Compressor air inlet assembly and refrigerating system

Abstract

The invention provides a compressor air inlet assembly and a refrigerating system. The compressor air inlet assembly comprises a compressor body, a first air inlet and a second air inlet, a first pipe; the gas-liquid separator communicates with the compressor body through a first pipeline and comprises a shell, a second pipeline, a filter screen and an air inlet pipe, the second pipeline is connected with the shell and used for sucking a refrigerant into the shell, the air inlet pipe is located in the shell, an inlet of the air inlet pipe faces the second pipeline, and an outlet of the air inlet pipe communicates with the first pipeline; the air inlet pipe is a taper pipe, the large-diameter end of the taper pipe is the inlet end of the air inlet pipe, the filter screen is installed in the shell and located between the air inlet pipe and the second pipeline, and a gap is reserved between the inlet end of the air inlet pipe and the filter screen. The flow resistance loss of the whole refrigerating system can be reduced, meanwhile, the pressure pulsation of the compressor is reduced, the influence of the pressure pulsation is optimized, the flow of a low-density refrigerant can be greatly improved, and the problem that the increasing amplitude of the refrigerating capacity is small or even cannot be increased along with the increasing of the rotating speed of the compressor is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and particularly to a compressor intake assembly and a refrigeration system. Background Art

[0002] Refrigerant, also known as refrigerant or coolant, is a working fluid used to transfer heat energy and produce a refrigeration effect in systems such as refrigeration and air conditioning. In the context of energy conservation and emission reduction, refrigerant replacement has become an inevitable trend. The main reason is that traditional refrigerants such as HFCs (hydrofluorocarbons) have a greater impact on the environment and need to be replaced by more environmentally friendly refrigerants. The process of refrigerant replacement is in full swing. Alternative refrigerants with low global warming potential have advantages such as efficient cooling, low energy consumption, and environmental friendliness. With the intensification of global climate change, the adoption of alternative refrigerants with low GWP (global warming potential) has become an important development direction for refrigeration technology.

[0003] Currently, alternative refrigerants with low global warming potential generally have the characteristics of low density and low volumetric refrigerating capacity. Volumetric refrigerating capacity refers to the amount of cold generated by a refrigeration compressor when it inhales 1 cubic meter of refrigerant vapor per unit time. Therefore, if an alternative refrigerant with low global warming potential needs to achieve the same refrigerating capacity as a traditional refrigerant, the compressor often means a larger displacement and a larger volumetric flow rate. A common problem brought about by a larger displacement and a larger volumetric flow rate is that in various parts of the air-conditioning system, the fluid often has a higher flow velocity, and the high flow velocity has a negative impact on performance. One is that the flow resistance loss of the compressor is relatively large, and the second negative impact is that the pressure pulsation of the compressor is relatively large. These two aspects of influence will cause an increase in the flow resistance of the low-density refrigerant. Moreover, as the rotational speed of the compressor increases, the refrigerating capacity cannot be effectively improved and may even decrease due to excessive flow resistance, as Figure 1 shown, Figure 1 where the abscissa in Figure 1 is the operating frequency of the compressor, and the operating frequency of the compressor is directly related to the rotational speed of the compressor. The higher the operating frequency, the faster the rotational speed of the compressor. Therefore, it can be seen from Figure 1 that when the rotational speed of the compressor increases to a certain extent, the refrigerating capacity will instead decrease. Summary of the Invention

[0004] The purpose of the present invention is to provide a compressor intake assembly and a refrigeration system, which can effectively reduce the flow resistance loss of the entire refrigeration system, while reducing the pressure pulsation of the compressor, optimizing the influence of the pressure pulsation, and is particularly applicable to a refrigeration system using a low-density refrigerant, which can greatly increase the flow rate of the low-density refrigerant and solve the problem that the increase in refrigerating capacity is small or even not improved as the rotational speed of the compressor increases.

[0005] To achieve the above purpose, the present invention provides a compressor intake assembly, which includes:

[0006] Compressor body;

[0007] First pipeline;

[0008] Gas-liquid separator, the gas-liquid separator is communicated with the compressor body through the first pipeline, the gas-liquid separator includes a housing, a second pipeline, a filter screen and an air inlet pipe, the second pipeline is connected to the housing for sucking refrigerant into the housing, the air inlet pipe is located in the housing, and the inlet of the air inlet pipe faces the second pipeline, the outlet of the air inlet pipe is communicated with the first pipeline, the air inlet pipe is a tapered pipe, and the large-diameter end of the tapered pipe is the inlet end of the air inlet pipe, the filter screen is installed in the housing and is located between the air inlet pipe and the second pipeline, and there is a gap between the inlet end of the air inlet pipe and the filter screen.

