Oil-gas separator and compressor

Abstract

This invention discloses an oil-gas separation device and compressor. The oil-gas separation device includes: a housing with a separation chamber formed inside, wherein the air inlet and oil return port of the oil-gas separation device are both connected to the separation chamber; a first filter screen disposed within the separation chamber and located between the air inlet and the oil return port; an oil return cylinder disposed within the separation chamber and located between the first filter screen and the oil return port; the cylinder wall of the oil return cylinder has air return holes, and the cylinder wall of the oil return cylinder forms an oil passage, with a first end of the oil passage facing the first filter screen and a second end facing the bottom of the separation chamber, the cross-sectional area of ​​the oil passage gradually decreasing from the first end to the second end; and an oil passing plate disposed between the first filter screen and the oil return cylinder, the oil passing plate having oil passing holes. This invention discloses an oil-gas separation device and compressor to solve the problem of low oil return efficiency in existing oil-gas separation devices.

Description

Technical Field

[0001] This invention relates to the field of refrigeration equipment technology, and more specifically, to an oil-gas separation device and a compressor. Background Technology

[0002] In screw compressors, refrigerant oil is needed for lubrication between the rotors to reduce compressor noise. The refrigerant oil also reduces gas leakage during rotor meshing, improving compressor performance. Therefore, during actual operation, the compressor discharges not only gaseous refrigerant but also tiny droplets of refrigerant oil. Screw compressor units often employ external oil-gas separators to separate the gaseous refrigerant and refrigerant oil droplets discharged from the compressor. After separation, the refrigerant oil returns to the compressor oil tank for further lubrication, while the gaseous refrigerant enters the condenser and condenses into a medium-temperature, high-pressure liquid refrigerant.

[0003] If the oil-gas separator has low separation efficiency, refrigeration oil will enter the refrigerant circulation and adhere to the heat exchange tube walls of the evaporator and condenser, forming an oil film that hinders heat exchange, reduces the heat transfer efficiency of the heat exchanger, and lowers the unit's energy efficiency. Simultaneously, insufficient oil in the compressor will lead to a lack of lubrication between components, easily damaging the compressor.

[0004] The separation mechanism of the external oil-gas separator includes centrifugal separation, gravity separation, filter adsorption separation, and collision separation. After the refrigeration oil is separated, it is collected at the bottom of the container, so a return oil pipe, a level gauge or an oil level mirror is installed at the bottom.

[0005] In the existing technology, the high gas flow rate and / or unreasonable flow field design in the oil-gas separation device will cause the gaseous refrigerant to impact the refrigeration oil collected at the bottom of the container, resulting in liquid level fluctuations and foaming, reducing the oil return efficiency of the unit's return oil pipe, and affecting the stable operation of the liquid level gauge or oil level mirror.

[0006] In summary, the high gas velocity and / or unreasonable flow field design of existing oil-gas separators cause liquid level fluctuations and foam generation, resulting in low oil return efficiency. Summary of the Invention

[0007] This invention provides an oil-gas separation device and a compressor to solve the problem of low oil return efficiency in existing oil-gas separation devices.

[0008] To achieve the above objectives, the present invention provides an oil-gas separation device, comprising: a housing, wherein a separation chamber is formed within the housing, and the air inlet and oil return port of the oil-gas separation device are both connected to the separation chamber; a first filter screen, wherein the first filter screen is disposed within the separation chamber and located between the air inlet and the oil return port; an oil return cylinder, wherein the oil return cylinder is disposed within the separation chamber and located between the first filter screen and the oil return port; the cylinder wall of the oil return cylinder has a return air hole, and the cylinder wall of the oil return cylinder forms an oil passage, wherein a first end of the oil passage faces the first filter screen, a second end of the oil passage faces the bottom of the separation chamber, and the cross-sectional area of ​​the oil passage gradually decreases from the first end to the second end; and an oil passage plate, wherein the oil passage plate is disposed between the first filter screen and the oil return cylinder, and the oil passage plate has an oil passage hole.

[0009] Furthermore, the oil passage hole of the oil passage plate includes: a first oil passage hole, which is disposed in the middle of the oil passage plate; and a plurality of second oil passage holes, which are disposed around the outer periphery of the first oil passage hole; the diameter of the first oil passage hole is larger than the diameter of the second oil passage hole.

[0010] Furthermore, the axis of the return oil cylinder is collinear with the axis of the first oil passage hole; the axis of the opening at the second end of the oil passage is collinear with the axis of the first oil passage hole.

[0011] Furthermore, there are multiple return air holes, which are arranged at the first end of the oil passage.

[0012] Furthermore, multiple air return holes are spaced apart and arranged in annular groups around the circumference of the oil return cylinder wall, with at least one annular group.

[0013] Furthermore, it also includes:

[0014] An oil baffle is provided between the second end of the oil passage and the oil return port. The oil baffle is used to prevent airflow from impacting the refrigeration oil at the bottom of the separation chamber after it is blown out from the second end of the oil passage.

[0015] Furthermore, the connecting end of the oil baffle is connected to the housing, the free end of the oil baffle is located below the connecting end of the oil baffle, and the oil baffle is inclined.

[0016] Furthermore, an oil passage notch is formed between the free end of the oil baffle and the inner wall of the housing, and the oil passage notch is located away from the oil return port.

[0017] Furthermore, there are multiple oil baffles, which are arranged in an alternating manner to form a baffle channel. After passing through the baffle channel, the refrigeration oil reaches the oil return port at the bottom of the separation chamber.

