JPH0680079U - Solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize responsiveness while suppressing pulsation. A discharge flow rate adjusting means 21 for adjusting a flow rate discharged from a discharge port 16A for discharging the fluid accumulated in the solenoid body 7 to the outside is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve used for various oils, pneumatic control, etc.

[0002]

[Prior art]

 As a conventional solenoid valve of this type, there is one shown in FIG. 2, for example. That is, the solenoid valve 100 includes a spool 106 that is reciprocally inserted into an inner circumference of a guide hole 105 of a valve body 104 provided with a supply port 101, a control port 102, and a drain port 103 as inflow and outflow ports, and a spool. It is composed of a solenoid body 107 for driving 106.

The solenoid body 107 is a plunger 108 made of a magnetic material that is reciprocally inserted into the solenoid body 107, a cylindrical center post 109 made of a magnetic material that magnetically attracts the plunger 108, and a plunger 108. A rod 110 inserted into the center post 109 so as to reciprocate in the inner periphery of the center post 109, a stopper portion 111 for restricting the axial movement of the plunger 108, and a solenoid body 107 provided on the stopper portion 111 are accumulated in the main body 107. And a discharge port 112 for discharging the discharged fluid to the outside.

A spring A 113 for contacting the tip of the rod 110 with the spool 106 is interposed between the plunger 108 and the stopper portion 111, and the spool 106 is solenoid-operated at the end of the spool 106. A spring B114 for urging the main body 107 side is provided.

When the solenoid main body 107 is off, the spring force of the spring B 114 causes the spool 106 to move toward the solenoid main body 107 side to open the supply port 101 and communicate with the control port 102, so that the fluid flows into the valve main body. It is supplied into the control port 102 and flows into the control port 102. Further, when the solenoid main body 107 is turned on, the plunger 108 is magnetically attracted to the center post 109, and the rod 110 operatively connected to the plunger 108 pushes the spool 6 against the spring force of the spring B114 and moves away from the solenoid main body 107. Move to. As a result, the supply port 101 is closed, the drain port 103 is opened, and the fluid flows out.

[0006]

[Problems to be solved by the device]

 However, in the case of the above-described conventional technique, when the solenoid body 107 is off, the supply port 101 is opened by the movement of the spool 106, and the fluid supplied into the valve body 104 has a gap between the valve body 104 and the spool 106. → Collected in the solenoid body 107 through the gap between the center post 109 and the rod 110, and the accumulated fluid is discharged to the outside of the solenoid body 107 through the passage 115 provided in the plunger 108 → the discharge port 112 of the stopper portion 111. To be done. At this time, the resonance frequency of the springs A, B 113 and 114, the frequency of the power source applied to the solenoid body 107, and the fluid force flowing between the valve body 104 and the spool 106 violently vibrates the spool 106 to cause pulsation and increase the hysteresis. There are cases.

On the other hand, if the discharge port 112 of the stopper portion 111 is blocked, the pulsation is suppressed, but there is a drawback that the responsiveness deteriorates. Furthermore, considering the individual differences of each part, it can be said that it is extremely difficult to stably manufacture products that have both vibration damping and response.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a solenoid valve capable of stabilizing responsiveness while suppressing pulsation. .

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a valve body having a guide hole inside and an inflow / outflow port, a spool slidably inserted into the inner periphery of the guide hole, and a spool are provided. A solenoid main body for reciprocating drive, and the electromagnetic attraction force of the solenoid main body is used to open and close the inflow / outflow port by moving the spool. The solenoid main body is stored in the solenoid main body. A solenoid valve having a discharge port for discharging fluid to the outside of the solenoid body is characterized in that discharge flow rate adjusting means for adjusting a flow rate discharged from the discharge port is provided.

