DE4244458A1 - Electric pump supplying by=pass air to vehicle catalytic converters - circulates air inside motor case for cooling of motor, and has noise absorbers in air suction port - Google Patents

Abstract

The turbulence pump (41) consists of a motor (43) and a pump propeller (42). The motor and the propeller are linked with a shaft (45) rotating on two bearings (46). A rotor (47) is fixed on the shaft. A stator (48) is clamped on the motor case (43a). An IC sensor (49) detects the magnetic poles of motor. When the propeller is rotated by the motor the air is sucked from an inlet port (52). The air circulates through the motor and flows to the pump section from a small opening (53) between the motor case and pump case. The compressed air outlet is on the periphery of the pump case (41a). A sound absorber (54) next to the air inlet port reduces noise level. USE/ADVANTAGE - For supplying bypass air to vehicle catalytic converters. Higher life time, lower noise.

Description

The invention relates to an electric pump, the with a motor to drive a propeller combi is niert and to the supply of secondary air a catalyst converter used for a vehicle can be, and especially an electric pump for the secondary air supply using a Vortex pump.

There has long been a legal obligation Pollutants in the exhaust gases of a motor vehicle to keep as low as possible; the requirements the exhaust gas purification have been off in recent years Environmental protection ever bigger.

When used in the exhaust gas cleaner of a modern engine vehicle takes the effectiveness of a catalytic converter when the reaction temperature is low. Demge  the exhaust gas would be moderate if its temperature at start the machine is low than hydrocarbon (HC) and carbon monoxide (CO), which does not adequately oxidize are released into the atmosphere. To avoid this that, it is common practice to secondary air to the Kata to deliver analyzer converter to the oxidation of HC and to facilitate CO with excess oxygen. Because only a small amount of nitrogen oxide (NOx) is generated detects when the machine temperature is low, it is possible to add a limited value yourself to get excess oxygen. By taxes It is possible to adjust the amount of secondary air supplied to improve the ability to clean exhaust gases, if the catalyst due to the low temperature is not effective.

What is required for the supply of secondary air The behavior of the pump is such that it is stable Flow rate under different conditions can be ensured.

So far, a centrifugal pump has been used for the feed the secondary air used.

Fig. 1 shows the cross section of a conventional electric pump for the supply of secondary air.

As shown in Fig. 1, the known elec tric pump has a centrifugal pump 1 and a motor 2 connected thereto. A centrifugal turbine wheel 4 is attached to one end of a shaft 3 of the motor 2 .

A pump housing 1 a has an inlet opening 5 at a position corresponding to the motor shaft 3 and an outlet opening 6 in a peripheral region.

The motor shaft 3 is carried by the motor housing 2 a and the pump housing 1 a each via bearings 8 . A commutator 9 and an armature 10 are attached to the motor shaft 3 . A pair of brushes 11 are pressed against the commutator 9 by a pair of springs 12 . On the inner surface of the motor housing 2 a, a magnet is attached in alignment with the armature 10 .

In this known arrangement, when the Turbi nenrad 4 of the centrifugal pump 1 is rotated by the motor shaft 3 , the suction air is compressed via the inlet opening 5 and then ejected in a compressed state through the outlet opening 6 . This compressed air is then carried as secondary air to a catalyst converter (not shown).

The electric pump for feeding secondary air to the catalyst converter requires a suitable one Air supply amount, so that the temperature of a Ka talysators are not lowered, and also requires an adequate air supply pressure to the second to convey digestion air to the catalyst converter. Next There is a requirement for the electric pump that the air supply pressure in a wide range ent can be changed according to the exhaust gas pressure.

However, as shown in Fig. 2, the known electric pump using the centrifugal pump 1 has such a characteristic that when the pressure P of the supplied air is increased, the flow amount Q drastically decreases. Accordingly, it is difficult to control the supply of the secondary air with respect to an appropriate flow amount Q to the catalyst converter and an appropriate pressure P, and also to change the pressure of the supplied air in a wide range while maintaining an appropriate flow amount Q. Thus, a pressure / flow characteristic, which is suitable for a secondary air supply to the catalyst converter, cannot be obtained, so that the catalyst converter cannot clean the exhaust gas sufficiently.

In addition, the turbine wheel 4 of the centrifugal pump has a high rotational speed and therefore a short service life.

