JPH02309167A - Cooler for electric apparatus - Google Patents

Abstract

PURPOSE:To eliminate overcooling even when the load of an electric apparatus is lowered and to obtain a necessary cooling water flow rate by providing a pump controller for setting the flow rate of necessary minimum limit to a pump based on a detection signal to be output from a load detector, and regulating the introducing amount of cooling water to each electric apparatus in response to the ratio of necessary cooling water amounts of the apparatuses. CONSTITUTION:A load detector 17 is provided in a variable load electric apparatus 16, and a detection signal 101 output from the detector 17 is input to a pole changer 18 as a pump controller. The changer 18 sets the flow rate of necessary minimum limit to a pump 12 based on the signal 101. Control valve controllers 29, 30 receive the signals 102 from the changers 18 to obtain the ratio of the necessary cooling water quantities of the apparatuses 15, 16, calculates the cooling water introducing amounts to the apparatuses 15, l6 in response to the ratio, and outputs control signals 104, 104 to control valves 21, 22. Thus, the cooling water flow rates are efficiently determined in response to the variation in the load of the apparatus to be operated with variable load and the cooling water can be sufficiently supplied.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cooling device for electrical equipment that cools a plurality of electrical equipment having different load patterns.

(Prior Art) Conventionally, as a cooling device for electrical equipment, for example, as shown in FIG. Electrical equipment 4 and variable load electrical equipment 5 operated with variable load
There are some that are arranged in parallel. Note that 6 and 7 are manual @a level adjusting valves.

Heat generated by operating each of the electrical devices 4 and 5 is released into cooling water as a cooling medium, and the heated cooling water is released in the cooler 1 by means such as air cooling or water cooling. Conventionally, 1ffi of this cooling water is used for each electric Il.
It is roughly defined according to the maximum load of the device 4.5.

(Problem to be Solved by the Invention) However, since the cooling water flow is set so that sufficient cooling is possible when both electric devices 4 and 5 are at maximum load, the load on the variable load electric device 5 decreases. If so, the same electrical equipment 5
is supercooled. For cooling, it is only necessary to ensure a cooling water flow rate that matches the load of electrical equipment, so during low load times, an excessive amount of water is flowing than the required cooling water flow rate, and this excess cooling water flow rate is wasted. Become something.

The present invention was made in view of these circumstances, and even when the load on electrical equipment decreases, it does not become overcooled.
Furthermore, the present invention provides a cooling device for electrical equipment that can secure a sufficient amount of required cooling water flow.

[Structure of the invention]

(Means for Solving Problem 0!) The present invention provides an electric device in which a plurality of electric devices, at least one of which is operated under a variable load, are arranged in parallel in a closed-loop cooling water circulation system having a cooler and a pump. cooling 8M
A load detector is provided corresponding to the electrical equipment that is operated under variable load, and the pump is supplied with the minimum necessary flow based on the detection signal output from the load detector.
and a pump control device for setting each electric lli! based on the detection signal. Determine the ratio of the required amount of cooling water between the appliances, and adjust the amount of cooling water flowing into each electrical equipment according to that ratio.
The present invention is characterized in that it is provided with a flow rate adjusting means for adjusting the flow rate.

(Function) According to the present invention, when the load of the variable load electrical equipment decreases, the overall cooling water flow l is reduced by controlling the operation of the pump. On the other hand, the required cooling water flow m difference when the load of the variable load electrical equipment changes is ensured by the flow rate adjustment means.

(Example) An example of the present invention will be described below with reference to FIGS. 1 to 3.

In this embodiment, a pair of parallel branch pipes 13 and 14 are provided in a closed loop cooling water circulation system 12a having a cooler 11 and a pump 12, and one branch pipe 13 is connected to a constant load electric device 15. A variable load electric device 16 is arranged in the other branch pipe line 14. In addition, pump 1
The motor No. 2 is of a pole number conversion type, and the pump flow rate increases when operating with a low number of poles, and the pump flow rate decreases when operating with a high number of poles.

