Oil and gas separator and gas compression system

Abstract

Embodiments of the present disclosure provide an oil-gas separator and a gas compression system. The oil-gas separator comprises an outer cylinder, a fluid conveying pipe and an inner cylinder. A side wall of the outer cylinder is provided with a fluid inlet communicating with a first inner cavity. An output end of the fluid conveying pipe communicates with the first inner cavity through the fluid inlet. The inner cylinder is arranged in the first inner cavity, a top end of the inner cylinder is connected with a top end of the outer cylinder, a bottom end of the inner cylinder is open to make a second inner cavity of the inner cylinder communicate with the first inner cavity, an outer peripheral surface of the inner cylinder has an annular gap communicating with the fluid inlet between the outer peripheral surface and an inner peripheral surface of the outer cylinder, and a part of a side wall of the inner cylinder close to the fluid inlet is inwardly recessed to form a relief portion, the relief portion avoiding an extension space of the output end in a flow direction of the oil-gas mixed fluid. In this way, the oil-gas separation efficiency can be improved.

Description

Technical Field

[0001] The exemplary embodiments disclosed herein generally relate to the field of oil-gas separation technology, and particularly to an oil-gas separator and a gas compression system. Background Technology

[0002] Oil-gas separators are used to separate oil and gas from an oil-gas mixture. Taking an oil-gas separator used in a gas compression system as an example, it can separate lubricating oil and compressed gas from an oil-gas mixture. However, the separation efficiency of traditional oil-gas separators still needs to be improved. Utility Model Content

[0003] The purpose of this disclosure is to provide an oil-gas separator and a gas compression system to solve or at least partially solve the aforementioned problems and / or other potential problems existing in conventional oil-gas separators.

[0004] In a first aspect of this disclosure, an oil-gas separator is provided. The oil-gas separator includes: an outer cylinder having a first inner cavity, a fluid inlet communicating with the first inner cavity on a side wall of the outer cylinder; a fluid delivery pipe having an output end communicating with the first inner cavity through the fluid inlet, the fluid delivery pipe being configured to deliver an oil-gas mixture to the first inner cavity via the fluid inlet; and an inner cylinder disposed within the first inner cavity, the top end of the inner cylinder being connected to the top end of the outer cylinder, the bottom end of the inner cylinder being open to allow a second inner cavity of the inner cylinder to communicate with the first inner cavity, an annular gap communicating with the fluid inlet being formed between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the outer cylinder, and a portion of the inner cylinder's side wall near the fluid inlet being recessed inward to form a clearance portion, the clearance portion clearing the extension space of the output end in the inflow direction of the oil-gas mixture.

[0005] In some embodiments, the vertical dimension of the output terminal is greater than its horizontal dimension.

[0006] In some embodiments, the fluid transport pipeline includes a first pipe section and a second pipe section, one end of the first pipe section forms an output end, the other end of the first pipe section is connected to the second pipe section, and the cross-sectional area of ​​the first pipe section is larger than the cross-sectional area of ​​the second pipe section.

[0007] In some embodiments, the fluid transport pipeline further includes a third pipe segment located between the first pipe segment and the second pipe segment, wherein the cross-sectional area of ​​the third pipe segment is greater than the cross-sectional area of ​​the second pipe segment, and the cross-sectional area of ​​the first pipe segment is greater than or equal to the cross-sectional area of ​​the third pipe segment.

[0008] In some embodiments, the end face of the output end is close to the inner periphery of the fluid inlet, and / or the inflow direction of the oil-gas mixture is parallel to the tangential direction of the cross-section of the outer cylinder.

[0009] In some embodiments, the system further includes an oil separator core disposed in the second inner cavity and an exhaust pipe connected to the oil separator core.

[0010] In some embodiments, the side wall of the outer cylinder is provided with an exhaust port, one end of the exhaust pipe is connected to the oil separator core, and the other end of the exhaust pipe is connected to the exhaust port.

[0011] In some embodiments, the exhaust pipe includes a fourth pipe segment and a fifth pipe segment. The fourth pipe segment extends vertically near the centerline of the outer cylinder. The top end of the fourth pipe segment is connected to the oil separator core. The bottom end of the fourth pipe segment extends to a position near the exhaust port and is connected to one end of the fifth pipe segment. The fifth pipe segment extends laterally, and the other end of the fifth pipe segment is connected to the exhaust port.

