Reciprocating vacuum pump

Abstract

This utility model relates to the field of vacuum pump technology, specifically a reciprocating vacuum pump. It includes: a first housing with an inlet and an outlet; a first cavity formed on the first housing and connected to the inlet; a second cavity formed on the first housing and connected to the outlet; a valve plate located at the lower end of the first housing and equipped with a one-way valve; a second housing located at the lower end of the valve plate and equipped with a third cavity and a fourth cavity; the third cavity is connected to the first and second cavities via a one-way valve, and the fourth cavity is connected to the first and second cavities via a one-way valve. A cylindrical cavity is provided inside the second housing, with its two ends connected to the third and fourth cavities respectively, and a piston is slidably disposed within the cylindrical cavity. A rotatable crank and a slidable slide rod are provided inside the second housing, with a connecting rod between the crank and the slide rod, and the slide rod connected to the piston. The reciprocating motion of the piston can generate a vacuum, resulting in higher working efficiency.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically to reciprocating vacuum pumps. Background Technology

[0002] A reciprocating vacuum pump is a positive displacement vacuum device that uses the reciprocating motion of a piston to compress and pump gas. It is widely used in chemical, pharmaceutical, and semiconductor industries and is a core component for achieving medium to low vacuum environments. Its typical structure includes a cylinder, piston assembly, intake valve, exhaust valve, crankshaft connecting rod mechanism, and lubrication system. During operation, the piston reciprocates periodically within the cylinder, causing periodic changes in the cavity volume, thereby directionally delivering gas and reducing its pressure.

[0003] Currently widely used reciprocating vacuum pumps typically employ a single-cylinder design. In this design, both the intake and exhaust lines are connected to the same cylinder's working chamber, and gas intake and exhaust are completed directly within this single chamber. The limitation of this structure is that, because the intake and exhaust actions must occur sequentially at different phases of the same working cycle, they cannot be operated simultaneously, thus restricting the effective pumping efficiency. Utility Model Content

[0004] In order to solve the technical problems existing in the background art, this utility model provides a reciprocating vacuum pump, in which the reciprocating motion of the piston can generate a vacuum, and the working efficiency is higher.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] Reciprocating vacuum pump, including:

[0007] The first housing is provided with an air inlet and an air outlet;

[0008] The first cavity is formed on the first housing and is connected to the air inlet;

[0009] The second cavity is located on the first housing and is connected to the air outlet.

[0010] A valve plate is located at the lower end of the first housing and is equipped with a one-way valve.

[0011] The second housing is located at the lower end of the valve plate and has a third cavity and a fourth cavity.

[0012] The third chamber is connected to the first and second chambers via a one-way valve, and the fourth chamber is connected to the first and second chambers via a one-way valve.

[0013] Furthermore, a cylindrical cavity is provided inside the second housing, with its two ends connected to the third and fourth cavities respectively, and the piston is slidably disposed inside the cylindrical cavity.

[0014] Furthermore, a rotatable crank and a slidable slide rod are provided inside the second housing, a connecting rod is provided between the crank and the slide rod, and the slide rod is connected to the piston.

[0015] Furthermore, a drive wheel is provided on the outer side of the second housing, which is connected to the crank drive and is driven by a motor.

[0016] Furthermore, the check valve includes:

[0017] A fixed cylinder is fixedly connected to the valve plate.

[0018] The central column is slidably mounted on the fixed cylinder;

[0019] A spring is positioned between the central column and the fixed cylinder;

[0020] The blocking plate is closable and is fixedly connected to one end of the fixed cylinder and fixedly connected to the central column.

[0021] Furthermore, the central column is threaded with a limit nut, and the two ends of the spring abut against the limit nut and the fixed cylinder, respectively.

[0022] The beneficial effects of this utility model are:

[0023] (1) Each reciprocating stroke of the piston in the cylinder will simultaneously produce an intake effect in one chamber and an exhaust effect in another chamber. This means that each reciprocating stroke of the piston can complete two effective pumping cycles. Compared with a single-acting pump, which can only perform one pumping cycle per reciprocating stroke, the pumping efficiency is significantly improved, the required vacuum level can be reached more quickly, and the pumping volume per unit time is greater.

[0024] (2) Two independent chambers are designed to correspond to the inlet and outlet sides respectively, and are connected to the actuation chamber through a one-way valve. This helps to separate the high and low pressure areas, reduce gas crosstalk and pressure fluctuation, improve the pumping stability and ultimate vacuum, and simplify the pipeline, shorten the inlet and outlet channels, and reduce flow resistance loss.

[0025] (3) The pre-compression of the spring can be easily adjusted by the threaded limit nut, thereby accurately setting the opening pressure of the check valve. This allows the valve performance to be optimized and calibrated on-site according to actual working conditions, improving the adaptability and efficiency of the pump, and also facilitating compensation adjustment of the valve after wear. Attached Figure Description

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0028] Figure 2This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0029] Figure 3 This is a cross-sectional view of the present invention. Figure 1 ;

[0030] Figure 4 This is a cross-sectional view of the present invention. Figure 2 ;

[0031] Figure 5 This is a cross-sectional view of the present invention. Figure 3 ;

[0032] Figure 6 This is a cross-sectional view of a one-way valve.

[0033] In the picture:

[0034] 1. First housing, 2. Valve plate, 3. Second housing, 4. Drive wheel, 5. Crank, 6. Connecting rod, 7. Slide rod, 8. Piston, 9. Cylinder cavity;

[0035] 101. Air inlet; 102. First chamber; 103. Second chamber; 104. Air outlet;

[0036] 201. Check valve;

[0037] 301. Third cavity; 302. Fourth cavity;

[0038] 2011. Fixed cylinder, 2012. Blocking plate, 2013. Center column, 2014. Spring, 2015. Limit nut. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings.

