WO2018129769A1 - Regulation device for fan blades and counter-rotating axial flow fan - Google Patents

Abstract

A regulation device for fan blades and a counter-rotating axial flow fan, comprising: a driving rod (101), the driving rod (101) comprising a driving end, which is located outside a fan housing (23), and a connection end, which connects a transmission component; the connection end of the driving rod (101) is connected to a first transmission component, which may rotate following the rotation of the driving rod (101); the first transmission component is connected to a second transmission component, which may move axially along a fan axle (40) following the rotation of the first transmission component; the second transmission component is connected to a blade regulation disc (16), which may move axially following the axial movement of the second transmission component, wherein the outer edge of the blade regulation disc (16) is connected to each blade rotation arm (15), an end of each blade rotation arm (15) being connected to the blade regulation disc (16), while another end is connected to each fan blade.

Description

Fan blade adjusting device and counter-rotating axial fan

Cross-reference to related applications

The present application is based on a Chinese patent application filed on Jan. 16, 2017, the entire disclosure of which is hereby incorporated by reference.

Technical field

The invention relates to an axial flow fan manufacturing technology, in particular to a fan blade adjusting device and a counter-rotating axial fan.

Background technique

For a rotary-shaft fan, it refers to two impellers with the same diameter, the hub ratio and the same speed, and the opposite direction of rotation of the blades, which are usually driven by two motors. The advantage is that, under the same flow rate, the pressure gain can be significantly increased (the total pressure of the fan outlet is increased relative to the total inlet pressure), and the inherent weakness of the axial fan total pressure gain is relatively low; the front stage impeller is generated. The airflow rotation is just eliminated by the rotation of the rear stage impeller, directly producing a single axial flow that meets the exit requirements. No baffles are needed, shortening the axial dimension and making the structure simple. The separation of the airflow on the baffle is avoided at all, reducing energy loss, improving efficiency and reducing noise. Because the two-stage counter-rotating fan has removed the middle and rear guide vanes, the size of the fuselage is greatly shortened under the same ventilation capacity; the resistance of the airflow movement is greatly reduced, so that the total efficiency of the fan is greatly improved; Dragging at the end causes the capacity of each motor to drop drastically. This not only causes a large drop in the maximum load of the electronic control system, but also reduces the technical level of the electronic control system, thereby making the power supply and electronic control equipment investment and operation control of the fan. The technical requirements have been greatly reduced.

At present, the counter-rotating axial fan on the market mostly adopts an integral impeller, and the blade mounting angle is not Adjustment. When there is a certain error in the design or manufacture of the two-stage impeller installation angle, the actual work can not be corrected; the maximum efficiency of the rotary fan is low, and the phenomenon of surge is prone to occur, which aggravates the vibration and affects the service life.

Therefore, in the manufacture of a counter-rotating axial fan, the development of a blade mounting angle energy adjustment technique has begun. For example, in the patent document with the publication number CN103727062 A and the publication date of April 16, 2014, "an axial flow fan blade adjustment device" is disclosed, which is mainly composed of a moving blade, a transmission group, a hub, a hydraulic transmission system and a control. Disk composition. During the blade adjustment process, the hydraulic system is powered to cause the control panel to drive the blades to change the mounting angle. This kind of structure is costly on the one hand, because the hydraulic system includes a series of parts such as pump station, pipeline, servo valve, servo cylinder, etc., and a considerable part of the parts need to be specially made, the process is complicated, the maintenance cost is high, and the space is small. The air duct affects the flow of air, limits the size of the hub, and limits the application of the mechanism in small and medium-sized wind turbines.

The utility model publication CN204386932 U, the utility model patent document published on June 10, 2015, discloses an "axial flow fan moving blade adjustable device", which causes the nut to generate axial displacement by driving the screw to rotate, and The adjustment arm of the blade is driven to adjust the angle of the blade. However, the mechanism for adjusting the blades is all placed in the air cylinder, which causes inconvenience in maintenance and affects the performance of the fan.

In the utility model patent document whose announcement number is CN201865932 U and the announcement date is June 15, 2011, the "tunable angle-rotating axial flow type energy-saving fan for mines" is disclosed, which is driven by a large bevel gear. The series of small bevel gears rotate to realize the adjustment of the blade angle. During the adjustment process, there are some cases where the cooperation of the moving blades is poor, and the shutdown adjustment is needed, which is not conducive to mine safety.

Therefore, the fan blade installation angle adjusting device has a complicated structure, is difficult to maintain, and can only be shut down and adjusted, which is an urgent problem to be solved.

Summary of the invention

In view of this, the embodiments of the present invention are expected to provide a fan blade adjusting device and a counter-rotating axial fan, which can change the mounting angle of the fan blade without stopping the machine, and is convenient to adjust and simple in structure.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

An embodiment of the present invention provides a fan blade adjusting device, the fan includes a fan casing, a fan shaft, a fan hub, and a fan blade, and the fan blade adjusting device includes a driving rod, a transmission component, and a blade adjusting plate, wherein

The driving rod includes a driving end and a connecting end, the driving end is located outside the fan casing, and the connecting end of the driving rod is connected to the transmission component through the fan casing, and the connecting end of the driving rod Providing a first connecting component that connects the transmission component;

The transmission component is sleeved on the fan shaft, and includes a first transmission component that can rotate with the rotation of the drive rod and can move axially along the fan shaft along with rotation of the first transmission component a second transmission component; the first transmission component includes a second connection component that mates with the first connection component of the drive rod; the second transmission component is coupled to the first transmission component at one end;

The blade adjustment disk is sleeved on the fan shaft and penetrates into a fan hub, and the blade adjustment disk can move axially with the axial movement of the second transmission component; Each of the blade turning arms is circumferentially connected, and one end of each of the blade turning arms is connected to the blade adjusting disk, and the other end is connected to each fan blade.

Preferably, the first connecting component is a first bevel gear and the second connecting component is a second bevel gear.