[0018] Furthermore, the oil-gas separator has an air intake channel communicating with the air inlet; the oil-passing plate is provided with a first area, the first area of ​​the oil-passing plate corresponds to the air intake channel of the oil-gas separator, and the airflow in the air intake channel impacts the first area of ​​the oil-passing plate; the oil-passing hole is provided in an area outside the first area.

[0019] Furthermore, the oil-gas separation device also includes an air inlet pipe and a second filter screen. The second filter screen is disposed in the separation chamber and forms a hollow area. The air inlet of the air inlet pipe extends into the hollow area.

[0020] The air intake channel is formed between the outer wall of the second filter and the inner wall of the separation chamber.

[0021] Furthermore, the portion of the air intake pipe that extends into the hollow region is provided with multiple air distribution holes.

[0022] Furthermore, the second filter is a cylindrical filter, and the hollow area enclosed by the second filter is a cylindrical space; the axis of the portion of the air intake pipe inserted into the hollow area is coaxial with the second filter; the air intake channel is an annular channel, and the first area is an annular area corresponding to the annular channel.

[0023] Furthermore, the oil separation device also includes an inner cylinder, which is disposed inside the separation chamber. An air intake channel is formed between the inner cylinder and the inner wall of the separation chamber, and the air inlet is disposed at the location of the air intake channel.

[0024] Furthermore, the oil-gas separation device also includes an air inlet pipe, the air inlet of which extends into the separation chamber; the oil-passing plate is provided with a first region, the air inlet of the air inlet pipe is directly facing the first region of the oil-passing plate, and the airflow from the air inlet impacts the first region of the oil-passing plate when it flows; the oil-passing hole is provided in a region outside the first region.

[0025] According to another aspect of the present invention, a compressor is provided, comprising the oil-gas separation device described above.

[0026] Furthermore, the compressor is a screw compressor.

[0027] The first filter screen is used to slow down the gas flow rate and improve the efficiency of refrigeration oil separation. Immediately after the gaseous refrigerant enters the separation chamber, the first filter screen increases the flow resistance of the gas and reduces the gas flow rate that impacts the liquid level. This plays a role in weakening the gas impact on the first layer of refrigeration oil at the bottom of the container. At the same time, the first filter screen plays a major and critical role in oil-gas separation, which can promote stable oil return.

[0028] An oil-passing plate is installed below the first filter screen, as shown in the figure. The oil-passing plate has oil-passing holes. It can accelerate the downward flow of refrigeration oil by utilizing the downward airflow, preventing refrigeration oil from accumulating in the upper part of the oil-gas separator. The oil-passing plate can increase the downward flow resistance of gas based on the first filter screen, and the resistance increase effect is stronger than that of the first filter screen. It plays a second role in reducing the impact of gas on the refrigeration oil at the bottom of the container. In conjunction with the oil-gas separation of the first filter screen and the increase in resistance, it also collects oil droplets, which can promote oil return.

[0029] The oil return cylinder has a gradually decreasing diameter cylindrical structure. This structure can collect oil droplets passing through the oil passage holes of the oil plate and reduce airflow swirl, thus promoting oil return. The vent hole is a necessary return channel for upward gas flow. The vent hole can prevent airflow from accumulating at the bottom and affecting the oil droplet fall and swirl of the liquid level. It can also prevent airflow from blowing away the refrigeration oil accumulated at the bottom, thus preventing foam formation and liquid level fluctuations.

[0030] Setting the first filter, oil return cylinder, and oil pass through plate separately cannot achieve the desired effect. The first filter, oil return cylinder, and oil pass through plate must be set up in accordance with the above-mentioned structure to realize the basic function of oil-gas separation. In addition, it can optimize the flow field (avoiding airflow directly hitting the liquid surface), reduce the downward flow of airflow, reduce the airflow disturbing the falling oil droplets, and increase the effect of oil droplet aggregation. This achieves the effect of preventing liquid level fluctuations and foaming in the oil-gas separation device, and steadily increases the oil return efficiency. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the internal structure of the oil-gas separation device according to Embodiment 1 of the present invention;

[0032] Figure 2 yes Figure 1 A partially enlarged schematic diagram of an oil-gas separation device;

[0033] Figure 3 This is a schematic diagram of the oil return cylinder of the oil-gas separation device according to Embodiment 1 of the present invention;

[0034] Figure 4 This is an enlarged schematic diagram of the oil-gas separation device according to Embodiment 1 of the present invention;

[0035] Figure 5This is a schematic diagram of the oil baffle plate of the oil-gas separation device according to Embodiment 1 of the present invention;

[0036] Figure 6 This is a schematic diagram of the internal structure of the oil-gas separation device according to Embodiment 2 of the present invention;

[0037] Figure 7 This is a schematic diagram of the air inlet pipe of the oil-gas separation device according to Embodiment 2 of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0041] Based on the problems in the background technology and objective requirements, it is necessary to develop an efficient oil-gas separation device to improve the separation efficiency of gaseous refrigerant and refrigeration oil, maintain a stable oil level at the bottom of the container under a wide operating range, ensure the unit's oil return efficiency, and ensure the stable operation of the level gauge or oil level gauge.

[0042] Embodiment 1 of the present invention

[0043] See Figures 1 to 5 As shown, according to Embodiment 1 of the present invention, an oil-gas separation device is provided. The oil-gas separation device includes a housing 10, a first filter screen 20, an oil return cylinder 30, and an oil passage plate 40. A separation chamber 11 is formed inside the housing 10. The air inlet 12 and the oil return port 13 of the oil-gas separation device are both connected to the separation chamber 11. The first filter screen 20 is disposed in the separation chamber 11 and located between the air inlet 12 and the oil return port 13.

