CN214094704U - Indoor unit of air conditioner - Google Patents

Abstract

The utility model provides an indoor unit of air conditioner belongs to air conditioning technology field. The air-conditioning indoor unit comprises a heat exchanger, a heat exchanger and a heat exchanger, wherein the heat exchanger is approximately encircled into a ring shape and is used for cooling air; the fan is arranged in the middle of the heat exchanger and used for enabling air to flow to the heat exchanger in a forced mode; the guide vane is vertically connected to the inner side of the heat exchanger, and one end, close to the fan, of the guide vane is provided with wavy teeth so as to weaken BPF sound; the heat exchanger sequentially comprises a first plane, a second plane, a third plane and a fourth plane from one end of the heat exchanger to the other end of the heat exchanger according to the rotation direction of the fan, wherein the inner side surfaces of the heat exchanger in the four directions are provided with a first flow deflector and a second flow deflector, the second plane and the third plane are respectively provided with a third flow deflector and a fourth flow deflector, and the fourth plane is not provided with the flow deflectors. The air conditioner indoor unit can reduce the number of the flow deflectors while solving the problem of noise, and has the advantages of low noise and low cost.

Description

Indoor unit of air conditioner

Technical Field

The utility model relates to an air conditioning technology field especially relates to an indoor unit of air conditioner.

Background

The air-conditioning indoor unit mostly adopts a structure that a heat exchanger surrounds a fan, and the structure can generate fin sound when the fan rotates. The fin sound is a common abnormal noise of the indoor unit of the air conditioner, and is a relatively sharp sound which appears when the distance between the fan and the fins of the indoor heat exchanger is relatively short and the rotating speed reaches a certain speed, so that the hearing sense is relatively poor. Usually, the distance between the fan and the fins of the evaporator needs to be increased or the rotating speed of the fan needs to be adjusted, and the distance between the fins of the heat exchanger needs to be increased, so that the occurrence of fin sound is avoided.

In the related technology, the mode of fixing the flow deflectors on the fins is mostly adopted, wind blowing to the fins is guided and disturbed, and fin sound is avoided. However, the addition of the guide vanes may cause other abnormal sounds, particularly BPF sounds (blade passing frequency noise).

Disclosure of Invention

The utility model discloses solve one of the technical problem in the correlation technique at least to a certain extent.

Therefore, one aspect of the present disclosure is directed to providing an air conditioning indoor unit, in which a guide vane of the air conditioning indoor unit solves a fin sound and a BPF sound is weakened, thereby better solving a noise problem.

Another aspect of the present disclosure is directed to an indoor unit of an air conditioner, which can reduce the number of guide vanes while solving the noise problem, and has the advantages of low noise and low cost.

An air conditioning indoor unit according to an aspect of the present disclosure includes: a heat exchanger substantially enclosing a loop shape for cooling air; the fan is arranged in the middle of the heat exchanger and used for enabling air to flow to the heat exchanger in a forced mode; and the flow deflector is vertically connected to the inner side of the heat exchanger, one end, close to the fan, of the flow deflector is provided with wavy teeth, two vertical ends of the teeth are provided with inclined planes, and an included angle a between each inclined plane and the vertical direction is 15-30 ℃ so as to weaken BPF sound.

According to the embodiment of the air-conditioning indoor unit, the inner side surfaces of the heat exchanger in four directions are a first plane, a second plane, a third plane and a fourth plane in sequence from one end of the heat exchanger to the other end of the heat exchanger according to the rotation direction of the fan; the first plane is provided with a first flow deflector and a second flow deflector, and the second plane, the third plane and the fourth plane are respectively provided with a third flow deflector, a fourth flow deflector and a fifth flow deflector.

According to an embodiment of the indoor unit of an air conditioner, in a cross section of the heat exchanger, a center line AA of the fan is perpendicular to the first plane, a center line BB of the fan is perpendicular to the fourth plane, the first vane is located on the center line AA, the second vane is located between the first vane and the second plane, the third vane is located between the center line BB and the third plane, the fourth vane is located between the center line AA and the fourth plane, and the fifth vane is located between the center line BB and the first plane.

