JP2015048913A - Joint for refrigerant pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint for a refrigerant pipeline which prevents current corrosion from occurring in the pipeline and a joint body.SOLUTION: A joint body 2 is formed by a body part 3 and a removal stopper member 4. A through hole 3b through which a refrigerant flows is formed in the body part 3. An installation hole part 3g at which seal members 7, 9 are installed is formed at an opening part side end part of the through hole 3b. The removal stopper member 4 is threadedly engaged with a right end part of the body part 3, at which the installation hole part 3g is opened, to be fixed thereto. An insertion hole 4b, into which a pipeline T made of aluminium is inserted, is formed at a center part of a bottom part 4a of the removal stopper member 4. The body part 3 and the removal stopper member 4 are made of aluminium that is a metal forming the pipeline T.

Description

  The present invention relates to a refrigerant pipe joint for connecting a refrigerant pipe to another refrigerant pipe, or to connect an outdoor unit or an indoor unit of a cooling device.

  Generally, the joint for refrigerant | coolant piping has a joint main body and the connection nut (connection member) screwed together by this joint main body, as described in the following patent document 1. A passage hole penetrating through the inside of the joint body is formed. A tapered surface is formed on one end face of the joint main body where the passage hole is opened so that the passage hole and the axis coincide with each other. On the other hand, the connecting nut has a cap nut shape and is screwed into one end of the joint body where the passage hole opens.

  When connecting a pipe to the joint body using the joint having the above-described configuration, a flare portion is formed in advance at one end of the pipe. Then, the connecting nut is tightened in a state where the flare portion is pressed against the tapered surface of the joint body. Then, the flare portion is pressed and fixed to the tapered surface, and as a result, the pipe is connected and fixed to the joint body. Of course, in the connected state, the inside of the pipe is communicated with the passage hole.

Japanese Patent Laid-Open No. 2005-42858

  In the conventional joint, the pipe is made of aluminum, whereas the joint body and the connecting nut are made of a metal other than aluminum, for example, brass. For this reason, when rainwater enters between each of the pipe and the joint body and the connecting nut, a current due to electromotive force between different metals flows between them, resulting in a problem that the aluminum pipe is corroded. was there.

In order to solve the above problems, the present invention provides a joint body in which a passage hole through which a refrigerant flows is formed, and a refrigerant pipe made of aluminum is inserted into the passage hole from one end opening thereof, and the passage In a refrigerant pipe joint provided with a seal member provided inside the hole and sealing between the inner peripheral surface of the passage hole and the outer peripheral surface of the pipe, at least the pipe of the joint body The portion constituting the inner peripheral surface of the passage hole located behind the seal member in the insertion direction into the passage hole is made of aluminum.
In this case, the joint body is provided with a mounting hole portion constituting a part of the passage hole at one end portion, and a main body portion provided with the seal member in the mounting hole portion, and one end portion of the main body portion. A retaining member attached to the retaining member, and the retaining member is provided with an insertion hole constituting the opening of the connection hole coaxially with the mounting hole portion, and the inner diameter of the insertion hole is the mounting hole portion. It is desirable that the diameter is set smaller than the inner diameter of the portion where the seal member is provided, and the retaining member and the main body are made of aluminum.
An engagement member that prevents the pipe from coming out of the passage hole by engaging with the pipe inserted into the passage hole is provided inside the passage hole, and the seal member is provided with the pipe. It is desirable that it is arranged behind the engaging member in the direction of insertion into the passage hole.

  According to this invention which has the said characteristic structure, the part which comprises the internal peripheral surface of the channel | path hole among the coupling main bodies is comprised with aluminum. That is, the portion of the joint body that comes into contact with the piping via rainwater or the like is made of aluminum. Therefore, no current flows between contact portions between the pipe and the joint body. Therefore, it can prevent that piping corrodes with an electric current.

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention before a pipe is inserted into a passage hole. FIG. 2 is a cross-sectional view showing the embodiment in a state where the pipe is inserted into the passage hole to a position in the middle of the predetermined position. FIG. 3 is a cross-sectional view showing the embodiment in a state where a pipe is inserted to a predetermined position. FIG. 4 is an exploded perspective view of the same embodiment. FIG. 5 is a plan view showing an engaging member used in the embodiment. 6 is a view taken in the direction of arrow X in FIG. FIG. 7 is a perspective view of the engaging member. FIG. 8 is a sectional view showing a second embodiment of the present invention. FIG. 9 is a cross-sectional view showing a third embodiment of the present invention. FIG. 10 is a cross-sectional view showing a fourth embodiment of the present invention.

