JP2002371992A - Fluid pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of an air pump (blower) while preventing an offset between the shaft center of an impeller and the shaft center of a motor (motor shaft). SOLUTION: A motor casing part 228 and a pump casing part 229 are integrated, and in an integral casing 230 thus integrated, a bearing 236 arranged on the side of the impeller 221 is fixedly positioned in a state inserted in a bore portion 238 formed in the integral casing 230. Dimensional accuracy of the bore portion 238 and assembly accuracy of the bearing 236, if set to specified or stricter values, can produce necessary shaft center accuracy. The manufacturing cost of the air pump (blower) 220 can be thus reduced while the necessary shaft center accuracy is ensured, by virtue of the absence of necessity for strict control on dimensional accuracy of component parts of a pump and component parts of the motor, assembly accuracy of the pump and assembly accuracy of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump unit having an impeller for sucking and discharging a fluid, and a fluid pump in which an electric motor unit for rotating and driving the impeller is integrated. It is effective when applied to an air pump (blower) for a heater (combustor).

[0002]

2. Description of the Related Art A general structure of an air pump (blower) for a combustion type heater (combustor) is a pump in which an impeller is housed, and an electric motor (hereinafter abbreviated as a motor) driven by the impeller. It is to be assembled.

[0003]

The rotor in the motor is mounted on the motor casing via a bearing. However, if the mounting precision of the bearing on the motor casing is low, the rotor may run around. Therefore, it is necessary to assemble the bearing with high precision to the motor casing.

However, if the accuracy of assembling the motor (motor casing) to the pump casing is low, the axis of the impeller and the axis of the motor (motor shaft) are displaced. Even in the case of assembling, there is a possibility that the rotor may whirling.

On the other hand, it is necessary to strictly control the dimensional accuracy of the components of the pump and the components of the motor, as well as the accuracy of the assembly of the pump and the accuracy of the assembly of the motor. This leads to higher costs.

SUMMARY OF THE INVENTION In view of the foregoing, an object of the present invention is to reduce the manufacturing cost of an air pump (blower) while preventing the shaft center of an impeller from being displaced from the shaft center of a motor (motor shaft). And

[0007]

In order to achieve the above object, according to the present invention, a pump section (P) having an impeller (221) for sucking and discharging a fluid is provided.
o), and a motor pump unit (22) which is an integrated fluid pump in which an electric motor unit for rotatingly driving the impeller (221) is housed, and which accommodates a rotor (224) of the electric motor unit.
8) and a pump casing part (229) that houses the impeller (221).
0) and the rotor (22)
4) a bearing (236) for rotatably supporting the shaft (227), and the integral casing (230) includes:
A fixing portion (238) for fixing the bearing (236) is provided.

Accordingly, if the dimensional accuracy of the fixing portion (238) and the assembling accuracy of the bearing (236) are equal to or larger than the specified values, required shaft center accuracy can be obtained. Therefore, there is no need to strictly control the dimensional accuracy of the components of the pump and the components of the motor, as well as the accuracy of assembling the pump and the motor, thereby reducing the manufacturing cost of the fluid pump while ensuring the necessary shaft center accuracy. Can be achieved.

According to the second aspect of the present invention, the rotor (224) is provided on the side of the integral casing (230) opposite to the impeller (221) side in a direction parallel to the longitudinal direction of the shaft (227). In the case where an opening (232) for insertion into the integral casing (230) is formed, and the opening (232) is closed by the lid member (233), the fixing portion is fixed to the lid member (233). (23
8) formed to have a predetermined coaxiality with respect to
It is desirable to provide a support (239) for supporting the shaft (227).

Further, as in the third aspect of the present invention, the support portion (239) may rotatably support the shaft (227) via a bearing (237).

It is desirable that the coaxiality be IT3 to IT4 as in the fourth aspect of the present invention.

Further, as in the invention according to claim 5,
It is desirable to provide a sealing means (235) for hermetically sealing the opening (232) on the opening (232) side.

According to the invention described in claim 6, the pump section (P) having the impeller (221) for sucking and discharging the fluid.
o) and a motor pump unit (22) that is a fluid pump in which an electric motor unit that rotationally drives the impeller (221) is integrated, and that accommodates a rotor (224) of the electric motor unit.
8) and a pump casing part (229) that houses the impeller (221).
0) and the rotor (22)
4) a bearing (236) for rotatably supporting the shaft (227), and the integral casing (230) includes:
A bearing portion (2) that contacts the shaft (227) of the rotor (224) and rotatably supports the shaft (227) for adjustment.
36a) is provided.

[0014] This eliminates the need to strictly control the dimensional accuracy of the components of the pump and the components of the motor, and the accuracy of assembling the pump and the motor. Manufacturing cost can be reduced.

