CN213981126U - Micro fluid pump and pressure fluid application equipment - Google Patents

Abstract

The utility model relates to a miniature fluid pump, include: a motor having a motor shaft extending along an axis; a main housing connected to the motor and defining an accommodating space; a rotary wheel which receives the torque transmitted by the motor to rotate and is provided with an eccentric pendulum shaft; 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 crank lever 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 reciprocating compression and suction motion of the diaphragm unit; wherein the fluid pump further comprises an axial support assembly fixed at least with respect to the main housing and supporting the curved rod in the direction of the axis, the axial support assembly comprising a support rod and a support ball projecting from the support rod towards the diaphragm body mount, and wherein the support ball and the support rod are configured to form a subassembly connected to each other. The utility model discloses still relate to the pressure fluid application equipment including this kind of miniature fluid pump.

Description

Micro fluid pump and pressure fluid application equipment

Technical Field

The utility model relates to a fluid pump field more specifically designs a miniature fluid pump and includes this kind of miniature fluid pump's pressure fluid application equipment promptly.

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 (e.g. micro water pumps) typically comprise a motor and a main housing connected to the motor, in which a fluid pump may also be provided: an eccentric wheel which receives the torque transmitted from the motor to rotate and is fixedly connected with an eccentric shaft; a water bladder mounting seat on which a water bladder body having a plurality of water bladder units is mounted; and a curved rod having one end connected to the eccentric shaft and the other end connected to the water bladder mounting seat, so that the curved rod can drive the water bladder body and the water bladder unit thereof on the water bladder mounting seat to perform reciprocating compressing and sucking motions to output fluid with a predetermined pressure. However, in such micro-fluid pumps, the curved rod is subjected to a large axial pressure, for example from the water bladder, which on the one hand affects the curved rod and thus the stable operation of the water bladder mounting seat and the water bladder, and on the other hand may compromise the mechanical strength of the curved rod, causing premature wear of the curved rod and thus a negative impact on the performance of the micro-fluid pump.

Therefore, there is a need for a micro fluid pump capable of outputting high pressure fluid with stable, reliable and efficient operation, wherein the axial pressure to which the bent rod is subjected, which may be detrimental to its service life and operational stability, can be effectively shared by the intermediate assembly, thereby relieving the bent rod of axial load, ensuring that it is not prematurely worn and at the same time ensuring its robust operation, which is beneficial to the overall performance and efficiency of the micro fluid pump. At the same time, the shaft intermediate assembly can be installed in the micro fluid pump in a simple and space-saving manner, thereby saving installation costs and facilitating the realization of a compact micro fluid pump.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem and satisfy the above-mentioned demand, the utility model provides a micro fluid pump, micro fluid pump includes: a motor having a motor shaft extending along an axis; a main housing connected to the motor and defining an accommodating space; a rotary wheel which receives the torque transferred by the motor to rotate and is provided with an eccentric pendulum shaft; 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 crank lever having a first end connected to the balance staff and a second end opposite to the first end connected to the diaphragm body to drive the diaphragm unit to perform reciprocating compression and suction motions; wherein the fluid pump further comprises an axial support assembly fixed at least relative to the main housing and supporting the curved rod in the direction of the axis, the axial support assembly comprising a support rod and a support ball projecting from the support rod towards the diaphragm mount, and wherein the support ball and the support rod are configured to form a subassembly connected to each other.

Thus, in the micro fluid pump according to the present invention, the axial pressure experienced by the curved rod, for example from the diaphragm body mounting seat, can be transmitted to the main housing via the axial support assembly, so that the axial load of the curved rod can be effectively reduced, which on the one hand facilitates the robust operation of the curved rod and thus of the diaphragm body mounting seat and the diaphragm body carried thereby, thereby facilitating the overall performance and efficiency of the micro fluid pump; on the other hand, this ensures that the knee lever is not reduced in mechanical strength by being subjected to excessive axial loads, thereby preventing premature wear of the knee lever, extending the life cycle of the knee lever and thus improving the cost-effectiveness of the knee lever and thus of the entire microfluidic pump.

Furthermore, in the micro fluid pump according to the present invention, by configuring the support ball and the support rod in the axial support assembly to be able to form a subassembly connected with respect to each other, the axial support assembly can be easily installed in the micro fluid pump, saving installation cost and time.

Furthermore, the micro fluid pump according to the present invention may further comprise one or more of the following features, taken alone or in combination.

In some embodiments, the support ball and the support rod are connected in a loose fit relative to each other.

In some embodiments, a recess is provided in the support rod, the support ball and the support rod being connected in a loose fit relative to each other by a paste-like lubricating oil provided in the recess.

That is, in the above-mentioned embodiment, since the support ball and the support rod form a loose fit, it is possible to ensure that the support ball has a certain rotational degree of freedom with respect to the support rod, so that when the support ball axially supports the knee lever, the support ball not only generates sliding friction with respect to the knee lever, but also generates rolling friction with respect to the knee lever, thereby ensuring that the axial pressure from the knee lever is absorbed in a more efficient and smooth manner, which will reduce or slow down the wear on the support ball and on the support rod, thereby facilitating the extension of the service life thereof. Also, this also contributes to a smoother and more stable operation of the entire micro fluid pump.

In some embodiments, the support ball is a tight fit to the support rod. This makes it possible to preassemble the support ball and the support rod in a very simple manner as a subassembly which is fixed relative to one another.

In some embodiments, the support ball is a close fit to the support rod by a form fit. This way the assembly between the support ball and the support bar is made simpler.

