阅读说明：本技术 用于非接触式的自动手部消毒机的抽液泵 (Liquid pump for a contactless automatic hand sanitizer ) 是由 竺国荣 于 2020-11-30 设计创作，主要内容包括：本申请公开了一种用于非接触式的自动手部消毒机的抽液泵,包括抽液泵泵体,抽液泵泵体包括外壳、排液管和泵体、驱动装置,泵体包括泵体腔室、偏心凸轮和阻隔组件,泵体腔室包括进液腔和出液腔,泵体腔室出液腔与排液管连通,泵体腔室下端设有进液口,驱动装置带动偏心凸轮沿第一方向转动时,进液腔的容积增大,液体进入进液腔内,出液腔容积减小,出液腔内的液体排入排液管内；驱动装置带动偏心凸轮沿第二方向转动时,出液腔容积增大,排液管内的液体流入出液腔内,进液腔容积减小,进液腔内液体从进液口排出。本抽液泵通过驱动装置控制偏心凸轮的转动能够直接完成吸液排液,并且在抽液完成后进行倒转能够实现液体的回吸,结构简单,可靠性高。(The application discloses a liquid pump for a non-contact automatic hand disinfection machine, which comprises a liquid pump body, wherein the liquid pump body comprises a shell, a liquid discharge pipe, a pump body and a driving device, the pump body comprises a pump body cavity, an eccentric cam and a blocking component, the pump body cavity comprises a liquid inlet cavity and a liquid outlet cavity, the liquid outlet cavity of the pump body cavity is communicated with the liquid discharge pipe, a liquid inlet is formed in the lower end of the pump body cavity, when the driving device drives the eccentric cam to rotate along a first direction, the volume of the liquid inlet cavity is increased, liquid enters the liquid inlet cavity, the volume of the liquid outlet cavity is reduced, and the liquid in the liquid outlet cavity is discharged into; when the driving device drives the eccentric cam to rotate along the second direction, the volume of the liquid outlet cavity is increased, liquid in the liquid discharge pipe flows into the liquid outlet cavity, the volume of the liquid inlet cavity is reduced, and the liquid in the liquid inlet cavity is discharged from the liquid inlet. This drawing liquid pump can directly accomplish the imbibition flowing back through the rotation of drive arrangement control eccentric cam to going forward and reversing after the drawing liquid is accomplished and can realizing the resorption of liquid, simple structure, the reliability is high.)

1. The liquid pump for the non-contact automatic hand disinfection machine is characterized by comprising a liquid pump body, wherein the liquid pump body comprises a shell (20), a liquid discharge pipe (25) and a pump body (40) which are arranged in the shell (20) and used for being connected with a nozzle, and a driving device arranged on the shell (20), the pump body (40) comprises a cavity cover body (3), a pump body cavity (4), an eccentric cam (2) and a blocking component, the eccentric cam (2) and the blocking component are positioned in the pump body cavity (4), the pump body cavity (4) comprises a liquid inlet cavity (13) and a liquid outlet cavity (14) which can be communicated with the liquid inlet cavity (13), the liquid outlet cavity (14) is communicated with the liquid discharge pipe (25), a liquid inlet (15) communicated with the liquid inlet cavity (13) is arranged at the lower end of the pump body cavity (4), and the eccentric cam (2) is used for adjusting the volumes of the liquid inlet cavity (13) and the liquid outlet cavity (14), the blocking assembly abuts against the eccentric cam (2) and is used for blocking the liquid inlet cavity (13) and the liquid outlet cavity (14), the driving device is connected with an eccentric shaft (11) of the eccentric cam (2) and is used for controlling the eccentric rotation of the eccentric cam (2), when the driving device drives the eccentric cam (2) to rotate along a first direction, the volume of the liquid inlet cavity (13) is increased, liquid enters the liquid inlet cavity (13) from the liquid inlet (15), the volume of the liquid outlet cavity (14) is reduced, and the liquid in the liquid outlet cavity (14) is discharged into the liquid discharge pipe (25); when the driving device drives the eccentric cam (2) to rotate along the second direction, the volume of the liquid outlet cavity (14) is increased, liquid in the liquid discharge pipe (25) flows into the liquid outlet cavity (14), the volume of the liquid inlet cavity (13) is reduced, and the liquid in the liquid inlet cavity (13) is discharged from the liquid inlet (15).