[0044] The oil return cylinder 30 is disposed in the separation chamber 11 and located between the first filter screen 20 and the oil return port 13; the cylinder wall of the oil return cylinder 30 has a vent hole 31, and the cylinder wall of the oil return cylinder 30 forms an oil passage. The first end 30a of the oil passage faces the first filter screen 20, and the second end 30b of the oil passage faces the bottom of the separation chamber 11. The cross-sectional area of ​​the oil passage gradually decreases from the first end to the second end (gradually decreasing from the top to the bottom); the oil passage plate 40 is disposed between the first filter screen 20 and the oil return cylinder 30, and the oil passage plate 40 has an oil passage hole.

[0045] In this invention, the first filter screen 20, the oil return cylinder 30, and the oil conveying plate 40 cooperate with each other to slow down the downward flow velocity of the gas. The specific functions and working principles of the components are as follows:

[0046] The first filter 20 is used to slow down the gas flow rate and improve the efficiency of refrigeration oil separation. As soon as the gaseous refrigerant enters the separation chamber, the first filter increases the flow resistance of the gas, reduces the gas flow rate that impacts the liquid level, and plays the role of weakening the first layer of refrigeration oil at the bottom of the container. At the same time, the first filter plays the main and key role of oil-gas separation, which can promote stable oil return.

[0047] An oil-absorbing plate 40 is installed below the first filter screen 20, such as... Figure 1 As shown, the oil filter plate is equipped with oil passage holes. The oil filter plate can accelerate the downward flow of refrigeration oil using downward airflow, preventing refrigeration oil from accumulating in the upper part of the oil-gas separator. The oil filter plate 40 can increase the downward flow resistance of gas based on the first filter screen 20, and the resistance increase effect is stronger than that of the first filter screen. It plays a second role in reducing the impact of gas on the refrigeration oil at the bottom of the container. In conjunction with the oil-gas separation of the first filter screen and the increase in resistance, it can collect oil droplets and promote oil return.

[0048] The oil return cylinder 30 has a gradually decreasing diameter cylindrical structure. This structure can collect oil droplets passing through the oil passage holes of the oil passage plate 40 and reduce airflow swirling, thus promoting oil return. The vent hole 31 is a necessary return channel for upward gas flow. The vent hole 31 can prevent airflow from accumulating at the bottom and affecting the falling of oil droplets and swirling the liquid level. It can also prevent airflow from blowing away the refrigeration oil accumulated at the bottom, thus preventing foam generation and liquid level fluctuations.

[0049] The first filter screen 20, the oil return cylinder 30, and the oil pass plate 40 cannot achieve the desired effect if set up individually. The first filter screen 20, the oil return cylinder 30, and the oil pass plate 40 must be set up in accordance with the above-mentioned structure to achieve the basic function of oil-gas separation. In addition, it can optimize the flow field (avoid direct airflow hitting the liquid surface), reduce the downward flow of airflow, reduce the airflow disturbing the falling oil droplets, and increase the effect of oil droplet aggregation. This achieves the effect of preventing liquid level fluctuations and foam generation in the oil-gas separation device, and steadily increases the oil return efficiency.

[0050] Combination Figure 1 , Figure 2 , Figure 4 In the first embodiment shown, the oil passage holes of the oil-gas separator plate 40 include:

[0051] A first oil passage hole 41 is provided in the middle of the oil passage plate 40;

[0052] Multiple second oil passage holes 42 are arranged around the outer periphery of the first oil passage hole 41;

[0053] The diameter of the first oil passage hole 41 is larger than the diameter of the second oil passage hole 42.

[0054] The diameter of the first oil passage 41 is much larger than the diameter of the second oil passage 42, and the flow area of ​​the first oil passage 41 is also set to occupy a large proportion of the entire oil passage plate 40. The second oil passages 42 are regularly spaced around the outer periphery of the first oil passages 41, forming multiple annular hole groups. See [link to details] for further information. Figure 4 As shown, the combination of the shapes of the first oil passage 41 and the second oil passage 42 can accelerate the downward flow of refrigeration oil using the downward airflow, preventing refrigeration oil from accumulating on the upper part of the oil-gas separator. The first oil passage 41 primarily serves to ensure the flow rate and velocity of the downward airflow, preventing excessive accumulation of refrigeration oil. The second oil passage 42 primarily serves to collect oil droplets and increase resistance.

[0055] Combination Figures 1 to 3 As shown, in the internal structure improvement of the oil-gas separator, the axis of the return oil cylinder 30 is collinear with the axis of the first oil passage hole 41; the axis of the opening at the second end of the oil passage is collinear with the axis of the first oil passage hole 41.

[0056] In other words, the opening (bottom opening) at the second end 30b of the oil passage of the oil return cylinder 30 is directly opposite the first oil passage hole 41 (larger diameter hole) in the middle of the oil passage plate 40 above. After passing through the first oil passage hole 41, some gas directly enters the oil passage of the oil return cylinder 30, and then enters the bottom through the opening at the second end 30b of the oil passage. This direction of some airflow will promote the dripping of refrigeration oil to the bottom of the container when flowing downwards, promote the rapid dripping of refrigeration oil in the oil passage, increase the oil storage at the bottom, and improve the oil return efficiency.

[0057] Combination Figure 2 and Figure 3 As shown, there are multiple return air holes 31, which are arranged at the first end of the oil passage. Arranging multiple return air holes 31 can increase the upward speed of gas and keep the return air volume of the oil-gas separator stable.

[0058] To further optimize the gas passage effect of the return vents, the oil-gas separator in Embodiment 1 arranges multiple return vents 31 at intervals, forming an annular group around the circumference of the oil return cylinder 30 wall. The number of annular group groups is at least one. See also... Figure 3 In this embodiment, there are two sets of annular holes, which can also be adjusted according to the specific size of the return oil cylinder.

