Air purifiers and air purification systems

Abstract

The objective is to obtain an air purifier and air purification system that can efficiently remove pollutants that have entered a room. [Solution] The control circuit 41 controls the rotation speed of the blower 23 based on the duration of the first inlet / outlet's open position. When the first inlet / outlet 92 is opened, the control circuit 41 performs open-position operation of the blower 23. Based on the duration of the open position, the control circuit 41 determines the extension time of the open-position operation after the first inlet / outlet is closed. The longer the duration of the open position, the longer the extension time of the open-position operation.

Description

Technical Field

[0001] The present disclosure relates to an air purifier and an air purification system.

Background Art

[0002] In conventional pollen prevention devices, pollen in outdoor air is detected by a pollen sensor. Also, the presence of people indoors is detected by a human presence sensor. Then, based on the pollen detection signal from the pollen sensor and the human detection signal from the human presence sensor, the operation of the air purifier is controlled (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In conventional pollen prevention devices, since the pollen sensor is provided outdoors, the amount of pollen that has invaded from the outside into the room is not taken into account. Therefore, it is not possible to efficiently remove pollen indoors.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain an air purifier and an air purification system that can efficiently remove contaminants that have invaded indoors.

Means for Solving the Problems

[0006] The air purifier according to this disclosure is installed facing a room having an opening that can be opened and closed, and comprises an air purifier body having a dust collector and a blower that passes the room air through the dust collector, and a control circuit that controls the blower, the control circuit controlling the rotation speed of the blower based on the opening duration, which is the time from when the opening is opened until it is closed. [Effects of the Invention]

[0007] According to this disclosure, pollutants that have entered the room can be efficiently removed. [Brief explanation of the drawing]

[0008] [Figure 1] This is a cross-sectional view of an air purifier according to Embodiment 1. [Figure 2] Figure 1 is a plan view showing the air purifier. [Figure 3] Figure 1 is a bottom view of the air purifier. [Figure 4] Figure 1 is a plan view showing an example of how an air purification system, including the air purifier, is installed in a building. [Figure 5] Figure 4 is a block diagram of the air purification system. [Figure 6] This is a timing chart showing the relationship between the open / closed state of the first entrance / exit, the operation of the blower when it is open, and the operation of the external blower. [Figure 7] This graph shows an example of the relationship between the time elapsed since the first entrance was opened and the amount of air flowing into the room. [Figure 8] This graph shows an example of the relationship between the count value of the duration of opening and the extended duration of operation during opening. [Figure 9] Figure 5 is a flowchart showing the control process of the blower by the control circuit. [Figure 10] This is a diagram showing the configuration of an air purification system according to Embodiment 2. [Figure 11] This is a circuit diagram showing an example of a motor circuit installed in the motor shown in Figure 10. [Figure 12]It is a circuit diagram showing an example of the control switch device of FIG. 10. [Figure 13] It is a cross-sectional view showing a modification example of the air cleaner of Embodiments 1 and 2. [Figure 14] It is a configuration diagram showing a first example of a processing circuit that realizes each function of the control circuit of Embodiments 1 and 2. [Figure 15] It is a configuration diagram showing a second example of a processing circuit that realizes each function of the control circuit of Embodiments 1 and 2.

MODE FOR CARRYING OUT THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. Embodiment 1. FIG. 1 is a plan view showing an air cleaner according to Embodiment 1. FIG. 2 is a cross-sectional view of the air cleaner of FIG. 1. FIG. 3 is a bottom view showing the air cleaner of FIG. 1.

[0010] In the figure, the air cleaner 10 of Embodiment 1 faces the inside of the room 90 and is installed on the ceiling 91 of the room 90. The air cleaner 10 also includes a cleaner main body 20, a terminal block 30, a wireless receiver 35, and a control unit 40.

[0011] The cleaner main body 20 has a box body 21, a flat panel 22, a blower 23, a dust collecting device 24, and a deodorizing filter 25. FIG. 3 shows a state where the panel 22 is removed from the cleaner main body 20.

