Vacuum pump and method of use

Abstract

The present invention discloses a vacuum pump and a method of using the same, including a pump body, a mounting cavity provided inside the pump body, a piston installed inside the mounting cavity, the piston dividing the mounting cavity into a first outer cavity and a second outer cavity, a piston cavity provided inside the piston, a piston positioning shaft installed in the piston cavity, a fixing plate provided on the piston positioning shaft, the fixing plate dividing the piston cavity into a first inner cavity and a second inner cavity, a valve core rod installed in the piston positioning shaft, a driving device connected to the valve core rod and the piston, the driving device driving the piston to reciprocate in the mounting cavity, and the driving device driving the valve core rod to reciprocate in the piston positioning shaft. The present invention divides the pump body into four chambers by providing a piston, a piston positioning shaft and a valve core rod, thereby achieving a higher vacuum degree, having a simple overall structure, being more convenient to use, and convenient parts manufacturing, thereby reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum obtaining devices, and in particular to a vacuum pump and a use method thereof. Background Art

[0002] In the current field of vacuum pump technology, a vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physicochemical methods to evacuate the container to obtain a vacuum. In layman's terms, a vacuum pump is a device that uses various methods to improve, generate and maintain a vacuum in a closed space. It is widely used in electronics, printing and papermaking, chemical medicine, food processing and packaging and other fields.

[0003] According to the working principle of vacuum pump, it can be divided into two basic types: gas transmission pump and gas capture pump. Gas transmission pump mainly achieves the purpose of pumping by continuously inhaling and exhausting gas, while gas capture pump achieves the purpose of pumping by adsorbing or condensing gas molecules on the inner surface of the pump, thereby reducing the number of gas molecules in the container. In vacuum technology, "vacuum degree" and "pressure" are generally used to indicate the degree of vacuum. The lower the pressure in a certain space, the higher the vacuum degree, and the higher the pressure, the lower the vacuum degree. According to the different physical characteristics in each pressure range, vacuum is generally divided into several areas: rough vacuum, low vacuum, high vacuum and ultra-high vacuum.

[0004] At present, the types of commonly used vacuum pumps include: piston vacuum pumps, rotary vane vacuum pumps, etc., which are generally selected according to the working pressure, starting pressure, and working conditions required by the process. The existing vacuum pumps have complex structures, are inconvenient to use, and have high manufacturing costs. It is difficult for general companies to afford their use costs.

[0005] In view of this, we propose a new vacuum obtaining device. Summary of the invention

[0006] In view of the above problems, the present invention proposes a vacuum pump and a method of use to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] A vacuum pump comprises a pump body, wherein a mounting cavity is arranged inside the pump body, a piston is installed inside the mounting cavity, and the piston divides the mounting cavity into a first outer cavity and a second outer cavity, wherein the first outer cavity is formed by a space between an inner wall of the pump body and a head of the piston, and the second outer cavity is formed by a space between an inner wall of the pump body and a tail of the piston;

[0009] The piston is provided with a piston cavity inside, a piston positioning shaft is installed in the piston cavity, a fixing plate is provided on the piston positioning shaft, the fixing plate divides the piston cavity into a first inner chamber and a second inner chamber, the first inner chamber is formed by the space between the inner wall of the piston and the front side of the fixing plate, and the second inner chamber is formed by the space between the inner wall of the piston and the rear side of the fixing plate;

[0010] A valve core rod is installed in the piston positioning shaft, and a driving device is connected to the valve core rod and the piston. The driving device drives the piston to reciprocate in the installation cavity, and the driving device drives the valve core rod to reciprocate in the piston positioning shaft.

[0011] Furthermore, the piston is formed by assembling piston blocks, and the piston chamber is formed by adjacent piston blocks.

[0012] Furthermore, a gap is left between the piston positioning shaft and the valve core rod, and vent holes communicating with the gap are arranged at intervals on the piston positioning shaft in the axial direction, and flanges blocking the gap are arranged at intervals on the valve core rod.

[0013] Furthermore, the vent hole includes a first vent hole, a second vent hole, and a third vent hole, and the flange includes a first flange, a second flange, and a third flange. The first flange is located at one end of the valve core rod, and the valve core rod is in a first extreme position, the second flange is located on the right side of the second vent hole, and the third flange is located on the right side of the third vent hole. The valve core rod is in a second extreme position, the second flange is located between the first vent hole and the second vent hole, and the third flange is located on the right side of the third vent hole.

