WO2023019491A1

WO2023019491A1 - Low power consumption bistable solenoid valve

Info

Publication number: WO2023019491A1
Application number: PCT/CN2021/113391
Authority: WO
Inventors: 韩冬; 卢方; 郑哲; 高超; 刘毅; 龚国芳; 杨华勇
Original assignee: 浙江大学
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2023-02-23

Abstract

A low power consumption bistable solenoid valve, comprising a valve body (2), an inlet connector (1) that is located at an inlet end of the valve body (2), and an electromagnet assembly (3) that is located at an outlet end of the valve body (2). The interior of the valve body (2) forms a bistable structure by means of the combination of a fixed cylindrical magnet (4), a ring-shaped magnet (5) and the electromagnet assembly (3). A magnetic spring is used to replace a combination of a mechanical spring and an ejector rod, and double (or multiple) coils are used to replace single coil configurations of conventional solenoid valves, thereby not only improving the reliability of a solenoid valve and reducing the energy consumption and size of the solenoid valve, but also effectively reducing the voltage required for operation of the valve. In micro electronic systems, the described bistable solenoid valve has great adaptability and application potential.

Description

A Low Power Consumption Bistable Solenoid Valve

technical field

The invention belongs to the field of electromagnetic valve equipment, and in particular relates to a bistable electromagnetic valve with low power consumption.

Background technique

Solenoid valve is widely used in various fluid control systems because of its simple structure and working principle. The structure of a conventional solenoid valve is shown in FIG. 1 , which mainly includes a valve body 61 , a return spring 62 , an electromagnetic coil 63 , a push rod 64 , a valve port 65 and an armature 66 . When not electrified, the ejector rod of the solenoid valve pushes against the conical valve port under the action of the spring force, so that the valve port is closed. When energized, the magnetic force generated by the coil attracts the armature to move upward against the spring force, and the valve port is opened. Continue to energize the solenoid valve to keep the solenoid valve open until the electromagnetic suction disappears when the power is turned off, and the ejector pin presses the valve port again under the action of the spring force to close the valve.

Existing solenoid valves use a mechanical spring as a recovery mechanism. To keep the valve open, the coil must be continuously energized so that the ejector rod can always press the spring, so that the valve port is unobstructed. However, mechanical springs introduce two major drawbacks. First, with the increase of the opening times of the solenoid valve, the mechanical spring will inevitably fail. The force is reduced, so that the valve port seal is not firm. Second, the energy consumption is large. Only continuous power-on can keep the valve open. In many cases, the valve is opened for a long time, and the disadvantage of energy consumption is more obvious. Moreover, long-term power-on will cause serious copper loss and cause serious heat generation in the valve. In addition, the coils of traditional solenoid valves usually use a single set of coils. If you want to increase the electromagnetic force, you can only use the method of increasing the energized voltage. In tiny electronic devices, the voltage is limited (<5V). Once the required voltage exceeds this limit, a booster circuit must be introduced, which will increase the size of the entire system, which is not conducive to the miniaturization of tiny electronic devices.

Contents of the invention

The present invention just solves the above defects by adopting a bistable structure based on a magnetic spring and changing the configuration of a traditional electromagnetic coil, and provides a low power consumption bistable solenoid valve.

Technical scheme of the present invention is as follows:

The invention provides a bistable electromagnetic valve with low power consumption, which includes a valve body, an inlet joint located at the inlet end of the valve body, and an electromagnet assembly located at the outlet end of the valve body;

The middle part of the inlet joint is provided with an air inlet, and the end of the inlet joint facing the inside of the valve body is provided with a connecting ring; the valve body has a front cavity and an inner cavity, and the front cavity and the inner cavity are separated by a flow layer; There is an overflow hole connecting the front cavity and the inner cavity on the layer, and the end surface of the connecting ring is in contact with the overflow layer, and the connecting ring does not block the overflow hole;

There is a fixed cylindrical magnet installation hole in the middle of the flow layer, and a fixed cylindrical magnet is arranged in the installation hole; the inner cavity is composed of a moving ring magnet movement cavity close to the flow layer and an electromagnet installation cavity close to the outlet;

