JPH062961A - Refrigeration equipment oil separator - Google Patents

Abstract

(57) [Summary] [Structure] The oil separator has a cylindrical closed container 1 and an oil separation mechanism part in the upper part thereof, and the separator separates oil when passing through a horizontal element part. To do. The closed container 1 has a refrigerant gas inlet, a supply pipe 6'for supplying the separated oil 5 to the compressor, a cooling device 8 for cooling the supply pipe 6 ', and a pressure in the oil separator 4 It is composed of a combination of temperature detection sensors 14 and 15. The capacity of the cooling device 8 can be controlled by using outputs from the pressure sensor 14 and the oil temperature sensor 15. [Effect] Even if the pressure fluctuation in the oil separator during the start-up operation of the refrigeration system or a sudden temperature change occurs, when the separated oil flows in the supply pipe that supplies the compressor bearing portion,
The refrigerant in the oil does not evaporate and no gas is generated because it is cooled from the surface of the piping to achieve a heat insulating effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil separator for a refrigeration system equipped with a mechanism suitable for separating refrigeration oil mixed in high pressure refrigerant gas discharged from a compressor in a refrigeration cycle of the refrigeration system. Regarding

[0002]

2. Description of the Related Art Conventionally, as an oil separator of this type, as shown in FIG. 1, a refrigerant gas inlet pipe 2 and an upper outlet pipe 3 are connected to a closed container 1, respectively. As a separating mechanism, a demister 4 which is an element in which thin wire wires for separating oil are spread is arranged.

Refrigerant gas (arrow A) discharged from the compressor of the refrigerating apparatus enters the closed container 1 through the inlet pipe 2 and is discharged to the (arrow B) side of the discharge pipe 3 through this gas demister 4. When passing through the demister 4, the oil particles of the mist come into contact with the demister 4 and are collected at that time, and the oil particles develop and become large and fall by their own weight to be separated from the refrigerant gas. Reference numeral 5 indicates the separated oil, and 6 is the oil drain port.
In addition, as described in Japanese Utility Model Publication No. 3-41241,
This is a combination of an oil separation mechanism that utilizes the side surface of the closed container and a mechanism that separates the oil when passing through the demister.

An oil separator of this type having a conventional structure is
There is a mechanism for returning the oil into the compressor from the bottom side of the separated oil sump or by inserting the tip of the pipe into the bottom side of the oil.

[0005]

In the oil separator of the prior art, the oil that enters the closed container from the inlet pipe 2 and is introduced into the element 4 together with the refrigerant gas collides with the wall when entering the element 4. Fine mist-like particles develop into large particles due to phenomena such as expansion and diffusion, and the oil is separated by falling to the bottom due to its own weight. The separated oil is returned to the compressor as a lubricating oil of the compressor by a differential pressure. The position for returning the oil is generally a mechanism for returning to the suction chamber (low pressure side) of the compressor. Therefore, in the conventional mechanism, the bearing is returned to the vicinity of the bottom of the closed container, and then the bearing is fed from the centrifugal oil feed hole provided in the crankshaft. In the mechanism, since the refrigerant dissolved in the oil evaporates and the phenomenon occurs, the volume in the container is large, so even if the refrigerant evaporation phenomenon occurs, gas is not supplied to the bearing part. . However, in the structure where there is no oil sump in the closed container of the compressor and oil is directly supplied to each bearing from the oil supply port provided at the lower part of the crankshaft of the drive unit (external oil supply method), the pressure and temperature inside the oil separator are The refrigerant dissolved in the oil separated by the change absorbs heat from the piping surface in the supply pipe for supplying the oil from the oil separator to the crankshaft of the compressor, and the refrigerant evaporates. This caused a phenomenon in which the lubrication hole of the shaft was blocked by gas and oil could not be replenished, resulting in a burnout accident of the bearing. An object of the present invention is to provide a mechanism capable of preventing a serious burnout accident of a bearing portion by creating a condition in which a refrigerant dissolved in oil does not evaporate even if a change in pressure and temperature in the oil separator occurs. To provide.