[0010]

[Action]

 In the solenoid with the above configuration, since a discharge flow rate adjusting means for adjusting the flow rate discharged from the discharge port that discharges the fluid accumulated in the solenoid body to the outside of the solenoid body is provided, it may cause a loss of responsiveness. The flow rate of the fluid discharged to the outside of the solenoid body can be adjusted without blocking the discharge port. Therefore, the flow rate of the fluid accumulated in the solenoid main body can be adjusted, and the responsiveness can be stabilized while suppressing the pulsation caused by the vibration due to the fluid force generated between the valve main body and the spool.

[0011]

【Example】

 The present invention will be described below based on the illustrated embodiment. In FIG. 1, which shows a solenoid valve according to an embodiment of the present invention, reference numeral 1 denotes a solenoid valve. The solenoid valve 1 has a schematic configuration including a supply port 2 as an inflow / outflow port, a control port 3 and a drain. A valve sleeve 5 as a valve body provided with a port 4, a spool 6 slidably inserted into the inner circumference of the valve sleeve 5, and a solenoid body 7 for driving the spool 6 integrally assembled with the valve sleeve 5. And consists of.

The valve sleeve 5 has a substantially cylindrical shape and is provided with a supply port 2, a control port 3 and a drain port 4 in this order from the solenoid main body 7 side, spaced apart from each other by a predetermined distance in the axial direction. A guide hole 8 is formed inside the valve sleeve 5, and the spool 6 is inserted in the inner periphery of the guide hole 8 so that the spool 6 can reciprocate. The valve sleeve 5 has a small diameter portion 51 having a slightly smaller diameter on the solenoid body 7 side of the guide hole 8 and a larger diameter portion 52 on the opposite side.

The spool 6 is provided with a first land portion 61 and a second land portion 62 which are axially separated from each other and are in sliding contact with the inner circumference of the valve sleeve 5. The supply port 2 is opened and closed, and the second land portion 62 opens and closes the drain port 4. An annular recess 63 is formed between the first land portion 61 and the second land portion 62. Further, an annular groove 64 is formed near the solenoid body 7 of the first land portion 61, and the solenoid body 7 side of the groove 64 has a small diameter so as to be in sliding contact with the small diameter portion 51 of the valve sleeve 5. There is. A communication passage 65 that connects the concave groove 64 and the annular concave portion 63 is provided to penetrate the first land portion 61 diagonally.

On the other hand, a cap 9 having a U-shaped cross section is screwed and fixed to the large-diameter portion 52 of the valve sleeve 5 with the opening portion facing the spool 6, and a spring A 10 is interposed between the cap 9 and the spool 6. I am wearing. One end of the spring A10 abuts the bottom surface of the cap 9, and the other end abuts the bottom surface of a recess 66 formed at the end of the second land portion 62 of the spool 6 to urge the spool 6 toward the solenoid body 7 side. ing.

The solenoid main body 7 that drives the spool 6 includes a coil 12 housed in the inner circumference of the bowl-shaped case 11 and a magnetic center post that is inserted and fixed in the inner circumference of the opening of the coil 12 on the spool 6 side. 13, a plunger 15 made of a magnetic material that is reciprocally inserted into the inner circumference of the other opening of the coil 12 coaxially with the center post 13 via a bearing 14, and a stopper that restricts the axial movement of the plunger 15. It is composed of a portion 16 and a washer-shaped plate 17 for connecting and fixing the case 11 and the stopper portion 16.

Then, the valve sleeve 5 is screwed into the annular protrusion 18 protruding from the bottom of the case 11, and the valve sleeve 5 and the solenoid body 7 are coaxially and integrally assembled.

The center post 13 has a cylindrical shape, and a rod 19 is reciprocally inserted in the inner periphery of the center post 13. The rod 19 is composed of a large diameter portion 19A and a small diameter portion 19B. The large diameter portion 19A is inserted into the inner circumference of the center post 13 and the small diameter portion 19B is inserted into a through hole 15A formed in the plunger 15. There is. The step between the large diameter portion 19A and the small diameter portion 19B abuts on the end surface of the plunger 15 so that the rod 19 is operatively connected to the plunger 15.

