Fresh air system and air curtain system

Abstract

The utility model provides a fresh air system and an air curtain system. The fresh air system comprises an exhaust pipeline and at least one air curtain pipeline, the exhaust pipeline is used for exhausting indoor waste gas to the outside through an exhaust outlet, the at least one air curtain pipeline is arranged at a hall of a building, an air inlet of the air curtain pipeline is communicated with the exhaust pipeline, and an air outlet of the air curtain pipeline faces the ground at an entrance of the hall, so that the indoor waste gas is utilized to form an air curtain. The utilization rate of air in the exhaust pipeline of the fresh air system is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air curtains, and in particular to an air curtain system that uses a fresh air system to form an air curtain. Background Technology

[0002] Fresh air system is a widely used system at present, especially in various public places, such as shopping malls, canteens, office buildings, etc., because of the large flow of people, so fresh air system is more needed.

[0003] The existing fresh air system usually includes a fresh air duct that draws outdoor fresh air into the room. The fresh air duct is usually connected in series with a filter device, a dehumidification device, etc., and also includes an exhaust duct that draws indoor exhaust gas to the outside.

[0004] In order to improve the utilization rate of indoor exhaust gas, the existing technology usually exchanges heat between indoor exhaust gas and fresh air entering through the fresh air duct before discharging it. This is a common utilization method. In addition, there is no further utilization, which causes a certain amount of energy waste. Especially in public places with large ventilation volume, it is a pity to discharge it directly to the outside.

[0005] In addition, air conditioning systems are also essential equipment in various public places to meet people's comfort needs. However, due to the large flow of people in most public places, such as shopping malls, canteens, office buildings, etc., their doors cannot be closed all the time and need to be kept open to facilitate people's entry and exit. Therefore, air curtain machines are a common energy-saving equipment in various public places. By opening the air curtain with an air curtain machine, the indoor air can be isolated from the outside air, thereby preventing the loss of indoor cold or heat due to the open door.

[0006] Another function of installing air curtains is that in humid weather, public buildings such as shopping malls, canteens, and office buildings currently use dehumidification air conditioners to dehumidify indoor spaces. However, due to the large flow of people in and out of open places and the frequent opening and closing of doors, humid air will still enter the room in large quantities, condensing into water on the ground at the entrance, causing the ground to be slippery. This problem can be solved to a certain extent by installing air curtains above the door to isolate the indoor and outdoor air. However, the installation position of air curtains (also called air curtains) in most of these places is relatively high, especially when the outdoor air is highly disturbed. When the air reaches the ground, the flow field may not be stable and concentrated, or even cannot be delivered to the ground, resulting in the air curtain effect of the air curtain is not good, condensation is easy to form at the door, the ground is slippery, and there are safety hazards. Moreover, if a very high air supply speed is required to achieve the effect of isolating the indoor and outdoor air, there are also problems such as high energy consumption, high noise, and poor human comfort.

[0007] Therefore, how to further utilize the indoor exhaust gas discharged by the fresh air system is a technical problem to be solved. Contents of utility model

[0008] In order to solve the technical problem of the low utilization rate of indoor waste gas discharged by the fresh air system in the prior art, the present utility model proposes a fresh air system and an air curtain system.

[0009] The fresh air system proposed by the present utility model includes an exhaust duct for discharging indoor waste gas to the outside through an exhaust port, and further includes at least one air curtain duct provided at the entrance hall of a building. The air inlet of the air curtain duct is communicated with the exhaust duct, and the air outlet faces the ground at the entrance of the entrance hall to form an air curtain by using indoor waste gas.

[0010] Furthermore, a booster fan is provided in the air curtain duct.

[0011] Furthermore, an air valve is provided at the air inlet of the air curtain duct and / or at the exhaust port of the exhaust duct.

[0012] The air curtain system proposed by the present utility model includes the fresh air system described in the above technical solution.

[0013] Furthermore, an outer door and an inner door are provided at the entrance of the entrance hall, which are spaced apart to form a transition area. The air outlet of the air curtain duct of the fresh air system faces the ground of the transition area.

[0014] Furthermore, the air curtain system further includes: an air curtain device provided on the outer door.

