CN212928084U - Miniature metering pump - Google Patents

Abstract

The application discloses miniature measuring pump, including the box, with box tip fixed connection's pump head, setting are in the diaphragm of box tip is in with being used for driving the diaphragm is close to and keeps away from the drive arrangement of pump head, drive arrangement including with diaphragm fixed connection's push rod, be used for driving the push rod is close to and keeps away from the eccentric mechanism of pump head is with being used for the drive eccentric mechanism pivoted AC synchronous machine, AC synchronous machine is located in the box, just eccentric mechanism with AC synchronous machine's output shaft transmission is connected. The alternating current synchronous motor is positioned in the box body, the volume is small, the structure is simple, the cost is low, the service life is long, and quantitative liquid output can be achieved by changing the rotating speed of the alternating current synchronous motor and the eccentric distance of the eccentric mechanism. The alternating current synchronous motor is used for driving to replace the electromagnet, so that the problems of short service life and high cost of a driving mechanism of the conventional metering pump are solved.

Description

Miniature metering pump

Technical Field

The application relates to the technical field of metering pumps, in particular to a miniature metering pump.

Background

The metering pump has the advantages of accurate and adjustable delivery amount and the like, and is ideal equipment for precisely metering and adding the fluid. Nowadays, the method is widely applied to a plurality of fields of pharmaceutical industry, food and beverage industry and petrochemical industry, and is responsible for metering and adding strong corrosive, toxic, high-viscosity and high-pressure media in the technical process. At present, in the metering pump industry, a miniature metering pump is driven by an electromagnet, and the electromagnet needs a control panel to provide power and control for the miniature metering pump, so that the whole machine has a complex structure and high cost.

Therefore, how to solve the problems of short service life and high cost of the driving mechanism of the existing metering pump is a key technical problem to be solved by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

For overcoming the problem that exists among the correlation technique at least to a certain extent, the utility model aims at providing a miniature measuring pump, it utilizes the drive of interchange synchronous machine, replaces the electro-magnet drive, can solve the actuating mechanism life and or the problem with high costs of current measuring pump.

The application provides a miniature measuring pump, including the box, with box tip fixed connection's pump head, setting are in the diaphragm of box tip is in with being used for driving the diaphragm is close to and keeps away from the drive arrangement of pump head, drive arrangement including with diaphragm fixed connection's push rod, be used for driving the push rod is close to and keeps away from the eccentric mechanism of pump head is with being used for the drive eccentric mechanism pivoted AC synchronous machine, AC synchronous machine is located in the box, just eccentric mechanism with AC synchronous machine's output shaft transmission is connected.

Preferably, the eccentric mechanism comprises an eccentric shaft and an eccentric bearing used for contacting with the push rod, the eccentric shaft comprises a first part coaxially connected with an output shaft of the alternating current synchronous motor and a second part used for driving the eccentric bearing to move, the first part is connected with the second part, the eccentric bearing is sleeved outside the second part, and the axes of the first part and the second part are not on the same straight line.

Preferably, the eccentric shaft further comprises a third part, the third part is coaxial with the first part and is connected with the top end of the second part, supporting bearings are sleeved outside the first part and the third part, and outer rings of the two supporting bearings are fixedly connected with the box body.

Preferably, the push rod includes a first rod portion connected to the diaphragm and a second rod portion connected to an end of the first rod portion away from the pump head, the second rod portion is provided with an inner cavity, the eccentric bearing is located in the inner cavity, and the eccentric bearing can contact with the inner cavity close to the side wall of the pump head.

Preferably, the driving device further comprises a return spring for driving the push rod to return, one end of the return spring is connected to the box body, the other end of the return spring is connected to the push rod, and when the push rod is stressed to be close to the pump head, the return spring is extruded to deform; when the stress of the push rod disappears, the return spring recovers deformation and drives the push rod to be far away from the pump head.

Preferably, the box is including the shell with be located inner shell in the shell, the diaphragm is located the tip of shell, the push rod with reset spring all is located in the inner shell, the reset spring cover is established outside the push rod, just reset spring is close to the one end of pump head with the inner shell is connected, is kept away from the one end of pump head with the push rod is connected.