In addition, in the known electric pump, since there are no means for preventing or delaying a temperature rise of the motor 2 , the motor has a low efficiency and a short life.

In the known electric pump that uses a brush motor, the brush 11 generates heat due to the friction with the rotating commutator 9 . The abrasion of the brush 11 is an essential factor for determining the life of the brush motor, ie the life of the electric pump; the degree of abrasion increases with increasing temperature due to the frictional heat. In particular, when the brush motor is in a motor housing 2 a tightly housed 2, the temperature rise is the Bür ste 11 very large.

The known electri using a brush motor pump has a short lifespan. He continues  it generates considerable noise due to the friction between the brush and the rotating commutator.

In this known pump, the lateral play of the impeller 4 and thus the gap between it and the pump housing 1 a has a significant importance for the performance of the pump. The narrower the gap, the greater the performance; To form a narrow gap, high part accuracy and high assembly accuracy are required. Accordingly, this narrow gap significantly deteriorates productivity and thus increases production costs.

It is therefore the object of the present invention an electric pump with a pressure / flow cha to create characteristics that are suitable for the Secondary air supply to a catalyst converter of a motor vehicle that has a long service life and causes an increased efficiency of an engine.

According to a first aspect of the invention, we are Belpump provided for the secondary air supply, which has: a motor housing in which a Motor is arranged and be an inlet opening sits, through which outside air is brought in; a Pump housing, in which one rotates through the motor bares impeller is mounted and an outlet tion through which compressed air is emitted will encounter; wherein at least a part of the motorge forms a channel through which the inside led air flows in which part of the engine is exposed.  

Since this pump is a vortex pump, it varies Flow rate only in a small range for changes in the pressure of the supplied air. On Due to this property, the secondary air supply tion can be easily controlled in such a way that a appropriate air flow that is the temperature of the kata lysators not degraded, with adequate pressure is promoted. This air supply pressure can be in can be changed over a wide range, with a ge proper flow rate is maintained.

The vortex pump has a lower rotational speed speed of the impeller compared to the centrifugal pump pe and therefore a longer service life.

Since the air flow channel is formed in the engine this automatically through the air flowing through cooled when the pump is in operation, causing the Motor efficiency increases and a longer Le life is obtained.

Therefore, this vortex pump can exhaust the catalytic converter Clean the converter properly.

According to a second aspect of the invention, one is Vortex pump provided, which comprises: a motor; a pump housing; a rotated by the engine impeller arranged in the pump housing; and a Sealing device for sealing surfaces of the impeller and of the pump housing, which is circular around the axis of rotation the impeller is arranged and an annular Groove either on the impeller or the pump housing and an annular bump on top of each other these parts for engaging the groove with one has a small predetermined gap.  

According to a third aspect of the invention, one is Vortex pump provided, which comprises: a motor; a pump housing; a rotated by the engine impeller arranged in the pump housing; and a Sealing device for sealing surfaces of the impeller and of the pump housing, which is circular around the axis of rotation the impeller is arranged and an annular Groove on the pump housing, an annular seal member of resin or the like in the groove and a elastic part made of rubber or the like, which is between the sealing surface of the pump housing and the Sealing member is arranged to this against the screen pressing surface of the impeller contains.

According to a fourth aspect of the invention, one is Vortex pump provided, which comprises: a motor; a pump housing, a motor-driven, rotating impeller arranged in the pump housing; and a Sealing device for sealing surfaces of the impeller and of the pump housing, which is circular around the axis of rotation the impeller is arranged and an annular Groove on the pump housing and an annular seal contains resin or the like in the groove, the groove partially having a pressure introduction area forms that in conjunction with a wind tunnel of the pump dung is.

Because the escape of air by pumping on housing or the impeller trained elevation ver is prevented, it is in the prescribed arrangement tion according to the present invention possible that achieve the same result as with a narrowed Gap of the sealing surface.  

Because the escape from flowing over the sealing surface Air through the action of the elastic part and the Sealing member in the annular groove is prevented, it is still possible to get the same result achieve as with a narrowed gap of the sealing surface che.

Because the escape of air by blowing the air that is compressed by the rotation of the impeller, from the pressure introduction area via the sealing member to the sealing member against the side surface of the impeller pressing is prevented, it is still possible to achieve the same result as with one narrowed gap of the sealing surface.

