JPH06307568A - Control valve, and orifice and check valve mounted on connection port thereof - Google Patents

Abstract

PURPOSE:To fix an orifice and a check valve to a valve body without applying particular processing, such as a screw processing, on the valve body of a control valve, an orifice, or a check valve and using an adhesive. CONSTITUTION:When an orifice 31 is mounted in a state to be fitted in a containing hole 27 formed in diameter larger than the diameter D1 of the port hole 26 of a control valve, the rear end face 31d thereof is situated approximately equal to or slightly deeper than a gasket mounting surface 21a. Thereby, the orifice 31 is fixed to a valve body 21 in a way that the mounting surface 8a of a mounting apparatus 8 is securely adhered on the gasket mounting surface side through a gasket in a state that an O-ring 28 is contained in a facing part 29 formed in diameter larger than that of the containing hole 27. Further, a check valve can be similarly mounted in the containing hole 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control valve used in a hydraulic circuit and a connection port of the control valve, which is provided with an orifice (throttle) for controlling shock, noise, or flow rate reduction during operation of hydraulic equipment. And a check valve that regulates the flow of fluid in one direction.

[0002]

2. Description of the Related Art Conventionally, a control valve used in such a hydraulic circuit and an orifice (connection port orifice) attached to a connection port of the control valve are, for example, as shown in FIG.
Alternatively, there is one as shown in FIG.

FIG. 5 shows an orifice 4 having a female screw portion 3 formed in a port hole 2 of a connection port formed in a valve body 1 of a control valve and a male screw portion 5 formed on an outer peripheral portion thereof.
Is screwed to a depth such that the position of the rear end surface 4a of the valve body 1 becomes a position spaced from the gasket mounting surface 1a of the valve body 1 by a predetermined distance, and then they are integrally fixed by an adhesive.

The gasket mounting surface 1a of the valve body 1
The O-ring 6 which is a seal member is attached to the spot facing portion 7 having a diameter larger than that of the port hole 2 formed in, and the attachment device 8 is attached to the gasket attachment surface 1a via a gasket (not shown). The surface 8a is contacted and fixed.

FIG. 6 shows an example of a top hat-shaped stepped orifice, in which a spot facing portion 11 formed on the inlet / outlet side of a port hole 2 formed in a valve body 1 of a control valve is provided with
An O-ring for sealing a top hat type orifice 12 in which a collar portion 12a having a thickness corresponding to the counterbore depth is formed on the entire circumference on the rear end side in the counterbore portion 11 of the control valve. 6 is fitted together, and they are sandwiched and fixedly held by the mounting surface 8a of the mounting device 8.

[0006]

However, in the case of a control valve having a connection port as shown in FIG. 5 and an orifice mounted therein, an orifice is provided in both the port hole of the control valve and the orifice. Since it was necessary to machine a screw to hold it in place, when using a control valve without mounting an orifice in the port hole, a valve body with an unnecessary female thread is used. ,
There was a case where it was wasted only for the screw processing.

Therefore, for such a case, it is possible to prepare two kinds of control valves, one having a threaded hole in the control port and the other having no threading in the port hole. It is not preferable because it is troublesome.
Further, the control valve and the orifice as described above are fixed to the valve main body by an adhesive agent in order to prevent the orifice from being loosened after the orifice is screwed into the port hole.
Alternatively, since the screw portion had to be a taper screw, there were problems that the parts replacement work was troublesome and the serviceability was poor.

Further, in the case of an orifice mounted on the control valve and its connecting port as shown in FIG. 6, all the force generated by the pressure difference across the orifice is received by the flange portion of the orifice. In the case of such a structure, it is difficult to obtain sufficient mechanical strength, and there is a problem that the range of use is limited to the case where the pressure difference before and after the orifice is not so large.

Therefore, in the case of the top hat type orifice shown in FIG. 6, the gasket mounting surface 1 of the control valve is
If the diameter of the port hole 9 on the side of the attachment device 8 to be attached to a is too large, the pressure acting on the rear end face 12b of the orifice becomes large and the strength of the flange 12a cannot withstand it. It is preferable to increase the hole diameter in order to reduce the pressure loss in consideration of the time when the orifice is not used, but there is a drawback that it cannot be increased so much.

Further, this top hat-shaped orifice 1
In the case of No. 2, since the O-ring 6 for sealing is arranged outside the flange 12a, the thickness t of the flange 12a is t.
Is limited by the thickness of the O-ring 6, and the collar 1
There was also a problem that 2a could not have a thickness sufficient to obtain a sufficient mechanical strength.

