Condensation fan stable air volume control system
The air volume control system composed of a wind pressure transmitter and a frequency converter solves the problem of unstable air volume of the condensing fan caused by changes in external wind pressure, achieves the stability and safety of the fan's air supply volume, and improves the condensing effect and the operating performance of the refrigeration system.
Patent Information
- Application Number
- CN202423062865.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-12
AI Technical Summary
In an open-air environment, the condensing fan's air volume is unstable due to changes in wind pressure on the windward side, affecting the condensing effect and refrigeration system performance.
Adopt wind pressure transmitter, controller, frequency converter and control circuit, detect wind pressure change through wind pressure transmitter, control frequency converter to adjust fan impeller speed, combine wind pressure switch and delay control circuit to realize stable air volume control.
When the external wind pressure changes, the fan air supply volume is kept stable, frequent speed adjustment is avoided, the control accuracy and safety are improved, and the condensation effect and stable operation of the refrigeration system are ensured.
Smart Images
Figure CN223469457U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of fan, specifically a kind of condensing fan stable air volume control system. BACKGROUND
[0002] The role of condensing fan is to provide power for air flow, force air conditioner to flow through condensing pipeline in refrigeration system at a certain speed, so that condensing pipeline makes external air forced convection heat exchange, so that high-temperature and high-pressure refrigerant in it is condensed into liquid, to enter the next refrigeration process, this process is generally referred to as condensation process in refrigeration cycle. Condensation effect is proportional to the air volume of condensing fan;The greater the air volume, the better the condensation effect, the better the refrigeration system runs;The smaller the air volume, the worse the condensation effect, the worse the refrigeration system runs.
[0003] In actual refrigeration project operation, air-cooled condenser is generally installed in open environment, and the wind pressure of the windward surface of condensing fan changes greatly due to environmental changes;When the wind pressure of the windward surface increases due to weather changes, the outlet pressure of the fan is forced to increase, so that the air volume decreases, so that the condensation effect decreases, and the refrigeration system runs worse. SUMMARY
[0004] The utility model provides another condensing fan stable air volume control system that can adapt to external wind pressure change to regulate and control air volume stability.
[0005] The technical scheme adopted by the utility model is: a kind of condensing fan stable air volume control system, including power supply and fan, characterized by: still including wind pressure transmitter, controller, frequency converter and regulation and control circuit, wind pressure transmitter is set to fan impeller outside, wind pressure transmitter is connected with controller, controller is connected with frequency converter, the regulation and control circuit includes regulation and control power supply, regulation and control power supply is connected with fan starting circuit, wind pressure transmission circuit and delay regulation and control circuit in parallel, fan starting circuit includes fan thermal relay, fan start button, fan stop button and fan contactor that are connected in turn, fan starting button is connected with fan contactor first normally open switch in parallel, wind pressure transmission circuit is connected with wind pressure transmitter switch and intermediate relay in turn, delay regulation and control circuit includes fan contactor second normally open switch, intermediate relay switch and delay relay that are connected in turn, power supply is connected with fan motor through relay delay normally closed switch, delay relay delay normally open switch and frequency converter are connected in series and then connected in parallel on delay relay delay normally closed switch.
[0006] Still including wind pressure switch, wind pressure switch is set to fan impeller outside, and wind pressure switch is connected on delay regulation and control circuit.
[0007] Still including front and rear wind pressure switches, front and rear wind pressure switches are respectively set to fan impeller outside and inside, front wind pressure switch is connected on delay regulation and control circuit, and rear wind pressure switch is connected with controller.
[0008] The frequency converter is a VFD frequency converter.
[0009] The utility model discloses a beneficial effect is:
[0010] 1, adopt the wind pressure transmitter to detect the wind pressure change of fan inlet outside, and the wind pressure value is converted into electric signal and is sent controller, and the controller exports the frequency converter to control the fan motor frequency conversion, satisfies the fan impeller speed regulation and control under the wind pressure change situation outside the fan, realizes the regulation and control of stable air volume.
[0011] 2, when the fan starting button is pressed, the regulation and control power supply sends the fan contactor, after the fan starts, if the wind pressure transmitter detects that the wind pressure change exceeds the range that will influence the fan impeller air supply, the wind pressure transmitter switch is closed, the intermediate relay gets electricity, the intermediate relay normally open switch is closed, the fan contactor second normally open switch is closed and the delay control circuit is cut off, the delay relay of delay control circuit gets electricity, when the wind pressure transmitter continuously monitors the wind pressure change, the delay relay delays for a period of time, the delay relay delay normally open switch is closed, the delay relay delay normally closed switch is opened, the power supply and the frequency converter are connected, the frequency converter controls the fan motor frequency conversion, avoids the fan motor frequent speed regulation under the condition of unstable wind pressure, and it is favorable to ensure the stability of fan air supply and the use safety of fan.
