CN211874676U - Double-bearing sliding balance guide device totally enclosed type miniature plunger pump - Google Patents

Abstract

The utility model provides a duplex bearing sliding balance guider totally enclosed's miniature plunger pump, it includes volume cavity pump head (1), plunger stick core (2), general stopper seals (3), the pump body (4), bearing external member apron (5), bearing (6), plunger main part (7), bearing pin (8), drive nut (9), screw rod (10), gasket (11), sensor response round pin (12), photoelectric sensor (13), dust cover (14), nut locating pin (15), step motor (16), connecting plate (17). The utility model discloses the opposite face on transmission plunger main part has respectively increased one set of bearing spare and has been done the stability when rolling direction and balanced core part transmission, has increased a locating pin assembly simultaneously and has prevented the not hard up that the long-time work of product brought in being connected core part plunger main part and core transmission part's nut, makes the product can keep more permanent stability ability and increase the life of product again when promoting the precision like this.

Description

Double-bearing sliding balance guide device totally enclosed type miniature plunger pump

Technical Field

The utility model relates to a precision instruments field especially relates to a cavity volume is plunger pump within 25000ul (microliter).

Background

The miniature plunger pump is one kind of small flow and micro flow high precision control pump. The micro plunger pump is a plunger pump with the maximum cavity volume within 25000ul (microliter). The screw is driven by a stepping motor and is driven by a screw and a nut. The plunger rod core reciprocates in the plunger sealed cavity to change the volume of the sealed working cavity so as to realize liquid suction and discharge. The micro plunger pump has the advantages of imbibition, liquid discharge, compact structure, convenient micro-flow adjustment and the like, and is widely applied to the application occasions where the imbibition, liquid discharge and flow of small flow and micro-flow need high-precision control, such as inspection equipment and laboratory detection instruments in the medical field.

The common transmission mode of the micro plunger pump is that a screw and a nut are used as the transmission mode, and as no other effective linear guide device is arranged in the transmission between the screw and the nut in the prior art, the transmission between the screw and the nut is unstable, so that the precision of the micro plunger pump during liquid suction and liquid discharge is poor, and the service life performance of the micro plunger pump is greatly reduced.

As shown in fig. 1 to 3, the names of the components in the drawings are as follows: the micro plunger pump comprises a pump body 100, a plunger main body 200, a screw 300 and a stepping motor 400, wherein the plunger main body 200 and the screw 300 are in transmission, and no precise linear guide device is arranged, so that the amplitude of non-directional swing is large when the plunger main body 200 is in transmission, and the liquid suction and discharge precision and the service life of the micro plunger pump are poor.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a totally enclosed type miniature plunger pump of a double-bearing sliding balance guiding device, which comprises a volume cavity pump head, a plunger rod core, a universal plug seal, a pump body, a bearing sleeve cover plate, a needle bearing, a plunger main body, a bearing pin, a transmission nut, a screw rod, a gasket, a sensor induction pin, a photoelectric sensor, a dustproof cover plate, a stepping motor and a connecting plate;

the connection relationship is as follows: based on the pump body, a pump head of a volume cavity is arranged in front of the pump body, a stepping motor is arranged behind the pump body, a photoelectric sensor is arranged above the pump head, and a connecting plate is arranged below the pump head; the dustproof cover plate is arranged above the pump body;

the flooding plug seal is arranged in a hole in the back of the pump head of the volume cavity; the plunger rod core is assembled in a central hole of the plunger main body, and the sensor induction pin is fixed in a hole above the plunger main body;

the gasket and the hole site of the drive nut are all connected to the plunger body in alignment, and the central hole, the pin hole and the bolt hole of the gasket, the pin hole and the bolt hole are precisely assembled, installed and connected;

the plunger rod core and the plunger main body are arranged in the pump body, and the plunger rod core penetrates through the pump body and the flooding plug seal to enter the pump head of the volume cavity;

the bearing pin penetrates into the interference fit holes in the two sides of the plunger main body from the clearance fit holes in the two sides of the pump body, the needle roller bearing penetrates through the bearing pin, the needle roller bearing and the bearing pin are matched to form a bearing kit, the cover plate of the bearing kit is used for covering the bearing kits on the two sides of the pump body, and the bearing kits are in infinite rolling circulation in the clearance fit holes in the two sides of the pump body.

As a further improvement, the utility model also comprises a nut positioning pin, the nut positioning pin is assembled in the interference fit hole corresponding to the transmission nut in the side of the plunger main body.

As a further improvement of the utility model, the needle bearing is replaced by a roller bearing, a deep groove ball bearing, a miniature sleeve, a punching needle bearing, a needle bearing with an inner ring, a needle bearing with an outer ring, a bolt roller bearing, a cam follower or an one-way needle bearing.

