Filter element self-cleaning air conditioning system and control method

Abstract

The invention discloses a filter element self-cleaning air conditioning system and a control method. The filter element self-cleaning air conditioning system comprises a controller and a device body connected with the controller. The device body comprises an outer circulation filter element, an outer circulation air duct, an inner and outer circulation switching box, an air blower, a return air switching box, an evaporation box, a return air duct connected with the return air switching box and a monitoring device arranged in the outer circulation air duct which are connected in sequence; the internal and external circulation switching box is further provided with an internal and external circulation switching air door. The return air switching box is further provided with a return air switching air door. The controller is connected with the monitoring device, further connected with the air blower, the internal and external circulation switching air door and the return air switching air door and used for controlling the device body to enter a filter element self-cleaning mode. When the filter element is blocked, the controller controls the device body to switch the filter element cleaning mode, air inlet of the evaporation box is cut off, air enters the air return duct from the inner circulation air inlet through the air blower and is reversely blown out towards the outer circulation filter element through the outer circulation air duct, and the effect of cleaning the filter element is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning systems, and in particular to a filter element self-cleaning air conditioning system and a control method. Background Art

[0002] The air conditioning system is an indispensable and important part of all types of construction machinery. It undertakes the key tasks of regulating the temperature in the cab, maintaining a suitable environment, and significantly improving the air quality in the cab.

[0003] Especially in the application scenarios of heavy construction machinery such as excavators, the working environment is often accompanied by a lot of dust and the content of particulate matter in the air is extremely high. In this case, the air circulation filter of the air conditioning system is very easy to be contaminated and quickly blocked, which will not only seriously hinder the air circulation efficiency, but also cause the cooling or heating effect of the air conditioning system to be greatly reduced, thus affecting the air quality and temperature control in the cab.

[0004] At present, the fresh air filtration system of the air-conditioning system is installed on the side of the cab, which contains a filter element to filter the air, but has no self-cleaning function. In addition, the filter element needs to be replaced regularly or cleaned manually to ensure the filtering effect. The maintenance cost is high, and maintenance cannot be performed according to the blockage condition of the filter element.

[0005] In order to effectively address this problem, improve the continuous operation capability of the air-conditioning system and maintain a good environment in the cab, it is necessary to add a self-cleaning function to the external circulation filter element in the air-conditioning system. Summary of the invention

[0006] The object of the present invention is to provide a filter element self-cleaning air conditioning system and control method, which can realize the self-cleaning function of the external circulation filter element, without the need for manual cleaning and maintenance, and can be maintained according to the filter element blockage condition, with lower maintenance costs.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a filter element self-cleaning air conditioning system, comprising: a controller, a device body connected to the controller; The device body comprises: an external circulation filter element, an external circulation air duct, an internal and external circulation switching box, a blower, a return air switching box, an evaporator box, a return air duct and a monitoring device; the air inlet of the external circulation air duct is connected to the external circulation filter element, and the air outlet of the external circulation air duct is connected to the external circulation air inlet of the internal and external circulation switching box; the internal and external circulation switching box is also provided with an internal circulation air inlet and an internal and external circulation switching damper; the air inlet of the blower is connected to the air outlet of the internal and external circulation switching box, and the air outlet of the blower is connected to the air inlet of the return air switching box; the return air switching box is provided with air outlet one and air outlet two, air outlet one is connected to the air inlet of the evaporator box, and air outlet two is connected to the entrance of the return air duct; the outlet of the return air duct is connected to the return air inlet of the external circulation air duct; the return air switching box is also provided with a return air switching damper for switching the filter element cleaning mode; the evaporator box is provided with an air outlet; the monitoring device is arranged at the air inlet of the external circulation air duct; The controller is connected to a monitoring device for monitoring the wind speed at the air inlet of the external circulation air duct; The controller is connected to the blower and is used to control the blower to supply air; The controller is connected to the internal and external circulation switching damper and the return air switching damper, and is used to control the device body to enter the filter element self-cleaning mode.