The best mode for carrying out the present invention will be described below with reference to the drawings.
1 to 7 show a first embodiment of the present invention. As shown in FIG. 1 to FIG. 3, the refrigerant pipe joint 1 of this embodiment has refrigerant pipes T (only one pipe T shown) connected to both ends thereof, whereby two pipes T are connected. It is for connection. The pipe T is made of aluminum.

Corresponding to the fact that the pipe T is arranged with the longitudinal direction thereof oriented in the left-right direction, the joint 1 is arranged with the longitudinal direction thereof directed in the left-right direction of FIG. Moreover, the joint 1 is configured symmetrically. Therefore, for the joint 1, only the configuration of the right portion will be described, and for the left portion, the same reference numerals are given to the same configurations as those of the right portion, and description thereof will be omitted. For convenience of explanation, the joint 1 will be described using the left and right of FIG. Of course, the present invention is not limited to such a direction. In addition, the joint 1 is arranged with the longitudinal direction thereof oriented in the horizontal direction, but may be arranged with the longitudinal direction directed in the up-down direction or in the oblique direction.

  The joint 1 has a joint body 2. The joint main body 2 includes a main body portion 3 that is horizontally disposed with its longitudinal direction facing the left-right direction, and a retaining member 4 that is screwed and fixed to the right end portion of the main body portion 3. The main body 3 may be arranged with the longitudinal direction thereof directed in the up-down direction or may be arranged in the oblique direction.

  The main body 3 is made of aluminum, which is the same metal as the pipe T, and is formed in a bar shape with a circular cross section, as shown in FIGS. The cross-sectional shape of the main body 3 is not limited to a circle, and the shape is arbitrary. A male screw portion 3 a is formed at the right end portion of the outer peripheral surface of the main body portion 3. A through hole 3b is formed in the main body 3 so as to penetrate the axis from the left end surface to the right end surface.

  A retaining member 4 is screwed and fixed to the male screw portion 3a. The retaining member 4 is made of aluminum, which is the same metal as the pipe T, and is formed in a bottomed cylindrical shape as shown in FIGS. The retaining member 4 is screwed into the male screw portion 3 a until the bottom portion 4 a abuts against the right end surface of the main body portion 3, thereby being fixed to the main body portion 3. The bottom 4a is formed with an insertion hole 4b penetrating therethrough. The insertion hole 4b is arranged such that its axis coincides with the axis of the through hole 3b. The inner diameter of the insertion hole 4b is set to be approximately the same as or slightly larger than the outer diameter of the pipe T so that the pipe T can be inserted into the insertion hole 4b. A passage hole is formed by the insertion hole 4b and the through hole 3b.

As shown in FIGS. 1 to 3, a positioning protrusion 3c is formed in an annular shape on the inner peripheral surface of the through hole 3b. The positioning protrusion 3 c is disposed at the center in the longitudinal direction of the main body 3. Therefore, the joint 1 is configured symmetrically about the center in the width direction of the positioning protrusion 3c (longitudinal direction of the through hole 3b).

A fitting hole portion 3d, a relief hole portion 3e, a screw hole portion 3f, and a mounting hole portion 3g are sequentially formed in a portion of the through hole 3b that continues to the right side from the positioning protrusion 3c. Of course, the fitting hole portion 3d, the escape hole portion 3e, the screw hole portion 3f, and the mounting hole portion 3g are arranged with their axes aligned with each other.

The pipe T is detachably fitted into the fitting hole 3d. Therefore, the inner diameter of the fitting hole 3d is set to be substantially the same as or slightly larger than the outer diameter of the pipe T. The inner diameter of the escape hole 3e is set to be slightly larger than the inner diameter of the fitting hole 3d. The inner diameter of the screw hole portion 3f is set to be slightly larger than the inner diameter of the escape hole portion 3e. A step surface 3h is formed in an annular shape between the escape hole 3e and the screw hole 3f. The step surface 3h is constituted by a plane orthogonal to the axis of the through hole 3b. The step surface 3h may be inclined by a slight angle. The mounting hole 3g is set to have a slightly larger diameter than the screw hole 3f. A portion of the right end opening of the mounting hole 3g excluding the central portion facing the insertion hole 4b, that is, an outer peripheral portion of the right end opening of the mounting hole 3g is closed by the bottom 4a of the retaining member 4. Yes.

