A metering pump with diaphragm leak monitoring

Abstract

The utility model belongs to the technical field of metering pump, specifically is a kind of metering pump with diaphragm leakage monitoring, including pump body, conveying part, diaphragm and the driving part of driving diaphragm deformation, diaphragm includes first diaphragm and second diaphragm, and sealed cavity is formed between the two and cavity is filled with sealing liquid, second diaphragm is equipped with piezoelectric film near sealed cavity side, piezoelectric film is connected with the data of controller outside pump body by wire, the through-hole for wire to pass through in pump body is filled with sealant, nano magnetic particle is mixed in sealing liquid, the blind hole that conveying part is equidistantly provided around sealed cavity is assembled with hall sensor in blind hole, controller is built-in wireless module and buzzer, the utility model metering pump can realize diaphragm leakage double-stage monitoring, can early warning and detection accuracy is high, effectively avoid the risk of liquid leakage and measurement mutation.

Description

Technical Field

[0001] This utility model belongs to the field of metering pump technology, specifically a metering pump with diaphragm leakage monitoring. Background Technology

[0002] Diaphragm metering pumps are precision fluid transport devices widely used in chemical, pharmaceutical, water treatment, and oil and gas industries for the precise transport of corrosive, high-viscosity, or hazardous liquids. Diaphragm metering pumps have become the mainstream choice in industrial processes, especially in harsh environments such as petrochemical and nuclear power plants.

[0003] Existing diaphragm metering pumps mainly consist of the following parts: drive mechanism, transmission mechanism, pump head assembly, etc. Working principle: The drive mechanism drives the diaphragm to reciprocate. When the diaphragm is stretched outward, the pump chamber volume increases and a negative pressure is formed. The inlet check valve opens and the outlet valve closes, allowing fluid to be drawn in. When the diaphragm is compressed inward, the pump chamber volume decreases and pressure is generated. The outlet valve opens and the inlet valve closes, discharging fluid.

[0004] Current diaphragm metering pumps have the following drawbacks: they can only trigger an alarm after the diaphragm has completely ruptured and a large amount of fluid has leaked, and they cannot detect micro-cracks. This leads to a safety risk of contamination from small leaks during the micro-crack stage, and sudden diaphragm rupture can cause sudden changes in metering, leaving no time for maintenance. Furthermore, they often use a single detection method, which is susceptible to interference from temperature, impurities, etc., resulting in a high rate of false alarms and missed alarms. Therefore, a metering pump with diaphragm leakage monitoring is proposed to address the above problems. Utility Model Content

[0005] To address the shortcomings of existing diaphragm metering pumps, a metering pump with diaphragm leakage monitoring is proposed.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: The metering pump with diaphragm leakage monitoring described in this utility model includes a pump body, a conveying part, a diaphragm, and a driving part for driving the deformation of the diaphragm. The diaphragm includes a first diaphragm and a second diaphragm. The driving part is connected to the second diaphragm. The first diaphragm is close to the pump cavity. A sealing cavity is formed between the first diaphragm and the second diaphragm. The sealing cavity is filled with sealing liquid. A piezoelectric film is provided on the side of the second diaphragm close to the sealing cavity. The piezoelectric film is connected to the controller interface provided outside the pump body through a wire.

[0007] Preferably, the pump body has a through hole for the piezoelectric diaphragm wire to pass through, and the through hole is filled with sealant.

[0008] Preferably, the sealing fluid in the sealing cavity contains magnetic particles, and the conveying part has several blind holes equidistantly arranged around the sealing cavity. A Hall sensor is installed in each blind hole, and the Hall sensor is connected to the controller interface via a wire.

[0009] Preferably, the space between the Hall sensor and the inner wall of the blind hole is filled with thermally conductive silicone grease.

[0010] Preferably, the magnetic particles mixed in the sealed cavity are superparamagnetic Fe3O4 nanoparticles with a particle size of -nm, and the surface of the superparamagnetic Fe3O4 nanoparticles is coated with a modifier, the type of which is compatible with the properties of the sealing liquid in the sealed cavity.

[0011] Preferably, the controller has a built-in wireless module for remote data transmission and a buzzer for emitting an alarm sound.

[0012] The beneficial effects of this utility model are:

[0013] This utility model provides a metering pump with diaphragm leakage monitoring. Relying on the isolation effect of the sealed cavity and the ability of the piezoelectric film to sense abnormal deformation, it can detect the deformation deviation of the second diaphragm caused by the change in the volume of the sealing fluid and issue an early warning when the first diaphragm has micro-cracks but has not completely ruptured. This not only allows sufficient time for maintenance and avoids sudden changes in fluid pumping metering caused by sudden diaphragm rupture, but also blocks the leakage of a small amount of fluid that seeps in during the micro-crack stage through the sealed cavity.

