WO2023218354A1

WO2023218354A1 - The ventilation-air purification system inside the elevator cabin

Info

Publication number: WO2023218354A1
Application number: PCT/IB2023/054799
Authority: WO
Inventors: Mostafa MORADI DOOST
Original assignee: Moradi Doost Mostafa
Priority date: 2022-05-09
Filing date: 2023-05-09
Publication date: 2023-11-16

Abstract

The ventilation and air purification system of the elevator cabin is based on the input of installed sensors. The system is an air conditioning, air purification, and air temperature change system in the comfortable temperature range for small closed environments such as elevators and similar cabins. When the system is on, it simultaneously cools the air inside the cabin and conducts the purification process. The air quality inside the cabin is constantly checked by sensors, and if the air quality in the cabin decreases, the air device inside the elevator pit channel is checked for quality. If it has the desired quality, it is injected into the cabin through the missing box after purification, but if it does not have the required quality, the air inside the cabin is sucked into the device and passed through three filters and illuminated by a lamp. UV and the addition of negative ions by the ionizer module destroys any gas, suspended particles, disease agents and odors.

Description

The ventilation-air purification system inside the elevator cabin

[0001 ] The ventilation-air purification system inside the elevator cabin, based on input from installed sensors tubes is an application filed and provided based on a local Application, at IRAN'S Islamic Republic of Iran Intellectual Property Center No. 140150140003001 170 dated on May09, 2022.

Technical Field

[0002] The claimed system of this invention is an air conditioning system, an air purification system, and an air temperature changer within the comfort temperature range for small closed environments, such as elevators and similar cabins. This invention measures and controls the air quality of the desired environment. It removes harmful factors and increases beneficial factors. This way, it creates more comfort and well-being for the people in that environment. This goal is achieved through access to fresh air with desirable and ideal characteristics. This invention belongs to the field of air conditioning and air purification systems.

Background Art

[0003] Elevator cabin ventilation is an important part of the safety and cooling system, installed in the cabin to purify the air and create fresh air for passengers. Ventilation in the elevator cabin is a vital system that requires service and periodic maintenance. To understand the importance of the ventilation system of the elevator cabin, consider these examples: water leakage from residential complex waste or strong perfume smell inside the elevator cabin. In this case, the use of elevator cabin ventilation becomes very important. Components of elevator cabin ventilation include a condenser, compressor, expansion valve, and refrigeration cycle evaporator. Contrary to what many people think, the air conditioner is not considered elevator cabin ventilation and is only one of its subsets. Ventilation in the elevator cabin is essential for maintaining good air quality and comfort. The ventilation system brings in fresh air from the elevator shaft and removes stale air from the cabin. The fan inside the cabin helps to distribute the air evenly. The ventilation system should be on at all times when the elevator is in use. A new idea was proposed to update the elevator cabin ventilation system, in a portable form that has a MERV 14 filter with ionization before and after the filter. The portable device with a MERV 14 filter and ionization will replace the blower assembly at the top of the elevator cabin. This design is patent pending and claims to reverse the air flow in the elevator cabin. It uses filtered air to pressurize the space and force the pollutants to move toward the lift. Today's ventilation systems used in elevator cabins are not comparable to old ventilation systems that had limited air exchange and filtration. They have more advanced features and functions that improve the air quality and comfort in the elevator. The water from the drain was an obstacle for the design engineers to think about the ventilation of the elevator by the DX system. Transferring water from the drain into the elevator shaft violates the building engineering system's law, and this prevents the implementation of this idea. New ventilation systems using engineering methods have solved this problem as the building industry develops. A stainless alloy tray at the bottom of the device directs the water from the drain into it, and then an axial vane cooling condenser fan sprays the water as powder towards the condenser. When the temperature sensor detects that the return air inlet has reached the set point, this new elevator cabin cooler and ventilation system will either run the air conditioning system at half power or just circulate the air using modern technology. The system will also work at half capacity and power when the sensor detects that the cabin is empty of passengers. The elevator cabin fan brings fresh air into the cabin and improves the air quality inside the elevator. It is programmed to operate in the temperature range of 16 to 48 degrees Celsius and it solves the problem of high temperature inside the elevator shaft.

