JP2023065969A - Electromagnetic driving pump - Google Patents

Abstract

To provide an electromagnetic driving pump capable of easily adjusting a discharge flow rate by using a simple configuration and highly accurately maintaining the discharge flow rate.SOLUTION: An electromagnetic driving pump 100 includes: an electromagnetic coil 102; a fixed iron core 106 disposed on the inner side of the electromagnetic coil; a plunger 110 moving on the inner side of the electromagnetic coil; and a cylindrical guide 108 guiding the movement of the plunger on the inner side of the electromagnetic coil. An end surface 126 of the plunger and an end surface 128 of the guide are disposed to oppose to an end surface 130 of the fixed iron core. The electromagnetic driving pump further includes: a metal spacer 132 disposed to abut on the end surface of the fixed iron core and adjusting a stroke of the plunger; and an elastic ring 134 sealing a space between the metal spacer and the end surface of the guide and energizing the metal spacer toward the end surface of the fixed iron core.SELECTED DRAWING: Figure 2

Description

The present invention relates to an electromagnetically driven pump that uses an electromagnetic coil as power.

2. Description of the Related Art Conventionally, an electromagnetic drive pump using an electromagnetic coil for power is known as a pump for transferring fluid. An electromagnetic drive pump transfers fluid by reciprocating a plunger (movable iron core) inside a housing.

Patent Literature 1 describes an electromagnetic pump. This electromagnetic pump has a cylindrical body, a cylindrical coil inserted into the body, a movable iron core sliding inside the coil, and a fixed iron core provided inside the coil facing the movable iron core. , a pump body, and an adjustment mechanism.

A pump body is attached to the body and has an inlet and an outlet. Further, the pump main body is formed with through-holes communicating with the suction port and the discharge port, respectively, and these through-holes are provided with inlet check valves and outlet check valves, respectively.

The adjustment mechanism is attached to the body and presses the movable iron core to regulate the stroke of the movable iron core. have.

Furthermore, in this electromagnetic pump, the suction port and the discharge port of the pump body are arranged on one side of the movable iron core, and the adjustment mechanism is arranged on the opposite side of the suction port and the discharge port. Patent Document 1 states that the suction port and the discharge port are arranged on the same side of the movable iron core, and the stroke of the movable iron core is adjusted by an adjusting mechanism, thereby making it possible to mechanically and easily adjust the discharge amount.

JP 2012-47058 A

However, in the technique of Patent Document 1, it is necessary to adjust the discharge flow rate by an adjustment mechanism over time while measuring the discharge flow rate with high accuracy after the electromagnetic pump is assembled. Moreover, the adjusting mechanism requires an adjusting screw and a nut member to adjust the stroke of the movable iron core, which increases the number of parts.

As another example, it is conceivable to restrict the stroke of the movable core by attaching rubber to the end face of the movable core, that is, the end face facing the fixed core. However, in this case, if the rubber deteriorates over time, the stroke of the movable iron core becomes longer, and the discharge flow rate increases.

Furthermore, in an electromagnetic pump, if air is trapped in the pump chamber and compression and expansion are repeated, an appropriate discharge flow rate cannot be obtained according to the stroke of the armature, and the discharge flow rate will decrease, and the discharge flow rate will be maintained. becomes difficult.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an electromagnetically driven pump that has a simple structure, can easily adjust the discharge flow rate, and can maintain the discharge flow rate with high accuracy.

In order to solve the above problems, a representative configuration of an electromagnetic drive pump according to the present invention is an electromagnetic drive pump having an electromagnetic coil, wherein a fixed iron core disposed inside the electromagnetic coil and the inside of the electromagnetic coil A moving plunger and a cylindrical guide that guides the movement of the plunger inside the electromagnetic coil, wherein the end face of the plunger and the end face of the guide are arranged to face the end face of the fixed iron core. The drive pump is further arranged in contact with the end face of the fixed core, and seals between the metal spacer for adjusting the stroke of the plunger and the end face of the guide, and pushes the metal spacer toward the end face of the fixed core. and a biasing elastic ring.

In the above configuration, the metal spacer for adjusting the stroke of the plunger is placed in contact with the end face of the fixed core, the metal spacer is urged toward the end face of the fixed core by the elastic ring, and the metal spacer and the end face of the guide are aligned. It seals the space.

Therefore, when the electromagnetic coil is excited, the attractive force between the electromagnetic coil and the plunger causes the plunger to move toward the metal spacer arranged in contact with the end face of the fixed core, and the end face of the plunger moves toward the metal spacer. The movement stops when it comes into contact with the That is, the stroke dimension of the plunger can be set by the thickness dimension of the metal spacer. As a result, when assembling the electromagnetically driven pump, the stroke dimension of the plunger can be set with high accuracy to, for example, a specified value simply by selecting and assembling a metal spacer having an appropriate thickness dimension.

