Oil injection flange and screw compressor

Abstract

The utility model relates to the technical field of compressors, in particular to an oil injection flange and a screw compressor. The oil injection flange comprises a flange body used for being connected with a shell of the screw compressor, the flange body is provided with a first oil injection hole set and a second oil injection hole set, the first oil injection hole set comprises at least one first oil injection hole, and the second oil injection hole set comprises at least one second oil injection hole; the first oil injection hole and the second oil injection hole are both communicated with the inlet end of a middle channel of the screw compressor, the first oil injection hole set is used for injecting oil into the area, corresponding to a female rotor of the screw compressor, of the middle channel, and the second oil injection hole set is used for injecting oil into the area, corresponding to a male rotor of the screw compressor, of the middle channel; the oil inlet amount of the first oil injection hole set is larger than that of the second oil injection hole set, the cooling effect of the working fluid on the female rotor side is enhanced, and then the cooling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to an oil injection flange and a screw compressor. Background Art

[0002] Screw compressors primarily include oil-injected screw compressors and oil-free screw compressors. Two-stage oil-injected screw compressors often employ an upper-lower structural arrangement, primarily consisting of a casing, a set of low-pressure compression rotors, and a set of high-pressure compression rotors. The working fluid is drawn in through the casing's air inlet and enters the low-pressure stage rotor cavity for compression. It then enters the intermediate channel, where the oil-injection component sprays oil into the channel to cool the compressed medium. The cooled working fluid then enters the high-pressure stage rotor cavity for compression before being discharged from the casing's exhaust port. Because the male rotor in the low-pressure compression rotor rotates at a higher speed, the heated medium after compression is discharged tangentially to the female rotor, resulting in a higher temperature on the female rotor side.

[0003] In the related art, the oil injection component is evenly provided with multiple oil injection holes to evenly spray oil into the middle channel, resulting in an insignificant cooling effect of the working fluid on the mother rotor side, and thus resulting in low cooling efficiency. Utility Model Content

[0004] The purpose of the utility model is to provide an oil injection flange and a screw compressor to improve the cooling efficiency.

[0005] Based on the above-mentioned purpose, the utility model provides an oil filling flange, including a flange body for connecting to the casing of a screw compressor, the flange body being provided with a first oil filling hole group and a second oil filling hole group, the first oil filling hole group including at least one first oil filling hole, and the second oil filling hole group including at least one second oil filling hole; the first oil filling hole and the second oil filling hole are both connected to the inlet end of the intermediate channel of the screw compressor, the first oil filling hole group is used to fill oil into the area of the intermediate channel corresponding to the female rotor of the screw compressor, and the second oil filling hole group is used to fill oil into the area of the intermediate channel corresponding to the male rotor of the screw compressor, and the oil inlet amount of the first oil filling hole group is greater than the oil inlet amount of the second oil filling hole group.

[0006] According to one embodiment of the present invention, the minimum distance between the first oil filling hole in the first oil filling hole group and the bottom surface of the intermediate channel is a first distance, the minimum distance between the second oil filling hole in the second oil filling hole group and the bottom surface of the intermediate channel is a second distance, the first distance is equal to the second distance, and the first distance and the second distance are both no greater than 50% of the height of the intermediate channel.

[0007] According to one embodiment of the present invention, there are multiple first oil hole groups, and the multiple first oil hole groups are spaced apart along the height direction of the intermediate channel; among the multiple first oil hole groups, there are multiple first oil holes in the first oil hole group away from the mother rotor, and the distances between the multiple first oil holes and the bottom surface of the intermediate channel are all the first distances.

[0008] According to one embodiment of the present invention, the first distance is 20% to 30% of the height of the middle channel.

[0009] According to one embodiment of the present invention, the sum of the number of the first oil holes in the bottom first oil hole group and the number of the second oil holes in the second oil hole group is greater than the number of the first oil holes in any other first oil hole groups.

[0010] According to one embodiment of the present invention, among the plurality of first oil filling hole groups, at least some of the first oil filling hole groups have the same number of the first oil filling holes;

[0011] Alternatively, the numbers of the first oil filling holes in the plurality of first oil filling hole groups are different.

[0012] According to one embodiment of the present invention, there are multiple second oil injection hole groups, and the multiple second oil injection hole groups are spaced apart along the height direction of the middle channel.