A stopper 5 is screwed and fixed to the screw hole 3f. The stopper 5 is made of brass, but may be made of aluminum which is the same metal as the pipe T. The stopper 5 is formed in a cylindrical shape, and the inner diameter thereof is set to be substantially the same as or slightly larger than the outer diameter of the pipe T. Accordingly, the pipe T can pass through the stopper 5. The stopper 5 is spaced apart from the step surface 3h to the right. Therefore, an annular space is formed in a portion of the screw hole portion 3f located between the stopper 5 and the step surface 3h. An engaging member 6 is provided in this space.

The engaging member 6 is made of a strong metallic plate material such as steel, and is formed in a ring shape as shown in FIGS. An annular plate portion 6 a that is continuous in the circumferential direction is formed on the outer peripheral portion of the engaging member 6. The annular plate portion 6a is arranged with its thickness direction oriented in a direction perpendicular to the axis of the through hole 3b. The thickness of the annular plate portion 6 a is thinner than the distance between the step surface 3 h and the stopper 5. Therefore, the annular plate portion 6a, and thus the engaging member 6, can move in the axial direction of the through hole 3b by the difference between the distance between the step surface 3h and the stopper 5 and the thickness of the annular plate portion 6a. . The outer diameter of the annular plate portion 6a is set slightly smaller than the inner diameter of the screw hole portion 3f. Therefore, the annular plate portion 6a (engagement member 6) can move in the radial direction of the screw hole portion 3f by the difference between the inner diameter of the screw hole portion 3f and the outer diameter of the annular plate portion 6a. The inner diameter of the annular plate portion 6a is set larger than the outer diameter of the pipe T. Therefore, the pipe T can pass through the annular plate portion 6 a and the engaging member 6.

The annular plate portion 6a is not necessarily provided so as to be movable as described above, and may be fixed to the stepped surface 3h or the left end surface of the stopper 5 facing the step surface 3h by bonding or other fixing means. However, when fixing in such a manner, it is necessary to make the axis of the annular plate portion 6a coincide with the axis of the screw hole 3f, that is, the axis of the through hole 3b. This is because the pipe T can easily pass through the engaging member 6.

A large number of biting teeth 6b projecting radially inward are formed integrally with the annular plate portion 6a on the inner peripheral portion of the annular plate portion 6a. The biting tooth 6b is inserted forward in the insertion direction into the through hole 3b of the pipe T toward the radially inner side of the engagement member 6 so that the distal end portion (the radially inner end portion) is positioned forward of the proximal end portion. It is inclined to head toward. Therefore, in a state where the annular plate portion 6a hits the stepped surface 3h, the biting tooth 6b enters the escape hole portion 3e.

  The diameter of the inscribed circle in contact with the tip of each biting tooth 6b is set to be smaller than the outer diameter of the pipe T. Therefore, when the pipe T is inserted into the through hole 3b, as shown in FIG. 2, the intersecting portion between the outer peripheral surface and the end face of the pipe T abuts on the intermediate portion in the longitudinal direction of each biting tooth 6b. When the pipe T is further inserted into the through hole 3b, the engaging member 6 is moved to the left, and the annular plate portion 6a hits the step surface 3h. As a result, the engaging member 6 stops. Thereafter, when the pipe T is further inserted, each biting tooth 6b is pushed leftward and elastically deformed, and the diameter of the inscribed circle in contact with each biting tooth 6b is increased. When the diameter of the inscribed circle becomes equal to the outer diameter of the pipe T, the pipe T passes through the engagement member 6 (annular plate portion 6a). At this time, the leading end portion of each biting tooth 6b is in sliding contact with the outer peripheral surface of the pipe T.

Since the outer diameter of the annular plate portion 6a is set slightly smaller than the inner diameter of the screw hole portion 3f, the engaging member 6 can move in the radial direction of the screw hole portion 3f. Therefore, when the pipe T is moved to the left in a state where the pipe T is in contact with the biting teeth 6b, the engaging member 6 is moved in the radial direction by the automatic centering action of the inclined biting teeth 6b, The axis of the engagement member 6 is made to coincide with the axis of the pipe T. Therefore, the pipe T can easily pass through the engaging member 6.

