CN1704608A

CN1704608A - Pump

Info

Publication number: CN1704608A
Application number: CN200510068507.1A
Authority: CN
Inventors: 富冈健太郎; 久野胜美; 高松伴直
Original assignee: Toshiba Corp
Current assignee: Toshiba Corp
Priority date: 2004-06-01
Filing date: 2005-04-28
Publication date: 2005-12-07
Also published as: US20050265833A1; JP2005344563A

Abstract

There is disclosed a pump comprising a pump housing, an impeller, and a motor. The pump housing comprises a pump chamber and at least one communication port opening into this pump chamber. The impeller comprises a plurality of vanes and is rotatably disposed in the pump chamber. The motor has a plurality of phases, and rotates the impeller. The number of communication ports, the number of vanes, and the number of phases of the motor are set in such a manner as to indicate prime numbers.

Description

Pump

Technical field

The present invention relates to be used to send the pump of fluid.

Background technique

The central processing unit (CPU) (CPU) that is used for electronic equipment has heat in the operation along with the increase of the raising of processing rate and function and the trend that increases.In recent years, as the counter-measure of this heat, a kind of electronic equipment has dropped into practical application, and this electronic equipment comprises a kind of so-called liquid-cooling system cooling unit, and it uses the much higher liquid refrigerant of specific heat of ratio of specific heat air to cool off CPU.

As described in No. the 3452059th, Japan Patent, once the someone proposed a kind of cooling unit, and this device has the pump of heat-exchange type.A kind of contact on the electronic component such as CPU that the heat-exchange type pump closely is attached to heating, the electronic component of heating and liquid refrigerant heat exchange, thereby the electronic component of cooling heating, and also liquid refrigerant is further circulated.

As the pump that is applied to cooling unit, the requirement of the sound of generation when having proposed extremely to reduce to drive.

Summary of the invention

In view of this situation, made the present invention, the purpose of this invention is to provide a kind of pump that can reduce the sound that produces when driving.

According to a kind of mode of the present invention, a kind of pump is provided, it comprises: a pump case, this pump case have a pump chamber and at least one feeds the connecting port of this pump chamber; A pump impeller, this pump impeller has a plurality of blades, is arranged on rotationally in the pump chamber; And a motor, this motor has a plurality of phases, and pump impeller is rotated, and it is characterized in that: the number mutually of the number of connecting port, the number of blade and motor is a prime number.

This pump according to a mode of the present invention can reduce the sound that produces when driving.

Description of drawings

The stereogram of Fig. 1 is represented a portable computer, and it has the pump according to first embodiment of the invention;

Fig. 2 is the partial cross-sectional side-elevation view of the portable computer of Fig. 1;

Fig. 3 is the flat sheet of the bottom view of the portable computer of Fig. 1;

Fig. 4 is the planimetric map of partly cut-away of the portable computer of Fig. 1, and cooling unit is contained in first housing in the shown position;

Fig. 5 is the exploded perspective view of pump;

Fig. 6 is the planimetric map of the pump of looking from the heating plate side;

Fig. 7 is the planimetric map of the pump of looking from the bottom side, and heating plate is omitted in the shown position;

Fig. 8 is the sectional view along VIII-VIII line intercepting among Fig. 7;

Number, pump impeller blade number and the number of motor phases that the curve of Fig. 9 is shown in the connecting port that feeds pump chamber has in the situation of non-1 common divisor, the relation between blade rotation frequency and the sound pressure level; And

Figure 10 is the planimetric map according to the pump of second embodiment of the invention of looking from the bottom side, is the state that heating plate is omitted among the figure.

Embodiment

Contrast Fig. 1 to 8 describes the first embodiment of the present invention below.In the present embodiment, pump of the present invention is according to a case description, and this exemplary application is on being arranged on as the cooling unit in the portable computer of electronic equipment.

Fig. 1 to 3 expression is as the portable computer 1 of electronic equipment.Portable computer 1 comprises a master unit 2 and a display unit 3.Master unit 2 comprises first housing 10 with a flat box shape.First housing 10 comprises a diapire 11a, a upper wall 11b, an antetheca 11c, left and right sidewall 11e, a 11d and a rear wall 11f.Upper wall 11b supports a keyboard 12.