[0013] According to one embodiment of the present invention, along the height direction of the middle channel, the sum of the number of first oil holes in the first oil hole group located at the bottom and the second oil holes in the second oil hole group located at the bottom is greater than the sum of the number of first oil holes and second oil holes at any other position.

[0014] According to one embodiment of the present invention, the total number of the first oil injection holes is greater than the total number of the second oil injection holes.

[0015] According to one embodiment of the present invention, the opening area of the first oil injection hole group is larger than the opening area of the second oil injection hole group.

[0016] According to one embodiment of the present invention, the first oil filling hole and the second oil filling hole are both circular in shape, and the diameter of the first oil filling hole is larger than the diameter of the second oil filling hole.

[0017] According to one embodiment of the present invention, there are multiple first oil injection holes, and there are multiple second oil injection holes. The multiple first oil injection holes and the multiple second oil injection holes are spaced apart along the length direction of the flange body, and the distance between two adjacent first oil injection holes is smaller than the distance between two adjacent second oil injection holes.

[0018] According to an embodiment of the present invention, the depth direction of the first oil filling hole and the depth direction of the second oil filling hole are both consistent with the extension direction of the middle channel.

[0019] According to one embodiment of the present invention, the first oil filling hole has a first depth direction, and the second oil filling hole has a second depth direction;

[0020] Along the first depth direction, the first oil filling hole has a first oil inlet end and a first oil outlet end; along the height direction of the intermediate channel, the position of the first oil inlet end is higher than the position of the first oil outlet end;

[0021] And / or, along the second depth direction, the second oil filling hole has a second oil inlet end and a second oil outlet end; along the height direction of the intermediate channel, the position of the second oil inlet end is higher than the position of the second oil outlet end.

[0022] According to one embodiment of the present invention, the first depth direction is consistent with the second depth direction.

[0023] According to one embodiment of the present invention, the oil injection range of the oil injection flange is within the range from the bottom surface of the intermediate channel to the middle position of the intermediate channel.

[0024] Based on the above purpose, the utility model also provides a screw compressor, including the oil injection flange.

[0025] The beneficial effects of the present invention are mainly:

[0026] The oil filling flange provided by the utility model, when in use, installs the flange body on the casing of the screw compressor, so that the first oil filling hole in the first oil filling hole group and the second oil filling hole in the second oil filling hole group are both connected to the inlet end of the intermediate channel of the screw compressor, the first oil filling hole group is used to fill oil into the area of the intermediate channel corresponding to the female rotor of the screw compressor to cool the working fluid on the female rotor side, and the second oil filling hole group is used to fill oil into the area of the intermediate channel corresponding to the male rotor of the screw compressor to cool the working fluid on the male rotor side. Since the oil inlet amount of the first oil filling hole group is greater than the oil inlet amount of the second oil filling hole group, the cooling effect of the working fluid on the female rotor side is enhanced, thereby improving the cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A front view of a screw compressor provided by an embodiment of the present utility model;

[0029] Figure 2 for Figure 1 A cross-sectional view along line AA;

[0030] Figure 3 A right side view of a screw compressor provided by an embodiment of the present utility model;

[0031] Figure 4 for Figure 3 A cross-sectional view along line BB;

[0032] Figure 5 A schematic diagram of the oil filling flange and the intermediate channel provided in an embodiment of the present utility model;

[0033] Figure 6 Another schematic diagram of the oil filling flange and the intermediate channel provided in an embodiment of the present utility model;

[0034] Figure 7 A schematic structural diagram of an oil filling flange provided in an embodiment of the present utility model;

[0035] Figure 8 Another structural schematic diagram of the oil filling flange provided in an embodiment of the utility model;

[0036] Figure 9 A third structural schematic diagram of the oil filling flange provided in an embodiment of the present utility model;

[0037] Figure 10 A fourth structural schematic diagram of the oil filling flange provided in an embodiment of the present utility model;

[0038] Figure 11 A fifth structural schematic diagram of the oil filling flange provided in an embodiment of the present utility model;

[0039] Figure 12 A sixth structural schematic diagram of the oil filling flange provided in an embodiment of the present utility model;

[0040] Figure 13 A seventh structural schematic diagram of the oil filling flange provided in an embodiment of the present utility model;

[0041] Figure 14 This is a schematic diagram of the eighth structure of the oil filling flange provided in an embodiment of the present utility model;

[0042] Figure 15 This is a ninth structural schematic diagram of the oil filling flange provided in an embodiment of the utility model.

