An air conditioning filtration system

Abstract

The application provides an air conditioner filtering system, and particularly relates to the technical field of air conditioners. The air conditioner filtering system comprises a first channel, an electric ball valve, a filter and a one-way valve arranged in sequence on the first channel; when the electric ball valve is in a first state, the electric ball valve communicates a first end of the filter with an inlet of a medium, and when the electric ball valve is in a second state, the electric ball valve communicates the first end of the filter with the atmosphere; a second end of the filter is communicated with an outlet of the medium through the one-way valve; a second channel, a first end of the second channel is communicated with the inlet, and a second end of the second channel is communicated with the outlet; a first control valve is arranged on the second channel; a control device is used for detecting a pressure difference between two ends of the filter; in the case that the pressure difference is less than or equal to a preset threshold value, the electric ball valve is controlled to be in the first state, and the first control valve is controlled to be in a closed state; in the case that the pressure difference is greater than the preset threshold value, the electric ball valve is controlled to be switched to the second state, and the first control valve is controlled to be switched to an open state.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, and particularly relates to an air conditioner filtering system. BACKGROUND

[0002] At present, air conditioners are more and more widely used in people's daily life, and various air conditioners are suitable for different places, including cabinet air conditioners, hanging air conditioners, water air conditioners, window air conditioners, central air conditioners and multi-split air conditioners.

[0003] However, during the operation of the air conditioning system, impurities in the flow passage will gradually accumulate at the inlet of the filter, and as the amount of impurities increases, the flow passage of the filter will become smaller or even be blocked, thereby causing the air conditioning system to malfunction.

[0004] In the prior art, the filter is usually removed after power-off, cleaned and then reinstalled for power-on operation. Not only does this need to suspend the operation of the air conditioning system, affecting the working efficiency of the air conditioning system, but also requires manual removal of the filter for cleaning, which is time-consuming and labor-intensive. SUMMARY

[0005] Embodiments of the present application provide a filtering system for automatically cleaning when impurities in the filter reach a cleaning standard.

[0006] To achieve the above object, the embodiments of the present application adopt the following technical solutions:

[0007] The air conditioner filtering system provided by the embodiments of the present application comprises:

[0008] A first passage, on which an electric ball valve, a filter and a check valve are sequentially arranged; when the electric ball valve is in a first state, the electric ball valve communicates a first end of the filter with an inlet of a medium, and when the electric ball valve is in a second state, the electric ball valve communicates the first end of the filter with the atmosphere; a second end of the filter communicates with an outlet of the medium through the check valve; the filter is used for filtering the medium; and the check valve is used for preventing the medium from flowing back;

[0009] A second passage, a first end of the second passage communicates with the inlet, and a second end of the second passage communicates with the outlet; a first control valve is arranged on the second passage, and the first control valve is used for opening or closing the second passage;

[0010] A control device is used for detecting a pressure difference between two ends of the filter; in a case where the pressure difference is less than or equal to a preset threshold value, the electric ball valve is controlled to be in the first state, and the first control valve is controlled to be in a closed state; in a case where the pressure difference is greater than the preset threshold value, the electric ball valve is controlled to be switched to the second state, and the first control valve is controlled to be switched to an open state.

[0011] The technical scheme provided by the embodiments of the present application brings at least the following beneficial effects: the air conditioner filtering system in the embodiments of the present application is provided with two passages, so that when the first passage is blocked, the second passage is enabled, thereby ensuring the normal operation of the air conditioner filtering system. When the control device detects that the pressure difference between the two ends of the filter is less than or equal to a preset threshold, it indicates that the impurities in the first passage do not reach the cleaning standard. At this time, the first passage is enabled and the second passage is not enabled, and the electric ball valve connects the first end of the filter with the inlet of the medium, so that the medium flows to the outlet of the medium after being filtered by the filter. When the control device detects that the pressure difference between the two ends of the filter is greater than the preset threshold, it indicates that the impurities in the first passage reach the cleaning standard, and the impurities in the first passage need to be cleaned to prevent damage to the air conditioning system. To this end, the second passage is enabled, and the control device controls the first control valve to open, so that the medium flows from the inlet to the outlet through the second passage.

[0012] Meanwhile, the control device controls the electric ball valve to connect the first end of the filter with the atmosphere. Since the air pressure in the first passage is higher than the atmospheric pressure, the impurities in the first passage will be discharged through the electric ball valve to complete the automatic cleaning of the first passage. The one-way valve is connected with the second end of the filter, which can prevent the medium from flowing back and prevent the medium in the second passage from flowing into the atmosphere. In this way, on the one hand, the second passage is enabled when the first passage is blocked, which can ensure the continuous operation of the air conditioning system and improve the working efficiency of the air conditioning system. On the other hand, when the second passage is enabled, the impurities in the first passage will be automatically discharged, without the need for the user to clean, thereby providing convenience for the user.

[0013] In some embodiments, the air conditioner filtering system further comprises: a pressure difference control unit, the pressure difference control unit is configured to detect the pressure difference between the two ends of the filter; when the detected pressure difference is less than or equal to a preset threshold, the electric ball valve is controlled to be in a first state; when the detected pressure difference is greater than the preset threshold, the electric ball valve is controlled to switch to a second state; a pressure control unit, the pressure control unit is configured to detect the pressure value between the electric ball valve and the filter; when the detected pressure value is within a preset pressure range, the first control valve is controlled to be in an open state; when the detected pressure value is outside the preset pressure range, the first control valve is controlled to switch to a closed state.

[0014] From the above embodiments, the pressure difference control unit can control the electric ball valve according to the detected pressure difference between the two ends of the filter, so as to control whether the first end of the filter is connected to the medium inlet or the atmosphere. When the first passage is enabled, the first end of the filter needs to be connected to the medium inlet, so that the medium passes through the filter for filtering; when the first passage is not enabled, the first end of the filter needs to be connected to the atmosphere, so that the medium in the first passage is discharged. In order to improve the working quality of the air conditioner filtering system, after the blockage in the first passage is cleaned, the second passage needs to be disabled and the first passage needs to be started. For this purpose, the pressure control unit can detect the pressure between the electric ball valve and the filter. When the detected pressure value is within the preset pressure range, it indicates that there is a blockage in the first passage, and at this time, the pressure control unit controls the first control valve to open, so that the medium flows out through the second passage; when the detected pressure value is outside the preset range, it indicates that there is no blockage in the first passage, and at this time, the pressure control unit controls the first control valve to close, so that the second passage is disabled.

