CN112392704A - Micro fluid pump and pressure fluid application equipment - Google Patents

Abstract

Disclosed are a micro fluid pump and a pressure fluid application apparatus, the micro fluid pump including: a motor; a main housing; a diaphragm body mounting base on which a diaphragm body having a plurality of diaphragm units is provided; a rotary wheel which receives the torque transferred by the motor to rotate and is provided with an eccentric pendulum shaft; and a curved rod, a first end of which is connected to the pendulum shaft, and a second end opposite to the first end is connected to the diaphragm body to drive the diaphragm units to perform reciprocating compression and suction motions, wherein the diaphragm units respectively comprise a bag cavity and a rod part positioned at the bottom of the bag cavity, the rod part comprises an expanded part, the expanded part and the rod part form a first shoulder, the curved rod comprises a plurality of mounting holes for mounting the rod parts of the plurality of diaphragm units, the mounting holes comprise a first section and a second section with a diameter larger than that of the first section, the first section and the second section form a second shoulder, the expanded part penetrates through the first section, and the second shoulder abuts against the first shoulder.

Description

Micro fluid pump and pressure fluid application equipment

Technical Field

The present disclosure relates to the field of fluid pumps, and more particularly to a micro fluid pump and a pressurized fluid application apparatus.

Background

With the widespread use of fluid pumps in both residential and commercial applications, increased demands have been placed on fluid pumps, particularly micro-fluid pumps.

Current micro fluid pumps, such as micro water pumps, typically comprise a motor, a transmission assembly, a wheel (eccentric), a curved lever, a main housing, a water bladder mount, a valve seat, and a water bladder body having a plurality of water bladder units, wherein the wheel is connected to the motor, the curved lever is connected to the wheel, and the water bladder body is sealingly pressed against the water bladder mount through the valve seat and is connected to the curved lever. In the operating state, the rotating wheel can rotate under the driving of the motor, the rotating wheel rotates to enable the swing shaft arranged on the rotating wheel to swing, and the swing shaft swings to drive the water sac unit on the water sac mounting seat to perform reciprocating compression and suction motions through the bent rod, so that fluid with preset pressure is output.

Generally, the rod part of each water bag unit of the water bag body passes through the corresponding mounting hole on the curved rod, so that the curved rod can continuously and stably drive the water bag body to move. The stem portion of the water bladder unit is long for easy installation. Therefore, some known fluid pumps require a large installation space or require trimming of the shaft after the water bladder is installed on the curved rod. While other known fluid pumps reduce the volume of the fluid pump by compressing the size of the curved rod in a manner that reduces the strength of the curved rod, which in turn affects the stability of the fluid output from the fluid pump and even causes a reduction in the pressure of the fluid.

Disclosure of Invention

In view of the above problems, the present disclosure provides a micro fluid pump and a pressure fluid application apparatus. The micro fluid pump and the pressure fluid application equipment provided by the disclosure can ensure that the fluid pump continuously and stably outputs high-pressure fluid, reduce the volume of the fluid pump and reduce the installation cost of the fluid pump.

According to an aspect of the present disclosure, there is provided a micro fluid pump including: a motor having a motor shaft extending along an axis; a main housing connected to the motor and defining an accommodating space; a diaphragm body mount coupled to the main housing, the diaphragm body mount having a diaphragm body with a plurality of diaphragm units disposed thereon; a rotary wheel which receives the torque transferred by the motor to rotate and is provided with an eccentric pendulum shaft; and a crank shaft having a first end connected to the pendulum shaft and a second end opposite to the first end connected to the diaphragm body to drive the diaphragm units to perform reciprocating compression and suction motions, wherein the diaphragm units each include a capsule cavity and a stem portion at a bottom of the capsule cavity, the stem portion including an enlarged portion forming a first shoulder with the stem portion, wherein the crank shaft includes a plurality of mounting holes for mounting the stem portions of the plurality of diaphragm units, wherein the mounting holes include a first section and a second section having a diameter larger than that of the first section, the first section and the second section forming a second shoulder, and wherein the enlarged portion passes through the first section and the second shoulder abuts against the first shoulder.

