Self-regulating vacuum pump

Abstract

The present application relates to the technical field of vacuum pump, particularly relates to an automatic adjusting vacuum pump, comprising a pump body, a rotor and a blade, a pump cavity is arranged in the pump body, the rotor is eccentrically arranged in the pump cavity, the rotor can rotate around its axis, the blade is slidably arranged on the rotor, the blade can rotate synchronously with the rotor and slide along the radial direction of the rotor, the present application is provided with an intermediate part, a side part, a first elastic member and a head part, the elastic force provided by the first elastic member is automatically adjusted to adaptively offset a part of centrifugal force of the side part and the head part, so that the pressure value when the head part of the blade contacts with the wall of the pump cavity is maintained within a small fluctuation range, thereby reducing local wear, reducing the probability of periodic stress and fatigue crack, thereby achieving the purpose of ensuring the long-term sealing of the pump cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum pumps, in particular to an automatic regulating vacuum pump. Background Art

[0002] A vacuum pump is a device or equipment that uses mechanical means to extract air from a container to create a vacuum. Based on its working principle and structural characteristics, it mainly includes the following types:

[0003] Reciprocating vacuum pump: Similar to a reciprocating compressor, it relies on the reciprocating motion of the piston in the cylinder to cause the volume of the pump chamber to change periodically, thereby inhaling and exhausting gas.

[0004] Rotary vane vacuum pump: There is an eccentric rotor in the pump chamber. The eccentric rotor rotates circumferentially under the drive of the motor. The rotor is equipped with blades that can slide along the radial direction of the rotor. The blades are in close contact with the inner wall of the pump chamber under the action of centrifugal force, dividing the interior of the pump chamber into multiple studios with variable volumes, and achieving air extraction through volume changes.

[0005] Among them, the rotary vane vacuum pump is a more commonly used vacuum pump in industry. Taking the automotive manufacturing industry as an example, the vacuum degree of the rotary vane vacuum pump can meet the basic vacuum requirements of most processes without the need to invest in high-cost ultra-high vacuum equipment. In addition, the rotary vane vacuum pump's fast start-up and stable pumping speed are also suitable for the continuous operation requirements of the production line.

[0006] The existing rotary vane vacuum pump has the following problems during use: during the circumferential rotation of the blades, its working principle and structural characteristics jointly cause the rotation radius of the blades to constantly change, which also causes the centrifugal force on the blades to always change, which in turn causes the pressure of the rotary vanes to be uneven at various locations around the pump chamber. Long-term uneven circumferential pressure will cause local wear of the pump chamber wall to intensify, and periodic stress and fatigue cracks to occur, which is not conducive to maintaining the long-term sealing of the pump chamber. Summary of the Invention

[0007] Based on this, it is necessary to provide an automatic regulating vacuum pump to solve the problem that the existing rotary vane vacuum pump cannot maintain the sealing of the pump chamber for a long time.

[0008] The above purpose is achieved through the following technical solutions:

[0009] An automatically regulating vacuum pump comprising:

[0010] A pump body, in which a pump cavity is defined;

[0011] The rotor is eccentrically arranged inside the pump chamber and can rotate around its axis;

[0012] The blades are slidably mounted on the rotor, and can rotate synchronously with the rotor and slide along the radial direction of the rotor;

[0013] The blade includes a middle portion, a side portion, a first elastic member and a head portion. The middle portion is slidably connected to the rotor. The side portions, the first elastic member and the head portion each have two portions. The two side portions are connected to both ends of the middle portion through the first elastic member. The head portion is connected to the end of the side portion.

[0014] The first elastic member is configured such that as the side portion moves away from the middle portion, tension of the first elastic member increases.

[0015] Preferably, the blade further comprises a second elastic member, and both ends of the second elastic member are respectively connected to the ends of the head and the side;

[0016] The stiffness coefficient of the second elastic member is smaller than the stiffness coefficient of the first elastic member;

[0017] In the initial state, the second elastic member is in a compressed state.

