Fan coil control system

Abstract

The utility model provides a fan coil control system which comprises a temperature controller used for outputting a combined gear signal and an alternating current power supply; the motor controller is used for receiving a combined gear signal and an alternating current power supply through a plurality of control lines; the motor controller comprises a rectification unit, a rotating speed identification unit and an electronic steering driving unit; the rectifying unit is used for rectifying and filtering the alternating current power supply to obtain a direct current power supply; the rotating speed identification unit is used for matching different rotating speed instructions for different combined gear signals; and the electronic steering driving unit is used for taking the direct-current power supply as a power supply and inversely driving the motor to operate at different rotating speeds according to different rotating speed instructions. According to the utility model, the control gears of the motor are increased, the fine degree of fan adjustment is improved, the requirements of users are met, meanwhile, the wall-buried cables are fully utilized, the cables are not increased, and the improvement cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of HVAC control, in particular to a fan coil control system. Background Art

[0002] Fan coil units, also known as fan discs, are a type of air handling device consisting of a fan and an air heat exchanger. They are often used in HVAC systems to cool (heat) small areas. When chilled water, hot water or Freon flows through the heat exchanger, it exchanges heat with the air, lowering (or raising) the air temperature to improve the temperature and humidity of the cooling (heating) area.

[0003] In the prior art, three-speed control and analog control are commonly used to control the fan speed. The three-speed control is to connect the high, medium and low speed gear lines with the thermostat, and directly drive the corresponding gear winding of the AC asynchronous motor to run the selected speed, such as Figure 1 The analog control common temperature controller generates a 0 to 10V voltage signal, which drives the controller to drive the motor to run and achieve stepless speed regulation.

[0004] When upgrading the HVAC equipment of existing buildings, users generally want to obtain more precise wind speed control requirements to make the indoor air environment more comfortable. However, the original fan motor generally adopts a three-speed control form, and the three-speed control line has been pre-buried in the wall, which is inconvenient or impossible to replace. If the original cable is upgraded to a 0-10V stepless speed regulator, it is bound to produce a situation where strong and weak electricity are in the same pipe, which does not meet the specifications. In the current technology, no matter what method is used, it is impossible to balance the difficulty of implementation, project cost and equipment performance. Summary of the invention

[0005] In order to solve the above defects existing in the prior art, the utility model provides a fan coil control system.

[0006] The utility model provides a fan coil control system, comprising:

[0007] Thermostat, used to output combined gear position signal and AC power;

[0008] A motor controller, wherein the input end of the motor controller is connected to the output end of the thermostat through a plurality of control lines, the output end of the motor controller is connected to the motor of the fan coil unit, the control lines are connected one by one to each gear signal in the combined gear signal, and the motor controller is used to receive the combined gear signal and the AC power supply through the plurality of control lines;

[0009] The motor controller comprises a rectifier unit, a rotation speed identification unit and an electronic steering drive unit, wherein the output end of the rectifier unit and the output end of the rotation speed identification unit are connected to the input end of the electronic steering drive unit, and the output end of the electronic steering drive unit is connected to the motor;

[0010] The rectifying unit is used to rectify and filter the AC power supply to obtain a DC power supply;

[0011] The speed identification unit is used to match different speed instructions for different combination gear signals;

[0012] The electronic steering drive unit is used to use the DC power supply as a power source and invert and drive the motor to operate at different speeds according to different speed instructions.

[0013] According to a fan coil control system provided by the utility model, the speed identification unit includes a plurality of switches and a plurality of speed command transmitters, the output ends of the plurality of switches are connected to the input ends of the plurality of speed command transmitters in a one-to-one correspondence, and the output ends of the plurality of speed command transmitters are connected to the input end of the electronic steering drive unit;

[0014] The number of the switches is the same as the number of types of the combined gear position signals, the switches correspond to various combined gear position signals one by one, and the switches are closed when triggered by the combined gear position signals corresponding to the switches;

[0015] The speed instructions sent by different speed instruction transmitters carry different speeds.

[0016] According to a fan coil control system provided by the utility model, the combined gear signal includes a first gear signal, a second gear signal and a third gear signal.

