JPH08247585A - Refrigerating cycle for refrigerator or the like - Google Patents

Abstract

PURPOSE: To achieve a higher reliability by preventing the clogging in a capillary tube with iron based foreign matters in a refrigerating machine oil in a refrigerating cycle of a refrigerator. CONSTITUTION: In a refrigerating cycle, a catcher 2 is set between a compressor 1 and a condenser 3. Foreign matters in the refrigerating cycle gets accumulated into the catcher 2 utilizing a specific weight difference and a magnetic force to keep them from spilling into the refrigerating cycle thereby eliminating the clogging of a capillary tube 5. Thus, in the refrigerating cycle of a refrigerator, inflow of iron based foreign matters into the capillary tube can be stemmed to prevent the clogging in the capillary tube thereby achieving a higher reliability of the refrigerating cycle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator equipped with a compressor using iron-based sliding parts, in which refrigerating machine oil is contaminated with iron-based foreign matters such as abrasion powder generated by friction of sliding parts. In order to prevent the capillary tube having a small diameter from being discharged from the compressor together with the refrigerant and obstructing the normal flow of the refrigerant, the above-mentioned abrasion powder and the like are captured in the middle of the pipe in front of the capillary tube. The present invention relates to a refrigerating cycle such as a refrigerator provided with a trap.

[0002]

2. Description of the Related Art It is well known that foreign substances discharged from a compressor together with a refrigerant and flowing out during a refrigeration cycle adversely affect the reliability of the refrigeration cycle. These foreign substances mainly include foreign substances mixed through process submaterials such as processing oil and cutting oil used during the assembly of the refrigeration cycle, abrasion powder of the sliding parts of the compressor, refrigerant, refrigeration oil and refrigeration cycle components. Products from chemical reactions are possible. In a conventional refrigerator, a dryer provided to remove water in the refrigeration cycle has a function of eventually capturing the foreign matter. For this reason, there is a problem that the granular desiccant in the dryer is broken by the foreign matter and becomes powdery, and the dryer itself is clogged.

Further, there is one shown in FIGS. 8 to 9 in which a device for capturing foreign matters other than the dryer is provided in the refrigeration cycle.

In the figure, 21 is a compressor, 22 is a condenser, 23 is a foreign matter removing pipe, 24 is a dryer, 25 is a capillary tube, 26 is an evaporator, and these item numbers 21 to 26 are sequentially connected in series with a pipe 27. It is connected in a ring. The details of the foreign matter removing pipe 23 will be described with reference to FIG. 9. The foreign matter removing pipe 23 is filled with a filter material 28 made of copper-based spherical metal. Reference numeral 29 is a net having a roughness corresponding to 8 to 12 mesh, and the filter 28
Is held in the pipe by this net 29. These nets 29
The filter 28 is provided for the purpose of capturing an inhibitory substance generated in the refrigeration cycle, for example, abrasion powder. However, since the mesh 29 has a very fine mesh of 8 to 12 mesh, the mesh 29 itself. Was often clogged with abrasion powder. This can be said also in the filter 28 part made of a copper-based spherical metal.

As a conventional example of this type, Japanese Patent Laid-Open No. 6-19
No. 4009 is available.

[0006]

The above-mentioned prior art has the following problems.

(1) When the filter or the adsorbent (dryer) deteriorates due to foreign matter, there is a possibility that the foreign matter may pass through the net and jump out to the pipe side (capillary tube side) to block the capillary tube.

(2) There is a risk that clogging of the filter hole due to foreign matter may occur in the foreign matter removing mechanism.

(3) The adsorbent for the dryer has problems such as the limitation of the adsorption capacity and the deterioration of the adsorbent in relation to foreign matters.

[0010]

As means for solving the above problems, according to the present invention, (1) the trap provided in the refrigeration cycle is provided as a pipe having a diameter larger than that of the inner wall of the pipe or a pipe that can be easily stored, The foreign matter is captured without disturbing the normal flow of the.

(2) The material of the trap is refrigerant, refrigerating machine oil,
There is no chemical change due to foreign substances mixed in during the refrigeration cycle,
In addition, the material does not deteriorate.

(3) A structure and a material that allow the function of the foreign matter removing mechanism to act semipermanently are adopted.

As a concrete means of the above, in a refrigeration cycle in which a compressor, a condenser, a dryer, a capillary tube, and an evaporator are sequentially connected in series by a pipe in an annular shape, between the discharge side of the compressor and the capillary tube. A trap having a diameter larger than the inner diameter of the front and rear pipes or one of the pipes is provided in the middle of the pipe, and the trap is used to trap a substance having a large specific gravity mixed in the refrigeration cycle.

