A compressor lubricated by refrigerant immersion

Abstract

The present invention discloses a compressor, comprising: a rotor; a bearing sleeved on the rotor; and a liquid storage tank capable of containing a refrigerant, and lubricating the bearing with the refrigerant having a lubricating effect. In the embodiment of the present invention, the refrigerant having a lubricating effect is carried by the liquid storage tank, and the refrigerant lubricates the bearing, while utilizing the heat conduction and lubrication effects of the refrigerant, thereby simplifying the lubrication system in the compressor.

Description

Technical Field

[0001] The invention relates to the field of refrigeration and air conditioning, and in particular to a compressor lubricated by refrigerant immersion. Background Art

[0002] For general rotating machinery, the lubrication of the rotating parts will play a decisive role in the normal operation of the rotating machinery. And because the bearing is a key part of the rotating parts, in order to ensure its good lubrication, it is necessary to continuously provide lubricating fluid for lubrication. Existing rotating machinery mostly uses independently set lubrication systems to lubricate different parts. The lubrication system at least includes a liquid storage tank, a connecting pipeline, a pressure pump, a nozzle and other components.

[0003] The lubrication of bearings of related rotating machinery mostly adopts the method of spraying lubricating liquid from nozzles. To ensure the lubrication effect, the lubricating liquid entering the nozzle needs to have a certain pressure. Therefore, the lubrication system needs to use a pressure pump driven by a motor as a pressure source to pressurize the lubricating liquid. In order to prevent the lubrication system from continuing to provide lubricating liquid with sufficient pressure to the nozzle in the event of a power outage, the lubrication system also needs to be equipped with a high-level liquid storage tank, which is used to continue to provide lubricating liquid with sufficient pressure to achieve the idling of the rotating machinery after the lubrication system stops supplying lubricating liquid.

[0004] In addition to good lubrication of the rotating parts in the rotating machinery, designers also need to focus on its temperature indicators and provide a reasonable cooling method for the bearings. The relevant lubrication system mostly directly absorbs the heat of the bearings through the lubricating fluid, and then uses a heat exchanger to make the lubricating fluid self-circulate, continuously exporting the heat of the bearings. However, due to the low thermal conductivity of the general lubricating fluid, the heat exchange efficiency is not high, and the additional heat exchanger will further complicate the lubrication system and increase the manufacturing and maintenance costs.

[0005] like Figure 1 The figure shows a schematic diagram of an existing bearing lubrication system. The lubricating liquid is pumped out from the liquid storage tank by a hydraulic pump, flows to the high-position liquid storage tank after being cooled by a plate heat exchanger, and then the lubricating liquid in the high-position liquid storage tank is sprayed to the bearing through a nozzle. The figure omits the collection of the sprayed lubricating liquid, the filtration of the lubricating liquid, and the flow path of guiding it back to the liquid storage tank. Figure 1 The lubrication system shown has a complex structure, and the lubrication performance of the bearing is affected by the comprehensiveness and uniformity of the nozzle spray, so the lubrication effect is difficult to guarantee, and the cooling effect of the lubricating liquid on the bearing is limited, making it difficult to achieve good lubrication and heat dissipation of the bearing. Summary of the invention

[0006] At least one object of the present invention is to provide a compressor lubricated by refrigerant immersion, which can simplify the lubrication system in the compressor. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects as described below.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A compressor provided by the present invention comprises: a rotor; a bearing sleeved on the rotor; and a liquid storage tank, which is coated on the outside of the bearing and can accommodate and lubricate the bearing through a refrigerant with a lubricating effect.

[0009] As an optimization of any technical solution or any optimized technical solution provided before or after the present invention, the liquid storage tank includes: an axial hole for allowing the rotor to pass through the liquid storage tank; a refrigerant inlet for guiding the liquid refrigerant into the liquid storage tank; and a refrigerant outlet for guiding the refrigerant that has absorbed heat to leave the liquid storage tank.

