DE102017010693A1 - Electromagnetically driven reciprocating pump - Google Patents

Abstract

Task: The maximum operating frequency and life of a reciprocating pump should be increased by improved heat dissipation from the solenoid coil and from the components in contact with the solenoid coil. The magnetic coil is surrounded by a plastic extrusion coating. Solution: On the surface of the plastic extrusion coating (4) at least one heat conducting plate (5) is arranged, which consists of a metal with better thermal conductivity than iron. Application of the reciprocating pump: conveying and / or dosing of liquids , in particular of liquid fuels and reagents in vehicles and moving work machines.

Description

The invention relates to an electromagnetically driven reciprocating pump according to the preamble of the first claim and a method for its production.

State of the art:

Reciprocating pumps with a drive by an electromagnet are known, for example from the document DE 4328621A1 , An important advantage of these reciprocating pumps is that the temporal delivery volume can be adapted to the requirements of the application by changing the operating frequency.

The driving electromagnet has a low efficiency and at higher operating frequencies, the solenoid of the electromagnet heats up significantly, as a result, the operating frequency and the life of the reciprocating pump are limited in some applications by this heating.

Task:

The maximum operating frequency and the life of a reciprocating pump to be increased by an improved heat dissipation from the solenoid and from the contacting with the solenoid components. It should also be described a method for the cost-effective production of a reciprocating pump with improved heat dissipation.

Solution:

The objects directed to the device are achieved by the features of the first claim, advantageous developments are specified in the dependent claims 2 to 11, the independent claim 12 describes a method for producing the device according to the invention.

The reciprocating piston pump according to the invention comprises at least one magnetic coil, a magnetic pole, a magnetic yoke, an iron yoke and a plastic extrusion. In addition, it contains a magnet armature and a pumping apparatus, which is connected to the anchor.

At least one Wärmeleitblech is arranged on the surface of the plastic extrusion, which consists of a metal with a higher thermal conductivity than iron.

Preferably, the at least one heat conducting plate is in heat-conducting connection with at least one fastening device and / or a component carrying the reciprocating pump of another device, for example a vehicle component.

For the heat conducting sheet are suitable as materials, in particular aluminum, copper and copper alloys because of their good thermal conductivity.

Preferably, the at least one heat conduction plate is arranged on such a part of the surface of the plastic extrusion, below which the thickness of the plastic extrusion over the magnet coil is the smallest, so that the heat transfer through the plastic is only slightly hindered. In this case, the thickness of the plastic extrusion coating can also be zero in a partial region of the surface of the heat conducting sheet.

In a first advantageous embodiment, the iron return means is at least partially formed by a plurality of iron particles, which are mixed with the plastic of the plastic extrusion. The size and the number of iron particles are determined by the process of mixing with the plastic and by the conditions of the magnetic flux line.

In a second embodiment, the iron return means is formed as an iron bracket and at least one Wärmeleitblech is arranged so that it touches at least a portion of the bracket or has a particularly small distance from the relevant part of the bracket, wherein the space between the bracket and the Wärmeleitblech with Material of the plastic extrusion is filled.

As a particularly low is preferably to consider a distance which is smaller than ten times the thickness of the Wärmeleitblechs, more preferably smaller than three times the thickness of the Wärmeleitblechs, even more preferably smaller than the thickness of the Wärmeleitblechs.

Air-filled cavities are disadvantageous in this zone of heat transfer, the plastic material conducts the heat better than air.

Another improvement of the heat transfer is achieved if the at least one heat conduction plate is arranged so that it touches a part of the magnetic pole or has a particularly small distance to the magnetic pole, wherein again the space associated with the distance is filled with material of the plastic extrusion.

Again, preferably a distance is to be regarded as particularly low, which is smaller than ten times the thickness of the Wärmeleitblechs, on preferably smaller than three times the thickness of the heat conducting sheet, still more preferably smaller than the thickness of the heat conducting sheet.

A similar improvement of the heat transfer is achieved if the at least one heat conduction plate arranged so that it touches a part of the magnetic yoke or has a particularly small distance from the magnetic yoke, wherein again the distance is filled with material of the plastic encapsulation.

