Patent Description:
Silencers are generally arranged on outdoor units of air conditioners, but limited space in a compressor compartment hinders the arrangement of a low frequency silencer or of more silencers, causing a poor silencing effect. In addition, four-way valve components generally require a separate external silencer, and the weight of the silencer leads to heavy weight of the whole machine. Moreover, the outdoor units are generally installed outdoors at a high altitude, and during installation or transportation, the outdoor units may fall, leading to deformation or breakage of pipelines and other problems that affect their use.

Prior art document <CIT> discloses a plurality of honeycomb pipes bundling a plurality of fine tubes that are inserted and fixed at desired positions in a refrigerant piping at proper intervals to form a silencer, and noise is reduced by straightening and homogenizing the disturbance of refrigerant and attenuating transmission of pressure pulsations.

The present invention a aims to solve at least one of the technical problems existing in the related art. To this end, an objective of the present invention is to provide an indoor unit for an air conditioner, with a first silencer and a second silencer arranged in a housing of the indoor unit, solving the problem that the limited space in the compressor compartment hinders the arrangement of the silencers.

An air conditioning indoor unit according to invention is set out in claim <NUM> and includes: a housing; a heat exchanger arranged in the housing; a first silencer arranged in the housing and coupled to a first end of the heat exchanger; and a second silencer arranged in the housing and coupled to a second end of the heat exchanger, and the air conditioning indoor unit further includes a third silencer coupled to an end of the first silencer away from the heat exchanger, wherein in a heating mode, refrigerant discharged from a compressor flows to the third silencer, and then to the first silencer.

For the air conditioning indoor unit according to the embodiments of the present disclosure, by arranging the first silencer and the second silencer within the housing, and making the first silencer coupled to the first end of the heat exchanger and the second silencer coupled to the second end of the heat exchanger, the second silencer can be used for silencing during cooling and the first silencer can be used for silencing during heating, to reduce radiation of acoustic energy from the compressor to the heat exchanger, achieve the purpose of silencing at the front end of the heat exchanger in different operating conditions, and greatly improve noise transmission from the compressor to the room; moreover, the problem that more silencers or longer low-frequency silencers cannot be arranged due to space limitation in the vertical direction of the compressor compartment can be solved, and the weight of the outdoor unit can be reduced to a certain extent, avoiding deformation and breakage of pipelines of the outdoor unit caused by the fall of the outdoor unit. In addition, the four-way valve silencer of the outdoor unit can be eliminated, which increases the natural frequency of the four-way valve, so that the natural frequency of the four-way valve is less likely to resonate with the natural frequency of the compressor, and the pipeline design difficulty can be lowered. Furthermore, when the refrigerant flows through the first silencer and the second silencer, the cross-sectional area in the middle is larger than the cross-sectional area at either ends after the abrupt change in the cross section of the silencer, which is conducive to improving the heat transfer efficiency and enhancing the cooling/heating performance.

According to some embodiments of the present disclosure, a length of the second silencer is greater than the third silencer, and the length of the third silencer is greater than a length of the first silencer.

According to some embodiments of the present disclosure, a cross-sectional area of a second silencing cavity of the second silencer is smaller than a cross-sectional area of a third silencing cavity of the third silencer, and the cross-sectional area of the third silencing cavity is smaller than a cross-sectional area of a first silencing cavity of the first silencer.

According to some embodiments of the present disclosure, the first silencer includes a first body, a first connection tube, and a second connection tube, the first body forming a first silencing cavity; the first connection tube is coupled to an end of the first body and the first end of the heat exchanger; the second connection tube is coupled to an other end of the first body and inserted into the first silencing cavity; the second silencer includes a second body, a first communicating tube and a second communicating tube, the second body forming the second silencing cavity; the first communicating tube is coupled to a first end of the second body and the second end of the heat exchanger; the second communicating tube is coupled to a second end of the second body and inserted into the second silencing cavity; a refrigerant flows from the second end of the heat exchanger to the first end of the heat exchanger in a cooling mode, and the refrigerant flows from the first end of the heat exchanger to the second end of the heat exchanger in a heating mode; an end of the second connection tube located in the first silencing cavity is closed, and a plurality of first through-holes are formed on a peripheral wall of a part, located in the first silencing cavity, of the second connection tube; and/or an end of the second communicating tube located in the second silencing cavity is closed, and a plurality of second through-holes are formed on a peripheral wall of a part, located in the second silencing cavity, of the second communicating tube.

According to some embodiments of the present disclosure, the first through-hole has a diameter ranging from <NUM> to <NUM>, and/or the second through-hole has a diameter ranging from <NUM> to <NUM>.

According to some embodiments of the present disclosure, a distance between the first through-hole farthest away from the closed end of the second connection tube and an end of the first silencing cavity adjacent to the second connection tube is greater than <NUM>; and/or a distance between the second through-hole farthest away from the closed end of the second communicating tube and an end of the second silencing cavity adjacent to the second communicating tube is greater than <NUM>.