[0010] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigeration compressor includes: a hydraulic pump connected to the refrigerant inlet, capable of pressurizing the refrigerant and pumping the liquid refrigerant into the liquid storage tank.

[0011] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigerant outlet is not lower than the bearing, so that the bearing can be at least partially immersed in the refrigerant in the liquid storage tank.

[0012] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigerant outlet is further set to be not lower than the rotor; the rotor includes: a liquid lifting structure, which can lift the liquid refrigerant in the liquid storage tank as the rotor rotates to lubricate the part of the bearing that is higher than the liquid refrigerant in the liquid storage tank.

[0013] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the liquid lifting structure includes: a wedge-shaped groove, which is opened on the outer peripheral surface of the rotor, and the depth of the wedge-shaped groove gradually decreases along the rotation direction of the rotor.

[0014] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigeration compressor includes: a pressure sensor for detecting the pressure inside the liquid storage tank; and a solenoid valve capable of controlling the opening and closing of the refrigerant outlet according to the detection result of the pressure sensor so that the pressure in the liquid storage tank is within a set range.

[0015] As an optimization of any technical solution or any optimized technical solution provided before or after the present invention, the setting range is set to enable the refrigerant that has absorbed heat to vaporize, and the refrigerant outlet is arranged above the refrigerant inlet so as to discharge the refrigerant in a gaseous state.

[0016] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigeration compressor includes: a shaft hole sealing structure, which is arranged in the shaft hole and is used to seal the gap between the rotor and the liquid storage tank.

[0017] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the shaft hole sealing structure includes: a comb tooth seal, which is arranged on the mating surface between the shaft hole sealing structure and the rotor along the axial direction of the rotor.

[0018] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigeration compressor includes: a filtering device connected to the refrigerant outlet, for filtering the refrigerant leaving the liquid storage tank so that the refrigerant leaving the liquid storage tank can continue to participate in the refrigerant circulation of the refrigeration compressor.

[0019] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigeration compressor includes: a nozzle, located in the liquid storage tank and connected to the refrigerant inlet, capable of splashing the liquid refrigerant entering the liquid storage tank after being pressurized by the hydraulic pump onto the bearing.

[0020] Based on the above technical solution, the embodiment of the present invention carries the refrigerant with lubricating effect through the liquid storage tank, and allows the refrigerant to lubricate the bearing, while utilizing the heat conduction and lubrication effects of the refrigerant, thereby simplifying the lubrication system in the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic diagram of the cooling flow path structure of a compressor bearing provided by the prior art;

[0023] Figure 2 A schematic diagram of a cooling flow path structure of a compressor bearing through refrigerant immersion lubrication provided by an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the rotor wedge slot structure provided in an embodiment of the present invention.

[0025] Figure numerals: 1. Cooling flow path of compressor bearing in prior art, 11. Hydraulic pump, 12. Heat exchanger, 13. High-position liquid storage tank, 14. Nozzle, 15. Rotor, 16. Bearing, 2. Cooling flow path of compressor bearing in embodiment of the present invention, 21. Rotor, 22. Bearing, 23. Liquid storage tank, 24. Refrigerant inlet, 25. Refrigerant outlet, 26. Hydraulic pump, 27. Solenoid valve, 28. Shaft hole sealing structure, 29. Wedge groove. DETAILED DESCRIPTION

[0026] The content of the present invention and the differences between the present invention and the prior art can be understood by referring to the accompanying drawings and text content. The technical solution (including the preferred technical solution) of the present invention is further described in detail below by means of the accompanying drawings and listing some optional embodiments of the present invention.

[0027] It should be noted that any technical feature and any technical solution in the present embodiment are one or several of multiple optional technical features or optional technical solutions. For the sake of brevity, this document cannot list all the alternative technical features and alternative technical solutions of the present invention, nor is it convenient to emphasize that each implementation method of each technical feature is one of multiple optional implementation methods. Therefore, those skilled in the art should know that any technical means provided by the present invention can be replaced or any two or more technical means or technical features provided by the present invention can be combined with each other to obtain a new technical solution.

