CN116804475A - Air conditioner and compression type refrigerating system thereof - Google Patents

Abstract

The application provides an air conditioner and a compression refrigeration system thereof, wherein the compression refrigeration system comprises a capillary tube and a filter which are connected in series in a refrigerant circulation flow path and are connected through a connecting tube section, a first end of the connecting tube section is connected with one end of the capillary tube, a second end of the connecting tube section is connected with a connecting port of the filter, and the connecting tube section is further provided with: in the direction from the first end to the second end, the outer diameter of the second end of the connecting pipe section is adapted to the connecting port of the filter by enlarging the inner diameter at least once, and the turbulence intensity of the refrigerant flowing into the filter is reduced. The compression refrigeration system can reduce the turbulence intensity of the refrigerant flowing into the filter, and reduce the vibration and noise of the whole compression refrigeration system.

Description

Air conditioner and compression type refrigerating system thereof

Technical Field

The present application relates to compression refrigeration technology, and more particularly, to an air conditioner and a compression refrigeration system thereof.

Background

The compression refrigeration system generally comprises a compressor, a condenser, a filter, a throttling device and an evaporator which are connected through refrigerant management, wherein the compressor sucks low-pressure working medium steam from the evaporator, the low-pressure working medium steam is sent to the condenser after the pressure of the working medium steam is increased, the working medium steam is condensed into high-pressure liquid in the condenser, the throttling device can be a capillary tube, refrigerant discharged from the condenser is throttled by the capillary tube and then is sent to the evaporator after being low-pressure liquid, the refrigerant absorbs heat and is evaporated in the evaporator and is then sent to an inlet of the compressor, and therefore refrigeration cycle is completed. The filter can be arranged in front of the capillary tube to filter out impurities in the refrigerant and prevent the capillary tube from being blocked. Since the flow direction of the refrigerant can be switched in general, in order to filter impurities in the refrigerant entering the capillary tube in two directions, filters may be provided at both ends of the capillary tube, respectively, that is, one filter must be located after the capillary tube.

However, the inventor has realized that the inner diameter of the capillary tube is much smaller than that of the filter, the pressure of the refrigerant discharged into the filter after being throttled by the capillary tube is instantaneously released, the flow direction of the refrigerant is disturbed, and the flow of the refrigerant causes turbulent abnormal sound, so that improvement is needed.

Disclosure of Invention

It is an object of the present application to overcome at least one of the drawbacks of the prior art and to provide an air conditioner and a compression refrigeration system thereof.

It is a further object of the present application to reduce the turbulence intensity of the refrigerant flowing into the filter, and to reduce vibration and noise of the overall compression refrigeration system.

It is a further object of the application to determine the number of expansion and to ensure that the inner diameter of the connection opening of the filter can be adapted.

In particular, the application provides a compression refrigeration system comprising a capillary tube and a filter connected in series in a refrigerant circulation flow path and connected by a connecting tube section, wherein a first end of the connecting tube section is connected with one end of the capillary tube, a second end of the connecting tube section is connected with a connecting port of the filter, and the connecting tube section is further arranged to: in the direction from the first end to the second end, the outer diameter of the second end of the connecting pipe section is adapted to the connecting port of the filter by enlarging the inner diameter at least once, and the turbulence intensity of the refrigerant flowing into the filter is reduced.

Optionally, the number of expanding times N of the connecting tube section, the inner diameter D of the capillary tube and the inner diameter D of the connecting port of the filter satisfy: when 2 ^k ·d＜D≤2 ^(k+1) D, n=k+1, where k is a natural number.

Optionally, the connecting tube section is further arranged to connect the two tube sections before and after expanding by means of the flaring section.

Optionally, the ratio of the lengths of two adjacent pipe sections before and after expanding is between 1 and 2.

Optionally, in the connecting pipe section, the length of the pipe section directly connected with the filter is not less than 15cm.

