CN210769417U

CN210769417U - Diagonal flow fan

Info

Publication number: CN210769417U
Application number: CN201921546630.3U
Authority: CN
Inventors: 林志良; 唐秀文
Original assignee: Foshan City Nanhai Jiuzhou Popula Fan Co Ltd
Current assignee: Foshan City Nanhai Jiuzhou Popula Fan Co Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-16
Anticipated expiration: 2029-09-17

Abstract

A diagonal flow fan comprising a casing and an impeller, the casing comprising a barrel: the cylinder body is arranged along the left-right direction, the left end and the right end of the cylinder body are respectively provided with an air inlet and an air outlet, and the cylinder body comprises a left half cylinder and a right half cylinder which are symmetrically arranged left and right; a motor barrel: the motor barrel is a circular truncated cone, the central axis of the motor barrel and the central axis of the barrel body are coaxially arranged, the motor barrel is fixedly connected to the inner side of the right half barrel, and the diameter of the left bottom edge of the motor barrel is larger than that of the right bottom edge of the motor barrel; a plurality of vanes: a plurality of the stator with the axis of motor jar as axis annular array connect in on the side of motor jar, the stator is the even lamellar body of wall thickness, first side is the part of the cylinder face that the internal diameter is R2, the generating line perpendicular to of first side the axis of motor jar. According to the contrast of experimental result, the utility model discloses can improve the total pressure of fan.

Description

Diagonal flow fan

Technical Field

The utility model relates to a fan field, especially a diagonal flow fan.

Background

The diagonal flow fan is widely applied to various places needing ventilation, such as markets, factories and the like, the diagonal flow fan generates air flow by means of an impeller, the impeller of the diagonal flow fan enables air to do centrifugal motion and axial motion in a casing, a guide vane is arranged in the casing, and rotation energy generated by the impeller to wind is converted into axial kinetic energy to improve the total pressure of the fan, so that the research on the shape of the casing of the diagonal flow fan is very important. The existing casing has larger interference to the air flow, the air flow has large loss on the casing, so that the total pressure is low, the power consumption is high, the use cost of a user is increased, and more in-depth researches and explorations are needed on the shape of the casing to achieve a better effect.

Further, the shape of the impeller and the shape of the casing have an important influence on the wind flow, and the matching degree between the shape of the impeller and the shape of the casing also has an important influence on the wind flow, so that it is important to study the impeller and the casing of the diagonal flow fan as a whole.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: provided is a diagonal flow fan capable of increasing the total pressure of the fan.

The utility model provides a solution of its technical problem is:

a diagonal flow fan comprising a casing and an impeller, the casing comprising:

a barrel body: the cylinder body is arranged along the left-right direction, the left end and the right end of the cylinder body are respectively provided with an air inlet and an air outlet, the cylinder body comprises a left half cylinder and a right half cylinder which are arranged in bilateral symmetry, the left half cylinder is a circular truncated cone, the diameter of the left bottom edge of the left half cylinder is smaller than that of the right bottom edge of the left half cylinder, the air inlet is formed in the left side of the left half cylinder, the diameter of the air inlet is D3, the length of the left half cylinder is L2, and the included angle between the bus of the left half cylinder and the central axis of the left half cylinder is a 3;

a motor barrel: the motor barrel is a circular truncated cone, the central axis of the motor barrel and the central axis of the barrel body are coaxially arranged, the motor barrel is fixedly connected to the inner side of the right half barrel, the diameter of the left bottom edge of the motor barrel is larger than that of the right bottom edge of the motor barrel, the diameter of the left bottom edge of the motor barrel is d2, the length of the motor barrel is L3, and the included angle between the bus of the motor barrel and the central axis of the motor barrel is a 4;

a plurality of vanes: the guide vanes are connected to the side face of the motor barrel in an annular array mode by taking the central axis of the motor barrel as an axis, the guide vanes are sheet bodies with uniform wall thickness, the front face and the back face of each guide vane are respectively a first side face and a second side face, the first side face is arranged on one side close to the bottom face with the smaller diameter on the motor barrel, the first side face is a part of a cylindrical surface with the inner diameter of R2, a bus of the first side face is perpendicular to the central axis of the motor barrel, the left side edge of the first side face and the right side edge of the first side face form an installation reference face, the included angle between the installation reference face and the central axis is a5, the arc length of each guide vane is L3, the edge, connected with the motor barrel, on each guide vane is called an inner side edge, and the edge, opposite to the motor barrel, on each guide vane;

the impeller is rotatably connected with the motor barrel, the central axis of the impeller is coaxial with the central axis of the motor barrel, and the impeller is arranged in the left half barrel.

