JPS5874979A - Proportional action solenoid valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to proportionally actuated solenoid valves.

The present invention is useful in electromagnetic solenoid valves operable to control fluid in conjunction with diaphragm operated valves. Such solenoid valves are known and used to control the flow of liquid or air. However, such valve combination devices are often spring-loaded and operate in conjunction with connecting rods or ball valves, or are complex assemblies with flexible diaphragms made from special materials. It is. These devices respond to changes in current and/or voltage across the solenoid and allow fluid flow through the valve as a function of these valves. a mechanical spring force,
The applied forces, such as electromagnetic fields and/or fluid pressure, are balanced or calibrated to permit operation of the valve in a given mode. These valves are generally not electrically adjustable. However, in at least one case there is an adjusting device, such as a screw, adapted to vary the flow and pressure of the fluid acting against the biasing spring, thereby varying the operating state of the valve. There is. The biasing spring of such devices can vary, as can the number of turns of the solenoid coil, the materials of construction, and the dimensions of the assembly. These devices are somewhat complex and relatively expensive to assemble.

Solenoid valves such as those described above can control the oxygen content of the exhaust gas,
It finds particular application in newer automobiles equipped with various small processing units or microprocessors that receive input signals indicative of physical parameters such as vehicle speed, engine speed, engine temperature, etc. Such a microprocessor receives these input data signals and calculates the fuel supply amount,
The data is evaluated and/or compared to produce a signal that controls spark advance angle or other operating parameters. In the present invention, such a microprocessor operates a solenoid valve with a given current amplitude to produce an output signal that provides a measurable or desired output from a variable fluid source, such as a manifold vacuum. It is possible. An automobile microprocessor, such as those described above, can control the duty cycle or ON time of the square wave signal to maintain fluid pressure or vacuum at a desired level for a given current signal. Such control may occur even as engine compartment and solenoid temperatures change. The current level signal may also be obtained from a simple device such as a signal generator or even a simple power supply if closed loop control is not required.

It is therefore an object of the present invention to provide a simple valve assembly, particularly one that is electromagnetically adjustable and operable in response to varying input electrical signals.

The present invention is useful in electromagnetic solenoid valve assemblies having a central hole terminating in a non-magnetic seat within an interior central chamber having an outlet boat. A flat disc armature or closure is provided operable within the central chamber to contact the non-magnetic sheet and seal fluid flow between the central bore and the exit boat. The magnetically induced force required to actuate the magnetic closure member is influenced by the mass of the magnetic closure member and the diameter of the non-magnetic sheet. The magnetic closure member may be perforated, serrated, or otherwise stamped to permit fluid flow therethrough to permit communication between the central hole and the outlet port. The invention can be operated in conjunction with known valve systems. Additionally, the solenoid is capable of operating in situations where fluid pressure is used to control vacuum-operated or vertical pressure-operated devices.

Modes of carrying out the invention will now be described with reference to the accompanying drawings, which illustrate specific examples of the invention.

Like numerals in the drawings indicate like members.

A solenoid valve assembly 10 constructed in accordance with the present invention is shown in FIG. It is shown as cooperating with 12.

The actuation combination 11 is connected between a vacuum source 300 and a vacuum actuated motor 301. Vacuum in the sense indicated here is a pressure below atmospheric pressure. The solenoid valve assembly 10 includes an outer member or mounting bracket 14 shown in FIGS. 2, 5A, and 5B;
a top 13 and a bottom 15, a hollow cylindrical magnetic core pole piece or central member 16, an electrical winding 18 mounted around the central member 16, a sheet 20 of non-magnetic material having a lower surface 21 (FIG. 6); An annular magnetic closing member 22 (
3) and a pace member 23 forming at least one opening 129. Figure 1 shows a pair of conductors 15.
An electrical connection device 150 is shown in the form of a pair of terminals connectable to a suitable power supply 152 at 4 . The power supply source 152 is a direct current source, a square wave generator,
It may be a variable resistor, a pulse width modification or modulation circuit, or an on-board controller/viewer serving as the signal source.

