Pump body and micro fluid pump

Abstract

The application relates to a pump body comprising a pump shell, an eccentric wheel and a connecting rod. The pump shell is provided with a first gas passage. The eccentric wheel has a spiral locking groove arranged around its rotation axis. One end of the connecting rod is movably arranged in the locking groove, and the connecting rod is configured to follow the rotation of the eccentric wheel so that the other end of the connecting rod is in abutment or separation with the first gas passage. By adopting the technical scheme, the eccentric wheel rotates forward or reversely around its rotation axis under the driving of a driving device, and drives the connecting rod to slide to a relatively high or low position of the spiral locking groove. When the connecting rod is located at the relatively low position in the locking groove, the connecting rod is separated from the first gas passage of the pump shell, so that the function of exhaust pressure relief is realized; when the connecting rod is located at the relatively high position in the locking groove, the connecting rod is in abutment with the first gas passage, so that the gas is prevented from flowing out of the first gas passage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid pumps, in particular to a pump body and a micro fluid pump. BACKGROUND

[0002] With the continuous progress of fluid pump technology, in order to meet the needs of the market, fluid pumps gradually develop towards miniaturization, thus a series of micro fluid pumps appear.

[0003] Part of the micro fluid pump can realize bidirectional delivery of medium. Taking a micro air pump as an example, by driving the motor to rotate forward or reverse, both inflation function and air extraction function can be realized.

[0004] However, when the driving motor stops working, the current micro fluid pump can only be additionally provided with a control valve to avoid fluid leakage, so as to maintain the airtightness of the micro fluid pump and the working chamber.

[0005] Chinese patent CN109268236A discloses a micro air pump, which comprises a pump shell provided with a gas chamber, the gas chamber is communicated with a gas storage container through an air inlet channel, the pump shell is further provided with an air outlet channel communicated with the gas chamber, a first check valve is arranged in the air inlet channel, and a second check valve is arranged in the air outlet channel; a leather cup is installed in the gas chamber; a driving mechanism is used for extending into the gas chamber from the other end of the gas chamber and being fixedly connected with the leather cup to drive the leather cup to periodically move back and forth in the gas chamber; and an electromagnetic valve is installed on the pump shell, the air inlet end of the electromagnetic valve is communicated with the atmosphere; a flow channel is further arranged on the pump shell and communicated with the air outlet end of the electromagnetic valve, and the flow channel is further communicated with the air inlet channel between the first check valve and the gas storage container. The driving mechanism drives the leather cup to realize the functions of air suction and exhaust of the gas storage container, when the driving mechanism stops working, the atmosphere is filled into the gas storage container by opening the electromagnetic valve and sequentially passing through the electromagnetic valve, the flow channel and the air inlet channel. SUMMARY

[0006] Therefore, it is necessary to provide a pump body which can realize automatic pressure maintenance when the driving device stops and has a more simplified structure.

[0007] A pump body comprises a pump shell, an eccentric wheel and a connecting rod. The pump shell is provided with a first gas channel. The eccentric wheel has a spiral locking groove arranged around its rotation axis. One end of the connecting rod is movably arranged in the locking groove, and the connecting rod is configured to follow the rotation of the eccentric wheel, so that the other end of the connecting rod is in abutment or separation with the first gas channel.

[0008] By adopting the technical scheme, the eccentric wheel rotates around its rotation axis in a positive direction or a reverse direction under the driving of the driving device, and drives the connecting rod to slide to a relatively high position or a relatively low position in the spiral locking groove. When the connecting rod is located at the relatively low position in the locking groove, the connecting rod is separated from the first gas passage of the pump shell, so that the function of exhaust pressure relief is realized. When the connecting rod is located at the relatively high position in the locking groove, the connecting rod abuts against the first gas passage, so that the gas is prevented from flowing out of the first gas passage.

[0009] In one of the embodiments, a valve core is sleeved on one end of the connecting rod which is relatively close to the first gas passage, and the valve core is configured to be capable of opening or closing the first gas passage by following the rotation of the connecting rod.

[0010] By adopting the technical scheme, the valve core is sleeved on the connecting rod, and the valve core can be separately processed and formed, so that the shape of the valve core is better adapted to the first gas passage, and the effect of sealing the first gas passage is improved.

[0011] In one of the embodiments, a concave arc-shaped universal groove is arranged on the valve core which is relatively close to one end of the connecting rod, and the connecting rod is rotatably connected in the universal groove.

[0012] By adopting the technical scheme, the concave arc-shaped universal groove in the valve core is used to connect the connecting rod, so that when the valve core abuts against the first gas passage in the axial direction, the connecting rod can still rotate in the circumferential direction to realize other functions.

[0013] In one of the embodiments, the locking groove is arranged along a cylindrical spiral line, and a normal projection of the positioning part spiral line along the rotation axis direction is an open arc curve.

