CN1186645A

CN1186645A - Pump device

Info

Publication number: CN1186645A
Application number: CN97125980A
Authority: CN
Inventors: 铃木肇; 松野智彦; 林直树
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1996-10-31
Filing date: 1997-10-30
Publication date: 1998-07-08
Anticipated expiration: 2017-10-30
Also published as: CN1104870C; JPH10127556A; JP3286540B2; KR19980033337A; KR100232275B1

Abstract

A pump unit includes an outer cover, a first and a second impellers; the outer cover is separated to form a first flow patch chamber and a second flow path chamber; the first impeller can be rotationally arranged in the first flow path chamber; the second impeller is connected with the first impeller coaxially and rotationally arranged in the second flow path chamber. The first flow path chamber and the first impeller form a first pump, while the second flow path chamber and the second impeller form a second pump; a driver for driving the first and the second impellers is arranged in the outer cover, and switching the rotation direction of the two impellers can switch the operation of the two impellers. A suction and a discharge port are formed around the second flow path chamber; the second flow path chamber narrows near the discharge port along the direction in which the water flows from the suction to the discharge port.

Description

Pump installation

The present invention relates to pump installation, this pump installation is assembled into an assembly with a plurality of pumps, and by the above-mentioned a plurality of pumps of driver drives.The present invention be more particularly directed to tableware is cleaned, rinses the pump installation that the dish cleaning machine of operations such as washing is used.

In the past, dish cleaning machine adopts the pump installation that cleans simultaneously with draining, this pump installation is assembled into an assembly with scavenging pump and these two pumps of draining pump, and above-mentioned scavenging pump constitutes by cleaning, rinse the spirality pump of washing, and above-mentioned draining pump is made of the turbulence type pump that carries out draining.In the said pump device, the corresponding impeller that constitutes two pumps is connected with same axis, and drives by a motor, thereby can switch the operation (such as referring to the real fair 3-46709 document of JP) of two pumps by the direction of rotation of motor.

The spirality pump is such pump, this pump is provided with suction inlet at the front of the outer cover that is provided with impeller pars intermedia, the side face of shell is provided with outlet, by the rotation of impeller, the water in the middle of the suction inlet intake impeller is discharged in the motion of action of centrifugal force lower edge outer rim and from the outlet that is positioned at side face.

Turbulence type pump is such pump, and this pump is provided with suction inlet and outlet being provided with on the outer cover side face of impeller, and by the rotation of impeller, the blade of impeller produces eddy current, and this eddy current sends water to outlet from suction inlet.

But in the draining pump of dish cleaning machine, people wish that water flows with the bigger impetus, so that residual dish or lubricant component in the draining are attached on the drainpipe.Be in the water when scavenging pump operate owing to clean and rinse the impeller of the draining pump in the pump installation of washing above-mentioned the time, on scavenging pump, just act on like this load is arranged, thereby also can produce and wish to avoid increasing the opposite problem of above-mentioned load.

In addition, clean in above-mentioned and rinse in the pump installation of washing, motor is installed on the outer cover end of turbulence type pump one side by installing component.This installing component is the end that cantilever pin shape is formed at shell, and the overhang of its opposite shell is less, so that do not make the root of above-mentioned cantilever produce stress.

But above-mentioned dish cleaning machine has the tendency of the appearance and size of the higher scavenging pump of frequency of utilization greater than the appearance and size of draining pump.

Yet, when the appearance and size of scavenging pump during, be to be provided with according to the mode that coincides with scavenging pump owing to be positioned at the installing component of draining pump one side greater than the appearance and size of draining pump, be difficult to carry out assembling work from scavenging pump one side like this.Such as, after the end face of motor installs and fixes parts, above-mentioned installing component is installed on this fixed part, and is carried out screw thread from motor one side and tighten fixing.Afterwards, the other way around impeller is installed on the rotating shaft of motor.Consequently, assembly direction not necessarily will reverse assembly parts in assembling process.On the other hand, if consider the transaction capabilities of assembling, people wish in order the each several part of motor or pump to be assembled from a direction.

Therefore, the object of the present invention is to provide a kind of pump installation, this pump installation can solve above-mentioned technical problem, and it is applicable to dish cleaning machine and a plurality of pumps are assembled into one.

To achieve these goals, the pump installation of the described invention of claim 1 comprises outer cover, the 1st impeller and the 2nd impeller, this outer cover form stream chamber the 1st and with stream chamber the 2nd of the 1st stream chamber adjacency, above-mentioned the 1st impeller rotatably is arranged at the 1st stream chamber interior, and above-mentioned the 2nd impeller is connected with the 1st impeller with coaxial manner and rotatably is arranged at the 2nd stream chamber interior; Stream chamber the 1st and the 1st impeller constitute the 1st pump, stream chamber the 2nd and the 2nd impeller constitute the 2nd pump, the driver that is used for driving the 1st impeller and the 2nd impeller is arranged at outer cover, operation by changeable two impellers of the direction of rotation of switching two impellers, it is characterized in that, stream chamber the 2nd is formed with suction inlet and outlet on its side face, the direction that flows towards outlet along water from suction inlet in stream chamber the 2nd narrows down in the part near outlet.

According to said structure, because the water route of stream chamber the 2nd is narrower than the part of close suction inlet in the part near outlet, like this in the part near this outlet, the flow velocity of mobile water improves, and consequently water flows out from outlet with the bigger impetus.

In addition, because the 2nd narrower pump of water route in the stream chamber the 2nd wherein can improve drainability under the situation that does not strengthen the 2nd impeller, even like this 1st when pump operated, in stream chamber the 2nd, have under the situation of water and drive the 2nd impeller, compare with the occasion that improves drainability by the mode that strengthens the 2nd impeller, can not produce load.

The pump installation of the described invention of claim 2 relates to the described pump installation of claim 1, it is characterized in that, stream chamber the 2nd narrows down along the direction that parallels with the rotation of the 2nd impeller.

According to said structure, except the effect of the described invention of claim 1, to compare along the occasion that radially narrows down of impeller with stream chamber the 2nd, the 2nd pump can further be sent water with the bigger impetus.

The pump installation of the described invention of claim 3 relates to the described pump installation of claim 2, it is characterized in that, stream chamber the 2nd is radially narrowing down along the 2nd impeller also.

According to said structure, except the described effect of claim 2, because stream chamber the 2nd can be along narrower with the perpendicular both direction of the flow direction of water, compare with the occasion that narrows down along single direction like this, cross section, above-mentioned stream chamber the 2nd further narrows down, consequently, the 2nd pump can further be sent water with the bigger impetus.

The pump installation of the described invention of claim 4 relates to the described pump installation of claim 1, it is characterized in that, stream chamber the 2nd in the above-mentioned outer cover is separated to form according to the mode less than stream chamber the 1st, this outer cover comprises installing component in addition, this installing component is used for driver is arranged at stream chamber the 2nd one side, and sees according to the mode of avoiding coinciding with two stream chambers from the direction that the rotating shaft with the 2nd impeller parallels and to be provided with.

According to said structure, except the described effect of claim 1,, when being installed on driver on the installing component, can prevent the obstruction of outer cover like this because installing component is provided with according to the mode of avoiding coinciding with the stream chamber.Consequently, wait fixed operation to carry out, thereby the transaction capabilities when assembling is good from the side direction of shell because the screw thread between installing component and the driver is tightened.

The pump installation of the described invention of claim 5 relates to the described pump installation of claim 4, it is characterized in that, above-mentioned outer cover also comprises the rib that is connected with installing component from the boundary member of two stream chambers.

According to said structure, except the effect of the described invention of claim 4, because the rib that is connected with installing component can be strengthened installing component, even be cantilever-shaped so that under the situation of avoiding coinciding with the stream chamber at installing component like this, can prevent that still installing component from deforming.

Particularly, because rib directly is connected with stream chamber the 1st with installing component and it is strengthened, can prevent really that so the relative stream chamber the 1st of installing component from deforming.It in addition, preferably adopts this rib, because also can play booster action to boundary member.

