Fluid medium circulation system, compressor and fluid machine

Abstract

The utility model relates to a fluid medium circulation system, a compressor and a fluid machine. The fluid medium circulating system comprises a first pipeline, a coaxial pump and a second pipeline. The coaxial pump is installed on the rotating shaft to be driven, the first pipeline is connected to an input port of the coaxial pump so as to receive and transmit the fluid medium leaked from the sealing structure, and the second pipeline is connected to an output port of the coaxial pump so as to circulate the leaked fluid medium back into the fluid storage part. Thus, according to the fluid medium circulation system, the compressor and the fluid machine, fluid medium leakage and / or pollution can be prevented, and the running cost loss of a customer is reduced by recycling the fluid medium.

Description

Technical Field

[0001] The present disclosure relates to the field of fluid machinery, and more particularly to a fluid medium circulation system, a compressor, and a fluid machinery. Background Art

[0002] As is known, a mechanical seal is a device that is perpendicular to the end face of a rotating shaft and maintains contact and relative sliding to prevent fluid leakage under the action of fluid pressure and the elastic force or other forces of an elastic compensation mechanism and with the cooperation of auxiliary seals. Such mechanical seals are widely used in the field of fluid machinery. Specifically, fluid machinery may include a compressor. The fluid medium used for the compressor may be, for example, lubricating oil. Since there is a certain pressure difference between the inside of the compressor and the external environment, even if the mechanical seal is used, there will still be a certain leakage of the fluid medium in the compressor. For mechanical seals with different shaft diameters, the national standard has certain requirements for the leakage rate. For example, when the shaft diameter of the mechanical seal is 65mm, the leakage rate of the mechanical seal must be less than or equal to 3ml / h. As the machine continues to operate for a long time, leakage of the fluid medium will cause insufficient fluid medium in the compressor. At the same time, the leakage of the fluid medium directly discharged into the environment will also cause certain pollution to the environment.

[0003] Therefore, technical improvements are needed to solve at least one of the problems of fluid medium leakage and contamination. Utility Model Content

[0004] The present disclosure aims to provide a fluid medium circulation system to solve the above technical problems. Moreover, the fluid medium circulation system is not limited to being used in compressors, but can be applied to any machine with a rotating shaft to recycle leaked fluid medium.

[0005] In one aspect, the present disclosure provides a fluid medium circulation system. The fluid medium circulation system includes a first pipeline, a coaxial pump, and a second pipeline. The coaxial pump is mounted on a rotating shaft and driven. The first pipeline is connected to the inlet of the coaxial pump to receive and transfer fluid medium leaking from a sealing structure. The second pipeline is connected to the outlet of the coaxial pump to circulate the leaked fluid medium back into a fluid reservoir.

[0006] Thus, the fluid medium circulation system disclosed herein can recycle leaked fluid medium by providing a first pipeline, a coaxial pump, and a second pipeline. This prevents the leaked fluid medium from being directly discharged into the environment and causing pollution. Furthermore, by recycling the leaked oil, the customer's operating costs are reduced. Furthermore, the coaxial pump is directly mounted on the rotating shaft, eliminating the need for an additional pump driver.

[0007] In one or more embodiments, the sealing structure includes a mechanical sealing structure installed on the rotating shaft coaxially with the coaxial pump.

[0008] In this way, the mechanical seal structure provides a good sealing effect for the rotating shaft.

[0009] In one or more embodiments, the mechanical seal structure has a mechanical seal cover plate, and the first pipeline is connected to a drain port provided at a lower portion of the mechanical seal cover plate.

[0010] In this way, the drain port facilitates the smooth and timely discharge of the leaked fluid medium.

[0011] In one or more embodiments, the fluid medium circulation system further includes a leakage-proof structure disposed in the mechanical sealing cover plate.

[0012] In this way, the provision of the leakage-proof structure prevents the leaked fluid medium from further leaking from the distal end of the mechanical seal cover plate.

[0013] In one or more embodiments, the anti-leakage structure includes a reservoir and / or a sealing component to prevent the leaked fluid medium from further leaking from the distal end of the mechanical seal cover plate.

[0014] In this way, providing the storage tank and / or the sealing component can further prevent the leaked lubricating oil from leaking from the distal end of the mechanical seal cover plate, which can further reduce or eliminate the leakage rate of the mechanical seal structure.

[0015] In one or more embodiments, the reservoir is at least partially located below the rotating shaft and is configured to block access to the distal end of the mechanical seal cover plate and to collect and store fluid media leaked from the mechanical seal structure.

[0016] In this way, the provision of the reservoir can further prevent the fluid medium from leaking from the distal end of the mechanical seal cover plate.

[0017] In one or more embodiments, the drain port is disposed at the bottom of the storage tank.

[0018] In this way, the drain port provided in this manner ensures that the fluid medium leaking from the mechanical seal structure can be discharged from the storage tank in a timely manner via the drain port.

[0019] In one or more embodiments, the sealing component is disposed adjacent to the reservoir and within a distal end of the mechanical seal cover plate around the rotation axis.

[0020] In this way, provision of the sealing component can further prevent the fluid medium from leaking from the distal end of the mechanical seal cover plate into the environment.