Central member 16 defines a cylindrical central bore 24 having an inlet port 26 and an outlet boat 28 . Around this central member 16 is a cylindrical sleeve or reference member 3.
0, and this reference member 30 is preferably made of a magnetic material that increases magnetic flux density. electrical winding 18
is enclosed on its upper, lower and inner diameter surfaces in a bobbin 32 of plastics material, which bobbin 32 surrounds and engages the reference member 30, thereby causing the central member 1 to
It encompasses almost the entire length of 6. A subassembly consisting of central member 16, reference member 30, bobbin 32 and electrical winding 18 is formed by an open slot 35 and bobbin 32 formed by outer member or bracket 14 (FIG. 5A). It is attached to a flange 36 and held rigidly in place. Although not required, an enclosure 38 surrounds the outer diameter of the electrical winding 18 in this embodiment. A washer retainer or top member 40, preferably of magnetic material, is attached to the top of the enclosure 38 in FIG. 2 and defines an opening 42. Central member 16 and reference member 30 project through opening 42 . The outer member 14 has a top member 4 at its upper end.
0 to secure the top member 40 and subassembly within the outer member 14.

As shown in FIG.
and a flange or right-angled foot 44 having a lower surface 45
It ends in The lower end of the reference member 30 defines a flange 48 having a counterbore 50 having an outer diameter 49 and a wall 51 . The abrasive sheet 20 defines a shoulder 52, an aperture 53, a wall 54 having an outer surface 56 and an inner surface 58, and a diameter shown as "y" in FIG. Flange 4
The outer diameters 47 and 49 of 4 and 48 are equal, respectively;
It is in contact with the inner surface 58 of the sheet 20.

The flange 4B of the reference member 30 is held in contact with the shoulder portion 52 and press-fitted into the opening 53. The central member 16 is adjustable along a vertical axis to bring the flanges 48 and 44 into abutment or to adjust the central member 160 lower surface 45.
can be brought into close contact with the lower surface 21 of the seat 20 and the closure member 22.

In this manner, the central member 16 is adjustable to meet specific force requirements as a function of distance relative to the closure member 22.

An alternative embodiment of the configuration of the central member 16, seat 20 and reference member 30 is shown in FIGS. 11 and 12.

FIG. 11 shows a reference member 30 and a non-magnetic member 231 in which the non-magnetic sheet 20 is a single drawn thin-walled tube.
The thickness of this pipe material is 0.3 m (0
, 012 inches), so that the thickness of the central member 16 can be increased to improve the magnetic flux density. Non-magnetic member 2311d'/-) area 23
3 and a tubular extension 235 of cylindrical shape. The outer and inner diameters of the seat 233 are greater than the outer and inner diameter dimensions of the tubular extension 235, and the seat 233 forms a shoulder 237 against which the flange or right foot 44 of the central member 16 is restricted from upward movement. . C) 233
further forms a lower surface 21 that comes into contact with the closure member 22 . The central member 16 is adjustable to meet specific force requirements as a function of distance to the closure member 22. FIG. 12 shows a second variant embodiment of the non-magnetic sheet 20, with the sheet 20 and 32 is formed as an integral member 240 from a non-magnetic material by casting, molding or other methods. This member 240 of FIG. 12 defines a cylindrical passageway 242 and has a wall 246 similar to reference member 30 of FIGS. 2 and 6, but with a flange extending beyond the thickness of wall 246. A reference member 244 without a flange such as 48 is adapted to be received.

The central member 16 is slidable within the reference member 244 and the wall portion 24
upward movement beyond the point where flange 44 contacts 6 is restricted. The central member 16 is slidable to change the relationship between the flange 44 and the underside of the seat 21 and is thus adjustable to meet specific force requirements as a function of distance from the closure member 22. It is. In this embodiment, reference member 244 is made from a magnetic material and can be thin or thick walled. This is because this material is not integrated with the nonmagnetic sheet 20 and can be used to increase magnetic flux density.

In FIG. 2, bobbin 32 forms a shoulder 59. In FIG. In FIG. 6, the outer wall 56 and shoulder 52 of the sheet 20 abut against the shoulder 59 of the bobbin 32 and are rigidly held thereby. As shown in FIG. 6, the distance between the lower surface 21 of the sheet and the lower surface 45 of the central member is indicated by "x".

A sealing gasket 55 is disposed within the seal slot 46 of the central member 16 and contacts the counterbore wall 51 to provide a seal therebetween. Setting the proper height or distance "x" is accomplished by securing the central member 16 to the top surface 60 of the reference member 30 by any known method such as welding. Filter 62 is central member 1
6 to prevent particles from entering the solenoid valve. Filter 62 may be of cellulosic material.