As a further improvement of the above aspect, the impeller includes:

hub: the hub is a truncated cone, the central axis of the hub and the central axis of the motor barrel are coaxially arranged, the hub is arranged in the left half barrel, a driving shaft is fixedly connected to the hub, the driving shaft and the central axis of the hub are coaxially arranged, the hub is rotatably connected with the motor barrel through the driving shaft, the diameter of the right bottom edge of the hub is larger than that of the left bottom edge of the hub, the diameter of the right bottom edge of the hub is d, the height of the hub is L, and the included angle between the bus of the hub and the axis of the hub is a 1;

a plurality of blades: the blades are connected to the side face of the hub in an annular array mode by taking the central axis of the hub as an axis, the blades are sheet bodies with uniform wall thickness, the front face and the back face of each blade are respectively a positive pressure face and a negative pressure face, the positive pressure face is arranged on one side close to the bottom face with the larger diameter on the hub, the edge of the positive pressure face comprises a root edge, a front edge, a top edge and a rear edge which are sequentially connected, the root edge is connected with the side face of the hub, and the rear edge is arranged on one side close to the bottom face with the larger diameter on the hub; the positive pressure surface is a part of a cylindrical surface with the inner diameter of R, a forming axis is arranged on the positive pressure surface, and the forming axis is superposed with one cylindrical generatrix of the cylindrical surface; the surface formed by the motion trail of the top edge is called a top blade surface, the generatrix of the top blade surface is a straight line, the diameter of the round edge on the top blade surface close to the rear edge is D2, the diameter of the round edge on the top blade surface close to the front edge is D1, and D2 is larger than D1; a first reference surface is arranged on the blade, the central axis of the hub is in the first reference surface, the intersection point of the first reference surface and the root edge is called a reference starting point, and the intersection point of the first reference surface and the top edge is called a reference terminal point;

the blade is in a flat state: connecting the reference starting point and the reference terminal point to form a reference line, wherein a dividing point is arranged on the reference line, the reference line and the forming axis intersect at the dividing point, the clockwise rotation angle from the reference line to the forming axis by taking the dividing point as a vertex is a2, and a2 is less than 90 degrees; the intersection point of the root edge and the rear edge is called a first intersection point, the intersection point of the rear edge and the top edge is called a second intersection point, the intersection point of the top edge and the front edge is called a third intersection point, the intersection point of the front edge and the root edge is called a fourth intersection point, the distance from the boundary point to the reference starting point is H, the distance from the reference starting point to the fourth intersection point is F, the distance from the fourth intersection point to the first intersection point is A, the distance from the third intersection point to the fourth intersection point is B, the distance from the third intersection point to the reference terminal point is G, the distance from the third intersection point to the second intersection point is C, and the distance from the second intersection point to the first intersection point is E.

As a further improvement of the above solution, the diameters of the air inlet and the air outlet are the same.

As a further improvement of the scheme, the motor cylinder is provided with an outlet pipe with an elliptical section, and the long axis of the ellipse is arranged along the left-right direction.

As a further improvement of the above solution, a3 is less than a 4.

As a further improvement of the scheme, the angle range of the a3 is 13-23 degrees, and the ratio of L2 to D3 is (64-84): 100.

as a further improvement of the scheme, the angle range of the a5 is 15-25 degrees, and the ratio of R2 to D3 is (44-64): 100, the ratio of L3 to D3 is (17-37): 100.

as a further improvement of the scheme, the ratio of D2 to D3 is (74-94): 100, the ratio of L3 to D3 is (34-54): the angle range of 100, a4 is 17-26 degrees.

As a further improvement of the scheme, the ratio of D1 to D2 to D3 is (128-132): (138-142): 100, the ratio of D to D2 is 0.58-0.64, D3: a: b: e: the ratio of H is 100: (31-51): (28-48): (23-43): (9-15), the ratio of F to A is 0.32-0.36, the ratio of G to C is 0.52-0.56, and the ratio of A to C is 1: (0.95-1.05), wherein the ratio of D3 to R is 100: (44-64), the angle range of a2 is 33-43 degrees.

