JP7437964B2 - proportional solenoid valve - Google Patents

Description

The present invention relates to a proportional solenoid valve suitable for use as a flow control valve that continuously controls the flow rate of fluid such as gas.

Conventionally, a proportional solenoid valve that can continuously control the flow rate of fluid by combining an electromagnetic drive part and a valve mechanism part has been known, such as the flow control valve disclosed in Patent Document 1 proposed by the present applicant. There is.

The flow control valve disclosed in Document 1 is intended to perform highly linear and highly accurate flow control over the entire stroke of the plunger, as well as to perform highly stable and reliable control. The solenoid has an outer yoke provided outside the solenoid and an inner yoke provided inside the solenoid, and the rear end surface faces the front end surface of the inner yoke and is displaced in response to the magnitude of the excitation voltage applied to the solenoid. It is equipped with an electromagnetic drive unit having a plunger, a valve mechanism unit having a valve body that opens and closes a flow path by being provided at the front end of the plunger, and a diaphragm that elastically supports this valve body. The front end surface of the inner yoke is formed by a combination of a flat part and a convex part provided inside the flat part and has a tapered surface, and the front end surface of the inner yoke is formed by a ring-shaped flat part and a concave part provided inside this flat part and has a tapered surface. The ratio of the diameter of the convex portion or the concave portion to the diameter of the rear end surface or the front end surface and the angle of the tapered surface are set to predetermined sizes.

Japanese Patent Application Publication No. 2010-25303

However, the conventional proportional electromagnetic valve (flow rate control valve) disclosed in Patent Document 1 mentioned above had the following problems to be solved.

In the flow control valve of Document 1, a valve body is attached to the center of two disc-shaped diaphragms (plate spring members), and the outer circumference of the diaphragm is attached to the inner surface of a block that forms a flow path. ing. Thereby, the valve body is elastically supported by the central portion of the leaf spring member. Incidentally, since this type of flow control valve continuously controls the flow rate, highly linear and highly accurate flow control is required over the entire stroke of the plunger (valve body).

Therefore, during the manufacturing stage, adjustments are made to reduce variations (tolerances) based on parts and mechanisms. In some cases, by changing to a diaphragm with a different thickness or combining two or more diaphragms, adjust the valve opening by the valve body and the spring force by the diaphragm (plate spring member) to be within the specified standard values. I was going.

However, such conventional adjustment methods require the process of disassembling and reassembling the assembled assembly during adjustment, resulting in a decrease in productivity due to an increase in manufacturing man-hours, as well as an increase in the number of parts. There were some drawbacks, such as the possibility of damage. In addition, since the adjustment is performed by changing the adjustment stepwise within the adjustable range, for example, by changing in units of 0.01 mm, there is a limit to the ability to perform highly accurate adjustment.

The present invention aims to provide a proportional solenoid valve that solves the problems existing in the background art.

In order to solve the above-mentioned problem, the proportional solenoid valve 1 according to the present invention includes a fixed plunger 5 whose rear end 5r side is supported by the yoke 4 inside a yoke 4 provided outside the solenoid 3, and a fixed plunger 5 whose rear end 5r is supported by the yoke 4. An electromagnetic drive unit 2 has a movable plunger 6 arranged to be movable forward and backward relative to the plunger 5 and displaces the movable plunger 6 in response to the magnitude of the excitation voltage Ed applied to the solenoid 3, and a front end of the movable plunger 6. A valve mechanism having a valve body 9 provided at 6f, a valve seat 10 facing the valve body 9 and having a flow path R inside, and an elastic member 11 that elastically supports the movable plunger 6 at one end 11s side. When configuring the proportional solenoid valve including the portion 7, a three-dimensional plate spring 37 that is interposed between the fixed plunger 5 and the movable plunger 6 to restrict the movement of the movable plunger 6 in the perpendicular direction Fc, and an elastic member 11 are provided. The position of the first adjustment mechanism part M1 on the other end 11t side can be adjusted by displacing it in the valve displacement direction Fd by operating the first operation part 12 arranged on the outside of the yoke 4, and the position of the fixed plunger 5. It is characterized by comprising a second adjustment mechanism part M2 whose position can be adjusted by moving it forward and backward relative to the movable plunger 6 by operating a second operation part 13 arranged on the outside of the yoke 4.

In this case, according to the first preferred aspect of the invention, a coil spring 11c can be used as the elastic member 11. Further, the first adjustment mechanism section M1 is arranged between the yoke 4 and the fixed plunger 5, and screws a threaded part 21s provided on the outer peripheral surface 21w into a threaded hole 4n of an opening provided in the yoke 4, An adjustment cylinder 21 can be provided which supports the other end 11t side of the elastic member 11 by the front end 21f and has the first operating portion 12 at the rear end 21r. Note that the first adjustment mechanism section M1 can be provided with a first fixing nut 22 that is screwed into the threaded portion 21s of the adjustment cylinder 21 and that can come into contact with the yoke 4. On the other hand, the second adjustment mechanism part M2 screws a threaded part 5s provided on the outer circumferential surface of the fixed plunger 5 into a threaded hole 21n of an opening provided in the adjustment cylinder 21, and also A second operating section 13 can be provided at the second operating section 13. Note that it is desirable that the second adjustment mechanism section M2 be provided with a second fixing nut 23 that can be screwed into the threaded portion 5s of the fixed plunger 5 and that can come into contact with the adjustment cylinder 21.

