Centrifugal compressor coupling guard

Abstract

The application discloses a centrifugal compressor coupling protective cover and relates to the technical field of centrifugal compressors.The centrifugal compressor coupling protective cover comprises a coupling, a first protective shell and a second protective shell arranged at the bottom and the top of the coupling, and the first protective shell and the second protective shell are fixedly connected through a bolt assembly.The contact position of the first protective shell and the second protective shell is sealed through sealing rubber.A suction jet auxiliary device is arranged between the first protective shell and the second protective shell.The suction jet auxiliary device can form an air wall at the contact position of the first protective shell and the second protective shell during the rotation of the coupling, so as to block the dust from the outside, avoid the dust from adhering to the surface of the coupling or penetrating into the connecting gap, and thus protect the normal operation of the coupling and reduce the risk of wear, jam and other faults caused by the dust.

Description

Technical Field

[0001] This invention relates to the field of centrifugal compressor technology, specifically a protective cover for a centrifugal compressor coupling. Background Technology

[0002] Centrifugal compressors are key equipment for transmitting power and ensuring fluid transport in the industrial field. Their couplings are the core components for realizing power transmission. However, under the current technology, the operation of couplings faces multiple technical challenges, which seriously restrict the stability and service life of the equipment. Therefore, special protective devices are needed to protect them.

[0003] Existing coupling protective covers typically use a shell to directly cover the coupling for protection, but this approach has several shortcomings in practical applications. Firstly, while sealing the contact area between the protective cover and the coupling with a sealing structure can prevent external dust intrusion to some extent, it also makes it difficult for internal heat to dissipate, thus accelerating coupling aging. Secondly, if gaps are left at the contact area to ensure heat dissipation, external dust can easily enter the protective cover through these gaps, adversely affecting coupling operation. Thirdly, since couplings require regular lubrication during long-term use, existing protective cover structures require operators to stop the machine and disassemble the cover to manually add lubricant. This not only increases labor intensity and time consumption but also affects production efficiency due to downtime. Furthermore, the disassembly and assembly process easily introduces dust, further contaminating the coupling's working environment. Therefore, we provide a centrifugal compressor coupling protective cover to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to provide a centrifugal compressor coupling protective cover to solve the problems of heat accumulation and dust entry through the gap between the protective cover and the coupling during use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a centrifugal compressor coupling protective cover, comprising: a coupling and a first protective shell and a second protective shell disposed at the bottom and top of the coupling, wherein the first protective shell and the second protective shell are fixedly connected by a bolt assembly, and the contact portion of the first protective shell and the second protective shell is sealed by sealing rubber; a suction jet auxiliary device, located between the first protective shell and the second protective shell, the suction jet auxiliary device comprising: a first air guide cylinder fixedly connected to the inner side of the first protective shell and the second protective shell, wherein two first air guide cylinders form a ring disposed on the outer side of the coupling; a jet groove formed on the inner side of the first air guide cylinder, and the jet groove is inclined and aligned with the outer side of the coupling; a gradual filling mechanism, located at the top of the second protective shell and extending to the inner side of the second protective shell, for filling the connection portion of the coupling with lubricating oil.

[0006] As a further embodiment of the present invention: the suction jet auxiliary device further includes a suction chamber fixedly connected to the inner sides of the first protective shell and the second protective shell respectively. A first piston plate is slidably connected to the inner side of the suction chamber, and a first auxiliary spring is installed between the first piston plate and the suction chamber. A second one-way valve is installed at the air outlet of the suction chamber, and the second one-way valve is connected to the first air guide cylinder through the connecting pipe. A suction pipe is fixedly connected to the air inlet of the suction chamber, and a first one-way valve is installed at the air outlet of the suction pipe. A power pushing component is provided at the bottom of the first piston plate.

[0007] As a further embodiment of the present invention: the power drive assembly includes a power ring fixedly connected to the outer wall of the coupling, the outer wall of the power ring is provided with a plurality of arched surfaces, a rectangular rod is fixedly connected to the bottom of the first piston plate, a roller is rotatably connected to the bottom of the rectangular rod, and the roller abuts against the outer wall of the power ring.

[0008] As a further embodiment of the present invention: the roller located inside the second protective shell initially abuts against the outer wall of the power ring, and the roller located inside the first protective shell initially abuts against the outer wall of the arched surface.

