A fire damper actuator

Abstract

The utility model discloses a fire damper actuator, comprising a shell, a base plate is arranged in the shell, a main shaft is passed through the base plate, the end of the main shaft is connected to a first drive device, the output end of the first drive device is connected to a reduction gear group, a limiting plate is coaxially connected to the main shaft, a hook cam is coaxially fixedly connected to the main shaft, and a second drive device and a first hook are respectively arranged on both sides of the hook cam. In the utility model, a motor rotation control device is added to control the forward and reverse switching of the motor to be delayed for a certain time, and the time can be adjusted according to actual needs, so that the error of product parts or the cumulative error of product assembly can be ignored, and a time difference is artificially created between the interlocking action of the first and second hooks and the reset action of the driving gear to avoid the actuator being unable to normally control the opening and closing of the valve due to the inability to accurately synchronize the actions of the two.

Description

Technical Field

[0001] The utility model relates to the field of fire protection equipment, in particular to a fire damper actuator. Background Art

[0002] Fire damper actuator: installed on the supply and return air ducts of ventilation and air conditioning systems, usually in the open state (normally open). When the gas temperature in the pipeline reaches a certain temperature during a fire, the fusible piece melts and the valve automatically closes under the action of the torsion spring force. It can meet the requirements of fire resistance stability and fire resistance integrity within a certain period of time and play the role of smoke and fire barrier. When the valve is closed, a closing signal is output. The working state of the actuator is generally defined as follows: normally open valve, the actuator drives the valve to open is called reset, and the actuator drives the valve to close is called action. In the existing actuators, such as the fully automatic fire damper actuator disclosed in patent announcement number: CN 212839651 U, and a fire damper actuator disclosed in CN 212080308 U, both of them complete the electric reset of the actuator by driving related components through the built-in motor of the actuator. The specific form is that the motor drives the gear module. After several mechanical actions, the two hooks inside the actuator are interlocked. At the same time, the micro switch is triggered by one of the hooks, and the control motor continues to drive the gear module to reset and rotate until the actuator reset action is completed and the motor stops working. However, during the actual production and use of the actuator, due to the existence of the actuator parts' own errors and the assembly cumulative errors, the following phenomenon may occur: the interlocking action of the two hooks and the action of one of the hooks triggering the micro switch cannot meet the design "synchronization" requirements, that is, one of the hooks has triggered the micro switch at the moment before the two hooks are interlocked, causing the motor to drive the gear module to reset in advance before the two hooks are interlocked, so that the two hooks cannot complete the interlocking, causing the entire actuator to fail to operate normally. Utility Model Content

[0003] In order to solve the above technical problems, the utility model discloses a fire damper actuator, comprising a shell, a bottom plate is arranged inside the shell, a main shaft is arranged on the bottom plate, a first driving device is connected to the end of the main shaft, a reduction gear set is connected to the output end of the first driving device, a limiting plate is coaxially connected to the main shaft, a columnar block is arranged on the limiting plate, a driving gear passes through the main shaft, an arc groove is arranged on the surface of the driving gear, the columnar block is stuck in the arc groove, the end gear of the reduction gear set is meshed with the driving gear coaxially passing through the main shaft, and the driving gear rotates to drive the main shaft to rotate by toggling the columnar block;

[0004] A torsion spring is sleeved on the main shaft, and a free end of the torsion spring is clamped on a limit stopper fixed on the bottom plate;

[0005] The main shaft is coaxially fixedly connected with a hook cam, and a second driving device and a first hook are respectively arranged on both sides of the hook cam, and the output end of the second driving device is connected with a second hook, and the middle part of the second hook is connected to the bottom plate through a shaft column, and the second driving device pushes or pulls back the end of the second hook;

[0006] One end of the first hook is connected to the bottom plate through a shaft column, and the other end is provided with a spring, the spring is in a stretched state, pulling the end of the first hook to rotate in the direction of the first driving mechanism; a first micro switch is provided within the rotation displacement range of the first hook;

[0007] When the hook cam rotates with the main shaft, the first hook is moved. When the first hook is stuck in the groove of the cam, the first hook is interlocked with the second hook, and the first micro switch, the second micro switch and the third micro switch are pressed at the same time. The first micro switch triggers a signal to control the first drive device to rotate and reset, the second micro switch conducts a wire of the electromagnet of the second drive device, and the third micro switch completes the conversion of the normally open and normally closed contacts;

[0008] The second driving device is used to pull the second hook to separate from the end of the first hook, and at the same time the torsion spring acts on the main shaft to drive the main shaft and the hook cam to reset.

