JP2010242521A - Pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pump which prevents the complication of an internal structure and manufacturing process and the enlargement of a body size, and which can determine pump service life. <P>SOLUTION: The pump 1 consists of a rotor 3 equipped with a magnet 31, an impeller 5 fixed to one end in an axial direction of a rotary shaft 12 of the rotor 3, a stator 2 equipped with teeth having a coil wound therearound and a circuit part 4 equipped with a control part 41 for performing energization control of the stator 2. While a magnetic force detection part 6 for detecting magnetic force of the rotor 3 is provided to a side of an end of the magnet 31 in an axial direction of the rotary shaft 12 in the rotor 3, a determination part 43 for determining whether or not the pump reaches service life from detected information from the magnetic force detection part 6 is provided to the circuit part 4. By so doing, the determination of pump service life can easily be made with a simple structure. As a result, the complication of the manufacturing process and internal structure and the enlargement of a body size can be suppressed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to the detection of pump life associated with wear of a pump, particularly a rotating part provided in the pump.

  For example, as shown in FIG. 10, the conventional pump 1 includes an impeller 5 that sucks and discharges liquid and gas as the rotor 3 rotates, a stator 2 that includes teeth wound with coils, and a circuit unit that includes electronic components. 4 and.

  The rotor 3 rotates around the axis of the rotation shaft 12 that is the center of rotation via the bearing 13, and when the rotor 3 rotates, thrust is generated along the axial direction of the rotation shaft 12 by the rotation of the impeller 5. The generated thrust was applied to the rotor 3 and the bearing 13.

  Therefore, the bearing 13 biased by the thrust and the receiving plate 15 that holds the bearing 13 are slid to cause wear at the contact portion of the bearing 13 with the receiving plate 15.

  As the wear progresses, the runout of the rotor 3 increases, the rotation becomes unstable, the pump performance decreases, and the rotor 3 comes into contact with the stator 2 and the casing 11 of the pump 1 and is damaged. This was a problem.

  Therefore, in order to prevent the pump from being used in a state where the pump performance is deteriorated or malfunctions, it has been required to determine the pump life by detecting the wear of the rotating parts.

  As for determining the pump life, for example, as shown in Patent Document 1, there is a gas compressor that determines the pump life from a change in flow rate at which gas sucked and discharged by a turbo blade leaks from a gas compression chamber through a seal mechanism. there were.

  This is because the swirling of the shaft increases with the backlash due to wear of rolling bearings, etc., and the clearance of the seal mechanism provided on the shaft widens, and the flow rate of gas leaking from the gas compression chamber through the seal mechanism This is an increase in the use of

  Then, the flow rate of the leaking gas is detected by a flow sensor, and when the detected leakage amount increases to a predetermined value or more, it is determined that the life of the rolling bearing is approaching.

  Further, as shown in Patent Document 2, there is a case where the wear of a part is detected from the flow rate of the case drain of the pump case or the rate of change of the flow rate, and when the detected wear exceeds a predetermined level, the pump life is determined.

  In this method, the flow rate of the fluid sucked and discharged by the pump is measured by a flow sensor, and the processor compares the measured flow rate with a predetermined constant, and determines that the pump life is exceeded if the predetermined flow rate is exceeded.

  Reference numeral 16 in FIG. 10 of the above-described conventional example is a cylindrical separation plate that isolates the stator 2 from the rotor 3 and the fluid. The stator 2 and the circuit unit 4 are fixed to the separation plate 16 by molding. Reference numerals 14 positioned near both ends of the rotating shaft 12 are shaft fixing portions for fixing and holding each axial end of the rotating shaft 12 to the casing 11 or the separation plate 16.

Japanese Patent Laid-Open No. 11-351185 JP 7-280688 A

  However, since both Patent Document 1 and Patent Document 2 determine the pump life from the flow rate, the accuracy is low only with the flow sensor and the processor, and a large number of pressure sensors, temperature sensors, etc. It was necessary to provide parts.