[0009] As a further embodiment of the present invention: the step-by-step filling mechanism includes a lubricating oil tank fixedly connected to the outer wall of the second protective shell, a fixed shell fixedly connected to the inner side of the lubricating oil tank, and one end of the fixed shell extending to the outside of the lubricating oil tank. A filling pipe is fixedly connected to the outlet of the fixed shell, and one end of the filling pipe extends to the inner side of the second protective shell and is located at the coupling connection part. A through hole communicating with the outside is opened on the inner side of the fixed shell.

[0010] As a further embodiment of the present invention: the progressive filling mechanism includes a first piston block and a second piston block slidably connected to the inner side of the fixed shell. The first piston block and the second piston block are fixedly connected by a connecting column. A connecting spring is installed between the fixed shell and the second piston block. The first piston block and the second piston block are initially located on both sides of the through hole. A power storage auxiliary component for progressively pushing the first piston block to move is provided between the second protective shell and the fixed shell.

[0011] As a further embodiment of the present invention: the power storage auxiliary component includes a second air guide cylinder fixedly connected to the top of the second protective shell, a fourth one-way valve fixedly connected to the air inlet of the second air guide cylinder, a third one-way valve fixedly connected to the air outlet of the second air guide cylinder, and the third one-way valve communicating with the fixed shell, and an electromagnetic valve communicating with the interior is installed at the end of the fixed shell.

[0012] As a further embodiment of the present invention: the power storage auxiliary component further includes a second piston plate slidably connected to the inner side of the second air guide cylinder, a second auxiliary spring is installed between the second piston plate and the second air guide cylinder, a guide post is fixedly connected to the bottom of the second piston plate, and one end of the guide post extends through to the inner side of the suction chamber and is slidably connected to the suction chamber.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. By setting up a suction jet auxiliary device, when the coupling is running, the coupling rotates and drives the power ring to rotate. When the roller moves from the lowest point to the highest point along the arched surface, it pushes the rectangular rod to drive the first piston plate to move upward, thereby pushing the gas inside the suction chamber into the first air guide cylinder through the second one-way valve, and blowing it towards the coupling through the jet groove. Since the roller located inside the second protective shell initially abuts against the outer wall of the power ring, and the roller located inside the first protective shell initially abuts against the outer wall of the arched surface, the jet groove can intermittently blow air towards the connection part between the coupling and the first and second protective shells. This allows the coupling to form an air wall at the contact part with the first and second protective shells during rotation, thereby blocking external dust from entering and preventing dust from adhering to the surface of the coupling or seeping into the connection gap, thus protecting the normal operation of the coupling and reducing the risk of failures such as wear and jamming caused by dust.

[0015] 2. By setting up the cooperation of parts such as rollers, when the rollers move from the highest point to the lowest point along the arched surface, under the action of the piston spring, the hot gas in the enclosed space of the first and second protective shells can be drawn into the suction chamber through the first one-way valve and blown into the gap between the coupling 3 and the first protective shell 1 and the second protective shell 2 to be discharged to the outside. This reduces the heat generated during the operation of the coupling, forming a "heat absorption-heat discharge" cycle, continuously reducing the temperature inside the protective cover, avoiding performance degradation and accelerated component aging caused by long-term high-temperature operation of the coupling, and extending the service life of the coupling.

[0016] 3. By setting up a step-by-step lubrication mechanism, lubricating oil can be automatically and intermittently replenished to the coupling connection parts without the need for manual operation by the staff, thereby improving the overall practicality of the device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0019] Figure 3 This is another structural schematic diagram of the present invention;

[0020] Figure 4 This is a cross-sectional view of the first and second protective shells of the present invention;

[0021] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 This is a schematic diagram of the suction jet auxiliary device of the present invention;

[0023] Figure 7 This is a partial structural diagram of one side of the lubricating oil tank of the present invention;

[0024] Figure 8 For the present invention Figure 7 Enlarged view at point B in the middle;

[0025] Figure 9 This is a schematic diagram of the step-by-step filling mechanism of the present invention;

[0026] Figure 10 This is a schematic diagram of the dynamic ring structure of the present invention.