[0014] Furthermore, the driving device includes a first driving device and a second driving device, the power output end of the first driving device is connected to the piston, and the power output end of the second driving device is connected to the valve core rod.

[0015] Furthermore, the first driving device includes a driving member, a bracket, an eccentric rotating shaft, a rocker arm connecting rod, and a piston fixed shaft, the driving member is installed on the bracket, the bracket is installed on the pump body, the output end of the driving member is rotationally connected to the eccentric rotating shaft, the eccentric rotating shaft is rotationally connected to one end of the rocker arm connecting rod, the other end of the rocker arm connecting rod is connected to the piston fixed shaft, and the piston fixed shaft is connected to the piston.

[0016] Furthermore, the second driving device includes a solenoid valve, a relay and a photoelectric position sensor, a push-pull solenoid valve core is installed in the solenoid valve, the push-pull solenoid valve core is connected to the valve core rod, the relay is electrically connected to the solenoid valve, the photoelectric position sensor is electrically connected to the relay, and the photoelectric position sensor is installed on the edge of the eccentric rotating shaft.

[0017] Furthermore, the driving component is a motor or a cylinder, and the motor is a speed-regulating motor.

[0018] A working method of a vacuum pump comprises the following steps:

[0019] The valve core rod and the piston move to the right. During the movement, the space of the first outer chamber increases to inhale external air, and the space of the first inner chamber decreases to squeeze the internal air to flow to the second inner chamber. The space of the second inner chamber increases, and the space of the second outer chamber decreases to discharge the internal air outward until it is empty.

[0020] The valve core rod and the piston move to the left. During the movement, the space of the first outer chamber decreases, squeezing the internal gas to flow toward the first inner chamber, and the space of the first inner chamber increases. The space of the second inner chamber decreases, squeezing the internal gas to flow toward the second outer chamber, and the space of the second outer chamber increases.

[0021] Further, the valve core rod moves rightward to the first extreme position, the first flange and the piston positioning shaft are closed, the passage between the first outer chamber and the first inner chamber is closed, the second flange is located on the right side of the second vent hole, the passage between the second inner chamber and the second outer chamber is closed, and the passage between the first inner chamber and the second inner chamber is opened;

[0022] The valve core rod moves to the left to the second extreme position, the first flange closes the air inlet passage, the passage between the first outer chamber and the first inner chamber is opened, the second flange is located between the first vent hole and the second vent hole, the third flange is located to the right of the third vent hole, the passage between the second inner chamber and the second outer chamber is opened, and the passage between the first inner chamber and the second inner chamber is closed.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention divides the pump body into four chambers by providing a piston, a piston positioning shaft and a valve core rod. The four chambers work in series and provide power for vacuuming at the same time, thereby enhancing the vacuuming capacity of the vacuum pump. In this way, the gas can be pumped out in a shorter time, thereby achieving a higher vacuum degree. The device has a simple overall structure and is relatively easy to use. At the same time, the parts are easy to manufacture, thereby reducing the manufacturing cost and the use cost.

[0025] Furthermore, the motor is a speed-regulating motor, which makes the vacuum pump's vacuum extraction ability have a wider adjustment range. During operation, the extraction speed can be increased from low to high, low vacuum and low speed extraction, high vacuum and high speed extraction, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a cross-sectional schematic diagram of a vacuum pump according to Embodiment 1 of the present invention;

[0027] Figure 2is a three-dimensional schematic diagram of a vacuum pump according to Embodiment 1 of the present invention;

[0028] Figure 3 This is a schematic structural diagram of a piston positioning shaft according to a first embodiment of the present invention;

[0029] Figure 4 It is a cross-sectional schematic diagram of the piston positioning shaft according to the first embodiment of the present invention;

[0030] Figure 5 This is a schematic structural diagram of a valve core rod according to a first embodiment of the present invention;

[0031] Figure 6 It is a cross-sectional schematic diagram of the valve core rod of the first embodiment of the present invention;

[0032] Figure 7 It is a structural schematic diagram of an eccentric rotating shaft according to the first embodiment of the present invention;

[0033] Figure 8 This is a schematic structural diagram of a piston fixing shaft according to a first embodiment of the present invention;

[0034] Fig. 9 Schematic diagram of the structure of the rocker arm connecting rod of the first embodiment of the present invention;

[0035] Fig.10 This is a schematic diagram of the push-pull solenoid valve core structure of the first embodiment of the present invention;

[0036] Fig.11 This is a schematic structural diagram of the front support of the piston positioning shaft according to the first embodiment of the present invention;

[0037] Fig.12 This is a schematic structural diagram of a piston 1 according to Embodiment 1 of the present invention;

[0038] Fig.13 This is a schematic structural diagram of a piston 2 according to the first embodiment of the present invention;

[0039] Fig.14 It is a cross-sectional schematic diagram of a vacuum pump according to the second embodiment of the present invention.