[0059] The return oil cylinder has a circumferentially arranged return air hole at the first end of the oil passage. When the oil separator is operating at high load and the gas flow rate is large, the gas is guided from the oil accumulation area at the bottom of the container back to the upper part of the container, so as to prevent the gas from flowing upward from the bottom opening of the return oil cylinder and affecting the downward dripping of the refrigeration oil.

[0060] It should be noted that the return oil cylinder in Embodiment 1 is V-shaped, or conical. Of course, in other embodiments not shown, the return oil cylinder can also be curved, meaning the rotation line of the return oil cylinder is arc-shaped. Regardless of the shape of the return oil cylinder, as long as the cross-sectional area gradually decreases from the top to the bottom, presenting an overall shrinking shape, the present invention does not impose specific limitations on its specific structure.

[0061] The oil-gas separator also includes an oil baffle plate 50, which is located between the second end of the oil passage and the oil return port 13. The oil baffle plate 50 is used to prevent the airflow from impacting the refrigeration oil at the bottom of the separation chamber 11 after it is blown out from the second end of the oil passage.

[0062] See Figure 1 The oil return cylinder 30 is provided with the aforementioned oil baffle 50. The function of the oil baffle 50 is to prevent a small amount of airflow from impacting the refrigeration oil at the bottom of the container when it flows downward through the bottom opening (30b) of the oil return cylinder.

[0063] Preferably, the connecting end 51 of the oil baffle 50 is connected to the housing 10, the free end 52 of the oil baffle 50 is located below the connecting end 51 of the oil baffle 50, and the oil baffle 50 is inclined.

[0064] In other words, the oil baffle 50 is tilted downward toward the oil accumulation area at the bottom of the separation chamber. The advantage of this setting is that it guides the refrigeration oil to the oil accumulation area, and the refrigeration oil will not accumulate at the oil baffle, effectively increasing the amount of oil accumulated.

[0065] Combination Figure 1 As shown, an oil passage gap 53 is formed between the free end 52 of the oil baffle 50 and the inner wall of the housing 10, and the oil passage gap 53 is located away from the oil return port 13.

[0066] The shape of the oil passage notch 53 formed by the free end 52 of the oil baffle 50 and the inner wall of the housing 10 (inner wall of the separation chamber) is not limited. The main consideration is that the refrigeration oil can smoothly enter the oil accumulation area. The area of ​​the oil passage notch 53 should be moderate to ensure that the refrigeration oil can quickly enter the oil accumulation area without accumulating at a predetermined flow rate. It should also ensure that some airflow will not enter the oil accumulation area from the oil passage notch 53 and impact the bottom refrigeration oil.

[0067] Furthermore, positioning the oil passage notch 53 away from the oil return port 13 has several advantages. It increases the travel length of the refrigeration oil, preventing excessively short oil flow and resulting in oil accumulation due to overly efficient separation. It also prevents some airflow from impacting the refrigeration oil at the oil return port, effectively ensuring both return efficiency and volume. Moreover, since the oil level gauge is typically located at the oil return port (oil return pipe), it provides a more accurate reading of the oil level even when airflow is blowing away the refrigeration oil. Therefore, the placement of the oil passage notch serves multiple purposes.

[0068] After passing through the oil-gas separation device, the gaseous refrigerant and refrigeration oil droplets enter the oil return pipe through the oil return port and then return to the compressor, while the gaseous refrigerant returns to the condenser through the gas outlet pipe at the top of the container.

[0069] Combination Figure 1 The present invention further improves upon the first embodiment shown to reduce the airflow velocity.

[0070] The oil-gas separator has an air intake channel 14 connected to the air inlet 12; the oil-passing plate 40 is provided with a first area, the first area of ​​the oil-passing plate 40 corresponds to the air intake channel 14 of the oil-gas separator, and the airflow in the air intake channel 14 impacts the first area of ​​the oil-passing plate 40 when it flows; the oil passage hole is provided in the area outside the first area.

[0071] After the gaseous refrigerant enters the separation chamber through the inlet 12, it enters the inlet channel 14. The airflow flowing from the inlet channel 14 towards the oil passage plate 40 will immediately impact the corresponding first area. By placing the oil passage holes in areas other than the first area, the airflow is prevented from directly impacting the oil passage holes. The absence of a solid structure in the oil passage plate slows down the airflow, increasing flow resistance and reducing airflow velocity. The design of not having holes in the first area avoids airflow impact, effectively preventing the airflow from directly passing through the oil passage holes.

[0072] The oil-gas separation device of Embodiment 1 further includes an inlet pipe 15 and a second filter 60. The second filter 60 is disposed in the separation chamber 11 and forms a hollow region 61. The inlet 12 of the inlet pipe 15 extends into the hollow region 61. An inlet channel 14 is formed between the outer wall of the second filter 60 and the inner wall of the separation chamber 11.

[0073] The direction of gas flow within the intake passage 14 is shown in the figure. Figure 1 In the direction of the arrow, the gas flowing out of the intake channel 14 will be directly blown onto the first filter screen for oil-gas separation. See also Figure 4 The oil passage hole arrangement area of ​​the oil passage plate is designed to match the position of the intake channel 14. Since the gas impact position of the intake channel 14 is located in the outermost annular area of ​​the oil passage plate 40, which belongs to the first area mentioned above, no oil passage holes are set in the first area of ​​the outermost periphery of the oil passage plate 40. Instead, oil passage holes are set and arranged in the middle of the oil passage plate 40, and are divided into the first oil passage hole and the second oil passage hole.