In some embodiments, the support ball is welded or bonded to the support rod. This way is not only simple and easy to operate, but also ensures a very secure connection.

In some embodiments, the support ball is secured to the support rod by a fastener.

In some embodiments, the support ball is secured to the support rod by a stud or pin integrally formed with the support ball.

In some embodiments, the support balls are steel balls. The steel ball has high mechanical strength and can effectively bear and transmit axial pressure, which is beneficial to the steady operation of the whole micro fluid pump.

In some embodiments, the knee lever is provided with a knee lever recess cooperating with the support ball. On the one hand, this contributes to a good cooperation between the support ball and the knee lever; on the other hand, this is advantageous for achieving a more compact structure.

In some embodiments, the knee lever comprises an insert, the knee lever recess being provided on the insert. For example, the insert may be mechanically stronger than the knee lever, thereby further protecting the knee lever from damage due to forces.

In some embodiments, the radius of curvature of the support ball is less than the radius of curvature of the knee lever recess. Thus, point contact can be formed between the supporting ball and the crank recess, so that the arrangement of the supporting ball does not influence the normal movement amplitude of the crank during operation, and therefore, the normal movement amplitude of the diaphragm body mounting seat and the diaphragm body carried by the diaphragm body mounting seat is ensured, and the operation efficiency of the micro fluid pump is ensured.

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

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

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort. In the drawings:

fig. 1 illustrates a perspective view of a micro fluid pump according to an embodiment of the present invention;

fig. 2 illustrates an exploded perspective view of a micro fluid pump according to an embodiment of the present invention;

FIG. 3 illustrates a longitudinal cut-away view of a micro fluid pump in an assembled state according to an embodiment of the present invention;

FIG. 3a shows a partial view of FIG. 3, showing the location of the support protrusions;

fig. 4 illustrates, in partial plan view, a torque transmission path from a motor to a runner in a micro fluid pump according to an embodiment of the present invention;

fig. 5 shows a perspective view of a curved lever used in a micro fluid pump according to an embodiment of the present invention from one side;

fig. 6 shows a perspective view of a curved lever used in a micro fluid pump according to an embodiment of the present invention from another side;

FIG. 7 illustrates another longitudinal cut-away view of a micro fluid pump in an assembled state according to an embodiment of the present invention;

fig. 8 illustrates a perspective view of a portion of a micro fluid pump showing a fixed plate for an intermediate shaft in a transmission assembly, according to an embodiment of the present invention;

FIG. 9 is a top view of a portion of the micro fluid pump of FIG. 8;

fig. 10 illustrates a partial cross-sectional view of a transmission assembly according to various embodiments of the present disclosure, schematically showing a reduced diameter portion on the intermediate shaft and a reduced diameter portion in the central bore of the second gear 114;

fig. 11 illustrates a perspective view of a portion of a micro fluid pump according to another embodiment of the present invention, showing an aperture disposed in a side wall of a main housing; and

FIG. 12 illustrates a top view of a portion of the micro fluid pump according to the embodiment of FIG. 11 showing a support beam for an intermediate shaft in the transmission assembly.

It should be noted that the various figures are merely schematic representations of the location and mounting of the various components of the microfluidic pump, and are not drawn to precise physical scale.

List of reference numerals

100 micro fluid pump

110 motor

111 motor shaft

112 first gear

113 intermediate shaft

1131 first axial end

1132 second shaft end

1133 reduced diameter section

114 second gear

1141 necking part

115 third gear

116 fourth gear

120 main casing

121 first longitudinal end

122 concave part

123 second longitudinal end

124 groove

125 first pillar portion

126 screw

127 mounting seat

128 bottom

Opening 129

1201 side wall of a housing

1202 side wall of housing

130 diaphragm body mounting base

140 valve seat

150 upper cover

160 diaphragm body

161 diaphragm unit

170 axial support assembly

171 support body

172 support projection

180 rotary wheel

181 eccentric hole

182 pendulum shaft

190 curved bar

191A protrusion

192 holes

193 main panel

194 curved lever recess

195 hollow part

196 insert

210 fixing plate

211 first fixed end

212 second fixed end

220 supporting beam

221 first branch

222 second branch

223 tip

230 cover body

X motor rotation axis

Central axis of the O-shaped curved bar

Intersection of C motor rotation axis and center axis of crank

Detailed Description

Hereinafter, a micro fluid pump and a pressure fluid application apparatus including the same according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. To make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.

Thus, the following detailed description of the embodiments of the present disclosure, presented in conjunction with the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the 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.

The singular forms include the plural unless the context otherwise dictates otherwise. Throughout the specification, the terms "comprises," "comprising," "has," "having," "includes," "including," "having," "including," and the like are used herein to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

In addition, even though terms including ordinal numbers such as "first", "second", etc., may be used to describe various elements, the elements are not limited by the terms, and the terms are used only to distinguish one element from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the scope of the present disclosure.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally placed when the disclosed products are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used merely for convenience of describing and simplifying the present disclosure, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present disclosure.

As shown in fig. 1-4, wherein fig. 1 shows a perspective view of a micro fluid pump 100 according to an embodiment of the present invention in an assembled state, fig. 2 shows an exploded perspective view of the micro fluid pump 100 according to an embodiment of the present invention, fig. 3 shows a longitudinal cut-away view of the micro fluid pump 100 according to an embodiment of the present invention in an assembled state, fig. 4 shows a torque transmission path from a motor to a runner in a micro fluid pump according to an embodiment of the present invention in a partial plan view, and the micro fluid pump 100 according to the present invention at least includes a motor 110, a main housing 120, a runner 180, a diaphragm body mount 130, a crank 190 and a transmission assembly, for example.

