JPH04353359A - Freezer device - Google Patents

Abstract

PURPOSE:To provide a compact freezer device and attain a stable circulation of lubricant oil to a compressor. CONSTITUTION:A freezer device is composed of a lubricant oil storing device 4 for constituting a lubricant oil purifying system in the freezer, a lubricant oil cooling device 5 and a lubricant oil filter 6. Either all or any two of these devices are stored in a container 2 and a barrel part of the container 2 is provided with a refrigerant gas discharging port. Accordingly, it is possible to get a compact freezer device, provide a stable circulation of lubricant oil to a compressor and a reduction in an increased amount of lubricant oil.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil circulation system for lubricating compressors of refrigerators and air conditioners.

0002

[Prior Art] The conventional device is a magazine: "Frozen" in 1988.
Year VOL. 63, No. As shown in Figure 10 on page 50 of 731, a lubrication cycle is formed by connecting the compressor, lubricating oil separator, lubricating oil tank, lubricating oil cooler, and lubricating oil filter to the compressor again with piping. Common.

0003

[Problems to be Solved by the Invention] FIG. 4 shows the above-mentioned conventional refrigeration cycle.

The lubrication system of this refrigeration cycle separates the refrigerant mixed with lubricating oil discharged from the compressor 1 in a lubricating oil separator 3, and immediately drops the separated lubricating oil into a lubricating oil tank 4. This is a system in which lubricating oil is cooled in a cooler 5 and filtered in a lubricating oil filter 6, and then lubricating oil is supplied to the bearing portion of the compressor 1 using a differential pressure between high and low pressures.

FIG. 5 shows an equipment configuration diagram of the refrigerator of the refrigeration cycle shown in FIG. 4. Since each of these devices is independent and connected to each other by piping, their volume occupies a large proportion of the entire device, squeezing the available space. Furthermore, since there are many connection points, there are problems such as decreased reliability due to refrigerant leaks and increased manufacturing costs.

[0006] In addition, in this system, the refrigerant discharge amount of the compressor 1,
The pressure inside the lubricating oil separator 3 and the differential pressure between the lubricating oil separator 3 and the lubricating oil tank 4 are related to the behavior of the lubricating oil flow. In operating conditions where the lubricating oil is reduced, the lubricating oil does not flow from the lubricating oil separator 3 to the lubricating oil tank 4, and the lubricating oil accumulates in the lubricating oil separator 3 and is transferred to the downstream side of the refrigerant cycle together with the refrigerant gas. Gas is discharged to the evaporator 9 and accumulates in the evaporator 9, leading to a decrease in heat exchange efficiency. Also, a gas pocket is generated in the lubricating oil tank 4, and the bearing of the compressor 1 is damaged due to the insufficient amount of lubricating oil held in the lubricating oil tank. No consideration was given to the lack of oil supply to the parts.

An object of the present invention is to make the refrigeration system more compact and to stabilize the circulation of lubricating oil to the compressor.

[0008]

[Means for Solving the Problems] The above object is to provide a compressor for discharging a refrigerant containing lubricating oil, a lubricating oil separator for separating the lubricating oil from the refrigerant discharged by the compressor, and a lubricating oil separator for separating the lubricating oil from the refrigerant discharged by the compressor. a lubricating oil reservoir for storing separated lubricating oil; a lubricating oil cooler for cooling the lubricating oil that becomes high in temperature due to the heat of compression of the refrigerant in the compressor and flows from the lubricating oil reservoir; and the lubricating oil cooler. A lubricating oil circulation system comprising a lubricating oil filter for filtering foreign matter in the lubricating oil cooled by the lubricating oil, and a lubricating oil piping that leads the lubricating oil filtered by the lubricating oil filter to the lubricating system of the compressor. This is achieved by housing at least any two of the lubricating oil reservoir, the lubricating oil cooler, and the lubricating oil filter in one container.

The above object is achieved by disposing the lubricating oil cooler on the lubricating oil inlet side of the container and the lubricating oil filter on the lubricating oil outlet side of the container.

[0010] The above object is achieved by the container being a horizontal shell-and-tube heat exchanger.

The above object is achieved by providing a capillary tube that communicates the body of the container with the low pressure or intermediate suction stage side of the compressor.

