JP2020005342A - Control panel and pump device - Google Patents

Abstract

To provide a control panel capable of predicting the lifetime of an electrolytic capacitor in a simple configuration, and a pump device.SOLUTION: A control panel 14 comprises: a converter circuit 31 including an electrolytic capacitor 31a; a temperature detector 32a provided in an inverter circuit 32; and a control section 24 which calculates an average temperature Tduring a predetermined time (t) from temperatures detected by the temperature detector 32a, estimates a temperature Tof the electrolytic capacitor 31a during the predetermined time (t) from the average temperature T, and when a maximum rating temperature of the electrolytic capacitor 31a is defined as T, the specific lifetime that is the lifetime of the electrolytic capacitor 31a in the case where the electrolytic capacitor 31a is used at the maximum rating temperature Tis defined as Land the lifetime of the electrolytic capacitor 31a in the case where the temperature of the electrolytic capacitor 31a is the temperature Tis defined as L, calculates a consumption lifetime that is the lifetime consumed by the electrolytic capacitor 31a during the predetermined time (t) from the relationship expressed by L=(1/2)^((T-T)/10)×L.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a control panel having an inverter and a pump device.

  2. Description of the Related Art A technique using a pump device to supply water or the like in an apartment house or a building is known. Such a pump device controls the discharge pressure of the pump by, for example, controlling the motor at a variable speed by an inverter.

  The above-described pump device is regularly maintained. There is also known a feedwater pump control device that notifies a maintenance time by managing and displaying a service limit of a motor (for example, see Patent Document 1).

  Here, one of the components requiring maintenance is an electrolytic capacitor. The electrolytic capacitor is used in, for example, a smoothing circuit that smoothes DC power supplied to the above-described inverter in a control panel that controls driving of a motor.

Japanese Patent No. 3324794

  The life of the above-described electrolytic capacitor varies depending on the temperature during use. For this reason, a method of obtaining the temperature of the electrolytic capacitor can be considered for estimating the life. However, if a temperature detector is attached to the electrolytic capacitor as a method for obtaining the temperature of the electrolytic capacitor, the manufacturing cost of the pump device increases.

  Therefore, an object of the present invention is to provide a control panel and a pump device that can predict the life of an electrolytic capacitor with a simple configuration.

According to one embodiment of the present invention, the control panel detects a converter circuit having an electrolytic capacitor, an inverter circuit connected to the converter circuit, a temperature detector provided in the inverter circuit, and the temperature detector. An average temperature T ₀ at a predetermined time t is calculated from the temperature, a temperature _{Tc of the} electrolytic capacitor at the predetermined time t is estimated from the average temperature T ₀ , a maximum rated temperature of the electrolytic capacitor is set to T _max, and the maximum rated temperature is set to T _max. The specified life, which is the life of the electrolytic capacitor when the electrolytic capacitor was used at the temperature T _max , was L _max, and the life of the electrolytic capacitor when the temperature of the electrolytic capacitor was the temperature T _c was L _c . _{Occasionally,} the relationship represented by _{L c = (1/2) ^ (} (T c -T max) / 10) × L max, the plants And a control unit that calculates a consumption life is the life electrolytic capacitor has consumed at time t.

According to one aspect of the present invention, a pump device includes a pump, a motor driving the pump, an inverter having an electrolytic capacitor and a temperature detector, and an average temperature at a predetermined time t from a temperature detected by the temperature detector. T ₀ is calculated, the temperature T _{c of the} electrolytic capacitor at the predetermined time t is estimated from the average temperature T ₀ , the maximum rated temperature of the electrolytic capacitor is set to T _max, and the electrolytic capacitor is set at the maximum rated temperature T _max. when the life and is defined lifetime of the electrolytic capacitor when used as L _max, the life of the electrolytic capacitor when the temperature of the electrolytic capacitor is the temperature T _c was L _c, L _{c = (1} / ₂₎ ^ from the relationship expressed in _{((T c -T max) /} 10) × L max, it is the electrolytic capacitor in the predetermined time t vanishing It calculates the lifetimes, and a control unit for supplying electric power to the motor via the inverter.

