CN219570390U

CN219570390U - Leakage protection device of centrifugal fan

Info

Publication number: CN219570390U
Application number: CN202320438345.XU
Authority: CN
Inventors: 周贤周; 陈戍凯; 张�杰
Original assignee: Shanggu Turbo Draught Fan Qidong Co ltd
Current assignee: Shanggu Turbo Draught Fan Qidong Co ltd
Priority date: 2023-03-09
Filing date: 2023-03-09
Publication date: 2023-08-22
Anticipated expiration: 2033-03-09

Abstract

The utility model discloses a leakage protection device of a centrifugal fan, which comprises a base plate, wherein a fan housing is arranged at the top end of the base plate, an access door is arranged on one side of the fan housing, the access door is hinged with the fan housing, a fan motor is arranged on one side, far away from the access door, of the fan housing, a driving shaft of the fan motor extends into the fan housing to be connected with a centrifugal wind wheel, and a fixing groove is formed in one side, located on the access door, of the fan housing. The beneficial effects are that: through adding pressure sensor, PLC controller and outage subassembly when personnel open the access door, pressure sensor takes place numerical variation and gives the PLC controller with signal transmission, and the PLC controller makes fan motor and external power source disconnection through control outage subassembly, prevents that the personnel from leaking electric accidental injury personnel of fan motor shaft when the maintenance, further improves its security to outage subassembly drives the movable block through the lead screw and removes and make switch-on board one and switch-on board separation let its outage, makes it adjust more stable swiftly.

Description

Leakage protection device of centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a leakage protection device of a centrifugal fan.

Background

The centrifugal fan is a machine which increases the pressure of gas and discharges the gas by means of input mechanical energy, and is a driven fluid machine. Centrifugal fans are widely used for ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and induced draft of boilers and industrial kilns; cooling and ventilation in air-conditioning devices and household appliances; drying and selecting grains; the motor is used as a driving part of the centrifugal fan, an output shaft of the motor is driven to be connected with the centrifugal wind wheel, when the centrifugal wind wheel needs to be replaced or overhauled, a user needs to take down the centrifugal wind wheel from the output shaft of the motor, and the output shaft is exposed at the moment, so that the risk of electric shock exists.

According to the centrifugal fan with multistage leakage protection disclosed in Chinese patent CN201620413364.7, a connecting plate is fixed on a bottom plate body through the cooperation of bolts and gaskets; the electric leakage protection device comprises a penetrating bolt, an insulating sleeve, an insulating block and a bolt sheath, so that the electric leakage protection device has multistage electric leakage protection, the working stability is strong, the insulating sleeve is mostly sleeved on a motor shaft of the existing fan motor for protection, the existing centrifugal fan has the anti-creeping function by adding insulating parts such as insulating sleeves and insulating blocks, but personnel can touch the insulating sleeve on the driving shaft of the fan motor when the centrifugal wind wheel is replaced, so that the motor shaft is exposed due to movement of the insulating sleeve, and the safety is low.

For the problems in the related art, no effective solution has been proposed at present.

Disclosure of Invention

Aiming at the problems in the related art, the utility model provides a leakage protection device of a centrifugal fan, which aims to overcome the technical problems in the prior art.

For this purpose, the utility model adopts the following specific technical scheme:

the utility model provides a centrifugal fan earth leakage protection device, includes the base plate, the base plate top is equipped with the fan housing, fan housing one side is equipped with the access door, the access door with the fan housing is articulated, the fan housing is kept away from one side of access door is equipped with the fan motor, the fan motor drive shaft extends to be connected with centrifugal wind wheel in the fan housing, the fan housing is located the fixed slot has been seted up to one side of access door, be equipped with the connecting block in the fixed slot, the screw thread groove has been seted up to connecting block one side, access door one side be equipped with run through the access door and with screw thread groove assorted fastening bolt, just be located in the fixed slot the connecting block both ends are equipped with symmetrical pressure sensor that sets up, access door one side be equipped with pressure sensor assorted extrusion piece, the base plate top just is located fan housing one side is equipped with the regulating box, regulating box one side be equipped with the PLC controller, the regulating box top be equipped with the insulating sleeve that the fan motor is connected, be equipped with in the regulating box with the outage subassembly of fan motor looks adaptation.