According to some embodiments of the present disclosure, the plurality of first through-holes are divided into a plurality of groups, each group including at least two first through-holes; the first through-holes in each group are spaced along an axial direction of the second connection tube, the plurality of groups of first through-holes are spaced along a peripheral direction of the second connection tube, and two adjacent groups of first through-holes are staggered in the peripheral direction of the second connection tube; and/or the plurality of second through-holes are divided into a plurality of groups, each group including at least two second through-holes; the second through-holes in each group are spaced along an axial direction of the second communicating tube, the plurality of groups of second through-holes are spaced along a peripheral direction of the second communicating tube, and two adjacent groups of second through-holes are staggered in the peripheral direction of the second communicating tube.

According to some embodiments of the present disclosure, the first silencer includes a first body, a first connection tube, and a second connection tube, the first body forming a first silencing cavity; the first connection tube is coupled to an end of the first body and the first end of the heat exchanger and is inserted into the first silencing cavity; the second connection tube is coupled to an other end of the first body and inserted into the first silencing cavity; the second silencer includes a second body, a first communicating tube and a second communicating tube, the second body forming a second silencing cavity; the first communicating tube is coupled to a first end of the second body and the second end of the heat exchanger and is inserted into the first silencing cavity; the second communicating tube is coupled to a second end of the second body and inserted into the second silencing cavity; a refrigerant flows from the second end of the heat exchanger to the first end of the heat exchanger in a cooling mode, and the refrigerant flows from the first end of the heat exchanger to the second end of the heat exchanger in a heating mode; a length of the second connection tube located in the first silencing cavity is greater than a length of the first connection tube located in the first silencing cavity; and/or a length of the second communicating tube located in the second silencing cavity is greater than a length of the first communicating tube located in the second silencing cavity.

According to some embodiments of the present disclosure, the first silencer includes a first body, a first connection tube, and a second connection tube, the first body forming a first silencing cavity; the first connection tube is coupled to an end of the first body and the first end of the heat exchanger and is inserted into the first silencing cavity; the second connection tube is coupled to an other end of the first body and inserted into the first silencing cavity; the second silencer includes a second body, a first communicating tube and a second communicating tube, the second body forming a second silencing cavity; the first communicating tube is coupled to a first end of the second body and the second end of the heat exchanger and is inserted into the first silencing cavity; the second communicating tube is coupled to a second end of the second body and inserted into the second silencing cavity; a length of the second connection tube located in the first silencing cavity and a length of the first connection tube located in the first silencing cavity are both not greater than one quarter of a length of the first silencer; and/or a length of the second communicating tube located in the second silencing cavity and a length of the first communicating tube located in the second silencing cavity are both not greater than one quarter of a length of the second silencer.

According to some embodiments of the present disclosure, the first silencer extends along a width direction of the housing, and the second silencer extends along a length direction of the housing.

Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

These and/or other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:.

Embodiments of the present disclosure will be described below in detail. Examples of the embodiments are illustrated in the accompanying drawings, where the same or similar reference numerals throughout the specification refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present disclosure rather than limit the present disclosure.

An air conditioning indoor unit <NUM> according to embodiments of the present disclosure will be described below with reference to the accompanying drawings. The air conditioning indoor unit <NUM> can be assembled with an air conditioning outdoor unit to form an air conditioner and to regulate an indoor ambient temperature. Optionally, the air conditioning indoor unit <NUM> is a wall-mounted air conditioning indoor unit or a floor-mounted air conditioning indoor unit.

As shown in <FIG>, the air conditioning indoor unit <NUM> according to an embodiment of the present disclosure may include a housing <NUM>, a heat exchanger <NUM>, a first silencer <NUM>, and a second silencer <NUM>.

Specifically, the heat exchanger <NUM>, the first silencer <NUM> and the second silencer <NUM> may all be located in the housing <NUM>, with the first silencer <NUM> being coupled to a first end of the heat exchanger <NUM> and the second silencer <NUM> being coupled to a second end of the heat exchanger <NUM>.

Specifically, in a cooling mode, a high-temperature and high-pressure refrigerant discharged from a compressor first flows to the outdoor heat exchanger <NUM>, the refrigerant from the outdoor heat exchanger <NUM> may flow to the second end of the heat exchanger <NUM> after being silenced by the second silencer <NUM> and exchange heat in the heat exchanger <NUM>, and the refrigerant after the heat exchange may flow to the first silencer <NUM> through the first end of the heat exchanger <NUM>; in a heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor flows to the first silencer <NUM>, further flows to the heat exchanger <NUM> through the first end of the heat exchanger <NUM> after being silenced by the first silencer <NUM> and exchanges heat in the heat exchanger <NUM>, and the refrigerant after the heat exchange may flow to the second silencer <NUM> through the second end of the heat exchanger <NUM>.

It is known to those skilled in the art that the silencing principle of silencers is to form an abrupt change in a cross section between two ends of a pipeline and a middle part of the pipeline (forming an expansion chamber), so that impedance mismatch occurs during the flow of sound waves emitted by the compressor through the silencer, making part of the sound waves interfere with the original sound waves, and reducing noise.