Preferably, the stroke adjusting mechanism comprises a stroke adjusting rod, an adjusting knob and a limiting device, wherein the stroke adjusting rod is located in the box body, the adjusting knob is used for driving the stroke adjusting rod to move, the limiting device is used for limiting the stroke adjusting rod to rotate, one end of the stroke adjusting rod is fixedly connected with the adjusting knob, the other end of the stroke adjusting rod extends into the inner shell and can abut against the push rod, the adjusting knob is rotatably arranged on the box cover and can drive the stroke adjusting rod to move back and forth, and the limiting device is sleeved outside the stroke adjusting rod and is fixedly connected with the box cover.

Preferably, the outer wall of the second part is provided with a limit protrusion for limiting the axial displacement of the eccentric bearing.

Preferably, the output shaft of the ac synchronous motor is a semi-cylindrical structure, the first portion is provided with a semi-cylindrical groove into which the output shaft of the ac synchronous motor extends, and the output shaft of the ac synchronous motor is matched with the semi-cylindrical groove.

Preferably, the first, second and third portions are of unitary construction.

The technical scheme provided by the application can comprise the following beneficial effects:

the application provides a miniature measuring pump, including box, pump head, diaphragm and drive arrangement, the tip fixed connection of pump head and box, the diaphragm setting is at the tip of box to form the stock solution storehouse between diaphragm and the pump head, drive arrangement is used for driving the diaphragm and is close to and keeps away from the pump head, so that the liquid outflow or the inflow in the stock solution storehouse. The driving device comprises a push rod, an eccentric mechanism and an alternating current synchronous motor, wherein the push rod is arranged in the box body and fixedly connected with the diaphragm to drive the diaphragm to be close to or away from the pump head, the eccentric mechanism is in transmission connection with an output shaft of the alternating current synchronous motor to enable the alternating current synchronous motor to drive the eccentric mechanism to rotate, the eccentric mechanism can be in contact with the push rod to be used for driving the push rod to be close to the pump head, so that the diaphragm is close to the pump head, and liquid in the liquid storage bin flows out of the pump head. The alternating current synchronous motor is positioned in the box body, the volume is small, the structure is simple, the cost is low, the service life is long, and quantitative liquid output can be achieved by changing the rotating speed of the alternating current synchronous motor and the eccentric distance of the eccentric mechanism. Moreover, the membrane is driven to move by the alternating current synchronous motor, and the service life is long compared with that of the membrane driven by a direct current motor; compared with the driving by using a brushless motor, the motor is beneficial to saving cost and can improve the durability of products.

So set up, utilize the synchronous machine drive of interchange, the drive of replacement electro-magnet has solved the short or with high costs problem of actuating mechanism life of current measuring pump.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of the present micro-metering pump, according to some exemplary embodiments.

In the figure:

1. a box cover; 2. a housing; 3. an inner shell; 4. a pump head; 5. a push rod; 6. a membrane; 7. an eccentric shaft; 8. a return spring; 9. an AC synchronous motor; 10. an output shaft; 11. an eccentric bearing; 12. a support bearing; 13. a stroke adjusting rod; 14. adjusting a knob; 15. a stroke fixing disc; 16. a stroke adjusting disk; 17. compressing the spring.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

Referring to fig. 1, the present embodiment provides a micro metering pump, which includes a box, a pump head 4, a diaphragm 6 and a driving device, wherein the pump head 4 is fixedly connected to an end of the box, the diaphragm 6 is disposed at an end of the box, a liquid storage chamber is formed between the diaphragm 6 and the pump head 4, and the driving device is configured to drive the diaphragm 6 to be close to and away from the pump head 4, so as to enable liquid in the liquid storage chamber to flow out or into the liquid storage chamber.

The driving device comprises a push rod 5, an eccentric mechanism and an alternating current synchronous motor 9, wherein the push rod 5 is arranged in the box body and fixedly connected with the diaphragm 6 so as to drive the diaphragm 6 to be close to or far away from the pump head 4, namely, the diaphragm 6 is driven to reciprocate back and forth. The eccentric mechanism is in transmission connection with an output shaft 10 of the alternating current synchronous motor 9, so that the alternating current synchronous motor 9 drives the eccentric mechanism to rotate, the eccentric mechanism can be in contact with the push rod 5 to drive the push rod 5 to be close to the pump head 4, the diaphragm 6 is close to the pump head 4, and liquid in the liquid storage bin flows out of the pump head 4.

