JPH08200893A - Freezer - Google Patents

Abstract

PURPOSE: To stably operate a freezer over a long period of time by preventing a desiccant from being finely powdered by reducing vibration transmitted to a dryer during operation of the freezer. CONSTITUTION: A freezer forms a freezing cycle by successively connecting a compressor 1, a condenser 2, a pressure reducer 4, and an evaporator 5. In the freezer, there are provided a dryer 3 containing a desiccant therein between the condenser 2 and the pressure reducer 4, and a vibration absorption unit 8 at an inlet side of the dryer 3 for reducing vibration applied to the dryer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus which suppresses pulverization of a desiccant in a dryer and can be stably operated for a long period of time.

[0002]

2. Description of the Related Art Conventional refrigerants include dichlorodifluoromethane (hereinafter referred to as R-12) and R-2 which is an azeotropic mixed refrigerant.
R502 consisting of 2 and monochloropentfluorofluoroethane
Was used. And refrigerating machine oil contains C such as R-12.
Mineral oil and alkylbenzene oil, which have good compatibility with FC refrigerants, are used, and this refrigeration cycle has reached high quality levels such as reliability and durability.

However, due to the high ozone depletion potential, each of the above refrigerants destroys the ozone layer when it reaches the ozone layer above the earth by being released into the atmosphere. The destruction of the ozone layer is caused by the chlorine group in the refrigerant. Therefore, a refrigerant having a low chlorine group content, a refrigerant not containing a chlorine group, or a mixture thereof is considered as the alternative refrigerant.

As a refrigerant having a low chlorine content, for example, chlorodifluoromethane (HCFC-22, hereinafter R
-22) and a chlorine-free refrigerant is, for example, difluoromethane (HFC-32, hereinafter R-
32) and pentafluoroethane (HFC-12
5, hereinafter referred to as R-125). For the HFC-based refrigerant, a refrigerating machine oil such as an ester-based lubricating oil, an ether-based lubricating oil, or a mixed oil thereof which is compatible with the HFC-based refrigerant is used.

However, ester-based lubricating oils and ether-based lubricating oils have high reactivity with water and are easily hydrolyzed. Then, metal soap or the like generated by hydrolysis was accumulated in the pipe as sludge. In particular, they are likely to be deposited on the inlet side and / or the outlet side of a capillary tube used as a decompressor, which may increase the flow resistance or block the capillary tube.

As a refrigerating device using an HFC type refrigerant, there is, for example, Japanese Patent Application No. 6-230701 filed previously. This refrigeration system includes a compressor, a condenser, a dryer, a capillary tube that is a decompressor, an evaporator,
A refrigeration cycle is formed by sequentially connecting the accumulators with piping. In the dryer, granular molecular sieve which is a desiccant is stored in order to absorb water in the refrigerant and the refrigerator oil.

During operation of the refrigeration system, the compressor compresses the refrigerant and the condenser liquefies it. Then, after removing water in the refrigerant with a dryer, the pressure is reduced with a capillary tube and heat is exchanged with the cold air in the refrigerator by an evaporator. Then, the gas refrigerant and the liquid refrigerant are separated by the accumulator, and only the gas refrigerant is returned to the compressor.

[0008]

However, during the operation of the refrigerating apparatus, vibration is generated due to various causes such as driving of the compressor or the refrigerating fan. Since the conventional dryer is simply attached to the pipe and is provided in a dangling state without being fixed, the dryer vibrates considerably due to the vibration transmitted through the pipe. Therefore, the desiccant in the dryer was rubbed against each other and pulverized.

The fine particles of the molecular sieve granular desiccant flow into the capillary tube, which causes problems such as clogging of the capillary tube, damage and abrasion of sliding parts of the compressor, and increase of frictional resistance. . Further, the fine powder of the molecular sieve may act catalytically to promote the deterioration of the refrigerating machine oil such as the ester lubricating oil. Then, sludge is generated due to deterioration of the refrigerating machine oil, and this sludge is accumulated in the pipes to reduce the refrigerating capacity.