[0017] According to a fan coil control system provided by the utility model, the combined gear position signals include 000, 001, 010, 011, 100, 101, 110 and 111.

[0018] According to a fan coil control system provided by the utility model, the speed corresponding to 000 is 0;

[0019] The speed corresponding to 001 is the speed corresponding to the original first gear, 010 is the speed corresponding to the original second gear, and 100 is the speed corresponding to the original third gear. The speed corresponding to the original first gear is less than the speed corresponding to the original second gear, and the speed corresponding to the original second gear is less than the speed corresponding to the original third gear;

[0020] The speeds corresponding to 011, 101, 110 and 111 are the speeds corresponding to the newly added gears.

[0021] According to a fan coil control system provided by the utility model, the motor is a permanent magnet synchronous motor.

[0022] According to a fan coil control system provided by the utility model, there are three control lines, which are respectively used to transmit the first gear position signal, the second gear position signal and the third gear position signal.

[0023] According to a fan coil control system provided by the utility model, it also includes an optocoupler isolator, the input end of the optocoupler isolator is connected to the output end of the temperature controller, and the output end of the optocoupler isolator is connected to the input end of the speed identification unit.

[0024] According to a fan coil control system provided by the utility model, the number of the optical coupler isolators is 3, and the optical coupler isolators correspond one-to-one to the first gear signal, the second gear signal, and the third gear signal.

[0025] According to a fan coil control system provided by the utility model, the temperature controller includes a power supply, a single-chip microcomputer controller and a relay driver, the power supply is connected to the single-chip microcomputer controller, and the single-chip microcomputer controller is connected to the relay driver.

[0026] The fan coil control system provided by the utility model generates a combined gear signal in a combined form through a temperature controller, and outputs the AC power required by the motor at the same time. The rectifier unit rectifies and filters the AC power to obtain a DC power supply. The speed identification unit matches different speed instructions for different combined gear signals. The electronic steering drive unit uses the DC power supply as a power supply and drives the motor to operate at different speeds according to different speed instructions, thereby increasing the control gears of the motor and improving the precision of the fan adjustment to meet user needs. At the same time, it makes full use of the buried wall cables, does not increase the cables, and has a low transformation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the fan coil control system structure provided by the prior art;

[0029] Figure 2 This is one of the structural schematic diagrams of the fan coil control system provided by the utility model;

[0030] Figure 3 It is a structural schematic diagram of a motor controller in a fan coil control system provided by the utility model;

[0031] Figure 4This is a control flow diagram of the fan coil control system provided by the utility model;

[0032] Figure 5 This is the second structural schematic diagram of the fan coil control system provided by the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Combine the following Figure 2 and Figure 3 The utility model is described as a fan coil control system, comprising:

[0035] Thermostat, used to output combined gear position signal and AC power;

[0036] A motor controller, wherein the input end of the motor controller is connected to the output end of the thermostat through a plurality of control lines, the output end of the motor controller is connected to the motor of the fan coil unit, the control lines are connected one by one to each gear signal in the combined gear signal, and the motor controller is used to receive the combined gear signal and the AC power supply through the plurality of control lines;

[0037] The motor controller comprises a rectifier unit, a rotation speed identification unit and an electronic steering drive unit, wherein the output end of the rectifier unit and the output end of the rotation speed identification unit are connected to the input end of the electronic steering drive unit, and the output end of the electronic steering drive unit is connected to the motor;

[0038] The rectifying unit is used to rectify and filter the AC power supply to obtain a DC power supply;

[0039] The speed identification unit is used to match different speed instructions for different combination gear signals;

[0040] The electronic steering drive unit is used to use the DC power supply as a power source and invert and drive the motor to operate at different speeds according to different speed instructions.

[0041] The combined gear signal is a combination of signals of multiple gears. When there is output on the gear, the corresponding gear signal is 1; when there is no output on the gear, the corresponding gear signal is 0.

[0042] Existing thermostats usually have three gears, namely low speed, medium speed and high speed. The gear signals corresponding to each gear are directly transmitted to the motor through independent control lines to control the motor to run at low speed, medium speed or high speed.

