Lead screw mechanism and equipment

Abstract

The invention discloses a lead screw mechanism and equipment. The equipment comprises the lead screw mechanism, and the lead screw mechanism comprises a lead screw shaft, a first fixing part, a second fixing part, a first bearing assembly and a second bearing assembly. A cooling channel is formed in the lead screw shaft, the first fixing part is arranged at the first end of the lead screw shaft, a first cooling cavity and a first channel are formed in the first fixing part, and the first channel communicates with the first cooling cavity. The second fixing part is arranged at the second end of the lead screw shaft, a second cooling cavity and a second channel are formed in the second fixing part, and the second channel communicates with the second cooling cavity. The first bearing assembly is located within the first cooling chamber and the second bearing assembly is located within the second cooling chamber. Wherein the first end of the lead screw shaft rotatably penetrates through the first cooling cavity, the second end of the lead screw shaft rotatably penetrates through the second cooling cavity, and the first cooling cavity is communicated with the second cooling cavity through the cooling channel. The problem that in the prior art, a bearing is deformed due to too high temperature is solved.

Description

Technical Field

[0001] The present application relates to the field of mechanical manufacturing technology, and in particular to a screw mechanism and equipment. Background Art

[0002] When the screw rotates at high speed, it will generate a lot of heat. If the temperature of the screw is too high, it will cause thermal deformation of the screw and ultimately fail to maintain normal working accuracy.

[0003] The existing method of cooling the lead screw is to cool the outside of the lead screw by coolant or air, thereby reducing the temperature of the lead screw. One drawback of this method is that the temperature inside the lead screw is too high, causing the lead screw to still deform. Another existing method of cooling the lead screw is to open a cooling channel on the lead screw and pass coolant into the cooling channel to reduce the temperature of the lead screw. However, it is difficult to cool the bearings sleeved on the lead screw using this cooling method, resulting in deformation of the bearings due to excessive temperature. Summary of the invention

[0004] The main purpose of the present application is to provide a screw mechanism and a device to at least solve the problem of deformation of bearings due to excessive temperature in the prior art.

[0005] According to one aspect of the present application, there is provided a screw mechanism, comprising:

[0006] A screw shaft, wherein a cooling channel is provided on the screw shaft, wherein the cooling channel extends along the axial direction of the screw shaft, and wherein a first end of the screw shaft has a first opening, wherein the first opening is communicated with the cooling channel, and a second end of the screw shaft has a second opening, wherein the second opening is communicated with the cooling channel;

[0007] a first fixing portion, wherein the first fixing portion is disposed at a first end of the screw shaft, a first cooling chamber and a first channel are formed on the first fixing portion, and the first channel is communicated with the first cooling chamber;

[0008] a second fixing portion, the second fixing portion being arranged at the second end of the screw shaft, the second fixing portion being provided with a second cooling chamber and a second channel, and the second channel being in communication with the second cooling chamber;

[0009] A first bearing assembly, wherein the first bearing assembly is sleeved on the screw shaft and the first bearing assembly is located in the first cooling chamber;

[0010] A second bearing assembly, wherein the second bearing assembly is sleeved on the screw shaft and is located in the second cooling chamber;

[0011] The first end of the screw shaft can rotatably pass through the first cooling chamber, the second end of the screw shaft can rotatably pass through the second cooling chamber, and the first cooling chamber is connected with the second cooling chamber through the cooling channel.

[0012] Furthermore, the minimum outer diameter D1 of the screw shaft and the diameter D2 of the cooling channel satisfy the relationship: 2.25≤D1 / D2≤4.375, wherein D2 satisfies the relationship: 16mm≤D2≤20mm.

[0013] Further, the first fixing portion comprises a first bearing seat and a first end cover assembly, the first bearing seat is sealedly connected to the first end cover assembly, and along the axial direction of the screw shaft, a first locking assembly is provided on a side of the first bearing assembly away from the first bearing seat;

[0014] The first end cover assembly is provided with a first groove, the first bearing seat is provided with a second groove, the first groove and the second groove are arranged to form the first cooling chamber, the first locking assembly is arranged in the first groove, and there is a gap between the first locking assembly and the inner wall surface of the first groove, the first channel is connected with the first groove, and the first bearing assembly is embedded in the second groove.

[0015] Further, the first groove comprises a first circular groove, and along the radial direction of the screw shaft, a minimum distance A between the first locking assembly and the inner wall surface of the first circular groove satisfies the relationship: 24 mm ≤ A ≤ 28 mm; and / or,

[0016] Along the axial direction of the screw shaft, a minimum distance B between the first locking assembly and the inner wall surface of the first circular groove satisfies the relationship: 13mm≤B≤17mm.

[0017] Further, the second fixing portion comprises a second bearing seat and a second end cover assembly, the second bearing seat is sealedly connected to the second end cover assembly, and along the axial direction of the screw shaft, a second locking assembly is provided on a side of the second bearing assembly away from the second bearing seat;

[0018] The second end cover assembly is provided with a third groove, and the second bearing seat is provided with a fourth groove. The third groove and the fourth groove are arranged to form the second cooling chamber. The second locking assembly is arranged in the third groove, and there is a gap between the second locking assembly and the inner wall surface of the third groove. The second channel is connected to the third groove, and the second bearing assembly is embedded in the fourth groove.

[0019] Further, the third groove includes a second circular groove, and along the radial direction of the screw shaft, the minimum distance C between the second locking assembly and the inner wall surface of the second circular groove satisfies the relationship: 8mm≤C≤10mm; and / or,

[0020] Along the axial direction of the screw shaft, a minimum distance D between the second locking assembly and the inner wall surface of the second circular groove satisfies the relationship: 8mm≤D≤12mm.

[0021] Furthermore, the screw mechanism also includes an oil tank, which is connected to the first channel through an oil pipeline. A temperature control component is provided on the oil tank, and the temperature control component is used to adjust the temperature of the oil in the oil tank.

[0022] Further, along the axial direction of the lead screw, a first stopper and a first locking assembly are respectively provided on both sides of the first bearing assembly, the first stopper abuts against a side wall of the first cooling chamber close to the second cooling chamber, the first locking assembly is provided on a side of the first bearing assembly away from the first stopper, and is sleeved on the outer periphery of the lead screw shaft, the first locking assembly is used to abut against the inner ring of the first bearing assembly, so that the outer ring of the first bearing assembly abuts against the first stopper;

[0023] Along the axial direction of the screw, a second stopper and a second locking assembly are respectively provided on both sides of the second bearing assembly, the second stopper is stopped at the side wall of the second cooling chamber close to the first cooling chamber, the second locking assembly is arranged on the side of the second bearing assembly away from the second stopper, and is sleeved on the outer periphery of the screw shaft, the second locking assembly is used to stop the inner ring of the second bearing group so that the outer ring of the second bearing group is stopped on the second stopper.

[0024] Further, the first locking assembly includes a first locking member and a third stop member, the third stop member is arranged between the first locking member and the first bearing assembly, and the first locking member can move along the axial direction so that the third stop member abuts against the inner ring of the first bearing assembly;

[0025] The second locking assembly includes a second locking member and a fourth stop member, wherein the fourth stop member is disposed between the second locking member and the second bearing assembly, and the second locking member can move along the axial direction so that the fourth stop member stops against the inner ring of the second bearing assembly.

[0026] On the other hand, the present application also provides a device, which includes the above-mentioned screw mechanism.

[0027] Compared with the prior art, the present application has a first cooling chamber and a second cooling chamber respectively provided on the first fixed part and the second fixed part, and a cooling channel is opened on the screw shaft. By directing the coolant or cooling oil from the first cooling chamber to the cooling channel and then to the second cooling chamber, the first bearing assembly, the screw shaft and the second bearing assembly can all obtain better heat dissipation effect, thereby avoiding excessive temperature of the screw shaft, the first bearing assembly or the second bearing assembly, which affects the accuracy of the screw mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 It is a structural schematic diagram of the screw mechanism disclosed in this application;

[0030] Figure 2 A cross-sectional view of the screw mechanism disclosed in the present application;

[0031] Figure 3 for Figure 2 Enlarged schematic diagram of the middle I area;

[0032] Figure 4 for Figure 2 Enlarged schematic diagram of the middle II area;

[0033] Figure 5 It is a partial structural cross-sectional view of the screw structure disclosed in the present application (excluding the first locking assembly, the second locking assembly, the skeleton oil seal, the first stopper and the second stopper);

[0034] Figure 6 for Figure 5 Enlarged schematic diagram of the middle III region;

[0035] Figure 7 for Figure 5 Schematic diagram of the enlarged IV region.