Optionally, the inner diameter ratio of two adjacent pipe sections after and before expanding is not more than 2.

Alternatively, the wall thickness of the connecting tube section increases with increasing inner diameter.

Alternatively, the number of filters is two, and the two filters are respectively connected to both ends of the capillary tube through a connecting pipe section.

Optionally, the compression refrigeration system further comprises: the system comprises a compressor, a flow path switching valve, a first heat exchanger group and a second heat exchanger group; the compressor is provided with an exhaust port and an air return port; the flow path switching valve is a four-way valve and is provided with an inlet, a first outlet, a second outlet and a third outlet, the inlet is connected with an exhaust port of the compressor, the first outlet is connected with the first heat exchanger group, the second outlet is connected with the second heat exchanger group, the third outlet is connected with an air return port of the compressor, the first heat exchanger group is connected with the second heat exchanger group, and a capillary tube and a filter are arranged between the first heat exchanger group and the second heat exchanger group.

In particular, the application also provides an air conditioner comprising a compression refrigeration system according to any one of the above.

In the compression refrigeration system, the first end of the connecting pipe section is connected with one end of the capillary tube, the second end of the connecting pipe section is connected with the connecting port of the filter, and the connecting pipe section is further arranged in the direction from the first end to the second end of the connecting pipe section, so that the outer diameter of the second end of the connecting pipe section is adapted to the connecting port of the filter by expanding the inner diameter at least once, the turbulence intensity of a refrigerant flowing into the filter is reduced, and the vibration and noise of the whole compression refrigeration system are reduced.

Further, in the compression refrigeration system of the present application, the number of expansion times N of the connection pipe section, the inner diameter D of the capillary tube, and the inner diameter D of the connection port of the filter satisfy: when 2 ^k ·d＜D≤2 ^(k+1) At d, n=k+1, where k is a natural number, where 2 ^k D is understood to mean the inner diameter of the connecting tube segment 170 after expansion k times at a magnification of 2 times based on the inner diameter D of the capillary (i.e. the ratio of the inner diameters of the two tube segments after expansion and before expansion is 2), where D is still greater than 2 ^k D is less than or equal to 2 ^(k+1) D, that is, after the diameter is expanded k times at a magnification of 2 times, it is necessary to continue the diameter expansion once, that is, to determine the number of times of diameter expansion to be k+1 times.

Further, in the compression refrigeration system, the connecting pipe section is connected with the two pipe sections before and after diameter expansion through the flaring section, the included angle between the flaring section and the axis of the connecting pipe section is not more than 60 degrees, the flaring amplitude of the flaring section is ensured not to be too large, the cracking probability of the flaring section is reduced, and the mechanical strength of the whole connecting pipe section is further ensured.

The above, as well as additional objectives, advantages, and features of the present application will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present application when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic diagram of a compression refrigeration system according to one embodiment of the present application;

FIG. 2 is a schematic diagram of a filter-capillary connection in a compression refrigeration system according to one embodiment of the present application;

fig. 3 is a schematic block diagram of a cooling principle of an air conditioner according to an embodiment of the present application.

Detailed Description

It should be noted that, in the following description, the terms "center", "circumferential", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplify the description, and do not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

The description with reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature, i.e. one or more such features. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present application as the case may be.

Unless otherwise defined, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

Referring to fig. 1, fig. 1 is a schematic diagram of a compression refrigeration system 100 according to one embodiment of the present application.

The present application first provides a compression refrigeration system 100, and the compression refrigeration system 100 may generally include a compressor 110, a flow path switching valve 120, a first heat exchanger group 130, a capillary tube 150, a filter 160, and a second heat exchanger group 140 connected by refrigerant lines.

The compressor 110, which is the power of the refrigeration system 100, increases the pressure and temperature of the refrigerant vapor by compression, creating a condition for transferring heat of the refrigerant vapor to an external environment medium, i.e., compressing the low-temperature low-pressure refrigerant vapor to a high-temperature high-pressure state.

