JP4891876B2 - Flow control valve - Google Patents

Description

  The present invention is a flow rate adjusting valve connected to a hydraulic circuit such as a hairdressing chair, a dental chair, an operating table, etc., and energizing a coil of a plunger for raising / lowering speed of a chair or an operating table and raising / lowering motion of a backrest Further, the present invention relates to a flow rate adjusting valve that is slower than the normal speed and that is set to a normal speed by not energizing the coil.

As an example of a conventional flow rate adjusting valve, for example, there is an invention disclosed in JP-A-9-126348. This invention is a proportional solenoid valve that adjusts the amount of oil from the inflow side port to the outflow side port by adjusting the amount of current to the coil of the electromagnet. Not only to change the speed, but also to reduce the amount of oil by reducing the amount of current supplied to the coil at the start and stop of starting up and down of a hairdressing chair etc., decreasing the flow rate and increasing the speed This is to reduce the shock at the start and stop, and to prevent the supply of oil from the inflow side port to the outflow side port when the electromagnet coil is not energized. It was.
JP-A-9-126348

  By the way, in the above-described invention, not only the adjustment of the flow rate at the time of ascent and descent, but also the impact on the subject who is seated at the start of start and at the start and stop, The cost is high due to the complexity of the parts and the high accuracy of the parts, and the normal part, the elderly, and the handicapped are able to switch between raising and lowering the seat at a normal speed and raising and lowering the seat at a lower speed than the normal speed. Alternatively, when speed switching is performed with a child, there is a problem that the control becomes complicated.

  The present invention is intended to solve the above-mentioned problems, and the object of the present invention is suitable for a healthy person by raising and lowering a seat in a chair or the like at a normal speed without energizing the coil of the plunger. Speed control is performed, and energization of the coil causes the seat to move up and down at a lower speed than normal speed, making it suitable for elderly people, disabled people, and children, making gentle movements, and feeling of fear The purpose is to provide a flow control valve that is not given.

  The flow regulating valve according to the present invention achieves the above-mentioned object, and the means of claim 1 is characterized in that the first and second large-diameter ports are provided on the oil inflow side and the outflow side oil passage. 1. When the second orifice is formed and the coil is not energized, an oil passage is formed by the first and second ports and the first and second orifices. When the coil is energized, it is fixed against the spring force of the spring. A bulging portion formed at the tip of the plunger sucked by the child closes the first or second port by the flow of oil, and the inflow side or the outflow side only through the first orifice or the second orifice. It is characterized by being sent out from the oil passage.

  According to a second aspect of the present invention, there is provided a coil, a plunger that is attracted to the stator against the spring force of the spring when the coil is energized, and a bulge is formed at the lower end that extends from the lower surface of the plunger. A valve body, a valve body in which the valve body is inserted and a bulge portion having a size capable of being displaced in the horizontal direction is formed, and a position between the valve body of the valve body is formed A pair of oil passages for inflow and outflow of the oil, and a large-diameter first and second ports and a small-diameter first and second orifice formed at the boundary between each oil passage and the valve stem chamber And when the coil is not energized, the bulging portion of the valve stem is located away from the first and second ports, and the first and second ports and the first and second orifices are made to flow of oil. If the coil is energized and the hydraulic cylinder is raised, the bulging part of the valve stem When the oil is supplied to the hydraulic cylinder only from the second orifice by closing the second port in the direction, and the hydraulic cylinder etc. is lowered, the first port in the direction in which the oil flows is closed and oil is supplied from the first orifice only to the oil tank side. It is characterized by being returned.

  According to a third aspect of the present invention, in the above-described first or second aspect, the diameter of the first orifice is formed larger than the diameter of the second orifice, and the hydraulic pressure by the weight of the seated person when descending is increased. Even if it is smaller than the hydraulic pressure at the time of driving, it is lowered at substantially the same speed as when it is raised.

