Rotor compressor with built-in centrifugal oil-gas separation device

Abstract

The utility model provides a rotor compressor with a built-in centrifugal oil-gas separation device, which comprises two cylinders, namely an upper cylinder and a lower cylinder; the middle plate is provided with a middle plate containing cavity and is arranged between the upper air cylinder and the lower air cylinder, and the middle plate containing cavity receives high-pressure gas compressed by at least one air cylinder; the oil-gas separation device is provided with an oil separation cavity which is arranged on one side of a main shaft of the compressor, an oil separation pipe extends into the oil separation cavity, and the high-pressure gas in the containing cavity of the middle plate enters the space between the oil separation pipe and the oil separation cavity to be spirally separated. Original components of an existing compressor are adopted, only the oil separation cavity is arranged inside the compressor, additional components are not needed, the problems of space occupation, complex installation and the like possibly caused by an external oil-gas separator are avoided, and the compressor is more compact in overall structure and simpler and more convenient to install.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely relates to a rotor type compressor with built-in centrifugal oil-gas separation device. BACKGROUND

[0002] Rotor type compressors are widely used in refrigeration, air conditioning and other equipment due to their compact structure, stable operation and high efficiency. The core working principle of rotor type compressors is to compress and output gas through motor rotor rotation. However, during the compression process, refrigerant and lubricating oil will mix to form an oil-gas mixture, which can cause several problems. First, during operation, the oil-gas mixture will enter the system with the refrigerant due to the mixing of lubricating oil and refrigerant, which not only affects the heat exchange effect of the refrigerant and reduces the cooling efficiency, but also can cause oil deposition in components such as pipelines and condensers, resulting in a decrease in equipment performance. Second, the oil-gas mixture also negatively affects the lubrication system inside the compressor, which can lead to poor lubrication, increased friction and wear, and reduced service life of the compressor.

[0003] Currently, some air conditioning systems use external oil-gas separators to reduce the oil output rate of the compressor and improve oil-gas separation efficiency. These external oil-gas separators separate oil and gas from the refrigerant and return them to the compressor oil pool, reducing the oil output rate. However, the existing external oil-gas separators often increase the complexity and volume of the system, requiring additional installation space and maintenance costs. Due to structural limitations, the oil-gas separation efficiency of external separators is often affected by external conditions such as refrigerant flow and working pressure, making it difficult to maintain high and stable oil-gas separation efficiency.

[0004] Therefore, how to achieve efficient and stable oil-gas separation inside the compressor without increasing additional space and complexity, and reduce the oil output rate, is a problem that needs to be solved in current technology. INVENTION CONTENTS

[0005] To solve the problems in the prior art, the purpose of the utility model is to provide a rotor type compressor with built-in centrifugal oil-gas separation device, aiming to reduce the oil output rate, improve the oil-gas separation efficiency, and further improve the performance and reliability of the compressor.

[0006] The utility model provides a rotor type compressor with built-in centrifugal oil-gas separation device, comprising:

[0007] Two cylinders, an upper cylinder and a lower cylinder;

[0008] An intermediate plate, the intermediate plate has an intermediate plate cavity and is arranged between the upper cylinder and the lower cylinder, the intermediate plate cavity receives at least one high-pressure gas compressed by the cylinder;

[0009] The oil-gas separation device has an oil separation cavity arranged on one side of the main shaft of the compressor, an oil separation pipe is arranged in the oil separation cavity, and high-pressure gas in the middle plate cavity is separated by the oil separation pipe and the oil separation cavity.

[0010] In some embodiments, the middle plate includes an upper middle plate and a lower middle plate, and the middle plate cavity is enclosed by the upper middle plate and the lower middle plate.

[0011] In some embodiments, the oil separation cavity is enclosed by the upper middle plate, the lower middle plate, the lower cylinder, and the lower cylinder cover of the compressor.

[0012] In some embodiments, the oil separation pipe is a copper pipe for discharging refrigerant, and the upper middle plate section of the oil separation cavity is provided with a stepped structure, and the oil separation pipe is fixed by interference fit with the stepped structure.

[0013] In some embodiments, the inner diameters of the upper middle plate section, the lower middle plate section, and the lower cylinder section of the oil separation cavity are the same or tapered.

[0014] In some embodiments, the lower cylinder cover section of the oil separation cavity further includes an oil discharge outlet, and the oil discharge outlet is arranged at the bottom of the lower cylinder cover section of the oil separation cavity and communicates with the oil pool of the compressor.

[0015] In some embodiments, the lower cylinder cover section of the oil separation cavity is arranged as an inverted conical body structure, the bottom surface of the inverted conical body structure is connected with the lower cylinder section of the oil separation cavity and has the same inner diameter, and the oil discharge outlet is arranged at the top of the inverted conical body structure.