Again, preferably a distance is to be regarded as particularly low, which is smaller than ten times the thickness of the Wärmeleitblechs, more preferably smaller than three times the thickness of the Wärmeleitblechs, even more preferably smaller than the thickness of the Wärmeleitblechs.

When the at least one heat conducting plate contacts the magnetic pole and the magnetic yoke, it can also be used to increase the magnetic flux of the magnetic coil, thereby improving or even replacing the effect of the iron yoke. For this purpose, the material of the Wärmeleitblechs must have both good heat conduction properties, nämliche better than iron, as well as suitable for its good magnetic conductivity for the passage of the magnetic flux, the magnetic conductivity should be considerably higher than that of copper.

Such a combination of properties, for example, have some copper alloys with a given not insignificant nickel and / or iron content, or copper alloys with aluminum and iron content. Not insignificant are alloy contents of more than 5%.

Advantageously, at least one heat-conducting on the side remote from the reciprocating pump side grooves, nubs or depressions. Such mold elements have characteristic dimensions that are greater than one-tenth of the thickness of the Wärmeleitblechs. The mold elements increase the effective surface for the dissipation of heat.

Also advantageously, at least one heat-conducting on the side facing the reciprocating pump side grooves, nubs or depressions. These form elements have characteristic dimensions which are greater than one-tenth of the thickness of the Wärmeleitblechs. These form elements increase the effective surface area for the heat transfer to the heat conduction plate and improve the mechanical connection of the Wärmeleitblechs for Kunststoffumspritzung.

Also advantageously, at least one heat conduction sheet is perforated to anchor it better in the plastic extrusion. In this case, the hole diameter is greater than the thickness of the Wärmeleitblechs and smaller than half the length of the Wärmeleitblechs.

To produce the reciprocating pump according to the invention, at least one heat-conducting sheet is inserted as an insert into the injection mold during production of the plastic extrusion coating and fixedly connected to the reciprocating pump by injection-molding.

Application:

Reciprocating pump of the type described are used for conveying and / or dosing of liquids, in particular of liquid fuels and reagents in vehicles and moving machines.

Further details, features and advantages of the invention will become apparent from the following description with reference to FIGS.

• 1: Schnittdarstellung der ersten Ausführung
• 2: Seitenansicht der ersten Ausführung
• 3: Schnittdarstellung der zweiten Ausführung (Schnitt A-A)
• 4: Seitenansicht der zweiten Ausführung mit Angabe der Schnittebene
• 5: Schnittdarstellung der dritten Ausführung

Pictures and exemplary versions:

• 1 : Sectional view of the first embodiment
• 2 : Side view of the first version
• 3 : Sectional view of the second embodiment (section AA)
• 4 : Side view of the second version with details of the cutting plane
• 5 : Sectional view of the third embodiment

1 shows a sectional view of a reciprocating pump ( 1 ), which has a magnetic coil ( 2 ) and a plastic extrusion ( 4 ) having. Other components of the reciprocating pump, such as the pumping apparatus, are not shown.

On the surface of the plastic coating ( 4 ) are two Wärmeleitbleche ( 5 ), which consist of a metal with better thermal conductivity than iron. The required iron backbone ( 3 ) is executed in this embodiment by a plurality of iron particles, which with the plastic of the plastic extrusion ( 4 ) are mixed.

2 shows a side view of the same embodiment. In this first embodiment, the heat conducting plates ( 5 ) the magnetic pole ( 11 ) and the magnetic yoke ( 12 ).

3 shows a sectional view (A - A) of the reciprocating pump ( 1 ).

In this second embodiment, the heat conducting plates ( 5 . 5 ' ) also a bracket ( 13 ) out Iron containing the iron backbone ( 3 ) and in the plastic extrusion ( 4 ) is embedded.

4 shows a side view of the same second embodiment, in which the heat conducting ( 5 . 5 ' ) in heat-conducting connection with a fastening device ( 6 ) and another, the reciprocating pump ( 1 ) supporting component ( 7 ) stand.

5 shows a sectional view of a third embodiment of the reciprocating pump ( 1 ), in which the Wärmeleitbleche ( 5 ) on a part of the surface of the plastic extrusion ( 4 ) are arranged below which the thickness of the plastic extrusion ( 4 ) above the magnetic coil ( 2 ) is the smallest. In this embodiment, the iron trapping agent ( 3 ) by a plurality of iron particles, which with the plastic of the plastic extrusion ( 4 ) are mixed.

