Series axial flow fan and series axial flow fan frame set thereof

Abstract

The utility model provides a kind of tandem axial flow fan and its tandem axial flow fan frame group, tandem axial flow fan includes a front fan and a rear fan.The front fan includes a front fan frame and a front rotor pivotally arranged in the front fan frame.The rear fan includes a rear fan frame and a rear rotor pivotally arranged in the front fan frame.The front fan frame and the rear fan frame are stacked and configured, the front rotor and the rear rotor are coaxially configured along a pivot axis, a plurality of front vanes are provided in the front fan frame, the front vanes are configured around the pivot axis of the front rotor, a plurality of rear vanes are provided in the rear fan frame, the rear vanes are configured around the pivot axis of the rear rotor, and the number of front vanes is different from the number of rear vanes.Therefore, the tandem axial flow fan and its tandem axial flow fan frame group of the utility model can improve the overall efficiency of the tandem axial flow fan, enhance the overall characteristics of the tandem axial flow fan and improve the static pressure efficiency of the fan.

Description

Technical Field

[0001] This disclosure relates to a series axial flow fan, and more particularly to a series axial flow fan with a discontinuous flow channel structure and a series axial flow fan frame assembly thereof. Background Technology

[0002] A series-connected axial fans combine multiple axial fans in series to increase output. In modern series-connected axial fans, the front and rear fans generally have the same flow field boundary structure. However, the front fan is typically designed to draw in stationary ambient air, and the flow field structure changes after the airflow passes through it. When the rear fan draws in air exhausted by the front fan, it delivers air through a similar flow field boundary structure, but due to the different inlet conditions, it cannot achieve the same expected performance as the front fan. Therefore, more turbulence and momentum loss are easily generated in the rear fan's flow field. This leads to differences in the upstream and downstream velocity and pressure fields, causing flow field instability and reducing fan efficiency.

[0003] In view of this, the creator has devoted himself to studying the aforementioned existing technologies and applying theoretical principles to try his best to solve the above-mentioned problems, which has become the creator's goal for improvement. Utility Model Content

[0004] This disclosure provides a series axial flow fan with a discontinuous flow channel structure and a series axial flow fan frame assembly thereof.

[0005] This disclosure provides a series axial flow fan, comprising a front fan and a rear fan. The front fan includes a front fan frame and a front rotor pivotally mounted on the front fan frame, with a plurality of front stator vanes disposed within the front fan frame. The rear fan includes a rear fan frame and a rear rotor pivotally mounted on the front fan frame, with a plurality of rear stator vanes disposed within the rear fan frame. The front and rear fan frames are stacked, and the front and rear rotors are coaxially arranged along the same pivot axis. The front stator vanes are arranged around the pivot axis of the front rotor, and the rear stator vanes are arranged around the pivot axis of the rear rotor, with the number of front stator vanes differing from the number of rear stator vanes.

[0006] This disclosure also provides a series-connected axial fan frame assembly, comprising a front fan frame and a rear fan frame. The front fan frame includes a plurality of front stator vanes, which are arranged around the central axis of the front fan frame at its inner edge. The rear fan frame includes a plurality of rear stator vanes, which are arranged around the central axis of the rear fan frame at its inner edge. The front and rear fan frames are stacked and coaxially connected in series, and the number of front stator vanes differs from the number of rear stator vanes.

[0007] In one embodiment of this disclosure, the number of front and rear stationary vanes is at least 2 and at most 30.

[0008] In one embodiment of this disclosure, the number of front or rear stationary vanes is at least 2 and at most 15.

[0009] In one embodiment of this disclosure, the number of front stationary vanes and the number of rear stationary vanes are integer multiples of each other.

[0010] In one embodiment of this disclosure, the number of both the front and rear stationary vanes is an odd number.

[0011] In one embodiment of this disclosure, the number of front stationary vanes is greater than the number of rear stationary vanes.

[0012] In one embodiment of this disclosure, the front stationary blades are defined with a plurality of front air ducts, and one of the front air ducts is defined between any two adjacent front stationary blades. The rear stationary blades are defined with a plurality of rear air ducts, and one of the rear air ducts is defined between any two adjacent rear stationary blades. The front air ducts are respectively connected to the rear air ducts.

[0013] In one embodiment of this disclosure, an airflow direction is defined from the front fan frame to the rear fan frame, and each front air duct and the connected rear air duct are not aligned along the airflow direction.

[0014] In one embodiment of this disclosure, an axial direction is defined along a central axis, and at least one of the front stator vanes is axially aligned with one of the rear stator vanes.

[0015] In one embodiment of this disclosure, an axial direction is defined along the pivot axis, and at least one of the front stator vanes is axially aligned with one of the rear stator vanes.

