JPS5838388A - Feed pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a feed pump having a piston disposed in one chamber, the piston being movable forward by a magnetic field generated by a coil and capable of double interlocking by a return force. , and further in the direction of movement of the piston,
The piston is of the type in which the piston is pierced by a passage which is arranged and provided with a reverse valve.

Feed pumps have already been developed in which a piston is attracted by a magnetic field, which simultaneously compresses a spring, which acts as a force store and moves the piston back after the magnetic field has died. It is publicly known.

Such a magnetic field must exert a necessary conveying pressure to further compress the spring, which significantly increases the dimensions of the coil.

In contrast to the above-mentioned prior art, which is the starting point of the present invention, a second magnetic field is provided for pulling back the piston,
The advantage of the feed pump according to the invention, characterized in that this magnetic field coil is arranged at a distance from the first magnetic field coil, is that one of the two coils carries only the conveying pressure and the other Since only the return force needs to be applied, both coils can be kept relatively small. A narrow pump construction is thereby obtained.

Advantageous embodiments of the invention are defined in the claims 2 to 15. A particular advantage is that the conveying pressure can be significantly increased by the means described below in the light section.

The invention will now be explained with reference to the illustrated embodiment.

The feed pump shown in FIG. 1 has a split casing 10 consisting of d2' casing halves 12, 14. Each casing half 12.14 has a core l (i or 18) in its center. Core 16.1
8 are each surrounded by an electromagnetic coil 20 or 22.

Cores ]6 and ]8 are coaxially located with each other.

The end faces facing each other form pole faces 24,26. The pole faces 24,26 are arranged at a distance from each other. The seam 28 between the two housing halves 12, 14 is located in a plane located between the two pole faces 24 and 26. Each core 16.18 has a bottom plate 30
or 32 to an annular wall 34 or 36, and this annular wall 34', 36 is connected to the bottom plate 30 or #32.
32 to form the respective casing half, section 12 or 14, and together with the other casing half to form the coil 2o.
or the yoke of the magnetic field produced by 22 (
30°, 32.34.36).

The two cores 16 , 18 and the electromagnetic coils 20 , 22 assigned to them are located at a distance from each other and form a chamber 38 inside the casing 10 . This room 38
A piston 4° is disposed within the piston so as to be freely movable from one pole face 24 to the other pole face 26. For guiding the piston 40, the piston 40 ij:,
It is surrounded 1 by a guide ring 42 which is integrally connected to the annular wall A6 of the housing half 14.

The core 18 has a central hole 44, which hole 4,1 serves as an inlet for the reservoir of liquid to be conveyed. A blind hole 46 is formed starting from the magnetic and negative surface 2.1 of the core 16, and an additional portion 48 of the piston 4o is inserted into this blind hole 46. The extension 48 of the piston 4o has a smaller cross-sectional area than the piston 10, measured at right angles to the direction of movement of the piston.
A pressure chamber for the piston attachment portion 48 is formed into a shape, and the piston attachment portion 48 is slidably disposed within the pressure chamber. A discharge hole 5° with a check valve 52 (i+iii) connected thereto is connected to the pressure chamber 46. Furthermore, the piston 4o has a through hole 54 which extends by λ in the direction of movement of the piston and which also passes through the piston extension 48; within the area of the opening of the through hole 54 on the extension side there is also a non-return stop. A valve 56 is provided.

Next, the mode of operation of this feed pump will be explained.

The electromagnetic coils 20, 22 are alternately energized, thereby causing the piston 4o to reciprocate together with the extension 48 which is integrally connected to the piston. Chamber 38 is pressure chamber 46
If the electromagnetic coil 20 is excited and the piston 4o comes into contact with the magnetic pole face 24, the piston attachment part 48 will be filled with the liquid to be conveyed.
The liquid will be pushed out from 6. Subsequent liquid flows into chamber 38 through hole 44 and is replenished. When the electromagnetic coil 2o is cut off and the electromagnetic coil 22 is excited, the piston 40 is pulled toward the magnetic pole face 26,
At this time, the liquid that was under the piston 40 passes through the through hole 54 that serves as a passage, and then overflows into the pressure chamber 46 when the check valve 56 is opened, and then flows into the next electromagnetic coil 2.
When energizing the piston 40, the subsequent transport stroke of the piston 40 takes place. The piston 40 is directly connected to the liquid to be conveyed by J! In known electromagnetic pumps which operate without IJ additions, there are certain limits to the achievable delivery pressure, which limits result from saturation induction of the ferromagnetic piston. However, in the construction of the present invention, the cross-sectional area ratio between piston 40 and extension 48 is 4:1. Driving force F
(maximum force) is the strength (square of saturation induction of straight piston °
is proportional to the cross-sectional area A1 of the piston. The maximum jrj7 pressure 1'max occurs as the quotient of the maximum force and the smaller traverse of the piston...1 product A2. Therefore, Pma
The formula x −132·AV'A2 holds true. By means of the cross-sectional area ratio, the maximum pressure at a given saturation induction can thus be adjusted according to the requirements in question.

