Air conditioning system

Abstract

The utility model discloses an air conditioning system which comprises an air duct, a heat exchange coil, a water supply pipeline, a water return pipeline, an air valve, an air valve actuator and a Pitot tube. The air duct comprises an air duct air outlet section and an air duct air inlet section of which the end parts are communicated, and the outer end of the air duct air outlet section is an air supply outlet; the outer end of the air duct air inlet section is a fresh air opening; the air duct air inlet section communicates with an air return outlet of the air return pipeline, and an inlet of the air return pipeline communicates with the indoor space. A heat exchange coil is wound outside the air outlet section of the air duct, an inlet of the heat exchange coil is communicated with the water supply pipeline, and an outlet of the heat exchange coil is communicated with the water return pipeline; an air valve is mounted in the air duct air inlet section; a Pitot tube is installed at an inlet of the air inlet section of the air duct, the end of the Pitot tube is connected with a pressure guide tube arranged on the outer wall of the air duct, and the pressure guide tube is connected with an air valve actuator. The air conditioner has the advantages that the air valve is designed in the air pipe to adjust the fresh air volume, the Pitot tube is designed to measure the air speed, and air volume adjustment and water volume adjustment can be combined to jointly achieve regulation and control of the indoor temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] With the improvement of living standards, the application of air conditioning systems is becoming more and more widespread. The air conditioning system is composed of multiple components such as air conditioners, related water valves, etc. However, since the existing conventional air conditioners mostly adjust the supply air temperature by adjusting the water volume, the current conventional air conditioner water valve usually adopts a dynamic balance electric regulating valve, which adjusts the opening of the water valve according to the setting and measured deviation of the supply air temperature to make the supply air temperature reach the required value. When switching between winter and summer, the maximum water flow rate needs to be reset on site, and the starting pressure difference is required. The supply and return water temperature difference cannot be effectively determined, and there may be a problem of large flow and small temperature difference; and the method of adjusting the temperature only by water volume is single and has poor flexibility.

[0003] Therefore, it is necessary to improve the prior art. Summary of the invention

[0004] The purpose of the utility model is to provide an air conditioning system to solve the problem of single temperature adjustment mode and poor flexibility of the existing air conditioning system in view of the shortcomings of the prior art.

[0005] The technical solution adopted by the utility model is: an air conditioning system, including an air duct, a heat exchange coil, a water supply pipeline, a water return pipeline, an air valve and an air valve actuator;

[0006] The air duct includes an air outlet section and an air inlet section connected at the ends, the outer end of the air outlet section is an air supply outlet connected to the indoor room; the outer end of the air inlet section is a fresh air outlet connected to the outdoor room;

[0007] The air inlet section of the air duct is connected to the return air outlet of the return air duct, and the inlet of the return air duct is connected to the room;

[0008] A heat exchange coil is provided in the air outlet section of the air duct, the inlet of the heat exchange coil is connected to the water supply pipeline, and the outlet of the heat exchange coil is connected to the return water pipeline; water valves are respectively provided on the return water pipelines, and the water valves are connected to corresponding water valve actuators;

[0009] An air valve is installed in the air inlet section of the air duct, and the air valve includes a valve shaft and a valve plate installed on the valve shaft, and the size of the valve plate is adapted to the cross-sectional size of the air duct; one end of the valve shaft extends out of the air duct and is connected to the output end of the air valve actuator outside the air duct, and the air valve actuator drives the valve shaft and the valve plate to rotate;

[0010] A Pitot tube is installed at the entrance of the air inlet section of the air duct, and the end of the Pitot tube is connected to a pressure-conducting pipe arranged on the outer wall of the air duct, and the pressure-conducting pipe is connected to the air valve actuator.

[0011] According to the above solution, a mixed air temperature detection element is provided at the inlet of the air outlet section of the air duct.

[0012] According to the above scheme, a fan is arranged in the air inlet section of the air duct, the fan is arranged downstream of the air valve, the inlet of the fan is located on one side of the air valve, and the outlet of the fan is located on the air outlet side.

[0013] According to the above solution, the fan is a variable frequency fan.

[0014] According to the above solution, a return water flow monitoring element and a return water temperature detection element are also provided on the return water pipeline.

[0015] According to the above solution, a water supply temperature detection element is also provided on the water supply pipeline.

[0016] According to the above scheme, an indoor return air temperature detection element is provided at the return air outlet.

[0017] According to the above scheme, the indoor return air temperature detection element, the mixed air temperature detection element, the return water temperature detection element and the supply water temperature detection element are all temperature sensors.