The moving ring magnet is provided with a moving ring magnet in the moving cavity. The moving ring magnet can move axially in the moving ring magnet moving cavity. When the moving ring magnet is against the flow layer, it can completely block the flow hole; the electromagnet The assembly is installed in the electromagnet installation cavity;

The electromagnet assembly includes an electromagnet end cover, a sealing end cover, a cylindrical iron core and a coil, wherein the center of the cylindrical iron core is provided with an air outlet; the cylindrical iron core is provided with a sealing cover positioning protrusion There is a through hole in the center of the electromagnet end cover, which is installed on the end of the cylindrical iron core facing the inside of the valve body. The sealing end cover is sleeved on the cylindrical iron core, and it abuts against the cylindrical iron core. The sealing cover is located at the shoulder, and the sealing end cover is sealed with the valve body; the coil is wound on the cylindrical iron core, and it is located between the electromagnet end cover and the sealing end cover.

Further, the outer diameter of the connecting ring matches the inner diameter of the front cavity, and the inlet joint is sealed and installed at the inlet end of the valve body through the connecting ring.

Further, the valve body is provided with a rectangular groove near the outlet end, through which the wiring of the coil passes, and after the final assembly is completed, the hole is sealed.

Further, there are multiple flow holes, which are typical but not limited. The number of flow holes can be selected as 2, 3, 4, 5, 6, etc.; The flow layer is evenly distributed in the circumferential direction.

Further, the shape of the flow hole can be fan-shaped, square, circular, etc., as long as the flow hole can be blocked by the moving ring magnet and can provide sufficient flow when the valve is opened. The shape selection is preferably a shape that is easy to process.

Further, the coil is composed of multi-layer coils, the outer coil is sheathed on the periphery of the inner coil, and the innermost coil is sheathed on the cylindrical iron core; the coils of each layer are connected in parallel.

Further, the electromagnet end cover is made of non-magnetic conductive material. After the valve is opened, the moving assembly is stabilized by the attractive force of the cylindrical iron core under the condition of power failure.

Compared with the prior art, the beneficial effects of the present invention include:

Under the attraction of the fixed cylindrical magnet, the moving ring magnet of the present invention can seal the valve port by blocking the flow hole, so that the valve can be kept in a normally closed state. When the valve is energized, under the attraction of the electromagnet assembly, the moving ring magnet is away from the valve port and attached to the end cover of the electromagnet, the front cavity and the inner cavity are connected, and the valve is opened. Since the moving ring magnet can maintain a stable state at the upper limit position (close to the fixed cylindrical magnet) and the lower limit position (close to the cylindrical iron core), the structure is a bistable structure. Therefore, even if the power is cut off when the moving ring magnet sticks to the electromagnet assembly, it will stay on the end cover of the electromagnet under the attraction of the cylindrical iron core to keep the valve open. When the valve needs to be closed, it is only necessary to apply an instantaneous reverse current to the electromagnet assembly. At this time, the moving ring magnet is repelled and returns to the initial position to block the flow hole. After returning to the initial position, the moving ring magnet is in another position. A steady state, that is, under the attraction of the fixed cylindrical magnet, even if the electromagnet is de-energized, the moving ring magnet can stop at the initial position, so that the valve can be closed again. Therefore, the present invention only needs instantaneous (tens of milliseconds) power supply to realize long-term opening and closing of the valve, and the power consumption is extremely low. Moreover, compared with the mechanical spring, the magnetic spring has the characteristic of variable stiffness, that is, the closer the ring magnet is to the cylindrical magnet, the greater the equivalent stiffness between them, and when the distance between the two is 0, its stiffness is much greater than that of the mechanical spring, so Not prone to failure. In addition, the present invention replaces the single-set coil configuration of the traditional solenoid valve with parallel double-set coils, effectively reducing the energizing voltage required by the valve, which greatly improves the adaptability of the small solenoid valve in tiny electronic systems.

Aiming at the problems of low reliability, high energy consumption and poor adaptability in tiny electronic devices of the traditional solenoid valve, the present invention combines a fixed cylindrical magnet, a moving ring magnet and an electromagnet assembly to form a bistable structure, and replaces it with a magnetic spring The combination of mechanical spring and ejector rod is replaced by double (or multiple) coils instead of the single coil configuration of the traditional solenoid valve, which not only improves the reliability of the solenoid valve, reduces the energy consumption and size of the solenoid valve, but also effectively The voltage required for valve operation is reduced. In tiny electronic systems, the invention has great adaptability and application potential.

