CN114151309A

CN114151309A - Shock-proof type vacuum pump

Info

Publication number: CN114151309A
Application number: CN202111481625.0A
Authority: CN
Inventors: 黄立福; 陆江艺; 黄春雨
Original assignee: Dongguan Fuyunlai Vacuum Technology Co ltd
Current assignee: Dongguan Fuyunlai Vacuum Technology Co ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-03-08

Abstract

The invention discloses a shock-absorbing vacuum pump, which belongs to the technical field of vacuum pumps and comprises a protective box body and a box cover, wherein a guide seat is arranged at the lower end part of an inner cavity of the protective box body, a support plate is movably inserted at the upper end part of the guide seat, guide chutes are symmetrically arranged at the left and right end parts of the support plate, an extrusion cylinder is fixedly arranged on the front end surface of the support plate, the front and rear end parts of the extrusion cylinder are respectively communicated with an air suction pipe and an exhaust pipe, sliding rods are symmetrically inserted at the left and right end parts of the extrusion cylinder, limit rods are fixedly inserted on the sliding rods, a second piston cylinder and a first piston cylinder are sequentially arranged at the left and right sides of the inner cavity of the protective box body from bottom to top, the second piston cylinder and the first piston cylinder are communicated through a first connecting pipe, a device is hinged at the inner end part of the first piston cylinder, and an adjusting device is communicated at the lower end part of the shock-absorbing box through a second connecting pipe, and the damping intensity of the vacuum pump can be adjusted according to the requirement.

Description

Shock-proof type vacuum pump

Technical Field

The invention relates to the technical field of vacuum pumps, in particular to a damping type vacuum pump.

Background

The vacuum pump is used for generating negative pressure, so that the braking force is increased. The vacuum pump of the automobile generator is generally an oil pump, namely a vacuum pump core and a generator shaft rotate together, and negative pressure is generated in a pump shell of the vacuum pump through continuous oil absorption and oil pumping. It refers to a device or apparatus that uses mechanical, physical, chemical or physicochemical methods to evacuate a container to obtain a vacuum.

The vacuum pump is easy to generate vibration in the use process, so that the noise in the surrounding environment is relatively high. The existing vacuum pump damping device only can achieve the effect of inhibiting the vibration of the vacuum pump from top to bottom, and does not effectively solve the problem of the vibration of the vacuum pump from left to right.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a damping type vacuum pump, which can effectively solve the problem that the existing vacuum pump only can realize the effect of inhibiting the vertical vibration of the vacuum pump, but cannot effectively inhibit the horizontal vibration of the vacuum pump.

2. Technical scheme

In order to solve the problems, the invention adopts the following technical scheme:

a shock-absorbing vacuum pump comprises a protective box body and a box cover, wherein a guide seat is arranged at the lower end part of an inner cavity of the protective box body, a support plate is movably inserted at the upper end part of the guide seat, guide chutes are symmetrically formed in the left end part and the right end part of the support plate, an extrusion cylinder is fixedly installed on the front end surface of the support plate, the front end part and the rear end part of the extrusion cylinder are respectively communicated with an air suction pipe and an exhaust pipe, a sliding rod is symmetrically inserted at the left end part and the right end part of the extrusion cylinder, a limiting rod is fixedly inserted on the sliding rod, a second piston cylinder and a first piston cylinder are sequentially installed on the left side and the right side of the inner cavity of the protective box body from bottom to top, the second piston cylinder is communicated with the first piston cylinder through a first connecting pipe, and an inner end part of the first piston cylinder is hinged with a shock-absorbing device;

the anti-seismic device comprises a shock absorption box, an upper cavity barrel and a lower cavity barrel which are respectively hinged with the upper end and the lower end of the inner cavity of the shock absorption box, wherein the inner cavities of the upper cavity barrel and the lower cavity barrel are respectively and movably connected with an upper push barrel and a lower push barrel, the upper push barrel is connected with the upper cavity barrel through a fourth spring, the lower push barrel is connected with the lower cavity barrel through a third spring, the inner parts of the upper push barrel and the lower push barrel are respectively and movably connected with an upper piston rod and a lower piston rod, the inner end parts of the upper piston rod and the lower piston rod are respectively and fixedly arranged on an insertion barrel, the inner side and the outer side of the insertion barrel are respectively and movably inserted with a second sliding block and a first sliding block, a first spring and a second spring are respectively arranged between the first sliding block and the second sliding block and the insertion barrel, the first sliding block is fixedly arranged on the shock absorption box, the inner end part of the shock absorption box is movably inserted with a guide rod, and the second sliding block is movably sleeved on the guide rod, and a profiling block is fixedly arranged at the inner end part of the guide rod.