[0028] Any technical features and any technical solutions in this embodiment do not limit the protection scope of the present invention. The protection scope of the present invention should include any alternative technical solutions that can be thought of by those skilled in the art without creative work, as well as new technical solutions obtained by those skilled in the art by combining any two or more technical means or technical features provided by the present invention.

[0029] The following is combined with Figure 1 The technical solution provided by the present invention is described in more detail.

[0030] like Figure 1 As shown, a compressor provided by the present invention includes: a rotor 21; a bearing 22 mounted on the rotor 21; and a liquid storage tank 23, which is coated on the outside of the bearing 22 and can accommodate and lubricate the bearing 22 through a refrigerant with a lubricating effect.

[0031] By arranging the bearing 22 inside the liquid storage tank 23 and allowing the liquid storage tank 23 to contain a sufficiently high amount of refrigerant with lubricating effect, the bearing 22 can be always well lubricated. In particular, when the lubrication system is powered off or the pressure source fails, the bearing 22 lubricated by immersion can continue to be well lubricated by the refrigerant in the liquid storage tank 23. Therefore, the arrangement of the liquid storage tank 23 eliminates the pressure pump and the high-position liquid storage tank 23 in the original lubrication system, and can keep the bearing 22 working well when the pressure in the lubrication system is insufficient.

[0032] In addition, the refrigerant with lubricating effect can effectively absorb the heat of the bearing 22 while lubricating it well, so that it can always be kept at a suitable working temperature, thanks to its high thermal conductivity as a refrigerant. The heat of the bearing 22 or the rotor 21 can be conducted by the refrigerant and transferred to the liquid storage tank 23 with a larger heat dissipation surface area, thereby transferring the heat dissipated by the rotating machinery out of the compressor. Furthermore, corresponding fins can be set on the surface of the liquid storage tank 23 to conduct the heat inside the liquid storage tank 23 more quickly.

[0033] It should be noted that Figure 1 The relative positional relationship between the liquid storage tank 23, the rotor 21 and the bearing 22 is only schematically drawn, and thus the supporting structure for the bearing 22 is omitted. Based on this, the bearing 22 can be directly supported by the liquid storage tank 23, or a corresponding supporting structure can be provided in the liquid storage tank 23 to realize the connection and support relationship between the bearing 22 and the liquid storage tank 23.

[0034] Furthermore, the concept of the liquid storage tank 23 can also be extended to the compressor, that is, the entire rotor 21 of the compressor, all bearings 22 on the rotor 21, and other rotating parts that need to be lubricated are all exposed to the refrigerant with lubricating effect through the liquid storage tank 23. Therefore, the liquid storage tank 23 can be a single independent structure, for example, multiple liquid storage tanks 23 are set, and the multiple liquid storage tanks 23 are respectively located outside various parts that need to be lubricated; or according to the shape and distribution of the parts to be lubricated, some of the liquid storage tanks 23 of the independent structure can be selectively merged to simplify the lubrication system; or the compressor casing can be directly used as the liquid storage tank 23 to lubricate and cool all the parts in the compressor to the greatest extent.

[0035] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the liquid storage tank 23 includes: an axial hole, used to allow the rotor 21 to pass through the liquid storage tank 23; a refrigerant inlet 24, used to guide the liquid refrigerant into the liquid storage tank 23; and a refrigerant outlet 25, used to guide the refrigerant that has absorbed heat to leave the liquid storage tank 23.

[0036] Compared with the method of dissipating heat through the closed liquid storage tank 23 and the refrigerant therein, the embodiment of the present invention can also set a refrigerant inlet 24 and a refrigerant outlet 25 in the liquid storage tank 23, so that the liquid storage tank 23 forms an open container for the refrigerant. The open liquid storage tank 23 can be further set in the refrigerant cycle, so as to control the state and temperature of the refrigerant entering the liquid storage tank 23, and achieve better lubrication and cooling of the bearing 22.