[0012] In some embodiments, the clearance portion includes a groove formed by an inward recess of a portion of the inner cylinder's sidewall near the fluid inlet. The groove includes a bottom wall and a first sidewall and a second sidewall that are vertically opposite each other. The first sidewall is connected to the upper edge of the bottom wall and is inclined toward the top of the inner cylinder. The second sidewall is connected to the lower edge of the bottom wall and is inclined toward the bottom of the inner cylinder.

[0013] In a second aspect of this disclosure, a gas compression system is provided. The gas compression system includes an oil-gas separator as described in the first aspect and a compressor unit, wherein the fluid outlet of the compressor unit is connected to the inlet of a fluid delivery pipe of the oil-gas separator.

[0014] It should be understood that the content described in this content section is not intended to limit the key or essential features of the embodiments of this disclosure, nor is it intended to restrict the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0015] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements, wherein: Figure 1 A side view of an oil-gas separator according to some embodiments of this disclosure is shown; Figures 2 to 4 Cross-sectional views of oil-gas separators according to some embodiments of this disclosure are shown from different perspectives; Figure 5 A perspective view of an inner cylinder according to some embodiments of the present disclosure is shown; Figure 6 and Figure 7 Cross-sectional views of fluid transport pipes according to some embodiments of the present disclosure are shown from different perspectives; and Figure 8A schematic diagram of an example system architecture for a gas compression system according to some embodiments of the present disclosure is shown.

[0016] Explanation of reference numerals in the attached figures: 100-Oil-gas separator; 110-Outer cylinder; 111-First inner cavity; 112-Fluid inlet; 113-Exhaust port; 114-Oil outlet; 115-Annular gap; 120-Inner cylinder; 121-Second inner cavity; 122-Allowing section; 123-Bottom wall of the tank; 124-First tank side wall; 125-Second tank side wall; 130-Fluid conveying pipe; 131-Output end; 132-First pipe section ; 133, 136 - Transition section; 134 - Second pipe section; 135 - Third pipe section; 136, 137 - Semi-circular edge; 138, 139 - Straight edge; 140 - Oil separator core; 141 - Third inner cavity; 150 - Exhaust pipe; 151 - Fourth pipe section; 152 - Fifth pipe section; 153 - Air inlet; 160 - Oil delivery pipe; 170 - Drain pipe; 171 - Casing; 172 - Drain port; and 200 - Gas compression system; 210 - Compressor unit; 211 - Compressor main unit; 212 - Engine; 220 - Cooler; 230 - Air filter. Detailed Implementation

[0017] Preferred embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0018] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects.

[0019] As mentioned earlier, oil-gas separators are used to separate oil and gas in an oil-gas mixture. Taking an oil-gas separator used in a gas compression system as an example, it can separate lubricating oil and compressed gas from an oil-gas mixture. An oil-gas separator typically consists of an outer cylinder and an inner cylinder housed within the outer cylinder, forming an annular gap between them. During operation, the oil-gas mixture is introduced into this annular gap through an inlet. The annular gap guides the oil-gas mixture to rotate and fall, achieving oil-gas separation under centrifugal force. However, in traditional oil-gas separators, the flow velocity of the oil-gas mixture is relatively high, and it easily interferes with the outer circumference of the inner cylinder, causing fluid turbulence and thus affecting the separation efficiency of the oil-gas separator.

[0020] To address, or at least partially address, the aforementioned problems or other potential problems existing in conventional technologies, embodiments of this disclosure provide an improved oil-gas separator. In this improved separator, the oil-gas separator includes an outer cylinder, an inner cylinder, and a fluid delivery pipe. The outer cylinder has a first inner cavity, and its sidewall has a fluid inlet communicating with the first inner cavity. The output end of the fluid delivery pipe communicates with the first inner cavity through the fluid inlet, and the fluid delivery pipe is configured to deliver an oil-gas mixture to the first inner cavity via the fluid inlet. The inner cylinder is disposed within the first inner cavity, its top end connected to the top end of the outer cylinder, and its bottom end open to allow a second inner cavity to communicate with the first inner cavity. An annular gap communicating with the fluid inlet exists between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the outer cylinder. A portion of the inner cylinder's sidewall near the fluid inlet is recessed inward to form a clearance portion, which avoids the extension space of the output end in the inflow direction of the oil-gas mixture.