[0027] In the diagram: 1. First protective shell; 2. Second protective shell; 3. Coupling; 4. Lubricating oil tank; 5. Power ring; 6. Filling pipe; 7. Fixed shell; 8. Connecting spring; 9. First piston block; 10. Second piston block; 11. Connecting column; 12. First air guide cylinder; 13. Air jet groove; 14. Connecting pipe; 15. Suction chamber; 16. First piston plate; 17. First auxiliary spring; 18. Second auxiliary spring; 19. Suction pipe; 20. Rectangular rod; 21. Roller; 22. Piston spring; 23. First one-way valve; 24. Second one-way valve; 25. Guide column; 26. Second piston plate; 27. Through hole; 28. Solenoid valve; 29. ​​Third one-way valve; 30. Fourth one-way valve; 31. Arched surface; 32. Second air guide cylinder. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0030] Example 1

[0031] Please see Figures 1-10This embodiment provides a protective cover for a centrifugal compressor coupling, including: a coupling 3 and a first protective shell 1 and a second protective shell 2 disposed at the bottom and top of the coupling 3, respectively, and the first protective shell 1 and the second protective shell 2 are fixedly connected by a bolt assembly, and the contact parts of the first protective shell 1 and the second protective shell 2 are sealed by sealing rubber; a suction jet auxiliary device is located between the first protective shell 1 and the second protective shell 2, and the suction jet auxiliary device includes: a first air guide cylinder 12 fixedly connected to the inner side of the first protective shell 1 and the second protective shell 2, and the two first air guide cylinders 12 form a ring disposed on the outer side of the coupling 3; a jet groove 13 opened on the inner side of the first air guide cylinder 12, and the jet groove 13 is inclined and aligned with the outer side of the coupling 3; the suction jet auxiliary device also includes a suction chamber 15 fixedly connected to the inner side of the first protective shell 1 and the second protective shell 2 respectively, and a first piston plate is slidably connected to the inner side of the suction chamber 15. 16, and a first auxiliary spring 17 is installed between the first piston plate 16 and the suction chamber 15. A second one-way valve 24 is installed at the air outlet of the suction chamber 15, and the second one-way valve 24 is connected to the first air guide cylinder 12 through the connecting pipe 14. A suction pipe 19 is fixedly connected at the air inlet of the suction chamber 15, and a first one-way valve 23 is installed at the air outlet of the suction pipe 19. A power push assembly is provided at the bottom of the first piston plate 16. The power push assembly includes a power ring 5 fixedly connected to the outer wall of the coupling 3. A plurality of arched surfaces 31 are arranged around the outer wall of the power ring 5. A rectangular rod 20 is fixedly connected to the bottom of the first piston plate 16. A roller 21 is rotatably connected to the bottom of the rectangular rod 20, and the roller 21 abuts against the outer wall of the power ring 5. The roller 21 located inside the second protective shell 2 initially abuts against the outer wall of the power ring 5, and the roller 21 located inside the first protective shell 1 initially abuts against the outer wall of the arched surface 31.

[0032] A filter screen communicating with the interior can be installed on the top of the second protective shell 2, allowing outside air to enter. Firstly, when the coupling 3 is running, its rotation drives the power ring 5 to rotate. When the roller 21 moves from the lowest point to the highest point along the arched surface 31, it pushes the rectangular rod 20, causing the first piston plate 16 to move upwards. This forces the gas inside the suction chamber 15 into the first air guide cylinder 12 through the second one-way valve 24, and blown through the jet groove 13 into the gap between the coupling 3 and the first and second protective shells 1 and 2. Because the roller 21 located inside the second protective shell 2 initially... The roller 21, located inside the first protective shell 1, initially abuts against the outer wall of the power ring 5 and the outer wall of the arched surface 31. This allows the power ring 5 to drive the roller 21, which is set up one above the other, to perform alternating reciprocating motion during its circumferential rotation. This ensures that gas is always ejected from the inner side of the jet groove 13. As a result, the coupling 3 can form an air wall at the contact point with the first protective shell 1 and the second protective shell 2 during its rotation. This prevents external dust from entering and avoids dust adhering to the surface of the coupling 3 or seeping into the connection gap. This protects the normal operation of the coupling and reduces the risk of failures such as wear and jamming caused by dust.

[0033] Simultaneously, as the roller 21 moves from the highest point to the lowest point along the arched surface 31, under the reset action of the piston spring 22, the hot gas in the enclosed space of the first protective shell 1 and the second protective shell 2 can be sucked into the suction chamber 15 through the suction pipe 19 and the first one-way valve 23. During the upward movement of the first piston plate 16, it can be blown into the gap between the coupling 3 and the first protective shell 1 and the second protective shell 2 through the cooperation of the second one-way valve 24, the jet groove 13 and other parts, so as to be discharged to the outside. This reduces the heat generated during the operation of the coupling 3, forming a "heat absorption-heat discharge" cycle, continuously reducing the temperature inside the protective cover, avoiding performance degradation and accelerated component aging caused by long-term high-temperature operation of the coupling 3, and extending the service life of the coupling.

