JPH0438953B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a joint fitting that performs sealing using a mating seal seat, or an attached fitting such as an adapter (hereinafter, these fittings and attached fittings are respectively referred to as joint members). In particular, the present invention relates to a joint member whose seal seat can be replaced depending on the seal seat of the partner to be connected.

[Conventional technology]

Conventionally, coupling members used in hydraulic devices or hydraulic circuits using high-pressure fluids such as hydraulic oil are specified, for example, in Japanese Industrial Standard B8263 "Hydraulic Hose Assembly Couplings and Attachments." Taking as an example a "female threaded male seat union joint for pipes" as this kind of joint member, its structure is such that a hose connection part consisting of a nipple part and a socket is provided at one end of the intermediate wrench hook part of the joint body, and the other end is The part is provided with a threaded joint consisting of a truncated conical sliding seal seat whose diameter decreases toward the tip, and a union nut that is hooked at the step between the sliding seal seat and the wrench hook. It is becoming.

When such a joint member is connected to another joint member (in this case, a threaded joint consisting of a male thread such as a male threaded joint or a male adapter), the tapered surface of the union nut becomes the sealing surface, and the tapered surface When the union nut is tightened, the union nut comes into contact with the reverse tapered surface (sealing surface) formed on the inner peripheral surface of the tip of the threaded joint (male thread) of the other joint member to be connected, and the metal sliding surfaces are brought into contact with each other. It exhibits a sealing effect upon contact. Note that this sealing effect is the same in combinations of the various joint members described above.

[Problem to be solved by the invention]

In these joint members, the angle of the tapered sealing surface is not defined as one type, but a plurality of angles are adopted. Since sealing cannot be achieved unless the angles of the sealing surfaces match, if the angles of the sealing surfaces of the mating joint members already attached to the device are different,
Either the hose assembly with the fitting member installed cannot be used and is wasted, or it may be necessary to use an adapter to connect another fitting member with a matching sealing surface angle. It was expensive and lacked flexibility.

Therefore, in view of these problems of the prior art, an object of the present invention is to provide a joint member in which the sliding seal seat can be changed.

[Means to solve the problem]

In order to achieve the above-mentioned object of the present invention, according to the present invention, the threaded joints provided on the outer peripheral surface of the joint body are connected to each other, so that the sliding seal seats on the end faces of the joint body are brought into contact with each other and sealed. In the joint member to be held in place, the sliding seal seat has a cylindrical body having a bulge formed on a seal surface with a tapered peripheral surface on one end side, and a rear surface of the bulge and a back surface of the bulge are formed on the end surface of the joint body. It is characterized by being removably inserted through a seal ring between the two.

[Effect]

In the joint member of the present invention, the sliding seal seat formed in a cylindrical shape separate from the joint body is inserted into the end face portion of the joint body through the seal ring, and the sliding seal seat is mated with the joint body by the seal ring. The seal between the two is maintained.

In this case, since the seal ring is provided between the back surface of the bulge with a sealing surface formed on the tip side and the end face of the joint body, the seal ring is provided between the inner peripheral surface of the joint body at the part where the sliding seal seat is inserted. The gap between the cylindrical mating seal seat and the outer circumferential surface may be small, and therefore, after insertion, there are almost no steps on the inner surface of the flow path that can cause liquid accumulation or pressure loss. In addition, when combined with a mating joint member, the axes of the sliding seal seats made as separate parts are held on the same straight line by the fitting of the tapered surfaces, so the area near the joint between the sliding seal seats It is difficult for a step to occur on the inner circumferential surface.

Furthermore, since the mating seal seat is formed separately from the joint body and can be removed, if the angle of the mating seal seat of the mating joint member to be connected does not match, you can use several types of mating seal seats made in advance. All you have to do is select a matching seal seat from among the seal seats and replace it.
This eliminates the need to rebuild the hose assembly or to include an adapter.

〔Example〕

FIG. 1 is a partial longitudinal sectional side view showing one embodiment of a joint member according to the present invention. This figure shows a state in which a hose 30 is coupled to a union joint 1 as one coupling member that is coupled to an adapter 20 as the other coupling member.

In the union joint 1, which is one of the joint members, a cylindrical sliding seal seat 3 is provided at one end of the joint body 2 with a truncated conical bulge 3b whose outer peripheral surface 3a serves as a sealing surface. It is fitted into the flow path 2a from the end surface 2b side of the joint body 2, leaving a bulge 3b. Here, a seal ring 4 is fitted into the annular groove provided on the back surface of the bulging portion 3b of the mating seal seat 3, and this seal ring 4 is connected to the end surface 2b of the joint body 2 by coupling with an adapter 20, which will be described later. By being squeezed, airtightness between the two is maintained. Note that the flow path on the terminal side of the joint body 2 that fits with this mating seal seat 3 is as follows:
The wall thickness of the fitting portion 3c of the mating seal seat 3 is formed to be larger than the other portions, so that there is no difference in level between the inner circumferential surfaces of both members in the fitted state. Furthermore, the mating seal seat 3 of the joint body 2
A step portion 2c is provided on the outer circumferential surface of the portion that is fitted with the union nut 5, which serves as a screw connection portion and has a female thread portion 5a for connection with the other joint member, in the step portion 2c. It is hung at the same axis as the joint body 2. On the other hand, the other end includes a nipple part 2d that is inserted into the hose 30, and a cylindrical part that is arranged concentrically on the outside of the nipple part 2d with an annular space in between and is fixed to the joint body 2 at its base. Hose coupling part 7 consisting of socket 6
The structure has been set up.

