JPH07310850A - Step flow rate control valve - Google Patents

Abstract

PURPOSE:To eliminate a need to be continuously electrically connected to an electromagnetic coil to maintain an operation state. CONSTITUTION:During an ordinary state wherein an electromagnetic coil 25 is not energized, a valve body 5 is positioned to a minimum opening position through the spring force of a return spring 12. A yoke 18 and permanent magnets 20 and 21 are arranged so that by applying forward energization on the electromagnetic coil 25, the valve body 5 is positioned in an intermediate opening position and by applying reverse energization on the electromagnetic coil 25. the valve body is positioned in a maximum opening position. Even when energization to the electromagnetic coil 25 is stopped, the valve body 5 is self-held in an intermediate opening position or a maximum opening position and the valve body 5 is maintained so that it is positioned in the opening position.

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 three-position type step flow rate control valve that performs refrigerant flow rate control and evaporation pressure control in three stages in a refrigeration cycle.

[0002]

2. Description of the Related Art A three-position type step flow rate control valve for controlling the throttle flow rate control and the evaporation pressure control of a refrigerant in three stages in a refrigeration cycle such as an air conditioner is disclosed in Japanese Utility Model Publication No. 32945. As shown in FIG. 31, this step flow rate control valve uses a two-stage spring structure including springs 101 and 102, and controls the current value given to the electromagnetic coil 103 in three stages of zero, small, and large. As a result, the exciting force of the electromagnetic coil 103 and the spring force of the two-stage spring structure are balanced so that the valve body 104 can be divided into a minimum valve opening position (including a fully closed position), an intermediate valve opening position, and a maximum valve opening position. It is located in the alternative position.

Regarding this step flow rate control valve,
If a more detailed explanation is required, please refer to Japanese Utility Model Publication No. 32945/1990.

[0004]

The above-mentioned step flow rate control valve is a step flow rate control valve for performing flow rate control in three or more stages, for example, JP-A-3-113183 and JP-A-3-113183.
Compared with the step flow control valve disclosed in Japanese Patent No. 113184 and Japanese Patent Laid-Open No. 4-340356, the structure and energization control are simpler and the intended purpose is achieved, but the intermediate valve opening position or the maximum open position is achieved. In order to maintain the position of the valve body at the valve position, it is necessary to continuously energize the electromagnetic coil with a small and large predetermined current value. This causes a large amount of power consumption, which is especially problematic when the power source is a battery power source in an automobile or the like.

Further, since it is necessary to maintain the current value supplied to the electromagnetic coil at a predetermined value in order to maintain the predetermined valve open state, the stability of the power supply circuit becomes a problem, and if the current value fluctuates, the valve open There is a problem that the state is not guaranteed. The present invention has been made by focusing on the above-mentioned problems, and it is not necessary to continuously energize the electromagnetic coil to maintain the valve open state, and the valve is required without quantitative control of the current value. (EN) Provided is a step flow control valve capable of selectively positioning the body in three positions of a minimum valve opening position, an intermediate valve opening position and a maximum valve opening position with high reliability and without complicating the structure. It is an object.

[0006]

In order to achieve the above-mentioned objects, a step flow control valve according to the present invention cooperates with a valve body and a valve seat portion by axially moving with respect to the valve body. A valve body for controlling the flow rate, a return spring for urging the valve body in the valve closing direction to position the valve body at the first opening position, and a first position in the moving direction of the valve body. It is movably arranged between the second position and the second position to engage with the valve body to move the valve body from the first opening position to the valve opening side. A first plunger located at the second opening position of the first plunger and between the third position and the fourth position in the moving direction of the valve body in series in the moving direction of the first plunger and the valve body. Is movably disposed on the valve body and moves from the third position to the fourth position to engage with the valve body and A second plunger to position the body to a third opening position of the opening side of the second opening position,
A suction element fixedly arranged facing the end surface of the first plunger on the second position side, a yoke having one end connected to the suction element, and the first plunger at the second position. A first permanent magnet that, when positioned, forms a magnetic closed loop with the first plunger, the attractor, and the yoke to latch the first plunger in the second position; and the first plunger. Is located at the second position and the second plunger is located at the fourth position to form a magnetic closed loop by the second plunger, the first plunger, the attractor and the yoke. The second permanent magnet for latching the second plunger in the fourth position, and the second permanent magnet in the same direction as the magnetic pole direction of the first permanent magnet by energizing in the first direction. Of magnet The yoke is magnetized in a first magnetic pole direction opposite to the pole direction to drive the first plunger to the second position, and to energize the yoke by energizing in a second direction opposite to the first direction. Electromagnetic for exciting the second plunger to the fourth position by exciting in a second magnetic pole direction opposite to the magnetic pole direction of the first permanent magnet and in the same direction as the magnetic pole direction of the second permanent magnet. It is characterized by having a coil.

