CN114504857B - Filter, air conditioner and impurity filtering backflow preventing method of air conditioner - Google Patents

Abstract

The invention discloses a filter, an air conditioner and an impurity filtering and anti-backflow method for the air conditioner. The filter comprises a filter body, a filter cavity is formed inside the filter body; an anti-backflow filter is arranged in the filter cavity and protrudes toward the filter element side, a flow medium flow port facing the filter element is arranged on the anti-backflow filter, a first impurity accommodating portion is formed between the outer wall of the anti-backflow filter and the inner wall of the filter cavity; the filter element is arranged in the filter cavity and protrudes toward the anti-backflow filter, a second impurity accommodating portion is formed between the outer wall of the filter element and the inner wall of the filter cavity, and the second impurity accommodating portion is opposite to the first impurity accommodating portion. The invention solves the problem of the prior art that the impurity backflow of the filter used in the air conditioner during heating operation affects the air conditioning performance.

Description

Filter, air conditioner and impurity filtering and backflow prevention method for air conditioner

Technical Field

The invention belongs to the field of air conditioning equipment, and in particular relates to a filter used in an air conditioner, an air conditioner with the filter, and an impurity filtering and backflow prevention method used in the air conditioner.

Background technique

At present, after the air conditioner is produced, it is directly turned on for test operation. During the production and installation process, certain impurities will be generated, such as copper filings, dust, iron filings inside the compressor and other impurities. These impurities will affect the performance of the air conditioner and also affect the life of the compressor.

The existing structural method is to add a filter behind the capillary tube coming out of the condenser of the air conditioner, and a filter net is also correspondingly arranged inside the compressor storage tank. For heat pump type air conditioners, since the flow directions of the flowing media of the cooling and heating air conditioners are inconsistent, filters are required before and after the capillary tube, that is, 2 filters are arranged before and after the capillary tube/throttling short tube/electronic expansion valve, and a filtering structure is also arranged inside the compressor storage tank. The filter structure is an internal single-layer filter net. By arranging a plurality of filter combinations, not only the cost of the entire air conditioner is increased, but also when the heating operation is performed, the flowing medium flows in the reverse direction, and the impurities filtered by the filter and the filter net will also flow back under the impact of the reverse flow of the flowing medium, so that the impurities eventually enter the air conditioning system again, affecting the performance of the air conditioner.

Summary of the invention

The present invention aims to solve the problem in the prior art that the backflow of impurities from the filter used in the air conditioner during heating operation affects the air conditioning performance. The present invention proposes a novel filter structure. The filter of this structure is internally provided with a backflow prevention filter and a filter element that cooperate with each other. When in use, the two cooperate with each other and can play an anti-backflow role through the backflow prevention filter, ensuring that even during heating operation, there will be no problem of impurities backflowing into the air conditioning system, thereby improving the performance of the entire air conditioner.

In order to achieve the above-mentioned invention object, the present invention adopts the following technical solutions:

A filter, a filter body, a filter cavity formed inside the filter body;

Also included are a backflow prevention filter and a filter element;

The anti-backflow filter is arranged in the filter cavity and protrudes toward the filter element. A flow medium flow port facing the filter element is arranged on the anti-backflow filter, and a first impurity receiving portion is formed between the outer wall of the anti-backflow filter and the inner wall of the filter cavity.

A filter element is disposed in the filter cavity and protrudes toward the backflow prevention filter element. A second impurity receiving portion is formed between an outer wall of the filter element and an inner wall of the filter cavity. The second impurity receiving portion is opposite to the first impurity receiving portion.

Wherein, when the flow medium flows through the filter element from the flow medium flow port of the backflow prevention filter element, impurities in the flow medium can be stored in the second impurity receiving portion;

When the flow medium flows from the filter element through the backflow prevention filter, the foreign matter stored in the second foreign matter receiving portion can be retained in the first foreign matter receiving portion.