[0009] Preferably, it also includes a single-chip microcomputer control circuit, which drives the first driving device to rotate, and adds a delay before the first driving device rotates and resets, and the delay is more than 0.2S.

[0010] Preferably, the first driving device includes a motor and a reducer assembly.

[0011] Preferably, the second driving device comprises an electromagnet, an iron core of the electromagnet is fixedly connected to the second hook, and a return spring is arranged on the iron core of the electromagnet.

[0012] Preferably, the hook cam comprises a central hole and a protrusion, and the groove is provided at the end of the protrusion.

[0013] Preferably, the first hook comprises an elongated plate body, the elongated plate body is a bent U-shaped structure, a hollow portion is formed in the middle, a ball is arranged in the hollow portion, and the cam is pressed on the ball when rotating.

[0014] Preferably, a second micro switch and a third micro switch are sequentially arranged above the first micro switch.

[0015] Preferably, a fourth micro switch is provided within the rotation displacement range of the first hook.

[0016] Preferably, the reduction gear group includes three groups of planetary gears meshing with the motor gears, a switch adjustment column is coaxially connected to one planetary gear, the switch adjustment column is located on the base plate, and a fifth micro switch is provided on the side of the switch adjustment column. When the driving gear is reset, the planetary gear meshing with it rotates with it, and when the switch adjustment column coaxially connected to the planetary gear and the fifth micro switch are released, the motor stops working and the actuator is reset.

[0017] Preferably, a manual reset device is provided on the top of the shell, the manual reset device is connected to the main shaft, and a manual control device is provided on one end of the second hook close to the first hook, and the manual control device extends out of the side wall of the shell.

[0018] The fire damper actuator proposed in the utility model has the following beneficial effects: in the utility model, by adding a motor rotation control device, the forward and reverse switching of the motor is controlled to be delayed for a certain time, and the time can be adjusted according to actual needs, so that the product parts error or the cumulative error of product assembly can be ignored, and the time difference is artificially created between the first and second hook interlocking actions and the driving gear reset action, so as to avoid the actuator being unable to normally control the opening and closing of the valve due to the inability to accurately synchronize the two actions. The utility model can not only improve the production efficiency of the product, but also minimize the failure rate of the product in actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0021] Figure 2 It is an internal schematic diagram of the utility model;

[0022] Figure 3 For the utility model Figure 2 The stereogram at a in the middle;

[0023] Figure 4 It is a three-dimensional diagram of the reduction gear set of the utility model;

[0024] Figure 5 It is a plan view of the reduction gear set of the utility model;

[0025] Figure 6 It is a schematic diagram of the driving gear of the utility model;

[0026] Figure 7 This is a schematic diagram of the working state change of the utility model;

[0027] Figure 8 It is a schematic diagram of the temperature sensor fuse device of the utility model;

[0028] Fig. 9 It is a schematic diagram of the temperature sensor fusing device of the utility model after fusing;