[0014] By adopting the technical scheme, when the connecting rod slides in the locking groove, the shortest distance between the bottom end of the connecting rod and the rotation axis is always equal, so that the connecting rod and the rotation axis have the same inclination angle, so that the connecting rod has the same rotation efficiency, and at the same time, when the connecting rod is located at both ends of the locking groove, the positions of the connecting rod in the axial direction are different although the inclination angles are the same, so that the first gas passage is opened or closed.

[0015] In one of the embodiments, the non-return structure is a groove, and one end of the connecting rod which is relatively close to the locking groove is clamped in the groove. One end of the connecting rod (300) which is relatively close to the locking groove (210) is clamped in the groove (211A).

[0016] By adopting the technical scheme, the relatively high part of the locking groove is provided with the check structure, when the driving device stops working, the connecting rod is still clamped in the check structure and cannot slide downward along the spiral locking groove, so that the connecting rod always abuts against the first gas passage to keep the air tightness in the pump body and the communicated working chamber unless the driving device reversely rotates. Only part of one end of the connecting rod is clamped in the groove, so that when the driving device stops working, the support force and the friction force provided by the inner wall of the groove to the connecting rod are enough to balance the gravity of the connecting rod, thereby preventing the connecting rod from sliding along the spiral locking groove from the relatively high part to the relatively low part under the action of gravity. On the other hand, when the driving device reversely rotates, the pressure applied by the inner wall of the locking groove to the connecting rod is enough to make the connecting rod overcome the support force and the friction force of the inner wall of the groove to the connecting rod, so that the connecting rod is disengaged from the groove and slides from the relatively high part to the relatively low part.

[0017] In one of the embodiments, the locking groove is formed along a spiral line and has two ends, and the groove is arranged at the end of the locking groove.

[0018] In one of the embodiments, the eccentric wheel is provided with a guide platform around the rotation axis, and the side wall of the guide platform is arranged to be inclined to the rotation axis.

[0019] By adopting the technical scheme, the side wall of the guide platform abuts against part of the connecting rod to provide the support force to the connecting rod and ensure that the connecting rod is placed at a specific inclined angle, so that the friction force obtained by the connecting rod from the side wall of the guide platform based on the pressure is enough to overcome the friction force of the connecting rod moving in the locking groove, thereby enabling the connecting rod to move along the locking groove from the relatively low part to the relatively high part when the driving device works.

[0020] In one of the embodiments, the guide platform extends to form an abutting part, and the side wall of the abutting part is arranged to be inclined to the rotation axis.

[0021] By adopting the technical scheme, the abutting part is used to limit the connecting rod, when the connecting rod is at the two ends of the locking groove, the side wall of the guide platform and the abutting part abut against the connecting rod at the same time to ensure that the connecting rod is in the same plane as the rotation axis, thereby avoiding that the connecting rod is broken due to the inconsistent force and internal stress.

[0022] The application also provides a micro fluid pump, which comprises the pump body, the driving device connected to the pump body, and the pump cover arranged at the end of the pump body far away from the driving device, the pump cover is provided with a plurality of exhaust passages and exhaust holes, and the exhaust passages are communicated with the first gas passage and the exhaust holes.

[0023] By adopting the technical scheme, the pump cover is provided with multiple exhaust passages and exhaust holes, when the first gas passage is opened, the gas is dispersed into the multiple exhaust passages from the first gas passage, so that the gas is branched, the gas pressure and the gas flow rate of each exhaust passage are reduced, and the noise generated in the exhaust pressure relief process is reduced.

[0024] In one of the embodiments, the micro fluid pump further comprises a diaphragm fixing seat arranged in the pump shell, characterized in that the diaphragm fixing seat is provided with a second gas passage, and the diaphragm fixing seat and the pump cover are formed with a third gas passage and a fourth gas passage in the axial direction of the rotation axis, and the first gas passage, the exhaust passage, the third gas passage, the second gas passage, the fourth gas passage and the exhaust hole are sequentially communicated.

[0025] By adopting the technical scheme, in the exhaust pressure relief process, the gas flows into the horizontally arranged exhaust passage in the pump cover from the vertically arranged first gas passage, then flows into the horizontally arranged second gas passage in the diaphragm fixing seat through the vertically arranged third gas passage, and finally flows to the exhaust hole along the vertically arranged fourth gas passage, and is discharged to the outside from the exhaust hole, the multiple gas passages are sequentially arranged in different directions to form a three-dimensional gas path, the path of the gas flow is prolonged, a certain buffer space is provided, the pressure and the gas flow rate of the gas at the exhaust hole are reduced, and the noise generated in the exhaust pressure relief process is further reduced.

[0026] The micro fluid pump provided by the embodiments of the present application has at least one of the following beneficial technical effects:

[0027] 1. A mechanical cooperation structure of the eccentric wheel and the connecting rod is provided, so that the pressure maintaining function under the stop working of the driving device can be realized without the help of the electromagnetic valve.

[0028] 2. The universal groove with concave arc shape is arranged in the valve core, so that when the valve core is abutted to the first gas passage in the axial direction, the connecting rod can still rotate in the circumferential direction to realize other functions.

