Outdoor unit of air conditioner

Abstract

The present invention provides an outdoor air conditioner, comprising: a housing; a heat exchanger disposed within the housing; a gas supply pipeline, one end of which is connected to the heat exchanger; a compressor disposed within the housing, with a gas supply port provided at the top of the compressor; a buffer disposed above the compressor, the buffer comprising: a buffer body within which a buffer chamber is formed, an air inlet formed at an end of the buffer body, and an air outlet formed on a side wall of the buffer body, the air inlet being connected to the other end of the gas supply pipeline; an air outlet pipe, both ends of which are respectively connected to the air outlet and the gas supply port, and the air outlet pipe being a straight pipe; by providing the air outlet pipe as a straight pipe, the distance between the buffer and the gas supply port can be shortened, the noise problem caused by air flow pulsation can be further reduced, the problems of pipe vibration and stress caused by an inappropriate pipe shape of the air outlet pipe can be eliminated, and the noise can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to an outdoor unit of an air conditioner. Background Art

[0002] With the increasing improvement of people's living standards, air conditioners have increasingly become one of the essential electrical appliances in people's lives. In recent years, the competition in the air conditioner industry has become increasingly fierce. The noise level has become a highlight in the publicity of major brands, and noise complaints have become the complaint points of NPS (Net Promoter Score), among which the abnormal noise of the outdoor unit accounts for a relatively large proportion. Compared with ordinary compressors, the overall noise of the gas-injected enhanced enthalpy compressor is higher, and the gas injection pipeline is the main contributor. In the past, the gas injection pipeline was mainly fixed (such as using sheet metal parts, rubber pads, etc.) to achieve the purpose of vibration reduction and noise reduction, but the effect was poor. Moreover, there are many parts in the outdoor unit, the available space for pipeline design is small, and there are many constraints. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end,

[0004] According to an embodiment of the present disclosure, an outdoor unit of an air conditioner is provided, including:

[0005] A housing;

[0006] A heat exchanger, disposed inside the housing;

[0007] A gas injection pipeline, one end of which is connected to the heat exchanger;

[0008] A compressor, disposed inside the housing, and a gas injection port is provided at the top of the compressor;

[0009] A buffer, disposed above the compressor, and the buffer includes:

[0010] A buffer body, a buffer cavity is formed therein, an air inlet is formed at the end of the buffer body, an air outlet is formed on the side wall of the buffer body, and the air inlet is connected to the other end of the gas injection pipeline;

[0011] An air outlet pipe, both ends of which are respectively connected to the air outlet and the gas injection port, and the air outlet pipe is a straight pipe.

[0012] By setting the air outlet pipe as a straight pipe, the distance between the buffer and the gas injection port can be shortened, the noise problem caused by air flow pulsation can be further reduced, the problems of pipe vibration and stress caused by inappropriate pipe shape of the air outlet pipe can be eliminated, and the noise can be reduced.

[0013] According to an embodiment of the present disclosure, the buffer body is horizontally disposed, and the straight pipe is vertically disposed, which can improve the noise reduction effect.

[0014] According to an embodiment of the present disclosure, the buffer body is made of cold-rolled steel SPCC, which can significantly reduce the volume and weight of the buffer, and solve the problems of small design space and difficult buffer arrangement.

[0015] According to an embodiment of the present disclosure, the outer diameter of the buffer is 38.1 mm, and the length of the buffer is 94 mm, which can make the natural frequency of the buffer avoid the resonance point frequency of the compressor and reduce the resonance between the buffer and the compressor.

[0016] According to an embodiment of the present disclosure, the straight pipe is made of semi-rigid phosphor-deoxidized copper.

[0017] According to an embodiment of the present disclosure, the wall thickness of the buffer is 1.2 - 2 mm.

[0018] According to an embodiment of the present disclosure, the straight pipe is welded to the buffer body.

[0019] According to an embodiment of the present disclosure, the buffer further includes an air inlet pipe, and both ends of the air inlet pipe are respectively connected to the supplementary air pipe and the air inlet.