[0021] In one or more embodiments, the storage volume of the reservoir is between 36 ml and 72 ml.

[0022] In this way, even if leakage occurs when the screw compressor is not running, the storage volume can ensure that the fluid medium stored in the storage tank will not overflow from the distal end of the mechanical seal cover plate.

[0023] In one or more embodiments, the storage tank has a configuration with a circular, rectangular, semicircular or polygonal cross section.

[0024] Thus, the storage tank having such a structure can be easily processed.

[0025] In one or more embodiments, a reservoir having a semicircular configuration is disposed around the rotation axis and on the underside of the rotation axis.

[0026] In this way, the storage tank constructed in this way can also reduce the processing cost of the mechanical seal cover plate and ensure the strength of the mechanical seal cover plate.

[0027] In one or more embodiments, the coaxial pump includes an internal gear fixed to the rotating shaft to rotate synchronously with the rotating shaft.

[0028] This way, the rotating shaft drives the coaxial pump synchronously, eliminating the need for an additional pump driver. The rotation of the internal gear is used to pump out the leaked fluid medium.

[0029] In one or more embodiments, the coaxial pump includes a pump housing fixed to a casing of a machine, the internal gear is accommodated in the pump housing, and the inlet and the outlet are provided on the pump housing.

[0030] In this way, the coaxial pump thus constructed provides a pumping action so as to circulate the fluid medium leaking from the mechanical seal structure back into the oil reservoir.

[0031] In one or more embodiments, the mechanical seal structure further includes a mechanical seal static ring, a mechanical seal dynamic ring, a static ring auxiliary seal, a dynamic ring auxiliary seal and an elastic force compensation mechanism to collaboratively provide a sealing effect.

[0032] In this way, the mechanical seal structure constructed in this way can provide a good sealing effect for the rotating shaft to prevent leakage of the fluid medium.

[0033] In another aspect, the present disclosure provides a compressor including the fluid medium circulation system according to the present disclosure.

[0034] In this way, the compressor according to the present disclosure can prevent leakage and / or contamination of the fluid medium by using the fluid medium circulation system according to the present disclosure, and reduce the operating cost loss of the customer by recycling the fluid medium.

[0035] In one or more embodiments, the compressor includes a compressor body, a rotating shaft, and a casing. The rotating shaft extends from the compressor body and is at least partially enclosed within the casing. A mechanical seal structure is disposed around the rotating shaft at the compressor suction end, between the rotating shaft and the casing. The fluid medium circulation system is configured to circulate fluid medium leaking from the mechanical seal structure.

[0036] In this way, the mechanical seal structure provides a good sealing effect for the rotating shaft of the compressor, and the fluid medium circulation system further recycles the fluid medium leaked from the mechanical seal structure to prevent environmental pollution and reduce operating cost losses.

[0037] In one or more embodiments, the compressor further includes a heat exchanger arranged adjacent to the compressor body and a main oil supply line for supplying high-temperature refrigeration oil. The second line of the fluid medium circulation system transports the low-temperature fluid medium leaked from the mechanical seal structure. The main oil supply line and the second line extend through the heat exchanger before being connected to the compressor body to enable heat exchange between the high-temperature refrigeration oil and the low-temperature fluid medium.

[0038] In this way, the leaked low-temperature fluid is reused in the heat exchanger to exchange heat with the main oil in the main oil supply line, thereby lowering the main oil temperature. This solves the compressor oil cooling problem to a certain extent. The cooled main oil enters the compressor and lubricates and cools the bearings, screw shaft, and other components, fully maximizing the oil cooling effect.

[0039] In one or more embodiments, the flow storage portion is a closed tooth slot of a screw rotor of a compressor, and the second pipeline is connected to a tooth slot inlet leading to the closed tooth slot of the screw rotor.

[0040] In this way, the leaked fluid medium can be circulated back to the closed tooth grooves of the screw rotor in the compressor body for recycling.

[0041] In yet another aspect, the present disclosure provides a fluid machine including the compressor according to the present disclosure.

[0042] In this way, the fluid machinery according to the present disclosure can prevent leakage and / or contamination of the fluid medium by utilizing the fluid medium circulation system according to the present disclosure, and reduce the operating cost loss of the customer by recycling the fluid medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The present disclosure will be more readily understood by the following detailed description in conjunction with the accompanying drawings, in which like reference numerals represent like elements. The drawings are illustrative and non-limiting. Elements in the drawings are not necessarily shown to scale; for example, elements may be enlarged for illustrative purposes or reduced in scale to keep the drawings clear and easy to understand.

[0044] In the attached figure:

[0045] Figure 1 A cross-sectional view of a compressor using a mechanical seal structure in the prior art is schematically shown.

[0046] Figure 2 A cross-sectional view of a compressor provided with a fluid medium circulation system according to the present disclosure is schematically shown.

[0047] Figure 3 Schematically shows Figure 2 An enlarged view of the fluid medium circulation system is shown.