[0036] The above drawings include the following reference numerals:

[0037] 10. first fixing portion; 11. first passage; 12. first cooling chamber; 20. second fixing portion; 21. second passage; 22. second cooling chamber; 30. screw shaft; 31. cooling passage; 32. first opening; 33. second opening; 40. first bearing assembly; 50. second bearing assembly; 60. first locking assembly; 61. first locking member; 62. third stop member; 70. second locking assembly; 71. second locking member; 81. first stop member; 82. second stop member Block; 83, skeleton oil seal; 90, sealing ring; 101, first bearing seat; 102, first end cover assembly; 121, first groove; 122, second groove; 123, first sealing groove; 124, first mounting groove; 201, second bearing seat; 202, second end cover assembly; 221, third groove; 222, fourth groove; 223, second sealing groove; 1021, first flange; 1022, second flange; 1023, cover plate; 2021, third flange. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0039] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0041] See also Figures 1 to 7As shown, according to an embodiment of the present application, a screw mechanism is provided, which includes a screw shaft 30 , a first fixing portion 10 , a second fixing portion 20 , a first bearing assembly 40 and a second bearing assembly 50 .

[0042] The screw shaft 30 is provided with a cooling channel 31, which extends along the axial direction of the screw shaft 30, and the first end of the screw shaft 30 has a first opening 32, which is connected to the cooling channel 31, and the second end of the screw shaft 30 has a second opening 33, which is connected to the cooling channel 31. The first fixing part 10 is arranged at the first end of the screw shaft 30, and the first fixing part 10 is provided with a first cooling chamber 12 and a first channel 11, and the first channel 11 is connected to the first cooling chamber 12. The second fixing part 20 is arranged at the second end of the screw shaft 30, and the second fixing part 20 is provided with a second cooling chamber 22 and a second channel 21, and the second channel 21 is connected to the second cooling chamber 22. The first bearing assembly 40 is sleeved on the screw shaft 30, and the first bearing assembly 40 is located in the first cooling chamber 12. The second bearing assembly 50 is sleeved on the screw shaft 30, and the second bearing assembly 50 is located in the second cooling chamber 22. The first end of the screw shaft 30 rotatably passes through the first cooling chamber 12 , and the second end of the screw shaft 30 rotatably passes through the second cooling chamber 22 . The first cooling chamber 12 is connected to the second cooling chamber 22 through the cooling channel 31 .

[0043] Specifically, the first fixing part 10 and the second fixing part 20 are used to be connected to a predetermined device. Usually, the coolant or cooling oil is continuously injected into the first channel 11. When the coolant or cooling oil enters the first cooling chamber 12 from the first channel 11, since the first bearing assembly 40 is arranged in the first cooling chamber 12, the coolant or cooling oil flows to take away the heat on the first bearing assembly 40. After that, the coolant enters the cooling channel 31 of the screw shaft 30 from the first opening 32, so that the heat in the screw is taken away under the flow of the coolant or cooling oil. Subsequently, the coolant or cooling oil enters the second cooling chamber 22 from the second opening 33, and the coolant and cooling oil contact the second bearing assembly 50, so as to take away the heat on the second bearing assembly 50, and the coolant or cooling oil finally flows into other components through the second channel 21. When the cooling oil is used to cool the screw mechanism, the cooling oil can also lubricate the first bearing assembly 40 and the second bearing assembly 50, thereby avoiding excessive friction between the bearing and the screw shaft 30.