[0004] Items similar patent to the claimed invention:

[0005] US20080207106 - blower controller for elevator system

[0006] US5593347 - emergency ventilation system for elevator cab

[0007] CN110282527 - elevator air purifying system and use method thereof

[0008] US5460570 - ventilator for elevator cage

[0009] Different brands offer elevator cooler or elevator purifier products for air conditioning. Some of these companies produce air purifiers and coolers for elevators with different brands, which other countries are applying for. The designers of this system considered the background and experiences from both the air conditioning and the former purification systems. The primary elevators used a traditional and normal ventilation system, which produced cold air and circulated it in the cabin; this system only cooled the cabin and did not purify the air. This primary air purifier works as a multi-bed filter, which includes: a primary filter, a HEPA filter, and a UV lamp. It is installed and used inside the cabin; it is simple and single-purpose, but it purifies the air. The device claimed in this invention has capabilities such as cooling and air purification. This device has additional features, e.g., a user interface for controlling the cooling and air purification functions of the device; The ease and practicality of this device in the elevator cabin, as well as several features have been added and designed.

These capabilities include producing fresh air; detecting all movements inside the cabin; and removing the device from the circuit when it is not used. The device is capable of eliminating smoke, odor, viruses, pollutants, dust, and allergens from the air; producing cooling air in summer and purifying air in all seasons; and detecting movements inside the cabin to remove the device from the circuit when it is not used.

Summary of Invention

[0010] The device claimed in this invention is a ventilation system for elevator cabins that comprises 3 filter beds, UV lamps and ionizers in the device, which eliminate smoke, odor, viruses, pollutants, dust, and allergens from the air flow path from the suction valve to the blower valve to the cabin and circulate and pass the air through all the filters. The device claimed in this invention has the capability of cooling inside the cabin, which cools and conditions the air inside the cabin by the refrigeration cycle (including the evaporator, condenser, condenser fan, evaporator fan, compressor, control board, and remote control). The smartness of the device claims to help people in the cabin and prevent suffocation or shortness of breath, using its artificial intelligence. The elevator ventilation system detects the entry of fresh air and oxygen injection, if necessary, or the possible entry of pollutants into the cabin, such as smoke, gas, and odor. It uses tools such as UV lamps, ionizers, oxygen capsules, mixing boxes, and three filter beds and smart sensors. These tools are controlled by artificial intelligence. Therefore, all the problems in this regard will be fixed with the above tools and methods.

Technical Problem

[0011] Due to the limited space inside the moving cabin and the presence of elevator operators or the lack of proper social distance, the risk of disease transmission in this environment is very high.

[0012] On hot days or due to the presence of people in a small environment, the increase in temperature in the moving cabins is often uncomfortable.

[0013] Similar to the problems of high temperature and low oxygen, due to the small space and the impossibility of adequate air ventilation, in addition to the accumulation of carbon dioxide and various harmful gases, people in the cabin are generally bothered by the smell of unpleasant odors.

[0014] Due to the occurrence of technical problems or accidents, there is always the possibility of people being locked up in the moving cabins. Being in these conditions, in addition to mental problems and stress, makes it impossible for people to survive due to the poor air quality and high temperature.

[0015] Until now, small spaces, such as elevator cabins, were equipped with a indoor air suction fan in the simplest case. Alternatively, air purification and air conditioning were operated separately and continuously regardless of the conditions. If people are trapped in these environments, such as the elevator cabin, and there is a lack of oxygen, none of the mentioned systems have the ability to introduce fresh air into the cabin or, in case of smoke or other pollutants, to remove pollutants and create a favorable environment until the rescue team arrives.

Solution to Problem

[0016] The ventilation and air purification system of the elevator cabin is based on the input of installed sensors. The system is an air conditioning, air purification, and air temperature change system in the comfortable temperature range for small closed environments such as elevators and similar cabins. When the system is on, it simultaneously cools the air inside the cabin and conducts the purification process. [0017] Many problems are caused by limited space inside the elevator cabin, such as: the high rate of disease transmission, the indoor air temperature being too high or too low, and the increase of harmful gases such as carbon dioxide and unpleasant odors. To solve these problems, all the pollution must be removed by using three layers of filters, UV lamps and ionizers in the air flow path from the suction valve to the blower valve and from the cabin to the filters. This will destroy all types of viruses and bacteria. A system that can cool the air inside the cabin and automatically blow fresh air with enough oxygen into it is needed. The system should also have an intelligent mechanism to detect and eliminate any unfavorable air factors that may enter the cabin.

