JP2761424B2 - Electric actuated valve and its assembly process - Google Patents

Description

The present invention relates to at least one electromagnet having a plunger-type core and a freely movable movable between two opposing valve seats in a cavity. A valve member, the two valve seats surrounding corresponding orifices of two first fluid conduits, the cavity also communicating with a third fluid conduit, and further comprising an electromagnet. Means for closing one or other of the orifices by a valve member depending on the position of the core and fixed to the plunger-type core, and the cavity is provided with a lid operable from outside the valve. Electrical actuated valve.

[Conventional technology]

Electric actuated valves of this type are known and are available on the market. The drawback of these electrically actuated valves is that they generally require relatively high manufacturing costs for a given level of performance, especially due to the need for tight manufacturing tolerances and fine adjustments. have.

[Problems to be solved by the invention]

It is an object of the invention, inter alia, to provide an electrically actuated valve that can be adjusted relatively simply and reliably.
This adjustment is suitable for automation and also reduces costs by reducing the required level of dimensional tolerances when manufacturing the various components that make up the electrically actuated valve.

[Means for solving the problem]

In order to achieve this object, the electric actuated valve according to the present invention is characterized in that each of the two valve seats is arranged such that the position of the valve seat can be adjusted with respect to the moving direction of the valve member when assembling the valve. I have.

The plunger-type core is coupled to thrust means arranged to act on the valve member, the coil comprising an essentially cylindrical coil of electromagnet and a frame having an abutment surface for the plunger-type core. Preferably, the first valve seat of the group of valve seats is formed by a tubular portion, the tubular portion being pressurized into a housing provided in the wall of the cavity containing the valve member. Installed According to a preferred embodiment, the second valve seat of the group of valve seats is formed by or is integral with the lid for the cavity containing the valve member. The invention is particularly directed to a valve member, wherein the first spring is arranged to move the plunger core away from the abutment surface, and wherein the second spring generates a force less than the force of the first spring. Is applied to an electrically actuated valve arranged to move in a direction away from the second valve seat. The invention is particularly directed to a ring or disc made of a material that is made of a material that is slightly deformable with respect to the first valve seat and that is made of a material that is harder than the material of the valve member.
The present invention is applied to an electrically operated valve installed on the valve member between the valve member and the thrust means.

Furthermore, the present invention also relates to a step of assembling an electromagnet having thrust means fixed or non-fixed to a plunger-type core to one or more parts forming the cavity, and Introducing the tubular portion forming the first valve seat into the housing until the position of the first valve seat is reached; positioning the valve member and the second spring in place in the cavity; Gradually introducing the lid into the cavity until a predetermined distance from the first valve seat is reached.

According to a preferred form of this assembling step, said tubular part is introduced into its housing with a tool, said tool comprising a centering stud, said tubular part being mounted on a first supporting reference surface. Mounted on the centering stud so that the tool further comprises a shoulder forming a second reference surface, the shoulder being arranged to push back the thrust means, wherein the plunger core is The tool is advanced until it comes into contact with the abutment surface, and thus the distance between the reference surfaces determines the final position of the tubular portion. In the situation where a ring or disc is provided on the valve member, this ring or disc is placed on the shoulder of the tool.

According to a particular embodiment of this assembly process, the lid is supplied while supplying fluid to one of the fluid conduits and measuring the flow and / or pressure of the fluid in at least another conduit of said fluid conduits. Part is introduced into the cavity,
The forward movement of the lid is stopped when one or more measured values reach a predetermined threshold value or fall within a range defined by the limit value. Preferably, the electromagnet is energized during the operation of placing the tubular part in place and / or during the operation of placing the lid in place.

According to an alternative form of this assembling step, the spring force of the first spring causes the position farthest from the contact surface to be captured by the plunger-type core, and then the excitation corresponding to the minimum value for operating the electrically operated valve. After supplying energy to the electromagnet and supplying fluid to one of the fluid conduits, the lid is introduced into the cavity, and the forward movement of the lid is stopped at the moment when the magnetic core is attracted.

Other features and advantages of the present invention will become more apparent from the embodiments described below and illustrated in the accompanying drawings.