[0009] Optionally, the gap between the inlet end of the air inlet pipe and the filter screen is not less than 5 mm.

[0010] Optionally, the taper angle range of the air inlet pipe is between 5° and 15°.

[0011] Optionally, the filter screen is fixed to the inner wall of the housing through a bracket.

[0012] Optionally, the filter screen is arc-shaped and protrudes towards the second pipeline.

[0013] Optionally, the second pipeline and the air inlet pipe are coaxially arranged.

[0014] Optionally, the diameter of the outlet end of the air inlet pipe is larger than the diameter of the second pipeline.

[0015] Optionally, the compressor body includes a compressor housing, a third pipeline, a cylinder component and a crankshaft, the cylinder component is located in the compressor housing, the crankshaft passes through the cylinder component for driving the cylinder component to compress the refrigerant, the first pipeline communicates with the cylinder component, and the third pipeline is connected to the compressor housing for discharging the refrigerant compressed by the cylinder component.

[0016] Optionally, the diameter of the third pipeline is smaller than the diameter of the first pipeline.

[0017] Based on another aspect of the present invention, the present invention further provides a refrigeration system, the refrigeration system includes a compressor intake assembly as described in any one of claims 1 to 9, the refrigeration system further includes an evaporator, a condenser, and an expansion valve, and the evaporator, the compressor intake assembly, the condenser and the expansion valve are sequentially connected in series through pipelines to form a circulation loop.

[0018] With the above configuration, the gas-liquid separator is connected to the compressor body through the first pipeline, so as to transport the gaseous refrigerant into the compressor body for compression. On the one hand, the intake pipe is designed as a tapered pipe, and the large-diameter end of the tapered pipe is the inlet end of the intake pipe. On the other hand, there is a gap between the inlet end of the intake pipe and the filter screen, and the gap is not less than 5 mm. Through such two aspects of design, the flow resistance loss of the entire refrigeration system can be effectively reduced, and at the same time, the pressure pulsation of the compressor can be reduced, optimizing the influence of the pressure pulsation. It is especially suitable for refrigeration systems using low-density refrigerants, can greatly increase the flow rate of low-density refrigerants, improve the refrigeration efficiency and capacity, reduce energy consumption, and solve the problem that the increase in refrigeration capacity is small or even not improved with the increase in the compressor speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Those of ordinary skill in the art should understand that the provided drawings are used to better understand the present invention and do not constitute any limitation to the scope of the present invention. Among them:

[0020] Figure 1 is a schematic diagram of the refrigeration capacity of the prior art changing with the compressor operating frequency;

[0021] Figure 2 is a schematic diagram of the compressor intake assembly according to an embodiment of the present invention.

[0022] Among them, the reference numerals are as follows:

[0023] 1 - compressor body; 11 - compressor housing; 12 - third pipeline; 13 - cylinder member; 14 - crankshaft; 15 - first cylinder head; 16 - second cylinder head; 2 - first pipeline; 3 - gas-liquid separator; 31 - housing; 32 - second pipeline; 33 - filter screen; 34 - intake pipe; 35 - bracket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In this article, unless otherwise specified, the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "top", "bottom", etc. are used to indicate the orientation or position relationship based on the drawings, and are 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 and operation, so it cannot be understood as a limitation to the present invention.

[0025] The specific embodiments of the present invention will be described in more detail below with reference to the schematic diagrams. According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0026] Figure 2 is a schematic diagram of the compressor intake assembly according to an embodiment of the present invention. Please refer to Figure 2, an embodiment of the present invention provides a compressor intake assembly, including a compressor body 1, a first pipeline 2, and a gas-liquid separator 3. The gas-liquid separator 3 is connected to the compressor body 1 through the first pipeline 2, so as to deliver gaseous refrigerant into the compressor body 1 through the first pipeline 2 for compression.

