WO2020252991A1

WO2020252991A1 - Pulsation-free metering pump

Info

Publication number: WO2020252991A1
Application number: PCT/CN2019/110791
Authority: WO
Inventors: 章建忠
Original assignee: 深圳市协鸿环保设备有限公司
Priority date: 2019-06-17
Filing date: 2019-10-12
Publication date: 2020-12-24
Also published as: CN110131123A

Abstract

A pulsation-free metering pump, comprising a brushless motor (1), pump heads (2), and a transmission box assembly (3). The brushless motor (1) is drivingly connected to the transmission box assembly (3). The pump heads (2) are disposed on the transmission box assembly (3), and the number of the pump heads (2) is N, N being greater than or equal to 3 and N being an integer. The pump heads (2) are evenly distributed in a plane with the transmission box assembly (3) as the center, adjacent pump heads (2) work in sequence with a phase difference along a time interval Φ which is equal to 360°/N, and the liquid outlet pipe (5) of each pump head (2) is provided with an air damper (6) corresponding thereto. The metering pump forms a star-shaped structure using at least three pump heads (2), and adjacent pump heads (2) work together in sequence with a certain phase difference along a time axis, reducing most of the pulsation of the device, and the air damper (6) on the liquid outlet pipe (5) of each pump head (2) absorbs the remaining pulsation, thereby implementing a pulsation-free metering pump.

Description

A kind of non-pulsation metering pump

Technical field

The invention relates to the field of metering pumps.

Background technique

Metering pump (Metering pump) is also called quantitative pump or proportional pump. The flow of metering pump can be steplessly adjusted within the range of 0-100%. It is a special volume pump used to transport liquids (especially corrosive liquids). The metering pump is a kind of fluid conveying machinery. Its outstanding feature is that it can maintain a constant flow rate independent of the discharge pressure. The metering pump can simultaneously complete the functions of delivery, metering and adjustment, thereby simplifying the production process. Using multiple metering pumps, several media can be input into the process flow in accurate proportions for mixing. Due to its own prominence, metering pumps have now been widely used in petrochemical, pharmaceutical, food and other industrial fields.

The current metering pumps are uniformly in the category of reciprocating pumps. Due to the reciprocating movement of the pump plunger, the input medium will inevitably produce pulsation. Such pulsation may have an adverse effect on the chemical reaction in the process flow, and it will also affect the process pipeline due to the water hammer effect. Produce shock and noise. If an accumulator is installed on the outlet pipeline, only part of the pulsation can be eliminated, and it is still unable to meet the high requirements for eliminating the pulsation phenomenon.

The prior art discloses a high-precision diaphragm metering pump with adjustable flow and no pulsation (application number: 200720038531.5). This utility model is composed of a motor, a transmission box and 5 pump heads; its main feature is that one end of the transmission box is uniform 5 pump heads are distributed, the liquid inlets of the 5 pump heads are all connected to a main liquid inlet pipe, and the liquid outlets of the 5 pump heads are all connected to a main liquid outlet pipe; in the transmission box The transmission part adopts a single eccentric wheel and a single connecting rod structure, and is connected by precise matching of bearings, changing the sliding friction motion between the traditional cam connecting rods to rolling friction motion, which can simultaneously drive the diaphragms in 5 cylinders in sequence It is used for pulling and drawing and pulling and pressing; the metering pump realizes the function of no pulsation, ensuring the accuracy of the metering pump, and greatly improving the control accuracy and quality of the process. However, the device uses 5 pump heads, its structure is complex, and the device has a high failure rate.

The prior art discloses a pulsation elimination device for a diaphragm metering pump (application number: 201820165281.X). The pulsation elimination device for a diaphragm metering pump is installed on a delivery pipeline and is close to the outlet end of the diaphragm metering pump, and includes a pipe body. Both ends of the pipe body are respectively fixedly connected with pipe caps that match the pipe body, and the pipe body and the pipe cap enclose a buffer chamber; one pipe cap is connected with a connection for connecting the delivery pipeline The connecting member has a hollow structure so that the buffer chamber communicates with the inside of the delivery pipeline.

