Vacuum pump

Abstract

The invention discloses a vacuum pump, and belongs to the technical field of mechanical equipment vacuum pumps. A filter element is arranged in the filter valve. The filter valve shell is provided with a filter valve air inlet and outlet, and the filter valve air inlet is provided with an air inlet one-way valve. The filter valve opening air outlet is provided with an air outlet one-way valve. A left air port pipeline of the air cylinder is connected with an air inlet and outlet of the filter valve; a right air port pipeline of the air cylinder is connected with an air inlet and an air outlet of the filter valve; the air cylinder piston compresses air, the air is discharged from the air outlet of the filter valve, the other cavity enters from the air suction pipe, the air inlet of the filter valve and the air inlet and outlet of the filter valve, and the air suction port forms required seed suction negative pressure. Sucked air is filtered by the filter element, sanitation in the cavity of the air cylinder is kept, blown air passes through the filter element and can take away dust of the filter element, a hydraulic motor or a motor or motor speed reduction can be used as power, the low rotating speed is achieved, damage is not prone to occurring, and the negative pressure formed through cooperation of multiple air cylinders is larger.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum pumps for agricultural machinery sowing equipment, and in particular relates to a vacuum pump. Background Art

[0002] The current agricultural air suction seeding uses a fan to generate negative pressure to achieve vacuum seeding, which requires a high speed, generally 3500-5000 rpm. The electric fan has a fast speed, generally 10000-23000 rpm, with a high failure rate and easy damage. The existing vacuum pump is expensive and cannot remove dust and is easy to damage. Therefore, a low-speed vacuum pump that can remove dust is needed. Summary of the invention

[0003] The object of the present invention is to provide a vacuum pump which uses a cylinder piston to move repeatedly to form negative pressure.

[0004] The technical solution adopted is:

[0005] A vacuum pump comprises a casing, a power source, a crankshaft, a plurality of cylinders, a plurality of filter valves and an air suction pipe.

[0006] The output shaft sprocket of the power source and the sprocket of the crankshaft are connected by a chain.

[0007] The front and rear ends of the crankshaft are supported on the opposite side walls of the box body through bearings respectively.

[0008] The rear part of the cylinder body of each cylinder is hinged to the side wall of the box body through a shaft.

[0009] The piston rod end of each cylinder is arranged on a corresponding connecting rod neck of the crankshaft via a respective bearing.

[0010] The filter valve comprises a filter valve housing, a filter element, a filter valve air inlet and outlet, a filter valve air inlet and a filter valve air outlet.

[0011] The filter element is arranged in the filter valve housing.

[0012] The filter valve housing is provided with filter valve air inlet and outlet ports.

[0013] The filter valve housing is provided with a filter valve air inlet and an air inlet non-return valve.

[0014] The filter valve housing is provided with a filter valve air outlet and an air outlet one-way valve.

[0015] The left air port pipeline of the cylinder is connected to the filter valve air inlet and outlet of the corresponding filter valve, and the filter valve air inlet pipeline is connected to the suction pipe.

[0016] The right air port pipeline of the cylinder is connected to the filter valve air inlet and outlet of the corresponding filter valve, and the filter valve air inlet pipeline is connected to the suction pipe.

[0017] The air intake pipe has at least one air intake port.

[0018] Its advantages are:

[0019] This vacuum pump can use an electric motor, a motor reducer or a hydraulic motor as the power, and can achieve a low speed of several hundred revolutions per minute. The required power can be reduced, the cost is reduced, the failure rate is low, it is not easy to damage, and it is easy to maintain. When multiple cylinders are used in combination, a greater negative pressure is formed. The more cylinders, the greater the negative pressure formed. It is also convenient to use with a hydraulic system. The inhaled air is filtered to keep the cylinder cavity clean and hygienic. The blown air passes through the filter element to take away the dust in the filter element, and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the present invention without the box body.

[0022] Figure 3 Schematic diagram of the filter valve structure.

[0023] Figure 4 A cross-sectional view of the filter valve.