[0018] Preferably, it also includes a rotating support member, which includes a support ring and a connecting guide column. The support ring is rotatably arranged in an annular groove provided on the side wall of the pump chamber. The axis of the connecting guide column and the axis of the support ring are located in the same plane and are parallel to each other. One end of the connecting guide column is arranged on one circumferential side of the support ring, and the other end of the connecting guide column is inserted into the middle part.

[0019] Preferably, the pump chamber is cylindrical.

[0020] Preferably, an air inlet is provided on the outside of the pump body, and the air inlet is connected to one side of the inside of the pump chamber. An oil and gas inlet is also provided on the outside of the pump body, and the oil and gas inlet is connected to the other side of the inside of the pump chamber.

[0021] Preferably, an air inlet connector is provided in the air inlet, and a first one-way valve is provided inside the air inlet and on the inner side of the air inlet connector. The first one-way valve limits the gas inside the pump chamber from flowing out through the air inlet connector. An oil and gas connector is provided in the oil and gas inlet, and a second one-way valve is provided in the oil and gas connector. The second one-way valve limits the gas inside the pump chamber from flowing out through the oil and gas connector.

[0022] Preferably, an exhaust valve is provided on the outside of the pump body, and the exhaust valve is connected to the inside of the pump chamber;

[0023] The exhaust valve is configured so that when the internal pressure of the pump chamber is greater than a set value, the exhaust valve opens, and when the internal pressure of the pump chamber is less than or equal to the set value, the exhaust valve closes.

[0024] Preferably, a concave oil groove is provided inside the pump cavity.

[0025] Preferably, the side surface of the head that is in rotational contact with the pump chamber is an arc surface.

[0026] Preferably, the pump body is externally rotatably connected to a rotary joint, and the rotary joint is coaxially and fixedly connected to the rotor.

[0027] The beneficial effects of the present invention are:

[0028] The present invention is provided with a middle part, a side part, a first elastic part and a head part. By automatically adjusting the elastic force provided by the first elastic part, a part of the centrifugal force of the side part and the head part is adaptively offset, so that the pressure value when the head part of the blade contacts various parts of the peripheral wall of the pump chamber is maintained within a smaller fluctuation range, thereby reducing local wear and reducing the probability of periodic stress and fatigue cracks, thereby achieving the purpose of ensuring that the pump chamber maintains a long-term sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an overall schematic diagram of an automatic regulating vacuum pump of the present invention;

[0030] Figure 2 This is a front view of an automatic regulating vacuum pump of the present invention;

[0031] Figure 3 for Figure 2 Middle AA section view;

[0032] Figure 4 for Figure 2 Middle BB cross-section;

[0033] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at C in the middle;

[0034] Figure 6 This is a right side view of an automatic regulating vacuum pump of the present invention;

[0035] Figure 7 for Figure 6 Middle DD section view;

[0036] Figure 8 This is a schematic structural diagram of a blade in an automatic regulating vacuum pump of the present invention;

[0037] Figure 9 for Figure 8 Exploded view of

[0038] Figure 10 This is a cross-sectional view of an oil-gas joint in an automatic regulating vacuum pump of the present invention;

[0039] Figure 11 This is an exploded view of an oil and gas joint in an automatic regulating vacuum pump of the present invention;

[0040] Figure 12 This is a rear view of an automatic regulating vacuum pump of the present invention;

[0041] Figure 13 for Figure 12 Middle EE cross-sectional view;

[0042] Figure 14 A schematic diagram of a first state of a blade in an automatic regulating vacuum pump of the present invention;

[0043] Figure 15 A schematic diagram of a second state of a blade in an automatic regulating vacuum pump of the present invention.