[0037] In addition, by means of the refrigerant inlet 24 and the refrigerant outlet 25 provided on the liquid storage tank 23, the liquid level of the refrigerant in the liquid storage tank 23 can also be controlled. Specifically, by controlling the flow difference between the refrigerant inlet 24 and the refrigerant outlet 25, the liquid level in the liquid storage tank 23 can be directly adjusted, and by providing flow meters at the refrigerant inlet 24 and the refrigerant outlet 25, the refrigerant volume in the liquid storage tank 23 can be indirectly calculated.

[0038] Furthermore, when the refrigerant is easily vaporized by absorbing heat, the pressure of the gaseous refrigerant in the liquid storage tank 23 can be further controlled by controlling the opening and closing of the refrigerant inlet 24 and the refrigerant outlet 25 .

[0039] In order to ensure that the refrigerant entering the liquid storage tank 23 can achieve good lubrication effect on the bearing 22 in liquid state, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigeration compressor includes: a hydraulic pump 26, connected to the refrigerant inlet 24, capable of pressurizing the refrigerant and pumping the liquid refrigerant into the liquid storage tank 23.

[0040] Since the refrigerant in the compressor usually has good phase change ability during the heat absorption and release process, its state can be easily changed by pressurizing it, so a hydraulic pump 26 is correspondingly provided at the refrigerant inlet 24 of the liquid storage tank 23, which can change its state by pressurizing the refrigerant. In addition, for a lubrication system that requires a refrigerant of a certain pressure, the hydraulic pump 26 can further pressurize the refrigerant on the basis of liquefying the refrigerant, so that the refrigerant has a better lubrication effect.

[0041] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigerant outlet 25 is not lower than the bearing 22 so that the bearing 22 can be at least partially immersed in the refrigerant in the liquid storage tank 23.

[0042] When the bearing 22 is at least partially immersed in the refrigerant in the liquid storage tank 23, the refrigerant is brought to the portion of the bearing 22 and the rotor 21 that are not immersed in the refrigerant through the rotation of the bearing 22, so that the bearing 22 and the rotor 21 can be well lubricated in the entire 360° range. In addition, in the case where the hydraulic pump 26 cannot normally pressurize and liquefy the refrigerant, the bearing 22 can continue to be lubricated by the refrigerant already contained in the liquid storage tank 23 to maintain the lubrication effect during the unpowered rotation period (idling period) of the rotor 21.

[0043] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigerant outlet 25 is further set to be no lower than the rotor 21; the rotor 21 includes: a liquid lifting structure, which can lift the liquid refrigerant in the liquid storage tank 23 as the rotor 21 rotates to lubricate the part of the bearing 22 that is higher than the liquid refrigerant in the liquid storage tank 23.

[0044] The refrigerant outlet 25 is further arranged to be not lower than the rotor 21, so that the liquid level of the refrigerant in the liquid storage tank 23 can be at least not lower than the rotor 21. At this time, the liquid lifting structure can be arranged in the circumference of the rotor 21, so as to lift up and splash the liquid refrigerant in the liquid storage tank 23 to the rotor 21 and the part of the bearing 22 that is not immersed in the refrigerant.

[0045] The liquid-raising structure may be configured as an impeller arranged along the circumference of the rotor 21, for raising the liquid refrigerant in the liquid storage tank 23. The impellers are preferably evenly arranged along the circumference of the rotor 21 to prevent the rotation center of the rotor 21 from deviating from the rotation axis of the rotor 21 during the rotation process. In addition, considering that the impeller as a liquid-raising structure has a large resistance during the rotation process, at this time, according to the lubrication needs of the rotor 21 and the bearing 22, an impeller as short as possible should be provided to avoid generating a large resistance during the high-speed rotation of the rotor 21.

[0046] like Figure 3 As shown, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the liquid lifting structure includes: a wedge-shaped groove 29, which is opened on the outer peripheral surface of the rotor 21, and the depth of the wedge-shaped groove 29 gradually decreases along the rotation direction of the rotor 21.