[0015] In some embodiments, the pressure difference control unit in the air conditioner filtering system is also used to trigger the pressure control unit to detect the pressure value between the electric ball valve and the filter when the detected pressure difference is greater than the preset threshold; the pressure control unit is also used to trigger the pressure difference control unit to detect the pressure difference between the two ends of the filter when the detected pressure value is outside the preset pressure range.

[0016] From the above embodiments, when the pressure difference detected by the pressure difference control unit is less than or equal to the preset value, it indicates that the first passage does not reach the cleaning standard, and at this time, the pressure value between the electric ball valve and the filter must be within the preset pressure range, so the pressure control unit does not need to be triggered to detect the pressure value between the electric ball valve and the filter. Only when the pressure difference detected by the pressure difference control unit is greater than the preset value, the pressure control unit needs to be triggered to detect the pressure value between the electric ball valve and the filter, in order to determine whether the impurities in the first passage are cleaned. When the impurities in the first passage are cleaned, the pressure control unit detects that the pressure value is outside the preset pressure range, the pressure difference between the two ends of the filter returns to less than or equal to the preset threshold, and at this time, the pressure difference control unit is triggered to detect the pressure difference between the two ends of the filter, so that the pressure difference control unit controls the electric ball valve to connect the first end of the filter to the medium inlet, thereby re-enabling the first passage.

[0017] In some embodiments, the differential pressure control unit in the air conditioner filtering system comprises a differential pressure switch; the differential pressure switch has a normally closed point and a normally open point; the normally closed point of the differential pressure switch is electrically connected with the first contact point of the electric ball valve, and the normally open point of the differential pressure switch is electrically connected with the second contact point of the electric ball valve; wherein, when the detected differential pressure of the differential pressure switch is less than or equal to a preset threshold value, the normally closed point of the differential pressure switch is closed, the normally open point of the differential pressure switch is opened, and the first contact point of the electric ball valve is electrified, after the first contact point of the electric ball valve is electrified, the electric ball valve switches to the first state; when the detected differential pressure of the differential pressure switch is greater than the preset threshold value, the normally closed point of the differential pressure switch is opened, the normally open point of the differential pressure switch is closed, and the second contact point of the electric ball valve is electrified, after the second contact point of the electric ball valve is electrified, the electric ball valve switches to the second state.

[0018] As can be seen from the above embodiments, when the differential pressure between the two ends of the filter is less than or equal to a preset threshold value, the normally closed point of the differential pressure switch is closed and the normally open point is opened, at this time, the first contact point of the electric ball valve electrically connected with the normally closed point of the differential pressure switch is electrified to communicate the first end of the filter with the inlet of the medium; when the differential pressure between the two ends of the filter is greater than the preset threshold value, the normally closed point of the differential pressure switch is opened and the normally open point is closed, at this time, the second contact point of the electric ball valve electrically connected with the normally open point of the differential pressure switch is electrified to communicate the first end of the filter with the atmosphere. Thus, the differential pressure control unit controls the electric ball valve according to the detected differential pressure between the two ends of the filter.

[0019] In some embodiments, the differential pressure control unit in the air conditioner filtering system further comprises a second control valve and a third control valve: the second control valve is arranged between the differential pressure switch and the first end of the filter, and the third control valve is arranged between the differential pressure switch and the second end of the filter; the normally closed point of the differential pressure switch is further electrically connected with the second control valve and the third control valve; when the normally closed point of the differential pressure switch is closed and the normally open point of the differential pressure switch is opened, the second control valve and the third control valve are opened so that the differential pressure detected by the differential pressure switch is the differential pressure between the two ends of the filter; when the normally closed point of the differential pressure switch is opened and the normally open point of the differential pressure switch is closed, the second control valve and the third control valve are closed.

[0020] As can be seen from the above embodiments, when the differential pressure between the two ends of the filter is less than or equal to a preset threshold value, the second control valve and the third control valve electrically connected with the normally closed point of the differential pressure switch are opened, so that the medium between the two ends of the filter can pass through the second control valve and the third control valve to reach the detection point of the differential pressure switch; when the differential pressure between the two ends of the filter is greater than the preset threshold value, the first passage needs to be disabled for cleaning the impurities in the first passage, since the normally closed point of the differential pressure switch is opened, the second control valve and the third control valve electrically connected with the normally closed point of the differential pressure switch are closed, so that the differential pressure detected by the differential pressure switch is in a stable state, to prevent the differential pressure between the two ends of the filter from changing when the first passage is automatically cleaned, thereby causing the differential pressure switch to fluctuate and causing certain safety hazards.

[0021] In some embodiments, the pressure control unit in the air conditioner filter system comprises a pressure switch for detecting the pressure value between the electric ball valve and the filter; the pressure switch has a normally closed point and a normally open point; the normally closed point of the pressure switch is electrically connected with the first control valve; when the pressure value is within the preset pressure range, the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is opened, and the first control valve is opened; when the pressure value is outside the preset pressure range, the normally closed point of the pressure switch is opened and the normally open point of the pressure switch is closed, and the first control valve is closed.

[0022] As can be seen from the above embodiments, the pressure switch controls the closing and opening of the normally closed point and the normally open point through the detected pressure value, thereby controlling the opening or closing of the first control valve electrically connected with the normally closed point of the pressure switch, and further controlling the enabling or disabling of the second passage.

[0023] In some embodiments, the normally open point of the pressure switch is electrically connected with the differential pressure switch; the pressure switch is used for detecting the pressure value between the electric ball valve and the filter when the normally open point of the differential pressure switch is closed.

[0024] As can be seen from the above embodiments, the pressure switch is electrically connected with the normally open point of the differential pressure switch, which means that the pressure switch is powered when the differential pressure detected by the differential pressure switch is greater than the preset threshold, and then starts to detect the pressure value between the electric ball valve and the filter to determine whether the impurities in the first passage are cleaned up.

[0025] In some embodiments, the pressure control unit in the air conditioner filter system further comprises a fourth control valve; the first end of the fourth control valve is connected with the second control valve, and the second end of the fourth control valve is connected with the third control valve; when the fourth control valve is opened, the differential pressure detected by the differential pressure switch is less than or equal to the preset threshold; the normally open point of the pressure switch is electrically connected with the fourth control valve; when the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is opened, the fourth control valve is closed; when the normally closed point of the pressure switch is opened and the normally open point of the pressure switch is closed, the fourth control valve is opened.

