JPS63312586A - Flow control valve - Google Patents

Abstract

PURPOSE:To continuously make voltage and opening of a valve proportional to each other by providing a fixed resistance plate between a moving core and a fixed core and mounting a moving resistance plate for regulating the motion of the moving core at the end portion of the moving core. CONSTITUTION:A fixed resistance plate 19 for preventing sudden adsorption of a moving core 20 to a fixed core 17 is disposed between the moving core 20 and the fixed core 17. A moving resistance plate 21 for regulating the motion of the moving core 20 in the vicinity of the terminal end of a stroke for approaching the moving core 20 to the fixed core 17 is provided at the end portion of the moving core 20 on the opposite side to the fixed core 17. When voltage is increased, the moving core 20 approaches the fixed resistance plate 19 and force acting on the moving core 20 is rapidly increased, the moving resistance plate 21 is hard to be flexed to regulate a sudden displacement of the moving core 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a liquid flow rate control valve using a solenoid, and can be used, for example, to control the fuel flow rate in a boiler or the like.

[Conventional technology]

BACKGROUND ART In controlling the flow rate of liquid fuel for the purpose of temperature adjustment in boilers and the like, a method has been used in which, for example, a worker manually operates a needle valve while monitoring the temperature of the boiler. In addition, as shown in Fig. 5, multiple valves V that can be opened and closed by pulse signals are connected in parallel in the middle of the fuel pipe, and the opening and closing of each valve V is combined with electrical operation. A multi-stage switching valve system was also used to adjust the flow rate.

[Problem that the invention seeks to solve]

According to the conventional method described above, there was a problem in that the adjustment range of the flow rate was generally narrow, and the pressure of the fluid changed as the flow rate changed. In particular, the multi-stage switching valve system was configured to automatically control the fuel flow rate according to the boiler temperature because it could be electrically switched, but each valve V was fully controlled on and off. Adjustment of the flow rate had to be done in stages, and fine-grained control was not possible. Another problem was that troubles were likely to occur in the opening and closing portions of each valve V.

[Purpose of the invention]

A flow control valve that uses a solenoid, which can continuously make the voltage applied to the solenoid proportional to the opening of the valve, and can control the flow rate of liquid while keeping the pressure almost constant over a wide adjustment range. The purpose is to provide a flow control valve.

[F-stage to solve problems]

The mul IN valve of the present invention includes a coil, a fixed core provided at one end of the coil, and a moving core that moves within the coil by a magnetic field generated by the coil, and by changing the voltage applied to the coil. In a flow control valve that controls the flow rate of liquid by opening and closing a liquid flow path using a sheet member provided on the moving core, a fixed resistor is installed between the moving core and the fixed core to prevent the moving core from suddenly adhering to the fixed core. A plate is provided, and a moving resistance plate is provided at the end of the moving core opposite to the fixed core to regulate the movement of the moving core near the end of the stroke where the moving core approaches the fixed core. It is a feature.

(Function) Generally, when the voltage applied to the coil is increased to move the movable core toward the fixed core, when the movable core approaches the fixed core, the force moving the movable core increases rapidly in response to the increase in voltage. However, in the present invention, most of the area where the force acting on the moving core rapidly increases is excluded from the movable stroke of the moving core by the fixed resistance plate provided between the moving core and the fixed core. Strong magnetism will no longer occur. Further, the moving resistance plate is deflected by the movement of the moving core toward the fixed core, but the larger the amount of deflection, the more difficult the moving resistance plate is to deflect. In other words, when the voltage is low, the movable resistor plate easily bends, but as the voltage increases, the movable core approaches the fixed resistor plate.
At a point where the force acting on the moving core begins to increase rapidly, the moving resistance plate becomes difficult to bend and restricts rapid displacement of the moving core. Therefore, the voltage applied to the coil and the displacement of the moving core, ie, the open/closed state of the valve, are approximately proportional.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

