JP6752550B2 - Static guidance device - Google Patents

Description

Examples relate to stationary induction devices.

Some static induction devices are equipped with a container and a cooler. The container is the one in which the main body of the device is stored. The container is filled with a refrigerant, and the main body of the device is cooled by the refrigerant in the container. The cooler cools the refrigerant, and the container and the cooler are connected via a circulation path. A pump is interposed in this circulation path, and the refrigerant circulates between the container and the cooler along the circulation path in the operating state of the pump.

Japanese Unexamined Patent Publication No. 2001-102226

In the case of the conventional static induction device, the pump acts as a resistance to the flow of the refrigerant when the operation of the pump is stopped. Therefore, the smooth circulation of the refrigerant is hindered, so that the required self-cooling capacity may not be obtained.

The static induction device of the embodiment includes a container filled with a refrigerant, a device body housed in the container and cooled by the refrigerant, a cooler for cooling the refrigerant, the container, and the static induction device. In the operating state, the first pipe that connects the coolers horizontally, the second pipe that connects vertically to the pipe in the middle of the pipe, and the second pipe and the container are connected to each other. A pump that circulates the refrigerant between the container and the cooler, a third pipe that directly connects the pump and the container, and the first pipe and the second pipe in the first pipe. It is provided with a valve body that is located closer to the container side than the connection portion of the above and opens or closes the first pipe, and is provided between the container and the cooler from the cooler side to the first. The circulation path is a path that circulates through the first pipe, the second pipe, the pump, and the third pipe to the connection portion between the first pipe and the second pipe, and the container and the cooler. When the path that circulates through the first pipe is used as the bypass circulation path, the valve body closes the first pipe in the operating state of the pump to open the circulation path. By passing through and circulating the refrigerant between the container and the cooler and opening the first pipe by the valve body in the stopped operation state of the pump, the valve body passes through the bypass circulation path and passes through the container and the cooler. The refrigerant is circulated between the coolers.

The figure which shows Example 1 (the figure which shows a transformer in a strong cooling state) Fig. 1 equivalent diagram showing the transformer in a self-cooled state FIG. 1 corresponding diagram showing the second embodiment Fig. 2 equivalent diagram FIG. 1 corresponding diagram showing the third embodiment Fig. 2 equivalent diagram FIG. 1 corresponding diagram showing Example 4

In this embodiment, the present invention is applied to a large liquid-cooled transformer used in a power system or a power receiving / transforming system. The tank 1 of FIG. 1 is filled with mineral oil as insulating oil, and the transformer main body 2 is housed in the tank 1. The transformer main body 2 has an iron core and windings, and is cooled by exchanging heat with the insulating oil in the tank 1. This insulating oil is heated by exchanging heat with the transformer main body 2, and convects from the bottom to the top according to the heating. The tank 1 corresponds to a container, the transformer main body 2 corresponds to a device main body, and the insulating oil corresponds to a refrigerant.

As shown in FIG. 1, an oil outlet 3 is fixed to the tank 1. The oil outlet 3 is arranged at the upper end of the tank 1, and one end of a horizontal upper pipe 4 is connected to the oil outlet 3. A cooler 5 is connected to the other end of the upper pipe 4. Insulating oil is supplied from the inside of the tank 1 through the oil outlet 3 and the upper pipe 4, and the insulating oil is cooled by exchanging heat between the outside air and the insulating oil.

As shown in FIG. 1, one end of the middle pipe 6 is connected to the cooler 5. The middle pipe 6 is a horizontal one arranged at a lower position than the upper pipe 4, and the upper end portion of the vertical lower pipe 7 on the inlet side is connected to the middle part of the middle pipe 6 in the horizontal direction. The lower end of the inlet side lower pipe 7 is connected to the circulation pump 8. The circulation pump 8 corresponds to a pump, and has a casing 9, a pump motor 10, and an impeller 11.