[0021] According to embodiments of the present disclosure, the oil-gas separator features an inwardly recessed clearance portion formed by the inner cylinder's sidewall near the fluid inlet. This clearance portion allows for clearance of the extended space at the input end in the direction of the oil-gas mixture's inflow. This allows the inner cylinder to avoid interference between the oil-gas mixture and the inner cylinder, thus guiding the oil-gas mixture to smoothly rotate and fall along the annular gap. Furthermore, by providing the clearance portion, the space at the fluid inlet is increased, which helps reduce the flow velocity of the oil-gas mixture and improves the separation efficiency of the oil-gas separator.

[0022] Figure 1 A side view of an oil-gas separator 100 according to some embodiments of the present disclosure is shown. Figures 2 to 4 Cross-sectional views of an oil-gas separator 100 according to some embodiments of this disclosure are shown from different perspectives. Specifically, Figure 2It can be a cross-sectional view of the oil-gas separator 100 taken vertically (or longitudinally) along the centerline of the fluid transport pipeline 130 (e.g., the centerline of the second pipe section 134). Figure 3 It can be a cross-sectional view of the oil-gas separator 100 taken vertically along the axis of the outer cylinder 110. Figure 4 It can be a cross-sectional view of the oil-gas separator 100 taken along the transverse direction at the centerline of the fluid transport pipeline 130. Figure 5 A perspective view of the inner cylinder 120 according to some embodiments of the present disclosure is shown. See also Figures 1 to 5 As shown, the oil-gas separator 100 of the embodiments of this disclosure may include an outer cylinder 110, an inner cylinder 120, and a fluid conveying pipeline 130. The various components of the oil-gas separator 100 will be described below with reference to the accompanying drawings and examples.

[0023] The outer cylinder 110 has a first inner cavity 111 inside, and a fluid inlet 112 communicating with the first inner cavity 111 is provided on the side wall of the outer cylinder 110. In some embodiments, the outer cylinder 110 may include a cylindrical or approximately cylindrical side wall, a top wall connected to the top end of the side wall, and a bottom wall connected to the bottom end of the side wall. This allows for the formation of a cylindrical or approximately cylindrical first inner cavity 111, which facilitates guiding the oil-gas mixture to rotate and fall, thereby improving oil-gas separation efficiency. In some embodiments, the fluid inlet 112 may be located near the top end of the outer cylinder 110. This increases the distance between the fluid inlet 112 and the bottom surface of the first inner cavity 111, extending the fluid flow path and further improving oil-gas separation efficiency.

[0024] The output end 131 of the fluid delivery pipe 130 is connected to the first inner cavity 111 through the fluid inlet 112, enabling the fluid delivery pipe 130 to deliver an oil-gas mixture into the first inner cavity 111 via the fluid inlet 112. In some embodiments, the inflow direction of the oil-gas mixture can be parallel to the tangential direction of the cross-section of the outer cylinder 110. In this way, the oil-gas mixture can flow into or approximately flow into the annular gap 115 along the tangential direction of the outer cylinder 110, which is beneficial for guiding the oil-gas mixture to smoothly rotate and fall along the annular gap 115, thereby improving the oil-gas separation efficiency. Of course, the above-mentioned inflow direction is only exemplary, and any other appropriate inflow direction can be selected according to actual needs. Furthermore, the specific structure of the fluid delivery pipe 130 will not be described here, but will be described in detail below with reference to examples and drawings.

[0025] The inner cylinder 120 is disposed within the first inner cavity 111. The top end of the inner cylinder 120 is connected to the top end of the outer cylinder 110, and the bottom end of the inner cylinder 120 is open, allowing the second inner cavity 121 of the inner cylinder 120 to communicate with the first inner cavity 111. In this way, gas separated from the oil-gas mixture can enter the second inner cavity 121 from the bottom end of the inner cylinder 120. Subsequently, it is discharged outside the oil-gas separator 100 through, for example, an exhaust pipe 150.