Therein, as shown in fig. 2-4, the motor 110 has a motor shaft 111 extending in the direction of a rotational axis X, for example parallel to the longitudinal direction of the micro fluid pump 100, or for example coinciding with the longitudinal central axis of the micro fluid pump 100. It should be noted that embodiments of the present disclosure are not limited by the rotational speed of the motor and its type.

In one particular embodiment, as shown in fig. 1-4, the main housing 120 extends generally in a longitudinal direction and is generally cylindrical in shape, for example, square with rounded corners in cross-section. Of course, the main housing 120 may be provided in other shapes as desired. The main housing 120 defines a receiving space that can be used to receive various components of the micro fluid pump 100 according to the present invention, such as a runner 180, a bell crank 190, a transmission assembly, and an optional axial support assembly 170, which will be described in more detail below. As shown, the main housing 120 is connected to the motor 110, e.g. at a first longitudinal end 121 thereof to the motor 110, e.g. by engagement between a gear provided in the main housing 120 and a gear provided on the motor shaft 111 to enable transmission of torque of the motor 110 into the main housing 120. And, for example, the motor 110 and the main housing 120 are connected to each other such that the motor shaft 111, the motor rotation axis X, and the longitudinal center line of the main housing 120 may coincide with each other.

As shown in fig. 2 to 4, a runner 180 may be provided in the main housing 120 and configured to receive torque transmitted from the motor 110 and thus rotate, and an eccentric pendulum shaft 182, i.e., a pendulum shaft 182 disposed offset with respect to a central axis of the runner 180, is provided on the runner 180. In a specific embodiment, as best shown in fig. 2, an eccentric hole 181 is provided on the runner 180 offset with respect to the central axis thereof, and a pendulum shaft 182 is inserted at one end and fixed in the eccentric hole 181 such that the pendulum shaft 182 is, for example, at an angle with respect to the motor rotation axis X.

Referring to fig. 1-3, the diaphragm body mount 130 is coupled to the main housing 120, for example, to the main housing 120 at the second longitudinal end 123 of the main housing 120. And a diaphragm body 160 (shown in fig. 2) having a plurality of diaphragm cells 161 is provided on the diaphragm body mount 130. For example, the diaphragm body 160 may include, for example, a plurality of integrally formed water bladders (e.g., upper openings), wherein each water bladder is a diaphragm unit 161.

As shown in fig. 2-3, the knee lever 190 may be disposed in the receiving space, and a first end of the knee lever 190 is coupled to the swing shaft 182 and a second end opposite to the first end is coupled to the diaphragm body 160. For example, a protrusion 191 may be provided at the lower longitudinal end of the knee lever 190, the protrusion 191 may be provided with a hole 192 (shown in fig. 3 and 5) that receives at least a portion of the pendulum shaft 182, i.e., at least a portion of the pendulum shaft 182 may be inserted and secured into the hole 192 to establish a mechanical and dynamic connection between the pendulum shaft 182 and the knee lever 190. The protrusion 191 may be integrally formed with the curved lever 190, for example. In a particular embodiment, as shown in fig. 5-6, the protrusion 191 may extend downward from the center of the lower longitudinal end of the curved bar 190. Thus, when the runner 180 rotates together with the swing shaft 182 eccentrically disposed thereon, the swing shaft 182 drives the crank shaft 190 to perform a repetitive swing motion, and the crank shaft 190 in turn drives the diaphragm unit 161 to perform reciprocating compression and suction motions. This reciprocating compression and pumping motion is intended to characterize the diaphragm elements 161 within the diaphragm body 160 as being alternately in compression and tension. For example, if the diaphragm body is a water bag body integrated with a plurality of water bags, when the curved rod moves downwards and pulls down the water bags, the water bags are in the process of pumping movement, the air pressure in the water bags is reduced, and fluid enters the water bags; on the contrary, when the curved rod moves upward and presses the water bag, the water bag is in a compression motion process, and the air pressure in the water bag rises, thereby outputting fluid with high pressure.

As shown in fig. 2 and 8, in a specific embodiment, in order to effectively transmit the power of the motor to the runner, the transmission assembly used in the micro fluid pump according to the present invention may include: a first gear 112 provided on the motor shaft 111, the first gear 112 being, for example, provided outside the main housing 120, for example, in a recess 122 provided on a first longitudinal end 121 of the main housing 120, as shown in fig. 3; an intermediate shaft 113 provided in the main housing 120 and extending parallel to the axis direction X; a second gear 114 provided on the intermediate shaft 113; a third gear 115 provided on the intermediate shaft 113 and rotationally fixed with respect to the second gear 114; and a fourth gear 116 rotationally fixed with respect to the wheel 180, and the fourth gear 116 is fitted on a shaft mounted to the bottom of the main housing 120, for example. Thus, through the transmission assembly, the torque generated by the motor 110 is transmitted to the first gear 112 through the motor shaft 111, is transmitted to the second gear 114 engaged with the first gear 112, and is thus transmitted to the third gear 115 integrally rotated with the second gear 114, and is then transmitted to the fourth gear 116 engaged with the third gear 115, and is thus transmitted to the runner 180. Thus, the turning wheel 180 can drive the swing shaft 182 to rotate together.

