JPH0828741A - Step flow control valve - Google Patents

Abstract

PURPOSE:To control the flow rate with high reliability by surely mainting a valve element at a specific valve opening position. CONSTITUTION:A one-way connecting means such as a one-way clutch inclusing a tapered surface 16 and ball 19 is provided between a valve element 5 and the valve opening drive plunger 9 of solenoid coils 29 or the like, so that the valve element 5 is moved stepwise so as to open every turning on of the solenoid coils 29. A check valve means including ball 22 or the like, which permits the valve element 5 to move so as to open or prohibits the element 5 from moving so as to close, is provided, and the check valve means is forced to be released by a valve closing drive plunger 10 upon closing of the valve. The valve closing plunger 10 is driven to be elevated by turning on the solenoid coils 29 in an opposite direction that upon opening of the valve through the combination of the solenoid coils 29 with permanent magnets 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step flow rate control valve, and more particularly to a step flow rate control valve for performing multi-stage refrigerant flow rate control and evaporation pressure control in a refrigeration cycle.

[0002]

2. Description of the Related Art Step flow rate control valves for performing multi-stage throttle flow rate control and evaporation pressure control of a refrigerant in a refrigeration cycle such as an air conditioner are disclosed in JP-A-3-113183 and JP-A-4-340356. Has been done. These step flow rate control valves drive the valve body in multiple stages in the axial direction by a multi-stage linear solenoid device, and perform flow rate control according to the valve opening position of the valve body.

[0003]

In a step flow rate control valve using a linear solenoid device as a valve drive actuator, the magnetic force of the linear solenoid device maintains the valve body in the valve open position, so that the valve opening retention force of the valve body is reduced. It is determined by the magnetic performance of the linear solenoid system, which has its limits. Therefore, if the fluid pressure acting on the valve body is high, the valve opening becomes unstable, and reliable flow rate control cannot be performed.

The present invention has been made by paying attention to the above-mentioned problems, and the fact that the valve body is located at a predetermined valve opening position can be reliably maintained without relying on the magnetic force and is highly reliable. It is an object of the present invention to provide a power-saving step flow rate control valve that controls flow rate and that does not require continuous energization of an electromagnetic coil to maintain the valve open state.

[0005]

In order to achieve the above-mentioned object, a step flow control valve according to the present invention comprises a valve body having a valve seat portion and an axial movement with respect to the valve body. A valve element that cooperates with a valve seat portion to control the flow rate, a return spring that urges the valve element in a valve closing direction, and a valve opening drive plunger that is movable in the valve opening and closing valve direction. Provided between the valve-opening drive plunger and the valve body and moving in the valve-opening direction of the valve-opening drive plunger brings the valve-opening drive plunger and the valve body into a locked state to connect the valve-opening drive plunger. One-way connecting means that is in a released state that allows relative displacement of the valve opening drive plunger and the valve body by moving in the valve closing direction, and in the valve closing direction of the valve body that allows movement of the valve body in the valve opening direction. Non-return means to prohibit the movement of And a second direction opposite to the first direction with respect to the electromagnetic coil by driving the valve opening drive plunger in the valve opening direction by energizing the electromagnetic coil in the first direction. And a magnetic drive means for forcibly releasing the one-way connecting means and the check means by the energization to bring the valve body into a free state.

In the step flow rate control valve according to the present invention, the one-way connecting means is a ball disposed between a tapered inner peripheral surface formed on the first plunger and a straight outer peripheral surface of the valve body, Alternatively, it may be constituted by a tapered ring member having a split groove.

A step flow rate control valve according to the present invention is movably provided between a first position and a second position, and is positioned at the second position to forcibly release the check means. And having a valve-closing plunger for making the valve element in a free state, the valve-closing plunger being provided with the second position by energizing the electromagnetic coil of the magnetic drive means in the second direction. May be driven to the detailed feature.

Further, in the step flow rate control valve according to the present invention, the one-way connecting means restrains the movement of the valve body in the valve closing direction with respect to the valve opening drive plunger, and the valve closing plunger has the second valve. It may be characterized in that the one-way connecting means is forced into a released state in addition to the forced release of the check means by being driven to the position.