[0008] Optionally, the air conditioning system further comprises a display module, which is connected to the controller and is used for receiving a prompt signal issued by the controller.

[0009] Optionally, the monitoring device is a wind speed sensor.

[0010] Optionally, when the device body enters the filter element self-cleaning mode, the internal and external circulation switching damper rotates to the external circulation air inlet of the internal and external circulation switching box, and the external circulation air inlet is cut off; the return air switching damper rotates to the air outlet 1 of the return air switching box, and the air inlet of the evaporator box is cut off; the air enters the evaporator box from the external circulation filter element through the external circulation air duct and the blower, and flows out from the air outlet of the evaporator box.

[0011] In a second aspect, the present invention provides a filter element self-cleaning air conditioning control method, which is implemented by the filter element self-cleaning air conditioning system as described in the first aspect, and comprises: Obtaining the real-time wind speed at the air inlet of the external circulation air duct of the device body; Based on the real-time wind speed, when the real-time wind speed at the air inlet is lower than a preset value, the control device body enters the filter element self-cleaning mode; After the device body has passed through the filter element self-cleaning mode, a judgment is made again based on the real-time wind speed. When the real-time wind speed at the air inlet is still lower than the preset value, a prompt signal is issued indicating that the external circulation filter element needs to be replaced.

[0012] Optionally, the control method further includes: receiving a prompt signal sent by the control module based on the display module, and displaying it to the user to remind the user to replace the external circulation filter element.

[0013] Optionally, the real-time wind speed at the air inlet of the external circulation air duct is detected by a monitoring device in the air conditioning device.

[0014] Optionally, the step of controlling the device body to enter the filter element self-cleaning mode includes: Turn the internal and external circulation switching damper to the external circulation air inlet of the internal and external circulation switching box; Turn the return air switch damper to the air outlet 1 of the return air switch box; Start the blower to supply air.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a filter element self-cleaning air conditioning system and a control method. The self-cleaning air conditioning system is provided with a return air switching box and a return air duct in front of the air inlet of the evaporator box of the conventional air conditioning system, and a detection device is added at the outer circulation air duct to detect the wind speed at the outer circulation air inlet; when the wind speed is lower than a preset value, it is judged that the filter element is blocked, and the controller controls the device body to switch the filter element cleaning mode, the air inlet of the evaporator box is cut off, and the wind enters the return air duct from the inner circulation air inlet through the blower, and is blown out in the opposite direction to the outer circulation filter element through the outer circulation air duct, so as to achieve the effect of cleaning the filter element and realize the self-cleaning function of the outer circulation filter element. The system does not need manual cleaning and maintenance, and can be maintained according to the blockage of the filter element, so the maintenance cost is lower. A filter element self-cleaning air-conditioning system and control method provided by the present invention can realize the self-cleaning function of the external circulation filter element, automatically perform efficient and thorough cleaning operations on the filter element, thereby effectively removing accumulated impurities such as dust and particulate matter, and restoring the filtering performance of the filter element; in addition, it can not only significantly extend the service life of the filter element, reduce the replacement frequency and cost, but also ensure that the air-conditioning system always maintains the best working condition, providing the driver with a fresher and healthier driving space.

[0016] A filter element self-cleaning air conditioning system provided by the present invention is also provided with a display module. After the external circulation filter element is self-cleaned, if the controller still determines that the filter element is blocked, it can remind the user to replace the filter element according to the blockage condition of the filter element, thereby improving the overall performance of the construction machinery and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure shows a schematic diagram of the structure of the device body in a filter element self-cleaning air conditioning system in one embodiment of the present invention; Figure 2 The figure shows a structural block diagram of a filter element self-cleaning air conditioning system in one embodiment of the present invention; Figure 3 Shown is a schematic cross-sectional view of a device body in one embodiment of the present invention; Figure 4 The figure shows a schematic diagram of an internal circulation air supply mode in an embodiment of the present invention; Figure 5 The figure shows a schematic diagram of an internal and external circulation air supply mode in an embodiment of the present invention; Figure 6 Shown is a schematic diagram of a filter element self-cleaning mode in an embodiment of the present invention; Figure 7 Shown is a flow chart of a filter element self-cleaning air conditioning control method in an embodiment of the present invention.