[0040] Explanation of the reference numerals: 1. pump body, 2. piston, 3. piston positioning shaft, 4. valve core rod, 5. front support of piston positioning shaft, 6. air inlet channel, 7. spring, 8. first outer chamber, 9. first inner chamber, 10. second inner chamber, 11. linear bearing, 12. second outer chamber, 13. exhaust channel, 14. one-way valve, 15. lock nut, 16. solenoid valve, 17. push-pull solenoid valve core, 18. support plate, 19. electric Machine, 20, bracket, 21, piston one, 22 piston two, 23, groove, 24, screw hole, 25, eccentric shaft, 26, rocker arm connecting rod, 27, piston fixing shaft, 28, first vent hole, 29, second vent hole, 30, third vent hole, 31, first flange, 32, second flange, 33, third flange, 34, relay, 35, photoelectric position sensor, 36, cylinder, 37, gap, 38, fixing plate. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Embodiment 1

[0044] See also Figures 1 to 13The present embodiment provides a vacuum pump, comprising a pump body 1, wherein an installation cavity is arranged inside the pump body 1, a piston 2 is arranged inside the installation cavity, the piston 2 divides the installation cavity into a first outer chamber 8 and a second outer chamber 12, the first outer chamber 8 is formed by the space between the inner wall of the pump body 1 and the head of the piston 2, the second outer chamber 12 is formed by the space between the inner wall of the pump body 1 and the tail of the piston 2, a piston cavity is arranged inside the piston 2, a piston positioning shaft 3 is arranged in the piston cavity, a fixing plate 38 is arranged on the piston positioning shaft 3, the fixing plate 38 divides the piston cavity into a first inner chamber 9 and a second inner chamber 10, the first inner chamber 9 is formed by the space between the inner wall of the piston 2 and the front side of the fixing plate 38, the second inner chamber 10 is formed by the space between the inner wall of the piston 2 and the rear side of the fixing plate 38, a valve core rod 4 is arranged in the piston positioning shaft 3, the valve core rod 4 and the piston 2 are connected with a driving device, the driving device drives the piston 2 to reciprocate in the installation cavity, and the driving device drives the valve core rod 4 to reciprocate in the piston positioning shaft 3. By providing a piston 2, a piston positioning shaft 3 and a valve core rod 4, the pump body 1 is divided into four chambers. The four chambers work in series, and the four chambers provide power for vacuuming at the same time, so that the vacuuming capacity of the vacuum pump is enhanced. In this way, the gas can be pumped out in a shorter time, thereby achieving a higher vacuum degree. The overall structure of the device is simple and the use is relatively convenient. At the same time, the parts are easy to manufacture, which reduces the manufacturing cost and the use cost.

[0045] like Figure 12 to Figure 13 The piston 2 inside the pump body 1 includes a piston 1 21 and a piston 2 22. The piston 1 21 and the piston 2 22 are connected as a whole by bolts to form the piston 2. There is a fixed baffle in the middle of the piston 2. The piston 2 is designed to be divided into two parts due to structural requirements, and it is also convenient to install the piston positioning shaft 3 inside the piston 2. A screw hole 24 is provided on the end surface of one end of the piston 22, and a groove 23 is provided at the end of the piston 22 near the screw hole 24. The groove 23 is connected to the screw hole 24, and the groove 23 is used to facilitate the installation of the bolt. In addition, the piston 2 can also adopt a design method of upper and lower buckle, which is also easy to install the piston positioning shaft 3 inside the piston 2.

