KR100546654B1 - Fluidic mass flow control valve actuated by electromagnetic force - Google Patents

Abstract

The present invention discloses a fluid flow control valve actuated by electromagnetic force. The valve according to the present invention is provided with a cylindrical valve body, the permanent magnet and the needle is installed inside the valve body, the coil and the first and second yoke is provided on the outer peripheral surface of the valve body. The needle is connected to a rod installed to penetrate the permanent magnet. The valve body is provided with first and second ports to communicate the external space with the internal space of the valve body. Here, the first and second ports are formed in a straight line. A thin orifice is formed inside the valve body to communicate the first and second ports. The needle is disposed to correspond to one side of the orifice, and moves with the permanent magnet in the up and down direction together with the permanent magnet when a current is applied to the coil. The direction and amount of movement of the needle are determined by the direction and intensity of the current applied to the coil. As the needle moves, the tip portion of the needle linearly changes the open area of the orifice. Therefore, the amount of fluid introduced through either one of the first and second ports through the orifice and then outward through the other is controlled by the position of the needle.

Valve body, needle, permanent magnet, coil, yoke, orifice

Description

Fluidic mass flow control valve actuated by electromagnetic force

1 is a perspective view of an embodiment of an electromagnetic fluid flow control valve according to the present invention;

2 is a perspective view showing a cross section of FIG. 1;

3A-3C are partial exploded perspective views of FIG. 2;

3A is an exploded perspective view showing the structure of components installed on the upper side of the inside of the valve body;

3B is an exploded perspective view showing the structure of the valve body and the components installed on the lower side of the inside thereof;

3C is an exploded perspective view showing the structure of a valve body in which parts are mounted therein and parts mounted outside thereof;

4A and 4B are views showing the vertical length of the first yoke and the position of the needle when the valves are manufactured as normally open type and normally closed type valves, respectively.

4A shows an open valve in which the needle always opens the orifice when no current is applied;

4b shows a normally closed valve in which the needle always closes the orifice when no current is applied;

FIG. 5 is a schematic view showing a principle in which permanent magnets are injured by magnetic force, in which parts made of a nonmagnetic substance are removed; FIG.

6 is a graph showing the relationship between the magnetic force (Fm) applied to the permanent magnet and the vertical axis displacement (Z) of the permanent magnet;

7A and 7B illustrate a relationship between an induction field B _u and B _d formed according to a direction in which a current is applied to a coil and an induction electromotive force F _u and F _d applied to a permanent magnet. ,

Figure 7a is a view showing when the current is applied to the coil in the counterclockwise direction when viewed from above; And

FIG. 7B is a view illustrating a state in which a current is applied to the coil in a clockwise direction when viewed from above. FIG.

Explanation of symbols on the main parts of the drawings

100: valve body 131: orifice

140: limiter 150: cap

160, 170: spring 200: permanent magnet

230: Load 240: Needle

300: first yoke 350: coil

400: second yoke

The present invention relates to a valve for controlling the flow of the fluid flowing in the pipe, and more particularly, a fluid flow to regulate the flow or regulate the flow of the fluid using a needle (needle) operated by an electromagnetic force (electromagnetic force) It relates to a control valve.

In general, the fluid flow control valve is configured to control the amount of fluid passing through the orifice by linearly adjusting the open area of the orifice through which the fluid passes. In order to linearly adjust the open area of the orifice in the fluid flow control valve, a needle tapered with a tip is generally used. Within the valve, the needle is installed to reciprocate linearly in a state where the tapered tip is arranged to correspond to one side of the orifice. When the needles installed in this manner move linearly, the open area of the orifice occupied by the tapered tip of the needle increases or decreases, thereby decreasing or increasing the amount of fluid that can pass through the orifice.

In the same principle as described above, the valves for controlling the flow of fluid may be implemented in very different structures for linearly moving the needles. The following describes some conventional structures used to date.

An example of a conventional structure used up to now is a method using a step motor as an actuator for moving the needle. In this case, gears for converting rotational motions into linear motions are provided on the rotating shaft of the stepper motor, and needles are provided to engage the gears. In this manner, the needle moves in proportion to the number of pulses of the driving power applied to the step motor.

However, the step motor system having such a structure has a disadvantage in that the unit price of the valve device is inevitably increased because the step motor is expensive. In addition, since the sealing shaft of the step motor and the valve body on which the needle is disposed must be hermetically sealed, the assembly process is very difficult in manufacturing the valve device, and thus the manufacturing cost increases.

Another example of a conventional structure used to date is the use of a thin plate diaphragm (membrane) or membrane (membrane). In this case, a needle is connected to the diaphragm or the membrane, and a separate pressurized space is provided on the back side of the diaphragm or the membrane to which the needle is connected to adjust the pressure. The pressurized space is filled with a predetermined fluid. Such a structure makes it possible to deform the diaphragm or the membrane by using the expansion pressure generated when the fluid is heated, thereby moving the needle.

However, such a structure also has a disadvantage in that it is difficult to miniaturize the valve device because of the need to provide a separate pressurized space, and the power consumption by heat generation is very large. In addition, since the valve is indirectly moved by using the expansion pressure due to the heating of the pressurized space, the response speed of the valve is slow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a fluid flow control valve capable of arbitrarily adjusting the flow rate of the fluid.

Another object of the present invention is to provide a fluid flow control valve having a high response speed and excellent performance by using electromagnetic force.

It is still another object of the present invention to provide a fluid flow control valve having a simple structure and good assemblability and thus having high productivity.

Another object of the present invention is to provide a miniaturized fluid flow control valve.

The present invention for achieving the above object, the first port formed on the lower end, the second port formed on the upper end, orifice (orifice) formed therein to communicate the first and second ports, A valve body having a space inside the upper side; A permanent magnet installed in the space to be movable in the vertical direction and having at least one fluid passage hole formed in the vertical direction; A coil connected to an electric circuit and wound around an outer circumferential surface of the valve body; A first yoke installed to surround an outer circumferential surface of the valve body at a position corresponding to an upper portion of the permanent magnet to maintain the permanent magnet in a floating state in the space by a magnetic force; A tapered tip is disposed to correspond to one side of the orifice, and moves together when the permanent magnet moves upward or downward by an electromagnetic force generated when an electric current is applied to the coil. An electromagnetic fluid flow control valve is provided that includes a needle that changes the open area linearly.

Here, the valve body, for example, is made of a long cylindrical in the vertical direction. In addition, the valve body may include three pieces that are detachable to improve manufacturability and assembly. In this case, the valve body, the first piece is coupled to the coil and the first yoke on the outer circumferential surface, the permanent magnet is received therein and the second port is formed on the upper end, and the upper and lower ends are opened on a portion of the outer circumferential surface A second piece coupled to a lower end of the first piece such that the coil is wound and the needle is positioned in an inner cavity, an orifice is formed therein, and a first port is formed at a lower end of the needle; And a third piece coupled to the bottom of the second piece so as to be disposed at a position corresponding to the orifice. Here, the first piece and the second piece are preferably made of a nonmagnetic substance. In the valve body, the first port and the second port are preferably formed on the same imaginary line. And it is preferable that the plurality of passage holes are radially disposed in the permanent magnet.

