JPS6022444A - Coolant circulating device of rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the safety of controlling a coolant circulating passage by connecting a manifold with a coolant tank through a pressure regulator via a bypass circuit fed through a throttle mechanism between the primary and the secondary manifolds. CONSTITUTION:A bypass conduit 22 fed through a throttle unit 21 from the primary manifold 6 to the secondary manifold 7 is provided, and connected to a bypass conduit 24 fed via a pressure regulating valve 23 from the secondary manifold 7 to a coolant tank 1. Then, the coolant is obtained at the prescribed flow rate at any time, the pressure in the secondary manifold is controlled to the prescribed value to fall the pressure of the coolant circulating passage within the prescribed range to improve the safety of controlling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cooling water circulation device for a rotating electrical machine, and particularly to a cooling water circulation system for a rotating electrical machine for a turbine generator having a water-cooled rotor winding.

[Technical Backbone of the Invention] Conventionally, in a large capacity rotary motor, especially a turbine generator, the stator winding and the rotor winding, as well as the stator core and the ends of the stator core The stator end shield plate is used to reduce eddy current loss generated in surrounding structures due to magnetic flux leakage in the space.A cooling water circulation system is used to provide pure cooling with high cooling efficiency. There is. In this cooling 11 water circulation system, there is a cooling water tank that recovers the heat generated in the turbine generator, and a cooling water that circulates the cooling water stored in this cooling water tank to the cooling water circulation circuit of the rotary motor through a cooler. It has a pump.

This circulation circuit also includes a primary manifold that distributes cooling water near the turbine generator.

From this primary manifold to the fixed pre-bell 1 core of the generator and the end shields 41 and 2i of the stator core, respectively Ft
Through the force adjustment valve t)'? T-cooling 11 Water total introduction 1y 'el
IJ8 G,:3J,n 1st order a11st circulation circuit to which second manifold to the second manifold 1st order ε! A part of the cooled 7ifl water is again sent to the stator windings via the pressure regulating valve, and after cooling the stator windings, returns to the cold 7ifl water (111).The other part is recycled again. JT is added to the circulation pump and similarly sent to the rotor winding via a pipe through a pressure regulating valve. It has a recirculation circuit that returns to the

Such a configuration 4. By effectively using cooling water, minimizing the amount of cold N1 water required, and centralizing water supply and drainage, the C cooling water circulation system is made more compact. Mano [stator winding and rotation φ in the air-cooled water device]: The cold water supplied to the child winding is controlled by the pressure control valve to maintain the water pressure at a predetermined value. is controlled.

[Problems with the background technology] In the cooling water circulation system mentioned above, C is the winding circuit [1 part J], and the water flow resistance increases due to some reason such as a reduction in circuit area due to foreign matter in the cooling water circuit in the winding. In case 1), the supply pressure of λ cooling water is normal, and the amount of cooling water supplied to the winding C also decreases. However, when an abnormal temperature rise occurs in the winding as in the case of a sudden rise in temperature, there is a drawback that it is difficult to detect the abnormality in advance. In addition, in the cooling water circulation system described above, in order to control the flow rate of the FF force regulating valve provided in the primary circulation circuit, a predetermined pressure difference is required between the primary manifold and the secondary manifold. shall be. However, as mentioned above, when the amount of cooling water in the recirculation circuit fluctuates, in addition to the change in the supply pressure from the pump due to the characteristics of the cooling water pump, the difference in water flow resistance between the primary circulation circuit and the recirculation circuit causes There are problems such as the power of the secondary manifold fluctuating and the control of the flow rate of cooling water in the primary circulation circuit becoming unstable.

OBJECT OF THE INVENTION] The present invention has been made to solve the above-mentioned problems, and it is possible to ensure a predetermined flow ω of cooling water to be supplied to the stator core, stator windings, rotor windings, etc. at any time. Controlling the pressure in the secondary manifold to a predetermined value t1
It is an object of the present invention to provide a cold N1 water circulation system for a rotating electric machine, which maintains the pressure of a cooling water circulation path within a predetermined range by controlling 11'iJ' and improves control stability.

[Summary of the Invention 1 That is, in the cooling water circulation system for a rotating electrical machine of the present invention, the circuit for supplying cooling water to the stator core, stator winding, rotor winding, etc. A bottom flow valve having a mechanism for keeping the differential pressure constant is provided, and the bypass circuit and the above are connected through a throttle mechanism that communicates the primary manifold and the secondary manifold. A primary pressure regulating valve is provided to control the primary side circulation pressure of the valve that communicates the secondary manifold with the cooling water tank, and a bypass circuit is provided to control the pressure of the secondary manifold in each of the circuits. Flow rate controllable difference if (r 4'a
: To ensure that it is always maintained at a predetermined value,
There are two things. However, according to the present invention, the pressure and flow rate of the cooling water circulation circuit can be controlled to be constant at the same time.