[0043] The following are the descriptions of the reference numerals:

[0044] 1-Oil filling flange; 11-Flange body; 111-First oil filling hole; 1111-First oil inlet end; 1112-First oil outlet end; 112-Second oil filling hole; 2-Screw compressor; 21-Casing; 211-Air inlet; 212-Exhaust port; 213-Low-pressure stage rotor cavity; 214-High-pressure stage rotor cavity; 215-Intermediate channel; 22-Female rotor; 23-Male rotor. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0047] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] See also Figures 1 to 4As shown, this embodiment provides a screw compressor 2, which can be an oil-injected two-stage screw compressor. The screw compressor 2 includes a housing 21 and an oil injection flange 1. The housing 21 has an air inlet 211 at the top and an exhaust port 212 at the bottom. The upper portion of the housing 21 is a low-pressure stage rotor chamber 213, in which a male rotor 23 and a female rotor 22 are disposed, which mesh with each other. The lower portion is a high-pressure stage rotor chamber 214, in which a male rotor 23 and a female rotor 22 are disposed, which mesh with each other. The air inlet 211 communicates with the low-pressure stage rotor chamber 213, which communicates with the high-pressure stage rotor chamber 214 via an intermediate passage 215, which in turn communicates with the exhaust port 212. The oil injection flange 1 is mounted on the housing 21 to inject oil into the intermediate passage 215.

[0049] The intermediate channel 215 is located below the low-pressure stage rotor cavity 213. In this embodiment, the area of the intermediate channel 215 corresponding to the female rotor 22 of the screw compressor 2 refers to the area of the intermediate channel 215 corresponding to the female rotor 22 in the low-pressure stage rotor cavity 213, and the area of the intermediate channel 215 corresponding to the male rotor 23 of the screw compressor 2 refers to the area of the intermediate channel 215 corresponding to the male rotor 23 in the low-pressure stage rotor cavity 213.

[0050] The working fluid enters the low-pressure stage rotor cavity 213 from the air inlet 211 for compression and its temperature rises. The working fluid with increased temperature enters the middle channel 215 and then enters the high-pressure stage rotor cavity 214 for compression, and is then discharged from the exhaust port 212. During this process, the working fluid flows along the wall and flows close to the bottom of the middle channel 215. Therefore, the working fluid flow rate is higher near the bottom of the middle channel 215.

[0051] It should be understood that during the compression process of the working fluid, the compressor requires a coolant to cool the compressed working fluid. The coolant can take various forms, such as, but not limited to, oil. In this embodiment, the coolant is injected into the intermediate passage 215 through the first and second oil injection hole groups of the oil injection flange 1. The terms "oil" or "coolant" used in this application should be understood to refer to any fluid capable of providing cooling.

[0052] In this embodiment, the working fluid includes any suitable compressible fluid, such as air, but not limited to air.

[0053] During operation of the screw compressor, due to the high rotational speed of the male rotor 23 in the low-pressure stage rotor cavity 213, the compressed, heated working fluid is discharged tangentially to the female rotor, resulting in a higher temperature on the female rotor side. To at least enhance the cooling effect of the working fluid on the female rotor side, this embodiment further provides an oil injection flange 1. The screw compressor 2 provided in this embodiment, by utilizing the oil injection flange 1 provided in this embodiment, can enhance the cooling effect of the working fluid on the female rotor side, thereby improving cooling efficiency.

[0054] The oil filling flange 1 provided in this embodiment is explained in detail below.

[0055] See also Figures 5 to 15 As shown, the oil filling flange 1 provided in this embodiment includes a flange body 11, which is used to be connected to the shell 21 of the screw compressor 2. The flange body 11 is provided with a first oil filling hole group and a second oil filling hole group. The first oil filling hole group includes at least one first oil filling hole 111, and the second oil filling hole group includes at least one second oil filling hole 112; the first oil filling hole 111 and the second oil filling hole 112 are both connected to the inlet end of the intermediate channel 215 of the screw compressor 2, and the first oil filling hole group is used to fill oil into the area of the intermediate channel 215 corresponding to the female rotor 22 of the screw compressor 2, and the second oil filling hole group is used to fill oil into the area of the intermediate channel 215 corresponding to the male rotor 23 of the screw compressor 2, and the oil inlet amount of the first oil filling hole group is greater than the oil inlet amount of the second oil filling hole group.