In order to achieve the above-mentioned object, the step flow rate control valve according to the present invention cooperates with the valve body and the valve seat portion by moving in the axial direction with respect to the valve body to control the flow rate. A valve body for performing, a return spring for urging the valve body in the valve closing direction to position the valve body at the first opening position, and a first position and a second position in the moving direction of the valve body. Movably disposed between the first position and the second position to engage the valve body to open the valve body from the first opening position to the second opening side on the valve opening side. A first plunger located at a degree position, and arranged so as to be movable in series in the moving direction of the first plunger and the valve body between a third position and a fourth position in the moving direction of the valve body. By moving from the third position to the fourth position, the valve body is engaged to move the valve body to the first position. A second plunger located at a third opening position on the valve opening side from the opening position, and a suction element fixedly arranged facing the end surface on the second position side of the first plunger, A yoke having one end connected to the suction element, the first plunger located at the second position, and the second plunger located at the fourth position, whereby the second plunger and the second plunger are located. The second plunger is latched in the fourth position by forming a magnetic closed loop with the one plunger, the suction element, and the yoke, or the first plunger is located in the second position, A permanent magnet that forms a magnetic closed loop with the first plunger, the attractor, and the yoke to latch the first plunger in the second position, and the yoke is extended by energizing in the first direction. The first plunger is excited in a direction opposite to the magnetic pole direction of the magnet to drive the first plunger to the second position, and the second direction opposite to the first direction is energized to cause the current to flow. The yoke is excited in the second magnetic pole direction that is the same as the magnetic pole direction of the permanent magnet to drive the second plunger to the fourth position, or the yoke is moved to the permanent magnet by energizing in the first direction. The first plunger is excited in the same magnetic pole direction as the magnetic pole direction to drive the first plunger to the second position, and the yoke is moved by energizing in a second direction opposite to the first direction. An electromagnetic coil for exciting the second plunger to the fourth position by exciting in a second magnetic pole direction opposite to the magnetic pole direction of the first permanent magnet is provided.

The step flow control valve according to the present invention is
In addition to the above-described structure, an intermediate spring is provided between the first plunger and the second plunger to bias the two plungers in a direction in which they are separated from each other with a spring force weaker than the spring force of the return spring. May be.

In the step flow rate control valve according to the present invention, the valve body is a first valve body driven by the first plunger and a second valve body having a hollow structure driven by the second plunger. The first valve body cooperates with the first valve seat formed on the second valve body to control the flow rate, and the second valve body is formed on the valve body. The flow rate control may be performed in cooperation with the second valve seat portion.

Further, in the step flow rate control valve according to the present invention, the suction element may be provided with a bear removing coil.

[0011]

According to the above-described structure, in the normal state where the electromagnetic coil is not energized, the spring force of the return spring causes the valve element to be positioned at the first opening position, which is the minimum valve opening position. The valve body is positioned at the second opening position, which is the intermediate valve opening position, due to the energization in the first direction, and the electromagnetic coil is energized in the second direction opposite to the first direction. As a result, the valve body is located at the third opening position which is the maximum valve opening position.

The valve body is self-held at the second opening position or the third opening position by the magnetic force of the permanent magnet even when the energization of the electromagnetic coil is stopped, and the second opening position or the third opening position is maintained. It is maintained at the opening position of. Further, when the intermediate spring is provided between the first plunger and the second plunger, rattling of the first plunger and the second plunger is avoided.

Further, when the valve body has a double structure consisting of the first valve body and the second valve body, the flow rate at the second opening position and the flow rate at the third opening position are reliable. And it is set accurately. If the suction element is provided with a bear removing coil, the first plunger may temporarily leave the second position when the valve body is moved from the second opening position to the third opening position. Is avoided.

[0014]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 1 to 3 show a first embodiment of a step flow rate 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, 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 metering section 6 at the tip end that cooperates with the valve seat section 4 to control the flow rate, and has a minimum flow rate position (first opening position) shown in FIG. It reciprocates between the intermediate flow rate position (second opening position) shown in FIG. 2 and the maximum flow rate position (third opening position) shown in FIG.

A plunger holding tube 7 is fixedly attached to 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. A lower plunger (second plunger) 9 and an upper plunger (first plunger) 10 each having a hollow structure are fitted and loaded in the plunger holding tube 7 so as to be movable in series in the moving direction of the valve body 5. . A suction element 11 is fixedly attached to the upper end of the plunger holding tube 7, and the lower bottom surface of the suction element 11 is attached to the upper plunger 1.
It faces the upper end surface of 0 at a predetermined interval.

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 minimum flow rate position. The upper plunger 10 is movable between a descending position (first position) shown in FIG. 1 and an ascending position (second position) in contact with the suction element 11 as shown in FIG. Yes, the lower plunger 9 is in the lowered position (third position) shown in FIG. 1 and in the raised position (fourth position) where it abuts the upper plunger 10 which is located in the raised position as shown in FIG. Position) and can be moved.