[0018] Each ventilation system and air purification inside the elevator device consists of 3 main parts of the cooling and air purification, and an analyzer (artificial intelligence) which is installed on top of the elevator cabin. This ventilation system intelligently checks the air quality inside the cabin. The cooling system includes the compressor, fans, condenser, and evaporator, which are completely controlled by the artificial intelligence of the device. The air purification system includes a P-P filter, HEPA, active carbon, and negative ionizer, all of which are able to remove smoke, pollutants, fine dust, viruses, and unpleasant odors. Also, this section is a 1 - or 2-liter oxygen capsule that is equipped with an electric valve, and when necessary, oxygen is added to the cabin air. The mixing box is an automatic valve that mixes air and returns air inside the cabin which is controlled by artificial intelligence. Artificial intelligence or device controller, an electronic board that is equipped with oxygen, carbon dioxide, smoke, motion, etc. sensors and commands the device according to the measurements made by the sensors.

[0019] The device has 2 different functions:

[0020] a. normal mode

[0021 ] The entry of a person(s) into the elevator is detected using the movement sensor and the following actions are taken immediately:

[0022] Temperature measurement: If the temperature is higher than the set limit, it gives the command to turn on the cooling system.

[0023] Starting the air circulation fan to pass the air through the filters and purify it. [0024] Measurement of oxygen, smoke, carbon dioxide and inside the elevator shaft and cabin: If the air in the elevator shaft is of high quality, the mixing box will be open.

[0025] The device checks the oxygen, carbon dioxide and smoke levels in the air. If they change abnormally (for example, during a fire), the device removes smoke and filters the air, and injects oxygen into the cabin. This only happens when the motion sensor detects someone inside the cabin.

[0026] b. Power outage

[0027] During a power outage, the device stays on using its internal battery, but the cooling system is disconnected (due to high power consumption) and the cabin is checked for fullness or emptiness using a motion sensor.

[0028] If the cabin is empty, the machine will be in standby mode.

[0029] If there are a person or persons in the cabin, the air conditioning fan and one or more lighting lamps inside the cabin will be turned on.

[0030] The device monitors the air quality inside the cabin and the elevator shaft by measuring the oxygen, carbon dioxide and smoke levels. If they change abnormally (for example, during a fire), the device filters the air, removes smoke and adds oxygen to the cabin. This only happens when someone is inside the cabin, as detected by the motion sensor. If the air conditions inside the cabin are not favorable (the amount of oxygen is lower than the specified limit), a certain amount of oxygen is injected into the cabin.

Advantageous Effects of Invention

[0031] Adding oxygen to the cabin during confinement and oxygen deficiency

[0032] Eliminating and reducing pathogens

[0033] Removing smoke, gas and any pollutants

[0034] Creating a favorable environment for people trapped in the elevator and preventing their death until rescue forces arrive

[0035] Reducing the stress level of people who are afraid of being locked in a closed space and do not use the elevator for transportation

[0036] Persuading owners or builders to use elevators Brief Description of Drawings

Fig.1

[0037] [Fig.1 ] 3D view of cooling components

Fig.2

[0038] [Fig.2] Location of oxygen capsule, UV lamp and smart box board

Fig.3

[0039] [Fig.3] 3D view of ventilation and air purification system for elevator cabin with components

Fig.4

[0040] [Fig.4] 3D view of ventilation and air purification system for elevator cabin with sensors and remote control

Fig.5

[0041] [Fig.5] 3D view of ventilation and air purification system for elevator cabin

Fig.6

[0042] [Fig.6] Mixing box components

Description of Embodiments

[0043] According to drawings 1 to 6:

[0044] The chassis of the device (101 ) is made of closed profile 20x20 with a thickness of 1 mm according to the required dimensions through welding.

[0045] Evaporator - DX cooling coil (102) is connected to the body of the device with screw number 4.

[0046] The upper and lower space separating sheet (103) is made of galvanized material with a thickness of 1 mm, after cutting and bending, it is connected to the chassis with screw number 4 in order to place and secure the fan evaporator and separate the upper and lower space.

[0047] The water tray - drain (104) is placed under the evaporator - DX cooling coil (102) to collect water and direct it to the condenser (136); the water from the condensate is vaporized by the condenser (136) and directed to the elevator pit. [0048] The compressor (107) with a power of 1/3 horsepower is connected to the chassis of the machine with the number 6 bolt and nut.