On the other hand, according to a second preferred aspect of the invention, the elastic member 11 can be a plate spring 11p. Further, in the first adjustment mechanism part M1, a threaded part 4s provided on the outer circumferential surface 4w of the yoke 4 is screwed into a threaded hole part 24n of an opening provided in the block part 24 having the valve seat 10, and the yoke The first operation part 12 can be provided on the outer circumferential surface of 4. In addition, it is desirable to provide the first fixing nut 12 which can be screwed into the threaded part 4s of the yoke 4 and can come into contact with the block part 24 in the first adjustment mechanism part M1. On the other hand, the second adjustment mechanism part M2 screws a threaded part 5s provided on the outer circumferential surface of the fixed plunger 5 into a threaded hole part 4n of an opening provided in the yoke 4, and also screws the threaded part 5s provided on the outer peripheral surface of the fixed plunger 5 into the screw hole 4n of the opening provided in the yoke 4. A second operation section 13 can be provided. Note that it is desirable that the second adjustment mechanism section M2 is provided with a second fixing nut 23 that can be screwed into the threaded part 5s of the fixed plunger 5 and can come into contact with the yoke 4.

According to the proportional solenoid valve 1 according to the present invention having such a configuration, the following remarkable effects are achieved.

(1) a first adjustment mechanism section M1 that can adjust the position of the other end 11t side of the elastic member 11 by displacing it in the valve displacement direction Fd by operating the first operation section 12 disposed on the outside of the yoke 4; Since the fixed plunger 5 is provided with a second adjustment mechanism part M2 that can adjust the position by moving the fixed plunger 5 forward and backward relative to the movable plunger 6 by operating the second operation part 13 disposed on the outside of the yoke 4, it is possible to adjust the position of the fixed plunger 5 at the manufacturing stage. , it is possible to eliminate the need for disassembly and reassembly of the assembly after assembly due to adjustment. Therefore, it is possible to avoid problems such as damage to parts, and it is also possible to easily adjust the valve opening degree and spring pressure just by operating the operating section from the outside, greatly increasing productivity. Can be done. Furthermore, since continuous position adjustment is possible using the screw mechanism, highly accurate adjustment can be performed. In addition, since the solid plate spring 37 is interposed between the fixed plunger 5 and the movable plunger 6, movement of the movable plunger 6 in the perpendicular direction Fc can be restricted.

(2) By using a coil spring 11c for the elastic member 11 according to a preferred embodiment, stable elastic performance can be ensured and maintained without causing so-called fatigue, and a wide and stable adjustment range can be ensured.

(3) According to a preferred embodiment, when configuring the first adjustment mechanism section M1, the threaded portion 21s arranged between the yoke 4 and the fixed plunger 5 and provided on the outer peripheral surface 21w is connected to the threaded portion 21s of the opening provided on the yoke 4. If the adjusting cylinder 21 is configured by being screwed into the hole 4n, supporting the other end 11t side of the elastic member 11 by the front end 21f, and having the first operation part 12 at the rear end 21r, the adjusting cylinder 21 can be adjusted. With the addition, it is possible to configure an independent first adjustment mechanism section M1 without changing the basic structure of the proportional solenoid valve 1, and in particular, it is possible to arrange the first operating section 12 at the upper end position of the yoke 4. The entire adjustment mechanism is externally protected by the yoke 4, contributing to easier adjustment operations and improved reliability.

(4) According to a preferred aspect, if the first adjustment mechanism section M1 is provided with the first fixing nut 22 that can be screwed into the threaded part 21s of the adjustment cylinder 21 and can come into contact with the yoke 4, the adjustment after adjustment is possible. Since the cylinder 21 can be reliably fixed, positional deviation after adjustment can be prevented, an accurate adjusted position can be maintained over a long period of time, and readjustment can be easily performed.

(5) According to a preferred embodiment, when configuring the second adjustment mechanism part M2, the threaded part 5s provided on the outer peripheral surface of the fixed plunger 5 is screwed into the threaded hole part 21n of the opening provided in the adjustment cylinder 21, and , if the second operating section 13 is provided on the rear end 5r side of the fixed plunger 5, the second adjusting mechanism section M2 and the second operating section 13 can be arranged inside the first adjusting mechanism section M1 and the first operating section 12. Since the first adjustment mechanism section M1 can be arranged in the same direction, the first adjustment mechanism section M1 and the first operation section 12 can be operated from the same direction, which contributes to facilitating the adjustment operation. This can contribute to miniaturization of the entire adjustment mechanism combined with the adjustment mechanism section M1.

(6) According to a preferred aspect, if the second adjustment mechanism section M2 is provided with the second fixing nut 23 that can be screwed into the threaded part 5s of the fixed plunger 5 and can come into contact with the adjustment cylinder 21, the Since the fixed plunger 5 can be reliably fixed, it is possible to prevent positional deviation after adjustment, maintain an accurate adjusted position over a long period of time, and readjustment can be easily performed.

(7) According to a preferred embodiment, if the plate spring 11p is used as the elastic member 11, it can be constructed from a plate material or a combination thereof, which can contribute to miniaturization of the entire electromagnetic valve and further cost reduction.

