Anti-flooding submersible shielding electric pump

Abstract

The invention discloses an anti-flooding submersible shielding electric pump in the technical field of power equipment, which comprises a motor base, the motor base forms a wiring sealing cavity, a binding post is arranged in the wiring sealing cavity, the opening of the wiring sealing cavity is covered with a wiring box cover, and the covering part forms static seal through a wiring box cover sealing ring; a power line of the shielding electric pump is compressed and sealed through the conversion connector and then connected to the binding post together with a motor lead wire, the conversion connector is screwed into a motor base, static sealing is formed at the connecting position through a sealing ring, the power line penetrates into the cable sealing sleeve, and the conversion connector tightly presses the cable sealing sleeve through the compression nut. The motor base is adopted to form the wiring sealing cavity, the wiring sealing cavity is provided with the wiring box cover, and the wiring sealing cavity and the wiring box cover are statically sealed through the sealing ring, so that the sealing reliability is high, the whole machine can be prevented from being flooded by IP68 and can dive, and a user can freely select protection grade switching according to own installation environment requirements.

Description

Technical Field

[0001] The present invention relates to a waterproof and submersible canned motor pump, belonging to the technical field of power equipment. Background Art

[0002] A canned motor pump is a power equipment for conveying. The equipment mainly consists of components such as a pump body, an impeller, a stator, a rotor, front and rear bearings, and a thrust disk. The stator and the rotor are respectively isolated by non-magnetic corrosion-resistant thin-walled sleeves. The rotor is supported by the front and rear bearings and immersed in the conveying medium, so no type of dynamic seal is required to prevent the leakage of the conveyed medium to the outside.

[0003] In the prior art, gaskets are used for sealing between the junction box of the canned motor pump and the machine base and the junction box cover. There are many sealing positions, and the probability of external water and dust leaking into the motor is high and the risk is high. In addition, a waterproof connector is used for sealing when the external power cord is introduced into the wiring, and the protection level of IP68 submersible cannot be achieved. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a waterproof and submersible canned motor pump, which can not only make the whole machine achieve IP68 waterproof and submersible, but also facilitate users to freely select the protection level switch according to their own installation environment needs.

[0005] To achieve the above purpose, the following technical solution is adopted in the present invention:

[0006] The present invention provides a waterproof and submersible canned motor pump, including a motor base. The motor base forms a wiring sealing cavity by itself, and a wiring terminal is arranged in the wiring sealing cavity. A junction box cover is covered at the opening of the wiring sealing cavity, and a static seal is formed at the covering position through a junction box cover sealing ring. The power cord of the canned motor pump is compressed and sealed through an adapter and then connected to the motor lead wire on the wiring terminal together. The adapter is screwed into the motor base, and a static seal is formed at the connection through a sealing ring. The power cord penetrates into a cable sealing sleeve, and the adapter presses the cable sealing sleeve through a compression nut.

[0007] Furthermore, sealing glue one is injected at the gap where the motor lead wire is led out, and the power cord penetrates into the cable sealing sleeve and sealing glue two is injected between the two and solidifies into one body.

[0008] Furthermore, multiple groups of sensors are arranged in the wiring sealing cavity, and a processor connected to the wires of the multiple groups of sensors is arranged outside the wiring sealing cavity. After calculating the comprehensive waterproof performance score in the wiring sealing cavity according to the detection data of the multiple groups of sensors, the processor performs feedback control according to the score result.

[0009] Further, the multiple groups of sensors include humidity, pressure, and temperature sensors respectively used for monitoring the humidity change of the cavity, the dynamic pressure fluctuation of the cavity, and the temperature value of the cavity.

[0010] Further, when the comprehensive waterproof performance score reaches the warning level, the processor increases the sampling frequency to 5 Hz and sends an alarm signal; when the comprehensive waterproof performance score reaches the emergency level, the processor cuts off the power supply and activates the standby sealing device.

[0011] Further, the calculation formula for the comprehensive waterproof performance score is:

[0012] S = α·ΔH + β·P index + γ·(T current - T initial )

[0013] In the formula, S: comprehensive waterproof performance score, ΔH: humidity change rate; Pindex: dynamic pressure fluctuation index; α: weight coefficient one; β: weight coefficient two; γ: weight coefficient three; Tcurrent: current temperature value; Tinitial: initial temperature value.