[0046] like Figures 3 to 6The piston positioning shaft 3 is provided with a first vent hole 28, a second vent hole 29, and a third vent hole 30. A gap 37 is left between the piston positioning shaft 3 and the valve core rod 4. The first vent hole 28, the second vent hole 29, and the third vent hole 30 are all connected to the gap 37. The vent holes and the gap 37 are used for the flow of gas between the chambers. The valve core rod 4 is provided with a first flange 31, a second flange 32, and a third flange 33, wherein the first flange 31 is provided at one end of the valve core rod 4. The first limit position is the position of the valve core rod 4 when the first flange 31 and the piston positioning shaft 3 are closed. When the valve core rod 4 is in the first limit position, the gap 37 between the first outer chamber 8 and the first inner chamber 9 is blocked by the first flange 31, that is, the passage between the first outer chamber 8 and the first inner chamber 9 is closed, and the gas cannot circulate between the two chambers. The second flange 32 is located on the right side of the second air vent 29. The gap 37 between the first inner chamber 9 and the second inner chamber 10 is not blocked by the second flange 32, that is, the passage between the first inner chamber 9 and the second inner chamber 10 is open, and the gas can circulate between the two chambers. The gap 37 between the second inner chamber 10 and the second outer chamber 12 is blocked by the second flange 32, that is, the passage between the second inner chamber 10 and the second outer chamber 12 is closed, and the gas cannot circulate between the two chambers. The third flange 33 is located on the right side of the third air vent 30. The second limit position is the position of the valve core rod 4 when the first flange 31 and the front support 5 of the piston positioning shaft are closed, and at this time, the air inlet passage 6 is closed. When the valve core rod 4 is in the second limit position, the gap 39 between the first outer chamber 8 and the first inner chamber 9 is not blocked by the first flange 31, that is, the passage between the first outer chamber 8 and the first inner chamber 9 is open, and the gas can flow between the two chambers, the second flange 32 is located between the first vent hole 28 and the second vent hole 29, and the third flange 33 is located on the right side of the third vent hole 30. The gap 37 between the first inner chamber 9 and the second inner chamber 10 is blocked by the second flange 32, that is, the passage between the first inner chamber 9 and the second inner chamber 10 is closed, and the gas cannot flow between the two chambers. The gap 37 between the second inner chamber 10 and the second outer chamber 12 is not blocked by the second flange 32 and the third flange 33, that is, the passage between the second inner chamber 10 and the second outer chamber 12 is open, and the gas can flow between the two chambers. The flange on the valve core rod 4 closes and opens the flow of gas between adjacent chambers as the valve core rod 4 moves, thereby controlling the direction of gas flow and limiting the vacuum.

[0047] like Figure 1As shown, the left side wall of the pump body 1 is fixedly connected with the piston positioning shaft front support 5 by bolts, and the piston positioning shaft front support 5 is used to support the piston positioning shaft 3. The left side wall of the pump body 1 is provided with an air intake channel 6, and a spring 7 is installed in the air intake channel 6. The spring 7 can make the valve core rod 4 return quickly. The right side wall of the pump body 1 is provided with an exhaust channel 13, and a one-way valve 14 is installed at the exhaust channel 13. The one-way valve 14 can only flow in one direction. The exhaust channel 13 is connected to the gap 37 between the valve core rod 4 and the piston positioning shaft 3 through the third vent hole 30.

[0048] like Figures 1 to 13 As shown, the piston 2 is slidably connected to the inner wall of the pump body 1, the piston 2 is driven by the driving device and performs linear reciprocating motion in the pump body 1, the valve core rod 4 is slidably connected to the inner wall of the piston positioning shaft 3, the valve core rod 4 is driven by the driving device and performs linear reciprocating motion in the piston positioning shaft 3. The driving device includes a first driving device and a second driving device, the power output end of the first driving device is connected to the piston 2, the power output end of the second driving device is connected to the valve core rod 4, and the first driving device and the second driving device cooperate with each other through a photoelectric position sensor 35.

