CN210164597U

CN210164597U - Double-stage reciprocating electric vacuum pump

Info

Publication number: CN210164597U
Application number: CN201920298155.6U
Authority: CN
Inventors: 梁煜欣; 王立标
Original assignee: Taizhou University
Current assignee: Taizhou University
Priority date: 2019-03-09
Filing date: 2019-03-09
Publication date: 2020-03-20
Anticipated expiration: 2029-03-09

Abstract

The utility model discloses a two-stage reciprocating electric vacuum pump, which aims to overcome the problems of low transmission efficiency, large working noise and poor heat dissipation in the prior art and comprises two air exhaust mechanisms, wherein each air exhaust mechanism comprises a cylinder body, an eccentric wheel, a bearing, a connecting rod and a piston, the cylinder body is fixedly arranged at one side of a double-shaft stretching motor, the piston is hermetically arranged in the cylinder body, one end of the connecting rod is hinged on the piston, the other end of the connecting rod is sleeved on the bearing, the bearing is sleeved on the eccentric wheel, the eccentric wheel is fixedly arranged on an output shaft of the double-shaft stretching motor, the eccentric wheel can drive the piston to slide in the cylinder body in a reciprocating manner, the cylinder body is provided with an air inlet hole and an air outlet hole, the air inlet hole is provided with an air inlet check valve, the air outlet hole is provided with an air outlet check valve, the cylinder body is provided with a top cover, a partition plate, the top cover is provided with a plurality of rib plates.

Description

Double-stage reciprocating electric vacuum pump

Technical Field

The utility model belongs to the technical field of the vacuum pump, refer in particular to a reciprocating type electric vacuum pump of doublestage.

Background

The vacuum pump is a device for obtaining vacuum by pumping a pumped container by using mechanical, physical and other methods, has the advantages of large vacuum degree, high pumping efficiency, normal work in poor environment and the like, has higher reliability, and is widely applied to the fields of petroleum, chemical industry, medicine, metallurgy, electricity, aerospace models and the like.

Among them, a reciprocating vacuum pump is also called a piston vacuum pump, and the piston vacuum pump includes a pump body and a motor for driving the pump body. The pump body includes the shell and sets up cylinder, piston connecting rod together in the shell, fixedly on the shell be provided with the valve plate, is equipped with valve opening and changeable valve on the valve plate, thereby atmospheric pressure can order about the valve to open the valve opening when the piston slides up and down in the cylinder.

Vacuum pump among the prior art often adopts the crank to drive the piston connecting rod, drives piston reciprocating motion by the piston connecting rod again, and it has simple structure, easy advantage of realizing, but has easy damage at crank and piston connecting rod junction, and this just leads to the problem that transmission efficiency is low, noise at work is big to piston motion leads to vacuum pump temperature sharply to rise easily at the during operation, and current vacuum pump radiating effect is unsatisfactory.

SUMMERY OF THE UTILITY MODEL

For overcoming the not enough and problem that exists of prior art, the utility model provides a two-stage reciprocating electric vacuum pump that transmission efficiency is high, noise at work is little, the heat dissipation is fast.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a two-stage reciprocating electric vacuum pump comprises a double-shaft extension motor, two air exhaust mechanisms and two air vent pipes, wherein each air exhaust mechanism comprises a cylinder body, an eccentric wheel, a bearing, a connecting rod and a piston, the cylinder body is fixedly arranged on one side of the double-shaft extension motor, the piston is hermetically arranged in the cylinder body, one end of the connecting rod is hinged to the piston, the other end of the connecting rod is sleeved on the bearing, the bearing is sleeved on the eccentric wheel, the eccentric wheel is fixedly arranged on an output shaft of the double-shaft extension motor, the eccentric wheel can drive the piston to slide in the cylinder body in a reciprocating manner, an air inlet hole and an air vent hole are formed in the cylinder body, an air inlet check valve of a one-way sealing air inlet hole is arranged on the air inlet hole, an air vent check valve of a one-way sealing air vent hole is arranged on the air vent hole, the air inlet hole and the air release hole on one cylinder body are respectively communicated with the air inlet hole and the air release hole of the other cylinder body through two vent pipes, the top cover is also provided with a first hole communicated with the air inlet hole and a second hole communicated with the air release hole, and a plurality of rib plates are formed on the top cover.

