Air conditioning system

Abstract

The air conditioning system according to this disclosure comprises a housing having an air intake port and an exhaust port, a centrifugal fan that draws in air from the air intake port and blows out air from the exhaust port, a fan casing that surrounds the outer circumference of the centrifugal fan and has an intake port and an exhaust port, and a heat exchanger disposed downstream of the centrifugal fan and having a plurality of heat transfer tubes and a plurality of fins, wherein the fan casing has a seal portion provided on the periphery of the discharge port that divides the inside of the housing into a fan intake space where the fan casing is located and a heat exchanger upstream space where the heat exchanger is located, and the area of ​​the front surface of the heat exchanger facing the discharge port is larger than the area of ​​the discharge port.

Description

Technical Field

[0001] The present disclosure relates to an air conditioner.

Background Art

[0002] Conventionally, there is an air conditioner equipped with: a casing that forms an air passage connecting an air inlet and an air outlet; a fan arranged downstream of the air inlet for generating an air flow; and a heat exchanger arranged downstream of the fan (see, for example, Patent Document 1).

[0003] When the air volume flowing through the heat exchanger is increased, abnormal noise is generated when the air flow passes through the fins of the heat exchanger. The generation of this abnormal noise is caused by the high wind speed on the suction surface of the heat exchanger. On the other hand, when the air volume flowing through the heat exchanger is reduced to suppress the generation of abnormal noise, the heat exchange amount is reduced. Therefore, in the air conditioner of Patent Document 1, the heat exchanger is arranged to be inclined with respect to the air blowing direction in order to improve air circulation efficiency and heat exchange efficiency.

Prior Art Literature

Patent Literature

[0004]

Patent Document 1

Summary of Invention

Problem to be Solved by the Invention

[0005] However, when the heat exchanger is arranged to be inclined with respect to the air blowing direction as in the air conditioner described in Patent Document 1, if the air flow discharged from the fan flows into the heat exchanger while maintaining a partial high-speed region, the air flow will be bent at a steep angle depending on the orientation of the fins, which increases ventilation resistance and may cause abnormal noise.

[0006] This disclosure aims to solve the above-mentioned problems and to provide an air conditioning system that can suppress the generation of abnormal noise without reducing the amount of air flowing through the heat exchanger. [Means for solving the problem]

[0007] The air conditioning system according to this disclosure comprises a housing having an intake port and an exhaust port, a centrifugal fan that draws in air from the intake port and blows out air from the exhaust port, a fan casing that surrounds the outer circumference of the centrifugal fan and has an intake port and an outlet port, and a heat exchanger disposed downstream of the centrifugal fan and having a plurality of heat transfer tubes and a plurality of fins, wherein the fan casing has a seal portion provided on the periphery of the outlet port that divides the inside of the housing into a fan intake space where the fan casing is located and a heat exchanger upstream space where the heat exchanger is located, a scroll portion that straightens the air drawn in from the intake port, a diffuser located at the end of the winding of the scroll portion and extending to the outlet, and a tongue portion located at the beginning of the winding of the scroll portion, and the heat exchanger is inclined so that its upper part is located on one of the front side and the rear side of the housing and its lower part is located on the other side. The area of ​​the front surface of the heat exchanger facing the discharge port is larger than the area of ​​the discharge port. The tongue portion has an inclined shape such that the width of the diffuser gradually increases from the side where the lower part of the heat exchanger is located to the side where the upper part of the heat exchanger is located, on either the front or back side of the scroll portion. [Effects of the Invention]