Preferably, the second transmission component comprises an axial movement sleeve, a rotation isolation disc and a push-pull rod; the axial movement sleeve is connected at one end to the first transmission component, and the other end is fixed to the rotation isolation disc; Rotating the spacer disk includes isolating the rotating bearing; the push-pull rod is coupled to the rotating spacer disk at one end and the blade regulating disk through the fan hub at the other end.

Preferably, the axial movement sleeve is disposed on the second bevel gear, and the outer surface of the axial movement sleeve is provided with an external thread, and the second bevel gear is provided with the inner thread. Thread.

Preferably, the axial movement sleeve is disposed through the second bevel gear, and the axial movement sleeve outer surface is fixed with a first rack, and the second bevel gear is provided with the first rack a mating first gear; the second bevel gear is provided with a predetermined structure for driving the rotation of the first gear.

Preferably, the second bevel gear is provided with an inner hole parallel to the fan shaft, and the predetermined structure is an inner helical tooth disposed in the inner hole of the second bevel gear and engaged with the first gear.

Preferably, the axially moving sleeve is fixed to the rotating spacer disk by a shaft retaining ring.

Preferably, the fan blade adjusting device further includes a sleeve sleeved on the fan shaft and configured to be apart from the fan shaft by the second transmission member.

Preferably, the fan blade adjusting device further includes a blade adjusting angle indicating member including an angle indicating shaft rotatable with an axial movement of the second transmitting member; the angle indicating the shaft connection One end of the second transmission member is provided with a third connection assembly, and the second transmission member is provided with a fourth connection assembly that matches the third connection assembly.

Preferably, the third connecting component is a second gear, and the fourth connecting component is a second rack; and the blade adjusting angle indicating component is provided with a tick mark outside the fan casing.

The embodiment of the invention further provides a counter-rotating axial fan, comprising a fan shell, a front stage impeller and a rear stage impeller, wherein the front stage impeller and the rear stage impeller each comprise a fan shaft, a fan hub and a fan blade, The front stage impeller includes a front stage fan blade adjustment device, and the rear stage impeller includes a rear stage fan blade adjustment device; the front stage fan blade adjustment device and the rear stage fan blade adjustment device each include a drive rod, a transmission member, and a blade adjustment Disk; among them,

The driving rod includes a driving end and a connecting end, the driving end is located outside the fan casing, and the connecting end of the driving rod is connected to the transmission component through the fan casing, and the connecting end of the driving rod Providing a first connecting component that connects the transmission component;

The transmission component is sleeved on the fan shaft, and includes a first transmission component that can rotate with the rotation of the drive rod and can move axially along the fan shaft along with rotation of the first transmission component a second transmission component; the first transmission component includes a second connection component that mates with the first connection component of the drive rod; the second transmission component is coupled to the first transmission component at one end;

The blade adjustment disk is sleeved on the fan shaft and penetrates into a fan hub, and the blade adjustment disk can move axially with the axial movement of the second transmission component; Each of the blade turning arms is circumferentially connected, and one end of each of the blade turning arms is connected to the blade adjusting disk, and the other end is connected to each fan blade.

Preferably, the driving rod of the front stage fan blade adjusting device is sleeved on the driving rod of the rear stage fan blade adjusting device; the first connecting component is a first bevel gear, and the second connecting component is a second bevel gear; a first bevel gear of the front stage fan blade adjusting device and a first bevel gear of the rear stage fan blade adjusting device are spaced apart by a predetermined distance in an axial direction of the driving rod; the front stage fan The second bevel gear of the blade adjustment device and the second bevel gear of the rear stage fan blade adjustment device are axially spaced apart by a predetermined distance in the axial direction of the fan shaft of the rear stage impeller.

Preferably, the second transmission components of the front stage fan blade adjusting device and the rear stage fan blade adjusting device respectively comprise an axial moving sleeve, a rotating isolating disk and a push-pull rod; the axial moving sleeve is connected at one end to the first a transmission member, the other end of which is fixed to the rotating spacer disk; the rotating spacer disk includes an isolated rotating bearing; the push-pull rod is fixed at one end to the rotating spacer disk, and the other end is connected to the blade through the fan hub to adjust plate.

Preferably, the axial moving sleeve of the front stage fan blade adjusting device and the axial moving sleeve of the rear stage fan blade adjusting device are each provided with at least two axially moving sleeves in the circumferential direction of the fan shaft A through slot that is staggered and does not affect the movement of another axially moving sleeve.

Preferably, the axial movement of the front stage fan blade adjusting device is inserted through the second bevel gear of the front stage fan blade adjusting device, and the outer surface of the axial moving sleeve is provided with an external thread, The two bevel gears are provided with internal threads that cooperate with the external threads.

Preferably, the axial movement of the rear stage fan blade adjusting device is sleeved through the second bevel gear of the rear stage fan blade adjusting device, and the outer surface of the axial moving sleeve is fixed with the first rack. The rear stage fan blade adjusting device is provided with a first gear that cooperates with the first rack; and the second bevel gear is provided with an inner helical tooth that cooperates with the first gear.

Preferably, the rotating isolation disk of the front stage fan blade adjusting device comprises a first rotating isolation disk disposed between the driving mechanism and the rear stage fan, and a rear stage impeller and the front stage impeller a second rotating spacer disk; the push-pull rod of the front-stage fan blade adjusting device is connected to the first rotating spacer disk at one end, and the other end is connected to the second wheel after passing through the fan hub of the rear-stage impeller a separating disc; a first rotating partitioning disc of the front stage fan blade adjusting device and a rotating separating disc of the rear stage fan blade adjusting device, the axial distance of the fan shaft of the rear stage impeller being spaced apart by a predetermined distance.