(8) According to a preferred aspect, when configuring the first adjustment mechanism part M1, the threaded part 4s provided on the outer circumferential surface 4w of the yoke 4 is replaced with a threaded hole part of an opening provided in the block part 24 having the valve seat 10. 24n, and by providing the first operating section 12 on the outer peripheral surface of the yoke 4, the yoke 4 itself can be used both as the first adjusting mechanism section M1 and the first operating section 12. This can be carried out without adding additional parts such as, and can contribute to the simplification and cost reduction of the entire adjustment mechanism.

(9) According to a preferred aspect, if the first adjustment mechanism part M1 is provided with the first fixing nut 12 that can be screwed into the threaded part 4s of the yoke 4 and can come into contact with the block part 24, the yoke after adjustment can be adjusted. 4 can be reliably fixed, positional deviation after adjustment can be prevented, accurate adjusted positions can be maintained over a long period of time, and readjustment can be easily performed.

(10) According to a preferred embodiment, when configuring the second adjustment mechanism part M2, the threaded part 5s provided on the outer peripheral surface of the fixed plunger 5 is screwed into the threaded hole part 4n of the opening provided in the yoke 4, and If the second operation part 13 is provided on the rear end 5r side of the fixed plunger 5, the second adjustment mechanism part M2 and the second operation part 13 can be arranged inside the yoke 4, so that the first adjustment This can contribute to miniaturization of the entire adjustment mechanism combined with the mechanism section M1.

(11) According to a preferred aspect, if the second adjustment mechanism part M2 is provided with the second fixing nut 23 that can be screwed into the threaded part 5s of the fixed plunger 5 and can come into contact with the yoke 4, the fixation after adjustment is achieved. Since the plunger 5 can be securely fixed, it is possible to prevent positional deviation after adjustment, maintain an accurate adjusted position over a long period of time, and readjustment can be easily performed.

A longitudinal side view of a proportional solenoid valve according to a basic embodiment of the present invention, Plan view of the proportional solenoid valve, An explanatory diagram of the change in flow rate with respect to the excitation voltage of a proportional solenoid valve, Explanation diagram of the action of a proportional solenoid valve, A flowchart for explaining the adjustment procedure and operation of the proportional solenoid valve, An explanatory diagram of the adjustment process extracting and showing the first adjustment mechanism part of the proportional solenoid valve, An explanatory diagram of the adjustment process extracting and showing the second adjustment mechanism part of the proportional solenoid valve, A longitudinal side view of a proportional solenoid valve according to a modified embodiment of the present invention, Plan view of the proportional solenoid valve,

Next, preferred embodiments of the present invention will be described in detail based on the drawings.

First, the configuration of a proportional solenoid valve 1 according to this embodiment (basic embodiment) will be described with reference to FIGS. 1 and 2.

The illustrated proportional solenoid valve 1 is a normally closed type, and as shown in FIG. The valve mechanism section 7 is located on the closed side in the direction Fd. The electromagnetic drive unit 2 includes a cylindrical solenoid 3 configured by winding a wire around a coil bobbin 31. Further, a yoke 4 is disposed outside the solenoid 3 to cover the solenoid 3. The yoke 4 is entirely made of a magnetic material, and includes a cylindrical yoke side surface 4m, a ring-shaped upper end surface 4u integrally formed at the upper end of the yoke side surface 4m, and a ring-shaped yoke side surface 4m that covers the lower end opening of the yoke side surface 4m. It is constituted by a lower end surface portion 4d. Inside the solenoid 3, that is, on the upper side (rear side) of the internal space of the cylindrical body part 31c of the coil bobbin 31, a cylindrical fixed plunger 5 made of a magnetic material is arranged, and on the lower side (front side) , a cylindrical movable plunger 6 made of a magnetic material is arranged. The fixed plunger 5 is supported by the upper end surface section 4u of the yoke 4 via a first adjustment mechanism section M1 and a second adjustment mechanism section M2, which will be described later, and the movable plunger 6 can move forward and backward in the valve displacement direction Fd. will be arranged.

Further, the outer diameters of the fixed plunger 5 and the movable plunger 6 are formed to be slightly smaller than the inner diameter of the cylindrical body part 31c of the coil bobbin 31, and a gap between each of the plungers 5, 6 and the cylindrical body part 31c created thereby is filled with a second diameter. A cylindrical adjustment tube 21 constituting one adjustment mechanism section M1 is housed therein. This adjustment cylinder 21 has engaging parts 12c, 12c (see FIG. 2) that can lock a rotating operation jig formed at the upper end of the outer circumferential surface 21w, and a first operating part disposed on the outside of the yoke 4. 12, and a threaded portion 21s is formed on the outer circumferential surface 21w located below the engaging portions 12c, 12c.

On the other hand, a screw hole 4n is formed in the opening provided at the center of the upper end surface portion 4u of the yoke 4, and a screw portion 21s on the adjustment cylinder 21 side is screwed into this screw hole 4n. As a result, by rotating the first operating portion 12 of the adjustment tube 21, the adjustment tube 21 can be displaced in the vertical direction (valve displacement direction Fd), and the front end 21f of the adjustment tube 21 is used to actuate the coil spring 11c, which will be described later. A first adjustment mechanism section M1 is configured that can adjust the position by displacing the position of the other end 11t of the elastic member 11.