[Embodiment of the Invention] An embodiment of the apparatus according to the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 1 indicates a cooling water tank.
The cooling water stored in the cooling water pump 2 is pressurized by the cooling water pump 2, passes through the cooler 3, the humidity control valve 4, and the cooling water filter 5, and is guided to the primary manifold 6 provided near the turbine power generator 111i10.

A primary cooling water circulation circuit is formed from the primary manifold 6 mainly consisting of three paths for cooling the stator core 12 of the turbine generator 10 and conveying the cooling water to the secondary manifold 7.

That is, in the first path, cooling water is supplied to the stator core end shield plate 11 having a water passage hole (not shown) inside through the pipe line 8a to cool the fixed shield plate 11. This is a circuit that flows to the secondary manifold 7'. The second route passes through a stator core cooling pipe 13 buried in the axial direction of the core in order to cool the stator core 12 through a conduit 8b, and then passes through a stator core cooling pipe 119b.
This circuit flows to the secondary manifold via the The third path is connected to the conduit 80 at the end 111 of the stator core 12.
This circuit flows to the secondary manifold 7 via the stator core cooling plate 14, which is buried parallel to the laminated surface of the iron core and has water holes (not shown) therein, and the flow rate adjustment valve 9C. Additionally, a primary bypass circuit 22 is connected between the primary manifold 6 and the secondary manifold 7 via a throttle device 21.
is provided. Further, from the secondary manifold 7, a stator winding 15 and a rotor winding 16 of the turbine generator are connected.
A recirculation circuit is provided which returns the temperature to the cooling water tank 1.

That is, a part of the cooling water sent to the secondary manifold 7 passes through the flow rate regulating valve 9d to the supply pipe 17 and is sent to the stator winding 15, cooling the stator winding 15 and raising the temperature. and return to the cooling water tank. Also, some of the cooling water in Sen is recirculated by pump 1.
8, the flow rate is adjusted to a constant flow rate through the flow adjustment valve 90, and the flow is supplied to the rotor winding 16 through the recirculation filter 19 and the supply pipe 20. After cooling the rotor winding, the flow is returned to the return pipe 2.
7, the water is returned to the cooling water tank 1. Furthermore, a bypass circuit 24 equipped with a primary side pressure regulating valve 23 is provided between the secondary manifold 7 and the cooling water tank 1.
The pressure within the secondary manifold 7 can also be adjusted by bypassing a portion of the cooling water directly to the cooling water tank 1.

Next, the operation of the cooling water circulation device for the rotating electric machine will be explained.

As described above, the flow rate adjustment valve 9 used in the cooling water supply circuit
The control valves a, 9b, 9c, 9d, and 9e are operated so that the differential pressure across the control valves themselves is always maintained at a predetermined pressure.

Therefore, even if the pressure angle in the cooling water supply circuit including the flow rate adjustment valve fluctuates, the so-called front side or rear side pressure of the valve changes, the cooling water circulation system is operated so that a predetermined flow rate always flows. Primary manifold 6
A primary circulation circuit that circulates the cooling water from C through the stator core portion to the secondary manifold 7 and returns to the cooling water tank 1 from the secondary manifold 7 through the stator and rotor windings 15 and 16 7- A cooling water supply circuit is formed by connecting the recirculation circuit and the recirculation circuit in series. Therefore, if there is a difference in the amount of cooling water required in the cold W section in the generator between the primary circulation circuit and the recirculation circuit, the amount of cooling water passing through the bypass circuits 22 and 24 can be adjusted to from the second
The flow rate circulating to the secondary manifold 7 and the flow rate returning from the secondary manifold 7 to the cooling water tank 1 are made equal, and the cooling water is stably circulated at a predetermined value. Here, the primary pressure regulating valve 23 releases a portion of the cooling water from the secondary manifold 7 to the cooling water tank 1, thereby adjusting the pressure within the secondary manifold 7 to a constant pressure. Therefore, the pressure in the secondary manifold 7 is maintained at a predetermined pressure necessary to supply cooling water to the stator winding 15, and the pressure difference between the primary manifold 6 and the secondary manifold 7 is reduced by the above-mentioned flow. The required predetermined difference in liquid is maintained by controlling the flow rate of the regulating valves 8a, 8b, and 8C. For example, as mentioned above, if a phenomenon occurs such as the inside of the recirculation circuit being narrowed by foreign matter, etc., the resistance of the recirculation circuit increases and the pressure in the 8th secondary manifold 7 tends to rise by 1. .