Preferably, the second rotating spacer disk is connected to the push-pull rod of the front-stage fan blade adjusting device at one end, and the other end is connected to the blade adjusting disk of the front-stage fan blade adjusting device; The front-stage impeller fan shaft and the rear-stage impeller fan shaft are provided with isolated rotating bearings.

Preferably, the second rotating isolation disk further includes a limiting rod connected to the fan casing, the limiting rod is connected to the second rotating isolation disk at one end, and the fan casing is connected to the other end; The pole can only move axially in the fan casing.

Preferably, the blade adjustment disk of the front stage fan blade adjustment device is provided with a return spring that restores the position of the blade adjustment disk.

Preferably, the axial moving sleeves of the front stage fan blade adjusting device and the rear stage fan blade adjusting device are both fixed to the rotating isolating disk by a shaft retaining ring.

Preferably, the counter-rotating axial fan is provided with a second transmission component that is sleeved on the fan shaft of the rear-stage impeller and configured to separate the front-stage fan blade adjusting device and the rear-stage fan blade adjusting device. a bushing that is in contact with the fan shaft of the rear stage impeller.

Preferably, the fan blade adjusting device further includes a blade adjusting angle indicating member including an angle indicating shaft rotatable with an axial movement of the second transmitting member; the angle indicating the shaft connection One end of the second transmission member is provided with a third connection assembly, and the second transmission member is provided with a fourth connection assembly that matches the third connection assembly.

Preferably, the third connecting component is a second gear, and the fourth connecting component is a second rack; and the blade adjusting angle indicating component is provided with a tick mark outside the fan casing.

The fan blade adjusting device and the counter-rotating axial fan of the embodiment of the present invention include a driving rod, and the driving rod includes a driving end outside the fan casing and a connecting end connecting the transmission component; the driving a connecting end of the rod is connected with a first transmission member rotatable with the rotation of the driving rod; the first transmission member is coupled with a first axial movement along the fan shaft as the first transmission member rotates a second transmission member; the second transmission member is coupled to a blade adjustment disk that is axially movable with an axial movement of the second transmission member, the blade adjustment disk outer circumference connecting the respective blade rotation arms, and each blade rotation arm is connected at one end The blade adjustment disk is connected to each fan blade at the other end. It can be seen that the fan blade adjusting device and the counter-rotating axial fan of the embodiment of the invention drive the first transmission component to rotate by the driving rod, and the first transmission component drives the second transmission. The component moves axially, thereby pushing the blade adjustment plate to move, and the purpose of changing the installation angle of the fan blade is achieved, and the adjustment can be conveniently performed without stopping the machine. Simple structure.

DRAWINGS

1 is a schematic view of a rotary shaft fan according to an embodiment of the present invention;

2 is a perspective view 1 of a rotary shaft fan according to an embodiment of the present invention;

3 is a perspective view 2 of a rotary shaft fan according to an embodiment of the present invention;

4 is a schematic view showing an axial movement sleeve of a front-stage fan blade adjusting device in a rotary-shaft fan according to an embodiment of the present invention;

5 is a schematic view showing an axial movement sleeve of a rear-stage fan blade adjusting device in a rotary-shaft fan according to an embodiment of the present invention;

Fig. 6 is a schematic view showing the angle adjustment member of the blade in the rotary shaft fan according to the embodiment of the present invention.

detailed description

An embodiment of the present invention provides a fan blade adjusting device, including a driving rod, a transmission component, and a blade adjusting disk, wherein

The driving rod includes a driving end and a connecting end, the driving end is located outside the fan casing, and the connecting end of the driving rod is connected to the transmission component through the fan casing, and the connecting end of the driving rod Providing a first connecting component that connects the transmission component;

The transmission component is sleeved on the fan shaft, and includes a first transmission component that can rotate with the rotation of the drive rod and can move axially along the fan shaft along with rotation of the first transmission component a second transmission component; the first transmission component includes a second connection component that mates with the first connection component of the drive rod; the second transmission component is coupled to the first transmission component at one end;

The blade adjustment disk is sleeved on the fan shaft and is disposed in the fan hub, and the blade adjustment disk can move axially with the axial movement of the second transmission component; Each of the blade turning arms is circumferentially connected, and one end of each of the blade turning arms is connected to the blade adjusting disk, and the other end is connected to each fan blade.

The principle of the embodiment of the present invention is that the first transmission component is driven to rotate by the driving rod, and the first transmission component drives the second transmission component to move axially, thereby pushing the blade adjustment disk to move, thereby achieving the purpose of changing the installation angle of the fan blade.

The outer circumference of the blade adjustment disk is connected to each blade rotation arm, one end of each blade rotation arm is connected to the blade adjustment disk, and the other end is connected to each fan blade; the fan blade can swing to the side of the fan hub, and the blade rotation arm is in the blade Under the push of the adjusting disc, the fan blade can be swung to the side of the fan hub, and the installation angle of the fan blade can also be changed.

The components of the embodiments of the present invention can be summarized as a driving mechanism, a power transmitting mechanism, and an adjusting mechanism according to functions, wherein the driving mechanism includes a driving rod, a first connecting component, and the power transmitting machine The structure includes a first transmission member and a second transmission member, and the adjustment mechanism includes a blade adjustment disk and a blade rotation arm.

The power source of the driving rod of the embodiment of the present invention may be a power machine, such as a motor, or a human hand, such as an operator directly rotating the driving rod through a hand wheel.

Specifically, the first connecting component is a first bevel gear, and the second connecting component is a second bevel gear;

The bevel gear is configured to transmit motion and power between the two intersecting shafts. In the embodiment of the invention, the bevel gear transmits rotation perpendicular to the fan shaft to rotation about the fan shaft, ie, rotation of the drive rod Transfer to the rotation of the first transmission member;

In the embodiment of the present invention, the first transmission component can only rotate about the fan shaft, and can not be moved axially, so that the rotation of the first transmission component can be smoothly transmitted to the axial movement of the second transmission component. The first transmission member is fixed to the fan casing in an axial direction of the fan shaft.