[0012] A flange portion 21a is provided at the lower end portion of the box body 21. The flange portion 21a is fixed to the ceiling 91 by a plurality of fixing screws. An intake port 21b and an outlet port 21c are provided inside the flange portion 21a at the lower end portion of the box body 21.

[0013] The panel 22 faces the inside of the room 90 and is attached to the lower part of the box body 21. The panel 22 also faces the intake port 21b and the outlet port 21c.

[0014] The blower 23 is installed inside the box body 21. The blower 23 takes in the air in the chamber 90 into the box body 21 and passes it through the dust collector 24. In Embodiment 1, a multi-wing blower is used as the blower 23. The blower 23 has a fan 26 and a motor 27. The motor 27 rotates the fan 26.

[0015] The dust collector 24 is installed inside the box body 21 alongside the fan 26. The dust collector 24 removes contaminants from the passing air. Examples of contaminants removed by the dust collector 24 include pollen, fine particulate matter, etc. The fine particulate matter is so-called PM2.5. An electrostatic dust collector is used as the dust collector 24 in Embodiment 1.

[0016] The deodorizing filter 25 is arranged on the downstream side of the dust collector 24 inside the box body 21, that is, below the dust collector 24.

[0017] When the fan 26 rotates, the air in the chamber 90 is taken into the box body 21 through the suction port 21b, passed through the dust collector 24 and the deodorizing filter 25 as shown by the arrow in FIG. 1, and returned into the chamber 90 through the discharge port 21c.

[0018] At this time, the air in the chamber 90 flows into the suction port 21b through the space between the flange portion 21a and the panel 22. Also, the air discharged from the discharge port 21c flows out into the chamber 90 through the space between the flange portion 21a and the panel 22.

[0019] The terminal block 30 and the wireless receiver 35 are provided on the upper part of the box body 21. The terminal block 30 has a power line connection part 31, a control line connection part 32, and a signal line connection part 33.

[0020] An external power supply wire is connected to the power line connection part 31. A control line for controlling the operation of an external device is connected to the control line connection part 32. A signal line from an external device is connected to the signal line connection part 33. The wireless receiver 35 receives a wireless signal from the outside.

[0021] The control unit 40 includes a control circuit 41 and a circuit case 42. The control circuit 41 controls the blower 23 and the dust collector 24. The circuit case 42 encloses the control circuit 41.

[0022] Figure 4 is a plan view showing an example of the installation of an air purification system, including the air purifier 10 shown in Figure 1, in a building. In this example, room 90 includes the building's entrance, hall, and shoe closet. The hall is the space adjacent to the entrance. The shoe closet is connected to the entrance and the hall. The air purifier 10 is installed on the ceiling of the hall in room 90.

[0023] Room 90 is provided with a first entrance / exit 92 and a second entrance / exit 93, both of which are openings. The first entrance / exit 92 is an entrance / exit to the outside. The second entrance / exit 93 is an entrance / exit to another room in the building, in this case the living room.

[0024] The first entrance 92 is opened and closed by the front door 94. The second entrance 93 is opened and closed by the interior door 95.

[0025] The air purification system 50 of Embodiment 1 includes an air purifier 10, an open / close sensor 51, and an external blower 52 as an external device.

[0026] The opening / closing sensor 51 is installed at the first entrance / exit 92. The opening / closing sensor 51 also detects whether the first entrance / exit 92 is closed by the front door 94, that is, it detects the open / closed state of the first entrance / exit 92 and outputs an opening / closing signal.

[0027] The open / close signal output by the open / close sensor 51 is a wireless signal and is received by the wireless receiver 35. The wireless receiver 35 inputs the received open / close signal to the control circuit 41.

[0028] The external ventilation device 52 is installed at the entrance of room 90. The external ventilation device 52 blows air into room 90. An air curtain or a circulator is used as the external ventilation device 52. The external ventilation device 52 is connected to the control line connection section 32 and the signal line connection section 33.

