JP7170243B2 - Piping connection structure and connection member - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pipe connection structure for connecting, via a connection member, a first pipe and a second pipe, which are axially spaced apart from each other and opposed to each other in a through hole of a wall, and a connection member used therein. .

For example, an inverter for an automobile incorporates an internal pipe through which a cooling medium flows inside the inverter case, and the internal pipe has an external pipe connected to, for example, a converter through a through hole provided in the wall of the inverter case. Connected. The following patent document 1 is mentioned as a thing regarding the connection member which connects such internal piping and external piping.
Patent Literature 1 below discloses a pipe connection structure using a connection member having two grip portions attached to each of two pipes and a connecting portion that connects the two grip portions. .

JP 2015-227701 A

By the way, when assembling the connection member to the pipe as described above, the first holding portion is designed to be firmly fitted onto the connection end of the pipe in order to ensure sealing performance. It has a structure that is difficult to insert to the extent that there are cases where an auxiliary agent is applied to improve the insertion. However, if the structure is easy to insert, it becomes difficult to ensure the sealing performance, and if the assembly is not performed securely, air remains in the assembly area, and the air tends to escape the connecting member that expands at high temperatures. Power acts and becomes a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe connection structure and a connection member used therein, which are capable of improving assembly while maintaining sealing performance.

In order to achieve the above object, a pipe connection structure according to the present invention is a pipe connection structure for connecting a first pipe and a second pipe, which are arranged opposite to each other while being spaced apart in the axial direction, via a connection member. The connection member is made of an elastic body, and has a first holding portion having a lip portion that is fitted onto the connection end portion of the first pipe and seals the first pipe, and a connection end portion of the second pipe. A cylindrical body having a second holding portion fitted on the outside and a connecting portion connecting the first holding portion and the second holding portion, and the outer peripheral surface of the connection end portion of the first pipe is provided with , an annular recess having an inner wall that forms part of the outer peripheral surface, an outer wall that faces the inner wall, a bottom, and an opening, and is fitted to the inner wall and the outer wall. The first holding portion is provided, and a slit portion is formed along the outer wall so as to extend from the bottom portion to the opening portion, and the slit portion is compressed and deformed by fitting the first holding portion. is also characterized by having a gap that can secure an air passage .
Another pipe connection structure according to the present invention is a pipe connection structure for connecting a first pipe and a second pipe, which are arranged to face each other while being spaced apart in the axial direction, via a connection member, wherein the connection The members include a first holding part having a lip part that is fitted onto the connection end of the first pipe and that seals the first pipe, and a second holding part that is fitted onto the connection end of the second pipe. , a tubular body including a connecting portion that connects the first holding portion and the second holding portion, and the outer peripheral surface of the connection end portion of the first pipe constitutes a part of the outer peripheral surface an annular recess having an inner wall, an outer wall provided opposite to the inner wall, a bottom, and an opening, and the first holding portion is provided so as to fit the inner wall and the outer wall, A slit portion is formed along the outer wall so as to extend from the bottom portion to the opening portion. It is characterized by being a flat portion that abuts on.
Further, in the connection member used in the pipe connection structure according to the present invention, the first holding portion attached to the connection end portion of the first pipe and the second holding portion attached to the connection end portion of the second pipe and a connecting portion that connects the first holding portion and the second holding portion.

The pipe connection structure according to the present invention and the connection member used therefor are configured as described above, so that it is possible to improve the assembling property while maintaining the sealing property.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which showed typically the principal part which shows one Embodiment of the piping connection structure which concerns on this invention, and the connection member used for this. It is a figure for demonstrating the 1st piping and connecting member which concern on the same embodiment, and is sectional drawing which shows typically the state before assembling|attaching a connecting member to the same 1st piping. (a) is a front view schematically showing the connection end of the first pipe according to the embodiment, and (b) is a partially enlarged perspective view schematically showing the connection end of the first pipe. is. 4(a) to 4(d) are partially enlarged front views schematically showing variations of the slit portion of the groove provided at the connecting end portion of the first pipe according to the same embodiment. FIG.

