JPH0710678U - Pipe fitting - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pipe joint which can be easily connected and disconnected without leaking or damaging the packing by hand tightening without using a tool even when used for a high pressure fluid. [Structure] An annular packing 2 for end face sealing is arranged at one end of a pipe joint, and a protective ring 3 elastically springed by a spring 4 is slidably provided on the outer circumference of the packing 2. In this case, the engaging portion 7 formed on the inner peripheral surface of the protection ring 3 is configured to be engaged with the engaging portion 8 formed on the outer peripheral surface of the annular packing 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe joint which is used for connecting a hose to a hydraulic unit, for example, and which is particularly suitable for high pressure.

[0002]

[Prior art]

 For example, when the screw connection end of a pipe joint for connecting a hose or the like to the hydraulic unit is screwed into the screw connection end of the hydraulic unit, it is extremely difficult to stop the leakage of the high-pressure fluid at this screw part. For this reason, in pipe fittings used for such high-pressure fluid, packing is attached to the base of the screw connection end, and the tip annular surface of the mating screw connection end is abutted against this to prevent leakage. Has been widely practiced from the past.

However, in such a structure, if the degree of compression of the packing such as the seat packing is weak, the leakage of the high pressure fluid cannot be prevented, or the packing is pushed outward by the high pressure fluid and is damaged. It is tightly connected by tools as it may not be possible to prevent leakage. For this reason, threaded pipe fittings were not suitable for locations where connections and disconnections were frequently made.

[0004]

[Problems to be solved by the device]

 The present invention solves the problems of the conventional pipe fittings used for high-pressure fluids, such as the difficulty in preventing fluid leakage, the packing being easily damaged, and the need for firm connection with a tool when screwing. Is what you are trying to do.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides an annular packing for end face sealing at one end of a pipe joint, and a spring-loaded protective ring is provided on the outer periphery of the packing in a sliding manner. It was

In this case, it is preferable that the engaging portion formed on the inner peripheral surface of the protective ring is engaged with the engaging portion formed on the outer peripheral surface of the packing so that the protective ring does not retract more than necessary.

[0007]

[Action]

 Since the pipe joint of the present invention is configured as described above, first, when the thread portion of the pipe joint body of this pipe joint is screwed into the thread portion of the connected pipe body, the tip annular surface of this thread portion is Press on the packing for the end face seal and contact the protection ring. At this time, the protective ring resists the elastic force of the spring and withdraws after the distance that the packing is crimped.

Further, the outer circumference of the annular packing is guided by the protection ring, and the tip end surface of the protection ring is in contact with the tip end annular surface due to the elastic force of the spring and there is no gap between them, so that the fluid pressure causes The compressed packing will not be pushed out of here. Even if a pressing force acts on the protection ring, it will be locked to the engaging part formed on the inner peripheral surface of the protection ring and the outer peripheral surface of the packing, so it will not be pushed back more than necessary and the packing will pop out to the outside. Prevent that. Therefore, this pipe joint can be connected to the connected pipe body by hand tightening even in the case of being used under high pressure.

[0009]

【Example】

 1 is a semi-mounted sectional side view showing an embodiment of the pipe joint of the present invention, and FIG. 2 is a partially enlarged sectional view of FIG. In FIGS. 1 and 2, 1 is a tubular pipe joint body, 2 is an annular packing having a substantially rectangular cross section, 3 is a cylindrical protective ring, 4 is a spring (coil spring), and 5 is a pipe joint. An adapter provided at the other end of the main body 1, and 6 shown by a chain double-dashed line is a connected pipe body connected to a hydraulic unit or the like. Further, 1a is a male threaded connection end of the pipe joint body 1, 3a is a tip end surface of the protection ring 3, 6a is a female threaded connection end of the pipe body 6 to be connected, and 6b is an annular tip end surface thereof. .

A circumferential groove 10 is formed at the base of the male thread type connection end 1 a at one end of the pipe joint body 1, and an annular projection 9 formed at one end of the inner circumference of the annular packing 2 is formed in the circumferential groove 10. The protective ring 3 is mounted so as to be locked and prevented from coming out, and a protective ring 3 which is elastically springed by a spring 4 and slides on the outer peripheral surface 1b of the fitting main body 1 is mounted on the outer periphery thereof. As shown in FIG. 1, when this male thread type connection end 1a is screwed into the female thread type connection end 6a of the pipe body 6, the tip annular surface 6b of the female thread type connection end 6a is attached to the packing 2. When pressure-bonded, both abut on the tip surface 3a of the protection ring 3.