[0016] In one embodiment of this disclosure, the device includes: a front fan frame comprising a plurality of front stator blades arranged around the central axis of the front fan frame on the inner edge of the front fan frame; and a rear fan frame comprising a plurality of rear stator blades arranged around the central axis of the rear fan frame on the inner edge of the rear fan frame, wherein the front fan frame and the rear fan frame are stacked and coaxially connected in series, and the number of front stator blades is different from the number of rear stator blades.

[0017] In one embodiment of this disclosure, the number of the plurality of front stationary vanes and the plurality of rear stationary vanes is at least 2 and at most 30.

[0018] In one embodiment of this disclosure, the number of the plurality of front stationary blades or the plurality of rear stationary blades is at least 2 and at most 15.

[0019] In one embodiment of this disclosure, the number of the plurality of front stationary vanes and the number of the plurality of rear stationary vanes are integer multiples of each other.

[0020] In one embodiment of this disclosure, the number of both the plurality of front stationary vanes and the plurality of rear stationary vanes is an odd number.

[0021] In one embodiment of this disclosure, the number of the plurality of front stationary vanes is greater than the number of the plurality of rear stationary vanes.

[0022] In one embodiment of this disclosure, multiple front stator blades are defined with multiple front air ducts, and one of the front air ducts is defined between any two adjacent front stator blades. Multiple rear stator blades are defined with multiple rear air ducts, and one of the rear air ducts is defined between any two adjacent rear stator blades. The multiple front air ducts are respectively connected to the multiple rear air ducts.

[0023] In one embodiment of this disclosure, an airflow direction is defined from the front fan frame to the rear fan frame, and each front air duct and the connected rear air duct are not aligned along the airflow direction.

[0024] In one embodiment of this disclosure, an axial direction is defined along a central axis, and at least one of the front stator vanes is axially aligned with one of the rear stator vanes.

[0025] The front stator blades accelerate the airflow, and the rear stator blades further accelerate the airflow generated by the front stator blades, thereby improving the overall efficiency of the tandem axial fan. The misalignment of the front and rear air ducts reduces airflow turbulence and flow loss, thus enhancing the overall characteristics of the tandem axial fan. Compared to an aligned front and rear air duct configuration, the misalignment alters the pressure distribution upstream and downstream of the airflow, improving the fan's static pressure efficiency. Attached Figure Description

[0026] Figure 1 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the first embodiment of this disclosure;

[0027] Figure 2 This is a perspective view of the series-connected axial fan frame assembly of the first embodiment of the present disclosure.

[0028] Figure 3 This is an axial front view of the series axial flow fan frame assembly of the first embodiment of this disclosure on its front fan frame side;

[0029] Figure 4 This is an axial front view of the series axial flow fan frame assembly of the first embodiment of this disclosure on the rear fan frame side;

[0030] Figure 5 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the second embodiment of this disclosure;

[0031] Figure 6 This is a perspective view of the series-connected axial fan frame assembly of the second embodiment of the present disclosure;

[0032] Figure 7 This is an axial front view of the series axial flow fan frame assembly of the second embodiment of this disclosure on its front fan frame side;

[0033] Figure 8 This is an axial front view of the series axial flow fan frame assembly of the second embodiment of this disclosure on the rear fan frame side;

[0034] Figure 9 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the third embodiment of this disclosure;

[0035] Figure 10 This is a perspective view of the series-connected axial fan frame assembly of the third embodiment of the present disclosure.

[0036] Figure 11 This is an axial front view of the series axial flow fan frame assembly of the third embodiment of this disclosure on its front fan frame side;

[0037] Figure 12 This is an axial front view of the series axial flow fan frame assembly of the third embodiment of this disclosure on the rear fan frame side;

[0038] Figure 13 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the fourth embodiment of this disclosure;

[0039] Figure 14 This is a perspective view of the series-connected axial fan frame assembly of the fourth embodiment of the present disclosure.

[0040] Figure 15 This is an axial front view of the series axial flow fan frame assembly of the fourth embodiment of this disclosure on its front fan frame side;

[0041] Figure 16 This is an axial front view of the series axial flow fan frame assembly of the fourth embodiment of this disclosure on the rear fan frame side.