LIST OF REFERENCE NUMBERS

1.

reciprocating pump

Second

solenoid

Third

Iron yoke

4th

plastic extrusion

5th

heat conducting

6th

fastening device

7th

Carrying component

11th

magnetic pole

12th

yoke

13th

hanger

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4328621 A1 [0002]

Claims (12)

Reciprocating pump (1), at least comprising a magnetic coil (2), a magnetic pole (11), a magnetic yoke (12), an iron return means (3) and a plastic extrusion (4), characterized in that on and / or on the surface of the plastic extrusion (4) at least one Wärmeleitblech (5) is arranged, which consists of a metal having a higher thermal conductivity than iron. Reciprocating pump (1) after Claim 1 , characterized in that the at least one heat-conducting sheet (5) is in heat-conducting connection with at least one fastening device (6) and / or a component (7) of another device carrying the reciprocating pump (1). Reciprocating pump (1) after Claim 1 or 2 , characterized in that the at least one heat conducting sheet (5) is arranged on at least a portion of the surface of the plastic extrusion (4), below which the thickness of the plastic extrusion coating (4) over the magnetic coil (2) is smallest. Piston pump (1) according to one of the preceding claims, characterized in that the iron return means (3) has a plurality of iron particles which are mixed with the plastic of the plastic extrusion. Reciprocating pump (1) according to one of Claims 1 to 3 , characterized in that the iron return means (3) is formed as an iron bracket (13) and that at least one Wärmeleitblech (5) is arranged so that it touches at least a portion of the bracket (15) or a particularly small distance from the relevant part of the iron yoke, wherein the intermediate space is filled with material of the plastic encapsulation (4), and wherein a distance which is smaller than ten times the thickness of the Wärmeleitblechs, more preferably less than three times the thickness of the Wärmeleitblechs, even further applies as a particularly small distance preferably smaller than the thickness of the Wärmeleitblechs. Piston pump (1) according to one of the preceding claims, characterized in that at least one heat conducting plate (5) is arranged so that it touches a part of the magnetic pole (11) or has a particularly small distance from the magnetic pole (11), wherein the intermediate space filled with material of the plastic extrusion (4) and wherein a particularly small distance is preferably a distance which is less than ten times the thickness of the Wärmeleitblechs, more preferably less than three times the thickness of the Wärmeleitblechs, even more preferably smaller than the thickness of the Wärmeleitblechs. Piston pump (1) according to one of the preceding claims, characterized in that at least one heat conducting plate (5) is arranged so that it touches a part of the magnetic yoke (11) or has a particularly small distance from the magnetic yoke (11), wherein the distance with material of the plastic extrusion (4) is filled, and wherein a particularly small distance is preferably a distance which is smaller than ten times the thickness of the Wärmeleitblechs, more preferably smaller than three times the thickness of the Wärmeleitblechs, even more preferably smaller than the thickness of the Wärmeleitblechs , Reciprocating pump (1) after the Claims 5 and 6 , characterized in that the at least one Wärmeleitblech (5) is suitable because of its magnetic conductivity to increase the magnetic flux of the magnetic coil (2), wherein the magnetic conductivity is higher than that of copper. Reciprocating pump (1) according to one of the preceding claims, characterized in that at least one heat conducting plate (5) on the side facing away from the reciprocating pump (1) side grooves, and / or knobs and / or recesses. Reciprocating pump (1) according to one of the preceding claims, characterized in that at least one heat conducting plate (5) has grooves, and / or dimples and / or recesses on the side facing the reciprocating pump (1). Piston pump (1) according to one of the preceding claims, characterized in that at least one heat conducting plate (5) is perforated. Method for producing a reciprocating pump (1), which comprises at least one magnetic coil (2), a magnetic pole (11), a magnetic yoke (12), an iron return means (3) and a plastic encapsulation (4), characterized in that in the manufacture of Kunststoffumspritzung (4) at least one Wärmeleitblech (5) is inserted as an insert in the mold and is firmly connected by the encapsulation with the reciprocating pump.

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