When connecting the union joint 1, which is one joint member of the above configuration, to the adapter 20, which is the other joint member, and the hose 30, the hose 3
0 into the annular space between the nipple portion 2d of the union joint 1 and the socket 6, and then pressurizes the socket 6 from the outside to tighten it. As a result, the tip of the hose 30 is compressed by the diameter-reduced socket 6, and the uneven portion 2e formed on the outer peripheral surface of the nipple portion 2d and the uneven portion 6a formed on the inner peripheral surface of the socket 6 are respectively compressed. The inner circumferential surface and the outer circumferential surface are joined in a state where they are bitten, resulting in a connection structure that ensures sufficient pull-out strength. In this case, for example, as proposed by the present applicant (Utility Model Application Publication No. 186892/1989), the hose has an inner diameter substantially equal to the inner diameter of the nipple portion 2d of the union joint 1, and is inserted into the nipple portion 2d in advance. Either enlarge the end of the nipple part 2d until it reaches the possible inner diameter, or connect the tip of the nipple part 2d to the hose 3, as similarly filed by the applicant in Japanese Utility Model Application Publication No. 194992/1983.
By biting into the inner circumferential surface of the hose connection portion, there will be substantially no difference in level on the inner circumferential surface of the hose connection portion, which is advantageous.

Next, to connect the union joint 1 and the adapter 20, connect the male threaded part 21a as a threaded joint provided at one end of the joint body 21 of the adapter 20 to the female threaded part 5a of the threaded joint of the union joint 1. This is done by screwing together. An opposite tapered surface (sealing surface) 21b that fits into the tapered surface 3a of the mating seal seat 3 of the union joint 1 is formed on the end face of one end of the adapter 20, forming a mating seal seat. And the female thread part 5
The sealing surface 3a,
21b are brought into contact with each other, and the airtightness between the two is reliably maintained. Here, the mating seal seat 3 of the union joint 1, which is made as a separate part, is attached to the adapter 20.
Since the axial center is stabilized by being guided by the tapered surface 21b of the flow path, there will be no step portion on the inner circumferential surface of the flow path.

By the way, if the angle of the sealing surface 21b of the adapter 20 and the angle of the sealing surface 3a of the union joint 1 are different, replace the mating seal seat 3 of the union joint 1 with another mating seal seat that matches the sealing surface 21b of the adapter 20. This eliminates the need to connect another union joint using an adapter or the like, or to remake the hose assembly, which is extremely economical.

Although the sliding seal seat 3 of the joint member 1 in the embodiment is shown as a male seat surface in which the outer side of the cylindrical body is tapered, it may of course be a female seat surface.

〔Effect of the invention〕

As explained above, according to the present invention, in a joint member having a tapered mating seal seat, the mating seal seat is formed into a cylindrical shape separate from the joint body, and this mating seal seat is attached to the joint body. Since it is configured to be removably inserted into the end face via a seal ring between the end face and the end face, if the angle of the seal face does not match the seal seat of the mating joint member to be connected, it is necessary to align it. Connection can be made by replacing only the seal seat. Therefore, there is no need to go through the troublesome and costly process of using extra parts to connect fittings that do not fit together, and there is no need to rebuild the hose assembly using matching fittings. It is extremely economical as there is no need for it.

Furthermore, since the mating seal seat is formed separately from the joint body, it has great practical effects, such as easier molding of the seal seat.

In addition, in the embodiment, explanation was given using a union joint as an example of a joint member, but the present invention may also be applied to joint fittings of other shapes such as a male threaded joint, or to attached fittings such as adapters and elbows. The shape of the joint body of these joint members can be selected as appropriate depending on the conditions of use and the like. In addition, in the coupling member of the embodiment, instead of the above-mentioned caulking method, the means for connecting with the hose may be a biting method as specified in Japanese Industrial Standard B2351, for example.
Alternatively, other systems may be used, and various modifications within the technical concept of the present invention are of course possible.

[Brief explanation of drawings]

FIG. 1 is a partial longitudinal sectional side view showing one embodiment of a joint member according to the present invention. 2, 21... Joint body, 3a, 21b... Seal surface, 3... Grinding seal seat, 4... Seal ring, 5, 21a... Threaded joint, 20, 40
……adapter.

Claims (1)

[Claims] 1. A joint member in which the sliding seal seats on the end faces of the joint body are brought into contact with each other and sealed and held by connecting threaded joints provided on the outer peripheral surface of the joint body, wherein the sliding seal seats have a tapered peripheral surface. The cylinder body has a bulge formed on the sealing surface of the cylindrical body on one end side, and is removably inserted between the end face of the joint body and the back surface of the bulge via a seal ring. A joint member characterized by: