CN210564940U

CN210564940U - Metering pump piston rod driving device

Info

Publication number: CN210564940U
Application number: CN201921513079.2U
Authority: CN
Inventors: 陈英米; 罗祥耀
Original assignee: Taizhou Zhitong Technology Co ltd
Current assignee: Taizhou Zhitong Technology Co ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-05-19
Anticipated expiration: 2029-09-11

Abstract

The utility model relates to a metering pump piston rod driving device, including fixed box, box one end is equipped with the end flange, be equipped with slide bearing in the end flange, the other end is not sealed, and the terminal surface is connected with the output end flange admittedly, be equipped with the piston rod between slide bearing and the output end flange, the piston rod middle part is annular slider, the annular slider inboard is equipped with two racks of relative setting along length direction, annular slider both ends are equipped with cylindrical pole, and the cylindrical pole with the output end flange complex is the output end piston rod, and the cylindrical pole with slide bearing complex is driven piston rod; the middle part of the box body is vertically provided with a piston rod driving device, and the piston rod driving device comprises a motor fixing flange and a bearing flange which are respectively arranged at the middle parts of the upper surface and the lower surface of the box body. The utility model discloses a transmission structural design is exquisite, and transmission efficiency is high, and the energy consumption is little, and is rationally distributed, and occupation space is little, low in manufacturing cost, the miniaturized design of being convenient for.

Description

Metering pump piston rod driving device

Technical Field

The utility model relates to a measuring pump equipment technical field, concretely relates to measuring pump piston rod drive arrangement.

Background

Metering pumps are also referred to as dosing pumps or proportional pumps. The metering pump is a special volumetric pump which can meet the requirements of various strict process flows, can adjust the flow rate in a stepless manner and is used for conveying liquid (particularly corrosive liquid). Metering pumps are one type of fluid delivery machine that are characterized by the ability to maintain a constant flow rate independent of discharge pressure. The metering pump can simultaneously complete the functions of conveying, metering and adjusting, thereby simplifying the production process flow. By using a plurality of metering pumps, several media can be input into the process flow according to an accurate proportion for mixing. Due to its own prominence, metering pumps are now widely used in various industrial fields such as petrochemical industry, pharmaceutical industry, food industry, and the like.

The conventional metering pump mostly adopts a worm and gear transmission mode, power is transmitted through a worm and gear structure to drive a connecting rod mechanism, reciprocating motion of a piston rod of the metering pump is realized through a multi-connecting-rod structure or a structure combining a connecting rod and a sliding block, the transmission efficiency is low, the occupied space is large, the transmission mechanism is complex, the manufacturing cost is high, the energy consumption is high, the miniaturization design is not facilitated, and the metering pump is not suitable for being used under the conditions of smaller available space or lower cost budget.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model provides a metering pump piston rod driving device, which has an exquisite transmission structure design, a fan-shaped driving gear is arranged between two racks which are oppositely arranged in parallel, the transmission direction is changed by changing the rack which is meshed with the fan-shaped driving gear, the traditional driving mode that a worm gear mechanism drives a connecting rod or a slider-crank mechanism is replaced, the transmission efficiency is high, the energy consumption is low, the layout is reasonable, the occupied space is small, the manufacturing cost is low, and the design is convenient for miniaturization; the reciprocating speed of the piston rod can be adjusted by adjusting the rotating speed of the motor, so that the liquid volume pumped in unit time can be adjusted according to the requirement of work content.

The technical scheme of the utility model: the metering pump piston rod driving device comprises a fixed box body, wherein one end of the box body is provided with an end flange, a sliding bearing is arranged in the end flange, the other end of the box body is not closed, the end face of the box body is fixedly connected with an output end flange, a piston rod is arranged between the sliding bearing and the output end flange, the middle part of the piston rod is an annular sliding block, two racks which are oppositely arranged are arranged on the inner side of the annular sliding block along the length direction, two ends of the annular sliding block are provided with cylindrical rods, the cylindrical rod matched with the output end flange is an output end piston rod, and the cylindrical rod matched; the utility model discloses a gear box, including box upper and lower surface, box middle part is equipped with piston rod drive arrangement along the vertical, piston rod drive arrangement is including locating the motor mounting flange and the flange of accepting at box upper and lower surface middle part respectively, motor mounting flange upper end is equipped with driving motor, by last drive shaft and the footstep bearing that uses with driving motor cooperation from top to bottom be equipped with in proper order between motor mounting flange and the flange of accepting, the drive shaft passes annular slider, and its middle part is equipped with the fan-shaped drive gear who uses with rack cooperation.

