Self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning

Abstract

The application discloses a self-adaptive vacuum auxiliary and mechanical seal self-cleaning self-priming pump and relates to the technical field of self-priming pumps. The self-adaptive vacuum auxiliary and mechanical seal self-cleaning self-priming pump comprises a vacuum auxiliary tank, an electric stop valve, an electromagnetic flowmeter, a pump outlet pipeline, a cleaning filter and a self-priming pump. The vacuum auxiliary tank is provided with an inlet and an outlet, the outlet is connected with a suction inlet of the self-priming pump, and a pump outlet pipeline is connected to a discharge outlet of the self-priming pump. The pump outlet pipeline is provided with the electromagnetic flowmeter and two tubular branches. The electric stop valve is arranged on the tubular branch I, the tubular branch I is communicated with the vacuum auxiliary tank through a jet flow device, an outlet of the jet flow device is located in a Venturi tube, and the Venturi tube is located in the vacuum auxiliary tank. The tubular branch II of the pump outlet pipeline is connected with the cleaning filter, the cleaning filter is provided with a cleaning pipeline, and the cleaning pipeline is communicated with a cleaning pipeline of a mechanical seal in the self-priming pump. The self-adaptive vacuum auxiliary and mechanical seal self-cleaning self-priming pump solves the problem that the mechanical seal of the self-priming pump is prone to wear, does not need an additional power source for vacuum assistance, and remarkably improves the service life of the self-priming pump.

Description

Technical Field

[0001] This invention relates to the field of self-priming pump technology, and in particular to a self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning. Background Technology

[0002] Self-priming pumps often face complex operating environments in practical applications, requiring high operational stability, environmental adaptability, and long-term continuous operation capability under complex conditions. Their normal operation typically depends on the pumping, gas-liquid mixing, and gas-liquid separation processes during startup, as well as the subsequent stable delivery process. However, in actual operation, the suction inlet conditions of self-priming pumps are easily affected by factors such as changes in process conditions, leading to fluctuations in the suction inlet pressure. When these fluctuations occur at the suction inlet, the gas-liquid two-phase flow state within the pump is difficult to maintain stability, and the gas-liquid mixing and separation processes change frequently, resulting in reduced pumping capacity and pump vibration. Prolonged operation under such unstable conditions will affect the reliability and service life of the equipment.

[0003] To improve the starting performance of self-priming pumps, some existing technologies have attempted to use vacuum assist devices in conjunction with them. However, such vacuum assist devices typically require an additional power source, leading to a complex overall system structure and additional energy consumption and maintenance costs.

[0004] Furthermore, although relevant standards specify the structural components of mechanical seals, such as flushing and cooling pipes, existing mechanical seals for self-priming pumps still lack effective filtration mechanisms in the inlet pipes for the flushing medium. When self-priming pumps transport media containing solid particles, easily crystallizing, or easily settling substances, the medium enters the mechanical seal, causing wear and leakage, leading to a short service life. Frequent replacement of mechanical seals not only increases spare parts costs but also causes production interruptions due to downtime for maintenance. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An adaptive vacuum-assisted and mechanical seal self-cleaning self-priming pump includes a vacuum-assisted tank, an electric shut-off valve, an electromagnetic flowmeter, a pump outlet pipeline, a cleaning filter, and a self-priming pump. The vacuum-assisted tank has inlets and outlets on both sides. The outlet of the vacuum-assisted tank is connected to the suction inlet of the self-priming pump, and the discharge outlet of the self-priming pump is connected to a pump outlet pipeline for discharging high-speed media. An electromagnetic flowmeter for monitoring the flow rate of the high-speed media is installed in the pump outlet pipeline, which has two tubular branches. The electric shut-off valve is installed on tubular branch I, which is connected to the vacuum-assisted tank via an ejector. The ejector outlet is located in a Venturi tube. Inside the tube, the Venturi tube is located inside the vacuum auxiliary tank. The outlet of the Venturi tube is coaxially aligned with the outlet end face of the vacuum auxiliary tank and a gap is maintained. The jet injects high-speed medium into the Venturi tube, causing the Venturi tube to generate negative pressure, which draws in the air from the vacuum auxiliary tank and mixes it with the high-speed medium to form a gas-liquid mixture. The other side of the pump outlet pipeline, the tubular branch II, is connected to the cleaning filter. Under the high-speed rotation inside the cleaning filter, solid impurities in the high-speed medium are separated to form a cleaning medium. The cleaning filter is equipped with a cleaning pipeline for conveying the cleaning medium, and the cleaning pipeline is connected to the cleaning pipeline of the mechanical seal inside the self-priming pump.

