TWI422742B - Hydraulic-electromagnetic motor pump with floating piston - Google Patents

Abstract

A motor pump of the hydraulic-electromagnetic type with floating piston, comprises a container body partly delimited in its external part, by a coil, an inlet duct and an opposite outlet duct located in said body, a couple of opposite magnetic bearings spaced between them and placed between said body and coil, a delivery piston placed inside the body and sliding inside it, said delivery piston being supported by a front and a rear springs and a magnetic bushing placed in the central lower part of the container body facing the inlet duct; the magnetic bushing presents an upper tapered portion facing the delivery piston in operative conditions.

Description

Hydraulic-electromagnetic motor pump with floating piston Field of invention

The present invention relates to a hydraulic-electromagnetic motor pump having a floating piston.

More particularly, the present invention relates to a hydraulic-electromagnetic motor pump having a floating piston that is particularly suitable for fluid operation, particularly water.

This type of motor pump is used in a variety of different devices, such as irons, electric coffee machines, steam generators, flushing systems, and in the automated industry.

Background of the invention

The hydraulic-electromagnetic motor pump (with a floating piston) is known from the patents of EP1205663, US4749343, EP1001167, and EP0288216. In particular, EP 1205663 discloses a hydraulic-electromagnetic motor pump having a floating piston which has the features of the preamble of claim 1 of the patent application.

The operation of the motor pumps relies on the presence of a coil that cooperates with the two magnetic bearings; the coil is electrically energized, and the axial movement of the floating piston or delivery piston is capable of an alternating action. The coil is disposed outside the motor pump body, and the magnetic bearings are placed in a ring seat formed between the coil and a sleeve that houses the piston. The piston is resiliently supported by two opposing helical springs that are alternately compressed during the float to allow liquid to pass from the inlet conduit to the output conduit. Conventional valves, rings and rubber gaskets, etc., coupled to the piston and associated sleeve, will ensure sealing of the fluid moving within the body of the motor pump.

These motor pumps have a major drawback, primarily related to the level of pressure that can be obtained, considering that sometimes high fluid pressurization is necessary for certain specific applications. It is known that a pair of fluid pressurization enhancements can be obtained by increasing the size of the coil to increase its magnetic field strength.

This means that the size of the motor pump will inevitably increase, and the cost thereof will be appreciably added due to the increase of the winding coils. A larger size of the motor pump body as a whole is sometimes not compatible with the mounting of the motor pump on the target device, or it is necessary to at least change the configuration of the devices. This increase in cost is an important factor that may result in the creation of uncompetitive products.

Summary of invention

Accordingly, it is an object of the present invention to obviate the above disadvantages.

More specifically, it is an object of the present invention to provide a hydraulic-electromagnetic motor pump having a floating piston in which the pressure level of the conveying fluid can be increased without increasing its coil to increase its size and production cost.

Another object of the present invention is to provide a motor pump of the above type which is capable of ensuring a high level of durability and reliability, and which is easy to manufacture.

It is noted that one of the objects of the present invention is to provide a motor pump having enhanced magnetic efficiency, or in other words to provide a pump having better performance using a minimum of magnetic material.

Last but not least, the present invention is intended to provide a motor pump that minimizes operational noise.

In accordance with the present invention, this and other objects (e.g., as otherwise set forth in this specification) can be obtained by a motor pump in accordance with the scope of the appended claims.

Simple illustration

The manufacture and operational features of the motor pump of the present invention will be better understood from the following description, which will be referred to by way of example only, which are representative of a non-limiting example; A cross-sectional view of the improved motor pump of the invention in a first operational state (the maximum upper position of the piston); and Fig. 2 is a motor pump of Fig. 1 in another operational state (the minimum and "zero" lower position of the piston) One cross-sectional view; Figure 3 is a cross-sectional view of the motor pump of Figure 1 in another operational state (the smallest and "non-zero" lower position of the piston).

Detailed description of the preferred embodiment

Referring to the above drawings, the motor pump of the present invention is generally indicated as 10 in FIG. 2, and includes: an inlet duct 44'; a reverse outlet duct 36; and a container body 12 which is externally connected by a coil. 14 is partially delimited; two opposite magnetic bearings 46, 46' are spaced apart therebetween and disposed between the body 12 and the coil 14; a delivery piston 16 is disposed within the body 12. It is slidable therein and is supported by a front coil spring 20 and a rear coil spring 20'.

At the front end of the piston 16, at a portion thereof facing the delivery pipe 22, a sealing valve 24 of the delivery piston 16 is generally disposed.

The sealing valve 24 cooperates with a support bearing 28, and a rubber gasket 30 is elastically pressed by the other coil spring 32.

The spring 32 and a portion of the rubber gasket 30 are housed in the conveying pipe The diameter of one of the seats 22 is adapted to accommodate the combination of the rubber gasket 30 and the coil spring 32 and is generally greater than the diameter of the outlet conduit or bore 36 of the delivery conduit 22.

A locking ring 38 has a flanged configuration and is engaged with a mating portion (for example, by a snap fit or the like) which is screwed to the outside of the container body 12 and is disposed on the duct 22 .

