JPH0961008A - Screw-refrigeration unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the size of a unit in depth and make the unit as a whole compact in terms of the floor space occupied thereby by arranging on a frame placed above a pressure vessel of a heat exchanger or liquid receiver a plurality of compressors and a horizontal type oil separator in joint use, in relation of their axes to the center of the pressure vessel, at arbitrary intervals frontward or rearward and in parallel. SOLUTION: A compressor 1 and a compressor 2 are placed in alignment on an identical line and a compressor 3 and a horizontal type oil separator 4, in alignment on another identical line each at an arbitrary interval frontward or rearward and in parallel in relation to the center of a condensor 6 and all in a well balanced state. That is to say, the axes of the No.1 compressor 1 and No.2 compressor 2 are placed on an identical line and the axes of the No.3 compressor 3 and the oil separator 4 in joint use, on another identical line and the respective axes of the No.1 and No.2 compressors are arranged at arbitrary intervals frontward or rearward and in parallel in relation to the center of the pressure vessel, so are the respective axes of the No.3 compressor 3 and oil separator 4. This constitution makes it possible to reduce the size of the unit in depth and make the unit as a whole compact in terms of the floor space occupied thereby so that the machine chamber can be made smaller or can be used more effectively.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a screw refrigerator.

[0002]

2. Description of the Related Art In the refrigerator unit described in Japanese Patent Application Laid-Open No. 1-217167, it is described that the axes of two compressors are arranged in parallel with each other in the front-rear direction with respect to the center of the container.

[0003]

In a large-capacity multi-type refrigerator unit equipped with three compressors, in the prior art, there is a technique in which the shaft center of the compressor is arranged in a direction perpendicular to the center of the pressure vessel. It has been generally adopted, but downsizing of the installation area has become a problem due to the shrinking of the machine room accompanying the rise in land prices.

An object of the present invention is to rationally mount a screw compressor long in the axial direction and to reduce the installation area of a refrigerator unit.

[0005]

In order to achieve the above-mentioned object, the present invention provides a gantry arranged on a pressure vessel of a heat exchanger or a liquid receiver, and a horizontal type shared with the shaft centers of a plurality of compressors. The axial center of the oil separator is arranged parallel to the center of the pressure vessel at an arbitrary interval in the front and rear.

[0006]

[Function] Two No.1 and No.2 compressors are arranged on the same line, and one No.3 compressor and one oil separator, which is shared, are arranged on the same line. No. 1 and No. 2 compressor axis and N
o.3 By arranging the axial centers of the compressor and the oil separator in parallel with the center of the pressure vessel at an arbitrary interval in the front and rear,
The depth dimension can be reduced and the installation area of the entire unit can be reduced. As a result, the machine room can be downsized or effectively utilized.

[0007]

1 is a plan view of a three-unit multi-type refrigerator unit according to an embodiment of the present invention.

FIG. 2 shows a right side view.

FIG. 3 is a cycle system diagram of a three-unit multi-type refrigerator unit according to an embodiment of the present invention.

The assembly structure of the unit will be described with reference to FIGS. The compressor 1 and the compressor 2 are arranged on the same line, the compressor 3 and the horizontal oil separator 4 are arranged on the same line, and they are arranged in parallel to the center of the condenser 6 at an arbitrary interval in the front-rear direction. It

The oil tank 7 and the oil cooler 8 are connected directly below the horizontal oil separator 4 by straight pipes 9 and 10, and are arranged concentrically with the condenser 6.

The pedestal 5 on which the compressors 1, 2 and 3 and the horizontal oil separator 4 are mounted may have an integral structure which is attached to the condenser 6 by welding or a structure which can be disassembled with the condenser 6.

Next, the cycle system diagram of FIG. 3 will be described.

The refrigerant gas which has passed through the suction strainers 11a, 11b and 11c and is sucked into the compressors 1, 2 and 3 is compressed and discharged into the discharge pipes 12a, 12b and 12c and the collecting pipe 13 and the discharge pipes 14a and 14b. Further, it enters the horizontal oil separator 4, passes through the oil separation devices 15a and 15b, and is discharged to the condenser 6 through the discharge pipe 16.

On the other hand, the oil 17 contained in the refrigerant gas is separated when passing through the oil separation devices 15a and 15b,
The oil is collected in the oil tank 7 through the oil pipe 9. The oil 17 in the oil tank 7 flows into the oil cooler 8 via the oil pipe 10 and is cooled to be supplied to the oil supply pipe 1
8a, 18b, 18c, oil strainer 19a, 1
9b, 19c and the oil solenoid valves 20a, 20b, 20c, and the compressor 1, from the oil supply ports 21a, 21b, 21c.
Oil is supplied to 2 and 3, respectively.

According to this embodiment, the depths of the compressors 1 and 2 and the compressor 3 and the oil separator are arranged parallel to the center of the pressure vessel at an arbitrary interval in the front-rear direction. It can be downsized and the installation area of the entire unit can be downsized.

As a result, the machine room can be downsized or effectively utilized.

[0018]

The three multi-type screw refrigerator unit according to the present invention has the following effects.

(1) Since the depth dimension of the refrigerator unit is reduced, the installation area can be greatly reduced, the space can be saved, and the installation cost can be reduced.

(2) The machine room in which the refrigerator unit is installed can be miniaturized or effectively utilized.

(3) The size of the frame on which the compressor is mounted can be reduced, and an inexpensive product can be provided.

(4) By disposing the oil tank and the oil cooler directly below the oil separator and concentrically with the condenser,
You can effectively use the space of the gantry.

(5) Since the units are arranged in a well-balanced unit structure, the unit as a whole can be stabilized.

[Brief description of drawings]

FIG. 1 is a plan view of a three-unit multi-type refrigerator unit according to an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a cycle system diagram of a three-unit multi-type refrigerator unit according to an embodiment of the present invention.

[Explanation of symbols]

1, 2, 3 ... Compressor, 4 ... Horizontal oil separator, 5 ... Stand, 6
... condenser, 7 ... oil tank, 8 ... oil cooler.

Claims (1)

[Claims] 1. A pressure vessel for a heat exchanger or a receiver for a plurality of compressors built in a casing by directly connecting motor elements of a stator and a rotor to compression elements of male and female screw rotors. In a screw refrigerator unit in which the shaft center of the compressor is arranged parallel to the center of the pressure vessel at an arbitrary interval in the front and rear on the gantry arranged above, the shaft centers of the two compressors are on the same line or close to each other. Disposed on a line, the axial center of the horizontal oil separator shared with the third compressor is disposed on the same line or an approximate line, and the axial centers of the two compressors, the third compressor and the The axial centers of the horizontal oil separators are arranged parallel to each other in the front-rear direction with respect to the center of the pressure vessel, and an oil tank and an oil cooler are connected directly under the horizontal oil separators by a direct pipe connection, A screw refrigerator unit which is arranged concentrically with a container.