2. The liquid pump for a non-contact automatic hand sterilizer according to claim 1, wherein the blocking assembly comprises a sealing ejector rod (8) and a compression spring (7) for controlling the extension and contraction of the sealing ejector rod (8), a first end of the compression spring (7) is fixedly connected with the side wall of the pump body chamber (4) far away from the eccentric cam (2), a second end of the compression spring is fixedly connected with the sealing ejector rod (8), one end of the sealing ejector rod (8) far away from the compression spring (7) is abutted against the side wall of the eccentric cam (2), a gap for passing liquid is left between the sealing ejector rod (8) and the side wall of the pump body chamber (4), the gap is communicated with the liquid inlet chamber (13) and the liquid outlet chamber (14), when the eccentric cam (2) rotates in the first direction, the eccentric cam (2) extrudes the sealing ejector rod (8) so as to enable the sealing ejector rod (8) to be in contact with the side wall of the pump body cavity (4) close to the liquid inlet cavity (13).

3. The liquid pump for a non-contact automatic hand sanitizer according to claim 2, wherein the seal carrier rod (8) is provided with a groove for receiving the second end of the compression spring (7), and a protrusion (23) is provided in the groove, and the second end of the compression spring (7) is fitted over the protrusion (23) and tightly fits the protrusion (23).

4. The liquid pump for automatic hands-free contact sterilization machines according to claim 1, characterized in that the eccentric shaft (11) of the eccentric cam (2) protrudes from the upper end of the pump body chamber (4) and is in driving connection with the drive means.

5. The liquid pump for a non-contact automatic hand sanitizer according to claim 3, wherein the sealing plunger (8) has notches (24) at both the top and bottom ends, and the two notches (24) are symmetrical and have equal wall thickness.

6. The infusion pump for a non-contact automatic hand sanitizer according to claim 1, wherein the bottom end of the pump body chamber (4) is provided with a screen assembly (1), the screen assembly (1) being located below the liquid inlet (15).

7. The liquid pump for a non-contact automatic hand sanitizer according to claim 1, wherein the chamber cover (3) has a through hole for passing the eccentric shaft (11) of the eccentric cam (2) and a liquid outlet (16) connected to the liquid outlet chamber (14), the liquid outlet (16) is connected to the liquid discharge pipe (25), and the bottom end of the chamber cover (3) is fixedly connected to the top end of the pump body chamber (4).

8. The liquid pump for a non-contact automatic hand sanitizer according to claim 7, wherein the bottom end of the chamber cover (3) is connected to the top end of the pump body chamber (4) by a screw.

9. The liquid pump for automatic hands-free sterilization by non-contact according to claim 7, characterized in that the top end of the chamber cover (3) and the bottom end of the pump body chamber (4) are provided with a second stainless steel backing plate (9).

10. The fluid pump for a non-contact automated hand sanitizer according to claim 1 wherein the pump body has a height of 33.5mm and a diameter of 20 mm.

Technical Field

The present application relates to the field of accessory technology for automatic hand sanitizers, and more particularly, to a fluid pump for a non-contact automatic hand sanitizer.

Background

The struggle between human beings and viruses and bacteria begins from the birth of human beings, and the transmission between people becomes more dangerous and difficult to control due to the epidemic of coronavirus in the modern times, and the viruses are generally characterized by strong transmission capability, and have the common phenomenon of people transmission, mainly by droplet transmission and contact transmission of public articles (contact with eyes and noses after touching with hands, etc.). Therefore, in order to block the transmission, reduce the infected people and complete the self-protection, the disinfection of the infection focus part of the hands is very important. Therefore, the hand disinfection machine can effectively restrain the infectious virus which is once popular for several years in the hygiene management of wide industries.

The traditional hand disinfection machine can not realize non-contact in the past, can cause the user to have a conflict psychology through frequently pressing the hydrojet button, and easily cause the contact use of public article, thereby aggravate the propagation of virus, consequently automatic hand disinfection machine has appeared on the market, but the structure of current automatic disinfection machine is complicated, and the friction loss is big between the spare part of automatic disinfection machine's drawing liquid pump, can't reverse the inertia of resorption shower nozzle and pipeline interior residual liquid and spray that cause the antiseptic after the drawing liquid is accomplished, therefore it is extravagant to form the antiseptic.

