Solenoid valve

Abstract

Solenoid valve comprising: a valve body (20) with a first passage (22) and a second passage (24) separated from the first passage; a coil body (30) comprising a main area (32), a connecting area (34) extending from the main area, and a mounting area (36) extending from an end of the connecting area remote from the main area, wherein an axial through-hole (37) passes through the main area, the connecting area, and the mounting area of ​​the coil body, and wherein the mounting area of ​​the coil body is connected to the valve body; a coil (40) wound around the main area of ​​the coil body; a stator (50) with a third passage (52); a plunger (60) movably arranged in the through-hole (37) of the coil body (30), wherein the plunger can move between an initial state and an operating state;a magnetic flux return device (70) attached to the connection area (34) of the coil body (30); and a spring (69) arranged between the stator (50) and the plunger (60) to move the plunger from the working state to the initial state; wherein, when the coil (40) is energized, the plunger (60) moves into the working state by magnetic attraction between the stator and the plunger, in which the plunger rests against the stator and closes the third passage (52) of the stator, and in which the first and second passages (22, 24) of the valve body (22) are connected to each other via the through-hole (37) in the coil body (30);and wherein, when the coil (40) is de-energized, the plunger (60) moves under the pressure of the spring into its initial state, in which the plunger closes the first passage (22) of the valve body, and in which the second passage (24) of the valve body and the third passage (52) of the stator are in communication with each other, characterized in that the stator (50) is movably mounted at one end of the through-opening (37) of the coil body (30) and that an elastic seal (100) is arranged between the stator (50) and the magnetic flux return device (70) such that the stator can deviate axially.

Description

AREA OF INVENTION

[0001] The invention relates to a solenoid valve and in particular a low-noise solenoid valve. BACKGROUND OF THE INVENTION

[0002] The use of solenoid valves in medical devices, such as massage machines, is widespread. U.S. Patent No. 5,992,461 describes a common solenoid valve consisting of a valve body and an electromagnetic body. The valve body has two ports. The electromagnetic body has a U-shaped magnetically conductive element, a coil former defining an inner opening, a coil wound around the coil former, a stator located at one end of the coil former, and a hollow plunger located at the other end of the coil former. The stator has a third port. The plunger contains a pair of plugs and an inner spring between the plugs. An outer spring is located between the plunger and the stator.When the coil is energized, the plunger is magnetized and attracted to the stator, causing the stopper at the end of the plunger to close the third port of the stator, and the two ports of the valve body communicate with each other. When the coil is de-energized, the plunger is returned to its initial position by the restoring force of the external spring, closing the first port of the valve body, and the second port of the valve body communicates with the third port of the stator.

[0003] In the solenoid valve described above, the stator and the U-shaped conductive element are in rigid contact with each other. When the plunger moves towards the stator under the influence of the magnetic force, the contact between the two components results in a violent impact, generating vibrations and noise. These vibrations are rapidly transmitted to the coil former and the U-shaped magnetically conductive element, producing a high noise level. This noise can be extremely disturbing for users and patients. OVERVIEW

[0004] For this reason, a solenoid valve that produces less noise is desired.

[0005] According to the invention, this is achieved by using a floating stator.

[0006] According to one aspect of the present invention, a solenoid valve is provided, comprising: a valve body with a first passage and a second passage separated from the first passage; a coil body with a main area, a connecting area extending from the main area, and a mounting area extending from an end of the connecting area remote from the main area, wherein an axial through-hole passes through the main area, the connecting area, and the mounting area of ​​the coil body, the mounting area of ​​the coil body being connected to the valve body; a coil wound around the main area of ​​the coil body; a stator movably mounted at one end of the through-hole of the coil body, the stator having a third passage;a plunger arranged in the through-hole of the coil former, wherein the plunger can move between an initial state and an operating state; a magnetic flux return device attached to the connection area of ​​the coil former; an elastic seal arranged between the stator and the magnetic flux return device, allowing the stator axial movement;and a spring arranged between the stator and the plunger to move the plunger from the working state back to the initial state. When the coil is energized, the plunger moves by magnetic attraction between the stator and the plunger into the working state, in which the plunger rests against the stator and closes the third port of the stator, and the first and second ports of the valve body are connected to each other via the through-hole in the coil body. When the coil is de-energized, the plunger moves under spring force to the initial state, in which the plunger closes the first port of the valve body, and the second port of the valve body and the third port of the stator are connected to each other.