[0016] In some embodiments, at least a portion of the inner wall of the oil separation cavity is a cylindrical surface.

[0017] In some embodiments, the oil separation cavity has a flow guide inlet, the flow guide inlet is tangent to the cylindrical surface of the oil separation cavity, and the oil separation cavity receives high-pressure gas from the middle plate cavity through the flow guide inlet.

[0018] In some embodiments, the inner wall of the oil separation cavity is further provided with a micro groove or a texture structure.

[0019] In summary, this invention provides a highly efficient and simple built-in oil-gas separator. It utilizes existing compressor components, only incorporating an oil separator chamber within it, eliminating the need for additional parts. This avoids the space occupation and installation complexity issues that can arise from external oil-gas separators, resulting in a more compact compressor structure and easier installation. By storing high-pressure gas in the intermediate plate cavity, the gas flow into the oil-gas separator is more uniform and stable, effectively utilizing centrifugal separation principles to improve oil-gas separation, reduce compressor oil output, and prevent the negative impact of oil-gas mixtures on the system. Since this invention only incorporates an oil separator chamber within the existing compressor assembly without adding complex components, it offers significant simplicity in manufacturing, processing, and assembly, reducing production costs and making compressor maintenance and repair more convenient. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 A cross-sectional view of a rotary compressor with a built-in centrifugal oil-gas separator according to an embodiment of this utility model;

[0022] Figure 2 This is a three-dimensional structural diagram of a rotary compressor with a built-in centrifugal oil-gas separation device according to an embodiment of the present utility model.

[0023] Figure 3 This is a schematic diagram of the upper intermediate plate structure of a rotary compressor with a built-in centrifugal oil-gas separation device according to an embodiment of the present utility model.

[0024] Figure 4 This is a schematic diagram of the lower intermediate plate structure of a rotary compressor with a built-in centrifugal oil-gas separation device according to an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the lower cylinder structure of a rotary compressor with a built-in centrifugal oil-gas separation device according to an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the lower cylinder head structure of a rotary compressor with a built-in centrifugal oil-gas separation device according to an embodiment of the present invention.

[0027] 100-oil separation cavity, 110-upper intermediate plate, 111-first flow guide inlet assembly, 112-oil separation cavity upper intermediate plate section, 120-lower intermediate plate, 121-second flow guide inlet assembly, 122-oil separation cavity lower intermediate plate section, 130-oil separation pipe, 210-upper cylinder, 220-lower cylinder, 221-oil separation cavity lower cylinder section, 310-upper cylinder head, 320-lower cylinder head, 321-oil separation cavity lower cylinder head section, 322-oil discharge outlet, 400-compressor main shaft. DETAILED DESCRIPTION

[0028] The present application is described in detail below with specific reference to particular embodiments. Those skilled in the art will readily recognize that other advantages and benefits are evident and that certain embodiments and details can be varied considerably without departing from the scope of the application. Embodiments and features disclosed in this document, including in the examples, can be combined with each other unless specifically noted otherwise.

[0029] The embodiments of the present application will be described in detail below with reference to the drawings. The present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Please refer to the drawings as needed.

[0030] In the description of the present application, the expressions "one embodiment", "some embodiments", "example", "specific example" or "some examples" are intended to indicate that the specific features, structures, materials, or characteristics combined with or described in the embodiment or example are included in at least one embodiment or example of the present application. In addition, the specific features, structures, materials, or characteristics combined with or described with any one or more embodiments or examples can be combined with one or more other embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in the present application without contradiction.

[0031] In addition, the terms "first", "second", etc. are used only to indicate the purpose and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0032] In order to clearly illustrate the present application, devices irrelevant to the description are omitted, and the same or similar constituent elements throughout the description are assigned the same reference numerals.

[0033] Throughout the specification, when it is said that an element is "connected" to another element, this includes not only the case where it is "directly connected", but also the case where it is "indirectly connected" with other elements interposed therebetween. In addition, when it is said that an element "includes" a certain constituent element, unless specifically stated to the contrary, other constituent elements are not excluded, but it means that other constituent elements can also be included.

[0034] It should be further understood that the terms "comprises" and "comprising", when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, groups, and / or portions, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, groups, and / or portions. As used herein, the terms "or" and "and / or" are to be interpreted as inclusive, i.e., as meaning either item alone, or any combination of items. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition will occur only when a combination of elements, functions, steps or operations are in some way inherently mutually exclusive.

[0035] Although not differently defined, technical and scientific terms used herein include the technical terms and scientific terms commonly used in the art to which the present application pertains. The terms defined in a general dictionary are additionally interpreted to have the same meaning as commonly understood by those skilled in the art, and the present application is not to be interpreted as having an ideal or overly formal meaning unless defined.

