JP2006300022A - Electromagnetic pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic pump which simplifies a structure, facilitates maintenance inspection and reduces cost by integrally forming a solenoid valve and pump mechanism. <P>SOLUTION: An electromagnetic pump 30 comprises a solenoid valve 31 and a pump part 32 engaged with the solenoid valve 31. In the pump part 32, a body 48 is engaged with a stopper 38 by a screw mechanism. A rod 43 of the stopper 38 is connected to one end of a piston 49 slidably inserted and fitted in the body 48 through the medium of a retainer 50a. The other end of the piston 49 is pushed by a spring member 51 engaged with a piston shaft 52 mounted in the body 48. Holes 53a, 53b are formed in both ends of the piston 49. A first and second pump mechanisms 60a, 60b are formed in the holes 53a, 53b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic pump, and more particularly to an improvement of an electromagnetic pump that can discharge liquid by operating two pump mechanisms provided on the left and right sides by operating an electromagnetic valve.

Conventionally, this type of electromagnetic pump 10 is provided with fixed magnets 12 and 13 at both ends of a housing 11 as shown in FIG. 5, and a sliding magnet 16 is slidably disposed in the internal space of the housing 11. The internal space is partitioned into pressure chambers 14 and 15. Fluid in the pressurizing chambers 14 and 15 is composed of fluid suction means 17 and 18 comprising a suction valve 17a, a suction port 17b and a suction valve 18a, and a suction port 18b, a discharge valve 19a, a discharge port 19b and a discharge valve 20a, and a discharge port 20b. Discharge means 19 and 20 are provided, respectively. Thus, when the sliding magnet 16 is slid across the stationary magnet 12 and 13 by making the stationary magnets 12 and 13 magnetic poles, the fluid in the pressurizing chamber 14 is discharged from the discharge port 19b. The air is sucked into the pressurizing chamber 15 from the suction port 18b (see, for example, Patent Document 1).
JP-A-7-279835

However, the electromagnetic pump 10 of Patent Document 1 is composed of fixed magnets 12 and 13, sliding magnets 16 and pressurizing chambers 14 and 15 inside a housing 11, and fluid suction means 17 and fixed magnets 12 and 13. 18 and fluid discharge means 19, 20 are provided. That is, the electromagnetic pump 10 is formed with the electromagnetic coil mechanism and the pump mechanism in the housing 11, so that the structure is complicated and the maintenance inspection becomes complicated. Further, the sliding magnet 16 and the fixed magnets 12 and 13 are magnet members, and the sliding magnet 16 moves in the housing 11 but is not suitable for the sliding member and is durable due to wear of the sliding magnet 16. Decreases.
Moreover, there is a problem that wear powder of the sliding magnet 16 is generated and enters between the magnet 16 and the fixed magnets 12 and 13 to reduce the pump performance. The present invention is made to solve the above-mentioned problems. By integrating the solenoid valve with the electromagnetic coil mechanism and the pump body with the pump mechanism, the structure is simplified, maintenance and inspection are easy, wear measures for the pump part can be easily taken, and cost is reduced. It is an object of the present invention to provide an electromagnetic pump that can be used.

In order to achieve the above object, the invention according to claim 1 is a solenoid valve member;
A pump member liquid-tightly engaged with the electromagnetic valve member;
With
A two-system pump mechanism is provided by the excitation and non-excitation operations of the solenoid valve member.
According to the present invention, since the dual-system pump mechanism is provided, the liquid can be supplied to a plurality of locations for multiple purposes, so that the pressure loss of the liquid due to the pipe resistance can be reduced, and the liquid is reliably supplied to the supply location. Is possible. Moreover, since the two pumps discharge the same flow rate, the flow rate can be distributed at a lower cost without adjustment than the method of dividing the pump into two systems by a valve from one pump.
In the invention of claim 2, the pump member is
A pump body engaged with the solenoid valve member;
A piston member slidably fitted in a hole provided in the pump body;
A first and a second pump mechanism that communicates with the hole and is connected to both ends of the piston member; a spring member that is provided in the pump body and presses the piston member;
Therefore, the structure can be simplified and the size can be reduced. In addition, the piston member and the main body can be made of a material that is not related to electromagnetic characteristics, can be subjected to wear resistance, low friction material, and surface treatment, and can improve durability.