The first heat exchanger group 130 and the second heat exchanger group 140 are each a heat exchange device for exchanging heat with the refrigerant flowing therethrough by using the air of the respective environments.

The flow path heat exchange valve is disposed at an outlet of the compressor 110, and the flow path switching valve 120 may be a four-way valve having an inlet 121, a first outlet 122, a second outlet 123, and a third outlet 124. The inlet 121 is connected to the discharge port of the compressor 110, the first outlet 122 is connected to the first heat exchanger group 130, the second outlet 123 is connected to the second heat exchanger group 140, the third outlet 124 is connected to the return air port of the compressor 110, the first heat exchanger group 130 is connected to the second heat exchanger group 140, and a capillary tube 150 is disposed therebetween.

The four-way valve can switch the communication among the inlet 121, the first outlet 122, the second outlet 123 and the third outlet 124, so that the refrigerant discharged from the compressor 110 enters the first heat exchanger set 130 and then enters the second heat exchanger set 140, or enters the second heat exchanger set 140 and then enters the second heat exchanger set 140, so that the first heat exchanger set 130 or the second heat exchanger set 140 is switched between heat release and heat absorption.

Specifically, the four-way valve may be switched such that the inlet 121 is in communication with the first outlet 122, and the second outlet 123 is in communication with the third outlet 124. The high-temperature and high-pressure refrigerant discharged from the compressor 110 is discharged to the first heat exchanger group 130 through the inlet 121 and the first outlet 122. The high-temperature and high-pressure refrigerant can exchange heat and cool down when flowing through the first heat exchanger group 130 to form a low-temperature and high-pressure refrigerant. After being discharged from the first heat exchanger group 130, the low-temperature and high-pressure refrigerant flows through the capillary tube 150 again, and is throttled and depressurized by the capillary tube 150 to form a low-temperature and low-pressure refrigerant. The low-temperature low-pressure refrigerant is finally discharged into the second heat exchanger group 140, and is evaporated and absorbed in the second heat exchanger group 140 to reduce the temperature of surrounding air, and finally discharged from the second heat exchanger group 130, and then returned to the compressor 110 through the second outlet 123, the third outlet 124 and the air return port of the compressor 110 to be compressed again.

In a specific application scenario, when the second heat exchanger set 140 is set to adjust the temperature of the target environment, the above-mentioned switching of the four-way valve can be used for the second heat exchanger set 140 to absorb the heat of the target environment, that is, to realize refrigeration.

The four-way valve may also be switched such that the inlet 121 is in communication with the second outlet 123 and the first outlet 122 is in communication with the third outlet 124. The high-temperature and high-pressure refrigerant discharged from the compressor 110 is discharged to the second heat exchanger group 140 through the inlet 121 and the second outlet 123. The high-temperature and high-pressure refrigerant can exchange heat and cool down when flowing through the second heat exchanger group 140 to form a low-temperature and high-pressure refrigerant. After being discharged from the second heat exchanger 140, the low-temperature and high-pressure refrigerant flows through the capillary tube 150, and is throttled and depressurized by the capillary tube 150 to form a low-temperature and low-pressure refrigerant. The low-temperature low-pressure refrigerant is finally discharged into the first heat exchanger group 130, and evaporation and heat absorption are carried out in the first heat exchanger group 130 so as to reduce the temperature of surrounding air.

In a specific application scenario, when the second heat exchanger set 140 is set to adjust the temperature of the target environment, the above-mentioned switching of the four-way valve may be used for the second heat exchanger set 140 to emit heat to the target environment, that is, to achieve heating.

It should be noted that the first heat exchanger set 130 may be one heat exchanger or may be a plurality of heat exchangers connected in parallel. When a plurality of heat exchangers connected in parallel are adopted, each parallel pipeline is respectively provided with a control valve so as to control a refrigerant flow path. Likewise, the second heat exchanger set 140 may be one heat exchanger or a plurality of heat exchangers connected in parallel, which will not be described herein.

