JPS6224878Y2 - - Google Patents

Description

[Detailed explanation of the invention] Both the socket and plug are equipped with separate valve bodies,
A type of pipe joint in which the valve bodies push against each other and open when the two are connected is known as a pipe joint used for high-pressure piping. As stated in the publication, the inner diameter of the opening end of the socket and the outer diameter of the insertion end of the plug are the same diameter or close to the same diameter, so the outer diameter of the plug is large. As the pressure increases, it is inevitable that the pressure-receiving area of the socket and plug will increase proportionally.
For this reason, if a locking mechanism using a locking ball and a locking groove is adopted as a connection/separation method for the socket and plug, and used in high-pressure piping, the force that attempts to separate the socket and plug will be applied to the locking ball and locking groove, and the fluid will be released. When the lock ball is strongly applied with pressure, at least one of the locking grooves is often pressed and deformed, which causes the socket and the plug to come apart inadvertently.
Therefore, in order to prevent such a situation from occurring, the locking mechanism has usually been subjected to heat treatment. Furthermore, as is clear from the above-mentioned known example, the conventional structure of this type of pipe joint is to provide a seal ring on the inner circumferential surface of the socket, so that the connection between the socket and the plug is difficult. When the condition becomes unstable due to the deformation of the locking mechanism as described above, a phenomenon occurs in which sufficient sealing performance cannot be maintained with only one seal ring. Furthermore, a particularly serious problem is that the outer peripheral surface of the plug side that is sealed by the seal ring is completely exposed to the outside, so it is originally polished to a high degree of precision, and the integrity of the seal is compromised. The outer circumferential surface, which is intended to be easy to attach and detach, is scratched, causing a significant reduction in sealing performance, and when it is scratched, the ease of attachment and detachment is also reduced.

The present invention focused on the fact that conventional high-pressure pipe joints have the various drawbacks mentioned above.The present invention aims to reduce the pressure-receiving area of the socket and plug as much as possible, and to improve the integrity of the seal between them. The present invention relates to a high-pressure pipe joint devised for the purpose of improving the ease of attachment and detachment, and one embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the socket 22, Figure 2 shows the plug 25.
The socket 22 has a cylindrical rear body 1 and a front body 10 which is screwed and fixed to the front part of the socket 22 to form a main socket body, and the plug 25 is attached to the front part of the socket 22. It is formed to have an outer diameter dimension that allows it to fit inside the part body 10.

Details of the socket 22 and plug 25 will be explained individually below.

In FIG. 1, the tip of the rear body 1 of the socket 22 has a reduced radius near the threaded part with the front body 10, and is formed into a guide tube with an outer diameter that has a predetermined fitting tolerance with the inner diameter of the plug 25. 3 is provided to protrude toward the front body 10. Reference numeral 2 denotes a valve seat provided in a tapered shape at the base of the guide cylinder 3, and a cone-shaped valve body 4 housed in the rear body 1 is urged from behind by a compression spring 5 to seat on the valve seat 2. Reference numeral 11 denotes an insertion hole for a plug 25 which is provided to penetrate inside the front body 10 in the axial direction.A suitable number of tapered holes 12, 12 are formed in the circumferential direction of the tip of the front body 10, and the taper holes 12, 1
Lock balls 13, 13 having a diameter larger than the wall thickness of the front body 10 are housed in the lock balls 2.

Reference numeral 20 denotes a sleeve slidably attached to the outer periphery of the front body 10 in the axial direction, and the inner peripheral surface of the tip end of this sleeve 20 has a pressing part 21 for pressing the lock ball 13 in the centripetal direction and a releasing part for the lock ball. A compression spring 15 is fitted between the side surface of the pressing portion 21 and a stepped portion 14 provided on the outer circumferential surface of the distal end of the front body 10, and the sleeve 20 is elastically moved to the left in FIG. , the pressing part 21 is the lock ball 13
energized to press. Reference numeral 16 denotes a stop ring fitted to the outer periphery of the front end of the front body 10;
0 is prevented from escaping from the front body 10.

Next, the plug 25 will be explained.

The plug 25 has a locking groove 2 on the outer periphery of the central part of the plug body 26, which engages with the lock balls 13, 13.
7 is formed in the circumferential direction. The inner circumferential surface 28 of the tip end of the fluid passage passing through the axial center of the plug body 26 is a fitting part with the guide tube 3 described above, and an annular groove 29 provided in the circumferential direction of the same surface 28 has a groove inside the plug. A seal ring 30 is attached to seal the joint surface between the circumferential surface 28 and the outer circumferential surface of the guide tube 3. A locking portion 31 is provided in an annular shape at the back of the fluid passageway and protrudes toward the center. A valve seat 32 is formed in a tapered shape inside the locking portion 31, and a cone-shaped valve body 33 is inserted from the rear. It is elasticized by a compression spring 34 and is seated on the valve seat 32.

Next, the operation of the above embodiment will be explained.

To connect the socket 22 and plug 25,
First, the sleeve 20 is moved backward against the elastic force of the compression spring 15, and the lock balls 13 are released.

When the plug 25 is inserted into the socket 22 in this state, in the process, the guide tube 3 on the socket 22 side first enters the inner circumferential surface 28 of the tip end of the plug 25, and the guide tube 3 on the socket 22 side also comes into contact with the front body 10. The front end surface 35 of the plug 25 enters between the cylinder 3 and the socket 22 and the plug 25 are in a double fitted state.
A seal ring 30 provided on the inner peripheral surface 28 of the tip of the plug 25 completely seals the outer peripheral surface of the guide cylinder 3.
Continuing, the cone-shaped valve body 33 on the plug 25 side,
The cone-shaped valve body 4 on the socket 22 side presses against each other and retreats against the compression springs 5 and 34, respectively, and the valve bodies 4 and 33 are separated from their respective valve seats 32 and 2, and the fluid passage is opened. It becomes like this. Therefore, when the locking ball 13 on the socket 22 side and the locking groove 27 on the plug 25 side are engaged as is known, the seal ring 30 closes the outer circumferential surface of the guide tube 3 and the inner circumferential surface of the plug 25. 28 is in a sealed state, allowing high pressure fluid to flow between the socket 22 and the plug 25.