[0012] 3, adopt the front and rear wind pressure switch, under the condition that the fan has wind pressure or the rear wind pressure switch detects the fan impeller air supply wind pressure change, only then can the delay control circuit be connected to frequency conversion control fan speed, and the control precision is further improved.
[0013] 4, the fan thermal relay of fan starting circuit is used to the thermal protection of fan, avoids the thermal damage of fan motor overspeed due to too small wind pressure, and improves control safety. ACCOUT OF DRAWINGS
[0014] Figure 1 It is control principle diagram for the utility model embodiment one;
[0015] Figure 2 It is control principle diagram for the utility model embodiment two.
[0016] In the drawing: power supply 1, wind pressure transmitter 2, controller 3, frequency converter 4, fan impeller 5, fan motor 6, regulation and control power supply 7, fan thermal relay 8, fan starting button 9, fan shutdown button 10, fan contactor 11, fan contactor first normally open switch 12, fan contactor second normally open switch 13, wind pressure transmitter switch 14, intermediate relay 15, intermediate relay switch 16, delay relay 17, delay relay delay normally open switch 18, delay relay delay normally closed switch 19, front wind pressure switch 20, rear wind pressure switch 21. DETAILED DESCRIPTION
[0017] The application will be further described in conjunction with the accompanying drawings and examples.
[0018] Figure 1 The embodiment one is a condenser fan stable air volume control system, comprising a power supply 1, a wind pressure transmitter 2, a controller 3, a frequency converter 4, a fan impeller 5, a fan motor 6, a regulating power supply 7, a fan thermal relay 8, a fan start button 9, a fan stop button 10, a fan contactor 11, a fan contactor first normally open switch 12, a fan contactor second normally open switch 13, a wind pressure transmitter switch 14, an intermediate relay 15, an intermediate relay switch 16, a delay relay 17, a delay relay delay normally open switch 18, and a delay relay delay normally closed switch 19.
[0019] The wind pressure transmitter 2 is arranged outside the fan impeller 5, the wind pressure transmitter 2 is connected to the controller 3, the controller 3 is connected to the frequency converter 4, the regulating power supply 7 is connected in parallel to the fan start circuit, the wind pressure transmitting circuit and the delay regulating circuit, the fan start circuit comprises the fan thermal relay 8, the fan start button 9, the fan stop button 10 and the fan contactor 11 connected in series, the fan start button is connected in parallel to the fan contactor first normally open switch 12, the wind pressure transmitting circuit is connected in series to the wind pressure transmitter switch 14 and the intermediate relay 15, the delay regulating circuit comprises the fan contactor second normally open switch 13, the intermediate relay switch 16 and the delay relay 17 connected in series, the power supply 1 is connected to the fan motor 6 through the delay relay delay normally closed switch 19, the delay relay delay normally open switch 18 and the frequency converter 4 are connected in series and connected in parallel to the delay relay delay normally closed switch 19.
[0020] Figure 2 The embodiment two is a condenser fan stable air volume control system, compared with the embodiment one,
[0021] Further comprising front and rear wind pressure switches 20 and 21, the front and rear wind pressure switches are arranged outside and inside the fan impeller respectively, the front wind pressure switch 20 is connected to the delay regulating circuit, and the rear wind pressure switch 21 is connected to the controller 3.
[0022] In the above embodiment, the frequency converter is a VFD frequency converter.
Claims
1. A condensing fan stable air volume control system comprising a power supply and a fan, characterized by: The fan also comprises a wind pressure transmitter, a controller, a frequency converter and a regulating circuit, the wind pressure transmitter is arranged outside the fan impeller, the wind pressure transmitter is connected to the controller, the controller is connected to the frequency converter, the regulating power supply of the regulating circuit is connected in parallel with a fan starting circuit, a wind pressure transmitting circuit and a time-delay regulating circuit, the fan starting circuit comprises a fan thermal relay, a fan starting button, a fan stopping button and a fan contactor connected in series, the fan starting button is connected in parallel with a first normally open switch of the fan contactor, the wind pressure transmitting circuit is connected in series with a wind pressure transmitter switch and an intermediate relay, the time-delay regulating circuit comprises a second normally open switch of the fan contactor, an intermediate relay switch and a time-delay relay connected in series, the power supply is connected to the fan motor through a time-delay normally closed switch of the intermediate relay, the time-delay relay is connected in series with a time-delay normally open switch and the frequency converter and is connected in parallel with a time-delay normally closed switch of the time-delay relay.
2. The condensing fan stable air volume control system of claim 1, wherein: The fan also comprises a wind pressure switch, the wind pressure switch is arranged outside the fan impeller and is connected to the time-delay regulating circuit.
3. The condenser fan stable air volume control system of claim 1, wherein: The fan also comprises front and rear wind pressure switches, the front and rear wind pressure switches are arranged outside and inside the fan impeller respectively, the front wind pressure switch is connected to the time-delay regulating circuit, and the rear wind pressure switch is connected to the controller.
4. The condenser fan stable air volume control system of claim 1, wherein: The frequency converter is a VFD frequency converter.