JPS6131344B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a three-way solenoid valve for controlling the flow of compressed gas such as compressed air.

(Prior Art) Generally, a three-way solenoid valve is used to control the flow of compressed air that operates an air machine. Such a three-way solenoid valve is energized during the period when compressed air is supplied to the air machine, and the An operation is performed in which the magnet is not energized during the period when air is being discharged to the outside, or vice versa, it is not energized during the period when compressed air is being supplied, and it is energized during the period when the air is being discharged.

(Problem to be solved by the invention) However, in this type of three-way solenoid valve, if a power failure occurs in the operating circuit during excitation, it not only malfunctions and impairs safety, but also if excitation continues for a long time. This increases electricity consumption, which is economically disadvantageous.

In view of these points, it is an object of the present invention to provide a three-way solenoid valve that can switch the flow of compressed gas by energizing only when the valve is switched.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an inlet for taking in compressed gas from a compressor, an outlet for supplying the compressed gas to a gas machine, and a supply port for supplying the compressed gas to a gas machine. A valve body is provided with a discharge port for discharging the gas to the outside, and is formed with a working chamber into which the compressed gas alternately flows, and a gas flow switching chamber communicating with the discharge port and the delivery port. and,
The piston is slidably housed in the valve body, and the piston located in the working chamber and the main valve member located in the gas flow switching chamber are actuated by a valve rod coaxially fixed and an electromagnet, A first communication passage communicating between the supply inlet and the working chamber in the valve body and a second communication passage branched from this communication passage communicating with the atmosphere are alternately and selectively opened and a pilot valve that supplies or cuts off the supply of compressed gas into the working chamber, and also connects or cuts off the first communication passage to the atmosphere; The valve is held in a position where compressed gas is supplied into the working chamber, and the second communication path is cut off from the first communication path, and the pilot valve is released by the next excitation of the electromagnet, so that the pilot valve is compressed. a catch mechanism for shutting off the supply of gas to the working chamber and moving the valve to a position where the first communication passage and the second communication passage communicate with each other; A casing that extends in the axial direction of the main body and has a cylinder chamber; a catch member that is housed within the casing and is movable in the axial direction of the casing; A catch member cooperation part that moves integrally, a slide rod that holds the catch member, and a slide rod that is provided in a cylinder chamber in the casing and slides in the cylinder chamber in the axial direction, and that the slide rod passes through the cylinder chamber. A piston located in the working chamber and a cylinder chamber housing the piston are connected to the first communication passage, and a part of the compressed gas flowing into the working chamber when the pilot valve opens the first communication passage is guided to the cylinder chamber. a third communication passage for operating the piston that interlocks with the slide rod; a first elastic member that biases the piston in a direction in which the catch member holds the pilot valve; It has two second and third elastic members that cooperate with each other and are provided on the opposite side of the slide rod from the side that holds the catch member, and these two second and third elastic members are attached to the slide rod. The second elastic member is provided between the flange and the piston in the cylinder, the third elastic member is provided between the flange and the casing, and the valve stem in the valve body is provided on both sides of the flange. The pilot valve is elastically biased in the direction of communicating the inlet and the outlet, and the pilot valve is moved to the first position by the operation of the electromagnet.
When the communication passage is opened, the compressed gas introduced into the working chamber urges the piston in the cylinder in the opposite direction, with the catch member being held by the catch member cooperating section. The second elastic member is slid in a compressing direction by the compressed gas sent through the third communication path, and in this state, the electromagnet is activated to move the catch member cooperation part and open the catch member. When this occurs, the biasing force of the second elastic member exceeds the biasing force of the third elastic member, so that the slide rod detaches the catch member from the catch member cooperating portion, allowing the first communication passage of the pilot valve to be blocked. However, at this time, the supply of compressed gas to the third communication passage is cut off, and the piston in the cylinder slides in the direction in which the second elastic member extends, and when the first communication passage of the pilot valve is opened next, the piston in the cylinder slides in the direction in which the second elastic member extends. 3. The catch member is configured to move in the direction of holding the catch member cooperating portion by the action of the third elastic member.