〔Example〕

FIGS. 1 and 2 show an electric actuated valve generally designated by the reference numeral 1.
Is formed by coupling the electric control system block 23 with the fluid system block 2 having the actual valve assembly. The two electric control system block portions 23 and the fluid system block portion 2 are fixed to each other by pins 24 and 25, and the assembly is connected to a control circuit (not shown) by electric terminals 26 and 28, and It is fixed along one surface of the surface group 9 of the assembly by screws 27 and 37 to one device indicated by a broken line 30 in the figure.

The electric control system block unit 23 includes the electromagnet 14, and the electromagnet 14 is disposed by being formed at a predetermined position in the electric control system block unit 23, and is provided with a cylindrical extension 17a. Possible frame 17 and coil carrier 1
And a coil 16 wound around 6a. The coil carrying member 16a has a central passage for accommodating a tubular non-magnetizable liner portion 22 for guiding the magnetizable movable core 12. Surface or abutment surface 38 of extension 17a of frame 17
A first spring 18 is positioned within the core 12 to move the core 12 away from the core 12 so as to move the core 12 to the rest position when no current flows through the coil 16. An end 22 a of the liner 22 protrudes beyond a fixing surface 31 of the electric control system block 23, and the fixing surface 31 contacts the surface 32 of the fluid system block 2. Extension 17a of frame 17
The end 12a of the magnetic core 12, which is located on the opposite side, contains a thrust member or thrust means 33 made of plastics material, this thrust member 33 comprising a bifurcation or limb represented by reference numerals 10 and 11. . Thrust member 33
May or may not be integral with the magnetic core 12.

The fluid block 2 has a cavity 13 in which the electrically actuated valve assembly is closed by a lid 20 after the free valve member 3 formed by a cylindrical part made of an elastomeric material is received therein. Is done. The valve member 3 is movable over a short distance in the axial direction of the valve member 3 between two oppositely arranged valve seats 4 and 5 in the cavity 13. The valve seats 4 and 5 are provided with orifices of respective conduits, one of which communicates with a discharge duct 6 designated by reference E, while the other conduit is connected to a pressure supply duct 8 designated by reference P. Communicating. The two discharge ducts 6 and the pressure supply duct 8 open on the same surface 9 of the fluid block 2. A third duct 7, which constitutes an output duct represented by the reference S, also connects the cavity 13 to the surface 9. The second spring 15 is carried by the lid 20 and the valve member 3, and attempts to move the valve member 3 to a position where the orifice of the first valve seat 4 is closed with a force smaller than the force of the first spring 18. On the side opposite to the side on which the second spring 15 is carried, the valve member 3 carries a thin disk or ring 19 made of a non-magnetic material.

The first valve seat 4 is formed by an end separately added to the tubular portion 4a, which is fitted in a cylindrical housing 39 in the fluid block 2. The second valve seat 5 is formed by a central portion of the lid 20 and is disposed substantially coaxially with the first valve seat 4.

Two fluid system block units 2 and an electric control system block unit 23
When they are attached to each other, the forked limbs 10 and 11 forming the thrust means 33 penetrate into the passages 34 and 35,
It then extends into the cavity 13 through both sides of the discharge duct 6 and further to the ring 19, where the thrust generated by the first spring 18 is applied to the ring 19. This thrust force has such a value that the valve member 3 can abut on the second valve seat 5 while slightly compressing the second spring 15 when the electromagnet 14 is not excited. When the electromagnet 14 is excited by applying a current, the magnetic core 12 is attracted toward the extension 17a and is carried by the extension 17a, whereby the first spring 18 is compressed. During the operation of this operation, the pressure in the pressure supply duct 8 is added to the spring force of the second spring 15, which causes the valve member 3 to move toward the orifice of the first valve seat 4 and consequently 1st valve seat 4
Orifice is closed.

Therefore, the rest state in which the discharge duct 6 and the third duct 7 communicate with each other and the operation state in which the third duct 7 and the pressure supply duct 8 communicate with each other are clearly separated.

 The electric actuated valve 1 is assembled as follows.