Diaphragm operated valve 12 illustrates the use of solenoid valve assembly 10 to control the supply of vacuum source 300 to vacuum motor 301 . Diaphragm operated valve 12 has a bottom cover 102 secured to the lower end of pace member 23 by a shell 104. The bottom cover 102 includes a port 106 and a passageway 10 communicating with a vacuum source 300.
8 is formed. Pace member 23 has a neck 110 and a seal slot 11 that receives a seal gasket 116.
A flange 112 having a diameter of 4 is formed.

Flanges 36 and 112 abut each other, with sealing gasket 116 providing an airtight seal therebetween. Neck 110 is disposed within slot 35 of outer member 14 to maintain diaphragm actuated valve 12 in communication with solenoid valve assembly 10 . The flange 112 of the pace member 23 and the bobbin 32 cooperate to form an annular chamber 118 such that the annular magnetic closure member 22 is operable to engage the seat 20. Closing member 2 shown in FIG.
2 has an inner top surface 120 and a diameter rZJ. Closure member 22 defines apertures 122 that permit fluid communication therethrough. As shown in FIG. 2, the closure member 22 is maintained in a reference position in close proximity (on the order of 0.0015 inches) to the lower surface 21 of the non-magnetic sheet 20. Generally, the seat 20 is made of a soft material such as brass, and the closure member 22 is made of a hard material such as iron or steel, so that when the two members come into contact, the soft material contacts the hard material. giving. This hard-soft material contact provides minimal deformation to the inner top surface 12 of the closure member 22.
0 is actuated to contact the underside 21 of the seat 200 to provide better seating and a tighter seal, thereby limiting communication between the hole or passageway 24 and the chamber 118.

Sheet 20 can also be made of a hard material such as non-magnetic stainless steel or plastic. The opening/closing member 22 in normal operation is a spring 124 attached to the base member 23.
20). Base member 23 includes an upright cylindrical portion 128 terminating in a generally planar flat surface 127 . Spring 1
24 are arranged around this cylindrical portion 128 and are arranged on the surface 1
27 assists in positioning the magnetic closure member 22. A cylindrical portion 128 extends into the chamber 118 and has a flat surface 1
27 limits the downward movement of the closure member 22. The volume of cylindrical portion 128 also serves to limit the volume of chamber 128, thereby allowing more rapid changes in fluid pressure and volume within chamber 118.

The illustrated valve 12 is a dual diaphragm operated valve in which diaphragms 200 and 202 are arranged parallel to each other to form an atmospheric chamber 204 that communicates with the atmosphere through a plug 206 defining an opening 208 therebetween. , plug 206
itself is inserted into an opening 210 formed between the base member 23 and the cover 102. The opening 208 is the shell body 1
It communicates with the atmosphere through a boat 211 formed by 04.

A connecting sleeve 214 with open boats 215 and 217 is arranged above the passage 108 . Valve 12 is seated on coupling sleeve 214 to seal boat 215 with sealing device 21 shown in its home position in FIG.
Contains 2. Movable plates 218, 219 are fixed to diaphragms 200 and 202, respectively. Plate 219 defines an annular opening 2201, an annular contact ridge 222, and an annular chamber 224, into which a cap member 225 is inserted to seal chamber 224. A spring 216 seats on cap member 225 and urges sealing device 212 into the home position and into contact with sleeve 214 . The sealing device 212 is a sleeve 214
to seal communication from sleeve 214 and vacuum source 300 through opening 220 to chamber 226 formed between plate 219 and cover 102 . Room 22
6 communicates with the vacuum source 301 through the boat 228 formed by the cover 102 and the coupling device 230.

Cover 102 defines passageways 130 and 132 and orifice 134. Base member 23 and plate 218 cooperate to form a vacuum chamber 136 therebetween. One vacuum state force 5, vacuum source 300 to passage 130
, 132 and orifice 134 to chamber 136, and this vacuum communicates from chamber 136 to chamber 118 through opening 129. FIG. 13 shows a modified embodiment of the assembly 1o shown in FIG. show. The bobbin 32 of the assembly 10 defines a lower surface 404 open to the chamber 118, and the bias spring 402 is attached to the lower surface 404.
The magnetic closure member 22 is arranged so as to be in contact with the magnetic closure member 22 . A biasing spring 402 provides a force that acts to maintain the aforementioned closure member 22 in a normally open relationship with the lower surface 21 of the non-magnetic seat 10. Furthermore, the biasing spring 40
2 maintains the closure member 22 in a reference position perpendicular to the vertical axis of the bore 24 as shown in FIGS. 2 and 13. It has been found that the act of maintaining the closure member 22 in a reference position in this manner prevents angular displacement of the closure member 22 from its perpendicular relationship to the vertical axis.

