Centrifugal separator

Abstract

The centrifugal separator comprises a shell provided with a partition plate, the partition plate divides the shell into a first cavity and a second cavity, the partition plate is provided with a first bearing seat, a first bearing is arranged in the first bearing seat, and the shell is provided with a first outlet; the rotating shaft is arranged in the first bearing in a penetrating manner; the rotor is arranged on the rotating shaft in a sleeving mode, the rotor is located in the first cavity and comprises a first disc set and at least one second disc which are stacked, the second disc is located below the first disc set, a first through hole is formed in the second disc, and the first through hole penetrates through the second disc in the axial direction of the rotating shaft; the oil separation cover is provided with a second through hole, the oil separation cover is arranged on the rotating shaft in a sleeving mode, an oil separation cavity wrapping the first bearing is defined by the oil separation cover and the partition plate, the oil separation cover is provided with an oil return channel, and the oil separation cavity is communicated with the first through hole. According to the centrifugal separator, the oil separation cavity is communicated with the first through hole of the second disc, so that oil in the oil separation cavity can enter the separation cavity again for secondary separation, and a better separation effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of liquid purification, specifically a centrifugal separator. Background Technology

[0002] In existing oil-gas separators, the oil separated during operation flows down the shell wall, collects at the center via the upper surface of the bearing housing, and is discharged into the lower cavity through the gap between the inner and outer rings of the bearing. Due to the high operating speed, the inner ring of the bearing acts like an oil slinger, throwing up and out the collected oil. This causes some oil to be carried away by the airflow, resulting in full contact between the oil and the high-speed rotating gas, which can easily cause secondary pollution. Furthermore, the larger the amount of oil temporarily stored after separation, the greater the probability of secondary pollution caused by being thrown out. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a centrifugal separator. The centrifugal separator has an oil separator cover inside its shell. The oil separator cover, together with the partition plate, forms an oil separator cavity that covers the first bearing. The oil separator cover has an oil return channel for oil to enter the oil separator cavity. The rotor of the centrifugal separator includes a second disc. The second disc has a first through hole. The oil separator cavity communicates with the first through hole, so that the oil in the oil separator cavity can re-enter the separation cavity for secondary separation, thereby achieving a better separation effect and avoiding secondary pollution caused by excessive temporary oil volume being thrown out by the bearing.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a centrifugal separator, comprising:

[0005] The housing has a partition inside, which divides the housing into a first cavity and a second cavity. The partition is provided with a first bearing seat, and the first bearing seat is provided with a first bearing. The housing is provided with a first outlet.

[0006] A rotating shaft, which passes through the first bearing;

[0007] The rotor is sleeved on the rotating shaft and located in the first cavity. The rotor includes a stacked first disc group and at least one second disc. The second disc is located below the first disc group and has a first through hole that penetrates the second disc along the axial direction of the rotating shaft.

[0008] An oil separator is provided, wherein the oil separator is provided with a second through hole, and the oil separator is sleeved on the rotating shaft through the second through hole. The oil separator and the partition plate form an oil separator cavity covering the first bearing. The oil separator is provided with an oil return channel for supplying oil to enter the oil separator cavity, and the oil separator cavity is connected to the first through hole.

[0009] Through the above technical solution, the centrifugal separator is provided with an oil separator cover inside the shell. The oil separator cover, together with the partition plate, forms an oil separator cavity covering the first bearing. The oil separator cover is provided with an oil return channel for oil to enter the oil separator cavity. The rotor of the centrifugal separator includes a second disc. The second disc is provided with a first through hole. The oil separator cavity is connected to the first through hole, so that the oil in the oil separator cavity can re-enter the separation cavity for secondary separation, thereby achieving a better separation effect.

[0010] Furthermore, the oil separator forms the edge of the second through hole and extends along the axial direction of the rotating shaft by a first preset length to form a first side plate, and the oil separator cavity communicates with the first through hole through the first side plate.

[0011] With the above technical solution, in the separator state, the first side plate is as close as possible to the second disc, and the first through hole is covered between the first side plate and the rotating shaft, so as to connect the oil separation chamber with the first through hole.