The microfluidic pump according to the present disclosure may further include one or more of the following features, alone or in combination.

In some embodiments, the length of the second section along the axis is at least 2 mm.

In some embodiments, the shaft further includes an extension extending from the enlarged portion away from the bladder cavity, and the extension has a diameter that is smaller than a diameter of the first section of the mounting aperture.

In some embodiments, the micro fluid pump further comprises a support member fixed to the main housing and axially supporting the curved rod.

In some embodiments, the support is a support rod, a ball is disposed between the support and the curved rod, and a spherical recess is disposed on the support for receiving the ball.

In some embodiments, the knee lever further comprises an insert supported on the ball.

According to another aspect of the present disclosure, a pressurized fluid application apparatus is provided, comprising a micro fluid pump as described above.

The pressure fluid application apparatus according to the present disclosure may further comprise one or more of the following features, alone or in combination.

In some embodiments, the device is a coffee maker.

In some embodiments, the coffee maker is an espresso maker.

In some embodiments, the device is a dental prophylaxis device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without making creative efforts. The following drawings are not intended to be drawn to scale in actual dimensions, with emphasis instead being placed upon illustrating the principles of the disclosure.

FIG. 1 illustrates an exploded view of a micro fluid pump according to an embodiment of the present disclosure;

FIG. 2 illustrates a perspective view of a micro fluid pump according to an embodiment of the present disclosure;

FIG. 3 illustrates a cross-sectional view of a micro fluid pump according to an embodiment of the present disclosure;

FIG. 4 illustrates a partial cross-sectional view of a micro fluid pump showing a cross-section of a curved rod and a diaphragm body coupled to the curved rod in accordance with an embodiment of the present disclosure;

FIG. 5 illustrates a partial schematic view of a diaphragm body of a micro fluid pump according to an embodiment of the present disclosure;

FIG. 6 illustrates a bottom oblique view of a curved rod of a micro fluid pump according to an embodiment of the present disclosure;

FIG. 7 shows a schematic perspective view of a curved rod and support of a micro fluid pump according to an embodiment of the present disclosure; and

FIG. 8 shows a schematic exploded view of a curved bar, support and insert of a micro fluid pump according to an embodiment of the present disclosure.

Detailed Description

Technical solutions in embodiments of the present disclosure will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only some embodiments, but not all embodiments, of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

Current micro fluid pumps, such as micro water pumps, typically include a motor, a drive assembly, a wheel (i.e., an eccentric), a curved lever, a main housing, a bladder mount, a valve seat, and a bladder body having a plurality of bladder units, wherein the drive assembly is connected to the motor, the wheel is connected to the drive assembly, the curved lever is connected to the wheel, and the bladder body is sealingly pressed against the bladder mount through the valve seat and is connected to the curved lever. In the operating state, the rotating wheel can rotate under the driving of the motor, the rotating wheel rotates to enable the swing shaft arranged on the rotating wheel to swing, and the swing shaft swings to drive the water sac unit on the water sac mounting seat to perform reciprocating compression and suction motions through the bent rod, so that fluid with preset pressure is output.

Generally, the rod part of each water bag unit of the water bag body passes through the corresponding mounting hole on the curved rod, so that the curved rod can continuously and stably drive the water bag body to move. The stem portion of the water bladder unit is long for easy installation. Such a longer stem portion increases the volume of the fluid pump. Alternatively, an additional trimming process is required to trim off the excess stem portion when installing the fluid pump, and thus the installation process is time consuming and labor intensive.

In view of the above, the present disclosure provides a micro fluid pump and a pressure fluid application apparatus, which can ensure that a fluid pump continuously and stably outputs a high-pressure fluid, reduce the volume of the fluid pump, and reduce the installation cost of the fluid pump.

According to an aspect of the present disclosure, a micro fluid pump is presented. Fig. 1 shows an exploded view of a micro fluid pump 100 according to an embodiment of the present disclosure. Fig. 2 illustrates a perspective view of a micro fluid pump 100 according to an embodiment of the present disclosure. FIG. 3 illustrates a cross-sectional view of the micro fluid pump 100 illustrated in FIG. 2, in accordance with an embodiment of the present disclosure. It should be understood that fig. 1-3 only schematically illustrate the microfluidic pump of the present disclosure, and the attitude shown in these figures does not imply a state in which it is installed in a pressure fluid application device.