According to the seventh aspect of the present invention, the pump section (P) having the impeller (221) for sucking and discharging the fluid.
o) and an electric motor (Mo) for rotatingly driving the impeller (221), which is a fluid pump integrated with the motor casing (228) for housing the electric motor (Mo).
And an integral casing (230) in which a pump casing (229) for housing the impeller (221) is integrated.
And a suction port (Pos), a discharge port (Pod), and a nose section (Pon) of the pump section (Po) are provided in an inner casing (230c) formed separately from the integral casing (230). It is characterized by having.

Thus, the inner casing (230)
Since machining (finishing) such as cutting may be performed only on c), a portion where machining (finishing) such as cutting can be performed can be reduced. Therefore, the manufacturing cost of the fluid pump can be reduced while preventing the pump performance from being significantly reduced.

Further, by changing the shape of the inner casing (230c) without changing the entire integral casing (230), optimization of the suction port (Pos), the discharge port (Pod) and the nose (Pon) is achieved. The suction port (Pos) and the discharge port (Pod)
Of the fluid flow upstream of the suction port (Pos) and downstream of the fluid flow from the discharge port (Pod) can be easily increased without being affected by the shape. Therefore, it is possible to easily manufacture the fluid pump while keeping the suction resistance and the discharge resistance low.

According to the eighth aspect of the present invention, the integral casing (230) and the inner casing (230)
It is desirable that c) is fastened by mechanical fastening means (B1, B2 to B4).

According to the ninth aspect of the present invention, the pump section (P) having the impeller (221) for sucking and discharging the fluid.
o) and an electric motor (Mo) for rotatingly driving the impeller (221), wherein the electric motor (Mo) has one of its axial ends at an integral casing (230). The motor casing (228), which is fixed and further houses the electric motor (Mo),
It is characterized in that it is formed so as to cover the outside of the electric motor (Mo).

In the case where the electric motor (Mo) has a cantilever support structure in which only one end in the axial direction is fixed to the integral casing (230), the motor casing (22)
If the rigidity of 8) is low, the impeller (221) and the electric motor (Mo) may resonate greatly and vibrate to increase the vibration magnification.

On the other hand, in the present invention, since the motor casing (228) is formed so as to cover the outside of the electric motor (Mo (), the motor casing (22)
8) can be increased in rigidity, and it is possible to prevent the impeller (221) and the electric motor (Mo) from resonating greatly and vibrating to increase the vibration magnification.

According to the tenth aspect of the present invention, the inner casing (230) having the suction port (Pos), the discharge port (Pod) and the nose section (Pon) of the pump section (Po).
c) is provided separately from the integral casing (230), and the electric motor (Mo) is connected to the inner casing (230c).
Characterized by being fixed to the integral casing (230) via

Thus, the components constituting the fluid pump, such as the electric motor (Mo) and the impeller (221), can be inserted and assembled into the integral casing (230) from one direction. Performance can be improved.

The eleventh aspect of the present invention is characterized in that the other end of the electric motor (Mo) in the axial direction is pressed toward one end in the axial direction by the elastic force of the elastic means (235b). .

As a result, the manufacturing variation of the integral casing (230), the electric motor (Mo), and the impeller (22)
It is possible to absorb the vibration in the axial direction while absorbing the variation in assembling the components constituting the fluid pump such as 1).
Therefore, the vibration resistance can be improved while improving the workability of assembling.

According to the twelfth aspect, at least one of the suction port (Pos) and the discharge port (Pod) provided in the inner casing (230c) is provided with respect to the rotation shaft of the impeller (221). A guide portion (230h) for guiding a fluid in a predetermined direction while being inclined with respect to an orthogonal reference plane is provided.

Thus, interference noise and noise of the air (fluid) flowing through the suction port (Pos) and the discharge port (Pod) can be reduced.

According to a thirteenth aspect of the present invention,
The inner casing (23) is attached to the integral casing (230).
0c) is formed with a hole (230d) into which the inner casing (23d) is inserted and mounted.
The inner casing (230c) may be positioned with respect to the integral casing (230) by contacting the outer wall of 0c).

According to the invention of claim 14,
When applying the fluid pump (220) according to any one of claims 1 to 5 to a combustor, the fluid pump (22) is used.
0) into the integral casing (230) of the fluid pump (22).
It is desirable to provide an air passage (231) for supplying the air discharged from 0) to the combustion section (210).

Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)
FIG. 1 is a schematic diagram of a vehicle heating apparatus using a combustion heater, in which a fluid pump according to the present invention is applied to an air pump for a combustion heater, and 10 is a water-cooled engine (vehicle running). Reference numeral 11 denotes an exhaust pipe that collects exhaust gas discharged from each cylinder of a water-cooled engine (hereinafter, abbreviated as engine) and guides the exhaust gas to a catalyst 12 described later.