As shown in FIG. 1, the casing 9 of the circulation pump 8 has a spiral shape having an inlet and an outlet, and the lower end of the inlet-side lower pipe 7 is connected to the inlet of the casing 9. The pump motor 10 of the circulation pump 8 is fixed to the casing 9 and is connected to the power supply equipment via wiring. The pump motor 10 is continuously supplied with drive power from the power supply equipment, and the rotating shaft of the pump motor 10 rotates in a constant direction at a constant speed while the drive power is supplied.

As shown in FIG. 1, the impeller 11 of the circulation pump 8 is of a centrifugal type connected to the rotating shaft of the pump motor 10 and is housed in the casing 9. The impeller 11 rotates integrally with the rotating shaft of the pump motor 10, and in the operating state of the circulation pump 8 in which the drive power is supplied to the pump motor 10, the inside of the cooler 5 responds to the rotation of the impeller 11. Is sucked into the casing 9 from the middle pipe 6 through the lower pipe 7 on the inlet side and the inlet of the casing 9, and the insulating oil in the casing 9 is discharged from the outlet of the casing 9.

As shown in FIG. 1, an oil inlet 12 is fixed to the tank 1. The oil inlet 12 is arranged at the lower end of the tank 1, and is arranged at a lower place than the oil outlet 3. One end of a horizontal outlet-side lower pipe 13 is connected to the oil inlet 12. The other end of the outlet side lower pipe 13 is connected to the outlet of the casing 9, and in the operating state of the circulation pump 8, the insulating oil discharged from the outlet of the casing 9 passes through the oil inlet 12 from the outlet side lower pipe 13 to the tank. It is injected into 1. That is, the circulation pump 8 circulates insulating oil between the tank 1, the upper pipe 4, the cooler 5, a part of the middle pipe 6, the inlet side lower pipe 7, and the outlet side lower pipe 13. Reference numeral 14 is a circulation path including a part of the upper pipe 4 and the middle pipe 6, the inlet side lower pipe 7 and the outlet side lower pipe 13, and the circulation pump 8 is interposed in the circulation path 14.

As shown in FIG. 1, an oil inlet 15 is joined to the tank 1. The oil inlet 15 is arranged at a height between the oil outlet 3 and the oil inlet 12, and the other end of the middle pipe 6 is connected to the oil inlet 15. A middle valve 16 is mounted in the middle pipe 6. The valve 16 is rotatable between a closed state (see FIG. 1) and a horizontal open state (see FIG. 2) about a horizontal shaft 17, and is an upper end portion of the lower pipe 7 on the inlet side. It is located on the downstream side of the flow of insulating oil. Of these, the valve 16 is urged from the closed state to the open state by the spring force of the open spring. The oil inlet 15 is closed so that the insulating oil cannot pass through in the closed state, and the oil inlet 15 is closed in the open state. The insulating oil is opened so that it can pass through.

As shown in FIG. 1, a lower valve 18 is mounted in the lower pipe 7 on the inlet side. The lower valve 18 is rotatable between an open state (see FIG. 1) perpendicular to the horizontal axis 19 and a horizontally closed state (see FIG. 2), and the lower pipe 7 on the inlet side in the open state. Is opened so that the insulating oil can pass through, and the lower pipe 7 on the inlet side is closed so that the insulating oil cannot pass through in the closed state. The lower valve 18 is connected to the middle valve 16 via a linear connecting member 20, and is in an open state when the middle valve 16 is closed, and is in a closed state when the middle valve 16 is open.

In a normal state in which the circulation pump 8 is not out of order, drive power is supplied from the power supply equipment to the circulation pump 8. The spring force of the release spring is set smaller than the downward suction force (wind force) acting on the lower valve 18 from the circulation pump 8 in the operating state of the circulation pump 8, and is set to be smaller in the normal state as shown in FIG. In addition, the lower valve 18 is stopped in the open state in response to being sucked downward by the suction force of the circulation pump 8 against the spring force of the release spring. In the open state of the lower valve 18, the middle valve 16 is closed in conjunction with the lower valve 18, and the insulating oil is in the tank 1, the upper pipe 4, the cooler 5, a part of the middle pipe 6, and the lower pipe 7 on the inlet side. Forcibly circulates between the outlet side lower pipes 13.