[0008] Air conditioning system related to this disclosure In, The fan casing has a sealing portion provided around the periphery of the discharge port, which separates the upstream space of the heat exchanger from the fan intake space. By improving the airtightness between the upstream space of the heat exchanger and the fan intake space, the reduction in the amount of air drawn in from the intake port of the fan casing can be suppressed, and the decrease in the amount of air flowing to the heat exchanger can be suppressed. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic diagram of the air conditioning system according to Embodiment 1, viewed from a diagonal front angle. [Figure 2] This is a schematic diagram showing the inside of the air conditioning system according to Embodiment 1, viewed from the front. [Figure 3] This is a schematic diagram showing a side view of the inside of the air conditioning system according to Embodiment 1. [Figure 4] This is a schematic diagram showing a front view of the fan casing according to Embodiment 1. [Figure 5] This is a schematic diagram of the fan casing according to Embodiment 1, viewed from diagonally above. [Figure 6] This is a schematic diagram of the fan casing according to Embodiment 2, viewed from the front, illustrating the area of ​​the discharge port. [Figure 7] This is a schematic diagram of a fan casing according to Embodiment 2, viewed from above, illustrating the area of ​​the discharge port. [Figure 8] This is a schematic diagram showing the inside of the air conditioning system according to Embodiment 3, viewed from the front. [Figure 9] This is a schematic diagram showing a side view of the inside of the air conditioning system according to Embodiment 3. [Figure 10] This is a schematic diagram showing the inside of the air conditioning system according to Embodiment 4, viewed from the front. [Figure 11] This is a schematic diagram showing a side view of the inside of the air conditioning system according to Embodiment 4. [Figure 12] This is a schematic diagram showing the inside of the air conditioning system according to Embodiment 5, viewed from the front. [Figure 13] This is a schematic diagram showing a side view of the inside of the air conditioning system according to Embodiment 5. [Figure 14] This is a schematic diagram showing the inside of the air conditioning system according to Embodiment 6, viewed from the front. [Figure 15] This is a schematic diagram showing a side view of the inside of the air conditioning system according to Embodiment 6. [Figure 16] This is a schematic diagram showing the inside of the air conditioning system according to Embodiment 8, viewed from the front. [Figure 17] This is a schematic diagram showing a side view of the inside of the air conditioning system according to Embodiment 8. [Figure 18] It is a schematic diagram illustrating a method for attaching a fan plate according to Embodiment 8 to a fan casing. MODE FOR CARRYING OUT THE INVENTION

[0010] In the following embodiments, an example of an air conditioner according to the present disclosure will be described with reference to the drawings. In each of the drawings, components denoted by the same reference numerals are identical or equivalent to each other, and this is common throughout the entire specification. Furthermore, the forms of the constituent elements shown throughout the specification are merely examples of the air conditioner according to the present disclosure. The air conditioner according to the present disclosure is not limited to the forms of the constituent elements shown throughout the specification.

[0011] Embodiment 1. FIG. 1 is a schematic diagram of the air conditioner 100 according to Embodiment 1 viewed from an obliquely forward direction. As shown in FIG. 1, the air conditioner 100 according to Embodiment 1 is a floor-standing type. A casing 3 constituting the air conditioner 100 has a rectangular parallelepiped shape, and has a front surface A, a rear surface B, a left side surface C, and a right side surface D. An air inlet 1 is formed at a lower portion of the front surface A of the casing 3, and an air outlet 2 is formed at an upper portion of the front surface A.

[0012] FIG. 2 is a schematic front view of the interior of the air conditioner 100 according to Embodiment 1. FIG. 3 is a schematic side view of the interior of the air conditioner 100 according to Embodiment 1. As shown in FIGS. 2 and 3, inside the housing 3, there are provided a centrifugal fan 5 that sucks air from an air-conditioned space into the housing 3 through an air inlet 1 and blows the air out of the housing 3 through an air outlet 2, and a heat exchanger 4 disposed downstream of the centrifugal fan 5 that exchanges heat between a refrigerant flowing inside the heat exchanger and the air sucked into the housing 3. The heat exchanger 4 includes a plurality of heat transfer tubes 4a through which the refrigerant flows, and a plurality of fins 4b made of aluminum material and provided between the heat transfer tubes 4a. The heat exchanger 4 is disposed inclined with respect to the air blowing direction. Specifically, the heat exchanger 4 is disposed inclined such that the lower portion thereof is on the front surface A side and the upper portion thereof is on the back surface B side. The inclination direction of the heat exchanger 4 is not limited to the above, and the heat exchanger 4 may be disposed inclined such that the upper portion is on the front surface A side and the lower portion is on the back surface B side. The heat exchanger 4 also has a front surface 22 which is a suction surface facing a discharge port 13 to be described later, and a blowing surface 23 facing the air outlet 2. The centrifugal fan 5 is a centrifugal fan, and has a plurality of blades for sucking air. The centrifugal fan 5 is housed in a fan casing 6.

[0013] FIG. 4 is a schematic front view of the fan casing 6 according to Embodiment 1. FIG. 5 is a schematic view of the fan casing 6 according to Embodiment 1 as viewed obliquely from above. As shown in FIGS. 4 and 5, the fan casing 6 includes a suction port 7 through which air is sucked by the centrifugal fan 5, a scroll portion 8 that rectifies the sucked airflow, a diffuser 9 located at a winding end portion 14 of the scroll portion 8, extending to the discharge port 13 and effectively performing static pressure conversion, the discharge port 13 that discharges airflow toward the heat exchanger 4, and a tongue portion 15 located at a winding start portion 16 of the scroll portion 8 and having a shape inclined toward the discharge port 13 direction.

