JPH08306549A - Cooling structure of electric apparatus - Google Patents

Abstract

PURPOSE: To provide a spray having a self-cleaning function of automatically discharging foreign matters even if foreign matters are filled up. CONSTITUTION: A spray 1 for spraying a cooling medium to an electric apparatus body is provided with a movable chip 21 and an immovable chip 20 abutting against each other, and a nozzle hole 8 is formed on these chip abutting faces and also the movable chip 21 is movably supported via a spring 19 urging to a direction 27 reverse to a flow of the cooling medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for cooling electric equipment such as stationary induction equipment and semiconductor converters by the latent heat of vaporization of a cooling medium, and more particularly, a structure for preventing clogging of a sprayer which atomizes a liquid cooling medium. Regarding

[0002]

2. Description of the Related Art FIG. 12 is a principle diagram for explaining a cooling structure for electric equipment. The electric device body 11 as a heating element is housed in a sealed tank 12, and the SF is stored in the tank 12.
Insulating gas such as ₆ gas is filled. A condenser 13 communicating with the internal space of the tank 12 is arranged on the side surface of the tank 12, and a liquid reservoir 16 for accumulating the liquefied cooling medium 14 is arranged on the bottom surface of the tank 12. Tank 12
A sprayer 100 is disposed inside the sprayer 100, and a liquid supply pipe 18 is connected to the sprayer 100. A liquid feed pump 17 and a filter 15 for filtering the cooling medium 14 are interposed in the liquid feeding pipe 18, and guide the cooling medium 14 in the direction of arrow 14A of the flow.

In FIG. 12, a sprayer 100 atomizes a cooling medium 14 and sprays it into a tank 12. Cooling medium 14
Becomes a mist 14B having a fine particle size and fills the internal space of the tank 12 together with the insulating gas. The mist-like cooling medium 14 touches the electric device body 11 to remove the latent heat of vaporization, thereby cooling the electric device body 11. The evaporated cooling medium 14 enters the condenser 13 as a stream 14C. The cooling medium 14 cooled and liquefied by the condenser 13 becomes a flow 14D by gravity and enters the liquid reservoir 16.

The cooling medium 14 is used to make the electrical equipment nonflammable.
For example, non-combustible fluorocarbon is used. Fluorocarbon is quite expensive at present, so if the tank 12 is filled with the cooling medium 14 and the entire electric device body 11 is immersed in a liquid, a very expensive device will be obtained. Therefore, as shown in FIG. 12, the amount of the required cooling medium 14 can be reduced by atomizing the cooling medium 14 and spraying it on the electric device body 11 and circulating it. The fog 14B can be suspended in the internal space of the tank 12 for a long time in the form of liquid droplets by setting the particle diameter of the fog 14B to several hundred μm or less. Therefore, the evaporation latent heat is taken from the electric device body 11 which can fill up the mist 14B in every corner of the tank 12.

FIG. 13 is a cross-sectional view showing the detailed structure of a conventional sprayer 100 in the cooling structure for the electric equipment of FIG. A disk-shaped chip 5 is arranged inside the cap 2 via a ring-shaped packing 7. A nozzle hole 8 penetrates through the tip 5 at the center. Chip 5 is core 4
It is pressed down by the core body 3 via.
The core body 3 is formed so as to fit into the cap 2 via the screw portion 9. By rotating the core body 3, the ring-shaped packing 7 is pressed and the core 4 and the chip 5 are pressed.

In FIG. 13, the inside of the sprayer 100 is kept liquid-tight by the packings 6 and 7. FIG.
Although not shown in FIG. 3, the right end of the core body 3 is further connected to the liquid delivery pipe 18 (FIG. 12). The liquid cooling medium flows from the right side of FIG.
It is sent to 0. As a result, the pressure in the inside 10 rises, and the mist 14B of the cooling medium is ejected from the nozzle hole 8 to the left.

[0007]

However, in the conventional atomizer as described above, there is a possibility that the nozzle hole is clogged. That is, since the diameter of the nozzle hole is usually 1 mm or less, it is conceivable that if a foreign matter flows in together with the cooling medium, clogging will occur.
Since the inside of the tank cannot be visually observed at all times, conventionally, a plurality of sprayers were arranged just in case. Further, by constantly monitoring the pressure in the liquid supply pipe and the flow rate of the cooling medium, it was checked whether or not the nozzle hole was clogged.