Fig. 1 is the side cutaway view that constitutes substantially of the dish cleaning machine of the pump installation of the suitable employing embodiment of the invention;

Fig. 2 is the side view of the partly cut-away of pump installation shown in Figure 1;

Fig. 3 is the decomposition diagram of pump installation shown in Figure 2;

Fig. 4 is the cross-section front view of pump installation shown in Figure 2, and this figure is the figure that sees along the D-D section among Fig. 2;

Fig. 5 is the cross-section front view of pump installation shown in Figure 2, and this figure is the figure that sees along the E-E section among Fig. 2.

With reference to the accompanying drawings one embodiment of the present of invention are described in detail.Fig. 1 is the side cutaway view that constitutes substantially of the dish cleaning machine of the pump installation of the suitable employing embodiment of the invention.

Dish cleaning machine 1 comprises: its profile be the shell 2 of box, the purge chamber 3 that is separated to form in shell 2 inside, with tableware T remain in 3 inside, purge chamber tableware cage 4, comprise parts such as the pipe 61 that is arranged at shell 2 rear portions, valve 62 water supply mechanism 6, be used for the scavenging pump 51 of 3 internal spray water, be connected with scavenging pump 51 and from the arm 5 of spray-hole 5a injection water towards the purge chamber.

Shell 2 comprises: be arranged at the door 21 to be opened/closed of its front, be arranged at the inner openable box interior groove 22 in the place ahead.The inner bottom part of interior groove 22 is container-like, thus storage of water therein.

Purge chamber 3 surrounds separation by the back of door 21 and the inner face of interior groove 22.Purge chamber 3 can be in its bottom storage of water.In addition, the front portion of 3 bottom forms the water portion 31 with certain depth according to the mode of the water that can collect purge chamber 3 in the purge chamber.Sentence dismountable mode at the inlet 33 of this water portion 31 gauze filter 34 is installed, thereby can will catch by leftovers in the water of this filter etc.

In dish cleaning machine 1, supply equipment (not shown)s such as water supply mechanism 6 and waterpipe are connected, thereby can be by water filling port 32 to purge chamber's 3 private water supplies.The water that is provided is stored in the bottom of purge chamber 3.Scavenging pump 51 is connected with water portion 31 by pipe 55, and water is from 31 suctions of water portion, by manage 57, arm 5 is towards the tableware injection of tableware cage 4 inside.Afterwards, water returns water portion 31, Yi Bian circulate, Yi Bian clean.In addition, arm 5 rotatably is provided with, and it can rotate by the reaction force of injection water, thereby can evenly clean tableware.

In addition, dish cleaning machine 1 comprises the heater 7 that is positioned at 3 bottoms, purge chamber.This heater 7 can heat the water in the purge chamber 3, can clean or rinse and wash by this hot water.In addition, heater 7 can heat ambient air, thereby can carry out drying to tableware by this hot blast.

The pars intermedia of drainpipe 54 is the reverse U shape bending, and this drainpipe extends to the inner top of shell 2.So, utilizing siphonage, the water by drainpipe 54 can not flow through its top, and drainpipe 54 can not stop the circulation of water by valve.In addition, if by draining pump 52, in case water is crossed the top of drainpipe 54, then this water can be discharged by drainpipe 54.In addition, Fig. 1 only shows in the drainpipe 54 from an end and extends to a section of pars intermedia.

In addition, a pump installation 8 is made of scavenging pump 51 and draining pump 52.

In pump installation 8, be provided with motor 9 as its driver.A motor 90 drives scavenging pump 51 and draining pump 52, switches the running of scavenging pump 51 and draining pump 52 according to the direction of rotation of motor 90.

Fig. 2 is the side view of the partly cut-away of pump installation shown in Figure 1, the section of C-C in its presentation graphs 4.Fig. 3 is the decomposition diagram of pump installation shown in Figure 2.Fig. 4 is the cross-section front view of pump installation, and it is the figure that sees along the D-D section among Fig. 2.Fig. 5 is the cross-section front view of pump installation shown in Figure 2, its figure for seeing along the E-E section among Fig. 2.At first, with reference to Fig. 2 and Fig. 3.In addition, below, except the occasion of special instructions, direction refers to the front view to be the direction of benchmark.