[0012] Furthermore, the bottom of the second disc is provided with an annular groove, the first through hole is disposed in the groove and is spaced apart along the circumferential direction of the groove, and the first side plate is at least partially located in the groove.

[0013] By using the above technical solution, part of the first side plate is placed in the groove, thereby reducing the possibility of oil flowing out from the gap between the first side plate and the second disc.

[0014] Furthermore, it also includes a sealing element made of an elastic material, which is disposed between the second disc and the oil separator to connect the oil separator cavity with the first through hole;

[0015] The bottom of the second disc is provided with an annular groove, and the first through hole is disposed in the groove and is spaced apart along the circumferential direction of the groove;

[0016] The side of the seal facing the second disc is at least partially located within the groove.

[0017] With the above technical solution, when the centrifugal separator is working, due to the high-speed rotation of the rotor and the shaft, the air pressure in the channel formed between the first side plate and the shaft decreases, causing the seal to be attracted towards the shaft, thereby creating a gap between the seal and the second disc, thus avoiding mutual friction between the seal and the second disc.

[0018] Furthermore, the sealing element has a lip on the side facing the oil separator, and the lip is fitted onto the first side plate.

[0019] With the above technical solution, the sealing element is detachably sleeved on the first side plate through the lip, which facilitates later maintenance and replacement.

[0020] Furthermore, the seal has an inclined surface on the side facing the second disc that slopes from the outside in and from the bottom up, and the inclined surface is at least partially located within the groove.

[0021] Through the above technical solution, the inclined surface makes the side of the seal facing the second disc more flexible and easier to be adsorbed by low pressure, thereby forming a seal.

[0022] Furthermore, the rotor also includes a third disc, which is disposed between the first disc group and the second disc, and a secondary separation cavity is formed between the second disc and the third disc.

[0023] The above technical solution uses a third disc to isolate the first disc group and the second disc, forming a secondary separation cavity only through the second and third discs.

[0024] Furthermore, it also includes an exhaust pipe, which is sealed to the first outlet, and the portion of the exhaust pipe located inside the housing has a gas collecting port. The gas collecting port is used to collect the gas separated by the oil-gas separator.

[0025] Furthermore, the housing includes:

[0026] A first housing, having an inlet and a first outlet, and a second bearing housing inside the first housing, with a second bearing housed therein;

[0027] A second housing is sealed to the first housing, and the second housing is provided with a second outlet for liquid to flow out.

[0028] The partition is disposed between the first housing and the second housing, and the rotating shaft passes through the first bearing and the second bearing.

[0029] Furthermore, the oil separator is provided with a positioning block, which is located between the oil separator and the inner wall of the housing.

[0030] Through the above technical solution, the positioning block can fix the oil separator cover relative to the housing.

[0031] By employing the above technical solutions, the beneficial effects of the present invention are as follows:

[0032] 1. The centrifugal separator disclosed in this application has an oil separator cover inside its housing. The oil separator cover, together with the baffle plate, forms an oil separation chamber that covers the first bearing. The oil separator cover has an oil return channel for oil to enter the oil separation chamber. The rotor of the centrifugal separator includes a second disc. The second disc has a first through hole. The oil separation chamber is connected to the first through hole, so that the oil in the oil separation chamber can re-enter the separation chamber for secondary separation, thereby achieving a better separation effect and avoiding secondary pollution caused by excessive temporary oil being thrown out by the bearing.

[0033] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the shell of the centrifugal separator in an embodiment of the present invention;

[0036] Figure 2 This is a cross-sectional view of the centrifugal separator in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the oil separator in an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the structure of the second disc in an embodiment of the present invention;

[0039] Figure 5 This is a lower view of the seal in an embodiment of the present invention;

[0040] Figure 6 This is a top view of the seal in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the structure of the third disc in an embodiment of the present invention.