An embodiment of the present invention will be described below with reference to the drawings. It should be noted that some of the detailed reference numerals attached to other drawings are omitted in some of the drawings.

In the pipe connection structure according to the present embodiment, a first pipe 1 and a second pipe 2, which are arranged in a through hole 10 of a wall 101 and are spaced apart in the axial direction, are connected via a connection member 3. It is a piping connection structure. The connecting member 3 includes a first holding portion 30 having an inner peripheral lip portion 32 fitted on the connecting end portion 1a of the first pipe 1 and sealing the first pipe 1, and an outer connecting end portion 2a of the second pipe 2. It is a cylindrical body having a second holding portion 40 to be fitted and a connecting portion 50 connecting the first holding portion 30 and the second holding portion 40 . The outer peripheral surface 1aa of the connection end portion 1a of the first pipe 1 includes an inner wall 11a forming part of the outer peripheral surface 1aa, an outer wall 11b provided facing the inner wall 11a, a bottom portion 11c, and an opening portion 11d. is provided, a first holding portion 30 is provided so as to fit the inner wall 11a and the outer wall 11b, and a slit portion 13 is formed along the outer wall 11b from the bottom portion 11c to the opening portion 11d. formed.

The pipe connection structure of the present embodiment can be applied as a structure for connecting a cooling pipe of a cooler that cools electronic equipment for automobiles with a refrigerant and an external hose, for example. In this case, it is required not only to prevent leakage of the refrigerant, but also to withstand the infiltration of rainwater from the outside, the injection of water during high-pressure washing of the vehicle, etc., and the sealing performance that can be maintained even if the pipe is eccentric. In addition to having such a sealing property, it is also required to improve the assembling property as described above. Below, the piping connection structure which connects the 2nd piping 2 arrange|positioned inside the inverter case 100 for motor vehicles, and the 1st piping 1 arrange|positioned outside the inverter case 100 by the connection member 3 is demonstrated.

In the case of an automobile having an electric motor as a drive source, the operation of the electric motor is controlled by an inverter. An electric motor obtains power from a battery and functions as a motor or the like that generates driving force, and an inverter converts DC power supplied from a battery or the like into AC power by a switching action to supply power to the electric motor. Inverters used in such automobiles require a large amount of electric power, and a large amount of heat is generated because a large amount of current flows through switching elements and the like. Therefore, a system is employed that cools the inverter by configuring a refrigerant flow path through which a refrigerant such as cooling water or a cooling liquid flows in the inverter case 100 that accommodates the inverter.

<Piping connection structure>
The inverter case 100 is a substantially rectangular parallelepiped box that is divided into upper and lower parts, and includes an upper case and a lower case shown as a wall 101 in FIG. 1 . The inverter case 100 is configured by joining a lower case, which is generally concave when viewed in cross section, over a lower case, which is generally concave when viewed in cross section, so as to cover the upper case, which is generally concave when viewed in cross section. It is said that Inverter case 100 is made of a metal material such as aluminum. The (cooling pipe) is arranged so as to constitute a part of the coolant channel. Side walls of the upper case and the lower case are formed with semi-circular notch holes at positions facing each other so that a through hole 10 is formed when the two are joined together to form an inverter case 100 . As shown in FIG. 1, the second pipe 2 is arranged so that the tip side of the connecting end portion 2a thereof is located in the through hole 10, so that the inverter case 100 is connected to the inverter case 100 through the through hole 10 from the outside of the inverter case 100. When looking into the inside, the tip side of the connection end portion 2a of the second pipe 2 can be visually recognized. The shape of the through hole 10 is not particularly limited, and is formed according to the shape and size of the first pipe 1 (external hose) connected to the second pipe 2 . The diameter of the through hole 10 is formed to be larger than the outer diameter of the first pipe 1 through which it is inserted.
Here, the second pipe 2 is described as constituting a part of the refrigerant flow path, but it is not limited to this, and may communicate with a separately provided refrigerant flow path. In the figure, L indicates the axis of the through hole 10 provided in the inverter case 100, L1 is the axis of the first pipe 1, L2 is the axis of the second pipe 2, and L3 is the axis of the connecting member 3. indicates Therefore, the state in which the axis L and the axes L1 to L3 are aligned as shown in FIG. 1 is desirable as a connection state, but the connection structure of the present embodiment assumes that these axes L to L3 are eccentric. is.

