JPS6030871B2 - Moving coil driven control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moving coil driven control valve, and particularly to a pilot type electromagnetic control valve.

Direct-acting solenoid valves and pilot-operated valves are known as solenoid valves used to control the flow rate of subordinate fluid piping.

Figure 1 shows a conventional direct-acting solenoid valve, where 1 is an outer yoke made of ferromagnetic material, 2 is an electromagnetic coil, 3 is a movable iron core and valve body made of ferromagnetic material, and 4 is an exciting CFF. The spring has the function of pressing the movable iron core 3 in one direction, and when the electromagnetic coil is excited, a magnetic flux shown by the dotted line in the figure is formed, which causes the movable iron ○ to be pulled up against the spring 4 and to close the gap. G disappears, the valve becomes open, and on the other hand, when the excitation of the electromagnetic coil is deenergized, the magnetic coupling force is eliminated and the spring 4
The valve is closed as shown.

30 is a valve body, and 31 is a partition wall that is integrally provided with the valve body and has a valve seat 32 at a predetermined position on its upper surface.

The force balance in the case of the valve structure shown in FIG. 1 is expressed as follows. That is, the upstream pressure of the fluid piping is P. , the downstream pressure is P2, and it is assumed that the upstream pressure P is also acting on the upper part of the movable iron 03.

Also P. The pressure-receiving area of the valve body on which P2 acts is S2, the pressure-receiving area of the valve body on which P2 acts is S2, and the spring pressing force when the valve is closed is FS.
If the increase in spring pressing force when the valve is open is FS2, then when the valve is closed it is FS, 10P. S. >P2S2.

On the other hand, at the time of the valve, the movable core attraction force due to electromagnet excitation is F
e, and assuming that downstream pressure P2 does not act on the movable iron core, when the valve is open, F8>FS, 10FS2, and at the moment the valve is closed, F8>FS, 10P. S. 1P2S2.

The structure shown in FIG. 1 has the following drawbacks. ■
Can only be used for ON-OFF control.

■ Since electromagnetic force is proportional to the number of turns of the coil and the current, there is a limit to the electromagnetic force itself, and as the gap gets larger, the electromagnetic force weakens, so it is limited to valves with small diameters.

■ Cannot be used when fluid pressure differential is large.

Figure 2 shows a conventional pilot-operated solenoid valve.
5 is a main valve body, 6 is a pilot orifice formed on the upstream side of the main valve body 5, 7 is a pilot port provided on the downstream side thereof, 33 is a movable iron core and pilot valve body, and 34 is a king valve seat. , in the valve closed state shown in the figure, the upstream pressure is P through the pilot orifice on the movable iron ○ side of the main valve body 5, and the pressing force of the main valve body 5 is (P.S. - P cross 2). (where S, S2 are the areas of the main valve body on which P and P2 act, respectively). When the electromagnetic coil is excited to open the valve and the movable iron ○ is pulled up, downstream pressure P2 is generated on the movable iron core side of the main valve body 5 through the pilot port 7, and a force ((P, (S, 1S3)-Pbu,)) (where S3 is the area of the outer diameter of the valve seat 34) occurs, and the valve opens.In this structure, the weak electromagnetic valve is Features include the ability to open and close the valve with force and the ability to use it for relatively large diameters. However, the structure shown in FIG. 2 has the following drawbacks.

■Only ON-OFF control operation.

■ Minimum of 0.5 kg/kg as the main internal valve is moved by differential pressure.
A certain degree of differential pressure is required.

■ Cannot be used for large diameters because it cannot detect large strokes.

This invention was devised by paying attention to the current state of conventional solenoid valves, and its purpose is to provide a solenoid valve that is capable of continuous control and that can be favorably used to control the flow rate of large-diameter pipes.

That is, the movable coil type control valve according to the present invention includes a guide pipe branched and erected on the upper surface of an annular valve body, a plunger slidably inserted into the guide pipe and provided with a pilot valve body at the lower end, and the above-mentioned. a movable coil unit that is movable up and down on the outer periphery of the guide tube and that supports the plunger and moves it up and down by its magnetic coupling force; and a cylindrical king valve body that is provided on the peripheral wall of the valve body so that it can pass through the guide tube. a partition wall formed inside the valve body integrally with the valve body and having a valve seat for the main valve element at a predetermined position below corresponding to the port surface; It is slidably housed in an iron bag, has a pilot valve seat at the above-mentioned predetermined position, has a pilot port that runs vertically on the axis, has a pilot orifice at a predetermined position on the outer circumference, and has a main valve on the lower circumference. and a main valve body having a main valve body.