As shown in Figure 2, for example, the diapire 11a of at least the first housing 10 makes with metallic material such as magnesium alloy.Diapire 11a has a protuberance 13 and a recess 14.Protuberance 13 is arranged in diapire 11a latter half of, and is outstanding downwards from the first half of diapire 11a.Recess 14 is near caving in towards first housing, 10 inboards before the protuberance 13.Recess 14 is arranged on the middle part along the width direction of first housing 10.

Shown in Fig. 2 and 3, be formed with a pair of first shank 15a in the bottom of protuberance 13,15b (in Fig. 2, only drawing).These shanks 15a, 15b are arranged on the width direction of first housing 10 and are separated from each other.Similarly, on the front end of diapire 11a, be formed with a pair of second shank 16a, 16b (only drawing among Fig. 2 one).These second shanks 16a, 16b are arranged on the width direction of first housing 10 and are separated from each other.

The first and

second shank

15a, 15b, 16a, 16b contact the upper surface of a top board B.Therefore, first housing 10 tilts with the downward attitude in front portion, forms a gap S between the upper surface of the bottom of protuberance 13 and top board B.

Shown in Fig. 2 and 3, the rear wall 11f of first housing 10 has a plurality of first floss holes 17.First floss hole 17 is in a row arranged on the width direction of first housing 10.As shown in Figure 3, protuberance 13 has a next door 18 that is interposed between protuberance and the recess 14.Form a plurality of second floss holes 19 in the next door 18.Second floss hole 19 is arranged to a row on the width direction of first housing 10, and uncovered in recess 14.

As shown in Figure 1, display unit 3 comprises one second housing 20 and a liquid crystal display panel 21.Liquid crystal display panel 21 is contained in second housing 20.Liquid crystal display panel 21 has the screen 21a that shows image.Screen 21a is exposed to second housing, 20 outsides by the opening 22 that forms on second housing 20.

Second housing 20 is bearing in the rearward end of first housing 10 by a hinge (not shown).Therefore, display unit 3 moves between a closed position and an open position, on closed position, display unit is placed on the master unit 2, from top overlay keyboard 12, on open position, display unit is with respect to master unit 2 liftings, so that expose keyboard 12 or screen 21a.

As Fig. 2, shown in 4 and 8, adorn a printed circuit board (PCB) 30 in first housing 10.Be installed in as the CPU31 of generating component on the upper surface of rearward end of printed circuit board (PCB) 30.As shown in Figure 8, CPU30 has the integrated circuit chip (IC sheet) 33 at middle part that a base plate 32 and are arranged on the upper surface of base plate 32.IC sheet 33 has very big heating value in the function operation with high processing rate and increase, need cooling in order to keep stable operation.

As shown in Figure 4, a liquid cooling system cooling unit 40 is installed on the portable computer 1, utilizes liquid refrigerant such as non freezing solution to cool off CPU31.Cooling unit 40 is contained in first housing 10.Cooling unit 40 comprises that a pump 41 as heated portion and heat exchanger, one are as the radiator 42 of radiator portion, a peripheral passage 43 etc.

Shown in Fig. 4 to 8, pump 41 circulates liquid refrigerant in peripheral passage 43, and comprises one also as the pump case 50 of heated portion, a pump impeller, motor 80 (see figure 8)s etc.

Pump case 50 has the flat box shape of size greater than CPU31, and its plane is square basically.As shown in Figure 5, for example, pump case 50 comprises a main casing 51 and the heating plate 53 as heated portion.For example, main casing 51 is formed by synthetic resin.It should be noted that main casing 51 can be formed by thermal conductivity good metal such as aluminum alloy.Main casing 51 has a recess 52 that opens wide downwards.Heating plate 53 is as the lid of main casing 51.Heating plate 53 is arranged on the main casing 51, covers the open end of recess 52.The lower surface of heating plate 53 constitutes a flat heating surface 54.Heating plate 53 is to be made as aluminium and aluminum alloy by the good metallic material of thermal conductivity, seals the open end of recess 52 in the close mode of liquid by O shape circle 55.

As Fig. 5, shown in 7 and 8, the inside of pump case 50 is divided into a pump chamber 57 and an apotheca 58 by a next door 56.As shown in Figure 4, the bight C1 of pump chamber 57 in four bight C1 to C4 of main casing 51 is provided with.Apotheca 58 storaging liquid refrigerant, and surround pump chamber 57.Next door 56 is upright from the upper wall 51a of main casing 51.Form at least one connecting port in the next door 56, described connecting port feeds pump chamber 57,, pump chamber 57 is communicated in apotheca 58 that is.The number of connecting port is configured to a prime number.In this pump case 50, comprise that two connecting ports of first connecting port 59 and second connecting port 60 are arranged in the next door 56.