[0006] Furthermore, the vacuum-assisted tank includes a tank body, a tank inlet pipe, and a tank outlet pipe; the tank inlet pipe and the tank outlet pipe are symmetrically arranged on the tank body.

[0007] Furthermore, the venturi tube includes a jet pressurization pipeline and a suction port, with the suction port located at the connection point between the jet pressurization pipeline and the inner wall above the vacuum auxiliary tank.

[0008] Furthermore, the jet pressurization pipeline has a small diameter pipeline in the middle, large diameter pipelines above and below, and the large diameter pipeline at the bottom is an arc-shaped bend.

[0009] Furthermore, the small-diameter pipe is coaxially aligned with the jet outlet end face while maintaining a gap.

[0010] Furthermore, the cleaning filter includes a cyclone filter, a filter inlet, a cleaning pressurization pipeline, and an impurity sedimentation cylinder; the filter inlet is connected to the cyclone filter, the top of the cyclone filter is connected to the cleaning pressurization pipeline, the top of the cleaning pressurization pipeline is connected to the cleaning pipeline, and an impurity sedimentation cylinder is installed at the bottom of the cyclone filter.

[0011] Furthermore, the impurity sedimentation cylinder is equipped with a sealing cap.

[0012] The advantages of this invention compared to the prior art are: (1) The high-speed medium discharged by the centrifugal pump drives the jet injector and generates negative pressure through the Venturi effect to perform vacuuming operation. No additional independent power source is required, which helps to simplify the overall structure and reduce energy consumption. The centrifugal pump outlet flow rate is monitored in real time by an electromagnetic flow meter. When the flow rate is lower than the rated value, the electric shut-off valve is automatically opened to allow the vacuum auxiliary tank to intervene in vacuuming. This realizes adaptive vacuum assistance during the start-up and operation of the self-priming pump without manual intervention, which significantly improves the level of automation and operational reliability. (2) The cleaning filter uses the principle of cyclone filtration to separate solid impurities in the medium and deposit them in the impurity settling cylinder. The cleaning medium is pressurized and sent into the mechanical seal flushing pipeline, which effectively avoids wear of the mechanical seal friction pair by the particulate medium and greatly extends the service life of the mechanical seal. (3) The mechanical seal flushing pipeline continuously sprays the cleaning medium between the dynamic ring and the stationary ring, which not only lubricates and cools, but also achieves self-cleaning of the sealing surface, further reducing the risk of seal failure; (4) The overall structure is reasonably designed and the components work together to adapt to complex working conditions such as solid particles and easily crystallizing media, which reduces the frequency of equipment downtime and maintenance and lowers maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall assembly structure in the working state of an embodiment of the present invention; Figure 2 This is a schematic diagram of the component structure of the vacuum auxiliary tank of the device of the present invention; Figure 3 This is a schematic diagram of the component structure of the cleaning filter of the present invention.

[0014] The reference numerals in the accompanying drawings of this instruction manual include: 1. Vacuum auxiliary tank; 2. Electric shut-off valve; 3. Electromagnetic flowmeter; 4. Pump outlet pipeline; 5. Cleaning filter; 6. Motor; 7. Base; 8. Coupling; 9. Mechanical seal; 10. Centrifugal pump; 101. Jet pressurization pipeline; 102. Jet injector; 103. Inlet; 104. Tank outlet pipeline; 105. Tank body; 106. Tank inlet pipeline; 501. Cleaning pipeline; 502. Cleaning pressurization pipeline; 503. Sealing cap; 504. Impurity sedimentation cylinder; 505. Cyclone filter; 506. Filter inlet. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] like Figures 1 to 3As shown, an adaptive vacuum-assisted and mechanical seal self-cleaning self-priming pump includes a vacuum-assisted tank 1, an electric shut-off valve 2, an electromagnetic flowmeter 3, a pump outlet pipeline 4, a cleaning filter 5, and a self-priming pump.

[0017] The self-priming pump has a base 7 at its bottom, and the motor 6 is mounted on the upper right side of the base 7. It is connected to the main shaft of the centrifugal pump 10 via a coupling 8, providing power to the centrifugal pump 10. The centrifugal pump 10, used for vacuuming, has a mechanical seal 9 inside, with a cleaning pipeline for flushing the mechanical seal 9. The centrifugal pump 10 has a tubular suction inlet and discharge outlet on its left side and top, respectively, and the pump outlet pipeline 4 is connected to the top of the centrifugal pump 10's discharge outlet.

[0018] Two tubular branches, tubular branch I and tubular branch II, are provided on both sides of the pump outlet pipe 4.

[0019] Furthermore, the tubular branch I connects to the vacuum auxiliary tank 1; the vacuum auxiliary tank 1 includes a tank body 105 as the main body, a tank inlet pipe 106 and a tank outlet pipe 104.