[0029] Among them, 1. base plate; 2. main shaft; 3. reduction gear set; 4. limit plate; 5. columnar block; 6. driving gear; 7. arc groove; 8. torsion spring; 9. limit baffle; 10. hook cam; 11. first hook; 12. second driving device; 13. second hook; 14. shaft column; 15. spring; 16. first micro switch; 17. groove; 18. motor; 19. reducer assembly; 20. reset spring; 21. protrusion; 22. ball; 23. second micro switch; 24. third micro switch; 25. motor gear; 26. planetary gear; 27. switch adjustment column; 28. fifth micro switch; 29. ​​manual reset device; 30. manual control device; 31. terminal; 32. housing; 33. temperature sensor fuse device. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] like Figure 1 , Figure 2 As shown, the utility model discloses a fire damper actuator, including a housing 32, a bottom plate 1 is arranged inside the housing 32, a main shaft 2 is passed through the bottom plate 1, and a reduction gear set 3 is arranged at the lower position of the bottom plate 1, and the main shaft 2 is driven to rotate by a first driving device (a configuration of a motor 18 and a reducer is selected in this embodiment) connected to the end of the main shaft 2, wherein the reduction gear set 3 includes three sets of planetary gears 26 that mesh with the gears of the motor 18;

[0032] The main shaft 2 is coaxially connected to a limiting plate 4, and the limiting plate 4 is provided with a columnar block 5. Figure 4-Figure 6As shown, the main shaft 2 is provided with a driving gear 6, which meshes with the last group of the aforementioned planetary gears 26 and is driven by the same. The driving gear 6 is provided with an arc groove 7 on its surface, and the cylindrical block 5 is stuck in the arc groove 7. The end gear of the reduction gear set 3 meshes with the driving gear 6 coaxially passing through the main shaft 2. The driving gear 6 rotates, and the arc groove 7 on the driving gear 6 rotates relative to the cylindrical block 5 therein. When the cylindrical block 5 reaches the end of the arc groove 7, it can drive the limit plate 4 to rotate together with the main shaft 2. Such a design can facilitate the resetting of the reduction gear. When the motor 18 is reset and reversed, the driving gear 6 reverses, and the end of the arc groove 7 moves away from the cylindrical block 5. The reduction gear set 3 is reversed and will not drive the main shaft 2 to rotate. Because at this time, the hook cam 10 set on the main shaft 2 above the base plate 1 is in place, and the first hook 11 and the second hook 13 are interlocked, which will be described in detail below.

[0033] like Figure 2 , Figure 3 As shown, the main shaft 2 is coaxially fixedly connected with a hook cam 10, and the hook cam 10 is located above the base plate 1. The second driving device 12 and the first hook 11 are respectively arranged on both sides of the hook cam 10, and the output end of the second driving device 12 is connected with the second hook 13. In this embodiment, the second driving device 12 uses an electromagnet, and the iron core of the electromagnet is connected to the second hook 13 through a turn pin. A reset spring 2015 is arranged on the output end of the electromagnet, and the reset spring 2015 is used to push the end of the second hook 13. The middle part of the second hook 13 is connected to the base plate 1 through a shaft column 14, and the second driving device 12 pushes or pulls back the end of the second hook 13; one end of the first hook 11 is connected to the base plate 1 through the shaft column 14, and the other end is provided with a spring 15, and the spring 15 is in a stretched state, pulling the end of the first hook 11 to rotate in the direction of the first driving mechanism; a first micro switch 16 is arranged at the rotation direction position of the first hook 11.

[0034] Since the structure of the hook cam 10 is a circular body, the edge of the circular body is provided with an arc-shaped protrusion 21 that occupies about 1 / 3 of the angle of the entire circular body, and the end of the arc-shaped protrusion 21 is provided with a groove 17, and the groove 17 is used to cooperate with the first hook 11. Specifically, when the hook cam 10 rotates with the main shaft 2, the arc-shaped protrusion 21 of the hook cam 10 is pressed on the side wall of the first hook 11, and because the hook cam 10 rotates, a torsion spring 8 is sleeved on the main shaft 2, and one free end of the torsion spring 8 is clamped on the limit stopper 9 fixed on the bottom plate 1, and the torsion spring 8 on the main shaft 2 contracts. At this time, the end of the first hook 11 is pressed against the end of the second hook 13, wherein the first hook 11 includes a long plate body, and the long plate body is a bent U-shaped structure with a hollow portion formed in the middle. A ball 22 is provided in the hollow portion, and the cam is pressed on the ball 22 when it rotates. The provision of the ball 22 makes it easier for the cam to rotate. The edge of the first hook 11 rotates, and at the same time, when the ball 22 reaches the groove 17 of the hook cam 10, it is stuck in the groove 17, and the end of the first hook 11 is not restricted by the cam and is pulled by the spring 15, so that the end of the first hook 11 rotates to the side close to the spring 15, and then gets stuck in the groove of the end of the second hook 13, and the first hook 11 is engaged with the second hook 13. The second hook 13 is pushed by the reset spring 2015 in the electromagnet section, so that the engaged position with the first hook 11 is maintained and will not be tilted, thereby limiting the first hook 11. At the same time, the first hook 11 rotates, pressing the first micro switch 16, the second micro switch 23 and the third micro switch 24. The first micro switch 16 triggers a signal to control the first drive device to rotate and reset, the second micro switch 23 turns on a wire of the electromagnet of the second drive device, and the third micro switch 24 completes the conversion of normally open and normally closed contacts.

