32results about How to "Balanced differential pressure" patented technology

The invention provides an oil gas water well universal type positive cycle type high-efficiency inner bailing combination tool. The oil gas water well universal type positive cycle type high-efficiency inner bailing combination tool comprises a first valve body, an upper through hole is formed at the top end of the first valve body and a lower through hole is formed at the bottom end of the first valve body, and the side walls opposite to each other in the first valve body are provided with a sand-carrying fluid outlet hole which is communicated with the lower through hole and the outside, and a power fluid outlet hole which is communicated with the upper through hole and the outside; at least one rubber cup with an opening facing downward is fixed on the first valve body, and the rubber cups are arranged between the upper portion of the power fluid outlet hole and the lower portion of the sand-carrying fluid outlet hole; The oil gas water well universal type positive cycle type high-efficiency inner bailing combination tool further comprises a second valve body, an upper through hole is formed at the top end of the second valve body and a lower through hole is formed at the bottom end of the second valve body, and the side walls opposite to each other in the second valve body are provided with a sand-carrying fluid inlet hole which is communicated with the lower through hole and the outside, and a power fluid inlet hole which is communicated with the upper through hole and the outside; at least one rubber cup with an opening facing upward is fixed on the second valve body, and the rubber cups are arranged between the upper portion of the power fluid outlet hole and the lower portion of the sand-carrying fluid outlet hole.

The invention discloses a hydraulic-hydraumatic comprehensive driving axle gear box body for a high-speed railway maintaining vehicle. The hydraulic-hydraumatic comprehensive driving axle gear box body comprises a box cover, an upper box body and a lower box body, wherein a motor mounting flange base, a motor input spline shaft bearing base, an input gear shaft bearing base, a middle shaft bearing base and an output shaft bearing base are arranged on the box body; the box body is provided with an upper subdivision part and a lower subdivision part; the motor mounting flange base, the motor input spline shaft bearing base and the input gear shaft bearing base have the same first central axis; the first central axis is located on the upper subdivision part; a second central axis of the middle shaft bearing base and a third central axis of the output shaft bearing base are respectively located on the lower subdivision part and are vertical to each other; the first central axis and the second central axis of the middle shaft bearing base are parallel to each other; the first central axis is deviated from the second central axis for a distance S; the deviating direction is away from one side of a pull arm mounting base. The hydraulic-hydraumatic comprehensive driving axle gear box body has the advantages of compact structure, small volume, reasonable layout and easiness in manufacturing and maintaining.

The invention discloses a spindle sealing system for a motor working under a high-temperature or high-pressure environment, which belongs to the technical field of motor equipment. The spindle sealing system comprises a first connector and a second connector; the first connector is connected with a motor housing; the second connector is connected with a spindle, and the first connector and the second connector are connected through screw threads. The spindle sealing system is characterized in that a piston rod sleeves the spindle; the piston rod is connected with a piston; one end of the first connector is connected with a piston end cover; the other end of the first connector is connected with a first sealing element; the second connector is connected with the spindle through a second sealing element; a transitional cavity is defined by the first connector, the second connector and the spindle; an internal cavity is defined by the motor housing, the spindle and the piston end cover; the first connector is provided with a first pressure balance hole, and the piston end cover is provided with a second pressure balance hole. Because the pressure difference between sealing is balanced by the piston, the sealing can work under a zero-pressure-difference environment, consequently, the sealing reliability is improved, and the stable operation of the motor under the high-temperature or high-pressure environment can be ensured.

The invention relates to the technical field of radar equipment, in particular to a welded air tube secondary radar antenna box. The antenna box is formed by welding several segmented boxes in turn, and each segmented box is formed by welding two open ends of U-shaped box plates opposite each other. The antenna box in the invention is formed by tailoring and welding a plurality of sections of thebox body, and each section of the box body is also formed by splicing aluminum alloy plates, replacing the assembly mode of manual riveting, reducing the influence of human factors, and realizing batch production. At the same time, the welding installation method reduces the number of parts and the types of parts, reduces the complexity of installation and shortens the production cycle. In addition, due to the reduction of the number of parts and the types of parts, the phenomenon of wrong installation caused by the use of too many parts is avoided, and the installation accuracy is further improved. Moreover, the reduction in the number of parts reduces the weight of the box and reduces the strength requirements of the mounting base.

The invention discloses a pressure control device and method in a climate laboratory aircraft engine start-up test room. The device comprises a laboratory thermal insulation wall plate, a positive pressure control mechanism and a negative pressure control mechanism. The positive pressure control mechanism and the negative pressure control mechanism both include The air flow channel and the thermal insulation sealing door assembly, the positive pressure control valve is installed in the air flow channel of the positive pressure control mechanism, and the negative pressure control valve is installed in the air flow channel of the negative pressure control mechanism; the method includes: when the aircraft engine start-up test is not carried out The operation process; the operation process before the start-up test of the aircraft engine; the working process of the positive pressure control valve and the negative pressure control valve during the engine start-up test. The invention solves the problem of excessive pressure difference inside and outside the laboratory caused by the mismatch between the compensation air flow and the exhaust emission of the engine during the driving test of the aircraft engine, and can ensure the safety of the driving test of the aircraft engine, with good sealing performance and fast response speed.

The invention discloses a spindle sealing method for a motor working under a high-temperature or high-pressure environment, which belongs to the technical field of motor equipment. The spindle sealing method is characterized in that a piston rod and a piston are first fitted between a motor housing and a spindle, and a piston end cover is fitted; a first sealing element is fitted on a first connector, and a second sealing element is fitted between a second connector and the spindle; the first connector is connected with the motor housing, the second connector is connected with the first connector, a transitional cavity is formed by the first connector, the second connector and the spindle, an internal cavity is formed by the motor housing, the spindle and the piston end cover, a first pressure balance hole is formed in the first connector, a second pressure balance hole is formed in the piston end cover, and the pressure balance between the transitional cavity and the internal cavity is regulated by means of the motion of the piston. Double sealing is adopted by the invention, the stable operation of the motor can be effectively ensured by the piston balancing the pressure difference between sealing, and the sealing method is simple and reliable.

The embodiment of the present invention provides a multi-connected air conditioner pressure difference balancing method, device and multi-connected air conditioner, which belong to the technical field of air conditioning. The multi-connected air conditioner pressure difference balancing method includes the following two steps: receiving a shutdown command; The operation status of the multi-connected air conditioner controls the opening degree of the electronic expansion valve of the multi-connected air conditioner, so as to increase the speed of differential pressure balance after the multi-connected air conditioner stops. The multi-connected air conditioner includes an outdoor unit and multiple indoor units. The outdoor unit and each indoor unit are equipped with a controller and an electronic expansion valve communicating with the controller. The controller of the outdoor unit or any indoor unit has a built-in multi-connected air conditioner pressure The differential balance device is used to control the multi-connected air conditioner to execute the two steps of the above-mentioned multi-connected air conditioner differential pressure balancing method. The multi-connected air conditioner and its pressure difference balancing method and device can simplify the pipeline structure of the multi-connected air conditioner, improve production efficiency and reduce production cost.