Therefore, by arranging the first silencer <NUM> and the second silencer <NUM> within the housing <NUM>, and making the first silencer <NUM> coupled to the first end of the heat exchanger <NUM> and the second silencer <NUM> coupled to the second end of the heat exchanger <NUM>, the second silencer <NUM> can be used for silencing during cooling and the first silencer <NUM> can be used for silencing during heating, to reduce radiation of acoustic energy from the compressor to the heat exchanger <NUM>, achieve the purpose of silencing at a front end of the heat exchanger <NUM> in different operating conditions, and greatly improve noise transmission from the compressor to the room; moreover, a problem that more silencers or longer low-frequency silencers cannot be arranged due to space limitation in a vertical direction of a compressor compartment can be solved, and the weight of the outdoor unit can be reduced to a certain extent, avoiding deformation and breakage of pipelines of the outdoor unit caused by the fall of the outdoor unit. In addition, a four-way valve silencer of the outdoor unit can be eliminated, which increases the natural frequency of the four-way valve, so that the natural frequency of the four-way valve is less likely to resonate with the natural frequency of the compressor, and the pipeline design difficulty can be lowered. Furthermore, when the refrigerant flows through the first silencer and the second silencer, a cross-sectional area in the middle is larger than a cross-sectional area at either ends after the abrupt change in the cross section of the silencer, which is conducive to improving the heat transfer efficiency and enhancing the cooling/heating performance.

For the air conditioning indoor unit <NUM> according to the embodiments of the present disclosure, by arranging the first silencer <NUM> and the second silencer <NUM> within the housing <NUM>, and making the first silencer <NUM> coupled to the first end of the heat exchanger <NUM> and the second silencer <NUM> coupled to the second end of the heat exchanger <NUM>, the second silencer <NUM> can be used for silencing during cooling and the first silencer <NUM> can be used for silencing during heating, to reduce radiation of acoustic energy from the compressor to the heat exchanger <NUM>, achieve the purpose of silencing at the front end of the heat exchanger <NUM> in different operating conditions, and greatly improve noise transmission from the compressor to the room; moreover, the problem that more silencers or longer low-frequency silencers cannot be arranged due to space limitation in the vertical direction of the compressor compartment can be solved, and the weight of the outdoor unit can be reduced to a certain extent, avoiding deformation and breakage of pipelines of the outdoor unit caused by the fall of the outdoor unit. In addition, the four-way valve silencer of the outdoor unit can be eliminated, which increases the natural frequency of the four-way valve, so that the natural frequency of the four-way valve is less likely to resonate with the natural frequency of the compressor, and the pipeline design difficulty can be lowered. Furthermore, when the refrigerant flows through the first silencer and the second silencer, the cross-sectional area in the middle is larger than the cross-sectional area at either ends after the abrupt change in the cross section of the silencer, which is conducive to improving the heat transfer efficiency and enhancing the cooling/heating performance.

Referring to <FIG>, in some embodiments of the present disclosure, the first silencer <NUM> includes a first body <NUM>, a first connection tube <NUM>, and a second connection tube <NUM>; the first body <NUM> forms a first silencing cavity <NUM>; the first connection tube <NUM> is coupled to an end of the first body <NUM> and the first end of the heat exchanger <NUM>; and the second connection tube <NUM> is coupled to an other end of the first body <NUM> and inserted into the first silencing cavity <NUM>. Thus, by inserting the second connection tube <NUM> into the first silencing cavity <NUM>, a position of an impedance mismatch interface within the first silencing cavity <NUM> can be changed, the silencing volume near a passing frequency can be improved, and a silencing function of a specific frequency band can be realized with a good effect.

Specifically, for example, as shown in <FIG>, the first connection tube <NUM> is coupled to one axial end of the first body <NUM> and the first end of the heat exchanger <NUM>, and the second connection tube <NUM> is coupled to the other axial end of the first body <NUM> and inserted into the first silencing cavity <NUM>. Optionally, respective axes of the first connection tube <NUM>, the first body <NUM> and the second connection tube <NUM> are parallel to each other. For example, the axes of the first connection tube <NUM>, the first body <NUM> and the second connection tube <NUM> are co-linear. Thus, the structure is simple and the silencing effect is good.

Optionally, as shown in <FIG>, an end of the second connection tube <NUM> located in the first silencing cavity <NUM> is open, so that circulation of the refrigerant between the first silencing cavity <NUM> and the second connection tube <NUM> is facilitated, and the structure is simple.

Certainly, the present disclosure is not limited thereto. As shown in <FIG>, the end of the second connection tube <NUM> located in the first silencing cavity <NUM> is closed, and a plurality of first through-holes <NUM> are formed on a peripheral wall of a part, located in the first silencing cavity <NUM>, of the second connection tube <NUM>. Thus, for transmitted sound of specific frequencies, the Helmholtz resonator principle can be used, so that the acoustic energy flowing through the second connection tube <NUM> is absorbed due to resonance, and the silencing effect is improved.

In some embodiments of the present disclosure, the first through-hole <NUM> has a diameter ranging from <NUM> to <NUM>. It can be understood that the smaller the diameter is, the better the silencing effect is. Thus, the silencing effect is further enhanced.

For example, the diameter of the first through-hole <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or etc..

Optionally, the number of the first through-holes <NUM> may be two, five or eight. It can be understood that the smaller the number of holes is, the lower the frequency that can be eliminated is. Thus, it is beneficial to eliminate noise at low frequencies.

In some embodiments of the present disclosure, as shown in <FIG>, a distance between the first through-hole <NUM> farthest away from the closed end of the second connection tube <NUM> and an end of the first silencing cavity <NUM> adjacent to the second connection tube <NUM> is greater than <NUM>. That is, the distance between the first through-hole <NUM> farthest away from the closed end of the second connection tube <NUM> and a side wall of the first silencing cavity <NUM> for the second connection tube <NUM> to pass through is denoted as L1 which is greater than <NUM>. Thus, the silencing effect can be further enhanced, and the processing and manufacturing can be facilitated.