[0044] in:

[0045] 100, pump body; 110, pump chamber; 120, air inlet; 130, oil and gas inlet; 140, concave oil tank; 150, exhaust hole;

[0046] 200, rotor; 210, rotary joint;

[0047] 300, blade; 310, middle portion; 320, side portion; 330, first elastic member; 340, head portion; 350, second elastic member;

[0048] 400, rotating support member; 410, supporting ring; 420, connecting guide column;

[0049] 510, air inlet connector; 520, first one-way valve; 521, first valve disc; 522, first valve hole; 523, third elastic member; 530, oil / gas connector; 540, second one-way valve; 541, valve body; 542, second valve disc; 543, fourth elastic member; 544, retaining ring; 545, second valve hole;

[0050] 600, exhaust valve; 610, spring; 620, baffle; 630, connecting pin. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0052] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings). In the description of the present invention, it should be understood that terms such as "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the device or component being referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0053] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0054] like Figures 1 to 15 As shown, an automatic regulating vacuum pump includes a pump body 100, a rotor 200 and a blade 300. A pump chamber 110 is provided in the pump body 100. The rotor 200 is eccentrically arranged inside the pump chamber 110. The rotor 200 can rotate around its axis. The blade 300 is slidingly arranged on the rotor 200. The blade 300 can rotate synchronously with the rotor 200 and slide along the radial direction of the rotor 200. Specifically, a slide groove extending along the radial direction is provided on the rotor 200. The blade 300 is slidably connected in the slide groove. The blade 300 includes an intermediate The middle portion 310, the side portion 320, the first elastic member 330 and the head portion 340, the middle portion 310 is slidably connected to the rotor 200, and there are two side portions 320, two first elastic members 330 and two heads 340. The two side portions 320 are connected to the two ends of the middle portion 310 through the first elastic member 330. The first elastic member 330 is preferably a tension spring. The head portion 340 is connected to the end of the side portion 320. The first elastic member 330 is configured so that when the side portion 320 is away from the middle portion 310, the tension of the first elastic member 330 increases.

[0055] Further, such as Figure 2 As shown, an air inlet 120 is opened on the outside of the pump body 100, and the air inlet 120 is connected to one side of the inside of the pump chamber 110. An oil and gas inlet 130 is also opened on the outside of the pump body 100, and the oil and gas inlet 130 is connected to the other side of the inside of the pump chamber 110.

[0056] Further, such as Figure 12 As shown, an exhaust valve 600 is provided on the outside of the pump body 100, and the exhaust valve 600 is connected to the inside of the pump chamber 110. The exhaust valve 600 is configured to open when the internal pressure of the pump chamber 110 is greater than the set value, and to close when the internal pressure of the pump chamber 110 is less than or equal to the set value.

[0057] During use, the staff makes the rotor 200 rotate around its axis, at which time the rotor 200 drives the blades 300 to rotate synchronously. Since the rotor 200 is eccentrically arranged in the pump chamber 110, the volume of the working chamber separated by the blades 300 changes periodically as the rotor 200 rotates, and the four-stage cycle of "intake-compression-exhaust-clearance backwash" is continuously performed. During the circumferential rotation of the rotor 200, the rotor 200 completes a pumping operation every time it rotates one circle. During the cycle, the side 320 and the head of the blade 300 are compressed. The head 340 of the blade 300 is moved in the direction close to the peripheral wall of the pump chamber 110 by the centrifugal force. Since the distance between the axis of the rotor 200 and the peripheral wall of the pump chamber 110 is not the same at all, the distance that the side 320 and the head 340 of the blade 300 are moved in the direction close to the peripheral wall of the pump chamber 110 by the centrifugal force is constantly changing, which makes the length of the first elastic member 330 periodically extend or shorten. When the blade 300 rotates with the rotor 200 to the position where the head 340 is far away from the axis of the rotor 200, When the rotor 200 rotates, the head portion 340 and the corresponding side portion 320 of the blade 300 have a larger rotation radius and are therefore subjected to a larger centrifugal force. At the same time, because the side portion 320 and the head portion 340 of the blade 300 move a longer distance toward the peripheral wall of the pump chamber 110 under the action of the centrifugal force, the elongation of the first elastic member 330 automatically increases, thereby increasing the elastic force of the first elastic member 330. The direction of the elastic force provided by the first elastic member 330 is opposite to the direction of the centrifugal force applied to the head portion 340. Therefore, the elastic force provided by the first elastic member 330 can offset a portion of the centrifugal force, thereby preventing excessive contact pressure between the head portion 340 and the inner wall of the pump chamber 110. As the rotor 200 continues to rotate, when the head portion 340 rotates to a position closer to the axis of the rotor 200, the centrifugal force applied to the head portion 340 and the corresponding side portion 320 is smaller. At this time, the elastic force provided by the first elastic member 330 also decreases accordingly, thereby preventing the contact pressure between the head portion 340 and the inner wall of the pump chamber 110 from decreasing excessively. In summary, by automatically adjusting the elastic force provided by the first elastic member 330, a portion of the centrifugal force of the blade 300 is adaptively offset, so that the pressure value when the head 340 of the blade 300 contacts the peripheral wall of the pump chamber 110 is maintained within a smaller fluctuation range, thereby reducing local wear and reducing the probability of periodic stress and fatigue cracks, thereby achieving the purpose of ensuring that the pump chamber 110 maintains its sealing for a long time.