  According to the present invention, it is possible to provide a control panel and a pump device that can predict the life of an electrolytic capacitor with a simple configuration.

The schematic diagram showing pump device 1 concerning one embodiment of the present invention.

  A pump device 1 according to one embodiment of the present invention will be described. FIG. 1 is a schematic diagram illustrating a configuration of the pump device 1.

  As shown in FIG. 1, the pump device 1 includes a pump 11, a motor 12, a rotating shaft 13, and a control panel 14. The pump device 1 is, for example, a water supply device connected to a water supply source such as a water receiving tank or a well and for pumping water to a secondary side.

  The pump 11 has a primary side connected to a water supply source and a secondary side connected to a water supply destination such as a building. The pump 11 includes a pump casing constituting a pump chamber, and an impeller fixed to the rotating shaft 13. The pump 11 increases the pressure of the water in the pump chamber as the impeller rotates in the pump chamber, and pumps the water to the secondary side.

  The motor 12 includes a motor casing, a stator fixed in the motor casing, and a rotor disposed in the motor casing and rotatably provided with respect to the stator. The motor 12 rotates the rotor when AC power is supplied.

  The rotating shaft 13 has a rotor fixed at one end and an impeller fixed at the other end. The rotating shaft 13 rotates the impeller as the rotor rotates.

  The control panel 14 includes an inverter 21, a notification unit 22, a storage unit 23, and a control unit 24. The control panel 14 is connected to a power supply. Here, the power supply is, for example, a commercial power supply provided in a building or the like, and supplies AC power to the control panel. The control panel 14 supplies AC power to the motor 12 and controls driving of the pump 11.

  The inverter 21 has a substrate and a plurality of electronic components arranged on the substrate, and a part of the substrate and the electronic components forms a converter circuit 31 and an inverter circuit 32. The inverter 21 rectifies the AC power supplied from the power supply into DC power by the converter circuit 31, smoothes the DC power, converts the DC power into AC power of an arbitrary frequency and voltage by the inverter circuit 32, and To supply.

  The converter circuit 31 has an electrolytic capacitor 31a as a part of an electronic component which is a component thereof. Converter circuit 31 includes, for example, a rectifier circuit and a smoothing circuit including electrolytic capacitor 31a. Converter circuit 31 rectifies AC power supplied from a power supply to DC power by a rectifier circuit. Further, converter circuit 31 smoothes the DC power with a smoothing circuit.

  The inverter circuit 32 has a temperature detector 32a as a part of an electronic component which is a component thereof. Inverter circuit 32 converts the DC power supplied from converter circuit 31 into AC power, and supplies AC power to motor 12. The temperature detector 32a is, for example, a thermistor arranged in the inverter circuit 32.

  The notification unit 22 is configured to be able to externally notify information on the life and replacement time of the electrolytic capacitor 31a. The notification unit 22 includes, for example, a display unit 22a that allows information to be visually recognized, a sound generation unit 22b that emits a warning sound, and a communication unit 22c that communicates with the outside.

  The display unit 22a includes, for example, a lamp, and notifies the replacement time of the electrolytic capacitor 31a by turning on and off the lamp. The display unit 22a has, for example, a liquid crystal display device, and is configured to be able to display each calculation result calculated by the control unit 24, and displays the life expectancy and replacement time of the electrolytic capacitor 31a. The display unit 22a may include both a lamp and a liquid crystal display device.

  The sound generator 22b is, for example, a buzzer or the like, and notifies a replacement time of the electrolytic capacitor to the outside by a warning sound.

  The communication unit 22c is configured to be connectable to a communication device such as a smartphone, a tablet, a personal computer, and a mobile phone by wired or wireless communication, and notifies the information regarding the life of the electrolytic capacitor 31a and the replacement time by the connected communication device.