After adopting the structure, the output shaft of the double-shaft extension motor rotates to drive the eccentric wheel to do circular motion around the output shaft, the eccentric wheel drives the connecting rod to do reciprocating motion through the bearing, the connecting rod drives the piston to do reciprocating motion in the cylinder sleeve, the bearing is adopted to drive between the eccentric wheel and the connecting rod, the friction coefficient of the bearing in the transmission process is ensured to be reduced, the whole service life of the part is prolonged, the rotary precision is ensured, and the high-efficiency transmission motion is facilitated Low working noise and quick heat dissipation.

Preferably, the cylinder body comprises a cylinder base, a cylinder sleeve and a gas valve body pressing plate, the cylinder base, the cylinder sleeve, the gas valve body pressing plate and the top cover are sequentially fixed together from bottom to top, the cylinder base is fixedly arranged on one side of the double-shaft stretching motor, the eccentric wheel and the bearing are arranged in the cylinder base, the piston is slidably arranged in the cylinder sleeve, and the gas inlet hole and the gas release hole are formed in the gas valve body pressing plate.

After adopting above-mentioned structure, cylinder base, cylinder liner, air valve body clamp plate and top cap are together fixed in proper order from bottom to top, and eccentric wheel, bearing are installed in the cylinder base, and the piston is installed in the cylinder liner, and the check valve that admits air, the check valve that deflates are installed on the air valve body clamp plate, therefore this two-stage reciprocating type electric vacuum pump has structural design rationally, assembles convenient advantage.

Preferably, the cylinder block further includes a side cover, the cylinder block is provided with an operation opening facing the bearing, and the side cover is provided on the operation opening.

After adopting above-mentioned structure, need maintain in the bearing use and improve life, and user's accessible operation mouth maintains the bearing, consequently this doublestage reciprocating type electric vacuum pump has the advantage of maintaining convenience, structural design is reasonable.

Preferably, the air release check valve and the piston are arranged on two sides of the air release hole, and the air inlet check valve and the piston are arranged on the same side of the air inlet hole.

Preferably, the eccentric wheel is provided with a shaft hole, and an output shaft of the double-shaft extension motor is in interference fit in the shaft hole.

Preferably, the surface of the vent pipe is plated with color zinc.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic diagram of the explosion structure of the present invention;

fig. 3 is a schematic sectional structure of the present invention;

FIG. 4 is an exploded view of the pumping mechanism of the present invention;

in the figure: 1-double-shaft extension motor, 2-air suction mechanism, 3-vent pipe, 4-air inlet one-way valve, 5-air outlet one-way valve, 11-output shaft, 21-eccentric wheel, 22-bearing, 23-connecting rod, 24-piston, 25-top cover, 26-cylinder seat, 27-cylinder sleeve, 28-air valve body pressure plate, 29-side cover, 211-shaft hole, 251-clapboard, 252-ribbed plate, 253-first hole, 254-second hole, 261-operation port, 281-air inlet hole and 282-air outlet hole.

Detailed Description

To facilitate understanding of those skilled in the art, the present invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 4, a two-stage reciprocating electric vacuum pump includes a dual-axis motor 1, two pumping mechanisms 2, and two air pipes 3, wherein the two pumping mechanisms 2 are respectively disposed at two sides of the dual-axis motor 1, two ends of the dual-axis motor 1 are respectively provided with output shafts 11 extending outward, and the two output shafts 11 respectively extend into the corresponding pumping mechanisms 2 and drive the corresponding pumping mechanisms 2 to operate. The vent pipe 3 is connected between the two air exhaust mechanisms 2, thereby realizing air circulation between the two air exhaust mechanisms 2. When the present two-stage reciprocating electric vacuum pump is applied to a container to be evacuated for providing vacuum assist, the evacuation mechanism 2 evacuates air from the container to be evacuated and discharges the air to the outside. The two air extraction mechanisms 2 have the same structure, and a specific structure of one air extraction mechanism 2 will be described below.

