JP4106768B2 - Cooling fan hydraulic drive system for cold water tower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling fan hydraulic pressure driving device for a cold water tower that can perform stable hydraulic driving when the cooling fan of the cold water tower is driven by a hydraulic motor.
[0002]
[Prior art]
FIG. 4 shows an example of a chilled water tower that cools hot water . In this type of chilled water tower, an air suction surface (louver surface) for taking outside air into the chilled water tower body 1 is provided on the side surface of the chilled water tower body 1. ) 2 is provided, and an air discharge port 3 equipped with a cooling fan 4 is provided in the center of the top of the chilled water tower body 1, while The hot water tank 6 is provided to receive the hot water 5a supplied through the hot water supply pipe 5 and spray it into the cold water tower body 1, and the hot water 5a sprayed from the lower surface of the hot water tank 6 through the water spout. Is cooled by being brought into direct contact with the outside air taken in from the air suction surface 2 by the cooling fan 4 so that the hot water 5a can be recovered in the lower water tank 7 as cold water 5b.
[0003]
Further, as a driving method of the cooling fan 4 of such a chilled water tower, as shown in FIG. 5 , an electric motor 8 is installed in the vicinity of the air outlet 3 at the top of the chilled water tower main body 1, and a drive shaft connected to the electric motor 8. 9 is connected to the cooling fan 4 via a reduction gear 10 so that power can be transmitted, and the drive shaft 9 is covered with a common bed 11.
[0004]
Further, by adopting a pole change motor as the electric motor 8, it is possible to operate at 50% and 100%, or by adopting an inverter-equipped motor as the electric motor 8, it is operated at 50-100% control. In some cases.
[0005]
However, in any case, since it is a mechanical drive system using the electric motor 8, there is a problem that the starting current increases, and the electric motor 8 or the speed reducer 10 is installed at the top of the chilled water tower body 1. In addition, there was a problem that maintenance work was difficult.
[0006]
In order to deal with this problem, the present applicant has previously filed Japanese Patent Application No. 59-30035 (Japanese Patent Laid-Open No. 60-174000).
[0007]
In the already filed invention, the cooling fan is driven to rotate by a hydraulic motor driven by receiving the hydraulic fluid from the hydraulic pump through the switching control valve, and the hydraulic pump is driven by an electric motor, The switching control valve is controlled by an electric signal.
[0008]
According to such a configuration, it becomes possible to install the electric motor at a place where maintenance and inspection on the ground side is easy, and furthermore, since the electric motor only needs to drive the hydraulic pump, the starting current can be reduced. There is.
[0009]
[Problems to be solved by the invention]
However, in the invention of the above-mentioned application, the hydraulic fluid from the hydraulic pump is sent to the hydraulic motor via the switching control valve. However, the cooling fan and the hydraulic motor are generally about 10 meters from the ground. It is installed at a height or a position higher than that, and therefore, the highest hydraulic motor becomes below atmospheric pressure due to the liquid column depending on the specific gravity of the hydraulic pressure and the difference in height of the hydraulic flow path. Here, the liquid column represents the height of the liquid surface at which a vacuum is generated at the top of the vertical tube in which the working fluid is confined at atmospheric pressure. That is, the value obtained by multiplying the specific gravity of the hydraulic fluid by the height of the liquid column is the atmospheric pressure, the specific gravity of water is 1, so the water column is about 10 meters, and the hydraulic fluid having a specific gravity of less than 1 has a liquid column of 10 meters. That's it.
[0010]
As described above, when the hydraulic pressure channel becomes atmospheric pressure or less, air is sucked from a minute gap, and the reserve tank of the power unit overflows, or a space is created in the hydraulic pressure channel that is originally filled with hydraulic pressure. If the cooling fan is stopped for a long time, the inner surface of the pipe will be rusted, or air sucked in while the cooling fan is being driven will cause noise and vibration due to cavitation in the return line. Had.
[0011]
The present invention has been made in view of the above circumstances, and when the cooling fan of the chilled water tower is driven by a hydraulic motor, the pressure of the highest hydraulic motor section is increased even if the height of the hydraulic flow path is large. An object of the present invention is to provide a cooling fan hydraulic pressure drive device for a chilled water tower that can be maintained at a pressure higher than the atmospheric pressure.