  As shown in FIG. 3, the pipe T is inserted into the through hole 3b (fitting hole 3d) until it abuts against the right end surface of the positioning protrusion 3c. After that, when the pipe T is moved rearward in the insertion direction (opposite to the insertion direction; rightward in FIG. 3), the tip of the biting tooth 6b bites into the outer periphery of the pipe T. When the pipe T is further moved rearward, the annular plate portion 6a of the engaging member 6 abuts against the stopper 5 and cannot be moved further rearward. If the pipe T is to be moved further rearward in this state, the biting teeth 6b bite into the outer periphery of the pipe T. As a result, the rearward movement of the pipe T is blocked by the engaging member 6, and the pipe T is connected to the through hole 3b (passage hole) in a retaining state.

Here, the pipe T is pulled rightward with a large force, and as a result, the amount of biting of the biting teeth 6b into the pipe T increases, the inclination angle increases, and the inclination angle becomes perpendicular to the axis of the engaging member 6. After that, when the biting teeth 6b are inclined to the right (hereinafter referred to as the inside-out state), the stopping force against the pipe T by the biting teeth 6b disappears, and the pipe T comes out of the through hole 3b to the right. End up. In order to prevent such inconvenience, the left end surface of the stopper 5 is formed with a support protrusion 5a that protrudes leftward. The support protrusion 5 a extends in an annular shape about the axis of the stopper 5. The inner peripheral surface of the support protrusion 5 a is set to be the same as the inner peripheral surface of the stopper 5. The outer peripheral surface of the support protrusion 5a is formed in a tapered shape so as to have a smaller diameter toward the left. The taper angle of the outer peripheral surface of the support protrusion 5a is set to be substantially the same as the taper angle of the biting teeth 6b of the engagement member 6. In addition, the support protrusion 5a has a tapered outer peripheral surface biting teeth 6b at the same time or immediately after the engagement plate 6 moves to the right and the annular plate 6a hits the left end surface of the stopper 5. It is arrange | positioned so that it may face against the right side surface. Therefore, when the pipe T is pulled rightward with a large force, the biting teeth 6b hit the outer peripheral surface forming the tapered shape of the support protruding portion 5a, and the biting teeth 6b are prevented from turning over by the support protruding portion 5a. The This reliably prevents the pipe T from coming out of the through hole 3b.

  An inner seal member (seal member) 7, a partition member 8, and an outer seal member (seal member) 9 are sequentially inserted from the stopper 5 toward the bottom portion 4 a of the retaining member 4 in the mounting hole 3 g. The inner seal member 7, the partition member 8 and the outer seal member 9 are prevented from moving leftward by the stopper 5, and are prevented from moving rightward by the bottom portion 4a. Thereby, the inner side sealing member 7, the partition member 8, and the outer side sealing member 9 are provided in the mounting hole 3g so that it cannot escape.

  When the stopper 5, the engaging member 6, the inner seal member 7, the partition member 8 and the outer seal member 9 are incorporated in the main body 3, the engaging member 6 is first inserted into the screw hole from the opening of the mounting hole 3g. Insert in 3f. Next, the stopper 5 is similarly inserted and screwed into the screw hole 3f. Thereafter, the inner seal member 7, the partition member 8, and the outer seal member 9 are inserted into the mounting hole 3g in that order. Finally, the retaining member 4 is screwed and fixed to the main body 3.

The seal members 7 and 9 are made of an elastic material such as rubber, and usually an O-ring is adopted. The outer diameters of the seal members 7 and 9 are set larger than the inner diameter of the mounting hole 3g. The inner diameters of the seal members 7 and 9 are set smaller than the outer diameter of the pipe T. Therefore, when the pipe T is inserted into the through hole 3b, the outer peripheral portions of the seal members 7 and 9 are pressed against the inner peripheral surface of the mounting hole portion 3g, and the inner peripheral surfaces of the seal members 7 and 9 are the outer peripheral surface of the pipe T. Press contact. Thereby, the space between the inner peripheral surface of the mounting hole 3g and the outer peripheral surface of the pipe T is sealed in a watertight and airtight manner. Two sealing members 7 and 9 are not necessarily provided, and only one of them may be provided as long as the sealing performance is sufficient. In that case, the partition member 8 is omitted, and the length of the mounting hole 3g is made short corresponding to one seal member.