[0043] If the thermostat has three gears, the thermostat outputs eight types of combined gear signals. The thermostat outputs each gear signal in the combined gear signal through three control lines, and outputs the AC power through three control lines.

[0044] The motor controller issues different speed commands according to different combination gear signals to control the motor to run at different speeds. The specific control process of the motor controller is as follows: Figure 4 shown.

[0045] After acquiring the combined gear position signal and the AC power supply, the motor controller sends the combined gear position signal to the speed identification unit for speed identification, and sends the AC power supply to the rectification unit for rectification and filtering.

[0046] The speed identification unit can match different speed instructions according to the combined gear signal. Different speed instructions carry different speeds. The combined gear signal and the speed instruction can be pre-associated. When the temperature controller outputs 8 types of combined gear signals, the motor can be controlled to run at 8 speeds.

[0047] In this embodiment, a temperature controller is used to generate a combined gear signal in a combined form, and the AC power required by the motor is outputted at the same time. The rectifier unit rectifies and filters the AC power to obtain a DC power. The speed identification unit matches different speed instructions for different combined gear signals. The electronic steering drive unit uses the DC power as a power source and drives the motor to operate at different speeds according to different speed instructions, thereby increasing the control gears of the motor and improving the precision of the fan adjustment to meet user needs. At the same time, the buried wall cables are fully utilized without adding cables, and the transformation cost is low.

[0048] On the basis of the above embodiment, the speed identification unit in this embodiment includes a plurality of switches and a plurality of speed command transmitters, the output ends of the plurality of switches are connected to the input ends of the plurality of speed command transmitters in a one-to-one correspondence, and the output ends of the plurality of speed command transmitters are connected to the input end of the electronic steering drive unit;

[0049] The number of the switches is the same as the number of types of the combined gear position signals, the switches correspond to various combined gear position signals one by one, and the switches are closed when triggered by the combined gear position signals corresponding to the switches;

[0050] The speed instructions sent by different speed instruction transmitters carry different speeds.

[0051] For example, when there are 8 kinds of combination gear signals output by the temperature controller, there are 8 switches and 8 speed command transmitters. The switches correspond to various combination gear signals one by one and are connected to the speed command transmitters one by one. All switches are initially in an open state and are closed when triggered by the combination gear signal corresponding to the switch. The combination gear signal corresponding to a switch is 010. The switch is triggered to close only when the combination gear signal is 010, otherwise it is in an open state. When the switch is closed, the speed command transmitter is turned on and sends a speed command of the corresponding speed.

[0052] On the basis of the above embodiment, the combined gear position signal in this embodiment includes a first gear position signal, a second gear position signal and a third gear position signal.

[0053] For example, the first gear position signal is a low-speed gear position signal, the second gear position signal is a medium-speed gear position signal, and the third gear position signal is a high-speed gear position signal.

[0054] On the basis of the above embodiments, the combined gear position signals in this embodiment include 000, 001, 010, 011, 100, 101, 110 and 111.

[0055] Based on the above embodiment, the speed corresponding to 000 in this embodiment is 0;

[0056] The speed corresponding to 001 is the speed corresponding to the original first gear, 010 is the speed corresponding to the original second gear, and 100 is the speed corresponding to the original third gear. The speed corresponding to the original first gear is less than the speed corresponding to the original second gear, and the speed corresponding to the original second gear is less than the speed corresponding to the original third gear;

[0057] The speeds corresponding to 011, 101, 110 and 111 are the speeds corresponding to the newly added gears.

[0058] The combined gear position signals output by the temperature controller and their meanings can be found in Table 1.

[0059] Table 1

[0060]

[0061] On the basis of the above embodiments, the motor described in this embodiment is a permanent magnet synchronous motor.

[0062] On the basis of the above embodiment, in this embodiment, there are three control lines, which are respectively used to transmit the first gear position signal, the second gear position signal and the third gear position signal.

[0063] Based on the above embodiments, Figure 5As shown, this embodiment also includes an optocoupler isolator, the input end of the optocoupler isolator is connected to the output end of the temperature controller, and the output end of the optocoupler isolator is connected to the input end of the speed identification unit.

