Liquid accumulator, rotary compressor and air conditioning system

Abstract

The invention provides a liquid storage device, a rotary compressor and an air conditioning system. The liquid storage device comprises a barrel, a liquid storage tank and a liquid storage tank, an air outlet pipe is arranged at the other end of the barrel; the inner pipe is arranged in the cylinder body, the inner pipe is connected with the air outlet pipe, and an upper oil return hole and a lower oil return hole are formed in the side, close to the air outlet pipe, of the inner pipe; the size of the upper oil return hole is larger than that of the lower oil return hole. The inner pipe of the liquid accumulator is provided with the upper oil return hole and the lower oil return hole, the size of the upper oil return hole is larger than that of the lower oil return hole, and the sizes and positions of the upper oil return hole and the lower oil return hole are optimized and adjusted, so that normal oil return of the liquid accumulator under the conventional working condition can be guaranteed, and the liquid accumulator can adapt to accumulated liquid of the liquid accumulator when the oil level is located on the upper portion of the accumulated liquid. And the lubricating oil can timely return to the compressor through the upper oil return hole to ensure that the compressor is not lack of oil, so that the operation stability and the service life of the compressor and an air-conditioning system using the compressor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more particularly, to a liquid accumulator, a rotary compressor, and an air conditioning system. Background Art

[0002] In some existing low superheat conditions, liquid will accumulate in the liquid accumulator of the compressor for a period of time at the start. The oil returns to the compressor through an oil return hole provided near the bottom of the inner tube of the liquid accumulator. For some partially miscible refrigerant and lubricant combinations with a greater refrigerant density, when starting or in non-steady states such as defrosting, a large amount of liquid refrigerant returns from the system and accumulates in the liquid accumulator. When the lubricating oil returns to the liquid accumulator from the system, the lubricating oil and the refrigerant are stratified, and the oil is mainly located in the upper part of the accumulated liquid to form an oil-rich area, while the lower part is still a poor oil area with very little oil content. At this time, the main substance returning to the compressor through the oil return hole is liquid refrigerant or refrigerant with very little oil content.

[0003] At the same time, when the compressor is in a cold start or defrosting condition with a low superheat, due to the volatilization of the refrigerant and a high oil circulation rate (OCR), the oil level in the oil sump of the compressor will drop sharply. At this time, if the oil cannot return to the oil sump of the compressor in time, and a large amount of liquid refrigerant returns to the compressor through the oil return hole, the oil dilution rate in the compressor increases, and the oil viscosity decreases significantly, resulting in reliability problems of the compressor due to short-term lack of oil.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present invention, and thus may include information that does not constitute the prior art known to those skilled in the art. Summary of the Invention

[0005] Aiming at the problems in the prior art, the purpose of the present invention is to provide a liquid accumulator, a rotary compressor, and an air conditioning system

[0006] The first aspect of the present invention provides a liquid accumulator, comprising:

[0007] A cylinder body, an intake pipe is provided at one end of the cylinder body; an exhaust pipe is provided at the other end of the cylinder body;

[0008] An inner tube, disposed inside the cylinder body, the inner tube is connected to the exhaust pipe and upper and lower oil return holes are provided on a side thereof close to the exhaust pipe;

[0009] The size of the upper oil return hole is larger than the size of the lower oil return hole.

[0010] According to the first aspect of the present invention, the equivalent diameter of the upper oil return hole is d1, and the equivalent diameter of the lower oil return hole is d2, satisfying:

[0011] 1.1d2 ≤ d1 ≤ 1.8d2.

[0012] According to the first aspect of the present invention, the distance between the upper oil return hole and the bottom of the liquid storage device is h1, and the distance between the lower oil return hole and the bottom of the liquid storage device is h2;

[0013] The height of the inner tube is h0, satisfying:

[0014] 2h2 ≤ h1 ≤ 2 / 3h0.

[0015] According to the first aspect of the present invention, the distance between the upper oil return hole and the bottom of the liquid storage device is h1, satisfying: 19 mm ≤ h1 ≤ 46 mm.