[0026] An annular gap 115 communicating with the fluid inlet 112 is provided between the outer peripheral surface of the inner cylinder 120 and the inner peripheral surface of the outer cylinder 110. In some embodiments, combined with Figure 4 and Figure 5 As shown, the inner cylinder 120 can be cylindrical or approximately cylindrical. The centerline of the inner cylinder 120 can coincide with the centerline of the outer cylinder 110. In this way, a gap of constant width can be formed between the outer cylinder 110 and the inner cylinder 120, which is conducive to the smooth flow of fluid and thus improves the oil-gas separation efficiency.

[0027] The inner cylinder 120 has an inwardly recessed sidewall near the fluid inlet 112 to form a clearance portion 122, which avoids the extension space of the output end 131 in the inflow direction. The extension space can be understood as (assuming) the space (e.g., a cylindrical space) defined by the outer periphery of the output end 131 within the first inner cavity 111 during the translation of the end face (or longitudinal section) into the first inner cavity 111 along the inflow direction. Alternatively, the extension space can be understood as the space defined by the projection of the end face of the output end 131 along the inflow direction.

[0028] In some embodiments, the longitudinal section of the output end 131 has a larger vertical dimension than its transverse dimension. In this case, the longitudinal section of the extension space also has a larger transverse dimension. In this way, the oil-gas mixture can flow into the annular gap 115 at a position and shape that is closer to the inner circumferential surface of the outer cylinder 110, which can cause the oil-gas mixture to rotate and fall along the inner circumferential surface of the outer cylinder 110, thereby improving the oil-gas separation efficiency.

[0029] Figure 6 A cross-sectional view of a fluid delivery conduit 130 according to some embodiments of the present disclosure is shown. Specifically, Figure 6 This could be a cross-sectional view of the fluid delivery pipe 130 taken vertically near the output end 131. As an example, combined with... Figure 3 and Figure 6As shown, the longitudinal section (i.e., the vertical section) of the output end 131 can be circular like a racetrack. If the inflow direction is parallel to the tangent of the cross-section (i.e., the transverse section) of the outer cylinder 110, the longitudinal section of the extended space can also be circular like a racetrack. The circular racetrack includes two opposing semicircular sides 136 and 137 and two parallel and opposing straight sides 138 and 139, which together define a shape approximating a "track". The vertical width of the longitudinal section of the output end 131 can be L1, and the transverse width can be L2, where L1 > L2. Constructing the longitudinal section of the output end 131 as a circular racetrack ensures that the vertical dimension of the output end 131 is greater than its transverse dimension, and also ensures that the inner circumferential surface of the output end 131 is smooth and fluid, which is beneficial for maintaining the flow stability of the oil-gas mixture. It should be understood that the longitudinal section of the output end 131 is not limited to a racetrack circle, and the output end 131 of the fluid conveying pipe 130 can be constructed into any other suitable shape, such as a circle, rectangle, or ellipse, etc., according to actual needs. Correspondingly, the extension space can also be any other suitable shape. The embodiments of this disclosure do not limit this.

[0030] The avoidance portion 122 avoiding the extended space should be understood as at least avoiding the extended space. In some embodiments, the shape of the avoidance portion 122 may match the shape of the output end 131 of the fluid delivery conduit 130. Alternatively, the avoidance space provided by the avoidance portion 122 may be larger than the extended space. In some embodiments, combined with Figures 2 to 5 As shown, the inner cylinder 120 can be recessed inward on the side wall near the fluid inlet 112, thereby forming a groove on the outer periphery of the inner cylinder 120 to form a clearance portion 122.

[0031] As an example, continue to combine Figures 2 to 5As shown, the groove may include a bottom wall 123 and a first side wall 124 and a second side wall 125 that are vertically opposite each other. The bottom wall 123 may be rectangular, for example, and the plane containing the bottom wall 123 may be parallel to the flow direction. The first side wall 124 and the second side wall 125 may be vertically opposite each other. The first side wall 124 may be connected to the upper edge of the bottom wall 123, and the first side wall 124 may be inclined towards the top of the inner cylinder 120. The second side wall 125 may be connected to the lower edge of the bottom wall 123, and the second side wall 125 may be inclined towards the bottom of the inner cylinder 120. In this way, a groove with a trapezoidal or approximately trapezoidal longitudinal section can be formed on the outer periphery of the inner cylinder 120, through which an extended space with, for example, a racetrack-shaped longitudinal section can be avoided. It should be noted that the above-described avoidance part 122 is only exemplary, and the avoidance part 122 can be constructed into any other suitable shape according to actual needs. For example, the longitudinal section of the clearance portion 122 may also be rectangular or semi-circular, etc. The embodiments disclosed herein are not limited in this respect.