Further, with respect to the trap provided between the discharge side of the compressor and the capillary tube, the discharge side is provided at the bottom of the trap and the other side is provided at a position apart from the bottom so that foreign substances are present on the capillary tube side. It is designed so that it will not clog the capillary tube due to flow.

Further, a permanent magnet for capturing iron-based foreign matter mixed in the refrigeration cycle is provided in the middle of the pipe between the compressor discharge side and the capillary tube or in the middle of the pipe in front of the dryer, and The permanent magnet mounting position is
The position is such that it does not enter the inside of the pipe inner wall, which does not hinder the normal flow of the refrigerant.

[0016]

The main cause of the clogging of the capillary tube is the abrasion powder of the sliding portion of the compressor and the substance produced by the reaction of the abrasion powder with the refrigerant and the refrigerating machine oil. At present, iron-based foreign matter is generally used as the material of the sliding parts of the compressor.
Effective in preventing clogging of capillary tubes.

In the present invention, a compressor, a condenser, a dryer,
In a refrigerator refrigeration cycle in which a capillary tube and an evaporator are sequentially connected in an annular shape by pipes, a permanent magnet is installed in the middle of the pipe between the compressor discharge side and the condenser or in the middle of the pipe between the condenser discharge side and the capillary tube. By arranging it, it captures the iron-based foreign matter mixed in the refrigerating machine oil discharged from the compressor together with the refrigerant and flowing out during the refrigeration cycle, and the iron-based foreign material flows into the capillary tube to clog the refrigeration cycle. Prevent.

When the trap is provided between the compressor and the condenser, the iron-based foreign matter or the chemical reaction product of the iron-based foreign matter and the refrigerating machine oil does not stay in the condenser, and It is possible to prevent the heat radiation performance of the device from deteriorating.

Further, the permanent magnet has a cylindrical shape and is installed on the inner wall of a cylindrical trap provided in the middle of the pipe and having an inner diameter larger than the inner diameter of the pipe to ensure a normal flow of the refrigerant. Further, by ensuring the inner diameter of the permanent magnet to be larger than the inner diameter of the pipe connected to both ends of the trap, even if a certain amount of iron-based foreign matter is adsorbed and accumulated on the magnet, the refrigerant flow path larger than the inner diameter of the pipe can be secured. Can be secured. Further, since the flow velocity of the refrigerant becomes slower by enlarging the inner diameter of the trap, it is possible to improve the effect of adsorbing the iron-based foreign matter.

Further, by disposing the permanent magnet in a substantially cylindrical shape in which the inner wall has a tapered cross-section, and the inner diameter thereof becomes smaller toward the downstream side with respect to the flow of the refrigerant, the inner wall of the permanent magnet is reduced. When the amount of iron-based foreign matter adsorbed decreases toward the downstream side, the inner diameter of the inner wall of the permanent magnet with the iron-based foreign matter attracted becomes uniform, and the foreign matter locally accumulates on the upstream inner wall where the flow velocity is slow. Can be prevented from becoming narrow.

Further, in a refrigeration cycle equipped with a silencing tank in the middle of the discharge side pipe of the compressor, by installing a substantially cylindrical permanent magnet on the inner wall of the silencing tank, only the permanent magnet is added to the existing refrigeration cycle. Only the changes need to be made, and the cost can be reduced.

In a refrigeration cycle using an iron-based condenser, the iron-based foreign matter is captured in the condenser by magnetizing the condenser. In this case, when foreign matter is adsorbed on the inner wall of the condenser, the resistance of the refrigerant flow may increase slightly compared to when it is not adsorbed, but it is necessary to add a permanent magnet to the existing refrigeration cycle. Therefore, the existing refrigeration cycle can be used as it is.

Further, in a refrigeration cycle using an HFC type refrigerant containing no chlorine in the refrigerant, CF containing chlorine is used.
Compared with the case where a C or HCFC refrigerant is used, the lubricity of the compressor sliding portion is reduced and the amount of abrasion powder is increased, so that the effect of the present invention is particularly effective.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described with reference to the embodiments shown in FIGS.