(Function) When compressed gas is taken in from the inlet and supplied to the gas machine from the outlet, the pilot valve closes the communication between the inlet and the working chamber, and also allows the working chamber to communicate with the outside air. By setting the pressure in the working chamber to atmospheric pressure, the main valve member fixed to the valve stem closes the outlet, allowing the compressed gas that has flowed in from the inlet to flow out from the gas flow switching chamber to the outlet, and at the same time The cylinder chamber of the catch mechanism is also communicated with the outside air to maintain atmospheric pressure. When stopping this supply,
Once the electromagnetic coil is activated, the pilot valve is moved to communicate the working chamber and the supply inlet,
Compressed gas is allowed to flow into the working chamber, the piston is pressed by this pressure, the valve stem is slid, and the main valve member fixed to the valve stem closes the supply inlet, allowing the compressed gas to enter the gas flow path switching chamber. The inflow is blocked, and at the same time, the catch member cooperating section is moved, and the slider rod is moved toward the catch member cooperating section by the elastic force of the second and third elastic members to enter the catch member cooperating section below. As the cooperating part returns, this state is maintained by engaging with the catch member fixed to the tip of the slider rod, and furthermore, compressed gas is allowed to flow into the catch mechanism cylinder, and this pressure causes the piston to engage with the catch member. Slide in the opposite direction to the cooperating part. Next, when supplying compressed gas to the gas machine again, the electromagnetic coil is activated, the catch member cooperation part is moved to disengage the catch member, and the elastic force of the second and third elastic members is After pulling out the catch member at once, return the catch member cooperation part to its original state again, and at the same time close the communication between the supply inlet and the working chamber with the pilot valve in the same way as above, and open the working chamber to the outside air. In this way, compressed gas is supplied to the gas machine.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2, the three-way solenoid valve V of the present invention is installed between the air tank 2 of the compressor 1 and the air machine 3, and the compressed air from the air tank 2 is passed through the pipe 4 to the three-way solenoid valve V. sent to,
The compressed air exiting this three-way solenoid valve V is sent to the air machine 3 through a pipe 5.

The three-way solenoid valve V has an inlet 20 through which compressed air from the air tank 2 is supplied, an outlet 21 through which the compressed air entered from the inlet 20 is sent out to the air machine 3, and the compressed air inside the valve. a valve body B in which a discharge port 22 for discharging into the atmosphere is formed;
an electromagnetic actuator S that actuates a pilot valve 23 for switching the flow of air within the valve body B;
A catch mechanism part M is interposed between the electromagnetic actuating part S and the valve body B, and is used to restrict the movement of the pilot valve 23.

A valve stem 24 is slidably housed in the valve body B, and a piston 2 is located at the left end of the valve stem 24 in the drawing.
5 is fixed by a nut 27 screwed into the threaded portion 24a through a collar 26, and the piston 25
slides into the working chamber 28 in the valve body B, and the main valve member 29 is attached to the threaded portion 24 at the right end of the valve stem 24 in the figure.
The main valve member 29 is fixed by a nut 30 screwed into the main valve member 29, and moves in the left-right direction in the figure within the gas flow path switching chamber 31 of the valve body.

On the other hand, the inlet port 20 is connected to an intermediate chamber 32 formed in the center of the valve body, and a valve rod holder 33 that slidably supports the valve rod 24 is inserted from the left side of the intermediate chamber 32. The gas flow path switching chamber 31 is communicated with the gas flow path switching chamber 31 through a communication hole 32a, and the gas flow path switching chamber 31 is connected to the outlet 21 and the discharge port 22 formed in the side cover 34. Seats S ₁ and S ₂ are formed protrudingly on the left and right sides of the switching chamber 31 , and the main valve member 29 moves between these seats S ₁ and S ₂ .
Contact members 29a and 29b are attached to closely contact S ₁ and S ₂ .

On the other hand, the piston 2 sliding inside the working chamber 28
5 is a coil spring 3 inserted into the side cover 35
6 to the right in the figure, and an O-ring 37 for sealing is attached to the peripheral edge of the piston 25.
is embedded.

Above the intermediate chamber 32 is the pilot valve 23.
A pilot chamber 38 into which the
A seat S ₃ is formed protruding from the exit of the communication passage 39 on the pilot chamber 38 side, and a communication passage 40 is bored horizontally between the pilot chamber 38 and the working chamber 28 . The communication passages 39 and 40 form a first communication passage.

The upper part of the pilot chamber 38 is closed by a lid member 41, and the valve shaft 23a of the pilot valve 23 is loosely inserted through the center of the lid member 41 to provide a communication passage 42. middle room 3
A sheet S ₄ is formed at the exit on the 8th side, and this sheet S ₄
And abutting members 23d, 23 are provided at predetermined positions of the valve member 23b of the pilot valve corresponding to the seat _S3 .
e is installed.

Further, the lid member 41 is connected to the catch mechanism section M.
This casing 43 is provided with a communication passage 44 for communicating the pilot chamber 38 with the atmosphere, and this communication passage 44 is fitted into the groove 41a formed in the upper part of the lid member 41 and the communication passage. It is connected to 42. The communication passages 42 and 44 are connected to a second communication passage branched from the first communication passage.
It forms a communication path.

