Please select the most similar patent number from A, B, C and D. Which number is?
A fully encapsulating one-way circulation ventilation type protective clothing, comprising a conjoined garment (1). A head sheath (2) is provided at the top of the conjoined garment (1). Gloves (4) are provided at the bottom of arms on both sides of the conjoined garment (1). A sealing zipper (5) is inclinedly provided on the left side of the front surface of the conjoined garment (1). A transparent mask (6) is provided on the front surface of the head sheath (2). The protective clothing is further provided with a flat air inlet (8), an air inlet hose (9), an automatic exhaust valve (10), a mute exhaust pump (11), and a mute oxygen-enriched air supply pump (20). The protective clothing is communicated with the outside by means of air intake and exhaust, and the mute exhaust pump (11) and the automatic exhaust valve (10) form a one-way channel where a gas flows outwards. By means of the mutual cooperation between an antivirus filtering net (12) and an antivirus filtering cover (19), viruses can be prevented from entering the protective clothing while effectively supplying oxygen, and the problems of oxygen deficit and hypoxia due to the fact that medical staffs wear the protective clothing are effectively solved.
A: Provided is an inflator pump using a cone valve, comprising a pump body (1), an air inlet and outlet valve plate (2), and an air inlet and outlet end panel (3). A piston rod (6) able to move up and down is arranged vertically inside the pump body (1). An eccentric wheel (5) is mounted in an inner mounting hole in the upper end of the piston rod (6) and a leather cup (7) is mounted at the lower end of the piston rod (6). The air inlet and outlet valve plate (2) is mounted at the lower end of the pump body (1), and several air inlet holes (14) and air outlet holes (13) are uniformly arranged respectively at the peripheries of two through-holes provided in the air inlet and outlet valve plate (2). A conical air inlet valve slot (12) is arranged on the upper end of the air inlet hole (14), and an air inlet valve (10) is mounted in the air inlet valve slot (12). A conical air outlet valve slot (11) is arranged on the lower end of the air outlet hole (13), and an air outlet valve (9) is mounted in the air outlet valve slot (11). An air outlet connecting tube (4) in communication with an air outlet chamber (16) is mounted in a sidewall of the air inlet and outlet end panel (3). The inflator pump uses the cone valve. Since the valve is cocked at the periphery, after entry or discharge of air, the elasticity of the valve is used to seal the air inlet hole (14) and the air outlet hole (13) quickly so that the return of high-pressure air is effectively prevented, thus ensuring that the direct-driven inflator pump can be started under high pressure.
B: A portable automatic tourniquet (100) comprising a cuff (1). A gas intake valve (10) is provided on the outer surface (12) of the cuff (1). The gas intake valve (10) is connected to a gas pressure control apparatus (3) via a gas intake tube (4). A gas pressure sensor (13) is provided on the inner surface (11) of the cuff (1). A gas inlet (35) and a gas outlet (36) are provided on the gas pressure control apparatus (3). The gas pressure control apparatus (3) comprises a microcontroller (30) and a miniature gas pump (33). The gas pressure sensor (13) is used for detecting the gas pressure in the cuff (1). The microcontroller (30) is used for controlling, on the basis of the gas pressure in the cuff (1), the miniature gas pump (33) to draw a gas via the gas inlet (35) to inflate the cuff (1) or controlling the miniature gas pump (33) to discharge the gas in the cuff (1) via the gas outlet (36) to automatically regulate the pressure that the cuff (1) applies to a wound surface for bleeding control of the wound surface. The apparatus (100) effectively prevents ischemic necrosis of muscle tissues at the wound surface due to excessive bleeding control pressure being applied by the cuff (1) to the wound surface and poor bleeding control effects due to insufficient bleeding control pressure being applied to the wound surface.
C: A positive-pressure respiratory droplet-free protective clothing, comprising a large-volume protective clothing body (100) sleeved on the upper body and the head of a human body, and further comprising a filter head (200) and an air supply device (300). The filter head (200) is connected to the air supply device (300), and the air supply device (300) is communicated with the large-volume protective clothing body (100) by means of a pipeline (400); the lower end of the large-volume protective clothing body (100) is provided with a first through hole (110) and two second through holes (120); the two second through holes (120) are respectively formed on two sides of the first through hole (110); the first through hole (110) allows for passthrough of the upper body of the human body, and the second through holes (120) allow for passthrough of the human hands; the large-volume protective clothing body (100) is further provided with two reverse gloves (130) facing towards the large-volume protective clothing body (100), and the reverse gloves (130) are respectively formed in front of the upper body of the human body. After a user wears the positive-pressure respiratory droplet-free protective clothing, the user can take food and drink water and the like in a clean air environment; moreover, the large-volume protective clothing body (100) has a large enough space to provide the user with adequate oxygen for breathing and air-exchange, and heat dissipation and better use experience is realized.
D: A wind-powered air compression apparatus comprising a windmill, an elliptic cam (2), a cylindrical container (4), a protruding component (16), a piston (5), a flexible component (8), and an air storage container (6). The windmill and the elliptic cam (2) are fixedly connected. A rotary shaft (4) of the windmill runs perpendicularly through the center of the elliptic cam (2). The cylindrical container (4) is provided at the bottom part thereof with an air inlet and an air outlet. The air inlet is provided with a one-way air inlet valve (9). The air outlet is provided with a one-way air outlet valve (10). The protruding component (16) is fixedly connected to the upper part of the piston (5). The piston (5) is arranged within the cylindrical container (4) and is connected to the bottom part of the cylindrical container (4) via the flexible component (8). The cylindrical container (4) is connected to the air storage container (6) by means of an air duct via the air outlet. The apparatus is capable of converting wind power into air power that can be stored and transported over long distances.
Answer: C