[0048] Description of reference numerals:

[0049] Screw compressor 1; rotor shaft 2; drain port 3; casing 4; coaxial pump 5; compressor body 6; heat exchanger 7; main oil supply pipeline 8; mechanical seal structure 10; mechanical seal static ring 12; mechanical seal dynamic ring 14; static ring auxiliary seal 16; dynamic ring auxiliary seal 17; elastic compensation mechanism 18; mechanical seal cover plate 19; storage tank 31; sealing component 32; first pipeline 33; second pipeline 34; pump casing 51; internal gear 52; input port 53; output port 54; tooth groove inlet 62; main oil supply port 64. DETAILED DESCRIPTION

[0050] The present disclosure will be described below with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below. The embodiments described below are intended to make the disclosure of the present disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should be understood that the same reference numerals represent the same elements throughout the drawings.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art within the scope of the present disclosure. For the sake of brevity and / or clarity, well-known functions or structures may not be described in detail. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure.

[0052] The term "comprise" and its derivatives in the description and claims of the present disclosure are intended to be open terms that specify the presence of stated features, elements, components, groups, integers and / or steps, but do not preclude the presence of other unstated features, elements, components, groups, integers and / or steps. This concept also applies to words with similar meanings, such as the terms "have", "include" and their derivatives.

[0053] The terms “part,” “element,” “member” and the like can have the dual meaning of a single part or a plurality of parts.

[0054] In the description of the embodiments of the present disclosure, the terms "first," "second," etc., are used solely to distinguish between different objects and should not be understood to indicate or imply relative importance, or to implicitly specify the quantity, specific order, or primary-secondary relationship of the technical features indicated. Furthermore, the term "first component" itself does not necessarily imply the existence of a "second component," and the term "second component" itself does not necessarily imply the existence of a "first component."

[0055] In the description of the embodiments of the present disclosure, “a plurality of” means more than two, unless explicitly defined otherwise.

[0056] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0057] In the description of the embodiments of the present disclosure, the term "and / or" is merely a description of an association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0058] In the description of the embodiments of the present disclosure, the terms "distal", "proximal", "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be configured and operated in a specific direction. Therefore, they should not be understood as limiting the embodiments of the present disclosure.

[0059] In the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present disclosure based on specific circumstances.

[0060] The machine described herein can be any equipment having a rotating shaft and a shaft sealing structure. The fluid machinery described herein can include a compressor, particularly a screw compressor. More specifically, the screw compressor can be an open screw compressor. Below, lubricating oil is used as an example of a fluid medium used in a compressor.

[0061] In this article, the orientation of the rotor shaft of a screw compressor is used as an example to define "proximal side" and "distal side". Specifically, one side of the rotating shaft located in the compressor body is called "proximal side", and the other side is called "distal side".

[0062] With the continuous updating of screw compressor technology, it has been widely used in the fields of air conditioning, refrigeration, freezing and chemical industry. A shaft sealing structure can be set inside the casing of the screw compressor and at the end of the rotor shaft to prevent the high-pressure refrigerant in the compressor from leaking to the outside. The shaft sealing structure alone cannot achieve the sealing function and needs to be used in conjunction with lubricating oil, so oil is supplied to the shaft sealing structure for lubrication. Existing compressors are provided with a shaft seal lubrication structure on the rotor shaft of the compressor. In order to prevent the lubricating oil from losing too quickly, a lip seal (for example, an oil retaining ring) that can retain lubricating oil is also provided on the shaft seal lubrication structure, and the lip seal is installed on the housing near the shaft seal structure. Due to the pressure difference in the compressor, the lubricating oil will leak from the shaft seal structure and the lip seal, resulting in the problem of no lubrication of the compressor rotating shaft after long-term operation or long-term shutdown. In any case, the problem of lubricating oil leakage still exists, and a more effective sealing structure needs to be provided.

[0063] The prior art has disclosed a shaft seal oil supply structure for a screw compressor that is effective during long-term shutdown, and is particularly applicable to open-type compressors that have long-term (more than half a year) shutdown conditions. The screw compressor includes a casing, a rotor shaft installed inside the casing, and a main oil supply pipeline provided on the casing. A shaft seal lubrication structure is provided at the end of the rotor shaft, and the shaft seal lubrication structure has an oil outlet for the lubricating oil circuit. The oil outlet is arranged toward the low-pressure area inside the casing, and the oil outlet end of the lubricating oil circuit is connected to the oil outlet. The shaft seal oil supply structure is configured such that: the oil storage area is located above the shaft seal lubrication structure and lubricating medium is always stored in the oil storage area. The main oil supply pipeline, the oil storage area, the connecting oil circuit, the lubricating oil circuit, and the oil outlet are connected in series. When the screw compressor needs to be restarted after being shut down, the solenoid valve is opened to allow the lubricating medium stored in the oil storage area to flow from the oil storage area to the lubricating oil circuit via the connecting oil circuit. However, the shaft seal oil supply structure has an internal circulation flow path, which not only makes the internal structure complex, but also requires an oil storage area that always stores lubricating medium above the shaft seal lubrication structure, thus making the structure extremely complex.

[0064] Figure 1A schematic cross-sectional view of a compressor using a mechanical seal structure in the prior art is shown. This mechanical seal structure 10 provides more effective sealing compared to previous seal structures. As is known, the operating principle of mechanical seal structure 10 is to rely on the elastic force provided by an elastic element to overcome the friction between the auxiliary seal ring of the compensating dynamic ring and the rotating shaft, allowing the compensating ring to fit tightly against the end face of the non-compensating ring, generating an initial closing force on the sealing end face. When the machine is filled with pressure medium and begins operation, the sealing end face generates a closing force, thereby achieving a reasonable specific pressure on the sealing end face, thereby achieving a fluid seal.

