred to the cooling oil. Due to the limitation of heat transfer efficiency, a lot of heat can accumulate inside the winding coil and cannot be dissipated, thereby causing an increase in the temperature of the entire winding coil in general and a decrease in the magnetic field voltage.

Therefore, the technical task that must be solved by specialists in this field of technology is to improve the ability of the coil of the winding of the vertical ring high-gradient magnetic separator to dissipate heat in the coolant in order to guarantee the maintenance of a lower temperature by the coil of the winding during operation and thus - obtaining an increased voltage magnetic field.

Brief description of the invention

The task of this application is to develop a vertical ring high-gradient magnetic separator. The coil of the winding of the vertical ring high-gradient magnetic separator has the ability to quickly dissipate heat in the coolant, which guarantees the maintenance of a lower temperature by the coil of the winding during operation and thus - obtaining an increased voltage of the magnetic field.

To solve the above-mentioned problem, according to this application, a vertical ring high-gradient magnetic separator is proposed, which includes an excitation winding coil and a coil casing, and the winding coil is immersed in a coolant in the coil casing and has a multilayer structure, and between each layer or multiple layers of the coil an insulating element is provided for the windings to form gaps through which the coolant passes.

The insulating element preferably includes the first insulating spacer strips located between each layer or a plurality of layers of the winding coil, located with an inclination relative to the direction of the coolant flow and distant from each other.

For the connection of the first insulating spacer strips, second insulating spacer strips are preferably provided, which are located, cutting the first insulating spacer strips, and are introduced into the cutouts of the first insulating spacer strips.

The second insulating spacer strips are preferably located along the flow direction of the coolant, and each of them has a thickness less than or equal to the depth of each of the cutouts of the first insulating spacer strips.

The first insulating spacer strips preferably have a two-layer structure or a multilayer structure, and the layer of each of the first insulating spacer strips, which intersects the second insulating spacer strips, has a multi-segment structure, and the space between adjacent segments of the layer forms each of the cutouts.

Preferably, between the inner side of the winding coil and the annular inner wall of the coil casing, third insulating spacer strips are vertically provided, spaced apart from each other, and on the side close to the annular inner wall, each of the third insulating spacer strips is provided with liquid-directing cutouts, spaced apart from each other from one

The third insulating spacer strips are preferably attached to the annular inner wall.

Preferably, a fluid inlet and a fluid outlet of the coil casing are respectively located at the two ends of the coil casing.

The fluid inlet and fluid outlet of the coil casing are preferably located at the same end of the coil casing, and a baffle is provided inside the coil casing to separate the fluid inlet from the fluid outlet.

Preferably, a liquid expansion tank is installed in the upper part of the coil casing, which communicates with the coil casing, and a moisture-proof breathing valve is installed in the air inlet of the liquid expansion tank.

The vertical ring high-gradient magnetic separator of the invention provides further improvements over the prior art. The winding coil of the vertical ring high-gradient magnetic separator has a multilayer structure, and an insulating element is provided between each layer or a plurality of layers to form gaps through which the coolant can pass. Thus, after entering the coil jacket through the liquid inlet during operation, the coolant can flow between each layer or multiple layers of the winding coil, so that the contact area between the coolant and the winding coil is increased, and the coolant can be in contact with the coil windings in different positions, which is enough for heat exchange, and then the heat-transferring coolant flows to the liquid outlet through the gaps, dissipating the heat generated by the winding coil, and this ability to dissipate heat quickly can ensure that the winding coil maintains a lower temperature under time of operation and thereby - obtaining an increased voltage of the magnetic field.

In an embodiment, the insulating element includes first insulating spacer strips, and the first insulating spacer strips between each layer or a plurality of layers of the winding coil are inclined relative to the direction of flow of the coolant and are spaced apart from each other.

Since the first insulating spacer strips are inclined relative to the direction of coolant flow and are spaced apart between each layer or a plurality of layers of the winding coil, a plurality of relatively independent coolant channels can be formed so that the coolant can flow through the coil through these channels, not creating a turbulent flow. In addition, the inclined arrangement can reduce the resistance to the coolant, on the one hand, so that the coolant can flow through the winding coil smoothly, and it will be possible to obtain an increased length of the channel, and on the other hand, so that the coolant and the winding coil will be able to contact each other to a degree sufficient for heat exchange.

In another embodiment, between the inner side of the winding coil and the annular inner wall of the coil casing, third insulating spacer strips are vertically provided, spaced apart from each other, and on the side close to the annular inner wall, each of the third insulating spacer strips is provided with cutouts that direct liquid, distant from each other.

