CN215409124U

CN215409124U - Micro pump

Info

Publication number: CN215409124U
Application number: CN202121380828.6U
Authority: CN
Inventors: 王海雨
Original assignee: Guangdong Keyukang Technology Co ltd
Current assignee: Guangdong Keyukang Technology Co ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-01-04
Anticipated expiration: 2031-06-21

Abstract

The utility model discloses a micropump, comprising: the rotary driving device is provided with a rotating shaft, and the rotating shaft is synchronously connected with an eccentric wheel; the pump body is connected with the rotary driving device and comprises a shell, a piston rod, a leather cup, a valve plate and a sealing cover, wherein one end of the piston rod is rotatably connected with the eccentric wheel, and the other end of the piston rod is detachably connected with the leather cup; the leather cup is connected with the valve plate in a sealing mode, a variable volume cavity is formed between the leather cup and the valve plate, the screw portion between the leather cup and the piston rod is located outside the variable volume cavity, the shell, the valve plate and the sealing cover are connected in sequence, the valve plate and the sealing cover are jointly provided with the inflow channel and the outflow channel, the inflow channel and the outflow channel are respectively communicated with the variable volume cavity in one direction, and the directions of the one-way communication of the inflow channel and the outflow channel are opposite. Compared with the prior art, the liquid medium in the variable volume cavity can not contact with the screw rod part, so that the screw rod part is prevented from being corroded, and the purity of the liquid medium is ensured.

Description

Micro pump

Technical Field

The utility model relates to the technical field of displacement pumps, in particular to a micro pump.

Background

The pump body is a device capable of removing fluid from a closed space or adding fluid from the closed space, the pump body which is widely applied in industry is a micro pump, and the micro pump has the advantages of small volume, low power consumption, stable working condition and the like, so that the pump body is widely applied to the industries of medical health, scientific research, laboratories, environmental protection, instruments and meters, chemical industry, household appliances and the like.

The piston rod of the existing micropump is connected with the cup simply, the cup is connected with the piston rod through a bolt generally, and for the micropump taking liquid as a medium, the bolt is contacted with the liquid all the time, so that the bolt is easily corroded, and then the liquid medium is polluted.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a micropump that solves one or more of the problems set forth in the prior art, and provides at least one useful alternative or creation.

A micropump according to an embodiment of a first aspect of the present invention includes:

the rotary driving device is provided with a rotating shaft, and the rotating shaft is synchronously connected with an eccentric wheel;

the pump body comprises a shell and a pump assembly, the shell is connected to the rotary driving device, the pump assembly comprises a piston rod, a leather cup, a valve plate and a sealing cover, one end of the piston rod is rotatably connected to the eccentric wheel, the piston rod is provided with a first mounting hole, a nut part is mounted in the first mounting hole, the leather cup is provided with a second mounting hole, and a screw part which can be in threaded connection with the nut part is mounted on the second mounting hole, so that the other end of the piston rod can be detachably connected to the leather cup; the packing leather cup with valve plate sealing connection makes the packing leather cup with form variable volume cavity between the valve plate, the second mounting hole not with variable volume cavity intercommunication, shell, valve plate and closing cap connect gradually, the valve plate with the closing cap is equipped with inflow channel and outflow channel jointly, inflow channel with outflow channel respectively with variable volume cavity carries out one-way switch-on, inflow channel toward the direction of variable volume cavity switches-on, variable volume cavity toward the direction of outflow channel switches-on.

The micropump provided by the embodiment of the utility model has at least the following beneficial effects: when the rotary driving device drives the eccentric wheel to rotate, the piston rod can move back and forth along with the eccentric wheel, so that the volume of the variable-volume cavity can be circularly changed through the back and forth movement of the piston rod, and finally the suction and discharge functions of the micro pump are realized; compared with the prior art, because the second mounting hole not with variable volume cavity intercommunication, consequently the liquid medium in the variable volume cavity can not with screw rod portion contacts to avoid screw rod portion is corroded, thereby ensures liquid medium's purity.

According to some embodiments of the utility model, the outer circumferential surface of the nut portion is provided with first anti-slip teeth, and the inner wall of the first mounting hole is provided with first teeth matched with the structure of the first anti-slip teeth; the outer peripheral surface of the screw rod part is provided with second anti-skidding teeth, and the inner wall of the second mounting hole is provided with second teeth matched with the structure of the second anti-skidding teeth. The arrangement is such that the nut portion and the screw portion can be detachably connected to the first mounting hole and the second mounting hole, respectively, and the nut portion and the screw portion are prevented from being slid, so that the nut portion or the screw portion can be replaced.