Since the sealing member prevents this sealing structure changes that compressed air ent to the low pressure side gives way, the efficiency can be prevented the pump is reduced. Because this degradation the efficiency is prevented without a Part accuracy and assembly accuracy required it is possible to manufacture a pump that has a very simple structure and therefore with low cost can be manufactured.

According to a fifth aspect of the invention, the electric pump using a brush motor on: a motor housing in which a motor is arranged and which has an inlet opening through which Outside air is absorbed; a pump housing, in which is an impeller driven by the motor is rotatably arranged and the one outlet opening through which compressed air is expelled becomes; wherein at least a part of the motor housing inside ren forms a channel through which the introduced  Air flows and in which at least part of the engine is exposed. This arrangement prevents any Temperature increase of the brush.

According to a sixth aspect of the invention, the electric pump an inlet channel through which Outside air is led to the suction opening, and egg NEN exhaust duct through which compressed air from the outlet opening flows, the inlet channel and / or the outlet duct cover the motor housing. This arrangement prevents both tempera as well as a sound of the brush of the mo tors.

Because the air flow channel passes through the brush stretches the brush through the air flow channel flowing outside air cooled when the motor driven pump is in operation, whereby prevents any temperature rise of the brush becomes. As a result, it is possible to live increase brush motor duration, d. H. the life duration of the electric pump.

Since the housing of the brush motor from the inlet and the outlet duct is covered, it is possible from Brush motor to suppress outgoing noise.

The invention is described in the following in the Figures illustrated embodiments closer explained. Show it:

Fig. 1 is a cross-sectional view of a known electric pump for kundärluftzuführung Se,

Fig. 2 is a diagram of the pressure / Strömungsmen gen-relationship with the known elec tric pump,

Shows a system diagram of a known improved feed unit. 3 for the secondary air,

Fig. 4 is a cross-sectional view of an electric pump for Sekundärluftzu guide according to a preferred embodiment of the invention,

Fig. 5 is a diagram of the pressure / Strömungsmen gen-relationship of the electric motor shown in Fig. 4,

Fig. 6 is a cross sectional view of a pump which is equipped with an absorbing silencers,

Fig. 7 is a cross sectional view of a pump which is equipped with a resonance sound damper,

Fig. 8 is a cross-sectional view of an electric pump with a motor brush according to the invention,

Fig motor. 9 is a cross-sectional view of an electric pump with a brush to which an inlet channel and an outlet channel are arranged around,

Fig. 10 is a cross sectional view of the elec tric motor of Fig. 9, which is equipped with a white terhin absorption silencers,

FIG. 11A is a cross sectional view of the elec tric motor of Fig. 10, which is equipped with a white terhin resonance Schalldämp fer,

FIG. 11B is a cross sectional view of the Reso resonance muffler,

Fig. 12 is a partial cross-sectional view of a vortex pump with a sealing device according to the invention,

Fig. 13 is a partial cross-sectional view of the sealing apparatus of FIG. 12,

Fig. 14 is a partial cross-sectional view of a vortex pump with a modified sealing device of the invention,

Fig. 15 is a partial cross-sectional view of the modified sealing device of Fig. 14,

Fig. 16 is a partial cross-sectional view of a further modified sealing device according to the invention,

Fig. 17 is a schematic plan view of the vortex pump according to Fig. 16,

Fig. 18 is a partial cross-sectional view of still another modified Dichtvor device according to the invention,

Fig. 19 is a schematic plan view of the belpumpe We of FIG. 18,

FIG. 20 is a perspective view of all common impeller, and

Fig. 21 is a plan view of an impeller in which the blades are arranged in staggered distances.

Fig. 3 is a system diagram of an improved secondary air supply unit which is at a Ver a motor vehicle brennungsmaschine used. Air passed through an air filter 22 is measured by an air flow meter 26 and enters a settling tank 28 via a throttle body 27 , in which a throttle valve for adjusting the engine output is arranged. The air is then taken up by an internal combustion engine 30 via an intake manifold 29 . The exhaust gases that have driven the internal combustion engine 30 pass through two catalyst converters 23 via an exhaust manifold 24 and are then ejected from an exhaust pot 31 . A secondary air introduction line 21 is connected to the air filter 22 , to which an electric pump 33 , a return check valve 35 and a control valve 36 are connected. A motor 38 is connected directly to the electric pump 33 . The control valve 36 is connected on one side to the exhaust manifold 24 and on the other side to the catalytic converter 33 to the muffler 31 . The motor 38 is driven by a command signal from a computer 32 which processes data from a detector 37 , and is connected to a drive unit 34 which is provided with a battery 39 .

