JP2004156762A - Valve unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a valve unit capable of preventing the fluid from flowing in by a simple circuit constitution. <P>SOLUTION: An output channel 42 is communicated to a receiving hole 16 in a main valve unit 2, besides a main valve body 22 is supported to a movement free to a shaft direction in the main valve unit 2. The receiving hole 16 is communicated to the first supply channel 50 through the first valve seat 24, and also the receiving hole 16 to the second supply channel 56 through the second valve seat 34. The main valve body 22 has a valve section 22a that sits on the first valve seat 24 and the second valve seat 34 by moving the main valve body 22 between the first valve seat 24 and the second valve seat 34. The pilot valve 136 that moves the main valve body 22 by guiding the incoming and outgoing of the pilot fluid to a pilot room 126, and a open/close valve 103 that opens and closes the second supply channel 56, are arranged between the first position that the valve section 22a sits on the first valve seat 24 and separates from the second valve seat 34 and the second position that the valve section 22a sits on the second valve seat 34 and separates from the first valve seat 24 in the main valve unit 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve device that alternately leads two different types of fluids, for example, coolant and compressed air, from an output flow path.
[0002]
[Prior art]
Conventionally, as disclosed in Patent Document 1, a nozzle is provided near a tool of a machine tool, and a solenoid valve and a check valve are sequentially interposed in the middle of an air pipe connected to an air source. The tip is connected to the nozzle. In addition, a device has been proposed in which a solenoid valve and a check valve are sequentially interposed in the middle of a coolant pipe connected to a coolant supply source, and the coolant pipe is connected between a check valve and a nozzle of an air pipe. .
[0003]
In this device, coolant is supplied from a coolant pipe to an air pipe, and is ejected from a nozzle together with compressed air. The check valve prevents the coolant from flowing from the coolant pipe side to the air pipe side.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 8-257787 (page 2, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in such a conventional device, a check valve must be provided so that the coolant does not flow into the air pipe side, and there has been a problem that a circuit becomes complicated and the device becomes large.
[0006]
An object of the present invention is to provide a valve device that can prevent inflow with a simple circuit configuration.
[0007]
[Means for Solving the Problems]
In order to achieve the object, the present invention has taken the following means to solve the object. That is,
The main valve body is supported movably in the axial direction in the main valve body, and an output flow path is communicated with a storage hole in the main valve body, and the storage hole and the first supply flow path are connected to a first valve seat. And the storage hole communicates with the second supply passage through a second valve seat, and the main valve element is provided between the first valve seat and the second valve seat. A valve portion seated on the first valve seat and the second valve seat by movement of a body,
A first position where the valve portion is seated on the first valve seat and is separated from the second valve seat; and a valve portion is seated on the second valve seat and is separated from the first valve seat. The main valve body is provided with a pilot valve for moving the main valve body by drawing and introducing a pilot fluid into and from the pilot chamber, and an opening / closing valve for controlling opening / closing of the second supply passage. This is the valve device characterized by being provided.
[0008]
A connection hole may be formed in the main valve body in the axial direction, and the connection hole may form a part of the second supply flow path. Further, the fluid supplied to the first supply channel and the second supply channel may be two different types of fluids.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 3, reference numeral 1 denotes a main valve, and a large-diameter hole 4, an insertion hole 6, a small-diameter hole 8, a communication hole 10, and a slide hole 12 are concentrically formed on a main valve body 2 of the main valve 1. Is formed continuously. A first seat member 14 is inserted into the insertion hole 6, and the storage hole 16, the receiving hole 18, and the like are sequentially inserted from the large-diameter hole 4 side toward the sliding hole 12 side in the first seat member 14. A connecting hole 20 is formed. The main valve body 22 is accommodated in the accommodation hole 18 so as to be movable in the axial direction. The storage hole 16 and the storage hole 18 communicate with each other via a first valve seat 24.
[0010]
A second seat member 26 is further inserted into the insertion hole 6. The second seat member 26 has an insertion hole 28 and a tapered hole in order from the large-diameter hole 4 side toward the sliding hole 12 side. 30, a receiving hole 32 is formed. The storage hole 16 communicates with the storage hole 32 via a second valve seat 34 formed to face the first valve seat 24.