  As described above, in the present invention, when the coil is not energized, an oil passage is formed by the first and second ports and the first and second orifices to increase the supply amount to the cylinder and the return amount to the oil tank, The seat is raised and lowered at a normal speed suitable for healthy people, and when the coil is energized, a swelling formed at the tip of the plunger that is attracted to the stator against the spring force of the spring. The exit portion closes the first or second port according to the flow direction of the oil, and is sent out from the oil passage on the inlet side or the outlet side only through the first orifice or the second orifice. The ascending / lowering speed of the machine is low, making it low speed suitable for the elderly, handicapped or children, etc., and it does not give fear, and the structure is very simple. Reduction and low cost It can be achieved.

  Further, the diameter of the first orifice is formed larger than the diameter of the second orifice, and the hydraulic pressure due to the weight of the patient at the time of lowering is lower than the hydraulic pressure of the motor pump at the time of lowering at a speed approximately the same as that at the time of rising. It has the effect that it can be made.

  In the present invention, one large-diameter port and one small-diameter orifice are formed on the inflow side and the outflow side of the oil, respectively, and when the coil is not energized, the oil flows through all the ports and orifices. When energized, the port in the direction of oil flow was closed with a bulging portion formed at the tip of the plunger, so that the oil flowed out only through the closed port side orifice.

Hereinafter, an embodiment of a flow regulating valve according to the present invention will be described with reference to FIGS.
FIGS. 1 to 3 show a flow rate adjustment valve in a state in which the coil is not energized. 1 is when a small amount of oil is supplied to the hydraulic cylinder to gently raise and lower the seat of a beauty chair, etc. A ring-shaped coil to be energized, 2 is a stator magnetized by the coil 1, 3 is a case covering the outer periphery of the coil 1, and is fixed to the case 3 by screws 3 a.

  Reference numeral 4 denotes a valve body, which is fixed to a flange portion 2a formed integrally with the lower portion of the stator 2 by means of a screw (not shown) via an O-ring 2b. A valve rod chamber 4a having a small inner diameter is formed in the central portion of the valve body, and oil passages 4b and 4c are formed across the valve rod chamber 4a. The oil passages 4b and 4c, the valve rod chamber 4a, Are communicated by a first port 4d1 and a second port 4d2 having the same large diameter, a first orifice 4e1 having a small diameter, and a second orifice 4e2 having a smaller diameter than the first orifice 4e1. . The oil passage 4b is connected to the cylinder D side in the hydraulic circuit of FIG. 7 to be described later, and the oil passage 4c is connected to the connection side of the raising electromagnetic valve E and the lowering electromagnetic valve F of the hydraulic circuit, Flows to the oil tank side.

  Reference numeral 5 denotes a plunger accommodated in a large-diameter plunger accommodating chamber 2c of the stator 2 through a gap that can move up and down, and a spring chamber 5a for accommodating the lower portion of the spring 6 is formed above. Yes. The lower end of the plunger 5 is formed with a valve stem 5b that faces the valve stem chamber 4a of the valve body. The lower end of the valve stem 5b has a position where the plunger 5 is raised by the coil 1. 1. A bulging portion 5c is formed at a position facing the second ports 4d1 and 4d2.

Next, for example, a hydraulic circuit for raising and lowering a seat of a hairdressing and beauty chair using the flow rate adjustment valve A of the present invention will be described with reference to FIG.
B is an oil tank, C is an elevating solenoid valve E (to be described later), and an elevating cylinder D for elevating a seat portion of a hairdressing chair through a flow regulating valve A according to the present invention. A motor pump for supplying high-pressure oil to the cylinder), E is a solenoid valve for raising the cylinder D at a normal speed via the flow regulating valve A of the present invention, and F is a flow regulating valve. A lowering solenoid valve for lowering the cylinder D at a normal speed via A, G is a relief valve for adjusting the hydraulic pressure so that the pressure of oil flowing in the hydraulic circuit becomes a preset pressure, and H is a check A valve I is a regulating valve for manually adjusting the flow rate.

