Air conditioning system

Abstract

The present invention provides an air conditioning system. The air conditioning system comprises a compressor, the compressor comprises a rotor, the rotor has at least one rotor flow hole, the total flow cross-sectional area of ​​the at least one rotor flow hole is Sr; the compressor has at least one exhaust hole, the total flow cross-sectional area of ​​the at least one exhaust hole is S, the displacement of the compressor is V, and the rated cooling capacity of the air conditioning system is Q; wherein, k = (V*Sr) / (S*Q), k≥1.05. The air conditioning system of the present invention solves the problem of poor reliability of the compressor in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of air-conditioning equipment, and in particular to an air-conditioning system. Background Art

[0002] With the implementation of the new national energy efficiency standards for refrigeration and air conditioning, the requirements for energy efficiency and cost of compressors and air conditioning systems are getting higher and higher, and the demand for miniaturization and high speed of compressors and their corresponding air conditioning systems is becoming stronger and stronger. As the core component of the air conditioning system, variable frequency compressors have developed rapidly in recent years. Through variable frequency control, small series compressors can be operated at high speed to match large-capacity air conditioning systems.

[0003] However, when a miniaturized compressor runs at high speed, the compressor performance, oil circulation rate (OCR) (Oil Circulation Rate, which refers to the ratio of the mass flow rate of lubricating oil discharged from the compressor to the sum of the mass flow rates of the lubricating oil and refrigerant mixture when the compressor is running stably), noise and reliability are the key and difficult issues in the design, and are also common difficult issues that plague the development of the industry. Summary of the invention

[0004] The main purpose of the present invention is to provide an air conditioning system to solve the problem of poor reliability of the compressor in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides an air-conditioning system, including a compressor, the compressor including a rotor, the rotor having at least one rotor flow hole, the sum of the flow cross-sectional areas of the at least one rotor flow hole is Sr; the compressor has at least one exhaust hole, the sum of the air flow cross-sectional areas of the at least one exhaust hole is S, the displacement of the compressor is V, and the rated cooling capacity of the air-conditioning system is Q; wherein, k = (V*Sr) / (S*Q), k≥1.05.

[0006] Furthermore, k≤2.

[0007] Furthermore, 1.33≤k≤1.9.

[0008] Further, k=1.56.

[0009] Further, k=1.87.

[0010] Furthermore, the compressor is a variable frequency compressor, and the frequency of the variable frequency compressor is 10 Hz to 200 Hz.

[0011] Furthermore, the rotor has at least two rotor flow holes, and the flow cross-sectional areas of the rotor flow holes are equal.

[0012] Further, the compressor includes a cylinder assembly, and at least one exhaust hole is arranged on the cylinder assembly.

[0013] Furthermore, the cylinder assembly includes at least one cylinder, and each cylinder is provided with at least one exhaust hole.

[0014] Furthermore, the compressor has at least two exhaust holes, and the air flow cross-sectional areas of the exhaust holes are equal.

[0015] The air conditioning system of the present invention comprises a compressor, the compressor comprises a rotor, the rotor has at least one rotor flow hole, the sum of the flow cross-sectional area of ​​the at least one rotor flow hole is Sr; the compressor has at least one exhaust hole, the sum of the air flow cross-sectional area of ​​the at least one exhaust hole is S, the displacement of the compressor is V, and the rated refrigeration capacity of the air conditioning system is Q; wherein, k = (V*Sr) / (S*Q), k≥1.05. When the k value is less than 1.05, V is designed to be too small, the compressor volume is small, S will also be correspondingly small, the compressor operation frequency is too high, the maximum impact velocity of the air valve increases, and the reliability of the air valve is reduced; Sr is too small, and the compressor oil circulation rate is too high; therefore, the k value in the air conditioning system satisfies k≥1.05, which solves the problem of poor compressor performance and low reliability, and avoids the compressor oil circulation rate being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A cross-sectional view showing a compressor of an air conditioning system according to the present invention;

[0018] Figure 2 Shows Figure 1 A cross-sectional view of a first cross section of a compressor of an air conditioning system;

[0019] Figure 3 Shows Figure 1 A cross-sectional view of a compressor of an air conditioning system at a second cross section;

[0020] Figure 4 shows a schematic diagram of an air conditioning system according to the present invention;

[0021] Figure 5 It is a relationship curve between the maximum impact velocity of the air valve, the trend of the compressor oil circulation rate and the compressor cost trend and (V*Sr) / (S*Q) of the air conditioning system of the present invention.