When torque is transmitted to the first gear 112 and thus to the second gear 114 through the motor shaft 111 after the motor is started, the second gear 114 may be polarized by a force, which causes the intermediate shaft 113 supporting the second gear 114 to be also polarized. To prevent polarization of the intermediate shaft 113 and the operational instability of the entire drive assembly and thus the entire micro fluid pump caused by such polarization, the present invention proposes the following ways of fixing the intermediate shaft 113, as shown in fig. 7-9: mounting the first shaft end 1131 of the intermediate shaft 113 to a mounting seat 127 provided in the bottom 128 of the main housing 120, the mounting seat 127 may be integrally formed with the bottom 128 of the main housing 120, or may be a separate component fixed to the bottom 128 of the main housing 120, for example, the first shaft end 1131 of the intermediate shaft 113 may be inserted into a hole of the mounting seat 127 to form a tight fit to fix the first shaft end 1131 of the intermediate shaft 113 to the mounting seat 127, although this fixing manner is merely illustrative; meanwhile, the second shaft end 1132 of the intermediate shaft 113 is mounted to the fixing plate 210 fixed to the main housing 120, thereby keeping the intermediate shaft 113 fixed with respect to the main housing 120 and effectively absorbing polarization transmitted to the intermediate shaft 113 by the second gear 114 and/or the third gear 115 by providing the fixing plate 210.

In one particular embodiment, as shown in fig. 7-9, a hole may be provided at a substantially central location of the fixing plate 210 and the second axial end 1132 of the intermediate shaft 113 may be inserted into the hole and the fixing plate 210 may be fixed relative to the intermediate shaft 113 by a tight fit, i.e., an interference fit. In an embodiment, not shown, the second shaft end 1132 of the intermediate shaft 113 is fixed to the fixing plate 210 by screws, in which case threaded holes may be provided on the second shaft end face and corresponding threaded holes may be provided on the fixing plate 210, the screws being screwed through corresponding threaded holes provided in the second shaft end face and in the fixing plate 210, thereby fixing the intermediate shaft 113 and the fixing plate 210 together. Of course, the fixing of the intermediate shaft 113 with respect to the fixing plate 210 is not limited thereto, and any means for fixing the intermediate shaft with respect to the fixing plate is possible, for example, by riveting, even welding, or the like.

As shown in fig. 8 to 9, in order to fix the fixing plate 210 with respect to the main housing 120, the fixing plate 210 may be provided with a first fixing end 211 and a second fixing end 212 for fixing to the main housing 120. In a specific embodiment, as shown in fig. 8, the first fixed end 211 of the fixing plate 210 may be fixed to a first pillar portion 125 extending upward from the bottom 128 of the main housing 120 inside the main housing 120, and the first pillar portion 125 may be, for example, integrally molded with the bottom 128 of the main housing 120, or may be a separate component fixedly secured to the bottom 128 of the main housing 120. The first fixing end 211 of the fixing plate 210 may be fixed to the first pillar portion 125 by a screw 126, for example, a screw hole may be provided at the first fixing end 211 of the fixing plate 210 and a corresponding screw hole may be provided on an end surface of the first pillar portion 125, and then the screw may be tightened into the corresponding screw holes provided in the first fixing end 211 of the fixing plate 210 and the end surface of the first pillar portion 125, thereby achieving a firm fixation between the first fixing end 211 of the fixing plate 210 and the first pillar portion 125. Of course, this securing arrangement is merely exemplary, and any other possible securing arrangement may be selected to secure the first securing end of the fixation plate relative to the first post portion.

In this embodiment, in a more specific embodiment (not shown), similar to the first fixed end 211, the second fixed end 212 of the fixing plate 210 can also be fixed to another post portion extending upward from the bottom 128 of the main housing 120 inside the main housing 120, and the same or a different manner of fixing can be used. It should be noted that the respective column parts for fixing the first and second fixing ends 211 and 212 may be provided separately from the side walls of the main housing 120, or may be provided in abutment with the side walls of the main housing 120, and specific positions of the column parts may be provided as needed or available space in the main housing.

In another more specific embodiment, the second fixed end 212 of the fixed plate 210 may be fixed to the main housing 120 in a different manner from the first fixed end 211. As shown in fig. 8-9, the second fixed end 212 may be fixed to the main housing 120 by a form fit. In this case, first and second positive-fit features that are complementarily shaped and can be fitted with each other may be provided on the second fixed end 212 of the fixed plate 210 and the corresponding side wall of the main housing 120, respectively, so that the fixation of the second fixed end 212 of the fixed plate 210 with respect to the main housing 120 is achieved by the positive fit formed between the first and second positive-fit features. Specifically, as shown in fig. 8-9, the second positive-fit feature provided in the side wall of the main housing 120 may be embodied as a groove 124 extending parallel to the axis of rotation at least partially along the side wall, while the first positive-fit feature provided at the second fixed end 212 of the fixation plate 210 may be a protrusion that may be inserted into the groove 124. Of course, such form-fitting is merely illustrative, and any suitable other form is possible and within the scope of the invention.

Thus, in the present invention, the fixing plate 210 for holding the intermediate shaft 113 can make full use of the available space in the main casing 120 without occupying an unnecessary space, thereby providing the fixing plate 210 in a space-saving compact manner and ensuring its holding effect on the intermediate shaft 113.