Next, the example in the case of raising / lowering the seat part in a barber / beauty chair is demonstrated.
First, the operation of moving the cylinder D up and down without energizing the coil 1 shown in FIGS.
FIG. 1 shows a state where the motor pump C is not operating, that is, a state where no oil is supplied to the cylinder D. In this state, since the oil pressures of the oil passages 4b and 4c are equal, the bulging portion 5c of the valve rod 5b is located at the center of the valve rod chamber 4a.

  Next, the operation of raising the seat of the hairdressing and beauty chair in FIG. 1 will be described with reference to FIG. 2. When the raising switch for raising the seat not shown is turned on, the motor pump C is driven, and The ascending solenoid valve E is turned on, and high-pressure oil flows from the oil passage 4c of the flow rate adjustment valve A toward the oil passage 4b via the check valve H.

  Here, as shown in FIG. 2, when high-pressure oil flows from the oil passage 4c toward the oil passage 4b, the valve stem 5b is slightly tilted to the left by the hydraulic pressure, but the bulging portion 5c of the valve stem 5b. Does not block the second port 4d2 on the oil passage 4b side, so oil from the oil passage 4c passes through the first port 4d1 and the first orifice 4e1 through the valve rod chamber 4a, the second port 4d2 and the second orifice 4e2. Then, the oil amount flowing in the oil passage 4b and set in the release valve G flows in the cylinder D. Therefore, the cylinder D raises the seat at a normal speed.

  Next, the operation for lowering the raised seat will be described with reference to FIG. 3. When a lowering switch (not shown) is turned on, the lowering electromagnetic valve F is turned on and the flow rate adjusting valve A from the cylinder D is turned on. Oil flows from the oil passage 4b toward the oil passage 4c. Here, the valve stem 5b is tilted to the right by the oil, as opposed to the above, but the bulging portion 5c does not block the first port 4d1 as described above, so the flow rate set by the regulating valve I is Oil flows from the second port 4d2 and the second orifice 4e2 into the oil passage 4c through the valve rod chamber 4a, the first port 4d1, and the first orifice 4e1 and is returned to the oil tank B. Therefore, the seat part descends at a normal speed.

  In this way, when the seat is raised and lowered in the state where the coil 1 is not energized, the oil passes from the second port 4d2 and the second orifice 4e2 to both the first port 4d1 and the first orifice 4e1. Therefore, the ascending and descending speed can be operated at a normal speed. However, when an elderly person, a disabled person, a child, or the like is seated and moves up and down, in the above-described normal raising / lowering operation, the coil 1 that is a feature of the present invention is energized so that the raising / lowering speed of the seat portion is moderated I made it.

Hereinafter, an operation for gradually increasing the ascending / descending speed will be described with reference to FIGS.
FIG. 4 shows a state where the coil 1 is energized and the motor pump C is not operating, that is, there is no oil flow, and the oil pressure in the oil passages 4b and 4c is equal. The outlet portion 5c is located between the first port 4d1 and the second port 4d2.

  In this state, when the raising switch for raising the seat is turned on, the motor pump C is driven, and the raising electromagnetic valve E is turned on, and the flow regulating valve A is turned on via the check valve H. Oil flows from the oil passage 4c toward the oil passage 4b. Here, as shown in FIG. 5, when the oil flows from the oil passage 4c toward the oil passage 4b, the bulging portion 5c of the valve rod 5b is inclined to the left by the hydraulic pressure to block the second port 4d2.

  When the second port 4d2 is closed, the oil from the first port 4d1 and the first orifice 4e1 flows from the second orifice 4e2 only through the valve rod chamber 4a to the oil passage 4b and is supplied to the cylinder D. Accordingly, since a small amount of oil is gradually supplied to the cylinder D, the seat portion is gradually raised, and the cylinder D can operate gently and give a sense of fear to the elderly, the disabled or children. Absent.