In addition, the engagement portion 7 formed on the inner peripheral surface of the protection ring 3 and the engagement portion 8 formed on the outer peripheral surface of the packing 2 are locked, and the packing 2 receives the internal pressure and is pushed outward. When it tries to come out, it prevents the protective ring 3 from being pushed back more than necessary, and also prevents the packing 2 from popping out. Further, the annular projection 12 formed on the outer peripheral end of the protection ring 3 is locked by the annular projection 12 formed on the inner peripheral surface of the cover 13 provided on the outer periphery of the protection ring 3 to prevent the slide ring from coming off. Has become. The cover 13 is fixed to the pipe joint body 1 by machine screws 14.

The adapter 5 is inserted into the pipe joint body 1, and at this insertion portion, a circumferential groove 5 a provided on the inner peripheral surface of the adapter 5 and a circumferential groove provided on the inner peripheral surface of the pipe joint body 1. A large number of balls 15 are put in an annular space formed by 1c to rotatably fix the adapter 5 and the pipe joint body 1, and an O-ring 16 connects the adapter 5 and the pipe joint body 1 to each other. Keeps the seal between. The screw hole 1d of the pipe joint body 1 is also used for enclosing the ball 15.

Next, the operation will be described based on the above-described embodiment. First, when the male thread type connecting end 1a of the pipe joint body 1 of this pipe joint is screwed into the female type connecting end 6a of the connected pipe body 6, the tip annular surface 6b of the female screw type connecting end 6a is It is pressed against the packing 2 for end face sealing and abuts on the protection ring 3. At this time, the protection ring 3 moves back against the elastic force of the spring 4 by the distance to which the packing 2 is pressed.

Further, the outer circumference of the annular packing 2 is guided by the protective ring 3, and the tip surface 3 a of the protective ring 3 is in contact with the annular tip surface 6 b by the elastic force of the spring 4, and between the two. Since there is no gap, the packing 2 compressed by the fluid pressure is not pushed outward from here. Even if a pressing force acts on the protective ring 3, the engaging portion 7 formed on the inner peripheral surface of the protective ring 3 and the engaging portion 8 formed on the outer peripheral surface of the packing 2 are engaged and pushed back more than necessary. And the packing 2 is securely prevented from popping out. Therefore, this pipe joint can be connected to the connected pipe body 6 by hand tightening even when used for high pressure. In the embodiment, the pipe joint side is the male thread and the connected pipe body is the female thread, but the opposite configuration may be adopted.

The adapter 5 for connecting a hose or the like to this pipe joint is rotatably connected to the pipe joint body 1, so that when the screw is connected to the hose or the like, the adapter 5 remains as it is. Only the main body 1 can be rotated and connected.

[0016]

[Effect of device]

 The fitting of the present invention can be used without leaking or damaging the packing. In particular, it is a pipe joint suitable for high-pressure fluid. In addition, it can be easily connected to a hose by hand tightening without using tools, etc., which is especially effective for frequently used places.

[Brief description of drawings]

FIG. 1 is a semi-mounting sectional side view showing an embodiment of a pipe joint of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

[Explanation of symbols] 1 Pipe joint body 1a Male thread type connection end 1b Outer peripheral surface 2 Packing 3 Protective ring 3a Tip surface 4 Spring 5 Adapter 6 Connected pipe body 6a Female threaded connection end 6b Tip annular surface 7 Engaging part 8 Engagement part

Claims (2)

[Scope of utility model registration request] 1. A pipe joint in which a ring-shaped packing for end face sealing is arranged at one end of the pipe joint, and a protective ring elastically spring-loaded is slidably provided on the outer periphery of the packing. 2. The pipe joint according to claim 1, wherein the engagement portion formed on the inner peripheral surface of the protection ring is configured to engage with the engagement portion formed on the outer peripheral surface of the annular packing.