Preferably, a rubber pad is arranged on one side of the extrusion block.

Preferably, the pressure sensor is connected with the PLC controller through a signal line.

Preferably, the power-off assembly comprises symmetrically arranged fixed plates arranged in the adjusting box, a screw rod is arranged between the two groups of fixed plates, a moving block is sleeved on the outer wall of the screw rod, a first connecting plate is arranged on one side of the moving block and connected with the moving block through a first insulating frame, a first contact is arranged on the top end of the first connecting plate, a second contact is arranged on the bottom end of the first connecting plate, a second connecting plate is arranged on the top end of the first contact, the second connecting plate is connected with the adjusting box through a second insulating frame, a third contact is arranged on the top end of the second connecting plate, a fourth contact is arranged on the bottom end of the second connecting plate, the second contact is connected with an external wire, an internal wire penetrating through the insulating sleeve and connected with a fan motor is arranged on the top end of the third contact, the first connecting plate is connected with a positive and negative motor through a control wire, and the positive and negative motor is connected with the PLC controller.

Preferably, the screw is connected with the fixing plate through a bearing.

Preferably, the moving block is provided with a threaded hole matched with the screw rod, one side of the moving block is provided with a limiting block, and the inner wall of the adjusting box is provided with a travel groove matched with the limiting block.

The beneficial effects of the utility model are as follows: through adding pressure sensor, PLC controller and outage subassembly when personnel open the access door, pressure sensor takes place numerical variation and gives the PLC controller with signal transmission, and the PLC controller makes fan motor and external power source disconnection through control outage subassembly, prevents that the personnel from leaking electric accidental injury personnel of fan motor shaft when the maintenance, further improves its security to outage subassembly drives the movable block through the lead screw and removes and make switch-on board one and switch-on board separation let its outage, makes it adjust more stable swiftly.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the overall structure of a leakage protection device for a centrifugal fan according to an embodiment of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a rear view of a centrifugal fan leakage protection device according to an embodiment of the present utility model;

fig. 4 is a sectional view of an adjusting box in a leakage protection device for a centrifugal fan according to an embodiment of the utility model.

In the figure:

1. a substrate; 2. a fan housing; 3. an access door; 4. a fan motor; 5. centrifugal wind wheel; 6. a fixing groove; 7. a connecting block; 8. a thread groove; 9. a fastening bolt; 10. a pressure sensor; 11. extruding a block; 12. an adjusting box; 13. a PLC controller; 14. an insulating sleeve; 15. a fixing plate; 16. a screw rod; 17. a moving block; 18. the first connecting plate is connected; 19. an insulating frame I; 20. a first contact; 21. a second contact; 22. the second connecting plate is connected; 23. an insulation frame II; 24. a third contact; 25. a contact fourth; 26. a forward and reverse motor; 27. a limiting block; 28. a travel groove.

Detailed Description

For the purpose of further illustrating the various embodiments, the present utility model provides the accompanying drawings, which are a part of the disclosure of the present utility model, and which are mainly used to illustrate the embodiments and, together with the description, serve to explain the principles of the embodiments, and with reference to these descriptions, one skilled in the art will recognize other possible implementations and advantages of the present utility model, wherein elements are not drawn to scale, and like reference numerals are generally used to designate like elements.

According to an embodiment of the utility model, a leakage protection device for a centrifugal fan is provided.

Embodiment one;

as shown in fig. 1-4, the leakage protection device for a centrifugal fan according to the embodiment of the utility model comprises a base plate 1, a fan housing 2 is arranged at the top end of the base plate 1, an access door 3 is arranged at one side of the fan housing 2, the access door 3 is hinged with the fan housing 2, a fan motor 4 is arranged at one side of the fan housing 2 far away from the access door 3, a driving shaft of the fan motor 4 extends to the fan housing 2 and is connected with a centrifugal wind wheel 5, a fixed groove 6 is formed in one side of the fan housing 2, a connecting block 7 is arranged in the fixed groove 6, a threaded groove 8 is formed in one side of the connecting block 7, a fastening bolt 9 penetrating through the access door 3 and matched with the threaded groove 8 is arranged at one side of the access door 3, pressure sensors 10 symmetrically arranged at two ends of the connecting block 7 are arranged in the fixed groove 6, an extrusion block 11 matched with the pressure sensors 10 is arranged at one side of the access door 3, an adjusting box 12 is arranged at one side of the base plate 1 and is arranged at one side of the fan housing 2, a controller 12 is arranged at one side of the adjusting box 12 is provided with the top end of the fan housing 4, and an electric insulation sleeve is connected with the fan 4 is arranged at the top end of the adjusting box 12.

