CN214036059U - Micro fluid pump and pressure fluid application device comprising same - Google Patents

Abstract

The utility model relates to a miniature fluid pump, fluid pump includes: a motor having a motor shaft extending along an axis; a first housing section connected to the motor and defining an accommodation space; a second housing section abutting and connected to the first housing section; a rotary wheel which receives the torque transferred by the motor to rotate and is provided with an eccentric pendulum shaft; a crank lever having a first end coupled to the pendulum shaft and a second end opposite the first end coupled to the diaphragm body to drive reciprocating compression and suction motions of a diaphragm chamber of the diaphragm body; wherein the fluid pump further comprises a support bar fixed relative to the first housing section and supporting the curved bar in the direction of the axis; and wherein the support bar is fixedly connected to the first housing section and the second housing section at their interface. The utility model discloses still relate to a pressure fluid application apparatus including above-mentioned miniature fluid pump.

Description

Micro fluid pump and pressure fluid application device comprising same

Technical Field

The utility model relates to a miniature fluid pump. The present invention also relates to a pressurized fluid application device, such as a household dental prophylaxis device, a coffee machine, in particular an espresso machine, comprising such a micro fluid pump.

Background

Micro fluid pumps have a wide range of application scenarios. For example, micro-pumps may be installed in various pressure fluid application devices, such as coffee makers and tooth washers, into which the fluid pump draws water and then pumps the water at a desired pressure. However, different pressure fluid application equipment may have different requirements for the pressure at which the fluid is pumped. For example, in an american coffee machine, a pressure of the pumped water stream of 1 bar is sufficient to obtain an acceptable american coffee. However, for espresso coffee, the pressure of the pumped water stream is required to reach about 9 bar and the water temperature 90 degrees, and a cup of 30 ml of espresso coffee needs to be brewed in 30 seconds before it is acceptable. In addition to high pressure, continuous and stable pressure, low noise and as small a volume as possible of the application device in which the fluid pump is installed for easy placement are required.

One known solution to address the need for high and stable water output pressure is to use a lobe pump, which has the advantage of low noise but is expensive because of the high precision requirements for the mating parts. Another known solution is a vibration pump, which, when operated, generates strong vibrations, causing great noise; in addition, the discharge pressure is either not high enough to meet the demand or the discharge pressure is not continuously stable and thus cannot be continuously operated for a long time, so that it is not suitable for commercial use. Yet another known solution is a rotary pump, typically a vane pump, with vanes driven in rotation by a turbine, which has the advantages of low cost and long-term operation, but is bulky and expensive and not suitable for use in household coffee machines where a micro-pump is required.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to provide a solution to the above-mentioned problems. This object is achieved by a micro fluid pump according to the present invention, said fluid pump comprising: a motor having a motor shaft extending along an axis; a first housing section connected to the motor and defining an accommodation space; a second housing section abutting and connected to the first housing section; a rotary wheel which receives the torque transferred by the motor to rotate and is provided with an eccentric pendulum shaft; a crank lever having a first end coupled to the pendulum shaft and a second end opposite the first end coupled to the diaphragm body to drive reciprocating compression and suction motions of a diaphragm chamber of the diaphragm body; wherein the fluid pump further comprises a support bar fixed relative to the first housing section and supporting the curved bar in the direction of the axis; and wherein the support bar is fixedly connected to the first housing section and the second housing section at their interface.

According to one embodiment, the first housing section is a main housing and the second housing section is a diaphragm body mount having a diaphragm body with a plurality of diaphragm chambers disposed thereon.

According to one embodiment, the main housing is provided with a main housing receiving portion to receive a portion of the support rod along the axis, and the diaphragm body mount is provided with a diaphragm seat receiving portion corresponding to the main housing receiving portion in an axial direction to receive another portion of the support rod along the axis.

This arrangement of the support rod 8 also makes it possible to avoid relative displacements of the two housing sections to which it is fixed relative to each other, in particular in a direction perpendicular to the motor axis, while significantly increasing the pressure range of the fluid pump. In the case of a high-pressure pump, the components of the fluid pump are easily deformed due to the high pressure, and the parts which are matched with each other are easily dislocated, so that the pump cannot normally work or even is damaged. According to the utility model discloses a bracing piece among the miniature fluid pump has effectively avoided taking place this kind of condition between two casing sections.