The stem portion 8 of the valve body 5 is fitted in the hollow portions of the lower plunger 9 and the upper plunger 10 so as to be relatively displaceable in the axial direction, and the stem portion 8 has a step formed on the upper plunger 10. Flange portion 14 engaging with the portion 13
And a step portion 16 that engages with a step portion 15 formed on the lower plunger 9.

The upper plunger 10 moves from the lowered position to the raised position, whereby the step portion 13 and the flange portion 14 are moved.
By engaging with the valve body 5, the valve body 5 is reversibly moved from the minimum flow rate position to the intermediate flow rate position against the spring force of the return spring 12, and the lower plunger 9 is moved from the lowered position to the raised position, whereby the step portion 15 is moved. The engagement of the valve elements 16 and 16 causes the valve element 5 to reversibly move from the intermediate flow rate position to the maximum flow rate position against the spring force of the return spring 12.

An upper piece 18a of a yoke 18 is fixedly connected to the upper end of the suction element 11 by a bolt 17. The yoke 18 is arranged in a lateral U-shape so as to cover one side of the plunger holding tube 7 and is located at a height position substantially corresponding to an arrangement position of the lower plunger 9 in the plunger holding tube 7. It has a portion 18b.

An upper permanent magnet (first permanent magnet) 20 is connected and mounted with an S pole on the upper surface of the lower piece 18b.
A lower permanent magnet (second permanent magnet) 21 is connected and attached to the lower surface with an N pole. An upper pole piece 23 is connected and attached to the N pole of the upper permanent magnet 20 and a lower pole piece 24 is connected to and attached to the S pole of the lower permanent magnet 21, respectively.
A DC electromagnetic coil 25 is fixedly disposed between the upper holding portion 18a and the upper piece portion 18a so as to surround the plunger holding tube 7.

As shown in FIG. 2, the upper permanent magnet 20 has the upper plunger 10, the suction element 11, and the yoke 18 when the upper plunger 10 is located at the raised position.
To form a magnetic closed loop (indicated by an outlined arrow in the figure) to latch the upper plunger 10 in the raised position.

As shown in FIG. 3, the lower permanent magnet 21 has the lower plunger 9, the upper plunger 10, the suction element 11 and the lower plunger 9 when the upper plunger 10 and the lower plunger 9 are both located in the raised position. A magnetic closed loop (shown by an outlined arrow in the figure) is formed by the yoke 18 and the lower plunger 9 is latched in the raised position.

The electromagnetic coil 25 moves the yoke 18 to the upper permanent magnet 2 by energizing in the first direction (hereinafter, referred to as forward direction).
In the same direction as the magnetic pole direction of 0, but in the direction opposite to the magnetic pole direction of the lower permanent magnet 21, the upper magnetic pole 10 is excited to the first magnetic pole direction shown by the solid arrow in FIG. When the current is applied in a second direction opposite to the one direction (hereinafter, referred to as a reverse direction), the yoke 18 is moved in a direction opposite to the magnetic pole direction of the upper permanent magnet 20 and in the same direction as the magnetic pole direction of the lower permanent magnet 21. The lower plunger 9 is driven to the raised position by exciting in the second magnetic pole direction indicated by the broken line arrow in FIG.

A bear removing coil 26 forming a short-circuiting ring is fixedly attached to the lower bottom surface of the suction element 11. Next, the operation of the step flow rate control valve configured as described above will be described.
In the normal state in which the electromagnetic coil 25 is not energized, as shown in FIG. 1, the valve body 5 is located at the minimum flow position, which is the most lowered position, due to the spring force of the return spring 12.

In this normal state, when the electromagnetic coil 25 is energized in the forward direction, the yoke 18 is excited in the first magnetic pole direction shown by the solid arrow in FIG. A circuit is constructed, which allows the upper plunger 1
0 moves upward and is magnetically attracted to the suction element 11, and comes to be positioned at the rising position. Due to this movement, the valve body 5 is lifted up against the spring force of the return spring 12 and is positioned at the intermediate flow rate position shown in FIG.

In this state, the upper permanent magnet 20 constitutes a magnetic closed loop shown by a white arrow in FIG. 2, and the magnetic force of the upper permanent magnet 20 causes the upper plunger 10 to move.
Are latched in the raised position. As a result, the electromagnetic coil 25
Even if the forward energization to is stopped, the valve body 5 remains in the intermediate flow rate position.

Next, when the electromagnetic coil 25 is momentarily energized in the forward direction and then instantaneously energized in the reverse direction while the valve body 5 is positioned at the intermediate flow rate position, the yoke 18 is moved to the position shown in FIG.
Is excited in the direction of the second magnetic pole indicated by the broken line arrow, and the magnetic circuit indicated by the broken line arrow is constructed. As a result, the upper plunger 10 is magnetically attracted to the attractor 11 by the magnetic holding action of the bear removing coil 26. While maintaining this state, the lower plunger 9 is magnetically attracted to the upper plunger 10, and the lower plunger 9 is also positioned in the raised position. Due to this movement, the valve body 5 is further lifted against the spring force of the return spring 12 and is positioned at the maximum flow rate position shown in FIG.