From the above, the operation of the electric equipment can be continued for the time being, but eventually, the operation is stopped,
It was necessary to open the tank and repair the clogging of the sprayer. Therefore, there is a possibility that the use of the electric device is forced to be stopped and the load side must be out of power. In the configuration of FIG. 12, the filter 15 blocks foreign matter that goes to the sprayer side. However, this filter 15 may eventually become clogged, and the use of electrical equipment must be stopped when the filter 15 is replaced. .

An object of the present invention is to provide a sprayer with a self-cleaning function that can automatically spit out foreign matter even if the foreign matter is clogged.

[0010]

According to the present invention, in order to achieve the above object, a liquid cooling medium is passed through a nozzle hole built in a tank accommodating an electric equipment main body together with an insulating gas to form a mist. Atomizer, a condenser for liquefying the cooling medium vaporized by the heat of the electric device body, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and the cooling medium accumulated in the liquid reservoir is sent to the atomizer. A liquid feed pump configured to cool an electric device body by latent heat of vaporization of a cooling medium, which includes a movable tip and a fixed tip formed by a sprayer butting each other, and a nozzle hole is formed at a butting surface of the tip. In addition, it is preferable that the movable chip is movably supported by a spring that urges in the direction opposite to the flow of the cooling medium.

Alternatively, a sprayer for atomizing a liquid cooling medium into a tank containing an electric device body together with an insulating gas through a built-in nozzle hole, and a condenser for liquefying the cooling medium vaporized by the heat of the electric device body Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In the cooling device, the atomizer may include a movable needle that enters the nozzle hole, and the movable needle may be movably supported by a spring that biases the cooling medium in the opposite direction.

Alternatively, a sprayer for atomizing a liquid cooling medium through a built-in nozzle hole into a tank accommodating an electric device body together with an insulating gas, and a condensing liquid for liquefying the cooling medium vaporized by the heat of the electric device body Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In what is cooled, it is assumed that the sprayer has a tip penetrating the nozzle hole, the tip is provided with a plurality of notches radially extending from the peripheral portion of the nozzle hole, and the tip is formed of an elastic body. Good.

Alternatively, a sprayer for atomizing a liquid cooling medium through a nozzle hole built in a tank accommodating an electric equipment body together with an insulating gas and a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment body Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In what is to be cooled, the atomizer is provided with a tip penetrating the nozzle hole, the tip is provided with a plurality of notches radially extending from the peripheral portion of the nozzle hole, and the tip is formed of a shape memory alloy. May be

Alternatively, a sprayer for atomizing a liquid cooling medium through a built-in nozzle hole into a tank accommodating an electric device body together with an insulating gas, and a condensation for liquefying the cooling medium vaporized by the heat of the electric device body Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In the thing to cool, the atomizer removes the cooling medium from the liquid sending pump through the internal opening hole, and the atomizing unit that atomizes the cooling medium sent out from this contaminant removing section through the nozzle hole and atomizes the cooling medium. A movable chip and a fixed chip in which the foreign matter removing portions are butted against each other, and the opening hole is formed at the butted surfaces of these chips. Both movably supported via a spring movable tip is urged in the opposite direction of flow of the cooling medium, the foreign matter removing portion includes a discharge port communicating from the interior to the exterior,
With a communication hole communicating from the inside to the sprayer, when the movable chip moves in the direction of the flow of the cooling medium, the discharge hole is closed and the communication hole communicates, and the movable chip moves in the opposite direction of the flow of the cooling medium. It may be assumed that the discharge holes are communicated with each other and the communication holes are closed when moved.

[0015]

According to the structure of the present invention, the sprayer is provided with the movable tip and the fixed tip which are butted against each other, and the nozzle hole is formed at the butted surface of these tips. A movable tip is movably supported by a spring that biases the cooling medium in the opposite direction. When there is no flow in the cooling medium, the movable chip is pulled by the biasing force of the spring, and the abutting surfaces of the movable chip and the fixed chip are separated from each other. On the other hand, when the cooling medium has a predetermined flow rate, the movable chip receives a force in the direction of the flow by the cooling medium. Therefore, the movable tip moves against the urging force of the spring in the direction of the flow of the cooling medium, and the movable tip and the fixed tip are brought into abutment with each other. If the nozzle hole is not clogged and the cooling medium is flowing at a predetermined flow rate or more in the sprayer, the nozzle hole maintains the regular shape at the abutting boundary surface between the movable tip and the fixed tip. When the nozzle hole is clogged, the flow of the cooling medium flowing into the atomizer is stopped, so that the movable tip is moved by the biasing force of the spring. As a result, the nozzle hole is wide open, and the nozzle is deformed from the regular shape. As a result, the foreign matter that causes the clogging is peeled off, and the flow of the cooling medium is secured again, so that the clogged foreign matter is discharged from the peripheral portion of the nozzle hole. After that, when the cooling medium reaches a predetermined flow rate, the nozzle hole returns to the regular shape. That is, the sprayer has a self-cleaning function of automatically removing foreign matter.

