JPH058969A - Cooling device for hydraulic elevator - Google Patents

Abstract

PURPOSE:To cool working oil and a heat sink mounted with a semiconductor element for drive control of an elevator by a single forced cooling means. CONSTITUTION:In a heat sink 45, a part mounted with a semiconductor element of a drive control circuit for drive control of an elevator is received in a control board 43 of closed construction in the closed condition, and a cooling fin part 45a to form a wind passage of duct-shape and extending up and down is exposed outside the control board 43. Further, a single fan 42 is arranged between a radiator 44 and the fin part 45a, on the route connecting the radiator 44 and the fin part 45a, and when at least either the temperature of working oil or the temperature of the heat sink 45 detected with an oil temperature sensor 31 and a thermostat 33 is over a setting value, air is sent upward with the single fan 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a hydraulic elevator, and more particularly to an improvement of a device for cooling hydraulic oil and a control panel of the hydraulic elevator.

[0002]

2. Description of the Related Art As a conventional cooling device for a hydraulic elevator of this type, there is a technique disclosed in Japanese Utility Model Publication No. 1-78671.

FIG. 6 is a circuit diagram showing a conventional hydraulic elevator cooling device, FIG. 7 is a circuit diagram showing a detecting portion of a conventional hydraulic elevator cooling device, and FIG. 8 is a plan view showing a conventional hydraulic elevator cooling device. FIG. 9 is a right side view showing a conventional hydraulic elevator cooling device, and FIG. 10 is a front view showing a conventional hydraulic elevator cooling device.

In FIG. 6, 1 is a switch connected to a three-phase AC power source (not shown), 2 is a contactor connected to the switch 1 and operated when the elevator is driven, 3 is the switch 1
And a drive control circuit connected to the three-phase AC power supply via the contactor 2, 4 is a converter in the drive control circuit 3, 5 is an inverter in the drive control circuit 3, and 6 is rotation controlled by the drive control circuit 3. Three-phase induction motor, 7 is an oil tank that stores hydraulic oil, 8 is a drive pump that is driven by the three-phase induction motor 6 to suck and discharge the hydraulic oil in the oil tank 7, and 9 is a flow rate connected to the pump 8. A hydraulic circuit having a control valve (not shown), 10 is a cylinder filled with hydraulic oil, 11 is a plunger inserted in the cylinder 10, and 12 is a car directly connected to the plunger 11.

8 to 10, reference numeral 21 is a casing for accommodating the three-phase induction motor 6 and the oil tank 7, and 22 is connected to the oil tank 7 in the casing 21 to suck and discharge hydraulic oil. A circulation pump that circulates in the oil tank 7 and a radiator 23 as an oil cooling unit through which the hydraulic oil discharged from the pump 22 passes. The radiator 23 forms an air passage in the left-right direction by its fins so as to allow the air to be blown from the left side to the right side indicated by the arrow in the figure. Further, 24 is a fan as a forced cooling means for blowing air from the left side to the radiator 23 to forcibly cool the working oil in the radiator 23, and 25 is mounted with various semiconductor elements such as the converter 4 and the inverter 5 of the drive control circuit 3 A heat sink, 26 is a control panel housing a heat sink 25 having the drive control circuit 3 mounted, and 27 is a control panel 2
A fan serving as a forced cooling unit that is housed in the lower part of 6 and blows air to the heat sink 25 to forcibly cool it, and 28 is a ventilation hole formed on the upper surface of the control panel at a position corresponding to the heat sink.

In FIG. 7, 31 is an oil temperature sensor as a detecting means for detecting the hot water temperature of the hydraulic oil, one end of which is connected to the positive side of the DC power source. Reference numeral 32 is a relay having one end connected to the other end of the oil temperature sensor 31 and the other end connected to the negative side of the DC power source. It operates by the detection signal. A thermostat 33 is provided on the heat sink 25 and serves as a detecting means for detecting the temperature of the heat sink 25. One end of the thermostat 33 is connected to the positive side of the DC power source. Reference numeral 34 is a relay, one end of which is connected to the other end of the thermostat 33 and the other end of which is connected to the negative side of the DC power supply. On the other hand, in FIG. 6, reference numeral 32a denotes a contact point of the relay 32, which connects the switch 1 to the circulation pump 22 and the fan 24 for cooling the hydraulic oil. Further, 34a is a contact point of the relay 34, which connects the switch 1 and the fan 27 for cooling the heat sink 25.

Next, the operation of the conventional cooling device for a hydraulic elevator constructed as described above will be described.