[0014] Furthermore, the fan casing 6 is provided around the periphery of the discharge port 13 and has a sealing portion 12 that divides the inside of the housing 3 into a heat exchanger upstream space 11 (see Figure 3) where the heat exchanger 4 is located and a fan suction space 10 (see Figure 3) where the centrifugal fan 5 is located. The sealing portion 12 is integral with the fan casing 6, and its connection can be either curved or angled. Also, as shown in Figure 3, the area of ​​the front surface 22 of the heat exchanger 4 facing the discharge port 13 is larger than the area of ​​the discharge port 13.

[0015] Here, the effect of the seal portion 12 will be explained. If the heat exchanger upstream space 11 where the heat exchanger 4 is located and the fan intake space 10 where the centrifugal fan 5 is located are not partitioned, the air drawn in by the intake port 7 of the fan casing 6 is drawn in by the air discharged from the discharge port 13, reducing the amount of air drawn in from the intake port 7. As a result, the amount of air flowing to the heat exchanger 4 is reduced, and the amount of heat exchanged decreases. Therefore, the seal portion 12 partitions the heat exchanger upstream space 11 and the fan intake space 10, and improves the airtightness between the heat exchanger upstream space 11 and the fan intake space 10. By doing so, the air conditioning system 100 according to Embodiment 1 can suppress the reduction in the amount of air drawn in from the intake port 7 of the fan casing 6, and can suppress the reduction in the amount of air flowing to the heat exchanger 4. Furthermore, by doing so, the air conditioning system 100 according to Embodiment 1 can draw in more air from the intake port 7 of the fan casing 6 at the same rotational speed compared to a system where the heat exchanger upstream space 11 and the fan intake space 10 are not partitioned, and the rotational speed of the centrifugal fan 5 can be reduced, thereby reducing power consumption.

[0016] Next, the operation of the air conditioning system 100 according to Embodiment 1 will be described. The airflow drawn in from the intake port 1 into the housing 3 by the centrifugal fan 5 flows into the intake port 7 of the fan casing 6, is straightened by the scroll section 8, and is guided to the discharge port 13 by the diffuser 9. The airflow guided to the discharge port 13 is diffused in a jet-like manner into the upstream space 11 of the heat exchanger. The diffused airflow has a uniform wind speed distribution and proceeds toward the front surface 22 of the heat exchanger 4. Here, the air conditioning system 100 has a refrigerant circuit to which the heat exchanger 4 is connected by refrigerant piping, and the refrigerant is circulated in this refrigerant circuit, and heat is exchanged between the refrigerant flowing through the heat exchanger 4 and the air, thereby heating or cooling the space to be air-conditioned. In addition, the airflow from the centrifugal fan 5 passes through the heat exchanger 4 from the front surface 22 to the discharge surface 23, which promotes heat exchange between the air and the refrigerant. The airflow that has passed through the heat exchanger 4 and undergone heat exchange is sent out to the outside of the housing 3 through the exhaust port 2.

[0017] As described above, the airflow discharged from the outlet 13 of the fan casing 6 is diffused into a jet-like flow, and the airflow discharged from the centrifugal fan 5 is directed to spread out toward the front surface 22 of the heat exchanger 4. As a result, the area through which the airflow passes is increased, and the air velocity is made uniform even when the heat exchanger 4 is inclined with respect to the direction of airflow, thus suppressing abnormal noise generated when the airflow passes between the fins 4b of the heat exchanger 4. Furthermore, if the fan intake space 10 and the heat exchanger upstream space 11 are not partitioned, the air drawn in by the intake port 7 of the fan casing 6 is drawn in by the air discharged from the outlet 13, reducing the amount of air drawn in from the intake port 7. As a result, the amount of airflow to the heat exchanger 4 is reduced, and the amount of heat exchanged decreases. Therefore, the heat exchanger upstream space 11 and the fan intake space 10 are partitioned by the seal portion 12, and the airtightness between the heat exchanger upstream space 11 and the fan intake space 10 is increased. By doing so, the air conditioning system 100 according to Embodiment 1 can suppress the reduction in the amount of air drawn in from the intake port 7 of the fan casing 6, and can suppress the reduction in the amount of air flowing to the heat exchanger 4. Furthermore, by doing so, the air conditioning system 100 according to Embodiment 1 can draw in more air from the intake port 7 of the fan casing 6 at the same rotational speed compared to when the upstream space 11 of the heat exchanger and the fan intake space 10 are not partitioned, and the rotational speed of the centrifugal fan 5 can be reduced, thereby reducing power consumption.