[0065] The applicant makes full use of the structure and principle of the known mechanical seal structure (reference Figure 1 ) has made technical improvements to the seal of the screw compressor. Figure 1 As shown, the compressor may be a screw compressor 1. As an example of a rotating shaft of a machine, a rotor shaft 2 of the screw compressor 1 is rotatably mounted within a casing 4 (e.g., a pressure casing) of the compressor. A mechanical seal structure 10 may be disposed around the rotor shaft 2 and between the rotor shaft 2 and the casing 4 to prevent lubricating oil leakage.

[0066] exist Figure 1 In the example shown, the mechanical seal structure 10 may mainly include components such as a mechanical seal static ring 12 , a mechanical seal dynamic ring 14 , a static ring auxiliary seal 16 , a dynamic ring auxiliary seal 17 , an elastic force compensation mechanism 18 and a mechanical seal cover plate 19 .

[0067] The first end of the mechanical seal dynamic ring 14 is configured to abut the mechanical seal static ring 12, while the second end of the mechanical seal dynamic ring 14, opposite the first end, is abutted by a spring compensation mechanism 18. The mechanical seal static ring 12 and the mechanical seal dynamic ring 14 maintain a tight fit to form a sealing end face, thereby preventing fluid leakage. The mechanical seal static ring 12 and the mechanical seal dynamic ring 14 must have excellent wear resistance. The mechanical seal dynamic ring 14 can move axially to automatically compensate for seal end face wear, ensuring a good fit with the mechanical seal static ring 12 to prevent lubricant leakage. The mechanical seal static ring 12 can have a certain degree of floatability to act as a buffer.

[0068] The auxiliary stationary ring seal 16 is disposed between the mechanical seal stationary ring 12 and the mechanical seal cover plate 19. Specifically, the auxiliary stationary ring seal 16 is disposed around the rotor shaft 2 in close proximity to the distal end surface of the mechanical seal stationary ring 12 and the proximal end surface of the mechanical seal cover plate 19. This ensures a tight seal between the mechanical seal stationary ring 12 and the mechanical seal cover plate 19, thereby preventing lubricating oil from leaking through the mechanical seal cover plate 19.

[0069] The auxiliary dynamic ring seal 17 is disposed around the rotor shaft 2 at the second end of the mechanical seal dynamic ring 14 and is disposed within the inner surface of the mechanical seal dynamic ring 14. The auxiliary dynamic ring seal 17 is intended to ensure sealing between the mechanical seal dynamic ring 14 and the rotor shaft 2.

[0070] The static ring auxiliary seal 16 and the dynamic ring auxiliary seal 17 can be O-rings, V-rings, wedge rings and other special-shaped sealing rings, which mainly play the role of sealing the mechanical seal static ring 12 and the mechanical seal dynamic ring 14, and also have floating and buffering effects. Figure 1 In the example shown, the stationary ring auxiliary seal 16 and the dynamic ring auxiliary seal 17 are O-rings.

[0071] One end of the elastic compensating mechanism 18 abuts the housing 4, while the other end abuts the second end of the mechanical seal's dynamic ring 14. This mechanism primarily provides compensation, preload, and cushioning, while also generating a reasonable spring pressure on the seal end face. The elastic compensating mechanism 18 maintains its elasticity to overcome friction between the dynamic ring's auxiliary seal and the transmission components, enabling compensation. The elastic compensating mechanism 18 can be a spring, a corrugated plate, a serpentine sleeve, or other materials. Figure 1 In the illustrated example, the elastic force compensation mechanism 18 is a dynamic ring preload spring. A transmission member (not shown) is used to transmit the torque of the rotor shaft 2 to the mechanical seal dynamic ring 14. The transmission member may include a transmission pin, a transmission ring, a transmission seat, a transmission sleeve, a transmission key, a transmission lug, or a toothed connector.

[0072] exist Figure 1 In the example shown, Figure 1 The left side of the figure shows the suction side of the screw compressor and the right side shows the atmosphere. Figure 1 The mechanical seal structure 10 shown can provide a good seal for the screw compressor to prevent lubricating oil leakage. However, due to the pressure difference between the suction side and the ambient environment, a small amount of lubricating oil inside the screw compressor may still leak through the mechanical seal structure 10 and be discharged directly into the environment through the drain port 3.

[0073] As previously mentioned, since the mechanical seal structure 10 has a certain leakage rate and the leaked lubricating oil is directly discharged into the environment, as the screw compressor continues to operate for a long time, the leakage will cause a shortage of lubricating oil in the compressor and cause certain environmental pollution. In other words, since the lubricating oil leaking from the mechanical seal structure 10 is directly discharged into the environment, the problem of lubricating oil leakage and pollution still exists.

[0074] Based on the state of the prior art, the following will use a screw compressor as an example to illustrate how the fluid medium circulation system according to the present disclosure prevents leakage and / or contamination of the fluid medium (taking lubricating oil as an example), and reduces the customer's operating cost losses by recycling the leaked oil.