[0040] like Figure 1-5 As shown, the reciprocating vacuum pump includes a first housing 1, with an inlet 101 and an outlet 104 on both sides. A first chamber 102 is formed on the first housing 1 and communicates with the inlet 101. A second chamber 103 is formed on the first housing 1 and communicates with the outlet 104. A valve plate 2 is located at the lower end of the first housing 1 and is equipped with four one-way valves 201. A second housing 3 is located at the lower end of the valve plate 2 and has a third chamber 301 and a fourth chamber 302.

[0041] The third cavity 301 is connected to the first cavity 102 and the second cavity 103 through two one-way valves 201, and the fourth cavity 302 is connected to the first cavity 102 and the second cavity 103 through two one-way valves 201.

[0042] In a specific embodiment, gas in the third chamber 301 can enter the second chamber 103 through the one-way valve 201 between the third chamber 301 and the second chamber 103. Gas in the fourth chamber 302 can enter the second chamber 103 through the one-way valve 201 between the fourth chamber 302 and the second chamber 103. Gas in the first chamber 102 can enter the third chamber 301 through the one-way valve 201 between the first chamber 102 and the third chamber 301. Gas in the first chamber 102 can enter the fourth chamber 302 through the one-way valve 201 between the first chamber 102 and the fourth chamber 302.

[0043] The second housing 3 contains a cylindrical cavity 9, which is connected at both ends to the third cavity 301 and the fourth cavity 302, respectively. The piston 8 is slidably disposed within the cylindrical cavity 9. The second housing 3 contains a rotatable crank 5 and a slidable slide rod 7, with a connecting rod 6 between them. The slide rod 7 is connected to the piston 8. A drive wheel 4 is located on the outer side of the second housing 3, and is driven by a motor and connected to the crank 5. Rotation of the drive wheel 4 drives the piston 8 to slide within the cylindrical cavity 9.

[0044] Each reciprocating stroke of piston 8 within cylinder cavity 9 generates suction in the first cavity 102 and exhaust in the second cavity 103. This means that each reciprocating stroke of piston 8 completes two effective pumping cycles. Compared to a single-acting pump that only performs one pumping cycle per reciprocating stroke, pumping efficiency is significantly improved, the required vacuum level can be reached more quickly, and the pumping volume per unit time is greater.

[0045] Furthermore, the design incorporates two independent chambers corresponding to the inlet and outlet sides, respectively, which are connected to the actuation chamber via a one-way valve. This helps to separate high and low pressure areas, reduce gas crosstalk and pressure fluctuations, improve pumping stability and ultimate vacuum, and simplify the piping, shorten the inlet and outlet channels, and reduce flow resistance losses.

[0046] like Figure 6 As shown, the one-way valve 201 includes a fixed cylinder 2011, which is fixedly connected to the valve plate 2. A central column 2013 is slidably mounted on the fixed cylinder 2011. A spring 2014 is disposed between the central column 2013 and the fixed cylinder 2011. A plug plate 2012 is openable and closable at one end of the fixed cylinder 2011 and is fixedly connected to the central column 2013. A limit nut 2015 is threadedly connected to the central column 2013, and both ends of the spring 2014 abut against the limit nut 2015 and the fixed cylinder 2011, respectively.

[0047] The pre-compression of the spring 2014 can be easily adjusted via the threaded limit nut 2015, thereby precisely setting the opening pressure of the check valve 201. This allows the valve performance to be optimized and calibrated on-site according to actual working conditions, improving the pump's adaptability and efficiency, and also facilitating compensatory adjustments to the valve after wear.

[0048] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A reciprocating vacuum pump, characterized in that, include: The first housing (1) is provided with an air inlet (101) and an air outlet (104). The first cavity (102) is opened on the first housing (1) and is connected to the air inlet (101); The second cavity (103) is opened on the first housing (1) and is connected to the air outlet (104); A valve plate (2) is located at the lower end of the first housing (1) and is equipped with a one-way valve (201). The second housing (3) is located at the lower end of the valve plate (2) and has a third cavity (301) and a fourth cavity (302). The third cavity (301) is connected to the first cavity (102) and the second cavity (103) through a one-way valve (201), and the fourth cavity (302) is connected to the first cavity (102) and the second cavity (103) through a one-way valve (201).

2. The reciprocating vacuum pump according to claim 1, characterized in that, The second housing (3) is provided with a cylindrical cavity (9), and the two ends of the cylindrical cavity (9) are respectively connected to the third cavity (301) and the fourth cavity (302). The piston (8) is slidably disposed in the cylindrical cavity (9).

3. The reciprocating vacuum pump according to claim 2, characterized in that, The second housing (3) is provided with a rotatable crank (5) and a slidable slide rod (7), and a connecting rod (6) is provided between the crank (5) and the slide rod (7), and the slide rod (7) is connected to the piston (8).

4. The reciprocating vacuum pump according to claim 3, characterized in that, The outer side of the second housing (3) is provided with a drive wheel (4), which is connected to the crank (5) for transmission. The drive wheel (4) is driven by a motor.

5. The reciprocating vacuum pump according to claim 1, characterized in that, The one-way valve (201) includes: The fixed cylinder (2011) is fixedly connected to the valve plate (2); The central column (2013) is slidably mounted on the fixed cylinder (2011); A spring (2014) is positioned between the central column (2013) and the fixed cylinder (2011); A blocking plate (2012) is openable and closable at one end of a fixed cylinder (2011) and is fixedly connected to a central column (2013).

6. The reciprocating vacuum pump according to claim 1, characterized in that, The center column (2013) is threadedly connected to the limit nut (2015), and the two ends of the spring (2014) abut against the limit nut (2015) and the fixed cylinder (2011) respectively.

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