[0014] Further, the calculation formula for the humidity change rate is:

[0015]

[0016] In the formula, ΔH: humidity change rate; Hcurrent: current humidity value; Hinitial: initial reference humidity; KT: temperature compensation coefficient; Δt: time interval.

[0017] Further, the calculation formula for the dynamic pressure fluctuation index is:

[0018]

[0019] In the formula: Pindex: dynamic pressure fluctuation index; Pi: the i-th pressure sampling value; Pressure mean value; Tavg: temperature mean value; N: number of data points within the sampling window.

[0020] Further, the processor calculates the humidity change rate every 10 seconds. When the humidity change rate exceeds the threshold, it starts the pressure fluctuation analysis; otherwise, it does not start.

[0021] Further, when the dynamic pressure fluctuation index exceeds the safe range three times in a row, the processor triggers the comprehensive score calculation; otherwise, it does not trigger.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention:

[0023] 1. The present invention eliminates the independent junction box and uses the motor base to form a wiring sealing cavity. A junction box cover is installed on the wiring sealing cavity, and a sealing ring is used for static sealing between the two, with high sealing reliability. In addition, a conversion joint is installed between the cable and the motor base. When the user does not require the protection level of IP68 waterproof and submersible, the conversion joint and the cable can be removed, which is convenient and fast, and the parts have stronger universality.

[0024] 2. This solution uses multi-parameter fusion detection. Through the dynamic correlation analysis of humidity, pressure, and temperature, the false alarm rate is significantly reduced; through the adaptive feedback mechanism, the detection strategy is adjusted according to real-time data to improve the ability to capture minor leaks; combined with the dynamic compensation technology, the interference of environmental temperature on the humidity sensor is eliminated to improve the detection accuracy; according to the hierarchical early warning system, a progressive response from early warning to emergency shutdown is achieved to ensure the safe operation of the equipment; the non-invasive design is adopted, and the detection can be completed without shutting down the equipment, greatly improving the equipment utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The schematic diagrams in the specification, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0026] Figure 1 is an overall schematic diagram of a waterproof and submersible canned motor pump provided by an embodiment of the present invention;

[0027] Figure 2 is a partial schematic diagram of a waterproof and submersible canned motor pump provided by an embodiment of the present invention;

[0028] In the figure: 1, motor base; 2, motor lead wire; 3, terminal; 4, junction box cover; 5, sealant one; 6, junction box cover sealing ring; 7, wiring sealing cavity; 8, conversion joint sealing ring; 9, conversion joint; 10, power cord; 11, compression nut; 12, sealant two; 13, cable seal; 14, exposed part of the cable after stripping. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0030] The following detailed descriptions are all exemplary descriptions, aiming to provide a further detailed description of the present invention. Unless otherwise specified, all technical terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention.

[0031] Example:

[0032] See also Figure 1 This embodiment provides a floodproof submersible canned motor pump. Figure 1 This type of floodproof submersible shielded electric pump cancels the independent terminal box of the motor, and adopts the motor base 1 to form a wiring sealed cavity 7. The wiring sealed cavity 7 is equipped with a terminal box cover 4. The terminal 3 is located in the wiring sealed cavity 7 formed by the motor base 1. The terminal box cover 4 covers the motor base 1, and a static seal is formed between the two by the terminal box cover sealing ring 6. The power cord 10 of the electric pump is compressed and sealed by the conversion joint 9, and then connected to the terminal 3 together with the motor lead wire 2. The sealing glue 5 is injected into the gap where the motor lead wire 2 is led out. The cable of the power cord 10 is stripped and exposed at the exposed part 14 to expose the inner core of the copper wire. The power cord 10 is inserted into the cable sealing sleeve 13, and the sealing glue 12 is injected between the cable sealing sleeve 13 and the power cord 10 and solidified into one, which can prevent water from flowing into the wiring sealed cavity through the gap between the copper wire core. The conversion joint 9 is screwed into the motor base 1, and a static seal is formed between the two by the conversion joint sealing ring 8. The solidified integrated power cord is inserted into the conversion connector 9, and the cable gland 13 is compressed by the compression nut 11 to form an IP68 protection level. When the user does not need the IP68 protection level, the conversion connector 9 and the power cord 10 can be removed and directly screwed into the ordinary waterproof connector.