In some embodiments of the present application, the anti-backflow filter element includes a backflow guide connected to the periphery of the flow medium flow port, the backflow guide includes a backflow guide surface located on the outside, the first impurity accommodating portion is formed between the backflow guide surface and the inner wall of the filter cavity, and the distance between the backflow guide surface and the inner wall of the filter cavity gradually decreases from the direction close to the filter element to the direction away from the filter element.

In some embodiments of the present application, the backflow guide surface is an inclined surface or a curved surface with a smooth transition.

In some embodiments of the present application, the filter element includes a central filter portion arranged opposite to the flow medium flow port and a peripheral filter portion located around the central filter portion, the peripheral filter portion includes a filter guide surface located on the outside, and the second impurity receiving portion is formed between the filter guide surface and the inner wall of the filter cavity, and the distance between the filter guide surface and the inner wall of the filter cavity gradually decreases from the direction close to the anti-backflow filter element to the direction away from the anti-backflow filter element.

In some embodiments of the present application, the filtering guide surface is an inclined surface or a smoothly transitioned curved surface.

In some embodiments of the present application, the distance between the central filter portion and the flow medium flow opening is 1/3-1/2 of the diameter of the filter body.

In some embodiments of the present application, the diameter of the flow medium flow port is 1/3-1/2 of the diameter of the filter body.

An air conditioner, comprising:

Compressor, condenser, evaporator, four-way reversing valve, compressor liquid storage tank and gas-liquid pipe components,

Among them, the gas-liquid pipe assembly connects the compressor, condenser, evaporator, four-way reversing valve and compressor liquid storage tank to form a refrigerant circulation loop, and also includes the filter described in the above technical solution. The filter is arranged on the refrigerant pipeline between the condenser and the evaporator, and the anti-backflow filter and the filter element are arranged in sequence above and below in the compressor liquid storage tank.

A method for filtering impurities and preventing backflow in an air conditioner according to the above technical solution comprises the following steps:

The air conditioner is controlled to start and run in cooling mode, the indoor fan is controlled to run at high wind speed, the compressor is controlled to run at a set first preset frequency, and the running time of the indoor fan and compressor is controlled to be at least greater than the first preset time.

In some embodiments of the present application, the air conditioner also includes a controller, which can control the air conditioner to operate in cooling mode when it detects that the air conditioner is operating in heating mode and the operating time is greater than a second preset time, and control the indoor fan to operate in low wind or silent mode, the compressor to operate at a set second preset frequency, and control the indoor fan and compressor to operate for a second preset time.

Compared with the prior art, the advantages and positive effects of the present invention are:

The filter proposed by the present invention is provided with a filter element and an anti-backflow filter element that cooperate with each other, and a second impurity accommodating portion is formed between the filter element and the filter body, and a first impurity accommodating portion is formed between the anti-backflow filter element and the filter body. When the flowing medium flows through the filter element from the flowing medium flow port of the anti-backflow filter element, the impurities in the flowing medium can be stored in the second impurity accommodating portion;

When the flowing medium flows from the filter element through the anti-backflow filter, since the first impurity containing portion and the second impurity containing portion are relatively arranged, the impurities stored in the second impurity containing portion can be blocked in the first impurity containing portion. When in use, the impurities can be filtered and blocked in the second impurity containing portion to achieve impurity blocking. When the flowing medium flows in the reverse direction, the impurities can be blocked in the first impurity containing portion of the anti-backflow filter and the filter body, so that they will not flow back into the entire flow path, thereby achieving the anti-backflow effect.

After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become more clear.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the three-dimensional structure of a filter in Embodiment 1 of the present invention;

FIG2 is a schematic diagram of a half-section structure of the interior of a filter in Embodiment 1 of the present invention;

FIG3 is a front view of the filter in Embodiment 1 of the present invention;

FIG4 is a schematic diagram of the internal structure of the filter in Embodiment 1 of the present invention;

FIG5 is a system schematic diagram of an air conditioner in Embodiment 2 of the present invention.