The filter 160 is used for filtering impurities in the refrigerant. Since the inner diameter of the capillary tube 150 is very small, in order to prevent impurities in the refrigerant from clogging the capillary tube 150, a filter 160 may be provided at an inlet of the capillary tube 150 to filter out impurities in the refrigerant to be introduced into the capillary tube 150 in advance.

Since the refrigerant can switch the flow direction under the action of the flow path switching valve 120, that is, both ends of the capillary tube 150 can be used as inlets, it is preferable to provide a filter 160 at both ends of the capillary tube 150, so as to ensure that the refrigerant can be filtered before entering the capillary tube 150 no matter what direction the refrigerant flows.

Since the above mentioned compressor 110, flow path switching valve 120, first heat exchanger group 130, capillary tube 150, filter 160 and second heat exchanger group 140 are well known to those skilled in the art, the specific working principle and internal structure thereof will not be described herein.

Referring to fig. 2, fig. 2 is a schematic diagram illustrating a connection relationship between a filter 160 and a capillary tube 150 in a compression refrigeration system 100 according to one embodiment of the present application.

In some embodiments, capillary tube 150 is connected to filter 160 by a connecting tube segment 170. Specifically, a first end of the connection tube segment 170 is connected to one end of the capillary tube 150, and a second end of the connection tube segment 170 is connected to a connection port of the filter 160.

The connecting tube segment 170 is further configured to: the outer diameter of the second end of the connection pipe section 170 is adapted to the connection port of the filter 160 by enlarging the inner diameter at least once in the direction from the first end to the second end thereof, and reduces the turbulence intensity of the refrigerant flowing into the filter 160.

The skilled artisan will appreciate that since a filter 160 is disposed at each end of the capillary tube 150, that is, there must also be a filter 160 downstream of the capillary tube 150. Generally, the inner diameter of the capillary tube 150 is very small, and the inner diameter of the capillary tube is about 0.4mm to 2.5mm, and the inner diameter of the filter 160 can reach about 10mm, so that compared with the capillary tube 150, the inner diameter of the filter 160 is much larger, the refrigerant flowing into the downstream filter 160 from the capillary tube 150 can be instantaneously released, the refrigerant flow direction is disturbed, turbulent abnormal sound is caused, and even the whole refrigerating system can cause severe vibration, so that the use experience of a user is influenced.

In the present embodiment, since the connection pipe section 170 is provided with one or more expansions in the direction from the first end to the second end thereof (i.e., in the direction from the capillary tube 150 to the downstream filter 160), the pressure of the refrigerant is gradually released within the connection pipe section 170 after the refrigerant flows out of the capillary tube 150, so that the refrigerant after the release of the pressure can smoothly enter the filter 160, thereby reducing the turbulent intensity of the refrigerant flowing into the filter 160, reducing the vibration and noise of the entire compression refrigeration system 100, and the above-mentioned technical effects have been verified in the trial production.

Furthermore, a section of the connecting tube section 170 closest to the connection port of the filter 160 is adapted to the connection port of the filter 160, so that the connecting tube section 170 is connected to the connection port of the filter 160.

Further, the number of expansion times N of the connection pipe 170, the inner diameter D of the capillary 150, and the inner diameter D of the connection port of the filter 160 satisfy: when 2 ^k ·d＜D≤2 ^(k+1) D, n=k+1, where k is a natural number.

The above relation is deformable as: when 2 ^k ＜D/d≤2 ^(k+1) When n=k+1, where k is a natural number. Where D/D may measure the difference between the inner diameter D of the capillary 150 and the inner diameter D of the connection port of the filter 160, the larger the k value, the larger the determined number of expanding times N.