By operating the primary manifold 23 on the primary side to release pressure from the bypass circuit 24 to the cooling water tank 1, the pressure in the secondary manifold 7 is maintained at a predetermined pressure.

According to the above embodiment, the cooling water supplied to the cooling section in the turbine generator 1 can maintain a predetermined flow rate in any case, so even if the pipe resistance suddenly increases due to foreign matter generated in the cooling water circulation path or filter clogging, etc. Even if the temperature increases, a sudden temperature rise inside the turbine generator can be prevented. In addition, by keeping the internal pressure in the secondary manifold constant, the pressure in the water flow circuit that passes through the windings of the turbine generator can be maintained at a constant pressure without being affected by pressure fluctuations in the cooling water circulation circuit, resulting in stable operation. This contributes to improving the life and safety of the winding.

Furthermore, by operating the pressure within the cooling water circulation circuit within a predetermined range, stable control of the flow rate adjustment valve becomes possible, which improves the operational performance of the cooling water circulation system for rotating electric machines, and ultimately improves reliability. .

Figure 2 shows an embodiment of the present invention.
3 In the embodiment shown in Fig. 1, the secondary manifold and cold 7711
A bypass circuit connecting the water tank was provided with a control valve on the next side, but in this embodiment, as shown in Figure 2, the primary manifold 6 and the secondary manifold 2 are connected to the secondary side. They are communicated through a bypass circuit 27 via a side pressure regulating valve 25 ( ), and are communicated with a cooling water tank such as the secondary manifold 7 through a bypass circuit 28 via a throttle device 26 . In this embodiment as well, the previous i[! The same effects as in FIG. 2 can be achieved.

[Effects of the Invention] As described above, according to the present invention, a constant amount of cold W water to be supplied to the cooling section in the turbine generator can be ensured at all times, and the pressure in the water flow circuit can also be controlled at a constant level, so that the rotating electric machine can be In addition to ensuring stable operation of the cooling water circulation system,
I Provide a reliable cooling water circulation system for rotating electric machines with improved safety that can prevent abnormal temperature peaks in the cooling section of the Kubin generator, such as the windings, even if the water circulation circuit is clogged with an object. can do.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are system diagrams showing respective embodiments of a cooling water device for a rotating electric machine according to the present invention. 1......Cooling water tank 2...Cooling water pump 3...
......Cooler 4...Temperature control valve 5...
・・・・・・Filter 6・・・・・・・・・・Primary manifold 7・・・・・・・・・・・・Second manifold Ba 1sb, sc”・w path 9a , 9b, 9c, 9d, 9e...Flow rate regulating valve 10...Turbine generator 11...
......Shield plate 12...
...Stator core 13...Stator core cooling pipe 14...Stator core cooling plate 11-15... ...Stator winding 16...
・・・・・・・・・Same trochanter @ line 17・・・・・・・・・・
...Supply pipe 18...Recirculation pump 19...
......Recirculation filter 20...
...... Supply pipe 21 ...... Squeezing device 22 ...
......Bypass circuit 23...
...-Next pressure regulating valve 24... Bypass circuit 25 ...... Secondary pressure regulating valve 26... ...Aperture device 27...
......Bypass circuit 28...
...Bypass circuit agent valve Sokujusu Yamasa - 12-

Claims (1)

[Claims] (1) A cooling water tank, a cooling water pump that introduces the cooling water stored in the cooling water tank to the cooling water circulation system of the rotating electrical machine via the cooler, and a cooling water pump that is in the circulation circuit and introduces the cooling water stored in the cooling water tank to a part of the rotating motor. A primary manifold that distributes cooling water, a secondary manifold that collects and distributes cooling water that has cooled a part of the rotary motor, and from this M secondary manifold to the stator winding of the rotating electrical machine via a pressure regulating valve. A cooling water circulation system for a rotating electric machine, comprising a circulation circuit that introduces cooling water, and a circulation circuit that has a recirculation cooling water pump that introduces the cooling water to the rotor winding of the rotating electric machine via a pressure regulating valve. A first bypass pipe is provided from the first manifold to the second manifold via a throttle device, and a second bypass pipe is provided from the second manifold to the cooling water tank via a primary side pressure regulating valve. A cooling water circulation device for a rotating electrical machine, characterized in that the cooling water circulation device for a rotating electric machine is configured to communicate with the pressure in the second manifold to a predetermined value.