Thus, the coolant enters the liquid inlet chamber of the coil casing through the liquid inlet hole, then flows with an inclination through the gaps of the winding coil, and then can smoothly flow into the oil return chamber through the liquid-directing cutouts of the third insulating spacer strips.

Brief description of the drawings

Fig. 1 - a partial cross-sectional view of a vertical annular high-gradient magnetic separator according to an embodiment of this application, while the arrows in the drawing indicate the direction of the flow of cooling oil and the direction of the flow of water that splashes the ore, respectively;

fig. 2 - a view from the left of the vertical ring high-gradient magnetic separator shown in fig. 1, while a part of the winding coil is shown in section; fig. C is a complete schematic section of the winding coil and the coil casing shown in Fig. 1 fig. 4 is a partial schematic view on an enlarged scale of part I shown in fig. WITH; fig. 5 - a schematic view along the line A-A from fig. WITH; fig. 6 is a partial schematic view on an enlarged scale of a part of HER shown in fig. 5; fig. 7 is a partial schematic view illustrating the connection between the first insulating spacer strips and the second insulating spacer strips; fig. 8 - a schematic view along the line A-A from fig. 7; fig. 9 is a cross-sectional view illustrating another connection between the first insulating spacer strips and the second insulating spacer strips; fig. 10 - a top view of another winding coil and another coil casing; and fig. 11 is a partial schematic view on an enlarged scale of part II shown in fig. 10.

The list of reference positions in Fig. 1-11: 1 - Machine frame; 2 - Upper magnet yoke;

C - Lower magnet yoke; 4 - Rotating ring; - Ceber for distributing ore; 6 - Ceber for splashing water; 7 - Device for collecting concentrate; 8 - Environment bunker; 9 - Bunker of tails; - Pulsating bunker; 11 - Winding coil; 12 - Coil cover; 12-1 - Oil inlet; 12-2 - Oil outlet; 13-1 - The first insulating spacer strip; 13-2 - Second insulating spacer strip; 13-3 - Third insulating spacer strip; 13-3-1 - Notches directing liquid; 14 - Partition; - Compensating oil tank; 16 - Breathing valve.

Detailed description of the invention

The task of this invention is to create a vertical ring high-gradient magnetic separator. The winding coil of the vertical ring high-gradient magnetic separator has the ability to quickly dissipate heat in the coolant, which guarantees the maintenance of a lower temperature by the winding coil during operation and thus - obtaining an increased voltage of the magnetic field.

In order for experts in this field of technology to be able to better understand the technical solutions according to the invention, below is also a detailed description of the present invention with reference to the attached drawings and implementation options.

Terms indicating directions and positions such as "up (top), down (bottom), left (left) and right (right)" are based on the positional relationship of the drawings and should not be interpreted as an absolute limitation, which overlaps with the scope of protection of this application. Similarly, the terms "first" and "second" are used herein only for ease of description, to distinguish between different components having the same name, and are not intended to indicate order or primary or secondary dependence .

Let's turn to fig. 1 and 2. Fig. 1 shows a partial cross-section of a vertical annular high-gradient magnetic separator according to an embodiment of the invention, while the arrows in the drawing indicate the direction of the flow of cooling oil and the direction of the flow of water splashing the ore, respectively, and in Fig. 2 is a left side view of the vertical ring high-gradient magnetic separator shown in FIG. 1, while a part of the winding coil is shown in section.

In an embodiment, a frame 1 of the machine is provided in the vertical ring high-gradient magnetic separator. On the upper part of the frame 1 of the machine, the upper yoke 2 of the magnet and the lower yoke Z of the magnet are installed. Two bearing supports of the rotating ring 4 are installed on the upper yoke 2 of the magnet, and the body of the ring belonging to the rotating ring 4 is located between the upper yoke 2 of the magnet and the lower yoke C of the magnet. In the inner space between the two sides of the ring body, there are provided a hopper 5 for supplying ore, a hopper 6 for splashing water and a device 7 for collecting concentrate, and a hopper 8 of the medium is provided on the periphery of the rotating ring. During the continuous rotation of the rotating ring 4, the hopper 8 of the medium is continuously introduced into the ore slurry between the upper yoke 2 of the magnet and the lower yoke C of the magnet for adsorption of magnetic particles.

After the rotating ring 4 forces the magnetic medium immersed in the ore slurry to leave the ore slurry and return to a certain angle, the pressure water supplied from the top of the rotating ring splashes the magnetic mineral particles into the concentrate collecting device 7 to achieve material separation .