[0016] According to the first aspect of the present invention, the cross-section of the upper oil return hole is circular, elliptical or polygonal; and / or

[0017] The cross-section of the upper oil return hole is circular, elliptical or polygonal.

[0018] The second aspect of the present invention provides a rotary compressor, including a compressor body and the liquid storage device described above.

[0019] According to the second aspect of the present invention, the compressor body further includes a pump body assembly;

[0020] The pump body assembly includes at least one cylinder;

[0021] The at least one cylinder is connected to the air outlet pipe.

[0022] The third aspect of the present invention provides an air conditioning system, including the rotary compressor described above.

[0023] According to the third aspect of the present invention, the lubricating oil used in the air conditioning system is partially miscible with the refrigerant used, the lubricating oil dissolves in the liquid refrigerant and forms an oil-poor area and an oil-rich area, and the minimum solubility of the lubricating oil in the oil-rich area in the liquid refrigerant is S;

[0024] The equivalent diameter of the upper oil return hole is d1, and the equivalent diameter of the lower oil return hole is d2, satisfying:

[0025] d2 < d1 ≤ d2 / S.

[0026] According to the third aspect of the present invention, the refrigerant is R410A or R32.

[0027] The inner tube of the liquid reservoir of the present invention is provided with an upper oil return hole and a lower oil return hole, and the size of the upper oil return hole is larger than that of the lower oil return hole. By optimizing and adjusting the size and position of the upper oil return hole and the lower oil return hole, it can not only ensure the normal oil return of the liquid reservoir under normal working conditions, but also adapt to the situation where the liquid reservoir accumulates liquid and the oil level is above the accumulated liquid. The lubricating oil can timely return to the compressor through the upper oil return hole, ensuring that the compressor does not lack oil, thereby improving the operating stability and service life of the compressor and the air conditioning system using the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings herein are incorporated into and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objects, and advantages of the present invention will become more apparent. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0029] Figure 1 is a schematic structural diagram of the liquid reservoir according to an embodiment of the present invention; and

[0030] Figure 2 and Figure 3 are respectively schematic structural diagrams of the upper oil return hole and the lower oil return hole of the liquid reservoir according to different embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0032] In the descriptions of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc., mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of this specification. Moreover, the specific features, structures, materials, or characteristics represented can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in this specification and the features of different embodiments or examples.

[0033] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" with other elements placed therebetween. The relative space terms such as "front", "rear", "upper", "lower", etc. can be used to more easily explain the relationship of one device relative to another device illustrated in the drawings. Such terms refer to not only the meaning indicated in the drawings, but also other meanings or operations of the device in use. For example, if the device in the drawing is flipped, a device that was described as "below" another device would then be described as "above" another device. Therefore, the exemplary term "below" includes both above and below. The device can be rotated 90° or other angles, and the relative space terms are also interpreted accordingly.

[0034] Although in some instances the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first interface and the second interface, etc. are indicated. Furthermore, as used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context indicates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the stated features, steps, operations, elements, components, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0035] In view of the existing technical problems, the present invention provides a liquid reservoir, a rotary compressor and an air-conditioning system. The liquid reservoir includes: a cylinder body, an air inlet pipe is arranged at one end of the cylinder body; an air outlet pipe is arranged at the other end of the cylinder body; an inner pipe is arranged inside the cylinder body, and an upper oil return hole and a lower oil return hole are arranged on one side of the inner pipe close to the air outlet pipe; and the size of the upper oil return hole is larger than that of the lower oil return hole. The inner pipe of the liquid reservoir of the present invention is provided with an upper oil return hole and a lower oil return hole, and the size of the upper oil return hole is larger than that of the lower oil return hole. By optimizing and adjusting the size and position of the upper oil return hole and the lower oil return hole, it can not only ensure the normal oil return of the liquid reservoir under normal working conditions, but also adapt to the situation where the liquid reservoir accumulates liquid and the oil level is above the accumulated liquid. The lubricating oil can return to the compressor through the upper oil return hole in time, ensuring that the compressor is not short of oil, thereby improving the operating stability and service life of the compressor and the air-conditioning system using the compressor.

