Fan protection device

Abstract

The utility model relates to a fan protection device, which comprises a bottom plate, a shell, an overcurrent protector, an alternating current contactor and a button, the alternating current contactor comprises an electromagnetic driving mechanism and a contact system, the electromagnetic driving mechanism comprises a coil framework, a magnet yoke, a coil, a static iron core and a movable iron core, and the contact system comprises a shell, a movable contact frame, a movable contact and two static contacts. An arc extinguish chamber is arranged at the position, corresponding to the position between the moving contact and the static contact, in the shell, two microswitches are arranged on the two sides of the shell, a shifting rod matched with the two microswitches is arranged on the moving contact frame, the shifting rod acts along with the moving contact frame and triggers the two microswitches, and connection or disconnection of the two microswitches is achieved. The arc extinguishing device has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect and convenience in operation.

Description

Technical Field

[0001] The utility model specifically relates to a fan protection device. Background Art

[0002] At present, the body ventilator on the diesel locomotive is connected through a trip switch with a rated current of 20A. During use, its closing or opening requires manual operation. When operating according to the normal process, there will be no problems. However, when the locomotive returns to the depot, after the crew completes the shutdown operation of the diesel engine, they often forget to operate and disconnect the trip switch. If the crew gets on the locomotive next time and does not check the position of the trip switch and directly starts the startup operation of the diesel engine, after the crew presses the diesel engine start button, the AC contactor will be attracted, and the main contacts of the AC contactor will close. At this time, the power supply of the locomotive battery is controlled through the main contacts of the AC contactor. This power supply drives the body ventilator to work through the trip switch in the closed state. Due to the voltage division of the body ventilator, it is extremely easy to occur that the diesel engine startup is unsuccessful due to low battery voltage and at the same time the battery is discharged, which affects the normal dispatching and operation of the locomotive. Therefore, in order to effectively avoid the situation of battery discharge of the locomotive or the inability to start the diesel engine caused by the crew's failure to operate according to regulations, it is very necessary to design a fan protection device. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a fan protection device with simple structure, stable and reliable performance, good arc extinguishing effect and convenient operation.

[0004] To achieve the above purpose, the utility model adopts a fan protection device, which includes a bottom plate, a housing arranged on the bottom plate, an overcurrent protector arranged on the housing, an AC contactor arranged in the housing and electrically connected to the overcurrent protector, and a button arranged on the housing for starting the AC contactor. The AC contactor includes an electromagnetic driving mechanism and a contact system. The electromagnetic driving mechanism includes a coil bobbin arranged on the bottom plate, a yoke arranged on the coil bobbin, a coil arranged on the coil bobbin, a static iron core arranged inside the coil bobbin, and a moving iron core arranged on the coil bobbin and cooperating with the static iron core. The contact system includes a housing arranged on the yoke, a moving contact holder arranged inside the housing and linked with the moving iron core, a moving contact arranged on the moving contact holder, and two static contacts arranged inside the housing and cooperating with the moving contact. An arc extinguishing chamber is arranged inside the housing corresponding to the position between the moving contact and the static contacts. Two micro switches are arranged on both sides of the housing. A lever cooperating with the two micro switches is arranged on the moving contact holder. The lever moves with the moving contact holder and triggers the two micro switches, and constitutes the on or off of the two micro switches.

[0005] The beneficial effects of the above structure are: the overcurrent protector of the fan protection device can play an overcurrent protection role. When the load fan fails and causes its working current to exceed the limit (20A), the overcurrent protector can cut off the working power of the fan within a limited time to avoid serious consequences; after the diesel engine stops, the moving contact of the AC contactor is disconnected from the static contact, the moving contact frame drives the toggle action, and the two micro switches cut off the control circuit of the locomotive body fan. Before starting the diesel engine next time, the two micro switches are always in a disconnected state. Only after the diesel engine is started and the auxiliary power generation starts to work, the button on the fan protection device is manually operated to reconnect the control circuit of the locomotive body fan, which can effectively avoid the situation that the locomotive battery is depleted or the diesel engine cannot be started due to the driver and crew not operating according to the regulations. And the arc extinguishing chamber can enhance the arc extinguishing effect of the AC contactor, which is conducive to improving the breaking capacity of the AC contactor. Therefore, the fan protection device has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect, and convenient operation.

[0006] In particular, magnetizing sheets are provided on the outer wall of the housing at both sides corresponding to the arc extinguishing chamber. The magnetizing sheets can quickly introduce the arc into the arc extinguishing chamber, thereby quickly extinguishing the arc, which is beneficial to improving the arc extinguishing effect of the fan protection device.

[0007] In particular, the micro switch is symmetrically provided with two fixing plates, the two fixing plates are respectively provided with bolts, and the bolts are connected to the nuts of the housing. The micro switch is fixed to the housing through the two fixing plates, so that the assembly of the micro switch and the housing is convenient and the assembly efficiency is higher.

[0008] In particular, a support block is provided on the shell at a position corresponding to the nut, and a clamping groove matching the nut is provided on the support block, and the nut is clamped in the clamping groove, and a clamping fit between the nut and the support block is formed. The nut is clamped in the clamping groove of the shell, thereby facilitating the assembly of the nut and the shell, and the assembly is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a stereogram of an embodiment of the utility model.

[0010] Figure 2 It is a cross-sectional view of an embodiment of the utility model.

[0011] Figure 3 This is an exploded view of an embodiment of the utility model.