[0029] Figure 5 is a block diagram of the air purification system 50 shown in Figure 4. The control circuit 41 controls the rotation speed of the blower 23 based on the duration of the opening of the first inlet / outlet 92. The duration of opening is the time from when the first inlet / outlet 92 is opened until it is closed. The control circuit 41 counts the duration of opening based on the opening / closing signal received by the wireless receiver 35.

[0030] Furthermore, when the first inlet / outlet 92 is opened, the control circuit 41 performs open-time operation of the blower 23. Open-time operation is an operation in which the rotational speed of the blower 23 is increased compared to before the first inlet / outlet 92 was opened, that is, an operation in which the amount of air delivered by the blower 23 is increased.

[0031] When the first inlet / outlet 92 is closed, the control circuit 41 operates the blower 23 at a lower rotational speed than when it is open, or stops the operation of the blower 23. Also, when the first inlet / outlet 92 is closed, the control circuit 41 may operate or stop the blower 23 according to the mode selected by the user.

[0032] Furthermore, the control circuit 41 extends the operation of the blower 23 in the open state even after the first inlet / outlet 92 is closed. The control circuit 41 also determines the extension time of the open state operation after the first inlet / outlet 92 is closed based on the duration of the open state. The control circuit 41 increases the extension time of the open state operation the longer the duration of the open state is. The control circuit 41 has a preset extension time for the open state operation corresponding to the duration of the open state.

[0033] The control circuit 41 transmits control commands to the external blower 52 via the control line connection section 32. The control circuit 41 receives signals from the external blower 52 via the signal line connection section 33.

[0034] The control circuit 41 controls the external blower 52 based on the opening / closing signal received by the wireless receiver 35. In this example, the control circuit 41 operates the external blower 52 when the first entrance / exit 92 is opened. This blows away pollen attached to people entering through the first entrance / exit 92. It also suppresses the intrusion of outside air from the outdoors into the room 90.

[0035] Figure 6 is a timing chart showing the relationship between the open / closed state of the first inlet / outlet 92, the operation of the blower 23 when it is open, and the operation of the external blower 52.

[0036] When the control circuit 41 detects that the first inlet / outlet 92 has been opened by an opening / closing signal from the opening / closing sensor 51, it starts counting the duration of the opening and also starts the operation of the blower 23 during opening and the operation of the external blower 52.

[0037] After the first entrance / exit 92 is closed, the control circuit 41 stops counting the open duration. The control circuit 41 also determines the extension time for open operation based on the open duration. Then, after the extension time has elapsed, the control circuit 41 terminates the open operation. When the open operation terminates, the airflow of the blower 23 returns to its state before the increase.

[0038] Furthermore, the control circuit 41 terminates the operation of the external blower 52 after a predetermined time has elapsed since the first inlet / outlet 92 was closed.

[0039] Figure 7 is a graph showing an example of the relationship between the time elapsed since the first entrance / exit 92 was opened and the amount of air flowing into the room 90. The first entrance / exit 92 is fully open, for example, 2 seconds after the entrance door 94 begins to open. After this, the longer the opening time, the greater the amount of outside air that flows in.

[0040] Figure 8 is a graph showing an example of the relationship between the count value of the open duration and the extended duration of the open operation. The control circuit 41 has a pre-set relationship between the open duration and the extended duration, as shown in Figure 8, for example. This relationship may be set as an equation or as a table.

[0041] When the transient removal rate of the air purifier 10 is η, the processing airflow rate is Q, the spatial volume of the room 90 is V, and the initial concentration of pollutants is C0, the concentration C of pollutants in the room 90 when the air purifier 10 is operated for t hours can be calculated using the following formula.

[0042] C = C0exp(-(ηQ / V)t)

[0043] Therefore, when the target concentration is set to a value closer to 0 than the initial concentration C0, the approximate time to reach the target concentration can be expressed as follows. Here, a and b are constants. N is the count value of the opening duration.

[0044] t∝ln(aN+b)

[0045] The concentration C of contaminants in chamber 90 decreases exponentially. Therefore, by increasing the extended operating time with respect to the count value using a logarithmic function, dust can be efficiently removed from chamber 90. In other words, the extended time can be set appropriately.