[0035] However, due to product parts errors or product assembly cumulative errors, the interlocking action of the two hooks and the action of the first hook 11 triggering the first micro switch 16 cannot meet the design "synchronization" requirement. The first hook 11 has not yet interlocked with the second hook 13, but it has first contacted the first micro switch 16, causing the motor 18 to reset in advance. However, because the hooks have not yet interlocked, the rotation of the motor 18 will drive the cam to rotate in the opposite direction, driving the first hook 11 to separate from the first micro switch 16, and the first micro switch 16 will return to the untriggered state, and the motor 18 will resume forward rotation, which will cause the motor 18 to rotate back and forth, causing the equipment to It cannot be used. A single-chip control circuit is specially added. The single-chip control circuit drives the first driving device to rotate, and before the first driving device rotates and resets, a delay is added. The delay is more than 0.2S. In this embodiment, it is set to 0.4S. The time length can be adjusted according to actual conditions. After the delay is added, after pressing the first micro switch 16, the motor 18 delays a certain time to reverse and reset, but continues to rotate in the original direction, so that the first hook 11 can completely hook the end of the second hook 13 to complete the interlocking, which eliminates the equipment failure caused by product parts errors or product assembly cumulative errors. Then the motor 18 is reset again. The principle of the motor 18 driving the reduction gear set 3 to reset has been described in the first paragraph of this embodiment and will not be repeated here.

[0036] It should be noted that:

[0037] A switch adjustment column 27 is coaxially connected to a planetary gear 26, and the switch adjustment column 27 is located on the base plate 1. A fifth micro switch 28 is provided on the side of the switch adjustment column 27. When the driving gear 6 is reset, the planetary gear 26 meshing therewith rotates therewith. When the switch adjustment column 27 coaxially connected to a planetary gear 26 is released from the fifth micro switch, the motor stops working and the actuator reset is completed.

[0038] The following is a complete description of the entire process of the device:

[0039] See also Figure 7:The initial state is such as state A, that is, the actuator is not reset, the valve is closed, the end of the first hook 11 is against the end of the second hook 13, and the two are not interlocked. At this time, the actuator can be reset in two ways: 1. A terminal 31 is provided on the side of the housing 32. The terminal 31 consists of 9 terminals. The reset power supply is connected to the designated two terminals. The single-chip microcomputer controls the first drive device to drive the reduction gear set 3 to rotate, thereby driving the main shaft 2 and the hook cam 10 on the main shaft 2 to rotate. At this time, due to the effect of the spring 15 of the first hook 11, when the groove 17 position of the hook cam 10 contacts the ball 22 of the first hook 11, the first hook 11 is pulled to the groove position of the end of the second hook 13, and is engaged with the end of the second hook 13 to complete the interlocking. The device is in a reset state, and the valve connected to the device is in an open state. After the first hook 11 and the second hook 13 are connected, the motor 18 drives the reducer gear to continue to reset and rotate until the actuator completes the reset and stops. The purpose of the rotation is to ensure that the main shaft 2 can move to the initial position, that is, the valve connected to the equipment can be closed.