Embodiment two;

as shown in fig. 1-4, the leakage protection device for a centrifugal fan according to the embodiment of the utility model comprises a base plate 1, a fan housing 2 is arranged at the top end of the base plate 1, an access door 3 is arranged at one side of the fan housing 2, the access door 3 is hinged with the fan housing 2, a fan motor 4 is arranged at one side of the fan housing 2 far away from the access door 3, a driving shaft of the fan motor 4 extends to the fan housing 2 and is connected with a centrifugal wind wheel 5, a fixed groove 6 is formed in one side of the fan housing 2, a connecting block 7 is arranged in the fixed groove 6, a threaded groove 8 is formed in one side of the connecting block 7, a fastening bolt 9 penetrating through the access door 3 and matched with the threaded groove 8 is arranged at one side of the access door 3, pressure sensors 10 symmetrically arranged at two ends of the connecting block 7 are arranged in the fixed groove 6, an extrusion block 11 matched with the pressure sensors 10 is arranged at one side of the access door 3, an adjusting box 12 is arranged at one side of the base plate 1 and is arranged at one side of the fan housing 2, a controller 12 is arranged at one side of the adjusting box 12 is provided with the top end of the fan housing 4, and an electric insulation sleeve is connected with the fan 4 is arranged at the top end of the adjusting box 12. A rubber pad is arranged on one side of the extrusion block 11. The pressure sensor 10 is connected with the PLC controller 13 through a signal line. The power-off assembly comprises symmetrically arranged fixed plates 15 arranged in an adjusting box 12, a screw rod 16 is arranged between the two groups of fixed plates 15, a moving block 17 is sleeved on the outer wall of the screw rod 16, a first connecting plate 18 is arranged on one side of the moving block 17, the first connecting plate 18 is connected with the moving block 17 through a first insulating frame 19, a first contact 20 is arranged at the top end of the first connecting plate 18, a second contact 21 is arranged at the bottom end of the first connecting plate 18, a second connecting plate 22 is arranged at the top end of the first contact 20, the second connecting plate 22 is connected with the adjusting box 12 through a second insulating frame 23, a third contact 24 is arranged at the top end of the second connecting plate 22, a fourth contact 25 is arranged at the bottom end of the second contact 21 and connected with an external wire, an internal wire penetrating through the insulating sleeve 14 and connected with a fan motor 4 is arranged at the top end of the third contact 24, a group of the fixed plate 15 is connected with a positive and negative motor 26 through a control wire, and the positive and negative motor 26 is connected with the PLC controller 13. The screw 16 is connected with the fixing plate 15 through a bearing. The moving block 17 is provided with a threaded hole matched with the screw rod 16, one side of the moving block 17 is provided with a limiting block 27, and the inner wall of the adjusting box 12 is provided with a travel groove 28 matched with the limiting block 27.

When the centrifugal wind wheel 5 is required to be overhauled in practical application, firstly, the fastening bolt 9 is loosened to open the access door 3, at the moment, the extrusion block 11 is separated from the pressure sensor 10, the numerical value of the pressure sensor 10 is changed, then, information is sent to the PLC controller 13 through a signal wire, the PLC controller 13 controls the positive and negative motor 26 to start, the positive and negative motor 26 drives the lead screw 16 to rotate, as the movable block 17 cannot rotate through the cooperation of the limiting block 27 and the travel groove 28, the movable block 17 is driven to move downwards when the lead screw 16 rotates, the movable block 17 drives the first contact plate 18 to move downwards through the first insulating frame 19, at the moment, the first contact plate 18 drives the first contact 20 to move downwards to be separated from the fourth contact plate 25, at the moment, the fan motor 4 is disconnected from an external power supply, the numerical value is changed through the addition of the pressure sensor 10, the PLC controller 13 and the power-off assembly, when the personnel open the access door 3, the pressure sensor 10 is in a numerical value change, the PLC controller 13 is controlled to enable the fan motor 4 to be disconnected from the external power supply, the fan motor 4 is prevented from driving the shaft to be mistakenly injured by the power-off assembly, the personnel when the personnel is prevented, the personnel is further improved, the safety is further, the first and the power-off assembly is driven by the fan motor 4 when the personnel is required to move, the lead screw, the first power, the contact plate 18 is further improved, the first and the contact plate 20 is driven, the contact plate and the first and the contact plate 20 is further stable, and the first and the second power and the power-down assembly is more stable.