[0046] Figure 9 is a flowchart showing the control process of the blower 23 by the control circuit 41 in Figure 5. When the control process starts, the control circuit 41 determines in step S101 whether the first inlet / outlet 92 has been opened. If the first inlet / outlet 92 has not been opened, the control circuit 41 repeats the process in step S101.

[0047] When it is detected that the first entrance / exit 92 has been opened, the control circuit 41 starts counting the duration of the open state and starts operation in the open state in step S102.

[0048] After this, in step S103, the control circuit 41 determines whether the first entrance / exit 92 has been closed. If the first entrance / exit 92 has not been closed, the control circuit 41 repeats the process in step S103.

[0049] When it is detected that the first entrance / exit 92 has been closed, the control circuit 41 terminates the count of the open duration in step S104. Then, in step S105, the control circuit 41 determines the extended duration of the open operation.

[0050] After this, in step S106, the control circuit 41 waits until the extended time has elapsed. Once the extended time has elapsed, in step S107, the control circuit 41 terminates the open-air operation.

[0051] Next, in step S108, the control circuit 41 determines whether a command to stop operation has been input for the air purifier 10. If no command to stop operation has been input, the control circuit 41 returns to the process in step S101. If a command to stop operation has been input, the control circuit 41 terminates the control process for the blower 23.

[0052] In this type of air purifier 10, the control circuit 41 controls the rotation speed of the blower 23 based on the duration of the opening. This allows for the efficient removal of pollutants that have entered the room 90.

[0053] Furthermore, when operating the air purifier 10 based on the presence or absence of people in room 90 detected by a motion sensor, it is difficult to position the motion sensor to detect people more accurately. In contrast, the open / closed state of the first entrance / exit 92 can be detected more easily and accurately.

[0054] Furthermore, when the first inlet / outlet 92 is opened, the control circuit 41 performs an open operation, increasing the rotation speed of the blower 23 compared to before the first inlet / outlet 92 was opened. This allows for more efficient removal of contaminants that have entered the room 90 through the first inlet / outlet 92.

[0055] In other words, if the air purifier 10 is activated only after a pollutant is detected by the dust sensor, there is a risk that the pollutant may spread throughout the room 90 before it reaches the dust sensor. However, when the first inlet / outlet 92 is opened, the open-in operation is performed, so the air inside the room 90 can be quickly purified before the pollutant spreads throughout the room 90.

[0056] Furthermore, the control circuit 41 determines the extended duration of the open operation after the first inlet / outlet 92 is closed, based on the duration of the open period. This allows for more efficient removal of contaminants that have entered the room 90 through the first inlet / outlet 92.

[0057] Furthermore, in the air purification system 50 of Embodiment 1, the control circuit 41 counts the duration of the opening based on the opening / closing signal from the opening / closing sensor 51. Therefore, based on a more accurate duration of the opening, pollutants that have entered the room 90 from the first inlet / outlet 92 can be efficiently removed.

[0058] Furthermore, the control circuit 41 controls external equipment based on the opening / closing signal. This allows for more appropriate management of the environment inside the room 90 according to the opening / closing state of the first entrance / exit 92.

[0059] Furthermore, since an external blower 52 is used as an external device, the effects of pollutants inside the room 90 can be reduced more efficiently.

[0060] Furthermore, the first entrance / exit 92 is an entrance / exit to the outside at the building's main entrance. Therefore, contaminants entering the entrance from the outside can be removed more efficiently.

[0061] Embodiment 2. Next, Figure 10 is a configuration diagram showing a partial block of the air purification system according to Embodiment 2. The air purification system 50 of Embodiment 2 includes an air purifier 10, an open / close sensor 51, a control switch device 53, a router 54, and a server 55.

[0062] The control switch device 53 and the router 54 are installed in the building where room 90 is located. The server 55 is located remotely from the building.

[0063] The control circuit 41 in Embodiment 2 is located within the server 55. In other words, the function of the control circuit 41 is part of the function of the server 55.

[0064] The open / close signal from the open / close sensor 51 is transmitted to the server 55 via the router 54 and the communication network 56, and input to the control circuit 41.