Among them, filter body-100; filter cavity-110; first flow medium flow port-120;

Second flow medium flow port-130; guide member-140;

Anti-backflow filter element-200; flow medium flow opening-210; backflow guide element-220; backflow guide surface-221;

Filter element-300; central filter portion-310; peripheral filter portion-320; filter guide surface-321;

First impurity receiving part -400;

Second impurity receiving part-500;

Compressor-610; condenser-620; evaporator-630; four-way reversing valve-640; compressor liquid storage tank-650;

Throttling device - 660.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

The present invention provides an embodiment of a filter, comprising:

A filter body 100, wherein a filter cavity 110 is formed inside the filter body 100;

In some embodiments of the present application, the cross-section of the filter body 100 is circular. Of course, the cross-section of the filter body 100 may also be other shapes such as an ellipse, which is not specifically limited here.

The filter body 100 is provided with a first fluid medium flow port 120 and a second fluid medium flow port 130 at both ends.

The first flowing medium flow port 120 and the second flowing medium flow port 130 are both in communication with the filter body 100 , so that the flowing medium can flow into or out of the filter body 100 .

In order to achieve a guiding effect on the flow of the flowing medium, in some embodiments of the present application, a guide member 140 is provided between the first flowing medium flow port 120 and the filter body 100, and between the second flowing medium flow port 130 and the filter body 100. There are two guide members 140, which respectively connect the first flowing medium flow port 120 and the filter body 100, and the second flowing medium flow port 130 and the filter body 100.

A guide cavity is formed inside the guide member 140, and the guide cavity is conical, and its inner diameter gradually increases from the direction close to the first flow medium flow port 120 or the second flow medium flow port 130 to the direction away from the first flow medium flow port or the second flow medium flow port, so as to guide the flow medium transition to the interior of the filter body 100.

The backflow prevention filter 200 is disposed in the filter cavity 110 and protrudes toward the filter element 300. A flow medium flow port 210 is disposed at the bottom of the backflow prevention filter 200. A first impurity receiving portion 400 is formed between the outer wall of the backflow prevention filter 200 and the inner wall of the filter cavity 110.

In some embodiments of the present application, the anti-backflow filter 200 is a filter net with a flow medium flow port 210 at the bottom, and when connected to the air conditioner, it is close to the condenser 620 side.

In other embodiments of the present application, the anti-backflow filter element 200 is annular, and after being arranged inside the filter body 100, an annular first impurity receiving portion 400 is formed between the filter body 100, and the first impurity receiving portion 400 is a first impurity receiving groove, and the first impurity receiving portion 400 can be used to accommodate impurities in the flow of the flowing medium.

The filter element 300 is arranged in the filter cavity 110, protruding toward the anti-backflow filter element 200 side, and is arranged opposite to the flow medium flow port 210 of the anti-backflow filter element 200. A second impurity receiving portion 500 is formed between the outer wall of the filter element 300 and the inner wall of the filter cavity 110, and the second impurity receiving portion 500 and the first impurity receiving portion 400 are positioned opposite to each other.

The filter element 300 is a filter net. Since it is arranged opposite to the flow medium flow port 210, it can be used to filter impurities flowing out of the flow medium flow port 210 of the anti-backflow filter 200, and since it is arranged to protrude toward the side of the anti-backflow filter 200, the impurities on its surface after being filtered by the filter element 300 can fall into the second impurity receiving portion 500 and be stored.

When the filter in this embodiment is used for filtering in a flow path, it can be connected to the flow path through the first flow medium flow port and the second flow medium flow port located at both ends thereof, respectively, to play a filtering role.

