JP2004204887A - Coupling for fluid pressure equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact coupling for fluid pressure equipment capable of easily carrying out air-bleeding in the fluid pressure equipment without conducting troublesome operation. <P>SOLUTION: A single housing 21 comprises a port connecting part 12 for being fixed to a supply/exhaust port of the fluid pressure equipment, a pipe connecting part 13 for connecting a pipe which supplies or exhausts fluid to/from the fluid pressure equipment, an air-bleeding port 14 for letting air inside the fluid pressure equipment out, a main channel 15 bent in an L shape for communicating the port connecting part 12 and the pipe connecting part 13, air-bleeding channels 16a, 16b diverging from the main channel 15 and communicating with the air-bleeding port 14, a valve element 18 and a valve seat 17 intervening in the air-bleeding channels 16a, 16b, and a valve guard 19 for pressing the valve element 18 to the valve seat 17. The main channel 15 and the air-bleeding port 14 are communicated through the air-bleeding channels 16a, 16b only when the valve element 18 separates from the valve seat 17 by operation of the valve guard 19. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hydraulic device coupling used for a hydraulic device requiring air bleeding.
[0002]
[Prior art]
For example, in the case of hydraulic cylinders that use hydraulic fluid as the working fluid, when performing an operation test before shipping, and before operation after installation, work to remove air from the hydraulic cylinder and the connection piping to the outside of the system must be performed. This is usually done. If the air bleeding is insufficient, the operation of the piston becomes unstable.
[0003]
In order to prevent this, air bleeding work has been performed by removing the connection between the joint attached to the port of the hydraulic cylinder and the piping for supplying and discharging hydraulic oil, or by installing it on the cylinder cover of the hydraulic cylinder. The air was released by loosening the cushion adjustment valve and check valve. In some cases, the cushion adjusting valve or the like is removed and air is removed, and then the cushion adjusting valve or the like is attached again.
[0004]
Conventionally, an air release valve has been used as a piping component (for example, see Non-Patent Document 1). Therefore, as shown in FIG. 5, for example, it is conceivable to connect the air bleeding valve 8 to the cheese 9 with the pipe joint and attach this to the supply / discharge port of the hydraulic cylinder to bleed the air.
[0005]
[Non-patent document 1]
Ihara Science Co., Ltd. “Product Guide”, [online], [searched on November 15, 2001], Internet <URL: http: // www. ihara-sc. co. jp / catalog / ne / >>
[0006]
[Problems to be solved by the invention]
However, the method of removing air by removing the connection between the joint attached to the port of the hydraulic cylinder and the piping for supplying / discharging the pressure oil requires a great deal of labor for air removal.
[0007]
In the method of bleeding air by loosening the cushion adjustment valve, etc., it takes a long time to bleed the air because the clearance of the valve is small, while pressure oil blows out from the cushion adjustment valve, etc. at the final stage of bleeding Dirty around the hydraulic cylinder. In addition, in the method of once removing the cushion adjustment valve or the like to perform air bleeding, air tends to be mixed when the cushion adjustment valve is attached again.
[0008]
Further, in these methods, the work may not be easy depending on the position of the port, the arrangement of the hydraulic cylinder, or the like, or the air bleeding itself may be inadequate in some cases.
[0009]
In the method of using the air bleed valve 8 and the cheese 9 with the pipe joint in combination, since these lengths are large and not compact, a large projection projects from the hydraulic cylinder. Therefore, workability in the vicinity thereof is deteriorated, and there is a high possibility that a tool or a conveyed object collides with the protruding portion to cause oil leakage. In addition, since a large space is required for installing the hydraulic cylinder, there is also a problem that it is difficult to adopt this method when it has to be installed in a limited space where there is no room.
[0010]
The present invention has been made in view of the above-described problems, and provides a compact joint for a fluid pressure device that can easily perform air bleeding in a fluid pressure device without particularly complicated work. Aim.
[0011]
[Means for Solving the Problems]
A joint for a hydraulic device according to the present invention connects a port connecting portion for attaching to a supply / discharge port of a hydraulic device, and a pipe for supplying a fluid to the hydraulic device or discharging a fluid from the hydraulic device. A pipe connection portion, an air vent port for releasing air inside the fluid pressure device to the outside, and a main flow passage that bends and communicates the port connection portion and the pipe connection portion into an L shape. An air vent channel branched from the main channel to communicate with the air vent port, a valve element and a valve seat provided in the middle of the air vent channel, and a valve for pressing the valve element against the valve seat The main channel and the air vent port communicate with each other through the air vent channel only when the valve body is separated from the valve seat by the operation of the valve retainer. I do.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
1 is a front sectional view of a joint 1 according to a first embodiment of the present invention, FIG. 2 is a plan sectional view of the joint 1 of FIG. 1, and FIG. 3 is a front view of a joint 1B of a second embodiment according to the present invention. Sectional drawing, FIG. 4: is front sectional drawing of 1 C of couplings of 3rd Embodiment concerning this invention.