[0065] The control circuit 41 generates control commands to perform the same control as in Figure 9 based on the opening / closing signal. That is, the control circuit 41 counts the duration of the open state based on the opening / closing signal. Furthermore, when the first inlet / outlet 92 is opened, the control circuit 41 generates control commands to perform open-state operation of the blower 23.

[0066] Furthermore, the control circuit 41 determines the extension time of the open operation after the first entrance / exit 92 has been closed, based on the duration of the open operation. The control circuit 41 has a preset extension time for the open operation corresponding to the duration of the open operation.

[0067] The control commands generated by the control circuit 41 are transmitted from the server 55 to the router 54 via the communication network 56. The control commands received by the router 54 are input to the control switch device 53.

[0068] The control switch device 53 controls the blower 23 based on the input control command. That is, the control circuit 41 controls the rotation speed of the blower 23 via the control switch device 53.

[0069] The rotation speed of the blower 23 can also be switched by the user operating the control switch device 53. For example, the user can manually switch the rotation speed of the blower 23 or stop the operation of the blower 23 by operating the control switch device 53. This makes it possible to stop the open operation midway or to arbitrarily change the extended time of the open operation.

[0070] Furthermore, users can communicate with the router 54 and server 55 via the communication network 56 from their user terminal 57. The user terminal 57 can be, for example, a laptop computer, a tablet, or a smartphone.

[0071] The user can use the user terminal 57 to check the contents of control commands and operate the control switch device 53.

[0072] Figure 11 is a circuit diagram showing an example of a motor circuit provided in the motor 27 of Figure 10. Figure 11 shows the circuit when an AC induction motor is used as the motor 27. Load drive power is supplied to the motor circuit from the control switch device 53.

[0073] The motor circuit includes a main winding 401, an auxiliary winding 402, a first capacitor 403, and a second capacitor 404.

[0074] The main winding 401 and the auxiliary winding 402 are connected in parallel to the AC power supply. The first capacitor 403 is connected in series with the auxiliary winding 402. As a result, the phase of the auxiliary winding 402 is shifted by 90° relative to the phase of the main winding 401.

[0075] One end of the parallel circuit 405, which includes the main winding 401, the auxiliary winding 402, and the first capacitor 403, is connected to the common terminal 411 of the AC power supply. The other end of the parallel circuit 405 is connected in parallel to the first wiring 406 and the second wiring 407. The first wiring 406 is connected to the strong terminal 412 of the AC power supply. The second wiring 407 is connected to the weak terminal 413 of the AC power supply.

[0076] The second capacitor 404 is provided on the second wiring 407. That is, the parallel circuit 405 is connected to the weak terminal 413 via the second capacitor 404.

[0077] The rotational speed of the capacitor induction motor is controlled by switching the AC power supply connection between the strong terminal 412 and the weak terminal 413.

[0078] Figure 12 is a circuit diagram showing an example of the control switch device 53 shown in Figure 10. The control switch device 53 includes an input unit 501, a power relay 502, a strength switching relay 503, and a switch control unit 504.

[0079] AC power is supplied to the input unit 501 from an external power supply 505. The input unit 501 converts a portion of the supplied AC power into constant DC power and supplies it to the switch control unit 504 via the DC low-voltage wiring 506. The input unit 501 also outputs a portion of the supplied AC power as load power to the motor 27.

[0080] The power relay 502 is a relay that switches the power on and off. The switch control unit 504 controls the opening and closing of the power relay 502 via the power signal line 507. When the power signal line 507 is energized, the power relay 502 is in a closed state, i.e., conductive state. When the power signal line 507 is not energized, the power relay 502 is in an open state, i.e., interrupted state.

[0081] The strength / weak switching relay 503 is a relay that switches the operation of the blower 23 between high and low speeds. The switch control unit 504 controls the opening and closing of the strength / weak switching relay 503 via the strength / weak signal line 508. When the command signal input to the strength / weak signal line 508 is a high command, the strength / weak switching relay 503 becomes conductive with the high terminal 412. When the command signal input to the strength / weak signal line 508 is a low command, the strength / weak switching relay 503 becomes conductive with the low terminal 413.