[0042] Explanation of reference numerals in the attached figures

[0043] 10: Front fan

[0044] 20: Rear Fan

[0045] 101: Front air duct

[0046] 102: Rear air duct

[0047] 110: Front panel frame

[0048] 111: Anterior still leaf

[0049] 1110: The Tenth Prelude - Shizuha

[0050] 1111: First pre-quiet leaf

[0051] 1112: Second pre-episthospital leaf

[0052] 1113: Third pre-quiet leaf

[0053] 1114: Fourth Pre-Still Leaf

[0054] 1115: Fifth Prelude to Still Leaf

[0055] 1116: Sixth Prelude to Shizuha

[0056] 1117: Seventh Shizuha

[0057] 1118: The Eighth Shizuha

[0058] 1119: The Ninth Shizuha

[0059] 112: Anterior circumference

[0060] 113: Front axle mount

[0061] 120: Rear Sector Frame

[0062] 121: Hou Jingye

[0063] 1210: The Tenth After Shizue

[0064] 1211: First Quiet Leaf

[0065] 1212: Second post-quiet leaf

[0066] 1213: Third Quiet Leaf

[0067] 1214: Fourth Quiet Leaf

[0068] 1215: Fifth Quiet Leaf

[0069] 1216: Sixth After Quiet Leaf

[0070] 1217: Seventh After Quiet Leaf

[0071] 1218: The Eighth After Quiet Leaf

[0072] 1219: The Ninth Night After Quiet Leaf

[0073] 122: Rear circumference

[0074] 123: Rear axle mount

[0075] 210: Front rotor

[0076] 220: Rear Rotor

[0077] A: Central axis

[0078] F: Airflow direction Detailed Implementation

[0079] In the description of this disclosure, it should be understood that the terms "front side", "rear side", "left side", "right side", "front end", "rear end", "end", "longitudinal", "lateral", "vertical", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0080] The detailed description and technical content of this disclosure will be explained below in conjunction with the accompanying drawings. However, the accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure.

[0081] First Embodiment

[0082] Figure 1 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the first embodiment of this disclosure. (See also...) Figure 1 The first embodiment of this disclosure provides a series axial flow fan, which includes a front fan 10 and a rear fan 20.

[0083] The front fan 10 includes a front fan frame 110 and a front rotor 210. A plurality of front stator vanes 111 are disposed within the front fan frame 110. The front fan frame 110 includes a front annular wall 112, a front axle housing 113, and the plurality of front stator vanes 111. The front axle housing 113 is housed within the front annular wall 112, positioned at the center of the front annular wall 112 and spaced apart from it. The front stator vanes 111 are respectively connected between the front annular wall 112 and the front axle housing 113. The front rotor 210 is pivotally mounted on and housed within the front fan frame 110 and is rotatable along a pivot axis. Specifically, the front rotor 210 is pivotally mounted on the front axle housing 113 and housed within the front annular wall 112, and the front stator vanes 111 are arranged around the pivot axis of the front rotor 210.

[0084] The rear fan 20 includes a rear fan frame 120 and a rear rotor 220. A plurality of rear stator vanes 121 are disposed within the rear fan frame 120. The rear fan frame 120 includes a rear annular wall 122, a rear axle seat 123, and the plurality of rear stator vanes 121. The rear axle seat 123 is housed within the rear annular wall 122, positioned at the center of the rear annular wall 122 and spaced apart from it. The rear stator vanes 121 are respectively connected between the rear annular wall 122 and the rear axle seat 123. The rear rotor 220 is pivotally mounted on and housed within the rear fan frame 120 and is rotatable along a pivot axis. Specifically, the rear rotor 220 is pivotally mounted on the rear axle seat 123 and housed within the rear annular wall 122, and the rear stator vanes 121 are arranged around the pivot axis of the rear rotor 220.

[0085] Figure 2 This is a perspective view of the series-connected axial fan frame assembly of the first embodiment of the present disclosure. (See also...) Figure 1 and Figure 2 The front fan frame 110 and the rear fan frame 120 are stacked, and the pivot axes of the front rotor 210 and the rear rotor 220 are aligned. The number of front stator vanes 111 differs from the number of rear stator vanes 121. Specifically, the front annular wall 112 and the rear annular wall 122 are stacked, and their central axes A are aligned. An axial direction is defined along this common central axis A, parallel to the Z-axis of the Cartesian coordinate system shown in the figure. The pivot axes of the front rotor 210 and the rear rotor 220 are aligned on central axis A.

[0086] In this embodiment, the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 30. Specifically, at least one of the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 15.

[0087] Figure 3 This is an axial front view of the series-connected axial flow fan frame assembly according to the first embodiment of this disclosure on the side of its front fan frame 110. (See also...) Figure 3 Specifically, the front stator blades 111 include a first front stator blade 1111, a second front stator blade 1112, a third front stator blade 1113, a fourth front stator blade 1114, a fifth front stator blade 1115, a sixth front stator blade 1116, a seventh front stator blade 1117, an eighth front stator blade 1118, and a ninth front stator blade 1119. These front stator blades 111 define multiple front air ducts 101. Specifically, the front stator blades 111 are arranged in a ring at equal angular intervals, thereby defining one front air duct 101 between any two adjacent front stator blades 111.