[0011]
The valve portion 22a of the main valve body 22 is disposed in the storage hole 16, and the valve portion 22a is configured to be able to be seated on the first valve seat 24 and the second valve seat 34 by movement of the main valve body 22, respectively. I have. The storage hole 16 communicates with the discharge hole 40 via a connection hole 36 formed in a direction orthogonal to the axial direction of the main valve body 22 and an annular chamber 38. In the present embodiment, an output channel 42 is formed by the connection hole 36, the annular chamber 38, and the discharge hole 40. The output flow path 42 is connected to a nozzle 44 as shown in FIG. 2, and is arranged so that coolant or compressed air discharged from the nozzle 44 is blown to a tool 46.
[0012]
A first supply hole 48 communicates with the small diameter hole 8, and the first supply passage 50 is formed by the small diameter hole 8, the receiving hole 18, the connecting hole 20, and the first supply hole 48. . The first supply flow path 50 is connected to a coolant supply source 52 as shown in FIG.
[0013]
The main valve body 22 is formed with a connection hole 54 penetrating in the axial direction. One end of the main valve body 22 is housed in the housing hole 32, and the connection hole 54 is inserted into the housing hole 32. It is open. The connection hole 54 forms a part of a second supply channel 56 described later.
The main valve 1 includes a first position 1a in which the valve portion 22a is seated on the first valve seat 24 and separated from the second valve seat 34 to communicate the output flow path 42 and the second supply flow path 56; 22a is provided with a second position 1b which is seated on the second valve seat 34, is separated from the first valve seat 24, and communicates the output flow path 42 and the first supply flow path 50.
[0014]
On the other hand, a check valve body 58 is movably housed in the insertion hole 28 of the second seat member 26, and is inserted into the insertion hole 28 by the plug member 60 inserted into the large-diameter hole 4. The hole 28 and the large-diameter hole 4 are closed. A coil spring 62 is interposed between the plug member 60 and the check valve body 58.
[0015]
A bottomed hole 62 is formed in the plug member 60 from the side of the check valve body 58. The bottomed hole 62 is connected to a return hole 64 formed in the main valve body 2, a communication hole 66, an annular chamber 70, and a communication hole. The holes 68 and the annular chamber 72 communicate with each other. The return hole 64 is connected to an external tank 73 serving as a low pressure side. The discharge passage 75 is constituted by the bottomed hole 62, the communication hole 66, the annular chamber 70, the communication hole 68, the annular chamber 72, and the return hole 64. By discharging the fluid from the discharge flow channel 75 to the low pressure side, the pressure of the receiving hole 32 is reduced, and the back pressure is prevented from acting on the main valve body 22.
[0016]
When the check valve body 58 receives the action of the fluid flowing into the receiving hole 32 from the connection hole 54, the check valve body 58 is seated on the end face of the plug member 60 against the urging force of the coil spring 62. A check valve 74 for closing the bottom hole 62 is formed. When the discharge channel 75 is not provided, the check valve 74 does not need to be provided.
[0017]
The main valve body 22 protrudes into the sliding hole 12, and a plate-shaped member 76 is fixed to the main valve body 22 in the sliding hole 12 via a nut 78. A guide member 80 is fixed to the bottom of the slide hole 12, and the main valve body 22 is slidably inserted through the guide member 80. A coil spring 82 is interposed between the plate-shaped member 76 and the guide member 80 to urge the main valve body 22 to the first position 1a where the main valve body 22 is seated on the first valve seat 24.
[0018]
A piston 84 is slidably inserted into the sliding hole 12, and the sliding hole 12 is closed by a lid member 86. A guide member 88 projecting into the slide hole 12 is screwed onto the lid member 86 concentrically with the main valve body 22. The distal end of the guide member 88 protruding into the slide hole 12 is slidably inserted into the piston 84, and a through hole 90 is formed in the guide member 88 in the axial direction. The through-hole 90 communicates with the connection hole 54, and the cover member 86 has a communication hole 92 that communicates with the through-hole 90.
[0019]
A large-diameter hole 94 is formed in the lid member 86 so as to be connected to the communication hole 92, and a valve seat 96 is formed around the communication hole 92. A through hole 98 is formed in the cover member 86 toward the main valve body 2 while communicating with the large diameter hole 94. A second supply hole 100 communicating with the through hole 98 is formed in the main valve body 2, and the second supply hole 100 is connected to a compressed air supply source 102 as shown in FIG. . In the present embodiment, the connection holes 54, the through holes 90, the communication holes 92, the large diameter holes 94, the through holes 98, and the second supply holes 100 form the second supply passage 56.