[0044] Compared with the prior art, the present application is provided with a first cooling chamber 12 and a second cooling chamber 22 on the first fixing portion 10 and the second fixing portion 20, respectively, and a cooling channel 31 is provided on the screw shaft 30. By directing the coolant or cooling oil from the first cooling chamber 12 to the cooling channel 31 and then to the directional flow channel of the second cooling chamber 22, the first bearing assembly 40, the screw shaft 30 and the second bearing assembly 50 can all obtain a better heat dissipation effect, thereby avoiding the screw shaft 30, the first bearing assembly 40 or the second bearing assembly 50 from being overheated, thereby affecting the accuracy of the screw mechanism. It is worth mentioning that the first end of the screw shaft 30 usually needs to be connected to the motor, so the first end of the screw shaft 30 needs to pass through the first cooling chamber 12, and the second end of the screw shaft 30 does not need to be connected to other equipment. Therefore, in order to improve the cooling effect of the screw shaft 30, the second end of the screw shaft 30 is arranged in the second cooling chamber 22.

[0045] Further, the minimum outer diameter D1 of the screw shaft 30 and the diameter D2 of the cooling channel 31 satisfy the relationship: 2.25≤D1 / D2≤4.375, wherein D2 satisfies the relationship: 16mm≤D2≤20mm.

[0046] In this embodiment, the diameter D2 of the cooling channel 31 is positively correlated with the heat dissipation capacity of the screw shaft 30. If D1 / D2 is greater than 4.375, the cooling channel 31 is smaller than the screw shaft 30, which will cause the refrigerant in the cooling channel 31 to dissipate heat unevenly to the screw shaft 30. For example, the outer surface of the screw shaft 30 is difficult to cool down by the refrigerant in the cooling channel 31. If D1 / D2 is less than 2.25, the cooling channel 31 is too large relative to the screw shaft 30, which reduces the transmission stiffness of the screw shaft 30 and ultimately makes the screw shaft 30 more susceptible to deformation. The values ​​of D1 / D2 can be 2.25, 2.5, 2.725, 3, 3.25, 3.5, 3.725, 4, 4.25 and 4.375. The values ​​of D2 can be 16mm, 17mm, 18mm, 19mm and 20mm.

[0047] Furthermore, the first fixed portion 10 includes a first bearing seat 101 and a first end cover assembly 102, the first bearing seat 101 is sealed and connected to the first end cover assembly 102, and along the axial direction of the screw shaft 30, a first locking assembly 60 is provided on the side of the first bearing assembly 40 away from the first bearing seat 101; the first end cover assembly 102 is provided with a first groove 121, and the first bearing seat 101 is provided with a second groove 122, the first groove 121 and the second groove 122 are arranged to form a first cooling chamber 12, the first locking assembly 60 is provided in the first groove 121, and the first locking assembly 60 has a gap with the inner wall surface of the first groove 121, the first channel 11 is connected to the first groove 121, and the first bearing assembly 40 is embedded in the second groove 122.

[0048] Specifically, in the present embodiment, the first locking assembly 60 is used to lock the first bearing assembly 40 to prevent the first bearing assembly 40 from being subjected to axial force when the screw shaft 30 rotates, causing the first bearing assembly 40 to move in the axial direction. The first bearing assembly 40 is embedded in the second groove 122, so that the outer ring of the first bearing assembly 40 abuts against the inner wall surface of the second groove 122, thereby preventing the outer ring of the first bearing assembly 40 from rotating with the screw shaft 30 when the screw shaft 30 rotates. In addition, since there is a gap between the first locking assembly 60 and the inner wall surface of the first groove 121, and the first opening 32 rotates with the rotation of the screw shaft 30, when the refrigerant enters the first groove 121 from the first channel 11, the refrigerant can be stored in the first groove 121 for a certain period of time, thereby increasing the heat transfer time between the refrigerant and the first bearing assembly 40 and the outer surface of the first end of the screw shaft 30, thereby improving the cooling effect of the refrigerant on the screw mechanism. On the other hand, the first groove 121 is connected to the second groove 122 . When the refrigerant is cooling oil, the cooling oil enters the second groove 122 , which can not only dissipate heat for the first bearing assembly 40 , but also lubricate the first bearing assembly 40 .