The variable load electrical equipment 1d is provided with a load detector 17,
A detection signal 101 output from the load detector 17 is input to a peak converter 8 as a pump control device. This peak converter 18 has a detection signal 101
Based on this, the minimum necessary flow rate is set for the pump 12.

In addition, each branch pipe 13.14 includes each electrical equipment 15.1.
Flow rate adjusting means 19 and 20 are provided upstream of the pumps 6 and 6, respectively. Each flow regulating means 19.20 includes a pair of automatically operated control valves 21.2 arranged in series with each other.
2 and manual valves 23 and 24 for manual operation. Note that bypass piping 25.26 that bypasses the multiple valves 21, 22, 23, and 24 is provided, and each bypass piping 25.26 is also provided with a manual valve 27.28, respectively.

Each control valve 21,22 is adapted to be controlled by a control valve controller 29,30. That is, each control valve controller 29, 30 receives the output signal 102 from the pole number converter 18, determines the ratio of the amount of cooling water required between each electrical device 15, 16, and adjusts each electrical device 15 according to the ratio. ．．
16, and outputs control signals 103 and 104 to each control valve 21 and 22.

Next, the effect will be explained.

Constant load electrical equipment 15 is always operated with a constant load.

Further, the variable load electrical equipment 16 is operated with a variable load.

The load of the variable load electrical equipment 16 is detected by the load detector 17, and if the load is low, the detection signal 101 is input from the load detector 17 to the peak converter 18, and the pump 1
2 is tooth pole labor-saving operation.

At the same time as the pump 12 enters the tooth pole labor-saving operation, the control signal j = 3103°104 from the control valve controller 29.30.
is input to the control valves 21 and 22, and the control valve 21 on the constant load electrical separator 15 side is driven in the opening direction, and the control valve 22 on the variable load electrical equipment 16 side is driven in the closing direction. As a result, the flow path resistance of the cooling water flowing through each electric machine 515.16 changes. In addition, when the load of the variable load electrical equipment 16 is high, the pump 12 enters the low-pole rated operating state and at the same time each control valve 2
1°22 is controlled to open and close in the opposite direction. As a result, the flow path resistance of the cooling water flowing to each electrical device 15, 16 changes,
A rated cooling water flow rate is ensured for the constant load electrical equipment 15, and a necessary cooling water flow rate during high load is ensured for the variable load electrical equipment 16.

FIGS. 2 and 3 show the flow rate characteristics of am for adjusting the flow path resistance. That is, FIG. 2 shows the pump 12
The figure shows the relationship between the cooling water base and the head. Assuming that the pressure loss at the inlet of the pump 12 (point a in Fig. 1) is curve A, the intersection of curve A with the low pole operation characteristic curve and the tooth pole operation cantilever characteristic curve is found. . Since each of these intersection points (2) is the rated point during each operation, the pump operation is controlled so that the cooling water layer corresponds to this point.

On the other hand, FIG. 3 shows the relationship between the cooling water base and the flow path resistance at each position (point b and point 0) of the downstream integrated portion of the branch pipes 25 and 26 in FIG. In Figure 3, curve B
is the pressure loss curve at point b during low tank operation, curve B' is the pressure loss curve at point b during tooth pole operation, and curve C is the pressure loss curve at point 0.

As described above, the pump 12 has a significantly different pump head and cooling hydrosphere between the tooth pole operation and the low tank operation. Therefore, pump 1
If the flow rate of each electrical equipment 15.16 is set at the low pole operation rated point in step 2, the cooling water O will change at the same rate for each electrical equipment 15.16 when operated at the toothed pole operation rated point ■. The amount of cooling water flowing to the constant load electric machine 2S15 cannot secure the amount of water necessary for cooling, and on the other hand, the amount of cooling water flowing to the variable load electric machine 16 will flow more than necessary.

Therefore, when operating at the tooth pole operation rated point (■), the flow resistance of the cooling water flowing to the constant load electrical equipment 15 is reduced, the flow resistance of the cooling water flowing to the variable load electrical equipment 16 is increased, and the constant load electrical equipment It is necessary to control the 15 cooling water layers to be constant.