That is, when the difference between the inner diameter D of the capillary tube 150 and the inner diameter D of the connection port of the filter 160 is larger, the inner diameter of the connection tube 170 can be gradually increased by multiple expanding, and the pressure can be gradually released after the refrigerant enters the connection tube 170, so that the pressure releasing process of the refrigerant is smoother, and new vibration and noise are not easy to generate.

Still further analysis of the relationship disclosed above: 2 ^k D is understood to mean the inner diameter of the connecting tube segment 170 after expansion k times by a factor of 2 (i.e. the ratio of the inner diameters of the two tube segments after expansion and before expansion is 2) based on the inner diameter D of the capillary 150, where D is still greater than 2 ^k D is less than or equal to 2 ^(k+1) D, that is to say, at a magnification of 2 timesAfter the expansion for k times, the expansion needs to be continued once, that is, the expansion times are determined to be k+1 times.

The last (i.e., k+1) expansion is mainly aimed at adapting the inner diameter of the connection port of the filter 160 to meet the installation requirement. In some special cases, however, the final expansion can be performed at a rate of 2 times, and the inner diameter after expansion is just adapted to the connection port of the filter 160.

The following is an example.

For example, when the inner diameter D of the capillary 150 is 2mm and the inner diameter D of the connection port of the filter 160 is 3.7mm, then taking k=0, i.e., D < d.ltoreq.2d, it can be determined that the number of expansion times N of the connection tube segment 170 is 1. That is, when the connecting tube 170 is connected to the connection port of the filter 160 after the inner diameter of the capillary tube 150 is enlarged once, the problem of adapting the connecting tube 170 to the filter 160 is solved after the inner diameter of the capillary tube 150 is enlarged once, and the pressure is released in advance before the refrigerant enters the filter 160, so that the turbulence intensity of the refrigerant flowing into the filter 160 is reduced, and the vibration and noise of the whole compression refrigeration system 100 are reduced.

The fitting of the connection port of the filter 160 should be determined according to the manner in which the connection pipe 170 is fitted to the connection port of the filter 160. For example, when the connection pipe 170 is to be inserted into the connection port of the filter 160 during installation, the inner diameter after the expansion is required to take into consideration the influence of the pipe wall thickness. When the connection pipe 170 is directly butt-welded to the connection port of the filter 160 at the time of installation, it is necessary to match the inside diameter of the pipe after the diameter expansion with the connection port of the filter 160.

For another example, when the inner diameter D of the capillary 150 is 2.7mm and the inner diameter D of the connection port of the filter 160 is 9.52mm, k=1, that is, 2D < d.ltoreq.4d, it can be determined that the number of expansion times N of the connection tube segment 170 is 2.

That is, since the connection pipe 170 is connected to the connection port of the filter 160 after the inner diameter is enlarged twice from the end of the capillary 150, the connection port of the filter 160 needs to be adapted after the last diameter enlargement.

When determining the inner diameter after the first expansion, a suitable inner diameter value may be selected according to a relevant design specification (e.g., a refrigeration circuit design specification). For example, when the inner diameter D of the capillary 150 is 2.7mm, the inner diameter D of the connection port of the filter 160 is 9.52mm, the inner diameter of the pipe section after the first expansion may be 4.76mm, and the inner diameter of the pipe section after the second expansion may be 9.52mm (but since the wall thickness of the refrigerant pipe is small, generally about 0.6mm to 1.5mm, the influence of the pipe wall thickness is temporarily ignored here).

It should be noted, however, that the ratio of the inner diameters of the two adjacent pipe sections after and before the expansion is not preferably greater than 2, so as to avoid the formation of new turbulence in the connecting pipe caused by the excessive expansion amplitude.

For another example, when the inner diameter D of the capillary 150 is 2.7mm and the inner diameter D of the connection port of the filter 160 is 18.85mm, then taking k=2, that is, 4D < d.ltoreq.8d, it can be determined that the number of expansion times N of the connection tube segment 170 is 3. The inner diameter of the pipe section after the first expansion may be 4.76mm, the inner diameter of the pipe section after the second expansion may be 9.52mm, and the inner diameter of the pipe section after the third expansion may be 18.85mm.

