Oil separator, compressor and heat pump unit

Abstract

The utility model provides an oil separator, compressor and heat pump unit, including barrel, and the oil return pipe and air inlet pipe that pass through the inside and outside of barrel, the air inlet of air inlet pipe is communicated with the high pressure exhaust port of compressor, and the air outlet of air inlet pipe is arranged opposite to the pipe wall of oil return pipe; the gas inlet pipe is used for spraying high-temperature and high-pressure oil gas discharged by the compressor to the pipe wall of the oil return pipe so as to heat return oil in the oil return pipe. According to the oil separator, the compressor and the heat pump unit, the technical problem that oil return is difficult when the heat pump unit is started under the low-temperature working condition in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of heat pump oil separator technology, specifically to an oil separator, compressor and heat pump unit. Background Technology

[0002] When air source heat pump units operate in low-temperature environments, the circulation of their lubricating oil has a critical impact on the unit's reliable operation. However, during low-temperature startup, the lubricating oil's low temperature and high viscosity significantly increase the flow resistance in the oil return line, leading to difficulties in lubricating oil return and potentially causing compressor oil shortages. This increases the risk of equipment wear and affects the unit's service life.

[0003] Therefore, existing technologies need further development. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and provide an oil separator, compressor and heat pump unit to solve the technical problem of difficult oil return when the heat pump unit starts under low temperature conditions in related technologies.

[0005] To achieve the above technical objectives, the present invention adopts the following technical solution: an oil separator is provided, including a cylinder and an oil return pipe and an air inlet pipe passing through the inside and outside of the cylinder. The air inlet of the air inlet is connected to the high-pressure exhaust port of the compressor, and its air outlet is arranged opposite to the pipe wall of the oil return pipe. The air inlet pipe is used to spray the high-temperature and high-pressure oil gas discharged from the compressor onto the pipe wall of the oil return pipe to heat the oil return in the oil return pipe.

[0006] Furthermore, the return oil pipe includes a straight pipe and a bent pipe with uniform diameter; the straight pipe extends in a direction parallel to the axis of the cylinder, from the bottom of the cylinder to the upper middle part of the cylinder; the bent pipe is connected to the straight pipe and extends out of the cylinder.

[0007] Furthermore, heat-conducting fins are fitted onto the straight pipe.

[0008] Furthermore, the heat-conducting fins are fitted onto the end where the straight pipe and the bent pipe connect; the air outlet of the air inlet pipe is positioned opposite to the heat-conducting fins.

[0009] Furthermore, the heat-conducting fins are made of heat-conducting material and are spirally wound and sleeved on the straight tube.

[0010] Furthermore, the air outlet is an inwardly concave arc-shaped structure, which matches the outer contour of the heat-conducting fins, thereby forming a local coating structure on the outer periphery of the heat-conducting fins to increase the contact area between the high-temperature oil and gas and the return oil pipe.

[0011] Furthermore, the intake pipe is arranged along the width of the cylinder and is perpendicular to the return oil pipe so that the exhaust port is vertically aligned with the outer wall of the return oil pipe.

[0012] Furthermore, a filter is installed at the bottom of the cylinder. The filter is connected to the inlet of the return oil pipe. After separation, the oil flows to the filter, passes through the filter, enters the return oil pipe, and finally flows out from the outlet of the return oil pipe.

[0013] Furthermore, a bracket is fixed on the inner wall of the cylinder, and the return oil pipe passes through the bracket. The bracket is used to support and fix the return oil pipe to prevent the return oil pipe from shaking inside the cylinder due to pressure difference.

[0014] Furthermore, there are multiple supports, and each support is spaced apart along the length of the return oil pipe.

[0015] A compressor including the oil separator as described above.

[0016] A heat pump unit includes a compressor as described above.

[0017] Beneficial effects:

[0018] 1. The oil separator of this utility model sets the outlet of the air inlet pipe to the opposite return oil pipe, so that high-temperature and high-pressure oil gas can be directly sprayed to the return oil pipe. The high-temperature oil gas heats the oil in the return oil pipe, reducing the viscosity and flow resistance of the oil, thereby effectively solving the problem of difficult oil return when the heat pump unit starts under low temperature conditions.