The present invention has been made in view of the above problems, and it is possible to replace the orifice or the check valve without special processing such as screwing on the valve body of the control valve and the orifice or the check valve. It has excellent serviceability that can be easily performed, and it requires no adhesive to secure the control valve and the orifice or the control valve and the check valve. The purpose of the present invention is to enable the device to be used even when the pressure difference between the front and rear is large, and to prevent the use range from being limited.

Further, it is necessary to prevent the mechanical strength of the orifice or the check valve from being affected by the seal member that seals between the control valve and the equipment to be attached to the control valve, and to provide sufficient space for the seal member. It also aims to be able to secure.

[0013]

In order to achieve the above object, the present invention has a port hole for communicating fluid with a connection port provided on a gasket mounting surface of a valve body for movably housing a valve body, A storage hole for mounting an orifice or check valve formed on the entrance side of the port hole with a diameter larger than that of the port hole, and a larger diameter than the storage hole on the gasket mounting surface side of the storage hole. A control valve is formed by forming a spot facing portion for accommodating a seal member.

Further, there is an orifice which is detachably mounted in the storage hole of the control valve and has a communication hole which communicates with the port hole of the control valve, and the length in the mounting direction of the rear end surface in the mounted state. The position should be approximately the same as or slightly deeper than the gasket mounting surface of the control valve, and the outer diameter of the portion corresponding to the counterbore part of the control valve should be fitted into the control hole. And an orifice formed to have a diameter smaller than the outer diameter and larger than the communication hole.

Further, the check valve is removably mounted in the storage hole of the control valve, has a communication hole communicating with the port hole of the control valve, and has a length in the mounting direction which is the rear end face in the mounted state. Position of the control valve is approximately the same as or slightly deeper than the gasket mounting surface of the control valve, and the outer diameter of the part corresponding to the counterbore part of the control valve is fitted into the control hole. There is also provided a check valve having a diameter smaller than the outer diameter of the portion and larger than the communication hole.

[0016]

According to the control valve and the orifice or the control valve and the check valve configured as described above, the orifice or the check valve is fitted into the storage hole formed in the control valve and has a diameter larger than the diameter of the port hole. If so, the position of the rear end surface will be approximately the same as or slightly deeper than the gasket mounting surface of the control valve.Therefore, seal on the spot facing part formed on the gasket mounting surface side with a diameter larger than the storage hole. If the mounting surface of the mounting device is closely attached and fixed with a gasket while the member is stored, the orifice or check valve can be screwed onto the valve body of the control valve, or adhesive can be used. Can be fixed without doing.

Further, since the orifice or the accommodating hole for accommodating the check valve is formed separately from the spot facing portion for accommodating the seal member, there is no restriction on the thickness of the seal member such as the O-ring. Since the storage hole can be deepened in the housing, the thickness of the orifice or check valve fitting part inserted there can be made thicker according to the depth of the storage hole. The force generated by the pressure difference can be received by the fitting portion with sufficient mechanical strength.

Further, in both the orifice and the check valve, the outer diameter of the portion corresponding to the counterbore part of the control valve is smaller than the outer diameter of the outer peripheral part fitted into the accommodation hole of the control valve. It is possible to secure a sufficient space for the seal member mounted on the boring portion.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an enlarged sectional view showing a state where an orifice is attached to a control valve showing one embodiment of the present invention, and an enlarged view of the vicinity of the attachment portion, and FIG. It is the schematic which simplifies and shows.

As shown in FIG. 2, the control valve 20 includes a valve body 2
A spool 22, which is a valve element, is movably housed in a sliding hole (not shown) formed in the horizontal direction in the drawing, and springs 23 are provided at both ends of the spool 22, respectively.
It is kept in a neutral position by 23. In addition, the valve body 21
Solenoids 24A and 24B are provided on both sides of the spool, and by operating them, the position of the spool 22 is moved.

The gasket mounting surface 21a of the valve body 21
For example, four ports A, B, P, and T for communicating fluid are formed in the connection port 25 provided in the. Then, the left and right solenoids 24A, 2
The position of the spool 22 is switched by selectively activating 4B to control the switching of port A and port B to port P and port T.

As shown in FIG. 1, the port A is located on the inlet / outlet side (the lower side in the figure) of the port hole 26.
A hole 27 for mounting an orifice or check valve formed to have a diameter larger than the diameter D1 and a counterbore for accommodating an O-ring 28, which is a sealing member, on the gasket mounting surface 21a side of the hole 27. The portion 29 is formed to have a larger diameter than the storage hole 27.

