A multi-speed fan speed control device

Abstract

The present invention discloses a multi-speed fan speed regulation device, which includes a frequency converter, a general electric control board of an air conditioner, a high-speed output relay of the fan, a medium-speed output relay of the fan, and a low-speed output relay of the fan. The power input terminal of the frequency converter is connected to the live wire, the power output terminal of the frequency converter is connected to the three-phase power terminals of the fan motor, the power input terminal of the general electric control board is connected to the neutral wire and the live wire, the high-speed output terminal of the general electric control board is connected to the neutral wire through the coils of the three relays, each of the three relays takes a normally open contact to form a parallel branch, one end of the parallel branch is connected to the start / stop signal terminal of the frequency converter, each of the three relays takes a second normally open contact, one end of the second normally open contact is respectively connected to different multifunctional terminals of the frequency converter, and the other ends of the second normally open contacts are commonly connected and then connected to the other end of the parallel branch. The present invention has the characteristics of wide adaptability and simple circuit construction, etc.

Description

Technical Field

[0001] The invention relates to the field of air conditioner fan speed regulating devices, in particular to a multi-speed fan speed regulating device. Background Art

[0002] Nowadays, the speed control of industrial, marine and military air-conditioning fans mainly adopts the motor winding tap speed control method. This method has the characteristics of simplicity and low cost, but it often cannot meet the actual needs on site during actual use. If other speed control devices are added, high requirements are placed on the motor, which cannot be applied to motors with different performances, and additional components are required. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-speed fan speed regulating device to solve the problem that the prior art air conditioner fan speed regulating device has high requirements on the motor and needs additional components.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A multi-speed fan speed regulating device, characterized in that it includes a frequency converter, a universal electric control board of an air conditioner, a high-end output relay of the fan, a mid-range output relay of the fan, and a low-end output relay of the fan. The power input terminal of the frequency converter is connected to three live wires in a three-phase four-wire power line, the power output terminal of the frequency converter is connected to a three-phase power terminal of a fan motor, the power input terminal of the universal electric control board is respectively connected to a neutral wire and one of the live wires in the three-phase four-wire power line, the high-end output terminal of the universal electric control board is connected to the neutral wire in the three-phase four-wire power line through the coil of the high-end output relay of the fan, the mid-range output terminal of the universal electric control board is connected to the neutral wire in the three-phase four-wire power line through the coil of the mid-range output relay of the fan, the low-end output terminal of the universal electric control board is connected to the neutral wire in the three-phase four-wire power line through the coil of the low-range output relay of the fan, and the high-end output relay of the fan, the mid-range output relay of the fan, and the low-range output relay of the fan each take a normally open contact phase The parallel connection forms a parallel branch, one end of the parallel branch is connected to the start / stop signal end of the frequency converter, the fan high-end output relay, the fan mid-range output relay, and the fan low-range output relay each take a second normally open contact, one end of the second normally open contact is respectively connected to different multi-function terminals of the frequency converter, and the other end of the second normally open contact is connected to the other end of the parallel branch after being connected together; the universal electric control board outputs or does not output voltage to the coils of the fan high-end output relay, the fan mid-range output relay, and the fan low-range output relay through the high, medium, and low-range output ends, and the corresponding normally open contacts are closed or opened based on whether the coils of the fan high-end output relay, the fan mid-range output relay, and the fan low-range output relay are energized or not energized, and different start signals of the frequency converter are formed by the combination of the normally open contact states. When the frequency converter receives different start signals, it outputs different frequency modulation voltages to the fan motor to control the operation of the fan motor.

[0006] The multi-speed fan speed regulating device is characterized in that the common terminal COM of the frequency converter is connected to the other end of the parallel branch.

[0007] The multi-speed fan speed regulating device is characterized in that it also includes a fan overload protection relay, and the fan overload protection relay is electrically connected between the power output terminal of the inverter and the three-phase power supply terminal of the fan motor.

[0008] The present invention utilizes the high, medium and low speed outputs of the universal electric control board of the air conditioner core control and combines the use characteristics of the frequency converter to arbitrarily set the corresponding speed of the fan under different states. It has wide adaptability and simple circuit construction, and is particularly suitable for oxygen cabin air conditioner heavy torque fans. The present invention is equipped with a frequency converter, a universal electric control board, a three-speed output relay, and a fan overload protector. Different combinations of the output of the universal electric control board are used as input conditions for multi-stage frequency conversion to adjust the fan speed on demand.

[0009] The beneficial effects of the present invention are embodied in:

[0010] 1) The frequency converter can select multiple frequency ranges for speed regulation output by combining its multi-function terminals. It has low requirements on motor characteristics and strong adaptability.

[0011] 2) Use the universal electric control board of the air conditioner. While meeting the overall control of the air conditioner, use the three-speed speed control output of the fan of the universal electric control board as the speed control input condition, without adding other signal output devices.

[0012] 3) The three-speed speed regulation output can be used as the inverter starting condition, which is integrated with the air conditioning master control, without redundant operation, simple and convenient.