[0036] The utility model discloses based on centrifugal separation principle, through the centrifugal force of high pressure gas rotation separates lubricating oil and refrigerant gas in oil gas mixture. Through setting an effective oil gas separation cavity in the compressor, oil gas mixture reaches the purpose of high -efficient separation through centrifugal separation. Although the external oil separator of traditional technology can realize oil gas separation, because of the complexity of the external structure of oil separator and oil gas separation process, often be influenced by flow fluctuation, oil gas mixture viscosity change etc. Factor, lead to unstable separation effect. The utility model discloses through embedding oil gas separation device in the compressor, solved the complexity of structure, space occupation and maintenance cost problem that external oil separator can bring. And the setting of intermediate plate cavity provides a stable gas flow area, so that gas can be in relatively stable state before entering oil gas separation cavity, thereby ensuring the high efficiency of oil gas separation. The utility model discloses can realize efficient oil gas separation, and centrifugal force can effectively separate oil and gas, so that the mixture between lubricating oil and refrigerant gas is significantly reduced, reduces the oil output rate of compressor, and improves the heat exchange efficiency of refrigerant. Secondly, the utility model discloses also simplified the structure of compressor, through embedding oil gas separation device in the compressor, avoid the complexity of external separator, simplify the overall structure of compressor simultaneously, reduce the volume and component quantity. In addition, the utility model discloses also improves the performance and reliability of compressor, through effective oil gas separation, the utility model discloses reduces the influence of oil gas mixture on compressor, reduces internal oil deposition, improves the lubricating effect of compressor, prolongs the service life of equipment, and ensures the efficient operation of equipment under different working conditions.

[0037] Figure 1 It is the sectional view of the rotor type compressor of the built-in centrifugal oil gas separation device of the utility model embodiment. Figure 2 It is the three-dimensional structure schematic diagram of the rotor type compressor of the built-in centrifugal oil gas separation device of the utility model embodiment. Figure 4 It is the lower intermediate plate structure schematic diagram of the rotor type compressor of the built-in centrifugal oil gas separation device of the utility model embodiment. Figure 5 It is the lower cylinder structure schematic diagram of the rotor type compressor of the built-in centrifugal oil gas separation device of the utility model embodiment. Figure 6 It is the lower cylinder cover structure schematic diagram of the rotor type compressor of the built-in centrifugal oil gas separation device of the utility model embodiment. Figures 1 to 6As shown, the utility model embodiment provides a kind of rotor compressor of built-in centrifugal oil-gas separation device. The compressor includes two cylinders, intermediate plate cavity, oil-gas separation device and oil separation cavity 100 using centrifugal force to carry out oil-gas separation. Oil-gas separation device has oil separation cavity 100 set in one side of compressor main shaft 400, and the utility model is integrated by oil-gas separation device in the compressor, solves the problems, such as the complex design of traditional external oil separation device, large space occupation, installation and maintenance inconvenience etc. By setting intermediate plate cavity, high-pressure gas provides passage and is temporarily stored before entering oil-gas separation device, such as Figure 1 The direction indicated by the arrow is the direction of high-pressure gas flow. Stable high-pressure gas flow enters the oil-gas separation cavity. The combination of intermediate plate cavity and centrifugal force not only improves the oil-gas separation efficiency, but also reduces the oil-gas mixture inside the compressor, reduces the oil output rate, and further improves the overall performance and stability of the compressor.

[0038] In the embodiments of the utility model, take double cylinder compressor as an example, compressor contains upper cylinder cover 310, two cylinders, namely upper cylinder 210 and lower cylinder 220.Cylinder is one of the basic components of compressor, and its main function is to contain and compress the incoming gas.In the rotor compressor, the gas in the cylinder is compressed and delivered to the oil-gas separation device through the related structure.The setting and position of the upper cylinder 210 and the lower cylinder 220 provide a stable source of high-pressure gas flow for the oil-gas separation device and ensure that the high-pressure gas is in a proper state when flowing into the oil-gas separation device, which helps the subsequent oil-gas separation process.The intermediate plate cavity refers to a cavity located in the intermediate plate, which is used to receive compressed gas from the cylinder.The intermediate plate cavity can temporarily store and stabilize the gas flow before it enters the oil-gas separation device.The intermediate plate cavity provides a stable gas flow channel, avoiding the adverse effects of gas flow fluctuations or impacts on the oil-gas separation process.Through this cavity, the compressed gas can smoothly flow into the oil-gas separation device, achieving efficient oil-gas separation driven by centrifugal force.The core component of the oil-gas separation device is the oil separation cavity 100, which is designed to contain compressed gas and perform centrifugal separation.The oil separation tube 130 is inserted into the oil separation cavity 100, and the high-pressure gas in the intermediate plate cavity enters the space between the oil separation tube 130 and the oil separation cavity 100 for spiral separation.Through the structural arrangement of the oil-gas separation device, the oil separation cavity 100 can generate a spiral centrifugal force when the high-pressure gas passes through the oil-gas separation device, forcing the oil and gas to separate.The connection method of the oil separation cavity 100 and the intermediate plate cavity determines the direction of gas flow and its behavior in the oil-gas separation device, further optimizing the oil-gas separation effect.The function of the oil-gas separation device is to reduce the oil discharge rate of the compressor, thereby improving the operating efficiency of the compressor.By setting the oil-gas separation device with a spiral centrifugal force, the oil in the high-pressure gas can be separated by utilizing the spiral centrifugal force generated by high-speed rotation.After entering the oil separation cavity 100, the high-pressure gas and oil begin to separate under the action of the spiral centrifugal force, and the heavier oil is thrown to the outer wall of the oil separation cavity 100, while the lighter gas continues to flow to the central area of the oil-gas separation cavity, completing the oil-gas separation.This method can significantly improve the oil-gas separation efficiency, reduce the loss of refrigerant oil in the compressor, and reduce the failure rate of the equipment.