[0026] As can be seen from the above embodiments, since the fourth control valve is arranged between the second control valve and the third control valve, when the fourth control valve is opened, the pressure values between the second control valve and the third control valve are the same, the differential pressure detected by the differential pressure switch is less than or equal to the preset threshold, and then the first passage is opened. Therefore, when the pressure value detected by the pressure switch is within the preset range, the normally closed point of the pressure switch is closed and the normally open point is opened, so that the fourth control valve electrically connected with the normally open point of the pressure switch is closed; when the pressure value detected by the pressure switch is outside the preset range, the normally open point of the pressure switch is closed and the normally closed point is opened, so that the fourth control valve is opened.

[0027] In some embodiments, the air conditioner filtering system further comprises a fifth control valve, a first end of the fifth control valve being connected with the second interface of the electric ball valve, and a second end of the fifth control valve being connected with the atmosphere; a time relay, a first end of the time relay being electrically connected with the normally open point of the differential pressure switch, and a second end of the time relay being electrically connected with the fifth control valve; when the normally open point of the differential pressure switch is closed, the time relay is turned on; and the time relay is used to control the fifth control valve to be turned on after a preset time length.

[0028] As can be seen from the above embodiments, when the fifth control valve is turned on, the first end of the filter can be in communication with the atmosphere through the electric ball valve. The electric action of the second contact point of the electric ball valve needs a certain time, so that the first end of the filter can be in communication with the inlet of the medium or the atmosphere smoothly. In this regard, by setting the time relay, the fifth control valve is controlled to be turned on after the time relay is turned on for a preset time length, so that the action of the electric ball valve can be ensured to be completed. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0030] Figure 1 A structural schematic diagram of an air conditioner system is provided for the embodiments of the present application;

[0031] Figure 2 Another structural schematic diagram of an air conditioner system is provided for the embodiments of the present application;

[0032] Figure 3 A structural schematic diagram of an air conditioner filtering device is provided for the embodiments of the present application;

[0033] Figure 4 A structural schematic diagram of an electric ball valve is provided for the embodiments of the present application;

[0034] Figure 5 Another structural schematic diagram of an air conditioner filtering device is provided for the embodiments of the present application;

[0035] Figure 6 Another structural schematic diagram of an air conditioner filtering device is provided for the embodiments of the present application;

[0036] Figure 7 Another structural schematic diagram of an air conditioner filtering device is provided for the embodiments of the present application;

[0037] Figure 8 Another structural schematic diagram of an air conditioner filtering device is provided for the embodiments of the present application;

[0038] Figure 9A flowchart of a control method of an air conditioner filter device according to an embodiment of the present application is provided.

[0039] Figure 10 A hardware structure diagram of a controller according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0041] In the description of the present application, it should be understood that the terms “center”, “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] The terms “first” and “second” are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with “first” and “second” can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of “a plurality of” is two or more.

[0043] The term “and / or” in this document is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone.

[0044] In the description of the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the terms “connected” and “connected” should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, when describing the pipeline, “connected” and “connected” in the present application have the meaning of conducting. The specific meaning needs to be understood in combination with the context.

[0045] The terms "including," "having," and any variations thereof mentioned in the description of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include other steps or units not listed, or may optionally include other steps or units inherent to the process, method, product, or apparatus.

[0046] Furthermore, in the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] As described in the background, during operation of an air conditioning system, impurities in the flow path gradually accumulate at the filter inlet. As the amount of impurities accumulates, the filter's flow path becomes smaller or even clogged, causing the air conditioning system to malfunction. In existing technology, the filter is often removed after a power outage, cleaned, and then reinstalled before powering on. This not only requires the air conditioning system to suspend operation, affecting its efficiency, but also requires manual filter removal and cleaning, which is time-consuming and labor-intensive.

[0048] In light of this, an embodiment of the present application provides an air conditioning filtration system with two pathways. When the first pathway becomes blocked, the first pathway is disabled and the second pathway is enabled, thereby ensuring the normal operation of the air conditioning filtration system. Furthermore, when the first pathway is disabled, impurities in the first pathway are flushed back into the atmosphere by the pressure within the pathway, thereby achieving automatic cleaning of the first pathway. After the impurities in the first pathway are cleared, the media pathway switches from the second pathway to the first pathway, thereby completing the automatic cleaning of the air conditioning filtration system while ensuring its efficient operation.

[0049] Among them, the air-conditioning system provided in the embodiment of the present application can be a cabinet air conditioner, a wall-mounted air conditioner, a water air conditioner, a window air conditioner, a central air conditioner and a multi-split air conditioner, and the embodiment of the present application does not impose any restrictions on this.

[0050] To further describe the technical solutions of the embodiments of the present application, Figure 1 Shown is a structural diagram of an air-conditioning system provided in an embodiment of the present application.

[0051] Reference Figure 1 The air conditioning system 1 includes an indoor unit 10, an outdoor unit 20, connecting pipes 30 and a controller 40 (the controller 40 is not shown in the figure).

[0052] In some embodiments, the indoor unit 10 can be an indoor hanging unit or an indoor cabinet unit. Take the indoor hanging unit (shown in FIG. 1) as an example, the indoor hanging unit is usually installed on an indoor wall surface. Figure 1

[0053] In some embodiments, as shown in FIG. 1, the indoor unit 10 includes an indoor heat exchanger 101 for exchanging heat with indoor air, so as to realize cooling or heating of the indoor air. Figure 2

[0054] In some embodiments, the outdoor unit 20 is usually arranged outdoors for assisting the indoor environment heat exchange. In addition, as shown in FIG. 1, the outdoor unit 20 is represented by a dashed line because the outdoor unit 20 is located on the opposite side of the indoor unit 10 through a wall surface. Figure 1

[0055] In some embodiments, a connection pipe 30 is arranged between the indoor unit 10 and the outdoor unit 20 for connecting the indoor unit 10 and the outdoor unit 20 to form a medium flow circuit for circulating medium.

[0056] In some embodiments, the controller 40 refers to a device that can generate operation control signals according to instruction operation codes and timing signals, and instruct the air conditioning system 1 to execute control instructions. For example, the controller 40 can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The controller 40 can also be other devices with processing functions, such as a circuit, a device, or a software module, and the embodiments of the present application do not make any limitation in this regard.

[0057] In some embodiments, the controller 40 can be a microcontroller unit (MCU). The MCU is also called a single chip microcomputer or a single chip microprocessor. The frequency and specifications of the central processing unit are appropriately reduced, and the memory, timer, USB, A / D conversion, UART, PLC, DMA, and even LCD driving circuit are integrated on a single chip to form a chip-level computer for different application scenarios to make different combinations of control.

