JP5313118B2 - Motorized valve - Google Patents

Description

  The present invention relates to a motor-operated valve used in a hydraulic actuator such as a chair or bed used in, for example, barber / beauty or medical fields.

  Conventionally, hydraulic cylinders, which are hydraulic actuators for raising and lowering chairs for hairdressing and medical use, for tilting the backrest, and for raising and lowering and tilting the bed, have each hydraulic cylinder between the pump and the tank. A valve for adjusting the flow rate of the hydraulic oil supplied and discharged is arranged. As such a valve, for example, a proportional electromagnetic valve is known (see, for example, Patent Document 1).

JP-A-9-126348 (page 4-6, FIG. 1)

  In the case of a chair or bed used in the field of hairdressing or medical care, if the operation is not smooth, there is a risk of discomfort to the user. Therefore, in the valve, it is necessary to finely adjust the flow rate so as not to cause a rapid hydraulic pressure fluctuation in the hydraulic cylinder.

  However, the above-described proportional solenoid valve has a problem that such fine flow rate adjustment is not easy, and complicated control is required to realize such flow rate adjustment.

  In this regard, for example, although it is conceivable to use an electric valve that changes the opening by rotating a ball-shaped valve body by a motor as a drive source, the ball-shaped valve body not only increases the manufacturing cost, There is a problem that miniaturization of the motor-operated valve is not easy. There is also a problem that a loud fluid sound is generated.

  The present invention has been made in view of these points, and an object of the present invention is to provide a motor-operated valve capable of finely adjusting the flow rate without complicating the control while suppressing the manufacturing cost and enabling downsizing.

The motor-operated valve according to claim 1 includes a valve body including a fluid inflow port, a fluid outflow port, and a communication passage that communicates the inflow port with the outflow port, and a flow rate formed to intersect the axial direction. a through hole for controlling the one end side, communicating the amount of protrudes from the other end side of the valve body with one end is positioned within the valve body, and the through-hole by rotating said communication passage The cylindrical rod-shaped valve body that can adjust the opening degree of the communication passage by changing the angle, and the velocity of the fluid that is inserted and fitted from one end of the valve body and located in the through-hole, and passes through the through-hole A speed limiter that restricts fluid noise and restricts fluid noise, a drive source that outputs rotational force, and biases one of the drive source side and the other end side of the valve body toward the other. comprising a biasing means for coupling without play and the other end portion side of the valve body and the drive source side, the front The rotational force output from the driving source is obtained by including a connecting portion for transmitting to said valve body.

The motor-operated valve according to claim 2 is the motor-operated valve according to claim 1 , wherein the motor-operated valve is attached to the valve main body and supports a first end of the valve body, and the valve between the holding plate and the valve main body. And a sealing member fitted around one end of the body .

Electric valve 請 Motomeko 3 described in claim 1 or 2 motorized valve according drive source is one that is a stepping motor.

According to the first aspect of the present invention, the speed limiter is inserted and fitted from one end of the valve body located in the valve body, and the rotational force output from the drive source projects from the valve body of the cylindrical rod-shaped valve body. The flow rate can be finely adjusted by changing the amount of communication between the through hole and the communication path according to the amount of rotation of the valve body without complicating the control. Allowing a certain amount of fluid leakage at the time of closing, for example, the structure becomes simple compared to the case of using a ball-shaped valve body and seal material, etc., and the rotational force required for driving can be kept low. Suppression and downsizing are possible . Moreover, a fluid sound can be suppressed by restrict | limiting a speed by making the fluid which flows through a through-hole into a clearance gap flow with a speed limiting body. Further, the rotation output from the drive source is achieved by urging one of the drive source side and the valve element side toward the other by the urging means and connecting the drive source side and the valve element side without rattling. The rotation of the valve body can be made to follow the force with certainty, and the flow rate can be adjusted more accurately and finely .

According to invention of Claim 2, the circumference | surroundings of the one end part of the valve body supported by the holding plate attached to the valve main body can be sealed with a sealing member .