[0034] Example 2

[0035] Based on the solution of Example 1, Example 2 further includes the following technical improvements:

[0036] Please see Figures 2 to 10A progressive filling mechanism, located at the top of the second protective shell 2 and extending into the inner side of the second protective shell 2, is used to fill the connection part of the coupling 3 with lubricating oil. The progressive filling mechanism includes a lubricating oil tank 4 fixedly connected to the outer wall of the second protective shell 2. A fixed shell 7 is fixedly connected to the inner side of the lubricating oil tank 4, and one end of the fixed shell 7 extends to the outside of the lubricating oil tank 4. A filling pipe 6 is fixedly connected to the outlet of the fixed shell 7, and one end of the filling pipe 6 extends into the inner side of the second protective shell 2 and is located at the connection part of the coupling 3. A through hole 27 communicating with the outside is opened on the inner side of the fixed shell 7. The progressive filling mechanism includes a first piston block 9 and a second piston block 10 slidably connected to the inner side of the fixed shell 7. The first piston block 9 and the second piston block 10 are fixedly connected by a connecting column 11. A connecting spring 8 is installed between the fixed shell 7 and the second piston block 10. Block 10 is initially located on both sides of the through hole 27. A power storage auxiliary component is provided between the second protective shell 2 and the fixed shell 7 to gradually push the first piston block 9 to move. The power storage auxiliary component includes a second air guide cylinder 32 fixedly connected to the top of the second protective shell 2. A fourth one-way valve 30 is fixedly connected to the air inlet of the second air guide cylinder 32. A third one-way valve 29 is fixedly connected to the air outlet of the second air guide cylinder 32 and communicates with the fixed shell 7. A solenoid valve 28 communicating with the interior is installed at the end of the fixed shell 7. The power storage auxiliary component also includes a second piston plate 26 slidably connected to the inside of the second air guide cylinder 32. A second auxiliary spring 18 is installed between the second piston plate 26 and the second air guide cylinder 32. A guide post 25 is fixedly connected to the bottom of the second piston plate 26 and one end of the guide post 25 penetrates to the inside of the suction chamber 15 and is slidably connected to the suction chamber 15.

[0037] A filter element for filtration can be installed at the air inlet of the fourth one-way valve 30. When the first piston plate 16 moves upward and contacts the guide post 25, it pushes the second piston plate 26 upward a certain distance, thereby pushing the gas inside the second air guide cylinder 32 into the fixed shell 7 through the third one-way valve 29. This pushes the first piston block 9 and the second piston block 10 to move laterally. When the first piston plate 16 separates from the guide post 25 during the reset process, the guide post 25 resets under the action of the second auxiliary spring 18. The fourth one-way valve 30 draws outside air into the second air guide cylinder 32, and a certain amount of gas is intermittently pushed into the fixed shell 7, thereby gradually pushing the lubricating oil between the first piston block 9 and the second piston block 10 into the filling pipe 6. Internally, when the lubricating oil between the second piston block 10 and the first piston block 9 moves to the oil inlet position of the filling pipe 6, it can be sprayed onto the connection part of the coupling 3 through the filling pipe 6 for lubrication. At this time, the first piston plate 16 has not been reset and is still being pushed, so the lubricating oil can be sprayed out for a certain period of time. When the first piston plate 16 is reset during this process, the solenoid valve 28 is automatically opened under the control of the PLC controller, so that the first piston block 9 is reset under the action of the connecting spring 8. This allows the first piston block 9 and the second piston block 10 to be located on both sides of the through hole 27 after reset, so that the through hole 27 can be automatically replenished with lubricating oil without the need for manual operation by the operator, thereby improving the overall practicality of the device.

[0038] To determine how many rotations of coupling 3 are needed to complete one lubrication operation during the implementation of the above structure, refer to the following formula and steps:

[0039] The power chain of the filling mechanism is as follows: the coupling 3 rotates → the power ring 5 rotates synchronously → the arched surface 31 of the power ring 5 pushes the roller 21 → the first piston plate 16 moves up and down (1 reciprocation = 1 upward movement + 1 downward movement) → the gas pressure is accumulated through multiple reciprocations → the first piston block 9 and the second piston block 10 are pushed to complete 1 filling.