  In other words, in the prior art, in order to accurately determine the pump life, the internal parts are increased and the structure of wiring and the like is complicated, and there is a problem that the pump becomes larger and the production process and production cost increase. there were.

  Therefore, the present invention was invented in view of the above circumstances, and a pump capable of determining the pump life without reducing the accuracy of determination, suppressing the complication of the internal structure, the enlargement of the pump, and the increase in production cost. It was an issue to provide.

  In order to solve the above problems, the pump 1 of the present invention includes a rotor 3 having a magnet 31, an impeller 5 fixed to one end in the axial direction of the rotating shaft 12 of the rotor 3, and a tooth wound with a coil. And a circuit unit 4 including a control unit 41 that controls energization of the stator 2. A magnetic force detection unit 6 for detecting the magnetic force of the rotor 3 is provided on the side of the end of the magnet 31 in the axial direction of the rotary shaft 12 of the rotor 3, and the pump life is determined from the detection information of the magnetic force detection unit 6 in the circuit unit 4. It is characterized in that a determination unit 43 is provided for determining whether or not it has reached.

  With such a configuration, the pump life can be determined because the determination unit 43 can determine the pump life from the change in magnetic force detected by the magnetic force detection unit 6 according to the wear state of the rotating part such as the bearing 13 of the rotor 3. Therefore, it is possible to suppress the number and types of detection units to be used.

  The invention according to claim 2 is characterized in that the magnetic force detection unit 6 is provided on the side of the end portion opposite to the side where the impeller 5 is fixed to the rotor 3.

  In the invention according to claim 3, the rotation detecting unit 7 for detecting the magnetic pole position of the rotor 3 and performing the rotation control of the rotor 3 is arranged along the axial direction of the rotating shaft 12 of the magnetic force detecting unit 6 and the stator 2. It is characterized by being placed between.

  The invention according to claim 4 is characterized in that the magnetic force detector 6 also serves as the rotation detector 7 that detects the magnetic pole position of the rotor 3.

  The invention according to claim 5 is characterized in that when the determination unit 43 determines that the pump life is reached, the circuit unit 4 performs control to stop energization of the stator 2.

  As described above, since the pump of the present invention can determine the pump life due to wear of the rotating part by the magnetic force detection unit, the determination unit can reduce the number and types of detection units for determining the pump life, The increase in size of the internal structure can be suppressed. And since there is only one type of detector for determining the pump life, it is possible to prevent complications due to complication of internal structure and diversification of production processes, suppressing an increase in production time, and reducing production costs. be able to.

  In addition, by providing the magnetic force detection unit on the side of the end opposite to the side on which the impeller is fixed to the rotor, the rotating part due to the thrust generated during rotation pulling the rotor toward the impeller side It is preferable that it can cope with the detection of the wear state of the.

  In addition, by providing a rotation detection unit on the stator side from the magnetic force detection unit, even if the rotation part is worn, the rotation detection unit can stably detect the magnetic pole position until it is determined that the pump life is reached. .

  Further, it is preferable that the magnetic force detection unit also serves as the rotation detection unit, so that the internal structure can be simplified and the production cost can be further reduced.

  In addition, the circuit unit stops energizing the stator when it is determined that the pump has reached the end of its life, so that the rotor does not rotate during the life of the pump. It can improve and is preferable.

It is explanatory drawing of the initial state of the pump of Embodiment 1 of this invention. It is explanatory drawing of the state with which the bearing determined to be a pump lifetime same as the above was worn out. It is a block diagram regarding the circuit part and detection part of a pump same as the above. It is a flowchart of the determination process of a pump lifetime same as the above. It is explanatory drawing of the initial state of the pump of Embodiment 2. It is explanatory drawing of the state with which the bearing determined to be a pump lifetime same as the above was worn out. It is a block diagram regarding the circuit part and detection part of a pump same as the above. It is a block diagram regarding the circuit part and detection part of the pump of Embodiment 3. It is a flowchart of the determination process of a pump lifetime same as the above. It is explanatory drawing of the pump of a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same structure as the content demonstrated in the prior art example using the above-mentioned FIG. The features are described below.