[0039] In some optional embodiments, the intermediate plate includes an upper intermediate plate 110 and a lower intermediate plate 120, and the intermediate plate cavity is formed by the combination of the upper intermediate plate 110 and the lower intermediate plate 120.Specifically, the upper intermediate plate 110 and the lower intermediate plate 120 are respectively provided with a structure having a planar contact, which are connected to each other by mechanical fixation or adhesive bonding. Figure 2 、 Figure 3 and Figure 4As shown, the upper intermediate plate 110 and the lower intermediate plate 120 have a hollow structure with a recess on one side, thereby defining a space region of the intermediate plate cavity between the upper intermediate plate 110 and the lower intermediate plate 120. The intermediate plate cavity can be used to accommodate fluid media, sealing elements or other functional components to meet different use requirements. For example, when the intermediate plate cavity is used for sealing, a sealing gasket or sealing filler material can be arranged inside it, and the sealing gasket is tightly fixed by the close combination of the upper intermediate plate 110 and the lower intermediate plate 120, so as to achieve reliable sealing effect. The connection mode of the upper intermediate plate 110 and the lower intermediate plate 120 can be achieved by various modes such as bolt fixing, buckle cooperation or welding. For example, in an optional embodiment, the upper intermediate plate 110 and the lower intermediate plate 120 are fixed by circumferentially distributed bolt holes and bolts, and a sealing groove and a sealing ring for enhancing the sealing performance can be arranged between the contact surfaces of the upper intermediate plate 110 and the lower intermediate plate 120; in another optional embodiment, the two are quickly assembled by a buckle structure, and the elasticity of the buckle makes the installation more convenient and can absorb the connection tolerance within a certain range. The materials of the above-mentioned upper intermediate plate 110 and lower intermediate plate 120 can be selected according to application requirements, for example, metal materials (such as aluminum alloy, stainless steel) can be used to provide good mechanical strength and corrosion resistance, and engineering plastics (such as polytetrafluoroethylene, polyether ether ketone) can be used to achieve lightweight and chemical corrosion resistance.

[0040] By adopting the embodiment of the utility model, the intermediate plate cavity formed by the combination of the upper intermediate plate 110 and the lower intermediate plate 120 has high flexibility in setting, and the size and shape of the cavity can be adjusted according to actual application. For example, it can be set to a circular, rectangular or other regular geometric shape to adapt to different fluid channel connection or functional component accommodation requirements. In addition, the split design of the upper intermediate plate 110 and the lower intermediate plate 120 facilitates processing, manufacturing and assembly, effectively improving production efficiency and assembly quality control level. By setting the intermediate plate as a split structure including the upper intermediate plate 110 and the lower intermediate plate 120, and forming the intermediate plate cavity by the combination of the two, the embodiment of the utility model not only effectively improves the modularization degree of the assembly and the convenience of processing and assembly, but also ensures the sealing performance and mechanical stability of the cavity. Especially for the application scene that needs to accommodate fluid media, the embodiment can achieve pressure resistance, corrosion resistance and reliable sealing effect by flexibly selecting materials and connection modes, thereby significantly improving the applicability and reliability of the device.