[0049] The battery (106) volt 65 amperes are placed in the lower part of the device next to the compressor (107).

[0050] Condenser fan (CFM 200) (108) with a plastic impeller (low noise) is installed next to the device with 4-way bolts and nuts to cool the condenser (136).

[0051 ] Condenser (136) is installed next to the condenser fan (108) with 4 screws.

[0052] The main fan of the device or the evaporator fan (CFM 300) (105) is connected to the upper and lower space separating sheet (103) by means of screws and nuts 6.

[0053] The condenser water tray (100) is placed under the condenser (136), and the water directed on the condenser (136) is vaporized here.

[0054] The external body of the device, which includes the upper body of the device (131 ) and the side body of the device (142), is made of 1 mm galvanized sheet and is connected to the chassis of the device (101 ) with 5 self-tapping screws.

[0055] The oxygen capsule (114) or 2 liters is placed according to the drawings and fixed with a metal belt.

[0056] The separator sheet for the oxygen capsule space (1 12) is made of 5.1 mm galvanized sheet and is connected to the body and chassis with 4 screws and 6 self-tapping screws.

[0057] Electric valve (113) suitable for high pressure gas fluid and of normal type is installed on the oxygen capsule (1 14).

[0058] UV lamp (1 1 1 ) is installed under the upper body of the device (131 ), in the feeding path of the UV lamp (1 1 1 ), a micro switch (144) is installed under the upper body of the device (131 ) to the chassis of the device (101 ).

[0059] The air seal (143) is placed between the evaporator-cooling DX coil (102) and the body of the device and is connected to the evaporator-cooling DX coil (102) and the body with self-tapping screw No. :5.

[0060] The device remote (120) is connected to the main board of the device with a

6x5.0 cable and is installed in the elevator cabin. [0061 ] The supporting base of the ionizer module (121 ) is made of a 1 mm galvanized sheet and is connected to the upper body of the device (131) with a 4 mm rivet. The module (145) is connected to the support base of the ionizer module (121 ) with self-tapping screw No. :4.

[0062] Outside particulate matter sensor (118), cabin particulate matter sensor (109), outside smoke sensor (110) Cabin smoke sensor (134) Outside PIR sensor (116) Cabin PIR sensor (132) Outside oxygen sensor (117) Cabin oxygen sensor (133), outside carbon dioxide sensor (119), cabin carbon dioxide sensor (135) Cabin raw gas sensor (128) and outside raw gas sensor (138) are placed according to the application and according to the map. It should be noted that the sensors are connected to the main board of the device with the required cable.

[0063] The upper body of the device (131 ) is made of 1 mm galvanized sheet and is connected to the chassis of the device (101) by 3 hinges. Each hinge includes 3 screws and 4 are installed on the chassis and door.

[0064] blower hose (125) from 3-layer polyester tube on one side to blower conversion (126) which is connected to the cabin on the other side, and on the other side it is connected to the mixing box (124)

[0065] The suction hose (130) from the 3-layer polyester pipe on one side to the suction converter (129) which is connected to the cabin on the other side, and on the other side is connected to the evaporator fan (105).

[0066] The outside air suction pipe (122) and the cabin air outlet pipe (123) are galvanized metal pipes that are connected to the mixing box (124).

[0067] The DC motor of the mixing box (139) is 12 volts, which is connected to the body of the mixing box (124) by means of a 5.2 mm screw. The body of the mixing box (124) is made of 1 mm sheet and is connected to the body of the device with a 5 mm screw.

[0068] The air seal of the mixing box (301 ) is made of a 1 mm galvanized sheet and is connected to the body of the mixing box (302) with a 4 mm rivet. Damper (103) is made of a 1 mm galvanized sheet, on both sides of which a 5 mm steel rod is welded in the specified place in the mixing box and to a specified length. A pulley mixing box (140) is installed on the damper shaft (303) inside the mixing box (124). Two micro switches are installed on the body of the fresh air box to help the damper (303) stand accurately and correctly in the right place.

[0069] The steering box of the mixing box is made of 1 mm galvanized sheet The steering box is installed on the door of the device with 4mm rivets. Electronic boards are installed in the steering box.

[0070] blower conversion (126) which is connected to the blower hose (125) on one side and is made of 1 mm galvanized sheet on the other side to the roof of the cabin. The suction conversion (129) which is connected to the suction hose (130) on one side and is made of 1 mm galvanized sheet on the other side.