In the above control valve, when the movable coil unit is raised with the main valve body closed, the plunger magnetically coupled to the coil unit is pulled up, and the pilot valve body at the lower end of the plunger moves into the pipe provided at the top of the main valve body. .

When the main valve leaves the valve seat, downstream pressure is generated above the main valve through the pilot hole of the main valve, and the difference between the pressure and the upstream pressure causes the main valve to move upward and open the main valve. When the main valve body moves upward, the pilot valve seat provided on the top surface of the main valve body compresses the pilot valve body and closes the gyrot port, so the pressure above the king valve body returns to the upstream pressure. do. The present invention will be described in detail below with reference to FIGS. 3 to 10.

FIG. 3 shows a first embodiment of the present invention, in which reference numeral 35 denotes a valve body, and 36 denotes a partition formed integrally with the valve body 35 and provided with a valve seat 37 for the main valve element at a predetermined position. The wall 38 is a sliding surface for the main valve body 39 formed at a predetermined position on the peripheral wall of the valve body above the valve seat 37. The main valve body 39 is mounted inside the sliding surface 38 so as to be able to freely slide vertically, and this includes a pilot □4 with a predetermined inner diameter that passes through its axis in the vertical direction.
0, an annular pilot valve seat 18 formed protrudingly around the upper end of the pilot port, a main valve 41 formed on the lower outer periphery so as to be able to sit freely on the valve seat 37 for the main valve element, and one end of which A pilot orifice 42 opens at a predetermined position on the outer circumferential side of the upper end of the main valve body 39, and the lower end thereof is closed on the upstream side of the main valve body.
It is composed of. Reference numeral 8 denotes a thin-walled guide tube made of a non-magnetic material and having the same inner diameter as the lighting surface, which is installed upright on the upper surface of the periphery of the upper surface of the valve body 35, and the guide tube 8 and the main body are located at the center of the valve body 35. A plunger guide shaft 15 is provided that passes through the pilot port 40 of the valve body 39 in a non-contact manner and has both ends pivotally supported by bearings 43 and 44 provided on the guide tube upper end flange portion 8' and the lower surface of the valve body, respectively. has been done.

45 is equipped with an upper test guide shaft through hole at the center of the vehicle, and a guide pipe 8
A plunger made of ferromagnetic material is slidably inserted into the plunger, and a pilot valve iron fitting holding part 16 is provided at the lower end of the plunger via a connecting rod 19. The outer peripheral protrusion of an annular pilot valve 17 having a hollow portion through which a guide shaft passes through a minute gap is iron-bonded to the pilot valve seat 18 of the main valve body 39 so that the lower surface of the valve body can be freely engaged with and detached from the pilot valve seat 18 of the main valve body 39. When seated, it forms a pilot valve.

In this case, the hollow inner wall of the pilot valve body 17 and the guide rod 15
The gap formed between the pilot valve and the peripheral wall is configured such that when the pilot valve is closed, the pilot valve body is pressed and the gap can be closed. 13 is a movable coil assembly drive device 46 disposed on the outer periphery of the upper end of the guide tube 8, and a drive device 1
3 is a movable coil assembly suspended via a feed screw 14 so as to be able to move up and down, and the outer periphery of the guide tube can be raised and lowered by rotating the feed screw 14 by an electric motor or manual motor (not shown) installed in the drive device. It is.

The movable coil assembly 46 is composed of an outer cylinder yoke 9 made of a ferromagnetic material, an electromagnetic coil 10 for upward attractive force, and an electromagnetic coil 12 for downward attractive force disposed inside the outer cylinder yoke 9, and is configured to open or close the valve. At this time, by exciting the electromagnetic coil 10 or 12, respectively, the plunger 45 is supported by the magnetic coupling force via the guide tube 8 and is caused to follow and move in the vertical direction.

In this case, the magnetomotive force, or current, of the electromagnetic coil for upward attraction is made larger than that of the electromagnetic coil for downward attraction, and control is performed to obtain a magnetic coupling force corresponding to the large load reaction force during upward movement. The plunger can be moved up and down without delay in following the coil assemble. Next, the operation of the control valve shown in Fig. 3 will be explained.
When the moving coil assembly 46 and the plunger 45 are raised from the lowest position, in other words, from the valve closed state, the plunger 45 rises and the pilot valve body 17 connected to the plunger 45 also rises.