[0020] According to an embodiment of the present disclosure, the air inlet pipe is made of semi-rigid phosphor-deoxidized copper.

[0021] According to an embodiment of the present disclosure, the supplementary air pipe includes a first pipe and a second pipe. The second pipe is connected to the heat exchanger, the first pipe is connected to the air inlet pipe, and the first pipe is in a U shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 is a schematic structural diagram of a partial structure of an outdoor unit of an air conditioner according to an embodiment of the present disclosure;

[0024] Figure 2 is a schematic structural diagram of a buffer according to an embodiment of the present disclosure;

[0025] Figure 3 is a minimum wall thickness diagram of a buffer according to an embodiment of the present disclosure;

[0026] Figure 4 is a mass diagram of a buffer according to an embodiment of the present disclosure;

[0027] Figure 5It is a vibration acceleration test data graph of a buffer according to an embodiment of the present disclosure;

[0028] Figure 6 It is a natural frequency graph of different schemes of a buffer according to an embodiment of the present disclosure.

[0029] In each of the above figures: heat exchanger 2; compressor 3; gas supplement port 31; gas supplement pipeline 4; first pipeline 41; second pipeline 42; buffer 5; buffer body 51; air inlet 511; air outlet 512; air inlet pipe 52; air outlet pipe 6. Specific Embodiments

[0030] Hereinafter, the present invention will be specifically described by way of exemplary embodiments. However, it should be understood that, without further recitation, elements, structures, and features in one embodiment may also be beneficially incorporated into other embodiments.

[0031] In the present application, an air conditioner performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0032] The compressor compresses the refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0033] The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant to perform heat exchange with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0034] The air conditioner includes an indoor unit and an outdoor unit of the air conditioner. The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes an indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0035] The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger serves as a condenser, the air conditioner serves as a heater in the heating mode. When the indoor heat exchanger serves as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0036] Next, refer to Figure 1-6 Describe the outdoor unit of the air conditioner according to an embodiment of the present invention, Figure 1 and Figure 2Schematic diagram of the partial structure of an outdoor unit of an air conditioner.

[0037] The present invention provides an outdoor unit of an air conditioner, which includes a housing, and an installation cavity is formed inside the housing.

[0038] Reference Figure 1 , the outdoor unit of the air conditioner further includes a heat exchanger 2, the heat exchanger 2 is arranged inside the housing, the heat exchanger 2 can be a plate heat exchanger, and a refrigerant outlet is provided on the heat exchanger 2.

[0039] The outdoor unit of the air conditioner further includes a compressor 3, the compressor 3 is arranged inside the housing, a gas supplement port 31 is provided at the top of the compressor 3, and the compressor 3 is a scroll gas-supplemented and enthalpy-increased compressor.

[0040] The outdoor unit of the air conditioner further includes a gas supplement pipeline 4, both ends of the gas supplement pipeline 4 are respectively communicated with the heat exchanger 2 and the gas supplement port 31 of the compressor. Because the gas supplement port 31 is connected to the middle pressure area of the compressor scroll plate, the pulsation of the gas supplement air flow in the gas supplement pipeline 4 becomes an important source of noise of the outdoor unit of the air conditioner.

[0041] Therefore, reference Figure 1 , a buffer 5 is arranged in the outdoor unit of the air conditioner, the buffer 5 is arranged above the compressor 3, reference Figure 2 , the buffer 5 includes a buffer body 51, a buffer cavity is formed inside the buffer body 51, the volume inside the buffer cavity is generally about 10 times the exhaust volume of the compressor, and an air inlet 511 located at the end of the buffer body and an air outlet 512 located on the side wall of the buffer body are further formed on the buffer body 51.