The second transmission component includes an axial movement sleeve, a rotation isolation disc and a push-pull rod; the axial movement sleeve is connected at one end to the first transmission component, and the other end is fixed to the rotation isolation disc; The bearing includes an isolated rotating bearing; the push-pull rod is connected to the rotating spacer disk at one end, and the blade adjusting disk is connected to the other end through the fan hub;

Since the fan shaft and the fan hub are both rotated, the rotation of the isolation disc is required to rotate when the second transmission member transmits the axial movement to the blade adjustment disc. The rotation isolation disc is rotated by the bearing, and the bearing here may be a rolling bearing.

The transmission of the rotation of the first transmission member into the axial movement of the second transmission member can be carried out in a variety of ways.

First, the axial movement sleeve is disposed on the second bevel gear, and the outer surface of the axial movement sleeve is provided with an external thread, and the second bevel gear is provided to cooperate with the external thread. internal thread;

When the second bevel gear is driven by the first bevel gear, rotate around the fan shaft When moving, the axial moving sleeve is axially moved under the driving of the helical movement of the external thread and the internal thread, and the principle is the same as that of the threaded female screw, which will not be described in detail.

Secondly, the axial movement sleeve is disposed on the second bevel gear, and the outer surface of the axial movement sleeve is fixed with a first rack, and the second bevel gear is provided with the first tooth a first gear matched; the second bevel gear is provided with a preset structure for driving the rotation of the first gear;

Specifically, the second bevel gear is provided with an inner hole parallel to the fan shaft, and the predetermined structure is an inner spiral tooth disposed in the inner hole of the second bevel gear and matched with the first gear;

The second mode relates to a multi-stage transmission, that is, the first bevel gear and the second bevel gear are the first stage, the inner helical teeth of the second bevel gear and the first gear are the second stage, the first gear And the first rack is the third level;

Wherein, the cooperation principle of the inner helical tooth of the second bevel gear and the first gear is similar to that of a worm gear, that is, the inner helical gear is like a worm, and is an active member, and the first gear is similar to a worm gear, and is a passive component. The difference is that the worm is an outer helical tooth and the second helical gear is an inner helical tooth that requires custom machining.

Here, the first gear and the first rack may be straight teeth or spiral teeth.

Further, the axial moving sleeve is fixed to the rotating isolation disc by a shaft retaining ring; that is, the axial moving sleeve surface needs to be processed to install the groove of the shaft retaining ring, specifically, both ends of the rotating separating disc It is a shaft retaining ring, and it can also be used as one end shoulder and one end shaft retaining ring.

The device further includes a sleeve sleeved on the fan shaft and configured to separate the second transmission member from the fan shaft; thus avoiding a fan shaft of the rear stage impeller to the second transmission member Impact;

The sleeve, like the first transmission member, is fixed to the fan casing such that contact of the second transmission member with the fan shaft can be separated.

Further, the fan blade adjusting device further includes a blade adjusting angle indicating member that includes a rotation that is rotatable with an axial movement of the second transmitting member An angle indicating shaft; the end of the angle indicating shaft connecting the second transmission member is provided with a third connection assembly, and the second transmission member is provided with a fourth connection assembly matching the third connection assembly.

Specifically, the third connecting component is a second gear, and the fourth connecting component is a second rack; the blade adjusting angle indicating component is provided with a tick mark outside the fan casing;

The scale mark of the blade adjustment angle indicating component may be a dial that rotates according to the rotation of the angle indicating shaft, and marks a fixed pointer on the fan casing, and after adjustment, the scale pointed by the pointer is The adjustment can be known; it can also be a fixed dial, and a pointer that rotates with the angle indicating the rotation of the shaft.

The embodiment of the invention further provides a counter-rotating axial flow fan, comprising a fan shell, a front stage impeller and a rear stage impeller, wherein the front stage impeller and the rear stage impeller each comprise a fan shaft, a fan hub and a fan blade; The front stage impeller includes a front stage fan blade adjusting device, and the rear stage impeller includes a rear stage fan blade adjusting device; the implementation principle of the front stage fan blade adjusting device and the rear stage fan blade adjusting device is the same as the fan blade adjustment described above. Device, no longer repeat;

However, since there are two sets of fan blade adjusting devices, in order to make them work independently, they do not interfere with each other, and in order to facilitate the operation, two sets of fan blade adjusting devices need to be installed in the same position, so a specific design is required in the structure. details as follows:

a driving rod of the front stage fan blade adjusting device and a driving rod of the rear stage fan blade adjusting device are respectively inserted into the fan from the fan casing and connected to the first transmission member; a driving rod of the stage fan blade adjusting device is sleeved on a driving rod of the rear stage fan blade adjusting device;

Specifically, the driving rod of the front stage fan blade adjusting device is a hollow rod, and the driving rod of the rear stage fan blade adjusting device is a solid rod.

a first bevel gear of the front stage fan blade adjusting device and a first bevel gear of the rear stage fan blade adjusting device are spaced apart by a predetermined distance in an axial direction of the driving rod;

Specifically, the first bevel gear of the rear stage fan blade adjusting device is closer to the rear stage a fan shaft of the impeller, the first bevel gear of the front stage fan blade adjusting device being radially outside the fan shaft of the rear stage impeller of the first bevel gear of the rear stage fan blade adjusting device.

The second bevel gear of the front stage fan blade adjusting device and the second bevel gear of the rear stage fan blade adjusting device are axially spaced apart by a predetermined distance in the axial direction of the fan shaft of the rear stage impeller;

Specifically, the second bevel gear of the front stage fan blade adjusting device is closer to the fan hub of the rear stage impeller, and the second bevel gear of the rear stage fan blade adjusting device is in the front stage fan blade adjusting device The outer side of the fan shaft of the rear stage impeller of the second bevel gear.