According to one embodiment, the main housing receiving portion receives half of the height of the support rod along the axis, and the diaphragm seat receiving portion receives the other half of the height of the support rod along the axis.

Thus, when a lateral force occurs which tends to cause relative displacement of the first and second housing sections, the first and second housing sections will be subjected to substantially equal lateral forces, i.e. the lateral forces are distributed substantially evenly to the two housing sections, avoiding premature failure of one of the housing sections due to unequal distribution of forces.

According to one embodiment, the support rod includes a locating feature along the axis, and the main housing receiving portion has a corresponding main housing locating feature along the axis therein.

According to one embodiment, the locating feature is a locating recess facing the main housing and the main housing locating feature is a main housing locating projection.

According to one embodiment, the positioning recess is a through hole and the diaphragm body mount comprises a corresponding diaphragm seat positioning boss.

The feature that the first shell section and/or the second shell section which are easy to generate relative displacement are provided with the feature that the feature is combined with the supporting rod mutually enhances the connection and fixation of the supporting rod and the first shell section and/or the second shell section.

According to one embodiment, the main housing is provided with an axial assembly hole in which a pump assembly bolt is provided, and wherein the main housing receiving portion is provided adjacent to the axial assembly hole.

Such an arrangement provides that the support bar and the fixed and reinforcing pump assembly bolts are disposed in substantially the same plane defined by the axis X and the extension Y of the support bar 8, thereby enhancing the overall strength of the pump and enabling further assurance that relative displacement between adjacent housing sections is avoided.

According to one embodiment, the end of the support rod partially surrounds the axial assembly hole.

Thereby, the support bar and the pump assembly bolt overlap at least partially in a direction perpendicular to a plane defined by the motor axis and the support bar extension line, constituting a multiple strengthening structure, better stabilizing the interconnection between adjacent housing sections and thus better avoiding relative displacement between them.

According to one embodiment, the support bar has a straight shape or an X-shape.

According to one embodiment, the support bar is provided with a support recess in which a support sphere is arranged. When the curved bar moves under the driving of the swing shaft, the support ball body supporting the curved bar does not move along with the curved bar but is fixed relative to the support bar, and the curved bar can move without interference.

The present invention also relates to a pressurized fluid application device, which is a micro fluid pump as described above.

According to one embodiment, the pressure fluid application device is a coffee maker.

According to another embodiment, the pressure fluid application device is a household dental prophylaxis device.

Drawings

FIG. 1 is an assembled overall schematic view of a micro fluid pump according to the present invention;

FIG. 2 is a partial exploded view of an embodiment of a micro fluid pump according to the present invention, schematically illustrating components of the micro fluid pump, and omitting assembly components;

fig. 3 is a partial cross-sectional view of a support rod in an assembled state of a fluid pump, taken along a plane containing the extension line of the support rod and the motor axis, according to an embodiment of the invention;

fig. 4 is a schematic perspective view of a main housing of an embodiment of a micro fluid pump according to the present invention;

fig. 5 is a schematic perspective view of a support rod and a curved rod of an embodiment of a micro fluid pump according to the present invention in an assembled state;

fig. 6 is a schematic cross-sectional view of a support rod and a curved rod of an embodiment of a micro-fluid pump according to the present invention in an assembled state, taken along a plane containing the extension line of the support rod and the motor axis;

fig. 7 is a schematic exploded view of a support rod and a curved rod including an insert of an embodiment of a micro fluid pump according to the present invention;

fig. 8 is a schematic exploded view of a support rod and a curved rod of an embodiment of a micro fluid pump according to the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings of the embodiments of the present invention to carry out clear and complete description on the technical solution of the embodiments of the present invention.

In the present description, the directional expressions "up" and "down" are defined with respect to the assembly direction a (shown in fig. 1 and 2) of the microfluidic pump, the direction oriented in the same direction as the assembly direction a being referred to as "up", and the direction oriented opposite to the assembly direction a being referred to as "down".