Referring to fig. 1, the micro fluid pump 100 includes, for example, a motor 110, a main housing 120, a diaphragm body mount 130, a valve seat 140, a runner 170, and a curved rod 180. It should be understood that, according to actual needs, the micro fluid pump 100 may further include, for example, an upper cover 150 or other components, such as the upper cover 150, the valve seat 140, the diaphragm body mounting seat 130, the main housing 120, and the motor 110, which are hermetically mounted in sequence from top to bottom, as shown in fig. 1 and 3. The micro fluid pump 100 may further include a transmission assembly 190, for example, formed of a plurality of gears, to transmit the torque from the motor 110 to the runner 170, as desired.

As shown in fig. 1, the motor 110 has a motor shaft 111 extending along an axis X, which is a rotation axis of the motor and extends, for example, in a vertical direction in fig. 1. Embodiments of the present disclosure are not limited by the rotational speed of the motor and its motor type.

The main housing 120 is connected to the motor 110, for example, at one end thereof, to be assembled therewith. The main housing 120 is mounted on the motor 110 by screws, for example. The main housing 120 defines an accommodating space, which is a space for accommodating internal components of the main housing (e.g., a crank, a wheel, a transmission assembly, etc.). The embodiment of the disclosure is not limited by the connection mode of the main shell and the motor, the specific structure of the accommodating space and the position of the accommodating space.

Referring to fig. 2 and 3, the diaphragm body mount 130 is coupled to the main housing 120. The diaphragm body mount 130 is coupled to the main housing 120, for example, via a snap fit, or it may be otherwise coupled to the main housing. Embodiments of the present disclosure are not limited by the manner in which diaphragm body mount 130 is coupled to main housing 120.

With continued reference to FIG. 1, the diaphragm body mount 130 is provided with a diaphragm body 160 having a plurality of diaphragm elements 161. The diaphragm body mount 130 is provided with openings corresponding to the number of diaphragm units 161 for a portion of each diaphragm unit (e.g., the stem portion 1612 of the diaphragm unit shown in fig. 5) to pass through the corresponding opening to connect with the curved rod 180. For example, the diaphragm body 160 may be a plurality of integrally formed water bladders, wherein each water bladder is a diaphragm unit.

Referring again to FIG. 2 and FIG. 3, the valve seat 140 is sealingly coupled to the diaphragm body mount 130, and a diaphragm body 160 having a plurality of diaphragm cells 161 is at least partially sandwiched between the diaphragm body mount 130 and the valve seat 140. The valve seat 140 may be coupled to the diaphragm body mount 130 via, for example, a snap fit, or may be otherwise coupled to the diaphragm body mount. The sealed mounting of the diaphragm body 160 is achieved by the mating of the diaphragm body mount 130 with the valve seat 140. For example, the diaphragm body mount 130 and the valve seat 140 sandwich the planar portion of each diaphragm unit to achieve a sealed mounting. For example, the opening of the diaphragm body mount 130 supports a portion of the bladder cavity of the diaphragm unit that is the portion of the diaphragm unit that primarily undergoes compression and suction motions, such as the upwardly open bladder cavity 1611 in FIG. 5.

Referring to fig. 1, the wheel 170 may be connected to the motor 110 through a transmission assembly 190 to receive torque transferred from the motor 110 to rotate and has an eccentric balance shaft 171 disposed thereon. For example, the rotating wheel 170 is an eccentric wheel and is provided with an eccentric hole thereon, and the swing shaft 171 is inserted into the eccentric hole of the eccentric wheel such that the swing shaft 171 is disposed at an angle to the output shaft of the motor 110. For example, the transmission assembly 190 includes four gears that mesh with each other. However, embodiments of the present disclosure are not limited by the number of gears, nor by the number of shafts on which the gears are disposed.