The pulsation elimination device of the diaphragm metering pump is additionally installed on the conveying pipeline, but in actual application, it can only eliminate part of the pulsation, but cannot completely eliminate the pulsation of the metering pump.

Summary of the invention

In view of the shortcomings in the above-mentioned technology, the purpose of the present invention is to provide a pulsation-free metering pump, which uses at least three pump heads to form a star-shaped structure, and adjacent pump heads have a certain phase along the time axis. The difference works in sequence to reduce most of the pulsation of the device. In addition, an air damper is provided in each pump head to absorb the remaining pulsation, so as to realize a pulsation-free metering pump, and the device has a simple structure and effective use. Good and practical.

In order to achieve the above objectives, the present invention is implemented as follows:

A non-pulsation metering pump, comprising a brushless motor, a pump head and a transmission box assembly, the brushless motor is drivingly connected with the transmission box assembly, the pump head is arranged on the transmission box assembly, and is characterized in that the pump head The number is N, N is greater than or equal to 3 and N is an integer. Each pump head is evenly distributed in the plane with the transmission box assembly as the center. The adjacent pump heads have a phase difference along the time interval Φ=360°/N Work in sequence, and the liquid outlet pipe of each pump head is equipped with a corresponding air damper. The liquid inlet pipe of each pump head is connected to the main liquid inlet pipe. The liquid outlet pipes are all connected with the main liquid outlet pipe. Using multiple pump heads (N>=3) to work in sequence with a certain phase difference, reducing most of the pulsation generated by the metering pump during operation, plus each pump head is provided with a corresponding air damper, The air damper is used to absorb the remaining pulsation, so that the metering pump of the present application achieves the purpose of no pulsation. The brushless motor is the prior art, wherein the flow rate of the metering pump can be adjusted by the existing brushless motor controller, such as speed adjustment by built-in potentiometer, external analog voltage speed adjustment, external potentiometer speed adjustment, PWM Speed regulation and pulse frequency regulation.

Further, when the number of the pump heads is 3, the angle between each adjacent pump head is 120°, and the 3 pump heads work in sequence with a phase difference of 120°. When the number of pump heads of the metering pump is set to three, it is the most optimized embodiment. The structure design of the metering pump is relatively simple. When the number of pump heads is set to more than four, the structure will be relatively more complicated, and the pulsation will be reduced. The small effect is basically the same as the reduction effect of the 3 pump heads. Specifically, when it is set to 4 pump heads, the angle between adjacent pump heads is 90°, and the 4 pump heads work in sequence along the time axis with a 90-degree phase difference; when it is set to 5 pump heads, adjacent The included angle of the pump head is 72°, and the five pump heads work together in sequence along the 72° phase of the time axis.

Further, the air damper includes a casing and an upper cover, the casing is in a funnel shape, the bottom end of the casing is communicated with the liquid outlet pipe of the pump head, and the upper cover is closed on the top of the casing. The air damper and the liquid outlet pipe are enclosed to form a closed cavity, and the air damper is filled with air to provide a reverse force to the liquid in the liquid outlet pipe, eliminate other pulsations, and make the liquid stable Output.

Further, the transmission box assembly includes a box body, an eccentric shaft and a deep groove ball bearing, the deep groove ball bearing is sleeved on the eccentric shaft, the eccentric shaft and the deep groove ball bearing are both arranged in the center of the box, so The outer circle of the deep groove ball bearing is movably connected with the pump head. Utilizing the characteristics of the eccentric shaft, when the brushless motor drives the eccentric shaft to rotate, the eccentric shaft and the deep groove ball bearing sequentially push each pump head back and forth, thereby controlling the liquid intake and discharge of the pump head.

Further, the box body has a star-shaped structure, and the box body is adapted to the pump head.