Therefore, how to solve the problems that the liquid pump of the existing automatic sterilizer has a complex structure, large friction loss among parts and incapability of reversely sucking the residual liquid in the spray head and the pipeline after liquid suction is finished so as to cause inertial spraying is a key technical problem to be solved by technical personnel in the field.

Disclosure of Invention

In order to overcome the problems in the related technology to a certain extent, the application aims to provide the liquid pump for the non-contact automatic hand disinfection machine, which has the advantages of simple structure, low requirement on manufacturing precision and easy processing; the pump is not required to be lubricated, and the abrasion is small; and the sealing between the rotating part and the fixed part can be directly completed by the sealing of disinfectant; the operation is stable and reliable, the operation is simple, and the maintenance is convenient; it can solve the problem that the prior automatic disinfection machine has complex liquid pump structure, large friction loss between parts, and incapability of reversing the residual liquid in the suck-back spray head and the pipeline after the liquid suction is finished, thereby causing inertial spraying.

The application provides a drawing liquid pump for automatic hand sterilizing machine of non-contact, including the drawing liquid pump body, the drawing liquid pump body is including the shell, set up be used for in the shell with nozzle be connected fluid-discharge tube and the pump body, set up drive arrangement on the shell, the pump body is including cavity lid, pump body cavity, be located eccentric cam and separation subassembly in the pump body cavity, pump body cavity including the feed liquor chamber with can with the play liquid chamber that the feed liquor chamber is linked together, just go out the liquid chamber with the fluid-discharge tube is linked together, the lower extreme of pump body cavity be provided with the inlet that the feed liquor chamber is linked together, eccentric cam is used for adjusting the feed liquor chamber with the volume in play liquid chamber, the separation subassembly with eccentric cam offsets, is used for cutting off the feed liquor chamber with go out the liquid chamber, drive arrangement with eccentric cam's eccentric shaft is connected, When the driving device drives the eccentric cam to rotate along a first direction, the volume of the liquid inlet cavity is increased, liquid enters the liquid inlet cavity from the liquid inlet, the volume of the liquid outlet cavity is reduced, and the liquid in the liquid outlet cavity is discharged into the liquid discharge pipe; when the driving device drives the eccentric cam to rotate along the second direction, the volume of the liquid outlet cavity is increased, liquid in the liquid discharge pipe flows into the liquid outlet cavity, the volume of the liquid inlet cavity is reduced, and the liquid in the liquid inlet cavity is discharged from the liquid inlet.

Preferably, the separation assembly comprises a sealing ejector rod and a compression spring used for controlling the sealing ejector rod to stretch, a first end of the compression spring is fixedly connected with the side wall of the pump body cavity far away from the eccentric cam, a second end of the compression spring is fixedly connected with the sealing ejector rod, one end of the sealing ejector rod far away from the compression spring is tightly abutted to the side wall of the eccentric cam, a gap for liquid to pass through is reserved between the sealing ejector rod and the side wall of the pump body cavity, the gap is communicated with the liquid inlet cavity and the liquid outlet cavity, and when the eccentric cam rotates along the first direction, the eccentric cam extrudes the sealing ejector rod to enable the sealing ejector rod to be in contact with the side wall of the pump body cavity close to the liquid inlet cavity.

Preferably, the sealing ejector rod is provided with a groove for embedding the second end of the compression spring, a protrusion is arranged in the groove, and the second end of the compression spring is sleeved outside the protrusion and is tightly matched with the protrusion.

Preferably, the eccentric shaft of the eccentric cam extends out of the upper end of the pump body cavity and is in transmission connection with the driving device.

Preferably, the upper end and the lower end of the sealing ejector rod are both provided with a notch groove, and the two notch grooves are symmetrical and have equal wall thickness.

Preferably, the bottom end of the pump body cavity is provided with a filter screen assembly, and the filter screen assembly is located below the liquid inlet.

Preferably, the cavity cover body is provided with a through hole for the eccentric shaft of the eccentric cam to pass through and a liquid outlet communicated with the liquid outlet cavity, the liquid outlet is communicated with the liquid discharge pipe, and the bottom end of the cavity cover body is fixedly connected with the top end of the cavity of the pump body.

Preferably, the bottom end of the cavity cover body is fixedly connected with the top end of the pump cavity through a screw.