[0075] The general inventive concept of the present disclosure is to utilize a fluid medium circulation system comprising a first pipeline, a coaxial pump, and a second pipeline to circulate fluid medium leaking from the shaft seal structure back into the fluid reservoir of a machine, while maintaining the sealing performance of existing shaft seal structures. Specifically, the fluid medium circulation system according to the present disclosure may include a first pipeline, a coaxial pump, and a second pipeline. The coaxial pump is mounted on the rotating shaft of the machine for driving. The first pipeline and the second pipeline can be connected to the inlet and outlet of the coaxial pump, respectively, to circulate fluid medium leaking from the machine's shaft seal structure back into the fluid reservoir of the machine. In this way, the fluid medium circulation system according to the present disclosure avoids direct discharge of leaked fluid medium into the environment, which could cause pollution, and also reduces operating costs by recycling leaked oil. Furthermore, the coaxial pump is directly mounted on the rotating shaft and driven by the rotating shaft, eliminating the need for an additional pump driver. The machine can be any specific rotating shaft machine; this article uses a screw compressor as an example. The shaft seal structure can be any sealing structure, such as the aforementioned mechanical seal structure, a common labyrinth seal, or other sealing elements. This article uses the aforementioned mechanical seal structure as an example to further improve upon it.

[0076] To this end, based on the mature mechanical seal structure of the existing screw compressor, the fluid medium circulation system according to the present disclosure adds a storage tank and a sealing component to prevent the leaked lubricating oil from leaking further from the distal end of the mechanical seal cover plate. This can reduce or eliminate the leakage rate of the mechanical seal structure. A coaxial pump and a first pipeline and a second pipeline connected to the input and output ends of the coaxial pump are added to the rotor shaft of the screw compressor, and the low-temperature lubricating oil leaked into the storage tank is drained into the flow storage part of the compressor body (such as the closed tooth groove of the screw rotor) for recycling. In this way, the operating cost loss is reduced by recycling the leaked oil. At the same time, before entering the flow storage part of the compressor body, the recovered leaked low-temperature lubricating oil and the main supply oil are used for heat exchange in a heat exchanger to reduce the temperature of the main supply oil. Therefore, the secondary utilization of the leaked low-temperature fluid medium can effectively solve the oil cooling problem of the compressor.

[0077] Figure 2 A cross-sectional view of a compressor provided with a fluid medium circulation system according to the present disclosure is schematically shown. Figure 3 Schematically shows Figure 2 The enlarged view of the fluid medium circulation system is shown to more clearly show the components of the fluid medium circulation system. Among them, the reference numeral 5 overall identifies the coaxial pump and the reference numeral 10 overall identifies the mechanical seal structure.

[0078] exist Figure 2In the illustrated example, the compressor may be a screw compressor 1. More specifically, the compressor may be an open screw compressor. The screw compressor 1 may include a compressor body 6, a rotor shaft 2, and a casing 4. The rotor shaft 2 extends from the compressor body 6 and is at least partially enclosed within the casing 4. The rotor shaft 2 is rotatably mounted within the casing 4. A mechanical seal structure 10 may be disposed around the rotor shaft 2 at the compressor suction end, between the rotor shaft 2 and the casing 4, to prevent leakage of the fluid medium.

[0079] and Figure 1 The structure and function of the mechanical seal structure 10 shown are the same as those of the Figure 2 The mechanical seal structure 10 shown may also primarily include a mechanical seal stationary ring 12, a mechanical seal dynamic ring 14, a stationary ring auxiliary seal 16, a dynamic ring auxiliary seal 17, a spring force compensation mechanism 18, and a mechanical seal cover plate 19, to collaboratively provide a good sealing effect. For the sake of brevity, each component may be represented by the same reference numerals, and their structures and functions will not be described in detail.

[0080] In such Figure 1 In the compressor shown, even though a mechanical seal structure 10 with a strong sealing effect is adopted, leakage and contamination problems still exist to a certain extent.

[0081] To resolve fluid media leakage and / or contamination issues, refer to Figure 2 and Figure 3 According to the present disclosure, the fluid medium circulation system may include at least a first pipeline 33, a coaxial pump 5, and a second pipeline 34. The coaxial pump 5 is mounted on the rotor shaft 2 (i.e., a specific example of a rotating shaft) of the screw compressor 1, thereby eliminating the need for an additional pump driver. Specifically, the coaxial pump 5 and the mechanical seal structure 10 are coaxially mounted on the rotor shaft 2 of the screw compressor 1. The mechanical seal structure 10 includes a mechanical seal cover plate 19. The drain port 3 may be provided at the lower portion of the mechanical seal cover plate 19 to facilitate smoother and more timely discharge of leaked fluid medium (e.g., lubricating oil).