[0015] Furthermore, the air curtain system further includes:

[0016] An outdoor dew point detector for detecting the dew point temperature outdoors;

[0017] A transition area temperature sensor for detecting the temperature of the transition area;

[0018] A controller for comparing the outdoor dew point temperature with the temperature of the transition area and generating different control signals to control the opening and closing of the inner door and the opening and closing of the air curtain device.

[0019] Furthermore, in summer, when the outdoor dew point temperature is less than the temperature of the transition area, the control module controls the air curtain device to close and the inner door to open; when the outdoor dew point temperature is greater than or equal to the temperature of the transition area, the control module controls the air curtain device to open and the inner door to close.

[0020] Furthermore, the air curtain device is provided with a low gear and a high gear for controlling the wind speed;

[0021] When the outdoor dew point temperature is greater than or equal to the temperature of the transition area, the controller controls the air curtain device to open to the low gear and the inner door to close.

[0022] Furthermore, the air curtain system further includes: a transition area dew point detector for detecting the dew point temperature of the transition area;

[0023] When the air curtain device is turned on to the low gear and the dew point temperature in the transition zone is greater than or equal to the temperature in the transition zone, the controller controls the air curtain device to switch to the high gear;

[0024] When the air curtain device is turned on to the high gear and the dew point temperature in the transition zone is greater than or equal to the temperature in the transition zone, the controller controls the air curtain duct of the fresh air system to form an air curtain.

[0025] The fresh air system of the present utility model is additionally provided with an air curtain duct, and the exhaust gas that needs to be discharged outdoors is used to form an air curtain, so as to further utilize the energy of the fresh air system. On the basis of the fresh air system of the present utility model, the air curtain system of the present utility model adopts a linkage mode of the fresh air system and the air curtain device. The air curtain device initially isolates the indoor and outdoor air on the basis of ensuring energy conservation and comfort. The air in the exhaust duct of the fresh air system is used to supplement and adjust the air pressure in the transition zone to offset the influence of the outdoor disturbance on the air supply of the air curtain device. The flow field is more uniform. At the same time, near the ground, a positive pressure is formed indoors and outdoors in the area that cannot be effectively covered only by the air supply of the air curtain device, preventing the outdoor humid air from entering the transition zone, and it is easy to generate condensed water on the ground of the entrance. By adding the air curtain duct of the fresh air system to form a supplementary air curtain (or called an auxiliary air curtain), this problem can be effectively solved. Brief Description of the Drawings

[0026] The following will describe the present utility model in detail with reference to the embodiments and the drawings, where:

[0027] Figure 1 is a schematic diagram of the air supply flow field of an air curtain in the prior art.

[0028] Figure 2 is a schematic diagram when the air supply flow field of an air curtain in the prior art is disturbed by outdoor air.

[0029] Figure 3 is a schematic diagram of the air flow when the air curtain device and the fresh air system of the present utility model are turned on.

[0030] Figure 4 is a schematic diagram of the structure of an embodiment of the air curtain system of the present utility model.

[0031] Figure 5 is a top view schematic diagram of the layout of the indoor space of an embodiment of the present utility model.

[0032] Figure 6 is a control flow chart of an embodiment of the present utility model.

[0033] Description of the Reference Numerals:

[0034] 1. Air curtain device; 2. Ground; 3. Transition area; 4. Outer door; 5. Inner door; 6. Indoor; 7. Fresh air system; 71. Air curtain duct; 72. Fresh air duct; 73. Exhaust duct. Detailed implementation manners

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0036] Therefore, a feature pointed out in this specification will be used to illustrate one of the features of one embodiment of the present utility model, rather than implying that each embodiment of the present utility model must have the feature described. In addition, it should be noted that this specification describes many features. Although some features may be combined to show possible system designs, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0037] Through research on the fresh air system, the present utility model proposes a new fresh air system. The fresh air system 7 includes a fresh air duct 72, an exhaust duct 73 and an air curtain duct 71, as well as a filtering device, a dehumidifying device, etc. connected in series on the fresh air duct.

[0038] The fresh air duct 72 extracts outdoor fresh air into the room and filters and dehumidifies it through a filtering device and a dehumidifying device. The exhaust duct 73 extracts indoor waste gas to the outside, and may also exchange heat with the fresh air entering from the fresh air duct during the extraction process. The present utility model does not limit the specific filtering, dehumidifying and heat exchange structures of the fresh air system, and these can all adopt the structures in the prior art.