[0032] The structure of the fluid delivery conduit 130 will be described exemplarily below with reference to the accompanying drawings. In some embodiments, in conjunction with... Figure 2 and Figure 4 As shown, the fluid transport pipeline 130 may include a first pipe section 132 and a second pipe section 134. One end of the first pipe section 132 may be connected to the first inner cavity 111 via a fluid inlet 112 to form the output end 131 of the fluid transport pipeline 130. The other end of the first pipe section 132 may be connected to the second pipe section 134. The cross-sectional area of ​​the first pipe section 132 may be larger than the cross-sectional area of ​​the second pipe section 134. In this way, the flow velocity of the oil-gas mixture will decrease after flowing from the second pipe section 134 into the first pipe section 132, thereby reducing the flow velocity of the oil-gas mixture into the first inner cavity 111, which is beneficial to improving the oil-gas separation efficiency.

[0033] As an example, the longitudinal section of the first pipe segment 132 can be circular, and the longitudinal section of the second pipe segment 134 can also be circular. The other end of the first pipe segment 132 can be connected to the second pipe segment 134 via, for example, a transition section. For example, one end of the transition section can be circular, and the other end can be circular. Alternatively, both the longitudinal sections of the first pipe segment 132 and the second pipe segment 134 can be circular, and the first pipe segment 132 can be connected to the second pipe segment 134 via a frustum-shaped transition section. Of course, the above-described fluid transport pipe 130 is merely exemplary.

[0034] In some embodiments, combined with Figure 2 and Figure 4As shown, the fluid transport pipeline 130 may further include a third pipeline section 135 located between the first pipeline section 132 and the second pipeline section 134. The cross-sectional area of ​​the third pipeline section 135 is larger than that of the second pipeline section 134, and the cross-sectional area of ​​the first pipeline section 132 is greater than or equal to that of the third pipeline section 135. Therefore, the flow velocity of the oil-gas mixture decreases after flowing from the second pipeline section 134 into the third pipeline section 135, and then it can be stably or further reduced in flow velocity and introduced into the first inner cavity 111 through the first pipeline section 132, which is beneficial for improving oil-gas separation efficiency. Moreover, in practical applications, the flow velocity of the oil-gas mixture can be accurately controlled by configuring the cross-sectional areas of the second pipeline section 134 and the third pipeline section 135.

[0035] Figure 7 A cross-sectional view of a portion of a fluid transport conduit 130 according to some embodiments of the present disclosure is shown. Specifically, Figure 7 A cross-sectional view of the fluid transport pipe 130, cut transversely, is shown. (Combined) Figures 2 to 4 as well as Figures 6 to 7 As shown, the longitudinal section of the first pipe segment 132 can be circular like a racetrack. One end of the first pipe segment 132 can be connected to the first inner cavity 111 via the fluid inlet 112 to form the output end 131 of the fluid conveying pipe 130. The other end of the first pipe segment 132 can be connected to one end of the third pipe segment 135 via the transition section 133. The longitudinal sections of both the second pipe segment 134 and the third pipe segment 135 can be circular, and the diameter of the third pipe segment 135 can be larger than the diameter of the second pipe segment 134. The other end of the third pipe segment 135 can be connected to one end of the second pipe segment 134 via the transition section 136, which can be frustum-shaped. In this way, the flow velocity of the oil-gas mixture from the second pipe section 134 to the third pipe section 135 will decrease, and then it will flow from the third pipe section 135 to the first pipe section 132, so as to adjust the cross-sectional shape of the oil-gas mixture and allow the oil-gas mixture to flow from the inner circumferential surface near the outer cylinder 110 into the annular gap 115, thereby improving the oil-gas separation efficiency.