[0049] In addition, the first end cover assembly 102 includes a first flange 1021, a second flange 1022 and a cover plate 1023. The first flange 1021 is fixedly connected to the first bearing seat 101, and a sealing ring 90 is arranged between the first flange 1021 and the first bearing seat 101. The second flange 1022 is connected to the end of the first flange 1021 away from the first bearing seat 101, and a sealing ring 90 is also arranged between the second flange 1022 and the first flange 1021. The cover plate 1023 is connected to the second flange 1022, and a avoidance hole is opened on the cover plate 1023, and the avoidance hole is communicated with the first groove 121, and the avoidance hole is used to avoid the screw shaft 30, so that the screw shaft 30 can pass through the first cooling channel 31. A first mounting groove 124 is formed on one side of the second flange 1022 close to the cover plate 1023 . A skeleton oil seal 83 is embedded in the first mounting groove 124 , and the skeleton oil seal 83 is sleeved on the outer circumference of the screw shaft 30 .

[0050] Further, the first groove 121 includes a first circular groove, and along the radial direction of the screw shaft 30, the minimum distance A between the first locking assembly 60 and the inner wall surface of the first circular groove satisfies the relationship: 24mm≤A≤28mm. In addition, along the axial direction of the screw shaft 30, the minimum distance B between the first locking assembly 60 and the inner wall surface of the first circular groove satisfies the relationship: 13mm≤B≤17mm.

[0051] Specifically, the minimum distance A between the first locking assembly 60 and the inner wall of the first circular groove along the radial direction of the screw shaft 30, and the minimum distance B between the first locking assembly 60 and the inner wall of the first circular groove along the axial direction of the screw shaft 30 are related to the time that the refrigerant can be stored in the first groove 121. That is to say, there is a redundant space between the first circular groove and the first locking assembly 60, so that the refrigerant can be stored in the redundant space. If A is less than 24mm or B is less than 13mm, the refrigerant entering the first groove 121 from the first channel 11 stays in the first groove 121 for too short a time, so that the refrigerant cannot fully contact the outer peripheral surface of the screw shaft 30 and the first bearing assembly 40, thereby reducing the heat dissipation effect on the screw shaft 30 and the first bearing assembly 40. If A is greater than 28 mm or B is greater than 17 mm, the first bearing seat 101 and the first end cover assembly 102 need to be larger, that is, the first flange 1021 and the second flange 1022 need to be non-standard parts, resulting in excessively high manufacturing costs for the screw mechanism.

[0052] Furthermore, the second fixed portion 20 includes a second bearing seat 201 and a second end cover assembly 202, the second bearing seat 201 is sealed and connected to the second end cover assembly 202, and along the axial direction of the screw shaft 30, a second locking assembly 70 is provided on the side of the second bearing assembly 50 away from the second bearing seat 201; the second end cover assembly 202 is provided with a third groove 221, and the second bearing seat 201 is provided with a fourth groove 222, the third groove 221 and the fourth groove 222 are arranged to form a second cooling chamber 22, the second locking assembly 70 is arranged in the third groove 221, and the second locking assembly 70 has a gap with the inner wall surface of the third groove 221, the second channel 21 is connected to the third groove 221, and the second bearing assembly 50 is embedded in the fourth groove 222.

[0053] Similarly, the second bearing assembly 50 is embedded in the fourth groove 222, so that the outer ring of the second bearing assembly 50 is stopped on the inner wall surface of the fourth groove 222, thereby preventing the outer ring of the second bearing assembly 50 from rotating when the screw shaft 30 rotates. The second locking assembly 70 is used to lock the second bearing assembly 50 to prevent the second bearing assembly 50 from moving in the axial direction of the screw shaft 30. When the refrigerant enters the second cooling chamber 22 from the cooling channel 31, since there is a certain gap between the second locking member 71 and the inner wall surface of the third groove 221, that is, the third groove 221 can store a certain amount of refrigerant, thereby increasing the heat exchange time between the refrigerant and the second bearing assembly 50, so as to improve the heat dissipation effect of the refrigerant on the second bearing assembly 50. On the other hand, since the third groove 221 is connected to the fourth groove 222, when the refrigerant is cooling oil, the cooling oil can not only dissipate heat for the second bearing assembly 50, but also lubricate the second bearing assembly 50. That is to say, this embodiment can dissipate heat for the screw shaft 30, the first bearing assembly 40 and the second bearing assembly 50 through a simple structural design, and can also provide lubrication for the first bearing assembly 40 and the second bearing assembly 50 while dissipating heat, thereby preventing the first bearing assembly 40 and the second bearing assembly 50 from having excessive friction with the screw shaft 30, which causes the first bearing assembly 40 and the second bearing assembly 50 to be easily deformed. In this embodiment, the second end cover assembly 202 includes a third flange 2021, which is connected to the second bearing seat 201, and a sealing ring 90 is provided between the third flange 2021 and the second bearing seat 201.