The needle may be coupled to a lower end of a rod installed to penetrate the permanent magnet or directly connected to the permanent magnet to move together with the permanent magnet. This rod is preferably made of a nonmagnetic material.

The upper end of the valve body is also made of nonmagnetic material and closed by a detachable cap. The electromagnetic fluid flow control valve according to the present invention may further include a limiter installed on the upper side of the space to reduce the horizontal cross-sectional area of the space to limit the rising height of the permanent magnet. When the cap is installed, the limiter is installed to reduce the horizontal cross-sectional area of the space between the cap and the permanent magnet. Here, the limiter is made of a nonmagnetic material, it is preferable that the limiter is made of a ring shape having an inner circumference smaller than the outer circumference of the permanent magnet.

On the other hand, the first yoke is preferably made of a material having a high permeability to focus the magnetic field on the upper end of the permanent magnet. The electromagnetic fluid flow control valve according to the present invention may further include a second yoke coupled to an outer circumferential surface of the valve body and installed to surround the coil. The second yoke is made of a material having a high permeability, such as iron, to increase the magnetic flux density in the valve body, which is provided at an upper piece installed to enclose an upper portion of the coil, and a lower portion of the upper piece. And a lower piece surrounding the lower portion of the coil.

An electromagnetic fluid flow control valve is installed such that a portion thereof is fixed to the valve body and the rod, respectively, to prevent the permanent magnet, the rod or the needle from contacting the inner wall of the valve body when the permanent magnet moves. It may further comprise at least one or more springs to impart a restoring force so that the permanent magnet is in place. Here, the spring comprises a first spring for supporting the upper end of the rod through the permanent magnet, and a second spring for supporting the lower end of the rod connected to the needle.

The springs may include a first ring fixed to the valve body, a second ring disposed inside the first ring and fitted with an inner circumferential surface of the rod, and connecting the first ring and the second ring. The first ring may include suspenders that have elasticity in the radial direction of the first ring and have elastic stiffness in the vertical direction of the first ring. Each of these springs is made of a nonmagnetic material.

Meanwhile, the needle may be arranged to close the orifice in a state where no current is applied to the coil, or may be arranged to completely open the orifice, or the tip may be disposed to occupy a part of the open area of the orifice. have.

The electrical circuit may include a circuit capable of arbitrarily adjusting the strength and direction of the current supplied to the coil so that the needle linearly increases or decreases the open area of the orifice, in which case the electrical circuit is digitized. It may also be configured by applying a pulse width modulation circuit (PWM circuit) that can arbitrarily adjust the period and pulse width of the applied current.

In addition, the electrical circuit may be made of a circuit capable of applying a current having a predetermined force to the coil so that the needle can operate as a bistable on / off valve to open or close the orifice. .

An inlet tube through which a high pressure fluid flows may be connected to the first port, and an outlet tube through which the fluid passing through the orifice is discharged may be connected to the second port. In this case, the diameter of the orifice is preferably smaller than the diameter of the first port so that the pressure and temperature of the fluid is lowered after passing through the orifice.

Contrary to the above, an inlet tube through which the high pressure fluid flows is connected to the second port, and an outlet tube through which the fluid passing through the orifice is discharged may be connected to the first port. have. Meanwhile, the fluid introduced into the valve body and discharged to the outside after passing through the orifice may be in a gaseous state, in a liquid state, or in a state in which gas and liquid are mixed, or a super critical fluid. It can be made of).

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention in which the above object can be specifically realized are described with reference to the accompanying drawings. In describing the embodiments, the same names and symbols are used for the same components, and additional description thereof will be omitted below.

1 is a perspective view of an embodiment of an electromagnetic fluid flow control valve according to the present invention, Figure 2 is a perspective view showing a cross-sectional view of FIG. 3A to 3C are partially disassembled perspective views of FIG. 2, and FIG. 3A is an exploded perspective view illustrating a structure of components installed on the upper side of the inside of the valve body, and FIG. 3B is a lower side of the valve body and the inside thereof. FIG. 3C is an exploded perspective view illustrating a structure of a valve body in which parts are installed and parts mounted on the outside thereof. Hereinafter, the specific structure of an embodiment of an electromagnetic fluid flow control valve according to the present invention will be described in detail with reference to these drawings. For reference, for convenience of description, the longitudinal direction of the valve illustrated in the drawings is referred to as a vertical direction or a vertical direction, and the diameter or width direction of the valve is referred to as a horizontal direction. In addition, the threads for screwing the respective parts are not shown in order to simplify the drawings.

1 and 2, the electromagnetic fluid flow control valve is provided with a cylindrical valve body 100, the permanent magnet 200 and the needle 240 is installed inside the valve body 100 On the outer circumferential surface of the valve body 100, a coil 350, a first yoke 300, and a second yoke 400 are installed. The needle 240 is connected to a rod 230 installed to penetrate the permanent magnet 200. In addition, two ports, that is, the first port 135 and the second port 155, are provided in the valve body 100 so as to communicate the external space with the internal space of the valve body 100. Here, the first port 135 and the second port 155 are disposed to be located in a virtual straight line.

A thin orifice 131 is formed inside the valve body 100 to communicate the first port 135 and the second port 155. The needle 240 is disposed to correspond to one side of the orifice 131, and moves upward and downward from the inside of the valve body 100 together with the permanent magnet 200 when a current is applied to the coil 350. do. The moving direction and the moving amount of the needle 240 are determined by the direction and intensity of the current applied to the coil 350.

Meanwhile, at least one or more springs 160 and 170 supporting the rod 230 are provided to the valve body 100 to smoothly guide the vertical movement when the needle 240 moves. When the needle 240 moves, the tip portion 243 of the needle 240 linearly changes the open area of the orifice 131. Therefore, the amount of fluid introduced through one of the first port 135 and the second port 155 after passing through the orifice 131 is discharged to the outside through the other is located at the position of the needle 240. Controlled by

Here, the valve body 100 of the cylindrical shape is formed long in the vertical direction as shown in Figs. However, the valve body 100 is not limited to a cylinder shape, and the coil 350 may be easily wound on the outside and a space in which various components such as the permanent magnet 200 may be installed therein. It is enough to produce a shape with an excitation.

A plurality of parts are installed in the valve body 100. Therefore, it is preferable that the valve body 100 has a structure that can be easily manufactured and assembled after mounting the respective components inside the valve body 100. To this end, the valve body 100 is preferably composed of a plurality of pieces (for example, three pieces) as shown in Figures 3a to 3c. The three pieces are each manufactured separately and then screwed together or joined by welding, brazing, pressing, or the like to form a valve body 100. Hereinafter, the first piece 110, the middle piece, and the lower piece are referred to as a third piece 130.

The first piece 110 is formed in a cylindrical shape with the top and bottom open as shown in FIG. 3A. The lower portion of the first piece 110 is formed with a thread (not shown) for coupling with the second piece 120. A detachable cap 150 is coupled to the open upper portion of the first piece 110. The second port 155 is formed in the center of the cap 150 in the vertical direction as shown in Figure 3a. The cap 150 may be press-fitted into the first piece 110 or may be screwed. As shown in FIG. 3A, a space 111 is formed in the first piece 110 to accommodate the permanent magnet 200. Therefore, the second port 155 communicates the upper outer space of the first piece 110 with the space 111.

