摘要:
A header plate (20) is provided for receiving the flattened tubes (14) of a heat exchanger. The header plate (20) includes a plurality of tube receiving openings (26), with each of the openings being surrounded by a flange or collar (28) that extends from a base wall (24) of the header plate (20) towards the heat exchanger core (12) to surround the exterior cross section of the associated tube (14). Each of the flanges (28) is shaped to conform to the exterior of the associated tube (14), and a blend radius R is provided at the interface between the base wall (24) and the flange (28). The blend radius R has a size that increases from a radius R1 central to the length of a long side wall (30) of the flange (28) to a radius R2 central to the length of a short side wall (32) of the flange (28).
摘要:
Difficulties in obtaining consistent bonds of high quality between side pieces and tubular headers (10), (12) in heat exchangers are avoided in a side piece (42) that extends between the headers (10), (12) and which has circular recesses (48) at each end (44), (46). The recesses (48) define resilient fingers (56), (58) which may separate to receive the ends of the headers (10), (12) and frictionally grasp the same, eliminating the need for fixturing at this location and assuring a strong consistent gripping of the headers (10), (12), by the end piece (42) to assure consistent bonds of high quality.
摘要:
Wireless communication systems (100, 800) comprise mobile units (118, 802) provided with a directional coupler (206) and circuit (220) for measuring the complex reflectance (phase and magnitude) of antenna (202) of the mobile units (118, 802). The system (100, 800) has, either in the mobile unit (118, 802) or elsewhere, a processor (238, 808) programmed to perform pattern recognition of the near field environments of the mobile units (118, 802) by using the complex reflectance measurements as feature vectors. Information as to the near field environment at the time of wireless connection drops is suitably accumulated and is used in network upgrade planning and/or mobile unit design evaluation. The complex reflectance is alternatively used to discriminate antenna faults. Alternatively, near field environments that tend to degrade wireless communication performance are detected by the mobile unit using the complex reflectance and the mobile unit then alerts the user.
摘要:
A heat exchanger (10) is provided and in a highly preferred form is an EGR cooler (52) having first and second passes (56A,56B) that are connected to an inlet/outlet manifold (70) by a pair of corresponding thermal expansion joints (87,93) to allow differential thermal expansion between the various structural components of the heat exchanger (10).
摘要:
A heat exchanger and mount isolation system (10) is provided and includes a heat exchanger (12) for a vehicular application, a pair of side frame members (14,16) for mounting the heat exchanger (12) to a vehicle, and four pairs (18) of isolation mount assemblies (19) for mounting the heat exchanger (12) to the side frame members (14,16). The mount assemblies (19) are received in mounting bores (30) that are integral parts of the heat exchanger (12). Each of the pair 18 of mount assemblies (19) is inserted into the opposite ends (32,34) of a corresponding one of the mount bores (30) and includes a pair of abutting metal sleeves (42) that are mounted in respective annular flanged isolators (40).
摘要:
A heat exchanger (10) is provided and in a highly preferred form is an EGR cooler (52) having first and second passes (56A,56B) that are connected to an inlet/outlet manifold (70) by a pair of corresponding thermal expansion joints (87,93) to allow differential thermal expansion between the various structural components of the heat exchanger (10).
摘要:
A heat exchanger and mount isolation system (10) is provided and includes a heat exchanger (12) for a vehicular application, a pair of side frame members (14,16) for mounting the heat exchanger (12) to a vehicle, and four pairs (18) of isolation mount assemblies (19) for mounting the heat exchanger (12) to the side frame members (14,16). The mount assemblies (19) are received in mounting bores (30) that are integral parts of the heat exchanger (12). Each of the pair 18 of mount assemblies (19) is inserted into the opposite ends (32,34) of a corresponding one of the mount bores (30) and includes a pair of abutting metal sleeves (42) that are mounted in respective annular flanged isolators (40).
摘要:
A tank to header attachment construction for heat exchangers include T-shaped tabs on the header which extend through slots in a flange on a tank. The top bar of each tab has it ends bent out of alignment with the slot to secure the tank to the header.
摘要:
A first coil (110) resonant at a first frequency, and a second coil (120) resonant at a second frequency, coupled to a conductive straight portion (140) of an antenna element (130) to form a multi-band antenna structure. The first and second coils (110) and (120) are preferably of different axial lengths and circumferences, wound in opposite directions and coaxially disposed about the antenna element (130). Additional coils can be added to accommodate additional bands and an upper coils (150) can be used to realize a multi-position structure.
摘要:
Multiple helical coils (110, 120, 130) are placed side-by-side and coupled to a conductive straight portion (140) of an antenna to provide a multi-band antenna structure. The helical coils (110, 120, 130) are distanced from one another to sufficiently eliminate coupling interference therebetween. A portable radio capable of communication in many different frequency bands utilizing a single, compact antenna structure is thus realized.