[0018] As described above, the air conditioning system 100 according to Embodiment 1 comprises a housing 3 having an air intake port 1 and an exhaust port 2, a centrifugal fan 5 that draws in air from the air intake port 1 and blows out air from the exhaust port 2, a fan casing 6 that surrounds the outer circumference of the centrifugal fan 5 and has an intake port 7 and an exhaust port 13, and a heat exchanger 4 that is arranged downstream of the centrifugal fan 5 and has heat transfer tubes 4a and fins 4b, and the fan casing 6 has a seal portion 12 provided on the periphery of the exhaust port 13 that divides the inside of the housing 3 into a fan intake space 10 in which the fan casing 6 is arranged and a heat exchanger upstream space 11 in which the heat exchanger 4 is arranged, and the area of ​​the front surface 22 of the heat exchanger 4 facing the exhaust port 13 is larger than the area of ​​the exhaust port 13.

[0019] According to the air conditioning system 100 of Embodiment 1, the area of ​​the front surface 22 of the heat exchanger 4 facing the discharge port 13 of the fan casing 6 is larger than the area of ​​the discharge port 13 of the fan casing 6. Therefore, the airflow discharged from the discharge port 13 of the fan casing 6, which is smaller than the area of ​​the front surface 22 of the heat exchanger 4, spreads rapidly, mixes with the surrounding air and diffuses, and then passes through the front surface 22 of the heat exchanger 4, which is larger than the area of ​​the discharge port 13 of the fan casing 6. As a result, even if the heat exchanger 4 is inclined with respect to the direction of airflow, the air velocity distribution is made uniform, and the generation of abnormal noise can be suppressed. In addition, the fan casing 6 has a seal portion 12 provided on the periphery of the discharge port 13, and this seal portion 12 separates the upstream space 11 of the heat exchanger from the fan suction space 10, thereby improving the airtightness between the upstream space 11 of the heat exchanger and the fan suction space 10. By doing so, the air conditioning device 100 according to Embodiment 1 can suppress a reduction in the amount of air drawn in from the intake port 7 of the fan casing 6, and can suppress a reduction in the amount of air flowing to the heat exchanger 4.

[0020] Embodiment 2. The following describes Embodiment 2, but the explanation will be omitted for parts that overlap with Embodiment 1, and the same reference numerals will be used for parts that are the same as or corresponding to Embodiment 1. Furthermore, Embodiment 2 will be described primarily for the differences from Embodiment 1.

[0021] Figure 6 is a schematic front view of the fan casing 6 according to Embodiment 2 and illustrates the area of ​​the discharge port 13. Figure 7 is a schematic plan view of the fan casing 6 according to Embodiment 2 and illustrates the area of ​​the discharge port 13.

[0022] Embodiment 2 shows a configuration that allows adjustment of the vertical air velocity distribution in the upstream space 11 of the heat exchanger. As shown in Figures 6 and 7, the tongue portion 15 of the fan casing 6 is located at the winding start portion 16 of the scroll portion 8 and has a shape that is inclined toward the discharge port 13. The tongue portion 15 has an inclined shape in which the width of the diffuser 9 gradually increases from the front A side to the back B side, and the width on the back B side is greater than the width on the front A side of the discharge port 13. Furthermore, the area of ​​the discharge port 13 increases from the ZZ cross section to the YY cross section above it, and then to the XX cross section above that.

[0023] In the case of the air conditioner 100 according to Embodiment 2, in which the fan casing 6 is configured in this manner, the airflow discharged from the outlet 13 tends to flow more easily to the rear B side than to the front A side. For example, if a local wind velocity is generated at the lower side of the front 22 of the heat exchanger 4, that is, if the wind velocity is high at the lower side of the front 22 of the heat exchanger 4, the width of the rear B side of the outlet 13 is greater than the width of the front A side, so the airflow tends to flow more easily to the rear B side than to the front A side. As a result, the airflow tends to flow more easily to the upper part of the heat exchanger 4 located on the rear B side of the housing 3, and the local wind velocity at the bottom of the heat exchanger 4 is reduced, thus suppressing the generation of abnormal noise. Note that the shape of the fan casing 6 is not limited to the above, and the shape of the inclination of the tongue portion 15 can be changed depending on the location of the abnormal noise generation in the heat exchanger 4, thereby changing the way the outlet 13 widens.

[0024] In the air conditioning device 100 according to Embodiment 2, the fan casing 6 has a scroll section 8 that straightens the air drawn in from the intake port 7, a diffuser 9 located at the end of the winding portion 14 of the scroll section 8 and extending to the discharge port 13, and a tongue section 15 located at the beginning of the winding portion 16 of the scroll section 8. The heat exchanger 4 is inclined so that its upper part is located on one of the front A side and the rear B side of the housing 3, and its lower part is located on the other side. The tongue section 15 has an inclined shape such that the width of the diffuser 9 gradually increases from the side where the lower part of the heat exchanger 4 is located to the side where the upper part of the heat exchanger 4 is located, on either the front A side or the rear B side of the scroll section 8.