The tubular container body 12 includes a front portion having a larger diameter facing the outlet conduit 36; an adjacent intermediate portion having a smaller diameter than the front portion itself, and a sliding axial cavity delimiting the piston 16 The chamber, and a terminal portion 44, having a diameter smaller than the intermediate portion, define the inlet conduit 44'.

The opposite magnetic bearings 46 and 46' may be spaced apart from each other using a spacer member if necessary, and are sleeved on the outer side surface of the intermediate portion of the body 12; the coil 14 is further fitted to the body 12. So that it can contain bearings 46, 46'.

The coil 14 is stabilized by a device, such as a formed elastic ring that mates with one side of the coil and has a shoulder disposed on the body 12 at the front and Having a smaller diameter between the intermediate portions will match the opposite face.

In the central lower portion of the container body 12 facing the inlet duct 44', a magnetic sleeve 52 is preferably made of steel having a low magnetic residual content, which is advantageously provided.

Preferably, the magnetic bushing 52 presents an upper push-out portion 52' that faces the delivery piston 16 in an operational state; at the same time, the delivery piston 16 presents a pushed lower inner portion 16'.

In a particularly efficient embodiment of the invention, the lower inner portion 16' is opposite to the shape of the upper push-out portion 52': this can be seen in Figure 2, which shows the two mutually facing pushes The slope of the extracted portion is equal.

The outer surface of the magnetic sleeve 52 has a differential diameter, and a rear region is defined which faces the tube 44 with a diameter equal to or slightly smaller than the inner diameter of the intermediate portion of the body 12, and a phase The adjacent front region will face the exit aperture or conduit 36 with a smaller diameter.

Referring to the drawings, the rear region and the front region of the magnetic sleeve 52 have different diameters, and one of the rear springs 20' is formed to fit the shoulder, and the lower end of the magnetic sleeve 52 is at the middle portion. The end portion 44 defining the inlet duct 44' is narrowed to match the body 12.

The axial slipback of the piston 16 is obtained by, for example, the pair of coil springs 20 and 20' previously described to cooperate with the piston.

The charging of the coil 14 is obtained, for example, by a pair of connection type electrical connectors.

The purpose of the motor pump of the present invention is to achieve high efficiency due to the presence of the magnetic bushing 52. More specifically, the magnetic bushing 52 is provided with one end aligned with the sliding axis of the piston 16. Close to the piston (and thus a small distance between the piston and one of the two magnetic bearings 46, 46'), so that it can be dynamically placed when the rear spring 20' is loaded The position reached by the piston 16 (usually close to the end portion 44 of the body 12).

The interaction between the sleeve 52 and the two bearings 46, 46' creates a magnetic field that is stronger than using only one of the two bearings 46, 46', so that it is increased to apply to the piston 16 Magnetic attraction, and applied to the current The force of the fluid exiting the delivery conduit 22.

With the bushing 52, it is apparent that the number of windings of the coil 14 can be reduced while maintaining the efficiency level that can only be created by the two bearings 46, 46', with considerable production reduction. .

For the purposes of the present invention, the magnetic sleeve 52 is preferably made of steel having a low magnetic residual content.

According to another advantageous feature of the invention, the motor pump can also include a spacer means operatively acting between the delivery piston 16 and the magnetic sleeve 52, the piston 16 being oscillating during movement of the piston 16 itself. A minimum non-zero distance is maintained between the sleeve 52 and the sleeve 52.

In other words, the foregoing spacer means are present and function to avoid mutual contact of the piston 16 with the sleeve 52 during high frequency oscillations of the piston 16: by avoiding such repeated contact, it will be achievable when the motor pump is operated A full noise suppression.

From a structural point of view, the spacer means can be realized in a number of ways such that they fully satisfy the above technical tasks: for example, the spacer means can comprise the rear spring 20' (the spring constant can be suitably Selected and/or means for applying a predetermined preload to the rear spring 20' itself.

From a geometric point of view, the distance between the piston 16 and the sleeve 52 can be measured at a corresponding coaxial point on the tapered/push-out surface, or it can be located at the piston 16 and the shaft. The two coaxial points on the central portion of the facing surface of the sleeve 52 are measured.

In fact, as can be seen from Figures 2 and 3, even when the push-out portions 16' and 52' are in contact with each other, the piston and the "central portion" of the sleeve Still maintained at a "non-zero" distance.

According to the present invention, the spacer means can be designed to operate without drying the shape of the piston 16 and/or the sleeve 52; more specifically, the spacer means can be stored in a motor pump even if The lower inner portion 16' and/or the upper push-out portion 52' does not exist.

The invention achieves great advantages.

First, due to the presence of the push-out portions, the magnetic coupling of the piston 16 to the sleeve is more enhanced, so that a higher performance level can be easily obtained.

At the same time, the special configuration of the push-out portion allows the movable part of the pump (relative to the "fixed" part) to have a preferred opposing face, thereby reducing mechanical stress and wear.

Moreover, the mutual face-to-face contact of the push-out portions will harmonize the delivery pressure and flow rate each time the piston moves closer to the bushing, causing a greatly reduced "punching effect".