Further, in the step flow rate control valve according to the present invention, a step for forcibly releasing the check means is provided at the lower portion of the straight outer peripheral surface of the valve body to limit the valve opening to a predetermined size. It may be characterized by being present. Further, in the step flow control valve according to the present invention, the check means is a ball arranged between the tapered inner peripheral surface of the taper ring member arranged on the valve body side and the straight outer peripheral surface of the valve body. A ratchet pawl that is non-reactively engaged with a ratchet tooth formed on the outer peripheral surface of the valve body, or a tapered shape that is axially movably fitted to the outer peripheral portion of the valve body and is formed on the valve body side. It may be configured by a collet chuck that is brought into a fastening state by engaging with the inner peripheral surface.

[0010]

According to the above-described structure, when the electromagnetic coil of the magnetic drive means is energized in the first direction, the valve opening drive plunger moves in the valve opening direction, and this movement causes the one-way connecting means to move. In the locked state, the valve element moves by one step to open the valve. When the energization of the electromagnetic coil is stopped, the valve opening drive plunger moves in the valve closing direction and returns to the original position. When the valve-opening drive plunger moves in the valve-closing direction, the one-way connecting means is released, so that only the valve-opening drive plunger returns to its original position, and the valve body is locked in its valve-opening position by the check means. It

As a result, the valve body is moved step by step every time the electromagnetic coil of the magnetic drive means is energized in the first direction. When the electromagnetic coil is energized in the first direction when the valve body moves to the predetermined position, the magnetic drive means is used to forcibly release the check means by the step on the lower outer peripheral surface of the straight body of the valve body. Even if the valve body is lifted, the opening degree of the valve body does not become larger than the predetermined position because it is not locked by the check means.

When the electromagnetic coil of the magnetic drive means is energized in the second direction, the check means is forcibly released and the valve body is in a free state so that the spring force of the return spring causes a maximum closing at once. Move to valve position.

[0013]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of a step flow control valve according to the present invention. The step flow control valve has a valve body 1, and the valve body 1 is provided with two connection ports 2 and 3 and a valve seat portion 4.

A needle-shaped valve element 5 is fitted in the valve body 1 so as to be movable in the axial direction (vertical direction in the drawing). The valve body 5 has a flow rate adjusting section 6 for controlling the flow rate in cooperation with the valve seat section 4 at the tip, and the maximum closed position (fully closed position) shown in FIG. It reciprocates between the position and the maximum valve opening position that is displaced upward in the figure.

A plunger holding tube 7 is fixedly mounted on the valve body 1 in the same direction as the axial direction of the valve body 5, and a stem portion 8 of the valve body 5 is provided at the center of the plunger holding tube 7.
Has been extended. In the plunger holding tube 7, a cylindrical valve opening drive plunger 9 and a cylindrical valve closing drive plunger 10 are fitted and loaded so as to be movable in the same direction as the moving direction of the valve body 5. A suction element 11 is fixedly mounted on the upper end of the plunger holding tube 7, and the lower bottom surface of the suction element 11 faces the upper end surface of the valve opening drive plunger 9 at a predetermined interval. This interval determines the valve opening amount (valve lift amount) for one step of the valve body 5.

A return spring 12 which is a compression coil spring is provided between the suction element 11 and the valve body 5, and the return spring 1 is provided.
2 urges the valve element 5 downward in the figure, that is, toward the valve closing direction. Inside the valve body 1, there is a taper ring member 14 having a tapered inner peripheral surface 13 (inverted V shape), and within the plunger holding tube 7 there is a plunger support pin 15
Are fixedly arranged, and the valve opening drive plunger 9 is
As shown in FIG. 1, it reciprocates between a lowered position placed on the plunger support pin 15 and a raised position in contact with the suction element 11.

The valve-opening drive plunger 9 has a tapered inner peripheral surface 16 that is thin (inverted V-shape), and between the tapered inner peripheral surface 16 and the straight outer peripheral surface 17 of the stem portion 8. A plurality of balls 19 for one-way connection means are arranged by the retainer 18. As shown in FIG. 2, the retainer 18 has a ring shape and holds three balls 19 rollably.

The ball 19 is wedge-engaged between the tapered inner peripheral surface 16 and the straight outer peripheral surface 17 due to the upward movement (movement in the valve opening direction) of the valve opening drive plunger 9 and the valve opening drive plunger 9 and the valve body 5. When the valve opening drive plunger 9 is in the locked state, the wedge engagement is released by the downward movement of the valve opening drive plunger 9 (movement in the valve closing direction), and the valve opening drive plunger 9 and the valve body 5 are released.