[0025] According to the air conditioning device 100 of Embodiment 2, the tongue portion 15 has a sloping shape in which the width of the diffuser 9 gradually increases from the side where the lower part of the heat exchanger 4 is located to the side where the upper part of the heat exchanger 4 is located, on either the front A side or the rear B side of the scroll portion 8. As a result, airflow can easily flow over the upper part of the heat exchanger 4, and the local air velocity at the lower part of the heat exchanger 4 is reduced, thereby suppressing the generation of abnormal noise.

[0026] Embodiment 3. The following describes Embodiment 3, but the explanation will be omitted for parts that overlap with Embodiments 1 and 2, and the same reference numerals will be used for parts that are the same as or corresponding to Embodiments 1 and 2. Furthermore, Embodiment 3 will be described primarily for its differences from Embodiments 1 and 2.

[0027] Figure 8 is a schematic front view of the inside of the air conditioning system 100 according to Embodiment 3. Figure 9 is a schematic side view of the inside of the air conditioning system 100 according to Embodiment 3.

[0028] In Embodiment 3, a flow straightening member 17 is provided in the upstream space 11 of the heat exchanger, from the discharge port 13 of the fan casing 6 to the heat exchanger 4.

[0029] When the heat exchanger 4 is positioned at an angle with its lower part facing the front A side and its upper part facing the rear B side, the airflow discharged from the outlet 13 of the fan casing 6, when it approaches the heat exchanger 4 at a sharp angle to the main flow, generates vortices (so-called cavity vortices) between the leading edges of the fins, causing abnormal noise (so-called cavitation noise).

[0030] Therefore, as shown in Figures 8 and 9, by providing a flow straightening member 17 in the upstream space 11 of the heat exchanger from the discharge port 13 to the heat exchanger 4, the inflow angle of the airflow flowing into the heat exchanger 4 is forcibly bent, and the airflow passes between the fins 4b. As a result, the flow straightening member 17 can suppress the generation of abnormal noise. In Embodiment 3, the flow straightening member 17 is provided from the inner surface of the left side C to the inner surface of the right side D of the housing 3, but it is not limited to that, and it is sufficient if it is attached to at least one inner surface of the front A, back B, left side C, and right side D of the housing 3. Also, the shape of the flow straightening member 17 in Embodiment 3 is a rectangular parallelepiped, but it is not limited to that, and it may be cylindrical or other shapes. Furthermore, the material of the flow straightening member 17 may be metal or plastic, and is not limited. Also, the mounting angle of the flow straightening member 17 is not limited.

[0031] As described above, the air conditioning system 100 according to Embodiment 3 is equipped with a flow straightening member 17 that is arranged in the upstream space 11 of the heat exchanger from the discharge port 13 to the heat exchanger 4 and is attached to at least one inner surface of the front A, rear B, left side C, and right side D of the housing 3.

[0032] According to the air conditioning system 100 of Embodiment 3, by providing a flow straightening member 17 in the upstream space 11 of the heat exchanger from the discharge port 13 to the heat exchanger 4, the inflow angle of the airflow flowing into the heat exchanger 4 is forcibly bent, and the airflow passes between the fins 4b. As a result, the flow straightening member 17 can suppress the generation of abnormal noise.

[0033] Embodiment 4. The following describes Embodiment 4, but the explanation will be omitted for parts that overlap with Embodiments 1 to 3, and the same reference numerals will be used for parts that are the same as or corresponding to Embodiments 1 to 3. Furthermore, Embodiment 4 will be described primarily for its differences from Embodiments 1 to 3.

[0034] Figure 10 is a schematic front view of the inside of the air conditioning system 100 according to Embodiment 4. Figure 11 is a schematic side view of the inside of the air conditioning system 100 according to Embodiment 4.

[0035] The heat exchanger 4A according to Embodiment 4, as shown in Figures 10 and 11, has two opposing headers 18 (18a, 18b), a plurality of flat-shaped heat transfer tubes 19, and a plurality of corrugated fins 20, and is characterized in that the plurality of heat transfer tubes 19 are connected between the two headers 18.

