Refrigerating and heating device of megawatt supercritical COcentrifugal compressor

Abstract

The utility model relates to a refrigerating and heating device of a megawatt supercritical CO2 centrifugal compressor, which comprises a shell, a rotating shaft and a gear, two third round holes are arranged in the gear, and two ends of each third round hole extend out of the gear; one end of the rotating shaft extends out of the shell, an oil injection hole is formed in the rotating shaft, and the oil injection hole communicates with the third round hole, so that lubricating oil is injected to the surface of the gear from the oil injection hole to lubricate the gear; due to the fact that the third round hole is formed in the gear and communicated with the first round hole and the second round hole, direct injection of lubricating oil is achieved, it is guaranteed that the gear can be fully lubricated all the time in the high-speed running process, friction between gear contact faces is remarkably reduced, noise and vibration are reduced, and the overall stability of a system is improved.

Description

Technical Field

[0001] This utility model belongs to the field of refrigeration and heating technology, and relates to a device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor. Background Technology

[0002] Against the backdrop of global climate change, CO2, as a recognized major source of greenhouse gas emissions, has become a key strategy for mitigating global warming and reducing environmental pollution through its effective management and recycling. Compared to traditional refrigerants, CO2 exhibits significant environmental friendliness and thermodynamic advantages. It boasts excellent thermodynamic properties, high gas density, low liquid viscosity, and relatively low critical parameters (specifically, a working pressure of 7.38 MPa and a critical temperature of 31.4 °C). These characteristics make CO2 particularly prominent in the fields of refrigeration and heating. Furthermore, CO2 is easy to store, has strong work capacity, high heat transfer efficiency, and is safe and non-toxic, further expanding its potential in practical applications.

[0003] In megawatt-level supercritical CO2 centrifugal compressor systems, the gear transmission system plays a crucial role. It is responsible for accurately and efficiently transmitting the powerful force provided by the motor to the compressor rotor, thereby driving the entire refrigeration and heating cycle. However, in actual operation, the gear transmission system faces many challenges. In particular, when the gears are poorly lubricated, the friction between the gear contact surfaces increases sharply, resulting in significant noise and vibration. This not only affects the overall stability of the system but also poses a potential threat to the surrounding environment and the physical and mental health of the operators. Utility Model Content

[0004] The purpose of this invention is to provide a megawatt-level supercritical CO2 centrifugal compressor for refrigeration and heating, which can solve the problems mentioned in the background art.

[0005] According to the technical solution provided by this utility model: a megawatt-level supercritical CO2 centrifugal compressor for refrigeration and heating includes a housing, a rotating shaft, and a gear. The gear has two third circular holes inside, and the gear extends out from both ends of the third circular holes. One end of the rotating shaft extends out of the housing, and an oil injection hole is provided inside the rotating shaft. The oil injection hole communicates with the third circular holes so that lubricating oil can be injected from the oil injection hole onto the surface of the gear to lubricate the gear.

[0006] Preferably, four slots are circumferentially formed at equal intervals on the inner wall of the gear, and the opposite ends of the third circular hole are located in two of the slots.

[0007] Preferably, the rotating shaft includes a main shaft and a short shaft. One end of the main shaft is located inside the gear, and the other end is rotatably connected to the housing. The end of the main shaft is provided with a short shaft, one end of which extends out of the housing.

[0008] Preferably, the main shaft is provided with four locking blocks, each of which is adapted to a locking slot.

[0009] Preferably, the oil injection hole includes a first circular hole and a second circular hole, which are T-shaped. The other end of the first circular hole is connected to a third circular hole. One end of the second circular hole is connected to the third circular hole, and the other end is flush with the extension end of the short shaft.

[0010] Preferably, the gear has four limiting grooves, and each locking block is provided with a limiting block, which is adapted to the limiting groove.

[0011] Preferably, the card block has an inclined surface to facilitate quick engagement between the card block and the card slot.

[0012] The positive and progressive effects of this application are as follows:

[0013] The present invention provides a megawatt-level supercritical CO2 centrifugal compressor device for refrigeration and heating, which has the following advantages:

[0014] 1. By opening a third circular hole on the gear, which communicates with the first and second circular holes, direct injection of lubricating oil is achieved, thereby ensuring that the gear can always be adequately lubricated during high-speed operation, significantly reducing friction between gear contact surfaces, reducing noise and vibration, and improving the overall stability of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the outer shell of this utility model.

[0016] Figure 2 This is a schematic diagram of the main shaft of this utility model.

[0017] Figure 3 This is a schematic diagram of the gear and main shaft of this utility model not being connected.

[0018] Figure 4 yes Figure 3 Enlarged view of the structure at point A in the middle.

[0019] Figure 5 yes Figure 3 Enlarged view of the structure at point B in the middle.

[0020] Figure 6 This is a schematic diagram of the main shaft section of this utility model.

[0021] Figure 7 This is a three-dimensional view of the gear of this utility model.