[0042] An air outlet pipe 6 is connected to the air outlet 512, one end of the air outlet pipe 6 is connected to the air outlet, and the other end is connected to the gas supplement port, so that the buffer is connected to the compressor. The air outlet pipe 6 can be a straight pipe or a bent pipe. When the pipe is a straight pipe, the distance between the buffer and the gas supplement port can be shortened, the noise problem caused by air flow pulsation can be further reduced, the problems of pipe vibration and stress caused by inappropriate pipe shape of the air outlet pipe can be eliminated, and the noise can be reduced. Specifically, the buffer body can be set horizontally and the straight pipe can be set vertically, so as to shorten the length of the straight pipe as much as possible and reduce the noise. The straight pipe and the buffer body are connected by welding, and the length of the straight pipe is shortened to only meet the welding requirements.

[0043] An air inlet pipe 52 is provided at the air inlet 511, both ends of the air inlet pipe are respectively connected to the gas supplement pipeline 4 and the air inlet 511, so that the air flow in the supplement air pipeline flows into the buffer cavity, and the air inlet pipe and the buffer body can be connected by welding.

[0044] The gas supplement pipeline 4 includes a first pipeline 41 and a second pipeline 42, the second pipeline 42 is connected to the heat exchanger 2, the first pipeline 41 is connected to the air inlet pipe 52, and the first pipeline 41 is U-shaped.

[0045] The material of the buffer can be semi-rigid phosphorus-deoxidized copper (TP2Y2), soft phosphorus-deoxidized copper (TP2M), carbon steel (08AL), and cold-rolled steel (SPCC). The minimum wall thickness of the buffer body can be determined by the following method:

[0046]

[0047] Where: t is the minimum wall thickness of the pipe (mm); R is the center line curvature radius of the pipe (mm); P is the design pressure (MPa); D0 is the outer diameter of the pipe (mm); σ a is the allowable stress of the material (N / mm 2 ), and η is the welding coefficient, where η = 1.

[0048] Figure 3 is the minimum wall thickness diagram of the buffer under different materials and working conditions. Refer to Figure 3 , when the material of the buffer body is semi-rigid phosphorus-deoxidized copper (TP2Y2), when the wall thickness of the buffer body is 2.0 mm, it meets the minimum wall thickness requirements under the design pressures of 4.15 MPa and 3.21 MPa. However, the welding method used for the buffer body and the piping results in a reduction in the strength of the buffer body, and the problem of buffer body rupture occurred during the experiment, not meeting the requirements of the burst pressure test. Considering the theoretical calculation results and experimental results comprehensively, the wall thickness of the buffer body is designed to be 2.5 mm. After the experiment, the experiment passed, but the deformation at the welding joint of the buffer piping is relatively large and the strength is reduced. Because the semi-rigid phosphorus-deoxidized copper (TP2Y2) has low strength, it is necessary to increase the wall thickness to improve the reliability of the buffer to meet the requirements of the whole machine. According to Figure 3 , under the same pipe diameter, the minimum wall thickness of the buffer using SPCC material is smaller. Therefore, a buffer with a wall thickness of 1.2 mm and a material of SPCC is used for relevant experiments. It can be seen from the experimental results that the reliability of the SPCC material buffer meets the requirements of the whole machine. The wall thickness of the SPCC material buffer is 1.2 mm, without considering the corrosion allowance. When the wall thickness of the SPCC material buffer is selected to be 2.0 thickness, it more meets the reliability requirements of the whole machine. Therefore, the wall thickness of the buffer cavity of the SPCC material can be 1.2 - 2 mm. Therefore, the material of the buffer body can be selected as SPCC. Under the condition of the same buffer cavity volume, the volume and weight of the buffer body can be reduced, the space occupied by the buffer can be reduced, and the problems of small design space and difficult buffer layout are solved. Since the straight pipe and the intake pipe are welded to the buffer body, the material of the straight pipe and the intake pipe is selected as semi-rigid phosphorus-deoxidized copper (TP2Y2), which can improve the welding effect. The density of semi-rigid phosphorus-deoxidized copper (TP2Y2) is 8930 Kg / m 3 , and the density of SPCC is 7850 Kg / m 3 , the above three buffers are weighed and recorded, and the results are as Figure 4as shown