[0056] The oil filling flange 1 provided in this embodiment, when in use, installs the flange body 11 on the shell 21 of the screw compressor 2, so that the first oil filling hole 111 in the first oil filling hole group and the second oil filling hole 112 in the second oil filling hole group are both connected to the inlet end of the intermediate channel 215 of the screw compressor 2, and the first oil filling hole group is used to fill oil into the area of the intermediate channel 215 corresponding to the female rotor 22 of the screw compressor 2 to cool the working fluid on the female rotor side, and the second oil filling hole group is used to fill oil into the area of the intermediate channel 215 corresponding to the male rotor 23 of the screw compressor 2 to cool the working fluid on the male rotor 23 side. Since the oil inlet amount of the first oil filling hole group is greater than the oil inlet amount of the second oil filling hole group, the cooling effect of the working fluid on the female rotor side is enhanced, thereby improving the cooling efficiency.

[0057] In one embodiment, the oil injection range of the oil filling flange 1 is within the range from the bottom surface of the intermediate channel 215 to the middle position of the intermediate channel 215. This ensures that the refrigerant entering the intermediate channel 215 can fully contact the working fluid as much as possible, thereby cooling the high-temperature working fluid accumulated at the bottom of the intermediate channel 215 and improving the utilization rate of the refrigerant.

[0058] It should be understood that the bottom surface of the intermediate channel 215 refers to the lowest position of the inner wall of the intermediate channel 215 , and the distance between the lowest position and the high-pressure stage rotor cavity 214 is the shortest.

[0059] Exemplarily, when the bottom inner wall of the middle channel 215 is a plane, the plane is the bottom surface; when the bottom inner wall of the middle channel 215 is a curved surface, the lowest position of the curved surface is the bottom surface.

[0060] In one embodiment, the flange body 11 has opposing first and second surfaces, with first and second oil injection holes 111 and 112 extending therethrough. Exemplarily, the first and second surfaces are parallel. The flange body 11 is mounted to the housing 21 via fasteners, which may include bolts and nuts. In the installed state, the first surface faces away from the intermediate passage 215, while the second surface faces toward the intermediate passage 215.

[0061] For example, the shape of the flange body 11 can be a rectangle with four rounded corners. Of course, the shape of the flange body 11 is not limited to a rectangle, and can also be a circle, a square, or the like.

[0062] In some embodiments, see Figure 5 As shown, the arrow direction X indicates the extension direction of the intermediate channel 215. The depth directions of the first oil injection hole 111 and the second oil injection hole 112 are both aligned with the extension direction of the intermediate channel 215. This ensures that the oil injection direction is substantially aligned with the flow direction of the working fluid within the intermediate channel 215, thereby reducing turbulence. For example, the depth directions of the first oil injection hole 111 and the second oil injection hole 112 are both perpendicular to the first surface of the flange body 11.

[0063] In other embodiments, the first oil filling hole 111 has a first depth direction, and the second oil filling hole 112 has a second depth direction; along the first depth direction, the first oil filling hole 111 has a first oil inlet end 1111 and a first oil outlet end 1112; along the height direction of the intermediate channel 215, the position of the first oil inlet end 1111 is higher than the position of the first oil outlet end 1112; along the second depth direction, the second oil filling hole 112 has a second oil inlet end and a second oil outlet end; along the height direction of the intermediate channel 215, the position of the second oil inlet end is higher than the position of the second oil outlet end.

[0064] Take the first oil filling hole 111 as an example, see Figure 6As shown, the first oil inlet end 1111 is located on the first surface of the flange body 11, and the first oil outlet end 1112 is located on the second surface of the flange body 11. Since the position of the first oil inlet end 1111 is higher than the position of the first oil outlet end 1112, when the coolant enters the intermediate channel 215 along the inclined direction, there is a downward velocity component, so that the working fluid at the bottom of the intermediate channel 215 can be quickly cooled.

[0065] It should be noted that either the depth direction of the first oil filling hole 111 or the depth direction of the second oil filling hole 112 can be set as an inclined direction.

[0066] In this embodiment, the first depth direction is consistent with the second depth direction, which ensures that the coolant enters the middle flow channel from the first oil injection hole 111 and the second oil injection hole 112 in the same direction, thereby reducing turbulence.

[0067] In other embodiments, the first depth direction may also be arranged to form an angle with the second depth direction.