If the circulation pump 8 fails or the circulation pump 8 is maintained and inspected, the power supply equipment is turned off. In the off state of this power supply equipment, the drive power supply is cut off from the circulation pump 8, and the suction force acting on the lower valve 18 from the circulation pump 8 disappears. In the extinguished state of the suction force, as shown in FIG. 2, the middle valve 16 is changed from the closed state to the open state by the spring force of the opening spring, the lower valve 18 is closed in conjunction with the middle valve 16, and the cooler 5 The insulating oil inside enters the tank 1 from the middle pipe 6 through the oil inlet 15. That is, when the circulation pump 8 fails or the circulation pump 8 is maintained and inspected, insulating oil circulates between the tank 1, the upper pipe 4, the cooler 5, and the middle pipe 6. Reference numeral 21 is a bypass circulation path including the upper pipe 4 and the middle pipe 6.

According to the first embodiment, the following effects are obtained.
The tank 1 and the cooler 5 were connected by a bypass circulation path 21, and the insulating oil was circulated between the tank 1 and the cooler 5 along the bypass circulation path 21 while the circulation pump 8 was stopped. Therefore, the flow of the insulating oil becomes smoother as compared with the conventional case in which the insulating oil is circulated along the circulation path 14 when the circulation pump 8 is stopped, so that the self-cooling required for cooling the transformer main body 2 is performed. Capacity is secured.

The two-point chain line in FIG. 2 shows the flow of insulating oil when the circulation pump 8 is operated in the absence of the middle valve 16 and the lower valve 18, and the insulating oil is inside the tank 1 by the suction force of the circulation pump 8. It flows back into the pipe 6 and is discharged from the inlet side lower pipe 7 into the tank 1 through the casing 9 of the circulation pump 8 and the outlet side lower pipe 13 without entering the cooler 5 having a large pressure loss. In this case, the amount of insulating oil supplied to the cooler 5 is insufficient, so that the required cooling performance cannot be obtained.

Since the bypass circulation path 21 was closed by the middle valve 16 and the circulation path 14 was opened by the lower valve 18 in the operating state of the circulation pump 8, the insulating oil did not flow back from the tank 1 into the inlet side lower pipe 7 and was regular. It comes to circulate along the circulation path 14 of (see FIG. 1). Therefore, since the required amount of insulating oil is supplied to the cooler 5, the required cooling performance can be obtained. Moreover, since the bypass circulation path 21 was opened by the middle valve 16 and the circulation path 14 was closed by the lower valve 18 while the circulation pump 8 was stopped, the insulating oil was circulated along the regular bypass circulation path 21. Become.

As shown in FIG. 3, an upper valve 31 is rotatably mounted in the upper pipe 4 about a shaft 32. Further, the valve 31 is rotatable between a vertically closed state (see FIG. 3) and a horizontal open state (see FIG. 4), and is attached from the closed state to the open state by the spring force of the release spring. It is being pushed. The upper valve 31 closes the upper pipe 4 so that the insulating oil cannot pass through in the closed state, and opens the upper pipe 4 so that the insulating oil can pass through in the open state.

As shown in FIG. 3, the oil outlet 33 is fixed to the tank 1 at a height between the oil outlet 3 and the oil inlet 15. One end of the horizontal upper pipe 34 on the inlet side is connected to the oil outlet 33, and the inlet of the casing 9 of the circulation pump 8 is connected to the other end of the upper pipe 34 on the inlet side. The lower end of the vertical outlet side upper pipe 35 is connected to the outlet of the casing 9, and the upper end of the outlet side upper pipe 35 is connected to the upper pipe 4 on the downstream side of the insulating oil flow from the upper valve 31. ing.