When the flow medium flows through the filter element 300 from the flow medium flow port of the backflow prevention filter element 200 , impurities in the flow medium can be stored in the second impurity receiving portion 500 ;

When the flowing medium flows from the filter element 300 through the backflow prevention filter 200 , since the first impurity receiving portion 400 and the second impurity receiving portion 500 are arranged relative to each other, the impurities stored in the second impurity receiving portion 500 can be blocked in the first impurity receiving portion 400 .

When the flowing medium flows, it can enter from the anti-backflow filter 200 in the reverse direction of the first flow, flow into the flowing medium and impurities from the anti-backflow filter 200 through the flowing medium flow port 210, flow into the filter element 300, flow through the surface of the filter element 300, and be filtered by the filter element 300. The impurities filtered by the filter element 300 are blocked on the filter element 300, and the flowing medium can continue to flow forward through the filter holes on the filter element 300. Since the filter element 300 protrudes toward the side of the anti-backflow filter 200, the impurities blocked on the filter element 300 can fall along the outer wall of the filter element 300 into the second impurity receiving portion 500 between the outer wall of the filter element 300 and the inside of the filter cavity 110, thereby achieving a better filtering effect.

When the flowing medium flows in the reverse direction, the flowing medium will flow out from the filter element 300, and then flow out through the flowing medium flow port 210. At this time, under the impact of the flowing medium, the impurities blocked in the second impurity receiving portion 500 will be impacted and flow. Since the anti-backflow filter element 200 in this embodiment is correspondingly arranged to protrude toward the filter element 300 and is formed with a first impurity receiving portion 400 which is opposite to the second impurity receiving portion 500, the impurities can be impacted into the first impurity receiving portion 400, so that the impurities will not enter the flow circuit, thereby achieving the anti-backflow effect.

In some embodiments of the present application, the backflow prevention filter element 200 may be clamped at the connection position between the guide element and the filter body 100 when being fixed.

In some embodiments of the present application, the backflow prevention filter element 200 includes a backflow guide 220 connected to the periphery of the flow medium flow port 210, the backflow guide 220 includes a backflow guide surface 221 located on the outside, and the first impurity receiving portion 400 is formed between the backflow guide surface 221 and the inner wall of the filter chamber 110, and the distance between the backflow guide surface 221 and the inner wall of the filter chamber 110 gradually decreases from the direction close to the filter element 300 to the direction away from the filter element 300.

The flow medium flow opening 210 is a circular opening, and the backflow guide 220 is arranged in the circumferential direction of the flow medium flow opening 210 to form the square backflow filter together with the flow medium flow opening 210 .

The backflow guide 220 is a mesh structure.

Since the distance between the reflux guide surface 221 and the inner wall of the filter chamber 110 is gradual, the impurity accommodating space of the first impurity accommodating portion 400 formed therebetween is also gradual, that is, it continuously decreases from the direction close to the filter element 300 to the direction away from the filter element 300, forming an inverted conical cylinder structure.

In some embodiments of the present application, the backflow guide surface 221 is an inclined surface or a curved surface with a smooth transition.

The reflux guide surface 221 is mainly used to play a blocking and guiding role, blocking the impurities impacting the second impurity containing section 500 to prevent them from flowing back, and at the same time quickly guiding the impurities stored in the second impurity containing section 500 to the first impurity containing section 400 formed between the second impurity containing section 500 and the filter chamber 110 when the refrigerant flows in the reverse direction.

In some preferred embodiments, the backflow guide surface 221 is an inclined surface, and the backflow prevention filter element 200 is correspondingly an inverted cone-shaped filter element having a flow medium flow opening 210 at the bottom.

The angle between the backflow guide surface 221 of the inverted cone filter element and the inner wall of the filter body 100 is 50-60 degrees, which can block the backflow of impurities with the maximum area.

The diameter of the flow medium flow opening 210 of the middle opening of the inverted cone filter element is 8 mm, which is slightly smaller than half of the diameter of the filter body 100, and the diameter of the filter body 100 is 18 mm.