Bight C3 with C1 diagonal angle, bight is provided with is cut in four bight C1 to C4 of main casing 51.This bight C3 is provided with the discharge pipe 61 as first connected part, and the inside of pump case 50 is connected in the outside of pump case 50, also is provided with the pumping tube 62 as second connected part, the inside of pump case 50 is connected in the outside of pump case 50.Discharge pipe 61 and pumping tube 62 are horizontally disposed with therebetween with interval.The downstream of the upstream extremity of discharge pipe 61 and pumping tube 62 is stretched to the outside by main casing 51.

First connecting tube 63 be arranged on the upstream extremity of discharge pipe 61 and be located between first connecting port 59 in the next door 56.Second connecting tube 64 be arranged on the downstream of pumping tube 62 and be located between second connecting port 60 in the next door 56.First connecting tube 63 and second connecting tube 64 form a unit, formation connecting tube unit 65.

That is to say that the upstream extremity of discharge pipe 61 is communicated with pump chamber 57 by first connecting tube 63 and first connecting port 59.The downstream of pumping tube 62 is communicated with pump chamber 57 by second connecting tube 64 and second connecting port 60.It should be noted that a gas/liquid sorting hole 66 can be arranged in first connecting tube 63 or second connecting tube 64.In this case, even when the orientation of pump case 50 changed with any direction, the position in hole 66 preferably was arranged to be in unchangeably under the liquid level that is stored in the liquid refrigerant in the apotheca 58.

In addition, the outer surface of the upper wall 51a of main casing 51 (upper surface of pump case 50) has the recess (see figure 8) 67 that sets son in, have in this recess hereinafter with the stator of talking about 82, and the recess (not shown) with dress control substrate in, control substrate (not shown) is housed in this recess.As shown in Figure 8, can be provided with a lid 50a in main casing 51, this lid covers guide card 82 and control substrate, and prevents the leakage and the evaporation of the liquid refrigerant in the pump case 50.

Dish type pump impeller 70 is contained in the pump chamber 57 of pump case 50.Pump impeller 70 stirs the liquid refrigerant in the pump chambers 57, liquid refrigerant is delivered to the outside (peripheral passage 43) of pump case 50 from pump case 50.For example, pump impeller 70 is formed by resin, has disc-shaped main body part 71, passes the rotating shaft 72 at center of main body 71 and at least one end face in a plurality of two end faces that are arranged on main body 71 as in the face of the blade 73 on the end face of heating plate 53.The number of the blade 73 of pump impeller 70 is set prime number for.This pump impeller 70 for example has 17 blades 73.Shown in Fig. 5 and 7, these blades 73 are with respect to center of rotation (rotating shaft 72) radial arrangement of pump impeller 70.Blade 73 arranges that with the interval that equates the angle θ 1 of every pair of adjacent blades 73 formation is constant (angle same).As shown in Figure 8, pump impeller 70 is by the upper wall 51a and heating plate 53 rotatably supports of main casing 51, and rotating shaft 72 is extended on the upper wall 51a of main casing 51 and heating plate 53.

As shown in Figure 8, the motor 80 that rotates pump impeller 70 is contained in the pump case 50, and motor 80 has a plurality of phases.For example, be provided with a induction machine, have a rotor 81 and a stator 82 as motor 80.Rotor in the form of a ring.Rotor 81 coaxially is fixed on the main body 71 of pump impeller 70, and is contained in the pump chamber 57.The rotor magnetic patch 81a of a plurality of cloudy plates and positive plate alternated magnetization is contained in the rotor 81.Rotor magnet 81a and rotor 81 and pump impeller 70 unitary rotation.Stator 82 has a plurality of magnetic poles as a plurality of phases.For example, this stator 82 has a plurality of coils 83 as a plurality of phases.The number of the phase of motor 80 (number (number of poles) that is equivalent in the present embodiment, coil 83) is configured to prime number.As shown in Figure 5, for example, stator 82 has 7 coils 83.

