A metering fluid pump

Abstract

The application discloses a metering fluid pump, at least one permanent magnet is fixedly arranged on the circumference of the shaft of the fluid pump outside the cavity of the fluid pump and does not affect the normal working of the shaft, a Hall sensor is fixedly arranged on the shell, the permanent magnet rotates synchronously with the shaft in the fluid pump all the time, the Hall sensor picks up the magnetic signal on the shaft, further converts the received magnetic signal into an electric pulse signal, sends the amplified electric pulse signal to an integrator, and the integrator obtains the actual instantaneous flow, cumulative flow and related data of the fluid pump in working through operation; meanwhile, the synchronous metering and conveying of the fluid in abnormal state can be realized according to the data of the pressure sensor and the distance measuring sensor. The application can directly record and display the original flow, instantaneous flow, cumulative flow and other data of the fluid conveying in working, is suitable for various fluids, does not increase the resistance of the fluid in conveying, and is reliable in data in various fluid conveying equipment supporting application.

Description

Technical Field

[0001] This invention belongs to the field of fluid transport technology and relates to a metering fluid pump. Background Technology

[0002] In various fluid pumps, flow rate is a crucial parameter. The flow rate of a fluid passing through a pump is relatively fixed based on the pump's own structure and the displacement per revolution of the fluid-driving workpiece. The pump's flow rate parameter is calculated based on the pump's theoretical displacement per revolution, then in revolutions per minute or hour, or based on the revolutions of the electric motor, reducer, or engine driving the pump. In actual operation, pumps have different pipelines, different suction and delivery conditions in different working scenarios, and different fluids have different viscosities, densities, etc. Affected by these factors, the actual revolutions of the pump driven by the electric motor, reducer, or engine vary significantly in different working scenarios. Therefore, the flow rate parameters given by the pump manufacturer are reference data, while the actual flow rate value is obtained through various flow monitoring devices in the pipeline. Summary of the Invention

[0003] The purpose of this invention is to provide a metering fluid pump that achieves autonomous flow measurement based on the original working principle of the fluid pump. At the same time, this invention can directly eliminate the flow metering device in the original fluid transportation, simplify the fluid transportation equipment, eliminate the resistance of the flow meter to the fluid in the pipeline, and meet the requirements of fluid transportation monitoring and automated control.

[0004] The technical solution of this invention is a metering fluid pump, characterized in that: at least one permanent magnet is fixedly installed on the circumference of a shaft outside the pump cavity and without affecting the normal operation of the pump, rotating with the shaft; a Hall sensor is fixedly installed on the housing; the permanent magnet always rotates synchronously with the shaft in the fluid pump, the Hall sensor picks up the magnetic signal on the shaft, further converts the received magnetic signal into an electrical pulse signal, amplifies it, and connects it to an integrator or transmits it remotely to other computing and monitoring devices via wired or wireless means; the integrator or other computing and monitoring devices calculate the actual instantaneous flow rate and cumulative flow rate of the fluid pump based on the number of electrical pulse signals, the time, the actual number of revolutions, and the structural data, efficiency coefficient, and operating condition coefficient of the fluid pump.

[0005] Furthermore, a pressure sensor is installed at the fluid inlet of the fluid pump and connected to the integrator via wired or wireless means or transmitted remotely to other computing and monitoring devices; the integrator calculates the gas flow rate through the pump based on the pressure data.

[0006] Furthermore, a distance sensor is installed at the fluid inlet of the fluid pump, connected to an integrator via wired or wireless means, or transmitted remotely to other computing and monitoring devices. The distance sensor detects the presence or absence of fluid in front of the pump head, or the ratio of the cross-sectional area occupied by gas and liquid in the pump head inlet pipe diameter. The integrator determines the validity or invalidity of the synchronous instantaneous electrical pulse signal based on the presence or absence signal transmitted by the distance sensor, and uses the ratio of the cross-sectional area occupied by liquid in the pump head inlet pipe diameter as the synchronous instantaneous displacement coefficient of the fluid pump. Combined with the signal from the pressure sensor, the flow rates of gas and liquid are measured synchronously, and the gas-liquid mixed volume ratio is calculated to meet the measurement requirements of the gas-liquid mixed fluid.