[0012] Figure 4 This is an internal structure diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0013] like Figures 1 to 4As shown, the embodiment of the utility model is a wind turbine protection device, including a base plate 10, a shell 11 arranged on the base plate 10, an overcurrent protector 12 arranged on the shell 11, an AC contactor 20 arranged in the shell 11 and electrically connected to the overcurrent protector 12, and a button 13 arranged on the shell 11 and used to start the AC contactor 20. The AC contactor 20 includes an electromagnetic drive mechanism 30 and a contact system 40. The electromagnetic drive mechanism 30 is arranged on a coil skeleton 31 on the base plate 10, a yoke 32 arranged on the coil skeleton 31, a coil 33 arranged on the coil skeleton 31, a static iron core 34 arranged in the coil skeleton 31, and a button 13 arranged on the coil skeleton 31 and electrically connected to the static iron core 34. 4, the contact system 40 comprises a housing 41 arranged on the yoke 32, a movable contact frame 42 arranged in the housing 41 and coordinated with the movable iron core 35, a movable contact 43 arranged on the movable contact frame 42, and two stationary contacts 44 arranged in the housing 41 and coordinated with the movable contact 43. An arc extinguishing chamber 45 is arranged in the housing 41 between the movable contact 43 and the stationary contact 44. Two micro switches 46 are arranged on both sides of the housing 41. A lever 421 coordinated with the two micro switches 46 is arranged on the movable contact frame 42. The lever 421 moves with the movable contact frame 42 and triggers the two micro switches 46, and constitutes the connection or disconnection of the two micro switches 46. Magnetizing sheets 47 are respectively arranged on the outer wall of the housing 41 at both sides of the arc extinguishing chamber 45. The magnetizing sheets can quickly introduce the arc into the arc extinguishing chamber, so that the arc can be quickly extinguished, which is beneficial to improving the arc extinguishing effect of the fan protection device.

[0014] like Figure 3 As shown, two fixing plates 48 are symmetrically arranged on the micro switch 46, and bolts 49 are respectively arranged on the two fixing plates 48, and the bolts 49 are connected to the nuts 50 of the housing 41. The micro switch is fixed to the housing through two fixing plates, so that the assembly of the micro switch and the housing is convenient, and the assembly efficiency is higher. A support block 411 is arranged on the housing 41 corresponding to the nut 50, and a snap-in groove 412 matching the nut 50 is arranged on the support block 411. The nut 50 is snap-fitted in the snap-in groove 412, and the snap-fitting of the nut 50 and the support block 411 is formed. The nut is snap-fitted in the snap-in groove of the housing, so that the assembly of the nut and the housing is convenient, and the assembly is more convenient.

[0015] The overcurrent protector of the fan protection device can play an overcurrent protection role. When the load fan fails and causes its working current to exceed the limit (20A), the overcurrent protector can cut off the working power of the fan within a limited time to avoid serious consequences. After the diesel engine stops, the moving contact of the AC contactor is disconnected from the static contact, and the moving contact frame drives the toggle action. The two micro switches cut off the control circuit of the locomotive body fan. Before the next start of the diesel engine, the two micro switches are always in the disconnected state. Only after the diesel engine is started and the auxiliary power generation starts to work, the button on the fan protection device is manually operated to reconnect the control circuit of the locomotive body fan, which can effectively avoid the situation that the locomotive battery is depleted or the diesel engine cannot be started due to the driver and crew not operating according to the regulations. And the arc extinguishing chamber can enhance the arc extinguishing effect of the AC contactor, which is conducive to improving the breaking capacity of the AC contactor. Therefore, the fan protection device has the advantages of simple structure, stable and reliable performance, good arc extinguishing effect, and convenient operation.

Claims

1. A fan protection device, characterized in that: It includes a base plate, a shell arranged on the base plate, an overcurrent protector arranged on the shell, an AC contactor arranged in the shell and electrically connected to the overcurrent protector, and a button arranged on the shell and used to start the AC contactor. The AC contactor includes an electromagnetic drive mechanism and a contact system. The electromagnetic drive mechanism includes a coil frame arranged on the base plate, a yoke arranged on the coil frame, a coil arranged on the coil frame, a static iron core arranged in the coil frame, and a moving iron core arranged on the coil frame and matched with the static iron core. The contact system includes a shell arranged on the yoke, a moving contact frame arranged in the shell and linked with the moving iron core, a moving contact arranged on the moving contact frame, and two static contacts arranged in the shell and matched with the moving contact. An arc extinguishing chamber is arranged between the corresponding moving contact and the static contact in the shell. Two micro switches are arranged on both sides of the shell. A lever matched with the two micro switches is arranged on the moving contact frame. The lever moves with the moving contact frame and triggers the two micro switches, and constitutes the connection or disconnection of the two micro switches.

2. The fan protection device according to claim 1, wherein: The outer wall of the shell is provided with magnetizing sheets at two sides corresponding to the arc extinguishing chamber.

3. The fan protection device according to claim 1 or 2, characterized in that: Two fixing plates are symmetrically arranged on the micro switch, and bolts are respectively arranged on the two fixing plates, and the bolts are connected to nuts of the housing.

4. The fan protection device according to claim 3, characterized in that: A support block is arranged on the shell at a position corresponding to the nut, and a clamping groove matching the nut is arranged on the support block. The nut is clamped in the clamping groove, and a clamping fit between the nut and the support block is formed.

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