Miniature vacuum pump

Abstract

The utility model relates to a kind of micro fluid pumps, especially a kind of micro vacuum pump, including pump shell, pumping component installed in the inside of pump shell and drive motor of transmission connection pumping component, pump shell is formed with the vacuum extraction port for fluid inflow and at least one exhaust port for fluid outflow, pumping component or / and pump shell is formed with pump cavity, vacuum extraction port, pump cavity and at least one exhaust port are sequentially fluidly connected and form a fluid path, pump shell further includes pressure stabilizing chamber on the fluid path, at least one exhaust valve seat adjacent to pressure stabilizing chamber and exhaust valve installed on exhaust valve seat, exhaust port is formed on exhaust valve seat and fluidly connected pressure stabilizing chamber, exhaust valve is closed at least one exhaust port when natural state.Effect of certain pressure stabilization is had to fluid by exhaust valve and pressure stabilizing chamber.Under the action of the effect of certain pressure stabilization, the vibration amplitude of sound wave carried by fluid is reduced, so that noise decibel is reduced and whistle sound can be well eliminated.

Description

Technical Field

[0001] This utility model relates to the field of microfluidic pump technology, and in particular to a micro vacuum pump. Background Technology

[0002] A miniature vacuum pump generally includes a pump casing, a pumping component installed within the casing, a drive motor providing power, and a transmission mechanism that connects the drive motor and the pumping component. The pumping component and / or the pump casing form a pump chamber. The pump casing typically has a vacuum port and an exhaust port, which are sequentially fluid-connected, forming a fluid path for fluid flow. Currently, miniature vacuum pumps are noisy during operation and often accompanied by a sharp whistling sound, resulting in a poor user experience. This has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0003] The purpose of this invention is to provide a miniature vacuum pump with lower noise.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a miniature vacuum pump, comprising a pump housing, a pumping component installed inside the pump housing, and a drive motor connected to the pumping component. The pump housing has a vacuum port for fluid inflow and at least one exhaust port for fluid outflow. The pumping component and / or the pump housing form a pump chamber. The vacuum port, the pump chamber, and the at least one exhaust port are sequentially fluidly connected and form a fluid path. The pump housing also includes a pressure stabilizing chamber located on the fluid path, at least one exhaust valve seat adjacent to the pressure stabilizing chamber, and an exhaust valve installed on the exhaust valve seat. The exhaust port is formed on the exhaust valve seat and is fluidly connected to the pressure stabilizing chamber. The exhaust valve closes the at least one exhaust port in its natural state.

[0005] In the above technical solution, preferably, the pump casing includes an upper cover, a valve seat, a diaphragm seat, and a base arranged sequentially along the axial direction, the pumping component is installed on the diaphragm seat, and the vacuum port is formed on the upper cover.

[0006] In the above preferred embodiment, it is further preferred that the valve seat is provided with an air inlet channel, and the vacuum port, the air inlet channel and the pump chamber are in sequential fluid communication.

[0007] In the above preferred embodiment, more preferably, the base includes a base body and a cover detachably mounted on the bottom of the base body, the pressure stabilizing cavity is formed by the base body and the cover, and at least one exhaust valve seat is formed on the cover.

[0008] In the above preferred embodiment, more preferably, the drive motor is installed on the lower side of the base, and the upper end face of the drive motor and the lower end face of the base have at least a partial clearance fit to form a gap, and when the exhaust valve is opened, at least one exhaust port is fluidly connected to the gap.

[0009] In the preferred embodiment described above, more preferably, the valve seat and the diaphragm seat each have at least one axially penetrating first through hole and at least one second through hole, and the pump chamber, the at least one first through hole, the at least one second through hole, and the pressure stabilizing chamber are sequentially fluidly connected. Even more preferably, the pump housing includes a plurality of axially extending fixing bolts, the fixing bolts passing through the first through hole and the second through hole, and the inner walls of both the first through hole and the second through hole forming a clearance fit with the fixing bolts.

