JPH05312439A - Pipe end sealer - Google Patents

Abstract

PURPOSE:To prevent a sealing surface from corroding by bringing a lip part provided on a pipe end sealer for sealing the open end into contact with a large diameter part or a tapered portion formed on the pipe keeping water tightness to protect the sealing surface formed on a pipe outer surface. CONSTITUTION:A resin cap 20 as a pipe end surface sealing tool, which prevents an end surface of a charge valve 26 serving to fill or recover a refrigerant in a freezing cycle, includes a body part 202 having an outer periphery 201 and an inner periphery 203 both provided to fit to an outer periphery and an inner periphery of the charge valve 26, and the inner periphery 203 is combined with the inner periphery of the charge valve 26 with a screw. On the inner periphery surface of the outer periphery 201 a U-shaped section lip part 22, which comprises an elastic material such as rubber, is provided integrally with the cap 20. A tip end 222 thereof contacts water-tightly with a tapered part 262 next to a large diameter part 263 of the valve 26. A rubber packing 24 is fitted to a space part bottom part between the inner and outer peripheries 201 and 203.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe end face sealer, and is particularly effective when used as a cap for preventing corrosion of the end face of a service valve that fills or recovers a refrigerant during a refrigeration cycle forming a refrigeration system. Is.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a pipe between a receiver 62 and an expansion valve 64 provided in a refrigeration cycle 57 for filling a refrigerant into a refrigeration cycle used in a vehicle air conditioner. The charge valve 26 is disposed at 58. When charging the refrigeration cycle 57 with a refrigerant, a socket 28 is fitted around the charge valve 26, and the charge valve 26 is inserted from the socket 28 side.
Refrigerant flows into the inside of the side to fill the refrigerant in the piping 30 of the refrigeration cycle.

As shown in FIG. 3, the ball 40 provided in the socket 28 is the second tapered surface 26 of the charge valve 26.
By fitting in 4, the charge valve 26 and the socket 28 are fixed to each other. Also, at this time, the socket 2
The O-ring 32 provided at 8 closely contacts the sealing surface 260 of the first small outer diameter portion 261 of the charge valve 26, thereby airtightly maintaining the gap between the charge valve 26 and the socket 28.

After the charging of the refrigerant, the socket 28 is pulled out, and as shown in FIG. 7, the threaded portion 215 of the inner peripheral portion 213 provided on the cap 21 is provided with the threaded portion 266 provided on the inner peripheral side of the charge valve 26. Screw in and fix. A rubber-like packing 24 is provided in order to prevent the refrigerant from leaking between the threaded portion 215 of the cap 21 and the threaded portion 266 of the inner diameter of the charge valve.

[0005]

In the above-mentioned conventional cap, the rubber-like packing 24 is disposed so that the gap between the screw portion 266 on the inner peripheral side of the charge valve 26 and the screw thread portion 215 of the cap 21 is provided. It is possible to prevent the refrigerant from leaking to the outer peripheral side of the charge valve 26.

However, as shown in FIG. 3, when the socket 28 is fitted on the outer periphery of the charge valve 26 in order to fill the refrigerant in the refrigeration cycle 57, the O-ring 32 provided in the socket 28 is sealed. Charge valve 26
The sealing surface 260 of the first small outer diameter portion 261 has a gap between the sealing surface 260 and the inner peripheral surface of the cap 21 as shown in FIG. ing.

During normal running of the vehicle, especially in a salt-damaged area, a corrosive factor enters this gap, and the first small outer diameter portion 2
There is a problem that the sealing surface 260 of 61 is corroded.
When the sealing surface 260 corrodes, the socket 28 is charged with the charge valve 26 in order to fill the refrigerant in the refrigeration cycle 57.
When it is fitted and fixed in, the gap between the O-ring 32 and the seal surface 260 cannot be sufficiently sealed, which may cause the refrigerant to leak to the outside.

Therefore, an object of the present invention is to provide a cap capable of preventing the sealing surface of a valve fitted with a socket from being corroded.

