JPH094946A - Refrigerator - Google Patents

Abstract

PURPOSE: To provide a refrigerator capable of simply grasping a sludge generating state in a refrigerant circuit. CONSTITUTION: The refrigerator comprises a refrigerant circuit for compressing gaseous refrigerant by a compressor 1, liquefying the compressed refrigerant, introducing the liquefied refrigerant to an evaporator 14 via an expansion valve or a capillary tube 13, vaporizing and again returning it to the compressor. A sight glass capable of visually observing the interior of the tube is provided on the way of the tube 11 of the circuit, and a net is provided in the tube provided with the glass.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention compresses a refrigerant in a gaseous state with a compressor, and liquefies the compressed refrigerant with a condenser,
The present invention relates to a refrigerating apparatus including a refrigerant circuit that guides the liquefied refrigerant to an evaporator through an expansion valve or a capillary tube, vaporizes the refrigerant, and returns it to the compressor again.

[0002]

2. Description of the Related Art A refrigerating apparatus of this type is disclosed, for example, in Japanese Patent Laid-Open No.
No. 307742 (F25B49 / 02). A sight glass is provided in the middle of the piping of the refrigerant circuit of this refrigeration apparatus, and the flow of the refrigerant in the piping can be visually observed through the sight glass.

Conventionally, Freon 12 containing chlorine atoms has been used as the refrigerant, and mineral oil or alkylbenzene oil has been used as the lubricating oil.

[0004]

However, Freon 12 destroys the ozone layer. Therefore, in order to prevent the destruction of the ozone layer, use of HFC-based CFCs, which are CFCs containing no chlorine atom in the molecule, has been considered.

However, this HFC-based CFC is not compatible with mineral oils, alkylbenzene-based oils and the like. Therefore, ester-based lubricating oil, ether-based lubricating oil, or a mixed oil thereof is used as a lubricating oil for HFC-based CFCs. However, the lubrication performance using the HFC-based CFC deteriorates as compared with the case using the CFC 12. As a result, sliding parts inside the compressor are worn and sludge is generated more frequently than in the case of the flon 12.
Then, the sludge flows in the refrigerant circuit together with the refrigerant and adheres to the compressor, the evaporator, the expansion valve, the capillary tube, etc., and the cooling efficiency deteriorates. Further, when the sliding parts of the compressor are worn, the compression efficiency of the compressor is reduced. Therefore, when the amount of sludge generated exceeds a predetermined amount, it is necessary to replace the compressor or clean the inside of the refrigerant circuit, but it was not possible to easily grasp the state of sludge generation.

An object of the present invention is to solve the above problems, and an object thereof is to provide a refrigerating apparatus capable of easily grasping the generation state of sludge in the refrigerant circuit.

[0007]

In the refrigerating apparatus of the present invention, a compressor (1) compresses a refrigerant in a gas state, the compressed refrigerant is liquefied in a condenser (12), and the liquefied refrigerant is liquefied. Is provided to the evaporator (14) through the expansion valve or the capillary tube (13), vaporized, and returned to the compressor again. Further, in order to achieve the above-mentioned object, a sight glass (21) for visually observing the inside of the pipe is provided in the middle of the pipe (11) of the refrigerant circuit, and the sight glass (21) is provided inside the pipe. Is provided with a net (24).

Further, irregularities (27, 28) may be formed on the surface of the sight glass on the inner side of the pipe.

[0009]

[Operation] Refrigerant circulates in the refrigerant circuit of the refrigeration system.
When sludge is mixed in the refrigerant, it adheres to the net. If you look through the sight glass, you can observe the sludge that has adhered to this net.

If irregularities are formed on the surface of the sight glass on the inner side of the pipe, sludge adheres to the irregularities. This sludge can also be observed by looking through the sight glass.