[0010] In the preferred embodiment described above, and further preferably, the base and the diaphragm seat together form a transmission cavity distinct from the pressure stabilizing cavity. The micro vacuum pump further includes a transmission mechanism that enables the drive motor to drive the pumping component, and the transmission mechanism is disposed within the transmission cavity. Even more preferably, the vacuum port is in fluid communication with the transmission cavity.

[0011] Compared to existing technologies, the micro vacuum pump provided by this invention requires the fluid to overcome the opening pressure of the exhaust valve when leaving the pump body. This allows the exhaust valve and pressure-stabilizing chamber to stabilize the fluid pressure. Under this pressure-stabilizing effect, the vibration amplitude of the sound waves carried by the fluid is reduced, thus lowering the noise level and effectively eliminating sharp whistling sounds. Attached Figure Description

[0012] Figure 1 A perspective view of the miniature vacuum pump provided by this utility model;

[0013] Figure 2 for Figure 1 The explosion diagram of the miniature vacuum pump is shown.

[0014] Figure 3 for Figure 1 A top view of the miniature vacuum pump shown;

[0015] Figure 4 for Figure 3 The micro vacuum pump shown is a cross-sectional view along the AA direction;

[0016] Figure 5 for Figure 3 The micro vacuum pump shown is a cross-sectional view along the BB direction;

[0017] Figure 6for Figure 5 A magnified view of a portion at point C shown.

[0018] Marked in the image:

[0019] 100. Miniature vacuum pump;

[0020] 1. Pump casing; 11. Vacuum port; 12. Exhaust port; 13. Pressure stabilizing chamber; 14. Exhaust valve seat; 15. Exhaust valve; 151. Rod; 152. Umbrella; 16. Top cover; 17. Valve seat; 171. Inlet passage; 172. First through hole; 18. Diaphragm seat; 181. Second through hole; 19. Base; 191. Base body; 192. Cover; 110. Transmission chamber;

[0021] 2. Pumping components; 21. Pump chamber;

[0022] 3. Drive motor; 31. Output shaft;

[0023] 4. Valve plate; 41. Inlet valve; 42. Outlet valve;

[0024] 5. Tighten the bolts;

[0025] 61. Cam; 62. Drive rod; 63. Drive disc. Detailed Implementation

[0026] To explain in detail the technical content, structural features, achieved objectives and effects of this application, the technical solutions in the embodiments of this application will be described below with reference to the accompanying drawings.

[0027] In this application, spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side” (e.g., as in a “sidewall”) are used to describe the relationship between one element and another (other) element as shown in the accompanying drawings. Spatial relative terms are intended to include different orientations of the device in use, operation, and / or manufacture other than those depicted in the drawings. For example, if the device in the drawings is flipped, an element described as “below” or “under” another element or feature would then be positioned “above” said other element or feature. Thus, the exemplary term “below” can include both above and below orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0028] In this application, the term "axial" refers to the direction in which the axis of the miniature vacuum pump points.

[0029] This invention provides a miniature vacuum pump designed to reduce the noise generated during operation, especially the harsh whistling sound. Specifically, as shown... Figure 1-2 The present invention provides an embodiment of a micro vacuum pump 100, which includes a pump housing 1, a pumping component 2 for pumping fluid, a drive motor 3 for providing power to the pumping component 2, and a transmission mechanism for realizing the transmission connection between the pumping component 2 and the drive motor 3.

[0030] Combination Figure 5-6 The pump casing 1 has a vacuum port 11 for fluid to flow into the pump body and an exhaust port 12 for fluid to leave the pump body. The pumping component 2 and the pump casing 1 together form a pump chamber 21. The vacuum port 11, the pump chamber 21, and the exhaust port 12 are sequentially fluid-connected and form a fluid path for fluid flow. When the micro vacuum pump 100 is working, the air port or external pipe of the object being evacuated is connected to the vacuum port 11, and the drive motor 3 drives the pumping component 2 to move. Under the pumping of the pumping component 2, the fluid flows from the vacuum port 11 to the exhaust port 12 through the fluid path, thereby creating a negative pressure at the vacuum port 11.