In this state, the lower permanent magnet 21 constitutes a magnetic closed loop shown by an outline arrow in FIG. 3, and the magnetic force of the lower permanent magnet 21 causes both the lower plunger 9 and the upper plunger 10 to be latched in the raised position. To be done. As a result, the valve body 5 maintains the state of being located at the maximum flow rate position even when the reverse energization to the electromagnetic coil 25 is stopped.

The relationship between energization and flow rate during this valve opening process is shown in FIG.
It is shown in (A). In FIG. 4, MIN indicates the minimum flow rate, MID indicates the intermediate flow rate, and MAX indicates the maximum flow rate. When the electromagnetic coil 25 is momentarily energized in the reverse direction after the valve body 5 is located at the maximum flow rate position and then instantaneously energized in the forward direction, the upper plunger 10 is magnetically retained by the bear removing coil 26. Due to the action, only the lower plunger 9 returns to the lowered position while being magnetically attracted to the suction element 11, and the valve body 5 returns to the intermediate flow rate position shown in FIG. 2 by the spring force of the return spring 12 accordingly.

Also in this case, the upper permanent magnet 20 constitutes a magnetic closed loop shown by an outline arrow in FIG. 2, and the magnetic force of the upper permanent magnet 20 causes the upper plunger 10 to be latched to the raised position, so that the electromagnetic coil 25 is moved. Even if the forward energization is stopped, the valve body 5 remains in the intermediate flow rate position.

Next, when the electromagnetic coil 25 is repeatedly energized in the reverse direction several times with a pulse having a width of several msec while the valve body 5 is located at the intermediate flow rate position, the upper permanent magnet 20 causes the upper permanent magnet 20 to move as shown in FIG. The magnetic closed loop indicated by the white arrow is canceled and the spring force of the return spring 12 causes the upper plunger 10 to descend together with the valve element 5 to return the valve element 5 to the minimum flow rate position shown in FIG.

The relationship between energization and flow rate during this valve closing process is shown in FIG.
It is shown in (B). In addition, when the valve body 5 is moved from the minimum flow rate position to the maximum flow rate position at a stretch,
As shown in FIG. 5, the electromagnetic coil 25 may be energized in the reverse direction while the valve body 5 is located at the minimum flow rate position.

5 to 7 show a second embodiment of the step flow rate 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 upper permanent magnet 20
The upper magnetic pole piece 23 is omitted, and the electromagnetic coil 25 is directly connected to the upper piece portion 18a and the lower piece portion 18b of the yoke 18. In the second embodiment, since the upper permanent magnet 20 is omitted, it is necessary to continuously energize the electromagnetic coil 25 in the forward direction in order to hold the valve body 5 at the intermediate flow rate position. When moving the valve body 5 from the maximum flow rate position to the minimum flow rate position at once, the electromagnetic coil 25
It is necessary to repeatedly perform forward energization several times with a pulse having a width of several msec, but when returning the valve body 5 from the intermediate flow position to the minimum flow position, reverse energization of the electromagnetic coil 25 with a width of several msec is performed. The valve body 5 returns from the intermediate flow rate position to the minimum flow rate position only by stopping the energization of the electromagnetic coil 25 without having to repeat the operation several times with a pulse. Except for these matters, the operation is substantially similar to that of the first embodiment.

5 shows the valve body 5 in the minimum flow rate position, FIG. 6 shows the valve body 5 in the intermediate flow rate position, and FIG. 7 shows the valve body 5 in the maximum flow rate position. Shows. Further, FIG. 8 (A) shows the relationship between the energization and the flow rate at the staged valve opening in the second embodiment, and FIG. 8 (B) shows the relationship between the energization and the flow rate at the staged valve closing, and FIG. Similarly, each shows the relationship between the energization and the flow rate at the time of the open / close valve.

9 to 11 show a third embodiment of the step flow rate control valve according to the present invention. In the third embodiment, the lower permanent magnet 21 and the lower magnetic pole piece 24 are omitted. In the third embodiment, since the lower permanent magnet 21 is omitted, it is necessary to continuously energize the electromagnetic coil 25 in the opposite direction in order to hold the valve body 5 at the maximum flow rate position. Other than that, the operation is substantially similar to that of the first embodiment.

FIG. 9 shows the valve body 5 in the minimum flow rate position, and FIG. 10 shows the valve body 5 in the intermediate flow rate position.
FIG. 11 shows the state where the valve body 5 is at the maximum flow rate position. Further, FIG. 12 (A) shows the relationship between the energization and the flow rate at the staged valve opening in the third embodiment, and FIG. 12 (B) shows the relationship between the energization and the flow rate at the staged valve closing, and FIG. Similarly, each shows the relationship between the energization and the flow rate when the valve is opened once.