[0036] The following further elaborates on the structures of the liquid reservoir, rotary compressor and air-conditioning system of the present invention in conjunction with the accompanying drawings and specific embodiments. It can be understood that each specific embodiment does not limit the protection scope of the present invention.

[0037] Figure 1 FIG. is a schematic structural diagram of a liquid reservoir according to an embodiment of the present invention. Specifically, the liquid reservoir 1 includes a cylinder body 11, and an air inlet pipe 12 is arranged at one end of the cylinder body 11; an air outlet pipe 13 is arranged at the other end of the cylinder body 11; an inner pipe 14 is arranged inside the cylinder body 11. The inner pipe 14 is connected to the air outlet pipe 13, and an upper oil return hole 141a and a lower oil return hole 141b are arranged on one side of the inner pipe 14 close to the air outlet pipe 13, and the size of the upper oil return hole 141a is larger than that of the lower oil return hole 141b. The size mentioned here is the area of the upper oil return hole 141a / lower oil return hole 141b, or the "equivalent diameter". In actual use, the cross-sections of the upper oil return holes 141a, 141a', 141a'' / lower oil return holes 141b, 141b', 141b'' are circular (see Figure 1 Embodiment), elliptical (see Figure 2 Embodiment) or polygonal (see Figure 3 Embodiment). The area of the non-circular upper oil return hole 141a / lower oil return hole 141b is converted into a circle with an equivalent area, and the diameter of this circle is the equivalent diameter of the upper oil return hole 141a / lower oil return hole 141b. When the cross-section of the upper oil return hole 141a / lower oil return hole 141b is circular, its diameter is the equivalent diameter.

[0038] The equivalent diameter of the upper oil return hole 141a is d1, and the equivalent diameter of the lower oil return hole 141b is d2. In some embodiments, for the equivalent diameter d1 of the upper oil return hole 141a and the equivalent diameter d2 of the lower oil return hole 141b, the liquid returning from the lower oil return hole 141b of the liquid storage device is pure oil, and the liquid returning from the upper oil return hole 141a is a mixture of oil and refrigerant. However, when the oil return capabilities of both are required to be the same, the size of the upper oil return hole needs to be larger accordingly. Preferably, it satisfies: 1.1d2 ≤ d1 ≤ 1.8d2.

[0039] The distance between the upper oil return hole 141a and the bottom of the liquid storage device 1 is h1, the distance between the lower oil return hole 141b and the bottom of the liquid storage device 1 is h2, and the height of the inner tube 14 is h0. In some embodiments, it satisfies: 2h2 ≤ h1 ≤ 2 / 3h0. According to the structure of the liquid storage device, the position of the upper oil return hole 141a needs to be lower than the maximum liquid accumulation height. At the same time, the upper oil return hole 141a cannot fall into the lean oil area. Preferably, the distance h1 between the upper oil return hole and the bottom of the liquid storage device is between 19 mm and 46 mm.

[0040] The present invention further provides a rotary compressor, including a compressor body and the liquid storage device described above. Among them, the compressor body further includes a pump body assembly, and the pump body assembly includes at least one cylinder. That is, the compressor body can be a single-cylinder compressor or a multi-cylinder compressor. For example, when the compressor body is a single-cylinder compressor, the pump body assembly includes an upper cylinder head, a cylinder, and a lower cylinder head. The cylinder is connected to the air outlet pipe 13 of the liquid storage device. Further, an air intake channel can be provided on the upper cylinder head or the lower cylinder head, and both ends of the air intake channel are respectively connected to the air outlet pipe 13 and the cylinder. When the compressor body is a double-cylinder compressor, the pump body assembly includes an upper cylinder head, an upper cylinder, an intermediate plate, a lower cylinder, and a lower cylinder head. An air intake channel can be provided on the intermediate plate, one end of the air intake channel communicates with the air outlet pipe 13, and the other end communicates with the upper cylinder and the lower cylinder respectively.