[0029] 3. The complex three-dimensional gas path is formed between the pump cover and the diaphragm fixing seat to prolong the path of the gas flow, provide the gas buffer space, reduce the pressure and the gas flow rate of the gas at the exhaust hole, and reduce the noise generated in the exhaust pressure relief process. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a cross-sectional structure schematic view of the pump body 10 in the embodiment of the present application;

[0031] Figure 2 It is a structure explosion schematic view of the micro fluid pump from the first perspective in the embodiment of the present application;

[0032] Figure 3 Structure diagram of the second perspective of the diaphragm fixing seat in an embodiment of the present application;

[0033] Figure 4A Structure diagram of the first perspective of the connecting rod in an embodiment of the present application;

[0034] Figure 4B Sectional view diagram of the connecting rod and the valve core after assembly in an embodiment of the present application;

[0035] Figure 5A Structure diagram of the first perspective of the valve core in an embodiment of the present application;

[0036] Figure 5B Sectional view diagram of the valve core in an embodiment of the present application;

[0037] Figure 6A Structure diagram of the first perspective of the eccentric wheel in an embodiment of the present application;

[0038] Figure 6B Sectional view diagram of the eccentric wheel in an embodiment of the present application;

[0039] Figure 6C Structure diagram of the second perspective of the eccentric wheel in an embodiment of the present application;

[0040] Figure 7A Gas flow direction diagram when the pump body is inhaling in an embodiment of the present application;

[0041] Figure 7B Structure diagram of the first perspective of the pump body in an embodiment of the present application; Figure 7A Enlarged structure diagram of the structure at A in

[0042] Figure 8A Gas flow direction diagram when the pump body is exhaling in an embodiment of the present application;

[0043] Figure 8B Enlarged structure diagram of the structure at B in Figure 8A

[0044] Structure diagram of the second perspective of the pump cover in an embodiment of the present application; Figure 9

[0045] Structure exploded diagram of the first perspective of the micro fluid pump in an embodiment of the present application; Figure 10

[0046] Structure diagram of the second perspective of the pump cover in an embodiment of the present application; Figure 11

[0047] Figure 12 ​Figure 1 is a schematic view of a gas flow in a first perspective of a pump cover and a valve fixing seat according to an embodiment of the present application.

[0048] Reference signs:

[0049] 10, pump body; 20, pump cover; 30, driving device; 100, pump shell; 110, first gas passage; 120, fifth gas passage; 200, eccentric wheel; 201, outer peripheral wall; 210, locking groove; 211, check structure; 211A, groove; 220, guide platform; 221, abutting portion; 300, connecting rod; 310, valve core; 311, universal groove; 312, positioning portion; 313, annular protrusion; 320, balance wheel; 321, capsule; 322, one-way valve; 330, matching portion; 400, diaphragm fixing seat; 410, pressure relief hole; 520, second gas passage; 430, diaphragm; 130, exhaust passage; 131, exhaust hole; 132, exhaust groove; 133, extension; 140, third gas passage; 150, fourth gas passage; 500, valve fixing seat; 501, through hole; 600, driving motor; 610, output shaft; 620, motor fixing seat; 621, soundproof baffle. DETAILED DESCRIPTION

[0050] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the scope of the present application, and it is understood that similar modifications can be made by those skilled in the art in the light of the teachings of the present application, so the present application is not limited to the following specific embodiments.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] In addition, the terms "first", "second", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second" can explicitly or implicitly include at least one of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0055] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes, and are not the only embodiment.

[0056] Please refer to Figure 1 , Figure 1A cross-sectional structure schematic diagram of the pump body 10 in an embodiment of the present application is shown. The pump body 10 provided by the embodiment of the present application includes a pump shell 100, an eccentric wheel 200, and a connecting rod 300. The pump shell 100 is provided with a first gas passage 110 for gas circulation. The eccentric wheel 200 is arranged in the pump shell 100, one side of which is used for transmission connection with a driving device 30 outside to rotate, and the other side is provided with a spiral locking groove 210 around the rotation axis. The connecting rod 300 is movably arranged in the locking groove 210, one end of the connecting rod 300 moves along the spiral locking groove 210, so that the connecting rod 300 moves upward or downward in the axial direction of the eccentric wheel 200 (hereinafter referred to as the axial direction), so that the other end of the connecting rod 300 abuts against or separates from the first gas passage 110. The check structure 211 arranged on the locking groove 210 is used to keep the connecting rod 300 abutting against the first gas passage 110 to prevent gas leakage when the eccentric wheel 200 stops rotating.

[0057] It should be noted that in the embodiment, the forward direction is the clockwise direction, and the reverse direction is the counterclockwise direction. In other embodiments, those skilled in the art can set the rotation direction of the spiral line according to actual needs, so as to determine that the forward direction of the eccentric wheel 200 is clockwise or counterclockwise.

[0058] It can be understood that although the gas is taken as an example for description in the embodiment of the present application, those skilled in the art can replace the gas with a liquid having fluidity according to actual needs, and the device in the embodiment of the present application can still play the same role, so that the simple replacement of the application medium should be considered within the scope protected by the present application.