As shown in Figure 8, stator 82 is contained in the recess 67 of the installation stator under the outer surface of upper wall 51a of main casing 51.The recess 67 that stator is installed enters rotor 81.Therefore, stator 82 coaxially is contained in the rotor 81.The control substrate is contained in the recess of installation and control substrate, and is electrically connected on stator 82.

For example, the electric power of stator 82 being carried is that power connection with portable computer 1 carries out simultaneously.Carry by electric power, upwards produce rotating magnetic field in the week of stator 82, this magnetic field magnetic coupling is in the magnet of rotor 81.Therefore, between the rotor magnet 81a of stator 82 and rotor 81, produce circumferential torque, pump impeller 70 clockwise directions are rotated along rotor 81.

As mentioned above, the lower surface of heating plate 53 has flat heating surface 54.On the other hand, shown in Fig. 6 and 8, a protuberance 90 that is called as so-called side canal is arranged on facing on the position of pump chamber 57 of heating plate 53 upper surfaces.

An end face 91 of protuberance 90 has: with a part (circular arc) 92 of the concentric circle of the center of rotation O (the center of rotation O of pump impeller 70 is on the axis L (see figure 8) of the rotating shaft 72 of pump impeller 70) of pump impeller 70; From a pair of edge 93a that the opposite end of circular arc portion 92 is radially extended with respect to the center (facing the position of the center of rotation O of pump impeller 70) of

circular arc

92,93b; And make described edge 93a, the circular arc 94 that the end of 93b is connected with each other.It is fan-shaped that above-mentioned end face is substantially.Protuberance 90 is arranged on the upper surface of heating plate 53, makes the

connecting port

59,60 of circular arc 94 in the face of next door 56.It should be noted that protuberance 90 can or be individually formed with heating plate 53 integral body.

Protuberance 90 will enter pump chamber 57 from second connecting port 60, will be transported to the outside of pump chamber 57 by pump impeller 70 along the liquid refrigerant of circumferential flow from first connecting port 59 satisfactorily pump chamber 57.That is to say, owing to be provided with protuberance 90, thereby the recline side surface of protuberance 90 of the liquid refrigerant that in pump chamber 57, is stirred, on protuberance 90, float, its loop direction is changed over towards first connecting port 59.Therefore, the liquid refrigerant that is stirred in pump chamber 57 can be sent to the outside of pump chamber 57 satisfactorily from first connecting port 59.

As shown in Figure 7, suppose that the angle that every pair of adjacent blades 73 forms is θ 1, a pair of edge 93a of the end face 91 of protuberance 90 in pump 41, the angle that 93b forms is θ 2, then these angles θ 1 and θ 2 are configured to make the value of θ 2/ θ 1 not to be integer.θ 1 can be an irrational number by merchant's (value of θ 2/ θ 1) that θ 2 removes gained.

In addition, the noise that is produced when driving said pump 41 is divided into periodic noise and aperiodicity noise.For example, following periodic noise is arranged:

(1) along with the rotation of pump impeller 70 in liquid refrigerant, produce produce when pressure floats, by the number of the blade 73 of pump impeller 70 and the revolution determined noise of pump impeller 70;

(2) connecting port that opens wide in the blade 73 process pump chambers 57 of pump impeller 70 is 59,60 o'clock, the noise that the pressure that produces in liquid refrigerant floats and produced;

(3) the long-pending noise that number produced that is determined of the revolution of the number of phases of motor 80 and pump impeller 70, wherein the number that the number of phases determined of motor 80 is plural numbers that amass of the number of phases (numbers of poles of motor 80 rotor magnet 81a) of the number of phases (number of coil in the motor 80) of stator 82 and rotor 81; And

(4) when the blade 73 of pump impeller 70 passes through protuberances 90, the noise that the pressure that produces in liquid refrigerant floats and produced.

As shown in Figure 9, the periodic noise in above-mentioned (1) periodically is produced as primary wave (n=1), secondary wave (n=2), tertiary wave (n=3) according to following formula (5) ...

(rotational frequency of the number * pump impeller 70 of the blade 73 of pump impeller 70)

* n (n is a natural number) ... (5)

Therefore, cover in the situation of the peak value of the sound pressure level of formation in the following formula (5) a value, the periodic noise that pump 41 produces increases.For example, said circumstances is exactly the situation of the peak value of the peak value of above-mentioned (5) sound pressure level of the producing sound pressure level that covers another periodic noise:

The number of the blade of (2 ') pump impeller 70 and the connecting

port

59,60 that opens wide in pump chamber 57 have common divisor;

The number of the blade 73 of (3 ') pump impeller 70 and the number of phases of motor 80 (number of the coil 83 of the stator 82 in the motor 80) have common divisor; And

(4 ') θ 2/ θ 1 is an integer, supposes that the angle that every pair of adjacent blades 73 forms is θ 1, and the angle that a pair of edge of the end face 91 of protuberance 90 forms is θ 2.