[0058] Intake stage: after the rotation of the rotor 200, the rotor 200 drives the blades 300 to rotate synchronously, under the action of centrifugal force, the two side parts 320 and the corresponding head parts 340 connected therewith are away from the middle part 310, so that the first elastic members 330 are stretched, the elastic force of the first elastic members 330 is increased, at this time, the head parts 340 of the blades 300 are tightly attached to the circumferential wall of the pump cavity 110 under the action of the combined force of the centrifugal force and the elastic force, the circumferential wall of the pump cavity 110 is divided into a first working cavity and a second working cavity, when the first working cavity gradually moves away from the intake port 120 with the rotation of the rotor 200, the volume thereof gradually increases, the internal pressure gradually decreases below the pressure of the system to be pumped, under the action of negative pressure, the gas in the system to be pumped enters the first working cavity through the intake port 120, and the intake process is completed.

[0059] Compression stage: with the continuous rotation of the rotor 200, the first working cavity is gradually isolated from the intake port 120 and begins to be pushed by the blades 300 to the position where the exhaust valve 600 is located, in this process, the volume of the first working cavity gradually decreases, and the gas in the first working cavity is compressed due to the decrease in the volume of the first working cavity, so the pressure of the gas in the first working cavity gradually increases.

[0060] Exhaust stage: with the continuous rotation of the rotor 200, when the pressure of the gas in the first working cavity increases to be sufficient to push away the exhaust valve 600 (i.e. reaches a set value), the compressed gas is discharged from the pump cavity 110 through the exhaust valve 600, the volume of the first working cavity is further reduced (to a minimum close to the clearance volume), and at the same time, the second working cavity on the other side begins to enter the intake stage (repeating the intake process of the first working cavity), realizing continuous pumping.

[0061] Clearance backflushing stage: after the exhaust is completed, a small amount of gas remains in the first working cavity (existing in the small "clearance volume" at the end of the blade 300 and the pump cavity 110), with the continuous rotation of the rotor 200, the first working cavity is isolated from the exhaust valve 600 and begins to communicate with the working cavity of the next intake stage, at this time, the high-pressure gas in the clearance expands due to the sudden expansion of the volume, the pressure decreases, avoiding the high-pressure backflushing of the residual gas to the intake side and affecting the vacuum degree.

[0062] In order to enable the rotor 200 to rotate around its axis, further, as shown in Figure 3 , a rotating joint 210 is rotatably connected to the outside of the pump body 100, the rotating joint 210 is fixedly connected with the rotor 200 coaxially, and the rotating joint 210 is fixedly connected with the output shaft of the motor. In use, the motor is started, the output shaft of the motor drives the rotating joint 210 to rotate circumferentially, the rotating joint 210 drives the rotor 200 to rotate synchronously, so that the rotor 200 rotates around its axis.

