JP2009097622A - Solenoid valve structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid valve structure capable of preventing malfunction caused by reduction in fixing force, by preventing leakage from a clearance when closing a valve, while reducing cost. <P>SOLUTION: A first screw part 52 is formed in a large diameter part 51 of a valve chest forming member 31 storing a valve element 25, and a second screw part 53 is formed in a projection part 24 of a motor base 21, and the valve chest forming member 31 is installed on the motor base 21. A position of a valve seat 42 to the valve element 25 can be varied in response to a screwing-in quantity of the valve chest forming member 31 to the projection part 24. An O ring 63 is arranged between a base end surface 61 of the large diameter part 51 and an opposed part 62 of the motor base 21, and a rotation stopper 71 is arranged on the tip of the valve chest forming member 31. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solenoid valve structure of a solenoid valve that controls flow.

  Conventionally, when an air flow rate is controlled in an air circuit, an electromagnetic valve has been used (for example, Patent Document 1).

  As this electromagnetic valve, the one shown in FIG. 2 is known, and the electromagnetic valve 801 is constituted by a step motor 802 constituting a drive unit and a case 803 provided in the step motor 802. An operating shaft 804 extends from the step motor 802 so as to be movable in the axial direction, and a valve body 805 is provided at the tip of the operating shaft 804.

  The case 803 is provided with a fixing portion 811 fixed to the step motor 802 and a cylindrical portion 812 extending from the fixing portion 811, and the cylindrical portion 812 is provided on the operating shaft 804. The valve body 805 is movably surrounded.

  An input port 821 communicating with the inside is formed on the peripheral surface of the cylindrical portion 812, and an opening at the tip of the cylindrical portion 812 constitutes an output port 822. A female screw part 823 is formed on the inner side surface of the cylindrical part 812 on the tip side from the input port 821, and a male screw part 825 formed on the outer peripheral surface of the valve seat constituting member 824 is formed in the female screw part 823. It is screwed. Accordingly, the valve seat constituting member 824 is attached to the cylindrical portion 812 of the case 803 in a state of being fitted therein.

  A valve seat 831 protruding inward is formed on the base end side of the valve seat constituting member 824 located on the step motor 802 side, and the operating shaft 804 of the step motor 802 is formed on the valve seat 831. The valve body 805 provided on the seat is configured to be seated. As a result, the valve body 805 is moved by the step motor 802 and the separation distance from the valve seat 831 is varied, so that the air flowing out from the input port 821 to the output port 822 through the valve chamber 841 is changed. The flow rate can be controlled.

  As a result, the case 803 of the electromagnetic valve 801 is inserted into the mounting hole 852 provided in the block 851, and the tip of the cylindrical portion 812 provided in the case 803 is connected to the outflow path on the back side of the mounting hole 852. By fixing in a state of being connected to 853, the flow rate of air flowing from the inflow path 854 of the block 851 to the outflow path 853 can be controlled.

  In this electromagnetic valve 801, the relationship between the valve opening degree corresponding to the operating position of the operating shaft 804 and the air flow rate passing therethrough can be adjusted by the screwing amount of the valve seat component 824 into the cylindrical portion 812. The screwing amount is adjusted so that a desired air flow rate can be obtained at a predetermined valve opening at the time of assembly.

  That is, after the valve seat constituent member 824, in which an adhesive is applied to the male screw portion 825, is screwed into the cylindrical portion 812 of the case 803, the electromagnetic valve 801 is attached to the block 851, and the air flow rate is measured. Then, by repeatedly adjusting the screwing amount of the valve seat component 824 to the cylindrical portion 812 and measuring the air flow rate with the adjusted electromagnetic valve 801 attached to the block 851, a predetermined valve is obtained. After adjusting the opening so that a desired air flow rate is obtained, the adhesive is thermoset to fix the valve seat component 824 to the case 803.