Preferably, the bottom end of the cavity of the pump body is provided with a first stainless steel base plate, and the top end of the cavity cover body is provided with a second stainless steel base plate.

Preferably, the height of the pump body of the liquid pump is 33.5mm, and the diameter of the pump body of the liquid pump is 20 mm.

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

the application provides a drawing liquid pump that is used for automatic hand sterilizing machine of non-contact, when drive arrangement drove eccentric cam and rotates along the first direction, the volume increase in feed liquor chamber, and the pressure in the feed liquor intracavity reduces, forms the negative pressure cavity, and the feed liquor intracavity is inhaled from the inlet to the liquid in bottle or holding vessel or the container, realizes the extraction to liquid, accomplishes the imbibition. Simultaneously, the volume of going out the liquid chamber reduces, and the pressure increase in going out the liquid chamber forms the malleation cavity, and the liquid that goes out the liquid intracavity is discharged to the flowing back intraductal from the liquid outlet to realize the discharge to liquid, accomplish the flowing back, use for the user. When the driving device drives the eccentric cam to rotate along the second direction, the volume of the liquid outlet cavity is increased, the pressure in the liquid outlet cavity is reduced, a negative pressure cavity is formed, and residual liquid in the spray head and the liquid discharge pipe is sucked back into the liquid outlet cavity. Meanwhile, the volume of the liquid inlet cavity is reduced, the pressure of the liquid inlet cavity is increased, a positive pressure cavity is formed, and liquid in the liquid inlet cavity can flow back into the bottle body or the storage tank or the container through the liquid inlet. In this way, the suck-back of the liquid can be achieved by the inversion of the eccentric cam, avoiding the inertial spraying of the liquid.

According to the arrangement, the liquid pump directly finishes liquid suction and discharge by controlling the rotation of the eccentric cam through the driving device, and can realize the back suction of liquid staying in the liquid discharge pipe by reversing after the liquid suction is finished; compared with other types of liquid pumps, the liquid pump has a simple structure, and meanwhile, the friction loss between the relatively moving parts is less, and the reliability is higher; the liquid pump only has the eccentric cam with smaller reciprocating inertia force, the rotating inertia force can be completely balanced, the operation is stable, and compared with other pumps, the liquid pump has smaller mechanical vibration and lower noise; the problem of current automatic disinfection machine's drawing liquid pump structure complicated, the friction loss between spare part is big, the noise is big and can't reverse the residual liquid in resorption shower nozzle and the pipeline after the imbibition is accomplished and cause inertial spraying is solved.

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 an overall schematic view of the present aspiration pump shown in accordance with certain exemplary embodiments;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is an overall schematic view of a pump body shown in accordance with some exemplary embodiments;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a diagram illustrating a position relationship of a pump body and a motor according to some exemplary embodiments;

FIG. 6 is a sectional view taken along line B-B in FIG. 3 (a state in which the eccentric cam presses the intake chamber);

FIG. 7 is a cross-sectional view B-B of FIG. 3 (a state view in which the eccentric cam is extruding the liquid chamber);

FIG. 8 is a perspective view of a pump body cavity shown in accordance with some exemplary embodiments;

FIG. 9 is a perspective view of a chamber cover shown in accordance with some exemplary embodiments;

FIG. 10 is a perspective view of a chamber cover shown in accordance with some exemplary embodiments;

FIG. 11 is a perspective view of a seal ram shown in accordance with some exemplary embodiments;

FIG. 12 is a side view of a seal ram shown in accordance with some exemplary embodiments;

FIG. 13 is a perspective view of a filter screen assembly shown in accordance with some exemplary embodiments;

FIG. 14 is a bottom view of a screen assembly according to some exemplary embodiments;

FIG. 15 is a top view of a pump body shown in accordance with some exemplary embodiments;

FIG. 16 is a block diagram of a pump shaft shown in accordance with some exemplary embodiments.

In the figure:

1. a screen assembly; 2. an eccentric cam; 3. a chamber cover; 4. a pump body cavity; 5. filtering with a screen; 6. a first stainless steel backing plate; 7. a compression spring; 8. sealing the ejector rod; 9. a second stainless steel backing plate; 10. a motor; 11, an eccentric shaft; 12. a liquid outlet pipe; 13. a liquid inlet cavity; 14. a liquid outlet cavity; 15. a liquid inlet; 16. a liquid outlet; a first chamber; 18. a second chamber; 19. a convex portion; 20. a housing; 21. pipe passing; 22. a base; 23. a protrusion; 24. notching; 25. a liquid discharge pipe; 30. a drive shaft; 40. and a pump body.