The air exhaust mechanism 2 comprises a cylinder body, an eccentric wheel 21, a bearing 22, a connecting rod 23 and a piston 24, wherein the cylinder body is fixedly arranged on one side of the double-shaft stretching motor 1, and specifically, the cylinder body is vertically arranged on one side of the double-shaft stretching motor 1.

The piston 24 is hermetically arranged in the cylinder body, and the piston 24 can vertically slide in the cylinder body, so that the problem that the friction of the piston 24 is uneven due to self-weight droop is avoided, the abrasion of moving parts such as the piston 24 and the connecting rod 23 is reduced, the service life of the double-stage reciprocating type electric vacuum pump is prolonged, and the vibration noise during working is obviously improved. The connecting rod 23 is arranged below the piston 24, one end of the connecting rod 23 is hinged on the piston 24, the other end of the connecting rod 23 is sleeved on the bearing 22, the bearing 22 is sleeved on the eccentric wheel 21, the connecting rod 23 and the bearing 22 are in interference fit together, the bearing 22 and the eccentric wheel 21 are in interference fit together, the eccentric wheel 21 is fixedly arranged on an output shaft 11 of the double-shaft stretching motor 1, the eccentric wheel 21 can drive the piston 24 to slide in the cylinder body in a reciprocating manner, the cylinder body is provided with an air inlet hole 281 and an air outlet hole 282, the air inlet hole 281 is provided with an air inlet check valve 4 for a one-way sealing air inlet hole 281, the air outlet hole 282 is provided with an air outlet check valve 5 for a one-way sealing air outlet hole 282, the cylinder body is fixedly provided with a top cover 25 covering the air inlet hole 281 and the air outlet hole 282, the, the air inlet hole 281 and the air release hole 282 on one cylinder body are respectively communicated with the air inlet hole 281 and the air release hole 282 of the other cylinder body through the two vent pipes 3, the top cover 25 is also provided with a first hole 253 communicated with the air inlet hole 281 and a second hole 254 communicated with the air release hole 282, and the top cover 25 is provided with a plurality of ribs 252.

And adopt the biax to stretch motor 1 and drive two pumping mechanism 2 and to being pumped the container and bleed, can take out the air more fast, reduce the air simultaneously and produce the refluence at this doublestage reciprocating type electric vacuum pump, make it possess better powerful vacuum effect to the structure that both sides set up pumping mechanism 2 can let the biax motor obtain more steady operational environment, noise abatement and vibration increase this doublestage reciprocating type electric vacuum pump's life-span.

The output shaft 11 of the double-shaft extension motor 1 rotates to drive the eccentric wheel 21 to perform circular motion around the output shaft 11, the eccentric wheel 21 drives the connecting rod 23 to move through the bearing 22, the connecting rod 23 drives the piston 24 to perform reciprocating motion in the cylinder sleeve 27, the bearing 22 is adopted to transmit between the eccentric wheel 21 and the connecting rod 23, the friction coefficient of the bearing 22 in the transmission process is ensured to be reduced, the whole service life of parts is prolonged, the rotation precision is ensured, and the high-efficiency transmission motion is facilitated, a plurality of ribbed plates 252 are formed on the top cover 25, the ribbed plates 252 play a role of improving the structural strength of the top cover 25 on one hand, on the other hand, a large amount of heat can be generated in work, the heat can be increased through the ribbed plates 252 and contact surfaces with the outside, and can be quickly dissipated into the atmosphere through the ribbed plates 252, so that the temperature of the double-stage, Low working noise and quick heat dissipation.