A compression coil spring 20 is provided between the suction element 11 and the retainer 18, and the compression coil spring 20 is provided.
Urges the retainer 18 and the ball 19 downward in the drawing. As a result, the ball 19 is locked. A retainer 21 is provided between the tapered inner peripheral surface 13 of the tapering member 14 and the straight outer peripheral surface 17 of the stem portion 8.
Thus, a plurality of balls 22 are arranged. Ball 2
Reference numeral 2 allows the valve body 5 to move in the valve opening direction, that is, ascends by engaging with the tapered inner peripheral surface 13, and prohibits the valve body 5 to move in the valve closing direction, that is, the descending movement. Performs a check function.

The retainer 21 is a valve closing drive plunger 10.
And the valve-closing drive plunger 10 moves upward against the spring force of the compression coil spring 23 to move the ball 2
2 is lifted to forcibly cancel the check function of the ball 22. That is, the check means is forcibly released. Further, the lock release ring member 24 is attached to the valve closing drive plunger 10.
The lock release ring member 24 lifts the ball 19 together with the retainer 18 by the upward movement of the valve closing drive plunger 10 to forcibly release the one-way connecting means by the ball 19.

An upper piece 27 of a yoke 26 is fixedly connected to the upper end of the suction element 11 by a nut 25. The yoke 26 is arranged in a lateral U-shape to cover one side of the plunger holding tube 7, and is located at a height position substantially corresponding to the position where the valve opening drive plunger 9 is arranged in the plunger holding tube 7. It has a lower piece 28.

An upper piece 27 and a lower piece 28 of the yoke 26.
A direct current type electromagnetic coil 29 is fixedly arranged between and to surround the plunger holding tube 7. A permanent magnet 30 is connected and attached to the lower surface of the lower piece 28 with an N pole, and a magnetic pole piece 31 is connected and attached to the S pole below the permanent magnet 30. The magnetic pole piece 31 is arranged at a height position substantially corresponding to the arrangement position of the valve closing drive plunger 10 in the plunger holding tube 7.

In the electromagnetic coil 29, when the current is applied in the first direction (hereinafter referred to as the forward direction), the yoke 26 is in the direction opposite to the magnetic pole direction of the permanent magnet 30, and the first magnetic pole direction indicated by the solid arrow in FIG. Is excited to drive the valve opening drive plunger 9 upward,
A second magnetic pole direction indicated by a broken line arrow in FIG. 1 in which the yoke 26 is in the same direction as the magnetic pole direction of the permanent magnet 30 by energization in a second direction (hereinafter, referred to as a reverse direction) opposite to the first direction. To drive the valve closing drive plunger 10 upward.

Next, the operation of the step flow rate control valve having the above construction will be described. In the steady state in which the electromagnetic coil 29 is not energized, each member is located at the arrangement position shown in FIG. 1 by the spring force of each spring 12, 20, 23. In this steady state, when the electromagnetic coil 29 is energized in the forward direction, the yoke 26 is excited in the first magnetic pole direction shown by the solid line arrow in FIG. 1, and the magnetic circuit shown by the solid line arrow is generated. Composed. As a result, the valve-opening drive plunger 9 moves upward against the spring force of the compression coil spring 20, magnetically attracts the suction element 11, and is positioned at the rising position. By this upward movement, the ball 19 in the locked state lifts the valve body 5 against the spring force of the return spring 12. The ball 22 having the check function is loosened from the engagement with the tapered inner peripheral surface 13 by the movement of the valve body 5 in the valve opening direction.
Since the valve body 5 is freely allowed to move in the valve opening direction, the ball 22 does not hinder the movement of the valve element 5 in the valve opening direction.

As a result, the valve body 5 moves to open the valve by one step. Forward energization to the electromagnetic coil 29 may be stopped when the valve opening drive plunger 9 is magnetically attracted to the suction element 11. That is, the forward energization of the electromagnetic coil 29 may be a momentary energization of several milliseconds.

When the forward power supply to the electromagnetic coil 29 is stopped, the valve opening drive plunger 9, retainer 18 and ball 19 are released by the spring force of the compression coil spring 20. During this descent, the ball 19 is in the released state and the non-return action of the ball 22 causes the valve element 5 to move.
Keeps its position at the valve opening position where it is opened for one step without moving downward.

As a result, the valve opening for one step of the valve body 5 is completed. After that, every time the electromagnetic coil 29 is momentarily energized in the forward direction, the valve body 5 moves by one step to open, and the valve opening amount increases by one step.
If the electromagnetic coil 29 is energized in the forward direction when the valve body 5 repeats the valve opening movement several times and reaches the valve opening upper limit position,
Is raised by one step, but at this time, if a step 5a is provided on the lower portion of the straight outer peripheral surface of the valve body 5, the valve body 5 is lifted to lift the ball 22 together with the retainer 21, and the check action by the ball 22 is forced. 5 to be released automatically
Is not locked at the position raised by one step, and when energization is stopped, the valve returns to the original valve opening upper limit position together with the valve opening drive plunger 9.