Pump installation 8 comprises: the said motor 90 that is arranged at its rear portion, be fixed in the tabular fixed part 91 of motor 90 front end faces, the container-like outer cover main body 83 of fixed part 91 fronts is set, the oil seal 87 that seals between the rotating shaft 90a with outer cover main body 83 and motor 90,2nd impeller 82 chimeric with rotating shaft 90a, be arranged at the tabular enclosure wall 84 of the 2nd impeller 82 front sides, pass the 1st chimeric impeller 81 of enclosure wall 84 and its front side and rotating shaft 90a, admit the outside housing cover 85 of the 1st impeller 81, be located at the O type sealing ring 86 of realizing waterproof sealing between outside housing cover 85 and the outer cover main body 83.

Motor 90 inside are provided with bearing support, and this bearing support rotatably supports its rotating shaft 90a, by this bearing support, rotatably support the 1st impeller 81 and the 2nd impeller 82.

Said pump device 8 can assemble in the following manner.

At first, in the front of motor 90,, pass screw 92 from the place ahead again and be fixed from the place ahead mounting part spare 91.

Then, be installed on the fixed part 91 from the place ahead with outer cover main body 83, from the place ahead screw 93 is passed outer cover main body 83 installing component 83a through hole 83i and it is tightened fixing.

Afterwards, oil seal 87 is passed the rotating shaft 90a of motor 90 from the place ahead, and it is installed on the inside of outer cover main body 83.

Then, in the inside of outer cover main body 83, the 2nd impeller 82 is installed on the rotating shaft 90a of motor 90 in chimeric mode from the place ahead.

Then, from the place ahead O type sealing ring 86 is installed on the flange portion 83d of the front portion of outer cover main body 83.

Afterwards, from the place ahead enclosure wall 84 is installed on the outer cover main body 83 in chimeric mode.At this moment, the 2nd impeller 82 and rotating shaft 90a pass the opening of the pars intermedia that is formed at enclosure wall 84.

Then, from the place ahead in chimeric mode with the 1st impeller 81 according to being installed on the rotating shaft 90a with the coaxial form of the 2nd impeller 82.

Then, outside housing cover 85 is installed on the outer cover main body 83, passes screw 94 from the place ahead again and be fixed from the place ahead in chimeric mode.

The pump installation 8 that forms of assembling is connected with above-mentioned each pipe in the manner described above, and is fixed in below the interior groove 22 of shell 2.

In the manner described above, said pump device 8 can by from what is called forwards to the operation of a direction assemble formation.

The following describes various piece.

Outside housing cover 85 has the container-like main part 85a of formation towards rear aperture, is formed with the flange portion 85d as installation portion at its rear portion.Flange portion 85d is connected with the flange portion 83c of outer cover main body 83 is chimeric by O type sealing ring 86, and it has the through hole that is used for the screw 94 that above-mentioned two flange portion are fixing.

In addition, outside housing cover 85 comprises the upwardly extending mouth tube portion 85c of going out of right part of the outer edge surface of the 85b of placket portion, relative main part 85a that the front pars intermedia of relative main part 85a extends forward.Go out the outlet 71b that mouth tube portion 85c forms scavenging pump 51, the above-mentioned in addition placket 85b of portion forms the suction inlet 71a of scavenging pump 51.

Enclosure wall 84 clampings are arranged between outside housing cover 85 and the outer cover main body 83.The back of enclosure wall 84 extends to the part (in Fig. 4, this part is represented with chain-dotted line 84a) of suction inlet 72a for the upper left quarter of the stream chamber 72 the 2nd that will describe from behind by outlet 72b, and rearward stretches out.In addition, at the pars intermedia formation opening of enclosure wall 84, the rotating shaft 90a of above-mentioned the 2nd impeller 82 and motor 90 passes this opening.