In operation, the air is carried from the air filter 22 to the combustion engine 30 , whereupon exhaust gases are sent to the exhaust manifold 24 . Meanwhile, the drive of the electric pump 33 is controlled by a command signal from the computer 32 , which performs arithmetic operations such as the exhaust gas temperature, the pump pressure, the water temperature, the rotational speeds and the boost pressure, which are detected by the detector 37 , where by a suitable flow of fresh air from the air filter 32 is discharged from the electric pump 33 . This air is the multiple catalyst wall learn 23 leads directly or via the exhaust manifold 24 to improve the function of the individual catalyst wall learners 23 .

Various preferred embodiments will now be described play an electric pump that is used in the previous mentioned internal combustion engine can be used, be wrote.

example 1

FIG. 4 shows a first exemplary embodiment in which the electric pump for the secondary air supply (hereinafter referred to as "the electric pump") has a vortex pump 41 and a motor 43 connected to it for rotating an impeller 42 . The vortex pump 41 has a first and a second pump housing 41 a, 41 b, which are connected to a motor housing 43 a, the second pump housing 41 b serving as a bellhousing. The shaft 46 of the motor 43 is carried by the second pump housing 41 b and the motor housing 43 a via bearings 46 , 46 . The impeller 42 is fixed on the pump-side end of the shaft 45 .

The motor 43 is a brushless motor, in which a rotor 47 is fixed on the shaft 45 and a stator core 48 is carried by the second pump housing 41 b. A detector IC 49 is held by the motor housing 43 a to detect the magnetic poles of the motor 47 . In this brushless motor, the shaft 45 rotates when a coil, not shown, wound around the stator core 48 is energized.

As a further feature of the electric pump, the motor housing 43 a has an inlet opening 50 , which is connected to an air flow channel 51 in the motor 43 . The inlet opening 50 is formed in the motor housing 43 a at the opposite end of the pump 41 . The inlet opening 50 is also connected to a tubular channel 52 . The second pump housing 41 b between the pump 41 and the motor 43 has an air opening 53 . An outlet, not shown, is formed in the peripheral surface of the pump housing 41 a.

When the impeller 42 of the pump 41 is rotated by the motor 43 , the pump 41 compresses the air sucked in from the inlet opening 50 via the air flow channel 51 in the motor 43 and delivers this compressed air as secondary air from the outlet opening, not shown, to a catalyst converter.

By using the swirl pump 41 , it is possible to obtain a pressure / flow rate relationship that is suitable for the secondary air supply to a catalytic converter of a motor vehicle. In particular, as shown in Fig. 5, the air flow Q changes with respect to the magnitude of the change in the air pressure P only to a small extent; when the pressure P er is increased, the flow Q decreases slightly. Accordingly, it is possible to easily control the pressure and the flow so that the secondary air is supplied at an appropriate pressure P and an appropriate flow amount Q so that the temperature of a catalyst is not lowered. It is also possible to change the air pressure P over a wide range while keeping the flow Q at an appropriate value. As a result, the catalyst converter can purify the exhaust gases in a suitable manner.

The impeller 42 of the vortex pump 41 has a low rotational speed in comparison to the centrifugal pump and thus a long service life.

Characterized in that the air flow channel 51 is formed in the motor housing 43 a, it is possible to cool the motor 43 by the air flowing through the air flow channel when the electric pump is in operation, thereby improving the efficiency and life of the motor 43 the life of the electrical pupil. Because of the high efficiency of the motor 43 , it can be downsized.

In this embodiment, the inlet opening and the outlet opening are formed in the motor 43 and in the pump 41 . Alternatively, the inlet opening in the pump 41 and the outlet opening in the motor 43 may be formed, whereby an improved cooling effect for the motor 43 due to the air flow passage 51 is also obtained.