According to some embodiments of the utility model, a bearing is mounted at one end of the piston rod, and the piston rod is rotatably connected to the eccentric wheel via the bearing. The arrangement of the bearing can reduce the rotation loss between the eccentric wheel and the piston rod so as to improve the quality of eccentric motion.

According to some embodiments of the utility model, a counterweight is connected to the eccentric for statically balancing the eccentric to reduce the amplitude of the micropump in use.

According to some embodiments of the utility model, the valve plate is provided with a suction nozzle and a discharge nozzle, the suction nozzle and the discharge nozzle communicating with the inflow channel and the outflow channel, respectively. When liquid media need to be pumped, the material suction nozzle is used for being connected with a negative pressure pipe, and the discharge nozzle is connected with a drain pipe; when liquid media need to be filled, the discharge nozzle is used for being connected with a positive pressure pipe, and the suction nozzle is connected with the water inlet pipe at the moment.

According to some embodiments of the utility model, a filter section is arranged between the discharge nozzle and the outflow channel in order to avoid solid impurities in the liquid medium from entering the discharge nozzle.

According to some embodiments of the utility model, the cover cap is provided with two indication marks corresponding to the suction nozzle and the discharge nozzle, respectively, so that a user can visually recognize the suction nozzle and the discharge nozzle.

According to some embodiments of the utility model, the housing comprises a housing frame connected to the rotary drive device and a removable cover detachably connected to the housing frame for facilitating maintenance or repair of the pump assembly within the pump body.

According to some embodiments of the present invention, in order to ensure accurate installation of the sealing cover and the valve plate, the sealing cover is provided with a plurality of positioning pillars, the valve plate is provided with a plurality of positioning holes, and all the positioning pillars and all the positioning holes are respectively arranged in a one-to-one correspondence manner.

According to some embodiments of the utility model, the rotary driving device is an electric motor or a pneumatic motor, the electric motor is driven by electric power, the pneumatic motor is driven by compressed gas, and the electric motor or the pneumatic motor can be selected by users according to different use conditions.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic perspective view of a micro-pump according to an embodiment of the present invention;

FIG. 2 is a top view of the micro-pump shown in FIG. 1;

FIG. 3 is a cross-sectional view of the micro-pump of FIG. 2 taken along line A-A;

FIG. 4 is a schematic perspective view of a micro-pump according to an embodiment of the present invention with the housing removed;

FIG. 5 is an exploded view of the micro-pump shown in FIG. 1;

fig. 6 is an exploded view of a piston rod and cup in accordance with an embodiment of the present invention.

In the drawings: 100-rotary driving device, 200-pump body, 110-rotating shaft, 300-eccentric wheel, 111-flat position, 310-eccentric hole, 210-shell, 400-pump assembly, 410-piston rod, 420-leather cup, 430-valve plate, 440-sealing cover, 411-bearing, 412-first mounting hole, 413-nut part, 422-second mounting hole, 423-screw part, 401-variable volume cavity, 402-inflow channel, 403-outflow channel, 431-inflow port, 4131-first anti-slip tooth, 4121-first tooth, 4231-second anti-slip tooth, 4221-second tooth, 320-balancing weight, 432-suction nozzle, 433-discharge nozzle, 434-clamping groove, 510-filter screen, 500-filter part, 441-indication mark, 211-shell frame, 212-movable cover and 435-positioning hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

As shown in fig. 1 to 5, a micropump according to an embodiment of the first aspect of the present invention includes a rotation driving device 100 and a pump body 200, wherein the rotation driving device 100 may be a motor, the rotation driving device 100 is provided with a rotating shaft 110, and the rotating shaft 110 is synchronously connected with an eccentric 300; in order to realize the synchronous connection between the rotating shaft 110 and the eccentric wheel 300, the rotating shaft 110 is provided with a flat position 111, the eccentric wheel 300 is provided with an eccentric hole 310 matched with the structure of the flat position 111, or the rotating shaft 110 and the eccentric hole 310 are synchronously connected through a key and a key slot. In other embodiments, an air motor may be used in place of the electric motor, but because of its large size, an air motor is not preferred for the present invention.