13 to 15 show a fourth embodiment of the step flow rate control valve according to the present invention. In the fourth embodiment, an intermediate spring 27 is provided between the lower plunger 9 and the upper plunger 10 in the second embodiment, which is a compression coil spring that biases the lower plunger 9 and the upper plunger 10 in a direction in which they are separated from each other.

In the fourth embodiment, the intermediate spring 27
Lower plunger 9 and upper plunger 10 due to the spring force of
Since and are biased away from each other,
As shown in FIG. 3, the upper plunger 10 and the lower plunger 9 rattle under the condition where the valve body 5 is located at the minimum flow rate position, and as shown in FIG. The rattling of the lower plunger 9 is prevented under the condition that the valve is located at the intermediate flow rate position. Note that FIG. 15 shows the state where the valve body 5 is at the maximum flow rate position.

In the fourth embodiment, the energization of the electromagnetic coil 25 may be controlled in the same manner as in the second embodiment. The intermediate spring 27 is installed by the above-mentioned first embodiment,
The same may be done in the third embodiment, and similar effects can be obtained in these embodiments.

16 to 18 show a fifth embodiment of the step flow rate control valve according to the present invention. In the fifth embodiment, the needle-shaped inner valve body (first valve body) 5 driven by the upper plunger 10 and the outer valve body formed integrally with the lower plunger 9 and driven by the lower plunger 9 ( Second valve body) 28 is provided.

The lower plunger 9 has a hollow structure as a whole, including the outer valve body 28, and an inner valve seat portion (the first valve seat portion) on which the inner valve body 5 is selectively seated near the lower end of the hollow portion. A valve seat portion) 29 is formed. By seating the inner valve body 5 on the inner valve seat portion 29, the communication between the communication ports 30 and 31 formed in the outer valve body 28 is blocked.

The outer valve body 28 is selectively seated on the valve seat portion (second valve seat portion) 4 formed on the valve body 1 to connect to the connection port 2
The communication with 3 and 3 is cut off. In the illustrated example, the bypass passage 3 is provided near the valve seat portion of the valve body 1 in order to ensure the minimum flow rate even when the inner valve body 5 and the outer valve body 28 are located at the valve closing positions.
2 is formed.

In this embodiment, in the normal state (minimum flow rate state) shown in FIG. 16, the electromagnetic coil 25 is energized in the forward direction, and the upper plunger 1 as in the above-described embodiments.
When 0 is located at the rising position where it is magnetically attracted to the suction element 11, the inner valve body 5 is lifted and separated from the inner valve seat portion 29, as shown in FIG.
Communication between 0 and 31 is established, and an intermediate open state is obtained with an intermediate flow rate determined by the passage cross-sectional area of the bypass flow passage 32 and the effective diameter of the inner valve seat portion 29.

When the electromagnetic coil 25 is energized in the reverse direction in this middle open state, the upper plunger 10 is magnetically attracted to the attractor 11 by the magnetic holding action of the bear removing coil 26, as shown in FIG. The lower plunger 9 is magnetically attracted to the upper plunger 10 while being kept in the attracted state so as to be positioned at the raised position, and the outer valve body 28 is moved to the valve seat portion 4
Further separation is established, communication between the connection ports 2 and 3 is established, and a maximum flow rate state is obtained by the maximum flow rate determined by the passage cross-sectional area of the bypass flow passage 32 and the effective aperture of the valve seat portion 4.

Also in this embodiment, in this maximum flow rate state, the permanent magnet 21 constitutes a magnetic closed loop shown by an outline arrow in FIG. 18, and the magnetic force of the permanent magnet 21 raises both the lower plunger 9 and the upper plunger 10. Latched in position. As a result, the maximum flow rate state is maintained even when the reverse current supply to the electromagnetic coil 25 is stopped.

This double valve structure may be similarly applied to the above-mentioned first and third embodiments, and similar effects can be obtained in these embodiments. 19 to 21 show a sixth embodiment of the step flow rate control valve according to the present invention.

The sixth embodiment is a modification of the first embodiment, in which the upper magnetic pole piece 23 is omitted, the electromagnetic coil 25 is connected to the lower piece portion 18b of the yoke 18, the upper magnet 20 and the attractor 11 are connected. The yoke 33 is arranged between the two. In this embodiment, as shown in FIG. 20, the upper permanent magnet 20 includes the upper plunger 10, the suction element 11, and the yoke, as in the first embodiment, because the upper plunger 10 is located at the raised position. 18 and a magnetic closed loop (indicated by an outlined arrow in the figure) is formed to latch the upper plunger 10 in the raised position.

As shown in FIG. 21, the lower permanent magnet 21 has the upper plunger 10 and the lower plunger 9 both located at the raised position, so that the lower plunger 9, the upper plunger 10, the attractor 11 and the bolts. Magnetic closed loop consisting of 17 and yoke 18 (indicated by white arrow in the figure)
To latch the lower plunger 9 in the raised position.