[0009]

In order to achieve the above object, the present invention has a small diameter portion formed on the opening end face side, and an outer diameter larger than the small diameter portion formed on the side opposite to the opening end face side from the small diameter portion. A large-diameter portion having, and a taper portion formed between the small-diameter portion and the large-diameter portion and connecting the outer peripheral surface of the small-diameter portion and the large-diameter portion, and a sealing surface on the outer surface of the small-diameter portion. In a pipe end face sealer for sealing an open end face of a formed pipe, a first cylindrical portion having a cylindrical shape, a second cylindrical portion provided on an outer periphery of the first cylindrical portion, and the first cylindrical portion and the first cylindrical portion. 2 a bottomed cylindrical main body portion having one end surface on one side of the cylindrical portion, and an end surface portion that communicates both the cylindrical portions; and a lip portion provided on the inner peripheral surface of the second cylindrical portion of the main body portion. And a state in which the valve body is fitted from the open surface side of the main body portion toward the small outer diameter portion of the valve. The main body portion is fitted to the inner peripheral surface of the valve on the outer peripheral surface of the first cylindrical portion, and the lip portion contacts at least the taper portion or the large diameter portion of the pipe in a watertight manner. A pipe end face sealing tool characterized by the above is adopted.

In a preferred embodiment, the pipe end face sealing member whose lip portion is made of an elastic material is adopted.

[0011]

According to the cap of the present invention having the above structure,
In order to protect the sealing surface formed on the outer surface of the small diameter part of the pipe, the lip part provided on the pipe end face sealing tool that seals the opening end face of the pipe is the tapered part or the large diameter part formed on the pipe. It is designed to be in contact with watertightness.

Since the pipe end face sealer is fitted from the small diameter portion side formed on the opening end face of the pipe, the lip portion and the pipe are in watertight contact with each other at the tapered portion or the large diameter portion formed on the pipe. If so, the small-diameter portion of the tube formed inside is blocked from the outside. Therefore, the corrosion factor does not enter from the outside.

Further, by using an elastic material for the lip portion, the adhesion between the lip portion and the valve is further improved, and it is possible to more effectively prevent corrosion factors from entering from the outside.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment using a charge valve cap of the present invention will be described below with reference to the drawings.

FIG. 1 is a half sectional view of a charge valve cap 20 according to a first embodiment of the present invention when the cap 20 is fitted to a charge valve 26. FIG. 2 is a cross-sectional view of the lip portion 22 provided on the cap 20, and FIG. 3 is a half cross-sectional view when the charge valve 20 and the socket 28 are fitted together.

As shown in the sectional view of FIG.
Includes an outer peripheral portion 201 provided so as to be fitted on the outer peripheral side of the charge valve 26, an inner peripheral portion 203 provided so as to be fitted on the inner peripheral side of the charge valve 26, an outer peripheral portion 201 and an inner peripheral portion 203. It is composed of a main body portion 202 connected to and provided in the outlet side direction of the charge valve 26. The cap 20 is made of resin.

A screw thread portion 205 is provided on the inner peripheral portion 203 of the cap 20, and the screw thread portion 205 is screwed into a screw portion 266 provided on the inner peripheral side of the charge valve 26.

A lip portion 22 made of an elastic material such as an elastomer or a rubber material is provided on the inner peripheral surface of the outer peripheral portion 201, and the lip portion 22 and the cap 20 are integrally molded.

Since the elastomer has a property intermediate between the resin and the rubber, it has good compatibility with the resin and good adsorbability with each other, but the rubber has poor compatibility with the resin and thus has a bad compatibility with the resin. Adsorption is not good.

As shown in FIG. 2, the lip portion 22 of the present embodiment.
Has a U-shaped cross section, and the inner peripheral side surface 222 of the inner peripheral side portion 221 of the lip portion 22 is formed to have an angle α with respect to the center line direction of the cap 20.