[0071] Before entering the cabin, the air entering the cabin passes through a set of filters, which include HEPA, PP, and active carbon filters, and is connected to the device body from the inside by means of holders. It should be noted that the legs are connected to the body with 5 screws.

Examples

[0072] This invention is in the field of air conditioning and air purification. The whole process of this product is done automatically and intelligently. In the start mode, the device cools the interior of the cabin by the refrigeration cycle (air conditioner) and performs purification. The air quality inside the cabin is constantly checked by sensors. If the air quality of the cabin drops, the air device inside the elevator pit channel, checks the quality. If it has the desired quality, it is injected into the cabin through the mixing box after purification, but if it is not of the required quality, the air inside the cabin is drawn into the machine and purified. Passing through three HEPA and P-P and carbon dioxide filters and through the UV lamp, all viruses are destroyed and the ionizing module adds negative ions to the air. If there is smoke, unpleasant smell, gas, allergenic particles and pollutants, it will be removed. It should be noted that if the air enters the elevator pit channel, the purification process is done.

Industrial Applicability

[0073] This device has ventilation and purification capabilities and produces cooling and air purification. Additional features have been installed in the elevator cabin for its ease and practicality. While implementing these features, several features have been added and designed, which include the production of fresh air, the intelligence of all movements inside the cabin. If the device is not used, it is removed from the circuit and can inject the necessary oxygen when necessary or in case of accidents, or in case of lack of oxygen. At the same time, with this process, smoke, gas, unpleasant smell, all viruses and all pollutants are eliminated and fresh air is created. This product can be installed easily in elevator production workshops before installation in buildings. It can also be used for elevators in various settings, including commercial, administrative, medical and residential. This product is very easy to install.

Reference Signs List

[0074] 100. Condenser water tray

[0075] 101 . Chassis of the device

[0076] 102. Evaporator-cooling dx coil

[0077] 103. Upper and lower space separating sheet

[0078] 140. Water tray - drain

[0079] 105. Evaporator fan

[0080] 106. Battery

[0081] 107. Compressor

[0082] 108. Condenser fan

[0083] 109. Cabin particulate matter sensor

[0084] 110. Outside smoke sensor

[0085] 111 . UV lamp

[0086] 112. Separator sheet for the oxygen capsule space

[0087] 113. Electric valve

[0088] 114. Oxygen capsule

[0089] 115. Smart box board

[0090] 116. Outside pir sensor

[0091] 117. Outside oxygen sensor

[0092] 118. Outside particulate matter sensor [0093] 119. Outside carbon dioxide sensor

[0094] 120. Device remote

[0095] 121 . Supporting base of the ionizer module

[0096] 122. Outside air suction pipe

[0097] 123. Outside air suction pipe

[0098] 124. Mixing box

[0099] 125. Blower hose

[0100] 126. Blower conversion

[0101] 127. Oxygen output

[0102] 128. Cabin raw gas sensor

[0103] 129. Suction converter

[0104] 130. Suction hose

[0105] 131 . Upper body of the device

[0106] 132. Cabin pir sensor

[0107] 133. Cabin oxygen sensor

[0108] 134. Cabin smoke sensor

[0109] 135. Cabin carbon dioxide sensor

[0110] 136. Condenser

[0111 ] 137. Supporting condenser fan

[0112] 138. Outside raw gas sensor

[0113] 139. De motor of the mixing box

[0114] 140. Pulley mixing box

[0115] 141 . Condenser hot air outlet

[0116] 142. Side body of the device

[0117] 143. Air seal

[0118] 144. Micro switch [0119] 145. Ionizer module

[0120] 301 . Air seal of the mixing box

[0121 ] 302. Body of the mixing box

[0122] 303. Damper saft

[0123] 304. i

Claims

[Claim 1] The ventilation and air purification system of the elevator cabin is based on the input of installed sensors. The system is an air conditioning, air purification, and air temperature change system in the comfortable temperature range for small closed environments such as elevators and similar cabins. When the system is on, it simultaneously cools the air inside the cabin and conducts the purification process. That consists of 3 main parts: cooling; air conditioner and analyst (Artificial Intelligence) It is installed on top of the elevator cabin and using the defined algorithm to Checks the air quality inside the cabin and keeps them at the comfort level defined.