[0058] ​​​In addition, the controller 40 can be configured to control the operation of the components in the air conditioning system 1 so that the components in the air conditioning system 1 operate to achieve the predetermined functions of the air conditioning system 1.

[0059] In some embodiments, the air conditioning system 1 continues to operate as shown in Figure 2 The outdoor unit 20 includes a compressor 201, a gas-liquid separator 202, an outdoor heat exchanger 203, an air conditioning filter system 204, a throttling device 205, and a four-way reversing valve 206.

[0060] In some embodiments, the compressor 201 is disposed in the outdoor unit 20 and is configured to provide power for the circulation of the medium.

[0061] In some embodiments, the gas-liquid separator 202 is connected to the suction port of the compressor 201 and is configured to accommodate the medium in the liquid return portion of the medium passage to prevent liquid impact on the compressor 201.

[0062] In some embodiments, the outdoor heat exchanger 203 is connected to the discharge port of the compressor 201 through the four-way reversing valve 206 and is configured to exchange heat between the medium flowing in the heat transfer tube of the outdoor heat exchanger 203 and the outdoor air.

[0063] In some embodiments, the throttling device 205 is disposed between the outdoor heat exchanger 203 and the indoor heat exchanger 101 and has the effect of expanding the medium flowing through the throttling device 205 to achieve pressure reduction, thereby adjusting the flow rate of the medium in the medium passage. Alternatively, the throttling device 205 can be an electronic expansion valve.

[0064] In some embodiments, the air conditioning filter system 204 is located between the indoor heat exchanger 101 and the throttling device 205, as shown in Figure 3 The air conditioning filter system 204 can include a first passage, a second passage, and a control device.

[0065] In some embodiments, the first passage includes an electric ball valve 2041, a filter 2042, and a check valve 2043. When the first passage is enabled, the medium flows from the inlet of the medium through the electric ball valve 2041, the filter 2042, and the check valve 2043 in sequence and then flows out from the outlet of the medium. The inlet of the medium is connected to the throttling device 205, and the outlet of the medium is connected to the indoor heat exchanger 101.

[0066] In some embodiments, the filter 2041 is configured to filter impurities in the flowing medium, which can prevent the existence of impurities from causing blockage of the circulation passage and thus causing the air conditioning system to malfunction and hinder the normal operation of the air conditioning system.

[0067] In some embodiments, the electric ball valve 2041 is connected to the filter 2042 to connect the first end of the filter 2042 to the medium inlet or the atmosphere. The electric ball valve 2041 can have a first state and a second state. When the electric ball valve 2041 is in the first state, the electric ball valve 2041 connects the first end of the filter 2042 to the medium inlet. When the electric ball valve 2041 is in the second state, the electric ball valve 2041 connects the first end of the filter 2042 to the atmosphere.

[0068] For example, Figure 4 As shown, the electric ball valve 2041 is a T-type electric ball valve, which includes a T-type pipeline. The T-type pipeline can be rotated to adjust the opening position of the T-type pipeline. Figure 4 The T-type electric ball valve shown in the figure includes a first contact a and a second contact b. When the first contact a is energized, a corresponding action is performed to rotate the T-type pipe in the T-type electric ball valve as shown in the figure. Figure 4 In the first state shown in (a), the filter 2042 is connected to the inlet of the medium and is not connected to the atmosphere. When the second contact b is energized, a corresponding action is performed to rotate the T-shaped pipe in the T-shaped electric ball valve as shown in FIG. Figure 4 In the second state shown in (b), the first end of the filter 2042 is connected to the atmosphere, and the filter 2042 is not connected to the inlet of the medium.

[0069] In some embodiments, a first end of the one-way valve 2043 is connected to the outlet of the filter 2042, and a second end is connected to the outlet of the medium, so that the medium can only flow from one side of the filter 2042 to the outlet of the medium, but cannot flow from one side of the outlet of the medium to the filter 2042. In this way, the medium at the outlet of the medium can be prevented from flowing back and damaging the air conditioning system, or from flowing back through the filter into the atmosphere and wasting resources.

[0070] In some embodiments, the second passage includes a first control valve 2044 . When the second passage is enabled, the medium flows from the medium inlet, through the first control valve 2044 , and out from the medium outlet.

[0071] In some embodiments, the first control valve 2044 is used to control whether a medium (eg, refrigerant, water, etc.) can pass through the second passage.

[0072] In some embodiments, the control device includes a pressure difference control unit 2045 and a pressure control unit 2046 .

[0073] In some embodiments, as Figure 5 As shown, the pressure difference control unit 2045 is connected in parallel with the filter 2042 to detect the pressure difference across the filter 2042 .

[0074] In some embodiments, the pressure difference control unit 2045 includes: a pressure difference switch 20451 , a second control valve 20452 , and a third control valve 20453 .

[0075] In some embodiments, the differential pressure switch 20451 has a normally closed point c and a normally open point d, and is used to detect the pressure differential across the filter 2042. When the pressure differential detected by the differential pressure switch is less than or equal to a preset threshold, the normally closed point of the differential pressure switch is closed and the normally open point of the differential pressure switch is opened; when the pressure differential detected by the differential pressure switch is greater than the preset threshold, the normally closed point of the differential pressure switch is opened and the normally open point of the differential pressure switch is closed.

[0076] In some embodiments, the normally closed point c is electrically connected to the first contact a of the electric ball valve, and the normally open point d is electrically connected to the second contact b of the electric ball valve. Thus, when the normally closed point c of the differential pressure switch 20451 is closed, the first contact a of the electric ball valve is energized to connect the filter 2042 to the medium inlet; when the normally open point d of the differential pressure switch 20451 is closed, the second contact b of the electric ball valve is energized to connect the first end of the filter 2042 to the atmosphere.

[0077] In some embodiments, the second control valve 20452 is disposed at a first end between the pressure differential switch 20451 and the filter 2042, and the third control valve 20453 is disposed at a second end between the pressure differential switch 20451 and the filter 2042. The second control valve 20452 and the third control valve 20453 are electrically connected to the normally closed point c of the pressure differential switch. When the normally closed point c of the pressure differential switch 20451 is closed, the second control valve 20452 and the third control valve 20453 are opened. When the normally closed point c of the pressure differential switch 20451 is open, the second control valve 20452 and the third control valve 20453 are closed.

[0078] In some embodiments, continuing as Figure 5 As shown, the pressure control unit 2046 includes a pressure switch 20461 and a fourth control valve 20462.

