JPS594597B2 - Dokan no Tameno Hikida Shiguchi Setsuteiyouben - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to hermetic refrigeration systems, and more particularly to a sump valve for attaching a drawer frame for maintenance service to a refrigerant conduit.

In order to maintain a refrigeration system in good working condition, it is essential that the system be periodically inspected and serviced, and if necessary refilled with refrigerant gas.

A conventional valve for providing an outlet in a refrigerant conduit for performing such maintenance services consists of a relatively short thin-walled steel pipe with a through-hole coaxially fixed to one end of the pipe. The other end of the steel pipe is formed into a forked shape, and holds a part of the circumferential surface of a copper conduit through which refrigerant gas is circulated, and is connected to the conduit by soldering or the like.

A cylindrical core member equipped with a valve for passing gas is housed in the inner hole of the housing so as to be slidable in the axial direction.

The core member has a conduit-instance tip.

The cap is screwed onto the end of the housing opposite to the side of the conduit to which the drawer frame is to be attached, and the conduit tip is drilled into the conduit by pressing the housing wall against the edge of the core member adjacent thereto and twisting it. At the same time, the end of the core member opposite to the side where the practical tip is located is pressed against the inner wall of the housing to seal it.

The maintenance service outlet setting valve described above works well if properly installed, but this device does not allow the cylindrical core member to close to the housing as the cap is progressively screwed into the housing. There is no means for indicating to the service personnel that the product has been sealed and crimped.

Accordingly, service personnel may over-thread the cap onto the housing and, therefore, force the working tip of the tubular core member into the conduit too much, denting or flattening the conduit.

As a result, the seal between the conduit and the conduit tip is incomplete and refrigerant gas leaks.

Furthermore, if the cap is tightened too deeply, it will come into contact with the stem of the air valve core, leaving the air valve partially open, resulting in refrigerant leakage.

The present invention forms a tapered outer surface tapered toward the conduit practical tip at the intermediate portion of the cylindrical core member, and the tapered surface sealingly engages with a seat on the inner hole wall surface of the housing. As a result, the above-mentioned disadvantages are overcome by arranging the core member to be prevented from sliding axially within the housing beyond a certain limit point.

1.2 and 3, a preferred embodiment of the device 10 of the present invention is shown comprising a housing 12 secured to a conduit connection member 14.

The conduit connection member 14 is attached to the conduit 16 to which the drawer frame is to be attached.

12 housings, inner hole 18, counterbore 19 and hexagonal head 2
1 and approximately cylindrical in shape.

An annular shoulder 20 is formed between the bore 18 and the end comb 19.

Two hexagonal heads formed between one end and the other end of the housing have a flat surface for retaining the shape of the wrench.

A thread 22 is cut into one end portion of the housing.

This end of the housing has a reduced diameter outer circumferential surface forming a relatively thin wall 24 outwardly from the thread 22.

The purpose of this thin wall will be discussed later.

The annular shoulder 20 is formed by the end surface of an oversized drill bit (not shown) forming the counterbore 19.

The shoulder 20 faces generally toward the thin wall 24 of the housing for purposes described below.

The end of the housing opposite the threaded side 22 is coaxially received within one end portion of the tubular connecting member 14 and secured, such as by brazing, to form a gas- and liquid-tight connection.

Preferably, the connecting member 14 is made of the same material and has the same wall thickness as the conduit 16 to which the drawer frame is attached.

As mentioned above, in practice, the conduit 16 is usually a copper tube, and in that case, the connecting member 14 is also formed of a steel tube, but for reasons that will become clear later, the conduit 1
．． The diameter is slightly larger than the diameter of 6.

The end of the connecting member 14 opposite to the side connected to the housing is bifurcated by drilling a transverse U-shaped slot in its wall portion.

That is, at the end of the connecting member 14, the connecting member is connected to the conduit 16.
Two opposed connecting legs 26 are formed for attachment to the conduit 16, and an arcuate curved portion or surface 28 preferably having the same radius of curvature as the outer circumferential surface of the conduit 16.

Attachment of the connecting member is accomplished by straddling the two legs 26 of the connecting member over the conduit and bringing the arcuate surface 28 into contact with the circumferential surface of the conduit to couple the bifurcated ends of the connecting member to the conduit. .

In the illustrated embodiment, the free end portions of the legs 26 project downwardly beyond the horizontal diameter of the conduit 16, as seen in FIG. 16, thereby temporarily attaching the connecting member to the conduit 16.