[0059] The pump shell 100 is provided with the first gas passage 110 and a fifth gas passage 120, the first gas passage 110 is communicated with a working chamber (not shown), and the fifth gas passage 120 is directly communicated with the outside atmosphere. When the driving device 30 drives the eccentric wheel 200 to rotate in the forward direction, the gas outside is sucked into the pump shell 100 from the fifth gas passage 120, and is pumped into the first gas passage 110 along the gas filling path in the pump shell 100, and is filled into the working chamber from the first gas passage 110. When the driving device 30 drives the eccentric wheel 200 to rotate in the reverse direction, the gas filling path in the pump shell 100 is cut off, and the gas exhaust path is communicated. At this time, if the pressure in the working chamber is greater than the pressure of the outside gas, the gas in the working chamber enters the gas exhaust path in the pump shell 100 in the reverse direction along the first gas passage 110.

[0060] Please refer to Figure 1 and Figure 2 , Figure 2This is a first-view exploded structural diagram of a micro fluid pump according to an embodiment of this application. A diaphragm holder 400 is also provided inside the pump housing 100 for fixing the diaphragm 430. Specifically, the diaphragm holder 400 is also provided with a pressure relief hole 410, which is connected to the end of the first gas passage 110 that is relatively far from the working chamber. The pressure relief hole is located on the exhaust gas path. The pressure relief hole 410 is controlled by the connecting rod 300 to open or close the exhaust gas path. When the connecting rod 300 moves axially to press against the pressure relief hole 410, the exhaust gas path is thus cut off to charge or maintain pressure in the working chamber. When the connecting rod 300 moves axially to separate from the pressure relief hole 410, the exhaust gas path is restored, thereby achieving exhaust pressure relief.

[0061] Please refer to the following: Figure 3 , Figure 3 This is a second-view structural schematic diagram of the diaphragm holder 400 in one embodiment of this application. Specifically, in this embodiment, the diaphragm holder 400 has a circular structure, with three diaphragms 430 evenly spaced along the circumferential direction on the diaphragm holder 400. This allows the multiple diaphragms 430 to pump gas into the first gas channel 110 in a pulsed manner with the same frequency and capacity. The pressure relief hole 410 is located at the center of the diaphragm holder 400, between the three circular diaphragms 430, thereby maximizing the utilization of the surface area of ​​the diaphragm holder 400 and providing sufficient working space for the diaphragms 430, thus improving the working efficiency of the fluid pump.

[0062] It should be noted that the structure of the diaphragm fixing seat 400, diaphragm 430 and pressure relief hole 410 is not limited to that described in the embodiments of this application. Those skilled in the art can perform adaptive adjustments based on actual needs, such as adjusting the number of diaphragms 430, adjusting the diameter and position of the pressure relief hole 410.

[0063] Please refer to the following: Figure 4A , Figure 4A This is a first-view structural schematic diagram of the connecting rod 300 in one embodiment of this application. A bladder 321 is movably connected within the diaphragm 430, and the bladder 321 is capable of elastic deformation to pump gas into the diaphragm 430. Specifically, the bladder 321 is disposed on a balance wheel 320, which is sleeved on the connecting rod 300. When the connecting rod 300 performs a conical pendulum motion around its axis, the balance wheel 320 sleeved on the upper part of the connecting rod 300 follows the rotation of the connecting rod 300, causing the bladder 321 on the balance wheel 320 to move and deform in the vertical direction. A one-way valve 322 is provided at the end of the bladder 321 closest to the diaphragm 430, such that when the bladder 321 is compressed, the one-way valve 322 closes to inflate the diaphragm 430, and when the bladder 321 is stretched, the one-way valve 322 opens to replenish gas into the bladder 321.

[0064] More specifically, the movement track, working principle and structural arrangement of the capsule 321 on the balance wheel 320 are well known to those skilled in the art, and the pump gas process itself is not the focus of the present application, and will not be described here.

[0065] It should be noted that, since the movement of the connecting rod 300 is a conical swing track around the rotation axis, the connecting rod 300 itself does not produce rotation, and therefore the balance wheel 320 and the capsule 321 on the balance wheel 320 also do not produce rotation, and the capsule 321 corresponds to the same diaphragm 430 throughout.

[0066] It should also be noted that, in the present embodiment, the connecting rod 300 is preferably a metal member to provide sufficient rigidity and material strength. The capsule 321 which can be elastically deformed is preferably a plastic member to balance the material cost and material performance. In some other embodiments, the connecting rod 300, the balance wheel 320 and the capsule 321 are processed by injection molding and are integrally formed to optimize the processing procedure and reduce the processing cost.