If the motor 43 is a brushless motor, it is possible to increase the life of the motor 43 because there is no frictional contact between a brush and a mutator. Since there is still no abrasion due to the friction, dust is prevented from entering the pump 41 , through which an error could occur, even if the inlet opening and the outlet opening in the motor 43 and the pump 41 are formed.

Example 2

FIGS. 6 and 7 show a second game Ausführungsbei, in which the motor 43 of the electric pump of FIG. 5 is also equipped with silencers 54, 55, 56. In Figs. 6 and 7 are Tei le which correspond to those in the first embodiment of Figure 5, provided with the same reference numerals. their description is therefore omitted here.

In the electric motor of FIG. 6 is a Absorp tions muffler 54 is disposed in a sound absorbing material in the channel 52 with the inlet port 50 of the motor housing 43a is connected. When using this absorption muffler 54 , it is possible for the engine noise emerging from the channel 52 to be absorbed and reduced.

In the electric motor of FIG. 7 resonance silencer 55, 56 are arranged in the engine 43 and in the channel 52 at. Each resonance muffler 55 , 56 has a multi-hole plate 55 b, 56 b, each of which is fastened in an opening in a cut-out area 55 a, 56 a. For sound with different frequencies, which are determined by the size and shape of the cut out areas 55 a, 56 a and the holes 55 c, 56 c of the multi-hole plates 55 b, 56 b, a mutual resonance occurs leads to sound absorption. By using the cut-out areas 55 a, 56 a, which are formed in the motor-side surface of the second housing 41 b and the inner surface of the channel 52 , the silencers 55 , 56 are each inserted by inserting the multi-hole plates 55 b, 56 b the openings of the cut out areas che 55 a, 56 a formed.

With these resonance silencers 55 , 56 , in which the size and shape of the cut-out areas 55 a, 56 a and the holes 55 c, 56 c of the multi-hole plates 55 b, 56 b are appropriately predetermined, it is possible to to reduce the noise of the motor 43 , in particular the high-frequency noise that is unpleasant for the ear.

Example 3

Fig. 8 shows a third embodiment in which the electric pump has a vortex pump 61 (hereinafter referred to as "the pump") and a brush motor 63 connected to it (hereinafter referred to as "the motor") for rotating an impeller 62 of the pump 61 . The pump 61 has a pump housing 61 a, which is connected to a motor housing 63 a. The shaft 64 of the motor 63 is held by the pump housing 61 a and a rear cap 63 b of the motor housing 63 a via bearings 65 , 65 . The impeller 62 is attached to the pump end of the wel le 64 .

The pump housing 61 a has an outlet opening 84 for compressed air, to which an extension 85 is attached.

A commutator 80 and armature 77 are mounted on shaft 64 of motor 63 and a pair of brushes 82 are normally pressed against commutator 80 by spring 83 . A magnet 48 is attached to the inner surface of the motor housing 63 a in radial alignment with the armature 77 .

With this arrangement, when a current is supplied to the armature 77 via the brush 82 and the commutator 80 , the shaft 64 of the motor 63 rotates the impeller 62 of the pump 61 . Accordingly, the pump 61 compresses the air drawn in through the inlet port 70 and pushes it out through the outlet port 84 .

In this electric pump, the brush 82 and the commutator 80 are arranged in the rear region of the motor 63 , ie on the side opposite the vortex pump 61 . The rear cap 63 b of the motor housing 63 a has an inlet opening 70 for outside air in alignment with the brush 82nd Thus, the pump housing 61 a has only one outlet opening 84 for compressed air, to which the extension 85 is attached.

If the inlet opening 70 and the outlet opening 84 are formed in the motor housing 63 a or pump housing 61 a, there is an air flow channel 71 in the motor housing 63 a, which extends from the inlet opening 70 via the brush 82 to the pump 61 . In this example approximately exporting is a hole 73 in the pump housing 61 housing a, to connect the air flow channel 71 to the pump 61st

When the impeller 62 driven by the motor 63 of the pump 61 rotates, the pump 61 compresses the outside air that has flowed through the air flow channel 71 in the motor housing 63 a, and then conveys the compressed air via the outlet opening 84 to a vehicle catalytic converter or the like . At this time, the brush 82 of the motor 63 is cooled by the outside air flowing through the air flow passage 71 . Accordingly, the temperature of the brush 82 can be prevented from rising due to the friction with the rotating commutator 80 . As a result, it is possible to reduce the degree of friction of the brush 82 to extend the life of the motor 63 , that is, the life of the electric pump.

