CN113669462B - Low-power-consumption bistable electromagnetic valve - Google Patents

Low-power-consumption bistable electromagnetic valve Download PDF

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Publication number
CN113669462B
CN113669462B CN202110952524.0A CN202110952524A CN113669462B CN 113669462 B CN113669462 B CN 113669462B CN 202110952524 A CN202110952524 A CN 202110952524A CN 113669462 B CN113669462 B CN 113669462B
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valve
coil
valve body
electromagnet
layer
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CN113669462A (en
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韩冬
卢方
郑哲
高超
刘毅
龚国芳
杨华勇
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0644—One-way valve
    • F16K31/0655—Lift valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/0675—Electromagnet aspects, e.g. electric supply therefor

Abstract

The invention discloses a bistable electromagnetic valve with low power consumption, which comprises a valve body, an inlet joint positioned at the inlet end of the valve body and an electromagnet assembly positioned at the outlet end of the valve body, wherein the electromagnet assembly is provided with a magnetic ring; the valve body is internally combined with an electromagnet assembly body through a fixed cylindrical magnet, an annular magnet and the electromagnet assembly body to form a bi-stable structure, the combination of a mechanical spring and an ejector rod is replaced by a magnetic spring, and the configuration of a single group of coils of a traditional electromagnetic valve is replaced by two groups (or multiple groups) of coils, so that the reliability of the electromagnetic valve is improved, the energy consumption and the size of the electromagnetic valve are reduced, and the voltage required by the work of the valve is effectively reduced. The invention has great adaptability and application potential in a tiny electronic system.

Description

Low-power-consumption bistable electromagnetic valve
Technical Field
The invention belongs to the field of electromagnetic valve equipment, and particularly relates to a bistable electromagnetic valve with low power consumption.
Background
The solenoid valve is widely used in various fluid control systems because of its simple structure and operation principle. The structure of a conventional solenoid valve is shown in fig. 1, and mainly comprises a valve body 61, a return spring 62, an electromagnetic coil 63, a plunger 64, a valve port 65, and an armature 66. When not electrified, the ejector rod of the electromagnetic valve pushes the conical valve port under the action of the spring force, so that the valve port is closed. When the valve is electrified, the magnetic force generated by the coil attracts the armature to move upwards against the spring force, so that the valve port is opened. The electromagnetic valve is kept in an open state by continuous energization until the electromagnetic suction force disappears when the power is off, and the push rod compresses the valve port again under the action of the spring force to close the valve.
The existing electromagnetic valve adopts a mechanical spring as a recovery mechanism, and if the valve is to be kept in an open state, a coil must be continuously electrified, so that an ejector rod can always compress the spring, and a valve port is unobstructed. However, mechanical springs present two major drawbacks. Firstly, as the opening times of the electromagnetic valve increase, the mechanical spring inevitably loses efficacy, which is mainly represented by the change of the spring stiffness, and the spring stiffness gradually decreases along with the increase of the expansion times, which leads to the reduction of the force of the mandril pressing the valve port, so that the valve port is sealed insecure. Secondly, energy consumption is large. The valve can be kept in an open state only by continuous electrification, the valve is longer in opening time and more obvious in energy consumption in many occasions, and the valve generates serious heating phenomenon due to serious copper loss caused by long-time electrification. In addition, the coil of the conventional solenoid valve usually adopts a single coil, and if the electromagnetic force is to be boosted, only the method of increasing the energizing voltage can be adopted, and in the case of a tiny electronic device, the voltage is limited (<5V), and once the voltage required by the valve exceeds the limit, a voltage boosting circuit must be introduced, which causes the volume of the whole system to be increased, and is not beneficial to the miniaturization of the tiny electronic device.
Disclosure of Invention
The invention solves the defects just by adopting a bistable structure based on a magnetic spring and changing the configuration of the traditional electromagnetic coil, and provides the bistable electromagnetic valve with low power consumption.
