CN100406731C - Anti-seize vacuum pump - Google Patents

Abstract

The present invention relates to a blockage preventing vacuum pump which mainly comprises an upper housing, a middle seat, a non-return rubber sheet clamped between the middle seat and the upper housing, a base and an elastic membrance, wherein the elastic membrance is clamped between the middle seat and the base. The present invention is mainly characterized in that a clearance structure is arranged between the middle seat and the elastic membrance and is connected with an air sucking hole and an air discharging hole which are arranged on the middle seat. The present invention aims to achieve the purpose that when moving upwards to the highest position, the elastic membrance can not be completely attached to the lower part of the middle seat to cause blockage.

Description

Anti-seize vacuum pump

technical field

The invention relates to a vacuum pump, in particular to a vacuum pump which is structurally improved and can prevent jamming.

Background technique

Vacuum pumps are widely used in various fields that need to evacuate confined spaces, and are mainly used to evacuate confined spaces. The structure and principle of the vacuum pump are as follows: an elastic diaphragm is interposed between an upper casing and a partition, and an air chamber is formed between the elastic diaphragm and the upper casing; The suction hole and exhaust hole connected to the outside of the air chamber are unidirectional and opposite in direction; the bottom of the elastic diaphragm is connected to the output shaft of a motor through a connecting shaft and an eccentric wheel , When the motor is working, the eccentric wheel drives the elastic diaphragm to move up and down, so that the air chamber sucks air from the suction hole and exhausts it from the exhaust hole. The suction air communicates with the closed space that needs to be vacuumed, and the exhaust hole communicates with the outside atmosphere, so that the gas in the closed space can be drawn out through the air chamber.

During the above-mentioned vacuuming process, when the air chamber is exhausted once, the elastic diaphragm moves to the top of the air chamber. When the air pressure under the elastic diaphragm is greater than the air pressure in the closed space, the elastic diaphragm is completely sucked and attached tightly. Below the upper casing, if the power is cut off at this time, the motor may not be able to drive the elastic diaphragm to move downward, that is, the vacuum pump is stuck and cannot work normally.

Contents of the invention

The invention provides a vacuum pump capable of preventing jamming, the main purpose of which is to overcome the defect that the existing vacuum pump is prone to jamming during the vacuuming process and affects its normal operation.

Technical solution 1 of the present invention: a vacuum pump that can prevent jamming, including: an upper casing, which is provided with a suction port and an exhaust port communicating with the outside, an annular groove is recessed around the inner side of the suction port, and the inner side of the exhaust port One side of the edge is provided with a groove; a middle seat is embedded under the upper casing, the middle seat is provided with suction holes and exhaust holes corresponding to the suction port and the exhaust port, and the bottom of the middle seat is provided with There is a groove connecting the suction hole and the lower edge of the exhaust hole, a groove is formed on the side above the edge of the suction hole, and an annular groove is recessed around the top of the exhaust hole; a non-return rubber sheet is sandwiched between Between the middle seat and the upper casing, the check rubber sheet is respectively provided with a first check valve sheet, a second check valve sheet, and a first check valve sheet along the periphery corresponding to the suction hole and the exhaust hole. Bias to the side of the upper housing, the second check valve plate is biased to the side of the middle seat; a base and an elastic diaphragm, the base is connected to the bottom of the upper housing, and the elastic diaphragm is sandwiched between the base and the middle Between the seats, an air chamber is formed between the elastic diaphragm and the middle seat, and a connecting rod protruding below the base is formed under the elastic diaphragm, and the connecting rod is connected with an eccentric wheel through a linkage shaft, and the eccentric The center of the wheel is connected to the output shaft of a motor.

In the anti-seize vacuum pump mentioned above, the two sides of the non-return rubber sheet are protrudingly provided with sealing lines around the two non-return valve sheets, so as to prevent gas from leaking to the surroundings.