FIG. 1 is an explanatory view of a refrigeration cycle system such as a refrigerator equipped with the present invention, FIG. 2 is a detailed view of a portion A of FIG. 1, and FIG.
FIG. 4 is a detailed view of an A part of FIG.
2 is a diagram showing an embodiment different from those shown in FIGS. 2 and 3 in a view corresponding to details of part A in FIG. 1, FIG. 5 is a diagram showing an embodiment different from that in FIG. FIG. 7 is a system explanatory view of a refrigeration cycle using the iron-based drainage condenser of the invention, and FIG. 7 is an explanatory view showing an example in which the present invention is applied to a refrigeration cycle different from FIG.

First, in FIG. 1, 1 is a compressor, 2 is a trap, 3 is a condenser, 4 is a dryer, 5 is a capillary tube, 6 is an evaporator, and 7 is a pipe. Then, the above item No. 1
6 are connected in series with a pipe 7 in series and in a ring form a refrigerating cycle such as a refrigerator.

Next, the details of the trap 2 will be described with reference to FIG. In the figure, 2 is a trap, 7a and 7b are pipes, 7a reaches the compressor side, and 7b reaches the capillary tube side. The pipe 7a is the bottom 2a of the trap 2.
It is opened in the vicinity, and the open portion of the pipe 7b is located away from the trap 2a, that is, above the open portion of the pipe 7a. As a result, the refrigerant and foreign matter discharged from the pipe 7a hit the bottom 2a. At this time, the specific gravity of the refrigerant is 1.3 or less even when the specific gravity is liquid, while the foreign matter is 7.9 in the case of iron type, 2.7 in the case of aluminum type, and foreign in the case of copper type. Is very heavy at 9.0, these foreign substances are not sucked into the pipe 7b side and the trap 2a
It accumulates at the bottom. Reference numeral 8 is a permanent magnet, and it is preferable to select a material for the magnet 8 so as not to generate foreign matter by reacting with the refrigerant and the refrigerating machine oil in the refrigerating cycle. Of the iron-based foreign matter 9 accumulated on the bottom portion 2a of the previous trap 2, when a small one or when the refrigerant in the refrigeration cycle is disturbed,
Since it is conceivable that the foreign matter captured by the capture device 2 will suddenly fly out of the capture device 2, the above-mentioned permanent magnet 8 is provided as a means for securely capturing the foreign substance.

The catcher 2 may be provided near the compressor 1 as shown in FIG. 1 and used as a muffling tank.

FIG. 3 shows an embodiment different from that shown in FIG. What is shown in this figure is one in which the open portions of the pipe 7a and the pipe 7b overlap so that the foreign matter once discharged together with the refrigerant from the pipe 7a is not sucked into the pipe 7b and easily collects in the trap 2. is there. Of course, if the permanent magnet 8 is provided, this effect can be further secured.

In FIGS. 4 and 5, a permanent magnet 8 having a hollow inside is incorporated in the trap 2 so that the refrigerant can flow through the hollow portion 8a. In this case, foreign matter heavier than the refrigerant is efficiently accumulated in the trap 2 by the action of the difference in specific gravity, and the permanent magnet 8
Since the contact area with the large area can be taken, the capture rate is further improved.

In FIG. 4, the inner diameter of the permanent magnet 8 is made uniform, while in FIG. 5, the downstream diameter of the refrigerant is made small. The diameter on the downstream side is d ₁ <
In the case of the trap of this kind, the size reduced as d ₂ is because a large amount of foreign matters gather near the open portion of the pipe 7a.
It has a large diameter. By doing so, the inner diameter can be made the same when the iron-based foreign matter 9 is adsorbed.

FIG. 6 is an example of a refrigeration cycle in which the condenser is an iron material, and is an example in which the condenser 3 is magnetized to substitute for the trap. The magnetized iron-based condenser 3 adsorbs the iron-based foreign matter 9 in the refrigeration cycle, and the magnetic force acts on the iron material existing in the vicinity of the condenser 3, so that a small iron-based object is generated around the condenser 3. When it is present and needs to be prevented from adsorbing to the magnetized iron-based condenser 3, it has excellent breathability,
The condenser is wrapped with a magnetic blocking film 10 made of a material having a high thermal conductivity that does not deteriorate the heat dissipation performance of the condenser.

FIG. 7 shows that a drainage condenser having a radiator function is provided in the refrigeration cycle, and the drainage condenser 1 thereof is provided.
1 is an example of a refrigeration cycle in which an iron material is used, and like the embodiment of FIG. 6, the drainage condenser 11 is magnetized to adsorb the iron-based foreign matter 9.

