JPH10339394A - Pipe connection device for compressor and piping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a pipe and a hose through the pipe to a compressor surely and by reducing a cost. SOLUTION: In a first pipe 30, an insertion tip end part 31 inserted in a pipe mounting hole 11 successively in one end side, annular swollen part 32 extended outward in a diametric direction, and non-circular part 34 having a pair of mutually opposed parallel wall parts behind this swollen part, are mechanically formed integrally with a tube. The first pipe 30 is slid in the notched part by inserting the non-circular part 34 to a notched part 25 of a mounting plate 20, to be mounted in the mounting plate incapable or rotating and moving in an axial direction. In the first pipe 30, by mechanically forming the swollen part and non-circular part 34 integrally with the tube, a cost is reduced as compared with that using a forging material in the part, and necessity for also cutting work for surface finish is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device for a compressor, in which an inlet and an outlet pipe are connected to and fixed to a pipe mounting hole of a compressor body by a mounting plate.

[0002]

2. Description of the Related Art Conventionally, as this type of compressor hose connection device, for example, the one shown in FIG. 8 is known. When the inlet pipe 2 and the outlet pipe 3 are mounted in the pipe mounting holes 1a and 1b of the compressor 1, the hose connecting device for a compressor is formed, for example, in a through hole 4a provided at one end of a long plate-shaped mounting plate 4. The inlet pipe 2 is welded and fixed, and the outlet pipe 3 is inserted into the notch 4 c at the other end of the mounting plate 4. Then, a mounting cylinder portion 4b and an outlet pipe 3 provided perpendicularly to a plane of the mounting plate 4 on the compressor 1 side are connected to the pipe mounting holes 1a,
1b, the bolt 5 is inserted into the mounting hole 4e of the mounting plate 4 and tightened.
Is fixed to the compressor 1.

As shown in FIG. 10, the mounting plate 4 has a notch 4c having a pair of parallel wall surfaces at one end having a mounting hole 4e side as a bottom 4c1 and opening at a side surface and a peripheral side surface on the compressor side and the opposite side. The width between the parallel wall surfaces is set at the outlet pipe 3
The thickness of the bulging portion 3d is substantially the same as the thickness between the insertion surfaces 3e. A flange-shaped engaging projection 4d is provided around the notch 4c on the side surface facing the mounting hole 1b, and can be engaged with the groove 3c of the outlet pipe 3. Therefore, the outlet pipe 3 is non-rotatably inserted into the notch 4c by the insertion surface 3e of the bulging portion 3d.
By engaging c with the engaging projection 4d at the end of the notch 4c, it is impossible to move in the axial direction.

As shown in FIGS. 9 (a) and 9 (b), the outlet pipe 3 is made of a thick cylindrical forging material, and one end of the outlet pipe 3 on the insertion side into the mounting hole 1b. In addition, an insertion tip 3a inserted into the mounting hole 1b, an annular bulge 3b formed at a rear portion thereof and extending radially outward, and a groove 3c formed at a predetermined interval behind the bulge 3b are sequentially provided. . Further, an annular bulge 3d having a smaller diameter than the bulge 3b is provided behind the groove 3c. The bulge 3d has a pair of crushed diametrically opposed positions which are tangentially parallel to each other. An insertion surface 3e is formed.

[0005]

By the way, in the above-mentioned conventional hose connecting device for a compressor, one end thereof is forged using a forged material to form the above-mentioned bulging portion 3b and a pair of insertion surfaces 3e. In order to be able to connect and fix the outlet pipe 3 to the pipe mounting hole 1b of the compressor body 1 in a liquid-tight manner, it is necessary to finish the insertion end 3a and the groove 3c by cutting. Therefore, there is a problem that the manufacturing cost is increased. The present invention is intended to solve the above-described problems, and provides a pipe connection device and a pipe device for a compressor that can surely and inexpensively connect a pipe and a hose to the compressor via the pipe. The purpose is to:

[0006]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the structural feature of the invention according to claim 1 is that an inlet and an outlet pipe are attached to a pipe mounting hole of a compressor body by a mounting plate. A compressor pipe connection device for connecting and fixing, wherein a center of a mounting plate has a mounting hole penetrating from a side on a compressor body side to an opposite side, and a compression hole is formed at one end of the mounting plate with the mounting hole side as a bottom. In the compressor piping connection device provided with a notch opening on the side of the fuselage and on the opposite side and the peripheral side, and having one of the pipes inserted into the notch, the inner peripheral surface of the notch of the mounting plate from the bottom. While having a pair of parallel wall surfaces facing each other extending toward the opening, one of the pipes,
An axially extending metal tube formed by a circular wall having a constant thickness, a first straight extending end formed at one axial end is mechanically formed integrally with the tube,
An annular bulge formed so as to protrude outward in the radial direction at a distance from the tip, and a pair of parallel wall portions that are recessed from each other and are radially opposed to each other behind the bulge. It is provided with a non-circular portion, and the non-circular portion inserted into the notch portion and the inner peripheral surface of the notch portion are relatively non-rotatably formed by the pair of parallel wall portions being engaged with the pair of parallel wall surfaces. is there.