In this way, the threaded part 21s disposed between the yoke 4 and the fixed plunger 5 and provided on the outer peripheral surface 21w is screwed into the threaded hole 4n of the opening provided in the yoke 4, and the front end 21f allows the elastic member 11 If the adjustment cylinder 21 supporting the other end 11t side and having the first operation part 12 at the rear end 21r is provided to constitute the first adjustment mechanism part M1, the adjustment cylinder 21 can be added to the proportional solenoid valve 1. The independent first adjustment mechanism section M1 can be configured without changing the basic structure, and in particular, the first operation section 12 can be placed at the upper end of the yoke 4, so the entire adjustment mechanism can be removed from the yoke 4. This can contribute to easier adjustment operations and improved reliability.

Further, a recess 4ui is formed on the upper surface of the upper end surface portion 4u of the yoke 4, and the first fixing nut 22 is accommodated in the recess 4ui and is screwed into the threaded portion 21s of the adjustment cylinder 21. This first fixing nut 22 can come into contact with the yoke 4 by rotating it. In this way, by providing the first fixing nut 22 that can be screwed onto the threaded portion 21s of the adjustment tube 21 and abutted against the yoke 4 in the first adjustment mechanism section M1, the adjustment tube 21 can be securely fixed after adjustment. Since it can be fixed to the position, it is possible to prevent positional deviation after adjustment, maintain an accurate adjusted position for a long period of time, and readjustment can be easily performed.

On the other hand, the fixed plunger 5 includes a plunger body 5m and a bolt portion integrally formed upwardly in the valve displacement direction Fd from the upper end surface (rear end surface) of the plunger body 5m and having a threaded portion 5s on the outer peripheral surface. 5b. Therefore, this threaded portion 5s functions as a threaded portion 5s provided on the outer peripheral surface of the fixed plunger 5. Further, a groove 5bc in which a rotating operation jig can be locked is formed on the upper end surface of the bolt portion 5b. Thereby, this bolt portion 5b functions as a second operating portion 13 disposed on the rear end 5r side of the fixed plunger 5, that is, on the outside of the yoke 4. Further, a support end surface 21e is integrally formed at the upper end of the adjustment tube 21, and a screw hole 21n is formed in the opening provided at the center of the support end surface 21e. The threaded portion 5s of the bolt portion 5b in No. 5 is screwed together.

As a result, the threaded portion 5s provided on the outer peripheral surface of the fixed plunger 5 is screwed into the threaded hole 21n of the opening provided in the adjustment tube 21, and the second operating portion 13 is attached to the rear end 5r side of the fixed plunger 5. A second adjustment mechanism section M2 is provided, that is, a second adjustment mechanism section M2 that can adjust the position of the fixed plunger 5 by displacing the fixed plunger 5 in the vertical direction by operating the second operation section 13. be done.

In this way, the threaded portion 5s provided on the outer peripheral surface of the fixed plunger 5 is screwed into the threaded hole 21n of the opening provided in the adjustment tube 21, and the second operating portion 13 is attached to the rear end 5r side of the fixed plunger 5. If the second adjustment mechanism section M2 is provided, the second adjustment mechanism section M2 and the second operation section 13 can be arranged inside the first adjustment mechanism section M1 and the first operation section 12. The adjustment operation of the first adjustment mechanism section M1 and the operation of the first adjustment mechanism section M1 and the first operation section 12 from the same direction are possible, which contributes to facilitating the adjustment operation, and when combined with the first adjustment mechanism section M1. This can contribute to making the entire adjustment mechanism smaller and more compact.

Furthermore, the second fixing nut 23 is screwed onto the bolt portion 5b that protrudes upward from the support end surface portion 21e. Therefore, the second fixing nut 23 can be screwed onto the fixed plunger 5 and can come into contact with the adjustment cylinder 21. In this way, if the second adjustment mechanism part M2 is provided with the second fixing nut 23 that can be screwed into the threaded part 5s of the fixed plunger 5 and can come into contact with the adjustment cylinder 21, the fixed plunger 5 after adjustment can be adjusted. Since it can be securely fixed, it is possible to prevent positional deviation after adjustment, maintain an accurate adjusted position for a long period of time, and readjustment can be easily performed.

On the other hand, the valve mechanism section 7 includes a block section 24 made of a non-magnetic material such as stainless steel. The upper end surface 24c of this block portion 24 serves as a mounting surface for attaching the lower end surface portion 4d of the yoke 4 on the electromagnetic drive portion 2 side, and the lower end surface of the block portion 24 serves as a mounting surface 24j on the flow path piping side. A hollow valve chamber 32 is provided inside the block portion 24, and a cylindrical valve seat 10 protruding upward is formed at the center of a bottom surface portion 32d forming the valve chamber 32. The inside of this valve seat 10 becomes a flow path R, and in the illustrated case, the lower end of this flow path R is opened to the mounting surface 24j as an inflow port 33i, and the bottom surface portion 32d located around the valve seat 10 is opened to the mounting surface 24j. , one or more outlet ports 33e... are formed. As a result, the lower ends of the outlet ports 33e whose upper ends communicate with the valve chamber 32 are opened to the mounting surface 24j. Furthermore, a communication space 25 is formed through the valve chamber 32 and the upper end surface 24c of the block portion 24.