A tails hopper 9 is provided in the lower part of the frame 1 of the machine, and the level of ore sludge in the tails hopper 9 (empty rock, sludge) continuously fluctuates up and down under the influence of the pulsating hopper 10, which leads to the splashing of particles absorbed in the hopper 8 of the medium, and thereby enriching the concentrate.

Let's turn to fig. 3-6. In fig. A complete schematic cross-section of the winding coil and the casing of the coil shown in Fig. 1; in fig. 4 is an enlarged partial schematic view of part I shown in fig. WITH; in fig. 5 shows a schematic view along the line A-A according to fig. WITH; and in fig. b is presented on an enlarged scale, a partial schematic view of part Ii, shown in fig. 5.

As shown in the drawings, the coil 11 of the excitation winding is installed on the magnetic pole (around it) of the lower yoke C of the magnet, having an internal arc. The winding coil 11 has a rectangular ring structure and is installed in a hermetic coil casing 12, and the coil casing 12 is made of non-magnetic material, and the winding coil 11 is immersed in cooling oil (or other insulating substance) in the coil casing 12. An oil inlet 12-1 and an oil outlet 12-2 are provided in the middle parts of the two ends of the coil casing 12, and the coil casing 12 is connected to an external cooling device by means of pipes, so that this cooling device can cool the cooling oil.

The winding coil 11 has a multilayer structure, and an insulating element is provided between each layer or a plurality of layers (that is, between all or any of the layers) of the winding coil to form gaps through which the cooling oil can pass. And the insulating element includes the first insulating spacer strips 13-1, which are located between each layer or multiple layers of the winding coil, are located with an inclination relative to the direction of the cooling oil flow and are distant from each other.

In particular (see Fig. 5), the first insulating spacer strips 13-1 are symmetrically distributed along the connection line between the oil inlet 12-1 and the oil outlet 12-2. Taking the first insulating spacer strips 13-1 located on the upper side as an example, we note that, firstly, the first insulating spacer strips 13-1 are located with an upward slope from the oil inlet 12-1 relative to the direction of the cooling oil flow and parallel to each other, and after turning, the first insulating spacer strips 13-1 are located with an inclination from the outer side of the winding coil to the inner side of the winding coil relative to the direction of the cooling oil flow and parallel to each other, until they reach the outlet hole 12-2 for oils

Except for the coil turning section, the angle of inclination between each of the first insulating spacer strips 13-1 and the electric wires of the winding coil 11 is generally between 35" and 70", and its calculated value can usually be 45".

Since the first insulating spacer strips 13-1 are inclined with respect to the flow direction of the cooling oil and are spaced apart from each other, it is possible to form a plurality of relatively independent channels of the cooling oil between two consecutive layers of the winding coil, so that the cooling oil can flow through the winding coil 11 along these channels without creating a turbulent flow. In addition, the inclined arrangement can reduce the resistance to the coolant, on the one hand, so that the coolant can flow through the coil 11 of the winding smoothly, and it will be possible to obtain an increased length of the channel, and on the other hand, so that the coolant and the coil 11 windings will be able to contact each other to a degree sufficient for heat exchange.

It should be noted that the first insulating spacer strips 13-1, located with an inclination relative to the direction of the flow of cooling oil and distant from each other, represent only one variant of implementation. According to practical needs, the first insulating spacer strips 13-1 can also be located vertically with respect to the flow direction of the cooling oil and be at a distance from each other, that is, the direction of passage of the first insulating spacer strips 13-1 is maintained perpendicular to the direction of passage of the electrical wires of the coil windings, and it is also possible to form gaps through which the cooling oil can pass between the layers of the winding coil.

Let's turn to fig. 7 and 8. Fig. 7 is a partial schematic view illustrating the connection between the first insulating spacer strips and the second insulating spacer strips, and in FIG. 8 presents a schematic view along the line A-A from fig. 7.

To prevent movement of the first insulating spacer strips 13-1 during use, second insulating spacer strips 13-2 can be provided. At the bottom of each of the first insulating spacer strips 13-11, one or more cutouts are provided, consistent with the cross-sectional shape of the second insulating spacer strips 13-2. The second insulating spacer strips 13-2 are located, in fact, along the direction of the cooling oil flow. The second insulating spacer strips 13-2 are located intersecting with the first insulating spacer strips 13-1, and are inserted into the cutouts of the first insulating spacer strips 13-1 so that the first insulating spacer strips 13-1 are connected into a single unit and the first insulating spacer strips the strips 13-1 and the second insulating spacer strips 13-2 are cut to form a mesh structure to effectively bond the first insulating spacer strips 13-1, thereby preventing failure caused by the movement of the first insulating spacer strips 13-1.