[0013]
In FIG. 1, a joint 1 forms a housing 21, a port connection portion 12, a pipe connection portion 13, an air discharge port 14, a working fluid flow path 15 inside the housing 21, air flow paths 16 a and 16 b, and a valve. It comprises a valve seat 17, a ball 18, a ball holder 19, a valve rod 20 and a handle 22.
[0014]
The port connection portion 12 is a male screw with a taper, and is screwed and attached to a female screw with a taper of a fluid suction port or a discharge port of a fluid pressure cylinder using a hydraulic fluid or water as a working fluid, a diaphragm pump, a plunger pump, or the like. It is formed as follows.
[0015]
The pipe connection part 13 is a part connected to a pipe for supplying / discharging the working fluid to the fluid pressure device, and is formed by a recessed pipe joint. By using a bite type pipe joint, the joint 1 and the pipe can be easily connected and separated.
[0016]
As shown in FIG. 2, the air discharge port 14 is provided at a position on the opposite side of the housing 21 with respect to the pipe connection portion 13, that is, at a position rotated by 180 degrees around the center of the port connection portion 12. In addition, in order to cope with an installation state such as a place where the installed fluid pressure device and other peripheral devices and supply and discharge pipes of the pressure fluid are connected, the air is placed at a position of 90 degrees or 270 degrees with respect to the pipe connection portion 13. A discharge port 14 may be provided. The air discharge port 14 corresponds to the air release port in the present invention.
[0017]
The air discharge port 14 is provided with a female thread so that a hose neck convenient for connecting a vinyl tube or a rubber tube can be attached. By attaching a vinyl tube or the like to the air discharge port 14, air can be discharged to an appropriate place, and at the same time, contamination around the hydraulic equipment due to blowing of pressure oil can be prevented. Note that a hose neck may be provided integrally with the air discharge port 14.
[0018]
The channel 15 corresponds to the main channel in the present invention. The flow path 15 is configured such that a straight port-side flow path 151 coaxially communicating with the port connection part 12 and a straight pipe-side flow path 152 coaxially communicating with the pipe connection part 13 are orthogonal to each other. It is formed to be bent into an L shape. The flow path 15 allows the port connection part 12 and the pipe connection part 13 to communicate with each other.
[0019]
The air passages 16a and 16b correspond to the air vent passage in the present invention. The air flow path 16 b is provided so as to branch off from the flow path 15 on the extension of the port-side flow path 151. The above-described valve seat 17 and ball 18 are provided in the air flow path 16b. The ball 18 is pressed against the valve seat 17 by the ball retainer 19 at the tip of the valve rod 20 except when the air is released, and closes the air flow path 16b. The operation of the handle 22 moves the valve stem 20, which opens and closes the valve, thereby opening and closing the air flow path 16b. The air flow path 16 a is provided orthogonal to the air flow path 16 b and communicates with the air discharge port 14.
[0020]
The housing 21 is integrally formed by casting and / or machining using a metal material. As shown in FIG. 2, two flat surfaces parallel to each other are provided on the surface of the housing 21 so that the housing 21 can be easily screwed into a port of the fluid pressure device with a wrench or the like. In addition, by making the cross-sectional shape of a part of the housing hexagonal, it is possible to further easily attach the housing to the fluid device by using a tool.
[0021]
The joint 1 of the present embodiment is preferably attached to the fluid pressure device such that the handle 22 is positioned upward in FIG. 1, that is, the branch portion of the air flow path 16b is at the highest position.
[0022]
The joint 1B of the second embodiment shown in FIG. 3 uses a valve stem 20B having a hexagonal-headed head in order to make the joint 1 of FIG. 1 more compact.
With such a configuration, the air vent valve 8 and the cheese 9 with the pipe joint shown in FIG. Therefore, it is possible to avoid the danger of the collision of the conveyed object and the leakage of the pressure oil due to the collision of the conveyed object without deteriorating the workability in the vicinity.