The technical scheme of the invention is as follows:
the invention provides a bistable electromagnetic valve with low power consumption, which comprises a valve body, an inlet joint positioned at the inlet end of the valve body and an electromagnet assembly positioned at the outlet end of the valve body, wherein the electromagnet assembly is provided with a magnetic core;
an air inlet is formed in the middle of the inlet connector, and a connecting ring is arranged at one end, facing the inner side of the valve body, of the inlet connector; the valve body is internally provided with a front cavity and an inner cavity which are separated by an overflowing layer; the overflow layer is provided with an overflow hole for communicating the front cavity with the inner cavity, the end surface of the connecting ring is abutted against the overflow layer, and the connecting ring does not block the overflow hole;
a fixed cylindrical magnet mounting hole is formed in the middle of the overflowing layer, and a fixed cylindrical magnet is arranged in the mounting hole; the inner cavity consists of a moving annular magnet moving cavity close to the overflowing layer and an electromagnet mounting cavity close to the outlet end;
the movable annular magnet is arranged in the movable annular magnet movement cavity, the movable annular magnet can move in the movable annular magnet movement cavity along the axial direction, and the movable annular magnet can completely block the overflowing hole when abutting against the overflowing layer; the electromagnet assembly body is arranged in the electromagnet installation cavity;
the electromagnet assembly body comprises an electromagnet end cover, a sealing end cover, a cylindrical iron core and a coil, wherein an air outlet hole is formed in the center of the cylindrical iron core; the cylindrical iron core is provided with a sealing cover positioning convex shoulder, the center of the electromagnet end cover is provided with a through hole which is arranged at one end of the cylindrical iron core facing the interior of the valve body, the sealing end cover is sleeved on the cylindrical iron core and is abutted against the sealing cover positioning convex shoulder of the cylindrical iron core, and the sealing end cover is connected with the valve body in a sealing way; the coil is wound on the cylindrical iron core and is positioned between the electromagnet end cover and the sealing end cover.
Further, the outer diameter of the connecting ring is matched with the inner diameter of the front cavity, and the inlet connector is hermetically arranged at the inlet end of the valve body through the connecting ring.
Furthermore, the valve body is provided with a rectangular slot near the outlet end, from which the wiring of the coil is passed out, and after final assembly, the hole is sealed.
Further, there are a plurality of flow holes, typically but not limited to, the number of flow holes may be selected to be 2, 3, 4, 5, 6, etc.; the overflowing holes are uniformly arranged along the circumferential direction of the overflowing layer.
Further, the shape of the overflowing hole can be fan-shaped, square, round and the like, as long as the overflowing hole can be blocked when being abutted by the movable ring-shaped magnet and can provide enough flow when the valve is opened, and the shape is preferably selected to be convenient to process.
Furthermore, the coil comprises a plurality of layers of coils, an outer layer coil is sleeved on the periphery of an inner layer coil, and an innermost layer coil is sleeved 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 materials. After the valve is opened, the moving assembly is stabilized by the attraction of the cylindrical iron core under the condition of power failure.
Compared with the prior art, the invention has the beneficial effects that:
the movable annular magnet can seal the valve port by blocking the overflowing hole under the attraction of the fixed cylindrical magnet, so that the valve is kept in a normally closed state. When the valve is electrified, under the attraction of the electromagnet assembly body, the annular magnet is moved to be away from the valve port and attached to the electromagnet end cover, the front cavity is communicated with the inner cavity, and the valve is opened. The structure is a bistable structure since the moving ring magnet can be held in a stable state in both the upper limit position (close to the stationary cylindrical magnet) and the lower limit position (close to the cylindrical core). Therefore, when the annular magnet is moved to attach the electromagnet assembly, even if power is cut off, the annular magnet stays on the electromagnet end cover under the attraction of the cylindrical iron core, so that the valve is still kept open. When the valve needs to be closed, only instantaneous reverse current needs to be applied to the electromagnet assembly body, at the moment, the movable annular magnet is repelled and returns to the initial position to block the overflowing hole, after the movable annular magnet returns to the initial position, the movable annular magnet is in another stable state, namely, even if the electromagnet is powered off under the attraction of the fixed cylindrical magnet, the movable annular magnet can be stopped at the initial position, and the valve is closed again. Therefore, the valve can be opened and closed for a long time only by supplying power instantaneously (dozens of milliseconds), and the power consumption is extremely low. Further, the magnetic spring has a variable stiffness characteristic compared to the mechanical spring, that is, the closer the ring magnet is to the cylindrical magnet, the greater the equivalent stiffness therebetween, and when the distance between the ring magnet and the cylindrical magnet is 0, the stiffness thereof is much greater than that of the mechanical spring, so that failure is not likely to occur. In addition, the invention adopts the parallel double-group coil to replace the single-group coil configuration of the traditional electromagnetic valve, thereby effectively reducing the energizing voltage required by the valve, and greatly improving the adaptability of the small electromagnetic valve in a tiny electronic system.