Referring to fig. 3, a first end 181 of a knee lever 180 is coupled to the pendulum shaft 171, and a second end 182 opposite the first end 181 is coupled to the diaphragm body 160 to drive the reciprocating compression and pumping motion of the diaphragm unit. The curved lever 180 can perform a repetitive pressing swing motion based on the rotation of the wheel 170.

The reciprocating compression and suction motion is that the diaphragm units of the diaphragm body are alternately in a compression state and a tension state. For example, if the diaphragm body is a water bag body comprising a plurality of water bag units, when the curved rod moves downwards under the action of the rotating wheel and pulls down the water bag units, the water bag units are in the process of pumping movement, the air pressure in the water bag units is reduced, and fluid enters the water bag units; on the contrary, when the curved lever moves upward under the action of the runner and presses the water bladder unit, the water bladder unit is in a compression motion process, and the air pressure in the water bladder unit rises, thereby outputting fluid with high pressure.

The bell crank and diaphragm body of embodiments of the present disclosure are described in detail below in conjunction with fig. 4-8. Fig. 4 shows a sectional view of the knee lever and the diaphragm body, fig. 5 shows a partial schematic view of the diaphragm body, fig. 6 shows a bottom oblique view of the knee lever, fig. 7 shows a perspective view of the knee lever and the support, and fig. 8 shows an exploded schematic view of the knee lever, the support and the insert.

As shown in fig. 4 and 5, each diaphragm unit 161 includes a bladder cavity 1611 and a stem 1612 at the bottom of the bladder cavity 1611. For example, the diaphragm unit 161 may be made of an elastic material, such as rubber, or it may be made of other materials. Embodiments of the present disclosure are not limited by the specific materials of construction of the capsule cavity.

As shown in fig. 4 and 5, in order to enable connection with the curved lever 180 and to enable reciprocating compression and suction movements under the driving of the curved lever 180, the rod portion 1612 of the diaphragm unit 161 includes an enlarged portion 1613, and the enlarged portion 1613 and the rod portion 1612 form a first shoulder 1614. For example, the stem is cylindrical, but the present disclosure is not limited to a particular form of the stem.

As shown in fig. 6 and 7, at the second end 182 of the bell crank, the bell crank 180 includes a plurality of mounting holes 183 for mounting the stem portions 1612 of the plurality of diaphragm units 161. The number of the mounting holes 183 corresponds to the number of the diaphragm units 161.

As shown again in fig. 4, each mounting hole 183 includes a first segment 1831 and a second segment 1832. For example, the first and second segments 1831, 1832 have a cylindrical shape. For example, the diameter of the second segment 1832 is greater than the diameter of the first segment 1831, and the first segment 1831 and the second segment 1832 form a second shoulder 1833. Further, the diameter of the enlarged portion 1613 of the diaphragm unit 161 is larger than the diameter of the first section 1831, for example.

When the diaphragm body is mounted to the curved rod, the enlargement 1613 passes through the first section 1831, and the second shoulder 1833 formed by the first section 1831 and the second section 1832 abuts the first shoulder 1614 formed by the enlargement 1613 and the rod portion 1612. In this manner, the second shoulder 1833 blocks the enlarged portion 1613 from moving upward, i.e., blocks the diaphragm unit from moving away from the first end 181 of the curved rod 180. Therefore, the diaphragm unit can be stably mounted on the curved rod without being separated from the curved rod during the reciprocating compression and suction motions, thereby avoiding the occurrence of a situation in which the pressure in the capsule cavity is reduced to cause a drop in the fluid pressure, and enabling the pressure of the output fluid to be increased.

In some embodiments, first shoulder 1614 and second shoulder 1833 may have mating shapes. However, embodiments of the present disclosure are not limited in this regard.

To ensure the mechanical strength of the knee lever, the length of the second section 1832 along the motor axis X is at least 2 mm.

In addition, to facilitate installation, as shown in figures 4 and 5, the shaft 1612 of the diaphragm unit 161 also includes an extension 1615, the extension 1615 extending from the enlarged portion 1613 away from the balloon cavity 1611. For example, the diameter of the approximately cylindrical extension 1615 is less than the diameter of the first section 1831 of the mounting hole 183. In this way, it becomes easier to pass the enlarged portion through the mounting hole by applying a tensile force to the extended portion that clamps the diaphragm unit, for example.