[0079] In some embodiments, the pressure switch 20461 has a normally closed point e and a normally open point f, and is used to detect the pressure value between the electric ball valve 2041 and the filter 2042. When the pressure value is within a preset pressure range, the normally closed point e of the pressure switch is closed and the normally open point f of the pressure switch is open; when the pressure value is outside the preset pressure range, the normally closed point e of the pressure switch is open and the normally open point f of the pressure switch is closed.

[0080] Exemplarily, the pressure preset range is a pressure value greater than 0. When the pressure value is greater than 0, the normally closed point e of the pressure switch is closed and the normally open point f of the pressure switch is disconnected; when the pressure value is equal to 0, the normally closed point e of the pressure switch is disconnected and the normally open point f of the pressure switch is closed.

[0081] In some embodiments, the pressure switch 20461 is electrically connected with the normally open point d of the differential pressure switch 20451, and when the normally open point d of the differential pressure switch 20451 is closed, the pressure switch 20461 detects the pressure value between the electric ball valve 2041 and the filter 2042. The normally closed point e of the differential pressure switch 20451 is electrically connected with the first control valve 2044, and when the normally closed point e is closed, the first control valve 2044 is opened.

[0082] In some embodiments, the fourth control valve 20462 is arranged between the second control valve 20452 and the third control valve 20453, and is electrically connected with the normally open point f of the pressure switch 20461, and when the normally open point f is closed, the fourth control valve 20462 is opened. At this time, since the fourth control valve 20462 is opened, the pressure difference between the second control valve 20452 and the third control valve 20453 is 0.

[0083] In some embodiments, the air conditioner filter system 204 can further include a time relay 2047 and a fifth control valve 2048.

[0084] In some embodiments, as shown in FIG. 4, the first end of the time relay 2047 is electrically connected with the normally open point d of the differential pressure switch 20451, and the second end is electrically connected with the fifth control valve 2048; when the normally open point d of the differential pressure switch 20451 is closed, the time relay 2047 is opened, and the time relay 2047 is used to control the fifth control valve 2048 to be opened after a preset time period. Figure 6

[0085] In some embodiments, the preset time period is greater than the action time period of the electric ball valve 2041, so that the fifth control valve 2048 can be controlled to be opened after the action of the electric ball valve 2041 is completed, preventing the port of the pipeline in the electric ball valve 2041 from reaching the specified position, causing medium leakage and other faults.

[0086] In some embodiments, the first end of the fifth control valve 2048 is connected with the electric ball valve 2041, and the second end is connected with the atmosphere, so that when the fifth control valve 2048 is opened, the first end of the filter 2042 can be connected with the atmosphere.

[0087] The following describes the enabling state of the passage in the air conditioner filter system under different working states in combination with the drawings of the specification.

[0088] Continuing as shown in FIG. 4, when the electric ball valve 2041 is closed, the first control valve 2044 is opened, and the second control valve 20452 and the third control valve 20453 are closed, so that the passage between the electric ball valve 2041 and the filter 2042 is closed, and the passage between the filter 2042 and the atmosphere is closed. Figure 6 ​As shown, during normal air conditioning operation, the air conditioning filtration system activates the first path. Medium enters the medium inlet, passes through electric ball valve 2041, and flows into filter 2042. After being filtered in filter 2042, it flows through check valve 2043 to the medium outlet. At this point, because the medium in the first path does not meet the cleaning standard, the pressure differential across filter 2042 detected by differential pressure switch 20451 is less than or equal to the preset threshold. The normally closed point of differential pressure switch 20451 is closed, and the normally open point is open. Consequently, the second control valve 20452 and the third control valve 20453, which are electrically connected to the normally closed point of differential pressure switch 20451, open. The first contact of electric ball valve 2041, which is electrically connected to the normally closed point of differential pressure switch 20451, is energized, connecting filter 2042 to the medium inlet. The pressure switch 20461 and time relay 2047, which are electrically connected to the normally open point of differential pressure switch 20451, are de-energized. Furthermore, the first control valve 2044 electrically connected to the normally closed point of the pressure switch 20461 is closed, the second passage is in an inactive state, and the fifth control valve 2048 electrically connected to the time relay 2047 is in a closed state.

[0089] like Figure 7 As shown, when the filter of the air conditioning system becomes clogged with dirt, the pressure differential across filter 2042 detected by differential pressure switch 20451 exceeds a preset threshold, causing the normally closed point of differential pressure switch 20451 to open and the normally open point to close. Consequently, second control valve 20452 and third control valve 20453, electrically connected to the normally closed point of differential pressure switch 20451, close. Time relay 2047, electrically connected to the normally open point of differential pressure switch 20451, is energized and begins operating. After a preset time, it controls fifth control valve 2048 to open, allowing the first end of filter 2042 to communicate with the atmosphere. The pressure switch, electrically connected to the normally open point of differential pressure switch 20451, is energized and begins operating. At this point, due to the presence of medium and impurities in the first passage, the pressure differential detected by pressure switch 20461 is greater than zero, causing the normally closed point of differential pressure switch 20451 to close and the normally open point to open. Therefore, first control valve 2044, electrically connected to the normally open point of pressure switch 20461, opens, activating the second passage. Fourth control valve 20462, electrically connected to the normally closed point of pressure switch 20461, closes. Simultaneously, the second contact of electric ball valve 2041, electrically connected to the normally open point of differential pressure switch 20451, is energized, connecting the first end of filter 2042 to the atmosphere and closing the first passage. Because the pressure in filter 2042 is greater than atmospheric pressure, once the first end of filter 2042 is connected to the atmosphere, the medium in the pipeline between check valve 2043 and electric ball valve 2041 flushes impurities from filter 2042 into the atmosphere, completing the automatic cleaning of the first passage.

[0090] like Figure 8As shown, when the cleaning of the impurities and medium in the first passage of the air conditioning system is completed, the pressure value detected by the pressure switch 20461 is equal to 0, the normally closed point of the pressure switch 20461 is disconnected and the normally open point is closed. At this time, the first control valve 2044 connected to the normally closed point of the pressure switch 20461 is closed, and the second passage is disabled; the fourth control valve 20462 connected to the normally open point of the pressure switch 20461 is opened, so that the differential pressure detected by the differential pressure switch 20451 is less than or equal to the preset threshold value, the normally closed point of the differential pressure switch 20451 is re-closed, and the first contact of the electric ball valve 2041 connected to the normally closed point of the differential pressure switch 20451 is electrified to act; the pressure switch 20461 connected to the normally open point of the differential pressure switch 20451 loses power and stops working; the second control valve 20452 and the third control valve 20453 connected to the normally closed point of the differential pressure switch 20451 are opened, and the first passage is re-enabled, so that the air conditioning filter system returns to the working state as shown. Figure 6

[0091] The specific schemes of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the execution subject of the control method of the filter system provided below can be a controller of the air conditioning system or a control device in the air conditioning filter system.