[0011]

EXAMPLE A first example of the refrigerating apparatus of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is an explanatory diagram of a refrigerant circuit of a refrigerating apparatus according to the present invention. FIG. 2 is a perspective view of a pipe portion provided with a sight glass.
FIG. 3 is a plan view of FIG. FIG. 4 illustrates a state in which the inside of the pipe is viewed through the sight glass. (A) is a diagram before the sludge is attached, and (b) is a diagram after the sludge is attached.

In FIG. 1, a rotary compressor 1 as a compressor is provided with a motor section 3 for rotationally driving a rotor 2, a cylinder 4 is provided around the tip of the rotor 2, and a pump section is provided. 5 are configured. When electricity is supplied to the motor unit 3, the rotor 2
Rotates, and the pump unit 5 operates. Then, the rotary compressor 1 sucks the refrigerant through the suction pipe 7 and discharges it through the discharge pipe 8. The discharged refrigerant is guided to the condenser 12 via the pipe 11 and liquefied. The liquefied refrigerant is passed through the pipe 11 and the capillary tube 13 and the evaporator 1
4 leads to vaporize. Then, it returns to the rotary compressor 1 again via the pressure accumulator 16 which is a gas-liquid separator and the pipe 11. In this way, a refrigerant circuit that comes out of the rotary compressor 1 and returns again is formed, that is, a so-called refrigeration cycle.

In the middle of the pipe 11 of the refrigerant circuit, sight glasses 21 made of a transparent plate are provided at a plurality of places.

2 and 3, the sight glass 21 is formed of, for example, a transparent glass plate or a transparent synthetic resin plate, and the opening surface of a cylindrical casing 23 arranged in the middle of the pipe 11. Is attached to.
The refrigerant flows inside the casing 23 and constitutes a part of the pipe 11. Then, inside the casing 23, a plurality of metal nets 24 are attached so as to cross the flow of the refrigerant. The wire mesh 24 is optimally about 100 to 200 mesh / inch (mesh / 25.4 mm), and is arranged in a state of being inclined at an angle of about 45 degrees with respect to the surface of the sight glass 21.

With this structure, when the refrigerant flows through the pipe 11, the refrigerant passes through the mesh of the wire mesh 24. If this refrigerant contains sludge, it adheres to the wire mesh 24. When the refrigeration system was first installed, the sight glass 2
When the inside of the casing 23 is viewed from 1, the wire netting 24 can be seen as shown in FIG. However, after the refrigeration system has been operated for a long period of time, sludge is mixed into the refrigerant, and when the inside of the casing 23 is seen from the sight glass 21, it can be seen from FIG.
As shown in (b), wire mesh 24 with sludge 25 attached
Can be seen. When a large amount of sludge 25 adheres,
Clean the refrigerant circuit or replace the refrigeration system. Note that the water content in the refrigerant can also be observed through the sight glass 21. Further, since the metal net 24 crosses the flow of the refrigerant, it is possible to reliably capture the sludge.

It is not always necessary to provide a plurality of sight glasses 21 in the middle of the pipe 11, and it is possible to provide only one sight glass. In that case, since the sludge 25 is more likely to adhere to the wire net 24 when the flow of the refrigerant is slower, it is necessary to provide the pipe 11 between the evaporator 14 and the suction pipe 7 of the rotary compressor 1 where the flow of the refrigerant becomes slow. Is preferred.

Next, a second embodiment of the refrigerating apparatus according to the present invention will be described with reference to FIG. 5A and 5B are explanatory views of the sight glass of the second embodiment. FIG. 5A is a rear view and FIG. 5B is a rear view of a modified example. In the second embodiment, unlike the first embodiment, the wire netting 24 is not arranged. And
In the first embodiment, the sight glass 21 has a flat plate shape with both sides formed flat. On the other hand, the sight glass 21A of the second embodiment has a flat outer surface, but the inner surface shown in FIG.
As shown in (a), a large number of thin V grooves 27 are formed in a grid pattern. Further, as shown in FIG. 5B, a sight glass 21B as a modified example of the second embodiment has a plurality of protrusions 28 formed on the inner surface thereof. In this way, V groove 2
7 and the protrusions 28 form irregularities on the surface of the sight glass on the inner side of the pipe 11, that is, the inner surface, and are notched, and sludge adheres to these irregularities. As described above, since the unevenness for sludge adhesion is formed on the sight glass, it is not necessary to separately provide a net, and the number of parts and the number of mounting steps can be reduced.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the gist of the present invention described in the claims. It is possible to make changes. A modified embodiment of the present invention is illustrated below. (1) In the embodiment, the refrigerant is HFC type Freon, but Freon 12 or Freon 22 may be used.