Factors for evaluating the performance of the micro fluid pump include the service life, the accuracy of the amount of fluid discharged per time, the accuracy of the total discharge amount in the case of a long service time (for example, the accuracy of the total discharge amount in the case of 100 times, 500 times, 1000 times, and the like), and the like. Failure of any one component to function properly can result in poor performance of the overall pump and even failure to continue to use the pump, so that the pressurized fluid application equipment in which it is installed as a critical component can no longer function properly. This is particularly appreciated where high pressure pumping of fluid is required. Higher fluid pressures being pumped means that the various components of the fluid pump are subjected to much greater pressures than is typical. For example, one type of pressurized fluid application device (e.g., an american coffee machine) requires a fluid pressure of 1 bar, while another type of device requiring a higher pressure (e.g., an espresso machine) requires a fluid pressure of up to 9 bar, and if the pump structure of the former is directly transferred to the latter for use, the pump components are prematurely destroyed due to the excessive pressure, resulting in an excessively short service life of the latter. The utility model provides a miniature fluid pump has solved above-mentioned problem well, and it can be used in a great deal of pressure fluid application apparatus that need high-pressure fluid, and can be applicable to wider pressure range from this.

Fig. 1 shows an assembled overall schematic view of a micro fluid pump according to the present invention. It should be understood that fig. 1 is only a schematic view showing the entire micro fluid pump according to the present invention, but the posture shown in fig. 1 does not mean a state in which it is installed in a pressure fluid application apparatus.

The micro fluid pump according to the present invention may be installed in a pressure fluid application device (not shown). For example, the micro fluid pump may be a micro water pump, and the pressure fluid application device may be a coffee maker in which the micro water pump is installed. The coffee machine uses the water pumped by the micro-pump to make coffee. In particular, the pressurized fluid application device is an espresso coffee machine requiring a pumped water stream at pressures up to 9 bar. The micro fluid pump according to the present invention may also be used, for example, in a household dental prophylaxis device to provide high pressure high velocity water flow to rinse teeth. Furthermore, the micro fluid pump according to the present invention may also be an air pump.

As shown in fig. 1, a micro fluid pump 100 according to the present invention comprises a motor 9, said motor 9 having an axis X. The motor 9 is used to power the operation of the micro fluid pump.

The micro fluid pump 100 also includes a plurality of housing segments. By a housing section is here meant a section forming the housing of the micro fluid pump, for example the entire housing of the pump may be formed by a plurality of sections which in a disassembled state may be separated and which in an assembled state may be connected to each other and assembled together to form the housing of the pump. For example, as shown in fig. 1 and 2, in one embodiment of the present invention, the fluid pump 100 may include a first housing section as the main housing 1 and a second housing section as the diaphragm body mount 2. The main housing 1 is connected at one end thereof to a motor 9 to be assembled therewith. For example, the bottom of the main housing 1 may be fixedly coupled to the upper surface of the motor 9 to be assembled therewith. The diaphragm body mount 2 is located on the other side of the main housing 1 with respect to the motor 9, abutting and being attached to the main housing 1. Diaphragm body mount 2 may have a diaphragm body 20 disposed thereon, as shown in FIG. 2.

The assembly direction a is also schematically shown in fig. 1 for ease of description hereinafter. The assembly direction a is oriented from the motor 9 in the axial direction X towards the main housing 1 mounted thereon.

The main housing 1 may have a cylindrical outer contour, the generatrix of which may be parallel to the axis X of the motor. The main housing 1 shown in fig. 1 has a generally square cylindrical profile, it being understood that the main housing 1 may have other shaped profiles as desired, such as a cylindrical profile, a rectangular cylindrical profile with a generally rectangular cross-section. The main housing 1 defines an accommodating space 11 (fig. 2) therein for accommodating components of the micro fluid pump 100.

The motor 9 may have a motor shaft (not shown in the figures) extending along the axis X. Referring to fig. 2, a motor shaft of the motor 9 may protrude from a surface 91 (i.e., an upper surface 91) of the motor 9 facing the main casing 1. For example, the motor 9 may have a generally cylindrical motor housing, as shown in fig. 1 and 2, with the motor shaft projecting from the center of its circular upper surface 91. The torque of the motor 9 is output through the motor shaft and is transmitted via, for example, a series of transmission gears to drive the micro fluid pump to operate.

