JPH04316973A - Extracting device for non-condensable gas - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-condensable gas extraction system for positive displacement refrigerators and centrifugal refrigerators using compressors.

0002

2. Description of the Related Art Non-condensable gas leaking into a refrigeration cycle accumulates in a condenser as the refrigerator operates. When non-condensable gas accumulates, the compression ratio increases and power increases.

Conventional non-condensable gas bleed equipment connects a bleed gas recovery device to a condenser via bleed piping, cools the gas accumulated in the bleed gas recovery device and separates it into refrigerant and non-condensable gas, Noncondensable gas was released into the atmosphere based on the pressure difference between the pressure of

[0004] In other conventional air bleed devices, oil is stored in a bleed air recovery device, and when this oil is returned to an oil tank, the pressure in the bleed air recovery device decreases, creating a difference between the pressure in the condenser and the oil in the bleed air recovery device. The refrigerant gas (including non-condensable gas) in the condenser takes advantage of the pressure generated.
The refrigerant gas was introduced into the bleed gas collector, the refrigerant gas was dissolved in the oil, and the non-condensable gas was pressurized with the oil and released into the atmosphere.

On the other hand, in recent years, it has been found that certain fluorocarbons destroy the ozone layer, and it has become necessary to suppress the amount of fluorocarbons released into the atmosphere.

[0006] Therefore, there is a need for an air bleed device that can reduce the amount of refrigerant discharged more than conventional air bleed devices.

[0007] A related example of this type is JP-A-50-23056.

[0008]

[Problems to be Solved by the Invention] An object of the invention is to provide an air extraction device that improves air extraction capacity by reducing the amount of refrigerant gas released into the atmosphere together with the non-condensable gas in the condenser. be.

[0009]

[Means for Solving the Problems] The present invention introduces non-condensable gas and refrigerant in a condenser to a bleed gas recovery device, and cools the bleed gas recovery device to once reduce the refrigerant gas and non-condensable gas to a certain extent. The uncondensable gas containing some of the refrigerant gas is then led to a second container filled with oil to absorb the refrigerant gas. In addition, the second container filled with oil to increase the solubility of the refrigerant in the oil is provided as a partition wall on the outer periphery of the partition wall provided on the outer periphery of the bleed air recovery device for cooling the bleed air recovery device. It is formed.

[0010] In addition, in order to operate the air extraction device even when the refrigerator is stopped, oil is removed from the second container filled with oil, and as a means of lowering the pressure inside the container below the pressure inside the refrigerator, an oil return pipe is installed in the middle of the oil return piping. is equipped with a venturi.

[0011]

[Operation] The purity of the non-condensable gas (containing some refrigerant) led from the bleed air collector to the oil-filled partition wall is improved by dissolving the refrigerant gas into the oil. moreover,
The latent heat of cooling of the bleed air collector is used to cool the oil through the partition wall, thereby improving the solubility of the refrigerant in the oil.

[0012] In addition to the refrigerant, cooling water may be used to cool the bleed air recovery device.

[0013] Also, pressure oil from the oil pump of the compressor is used to generate negative pressure with a venturi.

[0014]

EXAMPLES The present invention will be explained below with reference to FIGS. 1 and 2.

One embodiment is shown in FIG.

The compressor 1 is equipped with an oil tank 2, a condenser 3, and an air extraction device 4 attached thereto.

The air bleed device includes a pipe 5 for guiding non-condensable gas including refrigerant gas from the condenser 3, a first partition wall 7 provided for cooling the outer periphery of the bleed air recovery device 6, and a second partition wall 7 provided on the outer periphery of the pipe 5. The second partition wall 8 is connected from the bleed air recovery device 6 to the second partition wall 8 through a pipe 9, and a solenoid valve 10 is provided in the middle of the pipe. Also, the second partition wall 8
A part of the oil supply pipe from the oil pump 11 of the compressor 1 is branched off to supply oil to the second partition wall 8, while an oil pipe for returning oil from the second partition wall 8 to the oil tank 2 is A return pipe 12 is provided, and a solenoid valve 13 is provided in the middle.

Furthermore, the second partition wall 8 is provided with oil level detectors 14, 15, a pipe 16 for discharging non-condensable gas to the atmosphere, and a solenoid valve 17.

The refrigerant condensed in the bleed gas collector is discharged to the evaporator 19 by means of a float switch 18 or the like. Further, a differential pressure detector 20 is provided between the bleed gas recovery device 6 and the condenser 3 in order to detect that the refrigerant and non-condensable gas have been separated to a certain extent in the bleed gas recovery device 6.