During setting, the height difference between the bottom of the inverted cone filter and the top of the filter element 300 is 4 mm, which is half of the flow medium flow port 210 of the inverted cone filter net, which can ensure that impurities, metal chips, etc. within 4 mm pass through the inverted cone filter and gather at the bottom of the filter element 300.

In some embodiments of the present application, the backflow guide surface 221 is a smooth transition curved surface, such as an arc-shaped surface, and the backflow prevention filter element 200 is a semi-arc-shaped element having a flow medium flow opening 210 at the bottom.

In some embodiments of the present application, the filter element 300 includes a central filter portion 310 arranged opposite to the flow medium flow port 210 and a peripheral filter portion 320 located around the central filter portion 310, the peripheral filter portion 320 includes a filter guide surface 321 located on the outside, and the second impurity receiving portion 500 is formed between the filter guide surface 321 and the inner wall of the filter chamber 110, and the distance between the filter guide surface 321 and the inner wall of the filter chamber 110 gradually decreases from the direction close to the anti-backflow filter element 200 to the direction away from the anti-backflow filter element 200.

The central filter portion 310 is a central filter area, which is composed of a top net, and the peripheral filter portion 320 is surrounded by a peripheral filter net. During molding, the central filter portion 310 and the peripheral filter portion 320 are integrally formed and smoothly transitionally connected.

In some embodiments of the present application, the filtering guide surface 321 is an inclined surface or a smoothly transitioned curved surface.

The filtering guide surface 321 can play a filtering and guiding role.

Since the filter element 300 as a whole protrudes toward the anti-backflow filter element 200 side and is opposite to the flow medium flow port 210, when the flow medium and impurities pass through the filter element 300, they will first flow and impact the central filter portion 310 thereof, where the impurities are filtered and separated at the central filter portion 310 of the filter element 300. After accumulation, they are guided by the filter guide surface 321 located around them and introduced into the bottom position of the second impurity holding portion 500 to be stored.

In some preferred embodiments of the present application, the filtering guide surface 321 is a filtering arc surface, which is smoothly transitioned to the top center filtering portion 310 to form a semi-arc filter screen.

In some embodiments of the present application, the distance between the central filter portion 310 and the flow medium flow port is 1/3-1/2 of the diameter of the filter body 100, that is, a suitable height difference should be maintained between the backflow prevention filter element 200 and the filter element 300.

If the height difference between the two is too small, it cannot be ensured that the flow medium and impurities flowing out of the flow medium connecting port can fully flow through the filter element 300 to be completely filtered, resulting in a poor filtering effect.

If the height difference between the two is too large, when the flowing medium flows from the filter element 300 through the anti-backflow filter 200, the impurities stored in the second impurity receiving portion 500 will be flushed out due to the long distance, and some of them will flow back through the flow channel medium flow port.

Therefore, in this embodiment, the distance between the central filter portion 310 and the flow medium connecting port is reasonably limited to ensure that the backflow prevention filter element 200 and the filter element 300 are maintained within an appropriate height difference, thereby ensuring the filtering effect and effectively avoiding the backflow problem.

In some embodiments of the present application, the diameter of the flow medium flow port 210 is 1/3-1/2 of the diameter of the filter body 100 .

In order to meet the needs of filtering impurities in other different fluid pipelines, the diameter of the filter can also be increased during setting to meet the usage requirements. At the same time, according to the relevant dimensional correlation, the diameter of the flow medium connecting port of the inverted cone filter element and the height difference gap between the backflow prevention filter element 200 and the filter element 300 need to be increased to achieve a good filtering effect. No specific restrictions are made here.

