JP4850665B2 - Fluid pump device - Google Patents

Description

  The present invention relates to a fluid pump device in which a rotational force of a motor is transmitted to an impeller member in a non-contact manner.

Conventionally, as a fluid pump device, a motor and an impeller member are accommodated in a motor case, the driving force of the motor is transmitted to the impeller member in a non-contact manner, and the impeller member rotates in a pump chamber formed in the motor case. As a result, there is a case in which the fluid drawn into the pump chamber is discharged to the outside through an outlet formed in a part in the circumferential direction of the pump chamber. As such a fluid pump device, for example, there is one in which an impeller shaft that rotatably supports an impeller member is fixed to a motor case via an elastic member, and the impeller member is float supported with respect to the motor case. (For example, refer to Patent Document 1). In such a fluid pump device, since the impeller member is float-supported with respect to the motor case, it is possible to reduce the vibration caused by the imbalance of the impeller member, the magnetic circuit of the motor, etc. from the impeller member to the motor case. The Therefore, for example, in a vehicle equipped with this fluid pump device, it is possible to reduce indoor noise or the like due to vibration.
JP 2005-320954 A

  By the way, in the fluid pump apparatus as described above, during driving, a force directed toward the outlet along with the fluid toward the outlet is applied to the impeller member (impeller shaft). Then, since the impeller member (impeller shaft) is float supported with respect to the motor case, there is a problem that the impeller member (impeller shaft) is largely displaced in the outlet direction (while greatly compressing the elastic member). This causes the impeller member to come into contact with the motor case (inner wall of the pump chamber), which in turn causes noise (sliding sound or collision sound) due to the impeller member. In addition, the impeller member may be deformed or damaged.

  The present invention has been made to solve the above-described problems, and its object is to reduce the transmission of vibrations caused by imbalance of the impeller member, the magnetic circuit of the motor, etc. from the impeller member to the motor case. It is another object of the present invention to provide a fluid pump device that can further suppress the amount of displacement of the impeller member toward the outflow port.

According to the first aspect of the present invention, the motor and the impeller member are accommodated in the motor case, and the driving force of the motor is transmitted to the impeller member in a non-contact manner, in a pump chamber formed in the motor case. In the fluid pump device in which the fluid drawn into the pump chamber due to rotation of the impeller member is discharged to the outside through an outlet formed in a part in the circumferential direction of the pump chamber, the impeller member includes: An impeller shaft that rotatably supports the impeller member is fixed to the motor case via an elastic member, so that the motor case is float-supported, and the motor case has a circular inner peripheral surface holding portion. The impeller shaft is formed in a columnar shape, and the elastic member is formed in an annular shape having a thick portion at a part in the circumferential direction, and the thick portion is Serial to be disposed between the impeller shaft and the outlet, which is held in a compressed state fitted on to radially internally fitted to and the impeller shaft to the holding portion.

  According to this configuration, since the impeller member is float-supported with respect to the motor case, vibrations caused by imbalance of the impeller member, the magnetic circuit of the motor, and the like are reduced from being transmitted from the impeller member to the motor case. Therefore, for example, in a vehicle equipped with this fluid pump device, it is possible to reduce indoor noise or the like due to vibration. In addition, although the impeller member is float-supported, slight displacement in the radial direction is allowed, but since it is float-supported so as not to be displaced in the radial outlet direction, Even when a force toward the outlet is applied together with the fluid toward the outlet, for example, the amount of displacement toward the outlet is reduced compared to the case where the ease of displacement is uniform in the circumferential direction. Therefore, it can reduce that an impeller member contacts a motor case (inner wall of a pump chamber), and also the noise (sliding sound and collision sound) resulting from it can also be reduced. Furthermore, deformation and breakage due to contact of the impeller member with the motor case can be reduced.

According to this configuration, the elastic member reduces that the vibration caused by the imbalance of the impeller member or the magnetic circuit of the motor is transmitted from the impeller shaft that rotatably supports the impeller member to the motor case. And since an elastic member is arrange | positioned so that it may become difficult to elastically deform between an impeller shaft and an outflow port, an impeller member becomes difficult to displace to a radial outflow port direction with an impeller shaft .