[0007] Furthermore, when two or more permanent magnets are fixedly installed, these permanent magnets are evenly distributed on the circumference of the shaft, and their motion trajectories coincide when the shaft rotates.

[0008] Furthermore, the permanent magnets on the shaft are fixed by drilling, embedding, riveting, bonding, direct welding, threaded connection, or using a magnet retaining ring.

[0009] Furthermore, the fluid pump includes a dynamic fluid pump and a positive displacement fluid pump, which operate by transmitting power through shaft rotation.

[0010] Furthermore, the ranging sensor includes a laser ranging sensor, a radar ranging sensor, an ultrasonic ranging sensor, and an electro-optical ranging sensor.

[0011] The shaft referred to here is either the active shaft or the passive shaft in a fluid pump that connects impellers, blades, turbines, gears, and other components, thereby enabling the fluid to generate kinetic energy.

[0012] The beneficial effects of this invention are as follows: This metering fluid pump can directly provide and display the actual instantaneous flow rate, cumulative flow rate, and other data during operation. It is suitable for metering and conveying various fluids and gas-liquid mixtures, providing reliable data without increasing fluid resistance during transport. In various fluid transport equipment applications, this invention can directly eliminate the need for existing flow metering devices, simplifying fluid transport equipment and eliminating the flow meter's resistance to the fluid in the pipeline, thus meeting the monitoring requirements for automated fluid control and transport. Attached Figure Description

[0013] The invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram illustrating the working principle and structure of a vane centrifugal metering fluid pump in this invention. Figure 2 yes Figure 1 A partial cross-sectional schematic diagram of the central axis and the permanent magnet; Figure 3This is a schematic diagram illustrating the working principle and structure of a gear-type metering fluid pump in this invention. Figure 4 This is a partial cross-sectional schematic diagram of a permanent magnet fixedly installed using a magnet fixing ring in this invention; Figure 5 This is a partial cross-sectional schematic diagram of another type of fixed permanent magnet in this invention; Figure 6 This is a schematic diagram of a structure in this invention that uses a sensor bracket to fix and install a permanent magnet; Figure 7 This is a schematic diagram of the structure of a sliding (blade) type metering fluid pump equipped with a distance measuring sensor in this invention; Figure 8 This is a schematic diagram of a sliding (blade) type metering fluid pump in this invention, which is equipped with both a distance sensor and a pressure sensor. Explanation of reference numerals in the attached diagram: 1. Cavity; 2. Impeller; 3. Shaft; 4. Permanent magnet; 5. Hall sensor; 6. Connecting wire; 7. Integrator; 8. Housing; 9. Gear set; 10. Seal; 11. Nut; 12. Magnet retaining ring; 13. Sensor bracket; 14. Distance sensor; 15. Pressure sensor. Detailed Implementation

[0015] The metering fluid pump described in this invention is composed of at least one permanent magnet 4, one Hall sensor 5, and one integrator 7 added to various existing fluid pumps; the actual flow rate data is obtained by using the actual number of revolutions of the pump obtained by the synchronous rotation of the permanent magnet 4 with the pump shaft 3, and then using the pump's structural data, efficiency coefficient, operating condition coefficient, time and other parameters. The term "existing fluid pumps" refers to various types of dynamic and positive displacement fluid pumps, such as centrifugal pumps, axial flow pumps, vortex pumps, mixed flow pumps, external gear pumps, internal gear pumps, multi-gear / satellite gear pumps, cycloidal gear pumps, balanced compound gear pumps, single screw pumps, twin screw pumps, three screw pumps, multi-screw pumps, cam rotor pumps, Roots pumps, XHB rotary piston pumps, vane pumps, flexible impeller pumps, centrifugal fans, axial flow fans, mixed flow fans, crossflow fans, and Roots fans, including their single-stage, multi-stage, single-suction, and double-suction pump types.