As shown in fig. 3 and 5, the pump body 200 includes a housing 210 and a pump assembly 400, the housing 210 is connected to the rotary driving device 100, the pump assembly 400 includes a piston rod 410, a cup 420, a valve plate 430 and a cover 440, a bearing 411 is installed at one end of the piston rod 410, and the piston rod 410 is rotatably connected to the eccentric 300 through the bearing 411 to reduce the rotational loss between the eccentric 300 and the piston rod 410, thereby improving the quality of eccentric motion. As shown in fig. 3 and 6, the piston rod 410 is provided with a first mounting hole 412, a nut portion 413 is mounted in the first mounting hole 412, the cup 420 is provided with a second mounting hole 422, and a screw portion 423 capable of being screwed with the nut portion 413 is mounted on the second mounting hole 422, so that the other end of the piston rod 410 is detachably connected to the cup 420. As shown in fig. 3 and 5, the cup 420 and the valve plate 430 are hermetically connected by an adhesive, so that a variable volume cavity 401 is formed between the cup 420 and the valve plate 430, the piston rod 410 performs a piston motion along with the eccentric rotation of the eccentric wheel 300, the piston rod 410 changes the volume of the variable volume cavity 401 by driving the cup 420, and the second mounting hole 422 is not communicated with the variable volume cavity 401, so as to isolate the contact between the screw portion 423 and a liquid medium, prevent the screw portion 423 from being corroded, and ensure the purity of the liquid medium. The housing 210, the valve plate 430 and the sealing cover 440 are sequentially connected by a connecting bolt, the valve plate 430 and the sealing cover 440 are provided with an inflow channel 402 and an outflow channel 403 together, the inflow channel 402 and the outflow channel 403 are not communicated with each other, the valve plate 430 is provided with an inflow port 431 and an outflow port (not shown in the figures) at the position of the variable volume cavity 401, and the valve plate 430 is provided with a one-way conduction member (not shown in the figures) at the position of the inflow port 431 and at the position of the outflow port, such as an umbrella cube or a diaphragm, so that the inflow channel 402 and the outflow channel 403 can be respectively in one-way conduction with the variable volume cavity 401, the inflow channel 402 is in conduction towards the variable volume cavity 401, the variable volume cavity 401 is in conduction towards the outflow channel 403, thereby ensuring that the inflow channel 402 is only used for inflow of fluid, whereas the outflow channel 403 is used only for outflow of fluid. When the cavity volume of the cup 420 is gradually increased along with the movement of the piston rod 410, the variable volume cavity 401 is in a negative pressure state, in this state, the external fluid can enter the variable volume cavity 401 of the cup 420 through the inflow channel 402, and the outflow port is closed by the one-way conduction piece; when the cavity volume of the cup 420 gradually decreases with the movement of the piston rod 410, the variable volume cavity 401 is in a positive pressure state, in which the fluid in the variable volume cavity 401 can be discharged to the outside through the outflow channel 403, and the inflow port 431 is closed by the one-way conduction member. With the continuous movement of the piston rod 410, the variable volume cavity 401 is alternately in two different working states, thereby realizing the suction and discharge functions of the micro pump.

As shown in fig. 3 and 6, in some embodiments of the present invention, when the micro pump is applied to a liquid medium, although the variable volume chamber 401 is isolated from the screw part 423 and the nut part 413, respectively, the screw part 423 and the nut part 413 are inevitably corroded to some extent, in order to facilitate replacement of the nut part 413 or the screw part 423, the outer circumferential surface of the nut part 413 is provided with first anti-slip teeth 4131, and the inner wall of the first mounting hole 412 is provided with first teeth 4121 matching the structure of the first anti-slip teeth 4131; the outer circumferential surface of the screw portion 423 is provided with second anti-slip teeth 4231, and the inner wall of the second mounting hole 422 is provided with second teeth 4221 matched with the second anti-slip teeth 4231, so that the nut portion 413 and the screw portion 423 can be detachably connected to the first mounting hole 412 and the second mounting hole 422 respectively, and the nut portion 413 and the screw portion 423 are prevented from slipping.

As shown in fig. 4 and 5, in some embodiments of the present invention, in order to reduce the vibration amplitude of the micro pump during use, a weight block 320 is connected to the eccentric 300, the weight block 320 is close to the eccentric hole 310, and the weight block 320 is used for achieving static balance of the eccentric 300 so as to smooth the eccentric motion. The eccentric wheel 300 and the weight member 320 may be integrally formed or separately formed, and in this embodiment, they are integrally formed.

As shown in fig. 1, in some embodiments of the present invention, the valve plate 430 is provided with a suction nozzle 432 and a discharge nozzle 433, and the suction nozzle 432 and the discharge nozzle 433 communicate with the inflow channel 402 and the outflow channel 403, respectively. When liquid media need to be sucked, the suction nozzle 432 is used for being connected with a negative pressure pipe, and the discharge nozzle 433 is connected with a drain pipe; when liquid media need to be filled, the discharge nozzle 433 is used for connecting a positive pressure pipe, and at the moment, the suction nozzle 432 is connected with a water inlet pipe. Besides, in order to prevent solid impurities in the liquid medium from entering the discharge nozzle 433, the outflow channel 403 is provided with a clamping groove 434 at an end close to the discharge nozzle 433, the clamping groove 434 is used for inserting the filter part 500 with a filter screen 510, and the filter screen 510 is used for filtering the solid impurities in the liquid medium. Before the filter part 500 is cleaned, the cover 440 is removed, the filter part 500 is taken out and cleaned, and after the cleaning, the filter part 500 is inserted into the locking groove 434 again for the next use.