In the figure, 1 is the main body of the valve which is approximately cylindrical in shape. A needle screw hole la is formed in the center of the lower surface of the main body 1, and this hole 1a is connected to a hole 2 formed in the center of the F surface of the main body 1.
It communicates with the fourth stage als2.3 of the stage. A needle 4 having substantially the same shape as the hole 1a is inserted into the needle threaded hole 1a, and is connected to the main body weight of the valve at the threaded portion 4a. Three circumferential grooves 5.6.7 are formed on the side circumferential surface of the needle 4 that is in contact with the inner circumferential surface of the hole la. O-rings are interposed in the upper and lower circumferential grooves 5.7 to seal between the valve body 1 and the needle 4. A horizontal through hole 8 is formed and opened in the central circumferential groove 6, and in the center of the four through holes 8, the upper end of the needle 4 is opened and inserted into the four steps 3 of the main body 1. A straight oil passage hole 9 is in communication. Then, on the side peripheral surface of the valve body 1, a liquid body [11
0 and an outlet 11 are formed. The population lO is hole! 2
is opened on the inner peripheral surface of the needle screw hole 1a through ['1
and communicates with the central circumferential groove 6 of the needle 4. Further, the outlet 11 communicates with the four-step portion 3 of the main body 1 via a hole 13 formed perpendicularly to the side of the bottom surface of the lower recessed step portion 3.

Next, an impaction gland nut 14 is screwed into the recessed step 2 on the upper side of the main body l. grand nut 14
The retainer ring No. 15 of the moving resistance plate 21, which will be described later, is pressed and fixed to the engaging W step portion formed at the corner between the two concave step portions 2.3. And the outer and upper four steps 2 of the presser ring 15
An O-ring is interposed between the bottom surface of the main body 1 and the gland nut 14, and seals the inside of the recessed portions 2 and 3 of the main body 1 from the outside. The open lower end of a pipe 16 is fixed to the center of the gland nut 14. A fixed core 17 is fixed to hQ of the vibrator 16, and a threaded portion 18 is formed at the upper end of the fixed core 17, which projects upwardly outside the vibrator 16. In addition, a thin fixed resistance plate 19 made of a non-magnetic material is provided on the lower end surface of the fixed core 17 outside the vibrator 16, and a moving core 20 (described later) provided inside the pipe 16 is connected to the fixed core 17. This prevents sudden and strong magnetic attachment. The thickness of the fixed resistance plate 19 may be determined by taking into account the influence of the magnetic field applied to the moving core 20. For example, in this embodiment, the thickness is approximately the same as the actual movable length of the moving core 20, for example. It is approximately 0.5 mm. Another fixed resistance plate! 9
may be provided on the upper part of the moving core 20, which will be described later. and,
A cylindrical moving core 20 is provided inside the pipe 16 so as to be movable upward FIJ. A moving resistance plate 21 and a valve seat portion 22 as a seat member are attached to the lower end of the moving core 20 on the opposite side (lower side) of the fixed core 17. As shown in FIG. 2, the movement resistance plate has a large-diameter annular frame portion 23 and a small-diameter annular attachment portion 24, and a curved three-piece arm 25 connects both PIS 2.
It has a structure in which 3 and 24 are connected. The outer diameter of the annular frame portion 23 is set to be approximately the same as the inner diameter of the stepped portion formed on the lower surface of the presser ring 15. Also, the valve seat part 2
2, a mounting screw portion 27 is formed at one end of the base portion 26;
The base portion 26 has a structure in which a projection M28 for opening and closing the oil passage hole 9 of the needle 4 is formed at the lower end. The mounting screw part 27 of the butto seat part 22 is inserted into the annular mounting part 24 of the moving resistance plate 21 when the moving core 27 is inserted into the moving core 27.
The movable core 20, the movable resistance plate 21, and the valve seat portion 22 are integrally assembled. Then, when the moving core 20 is in the aF direction position, the protrusion 28
When the oil passage hole 9 is closed, the moving resistance plate 21 is in a state in which the annular frame portion 23 is brought into contact with the presser ring 15 from below. Therefore, when the movable core 20 is raised to open the oil passage hole 9 by the action of the coil 31, which will be described later, the movable resistance plate 21 is configured to bend in a convex shape in the F direction.

