JPH04132372U - capillary tube - Google Patents

Abstract

(57) [Summary] [Purpose] To delay the occurrence of clogging as much as possible without increasing the length of the capillary tube. [Structure] In a capillary tube used as a decompression mechanism of a refrigeration system, a spiral groove 12 is formed on the inner surface of a tube body 11.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a capillary tube used as a decompression mechanism in a refrigeration system. It is something that

0002

[Conventional technology]

As shown in Fig. 4, a commonly used refrigeration system includes a compressor 1, a condenser 2 , the capillary tube 3 and evaporator 4, which act as a pressure reducing mechanism, are connected to refrigerant piping. Conventionally, circuits in which the circuits are connected in sequence to form a closed circulation circuit have been widely used.

0003 The capillary tube 3 used in the refrigeration system configured as described above usually has an inner diameter of A 0.4 to 2.0 mm copper tube is used, and its flow rate control function allows evaporation from the condenser 2. It acts to reduce the pressure of the refrigerant flowing into the container 4 to a predetermined value (for example, (Ref. Refrigeration and Air Conditioning Handbook Basic Edition, 4th Edition, Published by Japan Refrigeration Association).

0004 By the way, the refrigerant system of refrigeration equipment contains charcoal that is produced when used for a long period of time. Chemicals (carbonized lubricating oil, etc.) and small debris circulate with the refrigerant, but the cap Since the inner diameter of the capillary tube is extremely small, it may accumulate on the inner surface of the capillary tube. This may cause clogging. The occurrence of such clogging is caused by the capillary This will impair the flow rate control function of the tube, so countermeasures against clogging are required. It is becoming.

[0005] In order to eliminate clogging of the capillary tube as described above, increase the inner diameter. However, in that case, in order to obtain the desired depressurization effect, it is necessary to It becomes necessary to lengthen the retube, which increases installation space and costs. A problem arises in that it is also disadvantageous.

[0006]

[Problem that the idea aims to solve] The present invention was made in order to solve the above problems, and it In order to delay the occurrence of clogging as much as possible without increasing the length of the tube. The purpose is to

[0007]

[Means to solve the problem]

In the invention of claim 1, as a means for solving the above problem, as shown in the drawings, In capillary tubes used as pressure reduction mechanisms in refrigeration equipment, the tube body A spiral groove 12 is formed on the inner surface of 11.

[0008] In the invention of claim 2, as a means for solving the above problem, as shown in the drawings, In the capillary tube according to claim 1, the groove 12 is formed in the tube body 1. It is formed by corrugating processing for 1.

[0009]

[Effect]

In the invention of claim 1 or 2, the following effects can be obtained by the above means. .

0010 That is, the groove 12 formed on the inner surface of the tube body 11 (for example, by corrugating) The inner diameter can be increased because the concave groove) provides a greater pressure reducing effect than a smooth inner tube. Even if it does, there is no need to increase the length dimension so much. Also, inside the refrigerant system Carbide and dirt flowing with the refrigerant adhere and accumulate in the grooves, causing visual damage. The occurrence of clogging can be significantly delayed.

[0011]

[Effect of the idea]

According to the invention of claim 1, a capillary cell used as a pressure reduction mechanism of a refrigeration device In the tube, a spiral groove 12 is formed on the inner surface of the tube body 11 to form a tube with a smooth inner surface. Since it has been designed to provide a greater decompression effect than the previous one, even if the inner diameter is increased There is no need to increase the length dimension too much, and the refrigerant can flow together with the refrigerant in the refrigerant system. As a result, carbide and dirt flowing through the grooves adhere and accumulate in the groove 12, resulting in the installation space being reduced. The cost-effective structure reduces the occurrence of clogging without increasing the space. This can greatly contribute to improving the reliability of capillary tubes. It has a practical effect.

0012 According to the invention of claim 2, in the capillary tube of claim 1, the concave groove is 12 is formed by corrugating the tube body 11, so that the thin tube Concave grooves can be easily formed on capillary tubes, which improves productivity and improves productivity. This has the practical effect of reducing production costs and production costs.

[0013]

【Example】

Hereinafter, some preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0014] Example 1 FIG. 1 shows a capillary tube according to Example 1 of the present invention. Book The embodiment corresponds to the invention of claims 1 and 2.

[0015] The capillary tube of this example can also be used as a decompression mechanism in the refrigeration system shown in Figure 4. The inner surface of the tube body 11 has a spiral shape formed by corrugating. A concave groove 12 is formed. In other words, the tube wall of the tube body 11 is uneven in the axial direction. The shape is said to be Here, the inner diameter D of the tube body 1 is 1.6 mm, and the concave groove 12, the depth h=0.06D.

[0016] With the above configuration, the presence of the spiral groove 12 allows the tube to have a smooth inner surface. Since a larger depressurizing effect can be obtained compared to the This eliminates the need to make the length dimension too large, and allows the refrigerant to be used in the refrigerant system. Carbide and dust flowing together will adhere and accumulate in the groove 12. Therefore, Eliminates clogging due to cost-effective configuration that does not require large installation space The outbreak can be significantly delayed.

[0017] By the way, the capillary tube made of a pipe with a processed inner surface and the one with a flat inner surface in this example. When using a capillary tube consisting of a smooth tube (hereinafter referred to as a comparative example), Therefore, the relationship between the inner diameter D (mm) and the length dimension L (mm) when a predetermined pressure reducing effect is obtained. When investigating the relationship, the results shown in Figure 5 were obtained.

[0018] According to this, when the inner diameter D = 1.6 mm, in the case of the comparative example, L = 4200 In contrast to the required length of mm, in the case of this example, L=1000 mm It turns out that the length of is sufficient. In other words, in terms of the required length dimension, the one in this example This is extremely advantageous.

[0019] Example 2 FIG. 2 shows a capillary tube according to a second embodiment of the present invention. This embodiment corresponds to the invention of claim 1.

[0020] In the case of this embodiment, a flexible tube type is used as the tube body 11. has been done. That is, the groove 12 is formed by folding the tube wall of the tube body 11. There is.

[0021] This embodiment also has the same effects as the first embodiment.

[0022] Example 3 FIG. 3 shows a capillary tube according to Example 3 of the present invention. This embodiment corresponds to the invention of claim 1.

[0023] In the case of this embodiment, several spiral ribs 13, 13, etc. are formed on the inner surface of the tube body 11. By doing so, a groove 12 is formed between adjacent spiral ribs 13, 13. ing.

[0024] This embodiment also has the same effects as the first embodiment.

[0025] The invention of the present application is not limited to the configurations of the above embodiments, and does not deviate from the gist of the invention. Of course, the design can be changed as appropriate within a range that does not deviate from the above.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view of a capillary tube according to Example 1 of the present invention.

FIG. 2 is a partially enlarged sectional view of a capillary tube according to Example 2 of the present invention.

FIG. 3 is a partially enlarged sectional view of a capillary tube according to Example 3 of the present invention.

FIG. 4 is a refrigerant circuit of a general refrigeration system.

FIG. 5 is a characteristic diagram showing the relationship between tube inner diameter and tube length in a capillary tube according to Example 1 of the present invention and a capillary tube of a comparative example.

[Explanation of symbols]

3 is a capillary tube, 11 is a tube body, and 12 is a groove.

Claims (2)

[Scope of utility model registration request] 1. A capillary tube used as a pressure reducing mechanism in a refrigeration system, characterized in that a spiral groove (12) is formed on the inner surface of the tube body (11). 2. The capillary tube according to claim 1, wherein the groove (12) is formed by corrugating the tube body (11).