  The notification unit 22 may have a configuration including only one or two of the display unit 22a, the sound generation unit 22b, and the communication unit 22c. The notification unit 22 can be appropriately designed as long as it can notify information of the life and replacement time of the electrolytic capacitor determined by the control unit 24.

Storage unit 23, a storage configured to allow integrated current supply time t ₁ and integrated operating time t _2. Cumulative energization time t ₁ is the integrated value of the time a current is passed to the control panel 14 from the power supply. Here, the accumulated energization time t ₁ is being energized with the control panel 14 from the power supply, including the time the inverter 21 is not driven. Integrated operating time t ₂ is the integrated value of time energizing the electrolytic capacitor 31a.

  The storage unit 23 stores various arithmetic programs executed by the control unit 24. The storage unit 23 is configured to be able to store various calculation results calculated by the control unit 24.

  Further, the storage unit 23 stores the relationship between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a. The relationship between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a is obtained by measuring the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a in advance, and deriving a correlation between these temperatures. Data.

  As a specific example, for the actual measurement of the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a, for example, an experimental device capable of actually measuring the temperature of the electrolytic capacitor 31a is used. The experimental apparatus is, for example, a control panel in which a temperature detector is separately provided on the electrolytic capacitor 31a in addition to the same configuration as the control panel 14.

  The correlation between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a may be, for example, a temperature detector provided in the electrolytic capacitor 31a and a temperature detector 32a derived from an actual measured value of the temperature of the temperature detector 32a. Is detected by the temperature detector provided in the electrolytic capacitor 31a. The storage unit 23 stores the correction formula as a relationship between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a.

  The correlation between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a is, for example, a table that records the measured value of the temperature of the electrolytic capacitor 31a corresponding to the measured value of the temperature of the temperature detector 32a. Is also good. In the case of this configuration, the storage unit 23 may previously store this table as a relationship between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a.

  Further, the storage unit 23 stores a predetermined time t, which is a period during which the control unit 24 performs a calculation regarding the life of the electrolytic capacitor 31a. The predetermined time t is set to, for example, one minute.

  The storage unit 23 stores a threshold. This threshold is used by the control unit 24 to determine when to replace the electrolytic capacitor 31a. The threshold is a predetermined time. This predetermined time is determined in consideration of, for example, the time required for the replacement operation, in addition to the time that can be replaced before the life of the electrolytic capacitor 31a.

The storage unit 23 stores a prescribed lifetime _{L max} of the maximum rated temperature _{T max} and the maximum rated temperature _{T max} when the electrolytic capacitor 31a of the electrolytic capacitor 31a. The maximum rated temperature T _max and the specified life L _max are specifications of the electrolytic capacitor 31a.

The control unit 24 controls the AC power supplied from the inverter 21 to the motor 12 based on information acquired from, for example, a pressure detector or a flow detector provided on the secondary side of the pump 11, thereby enabling the motor 12 to operate. Perform shift control. The control unit 24 calculates the cumulative energization time _{t 1} and integrated operating time _{t 2,} the storage unit 23. The control unit 24 determines whether a predetermined time t has elapsed. The lapse of the predetermined time t is determined while the electrolytic capacitor 31a is energized.

  Further, the control unit 24 has first to third functions. The first function is to estimate the temperature of the electrolytic capacitor 31a. The second function is a function of calculating the life and replacement time of the electrolytic capacitor 31a. The third function is a function of notifying the life and replacement time calculated by the second function. Hereinafter, the first to third functions will be specifically described.

The first function is to estimate the temperature of the electrolytic capacitor 31a. As a specific example of the first function, the control unit 24 calculates the temperature of the electrolytic capacitor 31a and the temperature detector 32a stored in the storage unit 23 from the temperature detected by the temperature detector 32a provided in the inverter circuit 32. Is used to estimate the temperature _Tc of the electrolytic capacitor 31a.