Reference numeral 12 denotes a three-way catalyst (hereinafter abbreviated as a catalyst) for purifying the exhaust gas by promoting an oxidation-reduction reaction such as hydrocarbon or nitrogen oxidation in the exhaust gas. Is provided with a muffler (muffler) 13 for reducing noise (exhaust sound) of exhaust gas flowing out of the catalyst 12.

A radiator 14 cools cooling water (coolant) circulating in the engine 10, and a water pump 15 circulates cooling water by obtaining driving force from the engine 10. Reference numeral 16 denotes a bypass passage for returning the cooling water flowing out of the engine 10 to the engine 10 by bypassing the radiator 14, and 17 for flowing the cooling water flowing out of the engine 10 to the radiator 14 according to the cooling water temperature. , A well-known thermostat that switches between a case in which the gas flows through the bypass passage 16. Incidentally, the water pump 15 and the bypass passage 16 are usually built in the engine 10.

Reference numeral 20 denotes a heater core (heating heat exchanger) for heating the interior of the vehicle compartment by heating air blown into the vehicle interior using cooling water as a heat source.
This is a combustion-type heater that is disposed further upstream in the flow of the cooling water and heats the cooling water (hot water) flowing into the heater core 20.

Then, the combustion state of the combustion type heater 21 (stopped or calorific value of the combustion type heater 21), the combustion type heater 21
A fuel pump (F / P) 22 for pumping fuel to the pump and an electric water pump 23 for circulating cooling water through the combustion heater 21 and the heater core 20 are controlled by an electronic control unit (not shown). The fuel pump 22 sucks fuel from a fuel tank 25 in which liquid fuel of the engine 10 (in this embodiment, light oil) is stored, and supplies the fuel to the combustion heater 21.

A bypass passage 26 guides the cooling water flowing out of the engine 10 to the combustion type heater 21 by bypassing the electric water pump 23. The bypass passage 26 has a cooling water discharged from the electric water pump 23. Water flows through the bypass passage 26 and the electric water pump 23
A check valve 27 for preventing reflux is provided on the suction side of the pump.

As shown in FIG. 2, the combustion type heater 21 has an integrated blower (air pump) 220 for blowing combustion air to the combustion section 210.
1, 212 are external pipes through which cooling water flows (not shown).
Is a connection joint to be connected. Incidentally, 211 is an inflow side of the cooling water, and 212 is an outflow side of the cooling water.

Next, a blower (air pump) 220 according to this embodiment will be described.

FIG. 3 is an exploded perspective view of the blower 220.
FIG. 4 is a cross-sectional view of the blower 220. Then, in the blower 220 according to the present embodiment, as shown in FIG. 4, the air (fluid) flows along the arc-shaped bottom of the blade groove 221 a due to the centrifugal force caused by the rotation of the resin impeller (impeller) 221. A vortex-type (Wesco-type) pump unit Po for sending out air (fluid) by utilizing the flow from the inner diameter side to the outer diameter side of the 221, and an electric motor (in this embodiment, DC (Motor) Mo.

Here, the electric motor Mo (hereinafter referred to as motor M)
Abbreviated as o. ) Is a cylindrical sleeve (yoke) 222 made of a magnetic material such as iron, a pair of permanent magnets (magnets) 223 bonded to the inner wall of the sleeve 222, and a lamination core (laminated) made of a magnetic material such as iron. (Armature) 2 with a conductor (winding) wound around a mold core)
24, and a power supply unit composed of a brush 226 that slides and contacts a commutator (commutator, throttle) 225 that rotates integrally with the rotor 224. 221 press-fitted and fixed to the rotor shaft 227 by the rotation of
Rotates.

Incidentally, the sleeve 222 constitutes a magnetic circuit of a magnetic field induced by the permanent magnet.
As is well known, the power supply unit including the commutator 225 and the brush 226 switches the polarity of the rotor 224 and
4 is continuously rotated. 226a is a wiring for supplying a current to the brush 226, and 226b is a circuit board to which the wiring 226a is electrically connected.

The rotor 224 and the sleeve 22
The motor casing 228 that houses the components of the motor Mo such as the motor casing 2 and the pump casing 229 that houses the impeller 221 are integrated with a heat-resistant metal (in the present embodiment, aluminum) to form an integral casing 2.
30, and the integral casing 230 includes:
An air passage 231 for supplying air discharged from the pump Po (pump casing 229) to the combustion unit 210 is formed.