[0023]
In the third embodiment shown in FIG. 4, unlike the first and second embodiments, the branch of the air flow path 16Cb is provided on an extension of the pipe-side flow path 152 starting from the pipe connection portion 13C. Depending on the port position of the fluid pressure device and the mounting direction of the fluid pressure device, when the pressurized fluid flows horizontally from the port to the joint 1C, such a configuration is adopted, so that even a small part of the flow path 15C is placed in the vertical direction. A higher position can be a branch portion to the air flow path 16Cb, and more complete air bleeding can be performed.
[0024]
In the above embodiment, a disc type, a needle type, or the like can be used as the valve body. The valve stem can be moved by various methods such as a handle type which is directly touched and rotated by hand as shown in FIGS. 1 and 4, a type which is rotated with a hexagon wrench as shown in FIG. Formats can be used.
[0025]
Further, the method of attaching the joint to the port of the fluid pressure device is not limited to screwing, and it may be attached by a union or by bolting with a flange.
[0026]
These embodiments add the air release valve function to the joint used for the fluid pressure device while maintaining the compactness of the conventional joint, and, among the flow paths of the pressurized fluid inside the joint, to the fluid pressure device. When attached, a branch of the air flow path for air release is provided at the highest position in the vertical direction to ensure the air release.
[0027]
Therefore, in the above-described embodiment, the form, structure, shape, number, and the like of the housing, valve body, valve seat, valve stem, valve retainer, port connection portion, pipe connection portion, and the like are appropriately determined according to the spirit of the present invention. Can be changed. Further, an optimum material can be appropriately selected and used depending on the properties of the pressurized fluid.
[0028]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the joint for hydraulic equipment compact which can perform air bleeding easily in hydraulic equipment easily without performing complicated work can be provided.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a joint according to a first embodiment of the present invention.
FIG. 2 is a plan sectional view of the joint of FIG. 1;
FIG. 3 is a front sectional view of a joint according to a second embodiment of the present invention.
FIG. 4 is a front sectional view of a joint according to a third embodiment of the present invention.
FIG. 5 is a front sectional view in which a conventionally used air release valve and a cheese with a joint are combined.
[Explanation of symbols]
1,1B, 1C Fittings (Fluid pressure equipment fittings)
12, 12B, 12C Port connection parts 13, 13B, 13C Pipe connection parts 14, 14B, 14C Air release port (air release port)
15, 15B, 15C Channel (Main channel)
16a, 16b, 16Ba, 16Bb, 16Ca, 16Cb Air flow path (air release flow path)
17, 17B, 17C Valve seat 18, 18B, 18C Ball (valve element)
19, 19B, 19C Ball retainer (valve retainer)
21, 21B, 21C Housing 151 Port-side flow path 152 Pipe-side flow path

Claims (3)

A port connection portion for attaching to a supply / discharge port of a fluid pressure device,
A pipe connection unit for connecting a pipe that supplies a fluid to the fluid pressure device or discharges a fluid from the fluid pressure device,
An air vent port for discharging air inside the fluid pressure device to the outside,
A main flow path that bends and communicates the port connection part and the pipe connection part into an L shape;
An air vent channel that branches off from the main channel and communicates with the air vent port;
A valve element and a valve seat provided in the middle of the air vent channel,
A valve press for pressing the valve body against the valve seat;
Are provided in one housing,
Only when the valve element is separated from the valve seat by the operation of the valve press, the main flow path and the air release port communicate with each other via the air release flow path,
A coupling for a fluid pressure device, characterized in that: The air vent channel branches off from the main channel on an extension of one linear portion of the main channel, bends into an L shape, and communicates with the air vent port.
The joint for a hydraulic device according to claim 1. A port connection for attaching to a supply / discharge port of a hydraulic device, a piping connection for connecting a pipe for supplying a fluid to the hydraulic device or discharging a fluid from the hydraulic device, and the port connection And a main flow path that communicates with the pipe connection portion is a fluid pressure device coupling provided in the housing,
The main flow path is configured such that a straight port-side flow path coaxially communicating with the port connection part and a straight pipe-side flow path coaxially communication with the pipe connection part are substantially orthogonal to each other. It is formed by bending into an L shape,
An air vent channel branched from the main channel on an extension of the port-side channel,
An air vent port provided on the opposite surface of the housing with respect to the pipe connection portion and communicating with the air vent channel;
A valve element and a valve seat provided in the middle of the air vent channel, for opening and closing the channel by operating a valve press,
Are provided integrally with the housing,
A coupling for a fluid pressure device, characterized in that:

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