Therefore, a flow regulating means 19.20 consisting of a control valve 21.22 and a manual valve 23.24.
The flow path resistance of the cooling water flowing to each electrical device 15 and 16 is adjusted by the throttle of 7.28.

Regarding the flow path resistance curve B and the flow path resistance curve B', since the amount of cooling water of the constant load electrical equipment 15 is always constant, the branch piping 13 where the rated load electrical equipment type 15 is installed
The resistance of is constant. However, the flow path resistance of the portion shared with the variable load electrical equipment 16 has a resistance curve that differs by the resistance valve B-82, which corresponds to the difference in flow a between the low tank operation and the tooth pole operation.

On the other hand, the total amount of cooling water at the low operating rated head of the pump 12 is on the line (■), and the amount of cooling water flowing to the constant load electrical equipment 15 is on the line (V). If the cooling water layer flowing to each electrical device 15.16 is not controlled, the flow path resistance of the cooling water flowing to each electrical device 15.16 will change on the resistance curves of B and C, so it will be constant. The cooling water j flowing to the load electric equipment 15 has a large layer of cooling water corresponding to the rated cooling water amount V to It flows a little. Therefore, on the constant load electric equipment 15 side, by adding the flow path resistance by ■, the resistance curve B is changed to
Change the curve to pass through to ensure the rated cooling water volume ■. Also,
By reducing the flow resistance by Iχ, the variable load electric Ti device 16 changes the resistance curve C to a curve passing through the gap, and the rated cooling water amount is The amount of cooling water is on the line (■), and the amount of cooling water m flowing through the constant load electric generator 15 is on the line (V). Each electrical equipment 15, 16
If there is no control over the cooling water flowing to the electrical equipment 15 and 16, the flow path resistance of the cooling water flowing to each electrical device 15 and 16 will be B'.
and changes on the resistance curve of C. Since the flow path resistance of the cold n1 water flowing into the constant load electrical equipment 15 is greater than the rated point X■, it becomes less than the rated cooling water mV. Further, since the flow path resistance of the cooling water flowing to the variable load electrical equipment 16 is smaller than the rated point (2), the amount of cooling water flowing through the variable load electrical equipment 16 is smaller than the rated water ITV. By offsetting this, the rated cooling water level of each electric separate unit 15, 16 is maintained at TKi. In addition, an operation is performed to reduce the flow path resistance of the cooling water flowing to the constant load electrical equipment 15 by (■) and to increase the flow path resistance of the cooling water flowing to the dynamic load electrical equipment 16 by (2). The principle of such cooling water adjustment is explained by the control valves 21, 22 and manual valves 23, 24, 27, 2.
The explanation along with the action of No. 8 is as follows.

That is, when the load of the variable load electrical equipment 16 is low, the manual valve 28 of the bypass pipe 26 on the upstream side thereof is throttled.

As a result, the resistance corresponding to (2) is given to the flow path resistance of the cooling water flowing through the electrical equipment 16. When the variable load electrical equipment 16 is under high load, the manual valve 27 is throttled to add a resistance equivalent to (2) to the flow path resistance of the cooling water flowing to the constant load electrical equipment 15. Furthermore, by adjusting the manual valve 23 so as to reduce the resistance corresponding to the flow path resistance of the cooling water flowing into the constant load electricity [15] when the variable load electricity generator 16 is under low load, the constant load electricity generator 15 The rated cooling water flow rate of the variable load electrical equipment 16 and the required cooling water flow rate at low loads of the variable load electrical equipment 16 are ensured. In addition, when the variable load electrical equipment 16 is under high load, the manual valve 24 is placed on the constant load The rated cooling water flow rate of the electric equipment 15 and the variable load (electrical equipment 16) are adjusted so as to ensure the necessary cooling water flow layer during high loads.

