JP2023069611A - Valve seat, and electromagnetic pump with valve seat - Google Patents

Abstract

To suppress excessive deformation of a valve element and properly secure the flow rate of a fluid that flows when the valve element is opened.SOLUTION: A seat 44, 46, on which a reed valve 42 disposed between a pump chamber 32c and at least one of a fluid suction port 34b and a discharge port 34a of an electromagnetic pump 1 can seat, includes a base part 56 that has a counter-face surface 56a facing the reed valve 42 on the downstream side of the reed valve 42 in a direction in which a fluid flows, and an outflow part 60 that is formed in a groove shape in the counter-face surface 56a to allow the fluid flowing in toward the reed valve 42 to flow out to the pump chamber 32c or the discharge port 34a. The outflow part 60 has a plurality of through holes 62, and an extension portion 64 that extends between the plurality of through holes 62 and have a height in a direction from an opposite surface 56b of the base part 56 toward the counter-face surface 56a, which is lower than that of the counter-face surface 56a.SELECTED DRAWING: Figure 3

Description

The present invention relates to a valve seat and an electromagnetic pump with a valve seat.

Conventionally, an electromagnetic pump that sucks and discharges fluid by changing the volume of a pump chamber by reciprocating a piston includes a valve body that opens a flow path of the fluid and a valve seat on which the valve body can be seated. configuration is known. For example, Patent Literature 1 below describes an electromagnetic pump that includes a reed valve as a valve body that opens a flow path of a fluid, and a seat as a valve seat arranged facing the reed valve. .

JP 2010-229955 A

Since the seat described in Patent Document 1 is cylindrical and has an opening in the center, the central portion of the reed valve is greatly deformed toward the seat when the valve is opened, resulting in concentration of stress on the reed valve. There is a possibility of damage etc. On the other hand, if the opening of the seat is made small in order to suppress excessive deformation of the reed valve, there is a problem that it becomes difficult to appropriately secure the flow rate of the fluid that flows when the reed valve opens.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a valve seat and an electromagnetic pump equipped with the valve seat that can suppress excessive deformation of the valve body and appropriately secure the flow rate of the fluid that flows when the valve body is opened. aim.

A valve seat according to a first aspect of the present invention is a valve seat on which a valve body arranged between a pump chamber of an electromagnetic pump and at least one of a fluid suction port and a fluid discharge port can be seated. a main body portion having a facing surface facing the valve body downstream of the valve body in a direction; a plurality of through holes, the outflow portion extending between the plurality of through holes, and the outflow portion extending from a surface opposite to the facing surface of the main body portion to the facing surface. an extension having a height in the facing direction that is lower than the facing surface.

In the valve seat according to the second aspect of the present invention, the outflow portion further has recesses formed around the plurality of through holes so that the extension portion protrudes toward the facing surface.

In the valve seat according to the third aspect of the present invention, the plurality of through holes are formed at symmetrical positions with respect to the extension portion.

An electromagnetic pump according to a fourth aspect of the present invention is an electromagnetic pump that sucks and discharges fluid by changing the volume of a pump chamber, comprising: a movable iron core that can move in one direction by electromagnetic force; a fixed core arranged to face a movable core; a movable body extending along the one direction from an end of the movable core on the one-direction side and moving together with the movable core; an elastic body disposed facing one direction end and imparting an elastic force to move the movable iron core together with the moving body in a direction opposite to the one direction; A valve body disposed between at least one of the outlets and a valve seat according to any one of the first to third aspects.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide a valve seat and an electromagnetic pump equipped with the valve seat that can suppress excessive deformation of the valve body and appropriately secure the flow rate of the fluid that flows when the valve body is opened. can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a sectional side view which shows schematic structure of the electromagnetic pump provided with the valve structure which concerns on embodiment of this invention. FIG. 2 is a plan view of the reed valve shown in FIG. 1; 2 is a perspective view of the seat shown in FIG. 1; FIG. 4 is a cross-sectional view of the sheet of FIG. 3 taken along line IV-IV; FIG.

Hereinafter, embodiments of the present invention (hereinafter referred to as "present embodiments") will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same reference numerals are given to the same elements or elements having the same functions in each drawing as much as possible, and overlapping descriptions are omitted.

