Please select the most similar patent number from A, B, C and D. Which number is?
A housing assembly (100) and a phase changing water heater (1000). The housing assembly (100) comprises: a housing body (10); the housing body (10) comprises a front housing (12) and a rear housing (13) which are connected to each other, and a chamber is formed by means of the front housing (12) and the rear housing (13); a glass plate (14) and a connecting plate (15) are arranged on a front face of the front housing (12), the glass plate (14) being arranged on the connecting plate (15), and a gap structure being arranged between the connecting plate (15) and the front housing (12).
A: Disclosed are an instantaneous electric water heater housing (100) and an instantaneous electric water heater (1000). The instantaneous electric water heater housing (100) comprises: a rear shell (110), a side wall of the rear shell (110) being provided with a projection (111) projecting outwards; and a front shell (120), the front shell (120) being connected to the rear shell (110), and a free end face of the projection (111) bearing against a side wall of the front shell (120).
B: The utility model provides an intelligent mirror waterproof structure. The intelligent mirror waterproof structure comprises a front shell, a rear shell and a connecting line, wherein the front shell and the rear shell are connected to form a waterproof shell, and the connecting line is arranged at the joint between the front shell and the rear shell in a penetrating manner; a sealing strip is arranged between the front shell and the rear shell, the outer wall of the connecting line is movably sleeved with a sealing ring, and the sealing ring is mounted between the connecting line and the waterproof shell. The utility model further provides an intelligent mirror comprising the intelligent mirror waterproof structure. By using the intelligent mirror and the waterproof structure thereof provided in the technical solution of the present utility model, the sealing strip being used between the front shell and the rear shell for sealing, the production cost is reduced, the sealing strip is more convenient to mount, and in turn the man-hours for mounting the sealing strip are reduced, therefore improving the operation efficiency; and the sealing ring is movably arranged on the connecting line, so that the position of the sealing ring can be adjusted as required when the connecting line is mounted, the adjustment is convenient, and the sealing ring is more convenient to mount.
C: An axial piston pump, comprising an end cover (15), a front cover (9), a pump shaft (10) provided within the front cover (9), a back cover (4), a swashplate (17) and a cylinder body (8) installed inside the back cover (4). The end cover (15), the front cover (9), and the back cover (4) and the cylinder body (8) are fixedly connected in sequence. One end of the pump shaft (10) facing away from the cover is connected to swashplate (17). The piston pump is further provided therein with a cross-shaped wobble plate (18) and a piston module (13). The cylinder body (8) is provided therein with a piston hole, a valve hole, a pressing output valve group (12) and a pressing input valve group. The pressing output valve group (12) and the pressing input valve group are disposed within the valve hole. One end of the piston module (13) is inserted in the piston hole, and another end of the piston module (13) is connected to the cross wobble plate. The piston pump, by providing a slipper plate, inserts and integrates a return plate and a slipper, and a slipper and a piston ball head of the prior art, decreasing a lateral force of the cylinder body and piston seat, increasing the tilt angle of a swashplate, increasing the return distance of the piston seat, increasing piston pump displacement, improving piston pump efficiency and further simplifying cylinder body design.
D: An enclosure (1) for use on a bicycle power-boost apparatus, comprising: a front housing (11), a rear housing (20), a fan-shaped plate (16), and an accommodating cavity (21). The front housing (11) and the rear housing (20) are provided with opposite bolt holes (17). Bolts are inserted into the bolt holes (17) to fit together the front housing (11) and the rear housing (20) to define the accommodating cavity (21). The front housing (11) and the rear housing (20) are provided with one or multiple opposite shaft holes (13, 14, and 15). The fan-shaped plate (16) is arranged on top of the front housing (11) and/or of the rear housing (20). The fan-shaped plate (16) is provided thereon with the bolt holes (17). The enclosure (1) is capable of replacing a bicycle five-way fitting and of accommodating complex bicycle power-boost apparatus.
Answer: A