[0074] Furthermore, the arrangement of the first and second oil passages better coordinates with the positional relationship between the air intake channel 14 and the first area. When the air intake channel 14 impacts the first area, the gas is buffered and decelerated. Simultaneously, the refrigerant oil, after oil-gas separation at the first filter, drips from the outer periphery onto the oil passage plate. The airflow moves from the outer periphery of the oil passage plate towards the central first oil passage, carrying the refrigerant oil along with it. The refrigerant oil first passes through the area where the second oil passage is located, with most of it filtered through the second oil passage and entering the return oil cylinder. A small portion of the refrigerant oil follows the airflow from the first oil passage into the oil passage channel of the return oil cylinder. The refrigerant oil flows in a more layered manner into the return oil channel under the influence of the airflow, and the second oil passage also plays a role in oil-gas separation in the intermediate layer. This comprehensive structural coordination achieves the expected stable oil return effect. The ingenious structural design utilizes airflow to achieve unexpected technical results.

[0075] In addition, the second filter 60 not only forms the intake channel 14, but also serves as an oil-gas separator, allowing the intake air to undergo oil-gas separation directly upon entering the separation chamber. The structure of the second filter ensures that the intake air can only enter the intake channel through the second filter, which slows down the gas flow rate to a certain extent, achieving the initial effect of slowing down the gas flow rate.

[0076] If the intake pipe has only one inlet, the gas can only exit from the inlet at the bottom of the intake pipe and cannot diffuse and pass through the entire hollow area surrounded by the second filter. This results in uneven airflow distribution, with high airflow velocity at the bottom of the second filter and low airflow at the top, meaning the filter area is not fully utilized. To address this problem, this invention further improves the intake pipe.

[0077] Preferably, the portion of the intake pipe 15 extending into the hollow region 61 is provided with multiple air distribution holes 16. After the air distribution holes are circumferentially machined into the portion of the intake pipe 15 extending into the hollow region 61, the airflow can flow out from the upper air distribution holes and enter the intake channel from the upper part of the second filter screen, while also reducing the gas flow rate at the bottom intake port of the intake pipe. The airflow will be more evenly distributed within the hollow region 61 wrapped by the second filter screen, reducing the flow velocity of the lower gas passing through the second filter screen, improving separation efficiency, and making full use of the structure of the second filter screen.

[0078] In the oil separation device of Embodiment 1, the second filter screen 60 is a cylindrical filter screen, and the hollow area 61 enclosed by the second filter screen 60 is a cylindrical space;

[0079] The axis of the portion of the intake pipe 15 inserted into the hollow region 61 is coaxial with the second filter screen 60;

[0080] The intake channel 14 is a ring-shaped channel, and the first area is a ring-shaped area corresponding to the ring-shaped channel.

[0081] Considering pressure resistance, a circular casing is best, and the unit's piping, such as the intake pipe, is generally also made of circular steel pipe. Therefore, the optimal shape for the second filter is definitely cylindrical, that is, a cylindrical filter. The second filter 60 has a symmetrical structure along the circumference of the intake pipe, and the distance from the second filter to the intake pipe 360° circumference is equal, resulting in the most uniform circumferential flow field distribution.

[0082] It should be noted that, in other embodiments not shown, the second filter may also be a rectangular filter, a conical filter, or an elliptical filter. Other filter shapes take into account the different flow velocities across different circumferential areas at the same height, and also consider the structural design of the air intake channel.

[0083] The airflow velocity through the filter screen should generally be less than 0.5 m / s, and the maximum airflow velocity inside the casing should be less than 3 m / s. Therefore, different casing specifications and oil separator heights can be designed according to the cooling capacity requirements of different air conditioning units. If the unit operates under a high load, the diameter or height of the cylindrical filter screen (second filter screen) must be increased to increase the filter area. The length of the inlet pipe extension will also increase accordingly. The circumferential openings in the inlet pipe allow for uniform airflow from all heights of the extension.

[0084] The uniform air holes 16 ensure that the gas flow velocity and flow field are more uniform when the gas comes into contact with the filter screen in the vertical and circumferential directions within the cylindrical space surrounded by the cylindrical filter screen. This reduces the gas flow velocity through the filter screen, which can improve the adsorption of oil droplets by the filter screen and improve the oil-gas separation efficiency.

[0085] Embodiment 2 of the present invention

[0086] See Figure 6 and Figure 7 As shown in Embodiment 2 of the present invention, an oil-gas separation device is provided. The oil-gas separation device includes a housing 10, a first filter screen 20, an oil return cylinder 30, and an oil passage plate 40. A separation chamber 11 is formed inside the housing 10. The air inlet 12 and the oil return port 13 of the oil-gas separation device are both connected to the separation chamber 11. The first filter screen 20 is disposed in the separation chamber 11 and located between the air inlet 12 and the oil return port 13.

[0087] The oil return cylinder 30 is disposed in the separation chamber 11 and located between the first filter screen 20 and the oil return port 13; the cylinder wall of the oil return cylinder 30 has a vent hole 31, and the cylinder wall of the oil return cylinder 30 forms an oil passage. The first end 30a of the oil passage faces the first filter screen 20, and the second end 30b of the oil passage faces the bottom of the separation chamber 11. The cross-sectional area of ​​the oil passage gradually decreases from the first end to the second end (gradually decreasing from the top to the bottom); the oil passage plate 40 is disposed between the first filter screen 20 and the oil return cylinder 30, and the oil passage plate 40 has an oil passage hole.