[0014] The magnetic particles adapted to the sealing fluid, together with the Hall sensors arranged around the sealing cavity, can accurately identify the particle distribution disorder and magnetic field fluctuations caused by the influx of fluid when the first diaphragm is completely ruptured. This complements the piezoelectric film early warning function, effectively avoiding the risk of false alarms from a single monitoring method and improving the accuracy of leak detection. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a structural cross-sectional view of the present invention;

[0017] Legend:

[0018] 1. Pump body; 2. Conveying section; 3. Diaphragm; 301. First diaphragm; 302. Second diaphragm; 4. Drive section; 5. Pump chamber; 6. Sealing chamber; 7. Piezoelectric film; 8. Controller; 9. Blind hole; 10. Hall sensor. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Specific implementation examples are given below.

[0021] Please see Figure 1The present invention discloses a metering pump with diaphragm leakage monitoring, comprising a pump body 1, a conveying section 2, a diaphragm 3, and a driving section 4 for deforming the diaphragm 3. The conveying section 2 is provided with an inlet check valve and an outlet check valve communicating with a pump chamber 5 and an external pipeline. The diaphragm 3 includes a first diaphragm 301 and a second diaphragm 302. The driving section 4 is connected to the second diaphragm 302. The first diaphragm 301 is close to the pump chamber 5, and a sealed cavity 6 is formed between the first diaphragm 301 and the second diaphragm 302. The sealed cavity 6 is filled with sealing fluid. The conveying section 2 has a filling port for adding sealing fluid to the sealed cavity 6, and the filling port is provided with a plug. The second diaphragm 302 is close to the sealed cavity 6. A piezoelectric diaphragm 7 is provided on one side of the pump body 1. The piezoelectric diaphragm 7 is connected to the controller 8 externally located on the pump body 1 via a wire. The pump body 1 has a through hole for the wire of the piezoelectric diaphragm 7 to pass through, and the through hole is filled with sealant. The controller 8 has a built-in wireless module for remote data transmission and a buzzer for emitting an alarm sound. During operation, when the metering pump is working normally, the drive unit 4 drives the second diaphragm 302 to reciprocate. The sealing fluid in the sealing cavity 6 generates uniform pressure due to the deformation of the second diaphragm 302, which drives the first diaphragm 301 to reciprocate synchronously, thereby changing the volume of the pump cavity 5 and realizing the metering and delivery of the fluid to be delivered. During this process, the piezoelectric diaphragm 7 on the inner side of the second diaphragm 302 moves with the second diaphragm 302. The periodic deformation of membrane 302 continuously generates a stable periodic voltage signal, which is transmitted to controller 8 in real time via wires. Controller 8 records and stores the normal operating voltage reference curve. When the first diaphragm 301 develops micro-cracks due to aging and corrosion but does not completely rupture, a small amount of fluid to be transported in pump chamber 5 will seep into sealing chamber 6, causing a slight change in the volume of sealing fluid in sealing chamber 6. This disrupts the original periodic deformation pattern of the second diaphragm 302, manifesting as a deviation of the deformation amplitude from the reference value and disordered deformation period. After sensing this deformation anomaly, the piezoelectric film 7 will synchronously deviate from the normal operating voltage reference curve. After the controller 8 detects this abnormal signal, it will, on the one hand, transmit the "micro-crack" signal through the built-in wireless module to the controller 8. The "crack early warning data" is remotely transmitted to the staff terminal, and on the other hand, a buzzer is triggered to issue an audible and visual warning, reminding that the diaphragm is about to fail and needs to be prepared for maintenance. The joint between the piezoelectric film 7 and the second diaphragm 302 is filled with sealant to prevent the sealing liquid from seeping into the space between the piezoelectric film 7 and the second diaphragm 302 and affecting signal acquisition. At the same time, the sealant in the through hole of the pump body 1 can effectively block the leakage of the sealing liquid or the seeping fluid in the sealing cavity 6 from the wire passage, ensuring that the isolation function of the sealing cavity 6 is not damaged. Through the cooperation of the above structures, the piezoelectric film 7 can detect the abnormal deformation of the microcrack stage and issue an early warning in advance to reserve sufficient time for maintenance and reduce the sudden change in fluid pumping metering caused by the sudden rupture of the first diaphragm 301.