As a further improvement of the present invention, the needle roller bearing is a bearing having a nominal outer diameter of 26mm or less.

The utility model has the advantages that:

the utility model discloses a miniature plunger pump increases the bearing spare and does the roll direction, stability during the transmission of balanced core part, it prevents the not hard up that long-time work of product brought to have increased a locating pin assembly in being connected with core transmission part's nut to core part plunger main part simultaneously, compare after the improvement technique on the product of prior art precision has promoted about 10% -20%, linear data picture when the product transmission has promoted about 10% -15%, the life of product has promoted about 20% -30%, the effectual life who has promoted stability when the product uses and product.

Drawings

FIG. 1: a perspective view of a prior art micro plunger pump;

FIG. 2: the micro plunger pump in the prior art is cut away and is in perspective view;

FIG. 3: prior art micro plunger pump cross-sectional views;

FIG. 4: the utility model is a three-dimensional view;

FIG. 5: the utility model discloses a front view;

FIG. 6: FIG. 5 is a perspective sectional view taken at G-G;

FIG. 7: FIG. 5 is a sectional view taken along line G-G;

FIG. 8: FIG. 5 is a perspective sectional view taken at F-F;

FIG. 9: FIG. 5 is a sectional view taken along line F-F;

FIG. 10 is an exploded view of a bearing component according to the present invention;

FIG. 11 is a perspective view of a bearing component of the present invention;

FIG. 12: the utility model discloses an explosion diagram;

FIG. 13: the utility model has partial view and partial section;

FIG. 14: the utility model discloses a partial view;

FIG. 15: the explosion diagram of figure 14 of the present utility model.

The names of the components in the figure are as follows:

the device comprises a volume cavity pump head 1, a plunger rod core 2, a universal plug seal 3, a pump body 4, a bearing sleeve cover plate 5, a needle bearing 6, a plunger main body 7, a bearing pin 8, a transmission nut 9, a screw rod 10, a gasket 11, a sensor induction pin 12, a photoelectric sensor 13, a dustproof cover plate 14, a nut positioning pin 15, a stepping motor 16 and a connecting plate 17.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

A totally enclosed micro plunger pump with a double-bearing sliding balance guide device comprises a volume cavity pump head 1, a plunger rod core 2, a universal plug seal 3, a pump body 4, a bearing sleeve cover plate 5, a micro roller needle bearing 6, a plunger main body 7, a bearing pin 8, a transmission nut 9, a screw rod 10, a gasket 11, a sensor induction pin 12, a photoelectric sensor 13, a dustproof cover plate 14, a nut positioning pin 15, a stepping motor 16 and a connecting plate 17.

The assembly relation is as shown in fig. 6 to 14, the pump body 4 is taken as a base, the front part is provided with the volume cavity pump head 1, the back part is provided with the stepping motor 16, the photoelectric sensor 13 is arranged on the pump head, and the lower part is provided with the connecting plate 17.

The plunger rod core 2 is assembled in the central hole of the plunger main body 7, and the sensor induction pin 12 is fixed in the hole above the plunger main body 7. The nut positioning pin 15 is assembled in a fine hole corresponding to the transmission nut 9 on the side of the plunger main body 7, the gasket 11 and the hole site of the transmission nut 9 are all connected to the plunger main body 7 in an aligned mode, and the central hole, the pin hole and the bolt hole of the three are precisely assembled, installed and connected. The screw rod 10 is arranged on a rotating shaft of the stepping motor 16, the transmission nut 9 is rotationally connected with the screw rod 10, the plunger rod core 2 and the plunger main body 7 are arranged in the pump body 4, the plunger rod core 2 penetrates through the pump body 4 and the flooding plug seal 3 to enter the volume cavity pump head 1, and the stepping motor 16 is connected with the rear side of the pump body 4. Bearing pins 8 penetrate into the fine holes on the two sides of the plunger main body 7 from the fine long holes on the two sides of the pump body 4, needle bearings 6 penetrate through the bearing pins 8, the bearing sleeve cover plate 5 is used for covering bearing sleeves on the two sides of the pump body 4, and the bearing sleeves roll in the fine long holes on the two sides of the pump body 4 in an infinite loop mode. Description of the drawings: in the specific embodiment, the needle bearing 6 rotates along with the bearing pin 8, and the needle bearing 6 is infinitely circulated in the fine long holes on the two side surfaces of the pump body (4) in a rolling mode.

The needle bearing 6 acts as: the support and guide moving part does reciprocating linear motion in a given direction, and can be understood as rolling guide, and the micro roller needle bearing 6 is in infinite rolling circulation on the bearing pin 8 and in the fine long holes on the two sides of the pump body (4), so that the load platform can easily and linearly and stably reciprocate in the fine long holes on the two sides of the pump body (4).

