JP3955973B2 - Flare fitting - Google Patents

Description

BACKGROUND OF THE INVENTION
The present invention relates to a flare pipe joint for connecting flare pipes to each other or connecting a flare pipe to another pipe material.
[0001]
[Prior art]
Normally, a refrigerant circuit is provided in a cooler, a refrigerator or other refrigeration apparatus. In this refrigerant circuit, a copper tube having a high thermal conductivity is generally used. And the flare pipe coupling 90 shown in FIG. 9 and FIG. 10 is used for the connection location of a copper pipe.
[0002]
The flare pipe joint 90 includes a joint main body 91 and a flare nut 02 screwed into the joint main body 91. Both the joint main body 91 and the flare nut 92 are formed with tapered surfaces. And between these taper surfaces, the flare part 501 of the flare pipe | tube 500 by which the edge part was made into flare shape is clamped. Accordingly, it is possible to prevent the flare portion 501 from being detached from the flare pipe joint 90 and to maintain the airtightness between the flare pipe 500 and the flare pipe joint 90.
[0003]
[Problems to be solved by the invention]
In recent years, the movement of environmental protection has been activated, and in the refrigeration equipment, research and development has been carried out to use “R410A”, “R600”, “carbon dioxide” and other refrigerants as alternative refrigerants for “R22”. Yes. However, these alternative refrigerants have a higher environmental protection effect than “R22”, but need to have a significantly higher pressure (for example, about 1.5 times in the case of “R410A”).
[0004]
Here, when the refrigerant sealed in the flare pipe 500 is set to a high pressure, vibration caused by the compression of the refrigerant by the compressor and the passage of the refrigerant is given to the contact surface (contact surface) between the flare pipe 500 and the flare pipe joint 90. The influence cannot be ignored. As one specific example, a gap is generated in the contact surface between the flare portion 501 and the flare fitting 90, so that the refrigerant enters the space A through the gap, and the refrigerant that has entered the space A The flare pipe 500 is pushed out to the flare pipe joint 90. As another specific example, since the flare portion 501 is originally a portion formed by processing the tip of a pipe having the same diameter, the tissue density is lower than that of the straight portion 502 of the flare tube 500. . For this reason, there is a risk that the vibration transmitted to the flare portion 501 causes a tissue destruction of the flare portion 501 and the flare portion 501 is divided in the middle. Due to the above factors and other various factors, if the flare pipe joint 90 is removed from the flare pipe 500, the refrigerant leaks out of the refrigerant circuit. In particular, when the refrigerant is flammable, there is a possibility of explosion, which is very dangerous.
[0005]
Accordingly, the present invention has been devised, and it is an object of the present invention to provide a flare pipe joint capable of improving the pressure resistance performance and further improving the airtight performance.
[0006]
[Means for solving the problems and effects of the invention]
In order to achieve this object, a flare pipe joint according to claim 1 is composed of a joint body and a flare nut that are screwed together to sandwich and fix a flare portion of the flare pipe. A protrusion is formed on the abutting surface of the tube with the flare portion, and the joint body and the flare tube are bitten by biting the protrusion into the flare portion.
[0007]
And since the projection part is formed in the contact surface with the flare part of a joint main part as above-mentioned, it was formed in the contact surface with the flare pipe of a joint main part by the screwing of the flare nut to the joint main part. Since the protruding portion is difficult to flare, the flare tube is bitten by the joint body. Therefore, the flare pipe is less likely to slip out than the flare pipe joint, and the pressure resistance performance of the flare pipe joint can be improved.
[0008]
The flare pipe joint according to claim 1 includes a joint body and a flare nut that are screwed together to sandwich and fix the flare part of the flare pipe, and the flare nut is in contact with the flare part of the flare pipe. A projecting portion is formed on the contact surface, and the flare nut and the flare tube are bitten by biting the projecting portion into the flare portion.
[0009]
And since the projection part is formed in the contact surface with the flare part of a flare nut as above-mentioned, it formed in the contact surface with the flare pipe of a flare nut by the screwing to the joint main part of a flare nut. Since the protruding portion is difficult to flare, the flare tube is bitten by the threaded body. Therefore, the flare pipe is less likely to slip out than the flare pipe joint, and the pressure resistance performance of the flare pipe joint can be improved.
[0010]
The flare pipe joint according to claim 1, wherein the joint body has a protrusion formed on a contact surface with the flare portion of the flare pipe, and the joint body and the flare pipe are inserted into the flare portion by the protrusion. And are bitten.
[0011]
As a result, in addition to the effects described above , since the protrusion is formed on the contact surface of the joint body with the flare pipe, the flare pipe is less likely to slip out of the flare pipe joint, and the pressure resistance performance of the flare pipe joint There is an effect that can be further improved.