The lower side of the space 111 of the inside of the first piece 110 so that the lower end of the permanent magnet 200 is supported by the step (step) (step) from the inner wall of the first piece (110) It protrudes in the radial direction of the first piece 110. Here, the lower side of the first piece 110 is preferably fully opened. This is to ensure a sufficient flow path of the fluid flowing inside the valve body 100 through the second port 155 and the first port 135. Therefore, the jaw 112 is preferably protruded only enough to support the lower circumferential portion of the permanent magnet 200. The coil 350 and the first yoke 300 are coupled to an outer circumferential surface of the first piece 110 having the above structure, which will be described later.

The second piece 120 is welded or brazed or press-fitted to the bottom of the first piece 110, as shown in FIGS. 2 and 3B, or is screwed. To this end, other threads corresponding to the threads of the first piece 110 are formed on the upper end of the second piece 120, or a fastening portion required in the welding and indentation process is formed. The present invention proposes a structure in which the first piece 110 and the second piece 120 can be coupled in a state of higher airtightness, which will be briefly described below.

As shown in FIGS. 3A and 3B, an annular protrusion 114 is formed at the lower end of the first piece 110. The screw thread may be further formed on at least one of an inner circumferential surface and an outer circumferential surface of the protrusion 114. In addition, an upper end of the second piece 120 is formed with an annular groove 123 (groove) that can accommodate the protrusion 114, as shown in Figure 3b. The groove 123 may further include another thread corresponding to the thread of the protrusion 114. With the above structure, the first piece 110 and the second piece 120 can be combined while maintaining a high airtightness. If necessary, a sealant or an O-ring may be inserted into the annular groove 123 to further increase airtightness.

The second piece 120 also has a cylindrical shape with the top and bottom open. The needle 240 is installed inside the second piece 120 and a cavity 125 is formed to move upward and downward. At the lower end of the second piece 120, for example, a screw thread for screwing the third piece 130 is formed at the lower outer circumferential surface, or a fastening part required for welding or pressing is formed. As shown in FIG. 2, the coil 350 is wound around a part of the upper circumferential surface of the second piece 120. And when the second yoke 400 is provided to the fluid flow control valve according to the present invention, the second yoke 400 is also provided above the outer circumferential surface. Therefore, in the fluid flow control valve according to the present invention, the coil 350 and the second yoke 400 are mounted on the outer peripheral surfaces of the first piece 110 and the second piece 120 as shown in FIG. 2. .

The third piece 130 is screwed or coupled to the lower end of the second piece 120 by welding or pressing. To this end, other threads corresponding to the threads of the second piece 120 are formed on the upper end of the third piece 130 or fastening portions corresponding to the welding or indentation methods are formed. A first port 135 is formed at a lower end of the third piece 130 to communicate an internal space and an external space of the third piece 130. As shown in FIG. 3B, the first port 135 is formed in a shape in which the lower end of the third piece 130 is completely opened. However, the first port 135 is not limited thereto, and when the lower end of the third piece 130 is formed to be closed, the first port 135 may be formed to have a predetermined size at the closed lower end.

An orifice 131 is formed in the third piece 130. The orifice 131 is formed along the vertical direction. The orifice 131 is preferably formed to have a smaller cross-sectional area than the first port 135. In order to form an orifice 131 having a very small cross-sectional area, a divider 133 is formed inside the third piece 130 to separate the upper and lower parts. Therefore, the orifice 131 is formed in the vertical direction at the center of the divider 133.

In the valve body 100 configured as described above, the first piece 110 and the second piece 120 are made of a nonmagnetic substance so as not to affect the magnetic field formed by the permanent magnet 200. . Of course, the third piece 130 is also preferably made of a nonmagnetic material. The first port 135 and the second port 155 are preferably arranged in a straight line as described above. When formed in this way, a tube (not shown) connected to the first port 135 and a tube (not shown) connected to the second port 155 are disposed in a straight line, so that fluid flows. It is possible to install the fluid flow control valve according to the present invention without changing the flow path.

The permanent magnet 200 is accommodated in the space 111 inside the valve body 100 as shown in FIG. 2. The permanent magnet 200 is polarized and magnetized in the vertical direction, and is accommodated in the space 111 so as to be movable in the vertical direction in a levitated state by a magnetic force. . Here, the principle that the permanent magnet 200 is floated will be described later. As shown in FIG. 3A, at least one passage hole 220 penetrates the permanent magnet 200 in the vertical direction. As shown in FIG. 3A, a plurality of flow path holes 220 are formed in the flow path 220, but are disposed radially. This is to minimize the flow resistance by ensuring a wide flow path of the fluid flowing in the valve body 100.

As described above, the horizontal cross-sectional area of the permanent magnet 200 is smaller than the horizontal cross-sectional area of the space 111 so that the permanent magnet 200 moves up and down within the space 111. ) Is formed shorter than the vertical length of the space (111). On the other hand, the through-hole 210 is formed in the vertical direction so that the rod 230 is coupled to the permanent magnet 200 through. When the valve body 100 is formed in a cylindrical shape, the permanent magnet 200 is formed in a circumferential shape, and the through hole 210 is formed along a central axis of the permanent magnet 200 as shown in FIG. 3A. Is formed.

The needle 240 has a tapered tip 243 tip as shown in FIGS. 2 and 3B. The tip portion 243 is disposed to correspond to one side of the orifice 131 as shown in FIG. 2. The needle 240 linearly changes the open area of the orifice 131 while moving together when the permanent magnet 200 moves vertically by the electromagnetic force. In order for the tip portion 243 of the needle 240 to linearly change the size of the open area of the orifice 131, the orifice 131 and the tip portion 243 may each have a circular horizontal cross section. Do. With such a structure, the size of the open area of the orifice 131 is linearly changed since the cross-sectional size of the circular tip portion 243 is changed within the open area of the circular orifice 131.

When the tip portion 243 of the needle 240 having the structure as described above is inserted into the orifice 131 to a certain degree, the tip portion 243 occupies the open area of the orifice 131 to a certain degree. In this initial state, when the needle 240 is lowered and the tip portion 243 is further inserted into the orifice 131, the open area of the orifice 131 is reduced than before. In addition, when the needle 240 rises in the initial state, the open area of the orifice 131 is increased than the initial state.

Referring to FIG. 3B, the needle 240 is coupled to the lower end of the rod 230. To this end, an insertion hole 241 is formed in the needle 240 from an upper end portion thereof to an inside thereof, and a pin 233 inserted into and fixed to an insertion hole 241 of the needle 240 in the lower end portion of the rod 230. Is formed. The pin 233 may be press-fitted into the insertion hole 241 or may be screwed together.

As shown in FIG. 2, the rod 230 has an upper end portion penetrated through the permanent magnet 200, and a lower end portion thereof is fixed to the needle 240. In addition, an extension 231 (extension) may extend outwardly along the radial direction on the outer surface of the rod 230 to support the lower end of the permanent magnet 200.

The extension 231 formed in the rod 230 not only supports the lower end of the permanent magnet 200, but also determines the exact position at which the permanent magnet 200 should be coupled to the rod 230. It also plays an important role. Therefore, when the expansion portion 231 is formed, the assemblability is further improved.