[0047] Since the wedge-shaped groove 29 is a liquid-lifting structure embedded in the rotor 21, it has smaller flow resistance than an external liquid-lifting structure and can be applied to a rotor 21 structure that rotates at a higher speed. Based on this, during the continuous operation of the rotor 21, the wedge-shaped groove 29 is subjected to less force than the liquid-lifting structure of the impeller, and is less likely to be deformed by twisting, bending, etc., and performs better in a continuous working environment.

[0048] In addition, by setting the wedge-shaped groove 29 so that the depth gradually decreases with the rotation direction of the rotor 21, the resistance of the wedge-shaped groove 29 during the liquid lifting process can be further reduced, and the effect of liquid lifting can be improved as much as possible. Specifically, the wedge-shaped groove 29 with a relatively small groove depth first contacts the refrigerant, and the resistance surface is small. When the refrigerant enters the wedge-shaped groove 29, it can fit the wedge-shaped groove 29 with as little flow loss as possible, and fill the internal space of the wedge-shaped groove 29 as much as possible. As the rotor 21 rotates further, the groove depth of the wedge-shaped groove 29 gradually increases, which can accommodate more refrigerant, and the refrigerant is lifted up by the blocking effect of the larger resistance surface, thereby enhancing the cooling effect of the refrigerant from the volume and height of the lifted refrigerant, so that more parts that need lubrication and are farther away from the refrigerant liquid level in the liquid storage tank 23 can contact the refrigerant with lubricating effect lifted up by the liquid lifting structure.

[0049] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigeration compressor includes: a pressure sensor for detecting the pressure inside the liquid storage tank 23; and a solenoid valve 27, which can control the opening and closing of the refrigerant outlet 25 according to the detection result of the pressure sensor to ensure that the pressure in the liquid storage tank 23 is within a set range.

[0050] For refrigeration compressors, the working medium that transfers heat is often a refrigerant that is easily vaporized when absorbing heat. Refrigerants with this characteristic can take away a large amount of heat by virtue of their latent heat of vaporization during the vaporization process, and the refrigerant in a gaseous state after absorbing heat can be converted back into a liquid refrigerant with a higher temperature by compressing the volume, thereby improving the efficiency of transferring heat out of the system.

[0051] However, the refrigerant that easily vaporizes after absorbing heat will also cause a relatively high pressure in the liquid storage tank 23 which is in a basically closed state. The relatively high pressure will not only reduce the latent heat of vaporization during the vaporization process of the refrigerant and reduce the cooling efficiency of the refrigerant, but will also affect the safe operation of the liquid storage tank 23 and some of the components therein.

[0052] In summary, it is necessary to control the pressure in the liquid storage tank 23. In the embodiment of the present invention, a pressure sensor is provided to monitor the pressure in the liquid storage tank 23 in real time, and a corresponding solenoid valve 27 is provided at the refrigerant outlet 25 of the liquid storage tank 23, so that when the pressure in the liquid storage tank 23 exceeds the allowable value, the solenoid valve 27 is opened to release the excessive pressure.

[0053] For the liquid storage tank 23 where gas and liquid coexist, on the one hand, the temperature and pressure in the liquid storage tank 23 are affected by the heat conduction of the refrigerant, and on the other hand, the evaporation point of the refrigerant is also affected by the temperature and pressure in the liquid storage tank 23. Therefore, the thermal analysis of the liquid storage tank 23 is as follows: as the low-temperature liquid refrigerant is injected into the liquid storage tank 23 and absorbs the heat of the rotor 21 and the bearing 22, it rises to a specific temperature. At this temperature, part of the liquid refrigerant is vaporized, and until all the liquid refrigerant is vaporized, the liquid storage tank 23 will always remain at the evaporation point temperature of the refrigerant. As more gaseous refrigerant is produced during the vaporization of the refrigerant, the pressure in the liquid storage tank 23 increases accordingly. As the pressure in the liquid storage tank 23 gradually increases, the evaporation point temperature of the liquid refrigerant inside the liquid storage tank 23 also increases, causing the overall temperature of the gaseous and liquid refrigerants in the liquid storage tank 23 to rise.