Further, the atomizer is provided with a movable needle that enters the nozzle hole, and the movable needle is movably supported by a spring that biases in the opposite direction of the cooling medium flow. When there is no flow in the cooling medium, the movable needle is pulled by the biasing force of the spring, so that the movable needle separates from the nozzle hole. On the other hand, when the cooling medium has a predetermined flow rate, the movable needle receives a force in the direction of the flow by the cooling medium. Therefore, the movable needle moves in the direction of the flow of the cooling medium against the biasing force of the spring, and the movable needle enters the nozzle hole. If the nozzle hole is not clogged and the cooling medium flows in the sprayer at a predetermined flow rate or more, the movable needle enters the nozzle hole, and the nozzle hole having a regular shape is secured. When the nozzle hole is clogged, the flow of the cooling medium flowing into the atomizer is stopped, so that the movable needle moves by the biasing force of the spring. Therefore, the movable needle comes off from the nozzle hole, and the nozzle hole collapses from the regular shape. As a result, the foreign matter that causes the clogging is peeled off, and the flow of the cooling medium is secured again, so that the clogged foreign matter is discharged from the peripheral portion of the nozzle hole. After that, when the cooling medium reaches a predetermined flow rate, the nozzle hole returns to the regular shape. That is, the sprayer has a self-cleaning function of automatically removing foreign matter.

The atomizer also includes a tip penetrating the nozzle hole. The chip is provided with a plurality of cuts radially extending from the peripheral portion of the nozzle hole, and the chip is formed of an elastic body. When the nozzle hole is clogged, the flow of the cooling medium flowing into the atomizer is stopped, so that the pressure in the atomizer becomes high. Therefore, the peripheral edge of the nozzle hole is rolled up at the notch, and the nozzle hole is deformed from its regular shape. As a result, the foreign matter that causes the clogging is peeled off, and the flow of the cooling medium is secured again, so that the clogged foreign matter is discharged from the peripheral portion of the nozzle hole. After that, when the cooling medium reaches a predetermined flow rate, the nozzle hole returns to the regular shape. That is, the sprayer has a self-cleaning function of automatically removing foreign matter.

Further, in such a structure, the material of the chip is a shape memory alloy instead of the elastic body. When there is no flow of the cooling medium during operation, heat dissipation from the chip itself also disappears, so the temperature of the chip rises. Therefore, it is stored in the chip so that the peripheral portion of the nozzle hole is raised at the notch due to the temperature rise. On the other hand, when the cooling medium has a predetermined flow rate, the chip itself is also radiated, and the temperature of the chip drops. The chip is memorized so that the nozzle hole has a regular shape at the temperature when the cooling medium is flowing normally. When the nozzle hole is clogged, the flow of the cooling medium flowing into the atomizer is stopped, so that the peripheral edge of the nozzle hole rises up at the notch, and the nozzle hole collapses from the regular shape. As a result, the foreign matter that causes the clogging is peeled off, and the flow of the cooling medium is secured again, so that the clogged foreign matter is discharged from the peripheral portion of the nozzle hole. After that, when the cooling medium reaches a predetermined flow rate, the nozzle hole returns to the regular shape. That is, the sprayer has a self-cleaning function of automatically removing foreign matter.

