Please select the most similar patent number from A, B, C and D. Which number is?
A wearable three-chamber negative oxygen ion breathing apparatus comprises a breathing chamber (1), an air inlet device disposed on one side of the breathing chamber (1) and an air outlet chamber (2) disposed on the other side of the breathing chamber (1). The air outlet chamber is in communication with the outside. The interior part of the air inlet device is in communication with the interior part of the breathing chamber (1) via a one-way air inlet valve. The interior part of the air outlet chamber (2) is in communication with the interior part of the breathing chamber (1) via a one-way air outlet valve. Respective sides of the air outlet chamber (2) are provided with a wearing mechanism. The air inlet device is provided with an air purifying negative oxygen ion generating device having a negative oxygen ion emitter (3) extending into a purifying chamber (4). The air purifying negative oxygen ion generating device is connected to a battery (5) via a cable. One side of the purifying chamber (4) is provided with an air inlet (6) in communication with the outside. The structural design of the wearable three-chamber negative oxygen ion breathing apparatus is reasonable, in that the air inlet device provides a dedicated one-way air inlet pathway, and the air outlet chamber provides an one-way air outlet pathway, providing low breathing resistance, allowing easy breathing and preventing exhaust gas accumulation. A large quantity of negative oxygen ions generated in the purifying chamber purifies air, kills bacteria and has a good air purifying effect.
A: Provided is a snorkeling mask with a breathing system, including a mask (1) and a breathing tube (2) located above the mask (1), wherein the mask (1) includes a panel (3) and a wrapping part (4) engaged with the panel (3), a breathing cavity (5) is formed between the wrapping part (4) and the panel (3), the breathing tube (2) is provided with an air intake tube (21) through the mask (1) to the breathing cavity (5), the wrapping part (4) includes a surface support part (41) and a breathing part (42), the breathing part (42) is provided with an inhalation device (6) and a mouth exhalation device (7), at least one one-way air intake valve (61) is provided on the inhalation device (6), the mouth exhalation device (7) is provided with a one-way air outlet valve (71) connected to the panel (3), an exhaust passage (8) is provided on the panel (3) corresponding to the position of the one-way air outlet valve (71) extending outside the mask (1), and the exhaust passage (8) is covered by a breathing cover (9). The snorkeling mask has stable exhaust, and simplifies the structure of the breathing tube, simultaneously minimizes the exhaust passage, the exhaust gas is finally discharged through both sides of the mouth part, so that the exhaust gas discharged does not affect the visual field, and the ventilation is directly and quickly completed.
B: A vehicle-mounted electrostatic air purifying apparatus and a purifier, comprising: a housing (1) and an ion generator (2) which is provided inside of the housing (1); an anion emitting head (3) and a cation emitting head (4) which are electrically connected to the ion generator (2) are provided on the surface of the housing (1); a direct current power source assembly (5) which is connected to an input end of the ion generator (2) is provided inside of the housing (1), wherein the direct current power source assembly (5) has a built-in static electricity isolation power source, and an input end of the direct current power source assembly (5) is also connected to a power supply interface. Negative oxygen ions generated by the anion emitting head (3) may effectively purify hazardous dust particles smaller than a size equivalent to PM2.5 from air inside of a vehicle, which complements a built-in filter system in the vehicle to further purify the air inside of the vehicle, and protect the health of people in the vehicle. While generating anions, the static electricity isolation power source may effectively reduce damage that accompanies generated static electricity that is done to an internal circuit board and elements of the product and thus the electrical circuitry of the vehicle so as to ensure the operational stability of the product and the quality of the product.
C: Glasses for breathing purified air, said glasses comprising two air filters, a left air filter and a right air filter, two side air delivery tubes (11, 12), a left side air delivery tube and a right side air delivery tube, an air curtain jetting and air delivery device, and a dual-eye protective cover, the left and right air filters each comprising a filter housing, a composite filtering layer, a built-in air sensor, a smart sensing chip, a dual-channel variable turbofan (13), a micro-motor (17), a battery (14), a power source control switch (15), and a lower portion air delivery conversion connection port. The air curtain jetting and air delivery device forms an air curtain separation layer A by jetting from within upper and lower air curtain air outlet grooves (31, 32) and two breathing air delivery holes (33), surrounding unclean air is blocked, and a large amount of the clean air jetted from within the two breathing air delivery holes (33) is for a user to breathe. A portable external air filter (50) is arranged for a long-time wearing mode. The face is not covered much during use, and facial expressions are not affected during exchanges. Unclean air may be separated for a short time and a long time, reducing the amount of dust, smoke, plant pollen, bacteria, fine particles etc. inhaled into the body, and preventing air-born infectious diseases.
D: A method and device for producing negative oxygen ions, and a method and device for purifying air, the method for producing negative oxygen ions comprising: introducing air and water into an air-water reactor to enable the introduced air and water to achieve a relative velocity of more than 20 m/s and react within the reactor to produce negative oxygen ions; and after reacting, separating the air containing the negative oxygen ions from the water, and releasing the air containing the negative oxygen ions to the required space. The method and device can produce a large quantity of negative oxygen ions and purified air with high efficiency at low cost, without producing ozone, nitric oxide and other harmful substances, and is long-acting and free of maintenance.
Answer: C