For example, the control unit 24 calculates an average temperature T ₀ , which is an average value of the temperatures detected by the temperature detector 32 a during the predetermined time t, and calculates the average temperature T ₀ using a correction formula stored in the storage unit 23. By performing the correction, the temperature _Tc of the electrolytic capacitor 31a during the predetermined time t is calculated. The control unit 24 stores the temperature _Tc in the storage unit 23 as the average temperature _Tc of the electrolytic capacitor 31a during the predetermined time t.

  The second function is a function of calculating the life and replacement time of the electrolytic capacitor 31a. As a specific example of the second function, the control unit 24 calculates the life of the electrolytic capacitor 31a using Arrhenius law and calculates the replacement time of the electrolytic capacitor 31a using the calculated life as described below. I do. The control unit 24 stores each calculation result in the storage unit 23.

For example, the control unit 24 first, which is the life of the electrolytic capacitor 31a to be consumed during a predetermined time t under the conditions of a temperature T _c, calculates a consumed lifetime L _u. Note that the consumption life _Lu is obtained by the following equations (1) to (3).

Maximum rated temperature of the electrolytic capacitor 31a is the average temperature T of the life of the electrolytic capacitor 31a of which is when a _c L _c, the average temperature T _c of the electrolytic capacitor 31a calculated by the first _function, stored in the storage unit 23 Assuming that the temperature is T _max and the specified life is L _max , from Arrhenius's law, the life L _c is

It is obtained from the equation.

  Further, as shown in Expression (2), α is

When defined as consumption life L _u of the electrolytic capacitor 31a life of the electrolytic capacitor 31a is on the assumption that the prescribed lifetime L _max, that is consumed during a predetermined time t under the conditions of a temperature T _c is formula ( 3).

Subsequently, the control unit 24, at every predetermined time t has elapsed, calculates the consumption life L _u, consumption life L _u by integrating a cumulative consumption life L electrolytic capacitor 31a is an integrating value of the lifetime consumption Calculate _i .

Specifically, the predetermined time t has passed n times, j-th temperature _{T c} of the electrolytic capacitor 31a calculated for (j = 1 to n) to a temperature _{T cj,} the predetermined time t under the conditions of a temperature _{T cj} when the life of the electrolytic capacitor 31a to be consumed was consumed lifetime L _uj between, by equation (4) alpha _j and an expression that defines the (5), calculates a consumption life L _uj like the consumed lifetime L _u it is, the accumulated energy lifetime L _i when a predetermined time t has passed n times is calculated by equation (6).

Subsequently, the control unit 24, as shown in Equation (7), defines the lifetime _{L max} by subtracting the accumulated consumption life _{L i} from the electrolytic capacitor 31a when the lifetime of the electrolytic capacitor 31a and defining life _{L max} to calculate the life expectancy _{L r.} The calculation of the life expectancy L _r is performed, for example, every predetermined time t elapses.

Incidentally, the life expectancy _{L r} calculated by the equation (7), a life expectancy when energized at a temperature _{T max} in the electrolytic capacitor 31a. In other words, life expectancy _{L r} is the time energizable under the conditions of the electrolytic capacitor 31a is temperature _{T max.}

Therefore, the control unit 24, the equation (8), the life expectancy L _r, as the ratio of the energization of the electrolytic capacitor 31a for the integrated current supply time t ₁ until now, the accumulated energization time storage unit 23 stores t ₁ by further multiplying the value obtained by dividing the integrated operating time t ₂ and the remaining time available power to the control panel 14 to the lifetime of the electrolytic capacitor 31a, calculates the energization enabling time L _e.

In the example of measuring the predetermined time t while energizing the electrolytic capacitor 31a, the elapsed time n × t the integrated operating time t ₂ when a predetermined time t has passed n times are equal. Therefore, in Equation (8), the integrated operating time t ₂ may be calculated energizable time by replacing the n × t L _e. According to this, the control unit 24 is able to calculate the current available time L _e without measuring an integrated operating time t _2.