The adjusting device comprises an oil tank, the shock absorption tanks are communicated with the oil tank through second connecting pipes, the upper end parts of the oil tanks are movably inserted with inserting rods, balancing weights are movably sleeved on the upper end parts of the inserting rods, and the oil tank is arranged between the adjacent shock absorption tanks.

Preferably, the right end part of the second piston cylinder is fixedly installed with the sliding rod.

Preferably, the air suction pipe and the air exhaust pipe are both provided with one-way valves.

Preferably, the opposite ends of the upper cavity barrel and the lower cavity barrel are both open, the inner diameter of the upper cavity barrel is equal to the outer diameter of the upper push barrel, and the inner diameter of the lower cavity barrel is equal to the outer diameter of the lower push barrel.

Preferably, the first sliding block and the second sliding block are both in a T shape.

Preferably, the limiting rod is movably connected in the groove of the guide chute, and the outer diameter of the limiting rod is equal to the groove width of the guide chute.

Preferably, the first piston cylinder, the second piston cylinder and the extrusion cylinder body are communicated.

Preferably, a support plate for mounting the second piston cylinder is arranged on the protective box body, and the upper end face of the support plate is in sliding contact with the lower end face of the sliding rod.

Preferably, the upper piston rod and the lower piston rod are respectively clamped on the upper push cylinder and the lower push cylinder in a T shape.

3. Advantageous effects

(1) According to the invention, the anti-vibration device is arranged, when the vacuum pump is subjected to action force to generate vertical vibration, the lower push cylinders positioned at two sides of the vacuum pump can be upwards pumped out from the interior of the lower cavity cylinder at the same time, oil in the shock absorption box is extruded and enters the oil tank through the second connecting pipe, and similarly, the lower push cylinders positioned at two sides of the vacuum pump can be downwards pumped out from the interior of the upper cavity cylinder by downward vibration, and the oil in the shock absorption box is extruded and enters the oil tank; and receive the effort when the vacuum pump, and when producing vibrations about, vibrations left, be located the left guide bar of vacuum pump and promote first sliding block extrusion first spring and take out from a grafting section of thick bamboo left, the inside fluid entering oil tank of extrusion surge tank, meanwhile, the second sliding block extrusion second spring on guide bar pulling vacuum pump right side that is located the vacuum pump right side, the second sliding block moves left in the grafting section of thick bamboo on right side from, also can extrude the inside fluid entering oil tank of surge tank, get into the inside fluid of oil tank, when getting into fluid, then need resist and come from the downward effort of balancing weight, so set up, can play the inhibitory effect to the vibrations of vacuum pump, when to the vacuum pump absorbing, the noise in the vacuum pump use has been reduced.

(2) According to the invention, the adjusting device is installed, the inserting rod in a cross shape is movably inserted in the oil tank, the annular balancing weight is sleeved on the inserting rod, when oil enters the oil tank, downward acting force from the balancing weight needs to be resisted, the balancing weight is directly sleeved above the inserting rod, and the shock strength of the vacuum pump can be adjusted by replacing the balancing weights in different specifications.

(3) According to the invention, by installing the extrusion cylinder, the sliding rods, the limiting rods, the guide chute and the support plate structure, when the support plate is acted by an acting force to drive the two adjacent sliding rods to move relatively, when the two adjacent sliding rods move inwards simultaneously, due to the arrangement of the one-way valve on the air suction pipe, air in the extrusion cylinder can be extruded into the exhaust pipe, and air is blown into the protection box body through the exhaust pipe, so that the heat dissipation of the vacuum pump can be assisted; on the contrary, when two adjacent slide bars outwards moved simultaneously, because the check valve setting on the blast pipe, when the inside negative pressure state that forms gradually of extrusion barrel, inside sucking the extrusion barrel through the breathing pipe with gas, the work of supplementary vacuum pump reduces the consumption of partial energy.

Drawings

FIG. 1 is a schematic left side view of the structure of the present invention

FIG. 2 is a schematic cross-sectional view A-A of the structure of the present invention;

FIG. 3 is a schematic view of the connection of the anti-seismic device and the adjustment device of the present invention;

FIG. 4 is a rear view of the structural support panel of the present invention;

fig. 5 is a top view of the extrusion cylinder of the present invention.

