JP2004190555A - Valve device for electromagnetic pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce valve striking noise occurring upon a suction valve being seated on a valve seat. <P>SOLUTION: A valve device arranged inside a valve housing chamber 21c of a valve case 21b comprises a valve element 21d of the suction valve seated on the valve seat 21a by a spring 21e. Of holes 21f opening on the side face of the valve case 21b, at least the holes on the edge of the valve element 21d side is formed separated from a spring receiving part 21i of the valve element 21d. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve device, and particularly to a valve device for an electromagnetic pump.
[0002]
[Prior art]
The electromagnetic pump includes a piston that is reciprocated by an electromagnetic force, and a suction valve and a discharge valve that cooperate with the piston. The pressure in the pump chamber changes due to a change in the volume of the pump chamber due to the reciprocation of the piston. In addition, a pump action is performed in which the suction valve is opened at the time of negative pressure to suck in the fluid, and the discharge valve is opened at the time of pressurization (positive pressure) to discharge the fluid.
[0003]
For example, as shown in Patent Document 1, a suction valve 21 and a discharge valve 23 form a suction / discharge valve unit 80 integrated with valve seats 23 a and 21 a and a lid 24, and a hole formed in the pump body 17. It is inserted and attached to 81. When the suction / discharge valve unit 80 is enlarged as shown in FIG. 4, the suction valve 21 has a suction valve seat 21a and is engaged with a discharge valve case 23b described below; A valve 21d disposed in a valve housing 21c formed in the case 21b, and a spring 21e for pressing the valve 21d against the valve seat 21b, and a hole 21f is formed in the suction valve case 21b. Have been.
[0004]
The discharge valve 23 has a discharge valve seat 23a, and a discharge valve case 23b to which a lid 24 is fitted, a valve element 23d disposed in a valve element storage chamber 23c formed in the suction valve case 23b, and a valve element 23d. The discharge valve case 23b has a hole 23f formed of a spring 23e for pressing the valve 23d against the valve seat 23b.
[0005]
[Patent Document 1] JP-A-8-189461
[Problems to be solved by the invention]
As described above, the pump chamber 30 including the piston and the cylinder (not shown) is formed in the vicinity of the suction valve 21, and the volume of the pump chamber 30 is changed by the reciprocating motion of the piston. When the valve 21d of the valve 21 is opened and fluid is sucked, when the volume is reduced, the fluid is pressurized and flows at a high speed from the pump chamber 30 to the valve housing 21c as shown by the arrow.
[0007]
At this time, a hole 21f formed in the suction valve case 21b is opened at a position in the centrifugal direction of the valve body 21d of the suction valve, and the flowing fluid hits the side surface of the valve body 21d and shifts the valve body. Accordingly, when the valve body 21d is seated on the valve seat 21a, a delay time difference occurs from the top dead center position of the piston, and after the valve body storage chamber 21c reaches a high pressure, the valve body 21d is seated on the valve seat 21a. Will be. That is, the closing acceleration force increased and a tapping sound was generated.
[0008]
In view of the above, an object of the present invention is to prevent occurrence of a tapping sound which occurs when a valve body of a suction valve is seated on a valve seat.
[0009]
[Means for Solving the Problems]
A valve device for an electromagnetic pump according to the present invention is a valve device comprising a valve body disposed in a valve body storage chamber of a valve case and seated on a valve seat by a spring. It is formed at a position away from the spring receiving portion of the body (claim 1). As a result, the high-pressure, high-speed fluid from the pump chamber flows into the valve housing chamber through the hole when the piston descends and is pressurized. Therefore, the delay time difference from the top dead center position of the piston to the seating of the valve body on the valve seat can be reduced, and the tapping sound when the valve body is seated on the valve seat can be prevented.
[0010]
In the usage example, if the dimension from the valve element side end of the hole to the spring receiving portion of the valve element is about the thickness of the valve element (claim 2), the best result can be obtained in reducing the tapping noise.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
First, the electromagnetic pump 1 using the valve device according to the present invention will be described with reference to FIGS. 1 and 2, and then the valve device 28 will be described. The electromagnetic pump 1 includes an electromagnetic coil 2 through which an intermittent current (pulse current) flows, and the electromagnetic coil 2 is wound around a bobbin 3 made of resin. A guide pipe 5 made of a metallic nonmagnetic material is provided in the center through hole of the bobbin 3 in the longitudinal direction. The guide pipe 5 has an upper end in contact with the magnetic rod 4 and a lower end in contact with a pump body 17 described below. Reference numeral 6 denotes a vertical hole penetrating the magnetic rod 4, which communicates with a discharge port (not shown).
[0012]
The electromagnetic plunger 9 is made of a magnetic material and is supported by an upper spring 10a and a lower spring 10b in an electromagnetic plunger working chamber 11 composed of the guide pipe 5. The upper spring chamber 11a and the lower spring chamber 11b communicate with each other through a vertical hole 12. ing. At the lower end of the electromagnetic plunger 9, a piston 14 described below is fixed.
[0013]
The piston 14 is fixed to the electromagnetic plunger 9 as described above, inserted into the cylinder 16, and reciprocates with the reciprocation of the electromagnetic plunger 9. The cylinder 16 is supported by a pump body 17 via an O-ring 18. The cylinder 16 supports the lower end of the lower end spring 10b.
[0014]
In the pump chamber 20, the front end of the piston 14 forms one surface, and the reciprocating motion of the piston causes a pressure change in the chamber 20. When the pressure becomes negative, the suction valve 21 described below is opened and the fluid flows from the suction hole 22. When the pressure becomes positive, the discharge valve 23 is opened and the pressure is discharged into the plunger working chamber 11 through a pressure adjusting device 30 described below.