[0036] In heat exchanger 4A, the refrigerant flows from the upstream header 18a to the downstream header 18b. Therefore, even if a wind velocity distribution occurs in the vertical direction, the refrigerant flows through the flattened heat transfer tubes 19 that extend vertically. As a result, in heat exchanger 4A, the heat load on each of the heat transfer tubes 19 arranged in the horizontal direction is less likely to be uneven. Compared to a heat exchanger using circular heat transfer tubes that extend horizontally, the decrease in heat exchange rate due to the occurrence of a wind velocity distribution in the vertical direction can be suppressed.

[0037] Furthermore, the fins 20 of the heat exchanger 4A are corrugated fins and are arranged between the heat transfer tubes 19 that face each other.

[0038] In heat exchangers that generally use circular heat transfer tubes, when the heat transfer tubes are arranged at an inclination relative to the vertical, the airflow passes between the fins and the heat transfer tubes. Furthermore, in the case of corrugated fins, the passage of this airflow is obstructed, causing vortices (cavity vortices) to form between the leading edges of the fins, which in turn makes it easier for abnormal noises (so-called cavitation noises) to occur. Therefore, in heat exchanger 4A, which is prone to generating abnormal noises, the generation of abnormal noises can be suppressed by using a structure that has the effect of suppressing the generation of the air velocity distribution described in Embodiments 1 to 3.

[0039] In the air conditioning system 100 according to Embodiment 4, the heat exchanger 4A is provided with a pair of headers 18 facing each other, and the plurality of heat transfer tubes 19 each have a flattened shape and both ends are connected to the pair of headers 18.

[0040] According to the air conditioning system 100 of Embodiment 4, the heat exchanger 4A, which is prone to generating abnormal noise, can be made to have a structure that has the effect of suppressing the generation of wind speed distribution as described in Embodiments 1 to 3, thereby suppressing the generation of abnormal noise.

[0041] Embodiment 5. The following describes Embodiment 5, but the explanation will be omitted for parts that overlap with Embodiments 1 to 4, and the same reference numerals will be used for parts that are the same as or corresponding to Embodiments 1 to 4. Furthermore, Embodiment 5 will be described primarily for its differences from Embodiments 1 to 4.

[0042] Figure 12 is a schematic front view of the inside of the air conditioning system 100 according to Embodiment 5. Figure 13 is a schematic side view of the inside of the air conditioning system 100 according to Embodiment 5.

[0043] In Embodiment 5, in the heat exchanger 4A, a refrigerant piping connection section 21 to which the refrigerant piping is connected is provided on at least one of the two headers 18 (18a, 18b). Furthermore, the refrigerant piping connection section 21 is provided on either the discharge surface 23 side or the front surface 22 side of the header 18. In Embodiment 5, as shown in Figures 12 and 13, the refrigerant piping connection section 21 is provided on the discharge surface 23 side of the header 18a.

[0044] If the refrigerant piping connection section 21 is provided on the discharge surface 23 side of the header 18, the space required for the refrigerant piping connection section 21 in the width direction of the housing 3 becomes unnecessary, and the mounting area of ​​the heat exchanger 4A can be expanded across the width of the housing 3. Maximizing the mounting area of ​​the heat exchanger 4A within the limited space of the housing 3 is also effective in reducing airflow velocity, and by increasing the mounting area of ​​the heat exchanger 4 for the same airflow, the airflow velocity can be reduced, thereby suppressing the generation of abnormal noise.

[0045] In the air conditioning system 100 according to Embodiment 5, the heat exchanger 4A has at least one refrigerant piping connection portion 21 to which refrigerant piping is connected, and the refrigerant piping connection portion 21 is provided on at least one of a pair of headers 18 and is provided on the front surface 22 side or the outlet surface 23 side facing the exhaust port 2.

[0046] According to the air conditioning system 100 of Embodiment 5, the mounting area of ​​the heat exchanger 4A can be expanded across the width of the housing 3. Maximizing the mounting area of ​​the heat exchanger 4A within the limited space of the housing 3 is also effective in reducing airflow velocity. By increasing the mounting area of ​​the heat exchanger 4 for the same airflow, the airflow velocity can be reduced, thus suppressing the generation of abnormal noise.

[0047] Embodiment 6. The following describes Embodiment 6, but the explanation will be omitted for parts that overlap with Embodiments 1 to 5, and the same reference numerals will be used for parts that are the same as or corresponding to Embodiments 1 to 5. Furthermore, Embodiment 6 will be described primarily for its differences from Embodiments 1 to 5.

[0048] Figure 14 is a schematic front view of the inside of the air conditioning system 100 according to Embodiment 6. Figure 15 is a schematic side view of the inside of the air conditioning system 100 according to Embodiment 6.