[0006]

An oil separator according to the present invention comprises a supply pipe section for supplying separated oil to a bearing section of a compressor.
By providing a mechanism that suppresses evaporation of the refrigerant by cooling, an external supply mechanism that can reliably supply oil can be achieved.

[0007]

The refrigerant gas discharged from the compressor enters the airtight container of the oil separator, and when the refrigerant gas passes through the inside of the element, the refrigerant gas expands and diffuses to separate the oil. The separated oil falls and accumulates at the bottom of the closed container due to its own weight. The accumulated oil is directly connected from the bottom of the closed container to the oil supply hole provided in the bottom of the crankshaft in the bearing of the compressor, and the oil is supplied using the differential pressure between the oil separator and the compressor (hereinafter referred to as differential pressure oil supply). Oil) to the bearing. The bottom of the oil separator and the oil supply hole provided at the bottom of the compressor crankshaft are directly connected. Although this pipe is called a supply pipe, when oil flows through the supply pipe portion, the heat of the outside air temperature is taken from the surface of the pipe and the melted refrigerant is evaporated. Therefore, in order to obtain a temperature condition in which the refrigerant does not evaporate, an optimal temperature condition can be obtained by providing a mechanism that detects the pressure and temperature in the oil separator and controls the ability of the cooling device to cool the supply pipe section. This makes it possible to employ a highly reliable external oil supply system.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIG. 2 shows an embodiment of the present invention, and FIGS. 3 and 4 show an application example of the oil supply pipe cooling device of the present invention.
FIG. 5 shows a working layout of the oil separator of the present invention used in a refrigeration cycle. An embodiment of the present invention will be described with reference to FIG. Reference numeral 1 denotes a main body of the oil separator, 2 denotes a refrigerant gas suction port, 3 denotes a discharge port, 4 denotes a demister which is a separating element, and 5 denotes separated oil. The structure is such that it is returned from the oil drain port 6 to the compressor by a supply pipe 6 '. 7 is a foot for fixing,
8 is a cooling device for cooling the oil pipe, 9 is a compressor body, 10 is a refrigerant inlet port, 11 is a refrigerant outlet port, and from here to the inlet port of the oil separator 1. , 12 are feet for fixing, and 13 is a base for fixing the feet.

Next, the operation will be described. The refrigerant gas compressed by the compressor 9 is discharged from the refrigerant discharge port 11 and advances in the direction of the arrow to enter from the refrigerant suction port 2 of the oil separator 1 and when passing through the demister 4, it is collided, diffused, and expanded by a powder mist. Oil is separated and falls by gravity. The separated oil 5 is supplied from the oil drain port 6 to the compressor 9 through the supply pipe 6'by a differential pressure. The supplied oil temperature is the supply pipe 6 '.
When the temperature exceeds the set temperature, the cooling water 18 flows to cool the oil. The temperature of the oil inside the oil separator is detected by the temperature sensor 15, the pressure inside the oil separator is detected by the pressure sensor 14 so that the refrigerant dissolved in the oil does not evaporate, and the detected signal is sent to the controller 16. It is a mechanism for inputting and controlling the adjusting valve 17 for adjusting the flow rate of the cooling water 14 according to the signal. Next, FIGS. 3 and 4 show an application example of cooling oil. FIG. 3 shows a structure having fins 8'for improving heat exchange on the surface of the supply pipe 6 ', which is a mechanism for cooling at the outside air temperature. FIG. 4 shows the fin 8 ′ shown in FIG.
The attached supply pipe is further provided with a mechanism for forcibly sending air by the fan 8A to improve the efficiency of heat exchange in order to improve the cooling effect. The rotation speed of the fan 8A is provided with a mechanism that can be controlled by the oil temperature and pressure inside the oil separator 1.
Although not shown here, a double pipe type may be used, and the inside is an oil passage and the outside is a mechanism for flowing cooling water, or the outside of the double pipe is an oil passage and the inside is a cooling pipe. A water passage structure may be used. The cooling device may have a constant cooling capacity regardless of the temperature and pressure in the oil separator.