For example, L1 may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or <NUM>.

In some optional embodiments of the present disclosure, the plurality of first through-holes <NUM> are divided into a plurality of groups, each group including at least two first through-holes <NUM>. The first through-holes <NUM> in each group are spaced along an axial direction of the second connection tube <NUM>; the plurality of groups of first through-holes <NUM> are spaced along a peripheral direction of the second connection tube <NUM>; and two adjacent groups of first through-holes <NUM> are staggered in the peripheral direction of the second connection tube <NUM>. For example, as shown in <FIG>, fourteen first through-holes <NUM> are divided into four groups, in which two groups have four first through-holes <NUM> and the other two groups have three first through-holes <NUM>. The first through-holes <NUM> in each group are spaced apart from one another in the axial direction of the second connection tube <NUM>; four groups of first through-holes <NUM> are spaced apart from one another in the peripheral direction of the second connection tube <NUM>; and two adjacent groups of first through-holes <NUM> are staggered in the peripheral direction of the second connection tube <NUM>. Thus, the silencing effect can be further improved.

Optionally, with reference to <FIG>, in the two adjacent groups of first through-holes <NUM>, a line connecting centers of two adjacent first through-holes <NUM> and a central axis of the second connection tube <NUM> form an angle α ranging from <NUM>° to <NUM>°. That is, one of the two adjacent first through-holes <NUM> belongs to one group of first through-holes <NUM>, the other of the two adjacent first through-holes <NUM> belongs to the other group of first through-holes <NUM>, and these two groups of first through-holes <NUM> are adjacent, in which the angle α between the line connecting centers of the two adjacent first through-holes <NUM> and the central axis of the second connection tube <NUM> ranges from <NUM>° to <NUM>°. For example, the angle α is such as <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>° or etc..

Optionally, a distance between two adjacent first through-holes <NUM> in each group of first through-holes <NUM> is greater than <NUM>, thereby further improving the silencing effect and facilitating processing and manufacturing. For example, the distance between the two adjacent first through-holes <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

In some embodiments of the present disclosure, the first connection tube <NUM> is inserted into the first silencing cavity <NUM>, and a length of the second connection tube <NUM> located in the first silencing cavity <NUM> is greater than a length of the first connection tube <NUM> located in the first silencing cavity <NUM>. Thus, it is conducive to improving the silencing effect of the first silencer <NUM> in the heating mode.

Optionally, the length of the second connection tube <NUM> located in the first silencing cavity <NUM> and the length of the first connection tube <NUM> located in the first silencing cavity <NUM> are both not greater than one quarter of the length of the first silencer <NUM>. That is, the length of the second connection tube <NUM> located in the first silencing cavity <NUM> is not greater than one quarter of the length of the first silencer <NUM>, and the length of the first connection tube <NUM> located in the first silencing cavity <NUM> is not greater than one quarter of the length of the first silencer <NUM>. The length of the first connection tube <NUM> located in the first silencing cavity <NUM> and the length of the second connection tube <NUM> located in the first silencing cavity <NUM> may be equal or may be unequal. Specifically, referring to <FIG>, the length of the first silencer <NUM> is L2, the length of the first connection tube <NUM> in the first silencing cavity <NUM> is L3, and the length of the second connection tube <NUM> in the first silencing cavity <NUM> is L4, in which L2, L3 and L4 satisfy L3≤<NUM>/4L2 and L4≤<NUM>/4L2. Thus, the structure of the first silencer <NUM> is reasonably optimized and the silencing effect is improved.

Certainly, it can be understood that the first connection tube <NUM> may also not be inserted into the first silencing cavity <NUM>, and the first connection tube <NUM> is just coupled to a connection port of the first silencing cavity <NUM> to be in communication with the first silencing cavity <NUM>; the length of the second connection tube <NUM> located in the first silencing cavity <NUM> is not greater than a half of the length of the first silencer <NUM>, i.e., L4≤<NUM>/2L2. Thus, the silencing effect of the first silencer <NUM> in the heating mode can be improved.

Referring to <FIG>, in some embodiments of the present disclosure, the second silencer <NUM> includes a second body <NUM>, a first communicating tube <NUM> and a second communicating tube <NUM>. The second body <NUM> forms a second silencing cavity <NUM>. The first communicating tube <NUM> is coupled to a first end of the second body <NUM> and the second end of the heat exchanger <NUM>. The second communicating tube <NUM> is coupled to a second end of the second body <NUM>, and the second communicating tube <NUM> is inserted into the second silencing cavity <NUM>. Thus, by inserting the second communicating tube <NUM> into the second silencing cavity <NUM>, a position of an impedance mismatch interface within the second silencing cavity <NUM> can be changed, the silencing volume near a passing frequency can be improved, and a silencing function of a specific frequency band can be realized with a good effect.