In this embodiment, the second transmission components of the front stage fan blade adjusting device and the rear stage fan blade adjusting device respectively comprise an axial moving sleeve, a rotating isolating disk and a push-pull rod; and one end of the axial moving sleeve is connected to the a first transmission member, the other end of which is fixed to the rotating spacer disk; the rotating spacer disk includes an isolated rotating bearing; the push-pull rod is fixed at one end to the rotating spacer disk, and the other end is connected through the fan hub Blade adjustment disc.

In order to prevent the axial moving sleeves of the two sets of fan blade adjusting devices from interfering with each other, the axial moving sleeve of the front stage fan blade adjusting device and the axial moving sleeve of the rear stage fan blade adjusting device are both provided with at least two shelters. The axial movement sleeve is offset from each other in the circumferential direction of the fan shaft, and does not affect the movement of the other axial movement sleeve;

Specifically, the axial movement of the front stage fan blade adjusting device is provided with at least two through slots, and the axial moving sleeve of the rear stage fan blade adjusting device can be inserted from the axial direction at the through slot, and the rear stage fan blade is adjusted. The axial moving sleeve of the device is also provided with a through groove for allowing the axial moving sleeve of the front stage fan blade adjusting device, so that the outer surfaces of the two axial moving sleeves can contact the first transmission component, and mutual Independent axial movement;

Preferably, the axial moving sleeve of the front stage fan blade adjusting device and the axial moving sleeve of the rear stage fan blade adjusting device are respectively provided with four such that the axial moving sleeve is staggered from each other in the circumferential direction of the fan shaft The through grooves are evenly distributed in the circumferential direction.

In order to move the two axially moving sleeves independently, the front stage fan blade adjustment device and the rear The stage fan adjustment device is designed with different transmission structures of the first transmission component and the axial movement sleeve, as follows:

The axial movement of the front stage fan blade adjusting device is inserted through the second bevel gear of the front stage fan blade adjusting device, and the outer surface of the axial moving sleeve is provided with an external thread, and the second bevel gear An internal thread is provided that cooperates with the external thread.

The axial movement of the rear stage fan blade adjusting device is sleeved through the second bevel gear of the rear stage fan blade adjusting device, and the outer surface of the axial moving sleeve is fixed with a first rack, the second The bevel gear is provided with a first gear that cooperates with the first rack; the second bevel gear is provided with an inner hole parallel to the fan shaft of the rear stage impeller, and the inner hole is provided with the first The internal helical teeth of the gears.

Since the drive mechanism of the front stage fan blade adjusting device and the first transmission member are both mounted on the fan shaft of the rear stage impeller, there is also a problem of how to transmit motion through the fan hub of the rear stage impeller. Therefore, the rotary isolating disk of the front stage fan blade adjusting device comprises a first rotating isolating disk disposed between the driving mechanism and the rear stage impeller and disposed on the rear stage impeller and the front stage impeller a second rotating spacer disk; the push rod of the front stage fan blade adjusting device is connected to the first rotating spacer disk at one end, and the other end is connected to the second rotating wheel after passing through the fan hub of the rear stage impeller a disk; a first rotational isolating disk of the front stage fan blade adjusting device and a rotating isolating disk of the rear stage fan blade adjusting device, the axial distance of the fan shaft of the rear stage impeller is spaced apart by a predetermined distance.

Specifically, the second rotating spacer disk is connected to the push-pull rod of the front-stage fan blade adjusting device at one end, and the other end is connected to the blade adjusting plate of the front-stage fan blade adjusting device; The fan shaft of the front stage impeller and the fan shaft of the rear stage impeller are provided with isolated rotating bearings.

In this embodiment, the second rotating isolation disk of the front stage fan blade adjusting device further includes a limiting rod connected to the fan casing, the limiting rod is connected to the second rotating isolation disk at one end, and the other Connecting the fan casing to the end; the limiting rod can only move axially in the fan casing; in particular, the front fan blade adjusting device can be provided with joints at both ends of the limiting rod a second rotating spacer disk and a fan case are respectively connected to the bearing; the one end of the limiting rod is fixed to the second rotating isolating disk, and the other end is movably connected to the fan casing, specifically, the air cylinder a sliding slot is disposed on the inner wall, the limiting rod is provided with a slider matched with the sliding slot; and one end of the limiting rod is fixed to the fan shell, and the other end is movably connected to the second rotating isolating disc .

Further, the blade adjusting plate of the front stage fan blade adjusting device is provided with a return spring for restoring the position of the blade adjusting plate. Since the transmission path of the front stage fan blade adjusting device is relatively long, setting a return spring is advantageous for better Returning the fan blades to the original position; at the same time, the return spring is also advantageous for eliminating the backlash error of the front stage fan blade adjusting device.

The axial moving sleeves of the front stage fan blade adjusting device and the rear stage fan blade adjusting device are all fixed to the rotating isolating disk by a shaft retaining ring.

The fan is provided with a fan disposed on the fan shaft of the rear stage impeller, and configured to separate the second transmission component of the front stage fan blade adjustment device and the rear stage fan blade adjustment device from the rear stage impeller The sleeve that the shaft contacts.

The front fan blade adjusting device and the rear fan blade adjusting device are each provided with a blade adjusting angle indicating component, and the principle of the blade adjusting angle indicating component is the same as that described above, and will not be described again; however, since there are two sets of fan blade adjusting devices Therefore, it is necessary to provide two angle indicating shafts respectively connected to the second transmission parts of the front stage fan blade adjusting device and the rear stage fan blade adjusting device, and two dials respectively disposed outside the fan case .

In order to understand the features and technical contents of the embodiments of the present invention in more detail, the following embodiments of the present invention will be further described with reference to the accompanying drawings and specific application examples. The description is not intended to limit the embodiments of the invention.