First, when the switch 1 is turned on, the contactor 2 is turned on, and the electric power is supplied from the three-phase AC power source, the drive control circuit 3 drives the three-phase induction motor 6 and the drive pump 8. The hydraulic oil is sent from the oil tank 7 to the cylinder 10 via the hydraulic circuit 9, and the plunger 11 rises and the car 12 rises.

Here, when the elevator is driven up and down as described above, since the drive control circuit 3 is composed of various semiconductor elements, heat is generated due to the loss when these semiconductor elements operate, and the heat is generated. Is transmitted to the heat sink 25 and radiated from the heat sink 25. At this time, when the thermostat 33 on the heat sink 25 detects a temperature equal to or higher than the set value, the relay 34 operates and its contact 34
Turn on a. As a result, the fan 27 for cooling the heat sink 25 provided below the heat sink 25 is driven, and air is blown to the heat sink 25 for forced cooling.

When the elevator is driven up and down, the working oil moves between the oil tank 7 and the cylinder 10 via the drive pump 8 and the hydraulic circuit 7, and the loss at that time causes heat generation. When the oil temperature sensor 31 detects a temperature equal to or higher than the set value, the relay 32 operates to turn on the contact 32a. As a result, the circulation pump 22 is driven to discharge the hydraulic oil from the oil tank 7 to the radiator 23, and the fan 24 for cooling the hydraulic oil is driven to blow air from the left side to the right side as shown by the arrow in FIG. The hydraulic oil passing through the radiator 23 is forcibly cooled.

[0011]

As described above, the conventional hydraulic elevator cooling device cools the hydraulic oil by the radiator 23 when the temperature of the hydraulic oil reaches or exceeds the set value.
Various semiconductor elements of the drive control circuit 3 of the elevator are mounted on the heat sink 25, and the heat sink 25 is cooled when the elevator is driven. That is, the conventional hydraulic elevator cooling device separately detects and cools the hydraulic oil temperature and the heat sink temperature.
When the oil temperature of hydraulic oil is above the set value, or the control panel 26
When the temperature of the heat sink 25 therein is equal to or higher than a set value, a cooling oil cooling fan 24 or a heat sink 25 cooling fan 27 provided separately is driven to cool them. In other words, since two independent forced cooling means are required, the structure for cooling becomes large.
Further, when the fan 27 in the control panel 26 is driven, dust enters the control panel 26 through the ventilation holes 28 and the like, and in this case, it is difficult to clean the dust that has entered the control panel 26.

Therefore, the present invention provides a cooling apparatus for a hydraulic elevator, in which cooling of hydraulic oil and cooling of a heat sink having a semiconductor element for controlling drive of an elevator are performed by a single forced cooling means. Is an issue.

[0013]

A cooling device for a hydraulic elevator according to the present invention accommodates a portion of a heat sink on which a semiconductor element for drive control of an elevator is mounted in a control panel and forms a duct-shaped cooling device. Of the fins are exposed to the outside of the control panel, while a single forced cooling means is arranged on the path connecting the oil cooling section and the fins, and the first detection means and the second detection means are used. When at least one of the detected oil temperature of the operating oil and the temperature of the heat sink is equal to or higher than the set value, the single forced cooling means blows air in the direction from the fin portion to the oil cooling portion.

[0014]

In the present invention, when at least one of the oil temperature of the working oil and the temperature of the heat sink detected by the first detecting means and the second detecting means is equal to or higher than the set value, the single forced cooling means is operated and the fins are operated. Blows air in the direction from the section toward the oil cooling section. At this time, since the fin portion, the forced cooling means and the oil cooling portion are on the same path, the working oil in the oil cooling portion is forcedly cooled by the air blown from the forced cooling means, while the direction of the oil cooling portion by the forced cooling means is increased. Along with the blowing of air, an airflow toward the oil cooling section is generated in the air passage of the duct-shaped fin portion to blow air, and the heat sink is forcibly cooled via the fin portion.

[0015]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a circuit diagram showing a cooling device for a hydraulic elevator according to an embodiment of the present invention, FIG. 2 is a circuit diagram showing a detecting portion of a cooling device for a hydraulic elevator according to an embodiment of the present invention, and FIG. FIG. 4 is a plan view showing a hydraulic elevator cooling device of an embodiment of the invention, FIG. 4 is a right side view showing a hydraulic elevator cooling device of an embodiment of the present invention, and FIG. 5 is a hydraulic elevator of an embodiment of the present invention. It is a front view which shows a cooling device.

It should be noted that, in the drawings, the same reference numerals and symbols as those of the conventional example indicate the same or corresponding parts as those of the conventional example, and therefore, redundant description will be omitted here.