Aiming at the problems of low reliability, high energy consumption and poor adaptability in small electronic equipment of the traditional electromagnetic valve, the invention combines a fixed cylindrical magnet, a movable annular magnet and an electromagnet assembly body to form a bi-stable structure, replaces the combination of a mechanical spring and an ejector rod by a magnetic spring, and replaces the configuration of a single group of coils of the traditional electromagnetic valve by two groups (or multiple groups) of coils, thereby not only improving the reliability of the electromagnetic valve, reducing the energy consumption and the size of the electromagnetic valve, but also effectively reducing the voltage required by the work of the valve. The invention has great adaptability and application potential in a tiny electronic system.
Drawings
FIG. 1 is a schematic structural diagram of a conventional solenoid valve;
FIG. 2 is an external view of a bistable solenoid valve with low power consumption according to the present invention;
FIG. 3 is an exploded view of the solenoid valve of the present invention;
FIG. 4 is a block diagram of an inlet fitting of the present invention;
FIG. 5 is a sectional view of the valve body of the present invention;
FIG. 6 is an exploded view of the electromagnet assembly of the present invention;
FIG. 7 is a single set coil and double set coil energization diagram;
fig. 8 is a working principle diagram of the present invention.
In the figure, 1-inlet connector, 2-valve body, 3-electromagnet assembly body, 4-fixed cylindrical magnet, 5-movable annular magnet, 11-connecting ring, 21-overflowing layer 211-overflowing hole, 212-fixed cylindrical magnet mounting hole, 22-movable annular magnet moving cavity, 23-electromagnet mounting cavity, 24-rectangular groove, 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-restoring spring, 63-electromagnetic coil, 64-ejector rod, 65-valve port and 66-armature.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
As shown in fig. 2 and 3, the bistable solenoid valve with low power consumption proposed in this embodiment mainly comprises 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 fig. 4 and 5, an air inlet is arranged in the middle of the inlet joint 1, and a connecting ring 11 is arranged at one end of the inlet joint facing the inner side of the valve body; the valve body is internally provided with a front cavity and an inner cavity which are separated by a flow-through layer 21; the overflowing layer 21 is provided with an overflowing hole 211 for communicating the front cavity with the inner cavity, the end surface of the connecting ring 11 is abutted against the overflowing layer 21, the diameter of the inner ring of the connecting ring 11 is larger, the space wrapped by the inner ring of the connecting ring forms the front cavity, and the overflowing hole is not blocked because the diameter of the inner ring of the connecting ring 11 is larger; a fixed cylindrical magnet mounting hole 212 is formed in the middle of the overflowing layer 21, and a fixed cylindrical magnet 4 is arranged in the mounting hole; the inner cavity consists of a moving annular magnet moving cavity 22 close to the overflowing layer 21 and an electromagnet mounting 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, the moving ring magnet 5 is hollow in the middle and can move axially in the moving ring magnet moving cavity, and when the moving ring magnet 5 abuts against the overflowing layer 21, the overflowing hole 211 can be completely blocked; the electromagnet assembly body 3 is arranged in the electromagnet installation cavity 23;
as shown in fig. 6, the electromagnet assembly 3 includes an electromagnet end cover 31, a sealing end cover 35, a cylindrical iron core 34, and a coil, wherein an air outlet is formed in the center of the cylindrical iron core; the cylindrical iron core is provided with a sealing cover positioning convex shoulder 341, the center of the electromagnet end cover 31 is provided with a through hole which is arranged at one end of the cylindrical iron core facing the interior of the valve body, the sealing end cover 35 is sleeved on the cylindrical iron core and is abutted against the sealing cover positioning convex shoulder of the cylindrical iron core, and the sealing end cover is connected with the valve body in a sealing way; the coil is wound on the cylindrical iron core and is positioned between the electromagnet end cover and the sealing end cover.
In one embodiment of the invention, the outer diameter of the coupling ring, through which the inlet fitting is sealingly mounted at the inlet end of the valve body, matches the inner diameter of the forward cavity.
In one embodiment of the invention, the valve body is provided with a rectangular slot 24 near the outlet end through which the coil connections are passed, and the hole is sealed after final assembly.