The second one is located at a reference position close to the seat 20 during operation.
The illustrated closure member 22 responds quickly to magnetic flux induced by a current passed through the electrical winding 18 to generate magnetic flux in the valve assembly 10 at a given voltage. A magnetic circuit is created through the outer member 14, the closure member 22, the center member 16, the reference member 30, the top member or washer retainer 40, and the air gap between the outlet boat 28 of the center member 16 and the closure member 22. In the steady state, that is, the direct current is ``Spiritual #i!'' 18, the closure member 22 is pulled towards the seat 2.0 and held in this position until the magnetic flux is interrupted. When the current is interrupted, i.e. when the magnetic flux is interrupted, the closing member 22 is lowered by gravity and the pressure difference to a reference position supported by a spring 124, as shown in FIG. 22 to the reference position.

When a subatmospheric pressure or vacuum is applied to port 106, vacuum conditions communicate through passageways 108, 130, 132 and orifice 134 to chambers 136 and 118. The vacuum in the chamber 136 acts against the atmospheric pressure and the diaphragm 2
218, 219 will move vertically upward from the reference position shown in FIG. As raised lip 222 moves upwardly, it lifts seal 212 and provides vacuum communication between passageway 108 and chamber 226 through opening 200 and port 215.

In the combined valve 10 and 120 arrangement shown in FIG.
and 132, in communication with solenoid valve assembly 100 chamber 118 through orifice 134, chamber 136 and opening 129. The central member 16 directs the atmosphere to the inlet boat 2 as shown.
6. communicates with chamber 118 through passageway or hole 24 and outlet port 28;

When electrical winding 18 is energized by power supply 152 , a magnetic flux is induced that attracts closure member 22 toward central member 22 . The sheet 20 has a closing member 220 surface 120
, thus sealing communication between chamber 118 and passageway 24 .

The force (magnetic flux) required to move the closure member 22 is related to the mass of the closure member 22, the pressure difference between the chamber 118 and the passage or hole 24, and the diameter ryJ of the seam 20. The diameter "y" of the shell 20 and the mass of the closure member 22 are determined upon assembly. The operating variables that influence the movement of the closure member 22 are therefore the pressure difference and the magnetic force, the latter being proportional to the current through the winding 18 at that voltage.

The force of the magnetic field of a solenoid valve is proportional to the input power to the electrical winding, as shown in Figure 7. (Willey & Saiz, Inc., 1941, p. 232), in this example the hole 24 is at atmospheric pressure and the vacuum (pressure lower than atmospheric pressure) is in the chamber 1.
18, a pressure difference is created acting on the surface 120 of the closure member 220 to keep the closure member 22 open. The attractive force of the magnetic flux is the mass of the closure member 22 (approximately 1.
41r), must overcome the forces due to gravity and the downward pressure exerted on surface 120 to seat closure member 22 on spring 124 and hold it in its home position. Since the mass of closure member 22 is constant, the magnetic force required to move closure member 22 is a function of the pressure difference. In an ideal state, this magnetic force is applied to the electrical winding 18 as shown in FIG.
is found to be proportional to the current (amperes) passing through it. In the present invention, the pressure difference (in mercury (in or 2.54 cra)) as a function of current (milliampere)
An empirical illustration of the change in vacuum (by vacuum) is shown and illustrated in FIG. Although the linear functions of FIG. 9 show the shape of the hysteresis loops, a linear function is superimposed between these loops as an approximation to the ideal case of FIG. This function in Figure 9 has a resistance of 43 ohms and 16
It has an electrical input of 0 Hertz and a column of mercury of 35.6 cIIt (
14 inches) for a solenoid that operates against a vacuum input. Similar curves have been determined for various resistances, frequencies and pressure differences.