At this time, the air supplied to the valve chamber 841 is caused by the pressure difference between the valve chamber 841 and the valve seat downstream region downstream of the valve seat 831, and the male thread portion 825 of the valve seat component 824 and the valve seat 841. An attempt is made to flow to the outflow passage 853 through a gap between the female threaded portions 823 of the cylindrical portion 812. This flow is formed on the peripheral surface of the valve seat constituting member 824 as shown in FIG. The projection 861 is configured so as to be prevented.
Japanese Patent Laid-Open No. 8-049774

  However, in such a solenoid valve structure, the adhesive between the male screw portion 825 of the valve seat component 824 and the female screw portion 823 of the case 803 is applied to the valve seat component 824 when negative pressure is applied to the outflow passage 853. The projection 861 may flow out from the gap between the inner surface of the case 803.

  In this case, there is a concern that the fixing force of the valve seat constituting member 824 to the case 803 may be reduced.

  Further, when a gap is generated between the male screw portion 825 and the female screw portion 823, air in the valve chamber 852 flows out to the downstream region of the valve seat through the gap, and air leaks when the valve is closed. The amount can be large.

  Further, since the screwing amount of the valve seat constituent member 824 cannot be adjusted while applying a negative pressure, it is necessary to repeatedly mount and remove the electromagnetic valve 801, which takes time. As a result, the assembly time becomes longer and the manufacturing cost increases.

  The present invention has been made in view of such a conventional problem, and while preventing cost reduction, prevents leakage from a gap at the time of valve closing, and prevents problems caused by a decrease in fixing force. An object of the present invention is to provide an electromagnetic valve structure capable of performing

  In order to solve the above problems, in the electromagnetic valve structure of the present invention, an input port for inputting fluid into the valve chamber is provided in an enclosure portion that surrounds the valve body extending from the drive portion to form a valve chamber. In an electromagnetic valve structure in an electromagnetic valve provided with a valve seat on which the valve body separates and attaches, and an output port for outputting fluid in the valve chamber through a gap formed between the valve seat and the valve body The surrounding portion is constituted by a valve chamber forming member having an opening for inserting the valve body opened at a base end, and the valve chamber forming member is engaged with a jig to rotate the valve chamber forming member. A second screw that is provided with a detent portion to prevent and that forms a first threaded portion at the base end portion of the valve chamber forming member and that is screwed into the drive portion with the first threaded portion of the valve chamber forming member The position of the valve seat of the valve chamber forming member with respect to the valve body that forms a part and extends from the drive part It is configured to be variable according to the screwing amount of the forming member into the driving portion, and at least the screwing amount between the base end surface of the valve chamber forming member and the facing portion of the driving portion facing the base end surface In the adjustment range, a ring-shaped seal member having elasticity that is in close contact with the base end face and the facing portion is disposed along the base end face.

  That is, when assembling the electromagnetic valve while adjusting, for example, a thermosetting adhesive is applied to the first screw portion of the valve chamber forming member or the second screw portion of the drive portion, and the valve body of the drive portion is Inserting into the opening of the base end of the valve chamber forming member, and screwing the first screw portion formed at the base end of the valve chamber forming member and the second screw portion provided in the drive unit, The valve chamber forming member is screwed into the drive unit. Then, the valve chamber forming member of the electromagnetic valve is inserted into a mounting hole provided in the block, the electromagnetic valve is set in the block, and a jig is engaged with the rotation stopper of the valve chamber forming member. The valve chamber forming member is prevented from rotating.

  In this state, fluid is supplied to the mounting hole from the inflow passage provided in the block, and fluid is input from the input port of the valve chamber forming member into the valve chamber in the valve chamber forming member, While measuring the relationship between the valve opening based on the amount of movement of the valve body by driving the valve body and the flow rate of the fluid from the outflow passage of the block, the valve chamber forming member to the drive unit Variable screwing amount.

  At this time, the valve chamber forming member is prevented from rotating by the jig. For this reason, for example, by rotating the drive part exposed from the block, the drive part and the valve chamber forming member are relatively rotated, and the screwing amount is varied.