Therefore, in pump 41, the number of the number of connecting

port

59,60, blade 73 and all be prime number as the number of the coil 83 of the stator 82 of the number of phases of motor 80.As shown in Figure 5, for example, in pump 41, the number of intercommunicating

pore

59,60 is set to 2, and the number of blade 73 is set to 17, and the number of coil 83 is set to 7.

It should be noted, as the combination of connecting port number, lobe numbers and number of motor phases, preferably the connecting port number is set at 2, lobe numbers is set at 23 and motor is set at 3 utmost points.

In this case, when pump impeller 70 rotates, the pressure of liquid refrigerant float the noise produced sound pressure level peak value, when the connecting port 59 of blade 73 through in pump chamber, opening wide of

pump impeller

70,60 o'clock, the peak value of the sound pressure level of the long-pending noise that is produced of the revolution of the peak value of the sound pressure level of the unsteady noise that produces of the pressure in liquid refrigerant and the number that the number of phases determined of motor 80 and pump impeller 70 was difficult for overlapping.Therefore, the noise that produces in the time of can reducing driven pump 41.

In addition, as shown in Figure 7, suppose that the angle that every pair of adjacent blades 73 forms is θ 1, the angle that a pair of edge of protuberance 90 end faces 91 forms is θ 2, and the value of θ 2/ θ 1 is not an integer.In the present invention, the value of θ 2/ θ 1 is set at irrational number.

Therefore, the blade 73 of first connecting port 59 and pump impeller 70 each other timing and second connecting port 60 and the pump impeller 70 of process blade 73 each other the timing of process can be staggered.Therefore, the noise that produces in the time of can reducing driven pump 41.

In the pump 41 that is configured in this manner, for example, CPU31 is placed on the printed circuit board (PCB) 30, covers CPU31 from the top, and the center of pump case 50 is complementary with the center of CPU31 (center identical with the center of IC sheet).It should be noted that the coupling at the center of pump case 50 and the center of CPU31 means that the vertical line that passes the center of pump case 50 passes the center of CPU31.

As shown in Figure 8, the pump case 50 of pump 41 is fixed on the diapire 11a of first housing 10 with printed circuit board (PCB) 30.As shown in Figure 4, two adjacent corners such as the bight C1 of pump case 50 in four bight C1 to C4, C2 and all the other two bight C3, there are three mounting points 68a, 68b, 68c in the middle part of C4.The diapire 11a of first housing 10 is corresponding to three mounting portion 68a, and 68b has three projection sections 34 on the position of 68c.

Projection section 34 projects upwards from diapire 11a.Printed circuit board (PCB) 30 overlays on the end surface of projection section 34.

Except above-mentioned mounting portion 68a, 68b, 68c, one is used for that pump 41 is installed in mounting mechanism on first housing 10 and comprises three cylindrical shape mold inserts 100, three helical springs 101, three 102, three screws 103 of C shape circle etc.Each mold insert 100 has a projection 100a, along circumferentially outwards giving prominence to substantially horizontal in the upper end.

Pump 41 is fixed with respect to CPU31 with the direction that compresses in the following manner.It should be noted that Fig. 8 is illustrated in a mounting structure among the 68a of mounting portion, pump also is installed in mounting portion 68b with similar structure, on the 68c.

At first mold insert 100 is passed helical spring 101.Mold insert 100 is inserted mounting portion 68a.The C shape circle 102 that prevents to come off is assemblied in the mold insert 100.Therefore, on the direction that projection 100a pulls down from heating plate 53, mold insert 100 is in the state that is pushed by helical spring 101.

The transfer greases (not shown) is applied to the upper surface of IC sheet 33 or facing on the zone of IC sheet 33 of heating surface 54, and the heating surface 54 of pump case 50 is arranged in the face of IC sheet 33.Screw 103 is passed mold insert 100, and be screwed in the projection section 34 on the printed circuit board (PCB) 30.Therefore, mold insert 100 is fixed on the projection section 34, and pump 41 is pressed to IC sheet 33 by the elasticity of helical spring 101.Therefore, IC sheet 33 is by the heating surface 54 of transfer greases hot connecting in pump case 50.

