CN210859088U

CN210859088U - Miniature electromagnetic oscillation non-return pump

Info

Publication number: CN210859088U
Application number: CN201921432894.6U
Authority: CN
Inventors: 赵蔚; 赵翔; 史晓光
Original assignee: Individual
Current assignee: Nanjing Tianheng Automation Control Technology Co.,Ltd.
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-06-26
Anticipated expiration: 2029-08-30

Abstract

The utility model discloses a miniature electromagnetic oscillation non-return pump, which comprises an outer cylinder and a lower end cover, wherein a coil framework and a permanent magnet are arranged in the outer cylinder; a first shaft sleeve is arranged at the center of the coil framework, the first shaft sleeve is provided with an installation cavity, and a first one-way valve is installed in the installation cavity; a mandrel is arranged between the first shaft sleeve and the lower end cover, a convex block is arranged on the outer surface of the mandrel, and a first spring and a second spring are sleeved outside the mandrels on the two sides of the convex block respectively; the upper end of the mandrel is arranged in the mounting cavity through a first sliding bearing, and the lower end of the mandrel is arranged on the lower end cover through a second sliding bearing; the mandrel is provided with a hollow cavity, and a second one-way valve is arranged in the cavity; a water outlet is arranged outside the lower end cover and is communicated with the cavity channel, and a third one-way valve is arranged at the water outlet; a cylinder cover is arranged outside the outer cylinder and the lower end cover, the cylinder cover is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the mounting cavity, and the liquid outlet is communicated with the liquid outlet pipe through a third one-way valve; the utility model discloses the part is integrated integrative, has constant current, constant voltage, non return pressurize, longe-lived characteristics.

Description

Miniature electromagnetic oscillation non-return pump

Technical Field

The utility model relates to a miniature electromagnetic oscillation non return pump (hydraulic pump) is applicable to among the hydraulic system environment and various small-size, miniature precision instruments, the hydraulic means of accurate control.

Background

In a conventional reciprocating pump, a set of mechanism is used to convert the rotary motion of a motor into a reciprocating linear motion for driving a plunger, such as a crank-link mechanism, a cam mechanism, etc. These mechanisms are bulky and complex. The electromagnetic pump is a microminiature pump which directly combines an electromagnetic coil and a plunger into a whole, and the pump is small in size, convenient to install and beneficial to system miniaturization. The linear electromagnetic oscillating pump is one of electromagnetic pumps, and is widely applied to various metering pumps, spray humidifiers, medical treatment, trace circulating liquid, cooling systems, constant temperature circulators, constant temperature tanks, airplane oil supply lubricating systems, laser cooling systems, vacuum cooling systems, kidney dialyzers, medical experimental devices, heating and ventilation electric hydraulic actuators and the like. An electromagnetic oscillating pump disclosed in patent document CN105221406A, includes: a valve body provided with a central hole; the pressure relief valve is arranged in the central hole; the plunger comprises a plunger head arranged in the central hole, the end part of the free end of the plunger head is provided with a sealing element, the sealing element is pressed against the hole wall of the central hole, and the sealing element and the plunger head can synchronously move along the axial direction of the central hole; the water suction valve is arranged on the plunger head and is opposite to the pressure release valve; wherein, relief valve, valve body, plunger head, sealing member and water sucking valve form sealed space. The working principle of the electromagnetic oscillating pump is as follows: when the electromagnetic coil is electrified, the plunger 13 moves rightwards under the action of the electromagnetic force, the return spring 14 is compressed, the volume in the pump volume cavity is increased, the pressure is reduced, the one-way ball valve 24 is closed, the valve core 25 is separated from the plunger 13, and a medium flows into and fills the volume cavity; after the plunger 13 reaches the right-pole position, the electromagnetic force is reduced from the peak value, the plunger 13 moves leftwards under the action of the return spring 14, the valve core 25 is closed, the volume of the volume cavity is reduced, the pressure is increased, the one-way ball valve 24 is opened, and the medium flows out from the water outlet: then under the action of electromagnetic force, the plunger 13 moves leftwards from the right limit position, and the medium flows out continuously from the water outlet in a repeated motion.

