摘要:
A fin and tube heat exchanger including a plurality of parallely arranged heat transfer tubes and a plurality of plate-shaped fins provided orthogonally to the heat transfer tubes, each of the heat transfer tubes being in contact with fin collars of the plate-shaped fins, and being inserted along the fin collars.Each fin collar is configured such that a bend is provided in each of a re-flared portion and in a root portion of the fin collar and a flat intermediate portion is formed between the bends. A thickness of the re-flared portion is smaller than a thickness of the root portion. A radius of the bend of the re-flared portion is larger than a radius of the bend of the root portion, and a ratio of the radius and the thickness of the bend of the re-flared portion is one half or more of a ratio of the radius and the thickness of the bend of the root portion.
摘要:
A cylinder block plate processing apparatus in which one end side of an inner peripheral surface of a cylinder of a cylinder block is sealed to circulate a process liquid to perform pre-plating or plating processing of the cylinder inner peripheral surface. The apparatus includes: an apparatus body having a workpiece mount table on which the cylinder block is placed; a workpiece holding tool that is provided on the workpiece mount table so as to be vertically movable; an electrode support member including an electrode cylinder mounted to the apparatus body; a processing solution supply member that supplies a processing solution to the electrode support member; an electrode operated by the electrode cylinder; a sealing jig provided to one end of the electrode; a driving mechanism that drives the sealing jig; and a control circuit that controls operations of the processing solution supply member and the driving mechanism. The electrode and the sealing jig are inserted from the other end side of the cylinder inner peripheral surface into the cylinder, and the driving mechanism is inserted from an end side of the inner peripheral surface so as to be connectable to the sealing jig.
摘要:
To obtain a heat transfer tube for a heat exchanger or the like which can obtain predetermined heat transfer performance without increasing in-tube pressure loss.High ridges 22A having 10 to 20 rows with a predetermined height and low ridges 22B with a height lower than the high ridges 22A having 2 to 6 rows between the high ridges 22A and the high ridges 22A are provided on an inner face helically with respect to a tube axial direction.
摘要:
A heat exchanger provided with a plurality of plate-like fins 2 arranged in parallel with a predetermined interval and a plurality of flat-shaped heat transfer pipes 3 inserted in a direction orthogonal to said plate-like fins 2 and through which a refrigerant flows, in which said heat transfer pipe 3 has an outside shape with a flat outer face arranged along an air flow direction and a section substantially in an oval shape and first and second refrigerant flow passages 31a, 31b made of two symmetric and substantially D-shaped through holes having a bulkhead 32 between the two passages inside, which is bonded to said plate-like fin 2 by expanding diameters of said first and second refrigerant flow passages 31a, 31b by a pipe-expanding burette ball.
摘要:
In a clean unit which has a dust filter with a blowing power source on the upper surface of a working chamber and which can maintain a clean environment, an external gas flow passage is directly connected or connected through a partition wall, through which dust particles cannot pass but gas molecules can pass, to a feedback gas flow passage for connecting air-tightly a ventilation hole formed in the wall of the working chamber and the inlet of the dust filter to each other. On both sides of the partition wall, the flow velocity vector of a gas flowing in the feedback gas flow passage is made to be equal to the flow velocity vector of the gas flowing in an external gas flow passage.
摘要:
A sealing jig comes into contact with a cylinder inner peripheral surface as a surface to be processed of a cylinder block and seals the cylinder inner peripheral surface in introducing treatment liquid to the cylinder inner peripheral surface. The sealing jig includes: a sealing member made of an expandable material and having a ring-buoy shape; a lower plate for supporting a lower side of the sealing member; and a seal base disposed so as to face the lower plate and to support an upper side of the sealing member. The sealing member is regulated by the lower plate and the seal base and expanded only in a radial direction to come into contact with the cylinder inner peripheral surface when air is introduced inward.
摘要:
A fracture structure is grown from a plurality of starting points. A fractal structure, grown from respective starting points and interconnected by interactive growths, forms a neural network. A growth speed originated at a specific starting point is determined by the probability of a material reaching a grown portion from a remote location by means of a diffusion process and the probability of a growth promoting factor reaching a grown portion by means of a diffusion process from a portion grown from a starting point other than the specific one. Anisotropy is introduced into a space in which a fractal structure is to be grown, as required.
摘要:
This invention relates to a fiber-made surface fastener comprising joining faces each in which a plurality of fiber-made engaging elements are provided on one surface of each flat base fabric. By specifying a structure and composition yarns of the base fabric of the same surface fastener, the ratio (A/B) of an area A of a range in which sound spectrum of a peeling-off sound Fourier-transformed in a range of 100 Hz to 15000 Hz is 100 Hz to 3000 Hz to an area B of a range in which sound spectrum of a peeling-off sound Fourier-transformed in a range of 100 Hz to 15000 Hz is 3000 Hz to 15000 Hz is 0.4 or more. Consequently, tone of a sound generated when the surface fastener is peeled off and when the surface fastener attached on a product is peeled off is shifted to a low tone side so as to reduce an uncomfortable sound to a lower tone thereby reducing a feeling of discomfort.
摘要:
A semiconductor device exploiting a quantum interference effect is disclosed. The device comprises: a channel region connected multiply with multiplicity of n (n.gtoreq.3) and having (n-1)-fold rotational symmetry around an axis of the channel region; a gate electrode surrounding a side wall of the channel region; and source and drain electrodes electrically connected to one and another end of the channel region along the axis. Electrons move in an effective channel region along or around the axis from the source toward the drain. Electron interference in the effective channel region is controlled by a magnetic field applied in the axis direction and/or the gate electrode.
摘要:
An electrolytically polymerizable macromolecular compound which is advantageously usable as a surface modifier for a polar surface, as a compatibilizing agent for polymer alloys, as an adhesive primer, as an electrochromic substance, etc., a polymerizable monomer to be used for the production thereof, and a method for the production of an electrolytically polymerized film thereof are disclosed. The macromolecular compound has a repeating unit represented by the following general formula (2): ##STR1## wherein R.sub.1 represents a hydrogen atom or an alkyl group, A represents an electrolytically polymerizable group, and B represents a divalent group. This macromolecular compound is obtained by the polymerization of a monomer represented by the following general formula (1): ##STR2##