Therefore, an object of the present invention is to suppress the pulverization of the desiccant in the dryer and to operate the refrigeration system stably for a long period of time.

[0011]

In order to solve the above-mentioned problems, the invention of claim 1 is to provide a compressor, a condenser, a pressure reducer,
In a refrigerating apparatus that forms a refrigeration cycle by sequentially connecting an evaporator, the refrigerating apparatus is disposed between the condenser and the decompressor,
Further, the refrigerating apparatus is provided with a dryer for accommodating a desiccant therein and a vibration absorbing section for reducing vibration of the dryer on the inlet side of the dryer.

The invention according to claim 2 is the refrigerating apparatus according to claim 1, wherein the vibration absorbing portion is formed in a bellows shape.

The invention according to claim 3 is the refrigerating apparatus according to claim 1, wherein the vibration absorbing portion is formed in a spiral shape in which a pipe thinner than a pipe connected to the condenser is formed.

[0014]

In the refrigerating apparatus of the first aspect, the vibration absorbing section reduces the vibration of the dryer generated during the operation of the refrigerating apparatus. Therefore, the vibration transmitted to the dryer is reduced, and the desiccant contained is prevented from being pulverized.

Further, in the refrigerating apparatus of the second aspect, the vibration absorbing portion has a bellows shape. The bellows portion is deformed according to the vibration transmitted from the condenser side, and the vibration transmitted to the dryer is reduced.

Further, in the refrigerating apparatus of the third aspect, the vibration absorbing portion is formed by spirally forming a thin tube. The spiral portion is deformed according to the vibration transmitted from the condenser side, and the vibration transmitted to the dryer is reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a refrigeration circuit. In this refrigeration circuit, HFC type refrigerant is used as the refrigerant, and H is used as the refrigerating machine oil.
An ester-based lubricating oil that is compatible with the FC-based refrigerant is used. Then, in this refrigeration circuit, the refrigerant circulates in the direction of the arrow in FIG.

Reference numeral 1 denotes a compressor, which internally houses a compression element and an electric element which are not shown. Then, the refrigerant sucked from the suction port 1a is compressed by the compression element and discharged from the discharge port 1b. Reference numeral 2 denotes a condenser, which sends outside air by a cooling fan 2a to condense the passing refrigerant into a liquid refrigerant. Reference numeral 3 denotes a drier (the structure of which will be described later) containing a desiccant, which removes water contained in the refrigerant and the ester-based refrigerating machine oil. Four
Is a capillary tube which is a pressure reducer, and reduces the pressure of the refrigerant to facilitate evaporation. Reference numeral 5 denotes an evaporator, which is arranged in the cold air passage of the storage in which the refrigerating device is arranged. Then, the cooling air is circulated by the cooling fan 5a, and the cooling air and the refrigerant are heat-exchanged to perform a cooling action. An accumulator 6 stores the liquid refrigerant that cannot be completely evaporated in the evaporator and returns only the gas refrigerant to the compressor. A copper pipe 7 connects the devices 1, 2, 3, 4, 5, 6 to allow the refrigerant to circulate.

Reference numeral 8 is a vibration absorbing portion, and FIG. 2 is a side sectional view of the vibration absorbing portion 8 and the dryer 3. The main body of the dryer 3 has a cylindrical shape at the center, and is gradually smaller toward the inlet 9 and the outlet 10 at both ends. A pipe 7 connected to the capillary tube 4 is attached to the outlet 10. Reference numeral 11 denotes a filter having a plurality of holes 11a (hereinafter, referred to as a mesh filter), which is fixed inside the dryer 3 with two spaces in parallel.

Reference numeral 12 is a molecular sieve which is a desiccant, and is a particle larger than the pores of the mesh filter 11. The molecular sieve 12 has two mesh filters 1
It is housed between 1. The desiccant is preferably one that adsorbs water but does not adsorb HFC-based refrigerant. In the case of the molecular sieve 12, it is possible to change the size of the holes that perform the adsorption action. Therefore, it absorbs water and HFC
A desiccant that does not adsorb the system refrigerant can be used.