[0040] Table 1. Explanation of Key Motion Parameters of Couplings

[0041] Parameter symbol Parameter name Physical meaning Determination method Z Total number of dynamic ring arch surfaces The number of evenly distributed arched surfaces on the outer wall of the dynamic ring (e.g., 6 or 8). Determined by the equipment design (requires matching the coupling diameter, roller stroke, and effective piston plate stroke). k The total number of reciprocating strokes of the first piston plate required for a single lubricant filling. To complete one lubricant filling, the first piston plate needs to reciprocate a total of [number] times (accumulating enough gas pressure to push the piston block to deliver oil). Calculated from gas volume, piston area, and single lubricant injection volume (see "Supplementary Calculation of k-value" below). C Number of rotations of the coupling (target calculated value) How many rotations of the coupling are required to trigger one lubrication oil filling? Formula calculation results

[0042] Based on motion correlation:

[0043] The coupling rotates 1 revolution → the power ring rotates 1 revolution → the first piston plate reciprocates Z times (1 arched surface = 1 reciprocation).

[0044] The coupling rotates C revolutions → the first piston plate reciprocates Z×C times;

[0045] When the total number of reciprocating strokes of the first piston plate reaches "k strokes required for a single lubrication," one lubrication stroke is completed, i.e., Z × C = k. The definitions of the key parameters Z, C, and k are shown in Table 1. The formula for the number of rotations required for a single lubrication stroke of the coupling is derived as follows:

[0046]

[0047] Calculation and explanation of key parameters: In the formula, Z (number of arched surfaces) is a fixed value in the equipment design, while k (total number of piston reciprocations required for a single filling) needs to be calculated in conjunction with specific structural parameters and is the core of the formula application. The specific calculation logic is as follows:

[0048] 1. The calculation logic for the value of k;

[0049] The essence of the k-value is: the number of reciprocating motions required for the first piston plate to inject the "total amount of gas" into the fixed housing through "reciprocating motion" to complete one oil push by the piston block. This calculation requires three design parameters:

[0050] set up:

[0051] V1: The "effective gas volume" injected into the air cylinder when the first piston plate moves upward once (= piston plate area × single upward stroke, gas leakage needs to be deducted);

[0052] V 总 The total gas volume required to move the "first piston block + second piston block" inside the fixed housing to the "lubricating oil enters the filling pipe" (= distance the piston block moves inside the fixed housing × cross-sectional area of ​​the piston block);

[0053] The total number of reciprocating strokes of the first piston plate required for a single injection is:

[0054]

[0055] 2. Actual correction for the value of k (engineering errors need to be considered)

[0056] In practical applications, there may be minor gas leaks (such as in the one-way valve sealing gap or the inner wall gap of the air guide tube). Therefore, the theoretical k value needs to be corrected to ensure sufficient pressure to drive the oil pusher.

[0057]

[0058] Wherein, δ is the gas leakage compensation coefficient (usually taken as 0.1~0.2, determined by the sealing performance; the better the sealing, the smaller δ).

[0059] The following are examples of formula applications (for ease of understanding).

[0060] Suppose the design parameters of a certain device are as follows:

[0061] The total number of arched surfaces of the dynamic ring is Z=6 (6 evenly distributed arched surfaces).

[0062] The effective gas injection volume of the first piston plate in a single cycle is V1 = 5 cm³. 3 ;

[0063] The total gas volume required for the fixed shell to push the oil is V_total = 60 cm³. 3 ;

[0064] Leakage compensation coefficient δ=0.1;

[0065] Calculation process:

[0066] Calculate the theoretical value of k: Second-rate

[0067] Calculate the actual value of k: Take the integer 14 (the number of reciprocations must be an integer to ensure sufficient pressure).

[0068] Calculate the number of rotations of the coupling: In engineering practice, 2 to 3 revolutions are used (this needs to be combined with PLC control accuracy calibration, and usually an integer number of revolutions are used).

[0069] In the specific implementation process: the C value calculated by the formula needs to match the "counting logic" of the PLC - the PLC needs to count the number of rotations of the coupling in real time (the speed can be collected by the encoder). When the number of rotations reaches C, the solenoid valve is triggered to reset and replenish oil to ensure the accuracy of the filling cycle.

[0070] If the amount of lubricating oil needs to be adjusted (e.g., to increase the amount of oil due to increased wear), the value of C can be indirectly adjusted by modifying the value of k (e.g., increasing the total value of V), without having to modify the mechanical structure.