  Next, when the lowering switch for lowering the raised seat portion is turned on, the lowering solenoid valve F is turned on, and oil flows from the oil passage 4b of the flow rate adjustment valve A to the oil passage 4c from the cylinder D. Flowing. Here, as shown in FIG. 6, when the oil flows from the oil passage 4b toward the oil passage 4c, the bulging portion 5c of the valve rod 5b is inclined to the right by the hydraulic pressure to block the first port 4d1. It will be. When the first port 4d1 is closed, the oil from the second port 4d2 and the second orifice 4e2 flows through the valve rod chamber 4a only from the first orifice 4e1 to the oil passage 4c and passes through the descending solenoid valve F. Is returned to the oil tank B.

  Accordingly, since a small amount of oil is gradually discharged from the cylinder D, the seat portion slowly descends, and it can operate gently and give a sense of fear to the elderly, handicapped or children. There is nothing. When the seat is lowered, the diameter of the first orifice 4e1 is larger than the diameter of the second orifice 4e2, so that the seat rises even if the oil pressure due to the weight of the seated person is smaller than the oil pressure of the motor pump C at the time of ascent. It will descend at approximately the same speed as the hour.

  In the above description of the operation, the case where the seat portion of the barber / beauty chair is raised / lowered has been described. Can do.

It is sectional drawing of the state which is not supplying with electricity to the coil of the flow regulating valve of this invention, and the motor pump is not driving. It is sectional drawing of the state which driven the motor pump same as the above and supplied oil to the cylinder. It is sectional drawing of the state which discharged | emitted the oil of the cylinder in FIG. It is sectional drawing of the state which energized a coil and the motor pump is not driving. It is sectional drawing of the state which driven the motor pump of FIG. 4 and supplied the oil to the cylinder. It is sectional drawing of the state which discharged | emitted the oil of the cylinder in FIG. It is the hydraulic circuit which connected the flow regulating valve of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coil 2 Stator 4 Valve body 4a Valve rod chamber 4b, 4c Oil passage 4d1 1st port 4d2 2nd port 4e1 1st orifice 4e2 2nd orifice 5 Plunger 5b Valve rod 5c Expansion part 6 Spring

Claims (3)

  A large-diameter port first, second and small-diameter first and second orifices are formed in the oil inflow and outflow oil passages, and when the coil is not energized, the first, second port and the first, second When the oil path is formed by two orifices and the coil is energized, the bulging portion formed at the tip of the plunger that is attracted to the stator against the spring force of the spring is caused by the flow of the oil in the first or second direction. A flow rate adjusting valve characterized in that two ports are closed and the oil is sent from an inflow side or an outflow side oil passage only through the first orifice or the second orifice. Coils,
A plunger that is attracted to the stator against the spring force of the spring when the coil is energized;
A valve stem extending from the lower surface of the plunger and having a bulge formed at the lower end;
A valve body in which the valve stem is inserted and a valve stem chamber having a size that allows the bulging portion to be displaced in the horizontal direction;
A pair of oil passages for inflow and outflow of oil formed at a position sandwiching the valve stem of the valve body;
A large-diameter first and second ports and small-diameter first and second orifices formed at the boundary between each oil passage and the valve stem chamber;
When the coil is not energized, the bulging portion of the valve stem is located away from the first and second ports, and the first and second ports and the first and second orifices are used as oil flow paths. When the hydraulic cylinder is raised, the bulging portion of the valve stem closes the second port in the oil flow direction and the oil is supplied to the hydraulic cylinder only from the second orifice. In the case of lowering, a flow rate adjusting valve characterized in that the first port in the oil flowing direction is closed and the oil is returned to the oil tank side only from the first orifice.   The diameter of the first orifice is formed to be larger than the diameter of the second orifice, and the hydraulic pressure due to the weight of the occupant at the time of lowering is lower than the hydraulic pressure at the time of driving the motor pump at the time of lowering at approximately the same speed as when rising. The flow rate regulating valve according to claim 1 or 2, characterized in that:

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