As shown in Figure 2, the radiator 42 of cooling unit 40 is contained in the projection 13 of first housing 10.Radiator 42 comprises a fan 131 and a radiating component 132.Fan 131 has a flat shell 133, and a centrifugal impeller 134 that is contained in the housing 133.

Impeller 134 has a center of rotation 134a and a plurality of from the radially-protruding blade 134b of center of rotation.Impeller 134 is supported by housing 133 by a flat electric machine (not shown).In this motor, impeller 134 is counterclockwise to rotate shown in the arrow among Fig. 4.

The radiating component 132 of radiator 42 comprises coolant channel 112 and a plurality of radiating fin 113 that a liquid refrigerant flows through.Coolant channel 112 for example comprises a flat copper tube, and has long and short axis.Coolant channel 112 coaxially centers on impeller 134 in the form of a ring.This coolant channel 112 overlays on the bottom of projection 13, makes the thickness direction of minor axis along first housing 10.Therefore, coolant channel 112 hot connectings are in first housing 10.Coolant channel 112 has a upstream extremity 114 and a downstream 115.Upstream extremity 114 constitutes the refrigerant import 114a that liquid refrigerant flows into, and downstream 115 constitutes the refrigerant outlet 115a that liquid refrigerant flows out.Coolant channel 112, upstream extremity 114 and downstream 115 constitute the part (circulation canal 43 will be described below) of circulation canal 43.

Each radiating fin 113 is to be formed as aluminum alloy by the good metallic material of thermal conductivity, the side's of having plate shape.Radiating fin 113 is circumferentially spaced apart along impeller 134, and with respect to impeller 134 radial arrangement.

Radiating fin 113 is upright along the thickness direction of first housing 10.The lower end of radiating fin 113 for example is fixed on the upper surface of flat refrigerant agent passage 112 by welding.Therefore, determined the distribution interval of radiating fin 113, made radiating fin 113 hot connectings in coolant channel 112.The upper end of radiating fin 113 is against the internal surface of the upper wall of housing 133, and hot connecting is in housing 133.

The circulation canal 43 of cooling unit 40 has first pipeline 121 and second pipeline 122.First pipeline 121 is connected in the discharge pipe 61 of pump case 50 the refrigerant inlet 114a of coolant channel 112.Second pipeline 122 is connected in the pumping tube 62 of pump case 50 the refrigerant outlet 115a of coolant channel 112.

In other words, the coolant channel 112 of radiating component 132 is as the 3rd pipeline that first pipeline 121 is connected in second pipeline.Therefore, liquid refrigerant circulates by first pipeline 121, second pipeline 122 and coolant channel 112 between pump unit 25 and radiator 42.

The operation of cooling unit 40 will be described below.

The IC sheet 33 of CPU31 produces heat during using portable computer 1.The heat that is taken place by IC sheet 33 reaches pump case 50 by heating surface 54.Because the apotheca 58 of pump chamber 57 and pump case 50 is filled with liquid refrigerant, thereby liquid refrigerant can absorb many heat that reach pump case 50.

Carrying to the electric power of motor 80 stators 82 is that connection with the power supply of portable computer 1 is carried out simultaneously.Therefore, produce torque between the rotor magnet 81a of stator 82 and rotor 81, rotor 81 rotates with pump impeller 70.When pump impeller 70 rotated, the liquid refrigerant in pump chamber 57 is pressurized to be reached from discharge pipe 61 dischargings, and causes radiator 42 by first pipeline 121.

In pump 41, it is prime number that the number of the number of connecting port 59,60, blade 73 and the number of phases of motor 80 (number of the coil 83 of stator 82) are set Chengdu.Therefore, when the blade 73 of pump impeller 70 through 59,60 o'clock pressure in liquid refrigerant of the connecting port that in pump chamber 57, opens wide float the noise that produces sound pressure level peak value, by the peak value of the sound pressure level of the long-pending noise that is produced of the revolution of the number of the number of phases decision of motor 80 and pump impeller 70 and when pump impeller 70 rotates the float peak value of the sound pressure level that produces of the pressure in the liquid refrigerant be difficult for overlapping.In pump 41, suppose that the angle that every pair of adjacent blades 73 forms is θ 1, the angle that a pair of edge of the end face 91 of protuberance 90 forms is θ 2, it is not integer that these angles θ 1 and θ 2 are configured to make θ 2/ θ 1.Therefore, the blade 73 of first connecting port 59 and pump impeller 70 each other timing and second connecting port 60 and the pump impeller 70 of process blade 73 each other the timing of process staggered.Therefore, the noise ratio that produces when pump 41 drives reduced in the past.