Example

This embodiment provides an embodiment of an air conditioner, including:

Compressor 610, condenser 620, evaporator 630, four-way reversing valve 640, compressor liquid storage tank 650 and gas-liquid pipe assembly,

Among them, the gas-liquid pipe assembly connects the compressor 610, condenser 620, evaporator 630, four-way reversing valve and compressor liquid storage tank 650 to form a refrigerant circulation loop, and also includes the filter described in Example 1, which is arranged on the refrigerant pipeline between the condenser 620 and the evaporator 630, and the anti-backflow filter 200 and the filter element 300 are arranged in sequence in the upper and lower parts of the compressor 610 liquid storage tank.

During refrigeration operation, the refrigerant in this embodiment goes out through the exhaust pipe of the compressor 610 and enters the condenser 620. After coming out of the condenser 620, it passes through the filter and then passes through the throttling device 660, such as a capillary tube or a throttling short tube or an electronic expansion valve, and then enters the indoor unit evaporator 630. After going out of the evaporator 630, it enters the return air pipe, and the return air pipe enters the compressor liquid storage tank 650. After passing through the anti-backflow filter 200 and the filter element 300 in the compressor liquid storage tank 650, it enters the interior of the compressor 610. After being compressed, the refrigerant goes out from the exhaust pipe again, completing a cycle.

During the operation of this refrigeration cycle, impurities inside the compressor 610, the exhaust pipe, the condenser 620 intake pipe, the condenser 620, etc. are blocked and filtered by the filter arranged between the condenser 620 and the throttling device 660. As the refrigerant circulates further, impurities inside the throttling device 660, the evaporator 630, the return air pipe, etc. between the evaporator 630 and the compressor 610 are blocked and filtered by the filter element 300 inside the compressor storage tank 650. After a period of refrigeration operation, all impurities of the air conditioner are evenly stored and blocked inside the filter element 300 in the filter and the compressor storage tank 650, so that almost all impurities in the entire air-conditioning system are filtered and blocked, ensuring the stable operation of the system, improving the efficiency of the air conditioner, and increasing the life of the compressor 610.

Through the structure of the air conditioner in this embodiment, the impurities in the entire system can be collected inside the filter and the compressor liquid storage tank 650 after a period of cooling operation, thereby realizing the collection of impurities.

When the air conditioner is running in heating mode, the refrigerant will flow in the reverse direction, flowing out from the compressor 610 through the compressor storage tank 650, then passing through the four-way reversing valve 640, entering the evaporator 630, and then passing through the throttling device 660, through the filter and condenser 620, and then flowing back to the compressor 610.

Since the anti-backflow filter 200 is added to the front end of the filter element 300 of the filter and the compressor liquid storage tank 650 in this embodiment, it can effectively block impurities and prevent impurities from flowing back into the refrigerant system. In this way, even when the user changes the air conditioner to heating mode and the refrigerant flows in the opposite direction, the impurities will be blocked by the anti-backflow filter 200 and cannot flow in the opposite direction, which effectively prevents the impurities from flowing back into the air-conditioning system. At the same time, the anti-backflow filter 200 is also in a mesh state and does not affect the reverse flow of the refrigerant.

Furthermore, since the filter and the compressor storage tank 650 in this embodiment are both provided with an anti-backflow filter element 200, impurities in the entire refrigerant system are collected, thereby ensuring that when the refrigerant flows in the opposite direction, the impurities will not flow back into the refrigerant circulation loop, and new impurities will not be generated between the evaporator 630 and the refrigerant pipe between the compressor 610 and the throttling device 660. In this way, when setting up, the filter structure arranged between the throttling device 660 and the evaporator 630 can be omitted, so that the entire air-conditioning system only needs one filter, thereby reducing the production cost of the entire air conditioner.

This embodiment also provides a method for filtering impurities and preventing backflow for the air conditioner, comprising the following steps:

The air conditioner is controlled to start and run in cooling mode, the indoor fan is controlled to run at high wind speed, the compressor 610 runs at a set first preset frequency, and the running time of the indoor fan and compressor 610 is controlled to be at least greater than the first preset time.