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 to 16, the present embodiment provides a liquid pump for a non-contact automatic hand sterilizer, including a liquid pump body, the liquid pump body includes a housing 20, a liquid discharge pipe 25, a pump body 40 and a driving device, the pump body 40 includes a cavity cover 3, a pump cavity 4, an eccentric cam 2 and a blocking component, the pump cavity 4 includes a liquid inlet cavity 13 and a liquid outlet cavity 14, and the eccentric cam 2 and the blocking component are both located in the pump cavity 4, the eccentric cam 2 is used for adjusting the volumes of the liquid inlet cavity 13 and the liquid outlet cavity 14, and the blocking component constantly offsets against the eccentric cam 2 to block the liquid inlet cavity 13 and the liquid outlet cavity 14, thereby ensuring the independence of the liquid inlet cavity 13 and the liquid outlet cavity 14.

Wherein, the liquid outlet cavity 14 is communicated with the liquid discharge pipe 25, so that the liquid in the liquid outlet cavity 14 can flow into the liquid discharge pipe 25. The lower end of the pump body cavity 4 is provided with a liquid inlet 15, and the liquid inlet 15 is communicated with the liquid inlet cavity 13, so that liquid in a bottle body or a storage tank or a container and the like can conveniently flow into the liquid inlet cavity 13 through the liquid inlet 15.

It should be noted that the liquid discharge pipe 25 and the pump body 40 are both disposed in the housing 20, and the bottom end of the liquid discharge pipe 25 is communicated with the liquid outlet cavity 14 of the pump body 40, and the top end is communicated with the nozzle, so as to spray the liquid for the user to use.

The driving means is provided on the housing 20 and is connected with the eccentric shaft 11 of the eccentric cam 2 for controlling the eccentric rotation of the eccentric cam 2.

Here, the liquid pump further includes a control system communicably connected to the drive device, and an electronic program is provided in the control system to control the operation of the drive device by the electronic program.

When the electronic program control driving device drives the eccentric cam 2 to rotate along the first direction, as shown in fig. 6, the volume of the liquid inlet cavity 13 is increased, the pressure in the liquid inlet cavity 13 is reduced to form a negative pressure cavity, and the liquid in the bottle body or the storage tank or the container enters the liquid inlet cavity 13 from the liquid inlet 15, so that the liquid is extracted, and the liquid absorption is completed. Meanwhile, the volume of the liquid outlet cavity 14 is reduced, the pressure in the liquid outlet cavity 14 is increased to form a positive pressure chamber, and the liquid in the liquid outlet cavity 14 is discharged into the liquid discharge pipe 25, so that the liquid is discharged, and the liquid discharge is completed for a user to use.

When the electronic program control driving device drives the eccentric cam 2 to rotate along the second direction, the volume of the liquid outlet cavity 14 is increased, the pressure in the liquid outlet cavity 14 is reduced, a negative pressure cavity is formed, the residual liquid in the liquid discharge pipe 25 is sucked back into the liquid outlet cavity 14, meanwhile, the volume of the liquid inlet cavity 13 is reduced, the pressure of the liquid inlet cavity 13 is increased, a positive pressure cavity is formed, the liquid in the liquid inlet cavity 13 can flow back into the bottle body or the storage tank or the container through the liquid inlet 15, therefore, the back suction of the liquid staying in the liquid discharge pipe can be realized through the reverse rotation of the eccentric cam 2, and the inertial spraying of the liquid is avoided.

It should be noted that the first direction is clockwise as indicated by an arrow in fig. 6, and the second direction is counterclockwise as indicated by an arrow in fig. 6.