Next, on the upper surface of the main body l and the gland nut 14,
A ring core 29 is provided by extrapolating the pipe 16. Further, a bobbin 30 is provided on the ring core 29 by extrapolating the pipe 16. Coil 3 on bobbin 30
1 is provided, and the moving core 2o within the pipe 16 can be moved by the magnetic field generated by the coil 31. Further, a ring core 32 is provided on the bobbin 30 and is inserted through the threaded portion 18 of the fixed core 17. From F of the ring core 32, a coil case 33 that covers the bobbin 30, coil 31, etc.
is provided. The coil case 33 has a cylindrical shape with an open bottom, and the screw portion 18 of the fixed core 17 is inserted into a mounting hole provided in the center of the circular upper wall, so that the lower surface of the upper wall is tightly attached to one surface of the ring core 32. Screws als18 in the state
It is attached to the pipe 16 and the main body l side by screwing a nut 34 into the pipe 16 and the main body l side. Note that the coil case 3
A name plate 35 is provided between the upper wall of 3 and the nut 34.

Next, the operation of the flow control valve configured as described below will be explained.

First, when no voltage is applied to the coil 31, the current ■ is at its lowest point (
For example, the origin position of the valve seat portion 22 such as O) is detected. At this time, the protrusion 28 of the valve seat part 22 is connected to the valve seat part 22 and the moving core 2° and the moving resistance plate 2.
It is assumed that the oil passage hole 9 is closed with an elasticity of 1, and that the moving resistance plate 21 is located below the presser ring 15.

Here, when testing air at a predetermined pressure is supplied from the flow rate control valve SV's population 10, the air is supplied from the population 10, the central circumferential groove 6,
It enters the recessed step 3 of the main body 1 through the gap with the protrusion 28 through the ri passage hole 8 and the oil passage hole 9, and then comes out through the hole 13 and the outlet 11. Here, when the needle 4 is gradually tightened, the needle 4 rises toward the inside of the main body 1,
Gradually lift the valve seat section 22 and moving core 20.

As described in the explanation of the configuration, when the annular frame portion 23 of the moving resistance plate 21 abuts the retaining ring 15 from below, resistance is generated in the grip of the valve seat portion 22, and the protrusion 28 is moved to a predetermined position. Since the oil passage hole 9 is reliably closed with a force of 1, air at a predetermined pressure will not come out from the outlet 111.

Next, a control valve SV for the adjusted flow is provided in the middle of the piping system through which the liquid at a predetermined pressure flows, and the flow rate is controlled by adjusting the voltage applied to the coil 31. - Generally, when increasing the voltage applied to the coil to raise the moving core toward the fixed core, when the lift amount increases and the moving core approaches the fixed core, the force that moves the moving core against the increase in voltage increases. is expected to increase rapidly. However, in this embodiment, since the fixed resistance plate 19 made of a non-magnetic material is provided between the moving core 20 and the fixed core 17,
Most of the region where the force acting on the movable core 20 rapidly increases is excluded from the movable stroke of the movable core 20, thereby preventing the movable core 20 from suddenly becoming strongly magnetized to the fixed core 17 and becoming magnetized. In addition, the moving core 20 toward the fixed core 17
The movement of the moving resistance plate 21 causes deflection, but
The larger the amount of deflection, the more difficult the moving resistance plate 21 is to deflect. In other words, when the voltage is low and the lift of the moving core 20 is small, the moving resistance plate 21 is relatively deflected to w1@, but as the voltage increases and the moving core 20 approaches the fixed resistance plate 19, the force acting on the moving core 20 increases. When the displacement begins to increase rapidly, the movable resistance plate 21 becomes difficult to bend, thereby regulating the rapid displacement of the movable core 20.