Outer cover main body 83 comprises: the 83e of top cylinder portion that opening extends towards the main part 83d that is the cylindrical vessel shape substantially in the place ahead, from the top along continuous straight runs of the outer edge surface of main part 83d, the 83f of doffing portion that extends from the bottom along continuous straight runs of the outer edge surface of main part 83d, the outer edge surface of main part 83d is arranged at the fixed foot portion 83j of back, the above-mentioned flange portion 83c that extends from the outer edge of the front end of main part 83d relatively.In flange portion 83c, be formed with recessed screwed hole.Be screwed with screw 94 in this recessed screwed hole, this screw 94 is used for fixing with the flange portion 85d of outside housing cover 85.

The 83e of top cylinder portion forms the outlet 72b of draining pump 52.

The 83f of doffing portion forms the suction inlet 72a of draining pump 52, and it is connected with aforementioned tube 56.The inner bottom surface of the 83f of doffing portion is located at the position apart from G (referring to Fig. 4) below the inner edge surface of main part 83d.So, because the inner edge surface of the relative main part 83d of suction inlet 72a is lower, compare with the occasion that does not form like this with lower position, can suck the more water of low water level.In addition, because in the time will sucking than the water of low water level, longer in the time that produces before sucking air, thus can prevent from the efficient of draining pump 52 to be reduced along with the suction of air.The relative inner edge surface of main part 83d in addition is even under the lower situation in the position of the pipe 56 that is connected with suction inlet 72a, still can obtain identical effect.

Fixed foot portion 83j by the erection part (not shown) that extends back of rear portion around main part 83d, from the rear end of this erection part along and the installing component 83a that extends of axially perpendicular direction and be arranged on the installing component 83a rib 83b and with main part 83d monolithic molding.

Extend towards the outside radially the outer edge of the relative main part 83d of installing component 83a, is formed with the patchhole 83i of screw 93 near its end, and this screw 93 is used for fixing motor 90.Above-mentioned patchhole 83i is arranged at such position, sees from the front that under this position the flange portion 83c that can avoid this hole and outer cover main body 83 and the flange portion 85d of outside housing cover 85 coincide.So, can under the situation that two flange portion are hindered, screw 93 be inserted patchhole 83i, thereby be easy to carry out the operation of tightening of this screw.In addition, be because the above-mentioned assembly direction of pump installation 8 is the place aheads of projected direction of the rotating shaft 90a of relative motor 90 why here along positive seeing.In addition, installing component 83a is not limited to the form of avoiding two flange portion to coincide, and it also can constitute in the following manner, and this mode is: screw is passed, and can the hole that tightening tool is operated be made of two flange portion.Crucial is, as long as the inner space that the outer cover 80 of avoiding fixed part 83a and the back that is made of outer cover main body 83, enclosure wall 84 and outside housing cover 85 to describe is separated to form, promptly coincide with stream chamber 71 the 1st and stream chamber 72 the 2nd, just can.

In addition, installing component 83a forms in the following manner, and this mode is: the flange portion 85d of the flange portion 83c of outer cover main body 83 and outside housing cover 85 is not outstanding towards short transverse relatively.The top of fixed part 83a is lower than the top of two flange portion, and the bottom of installing component 83a is higher than the bottom of two flange portion, can control the height of pump installation 8 like this, thereby form the less pump installation of volume.

Near the patchhole 83i of the relative installing component 83a of rib 83b front is connected with the outer edge surface of erection part 83g, main part 83d, the back of flange portion 83c, and fixed part is played booster action, thereby can prevent that it from producing distortion.Rib 83b is arranged in pairs in the both sides of installing component 83a.

In the manner described above, because rib 83b can play booster action to installing component 83a, even be under the cantilever-shaped situation that is formed with longer size, coincides at installing component 83a like this, can prevent that still installing component 83a from producing distortion with the inner space of avoiding itself and outer cover 80.Particularly, because rib 83b is connected with flange portion 83c, thereby installing component 83a directly is connected with outside housing cover 85 and obtains stiffening effect, the distortion of the installing component 83a of the stream chamber 71 the 1st that the back that therefore can prevent from really to be separated to form in outside housing cover 85 inside relatively will be described.