The anti-jamming vacuum pump described above further includes: a motor casing connected to a lower position on one side of the base, and the motor is installed in the motor casing; a lower casing is connected to the bottom of the base, and the The connecting rod, the linkage shaft and the eccentric wheel under the elastic diaphragm are enclosed therein, and the lower casing plays the role of dustproof and reducing the noise generated during the operation of the vacuum pump.

The aforementioned anti-jamming vacuum pump, wherein the bottom periphery of the upper casing is provided with a number of positioning rods extending downward, the bottom end of the positioning rods is provided with threaded holes, and the edge of the base is provided with through holes for the positioning rods to pass through. , the periphery of the upper end of the lower shell is provided with a cylindrical groove for the end of each positioning rod to be embedded, and each cylindrical groove is connected with a screw hole communicating with the lower surface of the lower shell, and a screw is fitted in each screw hole, and each screw is respectively screw into the threaded holes at the bottom ends of each positioning rod, so that the upper shell, the base and the lower shell are fixedly connected as a whole.

The aforementioned anti-seize vacuum pump, wherein, the inner surface of the upper casing extends downwards around the non-return rubber sheet to form a positioning frame, and the positioning frame is provided with positioning protrusions protruding into the positioning frame. The back rubber sheet is embedded in the positioning frame, and its peripheral edge is provided with a positioning concave part matched with the aforementioned positioning convex point.

The aforementioned anti-jamming vacuum pump, wherein, the bottom surface of the middle seat is depressed upwards, and a conical surface with a small top and a large bottom is formed around the suction hole and the exhaust hole, and the middle part of the elastic diaphragm is raised upwards, A shape suitable for the tapered surface is formed, and longitudinal convex ribs are distributed on the tapered surface.

The second technical solution of the present invention: a vacuum pump that can prevent jamming, including: an upper casing, which is provided with an air suction port and an exhaust port communicating with the outside, an annular groove is recessed around the inner side of the air suction port, and the inner side of the exhaust port One side of the edge is provided with a groove; a middle seat is embedded under the upper casing, the middle seat is provided with suction holes and exhaust holes corresponding to the suction port and the exhaust port, and the bottom of the middle seat is provided with There is a convex rib connecting the suction hole and the lower edge of the exhaust hole, a groove is formed on the side above the edge of the suction hole, and an annular groove is recessed around the top of the exhaust hole; a non-return rubber sheet is sandwiched between Between the middle seat and the upper casing, the check rubber sheet is respectively provided with a first check valve sheet, a second check valve sheet, and a first check valve sheet along the periphery corresponding to the suction hole and the exhaust hole. Bias to the side of the upper housing, the second check valve plate is biased to the side of the middle seat; a base and an elastic diaphragm, the base is connected to the bottom of the upper housing, and the elastic diaphragm is sandwiched between the base and the middle Between the seats, an air chamber is formed between the elastic diaphragm and the middle seat, and a connecting rod protruding below the base is formed under the elastic diaphragm, and the connecting rod is connected with an eccentric wheel through a linkage shaft, and the eccentric The center of the wheel is connected to the output shaft of a motor.

The main difference between technical solution 2 and technical solution 1 is that technical solution 2 is provided with a convex rib connecting the suction hole and the lower edge of the exhaust hole under the middle seat, while technical solution 1 is provided with a connecting suction hole under the middle seat Although the structure of the groove on the lower edge of the exhaust hole is different, its principle and purpose are the same, that is, when the elastic diaphragm moves up to the highest position, it will not completely fit under the middle seat and cause it to be stuck. .

The main difference between the third technical solution of the present invention and the first technical solution is that the groove connecting the lower edge of the suction hole and the lower edge of the exhaust hole under the middle seat of the technical solution one is changed to: There is a groove on the surface connecting the suction hole and the exhaust hole on the middle seat. The purpose is still to prevent the elastic diaphragm from fully fitting under the middle seat and causing it to be stuck when it moves upwards to the highest position. .