Example 4

Fig. 9 shows an electric pump according to the fourth embodiment.

In this electric pump there are a brush 92 and a commutator 90 in the front area of the motor 63 , ie on the pump 61 facing the te. The motor housing 63 a has an inlet opening 93 , which is slightly offset to the rear relative to the brush 92 . The pump housing 61 a has a rear opening 94 . In the motor housing 63 a, an air flow channel 91 is formed, which it extends from the inlet opening 93 via the brush 92 to the pump 61 . In the same way as in the third exemplary embodiment, there is a hole 98 in the pump housing 61 a in order to connect the air flow channel 91 to the pump 61 .

An inlet duct 100 for guiding outside air to the inlet opening 93 and an outlet duct 101 for the passage of compressed air from the outlet opening 94 cover the motor housing 63 a. The outlet channel 101 forming plates cover the rear cap 63 b of the motor housing 63 a completely and the water is integrally formed with the inlet channel 100 . The approaches 102 , 103 are directed rearward at the openings 100 a, 101 a of the inlet and outlet channels 100 , 101 attached.

In this embodiment, as in the third embodiment, the brush 92 of the motor 63 is air-cooled by the outside flowing through the air flow passage 91 . Accordingly, the temperature of the brush 92 can be prevented from rising due to the friction with the rotating commutator 90 . As a result, it is possible to reduce the degree of friction of the brush 92 to extend the life of the motor 63 , that is, the life of the electric pump.

Since the motor housing 63 a is covered by the inlet and outlet channel 100 , 101 , it is possible to keep noise emerging from the motor 63 as low as possible, for example the friction noise between the brush's 92 and the rotating commutator 90 .

Example 5

Fig. 10 shows a fifth embodiment in which the electric pump according to the fourth embodiment in Fig. 9 additionally has a sound absorber 103 , which is attached to the inner wall of the inlet channel 100 .

Partly by the fact that the motor housing 63 a is covered by the inlet and outlet channels 100 , 101 and partly by the fact that the sound absorber 103 is arranged in the inlet channel 100 , the sound emerging from the inlet opening 93 can be received by the sound absorber 103 , thereby the noise is further reduced compared to the electric pump according to the fourth embodiment.

As in the fourth embodiment, it is possible to increase the life of the electric pump due to the air flow passage 71 .

Example 6

Fig. 11 A shows a cross-sectional view of an elec trical pump according to the sixth embodiment, and Fig. 11B contains a partial enlarged view of Fig. 11A.

In this embodiment, the electric pump according to the fourth embodiment has, in addition to the sound absorber 103, a resonance muffler 104 attached to the motor housing 63 a.

The resonance muffler 104 has a resonance chamber 104 a with holes 104 b through which the sound penetrates into the resonance chamber 104 a. The sound with a frequency determined by the size and shape of the resonance chamber 104 and the holes 104 b can be damped. The resonance muffler 104 is formed by a perforated part 105 , which is attached to the motor-side surface of the pump housing 61 a and has a substantially C-shaped cross section.

With this resonance muffler 104 , the engine noise, in particular the high frequency components unpleasant for the ear, can be selectively reduced, so that it is possible to keep the noise in comparison to the electric pump according to the fourth exemplary embodiment even lower.

This electric pump is like the third and fourth embodiment possible their lives lengthen due to the air flow channel.

Example 7

Fig. 12 contains a cross-sectional view of a vortex pump according to the seventh embodiment, and Fig. 13 shows an enlarged partial view of Fig. 12, which shows a sealing region. This exemplary embodiment relates to a sealing device for preventing the escape of air from the high-pressure part into the low-pressure part of the pump.

An impeller 150 is fixed on the output shaft 123 of the motor by means of a nut 129 and has a cut-out groove 151 to rotate the air sucked in around the wing 150 . The impeller 150 is covered by a housing 153 so that the escape of air is prevented. Two wind tunnels 154 , 155 are formed in a housing 152 and the housing 153 , respectively, such that they face the cut-out grooves 151 . On the housing 153 , a lass approach 156 is attached for the suction of air from an air filter, and an outlet approach 157 for the outlet of the compressed air. Between the side surfaces of the impeller 150 and sealing surfaces 158 , 159 , ie the inner surfaces of the housings 152 and 153 , narrow gaps 160 are provided.