It should be noted that the specific values are for illustration and not meant to be a requirement for selecting the specific dimensions, and those skilled in the art can determine the number of expansion times according to the relation disclosed above in combination with the actual situation.

In some embodiments, the connecting tube segment 170 is further configured to connect two tube segments before and after expanding by the flared section 180.

Further, the included angle θ between the flared section 180 and the axis of the connecting pipe section 170 does not exceed 60 °, so that the flared amplitude of the flared section 180 is ensured not to be too large, the probability of cracking of the flared section 180 is reduced, and the mechanical strength of the whole connecting pipe section 170 is further ensured.

In some embodiments, the ratio of the lengths of two adjacent pre-and post-expanded pipe sections is between 1 and 2, such as 1, 1.5, 2, etc.

That is, the length of the pipe section after the expansion is smaller than that of the pipe section before the expansion, so that the impulse degree formed after the refrigerant enters the pipe section after the expansion can be reduced, and the turbulence noise caused by the turbulence of the refrigerant flow can be further reduced.

In some embodiments, the length of the tube segment directly connected to the filter 160 in the connecting tube segment 170 is no less than 15cm.

When the connection pipe section 170 is installed by means of the installation method of the connection port of the insertion filter 160, it is required to ensure that the length of the insertion filter 160 reaches 15cm under some specifications, so that the length of the pipe section directly connected to the filter 160 (i.e., the last pipe section) is set to be not less than 15cm to ensure that the last pipe section is long enough to meet the installation requirements.

In some embodiments, the wall thickness of the connection tube segment 170 increases with the increase of the inner diameter to ensure that the connection tube segment 170 will not fail or break under high pressure, high temperature, etc., and to ensure the reliability of the entire refrigeration system.

Referring to fig. 3, fig. 3 is a schematic block diagram of a cooling principle of an air conditioner 200 according to an embodiment of the present application.

In addition, the present application also provides an air conditioner 200, and the compression refrigeration system 100 can be used for the refrigeration equipment.

The air conditioner 200 may take various forms, such as a split type air conditioner, an integrated type air conditioner, a duct type air conditioner, and the like.

Taking a split type air conditioner as an example, it may include an indoor unit 210 installed indoors and an outdoor unit 220 installed outdoors. The compressor 110 and the first heat exchanger group 130 are disposed in the outdoor unit 220, and the second heat exchanger group 140 is disposed at the indoor unit 210, that is, the second heat exchanger group 140 is disposed to regulate the temperature of the target environment.

Further, the flow path switching valve 120, the capillary tube 150, and the filter 160 are also disposed in the outdoor unit 220.

The split type air conditioner may further include an outdoor unit fan 222, and the outdoor unit fan 222 is disposed in the outdoor unit 220 to promote the first heat exchanger group 130 to exchange heat with the outdoor air.

Further, the split type air conditioner may further include an indoor unit fan 212. The indoor unit fan 212 is disposed in the indoor unit 210 to promote the heat exchange between the second heat exchanger set 140 and the indoor air.

In the compression refrigeration system 100 of the present application, since the first end of the connection pipe section 170 is connected to one end of the capillary tube 150, the second end of the connection pipe section 170 is connected to the connection port of the filter 160, and the connection pipe section 170 is further configured such that the outer diameter of the second end of the connection pipe section 170 is adapted to the connection port of the filter 160 by expanding the inner diameter at least once in the direction from the first end to the second end thereof, and the turbulence intensity of the refrigerant flowing into the filter 160 is reduced, and the vibration and noise of the entire compression refrigeration system 100 are reduced.