In FIGS. 1 and 2, reference numeral 41 denotes a relay having one end connected to the oil temperature sensor 31 and the thermostat 33 and the other end connected to the negative side of the DC power source, and at least the oil temperature sensor 31 and the thermostat 33. It operates when one of the temperatures exceeds the set value. Reference numeral 41a is a contact of the relay 41, and 42 is a fan as a single forced cooling means connected to the three-phase AC power source through the switch 1 and the contact 41a. The circulating pump 22 is attached to the contact 32a of the relay 32 operated by the oil temperature sensor 31.
Only connected.

In FIG. 3, 43 is a control panel having a closed structure, 44 is fixed above the housing 21 and the control panel 43, and a radiator as an oil cooling section through which the hydraulic oil discharged from the circulation pump 22 passes. Is. The radiator 44 has an air passage formed in the vertical direction by its fins so as to allow the air to be blown from the lower side to the upper side indicated by the arrow in the figure. Further, 45 is a heat sink in which the semiconductor elements such as the converter 4 and the inverter 5 are mounted in the control panel 43 in a hermetically sealed state, and 45 a is a fin portion for cooling the heat sink 45, which is external to the control panel 43. Is exposed to. The fin portion 45a is the casing 21.
And a control panel 43, and a duct-structured air passage extending in the up-down direction is formed so as to allow air to be blown from the lower side to the upper side indicated by the arrow in the drawing. The fan 42 is arranged between the radiator 44 and the fin portion 45a and on the path connecting the radiator 44 and the fan portion 45a of the heat sink 45, and the direction from the fin portion 45a to the radiator 44 is increased. That is, the air is blown from the lower side to the upper side. In addition, the fin portion 45
The upper end of a extends to the vicinity of the fan 42.

Next, the operation of the cooling apparatus for the hydraulic elevator of the present embodiment constructed as described above will be explained.

First, when the elevator is driven up and down, the working oil moves between the oil tank 7 and the cylinder 10 via the drive pump 8 and the hydraulic circuit 9, and the loss at that time causes heat generation. Here, when the oil temperature sensor 31 detects the oil temperature of the hydraulic oil in the oil tank 7 which is equal to or higher than the set value, the relay 32 operates to turn on the contact 32a. As a result, the circulation pump 22 is driven to discharge hydraulic oil from the oil tank 7 to the radiator 44, and the fan 42 is driven to blow air upward as shown by the arrow in FIG.
Cool the hydraulic fluid passing through 4.

When the elevator is driven up and down, since the drive control circuit 3 is composed of various semiconductor elements, heat is generated due to loss when these semiconductor elements operate, and the heat is transmitted to the heat sink 45. Then, the heat is dissipated from the heat sink 45. At this time, the heat sink 45
When the upper thermostat 33 detects the surface temperature of the heat sink 45 and detects a temperature higher than the set value, the relay 41
Operates to turn on its contact 41a. As a result, the fan 42 is driven to blow air upward toward the radiator 44. At this time, the fin portion 45a, the fan 42, and the radiator 44 are on the same path. In addition, the heat sink 45 is provided from the control panel 43 to the fin portion 45.
The air passage is formed as a duct structure extending in the vertical direction while the fins 45a are mounted so that only a is exposed to the outside and the upper ends of the fins 45a are located directly below the fan 42. Therefore, as the fan 42 blows air to the upper radiator 44, an upward airflow is generated in the air passage of the fin portion 45a to blow air, and simultaneously with the forced cooling of the hydraulic oil in the radiator 44 by the fan 42, Fin part 4
Forced cooling of the heat sink 45 is performed via 5a. As a result, the forced cooling of the hydraulic oil in the radiator 44 and the forced cooling of the heat sink 45 are performed by the single fan 4
2 can be used. Further, since the fin portion 45a of the heat sink 45 is exposed to the outside and only the mounting portion of the semiconductor element is accommodated in the control panel 43 and the control panel 43 has a closed structure, it is difficult for dust to enter the control panel 43. .

As described above, in the hydraulic elevator cooling apparatus of the above-described embodiment, the portion of the heat sink 45 on which the semiconductor element of the drive control circuit 3 for controlling the drive of the elevator is mounted is hermetically sealed in the control panel 43 having a hermetic structure. And a fin portion 45a for cooling which forms a duct-like air passage extending in the vertical direction is exposed to the outside of the control panel 43, while a single fan 42 is connected to the radiator 44 and the fin portion 45a. Between the radiator 44 and the fin portion 4
5A, the single fan 42 moves upward when at least one of the oil temperature of the hydraulic oil detected by the oil temperature sensor 31 and the thermostat 33 and the temperature of the heat sink 45 is equal to or higher than a set value. It is to blow air.