[0018] According to the above solution, the return water flow monitoring element is an ultrasonic flow meter.

[0019] The beneficial effects of the utility model are:

[0020] 1. The utility model designs an air valve in the air duct to adjust the fresh air volume, and designs a Pitot tube to measure the wind speed. Compared with the existing technology, the air volume regulation can be combined with the water volume regulation to jointly achieve the regulation of indoor temperature; the indoor temperature can also be regulated by air volume regulation alone. Compared with the existing technology, this design has various temperature regulation methods and good flexibility.

[0021] 2. In the utility model, the indoor temperature is regulated by matching the air volume regulation with the water volume regulation. There is no need to re-set the maximum water flow of the water valve in winter and summer, thus reducing the later operation and maintenance time.

[0022] 3. The utility model is designed with a supply and return water temperature detection element to monitor the supply and return water temperatures in real time to ensure that the water temperature difference in the supply and return water pipelines is not lower than the set minimum temperature difference. Once the temperature difference between the two is detected to be lower than the set minimum temperature difference, the water valve actuator opens a small valve opening to reduce the water flow and restore to an appropriate temperature difference to avoid the phenomenon of large flow and small temperature difference.

[0023] 4. The utility model adopts an ultrasonic flow meter to measure the water side flow, so that it can be stabilized at the required water volume. It does not rely on the mechanical pressure stabilization and flow stabilization method, does not need to start the pressure difference, and controls the flow more accurately.

[0024] 5. The utility model adopts a Pitot tube to measure the air volume and designs a variable frequency fan, which is energy-saving and environmentally friendly and can achieve precise adjustment of the air volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a specific embodiment of the utility model.

[0026] In the figure: 1. Air duct inlet section; 2. Air duct outlet section; 3. Heat exchange coil; 4. Return air outlet; 5. Air valve actuator; 6. Pressure pipe; 7. Supply air outlet; 8. Mixed air temperature detection element; 9. Fan; 10. Air valve; 11. Pitot tube; 12. Fresh air outlet; 13. Return water flow monitoring element; 14. Return water temperature detection element; 15. Air filter; 16. Water valve; 17. Water valve actuator; 18. Water supply pipeline; 19. Water supply temperature detection element; 20. Return water pipeline; 21. Indoor return air temperature detection element; 22. Supply air temperature detection element. DETAILED DESCRIPTION

[0027] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] like Figure 1 An air conditioning system shown is specifically a variable air volume and variable water volume air conditioning system, including an air duct, a heat exchange coil 3, a water supply pipeline 18, a return water pipeline 20, a damper 10 and a damper actuator 5;

[0029] The air duct comprises an air duct outlet section 2 and an air duct inlet section 1 connected at the inner end. The outer end of the air duct outlet section 2 is an air supply port 7 connected to the room for supplying air to the room. The outer end of the air duct inlet section 1 is a fresh air port 12 connected to the outside.

[0030] The air inlet section 1 of the air duct is connected to the return air outlet 4 of the return air duct, and the inlet of the return air duct is connected to the room;

[0031] The air outlet section 2 of the air duct is provided with a heat exchange coil 3, the inlet of the heat exchange coil 3 is connected to the water supply pipeline 18, and the outlet of the heat exchange coil 3 is connected to the return water pipeline 20; the return water pipeline 20 is respectively provided with a water valve 16, and the water valve 16 is connected to the corresponding water valve actuator 17;

[0032] An air valve 10 is installed in the air inlet section 1 of the air duct, and the air valve 10 includes a valve shaft and a valve plate installed on the valve shaft, and the size of the valve plate is adapted to the cross-sectional size of the air duct; one end of the valve shaft extends out of the air duct and is connected to the output end of the air valve actuator 5 outside the air duct, and the air valve actuator 5 drives the valve shaft and the valve plate to rotate;

[0033] A Pitot tube 11 is installed at the entrance of the air inlet section 1 of the air duct, and the end of the Pitot tube 11 is connected to a pressure-conducting pipe 6 arranged on the outer wall of the air duct, and the pressure-conducting pipe 6 is connected to the air valve actuator 5.