Therefore, according to the above configuration, the discharge flow rate can be easily adjusted with a simple structure, and the accuracy of the discharge flow rate can be improved. Further, since the metal spacer is biased toward the end face of the fixed core by the elastic ring, it can be fixed to the end face of the fixed core so that it does not move, and the ease of assembly can be improved.

Furthermore, since the elastic ring seals between the metal spacer and the end face of the guide, it is also possible to seal between the metal spacer, the guide and the bobbin. The bobbin is arranged outside the guide and forms an electromagnetic coil by being wound with a wire. Therefore, it is possible to prevent the fluid from leaking to the bobbin side. In addition, by sealing between the metal spacer, the guide and the bobbin, air remaining around the guide can be isolated from the pump chamber, for example. As a result, it is possible to prevent air from being trapped in the pump chamber and maintain an appropriate discharge flow rate according to the stroke of the plunger with high accuracy.

The metal spacers described above are preferably made of a non-magnetic material.

As a result, when the electromagnetic coil is excited and the end face of the plunger is in contact with the metal spacer, a magnetic field corresponding to the thickness of the metal spacer made of non-magnetic material is generated between the end face of the fixed core and the end face of the plunger. A gap will be created. Therefore, when the current to the electromagnetic coil is turned off with the end face of the plunger in contact with the metal spacer, the magnetic gap makes it easier for the end face of the plunger to separate from the metal spacer. makes it easier to return to the initial position. That is, according to the above configuration, it is possible to improve the responsiveness of the plunger when the current to the electromagnetic coil that has been excited in the energized state is turned off to de-energize it.

A fluid passage through which a predetermined fluid passes is formed inside the plunger, and a groove leading from the fluid passage to a gap between the plunger and the guide is preferably formed in the end surface of the plunger.

Thus, a groove formed in the end face of the plunger leads from the fluid passage to the gap between the plunger and the guide. As a result, the air will be dispersed through the grooves to the fluid passageway without remaining in this gap. Therefore, it is possible to avoid air remaining in this gap.

A fluid passage through which a predetermined fluid passes is formed inside the plunger, and a hole leading from the fluid passage to a gap between the plunger and the guide is preferably formed in the plunger.

Thus, a hole formed in the plunger leads from the fluid passageway to the gap between the plunger and the guide. As a result, the air will be dispersed through the holes to the fluid passageway without remaining in this gap. Therefore, it is possible to avoid air remaining in this gap.

According to the present invention, it is possible to provide an electromagnetically driven pump that can easily adjust the discharge flow rate with a simple structure and can maintain the discharge flow rate with high accuracy.

FIG. 3 shows an electromagnetically driven pump in an embodiment of the invention; FIG. 2 is a diagram showing a main part of the electromagnetically driven pump of FIG. 1; FIG. 2 is a diagram for explaining the operation of the electromagnetically driven pump in FIG. 1; It is a figure which shows the modification of the electromagnetic drive pump of FIG.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in these embodiments are merely examples for facilitating understanding of the invention, and do not limit the invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are given the same reference numerals to omit redundant description, and elements that are not directly related to the present invention are omitted from the drawings. do.

FIG. 1 is a diagram showing an electromagnetically driven pump 100 according to an embodiment of the invention. FIG. 2 is a diagram showing a main part of the electromagnetically driven pump 100 of FIG. 1. As shown in FIG. The electromagnetic drive pump 100 is a pump that has the electromagnetic coil 102 shown in FIG. 1 and uses the electromagnetic coil 102 as power to transfer fluid (eg, water). Electromagnetic coil 102 is disposed within housing 104 .

A stationary core 106 , a cylindrical guide 108 , and a plunger 110 guided by the guide 108 are arranged inside the electromagnetic coil 102 . The fixed core 106 is molded integrally with the housing 104 .

Plunger 110 is arranged to face fixed core 106 and is movable inside electromagnetic coil 102 while being guided by guide 108 . A bobbin 112 made of resin, for example, is arranged outside the guide 108 . The electromagnetic coil 102 is formed by winding a wire around a bobbin 112 .

As shown in FIG. 2, a suction valve 114 is arranged inside the fixed core 106 . Suction valve 114 draws fluid into plunger 110 from the outside of electromagnetically driven pump 100 . A discharge valve 116 is arranged inside the plunger 110 . Discharge valve 116 discharges fluid within plunger 110 . The discharge valve 116 communicates with the discharge port 120 of the discharge port main body 118 shown in FIG. 1 and seals one end (the end on the discharge valve 116 side) of the cylindrical guide 108 .