[0082] refer to Figure 2 and Figure 3 , the first pipeline 33 is connected between the discharge port 3 of the mechanical seal structure 10 and the input port 53 of the coaxial pump 5. The second pipeline 34 is connected between the output port 54 of the coaxial pump 5 and the compressor body 6 to circulate the fluid medium leaking from the mechanical seal structure 10 back to the flow storage portion of the compressor body 6. Specifically, the flow storage portion of the screw compressor 1 can be a closed tooth groove (not shown) of the screw rotor of the screw compressor 1, and the tooth groove inlet 62 (shown schematically) is connected to the closed tooth groove of the screw rotor. The second pipeline 34 is connected between the output port 54 of the coaxial pump 5 and the tooth groove inlet 62. The second pipeline 34 passes through the casing 4 of the compressor (for example, it can be an orifice in the casing, only shown schematically) and is connected to the tooth groove inlet 62.

[0083] In this way, the fluid medium circulation system according to the present invention can realize the recycling of leaked fluid medium by simply setting up a first pipeline, a coaxial pump and a second pipeline, avoiding the leakage of fluid medium directly discharged into the environment and causing pollution problems, and also reducing the customer's operating cost losses by recycling the leaked oil.

[0084] During operation, under the pumping action of the coaxial pump 5, the fluid medium discharged from the drain port 3 of the mechanical seal structure 10 is transmitted to the inlet port 53 of the coaxial pump 5 via the first pipeline 33. At the output port 54 of the coaxial pump 5, it is transmitted to the tooth groove inlet 62 via the second pipeline 34 and flows into the closed tooth groove 6 of the screw rotor of the screw compressor 1. In this way, the fluid medium leaking from the mechanical seal structure 10 returns to the compressor body via the drain port 3, the first pipeline 33, the coaxial pump 5, and the second pipeline 34, thereby realizing the recycling of the fluid medium, thereby avoiding environmental pollution and reducing operating cost losses.

[0085] In addition to preventing lubricating oil leakage through the mechanical seal structure 10, the fluid medium circulation system according to the present disclosure can also prevent leaked lubricating oil from further leaking from the distal end of the mechanical seal cover plate through a leak-proof structure disposed within the mechanical seal cover plate. This further reduces or eliminates the leakage rate of the mechanical seal structure.

[0086] Herein, the distal end of the mechanical seal cover plate 19 refers to the end of the mechanical seal cover plate 19 that faces away from the compressor body 6. Such a leakage prevention structure may include a reservoir and / or a sealing component provided in the mechanical seal cover plate 19.

[0087] In one example, the anti-leakage structure may include a reservoir 31 disposed within the mechanical seal cover plate 19. Reservoir 31 is at least partially located below the rotor shaft 2 and is configured to block access to the distal end of the mechanical seal cover plate 19 and to collect and store fluid medium leaking from the mechanical seal structure. Because at least a portion of the cavity of reservoir 31 is located below the rotor shaft 2, lubricating oil leaking from the mechanical seal structure 10 is drained and collected into reservoir 31 due to gravity. Furthermore, reservoir 31 blocks the lubricating oil from flowing directly to the distal end of the mechanical seal cover plate 19. Thus, the provision of the reservoir further prevents leaked lubricating oil from escaping from the distal end of the mechanical seal cover plate, thereby further reducing or eliminating the leakage rate of the mechanical seal structure.

[0088] In one example, the drain port 3 may be provided at the bottom of the reservoir 31 to ensure that lubricating oil leaking from the mechanical seal structure 10 can be promptly discharged from the reservoir 31 via the drain port 3. This prevents excessive lubricating oil from overflowing from the distal end of the mechanical seal cover plate.

[0089] In another example, to prevent lubricating oil from leaking from the distal end of the mechanical seal cover plate 19 into the environment, the leakage prevention structure may include a sealing member 32 disposed within the distal end of the mechanical seal cover plate 19, surrounding the rotor shaft 2. The sealing member 32 may have any feasible structure. Specifically, the sealing member 32 may be a lip seal having a conventional structure.

[0090] In yet another example, the leakage prevention structure may include a reservoir 31 and a sealing member 32. The sealing member 32 is disposed adjacent to the reservoir 31 and around the rotor shaft 2 in the distal end of the mechanical seal cover plate 19. Specifically, the sealing member 32 is disposed adjacent to the reservoir 31 and on the right side of the reservoir 31.

[0091] Furthermore, the storage tank 31 can have a storage volume of 36 ml ≤ V ≤ 72 ml (milliliters). This storage volume is primarily based on the oil leakage rate of screw compressors using mechanical seals in the industry, with some margin added to this value. A more appropriate storage volume can be set based on specific applications. This ensures that even if leakage occurs when the screw compressor is not operating, the storage volume will prevent the stored lubricating oil from overflowing from the distal end of the mechanical seal cover.

[0092] The reservoir 31 can have a structure that is easy to process, for example, a structure with a circular, rectangular, semicircular or polygonal cross section, to collect and store lubricating oil leaked from the mechanical seal structure 10. In this way, the reservoir 31 can provide a receiving space and block the passage to the distal end of the mechanical seal cover plate to prevent the lubricating oil from leaking from the distal end of the mechanical seal cover plate 19.

[0093] exist Figure 2 In the example shown, the reservoir 31 may have a circular configuration to facilitate machining.

[0094] In an example not shown, the storage tank 31 may have a semicircular configuration provided on the lower side of the rotor shaft 2. In this way, the processing cost of the mechanical seal cover plate can be reduced while ensuring the strength of the mechanical seal cover plate.