In the electromagnetic coil 25, when the yoke 18 is forwardly energized, the yoke 18 is in the same direction as the magnetic pole direction of the upper permanent magnet 20 and in the direction opposite to the magnetic pole direction of the lower permanent magnet 21. Is excited in the magnetic pole direction of the upper plunger 10
Is driven to a raised position, and the yoke 18 is reversely energized to move the yoke 18 in a direction opposite to the magnetic pole direction of the upper permanent magnet 20.
19, the lower plunger 9 is driven to the raised position by exciting in the second magnetic pole direction indicated by the broken line arrow in FIG.

Therefore, in this embodiment, the same operation and effect as in the first embodiment can be obtained by controlling the energization of the electromagnetic coil 25 similar to that in the first embodiment. Next, an example of use of the step flow rate control valve according to the present invention in a refrigeration cycle will be described with reference to FIGS.

FIG. 22 (A) is a system circuit diagram of a heat pump type cooling / heating air conditioner, in which 50 is a compressor, 51 is an outdoor heat exchanger, 52 is a capillary,
53 is an indoor heat exchanger, 54 is an accumulator, 55 is a four-way valve, and the step flow rate control valve 56 is arranged between the capillary 52 and the indoor heat exchanger 53.

In this cooling / heating air conditioner, the step flow control valve 56 can change the refrigerant flow rate in the refrigeration cycle into three stages of small, medium, and large, and the refrigerant flow rate can be set in three stages in accordance with the rotation speed of the compressor 50. By changing to, the air conditioning operation with the optimum energy efficiency can be performed under some compressor rotation speeds.

Depending on whether the throttle element by the capillary 52 is arranged upstream or downstream of the step flow rate control valve 56, the same opening degree of the step flow rate control valve 56 can cope with the difference in the required flow rate during cooling and heating. Is possible. Since the refrigerant flow rate during heating may be smaller than that during cooling, FIG.
As shown in (B), a check valve 57 that allows only the refrigerant flow during cooling may be connected in parallel to the capillary 52.

Further, as shown in FIG. 22 (C),
A difference in the refrigerant flow rate between heating and cooling can be provided only by setting the passage length L of the valve seat portion 4 of the step flow rate control valve 56 to an appropriate value. Further, as shown in FIG. 23, a capillary 52 for distributing and supplying the refrigerant to a plurality of paths of the outdoor heat exchanger 51 and the indoor heat exchanger 53 provides a difference in the refrigerant flow rate during heating and during cooling. In this case, it is not necessary to provide special equipment around the step flow control valve 56.

FIG. 24 shows a system circuit of a cooling / heating air conditioner having a dehumidifying function. In this cooling / heating air conditioner, between the two indoor heat exchangers 53a and 53b, the outdoor heat exchanger 51 and the indoor heat exchanger. A step flow control valve 56 is connected to each of the devices 53a.

When the step flow rate control valve 56 is not used, it is necessary to connect a parallel circuit of the capital and the solenoid valve or a parallel circuit of the capital, the solenoid valve and the check valve between them in order to control the refrigerant flow rate. However, the use of the step flow control valve 56 eliminates the need to provide a parallel circuit that requires many of these components, and simplifies the system circuit configuration.

FIG. 25 shows a system circuit of a distribution type heating / cooling air conditioning system. In this cooling / heating air conditioning system, a step flow control valve 56 is connected to each of a plurality of indoor heat exchangers 53 connected in parallel with each other. The flow rate of the refrigerant flowing through each indoor heat exchanger 53 can be variably set individually by each step flow rate control valve 56.

FIG. 26 shows a system circuit of a vehicle-mounted dual air conditioner. In this dual air conditioner, a step flow control valve 56 is used in place of the mechanical expansion valve. FIG. 27 shows a system circuit of an on-vehicle dual air conditioner. In this dual air conditioner, a step flow rate control valve 56 is connected in series with each expansion valve 58 instead of the solenoid valve for switching the indoor heat exchanger 53. There is. When using the solenoid valve, the liquid hammer phenomenon may occur due to the opening / closing operation of the solenoid valve.
In the case of 6, the occurrence of the liquid hammer phenomenon can be avoided by the slow valve function.

FIG. 28 shows an example in which a step flow control valve 56 is used in the vehicle air conditioner instead of the solenoid valve in the refrigerant passage for cooling the compressor. Further, FIG. 29 shows an example in which a step flow rate control valve 56 is used in place of the evaporation pressure adjusting valve in an on-vehicle air conditioner, and FIG. 30 shows an example in which a step flow rate control valve 56 is used in place of the hot gas bypass valve. ing.

[0062]

As can be understood from the above description, according to the step flow rate control valve of the present invention, the valve opening position can be switched in three steps only by controlling the energization direction of the electromagnetic coil and energization on / off. Then, the valve body is self-held at each valve opening position by the magnetic force of the permanent magnet, and it is not necessary to continuously energize the electromagnetic coil to maintain the valve opening state, and the power consumption for driving the valve is small. . This is particularly preferable when the power source is a battery power source in an automobile or the like.