[0012]
[Means for Solving the Problems]
The present invention relates to a cooling fan for a chilled water tower in which a hydraulic motor is connected to a cooling fan for a chilled water tower, and the hydraulic motor is connected to a power unit installed on the ground side by a hydraulic pressure supply line and a return line of a hydraulic flow path. A hydraulic drive device, comprising: a head pipe having a length extending from the power unit position to a position higher than the highest part of the hydraulic flow path and having a vent at the upper end; and a drain line of the hydraulic motor. Connected to the head pipe at a position higher than the drain outlet of the hydraulic motor, and connected the suction line and the return line of the hydraulic pump provided in the hydraulic pressure supply line to the lower part of the head pipe , A level sensor that detects the liquid level in the head pipe in a position above the drain line connection portion of the head pipe, and the head pipe according to the detection level of the level sensor A cooling fan hydraulic drive apparatus of cooling tower, characterized in that a supply pump connected to the lower portion of the head pipe to the liquid, it relates to.
[0013]
In the above, to place a check valve between the hydraulic pump and a hydraulic motor in the hydraulic supply line may be arranged as a return pilot check valve in an intermediate position of the line, were or, Les Berusensa Instead, a level switch for starting and stopping the supply pump may be provided.
[0014]
[0015]
[0016]
The above-described cooling fan hydraulic pressure driving device for a chilled water tower according to the present invention is provided with a head pipe extending to a position higher than the highest part of the hydraulic flow path connected to the hydraulic motor of the cooling fan, and a drain line of the hydraulic motor is provided. The head pipe is connected to the head pipe at a position higher than the drain outlet of the hydraulic motor , and the suction line and the return line of the hydraulic pump provided in the hydraulic pressure supply line are connected to the lower part of the head pipe. A level sensor for detecting the liquid level in the head pipe in a position above the drain line connecting portion of the head, and a replenishment pump connected to the lower portion of the head pipe so as to supply liquid to the head pipe according to the detection level of the level sensor since a configuration including bets, pressure emergency hydraulic fluid path of the return in the line even though would subatmospheric, hydraulic fluid path is always the working fluid of the head pipe Therefore, it is possible to prevent air from being sucked in. Therefore, rusting occurs on the inner surface of the pipe due to air being sucked into the hydraulic flow path, or the return line is turned on while the cooling fan is being driven. It is possible to prevent problems such as noise and vibration caused by cavitation.
[0017]
When so as to automatically perform the supply of hydraulic fluid to the head pipe includes a level switch for starting and stopping of the supply pump in place of the level Rusensa can supply of hydraulic fluid to the head pipe easily.
[0018]
[0019]
Furthermore, if a check valve is arranged between the hydraulic pump and the hydraulic motor in the hydraulic supply line and a pilot check valve is arranged in the middle position of the return line, the height of the hydraulic flow path can be divided up and down. Therefore, the intake of air can be prevented even in a high-temperature cold water tower.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 and FIG. 2 show an example of an embodiment for carrying out the present invention . In the figure , the same reference numerals as those in FIG. 4 denote the same components.
[0022]
As shown in FIGS. 1 and 2, the output shaft of the hydraulic motor 12 is connected to the cooling fan 4 of the air outlet 3 provided at the top of the chilled water tower body 1, and is driven by the electric motor 13. A power unit 15 having a hydraulic pump 14 is installed on the ground, and the hydraulic pump 14 of the power unit 15 is connected to the hydraulic motor 12 by a hydraulic pressure supply line 16a of the hydraulic flow path 16 and the hydraulic motor 12 is returned. The return line 16b of the hydraulic pressure channel 16 is connected to the side. As the hydraulic pump 14, a variable displacement pump, a fixed displacement pump, or a combination thereof can be used.
[0023]
In the above configuration, the head pipe 17 having a length extending from the position of the power unit 15 to a position higher than the highest portion of the hydraulic flow path 16 is provided. The upper end of the head pipe 17 is opened by a vent hole 18.
[0024]
The drain line 19 of the hydraulic motor 12 is connected to the head pipe 17 at a position higher than the drain outlet 19 a of the hydraulic motor 12.