[0095] like Figure 2 and Figure 3 As shown, the coaxial pump 5 is disposed in the local space to the right of the mechanical seal cover plate 19. The coaxial pump 5 can be disposed adjacent to the mechanical seal cover plate 19 to provide a compact layout. The coaxial pump 5 can also be spaced apart from the mechanical seal cover plate 19. The coaxial pump 5 can be a coaxial oil pump mounted on the rotor shaft 2, eliminating the need for an additional pump driver.

[0096] The coaxial pump 5 includes a pump housing 51 secured to the casing 4 and an internal gear 52 housed within the pump housing 51. The internal gear 52 of the coaxial pump 5 is secured to the rotor shaft 2 with a key interposed therebetween. The rotor shaft 2 drives the internal gear 52 via the key, resulting in synchronized operation of the two. In other words, the operation of the rotor shaft 2 of the screw compressor 1 synchronously drives the coaxial pump 5, eliminating the need for a separate pump driver.

[0097] The cavity formed between the pump housing 51 and the internal gear 52 is used to receive lubricating oil transmitted from the first pipeline 33. The coaxial pump is provided with an inlet 53 and an outlet 54 on the pump housing 51 for receiving lubricating oil from the first pipeline 33 and pumping the input lubricating oil to the second pipeline 34. The rotor shaft 2 rotates the internal gear 52 via a key, thereby pushing the lubricating oil contained in the cavity between the pump housing 51 and the internal gear 52 to be delivered to the second pipeline 34 through the outlet 54. In this way, the coaxial pump 5 provides a pumping action to pump lubricating oil leaking from the mechanical seal structure 10 and circulate it back into the oil reservoir of the screw compressor 1.

[0098] The pump housing 51 of the coaxial pump 5 is fixed to the housing 4 via a connection structure. For example, the coaxial pump 5 can be fixed to the housing 4 via 2 to 3 protrusions (not shown) provided on the pump housing 51. The number of protrusions may be greater.

[0099] The present disclosure also relates to a compressor, which also includes a fluid medium circulation system according to the present disclosure. The compressor includes a compressor body 6, a rotor shaft 2, and a casing 4. The rotor shaft 2 extends from the compressor body 6 and is at least partially enclosed within the casing. A mechanical seal structure 10 is disposed around the rotor shaft 2 at the compressor suction end and between the rotor shaft and the casing. The fluid medium circulation system is configured to circulate fluid medium leaking from the mechanical seal structure.

[0100] Therefore, the compressor according to the present disclosure can prevent leakage and contamination of the fluid medium by using the fluid medium circulation system according to the present disclosure, and reduce the operating cost loss of the customer by recycling the leaked oil.

[0101] Compressor refrigerant oil typically enters the compressor through the main oil supply line for lubrication and cooling. As the compressor continues to operate, the temperature of the refrigerant oil entering the compressor increases. This necessitates the installation of an oil cooler to cool the refrigerant oil. However, this oil cooler typically requires the introduction of low-temperature refrigerant from the system to cool it, which can affect the refrigeration system and reduce overall system efficiency.

[0102] In a compressor, since low-temperature refrigerant enters the compressor from the suction end and high-temperature refrigerant is discharged from the compressor's exhaust end, the suction end temperature is relatively low. Thus, the refrigerant oil leaking from the suction end is relatively low in temperature and can be used to cool the refrigerant oil in the main oil circuit, thereby reducing the cooling capacity required by the oil cooler. Because the fluid medium leaking from the compressor suction end is inherently relatively low in temperature and suitable for heat exchange with the high-temperature oil in the main oil supply line, the low-temperature fluid medium transmitted from the second line of the fluid medium circulation system according to the present disclosure can be reused via a heat exchanger located adjacent to the compressor to cool the high-temperature refrigerant oil transmitted by the main oil supply line.

[0103] The present disclosure relates to a screw compressor 1 including a heat exchanger 7 positioned adjacent to the compressor body 6 and a main oil supply line 8 for supplying high-temperature refrigerant oil. A second line 34 carries low-temperature fluid leaking from the compressor suction port. The main oil supply line 8 and the second line 34 extend through the heat exchanger 7 before connecting to the compressor body 6, allowing the high-temperature refrigerant oil to exchange heat with the low-temperature fluid within the heat exchanger 7.

[0104] To this end, the compressor according to the present disclosure may include a heat exchanger 7. The heat exchanger 7 may be a small heat exchanger disposed adjacent to the compressor body 6. The heat exchanger may have a conventional structure and function, which will not be described in detail herein.

[0105] The second pipeline 34 extends through the heat exchanger 7 and the main oil supply pipeline 8 extends through the heat exchanger 7 so that the low-temperature lubricating oil in the second pipeline exchanges heat with the high-temperature refrigeration oil in the main oil supply pipeline 8, thereby cooling the high-temperature refrigeration oil.

[0106] Specifically, the second line 34 extends through the heat exchanger 7 before entering the reservoir (e.g., the closed slots of the screw rotor) within the compressor body 6 via the slot inlet 62. The main oil supply line 8 extends through the heat exchanger 7 before entering the screw compressor 1 via the main oil supply port 64. The main oil supply line 8 and the second line 34 exchange heat with each other at the heat exchanger 7, thereby fully utilizing the low-temperature fluid carried by the second line. In other words, the heat exchanger 7 is located upstream of the slot inlet 62 and the main oil supply port 64.