As shown in fig. 7, in order to install the intermediate shaft 113 and the second gear 114 mounted thereon in the space-limited main housing 120, and in particular in the case where the first gear 112 and the larger fourth gear 116 have already been installed in place, in order to bypass the larger fourth gear 116 mounted above the first gear 112 from above downwards, in one embodiment the intermediate shaft 113 and the second gear 114 may first be formed as a pre-assembly. For this, as shown in fig. 10, a constricted portion 1133 may be provided on the intermediate shaft 113 such that the intermediate shaft 113 includes the constricted portion 1133 and a non-constricted portion, i.e., a portion of the intermediate shaft 113 other than the constricted portion 1133, while a reduced diameter portion 1141 is provided in the center hole of the second gear 114. In this case, during the installation of the intermediate shaft 113 and the second gear 114, the second gear 114 will have a first position and a second position relative to the intermediate shaft 113, wherein in the first position the reduced diameter portion 1141 of the central bore of the second gear 114 is positioned opposite the non-necked portion of the intermediate shaft 113 such that the second gear 114 is a tight fit on the intermediate shaft 113, and in the second position (the position shown in fig. 10) the reduced diameter portion 1141 of the central bore of the second gear 114 is opposite the necked portion 1133 of the intermediate shaft 113 such that the second gear 114 can rotate relative to the intermediate shaft 113. For this, the diameter of the reduced diameter portion 1141 of the center hole of the second gear 114 may be: a diameter less than or equal to the non-necked portion of the intermediate shaft 113, i.e., to allow the non-necked portion of the intermediate shaft 113 to form a tight or interference fit with the reduced diameter portion 1141 of the central bore of the second gear 114; greater than or equal to the diameter of the reduced neck portion 1133 of the intermediate shaft 113, i.e., the reduced neck portion 1133 of the intermediate shaft 113 may be allowed to form a clearance fit with the reduced diameter portion 1141 of the central bore of the second gear 114.

As also shown in fig. 7, in a more specific embodiment, the second gear 114 and the third gear 115 mounted on the intermediate shaft 113 may be two gears of an integral step gear, in which case similarly, the intermediate shaft 113 and the step gear mounted on the intermediate shaft 113 may be first formed as a pre-assembly in order to install the intermediate shaft 113 and the step gear in the space-limited main housing 120, and in particular to bypass the larger fourth gear 116 mounted above the first gear 112 from above downwards in the case that the first gear 112 and the larger fourth gear 116 are already installed in place. And similarly, a reduced diameter portion 1133 may be provided on the intermediate shaft 113 such that the intermediate shaft 113 includes the reduced diameter portion 1133 and a non-reduced diameter portion, i.e., a portion of the intermediate shaft 113 other than the reduced diameter portion 1133 while providing the reduced diameter portion 1141 in the center hole of the cone. In this case, during installation of the intermediate shaft 113 and the cone pulley, the cone pulley will have a first position and a second position relative to the intermediate shaft 113, wherein in the first position the reduced diameter portion 1141 of the central bore of the cone pulley is opposite the non-necked portion of the intermediate shaft 113 so that the cone pulley is a tight fit on the intermediate shaft 113, and in the second position the reduced diameter portion 1141 of the central bore of the cone pulley is opposite the necked portion of the intermediate shaft 113 so that the cone pulley can rotate relative to the intermediate shaft 113. For this, the diameter of the reduced diameter portion 1141 of the center hole of the cone pulley may be: a diameter less than or equal to the non-necked portion of the intermediate shaft 113, i.e., allowing the non-necked portion of the intermediate shaft 113 to form a tight or interference fit with the reduced diameter portion 1141 of the central bore of the cone pulley; greater than or equal to the diameter of the reduced neck portion 1133 of the intermediate shaft 113, i.e., the reduced neck portion 1133 of the intermediate shaft 113 may be allowed to form a clearance fit with the reduced diameter portion 1141 of the central bore of the cone pulley.

In either case, the necked-down portion of the intermediate shaft 113 cannot be disposed immediately adjacent the first shaft end 1131 for insertion into the mount 127 of the bottom portion 128 of the main housing 120, and the non-necked portion of the intermediate shaft 113 should be disposed at least at the first shaft end 1131 of the intermediate shaft 113, this ensures that a pre-assembly can be formed by simply inserting a small section near the first shaft end 1131 of the intermediate shaft 113 into the reduced diameter portion 1141 in the second gear 114 or cone, allowing the preset to be able to pass obliquely around the fourth gear 116 in an angular orientation relative to the axis of rotation X and to the mounting position of the second gear 114, or of the step pulley, after which, and by pressing the intermediate shaft 113 downwardly, the first shaft end 1131 of the intermediate shaft 113 is inserted into the mounting block 127 and is mounted in place therein, at this time, the constricted portion 1133 of the intermediate shaft 113 is positioned opposite the reduced diameter portion 1141 of the center hole of the second gear 114 or the stepped pulley. In this way, it is possible to ensure sufficient utilization of the limited space inside the main housing 120 without having to provide the main housing 120 larger, thereby allowing a very compact overall structure.

In the case where the second gear 114 and the third gear 115 constitute a stepped gear, in one embodiment (not shown), the reduced diameter portion of the stepped gear may also be disposed in the central hole of the third gear 115 above the second gear 114 as the case may be. It will be appreciated that the specific location of the reduced diameter portion and the constricted portion is not precisely defined as long as it is ensured that the pre-assembly formed by the second gear 114 or the cone pulley and the cone pulley can be brought to the mounting position by bypassing the fourth gear 116.

It should also be noted that in either case, the second position is the operative position of the transmission assembly. And in this case, the intermediate shaft 113 may be non-rotating.