As a result, downstream pressure P2 is generated above the main valve body 39 through the pilot port 40, and the main valve body 39 moves upward due to the differential pressure with the upstream pressure P, and the pilot valve seat 18 of the main valve body 39 By compressing the body 17 and closing the gap between the pilot valve body 17 and the plunger guide shaft 15, the pressure above the main valve body returns from P2 to P. In this way, the main valve body can be moved over an arbitrary stroke and the flow rate can be controlled continuously. 4 to 6 each show other examples of electromagnetic coil assemblies that can be used in the present invention, and the one in FIG. 4 is composed of an outer cylinder yoke 9 and an electromagnetic coil 10 for upward attractive force. The plunger 11 can be moved up and down by exciting the electromagnetic coil for upward attractive force and moving the movable coil assembly IJ46 up and down by the feeding mechanism.

Although the figure shows the position of the plunger during its ascent, in this structure, the plunger 11 descends at the dotted line position with respect to the moving coil assembly 46 when descending, resulting in a delay in the plunger following the electromagnet. The one shown in FIG. 5 is one in which electromagnetic coils 10 for upward attractive force are provided in two stages, upper and lower. It consists of electromagnetic coils 10 for upward attractive force installed on the upper and lower sides of the gap via magnetic material smoothers 47, and the position of one of the plungers 11 corresponding to the two upward electromagnetic coils is shown in Fig. 4. By adjusting the distance between both plungers so as to be at the position indicated by the broken line, the same function as the moving coil assembly shown in FIG. 3 can be provided.

Furthermore, the one in FIG. 6 shows a moving coil assembly 46 that is a combination of the ones in FIGS. 3 to 5, and includes three stages of electromagnetic coils for upward attraction and one stage for downward attraction. It is composed of

By appropriately combining the electromagnetic coils in this manner, the required upward attractive force and downward attractive force can be easily and reliably generated. FIG. 7 shows another embodiment of the invention, which includes the moving coil assembly 46 of FIG.
A coupling coil unit 49 consisting of a coupling electromagnetic coil 20 and a coupling outer cylinder yoke 21 made of ferromagnetic material is attached to the lower part of the plunger via a coupling rod 48. Each of the main valve bodies 39' is made of a ferromagnetic material.

In this structure, the moving coil assembly 4 can be placed at any position.
6 and the coupling coil unit 4 integrally connected thereto.
When 9 is moved, the plunger 45 and the pilot valve body 1
7 moves, and the main valve body 39' follows due to the pressure difference.At this time, by exciting the coupling coil unit 49, a magnetic coupling force is created between the pilot valve body mating portion 16' and the main valve body 39'. This prevents the main valve body 39' from following behind the pilot valve body 17 and prevents the main valve body 39' from wobbling in the positioning calendar, thereby significantly improving control accuracy. This has the advantage of being able to adjust the valve even at low flow rates and low differential pressures.
Furthermore, in this case, the valve can be manually adjusted by moving the moving coil assembly up and down next to the manual motor of the moving coil assembly drive device 13. FIG. 8 shows a structure in which the plunger guide shaft is omitted, in which a plunger valve body 22 is formed protruding from the center of the lower surface of the plunger 1, and the protruding tip portion of the pilot valve body 22 is connected to the main valve body 5.
It is configured to be seated in the concave pilot valve seat 51 formed at the upper end of the pilot port 40 of the F.

The functions of the langeer 11, main valve body 50, etc. are the same as those in FIG. 3. FIG. 9 shows still another example in which the plunger guide shaft of the present invention is not provided. 10. The electromagnetic coil 12 for downward attraction, the electromagnetic coil 20 for coupling, and the electromagnetic coil 12 for downward attraction and the electromagnetic coil 20 for coupling.
It consists of a magnetic gap 23 interposed between
Further, the pilot valve body 24 and the main valve body 39'', which are provided at the lower part of the plunger 1 via a connecting member 53, are each made of a ferromagnetic material, and the coupling electromagnetic coil 20 is excited as in the case of FIG. As a result, the pilot valve body 24 and the main valve body 39'' are magnetically coupled, improving the followability and localization accuracy of the main valve body 39'', and making it possible to adjust the valve when the flow rate is low and the differential pressure is low.

FIG. 10 shows a structure in which a permanent magnet 25 is built into the pilot valve body 24' instead of providing a coupling force electromagnetic coil as in the case of FIGS. 7 and 9. When the movable coil unit is raised, The plunger magnetically coupled to the coil unit follows and rises, and the pilot valve body 24' containing the permanent magnet 25 is separated from the main valve body 39''.