[0092] As shown in the Figure 9 The embodiment of the present application provides a control method of an air conditioning filter system, which can include the following steps:

[0093] S101, controlling the electric ball valve and the first control valve according to the differential pressure detected by the differential pressure control unit.

[0094] In some embodiments, when the differential pressure is less than or equal to the preset threshold value, the electric ball valve is controlled to be in the first state, and the first control valve is controlled to be in the closed state; when the differential pressure is greater than the preset threshold value, the electric ball valve is controlled to switch to the second state, and the first control valve is controlled to switch to the open state.

[0095] Wherein, when the electric ball valve is in the first state, the electric ball valve communicates the first end of the filter with the inlet of the medium, and when the electric ball valve is in the second state, the electric ball valve communicates the first end of the filter with the atmosphere.

[0096] In some embodiments, the differential pressure control unit includes a differential pressure switch; the differential pressure switch has a normally closed point and a normally open point; the normally closed point of the differential pressure switch is electrically connected to the first contact of the electric ball valve, and the normally open point of the differential pressure switch is electrically connected to the second contact of the electric ball valve.

[0097] ​As a possible implementation, when the detected differential pressure of the differential pressure switch is less than or equal to the preset threshold, the normally closed point of the differential pressure switch is closed and the normally open point of the differential pressure switch is opened; when the normally closed point of the differential pressure switch is closed and the normally open point of the differential pressure switch is opened, the first contact of the electric ball valve is electrified to communicate the first end of the filter with the inlet of the medium.

[0098] As another possible implementation, when the detected differential pressure of the differential pressure switch is greater than the preset threshold, the normally closed point of the differential pressure switch is opened and the normally open point of the differential pressure switch is closed; the time relay electrically connected with the normally open point of the differential pressure switch is electrified to work, and after a preset time period, the fifth control valve is controlled to open, so that the second contact of the electric ball valve is electrified to communicate the first end of the filter with the atmosphere. Since the electrification of the second contact of the electric ball valve needs a certain time, the first end of the filter is smoothly communicated with the inlet of the medium or the atmosphere. To this end, by setting the time relay, the fifth control valve is controlled to open after the time relay is opened for a preset time period, so that the action of the electric ball valve is guaranteed to be completed.

[0099] As can be seen from the above embodiments, when the differential pressure of the filter is less than or equal to the preset threshold, it indicates that the impurities in the filter do not reach the cleaning standard, at this time, the first contact of the electric ball valve is electrified by the differential pressure switch to make the filter communicate with the inlet of the medium, so that the first passage is enabled; when the differential pressure of the filter is greater than the preset threshold, it indicates that the impurities in the filter reach the cleaning standard, the second contact of the electric ball valve is electrified by the differential pressure switch to make the first end of the filter communicate with the atmosphere, so that the impurities in the filter can be flushed into the atmosphere.

[0100] In some embodiments, the differential pressure control unit further comprises a second control valve and a third control valve.

[0101] The second control valve is arranged between the differential pressure switch and the first end of the filter, and the third control valve is arranged between the differential pressure switch and the second end of the filter; the normally closed point of the differential pressure switch is further electrically connected with the second control valve and the third control valve; when the normally closed point of the differential pressure switch is closed and the normally open point of the differential pressure switch is opened, the second control valve and the third control valve are opened so that the differential pressure detected by the differential pressure switch is the differential pressure of the filter; when the normally closed point of the differential pressure switch is opened and the normally open point of the differential pressure switch is closed, the second control valve and the third control valve are closed.

[0102] As can be known from the above embodiment, when the pressure difference between the two ends of the filter is less than or equal to the preset threshold value, the second control valve and the third control valve electrically connected with the normally closed point of the pressure difference switch are opened, so that the medium between the two ends of the filter can pass through the second control valve and the third control valve to reach the detection point of the pressure difference switch; when the pressure difference between the two ends of the filter is greater than the preset threshold value, the first channel needs to be disabled for cleaning the impurities in the first channel. Since the normally closed point of the pressure difference switch is disconnected, the second control valve and the third control valve electrically connected with the normally closed point of the pressure difference switch are closed, so that the pressure difference detected by the pressure difference switch is in a stable state, thereby preventing the pressure difference between the two ends of the filter from changing when the first channel is automatically cleaned, and thus causing certain safety hazards.

[0103] S102, when it is detected that the pressure difference is greater than the preset threshold value, triggering the pressure control unit to detect the pressure value between the electric ball valve and the filter.

[0104] As can be known from the above embodiment, when the pressure difference detected by the pressure difference control unit is less than or equal to the preset value, it indicates that the first channel does not reach the cleaning standard. At this time, the pressure value between the electric ball valve and the filter must be within the preset pressure range, so the pressure control unit does not need to detect the pressure value between the electric ball valve and the filter. Only when the pressure difference detected by the pressure difference control unit is greater than the preset value, the pressure control unit needs to detect the pressure value between the electric ball valve and the filter to determine whether the impurities in the first channel are cleaned.

[0105] S103, controlling the first control valve according to the pressure value detected by the pressure control unit.

[0106] In some embodiments, when it is detected that the pressure value is within the preset pressure range, the first control valve is controlled to be opened; and when it is detected that the pressure value is outside the preset pressure range, the first control valve is controlled to be closed.

[0107] In some embodiments, the pressure control unit includes a pressure switch, and the pressure switch is electrically connected with the normally open point of the pressure difference switch; and the pressure switch is specifically used for detecting the pressure value between the electric ball valve and the filter when the normally open point of the pressure difference switch is closed.

[0108] The pressure switch has a normally closed point and a normally open point; and the normally closed point of the pressure switch is electrically connected with the first control valve.

[0109] As a possible implementation, when the pressure value is within the preset pressure range, the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is disconnected, and the first control valve is opened.

[0110] As another possible implementation, when the pressure value is outside the preset pressure range, the normally closed point of the pressure switch is disconnected and the normally open point of the pressure switch is closed, and the first control valve is closed.