[0054] For the refrigerant in a dynamic equilibrium state (the temperature in the liquid storage tank 23 is higher than the evaporation point temperature under normal pressure), if the heat absorbed by the refrigerant from the rotor 21 and the bearing 22 is greater than the heat dissipation of the liquid storage tank 23, the pressure and temperature in the liquid storage tank 23 will rise synchronously and always remain in a dynamic thermal equilibrium between the gas and liquid phases. Based on this, the relationship between the simultaneous rise and fall of the temperature and pressure of the refrigerant in a dynamic thermal equilibrium state can be utilized to indirectly control the temperature of the refrigerant therein by controlling the pressure in the liquid storage tank 23, so that the rotor 21 and the bearing 22 in the liquid storage tank 23 always operate within the allowable temperature range.

[0055] Furthermore, in order to prevent extremely high pressure from affecting the liquid storage tank 23 and the rotor 21 and the bearing 22 inside the liquid storage tank 23, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the setting range is set to enable the refrigerant that has absorbed heat to vaporize, and the refrigerant outlet 25 is arranged above the refrigerant inlet 24 so as to discharge the refrigerant in a gaseous state.

[0056] As an optimization of any technical solution or any optimized technical solution provided above or below the present invention, the refrigeration compressor includes: a shaft hole sealing structure 28, which is arranged in the shaft hole and is used to seal the gap between the rotor 21 and the liquid storage tank 23.

[0057] The shaft hole may be sealed by a sealing ring sleeved on the rotor 21 , or a sealing ring provided on the shaft hole or the rotor 21 , so as to prevent the refrigerant from leaking from the gap between the rotor 21 and the liquid storage tank 23 .

[0058] For the high-speed rotating rotor 21 and the high-pressure environment in the liquid storage tank 23, as an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the shaft hole sealing structure 28 includes: a comb tooth seal, which is arranged on the mating surface between the shaft hole sealing structure 28 and the rotor 21 along the axial direction of the rotor 21.

[0059] The comb teeth seal forms a clearance fit with the shaft hole through the comb teeth structure arranged side by side, which can better adapt to the sealing object of the rotation of the compressor rotor 21 in the embodiment of the present invention and prevent internal pressure leakage.

[0060] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigeration compressor includes: a filtering device, connected to the refrigerant outlet 25, for filtering the refrigerant leaving the liquid storage tank 23, so that the refrigerant leaving the liquid storage tank 23 can continue to participate in the refrigerant circulation of the refrigeration compressor.

[0061] For the refrigerant that is always in liquid state, during the process of cooling and lubricating the rotor 21 and the bearing 22, it will be coked or contain some impurities due to friction, high temperature, etc. Therefore, for the compressor in which the refrigerant in the liquid storage tank 23 enters the refrigerant circulation, it is necessary to install a filtering device at the outlet of the liquid storage tank 23 to filter the refrigerant leaving the liquid storage tank 23 so that it can meet the use requirements in other components of the compressor.

[0062] As an optimization of any technical solution or any optimized technical solution provided in the foregoing or later text of the present invention, the refrigeration compressor includes: a nozzle, located in the liquid storage tank 23 and connected to the refrigerant inlet 24, capable of splashing the liquid refrigerant entering the liquid storage tank 23 after being pressurized by the hydraulic pump 26 onto the bearing 22.

[0063] Through the pressurizing effect of the hydraulic pump 26, a nozzle can be correspondingly arranged in the liquid storage tank 23 to directly spray the refrigerant to the bearing 22, so as to achieve lubrication of the bearing 22 and the rotor 21 at more angles and with a larger coverage. Moreover, at this time, even if the hydraulic pump 26 cannot continue to pressurize the refrigerant entering the liquid storage tank 23 and make it sprayed by the nozzle, the rotor 21 and the bearing 22 can continue to be lubricated by the refrigerant stored in the liquid storage tank 23, so that the compressor can continue to maintain a good lubrication effect in the event of a failure such as power failure.