[0107] In this way, within heat exchanger 7, the low-temperature lubricating oil leaking from second pipeline 34 (i.e., being reused in the heat exchanger) exchanges heat with the main oil in main oil supply pipeline 8, thereby lowering the temperature of the main oil. This solves the compressor oil cooling problem to a certain extent. After entering screw compressor 1, the cooled main oil lubricates and cools the bearings, screw shaft, and other components, fully utilizing the oil cooling effect.

[0108] In addition, the present disclosure also relates to a fluid machine including the compressor according to the present disclosure.

[0109] Therefore, the fluid machinery according to the present disclosure can prevent leakage and contamination of the fluid medium by using the fluid medium circulation system according to the present disclosure, and reduce the operating cost loss of the customer by recycling the leaked oil.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all possible technical solutions that fall within the scope of the claims.

Claims

1. A fluid medium circulation system, characterized in that: The fluid medium circulation system includes a first pipeline, a coaxial pump, and a second pipeline. The coaxial pump is installed on a rotating shaft and is driven. The first pipeline is connected to the input port of the coaxial pump to receive and transmit the fluid medium leaked from the sealing structure. The second pipeline is connected to the output port of the coaxial pump to circulate the leaked fluid medium back into the fluid storage part.

2. The fluid medium circulation system according to claim 1, characterized in that: The sealing structure includes a mechanical sealing structure installed on a rotating shaft coaxially with the coaxial pump.

3. The fluid medium circulation system according to claim 2, characterized in that: The mechanical seal structure has a mechanical seal cover plate, and the first pipeline is connected to a drain port provided at a lower portion of the mechanical seal cover plate.

4. The fluid medium circulation system according to claim 3, characterized in that: The fluid medium circulation system further includes an anti-leakage structure arranged in the mechanical sealing cover plate.

5. The fluid medium circulation system according to claim 4, characterized in that: The anti-leakage structure includes a storage tank and / or a sealing component to prevent the leaked fluid medium from further leaking from the distal end of the mechanical seal cover plate.

6. The fluid medium circulation system according to claim 5, characterized in that: The reservoir is at least partially located below the rotating shaft and is configured to block a passage to a distal end of the mechanical seal cover plate and to collect and store fluid media leaked from the mechanical seal structure.

7. The fluid medium circulation system according to claim 6, characterized in that: The drain port is arranged at the bottom of the storage tank.

8. The fluid medium circulation system according to claim 5, characterized in that: The sealing component is disposed adjacent to the reservoir and around the rotation axis within the distal end of the mechanical seal cover plate.

9. The fluid medium circulation system according to claim 6, characterized in that: The storage volume of the reservoir is between 36 ml and 72 ml.

10. The fluid medium circulation system according to claim 6, characterized in that: The storage tank has a circular, rectangular, semicircular or polygonal cross section.

11. The fluid medium circulation system according to claim 10, characterized in that: The storage tank having a semicircular configuration is arranged around the rotation axis and on the lower side of the rotation axis.

12. The fluid medium circulation system according to any one of claims 1 to 11, characterized in that: The coaxial pump includes an internal gear fixed to a rotating shaft to rotate synchronously with the rotating shaft.

13. The fluid medium circulation system according to claim 12, characterized in that: The coaxial pump includes a pump housing fixed to a casing of a machine, the internal gear is accommodated in the pump housing, and the inlet and outlet are provided on the pump housing.

14. The fluid medium circulation system according to any one of claims 2 to 11, characterized in that: The mechanical seal structure further comprises a mechanical seal static ring, a mechanical seal dynamic ring, a static ring auxiliary seal, a dynamic ring auxiliary seal and an elastic force compensation mechanism to cooperatively provide a sealing effect.

15. A compressor, characterized in that: The compressor includes a fluid medium circulation system according to any one of claims 1-14.

16. The compressor according to claim 15, characterized in that The compressor includes a compressor body, a rotating shaft and a casing. The rotating shaft extends from the compressor body and is at least partially encapsulated in the casing. A mechanical seal structure is arranged around the rotating shaft between the rotating shaft and the casing at the suction end of the compressor. The fluid medium circulation system is configured to circulate the fluid medium leaked from the mechanical seal structure.

17. The compressor according to claim 16, characterized in that The compressor also includes a heat exchanger arranged adjacent to the compressor body and a main oil supply pipeline for supplying high-temperature refrigeration oil. The second pipeline of the fluid medium circulation system transports the low-temperature fluid medium leaked from the mechanical seal structure. The main oil supply pipeline and the second pipeline extend through the heat exchanger before being connected to the compressor body to allow the high-temperature refrigeration oil to exchange heat with the low-temperature fluid medium.

18. The compressor according to any one of claims 15 to 17, characterized in that The flow storage portion is a closed tooth groove of a screw rotor of the compressor, and the second pipeline is connected to a tooth groove inlet leading to the closed tooth groove of the screw rotor.

19. A fluid machine, characterized in that: The fluid machine includes the compressor according to any one of claims 15 to 18.

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