[0068] In one embodiment, see Figure 7 As shown, Figure 7 The dashed box in the figure is a schematic cross-sectional view of the inner wall of the intermediate channel 215. The minimum distance between the first oil hole 111 in the first oil hole group and the bottom surface of the intermediate channel 215 is a first distance D1, and the minimum distance between the second oil hole 112 in the second oil hole group and the bottom surface of the intermediate channel 215 is a second distance D2. The first distance D1 and the second distance D2 are equal, and neither the first distance nor the second distance is greater than 50% of the height H of the intermediate channel 215. This ensures that the refrigerant entering the intermediate channel 215 from the first oil hole 111 and the second oil hole 112 can cool the high-temperature working fluid near the bottom of the intermediate channel 215.

[0069] It should be understood that see Figure 5 and Figure 6 As shown, the minimum distance between the first oil filling hole 111 and the bottom surface of the intermediate channel 215 refers to the minimum distance between the first oil outlet end 1112 of the first oil filling hole 111 and the bottom surface of the intermediate channel 215; the minimum distance between the second oil filling hole 112 and the bottom surface of the intermediate channel 215 refers to the minimum distance between the second oil outlet end of the second oil filling hole 112 and the bottom surface of the intermediate channel 215.

[0070] In the first possible design, see Figure 7As shown, the number of the first oil injection hole group and the number of the second oil injection hole group are both one, and the number of the first oil injection hole 111 and the second oil injection hole 112 are both one. The opening area of the first oil injection hole group is larger than the opening area of the second oil injection hole group. In other words, the opening area of the first oil injection hole 111 is larger than the opening area of the second oil injection hole 112. This ensures that the oil inlet amount of the first oil injection hole group is greater than the oil inlet amount of the second oil injection hole group.

[0071] For example, in this embodiment, the first oiling hole 111 and the second oiling hole 112 are both circular in shape, and the diameter of the first oiling hole 111 is larger than that of the second oiling hole 112. The centers of the first oiling hole 111 and the second oiling hole 112 are located at the same height. The minimum distance between the first oiling hole 111 and the bottom surface of the intermediate channel 215 is the distance between the center of the first oiling hole 111 and the lowest point of the inner wall of the intermediate channel 215.

[0072] It should be noted that the shapes of first oil hole 111 and second oil hole 112 are not limited to circular, but can also be elliptical, rectangular, or other shapes. The shapes of first oil hole 111 and second oil hole 112 can be the same or different, as long as the opening area of first oil hole 111 is larger than the opening area of second oil hole 112. For example, when first oil hole 111 is rectangular, the minimum distance between first oil hole 111 and the bottom surface of intermediate channel 215 is calculated based on the intersection of the two diagonals of the rectangle.

[0073] It should be understood that there is no limit on the distance between the first oil filling hole 111 and the second oil filling hole 112 and the edge of the flange body 11, as long as the flange body 11 is installed in the shell 21 of the screw compressor 2, the first distance and the second distance are not greater than 50% of the height H of the intermediate channel 215.

[0074] Exemplarily, both the first distance and the second distance are 20% to 30% of the height H of the middle channel 215 .

[0075] In a second possible design, the number of the first oil injection hole group and the number of the second oil injection hole group are both one, and the total number of the first oil injection holes 111 is greater than the total number of the second oil injection holes 112 .

[0076] In the second possible design, the number of the first oil filling holes 111 is no less than two, and the number of the second oil filling hole 112 is at least one.

[0077] For example, the number of the first oil injection holes 111 may be, but is not limited to, three times the number of the second oil injection holes 112 .

[0078] For example, see Figure 8As shown, there are 15 first oil holes 111 and 11 second oil holes 112. The distances between all first oil holes 111 and the bottom surface of the intermediate channel 215 are equal, i.e., the first distance. The distances between all second oil holes 112 and the bottom surface of the intermediate channel 215 are equal, i.e., the second distance. The opening areas of all first oil holes 111 and second oil holes 112 are the same. This method facilitates the production and processing of the oil filling flange 1 and ensures that the oil inlet volume of the first oil hole group is greater than that of the second oil hole group.

[0079] Of course, in other embodiments, the opening areas of the first oil injection holes 111 and the second oil injection holes 112 may also be different; or the opening areas of at least part of the first oil injection holes 111 and at least part of the second oil injection holes 112 may be the same, as long as the oil inlet amount of the first oil injection hole group can be greater than the oil inlet amount of the second oil injection hole group.