[0012]
According to a second aspect of the present invention, in the flare pipe joint according to the first aspect, the top of the protrusion is formed in a curved shape.
[0013]
Thereby, in addition to the effect which the flare pipe joint of Claim 1 shows, since the top part of a projection part is formed in the shape of a curved surface, when a projection part is difficult to flare pipe, it cuts into a flare pipe by a projection part. As a result, there is an effect that the flare tube can be prevented from being cut off at the position where the protrusion is recessed.
[0014]
According to the first aspect of the present invention, the protrusion is formed in an annular shape.
[0015] Thus, in addition to the above effects, since the protrusion is formed in an annular shape along the circumferential direction of the joint body or the flare nut, even when the internal pressure is high, then the boundary of bite position, the refrigerant Leakage can be prevented, and as a result, airtight performance can be improved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Of course, the following embodiments are merely illustrative of the preferred embodiments of the present invention, and the technical scope of the present invention is not limited to the following embodiments themselves. It is not limited to the “standard” flare pipe joint, and may be “JIS standard” or “inch standard”. Needless to say, the present invention is also applicable to non-standard flare fittings.
[0017]
FIG. 1 is a cross-sectional view of a flare pipe joint 100 and a flare pipe 500 connected to the flare pipe joint 100 according to an embodiment of the present invention. FIG. It is an expanded sectional view of a contact portion. A flare pipe joint 100 shown in FIGS. 1 and 2 is made of a material having higher strength than copper, such as brass, and includes a joint body 1 and a flare nut 2 screwed into the joint body 1. Yes.
[0018]
The joint body 1 has a protrusion 1b formed annularly along the outer periphery of the joint body 1 with respect to the tapered surface 1a that is a contact surface with the flare pipe 500 (because FIG. 1 is a sectional view). , Only a part of which is shown). Therefore, as the flare nut 2 is screwed into the joint body 1, the protruding portion 1 b is squeezed into the flare part 501 of the flare tube 500, and the flare part 501 can be engaged with the joint body 1. As a result, even when the internal pressure of the flare pipe 500 and the joint main body 1 is increased by using the alternative refrigerant of “R22”, the slippage between the flare pipe 500 and the joint main body 1 can be prevented. Further, since the protruding portion 1b is formed in an annular shape on the tapered surface 1a, even when the tapered surface 1a is somewhat scratched, the protruding portion 1b is difficult to be flared by the flare tube 500. Further, it is possible to prevent the refrigerant from leaking, and to improve the airtightness. These effects are generally obtained when the flare pipe 500 is made of a copper material having a high thermal conductivity and is made of a material having a lower strength than the flare pipe joint 100, so that the protrusion 1 b comes into contact with the flare pipe 500. This is because the flare tube 500 is not easily crushed and easily squeezed.
[0019]
Further, since a plurality of projections 1b are formed (two in this embodiment), even if the projection 1b is slightly damaged with respect to the flare tube 500 by the screwing of the flare nut 2. Thus, leakage of the high-pressure refrigerant can be firmly prevented. Of course, the number of the protruding portions 1b may be necessarily one (one), but a plurality is more preferable.
[0020]
"Second Example"
Next, another embodiment (second embodiment) of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part same as 1st Example, the description is abbreviate | omitted, and only a different part is demonstrated.
[0021]
FIG. 3 is a cross-sectional view of the flare pipe joint 200 of the second embodiment, and FIG. 4 is an enlarged cross-sectional view of a contact portion between the flare pipe joint 200 and the flare pipe 500. As shown in FIG. 3 and FIG. 4, in the flare pipe joint 200, the tapered surface 1 a of the joint body 1 is flat and along the inner circumference of the flare nut 2 with respect to the tapered surface 2 a of the flare nut 2. Thus, a projection 202b is formed. Therefore, as the flare nut 2 is screwed into the joint main body 1, the protrusion 202a is difficult to flare, and the flare nut 500 can be engaged with the flare nut 2.
[0022]
“Third Example”
Next, still another embodiment (third embodiment) of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part same as the said Example, the description is abbreviate | omitted, and only a different part is demonstrated.
[0023]
FIG. 5 is a cross-sectional view of the flare pipe joint 300 according to the third embodiment, and FIG. 6 is an enlarged cross-sectional view of a contact portion between the flare pipe joint 300 and the flare pipe 500. As shown in FIGS. 5 and 6, in the flare pipe joint 300, the protrusion 1 b is formed on the tapered surface 1 a of the joint body 1, while the protrusion 202 b is formed on the tapered surface 2 a of the flare nut 2. ing. Accordingly, not only can the flare tube 500 be prevented from being pulled out, but also leakage of the refrigerant from the contact surface between the flare tube 500 and the joint 100 can be firmly prevented.