Here, the alternating current synchronous motor 9 is located in the box body, the size is small, the structure is simple, the cost is low, the service life is long, and quantitative liquid output can be achieved by changing the rotating speed of the alternating current synchronous motor 9 and the eccentricity of the eccentric mechanism. Moreover, the membrane 6 is driven to move by the AC synchronous motor 9, and the service life is long compared with that of the membrane driven by a DC motor; compared with the driving by using a brushless motor, the motor is beneficial to saving cost and can improve the durability of products.

So set up, utilize the drive of 9 synchronous machines of interchange, the drive of replacement electro-magnet has solved the short and with high costs problem of actuating mechanism life of current measuring pump.

In this embodiment, the eccentric mechanism includes an eccentric shaft 7 and an eccentric bearing 11, the eccentric shaft 7 includes a first portion and a second portion, the first portion is coaxially connected with an output shaft 10 of the ac synchronous motor 9, the second portion is connected with the first portion, the axis of the second portion is not collinear with the axis of the first portion, that is, the second portion is an eccentric portion, the eccentric bearing 11 is sleeved outside the second portion, and an outer ring of the eccentric bearing 11 can contact with the push rod 5, when the ac synchronous motor 9 drives the eccentric shaft 7 to rotate, the second portion eccentrically rotates to drive the eccentric bearing 11 to eccentrically rotate, and when the outer ring of the eccentric bearing 11 contacts with the push rod 5, the push rod 5 is pushed to move forward, that is, the push rod 5 is pushed to approach the pump head 4, thereby realizing forward movement of the diaphragm 6 and enabling the liquid in the liquid storage tank to flow out.

It should be noted that, a limiting protrusion for limiting the axial displacement of the eccentric bearing 11 is arranged on the outer wall of the second portion, the limiting protrusion may be an annular structure sleeved outside the second portion, and the annular structure may be an integral structure with the second portion, specifically, the limiting protrusion may be arranged above the eccentric bearing 11 and may abut against the upper end of the inner ring of the eccentric bearing 11, so as to limit the eccentric bearing 11 and the second portion to slide relatively.

Wherein, the output shaft 10 of AC synchronous motor 9 can be the semicylinder structure, and the first portion is provided with the semicylinder groove to supply AC synchronous motor 9's output shaft 10 to stretch into, and AC synchronous motor 9's output shaft 10 matches with the semicylinder groove, and can closely cooperate, like this, AC synchronous motor 9's output shaft 10 realizes the transmission with eccentric shaft 7 and is connected, thereby can drive eccentric shaft 7 and rotate, and avoided AC synchronous motor 9's output shaft 10 and eccentric shaft 7 slippage.

The eccentric shaft 7 further comprises a third part, which is arranged coaxially with the first part and is connected with the top end of the second part, in particular, the first part, the second part and the third part are in an integrated structure, which is beneficial to improving the stability of the eccentric shaft 7.

In order to improve the rotating stability of the eccentric shaft 7 and avoid the deviation of the eccentric shaft 7, the first part and the third part are respectively provided with a supporting bearing 12, and the outer rings of the two supporting bearings are fixedly connected with the box body, so that the two supporting bearings can support the eccentric shaft 7, and the stability of the eccentric shaft 7 is improved.

Preferably, the driving device further comprises a return spring 8 for driving the push rod 5 to return, one end of the return spring 8 is connected to the box body, and the other end of the return spring 8 is connected to the push rod 5. When the push rod 5 is pushed by the eccentric bearing 11 to move towards the pump head 4, the return spring 8 is extruded by the push rod 5 to deform; when the eccentric bearing 11 does not extrude the push rod 5 any more, the thrust borne by the push rod 5 disappears, the return spring 8 recovers deformation, the push rod 5 is pushed to be far away from the pump head 4, and the return spring returns to the initial position, so that the push rod is pushed next time.

In other embodiments, the push rod 5 comprises a first rod portion and a second rod portion, the first rod portion is connected with the diaphragm 6, and specifically, the first rod portion and the diaphragm 6 can be connected through threads. The second pole portion is connected with the one end that pump head 4 was kept away from to first pole portion, and the second pole portion is provided with the inner chamber, and eccentric shaft 7 stretches into the inner chamber to eccentric bearing 11 is located the inner chamber, and eccentric bearing 11 can be close to the lateral wall contact of pump head 4 with the inner chamber, in order to promote push rod 5 to move to pump head 4.