[0007] Preferably, the plunger defines a through-hole. Two plugs are mounted at the axial ends of the through-hole in the plunger. An internal spring is arranged in the through-hole of the plunger between the two plugs. Each axial end of the plunger has a connecting opening that links the through-hole of the plunger to the through-hole of the coil former.

[0008] Preferably, the plunger comprises a main body. The through-hole in the plunger is arranged in the main body. The radial outer diameter of the two axial ends is smaller than the radial outer diameter of the central region of the main body, so that channels are formed between the outer surfaces of the two axial ends of the main body and an inner surface of the through-hole of the coil body, and the channels are connected to the through-hole in the plunger via the connecting openings.

[0009] Preferably, the plunger further comprises a retaining cap which is mounted over an end of the axial ends of the main body of the plunger adjacent to the valve body and which receives the axial end and a corresponding plug therein to prevent the corresponding plug from being displaced from the through-hole of the plunger, wherein the retaining cap defines an axial through-hole which allows the corresponding plug to close the first passage of the valve body.

[0010] Preferably, a narrow gap is formed between the magnetic flux return device and an outer surface of the plunger, the width of which is less than 0.85 mm.

[0011] Preferably, the magnetic flux return device comprises a U-shaped frame and a magnetic flux plate. The frame has a lower section and an open end opposite the lower section. The lower section of the frame defines a receiving opening. One end of the stator is loosely received in the receiving opening of the lower section of the frame, and the elastic seal is positioned between the stator and the lower section of the frame.

[0012] Preferably, an outer edge of the magnetic flux plate is attached to the open end of the frame, and an inner edge of the magnetic flux plate is fixed to the connection area of ​​the coil former by overmolding. The inner edge of the magnetic flux plate defines a first through-hole that allows the plunger and a portion of the material from the connection area of ​​the coil former to pass through, and the distance between the outer surface of the plunger and an edge of the first through-hole of the magnetic flux plate is less than 0.85 mm.

[0013] Preferably, the magnetic flux plate has a plurality of secondary through-holes. The material of the coil former's connection area fills the plurality of secondary through-holes, forming a plurality of connecting bars, and each connecting bar links sections of the coil former's connection area located on opposite sides of the flux plate.

[0014] Preferably, a shoulder is formed on an outer surface of the stator to accommodate the elastic seal.

[0015] Preferably, a step is formed on an inner surface of the main area of ​​the coil body, and the step is configured such that it abuts an end surface of the stator.

[0016] Preferably, the coil body is rotatably mounted on the valve body.

[0017] Preferably, the elastic seal has a compression ratio of 20% to 45%.

[0018] Preferably, the stroke of the plunger is 0.32 mm to 0.50 mm.

[0019] In the solenoid valve described in the embodiments of the present invention, the stator is loosely mounted in the coil body and in the receiving opening of the magnetic flux return device. The stator is supported in a floating state by the elastic seal, which is made of an elastic material such as rubber. This allows for a small amount of axial deviation of the stator. 50 permitted. Since the stator can deviate in a direction away from the plunger when the plunger moves towards the stator under the influence of electromagnetic attraction, this prevents a strong shock vibration from occurring due to the collision between the plunger and the stator at the moment of contact, thereby reducing vibrations and noise from the source. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Preferred embodiments of the invention will now be described by way of example, with reference to the accompanying drawings. Identical structures, elements, or parts that appear in more than one figure are generally characterized identically in all figures in which they appear. The dimensions of components and features have been chosen for clarity and are not necessarily drawn to scale. The figures are listed below.

[0021] Fig. 1 is a view of a solenoid valve according to an embodiment of the present invention;

[0022] Fig. Figure 2 is a view showing the valve body of the solenoid valve. Fig. 1 in a different position relative to the electromagnetic body;

[0023] Fig. Figure 3 is a skewed representation of the solenoid valve of Fig. 1;

[0024] Fig. Figure 4 is a sectional view of the solenoid valve. Fig. 1;

[0025] Fig. 5 is a sectional view of a plunger, which is part of the solenoid valve of Fig. 1 is.