According to the first aspect of the present invention, an inexpensive pipe such as a pull-out pipe and a continuous sewing tube can be used, and at least one of the parallel walls of the pipe has a notch in the mounting plate. The mounting plate is inserted into and engaged between a pair of parallel wall surfaces of the portion, the mounting plate is fixed to the compressor body using bolts inserted into the mounting holes, and one pipe is non-rotatably mounted to the cutout portion. The first end of one of the pipes has a bulged portion and a parallel wall portion formed at low cost by mechanical punching and pressing together with a metal tube formed by a circular wall having a constant thickness. I have.

As a result, according to the first aspect of the present invention, the above-mentioned one pipe is inexpensive as compared with a pipe using a conventional forged material, and is used for surface finishing such as a contact surface with a compressor body. Since cutting is not required, the manufacturing cost is significantly reduced. Further, since the first end of one of the pipes is mechanically formed integrally with the metal tube, a thin portion does not occur and the reliability of the pipe is secured. In addition, the conventional one is subject to equipment limitations that require a special equipment having a long working stroke in order to form a long forged material. Since a thin-walled tube that is drawn or continuously formed by sewing is used in order to employ the processing, there is no restriction on the length of the pipe.

According to a second aspect of the present invention, there is provided the compressor pipe connecting device according to the first aspect, wherein the pipe has a hose end inserted into the other end thereof. With a possible second end, the coupling means at the second end is formed integrally with the second end and the hose is securely fastened. With the configuration according to the second aspect of the invention as described above, the same effect as the first aspect of the invention can be obtained for the compressor piping connection device in which the hose is fixed to the second end of the pipe. .

A structural feature of the invention according to claim 3 is that the metal tube is formed of a metal tube extending in the axial direction, and the first straight end formed at one end in the axial direction is mechanically integrated with the tube. An annular bulge formed so as to protrude outward in the radial direction at a position distant from the distal end, and radially opposed to each other and formed to be recessed behind the bulge A non-circular portion having a pair of parallel wall portions.

In the invention according to claim 3 configured as described above, the bulging portion and the parallel wall portion of the piping device are formed integrally with the metal tube by mechanical punching and pressing. As a result, according to the invention of claim 3,
The piping device is manufactured more easily than the conventional forging method, and since the processed surface is good, cutting for surface finishing is not required, so that the manufacturing cost is significantly reduced. In addition, since the first end is mechanically formed integrally with the metal tube, a thin portion does not occur, and the reliability is ensured. In addition, according to the forging method, in order to form a long piping device, equipment having a long working stroke is limited, which is a limitation on equipment. To adopt the method,
There is no restriction on the length of the piping system.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment in which inlet and outlet pipes according to the embodiment are connected to pipe mounting holes of a compressor body by mounting plates. FIG. 2 is a partially broken cross-sectional view showing a connection portion of the compressor pipe connection device to be fixed to the compressor body.
The compressor body 10 is provided with pipe mounting holes 11 and 12 at inlets and outlets through which the refrigerant provided at the protrusion 10a flows in and out, and a screw hole 13 is formed at the protrusion 10a. A first pipe 30 made of a thin metal tube extending in the axial direction and formed of a circular wall having a constant thickness is connected to and fixed to the pipe mounting holes 11 and 12 by a mounting plate 20.

The mounting plate 20 is, as shown in FIGS.
It is formed in a substantially oval-shaped metal thick plate made of aluminum or the like, and has a center at a side from the side M on the compressor body 10 side to an opposite side N (thickness direction).
And a circular mounting hole 21 penetrating therethrough. Mounting plate 20
Is provided with a bulging portion 22 bulging into a disk shape including the periphery at one end of the side surface M across the mounting hole 21. At the center of the bulging portion 22 of the mounting plate 20, a flow hole 23 penetrating in the thickness direction is formed. Further, a cylindrical tubular portion 24 having a slightly smaller outer diameter than the bulged portion 22 is provided coaxially and integrally around the flow hole 23 on the bulged portion 22 side. An O-ring 2 is provided at a substantially intermediate position in the axial direction of the cylindrical portion 24.
7, a ring-shaped groove 24a is formed. As shown in FIG. 1, the flow hole 23 has a large-diameter portion 23a whose diameter from the opposite side surface N to a position near the thickness direction is coaxially enlarged. The mounting plate 20
One end of the second pipe 40 is inserted and fixed to the large diameter portion 23a by welding. A rubber hose (not shown) is fitted to the other end of the second pipe 40.

