38results about How to "Small cavity volume" patented technology

The invention discloses a plunger type fracturing pump and an oil fracturing vehicle. The fracturing pump includes a pump head body and a reciprocating plunger body, the plunger body includes: a first plunger, the end of the first plunger is arranged in the pump head body, the The first plunger includes a first inner hole in the axial direction; a second plunger, the second plunger is arranged in the first inner hole of the first plunger; a mounting part, the installation part is arranged in the Between the first plunger and the second plunger, it is used to fasten or disengage the first plunger and the second plunger. The present invention can provide delivery of different pressures and displacements without replacing the plunger and the pump head body, has high pumping efficiency, simple structure, convenient assembly and disassembly, and low cost.

The invention discloses an online fault diagnosis method and a device for a secondary suspension air spring system. The method comprises the following steps: 1) when the air spring is subjected to a load force, deformation parameters of the air spring are acquired and according to the deformation parameters, a pressure-stiffness model for the air spring is built, wherein the deformation parameters comprise a spring height, an effective bearing area and an inner cavity volume; 2) multiple pressure values of the inner pressure of the air spring are acquired, and the multiple pressure values are inputted to the pressure-stiffness model for acquiring a stiffness decay curve of the air spring; 3) according to the stiffness decay curve, a stiffness threshold of the air spring is set; and 4) second stiffness of the air spring is acquired online, the second stiffness and the stiffness threshold are compared, and if the second stiffness is larger than the stiffness threshold, fault happens to the air spring. Defects that fault judgment is carried out on the air spring on the basis of the traditional visual inspection and experience judgment, and thus accuracy is low can be overcome.

The invention discloses a preparation method for a composite sound-absorbing material of an automotive interior trim part, and relates to the technical field of processing of automotive interior trimparts. According to the invention, a soundproofing mat is composed of two layers of soundproofing cotton felts; and the preparation method comprises the following steps: regenerated polyester fiber / polypropylene fiber spinning, hot press molding of a composite felt, premolding of a glass fiber mesh with a steam mold, cooling and molding, water cutting, and packaging and warehousing. The compositesound-absorbing material provided by the invention is prepared by compounding a plurality of layers of a sound-absorbing material, comprises six layers, and has good sound-absorbing effect and compactness and excellent aesthetic properties. The preparation method provided by the invention uses the regenerated polyester fiber and frequently-used polypropylene fiber as raw materials; a fiber composite sheet material applied to automotive interior trim parts is prepared by adopting a method provided by the invention; the regenerated polyester short fiber is a reinforcing body, and the polypropylene fiber is a matrix, so the effects of binding and reinforcing are exerted; and the composite felt prepared by strictly controlling parameters like temperature, time and pressure of a hot press molding machine has excellent mechanical properties.

The invention discloses a metal hard sealing spherical valve, and belongs to the technical field of switching valves for conveying systems. The metal hard sealing spherical valve comprises a guiding track and a spherical valve element, wherein the guiding track is arranged in a valve cavity; the two ends of the guiding track communicate with an inlet flow channel and an outlet flow channel correspondingly; the guiding track comprises a valve seat and a guiding assembly; the valve seat is arranged on one side of the guiding assembly; the middle of a valve element base is arranged in the guidingassembly in the mode that the middle of the valve element base can rotate around the axis of a valve rod component; a valve element flow channel is formed in the middle of the valve element base; a guiding sleeve is arranged on one side of the middle of the valve element base; one side of the spherical valve element is rotationally arranged on the guiding sleeve in the axial direction of the guiding sleeve in a sleeving mode; the guiding sleeve is internally provided with an elastic support component; the edge of one side of the spherical valve element is attached to the guiding assembly; theedge of the other side of the spherical valve element is attached to the valve seat; and the edge of the spherical valve element is of a sharp-knife structure. The metal hard sealing spherical valveprovided by the invention is better in sealing effect, the size of the valve cavity is reduced, the weight is low, and the cost is low.

The invention discloses a method for preparing a carbon nano hollow polyhedron by using a hydrothermal method and belongs to the field of nano graphite preparation. According to the method, a chemicalsynthesis method is utilized, pyrene with a benzene ring structure is taken as a raw material, a reaction is carried out under an alkaline condition and at a relatively low temperature, and a prepared reaction product is high in graphitization degree, the cavity volume is large, and the reaction product has potential characteristics of light weight and high strength. The method is low in energy consumption, short in consumed time and high in product quality, the adopted chemical synthesis method is completely different from the prior art, and innovation and novelty are achieved.

A steady-flow control air pressure balancer relates to the technical field of wind power transmission. It includes an air inlet pipe, an air outlet pipe and a valve body. The valve body is provided with a valve cavity, and both ends of the valve cavity are respectively connected with an air inlet pipe and an air outlet pipe. The rear section of the valve cavity is the first conical diversion section, the front section of the valve cavity is the second conical diversion section, the cylindrical middle section between the first conical diversion section and the second conical diversion section, the valve cavity There is a fluid guide assembly and a fluid guide bracket in the middle; the fluid guide assembly includes a guide body and a cylindrical casing, and an electric cylinder for driving the guide body to move forward and backward is fixedly installed in the cylindrical casing. The width of the gap between the cavity walls of the second conical diversion section can adjust the working wind pressure of the corresponding winding unit; the diversion support includes a strut, the cylindrical shell and the valve body are fixedly connected to the strut, and the strut An air intake channel communicated with the external environment and an exhaust hole communicated with the inner cavity of the cylindrical shell are opened inside.

The invention discloses a stamp forging mould of long and thin forging with upsetting rate more than 3, which comprises an upper die and a lower die, wherein a punch of the upper die is just opposite to a die orifice of the lower die, and is characterized in that the outer circle of the punch is provided with a movable protection jacket, an inner hole of the protection jacket is in slide fit with the outer circle of the punch, the protection jacket is connected with the upper die through an elastic device, and the lower end surface of the protection jacket can be smoothly and closely attached to the plane on which the die orifice of the lower die is arranged when the lower end surface is contacted with the plane. The stamp forging mould adopts a near-net-shape technology; the produced forge piece is basically free from generating rough selvedge, and the utilization rate of the material can reach 99.5 percent, so not only the raw material can be saved, but also the forge piece can be obtained directly through the cold deformation, and the energy can be saved. The technical scheme breaks through the restriction of the one-time forge formation that the upsetting ratio cannot be more than 3. The service life of the mould is long.

The invention discloses a drilling device for releasing the fission gas of heavy water reactor fuel elements, which comprises a frame, on which a sealing seat A (4) is arranged, and a sealing seat A (4) is arranged inside the sealing seat A (4) for installing heavy water reactor fuel elements ( 3) Hole A, seal seat A (4) is connected with gas collection seat (5), pipe fittings (6), seal seat B (7) and electric drill (8) in sequence, and the motor shaft connecting shaft (2) of electric drill (8) ), the shaft (2) is rotatably installed in the shaft hole of the seal seat B (7), the drill bit (1) is fixedly installed on the lower end of the shaft (2), and the drive of the electric drill (8) is fixedly installed on the frame device (9). The beneficial effect of the invention is that the fuel element of the heavy water reactor can be drilled in a highly radioactive environment, and the fission gas can be completely released.