However, the electromagnetic pump currently used has no mature and stable product to meet the requirements of a miniature hydraulic pump source for stopping and maintaining pressure and maintaining a timely state, and the defects of low output pressure and small flow rate are caused by the structure and the volume in practical application.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a miniature electromagnetic oscillation non return pump of miniaturation, constant pressure, constant flow, ability non return pressurize, overlength life is provided.

In order to solve the technical problem, the utility model discloses miniature electromagnetic oscillation non return pump includes urceolus and lower end cover, the lower end cover is installed in the urceolus below, be provided with coil skeleton and permanent magnet (annular) in the urceolus, coil skeleton, permanent magnet distribute from top to bottom, the last coil of installing of coil skeleton is provided with the coil cover outside the coil skeleton.

A first shaft sleeve is arranged in the center of the coil framework, the upper end of the first shaft sleeve extends out of the outer cylinder, and an installation cavity is formed in the first shaft sleeve; and a first one-way valve is arranged at the upper end of the first shaft sleeve in the mounting cavity.

The first one-way valve comprises an upper shaft sleeve and a lower shaft sleeve, the upper shaft sleeve is provided with a first flow passage, and the lower shaft sleeve is communicated with the installation cavity; the lower shaft sleeve is internally provided with a first valve core and a first valve core spring, the first valve core and the first valve core spring are arranged up and down, and the first valve core spring supports the first valve core to block the first flow passage.

A mandrel is arranged between the first shaft sleeve and the lower end cover and penetrates through the permanent magnet; the outer surface of the mandrel is provided with a convex block, and a first spring and a second spring are sleeved outside the mandrel respectively on two sides of the convex block; the upper end of the mandrel is installed in the installation cavity through a first sliding bearing, and the first spring is located between the bump and the first sliding bearing; the lower end of the mandrel is mounted on the lower end cover through a second sliding bearing, and the second spring is positioned between the lug and the lower end cover; the mandrel is provided with a hollow cavity, and a second one-way valve is arranged in the cavity. And a movable shaft sleeve is arranged outside the bump, the movable shaft sleeve penetrates through the permanent magnet, and the first spring and the second spring are positioned between the mandrel and the movable shaft sleeve.

The second one-way valve comprises a second valve core, a second valve core spring, a first convex ring and a second convex ring, the first convex ring and the second convex ring are arranged on the inner wall of the cavity, the second valve core and the second valve core spring are arranged between the first convex ring and the second convex ring, the second valve core and the second valve core spring are arranged up and down, and the second valve core spring supports the second valve core to block the first convex ring. The second valve core is tubular with a closed top end, an outer convex ring is arranged outside the second valve core, a third convex ring is arranged between the first convex ring and the second convex ring, and the first convex ring and the third convex ring limit the second valve core to move between the first convex ring and the third convex ring through limiting the outer convex ring. And a liquid inlet hole is formed in the side surface of the upper part of the second valve core and communicated with the central hole of the second valve core.

A water outlet is formed in the lower end cover and is communicated with the cavity, and a third one-way valve is arranged at the water outlet; specifically, a liquid outlet pipe (a water outlet is communicated with the liquid outlet pipe) can be arranged outside the lower end cover, the liquid outlet pipe is communicated with the cavity channel, and a third one-way valve is arranged on the liquid outlet pipe, namely the third one-way valve is arranged through the liquid outlet pipe. An inner shaft ring is arranged in the lower end cover, and the second spring is positioned in the inner shaft ring.

The third one-way valve comprises a third valve core and an installation core, the installation core is installed at the water outlet, specifically, the installation core is sleeved at the end part of the liquid outlet pipe outside the water outlet, the installation core is provided with a third flow channel, and the third flow channel is communicated with the liquid outlet pipe; the third valve core is supported by blades and can be movably arranged below the third flow channel up and down, and the blades are arranged on the mounting core.