Further, each pump head includes a pump housing, a diaphragm, a push rod unit, an inlet valve ball and an outlet valve ball, and the diaphragm, push rod unit, inlet valve ball and outlet valve ball are all arranged in the pump housing, so The inlet valve ball and the outlet valve ball are respectively arranged at the liquid inlet and outlet of the pump housing, one end of the push rod unit is movably connected with the transmission box assembly, and the other end of the push rod unit is connected with the diaphragm . Use the push rod unit to control the forward and backward reciprocating movement of the diaphragm, and then control the opening or closing of the inlet valve ball and the outlet valve ball, so as to realize the operation of liquid inlet and outlet of the pump head, that is, when the diaphragm is retracted, the inside of the pump head A vacuum is gradually formed, the inlet valve ball opens, and liquid is sucked in; when the diaphragm advances, the inlet valve ball closes, the outlet valve ball opens, and the liquid is discharged.

Further, the push rod unit includes a push rod, a spring and a push rod seat, the spring is sleeved on the push rod, one end of the push rod is movably connected with the transmission box, and the other end of the push rod is sleeved on the push rod. On the rod seat, the push rod seat is connected with the diaphragm. When the eccentric shaft and the deep groove ball bearing work, the outer circle of the deep groove ball bearing acts on the push rod to drive the push rod to reciprocate, thereby driving the diaphragm at the other end of the push rod to advance or retreat.

Further, the metering pump further includes a base, the base includes a base and a plurality of triangular brackets, the lower end of each triangular bracket is connected to the base, the upper end of each triangular bracket is connected to form a supporting plane, the transmission box The components are fixed on the supporting plane.

Furthermore, each triangular bracket is provided with a triangular groove, and the liquid inlet pipe of each pump head passes through the triangular groove and is connected to the corresponding pump head.

Further, the pump head and its corresponding liquid outlet pipe and liquid inlet pipe are all connected by a heavy-duty three-piece clamp. With clamp connection, the sealing effect is good and the pipe of the metering pump can be installed and disassembled quickly.

The advantage of the present invention is that the device uses at least 3 pump heads to form a star-shaped structure, and adjacent pump heads work in sequence with a certain phase difference along the time axis, thereby reducing most of the pulsation of the device. Each pump head is respectively provided with an air damper to absorb the remaining pulsation, thereby realizing a pulsation-free metering pump, and the device has a simple structure, good use effect and strong practicability.

Description of the drawings

Fig. 1 is a schematic diagram of the structure of a non-pulsation metering pump implemented by the present invention.

Fig. 2 is a top view of the non-pulsation metering pump implemented by the present invention.

Figure 3 is an exploded view of the structure of the non-pulsation metering pump implemented by the present invention.

Fig. 4 is a schematic diagram of the structure of the base in the non-pulsation metering pump implemented by the present invention.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

Figures 1-4 show a non-pulsation metering pump realized by the present invention. The non-pulsation metering pump mainly includes a brushless motor 1, a pump head 2 and a transmission box assembly 3, a brushless motor 1 and a transmission box assembly 3 Drive connection, the pump head 2 is arranged on the transmission box assembly 3, characterized in that the number of pump heads 2 is N, N is greater than or equal to 3 and N is an integer, and each pump head 2 is centered on the transmission box assembly 3 on the plane It is evenly distributed inside, and the adjacent pump heads 2 work in sequence along the time interval Φ=360°/N. The liquid inlet pipe 4 of each pump head 2 is connected to the main liquid inlet pipe 41. The liquid outlet pipe 5 of each pump head 2 is communicated with the main liquid outlet pipe 51, and the liquid outlet pipe 5 of each pump head 2 is provided with an air damper 6 corresponding to it. Using multiple pump heads 2 (N>=3) to work in sequence with a certain phase difference, reducing most of the pulsation produced by the metering pump during operation, plus each pump head 2 is provided with a corresponding air damping The device 6 utilizes the air damper 6 to absorb the remaining pulsation, so that the metering pump of the present application achieves the purpose of no pulsation. The brushless motor 1 is an existing technology. Among them, the flow rate of the metering pump can be adjusted by the existing brushless motor controller, such as the built-in potentiometer speed control, external analog voltage speed control, external potentiometer speed control, PWM control Speed and pulse frequency speed regulation.