1 is a schematic view of a rotary shaft fan according to an embodiment of the present invention; FIG. 2 is a perspective view of a rotary axial fan according to an embodiment of the present invention; FIG. 3 is a schematic view of a rotary axial fan according to an embodiment of the present invention; FIG. 4 is a schematic diagram of an axial moving sleeve of a front-stage fan blade adjusting device in a rotary-shaft fan according to an embodiment of the present invention; FIG. 5 is a schematic diagram of a rear-stage fan blade adjusting a rotary-axis fan in an embodiment of the present invention; FIG. 6 is a schematic view of a blade adjusting angle indicating component in a rotary shaft fan according to an embodiment of the present invention; wherein, for the sake of clarity, FIG. 1, FIG. 2, FIG. Shell, Figure 2 and Figure 3 do not show the front stage impeller;

For simplicity of description, the counter-rotating axial fan and its components are described in the direction shown in FIG. 1, that is, up, down, left, and right refer to the upper, lower, left, and right in FIG.

As shown in FIG. 1-3, a counter-rotating axial fan includes a fan casing 23, a front impeller and a rear impeller. The front impeller and the rear impeller include a fan shaft, a fan hub and a fan blade. The front stage impeller includes a front stage fan blade adjusting device, and the rear stage impeller includes a rear stage fan blade adjusting device; the front stage fan blade adjusting device and the rear stage fan blade adjusting device each include a driving mechanism and a power transmitting mechanism And adjustment mechanism.

The front stage impeller includes a fan shaft 13 and a fan hub 12; the rear stage impeller includes a fan shaft 4 and a fan hub 19.

Specifically, the driving mechanism of the front stage fan blade adjusting device includes a driving rod 101 and a first bevel gear 1, and the first bevel gear 1 is disposed below the driving rod 101; when applied at the upper end of the driving rod 101 Torque, the first bevel gear 1 is rotatable about the axis of the drive rod 101;

In this embodiment, the driving rod 101 is rotated by a manual operation of the hand wheel.

The power transmission mechanism of the front stage fan blade adjusting device includes a second bevel gear 7, an axial moving sleeve 20, a first rotating spacer disk 201, a push-pull rod 18 and a second rotating spacer disk 17; the second bevel gear 7 Rotating around the fan shaft 4 under the driving of the first bevel gear 1; the rotation of the second bevel gear 7 drives the axial movement sleeve 20 to move axially, and then drives the first rotation isolation The disk 201 moves axially, and then the push-pull rod 18 is moved. The push-pull rod 18 drives the second rotating spacer disk 17 to move axially.

The adjustment mechanism of the front stage fan blade adjusting device comprises a blade adjusting disk 16 and a blade turning arm 15; the axial movement of the second rotating spacer disk 17 drives the blade adjusting disk 16 to move, and the fan is adjusted by the blade rotating arm 15 Mounting angle of the blade;

Specifically, the blade adjustment disk 16 is moved to the left, and all the blade rotation arms 15 are rotated backward to drive the fan blades to rotate backward, changing the installation angle of the fan blades; if only the blade rotation arms are seen in FIG. In the fifteenth aspect, the upper fan blade turning arm 15 rotates clockwise, and the lower fan blade turning arm 15 rotates counterclockwise.

The blade adjusting plate 16 of the front stage fan blade adjusting device is provided with a return spring 14 for restoring the position of the blade adjusting plate 16;

The second rotating spacer disk 17 of the front stage fan blade adjusting device further includes a limiting rod 171 connected to the fan casing, and both ends of the limiting rod 171 are provided with joint bearings, respectively connected to the second rotation Isolation disk 17 and fan casing;

Since the angle of the adjusting fan blade is not large in actual use, the axial bearing of the second rotating spacer disk 17 can be satisfied by the joint bearing, and the second rotating spacer disk 17 can also be restricted in the circumferential direction. Sharply turned.

The driving mechanism of the rear stage fan blade adjusting device comprises a driving rod 102 and a first bevel gear 2, the first bevel gear 2 is disposed under the driving rod 102; the driving rod 102 is disposed through the driving In the rod 101, the first bevel gear 2 is below the first bevel gear 1;

Specifically, the driving rod 101 is a hollow rod, and the driving rod 102 is a solid rod;

When a torque is applied to the upper end of the drive rod 102, the first bevel gear 2 is rotatable about the axis of the drive rod 102.

The power transmission mechanism of the rear stage fan blade adjusting device includes a second bevel gear 6, an axial moving sleeve 8, a rotating isolation disk 81 and a push-pull rod 9; the second bevel gear 6 is at the first bevel gear 2 Rotating around the fan shaft 4 under driving; the rotation of the second bevel gear 6 is carried The axial movement sleeve 8 is moved axially, and then the rotary isolation disc 81 is axially moved, and then the push-pull rod 9 is moved;

Specifically, the outer surface of the axial moving sleeve 8 is fixed with a first rack 801, and the second bevel gear 6 is provided with a first gear 5 that cooperates with the first rack 801; the second bevel gear 6 is provided with an inner hole parallel to the fan shaft 4 of the rear stage impeller, the inner hole is provided with inner helical teeth (not shown) that cooperate with the first gear 5;

The first gear 5 and the first rack 801 are both straight teeth.

In order to prevent the axial movement sleeves of the two sets of fan blade adjusting devices from interfering with each other, the two axial moving sleeves are respectively provided with four through grooves for the axial movement sleeves to be offset from each other in the circumferential direction of the fan shaft 4. And evenly distributed in the circumferential direction;

As shown in FIG. 4, the axial moving sleeve 20 of the front-stage fan blade adjusting device has four through grooves 211 formed on the outer circumferential surface of the axial moving sleeve 20, and the through-groove 211 penetrates the two ends, which is convenient The movement of the axial movement sleeve 8 of the rear stage fan blade adjustment device;

Specifically, the surface of the axial moving sleeve 20 is further provided with an external thread 212 matching the internal thread of the second bevel gear 7 (the specific shape of the thread is not drawn in the figure).