[0040] 2. A manual reset device 29 is provided on the top of the housing 32. The manual reset device 29 is provided on the top of the housing 32. The manual reset device 29 is connected to the main shaft 2. The manual reset device 29 can be manually pulled to drive the main shaft 2 to rotate until the first hook 11 and the second hook 13 are interlocked, and the ball 22 of the first hook 11 is released when it is stuck in the groove 17 of the hook cam 10. At this time, the actuator is reset.

[0041] When the valve is in the reset state, there are three ways to make the actuator work, that is, the valve is closed. 1. Manually input power to the two designated terminals on the terminal 31, turn on the power to start the second drive device, pull back the electromagnet core of the second drive device, and then pull the end of the second hook 13 to move in the direction of the second drive device. Since the second hook 13 is installed on the shaft column 14, the other end will be separated from one end of the first hook 11. Since the first hook 11 loses the restriction of the second hook 13, the hook cam 10 will be separated from the restriction of the ball 22 in the first hook 11, causing the main shaft 2 and the hook cam 10 to reset under the action of the torsion spring 8. When the cam is reset, it will push the first hook 11 to move, causing it to press on the fourth micro switch, and the rotation of the main shaft 2 will drive the valve connected to the main shaft 2 to close.

[0042] 2. A manual control device 30 is provided on one side of the second hook 13 close to the first hook 11. The manual control device 30 extends out of the side wall of the shell 32. The manual control device 30 is connected to the end of the second hook 13 and extends out of the shell 32. By manually pulling, the first hook 11 is separated from the second hook 13, and the hook cam 10 is freed from the restriction of the ball 22 in the first hook 11, so that the main shaft 2 and the hook cam 10 are reset under the action of the torsion spring 8. When the cam is reset, it will push the first hook 11 to move and press it on the fourth micro switch. The rotation of the main shaft 2 will drive the valve connected to the main shaft 2 to close.

[0043] 3. A temperature sensor fuse device 33 is also provided, such as Figure 8 , Fig. 9 As shown, the temperature sensor fuse device 33 includes a vertical rod body 34 passing through the base plate 1, and the outer wall of the vertical rod body 34 is provided with a thread 35, which is locked and connected to the base plate 1 through the thread 35. The vertical rod body 34 is a hollow structure, and a telescopic rod 37 is inserted into the vertical rod. A conical cap 38 is provided on the top of the telescopic rod 37, and a baffle is provided at the bottom. An elastic member 36 is provided between the baffle and the vertical rod body 34, and the elastic member 36 is in a compressed state. A fuse part is provided at the lower part of the vertical rod body 34, and a support sheet 39 is connected to the bottom of the fuse part through a positioning nail. The support sheet 39 can rotate on the positioning nail, and the end of the support sheet 39 is pressed on the baffle, and is connected to the fuse part through a hot melt material, and the conical cap 38 is positive. The normal state is located at and on the upper part of the second hook 13. When there is a fire close to the temperature trigger, the hot melt material melts, the support sheet 39 loosens, and loses its supporting effect on the vertical rod. The elastic member 36 resets, and the conical cap 38 at the top of the temperature sensor of the fuse part instantly goes down and collides with the second hook 13. The force generated causes one end of the second hook 13 to move, causing the first hook 11 to separate from the second hook 13, and the hook cam 10 will break away from the restriction of the ball 22 in the first hook 11, causing the main shaft 2 and the hook cam 10 to reset under the action of the torsion spring 8. When the cam resets, it will push the first hook 11 to move and press it on the fourth micro switch. The rotation of the main shaft 2 will drive the valve connected to the main shaft 2 to close.