An opening 2 for inserting the rotor 224 into the integral casing 230 (motor casing section 228) is provided on the side of the integral casing 230 opposite to the impeller 221 in the longitudinal direction of the rotor shaft 227.
In the opening 232, a motor cap (lid member) 233 made of the same material as that of the integral casing 230 is fitted into the opening 232 (integral casing 230) at about IT3 to IT4 (see JISB 0401). It is obstructed by.

A metal bottom cover 234 is provided on the opposite side of the rotor 224 across the motor cap 233 (hereinafter, abbreviated as the cap 233) so as to cover the cap 233 from outside the motor casing 228. The bottom cover 234 has an opening 23 with a packing (seal means) 235 made of an elastically deformable material (rubber in this embodiment) interposed between the bottom cover 234 and the motor casing 228.
The motor casing 228 (integral casing 230) is fastened with a fastening member 236 such as a bolt in a state where
It is fastened and fixed.

The packing 235 has a cap 23
3. The cylindrical vibration isolator 235a that restricts the cap 233 from vibrating and displacing in the axial direction of the rotor 224 and in a direction orthogonal to the axial direction of the rotor 224 by being fitted into the stepped portion (projection) 233a formed in Are formed.

Incidentally, both ends of the rotor shaft 227 are provided with rolling bearings (hereinafter abbreviated as bearings) 236, 237.
Among the bearings 236 and 237, the bearing 236 disposed on the impeller 221 side is inserted into a hole (fixed portion) 238 formed in the integral casing 230 and positioned and fixed. I have.

On the other hand, among the bearings 236 and 237, the rotor 2
The bearing 237 disposed on the side opposite to the impeller 221 side with respect to the impeller 22 is inserted into a hole (supporting portion) 239 formed in the cap 233 and fixed in position. Incidentally, the bearing 237 side (lower side) of the rotor shaft 227 is supported by a thrust bearing (not shown).

At this time, if the center position (coaxiality) of the hole (supporting portion) 239 formed in the cap 233 is largely displaced from the hole (fixing portion) 238 formed in the integral casing 230, the rotor 222 In this embodiment, the opening 232 and the opening 232 formed in the integral casing 230 are adjusted so that the coaxiality of the hole (supporting portion) 239 with respect to the hole (fixing portion) 238 becomes IT3 to IT4. The roundness of the holes 238, 239 (in this embodiment, IT2
5), dimensional tolerances such as cylindricity (IT2 to 5 in this embodiment) and roughness of the mating surface (12.5z or less in this embodiment) are selected.

Numeral 240 denotes a wave washer (anti-rattle means) formed in a wave shape for preventing the rotor 224 from rattling in the axial direction by pressing the rotor 224 in the axial direction, and 241 covers the impeller 221 and , A pump cover for sealing the space in which the impeller 221 rotates.

Next, an outline of an assembling procedure of the blower 220 according to the present embodiment will be described in the order of the steps (see FIG. 3).

First, the rotor 224 (rotor shaft 22
In 7), the bearings 236 and 237 are press-fitted and fixed by an interference fit (bearing assembling step), and it is checked whether the whirling amount of the rotor 224 itself is equal to or less than a predetermined value (first).
Inspection process).

Next, with the wave washer 240 attached to the rotor shaft 227, the rotor 224 is attached to the integral casing 230 (motor casing portion 228) to which the sleeve 222 and the permanent magnet 223 are attached (adhered).
(Rotor insertion step).

Then, the cap 233 and the packing 235
And bottom cover 235 with bolts 236 to form integral casing 23
0 (motor casing part 228) and fixed (rotor fixing step), and thereafter, the permanent magnet 223 is magnetized by applying current to the windings of the rotor 222 (magnetizing step).

The impeller 221 and the pump cover 24
1 and the pump cover packing 242 may be assembled either before the magnetizing step or after the magnetizing step.

Next, the general operation of the blower 220 according to this embodiment will be described.

When the rotor 224 (winding) is energized, the rotor 224 and the rotor shaft 227 rotate, and the impeller 221 rotates. The air discharged by the rotation of the impeller 221 is blown (discharged) toward the combustion unit 210 via the air passage 231.

Next, the features (effects) of this embodiment will be described.

According to the present embodiment, the bearing 236 provided on the impeller 221 side is inserted into the hole (fixing portion) 238 formed in the integral casing 230 and is positioned and fixed. If the dimensional accuracy of the 238 and the mounting accuracy of the bearing 236 are set to the specified values or more, the necessary shaft center accuracy can be obtained. Therefore, the dimensional accuracy of the components of the pump and the components of the motor, and the mounting accuracy and Since it is not necessary to strictly control the assembling accuracy of the motor, it is possible to reduce the manufacturing cost of the air pump (blower) 220 while ensuring the necessary axial accuracy.

The packing 235 allows the opening 23 to be opened.
Since the rotor 224 can be prevented from vibrating while hermetically sealing 2, airtightness and a prevention function can be ensured without providing a sealing component and a vibration isolation component, respectively. Since the number of parts can be reduced, the manufacturing cost of the air pump (blower) 220 can be reduced.

(Second Embodiment) In the first embodiment, the bottom cover 234 is fixed to the integral casing 230 with bolts 236, but in this embodiment, as shown in FIG.
Is fixed to the integral casing 230 by press-fitting.

(Third Embodiment) In the first embodiment, the bottom cover 234 is fixed to the integral casing 230 with bolts 236, but in the present embodiment, as shown in FIG.
Is welded (welded) to the integral casing 230.

(Fourth Embodiment) In the first embodiment, the bottom cover 234 is fixed to the integral casing 230 with bolts 236. In this embodiment, the bottom cover 234 is made of resin and is shown in FIG. As shown in FIG.
4 is fixed to the integral casing 230.

In FIG. 7, a projection 234 a for locking is provided on the bottom cover 234, and the projection 2
The locking hole portion 230a into which the locking portion 34a is inserted is provided, but the present embodiment is not limited to this. Conversely, the locking projection portion 234a is provided on the integral casing 230, and the bottom portion is formed. The lid 234 may be provided with a locking hole 230a into which the projection 234a is inserted.

(Fifth Embodiment) In the first embodiment, the bottom lid 234 is fixed to the integral casing 230 with bolts 236. In the present embodiment, as shown in FIG. This is an example in which the bottom cover 234 is fixed to the integral casing 230 by caulking (plastic deformation).

In FIG. 8, the integral casing 230 is provided with the protruding portion 230b for caulking. However, the present embodiment is not limited to this.
4 may be provided with a projection for caulking.

(Sixth Embodiment) In the first embodiment, the bottom cover 234 is fixed to the integral casing 230 with the bolts 236. However, in the present embodiment, a component called the bottom cover 234 is fixed to the integral casing 230. Instead, as shown in FIG. 9, the packing 23 is filled by filling the resin so that the opening 232 is solidified (molded) with resin (rubber).
5 and the bottom cover are integrally formed.

Reference numeral 235a denotes a metal or resin sealing cap for closing a hole (supporting portion) 239 formed in the cap 233. The sealing cap 235a is fixed (molded) with a resin to be filled. ) Has been done.

(Seventh Embodiment) In the above embodiment, the rotor shaft 227 is rotatably supported via the bearing 236. However, in the present embodiment, as shown in FIG.
The bearing 237 is provided to support the rotor shaft 227 rotatably directly by the cap 233 without the bearing 237.

The portion of the cap 233 that comes into contact with the rotor shaft 227 (the bearing portion 236a) is highly likely to be worn by the rotation of the rotor shaft 227. It is desirable to increase hardness by surface treatment such as carburizing or nitriding.

Further, 240a is a wave washer 24.
By pressing 0, the wave washer 240 exerts a predetermined pressing force.

(Eighth Embodiment) In this embodiment, as shown in FIG. 11, when an axial load acts on the rotor shaft 227 such as when the impeller 221 is pressed into the rotor shaft 227 or the like, the rotor shaft 227 A shaft holding hole 233 b for holding the shaft is provided in the cap 233.

After the assembly of the impeller 221 is completed, the shaft holding hole 233b is airtightly closed by a rubber, resin or metal lid 233c.

(Ninth Embodiment) In the above embodiment, the permanent magnet 223 is adhered to the sleeve 222. However, in this embodiment, as shown in FIG. 222a is formed by cutting and raising a part of the sleeve 222, and a U-shaped leaf spring 222a is formed.
The permanent magnet 223 is fixed to the sleeve 222 by pressing the permanent magnet 223 toward the protrusion 222a at b.

(Tenth Embodiment) This embodiment is different from the embodiment shown in FIG.
As shown in (1), in the integrated casing 230, particularly, a portion near the suction port and the discharge port (nose portion) of the pump Po and close to the impeller 221 is separated. In the following, this separate unit is referred to as an inner casing 230c.

As shown in FIG. 14 (top view of FIG. 13), the suction port Pos and the discharge port Pod of the pump portion Po are arranged in the circumferential direction with a columnar rib Po1 separating them. The nose part Pon is formed in a fan shape so as to cover the discharge port Pod from the impeller 221 side.

The inner casing 230c has
As in the above-described embodiment, a hole 238 (see FIG. 13) for mounting the bearing 236 is provided, and the axial end of the motor Mo opposite to the impeller 221 is provided with a rubber It is fixed to the integral casing 230 via an anti-vibration material 235b made of an elastic member such as.

The motor Mo is fixed to the inner casing 230c in a state of being prevented from rotating by a plurality of screws (fastening means) B1.
Reference numeral 0c is fixed to the integral casing 230 by a plurality of screws (fastening means) B2 in a state where it is prevented from rotating.

At this time, the inner casing 230c
Is positioned with respect to the integral casing 230 by the outer wall of the inner casing 230c contacting the inner wall of the hole 230d (see FIG. 13) formed in the integral casing 230.

More specifically, positioning in the axial direction is performed by a surface 230e of the inner wall of the hole 230d that is orthogonal to the rotation axis of the impeller 221. Positioning in the direction orthogonal to the rotation axis is performed.

FIG. 15 shows the inner casing 230.
c is a perspective view of the suction port Pos and the discharge port Pod, in which a flow direction of air (fluid) is controlled (guided) by being inclined with respect to a reference plane orthogonal to the rotation axis of the impeller 221.
The vanes (draft guides) 230g and 230h are provided.

Next, the features (effects) of this embodiment will be described.

FIG. 16 is a view showing a method of manufacturing the vicinity of a suction port and a discharge port (nose) according to a conventional technique (pump section). Conventionally, a columnar rib for partitioning a suction port Pos and a discharge port Pod is shown. Po1 is formed integrally with the pump casing Pc, and a nose No, which is a separate part, is assembled to the pump casing Pc with a screw.

Since the rotation speed of the impeller 221 is very high (for example, 10 ⁴ rpm), when the impeller 221 rotates, the nose No and the impeller 221 close to the impeller 221 due to the whirling of the impeller 221. Nose No and impeller 2 so that
A predetermined gap (hereinafter, this gap is referred to as a nose gap) is provided between the first and second nips.

At this time, if the nose gap is increased, interference between the nose No and the impeller 221 can be reliably prevented. However, since the nose No has a function of separating the suction side and the discharge side, the nose No. If the gap is increased, the discharge air flows to the suction side, and the pumping performance is significantly reduced. Therefore, the nose gap is usually managed to be 1 mm or less.

For this reason, according to the above-mentioned conventional method, the nose gap has a predetermined dimensional accuracy by performing cutting such as milling on the hatched portion in FIG. 16 (for the nose No, both front and back surfaces). Was like that.

However, with this means, it is difficult to reduce the number of parts and the number of assembling steps, and a blower (air pump)
It is difficult to reduce the manufacturing cost.

On the other hand, there is a means of integrally forming a shape having a function corresponding to the nose No. into the pump casing Pc. However, this means requires that the impeller 221 side of the pump casing Pc be entirely cut. Therefore, although the number of parts can be reduced, it is difficult to reduce the number of manufacturing steps, and it is difficult to reduce the manufacturing cost of the blower (air pump).

On the other hand, in the present embodiment, only the parts requiring dimensional accuracy are separate parts (inner casing 230c) smaller than the integral casing 230, and the suction port Pos, the discharge port Pod and the nose section are formed. Since Pon is integrally formed with the inner casing 230c,
The portion to be cut becomes small, and the number of manufacturing steps can be reduced while reducing the number of parts and the number of assembly steps.

Therefore, the manufacturing cost of the blower (air pump) can be reduced while preventing the pump performance from being significantly reduced.

By the way, when the integral casing 230 is provided with a suction port Pos, a discharge port Pod and a nose Pon,
Suction port Pos, discharge port P to improve ventilation characteristics and noise
If the shapes of the od and the nose Pon are changed, it is necessary to change the entire integral casing 230 (the mold for the integral casing 230), so that the capital investment increases and the production cost of the blower increases. .

On the other hand, in the present embodiment, the suction port P
os, the discharge port Pod and the nose Pon are provided in the inner casing 230c.
There is no need to change the entire 0, and it can be dealt with by a small change. Therefore, an increase in capital investment can be suppressed, and an increase in the manufacturing cost of the blower can be suppressed.

Also, as described above, the integral casing 230
Without changing the whole, the inner casing 230c
By changing the shape of the suction port Pos, the discharge port Pod and the nose Pon, it is possible to optimize the suction port Pos, the discharge port Pod, and the air from the suction port Pos without being affected by the shapes of the suction port Pos and the discharge port Pod. The passage cross-sectional area on the upstream side of the flow and on the downstream side of the air flow from the discharge port Pod can be easily increased. Therefore, the blower can be easily manufactured while keeping the suction resistance and the discharge resistance low.

By adjusting the fixing (mounting) position of the inner casing 230 with respect to the integral casing 230 (parts other than the inner casing 230c), the passage in at least one of the air passages of the suction port Pos and the discharge port Pod is adjusted. The air flow rate may be adjusted by adjusting the cross-sectional area and adjusting the pressure loss of the air passage.