Note that, as shown in FIG. 4, the manual valve for controlling the cooling water flow layer may be omitted, and the intermediate opening degree may be set using the control valves 21 and 22. For example, during high-load quick drying of the variable load electric equipment 16, the pump 12 is set to low tank operation, the control valve 21 on the constant load electric carrier 15 side is set to the intermediate position, and the control valve 16 side on the variable load electric separate unit 16 side is set to the intermediate position. By fully opening the control valve 22, the flow path resistance of constant load (cold H) water flowing to the electrical equipment 15 side is increased, and the flow path resistance of cooling water flowing to the variable load electrical equipment 16 side is reduced. This will ensure the necessary flow of water for each electrical device 15.16.

In addition, when the load of the electric equipment 16 is low, the pump 1
2 is set to high-speed operation, and the control valve 21 is fully open, while the control valve 22 is set to the intermediate position, the constant load electricity 151
By reducing the flow path resistance of the cooling water flowing to the 5 side and increasing the flow path resistance of the cooling water flowing to the variable load electric m unit 16,
It is also possible to ensure the required amount of cooling water for each electrical device 15, 16, thereby performing labor-saving operation when the variable load electrical device 16 is under low load.

Further, as shown in FIG. 5, a flow rate detector 31 and a control valve controller 32 based on the output signal thereof are provided on the constant load electric equipment 15 side, and by controlling the valve opening degree of the control valve 21, the constant load electric 8! The cooling water flow layer flowing into the vessel 15 is always constant, and also changes! A temperature detector 33 is provided to detect the temperature of the cooling water after passing through the load electrical equipment 16, and the pump 12 is controlled so that the temperature detected by the temperature detector 33 always becomes the rated cooling water temperature of the variable load electrical equipment 16. It's okay.

In this case, instead of changing the number of poles, the inverter 19.34 may be used and its output frequency may be varied to control the rotational speed variable ability of the pump 12.

According to such a configuration, the cooling water flow 2 flowing to the constant load electrical equipment 15 can be controlled at a constant rate, and the fluctuating load '1'
The cooling water flow layer flowing through the pipe 16 can ensure the necessary low cooling water flow ml to accommodate load fluctuations. Thereby, the cooling water flow can be linearly controlled over the entire load duty range of the variable load electrical equipment 16.

〔Effect of the invention〕

As described above, according to the cooling device for an electric hand grip according to the present invention, a cooling water flow layer can be efficiently and sufficiently secured in response to load fluctuations of electrical equipment operated under variable load. Effects such as a significant improvement in economic efficiency can be achieved.

[Brief explanation of drawings]

Fig. 1 is a system diagram showing an embodiment of the cooling device for electrical equipment according to the present invention, Fig. 2 is a characteristic diagram showing the conversion performance of the pump rotation speed, and Fig. 3 is the cooling water flowing to each electric appliance. Characteristic diagrams showing the relationship between flow path resistance and cooling water flow layer, Figures 4 and 5.
Each figure is a system diagram that does not show other embodiments of the present invention, and FIG. 6 is a system diagram that shows a conventional example. 11... Cooler, 12... Pump, 15... Steady load electrical equipment, 16... Variable load electrical equipment, 18...
・Pole number converter, 17...Load detector, 19, 20...
・Flow m adjustment means, 21.22...Flow control valve. Representative Patent Attorney Nori Chika Ken Shu
No. 1 Kendoso Figure 1 Immediate water consumption Figure 2 Rei-gun water volume Figure 3 Figure 5

Claims (1)

[Claims] In a cooling device for electrical equipment, in which a plurality of electrical equipment, at least one of which is operated under a variable load, are arranged in parallel in a closed-loop cooling water circulation system having a cooler and a pump,
A load detector is provided corresponding to the electrical equipment operated under a variable load, and a pump control device is provided for setting the minimum necessary flow rate for the pump based on a detection signal output from the load detector, and The electrical equipment is characterized in that it is provided with a flow rate adjustment means that determines the ratio of the required amount of cooling water between each electrical equipment based on the detection signal and adjusts the amount of cooling water flowing into each of the electrical equipment according to the ratio. Cooling system.