On the other hand, the valve shaft 23a of the pilot valve extends vertically through the casing 43, and is guided vertically in the figure by a catch member cooperating portion 45 fitted into the casing 43.
A notch 45a is provided at the lower end of the catch member 45, and when the catch member cooperating portion 45 is raised, the engaging protrusion 46a of the catch member 46 engages with the notch 45a to open the pilot valve 23. It is designed to hold it in place.

The catch member 46 is fixed to one end of a slide rod 47, and the slide rod 47 passes through the center of a piston 49 that slides horizontally in a cylinder chamber 48 formed in the casing 43. The other end is slidably supported by a cylindrical cover 50 that closes off the cylinder chamber 48 .
Further, a flange 47a is formed protruding from a portion of the slide rod 47 located inside the cylindrical cover 50, and coil springs 51 (third elastic member) and 52 (second elastic member) are formed on both left and right sides of this flange 47a. The coil spring 52 contacts the side surface 49a of the piston 49, and the coil springs 51, 52 are disposed between the side surface 49a and the cover wall 50a of the cylindrical cover 50.
A coil spring 53 (first elastic member) having a larger diameter than that of the coil spring 51, 5 is provided.
2, 53 connects the piston 49 to the pilot valve 23
It is biased toward the side (rightward).

Note that when the piston 49 is in the right position as shown in FIG. 2, the elastic force of the coil springs 51 and 52 exceeds the elastic force of the coil spring 52, and the elastic force of this difference is applied to the flange 47a.
When the piston 49 is in the left position as shown in FIG. 3, the elastic force of the coil spring 52 acts on the slide rod 47 through This differential elastic force acts on the slide rod 47 via the flange 47a and presses it to the left.

The piston 49 has an O for sealing on its periphery.
It consists of an enlarged part 49b to which a ring 54 is attached, and a protrusion 49c that projects horizontally from this enlarged part 49b and is inserted into a chamber 55 in which the catch member 46 is accommodated, and the above-mentioned chamber 55 and cylinder chamber 48 are connected to each other. A ring-shaped enlarged recess 56 is formed at the boundary between the two, and a communication passage 57 (third communication passage) is provided between the enlargement recess 56 and the working chamber 28 .

The upper part of the catch member cooperation part 45 as a guide member for guiding the valve shaft 23a of the pilot valve is enlarged to form a plunger receiving part 45b for receiving the plunger 58, and this plunger receiving part has a recessed part 45c. A protrusion 58a of the plunger 58 is inserted into the recess 45c, and a valve shaft 23a of the pilot valve is inserted into the protrusion 58a.
A cavity 61 is formed in which a spring receiver 59 fixed to the upper end portion 23c and a coil spring 60 that biases the spring receiver 59 upward in the figure are housed.

The plunger 58 is installed so as to be able to slide up and down within the electromagnetic coil 62, and its upper surface 58b faces the protruding lower end surface 63a of the fixed iron core 63, a portion of which is inserted into the electromagnetic coil 62. ,
The plunger 58 is attached to the lower end 64a of a shaft 64 that penetrates the fixed iron core 63, and the upper end 64b of the shaft 64 is used to lock the coil spring 65 in the recess 63b formed in the upper part of the fixed iron core 63. A spring receiver 66 is attached.

In addition, the electromagnetic coil 62 and the fixed iron core 63
etc. are provided in a casing 67, and an upper cover 68 is provided on the fixed iron core 63.

Next, the effect will be explained.

In the case shown in FIG. 2, compressed air from the air tank 2 enters the valve from the inlet 20, passes through the intermediate chamber 32 and the communication hole 32a connected to the intermediate chamber 32, and enters the gas flow switching chamber 31. , and further outlet 2
1 to the air machine 3. At this time, the valve stem 24 is pushed toward the outlet 22 via the piston 25 by the coil spring 36 housed in the side cover 35, and the valve rod 24 is The abutting member 29b of the main valve member 29 attached to the rod 24 abuts the seat _S2 and closes the discharge port 22.

Further, the valve member 23b of the pilot valve 23 has been lowered to a position where it closes the communication passage 39 communicating between the intermediate chamber 32 and the pilot chamber 38, and its lowering is performed as follows. That is, the plunger 5 engages with the catch member cooperating portion 45 as a guide member that guides the valve shaft 23a of the pilot valve.
8 is a coil spring 65 provided within the fixed iron core 63
is lowered by the action of the catch member cooperating portion 45.
The valve shaft 2 is compressed through the piston 59 in the cavity 61 while compressing the coil spring 60 provided in the cavity 61.
3a is pushed down, whereby the abutment member 23e of the valve member 23b of the pilot valve abuts against the seat _S3 , and the abutment member 23d leaves the seat _S4 .