[0041] In some optional embodiments, the oil separation cavity 100 is enclosed by the upper intermediate plate 110, the lower intermediate plate 120, the lower cylinder 220, and the lower cylinder cover 320 of the compressor. Specifically, the oil separation cavity 100 is formed in dependence on the close connection between the components. The upper intermediate plate 110 and the lower intermediate plate 120 are integrated by mechanical connection (such as bolt fastening or welding), the lower intermediate plate 120 is further connected with the lower cylinder 220 by a fixing structure, the lower cylinder 220 is sealingly matched with the lower cylinder cover 320 of the compressor, and the corresponding positions of the upper intermediate plate 110, the lower intermediate plate 120, the lower cylinder 220, and the compressor are all arranged to cooperate cavities to form the closed oil separation cavity 100. The upper intermediate plate 110 and the lower intermediate plate 120 cooperate to form the upper structure of the oil separation cavity 100. The contact surface between the two can be provided with a sealing groove and a sealing ring to enhance the sealing performance. The connection mode can be bolt fastening, welding, or a buckle type structure. The upper intermediate plate 110 can be provided with a plurality of functional holes for connecting with external pipelines or channels to realize oil-gas separation or fluid transmission functions. The lower intermediate plate 120 is connected with the lower cylinder 220. In the connection area, the bolts can be uniformly distributed in the circumference for fixation, and sealing material can also be arranged between the contact surfaces to ensure the sealing of the connection. The lower intermediate plate 120 provides intermediate support for the oil separation cavity 100 and serves as the basis for installing functional components. The bottom of the lower cylinder 220 is directly connected with the lower cylinder cover 320 of the compressor. The sealing between the two can be realized by end face sealing. The lower cylinder cover 320 of the compressor not only serves as the bottom of the oil separation cavity 100, but also connects with the mechanical part of the compressor to ensure the stability of the overall structure. The materials of the upper intermediate plate 110, the lower intermediate plate 120, the lower cylinder 220, and the lower cylinder cover 320 of the compressor can be selected according to actual needs. The shape and volume of the oil separation cavity 100 can be set according to the specific application scenarios of the compressor. For example, it can be set as a cylindrical shape, an elliptical shape, or other regular shapes to adapt to different installation spaces and functional requirements.

[0042] By enclosing the oil separation cavity 100 by the upper intermediate plate 110, the lower intermediate plate 120, the lower cylinder 220, and the lower cylinder cover 320 of the compressor, the embodiment of the utility model effectively realizes the integrated design and modular manufacturing of the oil separation cavity 100. The oil-gas mixture generated during the operation of the compressor can be accommodated to realize oil-gas separation and ensure the normal operation of the lubrication system and fluid transmission of the compressor. In addition, reliable sealing structures are adopted between the components to effectively prevent oil-gas leakage and ensure the sealing performance of the system.

[0043] In some optional embodiments, the oil separation tube 130 is a copper tube used for the discharge of the refrigerant, and the oil separation tube 130 is fixed to the stepped structure of the oil separation cavity upper middle plate section 112 by interference fit. Specifically, the outer diameter of the oil separation tube 130 is slightly larger than the inner diameter of the stepped structure, and through slight elastic deformation during assembly, reliable fixation of the oil separation tube 130 is achieved, avoiding loosening or leakage. The oil separation tube 130 serves as a channel for the discharge of the refrigerant, and is made of high-quality copper material (such as red copper), which has excellent heat conduction performance, corrosion resistance, and high strength, ensuring stable flow of the refrigerant and long-term reliability. The size of the oil separation tube 130 can be set according to the refrigerant flow requirements, and the specific wall thickness can be selected according to the working pressure of the refrigerant. The upper middle plate section is processed to have a stepped structure at the refrigerant outlet area, and the inner diameter of the step is slightly smaller than the outer diameter of the oil separation tube 130, forming the basis for interference fit. The stepped structure can be a stepped hole or a tapered hole, the former is easy to process and firmly installed, and the latter can increase the sealing performance of the fit by gradually extruding during assembly. The interference fit of the oil separation tube 130 and the stepped structure is achieved by mechanical assembly process. During assembly, cold shrink assembly (such as cooling the oil separation tube 130 to low temperature and then inserting it into the stepped hole) or direct press fitting can be used. The interference fit not only ensures the stable position of the oil separation tube 130 in the oil-gas separation device, but also achieves a certain sealing effect by the tightness of the contact surface, preventing refrigerant leakage. In addition to copper, the material of the oil separation tube 130 can also be other metal or alloy materials with good corrosion resistance, such as stainless steel, aluminum alloy, etc., to meet the needs of different refrigerant media and working environments. The shape of the stepped structure can be a straight step, a tapered transition, or a multi-step, designed and optimized according to the processing technology and assembly requirements. In addition to interference fit, the oil separation tube 130 and the stepped structure can also be connected by other forms of connection, such as sealing glue bonding, flange clamping, threaded connection, etc., to further enhance the reliability of the connection.