When the electromagnetic coil 29 is energized in the reverse direction, the yoke 26 is excited in the direction of the second magnetic pole indicated by the broken line arrow in FIG. 1 to form the magnetic circuit indicated by the broken line arrow. As a result, the valve opening drive plunger 9 moves upward against the spring force of the compression coil spring 20 to move the suction element 1
1, the valve closing drive plunger 10 also moves upward against the spring force of the compression coil spring 23.

As a result, the ball 2 is held together with the retainer 21.
2 is lifted to forcibly release the non-return action of the ball 22, and the lock release ring member 24 lifts the ball 19 together with the retainer 18 to lift the ball 19.
The one-way connection means is forcedly released. As a result, the valve element 5 is brought into a free state, and the spring force of the return spring 12 causes the valve element 5 to suddenly return to the maximum valve closing position.

Even when the reverse energization to the electromagnetic coil 29 is stopped after the valve is closed, the magnetic force of the permanent magnet 30 keeps both the valve opening drive plunger 9 and the valve closing drive plunger 10 moving upward. At this time, a voltage is applied to the electromagnetic coil 29 in the forward direction at a voltage low enough to cancel the magnetic force of the permanent magnet 30 or for a short period of time, and the magnetic force of the permanent magnet 30 acting on the valve opening drive plunger 9 and the valve closing drive plunger 10 is applied. Is canceled, and the valve opening drive plunger 9 and the valve closing drive plunger 10 are returned to their original positions.

FIG. 3 shows a second embodiment of the step flow control valve according to the present invention. In the second embodiment, the same parts as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. This also applies to each of the following embodiments.

In the second embodiment, the lowering position of the valve opening drive plunger 9 is replaced by the plunger support pin 15, and the step portion 32 is formed in the middle portion of the plunger holding tube 7.
Other than this, the configuration is substantially the same as that of the first embodiment.

Therefore, the step flow rate control valve of the second embodiment opens and closes by substantially the same operation as the step flow rate control valve of the first embodiment. As a modification of the first embodiment, a plunger support ring may be provided on the outer circumference of the valve closing drive plunger 10 instead of the plunger support pin 15.

FIG. 4 shows a third embodiment of the step flow rate control valve according to the present invention. In the third embodiment, another permanent magnet 33 and a magnetic pole piece 34 are fixedly arranged between the lower piece portion 28 and the electromagnetic coil 29 with the same magnetic pole direction as the permanent magnet 30, and the magnetic pole piece 34 is It is located at a height position substantially corresponding to the position where the valve opening drive plunger 9 is arranged in the plunger holding tube 7.

In this case, in the electromagnetic coil 29, the yoke 26 is in the same direction as the magnetic pole direction of the permanent magnet 33 by the forward energization, but in the direction opposite to the magnetic pole direction of the permanent magnet 31, the first arrow indicated by the solid line arrow in FIG. 4, the valve-opening drive plunger 9 is driven to rise, and the reverse direction energization moves the yoke 26 in the same direction as the magnetic pole direction of the permanent magnet 30 and in the opposite direction to the magnetic pole direction of the permanent magnet 33 in FIG. The valve closing drive plunger 10 is driven upward by being excited in the direction of the second magnetic pole indicated by the broken line arrow.

The valve closing drive plunger 10 is arranged below the tapering member 14, and the valve closing drive plunger 10 is integrally formed with a striker 10a for pushing up the retainer 21. As shown in FIG. 5, the taper ring member 14 is supported by a plunger support pin 15 arranged through the valve closing drive plunger 10 to determine its descending position, and the retainer 21 is opened in sequence. The descent position of the valve drive plunger 9 is determined.

In FIG. 4, reference numerals 35, 36 and 37 are spring retainers. In the third embodiment as well, as in the first embodiment, the valve coil 5 is opened one step at a time when the electromagnetic coil 29 is energized in the forward direction, and the electromagnetic coil 29 is energized in the reverse direction. As a result, the valve body 5 moves to the maximum valve closing position at once.

FIG. 6 shows a fourth embodiment of the step flow rate control valve according to the present invention. In the fourth embodiment, the taper ring member 14 is fixed to the middle portion of the plunger holding tube 7 by the caulking portion 7a. A ball support member 40 is integrally provided on the tapering member 14, and the ball support member 40 positions the ball 19 at the release position in a steady state.