First, the electric control system block 23 is connected to the fluid system block 2.
Is fixed to the main body. At this time, the electric control system block 23
Is completely assembled and no adjustment is made as to the relative positions of its various components. Fixed surface
31 is at some non-adjustable distance to the abutment surface for core 12, which includes normal production tolerances.

On the other hand, at this point in the assembly procedure, the fluid block 2 has not yet been fitted with the tubular portion 4a, the valve member 3, the ring 19 and the lid 20, so that the cavity 13 is now open.

Two fluid system block units 2 and an electric control system block unit 23
Are aligned, the axial alignment between the axis XX 'of the magnetic core 12 and the axis YY' on which the valve member 3 moves is, on the one hand, a lateral projection provided on one of the blocks. (Not shown) can be achieved by engaging both a recess or an opening (not shown) formed in the other block portion and the fixing pins 24 and 25 penetrating the assembly element group. On the other hand, this is achieved by the end 22a of the tubular liner portion 22 penetrating into the bore 36 in the fluid system block portion 2. Each of the end 22a and the bore 36 is dimensioned such that the annular seal 21 undergoes radial compression in this position, thereby ensuring that the device is in particular with respect to the interior of the fluid block 2. Become sealed.

After the electric control system block unit 23 and the fluid system block unit 2 are fixed to each other, the rod or bar 40 shown in FIG.
By means of the tool formed by the tubular part 4a the housing
It is installed in a predetermined position in 39. The rod or bar 40 is
A cylindrical centering lug or centering stud 41 on which the tubular portion 4a is arranged, and a supporting surface or first supporting reference surface for supporting the end of the tubular portion 4a forming the first valve seat 4; 41a. Further, the rod or bar 40 has an annular shoulder 42 whose plane is perpendicular to the axis of the centering lug or centering stud 41, and
A disk or ring 19 is placed on 42.

Before starting the operation of inserting the tubular portion 4a into the housing 39, the fork portions 10 and 11 of the core 12 and thus of the thrust means 33 are arranged at a position furthest away from the surface 38 by the force of the first spring 18. I have.

When the tubular portion 4a is inserted into the housing 39 by means of a pressure fit in the direction of the arrow F in FIG.
The ring 19 supported by the shoulder 42 pushes the forks 10 and 11 and thus the core 12 back against the force of the first spring 18 until it is carried by

The rod or bar 40 is then withdrawn and the valve member 3 provided with the ring 19 is then closed with the lid with the second spring 15.
The cover 20 is set in a predetermined position together with the
It is engaged into 13a and gradually advanced. 1st valve seat 4
The forward movement of the lid portion 20 is continued until the distance between the valve member 3 and the second valve seat 5 becomes the movement stroke length of the valve member 3 required for opening the valve in view of the effective thickness of the valve member 3. It is continued.

In a first embodiment of the process for adjusting the position of the second valve seat 5, the coil 16 is energized before the adjustment operation and the core 12 is in its raised position, i.e. the position in contact with the surface 38. Next, the required travel distance of the valve member 3 is determined between the discharge duct 6 and the third duct 7 or the pressure supply duct 8 and the third
It can be detected by measuring the pressure or flow rate of the fluid flowing between the ducts 7. The forward movement of the lid 20 is stopped at the moment when the pressure value or the flow value of the fluid reaches a given threshold value or falls within a selection range defined by the limit value.

An alternative form of this process also involves observing the operation of electromagnet 14 at a voltage relative to its operating voltage. To this end, after the forks 10 and 11 have been moved as far as possible from the surface 38 by the first spring 18 without the valve member 3,
The lowest allowable operating voltage related to the temperature of the coil 16 is applied to the coil 16. Depending on whether it is operated with a cold coil or a hot coil, for example, a nominal voltage of 0.
A voltage corresponding to 7 times or 0.9 times is applied. If the power supply provides AC or rectification, the least desirable waveform will be selected. In other words, the electromagnet 14
Is placed in the minimum energized state that can operate the valve during its operation. When the forks 10 and 11 are at their lowest position, i.e., when the core 12 is furthest away from the surface 38, this minimum excitation state is not sufficient to move the core 12. .