[0063] It can be understood that the oil and gas inlet 130 is provided in order to replenish lubricating oil into the pump chamber 110 to reduce the friction between the head 340 of the blade 300 and the peripheral wall of the pump chamber 110. The air intake principle is the same as that of the air inlet 120. When the first working chamber gradually moves away from the oil and gas inlet 130 as the rotor 200 rotates, the volume of the first working chamber increases, and the internal pressure gradually becomes lower than the oil and gas system pressure. At this time, the oil and gas mixture in the oil and gas system enters the first working chamber through the oil and gas inlet 130. As the rotor 200 continues to rotate, the first working chamber is gradually isolated from the oil and gas inlet 130 and begins to be pushed by the blade 300 to the position of the exhaust valve 600. In this process, the volume of the first working chamber gradually decreases. , the internal gas pressure gradually increases. At this time, part of the oil-gas mixture in the first working chamber is liquefied into lubricating oil due to the pressure increase. The liquefied lubricating oil adheres to the peripheral wall of the pump chamber 110 under the action of centrifugal force, so that the lubricating oil can be added between the head 340 and the pump chamber 110. The friction between the head 340 and the peripheral wall of the pump chamber 110 is reduced by oil lubrication. As the rotor 200 continues to rotate, when the gas pressure in the first working chamber increases to a level sufficient to push open the exhaust valve 600, the compressed gas is discharged from the pump chamber 110 through the exhaust valve 600, and the volume of the first working chamber is further reduced to a minimum. At the same time, the second working chamber on the other side begins to enter the intake stage (repeating the intake process of the first working chamber), realizing continuous air extraction.

[0064] Further, such as Figure 12 and Figure 13 As shown, the exhaust valve 600 includes a spring piece 610, a baffle 620 and a connecting pin 630. An exhaust hole 150 is opened on the pump body 100, and the exhaust hole 150 is communicated with the pump chamber 110. The connecting pin 630 is fixedly connected to the pump body 100. The spring piece 610 and the baffle 620 are sequentially sleeved on the connecting pin 630 from the outside to the inside. In the initial state, the spring piece 610 blocks the exhaust hole 150. When the pressure in the pump chamber 110 is greater than the elastic force of the spring piece 610, the spring piece 610 is forced to bend outward to open the exhaust hole 150. At this time, the air in the pump chamber 110 can be discharged outward through the exhaust hole 150.

[0065] It should be added that the blocking piece 620 is provided to limit the spring piece 610 to prevent the spring piece 610 from being excessively deformed and damaged.

[0066] It should also be noted that in order to ensure the sealing of the first working chamber and the second working chamber, the middle part 310 and the side parts 320 should be slidingly sealed with each other, and the side parts 320 and the head part 340 should be slidingly sealed with each other, and the sliding sealing surface should be as smooth as possible to reduce friction.

[0067] In a further embodiment, Figure 9As shown, the blade 300 also includes a second elastic member 350, which is a compression spring. The two ends of the second elastic member 350 are respectively connected to the ends of the head 340 and the side 320. The stiffness coefficient of the second elastic member 350 is smaller than the stiffness coefficient of the first elastic member 330. In the initial state, the second elastic member 350 is in a compressed state.

[0068] Since the second elastic member 350 is in a compressed state in the initial state, when the rotor 200 rotates at a low speed, the elastic force of the second elastic member 350 can push the head 340 to press against the peripheral wall of the pump chamber 110 with a certain pre-tightening force, thereby avoiding the first working chamber and the second working chamber from being poorly sealed.

[0069] It is understandable that the purpose of making the stiffness coefficient of the second elastic member 350 smaller than that of the first elastic member 330 is to prevent the second elastic member 350 from pushing the side portion 320 in the opposite direction and causing the first elastic member 330 to bend in the initial state.