As a further improvement of the scheme, the angle range of the a1 is 25-35 degrees, and the ratio of D3 to L is 100: (18-38).

The utility model has the advantages that: the utility model provides an oblique flow fan, includes casing and impeller, the casing includes stack shell, motor jar and a plurality of stator, a plurality of the stator with the axis of motor jar for axis annular array connect in on the side of motor jar, the stator is the even lamellar body of wall thickness, the tow sides of stator are first side and second side respectively, first side is located and is close to one side of the less bottom surface of diameter on the motor jar, first side is the internal diameter and is part of the cylinder face of R2, the generating line perpendicular to of first side the axis of motor jar. According to the contrast of experimental result, the utility model discloses can improve the total pressure of fan. The utility model is used for the fan.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a schematic front view of an embodiment of the present invention;

fig. 2 is a schematic front view of a motor barrel according to an embodiment of the present invention;

FIG. 3 is an enlarged view of A in FIG. 1;

FIG. 4 is a schematic view of the blade in the embodiment of the present invention in the unfolded state

FIG. 5 is a schematic view of a blade in an embodiment of the invention in a cross-section perpendicular to the forming axis

Fig. 6 is a left side view schematically illustrating the structure of the impeller according to the embodiment of the present invention;

fig. 7 is a front view schematically illustrating the structure of the impeller according to the embodiment of the present invention;

fig. 8 is a front view schematically illustrating the structure of the hub according to the embodiment of the present invention;

in the drawings: 101-hub, 102-blade, 103-root edge, 104-front edge, 105-top edge, 106-rear edge, 107-positive pressure surface, 108-forming axis, 109-first reference surface, 110-reference starting point, 111-reference terminal point, 112-reference line, 113-dividing point, 201-barrel, 202-air inlet, 203-air outlet, 204-left half barrel, 205-motor barrel, 206-guide vane, 207-first side surface, 208-installation reference surface, 209-motor and 210-outlet pipe.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. In addition, all the coupling/connection relationships mentioned herein do not mean that the components are directly connected, but mean that a better coupling structure can be formed by adding or reducing coupling accessories according to specific implementation conditions. The utility model provides an each technical feature can the interactive combination under the prerequisite of conflict each other.

With reference to fig. 1 to 8, this is an embodiment of the invention, specifically:

a diagonal flow fan comprising a casing and an impeller, the casing comprising:

the barrel body 201: the cylinder body 201 is arranged along the left-right direction, the left end and the right end of the cylinder body 201 are respectively provided with an air inlet 202 and an air outlet 203, the cylinder body 201 comprises a left half cylinder 204 and a right half cylinder which are arranged in bilateral symmetry, the left half cylinder 204 is a circular truncated cone, the diameter of the left bottom edge of the left half cylinder 204 is smaller than that of the right bottom edge of the left half cylinder 204, the air inlet 202 is arranged on the left side of the left half cylinder 204, the diameter of the air inlet 202 is D3, the length of the left half cylinder 204 is L2, and the included angle between the bus of the left half cylinder 204 and the central axis of the left half cylinder 204 is a 3;

motor barrel 205: the motor barrel 205 is a circular truncated cone, the central axis of the motor barrel 205 is coaxially arranged with the central axis of the barrel body 201, the motor barrel 205 is fixedly connected to the inner side of the right half barrel, the diameter of the left bottom edge of the motor barrel 205 is larger than that of the right bottom edge of the motor barrel 205, the diameter of the left bottom edge of the motor barrel 205 is d2, the length of the motor barrel 205 is L3, and the included angle between the bus bar of the motor barrel 205 and the central axis of the motor barrel 205 is a 4;