The outer cylinder cover is arranged outside the outer cylinder and the lower end cover, a liquid inlet and a liquid outlet are arranged on the cylinder cover, the liquid inlet is communicated with the installation cavity, and the liquid outlet is communicated with the liquid outlet pipe through a third one-way valve. Specifically, the cylinder cap comprises upper cylinder cap and lower cylinder cap, the inlet is installed on the upper cylinder cap, the liquid outlet is installed on the lower cylinder cap.

In order to fix and seal the liquid outlet, a fixed shaft sleeve is arranged outside the liquid outlet pipe and the third one-way valve in the cylinder cover, and one or more sealing rings are arranged between the fixed shaft sleeve and the liquid outlet pipe and between the fixed shaft sleeve and the third one-way valve.

The utility model discloses the principle is: after the power is switched on, the electromagnetic coil generates an alternating magnetic field under the action of alternating current, so that the magnetic polarity generated by the coil winding is the same as or opposite to that of the permanent magnet (annular magnetic steel), and the mandrel does reciprocating oscillation motion.

When the pump is powered on, the electromagnetic coil generates an alternating magnetic field under the action of alternating current, and when the polarity generated by the coil winding is the same as that of the permanent magnet, the upward synthetic thrust is generated under the combined action of the magnetic pole and the permanent magnet. The resultant thrust overcomes spring force, friction, etc., causing the mover to move upward. When the electromagnetic force is weakened to overcome the compressed spring force, the spring force interacts with the permanent magnet to generate a downward thrust, so that the mover moves downward. The permanent magnet imparts a force to the plunger of the mover, whether moving up or down, which, when decomposed, generates an axial force and a radial force on the plunger. The axial force participates in the reciprocating motion of the plunger of the rotor, and the radial force enables the plunger to be suspended in the permanent magnet and not to incline, so that the friction contact of the plunger is reduced. When the plunger of the rotor moves rightwards, the volume of the working cavity is increased, the pressure in the cavity is smaller than the pressure at the inlet of the pump, and oil flows into the working cavity; when the rotor moves leftwards, the volume of the working cavity is reduced, the pressure of oil in the cavity is greater than the pressure at the outlet of the pump, and the oil is discharged through the outlet of the plunger. Therefore, when sine alternating current is introduced, sine alternating thrust generated by the pump enables the plunger of the rotor to reciprocate, and oil is continuously sucked and discharged.

The permanent magnet imparts an axial force and a radial force to the spindle whether the spindle is moving up or down. The axial force participates in the reciprocating motion of the mandrel, the radial force suspends the mandrel in the permanent magnet, and the plunger is approximately frictionless by neglecting the tiny additional radial force. Thereby greatly prolonging the service life of the pump.

The mandrel is suspended, and the friction is almost zero, so that the service life of the pump is greatly prolonged. The principle of the mandrel suspension is as follows: the mandrel and the sliding bearing are in clearance (suspended in the clearance) fit, the clearance cannot cause abrasion of the mandrel and the bearing, even the mandrel and the bearing are clamped, and the reverse leakage of oil cannot be caused, so that the pressure of the pump cannot be increased and the flow cannot be unstable.

When the mandrel moves downwards, the volume (the volume of the installation cavity) is increased, and compared with the pump, negative pressure is formed, liquid (such as oil) is sucked into the installation cavity (also called a working cavity) through the first one-way valve (in a flow guiding state), and at the moment, the second one-way valve and the third one-way valve are stopped (namely closed). When the mandrel moves upwards, the volume of the installation cavity is reduced, positive pressure is formed in the cavity, the first one-way valve is stopped, liquid breaks through the second one-way valve and the third one-way valve, the second one-way valve and the third one-way valve are communicated, the liquid is discharged through the liquid outlet, and the discharged liquid enters the hydraulic system. When the liquid is discharged, namely the mandrel moves upwards, due to the action (cut-off) of the first one-way valve, the pressure in the pump body (particularly in the installation cavity and the cavity channel) cannot be discharged out of the pump body, if the pressure is discharged into a hydraulic system, the pressure loss (low output pressure and small flow) cannot be caused, the pressure of the pump body external system (such as the hydraulic system) cannot be disturbed (the pressure of the pump body external system is suddenly reduced), and constant flow and constant pressure are ensured. Even guarantee that liquid reverse flow also can not follow the oil inlet and flow out, initial pressure value when such device ensured the pump and pumped, and then guarantee stable high pressure and output flow.