Further, the rubber-like packing 24 has a cap 2
It is provided in the space formed by the outer peripheral portion 201 of 0, the main body portion 202, and the inner peripheral portion 203. From the tip 25 side, the tip portion of the charge valve 26 has a first small diameter portion 261 having a small radius from the center to the outer peripheral surface, a first large diameter portion 263 having a large radius from the center to the outer peripheral surface, and a first small diameter portion 261. 2nd small diameter part 265 whose radius from the center to the outer peripheral surface is small similarly to
And a first taper portion 262 connecting the first small diameter portion 261 and the first large diameter portion 263, and a second taper portion 264 connecting the first large diameter portion 263 and the second small diameter portion 265. It has a shape. The shape of the tip of the charge valve 26 is based on the Japan Refrigeration and Air Conditioning Industry Association standard (JRA standard).

As shown in FIG. 3, the charge valve 26 has a radius from the center to the outer peripheral surface of the first large diameter portion 26.
The second large diameter portion 267 having the same diameter as the third diameter, the third small diameter portion 268 having a small radius from the center, the connecting portion 269 having the T-shaped communication hole 271 formed therein, the second small diameter portion 265 and the second large diameter portion. A third taper portion 272 that communicates with the diameter portion 267, and a fourth taper portion 2 that communicates with the second large diameter portion 267 and the third small diameter portion 268.
It is equipped with 73.

On the inner peripheral surface 274 of the charge valve 26, the screw portion 2 to be screwed with the screw thread portion 205 of the cap 20.
66 is formed, and a hole 275 having a circular cross section is formed from the screw portion 266 to the communication hole 271.

In addition, the hole 27 inside the charge valve 26
5, a fixed portion 54 provided so as to be joined to the inner peripheral surface 274 of the charge valve 26, a moving portion 52 that is provided so as to be movable in the direction of the hole 275 and that is joined to the fixed portion 54,
There is provided a rod portion 51 that is integrally provided with the moving portion 52, and a worm portion 50 that includes an O-ring 56 that seals between the inner peripheral surface 274 of the charge valve 26 and the fixed portion 54. When the socket 28 is not connected, the fixing portion 5
4 is configured to close the gap between the moving section 52 and the moving section 52.

As shown in FIG. 5, the charge valve 26 is provided in a refrigerant pipe 58 through which a refrigerant flows in a refrigerating cycle 57 forming an air conditioner. 60
Is a condenser, 62 is a receiver, 64 is an expansion valve, 66 is an evaporator, and 68 is a compressor. In the case of the illustrated example, the charge valve 26 for injecting and discharging the refrigerant is
It is provided between the receiver 62 and the low pressure side of the expansion valve 64. As shown by the broken line, the charge valve 26 may be provided between the evaporator 66 and the low pressure side of the compressor 68 and on the high pressure side of the compressor 68.

On the other hand, the socket 28 is a device which is connected to the charge valve 26 when the refrigerant is filled in the refrigeration cycle 57. When the socket 28 is connected to the charge valve 26, the rod-shaped valve body 48 causes the rod portion 51 of the worm portion 50 to move.
Is pressed to form a gap between the fixed portion 54 and the moving portion 52. Further, the ball 40 provided in the socket 28 is fitted into the second tapered portion 264 of the charge valve 26, so that the charge valve 26 and the socket 28 are connected and fixed. Charge valve 26 and socket 28
At the time of connection with the first small diameter portion 2 of the charge valve 26, the O-ring 32 for sealing provided on the socket 28
Close the gap with 61. The O-ring 32 closely contacts the gap between the charge valve 26 and the socket 28 so that the refrigerant flowing from the socket 28 side to the charge valve 26 side does not leak to the outside through the gap between the socket 28 and the charge valve 26. Is configured.