The permanent magnet 30 is the plunger holding tube 7
It is fixedly placed at the bottom of the inside. Valve drive plunger 1
0 is urged downward by the compression coil spring 39, that is, toward the permanent magnet 30 side, and when the electromagnetic coil 29 is energized in the forward direction, 0 is positioned at the lowered position by the spring force of the compression coil spring 39. When the electromagnetic coil 29 is energized in the reverse direction, magnetic repulsion with the permanent magnet 30 causes upward movement against the spring force of the compression coil spring 39, and the ball 2
2 is lifted to forcibly cancel the check function of the ball 22.

The retainer 18 of the ball 19 is omitted, and as shown in FIG. 7, a plurality of balls 19 are arranged around the stem portion 8 and a compression coil spring 20 of the compression coil spring 20 is provided via a ring-shaped spring retainer 41. Spring force is exerted. Further, the retainer 21 of the ball 22 is also omitted, and a plurality of balls 41 are arranged around the stem portion 8 and the spring force of the compression coil spring 23 is exerted via the ring-shaped spring retainer 42.

In the fourth embodiment, when the electromagnetic coil 29 is energized in the forward direction, the valve opening drive plunger 9 moves upward, and the ball 19 is sandwiched between the valve opening drive plunger 9 and the stem portion 8 and locked. The valve body 5 moves to open the valve as the valve-opening drive plunger 9 moves upward. Therefore, in this case as well, the valve body 5 is opened one step at a time when the electromagnetic coil 29 is energized in the forward direction.

When the electromagnetic coil 29 is energized in the reverse direction when the valve is closed, the valve-closing drive plunger 10 moves the permanent magnet 30.
The magnetic repulsion causes the upward movement of the compression coil spring 39 against the spring force of the compression coil spring 39, lifting the ball 22 and forcibly canceling the check action of the ball 22. As a result, the valve body 5 is
The free state is reached, and the spring force of the return spring 12 returns the valve to the maximum valve closing position at once.

FIG. 8 shows a fifth embodiment of the step flow control valve according to the present invention. In the fifth embodiment, a linear ratchet mechanism is used as the check means. This linear ratchet mechanism includes ratchet teeth 43 formed on the outer peripheral surface of the stem portion 8 of the valve body 5 and a ratchet pawl member 4 provided in the plunger holding tube 7 so as to be radially movable.
4 and the ratchet pawl member 44 is displaced to the right in FIG. 8 so that the ratchet pawl 45 holds the ratchet teeth 43.
And non-return engagement with the valve body 5 to allow the valve body 5 to move in the valve opening direction.
Only movement in the valve closing direction of is prohibited. A plurality of ratchet teeth 43 are formed in the axial direction of the stem portion 8 at intervals corresponding to the valve lift amount for one step of the valve body 5, and the ratchet pawl 45 selectively engages with one of the ratchet pawls 45 in a non-return manner. .

A permanent magnet 46 is fixedly attached to the outer peripheral portion of the plunger holding tube 7 corresponding to the arrangement portion of the ratchet pawl member 44. The ratchet pawl member 44 is a permanent magnet 4
Due to the relationship between the magnetic pole direction of 6 and the magnetization direction of the electromagnetic coil 29, when the electromagnetic coil 29 is energized in the forward direction, the ratchet pawl 45 moves to the right in FIG. 8 and the ratchet pawl 45 engages with the ratchet tooth 43. When the electromagnetic coil 29 is located at the engagement position and the reverse direction is energized, it moves to the left in FIG. 8 from the ratchet engagement position and the ratchet pawl 45 is separated from the engagement with the ratchet teeth 43. Located in.

In the fifth embodiment, when the electromagnetic coil 29 is energized in the forward direction, the valve opening drive plunger 9 moves upward, and the ball 19 is locked between the valve opening drive plunger 9 and the stem portion 8. Then, the valve body 5 moves to open the valve as the valve-opening drive plunger 9 moves upward, and the ratchet pawl member 44 moves to the right in FIG.
5 engages with one of the ratchet teeth 43 in a non-return manner to prevent the valve body 5 from moving in the valve closing direction.

Therefore, in this case as well, the valve body 5 is opened by one step when the electromagnetic coil 29 is energized in the forward direction. When the electromagnetic coil 29 is energized in the reverse direction when the valve is closed, the ratchet pawl member 44 moves leftward in FIG. 8 from the ratchet engagement position, and the ratchet pawl 45 is separated from the engagement with the ratchet teeth 43. As a result, the valve body 5 becomes free, and the spring force of the return spring 12 causes the valve body 5 to return to the maximum valve closing position at once.