In addition, rib 83b also can play booster action to the flange portion 83c as the boundary member of two stream chambers.Why adopt this mode to be because: be used for the occasion of dish cleaning machine at pump installation 8, owing to reasons such as frequencies of utilization, the size of scavenging pump 51 is greater than draining pump 52.In this occasion, produce above-mentioned two stage portion that flange portion is such in the boundary portion branch of two pumps, or be provided with the coupling part between the parts, consequently the intensity of boundary member can be inclined to and weaken.

Above-mentioned outer cover main body 83, enclosure wall 84 form an outer cover 80 with outside housing cover 85 mutual assemblings.Being separated to form rotatable mode in these outer cover 80 inside admits stream chamber 71 the 1st of the 1st impeller 81, rotatable mode to admit stream chamber 72 the 2nd of the 2nd impeller 82.Relative stream chambers the 1st 72, stream chamber the 2nd, its appearance and size of seeing from the front is less.Boundary member two stream chambers is provided with the flange portion 85d of outside housing cover 85, the flange portion 83c and the enclosure wall 84 of outer cover main body 83.

Formation is separated by the inner face of the main part 85a of outside housing cover 85 and the front of enclosure wall 84 in stream chamber 71 the 1st.As shown in Figure 5, stream chamber 71 the 1st is according to the suction inlet 71a from the centre, and the helical form that extends to the outlet 71b of outer edge forms, and portion is provided with the 1st impeller 81 therebetween.

The 1st impeller 81 is for having the rotary blade of forniciform blade.If the rotation of the 1st impeller, then its blade can extrude the water of central part towards outer rim.The 1st impeller 81 constitutes scavenging pump 51 with stream chamber 71 the 1st.

The helicoidal pump of above-mentioned scavenging pump 51 for being used for water is sucked and discharges from the outer edge of spiral from spiral helicine pars intermedia.According to mode shown in Figure 5, if the 1st impeller 81 then will push towards outer rim from the water that suction inlet 71a sucks, thereby it can be discharged towards outlet 71b along the counter clockwise direction rotation of seeing from the front.

The 2nd impeller 82 is for having the armature of a plurality of radial blades.If 82 rotations of the 2nd impeller, the recess that forms between blade produces spiral around it, thereby the water generates around it is moved.The pars intermedia of the 2nd impeller 82 has embedded hole, and the rotating shaft 90a of motor 90 is fixed in this hole, and is arranged at the pars intermedia of the main part 83d of outer cover main body 83.

Stream chamber 72 the 2nd is made of the inner face of the main part 83d of outer cover main body 83 and the back separation of enclosure wall 84.Stream chamber 72 the 2nd is in the outer rim along the 2nd impeller 82 and extend to (left part of the rotating shaft 90a Fig. 4 relatively) between the scope of outlet 72b from suction inlet 72a, thus along with the 2nd impeller 82 along clockwise rotation among Fig. 4, can make current logical.At above-mentioned range section, promptly reduce gradually in the outer rim along the 2nd impeller 82 and the cross section that extends to the stream of outlet 72b from suction inlet 72a.Therefore, the spacing between the outer edge surface of the inner face of main part 83d and the 2nd impeller 82 is little in the part near suction inlet 72a at the part ratio near outlet 72b.In addition, near the part (the top side part F among Fig. 4) of outlet 72b, because enclosure wall 84 stretches out in the back, above-mentioned spacing is that fore-and-aft direction narrows down along the 2nd bearing of trend of taking turns 82 rotating shaft.In addition, the part that is separated to form for outer edge surface by the inner edge surface of the main part 83d of outer cover main body 83 and the 2nd impeller 82, part (the right side part relative with rotating shaft 90a among Fig. 4) between outlet 72b and suction inlet 72a, above-mentioned spacing is according to the logical mode of current is narrowed down.

Draining pump 52 is made of stream chamber 72 the 2nd and the 2nd impeller 82, and this pump 52 makes the turbulence type pump of its water motion on every side for the impeller in the indoor generation rotation of stream wherein.When the 2nd impeller 82 rotates along the clockwise direction of seeing from front shown in Figure 4, can discharge towards the outlet 72b of top from the water that the suction inlet 72a of below sucks.On the other hand, when the 2nd impeller 82 rotated along the counter clockwise direction of seeing from the front, from the outlet 72b suction water of top, and outlet 72b was connected with drainpipe 54, the draining air pump inoperative.