  Then, according to this screwing amount, the position of the valve seat of the valve chamber forming member with respect to the valve body extending from the drive unit is varied, and the flow rate with respect to the valve opening is changed. Therefore, the screwing amount is adjusted so that a desired flow rate is obtained at a predetermined valve opening, and the screwing amount of the valve chamber forming member with respect to the drive unit is determined.

  At this time, the two screw portions to which the adhesive is applied are provided at a connection portion between the driving portion and the valve chamber forming member, and the valve chamber and the valve seat downstream region downstream from the valve seat. It is arrange | positioned in the position which is not influenced by the pressure difference which arises between.

  For this reason, even if it is at the time of the adjustment operation | work which adjusts the said screwing amount, supplying the fluid from the said input port, the outflow of the adhesive agent from the said both screw parts is suppressed.

  Further, an elastic ring-shaped sealing member that is in close contact with the base end surface and the facing portion is disposed between the base end surface of the valve chamber forming member and the facing portion of the driving unit facing the base end surface. The valve chamber and the outside of the valve chamber via the both screw portions are sealed by the seal member.

  Thereby, the outflow of the adhesive between the screw parts to the outside is surely prevented.

  And while removing a jig | tool from the said valve chamber formation member and thermosetting the said adhesive agent, the said valve chamber formation member is fixed to the said drive part.

  As described above, in the solenoid valve structure of the present invention, the amount of screwing of the valve chamber forming member into the drive unit is determined while supplying a fluid to the solenoid valve and measuring the relationship between the valve opening degree and the flow rate. Can do.

  For this reason, adjustment work while supplying fluid is not possible, so the assembly time can be shortened compared to the conventional case where assembly is performed by repeating the installation / removal work and adjustment work of the solenoid valve. Manufacturing costs can be reduced. Thereby, cost reduction can be achieved.

  And at the time of this assembly | attachment, the outflow of the adhesive agent between the 1st thread part of the said valve chamber formation member and the 2nd thread part of the said drive part can be prevented reliably.

  For this reason, compared with the case where the said adhesive agent flows out, the fixing force of the said valve chamber formation member to the said drive part can be maintained as designed. Thereby, reliability can be improved.

  Moreover, the said both thread part is set to the connection part of the said drive part and the said valve chamber formation member.

  For this reason, even if the adhesive flows out and a gap is formed between the two screw portions, the both screw portions are closed as compared with the conventional case where the both screw portions are set between the valve chamber and the valve seat downstream region. It is possible to reliably prevent a problem that sometimes the fluid in the valve chamber leaks to the valve seat downstream region through the gap between the screw portions. Thereby, increase of the leakage amount at the time of valve closing can be prevented.

  Then, the adhesive flows out between the two screw portions by the sealing effect of the seal member disposed between the base end surface of the valve chamber forming member and the facing portion of the drive unit facing the base end surface. Can be reliably prevented, and leakage of the fluid supplied into the valve chamber can also be reliably prevented.

  Therefore, it is possible to prevent the leakage from the gap when the valve is closed while reducing the cost, and it is possible to prevent the trouble caused by the decrease in the fixing force.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a solenoid valve 1 having a solenoid valve structure according to the present embodiment. The solenoid valve 1 controls the air flow rate in the air circuit, and FIG. 1 shows a state where the solenoid valve 1 is attached to a block 2 in which the air circuit is formed.

  The electromagnetic valve 1 includes a step motor 11 as a drive unit. A coil 13 is accommodated in the casing 12 of the step motor 11, and a rotor 14 is rotatably held inside the coil 13. A male screw 17 of an operating shaft 16 is screwed into a female screw 15 formed at the center of the rotor 14, and a tip end portion of the operating shaft 16 is configured to extend from the casing 12.

  The opening of the casing 12 is closed by a plate-like motor base 21, and the distal end portion of the rotor 14 is rotatably supported on the base end surface side of the motor base 21 via a bearing 22. Yes. A circular ring-shaped ridge 23 is formed on the front end surface of the motor base 21, and a columnar protrusion 24 higher than the ridge 23 is formed inside the ridge 23.