[0022] Furthermore, the sealing fluid within the sealed cavity 6 contains magnetic particles. Several blind holes 9 are equidistantly spaced around the sealed cavity 6 on the conveying unit 2. Hall sensors 10 are installed within each blind hole 9 and are connected to the controller 8 via wires. The magnetic particles mixed within the sealed cavity 6 are superparamagnetic Fe3O4 nanoparticles with a particle size of 10-50 nm. The surface of the superparamagnetic Fe3O4 nanoparticles is coated with a modifier, the type of which is compatible with the properties of the sealing fluid within the sealed cavity 6. During operation, when the metering pump is running normally, the sealing fluid within the sealed cavity 6... Due to the good compatibility between the surface modifier and the sealing fluid, and the flow disturbance of the sealing fluid caused by the reciprocating deformation of the second diaphragm 302, the superparamagnetic Fe3O4 nanoparticles always maintain a uniform dispersion. Since the superparamagnetic particles have no remanence in the absence of an external magnetic field, the uniformly dispersed particles will form a stable macroscopic magnetic field in the sealing cavity 6. The Hall sensors 10, which are equidistantly arranged along the sealing cavity 6, detect the magnetic field signal in real time. Because the particles are uniformly distributed, the difference in magnetic field strength detected by each sensor is <5%. This stable signal is transmitted to the controller 8 through the wire. The controller 8 determines that the diaphragm is normal and unbroken. When the first diaphragm... When membrane 301 ruptures completely, the fluid to be transported in pump chamber 5 will rush into sealing chamber 6. Due to the density and viscosity differences between the fluid to be transported and the sealing liquid, local eddies or stratification will be generated when they mix, thereby disrupting the uniform distribution of magnetic particles. In some areas, particles gather with the eddies, increasing the magnetic field strength, while in other areas, particles settle with the fluid, decreasing the magnetic field strength. At this time, the magnetic field strength detected by Hall sensor 10 will deviate from the reference value, and the signal difference between sensors will increase. After this abnormal magnetic field signal is transmitted to controller 8, controller 8 combines the previous micro-crack warning signal of piezoelectric film 7 or directly captures the magnetic field. Upon sudden change, the system determines that the first diaphragm has completely ruptured. It then sends an emergency alarm via wireless module and amplifies the buzzer's warning intensity, indicating the need for immediate shutdown and maintenance. Simultaneously, because the surface modifier of the magnetic particles is compatible with the sealing fluid, the particles will not chemically react with the fluid or agglomerate into large particles, thus avoiding interference with the deformation transmission of the second diaphragm 302. Through the coordination of these structures, a dual-level monitoring system is achieved, combining microcrack early warning with complete rupture confirmation. This complements the piezoelectric film 7's early warning system, solving the problem of early detection of microcracks while accurately confirming the complete rupture state through magnetic field detection, avoiding false alarms and improving detection accuracy.

[0023] Furthermore, thermally conductive silicone grease is filled between the Hall sensor 10 and the inner wall of the blind hole 9. During operation, the Hall sensor 10 generates heat over long-term operation. The thermally conductive silicone grease filling the space between the Hall sensor 10 and the inner wall of the blind hole 9 can, on the one hand, fill the tiny gap between the sensor and the inner wall of the blind hole, allowing the heat generated by the Hall sensor 10 during operation to be quickly conducted to the conveying part 2 where the blind hole 9 is located. Since the conveying part 2 is made of metal, it has good thermal conductivity and a large heat dissipation area. On the other hand, the thermally conductive silicone grease has a certain viscosity, which can enhance the adhesion between the Hall sensor 10 and the inner wall of the blind hole 9, preventing the Hall sensor 10 from shifting due to vibration during the operation of the metering pump, ensuring that the accuracy of its magnetic field strength detection is not affected by temperature, and continuously outputting a stable signal.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A metering pump with diaphragm leakage monitoring, comprising a pump body (1), a delivery section (2), a diaphragm (3), and a drive section (4) for driving the deformation of the diaphragm (3), characterized in that: The diaphragm (3) includes a first diaphragm (301) and a second diaphragm (302). The drive unit (4) is connected to the second diaphragm (302). The first diaphragm (301) is close to the pump chamber (5). A sealing cavity (6) is formed between the first diaphragm (301) and the second diaphragm (302). The sealing cavity (6) is filled with sealing liquid. A piezoelectric film (7) is provided on the side of the second diaphragm (302) close to the sealing cavity (6). The piezoelectric film (7) is connected to the interface of the controller (8) provided outside the pump body (1) through a wire.

2. The metering pump with diaphragm leakage monitoring according to claim 1, characterized in that: The pump body (1) has a through hole through which the piezoelectric diaphragm (7) wire passes, and the through hole is filled with sealant.

3. The metering pump with diaphragm leakage monitoring according to claim 1, characterized in that: The sealing fluid in the sealed cavity (6) contains magnetic particles. Several blind holes (9) are equidistantly opened around the sealed cavity (6) on the conveying part (2). A Hall sensor (10) is installed in the blind hole (9). The Hall sensor (10) is connected to the controller (8) via a wire interface.

4. A metering pump with diaphragm leakage monitoring according to claim 3, characterized in that: Thermally conductive silicone grease is filled between the Hall sensor (10) and the inner wall of the blind hole (9).

5. A metering pump with diaphragm leakage monitoring according to claim 1, characterized in that: The magnetic particles mixed in the sealed cavity (6) are superparamagnetic Fe3O4 nanoparticles with a particle size of 10-50 nm, and the surface of the superparamagnetic Fe3O4 nanoparticles is coated with a modifier. The type of modifier is compatible with the properties of the sealing liquid in the sealed cavity (6).

6. A metering pump with diaphragm leakage monitoring according to claim 1, characterized in that: The controller (8) has a built-in wireless module that can remotely transmit data, and a buzzer that can emit an alarm sound.

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