Specifically, for example, as shown in <FIG>, the first communicating tube <NUM> is coupled to one axial end of the second body <NUM> and the second end of the heat exchanger <NUM>, and the second communicating tube <NUM> is coupled to the other axial end of the second body <NUM> and inserted into the second silencing cavity <NUM>. Optionally, respective axes of the first communicating tube <NUM>, the second body <NUM>, and the second communicating tube <NUM> are parallel to each other. For example, the axes of the first communicating tube <NUM>, the second body <NUM>, and the second communicating tube <NUM> are co-linear. Thus, the structure is simple and the silencing effect is good.

Optionally, as shown in <FIG>, an end of the second communicating tube <NUM> located in the second silencing cavity <NUM> is open, so that circulation of the refrigerant between the second silencing cavity <NUM> and the second communicating tube <NUM> is facilitated, and the structure is simple.

Certainly, the present disclosure is not limited thereto. As shown in <FIG>, the end of the second communicating tube <NUM> located in the second silencing cavity <NUM> is closed, and a plurality of second through-holes <NUM> are formed on a peripheral wall of a part, located in the second silencing cavity <NUM>, of the second communicating tube <NUM>. Thus, for transmitted sound of specific frequencies, the Helmholtz resonator principle can be used, so that the acoustic energy flowing through the second communicating tube <NUM> is absorbed due to resonance, and the silencing effect is improved.

In some embodiments of the present disclosure, the second through-hole <NUM> has a diameter ranging from <NUM> to <NUM>. It can be understood that the smaller the diameter is, the better the silencing effect is. Thus, the silencing effect is further enhanced.

For example, the diameter of the second through-hole <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or etc..

Optionally, the number of the second through-holes <NUM> may be two, five or eight. It can be understood that the smaller the number of holes is, the lower the frequency that can be eliminated is. Thus, it is beneficial to eliminate noise at low frequencies.

In some embodiments of the present disclosure, as shown in <FIG>, a distance between the second through-hole <NUM> farthest away from the closed end of the second communicating tube <NUM> and an end of the second silencing cavity <NUM> adjacent to the second communicating tube <NUM> is greater than <NUM>. That is, the distance between the second through-hole <NUM> farthest away from the closed end of the second communicating tube <NUM> and a side wall of the second silencing cavity <NUM> for the second communicating tube <NUM> to pass through is denoted as L5 which is greater than <NUM>. Thus, the silencing effect can be further enhanced, and the processing and manufacturing can be facilitated.

For example, L5 may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or <NUM>.

In some optional embodiments of the present disclosure, the plurality of second through-holes <NUM> are divided into a plurality of groups, each group including at least two second through-holes <NUM>. The second through-holes <NUM> in each group are spaced along an axial direction of the second communicating tube <NUM>; the plurality of groups of second through-holes <NUM> are spaced along a peripheral direction of the second communicating tube <NUM>; and two adjacent groups of second through-holes <NUM> are staggered in the peripheral direction of the second communicating tube <NUM>. For example, as shown in <FIG>, fourteen second through-holes <NUM> are divided into four groups, in which two groups have four second through-holes <NUM> and the other two groups have three second through-holes <NUM>. The second through-holes <NUM> in each group are spaced apart from one another in the axial direction of the second communicating tube <NUM>; four groups of second through-holes <NUM> are spaced apart from one another in the peripheral direction of the second communicating tube <NUM>; and two adjacent groups of second through-holes <NUM> are staggered in the peripheral direction of the second communicating tube <NUM>. Thus, the silencing effect can be further improved.

Optionally, with reference to <FIG>, in the two adjacent groups of second through-holes <NUM>, a line connecting centers of two adjacent second through-holes <NUM> and a central axis of the second communicating tube <NUM> form an angle β ranging from <NUM>° to <NUM>°. That is, one of the two adjacent second through-holes <NUM> belongs to one group of second through-holes <NUM>, the other of the two adjacent second through-holes <NUM> belongs to the other group of second through-holes <NUM>, and these two groups of second through-holes <NUM> are adjacent, in which the angle β between the line connecting centers of the two adjacent second through-holes <NUM> and the central axis of the second communicating tube <NUM> ranges from <NUM>° to <NUM>°. For example, the angle β is such as <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>° or etc..

Optionally, a distance between two adjacent second through-holes <NUM> in each group of second through-holes <NUM> is greater than <NUM>, thereby further improving the silencing effect and facilitating processing and manufacturing. For example, the distance between the two adjacent second through-holes <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

In some embodiments of the present disclosure, the first communicating tube <NUM> is inserted into the second silencing cavity <NUM>, and a length of the second communicating tube <NUM> located in the second silencing cavity <NUM> is greater than a length of the first communicating tube <NUM> located in the second silencing cavity <NUM>. Thus, it is conducive to improving the silencing effect of the second silencer <NUM> in the cooling mode.

Optionally, the length of the second communicating tube <NUM> located in the second silencing cavity <NUM> and the length of the first communicating tube <NUM> located in the second silencing cavity <NUM> are both not greater than one quarter of the length of the second silencer <NUM>. That is, the length of the second communicating tube <NUM> located in the second silencing cavity <NUM> is not greater than one quarter of the length of the second silencer <NUM>, and the length of the first communicating tube <NUM> located in the second silencing cavity <NUM> is not greater than one quarter of the length of the second silencer <NUM>. The length of the first communicating tube <NUM> located in the second silencing cavity <NUM> and the length of the second communicating tube <NUM> located in the second silencing cavity <NUM> may be equal or may be unequal. Specifically, referring to <FIG>, the length of the second silencer <NUM> is L6, the length of the first communicating tube <NUM> in the second silencing cavity <NUM> is L7, and the length of the second communicating tube <NUM> in the second silencing cavity <NUM> is L8, in which L6, L7 and L8 satisfy L7≤<NUM>/4L6 and L8≤<NUM>/4L6. Thus, the structure of the second silencer <NUM> is reasonably optimized and the silencing effect is improved.