According to the invention 請 Motomeko 3, wherein the drive source by a stepping motor, the amount of rotation of the valve body can be more accurately finely adjusted.

It is a longitudinal cross-sectional view which shows the motor operated valve of one embodiment of this invention. It is a front view which shows an electrically operated valve same as the above. It is a disassembled perspective view of an electric valve same as the above. It is a perspective view which shows the principal part of an electrically operated valve same as the above. (a1) is a longitudinal sectional view showing the main part of the motor-operated valve in the fully closed state, (a2) is a longitudinal sectional view showing the main part in the fully-opened state of the motorized valve, and (b1) is an AA of (a1). Sectional drawing, (b2) is a BB sectional view of (a2). It is a graph which shows the flow characteristic of an electric valve same as the above. (a) is a hydraulic circuit diagram showing a part of one hydraulic system using the same motorized valve, (b) is a hydraulic circuit diagram showing a part of another hydraulic system using the same motorized valve, (c) is It is a hydraulic circuit diagram which shows a part of hydraulic system of a prior art example.

  The configuration of an embodiment of the present invention will be described below with reference to FIGS.

  1 to 3, reference numeral 11 denotes an electric proportional valve, which is an electric valve. The electric proportional valve 11 is a hydraulic valve that is used as a control valve for a hydraulic circuit such as a chair or a bed in the field of cosmetics or medicine, for example. It is an electric proportional valve. Here, as shown in FIG. 7C, in the hydraulic circuit, for example, a plurality of, for example, four flow paths 13a, 13b, 13c, and 13d are connected in parallel via a strainer 12 between a pump and a tank. ing. Relief valve 14 is connected to flow path 13a, and electromagnetic valves 21a, 21b, 21c, check valves 15a, 15b, 15c, variable throttle valves 22a, 22b, 22c, respectively, are connected to flow paths 13b, 13c, 13d. The solenoid valves 16a, 16b, 16c and the variable throttle valves 23a, 23b, 23c are connected in series, and a strainer is provided between the connection point between the variable throttle valves 22a, 22b, 22c and the solenoid valves 16a, 16b, 16c and the hydraulic cylinder. 17a, 17b, and 17c are connected. For example, as shown in FIG. 7A, the electric proportional valve 11 is connected to the hydraulic circuit between the flow paths 13a and 13b, that is, between the pump side and the tank side together with the strainer 24. As shown in (b), it is possible to connect between the hydraulic circuit and at least one of the strainers 17a, 17b, 17c (strainers 17a, 17b in the figure) and the hydraulic cylinder. .

  As shown in FIGS. 1 to 3, the electric proportional valve 11 includes a valve body 31, a spool 32 that is a valve body attached to the valve body 31, and a stepping motor 33 that is a drive source that outputs rotational force. And a shaft 34 which is a connecting portion for transmitting the rotational force of the stepping motor 33 to the spool 32.

  The valve body 31 is also referred to as a valve body, and an inlet 36 and an outlet 37 are formed on both side surfaces, and the inlet 36 and the outlet 37 are communicated with each other via a communication path 38. . Further, the valve body 31 is formed with a spool mounting hole 39 that is a valve body mounting hole for mounting the spool 32 so as to cross the communication path 38 and penetrate in the vertical direction. Further, a substantially cylindrical holding portion 41 is integrally formed on the upper portion of the valve body 31, and is a holding body for rotatably holding the upper side of the spool 32 inside the holding portion 41. An attachment recess 43 to which the substantially cylindrical holder 42 is attached is formed.

  A strainer (not shown) for removing dust from fluid such as hydraulic oil is attached to the inflow port 36 and the outflow port 37, respectively.

  A substantially cylindrical cover 48 that covers the periphery of the shaft 34 is attached to the outer periphery of the holding portion 41. Further, a main body mounting plate 49, which is a main body holding member for connecting the valve main body 31 side and the stepping motor 33 side, is disposed at the upper end of the cover 48. The main body mounting plate 49 is fixed to the valve main body 31 via a mounting screw (not shown).