The micro fluid pump 100 may further include a valve seat 3 and an upper cover 4. The valve seat 3 is connected to the diaphragm body mounting seat 2 on one side and to the upper cover 4 on the other side. Thereby, the motor 9, the main housing 1, the diaphragm body mount 2, the valve seat 3, and the upper cover 4 are sequentially assembled together in the assembly direction a shown in fig. 2, in which the main housing 1, the diaphragm body mount 2, the valve seat 3, and the upper cover 4 may be connected together by fixing members. In one example, the securing element may be an elongated securing element, such as a pump assembly bolt 43 (shown in FIG. 1), that passes through the upper cover 4, the valve seat 3, the diaphragm body mount 2, and the main housing 1. In another possible example (not shown), the upper cover 4, the valve seat 3, the diaphragm body mounting base 2 and the main housing 1 may be fixedly connected together by snap springs.

Further, the cross sections of the upper cover 4, the valve seat 3, the diaphragm body mount 2, and the main housing 1 in a plane perpendicular to the assembling direction a may also have substantially the same outer shape to form a uniform appearance as a whole after assembly.

As shown in fig. 2, the diaphragm body 20 is provided on the diaphragm body attachment seat 2, and the diaphragm body 20 has a plurality of diaphragm units 21. In the example of fig. 2 a diaphragm body 20 with 4 diaphragm elements 21 is shown. The diaphragm body 20 may have other numbers of diaphragm elements, such as 2, 3, 5, etc., as desired. For this purpose, the diaphragm body mount 2 is provided with openings corresponding to the number of diaphragm units 21 for receiving the respective diaphragm units 21.

Each diaphragm unit 21 may include a diaphragm cavity 211 and a mounting shank 212. The diaphragm chamber 211 may have a substantially bowl-like shape and comprise an opening which opens in a direction towards the valve seat 3. The mounting stem 212 is located below the diaphragm cavity 211 and extends downward from the bottom of the diaphragm cavity 211. The diaphragm body 20 has a mounting flat portion 22, and the mounting flat portion 22 connects the diaphragm units 21 together to form the integrated diaphragm body 20, for example, connects the diaphragm units 21 together in the vicinity of the opening position thereof.

When assembled, the diaphragm body 20 is mounted to the diaphragm body mount 2 from above the diaphragm body mount 2 such that the mounting planar portion 22 of the diaphragm body 20 is positioned on an upper face of the diaphragm body mount 2, for example, in a recess formed thereon, while at least a portion of the diaphragm cavity 211 of the diaphragm unit 21 is received in a corresponding opening of the diaphragm body mount 2, and the mounting stem 212 is exposed from the other side (lower side) of the diaphragm body mount 2 through the corresponding opening. Continuing with reference to the partial exploded view of fig. 2. The valve seat 3 is provided with an inlet valve 31 attached to the valve seat 3 from below the valve seat 3, and an outlet valve 32 attached to the valve seat from above the valve seat 3. The valve plates of the inlet valve are positionally matched with the diaphragm units 21 and are equal in number. It should be understood that the inlet valve may also have other forms. While a one-piece discharge valve 32 is shown in FIG. 2, it should be understood that the discharge valve may have other forms, such as a discrete valve plate.

As shown in fig. 1 and 2, the upper cover 4 is fixedly mounted to the valve seat 3, and includes an inlet 42 allowing fluid to enter and an outlet 41 allowing fluid to exit.

With continued reference to fig. 2, the micro fluid pump 100 according to the present invention further includes a runner 5. The runner 5 is capable of receiving torque transmitted by the motor 9 to rotate, for example, the output torque of the motor 9 may be transmitted to the runner 5 through a series of transmission elements (e.g., a series of gears). The runner 5 may be provided with an eccentric pendulum shaft 6 on its upper side. The pendulum shaft 6 can be inserted into a hole in the upper side of the wheel 5. The pendulum shaft 6 is eccentric, meaning that the direction of extension of the pendulum shaft 6 defines a non-zero angle with the direction of extension of the axis X of the motor 9.

Further, the fluid pump 100 may comprise a curved lever 7. The knee lever 7 is located between the runner 5 and the diaphragm body mount 2 in the assembly direction a. The knee lever 7 may comprise a first end 701 facing the wheel 5 and a second end 702 opposite to the first end 701. The second end 702 is oriented toward the diaphragm body mount 2.