[0019] 2. The heat-conducting fins on the surface of the oil return pipe of the oil separator of this utility model increase the contact area between the oil return pipe and the high-temperature oil and gas, thereby further improving the heat exchange efficiency.

[0020] 3. The high pressure inside the cylinder pushes the separated oil into the return oil pipe, and then back to the compressor, ensuring effective oil-gas separation. Simultaneously, the bottom filter removes impurities from the separated oil, ensuring its cleanliness.

[0021] 4. The compressor of this utility model adopts an oil separator with this structure, which can ensure stable operation in low-temperature environments, reduce the risk of equipment wear, and extend the service life of the unit.

[0022] 5. The heat pump unit of this utility model adopts a structure including the above-mentioned compressor, which can operate efficiently under low temperature conditions, improve the energy efficiency ratio and heating efficiency, and meet the user's needs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an existing oil separator;

[0024] Figure 2 This is a schematic diagram of the oil separator used in an embodiment of this utility model;

[0025] Figure 3 This is an exploded view of the oil separator used in this embodiment of the utility model;

[0026] Figure 4 This is a schematic diagram of the oil return pipe of the oil separator used in this embodiment of the utility model;

[0027] Figure 5 This is a schematic diagram of the air inlet pipe of the oil separator used in this embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the air inlet and outlet of the oil separator used in this embodiment of the utility model from one perspective.

[0029] Figure 7 This is a schematic diagram of the air inlet and outlet of the oil separator used in this embodiment of the utility model from another perspective;

[0030] Figure 8 This is a diagram showing the assembly and use of the return oil pipe and filter in this embodiment of the utility model.

[0031] Figure 9 This is a schematic diagram of the structure of the filter in the oil separator used in this embodiment of the utility model;

[0032] Figure 10 This is a schematic diagram of the support structure of the oil separator used in this embodiment of the utility model.

[0033] The above figures include the following reference numerals:

[0034] 1. Cylinder body; 11. Exhaust port; 2. Oil return pipe; 21. Straight pipe; 22. Bent pipe; 23. Heat-conducting fins; 3. Air inlet pipe; 31. Air outlet; 4. Filter; 5. Support; 6. Exhaust pipe. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] According to an embodiment of this utility model, an oil separator is provided. Please refer to [link / reference]. Figures 2 to 10The system includes a cylinder 1 and an oil return pipe 2 and an air inlet pipe 3 running through the inside and outside of the cylinder 1. The air inlet of the air inlet pipe 3 is connected to the high-pressure exhaust port of the compressor, and its air outlet 31 is positioned opposite to the wall of the oil return pipe 2. The air inlet pipe 3 is used to spray the high-temperature, high-pressure oil vapor discharged from the compressor onto the wall of the oil return pipe 2 to heat the oil in the oil return pipe 2. When the air source heat pump heating unit is started directly from a cold start at a low ambient temperature, the oil temperature is low and the viscosity is high, resulting in extremely high flow resistance in the capillary tube of the oil return line. This makes effective oil return difficult in a short time (and may even cause the oil to solidify in the capillary tube). However, to control the amount of oil returned during stable operation, the flow resistance of the oil return capillary tube must not be reduced. Faced with this contradiction... Figure 1 The conventional oil separator shown cannot solve the problem. This embodiment makes improvements based on existing oil separators, such as... Figure 2 As shown, the oil-gas mixture enters the intake pipe 3 from the high-pressure exhaust port of the compressor and is separated inside the cylinder 1. An exhaust pipe 6 is installed on the exhaust port 11. After the high-temperature, high-pressure oil-gas mixture is injected into the cylinder 1, the gas portion, due to its lower density, rises and is eventually discharged from the exhaust pipe 6; while the oil portion, due to its higher density, flows downwards along the inner wall of the cylinder 1 and is pushed by the high pressure from the inlet of the return oil pipe 2 to the outlet at a higher position, eventually flowing back to the compressor. The high-temperature, high-pressure oil-gas mixture from the intake pipe 3 is directly injected into the return oil pipe 2, using the heat energy of the high-temperature oil-gas mixture to heat the oil in the return oil pipe 2, effectively reducing the oil viscosity and flow resistance, allowing the oil to flow back to the compressor more smoothly. This design not only solves the problem of high oil viscosity and difficulty in oil return under low-temperature conditions but also prevents oil adhesion through continuous heating, ensuring stable compressor operation. The oil separator in this embodiment solves the technical problem of difficult oil return during startup of heat pump units under low-temperature conditions in related technologies.