[0080] In this second possible design, the opening area of the first oil hole group refers to the sum of the opening areas of all first oil holes 111 in the first oil hole group, and the opening area of the second oil hole group refers to the sum of the opening areas of all second oil holes 112 in the second oil hole group. Since the number of first oil holes 111 is greater than the number of second oil holes 112, the opening area of the first oil hole group is greater than the opening area of the second oil hole group.

[0081] In the second possible design, all the first oil filling holes 111 are evenly spaced, all the second oil filling holes 112 are evenly spaced, and the distance between two adjacent first oil filling holes 111 is equal to the distance between two adjacent second oil filling holes 112 .

[0082] In a third possible design, see Figure 9 As shown, there are multiple first oil holes 111 and multiple second oil holes 112. The multiple first oil holes 111 and the multiple second oil holes 112 are spaced apart along the length of the flange body 11, and the distance between two adjacent first oil holes 111 is smaller than the distance between two adjacent second oil holes 112. In other words, the arrangement density of the first oil holes 111 is greater than the arrangement density of the second oil holes 112.

[0083] Exemplarily, multiple first oil holes 111 are evenly spaced along the length direction of the flange body 11, and multiple second oil holes 112 are evenly spaced along the length direction of the flange body 11, and the distance between two adjacent first oil holes 111 is smaller than the distance between two adjacent second oil holes 112.

[0084] Of course, the plurality of first oil filling holes 111 may also be arranged at uneven intervals, and the plurality of second oil filling holes 112 may also be arranged at uneven intervals.

[0085] In the third possible design, the shape and size of the first oil filling hole 111 may be the same as the shape and size of the second oil filling hole 112 .

[0086] Of course, the shape of the first oil filling hole 111 can also be different from the shape of the second oil filling hole 112, and the size of the first oil filling hole 111 can also be different from the size of the second oil filling hole 112, as long as the oil inlet amount of the first oil filling hole group is greater than the oil inlet amount of the second oil filling hole group.

[0087] It should be noted that, when the number of the first oil hole group and the number of the second oil hole group are both one, and the number of the first oil hole 111 and the second oil hole 112 are both multiple, as long as the distance between one first oil hole 111 and the bottom surface of the intermediate channel 215 is the first distance, and as long as the distance between one second oil hole 112 and the bottom surface of the intermediate channel 215 is equal to the first distance, and the oil inlet amount of the first oil hole group is greater than the oil inlet amount of the second oil hole group, the distance between the remaining first oil holes 111 and the second oil hole 112 and the bottom surface of the intermediate channel 215 may also be greater than the first distance.

[0088] In a fourth possible design, there are multiple first oil hole groups, and the multiple first oil hole groups are spaced apart along the height direction of the intermediate channel 215; among the multiple first oil hole groups, there are multiple first oil holes 111 in the first oil hole group away from the mother rotor 22, and the distances between the multiple first oil holes 111 and the bottom surface of the intermediate channel 215 are all the first distances.

[0089] For example, see Figure 10 As shown, the number of the first oil filling hole group is two, and the distances between the multiple first oil filling holes 111 in the first oil filling hole group away from the mother rotor 22 and the bottom surface of the middle channel 215 are all the first distances.

[0090] In the fourth possible design, the first distance is 20% to 30% of the height of the middle channel 215 .

[0091] In the fourth possible design, among the multiple first oil hole groups, the number of first oil holes 111 in at least some of the first oil hole groups is the same, or the number of first oil holes 111 in all the first oil hole groups is different.

[0092] In the fourth possible design, the number of the second oil filling hole group is one, the number of the second oil filling holes 112 is multiple, and the distances between the multiple second oil filling holes 112 and the bottom surface of the middle channel 215 are all the second distances.

[0093] In some embodiments, see Figure 10As shown, all the first oil filling holes 111 and the second oil filling holes 112 are evenly spaced along the length direction of the flange body 11 .

[0094] In other embodiments, the distance between two adjacent first oil injection holes 111 is smaller than the distance between two adjacent second oil injection holes 112 .

[0095] For example, see Figure 11 As shown, along the height direction of the middle channel 215 , the distance between two adjacent first oil filling holes 111 in the lowest first oil filling hole group is smaller than the distance between two adjacent second oil filling holes 112 .