The partition member 8 is for preventing the two seal members 7 and 9 from coming into direct contact, and is made of a metal different from the metal constituting the pipe T such as brass, for example, brass. Of course, you may comprise with the aluminum which is the same metal as the piping T. FIG. The outer diameter of the partition member 8 is set to be substantially the same as or slightly smaller than the inner diameter of the mounting hole 3g. Therefore, the partition member 8 is movable in the axial direction of the mounting hole 3g. Moreover, as shown in FIG. 1, when the pipe T is not inserted into the through hole 3b, the lengths of the seal members 7 and 9 and the partition member 8 in the axial direction of the through hole 3b are the length of the stopper 5 and the bottom portion. It is shorter than the distance between 4a. Accordingly, the inner seal member 7, the partition member 8, and the outer seal member 9 are movable in the axial direction of the through hole 3b, although they are a small distance. However, as shown in FIG. 2, in a state where the pipe T is inserted into the through hole 3b, the seal members 7 and 9 are crushed in the radial direction and the cross-sectional shape thereof becomes an oval shape long in the axial direction. . As a result, the left end portion of the seal member 7 hits the stopper 5, and the right end portion of the seal member 9 hits the bottom portion 4a. Further, adjacent end portions of the seal members 7 and 9 abut each other via the partition member 8. Therefore, in a state where the pipe T is inserted into the through hole 3b, the inner seal member 7, the partition member 8, and the outer seal member 9 do not move in the axial direction of the through hole 3b.

  In the joint 1 having the above-described configuration, when the pipe T is connected to the main body 3, the pipe T is inserted into the through hole 3b through the insertion hole 4b. The tip of the pipe T abuts against the biting teeth 6 b of the engaging member 6 when passing through the seal members 7, 9, the partition member 8 and the stopper 5. As a result of each biting tooth 6b being pushed leftward by the pipe T, the engagement member 6 moves by a minute amount in the radial direction, and the axis of the engagement member 6 coincides with the axis of the pipe T. Therefore, the pipe T can easily pass through the engaging member 6. The pipe T is inserted into the through hole 3b until it abuts against the positioning protrusion 3c. Thereafter, the pipe T is moved to the right. Then, the biting teeth 6 b bite into the outer peripheral portion of the pipe T, and the engaging member 6 hits the stopper 5. That is, the annular plate portion 6a hits the left end surface of the stopper 5, and the biting tooth 6b hits the support protruding portion 5a. As a result, the pipe T is prevented from being detached from the through hole 3b, and is connected to the main body 3 in a retaining state.

  Thus, when connecting the pipe T using the joint 1, after inserting the pipe T into the through hole 3b, it is only necessary to move it slightly backward. There is no need to rotate and tighten the nut. Therefore, the pipe T can be connected easily and in a short time.

  In the joint 1 having the above configuration, the retaining member 4 is made of aluminum which is the same as the metal constituting the pipe T, so that the pipe T can be prevented from corroding. That is, if the retaining member 4 is made of a metal different from aluminum, for example, brass, rainwater enters between the inner peripheral surface of the insertion hole 4b of the retaining member 4 and the outer peripheral surface of the pipe T. A current flows between the pipe T and the retaining member 4 due to the electromotive force generated between different metals. As a result, the pipe T may be corroded. In that respect, according to this joint 1, since the retaining member 4 is made of aluminum which is a metal constituting the pipe T, no current flows between them. Therefore, corrosion of the pipe T can be prevented.

Further, in the joint 1, the main body 3 and the retaining member 4 are formed separately and screwed and fixed. For this reason, if the main body 3 and the retaining member 4 are made of different metals, when rainwater enters the screwed portion, current flows between them, and the main body 3 and the retaining member 4 Either one may corrode. However, in this joint 1, the main body 3 and the retaining member 4 are made of aluminum which is the same metal. Therefore, no current flows between them. Therefore, it can prevent that the main-body part 3 and the retaining member 4 corrode.

  Furthermore, since the seal members 7 and 9 are arranged behind the engaging member 6 in the insertion direction of the pipe T, the gap between the inner peripheral surface of the insertion hole 4b and the outer peripheral surface of the pipe T is within the mounting hole 3g. Even if rainwater enters, the rainwater does not reach the engaging member 6. Therefore, the engaging member 6 is made of a metal different from that of the main body 3 but does not rust or corrode.