On the other hand, the movable plunger 6 includes a plunger body 6m, a shaft-shaped spring support 6s integrally formed to protrude downward from the lower end surface (tip surface) of the plunger body 6m in the valve displacement direction Fd, and this spring support. The spring supporting portion 6s and the valve body mounting plate portion 6c are housed in the communication space 25. Then, a valve member 9g made of rubber or the like is fixed to the lower surface of the valve body mounting board portion 6c. The valve member 9g and the valve body mounting plate portion 6c constitute a valve body 9 provided at the front end 6f of the movable plunger 6. The lower surface of the valve body 9 faces the upper end opening of the valve seat 10, and the flow path R It functions as a valve body 9 that opens and closes.

Further, the center opening of a ring-shaped spring seat 34 is attached to the spring support portion 6s, and a compressed elastic member 11, That is, the compressed coil spring 11c is attached. If such a coil spring 11c is used as the elastic member 11, stable elastic performance can be ensured and maintained without causing so-called fatigue, and a wide and stable adjustment range can be ensured.

Therefore, the spring support portion 6s passes through the center opening of the spring seat 34 and the inside of the coil spring 11c, and the upper surface of the spring seat 34 is pressed against the front end (lower end) 21f of the adjustment cylinder 21 due to the spring pressure of the coil spring 11c. do. In this state, a gap at a predetermined interval is set between the upper surface of the spring seat 34 and the lower end surface of the plunger body 6m. Further, the lower surface of the spring seat 34 is pressed against the other end (upper end) 11t of the coil spring 11c, and the one end (lower end) 11s of the coil spring 11c is locked to the large diameter portion at the lower end of the spring support 6s, thereby causing electromagnetic When the solenoid 3 of the drive unit 2 is de-energized, the lower surface of the valve body 9 comes into pressure contact with the upper end opening of the valve seat 10, resulting in a normally closed state. Furthermore, a ring-shaped plate spring 35 is attached between the outer peripheral surface of the lower end of the spring support portion 6s and the inner peripheral surface of the communication space 25. This plate spring 35 restricts the movement of the movable plunger 6 in the direction Fc perpendicular to the valve displacement direction Fd.

In addition, in FIGS. 1 and 2, 36a and 36b are rubber sealing O-rings provided on the outer peripheral surface of the fixed plunger 5 and the inner peripheral surface of the communication space 25, and 37 is a rubber sealing O-ring provided between the fixed plunger 5 and the movable plunger 6. Three-dimensional plate springs 38 that are interposed to restrict the movement of the movable plunger 6 in the right angle direction Fc each represent a power supply cord led out from the solenoid 3.

Next, the basic operation including an example of use of the proportional solenoid valve 1 according to the present embodiment (basic embodiment) configured as described above will be explained with reference to FIG. 3 (FIG. 1) and FIG. 4.

FIG. 4 shows an example of how the proportional solenoid valve 1 is used, that is, an example in which the proportional solenoid valve 1 is attached to a valve connector 41 for gas piping. In this case, the gas supply section 42 is connected to the inflow side connection port 41i of the valve connector 41, and the outflow side connection port 41e of the valve connector 41 is connected to the gas supplied section 43. Further, the power supply cord 38 led out from the proportional solenoid valve 1 is connected to a power supply section 45, and this power supply section 45 is connected to a control section 46. As a result, a control signal is applied from the control unit 46 to the power supply unit 45, and an excitation voltage Ed having a magnitude corresponding to the control signal is applied from the power supply unit 45 to the solenoid 3 of the proportional solenoid valve 1.

Now, if the excitation voltage Ed applied to the solenoid 3 from the power supply section 45 is zero (OFF state), the valve opening of the proportional solenoid valve 1 will also be zero, so the proportional solenoid valve 1 will be in the normal state shown in FIG. It will be in the off state. That is, since the solenoid 3 of the electromagnetic drive unit 2 is not energized, the valve body 9 is pressed against the upper end opening of the valve seat 10 by the spring pressure of the coil spring 11c. As a result, the flow path R is cut off and becomes fully closed.

On the other hand, if the output of the power supply section 45 is turned on and the magnitude of the excitation voltage Ed is changed, the magnitude of the valve opening (gas flow rate Q) will change as shown in the characteristic curve Ps shown in FIG. , changes depending on the magnitude of the excitation voltage Ed. That is, if the magnitude of the excitation voltage Ed is gradually increased from zero, the magnetic force generated by the excitation of the solenoid 3 will also gradually increase, and the movable plunger 6 will be attracted to the fixed plunger 5 side and displaced upward. At this time, the valve opening gradually increases from Eds[V] and stops at the position where the movable plunger 6 abuts the fixed plunger 5. At this position, the valve opening degree is maximum, that is, it is fully open, and the flow rate Q is the maximum flow rate Qm [L/min]. In FIG. 4, Lm indicates a stroke range in which the valve body 9 is displaced from a fully closed state to a fully open state, and arrows Fg... indicate the direction of gas flow.