[0049] The first driving device includes a motor 19, a bracket 20, an eccentric shaft 25, a rocker arm connecting rod 26, and a piston fixed shaft 27. The motor 19 is mounted on the bracket 20, and the bracket 20 is mounted on the pump body 1. The output shaft of the motor 19 is rotatably connected to the eccentric shaft 25, the eccentric shaft 25 is rotatably connected to one end of the rocker arm connecting rod 26, the other end of the rocker arm connecting rod 26 is connected to the piston fixed shaft 27, and the piston fixed shaft 27 is threadedly connected to the piston 22. The first driving device converts the rotary motion into a linear motion through the rocker arm connecting rod 26. When in use, the motor 19 is turned on, the output shaft of the motor 19 drives the eccentric shaft 25 to rotate, the eccentric shaft 25 drives one end of the rocker arm connecting rod 26 to rotate, the upper end surface of the pump body 1 is provided with a linear groove, the other end of the rocker arm connecting rod 26 drives the piston fixed shaft 27 to perform a linear reciprocating motion in the linear groove, and the piston fixed shaft 27 drives the piston 2 to perform a linear reciprocating motion in the pump body 1. The speed of the motor 19 is controllable and adjustable, so that the vacuum pumping speed can be variable, and the vacuum pumping speed can be low-speed pumping under low vacuum and high-speed pumping under high vacuum.

[0050] The second driving device includes a solenoid valve 16, a relay 34, and a photoelectric position sensor 35. A push-pull solenoid valve core 17 is installed in the solenoid valve 16, and the push-pull solenoid valve core 17 is connected to the valve core rod 4. The solenoid valve 16 is installed on the support plate 18 through the lock nut 15. The relay 34 is installed on the pump body 1 and is connected to an external power supply. The relay 34 is electrically connected to the solenoid valve 16. The photoelectric position sensor 35 is installed on the side of the eccentric shaft 25, and the photoelectric position sensor 35 is electrically connected to the relay 34. The eccentric shaft 25 has a notch, and the optical signal can pass through. The photoelectric position sensor 35 is used to receive the optical signal. During use, when the piston 2 is in the leftmost position, the eccentric shaft 25 does not block the light signal, the photoelectric position sensor 35 receives the light signal, and then gives a signal to the relay 34, so that the relay 34 closes and gives current to the solenoid valve 16, and the solenoid valve 16 pulls the push-pull solenoid valve core 17, and the push-pull solenoid valve core 17 pulls the valve core rod 4 to move to the right. When the photoelectric position sensor 35 is at the rear end of the piston 2, the eccentric shaft 25 will block the light signal. At this time, the relay 34 is disconnected, the solenoid valve 16 is powered off, and the valve core rod 4 moves to the left under the action of the spring 7.

[0051] The piston 2 parts in the vacuum acquisition device are sealed with Gly rings, and the fixed parts are sealed with O-rings to prevent gas leakage in the pump. In addition, the vacuum pump does not use liquid oil as a medium, and the lubrication part can be lubricated with food-grade fat.

[0052] The axes of the piston 2, the piston positioning shaft 3, and the valve core rod 4 are on the same straight line, which can make the vacuum pump run more smoothly.

[0053] Working principle: In actual use, first turn on the motor 19, the output shaft of the motor 19 drives the eccentric shaft 25 to rotate, the eccentric shaft 25 drives one end of the rocker arm connecting rod 26 to rotate, the other end of the rocker arm connecting rod 26 drives the piston fixed shaft 27 to move rightward, the piston fixed shaft 27 drives the piston 2 to move rightward, when the piston 2 is at the leftmost position and has not moved to the right, the photoelectric position sensor 35 receives the light signal, and then gives a signal to the relay 34, so that the relay 34 closes and gives current to the solenoid valve 16, the solenoid valve 16 pulls the push-pull solenoid valve core 17, the push-pull solenoid valve core 17 pulls the valve core rod 4 to move rapidly to the right, until the first flange 31 on the valve core rod 4 is closed with the piston positioning shaft 3, at this time, the channel between the first outer chamber 8 and the first inner chamber 9 is closed, the channel between the vacuum chamber and the first outer chamber 8 is opened, and the second flange 32 Located on the right side of the second vent hole 29, the passage between the second inner chamber 10 and the second outer chamber 12 is closed, and the passage between the first inner chamber 9 and the second inner chamber 10 is opened. As the piston 2 moves to the right, the spatial volume of the first outer chamber 8 increases to form a negative pressure to suck the gas in the vacuum chamber, and the spatial volume of the first inner chamber 9 decreases, and the gas therein is compressed. The gas in the first inner chamber 9 enters the second inner chamber 10 through the gap 37, the first vent hole 28, and the second vent hole 29, and the spatial volume of the second outer chamber 12 decreases, and the gas in the second outer chamber 12 is discharged through the exhaust channel 13. When the piston 2 moves to the far right, the spatial volume of the first inner chamber 9 is zero, and the gas in the first inner chamber 9 completely enters the second inner chamber 10. The spatial volume of the second outer chamber 12 is zero, and the gas in the second outer chamber 12 is completely discharged.