The tip portion 221 of the lip portion 22 is provided with an angle α, so that the tip portion 221 is moved to the charge valve 26.
The first taper portion 262 is less likely to be caught in the inner circumferential direction, and is smoothly pressed in the outer diameter direction. The tip portion 221 is pressed in the outer diameter direction, and the repulsive force of the tip portion 221 presses the lip portion 22 in the inner peripheral direction.
The tapered surface 262 and the cap 20 are surely brought into close contact with each other.

That is, when the cap 20 shown in FIG. 1 is used except when charging the refrigerant as in the present configuration, the inner peripheral side portion 222 of the lip portion 22 has the first taper portion 26 of the charge valve 26.
O-ring 3 which is placed in close contact with the socket 2 and is therefore arranged so that the refrigerant does not leak when the refrigerant is filled with the socket.
It is possible to prevent a corrosive factor such as water or salt from flowing into the sealing surface 260 of the first small diameter portion 261 that is in close contact with the second.

If the sealing surface 260 of the first small diameter portion 261 corrodes, the adhesion by the O-ring 32 will deteriorate when connecting with the socket 28, and the refrigerant may leak. However, by configuring as in this embodiment, the first small diameter portion 261
It is possible to prevent corrosion factors from entering into the sealing surface 260 and prevent corrosion, and thus prevent leakage of the refrigerant.

The charge valves 26 have the above-mentioned muss section 50 incorporated therein and are normally in a closed state. When the socket 28 is fitted and fixed to the charge valve 26, the muscular portion 50 is opened, and the refrigerant flows into the hose 70 arranged in the socket 28 and is guided to the refrigerant collector 72.

Next, as shown in FIG. 4, another embodiment of the lip portion will be described. As shown in FIG. 4A, when the lip portion 74 having a U-shaped lip and a hemispherical hemispherical portion 741 provided at the tip is used for the cap 20 shown in FIG. 1, the hemispherical portion 741 is attached to the tip. For the charge valve 2
6 has good adhesion to the first taper portion, and the tip is not caught when the cap 20 and the charge valve 26 are fitted together.

In this shape, the tip portion 741
Comes into close contact with the first tapered portion 262 of the charge valve 26. As shown in FIG. 4B, the L-shaped lip portion 76.
The tip portion 761 has a V-shape that is obliquely cut from both sides. When this lip portion 76 is used in the cap 20 shown in FIG. 1, since the tip portion 761 has a V shape, the adhesion with the first taper portion of the charge valve 26 is good, and the cap 20 and the charge valve 26 are fitted together. At the time of joining, the tip is not caught.

In this shape, the tip portion 761
Comes into close contact with the first large diameter portion 263 of the charge valve 26.
As shown in FIG. 4C, the tip portion 781 has an L-shaped lip portion 78 and is cut obliquely. Even when this lip portion 78 is used in the cap 20 shown in FIG.
Adhesion with the taper portion is good, and the tip is not caught when the cap 20 and the charge valve 26 are fitted.

In this shape, the tip portion 761
Comes into close contact with the first large diameter portion 263 of the charge valve 26.
As shown in FIG. 4D, the tip portion 801 is formed in a spherical shape by the L-shaped lip portion 80. Even if the lip portion 80 is used in the cap 20 shown in FIG. 1, the adhesion with the first taper portion of the charge valve 26 is good, and the tip is not caught when the cap 20 and the charge valve 26 are fitted.

In this shape, the tip portion 761
Comes into close contact with the first large diameter portion 263 of the charge valve 26.
As shown in FIG. 4E, the U-shaped lip portion 82 forms a semi-triangle at the tip portion 821. Even if this lip portion 82 is used for the cap 20 shown in FIG.
Has good adhesion to the first taper portion, and the tip is not caught when the cap 20 and the charge valve 26 are fitted together.

In this shape, the tip portion 741
Comes into close contact with the first tapered portion 262 of the charge valve 26. As shown in FIG. 4F, the U-shaped lip portion 84
Then, a triangle is formed at the tip portion 841. This lip part 8
Even when 2 is used for the cap 20 shown in FIG. 1, the adhesion with the first tapered portion of the charge valve 26 is good, and the tip is not caught when the cap 20 and the charge valve 26 are fitted.