In some embodiments of the present application, the air conditioner also includes a controller, which can control the air conditioner to operate in cooling mode when it detects that the air conditioner is operating in heating mode and the operating time is greater than a second preset time, and control the indoor fan to operate in low wind or silent mode, the compressor 610 to operate at a set second preset frequency, and control the indoor fan and compressor 610 to operate for a second preset time.

Specifically: For fixed-frequency air conditioners, whether fixed-frequency cooling or fixed-frequency heat pump air conditioners, since the compressor 610 frequency of the air conditioner is fixed, after the production of the air conditioner outdoor unit is completed, the outdoor unit needs to be tested online before it is packaged offline. The impurity filtering and backflow prevention method of the air conditioner includes the following steps:

During the online test: the air conditioner is controlled to run according to: cooling, indoor fan high wind, compressor 610 preset first preset frequency, and the first preset time is set to more than 3 minutes to collect impurities from the outdoor unit. After the air conditioner is sold to the user's home and the installer installs the air conditioner and completes the online connection, it is turned on for a trial run, and the air conditioner is controlled to run according to: cooling, indoor fan high wind, compressor 610 first preset frequency for more than 3 minutes to collect impurities between the indoor unit and the online pipe. From then on, the impurities of the air conditioner are collected.

The filter device of the air conditioner can prevent the backflow of impurities. The impurity filtering and anti-backflow method of the air conditioner also includes: when in use, the user can run the air conditioner according to his own settings, and set the operating mode of the air conditioner according to the operating time, so that after a preset time, the cooling operation is turned on, and the indoor unit is set to high wind, and the compressor 610 is operated at a first preset frequency to prevent wear and tear inside the air conditioner during long-term operation. For example, after recording that the user has used the air conditioner for more than 500 hours, the air conditioner is automatically set to run for 3 minutes according to: cooling, indoor high wind, and a fixed set frequency of the compressor 610 to complete a regular collection of impurities. Function.

If the user is operating the heating system in winter, the present invention follows the steps of: cooling, indoor fan silencing, compressor 610 running at a second preset frequency for a second preset time, which is at least greater than 3 minutes, to complete a periodic collection of impurities, and recalculate the duration after the periodic collection is completed.

The anti-backflow method of the present invention is aimed at variable frequency air conditioners, no matter it is a variable frequency single cooling or a variable frequency heat pump air conditioner. Since the frequency of the compressor 610 of the air conditioner is variable, after the production of the outdoor unit of the air conditioner is completed, it is required to be tested online before it is packaged offline. After starting up, it runs according to: refrigeration, indoor high wind, and the first preset frequency of the compressor 610, such as 50HZ, for more than 3 minutes to achieve the effect of collecting impurities from the outdoor unit. After the air conditioner is sold to the user's home and the air conditioner is installed and connected online by the installer, it is started for trial operation, according to: refrigeration, indoor fan high wind, and the first preset frequency set by the compressor 610 for more than 3 minutes to achieve the effect of collecting impurities between the indoor unit and the online pipe. From then on, the preliminary collection of impurities has been completed.

At the same time, according to the anti-backflow filter of the present invention, the backflow of impurities can be prevented. The user can run the air conditioner according to his own settings and set the running time to prevent wear and tear inside the air conditioner during long-term operation. After recording that the user has used the air conditioner for more than 500 hours, the air conditioner in this embodiment is automatically set to: refrigeration, high wind indoors, and the compressor 610 runs at a frequency of 50HZ for 3 minutes to complete a regular collection of impurities. If the user is heating in winter, this embodiment is set to: refrigeration, indoor quietness, and the compressor 610 runs at a second preset frequency of 50HZ for a second preset time, which is at least greater than 3 minutes, to complete a regular collection of impurities. The duration is recalculated after the regular collection is completed.

50HZ is a more reasonable frequency. Too high a frequency may cause over-temperature protection, while too low a frequency may cause insufficient refrigerant flow and incomplete impurity collection.