[0022] The above drawings include the following reference numerals:

[0023] 10. compressor; 20. rotor; 21. rotor flow hole; 30. exhaust hole; 40. cylinder assembly; 50. cylinder; 60. valve;

[0024] 2. Condenser; 3. Throttling device; 4. Evaporator. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] The present invention provides an air conditioning system, please refer to Figures 1 to 5 , including a compressor 10, the compressor 10 includes a rotor 20, the rotor 20 has at least one rotor flow hole 21, and the sum of the flow cross-sectional areas of the at least one rotor flow hole 21 is Sr; the compressor 10 has at least one exhaust hole 30, and the sum of the air flow cross-sectional areas of the at least one exhaust hole 30 is S, the displacement of the compressor 10 is V, and the rated cooling capacity of the air-conditioning system is Q; wherein, k = (V*Sr) / (S*Q), k≥1.05.

[0029] The air conditioning system of the present invention comprises a compressor 10, the compressor 10 comprises a rotor 20, the rotor 20 has at least one rotor flow hole 21, the sum of the flow cross-sectional area of ​​at least one rotor flow hole 21 is Sr; the compressor 10 has at least one exhaust hole 30, the sum of the air flow cross-sectional area of ​​at least one exhaust hole 30 is S, the displacement of the compressor 10 is V, and the rated cooling capacity of the air conditioning system is Q; wherein, k = (V*Sr) / (S*Q), k≥1.05. When the k value is less than 1.05, V is designed to be too small, the compressor volume is small, S will also be correspondingly small, the compressor operating frequency is too high, the maximum impact velocity of the air valve increases, and the reliability of the air valve is reduced; Sr is too small, and the compressor oil circulation rate is too high; therefore, the k value in the air conditioning system satisfies k≥1.05, which solves the problem of poor compressor performance and low reliability, and avoids excessive compressor oil circulation rate.

[0030] Where V is in cm 3 / rev (cubic centimeters / rev), S is in mm 2 , Sr unit is mm 2 , Q unit is kw.

[0031] Among them, the displacement of the compressor is the exhaust volume of the compressor.

[0032] Specifically, the value range of Q is 2300W to 30000W.

[0033] In this embodiment, k≤2. When the k value exceeds 2, the V design is too large, the compressor volume increases, the cost increases, and the miniaturization and low-cost design requirements are not met; and at this time, the compressor oil circulation rate increases, and there is a risk of oil shortage and wear.

[0034] Optionally, 1.33≤k≤1.9. In this case, the maximum impact velocity of the gas valve is smaller, the reliability of the compressor is better, the cost is lower, and the compressor oil circulation rate is lower.

[0035] Optionally, k = 1.56. At this time, the compressor oil circulation rate is the lowest and the performance is better.

[0036] Optionally, k = 1.87. In this case, the overall performance of the compressor and the air conditioning system is good.

[0037] In this embodiment, the compressor 10 is a variable frequency compressor, and the frequency of the variable frequency compressor is 10 Hz to 200 Hz. The operating frequency of a conventional compressor is below 120 Hz, and the compressor of the present application is a high operating frequency compressor.

[0038] In this embodiment, the rotor 20 has at least two rotor flow holes 21, and the flow cross-sectional areas of the rotor flow holes 21 are equal. Such an arrangement facilitates the processing of the compressor and allows the rotor to maintain balance during operation.

[0039] In this embodiment, the compressor 10 includes a cylinder assembly 40 , and at least one exhaust hole 30 is disposed on the cylinder assembly 40 .

[0040] In this embodiment, the cylinder assembly 40 includes at least one cylinder 50 , and each cylinder 50 is provided with at least one exhaust hole 30 .

[0041] Optionally, each cylinder 50 is provided with at least two exhaust holes 30 , and the airflow cross-sectional areas of each exhaust hole 30 are not equal. Such a setting can enable the cylinder 50 to have different exhaust pressures.

[0042] In this embodiment, the compressor has at least two exhaust holes 30, and the air flow cross-sectional areas of the exhaust holes 30 are equal. Such an arrangement facilitates the processing of the compressor.

[0043] In this embodiment, the air conditioning system further includes a condenser 2 , a throttling device 3 and an evaporator 4 .

[0044] In this embodiment, the compressor further includes at least one air valve 60 , and a plurality of air valves 60 are provided in one-to-one correspondence with a plurality of exhaust holes 30 , and each air valve 60 is used to open or close a corresponding exhaust hole 30 .

[0045] Traditional compressors use large displacement and low frequency operation, while this application uses small displacement and high frequency operation. Miniaturization design has strict requirements on compressor cost. Excessive displacement will increase the volume and cost. When the compressor is running at high frequency, the design of the rotor flow hole is very important. Considering the cost and reliability of the compressor, there is a better value for the displacement, the sum of the airflow cross-sectional area of ​​the exhaust hole, and the rated cooling capacity and the rotor flow hole matching design.

