A damper for a fan having a pneumatic actuator

Abstract

A fan damper with pneumatic execution device, including box, air duct, valve plate shaft, valve plate, cylinder and electromagnetic valve, the piston push rod in the cylinder is fixedly connected with the slider which is slidingly arranged on the cylinder support, the piston push rod outputs power to the valve plate shaft through the slider and linkage mechanism, the other end of the piston push rod is provided with a magnetic ring, a plurality of magnetic switches are arranged outside the cylinder body, each magnetic switch corresponds to an opening angle of the damper valve plate, when the magnetic ring on the piston in the cylinder moves to the position of a magnetic switch, the magnetic switch outputs a feedback signal, and the opening angle of the damper is kept unchanged in the current state through the electromagnetic valve control. The scheme controls the damper to keep any air volume in the pneumatic state through the cooperation of the cylinder, the magnetic switches corresponding to the opening angle of the corresponding valve plate and the electromagnetic valve; has the characteristics of stable operation, synchronous opening of the valve plate and convenient remote automatic control.

Description

Technical Field

[0001] This invention relates to the field of wind turbine control system technology, specifically to a wind turbine damper with a pneumatic actuator. Background Technology

[0002] Currently, fan dampers, as common fan accessories, are devices used to regulate fan airflow and speed. During fan startup, to prevent overload of the fan's motor current, the damper needs to be partially closed. Once stable, the damper is gradually opened, and its open / closed status needs to be monitored after the fan has started normally. Furthermore, fans operate in conjunction with a piping network. If the resistance of the piping system remains stable during operation, the fan will also operate stably under certain conditions. However, in actual production, the resistance of the piping network frequently changes. Fan performance adjustment involves modifying the damper opening size based on these changes in piping network performance to control fan airflow and meet production process requirements.

[0003] However, current fan dampers generally suffer from pneumatic actuators that can only open and close the damper. They cannot maintain a specific opening angle to achieve a designated ventilation volume, making remote automatic control impossible. Adjusting the ventilation volume requires manual manipulation of the handle on-site, which is time-consuming and labor-intensive. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a fan regulating damper with a pneumatic actuator.

[0005] The technical solution adopted in this invention is: a fan damper with a pneumatic actuator, comprising a housing, an air duct disposed within the housing, a valve plate shaft, a valve plate, and a power unit. The power unit includes a cylinder, a cylinder bracket, a solenoid valve, and several air pipes. The cylinder is mounted on the housing via the cylinder bracket. An external pressure air source is connected to the cylinder via the solenoid valve and air pipes. One end of the piston rod inside the cylinder is fixedly connected to a slider slidably disposed on the cylinder bracket. The piston rod outputs power to the valve plate shaft via the slider and a linkage mechanism. A magnetic ring is installed at the other end of the piston rod. Several magnetic switches are provided outside the cylinder body. Each magnetic switch corresponds to an opening angle of the damper valve plate. When the magnetic ring on the piston inside the cylinder moves to the position of a certain magnetic switch, the magnetic switch outputs a feedback signal, which controls the opening angle of the damper to remain unchanged in the current state via the solenoid valve.

[0006] As a preferred embodiment, one end of the cylinder bracket is a support platform, and the other end has guide ribs on both sides of the frame. The guide ribs form a guide slot that slides with the slider.

[0007] As a preferred embodiment, the cylinder is fixed to the support platform, and a groove is provided on the outer surface of the cylinder body. Multiple magnetic switches are provided in the groove, and each magnetic switch corresponds to the opening angle of an air regulating valve plate.

[0008] As a preferred embodiment, the piston is equipped with a magnetic ring containing a permanent magnet. During piston movement, when the magnetic ring approaches one of the magnetic switches, the two springs inside the magnetic switch are magnetized and attract each other, the contacts close, the circuit continuity indicator light illuminates, and the magnetic switch sends an electrical signal to control the solenoid valve to complete the corresponding switching action, so that the piston rod of the cylinder stops moving and remains in the current position.

