Water pump and method for preventing / eliminating condensate water in water pump

Abstract

The invention discloses a water pump and a method for preventing / eliminating condensate water in the water pump, and the water pump comprises a stator, a pump shaft, a rotor, a bearing and a pump shell, and further comprises a control module, a humidity sensor, a wire inlet terminal and a temperature sensor. According to the water pump and the method for preventing / eliminating the condensate water in the water pump, formation or residue of the condensate water in the water pump can be effectively prevented, so that damage or failure of the water pump due to the condensate water can be avoided, the quality of the water pump can be improved, and the environment application range of the water pump is widened.

Description

Technical Field

[0001] The present invention relates to the technical field of water pumps, and particularly to a water pump and a method for eliminating internal condensate of the water pump. Background Art

[0002] A water pump is a machine that transports liquids or increases the pressure of liquids. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid, and is mainly used to transport liquids including water, oil, acid-base solutions, emulsions, suspension emulsions, and liquid metals, etc.

[0003] In special applications and / or under environmental conditions, condensate will be generated inside the water pump, which may cause damage or failure of the water pump bearing or the water pump motor.

[0004] Existing measures for the water pump motor to resist condensation are as follows: Method 1: Drainage holes are processed on the motor to discharge the condensate generated inside the motor. Method 2: Heating tapes are added inside the motor, and the heating tapes are powered separately to prevent the generation of condensate inside the motor. Method 3: Lip seals are installed on the motor end covers, and sealing rings are used at the connection of the motor housing to achieve IP68 protection for the entire motor and prevent environmental humid air from entering the inside of the motor.

[0005] However, the above measures for the water pump motor to resist condensation have many disadvantages and deficiencies: Method 1 can only discharge most of the condensate, and the condensate on the bearing surface cannot be discharged in time, and it cannot effectively prevent the condensate on the bearing surface from invading the inside of the bearing, causing rust. Method 2 requires power supply for the heating tapes, which increases additional parts and manufacturing costs. Usually, the operation logic is only for simple start and stop, and the energy consumption is relatively high. The initial effect of Method 3 is relatively good, but as the running time increases, the wear between the lip seal and the motor shaft intensifies, and it cannot achieve the effect of preventing environmental humid air from entering the inside of the motor.

[0006] Therefore, it can be seen that based on the deficiencies in the prior art, whether it is possible to provide an improved water pump and a method for preventing / eliminating internal condensate of the water pump has become a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects in the prior art and provide a water pump and a method for preventing / eliminating internal condensate of the water pump.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] A water pump includes a stator, a pump shaft, a rotor, a bearing, and a pump housing, and further includes:

[0010] A control module that controls the power on and off of the water pump through circuit logic;

[0011] An incoming line terminal electrically connected to the control module;

[0012] A humidity sensor, installed on the pump housing and electrically connected to the incoming line terminal;

[0013] A temperature sensor, installed on the outer surface of the pump housing and electrically connected to the incoming line terminal;

[0014] A water pump status monitoring device, installed on the pump housing and electrically connected to the incoming line terminal, for monitoring the operating status / operating speed of the water pump.

[0015] Preferably, the water pump status monitoring device is a water flow sensor, which is installed inside the water inlet of the water pump and electrically connected to the incoming line terminal. The water flow sensor detects the operating status / operating speed of the water pump and transmits the signal to the control module through a communication cable.

[0016] Preferably, the water pump status monitoring device is an inverter, which is electrically connected to the incoming line terminal. The control module obtains the operating status / operating speed of the water pump by reading the output signal of the inverter.

[0017] Preferably, the control module includes:

[0018] A microprocessor, electrically connected to the humidity sensor, the temperature sensor and the water flow sensor through the incoming line terminal;

[0019] A relay, electrically connected to the microprocessor;

[0020] A contactor, electrically connecting the power supply, the water pump and the relay.

[0021] Preferably, the control module includes:

[0022] A microprocessor, electrically connected to the humidity sensor, the temperature sensor and the inverter through the incoming line terminal;

[0023] A relay, electrically connected to the microprocessor;

[0024] The inverter is electrically connected to the power supply, the microprocessor, the relay and the water pump.