[0044] In some optional embodiments, the inner diameters of the upper oil separation cavity intermediate plate section 112, the lower oil separation cavity intermediate plate section 122, and the lower oil separation cavity cylinder section 221 are the same or tapered. Specifically, the oil-gas separation process in the oil separation cavity 100 needs to be achieved by the flow path, flow rate variation, and gas-liquid density difference of the refrigerant and oil-gas mixture. In conventional designs, the different sections of the oil separation cavity 100 can have inconsistent inner diameters due to limitations of the processing technology or design differences, which can cause the oil droplets to fall unevenly and affect the oil separation performance. The inner diameters of the upper oil separation cavity intermediate plate section 112, the lower oil separation cavity intermediate plate section 122, and the lower oil separation cavity cylinder section 221 are kept consistent, forming a smooth inner wall flow channel in the entire oil separation cavity 100. The inner diameter sizes of the upper oil separation cavity intermediate plate section 112, the lower oil separation cavity intermediate plate section 122, and the lower oil separation cavity cylinder section 221 can be selected according to actual application requirements. The number of sections with consistent inner diameters can be adjusted according to design requirements, for example, a buffer section can be added between the upper oil separation cavity intermediate plate section 112 and the lower oil separation cavity intermediate plate section 122 to enhance the stability of the fluid. When the inner diameter of the oil separation cavity 100 is designed to be tapered, the cross-sectional area of the oil separation cavity 100 gradually decreases, which will cause the kinetic energy to gradually concentrate during gas flow, increase the gas flow velocity, and thus enhance the centrifugal force. The enhancement of the centrifugal force will further strengthen the oil-gas separation effect, which is beneficial for the oil separation to deposit on the cavity wall. In addition, the tapered design can also form a stronger oil aggregation effect at the bottom of the cavity, which is conducive to the oil separation flowing into the oil pool through the oil discharge outlet. In addition, the consistent inner diameter design is not limited to circular or conical inner diameters, but can also be applied to other cross-sectional shapes, which are determined according to the fluid dynamics requirements.

[0045] In some optional embodiments, the oil separation cavity lower cylinder head section 321 further comprises an oil discharge outlet 322, which is arranged at the bottom of the oil separation cavity lower cylinder head section 321 and communicates with the oil pool of the compressor. Specifically, since the oil discharge outlet 322 is located at the lowest point of the oil separation cavity 100, the lubricating oil can be automatically collected and discharged to the oil pool of the compressor under the action of gravity, without the need for additional oil discharge devices or power. The arrangement of the oil discharge outlet 322 helps to further optimize the liquid-gas separation path inside the oil separation cavity 100, reduces the interference of the lubricating oil remaining in the cavity on the gas flow, thereby improving the flow efficiency and separation effect of the refrigerant gas. Through the communication of the oil discharge outlet 322 with the oil pool, a closed-loop lubricating oil circulation system is formed. The embodiments of the present application can continuously provide lubricating oil for the compressor, ensuring the lubrication effect of the moving parts during the operation of the compressor. The oil discharge outlet 322 is not limited to being arranged at the center bottom of the oil separation cavity lower cylinder head section 321, and can be adjusted to be close to the edge or multiple oil discharge outlets 322 can be arranged to adapt to different oil requirements. The shape of the oil discharge outlet 322 can be circular, oval or other shapes suitable for fluid flow, and its diameter can be adjusted according to the oil flow requirements of the system. The material of the oil discharge outlet 322 can be corrosion-resistant metal (such as stainless steel, copper) or high-strength plastic to meet the corrosion resistance and durability requirements of different working environments.