<Connection member>
The connection member 3 is a member for connecting the first pipe 1 and the second pipe 2 to form a refrigerant flow path, and is entirely made of rubber material such as ethylene propylene rubber, butyl rubber, silicone rubber, elastomer, synthetic resin. It is made into a cylindrical molded body by an elastic body made of, for example. As shown in FIG. 2 , the connection member 3 has a first holding portion 30 , a second holding portion 40 and a connecting portion 50 . The first holding portion 30 is externally fitted so as to cover the connecting end portion 1a of the first pipe 1 and internally fitted to the inner peripheral surface 10a of the through hole 10 . The second holding portion 40 is externally fitted so as to cover the connecting end portion 2 a of the second pipe 2 . The connecting portion 50 is a member that connects the first holding portion 30 and the second holding portion 40. Since the connecting portion 50 itself has elasticity, the first pipe 1 and the second pipe 2 are eccentrically arranged. can also be displaced in the radial direction.
The outer diameter of the first pipe 1 is made slightly larger than the outer diameter of the second pipe 2 , and accordingly the inner diameter of the first holding portion 30 is made larger than the inner diameter of the second holding portion 40 . Therefore, the connecting portion 50 that connects the first holding portion 30 and the second holding portion 40 has a tapered shape whose diameter gradually decreases from the first holding portion 30 toward the second holding portion 40 .

<First piping, second piping>
The first pipe 1 is made of a hollow cylindrical body such as a resin material, and is configured to feed the coolant to the second pipe 2 that serves as a coolant flow path inside the inverter case 100 . The second pipe 2 is made of a hollow cylindrical body such as a resin material, and the refrigerant supplied from the first pipe 1 flows through the inside.
The connecting end portion 1a of the first pipe 1 is provided with an annular recess 11 and an annular collar portion 12 formed on the outer periphery of the recess 11 so as to protrude radially outward. As shown in FIGS. 1 and 2, the recess 11 has an inner wall 11a, an outer wall 11b provided opposite to the inner wall 11a, a bottom 11c, and an opening 11d, and is fitted to the inner wall 11a and the outer wall 11b. A first holding portion 30 is provided as follows. A slit portion 13 is formed along the outer wall 11b from the bottom portion 11c to the opening portion 11d.
1 shows a state in which the first holding portion 30 of the connecting member 3 is fitted in the recess 11, and the first pipe 1 and the second pipe 2 are connected by the connecting member 3 through the through hole 10. , and FIG. 2 shows the state before the connection member 3 is assembled to the first pipe 1. As shown in FIG.

The slit portion 13 formed in the outer wall 11b of the recess portion 11 is formed along the axial direction (L1 direction) as a strip-like groove so as to serve as an air passage. Since the slit portion 13 is formed along the outer wall 11b from the bottom portion 11c to the opening portion 11d in this way, when the first holding portion 30 of the connection member 3 is assembled to the first pipe 1, the slit portion Air escapes from 13 and is easy to insert. Therefore, the end portion 35 of the first holding portion 30 can be reliably inserted to the bottom portion 11c of the concave portion 11, and the assembling property can be improved. In addition, since the assembly can be performed reliably in this manner, no air remains in the recess 11, and the force acting to escape due to residual air or air expansion at high temperatures can be prevented.
The slit portion 13 will be described in more detail later with reference to the drawings.

The flange 12 has a diameter larger than that of the through hole 10 so as to abut on the wall 101 in a state where the first pipe 1 and the second pipe 2 are connected by the connecting member 3. , through holes 12a and 12b through which fasteners such as screws are inserted are formed. Fixing tools (not shown) are inserted into the insertion holes 12a and 12b formed in the flange 12, and the flange 12 is fixed to the outer surface of the wall 101, whereby the first pipe 1, which is an external pipe, is attached to the wall. Fixed at 101.
On the other hand, the front side of the connection end portion 2a of the second pipe 2 is provided with a front side portion 2ab having a diameter slightly smaller than that of the other parts so that the connection member 3 can be easily attached and detached.
The shape, formation position, and the like of the insertion holes 12a and 12b formed in the flange portion 12 are not limited to those shown in the drawings.