  The distal end portion of the operating shaft 16 is inserted through the protruding portion 24 and is configured to extend from the protruding portion 24 toward the distal end side. The distal end portion of the operating shaft 16 is formed, for example, in a D-shaped cross section, and the insertion hole of the projecting portion 24 through which the distal end portion is inserted is also formed in a D-shaped cross section. Stop is configured. A valve body 25 is provided at the distal end of the operating shaft 16, and a base end portion of the valve body 25 is guided by a guide groove 26 formed in the protruding portion 24.

  As a result, when the coil 14 of the step motor 11 is energized and the rotor 14 is rotated, the operation shaft 16 that is prevented from rotating in accordance with the rotation direction moves in the axial direction. The valve body 25 provided on the operating shaft 16 can be moved in the axial direction.

  A valve chamber forming member 31 that constitutes a surrounding portion of the valve body 25 extending from the step motor 11 is attached to the motor base 21 of the step motor 11. The valve chamber forming member 31 is formed in a cylindrical shape, and the valve body 25 is inserted from a base end opening. Accordingly, the valve chamber forming member 31 is configured to surround the valve body 25, and a valve chamber 32 that movably accommodates the valve body 25 is formed in the valve chamber forming member 31. Has been.

  On the peripheral surface of the valve chamber forming member 31, input ports 41,... For inputting air as a fluid into the valve chamber 32 are provided at a plurality of locations. On the side, a valve seat 42 from which the valve body 25 is seated is formed so as to protrude inward. Moreover, the opening part opened to the front-end | tip of the said valve chamber formation member 31 comprises the output port 43, and the air which flowed into the said valve chamber 32 is formed between the said valve seat 42 and the said valve body 25. It is configured to be able to output from the output port 43 through a gap.

  The base end portion of the valve chamber forming member 31 is formed with a large diameter, and a first screw portion 52 is formed on the inner peripheral surface of the large diameter portion 51. On the outer peripheral surface of the protruding portion 24 of the motor base 21 to which the large diameter portion 51 is connected, a second screw portion 53 that is screwed with the first screw portion 52 of the valve chamber forming member 31 is formed. The valve chamber forming member 31 can be connected to the step motor 11 by screwing the first screw portion 52 of the valve chamber forming member 31 into the second screw portion 53 of the projecting portion 24. It is configured.

  Accordingly, the valve seat of the valve chamber forming member 31 with respect to the valve body 25 extended from the step motor 11 according to the screwing amount of the valve chamber forming member 31 into the protruding portion 24 of the step motor 11. The position of the valve seat 42 can be varied, and the fixed position of the valve seat 42 can be adjusted.

  Between the base end surface 61 of the large-diameter portion 51 and the facing portion 62 of the motor base 21 facing the base end surface 61, an O-ring 63 as a ring-shaped seal member extends along the base end surface 61. It is arranged. The O-ring 63 is made of an elastic member such as a synthetic resin, and at least the valve body 25 and the valve seat 42 in a state where the valve chamber forming member 31 is attached to the protruding portion 24 of the motor base 21. In the adjustment range of the screwing amount when the position adjustment is performed, the base end face 61 and the opposing portion 62 are elastically in close contact with each other.

  Here, the allowable leakage rate of the O-ring 63 is 5 to 30%, and the O-ring 63 is in close contact with the base end face 61 and the facing portion 62 within this range. Further, an adjustment range of the screwing amount, that is, an adjustment position range of the valve seat 42 is set within this range.

  On the other hand, groove-shaped detents 71,... Are recessed at equal intervals on the inner surface at the tip of the valve chamber forming member 31, and these detents 71,. It is comprised so that it can engage with the latching claws 73 provided in the tool 72. Thereby, by using the jig 72, the valve chamber forming member 31 can be prevented from rotating.