In one embodiment of the invention, the overflow holes are arranged uniformly in the circumferential direction of the overflow layer 21. The overflowing holes are fan-shaped overflowing holes, and the number of the overflowing holes is 4.
The coil comprises a plurality of layers of coils, an outer layer coil is sleeved on the periphery of an inner layer coil, and an innermost layer coil is sleeved on the cylindrical iron core; the coils of each layer are connected in parallel. In one embodiment of the invention, the coil comprises 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 electromagnetic valve, the double-set coil configuration adopted by the invention can effectively reduce the working voltage of the valve under the condition of not weakening the performance of the valve. Fig. 7(a) shows a coil energization diagram of a conventional solenoid valve, and assuming that a power supply is a constant voltage source with a voltage U, according to the theory of electromagnetism, the expression of the magnetic field strength H of a magnetic field generated by a direct current coil is as follows:
Figure BDA0003218979100000051
in the formula, N is the number of turns of the electrified coil;
i is the current of the electrified coil and 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 current coil is proportional to the ampere-turns N · I. FIG. 7(b) is a diagram of the energization of the dual set of coils proposed by the present invention, the power supply for the dual set of coils is also U, and the total number of turns N of the dual set of coils is compared to the single set of coils in FIG. 7(a)2(inner coil turns NInner partNumber of turns N of outer coilOuter coverSum) and the number of turns N of a single set of coils1The same is true. I.e. N1＝N2＝NInner part+NOuter coverAnd N isInner part＝NOuter cover. If the single-group coil and the double-group coil adopt copper wires with the same resistivity, the single-group coilResistance R of1Equal to the sum of the resistances of the inner and outer coils of the double coil, i.e. R1＝R2＝RInner part+ROuter coverAnd R isInner part＝ROuter coverThen R is1＝R2＝2RInner part＝2ROuter cover. Thus, by current I in a single set of coils1Comprises the following steps:
Figure BDA0003218979100000061
the current through the inner and outer coils of the double coil set is:
Figure BDA0003218979100000062
the following equations can be obtained by combining the following formulas: I.C. A1＝0.5IInner part＝0.5IOuter cover
Therefore, under the same voltage, the magnetic field intensity H of the magnetic field generated by the parallel connection of the two groups of coils2＝2H1. Conversely, under the condition of generating the magnetic field with the same magnetic field intensity, the energizing voltage of the double-group coil is only half of the energizing voltage of the single-group coil. Because button cells are generally used as power sources in small electronic devices, the voltage is small (<5V), if a higher voltage is used, a booster circuit is generally needed, and the addition of the booster circuit increases the volume of the whole system. The electromagnetic valve adopting the double groups of coils can perfectly solve the problem, and the required voltage can be reduced by half only by changing the coil configuration of the traditional electromagnetic valve.
It should be noted that there may be more sets of coils of the electromagnet, such as 3 sets of coils and multiple sets of coils, the voltage will further decrease, but as the voltage decreases, the total current will continuously increase, and considering the current density limit of the copper wire, the number of sets of coils cannot be infinitely increased.
The operation principle diagram of the electromagnetic valve of the invention is shown in fig. 8, when the valve is in a non-operation state (the coil is not electrified), the moving annular magnet 5 is attracted by the fixed cylindrical magnet 4 and approaches to the fixed cylindrical magnet, so that a fan-shaped overflowing hole in the valve body is blocked, the air flow passage is blocked, and the valve is in a normally closed state (fig. 8 a). When the valve is in the working state (the coil is electrified), the electromagnet generates stronger attraction force to force the movable annular magnet to be far away from the fixed cylindrical magnet, so that the fan-shaped overflowing hole is opened. After leaving the fixed cylindrical magnet for a certain distance, the moving ring magnet enters the potential well of the electromagnet assembly 3 and is quickly attached to the electromagnet end cover 31, and at this time, the valve can also be kept in the maximum opening state without being electrified again (fig. 8 b). (because of the distance, the attraction force of the cylindrical iron core on the movable assembly is greater than that from the fixed annular magnet), after the airflow enters the inner cavity of the valve body through the fan-shaped overflowing hole, the airflow flows out of the outlet through the inner hole of the movable annular magnet, the middle through hole of the electromagnet end cover and the cylindrical iron core 34. When the valve needs to be closed, only the coil needs to be electrified with reverse current, the movable annular magnet 5 moves towards the fixed cylindrical magnet 4 under the repulsive force from the electromagnet assembly until the fan-shaped overflowing hole is blocked again, at the moment, the valve is powered off, and the movable annular magnet can also firmly block the valve port (the fan-shaped air vent) by the attraction force of the fixed cylindrical magnet alone, so that the valve returns to the normally closed state (fig. 8 c).
