JPS61258976A - Solenoid-driven reciprocating pump - Google Patents

Abstract

PURPOSE:To omit movable iron core guide and to increase electric resistance of the movable iron core by arranging the movable iron core inserted through a solenoid without employing the movable iron core guide on an inner circumference of a stationary iron core of the solenoid and by furnishing insertion holes for both the stationary and movable iron cores with bearings made of plastic sheet. CONSTITUTION:A stationary iron core 18 and a movable iron core 20 are arranged such that a stabilized small gap 60 is secured between the inner circumference of a bobbin 52 of an excitation coil 50 in the stationary iron core 18 of a solenoid 12 and the periphery of a movable iron core 20. A shaft insertion hole 56 and a movable iron core insertion hole 62 through the said stationary iron core 18 are respectively equipped with sheet-like bearings 64's made of fluorine-based plastic having excellent self-lubricating and electric resistance properties for respectively bearing a shaft 26 and the movable iron core 20. In addition, the said movable iron core 20 is constituted with silicon steel having greater electric resistance than mild steel or ferrite formerly used.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to an electromagnetically driven reciprocating pump mainly used for pumping chemical liquids, which performs pumping operation by displacing a diaphragm using the driving force of a solenoid. In particular, it relates to improvements in electromagnetic drives.

[Prior art and its problems]

Conventionally, as a drive device for a reciprocating pump using a diaphragm, an electromagnetically driven reciprocating pump has been implemented, which uses a solenoid and performs a pump operation by displacing the diaphragm by reciprocating the movable core of the solenoid.

FIG. 2 shows a configuration example of this type of electromagnetically driven reciprocating pump. In FIG. 2, reference numeral 10 indicates a pump casing, and a solenoid 12 is housed at one end of the bomb casing 10, and a diaphragm head 16 is attached to that end via an adapter 14. The solenoid 12 consists of a cylindrical fixed core 18 and a movable core 20 inserted into the fixed core 18.
A spring holder is provided with a member 22 at one end of the spring holder, and by interposing a spring 24 between the member 22 and the fixed iron core 18, the movable iron core 20 is moved in a certain direction against the elasticity of the spring 240. Configure to move to . Therefore, a shaft 26 is attached to the center of the movable iron core 20, and the tip of the shaft 26 is coupled to one side of a diaphragm 30 provided to the pump chamber 28 of the diaphragm head 16.

The diaphragm head 16 has fluid suction pipe portions 32 that communicate with the pump chambers 28 formed inside.
and a fluid discharge pipe section 34 are connected and arranged, and each pipe section 32,
A suction valve (not shown) and a discharge valve 36 are provided within the fluid discharge pipe 34, and an air bleed joint 38 is appropriately attached to a portion of the fluid discharge pipe 34. On the other hand, inside the pump casing 10, the movable iron core 20 of the solenoid 12
A spring receiver provided at one end has a stroke adjustment shaft 40 disposed opposite to the member 22, and this stroke adjustment shaft 40 is screwed onto a support frame 42 provided at the other end of the pump casing 10. Then, a stroke adjustment knob 44 is attached to the tip thereof. In this case, a power supply connection unit 46, the stroke adjustment knob 44, and other adjustment means are provided on the side surface of the other end of the pump casing 10, and a protective cover 48 surrounding the adjustment means is attached to and removed from the power supply connection unit 46, the stroke adjustment knob 44, and other adjustment means. It can be installed freely.

In the electromagnetically driven reciprocating pump configured in this way, by energizing the solenoid with a required pulse signal, the movable iron core 20 causes a constant reciprocating motion, and the diaphragm 30
Pump operation can be achieved by applying a displacement to

However, as shown in FIG. 3, the solenoid 12 constituting the electromagnetic drive unit in a conventional electromagnetically driven reciprocating pump is attached to the inner circumferential surface of the winding frame 52 of the excitation coil 50 provided on the inner circumferential portion of the fixed iron core IB. 5. A movable core guide made of brass tube or aluminum tube. i is attached to the movable core guide 54, and the movable core 20 is configured to smoothly reciprocate inside the movable core guide 54.