  Further, a stepped portion 81 projecting sideways is formed along the outer peripheral surface at the distal end portion of the valve chamber forming member 31. A ring groove 82 is formed in the step portion 81, and an O-ring 83 is attached to the ring groove 82.

  In the electromagnetic valve 1, the valve chamber forming member 31 is inserted from an attachment hole 101 formed in the block 2, and the protruding portion 23 of the motor base 21 is formed in a ring-shaped step portion 102 formed in the block 2. In this attached state, the tip of the valve chamber forming member 31 is fitted into the outflow passage 103 provided on the tip side of the mounting hole 101. The O-ring 83 of the stepped portion 81 can be sealed.

  When a negative suction pressure is applied to the outflow passage 103 of the block 2, air is introduced into the mounting hole 101 through the inflow passage 111 opened to the atmosphere. The air supplied to the mounting hole 101 is output from the outflow passage 103 via the input ports 41 of the valve seat constituting member 31 of the electromagnetic valve 1, the valve chamber 32 and the output port 43. It is comprised so that.

  In the present embodiment according to the above configuration, when the electromagnetic valve 1 is assembled while adjusting, for example, a thermosetting adhesive is applied to the first screw portion 52 of the valve chamber forming member 31 or the motor base of the step motor 11. The valve body 25 of the step motor 11 is inserted into the opening of the base end of the valve chamber forming member 31 and formed at the base end of the valve chamber forming member 31. The first screw portion 53 and the second screw portion 53 provided on the step motor 11 are screwed together, and the valve chamber forming member 31 is screwed into the step motor 11.

  Then, the valve chamber forming member 31 of the electromagnetic valve 1 is inserted into the mounting hole 101 provided in the block 2, and the electromagnetic valve 1 is set in the block 2. Next, the jig 72 is inserted into the outflow passage 103 from the side of the block 2, and the engaging claws 73 of the jig 72 are prevented from rotating 71 of the valve chamber forming member 31. And the rotation of the valve chamber forming member 31 is prevented.

  In this state, by applying a suction negative pressure to the outflow passage 103, air as a fluid is sucked into the mounting hole 101 from the inflow passage 111 of the block 2 opened to the atmosphere, and the valve chamber forming member 31. , Based on the amount of movement of the valve body 25 by driving the valve body 25 with the step motor 11 while inputting air into the valve chamber 32 in the valve chamber forming member 31. While measuring the relationship between the valve opening and the flow rate of air from the outflow passage 103 of the block 2, the screwing amount of the valve chamber forming member 31 into the step motor 11 is varied.

  At this time, the valve chamber forming member 31 is prevented from rotating by the jig 72. For this reason, by rotating the casing 12 of the step motor 11 exposed from the block 2, the step motor 11 and the valve chamber forming member 31 are relatively rotated to vary the screwing amount.

  Then, according to this screwing amount, the position of the valve seat 42 of the valve chamber forming member 31 with respect to the valve body 25 extended from the step motor 11 is displaced, and the air flow rate with respect to the valve opening changes. Therefore, the screwing amount is adjusted so that a desired air flow rate is obtained at a predetermined valve opening, and the screwing amount of the valve chamber forming member 31 with respect to the step motor 11 is determined.

  Thus, the screwing amount of the valve chamber forming member 31 to the step motor 11 can be determined while supplying air to the electromagnetic valve 1 and measuring the relationship between the valve opening and the air flow rate.

  For this reason, adjustment work while supplying air is not possible, so the assembly time is shortened compared to the conventional method in which assembly was performed while repeating the installation / removal work and adjustment work of the solenoid valve. Manufacturing cost can be reduced. Thereby, cost reduction can be achieved.

  At this time, the two screw portions 52 and 53 to which the adhesive is applied are provided at a connection portion between the step motor 11 and the valve chamber forming member 31, and are downstream from the valve chamber 32 and the valve seat 42. It is arranged at a position where it is not affected by the pressure difference generated with the downstream valve seat region.