By the arrangement, the liquid pump controls the driving device through an electronic program so as to control the rotation of the eccentric cam 2 to directly complete liquid suction and discharge, and can realize the back suction of liquid after the liquid suction is completed and the reverse rotation is carried out; compared with other types of liquid pumps, the liquid pump has a simple structure, and meanwhile, the friction loss between the relatively moving parts is less, and the reliability is higher; the liquid pump only has the eccentric cam 2 with smaller reciprocating inertia force, the rotating inertia force can be completely balanced, the operation is stable, and compared with other pumps, the liquid pump has smaller mechanical vibration and lower noise; the problem of current automatic disinfection machine's drawing liquid pump structure complicated, the friction loss between spare part is big, the noise is big and can't reverse the residual liquid in resorption shower nozzle and the pipeline after the imbibition is accomplished and cause inertial spraying is solved.

In the preferred scheme of this embodiment, as shown in fig. 5 and 6, the separation subassembly is including sealed ejector pin 8 and compression spring 7, compression spring 7's first end and pump body cavity 4 keep away from eccentric cam 2's lateral wall fixed connection, second end and sealed ejector pin 8 fixed connection, the one end that compression spring 7 was kept away from to sealed ejector pin 8 offsets tightly with eccentric cam 2's lateral wall, like this, because compression spring 7's effect, make sealed ejector pin 8 offset tightly with eccentric cam 2 constantly, so that the isolation that shows liquid chamber 14 and feed liquor chamber 13 is realized.

A gap for liquid to pass through is reserved between the sealing ejector rod 8 and the side wall of the pump body cavity 4, and the gap is communicated with the liquid inlet cavity 13 and the liquid outlet cavity 14, so that liquid in the liquid inlet cavity 13 enters the liquid outlet cavity 14.

When the eccentric cam 2 is controlled by an electronic program to rotate along a first direction, the eccentric cam 2 extrudes the sealing ejector rod 8, so that the sealing ejector rod 8 deflects towards the liquid inlet cavity 13, the sealing ejector rod 8 is contacted with the side wall of the pump body cavity 4 close to the liquid inlet cavity 13, the liquid inlet cavity 13 is sealed, liquid in the liquid inlet cavity 13 can not flow into the liquid outlet cavity 14 through a gap between the sealing ejector rod 8 and the side wall of the pump body cavity 4, the liquid inlet cavity 13 and the liquid outlet cavity 14 are isolated and sealed, and the liquid inlet cavity 13 and the liquid outlet cavity 14 are ensured to be mutually independent.

Here, when the eccentric cam 2 is located at the initial position, the sealing ejector rod 8 is not in contact with the side wall of the pump body cavity 4, and the liquid in the liquid inlet cavity 13 can flow into the liquid outlet cavity 14 through the gap, so that the liquid supplement of the liquid outlet cavity 14 is realized. When the driving device drives the eccentric cam 2 to rotate for a half-turn along the first direction, the eccentric cam 2 extrudes the sealing ejector rod 8 to enable the sealing ejector rod 8 to be contacted with the side wall of the pump body cavity 4 close to the liquid inlet cavity 13 so as to seal a gap between the liquid inlet cavity 13 and the liquid outlet cavity 14, so that liquid in the liquid inlet cavity 13 cannot flow into the liquid outlet cavity 14, at the moment, the eccentric cam 2 rotates towards the liquid outlet cavity 14 to reduce the volume of the liquid outlet cavity 14, thereby forming a positive pressure cavity, and enabling the liquid to flow out of the liquid outlet cavity 14; the volume of the liquid inlet cavity 13 is increased to form a negative pressure cavity, and liquid is sucked into the liquid inlet cavity 13 from the liquid inlet 15. When the electronic program control driving device drives the eccentric cam 2 to rotate for a half-turn along the second direction, the eccentric cam 2 extrudes the sealing ejector rod 8, so that the sealing ejector rod 8 is in contact with the side wall of the pump body cavity 4 close to the liquid inlet cavity 13 to seal the gap between the liquid inlet cavity 13 and the liquid outlet cavity 14, the volume of the liquid outlet cavity 14 is increased, the pressure is reduced, and the liquid in the liquid discharge pipe 25 flows back into the liquid outlet cavity 14 to realize the suck-back.

