JP6078791B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner used in a general household.

  As a means for suppressing the heat generation of a motor and electronic components incorporated in a conventional vacuum cleaner, a method using suction air for sucking dust is common. Therefore, if a large amount of dust sucked from the suction port accumulates in the dust collection chamber or the suction port is blocked and the suction air volume is reduced, a sufficient cooling effect cannot be obtained. When a decrease in the suction air volume is detected as in the vacuum cleaner described in 1), control is performed so as to suppress the heat generation of the motor and electronic components by reducing the energization amount to the motor. Incidentally, as the suction air volume detection means, a method of indirectly detecting the suction air volume by using current detection means for detecting the current flowing through the motor is mainly used.

JP-A-11-146856

  At the time of normal use, there is no problem with the conventional vacuum cleaner at all, but the conventional vacuum cleaner has the following problems when performing futon compression using the futon compression bag.

  In other words, if air is sucked from the futon compression bag and the futon is compressed, the suction air flow becomes very low, and the control immediately lowers the motor's energization rate, causing the air to flow backward into the futon compression bag, Since the degree of vacuum in the compression bag cannot be maintained, sufficient futon compression cannot be performed. For this reason, there are many cases in which suction from a futon compression bag is repeatedly performed over a long period of time. There was also a problem of being connected.

  This invention solves the said conventional subject, and it aims at providing the vacuum cleaner which can perform the futon compression by the futon compression bag without a problem.

  In order to solve the above-described conventional problems, the vacuum cleaner of the present invention includes a vacuum cleaner body including an electric blower that generates suction air, a suction port for sucking dust on a surface to be cleaned, and trapped dust. A dust collection chamber for collecting, an outside air inlet for introducing outside air to the electric blower, a current detection means for detecting a current flowing through the electric blower, and the suction from the intake side of the electric blower via the dust collection chamber A path switching means capable of selectively switching between a first intake path communicating with the mouth and a second intake path communicating with the outside air intake without passing through the dust collecting chamber from the intake side of the electric blower And normally operating in the first intake path, and when the state where the current value detected by the current detection means is less than a first predetermined value continues for a first predetermined time, the first For example, the front If the first predetermined value is set to be approximately the same as the current value when the suction air flowing into the electric blower is substantially zero, the second air intake path is switched to the second intake path after sufficiently compressing the futon compression bag. The air does not flow backward, the vacuum state in the futon compression bag is maintained, and the electric blower and electronic parts are rapidly cooled by the suction of the outside air. Therefore, the futon compression by the futon compression bag can be performed without any problem, and the reliability by the overtemperature protection is improved.

  The electric vacuum cleaner of the present invention can provide a user-friendly electric vacuum cleaner that can be comfortably compressed by a futon compression bag and that is improved in reliability by over-temperature protection.

Whole perspective view of the electric vacuum cleaner in Embodiment 1 of this invention Circuit block diagram of the vacuum cleaner Control flowchart of the vacuum cleaner

  The first invention includes a vacuum cleaner body including an electric blower for generating suction air, a suction port for sucking dust on a surface to be cleaned, a dust collecting chamber for collecting sucked dust, and the electric blower. An outside air inlet for introducing outside air; current detection means for detecting a current flowing through the electric blower; a first intake path communicating with the suction port from the intake side of the electric blower via the dust collection chamber; Path switching means capable of selectively switching from the intake side of the electric blower to the second intake path communicating with the outside air inlet without passing through the dust collecting chamber, and normally the first intake air When the state where the current value detected by the current detection means is less than a first predetermined value continues for a first predetermined time, the operation is switched to the second intake path, for example, The first predetermined value flows to the electric blower If the suction air is set to approximately the same value as the current when the suction air is substantially zero, the air is not backflowed into the futon compression bag because it is switched to the second intake path after sufficient futon compression. The state where the degree of vacuum in the compression bag is maintained is maintained, and the electric blower and the electronic parts are rapidly cooled by sucking outside air. Therefore, the futon compression by the futon compression bag can be performed without any problem, and the reliability by the overtemperature protection is improved.