[0042] The reference numerals in the above figures are as follows: 11, first housing; 111, first bearing; 112, first outlet; 113, second bearing; 2, partition plate; 31, rotating shaft; 321, second disc; 322, first disc assembly; 323, third disc; 3211, first through hole; 3212, groove; 4, oil separator; 41, first side plate; 42, first plate; 43, second plate; 44, third plate; 45, second through hole; 46, positioning block; 47, oil return hole; 48, second side plate; 5, seal; 51, lip; 52, inclined surface; 6, exhaust pipe; 61, air collection port. Detailed Implementation

[0043] 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.

[0044] It should be noted that in the description of this invention, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] Example: This example discloses a centrifugal separator, comprising:

[0046] The housing has a partition 2 inside, which divides the housing into a first cavity and a second cavity. The partition 2 is provided with a first bearing seat, and a first bearing 111 is provided in the first bearing seat. The housing is provided with a first outlet 112.

[0047] A rotating shaft 31 is inserted into the first bearing 111;

[0048] The rotor is sleeved on the rotating shaft 31 and located in the first cavity. The rotor includes a stacked first disc group 322 and at least one second disc 321. The second disc 321 is located below the first disc group 322. The second disc 321 is provided with a first through hole 3211, which penetrates the second disc 321 along the axial direction of the rotating shaft 31.

[0049] An oil separator 4 is provided with a second through hole 45. The oil separator 4 is sleeved on the rotating shaft 31 through the second through hole 45. The oil separator 4 and the partition plate 2 form an oil separator cavity covering the first bearing. The oil separator 4 is provided with an oil return channel for supplying oil to enter the oil separator cavity. The oil separator cavity is connected to the first through hole 3211.

[0050] The second disc 321 is configured with 1 to 5 discs.

[0051] Through the above technical solution, the centrifugal separator is provided with an oil separator 4 inside the shell. The oil separator 4, together with the partition plate 2, forms an oil-separating cavity that covers the first bearing 111. The oil separator 4 is provided with an oil return channel for oil to enter the oil-separating cavity. The rotor of the centrifugal separator includes a second disc 321. The second disc 321 is provided with a first through hole 3211. The oil-separating cavity is connected to the first through hole 3211, so that the oil in the oil-separating cavity can re-enter the separation cavity for secondary separation, thereby achieving a better separation effect and avoiding secondary pollution caused by excessive temporary oil volume being thrown out by the bearing.

[0052] The separation chamber is the area where the rotor works, and the rotor rotates in the separation chamber to separate oil and gas.

[0053] Combination Figure 1 , 2 As shown, the housing includes:

[0054] A first housing 11 is provided with an inlet 114 and a first outlet 112. A second bearing seat is provided inside the first housing 11, and a second bearing 113 is provided inside the second bearing seat. The inlet 114 is used to receive the oil-gas mixture to be separated.

[0055] The second housing 12 is sealed to the first housing 11, and the second housing 12 is provided with a second outlet for liquid to flow out.

[0056] The first housing 11 and the second housing 12 are connected and fixed by bolts and sealing rings. The partition 2 is disposed between the first housing 11 and the second housing 12. The rotating shaft 31 passes through the first bearing 111 and the second bearing 113. The portion of the rotating shaft 31 that extends out of the first bearing 111 is used to connect to a drive device. Under the drive device, the rotor rotates with the rotating shaft 31, thereby separating oil and gas.

[0057] The centrifugal separator also includes an exhaust pipe 6, which is sealed to the first outlet 112. The portion of the exhaust pipe 6 located inside the housing has a gas collecting port 61. The gas collecting port 61 is used to collect the separated gas.

[0058] The oil separator 4 forms the edge of the second through hole 45 and extends a first preset length along the axial direction of the rotating shaft 31 to form a first side plate 41. The oil separator cavity is connected to the first through hole 3211 through the first side plate 41.

[0059] Through the above technical solution, in the separator state, the first side plate 41 is brought as close as possible to the second disc 321, and the first through hole 3211 is covered between the first side plate 41 and the rotating shaft 31, so as to connect the oil separation chamber with the first through hole 3211.

[0060] In some feasible embodiments, such as Figure 3 As shown, the oil separator 4 includes:

[0061] The first plate 42 is parallel to the partition 2, and the outer edge of the first plate 42 extends toward the partition 2 to form a vertical plate that supports the oil separator 4 on the partition 2.