[0024] Figure 5 It is the gas path connection principle diagram of the present invention.

[0025] Figure 6 for Figure 5 A magnified detail on the left.

[0026] Box body 1, power source 2, crankshaft 3, cylinder 4, filter valve 5, intake pipe 6, chain 7, connecting rod neck 8, left air port 9, right air port 10, filter valve housing 11, filter element 12, filter valve air inlet and outlet 13, filter valve air inlet 14, filter valve air outlet 15, intake port 16, outlet check valve 17, intake check valve 18, piston 19. DETAILED DESCRIPTION

[0027] A vacuum pump comprises a housing 1, a power source 2, a crankshaft 3, a plurality of cylinders 4, a plurality of filter valves 5 and an air intake pipe 6.

[0028] The housing of the power source 2 is fixed in the casing 1 .

[0029] The box body 1 is a rectangular box body.

[0030] The power source 2 can be a hydraulic motor or an electric motor, or an electric motor reduction gear.

[0031] The sprocket of the output shaft (the output shaft of the hydraulic motor) of the power source 2 and the sprocket at the rear end of the crankshaft 3 are connected by a chain 7 .

[0032] The front and rear ends of the crankshaft 3 are supported on the front and rear opposite side walls of the housing 1 through bearings ( Figure 1 The front side wall is not shown).

[0033] The rear part of the cylinder body of each cylinder 4 is hinged to the right side wall of the box body 1 through an axis.

[0034] The piston rod end of each cylinder 4 is arranged on the corresponding connecting rod neck 8 of the crankshaft 3 through a respective bearing, and a plurality of connecting rod necks 8 are arranged at uniform angles on the circumference of the crankshaft 3 .

[0035] In this embodiment, there are three connecting rod necks 8, which are evenly arranged in the circumferential direction of the crankshaft 3 and arranged at 120 degrees.

[0036] The filter valve 5 comprises a filter valve housing 11 , a filter element 12 , a filter valve air inlet and outlet 13 , a filter valve air inlet 14 and a filter valve air outlet 15 .

[0037] The filter element 12 is disposed in the filter valve housing 11. The filter valve housing 11 is in the shape of a rectangular parallelepiped.

[0038] The filter valve housing 11 is provided with a filter valve air inlet and outlet 13 on the front side thereof.

[0039] A filter valve air inlet 14 is provided on the left side of the filter valve housing 11 .

[0040] The filter valve air inlet 14 is provided with an air inlet check valve 18, which can only allow air to enter.

[0041] A filter valve air outlet 15 is provided on the lower side of the filter valve housing 11 .

[0042] The filter valve air outlet 15 is provided with an air outlet check valve 17, which can only allow air to be discharged.

[0043] The left air port 9 of the cylinder 4 is connected to the corresponding filter valve air inlet and outlet 13 of the filter valve 5 , and the filter valve air inlet 14 is connected to the air intake pipe 6 through a pipeline.

[0044] The right air port 10 of the cylinder 4 is connected to the corresponding filter valve air inlet and outlet 13 of the filter valve 5 , and the filter valve air inlet 14 is connected to the air intake pipe 6 through a pipeline.

[0045] The air intake pipe 6 has at least one air intake port 16 , and in this embodiment, has two air intake ports 16 .

[0046] The working principle is:

[0047] The output shaft sprocket of the power source 2 and the sprocket of the crankshaft 3 are connected by a chain 7. The power source 2 drives the crankshaft 3 to rotate, and the crankshaft 3 drives the piston rods of at least three cylinders 4 to move left and right. Each cylinder 4 has two filter valves 5 with the same structure to work together. Figure 5 and Figure 6As shown:

[0048] When the piston 19 of the cylinder 4 moves to the left, the air in the left cavity is pushed to the corresponding filter valve 5, and discharged from the filter valve outlet 15, pushing open the outlet check valve 17, and blowing out the dust accumulated on the filter element 12. At the same time, the right cavity becomes larger, and the air is sucked into the filter valve inlet 14 from the air intake port 16, pushing open the air intake check valve 18, filtered by the filter element 12, and enters the right cavity from the filter valve inlet and outlet 13. The filtration by the filter element 12 can keep the cavity of the cylinder 4 clean, and form the required seed suction negative pressure in the equipment connected to the air intake port 16.