12.7 crrt (5 inches) of mercury for a low frequency square wave input signal such as about 80 hertz.
It has been found that there is a shift in the set point that gives a significant change to the vacuum input level, such as from 50.8 CIIL (20 in.) of vacuum to 50.8 CIIL (20 in.) of vacuum. For such low frequency operation, the orifice 134 may be provided with a laminar to the jet flow structure to improve fluid flow characteristics to alleviate the set point movement problems discussed above. It has been discovered that it can be done.

Any given point along this linear function can be selected and designated as a set point. At this set point, the corresponding amperage value for the solenoid having the characteristics that produced this curve is such that the closure member 22 resists a subatmospheric vacuum to seal communication between the bore 24 and the chamber 11B.
A magnetic field strong enough to attract the magnetic field to the sheet 20 is induced.

Therefore, the actuation of the closure member 22 in contact with the seat 20 is constant or related to a given amperage value and the chamber 11
8 and the hole 24 is at or below a set point along the curve.

It is also noted that the vacuum within chamber 118 is communicated through orifice 134. There are significant differences in the diameters of holes 24 and orifices 134 and sheets 20. - in the exemplary application orifice 13
The diameter of 4 is approximately 0.51cm (0,020in),
The diameter of the hole 24 is approximately 1.52 m (0,060 in).
), and the diameter of the sheet 20 is approximately 7.62 m (0,30
0in'). However, the pressure difference between the chamber 118 and the hole 24 is a function of the magnetic force acting on the closure member 22 because the spacing between the surface 120 of the sheet 20 and the closure member 22 is very small.

The fact that orifice 134 is shown within valve 12 does not affect the operation of solenoid valve assembly 10. This is because a similar communication orifice can be arranged integrally with the communication means or opening 129 or the solenoid valve assembly 10.

The operation of the device described above is shown as being proportional to the applied power, amperage or voltage input to the electrical winding 18. The curves of the above-mentioned Lotters reference are shown in Fig. 7 on the Cartesian coordinate axis.
(ordinate axes) as a family of curves. As noted, the horizontal or horizontal axis is the length of the stroke of the armature (in this case closure member 22) and the vertical or vertical axis represents the force. In this example, this amateur's stroke has extremely small increments;
That is, approximately 0.038 m (approximately 0.0015 in) (
1) Approximately. However, since there is a rotation interval rxJ from the central member 16 to the lower surface 21 of the seat 20, the length of the stroke to which the force must act is x(l
lII) 10,038m (x”+O,0O15
in).

The actual movement of the closure member 22 has therefore been limited to a maximum of /J% in order to provide a more rapid response and better control. If a pair of vertical lines are placed along the horizontal axis of Figure 7 at distances X and
n), these vertical lines intersect a group of curves at various amperage values. The solenoid valve thus operates within a very narrow range of these variables, thereby providing better control of operation to regulate fluid flow between chamber 118 and bore 24.

The solenoid valve assembly described above opens and closes at either set point. That is, it opens and closes at any point appearing in the linear function of FIG. In this case, the pressure difference can be selected to be responsive to a given input current, or the input current (shown on the horizontal axis of FIG. 8) can be selected to move the closure member 22 at a given pressure difference. can be selected. In either case, the solenoid valve assembly 10 has been found to be temperature insensitive at given peak amperage values over the normal operating temperature range of an automobile engine compartment. This situation is common when a computer installed in a car is used as such a signal source when the signal source is a square wave and the control is performed by controlling the duty cycle, that is, the time during which the current flows. arise. At higher temperatures, this duty cycle is increased to compensate for these changed high temperature conditions. This is shown in Figure 10, where the output curve is shown at two temperatures 23.3
The results show only significant changes in the position of the curves.

In FIG. 6, the dimension "y" of the sheet shown is relatively large compared to the diameter of the hole 24. Such dimensional differences accommodate operation by vacuum actuated devices such as diaphragm actuated valve 12. If a high pressure (above atmospheric pressure) pressure source is attached to the central member 160 inlet boat 26, a restriction 303 in FIG.
02 is the hole 24 and slave motor or pressure actuated device 3
04 is connected. The non-magnetic sheet 20 for high pressure operation is constructed with a diameter generally based on empirical testing to determine a mode of operation consistent with the slave motor 304 and ambient operating conditions. However, the dimensions of the seat for operation at such high pressures will be much closer to the holes 24 than in the case of vacuum operation.