[0026] Fig. Figure 6 is an enlarged view of an area of Fig. 4;

[0027] Fig. Figure 7 shows a magnetic flux plate, which is part of the solenoid valve of Fig. 1 is;

[0028] Fig. Figure 8 is a sectional view of a solenoid valve according to a preferred embodiment of the present invention;

[0029] Fig. Figure 9 is an enlarged view of a circled area I of Fig. 8;

[0030] Fig. 10 is an enlarged view of a circled area II of Fig. 8;

[0031] Fig. Figure 11 is a sectional view of a solenoid valve according to a further preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EXECUTION FORMS

[0032] It will be directed to the Fig. 1 to Fig. 7. Reference made to a solenoid valve. 10 According to one embodiment of the present invention, a valve body 20 , a coil former 30 , a coil 40 , a stator 50 , a movable element 60 and a magnetic flux return device 70 .

[0033] The valve body 20 The valve body preferably consists of a plastic material and has a plurality of openings. In the present embodiment, the valve body has... 20 a first passage 22 and a second passage 24 The first passage 22 and the second passage 24 are located inside the valve body20 not in conjunction with each other.

[0034] The coil former 30 consists of an insulating material such as plastic and has a main area 32 , a connecting area 34 and a mounting area 36 . While the main area 32 In this embodiment, the hollow tube is cylindrical; however, depending on the actual design requirements, other shapes are also possible, for example, a rectangular or polygonal hollow tube. The connection area 34 extends radially from one end of the main area 32 and is between the main area 32 and the fastening area 36 arranged. A radial outer edge of the connection area 34 jumps over the main area 32 and the mounting area 36 before. The mounting area 36 It serves to attach the coil former. 30on the valve body 20 An axial through-hole 37 extends through the entire coil body 30 and stands with the first passage 22 and with the second passage 24 of the valve body 20 in connection. Preferably the through-opening has 37 in the axial direction of the coil body 30 a uniform size.

[0035] The coil 40 is around an outer surface of the main area 32 of the coil body 30 wrapped.

[0036] The stator 50 consists of a magnetically conductive material such as a ferromagnetic material or a soft magnetic material and is located at one end of the through-hole 37 of the coil body 30 installed. A third passage 52 extends through the stator in the axial direction of the magnet 50 .

[0037] The piston 60 consists of a magnetically conductive material such as a ferromagnetic material or soft magnetic material and is located at the other end of the through-hole 37 of the coil body 30 , which is the stator 50 It is mounted movably opposite each other in the axial direction. When the coil 40 When energized, the plunger can 60 under the influence of the magnetic field generated by the coil 40 is generated relative to the stator 50 move. As in Fig. As shown in section 5, the plunger has 60 a main body 61 with a central passage opening defined therein 62 . Plug 63 , 64 are at the respective ends of the passageway 62 Assembled. A first elastic element, for example a spring. 65 , is in a compressed state between the two plugs 63 ,64 switched to pre-tension the two plugs to their outermost positions in order to open the corresponding channel 22 or 52 to close. In this embodiment, a distal end of the plug protrudes. 64 under the influence of the elastic force of the spring 65 via an end surface of the main body 61 outwards and extends from the main body 61 out, so that the plunger 60 , if the solenoid valve 10 is energized, the stator 50 contacted and the plug 64 elastically attached to the stator 50 is pressed to open the passage 52 to close. The opposite ends of the spring. 65 loads on the plug 64 , 65 and are preferably firmly connected to the same. A fastening cap 66 is above one of the valve body 20 adjacent distal end of the main body61 of the diving piston 60 attached to the distal end and the plug 63 to include it and prevent the plug from 63 from the passageway 62 of the diving piston 60 falls out. Preferably, the fastening cap has 66 over a certain degree of elasticity. The fastening cap 66 defines a central passage opening 662 , which allows the plug 63 the passage 22 of the valve body 22 It closes. Preferably, the diameter of the through-opening is... 662 smaller than the outer diameter of the plug 63 Preferably, the end of the first passage adjacent to the plunger projects towards the plunger to provide a receptacle for the plug. 63 to form, and is dimensioned in such a way that it allows for intervention with the plug. 63 into the central opening 662the mounting cap.