In summary, by means of the technical scheme, when a person opens the access door, the pressure sensor, the PLC and the power-off assembly are added, the pressure sensor generates numerical value change to transmit signals to the PLC, the PLC controls the power-off assembly to disconnect the fan motor from an external power supply, the situation that the person is accidentally injured by the leakage of the fan motor shaft during the overhaul is prevented, the safety is further improved, the power-off assembly drives the moving block to move through the screw rod, the first switch-on plate and the second switch-on plate are separated to enable the first switch-on plate to be powered off, and the power-off assembly is enabled to be regulated more stably and rapidly.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. The utility model provides a centrifugal fan earth leakage protection device, includes base plate (1), its characterized in that, base plate (1) top is equipped with fan housing (2), fan housing (2) one side is equipped with access door (3), access door (3) with fan housing (2) are articulated, one side that access door (3) was kept away from to fan housing (2) is equipped with fan motor (4), fan motor (4) drive shaft extends to be connected with centrifugal wind wheel (5) in fan housing (2), fan housing (2) are located fixed slot (6) have been seted up to one side of access door (3), be equipped with connecting block (7) in fixed slot (6), threaded slot (8) have been seted up to connecting block (7) one side, access door (3) one side be equipped with run through access door (3) and with threaded slot (8) assorted fastening bolt (9), just be arranged in fixed slot (6) both ends are equipped with pressure sensor (10) that the symmetry set up, door (3) one side be equipped with pressure sensor (10) and be equipped with pressure sensor (12) in pressure sensor (12) one side of adjusting box (12), the top end of the adjusting box (12) is provided with an insulating sleeve (14) connected with the fan motor (4), and a power-off assembly matched with the fan motor (4) is arranged in the adjusting box (12).

2. The leakage protection device of a centrifugal fan according to claim 1, wherein a rubber pad is arranged on one side of the extrusion block (11).

3. The leakage protection device of a centrifugal fan according to claim 1, wherein the pressure sensor (10) is connected with the PLC controller (13) through a signal line.

4. The leakage protection device for a centrifugal fan according to claim 1, wherein the power-off assembly comprises symmetrically arranged fixed plates (15) arranged in the regulating box (12), a screw rod (16) is arranged between two groups of fixed plates (15), a moving block (17) is sleeved on the outer wall of the screw rod (16), a first contact plate (18) is arranged on one side of the moving block (17), the first contact plate (18) is connected with the moving block (17) through an insulating frame (19), a first contact point (20) is arranged at the top end of the first contact plate (18), a second contact point (21) is arranged at the bottom end of the first contact plate (18), a second contact plate (22) is arranged at the top end of the first contact plate, the second contact plate (22) is connected with the regulating box (12) through an insulating frame (23), a third contact point (24) is arranged at the top end of the second contact plate (22), a fourth contact point (25) is arranged at the bottom end of the second contact plate (21) and is connected with an external wire, the third contact point (24) is provided with a wire (14) penetrating through the insulating frame (23) and is connected with the first lead screw rod (16), the positive and negative motor (26) is connected with the PLC (13) through a control line.

5. The leakage protection device of a centrifugal fan according to claim 4, wherein the screw (16) is connected to the fixing plate (15) by means of bearings.

6. The leakage protection device of a centrifugal fan according to claim 4, wherein the moving block (17) is provided with a threaded hole matched with the screw rod (16), one side of the moving block (17) is provided with a limiting block (27), and the inner wall of the adjusting box (12) is provided with a travel groove (28) matched with the limiting block (27).