JPH0410475Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention consists of an inlet side member that is attached to a pressure port on the high pressure side of a base body such as a gear valve, and an outlet side member that is attached to a return port on the low pressure side. This invention relates to a piping connection device.

The present invention can be used, for example, in a piping connection device for connecting a pipe to a return port and a pressure port of a gear valve, compressor, hydraulic pump, etc.

[Prior Art] A piping connection device, for example, a piping connection device for connecting a pipe to a return port on the low pressure side and a pressure port on the high pressure side of the base of a gear valve, is as follows:
Inlet side member A attached to pressure port
and outlet side member B attached to the return port.
It is made up of. Here, both the inlet side member A and the outlet side member B include the pressure port 101 of the base body 100, as shown in FIGS.
Internal threaded portion 101 formed in return port 102
Bolt union 200 screwed into a, 102a
, an eye union 300 through which the bolt union 200 passes, and a seal member 400 that seals both end surfaces of the eye union 300. Here, the bolt union 200 has a fluid passage hole 200a communicating with the pressure port 101 and the return port 102. iUnion 300 is
Fluid inflow pipe 500, fluid outflow pipe 600, and fluid passage hole 200a of bolt union 200
It has a hollow chamber 300a communicating with.

The high-pressure fluid supplied from the fluid inflow pipe 500 is supplied to the eye union 300 of the inlet side member A.
The fluid is supplied into the gear valve through the hollow chamber 300a of the bolt union 200, the fluid passage hole 200a of the bolt union 200, and the pressure port 101. On the other hand, the low-pressure fluid discharged from the return port 102 of the gear valve passes through the fluid passage hole 200a of the bolt union 200 of the outlet side member B, the hollow chamber 300a of the eye union 300, and is discharged from the fluid outflow pipe 600.

By the way, in the gear valve, return port 10
Since the pitch L between ports 2 and pressure port 101 is short, piping is not easy. Therefore, as shown in FIG.
setting, and the axis center X2 of the return port 102
It was necessary to set the axis Y2 of the female threaded portion 102a on the outer side. This is the first measure.
Furthermore, as a second measure, the mutually opposing portions of the eye unions 300 of the entrance side member A and the exit side member B are subjected to cutting or the like to form a cutout portion 300c. Interference between the eye unions 300 is avoided by the first and second measures.

However, in the above configuration, pressure port 1
01 axis X1, return port 102 axis X1
Be sure to insert the female thread part 101 in a position shifted from 2.
a. A female threaded portion 102a must be formed. Further, in the above configuration in which the cutout portion 300c is formed, the eye union 30 in which the cutout portion 300c is formed
The wall thickness of the 0 part becomes thinner. Therefore, the bolt union 200 is attached to the female threaded portion 101a of the pressure port 101 and the female threaded portion 1 of the return port 102.
When tightening to 02a, there is a possibility that the cutout part 300c will break, which is disadvantageous in terms of strength.

Moreover, in the above configuration, in addition to forming the female threaded portion 102a in the return port 102, it is also necessary to form the female threaded portion 101a in the pressure port 101.

[Problems to be solved by the invention] The present invention was created in view of the above-mentioned circumstances, and its purpose is to provide an advantage in terms of strength, and to provide a pressure port that only needs to have a female threaded portion. To provide a piping connection device that does not require shifting the axis of a seam screw part from the axis of a pressure port.

[Means for Solving the Problems] The piping connection device according to the present invention is composed of an inlet side member attached to a pressure port of a base such as a gear valve, and an outlet side member attached to a return port, and the inlet side member The bolt union has a fluid passage hole communicating with the pressure port inside and is screwed into the internal threaded part formed in the pressure port, and the bolt union passes through and is held by the base body, and the bolt union is connected to the fluid inflow pipe and the bolt union. An eye union having a hollow chamber communicating with a fluid passage hole of the eye union, and a first sealing member sealing both end surfaces of the eye union, and the outlet side member connects the bolt union and the eye of the inlet side member. a union, a tubular joint portion integrally fixed to at least one of the first seal members and having a shaft hole, and a second seal member provided on the outer peripheral surface of the joint portion and abutting the inner wall surface of the return port. It is characterized by being composed of.

Brazing, welding, bonding with adhesive, etc. can be used as a means for integrally fixing. Note that the first seal member is preferably made of copper.

[Embodiment] FIG. 1 shows a first embodiment in which the present invention is applied to a gear valve piping connection device.