As shown in fig. 1, 4, 7 and 8, the micro fluid pump 100 further includes a support member 210 for supporting the curved rod 180 axially (i.e., in the direction of the motor axis X), which may also be at least partially disposed in the accommodating space of the main housing 120, and which may be fixed to the main housing 120 in order to provide axial support to the curved rod 180 and effectively transmit axial pressure to which the curved rod 180 is subjected to the main housing 120. The support may be made of metal, such as steel.

In one embodiment, as shown in fig. 7, the support 210 is a support rod having a substantially flat rod-like shape. It will be appreciated that the support bar may have other forms, for example, an X-shaped, cruciform shaped bracket.

For example, as shown in fig. 8, the support member 210 in the form of a support rod may have positioning recesses in the form of through holes 2102 and 2103 at portions near both ends, and the main housing 120 may have positioning protrusions (not shown in the drawings) at its wall portion to be fitted with the through holes.

Referring to fig. 8, the knee lever 180 comprises a hollow 185, so that the support 210 can be arranged in the hollow 185 on a plane transverse to the axis X. For example, the hollow portion 185 is perforated so that the support member 210 can pass therethrough and both ends thereof are fixed to the main casing 1. The expression "direction transverse to the axis X" is understood here to mean that this direction intersects the axis X.

Referring again to fig. 4 and 8, the micro fluid pump 100 further includes a ball 220 disposed between the support 210 and the curved rod 180, such as on a spherical recess 2101 on the support 210 for receiving the same. After the mounting is completed, the knee lever 180 is supported on the sphere 220, i.e. the portion of the knee lever 180 above the hollow 185 is supported on the apex of the sphere 220. The outer face of the sphere for support may interfit with the inner edge of the spherical recess 2101 so that the sphere is a tight fit (which may be a loose fit in other cases) to the support bar. When the curved bar 180 moves by the swing shaft 171, the ball 220 supporting the curved bar 180 does not move with the curved bar 180 due to the tight fit with the support bar, but is fixed relative to the support bar. It should be understood that other convex shaped members besides a sphere may be used in the present disclosure to support the curved bar.

The ball 220 may have a variety of material choices, for example, it may be made of steel, ceramic, cemented carbide, and the like. Therefore, the ball can provide strong support for the curved rod and bear high working pressure.

Further, in some embodiments, the knee lever 180 also includes an insert 184, the insert 184 being supported on the sphere 220 after installation is complete. The insert 184 is provided with a knee recess 186, as shown in fig. 4, which cooperates with the ball 220 to enable the knee 180 to be stably supported on the ball 220. Specifically, in the example shown in fig. 8, the insert 184 may have a middle section 1841, and branch sections 1842 and 1843 extending from both ends of the middle section 1841. The intermediate section 1841 may have an elongated shape, in which a portion expanding in a direction transverse to its elongation may be provided, so that both sufficient space is provided for providing a knee recess cooperating with the ball 220 and sufficient structural strength of the insert is ensured. A knee lever recess 186 may be provided in a lower face of the flared portion, i.e. the face facing the second end 182 of the knee lever 180. The branch sections 1842 and 1843 may extend parallel to each other toward the second end 182 of the curved rod 180. The insert 184 may be made of a metallic material, such as steel, thereby forming a rigid support with the ball 220.

In a preferred example, the insert 184 is embedded in the body of the knee lever 180 by overmolding. The insert 184 thus constitutes a reinforcement of the knee lever 180 itself, thereby also increasing the overall structural strength of the knee lever 180.

With the above arrangement, a substantial part of the high pressure generated in the reciprocating suction and compression movements of the diaphragm units of the diaphragm body will be transmitted to the main housing via the axial support member in the direction of the axis X, and not to the crank, the runner, the transmission assembly, etc. As a result, the pressure of the discharge fluid of the fluid pump is significantly increased (e.g., 10 bar pressure), extending the useful life of the components in the fluid pump. The fluid pump of the present disclosure can continuously and stably output high-pressure fluid at, for example, 10 bar pressure even in the case where the size of the main body of the knee lever in the direction of the axis X is small. In addition, due to the use of the axial support piece, the ball body and the insert, the size of the curved rod along the direction of the axis X can be increased, so that the rod part of the diaphragm unit does not need to be cut off through a trimming program during installation, and the installation cost of the fluid pump can be reduced.