The length of each of the second insulating spacer strips 13-2 is determined according to the number of the first insulating spacer strips 13-1 connected by each of the second insulating spacer strips 13-2. In this case, a short second insulating spacer strip 13-2 and a long second insulating spacer strip 13-2 are provided on each side of the rectangular winding coil 11, and the thickness of each of the second insulating spacer strips 13-2 is smaller than the depth of each of the cutouts of the first insulating strips spacer strips 13-1 (or equal to it), guaranteeing the integrity of the channels formed by the first insulating spacer strips 13-1, distant from each other, and thereby preventing the channels from connecting with each other, which leads to the creation of a turbulent flow.

As an ideal solution, it is possible to make the first insulating spacer strips 13-1 and the second insulating spacer strips 13-2 as a single unit. Of course, if the turbulent flow is not taken into account, the first insulating spacer strips 13-1 and the second insulating spacer strips 13-2 can also be stacked directly on top of each other or can be connected to each other by coupling or binding.

Let's turn to fig. 9. In fig. 9 is a cross-sectional view illustrating another connection between the first insulating spacer strips and the second insulating spacer strips.

The first insulating spacer strips 13-1 have a two-layer (or multi-layer) structure, and each of the layers is connected to the others, and the layer of each of the first insulating spacer strips 13-1 intersecting with the second insulating spacer strips 13-2 includes numerous segments, and the space between adjacent segments forms each of the cutouts. Thus, the process of forming cutouts on the first insulating spacer strips 13-1 is omitted, thereby further reducing the manufacturing difficulty.

Let's turn again to fig. 4 and fig. 6. In fig. 4 is an enlarged partial schematic view of part I shown in fig. 3, and in fig. 6 is an enlarged partial schematic view of part II shown in fig. 5.

Between the inner side of the coil 11 of the winding and the annular inner wall of the casing 12 of the coil, third insulating spacer strips 13-3, distant from each other, are vertically provided.

The third insulating spacer strips 13-3 are attached to the annular inner wall of the casing 12 of the coil, and on the side close to this annular inner wall, each of the third insulating spacer strips 13-3 is provided with cut-outs 13-3-1 that direct the liquid, spaced one from one

Thus, after entering the oil inlet chamber of the casing 12 of the coil through the oil inlet 12-1 and flowing through the gaps between the layers of the coil 11 of the winding, the cooling oil can smoothly flow into the oil return chamber through the cutouts 13-3-1, which direct liquid, third insulating spacer strips 13-3.

When the vertical ring high-gradient magnetic separator is operated, the cooling oil - after entering the casing 12 of the coil through the oil inlet 12-1 - can flow between each layer or between some of the layers of the winding coil, so that the contact area between the cooling oil and the coil 11 of the winding is multiplied The cooling oil can be in contact with the winding coil 11 in various positions, which is sufficient for heat exchange, and then the heat-transferring cooling oil flows to the gap oil outlet 12-2, dissipating the heat generated by the winding coil 11, and this ability to quickly dissipate heat can guarantee the maintenance of a lower temperature by the coil 11 of the winding during operation and thus - obtaining an increased voltage of the magnetic field.

Let's turn to fig. 10 and 11. In fig. 10 shows a top view of one more winding coil and one more coil casing, and in fig. 11 is an enlarged partial schematic view of part I shown in fig. 10.

In yet another embodiment, the oil inlet 12-1 and the oil outlet 12-2 of the coil housing 12 are located at the same end of the coil housing 12, and a partition 14 is provided inside the coil housing 12 to separate the inlet port 12-1 for oil from the oil outlet 12-2, and this partition 14 is fixedly connected to the casing 12 of the coil, and a rubber gasket (not shown) is provided on the part of the partition 14 that connects to the coil 11 of the winding.

Unlike the first embodiment, after entering the casing 12 of the coil, the cooling oil flows to the oil outlet 12-2 after the cooling oil has flowed around the coil 11 of the winding, instead of flowing to the outlet 12-2 from both sides of this coil. Therefore, the first insulating spacer strips 13-14 have an asymmetric structure and are arranged with a clockwise inclination relative to the direction of the cooling oil flow, and the other structures are the same as the structures in the first embodiment discussed in the above description.