[0038] An outer diameter of a central region of the main body 61 of the diving piston 60 is essentially equal to or slightly smaller than the diameter of the inner opening of the coil former 30 . Outer surfaces of the axial ends of the main body 61 have a smaller diameter than the outer surface of the middle area, so that between the outer surfaces of the two axial ends of the main body 61 and an inner surface of the coil former 30 channels each 67 are formed. Two connecting openings. 68 are each between the middle area and a corresponding end of the two axial ends of the main body 61 arranged, whereby the passage opening 62 inside the main body 61 with one of the corresponding channels 67 outside the main body 61is connected. A second elastic element, such as a spring, is used. 69 is between the stator 50 and the piston 60 arranged to hold the plunger 60 to return to its starting position when the solenoid valve 10 in a de-energized state. Opposite ends of the spring. 69 are each connected to the stator 50 and the piston 60 tied together.

[0039] The magnetic flux return device 70 is used together with the stator 50 and the piston 60 to form a magnetic flux return path when the coil 40 is energized. In this embodiment, the magnetic flux return device has 70 a U-shaped magnetic flux frame 72 and a magnetic flux plate 74 The frame 72The stator has one end with a base and an opposite end without a base. 50 is at the end with the bottom of the frame 72 attached. One outer side of the magnetic flux plate 74 is at the end without a bottom of the frame 72 attached, and an inside of the magnetic flux plate 74 is at the connection area 34 of the coil body 30 Attached by overmolding. The U-shaped frame 72 and the magnetic flux plate 74 Both consist of a magnetically conductive material. It is applied to Fig. 7 referenced in which the magnetic flux plate 74 in its center a first passage opening 76 with a larger opening diameter, and a multitude of secondary through-holes 78 with a smaller opening diameter around the first passage opening 76 defined. The magnetic flux plate 74 is at the connection area34 of the coil body 30 Attached by overmolding. During the overmolding of the coil former. 30 Does this encapsulate the coil former? 30 forming material the magnetic flux plate 74 with the exception of the outer radial end regions of the magnetic flux plate 74 essentially one, whereby part of the material passes through the first opening. 76 the magnetic flux plate passes through to form a connecting wall 77 to form, and part of the material the second passage openings 76 the magnetic flux plate 74 fills to form connecting pins (not shown). The connecting wall 77 and the connecting pins join together the material of the connection area 34 of the coil body 30 , located on opposite sides of the magnetic flux plate. The provision of connecting pins can increase the rigidity of the coil former. 30significantly increase. This strength-enhancing effect becomes even more pronounced when the connecting wall 77 of the coil body 30 , which are in the first passage opening 76 the magnetic flux plate 74 is arranged, is thin.

[0040] The inner radial end of the magnetic flux plate 74 extends as deep as possible into the interior of the coil body's connection area 30 into, to the contact area between the magnetic flux plate 74 and the connection area 34 The coil former is enlarged to form a secure connection. Preferably, the connecting wall has 77 the coil 30 , which are in the first passage opening 76 the magnetic flux plate 74 is arranged, with a thickness of less than 0.85 mm, creating a narrow air gap between an edge of the through-hole of the magnetic flux plate 74and the outer surface of the piston 60 The width W of the air gap is preferably less than 0.85 mm. In this embodiment, the width of the air gap is 0.5 mm. This results in the inner edge of the magnetic flux plate being positioned... 74 as close as possible to the outer surface of the piston 60 , which reduces the magnetic resistance of the air gap. Compared to the conventional solenoid valve, a difference must be made between the outer surface of the plunger. 60 and the magnetic flux plate 74 No passage is formed, which is why the width of the air gap between the two can be significantly reduced, and thus the magnetic attraction between the plunger and the stator can be significantly increased during operation of the solenoid valve.

[0041] The outer radial edge of the magnetic flux plate 74 can be done with the open end of the frame 72The frame can be permanently connected by soldering or crimping, or detachably connected, for example, by a snap connection. In this embodiment, the frame... 72 a one-piece construction. It goes without saying that the frame 72 It can be formed by two L-shaped elements that are firmly connected to each other. Preferably, the base of the frame defines 72 a receiving opening 722 , and one end of the stator 50 can be done, for example, by soldering in the receiving opening 722 of the frame 72 be determined.