  For this reason, even during the adjustment operation for adjusting the screwing amount while supplying air from the input ports 41,..., The adhesive flows out of the screw parts 52, 53 due to the pressure difference. It is suppressed.

  Further, between the base end surface 61 of the valve chamber forming member 31 and the facing portion 62 of the step motor 11 facing the base end surface 61, there is elasticity that is in close contact with the base end surface 61 and the facing portion 62. A ring-shaped O-ring 63 is disposed, and the inside of the valve chamber 32 and the outside of the valve chamber 32 via the both screw portions 52 and 53 are sealed by the O-ring 63.

  Thereby, the outflow of the adhesive between the screw parts 52 and 53 to the outside is surely prevented.

  Then, while removing the jig 72 from the valve chamber forming member 31, the valve chamber forming member 31 is fixed to the step motor 11 by thermosetting the adhesive or the like.

  Thus, at the time of this assembly, since the outflow of the adhesive between the first screw portion 52 of the valve chamber forming member 31 and the second screw portion 53 of the step motor 11 can be reliably prevented, the bonding Compared to the case where the agent flows out, the fixing force of the valve chamber forming member 31 to the step motor 11 can be maintained as designed. Thereby, fixing force can be stabilized and reliability can be improved.

  Further, both the screw portions 52 and 53 are set at a connection portion between the step motor 11 and the valve chamber forming member 31. For this reason, even if the adhesive flows out and a gap is formed between the screw parts 52 and 53, both the screw parts 52 and 53 are set between the valve chamber 32 and the valve seat downstream region. As compared, it is possible to reliably prevent the problem that the air in the valve chamber 32 leaks to the valve seat downstream region through the gap between the screw parts 52 and 53 when the valve is closed. Thereby, increase of the leak amount at the time of valve closing can be prevented, and the air flow rate at the time of valve closing can be stabilized.

  Then, due to the sealing effect of the O-ring 63 disposed between the base end surface 61 of the valve chamber forming member 31 and the facing portion 62 of the step motor 11 facing the base end surface 61, the both screw portions 52, It is possible to reliably prevent the adhesive from flowing out between the spaces 53 and to prevent leakage of the air supplied into the valve chamber 32 to the outside.

  Therefore, it is possible to prevent the leakage from the gap when the valve is closed while reducing the cost, and it is possible to prevent the trouble caused by the decrease in the fixing force.

It is sectional drawing which shows one embodiment of this invention. (A) is sectional drawing which shows the conventional solenoid valve, (b) is the A enlarged view of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Block 11 Step motor 25 Valve body 31 Valve chamber formation member 32 Valve chamber 41 Input port 42 Valve seat 43 Output port 52 1st screw part 53 2nd screw part 61 Base end face 62 Opposite part 63 O-ring 71 Non-rotating 72 Jig

Claims (1)

An enveloping portion that surrounds the valve body extending from the drive unit to form a valve chamber, an input port for inputting fluid into the valve chamber, a valve seat on which the valve body is separated and seated, the valve seat and the valve In the electromagnetic valve structure in the electromagnetic valve provided with an output port that outputs the fluid in the valve chamber through a gap formed between the bodies,
The surrounding portion is constituted by a valve chamber forming member having an opening for inserting the valve body at the base end, and the valve chamber forming member is engaged with a jig to prevent the valve chamber forming member from rotating. While providing a detent portion to be formed and forming the first threaded portion at the base end portion of the valve chamber forming member,
A position of the valve seat of the valve chamber forming member with respect to the valve body extended from the drive portion by forming a second screw portion to be screwed with the first screw portion of the valve chamber forming member in the drive portion. While being configured to be variable according to the screwing amount of the valve chamber forming member into the drive unit,
Between the base end surface of the valve chamber forming member and the facing portion of the driving portion facing the base end surface, a ring shape having elasticity that closely contacts the base end surface and the facing portion in at least the adjustment range of the screwing amount An electromagnetic valve structure characterized in that a sealing member is arranged along the base end face.

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