This idea also applies convexly if the piston 40 is permanently magnetized in the axial direction, but the guide ring 42 is rigid. In this case the core is brought alternately to both limit positions by current pulses flowing through both coils in the same direction, where the equation applies for the residual adhesion force in the non-conducting state. .

Another embodiment is conceivable with a ferromagnetic piston 40 and a radially permanently magnetized guide ring 42. When viewed in a line or in parallel (by energizing a plurality of connected cores alternately, the magnetic current changes in opposite directions according to the energizing current in both magnetic pole gaps,
This causes the piston 40 to reciprocate.

In this case, the saturation induction of the piston 40 in a given cross-sectional area defines the driving force in question.

The cross-sectional area ratio determines the achievable conveying pressure.

FIG. 2 shows a further embodiment according to the principles of the embodiment shown in FIG. Therefore, members that overlap with each other are given numerals with 100 added to the numerals in the example of FIG. The difference between these two embodiments is that in the embodiment of FIG. 2, the additional portion is formed by a tubular member 148.
48, two pistons 140, 141 are arranged 1.11 at a distance of 14 from each other.

Both pistons of the tubular member 148]ll+1.

14] is surrounded by a guide ring 143. Both Bistones] /10,14
1 is also assigned a guide ring 142, which guide ring is connected to the annular wall of each casing half], 3
4, fixed at 136. Furthermore, each piston 140
and 14+ are respectively assigned two electromagnetic coils 120, 121 or 122, 123 which are spaced apart from each other.

The type of feed pump shown in FIG. 2 is completely the same as previously described. Double power piston 140, 14
1 in series and also the arrangement 11' of the two pairs of electromagnetic coils acting on the piston, the achievable force is reduced by 200 mm compared to the case with one piston, as shown in FIG.
It is twice the size. The pressure is lateral h between the piston and the tubular section.
It is set using the area ratio.

Also in the embodiment shown in FIG.
2, 143 may be made of ferromagnetic material and each electromagnetic coil 120, 121, 122, 123 may be connected to each other such that both pistons are driven in the same direction when current is supplied. In such cases it is advantageous if both pistons 140, 141 are permanently magnetized in the axial direction.

Another possibility is to manufacture the pistons 140, 141 and the guide ring 143 from ferromagnetic material and to form the guide ring 142 magnetically hard and radially magnetized.

The achievable force in this case is higher because the effective gap is smaller even though the maximum force does not rise as limited by saturation induction.

The embodiment shown in FIG. 3 also corresponds in principle to the previously described embodiments, and corresponding parts are therefore provided with the reference numerals used in FIG. 1 plus 200. Second
The difference from the illustrated embodiment is that in this embodiment of FIG. 3, the two pistons 240, 241 are mechanically independent of each other. Each piston is located within a chamber 238 or 239. The compartments are separated by intermediate plates 243. The through holes 245 in the intermediate plate 243 act as pressure passages, whereby the liquid to be conveyed is directed to the chamber 239.
can flood into the chamber 238. Piste 72
/IO.

241 is provided with a check valve 256 or 257, respectively. Furthermore, each piston 210.

211 has a coil pair 220.221 or (r-f-222
゜223 is assigned.

- as described in (1) directly
It is clear that a pressure increase proportional to the number of tons 240 or 241 is obtained.

In this embodiment as well, the guide rings 2, 12 or the intermediate plate 243 are made of ferromagnetic material, and the piston 2
'40, 241 can be permanently magnetized.