One end of the mounting plate 20 (the side opposite to the bulging portion 22)
The notch 25 which has the mounting hole 21 side as the bottom 25a and opens on the side surface M on the compressor body 10 side, the opposite side N and the peripheral side surface.
Is provided. The notch 25 is, as shown in FIG.
A pair of parallel wall surfaces 25b facing each other extending from the bottom 25a toward the opening are provided, and the inner wall of the bottom 25a is formed in an arc shape. The notch 25 has a step 25c at a substantially middle position in the thickness direction. The first portion 25d on the side surface M side and the opposite side surface N with the step 25c as a boundary.
Side second portion 25e. First part 25
d and the second portion 25e are coaxially arranged in a similar shape,
The first portion 25d has a slightly larger notch range.

A non-circular portion 34 of a first straight end 30a formed at one end of an axially extending tube (first pipe) 30, which will be described later, is inserted into the notch 25 of the mounting plate 20. And the mounting plate 20 so as to be relatively non-rotatable. The first end 30a is mechanically formed integrally with the tube (first pipe) 30 and is formed as shown in FIG.
As shown in FIG. 7, an annular bulging portion 32 formed to protrude outward in the radial direction at a position separated from an insertion distal end portion 31 inserted into the pipe mounting hole 11 from the distal end, and this bulging portion. A non-circular portion 34 having a pair of parallel wall portions 34a having the same thickness as the tube 30 which is recessed from each other at a small distance (intermediate portion 33) and is opposed to each other in the radial direction behind the portion 32 is provided.

The outer peripheral surface of the insertion tip portion 31 has a ring-shaped groove portion 31 in which an O-ring 35 is mounted at a substantially intermediate position in the axial direction.
a is integrally formed by rolling. Bulge 32
Is larger than the inner diameter of the pipe mounting hole 11 of the compressor body 10. The non-circular portion 34 includes a pair of parallel wall portions 3.
On both sides in the direction perpendicular to the axis of 4a, there are provided arcuate wall portions 34b bulging outward in an arc shape, and as shown in FIG. 7, the section perpendicular to the axis has a substantially elliptical shape. The first end portion 30a is formed by punching (press beading) a straightly extending tube formed of a circular wall of a constant thickness made of metal to form a bulged portion 32, and furthermore, a press 2 The non-circular portion 34 is formed by surface width processing. It should be noted that punching and press two-sided processing can be performed simultaneously.

A second pipe formed at the other end of the first pipe 30
As shown in FIG. 1, the end 30 b has an insertion end into which a hose can be inserted, and a sleeve fitting 51 is fixed to the outer periphery thereof. A rubber hose 50 is provided between the insertion end and the sleeve fitting 51. Hose 50 is fitted over the second end 3
0b, the second end 3 is fixed by the sleeve metal fitting 51.
The joint means at the second end portion is fixed by caulking with respect to Ob.

Next, the assembly of the pipe connection device to the compressor will be described. First end 3 of first pipe 30
The non-circular portion 34 of the mounting plate 20
By being inserted into the portion 25e, the parallel wall portion 34a of the non-circular portion 34 engages with the parallel wall surface 25b of the cutout portion 25, and the first pipe 30 is attached to the attachment plate 20 so as not to rotate relatively. . Further, both sides in the axial direction of the non-circular portion 34 of the first pipe 30 correspond to the second portions 25e of the cutout 25.
, The first end 30 a is immovable in the axial direction with respect to the mounting plate 20.

Next, the first O-ring 35 is inserted into the mounting plate 20 and the O-ring 35 is attached to the groove 31a of the insertion tip 31.
As shown in FIG. 1, the pipe 30 having the second pipe 40 fixed thereto and the O-ring 27 mounted on the cylindrical part 24 is connected to the pipe part 24 of the mounting plate 20 by the pipe mounting hole 12.
The first pipe 30 is slid in the longitudinal direction in the notch 25 to adjust the position, and the insertion tip 31 is inserted into the pipe mounting hole 11. Furthermore, the first pipe 30 and the tubular portion 24 are connected to the mounting holes 11 and 12 of the compressor body 10 in a liquid-tight manner by being screwed into the screw holes 13 through the mounting holes 21 through the bolts 26.

As described above, in the present embodiment, the first pipe 30 is attached to the mounting plate 20 so as not to rotate and cannot move in the axial direction. The insertion into the hole 11 can be easily performed while adjusting the position by sliding the inside of the notch 25 without worrying about the rotation and detachment of the pipe.