FIG. 5 shows how the oil separator is used in the refrigeration cycle. The flow of the refrigeration cycle and the function of the oil separator will be described with reference to FIG. Reference numeral 9 is a refrigerant compressor for compressing the refrigerant, 2 is a discharge pipe for the compressed high pressure refrigerant gas, 3 is an oil separator for separating oil contained in the discharged refrigerant gas, Is a separated oil, 19 is a condenser for converting the high-pressure refrigerant gas into a liquid refrigerant, 18 is cooling water for cooling, and 22 is a pressure reducing valve for expanding the liquid refrigerant, that is, an expansion valve. In this case, however, the low-pressure liquid refrigerant enters the heat exchanger 20 and removes the heat of the outside air sent from the fan 21, and the low-pressure liquid refrigerant rises in temperature and evaporates to return to the compressor as a complete gas.
This circulation is called a refrigeration cycle. In this refrigeration cycle, the oil (refrigerator oil) discharged from the compressor together with the refrigerant gas is separated by the oil separator 4 (FIG. 2). The separated oil 5 drops to the bottom and is returned to the compressor by differential pressure oil supply through the supply pipe 6 '. When the heat of the outside air is absorbed in this supply pipe section, the liquid refrigerant dissolved in the oil 5 evaporates, so that the gas is clogged in the oil supply hole of the bearing section of the compressor 9 and it becomes impossible to refuel and the bearing section suffers a burnout accident. . The present invention has invented a mechanism capable of cooling the supply pipe so that the refrigerant does not evaporate when the oil 5 is supplied. Reference numeral 8 denotes a cooler, and 18 denotes cooling water for cooling. Cooling water 18
As described above, is equipped with a mechanism capable of controlling the amount of water by the pressure and temperature inside the oil separator.

[0011]

According to the oil separator of the present invention, it is possible to reliably return the separated oil to the compressor regardless of the operating conditions of the compressor, so that there is no accidental burnout of the bearing of the compressor. . Further, since the oil can be returned to the two compressors and supplied to the bearings with one oil separator, the cost of the refrigeration cycle apparatus can be reduced.

In particular, for operation of a complicated multi-refrigeration cycle device, a device without oil rising can be obtained.

[Brief description of drawings]

1 is a cross-sectional view of a prior art oil separator.

FIG. 2 is a system diagram of an oil separator according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an application example of a cooling device for an oil return supply pipe.

FIG. 4 is a cross-sectional view of an application example of a cooling device for an oil return supply pipe.

FIG. 5 is a system diagram showing an example in which an oil separator is used in a refrigeration cycle.

[Explanation of symbols]

1 ... Main body, 4 ... Demister, 5 ... Separated oil, 6 ... Oil drainage port, 6 '... Supply pipe, 8 ... Cooling device, 9 ... Compressor body,
14 ... Pressure sensor, 15 ... Temperature sensor.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroshi Yasuda 502 Jinritsucho, Tsuchiura-shi, Ibaraki Prefecture Hiritsu Manufacturing Co., Ltd.Mechanical Research Institute (72) Inventor Susumu Nakayama 502 Jinre-cho, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd. Inside the Mechanical Research Laboratory (72) Inventor, Kazuki Urata, 502 Kintatemachi, Tsuchiura City, Ibaraki Prefecture

Claims (1)

[Claims] 1. An oil separator for separating mist-like oil contained in a high-pressure refrigerant gas discharged from a compressor of a refrigerating machine in a closed container, wherein a top part is a separation mechanism and a bottom part is an oil sump structure. An oil separator of a refrigerating apparatus, characterized in that a supply pipe for supplying oil from an oil sump to a compressor is provided with a cooling mechanism.