  The holder 42 is fitted with an O-ring 54 that is an upper seal member that seals the gap with the spool 32 on the inner circumference on the lower end side, and seals the gap with the mounting recess 43 on the outer circumference on the lower end side. An O-ring 56 that is an external seal member is fitted.

  The spool 32 is formed in a vertically long rod shape as a whole, and includes a substantially cylindrical spool body 61 that is a valve body on the lower side, and is held by a holder 42 at the upper end of the spool body 61. A substantially cylindrical held portion 62 is integrally formed, and a spool connecting portion 63 that is a valve body connecting portion for connecting the spool 32 to the shaft 34 is formed at the upper end of the held portion 62, and A fitting portion 65 is formed at the lower end of the spool body 61 to fit an O-ring 64, which is a seal member, on the outer periphery. Further, at the lower part of the spool body 61, a mounting hole portion 67, which is a speed limiting body mounting hole portion to which the silencer rod 66 as a speed limiting body is mounted, extends along the central axis across the fitting portion 65 and the spool body 61. Is formed.

  The spool body 61 is formed with a round hole 71 that penetrates in the radial direction so as to intersect the mounting hole 67. The through hole 71 is disposed at a position corresponding to the communication path 38 with the spool 32 attached to the valve body 31, and the amount of communication with the communication path 38 changes as the spool 32 rotates. Is configured to do.

  The held portion 62 is smaller in diameter than the spool body 61 and is formed coaxially with the spool body 61 and inserted through the holder 42, and the O-ring 54 is fitted between the outer peripheral surface and the holder 42. It is worn. The held portion 62 has a lower end located at the bottom of the mounting recess 43 and an upper end projecting from the mounting recess 43 to above the valve body 31.

  The spool connecting portion 63 is formed by cutting out the upper end portion of the held portion 62 along the radial direction, and has a planar shape to which the tip of the fixing screw 76 as a fixing member is pressed.

  The fitting portion 65 is smaller in diameter than the spool body 61 and is formed coaxially with the spool body 61, and is fixed to the lower surface of the valve body 31 via screws 78, 78 so that the lower portion of the spool mounting hole 39 is formed. It is supported from below by a holder plate 79 which is a holding plate to be covered.

  The muffler rod 66 is a muffler rod base 81 that is a substantially cylindrical speed limiter base that is fitted into the mounting hole 67 of the spool 32, and a speed that is coaxially formed at the upper end of the muffler rod base 81. A muffler rod body 82 which is a restriction body is integrally provided. The silencing rod body 82 is formed in a substantially cylindrical shape having a small diameter with respect to the silencing rod base 81, and faces the through hole 71 of the spool 32 with the silencing rod 66 fixed to the mounting hole 67. ing. Therefore, a flow path 84 (FIG. 5) communicating with the through hole 71 is formed around the silencing rod body 82 between the inner peripheral surface of the mounting hole portion 67.

  The stepping motor 33 is electrically connected to a control unit (not shown) via a wiring (not shown), and the rotation angle is controlled according to a pulse signal from the control unit. Further, in this stepping motor 33, a motor mounting plate 87 which is a driving source fixing member is provided via a pair of screws 88, a pair of spring washers 89 (only one shown) and a pair of nuts 90. It is fixed.

  Here, each screw 88 is inserted into a circular hole-shaped insertion hole 87a (only one is shown) formed in the motor mounting plate 87, and the distal end side passes through these insertion holes 87a, The main body mounting plate 49 is inserted into an adjustment hole 49a formed in the opening, and is fixed to the lower side of the main body mounting plate 49 via the spring washer 89 and the nut 90.

  Here, each adjustment hole 49a is an arc-shaped long hole that is curved along the circumferential direction around the central axis of the spool 32, and the stepping motor 33 together with the motor mounting plate 87 with each nut 90 loosened. By rotating in the circumferential direction, each screw 88 slides along each adjustment hole 49a, and by tightening each nut 90 at a desired position, the fixing position in the circumferential direction of the stepping motor 33 with respect to the valve body 31 is set. It is adjustable.