[0042] Sealing designs such as O-ring seals 80 can between the coil body 30 and the valve body 20 and between the coil former 30 and the stator 50 be planned.

[0043] A pair of connecting rods 90 is used to connect the valve body 20 with the coil former 30used. In particular, the fastening area forms 36 of the coil body 30 a round or arc-shaped groove 38 , the valve body 20 forms a pair of connecting openings 26 , and the connecting rods 90 enter through the respective connecting openings 26 through and then in the groove 38 of the coil body 30 recorded. In this way the valve body 20 with the electromagnetic body (which is the coil body) 30 , the coil 40 , the stator 50 , the plunger 60 and the magnetic flux return device 70 (includes) connected. This allows the magnetic body to 20 in the solenoid valve described in the present embodiment, rotate relative to the electromagnetic body, so that the orientation of the passages 22 , 24 of the valve body 20It can be adjusted relative to the electromagnetic body to suit various orientation applications.

[0044] It is understood that the rotatable connection between the valve body 20 and the coil former 30 can be achieved in other ways. For example, the round or arc-shaped groove is formed in the valve body, and the connecting openings are arranged in the coil body.

[0045] The operating principle of the solenoid valve according to the present invention is explained below.

[0046] In operating condition, the coil 40 Powered by electricity to generate a magnetic field. The plunger 60 is influenced by the magnetic field of the stator 50 tightened so that the plunger piston experiences the elastic force of the outer spring 69 overcomes the obstacle and moves into a working position. In this working position, the plug encounters... 64of the diving piston 60 to the end face of the stator 50 and thereby closes the passage 52 of the stator 50 The stopper 63 is from the first passage 22 of the valve body 20 spaced apart. The first passage 22 and the second passage 24 The valve body protrudes beyond the through-opening. 37 in the coil body 30 together. A fluid such as air can pass through the first passage. 22 flow into the valve and can pass through the second passage 24 outflow. After interruption of the power supply to the coil 40 The electromagnetic attraction between the stator and the piston disappears. 60 , so that the plunger is moved by the restoring force of the outer spring 69 is returned to its original position. In this position, the plug seals. 63 of the diving piston60 the first passage 22 of the valve body 20 , and the second passage 24 of the valve body and the passage 52 of the stator 50 communicate via the passageway 62 and the connecting openings 68 in the piston 60 and the canals 67 .

[0047] The Fig. 8 to Fig. Figure 10 shows a solenoid valve according to a further embodiment of the present invention, the operating principle of which is the same as that of the solenoid valve of the preceding embodiment. The differences lie in the fact that in this embodiment the stator 50 in the intake opening 722 of the lower area 742 of the frame 72 the magnetic flux return device 70 is recorded while moving. The recording opening 722 is preferably a through-opening. An elastic seal. 100is between the stator 50 and the frame 72 the magnetic flux return device 70 switched. The elastic seal 100 is a one-piece, continuous O-shaped construction, such as a rubber ring. Specifically, it is located on the outer surface of the stator. 50 adjacent to the lower part of the frame 72 a ring groove 51 formed, and emerging from the groove 51 protruding part of the elastic seal 100 lies in the axial and radial direction at the lower area 724 of the frame 72 on. On an interior surface of the main area 32 of the coil body 30 adjacent to the piston 60 is a level 322 formed, and an inner surface of the step 322 is positioned further inwards than the outer surface of the stator 50 , i.e., the inner surface of the step 322 and the outer surface of the stator50 They partially overlap each other in the radial direction. The elastic seal 100 is between the stator 50 and the lower area 724 of the frame 72 compressed, and the lower area 724 of the frame 72 exerts pressure via the elastic seal 100 in the direction towards the piston 60 an axial thrust force on the stator 50 out, so that the end surface of the stator 50 at the stage 322 of the main area 32 of the coil body 50 is involved, as in Fig. 10 shown. That is, the stator 50 and the elastic seal 100 between the stage 322 of the main area 32 of the coil body 30 and the floor area 724 of the frame 72 The compression is elastically absorbed in the axial direction of the solenoid valve. Preferably, the compression coefficient of the elastic seal is100 Between 20% and 45%. Too high a compression amount reduces the noise reduction. Too low a compression amount impairs the stator's positional accuracy.