[0088] In this invention, the first filter screen 20, the oil return cylinder 30, and the oil conveying plate 40 cooperate with each other to slow down the downward flow velocity of the gas. The specific functions and working principles of the components are as follows:

[0089] The first filter 20 is used to slow down the gas flow rate and improve the efficiency of refrigeration oil separation. As soon as the gaseous refrigerant enters the separation chamber, the first filter increases the flow resistance of the gas, reduces the gas flow rate that impacts the liquid level, and plays the role of weakening the first layer of refrigeration oil at the bottom of the container. At the same time, the first filter plays the main and key role of oil-gas separation, which can promote stable oil return.

[0090] Below the first filter screen 20, an oil-passing plate 40 is installed. The oil-passing plate has oil-passing holes. The oil-passing plate can use the downward airflow to accelerate the downward flow of refrigeration oil and prevent refrigeration oil from accumulating in the upper part of the oil-gas separator. The oil-passing plate 40 can increase the downward flow resistance of gas based on the first filter screen 20, and the resistance increase effect is stronger than that of the first filter screen. It plays a second role in reducing the impact of gas on the refrigeration oil at the bottom of the container. In conjunction with the oil-gas separation of the first filter screen and the increase in resistance, it also collects oil droplets, which can promote oil return.

[0091] The oil-gas separator has an air intake channel 14 connected to the air inlet 12; the oil-passing plate 40 is provided with a first area, the first area of ​​the oil-passing plate 40 corresponds to the air intake channel 14 of the oil-gas separator, and the airflow in the air intake channel 14 impacts the first area of ​​the oil-passing plate 40 when it flows; the oil passage hole is provided in the area outside the first area.

[0092] The oil-gas separator in Embodiment 2 has a filter assembly, which is disposed between the air inlet and the first filter 20. The filter assembly has an air inlet channel 14. The airflow flowing out of the air inlet 12 passes through the filter assembly and then flows out through the air inlet channel 14, impacting the first area of ​​the oil plate.

[0093] After the gaseous refrigerant enters the separation chamber through the inlet 12, it enters the inlet channel 14. The airflow flowing from the inlet channel 14 towards the oil passage plate 40 will immediately impact the corresponding first area. By placing the oil passage holes in areas other than the first area, the airflow is prevented from directly impacting the oil passage holes. The absence of a solid structure in the oil passage plate slows down the airflow, increasing flow resistance and reducing airflow velocity. The design of not having holes in the first area avoids airflow impact, effectively preventing the airflow from directly passing through the oil passage holes.

[0094] The oil passage plate structure, the first filter screen structure, and the oil return cylinder structure in Example 2 are basically the same as those in Example 1, and will not be described again here.

[0095] Preferably, in the oil separation device of Embodiment 2, there are multiple oil baffles 50, which are arranged in an alternating manner to form a baffle channel between them. After passing through the baffle channel, the refrigeration oil reaches the oil return port 13 at the bottom of the separation chamber 11.

[0096] See details Figure 6 Multiple oil baffles 50 with single-sided notches are interwoven to form an S-shaped baffle channel. This baffle channel further increases the fluid flow path and prevents the airflow from impacting the refrigeration oil at the bottom of the container. Furthermore, the baffle channel design makes it difficult for airflow to enter the oil accumulation area and impact the bottom refrigeration oil, allowing the airflow to flow upwards from the outlet in advance, thus stabilizing the return air volume.

[0097] Combination Figure 7 As shown, the intake pipe 15 is provided with multiple air distribution holes 16. After the air distribution holes are machined circumferentially on part of the intake pipe 15, the airflow can flow out from the upper air distribution holes, reducing the gas flow rate at the bottom intake port of the intake pipe. The airflow will be more evenly distributed in the separation chamber, reducing the flow rate of the lower gas through the filter assembly, improving the separation efficiency, and making full use of the structure of the filter assembly.

[0098] Embodiment 3 of the present invention

[0099] According to Embodiment 3 of the present invention (not shown in the figure), an oil-gas separation device is provided. The oil-gas separation device includes a housing 10, a first filter screen 20, an oil return cylinder 30, and an oil passage plate 40. A separation chamber 11 is formed inside the housing 10. The air inlet 12 and the oil return port 13 of the oil-gas separation device are both connected to the separation chamber 11. The first filter screen 20 is disposed in the separation chamber 11 and located between the air inlet 12 and the oil return port 13.

[0100] The oil return cylinder 30 is disposed in the separation chamber 11 and located between the first filter screen 20 and the oil return port 13; the cylinder wall of the oil return cylinder 30 has a vent hole 31, and the cylinder wall of the oil return cylinder 30 forms an oil passage. The first end 30a of the oil passage faces the first filter screen 20, and the second end 30b of the oil passage faces the bottom of the separation chamber 11. The cross-sectional area of ​​the oil passage gradually decreases from the first end to the second end (gradually decreasing from the top to the bottom); the oil passage plate 40 is disposed between the first filter screen 20 and the oil return cylinder 30, and the oil passage plate 40 has an oil passage hole.

[0101] In this invention, the first filter screen 20, the oil return cylinder 30, and the oil conveying plate 40 cooperate with each other to slow down the downward flow velocity of the gas. The specific functions and working principles of the components are as follows:

[0102] The first filter 20 is used to slow down the gas flow rate and improve the efficiency of refrigeration oil separation. As soon as the gaseous refrigerant enters the separation chamber, the first filter increases the flow resistance of the gas, reduces the gas flow rate that impacts the liquid level, and plays the role of weakening the first layer of refrigeration oil at the bottom of the container. At the same time, the first filter plays the main and key role of oil-gas separation, which can promote stable oil return.