[0020] The tank inlet pipe 106 and the tank outlet pipe 104 are symmetrically arranged on the left and right sides of the tank body 105. The tank inlet pipe 106 is used to connect with the medium source to be pumped, and the tank outlet pipe 104 is used to connect with the suction port of the self-priming pump. That is, when the self-priming pump is working, the external medium enters the centrifugal pump 10 through the vacuum auxiliary tank 1 and is then discharged from the pump outlet pipe 4.

[0021] The tubular branch I is connected to the vacuum auxiliary tank 1 through the ejector 102. The outlet of the ejector 102 is located inside the venturi tube. The ejector 102 is used to spray part of the high-speed medium that will be introduced through the tubular branch I into the venturi tube, so that the venturi tube set inside the vacuum auxiliary tank 1, together with the ejector 102, forms a venturi effect, drawing the air inside the tank 105 into the venturi tube and mixing it with the high-speed medium to form a gas-liquid mixture.

[0022] In this embodiment, the venturi tube is connected to the upper inner wall of the vacuum auxiliary tank 1, and the outlet of the venturi tube is coaxially aligned with the outlet end face of the vacuum auxiliary tank 1 while maintaining a gap.

[0023] The main body of the venturi tube is a jet pressurization pipeline 101. An air intake 103 is provided at the connection between the jet pressurization pipeline 101 and the inner wall above the tank 105. The middle of the jet pressurization pipeline 101 is a small diameter pipeline, and the top and bottom are large diameter pipelines. The large diameter pipeline at the bottom is an arc elbow, which facilitates the delivery of the gas-liquid mixture into the centrifugal pump 10.

[0024] The jet injector 102 is located inside the upper large-diameter pipe and is coaxially aligned with the end face of the small-diameter pipe of the jet pressurization pipe 101 while maintaining a gap.

[0025] An electric shut-off valve 2 is also installed in the tubular branch I. The electric shut-off valve 2 is used to control the on / off state of the tubular branch I. At the same time, an electromagnetic flow meter 3 is installed in the pump outlet pipe 4 to detect the flow rate of the medium in the pump outlet pipe 4. The electromagnetic flow meter 3 automatically monitors the flow rate of the medium in the pump outlet pipe 4. The electromagnetic flow meter 3 uploads the detected medium flow rate signal to the control system. The control system can control the opening and closing state of the electric shut-off valve 2 according to the preset medium flow rate threshold.

[0026] On the other side of the pump outlet pipeline 4, the tubular branch II is connected to the cleaning filter 5 through the filter inlet 506. The top of the cleaning filter 5 is equipped with a cleaning pipeline 501 for transporting cleaning media, and the cleaning pipeline 501 is connected to the flushing pipeline of the mechanical seal 9.

[0027] The cleaning filter 5 includes a cyclone filter 505, a cleaning pressurization line 502, a sealing cap 503, and an impurity settling cylinder 504. The left side of the cyclone filter 505 is connected to a filter inlet 506 that introduces the medium in the pump outlet line 4 into the cleaning filter 5. The top of the cyclone filter 505 is connected to the cleaning pressurization line 502, which provides pressure for the delivery of the cleaning medium. The top of the cleaning pressurization line 502 is connected to the arc-shaped cleaning line 501.

[0028] Under the high-speed rotation inside the cyclone filter 505, dense solid impurities in the medium are separated by centrifugal force to form a cleaning medium. The cleaning medium is pressurized by the cleaning pressurization line 502 and then transported to the flushing line in the mechanical seal 9 via the cleaning line 501. A sedimentation tank 504 for storing solid impurities is installed at the bottom of the cyclone filter 505. A sealing cover 503 is installed on the right side of the sedimentation tank 504. Removing the sealing cover 503 allows for the removal of impurities.

[0029] The working principle of this invention is as follows: After the centrifugal pump 10 is started, the medium is discharged through the pump outlet pipe 4, and the electromagnetic flow meter 3 detects the flow rate of the medium in the pump outlet pipe 4 in real time.

[0030] When the flow rate in the pump outlet pipe 4 is less than the rated flow rate (e.g., during pump startup or when the suction volume is insufficient), the electromagnetic flowmeter 3 outputs a flow signal to the control system, which then controls the electric shut-off valve 2 to open. The Venturi tube in the vacuum auxiliary tank 1 assists the centrifugal pump 10 in performing a vacuuming operation. The ejector 102 ejects the high-speed medium accelerated by the centrifugal pump 10 to the jet pressurization pipe 101, forming a Venturi effect. The suction port 103 extracts the air from inside the tank 105 and mixes it with the high-speed medium. The resulting gas-liquid mixture returns to the suction port of the centrifugal pump 10 through the tank outlet pipe 104. The vacuum auxiliary tank 1 can assist the centrifugal pump 10 in completing the vacuuming process without the need for an additional power source.