seven guide vanes 206: seven of the vanes 206 are connected to the side of the motor barrel 205 in an annular array about the central axis of the motor barrel 205, the guide vane 206 is a sheet with uniform wall thickness, the front and back surfaces of the guide vane 206 are respectively a first side surface 207 and a second side surface, the first side 207 is located on a side near the lower diameter bottom surface of the motor barrel 205, the first side 207 is a portion of a cylindrical surface with an inner diameter R2, the generatrix of the first side 207 is perpendicular to the central axis of the motor barrel 205, a left side of the first side 207 and a right side of the first side 207 form a mounting reference plane 208, the mounting reference surface 208 forms an angle a5 with the central axis, the guide vane 206 has an arc length L3, the edge of the guide vane 206 connected with the motor barrel 205 is called an inner side edge, and the edge of the guide vane 206 opposite to the inner side edge is connected with the barrel 201;

the impeller is rotatably connected with the motor barrel 205, a central axis of the impeller is coaxially arranged with a central axis of the motor barrel 205, and the impeller is arranged in the left half barrel 204. A motor 209 is fixed within the motor barrel 205, and the motor 209 drives the impeller to rotate.

The rotating airflow may change flow direction through the guide vanes 206, making the airflow more biased to flow axially, increasing the total pressure of the fan. The flow guide surface of the guide vane 206 is arc-shaped, which can reduce the loss of the air flow.

Further as a preferred embodiment, the impeller comprises:

hub 101: the hub 101 is a truncated cone, the central axis of the hub 101 and the central axis of the motor barrel 205 are coaxially arranged, the hub 101 is arranged in the left half barrel 204, the hub 101 is fixedly connected with a driving shaft, the driving shaft and the central axis of the hub 101 are coaxially arranged, the hub 101 is rotatably connected with the motor barrel 205 through the driving shaft, the diameter of the right bottom edge of the hub 101 is larger than that of the left bottom edge of the hub 101, the diameter of the right bottom edge of the hub 101 is d, the height of the hub 101 is L, and the included angle between the bus of the hub 101 and the axis of the hub 101 is a 1;

six blades 102: the six blades 102 are connected to the side surface of the hub 101 in an annular array by taking the central axis of the hub 101 as an axis, the blades 102 are sheet bodies with uniform wall thickness, the front surface and the back surface of each blade 102 are respectively a positive pressure surface 107 and a negative pressure surface, the positive pressure surface 107 is arranged on one side close to the bottom surface with the larger diameter on the hub 101, the edge of the positive pressure surface 107 comprises a root edge 103, a front edge 104, a top edge 105 and a back edge 106 which are sequentially connected, the root edge 103 is connected with the side surface of the hub 101, and the back edge 106 is arranged on one side close to the bottom surface with the larger diameter on the hub 101; the positive pressure surface 107 is a part of a cylindrical surface with the inner diameter of R, a forming axis 108 is arranged on the positive pressure surface 107, and the forming axis 108 is overlapped with one cylindrical generatrix of the cylindrical surface; the surface formed by the motion track of the top edge 105 is called a top surface, the generatrix of the top surface is a straight line, the diameter of the round edge on the top surface close to the rear edge 106 is D2, the diameter of the round edge on the top surface close to the front edge 104 is D1, and D2 is larger than D1; a first reference plane 109 is arranged on the blade 102, the central axis of the hub 101 is in the first reference plane 109, the intersection point of the first reference plane 109 and the root edge 103 is called a reference starting point 110, and the intersection point of the first reference plane 109 and the top edge 105 is called a reference terminal point 111;

the blade 102 is in a flat state: a reference line 112 is formed by connecting the reference starting point 110 and the reference end point 111, a dividing point 113 is arranged on the reference line 112, the reference line 112 and the forming axis 108 intersect at the dividing point 113, the clockwise rotation angle from the reference line 112 to the forming axis 108 with the dividing point 113 as a vertex is a2, and a2 is less than 90 degrees; the intersection of the root edge 103 and the back edge 106 is referred to as a first intersection, the intersection of the back edge 106 and the top edge 105 is referred to as a second intersection, the intersection of the top edge 105 and the front edge 104 is referred to as a third intersection, the intersection of the front edge 104 and the root edge 103 is referred to as a fourth intersection, the distance from the boundary point 113 to the reference starting point 110 is H, the distance from the reference starting point 110 to the fourth intersection is F, the distance from the fourth intersection to the first intersection is a, the distance from the third intersection to the fourth intersection is B, the distance from the third intersection to the reference end point 111 is G, the distance from the third intersection to the second intersection is C, and the distance from the second intersection to the first intersection is E.