[0054] At this time, the motor 19 drives the piston 2 to start moving to the left. At the same time, the photoelectric position sensor 35 is at the rear end of the piston 2. The eccentric shaft 25 blocks the light signal, and the photoelectric position sensor 35 cannot receive the light signal. At this time, the relay 34 is disconnected, the solenoid valve 16 is powered off, and the valve core rod 4 moves rapidly to the left under the action of the spring 7 until the first flange 31 on the valve core rod 4 closes the air inlet channel 6, the channel between the first outer chamber 8 and the first inner chamber 9 is opened, and the channel between the vacuum chamber and the first outer chamber 8 is closed. The second flange 32 is located between the first vent hole 28 and the second vent hole 29, and the third flange 33 is located at the third vent hole 30. On the right side, the passage between the second inner chamber 10 and the second outer chamber 12 is opened, and the passage between the first inner chamber 9 and the second inner chamber 10 is closed. As the piston 2 moves to the left, the spatial volume of the first outer chamber 8 decreases, and the gas therein is compressed. The gas in the first outer chamber 8 enters the first inner chamber 9 through the gap 37 and the first air hole 28. The spatial volume of the second inner chamber 10 decreases, and the gas therein is compressed. The gas in the second inner chamber 10 enters the second outer chamber 12 through the second air hole 29, the third air hole 30 and the gap 37. This process moves back and forth, forming an intake and exhaust process, thereby achieving a vacuum suction effect.

[0055] Embodiment 2

[0056] The difference from the first embodiment is that, please refer to Fig.14 The power output end of the first driving device is connected to the piston 2, and the power output end of the second driving device is connected to the valve core rod 4. The first driving device and the second driving device cooperate with each other through the photoelectric position sensor 35.

[0057] The first driving device includes a cylinder 36, a bracket 20, an eccentric shaft 25, a rocker arm connecting rod 26, and a piston fixed shaft 27. The cylinder 36 is mounted on the bracket 20, and the bracket 20 is mounted on the pump body 1. The output shaft of the cylinder 36 is rotatably connected to the eccentric shaft 25, the eccentric shaft 25 is rotatably connected to one end of the rocker arm connecting rod 26, and the other end of the rocker arm connecting rod 26 is connected to the piston fixed shaft 27. The piston fixed shaft 27 is connected to the piston 22 through a threaded connection. The first driving device converts the rotary motion into a linear motion through the rocker arm connecting rod 26. When in use, the cylinder 36 is opened, the output shaft of the cylinder 36 drives the eccentric shaft 25 to rotate, the eccentric shaft 25 drives one end of the rocker arm connecting rod 26 to rotate, the upper end surface of the pump body 1 is provided with a linear groove, the other end of the rocker arm connecting rod 26 drives the piston fixed shaft 27 to perform a linear reciprocating motion in the linear groove, and the piston fixed shaft 27 drives the piston 2 to perform a linear reciprocating motion in the pump body 1.

[0058] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A vacuum pump, comprising a pump body (1), wherein a mounting cavity is provided inside the pump body (1), characterized in that: A piston (2) is installed inside the installation cavity, and the piston (2) divides the installation cavity into a first outer chamber (8) and a second outer chamber (12), wherein the first outer chamber (8) is formed by the space between the inner wall of the pump body (1) and the head of the piston (2), and the second outer chamber (12) is formed by the space between the inner wall of the pump body (1) and the tail of the piston (2); A piston cavity is provided inside the piston (2), a piston positioning shaft (3) is installed in the piston cavity, a fixing plate (38) is provided on the piston positioning shaft (3), and the fixing plate (38) divides the piston cavity into a first inner chamber (9) and a second inner chamber (10), wherein the first inner chamber (9) is formed by a space between an inner wall of the piston (2) and a front side of the fixing plate (38), and the second inner chamber (10) is formed by a space between an inner wall of the piston (2) and a rear side of the fixing plate (38); A valve core rod (4) is installed in the piston positioning shaft (3), and a driving device is connected between the valve core rod (4) and the piston (2). The driving device drives the piston (2) to reciprocate in the installation cavity, and the driving device drives the valve core rod (4) to reciprocate in the piston positioning shaft (3).