[0082] When a high-power command is output from the switch control unit 504, 100V AC power is applied between the common terminal 411 and the high-power terminal 412 of the motor 27, and the blower 23 is operated at high power. When the blower 23 is open, it is operating at high power.

[0083] When a low-power command is output from the switch control unit 504, 100V AC power is applied between the common terminal 411 and the low-power terminal 413 of the motor 27, and the blower 23 is operated at a low power setting.

[0084] Other configurations and operations in Embodiment 2 are the same as in Embodiment 1.

[0085] This configuration also provides the same effects as in Embodiment 1. Furthermore, by using a control switch device 53 that can control the strength of operation via a communication network 56, the air purifier 10 can be easily controlled based on the opening / closing signal from the opening / closing sensor 51.

[0086] Furthermore, since the control switch device 53 is operable by the user, the air purifier 10 can be operated according to the user's request.

[0087] Note that the air purifier 10 is not limited to being installed on the ceiling 91 of the room 90; for example, it may be installed on a wall. In this case, the air purifier 10 will be rotated 90 degrees from the position shown in Figure 2.

[0088] Furthermore, the dust collector 24 is not limited to an electrostatic dust collector; for example, it may be a filter-type dust collector as shown in Figure 13.

[0089] Furthermore, the type of blower 23 is not limited to a multi-blade blower; for example, it may be a centrifugal blower.

[0090] Furthermore, the dust collector 24 may be positioned upstream of the blower 23.

[0091] Alternatively, the control circuit 41 may be built into the air purifier unit 20.

[0092] Alternatively, the opening / closing sensor 51 may transmit the opening / closing signal to the control circuit 41 via a wire.

[0093] Furthermore, the external equipment is not limited to the external blower 52.

[0094] Furthermore, the opening is not limited to the first entrance / exit 92. That is, the opening is not limited to an entrance / exit between the room 90 and the outside, but may also be an entrance / exit between adjacent rooms within the building, a window between the room 90 and the outside, etc.

[0095] For example, an air purifier 10 may be installed in the living room shown in Figure 4, and the rotation speed of the blower 23 may be controlled based on the duration of opening of the second entrance / exit 93. Alternatively, an air purifier 10 may be installed in the living room shown in Figure 4, and the rotation speed of the blower 23 may be controlled based on the duration of opening of a window in the living room.

[0096] Furthermore, the control circuit 41 may not only extend the duration of operation while the door is open, but also continuously or stepwise change the rotation speed of the blower 23 during operation while the door is open, based on the duration of the door's open period. In this case, the longer the duration of the door's open period, the higher the rotation speed of the blower 23 during operation while the door is open is set.

[0097] Furthermore, each function of the control circuit 41 in Embodiments 1 and 2 is realized by a processing circuit. Figure 14 is a configuration diagram showing a first example of a processing circuit that realizes each function of the control circuit 41 in Embodiments 1 and 2. The processing circuit 100 in the first example is dedicated hardware.

[0098] Furthermore, the processing circuit 100 can be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. In addition, each function of the control circuit 41 may be implemented by an individual processing circuit 100, or all functions may be implemented together by the processing circuit 100.

[0099] Figure 15 is a configuration diagram showing a second example of a processing circuit that realizes each function of the control circuit 41 of Embodiments 1 and 2. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0100] Processor 201 can include, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a microprocessor, a microcontroller, or a DSP (Digital Signal Processor).

[0101] In the processing circuit 200, each function of the control circuit 41 is realized by software, firmware, or a combination of software and firmware. The software and firmware are written as programs and stored in memory 202. The processor 201 realizes each function by reading and executing the programs stored in memory 202.

[0102] The program stored in memory 202 can be said to cause the computer to execute the procedures or methods of each of the parts described above. Here, memory 202 refers to non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (Electrically Erasable and Programmable Read Only Memory). Magnetic disks, flexible disks, optical disks, compact disks, minidiscs, DVDs, etc., also fall under the category of memory 202.