Therefore, in the above embodiment, when at least one of the oil temperature of the hydraulic oil and the temperature of the heat sink 45 is equal to or higher than the set value, the single fan 42 is driven and the fin portion 4 is driven.
Air is blown upward from 5a toward the radiator 44. At this time, since the fin portion 45a, the fan 42, and the radiator 44 are on the same path, the working oil in the radiator 44 is forcibly cooled by the air blown from the fan 42, while the fan 42 blows the air upward. , In the air passage extending in the vertical direction of the duct-shaped fin portion 45a,
An air flow is generated upwards to blow air, and the fin portion 4
The heat sink 45 is forcibly cooled via 5a. As a result, the forced cooling of the hydraulic oil in the radiator 44 and the forced cooling of the heat sink 45 can be performed using the single fan 42, and the device can be downsized and the device price can be reduced. can do. In addition, since the dust and the like are not sucked into the control panel 43 due to the forced cooling by the fan 42, it is not necessary to clean the inside of the control panel 43.

By the way, the heat sink 45 of the above embodiment.
The cooling fin portion 45a of itself has a duct shape and forms an air passage extending in the up-and-down direction. However, the present invention is not limited to this, and the fan 42 is not limited to this. As long as the air is blown to the radiator 44, an air flow is generated in the air passage to blow the air, and the heat sink 45 may be cooled via the fins 45a. For example, separately from the fin portion 45, the fin portion 45a
It is also possible to form ducts that extend in the vertical direction by attaching ducts that surround the four sides. However, the fin part 4
When 5a itself is formed into a duct shape,
It is possible to obtain an effect that the configuration of the entire device becomes compact.

[0026]

As described above, according to the cooling apparatus for a hydraulic elevator of the present invention, the portion of the heat sink on which the semiconductor element for controlling the drive of the elevator is mounted is housed in the control panel, and the duct-like cooling is provided. Of the first fin is exposed to the outside of the control panel, while a single forced cooling unit is arranged on the path connecting the oil cooling unit and the fin unit.
When at least one of the oil temperature of the working oil and the temperature of the heat sink detected by the detection means and the second detection means is equal to or higher than a set value, the single forced cooling means blows air in a direction from the fin portion toward the oil cooling portion. Is to do. Therefore, when at least one of the oil temperature of the working oil and the temperature of the heat sink detected by the first detection means and the second detection means is equal to or higher than the set value, the single forced cooling means is operated and the fin portion changes to the oil cooling portion. The air is blown in the direction. At this time, since the fin portion, the forced cooling means and the oil cooling portion are on the same path, the working oil in the oil cooling portion is forcedly cooled by the air blown from the forced cooling means, while the direction of the oil cooling portion by the forced cooling means is increased. Along with the blowing of air, an airflow toward the oil cooling section is generated in the air passage of the duct-shaped fin portion to blow air, and the heat sink is forcibly cooled via the fin portion. As a result, the forced cooling of the hydraulic oil in the oil cooling section and the forced cooling of the heat sink can be performed using a single forced cooling means, and the apparatus can be downsized and the apparatus price can be reduced. Can be

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a cooling device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a detector of a cooling device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 3 is a plan view showing a cooling device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 4 is a right side view showing a cooling device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 5 is a front view showing a cooling device for a hydraulic elevator according to an embodiment of the present invention.

FIG. 6 is a circuit diagram showing a conventional cooling device for a hydraulic elevator.

FIG. 7 is a circuit diagram showing a detection unit of a conventional hydraulic elevator cooling device.

FIG. 8 is a plan view showing a conventional hydraulic elevator cooling device.

FIG. 9 is a right side view showing a conventional hydraulic elevator cooling device.

FIG. 10 is a front view showing a conventional cooling device for a hydraulic elevator.

[Explanation of symbols]

 4 Converter (Semiconductor Element) 5 Inverter (Semiconductor Element) 31 Oil Temperature Sensor (First Detection Means) 33 Thermostat (Second Detection Means) 42 Fan (Forced Cooling Means) 43 Control Panel 44 Radiator (Oil Cooling Section) 45 Heat Sink 45a Fin part

Claims (1)

Claim: What is claimed is: 1. An oil cooling unit for cooling hydraulic oil, a control panel for controlling a hydraulic elevator, and a portion on which a semiconductor element for elevator drive control is mounted is housed in the control panel. In addition, a heat sink having a duct-shaped cooling fin portion exposed to the outside of the control panel, first detecting means for detecting the oil temperature of the hydraulic oil, and second detecting means for detecting the temperature of the heat sink. And disposed on a path connecting the oil cooling unit and the fin unit, and when at least one of the oil temperature and the temperature of the heat sink is equal to or higher than a set value, blows air in a direction from the fin unit to the oil cooling unit. A cooling device for a hydraulic elevator, comprising a single forced cooling means for performing the cooling.