A first end 701 of the knee lever 7 is connected to the pendulum shaft 6. For example, a center hole 703 (fig. 4) is provided on the bottom of the knee lever 7, and the center hole 703 is fitted over the swing shaft 6, thereby connecting the knee lever 7 and the swing shaft 6.

The second end 702 of the bell crank 7 is coupled to the diaphragm body 20 to drive the reciprocating compression and pumping movement of the diaphragm unit 21. In particular, the second end 702 of the knee lever 7 may be provided with brackets 71, the number of brackets 71 corresponding to the number of diaphragm units 21. In the embodiment shown in fig. 2, the knee lever 7 comprises 4 brackets 71. The bracket 71 is provided with a through hole at the free end for being sleeved on the mounting handle 212 of the diaphragm unit 21 to drive the diaphragm cavity 211 of the diaphragm unit 21 to compress and suck in a reciprocating manner.

When the micro fluid pump works, the torque output by the motor 9 is transmitted to the rotating wheel 5 to drive the rotating wheel 5 to rotate, the rotation of the rotating wheel 5 drives the curved rod 7 to move through the pendulum shaft 6, and the rotation of the curved rod 7 causes each diaphragm unit 21 of the diaphragm body 20 to alternately compress and suck because the extension line of the pendulum shaft 6 and the axis X define a non-zero included angle. When pumping, fluid enters the interior of the micro fluid pump 100 from the inlet 42, and the inlet valve 31 on the valve seat 3 opens to allow fluid to pass through and into the diaphragm chamber 211 of the diaphragm unit 21. When compressed, the fluid is forced out of the diaphragm cavity 211 and causes the discharge valve 32 to open, discharging out of the micro fluid pump 100 via the outlet 41.

In order to achieve a continuous and stable high pressure fluid output, the micro fluid pump 100 according to the present invention further comprises a support bar 8. The specific arrangement of the support rods will now be described with reference to figures 3 to 8. The partial sectional view of fig. 3 schematically shows the position of the support bar 8 in the assembled state. Fig. 4 schematically shows a perspective view of the main housing 1 as a first housing section of a micro fluid pump according to the invention. Fig. 5 schematically shows a perspective view of the support bar 8 and the knee lever 7 in an assembled state according to an embodiment of the invention. Fig. 6 schematically shows a sectional view of the support bar 8 and the knee lever 7 in an assembled state. Fig. 7 and 8 schematically show an exploded view of the support bar 8 and the knee lever 7, respectively.

According to the invention, in the embodiment shown in fig. 3, the support bar 8 has a substantially flat bar-like shape. The support rods may be made of metal, such as steel. The support bar 8 is fixed relative to the main housing 1 and supports the curved bar 7 in the direction of the axis X. That is, in this embodiment, the first housing section is the main housing 1 and the second housing section is the diaphragm body mount 2, and as shown in fig. 2 and described above, the diaphragm body mount 2 is provided with the diaphragm body 20 having a plurality of (four in this example) diaphragm chambers 211. And, the support rod 8 is fixedly connected to the main housing 1 (i.e. the first housing section) and the diaphragm body mount 2 (i.e. the second housing section) at the interface a thereto. It will be appreciated that in a possible embodiment not shown, the first housing section may be a further housing section than the main housing 1 and/or the second housing section may be a further housing section than the diaphragm body mount 2.

Thereby, most of the high pressure generated in the reciprocating suction and compression movements of the diaphragm unit 21 of the diaphragm body 20 will be transmitted to the main housing via the support rod 8 in the direction of the axis X, and thus supported by the main housing 1, and will not be directly transmitted to a crank, a runner, a series of transmission gears, etc., as in the conventional art. As mentioned above, the parts of the micro pump are subjected to high pressure, which causes premature damage to the parts, thus causing problems such as too short service life of the pump; in the micro fluid pump according to the present invention, the transmission path and the bearing object of the high pressure are changed by the smart setting of the support rod, which not only protects the delicate components of the micro pump so that they can be precisely matched during the long service life, but also significantly improves the pressure of the fluid discharged from the fluid pump, and increases the pressure application range of the fluid pump (for example, extending from previous 1 bar to current 1 to 9 bar, or even higher). In addition, the micro fluid pump according to the present invention retains advantages compared to other high pressure pumps (e.g., cam pump, vane pump, etc.) in the prior art, including low noise, small size, low cost, etc., due to the technology of using the diaphragm pump.