Therefore, in this type of proportional solenoid valve 1, it is important for the characteristic curve Ps of each product to remain within a certain reference value without variation in order to ensure homogeneity. In the proportional solenoid valve 1 according to the present embodiment, by adjusting the spring pressure of the coil spring 11c, the starting point Pss at which the valve body 9 starts to open can be made constant, and the vertical position of the fixed plunger 5 can be adjusted. Accordingly, the maximum valve opening degree, that is, the maximum flow rate Qms can be kept constant. Basically, in the assembled state, the first adjustment mechanism section M1 can easily adjust the spring pressure of the coil spring 11c, and the second adjustment mechanism section M2 can adjust the vertical position (maximum valve opening) of the fixed plunger 5. ) can be easily adjusted. In addition, in FIG. 3, Ze indicates the adjustment range by the first adjustment mechanism section M1, Zq indicates the adjustment range by the second adjustment mechanism section M2, and Psm shown by a virtual line indicates an example of the characteristic curve before non-adjustment. There is.

Next, a method (procedure) for adjusting the first adjustment mechanism section M1 and second adjustment mechanism section M2 provided in the proportional solenoid valve 1 will be specifically explained with reference to FIGS. 5 (FIG. 1) to FIG. 7.

FIG. 6 is an explanatory diagram of the adjustment process that extracts and shows the first adjustment mechanism part M1, and FIG. 7 shows an explanatory diagram of the adjustment process that extracts and shows the second adjustment mechanism part M2. Note that during adjustment, the first fixing nut 22 and the second fixing nut 23 in FIG. 1 are kept in a loosened state. Moreover, as for the order of adjustment, first adjustment is performed by the first adjustment mechanism section M1, and then adjustment is performed by the second adjustment mechanism section M2.

First, a rotational operation jig is locked to the engaging portions 21c, 21c of the adjustment tube 21, which becomes the first operation section 12, and the adjustment tube 21 is rotated (step S1). Since the threaded portion 21s provided on the outer peripheral surface 21w of the adjustment tube 21 is screwed into the screw hole 4n provided in the fixed side yoke 4, the adjustment tube 21 itself is rotated in the vertical direction ( As a result, the spring seat 34, which is in pressure contact with the front end 21f of the adjusting cylinder 21, also follows and is displaced vertically (step S2). As a result, the upper end of the coil spring 11c also follows and moves up and down, and at this time, since the lower end position of the coil spring 11c is restricted, the coil spring 11c expands and contracts, and the magnitude of the spring pressure also changes (step S3). The adjustment tube 21 shown by the imaginary line in FIG. 6 is displaced by the amount of movement L1u in the upward direction Fdu of the valve displacement direction Fd with respect to the adjustment tube 21 shown by the solid line, and the coil spring 11c shown by the imaginary line is The coil spring 11c is shown expanded upward relative to the solid line shown by the coil spring 11c.

Then, the adjustment cylinder 21 is rotated, and when the set target value is reached, the rotation operation is stopped, and then the position of the adjustment cylinder 21 is fixed by tightening the first fixing nut 22 (step S4, S5). In this case, the target value is the Pss point shown in FIG. 3 described above. Therefore, as an example, a state in which compressed air is applied from the inflow side connection port 41i and Eds [V] is applied as the excitation voltage Ed is shown in FIG. In this case, the position of the adjustment cylinder 21 immediately before the pressure of the compressed air decreases can be set as the target value.

Next, the rotation operation jig is engaged with the concave groove 5bc of the bolt part 5b of the fixed plunger 5, which becomes the second operation part 13, and the fixed plunger 5 is rotated (step S6). The bolt part 5b of the fixed plunger 5 is screwed into the screw hole part 21n of the support end surface part 21e of the adjustable cylinder 21 whose position is fixed. displacement direction Fd) (step S7). As a result, the size of the gap between the lower end surface of the fixed plunger 5 and the upper end surface of the movable plunger 6, that is, the position of the valve body 9 at which the maximum valve opening degree (maximum displacement stroke of the valve body 9) changes (step S8). The fixed plunger 5 shown by the imaginary line in FIG. 7 has been displaced by the amount of movement L2u in the upward direction Fdu in the valve displacement direction Fd with respect to the fixed plunger 5 shown by the solid line.

Then, the fixed plunger 5 is rotated, and when the set target value is reached, the rotation operation is stopped, and the position of the fixed plunger 5 is fixed by tightening the second fixing nut 23 (steps S9 and S10). In this case, the target value is the Qms point shown in FIG. The position of the fixed plunger 5 when the flow rate target value is reached can be set as the target value.

As described above, the proportional solenoid valve 1 according to the present embodiment (basic embodiment) has a basic configuration in which the first operation is performed such that the other end 11t side of the coil spring 11c (elastic member 11) is located outside the yoke 4. The position of the fixed plunger 5 can be adjusted by adjusting the position of the first adjusting mechanism part M1 by displacing it in the valve displacement direction Fd by operating the part 12, and by adjusting the position of the fixed plunger 5 by operating the second operating part 13 disposed outside the yoke 4. Since the second adjustment mechanism section M2 is provided with the second adjustment mechanism section M2 whose position can be adjusted by moving forward and backward relative to the second adjustment mechanism section M2, it is possible to eliminate the need for disassembly and reassembly of the assembly after assembly due to adjustment during the manufacturing stage. Therefore, it is possible to avoid problems such as damage to parts, and it is also possible to easily adjust the valve opening degree and spring pressure just by operating the operating section from the outside, greatly increasing productivity. Can be done. Furthermore, since continuous position adjustment is possible using the screw mechanism, highly accurate adjustment can be performed.