Claims

1. A fire damper actuator, characterized in that: The invention comprises a housing (32), wherein a bottom plate (1) is provided inside the housing (32), a main shaft (2) is passed through the bottom plate (1), a first driving device is connected to the end of the main shaft (2), an output end of the first driving device is connected to a reduction gear set (3), a limiting plate (4) is coaxially connected to the main shaft (2), a columnar block (5) is provided on the limiting plate (4), a driving gear (6) passes through the main shaft (2), an arc groove (7) is provided on the surface of the driving gear (6), the columnar block (5) is clamped in the arc groove (7), the end gear of the reduction gear set (3) is meshed with the driving gear (6) coaxially passed through the main shaft (2), and the driving gear (6) rotates to drive the main shaft (2) to rotate by shifting the columnar block (5); The main shaft (2) is sleeved with a torsion spring (8), and a free end of the torsion spring (8) is clamped on a limit stopper (9) fixed on the bottom plate (1); The main shaft (2) is coaxially fixedly connected with a hook cam (10), and a second driving device (12) and a first hook (11) are respectively arranged on both sides of the hook cam (10), and the output end of the second driving device (12) is connected with a second hook (13), and the middle part of the second hook (13) is connected to the bottom plate (1) through a shaft column (14), and the second driving device (12) pushes or pulls back the end of the second hook (13); One end of the first hook (11) is connected to the bottom plate (1) via a shaft column (14), and the other end is provided with a spring (15), wherein the spring (15) is in a stretched state and pulls the end of the first hook (11) to rotate in the direction of the first driving mechanism; a first micro switch (16) is provided within the rotation displacement range of the first hook (11); When the hook cam (10) rotates with the main shaft (2), the first hook (11) is moved. When the first hook (11) is stuck in the groove (17) of the cam, the first hook (11) is interlocked with the second hook (13), and the first micro switch, the second micro switch and the third micro switch are pressed at the same time. The first micro switch triggers a signal to control the first drive device to rotate and reset, the second micro switch conducts a wire of the electromagnet of the second drive device, and the third micro switch completes the conversion of normally open and normally closed contacts. The second driving device (12) is used to pull the second hook (13) to separate from the end of the first hook (11), and at the same time the torsion spring (8) acts on the main shaft (2) to drive the main shaft (2) and the hook cam (10) to reset.

2. The fire damper actuator according to claim 1, characterized in that: It also includes a single-chip microcomputer control circuit, which drives the first driving device to rotate, and adds a delay before the first driving device rotates and resets, and the delay is more than 0.2S.

3. The fire damper actuator according to claim 1, characterized in that: The first driving device comprises a motor (18) and a reducer assembly (19).

4. The fire damper actuator according to claim 1, characterized in that: The second driving device (12) comprises an electromagnet, the iron core of the electromagnet is movably connected to the second hook (13), and a return spring (20) (15) is arranged on the iron core of the electromagnet.

5. The fire damper actuator according to claim 1, characterized in that: The hook cam (10) comprises a central hole and a protrusion (21), and the end of the protrusion (21) is provided with the groove (17).

6. The fire damper actuator according to claim 1, characterized in that: The first hook (11) comprises a long plate body, the long plate body is a bent U-shaped structure, a hollow portion is formed in the middle, a ball (22) is arranged in the hollow portion, and the cam is pressed on the ball (22) when rotating.

7. The fire damper actuator according to claim 1, characterized in that: A second micro switch (23) and a third micro switch (24) are sequentially arranged above the first micro switch (16).

8. The fire damper actuator according to claim 1, characterized in that: A fourth micro switch is provided within the rotation displacement range of the first hook (11).

9. The fire damper actuator according to claim 1, characterized in that: The reduction gear set (3) comprises three sets of planetary gears (26) meshing with each other on the gears of the motor (18), a switch adjustment column (27) being coaxially connected to one of the planetary gears (26), the switch adjustment column (27) being located on the bottom plate (1), a fifth micro switch (28) being provided on the side of the switch adjustment column (27), when the driving gear is reset, the planetary gear meshing with the driving gear rotates with it, when the switch adjustment column coaxially connected to the planetary gear and the fifth micro switch are released, the motor stops working, and the actuator reset is completed.

10. The fire damper actuator according to claim 1, characterized in that: A manual reset device (29) is provided on the top of the housing (32), and the manual reset device (29) is connected to the main shaft (2). A manual control device (30) is provided at one end of the second hook (13) close to the first hook (11), and the manual control device (30) extends out of the side wall of the housing (32).

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