[0018] In the figure: 100, external circulation filter element; 200, external circulation air duct; 300, internal and external circulation switching box; 400, blower; 500, return air switching box; 600, evaporator; 700, return air duct; 201, monitoring device; 202, return air inlet; 301, internal circulation air inlet; 302, internal and external circulation switching damper; 303, external circulation air inlet; 401, blower air inlet; 402, blower air outlet; 501, air outlet one; 502, return air switching damper; 503, air outlet two; 601, evaporator air outlet. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0020] The embodiment of the present invention introduces a filter element self-cleaning air conditioning system, such as Figure 1-3 As shown, including: The present invention provides a filter element self-cleaning air conditioning system, comprising: a controller, a device body connected to the controller; The device body comprises: an external circulation filter element 100, an external circulation air duct 200, an internal and external circulation switching box 300, a blower 400, a return air switching box 500, an evaporation box 600, a return air duct 700 and a monitoring device 201; the air inlet of the external circulation air duct 200 is connected to the external circulation filter element 100, and the air outlet of the external circulation air duct 200 is connected to the external circulation air inlet 303 of the internal and external circulation switching box 300; the internal and external circulation switching box 300 is also provided with an internal circulation air inlet 301 and an internal and external circulation switching damper 302; the air inlet 401 of the blower is connected to the air outlet of the internal and external circulation switching box 300, The air outlet 402 of the blower is connected to the air inlet of the return air switching box 500; the return air switching box 500 is provided with an air outlet 1 501 and an air outlet 2 503, the air outlet 1 501 is connected to the air inlet of the evaporation box 600, and the air outlet 2 503 is connected to the entrance of the return air duct 700; the outlet of the return air duct 700 is connected to the return air inlet 202 of the external circulation air duct 200; the return air switching box 500 is also provided with a return air switching damper 502 for switching the filter element cleaning mode; the evaporation box 600 is provided with an air outlet 601; the monitoring device 201 is arranged at the air inlet of the external circulation air duct 200; The controller is connected to a monitoring device 201 for monitoring the wind speed at the air inlet of the external circulation air duct; The controller is connected to the blower 400 and is used to control the blower to supply air; The controller is connected to the internal and external circulation switching damper 302 and the return air switching damper 502, and is used to control the device body to enter the filter element self-cleaning mode.

[0021] Specifically, the controller is connected to the monitoring device 201, receives the wind speed data of the detection device 201, and determines whether the external circulation filter element 100 is blocked based on the wind speed data; based on the judgment result, the control device body enters the filter element self-cleaning mode, performs filter element self-cleaning, and cuts off the air inlet of the evaporator 600. The wind enters the return air duct 700 from the internal circulation air inlet through the blower 400, and is blown out to the external circulation filter element 100 in the opposite direction through the external circulation air duct 200, thereby cleaning the filter element. There is no need for manual cleaning and maintenance, and the maintenance cost is lower.

[0022] In this embodiment, if Figure 2As shown, a filter element self-cleaning air conditioning system provided by the present invention also includes a display module, which is connected to the controller and is used to receive a prompt signal from the controller. Specifically, after the controller controls the filter element self-cleaning mode of the device body, it is judged again whether the external circulation filter element 100 is blocked. If it is still blocked, that is, the wind speed is less than the preset value, a prompt signal is sent to the display module; the display module receives the prompt signal and displays "the filter element needs to be replaced" to remind the user to manually replace the filter element; the display module of the present invention and the setting of the controller reduce the number of times the filter element needs to be replaced, saving the maintenance cost of the air conditioning system; In this embodiment, the monitoring device is a wind speed sensor.