[0111] As can be known from the above embodiments, the pressure switch can control the closing and opening of the normally closed point and the normally open point through the detected pressure value, thereby controlling the opening or closing of the first control valve electrically connected with the normally closed point of the pressure switch, and further controlling the enabling or disabling of the second passage through the opening or closing of the first control valve.

[0112] In some embodiments, the pressure control unit further comprises a fourth control valve.

[0113] The fourth control valve is arranged between the second control valve and the third control valve, and the pressure difference switch is in parallel connection; when the fourth control valve is opened, the pressure difference detected by the pressure difference switch is less than or equal to a preset threshold; the normally open point of the pressure switch is electrically connected with the fourth control valve.

[0114] As a possible implementation, when the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is opened, the fourth control valve is closed.

[0115] As another possible implementation, when the normally closed point of the pressure switch is opened and the normally open point of the pressure switch is closed, the fourth control valve is opened.

[0116] As can be known from the above embodiments, since the fourth control valve is arranged between the second control valve and the third control valve, when the fourth control valve is opened, the pressure values between the second control valve and the third control valve are the same, the pressure difference detected by the pressure difference switch is less than or equal to a preset threshold, and the first passage is controlled to be opened. Therefore, when the pressure value detected by the pressure switch is within the preset range, the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is opened, so that the fourth control valve electrically connected with the normally open point of the pressure switch is closed; when the pressure value detected by the pressure switch is outside the preset range, the normally open point of the pressure switch is closed and the normally closed point of the pressure switch is opened, so that the fourth control valve is opened.

[0117] S104, when it is detected that the pressure value is outside the preset pressure range, triggering the pressure difference control unit to detect the pressure difference between the two ends of the filter.

[0118] As a possible implementation, when the pressure value is outside the preset pressure range, the normally closed point of the pressure switch is opened and the normally open point of the pressure switch is closed, the fourth control valve electrically connected with the normally open point of the pressure switch is opened, and the pressure difference detected by the pressure difference switch is the pressure difference between the second control valve and the third control valve.

[0119] From the above embodiment, to improve the working quality of the air conditioner filtering system, after the blockage in the first passage is cleaned, the second passage needs to be disabled and the first passage is started. For this, the pressure control unit can detect the pressure between the electric ball valve and the filter. When the detected pressure value is within the preset pressure range, it means that there is blockage in the first passage, at this time, the pressure control unit controls the first control valve to open, so that the medium flows out through the second passage; when the detected pressure value is outside the preset range, it means that the medium and impurities in the first passage have been cleaned, at this time, the pressure control unit controls the first control valve to close, so that the second passage is disabled.

[0120] Figure 9 The embodiments shown at least bring the following beneficial effects: the air conditioner filtering system in the embodiments of the application is provided with two passages, which can be enabled when the first passage is blocked, thereby ensuring the normal operation of the air conditioner filtering system. When the control device detects that the pressure difference between the two ends of the filter is less than or equal to the preset threshold, it means that the impurities in the first passage do not reach the cleaning standard. At this time, the first passage is enabled and the second passage is not enabled, the electric ball valve communicates the first end of the filter with the inlet of the medium, so that the medium flows to the outlet of the medium after being filtered by the filter. When the control device detects that the pressure difference between the two ends of the filter is greater than the preset threshold, it means that the impurities in the first passage reach the cleaning standard, at this time, the impurities in the first passage need to be cleaned to prevent damage to the air conditioning system. For this, the second passage is enabled, and the control device controls the first control valve to open, so that the medium flows from the inlet to the outlet through the second passage.

[0121] At the same time, the control device controls the electric ball valve to communicate the first end of the filter with the atmosphere. Since the air pressure in the first passage is higher than the atmospheric pressure, the impurities in the first passage will be discharged through the electric ball valve to complete the automatic cleaning of the first passage. The one-way valve communicates with the second end of the filter, which can prevent the medium from flowing back and prevent the medium in the second passage from flowing into the atmosphere. In this way, on the one hand, the second passage is enabled when the first passage is blocked, which can ensure the continuous operation of the air conditioning system and improve the working efficiency of the air conditioning system. On the other hand, when the second passage is enabled, the impurities in the first passage will be automatically discharged, without the need for the user to clean, providing convenience for the user.

[0122] It can be seen that the above mainly introduces the scheme provided by the embodiments of the present application from the method aspect. To implement the above functions, the embodiments of the present application provide corresponding hardware structures and / or software modules for implementing each function. Those skilled in the art should easily realize that, in combination with the modules and algorithm steps of the examples described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0123] The embodiments of the present application can divide the functional modules of the controller according to the above method examples. For example, each functional module can be divided according to each function, or two or more functions can be integrated in one processing module. The above integrated module can be implemented in the form of hardware or software functional module. Optionally, the division of the modules in the embodiments of the present application is illustrative, and is only a logical functional division. In actual implementation, there can be another division manner.

[0124] The embodiments of the present application also provide a hardware structure schematic diagram of a controller, as shown in Figure 10 The controller 40 further includes a processor 401, and optionally further includes a memory 402 and a communication interface 403 connected with the processor 401. The processor 401, the memory 402 and the communication interface 403 are connected through a bus 404.

[0125] The processor 401 can be a central processing unit (CPU), a general processor network processor (NP), a digital signal processing (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD) or any combination thereof. The processor 401 can also be any other device with processing function, such as a circuit, a device or a software module. The processor 401 can also include multiple CPUs, and the processor 401 can be a single-CPU processor or a multi-CPU processor. The processor herein can refer to one or more devices, circuits or processing cores for processing data (for example, computer program instructions).

[0126] The memory 402 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magneto-optical disk storage, a magnetic disk storage or other magnetic storage devices, or any other medium capable of storing instructions or data in the form of programs and accessible by a computer, and the embodiments of the present application do not make any limitation on this. The memory 402 can exist independently or be integrated with the processor 401. The memory 402 can contain computer program codes. The processor 401 is configured to execute the computer program codes stored in the memory 402, so as to implement the control method provided by the embodiments of the present application.

[0127] The communication interface 403 can be configured to communicate with other devices or communication networks (such as Ethernet, a radio access network (RAN), a wireless local area network (WLAN), etc.). The communication interface 403 can be a module, a circuit, a transceiver or any device capable of realizing communication.

[0128] The bus 404 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. The bus 404 can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, Figure 10 Only one thick line is used in the figure, but it does not mean that there is only one bus or only one type of bus.

[0129] The embodiments of the present application also provide a computer readable storage medium, including computer execution instructions, when running on a computer, causing the computer to execute any one of the control methods of the air conditioner filtering system provided by the above embodiments.