In this shape, the tip portion 741
Comes into close contact with the first tapered portion 262 of the charge valve 26. As shown in FIG. 4G, the L-shaped lip portion 86.
Thus, the tip portion 861 may be formed thick. In addition, in this shape, the tip portion 761 is in close contact with the first large diameter portion 263 of the charge valve 26.

As shown in FIG. 6, the outer peripheral portion 2 of the cap 23
31 along the inner peripheral side of the main body portion 232.
The configuration may be such that 0 is provided. At this time, the packing 24 shown in the first embodiment is unnecessary, and the effect of the packing 24 and the effect of the lip portion 22 of the first embodiment can be obtained only by the lip portion 90.

When the lip portion 90 is made of rubber, it does not work well with the cap 23 made of resin, so that the lip portion 90 is pulled out so that it does not come off. The stop portion 234 is formed. By making the radius of the retaining portion 234 from the center the same as the inner peripheral side surface 91 of the lip portion 90, it is possible to perform integral molding.

[0040]

As described above, according to the pipe end face sealer of the present invention, the lip portion of the pipe end face sealer is used to protect the sealing surface formed on the outer surface of the small diameter portion of the pipe. The small diameter portion of the pipe is shielded from the outside by contacting the tapered portion or the large diameter portion while maintaining watertightness. Therefore, the corrosion factor does not enter from the outside, and it is possible to prevent the small outer diameter portion from corroding.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment when a charge valve according to the present invention and a cap are fitted together.

FIG. 2 is a half sectional view showing an embodiment of a lip portion used in the cap of the present invention.

FIG. 3 is a half cross-sectional view when the charge valve and the socket are fitted together.

4 (a), (b), (c), (d), (e),
(F), (g) is a half cross-sectional view showing an embodiment of the lip portion used in the cap, respectively.

FIG. 5 is a schematic diagram showing a connection point where a charge valve is used in a refrigeration cycle of an air conditioner.

FIG. 6 is a half sectional view showing an embodiment when the charge valve and the cap of the present invention are fitted together.

FIG. 7 is a cross-sectional view of essential parts when a conventional charge valve and a cap are fitted together.

[Explanation of symbols]

 20 Cap 22 Lip Part 24 Packing 26 Charge Valve 261 First Small Diameter Part 262 First Tapered Part 263 First Large Diameter Part 28 Socket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Ogura 1-1, Showa-cho, Kariya city, Aichi prefecture

Claims (3)

[Claims] 1. A small diameter portion formed on the opening end face side, a large diameter portion formed on the side opposite to the opening end face side from the small diameter portion, and having a larger outer diameter than the small diameter portion, and the small diameter portion and the large diameter portion. A pipe end face sealer for sealing an opening end face of a pipe having a taper portion formed between and having a small diameter portion and an outer peripheral surface of the large diameter portion continuous with each other, and a sealing surface formed on an outer surface of the small diameter portion. In a cylindrical first cylindrical portion, a second cylindrical portion provided on the outer periphery of the first cylindrical portion, and one side surface of the first cylindrical portion and the second cylindrical portion which communicate with each other. A bottomed cylindrical main body portion having an end surface portion and a lip portion provided on the inner peripheral surface of the second cylindrical portion of the main body portion, In a state where the main body portion is fitted toward the small outer diameter portion of the valve, the main body portion is located on the outer peripheral surface of the first cylindrical portion. Engaged with the inner peripheral surface of the valve, the lip portion, the pipe end face, characterized in that the contact maintains a tapered portion or the large diameter portion and a watertight least the tube closure. 2. The pipe end face sealing device according to claim 1, wherein the lip portion is made of an elastic material. 3. The inner peripheral surface of the second cylindrical portion of the tube end surface sealing device is formed so that the radius from the center becomes equal or larger toward the surface side that is open from the end surface side. 1
Alternatively, the pipe end surface sealing device according to claim 2.