Further, a foreign matter removing section for the atomizer to send the cooling medium from the liquid feed pump through the internal opening hole, and a spraying section for passing the cooling medium sent from the foreign matter removing section through the nozzle hole to form mist. It is composed of The foreign matter removing portion is provided with a movable chip and a fixed chip that are butted against each other, and the opening hole is formed at the butted surfaces of these chips, and the movable chip is urged through a spring that biases in the opposite direction of the flow of the cooling medium. It is movably supported.
The foreign matter removing unit includes a discharge hole that communicates from the inside to the outside and a communication hole that communicates from the inside to the sprayer.When the movable chip moves in the direction of the flow of the cooling medium, the discharge hole is closed and the communication hole is When the movable chips are communicated with each other and the movable chip moves in the direction opposite to the flow of the cooling medium, the discharge holes communicate with each other and the communication holes are closed. When there is no clogging in the opening of the foreign matter removing part and there is a certain flow rate of the cooling medium inside, the movable chip receives a force in the direction of the flow by the cooling medium, so the movable chip is biased by the spring. The movable chip and the fixed chip are abutted against each other in the direction of the flow of the cooling medium. At that time, since the discharge hole is closed and the communication hole is in communication, the cooling medium is sent to the spraying section and atomized through the nozzle hole. On the other hand, when the opening hole of the foreign matter removing portion is clogged, the flow of the cooling medium flowing into the foreign matter removing portion is stopped, so that the movable tip moves by the biasing force of the spring. As a result, the opening hole is greatly opened, and the shape is broken from the regular shape. As a result, the discharge holes communicate with each other and the communication holes are closed, so that the flow of the cooling medium does not temporarily go to the spray section side but flows to the tank side via the discharge holes. Therefore, the clogged foreign matter is discharged to the tank side through the discharge hole. When there is no foreign matter,
Since the cooling medium reaches a predetermined flow rate, the movable chip moves in the direction of the flow of the cooling medium again, so that the discharge hole is closed and the communication hole communicates, and the opening hole returns to its original regular shape. That is, the atomizer is provided with a self-cleaning function in which foreign matter is automatically removed by the foreign matter removing unit.

[0020]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a sectional view showing a detailed configuration of a sprayer in a cooling structure for an electric device according to an embodiment of the present invention. The sprayer 1 includes a movable tip 21 and a fixed tip 20 which are arranged inside the cap 2 via a ring-shaped packing 7. The movable tip 21 is supported in the cap 2 so as to be movable in the left-right direction via a compressible spring 19 biased in the direction of the arrow 27. On the other hand, the fixed tip 20 is pressed to the left by the core body 3.

FIG. 2A is a sectional view taken along line AA of FIG.
(B) is a BB sectional view of FIG. 1. In FIG. 2 (A), the movable tip 21 and the fixed tip 20 are divided through a V-shaped boundary surface 31, and the nozzle hole 8 is secured at the center thereof. In FIG. 2B, a spring 19 is arranged below the movable tip 21 to urge the movable tip 21.

The other structure of FIG. 1 is the same as the conventional structure described in FIG. The same portions are denoted by the same reference numerals and repeated detailed description is omitted. FIG. 1 shows a state in which the nozzle holes 8 are not clogged and the cooling medium flow 14A has a predetermined flow rate. Due to the flow 14A, the movable tip 21 receives a force to the left. Therefore, the movable tip 21 hits the inner wall surface of the cap 2 against the urging force of the spring 19, and the nozzle hole 8
Maintains a regular round shape as shown in FIG.

FIG. 3 is a sectional view showing a state in which the flow of the cooling medium is stopped in the sprayer 1 of FIG. Since there is nothing to press the movable tip 21, the movable tip 21 is moved in the direction of the arrow 27 by the urging force of the spring 19, and the shape of the nozzle hole 8 is collapsed. If the nozzle hole 8 is clogged with foreign matter and the flow of the cooling medium is stopped, the state of FIG. 3 is temporarily obtained. As a result, the flow 14A of the cooling medium is secured again, so that the foreign matter is discharged to the left, and the normal state as shown in FIG. 1 is restored.

That is, the configuration of FIG. 1 has a self-cleaning function that foreign matter is automatically removed even if the nozzle hole 8 is clogged. Therefore, it is not necessary to monitor the flow rate and pressure of the cooling medium, and it is not necessary to open the tank and restore the sprayer 1. In addition, the spring 1 in FIG.
Although 9 is compressible, it may be used as a tension spring to apply a biasing force for pulling the movable tip 21 to the right from the right side of the cap 2. Further, the boundary surface 31 in FIG. 2 does not necessarily have to be a V-shape, but may be a linear shape. Further, a plurality of movable chips may be provided by forming the boundary surface into a cross shape.