[0027] The gas-liquid separator 3 includes a housing 31, a second pipeline 32, a filter screen 33, and an intake pipe 34. The second pipeline 32 is connected to the housing 31 and is used to suck refrigerant into the housing 31. The intake pipe 34 is located inside the housing 31, and the inlet of the intake pipe 34 faces the second pipeline 32. The outlet of the intake pipe 34 is connected to the first pipeline 2. The intake pipe 34 is a tapered pipe, and the large-diameter end of the tapered pipe is the inlet end of the intake pipe 34, and the small-diameter end of the tapered pipe is the outlet end of the intake pipe 34. Further, from the perspective of fluid mechanics, the cone angle α of the intake pipe 34 is preferably in the range of 5° to 15°, that is, 5° ≤ α ≤ 15°. For example, in this embodiment, when the cone angle α is 8°, the effect of reducing flow resistance loss and optimizing pressure pulsation is the best. Preferably, the second pipeline 32 and the intake pipe 34 are coaxially arranged, which is beneficial to reducing flow resistance loss. Generally, in the working state, the axis of the second pipeline 32 is in the vertical direction, that is, the refrigerant enters the gas-liquid separator 3 downward and then enters the intake pipe 34 downward. Further, the diameter of the outlet end of the intake pipe 34 is larger than the diameter of the second pipeline 32. In the working state, that is, the diameter of the lower end of the intake pipe 34 is larger than the diameter of the second pipeline 32, which is beneficial to reducing the flow rate of the refrigerant, thereby further reducing the flow resistance loss and reducing the pressure pulsation. It can be understood that the refrigerant first enters the gas-liquid separator, and the liquid refrigerant and gaseous refrigerant are separated by the gas-liquid separator. Among them, the gaseous refrigerant enters the intake pipe 34 and then flows into the compressor body 1 through the first pipeline 2.

[0028] The filter screen 33 is installed inside the housing 31 and is located between the intake pipe 34 and the second pipeline 32. Exemplarily, the filter screen 33 can be fixed to the inner wall of the housing 31 through a bracket 35. In some other embodiments, the filter screen 33 can also be welded to the inner wall of the housing 31. Further, the filter screen 33 is an arc surface, and the filter screen 33 protrudes towards the second pipeline 32. The filter screen 33 can block solid particles and protect the equipment from being damaged. For example, the filter screen 33 is a spherical surface. There is a spacing h between the inlet end of the intake pipe 34 and the filter screen 33. Further, the spacing h between the inlet end of the intake pipe 34 and the filter screen 33 is not less than 5 mm, such as Figure 2As shown, the spacing h is the distance from the lower end face of the filter screen 33 to the inlet end of the intake pipe 34. Considering actual assembly, the spacing h generally does not exceed 20 mm. The flow resistance of the fluid flowing in the pipeline can be divided into two types: frictional resistance and local resistance. The frictional resistance refers to the resistance generated by the fluid flowing through a straight pipe with a certain pipe diameter due to the internal friction of the fluid. The magnitude of the frictional resistance is proportional to the length of the path. The local resistance is the resistance of the fluid flowing through local parts such as pipe fittings, valves, and sudden expansions and contractions of the cross-section in the pipeline. Increasing the spacing h can effectively reduce the local resistance loss inside the gas-liquid separator 3, thereby reducing the total flow resistance loss.

[0029] In this embodiment, a rotary compressor is taken as an example. The compressor body 1 includes a compressor housing 11, a third pipe 12, a cylinder member 13, and a crankshaft 14. The cylinder member 13 is located in the compressor housing 11, and the crankshaft 14 passes through the cylinder member 13 to drive the cylinder member 13 to compress the refrigerant. It can be understood that the cylinder member 13 includes a first cylinder head 15, a second cylinder head 16, and a piston. The piston is sleeved on the crankshaft 14 and is located in the inner cavity of the cylinder member 13 to compress the refrigerant in the inner cavity of the cylinder member 13. The first pipe 2 communicates with the cylinder member 13, and the third pipe 12 is connected to the compressor housing 11 to discharge the refrigerant compressed by the cylinder member 13. Exemplarily, at least a part of the third pipe 12 is located outside the compressor housing 11. Further, the diameter of the third pipe 12 is smaller than the diameter of the first pipe 2. It can be understood that after the refrigerant is compressed by the cylinder member 13, its density increases and its volume decreases. Therefore, the diameter of the third pipe 12 can be smaller than the diameter of the first pipe 2.

[0030] With the above configuration, the gas-liquid separator is connected to the compressor body 1 through the first pipe 2 to deliver the gaseous refrigerant into the compressor body 1 for compression. On the one hand, the intake pipe 34 is designed as a tapered pipe, and the large-diameter end of the tapered pipe is the inlet end of the intake pipe 34. On the other hand, a spacing is left between the inlet end of the intake pipe 34 and the filter screen 33, and this spacing is not less than 5 mm. Through these two aspects of design, the flow resistance loss of the entire refrigeration system can be effectively reduced, while reducing the pressure pulsation of the compressor, optimizing the influence of the pressure pulsation, especially applicable to refrigeration systems using low-density refrigerants, which can greatly increase the flow rate of low-density refrigerants, improve the refrigeration efficiency and capacity, reduce energy consumption, and solve the problem that the increase in refrigeration capacity is small or even not increased with the increase in the compressor speed.