[0020]
An on-off valve 103 is attached to the lid member 86 so as to face the large-diameter hole 94. As shown in FIG. 4, the on-off valve 103 includes an on-off valve body 104 disposed to face the valve seat 96, and the on-off valve body 104 is fixed by sandwiching the diaphragm 106 together with a fixing member 108. The diaphragm 106 is sandwiched and fixed between the on-off valve main body 110 and the cover member 86, the large-diameter hole 94 is closed by the diaphragm 106, and the back-pressure chamber 112 containing the fixing member 108 is formed in the on-off valve main body 110. ing.
[0021]
When the solenoid 114 is not energized, the valve body 116 contacts the end of the valve body 104 by the biasing force of the spring 118, and closes the through hole 120 formed in the valve body 104. Further, the on-off valve body 104 is seated on the valve seat 96. In the seated state, the compressed air introduced from the supply source 102 into the large-diameter hole 94 is introduced into the back pressure chamber 112 via the throttle hole 122 of the diaphragm 106 and the communication hole 124 of the fixing member 108.
[0022]
The on-off valve element 104 receives the action of the biasing force of the spring 118 and the compressed air pressure of the back pressure chamber 112 in the seating direction, and receives the action of the compressed air pressure of the large-diameter hole 94 in the unseating direction. Due to the pressure receiving area, the acting force in the seating direction exceeds, and the on-off valve body 104 is configured to maintain the state of the first position 103a seated on the valve seat 96. Therefore, the second supply channel 56 is shut off.
[0023]
When the solenoid 114 is excited, the on-off valve 103 moves up and the valve element 116 moves away from the on-off valve element 104. Therefore, the back pressure chamber 112 is connected to the communication hole 92 via the through hole 120, and the compressed air in the back pressure chamber 112 is discharged, so that the pressure in the back pressure chamber 112 decreases. Thus, the opening / closing valve body 104 is configured to switch to the second position 103b separated from the valve seat 96 under the action of the compressed air pressure in the large-diameter hole 94 against the urging force of the spring 118. , The second supply flow path 56.
[0024]
On the other hand, the main valve body 2 is provided with a pilot chamber 126 surrounded by the sliding hole 12, the piston 84, and the lid member 86. As shown in FIG. A connection hole 128 communicating with the connection hole 128 and a bottomed hole 130 connected to the connection hole 128 are formed. An introduction hole 134 is connected to the bottomed hole 130 via a valve seat 132, and the introduction hole 134 is connected to the second supply hole 100.
[0025]
The distal end of the pilot valve body 138 of the pilot valve 136 attached to the main valve body 2 is inserted into the bottomed hole 130. The pilot valve 136 is biased by a spring 142 so that the pilot valve body 138 is seated on the valve seat 132 when the solenoid 140 is not excited. When the solenoid 140 is excited, the pilot valve body 138 moves and separates from the valve seat 132, and connects the pilot chamber 126 and the second supply hole 100 via the introduction hole 134, the bottomed hole 130, and the connection hole 128. It is configured to
[0026]
Next, the operation of the above-described valve device of the present embodiment will be described.
First, as shown in FIG. 2, when the solenoid 114 of the on-off valve 103 and the solenoid 140 of the pilot valve 136 are in a non-excited state, the on-off valve 103 is in the first position 103a and the second supply flow path 56 Is shut off, the pilot valve 136 shuts off the introduction hole 134, and compressed air as pilot fluid is not introduced into the pilot chamber 126.
[0027]
Therefore, the main valve 1 is in the state of the first position 1a where the valve portion 22a is seated on the first valve seat 24 by the urging force of the coil spring 82 and is separated from the second valve seat 34. As a result, the first supply channel 50 is shut off, and the second supply channel 56 and the output channel 42 are in communication. Since the second supply channel 56 is shut off by the on-off valve 103, no compressed air is supplied from the supply source 102 to the output channel 42.
[0028]
In this state, when the solenoid 140 of the pilot valve 136 is excited, the compressed air from the second supply channel 56 is introduced into the pilot chamber 126 as a pilot fluid. Accordingly, the piston 84 moves the main valve body 22 against the urging force of the coil spring 82 under the action of the introduced pilot fluid pressure, and separates the valve portion 22a from the first valve seat 24, The valve portion 22a is seated on the second valve seat 34 to switch to the second position 1b.
[0029]
Therefore, the output flow path 42 and the first supply flow path 50 communicate with each other, the coolant is sprayed from the nozzle 44, and the tool 46 is cooled and washed. At this time, the second supply channel 56 is in a state of being shut off by the on-off valve 103. In the first supply channel 50, the valve portion 22 a is seated on the second valve seat 34 and shuts off, so that no coolant leaks out and no coolant enters the second supply channel 56. .