On the other hand, in the electromagnetic fluid flow control valve according to the present invention, although not shown, the needle 240 is not connected to the permanent magnet 200 by the rod 230, but directly to the permanent magnet 200 It may be connected. In this case, the upper portion of the needle 240 is formed long to replace the role of the rod 230. Such a simple structural change is not shown in the drawings because it can be easily understood by the above simple description.

When the needle 240 is connected to the permanent magnet 200 by the rod 230, or directly connected to the permanent magnet 200, when the permanent magnet 200 moves in the vertical direction by the electromagnetic force the permanent It is possible to move in the vertical direction by the same displacement as the displacement of the magnet 200. On the other hand, it is preferable that the rod 230 and the needle 240 having the structure as described above are each made of a nonmagnetic material in order to prevent affecting the magnetic field formed by the permanent magnet 200.

As shown in FIG. 2, the coil 350 is wound around the outer circumferential surface of the valve body 100, for example, the outer circumferential surfaces of the first piece 110 and the second piece 120. Of course, the coil 350 does not have to be wound around the outer circumferential surfaces of the first piece 110 and the second piece 120 as shown in FIG. 2, and may be wound only on the outer circumferential surface of the first piece 110. Could be In order to support the lower side of the coil 350, one point of the outer circumferential surface of the valve body 100, for example, one point of the outer circumferential surface of the second piece 120, is illustrated in FIGS. 2 to 3C. A flange 127 is formed which protrudes outward along the radial direction of 100.

The flange 127 may support the lower end of the coil 350, but the second yoke 400 is provided in the electromagnetic fluid flow control valve according to the present invention as shown in FIGS. As described above, the lower end of the second yoke 400 is supported. On the other hand, the flange 127 not only serves to support the lower end of the coil 350 or the second yoke 400, but also plays an important role in determining the exact position to which they are to be coupled. Therefore, when the flange 127 is formed, the assemblability is further improved.

On the other hand, an electrical circuit (not shown) is connected to the coil 350. The electric circuit is provided to apply a current to the coil 350, and anyone skilled in the art knows that the electric circuit is connected to the coil, which is not particularly shown in the drawings. .

The electrical circuit may include a circuit capable of arbitrarily adjusting the strength and direction of the current supplied to the coil 350. Then, the direction in which the permanent magnet 200 moves, that is, the upper direction or the lower direction, may be determined by determining the direction of the current applied to the coil 350. In addition, it is possible to adjust the distance that the permanent magnet 200 moves by adjusting the strength of the current. Being able to easily adjust the distance to move the permanent magnet 200 means that the amount of fluid passing through the orifice 131 can be easily adjusted.

An example of a circuit that can arbitrarily adjust the strength and direction of the current as described above includes an analog current control circuit and a pulse width modulation circuit (PWM circuit) for adjusting the direction and intensity of the current. Since the analog current control circuit and the pulse width modulation circuit are well known technologies that are widely used at present, detailed descriptions thereof will be omitted. For simplicity, the analog current control circuit applies the direction and magnitude of the current corresponding to the required moving displacement of the permanent magnet to the winding coil in response to a control voltage input. The pulse width modulation circuit is a circuit for adjusting the intensity of the current by arbitrarily adjusting the period and pulse width of the digitized applied current. Therefore, the electrical circuit connected to the coil 350 preferably includes the analog current control circuit or the pulse width modulation circuit. However, the electric circuit used in the present invention is not limited thereto, and may be used as long as the strength and direction of the current can be arbitrarily adjusted.

On the other hand, the electric circuit may include a circuit that can apply a current of a predetermined strength to the coil 350. In this case, since a current of a certain intensity is applied to the coil 350, the displacement of the permanent magnet 200 and the needle 240 is always the same. If the electrical circuit is configured in this way, the needle 240 can operate as a bistable on / off valve that merely opens and closes the orifice 131. Of course, in this case, even if the strength of the current is determined, it is better to comprise a circuit which can change the direction of the current. Since the technique of changing the direction of the current applied to the coil 350 is also a general technique that has been used for a long time, description thereof will be omitted.

In the present invention, the permanent magnet 200 is maintained in a state in which the floating in the space 111 in the valve body 100 by the magnetic force. To this end, a first yoke 300 (yoke) is installed on the outer circumferential surface of the valve body 100, more specifically, on the outer circumferential surface of the first piece 110 as illustrated in FIGS. 1 to 3C. The first yoke 300 is made of a material having a high permeability such as pure iron so as to focus the magnetic field on the upper end of the permanent magnet 200, and is illustrated in FIG. 2. As described above, it is installed to surround the outer circumferential surface of the first piece 110 at a position corresponding to the upper portion of the permanent magnet 200. The first yoke 300 is formed in a cylindrical shape, for example.

When the first yoke 300 having a high magnetic permeability is provided as described above, the magnetic field in the upper portion of the permanent magnet 200 is concentrated to the upper portion of the first yoke 300. Therefore, the upper end of the permanent magnet 200 by the focused magnetic field is to stay in the state maintaining the shortest distance with the upper end of the first yoke (300). Accordingly, the upper end of the permanent magnet 200 is maintained by the magnetic force at the same altitude as the upper end of the first yoke 300, as shown in FIG. Accordingly, even when a current is not applied to the coil 350, the needle 240 connected to the permanent magnet 200 may maintain the suspended state in the air while maintaining a predetermined distance from the orifice 131. Will be. In addition, the first yoke 300 provides a force to restore the permanent magnet 200 to its original position when a current is applied to the coil 350. This principle will be described in more detail with reference to FIGS. 5-7B.

Meanwhile, the electromagnetic fluid flow control valve according to the present invention may further include a second yoke 400 as illustrated in FIGS. 2 and 3C. The second yoke 400 is provided to increase the magnetic flux density in the valve body 100 by further focusing the magnetic field around the permanent magnet 200. As such, when the magnetic flux density in the valve body 100 is increased, the magnetic force applied to the permanent magnet 200 becomes stronger, so that the permanent magnet 200 is suspended in the space 111 without falling downward due to its own weight. State can be maintained. In addition, when the second yoke 400 is provided, a design change such as reducing the size of the first yoke 300 becomes possible.

The second yoke 400 is preferably made of a material having a high permeability similar to the first yoke 300. The second yoke 400 is coupled to the outer circumferential surface of the valve body 100 and is installed to surround the coil 350. The second yoke 400 installed as described above may be installed to be in close contact with the flange 127 of the valve body 100, and the upper end may be installed to be in close contact with the first yoke 300.

Since the coil 350 is accommodated in the second yoke 400, a structure for better assembling of the electromagnetic fluid flow control valve according to the present invention is required. Accordingly, in the present invention, as shown in FIGS. 2 and 3, the second yoke 400 has a two-piece structure. When the second yoke 400 is composed of two pieces, that is, the upper piece 410 and the lower piece 430, the coil 350 wound around the outer circumferential surface of the valve body 100 can be easily received therein. Since it becomes possible, assembling property is improved further. Here, the upper piece 410 is installed to surround the upper portion of the coil 350, the lower piece 430 is installed to surround the lower portion of the coil 350.

