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Discharge orifice structure of a cp type single screw pump

A single-screw pump and discharge hole technology, used in pumps, pump components, rotary piston pumps, etc., can solve the problems of inability to transport fluid medium, liquid pressure rise, star gear tooth damage, etc., and achieve low vibration, star gear, etc. The effect of less stress and improved efficiency

Active Publication Date: 2018-10-09
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the exhaust orifice on the CP single-screw compressor is used as the discharge orifice of the CP single-screw pump, since the screw groove is closed, there is still a long distance between the working chamber and the orifice in the cylinder circumferential direction, which is trapped. If the liquid in the working chamber cannot be discharged, the phenomenon of trapped liquid will occur, causing the liquid pressure to rise sharply, and the excessively high hydraulic pressure will damage the star gear teeth, making it impossible to realize the function of conveying the fluid medium

Method used

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  • Discharge orifice structure of a cp type single screw pump
  • Discharge orifice structure of a cp type single screw pump
  • Discharge orifice structure of a cp type single screw pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment one: for figure 1 For the CP type single-screw pump, when the conveying medium is a single-phase liquid, or a multi-phase medium containing a gas phase is mixed and there is no need to internally compress the gas phase, such as figure 2 The discharge orifice shown. figure 2 It is the expansion diagram of half a cylinder. It can be seen from the diagram that the discharge port is composed of four space curves of ab, bc, cd and da. Point e is the intersection point with the cylinder when the star wheel engages the screw. The ab curve is a part of the arc generated by point e moving along the cylinder surface circumferential direction. The bc curve is a part of the space curve that coincides with the closed helix on the front side of the tooth on the cylinder. The da curve is a straight line close to the neutral plane of the cylinder and the distance from the neutral plane of the cylinder is h. The cd curve is the connecting line between point c and point ...

Embodiment 2

[0052] Embodiment two: for figure 1 For the CP type single screw pump, when the multiphase medium containing the gas phase is mixed and the gas phase needs to be internally compressed to improve the pump efficiency, such as image 3 The discharge orifice shown. image 3 It is an expanded view of half a cylinder. It can be seen from the figure that the discharge port is composed of four space curves a'b', b'c', c'd' and d'a'. Point a' must coincide with point a, curve a'b' must coincide with curve ab and point b' is between point a and point b. The d'a' curve is a straight line close to the cylinder neutral plane 4 and the distance from the cylinder neutral plane is h. The b'c'curve is parallel to the bc curve, and the c'd'curve is the connecting line between point c and point d, which develops into a straight line along the cylinder. established as image 3 The coordinate system shown, the equation for the discharge orifice is obtained:

[0053]

[0054] The coordinate...

Embodiment 3

[0056] Embodiment three: for figure 1 For the CP type single screw pump, when the multiphase medium containing the gas phase is mixed and the gas phase needs to be internally compressed to improve the pump efficiency, such as Figure 4 The discharge orifice shown. Figure 4 It is an expanded view of half a cylinder. As can be seen from the figure, the discharge port is composed of four sections of space curves a "b", b "c", c "d", and d "a". Point a" must coincide with point a, curve a"b" must coincide with curve ab and point b" is between point a and point b. The d"a" curve is a straight line close to the cylinder neutral plane 4 and the distance from the cylinder neutral plane 4 is h. The b "c" curve is parallel to the d"a" curve, and the c"d" curve is the connecting line between the c" point and the d" point, which develops into a straight line along the cylinder. a "b" c "d" is developed into a standard rectangle along the cylinder. established as Figure 4 The coordi...

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Abstract

The invention discloses a discharge hole structure of a CP type single-screw pump. A discharge hole is formed in the inner wall of a cylinder. The contour of the open end of the discharge hole is composed of a space curve ab, a space curve bc, a space curve cd and a space curve da, wherein suppose that a point e is the intersection point between a star gear and the cylinder when the star gear is disengaged from a screw, the curve ab is part of an arc generated after the point e moves along the surface of the cylinder in the circumferential direction; a tooth crest helical line, close to the front sides of star gear teeth, of the screw is defined as a tooth front-side sealing helical line when the star gear teeth seal a screw groove; the curve bc is part of a space curve, overlapping with the tooth front-side sealing helical line, on the cylinder, and a point b and a point c overlap under the limit condition; the curve da is a curve close to the neutral surface of the cylinder; and the curve cd is the connecting line between the point c and a point d and is a single-section or multi-section curve in any shapes, the curve cd does not exceed the tooth front-side sealing helical line, otherwise, punchthrough from the high-pressure side to the low-pressure side can be caused. The discharge hole structure of the CP type single-screw pump has the advantages of being small in size, large in flow, high in lift, good in mechanical balance performance and the like.

Description

Technical field: [0001] The invention relates to a CP type single screw pump, in particular to a discharge orifice structure of the CP type single screw pump. Background technique: [0002] The screw pump is a rotary pump that relies on the volume change and movement of the meshing space formed by the pump body and the screw to transport or pressurize the fluid medium. The screw pump has the characteristics of small size, high efficiency and high lift, and has self-priming function. It is a constant flow pump, and the flow rate is proportional to the speed. Screw pumps include single screw pumps, twin screw pumps, triple screw pumps, etc. A single screw pump usually refers to a positive displacement pump in which a single screw rotates in an internal thread groove of the pump body to drive a fluid medium. In the existing literature (patent number: WO82 / 03428), the CP single-screw machine widely used in the field of compressors is applied to the field of pumps, and a CP-typ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C15/06F04C2/107
CPCF04C2/107F04C15/06
Inventor 李挺陈帝伊冯全科江伟王斌王玉川
Owner NORTHWEST A & F UNIV
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