[0064] Optocoupler isolators eliminate direct electrical connection between the two isolated circuits, mainly to prevent interference caused by electrical connection, especially between low-voltage control circuits and external high-voltage circuits.

[0065] Based on the above embodiments, Figure 5 As shown, in this embodiment, the number of the optical couplers isolators is 3, and the optical couplers are in one-to-one correspondence with the first gear signal, the second gear signal, and the third gear signal.

[0066] The three optocouplers are respectively connected to one gear signal to perform optocoupler isolation between the gear signals and reduce interference between the gear signals.

[0067] Based on the above embodiments, Figure 5 As shown, the temperature controller in this embodiment includes a power supply, a single-chip microcomputer controller and a relay driver, the power supply is connected to the single-chip microcomputer controller, and the single-chip microcomputer controller is connected to the relay driver.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A fan coil control system, characterized in that: include: Thermostat, used to output combined gear position signal and AC power; A motor controller, wherein the input end of the motor controller is connected to the output end of the thermostat through a plurality of control lines, the output end of the motor controller is connected to the motor of the fan coil unit, the control lines are connected one by one to each gear signal in the combined gear signal, and the motor controller is used to receive the combined gear signal and the AC power supply through the plurality of control lines; The motor controller comprises a rectifier unit, a rotation speed identification unit and an electronic steering drive unit, wherein the output end of the rectifier unit and the output end of the rotation speed identification unit are connected to the input end of the electronic steering drive unit, and the output end of the electronic steering drive unit is connected to the motor; The rectifying unit is used to rectify and filter the AC power supply to obtain a DC power supply; The speed identification unit is used to match different speed instructions for different combination gear signals; The electronic steering drive unit is used to use the DC power supply as a power source and invert and drive the motor to operate at different speeds according to different speed instructions.

2. The fan coil control system according to claim 1, characterized in that: The speed identification unit includes a plurality of switches and a plurality of speed command transmitters, the output ends of the plurality of switches are connected to the input ends of the plurality of speed command transmitters in a one-to-one correspondence, and the output ends of the plurality of speed command transmitters are connected to the input end of the electronic steering drive unit; The number of the switches is the same as the number of types of the combined gear position signals, the switches correspond to various combined gear position signals one by one, and the switches are closed when triggered by the combined gear position signals corresponding to the switches; The speed instructions sent by different speed instruction transmitters carry different speeds.

3. The fan coil control system according to claim 1, characterized in that: The combined gear position signal includes a first gear position signal, a second gear position signal and a third gear position signal.

4. The fan coil control system according to claim 3, characterized in that: The combined gear position signals include 000, 001, 010, 011, 100, 101, 110 and 111.

5. The fan coil control system according to claim 4, characterized in that: 000 corresponds to the rotation speed of 0; The speed corresponding to 001 is the speed corresponding to the original first gear, 010 is the speed corresponding to the original second gear, and 100 is the speed corresponding to the original third gear. The speed corresponding to the original first gear is smaller than the speed corresponding to the original second gear, and the speed corresponding to the original second gear is smaller than the speed corresponding to the original third gear. The speeds corresponding to 011, 101, 110 and 111 are the speeds corresponding to the newly added gears.

6. The fan coil control system according to claim 1, characterized in that: The motor is a permanent magnet synchronous motor.

7. The fan coil control system according to claim 3, characterized in that: There are three control lines, which are used to transmit the first gear position signal, the second gear position signal and the third gear position signal respectively.

8. The fan coil control system according to claim 3, characterized in that: It also includes an optical coupler isolator, the input end of the optical coupler isolator is connected to the output end of the temperature controller, and the output end of the optical coupler isolator is connected to the input end of the rotation speed identification unit.

9. The fan coil control system according to claim 8, characterized in that: The number of the optical couplers is 3, and the optical couplers are in one-to-one correspondence with the first gear position signal, the second gear position signal, and the third gear position signal.

10. The fan coil control system according to claim 1, characterized in that: The temperature controller includes a power supply, a single-chip microcomputer controller and a relay driver. The power supply is connected to the single-chip microcomputer controller, and the single-chip microcomputer controller is connected to the relay driver.

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