When the pressure of the system outside the pump body is higher than the outlet pressure of the pump, or when the system is powered off, and the mandrel is in a stop state, the traditional electromagnetic pump can not return, can not continuously maintain the real-time balance state of the system to realize the balance pressure maintaining, or can be realized by additionally arranging a pressure maintaining loop. And the utility model discloses a first check valve, second check valve and third check valve subassembly in the cylinder cap, the three closely combines as an organic wholely for pressure in the external system of pump (like hydraulic system) still accurately keeps unchangeable, plays the non return pressurize effect between pump source and system. Simultaneously, this kind of highly concentrated, compact design makes the utility model discloses miniaturized, high performance's target can be realized. The mandrel does reciprocating oscillating motion in cycles to realize the liquid delivery.

When the mandrel moves upwards, the volume of the installation cavity is reduced, liquid is pressurized and passes through the second one-way valve, meanwhile, the volume of the liquid outlet pipe cavity is increased, and the liquid passing through the first one-way valve flows into and fills the liquid outlet pipe; when the mandrel moves downwards, the volume of the installation cavity is increased, and liquid enters the installation cavity through the first one-way valve. The volume of the liquid outlet pipe is reduced, the third one-way valve is closed, so that the pressure of the liquid outlet pipe can be kept unchanged, the pressure in the cavity of the liquid outlet pipe is increased, and liquid rushes the third one-way valve to enter the system. At the moment, the pressure at the outlet of the pump is the sum of the liquid pressure in the mounting cavity and the pressure in the liquid outlet pipe cavity. Within the rated flow range (the flow range that the piston can produce), the electromagnetic oscillation non-return pump of the utility model is a constant displacement pump with the flow not changing along with the system pressure. The function of the third one-way valve has the functions of non-return and pressure maintaining and also has the function of energy storage and pressurization of the pump.

The utility model discloses a miniature electromagnetic oscillation non return pump has utilized the theory of the basis of sharp electromagnetic oscillation pump, and the part is integrated integrative, has constant current, constant voltage, non return pressurize, longe-lived characteristics.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is an explosion diagram of the present invention.

Fig. 2 is a sectional perspective view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is a schematic view of a first one-way valve.

Fig. 5 is a schematic view of a second one-way valve.

Detailed Description

As shown in fig. 1 to 5, the micro electromagnetic oscillation check pump includes an outer cylinder 6 and a lower end cap 7, and the lower end cap 7 is installed below the outer cylinder 6. And a cylinder cover is arranged outside the outer cylinder 6 and the lower end cover 7 and consists of an upper cylinder cover 1 and a lower cylinder cover 3, a liquid inlet 2 is arranged on the upper cylinder cover 1, and a liquid outlet 4 is arranged on the lower cylinder cover 3.

Be provided with coil skeleton 8 and permanent magnet 15 in the urceolus 6, coil skeleton 8, permanent magnet 15 distribute from top to bottom (select annular magnet steel), install the coil on the coil skeleton 8, coil skeleton 8 is provided with coil cover 9 outward, and the power cord 23 of coil is worn out from coil cover 9, urceolus 6, last cylinder cap 1, and on last cylinder cap 1, power cord 23 passes through nut 22 fixedly.