  In the pump 1 according to the first embodiment of the present invention, as illustrated in FIG. 1-4, the rotor 3 is disposed on the inner circumferential side of the separation plate 16, and the stator 2 is disposed on the outer circumferential side of the cylinder.

  The outer peripheral portion 32 of the magnet 31 of the rotor 3 and the inner peripheral portion of the teeth of the stator 2 face each other along the radial direction with the separation plate 16 interposed therebetween.

  The impeller 5 rotated by the rotor 3 is positioned outward from the separation plate 16 in the axial direction, and the thrust generated in the impeller 5 by the rotation causes the rotor 3 to move along the axial direction. It is a direction that pulls to the side.

  That is, when the impeller 5 rotates with the rotation of the rotor 3, the rotor 3 and the impeller 5 are attracted toward the outer side on the impeller 5 side along the axial direction of the rotary shaft 12 by being biased by the generated thrust. It is done.

  Of the receiving plate 15, the receiving plate 15 disposed on the impeller 5 side of the bearing 13 and the end portion of the bearing 13 on the impeller 5 side slide to contact the receiving plate 15 of the bearing 13. Wear is caused at the end.

  Further, the side of the separating plate 16 located opposite to the impeller 5 is a bottom portion 17, and the circuit portion 4 is arranged to face the bottom portion 17 outward from the bottom portion 17 along the axial direction. Yes.

  The stator 2, the rotation detection unit 7 that detects the rotation of the rotor 3, and the magnetic force detection unit 6 that detects the displacement of the rotor 3 due to the wear are electrically connected to the facing surface of the circuit unit 4. Connected.

  Furthermore, on the back side of the opposite surface of the circuit unit 4, a control unit 41 that controls energization of the stator 2 and an external connector 44 that is exposed to the outside and electrically connects the circuit unit 4 and the outside are disposed. Has been.

  Specifically, the rotation detection unit 7 and the magnetic detection unit 6 are attached to a holder 45 projecting from the circuit unit 4 toward the stator 2 side by side in the axial direction. The position is closer to the stator 2 than the detection unit 6.

  The rotation detector 7 has a detection surface 71 opposed to the outer peripheral portion 32 of the magnet 31.

  That is, the rotation detection unit 7 detects the magnetic pole position from the magnetic flux generated between the stator 2 and the rotor 3 from the magnetic flux flowing on the detection surface 71 based on the polarity and strength of the magnetic force of the rotor 3, and the circuit unit 4. The detection signal is output to the control unit 41 via the.

  And the said control part 41 judges the rotation condition of the rotor 3 based on the input detection signal, and controls the coil energization of the stator 2, thereby rotating the rotor 3 stably and causing variations in pump performance. To prevent that.

  The magnetic force detection unit 6 is located on the outer periphery of the end portion on the bottom 17 side of the separation plate 16 positioned opposite to the impeller 5 of the rotation shaft 12, and on the bottom 17 side along the axial direction of the rotation shaft 12. The end of the magnet 31 positioned and the magnetic force detection unit 6 are arranged in the radial direction.

  And the detection surface 61 of the said magnetic force detection part 6 is arrange | positioned at the side of the edge part by the side of the bottom 17 of the separation plate 16 in the axial direction of the rotating shaft 12 of the rotor 3 toward the rotation center of the rotor 3, The detection surface 61 is opposed to the outer peripheral portion 32 of the magnet 31.

  That is, assuming that the direction in which the bearing 13 moves by the thrust is the front, the end of the magnet 31 on the impeller 5 side is the front end, the other end is the rear end, and the magnetic force detection unit 6 sets the detection surface 61 to the outer peripheral portion 32 of the magnet 31. It is arranged toward the part near the rear end.

  And the magnetic force detection part 6 is a Hall element, for example, detects the magnetic force level of the magnetic flux which flowed through the detection surface 61 among the magnetic fluxes generated between the stator 2 and the rotor 3, and outputs the detected magnetic force level to the output voltage. Is output as

  The output voltage output is amplified by the signal amplifying unit 42 provided in the circuit unit 4 and then output to the determining unit 43. The output voltage amplified by the determining unit 43 and the reference voltage value stored in advance are By comparing these, it is determined whether or not the pump has a lifetime due to wear.