[0067] Please refer to Figure 4B , Figure 4B is a cross-sectional view of the connecting rod 300 and the valve core 310 after assembly in an embodiment of the present application. The connecting rod 300 is arranged between the eccentric wheel 200 and the diaphragm fixing seat 400. Specifically, the connecting rod 300 is provided with the valve core 310 at one end close to the pressure relief hole 410, and the valve core 310 is used to seal the pressure relief hole 410. The valve core 310 is provided with a sealing structure on the side close to the pressure relief hole 410, which cooperates with the shape and size of the pressure relief hole 410 to improve the sealing performance of the valve core 310. When the connecting rod 300 moves in the axial direction towards the pressure relief hole 410, the sealing structure on the valve core 310 abuts against the pressure relief hole 410 to achieve sealing; when the connecting rod 300 moves in the axial direction away from the pressure relief hole 410, the valve core 310 leaves the pressure relief hole 410 to allow gas to flow in the pressure relief hole 410.

[0068] In some embodiments, the middle part of the connecting rod 300 is provided with a matching part 330, which is specifically an annular groove 211A arranged on the surface of the connecting rod 300, and the groove 211A is used to assemble with the balance wheel 320 to further improve the connection stability between the connecting rod 300 and the balance wheel 320, while reducing the friction between the connecting rod 300 and the eccentric wheel 200 and reducing the noise generated by the rotating movement of the connecting rod 300.

[0069] Please refer to Figure 5A and Figure 5B , Figure 5A is a structural schematic view of the valve core 310 from the first perspective in an embodiment of the present application, Figure 5BFigure 6 is a cross-sectional view of the valve core 310 according to an embodiment of the present application. In this embodiment, the sealing structure includes a positioning portion 312 and an annular protrusion 313 disposed on the side of the positioning portion 312 away from the pressure relief hole 410. The area of the annular protrusion 313 is greater than the area of the pressure relief hole 410, so as to completely cover the pressure relief hole 410 and prevent gas from flowing through the pressure relief hole 410. The side wall of the annular protrusion 313 is provided as a bevel, so that the annular protrusion 313 has a certain amount of deformation accommodation, so that part of the annular protrusion 313 can fill the inside of the pressure relief hole 410, and has a certain amount of error accommodation, so as to prevent the gas tightness from being reduced due to assembly errors or wear errors.

[0070] The positioning portion 312 on the valve core 310 is mainly used for guiding and pre-positioning. When the valve core 310 is separated from the pressure relief hole 410, the annular protrusion 313 is completely out of the pressure relief hole 410, and the positioning portion 312 has a certain length, so when the connecting rod 300 moves away from the direction of the pressure relief hole 410, the positioning portion 312 is still located in the pressure relief hole 410, so that when the valve core 310 moves towards the pressure relief hole 410 again, the positioning portion 312 plays a role in pre-positioning and guiding the movement of the valve core 310. It can be understood that the cross-sectional area of the positioning portion 312 is smaller than the hole diameter of the pressure relief hole 410, so that when the positioning portion 312 is located in the pressure relief hole 410, it does not affect the flow of gas from the pressure relief hole 410.

[0071] The side of the valve core 310 away from the pressure relief hole 410 is rotatably connected to the connecting rod 300. Specifically, the side of the valve core 310 close to the connecting rod 300 is provided with a concave arc-shaped universal groove 311, and the end of the connecting rod 300 connected to the universal groove 311 is correspondingly provided as a circular arc, so that the end of the connecting rod 300 is clamped in the universal groove 311, and when the valve core 310 is pressed against the pressure relief hole 410 by the pressure applied by the inner wall of the universal groove 311, the connecting rod 300 can still rotate relatively in a plane perpendicular to the axial direction, realizing the pumping function. Moreover, the cooperation between the concave arc-shaped universal groove 311 and the circular arc-shaped end of the connecting rod 300 is relatively smooth, which can reduce the wear between the end of the connecting rod 300 and the universal groove 311, and improve the service life of the parts.

[0072] It needs to be emphasized again that the movement of the connecting rod 300 is a conical pendulum trajectory around the rotation axis, although in this embodiment the rotation axis passes through the end of the connecting rod 300, but the connecting rod 300 always performs a conical pendulum movement around the rotation axis of the eccentric wheel 200, rather than a rotational movement around the axis of the connecting rod 300 itself.

[0073] Please refer to Figure 6A , Figure 6AFigure 1 is a schematic structural diagram of a first perspective view of an eccentric wheel 200 according to an embodiment of the present application. A lower end of a connecting rod 300 is movably arranged in a locking groove 210 of the eccentric wheel 200. Specifically, the eccentric wheel 200 includes an outer peripheral wall 201 arranged at an outer edge of the eccentric wheel 200 and a guide platform 220 arranged around a rotation axis, and the outer peripheral wall 201 and the guide platform 220 jointly form the locking groove 210. The locking groove 210 is arranged along a spiral line, and the locking groove 210 is arranged in a spiral around the rotation axis of the eccentric wheel 200. The spiral locking groove 210 has a relatively high end and a relatively low end.