[0025] A method for preventing / eliminating internal condensate of a water pump, which is used to prevent / eliminate internal condensate of the above-mentioned water pump. The method includes the following steps:

[0026] Detect the relative humidity of the ambient air of the water pump through the humidity sensor and calculate the dew point temperature;

[0027] Detect the surface temperature of the water pump through the temperature sensor and calculate the internal temperature of the water pump;

[0028] Monitor the operating state / operating speed of the water pump through the water pump state monitoring device;

[0029] Compare the calculated value of the internal temperature with the corresponding dew point temperature. When the internal temperature is at or below the dew point temperature and the operating state / operating speed of the water pump is in a stopped / low-speed operation state, infer that condensate is about to be generated or has already been generated;

[0030] Control the response of the anti-condensation measure, heat the inside of the water pump, and prevent the generation of condensate / remove the generated condensate.

[0031] Preferably, calculate the dew point temperature by the dew measurement method, and / or calculate the dew point temperature by detecting the vapor pressure of the actual environment.

[0032] Preferably, perform a correction calculation on the dew point temperature according to the different atmospheric pressures at the installation location of the water pump.

[0033] Preferably, use the surface temperature or the internal temperature to establish a heat transfer model of the stator, the rotor, and the bearing.

[0034] Preferably, calculate the possible internal condensation positions according to the structural characteristics of the water pump and the heat transfer model, and determine one or more calculated values of the internal temperature.

[0035] Preferably, when comparing the calculated value of the internal temperature with the corresponding dew point temperature, the calculation model takes the condensation formation time as a logical condition for the response of the anti-condensation measure.

[0036] Preferably, after inferring that condensate is about to be generated or has already been generated, use a data calculation unit to collect and process signals and store events.

[0037] Preferably, heat the inside of the water pump by supplying a DC power supply or a single-phase power supply lacking a phase to the rotor.

[0038] On the basis of conforming to the common knowledge in the art, the above preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0039] The positive and progressive effects of the present invention are as follows: The water pump of the present invention and the method for preventing / eliminating internal condensate of the water pump, wherein the water pump includes a stator, a pump shaft, a rotor, a bearing, and a pump casing, and further includes a control module, a humidity sensor, an incoming line terminal, and a temperature sensor. The water pump of the present invention and the method for preventing / eliminating internal condensate of the water pump can effectively prevent the formation or residue of internal condensate of the water pump, thereby being able to avoid the water pump being damaged or malfunctioning due to condensate, and further being able to improve the quality of the water pump and expand the environmental application range of the water pump. Brief Description of the Drawings

[0040] Figure 1 This is a schematic structural diagram of the water pump according to Embodiment 1 of the present invention.

[0041] Figure 2 This is a schematic diagram of the installation position of the temperature sensor according to Embodiment 1 of the present invention.

[0042] Figure 3 This is an electrical connection diagram according to Embodiment 1 of the present invention.

[0043] Figure 4 This is an electrical connection diagram according to Embodiment 2 of the present invention.

[0044] Figure 5 This is a flowchart of the method according to Embodiment 3 of the present invention.

[0045] Explanation of reference numerals:

[0046] Stator 1

[0047] Pump shaft 2

[0048] Rotor 3

[0049] Bearing 4

[0050] Pump casing 5

[0051] Temperature sensor 6

[0052] Water flow sensor 7

[0053] Control module 8

[0054] Incoming line terminal 9

[0055] Humidity sensor 10

[0056] Microprocessor 11

[0057] Relay 12

[0058] Contactor 13

[0059] Frequency converter 14

[0060] Water pump 15

[0061] Power supply 16 Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. For the sake of description, spatial relative terms such as "above...", "above...", "on the upper surface of...", "above" and the like can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned "below other devices or structures" or "beneath other devices or structures" afterwards. Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used here.

[0063] Embodiment 1

[0064] As Figure 1 、 Figure 2 and Figure 3 shown, this embodiment discloses a water pump, which includes a stator 1, a pump shaft 2, a rotor 3, a bearing 4 and a pump housing 5. Further, it also includes a control module 8, a humidity sensor 10, an incoming line terminal 9 and a temperature sensor 6.