Therefore, the working chamber 28 is the same as this working chamber 2.
8, a communication path 40 extending horizontally from the pilot chamber 3
8. Communication path 42 bored in lid member 41, communication path 41a formed in lid member 41, and casing 4
3, the valve stem 24 is connected to the atmosphere through a communication passage 44 provided horizontally in the valve stem 36.
It can easily slide toward the discharge port 22 side by the action of.

Further, at this time, the engagement between the engagement protrusion 46a of the catch member 46 and the notch 45a of the catch member cooperation part 45 is released, and the catch member cooperation part 45 is released.
can be moved up and down.

When the electromagnetic coil 62 is energized in the state shown in FIG. 2, the plunger 58 and the cap member cooperating section 45, which moves together with the plunger 58, move against the coil spring 65 and move around the fixed iron core, as shown in FIG. 6
At this time, the slide rod 47
From the elastic force of the coil spring 51, the coil spring 52
The elastic force obtained by subtracting the elastic force of the pilot valve 2
The chuck member 46 is biased in three directions and moves in the same direction, and the chuck member 46 fixed to the tip enters below the cap member cooperating portion 45. Then, by releasing the excitation, the cap member cooperating portion 45 descends, and the notch 45a and the engaging protrusion 46 of the chuck member 46 are connected to each other.
a is engaged and maintained in the position shown in FIG.

Along with this, the valve shaft 23a of the pilot valve is also pushed up due to the expansion of the coil spring 60, and the abutment member 23e of the valve member 23b is pushed up toward the communication path 39.
When the contact member 23d is opened, the contact member 23d contacts the corresponding sheet _S4 . In addition, at this time, the valve stem 2
A small gap l is formed between the upper surface of the spring receiver 59 attached to the upper end of the spring receiver 3a and the opposing wall of the cavity 61 facing this upper surface, and the plunger 5
A gap m is formed between the upper surface of the coil spring 6 and the protruding end surface 63a of the fixed iron core, and the small gap l is
The spring pressure of 0 sufficiently acts on the piston 59 to bring the abutting member 23d of the valve member into close contact with the seat _S4 , and the gap m is such that when the electromagnetic coil 62 is energized again as described later, the plunger 58 and the guide member 45 and catch the catch member 46.
This is for disengaging the engagement protrusion 46a from the notch 45a of the cap member cooperating portion 45.

When the valve member 23b of the pilot valve is lifted, the compressed air from the intermediate chamber 32 flows into the working chamber 28 through the communication passage 39, the pilot chamber 38, and the horizontal communication passage 40, and the valve rod 24
is slid to the left while resisting the coil spring 36.
Therefore, the contact member 29a of the main valve member 29 contacts the seat _S1 , while the discharge port 22 is opened, the supply of compressed air to the air machine 3 is cut off, and the pressure inside the compressor machine 3 is reduced. Atmospheric pressure.

Further, a part of the compressed air in the working chamber 28 enters the enlarged recess 56 through the communication passage 57, moves the piston 49 to the left, and compresses the coil spring 53 and the coil spring 52. However, the slide rod 47 does not move because the catch member 46 is caught in the notch 45a of the catch member cooperation part 45, the coil spring 51 is in a more extended state than in FIG. It is in a more compressed state than in Figure 2.

When returning from the state shown in FIG. 3 (pneumatic machine inoperative) to the state shown in FIG. 2 (pneumatic machine in operation), the electromagnetic coil 62 is energized again. When the electromagnetic coil 62 is excited, the plunger 58 and the catch member cooperating portion 45 are lifted and the catch member 46 is released.
It moves to the left by overcoming the spring pressure of 1. When the excitation of the coil 62 is cut off, the plunger 58
The guide member 45 is pushed down by the action of the coil spring 65, and the plunger 58 pushes down the pilot valve 23 to bring the abutment member 23e of the valve member 23b into contact with the seat _S3 . Therefore, the supply of compressed air into the working chamber 28 is cut off, and the pressure inside the working chamber 28 and the cylinder chamber 48 becomes atmospheric pressure because the communication passage 42 provided in the lid member 41 is opened. Piston 49 slides to the right under the action of coil spring 53, and valve stem 24 slides to the right under the action of coil spring 36, returning to the pneumatic operating state shown in FIG.

