41results about How to "Restrict flow" patented technology

A partition member (42) is installed between a frame (21) and the stator (33) of an electric motor (24). The partition member (42) establishes communication between a connection passage (26) and a gap (39a) and between a gas passage (40) and a delivery space (16). The refrigerant gas delivered from a compression mechanism (22) entirely flows into the gap (39a) and passes through a communication space (15) and then flows through the gas passage (40) so as to be delivered from a delivery pipe (18).

The invention relates to a blisk electrolytic milling machining system and method adopting auxiliary liquid flushing and belongs to the field of electrolytic milling compound machining. The blisk electrolytic milling machining system adopting auxiliary liquid flushing comprises a power source, a tool cathode (1), a main shaft (6), a blisk blank (2), a supporting shaft (5) and an auxiliary spray nozzle (10). The auxiliary spray nozzle (10) is provided with a section identical with a groove to be machined in shape and is right opposite to a to-be-machined face of the blisk blank (2). The tool cathode (1) is located between the auxiliary spray nozzle (1) and the to-be-machined face of the blisk blank (2), and initial intervals are kept between the tool cathode (1) and the auxiliary spray nozzle (1) and the to-be-machined face of the blisk blank (2). During machining, the tool cathode (1) and the auxiliary spray nozzle (10) supply electrolyte to the machining area of the blisk blank (2) atthe same time, and the pressure of the electrolyte in the auxiliary spray nozzle (10) is larger than that of the electrolyte in the tool cathode (1). By the adoption of the liquid flushing-assisted electrolytic milling machining system and method for the blisk, flow of the electrolyte in a machined area can be effectively restrained, the flow field uniformity in the machining intervals is improved, and the electrolytic milling machining efficiency and stability of the blisk are improved.

A grounding system suitable for urban rail transit. The working grounding device is composed of: symmetrical working grounding points are arranged on the left and right sides of the car body, and each working grounding point is electrically connected to switches, carbon brushes and wheel sets in sequence; The grounding device is composed of: symmetrical protective grounding points are arranged on the left and right sides of the car body, and each protective grounding point is electrically connected to the control switch, power diode, grounding carbon brush and wheel set in sequence; the automatic control system is used to regulate the above two grounding points. The current of the device makes the currents on the two rails approximately equal. The protection grounding of the present invention adopts a power diode, which limits the current from flowing into the rail from the car body, avoids the damage of the weak point equipment on the car due to the return flow of the rail, and makes the currents on the two rails equal in size through the automatic control system, which improves the safety of the train sex.

The invention relates to an LDMOS device and a manufacturing method thereof. An LDMOS device comprising a substrate, a drift region on the substrate, the drift region including a source region and a drain region; and a trench surrounding the drift region, the depth of the trench being greater than that of the drift region depth. Because its trench surrounds the drift region, it can limit the hole current in the electron-hole pairs generated by the LDMOS device at high temperature from flowing to the substrate, that is, it can effectively isolate the LDMOS device from the peripheral logic circuit and avoid the occurrence of crosstalk. In addition, a manufacturing method of the LDMOS device is also provided.

The invention discloses a hole-retaining occluder for ventricular septal defect, which comprises a left disk and a right disk for blocking the gap, and a frustum-shaped blocking part located between the left and right disks to block the ventricular septal defect, and the diameter of the frustum-shaped blocking part is relatively small. The large end is connected to the left disk, and the through hole that runs through the above-mentioned left disk, right disk and the frustum-shaped blocking part; the diameter of the left disk is equal to the diameter of the right disk, and the diameter of the left disk is greater than the diameter of the frustum-shaped blocking part; The right disk, the frustum-shaped blocking part and the through hole are all formed by a plurality of memory alloy wires; the memory alloy wire passes through the through hole to form the hole wall of the through hole, and is wound to form the left disk, the right disk and the frustum-shaped blocking part. Both ends of the memory alloy wire are fixed on the same fixture that constrains the memory alloy wire; multiple memory alloy wires are interlaced to form an elastic net, and a sealing film is arranged inside the elastic net. The aortopulmonary artery shunt is limited, and the volume overload and pressure transmission of the pulmonary vessels are reduced, so that the high pressure of the right heart system has room to release.