An indoor unit of an air conditioner according to another aspect of the present disclosure includes: a heat exchanger substantially enclosing a loop shape for cooling air; the fan is arranged in the middle of the heat exchanger and used for enabling air to flow to the heat exchanger in a forced mode; the guide vane is vertically connected to the inner side of the heat exchanger, and one end, close to the fan, of the guide vane is provided with wavy teeth so as to weaken BPF sound; the heat exchanger sequentially comprises a first plane, a second plane, a third plane and a fourth plane from one end of the heat exchanger to the other end of the heat exchanger according to the rotation direction of the fan, wherein the inner side surfaces of the heat exchanger in the four directions are provided with a first flow deflector and a second flow deflector, the second plane and the third plane are respectively provided with a third flow deflector and a fourth flow deflector, and the fourth plane is not provided with the flow deflectors.

According to an embodiment of the indoor unit of an air conditioner, in a cross section of the heat exchanger, a center line AA of the fan is perpendicular to the first plane, a center line BB of the fan is perpendicular to the fourth plane, the first vane is located on the center line AA, the second vane is located between the first vane and the second plane, the third vane is located between the center line BB and the third plane, and the fourth vane is located between the center line AA and the fourth plane.

According to the embodiment of the air conditioning indoor unit, the distance L1 between the first guide vane and the second guide vane is 80-120 mm, the distance L2 between the third guide vane and the center line BB is 60-90 mm, and the distance L3 between the fourth guide vane and the center line AA is 50-80 mm.

According to the embodiment of the air conditioner indoor unit, the height H of the flow deflector is 8-12 mm.

According to the embodiment of the air conditioning indoor unit, the shape of the teeth is an equilateral triangle, the height a of the teeth is 1mm, the width b of the teeth is 1.5mm, and the distance c between adjacent teeth is 2 mm.

According to the embodiment of the air conditioner indoor unit, the adjacent teeth are in smooth transition.

According to the embodiment of the air-conditioning indoor unit, the lower end of the guide vane is lower than the lower end of the fan, and the height difference Y between the guide vane and the fan is 20-50 mm.

According to the embodiment of the indoor unit of the air conditioner, the claw is outwards extended from one end, close to the heat exchanger, of the flow guide plate, and the claw clamps the refrigerant pipe of the heat exchanger to be fixed.

According to the embodiment of the indoor unit of the air conditioner, the middle part of the clamping jaw is provided with the round hole matched with the refrigerant pipe and the open groove communicated with the round hole, and the minimum width of the open groove is smaller than the diameter D of the round hole.

According to the embodiment of the air conditioning indoor unit, the open groove is approximately in a V-shaped flaring shape, and the angle b of the V shape is 55-65 degrees.

Advantageous effects

According to the fan blade, the wave-shaped teeth are arranged on the flow guide plate, the energy of airflow on the flow guide plate can be disturbed by the structure of the teeth, and in addition, due to the arrangement of the outer teeth, part of the airflow passes through the teeth, so that the airflow blown to the flow guide plate by the fan is reduced, and the wind field is changed by the teeth, which is beneficial to reducing BPF sound; and set up the inclined plane that the contained angle a equals 15 ~ 30 ℃ at the both ends of tooth, can increase the distance that the air current blows to the guide vane slightly to can not weaken the effect of eliminating the fin sound when further reducing the BPF sound.

According to the present disclosure, the guide vanes are not disposed on the fourth plane, so that the noise improvement effect is not affected, and the cost is reduced by reducing the number of the guide vanes.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a view of a fan and a heat exchanger of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

fig. 2 is a view of a general guide vane in the related art;

fig. 3 is a view of a guide vane of an air conditioning indoor unit according to an embodiment of the present disclosure;

fig. 4 is a side view of a guide vane of an air conditioning indoor unit according to an embodiment of the present disclosure;

FIG. 5 is an enlarged view taken along line X in FIG. 4;

fig. 6 is a plan view of a fan and a heat exchanger of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

fig. 7 is a plan view of a fan and a heat exchanger of an indoor unit of an air conditioner according to another embodiment of the present disclosure;

fig. 8 is a side view of a fan and a heat exchanger of an indoor unit of an air conditioner according to an embodiment of the present disclosure;

in the above figures: 1. a fan; 2. a heat exchanger; 21. a first plane; 22. a second plane; 23. a third plane; 24. a fourth plane; 3. a flow deflector; 31. teeth; 32. a bevel; 33. a first guide vane; 34. a second guide vane; 35. a third guide vane; 36. a fourth guide vane; 37. a fifth guide vane; 38. a claw; 381. a circular hole; 382. grooving; 4. and (4) common flow deflectors.

