JPH0111990Y2 - - Google Patents

Description

[Detailed description of the invention] The purpose of this invention is to reliably prevent the air temperature inside the package cage from rising when the rotary compressor, which operates intermittently, stops, in a package-type oil-cooled rotary compressor. This invention relates to an air temperature cooling device that occupies an open space inside a package in an oil-cooled rotary compressor with intermittent operation control.

A conventional oil-cooled rotary compressor is constructed into a package type, for example, as shown in FIG. 1, in consideration of protecting equipment and preventing noise generation.

However, in the conventional protection type using the package 2 in the oil-cooled rotary compressor 1, when the pressure switch 3 is activated and the operation of the rotary compressor 1 is stopped, the pulley of the electric motor 4 for rotating the rotary compressor 1 is damaged. Since the rotation of the cooling fan 6 directly connected to the rotating compressor 5 also stops, the air-cooling operation for the cooler 7 for cooling the lubricating oil supplied to the rotary compressor 1 stops.

For this reason, in the conventional package type, every time the operation of the rotary compressor 1 is stopped in connection with the operation of the pressure switch 3, the lubricating oil heated by the operation of the rotary compressor 1 and the rotary compressor 1 and Electric motor 4
Due to the temperature released to the outside, the temperature of the air occupying the open space inside the package 2 rises by about 20° C. in about 15 minutes. Therefore, if the outside air temperature is 40°C or higher (such as when used outdoors in summer), the temperature of the air inside the package 2 will be within the permissible range (generally 60°C or higher).
(°C or less) is often exceeded.

Therefore, if the temperature inside the package 2 rises above the allowable range, it will have a negative effect on the interior components, especially the electrical components that make up the electrical circuit, and this will accelerate the deterioration of the components and cause failure. There was a problem.

This invention was made by focusing on such conventional problems, and has an air intake port in the driver's cab and an exhaust port in the heat radiation chamber, and the driver's cab is equipped with an oil-cooled rotary compressor and an oil-cooled rotary compressor. An electric motor for driving an oil-cooled rotary compressor via a belt and an air tank are disposed, and a lubricating oil cooler is disposed in the heat dissipation chamber, and a cooler for lubricating oil is disposed in the heat radiation chamber. In the package type oil-cooled rotary compressor, the compressor is separated from the heat radiation chamber by a partition plate, and a ventilation window is formed in the partition plate to communicate the driver cab and the heat radiation chamber, and the compressor is disposed in the driver cab. An electric cooling fan that can be rotated separately from the oil-cooled rotary compressor is provided in the ventilation window adjacent to a cooler for circulating oil supplied to the oil-cooled rotary compressor, A temperature switch for rotating and stopping the electric cooling fan is provided at the upper inner wall where the air temperature is high, and a temperature switch for rotating and stopping the electric motor for driving the rotary compressor is installed on the upper inner wall of the air tank. The electric cooling fan is rotated and stopped at the same time as the electric motor is rotated and stopped through an auxiliary contact of an electromagnetic switch that cuts off the supply of current to the electric motor for driving the rotary compressor. The electric cooling fan that is stopped by the auxiliary contact further constitutes an electric circuit that can be rotated and stopped by turning on and off the temperature switch, and is heated not only when the rotary compressor is in operation but also when the rotary compressor is stopped. The structure is such that the air occupying the open space inside the package cage can be reliably cooled.
The purpose is to solve the above problems.

Next, this invention will be explained based on the drawings.

FIG. 2 shows an example of the internal structure of a package type oil-cooled rotary compressor according to this invention.

Note that the same members as shown in FIG. 1 are given the same reference numerals, and redundant explanation will be omitted.

First, to explain the configuration, the operation of the oil-cooled rotary compressor 1 is carried out by being transmitted via the belt 5a of the rotary pulley 5 of the electric motor 4, and the compressed air discharged from the rotary compressor 1 is transmitted to the air tank (oil separator tank). )8.

The air tank 8 is provided with a pressure switch 3, a safety valve 3a, an air outlet 3b, etc. at the top. A connecting pipe (not shown) for use with compressed air is attached to the air outlet 3b, and the pressure switch 3 detects the pressure inside this connecting pipe. The oil mixed in the discharged air is separated and stored in the lower part of the air 8. The oil stored here is sent to the cooler 7 side as lubricating oil from the circulation line 9, and the lubricating oil cooled here is sent to the rotary compressor 1 via the circulation line 10, filter 11, and control valve 12. Supplied.

In the above, the cooler 7 is a heat dissipation chamber 1 that is separated from the driver's cab 14 by a partition plate 13 of the package cage 2.
The ventilation window 13 of the partition plate 13 is disposed on the 5 side, facing the cooler 7 and facing the driver's cab 14 side.
One electric cooling fan 16 is provided oppositely at position a.

In the electric cooling fan 16, when the start switch 17 is turned on as shown in FIG. 3, the electric motor 4 is driven via the pressure switch 3, and at the same time, the auxiliary contact 18 of the electric motor 4 is turned on.
This allows the electric cooling fan 16 to rotate simultaneously with the rotation of the electric motor 4.

Therefore, by driving the electric motor 4, the rotary compressor 1
is operated, compressed air is accumulated in the air tank 8, and when the pressure in the air tank 8 reaches the set pressure of the pressure switch 3, the pressure switch 3 is turned off to stop driving the electric motor 4, and the rotary compressor 1 operation stops.