In this embodiment, when the number of pump heads 2 is three, the angle between each adjacent pump head 2 is 120°, and the three pump heads work sequentially with a phase difference of 120 degrees.

In this embodiment, the air damper 6 includes a housing 61 and an upper cover 62. The housing 61 is in the shape of a funnel. The bottom end of the housing 61 is in communication with the liquid outlet pipe 5 of the pump head 2, and the upper cover 62 is closed. At the top of the housing 61. The air damper 6 and the liquid outlet pipe 5 are enclosed to form a closed cavity. The air damper 6 is filled with air, which provides a reverse force to the liquid in the liquid outlet pipe 5, eliminates other pulsations and makes Smooth liquid output.

In this embodiment, the transmission box assembly 3 includes a box body 31, an eccentric shaft 32 and a deep groove ball bearing 33. The deep groove ball bearing 33 is sleeved on the eccentric shaft 32, and the eccentric shaft 32 and the deep groove ball bearing 33 are both arranged on The center of the box 31 and the outer circle of the deep groove ball bearing 33 are movably connected with the pump head 2. Utilizing the characteristics of the eccentric shaft 32, when the brushless motor 1 drives the eccentric shaft 32 to rotate, the eccentric shaft 32 and the deep groove ball bearing 33 sequentially push each pump head 2 back and forth, thereby controlling the liquid inlet and discharge of the pump head 2 .

In this embodiment, the box body 31 has a star-shaped structure, and the box body 31 is matched with the pump head 2.

In this embodiment, each pump head 2 includes a pump housing 21, a diaphragm 22, a push rod unit 23, an inlet valve ball 24 and an outlet valve ball 25, the diaphragm 22, a push rod unit 23, an inlet valve ball 24 and The outlet valve ball 25 is arranged in the pump housing 21, the inlet valve ball 24 and the outlet valve ball 25 are respectively arranged at the liquid inlet and outlet of the pump housing 21, and one end of the push rod unit 23 is movably connected with the transmission box assembly 3. , The other end of the push rod unit 23 is connected with the diaphragm 22. The push rod unit 23 is used to control the forward and backward reciprocating movement of the diaphragm 22, thereby controlling the opening or closing of the inlet valve ball 24 and the outlet valve ball 25 to realize the liquid inlet and outlet operations of the pump head 2, that is, when the diaphragm 22 When moving backward, a vacuum is gradually formed in the pump head 2 and the inlet valve ball 24 is opened to suck in liquid; when the diaphragm 22 advances, the inlet valve ball 24 is closed and the outlet valve ball 25 is opened, and the liquid is discharged.

In this embodiment, the push rod unit 23 includes a push rod 231, a spring 232, and a push rod seat 233. The spring 232 is sleeved on the push rod 231, one end of the push rod 231 is movably connected to the transmission box 3, and the other of the push rod 231 One end is sleeved on the push rod seat 233, and the push rod seat 233 is connected with the diaphragm 22. When the eccentric shaft 32 and the deep groove ball bearing 33 work, the outer circle of the deep groove ball bearing 33 acts on the push rod 231 to drive the push rod 231 to reciprocate, thereby driving the diaphragm 22 at the other end of the push rod 231 to advance or retreat.

In this embodiment, the metering pump further includes a base 7. The base 7 includes a base 71 and a plurality of triangular brackets 72. The lower end of each triangular bracket 72 is connected to the base 71, and the upper end of each triangular bracket 72 is connected to form a The supporting plane 73 and the transmission box assembly 3 are fixed on the supporting plane 73.

In this embodiment, each triangular bracket 72 is provided with a triangular groove 74, and the liquid inlet pipe 4 of each pump head 2 passes through the triangular groove 74 and is connected to its corresponding pump head 2.

