Plunger metering pump

Abstract

The utility model discloses a plunger metering pump, which relates to the technical field of metering pumps, and comprises a shell, a rotating shaft, a limiting plate, a rotating piece, a fixed disc and a plurality of plungers, the rotating shaft can drive the rotating piece to rotate and drive the plungers to rotate around the rotating shaft, and the limiting plate can be attached to a limiting plane and slide relative to the limiting plane. Two independent grooves are formed in the surface, facing the plunger, of the fixing disc, the extending paths of the two grooves are located on the projection, on the fixing disc in the axial direction of the rotating shaft, of the rotating path of the plunger, and the two grooves are the liquid outlet groove and the liquid suction groove correspondingly. Each plunger can independently inject liquid into the liquid outlet groove or independently suck liquid out of the liquid suction groove in the rotating process of the rotating shaft, and the plunger metering pump reduces pulsation of flow through the arrangement of the multiple plungers. The liquid suction groove and the liquid outlet groove are mutually independent, a one-way valve is not needed, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of metering pumps, in particular to a plunger metering pump. Background Art

[0002] Metering pumps are widely used in modern medicine, chemical industry, water treatment and other industries, and are mainly used for metering liquids. Metering pumps can be divided into plunger metering pumps and diaphragm pumps. When the existing plunger metering pump is working, the motor rotates and drives the worm to rotate. The worm makes the connecting rod reciprocate through the action of the worm gear mechanism and the eccentric wheel, and the connecting rod pushes the piston to reciprocate in the piston sleeve of the plunger metering pump. When the piston is pulled out of the piston sleeve, a vacuum is formed in the piston sleeve, the one-way suction valve opens, the one-way discharge valve closes, and the liquid enters the liquid storage chamber from the liquid inlet pipe; when the piston is pressed into the piston sleeve, the one-way suction valve closes, the one-way discharge valve opens, and the liquid is discharged from the liquid storage chamber from the liquid outlet, thereby completing the suction and discharge of the liquid. However, when the existing metering pump uses a single pump structure, because the single pump has a stroke, the liquid flow is pulsating, which will cause flow errors. For example, Chinese patent CN101439207B discloses a plunger metering pump for blood purification, which is a single pump structure. The driving motor drives the eccentric shaft to rotate, thereby driving the plunger body to move repeatedly in the plunger hole of the pump body. The water inlet check valve and the water outlet check valve will also open and close under the pressure of the liquid, thereby completing the liquid suction and discharge process. However, the liquid flow of the plunger metering pump is pulsating, and the pulsation of the flow will have a negative impact on the plunger metering pump; at the same time, multiple check valves need to be set, and the structure is relatively complicated. Therefore, there is an urgent need for a plunger metering pump with a multi-pump structure that can avoid flow pulsation and has a simple structure. Utility Model Content

[0003] The utility model aims to provide a plunger metering pump to solve the problems existing in the prior art, which can reduce the pulsation of flow and has a simple structure.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] A plunger metering pump comprises a housing, a rotating shaft, a limit plate, a rotating member, a fixed disk and a plurality of plungers, wherein at least a portion of the rotating shaft is arranged in the housing, the limit plate, the rotating member and the fixed disk are arranged in sequence along the axial direction of the rotating shaft, the rotating member is fixedly connected to the rotating shaft, a limit plane is fixedly arranged in the housing on the side of the limit plate away from the rotating member, the limit plane is parallel to and fits the limit plate, the limit member is sleeved on the rotating shaft and movably connected to the side of the limit plate away from the limit plane, the piston sleeves of each plunger are fixedly connected to the rotating member, and the end of the piston rod of each plunger used for pulling forms a ball joint connection with the limit plate. The rotating shaft can drive the rotating member to rotate and drive each of the plungers to rotate around the rotating shaft, the limiting plate can fit the limiting plane and slide relative to the limiting plane, the fixed disk is fixedly connected in the shell, and two independent grooves are provided on the surface of the fixed disk facing the plunger, and the extension paths of the two grooves are both located on the projection of the fixed disk along the axial direction of the rotating shaft on the rotation path of the plunger, the two grooves are respectively a liquid outlet groove and a liquid suction groove, a liquid outlet port is provided on the liquid outlet groove, and a liquid inlet port is provided on the liquid suction groove, and each of the plungers can independently inject liquid into the liquid outlet groove or independently suck out liquid from the liquid suction groove during the rotation of the rotating shaft.

[0006] Preferably, a fixed pressure plate is fixedly connected inside the shell, the fixed pressure plate is located on a side of the limiting plate away from the limiting member and is sleeved outside the rotating shaft, and a side of the fixed pressure plate close to the limiting plate is the limiting plane.