The spot facing portion 29 is formed into a tapered groove having a tapered surface 29a in which the groove depth from the gasket mounting surface side 21a gradually increases toward the outside. An orifice (port orifice) 31 is detachably mounted in the storage hole 27 of the control valve 20, and the orifice 31 has a communication hole 32 communicating with the port hole 26 of the control valve 20. The communication hole 32 is composed of a large diameter portion 32a and a throttle hole 32b having an orifice diameter D2 formed according to a predetermined characteristic. The orifice 31 is removed from the control valve 20 in the large diameter portion 32a. The screw part 33 for removal used at the time is formed.

The orifice 31 has a length L in the mounting direction indicated by an arrow E in FIG. 1, and the position of the rear end surface 31a is substantially the same as or slightly deeper than the gasket mounting surface 21a of the control valve 20 in the mounted state shown in the drawing. The outer diameter D3 of the stepped portion 31b corresponding to the counterbore portion 29 of the control valve 20 is controlled while the position (the length that allows a slight gap between the rear end surface 31a and the gasket mounting surface 21a) is set. It is formed to have a diameter smaller than the outer diameter D4 of the outer peripheral portion fitted into the housing hole 27 of the valve 20 and larger than the large diameter portion 32a of the communication hole 32.

When the orifice 31 is mounted in the storage hole 27 of the control valve 20, the abutment portion 31c is inserted into the storage hole 27 of the control valve 20 shown in FIG.
As shown in the figure, it is fitted into the inclined stepped portion of. Next, the O-ring 28 is attached to the counterbore 29 of the control valve 20, and is attached to the gasket mounting surface 21a of the valve body 21 of the control valve 20 via the gasket (not shown). The valve body 21 and the attachment device 8 are integrally tightened and fixed by a fixing bolt or the like, and the orifice 31 is sandwiched and fixedly held between them.

When the orifice 31 is attached, the O-ring 28 partially enters the step 31b of the orifice 31 as shown in FIG. A slight gap (relief) S is formed between the portion 31b and the outer peripheral surface of the outer diameter D3.

According to the control valve 20 and the orifice 31 configured as above, when the orifice 31 is fitted into the accommodation hole 27 and mounted as described above, the position of the rear end face 31a of the orifice 31 is the gasket of the control valve 20. Mounting surface 21
Since it is fixed and held at a position substantially the same as or slightly deeper than a, it is not necessary to fix the orifice 31 to the valve body 21 by using a screw part or an adhesive. The cost can be reduced as much as screwing is unnecessary, and since the orifice 31 can be easily attached to the valve body 21, the parts replacement work is simplified and the serviceability is improved.

Further, in the conventional control valve of the type having a threaded portion in the port hole, two types of control valve are provided, one in which the port hole is threaded and the other in which the port hole is not screwed when considering the case where the orifice is not used. It was necessary to prepare and manage the troublesome parts properly (there may be a screw part, but the cost will increase due to the machining), but according to this embodiment, such troublesome parts management is required. There is no need to do it. Further, it is possible to save the trouble of forming a special screw portion such as a taper screw in order to prevent the loosening of the orifice.

Further, as in the case of the top hat type orifice 12 described with reference to FIG. 6, the counterbore portion 11 for accommodating the O-ring 6 is also used as a groove for fixing and holding the collar portion 12a of the orifice 12. In this case, the depth of the spot facing portion 11 is determined by the thickness of the O-ring 6, and the thickness t of the collar portion 12a is limited by the thickness, so that the thickness t can be maintained until sufficient mechanical strength is obtained. Since the thickness of the flange 12a cannot be adjusted, the force generated by the pressure difference before and after the orifice cannot be received by the collar portion 12a with sufficient mechanical strength, and the usable range is limited to the case where the pressure difference is relatively small. However, according to this embodiment, it is possible to solve the problem.

That is, the orifice 31 shown in FIG.
Is the valve body 21 in the flow direction of the fluid (vertical direction in the figure).
Since the counterbore 29 for accommodating the O-ring 28 is used for the positioning with respect to the O-ring 28, the accommodating hole 27 is separately formed, so that the accommodating hole 27 is not restricted by the thickness of the O-ring 28. You can go deep.

Therefore, the communication hole 32 of the orifice 31
The hole diameter D5 of the port hole 8b of the mounting device 8 communicating with the control valve 20 is such that when the orifice 31 is not attached to the control valve 20,
Since it is preferable to increase the pressure loss in order to reduce the pressure loss, when this is done, the pressure difference before and after the orifice becomes large when used with the orifice 31 attached, and a large force generated by the pressure difference is applied to the orifice 31. The abutting portion 31c of FIG. 1 is received, but since that portion has sufficient mechanical strength by having a sufficient thickness, it can be reliably received.