[0088] Figure 4 This is an axial front view of the tandem axial flow fan frame assembly according to the first embodiment of this disclosure on the rear fan frame 120 side. (See also...) Figure 4 Specifically, the rear stationary blades 121 include a first rear stationary blade 1211, a second rear stationary blade 1212, a third rear stationary blade 1213, a fourth rear stationary blade 1214, and a fifth rear stationary blade 1215. These rear stationary blades 121 define multiple rear air ducts 102. Specifically, the rear stationary blades 121 are arranged in a ring at equal angular intervals, thereby defining one rear air duct 102 between any two adjacent rear stationary blades 121.

[0089] See Figure 1 and Figure 2At least one of the front stator vanes 111 is axially aligned with one of the rear stator vanes 121. An airflow direction F is defined from the front fan frame 110 to the rear fan frame 120, which is the Z direction of the Cartesian coordinate system shown in the figure. The rear air ducts 102 are connected to the front air ducts 101 along the airflow direction F.

[0090] See Figures 2 to 4 Specifically, in this embodiment, the first front stationary blade 1111 is aligned with the second rear stationary blade 1212, while the remaining front stationary blades 111 and rear stationary blades 121 are misaligned along the axial direction. In this embodiment, the number of front stationary blades 111 is greater than the number of rear stationary blades 121, and both the number of front stationary blades 111 and the number of rear stationary blades 121 are odd, thus constituting an axial misalignment of the front stationary blades 111 and rear stationary blades 121. Therefore, each front air duct 101 and the connected rear air duct 102 are misaligned along the airflow direction F.

[0091] The front stator vane 111 accelerates the airflow, and the rear stator vane 121 further accelerates the airflow generated by the front stator vane 111, thereby improving the overall efficiency of the series axial fan. The misaligned configuration of the front duct 101 and the rear duct 102 reduces airflow turbulence and flow loss, thus improving the overall characteristics of the series axial fan. Compared to an aligned configuration of the front duct 101 and the rear duct 102, the misaligned configuration changes the pressure distribution upstream and downstream of the airflow direction F, thereby improving the fan's static pressure efficiency.

[0092] Second Embodiment

[0093] Figure 5 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the second embodiment of this disclosure. (See also...) Figure 5 The second embodiment of this disclosure provides a series axial flow fan, which includes a front fan 10 and a rear fan 20.

[0094] The front fan 10 includes a front fan frame 110 and a front rotor 210. A plurality of front stator vanes 111 are disposed within the front fan frame 110. The front fan frame 110 includes a front annular wall 112, a front axle housing 113, and the plurality of front stator vanes 111. The front axle housing 113 is housed within the front annular wall 112, positioned at the center of the front annular wall 112 and spaced apart from it. The front stator vanes 111 are respectively connected between the front annular wall 112 and the front axle housing 113. The front rotor 210 is pivotally mounted on and housed within the front fan frame 110 and is rotatable along a pivot axis. Specifically, the front rotor 210 is pivotally mounted on the front axle housing 113 and housed within the front annular wall 112, and the front stator vanes 111 are arranged around the pivot axis of the front rotor 210.

[0095] The rear fan 20 includes a rear fan frame 120 and a rear rotor 220. A plurality of rear stator vanes 121 are disposed within the rear fan frame 120. The rear fan frame 120 includes a rear annular wall 122, a rear axle seat 123, and the plurality of rear stator vanes 121. The rear axle seat 123 is housed within the rear annular wall 122, positioned at the center of the rear annular wall 122 and spaced apart from it. The rear stator vanes 121 are respectively connected between the rear annular wall 122 and the rear axle seat 123. The rear rotor 220 is pivotally mounted on and housed within the rear fan frame 120 and is rotatable along a pivot axis. Specifically, the rear rotor 220 is pivotally mounted on the rear axle seat 123 and housed within the rear annular wall 122, and the rear stator vanes 121 are arranged around the pivot axis of the rear rotor 220.

[0096] Figure 6 This is a perspective view of the series-connected axial fan frame assembly of the second embodiment of the present disclosure. (See also...) Figure 5 and Figure 6 The front fan frame 110 and the rear fan frame 120 are stacked, and the pivot axes of the front rotor 210 and the rear rotor 220 are aligned. The number of front stator vanes 111 differs from the number of rear stator vanes 121. Specifically, the front annular wall 112 and the rear annular wall 122 are stacked, and their central axes A are aligned. An axial direction is defined along this common central axis A, parallel to the Z-axis of the Cartesian coordinate system shown in the figure. The pivot axes of the front rotor 210 and the rear rotor 220 are aligned on central axis A.

[0097] In this embodiment, the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 30. Specifically, at least one of the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 15.