[0023] In this embodiment, if Figure 4 As shown, the internal and external circulation switching damper 302 and the return air switching damper 502 can also be used to switch the device body to the internal circulation air supply mode, specifically including: the internal and external circulation switching damper 302 rotates to the external circulation air inlet 303 of the internal and external circulation switching box 300, because the external circulation air inlet 303 is closed by the internal and external circulation switching damper 302, the external circulation air entering from the external circulation air duct 200 is cut off, and the air can only enter from the internal circulation air inlet 301 of the internal and external circulation switching box 300; the return air switching damper 502 rotates to the return air switching box 500 The air outlet 2 503 is closed by the return air switching damper 502, and the entrance of the return air duct 700 connected to the air outlet 2 503 is also closed, and the return air is cut off. The wind passing through the return air switching box 500 can only enter the evaporator 600 through the air outlet 1 501 and flow out from the air outlet 601 of the evaporator; specifically, the wind enters from the internal circulation air inlet 301 of the internal and external circulation switching box 300 through the blower 400, and is then transported to the evaporator 600 by the blower 400, and flows out from the air outlet 601 of the evaporator.

[0024] In this embodiment, if Figure 5As shown, the internal and external circulation switching damper 302 and the return air switching damper 502 can also be used to switch the device body to the external circulation air supply mode, specifically including: the internal and external circulation switching damper 302 rotates to the internal circulation air inlet 301 of the internal and external circulation switching box 300, because the internal circulation air inlet 301 is closed by the internal and external circulation switching damper 302, the internal circulation air intake is cut off, and the air can only enter from the external circulation air inlet 303 of the internal and external circulation switching box 300; the return air switching damper 502 rotates to the air outlet 2 503 of the return air switching box 500, because the air outlet 2 503 When the return air switching damper 502 is closed, the entrance of the return air duct 700 connected to the air outlet 503 is also closed, the return air is cut off, and the wind passing through the return air switching box 500 can only enter the evaporator 600 through the air outlet 501 and flow out from the air outlet 601 of the evaporator; specifically, the wind passes through the external circulation filter element 100 through the external circulation air duct 200, enters the external circulation switching box 300, and enters the blower 400 from the air outlet of the external circulation switching box 300, and is then transported to the evaporator 600 by the blower 400 and flows out from the air outlet 601 of the evaporator.

[0025] In this embodiment, if Figure 6 As shown, when the device body enters the filter element self-cleaning mode, the internal and external circulation switching damper 302 rotates to the external circulation air inlet 303 of the internal and external circulation switching box 300. Since the external circulation air inlet 303 is closed by the internal and external circulation switching damper 302, the external circulation air entering from the external circulation air duct 200 is cut off, and the wind can only enter from the internal circulation air inlet 301 of the internal and external circulation switching box 300; the return air switching damper 502 rotates to the air outlet 501 of the return air switching box 500. Since the air outlet 501 is closed by the return air switching damper 502, the return air switching damper 502 rotates to the air outlet 501 of the return air switching box 500. The air inlet of the evaporator box 600 connected to the first 501 is also closed, and the air inlet of the evaporator box 600 is cut off. The wind passing through the return air switching box 500 can only enter the return air duct 700 through the second air outlet 503, and enter the return air inlet of the external circulation air duct 200 through the return air duct 700, and flow out from the external circulation filter element 100; specifically, the air enters from the internal circulation air inlet 301 of the internal and external circulation switching box 300 through the blower 400, and is then transported to the return air duct 700 by the blower 400, and is blown out in the opposite direction to the external circulation filter element 100 through the external circulation air duct 200. Example 2

[0026] like Figure 7 As shown, the embodiment of the present invention introduces a filter element self-cleaning air conditioning control method, which is implemented by the filter element self-cleaning air conditioning system as described in Example 1, and includes: S01: Obtaining the real-time wind speed at the air inlet of the external circulation air duct of the device body; S02: judging based on the real-time wind speed, when the real-time wind speed at the air inlet is lower than a preset value, the control device body enters a filter element self-cleaning mode; S03: After the device body has passed through the filter element self-cleaning mode, a judgment is made again based on the real-time wind speed. When the real-time wind speed at the air inlet is still lower than the preset value, a prompt signal is issued indicating that the external circulation filter element needs to be replaced.