FIG. 4 is a sectional view showing the detailed structure of the sprayer in the cooling structure for electric equipment according to another embodiment of the present invention. The sprayer 1 has a disc shape inside the cap 2, and
A chip 23 having a nozzle hole 8 in the center is provided. The core 22 fitted in the threaded portion 24 of the cap 2 further supports the core body 3 fitted in the threaded portion 9. Core 22
Is provided with a guide 22A for the movable needle 26 while pressing the tip 23. The left end portion of the movable needle 26 enters the inside of the nozzle hole 8 with a slight gap. Further, the movable needle 26 extends rightward and is formed into a cylindrical shape,
The protrusions 26A, 26B, and 26C are provided. Guide 2
A compressible spring 25 that urges in the direction of arrow 27 is interposed between 2A and the protrusion 26C. The protrusion 26
Each of A, 26B, 26C and the guide 22A has a ring-shaped outer shape, but has a sufficient clearance inside so as not to hinder the flow of the cooling medium to the left. The protrusions 26A and 26B serve as stoppers that contact the guide 22A, and the protrusion 26C serves to press the spring 25. Further, the guide 22A supports the movable needle 26 so as to be movable in the left-right direction. Other configurations are the same as those in FIG.

FIG. 5 is a sectional view showing a state in which the flow of the cooling medium is stopped in the sprayer 1 of FIG. Since there is nothing to press the movable needle 26, the movable needle 26 is moved in the direction of the arrow 27 by the urging force of the spring 25, and the shape of the nozzle hole 8 collapses and opens widely. If the nozzle hole 8 is clogged with foreign matter and the flow of the cooling medium is stopped,
The state of FIG. 5 is temporarily entered. As a result, the flow 14A of the cooling medium is secured again, so that the foreign matter is discharged to the left and returns to the normal state as shown in FIG.

That is, the configuration shown in FIG. 4 has a self-cleaning function in which foreign matter is automatically removed even if the nozzle hole 8 is clogged. Therefore, it is not necessary to monitor the flow rate or pressure of the cooling medium, and it is not necessary to open the tank and restore the sprayer 1. The spring 2 in FIG.
No. 5 is compressible, but this is used as a tension spring, and the core 2
A biasing force for pulling the movable needle 26 to the right may be applied from the right side of 2.

FIG. 6 is a sectional view showing the detailed construction of the atomizer in the cooling structure for electric equipment according to a further different embodiment of the present invention. The sprayer 1 is provided with a disk-shaped tip 28 having a nozzle hole 8 at the center in the cap 2. The core body 3 fitted in the threaded portion 9 of the cap 2 presses the chip 28. The tip 28 may be an elastic body or a shape memory alloy, as will be described later.

FIG. 7 is a side view showing only the chip 28 shown in FIG. It is the figure which looked at the right side from the left end of FIG. Four cuts 29 are radially provided from the peripheral portion of the nozzle hole 8 of the tip 28. Returning to FIG.
The other configuration is similar to that of the conventional device shown in FIG. In the state of FIG. 6, the nozzle hole 8 is not clogged,
The flow of the cooling medium is at a predetermined flow rate.

FIG. 8 is a sectional view showing the state of the tip 28 when the flow of the cooling medium is stopped in the sprayer 1 of FIG. When the tip 28 is elastic around the nozzle hole 8 and the shape of the nozzle hole 8 is distorted in FIG.
When foreign matter is clogged with foreign matter and the flow of the cooling medium is stopped, the pressure in the inside 10 (FIG. 6) rises. Since the notch 29 (FIG. 7) is formed in the tip 28, the tip 28 is deformed by the pressure from the right side, and the tip 28 becomes as shown in FIG. That is, the peripheral portion of the nozzle hole 8 is rolled up, and the hole diameter is equivalently increased. Thereby, the flow of the cooling medium 14A
Is secured, the foreign matter is also discharged to the left to reduce the pressure, and the normal state as shown in FIG. 6 is returned to 7.