<Overall Configuration of Electromagnetic Pump>
FIG. 1 is a side sectional view showing a schematic configuration of an electromagnetic pump having a valve structure according to this embodiment. As shown in FIG. 1, the electromagnetic pump 1 is a device that sequentially sucks and discharges fluid (liquid or gas) using electromagnetic force and elastic force. The electromagnetic pump 1 includes an electromagnetic coil 10, a plunger 16, a stopper 18, a movable body 20, a spring member 30, a case 32, a pump body 34, and a valve structure 40.

The electromagnetic coil 10 is formed of an annular coil bobbin 12 and a copper wire wound around the coil bobbin 12 . The plunger 16 and the stopper 18 are magnetized by the magnetic field generated when the electromagnetic coil 10 is excited (ON), and an electromagnetic force acts to attract the plunger 16 to the stopper 18 . FIG. 1 shows the electromagnetic coil 10 in a de-excited (OFF) state.

The plunger 16 is a movable iron core that can move in one direction X toward the stopper 18 by electromagnetic force. The plunger 16 is made of a magnetic material and has a substantially cylindrical shape. In addition, the plunger 16 can move in the other direction Y opposite to the one direction X together with the moving body 20 by the elastic force of the spring member 30 . Hereinafter, the movement of the plunger 16 in one direction X will be referred to as "forward motion", and the movement of the plunger 16 in the other direction Y will be referred to as "backward motion".

The stopper 18 is a fixed iron core arranged to face the plunger 16 in the one direction X. As shown in FIG. The stopper 18 is made of a magnetic material and has a substantially cylindrical shape. The stopper 18 is arranged coaxially with the plunger 16 . The stopper 18 has an annular base portion 18a and a cylindrical receiving portion 18b erected from the base portion 18a.

The moving body 20 extends along the one direction X from an end 16a of the plunger 16 on the one direction X side, and moves together with the plunger 16 as the plunger 16 moves forward or backward. The mobile body 20 has a rod 22 and a piston 24 .

The rod 22 is formed to stand from the end portion 16 a of the plunger 16 and extends along the one direction X coaxially with the plunger 16 . Further, the rod 22 is inserted through the linear guide 21 at the axial center portion of the stopper 18 and arranged coaxially with the stopper 18 .

The piston 24 is in contact with the end of the rod 22 on the one direction X side. The piston 24 is slidably inserted into the pump body 34 and arranged coaxially with the rod 22 . A guide portion 26 extending along the outer periphery of the spring member 30 is formed at the end portion of the piston 24 on the one direction X side.

The spring member 30 is arranged to face the end surface 24a of the piston 24 and biases the end surface 24a in the other Y direction. Thereby, the spring member 30 applies elastic force to the plunger 16 via the moving body 20 .

The case 32 has a substantially cylindrical shape with a bottom, and houses the electromagnetic coil 10, the plunger 16, the stopper 18, a portion of the moving body 20, and the like. A pump body 34 is engaged with the case 32 . The pump body 34 has a substantially cylindrical shape with a bottom, and accommodates the piston 24, the spring member 30, and the like. The pump main body 34 is provided with a discharge port 34a, which is a discharge port for discharging fluid to the outside, and a suction port 34b, which is a suction port for sucking fluid from the outside. The internal space of the pump main body 34 constitutes a pump chamber 34c in which fluid is accumulated.

The valve structure 40 is arranged to face the end portion of the spring member 30 on the one direction X side. Valve structure 40 includes reed valve 42 and seats 44 , 46 .

The reed valve 42 is arranged between the pump chamber 34c and the suction port 34b and the discharge port 34a. The reed valve 42 is a valve body that opens a channel between the pump chamber 34c and the suction port 34b and a channel between the pump chamber 34c and the discharge port 34a. A portion of the reed valve 42 between the pump chamber 34c and the suction port 34b functions as a suction valve 42a, and a portion between the pump chamber 34c and the discharge port 34a functions as a discharge valve 42b.