[0070] In a further embodiment, Figure 3 、 Figure 8 and Figure 9 As shown, the automatic regulating vacuum pump also includes a rotating support member 400, which includes a support ring 410 and a connecting guide column 420. The support ring 410 is rotatably arranged in an annular groove provided on the side wall of the pump chamber 110. The axis of the connecting guide column 420 and the axis of the support ring 410 are located in the same plane and are parallel to each other. One end of the connecting guide column 420 is arranged on one circumferential side of the support ring 410, and the other end of the connecting guide column 420 is inserted into the middle part 310.

[0071] By providing a support ring 410 and a connecting guide column 420, a dynamic limiting support is formed for the movement of the middle part 310. In this way, when the middle part 310 moves along the slide groove, part of the momentum of the middle part 310 is borne by the support ring 410 through the connecting guide column 420, which is beneficial to further reduce the fluctuation range of the contact pressure between the head 340 and the peripheral wall of the pump chamber 110, so that the pump chamber 110 can maintain its sealing for a longer time.

[0072] In a further embodiment, the pump chamber 110 is cylindrical. Compared with the traditional elliptical structure design, the cylindrical pump chamber 110 is easier to process, which helps to reduce production costs.

[0073] In a further embodiment, Figure 2 、 Figure 4 、 Figure 5 、 Figure 10 and Figure 11As shown, an air intake connector 510 is provided in the air intake port 120, and a first one-way valve 520 is provided inside the air intake port 120 and on the inner side of the air intake connector 510. The first one-way valve 520 limits the gas inside the pump chamber 110 from flowing out through the air intake connector 510. An oil and gas connector 530 is provided in the oil and gas inlet 130, and a second one-way valve 540 is provided in the oil and gas connector 530. The second one-way valve 540 limits the gas inside the pump chamber 110 from flowing out through the oil and gas connector 530.

[0074] An air inlet connector 510 is provided for connecting to the gas outlet of the pumped air system, a first one-way valve 520 is provided to prevent the gas in the working chamber from flowing back into the pumped air system, an oil-gas connector 530 is provided for connecting to the oil-gas outlet of the oil-gas system, and a second one-way valve 540 is provided to prevent the gas in the working chamber from flowing back into the oil-gas system.

[0075] Further, such as Figure 4 and Figure 5 As shown, the first one-way valve 520 includes a first valve plate 521 and a third elastic member 523. One end of the third elastic member 523 is fixedly connected to the air inlet 120, and the other end of the third elastic member 523 is fixedly connected to the first valve plate 521. A first valve hole 522 is opened on the first valve plate 521. In the initial state, the first valve hole 522 is blocked by the cavity wall of the air inlet 120. At this time, the air pumping system and the working chamber are in an isolated state. When the negative pressure in the working chamber is sufficient to compress the third elastic member 523, the third elastic member 523 is compressed, and the first valve plate 521 moves synchronously with the third elastic member 523. At this time, the first valve hole 522 is no longer blocked by the cavity wall of the air inlet 120. At this time, the air pumping system and the working chamber are in a connected state, and the gas in the air pumping system is pumped into the working chamber through the first valve hole 522.

[0076] Further, such as Figure 10 and Figure 11As shown, the second one-way valve 540 includes a valve body 541, a second valve disc 542, a fourth elastic member 543 and a retaining ring 544. The valve body 541 has a large end and a small end. The large end of the valve body 541 is fixedly arranged in the oil and gas joint 530. The retaining ring 544 is installed inside the large end of the valve body 541, and the retaining ring 544 is against the bottom of the oil and gas joint 530. One end of the fourth elastic member 543 is fixedly connected to the retaining ring 544, and the other end of the fourth elastic member 543 is fixedly connected to the second valve disc 542. The outside of the second valve disc 542 is provided with a fourth elastic member 543. The second valve hole 545 is initially blocked by the cavity wall of the oil-gas connector 530. At this time, the oil-gas system and the working chamber are in an isolated state. When the negative pressure in the working chamber is sufficient to compress the fourth elastic member 543, the fourth elastic member 543 is compressed, and the second valve plate 542 moves synchronously with the fourth elastic member 543. At this time, the second valve hole 545 is no longer blocked by the oil-gas connector 530. At this time, the oil-gas system and the working chamber are in a connected state, and the oil-gas mixture in the oil-gas system is drawn into the working chamber through the second valve hole 545.