In the manner described above, because in draining pump 52, stream chamber 72 the 2nd is at the part broad near suction inlet 72a, and it is particularly narrower at part F in part near outlet 72b, increase by the flow velocity of the water of the 2nd impeller 82 drives at this part F, consequently, above-mentioned water can flow out with the bigger impetus from outlet 72b.Therefore, in dish cleaning machine,, so preferably can prevent from stream, to adhere to dirt owing to suppose that the water by draining pump 72 is polluted.

In addition, because the narrower draining pump 52 in water route of stream chamber 72 the 2nd wherein can improve drainability under the situation that does not strengthen the 2nd impeller 82, even like this when scavenging pump 51 operation, have in stream chamber 72 the 2nd under the situation of water and drive the 2nd impeller 82, compare with the occasion that improves drainability by the mode that strengthens the 2nd impeller 82, can not produce load.Therefore, when scavenging pump 51 operations, can prevent from remaining load is applied on the motor 90, consequently, can prevent that the performance of scavenging pump 51 from reducing, and guarantee the cleaning performance of dish cleaning machine.

In addition, because stream chamber 72 the 2nd narrows down along fore-and-aft direction at part F place, draining pump 52 can further be sent water with the bigger impetus like this.

Have again, because stream chamber 72 the 2nd is in the part near outlet 72b, along radially narrowing down of fore-and-aft direction and the 2nd impeller 82, such stream chamber 72 the 2nd can be along narrowing down with perpendicular 2 directions of the flow direction of water, thereby with compare along the unidirectional occasion that narrows down, above-mentioned stream chamber the 2nd can further narrow down.Consequently, draining pump 52 can further be sent water with the bigger impetus.

If implement present embodiment in the manner described above, as shown in Figure 5,, when motor 90 is installed on the installing component 83a, can prevent the obstruction of outer cover 80 like this because the installing component 83a in the shell 80 is provided with according to the mode of avoiding coinciding with two stream chambers.Consequently and since installing component 83a be installed on screw thread between the fixed part 91 on the motor 90 fixing operation such as fix can be from carrying out as the place ahead of outer cover 80 side direction, the transaction capabilities during assembling is good.Such as, the assembly direction of pump installation 8 can be set at opposite shell 80 sides unidirectional of the installation direction that constitutes each impeller, like this need not be in assembling process with the direction counter-rotating of component parts such as pump or motor.In addition, general motor 90 is than pump installation 8 weights.Therefore, can under the state of placing above-mentioned heavier motor 90 gently, pump installation 8 be assembled.

But, the occasion that deforms at installing component 83a, for prevent be installed on installing component 83a on each impeller of being connected of motor 90 and shell 80 both collide mutually, must spacing between the two be set at higher value, consequently, can not improve the efficient of each pump.Can prevent that according to wherein rib 83b installing component 83a from producing the present invention of distortion,, thereby can improve the efficient of each pump because the spacing between each impeller and the shell 80 do not increase.

In addition, in scavenging pump 51, because stream chamber the 1st 71 relative draining pumps 52 are positioned at position away from motor 90, and the 1st impeller 81 is supported on by being in the free end side supporting of cantilever position, can produce the tendency of the assembly precision reduction of stream chamber 71 the 1st like this.In above-mentioned scavenging pump 51, can prevent the present invention that the relative stream chamber 71 the 1st of installing component 83a deforms by rib 83b, assembly precision between impeller 81 and the stream chamber 71 the 1st can be improved by installing component 83a, thereby the efficient of scavenging pump 51 can be improved.

In addition, fixed part 91 or installing component 83a see that from the side the profile of two flange portion of motor 90, outer cover main body 83 or outside housing cover 85 is not outstanding relatively.So,, the volume of dish cleaning machine 1 is reduced even under the situation that installing component 83a is provided with according to the mode of avoiding coinciding with the stream chamber, still can control to the height of pump installation 8.