[0096] For example, see Figure 12 As shown, the distance between two adjacent first oil holes 111 in each first oil hole group is smaller than the distance between two adjacent second oil holes 112. In different first oil hole groups, the distance between two adjacent first oil holes 111 can be the same or different.

[0097] In this fourth possible design, the sum of the number of first oil holes 111 in the bottommost first oil hole group and the number of second oil holes 112 in the second oil hole group is greater than the number of first oil holes 111 in any of the remaining first oil hole groups. This ensures that the refrigerant can better cool the working fluid collected at the bottom of the intermediate channel 215.

[0098] In a fifth possible design, there are multiple second oil injection hole groups, and the multiple second oil injection hole groups are arranged at intervals along the height direction of the middle channel 215.

[0099] When the number of the second oiling hole group is equal to the number of the first oiling hole group, see Figure 13 As shown, multiple second oil injection hole groups and multiple first oil injection hole groups can be arranged in a row in a one-to-one correspondence, see Figure 14 As shown, the second oil hole group and the first oil hole group at least away from the mother rotor 22 may be arranged in a one-to-one correspondence in a row, and at least part of the second oil hole groups at other positions may be staggered with the first oil hole group.

[0100] For example, the number of the second oil injection hole groups is two, and the two second oil injection hole groups correspond to the two first oil injection hole groups in a row.

[0101] For example, see Figure 13 As shown, in each row of the first oil filling hole group and the second oil filling hole group, the number of the first oil filling holes 111 is greater than the number of the second oil filling holes 112 .

[0102] For example, see Figure 15As shown, in one row of the first oil hole group and the second oil hole group, the number of the first oil holes 111 is greater than the number of the second oil holes 112, and in another row of the first oil hole group and the second oil hole group, the number of the first oil holes 111 is less than the number of the second oil holes 112, and the total number of the first oil holes 111 in all the first oil hole groups is greater than the total number of the second oil holes 112 in all the second oil hole groups.

[0103] In this fifth possible design, along the height direction of the middle channel 215, the sum of the number of first oil holes 111 in the first oil hole group located at the bottom and the second oil holes 112 in the second oil hole group located at the bottom is greater than the sum of the number of first oil holes 111 and second oil holes 112 at any other position.

[0104] For example, see Figure 13 As shown, the number of first oil holes 111 in the first oil hole group at the bottom is 16, and the number of second oil holes 112 in the second oil hole group at the bottom is 12, and the sum of the two is 28; the number of first oil holes 111 in the first oil hole group at the same height above is 16, and the number of second oil holes 112 in the second oil hole group is 8, and the sum of the two is 24.

[0105] For example, see Figure 14 As shown, the number of first oil holes 111 in the first oil hole group at the bottom is 16, and the number of second oil holes 112 in the second oil hole group at the bottom is 12, and the sum of the two is 28; there is only the first oil hole group at the same height position above, and the number of first oil holes 111 in the first oil hole group is 16; there is only the second oil hole group at the same height position at the top, and the number of second oil holes 112 in the second oil hole group is 12.

[0106] In summary, the oil filling flange 1 provided in this embodiment enhances the cooling effect on the mother rotor side of the screw compressor 2 and improves the cooling efficiency through various technical means. The various technical means may include but are not limited to one or a combination of the following:

[0107] (1) The distances between the first oil filling hole 111 and the second oil filling hole 112 and the bottom surface of the intermediate channel 215 are equal, and neither is greater than 50% of the height H of the intermediate channel 215 .

[0108] (2) The total number of the first oil injection holes 111 is greater than the total number of the second oil injection holes 112;

[0109] (3) The opening area of the first oil injection hole group is larger than the opening area of the second oil injection hole group;

[0110] (4) The arrangement density of the first oil injection holes 111 is greater than the arrangement density of the second oil injection holes 112;

[0111] (5) Adjustment of the depth direction of the first oil filling hole 111 and the depth direction of the second oil filling hole 112;

[0112] (6) The oil injection range of the oil filling flange 1 is within the range between the bottom surface of the intermediate channel 215 and the middle position of the intermediate channel 215;

[0113] It should be noted that the working process of the screw compressor should be understandable to those skilled in the art, and is well known and easy to implement for those skilled in the art, so it will not be described in detail in this embodiment.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil filling flange, characterized in that: include: The flange body is used to be connected to the casing of the screw compressor. The flange body is provided with a first oil injection hole group and a second oil injection hole group. The first oil injection hole group includes at least one first oil injection hole, and the second oil injection hole group includes at least one second oil injection hole; the first oil injection hole and the second oil injection hole are both connected to the inlet end of the intermediate channel of the screw compressor. The first oil injection hole group is used to inject oil into the area of the intermediate channel corresponding to the female rotor of the screw compressor, and the second oil injection hole group is used to inject oil into the area of the intermediate channel corresponding to the male rotor of the screw compressor. The oil inlet amount of the first oil injection hole group is greater than the oil inlet amount of the second oil injection hole group.