[0074] Figure 2 is a schematic structural diagram of a second perspective view of the eccentric wheel 200 according to the embodiment of the present application. Figure 6B , Figure 6B Figure 3 is a schematic structural diagram of a cross-sectional view of the eccentric wheel 200 according to the embodiment of the present application. The guide platform 220 is arranged at a certain angle of inclination with respect to the rotation axis, so that part of the connecting rod 300 abuts against the inclined side wall of the guide platform 220. Thus, the angle of inclination between the side wall of the guide platform 220 and the rotation axis defines the angle of inclination between the connecting rod 300 and the rotation axis when the connecting rod 300 moves on the spiral locking groove 210 and moves along a conical trajectory at the end of the locking groove 210. In the embodiment, the angle of inclination is preferably designed to be 10° to 16°.

[0075] The locking groove 210 is designed as a single spiral structure, and the pitch of the spiral is preferably designed to be 0.2 mm to 2 mm in the embodiment to match the axial depth of the pressure relief hole 410. The locking groove 210 forms two ends along the spiral line, and the included angle between the two ends is preferably 20° to 330° in the embodiment.

[0076] Specifically, in the embodiment, the width of the locking groove 210 in the radial direction is slightly larger than the diameter of the connecting rod 300, so that the connecting rod 300 can be tilted at a certain angle and is just clamped in the locking groove 210, without shaking in the radial direction to hit the outer peripheral wall or the side wall of the guide platform 220.

[0077] Figure 4 is a schematic structural diagram of a third perspective view of the eccentric wheel 200 according to the embodiment of the present application. Figure 6C , Figure 6C Figure 5 is a schematic structural diagram of a fourth perspective view of the eccentric wheel 200 according to the embodiment of the present application. The two end portions of the locking groove 210 are away from one side of the included angle, and the guide platform 220 extends to form an abutting portion 221, and the side wall of the abutting portion 221 is arranged to be inclined toward the rotation axis. When the connecting rod 300 is located at the end portions of the two ends of the locking groove 210, the connecting rod 300 rotates synchronously with the eccentric wheel 200, and at this time, the connecting rod 300 abuts against the side wall of the guide platform 220 in the radial direction of the eccentric wheel 200 and abuts against the side wall of the extended portion in the circumferential direction of the eccentric wheel 200, so that the connecting rod 300 is limited in both directions at the same time, which ensures that the connecting rod 300 is located in the same plane as the rotation axis, avoids the connecting rod 300 from shaking in the locking groove 210 to affect the transmission efficiency, or the connecting rod 300 from being broken due to inconsistent forces at different positions.

[0078] The end of the locking groove 210 on the side of the relatively high position is provided with a check structure 211 for limiting the sliding of the connecting rod 300. In the embodiment, the check structure 211 is a groove 211A with a circular-arc groove surface. When one end of the connecting rod 300 is clamped in the groove 211A, the connecting rod 300 is located in the spiral locking groove 210 as a whole, and the connecting rod 300 is subjected to the gravity component force that slides along the locking groove 210 towards the relatively low position. Thus, the connecting rod 300 has a tendency to move out of the groove 211A, and the inner wall of the groove 211A exerts a pressure on the connecting rod 300 to prevent the connecting rod 300 from moving out of the groove 211A. The component force of the pressure on the moving track of the connecting rod 300 is opposite to the gravity component force, and the size is comparable. Therefore, the connecting rod 300 is static in the groove 211A without external force. When the eccentric wheel 200 rotates reversely, the groove 211A of the eccentric wheel 200 rotates accordingly, and exerts a pressure on the connecting rod 300 in the same direction as the gravity component force, breaks the force balance state of the connecting rod 300, and forces the connecting rod 300 to slide out of the groove 211A.

[0079] The circular-arc groove surface of the groove 211A can reduce the friction force between the connecting rod 300 and the groove surface, so that the force balance state can be broken quickly when the eccentric wheel 200 rotates, and the response time of the connecting rod 300 following the rotation of the eccentric wheel 200 is improved. The circular-arc groove surface of the groove 211A can also make the connecting rod 300 regarded as a rigid body smoothly move out of the groove 211A, reduce the rigid collision, and increase the service life of the connecting rod 300 and the eccentric wheel 200.

[0080] It should be noted that the check structure 211 can be a mechanical blocking piece such as a baffle or a protrusion, or can be in the form of a magnet or adhesive, and can adsorb the connecting rod 300 to prevent sliding. As long as the connecting rod 300 can be prevented from sliding along the locking groove 210 under the action of gravity, and the connecting rod 300 can be separated from the limitation to follow the rotation of the eccentric wheel 200 when the eccentric wheel 200 rotates.

[0081] The working principle of the pump body 10 in the embodiment is as follows: Figure 7A and Figure 7B , Figure 7A is the gas flow direction diagram when the pump body 10 inhales in the embodiment of the application, Figure 7B is Figure 7AFigure 6 is an enlarged view of the structure at A in Figure 5. When the eccentric wheel 200 rotates in the forward direction, the eccentric wheel 200 moves relative to the connecting rod 300, so that the end of the connecting rod 300 in contact with the locking groove 210 moves from the relatively low position in the locking groove 210 to the relatively high position, until the connecting rod 300 abuts the inner wall of the port on the side of the relatively high position of the locking groove 210, at which time the connecting rod 300 rotates along the conical pendulum trajectory together with the eccentric wheel 200. At this time, the connecting rod 300 is always located at the relatively high position of the locking groove 210, so as to keep the valve core 310 on the connecting rod 300 abutting against the pressure relief hole 410 to prevent gas leakage, and at the same time, the balance wheel 320 on the connecting rod 300 rotates along the rotation axis, so that the capsule 321 normally works to inflate.