The solenoid configured in this way has a movable core guide 5.
4 and the insertion hole 56 of the fixed core 18 through which the shaft 26 is inserted.
short circuit currents and eddy currents occur. Furthermore, since the movable core 20 reciprocates in contact with the inner surface of the movable core guide 54, mechanical PJ friction loss occurs, and in some cases, it may not be possible to maintain a predetermined stroke length. Instead, electrolytic corrosion occurs between the movable core guide 54 and the movable core 20 and between the insertion hole 56 of the fixed core 18 and the shaft 26 due to eddy currents generated when electricity is applied. This means that
This significantly deteriorates the efficiency of the solenoid, inhibits the current rise during energization, and significantly delays the time it takes for the movable core 20 to be attracted to the fixed core 18. That is, in order to obtain a predetermined performance, a large amount of power is required, which heats the #magnetic coil 50 and increases the temperature rise of the entire solenoid.

In addition, electrolytic corrosion occurring in the sliding parts and wear due to solid friction cause deterioration of various parts, again deteriorating electrical characteristics, and causing many problems in terms of reliability and durability.

[Purpose of the invention]

The purpose of the present invention is to eliminate the conventionally used movable core guide by stabilizing the shaft support of the movable core, increase the electrical resistance of the movable core, improve the electrical characteristics, and improve thermal and mechanical properties. It is an object of the present invention to provide an electromagnetic drive type reciprocating pump equipped with an electromagnetic drive unit having excellent durability and reliability.

(Summary of the Invention) An electromagnetically driven reciprocating pump according to the present invention is an electromagnetically driven reciprocating pump configured to perform pump operation by coupling a shaft provided integrally with a movable core of a solenoid to a diaphragm provided in a diaphragm head. In the dynamic pump, the movable core is inserted through the inner circumference of the fixed core of the solenoid without providing a movable core guide, and bearings made of resin sheets are mounted in the shaft insertion hole and the movable core insertion hole of the fixed core. It is characterized by supporting a movable iron core.

In the electromagnetically driven reciprocating pump described above, the bearing is made of a fluorine-based resin sheet, thereby smoothing the sliding motion of the movable core and contributing to improving the mechanical effect of the solenoid.

In addition, the configuration is such that a slight gap is maintained between the inner peripheral surface of the excitation coil winding frame provided on the fixed core and the outer peripheral surface of the movable core, and the movable core is constructed of silicon steel. This contributes to improving the electrical efficiency of the solenoid.

[Embodiments of the invention]

Next, embodiments of the electromagnetically driven reciprocating pump according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the electromagnetically driven reciprocating pump of the present invention, and is a sectional view of a main part of an electromagnetic drive section, that is, a solenoid. For convenience of explanation, the same reference numerals are given to the same components as those shown in FIGS. 2 and 3, and detailed explanation thereof will be omitted.

That is, in this embodiment, there is a stable slight gap 60 between the inner peripheral surface of the winding frame 52 of the excitation coil 50 in the fixed iron core 18 of the solenoid 2 and the outer peripheral surface of the movable iron core 20.
The fixed iron core 18 and the movable iron core 20 are arranged. Furthermore, bearings 64 made of a sheet-like fluorine-based resin having excellent self-lubricating properties and electrical insulation properties are installed in the shaft insertion hole 56 and the movable core insertion hole 62 of the fixed iron core 18, respectively. The movable iron core 20 is pivotally supported. Furthermore, the movable iron core 20 is constructed using silicon steel, which has a higher electrical resistance than conventional mild steel or pure iron.

Next, the operation of the solenoid having the above structure will be explained. In the present invention, conventional fixed iron core 18 and movable iron core 2
By omitting the movable core guide provided between the movable core 2 and the movable core 2, it is possible to eliminate short-circuit currents and eddy currents that occur in the guide immediately after energization.
0 made of silicon steel, it is possible to reduce short circuit currents and eddy currents that occur in the movable core 20. This improves the rise of the current when the excitation coil 50 is energized and improves the responsiveness of the movable core 20. It is possible to achieve speed reduction and reduction in power consumption. In addition, in the present invention, since the movable core guide is omitted as described above, in order to ensure the pivoting of the movable core 20, the shaft insertion hole 56 of the fixed core 18 and the movable core insertion hole 62 are filled with fluorine-containing material. By providing the resin sheet-shaped bearing 64, it is possible to prevent leakage of short circuit current and generation of eddy current in the bearing 64 part, stabilize the electrical characteristics of the solenoid, and also stabilize the shaft due to the self-lubricating property unique to the resin. 26 and the movable core 20 can be made to slide smoothly, and the mechanical properties of the solenoid can also be improved.