2. The oil filling flange according to claim 1, characterized in that: The minimum distance between the first oil filling hole in the first oil filling hole group and the bottom surface of the intermediate channel is a first distance, the minimum distance between the second oil filling hole in the second oil filling hole group and the bottom surface of the intermediate channel is a second distance, the first distance is equal to the second distance, and the first distance and the second distance are both no greater than 50% of the height of the intermediate channel.

3. The oil filling flange according to claim 2, characterized in that: There are multiple first oil hole groups, and the multiple first oil hole groups are spaced apart along the height direction of the intermediate channel; among the multiple first oil hole groups, there are multiple first oil holes in the first oil hole group away from the mother rotor, and the distances between the multiple first oil holes and the bottom surface of the intermediate channel are all the first distances.

4. The oil filling flange according to claim 3, characterized in that: The first distance is 20% to 30% of the height of the middle channel.

5. The oil filling flange according to claim 3, characterized in that: The sum of the number of the first oil filling holes in the lowermost first oil filling hole group and the number of the second oil filling holes in the second oil filling hole group is greater than the number of the first oil filling holes in any other first oil filling hole group.

6. The oil filling flange according to claim 3, characterized in that: Among the plurality of first oil filling hole groups, at least some of the first oil filling hole groups have the same number of the first oil filling holes; Alternatively, the numbers of the first oil filling holes in the plurality of first oil filling hole groups are different.

7. The oil filling flange according to claim 3, characterized in that: There are multiple second oil injection hole groups, and the multiple second oil injection hole groups are spaced apart along the height direction of the middle channel.

8. The oil filling flange according to claim 7, characterized in that: Along the height direction of the middle channel, the sum of the number of first oil holes in the lowest first oil hole group and the number of second oil holes in the lowest second oil hole group is greater than the sum of the number of first oil holes and second oil holes at any other position.

9. The oil filling flange according to any one of claims 1 to 8, characterized in that: The total number of the first oil injection holes is greater than the total number of the second oil injection holes.

10. The oil filling flange according to any one of claims 1 to 8, characterized in that: The opening area of the first oil injection hole group is larger than the opening area of the second oil injection hole group.

11. The oil filling flange according to claim 10, characterized in that: The first oil filling hole and the second oil filling hole are both circular in shape, and the diameter of the first oil filling hole is larger than the diameter of the second oil filling hole.

12. The oil filling flange according to any one of claims 1 to 8, characterized in that: There are multiple first oil injection holes, and there are multiple second oil injection holes. The multiple first oil injection holes and the multiple second oil injection holes are spaced apart along the length direction of the flange body, and the distance between two adjacent first oil injection holes is smaller than the distance between two adjacent second oil injection holes.

13. The oil filling flange according to any one of claims 1 to 8, characterized in that: The depth direction of the first oil filling hole and the depth direction of the second oil filling hole are both consistent with the extension direction of the middle channel.

14. The oil filling flange according to any one of claims 1 to 8, characterized in that: The first oil filling hole has a first depth direction, and the second oil filling hole has a second depth direction; Along the first depth direction, the first oil filling hole has a first oil inlet end and a first oil outlet end; along the height direction of the intermediate channel, the position of the first oil inlet end is higher than the position of the first oil outlet end; And / or, along the second depth direction, the second oil filling hole has a second oil inlet end and a second oil outlet end; along the height direction of the intermediate channel, the position of the second oil inlet end is higher than the position of the second oil outlet end.

15. The oil filling flange according to claim 14, characterized in that: The first depth direction is consistent with the second depth direction.

16. The oil filling flange according to any one of claims 1 to 8, characterized in that: The oil injection range of the oil injection flange is within the range from the bottom surface of the intermediate channel to the middle position of the intermediate channel.

17. A screw compressor, characterized in that: The oil filling flange comprises the oil filling flange according to any one of claims 1 to 16.

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