[0046] This application is mainly aimed at the design innovation of the problems of poor compressor reliability, low performance, high oil circulation rate and high cost in the high-speed, miniaturized and low-cost design of compressors. For air-conditioning systems with different rated cooling capacity Q, when determining the rated cooling capacity Q of the air-conditioning system, the matching relationship between the compressor displacement V, the total flow cross-section Sr of the rotor flow holes and the total air flow cross-sectional area S of the exhaust holes is studied through high-speed and miniaturized design. The technical solution and parameter design range of this application determined by a large number of experimental tests and simulation calculations can ensure the reliability, oil circulation rate, energy efficiency and cost requirements of the compressor and air-conditioning system when running at high speed.

[0047] Specifically, when the compressor is running at high speed, if S is too small, the refrigerant exhaust flow rate will increase, the valve impact speed will increase, and the valve reliability will decrease. At the same time, the compressor lubricating oil is exhausted out of the compressor in large quantities, which greatly increases the oil circulation rate and the compressor is at risk of oil shortage and wear. In order to effectively solve the above problems and ensure that the compressor meets the oil circulation rate, reliability and cost requirements when running at high frequency, a large number of simulations and experimental tests have been conducted to find that after the rated cooling capacity Q of the air-conditioning system is determined, when the k value exceeds 2, the V design is too large, the compressor volume increases, the cost increases, and the miniaturization and low-cost design requirements are not met. The compressor oil circulation rate increases, and there is a risk of oil shortage and wear. When the k value is less than 1.05, the V design is too small, the compressor volume is small, and S will be correspondingly small. The compressor operating frequency is too high, the maximum impact speed of the valve increases, the valve reliability decreases, Sr is too small, and the compressor oil circulation rate is too high to meet the design requirements.

[0048] Specifically, Figure 5This is a relationship curve between the maximum impact velocity V1 of the compressor valve, the trend of the compressor oil circulation rate and the compressor cost trend and (V*Sr) / (S*Q) in an embodiment of the present invention. Through experimental testing and simulation analysis, it is found that when the maximum impact velocity V1 of the valve exceeds 12m / s, the valve will break after a long-term reliability test. When the compressor displacement is too small and the operating frequency is too high, the valve exhaust speed increases. After reaching a certain limit, the valve breaks and reliability problems occur. At the same time, due to the increase in exhaust flow rate, the oil circulation rate increases significantly, and there is a risk of oil shortage. According to the reliability requirements, the minimum extreme value of k is 1.05.

[0049] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0050] The air conditioning system of the present invention comprises a compressor 10, the compressor 10 comprises a rotor 20, the rotor 20 has at least one rotor flow hole 21, the sum of the flow cross-sectional area of ​​at least one rotor flow hole 21 is Sr; the compressor 10 has at least one exhaust hole 30, the sum of the air flow cross-sectional area of ​​at least one exhaust hole 30 is S, the displacement of the compressor 10 is V, and the rated cooling capacity of the air conditioning system is Q; wherein, k = (V*Sr) / (S*Q), k≥1.05. When the k value is less than 1.05, V is designed to be too small, the compressor volume is small, S will also be correspondingly small, the compressor operating frequency is too high, the maximum impact velocity of the air valve increases, and the reliability of the air valve is reduced; Sr is too small, and the compressor oil circulation rate is too high; therefore, the k value in the air conditioning system satisfies k≥1.05, which solves the problem of poor compressor performance and low reliability, and avoids excessive compressor oil circulation rate.

[0051] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0052] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: The compressor (10) comprises a rotor (20), the rotor (20) having at least one rotor circulation hole (21), the total circulation cross-sectional area of ​​the at least one rotor circulation hole (21) being Sr; the compressor (10) having at least one exhaust hole (30), the total air flow cross-sectional area of ​​the at least one exhaust hole (30) being S, the displacement of the compressor (10) being V, and the rated cooling capacity of the air conditioning system being Q; Where, k = (V*Sr) / (S*Q), 1.05≤k≤2, V is in cm 3 / rev, S unit is mm 2 , Sr unit is mm 2 , Q unit is kw; The compressor (10) comprises a cylinder assembly (40), wherein the at least one exhaust hole (30) is arranged on the cylinder assembly (40); the cylinder assembly (40) comprises at least one cylinder (50), wherein each cylinder (50) is provided with at least one exhaust hole (30).

2. The air conditioning system according to claim 1, characterized in that: 1.33≤k≤1.9。 3. The air conditioning system according to claim 2, characterized in that: k=1.56。 4. The air conditioning system according to claim 2, characterized in that: k=1.87。 5. The air conditioning system according to claim 1, characterized in that: The compressor (10) is a variable frequency compressor, and the frequency of the variable frequency compressor is 10 Hz to 200 Hz.

6. The air conditioning system according to any one of claims 1 to 5, characterized in that: The rotor (20) has at least two rotor flow holes (21), and the flow cross-sectional areas of the rotor flow holes (21) are equal.

7. The air conditioning system according to any one of claims 1 to 5, characterized in that: The compressor has at least two exhaust holes (30), and the air flow cross-sectional areas of the exhaust holes (30) are equal.

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