CN-119267142-B - Plunger pump with gas collection prevention function and control method thereof

CN119267142BCN 119267142 BCN119267142 BCN 119267142BCN-119267142-B

Abstract

The invention discloses a plunger pump with a gas collection prevention function and a control method thereof, wherein the plunger pump comprises a feeding screw, a main pump body, a pressure detection device and a control system; the main pump comprises a material cavity and a pumping assembly, wherein the material cavity is provided with a material cavity feeding hole, the material cavity feeding hole is connected with the feeding screw discharging hole, the pumping assembly is used for pumping materials in the material cavity, the pressure detection device is used for detecting pressure change in the material cavity, and the control system controls the pumping assembly to work according to the detection result of the pressure detection device so as to reduce energy consumption and prevent gas collection of a pipeline. Compared with the method for solving the problem of gas collection by arranging the exhaust valve or directly installing the charge level indicator, the method reduces the frequency of the problem of gas collection from root causes, and avoids direct contact between other parts of the detection device except the elastic coating and the sludge by adopting a coating mode, so that the accuracy and the reliability are higher than those of the method for directly installing the charge level indicator in the material cavity.

Inventors

CHEN ZHIPING
HE GUOPENG
SHI JIAXIN
MENG ZHENJING
ZHENG LISHEN

Assignees

广州中洲环保科技有限公司
广东中洲环保实业有限公司

Dates

Publication Date: 20260508
Application Date: 20241029

Claims (9)

1. The plunger pump with the anti-gas-collecting function is characterized by comprising a feeding screw, a main pump body, a pressure detection device and a control system; the feeding screw is provided with a feeding screw feed inlet and a feeding screw discharge outlet; the main pump body comprises a material cavity and a pumping assembly, wherein the material cavity is provided with a material cavity feeding port, and the material cavity feeding port is connected with a feeding screw discharging port; The pressure detection device is used for monitoring the pressure change in the material cavity in real time; The control system controls the operation of the pumping assembly according to the monitoring result of the pressure detection device so as to reduce energy consumption and prevent pipeline gas collection; The pressure detection device comprises a shell, a detection head, a connecting rod, a first proximity switch, a second proximity switch and an elastic coating film, wherein the outer edge of the elastic coating film is arranged between a side opening of a feeding screw discharge hole and the shell, the inner surface of the elastic coating film is connected with the detection head, the connecting rod is arranged in the detection head, the first proximity switch and the second proximity switch are arranged in the shell and used for detecting the position of the connecting rod, the installation positions of the first proximity switch and the second proximity switch in the shell are adjustable, when the second proximity switch sends out a signal, a control system controls a main pump body to pump, and when the first proximity switch sends out the signal, the control system controls the main pump body to stop pumping or slow down pumping speed.
2. The plunger pump with the gas collection prevention function according to claim 1, wherein when the pressure detection device detects that the material cavity is filled with the material to a first threshold value, the pressure detection device detects that a signal is sent, and the control system controls the pumping assembly to work so as to pump the material out of the material cavity of the main pump body.
3. The plunger pump with the gas collection prevention function according to claim 1, wherein when gas continuously enters the material cavity, the pressure detection device detects that the material in the material cavity is lowered to a second threshold value, the pressure detection device detects that a signal is sent, the control system controls the pumping assembly to stop working or slow down pumping speed, and the control system waits for the material to continuously fill the material cavity until the material cavity is filled with the material to the first threshold value and then the control system is restarted.
4. The plunger pump with the gas collection prevention function according to claim 1, wherein an opening is arranged on the side surface of the feeding screw discharge port and is connected with the opening of the pressure detection device.
5. The plunger pump with the gas collection prevention function according to claim 1, wherein the shell comprises a fixing frame, a connecting rod supporting frame and a proximity switch mounting frame, one end flange of the fixing frame is connected and fixed with a side opening flange of a feeding screw discharging hole, two sides of the connecting rod supporting frame are respectively connected with the proximity switch mounting frame and the fixing frame through a flange and bolts, and a waist-shaped hole is formed in one side of the proximity switch mounting frame so as to mount the first proximity switch and the second proximity switch.
6. The plunger pump with the gas collection prevention function according to claim 5, wherein a sealing plate is arranged at the left end and the right end of the connecting rod supporting frame, a through hole is formed in the center of the sealing plate, and a linear bearing is fixed in the through hole through bolts.
7. The plunger pump with the gas collection prevention function according to claim 1, wherein the connecting rod is a T-shaped connecting rod, one end of the T-shaped connecting rod is a round rod, threads are formed on the tail end of the round rod, the other end of the round rod is a circular plate, the T-shaped connecting rod penetrates through a linear bearing in a connecting rod supporting frame, the threaded end faces towards a fixing frame, and the circular plate end faces towards a proximity switch mounting frame.
8. The plunger pump with the gas collection prevention function according to claim 7, wherein the detection head is a circular plate, and a threaded hole is formed in the center of the circular plate so as to be fixedly connected with the T-shaped connecting rod through threads.
9. A control method for the plunger pump with the gas collection prevention function according to claim 1, characterized by comprising: When the material cavity of the main pump body is filled with the material, the elastic coating film of the pressure detection device is extruded to deform, so that the internal detection head is pushed to move in the direction away from the material cavity, the connecting rod is driven to move in the same direction until the second proximity switch detects the circular plate end of the T-shaped connecting rod and sends out a signal; When gas continuously enters the main pump body cavity, the filling rate of the material in the main pump body cavity is gradually reduced, when the force of the material to the elastic coating film is smaller than the force of the elastic coating film for recovering deformation, the detection head moves towards the direction close to the material cavity under the tensile force of the elastic coating film, the T-shaped connecting rod is driven to move towards the same direction until the second proximity switch stops sending signals, the first proximity switch detects the circular plate end of the T-shaped connecting rod and sends signals, and when the control system receives the signals, the control system controls the main pump body pumping assembly to stop working or slow down the pumping speed, and waits for the material to continuously fill the main pump body cavity until the material cavity is filled with the material and then restarted.