[0031] This embodiment also provides a refrigeration system, which includes the compressor intake assembly as described above. The refrigeration system further includes an evaporator, a condenser, and an expansion valve. The evaporator, the compressor intake assembly, the condenser, and the expansion valve are connected in series through pipes in sequence to form a circulation loop, that is: evaporator → compressor intake assembly → condenser → expansion valve → evaporator. The taper tube design of the intake pipe 34 and the control of the spacing h in the present invention not only reduce the flow resistance loss in the gas-liquid separator, but also reduce the flow resistance loss in the entire refrigeration system. Among them, the present invention has a significant effect on reducing the flow resistance loss in the stage from the evaporator to the compressor intake assembly. For example, when the taper angle α is 8° and the spacing h is 10 mm, the average pressure loss can be reduced by 6%.

[0032] It should be noted that the references to "one embodiment", "embodiment", "specific embodiment", "some embodiments", etc. in the specification only indicate that the described embodiments may include specific features, structures or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in combination with an embodiment, whether explicitly described or not, implementing such feature, structure or characteristic in combination with other embodiments is within the knowledge of those skilled in the relevant art.

[0033] It should be noted that the various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description in the method part.

[0034] It should also be noted that although the present invention has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, many possible changes and modifications can be made to the technical solution of the present invention by using the technical content disclosed above, or modified into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still belong to the scope of protection of the technical solution of the present invention.

[0035] It should also be understood that unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequence relationship, etc. between the various components, elements, steps.

[0036] It should also be recognized that the terminology described herein is only used to describe specific embodiments and is not intended to limit the scope of the present invention. It must be noted that the singular forms "a" and "an" used herein and in the appended claims include plural referents unless the context clearly dictates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices and may include sub-steps and sub-devices. All conjunctions used should be understood in their broadest sense. Also, the word "or" should be understood to have the definition of a logical "or" rather than a logical "exclusive or" unless the context clearly dictates otherwise. In addition, the implementation of the methods and / or devices in the embodiments of the present invention may include performing the selected tasks manually, automatically, or in combination.

Claims

1. A compressor intake assembly, characterized in that, Comprising: Compressor body; First pipeline; Gas-liquid separator, the gas-liquid separator is communicated with the compressor body through the first pipeline, the gas-liquid separator includes a housing, a second pipeline, a filter screen and an air inlet pipe, the second pipeline is connected to the housing for sucking refrigerant into the housing, the air inlet pipe is located in the housing, and the inlet of the air inlet pipe faces the second pipeline, the outlet of the air inlet pipe is communicated with the first pipeline, the air inlet pipe is a tapered pipe, and the large-diameter end of the tapered pipe is the inlet end of the air inlet pipe, the filter screen is installed in the housing and is located between the air inlet pipe and the second pipeline, and there is a spacing between the inlet end of the air inlet pipe and the filter screen.

2. The compressor intake assembly according to claim 1, wherein The spacing between the inlet end of the air inlet pipe and the filter screen is not less than 5 mm.

3. The compressor intake assembly according to claim 1, wherein, The taper angle range of the air inlet pipe is between 5° and 15°.

4. The compressor intake assembly according to claim 1, characterized in that, The filter screen is fixed to the inner wall of the housing by a bracket.

5. The compressor intake assembly according to claim 1, characterized in that, The filter screen is an arc surface and protrudes towards the direction of the second pipeline.

6. The compressor intake assembly according to claim 1, characterized in that, The second pipeline and the air inlet pipe are coaxially arranged.

7. The compressor intake assembly according to claim 1, characterized in that, The diameter of the outlet end of the air inlet pipe is larger than the diameter of the second pipeline.

8. The compressor intake assembly according to claim 1, characterized in that, The compressor body includes a compressor housing, a third pipeline, a cylinder component and a crankshaft, the cylinder component is located in the compressor housing, the crankshaft passes through the cylinder component for driving the cylinder component to compress the refrigerant, the first pipeline is communicated with the cylinder component, and the third pipeline is connected to the compressor housing for discharging the refrigerant compressed by the cylinder component.

9. The compressor intake assembly according to claim 8, characterized in that, The diameter of the third pipeline is smaller than the diameter of the first pipeline.

10. A refrigeration system, characterized in that, Comprising the compressor air intake assembly according to any one of claims 1 to 9, the refrigeration system further includes an evaporator, a condenser and an expansion valve, and the evaporator, the compressor air intake assembly, the condenser and the expansion valve are sequentially connected in series through pipelines to form a circulation loop.

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