By placing the lid 20 in place, the second valve seat 5 is first carried by the valve member 3, and then the valve member 3 having the ring 19 is carried by the forked portions 10 and 11. So that the passage of fluid having a calibrated or standardized pressure supplied by the pressure supply duct 8 is obstructed. When the lid portion 20 is gradually driven to a predetermined position, the air gap between the extension portion 17a and the magnetic core 12 moves the magnetic core 12, and the valve member 3 carrying the ring 19 applies the spring force of the second spring 15. The ring 19 pushes the forks 10 and 11 back in the direction indicated by the arrow F until the moment when it reaches a value at which the first valve seat 4 can be closed.

The position of the component group where this suction effect occurs corresponds to the required position of the second valve seat 5 with respect to the first valve seat 4 taking into account the effective thickness of the valve member 3 and the ring 19. This position is due to pressure fluctuations at the downstream position or the second valve seat 5.
Is detected by observing fluctuations in the flow rate through the orifice. In a situation where the flow rate is deviated, i.e., a situation where the flow rate measured at the moment when the magnetic core 12 is attracted is larger than the aforementioned value, the lid 20 is adjusted to adjust the flow rate to a specific value. It can be moved a little further.

The indirect adjustment of the respective positions of the first and second valve seats 4 and 5 according to the invention includes the effective dimensions of the functional elements concerned, in particular the effective thickness dimensions of the valve member 3 and the ring 19. ing. 3, the thickness of the ring 19 already plays a role in the positioning operation of the tubular part 4a. In this connection, it is noted that the final position of the valve member 3 at which the orifice of the tubular portion 4a is completely closed and closed by the valve member 3 is defined by the shoulder 42 of the tool 40 and the support surface 41a. It should be noted. When the valve member 3 moves in the direction indicated by the arrow F and the center thereof contacts the first valve seat 4, the thrust means 33
The height of each of the shoulder 42 and the support surface 41a is selected such that a certain gap remains between the bifurcated limbs 10 and 11 and the ring 19. When the valve member 3 comes into contact with the first valve seat 4 during the operation of the electric actuated valve 1, this gap causes a slight elastic deformation of the central part of the valve member 3, so that a good closing of the valve is achieved. The orifice of the tubular portion 4a is closed while ensuring the sealing effect.

From the above, it can be seen that the arrangement of the electric actuated valve 1 according to the present invention makes it possible to carry out an adjustment step suitable for complete automation. This process is relatively simple, and the adjustment operation is performed only by the fluid block 2 after the fluid block 2 is attached to the electric control block 23. As a result, the electrically actuated valve 1 is characterized by a high degree of reliability, in particular due to the fact that its adjustment procedure has to do with the effective dimensions of the functional elements, and that the elements require tight dimensional tolerances. The cost associated with manufacturing the component group is reduced.

[Brief description of the drawings]

1 is a partial cross-sectional view of one embodiment of an electric actuated valve according to the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. FIG. 2 is a cross-sectional view similar to FIG. 1 showing one stage in an assembling process. 3 ... valve member, 4 ... first valve seat, 4a ... tubular part, 5
… Second valve seat, 6… discharge duct, 7… third duct, 8… pressure supply duct, 10, 11… bifurcation (limb), 12… magnetic core, 13… Cavity, 14 ... electromagnet, 15 ...
Second spring, 16: coil, 17: frame, 18: first spring, 19: ring (disc), 20: lid, 33: thrust member (thrust means), 38: Surface (contact surface), 39 ... Housing, 40 ... Tool (rod, bar), 41 ... Centering lug (Centering stud), 41a ...
Support surface (first support reference surface), 42 ... shoulder.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor André Tomas, France, 27120 Urbec-Coche-ler-ru-de-la-Chapelle (no address) (56) References JP-A-55-94075 (JP, A) -42704 (JP, Y2) Jikken 63-1097 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16K 31/06 305 F16K 11/04-11/044

Claims (11)