That is, the configuration shown in FIG. 6 has a self-cleaning function in which foreign matter is automatically removed even if the nozzle hole 8 is clogged. Therefore, it is not necessary to monitor the flow rate or pressure of the cooling medium, and it is not necessary to open the tank and restore the sprayer 1. Further, in FIG. 8, the tip 28 may be made of a shape memory alloy. When the nozzle hole 8 is clogged with foreign matter and the flow of the cooling medium is stopped, the tip 28
Will not be dissipated. The tip 28 is stored in the tip 28 so that the peripheral portion of the nozzle hole 8 has a shape that bulges up as shown in FIG. That is, the peripheral portion of the nozzle hole 8 is rolled up, and the hole diameter is equivalently increased. Thereby, the flow of the cooling medium 14
Since A is secured, foreign matter is also exhaled to the left. When the cooling medium flows at a predetermined flow rate, the heat of the chip 28 itself is dissipated and the temperature of the chip 28 drops. On the other hand, the tip 28 is stored so that the nozzle hole 8 has a regular shape at the temperature when the cooling medium flows. As a result, the flow of the cooling medium is secured, and the nozzle hole 8 is also shown in FIG.
It returns to the normal state like.

That is, the structure shown in FIG. 6 has a self-cleaning function in which the clogging of the nozzle hole 8 is automatically eliminated even if the tip 28 is made of a shape memory alloy.
Therefore, it is not necessary to monitor the flow rate and pressure of the cooling medium, and it is not necessary to open the tank and restore the sprayer 1. In addition, although the number of notches 29 in FIG. 7 is four,
The number of cuts may be three or more for the tip 28 to be rolled up.

FIG. 9 is a cross-sectional view of essential parts showing a cooling structure for electric equipment according to a further different embodiment of the present invention. The sprayer 32 is arranged on the inner side 12A of the tank 12 and is fixed to the tank 12 via a mounting flange 39.
The sprayer 32 includes a spraying unit 34 and a foreign matter removing unit 33, and the foreign matter removing unit 33 communicates with the liquid delivery pipe 18. The spray section 34 has a plurality of nozzle holes 80 attached to the liquid guide tube 35. The cooling medium sent from the foreign matter removing unit 33 is supplied to the nozzle hole 80 through the liquid guide hole 36, and the mist 14
B is injected.

FIG. 10 is a sectional view showing the detailed structure of the foreign matter removing unit 33 of FIG. The right end of the foreign matter removing portion 33 is connected to the mounting flange 39, and the left end of the foreign matter removing portion 33 is connected to the liquid guide tube 35. The cap 2 is provided with a mortar-shaped flow hole 40 at the left end, and a discharge hole 37 is provided at the bottom. A stopper 41 is fixed to the left end of the movable tip 21 via a support rod 42.
The plug 41 has a shape that fits into the flow hole 40. Others are exactly the same as the structure of the sprayer 1 of FIG. 1, and the name of the nozzle hole 8 is only changed to the opening hole 38. Therefore, the movable chip 21 and the fixed chip 2
The operation of 0, the spring 19 and the like is the same as in FIG.

That is, in FIG. 10, the foreign matter removing unit 3
When the opening hole 38 of No. 3 is not clogged and the internal cooling medium has a flow rate of a predetermined flow rate, the movable chip 21 receives a force in the direction of the flow (14A direction) by the cooling medium. Moves in the left direction against the biasing force of the spring 19 and the movable tip 21 and the fixed tip 20 are brought into abutment with each other. At this time, since the discharge hole 37 is closed and the communication hole 40 communicates with the spray section side, the cooling medium is sent to the spray section and atomized.

FIG. 11 is a sectional view showing a state in which the flow of the cooling medium is stopped in the sprayer 1 of FIG. When the opening hole 38 of the foreign matter removing portion 33 is clogged, there is nothing to press the movable chip 21. To that end, the spring 1
The movable chip 21 is moved in the direction of arrow 27 by the biasing force of 9, and the shape of the opening hole 38 is deformed. If the opening hole 38 is clogged with foreign matter and the flow of the cooling medium is stopped, the state shown in FIG. 11 is temporarily obtained. The foreign matter is peeled off by the deformation of the opening hole 38, and the foreign matter is removed by the arrow 3 as the cooling medium flows.
7A, passes through the discharge hole 37, and is discharged to the inner side 12A (FIG. 9) of the tank. Then, the foreign matter removing unit 33 returns to the normal state as shown in FIG. That is, all the foreign substances that cause the clogging of the spray unit 34 are automatically discharged from the foreign substance removing unit. for that reason,
The spraying section 34 may have any shape, and the sprayer 1 having the conventional configuration may be used.
00 (FIG. 13) may be used. Even if the spraying section 34 has a plurality of nozzle holes 80, none of the nozzle holes 80 is clogged. Therefore, it is not necessary to provide each nozzle hole 80 with a self-cleaning function.

