69results about How to "Difficult to conduct" patented technology

The invention discloses a novel airflow preheating device, which comprises a heating pipe and a stream guidance pipe, wherein the upper end of an opening at the lower end of the stream guidance pipe is sealed, both the upper end and the lower end of the heating pipe are opened; the stream guidance pipe is nested in the heating pipe; a spiral stream guidance blade is arranged on the outer wall of the stream guidance pipe; an airflow hole is formed in the wall of the lower end of the stream guidance pipe; a ventilation pipe is arranged inside the stream guidance pipe; the ventilation pipe is a hollow pipe which is provided with openings at both ends; the outer diameter of the ventilation pipe is less than the inner diameter of the stream guidance pipe, so that an airflow space is formed between the outer wall of the ventilation pipe and the inner wall of the stream guidance pipe; the maximum outer diameter of the spiral stream guidance blade on the outer wall of the stream guidance pipe is less than or equal to the inner diameter of the heating pipe; the ventilation pipe is supplied with air from lower end; an airflow enters the region between the inner wall of the stream guidance pipe and the outer wall of the ventilation pipe from the top end of the ventilation pipe, then enters a space formed between the outer wall of the stream guidance pipe and the inner wall of the heating pipe through the airflow hole in the wall of the stream guidance pipe and the airflow, guided by the spiral stream guidance blade, flows out from the top end of the stream guidance pipe from bottom to top. The airflow preheating device disclosed by the invention, by virtue of an optimized airflow passage, can avoid easy heating of the outer wall of an electronic cigarette.

In the ion storage device 10 according to the present invention, an LC resonant circuit 40 for generating an RF voltage for trapping ions is connected to at least one of the electrodes 11, 12 and 13 surrounding the ion storing space 14. The LC resonant circuit 40 includes switching devices 46, 47 and resistances 48, 49 for stopping the RF voltage when the ions stored in the ion storing space 14 are ejected. The inductance L, the capacitance C and the resistance R of the LC resonant circuit are set to substantially satisfy the critical damping condition, which means that R=X / 2 where X=ω0L=(ω0C)−1. According to this configuration, the RF voltage damps fast when the RF voltage is stopped by the switching devices 46, 47, and the deterioration of the mass resolution of the mass analyzer or the peak shift in the mass spectrum is prevented.

The invention discloses a dehumidifying storage cabinet, which is provided with at least one storage unit. Each storage unit comprises a plurality of plate base units used for encircling to form a holding space, and at least one plate base unit is platy integrally, and is provided with an electro-heating plate which is driven by an external power source to radiate heat energy to the holding spaces at least. The electro-heating plates are carbon fiber heating plates preferably. Metal plates with through holes can be stacked on a surface, which faces to the corresponding holding space, of each electro-heating plate at intervals, and a heat-insulation plate can be arranged on a surface, which is opposite to the corresponding holding space, of each electro-heating plate. The dehumidifying storage cabinet has the advantages of small occupied space, simple structure, low power consumption, good dehumidification effect, convenience in control and the like, and is suitable to be used as a household wardrobe.

A cooling structure for an electric motor includes: a motor case that houses a stator and a rotor therein, a groove opened on an end surface in an axis direction of the rotor being formed in the motor case; a motor control circuit attached to the motor case; and a terminal base that closes the groove to constitute the groove as a cooling water passage through which cooling water can flow, the terminal base connecting a power line of the motor to a power line of the motor control circuit.

The present invention provides a tunnel-effect type magnetoresistive head (120) which can prevent degradation of a tunnel-effect type magnetoresistive effect element caused by contact with a magnetic recording medium without degrading a shielding effect. In this tunnel-effect type magnetoresistive head (120), for the above purpose, an exposed surface area of a shield and electrode layer, which is viewed from an air bearing surface, is decreased, and a shield layer is also provided outside the shield and electrode layer.

A butenedioic acid monoalkyl ester-copolymerized acrylic elastomer containing 0.1-30% by mole of unreacted butenedioic acid monoalkyl ester on the basis of carboxyl groups copolymerized in the acrylic elastomer or its cross-linkable composition. The cross-linkable composition can give cross-linking products having distinguished vulcanization characteristics and stably showing good compression set characteristics.

The invention relates to a power semiconductor device anti-single particle burning method which is characterized in that a power semiconductor device drift region is evenly divided into two to four regions according to the transverse thickness, and minority carrier lifetime is shortened aiming to one of the regions; the power semiconductor device drift region is evenly divided into two to four regions according to the longitudinal thickness, and the minority carrier lifetime is shortened aiming to one of the regions.

The invention discloses a crystal melting device for honey. A heating and cooling assembly and a stirring assembly are arranged in a tank body; the heating and cooling assembly is made of a helically coiled pipeline to form a hollow cylindrical body; a space is formed between every two adjacent up-down layers of the pipeline to form pipeline spacing layers; the head part and the tail part of the pipeline extend out of the tank body; a first valve assembly is arranged on the head part of the pipeline so that the pipeline simultaneously communicates with an external high-temperature medium source and an external cooling medium source to enable high-temperature mediums to enter the pipeline during crystal melting / or enable cooling mediums to enter the pipeline after crystal melting; a space is reserved between the heating and cooling assembly and the inner wall surface of the tank body to form an outer chamber; a hollow part of the heating and cooling assembly forms an inner chamber; and the stirring assembly enables the honey to flow back and forth between the inner chamber and the outer chamber through the pipeline spacing layers to achieve rapid uniform crystal melting or rapid uniform cooling. The crystal melting device disclosed by the invention has the advantages of being simple and compact in structure, high in degree of intelligence, easy in operation and maintenance, and high in crystal melting efficiency, and the honey quality can be effectively guaranteed.