2. A vacuum pump according to claim 1, characterized in that: The piston (2) is formed by assembling piston blocks, and the piston chamber is formed by adjacent piston blocks.

3. A vacuum pump according to claim 1, characterized in that: A gap (37) is provided between the piston positioning shaft (3) and the valve core rod (4); vent holes communicating with the gap (37) are provided at intervals on the piston positioning shaft (3) in the axial direction; and flanges blocking the gap (37) are provided at intervals on the valve core rod (4).

4. A vacuum pump according to claim 3, characterized in that: The vent hole comprises a first vent hole (28), a second vent hole (29), and a third vent hole (30); the flange comprises a first flange (31), a second flange (32), and a third flange (33); the first flange (31) is located at one end of the valve core rod (4); the valve core rod (4) is in a first extreme position; the second flange (32) is located on the right side of the second vent hole (29); the third flange (33) is located on the right side of the third vent hole (30); the valve core rod (4) is in a second extreme position; the second flange (32) is located between the first vent hole (28) and the second vent hole (29); and the third flange (33) is located on the right side of the third vent hole (30).

5. A vacuum pump according to claim 1, characterized in that: The drive device comprises a first drive device and a second drive device, wherein a power output end of the first drive device is connected to the piston (2), and a power output end of the second drive device is connected to the valve core rod (4).

6. A vacuum pump according to claim 5, characterized in that: The first driving device comprises a driving member, a bracket (20), an eccentric rotating shaft (25), a rocker arm connecting rod (26), and a piston fixed shaft (27); the driving member is mounted on the bracket (20); the bracket (20) is mounted on the pump body (1); the output end of the driving member is rotationally connected to the eccentric rotating shaft (25); the eccentric rotating shaft (25) is rotationally connected to one end of the rocker arm connecting rod (26); the other end of the rocker arm connecting rod (26) is connected to the piston fixed shaft (27); and the piston fixed shaft is connected to the piston (2).

7. A vacuum pump according to claim 5 or 6, characterized in that: The second driving device comprises a solenoid valve (16), a relay (34) and a photoelectric position sensor (35); a push-pull solenoid valve core (17) is installed in the solenoid valve (16); the push-pull solenoid valve core (17) is connected to the valve core rod (4); the relay (34) is electrically connected to the solenoid valve (16); the photoelectric position sensor (35) is electrically connected to the relay (34); and the photoelectric position sensor (35) is installed on the edge of the eccentric shaft (25).

8. A vacuum pump according to claim 6, characterized in that: The driving component is a motor (19) or a cylinder (36), and the motor (19) is a speed-regulating motor.

9. A method for using the vacuum pump according to any one of claims 1 to 8, characterized in that: The following steps are involved: The valve core rod (4) and the piston (2) move to the right. During the movement, the space of the first outer chamber (8) increases to inhale external air, and the space of the first inner chamber (9) decreases to squeeze the internal air to flow to the second inner chamber (10). The space of the second inner chamber (10) increases, and the space of the second outer chamber (12) decreases to discharge the internal air to the outside until it is empty. The valve core rod (4) and the piston (2) move to the left. During the movement, the space of the first outer chamber (8) decreases, squeezing the gas inside it to flow toward the first inner chamber (9). The space of the first inner chamber (9) increases. The space of the second inner chamber (10) decreases, squeezing the gas inside it to flow toward the second outer chamber (12). The space of the second outer chamber (12) increases.

10. The method for using the vacuum pump according to claim 9, characterized in that: The valve core rod (4) moves rightward to a first extreme position, the first flange (31) and the piston positioning shaft (3) are closed, the passage between the first outer chamber (8) and the first inner chamber (9) is closed, the second flange (32) is located on the right side of the second vent hole (29), the passage between the second inner chamber (10) and the second outer chamber (12) is closed, and the passage between the first inner chamber (9) and the second inner chamber (10) is opened; The valve core rod (4) moves to the left to the second extreme position, the first flange (31) closes the air inlet passage (6), the passage between the first outer chamber (8) and the first inner chamber (9) is opened, the second flange (32) is located between the first vent hole (28) and the second vent hole (29), the third flange (33) is located on the right side of the third vent hole (30), the passage between the second inner chamber (10) and the second outer chamber (12) is opened, and the passage between the first inner chamber (9) and the second inner chamber (10) is closed.

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