[0098] Figure 7 This is an axial front view of the tandem axial flow fan frame assembly of the second embodiment of this disclosure on the side of its front fan frame 110. (See also...) Figure 7 Specifically, the front stator blades 111 include a first front stator blade 1111, a second front stator blade 1112, a third front stator blade 1113, a fourth front stator blade 1114, a fifth front stator blade 1115, a sixth front stator blade 1116, a seventh front stator blade 1117, an eighth front stator blade 1118, a ninth front stator blade 1119, and a tenth front stator blade 1110. These front stator blades 111 define multiple front air ducts 101. Specifically, the front stator blades 111 are arranged in a ring at equal angular intervals, thereby defining one front air duct 101 between any two adjacent front stator blades 111.

[0099] Figure 8 This is an axial front view of the tandem axial flow fan frame assembly according to the second embodiment of this disclosure on the rear fan frame 120 side. (See also...) Figure 8 Specifically, the rear stationary blades 121 include a first rear stationary blade 1211, a second rear stationary blade 1212, a third rear stationary blade 1213, a fourth rear stationary blade 1214, and a fifth rear stationary blade 1215. These rear stationary blades 121 define multiple rear air ducts 102. Specifically, the rear stationary blades 121 are arranged in a ring at equal angular intervals, thereby defining one rear air duct 102 between any two adjacent rear stationary blades 121.

[0100] See Figure 5 and Figure 6 At least one of the front stator vanes 111 is axially aligned with one of the rear stator vanes 121. An airflow direction F is defined from the front fan frame 110 to the rear fan frame 120, which is the Z direction of the Cartesian coordinate system shown in the figure. The rear air ducts 102 are connected to the front air ducts 101 along the airflow direction F.

[0101] See Figures 6 to 8 Specifically, in this embodiment, the first front stator 1111 is aligned with the first rear stator 1211, the third front stator 1113 is aligned with the second rear stator 1212, the fifth front stator 1115 is aligned with the third rear stator 1213, the seventh front stator 1117 is aligned with the fourth rear stator 1214, and the ninth front stator 1119 is aligned with the fifth rear stator 1215. The remaining front stator 111 and rear stator 121 are misaligned along the axial direction. In this embodiment, the number of front stator 111 is greater than the number of rear stator 121, and the number of front stator 111 and the number of rear stator 121 are integer multiples of each other. For example, in this embodiment, the number of front stator 111 is twice the number of rear stator 121. This results in all the front stator 111 being aligned with the lowered portion of the rear stator 121, and the front air duct 101 and the rear air duct 102 are simultaneously misaligned.

[0102] The front stator vane 111 accelerates the airflow, and the rear stator vane 121 further accelerates the airflow generated by the front stator vane 111, thereby improving the overall efficiency of the series axial fan. The misaligned configuration of the front duct 101 and the rear duct 102 reduces airflow turbulence and flow loss, thus improving the overall characteristics of the series axial fan. Compared to an aligned configuration of the front duct 101 and the rear duct 102, the misaligned configuration changes the pressure distribution upstream and downstream of the airflow direction F, thereby improving the fan's static pressure efficiency.

[0103] Third Embodiment

[0104] Figure 9 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the third embodiment of this disclosure. (See also...) Figure 9 The third embodiment of this disclosure provides a series axial flow fan, which includes a front fan 10 and a rear fan 20.

[0105] The front fan 10 includes a front fan frame 110 and a front rotor 210. A plurality of front stator vanes 111 are disposed within the front fan frame 110. The front fan frame 110 includes a front annular wall 112, a front axle housing 113, and the plurality of front stator vanes 111. The front axle housing 113 is housed within the front annular wall 112, positioned at the center of the front annular wall 112 and spaced apart from it. The front stator vanes 111 are respectively connected between the front annular wall 112 and the front axle housing 113. The front rotor 210 is pivotally mounted on and housed within the front fan frame 110 and is rotatable along a pivot axis. Specifically, the front rotor 210 is pivotally mounted on the front axle housing 113 and housed within the front annular wall 112, and the front stator vanes 111 are arranged around the pivot axis of the front rotor 210.

[0106] The rear fan 20 includes a rear fan frame 120 and a rear rotor 220. A plurality of rear stator vanes 121 are disposed within the rear fan frame 120. The rear fan frame 120 includes a rear annular wall 122, a rear axle seat 123, and the plurality of rear stator vanes 121. The rear axle seat 123 is housed within the rear annular wall 122, positioned at the center of the rear annular wall 122 and spaced apart from it. The rear stator vanes 121 are respectively connected between the rear annular wall 122 and the rear axle seat 123. The rear rotor 220 is pivotally mounted on and housed within the rear fan frame 120 and is rotatable along a pivot axis. Specifically, the rear rotor 220 is pivotally mounted on the rear axle seat 123 and housed within the rear annular wall 122, and the rear stator vanes 121 are arranged around the pivot axis of the rear rotor 220.