The cylinder body comprises a cylinder seat 26, a cylinder sleeve 27 and a gas valve body pressure plate 28, the cylinder seat 26, the cylinder sleeve 27, the gas valve body pressure plate 28 and a top cover 25 are sequentially fixed together from bottom to top, the cylinder seat 26 and the cylinder sleeve 27 are communicated with each other, the cylinder seat 26 is fixedly arranged on one side of the double-shaft extension motor 1, the eccentric wheel 21 and the bearing 22 are arranged in the cylinder seat 26, the piston 24 is arranged in the cylinder sleeve 27 in a sliding mode, and the air inlet hole 281 and the air release hole 282 are formed in the gas valve body pressure plate 28. The cylinder block 26 serves as a structural basis for the cylinder block for the mounting of other components. The integral structure of the cylinder seat 26 is in a three-way pipe shape, and the integral structure of the cylinder sleeve 27 is in a pipe body.

The cylinder base 26, the cylinder sleeve 27, the air valve body pressure plate 28 and the top cover 25 are fixed together from bottom to top in sequence, the eccentric wheel 21 and the bearing 22 are installed in the cylinder base 26, the piston 24 is installed in the cylinder sleeve 27, and the air inlet one-way valve 4 and the air outlet one-way valve 5 are installed on the air valve body pressure plate 28, so that the two-stage reciprocating type electric vacuum pump has the advantages of reasonable structural design and convenience in assembly.

The cylinder body further comprises a side cover 29, an operation opening 261 facing the bearing 22 is formed in the cylinder base 26, the side cover 29 covers the operation opening 261, and the side cover 29 can be fixed on the cylinder body through bolts.

The bearing 22 needs to be maintained to improve the service life in the using process, and a user can maintain the bearing 22 through the operation port 261, so that the double-stage reciprocating type electric vacuum pump has the advantages of convenience in maintenance and reasonable structural design.

The air release check valve 5 and the piston 24 are arranged at two sides of the air release hole 282, and the air inlet check valve 4 and the piston 24 are arranged at the same side of the air inlet hole 281. The air inlet check valve 4 and the air outlet check valve 5 are respectively used as a component for controlling the opening degree of the air inlet hole 281 and the air outlet hole 282, when the pressure in the cylinder liner 27 reaches a certain difference value, the air inlet check valve 4 or the air outlet check valve 5 is opened, so that the air enters the cylinder liner 27 through the air inlet hole 281 or the air in the cylinder liner 27 is discharged outwards through the air outlet hole 282.

The eccentric wheel 21 is provided with a shaft hole 211, and the output shaft 11 of the double-shaft extension motor 1 is in interference fit in the shaft hole 211. The shaft hole 211 is not located on the rotation center of the eccentric wheel 21, and the output shaft 11 of the double-shaft stretching motor 1 is in interference fit in the shaft hole 211, so that slipping between the output shaft 11 and the eccentric wheel 21 is avoided, and the eccentric wheel 21 can transmit the torque of the double-shaft stretching motor 1 more stably.

The connecting rod 23 is connected with the piston 24, the connecting rod is made of casting aluminum alloy, the tensile strength is 320MPa, the elongation is 3.5%, the hardness is 85HBW, the connecting rod 23 can be connected with the eccentric wheel 21 through the bearing 22, and the connecting rod 23 cannot be damaged due to the huge force generated by the high-speed rotation of the eccentric wheel 21 into the high-speed up-and-down movement. And the corrosion resistance is strong, so that the corrosion in some adverse environments or in those adverse environments can be avoided.

The surface of the vent pipe 3 is plated with color zinc. The communicating pipe is used as a communicating pipe between the two top covers 25, the communicating pipe is made of 2A12 aluminum alloy, 2A12 aluminum alloy is high-strength hard aluminum, heat treatment strengthening can be performed, and the outer surface of the communicating pipe is plated with color, so that the corrosion resistance of the communicating pipe can be greatly improved.