[0031] When the outlet medium flow rate of centrifugal pump 10 reaches or exceeds the rated flow rate, the electromagnetic flowmeter 3 outputs a flow signal, which is controlled by the control system to close the electric shut-off valve 2, the vacuum assistance stops, and centrifugal pump 10 enters the normal conveying state.

[0032] During media transport, a portion of the high-speed media accelerated by the centrifugal pump 10 enters the cyclone filter 505 of the cleaning filter 5 through the filter inlet 506. Inside the cyclone filter 505, solid impurities in the high-speed media are separated from the cleaning media. The solid impurities settle in the impurity settling cylinder 504, while the cleaning media is transported to the flushing pipeline in the mechanical seal 9 via the cleaning pipeline 501. The flushing pipeline sprays the cleaning media, filtered by the cleaning filter 5, between the dynamic and stationary rings of the mechanical seal 9, achieving continuous flushing, lubrication, and cooling of the friction pair of the mechanical seal 9, effectively preventing impurities in the media from causing wear on the sealing surface. When the device is shut down, the sealing cover 503 can be opened to remove the impurities deposited in the impurity settling cylinder 504.

[0033] It is understood that this invention has been described through this embodiment, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this invention. Furthermore, under the teachings of this invention, these features and embodiments can be modified to suit specific circumstances and materials without departing from the spirit and scope of this invention. Therefore, this invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are protected by this invention.

Claims

1. A self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning, characterized in that, Includes vacuum auxiliary tank, electric shut-off valve, electromagnetic flow meter, pump outlet pipeline, cleaning filter and self-priming pump; The vacuum auxiliary tank has an inlet and an outlet on both sides. The outlet of the vacuum auxiliary tank is connected to the suction inlet of the self-priming pump. The discharge outlet of the self-priming pump is connected to a pump outlet pipeline for discharging high-speed media. An electromagnetic flowmeter for monitoring the flow rate of the high-speed media is installed in the pump outlet pipeline. Two tubular branches are installed in the pump outlet pipeline. An electric shut-off valve is installed on tubular branch I. Tubular branch I is connected to the vacuum auxiliary tank through an ejector. The outlet of the ejector is located inside a venturi tube. The venturi tube is located inside the vacuum auxiliary tank. The outlet of the venturi tube is coaxially aligned with the outlet end face of the vacuum auxiliary tank and a gap is maintained. The jet injects a high-speed medium into the venturi tube, creating a negative pressure in the venturi tube, which draws in the air from the vacuum-assisted tank and mixes it with the high-speed medium to form a gas-liquid mixture. The other side of the pump outlet pipeline, the tubular branch II, is connected to the cleaning filter. Under the high-speed rotation inside the cleaning filter, solid impurities in the high-speed medium are separated to form a cleaning medium. The cleaning filter is equipped with a cleaning pipeline for conveying the cleaning medium, and the cleaning pipeline is connected to the cleaning pipeline of the mechanical seal inside the self-priming pump.

2. The self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning as described in claim 1, characterized in that, The vacuum-assisted tank includes a tank body, a tank inlet pipe, and a tank outlet pipe; the tank inlet pipe and the tank outlet pipe are symmetrically arranged on the tank body.

3. The self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning as described in claim 1, characterized in that, The venturi tube includes a jet pressurization line and a suction port, and the suction port is provided at the connection between the jet pressurization line and the inner wall above the vacuum auxiliary tank.

4. The self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning as described in claim 3, characterized in that, The jet pressurization pipeline has a small diameter pipe in the middle, large diameter pipes above and below, and the large diameter pipe at the bottom is an arc-shaped bend.

5. The self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning as described in claim 4, characterized in that, The small-diameter pipe is coaxially aligned with the jet outlet end face and a gap is maintained.

6. The self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning as described in claim 1, characterized in that: The cleaning filter includes a cyclone filter, a filter inlet, a cleaning pressurization pipeline, and an impurity sedimentation cylinder; the filter inlet is connected to the cyclone filter, the top of the cyclone filter is connected to the cleaning pressurization pipeline, the top of the cleaning pressurization pipeline is connected to the cleaning pipeline, and an impurity sedimentation cylinder is installed at the bottom of the cyclone filter.

7. The self-priming pump with adaptive vacuum assistance and mechanical seal self-cleaning as described in claim 6, characterized in that: The impurity sedimentation cylinder is equipped with a sealing cap.

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