(2) In the embodiment, as long as the sight glass is transparent, the material thereof can be appropriately selected such as glass and synthetic resin. (3) Although the capillary tube 13 is provided in the embodiment, an expansion valve may be provided instead of the capillary tube 13. (4) In the embodiment, the sight glass is provided in the cylindrical casing 23 of the pipe 11, but it is also possible to provide the sight glass directly on the pipe portion of the pipe 11 without providing the casing 23.

(5) In the embodiment, the net is a wire net, but the material thereof can be appropriately selected. For example, it may be made of a synthetic resin material or the like. Further, the arrangement direction of the net can be appropriately selected. If the mesh surface is perpendicular to the flow of the refrigerant circuit, sludge tends to adhere, and
When the surface of the net is made substantially parallel to the surface of the sight glass, it becomes easy to visually check the surface of the net. By the way, since the flow of the refrigerant is generally parallel to the surface of the sight glass, if the surface of the net is arranged obliquely with respect to the surface of the sight glass, sludge is also likely to adhere, and it is also possible to visually check It will be easy.

(6) In the embodiment, the unevenness is the V groove 27.
Although it is formed by the protrusions 28 or 28, its shape can be appropriately changed as long as the sludge can adhere thereto.

[0022]

According to the present invention, a sight glass for visually observing the inside of the piping is provided in the middle of the piping of the refrigerant circuit, and a net is provided inside the piping provided with this sight glass. Has been. Therefore, when sludge is mixed with the refrigerant in the refrigerant circuit, the sludge is captured by the net. As a result, sludge can be monitored by looking through the sight glass.

Similarly, even when irregularities are formed on the surface of the sight glass on the inner side of the pipe, the sludge is captured by the irregularities. As a result, sludge can be monitored by looking through the sight glass.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a refrigerant circuit of a refrigeration system according to the present invention.

FIG. 2 is a perspective view of a pipe portion provided with a sight glass.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 shows a state in which the inside of the pipe is seen through a sight glass, (a) is a diagram before sludge adhesion,
(B) is a figure after sludge adhesion.

FIG. 5 is an explanatory view of the sight glass of the second embodiment,
(A) is a rear view, (b) is a rear view of a modification.

[Explanation of symbols]

 1 Rotary compressor (compressor) 12 Condenser 13 Capillary tube 14 Evaporator 11 Piping 21 Sight glass 24 Wire mesh 27 V groove (uneven) 28 Protrusion (uneven)

Claims (2)

[Claims] 1. A compressor compresses a gaseous refrigerant, liquefies the compressed refrigerant in a condenser, and guides the liquefied refrigerant to an evaporator through an expansion valve or a capillary tube and vaporizes the refrigerant. In a refrigeration system equipped with a refrigerant circuit for returning to the compressor again, a sight glass that allows the inside of the pipe to be seen is provided in the middle of the piping of the refrigerant circuit, and a net is provided inside the pipe where the sight glass is provided. A refrigerating device, which is provided. 2. A compressor compresses a gaseous refrigerant, liquefyes the compressed refrigerant in a condenser, and guides the liquefied refrigerant to an evaporator through an expansion valve or a capillary tube and vaporizes the refrigerant. In a refrigeration system equipped with a refrigerant circuit that returns to the compressor, a sight glass that allows the inside of the pipe to be seen is provided in the middle of the piping of this refrigerant circuit. Refrigerating device characterized in that