In the invention of claim 3, the first and second pump mechanisms are
First and second pump chambers formed in the pump body;
First and second suction passages communicating with the first and second pump chambers;
First and second suction check valves provided in the middle of the first and second suction passages;
First and second discharge passages communicating with the first and second pump chambers;
First and second discharge check valves provided in the middle of the first and second discharges;
Since the pump body is provided in a collective manner, the pump member can be made compact, which is preferable.
In the invention according to claim 4, when the first and second pump mechanisms are provided substantially orthogonally and in parallel to the piston member, the liquid flow path can be shortened, and the discharge pressure of the liquid This is preferable because it is possible to prevent a decrease in the thickness.
In the invention according to claim 5, when a seal member is attached to the outer peripheral surface of the piston member or the hole of the pump body into which the piston member is fitted, two types of liquid can be discharged. The discharge efficiency can be improved.
Furthermore, liquids with different applications can be discharged with one electromagnetic pump, and the operating rate of the electromagnetic pump can be improved.
In the invention according to claim 6, when the pair of seal members are provided at equal intervals in the axial direction around the discharge passage communicating with the hole of the pump body, liquids having different attributes can be supplied, Diversification of electromagnetic pumps can be achieved.

  Since the present invention has two pump mechanisms, the liquid can be supplied to a plurality of locations for multiple purposes, the pressure loss of the liquid due to the piping resistance can be reduced, and the liquid can be reliably supplied to the supply location. It is.

An electromagnetic pump according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a schematic structure of an electromagnetic pump 30 according to the first embodiment of the present invention.
As shown in FIG. 1, the electromagnetic pump 30 basically includes an electromagnetic valve 31 that generates a suction force and a pump unit 32.

  The coil unit 31 includes an electromagnetic coil 34 that generates a magnetic field, a coil body 33 including a coil bobbin 35 and rings 36 and 37 that serve as external magnetic paths, and a stopper 38 that functions as a fixed iron core when a magnetic field is applied. A plunger 39 which is a movable iron core to be sucked, a guide 40 for supporting the plunger 39 and applying a magnetic field to the plunger 39, and a magnetic field flows from the guide 40 to the stopper 38 via the plunger 39. It is formed from the sleeve main body 42 provided with the welded nonmagnetic material 41. In this case, the electromagnetic coil 34 is mounted on the coil bobbin 35 and is inserted into the coil bobbin 35 together with the links 36 and 37, and is inserted into a mold (not shown), and the coil body 33 is molded by an injection molding machine. .

A rod 43 formed integrally with the plunger 39 is inserted into the stopper 38 so as to be displaceable at an axial center thereof, and one end of the plunger 39 is retained by a piston (piston member) 49 of the pump portion 32. 50a is connected.
When the coil portion main body 33 and the sleeve main body 42 are assembled, the sleeve 44 is inserted into the hole 33a of the coil portion main body 33, and the fixing nut 46 is attached to the screw portion 45a formed on the boss portion 45 of the sleeve 44. It is screwed. Further, the protrusion 47 formed at one end of the stopper 38 is joined to a screw mechanism 59 a formed in a hole 53 a that is a pump chamber of a main body (pump main body) 48 of the pump portion 32.

A piston 49 is slidably fitted on the body 48 so as to be slidable on the same axis as the stopper 38. One end of the piston 49 is joined to the rod 43 by a retainer 50a, and the other end is a spring member by a retainer 50b. It is joined to the piston shaft 52 via 51. The piston shaft 52 is provided in a boss portion 54 screwed to a screw mechanism 59b in a hole portion 53b that is a pump chamber opened on an end face of the main body 48 so as to be able to advance and retract in the screw mechanism. When displaced, the elastic force of the spring member 51 is adjusted. Therefore, by adjusting the elastic force of the spring member 51, the attractive force by the excitation of the electromagnetic valve 31 acting on the piston 49 is controlled, and the return force of the piston 49 when the electromagnetic valve 31 is not excited is adjusted. .
On the other hand, suction passages 55a, 55b and discharge passages 56a, 56b are formed in the holes 53a, 53b in which the retainers 50a, 50b are provided, substantially perpendicular to the axial direction of the piston 49. The suction passages 55a and 55b communicate with a tank device (not shown) that stores liquid, and the discharge passages 56a and 56b are connected to a gear device and a bearing device (not shown) that are liquid supply destinations. .