[0071] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A centrifugal compressor coupling guard characterized by, The utility model relates to a kind of coupling (3) and the first protective shell (1) and second protective shell (2) are arranged in the bottom and top of the coupling (3), and the first protective shell (1) and the second protective shell (2) are fixedly connected by bolt assembly between the first protective shell (1) and the second protective shell (2), the first protective shell (1) and the second protective shell (2) contact part is sealed by sealing rubber; Suction jet auxiliary device is located between the first protective shell (1) and the second protective shell (2), and the suction jet auxiliary device comprises: First air guide cylinder (12) is fixedly connected in the inside of the first protective shell (1) and the second protective shell (2), and two first air guide cylinders (12) are arranged as a circular ring outside the coupling (3); Jet groove (13) is opened in the inside of the first air guide cylinder (12), and the jet groove (13) is inclined to the outside of the coupling (3); The suction jet auxiliary device further comprises suction bin (15) fixedly connected in the inside of the first protective shell (1) and the second protective shell (2) respectively, the inside of the suction bin (15) is slidably connected with first piston plate (16), and first auxiliary spring (17) is installed between the first piston plate (16) and the suction bin (15); Step-by-step filling mechanism is provided in the top of the second protective shell (2) and penetrates to the inside of the second protective shell (2), for filling lubricating oil to the connecting part of the coupling (3), the step-by-step filling mechanism comprises lubricating oil tank (4) fixedly connected to the outer wall of the second protective shell (2), the inside of the lubricating oil tank (4) is fixedly connected with fixed shell (7), one end of the fixed shell (7) penetrates to the outside of the lubricating oil tank (4), filling pipe (6) is fixedly connected to the liquid outlet of the fixed shell (7), one end of the filling pipe (6) penetrates to the inside of the second protective shell (2) and is located in the connecting part of the coupling (3), and through hole (27) is opened in the inside of the fixed shell (7) and communicated with the outside world; The step-by-step filling mechanism comprises first piston block (9) and second piston block (10) slidably connected in the inside of the fixed shell (7), the first piston block (9) and the second piston block (10) are fixedly connected by connecting column (11), connecting spring (8) is installed between the fixed shell (7) and the second piston block (10), and the first piston block (9) and the second piston block (10) are initially located on both sides of the through hole (27), and force storage auxiliary assembly is arranged between the second protective shell (2) and the fixed shell (7) for gradually pushing the first piston block (9) to move. ​ The power storage auxiliary assembly comprises a second air guide cylinder (32) fixedly connected to the top of the second protective shell (2), a fourth one-way valve (30) fixedly connected to the air inlet of the second air guide cylinder (32), a third one-way valve (29) fixedly connected to the air outlet of the second air guide cylinder (32), and the third one-way valve (29) is communicated with the fixed shell (7), and an electromagnetic valve (28) communicated with the inside is mounted at the end of the fixed shell (7); The power storage auxiliary assembly further comprises a second piston plate (26) slidingly connected to the inner side of the second air guide cylinder (32), a second auxiliary spring (18) mounted between the second piston plate (26) and the second air guide cylinder (32), a guide column (25) fixedly connected to the bottom of the second piston plate (26), and one end of the guide column (25) penetrates to the inner side of the suction chamber (15) and is slidingly connected with the suction chamber (15).

2. A centrifugal compressor coupling guard according to claim 1, wherein, A second one-way valve (24) is mounted at the air outlet of the suction chamber (15), the second one-way valve (24) is communicated with the first air guide cylinder (12) through a connecting pipe (14), a suction pipe (19) is fixedly connected to the air inlet of the suction chamber (15), a first one-way valve (23) is mounted at the air outlet of the suction pipe (19), and a power pushing assembly is arranged at the bottom of the first piston plate (16).

3. A centrifugal compressor coupling guard according to claim 2, wherein, The power pushing assembly comprises a power ring (5) fixedly connected to the outer wall of the shaft coupling (3), a plurality of arc surfaces (31) are arranged on the outer wall of the power ring (5), a rectangular rod (20) is fixedly connected to the bottom of the first piston plate (16), a roller (21) is rotatably connected to the bottom of the rectangular rod (20), and the roller (21) abuts against the outer wall of the power ring (5).

4. A centrifugal compressor coupling guard according to claim 3, wherein, The roller (21) located on the inner side of the second protective shell (2) initially abuts against the outer wall of the power ring (5), and the roller (21) located on the inner side of the first protective shell (1) initially abuts against the outer wall of the arc surface (31).

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