(57) [Claims] 1. An electrically actuated valve comprising at least one electromagnet (14) having a plunger core (12) and two opposed valve seats (13) in a cavity (13). A free valve member (3) movable between 4,5);
The two valve seats surround the corresponding orifices of two first fluid conduits (6, 8), said cavity (13) also communicating with a third fluid conduit (7). , And an electromagnet (1
4) means (33) fixed to the plunger-type core (12) of (4) and for closing one or the other of the orifices by a valve member (3) depending on the position of the core (12); Lid that can be operated from outside the valve (2
In the electric actuated valve provided in the cavity (13), two valve seats (4, 5) are provided so that the position of the valve seat can be adjusted in the moving direction of the valve member (3) when assembling the valve. Each of which is disposed. 2. An electromagnet comprising: a coil having an essentially cylindrical shape; and a frame having an abutment surface for a plunger core. Thrust means (3) arranged to be able to act on the member (3)
In an electric actuated valve having a plunger type magnetic core connected to a plunger type magnetic core, a first valve seat (4) of the valve seat group is formed by a tubular portion (4a), and the tubular portion is a valve. 2. The electrically actuated valve according to claim 1, wherein the valve is mounted in a housing (39) provided in a wall of the cavity (13) containing the member by a pressure fit. 3. A second valve seat (5) of said group of valve seats is formed by a hollow lid (20) containing a valve member (3), The electrically operated valve according to claim 2, wherein the valve is fixed. The first spring (18) is provided with a plunger core (1).
A second spring (15), which is arranged to move 2) away from the abutment surface (38) and generates a force less than the force of the first spring, moves the valve member (3) to said position. 4. An electrically actuated valve according to claim 3, wherein the valve is arranged to be moved away from the second valve seat. 5. The valve member (3) is formed by a cylindrical portion made of a material that is slightly deformable with respect to the first valve seat (4), and is harder than the material of the valve member (3). 5. A ring or disc (19) made of the above is arranged on the valve member between the valve member and the thrust means (33).
The electrically operated valve as described. 6. An electromagnet (14) having thrust means (33, 10, 11) fixed to a plunger core (12),
The tubular part (4a) forming the first valve seat (4) is assembled to one or more parts forming the cavity (13) and the housing (39) is brought into position with respect to the abutment surface (38).
The valve member (3) and the second spring (1)
Place 5) in place in cavity (13) and
5. The electric system according to claim 4, wherein the lid (20) is gradually introduced into the cavity (13) until the valve seat (5) is at a desired distance from the first valve seat (4). Assembly process of operating valve. 7. The tubular part (4a) has a housing (3).
9) introduced into it by means of a tool (40), which is provided with a centering lug (41) and centered so that the tubular part rests on the first supporting reference surface (41a). Mounted on the lug, the tool (40) further comprises a shoulder (42) forming a second reference surface, the shoulder being arranged to push back the thrust means (33), the plunger core (12)
The tool (40) is advanced until it comes into contact with the abutment surface (38), so that the distance between the reference surfaces determines the final position of the tubular part (4a) 7. The assembly process according to claim 6, wherein: 8. The tool according to claim 1, wherein said ring or disc (19) is arranged on a shoulder (42) of said tool (40).
An assembling process according to claim 7 for an electrically operated valve according to claim 5. 9. Supplying fluid to one of the fluid conduits (6,7,8) and measuring the fluid flow and / or pressure in at least one other conduit of said fluid conduits. Said lid (20) is introduced into the cavity (13),
The forward movement of the lid (20) is stopped when one or more measured values reach a predetermined threshold value or fall within a range defined by the limit value. 9. The assembling step according to any one of 7 and 8. 10. The electromagnet (14) is excited during the operation of setting the tubular part (4a) in a predetermined position and / or during the operation of setting the lid (20) in a predetermined position. The assembly process according to any one of claims 7, 8, and 9, wherein: The spring force of the first spring (18) causes the plunger-type core (12) to assume a position having a maximum distance from the contact surface (38), and then a minimum for operating the electric actuation valve. Supply the excitation energy corresponding to the value to the electromagnet,
After supplying fluid to one of the fluid conduits, the lid (20) is introduced into the cavity (13) and the magnetic core (1) is introduced.
9. The assembling process according to claim 7, wherein the forward movement of the lid (20) is stopped at the moment when the suction action of (2) occurs.