  Further, suction check valves 57a and 57b and discharge check valves 58a and 58b are provided in the middle of the suction paths 55a and 55b and the discharge paths 56a and 56b, respectively. Therefore, the suction check valves 57a and 57b are opened when the liquid flows from the suction paths 55a and 55b to the discharge paths 56a and 56b, and the reverse flow direction, that is, the liquid flows from the discharge paths 56a and 56b to the suction paths 55a and 55b. Sometimes block. The discharge check valves 58a and 58b are opened when the liquid flows from the suction paths 55a and 55b to the discharge paths 56a and 56b, and the liquid flows from the discharge path 56a and the discharge path 56b in the reverse flow direction to the suction paths 55a and 55b. Sometimes block. Here, the first pump mechanism 60a is formed by the suction path 55a, the discharge path 56a, the suction check valve 57a, and the discharge suction valve 58a, and the suction path 55b, the discharge path 56b, the suction check valve 57b, the discharge check valve The second pump mechanism 60b is formed by 58b.

The electromagnetic pump 30 according to the first embodiment of the present invention is basically configured as described above, and the operation of the electromagnetic pump 30 will be described with reference to FIG.
FIG. 2A shows a state where the electromagnetic coil 34 is not excited (OFF). In this state, the piston 49 is displaced in the direction of the arrow X via the retainers 50b and 50a by the elastic force of the spring member 51. Therefore, the rod 43 is displaced in the arrow X direction together with the plunger 39. At that time, the hole 53b is held in a negative pressure state because the piston 49 is displaced in the direction of the arrow X and pulled. Accordingly, the suction check valve 57b is opened, and the liquid enters the hole 53b from the suction passage 55b via the suction check valve 57b, and the liquid is filled in the hole 53b.
On the other hand, since the piston 49 enters the hole 53a due to the elastic force of the spring member 51, the discharge check valve 58a is opened by the pressure of the liquid filled in the hole 53a, and the hole 53a The liquid is discharged from the discharge path 56a through the discharge check valve 58a.

Next, as shown in FIGS. 2B and 2C, when the electromagnetic coil 34 is energized (ON), the plunger 39 is displaced in the arrow Y direction because it is attracted to the stopper 38. Therefore, the piston 49 is pressed by the rod 43 through the retainer 50a, and the spring member 51 is bent in the arrow Y direction by the retainer 50b. Accordingly, since the piston 49 enters the hole 53b, the suction check valve 57b is closed and the discharge check valve 58b is opened, so that the liquid in the hole 53b is discharged from the discharge check valve 58b and the discharge path 56b. Discharged.
In this case, since the piston 49 is displaced in the arrow Y direction and protrudes from the hole 53a, the hole 53a is maintained in a negative pressure state. As a result, the discharge check valve 58a is closed and the suction check valve 57a is opened, so that liquid is sucked into the hole 53a from the suction passage 55a and filled into the hole 53a. 2B shows a state immediately after the electromagnetic coil 34 is excited, and FIG. 2C shows a holding state where the electromagnetic coil 34 is excited.

  FIG. 2D shows a state immediately after the electromagnetic coil 34 is not excited. That is, when the electromagnetic coil 34 is de-excited, the piston 49 displaces the rod 43 in the direction of the arrow X via the retainer 50b by the elastic force of the spring member 51. When the rod 43 is displaced together with the plunger 39 in the arrow direction X, the hole 53b is held in a negative pressure state, the suction check valve 57b is opened, and the liquid passes through the suction check valve 57b from the suction passage 55b. The hole 53b is inserted and filled.