  The shaft 34 is fixed integrally with the spool 32 via the fixing screw 76. The shaft main body 93 is formed in a substantially covered cylindrical shape, and the connection portion formed coaxially on the upper portion of the shaft main body 93. And a gear portion 94 that is a single unit. The shaft 34 is attached with a torsion spring 95 as urging means.

  The shaft body 93 is positioned above the holder 42, and the held portion 62 of the spool 32 is inserted from below. Further, a screwing hole 97, which is a communication hole communicating with the inside, is formed on a side portion of the shaft body 93, and the distal end side of the fixing screw 76 is screwed into the screwing hole 97. The shaft 34 and the spool 32 are configured to be integrally fixed by being pressed against the spool connecting portion 63 facing the inside of the hole 97.

  The gear portion 94 meshes with a motor gear portion which is a drive source side gear portion formed at the tip of a rotation shaft (not shown) of the stepping motor 33, whereby the rotational force output from the stepping motor 33 is applied to the spool 32. Communication is possible.

  Further, the torsion spring 95 biases the shaft 34 in a predetermined direction along the circumferential direction, thereby eliminating a circumferential clearance (backlash or clearance) between the gear portion 94 and the motor gear portion, thereby This is to eliminate an error in opening when opening and closing (FIG. 6). As shown in FIG. 4, the torsion spring 95 has one end engaged with a head 76a of a fixing screw 76 screwed into the screw hole 97 and the other end connected to the valve body 31. It is engaged with the parallel pin 98 which is an engaging part fixed to.

  The parallel pin 98 has a lower end side inserted into a hole 99 formed in the edge portion of the holding portion 41 and an upper end side protruding above the valve body 31.

  Next, the operation of the above embodiment will be described.

  In the electric proportional valve 11, the rotation angle of the stepping motor 33 shown in FIG. 1 is controlled in accordance with a pulse signal from a control unit (not shown) (FIG. 6). Therefore, the spool 32 integrally connected to the shaft 34 is rotated in the circumferential direction via the shaft 34 by the engagement of the motor gear portion of the rotation shaft of the stepping motor 33 and the gear portion 94 of the shaft 34. The amount of communication between the through hole 71 of the shaft 34 and the communication path 38 changes according to the number of pulse signals (number of pulses) supplied to the stepping motor 33, that is, the opening degree of the communication path 38 is adjusted. Is done.

  At this time, since a circumferential load is applied to the shaft 34 by the torsion spring 95, backlash (clearance) between the motor gear portion of the rotating shaft of the stepping motor 33 and the gear portion 94 of the shaft 34 is eliminated, and the stepping motor 33 Regardless of the rotation direction of the rotation shaft, the rotation of the shaft 34 follows this rotation without rattling. That is, there is almost no error (hysteresis) in the opening between the valve opening and the valve closing (FIG. 6).

  Then, by adjusting the opening of the communication path 38 as described above, the flow rate of fluid such as hydraulic oil is controlled, and the speed of the hydraulic cylinder or the like is controlled.

  For example, FIG. 5 (a1) and FIG. 5 (b1) show the fully closed state of the electric proportional valve 11, and FIG. 5 (a2) and FIG. 5 (b2) show the fully opened state of the electric proportional valve 11. .

  In the state where the electric proportional valve 11 is opened, the fluid flows from the inflow port 36 to one end side of the through hole 71 through one end side of the communication path 38. At this time, since the silencing rod main body 82 of the silencing rod 66 faces the through hole 71, the fluid collides with the silencing rod main body 82 and its flow velocity is reduced. Then, the fluid passes through the flow path 84 around the muffler rod main body 82 and passes from the other end side of the through hole 71 to the outlet 37 through the other end side of the communication path 38. In this manner, the flow rate of the fluid is reduced by the silencing rod 66, so that the sound generated when the fluid passes is reduced.