In some embodiments, the plurality of membrane units 161 is three membrane units. By arranging the three diaphragm units, the high-pressure fluid output of the micro fluid pump can be better realized, and the performance of the micro fluid pump is improved.

In some embodiments, referring to fig. 1, the plurality of membrane units 161 is four membrane units. The four diaphragm units are arranged, so that high-pressure fluid output of the micro fluid pump can be better realized, and the performance of the micro fluid pump is improved.

According to another aspect of the present disclosure, a pressure fluid application apparatus is provided that includes a micro fluid pump as described above and is capable of having the functions and advantages as described above.

In some embodiments, the device is a coffee maker. The coffee machine may be, for example, an espresso machine, or it may also be an american coffee machine, or it may also be another type of coffee machine. Embodiments of the present disclosure are not limited by the particular type of coffee maker.

In some embodiments, the coffee maker is an espresso maker. By using the micro fluid pump, the coffee machine can stably and continuously output fluid with the pressure of about 10 bar, so that pure espresso coffee can be brewed, and the espresso coffee machine has good performance.

In some embodiments, the device is a dental prophylaxis device. The fluid pressure applying device may be, for example, a household dental prophylaxis device, or it may also be a medical dental prophylaxis device. Embodiments of the present disclosure are not limited by the field of application of the dental rinser.

This application uses specific words to describe embodiments of the application. Reference to "a first/second embodiment," "an embodiment," and/or "some embodiments" means a feature, structure, or characteristic described in connection with at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The foregoing is illustrative of the present disclosure and is not to be construed as limiting thereof. Although a few exemplary embodiments of this disclosure have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this disclosure. Accordingly, all such modifications are intended to be included within the scope of this disclosure as defined in the claims. It is to be understood that the foregoing is illustrative of the present disclosure and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims (10)

1. A micro fluid pump comprising:

a motor having a motor shaft extending along an axis;

a main housing connected to the motor and defining an accommodating space;

a diaphragm body mount coupled to the main housing, the diaphragm body mount having a diaphragm body with a plurality of diaphragm units disposed thereon;

a rotary wheel which receives the torque transferred by the motor to rotate and is provided with an eccentric pendulum shaft; and

a crank lever having a first end coupled to the balance staff and a second end opposite to the first end coupled to the diaphragm body to drive the reciprocating compressing and sucking motion of the diaphragm unit,

wherein the diaphragm units each comprise a capsule cavity and a stem at the bottom of the capsule cavity, the stem comprising a bulge forming a first shoulder with the stem,

wherein the curved bar includes a plurality of mounting holes for mounting the stem portions of the plurality of diaphragm units,

wherein the mounting hole comprises a first section and a second section having a diameter greater than a diameter of the first section, the first section and the second section forming a second shoulder, an

Wherein the enlarged portion passes through the first section and the second shoulder abuts the first shoulder.

2. The micro fluid pump of claim 1, wherein the length of the second section along the axis is at least 2 mm.

3. The micro-fluid pump of claim 2, wherein the stem further comprises an extension extending away from the capsule cavity from the enlarged portion, and the extension has a diameter that is smaller than a diameter of the first section of the mounting hole.

4. The micro fluid pump as claimed in claim 1, further comprising a support member fixed to the main housing and axially supporting the curved rod.

5. The micro fluid pump as claimed in claim 4, wherein the support is a support rod, a ball is disposed between the support and the curved rod, and a spherical recess is disposed on the support for receiving the ball.

6. The micro fluid pump of claim 5, wherein the curved rod further comprises an insert, the insert being supported on the ball.

7. A pressure fluid application apparatus comprising a micro fluid pump as claimed in any one of claims 1 to 6.

8. The device of claim 7, wherein the device is a coffee maker.

9. The apparatus of claim 8, wherein the coffee maker is an espresso maker.

10. The apparatus of claim 7, wherein the apparatus is a dental prophylaxis device.

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