Reference numerals: 1. a protective box body; 2. a box cover; 3. an anti-seismic device; 300. a plug-in barrel; 301. a contour block; 302. a first spring; 303. a second slider; 304. a second spring; 305. a first slider; 306. a guide bar; 31. a damper box; 32. an upper cavity cylinder; 33. a lower cavity cylinder; 34. a lower push cylinder; 35. pushing the barrel upwards; 36. an upper piston rod; 37 lower piston rods; 38. a third spring; 39. a fourth spring; 4. a support plate; 5. extruding the cylinder; 6. a slide bar; 7. an air intake duct; 8. an exhaust pipe; 9. an adjustment device; 90. inserting a rod; 91 a balancing weight; 92 oil tank; 10. a first piston cylinder; 11. a guide seat; 12. a limiting rod; 13. a guide chute; 14. a first connecting pipe; 15. a second connecting pipe; 16. a second piston cylinder; 17. and (4) a support plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, an embodiment of the present invention is shown:

the utility model provides a shock-proof type vacuum pump, includes protection box 1 and case lid 2, wherein, protection box 1 and case lid 2 pass through hinged joint. The lower tip is equipped with guide holder 11 under the protection box 1 inner chamber, and the activity of guide holder 11 upper end is pegged graft and is had backup pad 4, and guide holder 11 passes through screw fixed mounting on protection box 1, and the setting of guide holder 11 can play the effect of direction to the up-and-down motion of backup pad 4. The front end face of the supporting plate 4 is fixedly provided with an extrusion cylinder 5, the front end part and the rear end part of the extrusion cylinder 5 are respectively communicated with an air suction pipe 7 and an air exhaust pipe 8, and the air suction pipe 7 and the air exhaust pipe 8 are respectively provided with a one-way valve. The air suction pipe 7 is used for connecting a working end pipeline of a vacuum pump, the exhaust pipe 8 is directly communicated with the interior of the protective box body 1, the sliding rods 6 are symmetrically inserted into the left end part and the right end part of the extrusion cylinder body 5, when two adjacent sliding rods 6 move inwards simultaneously, due to the arrangement of the check valve on the air suction pipe 7, air in the extrusion cylinder body 5 can be extruded into the exhaust pipe 8, air is blown into the protective box body 1 through the exhaust pipe 8, and the heat dissipation of the vacuum pump can be assisted; on the contrary, when two adjacent slide bars 6 outwards move simultaneously, because the check valve setting on the blast pipe 8, when extrusion barrel 5 is inside to form negative pressure state gradually, inhale extrusion barrel 5 inside through breathing pipe 7 with gas, the work of supplementary vacuum pump reduces the consumption of partial energy. A limiting rod 12 is fixedly inserted on the sliding rod 6, the limiting rod 12 is movably connected in a groove of the guide chute 13, and the outer diameter of the limiting rod 12 is equal to the groove width of the guide chute 13. The left end and the right end of the supporting plate 4 are symmetrically provided with guide chutes 13, and the guide chutes 13 are inverted splay-shaped. So design, in the process of backup pad 4 downstream, the interval of adjacent gag lever post 12 increases, and the same reason is opposite, in the process of backup pad 4 upstream, the interval of adjacent gag lever post 12 reduces.

Referring to fig. 2, the second piston cylinder 16 and the first piston cylinder 10 are sequentially installed on the left side and the right side of the inner cavity of the protective box body 1 from bottom to top, and the first piston cylinder 10, the second piston cylinder 16 and the extrusion cylinder 5 are all communicated. The first piston cylinder 10 is arranged above the second piston cylinder 16, and the first piston cylinder 10 and the second piston cylinder 16 are both fixed with the protection box body 1. A support plate 17 for mounting the second piston cylinder 16 is arranged on the protective box body 1, the support plate 17 is horizontally arranged, and the upper end surface of the support plate 17 is in sliding contact with the lower end surface of the sliding rod 6. The lower end surface of the sliding rod 6 is contacted with the upper end surface of the support plate 17, and the left and right movement guiding and limiting functions of the sliding rod 6 can also be realized. The second piston cylinder 16 is communicated with the first piston cylinder 10 through a first connecting pipe 14, and the right end part of the second piston cylinder 16 is fixedly arranged with the sliding rod 6. The inner end part of the first piston cylinder 10 is hinged with an anti-seismic device 3;