[0103] Below the first filter screen 20, an oil-passing plate 40 is installed. The oil-passing plate has oil-passing holes. The oil-passing plate can use the downward airflow to accelerate the downward flow of refrigeration oil and prevent refrigeration oil from accumulating in the upper part of the oil-gas separator. The oil-passing plate 40 can increase the downward flow resistance of gas based on the first filter screen 20, and the resistance increase effect is stronger than that of the first filter screen. It plays a second role in reducing the impact of gas on the refrigeration oil at the bottom of the container. In conjunction with the oil-gas separation of the first filter screen and the increase in resistance, it also collects oil droplets, which can promote oil return.

[0104] The oil-gas separator has an air intake channel 14 connected to the air inlet 12; the oil-passing plate 40 is provided with a first area, the first area of ​​the oil-passing plate 40 corresponds to the air intake channel 14 of the oil-gas separator, and the airflow in the air intake channel 14 impacts the first area of ​​the oil-passing plate 40 when it flows; the oil passage hole is provided in the area outside the first area.

[0105] The oil separator also includes an inner cylinder, which is disposed inside the separation chamber 11. An air intake channel 14 is formed between the inner cylinder and the inner wall of the separation chamber 11, and an air inlet 12 is disposed at the location of the air intake channel 14.

[0106] In Embodiment 3, the air inlet 12 is directly disposed on the side wall of the housing, and the air inlet is located at the position of the air inlet channel 14. After the gaseous refrigerant enters from the air inlet 12, it will rotate and flow downward from the annular air inlet channel 14.

[0107] The inner cylinder has a cylindrical structure and is connected to the air outlet of the oil separator. The gas after oil-gas separation will enter the air outlet from the inside of the inner cylinder.

[0108] When the gaseous refrigerant enters through the inlet 12 and flows downwards in a rotating manner within the annular inlet channel 14, it immediately impacts the first area corresponding to the oil passage plate. By placing the oil passage holes in areas other than the first area, direct airflow impact is avoided. The absence of a physical oil passage plate structure slows the airflow, increasing flow resistance and reducing airflow velocity. The design of having no holes in the first area effectively prevents airflow impact and direct passage through the oil passage holes.

[0109] Embodiment 4 of the present invention

[0110] According to Embodiment 4 of the present invention (not shown in the figure), an oil-gas separation device is provided. The oil-gas separation device includes a housing 10, a first filter screen 20, an oil return cylinder 30, and an oil passage plate 40. A separation chamber 11 is formed inside the housing 10. The air inlet 12 and the oil return port 13 of the oil-gas separation device are both connected to the separation chamber 11. The first filter screen 20 is disposed in the separation chamber 11 and located between the air inlet 12 and the oil return port 13.

[0111] The oil return cylinder 30 is disposed in the separation chamber 11 and located between the first filter screen 20 and the oil return port 13; the cylinder wall of the oil return cylinder 30 has a vent hole 31, and the cylinder wall of the oil return cylinder 30 forms an oil passage. The first end 30a of the oil passage faces the first filter screen 20, and the second end 30b of the oil passage faces the bottom of the separation chamber 11. The cross-sectional area of ​​the oil passage gradually decreases from the first end to the second end (gradually decreasing from the top to the bottom); the oil passage plate 40 is disposed between the first filter screen 20 and the oil return cylinder 30, and the oil passage plate 40 has an oil passage hole.

[0112] In this invention, the first filter screen 20, the oil return cylinder 30, and the oil conveying plate 40 cooperate with each other to slow down the downward flow velocity of the gas. The specific functions and working principles of the components are as follows:

[0113] The first filter 20 is used to slow down the gas flow rate and improve the efficiency of refrigeration oil separation. As soon as the gaseous refrigerant enters the separation chamber, the first filter increases the flow resistance of the gas, reduces the gas flow rate that impacts the liquid level, and plays the role of weakening the first layer of refrigeration oil at the bottom of the container. At the same time, the first filter plays the main and key role of oil-gas separation, which can promote stable oil return.

[0114] Below the first filter screen 20, an oil-passing plate 40 is installed. The oil-passing plate has oil-passing holes. The oil-passing plate can use the downward airflow to accelerate the downward flow of refrigeration oil and prevent refrigeration oil from accumulating in the upper part of the oil-gas separator. The oil-passing plate 40 can increase the downward flow resistance of gas based on the first filter screen 20, and the resistance increase effect is stronger than that of the first filter screen. It plays a second role in reducing the impact of gas on the refrigeration oil at the bottom of the container. In conjunction with the oil-gas separation of the first filter screen and the increase in resistance, it also collects oil droplets, which can promote oil return.

[0115] The oil-gas separation device also includes an air inlet pipe 15, the air inlet 12 of which extends into the separation chamber 11; the oil-passing plate 40 is provided with a first area, the air inlet 12 of the air inlet pipe 15 is directly facing the first area of ​​the oil-passing plate 40, and the airflow from the air inlet 12 impacts the first area of ​​the oil-passing plate 40 when it flows; the oil-passing hole is provided in an area outside the first area.

[0116] After the gaseous refrigerant enters the separation chamber through the inlet 12, the airflow blowing out of the inlet 12 immediately impacts the first area corresponding to the oil passage plate. By placing the oil passage hole in areas other than the first area, the airflow is prevented from directly impacting the oil passage hole. This design, without a physical structure to slow down the airflow, increases flow resistance and reduces airflow velocity. The absence of an opening in the first area effectively prevents airflow from directly impacting the oil passage hole.

[0117] Embodiment 5 of the present invention

[0118] According to Embodiment 5 of the present invention (not shown in the figures), a compressor is provided, which includes the oil-gas separation device of the above embodiments.

[0119] The compressor has a high-efficiency oil-gas separation device as described in the above embodiment. The oil-gas separation device can improve the efficiency of filter screen adsorption and separation of refrigeration oil, avoid compressor oil shortage and ensure stable operation of the unit.