Specifically, referring to fig. 3 and 4, the main housing 1 may be provided with main housing receiving parts 11 and 12 to receive a portion of the support bar 8 along the axis X. These are for example two recesses provided in the upper part of the main housing 1. The main housing receiving parts 11 and 12 may be, for example, grooves formed to be recessed from the upper face 102 of the main housing 1 toward the motor 9 for receiving both end portions of the support rod 8.

Accordingly, the diaphragm body mount 2 may be provided with diaphragm seat receiving portions 23 and 24 corresponding to the main housing receiving portions 11 and 12, respectively, in the direction of the axis X to receive another portion of the support rod 8 along the axis X. As shown in fig. 3, for example, the diaphragm seat receiving portions 23 and 24 may be grooves formed by being recessed from the lower surface 202 of the diaphragm body mount 2 toward the valve seat 3, for receiving both end portions of the support rod 8.

Thus, in the direction of the axis X, the support rod 8 is received by both the main housing 1 and the diaphragm body mount 2. That is, the support rod 8 is engaged with both the main housing 1 and the diaphragm body mount 2, a portion of the height of the support rod 8 in the direction of the axis X coincides with a portion of the height of the main housing 1 in the direction of the axis X, and another portion of the height of the support rod 8 in the direction of the axis X coincides with a portion of the height of the diaphragm body mount 2 in the direction of the axis X.

The above describes an example in which the support rod has a straight shape. It will be appreciated that the support bar may have other forms, for example, an X-shaped, cruciform shaped bracket.

This arrangement of the support rod 8 also makes it possible to avoid relative displacements of the two housing sections to which it is fixed relative to each other, in particular perpendicular to the axis X, while significantly increasing the pressure range of the fluid pump. In the case of a high-pressure pump, the components of the fluid pump are easily deformed due to the high pressure, and the parts which are matched with each other are easily dislocated, so that the pump cannot normally work or even is damaged. According to the utility model discloses a bracing piece among the miniature fluid pump has effectively avoided taking place this kind of condition between two casing sections.

In one embodiment, the main housing receiving portions 11 and 12 receive half of the height of the support bar 8 along the axis X, and the diaphragm seat receiving portions 23 and 24 receive the other half of the height of the support bar 8 along the axis X. Thus, when a lateral force occurs which tends to cause relative displacement of the first and second housing sections, the first and second housing sections will be subjected to substantially equal lateral forces, i.e. the lateral forces are distributed substantially evenly to the two housing sections, avoiding premature failure of one of the housing sections due to unequal distribution of forces.

Further, to provide more stable positioning of the support bar 8 relative to the main housing 1, the support bar 8 may include a positioning feature along axis X with a corresponding main housing positioning feature along axis X in the main housing receiving portion 11. In one example, not shown, the positioning feature of the support rod 8 is a positioning recess facing the main housing 1, and the main housing positioning feature is a main housing positioning projection, the positioning recess engaging with the main housing positioning projection to connect and fix the support rod 8 to the main housing 1.

As shown in fig. 3 to 6, the support rod 8 may have positioning recesses in the form of through holes 811 and 812 at portions near both ends, the main housing 1 may have main housing positioning bosses 111 and 112 in its main housing receiving parts 11 and 12, the diaphragm body mount 2 is provided with diaphragm seat positioning bosses 231 and 241 at corresponding positions, the main housing positioning bosses 111 and 112 and the diaphragm seat positioning bosses 231 and 241 of the main housing 1 protrude into the through holes 811 and 812 from both sides of the support rod 8, respectively, so that the support rod 8 is connected and fixed to both the main housing 1 and the diaphragm body mount 2.

The fluid pump according to the present invention is further described below with reference to fig. 5-8. As shown in fig. 5 and 6, the support lever 8 may be provided with a support boss 81 protruding toward the diaphragm body mount 2, and the curved lever 7 is supported on the support boss 81. In this embodiment, the curved lever 7 comprises a hollow 72, so that the support lever 8 can be arranged in the hollow 72 on a plane transverse to the axis X. For example, the hollow portion 72 is perforated so that the support rod 8 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. Preferably, in this embodiment, the extension line Y (shown in fig. 6) of the support bar 8 is perpendicular to the axis X.