Detailed Description

The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, an air conditioning indoor unit according to an embodiment of the present disclosure includes a fan 1 and a heat exchanger 2, where the heat exchanger 2 is substantially in a ring shape and is disposed around the fan 1, the fan 1 forcibly flows air to the heat exchanger 2, and the air exchanges heat with the heat exchanger 2 and is blown out as cold air.

The fan 1 is a centrifugal fan, and the heat exchanger 1 is provided with a refrigerant pipe and a fin penetrating through the refrigerant pipe.

When the distance between the fan 1 and the fins of the heat exchanger 1 is short and the rotating speed reaches a certain speed, a relatively sharp fin sound can appear.

In order to reduce the fin noise in the related art, a guide vane is usually arranged on the inner side of the heat exchanger 1, and this guide vane can guide and disturb the wind blowing on the fin to avoid the noise effect of the fin noise, but the increase of the guide vane 4 can cause the increase of the BPF noise.

Table 1 shows the BPF sound test data of the indoor unit of the air conditioner without the vane and with the ordinary vane 4, and the comparison of the values in table 1 shows that: the air conditioner indoor unit provided with the common guide vane 4 increases the BPF sound ratio caused by low and medium wind speed. To distinguish from the guide vane of the present disclosure, the guide vane in the related art is described as a general guide vane 4, and the structure of the general guide vane 4 refers to fig. 2.

TABLE 1

The noise of centrifugal fans is mainly aerodynamic noise, wherein the dominant one is dipole noise caused by pulsating pressure of airflow acting on blades and volute, and it is composed of discrete noise of Blade Passing Frequency (BPF) and broadband noise caused by vortex and turbulent flow. The BPF noise is the main noise source of the centrifugal fan, and is caused by the fact that high-speed airflow flowing out of the blades impacts the volute tongue of the volute and generates large pulsating pressure on the blades and the volute tongue, and the noise frequency is the product of the number of the blades of the fan and the rotating speed. The guide vane is similar to a volute tongue, so that BPF sound is generated when airflow passes through the guide vane.

This disclose for the problem that solves the water conservancy diversion piece and make the BPF sound increase, optimize the structure of water conservancy diversion piece:

referring to fig. 3 and 4, the deflector 3 according to the embodiment of the present disclosure is provided with a wavy tooth 31 at one end thereof close to the heat exchanger 2, the tooth 31 is configured to disturb the energy of the airflow on the deflector 3, and in addition, the tooth 31 is configured to allow a portion of the airflow to pass through the tooth, thereby reducing the airflow blown by the fan 1 to the deflector 3, and the tooth 31 also changes the wind field, which is beneficial to reducing BPF noise.

Specifically, referring to fig. 5, the teeth 31 are shaped like an equilateral triangle, the tooth profile height a is 1mm, the width b is 1.5mm, and the distance c between two adjacent teeth 31 is 2 mm. The adjacent teeth are in smooth transition connection, so that the phenomenon that air flow blows on a sharp surface to increase noise can be avoided.

Table 2 shows the BPF sound test data for the air conditioner indoor unit without the vane, with the common vane 4 and the tooth-shaped vane, as shown in table 2: the BPF sound caused by the tooth-shaped flow deflector is basically smaller than the noise caused by the common flow deflector 4 and is equivalent to the BPF sound without the flow deflector. Therefore, the air conditioning indoor unit of the present disclosure can reduce the BPF sound while improving the fin sound because the teeth 31 are provided on the guide vane 3.

TABLE 2

With continued reference to fig. 4, the larger the transverse height H of the guide vane 3, that is, the closer the guide vane 3 is to the fan 1, the more significant the improvement of the fin sound is, but the larger the resulting BPF sound is, whereas the smaller the H value is, the poorer the improvement effect of the guide vane 3 on the fin sound is, and the smaller the resulting BPF sound is.