<First holding part>
The first holding portion 30 has an inner peripheral lip portion 32 , an inner peripheral projection portion 33 , an outer peripheral lip portion 31 , a flat portion 34 and an end portion 35 . The inner peripheral lip portion 32 is an annular lip that is continuous in the circumferential direction and elastically contacts the outer peripheral surface 1aa of the first pipe 1, and is fitted into the recessed portion 11 in an elastically deformed state. The inner peripheral protrusion 33 is provided adjacent to the inner peripheral lip portion 32 . The outer peripheral lip portion 31 is an annular lip that is continuous in the circumferential direction, and elastically contacts the inner peripheral surface 10a of the through hole 10 with interference due to bending deformation. The flat portion 34 is formed flat so as to abut along the outer wall 11 b of the recess 11 . The end portion 35 is formed flat so as to come into contact along the bottom portion 11c of the recess 11. As shown in FIG.

As shown in FIG. 2, the amount of protrusion of the outer peripheral lip portion 31 is larger than the amount of protrusion of the inner peripheral lip portion 32 . A plurality of inner peripheral lip portions 32 are provided side by side, and an inner peripheral side region where the plurality of inner peripheral lip portions 32, 32 are arranged is referred to as an inner seal region S1. A region on the outer peripheral side where the outer peripheral lip portion 31 is arranged is called an outer seal region S2. The inner seal region S1 and the outer seal region S2 are provided at positions that do not overlap in the radial direction. is embedded in

The inner peripheral protrusion 33 is provided adjacent to the inner peripheral lip portions 32, 32 provided in the inner seal region S1, and is formed on the inner peripheral surface 30a corresponding to the position where the outer peripheral lip portion 31 is formed. . As shown in FIG. 1, the inner peripheral lip portion 32 is formed to have a length sufficient to elastically deform and fall down, and the elastic contact portion that elastically contacts the inner wall 11a is formed in a tapered cross-sectional mountain shape.

The outer peripheral surface 30b of the first holding portion 30 is provided with an outer peripheral lip portion 31 that contacts the inner peripheral surface 10a of the through hole 10 in an elastically deformed state. As shown in FIG. 2, the outer peripheral lip portion 31 has a linear surface 31A opposite to the insertion direction of the first pipe 1, and the other surface 31B gradually tapers toward the tip. It has a sloping shape. A base portion of the outer peripheral lip portion 31 on one surface 31A has a bent portion 31b that serves as a bending point of the outer peripheral lip portion 31 when elastically contacting the inner peripheral surface 10a of the through-hole 10 . The bent portion 31b is an intersection point between the one surface 31A and the inclined portion 31a which is inclined from the outer peripheral surface 30b to the one surface 31A. 1, the outer peripheral lip portion 31 is deformed into a collapsed state and elastically contacts the inner peripheral surface 10a of the through hole 10. As shown in FIG.

<Slit part>
The slit portion 13 formed in the concave portion 11 into which the first holding portion 30 is fitted will be further described with reference to FIGS. 3 and 4. FIG.
A plurality of slits 13 shown in FIGS. 3(a) and 3(b) are formed along the outer wall 11b at appropriate intervals along the outer wall 11b so as to extend from the bottom 11c of the recess 11 to the opening 11d. . The slit portion 13 is formed in a semicircular concave shape when viewed from the front. Although an example in which a plurality of slit portions 13 are provided is shown here, only one slit portion 13 may be provided. The slit portion 13 may be formed somewhere between a surface without a lip that elastically contacts with an interference like the inner seal region S1 of the first holding portion 30 and a surface that elastically contacts.
Assuming that the slit portion 13 is formed along the outer wall 11b from the bottom portion 11c of the recess 11 to the opening portion 11d in this way, the air is released from the slit portion 13 when the first holding portion 30 is fitted. It is easy to remove and insert the first holding portion 30 of the connecting member 3 into the outer peripheral surface 1aa of the first pipe 1 (also corresponding to the inner wall 11a of the recess 11).