Therefore, in the present invention, by incorporating the solenoid having the above configuration into the pump mechanism shown in FIG. 2, it is possible to easily realize a small, highly reliable electromagnetically driven reciprocating pump with excellent quantitative performance.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention,
By improving the electromagnetic drive part, or solenoid, of electromagnetically driven reciprocating pumps, we have improved electrical and mechanical efficiency, while also being thermally stable, allowing us to replace the synthetic resin casing, which has relatively poor heat resistance. In addition to being compact and inexpensive to use, this synthetic resin pump casing is also effective when pumping chemical liquids, where the electromagnetically driven reciprocating pump of the present invention can exhibit its performance characteristics. Conventional technology has no choice but to use a metal bomb casing, which is easily corroded by the atmosphere due to excessive heat generation during use, as it is resistant to atmospheres such as chemical droplets and gases. The technique is incomparably more durable and reliable! A space-acting reciprocating pump can be obtained.

Although the preferred embodiments of the present invention have been described above, it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing an embodiment of an electromagnetically driven reciprocating pump according to the present invention, FIG. 2 is a cross-sectional side view of essential parts showing the overall configuration of the electromagnetically driven reciprocating pump, and FIG. FIG. 2 is a cross-sectional view of main parts showing the configuration of a conventional electromagnetically driven reciprocating pump. 10. Pump casing 12. ,,Solenoid 1
4. Adapter 16. , , diaphragm head 1B, , fixed core 20. ,, Movable iron core 22), Spring receiver is a member 24. ,,spring 26, ,shaft 2B, ,pump chamber 30,
,,diaphragm 32. , , fluid suction pipe section 34
,,,Fluid discharge pipe section 36. , Discharge valve 3B, Air bleed joint 40, Stroke adjustment shaft 42), Support frame 44, Stroke adjustment knob 46, Power connection unit) 4B, Protective cover 50, Excitation Coil 52. , , winding frame 54,
,, Movable core guide 56. ,,shaft insertion hole 60,
,,gap 62. ,, movable core insertion hole 64,
,, Bearing patent applicant Nikkiso Eiko Co., Ltd. FIG, -1 tsu FIG, 3 Procedural amendment! (June 25, 1985, Mr. Manabu Shiga, Commissioner of the Patent Office1, Indication of the case, Patent Application No. 99471, filed in 19852) Name of the invention: Electromagnetic Color I Capital Exercising Rib Pump 3, Amendment Person Case Relationship Patent applicant address 2-27-10 Ebisu, Hoya-ku, Tokyo Name
Nikkiso Eiko Co., Ltd. Ikei Naotake Sakai 4, Agent FIG, (L2 Eid,

Claims (4)

[Claims] (1) In an electromagnetically driven reciprocating pump configured to perform pump operation by coupling a diaphragm provided in the diaphragm head with a shaft provided integrally with the movable core of the solenoid, the movable core is attached to the inner circumference of the fixed core of the solenoid. An electromagnetic drive type, characterized in that a movable core is inserted through and arranged without providing a core guide, and bearings made of a resin sheet are attached to the shaft insertion hole of the fixed core and the movable core insertion hole to pivotally support the movable core. Reciprocating pump. (2) An electromagnetically driven reciprocating pump according to claim 1, wherein the bearing is made of a fluorine-based resin sheet. (3) In the electromagnetically driven reciprocating pump according to claim 1, a stable slight gap is provided between the inner peripheral surface of the winding frame of the excitation coil provided on the fixed iron core and the outer peripheral surface of the movable iron core. An electromagnetic drive type reciprocating pump configured to hold. (4) An electromagnetically driven reciprocating pump according to claim 1, wherein the movable core is made of silicon steel.