In another different embodiment of the above-described configuration of the main housing 12, as shown in fig. 11, in order to conveniently fit the intermediate shaft 113, the second gear 114 and the third gear 115 into the limited space inside the main housing 120, an opening 129 may be provided in the side wall of the main housing 120 at a position corresponding to the level of installation of the second gear 114 and the third gear 115, the opening 129 being sized to at least allow the second gear 114 and the third gear 115 to enter the main housing 120 through the opening 129 and to be installed in place; also, in this case, the micro fluid pump 100 further includes a cover 230 for being mounted to the opening 129 to cover the opening 129. In a more specific embodiment, and as shown in FIG. 11, the opening 129 may be provided as a rectangular window; however, it should be understood that any suitable shape for the aperture is possible, so long as it is sized to allow the second and third gears to pass through the aperture into the main housing and be mounted in place.

Furthermore, as shown in fig. 11, in case the main housing 120 is oblong in cross section perpendicular to the rotation axis X (oblong here can be understood as rectangular with rounded corners), the opening 129 may be provided through at least a portion of two adjacent side walls 1201, 1202 of the main housing 120 at the same time, i.e. the opening 129 is provided at one corner of the main housing 120, which allows for a larger open space for more convenient placement of the intermediate shaft 113, the second gear 114 and the third gear 115 than if the opening 129 were provided in a single side wall of the main housing 120.

It should be noted that this embodiment is applicable to the case where the second gear 114 and the third gear 115 are separate gears, and also to the case where the second gear 114 and the third gear 115 form an integral stepped gear. In any case, during assembly, the second gear 114 and the third gear 115, which are configured to be integrally selected, may be first placed in the mounting position in the main housing 120 through the opening 129, then the intermediate shaft 113 is passed through the central holes of the second gear 114 and the third gear 115 from top to bottom, and finally mounted in place in the mounting seat 127 of the bottom 128 of the main housing 120 via the first shaft end 1131 thereof. Thus, the provision of the aperture 129 allows for ease of maintenance and replacement of the intermediate shaft 113, the second gear 114 and the third gear 115. In particular, the provision of the aperture 129 may allow for the application of lubrication oil to the transmission assembly therethrough to ensure smooth operation of the transmission assembly. In addition, heat inside the main housing 120 can also be dissipated through the opening 129; in this case, the cover 230 for covering the opening 129 may be formed of a material that can emit heat or constructed in a structure that allows heat to be emitted, for example. In addition, the mounting and operation of the internal components of the main housing 120 can be observed through the opening 129 to facilitate monitoring of the operation of the micro fluid pump 100.

Still in this embodiment, the above-described fixing plate 210 for holding the intermediate shaft is allowed to be integrally formed with the main housing 120 without hindering the mounting of the fourth gear 116 and other components, because it is no longer necessary to mount the second gear 114 and the third gear 115 from above in this embodiment.

And still in this embodiment, as shown in fig. 12, the fixing plate for holding the intermediate shaft may be replaced by a support beam 220, that is, in this case, the first axial end of the intermediate shaft 113 is fitted into a fitting seat 127 (shown in fig. 7) of the bottom 128 of the main casing 120, the fitting seat 127 is integrally formed with or separately formed from the bottom 128 of the casing 120 and fixed thereto, and the second axial end of the intermediate shaft 113 is fitted to the support beam 220 connected to the main casing 120. In this case, the support beam 220 is integrally formed with the main housing 120, which allows saving of manufacturing and installation costs. Further, as shown in fig. 12, the support beam may be V-shaped, which includes a top end 223 and first and second branches 221 and 222 extending from the top end 223 following the V-shape, the second axial end of the intermediate shaft 113 is mounted to the top end 223 of the support beam 220, and the first and second branches 221 and 222 are connected to the side wall of the main casing. The support beam 220 having the V-shape allows the holding action of the intermediate shaft 113 to be achieved in a manner that does not obstruct the mounting of other components within the main casing 120, ensuring concentricity of the intermediate shaft 113 with the second gear 114 and the third gear 115 in a more compact manner. The connection of the intermediate shaft 113 to the top end of the V-shaped support beam 220 may be made in the manner described above, including a tight fit, threaded fastening, welding, and the like. The vertex angle of the V-shaped support beam 220 is, for example, in the range of 60 ° to 180 °.

Of course, the V-shaped support beams 220 may also be formed separately from the main housing 120 and secured by their first and second legs 221, 222 to respective posts extending upwardly from the bottom of the housing 120 as described above, or by their first and second legs 221, 222 forming a form fit with the side walls of the housing to secure the V-shaped support beams 220 relative to the main housing 120, similar to as described above with respect to the securing plates 210. And further, the V-shaped support beam 220 itself may also be formed of separate first and second branches.

As shown in fig. 2 to 4, the micro fluid pump according to the present invention may further include an axial support assembly 170 for supporting the curved bar 190 in the direction of the motor rotation axis X, and it may also be at least partially disposed in the receiving space of the main housing 120, and in order to provide axial support to the curved bar 190 and effectively transmit the axial pressure received by the curved bar 190 to the main housing 120, the axial support assembly 170 may be fixed with respect to the main housing 120. In one particular embodiment, as shown in fig. 2-3, the axial support assembly 170 includes a support body 171 and a support protrusion 172 protruding from the support body 171 toward the diaphragm body mount 130, the support body 171 being fixed relative to the main housing 120 and the curved rod 190 being supported on the support protrusion 172, the support protrusion 172 being, for example, spherical or conical and may be made of steel, ceramic, or cemented carbide. It should be noted that the spherical or conical portion of the support protrusion 172 is a portion for supporting the curved bar 190, and the shape of the portion of the support protrusion 172 coupled with the support main body 171 is not limited and may be any shape that can achieve coupling with the support main body 171. Alternatively, as shown in fig. 2, the support body 171 is a support rod, and the support protrusion 172 includes a support ball, such as a steel ball, so as to ensure the mechanical strength of the support ball, so that the axial pressure can be effectively borne and transmitted, which is beneficial to the robust operation of the entire micro fluid pump.