Further, the cover 440 is provided with two indication marks 441, and the two indication marks 441 respectively correspond to the material suction nozzle 432 and the material discharge nozzle 433, so that a user can visually identify the material suction nozzle 432 and the material discharge nozzle 433.

As shown in fig. 5, in some embodiments of the present invention, in order to facilitate maintenance or repair of the pump assembly 400, the housing 210 includes a housing 211 and a movable cover 212, the housing 211 is connected to the rotary driving apparatus 100, and the movable cover 212 is detachably connected to the housing 211 by a connection bolt. Before maintenance or repair of the pump assembly 400, the movable cover 212 is removed, and then the cover 440 and the valve plate 430 are removed in sequence.

In some embodiments of the present invention, in order to ensure the accurate installation of the sealing cover 440 and the valve plate 430, the sealing cover 440 is provided with a plurality of positioning posts (not shown in the drawings), the valve plate 430 is provided with a plurality of positioning holes 435, and all the positioning posts and all the positioning holes 435 are respectively arranged in a one-to-one correspondence.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. A micropump, comprising:

the rotary driving device (100) is provided with a rotating shaft (110), and the rotating shaft (110) is synchronously connected with an eccentric wheel (300);

a pump body (200) comprising a housing (210) and a pump assembly (400), wherein the housing (210) is connected to the rotary driving device (100), the pump assembly (400) comprises a piston rod (410), a cup (420), a valve plate (430) and a sealing cover (440), one end of the piston rod (410) is rotatably connected to the eccentric wheel (300), the piston rod (410) is provided with a first mounting hole (412), a nut portion (413) is installed in the first mounting hole (412), the cup (420) is provided with a second mounting hole (422), and a screw portion (423) which can be in threaded connection with the nut portion (413) is installed on the second mounting hole (422), so that the other end of the piston rod (410) can be detachably connected to the cup (420); the packing cup (420) is connected with the valve plate (430) in a sealing mode, so that a variable volume cavity (401) is formed between the packing cup (420) and the valve plate (430), the second mounting hole (422) is not communicated with the variable volume cavity (401), the shell (210), the valve plate (430) and the sealing cover (440) are sequentially connected, the valve plate (430) and the sealing cover (440) are jointly provided with an inflow channel (402) and an outflow channel (403), the inflow channel (402) and the outflow channel (403) are respectively communicated with the variable volume cavity (401) in a one-way mode, the inflow channel (402) is communicated with the variable volume cavity (401), and the variable volume cavity (401) is communicated with the outflow channel (403).

2. A micropump according to claim 1, wherein: the outer peripheral surface of the nut part (413) is provided with first anti-slip teeth (4131), and the inner wall of the first mounting hole (412) is provided with first teeth (4121) matched with the first anti-slip teeth (4131); the outer peripheral surface of the screw rod part (423) is provided with a second anti-skid tooth (4231), and the inner wall of the second mounting hole (422) is provided with a second tooth (4221) matched with the structure of the second anti-skid tooth (4231).

3. A micropump according to claim 1, wherein: a bearing (411) is installed at one end of the piston rod (410), and the piston rod (410) is rotatably connected with the eccentric wheel (300) through the bearing (411).

4. A micropump according to claim 1, wherein: the eccentric wheel (300) is connected with a balancing weight (320) used for enabling the eccentric wheel (300) to achieve static balance.

5. A micropump according to claim 1, wherein: the valve plate (430) is provided with a material suction nozzle (432) and a material discharge nozzle (433), and the material suction nozzle (432) and the material discharge nozzle (433) are respectively communicated with the inflow channel (402) and the outflow channel (403).

6. A micropump according to claim 5, wherein: a filtering part (500) is arranged between the discharge nozzle (433) and the outflow channel (403).

7. A micropump according to claim 5, wherein: the sealing cover (440) is provided with two indicating marks (441), and the two indicating marks (441) respectively correspond to the material suction nozzle (432) and the material discharge nozzle (433).

8. A micropump according to claim 1, wherein: the shell (210) comprises a shell frame (211) and a movable cover (212), the shell frame (211) is connected with the rotary driving device (100), and the movable cover (212) is detachably connected with the shell frame (211).

9. A micropump according to claim 1, wherein: the sealing cover (440) is provided with a plurality of positioning columns, the valve plate (430) is provided with a plurality of positioning holes (435), and all the positioning columns and all the positioning holes (435) are arranged in a one-to-one correspondence mode respectively.

10. A micropump according to claim 1, wherein: the rotary drive device (100) is an electric motor or a pneumatic motor.