Further, as shown in FIG. 2, the plunger 110 is formed with a fluid passage 122 through which fluid passes. Components such as the spring 124 and the discharge valve 116 are accommodated in the fluid passage 122 . The spring 124 urges the plunger 110 away from the fixed core 106 as indicated by arrow A in FIG.

Furthermore, end face 126 of plunger 110 and end face 128 of guide 108 shown in FIG. Electromagnetic drive pump 100 further comprises a metal spacer 132 and an elastic ring 134 .

Metal spacer 132 is a member made of a non-magnetic material, and is arranged in contact with end face 130 of fixed core 106 as shown in FIG. 2 to adjust the stroke of plunger 110 . The elastic ring 134 seals between the metal spacer 132 and the end face 128 of the guide 108 and biases the metal spacer 132 toward the end face 130 of the fixed core 106 .

3A and 3B are diagrams for explaining the operation of the electromagnetically driven pump 100 of FIG. FIG. 3A is a diagram showing a state in which the electromagnetic coil 102 is excited in the electromagnetically driven pump 100. FIG. FIG. 3(b) is a diagram showing a state when the current to the electromagnetic coil 102 excited in the energized state of FIG. 3(a) is turned off to de-energize it.

In the electromagnetic drive pump 100 , when the electromagnetic coil 102 is excited, an attractive force is generated between the electromagnetic coil 102 and the plunger 110 . The plunger 110 is pushed by the force of the spring 124 toward the metal spacer 132 arranged in contact with the end surface 130 (see FIG. 2) of the fixed iron core 106 as indicated by the arrow B in FIG. move against. Further, the plunger 110 stops moving when the end surface 126 (see FIG. 2) of the plunger 110 comes into contact with the metal spacer 132, as shown in FIG. 3(a).

That is, in electrically driven pump 100 , the stroke dimension of plunger 110 can be set by the thickness dimension of metal spacer 132 . As a result, when assembling the electromagnetically driven pump 100, the stroke dimension of the plunger 110 can be set with high precision to, for example, a specified value, simply by selecting and assembling the metal spacer 132 having an appropriate thickness dimension. can be done.

In the electrically driven pump 100, when the end surface 126 of the plunger 110 comes into contact with the metal spacer 132 as shown in FIG. increases. As a result, in the electrically driven pump 100, the discharge valve 116 is opened, and the fluid in the pump chamber 136 is discharged from the discharge valve 116 as indicated by arrow C in FIG. 3(a).

Therefore, according to the electrically driven pump 100, the stroke dimension of the plunger 110 can be set with high precision with a simple structure, so that the discharge flow rate can be easily adjusted and the precision of the discharge flow rate can be improved.

Also, the metal spacer 132 is biased toward the end surface 130 of the fixed core 106 by an elastic ring 134 . Therefore, in the electrically driven pump 100, the metal spacer 132 can be fixed to the end surface 130 of the fixed iron core 106 so as not to move, so that the ease of assembly can be improved.

Here, as shown in FIG. 3A, when the electromagnetic coil 102 is energized and the end surface 126 of the plunger 110 is in contact with the metal spacer 132, there is a gap between the end surface 130 of the fixed iron core 106 and the end surface 126 of the plunger 110. , a gap as a magnetic field is generated by the thickness of the metal spacer 132 made of a non-magnetic material.

Subsequently, when the current to the electromagnetic coil 102 is turned off while the end surface 126 of the plunger 110 is in contact with the metal spacer 132, the plunger 110 is attached to the spring 124 as indicated by arrow D in FIG. 3(b). It moves away from the fixed core 106 by force.

At this time, in the electrically driven pump 100, a magnetic gap exists between the end surface 130 of the fixed iron core 106 and the end surface 126 of the plunger 110, so that the end surface 126 of the plunger 110 is easily separated from the metal spacer 132, and the plunger 110 is moved. The biasing force of the spring 124 makes it easier to return, for example, to the initial position. Therefore, according to the electrically driven pump 100, the responsiveness of the plunger 110 can be improved when the current to the electromagnetic coil 102 that has been excited in the energized state is turned off to de-energize it.

In the electromagnetically driven pump 100, when the plunger 110 moves away from the fixed iron core 106 by the biasing force of the spring 124 as shown in FIG. 3B, the volume of the pump chamber 136 (see FIG. 1) increases, pressure becomes lower. As a result, in the electrically driven pump 100, the suction valve 114 is opened, and fluid is drawn into the pump chamber 136 from the outside as indicated by arrows E and F in FIG. 3(b).