[0054] Further, the third groove 221 includes a second circular groove, and along the radial direction of the screw shaft 30, the minimum distance C between the second locking assembly 70 and the inner wall surface of the second circular groove satisfies the relationship: 8mm≤C≤10mm. Along the axial direction of the screw shaft 30, the minimum distance D between the second locking assembly 70 and the inner wall surface of the second circular groove satisfies the relationship: 8mm≤D≤12mm.

[0055] It is understandable that when C is less than 8mm or D is less than 8mm, the redundant space in the third groove 221 is less, that is, the refrigerant that can be stored in the third groove 221 is reduced, and the refrigerant cannot fully contact the screw shaft 30 and the second bearing assembly 50, resulting in a reduction in the cooling effect of the refrigerant on the screw shaft 30 and the second bearing assembly 50. When C is greater than 10mm and D is greater than 12mm, the third flange 2021 cannot use standard parts, and the third flange 2021 needs to be customized additionally, resulting in excessively high manufacturing costs of the screw mechanism. The values ​​of C can be 8mm, 8.5mm, 9mm, 9.5mm and 10mm, and the values ​​of D can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm and 12mm.

[0056] It is worth mentioning that, since the first end of the screw shaft 30 needs to pass through the first cooling chamber 12, and the second end of the screw shaft 30 is arranged in the first cooling chamber 12, when the first cooling chamber 12 and the second cooling chamber 22 have the same volume, the heat dissipation capacity of the second end of the screw shaft 30 is higher than the heat dissipation capacity of the first end of the screw shaft 30. In order to improve the heat dissipation capacity of the first end of the screw shaft 30, it is necessary to set the first flange 1021 on the first bearing seat 101, and the size of the second flange 1022 should be larger than the size of the third flange 2021, that is, the volume of the redundant space for storing the refrigerant in the first groove 121 should be larger than the volume of the redundant space for storing the refrigerant in the third groove 221, thereby making the volume of the refrigerant stored in the first groove 121 within a certain period of time larger, ensuring that the refrigerant is fully in contact with the outer surface of the first end of the screw shaft 30, so as to improve the heat dissipation effect of the first end of the screw shaft 30. In addition, in the present embodiment, the first groove 121 and the third groove 221 are both configured as circular grooves to increase the redundant volumes of the first groove 121 and the third groove 221 .

[0057] Furthermore, the screw mechanism also includes an oil tank (not shown in the figure), which is connected to the first channel 11 through an oil pipeline (not shown in the figure), and a temperature control component (not shown in the figure) is provided on the oil tank, which is used to adjust the temperature of the oil in the oil tank.

[0058] When the screw mechanism is actually working, the oil tank is connected to the first channel 11 through the oil pipeline, so that the oil can enter the first cooling chamber 12 from the first channel 11. In some embodiments, the oil tank also includes a return pipe (not shown in the figure), which is connected between the second channel 21 and the oil tank, that is, the refrigerant in the second cooling chamber 22 can flow back to the oil tank through the return pipe to achieve the recycling of the oil. In addition, the oil tank also includes a temperature control component, which is used to adjust the temperature of the oil. When the screw shaft 30 works at a high speed, the screw shaft 30, the first bearing assembly 40 and the second bearing assembly 50 generate too much heat. At this time, the temperature control component can reduce the temperature of the oil, thereby improving the heat dissipation effect of the screw mechanism. On the other hand, when the oil enters the oil tank through the loop pipeline, the temperature of the oil flowing into the oil tank is high. The temperature control component can adjust the temperature of the oil to avoid the oil circulating into the first cooling chamber 12 from being too high. In some embodiments, the screw mechanism further includes a controller and a speed detector, the speed detector is disposed on the screw shaft 30, the speed detector is used to detect the speed of the screw shaft 30, the controller is electrically connected to the speed detector and the temperature control component, and when the speed detector detects that the speed of the screw is higher than a predetermined value, the controller controls the temperature control component to reduce the temperature of the oil in the oil tank. In addition, quick-change joints are installed on both the first channel 11 and the second channel 21, the oil pipeline is connected between the quick-change joint on the first channel 11 and the oil tank, and the return pipeline is connected between the quick-change joint on the second channel 21 and the oil tank.

