Please select the most similar patent number from A, B, C and D. Which number is?
A cooling apparatus for casting medium and large-sized propellers, comprising a supercooling box (9); a liquid conveying pipeline (4) which is uniformly distributed in a snakelike array is disposed in the supercooling box; a liquid nitrogen storage tank (2) is disposed above the supercooling box, and the liquid nitrogen storage tank is connected to a liquid nitrogen pump (1), wherein one end of the liquid conveying pipeline communicates with the liquid nitrogen storage tank, and the other end of the liquid conveying pipeline is connected to the liquid nitrogen pump; a plurality of air intake fans (3) are disposed on the right side of the supercooling box, a cooling box (6) is disposed on the left side of the supercooling box, a casting is disposed in the cooling box, and a plurality of exhaust fans (7) are disposed on the left side of the cooling box; a plurality of groups of dustproof filter screens (8) are disposed on the outer sides of the air intake fans and the exhaust fans, and the dustproof filter screens are disposed in slots on a box wall. The described cooling apparatus utilizes liquid nitrogen to efficiently cool castings, and uses detachable dustproof filter screens, which are convenient to replace, can prevent dust from sticking to air intake fans and exhaust fans, and keeps equipment clean, thus preventing obstructions to airflow caused by dust being attached to fan blades.
A: Disclosed in the present invention is a cooling device for machine tool casting production, comprising a cooling table; support pads are fixedly mounted on a lower surface of the cooling table at positions close to two sides, and support frames are fixedly mounted on an upper surface of the cooling table at positions close to the edges at two sides, a support plate is supported on top ends of the support frames, and a water storage tank is fixedly mounted on an upper surface of the support plate, a water pump is provided inside the water storage tank, an output end of the water pump is connected to a delivery pipe, one end of the delivery pipe extends to the outside of the water storage tank, a spray head is connected to one end of the delivery pipe, and support tables are fixedly mounted on outer sides of the support frames, cooling fans are fixedly mounted on upper surfaces of the support tables, and cold air ducts are connected to output ends of the cooling fans. The cooling device for machine tool casting production of the present invention can conveniently push a casting onto a cooling table, and can improve the stability of casting placement.
B: A greenhouse cultivation device employing heat generated by a variable-frequency drive or inverter. The device comprises a greenhouse (1). Several rows of heat dissipation elements (2) and ventilation pipes (3) are buried underground in the greenhouse. The heat dissipation elements are formed by multiple sheet-like radiators (21) connected in series, and each of the radiators is provided with a cooling liquid inlet (211) and a cooling liquid outlet (212). The cooling liquid inlet of a first radiator is connected to a heat generation element of a variable-frequency drive or an inverter via a cooling liquid pipe (4). The cooling liquid outlet of a last radiator is connected to an in-line pump (5) via a cooling liquid pipe. The ventilation pipes have two ends protruding from the ground and located outside of the greenhouse, and have walls extending upward to form several air discharge pipes (32) protruding from the ground and located within the greenhouse. A roof of the greenhouse is provided with a skylight. A temperature sensor is provided within the greenhouse. The device fully utilizes waste heat generated by a heat generation element of a variable-frequency drive or an inverter, thus saving energy for winter cultivation in a greenhouse, and is environmental friendly and energy saving.
C: A greenhouse cultivation system employing heat generated by a variable-frequency drive or inverter. The system comprises a greenhouse (1). Several water channels (2) and ventilation pipes (3) are arranged in parallel and buried underground in the greenhouse. Each of the water channels is secured with a heat dissipation tube (4) therein and provided with a cooling liquid inlet (21) and cooling liquid outlet (22), and the heat dissipation tube has one end fastened to the cooling liquid inlet of said water channel and the other end fastened to the cooling liquid outlet of said water channel. The cooling liquid inlets of the water channels are connected to a heat generation element (6) of a variable-frequency drive or an inverter via a cooling liquid pipe (5), and the cooling liquid outlets of the water channels are connected to an in-line pump (7) via a cooling liquid pipe. The ventilation pipes have two ends protruding from the ground and located outside of the greenhouse, and have walls extending upward to form several air discharge pipes (32) protruding from the ground and located within the greenhouse. A roof of the greenhouse is provided with a skylight. A temperature sensor is provided within the greenhouse. The system fully utilizes waste heat generated by a heat generation element of a variable-frequency drive or an inverter, thus saving energy for winter cultivation in a greenhouse, and is environmental friendly and energy saving.
D: A structure for cooling a cylinder head of a four-stroke engine. Arranged at the center of the cylinder head (1) is a fuel injector sleeve (2). Arranged around the fuel injector sleeve (2) are four valve seats (4) distributed evenly along the circumferential direction. Provided at a bottom face of the cylinder head (1) is a cooling water inlet (1a), which is used for introducing cooling water from a machine body to the cylinder head (1). Arranged within the cylinder head (1) is a cooling water passage (1b) in communication with the cooling water inlet (1a). The cooling water passage (1b) is arranged around the four valve seats (4). Arranged around the fuel injector sleeve (2) is a cooling chamber (1d) used for cooling a fuel injector and an air inlet/outlet passage. The cooling chamber (1d) is arranged above the cooling water passage (1b) and is in communication with the cooling water passage (1b) via a cooling water inlet passage (1c). The cooling water inlet passage (1c) is arranged in proximity around the fuel injector sleeve (2). Provided at a top part of the cooling chamber (1d) is a cooling water outlet (1e) used for discharging the cooling water. The mechanical load and heat load capacities of the cylinder head of the present invention are greatly improved, thus allowing for highly efficient completion of cooling of components of the cylinder head.
Answer: A