The invention can prolong the service life of the electromagnetic valve, reduce energy consumption and reduce the volume of the electromagnetic valve to the maximum extent. The fluid control system has a very wide application prospect in small fluid control systems with large space size limitation. The adoption of the two groups of coils connected in parallel effectively reduces the energizing voltage required by the valve, which improves the adaptability of the small-sized solenoid valve in a tiny electronic system.
The electromagnet of the invention uses the nonlinear magnetic spring to replace the mechanical spring of the traditional electromagnetic valve, applies the magnetic bistable structure in the electromagnetic valve, can realize the long-time opening and closing of the valve only by giving instantaneous current signals, and greatly reduces the energy consumption of the electromagnetic valve and the heating of the electrified coil. The invention utilizes the double-group coils connected in parallel to replace the single-group coils of the traditional electromagnetic valve, can effectively reduce the energizing voltage required by the valve, and greatly expands the application of the small electromagnetic valve in a tiny electronic system.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (6)

1. A bistable electromagnetic valve with low power consumption is characterized by comprising a valve body, an inlet joint positioned at the inlet end of the valve body and an electromagnet assembly positioned at the outlet end of the valve body;
an air inlet is formed in the middle of the inlet connector, and a connecting ring is arranged at one end, facing the inner side of the valve body, of the inlet connector; the valve body is internally provided with a front cavity and an inner cavity which are separated by an overflowing layer; the overflow layer is provided with an overflow hole for communicating the front cavity with the inner cavity, the end surface of the connecting ring is abutted against the overflow layer, and the connecting ring does not block the overflow hole;
a fixed cylindrical magnet mounting hole is formed in the middle of the overflowing layer, and a fixed cylindrical magnet is arranged in the mounting hole; the inner cavity consists of a moving annular magnet moving cavity close to the overflowing layer and an electromagnet mounting cavity close to the outlet end;
the movable annular magnet is arranged in the movable annular magnet movement cavity, the movable annular magnet can move in the movable annular magnet movement cavity along the axial direction, and the overflowing hole can be completely blocked when the movable annular magnet abuts against the overflowing layer; the electromagnet assembly body is arranged in the electromagnet installation cavity;
the electromagnet assembly body comprises an electromagnet end cover, a sealing end cover, a cylindrical iron core and a coil, wherein an air outlet hole is formed in the center of the cylindrical iron core; the cylindrical iron core is provided with a sealing cover positioning convex shoulder, the center of the electromagnet end cover is provided with a through hole which is arranged at one end of the cylindrical iron core facing the interior of the valve body, the sealing end cover is sleeved on the cylindrical iron core and is abutted against the sealing cover positioning convex shoulder of the cylindrical iron core, and the sealing end cover is connected with the valve body in a sealing way; the coil is wound on the cylindrical iron core and is positioned between the electromagnet end cover and the sealing end cover; the coil consists of a plurality of layers of coils, the outer layer of coil is sleeved on the periphery of the inner layer of coil, and the innermost layer of coil is sleeved on the cylindrical iron core; the coils of each layer are connected in parallel.
2. The bistable solenoid valve with low power consumption of claim 1, wherein the outside diameter of the connecting ring is matched with the inside diameter of the front cavity, and the inlet joint is hermetically installed at the inlet end of the valve body through the connecting ring.
3. The bistable solenoid valve of claim 1, wherein said valve body has a rectangular slot near the outlet end through which the coil wire passes, and the rectangular slot is sealed after final assembly.
4. The bistable solenoid valve with low power consumption of claim 1, wherein said overflow hole is multiple and is uniformly arranged along the circumference of overflow layer.
5. The bistable solenoid valve with low power consumption of claim 4, wherein said flow hole is a fan-shaped flow hole.
6. The bistable electromagnetic valve with low power consumption as claimed in claim 1, wherein said electromagnet end cap is made of non-magnetic material.
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