[0033] The advantages of adopting the above sealing form are: the independent junction box is cancelled, and a wiring sealing chamber is formed by the motor base. The wiring sealing chamber is equipped with a junction box cover, and a sealing ring is used as a static seal between the two, which has high sealing reliability. In addition, the original user-purchased power cord is changed to the electric pump's own power cord, and the whole machine can be tested for air tightness before leaving the factory to ensure that it meets the requirements of waterproof and submersible use. Secondly, the copper wire core of the cable is potted to prevent the possibility of external water invading the inside of the motor through the gap between the wire cores. A sealing sleeve is added to the outside of the cable, and the sealing sleeve boss is pressed by a nut to form a static seal for waterproofing. Finally, a conversion connector is installed between the cable and the motor base. When the user does not need the IP68 waterproof and submersible protection level requirements, the conversion connector and cable can be removed, which is convenient and quick, and the parts are more versatile.

[0034] In order to further improve the waterproof performance of the canned motor pump, this solution proposes a detection method for leakage in the wiring sealing cavity. This method integrates the humidity, pressure and temperature sensor data and combines the dynamic compensation algorithm to evaluate the waterproof performance of the sealing cavity in real time. The core includes the following modules:

[0035] 1. Multi-parameter sensing module: built-in humidity sensor (monitoring cavity humidity changes), pressure sensor (detecting cavity dynamic pressure fluctuations), temperature sensor (compensating for environmental interference);

[0036] 2. Embedded processor: Performs dynamic threshold calculation and leakage risk assessment;

[0037] 3. Adaptive feedback module: Adjusts the sampling frequency and alarm threshold according to the detection results.

[0038] First, the embedded processor calculates the humidity change rate in real time according to the humidity change rate correction model to correct the influence of ambient temperature on humidity detection. The humidity change rate correction model is:

[0039]

[0040] In the formula, ΔH: Humidity change rate, used to determine whether to start pressure monitoring; Hcurrent: Current humidity value (source: real-time sampling of humidity sensor); Hinitial: Initial reference humidity (source: calibration value at system startup); KT: Temperature compensation coefficient (calculated from temperature sensor data); Δt: Time interval (source: system clock).

[0041] Second, the embedded processor periodically calculates the dynamic pressure fluctuation index according to the dynamic pressure fluctuation index to quantify the correlation between the pressure fluctuation amplitude in the sealed cavity and temperature, and judges the leakage risk through the dynamic pressure fluctuation index. The calculation formula of the dynamic pressure fluctuation index is:

[0042]

[0043] In the formula: Pindex: Dynamic pressure fluctuation index, used to evaluate whether the pressure fluctuation is abnormal; Pi: The i-th pressure sampling value (source: pressure sensor); Average pressure (calculated by the processor in real time); Tavg: Average temperature (source: temperature sensor data); N: Number of data points within the sampling window (preset value).

[0044] Then, the embedded processor triggers different levels of alarms (such as early warning, emergency shutdown) according to the comprehensive waterproof performance score result, and triggers hierarchical alarms by combining the comprehensive scores of humidity, pressure, and temperature. The calculation formula of the comprehensive waterproof performance score is:

[0045] S = α·ΔH + β·P index + γ·(T current - T initial )

[0046] In the formula, S: Comprehensive waterproof performance score, used as the final decision-making basis, and the processor controls the actuator to respond; α: Weight coefficient one; β: Weight coefficient two; γ: Weight coefficient three (all three weight coefficients are preset values, calibrated according to experiments); Tcurrent: Current temperature value; Tinitial: Initial temperature value.

[0047] In this embodiment, a canned motor pump for deep-sea operation is taken as an example, and the system deployment steps are as follows:

[0048] 1. Sensor installation: Install three groups of sensors for humidity, pressure, and temperature on the inner wall of the wiring sealing chamber, with a sampling frequency of 1 Hz;

[0049] 2. Initial calibration: Record Hinitial, Tinitial when the system starts, as a reference;

[0050] 3. Real-time calculation: The processor calculates ΔH every 10 seconds. If it exceeds the threshold, start the pressure fluctuation analysis; when Pindex exceeds the safe range three times in a row, trigger the comprehensive score calculation;

[0051] 4. Feedback control: If the score S reaches the warning level, increase the sampling frequency to 5 Hz and send an alarm signal; if it reaches the emergency level, cut off the power supply and start the standby sealing device. The warning level and the emergency level are both pre-set score standards.