[0025]
Further, the suction line 20 of the hydraulic pump 14 provided in the hydraulic pressure supply line 16 a and the return line 16 b are connected to the lower part of the head pipe 17. Further, instead of connecting both the suction line 20 and the return line 16b to the head pipe 17 in this way, only the suction line 20 is connected to the head pipe 17, and the return line 16b is a two-dot chain line 16b 'in FIG. As shown in the figure, it may be connected in the middle of the suction line 20.
[0026]
A level sensor 21 for detecting the liquid level in the head pipe 17 is provided at a position above the connection portion of the drain line 19 in the head pipe 17. A replenishment pump 22 adapted to supply liquid is connected. The detection level detected by the level sensor 21 is transmitted to the ground side, and the reserve tank 24 is operated by manually operating the drive of the electric motor 23 based on the detection level to operate the supply pump 22. The hydraulic fluid can be replenished to the head pipe 17 via the replenishment pump 22 and the check valve 25.
[0027]
Although FIG. 2 shows the case where the replenishment pump 22 is driven manually, a level switch 26 is provided in place of the level sensor 21 as shown in FIG. 3, and the motor 23 is activated by the operation of the level switch 26. It is also possible to stop and automatically supply and stop the hydraulic fluid by the supply pump 22.
[0028]
Further, a check valve 31 is arranged between the hydraulic pump 14 and the hydraulic motor 12 in the hydraulic pressure supply line 16a, and a pilot check valve 32 is arranged at an intermediate position of the return line 16b.
[0029]
When a plurality of the cooling fans 4 are provided in the chilled water tower, a head pipe 17 may be provided corresponding to the hydraulic flow path 16 of each cooling fan 4. The drain line 19 may be connected to one head pipe 17.
[0030]
The operation of the embodiment shown in FIGS. 1 to 3 will be described below.
[0031]
Prior to the operation of the cooling fan 4, the inside of the head pipe 17 and the inside of the hydraulic passage 16 are filled with the working fluid. In the apparatus of FIG. 2, the replenishment pump 22 is driven by manually operating the electric motor 23 while monitoring the liquid level with the level sensor 21, and the working fluid in the reserve tank 24 is supplied to the head pipe 17. Can be satisfied. In the apparatus of FIG. 3, when the electric motor 23 is started, the replenishment pump 22 is continuously operated to supply hydraulic fluid, and when the liquid level of the head pipe 17 rises to the position of the level switch 26, the level switch 26 is turned on. By working and stopping the motor 23, the head pipe 17 can be automatically filled with the working fluid.
[0032]
When the hydraulic pump 14 is operated by driving the electric motor 13, the hydraulic fluid in the head pipe 17 is sucked in by the suction line 20 and supplied to the hydraulic motor 12 through the hydraulic pressure supply line 16 a of the hydraulic pressure passage 16. Thus, the rotation of the cooling fan 4 is driven. The hydraulic fluid after driving the hydraulic motor 12 is returned to the lower portion of the head pipe 17 via the return line 16b. Further, the drain of the hydraulic motor 12 is sent to the head pipe 17 through a drain line 19 connected to the head pipe 17 at a position higher than the drain outlet 19 a of the hydraulic motor 12.
[0033]
At this time, the liquid level in the head pipe 17 does not change as long as there is no liquid leakage in the hydraulic flow path 16 or the like.
[0034]
As described above, the head pipe 17 extending to a position higher than the highest part of the hydraulic flow path 16 connected to the hydraulic motor 12 of the cooling fan 4 is provided, and the drain line 19 of the hydraulic motor 12 is connected to the hydraulic motor. 12 is connected to the head pipe 17 at a position higher than the drain outlet 19a. Therefore, even if the pressure in the return line 16b of the hydraulic pressure flow path 16 becomes lower than the atmospheric pressure, the hydraulic pressure flow path 16 is always in the interior. It will be filled with the working fluid of the head pipe 17, and inhalation of air is prevented. Therefore, the occurrence of problems such as rusting on the inner surface of the pipe due to air being sucked into the hydraulic flow path 16 and noise, vibration, etc. due to cavitation in the return line 16b during driving of the cooling fan 4 is prevented. Stable operation is possible.
[0035]
According to the above, if the height of the hydraulic pressure channel 16 is within the height of the liquid column (for example, within 10 meters), air inhalation can be prevented. When the height of the path 16 is about 20 meters, for example, a check valve 31 is arranged between the hydraulic pump 14 and the hydraulic motor 12 in the hydraulic pressure supply line 16a, and an intermediate position of the return line 16b. By disposing the pilot check valve 32 in the air, it is possible to prevent the inhalation of air by dividing the height of the hydraulic flow path 16 into upper and lower parts.