On the other hand, when the electromagnetic fluid flow control valve according to the present invention has the above structure, the permanent magnet 200, the rod 230 and the needle 240 is moved in the vertical direction in the state supported by the electromagnetic force. However, if the shape machining error and assembly error that can occur when manufacturing or assembling parts is large, the permanent magnet 200 and the rod 230 and the needle 240 does not move exactly in the vertical direction along the vertical axis, one side Eccentricity may occur that is biased upward. When such an eccentric phenomenon occurs, since the permanent magnet 200, the rod 230 and the needle 240 may contact the inner wall surface of the valve body 100, accurate operation is difficult and life expectancy is expected to be shortened by wear. Therefore, the present invention suggests an improvement for solving such a problem.

In order to solve the above problems, the electromagnetic fluid flow control valve according to the present invention includes components moving upward and downward by electromagnetic force, that is, the permanent magnet 200, the rod 230, and the needle 240. Springs (160, 170) for guiding to move in the vertical direction accurately along the vertical axis may be further provided. The springs 160 and 170 not only guide the movement of the parts, but also provide a restoring force for returning to the original position when the parts move upward or downward. The springs 160 and 170 are preferably made of a nonmagnetic material so as not to affect the magnetic field formed by the permanent magnet 200. Hereinafter, the structure of the springs 160 and 170 performing this role will be described in more detail with reference to the drawings.

In the present invention, at least one spring (160, 170) is provided, it is installed to support the load (230). 2 and 3b illustrate an embodiment in which two springs 160, 170 support the rod 230. For convenience of explanation, hereinafter supporting the upper portion of the rod 230 is referred to as the first spring 160 and supporting the lower side is referred to as the second spring 170. The first spring 160 and the second spring 170 has the same structure, a portion of which is fixed to the outer circumferential surface of the rod 230 and the inner circumferential surface of the valve body 100, respectively. To this end, the first and second springs 160 and 170 may include first rings 161 and 171 fixed to the valve body 100 and second rings 163 and 173 fixed to the rod 230. And a plurality of suspenders 165 and 175 connecting the first rings 161 and 171 to the second rings 163 and 173.

The inner circumferential surface diameters of the first rings 161 and 171 are larger than the outer circumferential surface diameters of the second rings 163 and 173. The inner circumferential surface diameters of the second rings 163 and 173 may be sized such that the outer circumferential surface of the rod 230 is press-fitted and fixed. Here, the installation position of the first spring 160 and the second spring 170 is different from each other. Therefore, when the outer circumferential surface diameter of the rod 230 is formed differently for each part, the inner circumferential diameter of the second ring of the first spring 160 and the second ring of the second spring 170 may be formed differently. have. Meanwhile, as illustrated in FIG. 3B, a plurality of suspenders 165 and 175 are radially disposed between the first rings 161 and 171 and the second rings 163 and 173 so that the first rings 161, The inner circumferential surface of 171 and the outer circumferential surface of the second rings 163 and 173 are connected.

In the springs 160 and 170 having the above-described configuration, the suspenders 165 and 175 may include the first rings 161 and 171 and the first rings to prevent the second rings 163 and 173 from moving in the radial direction. It has a large stiffness in the radial direction of the two rings 163 and 173. Then, the rods 230 accommodated in the second rings 163 and 173 may also not move in the radial direction of the first rings 161 and 171 and the second rings 163 and 173, and thus the rods 230 may not be moved. The needle 240 and the permanent magnet 200 may be prevented from contacting the inner circumferential surface of the valve body 100.

Meanwhile, the suspenders 165 and 175 also have elasticity in the vertical direction of the first rings 161 and 171 and the second rings 163 and 173. Then, since the second rings 163 and 173 may move in the vertical direction while the first rings 161 and 171 are fixed, the rod 230 may be effectively guided in the vertical movement. In addition, since the suspenders 165 and 175 deform and accumulate elastic energy when the rod 230 moves in the up and down direction, the rod 230 may give a restoring force to return to its original position when the electromagnetic force is removed. It becomes possible.

Among the springs 160 and 170 having the above structure, the first spring 160 is installed to support the upper end of the rod 230 passing through the permanent magnet 200 as shown in FIG. 3B. . To this end, an upper end of the rod 230 is inserted into and fixed to the second ring 163 of the first spring 160, and the first ring 161 of the first spring 160 is illustrated in FIG. 3A. As described above, the cap 150 is inserted into and fixed to the coupling portion of the limiter 140 (a limiter) to be described later. The second spring 170 is installed to support a lower end of the rod 230 connected to the needle 240. To this end, the second ring 173 of the second spring 170 is inserted into and fixed to the coupling portion of the rod 230 and the needle 240, as shown in FIG. The first ring 171 of 170 is inserted into and fixed to the coupling portion of the first piece 110 and the second piece 120. With the above structure, the first and second rings 161 and 171, 163 and 173 of the first and second springs 160 and 170 may be installed to the valve body 100 and the rod 230. Since no additional parts or structure are required, the structure is very simple and the assembly is greatly improved.

On the other hand, when the current is applied to the coil 350, the permanent magnet 200 may be excessively moved due to unexpected external factors when the permanent magnet 200 moves upward or downward. As such, when the amount of movement of the permanent magnets 200 is excessive, the suspenders 165 and 175 of the springs 160 and 170 may be permanently deformed to cause malfunction. Therefore, in order to secure more stable performance, it is necessary to limit the amount of upward movement of the permanent magnet 200.

To this end, a limiter 140 may be further installed in the valve according to the present invention as shown in FIGS. 2 and 3A. The limiter 140 reduces the horizontal cross-sectional area of the upper portion of the space 111 in which the permanent magnet 200 is installed to prevent the permanent magnet 200 from rising further. When the cap 150 is installed, the limiter 140 is disposed between the space 111 of the valve body 100 and the cap 150 and protrudes toward the inside of the valve body 100. do. And the limiter 140 has a protruding length that can be in contact with the upper surface of the permanent magnet 200 when the permanent magnet 200 is raised.

The limiter 140 has a ring shape. In this case, the inner circumference of the limiter 140 should be smaller than the outer circumference of the permanent magnet 200. Meanwhile, the jaw 116 is formed on the upper inner wall surface of the valve body 100 to support the lower end of the ring-shaped limiter 140 to accurately determine its installation position. Can be. However, the shape of the limiter 140 is not limited to a ring shape, but may be composed of a simple protrusion projecting inward from the inner wall of the valve body 100. The limiter 140 having the structure as described above is also preferably made of a nonmagnetic material in order not to affect the magnetic field formed by the permanent magnet 200.

Electromagnetic fluid flow control valve according to the present invention having the structure as described above is a normally open type valve (or normally open type), the orifice 131 is completely open in the state that the current is not applied to the coil 350, or The orifice 131 may be implemented as a normally closed type valve or the like. Of course, the orifice 131 may be implemented as a valve in a partially closed state. In order to implement such various types of valves, the initial position of the needle 240 is very important, and a method of determining the initial position of the needle 240 is also important. Hereinafter, the initial position of the needle 240 for each valve type and the structure proposed by the present invention to determine the same will be described with reference to FIGS. 4A and 4B. For reference, FIGS. 4A and 4B are views showing the vertical length of the first yoke and the position of the needle when the valve is manufactured as a normally open type and a normally closed type valve, respectively. FIG. 4A shows a top open valve in which the needle always opens the orifice when no current is applied, and FIG. 4B shows a top closed valve in which the needle always closes the orifice when no current is applied.