[0009] As a preferred embodiment, the solenoid valve is a three-position five-way medium-pressure solenoid valve.

[0010] As a preferred embodiment, the housing is a cuboid structure with a cylindrical air duct inside. Both ends of the air duct are fitted with connecting flanges, and the front and rear sides of the housing are connected to the outer walls of the air duct, respectively.

[0011] As a preferred embodiment, at least three parallel valve plate shafts are inserted between the upper and lower sides of the housing. One of them is the main valve plate shaft located in the center of the air duct, and the others are auxiliary valve plate shafts. The two ends of each valve plate shaft are fixed to the side wall of the housing through a bearing seat. A valve plate is fixedly connected to the part of the valve plate shaft inside the cylindrical air duct. The rotation of the valve plate shaft drives the opening of the valve plate to control the ventilation volume of the air damper.

[0012] As a preferred embodiment, a linkage mechanism is provided on one side of the housing. The cylinder outputs power and drives the valve plate shaft to move through the piston rod, slider, and linkage mechanism. A manual adjustment device is provided on the outer side of the housing opposite to the linkage mechanism, which can be used to adjust the opening angle of the air regulating valve plate.

[0013] As a preferred embodiment, the linkage mechanism includes several short support rods and several long support rods; one end of each short support rod is fixedly connected to one end of the valve plate shaft, and the other end is hinged to the long connecting rod and the short connecting rod through a bearing seat; one end of each long support rod is hinged to the center of the long connecting rod and the short connecting rod through a bearing seat, and the other end is hinged to the slider through a bearing seat.

[0014] As a preferred embodiment, the manual adjustment device includes a handle and an angle display panel. The handle is fixedly connected to the main valve plate shaft, and the angle display panel is fixed on the outer wall of the rectangular housing. The angle display panel is marked with scale lines from 0° to 90° to indicate the rotation angle of the handle and the valve plate of the damper linked thereto.

[0015] The beneficial effects of this invention are:

[0016] This solution, through innovative structural design, provides a fan damper with a pneumatic actuator. It utilizes a cylinder, several magnetic switches corresponding to the opening angles of the valve plates, and a solenoid valve. A magnetic ring, which works in conjunction with the magnetic switches, is mounted on the piston of the cylinder. When the magnetic ring moves to the position of a particular magnetic switch, the switch outputs a feedback signal, which, through the solenoid valve, controls the damper's opening angle to remain constant. This solution ensures that the cylinder push rod maintains its position before the solenoid valve coil is de-energized, and precise cylinder stroke positioning is achieved using the cylinder magnetic switches. The slider performs linear reciprocating motion within the guide slot, driving the damper's linkage device to control the opening size of the damper valve plate, thereby controlling the damper to maintain any ventilation volume in pneumatic mode. It features stable operation, synchronous valve plate opening, and convenient remote automatic control. Furthermore, the installation structure of the duct and housing is optimized, allowing for both direct circular connection to the fan inlet and stable installation of the valve plate shaft's bearing seat. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is the front view of the fan damper;

[0019] Figure 2 This is a schematic diagram of the pneumatic actuator for the fan damper;

[0020] Figure 3 This is a front view of the piston push rod inside the cylinder.

[0021] Figure 4 This is a top view of the fan damper;

[0022] Figure 5 for Figure 4 A magnified view of a portion of point I in the middle;

[0023] Figure 6 This is a bottom view of the fan damper;

[0024] Figure 7 for Figure 6 A magnified view of a portion of point II.

[0025] The markings in the diagram are: 1. Cylinder, 2. Cylinder bracket, 3. Magnetic switch, 311. 0° magnetic switch, 312. 30° magnetic switch, 313. 90° magnetic switch, 4. Solenoid valve, 5. Housing, 6. Air duct, 7. Valve plate shaft, 8. Piston push rod, 9. Magnetic ring, 10. Slider, 11. Bolt, 12. Air pipe, 13. Valve plate, 14. Bearing seat, 15. Short support rod, 16. Long support rod, 17. Long connecting rod, 18. Short connecting rod, 19. Handle, 20. Angle display panel. Detailed Implementation

[0026] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "a," "an," or "the," and similar words used in the specification and claims of this patent application do not express a limitation of quantity, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function.