[0031] During the aforementioned operation, the noise generated by the pumping component 2 of the micro vacuum pump 100 and fluid compression will be transmitted through the fluid path in the form of sound waves and ultimately propagate to the outside of the pump body from the exhaust port 12. Therefore, this invention provides a pressure stabilizing chamber 13 inside the pump body 1, several exhaust valve seats 14 adjacent to the pressure stabilizing chamber 13, and several exhaust valves 15 respectively installed on each exhaust valve seat 14. The exhaust port 12 is formed on the aforementioned exhaust valve seat 14.

[0032] After the fluid carrying the sound wave reaches the pressure stabilizing chamber 13, it needs to overcome the opening pressure of the exhaust valve 15 before it can be discharged from the pump body. That is, the pressure stabilizing chamber 13 and the exhaust valve 15 have a pressure stabilizing effect on the fluid. Under the effect of this pressure stabilization, the vibration amplitude of the sound wave carried by the fluid is reduced, producing an effect similar to a "muffled sound." Therefore, the pressure stabilizing chamber 13 and the exhaust valve 15 can effectively reduce noise levels and effectively eliminate sharp whistling sounds. It is understood that the noise reduction effect of the pressure stabilizing chamber 13 and the exhaust valve 15 is not limited by the specific type of the miniature vacuum pump 100 (such as a centrifugal pump or a plunger pump). Therefore, the type of miniature vacuum pump does not limit the scope of protection of this application.

[0033] See Figure 2-4The miniature vacuum pump 100 provided in this embodiment is a diaphragm pump. Its pump housing 1 includes an upper cover 16, a valve seat 17, a diaphragm seat 18, and a base 19 arranged sequentially along the axial direction. A vacuum port 11 is formed on the upper cover 16 and exposed to the outside. A pumping component 2 is mounted on the diaphragm seat 18, and the pump chamber 21 is formed by the pumping component 2 and the valve seat 17. An air inlet channel 171 is provided on the valve seat 17, and the vacuum port 11, the air inlet channel 171, and the pump chamber 21 are in sequential fluid communication. A valve plate 4 is held between the valve seat 17 and the upper cover 16, and a plurality of air inlet valves 41 and air outlet valves 42 are integrated on the valve plate 4. The air inlet valves 41 are disposed between the air inlet channel 171 and the pump chamber 21, and the air outlet valves 42 are disposed between the pump chamber 21 and the first through hole 172 (see below) to limit the unidirectional flow of fluid.

[0034] The base 19 includes a base body 191 with an open bottom and a cover 192 detachably mounted to the bottom of the base body 191. The base body 191 includes a connecting portion with a plurality of threaded holes located at the top, an exposed outer wall, and an annular partition located on the inner side. The connecting portion, outer wall, and annular partition together form an annular groove with an open bottom, and the cover 192 closes the bottom opening of the annular groove, thereby forming a pressure stabilizing chamber 13. The exhaust valve seat 14 is formed by a portion of the cover 192 recessed into the pressure stabilizing chamber 13.

[0035] The valve seat 17 and the diaphragm seat 18 are respectively provided with a plurality of axially penetrating first through holes 172 and second through holes 181. The pump chamber 21, the first through holes 172, the second through holes 181 and the pressure stabilizing chamber 13 are sequentially and three-dimensionally connected. The base 19 is provided with a plurality of axially extending vent holes (not shown in the figure), and the second through holes 181 are fluidly connected to the pressure stabilizing chamber 13 through the aforementioned vent holes.

[0036] Furthermore, the various components on the pump housing 1 are fixedly connected by a number of locking bolts 5. The locking bolts 5 pass through the first and second through holes, and the inner walls of the first and second through holes are clearance-fitted with the locking bolts 5. The fluid leaving the pump chamber 21 flows to the pressure stabilizing chamber 13 through the gap between the inner walls and the locking bolts 5.

[0037] like Figure 6 The exhaust valve 15 used in this application is an umbrella valve. This umbrella valve includes a rod portion 151 fixedly mounted on the exhaust valve seat 14 and an umbrella portion 152 fixedly connected to the rod portion 151. When the exhaust valve 15 is in its natural state, its umbrella portion 152 closes the corresponding exhaust port 12. In other embodiments, the exhaust valve may also be a reed valve, a ball valve, a diaphragm valve, etc.