Description

Plunger pump with gas collection prevention function and control method thereof Technical Field The invention relates to a plunger pump with a gas collection prevention function and a control method thereof, which are particularly suitable for conveying sludge with a water content of more than 75% or similar high-concentration viscous materials. Background During pumping of sludge by the plunger pump, air is pumped into the interior of the pipeline if a shortage of material occurs but the plunger pump is still running. When air is gathered to a certain volume, the air has compressibility, and the plunger pump has intermittent time delay characteristic, so that the energy transmitted by the follow-up sludge in a single pumping stroke of the plunger pump is totally used for compressing the air in the pipeline, the pumping pressure value of the sludge in the pipeline at the rear end of the air and the back pressure value of the sludge in the pipeline at the front end of the air reach a balance, and the gathered air in the pipeline is compressed, rebounded and compressed to and fro, so that pumping failure is caused. Currently, for the fault of the pipeline gas collection of the sludge plunger pump, exhaust valves are usually arranged at the end part and the middle part of the pipeline. But the gas collecting position is uncertain, and the exhaust effect is poor. The material storage hopper is arranged at the feeding screw feeding end of the plunger pump, and the material level meter is directly arranged at the top or the side wall of the storage hopper to detect the material level, so that air is prevented from entering the plunger pump, but distortion failure of the material level meter is often caused due to viscosity and corrosiveness of sludge, and the root cause of gas collection is that the plunger pump cannot effectively ensure the continuity of pumped materials when pumping, so that excessive air is input into a pipeline along with the materials when the plunger pump is empty, and gas collection is caused. Therefore, it is necessary to develop a device that can monitor the air content of the pumped material and control the air content of the material during the sludge pumping process, thereby reducing the possibility of air collection. Disclosure of Invention In order to solve at least one problem in the prior art, the invention provides a plunger pump with a gas collection prevention function and a control method thereof, which are suitable for the plunger pump for conveying sludge with water content of more than 75% or similar high-concentration viscous materials. In order to achieve the above purpose, the technical scheme of the invention is as follows: in a first aspect, the invention provides a plunger pump with an anti-gas-collecting function, which comprises a feeding screw, a main pump body, a pressure detection device and a control system; the feeding screw is provided with a feeding screw feed inlet and a feeding screw discharge outlet; The main body pump comprises a material cavity and a pumping assembly, wherein the material cavity is provided with a material cavity feeding port which is connected with a feeding screw discharging port; the pressure detection device is used for detecting pressure change in the material cavity; The control system controls the pumping assembly to work according to the detection result of the pressure detection device, so that the energy consumption is reduced, and the pipeline gas collection is prevented. Further, when the pressure detection device detects that the material cavity is filled with the material to a first threshold value, the pressure detection device detects and sends out a signal, and the control system controls the pumping assembly to work so as to pump the material out of the material cavity of the main pump body. Further, when gas continuously enters the material cavity, the pressure detection device detects that the material in the material cavity is reduced to a second threshold value, the pressure detection device detects that a signal is sent, the control system controls the pumping assembly to stop working or slow down the pumping speed, and the control system waits for the material to continuously fill the material cavity until the material cavity is filled with the material to the first threshold value and then restarts. Further, an opening is arranged on the side face of the feeding screw discharge hole and is connected with the opening of the pressure detection device. The pressure detection device comprises a shell, a detection head, a connecting rod, a first proximity switch, a second proximity switch and an elastic coating film, wherein the outer edge of the elastic coating film is arranged between a side opening of a feeding screw discharging hole and the shell, the inner surface of the elastic coating film is connected with the detection head, the connecting rod is arranged in the detection head, the first proximity switch and