[0130] The embodiment of the present application further provides a computer program product comprising computer-executable instructions which, when executed on a computer, cause the computer to perform the control method of any of the air conditioning filter systems provided by the above-mentioned embodiments.

[0131] In the above-mentioned embodiments, the implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented by using a software program, the implementation can be achieved entirely or partially in the form of a computer program product. The computer program product comprises one or more computer-executable instructions. When the computer-executable instructions are loaded and executed on a computer, the entire or partial process or function according to the embodiments of the present application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable apparatus. The computer-executable instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer-executable instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center through a wired (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium accessible by a computer or a data storage device comprising one or more servers, data centers, etc. integrated with the medium. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state disk (SSD)), etc.

[0132] Although the present application is described herein in conjunction with various embodiments, other variations of the disclosed embodiments can be understood and implemented by those skilled in the art through viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "one" does not exclude a plurality. A single processor or other unit can implement several functions listed in the claims. Certain measures described in mutually different dependent claims can be combined, and the resulting combination can also be claimed.

[0133] Although the present application has been described in connection with certain specific features and embodiments thereof, it is to be understood that it is intended to cover all modifications and variations of this application which are within the scope of the appended claims and their equivalents. Accordingly, the description and drawings are to be regarded as illustrative in nature and not as restrictive.

[0134] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioning filtration system, characterized by, The utility model relates to a kind of filter control system, comprising: First passage, electric ball valve, filter and check valve are sequentially arranged on the first passage; When the electric ball valve is in the first state, the electric ball valve communicates the first end of the filter with the inlet of medium, and when the electric ball valve is in the second state, the electric ball valve communicates the first end of the filter with atmosphere;The second end of the filter is communicated with the outlet of medium through the check valve;The filter is used to filter the medium;The check valve is used to prevent the medium from flowing backward; Second passage, the first end of the second passage is communicated with the inlet, and the second end of the second passage is communicated with the outlet;A first control valve is arranged on the second passage, and the first control valve is used to open or close the second passage; The control device comprises: A differential pressure control unit is used to detect the differential pressure across the filter;When it is detected that the differential pressure is less than or equal to a preset threshold, the electric ball valve is controlled to be in the first state;When it is detected that the differential pressure is greater than the preset threshold, the electric ball valve is controlled to switch to the second state, and the first control valve is controlled to switch to the open state; A pressure control unit is used to detect the pressure value between the electric ball valve and the filter;When it is detected that the pressure value is within a preset pressure range, the first control valve is controlled to be in the open state;When it is detected that the pressure value is outside the preset pressure range, the first control valve is controlled to switch to the closed state; The differential pressure control unit is also used to trigger the pressure control unit to detect the pressure value between the electric ball valve and the filter when it is detected that the differential pressure is greater than the preset threshold; The pressure control unit is also used to trigger the differential pressure control unit to detect the differential pressure across the filter when it is detected that the pressure value is outside the preset pressure range.

2. The air conditioner filtration system of claim 1, wherein, The differential pressure control unit comprises a differential pressure switch;The differential pressure switch has a normally closed point and a normally open point;The normally closed point of the differential pressure switch is electrically connected with a first contact point of the electric ball valve, and the normally open point of the differential pressure switch is electrically connected with a second contact point of the electric ball valve; When the detected differential pressure of the differential pressure switch is less than or equal to the preset threshold, the normally closed point of the differential pressure switch is closed, the normally open point of the differential pressure switch is opened, and the first contact point of the electric ball valve is electrified, and after the first contact point of the electric ball valve is electrified, the electric ball valve switches to the first state; When the detected differential pressure of the differential pressure switch is greater than the preset threshold, the normally closed point of the differential pressure switch is opened, the normally open point of the differential pressure switch is closed, and the second contact point of the electric ball valve is electrified, and after the second contact point of the electric ball valve is electrified, the electric ball valve switches to the second state.

3. The air conditioner filtration system of claim 2, wherein, The differential pressure control unit further comprises a second control valve and a third control valve: The second control valve is arranged between the first end of the differential pressure switch and the first end of the filter, and the third control valve is arranged between the second end of the differential pressure switch and the second end of the filter. The normally closed point of the differential pressure switch is also electrically connected with the second control valve and the third control valve; When the normally closed point of the differential pressure switch is closed and the normally open point of the differential pressure switch is opened, the second control valve and the third control valve are opened so that the differential pressure detected by the differential pressure switch is the differential pressure between the two ends of the filter; When the normally closed point of the differential pressure switch is opened and the normally open point of the differential pressure switch is closed, the second control valve and the third control valve are closed.

4. The air conditioner filtration system of claim 3, wherein, The pressure control unit comprises a pressure switch for detecting the pressure value between the electric ball valve and the filter; The pressure switch has a normally closed point and a normally open point; the normally closed point of the pressure switch is electrically connected with the first control valve; When the pressure value is within the preset pressure range, the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is opened, and the first control valve is opened; When the pressure value is outside the preset pressure range, the normally closed point of the pressure switch is opened and the normally open point of the pressure switch is closed, and the first control valve is closed.

5. The air conditioner filtration system of claim 4, wherein, The pressure switch is electrically connected with the normally open point of the differential pressure switch; the pressure switch is used to detect the pressure value between the electric ball valve and the filter when the normally open point of the differential pressure switch is closed.

6. The air conditioner filtration system of claim 4, wherein, The pressure control unit further comprises a fourth control valve; The first end of the fourth control valve is connected with the second control valve, and the second end of the fourth control valve is connected with the third control valve; when the fourth control valve is opened, the differential pressure detected by the differential pressure switch is less than or equal to the preset threshold value; The normally open point of the pressure switch is electrically connected with the fourth control valve; When the normally closed point of the pressure switch is closed and the normally open point of the pressure switch is opened, the fourth control valve is closed; When the normally closed point of the pressure switch is opened and the normally open point of the pressure switch is closed, the fourth control valve is opened.

7. The air conditioner filtration system of claim 3, wherein, The air conditioner filter system further comprises a fifth control valve, the first end of the fifth control valve is connected with the second interface of the electric ball valve, and the second end of the fifth control valve is connected with the atmosphere; A time relay, the first end of the time relay is electrically connected with the normally open point of the differential pressure switch, and the second end of the time relay is electrically connected with the fifth control valve; when the normally open point of the differential pressure switch is closed, the time relay is opened; the time relay is used to control the fifth control valve to be opened after being opened for a preset time length.

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