[0012] The above object is achieved by providing a pipe interposed with a solenoid valve that is opened when the compressor is in operation, between the body of the container and the low pressure or intermediate suction stage side of the compressor. be done.

[0013]

[Operation] According to the above structure, all or any two of the lubricating oil reservoir, lubricating oil cooler, and lubricating oil filter that constitute the lubricating oil circulation system are housed in one container. Its volume is smaller and more compact, increasing the available space. Furthermore, since there are extremely few connection points, it is possible to prevent a decrease in reliability due to refrigerant leaks, and the manufacturing cost is also reduced.

[0014] By making the container a horizontal shell-and-tube type heat exchanger, a lubricating oil reservoir can be formed by simply extending the tube bundle U-shaped side of the shell, and a lubricating oil filtering part is attached to the lubricating oil outlet. This makes it easy to attach and detach, making maintenance convenient.

The capillary tube that communicates between the body of the container and the low pressure or intermediate suction stage side of the compressor converts the refrigerant gas that flows into the lubricating oil from the lubricating oil separator and accumulates in the container into refrigerant gas. By extracting only the refrigerant gas due to the difference in specific gravity of the lubricating oil and discharging it to the low pressure or intermediate suction stage side of the compressor where the pressure is lower, the pressure inside the container decreases and the lubricating oil easily flows from the lubricating oil separator, and the compressor It is possible to stabilize the circulation of lubricating oil to.

[0016] The piping, which connects the body of the container and the low pressure or intermediate suction stage side of the compressor and is equipped with a solenoid valve that opens when the compressor is operating, has a low possibility of clogging with foreign matter and ensures that the container is not clogged. Discharge the accumulated refrigerant gas.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram showing the configuration of this embodiment. The solid arrows in this figure indicate the flow direction of the refrigerant and lubricating oil. The refrigerant is compressed by the compressor 1 to become a high-temperature, high-pressure gas and discharged together with lubricating oil, and is separated into refrigerant gas and lubricating oil in the lubricating oil separator 3. The refrigerant gas separated in the lubricating oil separator 3 becomes condensed liquid in the condenser 7, becomes a low-pressure liquid refrigerant in the expansion valve 8, and is further evaporated in the evaporator 9 to perform cooling action, and then is sent to the compressor 1. Inhaled.

FIG. 2 is a longitudinal sectional view showing the flow of lubricating oil within the container 2 of this embodiment. Although the container 2 shown in this figure is a horizontal shell-and-tube type heat exchanger, the present invention is not limited to this type, and a normal pressure vessel may be used. The lubricating oil separated by the lubricating oil separator 3 flows between the baffle plates 11 on the body side of the container 2 as shown by the broken arrow, and
The oil temperature is lowered to 40 to 60°C by cooling water or liquid refrigerant flowing through the cooling pipes of the shaped tube bundle. The area after passing through the final stage baffle plate is a lubricating oil storage area, and a lubricating oil filtering device 12 is provided in this area. The filtration element consists of filter paper or metal filter body,
Collects foreign substances in lubricating oil. For the equipment stored in the container 2, the lubricating oil filtration device 12 can be omitted if there are few foreign substances in the lubricating oil and there is no need for filtration, and the internal volume of the cooling part is the value necessary to store the lubricating oil. If so, there is no need to provide a lubricating oil reservoir and the lubricating oil reservoir can be selected as appropriate.

The container 2 has a high pressure section, and has a gas outlet provided at the upper part of the body side and a low pressure part in a refrigeration cycle or an intermediate pressure part in a two-stage compression cycle, for example, a low pressure or intermediate suction part of the compressor 1. By connecting the stage side with the capillary tube 13, the refrigerant gas accumulated in the lubricating oil circulation system is discharged to the lower pressure side due to the pressure difference between the two. By this operation, the lubricating oil separated by the lubricating oil separator 3 easily flows into the container 2. The flow rate characteristics of the capillary tube 13 are determined by the diameter and length, the pressure difference between the inlet and outlet, and the specific weight of the passing fluid. The specific gravity of the lubricating oil is larger than that of the refrigerant gas, and although the refrigerant gas is allowed to pass through, the specifications are determined so that the flow rate is approximately zero when the lubricating oil passes through.