[0107] Figure 10 This is a perspective view of the series-connected axial fan frame assembly of a third embodiment of the present disclosure. (See also...) Figure 9 and Figure 10 The front fan frame 110 and the rear fan frame 120 are stacked, and the pivot axes of the front rotor 210 and the rear rotor 220 are aligned. The number of front stator vanes 111 differs from the number of rear stator vanes 121. Specifically, the front annular wall 112 and the rear annular wall 122 are stacked, and their central axes A are aligned. An axial direction is defined along this common central axis A, parallel to the Z-axis of the Cartesian coordinate system shown in the figure. The pivot axes of the front rotor 210 and the rear rotor 220 are aligned on central axis A.

[0108] In this embodiment, the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 30. Specifically, at least one of the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 15.

[0109] Figure 11This is an axial front view of the tandem axial flow fan frame assembly according to the third embodiment of this disclosure on the side of its front fan frame 110. (See also...) Figure 11 Specifically, the front stator blades 111 include a first front stator blade 1111, a second front stator blade 1112, a third front stator blade 1113, a fourth front stator blade 1114, and a fifth front stator blade 1115. These front stator blades 111 define multiple front air ducts 101. Specifically, the front stator blades 111 are arranged in a ring at equal angular intervals, thereby defining one front air duct 101 between any two adjacent front stator blades 111.

[0110] Figure 12 This is an axial front view of the tandem axial flow fan frame assembly according to the third embodiment of this disclosure on the rear fan frame 120 side. (See also...) Figure 12 Specifically, the rear stationary blades 121 include a first rear stationary blade 1211, a second rear stationary blade 1212, a third rear stationary blade 1213, a fourth rear stationary blade 1214, a fifth rear stationary blade 1215, a sixth rear stationary blade 1216, and a seventh rear stationary blade 1217. These rear stationary blades 121 define multiple rear air ducts 102. Specifically, the rear stationary blades 121 are arranged in a ring at equal angular intervals, thereby defining one rear air duct 102 between any two adjacent rear stationary blades 121.

[0111] See Figure 9 and Figure 10 At least one of the front stator vanes 111 is axially aligned with one of the rear stator vanes 121. An airflow direction F is defined from the front fan frame 110 to the rear fan frame 120, which is the Z direction of the Cartesian coordinate system shown in the figure. The rear air ducts 102 are connected to the front air ducts 101 along the airflow direction F.

[0112] See Figures 10 to 12 Specifically, in this embodiment, the first front stationary vane 1111 is aligned with the first rear stationary vane 1211, while the remaining front stationary vanes 111 and rear stationary vanes 121 are misaligned along the axial direction. In this embodiment, the number of rear stationary vanes 121 is greater than the number of front stationary vanes 111, and both the number of front stationary vanes 111 and the number of rear stationary vanes 121 are odd, thus constituting an axial misalignment of the front stationary vanes 111 and rear stationary vanes 121. Therefore, each front air duct 101 and the connected rear air duct 102 are misaligned along the airflow direction F.

[0113] The front stator vane 111 accelerates the airflow, and the rear stator vane 121 further accelerates the airflow generated by the front stator vane 111, thereby improving the overall efficiency of the series axial fan. The misaligned configuration of the front duct 101 and the rear duct 102 reduces airflow turbulence and flow loss, thus improving the overall characteristics of the series axial fan. Compared to an aligned configuration of the front duct 101 and the rear duct 102, the misaligned configuration changes the pressure distribution upstream and downstream of the airflow direction F, thereby improving the fan's static pressure efficiency.

[0114] Fourth embodiment

[0115] Figure 13 This is an exploded perspective view of the series-connected axial fan and series-connected axial fan frame assembly according to the fourth embodiment of this disclosure. (See also...) Figure 13 The fourth embodiment of this disclosure provides a series axial flow fan, which includes a front fan 10 and a rear fan 20.

[0116] The front fan 10 includes a front fan frame 110 and a front rotor 210. A plurality of front stator vanes 111 are disposed within the front fan frame 110. The front fan frame 110 includes a front annular wall 112, a front axle housing 113, and the plurality of front stator vanes 111. The front axle housing 113 is housed within the front annular wall 112, positioned at the center of the front annular wall 112 and spaced apart from it. The front stator vanes 111 are respectively connected between the front annular wall 112 and the front axle housing 113. The front rotor 210 is pivotally mounted on and housed within the front fan frame 110 and is rotatable along a pivot axis. Specifically, the front rotor 210 is pivotally mounted on the front axle housing 113 and housed within the front annular wall 112, and the front stator vanes 111 are arranged around the pivot axis of the front rotor 210.