As shown in FIG. 5, the axial moving sleeve 8 is also provided with four through slots 811, but because the axial moving sleeve 8 of the rear stage fan blade adjusting device is relatively long, only one end can be penetrated;

Specifically, the surface of the axial moving sleeve 8 is further provided with a first rack 801 matching the first gear 5;

Further, the second bevel gear 6 and the second bevel gear 7 are both fixed to the fan casing 23 of the counter-rotating axial fan through the fixing sleeve 3.

The adjustment mechanism of the rear stage fan blade adjusting device includes a blade adjusting disk 11 and a blade turning arm 10; the movement of the push-pull rod 9 drives the blade adjusting disk 11 to move, and the mounting angle of the fan blade is adjusted by the blade rotating arm 10.

Further, the axial moving sleeve 20 and the axial moving sleeve 8 are both fixed by the shaft retaining ring The rotating spacer disk, that is, the axial moving sleeve 20 is fixed to the first rotating spacer disk 201, and the axial moving sleeve 8 is fixed to the rotating spacer disk 81.

Further, the fan is provided with a second transmission component disposed on the fan shaft 4 of the rear stage impeller, and configured to separate the front stage fan blade adjusting device and the rear stage fan blade adjusting device from the rear a bushing 31 in contact with the fan shaft 4 of the stage impeller;

Specifically, the sleeve 31 is fixed to the fan casing 23 of the counter-rotating axial fan by the fixing sleeve 3 like the first transmission member.

Further, as shown in FIG. 6, the fan blade adjusting device further includes a blade adjusting angle indicating member including an angle indicating shaft 21 rotatable with an axial movement of the second transmitting member 22 indicates the adjustment angles of the front stage and the rear stage, respectively.

Specifically, the end of the angle indicating shaft 21, 22 connected to the second transmission member is provided with a second gear 501, and the second transmission member is provided with a second rack 502 matching the second gear 501; The angle indicating that the other end of the shaft passes through the counter-rotating axial fan casing 23, and is provided with a dial 53 rotatable along the indicating shaft, and the fan casing 23 is provided with a fixing corresponding to the dial 53 Pointer (not shown in the figure).

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in Within the scope of protection of the present invention.

Industrial applicability

The fan blade adjusting device and the counter-rotating axial fan of the embodiment of the invention drive the first transmission component to rotate by the driving rod, and the first transmission component drives the second transmission component to move axially, thereby pushing the blade adjustment disk to move and change. The purpose of the installation angle of the fan blade is that it can be easily adjusted and has a simple structure without stopping the machine.

Claims (24)