While one particular embodiment of the invention has been illustrated and described,
Obviously, various modifications and variations may be made. It is therefore intended that the appended claims cover all modifications and variations falling within the spirit and scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a side view of the solenoid valve assembly of the present invention showing its connection to a power supply source and a vacuum source. FIG. 2 is an enlarged vertical sectional view of the proportional actuating solenoid valve assembly of the present invention shown in FIG. FIG. 3 is a plan view of the closure member shown in FIG. 1; 4 is a partial cross-sectional view of a modified embodiment of the valve assembly of FIG. 2; FIG. FIG. 5A is a plan view of the outer member or mounting bracket. FIG. 5B is a side view of FIG. 5A. FIG. 6 is a partially enlarged sectional view of the nonmagnetic sheet and magnetic control member assembly. FIG. 7 is a diagram showing force versus stroke in a solenoid valve type device. FIG. 8 is a diagram showing the linear output of the present invention; FIG. 9 is a diagram plotting empirical data of pressure difference as a function of current. FIG. 10 is a diagram showing the effect of temperature on the operation of the present invention. FIG. 11 is an enlarged sectional view showing a modified example of a sleeve made of a single member, ie, a combination of a reference member and a non-magnetic sheet. FIG. 12 is an enlarged sectional view showing a modified example of a combination of a non-magnetic sheet and a bobbin made of a single member 9. FIG. 13 is a vertical cross-sectional view of a modified embodiment of the proportionally actuated solenoid valve assembly of the present invention. 10...Solenoid valve assembly 12...Diaphragm operating valve 13...Top part 14...Outside member, that is, mounting bracket 15.
...Bottom part 16...Central member, that is, magnetic core pole piece 1
8... Electric winding 20... Non-magnetic sheet 22... Magnetic closing member 23... Base member 24... Hole 26... Entrance boat 28... Outlet port 30.244...Reference member or sleeve 32.
...Bobbin 40...Top member, that is, washer retainer-1
52...Power supply source 200.202...Diaphragm 300...Vacuum source 301...Vacuum actuated motor or vacuum actuated device 304...Pressure actuated device Patent Applicant Borda Warner corporation city otoshi j3

Claims (1)