[0046] In some optional embodiments, the oil separation cavity lower cylinder head section 321 is arranged as an inverted cone structure, the bottom surface of the inverted cone structure is connected with the oil separation cavity lower cylinder section 221 and has the same inner diameter, and the oil discharge outlet 322 is arranged at the top of the inverted cone structure. The embodiment of the utility model further optimizes the discharge path of the lubricating oil and the fluid dynamics inside the cavity during the oil-gas separation process through the geometric characteristics of the inverted cone structure. The inverted cone refers to a geometric structure with a wide bottom and a gradually narrowing top forming a cone top. The main function of this structure is to use the flow guiding effect of the conical inner wall to collect the separated lubricating oil at the cone top position, thereby achieving the effect of concentrated oil discharge. The bottom surface of the inverted cone structure has the same inner diameter as the inner diameter of the oil separation cavity lower cylinder section 221, which ensures the continuity of the flow path of the lubricating oil and the refrigerant gas, and avoids fluid disturbance or pressure loss caused by cross-section changes. The oil discharge outlet 322 is located at the highest point (i.e. the cone top) of the inverted cone structure, which serves as the final collection point of the lubricating oil, and directly discharges the oil into the compressor oil pool through gravity. This arrangement can minimize the residual lubricating oil and improve the completeness of oil-gas separation. The geometric properties of the inverted cone can ensure that the oil is quickly and effectively concentrated, thereby avoiding the dispersion and retention of lubricating oil in the cavity. The inverted cone structure is arranged to reduce the area of the cone top and accurately position the lubricating oil collection point at the oil discharge outlet 322, thereby reducing the complexity of the oil discharge path and the possibility of blockage. The smooth transition of the inverted cone structure has the same inner diameter as the lower cylinder section, which can avoid vortex or uneven flow velocity of the refrigerant gas during flow due to cross-section changes, and ensure the stability of the refrigerant gas flow. At the same time, this continuous structure further avoids the problem of oil-gas re-mixing inside the cavity. The oil discharge outlet 322 at the cone top is the only lubricating oil outlet, and the oil discharge path is short and direct. Combined with the oil guiding effect of the inverted cone, the oil discharge process can be efficiently completed without additional power devices, reducing energy consumption and cost. The cone angle of the inverted cone can be adjusted according to actual needs. To adapt to the viscosity characteristics and separation efficiency of different fluids. Although the inner diameter of the bottom surface of the inverted cone is consistent with the lower cylinder section, in specific requirements, the inner diameter difference can be adjusted to optimize the flow velocity distribution or pressure characteristics of the refrigerant gas. The oil discharge outlet 322 can be arranged as a cone top outlet, or one or more oil discharge outlets 322 can be additionally arranged around the cone top according to the oil quantity requirement, but the total flow area of the oil discharge outlets 322 should be less than the flow area of the oil separation pipe 130 to further improve the discharge efficiency of the lubricating oil. In addition to the inverted cone, arc-shaped or other tapered structures with similar flow guiding effects can also be used, which can be replaced according to the fluid characteristics and manufacturing process requirements.

[0047] In some alternative embodiments, at least a portion of the inner wall of the oil separation cavity 100 is a cylindrical surface. By providing a cylindrical surface structure on the inner wall of the oil separation cavity 100, the fluid flow characteristics inside the cavity are optimized, and the efficiency and stability of the oil-gas separation process are improved. The cylindrical surface refers to a portion of the inner wall with a constant diameter, which geometrically represents a symmetrical cylindrical inner wall region. By setting at least a portion of the inner wall of the oil separation cavity 100 as a cylindrical surface, a uniform cavity shape is provided, which helps to regulate the flow of fluid within the cavity. The cylindrical surface can extend throughout the oil separation cavity 100, or only form a cylindrical surface in a specific section (such as the upper intermediate plate section 112 or the lower cylinder section) to achieve control and optimization of specific fluid dynamics. The cylindrical surface provides a regular and symmetrical inner wall surface, which ensures that the refrigerant gas avoids vortex and disturbance caused by complex inner wall geometry during flow, and ensures stable flow of the gas within the oil separation cavity 100. The stability of this flow helps to efficiently separate the oil and gas during the separation process. The cylindrical surface provides a smooth inner wall surface for the lubricating oil, avoiding the hindering effect of rough or irregular inner walls on the oil flow, allowing the oil to collect more quickly at the bottom of the cavity, and further improving the oil discharge efficiency. The cylindrical surface inner wall reduces the fluid flow velocity gradient inside the cavity, effectively avoiding the mixing phenomenon caused by velocity changes during the oil-gas separation process, thereby ensuring the stability of the separation effect. The cylindrical surface structure is easier to process than other complex geometric shapes, and the smooth cylindrical inner wall is easy to clean and maintain, improving the service life of the oil separation cavity 100. Although the cylindrical surface is the preferred design, the inner wall shape can also be a conical surface, an arc surface, or other gradually changing curved surface to meet different fluid dynamics requirements under specific needs. The cylindrical surface can cover all or part of the oil separation cavity 100. For example, the cylindrical surface can be provided only in the lower cylinder section to optimize the oil discharge path, or in the upper intermediate plate section 112 to optimize the separation path of the refrigerant gas.

[0048] In some alternative embodiments, the oil separation cavity 100 has a flow guide inlet that is tangent to the cylindrical surface of the oil separation cavity 100, and the oil separation cavity 100 receives high-pressure gas from the intermediate plate cavity through the flow guide inlet. Specifically, the flow guide inlet is formed by the first flow guide inlet component 111 provided on the upper intermediate plate 110 and the second flow guide inlet component 121 provided on the lower intermediate plate 120 in a matched manner. In the present application, the flow guide inlet serves as one of the structural features of the oil separation cavity 100, and plays a role in guiding the gas. The flow guide inlet is tangent to the cylindrical surface of the oil separation cavity 100, ensuring that the high-pressure gas can flow into the oil separation cavity 100 at an appropriate angle, providing initial power for the centrifugal force of oil-gas separation, and helping to maintain smooth flow of the gas stream, reducing unnecessary interference of the gas stream in the cavity,