Be admitted to coolant channel 112 by the heat exchange heated liquid refrigerant in pump case 50 from refrigerant inlet 114a.Liquid refrigerant flows to refrigerant outlet 115a in coolant channel 112.In flow process, the heat of the IC sheet 33 that is absorbed by liquid refrigerant is reached coolant channel 112, and further reaches radiating fin 113 from coolant channel 112.

According to present embodiment, because coolant channel 112 hot connectings are in the projection 13 of first housing 10, the heat that reaches coolant channel 112 from liquid refrigerant can spread in first housing 10.In addition, because radiating fin 113 hot connectings are in the upper wall of housing 133, thereby can be released into housing 133 from the heat that liquid refrigerant reaches radiating fin 113.

When the impeller 134 of radiator 42 rotates in the using process of portable computer 1, thereby air is from the outer peripheral portion radial discharge of impeller 134.Air passes adjacent radiating fin 113 as cooling air.Therefore, coolant channel 112 and radiating fin 113 are cooled, and the most of heat that reaches both air stream that is cooled is taken away.In addition, this cooling air is disposed to the rear portion of first housing 10 via first and second floss holes 17,19 of first housing 10 together with heat.At this moment, second floss hole 19 opens wide in the recess 14 of diapire 11a.In addition, when the top board B that is placed on desk when portable computer 1 went up, a gap S who is connected in recess 14 formed between diapire 11a and top board B.Therefore, be disposed to the outside of first housing 10 via gap S from the cooling air of second floss hole 19 discharging from recess 14, cooling air flow is not limited by top board B.

The pumping tube 62 of pump cases 50 is introduced in contrast, the liquid refrigerant that cools off by heat exchange in radiator 42 via second pipeline 122 from refrigerant outlet 115a.This liquid refrigerant drains into pump case 50 inside from the downstream of pumping tube 62 by second connecting port 60.

The liquid refrigerant that returns pump case 50 is pumped into pump chamber 57 from connecting port 60.The liquid refrigerant that sucks pump chamber 57 is pressurizeed once more, and sends into radiator 42 from discharge pipe 61.

When this circulation was repeated, the heat of IC sheet 33 was transferred to the radiating component 132 of radiator 42 continuously, and the cooling air that passes between the radiating fin 113 of radiating component 132 upwards flows, and was disposed to the outside of portable computer 1.

As mentioned above, according to the pump 41 of present embodiment, it is prime number that the number of the blade 73 of the number of connecting

port

59,60, pump impeller 70 and the number of phases of motor 80 are set Chengdu.Therefore, the blade 73 of pump impeller 70 through 59,60 o'clock pressure in liquid refrigerant of the connecting port that in pump chamber 57, opens wide float the number of number of phases decision of peak value, motor 80 of sound pressure level of the noise that produces and pump impeller 70 revolution long-pending generation noise sound pressure level peak value and when pump impeller 70 rotates the float peak value of the sound pressure level that produces of the pressure in the liquid refrigerant be difficult for overlapping.Therefore, the noise that produces when pump 41 drives can be reduced.

In addition, according to the pump 41 of present embodiment, suppose that the angle that adjacent blades forms is θ 1, a pair of edge 93a of the end face 91 of protuberance 90, the angle that 93b forms is θ 2, and it is not integer (being set at irrational number in the present embodiment) that these angles θ 1 and θ 2 are configured to make θ 2/ θ 1.Therefore, the blade 73 of first connecting port 59 and pump impeller 70 each other timing and second connecting port 60 and the pump impeller 70 of process blade 73 each other the timing of process staggered.The noise that produces when therefore, pump 41 drives can be reduced.

In addition, in the pump 41 of present embodiment, pump case 50 has hot connecting in the CPU31 as heating piece.Therefore, pump 41 not only is used as the heat exchanger of sending fluid such as liquid refrigerant, and is used as the heated portion of the heat of accepting generating component such as CPU31.The noise that produces when in addition, pump 41 drives is little.Therefore, this pump is recommended to be used in the liquid cooling system cooling unit 40 that is installed on electronic equipment such as the portable computer 1.