Seats 44 and 46 are valve seats on which reed valve 42 can be seated. The seat 44 is a suction valve seat arranged downstream of the reed valve 42 in the direction in which the fluid flows from the suction port 34b toward the pump chamber 34c, that is, between the reed valve 42 and the pump chamber 34c. The seat 46 is a discharge valve seat arranged downstream of the reed valve 42 in the direction in which the fluid flows from the pump chamber 34c toward the discharge port 34a, that is, between the reed valve 42 and the discharge port 34a. The seat 44 and the seat 46 have the same structure, and are positioned opposite each other by 180 degrees so as to sandwich the reed valve 42 therebetween.

<Configuration of reed valve>
Next, referring to FIG. 2, the configuration of the reed valve will be described. 2 is a plan view of the reed valve 42 shown in FIG. 1. FIG. FIG. 2 shows the reed valve 42 viewed from the seat 44 side, and the partial configuration of the seat 46 on the back side of the reed valve 42 is shown by broken lines.

As shown in FIG. 2, the reed valve 42 has a disk portion 48 and through grooves 50a, 50b, 50c, and 50d formed in the disk portion 48. As shown in FIG. The disk portion 48 is sandwiched between the sheets 44 and 46 and faces the sheets 44 and 46 . In FIG. 2, an imaginary line that bisects the disc portion 48 into semi-circular regions is indicated as a centerline A. As shown in FIG. The through grooves 50a, 50b, 50c, and 50d are formed in an arc shape by connecting arcs with different curvatures. With respect to the center line A, the through grooves 50a and 50b are positioned on one side, and the through grooves 50c and 50d are positioned on the other side. The through grooves 50a, 50b and the through grooves 50c, 50d are formed at symmetrical positions with the center line A as an axis.

The through grooves 50a and 50b are formed along the inner periphery of the suction port 34b facing the disc portion 48 with the seat 46 interposed therebetween. The through grooves 50a and 50b are suction grooves for opening a flow path between the pump chamber 34c and the suction port 34b to suck fluid into the pump chamber 34c. On the other hand, the through grooves 50c and 50d are formed along the inner periphery of the discharge port 34a facing the disk portion 48 with the sheet 46 interposed therebetween. The through grooves 50c and 50d are discharge grooves for opening a flow path between the pump chamber 34c and the discharge port 34a to discharge fluid to the discharge port 34a.

The reed valve 42 has a pin hole 54 for inserting a pin for positioning the reed valve 42 and the seats 44 and 46 . Two pin holes 54 are formed, for example, at positions through which the center line A passes, while being spaced apart from each other.

<Seat configuration>
Next, referring to FIG. 3, the configuration of the seats 44, 46 will be described. FIG. 3 is a perspective view of the seats 44, 46 shown in FIG. As shown in FIG. 3 , the sheets 44 , 46 have a disk-shaped base 56 and an inflow portion 58 and an outflow portion 60 formed in the base portion 56 . The base portion 56 is a body portion of the seats 44 and 46, and includes a facing surface 56a facing the reed valve 42 on the downstream side of the reed valve 42 in the direction of fluid flow, and an opposite surface 56b on the opposite side of the facing surface 56a. ,have. In FIG. 3, an imaginary line that bisects the base 56 into semi-circular regions is shown as a centerline B. As shown in FIG. With respect to the center line B, the inflow portion 58 is located on one side and the outflow portion 60 is located on the other side.

The inflow portion 58 is a through hole penetrating from the opposing surface 56 a to the opposite surface 56 b of the base portion 56 and allows fluid to flow from the suction port 34 b or the pump chamber 34 c toward the reed valve 42 . On the other hand, the outflow portion 60 is a groove-shaped bottomed hole formed in the facing surface 56a of the base portion 56, and allows the fluid flowing toward the reed valve 42 to flow out to the pump chamber 34c or the discharge port 34a. The outflow portion 60 includes a plurality of (four in this embodiment) through holes 62 (62a, 62b, 62c, 62d), an extension portion 64 extending between the plurality of through holes 62, and a plurality of through holes 62. and a recess 66 formed around the hole 62 .