The fourth technical solution of the present invention differs from the first technical solution in that: the groove connecting the suction hole and the lower edge of the exhaust hole under the middle seat of the technical solution one is changed to: There is a convex rib connecting the suction hole and the exhaust hole on the middle seat, the purpose of which is still to prevent the elastic diaphragm from completely fitting under the middle seat and causing jamming when the elastic diaphragm moves upwards to the highest position. .

Although the above four technical solutions have different structures, their overall concept is the same, that is, a spacer is provided between the middle seat and the elastic diaphragm, so that when the elastic diaphragm moves upward to the highest position, it will not be completely attached to the middle. The phenomenon of jamming occurs under the seat.

As can be seen from the above description of the structure of the present invention, the present invention has the following advantages: 1. The present invention overcomes the difficult problem that the vacuum pump is easily stuck by simple and creative structural improvements. When its elastic diaphragm moves upwards to the highest position, it will not It is completely attached to the bottom of the middle seat to make it stuck, so it is more convenient to use and does not need to be repaired because of the stuck; second, the present invention has a compact structure and is firm and durable.

Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of Embodiment 1 of the present invention;

Fig. 2 is a three-dimensional exploded view of Embodiment 1 of the present invention;

Fig. 3 is a three-dimensional exploded view from another angle of Embodiment 1 of the present invention;

Fig. 4 is a three-dimensional structural schematic diagram of an intermediate seat according to an embodiment of the present invention;

Fig. 5 is a three-dimensional structural schematic diagram of another angle of an intermediate seat according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of a three-dimensional structure of an upper casing according to Embodiment 1 of the present invention;

7 is a schematic diagram of the three-dimensional structure of a non-return rubber sheet according to an embodiment of the present invention;

Fig. 8 is a three-dimensional structural schematic diagram of another angle of a non-return rubber sheet according to the embodiment of the present invention;

Fig. 9 is a schematic diagram of the three-dimensional structure of the middle seat of the second embodiment of the present invention;

Fig. 10 is a schematic diagram of the three-dimensional structure of the elastic diaphragm of the third embodiment of the present invention;

Fig. 11 is a schematic diagram of the three-dimensional structure of the elastic diaphragm of Embodiment 4 of the present invention.

specific embodiment

Specific embodiment one of the present invention, referring to Fig. 1 to Fig. 8, the anti-jamming vacuum pump includes an upper casing 1, a non-return rubber sheet 2, a middle seat 3, an elastic diaphragm 4, a base 5, and a lower casing body 6 and motor 7.

The upper casing 1 is provided with an air intake port 101 and an exhaust port 102 communicating with the outside. Referring to Fig. 6, an annular groove 103 is recessed around the inner side of the suction port 101, and a groove 104 is provided on one side of the inner edge of the exhaust port 102;

The middle seat 3 is embedded under the upper casing 1. Referring to Fig. 4 and Fig. 5, the middle seat 3 is provided with a suction hole 301 and an exhaust hole 302 respectively corresponding to the suction port 101 and the exhaust port 102. There is a groove 303 connecting the lower edge of the suction hole 301 and the exhaust hole 302 below the seat 3, a groove 3010 is provided on the side above the edge of the suction hole 301, and an annular groove is recessed around the top of the exhaust hole 302. 304;

The non-return rubber sheet 2 is sandwiched between the middle seat 3 and the upper casing 1. Referring to Fig. 6, Fig. 7 and Fig. 8, the inner surface of the upper casing 1 extends downward around the non-return rubber sheet 2 to form a positioning frame 11 The positioning frame 11 is provided with a positioning convex point 111 protruding into the positioning frame 11, the non-return rubber sheet 2 is embedded in the positioning frame 11, and a positioning concave portion 205 is provided on its periphery to cooperate with the aforementioned positioning convex point 111, The check rubber sheet 2 is respectively provided with a first check valve sheet 201 and a second check valve sheet 202 along positions corresponding to the suction hole 301 and the exhaust hole 302, and the first check valve sheet 201 is biased toward the upper casing. 1 side, the second check valve plate 202 is biased towards the middle seat 3 side;