When the intermediate spring is provided between the first plunger and the second plunger, rattling of the first plunger and the second plunger is avoided, durability is improved, and The generation of noise due to the rattling is also avoided. Further, when the valve element has a double structure, the flow rate at the second opening position and the flow rate at the third opening position can be set reliably and accurately by opening and closing each valve element.

Further, when the suction element is provided with the bear removing coil, the first plunger is temporarily moved to the second position when the valve body is moved from the second opening position to the third opening position. Further separation is avoided, and noise generation at the time of attracting the plunger is prevented.

[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 in a minimum flow rate state.

FIG. 2 is a sectional view showing a first embodiment of a step flow rate control valve according to the present invention for an intermediate flow rate state.

FIG. 3 is a cross-sectional view showing a first embodiment of a step flow rate control valve according to the present invention in a maximum flow rate state.

4A, 4B, and 4C are time charts showing the relationship between energization and flow rate in the step flow rate control valve of the first embodiment.

FIG. 5 is a sectional view showing a second embodiment of the step flow rate control valve according to the present invention in a minimum flow rate state.

FIG. 6 is a sectional view showing a second embodiment of the step flow rate control valve according to the present invention in an intermediate flow rate state.

FIG. 7 is a sectional view showing a second embodiment of the step flow rate control valve according to the present invention in a maximum flow rate state.

8A, 8B, and 8C are time charts showing the relationship between energization and flow rate in the step flow rate control valve of the second embodiment.

FIG. 9 is a sectional view showing a third embodiment of the step flow rate control valve according to the present invention in a minimum flow rate state.

FIG. 10 is a sectional view showing a third embodiment of the step flow rate control valve according to the present invention in an intermediate flow rate state.

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

12 (A), (B) and (C) are time charts showing the relationship between energization and flow rate in the step flow rate control valve of the third embodiment.

FIG. 13 is a sectional view showing a fourth embodiment of a step flow rate control valve according to the present invention in a minimum flow rate state.

FIG. 14 is a sectional view showing a fourth embodiment of the step flow rate control valve according to the present invention in an intermediate flow rate state.

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

FIG. 16 is a sectional view showing a fifth embodiment of a step flow rate control valve according to the present invention in a minimum flow rate state.

FIG. 17 is a sectional view showing a fifth embodiment of the step flow control valve according to the present invention in an intermediate flow rate state.

FIG. 18 is a sectional view showing a fifth embodiment of the step flow rate control valve according to the present invention in a maximum flow rate state.

FIG. 19 is a sectional view showing a sixth embodiment of the step flow rate control valve according to the present invention in a minimum flow rate state.

FIG. 20 is a sectional view showing a sixth embodiment of the step flow rate control valve according to the present invention in an intermediate flow rate state.

FIG. 21 is a sectional view showing a sixth embodiment of a step flow rate control valve according to the present invention in a maximum flow rate state.

22 (A) is a system circuit diagram showing an example in which the step flow rate control valve according to the present invention is used in a heat pump type cooling / heating air conditioner, and FIG. 22 (B) is a circuit diagram showing a main part of a modified example thereof.
(C) is a partial sectional view showing a modified example of the valve seat portion of the step flow control valve.

FIG. 23 is a system circuit diagram showing another example in which the step flow rate control valve according to the present invention is used in a heat pump type cooling / heating air conditioner.

FIG. 24 is a system circuit diagram showing an example in which the step flow rate control valve according to the present invention is used in a cooling / heating air conditioner having a dehumidifying function.

FIG. 25 is a system circuit diagram showing an example in which the step flow rate control valve according to the present invention is used in a distribution type cooling / heating air conditioner.

FIG. 26 is a system circuit diagram showing an example in which the step flow rate control valve according to the present invention is used in a vehicle-mounted dual air conditioner.

FIG. 27 is a system circuit diagram showing another example in which the step flow rate control valve according to the present invention is used in a vehicle-mounted dual air conditioner.

FIG. 28 is a system circuit diagram showing another example in which the step flow rate control valve according to the present invention is used in a vehicle-mounted dual air conditioner.

FIG. 29 is a system circuit diagram showing an example in which the step flow rate control valve according to the present invention is used instead of the evaporation pressure adjusting valve.

FIG. 30 is a system circuit diagram showing an example in which the step flow rate control valve according to the present invention is used in place of a hot gas bypass valve.

FIG. 31 is a cross-sectional view showing a conventional step flow rate control valve.