Compared with the prior art, the utility model discloses a measuring pump piston rod drive arrangement has following progress:

(1) the transmission structure is designed skillfully, the sector drive gear is arranged between two parallel and oppositely arranged racks, the transmission direction is changed by changing the racks meshed with the sector drive gear, the traditional driving mode that a worm gear mechanism drives a connecting rod or a slider-crank mechanism is replaced, the transmission efficiency is high, the energy consumption is low, the layout is reasonable, the occupied space is small, the number of used parts is small, the reliability is high, the manufacturing cost is low, and the miniaturization design is convenient;

(2) the reciprocating speed of the piston rod can be adjusted by adjusting the rotating speed of the motor, so that the liquid volume pumped in unit time can be adjusted according to the requirement of work content.

Preferably, the sliding bearing is coaxial with the through hole of the output end flange, the inner wall of the box body is provided with an upper row of guide bearings and a lower row of guide bearings along the motion direction of the annular sliding block, and the annular sliding block is positioned between the upper row of guide bearings and the lower row of guide bearings. When the sliding bearing is coaxial with the through hole of the output end flange, the annular sliding block can rotate around the through hole, and the guide bearing plays a limiting role and prevents the annular sliding block from rotating.

Preferably, three guide bearings are arranged in each row in the transverse direction. When the annular sliding block slides, the annular sliding block is clamped by at least four guide bearings on one side, so that the annular sliding block can stably slide.

Further, as optimization, the guide bearing is fixedly connected with the inner side face of the box body in a threaded mode, and anti-loosening glue is coated at the threaded position. Threaded connection is comparatively stable, and the spiro union department is scribbled locking glue, and the screw thread pine takes off when preventing the direction bearing reversal.

Preferably, the sliding bearing is not coaxial with the through hole of the output end flange. The annular sliding block can not rotate, a guide bearing is not required to be additionally arranged, and the processing and assembling difficulty is reduced.

Preferably, the included angle between two tangent lines passing through the circle center of the fan-shaped side face of the fan-shaped driving gear ranges from 170 degrees to 150 degrees, and the number of teeth of the fan-shaped driving gear is less than that of the teeth of the single-side rack. The driving gear is prevented from rotating out of the range of the rack and cannot be meshed with the rack on the other side, so that reciprocating motion is realized.

Preferably, the racks are arranged asymmetrically, and when the sector driving gear rotates and the rear end gear tooth leaves the rack on one side, the front end gear tooth just enters a meshing state with the rack on the other side. The sector driving gear and the rack are always in a meshed state, self-locking can be achieved, and the piston rod is prevented from returning when the meshed rack is replaced by the sector driving gear.

Further, as optimization, the outer edges of the gear teeth at the two ends of the fan-shaped driving gear are rounded. The phenomenon of gear beating is prevented when the sector drive gear is replaced with the rack meshed with the sector drive gear.

Preferably, the maximum length of the inner cavity of the box body is 2 times of the maximum length of the rack. The piston rod is prevented from colliding with the box body when reaching the maximum stroke during reciprocating motion.

Preferably, the driving shaft is sleeved with a gear positioning retaining ring and a clamping ring, and the gear positioning retaining ring is positioned between the fan-shaped driving gear and the clamping ring. The sector driving gear is fixed, and the sector driving gear is prevented from moving up and down in the working process.

Preferably, the driving shaft is provided with a through hole along the length direction of the shaft. Play the role of weight reduction.

Drawings

Fig. 1 is a schematic structural diagram of a metering pump piston rod driving device of the present invention;

fig. 2 is a vertical sectional view of the metering pump piston rod driving device of the present invention;

fig. 3 is a transverse cross-sectional view of the initial state of the metering pump piston rod drive of the present invention;

fig. 4 is a transverse cross-sectional view of the metering pump piston rod drive of the present invention at the maximum stroke;

fig. 5 is a schematic structural view of the gear teeth of the present invention;

FIG. 6 is a top view of the gear teeth of the present invention;

fig. 7 is a schematic structural view of the piston rod of the present invention.