  Next, another embodiment of the refrigerant pipe joint according to the present invention will be described. In the embodiment described below, only the configuration different from that of the above embodiment will be described, and the same parts as those of the above embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

  FIG. 8 shows a second embodiment of the present invention. In the joint 1 </ b> A of this embodiment, the retaining member 4 is retained from the main body 3 by the stop ring 10. Therefore, in this joint 1A, the male screw part 3a for fixing the retaining member 4 to the main body part 3 is not formed. The stop ring 10 is preferably made of aluminum.

  FIG. 9 shows a third embodiment of the present invention. The joint 1 </ b> B of this embodiment is a modification of the joint 1 </ b> A, and the position of the stopper 5 is fixed by the stop ring 11 without being screwed to the main body 3. Therefore, in this embodiment, the screw hole portion 3f is not formed, and the mounting hole portion 3g extends to the step surface 3h. In this embodiment, the retaining member 4 may be screwed and fixed to the main body 3.

  FIG. 10 shows a fourth embodiment of the present invention. In the joint 1C of this embodiment, a screw hole 3i is formed at the end of the mounting hole 3g on the opening side. Further, a retaining member 4 </ b> A is used instead of the retaining member 4. The retaining member 4A is formed in a ring shape, and its outer peripheral portion is screwed and fixed to the screw hole portion 3i. Therefore, in this embodiment, the male screw portion 3a is not formed. The retaining member 4A may be retained by a stop ring without being screwed to the inner peripheral surface of the mounting hole 3g. In such a case, the screw hole 3i is not necessary.

In addition, this invention is not limited to said embodiment, A various modification is employable in the range which does not deviate from the summary.
For example, in the above embodiment, the pipe T is connected to both ends, but the pipe T is connected only to one end, and the other end is a device such as an outdoor unit or an indoor unit. May be configured to be connected.
The through-hole 3b extends on the axis of the main body 3 from one end surface to the other end surface. The through-hole 3b is bent at an intermediate portion in the longitudinal direction, and either one end of the through-hole 3b May be opened on the outer peripheral surface of the main body 3.
Furthermore, in the above embodiment, the entire main body 3 and the entire retaining member 4 are made of aluminum. However, the retaining member 4 may come into contact with the pipe T via rainwater or the like. Only the annular part surrounding the insertion hole 4b may be made of aluminum, and the other part may be made of another metal. In that case, it is desirable to provide an insulating layer between a portion made of aluminum and a portion made of another metal. Moreover, when the main-body part 3 does not contact the part comprised with aluminum of the retaining member 4, you may comprise the main-body part 3 whole with metals other than aluminum.

T Piping 1 Joint for refrigerant piping 1A Joint for refrigerant piping 1B Joint for refrigerant piping 1C Joint for refrigerant piping 2 Joint body 3 Body portion 3b Through hole (passage hole)
3g Mounting hole 4 Retaining member 4A Retaining member 4b Insertion hole (passage hole)
6 Engagement member 7 Inner seal member (seal member)
9 Outer seal member (seal member)

Claims (3)

A passage hole through which a refrigerant flows is formed, a joint body into which a refrigerant pipe made of aluminum is inserted into the passage hole from one end opening thereof, and an inner periphery of the passage hole provided in the passage hole. In a joint for refrigerant piping comprising a sealing member that seals between the surface and the outer peripheral surface of the piping,
Of the joint body, at least a portion constituting an inner peripheral surface of the passage hole located rearward of the seal member in the insertion direction of the pipe into the passage hole is made of aluminum. Fitting for piping. The joint main body is provided with a mounting hole portion that constitutes a part of the passage hole at one end portion, a main body portion provided with the seal member in the mounting hole portion, and attached to one end portion of the main body portion. A retaining member, and the retaining member is provided with an insertion hole constituting the opening of the connection hole coaxially with the mounting hole, and the inner diameter of the insertion hole is the seal of the mounting hole. The joint for refrigerant piping according to claim 1, wherein the diameter is smaller than an inner diameter of a portion where the member is provided, and the retaining member and the main body are made of aluminum. An engagement member that prevents the pipe from coming out of the passage hole by engaging with the pipe inserted into the passage hole is provided inside the passage hole, and the seal member is provided with the pipe. The refrigerant pipe joint according to claim 1, wherein the refrigerant pipe joint is disposed rearward of the engagement member in the insertion direction into the passage hole.

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