[0049] In Embodiment 6, a drain pan 24 is provided inside the air conditioning unit 100. The drain pan 24 is positioned adjacent to the seal portion 12 of the fan casing 6 and, together with the seal portion 12 of the fan casing 6, seals the fan intake space 10 and the heat exchanger upstream space 11. By partitioning the heat exchanger upstream space 11 and the fan intake space 10 with the drain pan 24 and the seal portion 12 of the fan casing 6, the airtightness can be further enhanced.

[0050] Furthermore, by positioning the drain pan 24 in the limited available space within the housing 3 adjacent to the seal portion 12 of the fan casing 6, the mounting area of ​​the heat exchanger 4 and the size of the centrifugal fan 5 are not restricted, thus allowing for greater design flexibility. In addition, by positioning the drain pan 24 below the bottom of the heat exchanger 4, condensed water generated from the heat exchanger 4 can be efficiently collected in the drain pan 24.

[0051] As described above, the air conditioning system 100 according to Embodiment 6 includes a drain pan 24 provided in the fan intake space 10, the drain pan 24 is positioned adjacent to the seal portion 12, and together with the seal portion 12 seals the fan intake space 10 and the heat exchanger upstream space 11.

[0052] According to the air conditioning system 100 of Embodiment 6, the airtightness can be further enhanced by partitioning the upstream space 11 of the heat exchanger and the fan intake space 10 with the drain pan 24 and the seal portion 12 of the fan casing 6. Furthermore, by arranging the drain pan 24 adjacent to the seal portion 12 of the fan casing 6 in the limited available space within the housing 3, the mounting area of ​​the heat exchanger 4 and the size of the centrifugal fan 5 are not restricted, thus allowing for greater design flexibility. In addition, by arranging the drain pan 24 below the lower part of the heat exchanger 4, condensed water generated from the heat exchanger 4 can be efficiently collected in the drain pan 24.

[0053] Embodiment 7. The following describes Embodiment 7, but any aspects that overlap with Embodiments 1 to 6 will be omitted from the explanation. Furthermore, Embodiment 7 will focus on the differences from Embodiments 1 to 6.

[0054] In Embodiment 7, the fan casing 6 is made of a foam material. The type of foam material is not particularly limited.

[0055] For example, if the fan casing 6 is made of metal, material costs, mounting parts, and labor will increase, resulting in a significant increase in cost. Furthermore, metal fan casings have poor vibration damping properties due to their material properties, leading to noise generation due to vibration. On the other hand, by constructing the fan casing 6 from foam, it is possible to improve vibration damping and reduce costs because the foam fan casing 6 is lightweight, flexible, and inexpensive. In addition, because foam has sound-absorbing properties, it is effective in reducing wind noise caused by the rotation of the centrifugal fan 5. Moreover, because the fan casing 6 is lightweight and flexible, it reduces the burden on workers during assembly. Also, since the fan casing 6 is installed inside the housing 3, even if the fan casing 6 is made of foam, it can be shielded from external influences that accelerate degradation, such as ultraviolet rays. Note that at least a portion of the fan casing 6 may be made of foam, rather than the entire thing.

[0056] In the air conditioning system 100 according to Embodiment 7, the fan casing 6 is composed of at least a portion of a foamed material.

[0057] According to the air conditioning system 100 of Embodiment 7, by constructing the fan casing 6 from foam material, it is lightweight, flexible, and inexpensive, thus improving vibration damping and reducing costs. Furthermore, because foam material has sound-absorbing properties, it is also effective in reducing wind noise caused by the rotation of the centrifugal fan 5. In addition, because it is lightweight and flexible, it has the effect of reducing the burden on workers during assembly. Moreover, since the fan casing 6 is installed inside the housing 3, even though it is made of foam material, it can block external influences that accelerate degradation, such as ultraviolet rays.

[0058] Embodiment 8. The following describes Embodiment 8, but the explanation will be omitted for parts that overlap with Embodiments 1 to 7, and the same reference numerals will be used for parts that are the same as or corresponding to Embodiments 1 to 7. Furthermore, Embodiment 8 will be described primarily for its differences from Embodiments 1 to 7.

[0059] Figure 16 is a schematic front view of the inside of the air conditioning unit 100 according to Embodiment 8. Figure 17 is a schematic side view of the inside of the air conditioning unit 100 according to Embodiment 8. Figure 18 is a schematic diagram illustrating the method of attaching the fan plate 25 according to Embodiment 8 to the fan casing 6.

[0060] In Embodiment 8, as shown in Figures 16 to 18, a fan plate 25 is provided inside the air conditioning unit 100. The fan plate 25 has a rectangular plate shape with an air passage hole 26 formed in the center. The fan plate 25 is placed on top of the seal portion 12 so that the air passage hole 26 communicates with the discharge port 13 of the fan casing 6, and air is blown from the discharge port 13 through the air passage hole 26 to the upstream space 11 of the heat exchanger.