When the impeller rotates, the positive pressure surface 107 with the arc design generates pressure on air to form wind. The fan blades are designed in an arc shape, so that loss of wind when the wind passes through the fan blades is reduced, pressure is increased, the efficiency of the fan is improved, the air supply flow is increased, and the total pressure is improved.

Further, as a preferred embodiment, the diameter of the air inlet 202 is the same as that of the air outlet 203.

Further, in a preferred embodiment, the motor barrel 205 is provided with an outlet pipe 210 having an elliptical cross section, and the major axis of the ellipse is arranged in the left-right direction. The power line of the motor 209 is led to the external power supply through the outlet pipe 210. The conventional circular outlet pipe 210 generates a vortex in the airflow, which results in a large airflow loss. The elliptical outlet pipe 210 can reduce the generation of vortices in the airflow.

Further as a preferred embodiment, a3 is less than a 4. The air current flows to air outlet 203 from the middle part of stack shell 201, and the distance grow between the medial surface of stack shell 201 and the side of motor section of thick bamboo 205, the flow cross section grow of air current, and because the gas flow that passes through is the same, the cross-section grow makes the velocity of flow slow down, and atmospheric pressure increases, can improve the atmospheric pressure of air outlet 203, improves the total pressure of fan.

Because same fan can all demonstrate different performance under different operating modes, carry out data measurement to current diagonal flow fan under different operating modes, measured data is as shown in table 1:

table 1:

the chassis of the present embodiment was tested as follows:

the size of the casing in this embodiment is: the length of D3 is 100, the length of L2 is 74, the angle of a3 is 18 degrees, the length of D2 is 84, the length of L3 is 44, the angle of a4 is 21 degrees, the length of R2 is 54, the angle of a5 is 20 degrees, the length of L4 is 27, and an elliptical outlet pipe is adopted. The length of this embodiment is in millimeters. This casing and current impeller collocation use, put and carry out the experiment in the same operating mode with in table 1, measured data is shown as table 2:

table 2:

through the data of contrast table 1 and table 2, it is visible the utility model discloses the current impeller of contrast is showing when improving the total pressure, and fan efficiency also obtains improving.

The utility model discloses a carry out the organic configuration to each dimensional parameter of stack shell, motor cylinder and stator, let the utility model discloses higher fan efficiency and total pressure have. When some of the enclosure parameters are changed, the fan produces different effects. To name a few examples, specifically:

example 1: the size of the casing that uses to carry out the test of table 2, the pipe of being qualified for the next round of competitions changes the cross-section into circular shape, uses this casing and current impeller collocation, puts and tests in the same operating mode with in table 2, and measured data is as shown in table 3:

table 3:

comparing the data in tables 2 and 3, it can be seen that when the outlet pipe is changed to be circular in cross-section, the efficiency of the full pressure and the blower is reduced.

Example 2: when the relationship between the sizes of a3 and a4 is changed to a3 is larger than a4, a3 is 25 degrees, a4 is 15 degrees, the sizes related to a3 and a4 are changed adaptively, other parameters are basically unchanged, then the experiment is carried out under the same working conditions as those in the table 2, and the measured data are shown in the table 4:

table 4:

comparing the data in table 2 with the data in table 1 and table 4, it can be seen that when a3 is greater than a4, a3 is 25 degrees and a4 is 15 degrees, and the measured full pressure and fan efficiency is lower than that of the existing fan, and the performance is poor. If a3 is changed to be equal to a4, the full pressure data of the fan is reduced by about 5% compared with the data in the table 2 under the same working condition.

The impeller of this example was tested as follows:

the size of the impeller in this example is: length of D2 was 140, length of D1 was 130, ratio of D to D2 was 0.61, angle of a2 was 38 degrees, length of a was 41, length of B was 38, length of C was 41, length of E was 33, ratio of F to a was 0.34, ratio of G to C was 0.54, length of H was 12, R was 54, angle of a1 was 30 degrees, length of L was 28. This impeller and current casing collocation use, put and carry out the experiment in the same operating mode with in table 1, measured data is shown as table 5:

table 5:

the utility model discloses a carry out the organic configuration to each dimensional parameter of blade and wheel hub, let the utility model discloses higher fan efficiency and total pressure have. When changing some parameters, the impeller produces different effects. For example:

example 3: the angle range of a2 was changed to 50 degrees, the dimensions associated with a2 were adapted, and the remaining parameters were substantially unchanged, and then the experiment was performed under the same conditions as in table 5, and the measured data are shown in table 6:

table 6:

comparing the data in table 6 with the data in tables 1 and 5, it can be seen that when the angle of a2 is changed to 50 degrees, the efficiency and the full pressure of the fan are reduced to the level of the existing impeller, and even worse effect is generated. The angle of a2 is changed to 33 degrees, and the fan efficiency measured in the test can be improved by 1.5-1.9% compared with the existing impeller under the same working condition; the angle of a2 is changed to 43 degrees, and the fan efficiency measured in the test can be improved by 1.6-1.8% compared with the existing impeller.

Example 4: the ratio of A to C is 1: 2, similar to the current situation that the top edge 105 and the root edge 103 of the existing fan blade are long, the sizes related to a and C are adaptively changed, other parameters are basically unchanged, then the experiment is carried out in the same working condition as that in table 5, and the measured data is shown in table 7:

table 7:

by comparing the data in table 1 with those in table 7 and table 5, it can be seen that in the case of changing the ratio of a to C to 1: 2, the efficiency and the total pressure of the fan are slightly improved compared with the effect of the existing impeller, but are not obvious.

The impeller of the present embodiment and the casing of the present embodiment were tested in combination as follows:

the impeller of this embodiment is used with the casing of this embodiment in a matched manner, and the experiment is performed under the same working conditions as in table 1, and the measured data is shown in table 8:

table 8:

therefore, the impeller of the embodiment is matched with the casing of the embodiment for use, so that the full pressure and the fan efficiency of the fan can be greatly increased, the research on the diagonal flow fan is further carried out, and the use cost is greatly reduced. Through reasonable setting of all sizes and parameters of the impeller and the casing, the overall performance of the fan can be obviously improved. Comparing the data in tables 2 to 8 above, it can be found that if one or more related parameters are changed individually, the performance improvement effect on the fan is not significant or obvious, and the parameters are set reasonably, so that the fan has the full-pressure and high-efficiency effect.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims

1. The utility model provides a diagonal flow fan which characterized in that: including casing and impeller, the casing includes: a barrel body:

the cylinder body is arranged along the left-right direction, the left end and the right end of the cylinder body are respectively provided with an air inlet and an air outlet, the cylinder body comprises a left half cylinder and a right half cylinder which are arranged in bilateral symmetry, the left half cylinder is a circular truncated cone, the diameter of the left bottom edge of the left half cylinder is smaller than that of the right bottom edge of the left half cylinder, the air inlet is formed in the left side of the left half cylinder, the diameter of the air inlet is D3, the length of the left half cylinder is L2, and the included angle between the bus of the left half cylinder and the central axis of the left half cylinder is a 3;

a motor barrel:

the motor barrel is a circular truncated cone, the central axis of the motor barrel and the central axis of the barrel body are coaxially arranged, the motor barrel is fixedly connected to the inner side of the right half barrel, the diameter of the left bottom edge of the motor barrel is larger than that of the right bottom edge of the motor barrel, the diameter of the left bottom edge of the motor barrel is d2, the length of the motor barrel is L3, and the included angle between the bus of the motor barrel and the central axis of the motor barrel is a 4;

a plurality of vanes:

the guide vanes are connected to the side face of the motor barrel in an annular array mode by taking the central axis of the motor barrel as an axis, the guide vanes are sheet bodies with uniform wall thickness, the front face and the back face of each guide vane are respectively a first side face and a second side face, the first side face is arranged on one side close to the bottom face with the smaller diameter on the motor barrel, the first side face is a part of a cylindrical surface with the inner diameter of R2, a bus of the first side face is perpendicular to the central axis of the motor barrel, the left side edge of the first side face and the right side edge of the first side face form an installation reference face, the included angle between the installation reference face and the central axis is a5, the arc length of each guide vane is L3, the edge, connected with the motor barrel, on each guide vane is called an inner side edge, and the edge, opposite to the motor barrel, on each guide vane;

