CN113503238A

CN113503238A - Metering pump

Info

Publication number: CN113503238A
Application number: CN202110751744.7A
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: 2021-10-15
Also published as: CN110617193A

Abstract

The invention relates to a metering pump comprising a piston rod drive. The piston rod driving device comprises a fixed box body, 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 with the sliding bearing is a driven piston rod; the middle part of the box body is vertically provided with a piston rod driving mechanism, and the piston rod driving mechanism 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 transmission structure of the invention has the advantages of ingenious design, high transmission efficiency, low energy consumption, reasonable layout, small occupied space, low manufacturing cost and convenient miniaturization design.

Description

Metering pump

The application is a divisional application of an invention patent application with the patent application date of 09 and 11 in 2019, the patent application number of 201910856049.X and the name of the invention of a metering pump piston rod driving device.

Technical Field

The invention relates to the technical field of metering pump equipment, in particular to a metering pump with a specially-structured piston rod driving device.

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.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the metering pump, the transmission structure of a piston rod driving device in the metering pump is designed skillfully, the fan-shaped driving gear is arranged between two racks which are arranged oppositely in parallel, the transmission direction is changed by changing the rack meshed with the fan-shaped driving gear, the traditional driving mode that a worm gear mechanism drives a connecting rod or a crank sliding block 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 miniaturization design is convenient; 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 invention is as follows:

a metering pump comprising a piston rod drive; the piston rod driving device comprises a fixed box body, 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 with the sliding bearing is a driven piston rod; the box middle part is equipped with piston rod actuating mechanism along the vertical, piston rod actuating mechanism is including locating the motor mounting flange and accepting the flange 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 accepting flange, 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 metering pump provided by the invention has the following remarkable improvements:

(1) the transmission structure in the piston rod driving device 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, and the traditional driving mode that a worm gear mechanism drives a connecting rod or a crank block mechanism is replaced, so that the piston rod driving device has the advantages of high transmission efficiency, low energy consumption, reasonable layout, small occupied space, few used parts, high reliability, low manufacturing cost and convenience for miniaturization design;

(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, in the metering pump, 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 an optimization, in the metering pump, the guide bearing is fixedly connected with the inner side face of the box body in a threaded manner, and the threaded portion is coated with anti-loosening glue. 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, in the metering pump, 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, in the foregoing metering pump, an included angle between two tangent lines passing through the center of the circle of the fan-shaped side surface of the fan-shaped driving gear may range from 150 ° to 170 °, and the number of teeth of the fan-shaped driving gear is less than that of the single-sided 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, in the metering pump, the racks are asymmetrically arranged, and when the sector drive gear rotates and the rear end gear leaves the rack on one side, the front end gear 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 an optimization, in the metering pump, outer edges of gear teeth at two ends of the sector 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, in the metering pump, the maximum length of the inner cavity of the box body is 2 times of the maximum length of the annular rack. The piston rod is prevented from colliding with the box body when reaching the maximum stroke during reciprocating motion.

Preferably, in the foregoing metering pump, a gear positioning retaining ring and a retainer ring are sleeved on the drive shaft, and the gear positioning retaining ring is located between the sector drive gear and the retainer ring. The sector driving gear is fixed, and the sector driving gear is prevented from moving up and down in the working process.

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

Drawings

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

fig. 2 is a vertical cross-sectional view of the piston rod drive of the metering pump of the present invention;

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

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

FIG. 5 is a schematic illustration of a gear tooth according to the present invention;

FIG. 6 is a top plan view of a gear tooth in the present invention;

fig. 7 is a schematic view of the structure of the piston rod in 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) described herein, which are given solely for illustration of the invention and are not to be construed as limitations of the invention.

As shown in fig. 1-7, the metering pump of the present invention comprises a piston rod drive; the piston rod driving device comprises a fixed box body 1, 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 end flange is not closed, the end face of the end flange 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 an annular slide block 51, two racks 52 which are oppositely arranged are arranged on the inner side of the annular slide block 51 along the length direction, cylindrical rods are arranged at two ends of the annular slide block 51, 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 bearing 2 is a driven piston rod 54; the middle part of the box body 1 is provided with a piston rod driving mechanism 3 along the vertical direction, the piston rod driving mechanism 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 matched with a rack 52 for use.

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 two fan-shaped side surfaces 352 at two sides of the fan-shaped driving gear 35 can be 165-170 degrees, and the number of teeth 351 is less than that of the teeth 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 annular rack 31. 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 for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Measuring pump, its characterized in that: comprises a piston rod driving device;

the piston rod driving device comprises a fixed box body (1), 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 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 bearing (2) is a driven piston rod (54); the utility model discloses a motor, including box (1), piston rod actuating mechanism (3) are equipped with piston rod actuating mechanism (3) along vertical, piston rod actuating mechanism (3) are including motor mounting flange (37) and the receiving flange (38) of locating box (1) upper and lower surface middle part respectively, motor mounting flange (37) upper end is equipped with driving motor (31), by last drive shaft (32) and the footstep bearing (36) that use with driving motor (31) cooperation from bottom to top in proper order between motor mounting flange (37) and receiving flange (38), annular slider (51) are passed in drive shaft (32), and its middle part is equipped with fan-shaped drive gear (35) that use with rack (52) cooperation.

2. The dosing pump 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 dosing pump 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 dosing pump 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 dosing pump 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 150 degrees to 170 degrees, and the number of teeth of the gear teeth (351) is less than that of the single-side rack (52).

6. The dosing pump 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 dosing pump 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 dosing pump 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 annular rack (31).

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