[0020] The non-condensable gas containing the refrigerant led to the bleed gas collector 6 via the pipe 5 is cooled by the refrigerant liquid or cooling water led into the first partition wall 7. Therefore, the refrigerant gas in the non-condensable gas is condensed, and the pressure in the bleed gas recovery device 6 is reduced compared to the condenser pressure. On the other hand, when a certain amount of non-condensable gas accumulates in the bleed gas recovery device 6, the differential pressure decreases. When the differential pressure reaches a specified value, the differential pressure detector 20 operates, the solenoid valve 10 opens, and non-condensable gas containing a small amount of refrigerant is guided to the second partition wall 8 via the pipe 9.

The closing operation of the electromagnetic valve 10 is performed when the differential pressure detector 20 is reset or after the time set by the timer has elapsed. Next, the solenoid valve 21 is activated at the same time as the solenoid valve 10 is closed, and oil is supplied to the second partition wall 8 via the pipe 22. By cooling the oil through the first partition wall 7, the refrigerant solubility of the oil can be increased and the refrigerant can be efficiently dissolved. As refrigerant dissolution progresses, the oil level decreases, and high-purity non-condensable gas accumulates at the top. When the oil level drops and the oil level detector 14 is activated, the solenoid valve 17 opens and releases non-condensable gas to the atmosphere. After the discharge, the solenoid valve 17 closes due to the operation of the oil level detector 15. Simultaneously with the closing operation of the solenoid valve 17, the solenoid valve 13 operates to return oil to the oil tank.

The pressure in the bleed air collector 6 is balanced by the pressure in the oil tank 2. Since the oil tank pressure during operation is lower than the condenser pressure, wait for the solenoid valve 10 to open, and then
The bleed cycle described above operates.

Next, a second embodiment is shown in FIG.

A venturi 23 is provided in the middle of the oil return pipe 12 leading from the second partition wall 8 to the oil tank 2, and the oil pump 1
Connect a part of the oil supply pipe 1 to part a of the venturi 23,
On the other hand, the oil return pipe 12 is connected to the b section of the venturi 23.

Next, the operation will be explained based on FIGS. 1 and 2.

By operating the oil pump 11 while the refrigerator is stopped, the pressure inside the second partition wall 8 becomes lower than the pressure inside the refrigerator due to the action of the venturi 23. Next, the solenoid valve 10 is opened, the bleed air collector 6 is cooled with cooling water through the first partition wall 7, and the non-condensable gas from which the refrigerant gas has been separated to some extent is transferred to the second partition wall 8.
Then, by opening the solenoid valve 21, the oil is sent to the second partition wall 8. By dissolving the refrigerant gas in the oil in this way, it is possible to separate it into highly pure non-condensable gas.

[0027]

[Effects of the Invention] According to the present invention, on the outer periphery of the bleed air recovery device,
The partition wall for cooling and further for oil sealing is integrally constructed, which allows for simplifying the component structure and reducing costs.

Furthermore, even when the refrigerator is stopped, by supplying cooling water from outside, the refrigerant can be condensed in the extraction device, and the purity of the non-condensable gas can be increased. Therefore, the non-condensable gas can be released immediately after starting the refrigerator.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an air extraction device according to an embodiment of the present invention.

FIG. 2 is a system diagram of an air extraction device according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1... Compressor, 2... Oil tank, 3... Condenser, 4... Air extraction device, 5... Piping, 6... Air extraction recovery device, 7... First partition, 8... Second partition, 9... Piping, 10, 13, 17, 21... Solenoid valve, 11... Oil pump, 12... Piping, 14, 15... Oil level detector, 16... Piping, 18... Flow valve, 19... Evaporator,
20... Differential pressure detector, 22... Piping, 23... Venturi.

Claims (1)

[Claims] 1. In a bleed air recovery device for a condenser, a container for taking in non-condensable gas from the condenser is provided with a first partition wall for introducing a refrigerant liquid for cooling the container with a refrigerant, A second partition wall for sealing oil is provided on the outer periphery of the partition wall, a pipe leading from the container to the second partition wall, and an on-off valve are provided in the middle of the pipe, and the second partition wall is provided with a pipe for sealing oil. A surface detector and a non-condensable gas release pipe are installed, and the non-condensable gas release pipe is provided with a valve that opens when the oil level in the second partition wall is below a certain value, while the second partition wall is provided with a valve that opens when the oil level in the second partition wall is below a certain value. A non-condensable gas bleed device characterized in that an oil pipe branched from an oil supply pipe of a compressor is connected, and the second partition wall and the compressor oil tank are connected by an oil return pipe.