Returning now to fig. 5 and 6. The support boss 81 is provided on the support rod 8, projecting from the support rod 8 toward the diaphragm body mount 2, so that the curved lever 7 is supported on the support boss 81. In particular, the support projection 81 may be spherical, as shown in fig. 6, with the vertex of the ball lying on the axis X of the motor 8. And the portion of the curved lever 7 above the hollow portion 72 is supported on the apex of the supporting projection 81.

Furthermore, in an embodiment not shown, the support protrusions may be tapered, for example conical or polyhedral. In this case, the knee lever 7 is supported on the apex of the cone.

As shown in fig. 7, the support protrusion 81 and the support bar may be separate components, that is, they may be separable. They can be assembled together by fitting the support protrusions 81 tightly to the support rods 8. For example, the support bar 8 may be provided with a support recess 813, for example on the upper face 811 of the support bar 8, in which support recess 813 a support projection 81 in the form of a support sphere is provided, as shown in fig. 6. The outer face of the support sphere may interfit with the inner edge of the support recess 813 so that the support sphere is a tight fit to the support bar 8. When the curved bar 7 moves under the drive of the swing shaft 6, the supporting protrusion 81 supporting the curved bar 7 does not move along with the curved bar 7 due to the tight fit with the supporting bar 8, but is fixed relative to the supporting bar 8.

In an embodiment not shown, the support projection 81 may be formed integrally with the support bar 8, in a single piece.

The material forming the projections may have a variety of options. For example, the bumps may be steel bumps, ceramic bumps, or cemented carbide bumps. So that it is possible to provide strong support for the knee lever 7, withstanding very high operating pressures.

The knee lever 7 of the micro fluid pump 100 according to the present invention will be described with reference to fig. 6 to 8. As shown in fig. 6 and 8, in order to enable the curved lever 7 to be stably supported on the support projection 81, the curved lever 7 is provided at its side facing the support projection 81 with a curved lever recess 73 that is engaged with the support projection 81. Thereby, the support projection 81 is located between the support bar 8 and the curved bar recess 73. For example, in the case where the support protrusion 81 is separated from the support bar 8, the support protrusion 81 may be sandwiched between the support recess 813 of the support bar 8 and the curved bar recess 73. The knee lever recess 73 is configured to cooperate with the support projection 81 in such a way that it can move unimpeded over the support projection 81. For example, when the support protrusion 81 is spherical, the radius of curvature of the curved lever recess 73 is larger than that of the support protrusion 81, so that the curved lever 7 can be supported on the support lever 8 without being hindered from moving during the operation of the micro fluid pump.

Further, the knee lever 7 may further comprise an insert 74 (fig. 7), in which case the knee lever recess 73 may be provided on this insert 74. Specifically, in the example shown in fig. 7 and 8, the insert 74 may have an intermediate section 741, and branch sections 742 and 743 extending from both ends of the intermediate section 741. The intermediate section 741 may have an elongated shape, in which a portion expanding in a direction transverse to the direction of elongation thereof may be provided in the middle, so that both sufficient space is provided for the provision of the knee lever recess 73 cooperating with the support projection 81 and sufficient structural strength of the insert is ensured. The knee lever recess 73 may be provided in the lower face of the expansion portion, i.e. the face facing the first end 701 of the knee lever 7. The branch sections 742 and 743 may extend parallel to each other towards the first end 701 of the knee lever 7. The insert 74 may be made of a metallic material, such as steel, thereby forming a rigid support with the boss 81.

In a preferred example, the insert 74 is embedded in the body of the curved rod 7 by overmoulding. The insert 74 thus constitutes a reinforcement of the knee lever 7 itself, which also increases the overall structural strength of the knee lever 7.

Further, for assembly, the main housing 1 is provided with axial assembly holes 13A, 13B, 13C, and 13D, as shown in fig. 3 and 4. A pump assembly bolt 43 is disposed within each axial assembly bore 13A, 13B, 13C and 13D. Specifically, in the embodiment shown in fig. 4, axial assembly holes 13A, 13B, 13C, and 13D through which the pump assembly bolts 43 extend may be provided at substantially middle positions of the respective rims of the main casing 1. Referring to fig. 4, at two opposite edges of the main housing 1 for receiving the support rod 8, the main housing receiving part 11 may be disposed adjacent to the axis line assembling hole 13A, and the main housing receiving part 12 may be disposed adjacent to the axis line assembling hole 13C. Such an arrangement provides that the support bar and the fixed and reinforcing pump assembly bolts are disposed in substantially the same plane defined by the axis X and the extension Y of the support bar 8, thereby enhancing the overall strength of the pump and enabling further assurance that relative displacement between adjacent housing sections is avoided.