As described above, when the orifice 31 is mounted on the valve body 21, the abutting portion 31c receives a force in the E direction shown in FIG. 1 and a force in the opposite direction to the rear end face 31.
The edge 31d near the outer periphery of a is the port hole 8b of the attachment device 8.
By abutting on the mounting surface 8a in the vicinity, the mounting surface 8a receives and is restricted from moving in each direction.

The orifice 31 is connected to the control valve 20.
When removing from the valve main body 21 of No. 1, a dedicated removal jig (not shown) having a male screw portion formed on the tip side is screwed into the removal screw portion 33 of the orifice 31 and, in that state, downward as shown in FIG. If you pull it out to, you can easily take it out.

By the way, the control valve 20 has the orifice 3 at the port A in FIG. 1 (the same applies to the other ports).
It may be used without mounting 1. At this time, depending on the flow rate of the fluid flowing through the communication hole 32 of the orifice 31 and the port A (or other port) of the control valve 20, the O-ring 28 may be attracted toward the center side.

However, the control valve 2 according to this embodiment
The valve body 21 of 0 has the O-ring 28 as described in FIG.
Since the counterbore portion 29 for accommodating is formed in a taper groove having a taper surface 29a in which the groove depth from the gasket mounting surface side 21a gradually increases toward the outside,
The above suction can be prevented.

Further, the orifice 31 is the O-ring 2
Since a gap (escape) S is formed between the inner periphery of 8 and the outer peripheral surface of the outer diameter D3 of the step portion 31b, the space of the O-ring 28 is sufficient even when a large flow rate is flown. Can be secured. In addition, since the above suction is hardly generated in a device used in a device with a small flow rate, the counterbore 29
A flat groove can be formed without tapering the tapered surface 29a.

Further, each port of the connection port 25 (FIG. 2) is not limited to the above-mentioned port A, but other ports B,
In the same way for the port P and the port T, the orifice 31
It is formed in a shape that can be mounted. Since both the orifice 31 and the valve body 21 of the control valve 20 are usually made of metal, they come into metal contact with each other, and the outer peripheral leakage before and after the orifice hardly occurs. Therefore, the diameter of the throttle hole 32b of the orifice 31 is small. The flow rate can be controlled very accurately.

FIG. 3 is a sectional view showing an embodiment of the orifice in which the area of the rear end face is increased by changing the groove shape of the portion corresponding to the counterbore portion of the control valve, and the portion corresponding to FIG. 1 is the same. The symbol is attached. The orifice 41 has a stepped portion 31b 'corresponding to the counterbore portion 29 of the control valve 20 having a V-shaped cross-sectional shape so that the rear end face 31a has a large area, and the orifice 31 according to the embodiment of FIG. Since the port hole 8b of the attachment device 8 that is attached and fixed to the control valve 20 (see FIG. 2) can be made larger than that when it is used, the pressure loss when the orifice is not attached can be made smaller. it can.

FIG. 4 is a sectional view showing the mounting state of the check valve which can be mounted in the storage hole formed in the valve body of the control valve of FIG. 2, and the portions corresponding to those in FIG. There is. The check valve 50 can be detachably mounted in the storage hole 27 of the control valve 20 (see FIG. 2) like the orifice 31 described in FIG. 1, and communicates with the port hole 26 of the control valve 20. 52a and 52b, the length L of the check valve body 51 in the mounting direction is set so that the position of the rear end surface 51a in the mounted state is the gasket mounting surface 21 of the control valve 20.
The step portion 57 corresponding to the counterbore portion 29 of the control valve 20 is provided at a position substantially the same as or slightly deeper than a.
The outer diameter D6 of the control valve 20 is smaller than the outer diameter D7 of the portion fitted into the housing hole 27 of the control valve 20 and larger than the diameter of the communication hole 52b.

The check valve main body 51 comprises an inlet side main body 53 and an outlet side main body 54, and a spring 55 interposed in the outlet side main body 54 causes a hard ball 56 to communicate with the inlet side main body 53 by a predetermined biasing force. When the valve opening pressure that presses against the edge of 52b and pushes the hard ball 55 into the communication hole 52b of the inlet-side main body 53, the hard ball 56 is pushed up and the communication holes 52a and 52b communicate with each other.

The outlet side body 54 has openings 54a, 5a.
4b and 54c are formed respectively, and the communication hole 52a in the outlet side main body 54 is formed through the respective openings of the control valve 20.
Of the valve body 21 communicates with the port hole 26. Even with this check valve 50, the orifice 31 described in FIG.
In the same manner as in the above case, it is possible to fix it in the storage hole 27 of the control valve 20 without forming a fixing and holding screw portion in the storage hole 27 of the control valve 20 or using an adhesive. The cost can be reduced by the amount that screw processing is unnecessary, and the serviceability is improved by simplifying the parts replacement work.