The general working flow of the present two-stage reciprocating electric vacuum pump is described below:

the first holes 253 on the two top covers 25 are connected with a pumped container, the second holes 254 of the two top covers 25 are communicated with the outside, the double-shaft stretching motor 1 is started after the double-shaft stretching motor 1 is communicated with a power supply, the piston 24 reciprocates in the cylinder sleeve 27, when the piston 24 moves downwards, the inside of the cylinder sleeve 27 is in a pumping state, the air inlet one-way valve 4 is opened, air in the pumped container continuously enters the cylinder sleeve 27, when the inside volume of the cylinder sleeve 27 reaches the maximum, the pressure in the cylinder sleeve 27 simultaneously becomes the minimum, when the pressures on the upper side and the lower side of the air inlet one-way valve 4 are equal, the air inlet one-way valve 4 is closed, when the piston 24 moves upwards, the inside of the cylinder sleeve 27 is in a deflation state, the air outlet one-way valve 5 is opened, the air in the cylinder sleeve 27 is continuously discharged to the outside, when the inside volume of the cylinder sleeve 27 reaches the minimum, the air pressure in the cylinder sleeve 27, the bleeder non-return valve 5 is closed and the same principle is used in the other cylinder 27 to achieve the discharge of air to the environment. The double-stage reciprocating electric vacuum pump does not pump or exhaust air until the air pressure of the pumped container reaches the minimum, the double-stage reciprocating electric vacuum pump is in a dynamic balance state, and the pressure which can be reached by the pumped container is called as the limit vacuum pressure.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A two-stage reciprocating electric vacuum pump is characterized by comprising a double-shaft extension motor (1), two air pumping mechanisms (2) and two air pipes (3), wherein each air pumping mechanism (2) comprises a cylinder body, an eccentric wheel (21), a bearing (22), a connecting rod (23) and a piston (24), the cylinder body is fixedly arranged on one side of the double-shaft extension motor (1), the piston (24) is hermetically arranged in the cylinder body, one end of the connecting rod (23) is hinged on the piston (24), the other end of the connecting rod (23) is sleeved on the bearing (22), the bearing (22) is sleeved on the eccentric wheel (21), the eccentric wheel (21) is fixedly arranged on an output shaft (11) of the double-shaft extension motor (1), the eccentric wheel (21) can drive the piston (24) to slide in the cylinder body in a reciprocating manner, an air inlet hole (281) and an air outlet hole (282) are formed in the cylinder body, and an air inlet check valve (4) of, the air release hole (282) is provided with an air release one-way valve (5) for sealing the air release hole (282) in a one-way manner, the cylinder body is fixedly provided with top covers (25) covering the air inlet hole (281) and the air release hole (282), the top covers (25) are provided with clapboards (251) for separating the air inlet hole (281) and the air release hole (282), the two breather pipes (3) are connected between the two top covers (25), the air inlet hole (281) and the air release hole (282) on one cylinder body are respectively communicated with the air release hole (282) and the air inlet hole (281) of the other cylinder body through the two breather pipes (3), the top cover (25) is also provided with a first hole (253) communicated with the air inlet hole (281) and a second hole (254) communicated with the air release hole (282), and the;

the cylinder body comprises a cylinder seat (26), a cylinder sleeve (27) and a gas valve body pressure plate (28), the cylinder seat (26), the cylinder sleeve (27) and the gas valve body pressure plate (28) are sequentially fixed together from bottom to top, the cylinder seat (26) is fixedly arranged on one side of the double-shaft extension motor (1), an eccentric wheel (21) and a bearing (22) are arranged in the cylinder seat (26), a piston (24) is arranged in the cylinder sleeve (27) in a sliding manner, and a gas inlet hole (281) and a gas release hole (282) are formed in the gas valve body pressure plate (28);

the cylinder body further comprises a side cover (29), an operation opening (261) facing the bearing (22) is formed in the cylinder base (26), and the side cover (29) is arranged on the operation opening (261) in a covering mode.

2. The two-stage reciprocating electric vacuum pump as claimed in claim 1, characterized in that the bleed check valve (5) and the piston (24) are arranged at both sides of the bleed hole (282), and the intake check valve (4) and the piston (24) are arranged at the same side of the intake hole (281).

3. The two-stage reciprocating electric vacuum pump as claimed in claim 1, wherein the eccentric wheel (21) is provided with a shaft hole (211), and the output shaft (11) of the double-shaft extension motor (1) is in interference fit with the shaft hole (211).

4. The two-stage reciprocating electric vacuum pump according to claim 1, characterized in that the surface of the breather pipe (3) is treated with a color zinc plating.