  The determination of the pump life by the determination unit 43 is a comparison determination as to whether or not the amplified output voltage exceeds the reference voltage value. If it is determined that the output voltage is less than or equal to the reference voltage value, wear has progressed. If the pump has reached the end of its life, it will be judged.

  The reference voltage value is calculated by adding a predetermined safety factor to the expected output voltage detected when a malfunction occurs in the pump 1, and this is the pump life before the malfunction occurs in the pump 1. The occurrence of an accident due to a malfunction of the pump 1 is prevented.

  That is, when the bearing 13 is worn, the position of the rotor 3 is shifted to the impeller 5 side, so that the magnetic force level of the magnetic flux detected by the detection surface 61 of the magnetic force detection unit 6 is lowered and is a detection result of the magnetic force detection unit 6. The output voltage is also lower than the initial state before wear.

  As the wear of the bearing 13 progresses and the detection surface 61 of the magnetic force detection unit 6 and the end of the magnet 31 are separated by a predetermined amount in the axial direction as shown in FIG. 2, the output voltage is substantially equal to the reference voltage value. The determination unit 43 determines that the pump life is the same or less than the reference voltage value.

  When the pump life is determined by the comparison determination, a life signal is output from the determination unit 43 to the control unit 41. When the control unit 41 receives the life signal, the energization to the stator 2 is stopped and the pump 1 is stopped. Let

  That is, when a life signal is output from the determination unit 43, the control unit 41 stops driving the pump 1 determined to have a pump life and prohibits the use of the pump 1. Thus, the pump 1 is improved in safety.

  At this time, since the rotation of the pump 1 is also unstable, the control unit 41 prohibits the use of the pump 1 in a state where the rotation cannot be stably performed.

  Therefore, by providing the detection surface 61 of the magnetic force detection unit 6 so as to oppose the outer peripheral portion 32 at the end opposite to the impeller 5 of the magnet 31, the wear of the bearing 13 of the rotor 3 by one magnetic force detection unit 6. The pump 1 can detect the situation.

  Since the change in the magnetic force level detected by the magnetic force detection unit 6 is the displacement of the rotor 3 due to the wear of the bearing 13, the change directly influenced by the wear state of the bearing 13 is detected.

  Therefore, the detection information corresponding to the progress of the wear of the bearing 13 is obtained, and the pump 1 can accurately determine the pump life due to the wear of the bearing 13.

  Furthermore, since the pump life can be determined by the magnetic force detection unit 6, the signal amplification unit 42, and the determination unit 43, the structure for determining the life can be simplified without reducing the determination accuracy, and the pump 1 can be enlarged. It is possible to suppress the production cost.

  Further, since the magnetic force detection unit 6 is attached to the holder 45 that holds and fixes the rotation detection unit 7 to the circuit unit 4, it is not necessary to separately provide an attachment part for the magnetic force detection unit 6, and the manufacturing process required for the magnetic force detection unit 6. Can be suppressed, and the production cost can be reduced.

  And since the rotation detection part 7 was attached to the position close | similar to the impeller 5 side along an axial direction from the magnetic force detection part 6, even if abrasion generate | occur | produces in the bearing 13, until the magnetic force detection part 6 detects a lifetime, a rotation detection part 7 and the outer peripheral portion 32 of the magnet 31 can be kept opposite to each other.

  That is, since the rotation detection unit 7 and the magnet 31 are kept facing each other until the end of the service life, it is possible to prevent a failure in the detection signal of the rotation detection unit 7 before the service life, and the pump performance is stable until the service life is reached. It becomes the pump 1 which does.

  It should be noted that the detection of the magnetic force level by the magnetic force detection unit 6 may be performed after a predetermined time has elapsed after the pump 1 is started, which is preferable because it can prevent determination with an unstable magnetic flux at the initial stage of rotor rotation.