[0117] The rear fan 20 includes a rear fan frame 120 and a rear rotor 220. A plurality of rear stator vanes 121 are disposed within the rear fan frame 120. The rear fan frame 120 includes a rear annular wall 122, a rear axle seat 123, and the plurality of rear stator vanes 121. The rear axle seat 123 is housed within the rear annular wall 122, positioned at the center of the rear annular wall 122 and spaced apart from it. The rear stator vanes 121 are respectively connected between the rear annular wall 122 and the rear axle seat 123. The rear rotor 220 is pivotally mounted on and housed within the rear fan frame 120 and is rotatable along a pivot axis. Specifically, the rear rotor 220 is pivotally mounted on the rear axle seat 123 and housed within the rear annular wall 122, and the rear stator vanes 121 are arranged around the pivot axis of the rear rotor 220.

[0118] Figure 14 This is a perspective view of the series-connected axial fan frame assembly of the fourth embodiment of the present disclosure. (See also...) Figure 13 and Figure 14 The front fan frame 110 and the rear fan frame 120 are stacked, and the pivot axes of the front rotor 210 and the rear rotor 220 are aligned. The number of front stator vanes 111 differs from the number of rear stator vanes 121. Specifically, the front annular wall 112 and the rear annular wall 122 are stacked, and their central axes A are aligned. An axial direction is defined along this common central axis A, parallel to the Z-axis of the Cartesian coordinate system shown in the figure. The pivot axes of the front rotor 210 and the rear rotor 220 are aligned on central axis A.

[0119] In this embodiment, the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 30. Specifically, at least one of the number of the front stationary blades 111 and the number of the rear stationary blades 121 is at least 2 and at most 15.

[0120] Figure 15 This is an axial front view of the tandem axial flow fan frame assembly according to the fourth embodiment of this disclosure on the side of its front fan frame 110. (See also...) Figure 15 Specifically, the front stator blades 111 include a first front stator blade 1111, a second front stator blade 1112, a third front stator blade 1113, a fourth front stator blade 1114, and a fifth front stator blade 1115. These front stator blades 111 define multiple front air ducts 101. Specifically, the front stator blades 111 are arranged in a ring at equal angular intervals, thereby defining one front air duct 101 between any two adjacent front stator blades 111.

[0121] Figure 16 This is an axial front view of the tandem axial flow fan frame assembly according to the fourth embodiment of this disclosure on the rear fan frame 120 side. (See also...) Figure 16 Specifically, the rear stationary blades 121 include a first rear stationary blade 1211, a second rear stationary blade 1212, a third rear stationary blade 1213, a fourth rear stationary blade 1214, a fifth rear stationary blade 1215, a sixth rear stationary blade 1216, a seventh rear stationary blade 1217, an eighth rear stationary blade 1218, a ninth rear stationary blade 1219, and a tenth rear stationary blade 1210. These rear stationary blades 121 define multiple rear air ducts 102. Specifically, the rear stationary blades 121 are arranged in a ring at equal angular intervals, thereby defining one rear air duct 102 between any two adjacent rear stationary blades 121.

[0122] See Figure 13 and Figure 14 At least one of the front stator vanes 111 is axially aligned with one of the rear stator vanes 121. An airflow direction F is defined from the front fan frame 110 to the rear fan frame 120, which is the Z direction of the Cartesian coordinate system shown in the figure. The rear air ducts 102 are connected to the front air ducts 101 along the airflow direction F.

[0123] See Figures 14 to 16Specifically, in this embodiment, the first front stator 1111 is aligned with the first rear stator 1211, the second front stator 1112 is aligned with the third rear stator 1213, the third front stator 1113 is aligned with the fifth rear stator 1215, the fourth front stator 1114 is aligned with the seventh rear stator 1217, the fifth front stator 1115 is aligned with the ninth rear stator 1219, and the remaining front stator 111 and rear stator 121 are misaligned along the axial direction. In this embodiment, the number of rear stator 121 is greater than the number of front stator 111, and the number of front stator 111 and the number of rear stator 121 are integer multiples of each other. For example, in this embodiment, the number of front stator 111 is twice the number of rear stator 121. This results in all the front stator 111 being aligned with the lowered portion of the rear stator 121, and the front air duct 101 and the rear air duct 102 are simultaneously misaligned.

[0124] The front stator vane 111 accelerates the airflow, and the rear stator vane 121 further accelerates the airflow generated by the front stator vane 111, thereby improving the overall efficiency of the series axial fan. The misaligned configuration of the front duct 101 and the rear duct 102 reduces airflow turbulence and flow loss, thus improving the overall characteristics of the series axial fan. Compared to an aligned configuration of the front duct 101 and the rear duct 102, the misaligned configuration changes the pressure distribution upstream and downstream of the airflow direction F, thereby improving the fan's static pressure efficiency.