[0028] Example 1

[0029] The following is in conjunction with the appendix Figure 1-7 The structure and working process of this embodiment are described in detail below:

[0030] See appendix Figure 1 , 2 As shown in Figure 3, a fan damper with a pneumatic actuator includes a cylinder 1, a cylinder bracket 2, a magnetic switch 3, a solenoid valve 4, a housing 5, an air duct 6, and a valve plate shaft 7. The cylinder 1 is fixedly mounted on the outer wall of the housing via the cylinder bracket 2. An external pressure air source is connected to the cylinder 1 via an air pipe 12 and a solenoid valve 4. The output action of the cylinder 1 is controlled by the solenoid valve 4. A piston push rod 8 is provided in the inner cavity of the cylinder 1. A magnetic ring 9 is provided at one end of the piston push rod 8, and the other end is fixedly connected to the slider 10 by bolts 11. One end of the cylinder bracket 2 is a support platform. The plane length of the support platform is greater than 2 / 3 of the cylinder body length of the cylinder 1. Guide protrusions are provided in the inner side frames of the other end. A guide slot is formed between the two guide protrusions. The guide slot and the two sides of the slider 10 form a guide fit. Controlling the fit gap can reduce the running resistance of the slider 10. The cylinder bracket 2 is fixed to the outer wall of the housing 5 by welding five support rods.

[0031] In this embodiment, the cylinder 1 is fixed on the support platform of the cylinder bracket 2. The outer surface of the cylinder body of the cylinder 1 is provided with a groove, and multiple magnetic switches 3 are provided in the groove. Each magnetic switch 3 corresponds to an opening angle of an air regulating valve plate 13, such as: 0° position, 30° position, 90° position, etc., where the 0° position is when the valve plate is in the closed state. An air pipe 12 is provided on the side of the cylinder body of the cylinder 1. The air pipe 12 is connected to the solenoid valve 4. The pressurized airflow output from the external pressurized air source is output to the inside of the cylinder 1 through the air pipe 12 and the flow channel of the solenoid valve 4. By switching the solenoid valve, the cylinder outputs the corresponding action.

[0032] In this embodiment, see Appendix Figure 5 As shown, the solenoid valve 4 is a three-position five-way medium-pressure solenoid valve. When the coil on side A is energized, the piston push rod 8 extends away from the A side of the solenoid valve 4. When the coil on side B is energized, the piston push rod 8 retracts towards the A side of the solenoid valve 4. When neither the coil on side A nor the coil on side B is energized, the piston push rod 8 remains in the position when the last coil is de-energized.

[0033] It should be noted that: a magnetic ring 9 with a permanent magnet is installed on the piston. During the piston's movement, when the magnetic ring 9 approaches one of the magnetic switches 3, the two springs inside the magnetic switch 3 are magnetized and attract each other, the contacts close, and the circuit continuity indicator light illuminates; when the piston push rod 8 moves and causes the magnetic ring 9 to move away from the magnetic switch 3, the springs demagnetize, the contacts open, and the indicator light goes out; when the contacts close or open, an electrical signal is emitted, which controls the solenoid valve 4 to complete the corresponding switching action, so that the piston push rod of the cylinder stops moving and remains in the current position, thereby achieving the purpose of feedback control.

[0034] For example: When the damper is at 0°, opening it to 30°, or opening it to 90°, the specific operating procedure is as follows:

[0035] When the damper is at 0°, the damper is completely closed, the cylinder piston is fully retracted, the coils on sides A and B of solenoid valve 4 are de-energized, the indicator light of 0° magnetic switch 311 is lit, the pressure port P of solenoid valve 4 is in the open state, and the exhaust ports R1 and R2 are in the closed state.