[0049] During the compressor sweep frequency process in the noise experiment, when the compressor runs at 80 HZ and above, the listening experience is poor, which is caused by the violent vibration of the buffer. When the compressor operating frequencies are 80 HZ, 85 HZ, and 90 HZ, refer to Figure 2 , conduct vibration acceleration g tests on three positions A, B, and C of the buffer, and the data is as Figure 5 shown

[0050] Judging from the test data, the vibration is large at 80 HZ, indicating that when the compressor runs at 80 HZ, the resonance between the buffer and the compressor is the largest, exceeding the maximum limit of the overall machine reliability requirements. Therefore, it is necessary to optimize the buffer to improve its natural frequency and avoid the frequency range where the noise and stress of the compressor are unqualified during operation.

[0051] The operating frequency range of the compressor is 31 - 95 HZ, and 80 HZ is relatively close to the upper limit. Therefore, it is easier to increase the natural frequency of the buffer. It can be seen from the natural frequency calculation formula that increasing the stiffness of the buffer and reducing the mass of the buffer can both increase its natural frequency.

[0052] Natural frequency calculation formula:

[0053] Among them, f is the natural frequency, k is the stiffness coefficient of the object, with the unit of N / m, and m is the mass of the object, with the unit of Kg.

[0054] Designed multiple schemes to analyze the data, and the better scheme is shown in Figure 6 , among which, when the material of the buffer body is SPCC, the outer diameter of the tube is 38.1 mm, and the length is 94 mm, the natural frequency of the buffer can avoid the resonance point frequency of the compressor and reduce the resonance between the buffer and the compressor.

[0055] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0056] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0057] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] As mentioned above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An outdoor unit of an air conditioner, characterized in that, Comprising: A housing; A heat exchanger, disposed within the housing; A gas supply pipe, one end of which is connected to the heat exchanger; A compressor, disposed within the housing, and having a gas supply port at the top thereof; The compressor is an enthalpy-increasing compressor with gas supply; A buffer, disposed above the compressor, and the buffer comprises: A buffer body, within which a buffer chamber is formed, an air inlet is formed at an end of the buffer body, an air outlet is formed on a side wall of the buffer body, and the air inlet is connected to the other end of the gas supply pipe; the buffer body is horizontally disposed; An air outlet pipe, both ends of which are respectively connected to the air outlet and the gas supply port, and the air outlet pipe is a straight pipe; the straight pipe is vertically disposed; An air inlet pipe, both ends of which are respectively connected to the gas supply pipe and the air inlet; The buffer body is made of cold-rolled steel SPCC, and the formula for determining the minimum wall thickness of the buffer body is as follows: Where: t is the minimum wall thickness of the pipe (mm); R is the center line curvature radius of the pipe (mm); P is the design pressure (MPa); D0 is the outer diameter of the pipe (mm); σ a is the allowable stress of the material (N / mm 2 ), η is the welding coefficient, and here η = 1.

2. The air conditioner outdoor unit according to claim 1, wherein, The outer diameter of the buffer is 38.1 mm, and the length of the buffer is 94 mm.

3. The air conditioner outdoor unit according to claim 1, characterized in that, The straight pipe is made of semi-rigid phosphor-deoxidized copper.

4. The air conditioner outdoor unit according to claim 1, characterized in that, The wall thickness of the buffer is 1.2 - 2 mm.

5. The air conditioner outdoor unit according to claim 1, characterized in that, The straight pipe is welded to the buffer body.

6. The air conditioner outdoor unit according to claim 1, characterized in that, The air inlet pipe is made of semi-rigid phosphor-deoxidized copper.

7. The air conditioner outdoor unit according to claim 6, characterized in that, The gas supply pipe comprises a first pipe and a second pipe, the second pipe is connected to the heat exchanger, the first pipe is connected to the air inlet pipe, and the first pipe is in a U shape.

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