[0061] The fan plate 25 further strengthens the sealing between the heat exchanger upstream space 11 and the fan intake space 10. Its material may be the same foam material as the fan casing 6, or it may be made of plastic, and is not limited to that material.

[0062] As described above, the air conditioning device 100 according to Embodiment 8 includes a fan plate 25 arranged on top of the seal portion 12 of the fan casing 6, and the fan plate 25 has an air passage hole 26 that communicates with the discharge port 13 of the fan casing 6.

[0063] According to the air conditioning system 100 of Embodiment 8, the fan plate 25 can further strengthen the airtightness between the heat exchanger upstream space 11 and the fan intake space 10.

[0064] Although an example of an air conditioning system according to the present disclosure has been described in Embodiments 1 to 8 above, the air conditioning system according to the present disclosure is not limited to the configurations shown in Embodiments 1 to 8. For example, an air conditioning system according to the present disclosure may be constructed by combining the configurations described in different embodiments. Furthermore, although Embodiments 1 to 8 describe a floor-standing type air conditioning system as an example, the present disclosure is not limited to this and can be applied to other types of air conditioning systems, such as wall-mounted types. [Explanation of Symbols]

[0065] 1 Intake port, 2 Exhaust port, 3 Housing, 4 Heat exchanger, 4A Heat exchanger, 4a Heat transfer tube, 4b Fins, 5 Centrifugal fan, 6 Fan casing, 7 Intake port, 8 Scroll section, 9 Diffuser, 10 Fan intake space, 11 Heat exchanger upstream space, 12 Seal section, 13 Discharge port, 14 End of winding section, 15 Tongue section, 16 Beginning of winding section, 17 Rectifier member, 18 Header, 18a Header, 18b Header, 19 Heat transfer tube, 20 Fins, 21 Refrigerant piping connection section, 22 Front surface, 23 Outlet surface, 24 Drain pan, 25 Fan plate, 26 Air passage hole, 100 Air conditioning unit.

Claims

1. A housing having an air intake and an exhaust port, A centrifugal fan that draws in air from the aforementioned intake port and blows out air from the aforementioned exhaust port, A fan casing surrounds the outer circumference of the centrifugal fan and has an inlet and an outlet formed therein, The heat exchanger, located downstream of the centrifugal fan, comprises a plurality of heat transfer tubes and a plurality of fins, The aforementioned fan casing is A sealing portion is provided on the periphery of the discharge port, which divides the inside of the housing into a fan intake space where the fan casing is located and a heat exchanger upstream space where the heat exchanger is located. A scroll section that rectifies the air drawn in from the aforementioned intake port, A diffuser located at the end of the scroll section and extending to the discharge port, It has a tongue portion located at the beginning of the winding of the scroll portion, The heat exchanger is positioned at an angle such that its upper part is located on one of the front or rear sides of the housing, and its lower part is located on the other side. The area of ​​the front surface of the heat exchanger facing the discharge port is larger than the area of ​​the discharge port. The tongue portion is, The front and rear sides of the scroll section have a sloping shape in which the width of the diffuser gradually increases from the side where the lower part of the heat exchanger is located to the side where the upper part of the heat exchanger is located. Air conditioning system.

2. The rectifier member is positioned in the upstream space of the heat exchanger, from the discharge port to the heat exchanger, and is attached to at least one inner surface of the front, back, left side, and right side of the housing. The air conditioning device according to claim 1.

3. The heat exchanger is, It has a pair of headers facing each other, Each of the aforementioned heat transfer tubes has a flattened shape and both ends are connected to the pair of headers. The air conditioning device according to claim 1 or 2.

4. The heat exchanger is, It has at least one refrigerant piping connection section to which refrigerant piping is connected, The refrigerant piping connection portion is provided on at least one of the pair of headers and is located on the front side or the outlet side facing the exhaust port. The air conditioning device according to claim 3.

5. The aforementioned fan intake space is equipped with a drain pan, The drain pan is, Arranged adjacent to the aforementioned sealing portion, The aforementioned sealing portion seals the fan intake space and the heat exchanger upstream space. An air conditioning device according to claim 1 or claim 2.

6. The fan casing is composed of at least a portion of a foam material. An air conditioning device according to claim 1 or claim 2.

7. The fan casing is equipped with a fan plate that is placed on top of the sealing portion, The fan plate has an air passage hole that communicates with the discharge port of the fan casing. An air conditioning device according to claim 1 or claim 2.

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