JPH05180189A - Scroll pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a structure of a vortex pump capable of greatly improving performance without increasing cost due to improvement in accuracy of parts and assembly. [Structure] Ring-shaped recesses or projections are provided on the seal surfaces 58 and 59 of the pump housing 52 and the casing 53, and projections or recesses are formed on the side surfaces of the impeller 50 with which a slight gap is engaged. Further, a ring-shaped groove is provided on the sealing surfaces of the housing and the casing, and a ring-shaped sealing member is inserted so as to contact the side surface of the impeller 50 with the elastic body sandwiched in the groove. .. Further, a ring-shaped groove is provided on the sealing surfaces of the housing and the casing to insert a seal member, and a pressure introduction hole communicating with the air passage is provided in at least a part of this groove. [Effect] The convex portion and the seal member prevented the high pressure air from escaping to the low pressure side, thereby improving the efficiency of the pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a vortex type pump for preventing air leakage from a slight gap between a housing or a casing and an impeller.

[0002]

2. Description of the Related Art Whirlpool pumps have been used for various purposes, but in recent years, they have come to be widely used for secondary air supply devices of internal combustion engines, etc. for cleaning exhaust gas of automobiles. It was Hereinafter, the present invention will be described by taking a vortex flow pump used in a secondary air supply device for an internal combustion engine of an automobile as an example, but the present invention is not limited to this secondary air supply device. Automobiles have been legally obliged to reduce HC and CO in exhaust gas. HC and CO
The lower the exhaust gas temperature, the more difficult the purification function of.
Therefore, the purification capacity can be improved by introducing an appropriate amount of air. Therefore, various improvements have been made to the secondary air supply device to improve the purification capacity. In particular, it has been found that a great effect can be obtained by using a swirl pump for the secondary air supply device.

A secondary air supply device for an internal combustion engine of an automobile will be described in detail below with reference to the drawings. FIG. 9 is a system diagram of a commonly used improved secondary air supply device. The air discharged from the air cleaner 2 is gradually released from the air flow sensor 6 by a throttle body 7 that gradually releases the air flow.
And enters the surge tank 8 which regulates the flow of air.
Then, the internal combustion engine body 10 is passed through the intake manifold 9.
Is inhaled. The exhaust gas that has driven the internal combustion engine body 10 is exhausted from the exhaust muffler 11 through the exhaust manifold 4 and the two catalytic converters 3. On the other hand, the secondary cleaner 1 is connected to the air cleaner 2. An electric pump 13 having a motor 18 directly connected to the secondary air introduction pipe 1.
The check valve 15 and the distribution valve 16 are connected to each other.
One of the distribution valves 16 is connected to the exhaust manifold 4, and the other is connected to the catalytic converter 3 on the exhaust muffler 11 side. The motor 18 is driven by a command signal from the computer 12 that processes the data from the detection device 17, and the drive unit 14 including the battery 19 is connected to the motor 18.

The operation will be briefly described. The air sent from the air cleaner 2 is sent to the internal combustion engine body 10, and the exhaust gas is sent to the exhaust manifold 4. On the other hand, the drive of the electric pump 13 is controlled by the command signal of the computer 12 which calculates the exhaust gas temperature, the pump pressure, the water temperature, the rotation speed, the boost pressure, etc. detected by the detection device 17, and the air cleaner 2
The new air is discharged from the electric pump 13 at an appropriate flow rate. This air is supplied to the plurality of catalytic converters 3 via the exhaust manifold 4 or directly to improve the function of the catalytic converters 3.

By the way, conventionally, an eddy-current type pump as shown in FIG. 10 has been used as the electric pump 13 including the motor 18. FIG. 10 is a sectional view of a conventional vortex flow pump, and FIG. 11 is a perspective view of an impeller. First, the structure of the motor unit is as follows. The main body of the motor 18 is housed in a case 20. An output shaft 23 is provided at both ends of an iron core 21, which is the center of the rotating body of the motor 18.
The output shaft 23 includes a bearing 22 fixed to the case 20 and a bearing 22 fixed to a housing described later.
Is supported by and. An armature coil 24 is formed around the iron core 21, and a field coil 25 is further wound around the armature coil 24. A commutator 26 is provided between the iron core 21 and the one output shaft 23. This commutator 26
A brush 27 is formed around the.

The structure of the pump unit is as follows. An impeller 28 is fixed to an output shaft 23 of the motor 18 by a nut 29. The outer circumference of the impeller 28 is shown in FIG.
The cutout groove 30 as shown in FIG. 2 is formed on both sides when viewed in cross section. The impeller 28 is covered with a housing 31 provided on the motor side and a casing 32 on the opposite side, and prevents escape of air. The aforementioned bearing 22 is fixed to the housing 31, and the impeller 2
An air passage 33 is formed at a position corresponding to the cutout groove 30 of FIG. Further, in the casing 32, an intake nipple 34 for sucking the air from the air cleaner 2 in the direction of arrow 37, an exhaust nipple 35 for discharging the air pressurized by the impeller in the direction of arrow 38, and an impeller 28.
An air passage 36 is formed at a position corresponding to the cutout groove 30 of FIG. It should be noted that a slight gap 4 for rotating the impeller 28 is provided between the side surface of the impeller 28 and the seal surfaces 39 and 40 which are the inner surfaces of the housing 31 and the casing 32.
1 is formed.

The operation will be described. The motor 18 has a well-known function in relation to the armature coil 24, the field coil 25 and the iron core 21, and the commutator 26 and the brush 27.
1 rotates. As a result, the output shaft 2 integrated with the iron core 21
3 rotates, and the impeller 28 fixed by the nut 29 is rotated. At this time, the air sucked from the suction nipple 34 enters the notch groove 30 of the impeller 28, rotates together, is gradually made to have a high pressure, and is discharged from the exhaust nipple 35. Then, it is supplied from the distribution valve 16 to the plurality of catalytic converters 3. For this reason, new high-pressure air is sent to the catalytic converter 3, so that the catalytic converter 3 burns HC and CO better, reduces HC and CO, and discharges them from the exhaust muffler 11. Therefore, the electric pump 13
Acts to improve the function of the catalytic converter 3.

[0008]

The vortex pump has the above-mentioned effects, but since the structure of the conventional vortex pump is constructed as described above, the impeller 28 is used.
The clearance 41, which is the side clearance between the impeller 28 and the seal portions 39 and 40 of the housing 31 and the casing 32, has a great influence on the performance of the vortex pump. The narrower the gap 41, the better the performance. However, in order to narrow the gap 41, very strict control of component accuracy and assembly accuracy are required. Therefore, narrowing the gap 41 causes a great decrease in productivity, which in turn increases the cost.

The present invention has been made to solve the above-mentioned problems, and the performance can be greatly improved even with the conventional clearance system without increasing the cost due to the increase in the accuracy of parts and assembly. It is an object of the present invention to provide a structure of a swirl type pump that can be used.

[0010]

A vortex type pump according to a first aspect of the present invention relates to a motor, an impeller rotated by the motor, a housing for accommodating the impeller, and a suction which covers the housing. It is composed of a casing in which a nipple and an exhaust nipple are formed, and a ring-shaped concave portion or convex portion is provided on the sealing surface of the housing and the casing, and the concave portion or convex portion is formed on the side surface of the impeller. It is formed with a convex portion or a concave portion that engages with a slight gap.

A vortex pump according to a second aspect of the present invention comprises a motor, an impeller, a housing, and a casing in which an intake nipple and an exhaust nipple are formed, and a sealing surface between the housing and the casing. In addition to providing a ring-shaped groove in the groove, an elastic body such as rubber is sandwiched in the groove so that it contacts the side surface of the impeller.
A ring-shaped sealing member made of resin or the like is inserted.

A vortex flow pump according to a third aspect of the present invention comprises a motor, an impeller, a housing, and a casing in which an intake nipple and an exhaust nipple are formed, and a sealing surface between the housing and the casing. A ring-shaped groove is provided in the ring-shaped groove, a pressure introduction hole communicating with the air passage is provided in at least a part of the ring-shaped groove, and a ring-shaped seal member made of resin or the like is inserted into the groove. Is to have.

[0013]

The vortex flow pump according to the first aspect of the present invention has the same effect as that of narrowing the gap of the sealing surface by blocking the escape of air by the convex portion formed on the housing, the casing or the impeller. To raise.

Further, in the vortex flow pump according to the second aspect of the present invention, the elastic body in the ring-shaped groove and the seal member block the escape of the air passing through the seal surface to narrow the gap between the seal surfaces. It is designed to have the same effect as it did.