[0037] See Figure 2 , Figure 3 and Figure 4 In this embodiment, the oil separator's return oil pipe 2 includes a straight pipe 21 and a bent pipe 22 with uniform diameter. The straight pipe 21 extends parallel to the axis of the cylinder 1, from the bottom of the cylinder 1 to the upper middle part of the cylinder 1. The bent pipe 22 is connected to the straight pipe 21 and extends out of the cylinder 1. The high-temperature, high-pressure oil and gas from the intake pipe 3 is directly sprayed onto the wall of the return oil pipe 2, continuously heating and reducing the viscosity of the oil in the return oil pipe 2, significantly reducing flow resistance, and allowing the lubricating oil to flow smoothly back to the compressor, avoiding poor oil return or blockage due to excessive viscosity. By designing the return oil pipe 2 as a combination of a straight pipe 21 and a bent pipe 22, with the straight pipe 21 extending to the bottom of the cylinder, it ensures that the separated lubricating oil can smoothly enter the return oil pipe from the bottom of the cylinder, while the bent pipe 22 leads the return oil outlet out of the cylinder, realizing that the lubricating oil flows from the bottom to the top and is discharged to the low-pressure side of the compressor, thereby effectively solving the problem of difficult oil return in low-temperature environments.

[0038] See Figure 2 , Figure 3 , Figure 4 and Figure 5 and Figure 6 In this embodiment, the oil separator has heat-conducting fins 23 fitted onto the straight pipe 21. The design of the heat-conducting fins 23 significantly increases the contact area between the straight pipe 21 and the high-temperature, high-pressure oil and gas, effectively enhancing the heat transfer efficiency and enabling the high-temperature oil and gas to heat the lubricating oil in the straight pipe 21 more evenly and efficiently.

[0039] See Figure 5 and Figure 6 In this embodiment of the oil separator, heat-conducting fins 23 are sleeved on the end where the straight pipe 21 connects to the bent pipe 22; the outlet 31 of the air inlet pipe 3 is opposite to the heat-conducting fins 23. The heat-conducting fins 23 are arranged at the connection between the straight pipe 21 and the bent pipe 22, which is a key transition area for lubricating oil to flow to the outlet. The high-temperature oil gas from the air inlet pipe 3 is directly sprayed onto the heat-conducting fins 23, further concentrating heat for heat exchange in this area, thereby increasing the temperature of the lubricating oil before it flows out of the return oil pipe 2. Since the viscosity of the lubricating oil gradually decreases as it flows through the end of the return oil pipe 2, combined with the design of the heat-conducting fins 23 and direct injection heating, the resistance of the oil flowing from the bent pipe 22 to the outlet is effectively reduced, improving the overall oil discharge efficiency of the return oil pipe.

[0040] See Figure 6 and Figure 7 In this embodiment, the oil separator uses heat-conducting fins 23 made of heat-conducting material, which are spirally coiled and mounted on the straight pipe 21. The heat-conducting fins 23 extend outwards from the outer wall of the oil return pipe 2 at a certain angle and spacing, forming a series of continuous spiral coiled structures. These structures are arranged sequentially along the length of the oil return pipe 2, forming a continuous, wavy fin strip. This spiral coiled fin design significantly increases the contact area between the oil return pipe 2 and the oil-gas mixture, allowing more heat to be transferred to the oil in the oil return pipe, thus improving heat exchange efficiency. Furthermore, the spiral coiled structure of the heat-conducting fins 23 also slows down the downward flow of high-temperature oil, allowing the oil to remain in the oil return pipe for a longer time, which is beneficial for sufficient heat transfer and uniform heating of the oil.

[0041] See Figure 6 and Figure 7In this embodiment, the oil separator has an inwardly concave arc-shaped outlet 31, which matches the outer contour of the heat-conducting fins 23. This creates a partial covering structure on the outer periphery of the heat-conducting fins 23, increasing the contact area between the high-temperature oil / gas and the return oil pipe 2. The matching of the arc-shaped outlet 31 with the outer contour of the heat-conducting fins 23 to form this partial covering structure significantly increases the contact area between the high-temperature oil / gas and the heat-conducting fins 23 (i.e., the return oil pipe 2 inside the heat-conducting fins 23). A larger contact area means more heat can be transferred from the high-temperature oil / gas to the oil in the return oil pipe per unit time, thereby improving heat exchange efficiency.