A plurality of through holes 62 are formed along the inner circumference of the outflow portion 60 so as to be spaced apart from each other at predetermined intervals. The plurality of through-holes 62 allow fluid to flow out when the opposing reed valves 42 are opened. The plurality of through holes 62 are symmetrically positioned with respect to the extension 64 . For example, the plurality of through holes 62 are positioned so as to have line symmetry about a straight line passing through the center of the extension portion 64 or point symmetry about the center of the extension portion 64 . The diameters of the through holes 62c, 62d are larger than the diameters of the through holes 62a, 62b.

The extending portion 64 is formed substantially in the center of the outflow portion 60 . In the direction from the opposite surface 56b to the opposing surface 56a, the height of the extension portion 64 is lower than the height of the opposing surface 56a. In other words, the extending portion 64 is located downstream of the facing surface 56a in the direction in which the fluid flows. The extending portion 64 protrudes from the bottom surface of the recess 66 toward the opposing surface 56a. The extending portion 64 extends from a center portion surrounded by the plurality of through holes 62 as a starting point so as to connect between the plurality of through holes 62 adjacent to each other, and is formed in a substantially cross shape. The extending portion 64 is formed so as to connect approximately semicircular portions on the center side of the outflow portion 60 among the outer peripheries of the plurality of through holes 62 . Extension 64 is connected to base 56 via recess 66 .

The recesses 66 are formed around the plurality of through holes 62 so that the extensions 64 protrude toward the facing surface 56a. The recessed portion 66 is annularly formed around a substantially semicircular portion on the inner peripheral side of the outflow portion 60 among the outer peripheries of the plurality of through holes 62 . A recess 66 is interposed between the base 56 and the extension 64 . The upper surface of the extension portion 64 (the surface on the side of the opposing surface 56a) protrudes toward the opposing surface 56a compared to the bottom surface of the recess 66, and the bottom surface of the recess 66 and the upper surface of the extension portion 64 form a step. there is

The seats 44 and 46 have pin holes 68 for inserting pins for positioning the reed valve 42 and the seats 44 and 46 . Two pin holes 68 are formed at positions corresponding to the pin holes 54 through which the center line B passes, for example.

<Operation of Valve Structure 40 and Electromagnetic Pump 1>
Next, operation of the valve structure 40 and the electromagnetic pump 1 will be described with reference to FIGS. 1 to 3. FIG. First, when the electromagnetic coil 10 is de-energized (OFF), the piston 24 urged by the elastic force of the spring member 30 moves in the other Y direction. The rod 22 is pressed in the other direction Y by the piston 24 , and the plunger 16 moves back together with the rod 22 . As a result, the volume of the pump chamber 34c increases, and the fluid corresponding to this increase in volume is sucked through the valve structure 40 from the suction port 34b.

At this time, in the valve structure 40, the central portion of the reed valve 42 on the intake port 34b side (one side with respect to the center line A in FIG. 2) is deformed toward the seat 44 side. As a result, the flow path between the pump chamber 34c and the suction port 34b is opened, and the fluid that has flowed into the through grooves 50a and 50b of the reed valve 42 passes through the recess 66 and the plurality of through holes 62 in the seat 44 and into the pump chamber. 34c. When the end portion 16b of the plunger 16 is in contact with the inner surface 14b of the case 14, the volume of the pump chamber 34c is maximized.

Next, when the electromagnetic coil 10 is energized (ON), the plunger 16 is attracted toward the stopper 18 by the electromagnetic force. As a result, the plunger 16 moves forward against the elastic force of the spring member 30 . The rod 22 moves in the one direction X together with the plunger 16, and the piston 24 pressed by the rod 22 moves in the one direction X. As a result, the volume of the pump chamber 34c is reduced, and the fluid corresponding to this volume reduction is discharged through the valve structure 40 to the discharge port 34a.

At this time, in the valve structure 40, the central portion of the reed valve 42 on the discharge port 34a side (the other side with respect to the center line A in FIG. 2) is deformed toward the seat 46 side. As a result, the flow path between the pump chamber 34c and the discharge port 34a is opened, and the fluid that has flowed into the through grooves 50c and 50d of the reed valve 42 passes through the recess 66 and the plurality of through holes 62 in the seat 46 and flows through the discharge port. 34a. When the plunger 16 is in contact with the receiving portion 18b of the stopper 18, the volume of the pump chamber 34c is minimized.