In a more specific embodiment, in order to enable the axial support assembly 170 to be installed in the micro fluid pump 100 in an easy manner, thereby saving installation time and cost, the support body 171 and the support protrusion 172 may be configured to form a subassembly that can be connected to each other to facilitate installation of the axial support assembly 170 in place in the micro fluid pump 100. It should be noted that herein, "connected to each other" does not mean only rigidly connected, and may include connections that are realized in a loose-fitting manner and a tight-fitting manner.

In one embodiment, the support protrusion 172 and the support body 171 are connected with a loose fit with respect to each other. In a specific embodiment, a recess, for example a non-through recess, may be provided in the support body 171, the support protrusions 172 and the support body 171 being connected in a loose fit with respect to one another by means of a grease-like lubricating oil provided in the recess. By providing a loose fit between the support protrusions 172 and the support body 171, it is ensured that the support protrusions 172 have a certain degree of freedom of rotation with respect to the support body 171, so that when the support protrusions 172 act to axially support the knee lever 190, the support protrusions 172 not only generate sliding friction with respect to the knee lever 190, but also generate rolling friction with respect to the knee lever 190, thereby ensuring that the axial pressure from the knee lever 190 is absorbed in a more efficient and smoother manner, which will reduce or slow down the wear on the support protrusions 172 and on the support body 171, thereby facilitating an extension of the life cycle thereof. Also, this also contributes to a smoother and more stable operation of the entire micro fluid pump 100.

In another embodiment, the support protrusion 172 may be a tight fit to the support body 171, which makes the subassembly formed by the support protrusion 172 and the support body 171 easier to install in place in the micro fluid pump 100. In this case, in one embodiment, the supporting protrusion 172 may be tightly fitted to the supporting body 171 by a shape-fitting; for example, a recess may be provided in the support main body 171, and a mounting portion corresponding to the recess may be provided in the support projection 172, the mounting portion being sized slightly larger than the recess so that the mounting portion can be directly fitted tightly in the recess without using other auxiliary mounting means, which is obviously simple and easy. It should be noted that the form fit described herein is merely illustrative and that other possible forms of form fit are within the scope of the present disclosure. In another variant, the support protrusions 172 may be welded or glued to the support body 171 in such a way as to ensure a firm connection between the support protrusions and the bearing body. In yet another modification, the support protrusion 172 may be fixed to the support body 171 by a fixing member, in which case the support protrusion 172 is fixed into the support body 171 by, for example, a stud or a pin integrally formed therewith, and more specifically, the support protrusion 172 may be a ball head portion of a ball stud, which is a bolt portion of the ball stud, so that the support protrusion 172 may be screwed into a screw hole of the support body 171 by the bolt portion; in the case of a pin, the support protrusion 172 may be tightly fitted into a hole formed in the support main 171 by the pin.

According to a particular embodiment, in order to be able to arrange the support body 171 and the support protrusion 172 in the micro fluid pump in a compact, space-saving manner, the knee lever 190 may comprise a hollow 195, such that the support body 171 can be arranged in this hollow 195 on a plane transverse to the longitudinal direction. More specifically, as shown in fig. 5-6, the knee lever 190 may include a main panel 193 and a protrusion 191 extending downward below the main panel, the protrusion 191 for receiving at least a portion of the pendulum shaft 182 as described above to establish a mechanical and dynamic connection between the pendulum shaft 182 and the knee lever 190, a hollow 195 may then be disposed between a lower surface of the main panel 193 and a top of the protrusion 191, i.e., the protrusion 191 may extend downward below the hollow 195, and the support body 171 is inserted into the hollow 195 above the protrusion 191 and fixed to the main housing 120, for example, at both ends thereof.

Also in this embodiment, the knee lever 190 may be further provided with a knee lever recess 194 (shown in fig. 3 and 5) that is engaged with the support protrusion, for example, the knee lever recess 194 is located above the hollow portion 195 and is provided at a central portion of the main panel 193 of the knee lever 190. More specifically, the knee lever 190 may comprise an insert 196, for example at its central region, which insert 196 is embedded, optionally by overmolding, in the main panel 193 of the knee lever 190, and a knee lever recess 194 is provided on this insert 196. Such an insert is provided as a force-bearing insert, which protects the knee lever and further ensures a stable operation of the knee lever. According to a specific embodiment, as shown in fig. 3a, which is a partial view of fig. 3, the support protrusion 172 is disposed at an intersection point C of the motor rotation axis X and the center axis O of the curved lever 190, and the support protrusion 172 and the curved lever 190 form a point contact therebetween, which coincides with the intersection point C. Thus, such an axial support assembly 170 may effectively transfer axial pressure from the curved rod 190 to the main housing 120. At the same time, this allows the support boss 172 to be positioned without affecting the normal amplitude of motion of the bell crank 190 during operation, and thus ensures normal amplitude of motion of the diaphragm body mount 130 and its carried diaphragm body 160, ensuring operational efficiency of the micro fluid pump 100. In embodiments where the support protrusion 172 is a support ball, the radius of curvature of the support ball is set to be smaller than the radius of curvature of the knee lever recess 194. Thereby, a point contact as described above can be made between the support ball and the knee lever recess.