[0042] See Figure 6 In this embodiment of the oil separator, the inlet pipe 3 is arranged along the width direction of the cylinder 1 and is perpendicular to the return oil pipe 2, so that the outlet 31 is perpendicularly aligned with the outer wall of the return oil pipe 2. Because the outlet 31 is perpendicularly aligned with the outer wall of the return oil pipe 2, the high-temperature oil gas can directly impact and closely contact the oil in the return oil pipe, thereby achieving sufficient heating of the oil. This direct contact heat exchange method is more efficient than indirect heat exchange, can reduce the viscosity of the oil more quickly, and promotes smooth oil return. The perpendicular alignment of the outlet 31 with the return oil pipe 2 helps optimize the flow of oil gas within the cylinder. After the high-temperature, high-pressure oil gas is ejected from the outlet 31, it can form a layer of hot air along the outer wall of the return oil pipe 2. This layer of hot air not only heats the oil in the return oil pipe 2 but also promotes the rise and separation of the gas portion in the oil-gas mixture. Simultaneously, the oil portion flows downward along the inner wall of the cylinder 1, forming a clear oil-gas separation path. By improving heat exchange efficiency and optimizing oil-gas flow, the oil separator in this embodiment can more effectively utilize the thermal energy of high-temperature oil and gas to heat the oil in the return oil pipe, thereby reducing energy waste.

[0043] See Figure 8 and Figure 9 In this embodiment of the oil separator, a filter 4 is installed at the bottom of the cylinder 1. The filter 4 is connected to the inlet of the return oil pipe 2. After separation, the oil flows to the filter 4, passes through the filter, enters the return oil pipe 2, and finally flows out from the outlet of the return oil pipe 2. The filter 4 can effectively filter out impurities, particulate matter, and any tiny air bubbles that may be present in the oil, ensuring that the oil entering the return oil pipe 2 has a high degree of cleanliness. During the oil-gas separation process, part of the oil flows down along the inner wall of the cylinder to the filter 4 at the bottom. Through the filtration effect of the filter, the gas components in the oil can be further separated, improving the efficiency of oil-gas separation. This helps to reduce the residual gas inside the compressor and improve the performance of the equipment. Clean oil can reduce corrosion and wear inside the return oil pipe, thereby extending the service life of the return oil pipe. By installing the filter 4 and ensuring the cleanliness of the oil, the reliability and stability of the entire oil separator and even the compressor system can be improved. This helps to reduce the equipment failure rate and downtime, and improve the operating efficiency and production efficiency of the equipment.

[0044] See Figure 10 In this embodiment of the oil separator, a bracket 5 is fixed to the inner wall of the cylinder 1. The return oil pipe 2 passes through the bracket 5. The bracket 5 supports and fixes the return oil pipe 2, preventing it from swaying within the cylinder 1 due to pressure differential. As an additional support structure, the bracket 5 significantly enhances the stability of the return oil pipe 2 within the cylinder 1. During the operation of the oil separator, the return oil pipe 2 may be subjected to certain impact forces or vibrations due to the flow of the oil-gas mixture and changes in pressure differential. The presence of the bracket 5 effectively prevents the return oil pipe 2 from swaying or shifting due to these external forces, thereby ensuring stable operation of the equipment. When the oil-gas mixture flows through the return oil pipe 2 near the bracket 5, the blocking effect of the bracket 5 allows the oil-gas mixture to be more evenly distributed around the return oil pipe 2, increasing the heat exchange area and efficiency. The supporting effect of the bracket 5 reduces the swaying of the return oil pipe 2 within the cylinder 1, thereby reducing friction and wear between the return oil pipe 2 and the inner wall of the cylinder 1. This not only extends the service life of the equipment but also reduces the risk of leakage due to wear.