The first pipe 30 is inserted into the insertion end 3
Since the one groove portion 31a, the bulging portion 32 and the non-circular portion 34 are formed integrally with a metal tube formed by a circular wall having a constant thickness by mechanical punching and pressing, a conventional forged material is used. In addition, since it is inexpensive as compared with the one using, and cutting work for surface finishing such as the contact surface with the compressor body 10 is not required, the manufacturing cost is greatly reduced. Further, according to the present embodiment, since the first pipe 30 is formed by press working or the like, a thin portion does not occur in the pipe, and the reliability of the first pipe 30 is ensured.
Furthermore, the conventional one is subject to equipment limitations that require a special equipment with a long working stroke in order to form a long forged material. Since a thin tube formed of a circular wall is used, a thin tube that is long drawn or continuously formed can be adopted, and the length of the first pipe 30 is not limited.

In the above-described embodiment, the configuration of the pipe connection device in which the rubber hose 50 is connected to the first pipe 30 and the second pipe 40 has been described. Implementation in form is also possible.

In the above embodiment, the mounting plate 2
The second pipe 40 is welded to the side N opposite to the side 0, and the pipe part 24 is attached to the pipe part 12 with the cylindrical part 24 protruding from the side M of the mounting plate 20, but is not limited thereto.

[Brief description of the drawings]

FIG. 1 is a partially broken sectional view schematically showing a part of a hose connecting device for a compressor according to an embodiment of the present invention.

FIG. 2 is a front view schematically showing a mounting plate of the hose connection device.

FIG. 3 is a plan view schematically showing the mounting plate.

FIG. 4 is a side view schematically showing the mounting plate.

FIG. 5 is a front view schematically showing a first pipe of the hose connection device.

FIG. 6 is a plan view schematically showing the first pipe.

FIG. 7 is a sectional view of the first pipe taken along line VII-VII shown in FIG. 5;

FIG. 8 is a partially broken sectional view schematically showing a part of a conventional hose connection device for a compressor.

FIG. 9 is a front view schematically showing a first pipe of the hose connection device and a cross-sectional view taken along line IX-IX.

FIG. 10 is a plan view schematically showing a mounting plate of the hose connection device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Compressor body, 11, 12 ... Pipe mounting hole, 13 ... Screw hole, 20 ... Mounting plate, 21 ... Mounting hole, 22 ... Swelling part, 2
3 ... circulation hole, 24 ... cylinder, 25 ... notch, 25a ... bottom,
25b: parallel wall surface, 25c: step portion, 25d: first portion,
25e 2nd part, 26 ... bolt, 30 ... 1st pipe, 30a ... 1st end, 30b ... 2nd end, 31 ...
Insertion end portion, 32 bulge portion, 33 middle portion, 34 non-circular portion, 34a parallel wall portion, 34b arc wall portion, 40 second pipe, 50 hose, 51 metal sleeve.

Claims (3)

[Claims] 1. A compressor pipe connecting device for connecting an inlet pipe and an outlet pipe to a pipe mounting hole of a compressor body by a mounting plate and fixing the pipe, wherein a center of the mounting plate is arranged from a side on the compressor body side to an opposite side. One end of the mounting plate has a notch portion at one end of the mounting plate, the opening being on the side of the mounting hole side and the side surface and the peripheral side surface on the side opposite to the compressor body side and the peripheral side surface, and one pipe inserted into the notch portion In the piping connection device for a compressor, the notch inner peripheral surface of the mounting plate includes a pair of parallel wall surfaces facing each other extending from the bottom toward the opening, while the one pipe has a constant thickness. An axially extending metal tube formed by a circular wall of the above, a first straight extending end formed at one axial end is mechanically formed integrally with the tube, and is spaced apart from this tip. Radial position An annular bulge formed so as to protrude toward the front, and a non-circular portion having a pair of parallel walls that are recessed from each other and are radially opposed to each other behind the bulge, and inserted into the notch. The non-circular portion and the inner peripheral surface of the notch portion are relatively non-rotatably formed by engaging the pair of parallel wall portions with the pair of parallel wall surfaces. Connection device. 2. The pipe connecting device for a compressor according to claim 1, wherein the pipe has a second end at a second end thereof, into which a hose end of a flexible hose can be inserted. Coupling means at one end are formed integrally with said second end;
A pipe connection device for a compressor, wherein the hose is securely fixed. 3. A metal tube extending in an axial direction,
An annular first end formed at one axial end is mechanically formed integrally with the tube, and is formed to project radially outward at a distance from the tip. And a non-circular portion having a pair of radially opposed parallel walls formed to be recessed from each other behind the bulged portion.