Description of drawings

Figure 1 is a schematic structural diagram of a traditional solenoid valve;

Fig. 2 is the exterior view of the bistable electromagnetic valve of low power consumption of the present invention;

Fig. 3 is the explosion diagram of electromagnetic valve of the present invention;

Fig. 4 is a structural diagram of the inlet joint of the present invention;

Fig. 5 is a valve body structure and a sectional view of the present invention;

Fig. 6 is an exploded view of the electromagnet assembly of the present invention;

Fig. 7 is the energization diagram of a single group of coils and a double group of coils;

Fig. 8 is a working principle diagram of the present invention.

In the figure, 1-inlet connector, 2-valve body, 3-electromagnet assembly, 4-fixed cylindrical magnet, 5-moving ring magnet, 11-connecting ring, 21-flowing layer, 211-flowing hole, 212- Mounting hole for fixed cylindrical magnet, 22-moving ring magnet movement chamber, 23-electromagnet installation chamber, 24-rectangular slot, 31-electromagnet end cover, 32-outer coil, 33-inner coil, 34-cylindrical Iron core, 35-sealing end cover, 341-sealing cover positioning shoulder, 61 valve body, 62-recovery spring, 63-electromagnetic coil, 64-ejector rod, 65-valve port, 66-armature.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

As shown in Figures 2 and 3, the low power consumption bistable solenoid valve proposed in this embodiment mainly includes a valve body 2, an inlet joint 1 at the inlet end of the valve body and an electromagnet assembly 3 at the outlet end of the valve body.

As shown in Figures 4 and 5, an air inlet is provided in the middle of the inlet joint 1, and a connecting ring 11 is provided at the end of the inlet joint toward the inside of the valve body; the valve body has a front cavity and an inner cavity, and the front cavity and the inner cavity Separated by the flow layer 21; wherein the flow layer 21 is provided with a flow hole 211 connecting the front cavity and the inner cavity, the end face of the connecting ring 11 is in contact with the flow layer 21, and the inner ring diameter of the connecting ring 11 is smaller Large, the space wrapped by the inner ring of the connecting ring constitutes the front cavity, because the diameter of the inner ring of the connecting ring 11 is relatively large, it does not block the flow hole; the middle part of the flow layer 21 is provided with a fixed cylindrical magnet mounting hole 212, and the installation A fixed cylindrical magnet 4 is arranged in the hole; the inner cavity is composed of a moving ring magnet movement cavity 22 close to the flow layer 21 and an electromagnet installation cavity 23 close to the outlet end;

As shown in Fig. 5, a moving ring magnet 5 is arranged in the moving ring magnet moving cavity 22, and the middle part of the moving ring magnet 5 is hollow, and it can move axially in the moving ring magnet moving cavity, and the moving ring magnet 5 abuts against the When the flow layer 21, the flow hole 211 can be completely blocked; the electromagnet assembly 3 is installed in the electromagnet installation cavity 23;

As shown in Figure 6, described electromagnet assembly 3 comprises electromagnet end cover 31, sealing end cover 35, cylindrical iron core 34 and coil, wherein, the center of cylindrical iron core is provided with air outlet; The iron core is provided with a sealing cover positioning shoulder 341, and the center of the electromagnet end cover 31 is provided with a through hole, which is installed on the end of the cylindrical iron core facing the inside of the valve body, and the sealing end cover 35 is sleeved on the cylindrical iron. core, and it abuts against the positioning shoulder of the sealing cover of the cylindrical iron core, and the sealing end cover is sealed with the valve body; the coil is wound on the cylindrical iron core, and it is located between the electromagnet end cover and the sealing end between covers.

In a specific embodiment of the present invention, the outer diameter of the connecting ring matches the inner diameter of the front cavity, and the inlet joint is sealed and installed at the inlet end of the valve body through the connecting ring.

In a specific embodiment of the present invention, the valve body is provided with a rectangular groove 24 near the outlet end, through which the wiring of the coil passes, and after the final assembly is completed, the hole is sealed.