[0049] In some alternative embodiments, the inner wall of the oil separation cavity 100 is also provided with micro-grooves or textured structures to increase the contact area of the high-pressure gas with the inner wall of the oil separation cavity 100, thereby improving the oil-gas separation efficiency. In this embodiment, the inner wall of the oil separation cavity 100 is provided with micro-grooves or textured structures to increase the contact area of the high-pressure gas with the inner wall of the oil separation cavity 100. Generally, a thin film is formed between the inner wall of the cavity and the gas flow when the high-pressure gas flows, and the separation efficiency of the gas and the oil is closely related to the contact area and distribution of the gas with the inner wall. By providing micro-grooves or textures on the inner wall, the contact area can be effectively increased, thereby promoting the contact of the oil in the gas with the inner wall and improving the oil-gas separation efficiency. In this embodiment, the micro-grooves or textured structures on the inner wall of the oil separation cavity 100 increase the contact area of the gas with the inner wall of the cavity, thereby enhancing the interaction of the gas with the inner wall when passing through the oil separation cavity 100. The embodiments of the present application help to increase the contact time of the gas and the oil, so that the oil is more easily attached to the inner wall and separated from the gas by the action of centrifugal force. In addition to using micro-grooves or textured structures, other structures or surface treatment techniques can also be used on the inner wall to increase the contact area. For example, special coatings can be considered on the inner wall, or other methods can be used to increase the surface roughness, thereby improving the oil-gas separation efficiency. These alternative solutions can achieve the same technical effect without changing the core technical idea of the present application.

[0050] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as falling within the protection scope of the present application.

Claims

1. A rotor type compressor incorporating a centrifugal oil and gas separation device, characterized by, The utility model relates to a compressor, comprising: two cylinders, an upper cylinder and a lower cylinder; a middle plate having a middle plate cavity between the upper cylinder and the lower cylinder, the middle plate cavity receiving at least one cylinder compressed high-pressure gas; an oil-gas separation device having an oil separation cavity on one side of the compressor main shaft, an oil separation tube extending into the oil separation cavity, and the high-pressure gas in the middle plate cavity being spirally separated between the oil separation tube and the oil separation cavity.

2. The rotor compressor with a built-in centrifugal oil and gas separation device according to claim 1, characterized in that The middle plate comprises an upper middle plate and a lower middle plate, and the middle plate cavity is enclosed by the upper middle plate and the lower middle plate.

3. The rotor compressor with a built-in centrifugal oil and gas separation device according to claim 2, characterized in that The oil separation cavity is enclosed by the upper middle plate, the lower middle plate, the lower cylinder, and the lower cylinder cover of the compressor.

4. The rotor-compressor of the built-in centrifugal oil and gas separation device according to claim 3, characterized in that The oil separation tube is a copper tube for refrigerant discharge, and the upper middle plate section of the oil separation cavity is provided with a stepped structure, and the oil separation tube is fixed by interference fit with the stepped structure.

5. The rotor compressor with a built-in centrifugal oil and gas separation device according to claim 3, characterized in that The inner diameters of the upper middle plate section, the lower middle plate section, and the lower cylinder section of the oil separation cavity are the same or tapered.

6. The rotor-compressor of the built-in centrifugal oil and gas separation device according to claim 5, characterized in that The lower cylinder cover section of the oil separation cavity further comprises an oil discharge outlet, and the oil discharge outlet is arranged at the bottom of the lower cylinder cover section of the oil separation cavity and communicates with the oil pool of the compressor.

7. The rotor-compressor of the built-in centrifugal oil and gas separation device according to claim 6, characterized in that The lower cylinder cover section of the oil separation cavity is provided as an inverted conical body structure, the bottom surface of the inverted conical body structure is connected with the lower cylinder section of the oil separation cavity and has the same inner diameter, and the oil discharge outlet is arranged at the top of the inverted conical body structure.

8. The rotor-compressor of the built-in centrifugal oil and gas separation device according to claim 1, characterized in that, At least a part of the inner wall of the oil separation cavity is a cylindrical surface.

9. The rotor-compressor of the built-in centrifugal oil and gas separation device according to claim 8, characterized in that The oil separation cavity has a flow guide inlet tangent to the cylindrical surface of the oil separation cavity, and the oil separation cavity receives high-pressure gas from the middle plate cavity through the flow guide inlet.

10. The rotor-compressor of a built-in centrifugal oil and gas separation device according to any one of claims 1-9, characterized in that, The inner wall of the oil separation cavity is further provided with a micro groove or texture structure.

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