In a normal state in which the circulation pump 8 is not out of order, drive power is supplied from the power supply equipment to the circulation pump 8. The spring force of the release spring is set smaller than the upward wind force acting on the upper valve 31 from the circulation pump 8 in the operating state of the circulation pump 8. Under the normal state, the upper valve is set as shown in FIG. As the 31 is pushed upward by the wind force from the circulation pump 8, the opening state is changed to the closed state against the spring force of the opening spring. The upper valve 31 opens the upper end portion of the outlet side upper pipe 35 in the closed state, and in the normal state, the outlet side upper pipe 35 is in the open state when the upper pipe 4 is closed. Therefore, the insulating oil is forcibly circulated between the tank 1, the upper pipe 34 on the inlet side, the upper pipe 35 on the outlet side, a part of the upper pipe 4, the cooler 5, and the middle pipe 6. Reference numeral 36 is a circulation path including an inlet side upper pipe 34, an outlet side upper pipe 35, a part of the upper pipe 4, and a middle pipe 6, and the circulation pump 8 is interposed in the circulation path 36.

If the circulation pump 8 fails or the circulation pump 8 is maintained and inspected, the power supply equipment is turned off. When the power supply equipment is off, the drive power supply is cut off from the circulation pump 8, and the circulation pump 8 is stopped. In the stopped state of the circulation pump 8, the pressing force acting on the upper valve 31 from the circulation pump 8 disappears, and the upper valve 31 is changed from the closed state to the open state by the spring force of the open spring. When the upper valve 31 is open, the upper pipe 4 is opened when the outlet side upper pipe 35 is closed, and insulating oil circulates between the tank 1, the upper pipe 4, the cooler 5, and the middle pipe 6. Reference numeral 37 is a bypass circulation path including the upper pipe 4 and the middle pipe 6.

According to the second embodiment, the following effects are obtained.
The tank 1 and the cooler 5 were connected by a bypass circulation path 37, and the insulating oil was circulated between the tank 1 and the cooler 5 along the bypass circulation path 37 while the circulation pump 8 was stopped. Therefore, since the flow of the insulating oil becomes smooth, the self-cooling capacity required for cooling the transformer main body 2 is secured.

Since the bypass circulation path 37 was closed by the upper valve 31 in the operating state of the circulation pump 8, the insulating oil circulates along the regular circulation path 36 without flowing back from the tank 1 into the inlet side upper pipe 35. Become. Therefore, since the required amount of insulating oil is supplied to the cooler 5, the required cooling performance can be obtained. Moreover, since the bypass circulation path 37 is opened by the upper valve 31 while the circulation pump 8 is stopped, the insulating oil circulates along the regular bypass circulation path 37.

The valve 16 in FIG. 5 is connected to the plunger of the electromagnetic solenoid. This electromagnetic solenoid is a single-acting solenoid having a built-in return spring, and is connected to a power supply facility common to the pump motor 10 via wiring. This electromagnetic solenoid corresponds to a drive source, and drive power is continuously supplied from the power supply equipment. The plunger of this electromagnetic solenoid is stationary in the retracted position against the spring force of the return spring in the state of supply of the drive power, and the middle valve 16 is stationary in the closed state in the retracted position of the plunger. The plunger of this electromagnetic solenoid is stationary in the forward position by the spring force of the return spring when the drive power supply is cut off, and the middle valve 16 is stationary in the open state in the forward position of the plunger. Of these, the valve 16 corresponds to the valve body.

In a normal state in which the circulation pump 8 is not out of order, drive power is supplied from the power supply equipment to the circulation pump 8 and the electromagnetic solenoid. In this normal state, as shown in FIG. 5, the oil inlet 15 is closed by closing the middle valve 16 in the operating state of the circulation pump 8, and the insulating oil is supplied to the tank 1, the upper pipe 4, and the cooler 5. Forcibly circulates between a part of the middle pipe 6, the inlet side lower pipe 7 and the outlet side lower pipe 13.