[0039] The air curtain duct 71 of the fresh air system 7 of the present utility model is arranged at the entrance hall of the building. The air curtain duct 71 can be one or multiple, depending on the number of the entrance doors of the entrance hall of the building. The air inlet of the air curtain duct 71 is communicated with the exhaust duct 73, and the air outlet of the air curtain duct 71 faces the ground 2 at the entrance of the entrance hall. The waste gas in the exhaust duct 73 is used to form an air curtain, which not only achieves the purpose of discharging the waste gas, but also plays the role of an air curtain, isolating the indoor air and the outdoor air, avoiding the loss of indoor cold or heat, and improving the energy utilization rate of the fresh air system.

[0040] In a further embodiment, a booster fan is provided in the air curtain duct 71, and the booster fan is used to extract the air in the exhaust duct to form an air curtain. Since in public places such as shopping malls and canteens, the indoor space is usually large, and the size of the lobby is very small relative to the indoor space, the exhaust gas discharged indoors is sufficient to form an air curtain. If the current indoor air quality is good and a large air change rate is not required, since the air curtain duct is connected to the exhaust duct, under the action of the negative pressure formed by the booster fan sucking gas, the outside air can also enter the air curtain duct to form an air curtain, which can effectively supplement the indoor exhaust gas when the amount of indoor exhaust gas is small.

[0041] In one embodiment, an air valve is provided at the air inlet of the air curtain duct 71 and / or at the air outlet of the exhaust duct 73.

[0042] Since the number of the air curtain ducts 71 is set according to the number of the doors at the building lobby, an air valve is provided at the air inlet of each air curtain duct 71, and whether to open the corresponding air valve to form an air curtain can be determined according to the opening and closing state of the corresponding door. In addition, the lengths of different air curtain ducts may also be different. Therefore, by providing an air valve at the air inlet of the air curtain duct, the opening size at the air inlet can be adjusted, so as to adjust the air ratio of the air in the exhaust duct entering each air curtain duct. By providing an air valve at the air outlet of the exhaust duct, when the outdoor air humidity is high and only the indoor exhaust gas is desired to be used to form an air curtain, the air valve at the air outlet of the exhaust duct can be closed.

[0043] The present utility model also protects the corresponding air curtain system, and the air curtain system includes the fresh air system of the above technical solution, that is, the air curtain system forms an air curtain by using the above fresh air system, so as to improve the utilization rate of indoor exhaust gas.

[0044] In a further embodiment, an outer door 4 and an inner door 5 are provided at intervals at the entrance of the lobby of the building of the present utility model, and a transition area 3 is formed between the outer door 4 and the inner door 5. The air outlet of the air curtain duct 71 of the fresh air system 7 faces the ground of the transition area 3, so that the building can form an air curtain made of indoor exhaust gas in the transition area 3.

[0045] On the basis of the above embodiment, the air curtain system of the present utility model further includes an air curtain device 1, and the air curtain device 1 is provided on the outer door 4. When the indoor exhaust gas is insufficient, the air curtain device 1 can be turned on to form an air curtain to avoid the loss of indoor cold or heat. When the indoor exhaust gas is sufficient, the air curtain duct 71 of the fresh air system 7 can also be turned on to form an air curtain.

[0046] Since the fresh air system 7 does not need to discharge indoor waste gas outdoors when the indoor air quality is good, in a preferred embodiment, the air curtain formed by the fresh air system 7 of the present utility model only serves as an auxiliary function, and the air curtain for isolating the internal and external air is mainly formed by the air curtain device 1.

[0047] As described in the background art, when the air curtain is formed by the air curtain device 1, sometimes the installation position is too high, and the air flow direction when it blows to the ground 2 is no longer perpendicular to the ground 2 and is relatively scattered, as Figure 1 shown, or there is no effective air curtain formed at a certain height at the bottom. Moreover, once there is external air disturbance, the function of the bottom of the air curtain formed by the air curtain device is basically very small, as Figure 2 shown. By adopting the technical solution of the present utility model, the air curtain device 1 is used as the main air curtain, and the internal fresh air system 7 can also form an auxiliary air curtain. Even when the indoor air quality is good, the air curtain duct 71 of the fresh air system 7 is opened to form a supplementary air curtain. Due to the isolation of the air curtain generated by the air curtain device 1, the loss of relatively good indoor air is relatively small, and it can also play a role in balancing external air disturbance. See Figure 3 .