FIG. 9 shows another embodiment of the one-way connecting means. In this embodiment, instead of the ball 19, a tapered grooved tapered ring member 49 having a tapered outer peripheral surface 48 that fits into the tapered inner peripheral surface 16 is used. Performs substantially the same action.

FIG. 10 shows a sixth embodiment of the step flow control valve according to the present invention. The sixth embodiment is a modification of the fifth embodiment. In this embodiment, a return spring 47 for the valve opening drive plunger 9 is additionally provided in accordance with a change in the arrangement position of the ball 19 and the compression coil spring 20. .

Other than this, the step flow control valve of the sixth embodiment is opened and closed by substantially the same operation as the step flow control valve of the fifth embodiment because it is substantially the same as the fifth embodiment. . FIG. 11 shows a seventh embodiment of the step flow rate control valve according to the present invention.

In the seventh embodiment, a spring type ratchet pawl member 50 made of sheet metal having a shape as shown in FIG. 12 is used, and the ratchet pawl member 50 is a ratchet tooth 43 of the valve body 5. It has a ratchet pawl 51 which is engaged in a non-return manner. When the electromagnetic coil 29 is energized in the forward direction due to the relationship between the magnetic pole direction of the permanent magnet 30 and the magnetizing direction of the electromagnetic coil 29, the valve closing drive plunger 10 together with the permanent magnet 30 of the compression coil spring 39 in FIG. When the electromagnetic coil 29 is reversely energized in response to the upward displacement against the spring force, the spring force of the compression coil spring 39 moves downward together with the permanent magnet 30 to move the ratchet pawl member 50 with the taper portion 10a. The ratchet pawl 51 is pushed apart and separated from the engagement with the ratchet teeth 43.

In the seventh embodiment, when the electromagnetic coil 29 is energized in the forward direction, the valve opening drive plunger 9 moves upward, and the ball 19 is locked between the valve opening drive plunger 9 and the stem portion 8. The valve body 5 moves to open the valve as the valve opening drive plunger 9 moves upward, and the valve closing drive plunger 10 moves upward together with the permanent magnet 30 to move away from the ratchet pawl member 50. 51 engages with one of the ratchet teeth 43 in a non-return manner to prevent the valve body 5 from moving in the valve closing direction.

Therefore, also in this case, the valve body 5 is opened one step at a time when the electromagnetic coil 29 is energized in the forward direction. When the electromagnetic coil 29 is energized in the reverse direction when the valve is closed, the valve closing drive plunger 10 moves down together with the permanent magnet 30, and the taper portion 10a moves to the ratchet pawl member 50.
To spread the ratchet claw 51 away from the engagement with the ratchet teeth 43. As a result, the valve body 5 becomes free, and the spring force of the return spring 12 causes the valve body 5 to return to the maximum valve closing position at once.

FIG. 13 shows an eighth embodiment of the step flow rate control valve according to the present invention. In the eighth embodiment, a lateral slide type ratchet pawl member 5 having a ratchet pawl 52 is provided.
3 is used. The ratchet pawl member 53 is guided by the guide member 54 (see FIG. 14) and the ratchet pawl 52 is engaged with the ratchet teeth 43 in a non-return engagement position and the ratchet pawl 52.
Is movable to and from a release position separated from the engagement with the ratchet teeth 43, and is biased to the engagement position by the spring force of a leaf spring 55 provided in the valve closing drive plunger 10.

The valve closing drive plunger 10 has a cam piece 56.
Is extended, and the ratchet claw member 53 is moved to the release position against the spring force of the leaf spring 55 by the upward movement of the cam piece portion 56. In the eighth embodiment, when the electromagnetic coil 29 is energized in the forward direction, the valve opening drive plunger 9 moves upward, and the ball 19 is sandwiched between the valve opening drive plunger 9 and the stem portion 8 to be in the locked state. The valve body 5 moves to open the valve with the upward movement of the valve opening drive plunger 9, and at this time, the ratchet pawl member 5 is moved by the spring force of the leaf spring 55.
The ratchet claw 52 is
Engages with the ratchet teeth 43 in a non-return manner to prevent the valve body 5 from moving in the valve closing direction.