[0064] In order for the nozzle to control the lubricating liquid to lubricate the bearing 22 or the rotor 21 comprehensively and evenly, in addition to ensuring the pressure of the refrigerant entering the nozzle, the nozzle also needs to be set at a position corresponding to the bearing 22 and the rotor 21, for example, at the top of the liquid storage tank 23, and facing the rotor 21 and the bearing 22.

[0065] Based on the above technical solution, the embodiment of the present invention carries the refrigerant with lubricating effect through the liquid storage tank 23, and allows the refrigerant to lubricate the bearing 22, while utilizing the heat conduction and lubrication effects of the refrigerant, thereby simplifying the lubrication system in the compressor.

[0066] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0067] If the words "first", "second" and so on are used in this article to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components. Unless otherwise stated, the above words have no special meaning.

[0068] At the same time, if the above-mentioned invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0069] In addition, the terms used in any technical solution disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them unless otherwise stated. Any component provided by the present invention may be assembled from multiple separate components or may be a separate component manufactured by an integrated molding process.

[0070] If the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are used in the description of the present invention, the orientation or position relationship indicated by the above terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device, mechanism, component or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A compressor, characterized in that: include: Rotor; A bearing sleeved on the rotor; as well as A liquid storage tank, which is coated on the outside of the bearing and can contain and lubricate the bearing through a refrigerant having a lubricating effect; Wherein, the liquid storage tank comprises: an axial hole, used for allowing the rotor to pass through the liquid storage tank; A refrigerant inlet, used to guide the liquid refrigerant into the liquid storage tank; and A refrigerant outlet, used to guide the refrigerant that has absorbed heat to leave the liquid storage tank; Wherein, the compressor further comprises: A pressure sensor, used to detect the pressure inside the liquid storage tank; and a solenoid valve capable of controlling the opening and closing of the refrigerant outlet according to the detection result of the pressure sensor so that the pressure in the liquid storage tank is within a set range, the set range being set so that the refrigerant that has absorbed heat can be vaporized, and the refrigerant outlet is arranged above the refrigerant inlet so as to discharge the refrigerant in a gaseous state; The refrigerant outlet is not lower than the bearing so that the bearing can be at least partially immersed in the refrigerant in the liquid storage tank, and the bearing is configured to bring the refrigerant to the bearing and rotor areas that are not immersed in the refrigerant through rotation.

2. The compressor according to claim 1, characterized in that The compressor comprises: The hydraulic pump is connected to the refrigerant inlet, and is capable of pressurizing the refrigerant and pumping the refrigerant in liquid form into the liquid storage tank.

3. The compressor according to claim 1, characterized in that The refrigerant outlet is further arranged to be not lower than the rotor; The rotor comprises: The liquid lifting structure can lift the liquid refrigerant in the liquid storage tank as the rotor rotates to lubricate the portion of the bearing that is higher than the liquid refrigerant in the liquid storage tank.

4. The compressor according to claim 3, characterized in that The liquid lifting structure comprises: The wedge-shaped groove is opened on the outer peripheral surface of the rotor, and the depth of the wedge-shaped groove gradually decreases along the rotation direction of the rotor.

5. The compressor according to claim 1, characterized in that The compressor comprises: The shaft hole sealing structure is arranged at the shaft hole and is used for sealing the gap between the rotor and the liquid storage tank.

6. The compressor according to claim 5, characterized in that The shaft hole sealing structure comprises: The comb teeth seal is arranged along the axial direction of the rotor on the matching surface between the shaft hole sealing structure and the rotor.

7. The compressor according to claim 1, characterized in that include: The filter device is connected to the refrigerant outlet and is used to filter the refrigerant leaving the liquid storage tank so that the refrigerant leaving the liquid storage tank can continue to participate in the refrigerant circulation of the compressor.

8. The compressor according to claim 2, characterized in that include: The nozzle is located in the liquid storage tank and connected to the refrigerant inlet, and can spray the liquid refrigerant entering the liquid storage tank after being pressurized by the hydraulic pump onto the bearing.

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