[0048] In an embodiment, the air curtain system of the present utility model further includes an outdoor dew point detector, a transition zone temperature sensor, and a controller.

[0049] The outdoor dew point detector is used to detect the outdoor dew point temperature;

[0050] The transition zone temperature sensor is used to detect the transition zone temperature;

[0051] The controller can compare the outdoor dew point temperature with the transition zone temperature and generate different control signals to control the opening and closing of the inner door and the air curtain device.

[0052] By setting an outdoor dew point detector outdoors to detect the outdoor dew point temperature, the opening and closing of the inner door and the air curtain device are controlled, thereby effectively saving energy. For example, when the outdoor air humidity is high and the air curtain is installed relatively high and an effective air curtain cannot be formed near the ground, the outdoor wet air is likely to form condensation in the transition zone, resulting in a slippery ground. Therefore, in this case, the controller can make a judgment and issue different control signals to control the closing of the inner door and the opening of the air curtain device.

[0053] In this embodiment, in summer, when the outdoor dew point temperature is lower than the transition zone temperature, the control module controls the air curtain device to close and the inner door to open. At this time, the outside air is relatively suitable, so the air curtain can be closed and the inner door can be opened. When the outdoor dew point temperature is greater than or equal to the transition zone temperature, the outside air is not very suitable at this time, and condensation is likely to occur in the transition zone. The control module controls the air curtain device to open and the inner door to close, avoiding the loss of indoor cooling capacity and removing the condensation in the transition zone at the same time.

[0054] In a further preferred embodiment, the air curtain device 1 is provided with a low gear and a high gear for controlling the wind speed. When it is initially detected that the outdoor dew point temperature is greater than or equal to the transition zone temperature, the controller controls the air curtain device 1 to open to the low gear and the inner door to close. By turning on the air curtain, the indoor and outdoor air is isolated to avoid the loss of cooling capacity. At the same time, condensation in the transition zone is avoided. If it doesn't work, the air curtain device can be controlled to switch to the high gear.

[0055] In a further embodiment, the air curtain system further includes a transition zone dew point detector for detecting the dew point temperature in the transition zone. When the air curtain device 1 is opened to the low gear and the dew point temperature in the transition zone is greater than or equal to the transition zone temperature, the controller controls the air curtain device 1 to switch to the high gear. Through the transition zone dew point temperature detector, it can be further determined whether the air curtain generated by the air curtain device can effectively eliminate condensation. If not, the air curtain device is switched to the high gear. When the air curtain device 1 is opened to the high gear and the dew point temperature in the transition zone is greater than or equal to the transition zone temperature, the controller controls the air curtain duct 71 of the fresh air system 7 to form an air curtain. When the problem still cannot be solved after the air curtain device 1 is switched to the high gear, at this time, since the air curtain device 1 has played a role in initially isolating the indoor and outdoor air, when the fresh air system 7 is turned on at this time, even if there is insufficient indoor waste gas, extracting the relatively good-quality air indoors to form an air curtain will not cause a large loss. However, it has a good effect on preventing the disturbance of the outdoor air to the air curtain and preventing the formation of condensation on the ground in the transition zone.

[0056] Next Figure 4 Fig. shows a structural schematic diagram of the air curtain system of the present invention. The fresh air system 7 in the figure has a dehumidification function, can introduce outdoor fresh air, discharge indoor waste gas to the outside, or form an air curtain in the transition zone, and its booster fan can be steplessly speed-regulated.

[0057] On the right side of the transition area 3 in the figure is the outer door 4, and on the left side is the inner door 5. Since the indoor 6 space is large, it is difficult and slow to adjust the air pressure, and frequent adjustment of the air pressure for a long time will also affect the comfort. Therefore, a transition area 3 is set between the indoor hall and the entrance gate. The space of the transition area 3 is as small as possible to quickly adjust the internal air pressure. Multiple transition areas can be set for simultaneous use when the flow of people is large. When there are multiple air curtain ducts 71, the air supply volume of each duct can be controlled by a proportional air valve. See Figure 5 , Figure 5 In

[0058] , there are 4 outer doors leading from the indoor to the outside, and there are also 4 corresponding inner doors. Between the outer door 4 and the inner door 5 is the transition area 3. An air curtain device is installed on the outer door 4. Temperature and humidity sensors, an outdoor dew point detector, and a pressure sensor are respectively installed at the ground of the transition area and the outdoor door entrance for detecting the outdoor air temperature, humidity, dew point temperature, the temperature, humidity, and dew point temperature of the transition area, and the outdoor air pressure.