Further, also in this embodiment, in the case where the support main body 171 is a support rod, the support rod may be inserted into the hollow portion 195 as described above, and may be fixed by its both end portions to the two opposite walls of the main housing 120 by any known conventional fixing means, for example, by using fixing members such as screws, rivets, or by gluing, or by form-fitting. In a more specific embodiment (not shown), the two ends of the support bar can be fixed in recesses provided for this purpose on two opposite walls of the main housing 120, and can be fixed in the recesses, for example by form-fitting. In a more specific embodiment, not shown, the support rod is fixed at the second longitudinal end 123 of the main housing 120 and is mounted between the main housing 120 and the diaphragm body mount 130. In this case, at this second longitudinal end 123 of the main housing 120, a first recess is provided on each of two opposite walls of the main housing 120; while at the longitudinal end of the diaphragm mount 130 connected to the main housing 120, second recesses are provided in each of two opposite walls of the diaphragm mount 130, respectively, and each first recess is aligned with one second recess, the first and second recesses being shaped to cooperate to receive an end of a support rod. More specifically, the first and second recesses simultaneously form a form fit, e.g., an interference fit, with the end of the support rod, such that the interconnection and fixation between the main housing 120 and the diaphragm body mount 130 is simultaneously achieved by such a form fit, which further simplifies the installation between the main housing 120 and the diaphragm body mount 130, and avoids the use of additional components and tools to achieve such installation, while enabling the installation of the axial support assembly in a very compact structure, improving cost-effectiveness.

It should be understood that, according to actual needs, the micro fluid pump 100 may further include, for example, a valve seat 140, an upper cover 150 or other components, and as shown in fig. 2, the upper cover 150, the valve seat 140, the diaphragm body mounting seat 130, the main housing 120 and the motor 110 are hermetically mounted, for example, from top to bottom.

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 maker can stably and continuously output fluid with the pressure of about 10 bar, so that pure espresso coffee can be produced, and the espresso coffee maker 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.

The exemplary embodiments of the micro fluid pump and the pressure fluid application device including the micro fluid pump according to the present invention have been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes may be made to the above-described embodiments without departing from the concept of the present invention, and various combinations of the various technical features and structures of the present invention may be implemented without departing from the scope of the present invention.

The scope of the present disclosure is not defined by the above-described embodiments but is defined by the appended claims and equivalents thereof.

Claims (16)

1. A micro fluid pump, characterized in that the micro fluid pump (100) comprises:

a motor (110) having a motor shaft (111) extending along an axis (X);

a main housing (120) connected to the motor (110) and defining an accommodating space;

a rotary wheel (180) which receives the torque transmitted from the motor (110) to rotate and on which an eccentric pendulum shaft (182) is provided;

a diaphragm body mount (130) coupled to the main housing (120), the diaphragm body mount (130) having a diaphragm body (160) with a plurality of diaphragm cells (161) disposed thereon;

a knee lever (190) having a first end coupled to the pendulum shaft (182) and a second end opposite the first end coupled to the diaphragm body (160) to drive the reciprocating compression and suction motion of the diaphragm unit (161);

wherein the fluid pump (100) further comprises an axial support assembly (170), the axial support assembly (170) being fixed at least with respect to the main housing (120) and supporting the curved rod (190) in the direction of the axis (X), the axial support assembly (170) comprising a support rod and a support ball protruding from the support rod towards the diaphragm body mount (130), and

wherein the support ball and the support rod are configured to form a subassembly that is connectable to each other.

2. The micro fluid pump of claim 1, wherein the support ball and the support rod are connected in a loose fit relative to each other.

3. The micro-fluid pump as claimed in claim 2, wherein a recess is provided in the support rod, and the support ball and the support rod are connected with a loose fit with respect to each other by a paste-like lubricating oil provided in the recess.

4. The micro fluid pump of claim 1, wherein the support ball is a tight fit to the support rod.

5. The micro fluid pump of claim 4, wherein the support ball is a close fit to the support rod by a form fit.

6. The micro fluid pump of claim 4, wherein the support ball is welded or bonded to the support rod.

7. The micro fluid pump of claim 4, wherein the support ball is secured to the support rod by a fastener.

8. The micro fluid pump of claim 7, wherein the support ball is secured to the support rod by a stud or pin integrally formed with the support ball.

9. The micro fluid pump of any of claims 1-8, wherein the support balls are steel balls.

10. The micro fluid pump according to any of claims 1 to 8, wherein the curved lever (190) is provided with a curved lever recess (194) cooperating with the support ball.

11. The micro fluid pump of claim 10, wherein the curved lever (190) includes an insert (196), the curved lever recess (194) being disposed on the insert (196).

12. The micro fluid pump of claim 10, wherein the support ball has a radius of curvature that is less than a radius of curvature of the curved lever recess (194).

13. A pressure fluid application apparatus, comprising a micro fluid pump (100) according to any one of claims 1 to 12.

14. The apparatus of claim 13, wherein the apparatus is a coffee maker.

15. The apparatus of claim 14, wherein the coffee machine is an espresso machine.

16. The apparatus of claim 13, wherein the apparatus is a dental prophylaxis device.

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