  In the second invention, in particular, during operation in the first intake path of the first invention, the state where the current value detected by the current detection means is less than the second predetermined value is longer than the first predetermined time. When the electric current is supplied to the electric blower for a long second predetermined time, for example, the second predetermined value is set to the current value when the dust collecting chamber is full of dust. By setting the second predetermined time to an appropriate time, and maintaining the effect of the first invention, the state where the cooling air is reduced due to the fullness of dust is set. Since the amount of energization can be reduced when the operation is continued for a long time, it is possible to suppress a useless temperature rise of the electric blower and the electronic components, and further improve the reliability.

  In particular, the third invention includes a circuit board that controls the electric blower or the like of the first or second invention, and a temperature detection means that detects the temperature of the electric blower or the vicinity of the circuit board, and is detected by the temperature detection means. When the measured temperature is equal to or higher than the predetermined temperature, the second intake path is switched, and immediately before the overtemperature prevention control described in the first and second inventions operates, Even when the temperature rise of the electric blower or the electronic component cannot be suppressed, such as when the closed air bag is repeatedly opened, cooling can be performed by switching to the second intake path, which further improves the reliability. .

The fourth aspect of the invention is provided with an informing means for notifying that when switching to the second intake passage of any one of the first to third aspects of the invention, and that the futon compression has been completed. It also has a role to inform. Only the control according to claims 1 to 4 is performed, and a vacuum cleaner that is easy to use can be provided.

According to a fifth aspect of the invention, in particular, the electric vacuum cleaner according to any one of the first to fourth aspects includes a plurality of operation modes including a futon compression operation mode for using a futon compression bag, and the user performs the operation described above. Provided with an operation means for switching the mode, and the control according to claims 1 to 4 is performed only when the operation mode for futon compression is selected. can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is an overall perspective view of the electric vacuum cleaner according to Embodiment 1 of the present invention, FIG. 2 is a circuit block diagram of the electric vacuum cleaner, and FIG. 3 is a control flowchart of the electric vacuum cleaner.

  In FIG. 1, the vacuum cleaner main body 21 of the vacuum cleaner according to the present embodiment has an electric blower chamber 22 containing the electric blower 2 at the rear, and a dust collection chamber 23 for collecting dust at the front. In addition, an air inlet 26 is provided at the front portion of the cleaner body 21 to which a connection pipe 25 provided at one end of the hose 24 is detachably connected. An intake port (not shown) of the electric blower 2 communicates with a first intake passage 35 that communicates with the dust collection chamber 23 and an outside air intake 34 that is disposed on the top surface of the cleaner body 21. A second intake path 36 is provided, and the first intake path 36 and the second intake path 36 are provided by the air path switching valve 11 serving as a path switching unit disposed at a junction of the first intake path 35 and the second intake path 36. The second intake paths 35 and 36 can be alternatively switched.

  The other end of the hose 24 is provided with a tip pipe 28 having a handle 27 having an operation means 9 and a display means 6 for gripping during cleaning and operating the cleaner body 21. The operation means 9 includes an “off” button (not shown), an “run” button (not shown), and a “futon compression” button (not shown). , A “dust full” lamp (not shown) and a “cooling” lamp (not shown).

  The downstream end of the extendable extension tube 29 is detachably connected to the tip pipe 28, and the other end is detachably connected to a suction tool 31 having a suction port 33 on the bottom surface. Under the suction tool 31, a rotating brush 30 for scraping dust is disposed, and a motor 10 that rotationally drives the rotating brush 30 is incorporated. A power cord 13 is connected to an outlet (commercial power supply 1) (described later) at the rear of the cleaner body 21 to supply power to a circuit board 32 (described later) built in the cleaner body 21. (Described later) is provided.

  Next, the control circuit configuration of the vacuum cleaner in the present embodiment will be described with reference to FIG. Each block 32a, 32b, and 32c of the circuit board 32 is arranged on the cleaner body 21, the hose 24, and the suction tool 31, respectively.

  The commercial power supply 1 includes a zero-cross detection circuit 8 for detecting a zero-cross of a power supply waveform, a power supply circuit 7 for supplying power to the signal control means 14, an electric blower 2, a motor 10, and an air path switching valve. 11 is connected. The electric blower 2 and the motor 10 are configured to be phase-controlled by the signal control means 14 via a drive circuit A4 and a drive circuit B12, respectively. The zero cross detection circuit 8 required for performing phase control is connected to the signal control means 14. Further, the air path switching valve 11 is configured to be controlled by the signal control means 14 via a drive circuit C15. A current detection unit 5 is disposed on the power supply path of the electric blower 2 and is connected to the signal control unit 14. Further, temperature detection means 16 for measuring the temperature in the vicinity of the electric blower 2 or the circuit board 32 is connected to the signal control means 14.