[0059] The information of these sensors can all be given to the controller, and then the controller controls the corresponding components of the air curtain device and the fresh air system according to these signals.

[0060] As Figure 6 shown, a reasonable pressure difference range P between a transition area and the outside is preset, which can not only prevent outdoor air from entering the indoor but also ensure human comfort; a maximum wind speed N of the air curtain machine is preset to ensure human comfort and avoid overloading of the air curtain machine.

[0061] Detect the outdoor dew point temperature and compare it with the temperature of the transition area. If the outdoor dew point temperature is less than the temperature of the transition area, the air curtain device closes the air curtain and the inner door is always open.

[0062] If the outdoor dew point temperature is greater than the temperature of the transition area, the air curtain device starts to operate at a low gear wind speed, the inner door remains closed, and the control is carried out in the following manner.

[0063] Detect the dew point temperature and the temperature of the transition area every time interval t to judge whether condensation may occur.

[0064] If condensation may occur, it means that the air sent by the air curtain device has not been effectively sent to the ground, or the flow field at the ground is disturbed by the outside air, causing the outside air to enter the transition area. Then control the air curtain device to switch to the high gear until the dew point temperature and the temperature of the transition area meet the condition that condensation will not occur.

[0065] If the wind speed of the air curtain device reaches the maximum wind speed, but still fails to meet the condition of no condensation, it means that the air curtain device cannot isolate the indoor and outdoor air. Then open the air valve of the air curtain duct of the fresh air system, and dynamically adjust the air supply volume by adjusting the air valve opening and the speed of the booster fan until the reasonable pressure difference range P is reached.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A fresh air system, comprising an exhaust duct for discharging indoor exhaust gas to the outdoors through an exhaust port, characterized in that: It also includes at least one air curtain duct arranged at the foyer of the building, the air inlet of the air curtain duct is connected with the exhaust duct, and the air outlet faces the ground at the entrance of the foyer, so as to form an air curtain with indoor exhaust gas.

2. The fresh air system according to claim 1, characterized in that: A booster fan is arranged in the air curtain duct.

3. The fresh air system according to claim 1, characterized in that: An air valve is provided at the air inlet of the air curtain duct and / or the air outlet of the exhaust duct.

4. An air curtain system, characterized in that: Comprising the fresh air system as described in any one of claims 1 to 3.

5. The air curtain system according to claim 4, characterized in that: The entrance to the foyer is provided with an outer door and an inner door spaced apart to form a transition zone, and an air outlet of the air curtain duct of the fresh air system faces the ground of the transition zone.

6. The air curtain system according to claim 5, characterized in that: The air curtain system further comprises: an air curtain device arranged on the outer door.

7. The air curtain system according to claim 6, characterized in that: The air curtain system also includes: Outdoor dew point detector, used to detect outdoor dew point temperature; A transition zone temperature sensor, used for detecting the temperature of the transition zone; The controller compares the outdoor dew point temperature with the transition zone temperature and generates different control signals to control the opening and closing of the inner door and the opening and closing of the air curtain device.

8. The air curtain system according to claim 7, characterized in that: In summer, when the outdoor dew point temperature is lower than the transition zone temperature, the control module controls the air curtain device to close and the inner door to open; when the outdoor dew point temperature is greater than or equal to the transition zone temperature, the control module controls the air curtain device to open and the inner door to close.

9. The air curtain system according to claim 7, characterized in that: The air curtain device is provided with a low gear position and a high gear position for controlling the wind speed; When the outdoor dew point temperature is greater than or equal to the transition zone temperature, the controller controls the air curtain device to open to a low gear position and the inner door is closed.

10. The air curtain system according to claim 9, characterized in that: The air curtain system further comprises: a transition zone dew point detector for detecting the dew point temperature of the transition zone; When the air curtain device is opened to a low gear, and the dew point temperature of the transition zone is greater than or equal to the transition zone temperature, the controller controls the air curtain device to switch to a high gear; When the air curtain device is opened to a high gear, and the dew point temperature of the transition zone is greater than or equal to the transition zone temperature, the controller controls the air curtain duct of the fresh air system to form an air curtain.

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