[0037]

As described above, the present invention is provided with the movable tip and the fixed tip in which the sprayers are butted against each other, and the nozzle hole is formed at the butted surface of these tips. A movable tip is movably supported by a spring that biases the cooling medium in the opposite direction. Therefore, when the nozzle hole is clogged, the nozzle hole automatically opens. Therefore, the foreign matter that has caused the clogging is discharged, and the original normal state is restored. That is, since the sprayer has the self-cleaning function, the following effects can be obtained.

The spray stop due to clogging is eliminated, and local heating of electric equipment due to non-spray is prevented. Since there is no clogging, there is no need to arrange a spare sprayer or a double sprayer, and the cost can be reduced.
Further, it is no longer necessary to install a filter in the liquid feeding pipe.

Since clogging is automatically prevented, operation stop and repair of equipment due to clogging are not required and maintenance is free. From the above, the reliability of the electric device is improved. In addition, the atomizer includes a movable needle having a nozzle hole, and the movable needle is movably supported by a spring biasing the cooling medium in the opposite direction. Therefore, when the nozzle hole is clogged, the nozzle hole automatically opens. Therefore, the foreign matter that has caused the clogging is discharged, and the original normal state is restored. That is, since the sprayer has the self-cleaning function, the same effects as those described above can be obtained.

Further, the atomizer has a tip penetrating the nozzle hole. The chip is provided with a plurality of cuts radially extending from the peripheral portion of the nozzle hole, and the chip is formed of an elastic body. Therefore, when the nozzle hole is clogged, the nozzle hole automatically opens. Therefore,
The foreign matter that was causing the clogging is exhaled, and
Return to the original normal state. That is, since the sprayer has the self-cleaning function, the same effect as above can be obtained in this case as well.

Further, in such a structure, the chip material is a shape memory alloy instead of the elastic body. Therefore, when the nozzle hole is clogged, the nozzle hole automatically opens. Therefore, the foreign matter that has caused the clogging is discharged, and the original normal state is restored. That is, since the sprayer has the self-cleaning function, the same effect as above can be obtained in this case as well.

Further, a foreign matter removing section for the sprayer to send the cooling medium from the liquid feed pump through the internal opening hole, and a spraying section for passing the cooling medium sent from the foreign matter removing section through the nozzle hole to form mist. It is composed of As a result, the foreign matter that has caused the clogging of the sprayer is automatically discharged from the foreign matter removing unit. To that end, the spray section may be of any shape, and may be a sprayer of conventional construction. Further, even if the spraying section has a plurality of nozzle holes, none of the nozzle holes will be clogged. Therefore, it is not necessary to provide each nozzle hole with a self-cleaning function.
Therefore, it is particularly advantageous when the sprayer has a plurality of nozzle holes, and a significant cost reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a detailed configuration of a sprayer in a cooling structure for an electric device according to an embodiment of the present invention.

2A is a sectional view taken along line AA of FIG. 1, and FIG. 2B is a sectional view taken along line BB of FIG.

FIG. 3 is a cross-sectional view showing a state when the flow of the cooling medium is stopped in the sprayer of FIG.

FIG. 4 is a sectional view showing a detailed configuration of a sprayer in a cooling structure for an electric device according to another embodiment of the present invention.

5 is a cross-sectional view showing a state when the flow of the cooling medium is stopped in the sprayer of FIG.

FIG. 6 is a cross-sectional view showing a detailed configuration of a sprayer in a cooling structure for an electric device according to still another embodiment of the present invention.

FIG. 7 is a side view showing only the chip shown in FIG.

8 is a sectional view showing a state of the tip when the flow of the cooling medium is stopped in the sprayer of FIG.

FIG. 9 is a sectional view showing a detailed configuration of a sprayer in a cooling structure for an electric device according to still another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a detailed configuration of a foreign matter removing unit in FIG. 9.

11 is a cross-sectional view showing a state in which the flow of the cooling medium is stopped in the foreign matter removing unit of FIG.

FIG. 12 is a principle diagram illustrating a cooling structure of an electric device.

13 is a cross-sectional view showing the detailed configuration of a conventional sprayer in the cooling structure for the electric device of FIG. 12.

