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Double cone for generation of a pressure differenceRelated Patent Categories: Pumps, One Fluid Pumped By Contact Or Entrainment With Another, Jet, Specific Motive Fluid NozzleDouble cone for generation of a pressure difference description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060140780, Double cone for generation of a pressure difference. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001] The present invention relates to a double-cone arrangement for creating a pressure difference in a fluid flowing through the double-cone arrangement. Specifically, the present invention deals with a double-cone device that produces enhanced suction and reduced wear and tear. [0002] A double-cone device comprises an entry unit, an exit unit, each of hollow frustroconical shape, and a central section referred to as orifice. When fluid flows through such a device, the orifice section exhibits suction properties. The suction property makes a double-cone device useful for many applications ranging from well pumping to separation processes such as desalination and deionization. The double-cone device is used in these applications for providing pressure amplification to the fluids used in these processes. [0003] The double-cone device has been described in the U.S. Pat. No. 4,792,284 titled "Device for creating and exploiting pressure difference and the technical applications thereof". The double-cone device, as described in this patent, is illustrated in FIG. 1. [0004] Double-cone device 100 consists of two coaxial frustroconical sections, referred to as entry cone 102 and exit cone 104, held together by a cylindrical tube 110. Entry cone 102 is characterised by its length L.sub.1, larger diameter D.sub.1, smaller diameter d.sub.1, and conical angle .theta..sub.1. Similarly, exit cone 104 is characterised by its length L.sub.2, larger diameter D.sub.2, smaller diameter d.sub.2 and conical angle .theta..sub.2. The region of minimum diameter between the two sections is referred to as orifice 106. Double-cone device 100 is fed with a feed flow that enters entry cone 102 and discharges out through exit cone 104. The feed flow can be any fluid i.e. either liquid or gas. [0005] Cylindrical connecting tube 110 surrounds the area around the orifice. An inlet 108 on cylindrical connecting tube 110 allows suction of fluid from outside device 100 to be drawn into orifice 106. [0006] During the flow within double-cone device 100, the feed flow undergoes a pressure variation that is a function of the geometry of double-cone device 100 and the fluid velocity at the inlet of entry cone 102. This pressure variation within double-cone device 100 is illustrated in FIG. 2. As shown in FIG. 2, the pressure within double-cone device 100 gradually falls as the fluid flows through entry cone 102 and then again rises in exit cone 104. The pressure is minimum at point (Z=0) within orifice 106. Also, pressures P.sub.1 at the beginning (z=-L.sub.1) of the entry cone 102 and P.sub.2 at outlet point (z=L.sub.2) of exit cone 104 are different. This difference in pressure .DELTA.P=P.sub.1-P.sub.2 is referred to as the pressure-drop across device 100. [0007] Behaviour of the feed flow or the pressure variation within the device is a function of various factors including geometrical parameters such as the conical angles of the entry and exit cones, external pressures at the inlet of the entry cone and the outlet of the exit cone. Specifically, higher the external pressure lower the pressure at the orifice. This results in a higher suction force at the orifice. [0008] The performance of a double-cone device is usually measured in terms of its pressure amplification. Pressure amplification for a double-cone device is defined as the ratio of the pressure P.sub.2 at the outlet of the exit cone to the pressure-drop .DELTA.P across the device. Pressure amplification can be improved by reducing the pressure-drop or increasing the exit pressure. Another performance measuring parameter is the noise that is generated by a double-cone device. High noise level can lead to rapid wear and tear of the device and is generally considered to be environmentally unacceptable. Further, wear and tear of the device must be minimised so as to ensure that the device has a long lifecycle. [0009] Various modifications have been made in basic double-cone design to improve its performance. [0010] One such modification has been described in PCT patent application PCT/CH99/00403 titled "Double-cone for generation of a pressure difference". The patent describes a double-cone device comprising an entry and an exit cone connected by their small diameter ends to create an orifice. Further, the inlet is provided in the exit cone away from the orifice. The entry conical angle .theta..sub.1 has also been refined to be less than 5.degree.. These modifications decrease noise and wear and tear of the double-cone device. [0011] Another modification has been described in PCT patent application PCT/CH02/00134 titled "Double-cone device and pump". The double-cone device comprises an entry cone and an exit cone that are connected through a third cone. An inlet is provided in the exit cone. The smaller diameter ends of the entry cone and the third cone are connected to form an orifice. The conical angle of the third cone is less than that of the exit cone. Further, the conical angle of the third cone must be in the range 1.degree. to 5.degree.. The introduction of the third cone and the positioning of the inlet away from the orifice reduce wear and tear. This is because the wall material is not subjected to a very high stress, as is the case with the original double-cone structure. Pressure-drop across the device also reduces, leading to better suction performance. [0012] While various modifications have been made to the double-cone design, further improvements can be made to enhance the pressure amplification, reduce the noise levels and to stabilise the flow. For example, in the existing device under certain running conditions, the noise generation can reach the order of 110 to 115 decibels whilst the human noise tolerance level is around 85 decibel. Hence, there is a need for a double-cone device with lower noise levels. Further, in the existing double-cone devices, the flow within the device destabilises at high flow rates. Hence, there is a need to improve the design to stabilise the flow at high flow rates. SUMMARY [0013] An object of the present invention is to provide a double-cone device with enhanced pressure amplification. [0014] Another object of the present invention is to provide a double-cone device with enhanced suction pressure at the inlet. [0015] Another object of the present invention is to provide a double-cone device with reduced noise levels. [0016] Another object of the present invention is to reduce the wear and tear in a double-cone device thereby increasing its lifetime. [0017] Another object of the present invention is to improve the flow profile of the fluid flowing through a double-cone device. [0018] Another object of the present invention is to provide a double-cone device with reduced working temperature. [0019] Yet another object of the present invention is to provide a double-cone device, which can work efficiently at higher flow velocities, as compared to the existing double-cone devices. [0020] The above objectives are attained by using a double-cone device having a continuous geometry. Specifically, the double-cone device comprises two frustroconical sections referred to as the entry cone and the exit cone. The entry and exit cones have a common smaller diameter face. This common diameter region is referred to as the orifice. Further, there is a plurality of holes on the exit cone close to the orifice. [0021] The present invention achieves a higher pressure amplification, higher suction force and lower noise than that possible with the existing double-cone devices. This is achieved by using a continuous geometry and circular holes acting as the inlet for suction. [0022] Holes are made in the exit cone, downstream of the orifice, but within the section of the exit cone with a diameter less than 1.5 times diameter of the orifice. The size of the holes is less than or equal to half the diameter of the orifice. Continue reading about Double cone for generation of a pressure difference... Full patent description for Double cone for generation of a pressure difference Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Double cone for generation of a pressure difference patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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