30results about How to "Guaranteed inner diameter" patented technology

A light emitting container comprising a trunk unit for forming a discharge space and a terminal unit into which an electrode member is inserted, both units being integrally formed from a transparent ceramic material, wherein at least the middle region of the trunk unit is smaller in wall thickness than the terminal unit and the boundary region between the terminal unit and the trunk unit and the inner diameter of the terminal unit is about 2 mm or smaller.

The invention discloses a downhole hollow oil well pump. The downhole hollow oil well pump comprises a barrel body, wherein a hollow piston rod anchored down a well is arranged inside the barrel body; an upstream end of the piston rod is closed; a downstream end of the piston rod is provided with a well fluid inlet; a sealing sleeve fixed to the barrel body sleeves the piston rod; the sealing sleeve and a sealing structure of the piston rod divide an inner cavity of the barrel body into an upper chamber, a middle sealing chamber and a lower chamber; first oil introduction holes connected with the middle sealing chamber are formed in the side wall of the piston rod; the first oil introduction holes are coated with first elastic sealing parts; second oil introduction holes connected with the middle sealing chamber and a space outside the barrel body are formed in the sealing sleeve; and the second oil introduction holes are coated with second elastic sealing parts. According to the downhole hollow oil well pump, simulated production can be achieved, a stable working condition is reached, a testing tool is controlled through lifting and putting down a continuous oil pipe to test capacity conditions of all layers, a good sealing property is achieved, inner diameters are sufficiently guaranteed under the condition that outer diameters are the same, and the downhole hollow oil well pump is particularly applicable to production testing of high-inclination wells and horizontal wells.

The invention relates to equipment for producing a water hose, which comprises an outer forming die, an inner last die, an extruder and nip rolls matched in pairs up and down, wherein the extruder is provided with an extruder head; the outer forming die, the inner last die, the extruder head and the nip rolls are arranged from the back to front in turn; the shape of the cross section of the outerforming die comprises two up and down horizontal U-shaped outer sleeves; the upper wing of the upper U-shaped outer sleeve and the lower wing of the lower U-shaped outer sleeve are integrated into a whole through a side plate; and the shape of the cross section of the inner last die comprises an upper horizontal transverse plate and a lower horizontal transverse plate, an upper vertical plate anda lower vertical plate. The invention also provides a process for producing the water hose. The equipment and the process can improve the speed of the water hose production, have simple and ingeniousequipment structure, and easy processing technique and operation, and ensure the accurate inside diameter of the water hose.

The invention provides a punching head, which comprises an expanding mold core (10) and a reducing jacket (30), wherein the first end of the expanding mold core (10) is an expanding end (11) and the second end of the expanding mold core (10) is a connecting end; and the expanding mold core (10) is installed in the inner hole of the reducing jacket (30), the first end of the reducing jacket (30) is a reducing end (31), and a gap is kept between the reducing end (31) and the expanding end (11). The punching head has the advantages of high production accuracy, simple production process and high efficiency.