As a result, downstream pressure is generated on the main valve body side through the pilot port 40, and the difference between the pressure and the upstream pressure pushes the main valve body upward. Since this invention is configured as described above, the main valve body can be moved over an arbitrary stroke, so that continuous flow control is possible, and there is also a delay in the main valve body following the pilot valve body provided at the bottom of the plunger, and the main valve in the fixed position layer. Body wobbling can be reliably prevented and flow rate control can be performed with high control accuracy.

Further, according to this invention, the necessary upward and downward suction forces can be easily obtained, so it can be well applied to flow rate control of large-mouthed pipes, and the valve can be easily adjusted even at low flow rates and low differential pressures. It has the following advantages.

[Brief explanation of the drawing]

Figures 1 and 2 are longitudinal cross-sectional views showing conventional solenoid valves, and Figure 3 is a longitudinal sectional view showing a conventional solenoid valve.
The figure is a longitudinal sectional view showing an example of the present invention, FIGS. 4 to 6 are schematic longitudinal sectional views illustrating a moving coil unit used in the present invention, and FIGS. FIG. 7 is a vertical cross-sectional view of a main part showing another example. 1, 9, 21: Outer cylinder yoke, 2: Electromagnetic coil, 3: Movable iron core valve body, 4: Spring, 5, 39, 39', 39'', 5
0: Main valve body, 6, 42: Pilot orifice, 7, 4
0: Pilot port, 8: Guide tube, 10: Electromagnetic coil for upward suction force, 11, 45: Plunger, 12: Electromagnetic coil for downward suction force, 13: Moving coil assembly drive device, 14: Feed screw, 15: Guide Shaft, 16, 16': Pilot valve group joint holding part, 17, 24, 24', 33: Pilot valve body, 18, 51: Pilot valve seat, 20: Coupling electromagnetic coil, 23: Magnetic gap, 25: Permanent Magnet, 30, 35: Valve body, 31, 36: Partition wall, 34: Valve seat for main valve element, 37: Valve seat for main valve element, 38: Sliding surface, 41
: Main valve, 46, 52: Moving coil assembly, 47: Magnetic material smoother, 49: Coupling coil unit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Scope of Claims] 1. A guide pipe branched and erected on the upper surface of an annular valve body, a plunger slidably inserted into each guide pipe and equipped with a pilot valve body at its lower end, and a plunger that moves up and down on the outer periphery of the guide pipe. a movable coil unit that is freely provided and supports the plunger and moves it up and down by its magnetic coupling force; a cylindrical main valve body sliding surface that is provided on the peripheral wall of the valve body so as to communicate with the guide pipe; a partition wall formed integrally with the valve body inside the valve body and having a valve seat for the main valve element at a predetermined lower position corresponding to the sliding surface; and a partition wall that is slidably fitted into the sliding surface. and a main valve body having a pilot valve seat at a predetermined position on the upper end, a pilot port communicating vertically with the axis, a pilot orifice at a predetermined position on the outer periphery, and a main valve on the lower periphery. A moving coil driven control valve. 2. One or two moving coil units are arranged above and below in the outer yoke via spacers made of non-magnetic material.
1 or more electromagnetic coils for upward attractive force;
2. The moving coil driven control valve according to claim 1, wherein the moving coil assembly includes one or more downward attractive force electromagnetic coils. 3. The pilot valve body is formed to project downwardly from the center of the lower surface of the plunger, and the pilot valve seat is formed by an inner peripheral surface of a concave portion communicating with the upper end of the pilot port, so that the pilot valve body is fitted into and seated in the valve seat. A moving coil driven control valve according to claim 1, characterized in that the control valve comprises: 4. The moving coil drive type according to claim 1, wherein the moving coil unit includes a coupling coil unit at the lower part of the outer cylinder yoke, and the main valve body and the pilot valve body are each made of a ferromagnetic material. control valve. 5. The moving coil driven control valve according to claim 1, wherein the pilot valve body is provided with a permanent magnet therein, and the main valve body is made of a ferromagnetic material. 6. The plunger and the pilot valve body are each provided with a through hole that passes through the axis and communicates in the vertical direction, and a guide shaft that passes through the axis of the guide tube and extends in the vertical direction is provided in each of the through holes and the pilot port of the main valve body. 2. The movable coil driven control valve according to claim 1, wherein the pilot valve seat and the pilot valve body are each formed of an annular body.