Referring to FIG. 4A, the needle 240 is disposed in the open valve without the tip portion 243 being inserted into the orifice 131. This is possible by the magnetic force acting on the permanent magnet 200 by the magnetic field formed by the permanent magnet 200, the force supported by the spring (160, 170) and the like. This principle has already been explained and will be omitted. 4B, the needle 240 has the tapered tip portion 243 disposed in close contact with the inlet of the orifice 131.

As described above, in order to arrange the initial positions of the needles 240 differently in a state where no current is applied to the coil 350, a structural change is required. With this structure change, the simplest is to adjust the vertical length of the first yoke 300 as shown in Figs. 4a and 4b. That is, when the coil 350 is wound in the same shape in two different valves, when the length from the top of the coil 350 to the top of the first yoke 300 is differently adjusted, the needle ( The initial position of 240 is determined differently. This is briefly explained.

4A and 4B, the vertical length L _o of the first yoke 300 of the valve of FIG. 4A is equal to the vertical length L _c of the first yoke 300 of the valve of FIG. 4B. It can be seen that it is formed longer. This means that the upper end of the first yoke 300 of FIG. 4A has a higher altitude than the upper end of the first yoke 300 of FIG. 4B. Therefore, in FIG. 4A, the magnetic field is concentrated at a high position, so that the permanent magnet 200 also floats to a high position, so that the needle 240 is disposed at a high position. On the contrary, in FIG. 4B, the magnetic field is concentrated at a low position, and thus the permanent magnet 200 also floats at a low position, so the needle 240 is disposed at a low position.

By the same principle as described above, when all parts except for the first yoke 300 have the same size as shown in FIGS. 4A and 4B, a simple structure change of changing the length of the first yoke 300 in the vertical direction is performed. It is very easy to implement an opening valve or a closing valve. Of course, if the vertical length of the first yoke 300 is properly designed, the needle 240 may be kept slightly inserted into the orifice 131. Unlike the above, the initial position of the needle 240 may be determined by changing the length of the rod 230 or the needle 240 in the vertical direction.

In the electromagnetic fluid flow valve according to the present invention having the structure as described above, a tube (not shown) is connected to each of the first port 135 and the second port 155. Here, if the tube connected to the first port 135 is called a first tube (not shown), and the tube connected to the second port 155 is a second tube, the first tube and the second tube Any one may function as an inlet tube into which the fluid is introduced and the other may function as an outlet tube through which the fluid is discharged.

For example, if a high pressure fluid is introduced into the valve body 100 through the first tube and then discharged through the orifice 131 via the second tube, the first tube is an inlet tube, and The second tube serves as a discharge tube. Of course, at this time, the first port 135 functions as an inlet port, and the second port 155 functions as an outlet port. On the contrary, if a high pressure fluid flows into the valve body 100 through the second pipe and then is discharged through the orifice 131 to the first pipe, the first pipe and the first port 135 are respectively introduced. As a pipe and an inlet port, the second pipe and the second port 155 function as a discharge pipe and a discharge port, respectively.

On the other hand, the present invention proposes a structure in which the temperature and pressure can be lowered after the fluid having a high pressure and temperature passes through the orifice 131. To this end, the diameter of the orifice 131 is smaller than the diameter of the first port 135. With such a structure, since the fluid having the high pressure and temperature introduced through the second port 155 passes through the orifice 131 and is discharged into a wide space, it is adiabaticly expanded and thus the pressure and temperature rapidly decrease. do. Meanwhile, the space 125 of the second piece 120 where the needle 240 is positioned is naturally larger than the diameter of the orifice 131. Therefore, even when a fluid having a high pressure and temperature is introduced through the first port 135, the fluid passes through the orifice 131 and thermally expands after the adiabatic expansion to decrease the temperature and pressure.

As described above, there are various types of fluids introduced into the valve body 100 and discharged to the outside after passing through the orifice 131. Examples of the fluid include a fluid in a gaseous state, a liquid state, and a mixture of the gas and liquid. In addition, there is a super critical fluid which has a wide range of use as recent research is conducted. For simplicity, the supercritical fluid is briefly described. When a fluid is subjected to pressures and temperatures above the threshold, the fluid is in a state where the distinction between gas and liquid is ambiguous. At this time, even if a higher pressure is applied, it does not become a liquid but becomes a non-condensable gas. This state is called supercritical, and the solvent in that state is called a supercritical fluid. This supercritical fluid has a value similar to the density of the liquid, the viscosity is close to the gas and the diffusion coefficient is about 100 times larger than the liquid.

On the other hand, the electromagnetic fluid flow control valve according to the present invention having the above structure is assembled as follows. First, the rod 230 is coupled to the permanent magnet 200. The permanent magnet 200 is inserted into and mounted on the first piece 110 of the valve body 100. After the permanent magnet 200 is mounted, the cap 150 is coupled after the limiter 140 and the first spring 160 are sequentially inserted into the upper portion of the first piece 110. The foregoing will be more readily understood with reference to FIG. 3A.

Next, the second ring 173 of the second spring 170 is inserted into the lower end of the rod 230, and then the needle 240 is coupled to the lower end of the rod 230. The second piece 120 is coupled to and fixed to the first piece 110. Then, the first ring 171 of the second spring 170 is firmly fixed between the first piece 110 and the second piece 120 screwed together, welded or press-fitted together, The second ring 173 of the second spring 170 is coupled to and fixed to the lower end of the rod 230. The third piece 130 is coupled to and fixed to the lower end of the second piece 120. This process will be more readily understood with reference to FIG. 3B.

When the assembly of the valve body 100 and the components installed therein is completed, the coil 350 and the second yoke 400 are mounted on the outer circumferential surface of the valve body 100. The first yoke 300 is mounted on an outer circumferential surface of the valve body 100 so as to be positioned above the second yoke 400. This process will be more readily understood with reference to FIG. 3C. The present invention has the advantage that the assembly is very easy because the structure is very simple as described above.

Hereinafter, the operating principle of the electromagnetic fluid flow control valve according to the present invention having the above-described structure will be described with reference to FIGS. 5 to 7B. For reference, FIGS. 7A and 7B are diagrams for showing a relationship between a magnetic field Bu formed according to a direction in which a current is applied to a coil and an electromagnetic force Fu (Fd) applied to a permanent magnet. Is a view showing a state when the current is applied to the coil in a counterclockwise direction when viewed from above, Figure 7b is a view showing a state when the current is applied in a clockwise direction when viewed from above.

First, referring to FIG. 5, when no current is applied to the coil 350, the permanent magnet 200 is injured so that its upper end is positioned at the same altitude as the upper end of the first yoke 300. Will be maintained. If this is explained in more detail as follows. The magnetic field around the upper end of the permanent magnet 200 is concentrated around the upper end of the first yoke 300. Therefore, the upper end of the permanent magnet 200 is to maintain the same position as the upper end of the first yoke 300 by the focused magnetic field. In this case, when the permanent magnet moves up and down along the Z axis of FIG. 5, the permanent magnet 200, the first yoke 300, and the second yoke 400 are surrounded by the permanent magnet 200. A strong magnetic field is formed, and the magnetic force Fm applied to the permanent magnet 200 by the magnetic field has an aspect as shown in FIG. 6. For reference, in FIG. 6, the value of the Z axis is the top height of the permanent magnet 200, and Z ₀ is the top height of the permanent magnet 200 when it is at the same height as the height of the top of the first yoke 300. to be.