[0007] Preferably, the part of the rotating shaft located inside the outer shell is the inner rotating shaft, and the inner rotating shaft is respectively provided with a first bearing and a second bearing on the outside of both ends close to the outer shell, the outer ring of the first bearing is fixedly connected to the fixed pressure plate, and the outer ring of the second bearing is fixedly connected to the fixed plate.

[0008] Preferably, two ends of the rotating shaft extend out from two sides of the housing respectively.

[0009] Preferably, the distances from each plunger to the rotating shaft are equal, the distances between two adjacent plungers are equal, and both the liquid suction groove and the liquid outlet groove are arc-shaped grooves.

[0010] Preferably, the number of the plungers is 4-16.

[0011] Preferably, the plunger is a ceramic plunger.

[0012] Preferably, the rotating member is a turntable, and a plurality of mounting channels are provided on the turntable and are connected to two sides of the rotating member along the axial direction of the rotating shaft, and the piston sleeve is fixedly connected inside the mounting channels.

[0013] Preferably, the rotating part is made of corrosion-resistant non-metallic material.

[0014] Preferably, the limiting member is a sphere.

[0015] Compared with the prior art, the utility model has achieved the following technical effects:

[0016] The plunger metering pump provided by the utility model is provided with a plurality of plungers, the rotating shaft can rotate and drive the rotating member to rotate, the rotating member drives each plunger to rotate around each rotation, the plunger can drive the limit plate to rotate in accordance with the limit plane, because the limit plate is an inclined surface, the limit plate can drive the piston in the plunger to move repeatedly in the plunger sleeve during the rotation process, when the plunger rotates to the position corresponding to the liquid suction groove, the piston is away from the fixed disk, the plunger extracts the liquid in the liquid suction groove, and the liquid in the liquid suction groove is also replenished through the liquid inlet; when the plunger rotates to the position corresponding to the liquid outlet groove, the piston approaches the fixed disk, the plunger discharges the liquid into the liquid outlet groove, and the liquid is discharged from the liquid outlet. Since there are a plurality of plungers, during the rotation of the plunger, the plurality of plungers circulate the liquid suction and discharge, and the load is distributed on the plurality of plungers. Compared with the single plunger structure, the total flow pulsation of the plunger metering pump is effectively reduced, and the measurement accuracy is high; since the liquid outlet groove and the liquid suction groove are independent of each other and are not connected to each other, there is no need to set a plurality of one-way valves, and the structure is relatively simple. Therefore, the plunger metering pump provided by the utility model utilizes a structure of multiple plungers to effectively reduce flow pulsation; the liquid outlet trough and the liquid suction trough are independent of each other, so there is no need to set a one-way valve, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A sectional view of the plunger metering pump provided by the utility model;

[0019] Figure 2 for Figure 1 A top view of the middle fixed plate;

[0020] Figure 3 for Figure 1 A front view of the middle fixed plate;

[0021] In the figure: 1-housing, 2-rotating shaft, 21-limiting member, 22-first bearing, 23-second bearing, 3-limiting plate, 4-rotating member, 41-installation channel, 5-fixed plate, 51-liquid suction groove, 52-liquid outlet groove, 53-liquid inlet, 54-liquid outlet, 6-plunger, 61-piston, 62-piston sleeve, 7-fixed pressure plate, 71-limiting plane. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model aims to provide a plunger metering pump to solve the problems existing in the prior art, can reduce the pulsation of flow rate and has a simple structure.

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] The utility model provides a plunger metering pump, such as Figure 1-3As shown, it includes a shell 1, a rotating shaft 2, a limiting plate 3, a rotating member 4, a fixed disk 5 and a plurality of plungers 6. At least a portion of the rotating shaft 2 is arranged in the shell 1. The limiting plate 3, the rotating member 4 and the fixed disk 5 are arranged in sequence along the axial direction of the rotating shaft 2. The rotating member 4 is fixedly connected to the rotating shaft 2. A limiting plane 71 is fixedly arranged in the shell 1 on the side of the limiting plate 3 away from the rotating member 4. The limiting plane 71 is parallel to and fits the limiting plate 3. The limiting member 21 is sleeved on the rotating shaft 2 and movably connected to the side of the limiting plate 3 away from the limiting plane 71. The piston sleeve 62 of each plunger 6 is fixedly connected to the rotating member 4. The end of the piston 61 rod of each plunger 6 used for pulling forms a ball joint connection with the limiting plate 3. The rotating shaft 2 can drive the rotating member 4 to rotate and drive each plunger 6 to rotate around the rotating shaft 2. The limiting plate 3 can fit the limiting plane 71 and slide relative to the limiting plane 71. The fixed disk 5 is fixedly connected in the housing 1. The surface of the fixed disk 5 facing the plunger 6 is provided with two independent grooves. The extension paths of the two grooves are both located on the projection of the rotating path of the plunger 6 along the axial direction of the rotating shaft 2 on the fixed disk 5. The two grooves are respectively a liquid outlet groove 52 and a liquid suction groove 51. The liquid outlet groove 52 is provided with a liquid outlet 54, and the liquid suction groove 51 is provided with a liquid inlet 53. Each plunger 6 can separately inject liquid into the liquid outlet groove 52 or separately suck liquid out of the liquid suction groove 51 during the rotation of the rotating shaft 2. Among them, the liquid inlet 53 and the liquid outlet 54 are connected to the equipment outside the plunger metering pump through the liquid inlet pipe and the liquid outlet pipe respectively.