[0125] The above description is only a preferred embodiment of the present utility model and is not intended to limit the claims of the present utility model. Other equivalent changes that utilize the patent spirit of the present utility model should all be included in the claims of the present utility model.

Claims

1. A series axial flow fan, characterized in that, include: A front fan includes a front fan frame and a front rotor pivotally mounted on the front fan frame, wherein a plurality of front stator vanes are disposed within the front fan frame; and The rear fan includes a rear fan frame and a rear rotor pivotally mounted on the front fan frame. Multiple rear stator vanes are disposed within the rear fan frame. The front fan frame and the rear fan frame are stacked together, the front rotor and the rear rotor are coaxially arranged along the same pivot axis, the plurality of front stationary vanes are arranged around the pivot axis of the front rotor, the plurality of rear stationary vanes are arranged around the pivot axis of the rear rotor, and the number of the front stationary vanes is different from the number of the rear stationary vanes.

2. The series axial flow fan according to claim 1, characterized in that, The number of the plurality of front stationary blades and the plurality of rear stationary blades are at least 2 and at most 30.

3. The series axial flow fan according to claim 2, characterized in that, The number of the plurality of front stationary blades or the plurality of rear stationary blades is at least 2 and at most 15.

4. The series axial flow fan according to claim 1, characterized in that, The number of the plurality of front stationary blades and the number of the plurality of rear stationary blades are in an integer multiple relationship.

5. The series axial flow fan according to claim 1, characterized in that, The number of both the plurality of anterior stationary blades and the plurality of posterior stationary blades is an odd number.

6. The series axial flow fan according to claim 1, characterized in that, The number of the plurality of front stationary blades is greater than the number of the plurality of rear stationary blades.

7. The series axial flow fan according to claim 1, characterized in that, The plurality of front stator blades define a plurality of front air ducts, and one of the front air ducts is defined between any two adjacent front stator blades. The plurality of rear stator blades define a plurality of rear air ducts, and one of the rear air ducts is defined between any two adjacent rear stator blades. The plurality of front air ducts are respectively connected to the plurality of rear air ducts.

8. The series axial flow fan according to claim 7, characterized in that, An airflow direction is defined from the front fan frame to the rear fan frame, and each of the front air ducts and the connected rear air ducts are not aligned along the airflow direction.

9. The series axial flow fan according to claim 1, characterized in that, An axial direction is defined along the pivot axis, and at least one of the front stationary vanes is aligned with one of the rear stationary vanes in the axial direction.

10. A series-connected axial flow fan frame assembly, characterized in that, include: A front fan frame includes a plurality of front stationary vanes, the plurality of front stationary vanes being arranged around the central axis of the front fan frame on the inner edge of the front fan frame; and The rear fan frame includes multiple rear stator vanes, which are arranged around the central axis of the rear fan frame on its inner edge. The front fan frame and the rear fan frame are stacked and coaxially connected in series, and the number of the front stationary blades is different from the number of the rear stationary blades.

11. The series-connected axial flow fan frame assembly according to claim 10, characterized in that, The number of the plurality of front stationary blades and the plurality of rear stationary blades are at least 2 and at most 30.

12. The series-connected axial flow fan frame assembly according to claim 11, characterized in that, The number of the plurality of front stationary blades or the plurality of rear stationary blades is at least 2 and at most 15.

13. The series-connected axial flow fan frame assembly according to claim 10, characterized in that, The number of the plurality of front stationary blades and the number of the plurality of rear stationary blades are in an integer multiple relationship.

14. The series-connected axial flow fan frame assembly according to claim 10, characterized in that, The number of both the plurality of anterior stationary blades and the plurality of posterior stationary blades is an odd number.

15. The series-connected axial flow fan frame assembly according to claim 10, characterized in that, The number of the plurality of front stationary blades is greater than the number of the plurality of rear stationary blades.

16. The series-connected axial flow fan frame assembly according to claim 10, characterized in that, The plurality of front stator blades define a plurality of front air ducts, and one of the front air ducts is defined between any two adjacent front stator blades. The plurality of rear stator blades define a plurality of rear air ducts, and one of the rear air ducts is defined between any two adjacent rear stator blades. The plurality of front air ducts are respectively connected to the plurality of rear air ducts.

17. The series-connected axial flow fan frame assembly according to claim 16, characterized in that, An airflow direction is defined from the front fan frame to the rear fan frame, and each of the front air ducts and the connected rear air ducts are not aligned along the airflow direction.

18. The series-connected axial flow fan frame assembly according to claim 10, characterized in that, An axial direction is defined along the central axis, and at least one of the front stator vanes is aligned with one of the rear stator vanes in the axial direction.

Images