If the circulation pump 8 fails or the circulation pump 8 is maintained and inspected, the power supply equipment is turned off. When the power supply equipment is off, the drive power supply is cut off from the circulation pump 8 and the electromagnetic solenoid, and as shown in FIG. 6, the middle valve 16 is opened when the circulation pump 8 is stopped. In the off state of the power supply equipment, the impeller 11 of the circulation pump 8 acts as a resistance to the flow of insulating oil, and the insulating oil in the cooler 5 enters the tank 1 from the middle pipe 6 through the oil inlet 15. That is, when the circulation pump 8 fails or the circulation pump 8 is maintained and inspected, insulating oil circulates between the tank 1, the upper pipe 4, the cooler 5, and the middle pipe 6.

According to the third embodiment, the following effects are obtained.
The tank 1 and the cooler 5 were connected by a bypass circulation path 21, and the insulating oil was circulated between the tank 1 and the cooler 5 along the bypass circulation path 21 while the circulation pump 8 was stopped. Therefore, the flow of the insulating oil becomes smoother as compared with the conventional case in which the insulating oil is circulated along the circulation path 14 when the circulation pump 8 is stopped, so that the self-cooling required for cooling the transformer main body 2 is performed. Capacity is secured.

Since the bypass circulation path 21 is closed by the middle valve 16 in the operating state of the circulation pump 8, the insulating oil circulates along the regular circulation path 14 without flowing back from the tank 1 into the inlet side lower pipe 7. Therefore, since the required amount of insulating oil is supplied to the cooler 5, the required cooling performance can be obtained. Moreover, since the bypass circulation path 21 is opened by the middle valve 16 when the circulation pump 8 is stopped, the insulating oil circulates along the regular bypass circulation path 21.

Since the middle valve 16 is opened and closed by the electromagnetic solenoid, the operator does not have to manually operate the middle valve 16. Moreover, since the middle valve 16 is closed when the drive power is supplied and opened when the drive power is cut off, the middle valve 16 is opened when the drive power is cut due to a failure of the circulation pump 8. It automatically switches from a properly closed state to an open state.

The upper valve 31 in FIG. 7 is connected to the plunger of the electromagnetic solenoid. The upper valve 31 is closed (see the broken line) when the driving power is supplied to the electromagnetic solenoid, and the upper pipe 4 is closed so that the insulating oil cannot pass through when the upper valve 31 is closed. The upper valve 31 is in an open state (see the alternate long and short dash line) when the drive power supply is cut off from the electromagnetic solenoid, and the upper pipe 4 is opened so that insulating oil can pass through in the open state of the upper valve 31. .. Further, the valve 31 corresponds to a valve body.

In a normal state in which the circulation pump 8 is not out of order, drive power is supplied from the power supply equipment to the circulation pump 8 and the electromagnetic solenoid. In this normal state, as shown by the broken line in FIG. 7, the upper valve 31 is closed in the operating state of the circulation pump 8, so that the upper pipe 4 is closed and the insulating oil is forcibly applied along the circulation path 36. Circulate.

If the circulation pump 8 fails or the circulation pump 8 is maintained and inspected, the power supply equipment is turned off. When the power supply equipment is off, the drive power supply is cut off from the circulation pump 8 and the electromagnetic solenoid, and as shown by the alternate long and short dash line in FIG. 7, the upper valve 31 is opened when the circulation pump 8 is stopped. When the power supply equipment is off, the impeller 11 of the circulation pump 8 acts as a resistance to the flow of insulating oil, and the insulating oil circulates along the bypass circulation path 37.