  The third function is a function of notifying the information regarding the life of the electrolytic capacitor 31a calculated by the second function and notifying that the electrolytic capacitor 31a has been replaced by the third function by the notifying unit 22. .

As a specific example, the control unit 24, based on life expectancy L _r, it is determined whether the electrolytic capacitor 31a is time to replace. For example, the control unit 24 compares the life expectancy L _r, and a threshold value storage unit 23 stores, if below life expectancy L _r is a threshold, it is determined that the electrolytic capacitor 31a is the replacement time is approaching .

  When determining that the replacement time of the electrolytic capacitor 31a is approaching, the control unit 24 notifies the notification unit 22 that the replacement time of the electrolytic capacitor 31a is near.

  According to the pump device 1 configured as described above, the control unit 24 performs the life calculation process using Arrhenius's law using the estimated temperature of the electrolytic capacitor 31a, thereby reducing the life of the electrolytic capacitor 31a. Can be predicted. Further, based on the predicted life of the electrolytic capacitor 31a, the control unit 24 can determine the replacement time of the electrolytic capacitor 31a. In addition, the notification unit 22 can notify the life and replacement time of the electrolytic capacitor 31a.

  Thereby, the user of the pump device 1 can recognize the information on the life and replacement time of the electrolytic capacitor 31a, and can perform preventive maintenance such as replacing the electrolytic capacitor 31a before the life.

  The temperature of the electrolytic capacitor 31a is estimated from the temperature detected by the temperature detector 32a by experimentally acquiring the relationship between the temperature of the electrolytic capacitor 31a and the temperature detected by the temperature detector 32a included in the inverter circuit 32. can do. Then, using the estimated temperature of the electrolytic capacitor 31a, the calculation of the life of the electrolytic capacitor 31a and the timing of replacement can be determined by the arithmetic processing of the control unit 24.

  Accordingly, it is not necessary to separately provide a temperature detector for detecting the temperature of the electrolytic capacitor 31a, and the cost can be reduced.

Further, in this embodiment, it defines a predetermined time t, because it calculates the temperature T _c and consumption life L _u of the electrolytic capacitor 31a every predetermined time t, the electrolytic capacitor 31a in consideration of the temperature change life expectancy L _r it can be calculated, i.e., it is possible to calculate the life expectancy L _r of the electrolytic capacitor 31a with high accuracy.

  As described above, according to the pump device 1 according to one embodiment, the life of the electrolytic capacitor 31a can be predicted with a simple configuration.

In the present embodiment, the temperature _Tc of the electrolytic capacitor 31a is calculated as the average temperature during the predetermined time t, and the life expectancy _Lr is calculated based on the temperature _Tc . Here, the temperature T _c, since calculating the average temperature T _c at a predetermined time t, when set short predetermined time t, to improve the accuracy of the temperature T _c for the actual temperature of the temperature T _c electrolytic capacitors 31a Can be. Therefore, setting a shorter predetermined time t, it is possible to improve the accuracy of the life expectancy L _r is calculated.

In the present embodiment, the control unit 24 has been described an exemplary procedure for determining the replacement time based on the life expectancy L _r, but is not limited thereto.

For example, in Equation _(1), place the place _{L r} to _{L max, L c} is calculated by placing a temperature _{T ave} is the average value of the temperature _{T cj} calculated for each place a predetermined time t elapses _{T c} is Hereafter, it is the remaining life _Lcr when it is assumed that the electrolytic capacitor 31a is used at the temperature T _ave . The control unit 24 may determine the replacement time by comparing the life expectancy _Lcr with a threshold value.

Further, in equation (8), by placing the corrected life expectancy L _cr in place of the life expectancy L _r , the energizable time L _ce can be calculated when it is assumed that the electrolytic capacitor 31a is used at the temperature T _ave thereafter. .

Further, the notification unit 22, in addition to the life expectancy _{L r} and energizable time _{L e,} the thus calculated life expectancy _{L cr} and energizable time _{L ce} may be notified. According to this, the user can recognize the life expectancy and the replacement time of the electrolytic capacitor 31a according to the expected use situation.