[0048] In this embodiment, the stator is located 50 loose in the intake opening 722 of the lower area 724 of the frame 72 the magnetic flux return device 70 The stator 50 is achieved through the elastic seal 100 supported, which is in a floating state, and the elastic seal 100 It consists of an elastic material such as rubber. This allows for a small amount of axial deviation of the stator. 50 approved. If the stator coil 40 When current is applied, the plunger moves. 60 under the influence of the electromagnetic attraction force in the direction of the stator 50 Since the stator 50in one of the piston 60 The fact that the direction leading away can deviate is prevented from happening at the moment of contact of the plunger. 60 with the stator 50 through the collision between the plunger 60 and the stator 50 A strong shock effect is created, thereby reducing vibrations and noise from the source. Preferably, this is done between the stator. 50 and the coil former 30 an O-ring seal 80 switched on.

[0049] The stroke of the piston 60 preferably 0.32 mm to 0.50 mm. If the stroke of the plunger is too large 60 The stator coil would have to be subjected to an excessively high electric current. The piston stroke would be too short. 60 However, it impairs the flow of the fluid.

[0050] Fig.Figure 11 shows a sectional view of a solenoid valve according to a further embodiment of the present invention, which differs from the previous embodiment in that in this embodiment a received end 54 of the stator 50 , which is in the intake opening 722 of the frame 72 is recorded, has a smaller outer diameter than the stator 50 adjacent area, so that at a connection point of the recorded end 54 and the adjacent area a shoulder 56 is formed. The elastic seal 100 surrounds the recorded end 54 and is located between the shoulder 56 and the lower area 724 of the frame 72 compressed.

[0051] Verbs such as “to include”, “to exhibit”, “to contain” and “to have”, as well as their synonyms, which are used in the description and in the claims of the present application, express that the said element or feature is present, but they do not exclude the possibility that further elements or features are also present.

[0052] It is understood that certain features of the invention, which for the sake of clarity have been described in the context of individual embodiments, may also be combined in a single embodiment. Conversely, various features, which for the sake of brevity have been described in the context of a single embodiment, may likewise be provided separately or in expedient subcombinations.

[0053] The embodiments described above represent only one example. Those skilled in the art will recognize that various other modifications are possible within the scope of the invention as defined by the attached claims. QUOTES INCLUDED IN THE DESCRIPTION

[0054] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0055] US 5992461

[0002]