Further, in the compression refrigeration system 100 of the present application, the number of expansion times N of the connection pipe section 170, the inner diameter D of the capillary tube 150, and the inner diameter D of the connection port of the filter 160 satisfy the following conditions: when 2 ^k ·d＜D≤2 ^(k+1) When the diameter is expanded by a factor of 2 (i.e., the ratio of the inner diameters of the two pipe sections after and before the diameter expansion is 2), the inner diameter of the connecting pipe section 170 after the previous k times of diameter expansion approaches the inner diameter of the connection port of the filter 160, and on this basis, the diameter expansion is insufficient for 2 times, so that the final (k+1 times) diameter expansion should be aimed at adapting the inner diameter of the connection port of the filter 160 to meet the installation requirement.

Further, in the compression refrigeration system 100 of the present application, the number of expansion times N of the connection pipe section 170, the inner diameter D of the capillary tube 150, and the inner diameter D of the connection port of the filter 160 satisfy the following conditions: when 2 ^k ·d＜D≤2 ^(k+1) When the difference between the inner diameter of the capillary tube 150 and the inner diameter of the connection port of the filter 160 is larger, the k value is larger, and the determined number of expanding times N is larger, so that the inner diameter of the connection tube segment 170 can be gradually expanded in a multiple expanding manner, and the pressure can be gradually released after the refrigerant enters the connection tube segment 170, so that the process of releasing the pressure of the refrigerant is smoother, and new vibration and noise are not easy to generate.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the application have been shown and described herein in detail, many other variations or modifications of the application consistent with the principles of the application may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the application. Accordingly, the scope of the present application should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A compression refrigerating system comprises a capillary tube and a filter which are connected in series in a refrigerant circulation flow path and are connected through a connecting pipe section, and is characterized in that,

the first end of the connecting tube section is connected with one end of the capillary tube, the second end of the connecting tube section is connected with the connecting port of the filter, and the connecting tube section is further provided with:

the outer diameter of the second end of the connecting pipe section is adapted to the connection port of the filter by enlarging the inner diameter at least once in the direction from the first end to the second end, and the turbulence intensity of the refrigerant flowing into the filter is reduced.

2. The compression refrigeration system of claim 1, wherein,

the number of expanding times N of the connecting pipe section, the inner diameter D of the capillary and the inner diameter D of the connecting port of the filter satisfy the following conditions:

when 2 ^k ·d＜D≤2 ^(k+1) D, n=k+1, where k is a natural number.

3. The compression refrigeration system of claim 1, wherein,

the connecting pipe section is also arranged to connect the two pipe sections before and after the expanding through the flaring section.

4. The compression refrigeration system of claim 1, wherein,

the length ratio of two adjacent pipe sections before and after expanding is between 1 and 2.

5. The compression refrigeration system of claim 1, wherein,

in the connecting pipe section, the length of the pipe section directly connected with the filter is not less than 15cm.

6. The compression refrigeration system of claim 1, wherein,

the inner diameter ratio of two adjacent pipe sections after and before expanding is not more than 2.

7. The compression refrigeration system of claim 1, wherein,

the wall thickness of the connecting tube section increases with increasing inner diameter.

8. The compression refrigeration system of claim 1, wherein,

the number of the filters is two, and the two filters are respectively connected to the two ends of the capillary tube through one connecting tube section.

9. The compression refrigeration system of claim 1, further comprising:

the system comprises a compressor, a flow path switching valve, a first heat exchanger group and a second heat exchanger group;

the compressor is provided with an exhaust port and a return air port;

the flow path switching valve is a four-way valve and is provided with an inlet, a first outlet, a second outlet and a third outlet, the inlet is connected with an exhaust port of the compressor, the first outlet is connected with the first heat exchanger group, the second outlet is connected with the second heat exchanger group, the third outlet is connected with a return air port of the compressor, the first heat exchanger group is connected with the second heat exchanger group, and the capillary tube and the filter are arranged between the first outlet and the second heat exchanger group.

10. An air conditioner characterized by comprising the compression refrigeration system according to any one of claims 1 to 9.