Certainly, it can be understood that the first communicating tube <NUM> may also not be inserted into the second silencing cavity <NUM>, and the first communicating tube <NUM> is just coupled to a connection port of the second silencing cavity <NUM> to be in communication with the second silencing cavity <NUM>; the length of the second communicating tube <NUM> located in the second silencing cavity <NUM> is not greater than a half of the length of the second silencer <NUM>, i.e., L8≤<NUM>/2L6.

According to some embodiments of the present disclosure, the air conditioning indoor unit <NUM> further includes a third silencer <NUM> coupled to an end of the first silencer <NUM> away from the heat exchanger <NUM>. Specifically, in the heating mode, the high-temperature and high-pressure refrigerant discharged from the compressor flows to the third silencer <NUM>, then flows to the first silencer <NUM>, and further flows to the heat exchanger <NUM> through the first end of the heat exchanger <NUM> after being silenced by the first silencer <NUM> and exchanges heat in the heat exchanger <NUM>, such that the refrigerant after the heat exchange can flow to the second silencer <NUM> through the second end of the heat exchanger <NUM>. Thus, in the heating mode, the purpose of two-stage silencing at the front end of the heat exchanger <NUM> can be achieved, and the radiation of acoustic energy from the compressor to the heat exchanger <NUM> during heating can be further reduced to improve the silencing effect.

Certainly, it can be understood that the air conditioning indoor unit <NUM> may also include a fourth silencer, which may be coupled to an end of the second silencer <NUM> away from the heat exchanger <NUM>. Specifically, for example, in the cooling mode, the high-temperature and high-pressure refrigerant discharged from the compressor first flows to the outdoor heat exchanger <NUM>, and the refrigerant flowing from the outdoor heat exchanger <NUM> may flow to the second end of the heat exchanger <NUM> after being silenced by the fourth silencer and the second silencer <NUM> and exchange heat in the heat exchanger <NUM>, such that the refrigerant after the heat exchange may flow to the first silencer <NUM> through the first end of the heat exchanger <NUM>. Thus, in the cooling mode, the purpose of two-stage silencing at the front end of the heat exchanger <NUM> can be achieved, and the radiation of acoustic energy from the compressor to the heat exchanger <NUM> during cooling can be further reduced to improve the silencing effect.

According to some embodiments of the present disclosure, a cross-sectional area of the second silencing cavity <NUM> of the second silencer <NUM> is smaller than a cross-sectional area of a third silencing cavity <NUM> of the third silencer <NUM>, and the cross-sectional area of the third silencing cavity <NUM> is smaller than the cross-sectional area of the first silencing cavity <NUM> of the first silencer <NUM>. The above arrangement is conducive to adjusting expansion ratios of the first silencer <NUM> to the third silencer <NUM>, and silencers with different expansion ratios are adopted to achieve multi-stage silencing and improve the silencing effect.

In some optional embodiments of the present disclosure, the length of the second silencer <NUM> is greater than the length of the third silencer <NUM>, and the length of the third silencer <NUM> is greater than the length of the first silencer <NUM>. It can be understood that the longer the silencer is, the better the silencing effect on sound transmitted at low frequency is. Since the compressor noise at certain frequencies is still loud after passing through the silencers, sound transmitted at different frequencies can be silenced by making the lengths of the first silencer <NUM> to the third silencer <NUM> different, which can improve the silencing effect.

It can be understood that particular specifications of the silencers can be selected according to the cooling/heating conditions and the transmission frequency of the compressor sound.

Optionally, the first silencer <NUM>, the second silencer <NUM> and the third silencer <NUM> have different expansion ratios. Since the compressor noise at certain frequencies is still loud after passing through the silencers, the silencing effect can be improved through multi-stage silencing realized by adopting silencers with different expansion ratios. Optionally, the expansion ratios of the first silencer <NUM>, the second silencer <NUM> and the third silencer <NUM> are values greater than <NUM> and less than <NUM>. Thus, it is conducive to improving the silencing effect.

Referring to <FIG>, in some embodiments of the present disclosure, the third silencer <NUM> includes a third body <NUM>, a first joint pipe <NUM> and a second joint pipe <NUM>. The third body <NUM> forms a third silencing cavity <NUM>. The first joint pipe <NUM> is coupled to a first end of the third body <NUM> and the second connection tube <NUM>. The second joint pipe <NUM> is coupled to a second end of the third body <NUM>, and the second joint pipe <NUM> is inserted into the third silencing cavity <NUM>. Thus, by inserting the second joint pipe <NUM> into the third silencing cavity <NUM>, a position of an impedance mismatch interface within the third silencing cavity <NUM> can be changed, the silencing volume near a passing frequency can be improved, and a silencing function of a specific frequency band can be realized with a good effect.