[0016] In these pumps, the shaft rotation speed and flow rate are directly proportional. The displacement per rotation of the pump shaft 3 is determined by the pump's own structure and is a constant value. The flow rate is obtained by multiplying the rotation speed by the displacement per rotation. In large pumps, to improve metering accuracy, multiple permanent magnets 4 can be installed on the pump shaft, rotating on the same trajectory, and a Hall sensor 5 is used to pick up the signal. In a metering fluid pump with only one permanent magnet 4, the Hall sensor 5 outputs a pulse signal indicating that the pump shaft 3 has rotated one revolution. In a metering fluid pump with multiple permanent magnets 4, the number of pulse signals corresponding to one revolution of the shaft 3 is equal to the number of permanent magnets 4. In metering fluid pumps with complex structures and multiple shafts, the permanent magnets 4 can be installed on any shaft or on a workpiece that rotates synchronously with the shaft. The permanent magnets 4 are preferably installed on the shaft section outside the pump cavity that does not affect the normal operation of the pump, or they can be installed on the shaft section extending outside the pump housing 8. Furthermore, the permanent magnets 4 can be fixed to the shaft 3 using a magnet retaining ring 12.

[0017] According to the structure of the metering fluid pump, the permanent magnet 4 can be fixed on the shaft 3 by riveting, bonding, threaded connection or welding.

[0018] The totalizer 7 refers to various industrial instruments used to measure and accumulate physical quantities such as flow rate. It can identify, receive, count, and accumulate the pulse signals output by the Hall sensor 5. Then, based on the pump's structural data, efficiency coefficient, operating condition coefficient, time, and other parameters, it calculates and displays the instantaneous flow rate, cumulative flow rate, and other data of the pump. Furthermore, a distance sensor 14 is installed at the fluid inlet of the fluid pump. The integrator 7 determines the validity or invalidity of the synchronous instantaneous electrical pulse signal based on the presence or absence of the signal transmitted by the distance sensor 14, thereby eliminating erroneous records by the integrator 7 when the fluid pump is operating under no-load conditions. Using the proportion of the cross-sectional area occupied by the liquid in the pump head pipe diameter as the synchronous instantaneous displacement coefficient of the pump can further improve the flow measurement accuracy. Combined with the signal from the pressure sensor 15, the flow rates of gas and liquid can also be measured synchronously and separately, satisfying the measurement of gas-liquid mixed fluids. Furthermore, the specific functions of the integrator 7 can be configured as needed, and through human-computer interaction, it can realize functions such as alarm, data communication, and automatic control.

[0019] This invention can be widely used in conjunction with various fluid transport equipment that require metering and monitoring, and the metering method is direct and reliable. Example 1

[0020] See Figure 1 , Figure 2 ; Figure 1 This is a schematic diagram illustrating the working principle and structure of a vane centrifugal metering fluid pump according to the present invention. Figure 2 yes Figure 1A partial cross-sectional schematic diagram of the central shaft 3 and the permanent magnet 4; this embodiment is a dynamic metering fluid pump that uses the shaft 3 to drive the impeller 2 to rotate, thereby generating centrifugal force to transport the fluid in the cavity 1.

[0021] In this embodiment, to avoid affecting the pump's working efficiency, the permanent magnet 4 and the Hall sensor 5 are fixedly installed inside the pump housing 8, which is beneficial for a compact structure. At the same time, their position avoids the pump cavity 1, so it will not affect the pump's working efficiency. The permanent magnet 4 is set in the exposed shaft section of the shaft 3 inside the housing 8. Its position should be the position corresponding to the position where the Hall sensor 5 can receive the magnetic signal of the permanent magnet 4, and it is easy to fix and install on the housing 8. The connection line 6 of the Hall sensor is connected to the integrator 7. The integrator 7 is set in a conspicuous position on the housing 8 but does not affect the maintenance and operation of the pump. It has its own battery power supply, and its functions are configured as needed. In order not to disrupt the dynamic balance of the shaft 3 when rotating at high speed, the permanent magnet 4 is a strong magnetic cylindrical magnetic patch. Then, holes are drilled at the selected shaft section position according to the diameter and thickness of the magnetic patch, and the permanent magnet 4 is fixed to the shaft 3 by riveting.

[0022] During operation, the pump operates under the same working conditions and within the specified speed range. The displacement per revolution of shaft 3 remains constant and is relatively stable. When shaft 3 rotates once, permanent magnet 4 triggers Hall sensor 5 to give a pulse signal. Integrator 7 receives this signal, records and counts the actual number of revolutions of shaft rotation, and combines it with time, pump displacement, efficiency coefficient, calculates and displays relevant data such as instantaneous flow rate and cumulative flow rate of the pump. In actual use, the data calculated by integrator 7 is corrected by working condition coefficient.