[0036] The damper is opened to 30°:

[0037] When the coil on side A of solenoid valve 4 is energized, the pressure port P of solenoid valve 4 is in the open state, the exhaust port R1 is in the closed state, and the exhaust port R2 is in the open state. The piston rod 8 of the cylinder extends away from the A side of solenoid valve 4. The indicator light of magnetic switch 311 at the 0° position is off. When the magnetic ring 10 on the piston rod 8 of the cylinder moves to the 30° magnetic switch 312 position, the indicator light of 30° magnetic switch 312 lights up, and the coil on side A of solenoid valve 4 is de-energized. At this time, the pressure port P of solenoid valve is still in the open state, the exhaust ports R1 and R2 are in the closed state, and the piston rod 8 of the cylinder stops moving and remains in the current position.

[0038] The damper opens to 90°:

[0039] When the coil on side A of solenoid valve 4 is energized, the pressure port P of solenoid valve 4 is open, the exhaust port R1 is closed, and the exhaust port R2 is open. The piston rod 8 of the cylinder extends away from the A side of solenoid valve 4, and the indicator light of the 30° magnetic switch 312 goes out. When the magnetic ring 10 on the piston rod 8 of the cylinder moves to the 90° magnetic switch 313, the indicator light of the 90° magnetic switch 313 lights up, the coil on side A of solenoid valve 4 is de-energized, the pressure port P of solenoid valve is open, the exhaust ports R1 and R2 are closed, and the piston rod 8 of the cylinder stops moving and remains in the current position; the reverse is true.

[0040] See appendix Figure 1 As shown, the housing 5 is a cuboid structure with a cylindrical air duct 6 inside. Both ends of the air duct 6 are equipped with connecting flanges. The front and rear sides of the housing 5 are connected to the outer side walls of the air duct 6, respectively. At least three parallel valve plate shafts 7 are inserted between the upper and lower sides of the housing 5. One of the valve plate shafts in the center of the air duct 6 is the main valve plate shaft, and the others are auxiliary valve plate shafts. Both ends of each valve plate shaft 7 are fixed to the side of the housing 6 by a bearing seat 14. A valve plate 13 is fixedly connected to the part of the valve plate shaft 7 inside the cylindrical air duct 6. The rotation of the valve plate shaft 7 drives the opening of the valve plate 13 to control the ventilation volume of the damper.

[0041] See appendix Figure 4 As shown, a linkage device is provided on the upper side of the housing 5. The linkage device includes several short support rods 15 and several long support rods 16. One end of each short support rod 15 is fixedly connected to one end of the valve plate shaft 7, and the other end is hinged to the long connecting rod 17 and the short connecting rod 18 through the bearing seat 14. One end of each long support rod 16 is hinged to the center of the connecting rods 17 and 18 through the bearing seat 14, and the other end is hinged to the slider 10 through the bearing seat 14. The entire linkage device is activated by the retraction of the piston push rod 8 of the cylinder, which causes the slider 10 to move back and forth in a linear motion, driving the long support rod 16, the long connecting rod 17, and the short connecting rod 18 to move synchronously, thereby realizing the linkage of the short support rods 15.

[0042] See appendix Figure 6 and Figure 7 As shown, a manual adjustment device is provided on the outer side of the housing 5 opposite to the linkage device. The manual adjustment device includes a handle 19 and an angle display dial 20. The handle 19 is fixedly connected to the main valve plate shaft, and the angle display dial 20 is fixed on the outer wall of the rectangular housing 5. The angle display dial 20 is marked with scale lines from 0° to 90° to indicate the rotation angle of the handle 19 and the valve plate 13 of the damper linked with it. For example, when the valve plate 13 of the damper is fully open, the circular hole on the handle 19 coincides with the corresponding hole of the 90° scale line on the angle display dial 20. When the valve plate 13 of the damper is fully closed, the circular hole on the handle 19 coincides with the corresponding hole of the 0° scale line on the angle display dial 20. In manual adjustment mode, the opening size of the damper valve plate 13 can be adjusted by inserting a pin or bolt into the hole of the handle 19 and the corresponding hole of the angle display dial 20.