The coil framework 8 is provided with a first shaft sleeve 10 at the center, the upper end of the first shaft sleeve 10 extends out of the outer cylinder 6 (specifically, the first shaft sleeve 10 penetrates through the center of the upper top surface of the outer cylinder 6), and the first shaft sleeve 10 is internally provided with a mounting cavity 44. At the upper end of the first shaft sleeve 10, a first one-way valve is installed in the installation cavity 44. As shown in fig. 4, the first check valve includes an upper bushing 29 and a lower bushing 31, the upper bushing 29 is provided with a first flow passage 30, and the first flow passage 30 communicates with the upper intake port 2 of the upper cylinder head 1. The lower boss 31 communicates with the mounting chamber 44, and specifically, the lower boss 31 is provided with a hole 24 (shown in fig. 2). A first valve core 32 (steel ball or other shape component is selected, as long as the first valve core spring 33 can block the first flow channel 30) and a first valve core spring 33 are arranged in the lower shaft sleeve 31, the first valve core 32 and the first valve core spring 33 are arranged up and down, and the first valve core spring 3332 supports the first valve core 32 to block the first flow channel 30. When the first flow passage 30 has liquid pressure (or other air pressure) and the pressure is greater than the supporting force of the first valve core spring 33, the first valve core 32 cannot continuously block the first flow passage 30, the liquid in the first flow passage 30 can flow into the lower shaft sleeve 31, and the liquid flows into the mounting cavity 44 due to the communication between the lower shaft sleeve 31 and the mounting cavity 44 (through the upper hole 24 of the lower shaft sleeve 31), and then enters the hollow cavity 45 of the spindle 11. When the liquid flows in the reverse direction, the first spool 32 blocks the first flow passage 30 at the port of the first flow passage 30 due to the supporting force of the first spool spring 33, that is, the first check valve is stopped.

A mandrel 11 (also called a plunger) is arranged between the first shaft sleeve 10 and the lower end cover 7, and the mandrel 11 penetrates through a permanent magnet 15. Specifically, the upper portion of the spindle 11 is disposed in the first boss 10, and the lower portion of the spindle 11 passes through the permanent magnet 15. The upper end of the mandrel 11 is installed in the installation cavity through a first sliding bearing 46, and the lower end of the mandrel 11 is installed on the lower end cover 7 through a second sliding bearing 47.

The outer surface of the mandrel 11 is provided with a bump 42, a first spring 13 and a second spring 14 are respectively sleeved outside the mandrel 11 on two sides of the bump 42, the first spring 13 is positioned between the bump 42 and a first sliding bearing 46, and the second spring 14 is positioned between the bump 42 and the lower end cover 7. The lug 42 is externally provided with a movable shaft sleeve 12, the movable shaft sleeve 12 penetrates through the permanent magnet 15, and the first spring 13 and the second spring 14 are positioned between the mandrel 11 and the movable shaft sleeve 12.

The mandrel 11 is provided with a hollow cavity, and a second one-way valve is arranged in the cavity. As shown in fig. 5, the second check valve includes a second valve core 34, a second valve core spring 35, a first convex ring 37 and a second convex ring 40, the first convex ring 37 and the second convex ring 40 are disposed on the inner wall of the cavity, the second valve core 34 and the second valve core spring 35 are installed between the first convex ring 37 and the second convex ring 40, the second valve core 34 and the second valve core spring 35 are disposed up and down, and the second valve core spring 35 supports the second valve core 34 to block the first convex ring 37. When the liquid pressure (or other air pressure) exists in the cavity and the pressure is greater than the supporting force of the second valve core spring 35, the second valve core 34 cannot continuously block the cavity, and the liquid in the cavity can continuously flow downwards through the first convex ring 37 and then enter the hollow cavity of the mandrel 11 below the first convex ring 37. When the liquid flows reversely, the second valve core 34 will block at the first convex ring 37, namely block the cavity channel, due to the supporting force of the second valve core spring 35, and the second one-way valve is stopped.