Claims: (1) an outer member (14) of magnetic material having a top (13) and a bottom (15); and an outer member (14) of magnetic material mounted near the top (13) of said outer member (14). a top member (40); and a top member (40);
0) and located generally within said outer member (14), having a hole (24) with a fluid receiving port (26) and an outlet boat (28);
) and a non-magnetic sea located in the mb of said exit boat (2g) and extending beyond said central member (16) (2
0); a pace member (23) attached to the bottom (15) of the outer member (14) and forming a chamber (118) adjacent to the non-magnetic seat (20); (28) an exit bow of the central member (16) disposed within to form at least one opening (122); a magnetic closure member (22) adapted to complete a magnetic circuit by forming an air gap therebetween; and means (1) for generating a flow of magnetic flux through said magnetic circuit.
8), wherein the relative positions of the central member (16) and the closure member (22) are adjustable such that the outlet bow of the central member (16) (28)
) can be positioned close to or at a distance from the closure member (22), thereby adjusting said air gap to adjust the closure member (22) for a given level of magnetic flux in the magnetic circuit.
22) the non-magnetic seam as a function of the air gap and the pressure difference between the chamber (118) and the hole (24);
(20) A solenoid valve assembly characterized in that it is pushed in the opposite direction. (2) a cylindrical reference member (30) of magnetic material disposed about said central member (16) to increase the magnetic circuit, said means for generating a flow of magnetic flux comprising an electrical winding (
4s) and a bobbin (32) substantially surrounding the reference member (30) and substantially surrounding the electrical winding (18).
) A solenoid valve assembly according to claim (1). (3) The pace member (23) and the magnetic closure member (22)
A solenoid valve assembly as claimed in claim 1, including a spring (124) disposed between the magnetic closure member (22) and the non-magnetic seam (20). (4) The pace member (23) has an approximately small surface area (1
27), wherein said spring (124) is disposed about said cylindrical portion (128), and said small surface area (127) is connected to said magnetic closure member. (22) A solenoid valve assembly according to claim (3) adapted to assist in positioning. (5) The closing member (22) is connected to the non-magnetic sheet (2
0) A solenoid valve assembly according to claim 1, wherein the solenoid valve assembly is made of a very hard and rigid material. (6) the central member (16) is slidable within the reference member (30) and the non-magnetic seam (20) to adjust the size of the air gap; the closure member (
22) A solenoid valve assembly according to claim 2, wherein the solenoid valve assembly is adapted to adjust the level of pressure difference between the chamber and the hole in the central member for actuating the valve. (7) the non-magnetic seam) (20) and the closing member (22)
The distance between the two is approximately 0.038■ (approximately 0.00
15 inches).The solenoid valve assembly according to claim (1). (8) The solenoid valve assembly according to claim (1), wherein the non-magnetic seat (20) is made of brass. (9) An electromagnetic device according to claim 1, wherein the closure member (22) operates as a function of the level of magnetic flux at any pressure difference between the chamber (118) and the hole (24). valve assembly. 0I An electromagnetic device according to claim 1, comprising means (120) for pushing said magnetic closure member (22) towards said reference position to keep it in close proximity to said non-magnetic seat (20). valve assembly. αυ The non-magnetic sheet (20) is slightly deformed and the shape matches the hard magnetic closing member (22), resulting in the non-magnetic sheet)
A solenoid valve assembly according to claim 1'(5), wherein the solenoid valve assembly is of a hardness to further improve the closure between the mating surfaces of the magnetic closure member (20) and the magnetic closure member (22). (13) A solenoid valve assembly according to claim (1), which is adapted to cooperate with the diaphragm-operated valve assembly (12) to control the level of vacuum supplied to the vacuum-operated device (301). The central member (16) is adjusted to a fixed position to maintain a given magnetic flux density while being supplied with a reference current, thereby opening the chamber (118) and the hole (24) in the central member.
) The solenoid valve assembly according to claim 6 is adapted to operate the magnetic closure member (22) to maintain at least one given level of pressure difference between Three-dimensional. 04) The magnetic central member (16) is connected to the reference member (30).
) The solenoid valve assembly according to claim 13, wherein the solenoid valve assembly is fixed in a predetermined position relative to the valve. (+51) The electromagnetic valve assembly according to claim (1), which is connectable to a power supply source (152) that is a direct current power supply. A solenoid valve assembly according to claim 15, wherein said power supply source (152) is a pulse width modified generator. The mass of the member (22), the air gap, the diameter of the non-magnetic sheet and the magnetic flux density are calibrated to modify the specific pressure difference between the hole (24) in the central member and the chamber (118). A solenoid valve assembly according to claim (13).(19 the non-magnetic seam) (20) surface area (127)
A solenoid valve assembly according to claim 1, wherein the surfaces of the magnetic closing member (22) and the magnetic closing member (22) are arranged to have mutually opposite effects on the response speed of the closing member (22). (2G said inlet bow) A restriction part (303) is disposed within the hole (24) of said central member adjacent to (26);
Connecting means (302) connect said hole (24) to said restriction portion (3).
03) and the outlet bow) (28) in communication with the pressure actuated device (304).
) The solenoid valve assembly described in section 2. (21) The level of magnetic flux is a function of the input current to the electrical winding (18).
) The solenoid valve assembly described in section 2. (22 the closing member (22) is the non-magnetic seam)
The hole (24) and the chamber (118) are pressed into contact with the hole (20).
2. A solenoid valve assembly as claimed in claim 2, wherein the pressure difference between the electrical windings (118) is a function of the input current to the electrical winding (118). +23 the reference member (30) and the non-magnetic sheet)
The solenoid valve assembly according to claim 2, wherein (20) is a single member (231) made of a non-magnetic material. ■Claim No. (23), wherein the single member (231) is made of a thin-walled non-magnetic pipe material that is drawn.
Solenoid valve assembly as described in section. (c) The bobbin (32) and the non-magnetic seam) (20
2. A solenoid valve assembly according to claim 2, wherein the solenoid valve assembly (231) is a single member (231) of non-magnetic material. ■ The bobbin (32) forms a lower surface (404) in contact with the chamber (118), and the magnetic closure member (22)
the lower surface (404) of said bobbin and the magnetic closure member (22) in such a way as to push it away from the non-magnetic sheath (20)
2. A solenoid valve assembly as claimed in claim 2, including a spring (402) disposed between the springs (402). (27) The spring (402) is adapted to hold the closing member (22) in a reference position with respect to an axis perpendicular to the hole (24) q). Solenoid valve assembly.