The shape of the slit portion 13 is not limited to FIGS. 3(a) and 3(b), and even if the first holding portion 30 is compressed and deformed by fitting as shown in FIGS. It suffices if it is formed so as to have a gap that can secure the air passage D. In the drawing, the chain double-dashed line indicates the first holding portion 30 elastically contacting the outer wall 11b. It goes without saying that the examples of FIGS. 3(a) and 3(b) also have a gap capable of securing an air passage even if the first holding portion 30 is compressed and deformed by fitting.
FIG. 4A shows an example in which the slit portion 13 is formed in a V-shaped concave shape when viewed from the front.
FIG. 4(b) shows an example in which the slit portion 13 is formed in a substantially trapezoidal concave shape when viewed from the front, and the dimension on the side of the groove bottom 13a is smaller than the dimension on the side of the opening 13b.
FIG. 4(c) shows an example in which the slit portion 13 is formed in a substantially rectangular recessed shape when viewed from the front, and the dimension on the side of the groove bottom 13a and the dimension on the side of the opening 13b are substantially the same.
FIG. 4D shows an example in which the slit portion 13 has a substantially semicircular protrusion 13c formed substantially in the center of a substantially rectangular recess 13d in a front view. The protrusion 13c may be formed continuously along the depth direction (axial direction L1) of the outer wall 11b, or may be formed intermittently.
As shown in FIGS. 4(a) to 4(d), the shape of the slit portion 13 is formed so as to have a gap that can secure the air passage D even if the first holding portion 30 is compressed and deformed by fitting. is not particularly limited. If the air passage D is secured even after the first holding portion 30 is assembled in the recess 11 in this way, not only is the insertability improved as described above, but also the connection member 3 can be connected to the first pipe 1 , for example. Even if an insertion aid is applied so as to facilitate insertion when inserting into and assembling, the air passage D is formed, so that it can be dried after assembling.

<Joint part>
The connecting portion 50 connects the first holding portion 30 attached to the connecting end portion 1a of the first pipe 1 and the second holding portion 40 attached to the connecting end portion 2a of the second pipe 2, and is elastically deformable. It is said that Since the diameters of the first holding portion 30 and the second holding portion 40 are different from each other according to the diameters of the first pipe 1 and the second pipe 2, the connecting portion 50 is tapered.

The connecting portion 50 is provided with an outer peripheral protrusion 51 that is adjacent to the insertion direction side of the outer peripheral lip portion 31 (the side of the second holding portion 40) and has a mountain-shaped cross section and is in elastic contact with the inner peripheral surface 10a of the through hole 10. ing. The outer peripheral protrusions 51 may be formed continuously along the circumferential direction, or may be formed at appropriate intervals. The outer peripheral protrusion 51 is formed in a mountain-shaped cross section with a protrusion amount smaller than that of the outer peripheral lip portion 31 .

<Second holding part>
The inner peripheral surface 40a of the second holding portion 40 has a lip forming region A (see FIG. 2) provided with an annular lip portion 42 that abuts against the outer peripheral surface 2aa of the second pipe 2 . An annular recessed portion 41 having a bottom portion 41b and a pair of groove wall portions 41a, 41a is provided on the outer peripheral surface 40b of the second holding portion 40 corresponding to the lip forming area A formed on the inner peripheral surface 40a. It is The grooved portion 41 is annularly formed along the circumferential direction, and the grooved portion 41 accommodates a reinforcing ring 4 that reinforces the fitting to the second pipe 2 in a fitted state. The reinforcing ring 4 is an annular body made of a metal material, a synthetic resin material, or the like, and is formed in accordance with the dimensions of the groove depth and groove width of the groove portion 41 . A reinforcing ring 4 is arranged on the outer peripheral surface 40b of the second holding portion 40 corresponding to the lip forming area A. As shown in FIG.