[0026] The plunger metering pump provided by the utility model is provided with a plurality of plungers 6. The rotating shaft 2 can rotate and drive the rotating member 4 to rotate. The rotating member 4 drives each plunger 6 to rotate around each rotation. The plunger 6 can drive the limiting plate 3 to rotate in contact with the limiting plane 71. Since the limiting plate 3 is an inclined surface, the limiting plate 3 can drive the piston 61 in the plunger 6 to move repeatedly in the piston sleeve 62 during the rotation. When the plunger 6 rotates to the position corresponding to the liquid suction groove 51, the piston 61 moves away from the fixed disk 5, and the liquid in the liquid suction groove 51 is extracted from the plunger 6, and the liquid in the liquid suction groove 51 is also replenished through the liquid inlet 53; when the plunger 6 rotates to the position corresponding to the liquid outlet groove 52, the piston 61 approaches the fixed disk 5, and the plunger 6 discharges the liquid into the liquid outlet groove 52, and the liquid is discharged from the liquid outlet 54. Since there are multiple plungers 6, during the rotation of the plunger 6, the multiple plungers 6 cyclically absorb and discharge liquid, and the load is distributed on the multiple plungers 6. Compared with the single plunger structure, the overall flow pulsation of the plunger metering pump is effectively reduced, and the negative impact of the flow pulsation on the plunger pump is reduced; since the liquid outlet groove 52 and the liquid suction groove 51 are independent of each other and not connected to each other, there is no need to set multiple one-way valves, and the structure is relatively simple.

[0027] In a preferred implementation of this embodiment, a fixed pressure plate 7 is fixedly connected in the housing 1, and the fixed pressure plate 7 is located on the side of the limiting plate 3 away from the limiting member 21 and is sleeved outside the rotating shaft 2, and the side of the fixed pressure plate 7 close to the limiting plate 3 is a limiting plane 71. The fixed pressure plate 7 can be stably fixed in the housing 1, thereby preventing the position of the positioning plane from changing and affecting the measurement accuracy.

[0028] In a preferred implementation manner of the present embodiment, the portion of the rotating shaft 2 located inside the outer shell 1 is the inner rotating shaft 2, and the inner rotating shaft 2 is respectively sleeved with a first bearing 22 and a second bearing 23 at both ends close to the outer shell 1. The outer ring of the first bearing 22 is fixedly connected to the fixed pressure plate 7, and the outer ring of the second bearing 23 is fixedly connected to the fixed plate 5.

[0029] In a preferred implementation of this embodiment, both ends of the rotating shaft 2 extend from both sides of the housing 1. One end of the rotating shaft 2 extending from the housing 1 is used for fixed connection with the rotating end of the motor, and the motor can drive the rotating shaft 2 to rotate; the other end of the rotating shaft 2 is used for connection with other structures, for example: the end of the rotating shaft 2 away from the motor is rotatably connected to the inside of a mounting hole.

[0030] In a preferred implementation manner of this embodiment, the distance between each plunger 6 and the rotating shaft 2 is equal, that is, the rotation trajectory of each plunger 6 is a circle with the rotating shaft 2 as the center and the distance of the plunger 6 from the rotating shaft 2 as the radius. The liquid suction groove 51 and the liquid discharge groove 52 are both arc grooves, and the distance between two adjacent plungers 6 is equal. The circular rotation route and the equidistantly arranged plungers 6 can facilitate the calculation of liquid flow during metering.

[0031] In a preferred implementation manner of this embodiment, 4 to 16 plungers 6 are provided.

[0032] In a preferred implementation of this embodiment, the plunger 6 is a ceramic plunger. The plunger 6 made of ceramic material has strong corrosion resistance and wear resistance. The use of the plunger 6 made of ceramic material can extend the service life of the plunger metering pump.