A recess 15 B is provided on the stopper 16 side of the plunger 15, and a spring B 20 is interposed between the recess 15 B and the stopper 16. One end of the spring B20 contacts the bottom surface of the recess 15B of the plunger 15 to urge the plunger 15 toward the spool 6 by the spring force of the spring B20. Therefore, the end surface of the large diameter portion 19A of the rod 19 that is operatively connected to the plunger 15 is in contact with the end surface of the spool 6.

On the other hand, the stopper portion 16 is formed with an outlet 16 A having a screw portion as an outlet for discharging the fluid inside the solenoid body 7 coaxially with the rod 19. Then, an adjuster 21 as a discharge flow rate adjusting means for adjusting the flow rate discharged from the blowout port 16A is screwed into the blowout port 16A. A slit 21A is provided on the outer peripheral portion of the adjusting nut 21, and the slit 21A is provided so that the fluid is discharged to the outside of the solenoid body 7 from the slit 21A.

When the solenoid body 7 is off, the spool 6 moves to the solenoid body 7 side by the spring force of the spring A10 provided on the side of the second land 62 of the spool 6. By moving in this way, the first land portion 61 moves to the solenoid 7 side, the supply port 2 opens, and the fluid is supplied to the control port 3 via the annular recess 63 of the spool 6. At this time, the fluid passes through the gap between the guide hole 8 of the valve sleeve 5 and the first land portion 61 of the spool 6, the gap between the inner periphery of the center post 13 and the outer periphery of the large diameter portion 19A of the rod 19, and the solenoid main body 7 Fluid accumulates inside. Then, the accumulated fluid passes through a passage 15C provided outside the through hole 15A of the plunger 15 in the radial direction, and is discharged to the outside of the solenoid main body 7 through the outlet 16A of the stopper 16 and the slit 21A of the adjusting nut 21. To be done.

Further, when the solenoid main body 7 is turned on, the plunger 15 is magnetically attracted to the center post 13, so that the rod 19 operatively connected to the plunger 15 is provided with the second land portion 62 of the spool 6 on the cap 9 side. The spool 6 is moved to the cap 9 side against the spring force of the spring A10. By moving in this way, the first land portion 61 closes the supply port 2, the second land portion 62 moves to the cap 9 side, the drain port 4 opens, and the spool 6 is restrained via the annular recess 63. The control fluid is discharged in communication with the control port 3.

The control pressure is introduced into the groove 64 through the communication passage 65 in the spool 6, and the introduced pressure is balanced with the suction force of the solenoid body 7 and the spring force of the spring A10. Controlled.

In the solenoid valve having the above-described configuration, the adjusting nut 21 having the slit 21A is screwed into the outlet 16A of the solenoid body 7, so that the flow passage area of the slit 21A is finely adjusted depending on the screwing amount. Yes, the amount of fluid discharged can be adjusted. Therefore, the flow rate of the fluid accumulated in the solenoid body 7 can be adjusted. As a result, the resonance frequency of the springs A, B10, 20 and the vibration of the spool 6 due to the fluid force generated between the guide hole 8 of the valve sleeve 5 and the spool 6 are generated without blocking the blowout port 16A on the back side of the plunger 15. It is possible to stabilize responsiveness while suppressing pulsation. Therefore, the hysteresis of the control pressure characteristic can be reduced. Therefore, it is possible to stably manufacture a solenoid valve having both damping and responsiveness.

In the above embodiment, the discharge flow rate adjusting means is described by taking as an example the one that adjusts the discharge area by adjusting the opening area of the slit 21A by adjusting the screwing amount of the adjust nut 21 through the slit 21A. The present invention is not limited to such a configuration, and a configuration such as a flow rate adjusting valve may be used as long as the flow rate to be discharged can be adjusted.