referring to fig. 3, the anti-seismic device 3 includes a damper box 31, and an upper chamber tube 32 and a lower chamber tube 33 respectively hinged to upper and lower ends of an inner cavity of the damper box 31, wherein the upper chamber tube 32 and the lower chamber tube 33 are respectively disposed at upper and lower ends of the damper box 31, and the upper chamber tube 32 and the lower chamber tube 33 are both connected to the damper box 31 in a hinged manner, wherein opposite ends of the upper chamber tube 32 and the lower chamber tube 33 are both open, an inner diameter of the upper chamber tube 32 is equal to an outer diameter of the upper push tube 35, and an inner diameter of the lower chamber tube 33 is equal to an outer diameter of the lower push tube 34. The inner cavities of the upper cavity barrel 32 and the lower cavity barrel 33 are respectively and movably connected with an upper push barrel 35 and a lower push barrel 34, wherein the opposite end parts of the upper push barrel 35 and the lower push barrel 34 are opened, the inner diameters of the opposite end parts of the upper push barrel 35 and the lower push barrel 34 are smaller than the inner diameters of the outer end parts of the upper push barrel 35 and the lower push barrel 34, the upper push barrel 35 is connected with the upper cavity barrel 32 through a fourth spring 39, the lower push barrel 34 is connected with the lower cavity barrel 33 through a third spring 38, the inner end part and the outer end part of the fourth spring 39 are respectively fixed on the upper cavity barrel 32 and the upper push barrel 35, the inner end part and the outer end part of the third spring 38 are respectively and fixedly arranged on the lower cavity barrel 33 and the lower push barrel 34, the reset of the upper push barrel 35 and the lower push barrel 34 can be facilitated through the elastic force action of the third spring 38 and the fourth spring 39, the upper push barrel 35 is ensured to be positioned at one end part of the upper cavity barrel 32 close to the plug-in 300, the lower push barrel 34 is positioned at one end part of the lower cavity barrel 33 close to the plug-in 300, the upper piston rod 36 and the lower piston rod 37 are movably connected inside the upper push cylinder 35 and the lower push cylinder 34 respectively, and the upper piston rod 36 and the lower piston rod 37 are clamped on the upper push cylinder 35 and the lower push cylinder 34 respectively in a T shape. The inner ends of the upper piston rod 36 and the lower piston rod 37 are fixedly arranged on the plug-in cylinder 300, the upper and lower positions of the upper piston rod 36 and the lower piston rod 37 correspond to each other, and the upper piston rod 36 and the lower piston rod 37 are not communicated with the inner diameter of the plug-in cylinder 300. The inside and outside of the inserting cylinder 300 are respectively movably inserted with a second sliding block 303 and a first sliding block 305, a first spring 302 and a second spring 304 are respectively arranged between the first sliding block 305 and the inserting cylinder 300 and between the second sliding block 303 and the inserting cylinder 300, the first sliding block 305 is fixedly arranged on the shock absorption box 31, the inner end part of the shock absorption box 31 is movably inserted with a guide rod 306, the second sliding block 303 is movably sleeved on the guide rod 306, and the inner end part of the guide rod 306 is fixedly provided with a profile block 301. Wherein, the profile modeling piece 301 is flexible rubber, and the elastic action of flexible rubber can make profile modeling piece 301 laminate with the vacuum pump more, has ensured the fixed effect of joint of vacuum pump. When the vacuum pump is acted by an acting force to generate vertical vibration, the vertical vibration is performed upwards, the lower push cylinders 34 positioned on two sides of the vacuum pump can be simultaneously upwards pumped out from the interior of the lower cavity cylinder 33, the oil liquid in the shock absorption box 31 is extruded and enters the oil tank 92 through the second connecting pipe 15, and similarly, the vertical vibration can be performed downwards, the upper push cylinders 35 positioned on two sides of the vacuum pump can be downwards pumped out from the interior of the upper cavity cylinder 32, and the oil liquid in the shock absorption box 31 is extruded and enters the oil tank 92; and when the vacuum pump receives the effort, and when producing vibrations about, vibrations left, be located the left guide bar 306 of vacuum pump and promote first sliding block 305 and extrude first spring 302 and take out from a grafting section of thick bamboo 300 left, extrude the inside fluid entering oil tank 92 of surge tank 31, meanwhile, be located the right guide bar 306 of vacuum pump and pull the second sliding block 303 extrusion second spring 304 on vacuum pump right side, second sliding block 303 is from the interior leftward movement of a grafting section of thick bamboo 300 on right side, also can extrude the inside fluid entering oil tank 92 of surge tank 31 in, get into the inside fluid of oil tank 92, when getting into fluid, then need resist and come from the downward effort of balancing weight, so set up, can play the inhibitory effect to the vibrations of vacuum pump.