[0045] See Figure 10 In this embodiment, the oil separator has multiple supports 5, which are spaced apart along the length of the return oil pipe 2. The multiple supports 5 spaced apart along the length of the return oil pipe 2 provide multiple support points for the return oil pipe 2, thereby enhancing its stability within the cylinder 1. This design is particularly suitable for long-distance return oil pipes 2, effectively preventing them from bending or shaking due to their own weight or external pressure.

[0046] In this embodiment, there are two supports 5, one located below the heat-conducting fins 23 and the other above the filter 4. An oil-gas separation assembly is disposed between the two supports 5. The two supports 5 provide stable support for the oil return pipe 2 and the entire oil-gas separation assembly (not shown in the figure). The support 5 at the bottom of the heat-conducting fins 23 not only supports the oil return pipe 2, but also optimizes the flow path of the oil-gas mixture through its position, so that the oil-gas mixture can be more evenly distributed before entering the oil-gas separation assembly, thereby improving the separation efficiency.

[0047] The compressor in this embodiment uses the aforementioned oil separator, which ensures stable operation in low-temperature environments, reduces the risk of equipment wear, and extends the service life of the unit.

[0048] The heat pump unit in this embodiment adopts a structure including the above-mentioned compressor, which can operate efficiently under low temperature conditions, improve the energy efficiency ratio and heating efficiency, and meet the user's needs.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0051] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0052] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0053] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An oil separator, comprising a cylinder (1) and an oil return pipe (2) and an air inlet pipe (3) passing through the inside and outside of the cylinder (1), characterized in that, The air inlet of the air inlet (3) is connected to the high-pressure exhaust port of the compressor, and the air outlet (31) is set opposite to the wall of the oil return pipe (2). The intake pipe (3) is used to spray the high-temperature and high-pressure oil gas discharged from the compressor onto the wall of the return oil pipe (2) to heat the return oil in the return oil pipe (2).

2. The oil separator according to claim 1, characterized in that, The return oil pipe (2) includes a straight pipe (21) with a uniform diameter and a bent pipe (22). The straight pipe (21) extends in a direction parallel to the axis of the cylinder (1), from the bottom of the cylinder (1) to the upper middle part of the cylinder (1); The bent pipe (22) is connected to the straight pipe (21) and extends out of the cylinder (1).

3. The oil separator according to claim 2, characterized in that, The straight tube (21) is fitted with heat-conducting fins (23).

4. The oil separator according to claim 3, characterized in that, The heat-conducting fins (23) are sleeved on one end of the straight pipe (21) that connects to the bent pipe (22); The air outlet (31) of the air inlet pipe (3) is positioned opposite to the heat-conducting fins (23).

5. The oil separator according to claim 4, characterized in that, The heat-conducting fins (23) are made of heat-conducting material and are spirally coiled on the straight tube (21).

6. The oil separator according to claim 4, characterized in that, The air outlet (31) is an inwardly concave arc-shaped structure, which matches the outer contour of the heat-conducting fins (23), thereby forming a local covering structure on the outer periphery of the heat-conducting fins (23) to increase the contact area between the high-temperature oil and gas and the return oil pipe (2).

7. The oil separator according to claim 2, characterized in that, The air inlet pipe (3) is arranged along the width direction of the cylinder (1), and the air inlet pipe (3) is perpendicular to the oil return pipe (2) so that the air outlet (31) is perpendicularly aligned with the outer wall of the oil return pipe (2).

8. The oil separator according to claim 1, characterized in that, The bottom of the cylinder (1) is provided with a filter (4), which is connected to the inlet of the return oil pipe (2). After separation, the oil flows to the filter (4), enters the return oil pipe (2) after filtration, and finally flows out from the outlet of the return oil pipe (2).

9. The oil separator according to claim 1, characterized in that, A bracket (5) is fixed on the inner wall of the cylinder (1), and the oil return pipe (2) passes through the bracket (5). The bracket (5) is used to support and fix the oil return pipe (2) to prevent the oil return pipe (2) from shaking inside the cylinder (1) due to pressure difference.

10. The oil separator according to claim 9, characterized in that, There are multiple brackets (5), and each bracket (5) is spaced apart along the length of the return oil pipe (2).

11. A compressor, characterized in that, Includes the oil separator as described in any one of claims 1-10.

12. A heat pump unit, characterized in that, Includes the compressor as described in claim 11.

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