[0082] Figure 7 is a schematic view of the gas flow path when the pump body 10 is in the process of discharging gas in an embodiment of the present application. Figure 8A Figure 8 is an enlarged view of the structure at B in Figure 7. Figure 8B Figure 8A Figure 9 is a schematic view of the gas flow path when the pump body 10 is in the process of discharging gas in an embodiment of the present application. Figure 8B Figure 10 is an enlarged view of the structure at B in Figure 9. Figure 8A Figure 11 is an enlarged view of the structure at B in Figure 9.

[0083] Figure 12 is a schematic view of the gas flow path when the pump body 10 is in the process of discharging gas in an embodiment of the present application. Figure 7A Figure 13 is an enlarged view of the structure at B in Figure 12. Figure 7B When the eccentric wheel 200 changes from forward rotation to stop rotating, the fifth gas passage 120 no longer takes in gas, but the part of the end of the connecting rod 300 is clamped in the check structure 211 provided at the relatively high position of the locking groove 210, thereby preventing the connecting rod 300 from sliding downward to the relatively low position along the spiral locking groove 210 under the action of gravity, so that the valve core 310 keeps abutting against the pressure relief hole 410 to prevent gas from overflowing from the first gas passage 110 through the pressure relief hole 410 in the working chamber when the eccentric wheel 200 stops rotating.

[0084] It should be noted that, since the one-way valve 322 provided on the capsule 321 only allows gas to be input from the capsule 321 to the diaphragm 430 and the first gas passage, therefore, the gas in the first gas passage 110 cannot be directly discharged in reverse from the gas inlet flow path during the pressure relief process.

[0085] The present application also provides a micro fluid pump, comprising the pump body 10 and the driving device 30 connected with the pump body 10. ​

[0086] In the embodiment, the driving device 30 is a driving motor 600, and an output shaft 610 of the driving motor 600 is sleeved on the other side of the eccentric wheel 200 opposite to the connecting rod 300. The output shaft 610 of the driving motor 600 is arranged at the center of the eccentric wheel 200 to define the rotation axis of the eccentric wheel 200. The output shaft 610 of the driving motor 600 can rotate in a forward direction or a reverse direction, thereby determining the rotation direction of the eccentric wheel 200 connected to the output shaft 610.

[0087] In one embodiment, the driving motor 600 is connected to the pump body 10 through a motor fixing seat 620, and a soundproof baffle 621 is arranged around the motor output shaft 610 in the motor fixing seat 620 to reduce the noise generated by the rotation of the motor output shaft 610.

[0088] Please refer to Figure 9 , Figure 9 FIG. 6 is a structural schematic view of a second perspective of the pump cover 20 in an embodiment of the present application. The pump cover 20 is arranged on the pump body 10, and a plurality of exhaust passages 130 and exhaust holes 131 are arranged in the pump cover 20. The exhaust passages 130 are connected to the first gas passage 110. Specifically, the plurality of exhaust passages 130 are arranged at equal intervals in the radial direction in the pump cover 20. One end of the exhaust passage 130 is located at the center of the pump cover 20 and is connected to the other end of the first gas passage 110 opposite to the pressure relief hole 410, and the other end is connected to the exhaust hole 131 to exhaust the gas. The plurality of exhaust passages 130 collectively receive the gas flowing out of the first gas passage 110 to reduce the pressure at each exhaust hole 131.

[0089] The other end of the exhaust passage 130 close to the exhaust hole 131 is further provided with an exhaust groove 132 for forming a buffer space for the gas in the gas path. Specifically, the groove wall of the exhaust groove 132 opposite to the side away from the outer edge of the pump cover 20 is configured as a concave circular arc shape to adapt to the shape of the pump in the pump cover 20. On the one hand, the circular arc-shaped groove wall can guide the gas in the first gas passage 110 to gradually change to another direction perpendicular to the curve of the groove wall; on the other hand, the shape of the groove wall is consistent with the shape of the pump in the pump cover 20, which can maximize the use of the area in the pump cover 20, increase the volume of the exhaust groove 132, so that the exhaust groove 132 can accommodate more gas and improve the buffering capacity of the exhaust groove 132.