The second valve core 34 is tubular with a closed top end, an outer convex ring 39 is arranged outside the second valve core 34, a third convex ring 41 is arranged between the first convex ring 37 and the second convex ring 40, and the first convex ring 37 and the third convex ring 41 limit the second valve core 37 to move between the first convex ring 37 and the third convex ring 41 by limiting the outer convex ring 39. The second valve core 37 moves upward, the top end of the second valve core is in contact with the first convex ring 37 to close the cavity, the second valve core 34 breaks through the supporting force of the second valve core spring 35 and moves downward, the top end of the second valve core spring is separated from the first convex ring 37, and the liquid in the cavity flows through the first convex ring 37. The upper side of the second valve core 34 is provided with an inlet hole 38, and the inlet hole 38 is communicated with the central hole 43 of the second valve core 34. After flowing through the first convex ring 37, the liquid in the cavity can flow into the cavity below the first convex ring 37 through the liquid inlet hole 38 and the central hole 43 of the second valve core 34.

The lower end cover 7 is provided with a water outlet which is communicated with the cavity, and the water outlet is provided with a third one-way valve. Specifically, a liquid outlet pipe 17 is arranged outside the lower end cover 7, the water outlet is communicated with the liquid outlet pipe, the liquid outlet pipe 17 is communicated with the cavity, a third one-way valve is arranged on the liquid outlet pipe 17, and the liquid outlet pipe 17 is communicated with the liquid outlet 4 through the third one-way valve. The lower end cap 7 has an inner collar 16, and the second spring 14 is located in the inner collar 16. The inner shaft ring 16, the liquid outlet pipe 17 and the lower end cover 7 form a whole.

The third one-way valve comprises a third valve element 28 (steel balls or other parts with other shapes are selected as long as the third flow channel can be blocked) and an installation element 19, the installation element 19 is installed at the water outlet, specifically, the installation element 19 is sleeved at the end part of the liquid outlet pipe 17 outside the water outlet, the installation element 19 is provided with a third flow channel, and the third flow channel is communicated with the liquid outlet pipe 17; the third valve body 28 is supported by the vanes 20 and is mounted below the third flow path so as to be movable up and down, and the vanes 20 are mounted on the mounting core 19 via the housing 21.

In order to fix and seal the liquid outlet 4, in the cylinder cover, a fixed shaft sleeve 18 is arranged outside the liquid outlet pipe 17 and the third one-way valve, a sealing ring is arranged between the fixed shaft sleeve 18 and the liquid outlet pipe 17 and between the fixed shaft sleeve 18 and the third one-way valve for sealing, specifically, a first sealing ring 25 is arranged between the liquid outlet pipe 17 and the fixed shaft sleeve 18, and a second sealing ring 26 is arranged between the mounting core 19 and the fixed shaft sleeve 18. Meanwhile, a third seal ring 27 is provided between the fixed boss 18 and the lower cylinder head 3.

When the magnetic core is used, the electromagnetic coil generates an alternating magnetic field under the action of alternating current after being electrified, so that the magnetic polarity generated by the coil winding is the same as or opposite to that of the permanent magnet (annular magnetic steel), and the core shaft makes reciprocating oscillating motion. When the mandrel 11 moves downwards, the volume (the volume of the installation cavity) is increased, and compared with the pump, negative pressure is formed, at the moment, the second one-way valve and the third one-way valve are stopped (namely closed), and liquid (such as oil) is sucked into the installation cavity (also called as a working cavity) through the first one-way valve (in a flow guiding state). When the mandrel 11 moves upwards, the volume of the installation cavity is reduced, positive pressure is formed in the cavity, the first one-way valve is stopped, liquid breaks through the second one-way valve and the third one-way valve, the second one-way valve and the third one-way valve are conducted, and the liquid is discharged through the liquid outlet 4 and enters a hydraulic system after being discharged. The liquid is conveyed in a circulating way.

The above-mentioned embodiment does not limit the utility model in any way, and all the technical solutions that adopt the mode of equivalent replacement or equivalent transform to obtain all fall within the protection scope of the utility model.