The base 5 is connected to the bottom of the upper casing 1, and the elastic diaphragm 4 is sandwiched between the base 5 and the middle seat 3, an air chamber is formed between the elastic diaphragm 4 and the middle seat 3, and the elastic diaphragm 4 is A connecting rod 40 protruding below the base 5 is formed, the connecting rod 40 is connected with an eccentric wheel 8 through a bearing 42 and a connecting shaft 43, and the center of the eccentric wheel 8 is connected with the output shaft 71 of a motor 7 , the motor 7 is covered with a motor casing 70, and the motor casing 70 is connected to the lower position on one side of the base 5;

With reference to Fig. 4, the bottom surface of the middle seat 3 is upwardly recessed, and a conical surface 30 with a small upper part and a larger lower part is formed around its suction hole 301 and exhaust hole 320. 30, the tapered surface 30 is evenly distributed with longitudinal convex ribs 32;

The lower casing 6 is connected to the bottom of the base 5 and encloses the connecting rod 40 below the elastic diaphragm 4 , the linkage shaft 43 and the eccentric wheel 8 therein.

With reference to Fig. 2, Fig. 3, upper casing 1 bottom peripheral edge is provided with a plurality of positioning rods 12 extending downwards, and the bottom end of positioning rods 12 is provided with threaded hole 121, and the edge position of base 5 is provided with for each positioning rod 12 to pass through. Through hole 52, the periphery of the upper end of lower housing 6 is provided with a cylindrical groove 62 for embedding the ends of each positioning rod 12, and each cylindrical groove 62 is connected with a screw hole 620 communicating with the lower surface of lower housing 6, and each screw A screw 621 is matched in the hole 620, and each screw 621 is respectively screwed into the threaded hole 121 at the bottom of each positioning rod 12, so that the upper casing 1, the base 5, and the lower casing 6 are fixedly connected as one.

The upper casing 1, the non-return rubber sheet 2, and the middle seat 3 form the effect of one-way flow of gas at the suction port 101 and the exhaust port 102, that is, when the motor 7 drives the middle part of the elastic diaphragm 4 to move up and down through the eccentric wheel 8 At this time, the gas can only enter the air chamber from the suction port 101, and can only be discharged from the exhaust port 102; the groove 303 connecting the suction hole 301 and the lower edge of the exhaust hole 302 under the middle seat 3 makes the elastic membrane When the sheet 4 moves upwards to the highest position, it will not be completely attached to the bottom of the upper casing 1 and cause it to be stuck.

The specific embodiment 2 of the present invention, with reference to Fig. 9, is its middle seat structure, and the main difference with embodiment 1 is: the groove 303 is connected to the lower edge of the suction hole 301 and the exhaust hole 302 in the implementation of the first embodiment, and In the second embodiment, the rib 305 connects the lower edge of the suction hole 301 and the exhaust hole 302, and its purpose is the same, both are to make the elastic diaphragm 4 move upwards to the highest position, so that it will not be completely attached to the upper shell The bottom of the body 1 makes it stuck. The groove 303 and the convex rib 305 are important anti-seize structures of the present invention, but they are not limited thereto, and they can be changed into other equivalent structures such as bumps.

The third technical solution of the present invention, referring to Fig. 10 , is a schematic diagram of the three-dimensional structure of the elastic diaphragm 4, and the main difference from the first technical solution is that the air suction hole 301 and the exhaust hole 302 are connected under the middle seat 3 of the technical solution one. The groove 303 on the lower side edge is changed into the groove that is located at the opposite face of the elastic diaphragm 4 and the middle seat 3, and this groove is also used to connect the suction hole 301 and the exhaust hole 302 on the middle seat 3, and its purpose Still, when the elastic diaphragm 4 moves upwards to the highest position, it will not completely fit under the middle seat 3 and be stuck.