  As described above, according to the embodiment, the rotational force output from the stepping motor 33 is transmitted to the rod-shaped spool 32 via the shaft 34, and the amount of rotation of the spool 32 can be adjusted without complicating the control. Accordingly, the amount of communication between the through hole 71 and the communication passage 38 can be changed to finely adjust the flow rate, and fluid leakage when the valve is closed is allowed to some extent. For example, a ball-shaped valve body and a sealing material (such as an O-ring) ) Etc., the structure is simple and the rotational force (rotational torque) required for driving can be kept low, so that the stepping motor 33 can have a small output, that is, a small one. The manufacturing cost can be reduced and the size can be reduced. In addition, when the seal | sticker at the time of valve closing is required, it can respond by using another valve together.

  Further, by using the silencing rod 66 disposed in the through hole 71 of the spool 32, the fluid noise can be suppressed by limiting the speed by using the fluid flowing through the through hole 71 as a gap flow.

  Furthermore, the spool 34 side, that is, the shaft 34 integrally connected to the spool 32 is urged toward the stepping motor 33 side, and the gear portion 94 of the shaft 34 and the motor gear portion of the rotating shaft of the stepping motor 33 are connected. By connecting without rattling, the rotation of the spool 32 can reliably follow the rotational force output from the stepping motor 33, and more accurate and fine flow rate adjustment can be achieved.

  In particular, when the electric proportional valve 11 is used as a control valve for a hydraulic circuit such as a chair or bed in the hairdressing or medical field, the user is inconvenienced when the hydraulic fluid flow rate changes suddenly and the hydraulic cylinder speed changes suddenly. Since there is a possibility of giving a pleasant feeling, the electric proportional valve can be used as a control valve for a hydraulic circuit such as a chair or a bed in the hairdressing or medical field by enabling fine adjustment of the flow rate of the fluid without rattling as described above. 11 can be suitably used.

  Further, as shown in FIG. 7 (a), all hydraulic cylinders can be controlled by connecting the electric proportional valve 11 to the pump side and the tank side, and as shown in FIG. 7 (b), By connecting the electric proportional valve 11 between at least one of the strainers 17a, 17b, and 17c and the hydraulic cylinder, the hydraulic cylinder can be individually controlled.

  Then, by using the stepping motor 33 whose rotation angle can be finely adjusted according to the number of pulses as a drive source, the rotation amount of the spool 32 can be finely adjusted with higher accuracy.

Note that, in the embodiment described above, collected by Shon spring 95 may bias the stepping motor 33 side in the circumferential direction to the spool 32 side.

  Further, as the urging means, it is possible to use something other than the torsion spring 95, and as the drive source, it is possible to use something other than the stepping motor 33.

11 Electric proportional valve
31 Valve body
32 Spool that is a disc
33 Stepping motor as drive source
34 Shaft as connecting part
36 Inlet
37 Outlet
38 passage
64 O-ring which is a sealing member
66 Silencer rod as speed limiter
71 Through hole
79 Holder plate as a holding plate
95 Torsion spring as biasing means

Claims (3)

A valve main body including a fluid inlet, a fluid outlet, and a communication path that connects the inlet and the outlet;
A through hole for flow control which is formed to cross the axial direction on one end side, the through protrudes, by rotating the outer other end of the valve body with one end is positioned within the valve body A cylindrical rod-shaped valve element capable of adjusting the opening of the communication path by changing the amount of communication between the hole and the communication path;
A speed limiter that is inserted and fitted from one end of the valve body and is positioned in the through hole, restricts the speed of fluid passing through the through hole, and suppresses fluid noise;
A drive source that outputs rotational force;
By attaching one of the drive source side and the other end side of the valve body toward the other side, the drive source side and the other end side of the valve body are connected without rattling . A motor-operated valve comprising: a connecting portion that includes a biasing means and transmits a rotational force output from the drive source to the valve body. A holding plate attached to the valve body and supporting one end of the valve body;
A seal member fitted around one end of the valve body between the holding plate and the valve body;
The motor-operated valve according to claim 1, comprising: The motor-driven valve according to claim 1 or 2 , wherein the drive source is a stepping motor.

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