Specifically, for example, as shown in FIGS. <NUM>-<NUM>, the first joint pipe <NUM> is coupled to one axial end of the third body <NUM> and the second end of the second connection tube <NUM>, and the second joint pipe <NUM> is coupled to the other axial end of the third body <NUM> and inserted into the third silencing cavity <NUM>. Optionally, respective axes of the first joint pipe <NUM>, the second joint pipe <NUM>, and the third body <NUM> are parallel to each other. For example, the axes of the first joint pipe <NUM>, the second joint pipe <NUM>, and the third body <NUM> are co-linear. Thus, the structure is simple and the silencing effect is good.

Optionally, as shown in <FIG>, an end of the second joint pipe <NUM> located in the third silencing cavity <NUM> is open, so that circulation of the refrigerant between the third silencing cavity <NUM> and the second joint pipe <NUM> is facilitated, and the structure is simple.

Certainly, the present disclosure is not limited thereto. As shown in <FIG>, the end of the second joint pipe <NUM> located in the third silencing cavity <NUM> is closed, and a plurality of third through-holes <NUM> are formed on a peripheral wall of a part, located in the third silencing cavity <NUM>, of the second joint pipe <NUM>. Thus, for transmitted sound of specific frequencies, the Helmholtz resonator principle can be used, so that the acoustic energy flowing through the second joint pipe <NUM> is absorbed due to resonance, and the silencing effect is improved.

In some embodiments of the present disclosure, the third through-hole <NUM> has a diameter ranging from <NUM> to <NUM>. It can be understood that the smaller the diameter is, the better the silencing effect is. Thus, the silencing effect is further enhanced.

For example, the diameter of the third through-hole <NUM> may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or etc..

Optionally, the number of the third through-holes <NUM> may be two, five or eight. It can be understood that the smaller the number of holes is, the lower the frequency that can be eliminated is. Thus, it is beneficial to eliminate noise at low frequencies.

In some embodiments of the present disclosure, as shown in <FIG>, a distance between the third through-hole <NUM> farthest away from the closed end of the second joint pipe <NUM> and an end of the third silencing cavity <NUM> adjacent to the second joint pipe <NUM> is greater than <NUM>. That is, the distance between the third through-hole <NUM> farthest away from the closed end of the second joint pipe <NUM> and a side wall of the third silencing cavity <NUM> for the second joint pipe <NUM> to pass through is denoted as L9 which is greater than <NUM>. Thus, the silencing effect can be further enhanced, and the processing and manufacturing can be facilitated.

For example, L9 may be <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or <NUM>.

In some optional embodiments of the present disclosure, the plurality of third through-holes <NUM> are divided into a plurality of groups, each group including at least two third through-holes <NUM>. The third through-holes <NUM> in each group are spaced along an axial direction of the second joint pipe <NUM>; the plurality of groups of third through-holes <NUM> are spaced along a peripheral direction of the second joint pipe <NUM>; and two adjacent groups of third through-holes <NUM> are staggered in the peripheral direction of the second joint pipe <NUM>. For example, as shown in <FIG>, fourteen third through-holes <NUM> are divided into four groups, in which two groups have four third through-holes <NUM> and the other two groups have three third through-holes <NUM>. The third through-holes <NUM> in each group are spaced apart from one another in the axial direction of the second joint pipe <NUM>; four groups of third through-holes <NUM> are spaced apart from one another in the peripheral direction of the second joint pipe <NUM>; and two adjacent groups of third through-holes <NUM> are staggered in the peripheral direction of the second joint pipe <NUM>. Thus, the silencing effect can be further improved.

Optionally, with reference to <FIG>, in the two adjacent groups of third through-holes <NUM>, a line connecting centers of two adjacent third through-holes <NUM> and a central axis of the second joint pipe <NUM> form an angle γ ranging from <NUM>° to <NUM>°. That is, one of the two adjacent third through-holes <NUM> belongs to one group of third through-holes <NUM>, the other of the two adjacent third through-holes <NUM> belongs to the other group of third through-holes <NUM>, and these two groups of third through-holes <NUM> are adjacent, in which the angle γ between the line connecting centers of the two adjacent third through-holes <NUM> and the central axis of the second joint pipe <NUM> ranges from <NUM>° to <NUM>°. For example, the angle γ is such as <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>°, <NUM>° or etc..

Optionally, a distance between two adjacent third through-holes <NUM> in each group of third through-holes <NUM> is greater than <NUM>, thereby further improving the silencing effect and facilitating processing and manufacturing. For example, the distance between the two adjacent third through-holes <NUM> is <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or <NUM>.

In some embodiments of the present disclosure, the first joint pipe <NUM> is inserted into the third silencing cavity <NUM>, and a length of the second joint pipe <NUM> located in the third silencing cavity <NUM> is greater than a length of the first joint pipe <NUM> located in the third silencing cavity <NUM>. Thus, it is conducive to improving the silencing effect of the third silencer <NUM> in the heating mode.

