JPH0442684Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a connection structure for a capillary reach tube in a refrigeration system, specifically a cooling pipe of a heat exchanger in a refrigeration system and a pipe connecting each device of the refrigeration system. This invention relates to a connection structure for connecting a capillary reach tube to a large diameter pipe such as.

(Prior art) Conventionally, when connecting a capillary reach tube to a large diameter pipe of a refrigeration system, for example,
As disclosed in Japanese Patent No. 35361 and shown in FIG. Pinch the outer peripheral wall at the end on the tube insertion side to form the large diameter tube 4.
A brazing process R is performed between the side end portion of the capillary reach tube 5 and the capillary reach tube 5.

By the way, the above-mentioned connection means requires pinch processing P and brazing processing R, and is very inefficient, especially when connecting the capillary reach tube 5 to a cooling pipe of a heat exchanger, etc. In addition, when employing the connection means, a plurality of cooling pipes are installed in the heat exchanger, and it is necessary to connect the capillary reach tube 5 to each cooling pipe separately. It is necessary to perform the brazing process R several times in a narrow place, making the connection work very complicated.Moreover, the connection means does not connect the cable to the inside of the large diameter pipe 4 such as the cooling pipe. There were problems such as difficulty in setting the insertion depth of the pillar reach tube 5.

Furthermore, conventionally, a connecting means is provided in which a socket for connecting the capillary reach tube 5 and the large diameter tube 4 is separately manufactured, and the capillary reach tube 5 and the large diameter tube 4 are connected via this socket. However, with such a connecting means, the above-mentioned pinching process is not necessary, and the large diameter pipe 4 and the capillary reach tube can be connected by simply brazing between the socket and the large diameter pipe 4. 5, which has the advantage of improving workability, but since the socket is required separately, the number of component parts increases, resulting in higher costs. be.

Therefore, as shown in FIG. 4, the large diameter pipe 4
A bulging portion 4a that bulges outward in the radial direction is integrally formed at the connecting end of the capillary reach tube 5, and the inner diameter of the bulging portion 4a of the large diameter tube 4 is integrally formed at the connecting end of the capillary reach tube 5. A funnel-shaped bulge 5a having an outer diameter comparable to that of , 5a are brazed R to connect the capillary reach tube 5 to the large diameter tube 4.

However, when adopting the above connection means,
Compared to the case shown in FIG. 3, pinch processing is not required, and connection workability can be improved, and the cost can be lowered compared to the case where the socket is used.

(Problems to be Solved by the Invention) By the way, in the connection means shown in FIG. Large diameter pipe 4
Because it is inserted into the bulge 4a of the
When dust or the like is mixed in the refrigerant passing through the large-diameter pipe 4, this dust or the like reaches the inside of the capillary reach tube 5 from the bulging portion 5a together with the refrigerant, and the capillary reaches the inside. There was a problem that caused tube 5 to become clogged.

The present invention was devised in view of the above-mentioned problems, and the purpose is to simplify the connection work by making a simple design change to the capillary reach tube, and to reduce the cost. An object of the present invention is to provide a connection structure for a capillary reach tube that can reliably prevent clogging of the tube with dirt or the like.

(Means for Solving the Problems) As shown in the embodiment of the drawings, the present invention provides a capillary reach tube 5 for a large diameter pipe 4 in a refrigeration system.
In this connection structure, a bulging portion 5a having an outer diameter comparable to the inner diameter of the connecting portion of the large-diameter tube 4 is formed at the connecting end of the capillary reach tube 5, and A small diameter portion 5b is provided on the tip side of the protruding portion 5a.
The large diameter tube 4 is provided in the bulged portion 5a.
and a dirt collecting portion 5c is formed around the small diameter portion 5b.
It is characterized by the formation of

(Function) However, when using the above connection structure, the bulging portion 5a of the capillary reach tube 5 is connected to the large diameter tube 4.
By inserting the capillary reach tube 5 into the large diameter tube 4 and brazing between the large diameter tube 4 and the bulging portion 5a, the capillary reach tube 5 and the large diameter tube 4 can be easily connected without the need for a socket or the like. This is very convenient when the capillary reach tube 5 is connected to a plurality of cooling pipes, etc., which are piped to a heat exchanger, respectively. A small diameter portion 5b is integrally formed at the tip, and a dirt collection portion 5c is formed between the small diameter portion 5b and the large diameter tube 4, so that the refrigerant passing through the large diameter tube 4 is The dirt mixed in the capillary reach tube 5 is removed by the dirt reservoir 5c, and clogging of the capillary reach tube 5 is prevented.

(Example) The connection structure of a capillary reach tube in a refrigeration apparatus according to the present invention will be described below with reference to an example shown in the drawings.