In order to give consideration to the optimal effect of reducing the fin sound and the BPF sound, the present disclosure performs a comparative test on the guide vanes 3 with different heights H (8mm, 10mm, 12mm, 14mm, 16mm), and finds that the effect of reducing the fin sound and the BPF sound is better when H is 8-12 mm, and particularly, the effect is optimal when H is 10 mm.

In some embodiments of the present disclosure, the guide vane 3 is provided with the inclined plane 32 at the two ends of the tooth 31, the inclined plane 32 makes the two ends of the guide vane 3 be sharp, the two ends of the guide vane 3 are sharper, that is, the vertical included angle a between the inclined plane 32 and the guide vane 3 is smaller, the distance that the air flow blows to the guide vane 3 can be increased, so that the BPF sound is reduced, but the effect of eliminating the fin sound is affected, and the larger a is, the more favorable the elimination of the fin sound is, but the decrease of the BPF sound is not facilitated, therefore, in the present disclosure, the angle a is set to 15-30 °, the distance that the air flow blows to the guide vane 3 can be slightly increased by the inclined plane 32, so that the effect of eliminating the fin sound is not weakened while the BPF sound is further reduced.

In some embodiments, referring to fig. 6, arrows indicate the rotation direction of the fan, and the inner side surfaces of the heat exchanger 2 in four directions are a first plane 21, a second plane 22, a third plane 23 and a fourth plane 24 in sequence from one end of the heat exchanger 2 to the other end thereof according to the rotation direction of the fan 1; the number of the guide vanes 3 on the heat exchanger 2 is 5, which are respectively a first guide vane 33 and a second guide vane 34 on the first plane 21, a third guide vane 35 on the second plane 22, a fourth guide vane 36 on the third plane 23, and a fifth guide vane 37 on the fourth plane 24. Because the fin sound is generated at the position where the fan 1 is close to the fins, the five guide vanes 3 are arranged close to the middle parts of the four planes, and thus the effect of the air-conditioning indoor unit on eliminating the fin sound on the whole can be effectively improved.

Specifically, in the cross section of the heat exchanger 2, a center line AA of the fan 1 is perpendicular to the first plane 21, a center line BB of the fan 1 is perpendicular to the fourth plane 24, the first vane 33 is located on the center line AA, the second vane 34 is located between the first vane 33 and the second plane 22, the third vane 35 is located between the center line BB and the third plane 23, the fourth vane 36 is located between the center line AA and the fourth plane 24, and the fifth vane 37 is located between the center line BB and the first plane 21. The distribution can effectively improve the effect of weakening fin sound and BPF sound of the whole air conditioner indoor unit.

It is generally accepted by those skilled in the art that: when the fan 1 rotates, the airflow generates fin sounds on four planes, however, the inventor of the present disclosure finds that the fin sounds are not increased when the fifth guide vane 37 is removed, and the indoor unit of the air conditioner can still maintain a good noise elimination effect.

Therefore, in another embodiment of the present disclosure, different from the above embodiment, referring to fig. 7, four baffles 3 are distributed on the heat exchanger 2, which are the first baffle 33 and the second baffle 34 disposed on the first plane 21, the third baffle 35 disposed on the second plane 22, the fourth baffle 36 disposed on the third plane 23, and the fourth plane 24 is not provided with the baffles 3, so that the noise improvement effect is not affected, and the cost is reduced due to the reduction of the number of the baffles 3.

The positions of the four guide vanes 3 are further optimized, so that the noise elimination effect is better, specifically, the distance L1 between the first guide vane 33 and the second guide vane 34 is 80-120 mm, the distance L2 between the third guide vane 35 and the center line BB is 60-90 mm, and the distance L3 between the fourth guide vane 36 and the center line AA is 50-80 mm.

Referring to fig. 8, since the bottom airflow velocity of the fan 1 is the highest, the lower end of the baffle 3 is lower than the lower end of the fan 1, and the height difference Y is 20-50 mm, so that the effect of eliminating fin sound by the baffle 3 can be avoided, and the BPF sound can be weakened by the lower end of the baffle 3 being the inclined plane 32.