[0022] In the figure: outer shell 1; main shaft 2; locking block 21; limiting block 22; first round hole 23; second round hole 24; short shaft 25; inclined surface 26; gear 31; locking groove 32; limiting groove 33; third round hole 34. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] like Figure 1-7 As shown, this utility model is a megawatt-level supercritical CO2 centrifugal compressor for refrigeration and heating, including a housing 1, a rotating shaft, and a gear 31. The gear 31 has two third circular holes 34 inside, and the gear 31 extends out from both ends of the third circular holes 34. One end of the rotating shaft extends out of the housing 1, and an oil injection hole is provided inside the rotating shaft. The oil injection hole communicates with the third circular holes 34 so that lubricating oil can be injected from the oil injection hole onto the surface of the gear 31 to lubricate the gear 31.

[0026] By opening a third circular hole 34 on the gear 31 and communicating with the first circular hole 23 and the second circular hole 24, the direct injection of lubricating oil is realized, thereby ensuring that the gear can always be fully lubricated during high-speed operation, significantly reducing the friction between the gear contact surfaces, reducing the generation of noise and vibration, and improving the overall stability of the system.

[0027] The gear 31 has four slots 32 circumferentially arranged at equal intervals on its inner wall, and the opposite ends of the third circular hole 34 are located in two of the slots 32.

[0028] The rotating shaft includes a main shaft 2 and a short shaft 25. One end of the main shaft 2 is located inside the gear 31, and the other end is rotatably connected to the housing 1. The end of the main shaft 2 is provided with a short shaft 25, one end of which extends out of the housing 1, making the extended end of the short shaft 25 flush with the housing 1. The extended end of the short shaft 25 is provided with a cover plate to prevent external dust from entering the second circular hole 24. The connection stability between the gear and the short shaft 25 is enhanced: by designing the matching structure of the slot 32 and the block 21, as well as the matching design of the limiting slot 33 and the limiting block 22, the connection stability between the gear 31 and the short shaft 25 is enhanced. This not only improves the operating efficiency of the entire device, but also ensures that the gear 31 will not generate additional vibration and noise due to loose connection during high-speed operation.

[0029] The main shaft 2 is provided with four locking blocks 21, each of which is adapted to the slot 32. The inclined surface designed on the locking block 21 allows the locking block 21 and the slot 32 to quickly engage, thereby simplifying the installation process of the entire device. This not only improves work efficiency but also reduces installation costs.

[0030] The oil injection hole includes a first circular hole 23 and a second circular hole 24. The first circular hole 23 and the second circular hole 24 are T-shaped. The other end of the first circular hole 23 is connected to the third circular hole 34. One end of the second circular hole 24 is connected to the third circular hole 34, and the other end is flush with the extension end of the short shaft 25. The T-shaped design of the oil injection hole allows the lubricating oil to have a buffering and distribution process before entering the gear. This not only ensures the uniform distribution of the lubricating oil, but also improves the delivery efficiency of the lubricating oil, so that the gear 31 can be fully lubricated more quickly.

[0031] The gear 31 has four limiting grooves 33, and each locking block 21 is provided with a limiting block 22. The limiting block 22 is adapted to the limiting groove 33. When the limiting block 22 touches the bottom of the limiting groove 33, the second round hole 24 and the third round hole 34 are located on the same vertical line, so that the two are connected.

[0032] The card block 21 is provided with an inclined surface 26 to facilitate quick engagement between the card block 21 and the card slot 32.

[0033] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this utility model, and the utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A device for refrigeration and heating using a megawatt-class supercritical CO2 centrifugal compressor, characterized in that, The device includes a housing (1), a rotating shaft, and a gear (31). The gear (31) has two third circular holes (34) inside, and both ends of the third circular holes (34) extend out of the gear (31). One end of the rotating shaft extends out of the housing (1), and an oil injection hole is provided inside the rotating shaft. The oil injection hole communicates with the third circular holes (34) so ​​that lubricating oil can be injected from the oil injection hole onto the surface of the gear (31) to lubricate the gear (31).

2. The device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor as described in claim 1, characterized in that: The gear (31) has four slots (32) circumferentially arranged at equal intervals on its inner wall, and the opposite ends of the third circular hole (34) are located in two of the slots (32).

3. The device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor as described in claim 2, characterized in that: The rotating shaft includes a main shaft (2) and a short shaft (25). One end of the main shaft (2) is located inside the gear (31), and the other end is rotatably connected to the outer casing (1). The end of the main shaft (2) is provided with a short shaft (25), and one end of the short shaft (25) extends out of the outer casing (1).

4. The device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor as described in claim 3, characterized in that: The main shaft (2) is provided with four locking blocks (21), each of which is adapted to the locking slot (32).

5. The device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor as described in claim 4, characterized in that: The oil injection hole includes a first circular hole (23) and a second circular hole (24). The first circular hole (23) and the second circular hole (24) are T-shaped. The other end of the first circular hole (23) is connected to the third circular hole (34). One end of the second circular hole (24) is connected to the third circular hole (34), and the other end is flush with the extension end of the short shaft (25).

6. The device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor as described in claim 5, characterized in that: The gear (31) has four limiting grooves (33), and each locking block (21) is provided with a limiting block (22), which is adapted to the limiting groove (33).

7. The device for refrigeration and heating using a megawatt-level supercritical CO2 centrifugal compressor as described in claim 6, characterized in that: The card block (21) is provided with a slope (26) to facilitate the quick engagement of the card block (21) and the card slot (32).

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