  The operation and operation of the operation of the electric vacuum cleaner in the present embodiment configured as described above are as follows. That is, a power plug (not shown) of the power cord 13 is inserted into an outlet, and the commercial power source 1 is connected to the circuit board 32.

  When the “run” button of the operation means 9 is operated, the electric blower 2 starts rotating and the electric vacuum cleaner starts operation. At this time, the signal control means 14 receives the operation command signal from the operation means 9 and performs phase control of the electric blower 2 and the motor 10 via the drive circuit A4 and the drive circuit B12. The current flowing through the electric blower 2 is rectified and smoothed by the current detection means 5, input to the A / D terminal of the signal control means 14, and calculated in the signal control means 14.

  The phase control angle of the electric blower 2 is determined by this calculation result, and the “dust full” lamp as the display means 6 is also turned on / off by this calculation result. When the “OFF” button of the operation means 9 is operated, the signal control means 14 stops the phase control signal, and the electric blower 2 and the motor 10 are stopped.

  About the vacuum cleaner in this Embodiment comprised as mentioned above, the operation | movement and an effect | action are demonstrated below using the control flowchart shown in FIG.

  When the “Futon compression” button is pressed in Step 0, the “Futon compression” mode and the “Normal” mode are cyclically switched. Step 1 and subsequent steps are processing in the “futon compression” mode.

  In the “futon compression” mode, it is first determined in step 1 whether or not the air passage switching valve 11 is turned on, that is, whether the second intake passage 36 is being used. The “cooling” lamp is turned on, and the usage time of the second intake passage 36 is counted by the timer A. On the other hand, if the air path switching valve 11 is off, that is, the first intake path 35 is being used, the “cooling” lamp is turned off and the timer A is reset.

  Next, in step 2, when the usage time of the timer A, that is, the second intake passage 36 exceeds 30 minutes or the temperature of the temperature detection means 16 becomes less than 80 ° C., the air passage switching valve 11 is turned off, that is, the intake passage is turned off. The first intake path 35 is switched. In other cases, the air passage switching valve 11 is turned on, that is, the second intake passage 36 is used.

After step 3, normal operation is performed (here, the energization amount to the electric blower 2 is set to 1000 W)
The process is different between the case where the power is low, the case where the low input operation is being performed (here, the energization amount to the electric blower 2 is 200 W), and the case where the operation is stopped.

  In steps 4 and 5, the air volume reduction is determined based on the output of the current detection means 5. During normal operation (1000 W operation), the timer B is counted up if the detected current of the current detection means 5 is equal to or less than a second predetermined value (for example, 10 A), and the timer B is reset if it is greater than 10 A. Further, if it is less than the first predetermined value (for example, 5A), the timer C is also counted up, and if it is larger than 5A, the timer C is reset. Here, 10A is a current value when 1000 W operation is performed when the dust collection chamber 23 is full of dust, and 5A is a current value when 1000 W operation is performed with the suction port 33 closed. A value measured by an experiment is used as a set value.

  Steps 9 and 10 are air volume reduction determinations during low input operation (200 W operation). During the low input operation, the timer B is always reset. If the current is larger than 3A in step 9, the low input operation is terminated and the normal operation (1000 W operation) is resumed. In step 10, if the current is 1A or less, the timer C is counted up, and if it is greater than 1A, the timer C is reset.

  In step 6, the first and second intake paths 35, 36 are switched and the energization amount to the electric blower 2 is switched based on the air volume reduction determination results performed in steps 4, 5, 9, and 10. Yes. When the timer C is longer than a first predetermined time (for example, 3 seconds), that is, when 3 seconds have passed since the suction port 33 is closed, the air passage switching valve 11 is turned on to switch the intake passage to the second intake passage 36. If 3 seconds have not elapsed, the timer B determines in step 7. When the timer B is equal to or longer than a second predetermined time (for example, 15 seconds), that is, when 15 seconds have passed since the dust collection chamber 23 is full, the operation is switched to the low input operation (200 W operation).

