Cooling fan driven by alternating current

Abstract

The utility model discloses a cooling fan driven by alternating current, which belongs to the technical field of fan systems and comprises an isolating switch QS connected with a three-phase line, the isolating switch QS is connected with a first thermal relay FR1 and a second thermal relay FR2 which are connected in parallel through a fuse FU, one end of the first thermal relay FR1 is connected with a first contactor main contact KM1, and the other end of the first thermal relay FR2 is connected with a second contactor main contact KM2. The first contactor main contact KM1 is connected with a second resistor R2 in series through a motor, the second resistor R2 is connected with the first resistor R1, a second contactor main contact KM2 is connected between the second resistor R2 and the first resistor R1 in series, and a third contactor contact KM3 is connected between the motor and the second resistor R2 in series. The utility model can solve the technical problems that in the use process of the fan, the starting current is large, the energy consumption is large, more energy is consumed under long-time high-frequency trial, and the safety performance is poor.

Description

Technical Field

[0001] The utility model belongs to the technical field of fan systems, and particularly relates to a cooling fan driven by alternating current. Background Technique

[0002] A fan is a household appliance that uses an electric motor to drive the fan blades to rotate to accelerate the flow of air, mainly used for cooling and air circulation. It is widely used in places such as homes, classrooms, offices, stores, hospitals, and hotels.

[0003] During the power-on and use process of the fan, starting or speed regulation processing needs to be carried out frequently. However, during this process, the starting current is large, the energy consumption is high, and more energy will be consumed under long-term high-frequency use, which is not conducive to environmental protection. At the same time, the starting torque is small, which is not conducive to actual production requirements, so the applicability of the device is reduced. Content of the Utility Model

[0004] The purpose of the utility model is to provide a cooling fan driven by alternating current to solve the technical problems that during the use of the fan, the starting current is large, the energy consumption is high, and more energy will be consumed under long-term high-frequency use, which is not conducive to environmental protection.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A cooling fan driven by alternating current includes a disconnecting switch QS connected to a three-phase line. The disconnecting switch QS is connected to a first thermal relay FR1 and a second thermal relay FR2 in parallel through a fuse FU. One end of the first thermal relay FR1 is connected to a main contact KM1 of a first contactor. The main contact KM1 of the first contactor is connected in series with a second resistor R2 connected to a first resistor R1 through a motor. A main contact KM2 of a second contactor is connected in series between the second resistor R2 and the first resistor R1. A contact KM3 of a third contactor is connected in series between the motor and the second resistor R2;

[0007] Wherein, one end of the second thermal relay FR2 is connected to a first contactor auxiliary contact KM1 and a first time relay coil KT1 connected in parallel through a start switch SB1, a first time relay contact KT1 and a second contactor coil KM2 connected in series, a second contactor auxiliary contact KM2 and a second time relay coil KT2 connected in series, a second time relay contact KT2 and a third contactor coil KM3 connected in series, and a stop switch SB2 and a first contactor auxiliary contact KM1 connected in parallel and connected in series on the first contactor coil KM1.

[0008] Further, the main contacts KM1 of the first contactor and the main contacts KM2 of the second contactor are both normally open contacts.

[0009] Furthermore, the first contactor auxiliary contact KM1 and the second contactor auxiliary contact KM2 are both normally open contacts.

[0010] Furthermore, the first time relay coil KT1 and the second time relay contact KT2 are both normally open contacts with delayed closing and instantaneous opening.

[0011] Furthermore, the motor includes a stator winding core connected to the fixed seat. A stator wound with a coil is fixedly installed on the stator winding core. A rotor connected to the drive shaft is provided inside the stator. An electromagnetic field is formed between the coil and the rotor on the stator. One end of the drive shaft is fixedly installed on the fan blade.

[0012] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0013] (1) In this patent, when the circuit starts, all the starting resistors are connected. During the starting process, the starting resistors are short-circuited section by section. Through the control of the time relay, the resistors in the rotor circuit are cut off section by section to achieve the purpose of limiting the starting current.

[0014] (2) The motor in the fan adopts the three-phase AC wound rotor method, enabling the fan blade to rotate continuously and rapidly. It has a simple structure, convenient maintenance, excellent speed regulation and starting performance, and strong application performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is the circuit schematic diagram of the alternating current of the present utility model;

[0017] Figure 2 is the structural schematic diagram of the motor of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0019] Refer to the attached instruction manual Figure 1 - Figure 2 As shown, an alternating current-driven cooling fan includes a disconnect switch QS connected to three-phase lines. A fuse FU is connected to the disconnect switch QS, and a first thermal relay FR1 and a second thermal relay FR2 after being connected in parallel are connected to the fuse FU. One end of the first thermal relay FR1 is connected to a main contact KM1 of a first contactor. The main contact KM1 of the first contactor is connected in series with a motor and a second resistor R2 connected to a first resistor R1. A main contact KM2 of a second contactor is connected in series between the second resistor R2 and the first resistor R1. A contact KM3 of a third contactor is connected in series between the motor and the second resistor R2;