[0052] This solution uses multi-parameter fusion detection. Through the dynamic correlation analysis of humidity, pressure, and temperature, the false alarm rate is significantly reduced; this solution uses an adaptive feedback mechanism to adjust the detection strategy according to real-time data, improving the ability to capture minor leaks; this solution combines dynamic compensation technology to eliminate the interference of environmental temperature on humidity sensors and improve the detection accuracy; this solution realizes a progressive response from warning to emergency shutdown according to the hierarchical warning system, ensuring the safe operation of the equipment; this solution adopts a non-intrusive design and can complete the detection without stopping the machine, greatly improving the equipment utilization rate. In summary, this solution solves the problems of poor real-time performance and high false alarm rate in traditional technologies through multi-parameter fusion and dynamic compensation algorithms, and has significant technological innovation and industrial application value.

[0053] As is known by technical common sense, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the specific implementation manners of the present invention can still be modified or equivalently replaced, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A flood-proof submersible canned motor pump, characterized in that: The invention comprises a motor base (1), wherein the motor base (1) forms a wiring sealed cavity (7), and a terminal (3) is arranged in the wiring sealed cavity (7). The opening of the wiring sealed cavity (7) is covered with a terminal box cover (4), and a static seal is formed at the closed position by a terminal box cover sealing ring (6). The power line (10) of the shielded electric pump is compressed and sealed by a conversion joint (9) and connected to the terminal (3) together with the motor lead wire (2). The conversion joint (9) is screwed into the motor base (1) and a static seal is formed at the connection position by a conversion joint sealing ring (8). The power line (10) is inserted into a cable sealing sleeve (13), and the conversion joint (9) compresses the cable sealing sleeve (13) by a compression nut (11).

2. The floodproof submersible canned motor pump according to claim 1 is characterized in that: Sealing glue one (5) is injected into the gap where the motor lead wire (2) is led out, the power line (10) is inserted into the cable sealing sleeve (13) and sealing glue two (12) is injected between the two to solidify into one.

3. The floodproof submersible canned motor pump according to claim 1 is characterized in that: The wiring sealed cavity (7) has multiple sets of sensors built in, and a processor connected to the multiple sets of sensor wires is arranged outside the wiring sealed cavity (7). The processor calculates a comprehensive score of the waterproof performance in the wiring sealed cavity (7) based on the detection data of the multiple sets of sensors, and performs feedback control based on the score result.

4. The floodproof submersible canned motor pump according to claim 3 is characterized in that: The multiple groups of sensors include humidity, pressure and temperature sensors for monitoring cavity humidity changes, cavity dynamic pressure fluctuations and cavity temperature values ​​respectively.

5. The floodproof submersible canned motor pump according to claim 3 is characterized in that: When the comprehensive waterproof performance score reaches the warning level, the processor increases the sampling frequency to 5 Hz and sends an alarm signal; when the comprehensive waterproof performance score reaches the emergency level, the processor cuts off the power supply and starts the backup sealing device.

6. The floodproof submersible canned motor pump according to claim 3 is characterized in that: The calculation formula for the comprehensive waterproof performance score is: S=α·△H+β·P index +γ·(T current -T initial ) In the formula, S is the comprehensive score of waterproof performance, ΔH is the humidity change rate, Pindex is the dynamic pressure fluctuation index, α is the weight coefficient one, β is the weight coefficient two, γ is the weight coefficient three, Tcurrent is the current temperature value, and Tinitial is the initial temperature value.

7. The floodproof submersible canned motor pump according to claim 6 is characterized in that: The calculation formula of the humidity change rate is: Where, ΔH: humidity change rate; Hcurrent: current humidity value; Hinitial: initial reference humidity; KT: temperature compensation coefficient; Δt: time interval.

8. The floodproof submersible canned motor pump according to claim 6 is characterized in that: The dynamic pressure fluctuation index calculation formula is: Where: Pindex: dynamic pressure fluctuation index; Pi: the i-th pressure sampling value; Pressure average; Tavg: temperature average; N: The number of data points in the sampling window.

9. The floodproof submersible canned motor pump according to claim 6 is characterized in that: The processor calculates the humidity change rate every 10 seconds, and starts the pressure fluctuation analysis when the humidity change rate exceeds a threshold, otherwise it does not start.

10. The floodproof submersible canned motor pump according to claim 6, characterized in that: When the dynamic pressure fluctuation index exceeds the safety range three times in a row, the processor triggers the calculation of the comprehensive score, otherwise it does not trigger it.

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