Wherein, adjusting device 9 includes oil tank 92, surge tank 31 passes through second connecting pipe 15 and oil tank 92 intercommunication, tip all communicates second connecting pipe 15 about oil tank 92, second connecting drum 15 is the hose, the setting of second connecting pipe 15 can play the effect with oil tank 92 and the inside intercommunication of surge tank 31, the activity of oil tank 92 upper end is pegged graft and is had inserted bar 90, the activity of inserted bar 90 upper end has cup jointed balancing weight 91, oil tank 92 locates between the adjacent surge tank 31. Wherein, inserted bar 90 is "ten" font, and the lower tip activity of inserted bar 90 is pegged graft in the inside of oil tank 92, when oil tank 92 is inside gets into fluid, need resist and come from balancing weight 91 effort downwards, and balancing weight 91 is the ring shape, directly cup joints it in inserted bar 90's top, through the balancing weight 91 of changing different specifications, can adjust the antidetonation effect of vacuum pump.

The working principle is as follows: when the vacuum pump vibrates upwards, the components in the anti-vibration devices 3 positioned at two sides of the vacuum pump move, the upper piston rod 36 positioned at the upper end part of the inner cavity of the shock absorption box 31 is inserted into the upper push cylinder 35, the lower piston rod 37 pulls the lower push cylinder 34 to slide out of the inner cavity of the lower cavity cylinder 33 upwards, the inner part of the oil tank 92 of the shock absorption box 31 can be pushed, the oil tank 92 is used for balancing weight to resist the upward acting force of the vacuum pump until the vibration amplitude stops, and the upper push cylinder 35 and the lower push cylinder 34 are reset through the action of the third spring 38 and the fourth spring 39; similarly, when the vacuum pump vibrates downwards, the lower piston rod 37 at the lower end part of the inner cavity of the shock absorption box 31 is inserted into the lower push cylinder 34, the upper piston rod 36 pulls the upper push cylinder 35 to slide out of the inner cavity of the upper cylinder 32 downwards, the inner part of the oil tank 92 of the shock absorption box 31 can be pushed, and the upward acting force of the vacuum pump is resisted by the counterweight of the oil tank 92 until the vibration amplitude stops; when the vacuum pump generates left-right vibration, the vibration can be decomposed into left-right micro-motion of the vacuum pump to illustrate, when the vacuum pump moves to the left, the guide rod 306 on the left side of the vacuum pump pushes the first sliding block 305 to extrude the first spring 302, meanwhile, the guide rod 306 on the right side of the vacuum pump pulls the second sliding block 303 on the right side of the vacuum pump to extrude the second spring 304, in the process, the first sliding block 305 on the left side and the second sliding block 303 on the right side can move to extrude the oil in the shock absorption box 31 into the oil tank 92, the same is the opposite, when the vacuum pump moves to the right, the guide rod 306 on the right side of the vacuum pump pushes the first sliding block 305 to extrude the first spring 302, pulls down the second sliding block 303 on the left side of the vacuum pump to extrude the second spring 304, and extrudes the oil in the shock absorption box 31 into the oil tank 92.

When the vertical vibration amplitude of the vacuum pump is large, the support plate 4 can move up and down to drive the two adjacent sliding rods 6 to move relatively, and when the two adjacent sliding rods 6 move inwards simultaneously, due to the arrangement of the one-way valve on the air suction pipe 7, air in the extrusion cylinder 5 can be extruded into the exhaust pipe 8, and air is blown into the protection box body 1 through the exhaust pipe 8, so that the heat dissipation of the vacuum pump can be assisted; on the contrary, when two adjacent slide bars 6 outwards move simultaneously, because the check valve setting on the blast pipe 8, when extrusion barrel 5 is inside to form negative pressure state gradually, inhale extrusion barrel 5 inside through breathing pipe 7 with gas, the work of supplementary vacuum pump reduces the consumption of partial energy.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims

1. The utility model provides a shock-proof type vacuum pump, includes protection box (1) and case lid (2), tip is equipped with guide holder (11) under protection box (1) inner chamber, guide holder (11) upper end activity is pegged graft and is had backup pad (4), its characterized in that: the left end part and the right end part of the supporting plate (4) are symmetrically provided with guide chutes (13), the front end surface of the supporting plate (4) is fixedly provided with an extrusion cylinder body (5), the front end part and the rear end part of the extrusion cylinder body (5) are respectively communicated with an air suction pipe (7) and an air exhaust pipe (8), sliding rods (6) are symmetrically inserted at the left end and the right end of the extrusion cylinder body (5), limiting rods (12) are fixedly inserted on the sliding rods (6), a second piston cylinder (16) and a first piston cylinder (10) are sequentially arranged on the left side and the right side of the inner cavity of the protective box body (1) from bottom to top, the second piston cylinder (16) is communicated with the first piston cylinder (10) through a first connecting pipe (14), the inner end part of the first piston cylinder (10) is hinged with an anti-seismic device (3), and the lower end part of the anti-seismic device (3) is connected with the adjusting device (9) through a second connecting pipe (15);

the anti-seismic device (3) comprises a shock absorption box (31), an upper cavity barrel (32) and a lower cavity barrel (33) which are respectively hinged with the upper end and the lower end of an inner cavity of the shock absorption box (31), the inner cavities of the upper cavity barrel (32) and the lower cavity barrel (33) are respectively movably connected with an upper pushing barrel (35) and a lower pushing barrel (34), the upper pushing barrel (35) is connected with the upper cavity barrel (32) through a fourth spring (39), the lower pushing barrel (34) is connected with the lower cavity barrel (33) through a third spring (38), an upper piston rod (36) and a lower piston rod (37) are respectively movably connected inside the upper pushing barrel (35) and the lower pushing barrel (34), the upper piston rod (36) and the lower piston rod (37) are fixedly installed on the plug-in barrel (300), a second sliding block (303) and a first sliding block (305) are respectively movably inserted into the inner side and the outer side of the plug-in barrel (300), and a first spring (305) is respectively arranged between the first sliding block (305) and the plug-in barrel (300) 302) And the first sliding block (305) is fixedly arranged on the shock absorption box (31), the inner end part of the shock absorption box (31) is movably inserted with a guide rod (306), the second sliding block (303) is movably sleeved on the guide rod (306), and the inner end part of the guide rod (306) is fixedly provided with a profile block (301).

Adjusting device (9) include oil tank (92), surge tank (31) are through second connecting pipe (15) and oil tank (92) intercommunication, oil tank (92) upper end activity is pegged graft and is had inserted bar (90), inserted bar (90) upper end activity has cup jointed balancing weight (91), oil tank (92) are located between adjacent surge tank (31).

2. A vacuum pump of the shock-absorbing type as claimed in claim 1, wherein the right end portion of said second piston cylinder (16) is fixedly installed with the slide bar (6).

3. A vacuum pump of the shock-absorbing type as claimed in claim 1, wherein check valves are provided on both the suction pipe (7) and the exhaust pipe (8).

4. A vacuum pump of the vibration damping type as claimed in claim 1, wherein the opposite ends of the upper chamber cylinder (32) and the lower chamber cylinder (33) are open, and the inner diameter of the upper chamber cylinder (32) is equal to the outer diameter of the upper push cylinder (35), and the inner diameter of the lower chamber cylinder (33) is equal to the outer diameter of the lower push cylinder (34).

5. A vacuum pump of the vibration-damped type as claimed in claim 1, wherein said first sliding block (305) and said second sliding block (303) are each shaped like a "T".

6. A vacuum pump of the shock-absorbing type as claimed in claim 1, wherein the limiting rod (12) is movably connected in the groove of the guide chute (13), and the outer diameter of the limiting rod (12) is equal to the groove width of the guide chute (13).

7. A vacuum pump of the shock-absorbing type as claimed in claim 1, wherein said first piston cylinder (10), second piston cylinder (16) and squeeze cylinder (5) are all in communication.

8. A vacuum pump of the shock-absorbing type as claimed in claim 1, wherein said protective casing (1) is provided with a support plate (17) for mounting said second piston cylinder (16), and the upper end surface of said support plate (17) is in sliding contact with the lower end surface of said slide rod (6).

9. A vacuum pump of the shock-absorbing type as claimed in claim 1, wherein said upper piston rod (36) and lower piston rod (37) are engaged with the upper push cylinder (35) and lower push cylinder (34) in a T-shape, respectively.