The motor pump manufactured according to the above description does not have the hindrance or added cost caused by the increase in the size of the coil and the associated distribution coil, and the magnetic sleeve 52 can be easily obtained and at a low cost. Installation.

Last but not least, it should be noted that the cooperation between the spacer device and the particular shape of the magnetic bushing and the delivery piston greatly reduces the generation of noise due to the avoidance of such two components of the device. Repeated contact between.

Although the invention has been described with reference to a possible embodiment that is provided as an illustrative and non-limiting example, many variations and modifications in the component arrangement can be accomplished by those skilled in the art in light of the above description.

Therefore, it is to be understood that the present invention is intended to cover all such variations and modifications of the elements in the scope of the invention.

10‧‧‧Motor pump

12‧‧‧ Container body

14‧‧‧ coil

16‧‧‧Transport piston

16’‧‧‧Pushing down the interior

20‧‧‧ front coil spring

20'‧‧‧ rear coil spring

22‧‧‧Transportation pipeline

24‧‧‧ Sealing valve

28‧‧‧Support bearings

30‧‧‧Rubber washers

32‧‧‧ Spring

36‧‧‧Export Pipeline

38‧‧‧Locking ring

44‧‧‧End Department

44’‧‧‧Imported pipeline

46,46’‧‧·magnetic bearings

52‧‧‧Magnetic bushings

52’‧‧‧Upper Pushing Department

1 is a cross-sectional view of a modified motor pump of the present invention in a first operational state (the maximum upper position of the piston); and FIG. 2 is a motor pump of FIG. 1 in another operational state (the piston is the smallest and A cross-sectional view of one of the "zero" lower positions; and FIG. 3 is a cross-sectional view of the motor pump of Fig. 1 in another operational state (the smallest and "non-zero" lower position of the piston).

10‧‧‧Motor pump

12‧‧‧ Container body

14‧‧‧ coil

16‧‧‧Transport piston

16’‧‧‧Pushing down the interior

20‧‧‧ front coil spring

20'‧‧‧ rear coil spring

22‧‧‧Transportation pipeline

24‧‧‧ Sealing valve

28‧‧‧Support bearings

30‧‧‧Rubber washers

32‧‧‧ Spring

36‧‧‧Export Pipeline

38‧‧‧Locking ring

44‧‧‧End Department

44’‧‧‧Imported pipeline

46,46’‧‧·magnetic bearings

52‧‧‧Magnetic bushings

52’‧‧‧Upper Pushing Department

Claims (10)

A hydraulic electromagnetic motor pump having a floating piston, comprising: a container body partially delimited by a coil on an outer portion thereof; an inlet duct and an opposite outlet duct are disposed in the body; two opposite magnetic bearings The two are disposed between the body and the coil; the conveying piston is disposed in the body and slidable therein, and the conveying piston is supported by a front spring and a rear spring; The magnetic sleeve is disposed at a central lower portion of the container body to face the inlet duct; and the magnetic sleeve presents an upper push-out portion that faces the delivery piston when in an operating state. A motor pump according to claim 1, wherein the conveying piston exhibits a pushed lower inner portion, and the lower inner portion preferably has an opposite shape of the upper pushing portion. The motor pump of claim 1 or 2, wherein a lower end of the magnetic sleeve is matched with the container body in an intermediate portion adjacent to a terminal end defining the inlet duct, and the magnetic sleeve is The magnetic bearings interact to increase their magnetic field and thereby increase the magnetic attraction applied to the delivery piston. A motor pump according to claim 1 or 2, wherein the front spring and/or the rear spring are spiral. A motor pump according to claim 1 or 2, wherein the body comprises: a front portion having a larger diameter facing the outlet duct; an adjacent intermediate portion having a diameter smaller than the diameter of the front portion to delimit a sliding chamber of the piston; and a terminal portion having a diameter smaller than the intermediate portion The diameter defines the inlet pipe. The motor pump of claim 1 or 2, wherein the outer surface of the magnetic bearing comprises: a rear region facing the inlet duct, and a diameter of the same or slightly smaller than an inner diameter of the middle portion of the body And an adjacent front region facing the outlet duct having a smaller diameter; the rear region and the front region facing the outlet duct defining a mating shoulder of the rear spring. A motor pump according to claim 1 or 2, wherein the lower end of the magnetic bearing is matched with the container body in the intermediate portion adjacent to the narrowing portion of the end portion defining the inlet duct, and the bearing The distance between the opposite end and the piston is less than the distance between the latter and one or the other of the two magnetic bearings at the position where the piston is reached when the rear spring is loaded. A motor pump according to claim 1 or 2, wherein the magnetic bearing is made of steel having a low magnetic residual content. A motor pump according to claim 1 or 2, further comprising a spacer device operatively acting between the delivery piston and the magnetic sleeve, to maintain the oscillation movement of the piston itself The smallest non-zero distance between the piston and the bushing. A motor pump according to claim 9 wherein the spacer means comprises the rear spring and/or means for imparting a predetermined preload to the rear spring.