A projecting portion 43 is formed adjacent to the lip portion 42 on the other end 3 b side of the connecting member 3 . The protruding portion 43 is formed continuously along the circumferential direction, and the top portion thereof is formed in a mountain-shaped cross-section inclined in the opposite direction to the insertion direction so that the connecting member 3 can be easily inserted into the second pipe 2. It is The projecting portion 43 is formed so as to be in elastic contact with the outer peripheral surface 2aa of the second pipe 2 . The protrusion amount of the projection 43 and the distance between the adjacent lip portion 42 are such that even when the projection 43 is fitted to the outer peripheral surface 2aa of the second pipe 2 and the top portion is slightly elastically deformed and falls toward the lip portion 42 side, It is desirable that the protrusions 43 are formed with an amount of protrusion that does not come into contact with the lip portion 42 and are spaced apart from each other.

A bottom portion 41b of the grooved portion 41 provided in the second holding portion 40 includes a contact portion 41ba that contacts the inner peripheral surface 4a of the reinforcing ring 4 and a recess that does not contact the inner peripheral surface 4a of the reinforcing ring 4. and a portion 41c. The abutting portion 41ba is formed at a position corresponding to the base portion 42a on the side of the connecting portion 50 of the lip portion 42 (on the side of the one end 3a of the connecting member 3), and the recessed portion 41c is formed on the side opposite to the connecting portion of the lip portion 42 (on the side of the connection portion 3a). It is formed at a position corresponding to the base portion 42b on the other end 3b side of the member 3).

Each of the plurality of lip portions 42 has a mountain-shaped cross-section of the same size, and is annularly formed along the circumferential direction. The contact portion 41ba is formed including a position corresponding to the top portion 42c of the lip portion 42 and a position corresponding to the base portion 42a of the lip portion 42 on the connecting portion 50 side.

Further, the recessed portion 41c is formed at a position corresponding to a portion where the lip portion 42 is not formed. Specifically, in the example shown in FIGS. 1 and 2, a total of three recessed portions 41c are formed, and the recessed portion 41c provided closest to the connecting portion 50 is arranged on the connecting portion 50 side. It is formed from a position corresponding to the top portion 42c of the lip portion 42 to a position corresponding to the base portion 42a of the adjacent lip portion 42 on the connecting portion 50 side. In addition, the recessed portion 41c formed second from the connecting portion 50 side also extends from the position corresponding to the top portion 42c of the lip portion 42 arranged on the connecting portion 50 side to the base portion of the adjacent lip portion 42 on the connecting portion 50 side. It is formed up to a position corresponding to 42a. The recessed portion 41c provided on the most opposite side of the connecting portion, that is, on the other end 3b is arranged on the most opposite side of the connecting portion from the position corresponding to the top portion 42c of the lip portion 42 disposed on the most opposite side of the connecting portion. It is formed from the position corresponding to the base portion 42b of the lip portion 42 to the other end 3b side.

The lip portions 42, 42, 42 provided on the second holding portion 40 are formed with a certain distance (interval) therebetween. The amount of protrusion of the lip portions 42, 42, 42 is made larger than the distance between the adjacent lip portions 42, 42. As shown in FIG. The lip portion 42 is configured to elastically contact the second pipe 2 with an interference, and the distance between the adjacent lip portions 42 , 42 is larger than the interference of the lip portion 42 .

Next, the procedure for connecting the first pipe 1 and the second pipe 2 at the through hole 10 using the connecting member 3 configured as described above will be described.
<Connection instructions>
First, the first holding portion 30 of the connection member 3 is fitted into the concave portion 11 of the first pipe 1 , and the connection member 3 is assembled to the first pipe 1 . At this time, since the slit portion 13 is formed in the outer wall 11b of the concave portion 11, the air is released from the slit portion 13 and the insertion is facilitated. Moreover, since the air is released from the slit portion 13, the end portion 35 of the first holding portion 30 can be reliably inserted to the bottom portion 11c of the recess portion 11. As shown in FIG.
At the time of this assembly, the inner peripheral lip portion 32 is elastically deformed so as to fall obliquely from the bottom portion 11c toward 11d.
Prior to this, the reinforcing ring 4 may be fitted into the grooved portion 41 of the second holding portion 40 and housed in the connecting member 3 in advance. At this time, since the recessed portion 41c is formed in the recessed portion 41 in which the reinforcing ring 4 is accommodated, the contact surface of the reinforcing ring 4 is reduced, the resistance due to friction is reduced, and the reinforcing ring 4 is easily assembled.