The three-way solenoid valve of the present invention can also be used for compressed gases other than compressed air.

〔Effect of the invention〕

By configuring the present invention as described above and energizing the electromagnetic coil only when switching the valve, it is possible to switch to both states of supplying compressed air to an air machine and discharging compressed air from the air machine. Unlike conventional three-way solenoid valves, which maintain the supply state during energization and maintain the discharge state during non-excitation, the supply state and discharge state can be maintained without energization except when switching. This eliminates the risk of erroneous operation even when the battery is used, and has the effect of significantly reducing electricity consumption.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the usage state of the three-way solenoid valve of the present invention, Fig. 2 is a longitudinal sectional view showing the state when the three-way solenoid valve of the present invention is supplying compressed air to an air machine, and Fig. 3 The figure is a longitudinal sectional view of the three-way solenoid valve of the present invention in a compressed air discharge state. 20... Inlet port, 21... Outlet port, 22... Outlet port, 23... Pilot valve, 24... Valve rod, 2
8... Working chamber, 29... Main valve member, 31... Passage switching chamber, 32... Intermediate chamber, 45... Catch member cooperation part, 46... Catch member, 47... Slide rod, 58... Plunger, 63...Fixed iron core.

Claims (1)

[Claims] 1 An inlet for taking in the compressed gas from the compressor, an outlet for supplying the compressed gas to the gas machine, and an outlet for discharging the compressed gas to the outside, and the compressed gas is alternately supplied. a valve body having a working chamber for inflow and a gas flow switching chamber communicating with the discharge port and the delivery port; a valve body slidably housed within the valve body and located within the working chamber; A piston and a main valve member located in the gas flow switching chamber are coaxially fixed to a valve rod, and a first valve rod that is actuated by an electromagnet and communicates between the inlet port and the working chamber in the valve body. The communication passage and the second communication passage branched from the communication passage and communicating with the atmosphere are alternately and selectively opened and closed to supply the compressed gas that has entered from the supply port into the working chamber or to cut off the supply of the compressed gas, and to a pilot valve that connects or shuts off the first communicating passage to the atmosphere; and a pilot valve that holds the pilot valve in a position where compressed gas is supplied into the working chamber when the electromagnet is excited and operates the pilot valve; The second communication passage is cut off from the first communication passage, and the pilot valve is opened by the next excitation of the electromagnet, and the pilot valve cuts off the supply of compressed gas to the working chamber, and at the same time, the second communication passage is cut off from the first communication passage. It has a catch mechanism section for enabling the catch mechanism to move to a position where it communicates with the second communication path, and the catch mechanism section includes:
A casing that extends in the axial direction of the valve body and has a cylinder chamber; a catch member that is housed within the casing and is movable in the axial direction of the casing; a catch member cooperation part that moves integrally with the catch member; a slide rod that holds the catch member; and a slide rod that is provided in a cylinder chamber in the casing and slides in the cylinder chamber in the axial direction, and that the slide rod passes through the cylinder chamber. and a cylinder chamber housing the piston is communicated with the first communication passage, and a part of the compressed gas flowing into the working chamber when the pilot valve opens the first communication passage is guided to the cylinder chamber. a third communicating path for operating the piston that interlocks with the slide rod; a first elastic member that biases the piston in a direction in which the catch member holds the pilot valve; two second and third elastic members that cooperate with each other are provided on the opposite side of the slide rod from the side that holds the catch member, and these two second and third elastic members are The second elastic member is provided between the flange and the piston in the cylinder, the third elastic member is provided between the flange and the casing, and the valve rod in the valve body is provided on both sides of the flange. It is elastically biased in the direction of communicating the inlet and outlet, and when the pilot valve opens the first communication passage due to the operation of the electromagnet, it is biased in the opposite direction by the compressed gas introduced into the working chamber. energized, and at this time, with the catch member being held by the catch member cooperating section, the piston in the cylinder is moved by the compressed gas sent through the third communication passage to the second elastic member. slides in the direction of compression, and in this state, when the electromagnet is activated to move the catch member cooperating section and release the catch member, the biasing force of the second elastic member exceeds the biasing force of the third elastic member. As a result, the slide rod disengages the catch member from the catch member cooperating portion, allowing the first communication passage of the pilot valve to be cut off, and at this time, the supply of compressed gas to the third communication passage is cut off, and the cylinder The inner piston slides in the direction in which the second elastic member extends, and when the first communication passage of the pilot valve is next opened, the catch member moves in the direction to hold the catch member cooperation part by the action of the third elastic member. A three-way solenoid valve that is characterized by: