CN110701319B

CN110701319B - Vortex driven valve

Info

Publication number: CN110701319B
Application number: CN201910942060.8A
Authority: CN
Inventors: 王彬彬; 谭熠; 王卓; 高喆; 王文浩
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-11-17
Anticipated expiration: 2039-09-30
Also published as: CN110701319A

Abstract

The invention discloses a vortex driven valve, which comprises a valve disc, a coil assembly and a power supply control unit, wherein the valve disc is provided with a first working position for shielding an air outlet and a second working position for opening the air outlet; the coil assembly is arranged on one side of the valve disc facing the air outlet, and an elastic reset piece is arranged on one side of the valve disc far away from the air outlet; the power supply control unit is electrically connected with the coil assembly and supplies pulse current to the coil assembly. The eddy current driving valve provided by the invention leads variable pulse current into the coil through the power supply control unit, and eddy current can be generated in the valve disc due to the Faraday effect and can enable the valve disc to bear the ampere force far away from the coil. Because the ampere force is greater than the elasticity of the elastic reset piece, the valve disc is positioned at the second working position, and the air outlet is opened. The power supply control unit is connected with a pulse signal, so that the power supply control unit can control the current in the coil assembly, and further realize the adjustment of the air outlet frequency and the response time of the vortex driven valve.

Description

Vortex driven valve

Technical Field

The invention relates to the field of valves, in particular to a vortex driven valve.

Background

Fast response (millisecond) high velocity airflow (supersonic) is desirable in many areas. Particularly in the field of magnetic confinement nuclear fusion, the rapid and effective feeding of gaseous fuel into a designated area is a basic requirement for maintaining stable operation of nuclear fusion plasma. To meet this requirement, the feed gas flow rate should be as high as possible, and supersonic velocities (-2 km/s) ensure that a larger portion of the gas enters the plasma rather than being adsorbed by the vacuum chamber walls. In addition, various instabilities can occur during operation of the magnetically confined nuclear fusion device. If one were able to respond quickly and feed gaseous fuel into a fusion plasma in milliseconds, it would help control the density and temperature distribution of the plasma, better suppressing instabilities.

Many magnetic confinement nuclear fusion devices use piezoelectric crystal valves for air intake. The valve has strong regulating capacity, the response can be about 10ms, but the air inlet quantity is small, the speed of the emergent gas flow is slow, the air inlet efficiency is low, and often only 10 percent of gas molecules are fed into the plasma. Because many parts use materials with high air-out rate, the piezoelectric crystal valve is not suitable for being arranged in a vacuum chamber.

Disclosure of Invention

Technical problem to be solved

The invention aims to provide a vortex driven valve to solve the problems of low air outlet frequency and slow response time of the valve in the prior art.

(II) technical scheme

In order to solve the above technical problem, the present invention provides an eddy current driven valve. The vortex driven valve comprises a valve disc, a coil assembly and a power supply control unit, wherein the valve disc is provided with a first working position for shielding an air outlet and a second working position for opening the air outlet; the coil assembly is arranged on one side, facing the air outlet, of the valve disc, and an elastic resetting piece is arranged on one side, far away from the air outlet, of the valve disc; the power supply control unit is electrically connected with the coil assembly and provides pulse current to the coil assembly.

Further, the vortex driven valve comprises an upper cover body, a lower cover body and an intermediate cover body connected between the upper cover body and the lower cover body, wherein the lower cover body and the intermediate cover body form a first valve cavity, and the upper cover body and the intermediate cover body form a second valve cavity.

Further, the coil assembly includes a plurality of layers of coils, each layer of the coils being cured with a thermosetting low outgassing rate epoxy material, the plurality of layers of the coils being disposed within the first valve chamber.

Further, the coil is formed by warp cutting of the conductive material.

Further, the air outlet is a Laval nozzle.

Furthermore, the elastic resetting piece is arranged in the second valve cavity, and two ends of the elastic resetting piece are respectively abutted against the valve disc and the inner wall of the valve cavity.

Further, the valve is driven to vortex still includes insulating assembly, insulating assembly includes ceramic isolation layer and polyimide film, the ceramic isolation layer sets up coil pack with between the first valve pocket, polyimide sets up coil pack with between the middle lid.

Further, sealing rings are arranged between the upper cover body and the middle cover body and between the valve disc and the middle cover body.

Furthermore, the upper cover body is connected with alumina ceramics, a connecting wire is arranged in the alumina ceramics, and the coil assembly is electrically connected with the power supply control unit through the connecting wire.

Further, the valve disc is made of an electrically conductive material.

(III) advantageous effects

The eddy current driving valve provided by the invention leads pulse current to the coil through the power supply control unit, so that the coil can generate variable current, eddy current can be generated in the valve disc due to the Faraday effect, and the valve disc can bear the ampere force far away from the coil due to the eddy current. Because ampere force is greater than the elasticity of elasticity piece that resets, so can make the valve disc be located the second work position, and then make the gas outlet open. At this point, the working gas flows into the gas outlet and out of the valve for use. When the current in the coil disappears, the ampere force of the valve disc disappears, and the elastic force of the elastic resetting piece can push the valve disc to press the air outlet again, so that the vortex driven valve is closed. In addition, because the power supply control unit is connected with the pulse signal, the power supply control unit can control the current in the coil assembly, and further realize the adjustment of the air outlet frequency and the response time of the vortex driven valve. All parts of the valve are made of materials with low air outlet rate and are pre-compressed by adopting a spring array, so that the whole valve can be arranged in an ultrahigh/high vacuum environment. And the valve is designed in a miniaturized way, so that excessive space in the vacuum chamber is not occupied, and the valve is convenient to install in the vacuum chamber. The Laval nozzle design of the outlet can ensure that the ultrasonic molecular beam can be directly ejected from the outlet of the valve.

Drawings

FIG. 1 is a schematic cross-sectional view of an eddy current actuated valve provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a power supply control unit according to an embodiment of the present invention.

The reference numbers illustrate:

1. a valve disc; 2. an air outlet; 3. an elastic reset member; 4. a coil; 5. a first valve chamber; 6. A lower cover body; 7. a middle cover body; 8. a second valve cavity; 9. an upper cover body; 10. a ceramic isolation layer; 11. a polyimide film; 12. a seal ring; 13. an alumina ceramic; 14. a connecting wire; 15. An air inlet; 16. an IGBT module; 17. a first resistor; 18. a first capacitor; 19. a second capacitor; 20. a first diode; 21. a second resistor; 22. a third capacitor; 23. a second diode; 24. and the coil assembly is equivalent circuit.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

With combined reference to fig. 1 and 2, the valve driven by eddy current includes a valve disc 1, a coil assembly and a power supply control unit, the valve disc 1 has a first working position for shielding the air outlet 2 and a second working position for opening the air outlet 2; the coil assembly is arranged on one side of the valve disc 1 facing the air outlet 2, and an elastic resetting piece 3 is arranged on one side of the valve disc 1 far away from the air outlet 2; the power supply control unit is electrically connected with the coil assembly and supplies pulse current to the coil assembly.

The eddy current driven valve provided by the invention leads pulse current to the coil 4 through the power supply control unit, so that the coil 4 can generate variable current, eddy current can be generated in the valve disc 1 due to the Faraday effect, and the eddy current can enable the valve disc 1 to bear the ampere force far away from the coil 4. Since the ampere force is greater than the elastic force of the elastic restoring element 3, the valve disk 1 is moved into the second operating position, and the air outlet 2 is opened. At this point, the working gas will flow out of the valve through the outlet 2 to be used. When the current in the coil 4 disappears, the ampere force of the valve disc 1 disappears, and the elastic force of the elastic resetting piece 3 pushes the valve disc 1 to press the air outlet 2 again, so that the eddy current driven valve is closed. In addition, because the power supply control unit inputs the pulse signal into the coil 4, the adjustment of the air outlet frequency of the vortex driven valve can be realized by adjusting the pulse signal. All parts of the valve are made of materials with low air outlet rate and are pre-compacted by adopting a spring array, so that the whole vortex driven valve can be arranged in an ultrahigh/high vacuum environment. And the vortex driven valve is miniaturized, does not occupy excessive space in the vacuum chamber, and is convenient to install in the vacuum chamber. The Laval nozzle design of the outlet can ensure that the ultrasonic molecular beam can be directly ejected from the outlet of the valve.

Specifically, in the present embodiment, the vortex driven valve has a valve body, and the valve disc 1 has two working positions: when the valve disc 1 is positioned at the first working position, the valve disc 1 can shield the air outlet 2, so that high-pressure air cannot flow out of the vortex driven valve when entering the valve body; when the valve disc 1 is located the second work position, the valve disc 1 will not shield the gas outlet 2, that is to say, at this moment, the gas outlet 2 is in the state of opening, so, when high-pressure gas gets into the valve body, can flow out this vortex drive valve through the gas outlet 2.

The coil 4 provided in the eddy current driven valve functions to provide an external force to the valve disc 1 to drive the valve disc 1 to move from the first operating position to the second operating position. Wherein the coil 4 is arranged on the side of the valve disc 1 facing the air outlet 2. That is, as shown in fig. 1, the coil 4 provides an upward external force to the valve disk 1.

The elastic reset piece 3 arranged in the eddy current drive valve has the function of providing external force for the valve disc 1 to drive the valve disc 1 to return from the second working position to the first working position. Wherein, the elastic reset piece 3 is arranged on one side of the valve disc 1 far away from the air outlet 2. That is, as shown in fig. 1, the elastic restoring member 3 provides a downward external force to the valve disc 1.

Generally speaking, when the vortex driven valve is in a non-working state, the valve disc 1 is in a second working position; when the vortex driven valve is in working state, the valve disc 1 is reciprocated between the first working position and the second working position.

How the coil 4 provides an external force to the valve disc 1 will be explained below:

when the power supply control unit supplies a pulse current to the coil 4, eddy currents are generated in the valve disc 1 due to the faraday effect, and the eddy currents can enable the valve disc 1 to bear the ampere force far away from the coil 4. Since the ampere force is much greater than the elastic force of the spring, the valve disc 1 moves from the first working position to the second working position, so that the air outlet 2 is opened. At this time, the working gas flows into the outlet 2 through the vortex-actuated valve and flows out of the vortex-actuated valve.

When the power supply control unit does not electrify the coil 4, the eddy current in the valve disc 1 disappears, the ampere force further disappears, and the valve disc 1 moves from the second working position to the first working position under the action of the elastic restoring force, so that the air outlet 2 is shielded. At this time, the working gas is sealed in the vortex driven valve.

Since the power supply control unit supplies the pulse current to the coil 4, the adjustment of the air outlet frequency and the response time of the eddy current driven valve can be completed by adjusting the frequency of the pulse current, namely by adjusting the corresponding frequencies of the high level and the low level of the control signal.

Particularly, when the vortex driven valve is applied to the operating environment of Tokamak, the vortex driven valve can be quickly opened and closed with the action time of less than 1ms, and accurate air intake is realized. Make working gas can more quick arrival expectation region on the one hand, on the other hand makes working gas possess stronger plasma and pierces through the effect, promotes the efficiency of tonifying qi.

Preferably, the valve disc 1 is made of an electrically conductive material. For example, an aluminum alloy material may be used to form the valve disc 1, which may ensure a high electrical conductivity of the valve disc 1, and in addition, may provide advantages such as light weight and the ability to form larger vortices.

As shown in fig. 2, the following describes a power supply control unit according to an embodiment of the present invention:

in the power supply control unit provided in the embodiment of the present invention, a pulse signal may be sent to the IGBT (insulated gate bipolar transistor) module 16 through a signal generator or a single chip microcomputer, the IGBT module 16 in this embodiment may use the IGBT module 16 in the prior art, and the IGBT module 16 may play a role of switching in the power supply control unit.

The IGBT module 16 is connected in parallel with an RC snubber circuit provided for the purpose of preventing parasitic stray inductance, and the first resistor 17 is connected in series with the first capacitor 18, whereby voltage spikes can be suppressed and the IGBT module 16 can be protected.

The second capacitor 19 is connected in series on the left side of the IGBT module 16, the first diode 20 is connected in parallel on the capacitor, and the second capacitor 19 is provided to charge the second capacitor 19 through the adjustable dc power supply in the work process, and the IGBT module 16 is controlled to be turned on and off through the pulse gate circuit, so that the second capacitor 19 is an energy storage capacitor with a relatively large capacity. The first diode 20 is provided to prevent the adjustable dc power supply from charging the second capacitor 19 backwards.

When the control pulse rises to a high level, the IGBT module 16 is turned on, and the current in the coil assembly starts to rise; after a set time, the pulse falls back to a low level, so that the IGBT module 16 starts to turn off and the current starts to drop. Since the energy storage of the second capacitor 19 is large, the electric quantity on the second capacitor 19 can meet the requirement that the IGBT module 16 is turned on for multiple times.

According to one embodiment of the present invention, the coil assembly includes a 4-layer coil 4, and the inductance value of the 4-layer coil 4 is large, so that an RCD snubber circuit is provided, which is formed by connecting a second resistor 21 in parallel with a third capacitor 22 and then in series with a second diode 23.

And the coil block equivalent circuit 24 in the power supply control unit corresponds to the coil block in the eddy current driven valve.

By controlling the IGBT module 16 with a level signal, a plurality of accurate pulse currents can be formed in the coil 4, which meets the requirement of high-frequency on-off of the eddy current driven valve, and thus completes the adjustment of the air-out frequency, response time, and ventilation volume of the eddy current driven valve.

In the present embodiment, the eddy current driven valve includes an upper cover 9, a lower cover 6, and an intermediate cover 7 connected between the upper cover 9 and the lower cover 6, the lower cover 6 and the intermediate cover 7 constitute a first valve chamber 5, and the upper cover 9 and the intermediate cover 7 constitute a second valve chamber 8.

Furthermore, the upper cover 9 is connected with alumina ceramics 13, a connecting wire 14 is arranged in the alumina ceramics 13, and the coil assembly is electrically connected with the power supply control unit through the connecting wire 14.

The coil assembly is led out at the side of the eddy current driven valve and connected to a connecting line 14 in vacuum inside the alumina ceramic 13.

In the preferred embodiment, the coil assembly comprises a plurality of layers of coils 4, each layer of coils 4 being connected by a thermosetting low outgassing epoxy material cure, the plurality of layers of coils 4 being disposed within the first valve chamber 5.

The main differences between the coil 4 in this embodiment and the coil 4 in the prior art are: the coil assembly in the embodiment is formed by adding a plurality of layers of coils 4, and the adjacent two layers of coils 4 can be fixedly connected by welding and other modes. Preferably, the coil assembly comprises a 4-layer coil 4, which may increase the magnetic field formed in the coil 4. Whereas the prior art coil 4 is a single layer coil 4. Thus, the volume size of the vortex driven valve can be reduced. Wherein, coil 4 is made by conducting material through wire cutting, forms coil 4 through using the mode of wire cutting for coil 4 has the characteristics that thickness is little, dimensional accuracy is high. And further ensures that the vortex driven valve can realize the miniaturization design.

In addition, the plurality of coils 4 are cured in the first valve cavity 5 of the eddy current driven valve by epoxy resin with low air permeability.

Preferably, the outlet 2 is a laval nozzle. By modifying the air outlet 2 into a Laval nozzle, the air flow speed of the air outlet 2 can reach 2000 m/s through calculation simulation and actual measurement. The working gas can reach the expected area more quickly on the one hand, and on the other hand, the quick working gas has stronger plasma penetration effect, and the gas supplementing efficiency is improved. In addition, an 1/4-inch air pipe joint can be used as the air inlet 15, and high-pressure working gas can flow into the vortex-actuated valve through the air inlet 15.

As shown in fig. 1, the first valve chamber 5 is located below the vortex driven valve and the second valve chamber 8 is located above the vortex driven valve.

As mentioned above, the coil 4 is disposed in the first valve chamber 5, the elastic restoring member 3 is disposed in the second valve chamber 8 because the elastic restoring member 3 is disposed in the opposite direction of the coil 4, and both ends of the elastic restoring member 3 abut against the valve disc 1 and the inner wall of the valve chamber, respectively.

Specifically, the first valve chamber 5 is formed between the lower cover 6 and the intermediate cover 7, and the second valve chamber 8 is formed between the upper cover 9 and the intermediate cover 7. Referring to fig. 1, the upper cover 9 and the lower cover 6 form an outer casing structure of the eddy current driven valve, and an intermediate cover 7 is further disposed between the upper cover 9 and the lower cover 6. The middle cover body 7 is fixedly connected with the upper cover body 9 and the lower cover body 6 through bolts.

Preferably, the upper cover 9, the lower cover 6 and the intermediate cover 7 are made of stainless steel material.

Further, the vortex driven valve also includes an insulating assembly.

The purpose of the insulating assembly is to insulate the coil 4 from the eddy current driven valve. Specifically, the insulating assembly includes a ceramic isolation layer 10 and a polyimide film 11, the ceramic isolation layer 10 is disposed between the coil assembly and the first valve chamber 5, and the ceramic isolation layer 10 can insulate the coil assembly from the first valve chamber 5. The polyimide film 11 is provided between the coil block and the intermediate cover 7, and the polyimide film 11 can function to insulate the coil block from the intermediate cover 7.

Further, seal rings 12 are provided between the upper cover 9 and the intermediate cover 7 and between the valve disk 1 and the intermediate cover 7.

The provision of the seal ring 12 can improve the sealing performance of the eddy current drive valve. Specifically, the seal ring 12 is provided between the upper lid body 9 and the intermediate lid body 7, and the seal ring 12 is made of a fluororubber ring.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. An eddy current driven valve is characterized by comprising a valve disc (1), a coil assembly and a power supply control unit,

the valve disc (1) is provided with a first working position for shielding the air outlet (2) and a second working position for opening the air outlet (2);

the coil assembly is arranged on one side, facing the air outlet (2), of the valve disc (1) to drive the valve disc (1) to move from the first working position to the second working position, and an elastic resetting piece (3) is arranged on one side, far away from the air outlet (2), of the valve disc (1);

the power supply control unit is electrically connected with the coil assembly and provides pulse current for the coil assembly;

the vortex driving valve comprises an upper cover body (9), a lower cover body (6) and an intermediate cover body (7) connected between the upper cover body (9) and the lower cover body (6), wherein the lower cover body (6) and the intermediate cover body (7) form a first valve cavity (5), and the upper cover body (9) and the intermediate cover body (7) form a second valve cavity (8).

2. The eddy current driven valve according to claim 1, wherein the coil assembly comprises a plurality of layers of coils (4), each layer of coils (4) being cured by a thermosetting low outgassing rate epoxy material, the plurality of layers of coils (4) being disposed within the first valve chamber (5).

3. The eddy current driven valve according to claim 2, characterised in that the coil (4) is formed by warp cutting of an electrically conductive material.

4. Vortex driven valve according to claim 1, characterised in that said outlet (2) is a laval nozzle.

5. The swirl actuated valve according to claim 1, wherein the elastic return member (3) is arranged in a second valve chamber (8), and both ends of the elastic return member (3) abut against the valve disc (1) and the inner wall of the valve chamber, respectively.

6. The vortex driven valve according to claim 1, further comprising an insulating assembly comprising a ceramic isolation layer (10) and a polyimide membrane (11), said ceramic isolation layer (10) being arranged between said coil assembly and said first valve chamber (5), said polyimide membrane (11) being arranged between said coil assembly and said intermediate cover (7).

7. The vortex driven valve according to claim 1, wherein sealing rings (12) are provided between said upper cover (9) and said intermediate cover (7) and between said valve disc (1) and said intermediate cover (7).

8. The eddy current driven valve according to any one of claims 1 to 7, wherein an alumina ceramic (13) is connected to the upper cover (9), a connecting wire (14) is provided in the alumina ceramic (13), and the coil assembly is electrically connected to the power supply control unit through the connecting wire (14).

9. The vortex driven valve according to any of claims 1-7, wherein said valve disc (1) is made of an electrically conductive material.