Therefore, in this case as well, the valve body 5 is opened by one step when the electromagnetic coil 29 is energized in the forward direction. When the electromagnetic coil 29 is energized in the reverse direction when the valve is closed, the valve opening drive plunger 9 and the valve closing drive plunger 10 move upward, and the cam piece portion 56 causes the ratchet pawl member 53 to resist the spring force of the leaf spring 55. And move it to the release position. As a result, the ratchet pawl 52 is separated from the engagement with the ratchet teeth 43, and the valve body 5 becomes free so that the return spring 12
The spring force of returns to the maximum valve closing position at once.

FIG. 15 shows a ninth embodiment of the step flow rate control valve according to the present invention. In the ninth embodiment, a collet chuck 57 as shown in FIG. 16 is used as the non-return means. The collet chuck 57 is
It has a tapered outer peripheral surface 59 that fits into the tapered inner peripheral surface 58 formed on the valve body 1, and is biased toward the tapered inner peripheral surface 58 by the spring force of the compression coil spring 23, so that the valve body 5 When the valve moves in the valve opening direction, it moves upward to displace upward so as to release the chucking of the valve body 5, and in a steady state, the tapered outer peripheral surface 59 is generated by the spring force of the compression coil spring 23. The valve body 5 is pressed against the tapered inner peripheral surface 58.
Is engaged and the movement of the valve body 5 in the valve closing direction is prohibited.

The collet chuck 57 is connected to the valve closing drive plunger 10 and is displaced upward by the upward movement of the valve closing drive plunger 10 to release the chucking of the valve body 5. In the ninth embodiment, when the electromagnetic coil 29 is energized in the forward direction, the valve-opening drive plunger 9 moves upward, and the ball 19 is sandwiched between the valve-opening drive plunger 9 and the stem portion 8 to be in the locked state. The valve body 5 moves to open as the valve-opening drive plunger 9 moves upward.

Since the collet chuck 57 freely allows the valve opening movement of the valve body 5, the opening movement of the valve body 5 is not obstructed by the collet chuck 57, and the valve body 5
Is prevented from moving in the valve closing direction by the non-return chucking action of the collet chuck 57 and is held in the valve opening position.

Therefore, in this case as well, the valve body 5 is opened by one step by forward energization of the electromagnetic coil 29. When the electromagnetic coil 29 is energized in the reverse direction at the time of valve closing, the valve opening drive plunger 9 and the valve closing drive plunger 10 move upward, and the collet chuck 57 is forcibly separated from the tapered inner peripheral surface 58, It will be released. As a result, the valve body 5 becomes free and the return spring 12
The spring force of returns to the maximum valve closing position at once.

FIG. 17 shows a tenth embodiment of the step flow control valve according to the present invention. The tenth embodiment is a modification of the ninth embodiment. In this embodiment, a tapered grooved tapered ring member 49 is used in place of the ball 19. Except for this, the step flow rate control valve of the tenth embodiment is opened and closed by substantially the same operation as the step flow rate control valve of the ninth embodiment.

[0061]

As can be understood from the above description, according to the step flow rate control valve of the present invention, the valve element is opened step by step every time the electromagnetic coil of the magnetic drive means is energized in the first direction. Since the valve moves and is mechanically firmly held by the check means at each valve open position, the valve open state is reliably maintained, and highly reliable flow rate control is performed.

Further, since it is not necessary to continuously energize the electromagnetic coil in order to maintain the valve open state, the power consumption is small,
Power saving is achieved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a step flow rate control valve according to the present invention.

FIG. 2A is a side view of the ball retainer, and FIG. 2B is a side view of the ball retainer.

FIG. 3 is a sectional view showing a second embodiment of the step flow rate control valve according to the present invention.

FIG. 4 is a sectional view showing a third embodiment of the step flow rate control valve according to the present invention.

FIG. 5 is a plan view of a valve closing drive plunger portion in the third embodiment.

FIG. 6 is a sectional view showing a fourth embodiment of the step flow rate control valve according to the present invention.

FIG. 7A is an enlarged side view of a ball arrangement portion for one-way connection, and FIG. 7B is a plan view of the same.

FIG. 8 is a sectional view showing a fifth embodiment of the step flow rate control valve according to the present invention.

9A is an enlarged side view of an arrangement portion of a tapered grooved tapered ring member for one-way connection, and FIG. 9B is a perspective view of the tapered grooved tapered ring member.

FIG. 10 is a sectional view showing a sixth embodiment of the step flow rate control valve according to the present invention.

FIG. 11 is a sectional view showing a seventh embodiment of the step flow rate control valve according to the present invention.