  The rotation detection unit 7 and the magnetic force detection unit 6 may be arranged in a circumferential gap between the teeth, and the detection units and the stator 2 may be arranged on the same circumference. The axial dimension of the pump 1 can be made substantially the same as that of the stator 2, and the pump 1 can be downsized.

  Of course, in the pump 1 of the present invention, the rotor 3 is positioned on the outer periphery of the separation plate 16 and the stator 2 is positioned on the inner periphery, or the rotor 3 is formed with a coil and the end of the coil in the axial direction of the rotary shaft 12 You may arrange | position the magnetic force detection part 6 to the side.

  Moreover, as Embodiment 2, an example in which the magnetic force detection unit 6 also serves as the rotation detection unit 7 will be described as illustrated in FIGS. In addition, the same code | symbol is attached | subjected to the structure same as the content demonstrated in the above-mentioned prior art example or an Example, description is abbreviate | omitted, and the characteristic of a present Example is described below.

  In this example, by outputting the output voltage of the magnetic force detector 6 to the signal amplifier 42 and the controller 41, the magnetic force detector 6 also serves as the rotation detector 7.

  Therefore, it is not necessary to make a large arrangement space, and the dimension along the axial direction of the magnet 31 can be reduced, and the pump 1 is further downsized.

  And since the detection part became one, while being able to simplify the internal structure of the pump 1, production cost can be reduced.

  Further, as the third embodiment, an example in which the determination unit 43 outputs the determination result to the external connector 44 as illustrated in FIGS. 8 and 9 will be described. In addition, the same code | symbol is attached | subjected to the structure same as the content demonstrated in the above-mentioned prior art example or an Example, description is abbreviate | omitted, and the characteristic of a present Example is described below.

  The determination unit 43 outputs a life signal to the external connector 44, and the life signal is output to an external device electrically connected to the external connector 44.

  For example, when a notification unit is connected to the external connector 44, the notification unit notifies the user of the life of the pump 1 by display or sound based on the life signal, and can easily notify the user of the pump life. .

  Of course, even if the determination unit 43 outputs a life signal to both the external connector 44 and the control unit 41, both the stop by the control unit 41 and the operation by the external device connected to the external connector 44 are performed. Good.

  In each embodiment, if the determination unit 43 outputs the difference between the output voltage and the reference voltage value to the control unit 41 or the external connector 44 in addition to the life signal at the time of life, It is also possible to calculate the expected operation time until the pump life is reached.

DESCRIPTION OF SYMBOLS 1 Pump 11 Casing 12 Rotating shaft 13 Bearing 14 Shaft fixing | fixed part 15 Receiving plate 16 Separation plate 17 Bottom part 2 Stator 3 Rotor 31 Magnet 4 Circuit part 41 Control part 42 Signal amplification part 43 Determination part 44 External connector 45 Holder 5 Impeller 6 Magnetic force Detector 7 Rotation detector

Claims (5)

  A rotor provided with a magnet, an impeller fixed to one end in the axial direction of the rotating shaft of the rotor, a stator provided with a coil-wrapped tooth, and a circuit unit provided with a control unit for controlling energization of the stator; The magnetic force detection unit for detecting the magnetic force of the rotor is provided on the side of the end of the magnet in the axial direction of the rotation axis of the rotor, and the detection information of the magnetic force detection unit is provided in the circuit unit. A pump comprising a determination unit for determining whether or not the pump life has been reached.   2. The pump according to claim 1, wherein the magnetic force detection unit is provided on a side of an end portion opposite to a side where the impeller is fixed to the rotor.   A rotation detector for detecting the magnetic pole position of the rotor and controlling the rotation of the rotor is disposed between the magnetic force detector and the stator along the axial direction of the rotation shaft. The pump according to claim 1 or 2.   The pump according to claim 1, wherein the magnetic force detection unit also serves as a rotation detection unit that detects a magnetic pole position of the rotor.   5. The pump according to claim 1, wherein when the determination unit determines that the pump life is reached, the circuit unit performs control to stop energization of the stator.

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