In addition, HFC such as HFC-134a, which does not contain chlorine in the refrigerant of the refrigeration cycle equipped with the trap 2 described above.
The effect of the present invention is more prominent when a system refrigerant is used.

In the embodiment of FIGS. 6 and 7, the iron-based foreign substance 9
In the state in which is adsorbed, the resistance of the flow of the refrigerant is slightly increased compared to the state in which it is not adsorbed. No refrigeration cycle processing is required. Further, since a larger adsorption surface area can be secured as compared with the trap 2, the adsorption effect is improved. Regarding the step of magnetizing the condenser, if the condenser is magnetized and then incorporated into the refrigeration cycle, the refrigeration cycle inhibiting substance may increase. Therefore, the condenser is magnetized after completion of the refrigeration cycle.

[0036]

As described above, according to the present invention, in the refrigerating cycle of the refrigerator, the refrigeration cycle is configured so that the iron-based foreign matter is trapped in the forward path of the capillary tube so that the iron-based foreign matter does not flow into the capillary tube. It is possible to prevent the clogging of the capillary tube due to the iron-based foreign matter. Furthermore, the trap has a structure that does not resist the flow of the refrigerant, and it is possible to prevent cycle clogging in the trap itself and improve the reliability of the refrigeration cycle.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a refrigeration cycle system such as a refrigerator equipped with the present invention.

FIG. 2 is a detailed view of part A in FIG.

FIG. 3 is a detailed view of an A portion of FIG. 1, showing an embodiment different from that of FIG.

FIG. 4 is a view corresponding to details of part A in FIG. 1, showing an embodiment different from those in FIGS. 2 and 3;

5 is a diagram corresponding to detail A of FIG. 1, showing an embodiment different from FIG. 4;

FIG. 6 is a system explanatory view of a refrigeration cycle using an iron-based drainage condenser of the present invention.

7 is an explanatory diagram showing an example in which the present invention is applied to a refrigeration cycle different from that in FIG.

FIG. 8 is a system explanatory view of a refrigeration cycle of a conventional example.

FIG. 9 is a detailed explanatory diagram of the item number 23 in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Compressor, 2 ... Capture device, 3 ... Condenser, 4 ... Dryer, 5 ... Capillary tube, 6 ... Evaporator, 7 ... Piping, 8 ... Permanent magnet, 9 ... Iron system foreign material, 10 ... Magnetic blocking film, 11 ... Drainage condenser.

Claims (9)

[Claims] 1. In a refrigeration cycle in which a compressor, a condenser, a dryer, a capillary tube, and an evaporator are sequentially connected in series in an annular shape by a pipe, in the middle of the pipe between the discharge side of the compressor and the capillary tube, Alternatively, a refrigerating cycle such as a refrigerator characterized in that a trap having a diameter larger than the inner diameter of one of the piping pipes is provided to trap a substance having a large specific gravity mixed in the refrigerating cycle. 2. The trap provided between the compressor discharge side and the capillary tube, wherein the discharge side is provided at the bottom of the trap and the other side is provided at a position apart from the bottom. Refrigeration cycle such as the refrigerator described in 1. 3. A capture device provided between the discharge side of the compressor and the capillary tube is used to capture the iron-based foreign matter in the cycle by using magnetic force. Refrigerating cycle such as refrigerator. 4. The discharge side pipe connected to the trap and the suction side pipe are overlapped to prevent the refrigerant containing the foreign matter from the discharge side pipe from directly entering the suction side pipe. Refrigeration cycle such as the refrigerator described. 5. A refrigerating cycle for a refrigerator or the like according to claim 1, wherein the permanent magnet provided in the trap has a hollow interior, and a refrigerant containing foreign matter flows through the hollow portion. 6. A refrigerating cycle for a refrigerator or the like according to claim 1 or 5, characterized in that the diameter of the inner hollow hole provided in the permanent magnet is made smaller toward the downstream side with respect to the flow of the refrigerant. . 7. The refrigerating cycle for a refrigerator or the like according to claim 1, wherein the trap is used as a muffling tank provided in the middle of the discharge side pipe of the compressor. 8. A refrigerant for a refrigeration cycle equipped with a trap is HF.
A refrigerating cycle for a refrigerator or the like according to claim 1 or 3, wherein an HFC-based refrigerant such as C-134a is used. 9. A refrigerating cycle for a refrigerator or the like, characterized in that the material of the condenser is iron-based, and the iron-based condenser is magnetized so that the whole or a part of the condenser serves as a trap.