Optionally, the length of the second joint pipe <NUM> located in the third silencing cavity <NUM> and the length of the first joint pipe <NUM> located in the third silencing cavity <NUM> are both not greater than one quarter of the length of the third silencer <NUM>. That is, the length of the second joint pipe <NUM> located in the third silencing cavity <NUM> is not greater than one quarter of the length of the third silencer <NUM>, and the length of the first joint pipe <NUM> located in the third silencing cavity <NUM> is not greater than one quarter of the length of the third silencer <NUM>. The length of the first joint pipe <NUM> located in the third silencing cavity <NUM> and the length of the second joint pipe <NUM> located in the third silencing cavity <NUM> may be equal or may be unequal. Specifically, referring to <FIG>, the length of the third silencer <NUM> is L10, the length of the first joint pipe <NUM> in the third silencing cavity <NUM> is L11, and the length of the second joint pipe <NUM> in the third silencing cavity <NUM> is L12, in which L10, L11 and L12 satisfy L11≤<NUM>/4L10 and L12≤<NUM>/4L10. Thus, the structure of the third silencer <NUM> is reasonably optimized and the silencing effect is improved.

Certainly, it can be understood that the first joint pipe <NUM> may also not be inserted into the third silencing cavity <NUM>, and the first joint pipe <NUM> is just coupled to a connection port of the third silencing cavity <NUM> to be in communication with the third silencing cavity <NUM>; the length of the second joint pipe <NUM> located in the third silencing cavity <NUM> is not greater than a half of the length of the third silencer <NUM>, i.e., L12≤<NUM>/2L10.

In some embodiments of the present disclosure, the first silencer <NUM> extends along a width direction of the housing (e.g., an up-down direction in <FIG>), and the second silencer <NUM> extends along a length direction of the housing (e.g., a left-right direction in <FIG>). Specifically, for example, the air conditioning indoor unit <NUM> is a wall-mounted air conditioning indoor unit; the first silencer <NUM>, the second silencer <NUM>, and the third silencer <NUM> are all located on a rear side of the heat exchanger <NUM>; and at least a part of a projection of the first silencer <NUM>, at least a part of a projection of the second silencer <NUM>, and at least a part of a projection of the third silencer <NUM> are all located in a projection of the heat exchanger in a plane perpendicular to a front-rear direction, in which the length direction of the housing is the left-right direction, and the width direction of the housing is the up-and-down direction. As another example, the air conditioning indoor unit <NUM> is a floor-mounted air conditioning indoor unit <NUM>; the first silencer <NUM>, the second silencer <NUM> and the third silencer <NUM> are all located at the rear side of the heat exchanger <NUM>; and at least a part of a projection of the first silencer <NUM>, at least a part of a projection of the second silencer <NUM>, and at least a part of a projection of the third silencer <NUM> are all located in a projection of the heat exchanger in a plane perpendicular to a front-rear direction, in which the length direction of the housing is the up-down direction, and the width direction of the housing is the left-right direction. Thus, the specific structure of the housing can be fully utilized to arrange the first silencer and the second silencer <NUM> without increasing the volume of the housing.

In some optional embodiments of the present disclosure, as shown in <FIG>, the air conditioning indoor unit <NUM> further includes a first refrigerant tube <NUM> and a second refrigerant tube <NUM>; the first refrigerant tube <NUM> is coupled to the first end of the heat exchanger <NUM> and the second refrigerant tube <NUM> is coupled to the second end of the heat exchanger <NUM>; the first silencer <NUM> and the third silencer <NUM> are coupled in series in the first refrigerant tube <NUM> and the second silencer <NUM> is coupled in series in the second refrigerant tube <NUM>. Thus, the structure is simple, which facilitates the connection of the air conditioning indoor unit <NUM> to the air conditioning outdoor unit.

Optionally, the first refrigerant tube <NUM> is coupled with a low-pressure tube connection bolt <NUM> at an end of the first refrigerant tube <NUM> away from the heat exchanger <NUM>, and the second refrigerant tube <NUM> is coupled with a high-pressure tube connection bolt <NUM> at an end of the second refrigerant tube <NUM> away from the heat exchanger <NUM>, which facilitates the connection of the air conditioning indoor unit <NUM> to the air conditioning outdoor unit.

In the description of the present disclosure, it is to be understood that terms such as "central," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "circumferential" and the like should be construed to refer to orientations or positions as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not indicate or imply that the device or element referred to must have a particular orientation or be constructed or operated in a particular orientation. Thus, these terms shall not be construed as limitations on the present disclosure. In the description of the present disclosure, "a plurality of" means two or more than two. In the description of the present disclosure, a structure in which a first feature is "on" or "below" a second feature may include an embodiment in which the first feature is in direct contact with the second feature, and may also include an embodiment in which the first feature and the second feature are not in direct contact with each other, but are contacted via an additional feature formed therebetween. In the description of the present disclosure, a first feature "on," "above," or "on top of" a second feature may include an embodiment in which the first feature is right or obliquely "on," "above," or "on top of" the second feature, or just means that the first feature is at a height higher than that of the second feature.

Claim 1:
An air conditioning indoor unit (<NUM>), comprising:
a housing (<NUM>);
a heat exchanger (<NUM>) arranged in the housing (<NUM>);
a first silencer (<NUM>) arranged in the housing (<NUM>) and coupled to a first end of the heat exchanger (<NUM>); and
a second silencer (<NUM>) arranged in the housing (<NUM>) and coupled to a second end of the heat exchanger (<NUM>), ,
characterized in that,
a third silencer (<NUM>) coupled to an end of the first silencer (<NUM>) away from the heat exchanger (<NUM>), wherein in a heating mode refrigerant discharged from a compressor flows to the third silencer (<NUM>), and then to the first silencer (<NUM>).