[0062] The second plate 43 is connected to the first plate 42, and the side of the second plate 43 facing away from the first plate 42 is inclined toward the rotor.

[0063] The third plate 44 is connected to the second plate 43 on the side opposite to the first plate 42. The third plate 44 is parallel to the partition 2. The second through hole 45 is provided on the third plate 44. The third plate 44 forms the edge of the second through hole 45 and extends along the axial direction of the rotating shaft 31 for a first preset length to form the first side plate 41.

[0064] In some feasible embodiments, the oil return channel includes a plurality of oil return holes 47, which are disposed on the surface of the vertical plate that contacts the partition plate 2 and are arranged along the circumferential direction of the vertical plate.

[0065] The oil separator 4 is provided with a positioning block 46, which is located between the oil separator 4 and the inner wall of the housing. The positioning block 46 can fix the oil separator 4 relative to the housing.

[0066] The outer edge of the oil separator 4 extends a second predetermined length toward the side opposite to the partition plate 2, forming a second side plate 48. A gap exists between the second side plate 48 and the inner wall of the housing. The second side plate 48 has a third through hole 481 through which the exhaust pipe 6 passes, and the outer wall surface of the exhaust pipe 6 is sealed to the wall surface forming the third through hole 481. Figure 3 As shown, the second side plate 48 and the vertical plate can be integrally formed.

[0067] like Figure 4As shown, the bottom of the second disc 321 is provided with an annular groove 3212, the first through hole 3211 is disposed in the groove 3212 and is spaced apart along the circumferential direction of the groove 3212, and the first side plate 41 is at least partially located in the groove 3212.

[0068] By using the above technical solution, a portion of the first side plate 41 is placed in the groove 3212, thereby reducing the possibility of oil flowing out from the gap between the first side plate 41 and the second disc 321.

[0069] It should be noted that the rotor separates oil and gas using the principle of a centrifuge. Due to the high-speed rotation of the rotor, the gas pressure in the separation chamber is lower than that in the oil-separating chamber, causing the separation chamber to have an adsorption effect on the oil in the oil-separating chamber. To prevent the oil from being difficult to drain from the gap of the first bearing 111 to the second chamber under the action of pressure difference, in some feasible embodiments, combined with Figure 2 , 7 As shown, the rotor also includes a third disc 323, which is disposed between the first disc group 322 and the second disc 321, and a secondary separation cavity is formed between the second disc 321 and the third disc 323.

[0070] Through the above technical solution, the first disc group 322 and the second disc 321 are isolated by the third disc 323, and a secondary separation chamber for secondary separation is formed only by a small number of the second disc 321 and the third disc 323. The total outlet area of ​​this secondary separation chamber is much smaller than the outlet area of ​​the first disc group 322, so the pressure difference between the secondary separation chamber and the oil separator is smaller, thereby avoiding the pressure difference affecting the discharge of oil from the gap of the first bearing 111 to the second chamber.

[0071] In some feasible embodiments, the centrifugal separator further includes a seal 5 made of an elastic material, which is disposed between the second disc 321 and the oil separator 4 to connect the oil separator chamber with the first through hole 3211.

[0072] Combination Figure 2 , 4 As shown, the bottom of the second disc 321 is provided with an annular groove 3212, and the first through hole 3211 is disposed in the groove 3212 and is spaced apart along the circumferential direction of the groove 3212.

[0073] The side of the seal 5 facing the second disc 321 is at least partially located within the groove 3212.

[0074] Through the above technical solution, during the operation of the centrifugal separator, due to the high-speed rotation of the rotor and shaft 31, the air pressure in the channel formed between the first side plate 41 and the shaft 31 decreases, causing the seal 5 to be attracted towards the shaft 31, thus creating a gap between the seal 5 and the second disc 321, thereby preventing the seal 5 from rubbing against the second disc 321. Simultaneously, due to the low air pressure, the oil is attracted by the air pressure and will not leak from the gap between the seal 5 and the second disc 321.