The piping connection device according to this embodiment includes an inlet side member 2 attached to a pressure port 10 on the high pressure side of a base body 1 of a gear valve, and an outlet side member 3 attached to a return port 11 on the low pressure side. The inlet side member 2 is composed of a bolt union 20, an eye union 21, and first seal members 22 and 23. The bolt union 20 consists of a head portion 20b and a shaft portion 20c. The shaft portion 20c of the bolt union 20 has a fluid passage hole 20a that communicates with the pressure port 10, and a male thread portion 20d that is screwed into the female thread portion 10a formed in the pressure port 10. The fluid passage hole 20a is
It opens at the tip of the shaft portion 20c and at the peripheral end of the shaft portion 20c. The eye union 21 has a hole 21b in the upper wall and a hole 21c in the lower wall. This hole 2
Shaft part 20c of bolt union 20 to 1b, 21c
By inserting the eye union 21 into the base body 1, the eye union 21 is held by the base body 1. The eye union 21 has a hollow chamber 21a that communicates with the fluid inlet pipe 4 connected to the pump and the fluid passage hole 20a of the bolt union 20. First seal members 22 and 23
is made from copper. first seal member 22,
23 is applied to the upper wall and lower wall of the eye union 21, and therefore the eye union 21
Both end faces are sealed. When the head 20b of the bolt union 20 is turned and the threaded portion 21d is screwed into the female threaded portion 10a of the pressure port 10, the first seal members 22 and 23 are compressed and deformed. Therefore, the hole 21b of the eye union 21 and the hole 21
Fluid leakage from c can be suppressed.

On the other hand, the outlet side member 3 includes a tubular joint part 30 that is fitted into the return port 11 on the low pressure side and communicates with the fluid outflow pipe 5, and a tubular joint part 30 that is provided on the outer peripheral surface of the joint part 30 to prevent fluid leakage from the return port 11. A second seal member 31 made of rubber suppresses the Here, the joint part 30 is connected to the bracket 32
has. The bracket 32 has a cylindrical portion 32a and a flange portion 3.
2b. The cylindrical portion 32a is brazed and integrally fixed to the joint portion 30. Also, flange part 32b
is brazed to the eye union 21 and fixed integrally therewith.

Note that after fitting the joint part 30 to the return port 11, the flange part 32b of the bracket 32 may be brazed to the eye union 21, or
Attach the flange 32b of the bracket 32 to the eye union 21.
After brazing, the joint portion 30 may be fitted into the return port 11.

In this embodiment described above, the female threaded portion 10a is formed only in the pressure port 10 where the fluid pressure is high, and the male threaded portion 2 of the bolt union 20 is formed in the female threaded portion 10a.
0d to ensure piping to the pressure port 10 on the high pressure side. On the other hand, the return port 11 with low fluid pressure is not formed with a female thread, but the joint part 30 is inserted therethrough, and the joint part 30 and the eye union 21 are fixed together. is at low pressure, so
Piping like the one above is sufficient.

In this embodiment having the above configuration, unlike the conventional example shown in FIGS. 5 and 6 in which both the entrance side member and the exit side member have eye unions, there is no need to form a cutout in the eye union 21. Compared to the conventional model shown in Figures 5 and 6, the Eye Union 2
1 strength can be ensured. Therefore, even if the bolt union 20 is overtightened, damage to the eye union 21 can be suppressed.

In addition, in this embodiment, since the eye union 21 is provided only on the inlet side member 2, even when the distance between the return port 11 and the pressure port 10 is short, the eye union 21 is offset from the axial center of the pressure port 10 and the female thread is inserted. The portion 10a may not be formed. This differs from the conventional method in which the female threaded portions 101a and 102a must be formed with their axes offset.

Furthermore, in this embodiment, it is sufficient to form the female threaded portion 10a in the pressure port 10, and unlike the conventional case, the return port 11 only needs to be a normal hole into which the joint portion 30 is fitted. Since it is not necessary to form the same, the manufacturing process can be made easier.

Furthermore, in the embodiment described above, if the shaft portion 20c of the bolt union 20 is turned and the threaded portion 20d is screwed into the female threaded portion 10a of the pressure port 10, the amount of entry of the joint portion 30 of the outlet side member 3 into the return port 11 is reduced. It has the advantage of being able to increase

FIG. 2 shows a second embodiment of the invention. The second embodiment basically has the same configuration as the first embodiment described above. However, a copper seal member 24 is provided,
The difference is that an opening 32c is formed in the flange 32b of the bracket 32 that is brazed to the joint 30 of the outlet side member 3. Then, by inserting the shaft portion 20c of the two bolt unions into the opening 32c and screwing the bolt union 20 into the female threaded portion 10a, the sealing member 24 and the sealing member 22 are attached to the bracket 32.
The flange 32b of the outlet side member 3 is compressed.
A bracket 32 is integrally fixed to the bolt union 20 of the inlet side member 2. The second embodiment configured in this manner also provides the same effects as the first embodiment.