With reference to fig. 4, three claws 38 extend outwards from one end of the baffle 3 close to the heat exchanger 2, one of the claws 38 is located in the middle of the baffle 3, and the other two claws 38 are located at two ends of the baffle 3, and the claws 38 clamp the refrigerant pipe on the heat exchanger 2, so that the baffle 3 is fixedly connected to the heat exchanger 2. The distribution form of the three claws 38 can ensure the reliability of connection, and avoid the problem that the guide vane 3 is not firmly connected when the airflow acts on the guide vane 3.

The middle part of the clamping jaw 38 is provided with a round hole 381, and the round hole 381 is matched with the refrigerant pipe and clamped on the periphery of the refrigerant pipe in an assembling state.

The circular hole 381 is provided with a notch 382, the notch 382 is approximately in a V-shaped flaring shape, the included angle b of the V shape is 55-65 ℃, a guiding effect can be achieved, and the notch 382 of the clamping jaw 38 is aligned with the refrigerant pipe to be inserted during assembly, so that the flow deflector 3 can be installed.

In addition, the width L of the connection part of the slot 382 and the circular hole 381 is the smallest, and the width L is slightly smaller than the diameter D of the circular hole 381, so that the guide vane 3 can be conveniently installed, and the guide vane 3 can be prevented from being separated from the refrigerant pipe.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. An indoor unit of an air conditioner, comprising:

a heat exchanger substantially enclosing a loop shape for cooling air;

the fan is arranged in the middle of the heat exchanger and used for enabling air to flow to the heat exchanger in a forced mode; and

the guide vane is vertically connected to the inner side of the heat exchanger, and one end, close to the fan, of the guide vane is provided with wavy teeth so as to weaken BPF sound;

the heat exchanger sequentially comprises a first plane, a second plane, a third plane and a fourth plane from one end of the heat exchanger to the other end of the heat exchanger according to the rotation direction of the fan, wherein the inner side surfaces of the heat exchanger in the four directions are provided with a first flow deflector and a second flow deflector, the second plane and the third plane are respectively provided with a third flow deflector and a fourth flow deflector, and the fourth plane is not provided with the flow deflectors.

2. The indoor unit of claim 1, wherein, in a cross-section of the heat exchanger, a center line AA of the fan is perpendicular to the first plane, a center line BB of the fan is perpendicular to the fourth plane, the first vane is located on the center line AA, the second vane is located between the first vane and the second plane, the third vane is located between the center line BB and the third plane, and the fourth vane is located between the center line AA and the fourth plane.

3. The indoor unit of claim 2, wherein a distance L1 between the first vane and the second vane is 80-120 mm, a distance L2 between the third vane and the center line BB is 60-90 mm, and a distance L3 between the fourth vane and the center line AA is 50-80 mm.

4. An indoor unit of an air conditioner according to claim 1, wherein the lower end of the guide vane is lower than the lower end of the fan, and a height difference H between the lower end of the guide vane and the lower end of the fan is 20 to 50 mm.

5. An indoor unit of an air conditioner according to claim 1, wherein the height H of the baffle in the lateral direction is 8-12 mm.

6. An indoor unit of an air conditioner according to claim 1, wherein the shape of the tooth is an equilateral triangle, the height a of the tooth is 1mm, the width b of the tooth is 1.5mm, and the distance c between adjacent teeth is 2 mm.

7. An indoor unit of an air conditioner according to claim 1, wherein adjacent teeth are rounded.

8. An indoor unit of an air conditioner as claimed in claim 1, wherein a jaw extends outwards from one end of the guide vane close to the heat exchanger, and the jaw clamps and fixes a refrigerant pipe of the heat exchanger.

9. An indoor unit of an air conditioner according to claim 8, wherein a circular hole adapted to the refrigerant pipe and a slot communicating with the circular hole are formed in the middle of the claw, and the minimum width of the slot is smaller than the diameter D of the circular hole.

10. An indoor unit of an air conditioner according to claim 9, wherein the groove has a substantially V-shaped flared shape, and an angle b of the V-shape is 55 to 65 °.

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