  It should be noted that during the operation stop, the switching of the intake path and the switching of the energization amount to the electric blower 2 are not performed in Step 6 and Step 7.

  As described above, according to the vacuum cleaner of the present embodiment, since the suction air volume becomes substantially zero and after 3 seconds, that is, after sufficient compression, the second intake path 36 is switched, so that the compression is performed. Air no longer flows back into the bag, the vacuum in the futon compression bag is maintained, and the electric blower 2 and electronic components (not shown) are rapidly cooled by the suction of outside air. Will be.

  Therefore, the futon compression by the futon compression bag can be performed without any problem, and the reliability by the overtemperature protection is improved. Further, it is determined whether the dust collection chamber 23 is full based on the suction air volume, and when it is full, the energization amount is lowered, so that the useless temperature rise of the electric blower 2 and electronic parts can be suppressed, and the reliability is further improved. is there. The time until the energization amount is reduced is 15 seconds. When the futon compression is performed, the electric blower 2 is in a state where the air in the futon compression bag is sucked, that is, the futon is not sufficiently compressed. This is a time required so as not to decrease the energization amount to the power, and is a time set in advance by an experiment.

  In addition, when the temperature in the vicinity of the electric blower 2 or the circuit board 32 rises extremely and exceeds a predetermined temperature, the outside air is introduced through the second intake passage 36 by controlling the air passage switching valve 11. In the unlikely event of overheating, cooling can be performed without any problem, and reliability is further improved.

  Furthermore, since it can be seen that the “cooling” lamp has switched to the second intake passage 36, it is easy for the user to recognize that the futon compression has been completed, and the usability is improved.

  As described above, the vacuum cleaner according to the present invention is effective for vacuum cleaners used in general households, not only for home use but also for business use, built-in type (central cleaner), etc. It can be applied to various types of vacuum cleaners.

1 Commercial Power Supply 2 Electric Blower 4 Drive Circuit A
5 Current detection means 6 Display means (notification means))
7 Power supply circuit 8 Zero cross detection circuit 9 Operating means 10 Motor 11 Air path switching valve (path switching means)
12 Drive circuit B
13 Power cord 14 Signal control means 15 Drive circuit C
16 Temperature Detection Means 21 Vacuum Cleaner Body 22 Electric Blower Chamber 23 Dust Collection Chamber 24 Hose 25 Connection Pipe 26 Intake Port 27 Handle 28 Tip Pipe 29 Extension Pipe 30 Rotating Brush 31 Suction Tool 32 Circuit Board 33 Suction Port 34 Outside Air Intake 35 First 1 intake path 36 second intake path

Claims (5)

  A vacuum cleaner body containing an electric blower that generates suction air, a suction port for sucking dust on the surface to be cleaned, a dust collection chamber for collecting the sucked dust, and an outside air intake for introducing outside air into the electric blower An inlet, current detection means for detecting a current flowing through the electric blower, a first intake path communicating from the intake side of the electric blower via the dust collection chamber to the suction port, and an intake side of the electric blower From the second intake path communicating with the outside air inlet without passing through the dust collection chamber, and normally switching in the first intake path, The electric vacuum cleaner characterized by switching to the second intake path when a state where the current value detected by the current detection means is less than a first predetermined value continues for a first predetermined time.   When the state where the current value detected by the current detection means is less than the second predetermined value continues for a second predetermined time longer than the first predetermined time during operation in the first intake path, the electric blower The electric vacuum cleaner according to claim 1, wherein the amount of current supplied to the battery is reduced.   A circuit board for controlling the electric blower and the like, and temperature detection means for detecting a temperature in the vicinity of the electric blower or the circuit board, and when the temperature detected by the temperature detection means is equal to or higher than a predetermined temperature, The vacuum cleaner according to claim 1 or 2, wherein the vacuum cleaner switches to an intake path. The vacuum cleaner of any one of Claims 1-3 which provided the alerting | reporting means which alert | reports that when it switches to the 2nd intake route.   A plurality of operation modes including a futon compression operation mode for using a futon compression bag and an operation means for a user to switch the operation mode, and only when the operation mode for futon compression is selected, The vacuum cleaner which performs control of Claims 1-4.

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