[0030]
When the solenoid 140 of the pilot valve 136 is de-energized, the introduction hole 134 is shut off, and the pilot chamber 126 is released to the atmosphere through the connection hole 128, the bottomed hole 130, and the pilot valve 136. The main valve 1 is switched to the first position 1 a where the main valve body 22 is moved by the urging force of the coil spring 82 so that the valve portion 22 a is seated on the first valve seat 24 and is separated from the second valve seat 34. Therefore, the supply of the coolant is stopped.
[0031]
When the solenoid 114 of the on-off valve 103 is excited from this state, the valve element 116 separates from the on-off valve element 104, the pressure in the back pressure chamber 112 decreases, and the on-off valve element 104 separates from the valve seat 96. Therefore, the second supply flow path 56 is communicated, and compressed air is supplied from the supply source 102 to the nozzle 44 via the second supply flow path 56 and the output flow path 42, and the compressed air discharged from the nozzle 44 46 is cleaned. At this time, the check valve 74 receives the action of the compressed air discharged from the connection hole 54, and the check valve body 58 sits on the end face of the plug member 60 and closes the bottomed hole 62. There is no leakage from the return hole 64.
[0032]
When the solenoid 114 of the on-off valve 103 is de-energized, the on-off valve body 104 is seated on the valve seat 96 via the valve body 116 by the urging force of the spring 118, and the second supply flow path 56 is shut off. In the present embodiment, the coolant is connected to the first supply flow path 50 and the compressed air is supplied to the second supply flow path 56. The two supply channels 56 may be connected to supply coolant. Alternatively, the present invention is not limited to two kinds of fluids, that is, a gas and a liquid of compressed air and a coolant, and may be connected to supply two kinds of different gases or liquids.
[0033]
As described above, the present invention is not limited to such an embodiment at all, and can be implemented in various modes without departing from the gist of the present invention.
[0034]
【The invention's effect】
As described in detail above, when the main valve is switched to the second position, the first supply flow path is connected to the output flow path, and the main valve body is seated on the second valve seat. In addition, since the fluid is prevented from being led out to the second supply channel side, there is an effect that the check valve can be eliminated.
[0035]
Further, when the connection hole is formed in the main valve body as a part of the second supply flow path, the main valve body can be made smaller and the entire valve device can be made smaller than when the entire second supply flow path is provided in the main valve body. The size can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a valve device as one embodiment of the present invention.
FIG. 2 is a circuit diagram of the valve device of the present embodiment.
FIG. 3 is an enlarged sectional view of a main part of the main valve of the embodiment.
FIG. 4 is an enlarged sectional view of the on-off valve according to the embodiment.
FIG. 5 is an enlarged sectional view of the pilot valve according to the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Main valve 2 ... Main valve main body 16 ... Storage hole 22 ... Main valve body 22a ... Valve part 24 ... 1st valve seat 34 ... 2nd valve seat 42 ... Output channel 44 ... Nozzle 46 ... Tool 50 ... 1st supply Flow paths 52, 102 Supply source 56 Second supply path 58 Check valve 73 Tank 74 Check valve 75 Discharge path 84 Piston 86 Cover member 88 Guide member 100 Second supply hole 103 ... on-off valve 104 ... on-off valve body 106 ... diaphragm 126 ... pilot chamber 136 ... pilot valve 138 ... pilot valve body

Claims (3)

The main valve body is supported movably in the axial direction in the main valve body, and an output flow path is communicated with a storage hole in the main valve body, and the storage hole and the first supply flow path are connected to a first valve seat. And the storage hole communicates with the second supply passage through a second valve seat, and the main valve element is provided between the first valve seat and the second valve seat. A valve portion seated on the first valve seat and the second valve seat by movement of a body,
A first position where the valve portion is seated on the first valve seat and is separated from the second valve seat; and a valve portion is seated on the second valve seat and is separated from the first valve seat. The main valve body is provided with a pilot valve for moving the main valve body by introducing and drawing a pilot fluid into and from the pilot chamber, and an opening and closing valve for controlling the opening and closing of the second supply flow path between the main valve body and the second position. A valve device characterized by being provided. The valve device according to claim 1, wherein a connection hole is formed in the main valve body in an axial direction, and the connection hole forms a part of the second supply flow path. 3. The valve device according to claim 1, wherein the fluid supplied to the first supply channel and the second supply channel is two different types of fluids. 4.

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