According to this configuration, the elastic member is formed in an annular shape having a thick portion at a part in the circumferential direction, and the inner peripheral surface is arranged so that the thick portion is disposed between the impeller shaft and the outlet. Since it is fitted in a circular holding portion and is fitted on a cylindrical impeller shaft and held in a radially compressed state, it is difficult to elastically deform between the impeller shaft and the outlet. Therefore, the above effect can be obtained while the holding portion and the impeller shaft have a simple shape.

Section in the invention according to claim 2, in the fluid pump device according to claim 1, wherein the elastic member is an elastic ring member of circular cross section, the thick portion is formed by a large diameter of the cross section Thick part.

  According to the same configuration, the elastic member is an elastic ring member having a circular cross section, and the thick part is a thick part of the cross section whose diameter of the cross section is increased. The effect of the invention of claim 3 can be obtained.

In the invention described in claim 3, in the fluid pump device according to claim 1, wherein the elastic member is a substantially cylindrical elastic cylindrical member having a plurality of protrusions circumferentially on the outer periphery, the meat The thick part is a protruding thick part obtained by enlarging a part of the protruding part in the circumferential direction.

According to this configuration, the elastic member is a substantially cylindrical elastic cylindrical member having a plurality of protrusions in the circumferential direction on the outer periphery thereof, and the thick part has a part of the protrusion in the circumferential direction enlarged. Since it is the protrusion thick part which becomes, the effect of the invention of Claim 1 can be acquired, making it an elastic member of a simple shape. In addition, since the contact portion between the holding portion and the elastic member has a plurality of points in the circumferential direction, vibration (force) is dispersed, and transmission of vibration from the impeller member to the motor case is further reduced.

In a fourth aspect of the present invention, a motor and an impeller member are accommodated in a motor case, and the driving force of the motor is transmitted to the impeller member in a non-contact manner, in a pump chamber formed in the motor case. In the fluid pump device in which the fluid drawn into the pump chamber due to rotation of the impeller member is discharged to the outside through an outlet formed in a part in the circumferential direction of the pump chamber, the impeller member includes: An impeller shaft that rotatably supports the impeller member is fixed to the motor case via an elastic member, so that the motor case is float-supported , and the inner peripheral surface of the motor case is held in a substantially circular shape. A portion is formed, the impeller shaft is formed in a substantially cylindrical shape, and the elastic member is formed in an annular shape having a uniform shape in the circumferential direction, and is fitted into the holding portion. And is held in a radially compressed state by being externally fitted to the impeller shaft, and the diameter of the at least one of the inner peripheral surface of the holding portion and the outer peripheral surface of the impeller shaft is on the outlet side in the radial direction. A projecting portion extending in the direction was formed.

According to this configuration, since the impeller member is float-supported with respect to the motor case, vibrations caused by imbalance of the impeller member, a motor magnetic circuit, and the like are reduced from being transmitted from the impeller member to the motor case. Therefore, for example, in a vehicle equipped with this fluid pump device, it is possible to reduce indoor noise or the like due to vibration. In addition, although the impeller member is float-supported, slight displacement in the radial direction is allowed, but since it is float-supported so as not to be displaced in the radial outlet direction, Even when a force toward the outlet is applied together with the fluid toward the outlet, for example, the amount of displacement toward the outlet is reduced compared to the case where the ease of displacement is uniform in the circumferential direction. Therefore, it can reduce that an impeller member contacts a motor case (inner wall of a pump chamber), and also the noise (sliding sound and collision sound) resulting from it can also be reduced. Furthermore, deformation and breakage due to contact of the impeller member with the motor case can be reduced.
Further, the elastic member reduces that the vibration caused by the unbalance of the impeller member, the magnetic circuit of the motor, and the like is transmitted to the motor case from the impeller shaft that rotatably supports the impeller member. And since an elastic member is arrange | positioned so that it may become difficult to elastically deform between an impeller shaft and an outflow port, an impeller member becomes difficult to displace to a radial outflow port direction with an impeller shaft.
Further, the elastic member is formed in an annular shape having a uniform shape in the circumferential direction, and is fitted into a holding portion having an inner circumferential surface of a substantially circular shape, and is fitted onto a substantially cylindrical impeller shaft to be compressed in the radial direction. It is held in the state. And since the convex part extended in radial direction is formed in the radial outflow side in at least one of the inner peripheral surface of a holding part, and the outer peripheral surface of an impeller shaft, an elastic member is an impeller shaft and an outflow port. It becomes difficult to elastically deform between. Therefore, the above effect can be obtained while the elastic member has a simple shape.

  According to the present invention, it is possible to reduce the vibration caused by the unbalance of the impeller member, the magnetic circuit of the motor, etc. from the impeller member to the motor case, and further reduce the displacement amount of the impeller member to the outlet side. A fluid pump device that can be suppressed can be provided.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the fluid pump device includes a motor side case 1, a motor side cover 2, a pump side case 3, a motor main body 4 as a motor, an impeller member 5, an impeller shaft 6, and an elastic member. And a motor-side elastic ring member 7 and a pump-side elastic ring member 8 as elastic ring members. In the present embodiment, the motor side case 1, the motor side cover 2, and the pump side case 3 constitute a motor case.

  The motor-side case 1 is made of a resin material and includes a substantially cylindrical cylindrical portion 1a and a partition wall 1b that partitions the inside thereof. As shown in FIG. 2, the partition wall 1b of the present embodiment includes a disk part 1c extending radially inward from one opening side end K1 of the cylindrical part 1a, and the other opening of the cylindrical part 1a from the disk part 1c. It consists of a small diameter cylindrical portion 1d extending to the side (right side in FIGS. 1 and 2) and a bottom portion 1e that closes the tip of the small diameter cylindrical portion 1d. At the center of the bottom portion 1e, a motor side holding portion 1g is formed as a holding portion having a circular inner peripheral surface extending in a cylindrical shape on one opening side (left side in FIGS. 1 and 2) of the cylindrical portion 1a. . The motor-side case 1 is partitioned by a partition wall 1b, so that a motor housing portion 1h for housing the motor body 4 and a pump chamber constituting a part of a pump chamber P described later are included therein. The component 1i is formed.

  As shown in FIG. 1, a motor main body 4 is accommodated in the motor accommodating portion 1h formed on the other opening side (right side in FIG. 1) of the cylindrical portion 1a, and the other opening side end of the cylindrical portion 1a. The motor side cover 2 is fixed to the part. The motor body 4 of the present embodiment is a direct current motor, and includes a yoke 11, a stator magnet 12 fixed to the inner peripheral surface of the yoke 11, and an armature 13 disposed inside the stator magnet 12. The armature 13 has a rotating shaft 14, and one end of the rotating shaft 14 is supported by a bearing 15 fixed to the bottom 1 e of the partition wall 1 b and the other end is fixed to the motor side cover 2. It is supported so that it can rotate. An outer ring magnet 17 that is one of coupling magnets is fixed to one end side of the rotating shaft 14 via a collar. The outer ring magnet 17 includes a disc portion 17a extending radially outward of the rotating shaft 14, a cylindrical portion 1a of the motor-side case 1 extending from the outer edge of the disc portion 17a, and a small-diameter cylindrical portion 1d of the partition wall 1b. The cylinder part 17b arrange | positioned in the clearance gap between.

  The pump side case 3 is made of a resin material. The pump-side case 3 includes a substantially cylindrical pump tube portion 3a, a curved portion 3b extending in a curved shape so that the inner diameter becomes smaller from one end side (left side in FIG. 2) of the pump tube portion 3a, and a curved portion An inflow tube portion 3c extending in a substantially cylindrical shape from one end side of 3b, and an outflow tube portion 3d extending outwardly (in FIG. 2, the back side in the drawing) so as to communicate with a hole formed in the peripheral wall of the pump tube portion 3a. With. In the present embodiment, the front end portion of the inflow tube portion 3c is the inflow port 3e, and the base end portion of the outflow tube portion 3d (the front end portion in FIG. A portion opened at a position corresponding to the peripheral surface) is an outlet 3f.

  The pump-side case 3 includes a rib 3g extending obliquely from the inner wall (inner surface) of the curved portion 3b to the shaft center side and the other end side (right side in FIG. 2) of the pump cylinder portion 3a, and a tip of the rib 3g. A pump-side holding portion 3h is formed as a holding portion having a circular inner peripheral surface disposed on the shaft center. The pump side holding portion 3h is formed in a substantially bottomed cylindrical shape with an opening on the counterflow inlet side (right side in FIG. 2). Incidentally, the ribs 3g of the present embodiment are formed at equal angular intervals in the circumferential direction (only two are shown in FIGS. 1 and 2).

  And the opening side end K2 of the pump cylinder part 3a in the pump side case 3 is fixed to one opening side end K1 of the cylindrical part 1a in the motor side case 1, so that the pump chamber constituting part 1i and the pump side A pump chamber P is formed by the inner surface of the case 3. At this time, the impeller shaft 6 is supported by the motor side holding portion 1g and the pump side holding portion 3h.

  Specifically, the impeller shaft 6 is made of a cylindrical metal material, and both ends thereof are supported (fixed) on the motor side holding portion 1g and the pump side holding portion 3h via the motor side elastic ring member 7 and the pump side elastic ring member 8. ), The float is supported (relative to the motor case).

  The motor side elastic ring member 7 is made of a rubber material. The motor-side elastic ring member 7 is formed in an annular shape having a circular cross section, and, as shown in FIG. 3, the diameter of the cross section is partly in the circumferential direction (in the range of 90 ° in the present embodiment). It has a cross-section thick part 7b as a thick part that is made larger than the normal part 7a which is another part. The motor-side elastic ring member 7 (normal portion 7a and thick section 7b) has an outer diameter set slightly larger than the inner diameter of the motor-side holding portion 1g, and the inner diameter is set slightly smaller than the outer diameter of the impeller shaft 6. Has been. The motor-side elastic ring member 7 has a thick section 7b in the cross section disposed between the impeller shaft 6 and the outlet 3f (positioned in the circumferential direction). It is internally fitted and externally fitted to the impeller shaft 6 and is held in a radially compressed state. In other words, the motor-side elastic ring member 7 is disposed so as not to be elastically deformed between the impeller shaft 6 and the outlet 3f (compared to other radial directions). In addition, the motor side elastic ring member 7 shown in FIG. 3 is a single item view in a state where it is not held (not compressed) between the motor side holding portion 1g and the impeller shaft 6.

  The pump-side elastic ring member 8 of the present embodiment is formed in the same manner as the motor-side elastic ring member 7 (having a normal portion 8a and a cross-sectional thickness portion 8b), and the cross-sectional thickness portion 8b is In order to be disposed between the impeller shaft 6 and the outflow port 3f, the pump side holding portion 3h is fitted inside and the impeller shaft 6 is fitted outside and held in a radially compressed state. That is, similarly to the motor-side elastic ring member 7, the pump-side elastic ring member 8 is arranged so that it is difficult to elastically deform between the impeller shaft 6 and the outlet 3f (compared to other radial directions). It is installed. Thereby, the impeller shaft 6 is float-supported so as not to be displaced in the radial outlet 3f direction (compared to other radial directions) with respect to the motor case.

  At this time (when the pump side case 3 is fixed to the motor side case 1), the impeller member 5 is accommodated in the pump chamber P. Specifically, the impeller member 5 includes an impeller body 21, an inner ring magnet 22 that is the other of the coupling magnets, and a bearing (metal bearing) 23.

  The impeller body 21 is disposed in the pump cylinder part 3a, and the impeller part 21a extends in a cylindrical shape from the impeller part 21a and is arranged in the pump chamber component 1i (between the small diameter cylinder part 1d and the motor side holding part 1g). The impeller cylinder portion 21b. The inner ring magnet 22 is formed in a cylindrical shape, and is fitted and fixed to the outer peripheral surface of the impeller cylinder portion 21b. The bearing 23 is formed in a cylindrical shape, and is fitted and fixed to the inner peripheral surface of the central hole of the impeller portion 21a.

  And the impeller member 5 is rotatably supported by the bearing 23 being rotatably fitted to the impeller shaft 6. A metal ring 24 is provided at each opening side end of the motor side holding portion 1g and the pump side holding portion 3h. When the bearing 23 abuts on the metal ring 24, the impeller member 5 has a further axial direction. Movement is restricted. Further, the impeller portion 21a is formed by connecting a plurality of wing portions arranged in an annular shape. When the impeller portion 21a is rotated, the impeller portion 21a draws fluid existing in the axial direction and radiates radially outward.

  In the fluid pump device configured as described above, when power is supplied to the motor body 4, the armature 13 is rotationally driven. Then, the outer ring magnet 17 is rotated together with the rotating shaft 14, and the driving force of the motor body 4 is transmitted to the impeller member 5 in a non-contact manner by the magnetic action between the outer ring magnet 17 that is a coupling magnet and the inner ring magnet 22. Is rotated. Then, the fluid on the inflow tube portion 3c side is drawn into the pump chamber P and discharged from the outflow tube portion 3d via the outflow port 3f.

Next, characteristic effects of the above embodiment will be described below.
(1) The impeller shaft 6 that rotatably supports the impeller member 5 is float-supported with respect to the motor case (the motor side case 1, the motor side cover 2, and the pump side case 3), so that the impeller member 5 becomes the motor case. Is supported by a float. Therefore, it is possible to reduce the vibration caused by the unbalance of the impeller member 5 and the magnetic circuit of the motor body 4 from the impeller member 5 to the motor case. Therefore, for example, indoor noise in a vehicle equipped with a fluid pump device can be reduced. Moreover, although the impeller member 5 is float supported, a slight displacement in the radial direction is allowed, but the impeller member 5 is float supported so as not to be displaced in the radial outlet 3f direction. Even if a force toward the outlet 3f is applied together with the fluid flowing toward the outlet 3f, the amount of displacement toward the outlet 3f can be suppressed smaller than when the ease of displacement is uniform in the circumferential direction. Therefore, it can reduce that the impeller member 5 contacts a motor case (inner wall of the pump chamber P), and also can reduce the noise (sliding sound and a collision sound) resulting from it. it can. Furthermore, deformation and breakage due to contact of the impeller member 5 with the motor case can be reduced.

  (2) The motor-side holding portion 1g and the pump-side holding portion 3h as holding portions have simple shapes because the inner peripheral surface is circular. The impeller shaft 6 has a simple shape because it is only formed in a cylindrical shape. Further, the motor-side elastic ring member 7 and the pump-side elastic ring member 8 as elastic members are elastic ring members having a circular cross section, and the diameter of the cross section is another part in the circumferential direction. Since it has only the cross-sectional thickness part 7b as a thick part enlarged compared with the part 7a, it is a simple shape.

  (3) Since both ends of the impeller shaft 6 are fixed to the motor case via the motor side elastic ring member 7 and the pump side elastic ring member 8, respectively, only one end side is fixed to the motor case via the elastic member. The impeller shaft 6 can be satisfactorily prevented from collapsing as compared with the case where the other end is not fixed.

The above embodiment may be modified as follows.
In the above embodiment, the impeller shaft 6 is fixed (float supported) to the motor case via the motor-side elastic ring member 7 and the pump-side elastic ring member 8 at both ends, but is not limited thereto. As shown in FIG. 4, even if the configuration is changed so that only one end side (right side in FIG. 4) of the impeller shaft 6 is float supported (the other end side (left side in FIG. 4) is not supported). Good. That is, as shown in FIG. 4, the pump side holding portion 3 h and the rib 3 g of the above embodiment are omitted, and one end side (right side in FIG. 4) of the impeller shaft 6 is interposed via a pair of motor side elastic ring members 7. Then, it may be fixed (float supported) only to the motor side holding portion 1g. In this example, the C ring 25 is fixed to the other end side (left side in FIG. 4) of the impeller shaft 6, and the impeller member 5 moves further in the axial direction when the bearing 23 comes into contact with the C ring 25. Is regulated. If it does in this way, compared with the said embodiment, since there is no pump side holding | maintenance part 3h and the rib 3g, resistance of a fluid is reduced and it can aim at high efficiency.

  In the above embodiment, the elastic members are the motor-side elastic ring member 7 and the pump-side elastic ring member 8 having a circular cross section. However, the elastic members are not limited to this, and may be changed to elastic members having other shapes. For example, as shown in FIGS. 5 to 7, the motor-side protruding portion 51 a as a plurality of (eight at equal angular intervals) protruding portions on the outer periphery of the motor-side elastic ring member 7 of the above-described embodiment. It is good also as the substantially cylindrical motor side elastic cylindrical member 51 which has (refer FIG.6 and FIG.7). In the motor-side elastic cylindrical member 51, a part (three) of the motor-side protrusions in the circumferential direction is larger than the other (five) of the motor-side protrusions 51a, and a protrusion-thick part. Motor side protruding thick part 51b. In this example, the pump-side elastic ring member 8 of the above-described embodiment has a substantially cylindrical shape having pump-side protrusions 52a as a plurality of protrusions (six at regular angular intervals) in the circumferential direction on the outer periphery thereof ( The pump-side elastic cylindrical member 52 has a substantially bottomed cylindrical shape. In the pump-side elastic cylindrical member 52, a part (two) of the pump-side protrusions in the circumferential direction is made larger than the other (four) pump-side protrusions 52a and a protrusion-thick part. The pump-side protruding thick part 52b.

  The motor-side elastic cylindrical member 51 is positioned in the circumferential direction so that the motor-side protruding thick part 51b (the center of the three) is disposed between the impeller shaft 6 and the outlet 3f. And is held in a state of being fitted into the motor side holding portion 1j and fitted to the impeller shaft 6 and compressed in the radial direction. The pump-side elastic cylindrical member 52 is positioned in the circumferential direction so that the pump-side protruding thick part 52b (the middle of the two) is disposed between the impeller shaft 6 and the outlet 3f. And is fitted in the pump side holding portion 3h and is fitted in the small diameter portion 6a of the impeller shaft 6 and held in a state compressed in the radial direction.

  Even if it does in this way, it will reduce that the vibration resulting from the imbalance of the impeller member 5, the magnetic circuit of the motor main body 4, etc. is transmitted from the impeller member 5 to a motor case. Therefore, for example, indoor noise in a vehicle equipped with a fluid pump device can be reduced. Moreover, although the impeller member 5 is float supported, a slight displacement in the radial direction is allowed, but the impeller member 5 is float supported so as not to be displaced in the radial outlet 3f direction. Even if a force toward the outlet 3f is applied together with the fluid flowing toward the outlet 3f, the amount of displacement toward the outlet 3f can be suppressed smaller than when the ease of displacement is uniform in the circumferential direction. Therefore, it can reduce that the impeller member 5 contacts a motor case (inner wall of the pump chamber P), and also can reduce the noise (sliding sound and a collision sound) resulting from it. it can. Furthermore, deformation and breakage due to contact of the impeller member 5 with the motor case can be reduced.

  Moreover, since each contact part of the motor side holding | maintenance part 1j and the motor side elastic cylindrical member 51 and the pump side holding | maintenance part 3h and the pump side elastic cylindrical member 52 becomes a plurality of points in the circumferential direction, vibration (force) is dispersed, Transmission of vibration from the impeller member 5 to the motor case is further reduced.

  Further, since the motor side protrusion 51a including the motor side protrusion thick part 51b and the pump side protrusion 52a including the pump side protrusion thick part 52b are provided at equal angular intervals in the circumferential direction, the motor side holding part 1j In addition, the contact portions with the pump-side holding portion 3h become a plurality of points at equiangular intervals in the circumferential direction, and transmission of vibration from the impeller member 5 to the motor case is reduced in a balanced manner.

  The motor-side elastic cylindrical member 51 and the pump-side elastic cylindrical member 52 disposed on both ends of the impeller shaft 6 are a motor-side protruding portion 51a including a motor-side protruding thick portion 51b, and a pump-side protruding thick portion 52b. Therefore, the vibration (force) is further dispersed and the transmission of vibration from the impeller member 5 to the motor case is further reduced. Of course, the motor side protrusion 51a including the motor side protrusion thick part 51b and the pump side protrusion 52a including the pump side protrusion thick part 52b may be provided at unequal angular intervals in the circumferential direction. You may change each of those numbers.

  In the above embodiment, the motor-side elastic ring member 7 and the pump-side elastic ring member 8 have thick section 7b, 8b in a part of the circumferential direction, and the thick sections 7b, 8b are impellers. Although it is arranged between the shaft 6 and the outflow port 3f so as not to be elastically deformed therebetween, it may be difficult to be elastically deformed between the impeller shaft 6 and the outflow port 3f in other configurations. For example, as shown in FIG. 8, the motor-side elastic ring member 7 and the pump-side elastic ring member 8 of the above embodiment are annularly shaped in the circumferential direction (without the cross-section thick portions 7 b and 8 b). The elastic ring member 61 is formed as follows. A projecting portion 1k extending radially inward is formed on the radial outlet 3f side on the inner peripheral surface of the motor side holding portion 1g (pump side holding portion 3h), and the radial direction on the outer peripheral surface of the impeller shaft 6 is formed. A protruding portion 6b extending radially outward may be formed on the outflow port 3f side. Even if it does in this way, the elastic ring member 61 becomes difficult to elastically deform between the impeller shaft 6 and the outflow port 3f. Of course, the protruding portion 1k may be omitted and only the protruding portion 6b may be omitted, or the protruding portion 6b may be omitted and only the protruding portion 1k may be provided.

  As shown in FIG. 9, the same cross-sectional thickness is also provided on the side opposite to the cross-section thick portions 7b and 8b (outlet 3f side) in the motor-side elastic ring member 7 and the pump-side elastic ring member 8 of the above embodiment. Thick portions 7c and 8c may be provided. In this way, the amount of displacement of the impeller member 5 to the opposite side of the outlet 3f can also be kept small. Therefore, it is suppressed that the impeller member 5 is repeatedly shaken to the outflow port 3f side and the opposite side (vibration thereof).

  In the above embodiment, the impeller shaft 5 that rotatably supports the impeller member 5 is float-supported with respect to the motor case, so that the impeller member 5 is float-supported with respect to the motor case. However, the impeller member is the motor case. However, it is not limited to this as long as it is float supported. For example, the impeller shaft may be rigidly fixed to the motor case without being float supported, and the impeller member may be float supported with respect to the impeller shaft. Further, for example, a rotary impeller shaft that rotates integrally with the impeller member may be provided (in place of the impeller shaft 6), and the rotary impeller shaft may be float supported so as to be rotatable with respect to the motor case.

  In the above embodiment, the impeller shaft 6 is float supported by being fixed to the motor case via the elastic members (the motor-side elastic ring member 7 and the pump-side elastic ring member 8), but a member other than the elastic member is used. Alternatively, the impeller member may be float supported by another mechanism. For example, the impeller member may be float supported with respect to the motor case by a magnetic bearing that is supported in a non-contact manner. In this case, of course, it is necessary to support the float so that the impeller member is not easily displaced in the radial outlet direction (compared to other radial directions).

  In the above-described embodiment, the driving force of the motor body 4 is reduced by the coupling magnets (the outer ring magnet 17 and the inner ring magnet 22) provided on the rotor of the motor body 4 (the rotation shaft 14 of the armature 13) and the impeller member 5. Although it is transmitted by contact, it may be changed to another configuration as long as the driving force of the motor is transmitted to the impeller member without contact. For example, by providing a rotor (for example, a rotor magnet) on an impeller member with respect to a motor stator (for example, a brushless motor stator that generates a rotating magnetic field) fixed to a motor case, the driving force of the motor is made non-contact. May be transmitted to the impeller member.

The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.
(B) a plurality of said protrusions including a pre-Symbol protruding thick part, you characterized in that provided at equal angular intervals in the circumferential direction.

  According to this configuration, since the plurality of protruding portions including the protruding thick portion are provided at equiangular intervals in the circumferential direction, the contact portion with the holding portion becomes a plurality of points at equiangular intervals in the circumferential direction, and the vibration is impeller. Transmission from the member to the motor case is reduced in a well-balanced manner.

(Ii) both ends of the front Symbol impeller shaft, characterized in that fixed to the motor case respectively via the elastic member.

  According to the same configuration, since both ends of the impeller shaft are fixed to the motor case via the elastic member, only one end side is fixed to the motor case via the elastic member (the other end side is not fixed). Compared to the above, the impeller shaft can be prevented from falling down.

(C) both ends of the front Symbol impeller shaft is secured to the motor case via the respective said elastic members, two of the elastic members disposed at both ends of the impeller shaft, the protruding at its one and the other the number of the projecting portion including a thick portion you wherein different.

  According to the same configuration, since both ends of the impeller shaft are fixed to the motor case via the elastic member, only one end side is fixed to the motor case via the elastic member (the other end side is not fixed). Compared to the above, the impeller shaft can be prevented from falling down. In addition, since the two elastic members arranged on both ends of the impeller shaft have different numbers of protrusions including protruding thick parts on one side and the other, vibration (force) is further dispersed, and vibration is generated from the impeller member. Transmission to the motor case is further reduced.

The principal part sectional drawing of the fluid pump apparatus in this Embodiment. The principal part expanded sectional view of the fluid pump apparatus in this Embodiment. The top view of the motor side and pump side elastic ring member in this Embodiment. The principal part expanded sectional view of the fluid pump apparatus in another example. The principal part expanded sectional view of the fluid pump apparatus in another example. The disassembled perspective view of the impeller shaft and the motor side and pump side elastic cylindrical member in another example. The top view of the motor side and pump side elastic cylindrical member in another example. The top view of the elastic ring member in another example, a motor side holding | maintenance part, and an impeller shaft. The top view of the motor side and pump side elastic ring member in another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Motor side case which comprises a part of motor case, 1g ... Motor side holding part (holding part), 1k ... Projection part, 2 ... Motor side cover which comprises a part of motor case, 3 ... Motor case Pump side case, 3f ... outlet, 3h ... pump side holding part (holding part), 4 ... motor body (motor), 5 ... impeller member, 6 ... impeller shaft, 6b ... projecting part, 7 ... motor side elastic ring member (elastic member and elastic ring member), 7b, 8b ... thick section of cross section (thick part), 8 ... pump side elastic ring member (elastic member and elastic ring member), 51 ... motor side elasticity Cylindrical member (elastic member and elastic cylindrical member), 51a ... motor side protruding portion (projecting portion), 51b ... motor side protruding thick portion (thick portion and protruding thick portion), 52 ... pump side elastic cylindrical member (elastic) Member and elastic cylindrical member), 5 a ... pump side protrusions (protruding portions) 52 b ... pump side projecting thickness portion (thick portion and the protruding wall thickness portion), 61 ... elastic ring member (elastic member), P ... pump chamber.

Claims (4)

A motor and an impeller member are accommodated in the motor case, the driving force of the motor is transmitted to the impeller member in a non-contact manner, and the impeller member rotates in the pump chamber formed in the motor case. In the fluid pump device in which the fluid drawn into the pump chamber is discharged to the outside through an outlet formed in a part in the circumferential direction of the pump chamber.
The impeller member is float supported with respect to the motor case by an impeller shaft that rotatably supports the impeller member being fixed to the motor case via an elastic member,
The motor case is formed with a holding portion having a circular inner peripheral surface,
The impeller shaft is formed in a cylindrical shape,
The elastic member is formed in an annular shape having a thick portion at a part in a circumferential direction, and is fitted into the holding portion so that the thick portion is disposed between the impeller shaft and the outlet. A fluid pump device, wherein the fluid pump device is fitted on the impeller shaft and held in a radially compressed state . The fluid pump device according to claim 1 ,
The fluid pump device according to claim 1, wherein the elastic member is an elastic ring member having a circular cross section, and the thick portion is a cross-sectional thick portion having a cross-sectional diameter increased. The fluid pump device according to claim 1 ,
The elastic member is a substantially cylindrical elastic cylindrical member having a plurality of protruding portions in the circumferential direction on an outer periphery thereof, and the thick portion is a protruding wall formed by enlarging a part of the protruding portion in the circumferential direction. A fluid pump device characterized by being a thick portion. A motor and an impeller member are accommodated in the motor case, the driving force of the motor is transmitted to the impeller member in a non-contact manner, and the impeller member rotates in the pump chamber formed in the motor case. In the fluid pump device in which the fluid drawn into the pump chamber is discharged to the outside through an outlet formed in a part in the circumferential direction of the pump chamber.
The impeller member is float supported with respect to the motor case by an impeller shaft that rotatably supports the impeller member being fixed to the motor case via an elastic member,
The motor case is formed with a holding portion whose inner peripheral surface is substantially circular,
The impeller shaft is formed in a substantially cylindrical shape,
The elastic member is formed in an annular shape having a uniform shape in the circumferential direction, is fitted into the holding portion and is fitted onto the impeller shaft and held in a radially compressed state,
A fluid pump device, wherein a radially extending convex portion is formed on at least one of the inner peripheral surface of the holding portion and the outer peripheral surface of the impeller shaft in the radial direction.

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