Description of the drawings: the needle bearing (6) refers to a bearing with a nominal outer diameter of less than 26 mm;

the utility model discloses it does to prefer bearing does the utility model discloses an implementation method the utility model discloses other similar types of bearing of selection, for example: the device comprises a roller bearing, a deep groove ball bearing, a shaft sleeve, a stamping needle bearing, an inner ring needle bearing, an outer ring needle bearing, a bolt roller bearing, a cam follower, a one-way needle bearing and the like.

Precision hole in this application refers to an interference fit hole. The fine hole refers to a clearance fit hole.

And (4) clearance fit. The tolerance band of the bore is above the tolerance band of the shaft with a fit of clearance (including a minimum clearance equal to zero). The clearance has the functions of storing lubricating oil, compensating various errors and the like, and the size of the clearance influences the relative motion degree of the hole and the shaft. The clearance fit is mainly used for the movable connection between the hole and the shaft, such as the connection between a sliding bearing and the shaft.

And (4) interference fit. The tolerance band of the bore is below the tolerance band of the shaft with an interference (including a minimum interference equal to zero) fit. In the interference fit, since the shaft is larger than the hole, it is necessary to assemble the shaft by pressing, expansion with heat, contraction with cold, or the like. The interference fit is mainly used for fastening connection of hole shafts without allowing relative movement, such as connection of a gear ring of a large gear and a hub.

And (5) transition fit. The tolerance bands of the bore and shaft overlap and may have a clearance fit or an interference fit (which is typically small). The transition fit is mainly used for positioning connection which requires good centering property and coaxiality between hole shafts and is easy to disassemble and assemble, such as connection of the inner diameter of a rolling bearing and a shaft.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (4)

1. The utility model provides a miniature plunger pump of duplex bearing sliding balance guider totally enclosed which characterized in that: the plunger pump comprises a volume cavity pump head (1), a plunger rod core (2), a universal plug seal (3), a pump body (4), a bearing sleeve cover plate (5), a needle bearing (6), a plunger main body (7), a bearing pin (8), a transmission nut (9), a screw (10), a gasket (11), a sensor induction pin (12), a photoelectric sensor (13), a dustproof cover plate (14), a stepping motor (16) and a connecting plate (17); the connection relationship is as follows: based on the pump body (4), a volume cavity pump head (1) is arranged at the front, a stepping motor (16) is arranged at the rear, a photoelectric sensor (13) is arranged on the pump head, and a connecting plate (17) is arranged below the pump head;

the dustproof cover plate (14) is arranged above the pump body (4);

the flooding plug seal (3) is arranged in a hole in the back of the pump head (1) of the volume cavity; the plunger rod core (2) is assembled in a central hole of the plunger main body (7), and the sensor induction pin (12) is fixed in a hole above the plunger main body (7);

the gasket (11) and the hole site of the drive nut (9) are all connected to the plunger main body (7) in an aligned manner, and the central holes, the pin holes and the bolt holes of the gasket, the drive nut and the plunger main body are precisely assembled, installed and connected;

the screw rod (10) is arranged on a rotating shaft of the stepping motor (16), the transmission nut (9) is rotationally connected with the screw rod (10), the plunger rod core (2) and the plunger main body (7) are arranged in the pump body (4), and the plunger rod core (2) penetrates through the pump body (4) and the flooding plug seal (3) to enter the volume cavity pump head (1);

bearing pins (8) penetrate into interference fit holes formed in two sides of a plunger main body (7) from clearance fit holes in two sides of a pump body (4), needle bearings (6) penetrate through the bearing pins (8), the needle bearings (6) and the bearing pins (8) are matched to form a bearing kit, a bearing kit cover plate (5) is used for covering the bearing kits on the two sides of the pump body (4), and the bearing kits are in infinite rolling circulation in the clearance fit holes in the two sides of the pump body (4).

2. A double bearing sliding balanced guide totally enclosed micro-plunger pump according to claim 1, characterized by: the plunger piston is characterized by further comprising a nut positioning pin (15), wherein the nut positioning pin (15) is assembled in an interference fit hole corresponding to the transmission nut (9) in the side of the plunger piston main body (7).

3. A double bearing sliding balanced guide totally enclosed micro-plunger pump according to claim 1, characterized by: the needle roller bearing (6) is replaced by a roller bearing, a deep groove ball bearing, a miniature sleeve, a stamping needle roller bearing, an inner ring needle roller bearing, an outer ring needle roller bearing, a bolt roller bearing, a cam follower or a one-way needle roller bearing.

4. A double bearing sliding balanced guide totally enclosed micro-plunger pump according to claim 1, characterized by: the needle roller bearing (6) refers to a bearing with a nominal outer diameter size of less than 26 mm.

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