Next, a proportional solenoid valve 1 according to a modified embodiment of the present invention will be described with reference to FIGS. 8 and 9.

The first difference between the modified embodiment and the basic embodiment shown in FIG. The screw portion 4s provided in the valve seat 10 is screwed into the screw hole portion 24n of the opening provided in the block portion 24 having the valve seat 10, and the first operating portion 12 is provided on the outer peripheral surface 4w of the yoke 4. It is in. In this case, the communication space 25 and the valve chamber 32 in the basic embodiment are formed within the lower end surface portion 4d of the yoke 4. Therefore, the first adjustment mechanism section M1 in the modified embodiment allows the yoke 4 itself to be used both as the first adjustment mechanism section M1 and the first operation section 12, so it can be implemented without adding separate parts such as an adjustment tube. This can contribute to the simplification and cost reduction of the entire adjustment mechanism.

The second difference between the modified embodiment and the basic embodiment is that a plate spring 11p is used as the elastic member 11. The illustrated plate spring 11p uses two stacked plate spring members 11pu and 11pd. The center of the leaf spring 11p is attached to the front end 6f of the movable plunger 6, and the outer peripheral side of the leaf spring 11p is attached to the inner peripheral surface of the communication space 25. Note that the leaf spring 11p also serves as the partition plate 35 used in the basic embodiment, so the leaf spring 11p also serves as the partition plate 35. In this way, if the leaf spring 11p is used as the elastic member 11, it can be constructed from a plate material or a combination thereof, which can contribute to miniaturization of the entire electromagnetic valve and further cost reduction.

In the first adjustment mechanism section M1 in the modified embodiment, if the yoke 4 is rotated by the first operating section 12, the yoke 4 can be vertically displaced in the valve displacement direction Fd with respect to the block section 24, so that the valve The spring pressure of the leaf spring 11p against the body 9 can be changed (adjusted). Therefore, in the modified embodiment, the adjustment cylinder 21 in the basic embodiment does not exist.

Further, the first fixing nut 22 provided on the first adjustment mechanism part M1 is screwed into the threaded part 4s of the yoke 4. Thereby, the first fixing nut 22 can come into contact with the block portion 24. If such a first fixing nut 22 is provided, the yoke 4 can be securely fixed after adjustment, thereby preventing positional shift after adjustment, maintaining an accurate adjusted position for a long period of time, and facilitating readjustment. It can be carried out.

On the other hand, the basic configuration of the second adjustment mechanism section M2 in the modified embodiment is the same as the second adjustment mechanism section M2 in the basic embodiment, although the details are different. That is, in the modified embodiment, the threaded portion 5s provided on the outer circumferential surface 5w (bolt portion 5b) of the fixed plunger 5 is screwed into the threaded hole portion 4n of the opening provided in the yoke 4, and the rear end of the fixed plunger 5 A second operation section 13 is provided on the 5r side. If such a second adjustment mechanism section M2 is provided, the second adjustment mechanism section M2 and the second operation section 13 can be arranged inside the yoke 4, so that adjustment in combination with the first adjustment mechanism section M1 can be performed. This can contribute to making the entire mechanism smaller and more compact. Therefore, if the fixed plunger 5 is rotated by the second operation part 13, the fixed plunger 5 can be vertically displaced in the valve displacement direction Fd with respect to the movable plunger 6, so that the maximum valve opening of the valve body 9 can be changed (adjusted).

Further, the second fixing nut 23 provided in the second adjustment mechanism section M2 also has the same basic configuration as the basic embodiment. That is, the second fixing nut 23 is screwed into the threaded portion 5s of the fixed plunger 5. Thereby, the second fixing nut 23 can come into contact with the yoke 4. If such a second fixing nut 23 is provided, the fixed plunger 5 can be securely fixed after adjustment, thereby preventing positional shift after adjustment, maintaining an accurate adjusted position for a long period of time, and making readjustment easy. can be done.

In the proportional solenoid valve 1 according to the modified embodiment, although the configuration and shape of other details are different from the basic embodiment, the basic configuration and function are the same as the basic embodiment, and the basic structure is the same as the basic embodiment. You can enjoy the effective effects. Therefore, in FIGS. 8 and 9 showing the modified embodiment, the same components and functional parts as those in FIGS. 1 and 2 showing the basic embodiment are given the same reference numerals to clarify the structure. , detailed explanation will be omitted.

Although the preferred embodiments (basic embodiment and modified embodiments) have been described in detail above, the present invention is not limited to such embodiments, and the detailed configuration, shape, material, quantity, numerical value, etc. Any changes, additions, or deletions may be made without departing from the gist of the present invention. For example, although an example is shown in which the coil spring 11c or the plate spring 11p is used as the elastic member 11, other elastic members or combinations of each elastic member are not excluded. Further, the first fixing nut 22 and the second fixing nut 23 are not essential components, and fixing means such as applying adhesive after adjustment, for example, are not excluded. On the other hand, as in the above-mentioned cited document 1, a convex portion (or concave portion) may be provided on the rear end surface of the movable plunger 6, and a convex portion (convex portion) may be provided on the front end surface of the fixed plunger 5. Further, although the normally closed type proportional solenoid valve 1 is illustrated, the present invention is similarly applicable to a normally open type (fully open when not energized). Note that although gas is illustrated as an example of the fluid, various fluids such as air and liquid can be applied.

