瑞典专利SE1100424A1 TFläkt

专利PDF首页>>瑞典专利

专利附录

专利说明

权利要求

类似技术

同族专利

引用文献

法律状态

优先权

专利摘要:
Device for entraining the fluid in the impeller of a centrifugal pump in such a way that the sound generated by the centrifugal pump is reduced. This is achieved according to the present invention in that the means for carrying the fluid in the impeller are designed in such a way that locally high speeds are reduced and that the fluid leaving the periphery of the impeller has an even velocity in the circumferential and height direction of the impeller. This even outflow is obtained by entraining the fluid with a plurality of elongate elements distributed around the axis of rotation and with the impeller rotating.
公开号:SE1100424A1
申请号:SE1100424
申请日:2011-05-27
公开日:2012-11-28
发明作者:Torgny Lagerstedt；Peter Franzen
申请人:Torgny Lagerstedt Ab；
IPC主号:

专利说明:

15 20 25 30 come out with the flowing air but can also generate vibrations in ﬂ genuine and flow channels which in turn generate sound.
In a pump, pressure pulsations can cause vibrations in the pump and pipelines, which in turn produce a sound that is propagated further through the air. Pressure pulsations can also cause problems in the case where it is desired to have pulsation-free flow.
In the following description, “ﬂ genuine” is used to denote a centrifugal pump or centrifugal ﬂ genus that pumps a ﬂ uidum. In the text, “air” is also used in the following as a designation for ﬂ uidet, which, however, can previously be both a gas or a liquid.
From what has been written above, it appears that there is a general desire to reduce the sound level from ﬂ genuine. The sound radiation can e.g. is reduced by sweeping the wings backwards in the direction of rotation of the och spindle and then designing the stationary receiving part in the ﬂ spruce to receive the flow from the backward swept wings in a manner that provides a reduced sound level but often this is not sufficient.
Fans for air are used in ventilation systems and where it is essential to keep noise levels down. A very common ﬂ pair is the ﬂ pair that is driven by and sits on an AC electric motor. The fan is located here directly on the rear shaft of the rotor of the electric motor and is thus driven by the electric motor. The function of the fan is to drive an air flow that will cool the electric motor. The fan is usually designed with pump elements in the form of wings that extend purely radially. A cooling coil directly mounted on the electric motor makes a significant contribution to the electric motor's sound radiation. AC-powered electric motors are manufactured in large volumes by a number of manufacturers and are a cost-pressed mass product. Hundreds of millions of engines are manufactured annually. Electric motors are usually not manufactured with a specific direction of rotation, but it is the end customer who chooses the direction of rotation. This means that noise-reducing measures such as backward-swept wings do not work. A backward swept wing that rotates in a direction of rotation opposite the backward sweep provides an elevated sound level.
There is a general need for pumps and fences that have a low noise level. Low noise level is essential for ﬂ owners working in ventilation systems. It can also be noted that the cooling ﬂ on an electric motor has a requirement to be cheap and to be able to rotate in both directions of rotation without giving a high noise level. The present invention relates to a pump or ﬂ genuine with a ﬂ genuine or impeller which provides a reduced noise level. To understand the advantage of the invention, a brief description of a centrifugal genuine mode of operation is given below. The text uses the word ﬂ genuine and air / gas, but the description also applies to pumps that pump a liquid with a centrifugal effect.
In a centrifugal fan, the air entering the center part of the fan is set in rotation by a rotating ﬂ sprocket. The air flows radially outwards in the ﬂ sprocket at the same time as the ﬂ sprockets' driving element sets the air in rotation. The rotation of the air builds up a pressure that is used to pump (push) out the air through the stationary parts of the ﬂ shaft and drive the air further in the subsequent pipe system. The outlet housing is often designed to recover as much of the dynamic pressure of the air flow as possible. By dynamic pressure recovery is meant that the flow velocity leaving the ﬂ impeller is reduced during a pressure increase in a so-called diffuser part.
In the present invention, pressure pulsations and thus ﬂ genuine and pump noise are reduced by spreading air flow evenly in the circumferential and height direction of the ﬂ wheel.
This even flow generates no pressure pulsations and thus no sound radiation.
It is previously known that entrainment can take place with an impeller which is built up of a disc element rotating with the shaft, so-called Tesla pump. The device is also known as a Tesla turbine, U.S. Patent 1,061,206 (1913). However, such discs have a limited ability to carry a ﬂ uidum. Furthermore, a Tesla pump is complicated in its construction. Summary of the Invention A primary object of the present invention is an improved device for entraining the impedance of the impeller of a centrifugal pump in such a way as to reduce the noise generated by the centrifugal pump. This is achieved according to the present invention in that the means for carrying the impeller in the impeller are designed in such a way that locally high speeds are reduced and that the impeller leaving the periphery of the impeller has an even velocity in the circumferential and vertical direction of the impeller. This even outflow is obtained by bringing the med uidet with a plurality of elongate elements distributed around the axis of rotation and with the impeller rotating. Between the elements, flow paths are formed which extend axially radially and in the circumferential direction of the sprocket. In a preferred form, the elements are elongate and straight and are directed in a substantially axial direction.