2. The diagonal flow fan according to claim 1, wherein: the impeller includes:

hub:

the hub is a truncated cone, the central axis of the hub and the central axis of the motor barrel are coaxially arranged, the hub is arranged in the left half barrel, a driving shaft is fixedly connected to the hub, the driving shaft and the central axis of the hub are coaxially arranged, the hub is rotatably connected with the motor barrel through the driving shaft, the diameter of the right bottom edge of the hub is larger than that of the left bottom edge of the hub, the diameter of the right bottom edge of the hub is d, the height of the hub is L, and the included angle between the bus of the hub and the axis of the hub is a 1;

a plurality of blades:

the blades are connected to the side face of the hub in an annular array mode by taking the central axis of the hub as an axis, the blades are sheet bodies with uniform wall thickness, the front face and the back face of each blade are respectively a positive pressure face and a negative pressure face, the positive pressure face is arranged on one side close to the bottom face with the larger diameter on the hub, the edge of the positive pressure face comprises a root edge, a front edge, a top edge and a rear edge which are sequentially connected, the root edge is connected with the side face of the hub, and the rear edge is arranged on one side close to the bottom face with the larger diameter on the hub; the positive pressure surface is a part of a cylindrical surface with the inner diameter of R, a forming axis is arranged on the positive pressure surface, and the forming axis is superposed with one cylindrical generatrix of the cylindrical surface;

the surface formed by the motion trail of the top edge is called a top blade surface, the generatrix of the top blade surface is a straight line, the diameter of the round edge on the top blade surface close to the rear edge is D2, the diameter of the round edge on the top blade surface close to the front edge is D1, and D2 is larger than D1;

a first reference surface is arranged on the blade, the central axis of the hub is in the first reference surface, the intersection point of the first reference surface and the root edge is called a reference starting point, and the intersection point of the first reference surface and the top edge is called a reference terminal point;

the blade is in a flat state:

connecting the reference starting point and the reference terminal point to form a reference line, wherein a dividing point is arranged on the reference line, the reference line and the forming axis intersect at the dividing point, the clockwise rotation angle from the reference line to the forming axis by taking the dividing point as a vertex is a2, and a2 is less than 90 degrees; the intersection point of the root edge and the rear edge is called a first intersection point, the intersection point of the rear edge and the top edge is called a second intersection point, the intersection point of the top edge and the front edge is called a third intersection point, the intersection point of the front edge and the root edge is called a fourth intersection point, the distance from the boundary point to the reference starting point is H, the distance from the reference starting point to the fourth intersection point is F, the distance from the fourth intersection point to the first intersection point is A, the distance from the third intersection point to the fourth intersection point is B, the distance from the third intersection point to the reference terminal point is G, the distance from the third intersection point to the second intersection point is C, and the distance from the second intersection point to the first intersection point is E.

3. The diagonal flow fan according to claim 1, wherein: the diameters of the air inlet and the air outlet are the same.

4. The diagonal flow fan according to claim 1, wherein: the motor cylinder is provided with an outlet pipe with an oval cross section, and the long axis of the oval is arranged along the left and right directions.

5. The diagonal flow fan according to claim 1, wherein: a3 is less than a 4.

6. The diagonal flow fan according to claim 1, wherein: the angle range of a3 is 13-23 degrees, and the ratio of L2 to D3 is (64-84): 100.

7. the diagonal flow fan according to claim 1, wherein: the angle range of a5 is 15-25 degrees, and the ratio of R2 to D3 is (44-64): 100, the ratio of L3 to D3 is (17-37): 100.

8. the diagonal flow fan according to claim 1, wherein: the ratio of D2 to D3 is (74-94): 100, the ratio of L3 to D3 is (34-54): the angle range of 100, a4 is 17-26 degrees.

9. The diagonal flow fan according to claim 2, wherein: the ratio of D1 to D2 to D3 is (128-132): (138-142): 100, the ratio of D to D2 is 0.58-0.64, D3: a: b: e: the ratio of H is 100: (31-51): (28-48): (23-43): (9-15), the ratio of F to A is 0.32-0.36, the ratio of G to C is 0.52-0.56, and the ratio of A to C is 1: (0.95-1.05), wherein the ratio of D3 to R is 100: (44-64), the angle range of a2 is 33-43 degrees.

10. The diagonal flow fan according to claim 2, wherein: the angle range of the a1 is 25-35 degrees, and the ratio of D3 to L is 100: (18-38).