The vibration absorber 8 has a bellows shape, and one end thereof is welded to the inlet 9 of the dryer 3 and the other end thereof is connected to the pipe 7 connected to the condenser 2. The vibration absorbing portion 8 is made of copper and has a thickness smaller than that of the pipe.
Further, it can be expanded and contracted in the same direction as the traveling direction of the refrigerant (the arrow direction in FIG. 2), and can be deformed in the direction perpendicular to the traveling direction of the refrigerant. Therefore, when the pipe 7 vibrates, the pipe side of the vibration absorbing portion 8 also vibrates, but the vibration absorbing portion 8 is deformed according to the vibration, and the transmission of the vibration of the vibration absorbing portion 8 to the dryer 3 is reduced.

During operation of the refrigeration cycle, the compressor 1
Vibration is generated by driving the cooling fan 2a or the like. This vibration is transmitted to the vibration absorber 8 via the pipe 7. Then, the vibration absorber 8 fluctuates according to the vibration of the pipe 7, and absorbs the vibration. Therefore, the vibration transmitted to the dryer 3 can be reduced, and the molecular sieve 12 can be prevented from being pulverized.

FIG. 3 shows another embodiment of the vibration absorbing portion 13. The configuration and operation other than the vibration absorber 13 are the same as those in the embodiment of FIG. The vibration absorbing portion 13 has a copper pipe 13a thinner than the pipe 7 in a spiral shape. One is connected to the inlet 9 of the dryer 3 and the other is welded to the pipe 7 connected to the condenser 2. The vibration absorbing portion 13 can be deformed in any direction by spirally forming the thin copper tube 13a. Therefore, even if vibration occurs during the operation of the refrigeration cycle, the vibration absorbing portion 13 deforms and absorbs the vibration in accordance with the vibration of the pipe 7, so that the vibration transmitted to the dryer 3 can be reduced.

In this embodiment, copper tubes are used for the vibration absorbing parts 8 and 13. However, as long as the refrigerant can pass through the vibration absorbing parts 8 and 13 and can be joined to the dryer and the pipe, stainless steel, aluminum, synthetic resin or the like may be used. Further, the vibration absorbing portions 8 and 13 are not limited to the present embodiment as long as they have a shape capable of absorbing vibration.

[0026]

According to the present invention, a vibration absorbing portion capable of absorbing vibration is provided on the inlet side of the dryer. Therefore, the vibration transmitted to the dryer can be reduced, and the desiccant in the dryer can be prevented from being rubbed into fine powder. Therefore, it is possible to reduce the inconvenience caused by the fine powder of the desiccant, and it is possible to stably operate the refrigeration system for a long period of time.

Further, since the pulsation transmitted to the dryer can be reduced, the noise caused by the pulsation can be reduced.

[Brief description of drawings]

FIG. 1 is a refrigeration circuit diagram.

FIG. 2 is a side sectional view of a dryer and a vibration absorbing portion.

FIG. 3 is an explanatory view of another embodiment of the vibration absorbing portion.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Dryer 7 Piping 8 Vibration Absorber 9 Inlet 12 Molecular Sieve 13 Vibration Absorber

Claims (3)

[Claims] 1. A refrigeration apparatus in which a compressor, a condenser, a decompressor, and an evaporator are sequentially connected to form a refrigeration cycle, the refrigeration apparatus is provided between the condenser and the decompressor, and is provided inside thereof. A refrigerating apparatus comprising: a dryer that stores a desiccant; and a vibration absorber that reduces vibration applied to the dryer at the entrance side of the dryer. 2. The refrigerating apparatus according to claim 1, wherein the vibration absorbing portion is formed in a bellows shape. 3. The refrigerating apparatus according to claim 1, wherein the vibration absorbing portion is formed by spirally forming a pipe thinner than a pipe connected to the condenser.