According to the fourth embodiment, the following effects are obtained.
The tank 1 and the cooler 5 were connected by a bypass circulation path 37, and the insulating oil was circulated between the tank 1 and the cooler 5 along the bypass circulation path 37 while the circulation pump 8 was stopped. Therefore, since the flow of the insulating oil becomes smooth, the self-cooling capacity required for cooling the transformer main body 2 is secured.

Since the bypass circulation path 37 was closed by the upper valve 31 in the operating state of the circulation pump 8, the insulating oil circulates along the regular circulation path 36 without flowing back from the tank 1 into the inlet side upper pipe 35. Become. Therefore, since the required amount of insulating oil is supplied to the cooler 5, the required cooling performance can be obtained. Moreover, since the bypass circulation path 37 is opened by the upper valve 31 while the circulation pump 8 is stopped, the insulating oil circulates along the regular bypass circulation path 37.

In Examples 1 to 4, a synthetic oil such as liquid silicone or a vegetable oil such as rapeseed oil may be used as the insulating oil.
In Examples 1 to 4, 6 sulfur fluoride or nitrogen or a gas such as carbon dioxide or air may be used instead of the insulating oil.

In the first embodiment, the circulation path 14 and the bypass circulation path 21 may be always open by eliminating the middle valve 16 and the lower valve 18. This also applies to Examples 2 to 4.

In the third embodiment, whether or not the circulation pump 8 is operating is detected by an electrical detection circuit, and when the detection circuit detects the operation of the circulation pump 8, a drive power supply is supplied to the electromagnetic solenoid. As a result, the middle valve 16 may be closed, and when the detection circuit detects that the circulation pump 8 has stopped operating, the middle valve 16 may be opened by shutting off the drive power supply from the electromagnetic solenoid. This also applies to Example 4.

In the third embodiment, the middle valve 16 may be opened and closed by a drive source such as a motor. This also applies to Example 4.
In Examples 1 to 4, the present invention may be applied to a static induction device other than a transformer such as a reactor.

Although the examples of the present invention have been described above, these examples are presented as examples and are not intended to limit the scope of the invention. These novel examples can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These examples and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 is a tank (container), 2 is a transformer (equipment body), 5 is a cooler, 8 is a circulation pump (pump), 14 is a circulation path, 16 is a medium valve (valve body), 21 is a bypass circulation path, 31 Is the upper valve (valve body), 36 is the circulation path, and 37 is the bypass circulation path.

Claims (5)

A container filled with refrigerant and
A device body that is housed in the container and is cooled by the refrigerant.
A cooler that cools the refrigerant and
A first pipe that horizontally connects the container and the cooler,
A second pipe that is connected perpendicularly to the pipe in the middle of the pipe,
A pump that is connected between the second pipe and the container and circulates the refrigerant between the container and the cooler in an operating state.
A third pipe that directly connects the pump and the container,
A valve body that is located in the first pipe and is located closer to the container than the connection portion between the first pipe and the second pipe and opens or closes the first pipe.
Between the container and the cooler, the first pipe, the second pipe, the pump, and the third pipe from the cooler side to the connection portion between the first pipe and the second pipe are inserted . When the path that passes through and circulates is used as the circulation path, and the path that circulates between the container and the cooler through the first pipe is used as the bypass circulation path.
In the operating state of the pump, the valve body closes the first pipe to circulate the refrigerant between the container and the cooler through the circulation path, and in the operating state of the pump, A stationary induction device characterized in that the valve body opens the first pipe to circulate the refrigerant between the container and the cooler through the bypass circulation path. The stationary induction device according to claim 1, further comprising an electrical drive source for operating the valve body between an open state and a closed state. The stationary induction device according to claim 2, wherein the valve body is in a closed state when the drive source is energized and is in an open state when the drive source is not energized. The static induction device according to any one of claims 1 to 3, wherein the container is filled with a liquid as the refrigerant. The stationary induction device according to any one of claims 1 to 3, wherein the container is filled with a gas as the refrigerant.

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