Therefore, as shown in FIG. 3, the relationship between the voltage applied to the coil 31 and the lift of the moving core 20 is almost linear, and the flow rate can be controlled by automatically controlling the valve opening degree by detecting the load on the coil 31. It can be continuously and finely controlled. Therefore, the fluid pressure within the system will not change due to sudden changes in Takigawa, and the flow rate i$lJ I can be realized over a wide adjustment range while keeping the pressure substantially constant. Furthermore, in this embodiment, the moving core 20 is moved up and down slightly by changing the voltage applied to the coil 31 to perform proportional control of the flow q, so that when the voltage is 0, the meteor is reliably set to 0. It is also necessary to avoid unnecessary deflection of the movable resistance plate 21 at the original position. Adjustment of the origin position in the JP seat portion 22 is extremely delicate, but since the origin adjustment mechanism of this embodiment uses the screw-type needle 4 as described above, it can be easily and accurately adjusted to the optimum position. The origin position of the bottom flow rate can be determined.

Next, an example in which the surface flow rate control well Sv is used to control the flow rate of a fuel injection device in a boiler will be described.

As shown in FIG. 4, the kerosene in the kerosene NI 40 is sent to the bypass nozzle 41 at a predetermined pressure by an electromagnetic pump P. Kerosene is supplied to the nozzle hole 41a at a predetermined pressure.
It is sprayed into the combustion chamber and burned. A part of the kerosene that was not sprayed by the bypass nozzle 41 passes through the flow rate control valve SV at the predetermined pressure and flows back into the kerosene MI40. Here, if the temperature inside the boiler furnace is constantly monitored by a sensor, and the deviation between this value and the target temperature is fed back and the coil voltage of the flow control valve Sv is automatically adjusted, the Takigawa flow of kerosene flowing in the system can be done. can be finely increased or decreased while keeping the pressure almost constant. In other words, proportional flow with a wide adjustment range while the pressure is almost constant! ;[
Control can be achieved automatically, and the temperature inside the boiler can be made to closely match the set target value.

The present invention is not limited to the embodiments described below, and can be widely used in dryers with combustion devices, temperature control equipment, etc., as well as liquid flow rate control in general.

(Effects of the Invention) The flow control valve of the present invention has a fixed resistance plate and a moving resistance plate so that the lift of the moving core is made linearly proportional to the load voltage of the coil, so the pressure can be adjusted at a constant level. This has the effect of realizing proportional flow 11 control over a wide range.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a flow rate control valve of one embodiment, Fig. 2 is a t-plane view of a moving resistance plate in the same embodiment, and Fig. 3 is a diagram showing the lift of the moving core in the flow control valve. A graph showing the relationship with the voltage of the coil, FIG. 4 is a block diagram of a fuel injection system using a 11" flow rate control valve, and FIG. 5 is a block diagram of a conventional fuel injection system using a multi-stage switching system. 17--Fixed core, 19--Fixed resistance plate, 20'
---Moving core, 21--Moving resistance plate, 22--Valve seat portion as a seat member, 31--Coil, SV...
・Meteor control valve.

Claims (1)

[Claims] It comprises a coil, a fixed core provided at one end of the coil, and a moving core that moves within the coil due to the magnetic field generated by the coil, and by changing the voltage applied to the coil, the sheet member provided on the moving core In a flow control valve that controls the flow rate of liquid by opening and closing the liquid flow path, a fixed resistance plate is provided between the moving core and the fixed core to prevent the moving core from suddenly adhering to the fixed core, and is opposite to the fixed core. A flow control valve characterized in that a moving resistance plate is provided at an end of the moving core on the side to restrict movement of the moving core near the end of a stroke where the moving core approaches the fixed core.