The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims (7)

1. An impurity filtering and backflow prevention method for an air conditioner, the air conditioner comprising: a compressor, a condenser, an evaporator, a four-way reversing valve, a compressor liquid storage tank and a gas-liquid pipe assembly, wherein the gas-liquid pipe assembly connects the compressor, the condenser, the evaporator, the four-way reversing valve and the compressor liquid storage tank to form a refrigerant circulation loop; A filter, the filter is arranged on the refrigerant pipeline between the condenser and the evaporator, and comprises: a filter body, a filter cavity is formed inside the filter body; An anti-backflow filter element is arranged in the filter cavity and protrudes toward the filter element. A flow medium flow port facing the filter element is arranged on the anti-backflow filter element, and a first impurity receiving portion is formed between the outer wall of the anti-backflow filter element and the inner wall of the filter cavity. A filter element is disposed in the filter cavity and protrudes toward the backflow prevention filter element. A second impurity receiving portion is formed between an outer wall of the filter element and an inner wall of the filter cavity. The second impurity receiving portion is opposite to the first impurity receiving portion. The anti-backflow filter and the filter element are sequentially arranged in the upper and lower parts of the compressor liquid storage tank; Wherein, when the flow medium flows through the filter element from the flow medium flow port of the backflow prevention filter element, impurities in the flow medium can be stored in the second impurity receiving portion; When the flowing medium flows from the filter element through the anti-backflow filter, the impurities stored in the second impurity receiving portion can be blocked in the first impurity receiving portion, and when the air conditioner is operated in the cooling mode, the flowing medium in the filter first flows through the anti-backflow filter and then flows through the filter element; The impurity filtering and backflow prevention method includes the following steps: Control the air conditioner to start and run in cooling mode, control the indoor fan to run at high wind speed, the compressor to run at a set first preset frequency, and control the running time of the indoor fan and the compressor to be at least greater than the first preset time; The air conditioner also includes a controller, which can control the air conditioner to operate in cooling mode when it is detected that the air conditioner is operating in heating mode and the operating time is greater than a second preset time, and control the indoor fan to operate in low wind or silent mode, the compressor to operate at a set second preset frequency, and control the indoor fan and compressor to operate for a second preset time. 2. The impurity filtering and backflow prevention method for an air conditioner according to claim 1 is characterized in that the backflow prevention filter element includes a backflow guide connected to the periphery of the flow medium flow port, the backflow guide includes a backflow guide surface located on the outside, the first impurity accommodating portion is formed between the backflow guide surface and the inner wall of the filter cavity, and the distance between the backflow guide surface and the inner wall of the filter cavity gradually decreases from the direction close to the filter element to the direction away from the filter element. 3. The impurity filtering and backflow prevention method for an air conditioner according to claim 2, characterized in that the backflow guide surface is an inclined surface or a smoothly transitioned curved surface. 4. The impurity filtering and backflow prevention method for an air conditioner according to claim 1 is characterized in that the filter element includes a central filter portion arranged opposite to the flow medium flow port and a peripheral filter portion located around the central filter portion, the peripheral filter portion includes a filter guide surface located on the outside, the second impurity accommodating portion is formed between the filter guide surface and the inner wall of the filter cavity, and the distance between the filter guide surface and the inner wall of the filter cavity gradually decreases from the direction close to the backflow prevention filter element to the direction away from the backflow prevention filter element. 5. The impurity filtering and backflow prevention method for an air conditioner according to claim 4, characterized in that the filtering guide surface is an inclined surface or a smoothly transitioned curved surface. 6. The impurity filtering and backflow prevention method for an air conditioner according to claim 4, characterized in that the distance between the central filter portion and the flow medium flow opening is 1/3-1/2 of the diameter of the filter body. 7. The impurity filtering and backflow prevention method for an air conditioner according to claim 1, characterized in that the diameter of the flow medium flow port is 1/3-1/2 of the diameter of the filter body.