[0043] The parts not described in detail in this embodiment are existing technologies.

[0044] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A damper for a fan having a pneumatic actuator, comprising a housing, an air duct arranged in the housing, a valve plate shaft, a valve plate and a power unit, characterized in that: The power unit comprises a cylinder, a cylinder support, an electromagnetic valve and several air pipes, the cylinder is installed on the box through the cylinder support, an external pressure source is connected with the cylinder through the electromagnetic valve and the air pipes, one end of a piston push rod in the cylinder is fixedly connected with a sliding block slidingly arranged on the cylinder support, the piston push rod outputs power to the valve plate shaft through the sliding block and the linkage mechanism, the other end of the piston push rod is provided with a magnetic ring, a plurality of magnetic switches are arranged outside the cylinder body, each magnetic switch corresponds to an opening angle of the damper valve plate, when the magnetic ring on the piston moves to the position of a magnetic switch, the magnetic switch outputs a feedback signal, the electromagnetic valve controls the opening angle of the damper valve to keep unchanged in the current state; the electromagnetic valve is a three-position five-way medium pressure electromagnetic valve; One end of the cylinder support is a support platform, the other end is provided with guide protruding ribs in the two side frames, a guide slot in sliding fit with the sliding block is formed between the two guide protruding ribs, the guide slot is in guide fit with the two sides of the sliding block, the control fit clearance can adjust the resistance of the sliding block in operation; the piston is provided with a magnetic ring of a permanent magnet, when the magnetic ring approaches one of the magnetic switches during the movement of the piston, the two reeds in the magnetic switch are magnetized and attracted to each other, the contact is closed, the circuit is conducted and the indicator light is turned on, at the same time, the magnetic switch sends an electric signal and controls the electromagnetic valve to complete the corresponding switching action, so that the piston push rod of the cylinder stops moving and keeps in the current position; the box is a cuboid structure, a cylindrical air duct is arranged in the box, connecting flanges are arranged at the two ends of the air duct, the front and rear sides of the box are connected with the outer side walls of the air duct; at least three valve plate shafts parallel to each other are arranged between the upper and lower sides of the box, one of which is a main valve plate shaft and the others are auxiliary valve plate shafts, the two ends of each valve plate shaft are fixedly connected with the side walls of the box through a bearing seat, a valve plate is fixedly connected with the part of the valve plate shaft in the cylindrical air duct, the rotation of the valve plate shaft drives the opening of the valve plate to control the ventilation volume of the damper valve; a linkage mechanism is arranged on one side of the box, the cylinder outputs power, the piston push rod, the sliding block and the linkage mechanism drive the valve plate shaft to act, a manual adjusting device is arranged on the side of the box opposite to the linkage mechanism, the opening angle of the damper valve plate can be adjusted through the manual adjusting device; the linkage mechanism comprises a plurality of short connecting rods and a plurality of long connecting rods; one end of each short connecting rod is fixedly connected with one end of the valve plate shaft, the other end is hingedly connected with the long connecting rod and the short connecting rod through a bearing seat; one end of the long connecting rod is hingedly connected with the center of the long connecting rod and the short connecting rod through a bearing seat, the other end is hingedly connected with the sliding block through a bearing seat; the manual adjusting device comprises a handle and an angle display disc, the handle is fixedly connected with the main valve plate shaft, the angle display disc is fixedly connected with the outer side wall of the rectangular box, and the angle display disc is marked with a scale line of 0°-90° angle for indicating the rotation angle of the handle and the valve plate of the damper valve linked with the handle.

2. A damper according to claim 1, wherein: The air cylinder is fixed on the support platform, a groove is arranged on the outer surface of the cylinder body of the air cylinder, and a plurality of magnetic switches are arranged in the groove, and each magnetic switch corresponds to an opening angle of the air register valve plate.

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