[0049] When the piston 19 of the cylinder 4 moves to the right, the air in the right cavity is pushed from the filter valve inlet and outlet 13 to the corresponding filter valve 5, and is discharged from the filter valve outlet 15 by pushing open the outlet check valve 17. At the same time, the left cavity becomes larger, and air is sucked into the filter valve inlet 14 from the air inlet 16, pushing open the air inlet check valve 18, filtered by the filter element 12, and enters the left cavity from the filter valve inlet and outlet 13, forming the required seed suction negative pressure in the device connected to the air inlet 16.

[0050] The crankshaft 3 drives the piston rods of the three cylinders 4 to move left and right in sequence, and the piston rods of the cylinders 4 move left and right in sequence to form a suction negative pressure. That is, when the piston 19 of the cylinder 4 compresses air in one cavity, the air is discharged from the filter valve outlet 15, and the other cavity enters the air from the suction pipe 6, the filter valve inlet 14 to the filter valve inlet and outlet 13, and the suction port 16 forms the required suction seed negative pressure.

[0051] The use of the hydraulic motor as a power source can achieve low rotation speed and is convenient for cooperating with the hydraulic system for use with the seed meter.

[0052] The power source 2 may also be a motor or a motor reducer.

[0053] The output shaft sprocket of the motor and the sprocket at the rear end of the crankshaft 3 are connected for transmission via a chain 7 , or the output shaft sprocket of the motor reducer and the sprocket at the rear end of the crankshaft 3 are connected for transmission via a chain 7 .

Claims

1. A vacuum pump, comprising a housing (1), a power source (2), a crankshaft (3), a plurality of cylinders (4), a plurality of filter valves (5) and an air intake pipe (6); characterized in that: The output shaft sprocket of the power source (2) and the sprocket of the crankshaft (3) are connected via a chain (7); The front and rear ends of the crankshaft (3) are supported on opposite side walls of the housing (1) through bearings respectively; The rear part of the cylinder body of each cylinder (4) is hinged to the side wall of the box body (1) through a shaft; The piston rod end of each cylinder (4) is arranged on the corresponding connecting rod neck (8) of the crankshaft (3) through a respective bearing; The filter valve (5) comprises a filter valve housing (11), a filter element (12), a filter valve air inlet and outlet (13), a filter valve air inlet (14) and a filter valve air outlet (15); The filter element (12) is arranged in the filter valve housing (11); The filter valve housing (11) is provided with a filter valve air inlet and outlet (13); The filter valve housing (11) is provided with a filter valve air inlet (14) and an air inlet check valve (18); The filter valve housing (11) is provided with a filter valve air outlet (15) and an air outlet check valve (17); The left air port (9) of the air cylinder (4) is connected to the filter valve air inlet and outlet (13) of the corresponding filter valve (5) through a pipeline, and the filter valve air inlet (14) is connected to the air intake pipe (6); The pipeline of the right air port (10) of the air cylinder (4) is connected to the filter valve air inlet and outlet (13) of the corresponding filter valve (5), and the pipeline of the filter valve air inlet (14) is connected to the air intake pipe (6); The air intake pipe (6) has at least one air intake port (16).

2. A vacuum pump according to claim 1, characterized in that: A plurality of connecting rod necks (8) on the crankshaft (3) are arranged at uniform angles on the circumference.

3. A vacuum pump according to claim 1, characterized in that: There are three cylinders (4).

4. A vacuum pump according to claim 1, characterized in that: The air intake pipe (6) has two air intake ports (16).

5. A vacuum pump according to claim 1, characterized in that: The power source (2) is a hydraulic motor, an electric motor or a motor reducer.

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