[0023] This embodiment does not add any resistance to fluid transport in fluid metering and conveying, and the metering accuracy can reach 0.5 level. It is suitable for various liquid transport and can be used in conjunction with various liquid transport equipment. Example 2

[0024] See Figure 3 , Figure 3 This is a schematic diagram illustrating the working principle and structure of a gear-type metering fluid pump in this invention.

[0025] The difference between this embodiment and embodiment 1 is that this pump is a volumetric metering fluid pump that relies on the change and movement of the working volume formed between the pump chamber and the meshing gears to transport liquid or move and pressurize it; in this pump, the gear set 9 is respectively installed on the drive shaft 3 and the driven shaft, and the change and movement of the working volume is achieved by driving the drive shaft 3 to rotate synchronously to drive the gear set 9; Another difference is that the permanent magnet 4 is set on the sealed section of the drive shaft 3, and the fixing method is the same as in embodiment 1. The Hall sensor 5 is fixedly and sealed on the housing 8 by the seal 10 and the nut 11 to ensure that the pump chamber and the space outside the chamber are isolated from each other.

[0026] In this embodiment, the pressure protection level of the Hall sensor 5 should be consistent with the maximum operating pressure of the metering fluid pump.

[0027] In this embodiment, since the pump operates by transporting liquid through volume changes and movement, the accuracy of flow measurement is better compared to Embodiment 1.

[0028] This embodiment also does not introduce new resistance to the fluid during flow detection, and the metering accuracy can reach level 0.2. It is suitable for various liquid and gas transportation, can be used in various transportation equipment, or can be used directly as a metering pump. Example 3

[0029] See Figure 4 , Figure 4 This is a partial cross-sectional schematic diagram of a permanent magnet 4 fixedly mounted using a magnet fixing ring 12 in this invention.

[0030] In this embodiment, three permanent magnets 4 are used, evenly distributed on the circumference of the shaft; the permanent magnets 4 are fixed to the shaft 3 by magnet fixing rings 12; this structure does not affect the torsional strength of the shaft 3 and is suitable for use in various small flow metering fluid pumps. Example 4

[0031] See Figure 5 , Figure 5 This is a partial cross-sectional schematic diagram of another method for fixing and installing the permanent magnet 4 in this invention. The difference between this embodiment and embodiment 3 is that the permanent magnet 4 is not fixed using a magnet fixing ring, but instead uses a magnetic nail permanent magnet, which is directly fixed to the shaft through the screw hole on the shaft 3.

[0032] This embodiment is applicable to pumps with sufficient torsional strength of the pump shaft and sufficient space for installation. Example 5

[0033] See Figure 6 , Figure 6 This is a schematic diagram of a structure in this invention in which a permanent magnet 4 is fixedly mounted using a sensor bracket 13. The difference between the structure shown in this embodiment and that in embodiment 1 is that the permanent magnet 4 is set on the shaft segment of the exposed shaft 3 of the housing 8, and the Hall sensor 5 is fixed by the sensor bracket 13 fixed to the housing 8. This embodiment is suitable for application in the iterative upgrade of an existing fluid pump to a metering fluid pump. Example 6

[0034] See Figure 7 , Figure 7This is a schematic diagram of a sliding (blade) type metering fluid pump equipped with a distance sensor according to the present invention. In this embodiment, the pump's rotational speed electrical pulse signal is still set on the shaft 3 and the pump housing 8, the distance sensor 14 is set above the fluid inlet of the housing, and the distance sensor 14 is connected to the integrator 7 by a wired connection.

[0035] In operation, the method by which the integrator 7 calculates pump flow data is the same as in Example 1. This calculation method is based on the premise that the pump inlet is full of fluid, which is the normal working state. However, in abnormal working states, such as when the pump inlet is interrupted, or the pipe is not full, or the pipe is half full or less than half full of fluid, the result calculated by the integrator 7 under normal working state will inevitably have flaws. In such abnormal working states, the integrator 7 makes a valid or invalid determination of the synchronous rotational electrical pulse signal based on the real-time ranging signal given by the ranging sensor 14. At the same time, based on the ranging signal, it first calculates the area ratio occupied by the liquid in the pump inlet, and then uses this ratio as the pump displacement coefficient to achieve accurate measurement of fluid flow.