The fourth technical solution of the present invention, referring to Fig. 11 , is a schematic diagram of the three-dimensional structure of the elastic diaphragm 4, and the main difference from the first technical solution is that the suction hole 301 and the exhaust hole 302 are connected under the middle seat 3 of the technical solution one. The groove 303 on the lower side edge is changed into a raised rib on the surface opposite to the elastic diaphragm 4 and the middle seat 3, and the raised rib is also used to connect the air suction hole 301 and the exhaust hole 302 on the middle seat 3, which The purpose is still to prevent the elastic diaphragm 4 from being stuck under the middle seat 3 completely when it moves upwards to the highest position. The aforementioned grooves 303 and convex ribs 305 are important structures for anti-seizing of the vacuum pump of the present invention, but they are not limited thereto, and their specific shapes can have various changes, such as straight lines, curved lines, etc., and can also be changed to convex Dots and other equivalent structures.

The above are only a few specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial changes made to the present invention by using this concept should be an act of violating the protection scope of the present invention.

Claims (9)

1. Anti-jamming vacuum pump, including: An upper shell is provided with a suction port and an exhaust port communicating with the outside, an annular groove is recessed around the inner side of the suction port, and a groove is provided on one side of the inner edge of the exhaust port; A middle seat, embedded under the upper shell, the middle seat is provided with suction holes and exhaust holes corresponding to the suction port and the exhaust port, and a connecting suction hole and exhaust hole are provided under the middle seat The groove on the lower side edge, a groove is formed on the side above the edge of the suction hole, and an annular groove is concavely formed around the top of the exhaust hole; A non-return rubber sheet is sandwiched between the middle seat and the upper casing. The non-return rubber sheet is respectively provided with a first non-return valve sheet and a second non-return valve sheet along the positions corresponding to the suction hole and the exhaust hole. Valve slices, the first check valve slice is biased to the side of the upper shell, and the second check valve slice is biased to the side of the middle seat; A base and an elastic diaphragm, the base is connected under the upper casing, the elastic diaphragm is sandwiched between the base and the middle seat, an air chamber is formed between the elastic diaphragm and the middle seat, the elastic A connecting rod protruding below the base is formed under the diaphragm, and the connecting rod is connected with an eccentric wheel through a linkage shaft, and the center of the eccentric wheel is connected with an output shaft of a motor. 2. The anti-jamming vacuum pump as claimed in claim 1, wherein the two sides of the check rubber sheet are protrudingly provided with sealing lines surrounding the two check valve sheets. 3. The anti-seize vacuum pump of claim 1, further comprising: A motor casing, connected to the lower position on one side of the base, and the motor is installed in the motor casing; The bottom casing is connected to the bottom of the base, and the connecting rod, the linkage shaft and the eccentric wheel under the elastic diaphragm are enclosed therein. 4. The anti-jamming vacuum pump as claimed in claim 3, wherein the bottom periphery of the upper housing is provided with a plurality of positioning rods extending downward, the bottom end of the positioning rods is provided with threaded holes, and the edge of the base is provided with holes for each The through hole through which the positioning rod passes, the upper end periphery of the lower housing is provided with a cylindrical groove for the end of each positioning rod to be embedded, and each cylindrical groove is connected with a screw hole communicating with the lower surface of the lower housing. Cooperate with a screw, and each screw is respectively screwed into the threaded hole at the bottom end of each positioning rod, so as to fix and connect the upper shell, the base and the lower shell as a whole. 5. The anti-jamming vacuum pump according to claim 1, wherein, the inner surface of the upper casing extends downwards around the non-return rubber sheet to form a positioning frame, and the positioning frame is provided with a protrusion protruding into the positioning frame. The positioning convex point, the non-return rubber sheet is embedded in the positioning frame, and a positioning concave part matching with the aforementioned positioning convex point is provided on its periphery. 6. The anti-jamming vacuum pump according to claim 1, wherein, the bottom surface of the intermediate seat is sunken upwards, forming a conical surface with a small top and a large bottom around the air suction hole and the exhaust hole, and the elastic diaphragm The upper part of the middle portion protrudes upwards to form a shape suitable for the tapered surface, and longitudinal convex ribs are distributed on the tapered surface. 