In a specific embodiment of the present invention, the flow holes are evenly arranged along the circumference of the flow layer 21 . The flow holes are fan-shaped flow holes, and there are four in total.

The coil consists of multi-layer coils, the outer coil is sheathed on the periphery of the inner coil, and the innermost coil is sheathed on the cylindrical iron core; the coils of each layer are connected in parallel. In a specific embodiment of the present invention, the coil includes an outer coil and an inner coil, and the inner coil is sleeved between the outer coil and the cylindrical iron core; the outer coil and the inner coil are connected in parallel.

Compared with the single-set coil configuration of the traditional solenoid valve, the double-set coil configuration adopted by the present invention can effectively reduce the operating voltage of the valve without weakening the valve performance. The coil energization diagram of a traditional solenoid valve is shown in Figure 7(a). Assuming that the power supply is a constant voltage source, its voltage is U. According to the theory of electromagnetism, the expression of the magnetic field strength H of the magnetic field generated by the DC energized coil is as follows:

In the formula, N is the number of turns of the electrified coil;

I is the current of the energized coil, the unit is A;

Le is the effective magnetic path length of the test sample, in m.

Therefore, the magnetic field strength H of the DC energized coil is proportional to the ampere-turn number N·I. Fig. 7 (b) is the energization diagram of the double-set coil proposed by the present invention. Compared with the single-set coil in Fig. 7 (a), the power supply of the double-set coil is also U, and the total number of turns of the double-set coil is N ₂ (The sum of the number of turns N _of the inner coil and the number of turns N _of the outer coil) is the same as the number of turns _N1 of the single coil. That is, N ₁ =N ₂ =N _inner +N _outer , and N _inner =N _outer . If the copper wire with the same resistivity is used for the single-group coil and the double-group coil, the resistance R ₁ of the single-group coil is equal to the sum of the resistances of the inner and outer coils of the double-group coil, that is, R ₁ =R ₂ =R _inside +R _outside, and R _Inner = R _outer, then R ₁ =R ₂ =2R _inner =2R _outer . Therefore, the current I through a single set of coils _is :

The current passing through the inner and outer coils of the double coil is:

Combining the above formulas, we can get: I ₁ = 0.5I _inside = 0.5I _outside

Therefore, under the same voltage, the two sets of coils connected in parallel generate a magnetic field strength of H ₂ =2H ₁ . Conversely, under the condition of producing the same magnetic field strength, the energizing voltage of the double coil is only half of the energizing voltage of the single coil. Because in small electronic devices, button batteries are usually used as the power supply, and its voltage is small (<5V). If you want to use a higher voltage, you usually need to use a booster circuit, and adding a booster circuit will increase the size of the entire system. . The solenoid valve using double sets of coils proposed by the present invention can perfectly solve this problem, and the required voltage can be reduced by half only by changing the coil configuration of the traditional solenoid valve.

It should be noted that the electromagnet coil can also have more sets, such as 3 sets of coils and multiple sets of coils, the voltage will be further reduced, but as the voltage decreases, the total current will continue to increase, considering the copper wire The current density is limited, and the number of coil groups cannot be increased indefinitely.

The working principle diagram of the solenoid valve of the present invention is shown in Figure 8. When the valve is in a non-working state (the coil is not energized), the moving ring magnet 5 is attracted by the fixed cylindrical magnet 4 and approaches it, thereby blocking the valve in the valve body. The fan-shaped flow hole of the valve causes the airflow channel to be blocked and the valve is in a normally closed state (Figure 8a). When the valve is in the working state (the coil is energized), the electromagnet generates a stronger attractive force to force the moving ring magnet away from the fixed cylindrical magnet, so that the fan-shaped flow hole is opened. After moving the ring magnet away from the fixed cylindrical magnet for a certain distance, it will enter the potential well of the electromagnet assembly 3 and quickly stick to the end cover 31 of the electromagnet. At this time, the valve can maintain the maximum open state without power on again (Fig. 8b). (Because of the distance, the attraction of the moving component by the cylindrical iron core is greater than the attraction from the fixed ring magnet). The middle through hole of the iron end cap and the cylindrical iron core 34 flow out from the outlet. When the valve needs to be closed, it is only necessary to feed the reverse current to the coil, and the moving ring magnet 5 will receive the repulsive force from the electromagnet assembly and move towards the fixed cylindrical magnet 4 until the fan-shaped flow hole is blocked again, at this time the valve is closed. Electricity, the moving ring magnet can also firmly block the valve port (fan-shaped vent hole) by the attraction force of the fixed cylindrical magnet alone, so that the valve returns to the normally closed state (Fig. 8c).