[0036] This embodiment is applicable to fluid transport under various normal and abnormal operating conditions and can be used in various fluid transport equipment. Example 7

[0037] See Figure 8 , Figure 8 This is a schematic diagram of a sliding (blade) type metering fluid pump in this invention, which is equipped with both a distance sensor and a pressure sensor. The difference between Embodiment 7 and Embodiment 6 is that a pressure sensor 15 is added above the fluid inlet of the housing 8, and the pressure sensor 15 is connected to the integrator 7 via a wired connection.

[0038] When this type of pump is used in the transportation of gas-liquid mixed fluids, the integrator 7 first calculates the area ratio of liquid and gas at the pump inlet based on the distance measurement signal of the distance sensor 14, and then uses this ratio as the pump displacement coefficient for each. Combined with the signal of the pressure sensor 15, the real-time pressure of the gas is calculated, and the flow data of gas and liquid can be calculated separately, so as to realize the synchronous measurement and transportation of gas and liquid flow.

[0039] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical methods of the present invention should be considered within the protection scope of the present invention.

Claims

1. A metering fluid pump, characterized in that: At least one permanent magnet (4) is fixedly installed on the circumference of the shaft (3) outside the cavity (1) of the fluid pump and does not affect the normal operation of the pump. It rotates with the shaft. A Hall sensor (5) is fixedly installed on the housing (8). The permanent magnet always rotates synchronously with the shaft in the fluid pump. The Hall sensor picks up the magnetic signal on the shaft and further converts the received magnetic signal into an electrical pulse signal. After amplification, it is connected to the integrator (7) by wired or wireless means or transmitted to other computing and monitoring devices. The integrator (7) or other computing and monitoring devices calculate the actual instantaneous flow rate and cumulative flow rate of the fluid pump based on the number of electrical pulse signals, the time and the actual number of revolutions, combined with the structural data, efficiency coefficient and operating condition coefficient of the fluid pump.

2. The metering fluid pump as described in claim 1, characterized in that: A pressure sensor (15) is installed at the fluid inlet of the fluid pump and connected to the integrator (7) via wired or wireless means or transmitted remotely to other computing and monitoring devices; the integrator (7) calculates the gas flow rate through the pump based on the pressure data.

3. The metering fluid pump as described in claim 2, characterized in that: A distance sensor (14) is installed at the fluid inlet of the fluid pump and connected to the integrator (7) via wired or wireless means or transmitted remotely to other computing and monitoring devices. The distance sensor (14) detects the presence or absence of fluid in front of the pump head, or the ratio of the cross-sectional area occupied by gas and liquid in the pump head inlet pipe diameter. The integrator (7) determines the validity or invalidity of the synchronous instantaneous electrical pulse signal based on the presence or absence signal transmitted by the distance sensor (14). The ratio of the cross-sectional area occupied by liquid in the pump head inlet pipe diameter is used as the synchronous instantaneous displacement coefficient of the fluid pump. Combined with the signal of the pressure sensor (15), the flow rates of gas and liquid are measured synchronously, and the gas-liquid mixing volume ratio is calculated to meet the measurement of gas-liquid mixed fluid.

4. The metering fluid pump as described in claim 1, characterized in that: When two or more permanent magnets (4) are fixedly installed, these permanent magnets (4) are evenly distributed on the circumference of the shaft (3) and their motion trajectories coincide when the shaft (3) rotates.

5. The metering fluid pump as described in claim 1, characterized in that: The permanent magnet (4) is fixed on the shaft (3) by drilling, embedding, riveting, bonding, direct welding, threaded connection, or by using a magnet retaining ring (12).

6. The metering fluid pump as described in claim 1, characterized in that: The fluid pumps include dynamic fluid pumps and positive displacement fluid pumps, which rely on the rotation of the shaft (3) to transmit power.

7. The metering fluid pump as described in claim 3, characterized in that: The ranging sensor (14) includes a laser ranging sensor, a radar ranging sensor, an ultrasonic ranging sensor, and an electro-optical ranging sensor.

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