The invention also relates to a device for cooling an electric motor according to the features stated in claim 2. Where an impeller designed according to claim 1 is used to drive the air for cooling an electric motor and that the impeller is driven by said electric motor.
The invention also relates to a device according to the features stated in claim 3. Where the drive elements in the impeller in claim 1 are essentially axially directed.
The invention also relates to a device according to the features stated in claim 4. Where the drive elements in the impeller in claim 1 are substantially radially directed.
The invention also relates to a device according to the features stated in claim 5. Where a device according to claim 1 pumps a liquid.
The invention also relates to a device according to the features stated in claim 6. Where a device according to claim 1 pumps a gas. The invention also relates to a device according to the features stated in claim 7 Where a device according to claim 1 pumps air.
Brief description of the figures Figure 1 shows a centrifugal pump with a radial outlet.
Figure 2 shows a centrifugal pump with an axial outlet.
Figure 3 shows the impeller of a centrifugal pump with entraining means according to the invention.
Figure 4 shows an electric motor with a centrifugal shaft for cooling the electric motor. The fan has an impeller with entraining means according to the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Figure 1 schematically shows a side view and a top view of centrifugal pump 1 with a impeller 2 comprising entraining means 3. The impeller 2 rotates in an outlet housing 4 and is driven by a drive means 10. Examples of drive means are electrically driven motors, hydraulic motors, gas or air-powered engines. Other types of drive means may also be possible. The outlet housing 4 is provided with a centrally located inlet pipe 5 and a tangentially directed outlet pipe 6. Figure 1 shows the outlet housing 4 as an outlet housing with a diffuser part 7. The diffuser 7 has an increasing area in the flow direction for recovering the dynamic pressure. The surfaces of the pump with a flow direction according to flow arrow 8 enter through the inlet pipe 5 which connects to the central part 11 of the impeller 2. flow arrow 9. For an outlet housing with a diffuser 7, the impeller has a direction of rotation according to rotation arrow 12. Other types of outlet housings may also be possible. Figure 2 shows a variant.
Figure 2 shows a side view of a centrifugal pump 20 with a impeller 2 comprising drive means 3. The impeller 2 rotates in an outlet housing 24 and is driven by a drive means 10. Examples of drive means are electrically driven motors, hydraulic motors, gas or air driven motors. Other types of drive means may also be possible. The centrifugal pump here has the outlet housing 24 symmetrically located relative to the impeller 2. The centrifugal pump 20 has an inlet pipe 25 which connects to the central part 11 of the impeller. The fluid leaves the pump via an outlet pipe 22. 2, the impeller 2 can have any direction of rotation. Possible recovery of dynamic pressure can take place by the outlet pipe being formed as a diffuser with a flow area increasing in the flow direction, which is schematically shown in Figure 2. Outlet pipes without a diffuser effect may also be possible.
Figure 3 shows a side and a top view of an embodiment of an impeller 30 according to the invention.
The impeller 30 is provided with axially extending driver elements 32. By axial is meant a direction parallel to a axis of rotation 3 1. The driver elements 32 are fixed to a base plate 33. The driver elements 32 are shown in Figure 3 as cylindrical elements extending purely axially. However, the carrier elements do not have to be cylindrical for good carrying. For example. the carrier elements can be triangular, square or polygonal, oval elements are also possible. The carrier elements 32 can also vary in height. For example. the carrier elements may be conical and have a diameter which decreases with the distance from the base plate 33. The elements need not have the same shape over the entire surface of the base plate. Nor do the elements need to be evenly distributed over the base plate.
The carrier elements can also extend substantially in the radial direction. This is not shown with ﬁ gur. Figure 4 shows a cooling shaft according to claim 2 for an electric motor 41. The electric motor 41 drives the cooling wheel impeller 42 via a shaft 43. The impeller rotates in a pump housing 44 which has an inlet part 45 and an outlet part 46 for the cooling air which is to cool the electric motor 41. Electric motor main task is to supply device 49 with rotational energy. However, electric motors have an efficiency that is not 100%. Usually the efficiency is about 80%. This means that the electric motor gets used during operation and that this heat must be cooled off. The cooling takes place with the cooling shaft 40 which blows cooling air on the electric motor cooling coils 47. Air which is to cool the electric motor 41 enters the cooling shaft impeller 42 at the inlet 45 with a flow direction according to flow arrow 48 and is carried by carrying element 50. according to flow arrow 51 towards and along the electric motor's cooling 47.