[0075] In some feasible embodiments, combined with Figure 2 , 5 As shown, the sealing element 5 is annular in shape, and the sealing element 5 has a lip 51 on the side facing the oil separator 4. The lip 51 is fitted onto the first side plate 41.

[0076] Through the above technical solution, the sealing element 5 is detachably sleeved on the first side plate 41 via the lip 51, which facilitates later maintenance and replacement.

[0077] In some feasible embodiments, combined with Figure 2 , 6 As shown, the side of the seal 5 facing the second disc 321 has an inclined surface 52 that extends from the outside in and from the bottom up, and the inclined surface 52 is at least partially located within the groove 3212.

[0078] Through the above technical solution, the inclined surface 52 makes the side of the sealing element 5 facing the second disc 321 more flexible and easier to be adsorbed by low pressure, thereby forming a seal.

[0079] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A centrifugal separator, characterized in that The utility model relates to a centrifugal separator, comprising: a housing, a partition plate is arranged in the housing, the partition plate divides the housing into a first cavity and a second cavity, the partition plate is provided with a first bearing seat, a first bearing is arranged in the first bearing seat, and the housing is provided with a first outlet; a rotating shaft, the rotating shaft is arranged in the first bearing; a rotor, the rotor is sleeved on the rotating shaft and located in the first cavity, the rotor comprises a first disc group and at least one second disc, the second disc is located below the first disc group, the second disc is provided with a first through hole, and the first through hole penetrates the second disc along the axial direction of the rotating shaft; an oil separation cover, the oil separation cover is provided with a second through hole, the oil separation cover is sleeved on the rotating shaft through the second through hole, the oil separation cover and the partition plate surround an oil separation cavity covering the first bearing, the oil separation cover is provided with an oil return channel for oil entering the oil separation cavity, and the oil separation cavity is communicated with the first through hole.

2. The centrifugal separator according to claim 1, characterized in that The oil separation cover forms the edge of the second through hole, extends a first preset length along the axial direction of the rotating shaft, forms a first side plate, and the oil separation cavity is communicated with the first through hole through the first side plate.

3. The centrifugal separator according to claim 2, characterized in that The bottom of the second disc is provided with an annular groove, the first through hole is arranged in the groove and is arranged at intervals along the circumferential direction of the groove, and the first side plate is at least partially located in the groove.

4. The centrifugal separator according to claim 2, characterized in that Further comprising a sealing element made of a material with elasticity, the sealing element is arranged between the second disc and the oil separation cover for connecting the oil separation cavity with the first through hole; The bottom of the second disc is provided with an annular groove, the first through hole is arranged in the groove and is arranged at intervals along the circumferential direction of the groove; Wherein, the side of the sealing element towards the second disc is at least partially located in the groove.

5. The centrifugal separator according to claim 4, characterized in that The side of the sealing element towards the oil separation cover is provided with a lip, and the lip is sleeved on the first side plate.

6. A centrifugal separator according to claim 5, characterised in that The side of the sealing element towards the second disc is a slope from outside to inside and from bottom to top, and the slope is at least partially located in the groove.

7. The centrifugal separator as claimed in claim 1, characterized in that The rotor further comprises a third disc, the third disc is arranged between the first disc group and the second disc, and a secondary separation cavity is formed between the second disc and the third disc.

8. The centrifugal separator as claimed in claim 1, characterized in that Further comprising an exhaust pipe, the exhaust pipe is sealingly connected with the first outlet, and the part of the exhaust pipe located in the housing is provided with a gas collecting port.

9. The centrifugal separator as claimed in claim 1, characterized in that The housing comprises: a first housing, the first housing is provided with an inlet and the first outlet, a second bearing seat is arranged in the first housing, and a second bearing is arranged in the second bearing seat; a second housing, the second housing is sealingly connected with the first housing, and the second housing is provided with a second outlet for liquid outflow; Wherein, the partition plate is arranged between the first housing and the second housing, and the rotating shaft is arranged in the first bearing and the second bearing.

10. The centrifugal separator as claimed in claim 1, characterized in that The oil separation cover is provided with a positioning block, and the positioning block is located between the oil separation cover and the inner side wall of the housing.

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