Although the embodiments have been described above, the high pressure pipe joint of the present invention has a front body 10 equipped with a ball 13 as a locking element of a locking mechanism such as a ball lock type.
and a rear body 1 having a valve body 4 in a fluid passageway, a socket 22 forming a main body, and the locking element 1.
The plug 25 has a locking groove 27 on its outer periphery for locking the valve body 3 and a valve body 33 in the fluid passage. 33 In a type of pipe joint in which the fluid passages are opened together by pressing against each other, a groove 29 is provided in the inner peripheral surface of the tip end of the plug 25 in the circumferential direction.
A seal ring 30 is fitted into the groove, and the front part of the rear body 1 of the socket 22 protrudes into the front body 10, and the outer peripheral surface of the socket 22 is connected to the seal ring 30. Since the guide tube 3 is provided with the guide tube 3 sealed by the guide tube 30, the following effects are achieved.

The pressure receiving surface of the fluid pressure is the inner peripheral surface 28 of the tip of the plug.
The outer diameter of the guide tube 3 is the same as the front body 1 which is the main tube of the socket 22.
0, and the pressure receiving area of the guide tube 3 can be made as small as possible in relation to the width dimension of the front end surface 35 of the plug 25, making it easy to connect the socket and the plug. This is a small value determined by the outer diameter of the fluid guide tube 3, which facilitates the connection of the plug and socket.

Next, the present invention does not seal the outer circumferential surface of the plug, but seals the outer circumferential surface of the guide tube 3 protruding into the front body of the socket with the seal ring 30 attached to the inner circumferential surface of the tip end of the plug. Therefore, compared to conventional pipe fittings that seal the outer circumferential surface of the plug with a seal ring provided on the inner circumferential surface of the tip of the socket,
Since the guide cylinder is not subjected to large pressure of the fluid when high-pressure fluid flows, there is no fluid pressure applied to the front end surface 35 of the plug when the socket and plug are connected, and the range of application of high-pressure fluid is reduced to that of conventional pipe joints. It can be expanded significantly compared to . For example, conventionally, the normal pressure was 140Kg/cm ² and the maximum pressure was 210Kg/cm 2 .
cm ² pipe fittings of the same size, normal pressure 210
The range of use can be expanded to fluids with a maximum pressure of 315 kg/cm ² and a maximum pressure of 315 kg/cm ² .

In this way, the pressure receiving area of the socket end face (guide cylinder end face) and the pressure receiving area of the plug opening face are made small, and the seal ring 30 is attached to the inner peripheral surface 28 of the plug 25.
If a locking mechanism is provided, even if a force is applied to separate the socket and plug in the coupled state, or even if the fluid pressure is large, the locking mechanism, that is, the socket 22
Since no load is applied to the locking ball 13 and the locking groove 27 of the plug 25, the separation force due to the fluid pressure acting between the socket and plug does not act on the locking ball 13 or the locking groove 27. Therefore, the groove wall of the lock groove is not gouged out by the pressing force of the lock ball, as has been the case in the past. In addition, the force that tries to separate the connected socket and plug becomes smaller, and as a result, when a large force is no longer applied between the locking ball 13 and the locking groove 27, the front body of the socket is removed in order to reduce wear. There is no need to heat-treat the plug body 26 or the plug body 26, which contributes to cost reduction by the amount of heat treatment omitted.

Furthermore, the present invention does not seal the outer peripheral surface of the tip of the plug 25, but rather seals the plug 2 through the guide tube 3.
Since the inner surface of the plug is sealed, there is no need to highly precisely polish the outer circumferential surface of the plug body, which is prone to scratches, and even if the plug is dropped and the outer circumferential surface of the plug is damaged, The sealing properties of the plug are not impaired at all by the scratches. Therefore, you don't have to be as careful as you would be when handling conventional products, which is combined with the above-mentioned effects of improved seal durability, improved ease of attachment and detachment, and cost reduction due to no need for heat treatment. , The practicality of this invention is extremely high.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view of a socket cut in four halves, and Fig. 2 is a front view of a plug cut in four halves. 2 is a valve seat, 3 is a guide tube, 4 is a valve body, 10 is a front body, 12 is a tapered hole, 13 is a lock ball, 2
0 is a sleeve, 22 is a socket, 25 is a plug,
Reference numeral 27 denotes a locking groove, 28 denotes an inner peripheral surface of the tip, 30 denotes a seal ring, 31 denotes a locking portion, 32 denotes a valve seat, and 33 denotes a valve body.

Claims (1)

[Scope of utility model registration request] A socket 22 constitutes a main body portion by a front body 10 equipped with a ball 13 as a locking element of a locking mechanism such as a ball lock type, and a rear body 1 equipped with a valve body 4 in a fluid passage, and a socket 22 that engages the locking element 13. A locking groove 27 is provided on the outer periphery, and a valve body 3 is provided in the fluid passage.
3, and when the two valve bodies 4 and 25 are connected by the locking mechanism, the valve bodies 4 and 33 press against each other and open the fluid passage together. 25
A groove 29 is provided in the circumferential direction on the inner circumferential surface of the tip end, and a seal ring 30 is fitted into the groove. , a high-pressure pipe joint provided with a guide cylinder 3 whose outer peripheral surface is sealed by the seal ring 30 within the socket 22.