Figure 2 shows a refrigeration system using a capillary reach tube, in which 1 is a compressor;
2 is a condenser, 3 is an evaporator, and these devices are connected by a refrigerant pipe 4, that is, a large diameter pipe 4 in the present invention, to form a refrigeration cycle, and the condenser 2 and the evaporator A capillary reach tube 5 is connected to an intermediate portion of the large diameter tube 4 between the large diameter tube 3 and the large diameter tube 4.

Therefore, the connection structure for connecting the capillary reach tube 5 to the large diameter pipe 4 was constructed as follows.

That is, as shown in detail in FIG. 1, a first bulging portion 4a whose diameter expands radially outward is integrally formed at the end of the large diameter tube 4 on the connection side of the capillary reach tube 5. , a second bulge 5 having an outer diameter approximately the same as the inner diameter of the first bulge 4a is provided at one end in the length direction of the capillary reach tube 5.
a is integrally formed, and the second bulging portion 5a is inserted into the first bulging portion 4a.
The capillary reach tube 5 is integrally connected to the large diameter pipe 4 by brazing R between the capillary reach tube a and the outer circumferential wall of the capillary reach tube 5.

Further, when connecting the capillary reach tube 5 to the large diameter tube 4, an inclined wall 4 formed between the outer peripheral wall of the large diameter tube 4 and the first bulging portion 4a
b is inserted until the inclined wall 5d formed between the second bulging portion 5a of the capillary reach tube 5 and the small diameter portion 5b comes into contact with each other. The insertion depth into the large diameter pipe 4 can be easily set.

Then, a small diameter portion 5b having a smaller diameter than the bulge portion 5a is integrated with the tip side of the second bulge portion 5a provided in the capillary reach tube 5 toward the center of the axis of the large diameter tube 4. This large diameter pipe 4 is formed protruding from the
A dust collection portion 5c is provided in a space formed between the inner peripheral wall of the small diameter portion 5b and the outer peripheral wall of the small diameter portion 5b.

By doing so, it is possible to remove the dirt a etc. that passes through the inside of the large diameter pipe 4 together with the refrigerant in the waste collection portion 5c, and prevent the inside of the large diameter pipe 4 from becoming clogged. be.

Further, when manufacturing the capillary reach tube 5, a tube body having an outer diameter of the bulged portion 5a is usually used, and this tube body is stretched to a small diameter to form the capillary reach tube 5. Therefore, even when forming the small diameter portion 5b at the tip of the bulging portion 5a, the small diameter portion 5b can be easily formed by performing the stretching process in the same manner as described above.

In the embodiment shown in FIG. 1, a large-diameter beading portion 5e is provided at the end of the capillary reach tube 5 on the side opposite to the side on which the bulging portion 5a is formed.
When connecting the other end of the capillary reach tube 5 to the large diameter tube 4, the large diameter tube 4 is inserted into the beaded portion 5e, and the capillary reach tube 5 is connected to the large diameter tube 4. and large diameter pipe 4
I am trying to connect with.

(Effect of the invention) As explained above, in the connection structure of the capillary reach tube in the refrigeration apparatus according to the present invention, the connection side end of the capillary reach tube 5 has an outer diameter that is approximately the same as the inner diameter of the connection part of the large diameter pipe 4. At the same time, a small diameter part 5b is provided on the distal end side of the bulge part 5a, and is connected to the large diameter tube 4 at the bulge part 5a, and a small diameter part 5b is formed around the small diameter part 5b. Since the dust collecting portion 5c is formed, the connection work between the capillary reach tube 5 and the large diameter pipe 4 can be done easily at low cost compared to the conventional one, and in particular, it is possible to connect the capillary reach tube 5 and the large diameter pipe 4 easily at low cost. This is very convenient when the capillary reach tube 5 is connected to a plurality of cooling pipes, and moreover, it is possible to form a dirt collection portion 5c between the capillary reach tube 5 and the large diameter pipe 4. By doing so, it is possible to remove the dirt mixed in the refrigerant passing through the inside of the large diameter pipe 4 in the dirt storage section 5c, and to prevent clogging in the capillary reach tube 5. It's ivy.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view showing the connection structure of the capillary reach tube according to the present invention, Fig. 2 is a refrigeration cycle diagram showing a refrigeration system to which the same connection structure is applied, and Figs. 3 and 4 are respectively conventional It is a sectional view showing an example. 4... Large diameter tube, 5... Capillary reach tube,
5a...Bulging part, 5b...Small diameter part, 5c...Dust collecting part.

Claims (1)

[Scope of utility model registration request] This is a connection structure for connecting a capillary reach tube 5 to a large diameter tube 4 in a refrigeration system, and the large diameter tube 4 is connected to the connection side end of the capillary reach tube 5.
The bulging portion 5a has an outer diameter comparable to the inner diameter of the connecting portion.
At the same time, a small diameter part 5b is provided on the distal end side of the bulging part 5a, and it is connected to the large diameter pipe 4 at the bulging part 5a, and a dirt collecting part 5c is formed around the small diameter part 5b. A connection structure of a capillary reach tube in a refrigeration system characterized by: