IP Library › Granted Patent US 12704129
Granted Patent B2
US 12704129 · App. 18/712,941 · Granted Aug 11, 2026

Fan assembly

Inventors: Yuwei Wang (Suzhou, CN); De Wei (Suzhou, CN)
Assignee: Illinois Tool Works Inc.
F04D29/281B23K1/008F04D25/02F27B9/3005F27D7/04F27D2007/045
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Quick Facts
Patent No.
US 12704129
App. No.
18/712,941
Granted
Aug 11, 2026
Kind
B2
Abstract

The present application provides a fan assembly, this fan assembly is characterized by: a motor and an impeller, the motor having a motor body and a motor shaft extending from the motor body, a distal end of the motor shaft having a first positioning mark with a certain spacing from 5 a central axis of the motor shaft, the distal end of the motor shaft having an end surface, the first positioning mark being at least partially visible on the end surface, the impeller having an impeller center bore, and a second positioning mark being provided on the impeller, where when the motor shaft is inserted into the impeller center bore, and the central axis of the motor 10 shaft, the second positioning marker and the first positioning marker are on a same diameter of the fan assembly, the impeller is mounted in place in a radial direction relative to the motor so that the fan assembly reaches dynamic balance during operation. The impeller and the motor in the present application are detachable.

Claims (62)

1 . A fan assembly, comprising:

a motor having a motor body and a motor shaft extending from the motor body, a distal end of the motor shaft having a first positioning marker with a certain spacing from a central axis of the motor shaft, the distal end of the motor shaft having an end surface, the first positioning marker being at least partially visible on the end surface; and

an impeller having an impeller center bore, the impeller provided with a second positioning mark thereon;

wherein when the motor shaft is inserted into the impeller center bore, and the central axis of the motor shaft, the second positioning marker and the first positioning marker are on a same diameter of the fan assembly, the impeller is mounted in place in a radial direction relative to the motor so that the fan assembly reaches dynamic balance during operation, and

wherein a position of the impeller is adjustable in a radial direction relative to the motor and relative to the motor shaft.

2 . The fan assembly according to claim 1 , further comprising:

a sealing device comprising a graphite gasket, the sealing device being sleeved on the motor shaft and disposed between the impeller and the motor body to form sealing between the impeller and the motor body;

wherein the impeller is detachably connected to the motor so that the graphite gasket is replaceable, and the first positioning mark and the second positioning mark enable the impeller to be mounted in place in the radial direction relative to the motor when the impeller is remounted on the motor shaft.

3 . The fan assembly according to claim 2 , wherein:

the fan assembly is used for a reflow oven, the impeller is located inside a furnace of the reflow oven, the motor body is outside the furnace of the reflow oven, and the sealing device is configured to isolate the interior of the furnace from the exterior of the furnace.

4 . The fan assembly according to claim 1 , wherein:

the first positioning marker is a positioning recess recessed inwardly from the end surface.

5 . The fan assembly according to claim 1 , wherein:

the impeller has a mounting portion located in the center of the impeller, the impeller center bore runs through the mounting portion, the mounting portion has a proximal surface facing the motor body and a distal surface facing away from the motor body, and the second positioning marker is a positioning convex portion protruding from the distal surface.

6 . A reflow oven, comprising:

a furnace housing in which a furnace is formed; and

the fan assembly according to claim 1 , the fan assembly being disposed on the furnace housing, the impeller of the fan assembly being located inside the furnace of the reflow oven, and the motor body being located outside the furnace of the reflow oven.

7 . The reflow oven according to claim 6 , further comprising:

a sealing device comprising a graphite gasket, the sealing device being sleeved on the motor shaft and disposed between the impeller and the motor body to form sealing between the impeller and the motor body;

wherein the impeller is detachably connected to the motor so that the graphite gasket is replaceable, and the first positioning mark and the second positioning mark enable the impeller to be mounted in place in the radial direction relative to the motor when the impeller is remounted on the motor shaft.

8 . The reflow oven according to claim 7 , wherein:

the sealing device is configured to isolate the interior of the furnace from the exterior of the furnace.

9 . The reflow oven according to claim 7 , wherein:

the first positioning marker is a positioning recess recessed inwardly from the end surface.

10 . The reflow oven according to claim 6 , wherein:

the impeller has a mounting portion located in the center of the impeller, the impeller center bore runs through the mounting portion, the mounting portion has a proximal surface facing the motor body and a distal surface facing away from the motor body, and the second positioning marker is a positioning convex portion protruding from the distal surface.

11 . A fan assembly, comprising:

a motor having a motor body and a motor shaft extending from the motor body, a distal end of the motor shaft having a first positioning marker with a certain spacing from a central axis of the motor shaft, the distal end of the motor shaft having an end surface, the first positioning marker being at least partially visible on the end surface;

an impeller having an impeller center bore, the impeller provided with a second positioning mark thereon;

wherein when the motor shaft is inserted into the impeller center bore, and the central axis of the motor shaft, the second positioning marker and the first positioning marker are on a same diameter of the fan assembly, the impeller is mounted in place in a radial direction relative to the motor so that the fan assembly reaches dynamic balance during operation; and

a fastener assembly comprising a positioning gasket and a fastening bolt, wherein the positioning gasket comprises a gasket hole and a joint facing the impeller, the gasket hole of the positioning gasket is aligned with the impeller center bore, the joint of the positioning gasket abuts against the motor shaft, the positioning gasket is clamped between the mounting portion of the impeller and a head of the fastening bolt, and the fastening bolt passes through the gasket hole of the positioning gasket to securely connect to the motor shaft, so as to securely connect the impeller and the motor shaft;

wherein the positioning gasket has a stop opening that engages with a positioning convex portion to limit rotation of the positioning gasket and the motor shaft connected to the positioning gasket relative to the impeller.

12 . The fan assembly according to claim 11 , wherein:

the stop opening is a recess formed by inwardly recessing an outer edge of the positioning gasket.

13 . The fan assembly according to claim 11 , wherein:

the positioning gasket comprises a rear side facing the impeller, the rear side is provided with an annular convex portion disposed about the gasket hole, the annular convex portion forms the joint, and the annular convex portion is able to enter the impeller central bore for contact with the motor shaft.

14 . A fan assembly, comprising:

a motor having a motor body and a motor shaft extending from the motor body, a distal end of the motor shaft having a first positioning marker with a certain spacing from a central axis of the motor shaft, the distal end of the motor shaft having an end surface, the first positioning marker being at least partially visible on the end surface;

an impeller having an impeller center bore, the impeller provided with a second positioning mark thereon;

wherein when the motor shaft is inserted into the impeller center bore, and the central axis of the motor shaft, the second positioning marker and the first positioning marker are on a same diameter of the fan assembly, the impeller is mounted in place in a radial direction relative to the motor so that the fan assembly reaches dynamic balance during operation; and

wherein the impeller has a mounting portion located in the center of the impeller, the impeller center bore runs through the mounting portion, the mounting portion has a proximal surface facing the motor body and a distal surface facing away from the motor body, and the second positioning marker is a positioning convex portion protruding from the distal surface; and

the positioning convex portion is a positioning bolt mounted on the mounting portion of the impeller.

15 . A reflow oven, comprising:

a furnace housing in which a furnace is formed;

a fan assembly, comprising:

a motor having a motor body and a motor shaft extending from the motor body, a distal end of the motor shaft having a first positioning marker with a certain spacing from a central axis of the motor shaft, the distal end of the motor shaft having an end surface, the first positioning marker being at least partially visible on the end surface; and

an impeller having an impeller center bore, the impeller provided with a second positioning mark thereon, wherein when the motor shaft is inserted into the impeller center bore, and the central axis of the motor shaft, the second positioning marker and the first positioning marker are on a same diameter of the fan assembly, the impeller is mounted in place in a radial direction relative to the motor so that the fan assembly reaches dynamic balance during operation, wherein the fan assembly is disposed on the furnace housing, the impeller of the fan assembly being located inside the furnace of the reflow oven, and the motor body being located outside the furnace of the reflow oven;

a fastener assembly comprising a positioning gasket and a fastening bolt, wherein the positioning gasket comprises a gasket hole and a joint facing the impeller, the gasket hole of the positioning gasket is aligned with the impeller center bore, the joint of the positioning gasket abuts against the motor shaft, the positioning gasket is clamped between the mounting portion of the impeller and a head of the fastening bolt, and the fastening bolt passes through the gasket hole of the positioning gasket to securely connect to the motor shaft, so as to securely connect the impeller and the motor shaft; and

a sealing device comprising a graphite gasket, the sealing device being sleeved on the motor shaft and disposed between the impeller and the motor body to form sealing between the impeller and the motor body;

wherein the impeller is detachably connected to the motor so that the graphite gasket is replaceable, and the first positioning mark and the second positioning mark enable the impeller to be mounted in place in the radial direction relative to the motor when the impeller is remounted on the motor shaft, and

wherein the positioning gasket has a stop opening that engages with the positioning convex portion to limit rotation of the positioning gasket and the motor shaft connected to the positioning gasket relative to the impeller.

16 . The reflow oven according to claim 15 , wherein:

the stop opening is a recess formed by inwardly recessing an outer edge of the positioning gasket.

17 . The reflow oven according to claim 15 , wherein:

the positioning gasket comprises a rear side facing the impeller, the rear side is provided with an annular convex portion disposed about the gasket hole, the annular convex portion forms the joint, and the annular convex portion is able to enter the impeller central bore for contact with the motor shaft.

18 . A reflow oven, comprising:

a furnace housing in which a furnace is formed;

a fan assembly, comprising:

a motor having a motor body and a motor shaft extending from the motor body, a distal end of the motor shaft having a first positioning marker with a certain spacing from a central axis of the motor shaft, the distal end of the motor shaft having an end surface, the first positioning marker being at least partially visible on the end surface; and

an impeller having an impeller center bore, the impeller provided with a second positioning mark thereon, wherein when the motor shaft is inserted into the impeller center bore, and the central axis of the motor shaft, the second positioning marker and the first positioning marker are on a same diameter of the fan assembly, the impeller is mounted in place in a radial direction relative to the motor so that the fan assembly reaches dynamic balance during operation, wherein the fan assembly is disposed on the furnace housing, the impeller of the fan assembly being located inside the furnace of the reflow oven, and the motor body being located outside the furnace of the reflow oven,

wherein the impeller has a mounting portion located in the center of the impeller, the impeller center bore runs through the mounting portion, the mounting portion has a proximal surface facing the motor body and a distal surface facing away from the motor body, and the second positioning marker is a positioning convex portion protruding from the distal surface, and

wherein the positioning convex portion is a positioning bolt mounted on the mounting portion of the impeller.