Claims

1. A miniature electromagnetic oscillation non-return pump is characterized by comprising an outer barrel and a lower end cover, wherein the lower end cover is arranged below the outer barrel, a coil framework and a permanent magnet are arranged in the outer barrel, the coil framework and the permanent magnet are vertically distributed, a coil is arranged on the coil framework, and a coil cover is arranged outside the coil framework; a first shaft sleeve is arranged in the center of the coil framework, the upper end of the first shaft sleeve extends out of the outer cylinder, and an installation cavity is formed in the first shaft sleeve; a first one-way valve is arranged in the mounting cavity at the upper end of the first shaft sleeve; a mandrel is arranged between the first shaft sleeve and the lower end cover and penetrates through the permanent magnet; the outer surface of the mandrel is provided with a convex block, and a first spring and a second spring are sleeved outside the mandrel respectively on two sides of the convex block; the upper end of the mandrel is installed in the installation cavity through a first sliding bearing, and the first spring is located between the bump and the first sliding bearing; the lower end of the mandrel is mounted on the lower end cover through a second sliding bearing, and the second spring is positioned between the lug and the lower end cover; the mandrel is provided with a hollow cavity, and a second one-way valve is arranged in the cavity; a water outlet is formed in the lower end cover and is communicated with the cavity, and a third one-way valve is arranged at the water outlet; the outer cylinder cover is arranged outside the outer cylinder and the lower end cover, a liquid inlet and a liquid outlet are arranged on the cylinder cover, the liquid inlet is communicated with the installation cavity, and the liquid outlet is communicated with the liquid outlet pipe through a third one-way valve.

2. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: the cylinder cap comprises last cylinder cap and lower cylinder cap, the inlet is installed on last cylinder cap, the liquid outlet is installed on lower cylinder cap.

3. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: and a movable shaft sleeve is arranged outside the bump, the movable shaft sleeve penetrates through the permanent magnet, and the first spring and the second spring are positioned between the mandrel and the movable shaft sleeve.

4. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: in the cylinder cover, a fixed shaft sleeve is arranged outside the liquid outlet pipe and the third one-way valve, and one or more sealing rings are arranged between the fixed shaft sleeve and the liquid outlet pipe and between the fixed shaft sleeve and the third one-way valve.

5. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: an inner shaft ring is arranged in the lower end cover, and the second spring is positioned in the inner shaft ring.

6. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: the first one-way valve comprises an upper shaft sleeve and a lower shaft sleeve, the upper shaft sleeve is provided with a first flow passage, and the lower shaft sleeve is communicated with the installation cavity; the lower shaft sleeve is internally provided with a first valve core and a first valve core spring, the first valve core and the first valve core spring are arranged up and down, and the first valve core spring supports the first valve core to block the first flow passage.

7. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: the second one-way valve comprises a second valve core, a second valve core spring, a first convex ring and a second convex ring, the first convex ring and the second convex ring are arranged on the inner wall of the cavity, the second valve core and the second valve core spring are arranged between the first convex ring and the second convex ring, the second valve core and the second valve core spring are arranged up and down, and the second valve core spring supports the second valve core to block the first convex ring.

8. The micro electromagnetic oscillating check pump of claim 7, wherein: the second valve core is tubular with a closed top end, an outer convex ring is arranged outside the second valve core, a third convex ring is arranged between the first convex ring and the second convex ring, and the first convex ring and the third convex ring limit the second valve core to move between the first convex ring and the third convex ring through limiting the outer convex ring.

9. A miniature electromagnetic oscillating check pump as set forth in claim 8, wherein: and a liquid inlet hole is formed in the side surface of the upper part of the second valve core and communicated with the central hole of the second valve core.

10. A miniature electromagnetic oscillating check pump as set forth in claim 1, wherein: the third one-way valve comprises a third valve core and an installation core, the installation core is installed at the water outlet, the installation core is provided with a third flow passage, and the third flow passage is communicated with the water outlet; the third valve core is supported by blades and can be movably arranged below the third flow channel up and down, and the blades are arranged on the mounting core.