It should be noted that the second rod portion is provided with a through hole for the eccentric shaft 7 to extend into the inner cavity, the through hole is communicated with the inner cavity, and the eccentric shaft 7 is in clearance fit with the through hole to prevent the side wall of the through hole from blocking the rotation of the eccentric shaft 7.

Here, the width of second pole portion is greater than the width of first pole portion, and reset spring 8 can overlap and establish outside first pole portion to the one end that pump head 4 was kept away from to reset spring 8 can be connected with second pole portion, and the one end that pump head 4 was kept away from to reset spring 8 also can support on one of second pole portion is close to pump head 4, and when second pole portion was promoted by eccentric bearing 11, second pole portion extrusion reset spring 8 made reset spring 8 take place to warp.

In some embodiments, the case comprises an outer shell 2 and an inner shell 3 located inside the outer shell 2, the diaphragm 6 is located at an end of the outer shell 2, the pump head 4 is connected to an end of the outer shell 2, an end of the inner shell 3 close to the pump head 4 is fixedly connected to an inner side of an end of the outer shell 2, the push rod 5 and the return spring 8 are both located inside the inner shell 3, an end of the return spring 8 close to the pump head 4 is fixedly connected to the inner shell 3, and an end of the return spring away from the pump head 4 is connected to the second rod portion of the. Like this, when push rod 5 removed to pump head 4, be convenient for extrude reset spring 8, make reset spring 8 take place deformation to be convenient for drive push rod 5 and reply initial position.

In this embodiment, this miniature measuring pump is still including stroke adjustment mechanism, stroke adjustment mechanism is including stroke adjustment pole 13, adjust knob 14 and be used for restricting stroke adjustment pole 13 pivoted stop device, stroke adjustment pole 13 is located the box, the box is still including the case lid 1 that is connected with shell 2, adjust knob 14 rotationally sets up on case lid 1, and the one end of stroke adjustment pole 13 stretches into in the inner shell 3 can offset with push rod 5, with the stroke length of restriction push rod 5, the other end and the adjust knob 14 fixed connection of stroke adjustment pole 13, it can drive stroke adjustment pole 13 back-and-forth movement to rotate adjust knob 14, thereby the realization is to the regulation of 5 stroke length of push rod.

The limiting device is sleeved outside the stroke adjusting rod 13 and is fixedly connected with the box cover 1 to limit the stroke adjusting rod 13 to rotate, so that the position of the stroke adjusting rod 13 can be prevented from being deviated due to separation caused by impact of the push rod 5.

Stop device is including stroke fixed disk 15, stroke adjusting disk 16 and elastic component, wherein, stroke fixed disk 15, stroke adjusting disk 16 and elastic component all overlap and establish outside stroke adjusting rod 13, and the second end and the case lid 1 fixed connection of stroke fixed disk 15, the second end of stroke adjusting disk 16 can be blocked with the first end looks of stroke fixed disk 15, the first end of elastic component is connected with stroke adjusting rod 13, the second end is connected with the first end of stroke adjusting disk 16, specifically, the first end of elastic component is close to the first end setting of stroke adjusting rod 13, the elastic component can be compression spring 17, thereby can support stroke adjusting disk 16 tightly on stroke fixed disk 15.

And, the stroke adjusting disc 16 is used to limit the radial rotation of the stroke adjusting rod 13, specifically, the cross-sectional shape of the stroke adjusting rod 13 is waist-shaped or polygonal, and the inner ring of the stroke adjusting disc 16 matches the stroke adjusting rod 13, i.e. the inner ring of the stroke adjusting disc 16 may have the same shape as the cross-sectional shape of the stroke adjusting rod 13, so that the stroke adjusting rod 13 and the stroke adjusting disc 16 cannot rotate relatively, and the stroke adjusting disc 16 is slidably engaged with the stroke adjusting rod 13, so that the stroke adjusting rod 13 and the stroke adjusting disc 16 can slide axially.

Further, one of the first end face of the stroke fixing disc 15 and the second end face of the stroke adjusting disc 16 is provided with a plurality of clamping grooves, the other is provided with a plurality of protrusions, the protrusions are matched with the clamping grooves, and the protrusions can be embedded into the clamping grooves, so that the stroke fixing disc 15 and the stroke adjusting disc 16 are clamped, the stroke adjusting disc 16 is fixed on the stroke fixing disc 15, and the stroke adjusting disc 13 is limited to rotate radially.