Further, in the swirl pump according to a third aspect of the present invention, the air having a high pressure generated by the rotation of the impeller is blown from the pressure introducing hole onto the seal member to press the seal member against the side surface of the impeller to escape the air. It has the same effect as closing the gap and narrowing the gap between the sealing surfaces.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The swirl pump described in this embodiment can be used in place of the electric pump 13 in FIG. FIG. 1 is a sectional view of an essential part of a vortex flow pump showing a first embodiment of the present invention.
FIG. 2 is a partial sectional view of the seal portion. The same elements as those in FIGS. 9 and 10 are designated by the same reference numerals and the description thereof will be omitted. On the output shaft 23 of the motor, an impeller 50 having a notch groove 51 for rotating the sucked air around the outer periphery thereof is fixed by a nut 29. The impeller 50 is covered with a housing 52 and a casing 53 to prevent escape of air. An air passage 54 on the housing 52 side and an air passage 55 on the casing 53 side are provided at positions corresponding to the cutout grooves 51 of the impeller 50. The casing 53 is formed with an intake nipple 56 for sucking air from the air cleaner 2 and an exhaust nipple 57 for discharging high-pressure air. In addition, on the side surfaces of the impeller 50 and the seal surfaces 58 and 59 which are the inner surfaces of the housing 52 and the casing 53,
A slight gap 60 is formed.

The above construction is almost the same as the conventional construction, but in the present invention, the sealing surfaces 58 and 59 are devised. That is, as shown in FIG. 2, a concave portion 61 is provided on the side surface of the impeller 50. The seal portion 58 of the housing 52 is provided with a convex portion 62 that engages with the gap 60 with a slight gap at a position corresponding to the concave portion 61 of the impeller 50. Similarly, the sealing surface 5 of the casing 53
9 has a gap 6 at a position corresponding to the recess 61 of the impeller 50.
The convex portion 63 having a height larger than the width of 0 is formed.
The relationship between the concave portion and the convex portion is not limited to the above-mentioned embodiment, and various combinations such as forming the concave portion on the housing or casing and forming the convex portion on the impeller are possible.

This operation will be described with reference to the drawings. The air sucked from the suction nipple 56 enters the notch groove 51 of the impeller 50, rotates together, and is gradually increased in pressure to be discharged from the exhaust nipple 57. At this time, a part of the air to be pressurized has a sealing surface 58, as shown by an arrow 64.
The gap 59 enters in the direction of the gap 60. In the prior art, this air that has entered has entered into the interior as shown by the dotted arrow 65, but in the present embodiment, it is blocked by the convex portions 62 and 63 to prevent the escape of air toward the low pressure side. You can Therefore, it became possible to prevent the decrease of the air pressure, and it was possible to greatly improve the performance of the vortex flow pump.

FIG. 3 is a sectional view of a main portion of a vortex flow pump showing a second embodiment of the present invention, and FIG. 4 is a partial sectional view of a seal portion. In this embodiment, the sealing surface 71 of the housing 70 is
And the sealing surface 73 of the casing 72 are provided with ring-shaped grooves 74 and 75, respectively. A suction nipple 78 and an exhaust nipple 79 are of course formed in the casing 72. As the impeller 28, the same impeller as the conventional one shown in FIG. 10 is used. Then, the ring-shaped groove 7 formed in the sealing surfaces 71 and 73 of the housing 70 and the casing 72.
A ring-shaped seal member 76 made of resin or the like is inserted in each of 4 and 75. Further, an elastic body 77 such as rubber is sandwiched between the ring-shaped grooves 74 and 75 so that the seal member 76 is brought into contact with the side surface of the impeller 28.
The elastic member 77 may be brought into contact with the impeller 28 only by contacting only the seal member 76. However, when the seal member 76 is gradually worn, the role of the seal is reduced by half, and therefore the elastic member 77 is halved. It is for pressing with 77.

FIG. 5 is a partial sectional view of a seal portion on the housing side showing a third embodiment of the present invention, and FIG. 6 is a schematic plan view of a vortex flow pump. This embodiment is an improved example of the second embodiment. A ring-shaped groove 83 is provided on the sealing surface 82 of the housing 81. A ring-shaped sealing member 84 made of resin or the like is inserted into the ring-shaped groove 83 formed in the sealing surface 82 of the housing 81. Then, high-pressure air is used to bring the seal member 84 into contact with the side surface of the impeller 28. That is, the pressure introducing hole 85 communicating with the air passage 86 is provided at the exhaust nipple 79 containing high-pressure air. High pressure air is sent from the pressure introducing hole 85 to above the seal member 84 as indicated by an arrow 87 in FIG. The seal member 84 is pressed against the side surface of the impeller 28 by this high-pressure air. Therefore, according to this embodiment, it is not necessary to use the elastic body 77 of the second embodiment, and it is possible to always provide a stable sealing pressure in the operating state of the pump. Although only the housing side is described in the drawing, the same applies to the casing side.

FIG. 7 is a partial sectional view of a seal portion on the housing side showing a fourth embodiment of the present invention, and FIG. 8 is a schematic plan view of an eddy current pump. This embodiment is an improved example of the third embodiment. The ring-shaped groove 9 is formed on the sealing surface 91 of the housing 90.
2 is provided, and a ring-shaped seal member 84 made of resin or the like is inserted into the ring-shaped groove 92.
Then, in order to bring the seal member 84 into contact with the side surface of the impeller 28, a notch as shown in FIG. 7 that communicates with the air passage 93 is provided between the exhaust nipple 79 and the suction nipple 78 that have high-pressure air. The pressure introducing hole 94 is provided. By feeding high-pressure air from the pressure introducing hole 94 to the seal member 84 as indicated by an arrow 95, the seal member 84
Is pressed against the side surface of the impeller 28. Although only the housing side is described in this figure, the same applies to the casing side.

The operation of the second to fourth embodiments will be briefly described. The air sucked from the suction nipple 78 is gradually increased in pressure in the notch groove 30 of the impeller 28,
When the pressure becomes constant, the gas is discharged from the exhaust nipple 79. At this time, a part of the air has a gap 60 in the seal portion as indicated by an arrow 64.
2 (see FIG. 2), but in this embodiment, the elastic body 7
It is possible to prevent the air from escaping to the low pressure side by being blocked by the seal members 76 and 84 in the concave portion which are pressed by the high pressure air guided from the pressure introducing holes 85 and 94. Therefore, it became possible to prevent the decrease of the air pressure.

[0023]

As described above, according to the present invention, claim 1
Since the convex portion prevents the high-pressure air from escaping to the low-pressure side, and the sealing member in claims 2 and 3, it is possible to prevent the efficiency of the pump from decreasing and prevent the efficiency from decreasing. Since it does not require high-precision part processing or assembly precision control, the cost is not increased, and the great effect that the vortex flow pump can be provided with a very simple structure can be achieved.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a vortex flow pump showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the seal portion of FIG.

FIG. 3 is a sectional view of an essential part of a vortex flow pump showing a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of the seal portion of FIG.

FIG. 5 is a partial cross-sectional view of a seal portion on the housing side showing a third embodiment of the present invention.

FIG. 6 is a schematic plan view of the vortex pump shown in FIG.

FIG. 7 is a partial cross-sectional view of a seal portion on the housing side showing a fourth embodiment of the present invention.

FIG. 8 is a schematic plan view of the vortex pump shown in FIG.

FIG. 9 is a system diagram of a commonly used improved secondary air supply device.

FIG. 10 is a sectional view of a conventional vortex pump.

FIG. 11 is a perspective view of a conventional impeller.

[Explanation of symbols]

 28, 50 Impeller 51 Notch groove 52, 70, 81, 90 Housing 53, 72 Casing 54, 55, 86, 93 Air passage 56, 78 Intake nipple 57, 79 Exhaust nipple 58, 59, 71, 73, 82, 91 sealing surface 60 gap 61 concave portion 62, 63 convex portion 74, 75, 83, 92 ring-shaped groove 76, 84 sealing member 77 elastic body 85, 94 pressure introducing hole

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[Procedure amendment]

[Submission date] January 16, 1992

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Claims (3)

[Claims] 1. A vortex pump comprising a motor, an impeller rotated by the motor, a housing for accommodating the impeller, and a casing which covers the housing and has an intake nipple and an exhaust nipple. A ring-shaped concave portion or convex portion is provided on the sealing surface of the housing and the casing, and a convex portion or concave portion that engages with the concave portion or convex portion with a slight gap is provided on a side surface of the impeller. Eddy current type pump characterized by. 2. A vortex flow pump comprising a motor, an impeller rotated by the motor, a housing for accommodating the impeller, and a casing that covers the housing and has an intake nipple and an exhaust nipple. A ring made of resin or the like, which is provided with a ring-shaped groove on the sealing surface of the housing and the casing, and in which an elastic body such as rubber is sandwiched in the groove so as to abut the side surface of the impeller. A vortex flow pump having a seal member inserted therein. 3. A vortex pump comprising a motor, an impeller rotated by the motor, a housing for accommodating the impeller, and a casing that covers the housing and has an intake nipple and an exhaust nipple. A ring-shaped groove is provided on the sealing surface of the housing and the casing, a pressure introducing hole communicating with the air passage is provided in at least a part of the ring-shaped groove, and a ring made of resin or the like is provided in the groove. A vortex flow pump, characterized in that a seal member having a circular shape is inserted, and the seal member is brought into contact with a side surface of the impeller by air from the pressure introducing hole.