In order to prevent excess oil or lack of oil that occurs when the cooling oil expands by heating or contracts by cooling, an oil compensating tank 15 is provided in the upper part of the coil housing 12 and communicates with the coil housing 12. The oil compensation tank 15 can compensate the oil at any time according to the different temperatures of the cooling oil in the circulation system to ensure that the circulation system has enough cooling oil.

A breather valve 16 is installed on the compensation tank 15 with oil, which connects to the body of the compensation tank 15 with oil, and this breather valve 16 is made of materials that prevent the ingress of moist air. When the oil is supplied or depleted, the breather valve 16 installed on the oil compensation tank 15 can filter the air entering the oil compensation tank at any time, preventing the water containing air from entering the cooling oil and thereby guaranteeing a coil 11 of the winding having an increased insulating capacity.

The electric wire of the coil 11 of the conductive winding can be a solid copper wire, an aluminum wire or wires made of other materials. The cross-section of the electric wire can be rectangular or have other shapes, and the outer surface of the electric wire can be covered with an insulating material resistant to high temperatures.

The above-described vertical ring high-gradient magnetic separator is only one embodiment, and its specific design is not limited to the above description, and by making special amendments based on the above embodiment and according to actual needs, various embodiments can be obtained. For example, a plurality of layers of the coil 11 of the winding can form one group, with an insulating element provided between two successive groups to form gaps through which cooling oil can flow, or the insulating element can be provided as a comb "combing" one layer and multiple layers.

There are many possible embodiments that will not be illustrated here.

The vertical ring high-gradient magnetic separator proposed in accordance with the invention was described in detail above. The principle and embodiments of this invention are illustrated here with specific examples. The above description of the examples is intended only to facilitate the understanding of the essence of the invention. It should be noted that for a specialist in this field of technology, it is obvious that various modifications and improvements can be made to the invention within the framework of its principle, and these modifications and improvements are also considered to fall within the scope of protection of the invention defined by the claims.

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Claims (10)

1. A vertical ring high-gradient magnetic separator comprising an excitation winding coil and a coil casing (12), wherein the winding coil (11) is immersed in a coolant in the coil casing (12) and has a multilayer structure, with each layer or multiple coil layers between (11) of the windings, an insulating element is provided for the formation of gaps through which the coolant passes. 2. Separator according to claim 1, in which the Insulating element contains the first insulating spacer strips (13-1), which are located between each layer or multiple layers of the coil (11) of the winding, are located with an inclination relative to the direction of flow of the coolant and are distant from each other. 3. Separator according to claim 2, which additionally contains second insulating spacer strips (13-2) connecting the first insulating spacer strips (13-1) 1 located so that they cross the first insulating spacer strips (13-1) 1 inserted into the cutouts of the first insulating spacer strips (13-1). 4. Separator according to claim 3, in which the second Insulating spacer strips (13-2) are located along the direction of the coolant flow, and each of them has a thickness that is less than or equal to the depth of each of the cutouts of the first Insulating spacer strips (13-1) . 5. Separator according to claim 3, in which the first insulating spacer strips (13-1) have a two-layer or multilayer structure, and the layer of each of the first insulating spacer strips (13-1) crossing the second insulating spacer strips (13-2) has a multi-segment structure, and the space between adjacent segments of the layer is formed by each of the cutouts. 6. Separator according to claim 3, in which between the inner side of the coil (11) of the winding 1 and the annular inner wall of the casing (12) of the coil, third insulating spacer strips (13-3) are vertically provided, distant from each other, and on the side, near the annular inner walls, in each of the third insulating spacer strips (13-3) cutouts (13-3-1) are provided that direct the liquid, distant from each other. 7. The separator according to point b, in which the third insulating spacer strips (13-3) are attached to the annular inner wall. 8. Separator according to any one of claims 1-7, in which the inlet opening (12-1) for the liquid and the outlet opening (12-2) for the liquid of the casing (12) of the coil are located at the two ends of the casing (12) of the coil, respectively. 9. Separator according to any one of claims 1-7, in which the inlet (12-1) for the liquid and the outlet (12-2) for the liquid of the casing (12) of the coils are located at the same end of the casing (12). coil, and inside the casing (12) of the coil, a partition (14) is provided to separate the liquid inlet (12-1) from the liquid outlet (12-2). 10. Separator according to any of claims 1-7, in which a compensating tank (15) with a liquid connected to the casing (12) of the coil is installed in the upper part of the casing (12) of the coil, and in the air inlet of the compensating tank (15) with liquid, a moisture-proof breathing valve (16) is installed.