7. Anti-jamming vacuum pump, including: An upper shell is provided with a suction port and an exhaust port communicating with the outside, an annular groove is recessed around the inner side of the suction port, and a groove is provided on one side of the inner edge of the exhaust port; A middle seat, embedded under the upper shell, the middle seat is provided with suction holes and exhaust holes corresponding to the suction port and the exhaust port, and a connecting suction hole and exhaust hole are provided under the middle seat Convex ribs on the lower edge, a groove on the side above the edge of the suction hole, and an annular groove around the top of the exhaust hole; A non-return rubber sheet is sandwiched between the middle seat and the upper casing. The non-return rubber sheet is respectively provided with a first non-return valve sheet and a second non-return valve sheet along the positions corresponding to the suction hole and the exhaust hole. Valve slices, the first check valve slice is biased to the side of the upper shell, and the second check valve slice is biased to the side of the middle seat; A base and an elastic diaphragm, the base is connected under the upper casing, the elastic diaphragm is sandwiched between the base and the middle seat, an air chamber is formed between the elastic diaphragm and the middle seat, the elastic A connecting rod protruding below the base is formed under the diaphragm, and the connecting rod is connected with an eccentric wheel through a linkage shaft, and the center of the eccentric wheel is connected with an output shaft of a motor. 8. Anti-jamming vacuum pump, including: An upper shell is provided with a suction port and an exhaust port communicating with the outside, an annular groove is recessed around the inner side of the suction port, and a groove is provided on one side of the inner edge of the exhaust port; An intermediate seat is embedded under the upper shell, and the intermediate seat is provided with suction holes and exhaust holes corresponding to the suction port and the exhaust port, and a groove is provided on the side above the edge of the suction hole. An annular groove is recessed around the top of the exhaust hole; A non-return rubber sheet is sandwiched between the middle seat and the upper casing. The non-return rubber sheet is respectively provided with a first non-return valve sheet and a second non-return valve sheet along the positions corresponding to the suction hole and the exhaust hole. Valve slices, the first check valve slice is biased to the side of the upper shell, and the second check valve slice is biased to the side of the middle seat; A base and an elastic diaphragm, the base is connected under the upper casing, the elastic diaphragm is sandwiched between the base and the middle seat, an air chamber is formed between the elastic diaphragm and the middle seat, the elastic The surface of the diaphragm opposite to the middle seat is provided with a groove connecting the suction hole and the exhaust hole on the middle seat, and a connecting rod protruding from the bottom of the base is formed under the elastic diaphragm, and the connecting rod passes through a linkage The shaft is connected to an eccentric whose center is connected to the output shaft of a motor. 9. Anti-jamming vacuum pump, including: An upper shell is provided with a suction port and an exhaust port communicating with the outside, an annular groove is recessed around the inner side of the suction port, and a groove is provided on one side of the inner edge of the exhaust port; An intermediate seat is embedded under the upper shell, and the intermediate seat is provided with suction holes and exhaust holes corresponding to the suction port and the exhaust port, and a groove is provided on the side above the edge of the suction hole. An annular groove is recessed around the top of the exhaust hole; A non-return rubber sheet is sandwiched between the middle seat and the upper casing. The non-return rubber sheet is respectively provided with a first non-return valve sheet and a second non-return valve sheet along the positions corresponding to the suction hole and the exhaust hole. Valve slices, the first check valve slice is biased to the side of the upper shell, and the second check valve slice is biased to the side of the middle seat; A base and an elastic diaphragm, the base is connected under the upper casing, the elastic diaphragm is sandwiched between the base and the middle seat, an air chamber is formed between the elastic diaphragm and the middle seat, the elastic The surface of the diaphragm opposite to the middle seat is provided with a convex rib connecting the suction hole and the exhaust hole on the middle seat, and a connecting rod protruding from the bottom of the base is formed under the elastic diaphragm, and the connecting rod is passed through a linkage The shaft is connected to an eccentric whose center is connected to the output shaft of a motor.

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