Of the permanent magnet 200. If the position of the top is lower than the Z ₀ magnetic force acting upward, and the position is high, the magnetic force acting downward than Z ₀ at the top of the permanent magnet 200 as shown in Figure 6 do. In addition, when the permanent magnet 200 rises or falls outside the position of Z ₀ , elastic energy is accumulated in the springs 160 and 170 to restore the permanent magnet 200 to its original position. As described above, the permanent magnet 200 is maintained in a highly stable state when the current is not applied to the coil 350 by the magnetic force and the elastic restoring force of the springs 160 and 170.

When the current is applied to the coil 350 in the above state, the permanent magnet 200 moves upward or downward. Hereinafter, this principle will be described with reference to FIGS. 7A and 7B. 7A and 7B, M represents magnetic field intensity of the permanent magnet 200, and B _u and B _d represent induction fields generated when a current is applied to the coil 350. ). And F _u and F _d represent induced electromotive force generated when a current is applied to the coil 350.

Referring to FIG. 7A, when a current is applied to the coil 350 in a counterclockwise direction when the valve is viewed from above, an upward magnetic field B _u is induced in the valve body 100 by a magnetic induction rule. The magnitude of this induction magnetic field is proportional to the strength of the current applied to the coil 350. The permanent magnet 200 receives the induced electromotive force F _u acting upward. Therefore, the permanent magnet 200 rises upwards, and thus the needle 240 moves away from the orifice 131, thereby widening or completely opening the open area of the orifice 131.

On the other hand, when the permanent magnet 200 is raised by the induced electromotive force as described above, the permanent magnet 200 has a variety of restoring force has a size in proportion to the height of the permanent magnet 200 rises. The restoring force acting at this time is formed by the permanent magnet 200 and the first yoke 300 and the second yoke 400 to act on the permanent magnet 200 and the springs 160 and 170. There is elastic restoring force acting by). In addition, when the fluid flows in from the second port 155 and is discharged through the first port 135, the pressure drop due to the fluid passing through the orifice 131 together with the pressure of the fluid itself. Can be mentioned. Here, the pressure drop by the fluid will be briefly described.

When the needle 240 opens the orifice 131, the fluid flows downward through the orifice 131, and a pressure drop occurs in the flow direction of the fluid, that is, the downward direction. Due to this pressure drop, a predetermined force is applied to the needle 240, the rod 230, and the permanent magnet 200. Therefore, the force exerted by the pressure and the pressure drop of the fluid itself acts as a force to restore the permanent magnet 200 rising by the induced electromotive force. On the other hand, when the fluid is introduced through the first port 135 and then discharged through the second port 155, the fluid pressure is applied upward. Therefore, in this case, since the pressure of the fluid raises the permanent magnet 200, it acts as a lifting force rather than a restoring force.

Therefore, when a current is applied to the coil 350 as described above, the permanent magnet 200 rises, and the induced electromotive force for raising the permanent magnet 200 and the restoring forces for restoring the permanent magnet 200 are balanced. At the point where the permanent magnet 200 is stopped. Therefore, when the current is continuously applied to the coil 350, the needle 240 can open the orifice 131 while maintaining the elevated state with the permanent magnet 200.

On the other hand, if the intensity of the current applied to the coil 350 is adjusted differently, since the intensity of the induced electromotive force is changed, the needle 240 is located at a new point where the intensity of the changed induced electromotive force and the restoring force are balanced. . Then, the tip portion 243 of the needle 240 is moved to linearly change the open area of the orifice 131, that is, the effective area through which the fluid can pass. Accordingly, the valve according to the present invention can adjust the flow rate of the fluid passing through the orifice 131 very easily by adjusting the strength of the current applied to the coil 350. On the other hand, in the case shown in Figure 7a, the needle 240 is slightly inserted into the orifice 131 when no current is applied to the upper valve or coil 350 as shown in Figure 4b Valid for valves designed to

Referring to FIG. 7B, when a current is applied to the coil 350 in a clockwise direction when the valve is viewed from above, a magnetic field B _d of the downward direction is induced in the valve body 100 by a magnetic induction law. The magnitude of the induction magnetic field is proportional to the strength of the current applied to the coil 350. The permanent magnet 200 receives the induced electromotive force F _d acting downward. Therefore, the permanent magnet 200 is lowered downward, and thus the needle 240 is closer to the orifice 131, thereby narrowing or completely closing the open area of the orifice 131.

In the case of FIG. 7B, the restoring force is generated when the permanent magnet 200 moves as in the case of FIG. 7A. Therefore, the permanent magnet 200 descends to the point where the induced electromotive force and the restoring force are in equilibrium with each other. Accordingly, the needle 240 is also lowered together to reduce or completely close the open area of the orifice 131. Therefore, by using the present invention it is possible to effectively control the amount of fluid passing through the orifice 131 even when a current is given in the direction as shown in FIG. In the case illustrated in FIG. 7B, the needle 240 is slightly inserted into the orifice 131 when no current is applied to the upper valve or the coil 350 as illustrated in FIG. 4A. Valid for valves designed to

On the other hand, as shown in FIGS. 7A and 7B, when the current is stopped while the current is applied to the coil 350, the permanent magnet 200 and the needle 240 return to their original positions by the restoring force. At this time, if the interruption while gradually reducing the amount of current applied to the problems caused by a sudden return, for example, excessive force is applied to the spring (160, 170) or sudden return of the permanent magnet 200 needle 240 and the orifice ( 131) It is possible to effectively prevent problems such as noise generated by the inlet or the permanent magnet 200 and the limiter 140 collide with each other, and malfunction or damage.

As described above, the fluid flow control valve according to the present invention may be implemented as a linear expansion valve which can linearly adjust the flow amount of the fluid by adjusting the direction and intensity of the current. And it may be implemented as an on-off valve for opening or closing the orifice 131 when the current is applied. The electromagnetic fluid flow control valve according to the present invention can be widely applied to many fields for controlling fluid flowing in a pipe, such as a linear expansion valve using an adiabatic expansion action of a fluid such as an air conditioner or a refrigerator. In addition, it can be applied to control the flow of gas to maintain the proper internal pressure of the car tire. And it can also be applied as a control valve for regulating the boost pressure of the fuel injection device for an automotive electronic control engine. In addition, the present invention can be applied to a hydraulic control device, an active suspension, an hydraulic suspension device, and a pressure control device of an automatic braking system of an automatic vehicle transmission. In addition, it can be widely applied to many fields for controlling the fluid flowing in the tube, such as a linear expansion valve using the adiabatic expansion action of the fluid, such as air conditioner refrigerator.

Although several embodiments have been described above, it will be apparent to those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit and scope thereof. Accordingly, the described embodiments are to be considered as illustrative and not restrictive, and all embodiments within the scope of the appended claims and their equivalents are included within the scope of the present invention.

The present invention described above has the following effects.

First, assembly is very easy because the structure is simple and each part is designed to have a very organic coupling relationship. Therefore, assembly and workability are easy and productivity is improved. This lowers the manufacturing price has the effect of increasing the economics.

Second, the opening area of the orifice through which the fluid passes can be changed linearly by adjusting the direction and intensity of the current applied to the coil. This makes it possible to very easily control the amount of fluid flowing.