A similar operation can be achieved by using a pipe with an outer diameter of 6.35 to 9.35 mm and equipped with a solenoid valve instead of the capillary tube 13, and by opening this solenoid valve for a certain period of time while the compressor 1 is operating. can be made to do so.

Furthermore, the amount of refrigerant gas accumulated in the oil supply system and the lubricant oil accumulated in the lubricating oil separator 3 can be minimized, and the oil supply to the bearings of the compressor 1 can be stabilized. It is possible to reduce the amount of lubricating oil flowing to the low pressure side.

FIG. 3 is a diagram showing the equipment configuration of the refrigerator of this embodiment. As shown in this figure, if the compressor 1, lubricating oil separator 3, container 2, and condenser 7 are stacked vertically in a single row, it is possible to integrate the equipment that makes up the oil supply system in the refrigeration cycle, making the device more compact. It is possible to achieve greater efficiency and cost reduction. The installation area can be reduced by 50%, the product volume by 50%, and the number of main pipes by 75% compared to conventional products, and the pressure loss in the oil supply system can be significantly reduced.

[0024]

[Effects of the Invention] According to the present invention, all or any two of the lubricating oil reservoir, lubricating oil cooler, and lubricating oil filter that constitute the lubricating oil circulation system are housed in one container. This has the effect of increasing the usable space since the device becomes more compact. Furthermore, since there are extremely few connection points, it is possible to prevent a decrease in reliability due to refrigerant leaks, and the manufacturing cost is also reduced.

The capillary tube that communicates between the body of the container and the low pressure or intermediate suction stage side of the compressor discharges the refrigerant gas accumulated in the container, so the pressure inside the container decreases and the lubricating oil is removed from the lubricating oil separator. can easily flow into the compressor, thereby stabilizing the circulation of lubricating oil to the compressor.

[0026] A pipe equipped with a solenoid valve that communicates the body of the container with the low pressure or intermediate suction stage side of the compressor reliably discharges the refrigerant gas.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a container according to an embodiment of the present invention.

FIG. 3 is an equipment configuration diagram of a refrigerator according to an embodiment of the present invention.

FIG. 4 is a system diagram of a conventional refrigeration cycle.

FIG. 5 is an equipment configuration diagram of a conventional refrigerator.

[Explanation of symbols]

1 Compressor 2 Container 3 Lubricating oil separator 4 Lubricating oil tank 5 Lubricating oil cooler 6 Lubricating oil filter 7 Condenser 8 Expansion valve 9 Evaporator 10 Cooling pipe 11 Baffle plate 12 Lubricating oil filtration device 13 Capillary tube

Claims (5)

[Claims] Claim 1: A compressor for discharging a refrigerant containing lubricating oil, a lubricating oil separator for separating the lubricating oil from the refrigerant discharged by the compressor, and storing the lubricating oil separated by the lubricating oil separator. a lubricating oil reservoir, a lubricating oil cooler that cools the lubricating oil that becomes high in temperature due to the heat of compression of the refrigerant in the compressor and flows from the lubricating oil reservoir; In a refrigeration system equipped with a lubricating oil circulation system having a lubricating oil filter for filtering out foreign substances and a lubricating oil piping that guides the lubricating oil filtered by the lubricating oil filter to the lubricating system of the compressor, A refrigeration system characterized in that at least two of an oil reservoir, the lubricating oil cooler, and the lubricating oil filter are housed in one container. 2. The refrigeration system according to claim 1, wherein the lubricating oil cooler is disposed on the lubricating oil inlet side of the container, and the lubricating oil filter is disposed on the lubricating oil outlet side of the container. 3. The refrigeration apparatus according to claim 1, wherein the container is a horizontal shell-and-tube heat exchanger. 4. The compressor according to claim 1, further comprising a capillary tube that communicates between the body of the container and the low pressure or intermediate suction stage side of the compressor. Refrigeration equipment as described. 5. A pipe equipped with a solenoid valve that is opened when the compressor is in operation is provided between the body of the container and the low pressure or intermediate suction stage side of the compressor. A refrigeration system according to any one of claims 1 to 3.