[0020] Among them, one end of the second thermal relay FR2 is connected to a first contactor auxiliary contact KM1 and a first time relay coil KT1 connected in parallel after being connected in series through a start switch SB1, a first time relay contact KT1 and a second contactor coil KM2 connected in series, a second contactor auxiliary contact KM2 and a second time relay coil KT2 connected in series, a second time relay contact KT2 and a third contactor coil KM3 connected in series, and a stop switch SB2 and a first contactor auxiliary contact KM1 connected in parallel and connected in series on the first contactor coil KM1.

[0021] Specifically, the main contact KM1 of the first contactor and the main contact KM2 of the second contactor are both normally open contacts. The auxiliary contact KM1 of the first contactor and the auxiliary contact KM2 of the second contactor are both normally open contacts. The first time relay coil KT1 and the second time relay contact KT2 are both normally open contacts with delayed closing and instantaneous opening. When the second time relay coil KT2 is energized, the contact KM3 of the third contactor is a normally open contact.

[0022] Specifically, when the stop switch SB2 is pressed, the first contactor coil KM1 is energized, the main contact KM1 of the first contactor closes and self-locks, and the auxiliary contact KM1 of the first contactor closes. At this time, the first time relay coil KT1 is energized, the first time relay contact KT1 closes with a delay, the second contactor coil KM2 is energized, the main contact KM2 of the second contactor closes, the circuit is short-circuited, the first resistor R1 is cut off, the auxiliary contact KM2 of the second contactor closes, the second time relay coil KT2 is energized, the second time relay contact KT2 closes with a delay, the third contactor coil KM3 is energized, and the contact KM3 of the third contactor closes, the circuit is short-circuited, and the second resistor R2 is cut off, thereby achieving the purpose of short-circuiting the entire circuit section by section, effectively limiting the starting current, and ensuring the safety and stability of the motor operation.

[0023] In this patent, the design method of using delay contacts is adopted. This design helps to avoid excessive current impact on the motor during startup, protects the motor from damage. At the same time, for some equipment that requires preheating or other preparation work, the delayed startup can also ensure that the equipment starts running in the best state.

[0024] The motor includes a stator winding core 2 connected to a fixed seat 1. A stator 4 wound with a coil 3 is fixedly installed on the stator winding core 2. A rotor 5 connected to a drive shaft is arranged inside the stator 4. An electromagnetic field is formed between the coil on the stator 4 and the rotor 5. One end of the drive shaft is fixedly installed on a fan blade.

[0025] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0026] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to only the specific embodiments. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A heat dissipation fan driven by an alternating current, characterized in that, It includes a disconnecting switch QS connected to the three-phase line. A fuse FU is connected to the disconnecting switch QS, and a first thermal relay FR1 and a second thermal relay FR2 after being connected in parallel are connected thereto. One end of the first thermal relay FR1 is connected to a main contact KM1 of a first contactor. The main contact KM1 of the first contactor is connected in series with a motor and a second resistor R2 connected to a first resistor R1. A main contact KM2 of a second contactor is connected in series between the second resistor R2 and the first resistor R1. A contact KM3 of a third contactor is connected in series between the motor and the second resistor R2; Among them, one end of the second thermal relay FR2 is connected to a first contactor auxiliary contact KM1, a first time relay coil KT1, a first time relay contact KT1 and a second contactor coil KM2, a second contactor auxiliary contact KM2 and a second time relay coil KT2, a second time relay contact KT2 and a third contactor coil KM3 which are connected in series after being connected in parallel through a start switch SB1, and a stop switch SB2 and a first contactor auxiliary contact KM1 which are connected in parallel and connected in series on the first contactor coil KM1.

2. The alternating current driven cooling fan according to claim 1, wherein The main contacts KM1 of the first contactor and the main contacts KM2 of the second contactor are both normally open contacts.

3. The alternating-current-driven cooling fan according to claim 1, wherein The auxiliary contacts KM1 of the first contactor and the auxiliary contacts KM2 of the second contactor are both normally open contacts.

4. The cooling fan driven by an alternating current according to claim 1, wherein The first time relay coil KT1 and the second time relay contact KT2 are both normally open contacts with delayed closing and instantaneous opening.

5. The cooling fan driven by an alternating current according to claim 1, wherein The motor includes a stator winding core (2) connected to a fixed seat (1). A stator (4) wound with a coil (3) is fixedly installed on the stator winding core (2). A rotor (5) connected to a drive shaft is arranged inside the stator (4). An electromagnetic field is formed between the coil on the stator (4) and the rotor (5). One end of the drive shaft is fixedly installed on a fan blade.

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