[0041] The present invention further provides a rotary compressor air conditioning system including the above-mentioned one. In the air conditioning system, a refrigerant and lubricating oil are provided. The refrigerant can be R410A or R32, and the lubricating oil is a lubricating oil that is partially miscible with the refrigerant. The lubricating oil used in the air conditioning system is partially miscible with the refrigerant used, and the lubricating oil dissolves in the liquid refrigerant to form a lean oil area and a rich oil area. The oil return amount of the upper oil return hole 141a of the liquid storage device is proportional to the solubility of the lubricating oil in the rich oil area in the liquid refrigerant. Define the minimum solubility of the lubricating oil in the rich oil area in the liquid refrigerant as S; the equivalent diameter d1 of the upper oil return hole and the equivalent diameter d2 of the lower oil return hole satisfy d2 < d1 ≤ d2 / S. A list of the solubility of the lubricating oil in the rich oil area in the liquid refrigerant can be seen in Table 1. According to the physical properties of the partially miscible refrigerant and oil, the minimum solubility S is generally about 50%.

[0042] Table 1 is a list of the solubility of the lubricating oil in the liquid receiver in the refrigerant at different suction temperatures

[0043]

[0044]

[0045] In the air-conditioning system of the present invention, the structure of the upper oil return hole / lower oil return hole of the liquid receiver in the rotary compressor is adjusted according to the solubility of the lubricating oil in the refrigerant in the air-conditioning system, which not only ensures the normal oil return of the liquid receiver under normal working conditions, but also realizes that when the liquid receiver accumulates liquid and the oil level is above the accumulated liquid, the lubricating oil can timely return to the compressor body through the large oil return hole above, ensuring that the compressor body is not short of oil, thereby improving the stability, efficiency and service life of the whole machine operation of the air-conditioning system.

[0046] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present application is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A liquid reservoir, characterized in that, comprising: a cylinder body, an air inlet pipe is arranged at one end of the cylinder body; an air outlet pipe is arranged at the other end of the cylinder body; an inner pipe, which is arranged inside the cylinder body, the inner pipe is connected to the air outlet pipe and an upper oil return hole and a lower oil return hole are arranged on one side of the inner pipe close to the air outlet pipe; the size of the upper oil return hole is larger than the size of the lower oil return hole.

2. The liquid reservoir according to claim 1, characterized in that, the equivalent diameter of the upper oil return hole is d1, and the equivalent diameter of the lower oil return hole is d2, satisfying: 1.1d2 ≤ d1 ≤ 1.8d2.

3. The liquid reservoir according to claim 1, characterized in that, the distance between the upper oil return hole and the bottom of the liquid reservoir is h1, and the distance between the lower oil return hole and the bottom of the liquid reservoir is h2; the height of the inner pipe is h0, satisfying: 2h2 ≤ h1 ≤ 2 / 3h0.

4. The liquid reservoir according to claim 1, characterized in that, the distance between the upper oil return hole and the bottom of the liquid reservoir is h1, satisfying: 19mm ≤ h1 ≤ 46mm.

5. The liquid reservoir according to claim 1, characterized in that, the cross-section of the upper oil return hole is circular, elliptical or polygonal; and / or the cross-section of the lower oil return hole is circular, elliptical or polygonal.

6. A rotary compressor, characterized in that, comprising a compressor body and the liquid reservoir according to any one of claims 1 to 5.

7. The rotary compressor according to claim 6, characterized in that, the compressor body further comprises a pump body assembly; the pump body assembly comprises at least one cylinder; the at least one cylinder is connected to the air outlet pipe.

8. An air conditioning system, characterized in that, comprising the rotary compressor according to claim 6 or 7.

9. The air conditioning system according to claim 8, characterized in that, the lubricating oil used in the air conditioning system is partially miscible with the refrigerant used, the lubricating oil dissolves in the liquid refrigerant and forms a lean oil region and a rich oil region, and the minimum solubility of the lubricating oil in the rich oil region in the liquid refrigerant is S; the equivalent diameter of the upper oil return hole is d1, and the equivalent diameter of the lower oil return hole is d2, satisfying: d2 < d1 ≤ d2 / S.

10. The air conditioning system according to claim 9, characterized in that, the refrigerant is R410A or R32.

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