  The present invention is not limited to the above-described embodiment, and can be variously modified in an implementation stage without departing from the gist of the invention. In addition, the embodiments may be combined as appropriate, and in that case, the combined effect is obtained. Furthermore, the above-described embodiment includes various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent features. For example, even if some components are deleted from all the components shown in the embodiment, if the problem can be solved and an effect can be obtained, a configuration from which the components are deleted can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 1 ... Pump apparatus, 11 ... Pump, 12 ... Motor, 13 ... Rotating shaft, 14 ... Control panel, 21 ... Inverter, 22 ... Notification part, 22a ... Display part, 22b ... Sounding part, 22c ... Communication part, 23 ... Storage Unit, 24 control unit, 31 converter circuit, 31a electrolytic capacitor, 32 inverter circuit, 32a temperature detector.

Claims (10)

A converter circuit having an electrolytic capacitor;
An inverter circuit connected to the converter circuit;
A temperature detector provided in the inverter circuit;
The calculated from the temperature detected by the temperature detector the average temperature T ₀ at a predetermined time t, and the estimated temperature T _c of the electrolytic capacitor in the predetermined time t from the average temperature T _0, the maximum rated temperature of the electrolytic capacitor T _max , the specified life that is the life of the electrolytic capacitor when the electrolytic capacitor is used at the maximum rated temperature T _max is L _max , and the electrolytic capacitor when the temperature of the electrolytic capacitor is the temperature _Tc the lifetime is taken as _{L c, L c = (1/2} ) ^ ((T c -T max) / 10) × from the relationship expressed in _{L max,} the electrolytic capacitor is consumed in the predetermined time t A control unit for calculating a consumption life, which is a reduced life,
Control panel equipped with   The control unit calculates the consumption life every time the predetermined time t elapses, and calculates the integrated consumption life which is an integrated value of the life consumed by the electrolytic capacitor by integrating the consumption life. 2. The control panel according to 1.   The control panel according to claim 2, wherein the control unit determines whether it is time to replace the electrolytic capacitor based on the accumulated life. Has a notification unit,
4. The control panel according to claim 3, wherein the control unit issues a notification by the notification unit when determining that the electrolytic capacitor is at the replacement time. 5.   The said notification part is at least one of the display part which can visually recognize information, the sounding part which alert | reports information by sound, and the communication part which transmits information to the connected communication terminal. control panel. Pump and
A motor for driving the pump;
An inverter having an electrolytic capacitor and a temperature detector;
The calculated from the temperature detected by the temperature detector the average temperature T ₀ at a predetermined time t, and the estimated temperature T _c of the electrolytic capacitor in the predetermined time t from the average temperature T _0, the maximum rated temperature of the electrolytic capacitor T _max , the specified life that is the life of the electrolytic capacitor when the electrolytic capacitor is used at the maximum rated temperature T _max is L _max , and the electrolytic capacitor when the temperature of the electrolytic capacitor is the temperature _Tc the lifetime is taken as _{L c, L c = (1/2} ) ^ ((T c -T max) / 10) × from the relationship expressed in _{L max,} the electrolytic capacitor is consumed in the predetermined time t A control unit that supplies power to the motor via the inverter;
A pump device comprising:   The control unit calculates the consumption life every time the predetermined time t elapses, and calculates the integrated consumption life which is an integrated value of the life consumed by the electrolytic capacitor by integrating the consumption life. 7. The pump device according to 6.   The pump device according to claim 7, wherein the control unit determines whether it is time to replace the electrolytic capacitor based on the accumulated life. Has a notification unit,
9. The pump device according to claim 8, wherein the control unit notifies the notification unit when it determines that the electrolytic capacitor is at the replacement time. 10.   The said notification part is at least any one of the display part which can visually recognize information, the sounding part which notifies information by sound, and the communication part which transmits information to the connected communication terminal. Pump device.