Reference numerals:

1-box, 11-end flange; 2-a sliding bearing; 3-piston rod driving device, 31-driving motor, 32-driving shaft, 33-collar, 34-gear positioning retaining ring, 35-sector driving gear, 351-gear tooth, 352-sector side face, 36-thrust bearing, 37-motor fixing flange and 38-bearing flange; 4-an output end flange; 5-a piston rod, 51-an annular sliding block, 52-a rack, 53-an output end piston rod and 54-a driven piston rod; 6-guide bearing.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments (examples), which are described herein for illustrative purposes only and are not intended to be a basis for limiting the present invention.

As shown in fig. 1-7, the utility model discloses a metering pump piston rod driving device, including fixed box 1, box 1 one end is equipped with end flange 11, be equipped with slide bearing 2 in the end flange 11, the other end is not sealed, and the terminal surface is connected with output end flange 4 admittedly, be equipped with piston rod 5 between slide bearing 2 and the output end flange 4, piston rod 5 middle part is annular slider 51, the inboard two racks 52 that set up relatively that are equipped with along length direction of annular slider 51 inboard, annular slider 51 both ends are equipped with cylindrical rod, and the cylindrical rod that cooperates with output end flange 4 is output end piston rod 53, and the cylindrical rod that cooperates with slide bearing 2 is driven piston rod 54; the middle part of the box body 1 is provided with a piston rod driving device 3 along the vertical direction, the piston rod driving device 3 comprises a motor fixing flange 37 and a bearing flange 38 which are respectively arranged at the middle parts of the upper surface and the lower surface of the box body 1, a driving motor 31 is arranged at the upper end of the motor fixing flange 37, a driving shaft 32 and a thrust bearing 36 which are matched with the driving motor 31 for use are sequentially arranged between the motor fixing flange 37 and the bearing flange 38 from top to bottom, the driving shaft 32 penetrates through an annular sliding block 51, and the middle part of the driving shaft is provided with a sector driving gear 35.

As shown in fig. 3, in the initial state, the stroke of the piston rod 5 is minimum, the sector drive gear 35 is disposed inward, and the gear teeth 351 at one end are meshed with the rack 52; the driving motor 31 is started, the sector driving gear 35 rotates towards the direction of the rack 52 meshed with the sector driving gear, and the piston rod 5 extends out; as shown in fig. 4, the last gear 351 of the sector drive gear 35 is disengaged from the rack 52, and when the last gear is engaged with the rack 52 on the other side, the piston rod 5 is retracted to perform a reciprocating motion.

The included angle between the fan-shaped side surfaces 352 of the fan-shaped driving gear 35 is 170-165 degrees, and the number of the gear teeth 351 is less than that of the single-side rack 52. The driving gear 35 is prevented from rotating out of the range of the rack 52 and cannot be meshed with the rack 52 on the other side to realize reciprocating motion, the degree of the included angle is determined by the number of the gear teeth 351, and the total number of the gear teeth 351 is usually 1-2 less than half of the gear teeth.

The racks 52 are asymmetrically arranged, and when the sector drive gear 35 rotates and the rear end gear tooth leaves the rack 52 on one side, the front end gear tooth just enters a meshing state with the rack 52 on the other side. The sector drive gear 35 and the rack 52 are always in a meshed state, self-locking can be achieved, and the piston rod 5 is prevented from retreating when the sector drive gear 35 is replaced with the meshed rack 52.

And the outer edges of the gear teeth at two ends of the sector driving gear 35 are rounded. The gear beating phenomenon is prevented when the sector drive gear 35 is replaced by the rack 52 meshed with the sector drive gear.

The maximum length of the inner cavity of the box body 1 is 2 times of the maximum length of the rack 52. The piston rod 5 is prevented from reaching the maximum stroke and colliding with the box body 1 when reciprocating.

The driving shaft 32 is sleeved with a gear positioning baffle ring 34 and a clamping ring 33, and the gear positioning baffle ring 34 is positioned between the fan-shaped driving gear 35 and the clamping ring 33. The sector drive gear 35 is fixed to prevent the sector drive gear 35 from moving up and down during operation.

The drive shaft 32 is provided with a through hole along the length direction of the shaft. Play the role of weight reduction.