[Claim 2] According to claim 1 , The main components of the introduced sections are: Metal body and chassis of the device; electronic board; cooling system; Filters; UV lamp and ionizer module; Sensors; Battery for emergency power supply of the device in case of power outage; Fresh air valve; The main electro fan; Oxygen capsule and electronic valve

[Claim 3] According to claim 2, The main body and chassis of the device, which consists of profile and galvanized sheet, and is used to install other components on the chassis and protect them, as well as to seal the device.

[Claim 4] According to claim 2, The smart boards of the device are installed in a special box for easy access to the service, which includes the temperature control board (control of the cooling system) by 3 thermometer sensors that are installed inside the cabin, on the evaporator and in the heating channel of the device, and the smart board of the device which checks quantities such as the amount of oxygen, carbon dioxide, carbon monoxide, raw gases, smoke by the relevant sensors and controls the components of the device according to the conditions

[Claim 5] According to claim 2, The cooling system that includes compressor, condenser, evaporator, condenser fan and expansion valve is controlled by the mentioned board. In such a way that the air inside the cabin is sucked from the suction channel by the device's main fan, and after passing through the evaporator, it is cooled and directed into the cabin through the blower channel.

[Claim 6] According to claim 2, The filters include HEPA filter, (PP) filter, active carbon filter, which is connected to the body of the device by the support legs at the end of the suction channel, and the entire air flow that enters the device passes through the filters.

[Claim 7] According to claim 2, The UV lamp is installed from the inside to the roof of the device after the filters to eliminate viruses, bacteria and fungi. In order to prevent damage by UV rays, the UV lamp is equipped with a micro switch, which cuts off the power flow of the UV lamp when the door of the device is opened.

[Claim 8] According to claim 2, The ionizing device is also used to eliminate smoke, odor, pollutants, allergenic dust.

[Claim 9] According to claim 2, Oxygen sensor, carbon dioxide sensor, carbon monoxide sensor, raw gas sensor and smoke sensor are installed separately inside the cabin and at the beginning of the fresh air intake channel to check the amount of the mentioned factors. A PIR motion sensor is installed on the roof of the cabin to detect the presence or absence of people inside the cabin.

[Claim 10] According to claim 2, A DC battery is installed at the bottom of the device, the smart board charges the battery and feeds the device from the battery to continue the process in case of emergency and power failure.

[Claim 11] According to claim 2, The fresh air valve consists of a 12V DC motor that is connected to the damper by a belt. The damper is placed in 2 modes: the first mode of air suction inside the cabin and the second mode of air suction inside the elevator shaft channel and directing the air out of the cabin to the sides of the elevator shaft. The control of the damper mode is done by the smart board.

[Claim 12] According to claim 2, The main fan of the device is a silent and low- vibration fan that has the task of sucking air from the elevator cabin or channel and directing it into the elevator cabin. An oxygen capsule equipped with an electronic valve is installed in the device so that the oxygen gas outlet pipe is placed next to the main fan blower chamber. If the oxygen inside the cabin and the elevator pit channel is less than the set limit, the smart board will open the electronic valve until the percentage of oxygen reaches the minimum set level.

[Claim 13] According to claim 1 ,

A. In normal mode:

When a person (persons) enters the elevator, it is detected by the motion sensor and the following actions are taken immediately:

Temperature measurement:

If the temperature is higher than the set limit, it will turn on the cooling system

Setting up the air circulation fan to pass the air through the filters and purify it.

Measurement of oxygen, smoke, carbon dioxide and inside the elevator cabin and well:

If the air in the elevator shaft is of high quality, the mixing box will be open.

The amount of oxygen, carbon dioxide and smoke in the air is checked:

If the values change abnormally (for example, during a fire), the device removes the smoke and filters the air, and at the same time, oxygen is injected into the cabin. The cabin has detected.

B. During a power outage

The device stays on using its internal battery, but the cooling system goes out of the circuit (due to high electricity consumption) and it is checked whether the cabin is full or empty using a motion sensor.

If the cabin is empty, the device will be in standby mode.

If there were a person or persons in the cabin, the air conditioning fan and one or more light bulbs inside the cabin would turn on.

As long as the motion sensor detects the people inside the cabin, the device checks the air quality inside the cabin and the elevator shaft and performs the necessary operation according to the conditions. If the air conditions inside the cabin are not favorable (the amount of oxygen is lower than the specified limit), a certain amount of oxygen is injected into the cabin.