[Explanation of symbols]

1, 32: atomizer, 12: tank, 18: liquid supply pipe, 2
0: Fixed tip, 21: Movable tip, 23, 28: Tip, 19, 25: Spring, 26: Movable needle, 8, 80: Nozzle hole, 31: Boundary surface, 29: Notch, 37: Discharge hole,
38: Opening hole, 33: Foreign matter removing part, 34: Spraying part, 4
0: Distribution hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazumasa Ishizu, 1-4-1, Mei Station, Nakamura-ku, Nagoya, Aichi Prefecture Tokai Passenger Railway Co., Ltd. (72) Inventor, Fushio Yokonishi Nakamura-ku, Nagoya-shi, Aichi Station 1-4-1 Tokai Passenger Railway Co., Ltd. (72) Inventor Kenji Sato Mei 1-4-1 Station, Nakamura-ku, Nagoya, Aichi Prefecture Tokai Passenger Railway Co., Ltd. (72) Inventor Nakagami Yoshitake Kanagawa No. 1-1 Tanabe-Shinden, Kawasaki-ku, Kawasaki-shi, Japan Fuji Electric Co., Ltd. (72) Inventor Koji Iwamura 1-1, Tanabe-Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Fuji Electric Co., Ltd. (72) Inventor Yasuhiro Kurizumi 117-10 Warara, Yotsukaido, Chiba Prefecture (72) Inventor Toyofumi Kanamaru 5-1-15 Sagamihara, Sagamihara City, Kanagawa Prefecture

Claims (5)

[Claims] 1. A sprayer for atomizing a liquid cooling medium through a nozzle hole built into a tank accommodating an electric device body together with an insulating gas to condense the cooling medium vaporized by the heat of the electric device body. Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In the thing to be cooled, a sprayer has a movable tip and a fixed tip that are butted against each other, and a nozzle hole is formed at the abutting surface of these tips, and a spring that urges the movable tip in the direction opposite to the flow of the cooling medium. A cooling structure for an electric device, which is movably supported through the cooling structure. 2. A sprayer for atomizing a liquid cooling medium through a built-in nozzle hole into a tank accommodating an electric equipment body together with an insulating gas, and a condensation for liquefying the cooling medium vaporized by the heat of the electric equipment body. Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In what is cooled, an atomizer is provided with a movable needle that enters a nozzle hole, and the movable needle is movably supported by a spring that biases in the opposite direction of the flow of the cooling medium. Cooling structure. 3. A sprayer for atomizing a liquid cooling medium through a nozzle hole built in a tank accommodating an electric equipment body together with an insulating gas, and a condensation for liquefying the cooling medium vaporized by the heat of the electric equipment body. Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In what is cooled, the sprayer comprises a tip penetrating the nozzle hole, and the tip is provided with a plurality of notches radially extending from the peripheral portion of the nozzle hole, and the tip is formed of an elastic body, Cooling structure for electrical equipment. 4. A sprayer for atomizing a liquid cooling medium into a tank containing an electric equipment body together with an insulating gas through a built-in nozzle hole, and a condenser for liquefying the cooling medium vaporized by the heat of the electric equipment body. Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In what is cooled, the sprayer has a tip penetrating the nozzle hole, the tip is provided with a plurality of notches radially extending from the peripheral portion of the nozzle hole, and the tip is formed of a shape memory alloy. Cooling structure for electrical equipment. 5. A sprayer for atomizing a liquid cooling medium through a nozzle hole built in a tank accommodating an electric equipment body together with an insulating gas, and a condensing liquid for liquefying the cooling medium vaporized by the heat of the electric equipment body. Device, a liquid reservoir arranged at the bottom of the tank for storing the liquefied cooling medium, and a liquid feed pump for sending the cooling medium accumulated in the liquid reservoir to the sprayer. In the thing to cool, the atomizer removes the cooling medium from the liquid sending pump through the internal opening hole, and the atomizing unit that atomizes the cooling medium sent out from this contaminant removing section through the nozzle hole and atomizes the cooling medium. And a movable chip and a fixed chip in which the foreign matter removing portions are butted against each other, and the opening hole is formed in the butted surface of these chips. The movable tip is movably supported via a spring that biases in the opposite direction of the flow of the cooling medium, and the foreign matter removing portion includes a discharge hole that communicates from the inside to the outside, and a communication hole that communicates from the inside to the sprayer. When the movable chip moves in the direction of the flow of the cooling medium, the discharge hole is closed and the communication hole communicates, and when the movable chip moves in the opposite direction of the flow of the cooling medium, the discharge hole communicates and the communication hole. A cooling structure for electric equipment, which is characterized by being closed.