[0036]
[0037]
[0038]
[0039]
[0040]
[0041]
[0042]
[0043]
In addition, the cooling fan hydraulic pressure drive device of the cold water tower of this invention is not limited only to the form example mentioned above, Of course, it can add various changes within the range which does not deviate from the summary of this invention.
[0044]
【The invention's effect】
A cooling fan hydraulic pressure driving device for a chilled water tower according to the present invention is provided with a head pipe extending to a position higher than the highest part of a hydraulic pressure channel connected to the hydraulic motor of the cooling fan, and the drain line of the hydraulic motor is connected to the liquid pressure motor. A suction pipe and a return line of a hydraulic pump connected to the head pipe at a position higher than the drain outlet of the pressure motor, connected to the head pipe at a position higher than the drain outlet of the hydraulic motor , and provided in the hydraulic pressure supply line; Is connected to the lower portion of the head pipe, and is further provided at a position above the drain line connection portion of the head pipe to detect the liquid level in the head pipe, and to the head pipe according to the detection level of the level sensor. since a structure in which a supply pump connected to the lower portion of the head pipe so as to supply fluid, the pressure of the emergency hydraulic fluid path of the return in line to become the atmospheric pressure or less However, the inside of the hydraulic pressure channel is always filled with the working fluid of the head pipe, so that the intake of air is prevented. Or the occurrence of problems such as noise and vibration due to cavitation in the return line during driving of the cooling fan.
[0045]
When so as to automatically perform the supply of hydraulic fluid to the head pipe includes a level switch for starting and stopping of the supply pump in place of the level Rusensa, the effect of the supply of hydraulic fluid to the head pipe easily is there.
[0046]
[0047]
Furthermore, by arranging a check valve between the hydraulic pump and the hydraulic motor in the hydraulic supply line and arranging a pilot check valve in the middle position of the return line, the height of the hydraulic flow path is divided up and down As a result, air can be prevented from being sucked even in a high-temperature cold water tower.
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an example of an embodiment for carrying out the present invention.
FIG. 2 is a block diagram showing an outline of a hydraulic flow path of the embodiment of FIG.
FIG. 3 is a block diagram showing another example of a portion where hydraulic fluid is supplied to the head pipe in FIG. 2;
FIG. 4 is a schematic sectional view showing an example of a conventional cold water tower.
5 is a schematic sectional view showing a driving device of the cooling fan cooling tower of FIG.
[Explanation of symbols]
4 Cooling Fan 12 Hydraulic Motor 14 Hydraulic Pump 15 Power Unit 16 Hydraulic Flow Channel 16a Hydraulic Supply Line 16b Return Line 17 Head Pipe 18 Ventilation Port 19 Drain Line 19a Drain Outlet 20 Suction Line 21 Level Sensor 22 Replenishment Pump 24 Reserve Tank 26 Level switch
31 Check valve 32 Pilot check valve

Claims (3)

Chilled water tower cooling fan connected to a power unit installed on the ground side by a hydraulic pressure supply line and a return line of the hydraulic flow path connected to a cooling fan in the cooling water tower A head pipe having a length extending from the power unit position to a position higher than the highest part of the hydraulic flow path and having a vent at the upper end, and the drain line of the hydraulic motor is connected to the hydraulic motor. The head pipe is connected to the head pipe at a position higher than the drain outlet, and the suction line and the return line of the hydraulic pump provided in the hydraulic pressure supply line are connected to the lower part of the head pipe. A level sensor that detects the liquid level in the head pipe at a position above the line connection portion, and supplies the liquid to the head pipe according to the detection level of the level sensor. A cooling fan hydraulic drive apparatus of cooling tower, characterized in that a supply pump connected to the lower portion of the head pipe.   2. A cooling fan for a chilled water tower according to claim 1, wherein a check valve is arranged between the hydraulic pump and the hydraulic motor in the hydraulic pressure supply line, and a pilot check valve is further arranged at an intermediate position of the return line. Hydraulic drive device. A cooling fan hydraulic drive apparatus cooling tower according to claim 1, further comprising a level switch for starting and stopping of the supply pump in place of the level sensor.

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