Since the motor Mo has a cantilevered support structure in which one end in the axial direction is fixed to the integral casing 230, if the rigidity of the motor casing 228 is low, the impeller 221 and the motor Mo resonate greatly and vibrate. As a result, the vibration magnification may increase.

On the other hand, in the present embodiment, as shown in FIG.
Since it is formed in a substantially cup shape so as to cover the outside of
The rigidity of the motor casing portion 228 can be increased, and it is possible to prevent the impeller 221 and the motor Mo from resonating greatly and vibrating to increase the vibration magnification.

A vane 23 which controls (guides) the flow direction of air (fluid) is provided at the suction port Pos and the discharge port Pod.
0g and 230h, the inlet Pos and the outlet P
Interference noise and noise of air (fluid) flowing through the inside of the od can be reduced.

Further, since the motor Mo is fixed to the integral casing 230 through the inner casing 230c, as shown in FIG.
21 and other components constituting the blower are integrated into a casing 230.
Can be inserted and assembled from one direction (the side of the impeller 221), and the assembling workability can be improved.

In FIG. 17, in place of the rubber vibration isolator 235b, a metal spring wave washer-like vibration isolator 235b is employed.

(Eleventh Embodiment) In the tenth embodiment,
The motor Mo is fixed to the inner casing 230c by a fastening means such as a screw.
, The motor Mo and the inner casing 23
0c (in the present embodiment, the inner casing 230c) and the other side (in the present embodiment, the motor M
A projection B3 protruding toward o) is provided, and a concave portion (hole) B4 in which the projection B3 fits is provided on the other side, and both Mo and 230c are fastened.

Thus, the manufacturing cost of the blower (air pump) can be reduced as compared with the case where the motor Mo and the inner casing 230c are fastened with screws.

(Twelfth Embodiment) In the above embodiment,
Although the pump cover 241 is assembled to the integral casing 230 by a fastening means such as a screw via a packing such as an O-ring, as shown in FIG. 19, in this embodiment, a thin metal plate such as S60C is To give a spring characteristic to the pump cover 241 (particularly, a fitting part with the integral casing 230),
The pump cover 241 is fixed to the integral casing 230 by press-fitting into an annular groove 230j formed at zero.

(Other Embodiments) In the above embodiment, the present invention is applied to the air pump. However, the present invention is not limited to this, and can be applied to other pumps.

In the above embodiment, the integral casing 230 is made of metal. However, the present invention is not limited to this, and may be made of other materials such as resin.

In the above embodiment, the bearing 236,
Although a rolling bearing is used as 237, other types of bearings such as a sliding bearing may be used.

In the above-described embodiment, the air pump is of the Wesco type. However, the pump type is not limited to this, and may be another type such as a once-through type.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a vehicle heating device using an air pump according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a combustor using the air pump according to the first embodiment of the present invention.

FIG. 3 is an exploded perspective view of the air pump (blower) according to the first embodiment of the present invention.

FIG. 4 is a sectional view of an air pump (blower) according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a bottom cover part of an air pump (blower) according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a bottom cover part of an air pump (blower) according to a third embodiment of the present invention.

FIG. 7 is a sectional view of a bottom cover portion of an air pump (blower) according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a bottom cover portion of an air pump (blower) according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view of a bottom cover portion of an air pump (blower) according to a sixth embodiment of the present invention.

FIG. 10 is a sectional view of a bottom cover portion of an air pump (blower) according to a seventh embodiment of the present invention.

FIG. 11 is a sectional view of a bottom cover portion of an air pump (blower) according to an eighth embodiment of the present invention.

12A is a cross-sectional view of an air pump (blower) according to a ninth embodiment of the present invention, and FIG.
It is A sectional drawing.

FIG. 13 is a sectional view of an air pump (blower) according to a tenth embodiment of the present invention.

FIG. 14 is a top view of FIG.

FIG. 15 is an external view of an inner casing according to a tenth embodiment of the present invention.

FIG. 16 is an explanatory view showing a method for manufacturing the vicinity of a suction port and a discharge port (nose) according to a conventional technique (pump).

FIG. 17 is an exploded view of an air pump according to a tenth embodiment of the present invention.

FIG. 18 is a sectional view of an air pump (blower) according to an eleventh embodiment of the present invention.

FIG. 19 is an explanatory view showing a method of fixing a pump cover in an air pump according to a twelfth embodiment of the present invention.

[Explanation of symbols]

221 impeller (impeller), 230 integrated casing, 233 motor cap, 234 bottom cover, 235
Packing, 236, 237 ... bearing.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takanori Narahara 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside DENSO Corporation (72) Inventor Koji Mori 1-1-1, Showa-cho, Kariya-shi, Aichi Co., Ltd. F term in DENSO (reference) 3H022 AA01 AA02 BA01 CA04 CA11 CA29 DA08 3H034 AA01 AA02 AA15 BB04 BB06 CC03 CC06 DD01 EE09 EE12

Claims (14)

[Claims] An impeller (22) for sucking and discharging a fluid.
1) and the impeller (22)
1) a fluid pump in which an electric motor unit for rotating and driving 1) is integrated, wherein a motor casing unit (228) accommodating a rotor (224) of the electric motor unit and a pump accommodating the impeller (221) An integral casing (230) in which a casing part (229) is integrated; and an integral casing (230) provided on the impeller (221) side;
4) a bearing (236) for rotatably supporting the shaft (227), and the integral casing (230) includes the bearing (23).
6) A fluid pump comprising a fixing portion (238) for fixing the fluid pump. 2. The integrated casing (230)
An opening (232) for inserting the rotor (224) into the integral casing (230) is provided on a side opposite to the impeller (221) side in a direction parallel to the longitudinal direction of the shaft (227). Being formed,
The opening (232) is closed by a cover member (233), and the cover member (233) further includes the fixing portion (23).
8) formed to have a predetermined coaxiality with respect to
The fluid pump according to claim 1, further comprising a support (239) for supporting the shaft (227). 3. The fluid pump according to claim 1, wherein the support section (239) rotatably supports the shaft (227) via a bearing (237). 4. The fluid pump according to claim 2, wherein the coaxiality is IT3 to IT4. 5. A sealing means (235) for hermetically sealing the opening (232) on the side of the opening (232). 4. A fluid pump according to claim 1. 6. An impeller (22) for sucking and discharging a fluid.
1) and the impeller (22)
1) a fluid pump in which an electric motor unit for rotating and driving 1) is integrated, wherein a motor casing unit (228) accommodating a rotor (224) of the electric motor unit and a pump accommodating the impeller (221) An integral casing (230) in which a casing part (229) is integrated; and an integral casing (230) provided on the impeller (221) side;
4) a bearing (236) for rotatably supporting the shaft (227), and the integral casing (230) includes the rotor (22).
4) a bearing portion (236a) for contacting the shaft (227) and rotatably supporting the shaft (227) for adjustment;
A fluid pump characterized in that a fluid pump is provided. 7. An impeller (22) for sucking and discharging a fluid.
1) and the impeller (22)
1) a fluid pump in which an electric motor (Mo) for rotating and driving 1) is integrated, wherein a motor casing (228) for housing the electric motor (Mo) and a pump casing for housing the impeller (221) Part (229) and an integral casing (230). The suction part (Pos) and the discharge port (P) of the pump part (Po) are provided.
od) and a nose part (Pon) are formed separately from the integral casing (230).
A fluid pump provided in 30c). 8. The fluid pump according to claim 7, wherein the integral casing (230) and the inner casing (230c) are fastened by mechanical fastening means (B1, B2 to B4). . 9. An impeller (22) for sucking and discharging a fluid.
1) and the impeller (22)
1) a fluid pump in which an electric motor (Mo) for rotating and driving 1) is integrated, wherein the electric motor (Mo) is provided at the axial end of the integrated casing (230) on the impeller (221) side. ), And a motor casing (228) for housing the electric motor (Mo) is formed so as to cover the outside of the electric motor (Mo). 10. A suction port (Po) of the pump section (Po).
s), an inner casing (230c) having a discharge port (Pod) and a nose portion (Pon) is provided separately from the integral casing (230). The fluid pump according to claim 9, wherein the fluid pump is fixed to the integral casing (230) via a through hole. 11. An axial end of the electric motor (Mo) is pressed toward one axial end by elastic force of an elastic means (235b).
A fluid pump according to claim 1. 12. The inner casing (230c).
The suction port (Pos) and the discharge port (Po
d) at least one of the impellers (221);
12. A guide part (230h) which guides fluid in a predetermined direction while being inclined with respect to a reference plane orthogonal to the rotation axis of the rotary shaft. Fluid pump. 13. The integrated casing (230) includes:
A hole (230d) into which the inner casing (230c) is inserted and mounted is formed. Further, the outer wall of the inner casing (230c) is formed by the hole (2c).
The fluid pump according to any one of claims 10 to 12, wherein the fluid pump is positioned with respect to the integral casing (230) by contacting an inner wall of 30d). 14. A combustion section (210) for burning fuel.
And the fluid pump (220) according to any one of claims 1 to 13, wherein the integral casing (23) of the fluid pump (220) is provided.
0), an air passage (23) for supplying air discharged from the fluid pump (220) to the combustion unit (210).
A combustor characterized in that 1) is provided.