The proportional solenoid valve according to the present invention can be used as various solenoid valves such as a flow rate control valve that continuously controls the flow rate of fluid such as gas.

1: proportional solenoid valve, 2: electromagnetic drive unit, 3: solenoid, 4: yoke, 4w: outer circumferential surface of yoke, 4s: threaded part of yoke, 4n: threaded hole part of yoke opening, 5: fixed plunger, 5s: Threaded portion on the outer circumferential surface of the fixed plunger, 5r: Rear end of the fixed plunger, 6: Movable plunger, 6f: Front end of the movable plunger, 7: Valve mechanism section, 9: Valve body, 10: Valve seat, 11: Elasticity Members, 11s: one end of the elastic member, 11t: other end of the elastic member, 11c: coil spring, 11p: plate spring, 12: first operation section, 13: second operation section, 21: adjustment tube, 21w: adjustment tube Outer circumferential surface, 21s: Threaded part of the adjustment cylinder, 21f: Front end of the adjustment cylinder, 21r: Rear end of the adjustment cylinder, 21n: Screw hole at the opening of the adjustment cylinder, 22: First fixing nut, 23: Second fixation Nut, 24: Block part, 24n: Screw hole part of block part, 37: Three-dimensional plate spring, Ed: Excitation voltage, R: Flow path, Fd: Valve displacement direction, Fc: Right angle direction of movable plunger, M1: First Adjustment mechanism section, M2: Second adjustment mechanism section

Claims (11)

A fixed plunger whose rear end side is supported by the yoke is provided inside a yoke provided outside the solenoid, and a movable plunger arranged to be movable forward and backward relative to the fixed plunger, and an excitation voltage applied to the solenoid. an electromagnetic drive unit that displaces the movable plunger in accordance with the size of the movable plunger, a valve body provided at the front end of the movable plunger, and a valve seat facing the valve body and having a flow path inside; In a proportional solenoid valve comprising a valve mechanism having an elastic member that elastically supports the movable plunger at one end side, movement of the movable plunger in a right angle direction is restricted by interposing the movable plunger between the fixed plunger and the movable plunger. a three-dimensional plate spring, a first adjustment mechanism part whose position can be adjusted by displacing the other end side of the elastic member in a valve displacement direction by operating a first operation part disposed outside the yoke; and the fixing member. a second adjustment mechanism part capable of adjusting the position of the plunger by moving it forward or backward with respect to the movable plunger by operating a second operation part disposed outside the yoke; valve. The proportional solenoid valve according to claim 1, wherein the elastic member is a coil spring. The first adjustment mechanism is disposed between the yoke and the fixed plunger, and has a threaded portion provided on the outer peripheral surface screwed into a threaded hole of an opening provided in the yoke, and has an inner end that adjusts the elasticity. 3. The proportional solenoid valve according to claim 1, further comprising an adjustment cylinder that supports the other end of the member and has the first operating portion at its rear end. 4. The proportional solenoid valve according to claim 3, wherein the first adjustment mechanism includes a first fixing nut that is screwed into the threaded portion of the adjustment cylinder and that can abut against the yoke. The second adjustment mechanism part screws a threaded part provided on the outer peripheral surface of the fixed plunger into a threaded hole part of an opening provided in the adjustment cylinder, and also includes a screw part provided on the outer circumferential surface of the fixed plunger, and a second adjustment mechanism provided on the rear end side of the fixed plunger. 4. The proportional solenoid valve according to claim 3, further comprising: a proportional solenoid valve. 4. The proportional solenoid valve according to claim 3, wherein the second adjustment mechanism includes a second fixing nut that is screwed into the threaded portion of the fixed plunger and can come into contact with the adjustment cylinder. 2. The proportional solenoid valve according to claim 1, wherein the elastic member is a plate spring. The first adjustment mechanism part screws a threaded part provided on the outer peripheral surface of the yoke into a threaded hole part of an opening provided in the block part having the valve seat, and also screws the threaded part provided on the outer peripheral surface of the yoke into a threaded hole part of an opening provided in the block part having the valve seat. 8. The proportional electromagnetic valve according to claim 1, further comprising one operating section. 9. The proportional solenoid valve according to claim 8, wherein the first adjustment mechanism includes a first fixing nut that is screwed into the threaded portion of the yoke and can abut against the block portion. The second adjustment mechanism unit screws a threaded portion provided on the outer circumferential surface of the fixed plunger into a screw hole of an opening provided in the yoke, and also includes a second operating portion provided on the rear end side of the fixed plunger. 9. The proportional solenoid valve according to claim 8, further comprising: 11. The proportional electromagnetic valve according to claim 10, wherein the second adjustment mechanism includes a second fixing nut that is screwed into the threaded portion of the fixed plunger and can come into contact with the yoke.

Images