The invention can improve the service life of the solenoid valve, reduce energy consumption and minimize the volume of the solenoid valve. It has great application prospects in small fluid control systems with large space constraints. The use of parallel double sets of coils effectively reduces the energization voltage required by the valve, which will improve the adaptability of small solenoid valves in tiny electronic systems.

The electromagnet of the present invention replaces the mechanical spring of the traditional solenoid valve with a non-linear magnetic spring, and applies a magnetic bistable structure to the solenoid valve. It only needs to give an instantaneous current signal to realize the long-term opening and closing of the valve, which greatly reduces the The energy consumption of the solenoid valve and the heating of the energized coil are reduced. The invention replaces the single coil of the traditional electromagnetic valve with parallel double coils, which can effectively reduce the energizing voltage required by the valve, which will greatly expand the application of the small electromagnetic valve in the micro electronic system.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

A bistable electromagnetic valve with low power consumption is characterized in that it includes a valve body, an inlet joint located at the inlet end of the valve body, and an electromagnet assembly located at the outlet end of the valve body;

The middle part of the inlet joint is provided with an air inlet, and the end of the inlet joint facing the inside of the valve body is provided with a connecting ring; the valve body has a front cavity and an inner cavity, and the front cavity and the inner cavity are separated by a flow layer; There is an overflow hole connecting the front cavity and the inner cavity on the layer, and the end surface of the connecting ring is in contact with the overflow layer, and the connecting ring does not block the overflow hole;

There is a fixed cylindrical magnet installation hole in the middle of the flow layer, and a fixed cylindrical magnet is arranged in the installation hole; the inner cavity is composed of a moving ring magnet movement cavity close to the flow layer and an electromagnet installation cavity close to the outlet;

The moving ring magnet is provided with a moving ring magnet in the moving cavity. The moving ring magnet can move axially in the moving ring magnet moving cavity. When the moving ring magnet is against the flow layer, it can completely block the flow hole; the electromagnet The assembly is installed in the electromagnet installation cavity;

The electromagnet assembly includes an electromagnet end cover, a sealing end cover, a cylindrical iron core and a coil, wherein the center of the cylindrical iron core is provided with an air outlet; the cylindrical iron core is provided with a sealing cover positioning protrusion There is a through hole in the center of the electromagnet end cover, which is installed on the end of the cylindrical iron core facing the inside of the valve body. The sealing end cover is sleeved on the cylindrical iron core, and it abuts against the cylindrical iron core. The sealing cover is located at the shoulder, and the sealing end cover is sealed with the valve body; the coil is wound on the cylindrical iron core, and it is located between the electromagnet end cover and the sealing end cover.
The bistable solenoid valve with low power consumption according to claim 1, characterized in that the outer diameter of the connecting ring matches the inner diameter of the front cavity, and the inlet joint is sealed and installed at the inlet end of the valve body through the connecting ring.
The bistable electromagnetic valve with low power consumption according to claim 1 is characterized in that, the valve body is provided with a rectangular groove near the outlet end, and the wiring of the coil passes through it, and after the final assembly is completed, the hole is Sealed.
The bistable solenoid valve with low power consumption according to claim 1, characterized in that there are a plurality of flow holes, which are evenly arranged along the circumference of the flow layer.
The bistable solenoid valve with low power consumption according to claim 4, characterized in that the flow hole is a fan-shaped flow hole.
According to claim 1, the bistable solenoid valve with low power consumption is characterized in that, the coil is composed of multi-layer coils, the outer coil is sleeved on the periphery of the inner coil, and the innermost coil is sleeved on a cylindrical coil. On the iron core; the coils of each layer are connected in parallel.
The bistable solenoid valve with low power consumption according to claim 1, wherein the electromagnet end cover adopts non-magnetic material.