As an essential feature of the invention, as shown in FIG. 12, the impeller 150 has a cutout 161 in its side surface. The Gehäu se 153 has a projection 162 in the approach-side sealing surface 158 , which is in engagement with the cutout 161 of the impeller 150 while maintaining the narrow gap 160 . In the same way, the housing 153 has a jump on the engine-side sealing surface 163 , which is aligned with the cutout 161 of the wing 150 and which has a height which is greater than the width of the gap 160 . The relationship between the cutout and the protrusion is by no means limited to that shown in this embodiment; for example, the cut can be provided in the housing and the projection on the impeller.

In operation, the air drawn in via the inlet lug 156 enters the cut-out grooves 151 of the impeller 150 and is rotated by the impeller 150 . Since the impeller 150 rotates, the air is gradually compressed and is then expelled through the outlet approach 157 . At this time, part of the air to be compressed reaches column 160 of sealing surfaces 158 , 159 , as shown by arrow 164 . In the known pump, the intake air reaches a deep area, as indicated by the dashed arrow 165 ge. In contrast, in this exemplary embodiment it is possible to prevent air from escaping to the low-pressure side, since this is prevented by the projections 162 , 163 . Accordingly, it is possible to prevent the air pressure from dropping and noticeably improve the performance of the vortex pump.

Fig. 14 is a cross-sectional view of the vortex pump with a modified sealing device. Fig. 15 is an enlarged partial view of Fig. 14. In this sealing device, two annular grooves 174 , 175 are formed in egg ner sealing surface 171 of the housing 170 and a sealing surface 173 of the housing 172 . An inlet lug 178 and an outlet lug 179 are attached to the housing 172 . The impeller 128 , unlike the previous embodiment, has no jumps before. Two ring-shaped sealing members 176 made of resin or the like are inserted into the ring grooves 174 , 175 in the respective sealing surfaces 171 , 173 of the housings 170 and 172 . Furthermore, two elastic parts 177, for example made of rubber, are inserted into the ring grooves 174 , 175 in order to press the respective sealing members 176 against the corresponding side surface of the impeller 128 , so that the sealing members 176 maintain their sealing function, even if they wear out slowly.

Fig. 16 shows a partial cross-sectional view of a modified sealing device, which represents the housing-side sealing area. Fig. 17 contains a schematic top view of a vortex pump using this sealing device. In this case, an annular groove 183 is formed in a sealing surface 182 of the housing 181 . An annular sealing member 184 made of resin or the like is inserted into the annular groove 183 . Compressed air serves to press the sealing member 184 against the side face of the impeller 188 ; that is, a pressure introduction hole 185 , which is connected to a wind tunnel 186 , is formed on the air under high pressure outlet boss 179 is formed . This high pressure air is led from the pressure introduction hole 185 via the sealing member 184 , as indicated by an arrow 187 in FIG. 16. This high pressure air presses the sealing member 184 against the side surface of the impeller 188 . Accordingly, it is possible to normally obtain a stable sealing pressure when the pump is in operation without the need for the elastic member 177 . Only the sealing area on the motor side is shown and described; the same applies to the area on the opposite side.

Fig. 18 is a partial cross-sectional view of yet another modified sealing device, showing the housing-side sealing area. Fig. 19 includes a schematic plan view of a vortex pump, which uses this sealing device. In this case, as in the sealing device described above, an annular groove 192 is formed in a sealing surface 191 of the motor-side housing 190 . The annular sealing member 184 made of resin or the like is inserted into the ring groove 192 . In order to press the sealing member 184 against the side surface of the impeller 128 , a pressure introduction hole 194 connected to a wind tunnel 193 is cut out in the middle between the high-pressure outlet attachment 179 and the inlet attachment 178 , as shown in FIG. 18. The sealing member 184 is pressed against the impeller 128 because compressed air acts on the sealing member 184 from the pressure introduction hole 194 , as indicated by an arrow 195 . Only the sealing area on the motor side is shown and described; the same applies to the area on the opposite side.