It should be noted that the terms "first," "second," "third," and the like, as used herein, are not intended to limit the specific order, but merely to distinguish one element from another or function.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims (10)

1. The utility model provides a miniature measuring pump, its characterized in that, including the box, with box tip fixed connection's pump head (4), setting are in the diaphragm (6) of box tip with be used for driving diaphragm (6) are close to and are kept away from the drive arrangement of pump head (4), drive arrangement including with diaphragm (6) fixed connection's push rod (5), be used for driving push rod (5) are close to and are kept away from the eccentric mechanism of pump head (4) and are used for driving eccentric mechanism pivoted AC synchronous motor (9), AC synchronous motor (9) are located in the box, just eccentric mechanism with output shaft (10) transmission connection of AC synchronous motor (9).

2. The micrometric pump according to claim 1, characterized in that said eccentric mechanism comprises an eccentric shaft (7) and an eccentric bearing (11) for contacting with said push rod (5), said eccentric shaft (7) comprising a first portion coaxially connected with an output shaft (10) of said synchronous ac motor (9) and a second portion for moving said eccentric bearing (11), said first portion and said second portion being connected, said eccentric bearing (11) being housed outside said second portion, and the axes of said first portion and said second portion being not on the same straight line.

3. The micrometric pump according to claim 2, characterized in that the eccentric shaft (7) further comprises a third portion coaxial with the first portion and connected to the top end of the second portion, that the first portion and the third portion are each externally sheathed with a support bearing (12), and that the outer rings of both support bearings (12) are each fixedly connected to the housing.

4. The micrometric pump according to claim 2, characterized in that said push rod (5) comprises a first rod portion connected to said diaphragm (6) and a second rod portion connected to the end of said first rod portion remote from said pump head (4), said second rod portion being provided with an internal cavity, said eccentric bearing (11) being located in said internal cavity, and said eccentric bearing (11) being able to contact with the side wall of said internal cavity close to said pump head (4).

5. The micro metering pump according to claim 2, wherein the driving device further comprises a return spring (8) for driving the push rod (5) to return, one end of the return spring (8) is connected to the case, the other end of the return spring is connected to the push rod (5), and when the push rod (5) is forced to approach the pump head (4), the return spring (8) is extruded to deform; when the stress of the push rod (5) disappears, the return spring (8) restores to deform and drives the push rod (5) to be far away from the pump head (4).

6. The micrometering pump according to claim 5, characterized in that the housing comprises an outer shell (2) and an inner shell (3) located in the outer shell (2), the diaphragm (6) is located at an end of the outer shell (2), the push rod (5) and the return spring (8) are both located in the inner shell (3), the return spring (8) is sleeved outside the push rod (5), and one end of the return spring (8) close to the pump head (4) is connected to the inner shell (3) and one end of the return spring (8) far from the pump head (4) is connected to the push rod (5).

7. The micro metering pump of claim 6, further comprising a stroke adjustment mechanism, the box body also comprises a box cover (1) connected with the shell (2), the stroke adjusting mechanism comprises a stroke adjusting rod (13) positioned in the box body, an adjusting knob (14) used for driving the stroke adjusting rod (13) to move and a limiting device used for limiting the stroke adjusting rod (13) to rotate, one end of the stroke adjusting rod (13) is fixedly connected with the adjusting knob (14), the other end of the stroke adjusting rod extends into the inner shell (3) and can be propped against the push rod (5), the adjusting knob (14) is rotatablely arranged on the box cover (1), the adjusting knob (14) can drive the stroke adjusting rod (13) to move back and forth, the limiting device is sleeved outside the stroke adjusting rod (13) and is fixedly connected with the box cover (1).

8. The micrometric pump according to claim 2, characterized in that the outer wall of said second portion is provided with a stop projection for limiting the axial displacement of said eccentric bearing (11).

9. The micrometric pump according to claim 2, characterized in that the output shaft (10) of the synchronous ac motor (9) is of a semi-cylindrical configuration, the first portion being provided with a semi-cylindrical groove into which the output shaft (10) of the synchronous ac motor (9) protrudes, the output shaft (10) of the synchronous ac motor (9) being matched to the semi-cylindrical groove.

10. The micro metering pump of claim 3, wherein the first portion, the second portion, and the third portion are a unitary structure.

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