Here, as shown in fig. 8, the pump body chamber 4 includes a first chamber 17 and a second chamber 18 communicated with the first chamber 17, the liquid inlet chamber 13, the liquid outlet chamber 14 and the eccentric cam 2 are all located in the first chamber 17, the blocking component is located in the second chamber 18 and has a gap with a side wall of the second chamber 18, the first end of the compression spring 7 is fixedly connected with a side wall of the second chamber 18 far from the first chamber 17, and when the eccentric cam 2 presses the sealing ejector rod 8, the sealing ejector rod 8 can be in contact with a connecting end of the side wall of the second chamber 18 and the side wall of the first chamber 17 to block the liquid inlet chamber 13 and the liquid outlet chamber 14. The first cavity 17 and the second cavity 18 are of an integral structure, and the wall thickness of the side wall of the first cavity 17 is the same as that of the side wall of the second cavity 18, so that on one hand, raw material saving is facilitated, and on the other hand, the minimum deformation amount during shaping is guaranteed.

Wherein, the sealing mandril 8 is provided with a groove for embedding the second end of the compression spring 7.

Preferably, as shown in fig. 10, a protrusion 23 is disposed in the groove, and the second end of the compression spring 7 is sleeved outside the protrusion 23 and is tightly fitted with the protrusion 23, so that the stability of the connection between the compression spring 7 and the sealing mandril 8 is improved, and the offset and the reset of the sealing mandril 8 are facilitated.

Here, the protrusion 23 and the sealing ejector rod 8 are of an integrated structure, which is beneficial to reducing the connection structure and simplifying the structure.

The upper end and the lower end of the sealing ejector rod 8 are both provided with notches 24, so that the wall thickness of the sealing ejector rod 8 is uniform, and the sealing ejector rod 8 is not easy to deform under stress.

In this embodiment, the eccentric shaft 11 of the eccentric cam 2 extends out of the upper end of the pump body chamber 4, and the eccentric shaft 11 of the eccentric cam 2 is connected to the driving device, so that the driving device drives the eccentric cam 2 to rotate.

Here, the driving device includes a motor 10 and a transmission shaft 30, the motor 10 may be a dc permanent magnet motor, the top end of the transmission shaft 30 is connected to an output shaft of the dc permanent magnet motor 10, and the bottom end of the transmission shaft 30 is connected to an eccentric shaft 11 of the eccentric cam 2, so as to form a transmission device to drive the eccentric cam 2 to rotate.

Specifically, the eccentric shaft 11 of the eccentric cam 2 is fixedly connected with the bottom end of the transmission shaft 30 through a shaft sleeve, thereby facilitating the transmission of the transmission shaft 30.

In some embodiments, the chamber cover 3 is provided with a through pipe 21 and a liquid outlet 16, and the liquid outlet 16 is communicated with the liquid outlet cavity 14 and the liquid discharge pipe 25, so that the liquid in the liquid outlet cavity 14 flows into the liquid discharge pipe 25; the eccentric shaft 11 of the eccentric cam 2 passes through the through pipe 21 and is connected with the transmission shaft 30, so that the transmission shaft 30 drives the eccentric cam 2 to rotate.

Specifically, a liquid outlet pipe 12 is further disposed on the cavity cover body 3, and the liquid outlet pipe 12 is communicated with the liquid outlet 16.

The bottom of cavity lid 3 passes through screw rod fixed connection with the upper end of pump body cavity 4, sets up like this, and cavity lid 3 can play sealed effect to pump body cavity 4.

The top of pump body cavity 4 is provided with two convex parts 19, and the bottom of cavity lid 3 is provided with two draw-in grooves that correspond respectively with two convex parts 19, and two convex parts 19 can be embedded in two draw-in grooves respectively to improve the steadiness that cavity lid 3 and pump body cavity 4 are connected.

Preferably, a first stainless steel backing plate 6 is disposed at the bottom end of the pump body cavity 4, and a second stainless steel backing plate 9 is disposed at the top end of the cavity cover 3, so as to protect the pump body 40 of the present liquid pump.

The diameter of the second stainless steel backing plate 9 is the same as the diameter of the bottom end of the cavity cover body 3, a first through hole for the eccentric shaft 11 of the eccentric cam 2 to pass through and a second through hole for the liquid outlet pipe 12 to pass through are arranged on the second stainless steel backing plate 9, the second stainless steel backing plate 9 is fixedly connected with the stainless steel backing plate at the bottom end of the cavity cover body 3 through a screw, the second stainless steel backing plate 9 is located in the shell 20 and can be clamped on the shell 20, and the stability of the connection of the pump body 40 and the shell 20 is improved.