[0013] 4) A fan thermal overload protector is installed to effectively monitor fan failures and ensure safe operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural principle diagram of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] like Figure 1As shown, a multi-speed fan speed regulating device includes a frequency converter 2, a universal electric control board 3 of an air conditioner, a fan high-speed output relay, a fan mid-speed output relay, and a fan low-speed output relay. The power input terminal of the frequency converter 2 is connected to three live wires L1, L2, and L3 in a three-phase four-wire power line 1. The power output terminal of the frequency converter 2 is connected to the three-phase power terminal of the fan motor through a fan overload protection relay 7. The power input terminal of the universal electric control board 3 is respectively connected to the neutral wire N and one of the live wires L3 in the three-phase four-wire power line 1. The high-speed output terminal of the universal electric control board 3 is connected to the neutral wire N and one of the live wires L3 in the three-phase four-wire power line 1. The end is connected to the neutral line N in the three-phase four-wire power line 1 through the coil 4 of the fan high-range output relay, the mid-range output end of the universal electric control board 3 is connected to the neutral line N in the three-phase four-wire power line 1 through the coil 5 of the fan mid-range output relay, and the low-range output end of the universal electric control board 3 is connected to the neutral line N in the three-phase four-wire power line 1 through the coil 6 of the fan low-range output relay. The fan high-range output relay, the fan mid-range output relay, and the fan low-range output relay each take a normally open contact 4.1, 5.1, 6.1 and are connected in parallel to form a parallel branch. The parallel branch one The end is connected to the start / stop signal end ON / OFF of the inverter 2. The fan high-end output relay, fan mid-end output relay, and fan low-end output relay respectively take the second normally open contact 4.2, 5.2, and 6.2. One end of the second normally open contact 4.2, 5.2, and 6.2 is respectively connected to the multi-function terminal X1, X2, and X3 of the inverter. The other end of the second normally open contact 4.2, 5.2, and 6.2 is connected in parallel to the other end of the parallel branch. The universal electric control board 3 outputs to the fan high-end through the high, medium, and low output ends. The coils of the relay, the fan mid-range output relay, and the fan low-range output relay output or do not output voltage. Based on whether the coils 4, 5, and 6 of the fan high-range output relay, the fan mid-range output relay, and the fan low-range output relay are energized or not, the corresponding normally open contacts 4.1, 5.1, 6.1 and 4.2, 5.2, 6.2 are closed or opened accordingly. Different starting signals of the inverter 2 are formed through the combination of the normally open contact states. When the inverter 2 receives different starting signals, it outputs different frequency modulation voltages to the fan motor 8 to control the operation of the fan motor 8.

[0017] In the present invention, the common terminal COM of the frequency converter is connected to the other end of the parallel branch.

[0018] The inverter of the present invention outputs different frequency modulation voltages to realize multi-speed operation combination relationship as shown in Table 1:

[0019] Table 1 Multi-speed operation selection table

[0020]

[0021] When the unit is shut down and the universal electric control board has no output, the ON / OFF input of the start / stop signal terminal of inverter 2 is OFF, and inverter 2 does not start.

[0022] When the unit is operating normally, only one output of the universal electric control board 3 is ON at any time, so the multi-stage operating frequency of a total of 7 stages is actually only applied to the three stages of multi-stage frequency 1, multi-stage frequency 2, and multi-stage frequency 4, and multi-stage frequencies 1 to 7 are adjustable in the relevant settings of the inverter, so they can be adjusted at any time according to different on-site conditions. According to the output of the universal electric control board 3 and the setting of the multi-stage frequency, the fan motor 8 can be effectively operated according to actual needs.

[0023] The embodiments described in the present invention are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made to the technical solutions of the present invention by engineers and technicians in this field should fall within the protection scope of the present invention. The technical contents for which protection is sought in the present invention have all been recorded in the claims.

Claims

1. A multi-speed fan speed regulation device, characterized in that: It includes an inverter, a general-purpose electronic control board of an air conditioner, a high-speed output relay of the fan, a medium-speed output relay of the fan, and a low-speed output relay of the fan. The power input terminal of the inverter is connected to three live wires in a three-phase four-wire power supply line. The power output terminal of the inverter is connected to the three-phase power supply terminal of the fan motor. The power input terminal of the general-purpose electronic control board is respectively connected to the neutral wire and one of the live wires in the three-phase four-wire power supply line. The high-speed output terminal of the general-purpose electronic control board is connected to the neutral wire in the three-phase four-wire power supply line through the coil of the high-speed output relay of the fan. The medium-speed output terminal of the general-purpose electronic control board is connected to the neutral wire in the three-phase four-wire power supply line through the coil of the medium-speed output relay of the fan. The low-speed output terminal of the general-purpose electronic control board is connected to the neutral wire in the three-phase four-wire power supply line through the coil of the low-speed output relay of the fan. The high-speed output relay of the fan, the medium-speed output relay of the fan, and the low-speed output relay of the fan respectively take a normally open contact and are connected in parallel to form a parallel branch. One end of the parallel branch is connected to the start / stop signal terminal of the inverter. The high-speed output relay of the fan, the medium-speed output relay of the fan, and the low-speed output relay of the fan respectively take a second normally open contact. One end of the second normally open contact is respectively connected to different multi-functional terminals of the inverter. The other ends of the second normally open contacts are connected together and then connected to the other end of the parallel branch; the general-purpose electronic control board outputs or does not output voltage to the coils of the high-speed output relay of the fan, the medium-speed output relay of the fan, and the low-speed output relay of the fan through the high, medium, and low-speed output terminals. Based on whether the coils of the high-speed output relay of the fan, the medium-speed output relay of the fan, and the low-speed output relay of the fan are energized or not, the corresponding normally open contacts are closed or opened correspondingly. Different start signals of the inverter are formed through the combination of the states of the normally open contacts. When the inverter receives different start signals, it outputs different frequency-modulated voltages to the fan motor to control the operation of the fan motor; The common terminal COM of the inverter is connected to the other end of the parallel branch; The multi-speed fan speed regulation device further includes a fan overload protection relay, and the fan overload protection relay is electrically connected between the power output terminal of the inverter and the three-phase power supply terminal of the fan motor.

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