[0065] The control module 8 controls the power on and off of the water pump through circuit logic. The control module 8 can receive signals from the humidity sensor 10, the temperature sensor 6 and the water flow sensor 7, and issue command signals. The humidity sensor 10 is installed on the pump housing 5 and is electrically connected to the incoming line terminal 9, and is used to detect the relative humidity of the ambient air of the water pump and feedback it to the control module 8. The incoming line terminal 9 is electrically connected to the control module 8. The temperature sensor 6 is installed on the outer surface of the pump housing 5 and is electrically connected to the incoming line terminal 9. The temperature sensor 6 is threadedly connected to the water pump, or can also be fixed on the surface of the water pump by means of pasting. The water pump status monitoring device is installed on the pump housing 5 and is electrically connected to the incoming line terminal 9, and is used to monitor the operating state / operating speed of the water pump.

[0066] In this embodiment, the water pump status monitoring device is a water flow sensor 7, which is installed inside the water inlet of the water pump and is electrically connected to the incoming line terminal 9. The water flow sensor 7 detects the operating state / operating speed of the water pump through the Hall principle, but is not limited thereto, and it can also be a water flow sensor 7 using other principles. And the water flow sensor 7 transmits the signal to the control module 8 through a communication cable.

[0067] In this embodiment, the control module 8 includes a microprocessor 11, a relay 12, and a contactor 13. The microprocessor 11 is electrically connected to a humidity sensor 10, a temperature sensor 6, and a water flow sensor 7 through an incoming line terminal 9. The relay 12 is electrically connected to the microprocessor 11. The contactor 13 is electrically connected to a power supply for powering the water pump and the relay 12.

[0068] Embodiment 2

[0069] As Figure 1 and Figure 4 shown, the difference between this embodiment and Embodiment 1 is that:

[0070] In this embodiment, the water pump status monitoring device is a frequency converter 14, which is electrically connected to the incoming line terminal 9. The control module 8 obtains the operating status / operating speed of the water pump by reading the output signal of the frequency converter 14.

[0071] In this embodiment, the control module 8 includes a microprocessor 11 and a relay 12. The microprocessor 11 is electrically connected to a humidity sensor 10, a temperature sensor 6, and the frequency converter 14 through an incoming line terminal 9. The relay 12 is electrically connected to the microprocessor 11. The frequency converter 14 is electrically connected to a power supply for powering, the microprocessor 11, the relay 12, and the water pump.

[0072] The rest is the same as in Embodiment 1 and will not be elaborated here.

[0073] Embodiment 3

[0074] As Figure 5 shown, this embodiment discloses a method for preventing / eliminating internal condensate of the water pump, which is used to prevent internal condensate from being generated in the water pump in Embodiment 1 or Embodiment 2 or to eliminate the internal condensate that has already been generated in the water pump. The method includes the following steps:

[0075] S1. Detect the relative humidity of the ambient air of the water pump through the humidity sensor 10 and calculate the dew point temperature. Specifically, the dew point temperature can be calculated by the hygrometric method or by detecting the vapor pressure of the actual environment. Further, in order to ensure the accuracy of the structure, the dew point temperature can also be corrected and calculated according to the different atmospheric pressures at the installation location of the water pump.

[0076] S2. Detect the surface temperature of the water pump through the temperature sensor 6 and calculate the internal temperature of the water pump. Further, using the surface temperature or the internal temperature, a heat transfer model of the key internal components (stator 1, rotor 3, and bearing 4) of the water pump is established. According to the structural characteristics of the water pump and the heat transfer model, the possible internal condensation positions are calculated to determine one or more internal temperature calculation values.

[0077] S3. Monitor the operating status / operating speed of the water pump through the water pump status monitoring device;

[0078] S4. Compare the calculated value of the internal temperature with the corresponding dew point temperature. When the internal temperature is at or below the dew point temperature and the operating state / speed of the water pump is stopped / low speed operation, it is inferred that condensate is about to be generated or has already been generated. Further, when comparing the calculated value of the internal temperature with the corresponding dew point temperature, the calculation model takes the condensate formation time as a logical condition for the anti-condensation measure response. And, after inferring that condensate is about to be generated or has already been generated, the data calculation unit is used for signal collection and processing, and event storage. S5. Control the anti-condensation measure response to heat the inside of the water pump to prevent the generation of condensate / remove the generated condensate. More specifically, the inside of the water pump is heated by supplying a DC power supply or a single-phase power supply lacking a phase to the rotor 3 of the water pump.