In other embodiments, as shown in fig. 3, the bottom end of the pump body cavity 4 is provided with the filter screen assembly 1, and the filter screen assembly 1 is disposed below the liquid inlet 15 to filter the liquid flowing into the liquid inlet cavity 13.

Specifically, as shown in fig. 13, the filter screen assembly 1 includes a base 22 and a filter screen 5 disposed in the base 22, the filter screen 5 and the base 22 are in an integrated structure, and the filter screen 5 may be embedded in the base 22 during the injection molding of the base 22. The base 22 is sleeved outside the bottom end of the pump body cavity 4, and the base 22 is tightly matched with the bottom end of the pump body cavity 4 so as to realize the fixed connection between the pump body cavity 4 and the base 22.

In order to strengthen the stability of the connection between the pump body cavity 4 and the filter screen assembly 1, a through hole for a screw to pass through is arranged in the middle of the filter screen assembly 1, and a bottom hole matched with the through hole is arranged at the bottom end of the pump body cavity 4 so as to fixedly connect the pump body cavity 4 and the filter screen assembly 1 through a self-tapping screw.

In this embodiment, the pump body of the liquid pump may have an overall height of 33.5mm and a diameter of 20 mm. Specifically, the outer diameter of the pump body 40 may be 20mm, the diameter of the eccentric cam 2 may be 9mm, the diameter of the transmission shaft 30 may be 2.4mm, and the width of the seal carrier rod 8 may be 3.5mm and the length may be 7.9 mm. The motor 10 adopted by the liquid pump is a micro motor to reduce the volume of the liquid pump, so that the liquid pump can be used on a disinfection machine or other equipment with smaller volume. The dimensions of the components of the liquid pump are not particularly limited and may be set according to actual use.

This embodiment provides a drawing liquid pump for automatic hand sterilizing machine of non-contact, and pump body 40 is protected by shell 20 to the stability of the work of protection pump body 40 sets up a direct current permanent-magnet machine above shell 20, thereby direct current permanent-magnet machine rotates drive transmission shaft 30 and drives the eccentric cam 2 rotation in the pump body 40, is connected with fluid-discharge tube 25 on the pump body 40, thereby it realizes the disinfection to be used for supplying the antiseptic solution to derive to the nozzle from the holding vessel through pump body 40. The pump body 40 is including cavity lid 3 and pump body cavity 4, and eccentric cam 2 sets up in pump body cavity 4, is provided with feed liquor chamber 13 and play liquid chamber 14 in the pump body cavity 4, and eccentric cam 2 follows the transmission shaft 30 and rotates, changes the volume in feed liquor chamber 13 and play liquid chamber 14 to realize drawing liquid and flowing back. The eccentric cam 2 rotates clockwise when pumping liquid, the volume of the liquid inlet cavity 13 is gradually increased, the pressure is gradually reduced to form a negative pressure cavity, liquid is pumped, the volume of the liquid outlet cavity 14 is gradually reduced, the pressure is gradually increased to form a positive pressure cavity, liquid is drained, a sealing ejector rod 8 is installed in the pump body cavity 4 and used for isolating the liquid inlet cavity 13 and the liquid outlet cavity 14, the sealing ejector rod 8 always isolates and seals the liquid inlet cavity 13 and the liquid outlet cavity 14 in the clockwise rotation process of the eccentric cam 2 to ensure that the two cavities are mutually independent, the sealing ejector rod 8 is controlled by a compression spring 7 to ensure that the sealing ejector rod 8 always abuts against the eccentric cam 2 to ensure that the cavities are sealed; the bottom of the pump body cavity 4 is provided with a filter screen assembly 1 for filtering the sucked liquid, and the upper part and the lower part of the pump body 40 are respectively provided with a second stainless steel backing plate 9 and a first stainless steel backing plate 6 for fixing and protecting the pump body 40. After the imbibition is accomplished, the motor anticlockwise rotation makes 2 anticlockwise rotations of eccentric cam through transmission shaft 30, with the remaining liquid suck-back in the fluid-discharge tube 25 go out the sap cavity 14 in, the sap cavity 13 is advanced in the extrusion of eccentric cam 2, makes the volume reduction in feed liquor chamber 13 become the malleation cavity, arrange liquid back to the liquid storage tank in, avoided the inertia of liquid to spray.

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