[0024]
Further, in order to improve the sealing performance, a seal member made of, for example, an elastic material may be sandwiched between the joint body 100 and the flare pipe 500 or between the flare pipe 500 and the flare nut 2. According to the flare pipe joint 300, in this case as well, the flare pipe 500 and the seal member can be prevented from being pulled out, and further, sliding between the seal member and the flare pipe 500 can be prevented. Also, the sealing property can be enhanced.
[0025]
“Fourth Example”
Next, still another embodiment (fourth embodiment) of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the part same as the said Example, the description is abbreviate | omitted, and only a different part is demonstrated.
[0026]
FIG. 7 is a cross-sectional view of the flare pipe joint 400 of the fourth embodiment, and FIG. 8 is an enlarged cross-sectional view of a contact portion between the flare pipe joint 400 and the flare pipe 500. As shown in FIGS. 7 and 8, in the flare pipe joint 400, a protrusion 402 b is formed on the tapered surface 2 a of the flare nut 2, and the cross-sectional shape of the protrusion 402 b is an arc shape. Accordingly, it is possible to prevent the protruding portion 402b from forming an acute cut in the floor portion 501 of the flare tube 500. As a result, the internal pressure is increased and the influence on the contact surface due to vibration or the like cannot be ignored. In this case, the flare tube 500 can be prevented from being cut off at the position where the projection 402b is formed. In addition, when the flare tube 500 is not sandwiched, when the flare nut 2 is screwed into the joint body 1, the projection 402 b may be crushed or the tapered surface 1 a of the joint body 1 may be damaged. It is also possible to prevent it from falling.
[0027]
Although the present invention has been described above based on the embodiments, it can be easily estimated that various modifications can be made without departing from the spirit of the present invention.
[0028]
For example, in the present embodiment, only the flare tube 500 is sandwiched between the joint body 1 and the flare nut 2. However, for example, a cylindrical rubber sealing member may be disposed between the flare tube 500 and the flare nut 2.
[0029]
In the present embodiment, the protrusion 402 b is formed on the tapered surface 2 a of the flare nut 2. However, the formation position of the protrusion 402b is not limited to the tapered surface 2a of the flare nut 2, but may be the tapered surface 1a of the joint body 1 or both the tapered surfaces 1a and 2a. May be. In this case, it is preferable that the formation position of the projection 402b formed on the joint body 1 side and the formation position of the projection formed on the flare nut 2 side are shifted. By shifting the formation position in this manner, when the flare nut 2 is screwed to the joint body 1, it is possible to prevent the both protrusions 402b from colliding with each other and being crushed.
[0030]
Furthermore, according to the present embodiment, the protrusions 1b, 202b, 402b are each formed in an annular shape. However, it does not necessarily have to be formed in an annular shape, and may be formed only on a part of the tapered surface 1a or 2a when emphasizing prevention of slip-through.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a flare pipe joint that is an embodiment of the present invention.
FIG. 2 is a partially enlarged sectional view of the flare pipe joint.
FIG. 3 is a sectional view of a flare pipe joint of a second embodiment.
FIG. 4 is a partially enlarged cross-sectional view of the flare pipe joint of the second embodiment.
FIG. 5 is a cross-sectional view of a flare pipe joint of a third embodiment.
FIG. 6 is a partially enlarged cross-sectional view of the flare pipe joint of the third embodiment.
FIG. 7 is a cross-sectional view of a flare pipe joint of a fourth embodiment.
FIG. 8 is a partially enlarged cross-sectional view of the flare pipe joint of the fourth embodiment.
FIG. 9 is a cross-sectional view of a prior art flare pipe joint.
FIG. 10 is an external perspective view showing a separated state of the flare pipe and the flare pipe joint.
[Explanation of symbols]
1 Joint body 1a Tapered surface (contact surface)
1b Protruding part 2 Flare nut 2a Tapered surface (contact surface)
100 Flare pipe joint 202b Protrusion part 402b Protrusion part 500 Flare pipe 501 Flare part

Claims (2)

In a flare pipe joint composed of a joint body and a flare nut that are screwed together to sandwich and fix the flare portion of the flare pipe,
The joint body has a protrusion on the contact surface with the flare portion of the flare tube, and the flare nut has a protrusion on the contact surface with the flare portion of the flare tube. And
The protrusion is formed in an annular shape along the circumferential direction of the joint body or flare nut,
The protrusion on the joint body side and the protrusion on the flare nut side are provided in a manner that does not interfere with each other,
The flare pipe is made of a copper pipe, and the joint body and the flare nut are made of brass,
The flare pipe joint, wherein the joint body and the flare pipe are bitten by biting the protrusion into the flare part. Flare fittings mounting serial to claim 1 in which the top portion of the protrusion is characterized by being formed into a curved shape.
[0001]

Images