权利要求:
Claims (7)
[1]
1.) Centrifugal pump (1, 20) intended to pump a eller uid of gas or liquid comprising a impeller (2) a drive means (10) for driving the centrifugal pump impeller (2) completely or partially enclosed by an outlet housing (4, 24) with an inlet duct (5, 25) and an outlet duct (6, 22). The impeller (2) which rotates about an axis of rotation (31) is connected to means (3, 32) which have the function of carrying under during the rotation of the impeller, characterized in that said means (3, 32) comprises a number distributed around the axis of rotation and with the impeller (2) rotating elongate elements (3, 32) which between them form flow spaces which extend radially, axially and in the circumferential direction of the rotor.
[2]
2.) Centrifugal shaft (40) driven by an electric motor (41) intended to pump air for cooling said electric motor (41), an air stream (48) being diverted into an outlet portion (46) to flow towards and along the cooling surfaces of the electric motor (47) wherein the centrifugal spout (40) comprises a impeller (42) which is completely or partially enclosed by an outlet housing (44) with an inlet channel (45) and an outlet channel (46). The impeller (42) which rotates about an axis of rotation (31) is connected to means (3, 32, 50) which have the function of carrying the air which cools the electric motor (41) during the rotation of the impeller, characterized in that said means (3, 32, 50) comprises a number of mnt rotary shafts distributed and with the impeller (42) rotating elongate elements (32, 50) which between them form flow spaces which extend radially, axially and in the circumferential direction of the rotor.
[3]
Centrifugal pump according to Claim 1 or 2, characterized in that the elongate elements (32, 50) are substantially axially directed.
[4]
Centrifugal pump according to Claim 1 or 2, characterized in that the elongate elements (32, 50) are substantially radially directed. 10
[5]
5. A centrifugal pump according to claim 1, characterized in that the fluid to be pumped consists of a liquid.
[6]
Centrifugal pump according to Claim 1, characterized in that the pump being pumped consists of a gas.
[7]
7. A centrifugal pump according to claim 1, characterized in that the fluid pumped consists of air.

类似技术:

公开号 | 公开日 | 专利标题

CA2777144C|2017-11-21|A system for the construction of an axial fan

JP4656831B2|2011-03-23|Engine cooling fan with improved airflow characteristics

US9322307B2|2016-04-26|Device comprising a centrifugal separator and a drive arrangement including an impulse turbine

RU2502179C2|2013-12-20|Electric machine with double axial fan

US8007241B2|2011-08-30|Bi-directional cooling fan

JP2012154283A5|2013-03-28|

JP2017516939A|2017-06-22|Dry gas extraction from wet gas compressors.

CN104838149B|2017-04-19|Centrifugal compressor

SE467466B|1992-07-20|DEVICE FOR FLUIDIZATION, GAS SEPARATION AND PUMPING OF A SUSPENSION OF FIBER-containing CELLULO MATERIAL, AND ITS APPLICATION

CN104148720A|2014-11-19|Portable Planing Machine

KR100972202B1|2010-07-23|Seawater pump

EA012818B1|2009-12-30|Rotor for rotary machine and a rotary machine

CN101682233B|2012-10-03|Air cleaners for electrical machines

KR101918874B1|2018-11-14|Cooling structure for turbine, and gas turbine

KR20110043519A|2011-04-27|Sludge reactor pump for simultaneously conveying solids, liquids, vapors and gases

SE1100424A1|2012-11-28|TFläkt

SE531903C2|2009-09-08|Stirrer composition and method of flow control in a stirrer composition

SE444211B|1986-03-24|AIR PUMP FOR GAS PUMPING CONTAINING NOTATING PARTICLES

CN103816721A|2014-05-28|Vehicle axial flow type dust suction device

RU2518769C1|2014-06-10|Turbopump for two fluids

JP6378637B2|2018-08-22|Compression device

Beck et al.2016|How to design a centrifugal pump with constant power consumption for all flow rates

KR20200064209A|2020-06-08|Method and device for improvement lines of air flowing at the axial flow fan

CN102196961A|2011-09-21|High efficiency turbine

CN106660057A|2017-05-10|Centrifugal abatement separator

同族专利:

公开号 | 公开日

SE540461C2|2018-09-18|

引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

法律状态:
2021-12-28| NUG| Patent has lapsed|

优先权:

申请号 | 申请日 | 专利标题

SE1100424A|SE540461C2|2011-05-27|2011-05-27|Ways and devices to reduce fan noise from the cooling fan to an electric motor|SE1100424A| SE540461C2|2011-05-27|2011-05-27|Ways and devices to reduce fan noise from the cooling fan to an electric motor|

[返回顶部]