[0034] In the present invention, the air volume in the air duct is adjusted by controlling the rotation angle of the valve plate: when the valve plate rotates to be perpendicular to the air duct cross section and the valve plate covers the entire air duct cross section, the inside of the air duct is not connected; when the valve plate rotates to be parallel to the air duct cross section, the inside of the air duct circulates, and the air volume is maximum at this time. In the present invention, the Pitot tube 11 is arranged upstream of the air valve 10, and the Pitot tube 11 is used to detect the static pressure and dynamic pressure of the air valve 10, which are transmitted to the air valve actuator 5 by the pressure pipe 6, and the air valve actuator 5 obtains the air volume in the air duct. The structure and function of the air valve actuator 5 and the water valve actuator 17 are mature technologies in the industry and will not be repeated here.

[0035] In the utility model, the return air outlet 4 and the fresh air outlet 12 are both arranged at the entrance of the air inlet section 11 of the air duct. The indoor return air and the outdoor fresh air are mixed in the air duct inlet section 1, and heat is exchanged with the water in the heat exchange coil 3, and finally air is supplied to the room through the air supply outlet 7 of the air duct.

[0036] Preferably, an indoor return air temperature detection element 21 is installed at the return air outlet 4 of the return air duct to detect the indoor return air temperature.

[0037] Preferably, an air supply temperature detection element 22 is provided at the air supply port 7 for detecting the air supply temperature.

[0038] Preferably, a mixed air temperature detection element 8 is provided at the inlet of the air outlet section 2 of the air duct for detecting the mixed air temperature (the temperature after the outdoor fresh air and the indoor return air are mixed).

[0039] In the present invention, the mixed air temperature detection element 8 is arranged in the air duct corresponding to the starting section of the heat exchange coil 3 .

[0040] Preferably, a fan 9 is provided in the air inlet section 1 of the air duct, and the fan 9 is arranged downstream of the air valve 10 , the inlet of the fan 9 is located on one side of the air valve 10 , and the outlet of the fan 9 is located on the side of the air supply port 7 .

[0041] In the present invention, the fan 9 is a variable frequency fan 9; the arrangement of the variable frequency fan 9 can improve the air circulation in the air duct and adjust the air volume.

[0042] Preferably, the return water pipeline 20 is further provided with a return water flow monitoring element 13 and a return water temperature detection element 14, which are used to detect the return water flow and the return water temperature respectively.

[0043] Preferably, the water supply pipeline 18 is also provided with a water supply temperature detection element 19 for detecting the water supply temperature.

[0044] In the present invention, the indoor return air temperature detection element 21, the mixed air temperature detection element 8, the return water temperature detection element 14 and the supply water temperature detection element 19 can all be temperature sensors; the return water flow monitoring element 13 can be an ultrasonic flow meter.

[0045] Preferably, an air filter 15 is installed at the entrance of the air inlet section 1 of the air duct to filter the air entering the air duct.

[0046] The working principle of the utility model is as follows: after the fresh air and the return air are mixed, the heat exchange coil 3 in the air outlet section 2 of the air duct exchanges heat with the cold / hot water from the water supply pipe. After the supply air reaches the supply air temperature setting range, it is delivered to the indoor environment. When there is a deviation between the indoor temperature demand (indoor setting temperature range) and the actual indoor temperature, the air valve actuator 5 adjusts the air volume by adjusting the opening of the air valve 10, so that the indoor temperature reaches the indoor setting temperature range; through the joint regulation of variable water volume and variable air volume, the indoor temperature reaches the set target range.

[0047] In the present invention, the air conditioning system can also be configured with a PLC controller, which is connected to each detection element to obtain the corresponding temperature information sent by each temperature detection element; the PLC controller is connected to each actuator to control the opening and closing of the corresponding valve through the actuator. After the fresh air and the return air are mixed, they are heat exchanged with the cold / hot water from the water supply pipe 18 in the air outlet section of the air duct, so that the supply air reaches the supply air temperature setting range before being sent to the indoor environment. When the indoor temperature demand (indoor setting temperature range) deviates from the actual indoor temperature, the air valve actuator 5 adjusts the air volume by adjusting the opening of the air valve 10, so that the indoor temperature reaches the indoor setting temperature range; the Pitot tube 11 measures the static pressure and dynamic pressure in the air duct, which are transmitted to the air valve actuator 5 by the pressure pipe 6. The air valve actuator 5 calculates the air volume in the air duct, and feeds back the air volume signal and the valve opening signal to the PLC controller. The PLC controller can manually set the supply air temperature value, and at the same time collect the temperature value of the mixed air temperature sensor point according to the measured air volume signal , the wind temperature difference before and after heat exchange, wind heat capacity and other parameters are used to calculate the heat exchange amount on the wind side. This part of the heat exchange amount comes from the cold / hot water in the water supply pipe 18. Therefore, the PLC controller gives the required heat exchange amount on the wind side as the set value of the heat exchange amount supplied on the water side to the water valve actuator 17. The intelligent water valve actuator 17 calculates the water side heat exchange amount according to the supply and return water temperature difference, water flow rate and water heat capacity, and calculates the deviation between the actual heat exchange amount on the water side and the required heat exchange amount on the wind side, controls the opening of the water valve 16 to match the demand with the supply, and completes the automatic control process of the air-conditioning system. Since the air-conditioning system is controlled according to the heat exchange amount, instead of the traditional air supply temperature controlling the opening of the water valve 16, there is no need to manually reset the maximum flow in winter and summer, thus reducing the time for later operation and maintenance debugging.