As the plunger 110 moves, the fluid discharged from the discharge valve 116 indicated by the arrow C in FIG. 3(a) flows through the discharge port 120 as indicated by the arrow G in FIG. 3(b). be transported outside. In this way, the electromagnetically driven pump 100 alternately turns ON/OFF the current to the electromagnetic coil 102 to reciprocate the plunger 110 inside the electromagnetic coil 102, thereby transferring the fluid.

Furthermore, in the electromagnetically driven pump 100, since the elastic ring 134 seals between the metal spacer 132 and the end surface 128 of the guide 108, the metal spacer 132, the guide 108 and the bobbin 112 can also be sealed. Therefore, the fluid can be prevented from leaking to the bobbin 112 side.

Further, by sealing the space between the metal spacer 132, the guide 108 and the bobbin 112 with the elastic ring 134, air remaining around the guide 108 and the pump chamber 136, for example, can be cut off. As a result, according to the electromagnetically driven pump 100, it is possible to prevent air from being trapped in the pump chamber 136 and maintain an appropriate discharge flow rate according to the stroke of the plunger 110 with high accuracy.

FIG. 4 is a diagram showing a modification of the electromagnetically driven pump 100 of FIG. In the drawing, main parts of electromagnetically driven pumps 100A and 100B, which are modifications, are shown corresponding to a part of FIG.

Electromagnetically driven pump 100A differs from electromagnetically driven pump 100 in that plunger 110A is provided instead of plunger 110 as shown in FIG. 4(a). Plunger 110A has groove 138 . The groove 138 is formed in the end surface 126A of the plunger 110A and extends in the radial direction of the plunger 110A. Groove 138 also leads from fluid passageway 122 of plunger 110A to gap 140 between plunger 110A and guide 108 .

Therefore, the air will not remain in this gap 140 but will be dispersed through the groove 138 to the fluid passageway 122 . Therefore, in the electromagnetically driven pump 100A, it is possible to avoid air remaining in the gap 140. FIG.

The electromagnetic drive pump 100B differs from the electromagnetic drive pump 100 in that it includes a plunger 110B instead of the plunger 110 as shown in FIG. 4(b). Plunger 110B has hole 142 . Hole 142 is formed in plunger 110B and extends radially of plunger 110B. A hole 142 also leads from fluid passageway 122 of plunger 110B to gap 144 between plunger 110B and guide 108 .

As a result, the air will be dispersed through the holes 142 to the fluid passage 122 without remaining in this gap 144 . Therefore, in the electromagnetically driven pump 100B, it is possible to avoid air remaining in the gap 144 .

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is obvious that a person skilled in the art can conceive of various modifications or modifications within the scope described in the claims, and these also belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used as an electromagnetically driven pump that uses an electromagnetic coil as power.

DESCRIPTION OF SYMBOLS 100, 100A, 100B... Electromagnetic drive pump, 102... Electromagnetic coil, 104... Housing, 106... Fixed iron core, 108... Guide, 110, 110A, 110B... Plunger, 112... Bobbin, 114... Suction valve, 116... Discharge valve, DESCRIPTION OF SYMBOLS 118... Discharge port main body 120... Discharge port 122... Fluid passage 124... Spring 126, 126A... End face of plunger 128... End face of guide 130... End face of fixed iron core 132... Metal spacer 134... Elastic ring , 136 ... pump chamber, 138 ... plunger groove, 140, 144 ... clearance, 142 ... plunger hole

Claims (4)

An electromagnetic drive pump having an electromagnetic coil,
a fixed core disposed inside the electromagnetic coil;
a plunger moving inside the electromagnetic coil;
a cylindrical guide that guides movement of the plunger inside the electromagnetic coil;
The end face of the plunger and the end face of the guide are arranged to face the end face of the fixed core,
The electromagnetically driven pump further comprises:
a metal spacer disposed in contact with the end surface of the fixed core for adjusting the stroke of the plunger;
and an elastic ring that seals between the metal spacer and the end face of the guide and urges the metal spacer toward the end face of the fixed core. 2. The electromagnetic drive pump according to claim 1, wherein said metal spacer is made of a non-magnetic material. A fluid passage through which a predetermined fluid passes is formed inside the plunger,
3. The electromagnetically driven pump according to claim 1, wherein an end face of said plunger is formed with a groove leading from said fluid passage to a gap between said plunger and said guide. A fluid passage through which a predetermined fluid passes is formed inside the plunger,
3. The electromagnetically driven pump according to claim 1, wherein the plunger is formed with a hole leading from the fluid passage to a gap between the plunger and the guide.

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