[0036] In some embodiments, combined with Figure 4 and Figure 7 As shown, the end face of the output end 131 is close to the inner periphery of the fluid inlet 112. In this way, the size of the fluid delivery pipe 130 extending into the annular gap 115 can be reduced, and interference between the fluid delivery pipe 130 and the fluid in the annular gap 115 can be avoided. As an example, such as... Figure 7As shown, the output end 131 can be wedge-shaped, and its end face can be in contact with the inner circumferential surface of the inner cylinder 120. Alternatively, the output end 131 can have an arc-shaped end face that matches the inner circumferential surface of the outer cylinder 110. In this way, the end face of the output end 131 can be flush with the inner circumferential surface of the outer cylinder 110, which can minimize interference between the fluid delivery pipe 130 and the fluid in the annular gap 115. It should be understood that the above-described fluid delivery pipe 130 is merely exemplary, and any other suitable fluid delivery pipe 130 can be selected according to actual needs. The embodiments of this disclosure are not limited in this respect.

[0037] The exhaust structure and oil supply structure will be described exemplarily below with reference to the accompanying drawings. In some embodiments, combined with Figure 3 As shown, the oil-gas separator 100 may further include an oil separator core 140 disposed in the second inner cavity 121 and an exhaust pipe 150 connected to the oil separator core 140. After the oil-gas mixture rotates and falls below the inner cylinder 120 along the annular gap 115, the oil continues to fall along the inner circumferential surface of the outer cylinder 110 to the bottom of the first inner cavity 111. Due to the lower density of the gas, it flows into the second inner cavity 121 under pressure. The oil separator core 140 can perform secondary oil-gas separation, which can improve the cleanliness of the gas and increase the oil recovery rate.

[0038] As an example, combined Figure 3 As shown, the top end of the oil separator core 140 can be connected to the top end of the outer cylinder 110, and the interior of the oil separator core 140 can have a third inner cavity 141. The bottom end of the oil separator core 140 can be sealed by a structure such as a baffle or a shell. One end of the exhaust pipe 150 can extend into and communicate with the third inner cavity 141. In this way, the gas after secondary oil-gas separation can enter the third inner cavity 141 and be discharged through the exhaust pipe 150.

[0039] In some embodiments, combined with Figures 1 to 3 As shown, the side wall of the outer cylinder 110 can be provided with an exhaust port 113, for example, the exhaust port 113 can be located slightly above the middle, in the middle, or slightly below the middle of the side wall. One end of the exhaust pipe 150 is connected to the oil separator core 140, and the other end of the exhaust pipe 150 is connected to the exhaust port 113. In this way, gas can be guided to the side of the outer cylinder 110 for discharge through the exhaust pipe 150. The external gas supply pipe can be connected from the side of the outer cylinder 110 to the exhaust port 113, which can reduce the vertical size of the oil-gas separator 100 and improve the portability of the oil-gas separator 100.

[0040] In some embodiments, combined with Figure 3As shown, the exhaust port 113 can be positioned near the bottom of the outer cylinder 110. The exhaust pipe 150 may include a fourth pipe section 151 and a fifth pipe section 152. The fourth pipe section 151 can extend vertically near the axis of the outer cylinder 110. The top end of the fourth pipe section 151 can be connected to the oil separator core 140, and the bottom end of the fourth pipe section 151 can extend to a position near the exhaust port 113 (e.g., near the middle or slightly below the middle of the side wall). The bottom end of the fourth pipe section 151 can be connected to one end of the fifth pipe section 152, for example, through an arc-shaped transition section. The fifth pipe section 152 can extend laterally, and the other end of the fifth pipe section 152 can communicate with the exhaust port 113. In this way, the interference of the exhaust pipe 150 on the oil-gas separation process can be reduced, which not only reduces the height of the oil-gas separator 100 but also ensures the separation effect of the oil-gas separator 100. It should be noted that the exhaust pipe 150 can be an integral structure or a split structure. For example, a fourth pipe section 151 and a fifth pipe section 152 can be formed by bending a single exhaust pipe 150.

[0041] As an example, the top end of the fourth pipe segment 151 can extend into the third inner cavity 141 and connect to the top end of the outer cylinder 110. The portion of the fourth pipe segment 151 extending into the third inner cavity 141 can be provided with one or more air inlets 153. The bottom end of the fourth pipe segment 151 can extend along the axis of the outer cylinder 110 to a position near the bottom end of the outer cylinder 110. One end of the fifth pipe segment 152 can connect to the bottom end of the fourth pipe segment 151, and the other end of the fifth pipe segment 152 can extend radially along the outer cylinder 110 and connect to the exhaust port 113.