[0077] In a further embodiment, Figure 7 As shown, a concave oil groove 140 is defined inside the pump chamber 110 .

[0078] The purpose of providing the concave oil groove 140 is to reserve space for storing a certain amount of lubricating oil and to prevent the oil film formed on the peripheral wall of the pump chamber 110 from being too thick.

[0079] In a further embodiment, Figure 9 As shown, the side surface of the head 340 that is in rotational contact with the pump chamber 110 is an arc surface.

[0080] The side surface of the head 340 that is in rotational contact with the pump chamber 110 is an arc surface to ensure a close fit with the peripheral wall of the pump chamber 110 and improve the sealing performance. In addition, it can also reduce friction and wear and extend the service life.

[0081] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-described embodiments merely illustrate several embodiments of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An automatic regulating vacuum pump, characterized in that: include: A pump body, in which a pump cavity is defined; The rotor is eccentrically arranged inside the pump chamber and can rotate around its axis; The blades are slidably mounted on the rotor, and can rotate synchronously with the rotor and slide along the radial direction of the rotor; The blade includes a middle portion, a side portion, a first elastic member and a head portion. The middle portion is slidably connected to the rotor. The side portions, the first elastic member and the head portion each have two portions. The two side portions are connected to both ends of the middle portion through the first elastic member. The head portion is connected to the end of the side portion. The first elastic member is configured such that when the side portion moves away from the middle portion, the tension of the first elastic member increases; the blade further comprises a second elastic member, the two ends of the second elastic member being connected to the ends of the head portion and the side portion respectively; The stiffness coefficient of the second elastic member is smaller than the stiffness coefficient of the first elastic member; In the initial state, the second elastic member is in a compressed state.

2. An automatic regulating vacuum pump according to claim 1, characterized in that: It also includes a rotating support member, which includes a support ring and a connecting guide column. The support ring is rotatably arranged in an annular groove provided on the side wall of the pump chamber. The axis of the connecting guide column and the axis of the support ring are located in the same plane and are parallel to each other. One end of the connecting guide column is arranged on one circumferential side of the support ring, and the other end of the connecting guide column is inserted into the middle part.

3. The automatic regulating vacuum pump according to claim 1, characterized in that: The pump chamber is cylindrical.

4. The automatic regulating vacuum pump according to claim 1, characterized in that: An air inlet is provided on the outside of the pump body, and the air inlet is connected to one side of the inside of the pump chamber. An oil and gas inlet is also provided on the outside of the pump body, and the oil and gas inlet is connected to the other side of the inside of the pump chamber.

5. The automatic regulating vacuum pump according to claim 4, characterized in that: An air intake connector is provided in the air intake port, and a first one-way valve is provided inside the air intake port and on the inner side of the air intake connector. The first one-way valve limits the gas inside the pump chamber from flowing out through the air intake connector. An oil and gas connector is provided in the oil and gas inlet port, and a second one-way valve is provided in the oil and gas connector. The second one-way valve limits the gas inside the pump chamber from flowing out through the oil and gas connector.

6. The automatic regulating vacuum pump according to claim 1, characterized in that: An exhaust valve is provided on the outside of the pump body and is communicated with the inside of the pump chamber; The exhaust valve is configured so that when the internal pressure of the pump chamber is greater than a set value, the exhaust valve opens, and when the internal pressure of the pump chamber is less than or equal to the set value, the exhaust valve closes.

7. The automatic regulating vacuum pump according to claim 1, characterized in that: A concave oil groove is provided inside the pump cavity.

8. The automatic regulating vacuum pump according to claim 1, characterized in that: The side surface of the head that is in rotational contact with the pump chamber is an arc surface.

9. The automatic regulating vacuum pump according to claim 1, characterized in that: The pump body is externally rotatably connected with a rotary joint, which is coaxially fixedly connected to the rotor.

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