Further, since the force due to the differential pressure before and after the check valve can be received with sufficient mechanical strength, it can be used even when the pressure difference before and after the check valve is large, so that the range of use is limited. There is no such thing.
Further, a sufficient space for the O-ring (sealing member) 28 can be secured. In addition, if a threaded portion similar to the threaded portion 33 for removing the orifice 31 described in the embodiment of FIG. 1 is formed on the inlet side of the communication hole 52b of the inlet side main body 53, the check valve 50 can be attached to the valve main body 21. It is convenient to remove from.

[0043]

As described above, according to the control valve and the orifice or the control valve and the check valve according to the present invention, a special screw portion or the like for fixing the orifice or the check valve to the valve body of the control valve is provided. Since it is possible to mount and fix the orifice or check valve by simply inserting it into the control hole of the control valve without processing with the valve body side or using adhesive, it is possible to reduce costs and replace parts. Can be done easily and serviceability is improved.

Since the accommodation hole for accommodating the orifice or the check valve is formed separately from the spot facing portion for accommodating the seal member, there is no restriction on the thickness of the seal member such as the O-ring. Since the storage hole can be deepened in the hole, the thickness of the orifice inserted into it or the fitting part of the check valve can be made thicker according to the depth of the storage hole. The force generated by the pressure difference can be received by the fitting portion with sufficient mechanical strength.

Therefore, even if the pressure difference before and after the orifice or before and after the check valve is large, it can be used, and the range of use is not limited. Further, since the orifice and the check valve have the outer diameter of the portion corresponding to the counterbore part of the control valve smaller than the outer diameter of the outer peripheral part fitted into the accommodation hole, the seal member mounted on the counterbore part is It is possible to secure a sufficient space and handle a large flow rate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which an orifice is attached to a control valve showing an embodiment of the present invention in an enlarged manner in the vicinity of the attachment portion.

FIG. 2 is a schematic view showing in simplified form two surfaces near the connection port on the front surface and the lower surface of the entire control valve.

FIG. 3 is a cross-sectional view showing an embodiment of the orifice in which the area of the rear end face is increased by changing the groove shape of the portion corresponding to the spot facing portion of the control valve.

4 is a cross-sectional view showing a mounting state of a check valve that can be mounted in a storage hole formed in the valve body of the control valve of FIG.

FIG. 5 is a cross-sectional view showing an example of a control valve used in a conventional hydraulic circuit and an orifice mounted on its connection port.

FIG. 6 is a cross-sectional view showing an example of a top hat-shaped stepped orifice as another different example.

[Explanation of symbols]

 20 Control valve 21 Valve body 21a Gasket mounting surface 22 Spool (valve body) 25 Connection port 26 Port hole 27 Storage hole 28 O-ring (seal member) 29 Counterbore part 31,41 Orifice 31a, 51a Rear end face 32, 52a, 52b Communication hole 50 Check valve 51 Check valve body

Claims (3)

[Claims] 1. A port hole for allowing fluid to communicate with a connection port provided on a gasket mounting surface of a valve body for movably housing a valve body, and a diameter larger than a diameter of the port hole on an inlet / outlet side of the port hole. A storage hole for mounting the orifice or the check valve formed in the above, and a spot facing portion for storing a seal member having a diameter larger than the storage hole are formed on the gasket mounting surface side of the storage hole. A control valve characterized in that 2. An orifice detachably mounted in a storage hole of the control valve according to claim 1, further comprising a communication hole communicating with a port hole of the control valve, wherein a length in a mounting direction is set. In this state, the position of the rear end surface of the control valve is set to be approximately the same as or slightly deeper than the gasket mounting surface of the control valve, and the outer diameter of the portion corresponding to the counterbore part of the control valve is set to the control valve. An orifice having a diameter smaller than an outer diameter of an outer peripheral portion fitted into a housing hole and larger than the communication hole. 3. A check valve removably mounted in a storage hole of a control valve according to claim 1, comprising a communication hole communicating with a port hole of the control valve, and having a length in a mounting direction, In the mounted state, the position of the rear end surface of the control valve is set to be substantially the same as or slightly deeper than the gasket mounting surface of the control valve, and the outer diameter of the portion corresponding to the counterbore part of the control valve is set to the control valve. The check valve is formed so as to have a diameter smaller than the outer diameter of the outer peripheral portion fitted into the housing hole and larger than the communication hole.