Then, the connection member 3 and then the first pipe 1 are inserted through the through-hole 10 of the wall 101 from the outside (see the white arrow direction in FIG. 1). The other end 3 b of the connecting member 3 reaches the connecting end 2 a of the second pipe 2 , and the top of the projecting portion 43 first elastically contacts the front side portion 2 ab of the second pipe 2 . Since the front side portion 2ab is inclined so as to have a smaller diameter than other portions of the second pipe 2 and gradually increase in diameter, the projection 43 inclined in the direction opposite to the insertion direction smoothly deforms elastically. do. Then, the lip portion 42 arranged on the other end 3b side is elastically contacted with the outer peripheral surface 2aa of the second pipe 2, elastically deformed while being compressed, and is obliquely inclined so as to cover the second pipe 2. be fitted.

Then, the connection member 3 is inserted toward the second pipe 2 until the flange 12 of the first pipe 1 contacts the wall 101 . Then, the outer peripheral lip portion 31 is in elastic contact with the inner peripheral surface 10 a of the through hole 10 . At this time, since the inner seal region S1 and the outer seal region S2 are provided at positions that do not overlap in the radial direction, it is possible to prevent an increase in the insertion load and improve the ease of assembly. Further, even if the axial center L1 of the first pipe 1 and the axial center L of the through hole 10 are misaligned and eccentric, the inner seal area S1 and the outer seal area S2 are provided at positions that do not overlap in the radial direction. The sealing performance can be maintained without being affected by surface pressure fluctuations and internal stresses in the inner and outer seal regions S1 and S2. Further, at this time, since the connecting portion 50 has elasticity and can be displaced in the radial direction, even if there is some misalignment between the axis L of the through hole 10 and the axis L2 of the second pipe 2, , is absorbed by the elastic deformation of the connecting portion 50 . In particular, since the joint portion 50 is tapered, the joint portion 50 itself is made of an elastic material, and the eccentric deviation can be effectively absorbed. Furthermore, since the outer peripheral lip portion 31 has a bent portion 31b, when it is elastically contacted with the inner peripheral surface 10a of the through hole 10, the outer peripheral lip portion 31 can be bent so as to be sharply bent with the bent portion 31b as a bending point. can. Thereby, the insertion load when inserting the first pipe 1 into the through hole 10 can be reduced, and the insertion performance can be improved.
Finally, a fixture (not shown) is inserted into the insertion holes 12a and 12b of the flange 12 of the first pipe 1 and fixed to the wall 101 by the fixture, thus completing the connection of the two pipes 1 and 2. do.

In the connected state by the connecting member 3, the outer fitting portion of the first holding portion 30 to the first pipe 1 and the outer fitting portion of the second holding portion 40 to the second pipe 2 are provided with an annular inner peripheral lip portion 32, Since the lip portion 42 is interposed in a compressed state, a connection structure with high sealing performance can be provided, and the refrigerant can flow between the first pipe 1 and the second pipe 2 via the connection member 3 . In addition, since the ring-shaped outer peripheral lip portion 31 is interposed between the first holding portion 30 and the through hole 10 in a compressed state, the inside and outside of the inverter case 100 through the through hole 10 are sealed, and the external force through the through hole 10 is sealed. Dust and the like can be prevented from entering the inverter case 100 .