Example 1

In order to prevent the piston rod 5 from rotating in the moving process, the sliding bearing 2 is coaxial with the through hole of the output end flange 4, the inner wall of the box body 1 is provided with an upper row of guide bearings 6 and a lower row of guide bearings 6 along the moving direction of the annular sliding block 51, and the annular sliding block 51 is positioned between the upper row of guide bearings 6 and the lower row of guide bearings 6. In order to ensure the smooth sliding of the annular slide block, the annular slide block 51 is clamped by at least four guide bearings 6 on one side when the annular slide block 51 slides. I.e. at least 3 guide bearings 6 per row in the transverse direction, for a total of 12 guide bearings 6.

To prevent the thread from loosening when the guide bearing 6 is reversed. The guide bearing 6 is fixedly connected with the inner side surface of the box body 1 in a threaded manner, and the threaded portion is coated with anti-loosening glue.

The threaded hole for assembling the guide bearing 6 is a through hole and is formed by processing the outer side surface of the box body 1 inwards.

Example 2

The sliding bearing 2 is not coaxial with the through hole of the output end flange 4. The annular slide block 51 can not rotate, and the guide bearing 6 does not need to be additionally arranged, so that the processing and assembling difficulty is reduced.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. Measuring pump piston rod drive arrangement, its characterized in that: the device comprises a fixed box body (1), wherein one end of the box body (1) is provided with an end flange (11), a sliding bearing (2) is arranged in the end flange (11), the other end of the box body is not closed, the end face of the box body is fixedly connected with an output end flange (4), a piston rod (5) is arranged between the sliding bearing (2) and the output end flange (4), the middle part of the piston rod (5) is provided with an annular sliding block (51), two racks (52) which are oppositely arranged are arranged on the inner side of the annular sliding block (51) along the length direction, two ends of the annular sliding block (51) are provided with cylindrical rods, the cylindrical rod matched with the output end flange (4) is an output end piston rod (53), and the cylindrical rod matched with the sliding; the improved structure of the piston rod driving device is characterized in that a piston rod driving device (3) is vertically arranged in the middle of the box body (1), the piston rod driving device (3) comprises a motor fixing flange (37) and a bearing flange (38) which are respectively arranged in the middle of the upper surface and the lower surface of the box body (1), a driving motor (31) is arranged at the upper end of the motor fixing flange (37), a driving shaft (32) and a thrust bearing (36) which are matched with the driving motor (31) are sequentially arranged between the motor fixing flange (37) and the bearing flange (38) from top to bottom, the driving shaft (32) penetrates through an annular sliding block (51), and a sector driving gear (35) matched with a rack.

2. The metering pump piston rod drive device according to claim 1, characterized in that: the sliding bearing (2) is coaxial with a through hole of the output end flange (4), an upper row of guide bearings (6) and a lower row of guide bearings (6) are arranged on the inner wall of the box body (1) along the motion direction of the annular sliding block (51), and the annular sliding block (51) is positioned between the upper row of guide bearings and the lower row of guide bearings (6).

3. The metering pump piston rod drive device according to claim 2, characterized in that: the guide bearing (6) is fixedly connected with the inner side surface of the box body (1) in a threaded manner, and the threaded portion is coated with anti-loosening glue.

4. The metering pump piston rod drive device according to claim 1, characterized in that: the sliding bearing (2) is not coaxial with the through hole of the output end flange (4).

5. The metering pump piston rod drive device according to claim 1, characterized in that: the included angle between two tangent lines passing through the circle center of the fan-shaped side surface (352) of the fan-shaped driving gear (35) ranges from 170 degrees to 150 degrees, and the number of teeth (351) is less than that of the single-side rack (52).

6. The metering pump piston rod drive device according to claim 5, characterized in that: the racks (52) are arranged asymmetrically, and when the sector driving gear (35) rotates and the rear end gear tooth leaves the rack (52) on one side, the front end gear tooth just enters a meshing state with the rack (52) on the other side.

7. The metering pump piston rod drive device according to claim 6, characterized in that: and the outer edges of the gear teeth at two ends of the fan-shaped driving gear (35) are rounded.

8. The metering pump piston rod drive device according to claim 1, characterized in that: the maximum length of the inner cavity of the box body (1) is 2 times of the maximum length of the rack (52).

9. The metering pump piston rod drive device according to claim 1, characterized in that: the driving shaft (32) is sleeved with a gear positioning baffle ring (34) and a clamping ring (33), and the gear positioning baffle ring (34) is positioned between the sector driving gear (35) and the clamping ring (33).

10. The metering pump piston rod drive device according to claim 9, characterized in that: the driving shaft (32) is provided with a through hole along the length direction of the shaft.