[0025]

[Effect of device]

 The present invention having the above-mentioned configuration and operation has the discharge flow rate adjusting means for adjusting the flow rate discharged from the discharge port for discharging the fluid accumulated in the solenoid main body to the outside of the solenoid main body. The flow rate of the fluid discharged to the outside of the solenoid body can be adjusted without blocking the discharge port that may damage the Therefore, the flow rate of the fluid accumulated in the solenoid body can be adjusted, and the responsiveness can be stabilized while suppressing the pulsation of the control pressure characteristic caused by the vibration due to the fluid force generated between the valve body and the spool.

[Submission date] January 25, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

The solenoid main body 107 is reciprocally inserted into the solenoid main body 107, and a plunger 108 made of a magnetic material, a cylindrical center post 109 made of a magnetic material magnetically attracting the plunger 108, and actuated by the plunger 108. A rod 110 that is connected and is reciprocally inserted in the inner circumference of the center post 109, a stopper portion 111 that regulates the axial movement of the plunger 108 and guides a magnetic path to the plunger 108 , and a stopper portion 111. It is provided with a discharge port 112 for discharging the fluid accumulated inside the provided solenoid body 107 to the outside.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Problems to be solved by the device]

However, in the case of the above-described conventional technique, when the solenoid body 107 is off, the supply port 101 is opened by the movement of the spool 106, and the fluid supplied into the valve body 104 has a gap between the valve body 104 and the spool 106. → Collected in the solenoid body 107 through the gap between the center post 109 and the rod 110, and the accumulated fluid is discharged to the outside of the solenoid body 107 through the passage 115 provided in the plunger 108 → the discharge port 112 of the stopper portion 111. To be done. At this time, the spring A1 13, the pulsation spool 106 is intense vibrations to occur by the fluid forces flowing between the power source frequency, further valve body 104 and the spool 106 to be applied to the resonance frequency and the solenoid body 107 of the spring B 114, hysteresis increases There are cases.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

[Action]

In the solenoid with the above configuration, since a discharge flow rate adjusting means for adjusting the flow rate discharged from the discharge port that discharges the fluid accumulated in the solenoid body to the outside of the solenoid body is provided, The flow rate of the fluid discharged to the outside of the solenoid body can be adjusted without blocking the discharge port. Therefore, the amount of fluid accumulated in the solenoid body can be adjusted, and the responsiveness can be stabilized while suppressing the pulsation caused by the vibration due to the fluid force generated between the valve body and the spool.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

The solenoid main body 7 that drives the spool 6 includes a coil 12 housed in the inner circumference of the bowl-shaped case 11 and a magnetic center post that is inserted and fixed in the inner circumference of the opening of the coil 12 on the spool 6 side. 13, the other Sentapo strike 13 coaxially with magnetic plunger 15 that is inserted reciprocably through a bearing 14 in the circumferential openings of the coil 12, thereby restricting the axial movement of the plunger 15 It is composed of a stopper portion 16 for guiding the magnetic path to the plunger 15 and a washer-shaped plate 17 for connecting and fixing the case 11 and the stopper portion 16.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

On the other hand, the stopper portion 16 is formed with an outlet 16 A having a screw portion as an outlet for discharging the fluid inside the solenoid body 7 coaxially with the rod 19. Then, an adjuster 21 as a discharge flow rate adjusting means for adjusting the flow rate discharged from the blowout port 16A is screwed into the blowout port 16A. This is the outer circumference of the adjustment nut 21 has a slit 21A, is adapted to discharge to the outside of the solenoid body 7 of fluid from that of the slit 21A.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