Alternatively, the length of the leg 26, defined by the distance between the arcuate surface 28 and the free end surface of the leg 26, is slightly shorter than the diameter of the conduit 16, and the connecting member is, for example, soldered. It can be fixed to the conduit by.

The connecting member and the conduit are made of the same material and have almost the same thickness, and can be easily heated to a temperature for soldering.
Fixation by soldering can be easily performed.

A generally cylindrical core member 30, preferably formed of hardened metal material, is coaxially received within the bores 18, 19 of the housing.

One end of the core member 30 is provided with a conduit reducing tip 32 that tapers toward its free end.

The tip 32 has a central through hole and a beveled end surface 34 forming a conduit cut or utility tip.

The combined length of the core member and tip 12 is made slightly greater than the distance from the free end of the crimp thin wall 24 to the proximal surface of the conduit 16.

The core member is therefore almost completely surrounded by the crimp 12, the cutting tip 12 of which penetrates the conduit 16 in the manner described below.

The core member has an inverted frusto-conical outer surface forming an annular tapered shoulder 36 facing toward the tip 32 between one and the other end thereof.

The core further comprises...a reduced diameter end portion 38 which is freely received within the inner bore 18 of the crimp, and a recessed bore 19 of the crimp.
a large diameter upper end portion 40 axially slidably received within the
has.

Core member 30 further has internal threads 42 at the end opposite tip 32 .

The internal threads 42 extend into the interior of the core near a beveled shoulder 44 and have a sealing surface 48 that sealingly engages the shoulder 44.
It receives a conventional air valve core 46 having a .

The internally threaded end of the core member 30 has a reduced diameter end and forms an annular shoulder 50 .

Male threaded cap 5 screwed onto the housing screw 22
2 urges the core member 30 towards the conduit 16 and applies the tip 32 of the core member to the conduit.

Cap 52 has a tapered wall surface 54 defining a closed end outwardly from the internally threaded portion thereof.

This surface 54 ... connects the thin-walled end 24 of the crimp to the core member 3.
The wall 24 is pressed against the reduced diameter end portion outward from the shoulder portion 50 of the
The core member 30 is held tightly in place by twisting or crimp the core member 30.

Preferably, the cap 52 is formed with a coaxial recess 56 that loosely surrounds the free end of the stem of the air valve core 46.

In the variant embodiment shown in FIG. 4, the crimp 12' is perpendicular to its longitudinal axis and
It has an annular shoulder 20' facing towards 4.

Core member 30' has an annular intermediate shoulder 36' perpendicular to its axis.

The shoulder 36'...seats and sealingly engages the shoulder 20' of the crimp.

The method of operating the device of the invention is as follows.

The housing 12 is connected to the connecting member 14 during manufacture as described above.

The core member 30 with air valve and cap 52 are delivered to a refrigerant service technician along with the assembled housing 12 and connection member 14.

The engineer connects the connecting member 14 to the conduit 1 to which the drawer frame is attached.
6 and solder as described above.

This soldering between the connecting member 14 and the conduit 16 does not necessarily have to be a fluid-tight connection for reasons discussed below, but it must be strong enough to withstand the conduit operation described below. .

The core 30 containing the air valve 46 is inserted axially into the counterbore 19 of the crimp, and the tip 32 of the core is inserted into the conduit 1.
6 surface.

In this position, the intermediate shoulder 36 of the core member
2 into the conduit 16 by a distance approximately equal to the desired depth of penetration from the shoulder 20 of the crimp.

Next, the cap 52 is manually rotated and screwed onto the threads 22 of the housing.

Attach a pair of wrenches (not shown) to the hexagonal head 21 of the crimp.
and the curved surface of the cap 52, and further rotate the cap 52 to screw it into the housing.

As the cap gradually approaches the housing head 21, the beveled inner surface 54 of the cap, which is in contact with the edge of the threaded end of the core member 30, moves the core member and thus its pointed end 3
2 is gradually penetrated into the wall of the conduit 16 in sealing relation.

At the same time, the shoulder 36 of the core member...shoulder 20 of the crimp
wedge-shaped engagement seat, thereby stopping axial advancement of the core member into the crimp.

When the edge of the threaded end 42 of the core member is flush with the housing wall 24, the beveled inner surface 54 of the cap contacts the free end portion of the crimp wall 24, causing the free end portion to become flush with the housing wall 24. is pressed against the reduced-diameter end portion outwardly from the shoulder portion 50 so as to form a sealing relationship.