FIG. 3 is a longitudinal sectional view showing a schematic structure of the electromagnetic pump 70 according to the second embodiment of the present invention. In FIG. 3, the same components as those of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. The same applies to the following description.
The electromagnetic pump 70 shown in FIG. 3 has a substantially central portion in the axial direction of the piston 71, in other words, a suction path 55a, a discharge path 56a and a suction path 55b that form first and second pump mechanisms 60a and 60b. An O-ring 72, which is a seal member, is mounted at a substantially central portion of the space between the discharge path 56b and the suction path 55a, the discharge path 56a, the suction path 55b, and the discharge path 56b are shut off in a liquid-tight manner. As a result, liquids having different uses, such as lubricating oil, can flow through the first and second pump mechanisms 60a and 60b, respectively.
In FIG. 3, the O-ring 72 is mounted on the outer periphery of the piston 71, but a groove (not shown) of the O-ring 72 may be mounted in the hole 73 into which the piston 49 is inserted.
The O-ring of the seal member may be a seal member such as a V packing.

FIG. 4 is a longitudinal sectional view showing a schematic structure of an electromagnetic pump 80 according to the third embodiment of the present invention. In FIG. 3, the same components as those of FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
The electromagnetic pump 80 has a pair of O-rings 82a and 82b attached to the outer peripheral portion thereof in the axial direction of the piston 81 with a space therebetween, and a hole (not shown) in the body 48 in the middle of these O-rings 82a and 82b. No) is provided with an annular groove 84, and a discharge passage 85 communicating with the annular groove 84 is formed. The discharge path 85 has a drain function of the liquid flowing through the first and second pump mechanisms 60a and 60b.
Thereby, it is possible to supply different types of liquids, for example, a water-soluble liquid, an oil-based hydraulic fluid, and cleaning oil, to the first and second pump mechanisms 60a and 60b, respectively.
The present invention can provide a multipurpose electromagnetic pump by engaging a solenoid valve member and a pump member and forming a pump mechanism of the pump member.

It is a longitudinal section showing the schematic structure of the electromagnetic pump concerning a first embodiment of the present invention. It is operation | movement explanatory drawing of the electromagnetic pump of FIG. It is a longitudinal cross-sectional view which shows schematic structure of the electromagnetic pump which concerns on 2nd embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the electromagnetic pump which concerns on 3rd embodiment of this invention. It is a longitudinal cross-sectional view which shows schematic structure of the conventional electromagnetic pump.

Explanation of symbols

30, 70, 80 Electromagnetic pump 31 Electromagnetic valve 32 Pump part 33 Coil part 34 Electromagnetic coil 38 Stopper
39 Plunger 43 Rod 48 Body 49, 71, 81 Piston 53a, 53b Hole 55a, 55b Suction path 56a, 56b Discharge path 57a, 57b Suction check valve 60a, 60b Pump mechanism 84 Drain

Claims (6)

A solenoid valve member;
A pump member liquid-tightly engaged with the electromagnetic valve member;
With
An electromagnetic pump comprising a two-system pump mechanism by exciting and de-energizing the electromagnetic valve member. The electromagnetic pump according to claim 1,
The pump member is
A pump body engaged with the solenoid valve member;
A piston member slidably fitted in a hole provided in the pump body;
First and second pump mechanisms that communicate with the hole and are connected to both ends of the piston member; and spring members that are provided in the pump body and press the piston member;
An electromagnetic pump characterized by comprising: The electromagnetic pump according to claim 1 or 2,
The first and second pump mechanisms are
First and second pump chambers formed in the pump body;
First and second suction passages communicating with the first and second pump chambers;
First and second suction check valves provided in the middle of the first and second suction passages;
First and second discharge passages communicating with the pump chamber;
First and second discharge check valves provided in the middle of the first and second discharge paths;
An electromagnetic pump comprising: The electromagnetic pump according to claim 3,
The electromagnetic pump according to claim 1, wherein the first and second pump mechanisms are provided substantially orthogonal to and parallel to the piston member. The electromagnetic pump according to any one of claims 1 to 4,
An electromagnetic pump, wherein a seal member is attached to an outer peripheral surface of the piston member or a hole portion of the pump body into which the piston member is fitted. The electromagnetic pump according to claim 5, wherein
The electromagnetic pump according to claim 1, wherein a pair of the sealing members are provided at equal intervals in the axial direction around a discharge passage communicating with a hole of the pump body.

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