[0038] The drive motor 3 is fixedly mounted on the lower side of the base 17. The upper end face of the drive motor 3 is clearance-fitted with the lower end face of the base 17, forming a gap (not marked in the figure). When the exhaust valve 15 is opened, this gap is in fluid communication with the exhaust port 12, and the fluid flowing out of the exhaust port 12 flows out of the pump body through the aforementioned gap.

[0039] The connecting part of the base 17, the annular partition, and the diaphragm seat 18 together enclose the transmission cavity 110 located on the lower side of the pumping component 2. The drive motor 3 has an output shaft 31 that extends into the transmission cavity 110. The transmission mechanism is disposed in the transmission cavity 110 and includes a cam 61 fixedly mounted on the output shaft 31, a transmission rod 62 mounted on the cam 61, and a drive disk 63 mounted on the top of the transmission rod 62. The bottom of the pumping component 2 is fixedly mounted on the drive disk 63 and can be moved by the drive disk 63.

[0040] Furthermore, the vacuum port 11 is fluidly connected to the transmission cavity 110. Through the expansion effect of the larger transmission cavity 110, the suction noise of the micro vacuum pump 100 can be reduced to a certain extent.

[0041] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be construed as limiting the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit of this application should be included within the scope of protection of this application.

Claims

1. A miniature vacuum pump, comprising a pump housing, a pumping component installed inside the pump housing, and a drive motor drively connected to the pumping component, wherein the pump housing has a vacuum port for fluid inflow and at least one exhaust port for fluid outflow, the pumping component and / or the pump housing form a pump chamber, and the vacuum port, the pump chamber, and the at least one exhaust port are sequentially fluid-connected and form a fluid path, characterized in that, The pump housing further includes a pressure stabilizing chamber located on the fluid path, at least one exhaust valve seat adjacent to the pressure stabilizing chamber, and an exhaust valve installed on the exhaust valve seat. The exhaust port is formed on the exhaust valve seat and is in fluid communication with the pressure stabilizing chamber. The exhaust valve closes the at least one exhaust port in its natural state.

2. The miniature vacuum pump according to claim 1, characterized in that, The pump casing includes an upper cover, a valve seat, a diaphragm seat, and a base arranged sequentially along the axial direction. The pumping component is mounted on the diaphragm seat, and the vacuum port is formed on the upper cover.

3. The miniature vacuum pump according to claim 2, characterized in that, The valve seat is provided with an air inlet channel, and the vacuum port, the air inlet channel and the pump chamber are in sequential fluid communication.

4. The miniature vacuum pump according to claim 2, characterized in that, The base includes a base body and a cover detachably mounted on the bottom of the base body. The pressure stabilizing chamber is formed by the base body and the cover. At least one exhaust valve seat is formed on the cover.

5. The miniature vacuum pump according to claim 4, characterized in that, The drive motor is mounted on the lower side of the base, and the upper end face of the drive motor and the lower end face of the base have at least a partial clearance fit to form a gap. When the exhaust valve is opened, at least one exhaust port is fluidly connected to the gap.

6. The miniature vacuum pump according to claim 4, characterized in that, The valve seat and the diaphragm seat are respectively formed with at least one first through hole and at least one second through hole that are axially connected, and the pump chamber, the at least one first through hole, the at least one second through hole and the pressure stabilizing chamber are in sequential fluid communication.

7. The miniature vacuum pump according to claim 6, characterized in that, The pump housing includes a plurality of axially extending fixing bolts, which pass through the first through hole and the second through hole. The inner walls of the first through hole and the second through hole are both clearance-fitted with the fixing bolts.

8. The miniature vacuum pump according to claim 2, characterized in that, The base and the diaphragm seat together form a transmission cavity that is different from the pressure stabilizing cavity. The micro vacuum pump also includes a transmission mechanism that enables the drive motor to drive the pumping component. The transmission mechanism is disposed in the transmission cavity.

9. The miniature vacuum pump according to claim 8, characterized in that, The vacuum port is in fluid communication with the transmission cavity.

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