A fan blade adjusting device, the fan includes a fan casing, a fan shaft, a fan hub, and a fan blade, and the fan blade adjusting device includes a driving rod, a transmission member, and a blade adjusting plate, wherein The driving rod includes a driving end and a connecting end, the driving end is located outside the fan casing, and the connecting end of the driving rod is connected to the transmission component through the fan casing, and the connecting end of the driving rod Providing a first connecting component that connects the transmission component; The transmission component is sleeved on the fan shaft, and includes a first transmission component that can rotate with the rotation of the drive rod and can move axially along the fan shaft along with rotation of the first transmission component a second transmission component; the first transmission component includes a second connection component that mates with the first connection component of the drive rod; the second transmission component is coupled to the first transmission component at one end; The blade adjustment disk is sleeved on the fan shaft and penetrates into a fan hub, and the blade adjustment disk can move axially with the axial movement of the second transmission component; Each of the blade turning arms is circumferentially connected, and one end of each of the blade turning arms is connected to the blade adjusting disk, and the other end is connected to each fan blade. The fan blade adjusting device according to claim 1, wherein the first connecting member is a first bevel gear and the second connecting member is a second bevel gear. The fan blade adjusting device according to claim 2, wherein said second transmission member comprises an axial moving sleeve, a rotating spacer disk and a push-pull rod; said axial moving sleeve is connected at one end to said first transmission member, and One end is fixed to the rotating spacer disk; the rotating spacer disk includes an isolated rotating bearing; the push-pull rod is connected at one end to the rotating spacer disk, and the other end is connected to the blade adjusting disk through the fan hub. The fan blade adjusting device according to claim 3, wherein the axial movement sleeve is disposed through the second bevel gear, and the outer surface of the axial movement sleeve is provided with an external thread, The two bevel gears are provided with internal threads that cooperate with the external threads. The fan blade adjusting device according to claim 3, wherein the axial movement sleeve is disposed through the second bevel gear, and the axial movement sleeve outer surface is fixed with a first rack, the second The bevel gear is provided with a first gear that cooperates with the first rack; and the second bevel gear is provided with a predetermined structure that drives the rotation of the first gear. The fan blade adjusting device according to claim 5, wherein the second bevel gear is provided with an inner hole parallel to the fan shaft, and the predetermined structure is a hole disposed in the inner hole of the second bevel gear The first gear cooperates with the inner helical teeth. The fan blade adjusting device according to claim 3, wherein said axial moving sleeve is fixed to said rotary spacer by a shaft retaining ring. The fan blade adjusting device according to claim 2, wherein said fan blade adjusting device further comprises a bushing sleeved on said fan shaft and configured to separate said second transmission member from said fan shaft . The fan blade adjusting device according to any one of claims 1 to 8, wherein the fan blade adjusting device further includes a blade adjusting angle indicating member, the blade adjusting angle indicating member including a second transmitting member The angle of the axial movement and the rotation indicates the shaft; the end of the angle indicating shaft connecting the second transmission member is provided with a third connection assembly, and the second transmission member is provided with a fourth connection matching the third connection assembly Component. The fan blade adjusting device according to claim 9, wherein the third connecting member is a second gear, the fourth connecting member is a second rack; and the blade adjusting angle indicating member is in the fan case There are tick marks on the outside. A counter-rotating axial flow fan comprising a fan casing, a front stage impeller and a rear stage impeller, wherein the front stage impeller and the rear stage impeller each comprise a fan shaft, a fan hub and a fan blade, and the front stage impeller includes a front stage a fan blade adjusting device, the rear stage impeller includes a rear stage fan blade adjusting device; the front stage fan blade adjusting device and the rear stage fan blade adjusting device respectively comprise a driving rod and a transmission Parts and blade adjustment discs; The driving rod includes a driving end and a connecting end, the driving end is located outside the fan casing, and the connecting end of the driving rod is connected to the transmission component through the fan casing, and the connecting end of the driving rod Providing a first connecting component that connects the transmission component; The transmission component is sleeved on the fan shaft, and includes a first transmission component that can rotate with the rotation of the drive rod and can move axially along the fan shaft along with rotation of the first transmission component a second transmission component; the first transmission component includes a second connection component that mates with the first connection component of the drive rod; the second transmission component is coupled to the first transmission component at one end; The blade adjustment disk is sleeved on the fan shaft and penetrates into a fan hub, and the blade adjustment disk can move axially with the axial movement of the second transmission component; Each of the blade turning arms is circumferentially connected, and one end of each of the blade turning arms is connected to the blade adjusting disk, and the other end is connected to each fan blade. The counter-rotating axial fan according to claim 11, wherein a driving rod of the front stage fan blade adjusting device is sleeved on a driving rod of the rear stage fan blade adjusting device; the first connecting component is a first bevel gear, the second connecting component is a second bevel gear; a first bevel gear of the front stage fan blade adjusting device and a first bevel gear of the rear stage fan blade adjusting device at the driving rod The axial distance is preset by a distance; the second bevel gear of the front stage fan blade adjusting device and the second bevel gear of the rear stage fan blade adjusting device are axially spaced apart by a predetermined distance of the fan shaft of the rear stage impeller . The counter-rotating axial fan according to claim 12, wherein the second transmission members of the front stage fan blade adjusting device and the rear stage fan blade adjusting device each comprise an axial moving sleeve, a rotating spacer disk and a push-pull rod; One end of the axial moving sleeve is connected to the first transmission component, and the other end is fixed to the rotating isolation disc; the rotating isolation disc comprises an isolated rotating bearing; one end of the push-pull rod is fixed to the rotating isolation disc, The other end is connected to the blade adjustment disk through the fan hub. The counter-rotating axial fan according to claim 13, wherein the axial moving sleeve of the front stage fan blade adjusting device and the axial moving sleeve of the rear stage fan blade adjusting device are each provided with at least two The axially moving sleeves are offset from each other in the circumferential direction of the fan shaft and do not affect the movement of the other axial movement sleeve. The counter-rotating axial fan according to claim 14, wherein an axial movement of the front stage fan blade adjusting device is passed through a second bevel gear of the front stage fan blade adjusting device, and the shaft An external thread is provided to the outer surface of the moving sleeve, and the second bevel gear is provided with an internal thread that cooperates with the external thread. The counter-rotating axial fan according to claim 14, wherein an axial movement of the rear stage fan blade adjusting device is passed through a second bevel gear of the rear stage fan blade adjusting device, and the shaft Fixing a first rack to an outer surface of the moving sleeve, the rear stage fan blade adjusting device is provided with a first gear that cooperates with the first rack; and the second tapered gear is provided to cooperate with the first gear Internal helical teeth. A counter-rotating axial fan according to claim 13, wherein the rotary isolating disk of the front stage fan blade adjusting device comprises a first rotating spacer disk disposed between the driving mechanism and the rear stage fan a second rotating isolating disc disposed between the rear stage impeller and the front stage impeller; the push rod of the front stage fan blade adjusting device is connected to the first rotating partitioning disc at one end, and the other end passes through the rear a fan hub of the stage impeller is connected to the second rotating isolating disk; a first rotating isolating disk of the front stage fan blade adjusting device and a rotating isolating disk of the rear stage fan blade adjusting device, the rear stage impeller The axial distance of the fan shaft is preset by the distance. The counter-rotating axial fan according to claim 17, wherein one end of the second rotating spacer disk is connected to the push-pull rod of the front stage fan blade adjusting device, and the other end is connected to the blade of the front stage fan blade adjusting device. The second rotating spacer disk is provided with an isolated rotating bearing at the front stage impeller fan shaft and the rear stage impeller fan shaft. A counter-rotating axial fan according to claim 17, wherein said second rotating partition The disc also includes a limiting rod connected to the fan casing, the limiting rod is connected to the second rotating partitioning disc at one end, and the fan shell is connected to the other end; the limiting rod can only be in the wind The casing moves axially. A counter-rotating axial fan according to claim 18, wherein the blade adjustment disk of the preceding stage fan blade adjustment device is provided with a return spring that restores the position of the blade adjustment disk. The counter-rotating axial fan according to claim 13, wherein the axial moving sleeves of the front stage fan blade adjusting device and the rear stage fan blade adjusting device are each fixed to the rotating spacer disk by a shaft retaining ring. The counter-rotating axial fan according to claim 13, wherein the counter-rotating axial fan is provided with a fan shaft sleeved on the rear stage impeller, and is configured to be spaced apart from the front stage fan blade. A sleeve of the second transmission component of the device and the downstream fan blade adjustment device in contact with the fan shaft of the rear stage impeller. A counter-rotating axial fan according to any one of claims 11 to 22, wherein the fan blade adjusting device further includes a blade adjusting angle indicating member, the blade adjusting angle indicating member including the second transmission An angle of rotation of the member and an angle of rotation indicates a shaft; the end of the angle indicating shaft connecting the second transmission member is provided with a third connection assembly, and the second transmission member is provided with a portion matching the third connection assembly Four connection components. A counter-rotating axial fan according to claim 23, wherein said third connecting member is a second gear, said fourth connecting member is a second rack; said blade adjusting angle indicating member is in said wind There are tick marks on the outside of the case.

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