[0033] In a preferred implementation of this embodiment, the rotating member 4 is a rotating disk, and a plurality of mounting channels 41 are provided on the rotating disk along the axial direction of the rotating shaft 2 to connect the two sides of the rotating member 4, and the piston sleeve 62 is fixedly connected inside the mounting channels 41. The rotating disk and the mounting channels 41 on the rotating disk can protect the piston sleeve 62 disposed in the mounting channels 41, and prevent the piston sleeve 62 from being damaged by collision with the outside.

[0034] In a preferred implementation of this embodiment, the rotating member 4 is made of a corrosion-resistant non-metallic material. During the use of the metering pump, the rotating member 4 will inevitably come into contact with the liquid. The use of corrosion-resistant non-metallic materials can further extend the service life of the plunger metering pump.

[0035] In a preferred implementation of this embodiment, the limiting member 21 is a sphere.

[0036] The metering method of the plunger metering pump provided by the utility model is as follows: taking the plunger 6 at one end of the liquid suction groove 51 as the starting position, a plunger 6 is rotated one circle around the rotating shaft 2 from the starting position to the starting position as a single time (during the rotation of the plunger 6, it first passes through the entire liquid suction groove 51, and then passes through the entire liquid discharge groove 52). Each time the plunger 6 rotates one time, it completes one liquid suction and one liquid discharge. The amount of liquid transferred by the plunger 6 each time is the amount of liquid discharged from the liquid outlet 54 each time. The amount of liquid transferred by the plunger 6 each time is measured in advance, and the total amount of liquid transferred by the plunger 6 can be determined according to the number of circles the rotating shaft 2 rotates.

[0037] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A plunger metering pump, characterized in that: The invention comprises a shell, a rotating shaft, a limit piece, a limit plate, a rotating piece, a fixed disk and a plurality of plungers, wherein at least a part of the rotating shaft is arranged in the shell, the limit plate, the rotating piece and the fixed disk are arranged in sequence along the axial direction of the rotating shaft, the rotating piece is fixedly connected to the rotating shaft, a limit plane is fixedly arranged in the shell on the side of the limit plate away from the rotating piece, the limit plane is parallel to and fits the limit plate, the limit piece is sleeved on the rotating shaft and movably connected to the side of the limit plate away from the limit plane, the piston sleeves of the plungers are fixedly connected to the rotating piece, the piston rod of each plunger has a pulling end which forms a ball joint connection with the limit plate, and the The rotating shaft can drive the rotating member to rotate and drive each of the plungers to rotate around the rotating shaft, the limiting plate can fit the limiting plane and slide relative to the limiting plane, the fixed disk is fixedly connected in the shell, and two independent grooves are provided on the surface of the fixed disk facing the plunger, and the extension paths of the two grooves are both located on the rotation path of the plunger on the projection of the fixed disk along the axial direction of the rotating shaft, the two grooves are respectively a liquid outlet groove and a liquid suction groove, a liquid outlet port is provided on the liquid outlet groove, and a liquid inlet port is provided on the liquid suction groove, and each of the plungers can independently inject liquid into the liquid outlet groove or independently suck out liquid from the liquid suction groove during the rotation of the rotating shaft.

2. The plunger metering pump according to claim 1, characterized in that: A fixed pressure plate is fixedly connected inside the shell. The fixed pressure plate is located on a side of the limiting plate away from the limiting member and sleeved outside the rotating shaft. A side of the fixed pressure plate close to the limiting plate is the limiting plane.

3. The plunger metering pump according to claim 2, characterized in that: The part of the rotating shaft located inside the outer shell is the inner rotating shaft, and the inner rotating shaft is respectively sleeved with a first bearing and a second bearing on the outside of the two ends close to the outer shell. The outer ring of the first bearing is fixedly connected to the fixed pressure plate, and the outer ring of the second bearing is fixedly connected to the fixed plate.

4. The plunger metering pump according to claim 1, characterized in that: Two ends of the rotating shaft extend from two sides of the shell respectively.

5. The plunger metering pump according to claim 1, characterized in that: The distances between each plunger and the rotating shaft are equal, the distances between two adjacent plungers are equal, and both the liquid suction groove and the liquid outlet groove are arc-shaped grooves.

6. The plunger metering pump according to claim 5, characterized in that: The number of the plungers is 4 to 16.

7. The plunger metering pump according to claim 1, characterized in that: The plunger is a ceramic plunger.

8. The plunger metering pump according to claim 1, characterized in that: The rotating member is a rotating disk, and a plurality of mounting channels are provided on the rotating disk and are connected to two sides of the rotating member along the axial direction of the rotating shaft. The piston sleeve is fixedly connected inside the mounting channels.

9. The plunger metering pump according to claim 8, characterized in that: The rotating part is made of corrosion-resistant non-metallic material.

10. The plunger metering pump according to claim 1, characterized in that: The limiting member is a sphere.

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