Also have, pump installation 8 comprises the motor 90 as its driver, but is not necessarily limited to this mode.Such as, said pump device 8 also can constitute in the following manner, and this mode is: the 2nd impeller 82 rotatably is supported on the shell 80 by bearing support, and is connected with rotating shaft 90a by connector.Crucial is to be provided with in adjacent mode with the 2nd pump that is equivalent to draining pump 52 as long as be equivalent to the 1st pump of above-mentioned scavenging pump 51, just and can by a driver drives.

In addition, in the scope that does not change essence of the present invention, can carry out various design alterations.

According to invention claimed in claim 1, can obtain following effect. That is, because the water route of stream chamber the 2nd Relatively near the part of suction inlet, narrow down in the part near outlet, like this in the part near outlet, The flow velocity of the water that flows increases, and consequently, this water can flow out with the bigger impetus from outlet. In addition, by The 2nd narrower pump of water route in wherein stream chamber the 2nd can improve draining in the situation that does not strengthen the 2nd impeller Ability, though like this 1st when pump operated, in stream chamber the 2nd, have in the situation of water and drive the 2nd impeller, Compare with the occasion that improves drainability by the mode that strengthens the 2nd impeller, can not produce load. So, Can prevent that unnecessary load acts on the driver the 1st when pump operated.

According to invention claimed in claim 2, except the effect of invention claimed in claim 1, because Stream chamber the 2nd narrows down along the direction of rotating shaft, and such stream chamber the 2nd can further be sent water with the bigger impetus Go out.

According to invention claimed in claim 3, except the effect of invention claimed in claim 2, because Stream chamber the 2nd is along narrowing down with the perpendicular both direction of the flow direction of water, and its cross section further becomes like this Narrow, thus the 2nd pump can further be sent water with the bigger impetus.

According to invention claimed in claim 4, except the effect of invention claimed in claim 1, because Installing component arranges according to the mode of avoiding coinciding with the stream chamber, is installed on the installing component at driver like this The time screw thread the fixed operation such as tighten and can carry out from the side direction of outer cover, thereby the transaction capabilities during assembling is good.

According to invention claimed in claim 5, except the effect of invention claimed in claim 4, because Can strengthen installing component by rib, can prevent that like this installing component from deforming. Particularly, with installing component and The direct-connected rib in stream chamber the 1st can prevent really that the relative stream chamber the 1st of installing component from deforming. In addition, Preferably adopt this rib, in order to also boundary member is strengthened.

Claims

1. pump installation, it comprises outer cover, the 1st impeller and the 2nd impeller, this outer cover be separated to form stream chamber the 1st and with stream chamber the 2nd of the 1st stream chamber adjacency, above-mentioned the 1st impeller rotatably is arranged at the 1st stream chamber interior, and above-mentioned the 2nd impeller is connected with the 1st impeller with coaxial manner and rotatably is arranged at the 2nd stream chamber interior; Stream chamber the 1st and the 1st impeller constitute the 1st pump, stream chamber the 2nd and the 2nd impeller constitute the 2nd pump, and the driver that is used for driving the 1st impeller and the 2nd impeller is arranged at outer cover, by switching the direction of rotation of two impellers, the operation of changeable two impellers is characterized in that:

Stream chamber the 2nd is formed with suction inlet and outlet on its side face, the direction that flows towards outlet along water from suction inlet in stream chamber the 2nd narrows down in the part near outlet.

2. pump installation according to claim 1 is characterized in that, stream chamber the 2nd narrows down along the direction that parallels with the rotation of the 2nd impeller.

3. pump installation according to claim 2 is characterized in that, stream chamber the 2nd is radially narrowing down along the 2nd impeller also.

4. pump installation according to claim 1, it is characterized in that, stream chamber the 2nd in the above-mentioned outer cover is separated to form according to the mode less than stream chamber the 1st, this shell comprises installing component in addition, this installing component is used for driver is arranged at stream chamber the 2nd one side, and sees according to the mode of avoiding coinciding with two stream chambers from the direction that the rotating shaft with the 2nd impeller parallels and to be provided with.

5. pump installation according to claim 4 is characterized in that, above-mentioned outer cover also comprises the rib that is connected with installing component from the boundary member of two stream chambers.