[0015]
FIG. 3 is an overall enlarged view of the valve device 28. The valve device 28 is configured by connecting the suction valve 21 and the discharge valve 23. First, from the suction valve 21, the valve case 21b has a through hole 21g at the center. And a large-diameter valve storage chamber 21c connected to the left side of the valve seat 21a, and a claw 21h that engages with the valve case 23b of the discharge valve 23 is provided at the leftmost end.
[0016]
A valve element 21d is disposed in the valve storage chamber 21c of the valve case 21b of the suction valve, pressed by a spring 21e, and seated on the valve seat 21a. Further, a plurality of holes 21f are formed at appropriate places on the side surface of the valve case 21b, and the valve storage chamber 21c communicates with the pump chamber 20 via the holes 21f. The position of the hole 21f formed in the suction valve 21 is such that the valve body side end of the hole 21f is up to the spring receiving portion 21i of the valve body 21d and the dimension L is substantially equal to the thickness of the valve body 21d. I have. 21j is an O-ring groove in which the O-ring 25 is stored.
[0017]
The discharge valve 23 has a valve case 23b formed with a valve seat 23a having a through hole 23g at the center and a large-diameter valve storage chamber 23c connected to the left side thereof. 23h are formed. An annular groove 23j and a groove 23k for accommodating the O-ring 26 are formed on the right side of the outer periphery.
[0018]
A valve case 23b of the discharge valve 23 has a valve body 23d disposed in the valve storage chamber 23c, is pressed by a spring 23e, and is seated on the valve seat 23a. Further, a plurality of holes 23f are formed at appropriate positions of the valve case 23b, and the valve storage chamber 23c communicates with the plunger operating chamber 11 through the holes 23f. The lid 24 has an annular groove 24a that engages with the claw 23h of the discharge valve 23 and a groove 24b in which the O-ring 27 is housed.
[0019]
The pressure adjusting device 30 is provided in a flow path 47 extending from the discharge valve 23 to the plunger working chamber 11. The flow path 47 is provided with a valve 38, and the discharge pressure is adjusted by the valve 38 and the throttle hole 39. The flow path area is appropriately narrowed by using the valve, and the pressure is controlled to a predetermined value based on the flow rate of the flowing fluid. Specifically, the valve 38 is pressed by the spring 40 in the direction in which the valve 38 is seated on the valve seat 41. The valve 38 is pressed by a rod 42 attached to a pressure receiving plunger 43 described below in the direction in which the spring 40 extends in the opposite direction, and the valve 38 is held at a position where the pressing forces from the two 40 and 42 are balanced.
[0020]
The pressure receiving plunger 43 is slidably disposed in a bore 44, receives a discharge pressure on the front surface, and is urged by a pressure adjusting spring 45 on a rear surface. 38. By turning the pressure adjusting bolt 46, the setting force of the pressure adjusting spring 45 can be adjusted, and the pressure can be adjusted to a predetermined pressure.
[0021]
Next, when an intermittent current (pulse current) is applied to the electromagnetic coil 2 to the electromagnetic pump 1 as described above, an intermittent magnetic force is generated in the electromagnetic coil 2, and the electromagnetic plunger 9 and the piston 14 reciprocate. When the pressure rises, the volume of the pump chamber 20 increases, the pressure in the pump chamber 20 becomes lower than the pressure in the suction hole 2, the suction valve 21 is opened to suck the fluid, and the pump reaches the top dead center. When the increase in the volume of the chamber stops, the suction of the fluid stops, and when the piston 14 descends, the volume of the pump chamber decreases, and the pressure of the pump chamber 20 is higher than the pressure on the downstream side of the discharge valve 23. Then, the discharge valve 23 is opened to cause the fluid to flow out, and a pump action is performed by repeating such an operation.
[0022]
When the piston 14 is lowered, the fluid flows into the valve storage chamber 21c at a high pressure and at a high speed through the hole 21f. Since the flow of the fluid also flows to the valve body 21d side as shown by the arrow, the high pressure of the fluid is received from the spring receiving portion 21i side of the valve body 21d, and the valve body 21d is pressed. The difference in delay time until the user sits down can be reduced. This prevents the tapping sound of the suction valve from being generated.
[0023]
【The invention's effect】
As described above, according to the present invention, the high-pressure high-speed fluid flowing into the valve storage chamber from the opening of the valve case of the suction valve does not hit the side surface of the valve body of the suction valve, and the high-pressure fluid flows to the valve seat of the valve body. The seating delay (the delay time from the top dead center position of the piston) can be reduced, and the seat can be seated earlier on the valve seat.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an electromagnetic pump using a valve device of the present invention.
FIG. 2 is a cross-sectional view of the same.
FIG. 3 is a cross-sectional view of the valve device.
FIG. 4 is a sectional view of a conventional valve device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 electromagnetic pump 2 electromagnetic coil 9 electromagnetic plunger 14 piston 16 cylinder 21 suction valve 21a valve seat 21b valve case 21c valve body storage chamber 21d valve body 21e spring 21f hole 21g through hole 21h pawl 21i spring receiving portion 21j groove 23 discharge valve 23d valve Body 24 lid

Claims (2)

In a valve device comprising a valve element disposed in a valve element storage chamber of a valve case and seated on a valve seat by a spring,
A valve device for an electromagnetic pump, wherein a hole opening on a side surface of the valve case is formed at a position away from a spring receiving portion of the valve body. 2. The valve device for an electromagnetic pump according to claim 1, wherein the dimension from the valve element side end of the hole to the spring receiving portion of the valve element is about the thickness of the valve element.

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