Third, when the strength of the current applied to the coil is fixed, the needle opens or closes the orifice when the current is applied to the coil. Accordingly, it can also be used as an on / off valve for opening and closing the orifice 131.

Fourth, because the operation by the electromagnetic force is faster than the conventional responsiveness and ensures the reliability in operation.

Fifth, the components operating in the part with the fluid and the components which operate them conventionally do not need to be mechanically or electrically connected. Therefore, the sealing property is improved than the conventional valves.

Sixth, in the valve according to the present invention, two ports to which the pipe is connected are formed at the top and bottom of the valve body. Therefore, the valve according to the present invention is very useful when it is necessary to install the control valve in the portion where the flow path does not change. With this structure, the space required for installation can be significantly reduced.

Seventh, there is no need to install a separate actuator (actuator) in the valve according to the invention. Therefore, the size can be made smaller than the valves of the conventional structure has the advantage that the size of the entire device can be compact.

The advantages described in describing the configuration of the present invention are also included in the advantages of the present invention.

Claims (37)

A valve body having a first port formed at a lower end, a second port formed at an upper end, an orifice formed therein to communicate the first and second ports, and a space inside the upper side. Wow; A permanent magnet installed in the space to be movable in the vertical direction and having at least one fluid passage hole formed in the vertical direction; A coil connected to an electric circuit and wound around an outer circumferential surface of the valve body; A first yoke installed to surround an outer circumferential surface of the valve body at a position corresponding to an upper portion of the permanent magnet to maintain the permanent magnet in a floating state in the space by a magnetic force; A tapered tip is disposed to correspond to one side of the orifice, and moves together when the permanent magnet moves upward or downward by an electromagnetic force generated when an electric current is applied to the coil. An electromagnetic fluid flow control valve comprising a needle that changes the open area linearly. The method of claim 1, The valve body is an electromagnetic fluid flow control valve made of a long cylindrical in the vertical direction. The method of claim 1, Said valve body comprises three detachable pieces. The method of claim 3, wherein The valve body, A first piece in which the coil and the first yoke are coupled to an outer circumferential surface and the permanent magnet is accommodated therein, and the second port is formed at an upper end thereof; A second piece having an upper end and a lower end open, the coil wound around a portion of an outer circumferential surface thereof, and coupled to a lower end of the first piece so that the needle is positioned in an inner cavity; An electromagnetic fluid flow control valve having a third piece coupled to the bottom of the second piece such that the orifice is formed therein and the first port is formed at the bottom and the needle is disposed at a position corresponding to the orifice. . The method of claim 4, wherein And the first piece and the second piece are made of a nonmagnetic substance. The method of claim 1, And the first port and the second port are formed on the same imaginary line. The method of claim 1, And the needle is coupled to a lower end of a rod installed to penetrate the permanent magnet and moves together with the permanent magnet. The method of claim 7, wherein The rod is a non-magnetic electromagnetic fluid flow control valve. The method of claim 1, And said needle is directly connected to said permanent magnet. The method of claim 1, An electromagnetic fluid flow control valve having a detachable cap fixed to an upper end of the valve body, wherein the second port is formed in a vertical direction at a center thereof. The method of claim 10, The cap is an electromagnetic fluid flow control valve made of a non-magnetic material. The method of claim 10, Electromagnetic fluid flow control valve is provided between the cap and the permanent magnet to reduce the horizontal cross-sectional area of the space, limiter (limiter) for limiting the rising height of the permanent magnet. The method of claim 12 The limiter is an electromagnetic fluid flow control valve made of a ring having an inner circumference smaller than the outer circumference of the permanent magnet. 13. The electromagnetic fluid flow control valve of claim 12, wherein the limiter is made of nonmagnetic material. The method of claim 1, Electromagnetic fluid flow control valve is installed on the upper side of the space to reduce the horizontal cross-sectional area of the space further comprises a limiter (limiter) for limiting the rising height of the permanent magnet. The method of claim 1, The first yoke is an electromagnetic fluid flow control valve made of a high permeability (substance). The method of claim 1, And a second yoke coupled to an outer circumferential surface of the valve body and installed to surround the coil. The method of claim 17, The second yoke is an electromagnetic fluid flow control valve made of a high permeability material. The method of claim 17, The second yoke, An upper piece installed to surround the upper portion of the coil; An electromagnetic fluid flow control valve coupled to the lower side of the upper piece and comprising a lower piece surrounding the lower portion of the coil. The method of claim 7, wherein A portion is fixed to the valve body and the rod, respectively, to restore the permanent magnet to its original position while preventing the permanent magnet, the rod or the needle from contacting the inner wall of the valve body when the permanent magnet moves. Electromagnetic fluid flow control valve further comprises at least one spring to impart. The method of claim 20, The spring is, A first spring for supporting an upper end of the rod passing through the permanent magnet; And a second spring for supporting a lower end of the rod connected to the needle. The method of claim 20, Each spring is, A first ring fixed to the valve body; A second ring disposed inside the first ring and fitted with an inner circumferential surface of the rod; Electrons formed by connecting the first ring and the second ring, having suspenders (elastic suspenders) in the vertical direction of the first ring having a large stiffness in the radial direction of the first ring Air flow control valve. The method of claim 20, Each spring is an electromagnetic fluid flow control valve made of a non-magnetic material. The method of claim 1, The flow path is an electromagnetic fluid flow control valve is disposed in the radial plurality of the permanent magnet. The method of claim 1, And the needle is arranged to close the orifice in the absence of current applied to the coil. The method of claim 1, And the needle is arranged to completely open the orifice in the absence of current applied to the coil. The method of claim 1, And the needle is disposed such that the tip portion occupies a part of the open area of the orifice without a current applied to the coil. The method of claim 1, And the electric circuit is a circuit capable of arbitrarily adjusting the strength and direction of the current supplied to the coil so that the needle linearly increases or decreases the open area of the orifice. The method of claim 27, The electrical circuit comprises a pulse width modulation circuit (PWM circuit) capable of arbitrarily adjusting the period and pulse width of the digitized applied current. The method of claim 1, Wherein the electrical circuit is a circuit capable of applying a current having a predetermined strength to the coil such that the needle can act as a bistable on / off valve to open or close the orifice. Air flow control valve. The method of claim 1, The first port is connected to an inlet tube through which a high pressure fluid flows, and the second port is connected to an outlet tube through which the fluid passing through the orifice is discharged. valve. The method of claim 30, And the diameter of the orifice is smaller than the diameter of the first port such that the pressure and temperature of the fluid drop after passing through the orifice. The method of claim 1, The second port is connected to an inlet tube through which a high pressure fluid flows, and the first port is connected to an outlet tube through which the fluid passing through the orifice is discharged. valve. The method of claim 1, The fluid flowing into the valve body and discharged to the outside after passing through the orifice is an electromagnetic fluid flow control valve made of a gas state. The method of claim 1, And the fluid flowing into the valve body and discharged to the outside after passing through the orifice is in a liquid state. The method of claim 1, And a fluid flowing into the valve body and discharged to the outside after passing through the orifice is a mixture of gas and liquid. The method of claim 1, And the fluid flowing into the valve body and discharged to the outside after passing through the orifice is a super critical fluid.

Images