12A is a side view of a ratchet pawl member used in the seventh embodiment, FIG. 12B is a front view of the ratchet pawl member, and FIG. 12C is a plan view of the ratchet pawl member.

FIG. 13 is a sectional view showing an eighth embodiment of the step flow rate control valve according to the present invention.

FIG. 14 is a plan view of a ratchet mechanism portion according to an eighth embodiment.

FIG. 15 is a sectional view showing a ninth embodiment of the step flow rate control valve according to the present invention.

FIG. 16 is a perspective view showing an embodiment of a collet chuck.

FIG. 17 is a sectional view showing a tenth embodiment of a step flow rate control valve according to the present invention.

[Explanation of symbols]

 1 Valve Body 4 Valve Seat 5 Valve Body 7 Plunger Holding Tube 9 Valve Opening Drive Plunger 10 Valve Closing Drive Plunger 11 Suction Element 12 Return Spring 14 Tapering Ring Member 11 Suction Element 19, 22 Ball 24 Lock Release Ring Member 26 Yoke 29 Electromagnetic Coil 30,31 Permanent magnet 40 Ball support member 43 Ratchet tooth 44 Ratchet pawl member 46 Permanent magnet 49 Tapered ring member with split groove 50,53 Ratchet pawl member 55 Leaf spring 56 Cam piece 57 Collet chuck

Claims (10)

[Claims] 1. A valve body having a valve seat portion, a valve body that axially moves with respect to the valve body to control the flow rate in cooperation with the valve seat portion, and the valve body is closed. A return spring that urges in the direction, a valve opening drive plunger that is provided movably in the valve opening and closing valve direction, and is provided between the valve opening drive plunger and the valve body,
When the valve opening drive plunger moves in the valve opening direction, the valve opening drive plunger and the valve body are brought into a locked state, and when the valve opening drive plunger moves in the valve closing direction, the valve opening drive plunger and the valve body move. One-way connection means that is in a released state that allows relative displacement, check means that allows movement of the valve element in the valve opening direction and prohibits movement of the valve element in the valve closing direction, electromagnetic coil and permanent magnet Composed of and
Driving the valve opening drive plunger in the valve opening direction by energizing the electromagnetic coil in a first direction, and energizing the electromagnetic coil in a second direction opposite to the first direction, the one-way connecting means and And a magnetic drive means for forcibly releasing the check means into a free state of the valve body, and a step flow control valve. 2. The one-way connecting means is constituted by a ball arranged between a tapered inner peripheral surface formed on the first plunger and a straight outer peripheral surface of the valve body. The step flow control valve according to claim 1. 3. The one-way connecting means is configured by a tapered groove member with a split groove arranged between a tapered inner peripheral surface formed on the first plunger and a straight outer peripheral surface of the valve body. The step flow control valve according to claim 1, wherein: 4. The valve body is movably provided between a first position and a second position, and when the valve is located at the second position, the check means is forcibly released. It has a valve-closing plunger to be in a free state, and the valve-closing plunger is driven to the second position by energizing the electromagnetic coil of the magnetic drive means in the second direction. The step flow control valve according to any one of claims 1 to 3, which is characterized. 5. The one-way connection means restrains the movement of the valve body in the valve closing direction with respect to the valve opening drive plunger regardless of whether the electromagnetic coil is energized or not, and the valve closing plunger is the The step flow control valve according to claim 4, wherein the one-way connection means is forcedly released in addition to the forced release of the check means by being driven to the second position. 6. The valve element driven by energization in a first direction when the valve element reaches the valve opening upper limit, releases the check means and returns to the valve opening upper limit position when the energization is stopped. 5. The step flow rate control valve according to claim 1. 7. The check means comprises a ball arranged between a tapered inner peripheral surface of a taper ring member arranged on the valve body side and a straight outer peripheral surface of the valve body. The step flow rate control valve according to any one of claims 1 to 6, which is characterized. 8. The non-return means is constituted by a ratchet pawl that non-returnly engages with ratchet teeth formed on the outer peripheral surface of the valve body. Step flow control valve. 9. The collet, wherein the check means is axially movably fitted to an outer peripheral portion of the valve body, and is brought into a fastening state by engaging with a tapered inner peripheral surface formed on the valve body side. It is constituted by a chuck.
7. The step flow rate control valve according to any one of to 6. 10. A lower portion of a straight outer peripheral surface of the valve body for forcibly releasing the check means when the valve body reaches a predetermined opening degree to prevent the valve opening degree from further increasing. 8. The step flow rate control valve according to claim 1, further comprising a step for forcibly releasing the check means.