Since the core member 30 is made of a relatively hard material such as steel, the point 32, when applied to the wall of the conduit 16, forms a gap between the outer surface of the point and the circumferential surface of the hole drilled in the conduit. between shoulders 36 and 20, forming an air-tight and liquid-tight seal.

A seal is also formed, and the thin wall 24 of the crimp forms a second seal around the upper peripheral surface of the threaded end of the core member.

Therefore, there is no need to form a fluid tight seal between the connecting member 14 and the conduit 16.

The inner bore of core member 30 thus communicates with the inner bore of conduit 16.

Remove the cap 52 and insert the air valve core 46 into the core member 3.
The refrigerant gas is passed through the conduit 16 by opening the inner hole of 0.
or can be extracted from a conduit.

The operating mode of the modified embodiment of FIG. 4 is also similar to that of FIGS. 1-3.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the valve components of the present invention. 2 is an elevational view of the valve and connecting member of FIG. 1 connected to a conduit; FIG. FIG. 3 is a longitudinal cross-sectional view taken along line 3-3 of FIG. FIG. 4 is a longitudinal sectional view showing a modified embodiment. Explanations of the symbols representing main parts in the drawings are as follows. 12... Housing, 14... Conduit connecting member, 16... Conduit, 18... Inner hole, 19... End cut, 20 ......Annular shoulder part, 21...Hexagonal head for wrench engagement, 22...
...Male thread, 24...Thin wall, 26...
・Connection leg, 28...Curved part, 30...
・Heart member, 32... Point for hollow conduit piercing, 34.
...Beveled end surface, 36...Annular tapered surface, 42...Female thread, 44...Beveled shoulder, 46...Air valve Core, 50... Annular shoulder, 52... Cap, 54...
Tapered wall surface.

Claims (1)

[Claims] 1 In an outlet setting valve for a conduit, the valve has a central through-bore, a flat outer surface for wrench engagement intermediate one end and the other, and defining a relatively thin wall at one end portion. A substantially cylindrical No-Uji puffer fish having a radial circumferential surface is provided, an annular shoulder facing toward the thin-walled end portion is formed on an inner surface intermediate between one end and the other end of the Uji puffer fish, and... a male thread is carved between the wrench-engaging outer surface and the thin wall portion;
One end of a cylindrical member is coaxially fixed to the end of the no-uji puffer on the opposite side to the side where the male thread is located, and the other end of the cylindrical member is formed into a fork shape, and an outlet is attached. forming a U-shaped slot defining a curved portion having a radius of curvature substantially the same as the outer peripheral surface of the conduit to be provided and a pair of legs capable of holding the conduit to be provided with the outlet; The wall thickness of the member is substantially equal to the wall thickness of the conduit to which the outlet is to be provided, and has a length slightly greater than the distance from the free end surface of said thin-walled portion of the housing to the curved portion of said U-shaped slot. A cylindrical core member having a diameter is coaxially and loosely housed in the inner hole of the Ujifugu, and the core member has a cylindrical core member facing toward the conduit in the position where the conduit to be provided with the outlet is fitted into the U-shaped slot. forming a tapered reduced diameter end portion, and forming a beveled end surface defining a conduit instance tip at a distal end of the tapered reduced diameter end portion;
An annular shoulder facing toward the conduit tip is formed on the outer surface intermediate the one end and the other end of the core member, and an end portion of the core member opposite to the side with the conduit tip is formed with an annular shoulder portion facing toward the conduit tip. . . . forming a reduced diameter circumferential surface defining an annular shoulder proximate said thin-walled portion of the Ujipuffer; a seat is formed on the inner surface of the core member at the innermost end of the female thread, an air pad is disposed in sealing engagement with the seat in the core member, and a cap is screwed onto the male thread of the housing. and the inner surface of the cap is formed with a beveled end surface that engages the outer end surface of the core member adjacent thereto, and as the cap is gradually threaded into the housing, the beveled end surface of the cap becomes While the outer intermediate shoulder portion of the core member is seated and sealingly engaged with the inner wall portion of the pufferfish, the conduit tip of the core member is inserted into the conduit to be provided with an outlet, and then: - An outlet setting valve configured to contact the outer end surface of the thin-walled portion of the pufferfish and press it inward to press against the outer outer surface of the annular shoulder of the core member.