Claims

[1] Solenoid valve comprising: a valve body ( 20 ) with a first passage ( 22 ) and a second passage ( 24 ), which is separated from the first passage; a coil former ( 30 ), encompassing a main area ( 32 ), a connecting area ( 34 ), which extends from the main area, and a mounting area ( 36 ), extending from an end of the connection area far from the main area, wherein an axial through-opening ( 37 ) passes through the main area, the connection area and the mounting area of ​​the coil body, wherein the mounting area of ​​the coil body is connected to the valve body; a coil ( 40 ), which is wound around the main area of ​​the coil body; a stator ( 50 ) with a third passage ( 52 ); a plunger ( 60 ), which is in the passage opening ( 37 ) of the coil body ( 30 ) is arranged to be movable, whereby the plunger can move between an initial state and a working state; a magnetic flux return device ( 70 ), which are located at the connection area ( 34 ) of the coil body ( 30 ) is attached; and a spring ( 69 ), which move the plunger from the working state to the initial state between the stator ( 50 ) and the plunger ( 60 ) is arranged; where the plunger ( 60 ) when the coil is energized ( 40 ) is moved into the working state by the magnetic attraction between the stator and the plunger piston, in which the plunger piston rests against the stator and the third passage ( 52 ) of the stator closes, and in which the first and second passages ( 22 ,24 ) of the valve body ( 22 ) via the passage opening ( 37 ) in the coil body ( 30 are connected to each other; and where the plunger ( 60 ), if the coil ( 40 ) is de-energized, moved under the pressure of the spring into the initial state in which the plunger enters the first passage ( 22 ) of the valve body closes, and in which the second passage ( 24 ) of the valve body and the third passage ( 52 ) of the stator are connected to each other, characterized by that the stator ( 50 ) at one end of the passage opening ( 37 ) of the coil body ( 30 ) is movably mounted and that an elastic seal ( 100 ) between the stator ( 50 ) and the magnetic flux return device ( 70 ) is arranged in such a way that the stator can deviate axially. [2] Solenoid valve according to claim 1, wherein the plunger ( 60 ) contains a through-opening ( 62 ) defined, two plugs ( 63 , 64 ) each mounted at axial ends of the through-hole in the plunger, an internal spring ( 65 ) in the passage opening ( 62 ) of the plunger and is arranged between the two plugs, and each axial end of the plunger has a connecting opening ( 68 ) has the passage opening ( 62 ) of the plunger with the through-hole ( 37 ) of the coil body. [3] Solenoid valve according to claim 2, wherein the plunger ( 60 ) a main body ( 61 ) has the passage opening ( 62) in the immersion piston in the main body and the radial outer diameter of the two axial ends is smaller than the radial outer diameter of a central region of the main body, so that between the outer surfaces of the two axial ends of the main body ( 61 ) and an inner surface of the passage opening ( 37 ) of the coil body channels ( 67 ) are formed and the channels extend through the connecting openings ( 68 ) with the through-opening ( 62 ) in the immersion flask. [4] Solenoid valve according to claim 3, wherein the plunger ( 60 ) furthermore a fastening cap ( 66 ) has the mounting cap over one of the valve body ( 20 ) adjacent axial end of the main body ( 61 ) is attached and the axial end and a corresponding plug ( 63) therein to prevent the corresponding plug from being displaced from the through-hole of the plunger, and wherein the retaining cap has an axial through-hole ( 662 ) defined to allow the corresponding plug ( 63 ) the first passage ( 22 ) of the valve body. [5] Solenoid valve according to one of the preceding claims, wherein between the magnetic flux return device ( 70 ) and an outer surface of the piston ( 60 ) a narrow gap (W) is formed which has a width of less than 0.85 mm. [6] Solenoid valve according to one of the preceding claims, wherein the magnetic flux return device ( 70 ) a U-shaped frame ( 72 ) and a magnetic flux plate ( 74 ) includes a lower area ( 724) and has an end opposite the lower area, the lower area of ​​the frame has a receiving opening ( 722 ) defines an end of the stator ( 50 ) is loosely received in the receiving opening of the lower part of the frame and the elastic seal ( 100 ) between the stator ( 50 ) and the lower area ( 724 ) of the frame ( 72 ) is arranged. [7] Solenoid valve according to claim 6, wherein an outer edge of the magnetic flux plate ( 74 ) at the open end of the frame ( 72 ) is attached, an inner edge of the magnetic flux plate ( 74 ) at the connection area ( 34 ) of the coil body ( 30 ) is defined by overmolding, the inner edge of the magnetic flux plate forms a first through-hole ( 76 ) defined so that the plunger and part of the material of the connection area ( 34) of the coil body can pass through these, and a distance between the outer surface of the plunger ( 60 ) and an edge of the first passage opening ( 76 ) the magnetic flux plate ( 74 ) is smaller than 0.85 mm. [8] Solenoid valve according to claim 6 or 7, wherein the magnetic flux plate ( 74 ) a multitude of secondary passage openings ( 78 ) has, the material of the connection area ( 34 ) of the coil body the multitude of second through-holes ( 78 ) fills to form a multitude of connecting bars, and each of the connecting bars sections of the connecting area ( 34 ) the coil ( 30 ), located at opposite ends of the magnetic flux plate ( 74 ) are located, connecting them. [9] Solenoid valve according to claim 6, 7 or 8, wherein on an outer surface of the stator ( 50 ) a shoulder ( 56) for the installation of an elastic seal ( 100 ) is formed. [10] Solenoid valve according to one of the preceding claims, wherein on an inner surface of the main area ( 32 ) of the coil body ( 30 ) one level ( 322 ) is formed and the stage is configured such that it connects to an end face of the stator ( 50 ) encounters. [11] Solenoid valve according to one of the preceding claims, wherein the coil body ( 30 ) on the valve body ( 20 ) is mounted in a rotatable manner. [12] Solenoid valve according to one of the preceding claims, wherein the elastic seal ( 100 ) exhibits a compression ratio between 20% and 45%. [13] Solenoid valve according to one of the preceding claims, wherein the stroke of the plunger ( 60 ) 0.32 mm to 0.50 mm.

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