Next, when the pressure inside the air tank 8 is reduced by using the compressed air, the pressure switch 3 is turned on again and the above operation is repeated intermittently.

On the other hand, in the operation of the rotary compressor 1, since the lubricating oil heated by the compression action of the rotary compressor 1 lubricates the cooler 7, the operation of the rotary compressor 1 is stopped due to heat radiation from the circulation paths 9 and 10. The temperature of the air occupying the open space in the rear package 2 increases.

In the above, when the temperature rise of the air occupying the open space inside the package 2 reaches the operating setting value of the temperature switch 19 provided at a position in the package where the air temperature is high, this temperature switch 19 is turned on, and the pressure switch 3 is turned on. The electric cooling fan 16 can rotate while the rotary compressor 1 is stopped. Therefore, the heated air in the driver's cab 14 is transferred to the heat radiation chamber 15 through the electric cooling fan 16 and the cooler 17 by the air sucked through the cooling intake port 2 a of the driver's cab 14 of the package 2 . It is discharged to the outside of the package 2 from the exhaust port 2b. Therefore, the temperature of the air occupying the open space inside the package 2 can be automatically cooled. Further, the rotation of the electric cooling fan 16 continues until the temperature of the air inside the package 2 decreases to reach the off set value of the temperature switch 19 and the temperature switch 19 is turned off.

The temperature switch 19 is installed at a position in the package 2 where the temperature of the air is high (inside the upper part of the driver's cab 14 in the figure).

In addition, 2a is an intake port for cooling air that occupies the open space inside the package, which is provided on the side of the package 2 with a filter interposed therebetween, and 2b is an exhaust port, which is similarly provided at the top of the other end of the package 2. be.

According to this invention, one electric cooling fan 16 is installed in the package 2 so that it can be driven to rotate separately from the rotation of the rotary compressor 1. Even if the rotation of the electric cooling fan 16 stops, the electric cooling fan 16 can independently rotate for cooling through the energization operation of the temperature switch 19. Therefore, the inside of the package 2 can be cooled even when the rotary compressor is stopped, and since the electric cooling fan 16 is installed opposite the lubricating oil cooler 7 in the above-mentioned cooling, it can be cooled while cooling the air inside the package 2. The container 7 can be forcibly cooled.

The above cooling by the electric cooling fan 16 is performed when the temperature of the air inside the package 2 is changed to a temperature switch 19.
Since the electric cooling fan 16 is configured to stop rotating when the temperature reaches the off setting value or less, the inside of the package 2 is not overcooled by the electric cooling fan 16, and the electric cooling fan 1
6 can save power consumption.

As explained above, according to this idea,
The electric cooling fan can cool and rotate independently of the drive of the rotary compressor through the operation of the temperature switch, even when the air temperature inside the package is not only during operation of the rotary compressor but also when intermittent operation is stopped. This eliminates the problem of premature deterioration of electrical components due to the rise in air temperature in the package when the rotary compressor stops, which was a problem in the past. It is possible to eliminate failures in the rotary compressor due to a rise in the temperature of the air occupying the open space within the package in the rotary compressor. Additionally, electric cooling fans run only when needed, saving energy.

Further, according to this invention, the construction is extremely simple, so the cost of the cooling device can be kept low, and it is also quite easy to handle.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is an explanatory diagram of a cooling device in a package type oil-cooled rotary compressor showing an embodiment of this invention, and Fig. 3 is an electric circuit diagram of the cooling device. . 1...Rotary compressor, 2...Package, 3...
Pressure switch, 4...Electric motor, 7...Cooler, 1
6... Electric cooling fan, 18... Auxiliary contact, 19
...Temperature switch.

Claims (1)

[Scope of utility model registration request] The driver's cab has an intake port and the heat radiation chamber has an exhaust port, and the driver's cab includes an oil-cooled rotary compressor and a rotary compressor driving electric motor that drives the oil-cooled rotary compressor via a belt. Further, a lubricating oil cooler is disposed in the heat radiation chamber, and the driver's cabin and the heat radiation chamber are separated by a partition plate, and the driver's cabin is connected to the partition plate. In a package-type oil-cooled rotary compressor formed with a ventilation window communicating with the heat dissipation chamber, the compressor is located close to a cooler for lubricating oil supplied to the oil-cooled rotary compressor disposed in the operator's cab. An electric cooling fan that can rotate separately from the oil-cooled rotary compressor is installed in the ventilation window, and the electric cooling fan rotates and rotates at a position on the upper inner wall where the air temperature is high in the driver's compartment. In addition to providing a temperature switch that can stop the rotary compressor, the motor for driving the rotary compressor is rotated and stopped through a pressure switch attached to the upper part of the air tank, and the electric cooling fan is rotated and stopped by the pressure switch that is attached to the top of the air tank. The electric cooling fan, which is stopped by the auxiliary contact, also turns on and off the temperature switch through the auxiliary contact of the electromagnetic switch that supplies and cuts off the current to the rotary compressor driving electric motor. 1. A cooling device for cooling the air temperature inside a package in a package-type oil-cooled rotary compressor with intermittent operation control, characterized by comprising an electric circuit that can rotate and stop the compressor.