Next, a drawing procedure for drawing out the first pipe 1 connected as described above will be described.
<Extraction procedure>
First, the fasteners that are inserted through the insertion holes 12a and 12b of the collar portion 12 of the first pipe 1 and fix the first pipe 1 to the wall 101 are removed, the collar portion 12 of the first pipe 1 and the like are grasped, and the second A force is applied in the direction of pulling away from the pipe 2, that is, in the pull-out direction. Then, the lip portion 42, the protrusion 43, and the outer peripheral lip portion 31 are reversed, and the apexes thereof are inclined in the insertion direction. At this time, since the recessed portion 41c is provided in the grooved portion 41, it is possible to reduce the surface pressure of the lip portion 42 that is generated when the lip portion 42 is pulled out. In addition, since the plurality of lip portions 42 are formed with a predetermined distance (interval), and the lip portions 42 are formed with a predetermined amount of protrusion, the adjacent lip portions 42, 42 do not stick to each other. , the lip reaction force does not increase. Therefore, it is possible to prevent the pull-out load from increasing.
Then, in the above-described state, if a force is applied in the pulling direction as it is, the connecting member 3 is separated from the second pipe 2, and the connecting member 3 can be smoothly pulled out from the second pipe 2 together with the first pipe 1. can be done.

Note that in the above-described embodiment, the pipe connection structure and the An example of application to the connection member 3 used for this has been described, but in the through hole of the wall, the first pipe and the second pipe arranged opposite to each other while being spaced apart in the axial direction are connected via the connection member. It is also applicable to other pipe connection structures as long as it is a pipe connection structure that does. The configuration of the connection member 3 is also an example, and is not limited to the illustrated example. The number and shape (projection amount, projection width, etc.) of the portions 51 are not limited to those shown in the drawings. Furthermore, although not shown, for example, the configuration of the contact portion 41ba and the recessed portion 41c provided in the second holding portion 40 is not limited to the illustrated example. , or may not match the number of lip portions 42 formed.

Reference Signs List 100 inverter case 101 wall 10 through hole 10a inner peripheral surface 1 first pipe 11 recess 13 slit portion 1aa outer peripheral surface 2 second pipe 3 connecting member 30 first holding portion 30b outer peripheral surface 31 outer peripheral lip portion 40 second holding portion 50 Connecting portion 51 Peripheral protrusion

Claims (4)

A pipe connection structure for connecting a first pipe and a second pipe, which are arranged to face each other while being spaced apart in the axial direction, via a connection member,
The connection member is made of an elastic body, and includes a first holding portion having a lip portion that is fitted onto the connection end of the first pipe and that seals the first pipe, and a connection end of the second pipe. a cylindrical body including a second holding portion and a connecting portion that connects the first holding portion and the second holding portion,
The outer peripheral surface of the connection end of the first pipe has an annular recess having an inner wall forming part of the outer peripheral surface, an outer wall provided opposite to the inner wall, a bottom, and an opening. provided,
The first holding portion is provided so as to fit the inner wall and the outer wall, and a slit portion is formed along the outer wall so as to reach the opening from the bottom portion ,
The pipe connection structure , wherein the slit portion has a gap capable of securing an air passage even if the first holding portion is compressed and deformed by fitting . A pipe connection structure for connecting a first pipe and a second pipe, which are arranged to face each other while being spaced apart in the axial direction, via a connection member,
The connection member includes a first holding part having a lip part that is fitted onto the connection end of the first pipe and that seals the first pipe, and a second holding part that is fitted onto the connection end of the second pipe. and a connecting portion that connects the first holding portion and the second holding portion, and
The outer peripheral surface of the connection end of the first pipe has an annular recess having an inner wall forming part of the outer peripheral surface, an outer wall provided opposite to the inner wall, a bottom, and an opening. provided,
The first holding portion is provided so as to fit the inner wall and the outer wall, and a slit portion is formed along the outer wall so as to reach the opening from the bottom portion,
The pipe connection structure , wherein the first holding portion is provided with a plurality of the lip portions on the inner peripheral surface thereof, and the outer peripheral surface thereof is a flat portion that abuts on the outer wall . In claim 1 ,
The pipe connection structure, wherein the first holding portion is provided with a plurality of the lip portions on the inner peripheral surface thereof, and the outer peripheral surface thereof is a flat portion that abuts on the outer wall. A connection member used in the pipe connection structure according to any one of claims 1 to 3,
A first holding part attached to the connection end of the first pipe, a second holding part attached to the connection end of the second pipe, and connecting the first holding part and the second holding part A connection member characterized by having a connecting portion.

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