[0120] Meanwhile, the oil-gas separation device can stabilize oil return, and its various structures can promote the collection of refrigeration oil at the bottom of the container while preventing gas from blowing around the liquid level, thus improving the unit's oil return efficiency.

[0121] Preferably, the compressor is a screw compressor.

[0122] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0123] It should be noted that the terms "first," "second," etc., used 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 sequences other than those illustrated or described herein.

[0124] Of course, the above are preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An oil-gas separation device, characterized in that, include: The housing (10) has a separation chamber (11) formed inside it, and the air inlet (12) and oil return port (13) of the oil-gas separation device are both connected to the separation chamber (11); The first filter (20) is disposed in the separation chamber (11) and located between the air inlet (12) and the oil return port (13); An oil return cylinder (30) is disposed in the separation chamber (11) and located between the first filter screen (20) and the oil return port (13); the cylinder wall of the oil return cylinder (30) has a return air hole (31), and the cylinder wall of the oil return cylinder (30) forms an oil passage, the first end of the oil passage faces the first filter screen (20), the second end of the oil passage faces the bottom of the separation chamber (11), and the cross-sectional area of ​​the oil passage gradually decreases from the first end to the second end; An oil-passing plate (40) is disposed between the first filter screen (20) and the oil return cylinder (30), and the oil-passing plate (40) has oil-passing holes. The oil passage hole of the oil passage plate (40) includes: a first oil passage hole (41), which is disposed in the middle of the oil passage plate (40); Multiple second oil passage holes (42) are arranged around the outer periphery of the first oil passage hole (41); the diameter of the first oil passage hole (41) is larger than the diameter of the second oil passage hole (42); The oil-gas separator has an air intake channel (14) connected to the air inlet (12); the oil-passing plate (40) is provided with a first area, the first area of ​​the oil-passing plate (40) corresponds to the air intake channel (14) of the oil-gas separator, and the airflow in the air intake channel (14) impacts the first area of ​​the oil-passing plate (40); the oil-passing hole is provided in an area outside the first area. The oil-gas separation device further includes an air inlet pipe (15) and a second filter screen (60). The second filter screen (60) is a cylindrical filter screen, and the hollow area (61) enclosed by the second filter screen (60) is a cylindrical space. The axis of the part of the air inlet pipe (15) inserted into the hollow area (61) is coaxial with the second filter screen (60). The air inlet channel (14) is an annular channel, and the first area is an annular area corresponding to the annular channel.

2. The oil-gas separation device according to claim 1, characterized in that, The axis of the return oil cylinder (30) is collinear with the axis of the first oil passage (41); The axis of the opening at the second end of the oil passage is collinear with the axis of the first oil passage (41).

3. The oil-gas separation device according to claim 1, characterized in that, There are multiple air return holes (31), and the multiple air return holes (31) are arranged at the first end of the oil passage.

4. The oil-gas separation device according to claim 3, characterized in that, Multiple air return holes (31) are spaced apart and arranged in annular groups around the circumference of the oil return cylinder (30) wall, and the number of annular groups is at least one.

5. The oil-gas separation device according to claim 1, characterized in that, Also includes: An oil baffle (50) is provided between the second end of the oil passage and the oil return port (13). The oil baffle (50) is used to prevent the airflow from blowing out from the second end of the oil passage and impacting the refrigeration oil at the bottom of the separation chamber (11).

6. The oil-gas separation device according to claim 5, characterized in that, The connecting end (51) of the oil baffle (50) is connected to the housing (10), and the free end (52) of the oil baffle (50) is located below the connecting end (51) of the oil baffle (50). The oil baffle (50) is inclined.

7. The oil-gas separation device according to claim 6, characterized in that, An oil passage notch (53) is formed between the free end (52) of the oil baffle (50) and the inner wall of the housing (10), and the oil passage notch (53) is located away from the oil return port (13).

8. The oil-gas separation device according to claim 5, characterized in that, The number of oil baffles (50) is multiple, and the multiple oil baffles (50) are arranged in an alternating manner, forming a baffle channel between the multiple oil baffles (50). After passing through the baffle channel, the refrigeration oil reaches the oil return port (13) at the bottom of the separation chamber (11).

9. The oil-gas separation device according to claim 1, characterized in that, The second filter (60) is disposed in the separation chamber (11), and the second filter (60) forms a hollow region (61). The air inlet (12) of the air inlet pipe (15) extends into the hollow region (61). The air intake channel (14) is formed between the outer wall of the second filter (60) and the inner wall of the separation chamber (11).

10. The oil-gas separation device according to claim 9, characterized in that, The portion of the air intake pipe (15) that extends into the hollow region (61) is provided with multiple air distribution holes (16).

11. The oil-gas separation device according to claim 1, characterized in that, The oil-gas separation device also includes an inner cylinder, which is disposed inside the separation chamber (11). An air inlet channel (14) is formed between the inner cylinder and the inner wall of the separation chamber (11), and an air inlet (12) is disposed at the location of the air inlet channel (14).

12. The oil-gas separation device according to claim 1, characterized in that, The oil-gas separation device also includes an air inlet pipe (15), the air inlet (12) of which extends into the separation chamber (11); The air inlet (12) of the air inlet pipe (15) is directly opposite the first area of ​​the oil-passing plate (40), and the airflow from the air inlet (12) impacts the first area of ​​the oil-passing plate (40) when it flows.

13. A compressor, characterized in that, The oil-gas separation device includes any one of claims 1 to 12.

14. The compressor according to claim 13, characterized in that, The compressor is a screw compressor.

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