In a preferred embodiment, referring to fig. 3 and 7, the ends of the support rod 8 may be arranged to partially surround the axial assembly holes 13A and 13C. For example, the ends of the support bar 8 may be provided with grooves 801 and 802, which are, for example, semicircular shaped grooves. The grooves 801 and 802 are recessed from the distal edge of the support bar 8 toward the middle of the support bar 8. The grooves 801 and 802 may partially surround the axial assembly holes 13A and 13C, and therefore, when assembled, the grooves 801 and 802 at the ends of the support rod 8 also partially surround the pump assembly bolts 43. Thereby, the support bar 8 and the pump assembly bolt 43 at least partially overlap in a direction perpendicular to the plane defined by the axis X and the extension line Y, constituting a multiple strengthening structure, better stabilizing the interconnection between adjacent casing sections and thus better avoiding relative displacements therebetween.

It is to be understood that the structures described above and shown in the attached drawings are merely examples of the present invention, which can be replaced by other structures exhibiting the same or similar function for obtaining the desired end result. Furthermore, it should be understood that the embodiments described above and shown in the drawings are to be regarded as only constituting non-limiting examples of the present invention and that it can be modified in a number of ways within the scope of the patent claims.

Claims (14)

1. A micro fluid pump, the fluid pump comprising:

a motor having a motor shaft extending along an axis;

a first housing section connected to the motor and defining an accommodation space;

a second housing section abutting and connected to the first housing section;

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

a crank lever having a first end coupled to the pendulum shaft and a second end opposite the first end coupled to the diaphragm body to drive reciprocating compression and suction motions of a diaphragm chamber of the diaphragm body;

characterized in that the fluid pump further comprises a support bar fixed with respect to the first housing section and supporting the curved bar in the direction of the axis;

and wherein the support bar is fixedly connected to the first housing section and the second housing section at their interface.

2. The micro fluid pump of claim 1, wherein the first housing section is a main housing and the second housing section is a diaphragm body mount having a diaphragm body with a plurality of diaphragm chambers disposed thereon.

3. The micro fluid pump as claimed in claim 2, wherein the main housing is provided with a main housing receiving portion to receive a portion of the support rod along the axis, and the diaphragm body mount is provided with a diaphragm seat receiving portion corresponding to the main housing receiving portion in an axial direction to receive another portion of the support rod along the axis.

4. The micro-fluid pump of claim 3, wherein the main housing receiving portion receives one half of the height of the support rod along the axis, and the diaphragm seat receiving portion receives the other half of the height of the support rod along the axis.

5. The micro fluid pump of claim 3 or 4, wherein the support rod includes a locating feature along the axis, the main housing receiver having a corresponding main housing locating feature along the axis.

6. The micro fluid pump of claim 5, wherein the locating feature is a locating recess facing the main housing and the main housing locating feature is a main housing locating protrusion.

7. The micro fluid pump of claim 6, wherein the positioning recess is a through hole and the diaphragm body mount includes a corresponding diaphragm seat positioning boss.

8. The micro fluid pump according to claim 3 or 4, wherein the main housing is provided with an axial assembly hole in which a pump assembly bolt is disposed, and wherein the main housing receiving portion is disposed adjacent to the axial assembly hole.

9. The micro fluid pump of claim 8, wherein an end of the support rod partially surrounds the axial assembly hole.

10. The micro fluid pump according to any one of claims 1 to 4, wherein the support rod has a straight shape or an X-shape.

11. The micro fluid pump according to any one of claims 1 to 4, wherein the support rod is provided with a support recess in which a support ball is disposed.

12. A pressure fluid application apparatus, characterized in that it comprises a micro fluid pump according to any of claims 1 to 11.

13. The apparatus of claim 12, wherein the pressurized fluid application device is a coffee maker.

14. The apparatus of claim 12, wherein said pressurized fluid application device is a household dental prophylaxis device.

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