[0048] In the present invention, the return water temperature detection element 14 and the supply water temperature detection element 19 monitor the supply and return water temperature difference in real time to ensure that it is not lower than the set minimum temperature difference. Once it is found that the temperature difference is lower than the set minimum temperature difference, the staff can reduce the opening of the water valve 16 through the water valve actuator 17 to restore the temperature difference to a reasonable range, thereby eliminating the phenomenon of large flow and small temperature difference.

[0049] In the utility model, when the required heat exchange amount on the wind side matches the supplied heat exchange amount on the water side, the water flow rate measured by the return water flow monitoring element 13 is the water flow rate required by the air-conditioning system. When the water system produces pressure fluctuations, the required water flow rate is offset. The return water flow monitoring element 13 feeds back the deviation to the water valve actuator 17, which will adjust the opening of the water valve 16 again to restore the flow rate to the required value, thereby coping with dynamic hydraulic imbalance of the water system.

[0050] In the present invention, the PLC controller collects the opening signal of the air valve 10. When the opening continues to be at a large value or a small value, it means that the air volume may be insufficient or sufficient, and the fan 9 needs to be frequency-controlled, thereby realizing frequency control of the fan 9 and effectively reducing energy consumption.

[0051] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0052] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: Including air duct, heat exchange coil, water supply pipeline, water return pipeline, air valve, air valve actuator and Pitot tube; The air duct includes an air outlet section and an air inlet section connected at the ends, the outer end of the air outlet section is an air supply outlet connected to the indoor room; the outer end of the air inlet section is a fresh air outlet connected to the outdoor room; The air inlet section of the air duct is connected to the return air outlet of the return air duct, and the inlet of the return air duct is connected to the room; A heat exchange coil is wound around the outside of the air outlet section of the air duct, the inlet of the heat exchange coil is connected to the water supply pipeline, and the outlet of the heat exchange coil is connected to the return water pipeline; water valves are respectively provided on the return water pipelines, and the water valves are connected to corresponding water valve actuators; An air valve is installed in the air inlet section of the air duct, and the air valve includes a valve shaft and a valve plate installed on the valve shaft, and the size of the valve plate is adapted to the cross-sectional size of the air duct; one end of the valve shaft extends out of the air duct and is connected to the output end of the air valve actuator outside the air duct, and the air valve actuator drives the valve shaft and the valve plate to rotate; A Pitot tube is installed at the entrance of the air inlet section of the air duct, and the end of the Pitot tube is connected to a pressure-conducting pipe arranged on the outer wall of the air duct, and the pressure-conducting pipe is connected to the air valve actuator.

2. The air conditioning system according to claim 1, characterized in that: A mixed air temperature detection element is provided at the inlet of the air outlet section of the air duct.

3. The air conditioning system according to claim 1, characterized in that: A fan is arranged in the air inlet section of the air duct, and the fan is arranged downstream of the air valve. The inlet of the fan is located on one side of the air valve, and the outlet of the fan is located on the air supply port side.

4. The air conditioning system according to claim 3, characterized in that: The fan is a variable frequency fan.

5. The air conditioning system according to claim 2, characterized in that: The return water pipeline is also provided with a return water flow monitoring element and a return water temperature detection element.

6. The air conditioning system according to claim 5, characterized in that: The water supply pipeline is also provided with a water supply temperature detection element.

7. The air conditioning system according to claim 6, characterized in that: An indoor return air temperature detection element is provided at the return air outlet.

8. The air conditioning system according to claim 7, characterized in that: The indoor return air temperature detection element, the mixed air temperature detection element, the return water temperature detection element and the supply water temperature detection element are all temperature sensors.

9. The air conditioning system according to claim 5, characterized in that: The return water flow monitoring element is an ultrasonic flow meter.

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