[0090] The bolt connecting block (not shown in the figure) is provided in the exhaust groove 132, opposite sides of the bolt connecting block are provided with exhaust holes 131, the exhaust holes 131 on the two sides are oppositely arranged to prolong the gas flow path in the exhaust groove 132. Specifically, the exhaust holes 131 are arranged along the circumferential direction of the pump cover 20 to define two gas paths in the exhaust groove 132. Since the exhaust holes 131 are arranged in the circumferential direction in the pump cover 20, and the exhaust passage 130 is arranged in the radial direction in the pump cover 20, the gas path directions of the two are perpendicular, so that when the gas enters the exhaust holes 131 from the exhaust passage 130, the gas flow rate is reduced due to the change of moving direction and the loss of kinetic energy caused by collision with the inner wall of the exhaust groove 132, so that the gas in the exhaust holes 131 reduces friction and reduces noise generated.

[0091] Referring to Figure 10 and Figure 11 , Figure 10 is a structural explosion schematic view of a first perspective of a micro fluid pump in an embodiment of the present application, Figure 11 is a structural schematic view of a second perspective of a pump cover in an embodiment of the present application. In another embodiment of the present application, the three exhaust passages 130 extend in the circumferential direction to form an extension 133 relative to one end close to the outer edge of the pump cover 20, and the extension 133 is provided with a through hole facing the diaphragm fixing seat 400 relative to one end away from the exhaust passage 130, to form a third gas passage 140 in the axial direction (i.e. vertical direction).

[0092] Referring to Figure 12 , Figure 12 is a gas flow schematic view of a first perspective of the pump cover 20 and the valve fixing seat 500 in an embodiment of the present application. The valve fixing seat 500 is provided with a corresponding through hole 501 to allow the third gas passage 140 to partially pass through the valve fixing seat 500. The valve fixing seat 500 is provided with a second gas passage 520 in the horizontal direction relative to the side away from the pump cover 20, one end of the second gas passage 520 communicates with the third gas passage 140, and the other end of the second gas passage 520 is also provided with a through hole 501 to form a fourth gas passage 150 in the vertical direction. The fourth gas passage 150 directly communicates with the exhaust hole 131 relative to one end away from the third gas passage 140.

[0093] In this scheme, the first gas passage 110, the exhaust passage 130, the third gas passage 140, the second gas passage 520, the fourth gas passage 150 and the exhaust hole 131 are sequentially communicated, and the gas path is sequentially arranged as vertical direction passage and horizontal direction passage, thereby forming a three-dimensional gas path, prolonging the gas flow path, providing a certain buffer space, thereby reducing the pressure and gas flow rate of the gas at the exhaust hole 131, further reducing the noise generated during the exhaust pressure relief.

[0094] The working principle of the micro fluid pump in the embodiments of the present application is as follows: by increasing the length of the air path, or by setting a bending air path to make the air flow turn, or by setting a buffer cavity to buffer the air flow, or by setting multiple exhaust passages 130 to divide the flow, in short, to reduce the kinetic energy of the air flow, to reduce the movement speed of the air flow at the exhaust hole 131, to reduce the air friction thus generated, and thus to reduce the noise during exhaust.

[0095] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not contradict, they should be considered within the scope of the present disclosure.

[0096] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A pump body, characterized by, The application relates to a pump, which comprises a pump shell (100) provided with a first gas channel (110), an eccentric wheel (200) provided with a spiral locking groove (210) around a rotation axis of the eccentric wheel (200), and a connecting rod (300) provided with one end movably arranged in the locking groove (210), the connecting rod (300) being configured to follow forward rotation or reverse rotation of the eccentric wheel (200), the pump shell (100) is further provided with a diaphragm fixing seat (400) for fixing a diaphragm (430), the diaphragm fixing seat (400) is further provided with a pressure relief hole (410) communicated with one end of the first gas channel (110) away from a working chamber, one end of the connecting rod (300) close to the pressure relief hole (410) is provided with a valve core (310), the valve core (310) is configured to open or close the pressure relief hole (410) following rotation of the connecting rod (300), one end of the valve core (310) close to the connecting rod (300) is provided with a universal groove (311), the connecting rod (300) is rotatably connected in the universal groove (311), the locking groove (210) is arranged along a cylindrical spiral line, a normal projection of the cylindrical spiral line along the rotation axis direction is an open circular arc curve, and the locking groove (210) is provided with a check structure (211) at a relatively high position along the rotation axis direction. The check structure (211) is a groove (211A), and one end of the connecting rod (300) close to the locking groove (210) can be clamped in the groove (211A).

2. The pump body of claim 1, wherein The eccentric wheel (200) is provided with a guide table (220) around the rotation axis, and a side wall of the guide table (220) is obliquely arranged relative to the rotation axis.

3. The pump body of claim 1, wherein The guide table (220) is provided with an abutting part (221) extending, and a side wall of the abutting part (221) is obliquely arranged towards the rotation axis.

4. The pump body of claim 3, wherein, The pump shell (100) comprises a pump cover (20), the pump cover (20) is provided with at least one exhaust channel (130) and an exhaust hole (131), and the exhaust channel (130) is communicated with the first gas channel (110) and the exhaust hole (131).

5. A micro fluid pump comprising a pump body (10) according to any one of claims 1 to 4 and a drive device (30) connected to the pump body (10), characterized in that ​

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