[0042] In some embodiments, combined with Figures 1 to 3 As shown, the outer cylinder 110 may be provided with a vent 172 on its side wall. The oil-gas separator 100 may also include a vent pipe 170. One end of the vent pipe 170 may be connected to the third inner cavity 141, and the other end of the vent pipe 170 may be connected to the vent 172 or extend to the outside of the outer cylinder 110 via the vent 172. In this way, in some cases, the oil accumulated at the bottom of the oil separator core 140 can be vented through the vent pipe 170, avoiding excessive oil content in the gas in the third inner cavity 141, which helps to ensure the separation efficiency of the oil-gas separator 100.

[0043] As an example, the bottom end of the oil separator core 140 may be provided with a sleeve 171, and a fourth pipe section 151 may extend from the sleeve 171 into the third inner cavity 141. A gap may exist between the outer circumferential surface of the fourth pipe section 151 and the inner circumferential surface of the sleeve 171. The bottom end of the sleeve 171 may be sealed to the fourth pipe section 151, and the top end of the sleeve 171 may extend into and communicate with the third inner cavity 141. An opening may be provided on the side of the sleeve 171, through which a drain pipe 170 may communicate with the sleeve 171. Of course, the drain pipe 170 and the oil separator core 140 may also be connected by any other suitable structure, and the embodiments of this disclosure are not limited in this regard.

[0044] In some embodiments, the side wall of the outer cylinder 110 may also be provided with an oil drain port 114, for example, the oil drain port 114 is located near the middle of the outer cylinder 110 in the vertical direction. The oil-gas separator 100 may also include an oil delivery pipe 160, the bottom end of which may be close to the bottom end of the first inner cavity 111, and the other end of which may be connected to the oil drain port 114, or extend outside the outer cylinder 110 via the oil drain port 114. The separated oil can be discharged outside the oil-gas separator 100 using the oil delivery pipe 160.

[0045] During the operation of the oil-gas separator 100, an oil-gas mixture (e.g., a mixture of lubricating oil and compressed air) can be transported through the fluid delivery pipe 130 to the annular gap 115 between the outer cylinder 110 and the inner cylinder 120. Because the outer periphery of the inner cylinder 120 is provided with a clearance portion 122, interference between the oil-gas mixture and the inner cylinder 120 can be prevented to a certain extent, and the velocity of the oil-gas mixture is reduced. Afterward, the oil-gas mixture can rotate and fall along the annular gap 115.

[0046] After the oil-gas mixture falls below the inner cylinder 120, the oil continues to rotate and fall along the inner circumferential surface of the outer cylinder 110 to the bottom of the first inner cavity 111. Due to the relatively low density of the gas, it enters the second inner cavity 121 under pressure to achieve oil-gas separation. Of course, the gas entering the second inner cavity 121 may still contain a certain amount of oil. A secondary oil-gas separation can be performed using the oil separator 140, and the gas after secondary oil-gas separation is discharged through the exhaust pipe 150. The separated oil can be discharged through the oil supply pipe 160, for example, to be supplied to the compressor unit for recycling.

[0047] Embodiments of this disclosure also provide a gas compression system 200. Figure 8 A schematic diagram of an example system architecture for a gas compression system 200 according to an embodiment of the present disclosure is shown. (In conjunction with...) Figure 8As shown, the gas compression system 200 of this disclosure embodiment may include the oil-gas separator 100 and compressor unit as described in any of the above embodiments. The fluid outlet of the compressor unit may be connected to the inlet of the fluid delivery pipe 130 of the oil-gas separator 100. Since the oil-gas separator 100 described above has a relatively high oil-gas separation efficiency, the cleanliness of the exhaust gas and the lubricating oil recovery rate of the gas compression system 200 can be improved by using the oil-gas separator 100 described above.

[0048] In some embodiments, continue to combine Figure 8 As shown, the gas compression system 200 may further include an air filter 230 and a cooler 220. The compressor unit 210 may include a compressor main unit 211 and an engine 212, such as a fuel engine or electric motor, driven by the compressor main unit 211. The outlet of the air filter 230 may be connected to the inlet of the compressor main unit 211, and the fluid outlet of the compressor main unit 211 may be connected to the inlet of the fluid delivery pipe 130130. The oil delivery pipe 160 of the oil-gas separator 100 may be connected to the cooler 220; for example, the oil delivery pipe 160 of the oil-gas separator 100 may be connected to the oil inlet of the cooler 220 via one or more oil filters. The oil outlet of the cooler 220 may be connected to the oil return port of the compressor main unit 211.