[0027] Specifically, the control method further includes: receiving a prompt signal sent by the control module based on the display module, and displaying it to the user to remind the user to replace the external circulation filter element.

[0028] Specifically, the real-time wind speed at the air inlet of the external circulation air duct is detected by a monitoring device in the air conditioning device.

[0029] Specifically, the step of controlling the device body to enter the filter element self-cleaning mode includes: Turn the internal and external circulation switching damper to the external circulation air inlet of the internal and external circulation switching box; Turn the return air switch damper to the air outlet 1 of the return air switch box; Start the blower to supply air.

[0030] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A filter element self-cleaning air conditioning system, characterized in that: include: A controller and a device body connected to the controller; The device body comprises: an external circulation filter element, an external circulation air duct, an internal and external circulation switching box, a blower, a return air switching box, an evaporator box, a return air duct and a monitoring device; the air inlet of the external circulation air duct is connected to the external circulation filter element, and the air outlet of the external circulation air duct is connected to the external circulation air inlet of the internal and external circulation switching box; the internal and external circulation switching box is also provided with an internal circulation air inlet and an internal and external circulation switching damper; the air inlet of the blower is connected to the air outlet of the internal and external circulation switching box, and the air outlet of the blower is connected to the air inlet of the return air switching box; the return air switching box is provided with air outlet one and air outlet two, air outlet one is connected to the air inlet of the evaporator box, and air outlet two is connected to the entrance of the return air duct; the outlet of the return air duct is connected to the return air inlet of the external circulation air duct; the return air switching box is also provided with a return air switching damper for switching the filter element cleaning mode; the evaporator box is provided with an air outlet; the monitoring device is arranged at the air inlet of the external circulation air duct; The controller is connected to a monitoring device for monitoring the wind speed at the air inlet of the external circulation air duct; The controller is connected to the blower and is used to control the blower to supply air; The controller is connected to the internal and external circulation switching damper and the return air switching damper, and is used to control the device body to enter the filter element self-cleaning mode.

2. The filter element self-cleaning air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a display module, which is connected to the controller and is used for receiving a prompt signal sent by the controller.

3. The filter element self-cleaning air conditioning system according to claim 2, characterized in that: The monitoring device is a wind speed sensor.

4. The filter element self-cleaning air conditioning system according to claim 3, characterized in that: When the device body enters the filter element self-cleaning mode, the internal and external circulation switching damper rotates to the external circulation air inlet of the internal and external circulation switching box, and the external circulation air inlet is cut off; the return air switching damper rotates to the air outlet 1 of the return air switching box, and the air inlet of the evaporator is cut off; the air enters the return air duct from the internal circulation air inlet through the blower, and is blown out in the opposite direction to the external circulation filter element through the external circulation air duct.

5. A filter element self-cleaning air conditioner control method, characterized in that: The method is implemented by a filter element self-cleaning air conditioning system according to any one of claims 1 to 4, comprising: Obtaining the real-time wind speed at the air inlet of the external circulation air duct of the device body; Based on the real-time wind speed, when the real-time wind speed at the air inlet is lower than a preset value, the control device body enters the filter element self-cleaning mode; After the device body has passed through the filter element self-cleaning mode, a judgment is made again based on the real-time wind speed. When the real-time wind speed at the air inlet is still lower than the preset value, a prompt signal is issued indicating that the external circulation filter element needs to be replaced.

6. The filter element self-cleaning air conditioner control method according to claim 5, characterized in that: The control method further includes: receiving a prompt signal sent by the control module based on the display module, and displaying it to the user to remind the user to replace the external circulation filter element.

7. The filter element self-cleaning air conditioner control method according to claim 6, characterized in that: The real-time wind speed at the air inlet of the external circulation air duct is detected by a monitoring device in the air conditioning device.

8. The filter element self-cleaning air conditioner control method according to claim 7, characterized in that: The step of controlling the device body to enter the filter element self-cleaning mode comprises: Turn the internal and external circulation switching damper to the external circulation air inlet of the internal and external circulation switching box; Turn the return air switch damper to the air outlet 1 of the return air switch box; Start the blower to supply air.

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