[Explanation of symbols]

 1 valve body 4 valve seat 5 valve body 9 lower plunger 10 upper plunger 11 suction element 12 return spring 18 yoke 20 upper permanent magnet 21 lower permanent magnet 25 electromagnetic coil 26 bear coil 27 middle spring 28 outer valve body 29 inner valve Seat 56 step flow control valve

Claims (6)

[Claims] 1. A valve body, a valve body for axially moving relative to the valve body to control a flow rate in cooperation with a valve seat portion, and urging the valve body in a valve closing direction, A return spring that positions the valve body at a first opening position, and a return spring that is movably disposed between a first position and a second position in the moving direction of the valve body, and a second position from the first position. A first plunger that engages with the valve body by moving to a position of 2 to position the valve body at a second opening position on the valve opening side from the first opening position; In series with the moving direction of the plunger and the valve body,
It is movably arranged between a third position and a fourth position in the moving direction of the valve body, and is engaged with the valve body by moving from the third position to the fourth position. A second plunger that positions the valve element at a third opening position that is closer to the valve opening side than the second opening position, and is fixed so as to face the end surface of the first plunger on the second position side. A magnet disposed by the first plunger, the suction element, and the yoke, the first plunger being located at the second position, and the yoke having one end connected to the suction element. A first permanent magnet forming a closed loop to latch the first plunger in the second position, the first plunger in the second position and the second plunger in the fourth position To position the second plunger and the A second permanent magnet that forms a magnetic closed loop with the first plunger, the attractor, and the yoke to latch the second plunger in the fourth position, and the yoke by energizing in the first direction. The first plunger is driven to the second position by exciting in a first magnetic pole direction that is the same as the magnetic pole direction of the first permanent magnet and opposite to the magnetic pole direction of the second permanent magnet. , A second direction that is opposite to the magnetic pole direction of the first permanent magnet and is in the same direction as the magnetic pole direction of the second permanent magnet by energizing in a second direction opposite to the first direction. An electromagnetic coil that is excited in a magnetic pole direction to drive the second plunger to the fourth position, and a step flow control valve. 2. A valve body, a valve body for axially moving relative to the valve body to control a flow rate in cooperation with a valve seat portion, and urging the valve body in a valve closing direction, A return spring that positions the valve body at a first opening position, and a return spring that is movably disposed between a first position and a second position in the moving direction of the valve body, and a second position from the first position. A first plunger that engages with the valve body by moving to a position of 2 to position the valve body at a second opening position on the valve opening side from the first opening position; In series with the moving direction of the plunger and the valve body,
It is movably arranged between a third position and a fourth position in the moving direction of the valve body, and is engaged with the valve body by moving from the third position to the fourth position. A second plunger that positions the valve element at a third opening position that is closer to the valve opening side than the second opening position, and is fixed so as to face the end surface of the first plunger on the second position side. A suction element disposed, a yoke having one end connected to the suction element, the first plunger located at the second position, and the second plunger located at the fourth position A permanent magnet for forming a magnetic closed loop by the second plunger, the first plunger, the attractor, and the yoke to latch the second plunger at the fourth position; Set the yoke in the direction opposite to the magnetic pole direction of the permanent magnet. Of the permanent magnet to drive the first plunger to the second position by energizing in a second direction opposite to the first direction. An electromagnetic coil for exciting the second plunger to the fourth position by exciting in a second magnetic pole direction in the same direction as the step flow control valve. 3. A valve body, a valve body that moves in an axial direction with respect to the valve body to control a flow rate in cooperation with a valve seat portion, and urges the valve body in a valve closing direction. A return spring that positions the valve body at a first opening position, and a return spring that is movably disposed between a first position and a second position in the moving direction of the valve body, and a second position from the first position. A first plunger that engages with the valve body by moving to a position of 2 to position the valve body at a second opening position on the valve opening side from the first opening position; In series with the moving direction of the plunger and the valve body,
It is movably arranged between a third position and a fourth position in the moving direction of the valve body, and is engaged with the valve body by moving from the third position to the fourth position. A second plunger that positions the valve element at a third opening position that is closer to the valve opening side than the second opening position, and is fixed so as to face the end surface of the first plunger on the second position side. A magnet disposed by the first plunger, the suction element, and the yoke, the first plunger being located at the second position, and the yoke having one end connected to the suction element. A permanent magnet forming a closed loop to latch the first plunger in the second position; and exciting the yoke in a first magnetic pole direction that is the same as the magnetic pole direction of the permanent magnet by energizing in the first direction. To drive the first plunger to the second position Then, the yoke is excited in a second magnetic pole direction opposite to the magnetic pole direction of the first permanent magnet by energization in a second direction opposite to the first direction, thereby causing the second plunger to move. A step flow rate control valve comprising: an electromagnetic coil that is driven to a fourth position. 4. An intermediate spring is provided between the first plunger and the second plunger to bias the two plungers in a direction in which they are separated from each other with a spring force weaker than a spring force of the return spring. Claims 1-3 characterized by the above.
The step flow rate control valve according to any one of 1. 5. The valve body has a double structure including a first valve body driven by the first plunger and a hollow second valve body driven by the second plunger, The one valve body cooperates with the first valve seat portion formed on the second valve body to control the flow rate, and the second valve body forms the second valve seat portion formed on the valve body. The step flow rate control valve according to claim 1, wherein the flow rate control is performed in cooperation with each other. 6. The step flow control valve according to claim 1, wherein the suction element is provided with a bear removing coil.