[0049] During the operation of the gas compression system 200, air is filtered using air filter 220 to improve the cleanliness of the intake air. The filtered air is then supplied to the compressor main unit 211. The compressor main unit 211 is driven by the engine 212 to compress the air. The oil-gas mixture discharged from the compressor main unit 211 enters an oil-gas separator for separation to obtain clean compressed air. The recovered lubricating oil can be cooled by a cooler and then recycled back to the compressor main unit 211.

[0050] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technological improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An oil-gas separator, characterized in that, include: The outer cylinder has a first inner cavity inside, and the side wall of the outer cylinder is provided with a fluid inlet communicating with the first inner cavity; A fluid delivery pipeline, the output end of which is connected to the first inner cavity through the fluid inlet, is configured to deliver an oil-gas mixture fluid to the first inner cavity via the fluid inlet; as well as An inner cylinder is disposed in the first inner cavity. The top end of the inner cylinder is connected to the top end of the outer cylinder. The bottom end of the inner cylinder is open so that the second inner cavity of the inner cylinder communicates with the first inner cavity. There is an annular gap between the outer circumferential surface of the inner cylinder and the inner circumferential surface of the outer cylinder, which communicates with the fluid inlet. The side wall of the inner cylinder near the fluid inlet is recessed inward to form a clearance portion, which avoids the extension space of the output end in the inflow direction of the oil-gas mixture.

2. The oil-gas separator according to claim 1, characterized in that, The vertical dimension of the output end is greater than its horizontal dimension.

3. The oil-gas separator according to claim 1, characterized in that, The fluid transport pipeline includes a first pipe section and a second pipe section. One end of the first pipe section forms the output end, and the other end of the first pipe section is connected to the second pipe section. The cross-sectional area of ​​the first pipe section is larger than that of the second pipe section.

4. The oil-gas separator according to claim 3, characterized in that, The fluid transport pipeline further includes a third pipe section located between the first pipe section and the second pipe section, wherein the cross-sectional area of ​​the third pipe section is larger than that of the second pipe section, and the cross-sectional area of ​​the first pipe section is greater than or equal to that of the third pipe section.

5. The oil-gas separator according to claim 1, characterized in that, The end face of the output terminal is close to the inner periphery of the fluid inlet, and / or The inflow direction of the oil-gas mixture is parallel to the tangent direction of the cross-section of the outer cylinder.

6. The oil-gas separator according to claim 1, characterized in that, It also includes an oil separator core disposed in the second inner cavity and an exhaust pipe connected to the oil separator core.

7. The oil-gas separator according to claim 6, characterized in that, The outer cylinder has an exhaust port on its side wall. One end of the exhaust pipe is connected to the oil separator core, and the other end of the exhaust pipe is connected to the exhaust port.

8. The oil-gas separator according to claim 7, characterized in that, The exhaust pipe includes a fourth pipe section and a fifth pipe section. The fourth pipe section extends vertically near the axis of the outer cylinder. The top end of the fourth pipe section is connected to the oil separator core. The bottom end of the fourth pipe section extends to a position near the exhaust port and is connected to one end of the fifth pipe section. The fifth pipe section extends horizontally, and the other end of the fifth pipe section is connected to the exhaust port.

9. The oil-gas separator according to claim 1, characterized in that, The clearance portion includes a groove formed by the inward indentation of a portion of the inner cylinder's sidewall near the fluid inlet. The groove includes a bottom wall and a first sidewall and a second sidewall that are vertically opposite each other. The first sidewall is connected to the upper edge of the bottom wall and is inclined toward the top of the inner cylinder. The second sidewall is connected to the lower edge of the bottom wall and is inclined toward the bottom of the inner cylinder.

10. A gas compression system, characterized in that, Includes an oil-gas separator and a compressor unit as described in any one of claims 1 to 9, wherein the fluid outlet of the compressor unit is connected to the inlet of the fluid delivery pipeline of the oil-gas separator.

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