[0103] Furthermore, some of the functions of the above-mentioned parts may be implemented using dedicated hardware, while others may be implemented using software or firmware.

[0104] Thus, the processing circuit can realize the functions of each of the above-mentioned parts through hardware, software, firmware, or a combination thereof.

[0105] Although preferred embodiments have been described in detail above, the invention is not limited to the embodiments described above, and various modifications and substitutions can be made to the embodiments described above without departing from the scope of the claims.

[0106] The various aspects of this disclosure are summarized below as an appendix.

[0107] (Note 1) A purifier body is provided facing a room having an opening that can be opened and closed, and has a dust collection device and a blower that passes the air in the room through the dust collection device, and Control circuit for controlling the blower Equipped with, The control circuit controls the rotation speed of the blower based on the opening duration, which is the time from when the opening is opened until it is closed. (Note 2) The air purifier according to Appendix 1, wherein the control circuit, when the opening is opened, performs an open operation, which is an operation in which the rotation speed of the blower is increased compared to before the opening was opened. (Note 3) The control circuit determines the extended period of operation while the opening is open after the opening has been closed, based on the duration of the opening, as described in Appendix 2 of the air purifier. (Note 4) An opening / closing sensor that detects the open / closed state of the opening and outputs an opening / closing signal, and Air purifiers listed in any one of the items from Appendix 1 to Appendix 3 Equipped with, The control circuit is an air purification system that counts the duration of the open state based on the open / close signal from the open / close sensor. (Note 5) External equipment installed outside the aforementioned air purifier Furthermore, The control circuit controls the external device based on the on / off signal in the air purification system described in Appendix 4. (Note 6) The air purification system described in Appendix 5, wherein the external equipment is an external blower installed in the room and blows air into the room. (Note 7) The aforementioned room includes the building's entrance, The air purification system according to any one of the items 4 to 6, wherein the opening is an entrance / exit provided in the entrance. (Note 8) Control switch device for controlling the rotation speed of the aforementioned blower Furthermore, The control circuit controls the rotation speed of the blower via the control switch device. The air purification system according to any one of the appendices 4 to 7, wherein the operation method of the blower can also be switched by the user operating the control switch device. [Explanation of Symbols]

[0108] 10 Air purifier, 20 Air purifier unit, 23 Blower, 24 Dust collector, 41 Control circuit, 50 Air purification system, 51 Opening / closing sensor, 52 External blower (external equipment), 53 Control switch device, 90 Room, 92 First entrance / exit (opening).

Claims

1. A purifier body is provided facing a room having an opening that can be opened and closed, and has a dust collection device and a blower that passes the air in the room through the dust collection device, and Control circuit for controlling the blower Equipped with, The control circuit controls the rotation speed of the blower based on the opening duration, which is the time from when the opening is opened until it is closed.

2. The air purifier according to claim 1, wherein the control circuit, when the opening is opened, performs an open operation, which is an operation in which the rotation speed of the blower is increased compared to before the opening was opened.

3. The air purifier according to claim 2, wherein the control circuit determines the extension time of the open operation after the opening has been closed, based on the open duration.

4. An opening / closing sensor that detects the open / closed state of the opening and outputs an opening / closing signal, and Air purifier according to any one of claims 1 to 3 Equipped with, The control circuit is an air purification system that counts the duration of the open state based on the open / close signal from the open / close sensor.

5. External equipment installed outside the aforementioned air purifier Furthermore, The air purification system according to claim 4, wherein the control circuit controls the external device based on the on / off signal.

6. The air purification system according to claim 5, wherein the external equipment is an external blower installed in the room and blows air into the room.

7. The aforementioned room includes the building's entrance, The air purification system according to claim 4, wherein the opening is an entrance / exit provided in the front door.

8. Control switch device for controlling the rotation speed of the aforementioned blower Furthermore, The control circuit controls the rotation speed of the blower via the control switch device. The air purification system according to claim 4, wherein the rotation speed of the blower can also be switched by the user operating the control switch device.

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