When the solenoid body 7 is off, the spool 6 moves to the solenoid body 7 side by the spring force of the spring A10 provided on the side of the second land 62 of the spool 6. By moving in this way, the first land portion 61 moves to the solenoid 7 side, the supply port 2 opens, and the fluid is supplied to the control port 3 via the annular recess 63 of the spool 6. At this time, the fluid passes through the gap between the guide hole 8 of the valve sleeve 5 and the first land portion 61 of the spool 6 and the gap between the inside of the center post 13 and the outer periphery of the large diameter portion 19A of the rod 19 to the inside of the solenoid body 7. two round. Then, the accumulated fluid passes through a passage 15C provided outside the through hole 15A of the plunger 15 in the radial direction, and is discharged to the outside of the solenoid main body 7 through the outlet 16A of the stopper 16 and the slit 21A of the adjusting nut 21. To be done.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Further, when the solenoid main body 7 is turned on, the plunger 15 is magnetically attracted to the center post 13, so that the rod 19 operatively connected to the plunger 15 receives the spring force of the spring A10 provided on the cap 9 side. anti to make move the spool 6 to the cap 9 side. By moving in this way, the first land portion 61 closes the supply port 2, the second land portion 62 moves to the cap 9 side, the drain port 4 opens, and the annular recess 63 of the spool 6 is inserted. The control fluid is discharged by communicating with the control port 3.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

[0022] The control pressure forces are introduced into the groove 64 through the communication passage 65 in the spool 6, caused by the area difference of the small diameter portion 51 and the land portion 61 of the introduced pressure and the spool 6 of its With this , the attraction force of the solenoid body 7 and the spring forces of the springs A10 and B20 are controlled while being balanced.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

In the solenoid valve configured as described above, the adjusting nut 21 having the slit 21A is screwed into the outlet 16A of the solenoid body 7, so that the flow passage area of the slit 21A is finely adjusted by the screwing amount. Yes, the amount of fluid discharged can be adjusted. Therefore, the amount of fluid accumulated in the solenoid body 7 can be adjusted. As a result, the pulsation generated by the resonance frequency of the springs A10 and B20 and the vibration of the spool 6 due to the fluid force generated between the guide hole 8 of the valve sleeve 5 and the spool 6 can be achieved without blocking the blowout port 16A on the back side of the plunger 15. The responsiveness can be stabilized while being suppressed. Therefore, the hysteresis of the control pressure characteristic can be reduced. Therefore, it is possible to stably manufacture a solenoid valve having both damping and responsiveness.

[Procedure Amendment 10]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025]

[Effect of device]

The present invention having the above-mentioned configuration and operation has the discharge flow rate adjusting means for adjusting the flow rate discharged from the discharge port for discharging the fluid accumulated in the solenoid main body to the outside of the solenoid main body. The flow rate of the fluid discharged to the outside of the solenoid body can be adjusted without blocking the discharge port that may damage the Therefore, the amount of the fluid accumulated in the solenoid body can be adjusted, and the responsiveness can be stabilized while suppressing the pulsation of the control pressure characteristic caused by the vibration due to the fluid force generated between the valve body and the spool.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a conventional solenoid valve.

[Explanation of symbols]

 1 Solenoid Valve 2 Supply Port 3 Control Port 4 Drain Port 5 Valve Sleeve (Valve Main Body) 51 Small Diameter Part 52 Large Diameter Part 6 Spool 61 First Land Part 62 Second Land Part 63 Annular Recess 64 Recessed Groove 65 Communication Passage 66 Recess 7 Solenoid body 8 Guide hole 9 Cap 10 Spring A 11 Case 12 Coil 13 Center post 14 Bearing 15 Plunger 15A Through hole 15B Recess 15C Passage 16 Stopper 16A Outlet port (Discharge port) 17 Plate 18 Projection 19 Rod 20 Spring B 21 Adjust Nut (discharging flow rate adjusting means) 21A slit

Claims (1)

[Scope of utility model registration request] 1. A valve main body having a guide hole inside and an inflow / outflow port, a spool slidably inserted into an inner circumference of the guide hole, and a solenoid main body for reciprocally driving the spool. The solenoid suction body is used to open and close the inflow / outflow port by moving the spool by using the electromagnetic attraction force, and a discharge port for discharging the fluid accumulated in the solenoid body to the outside of the solenoid body. A solenoid valve provided with a discharge flow rate adjusting means for adjusting a flow rate discharged from the discharge port.