Contrast Figure 10 describes the second embodiment of the present invention below.

In the pump 41 of present embodiment, the number of the blade 73 of pump impeller 70 is configured to prime number, for example, and 17.Blade 73 unequal interval ground arrange, make different other described angles, at least one angle in the angle that every pair of adjacent blades 73 forms.Blade 73 is arranged with the interval of not waiting, and makes adjacent vanes 73 constitute different angles.At this moment, by a pair of edge 93a of the end face 91 of protuberance 90, the angle θ 2 that 93b forms is not integer by the angle that is formed by every pair of adjacent blades 73 except that resulting value.

It should be noted that when blade 73 was arranged with unequal interval (inconstant interval), the number of blade 73 needn't be prime number.Other structure identical with first embodiment uses identical reference character, repeats no more.

According to the pump 41 of present embodiment, blade 73 arranges with unequal interval (non-constant interval), makes in the angle that every pair of adjacent blades 73 forms at least one be different from other described angle.In this case, when pump impeller 70 rotated, each blade 73 can stagger to the liquid refrigerant timing that changes of exerting pressure.The blade 73 of first connecting port 59 and pump impeller 70 each other timing and second connecting port 60 and the pump impeller 70 of process blade 73 each other the timing of process can be staggered.Therefore, the noise that produces when pump 41 drives can be reduced.

It should be noted that pump of the present invention not only can be widely used in electronic equipment such as the portable computer, also can be widely used in the cooling unit of installing on the electronic equipment and other equipment.

Claims

1. pump, it comprises:

A pump case (50), this pump case have a pump chamber (57) and at least one feeds the connecting port (59,60) of this pump chamber (57);

A pump impeller (70), this pump impeller have a plurality of blades (73), are arranged on rotationally in the pump chamber (57); And

A motor (80), this motor has a plurality of phases, and pump impeller (70) is rotated,

It is characterized in that: the number of the number of connecting port (59,60), blade (73) is a prime number with the number mutually of motor (80).

2. pump as claimed in claim 1 is characterized in that described pump impeller (70) comprises a ring-shaped rotor magnets (81a);

Stator (82) with a plurality of phases is arranged in the rotor magnet (81a), and

The number of the number of connecting port (59,60), blade (73) is a prime number with the number mutually of stator (82).

3. pump as claimed in claim 1 or 2 is characterized in that the center of rotation radial arrangement of described a plurality of blade (73) with respect to pump impeller (70), and

Described a plurality of blade (73) arranges that uniformly-spaced the angle (θ 1) that every pair of adjacent blades (73) is formed is constant.

4. pump as claimed in claim 3 is characterized in that: described pump case (50) has the surface of a pair of qualification pump chamber (57),

On at least one surface on described a pair of surface, be provided with a protuberance (90), this protuberance comprise a pair of edge that radially extends from the center of rotation of pump impeller (70) (93a, 93b), and

Suppose that the angle that is formed by every pair of adjacent blades (73) is θ 1, by the described a pair of edge of the end face of protuberance (90) (93a, 93b) angle of Xing Chenging is θ 2, it is not integer that described angle θ 1 and θ 2 are configured to make the value of θ 2/ θ 1.

5. pump as claimed in claim 4, it is characterized in that: the angle that supposition is formed by every pair of adjacent blades (73) is θ 1, by the described a pair of edge of the end face of protuberance (90) (93a, 93b) angle of Xing Chenging is θ 2, the value that described angle θ 1 and θ 2 are set to θ 2/ θ 1 is an irrational number.

6. pump as claimed in claim 1 or 2 is characterized in that, described a plurality of blades (73) are with respect to the center of rotation radial arrangement of pump impeller (70), and

Described a plurality of blade (73) unequal interval ground is provided with, and makes in the angle that every pair of adjacent blades (73) forms at least one be different from other described angle.

7. pump as claimed in claim 1 is characterized in that: described a plurality of blades (73) are with respect to the center of rotation radial arrangement of pump impeller (70), and the angle that every pair of adjacent blades (73) is formed provides non-constant interval.

8. as the described pump of claim 1,2 or 7, it is characterized in that: described pump case (50) has the heating surface (54) of hot connecting in a generating component (31).