<Effect>
Next, with reference to FIG. 4, the operation and effect of the electromagnetic pump 1 provided with the seats 44, 46 and the seats 44, 46 according to the above embodiment will be described. 4 is a cross-sectional view of the sheet of FIG. 3 along line IV-IV. FIG. 4(a) shows a cross-sectional view when the outflow portion 60 has a concave portion 66 like the sheets 44 and 46 according to the above embodiment. FIG. 4(b) shows a cross-sectional view in which the outflow portion 60 does not have the concave portion 66 as a modification of the above embodiment. 4, the closed reed valve 42 is indicated by a solid line, and the open reed valve 42 is indicated by a broken line.

As shown in FIGS. 4(a) and 4(b), when the reed valve 42 is deformed and opened as indicated by the dashed line, the extending portion 64 of the outflow portion 60 abuts against the deformed reed valve 42. It functions as a stopper to prevent excessive deformation of the reed valve 42 . Further, by causing the fluid to flow out from the plurality of through-holes 62 in the outflow portion 60, for example, a flow path equivalent to or greater than that obtained by forming one through-hole at a position corresponding to the extension portion 64 of the outflow portion 60 can be secured. be able to.

Furthermore, when the outflow portion 60 has a recess 66 as shown in FIG. 4A, the fluid that has flowed into the reed valve 42 flows into the recess 66, and the recess 66 as well as the plurality of through holes 62 are flow paths. can function as As a result, compared to the case where the outflow part 60 does not have the concave part 66 as shown in FIG. 4(b), the channel can be made larger. As a result, the internal pressure of the piston in the electromagnetic pump 1 is, for example, 65 kPa in the case shown in FIG. 4B, whereas it can be reduced to 50 kPa in the case shown in FIG. can be made smaller. In addition, since the extending portion 64 protrudes toward the opposing surface 56a, it is possible to more appropriately function as a stopper for the deformed reed valve 42 . Further, since the extension portion 64 is formed in a substantially cross shape, it can abut against the reed valve 42 with a uniform force.

As described above, the seats 44 and 46 according to the above embodiment are valve seats on which the reed valve 42 arranged between the pump chamber 32c of the electromagnetic pump 1 and at least one of the fluid suction port 34b and the fluid discharge port 34a can be seated. A base portion 56 as a body portion having a facing surface 56a facing the reed valve 42 on the downstream side of the reed valve 42 in the direction in which the fluid flows, an outflow portion 60 for causing the inflowing fluid to flow out to the pump chamber 32c or the discharge port 34a, the outflow portion 60 extending between the plurality of through holes 62 and the plurality of through holes 62 and and an extending portion 64 whose height in the direction toward the opposing surface 56a is lower than that of the opposing surface 56a.
According to this configuration, when the reed valve 42 is deformed during intake or discharge of fluid, the extending portions 64 of the seats 44 and 46 function as stoppers for the deformed reed valve 42 . As a result, excessive deformation of the reed valve 42 can be suppressed. As a result, the stress applied to the reed valve 42 can be reduced, and breakage of the reed valve 42 can be suppressed. Further, by causing the fluid to flow out from the plurality of through holes 62 in the outflow portion 60, it is possible to appropriately ensure the flow rate of the fluid that flows when the reed valve 42 is opened. As described above, it is possible to provide the seats 44 and 46 capable of suppressing excessive deformation of the reed valve 42 and appropriately securing the flow rate of the fluid flowing when the reed valve 42 is opened.

Further, in the sheets 44 and 46 according to the above embodiment, the outflow portion 60 further has recesses 66 formed around the plurality of through holes 62 so that the extension portions 64 protrude toward the opposing surface 56a.
According to this configuration, since the extension portion 64 protrudes toward the opposing surface 56a, it is possible to more appropriately function as a stopper for the deformed reed valve 42 . In addition, since the recesses 66 are formed around the plurality of through holes 62, not only the plurality of through holes 62 but also the recesses 66 can function as flow paths. Higher fluid flow rates are possible.