[0079] It should be understood that although each step in the flowchart is numbered and shown sequentially according to the indication of the arrow, these steps are not necessarily executed sequentially according to the order indicated by the arrow. Unless there is a clear description in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the accompanying drawings may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0080] The water pump and the method for preventing / eliminating condensate inside the water pump according to the embodiments of the present invention can effectively prevent the formation or residue of condensate inside the water pump, thereby avoiding damage or malfunction of the water pump due to condensate, and further improving the quality of the water pump and the environmental application range of the water pump.

Claims

1. A water pump, comprising a stator, a pump shaft, a rotor, a bearing and a pump casing, characterized in that, It further includes: A control module that controls the power on and off of the water pump through circuit logic; An incoming line terminal electrically connected to the control module; A humidity sensor installed on the pump housing and electrically connected to the incoming line terminal; A temperature sensor installed on the outer surface of the pump housing and electrically connected to the incoming line terminal; A water pump status monitoring device installed on the pump housing and electrically connected to the incoming line terminal, for monitoring the operating status / operating speed of the water pump.

2. The water pump according to claim 1, characterized in that, The water pump status monitoring device is a water flow sensor, which is installed inside the water inlet of the water pump and electrically connected to the incoming line terminal. The water flow sensor detects the operating status / operating speed of the water pump and transmits the signal to the control module through a communication cable.

3. The water pump according to claim 1, characterized in that, The water pump status monitoring device is an inverter, which is electrically connected to the incoming line terminal. The control module obtains the operating status / operating speed of the water pump by reading the output signal of the inverter.

4. The water pump according to claim 2, characterized in that, The control module includes: A microprocessor electrically connected to the humidity sensor, the temperature sensor, and the water flow sensor through the incoming line terminal; A relay electrically connected to the microprocessor; A contactor electrically connecting the power supply, the water pump, and the relay.

5. The water pump according to claim 3, characterized in that, The control module includes: A microprocessor electrically connected to the humidity sensor, the temperature sensor, and the inverter through the incoming line terminal; A relay electrically connected to the microprocessor; The inverter is electrically connected to the power supply, the microprocessor, the relay, and the water pump.

6. A method for preventing / eliminating internal condensate water of a water pump, characterized in that, It is used to prevent / eliminate Except for the condensation water generated inside the water pump as described in any one of claims 1-5, the method includes the following steps Steps: Detect the relative humidity of the ambient air of the water pump through the humidity sensor and calculate the dew point temperature; Detect the surface temperature of the water pump through the temperature sensor and calculate the internal temperature of the water pump; Monitor the operating status / operating speed of the water pump through the water pump status monitoring device; Compare the calculated value of the internal temperature with the corresponding dew point temperature. When the internal temperature is at or below the dew point temperature and the operating status / operating speed of the water pump is in a stopped / low-speed operation state, it is inferred that condensation water is about to be generated or has already been generated; Control the response of the anti-condensation measure to heat the inside of the water pump to prevent the generation of condensation water / remove the generated condensation water.

7. The method according to claim 6, characterized in that, Calculate the dew point temperature through the dew point measurement method, and / or calculate the dew point temperature by detecting the actual ambient vapor pressure.

8. The method according to claim 6, characterized in that, Perform a correction calculation on the dew point temperature according to the different atmospheric pressures at the installation location of the water pump.

9. The method according to claim 6, characterized in that, Use the surface temperature or the internal temperature to establish a heat transfer model of the stator, the rotor, and the bearing.

10. The method according to claim 9, characterized in that, According to the structural characteristics of the water pump and the heat transfer model, calculate the possible internal condensation positions and determine one or more calculated values of the internal temperature.

11. The method according to claim 10, characterized in that, When comparing the calculated value of the internal temperature with the corresponding dew point temperature, the calculation model considers the condensation formation time as a logical condition for the response of the anti-condensation measure.

12. The method according to claim 11, characterized in that, After inferring that condensation water is about to be generated or has already been generated, use a data calculation unit to collect and process signals and store events.

13. The method according to claim 6, wherein Heat the inside of the water pump by supplying a DC power source or a single-phase power source lacking one phase to the rotor.

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