Alternatives to fabricating the core from a ferromagnetic material and forming the guide ring 242 magnetically hard and radially magnetized are also feasible, such as by increasing the pressure or:
resulting in a reduction in the amperage circuit of the ile. 2 and 3 is a multi-stage pump, in which both piston forces (in the embodiment of FIG. 2) are connected to each other via a tubular member. Furthermore, in the embodiment shown in FIG. 3, two single pumps, which are already known in their construction, are connected in series and their respective pressures are summed.

[Brief explanation of the drawing]

The drawings show several embodiments of the invention, the first
The figure is a sectional view showing a first embodiment of a feed pump according to the present invention, FIG. 2 is a sectional view showing a second embodiment, and FIG. 3 is a sectional view showing a third embodiment. . 10... Casing, 12, 14... Casing half, 16.18... Core, 20, 22, 120° 121.
123, 220, 221.222゜223... Electromagnetic coil, 24, 26, 1be pole + fii, 2800th body, 30.32 ・Bottom plate, 3=I, 36゜13
4.136...Annular wall part: U8, 238. 239・room, 40,140,141.2・10゜241
...Piston, 42,142,1 13°242 ・
Guide ring, 44...hole, 46 blind hole (pressure chamber), 4
8...Additional part, 50/Drain hole, 52°56.256.
257...Check valve, 5-1, 2115...Through hole, ]48...Tubular section, 149-Division, 243-...
intermediate plate

Claims (1)

[Scope of Claims] A feed pump having a piston arranged in eleven chambers, the piston being capable of forward movement by a magnetic field produced by a coil and double interlocking by a return force, In addition, in a type in which the piston is penetrated by a passage arranged in the direction of movement of the piston and provided with a check valve,
40, 1.41 or 240, 241), a second magnetic field is provided, the coil (22) of this magnetic field being arranged at a distance from the coil (20) of the first magnetic field. A feed pump characterized by: 2 Both electromagnetic coils (20 or 22) are surrounded in a casing shape by a divided common yoke (30, 32, 34, 36), and the valley casing ten parts (12
, 14) has a core (16, 18) surrounded by a coil (20, 22), said core ('16.18
) A piston (-10) is arranged between the magnetic pole surfaces (24, 26) facing each other, and this magnetic pole surface (24
, 26) is larger than the dimension of the piston (40) measured in the direction of movement of the piston (40).
! The feed pump according to item 1, in which the range of Ijl' + t'11g is determined. 3. The piston (40) is provided with an extension (48) extending into the pressure chamber (46) in the direction of movement of the piston, the cross section of this extension (ll8) extending into the pressure chamber (46).
2. The feed pump according to claim 1, wherein the feed pump has a cross section smaller than that of 0). 4. A feed pump according to the scope of the patent ml'j, item 1, item 6, in which the additional portion (48, -) is integrally connected to the piston (40). 5 The additional part penetrates the piston (1, 40)...
The feed pump according to claim 1, which is a shaped member (148). 6 The piston (40th or Lth) is in the bath ring (・12
or 142), the first claim
Feed pump as described in section. 7. The piston (140) has two extensions facing each other in the direction of its movement, the extensions being formed by the ends of a tubular member (148) passing through the piston (140); Also tubular member (1'4s)
At least one further second piston (14) arranged coaxially with and at a distance from the piston (140) is fixed to the piston (140). Feed pump as described in section. 8 Each piston (140 or 141) has a guide ring (1
Claim 7, which is surrounded by
Fee 1 mentioned in section? pump. 9 sections (14s) of the tubular member (14s) located between mutually adjacent pistons (140 or 141);
8. Feed pump according to claim 7, wherein the feed pump 9) is surrounded by a guide ring (143). 10 in the direction of movement of the piston (240) and at a distance from it, at least one other piston (
241) are arranged, and both pistons (240
, 241) are connected to each other via a pressure passage (245). 11 Fee 1 according to claim 10, in which each piston (240 or 241) is assigned a pair of coils (220, 221 or 222, 223)? pump. 12 The valley piston (240, 241) is connected to the guide ring (
242) and is still surrounded by pressure passages (242).
11. Feed pump according to claim 10, wherein the feed pump 4'5) is arranged in the intermediate plate (243). 13. The feed pump of claim 6, wherein at least one guide ring is made of ferromagnetic material and the piston is made of a permanent magnet. ]・1 Feed pump according to claim 6, in which at least one guide ring is permanently magnetized in the radial direction and the piston is made of a strong (magnetic) material. 15. The intermediate plate (243) is 13. A feed pump according to claim 12, comprising a magnetic material.