In operation, the air sucked in through the inlet shoulder 178 is gradually compressed by the cut-out grooves 130 of the impeller 128 . When the compressed air reaches a predetermined pressure, it is expelled through the outlet boss 179 . At this time, part of the air enters the gap 160 of the sealing area as indicated by the arrow 164 ( Fig. 13), but it is possible to prevent the leakage of air to the low pressure side through the sealing members 176 , 184 , act on the elastic part 177 and the compressed air introduced through the pressure introduction holes 185 , 194 . Accordingly, a decrease in air pressure can be prevented.

Example 8

Fig. 20 shows a typical impeller 128 of the vortex pump. Cut-out grooves 130 are formed in opposing areas along the entire periphery of the impeller 128 . The impeller 128 is covered by a housing and secured against the escape of air. The housing has wind tunnels on the grooves 130 of the impeller 128 corresponding positions.

Fig. 21 shows an improved impeller for a vortex pump according to the eighth game Ausführungsbei.

As shown in Fig. 21, blades 128 a are arranged along the peripheral surface of the impeller 128 at uneven intervals. The distance between the wings gradually increases and decreases along the circumference in two cycles. With this unequal Anord voltage, it is possible to fan out the noise frequencies more due to the wings, so that a single frequency noise is avoided, which is uncomfortable for the ear.

The number of cycles along the circumference is not according to the illustrated embodiment limited and can be larger than two. Alternatively the wings can be arranged in staggered intervals be nice.

This arrangement with unequal distances can each of the previous embodiments be applied.

Claims (13)

1. Vortex pump, characterized by

• a) an engine housing in which an engine is arranged and which has an intake opening through which outside air is taken in,
• b) a pump housing in which an impeller driven by the motor is rotatably arranged and which has an outlet opening through which compressed air is expelled,
• c) wherein at least a part of the motor housing forms an inner channel through which an inlet air flows and in which at least part of the motor is exposed.

2. Vortex pump according to claim 1, characterized records that the motor is a brushless motor is and that the intake opening in the motor housing on one side to the rear end of the main Lichen parallel to the air flow motor shaft is arranged. 3. Vortex pump according to claim 2, characterized records that an inlet duct is provided, through the outside air to the intake opening is feasible and in which a resonance silencer fer is arranged. 4. vortex pump according to claim 2, characterized records that an inlet duct is provided, through the outside air to the intake opening  is feasible and in which an absorption sound damper is arranged. 5. vortex pump according to claim 1, characterized shows that the motor is a brush motor, its brush in the flow channel the inlet is exposed to air. 6. vortex pump according to claim 5, characterized records that an inlet duct, through the outside air can be introduced to the suction opening, and an exhaust duct through which compressed air from the outlet flows, are provided, and that the inlet channel and / or the outlet channel that Cover the motor housing. 7. vortex pump according to claim 6, characterized shows that an absorption Muffler is arranged. 8. vortex pump according to claim 6, characterized shows that a resonance Muffler is arranged. 9. vortex pump according to one of claims 1 to 8, characterized in that the impeller wing has arranged in staggered intervals are not. 10. Vortex pump, characterized by

• a) an engine,
• b) a pump housing,
• c) a motor-driven, rotatably arranged impeller in the pump housing, and
• d) a device for sealing sealing surfaces of the impeller and the pump housing.

11. vortex pump according to claim 10, characterized records that the sealing device on a Circular line around the axis of rotation of the impeller is ordered and a groove either in the impeller or in the pump housing and an elevation each because on the other of these parts for one Engagement with the groove with a predetermined Has gap. 12. Vortex pump according to claim 10, characterized records that the sealing device on a Circular line around the axis of rotation of the impeller is ordered and a groove in the pump housing as well an annular seal inserted into the groove member and that it has a pressure introduction area containing the groove with a The pump's wind tunnel connects. 13. Vortex pump, characterized by an engine, a pump housing, one driven by the motor, rotatable in the pump chamber arranged impeller, and a sealing device in a circular line is arranged about the axis of rotation of the impeller and an annular groove in the pump housing as well an annular seal inserted into the groove member, the groove partially a Pressure introduction area that forms with a Wind tunnel of the pump is connected.