Also, in the sheets 44 and 46 according to the above embodiment, the plurality of through holes 62 are formed at symmetrical positions with respect to the extension portion 64 .
According to this configuration, the plurality of through-holes 62 positioned symmetrically with respect to the extension portion 64 can be used as flow paths to allow the fluid to flow more appropriately.

Further, the electromagnetic pump 1 according to the above-described embodiment is an electromagnetic pump that sucks and discharges fluid by changing the volume of the pump chamber 34c. , a stopper 18 which is a fixed iron core disposed facing the plunger 16 in one direction X; 20, and a spring member 30, which is an elastic body arranged to face the end of the moving body 20 on the one-direction X side and imparts an elastic force capable of moving the plunger 16 together with the moving body 20 in the direction opposite to the one-direction X. , a reed valve 42 disposed between the pump chamber 32c and at least one of the suction port 34b and the discharge port 34a, and the seats 44 and 46 described in the above embodiment.
This configuration provides the electromagnetic pump 1 including the seats 44 and 46 that can suppress excessive deformation of the reed valve 42 and appropriately secure the flow rate of the fluid that flows when the reed valve 42 is opened. be able to.

<Modification>
The invention is not limited to the embodiments described above. In other words, the above-described embodiments are also included in the scope of the present invention as long as they have the features of the present invention, as long as they have the features of the present invention. In addition, each element provided in the above-described embodiment and modifications described later can be combined as long as it is technically possible, and the combination thereof is also included in the scope of the present invention as long as it includes the features of the present invention. .

For example, in the above embodiment, an example in which one reed valve 42 opens and closes both the suction port 34b and the discharge port 34a has been described. A valve may be provided. That is, the reed valve 42 may be arranged between the pump chamber 34c and either one of the suction port 34b and the discharge port 34a instead of both the pump chamber 34c and the suction port 34b and the discharge port 34a. The seats 44 and 46 may be provided at positions where the reed valves provided in the suction port 34b and the discharge port 34a can be seated instead of being positioned so as to sandwich the reed valve 42 therebetween.

In the above embodiment, the outflow portion 60 of the sheets 44 and 46 has the concave portion 66 as shown in FIG. 4(a). 66 may not be included. Further, the extending portion 64 of the outflow portion 60 does not have to protrude toward the facing surface 56a side, and may be positioned away from the center of the outflow portion 60 . Also, the plurality of through holes 62 are not limited to four, and may be any number of two or more, may not be positioned symmetrically with respect to the extension portion 64, and may all have the same diameter. good. Further, each component such as the rod 22 and the piston 24 of the moving body 20 may be formed separately or integrally.

1: electromagnetic pump, 42: reed valve (valve element), 44, 44: seat (valve seat), 60: outflow part, 62a, 62b, 62c, 62d (62): through hole, 64: extension part, 66 : Concave

Claims (4)

A valve seat on which a valve body arranged between a pump chamber of an electromagnetic pump and at least one of a fluid suction port and a fluid discharge port can be seated,
a body portion having a facing surface facing the valve body downstream of the valve body in the direction of fluid flow;
an outflow portion formed in the opposing surface in a groove shape for causing the fluid flowing toward the valve body to flow out to the pump chamber or the discharge port;
with
The outflow portion extends between a plurality of through-holes and the plurality of through-holes, and has a height in a direction from a surface of the body portion opposite to the facing surface toward the facing surface. a lower extension than
valve seat. The outflow part further has recesses formed around the plurality of through-holes so that the extension parts protrude toward the facing surface,
A valve seat according to claim 1 . The plurality of through holes are formed at symmetrical positions with respect to the extension.
3. A valve seat according to claim 1 or 2. An electromagnetic pump that sucks and discharges fluid by changing the volume of a pump chamber,
a movable iron core that can move in one direction by electromagnetic force;
a fixed core arranged to face the movable core in the one direction;
a moving body extending along the one direction from an end of the movable core on the one-direction side and moving together with the movable core;
an elastic body arranged to face an end of the moving body on the one-direction side and imparting an elastic force to move the movable core together with the moving body in a direction opposite to the one direction;
a valve body disposed between the pump chamber and at least one of a fluid suction port and a fluid discharge port;
a valve seat according to any one of claims 1 to 3;
electromagnetic pump.

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