In this embodiment, the pump head 2 and its corresponding liquid outlet pipe 5 and liquid inlet pipe 4 are all connected by a heavy-duty three-piece clamp 8. With clamp connection, the sealing effect is good and the pipe of the metering pump can be installed and disassembled quickly.

When the number of pump heads 2 of the metering pump is set to three, it is an optimized embodiment. The structure design of the metering pump is relatively simple. When the number of pump heads is set to more than four, the structure will be relatively more complicated, and its pulsating The reduction effect is basically the same as the reduction effect of the 3 pump heads. Specifically, when it is set to 4 pump heads, the angle between adjacent pump heads is 90°, and the 4 pump heads work in sequence along the time axis with a 90-degree phase difference; when it is set to 5 pump heads, adjacent The included angle of the pump head is 72°, and the five pump heads work together in sequence along the 72° phase of the time axis.

The above are only preferred embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present invention.

Claims

A non-pulsation metering pump, comprising a brushless motor, a pump head and a transmission box assembly, the brushless motor is drivingly connected with the transmission box assembly, the pump head is arranged on the transmission box assembly, and is characterized in that the pump head The number is N, N is greater than or equal to 3 and N is an integer. Each pump head is evenly distributed in the plane with the transmission box assembly as the center. The adjacent pump heads have a phase difference along the time interval Φ=360°/N Work in sequence, and the liquid outlet pipe of each pump head is equipped with a corresponding air damper. The liquid inlet pipe of each pump head is connected to the main liquid inlet pipe. The liquid outlet pipes are all connected with the main liquid outlet pipe.
The non-pulsation metering pump according to claim 1, wherein when the number of the pump heads is 3, the angle between each adjacent pump head is 120°, and the three pump heads are 120° The degree phase difference works sequentially.
The non-pulsation metering pump according to claim 1, wherein the air damper comprises a casing and an upper cover, the casing is in the shape of a funnel, and the bottom end of the casing is connected to the liquid outlet pipe of the pump head Communicate with each other, and the upper cover is closed on the top of the shell.
The non-pulsation metering pump according to claim 1, wherein the transmission box assembly includes a box body, an eccentric shaft and a deep groove ball bearing, the deep groove ball bearing is sleeved on the eccentric shaft, and the eccentric shaft Both the shaft and the deep groove ball bearing are arranged in the center of the box body, and the outer circle of the deep groove ball bearing is movably connected with the pump head.
The non-pulsation metering pump according to claim 4, characterized in that the box body has a star-shaped structure, and the box body is adapted to the pump head.
The non-pulsation metering pump according to claim 1, characterized in that each pump head includes a pump housing, a diaphragm, a push rod unit, an inlet valve ball and an outlet valve ball, the diaphragm, push rod unit, Both the inlet valve ball and the outlet valve ball are arranged in the pump housing, the inlet valve ball and the outlet valve ball are respectively arranged at the liquid inlet and the liquid outlet of the pump housing, and one end of the push rod unit is movable with the transmission box assembly Connected, the other end of the push rod unit is connected with the diaphragm.
The non-pulsation metering pump according to claim 6, characterized in that the push rod unit includes a push rod, a spring and a push rod seat, the spring is sleeved on the push rod, and one end of the push rod is connected to the transmission The box is movably connected, the other end of the push rod is sleeved on the push rod seat, and the push rod seat is connected with the diaphragm.
The non-pulsation metering pump according to claim 1, characterized in that the metering pump further comprises a base, the base includes a base and a plurality of tripods, the lower end of each tripod is connected with the base, and each triangle The upper ends of the brackets are connected to form a supporting plane, and the transmission box assembly is fixed on the supporting plane.
The non-pulsation metering pump according to claim 8, wherein each triangular bracket is provided with a triangular groove, and the liquid inlet pipe of each pump head passes through the triangular groove and is connected to its corresponding pump head.
The non-pulsation metering pump according to claim 1, characterized in that the pump head and its corresponding liquid outlet pipe and liquid inlet pipe are all connected by a heavy-duty three-piece clamp.