3 and 4 show a third embodiment of the invention. The third embodiment has basically the same configuration as the first embodiment described above. However, the eye union 26 of the entrance side member 2 is a recessed portion 26 having a circular cross-sectional wall surface.
It has a. This recessed portion 26a fits into a joint portion 30, which is a cylindrical body having an outer peripheral surface with a circular cross section. And the wall surface of the recessed part 26a of the entrance side member 2,
The outer peripheral surface of the joint portion 30 of the outlet side member 3 is integrally fixed by brazing. In the third embodiment, a recess 26a (corresponding to the conventional cutout 300c) is formed in the eye union 26, but the recess 26a is brazed and integrally fixed to the joint 30. , the portion of the eye union 26 having the recessed portion 26a is reinforced. Therefore, the decrease in strength due to the formation of the recessed portion 26a can be compensated for. The third embodiment is suitable when the pitch between the pressure port 10 and the return port 11 is extremely small.

[Effects of the Invention] As is clear from the above description, the present invention can ensure the strength of the eye union compared to the conventional art shown in FIGS. 5 and 6. Therefore, even if the bolt union is over-tightened, damage to the eye union can be suppressed.

Furthermore, with this invention, it is sufficient to provide the eye union only on the inlet side member, so even if the pitch between the pressure port and the return port is small, the axis of the pressure port and the female thread part can be aligned. You can also do it. At this point, the axis X1 of the pressure port 101, the return port 10
Be sure to shift the female thread part 1 with respect to the axis X2 of 2.
This is different from the conventional method in which it was necessary to form 01a and 102a. In addition, in the present invention, the female threaded portion can be formed at a position slightly offset from the axis, if necessary.

Furthermore, with the present invention, it is sufficient to form a female thread in the pressure port, and unlike conventional methods, the return port only needs to have the shape of a normal hole into which the joint part is fitted, and there is no need to form a female thread. , the manufacturing process can be made easier accordingly.

[Brief explanation of the drawing]

1 to 4 show each embodiment of the present invention, FIG. 1 is a longitudinal cross-sectional side view of the piping connection device according to the first embodiment, and FIG. 2 is a longitudinal sectional side view of the pipe connection device according to the second embodiment of the present invention 3 is a longitudinal sectional side view of a piping connection device according to a third embodiment of the present invention, and FIG. 4 is a plan view taken from the - line in FIG. 3. be. FIGS. 5 and 6 show a conventional technique, with FIG. 5 being a longitudinal sectional side view of a conventional piping connection device, and FIG. 6 being a plan view thereof. In the figure, 1 is the base, 10 is the pressure port, 1
1 is a return port, 2 is an inlet side member, 20 is a bolt union, 21 is an eye union, 22 and 23 are first seal members, 20a is a fluid passage hole, 2
1a is a hollow chamber, 3 is an outlet side member, 30 is a joint part,
31 is a second seal member, 32 is a bracket, 32
a indicates a cylinder portion, and 32b indicates a flange portion.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of an inlet side member attached to a pressure port of a base body such as a gear valve, and an outlet side member attached to a return port, the inlet side member internally communicates with the pressure port. a bolt union having a fluid passage hole formed in the pressure port and screwed into the internal threaded portion, and a hollow hole through which the bolt union passes and is held by the base body and communicates with the fluid inflow pipe and the fluid passage hole of the bolt union. It is composed of an eye union having a chamber and a first sealing member that seals both end surfaces of the eye union, and the outlet side member is configured to connect the bolt union of the entrance side member, the eye union, and the first sealing member to each other. A piping connection device comprising a tubular joint portion integrally fixed to at least one side and having a shaft hole, and a second seal member provided on the outer peripheral surface of the joint portion and abutting the inner wall surface of the return port. . (2) The joint part of the outlet member has a bracket with a through hole, and the bolt union of the inlet side member is inserted into the through hole so that the bolt union is integrally fixed to the bolt union. range 1
Piping connection device as described in section. (3) The piping connection device according to claim 1, wherein the joint portion of the outlet side member has a bracket, and the bracket is integrally fixed to the eye union of the inlet side member. (4) The joint part of the outlet side member is a cylindrical body having an outer circumferential surface with a circular cross section, and the inlet side member eye union has a wall surface with a circular cross section into which the outer circumferential surface of the cylindrical body fits. The piping connection device according to claim 1, which has a recessed portion, and wherein the wall surface of the recessed portion and the outer circumferential surface of the cylindrical body are integrally fixed.