[0059] Further, along the axial direction of the screw, the first bearing assembly 40 is provided with a first stopper 81 and a first locking assembly 60 on both sides thereof, the first stopper 81 abuts against the side wall of the first cooling chamber 12 close to the second cooling chamber 22, the first locking assembly 60 is provided on the side of the first bearing assembly 40 away from the first stopper 81, and is sleeved on the outer periphery of the screw shaft 30, the first locking assembly 60 is used to abut against the inner ring of the first bearing assembly, so that the outer ring of the first bearing assembly abuts against the first stopper 81. 1; along the axial direction of the screw, the second stopper 82 and the second locking assembly 70 are respectively provided on both sides of the second bearing assembly 50, the second stopper 82 abuts against the side wall of the second cooling chamber 22 close to the first cooling chamber 12, the second locking assembly 70 is arranged on the side of the second bearing assembly 50 away from the second stopper 82, and is sleeved on the outer periphery of the screw shaft 30, the second locking assembly 70 is used to abut against the inner ring of the second bearing group, so that the outer ring of the second bearing group abuts against the second stopper 82.

[0060] Specifically, when the screw shaft 30 rotates, after the screw shaft 30 is heated, the screw shaft 30 will extend toward both ends along its own axial direction, thereby causing the outer peripheral surface of the screw to be easily deformed, thereby reducing the accuracy of the screw. In this embodiment, since the first locking assembly 60 is pressed against the inner ring of the first bearing assembly 40, and the outer ring of the first bearing assembly 40 is stopped on the first locking member 61; at the same time, the first locking member 61 is pressed against the first bearing seat 101. Since the first bearing seat 101 is usually fixed on a predetermined device, according to the reaction force, the first bearing seat 101 will eventually apply an external force along the direction from the second fixing portion 20 to the first fixing portion 10 to the screw shaft 30, so that the first end of the screw shaft 30 is extended and subjected to the external force, thereby preventing the outer peripheral surface of the screw shaft 30 from being deformed. Similarly, the second bearing seat 201 will apply an external force along the direction from the first fixed portion 10 to the second fixed portion 20 to the screw shaft 30, so that the second end of the screw shaft 30 is extended and then subjected to the external force to avoid deformation of the outer peripheral surface of the screw shaft 30. It is worth mentioning that in this embodiment, the first stopper 81 is used to prevent the outer ring of the first bearing assembly 40 from directly abutting against the first bearing seat 101, so as to avoid the uneven contact surface between the first bearing seat 101 and the first bearing assembly 40, resulting in damage to the first bearing assembly 40. Similarly, the second stopper 82 is also used to prevent the uneven contact surface between the second bearing assembly 50 and the second bearing seat 201, resulting in excessive force on a part of the second bearing assembly 50, thereby causing damage to the second bearing assembly 50.

[0061] Furthermore, the first locking assembly 60 includes a first locking member 61 and a third stop member 62, the third stop member 62 is arranged between the first locking member 61 and the first bearing assembly 40, and the first locking member 61 can move along the axial direction so that the third stop member 62 stops against the inner ring of the first bearing assembly 40; the second locking assembly 70 includes a second locking member 71 and a fourth stop member, the fourth stop member is arranged between the second locking member 71 and the second bearing assembly 50, and the second locking member 71 can move along the axial direction so that the fourth stop member stops against the inner ring of the second bearing assembly 50.

[0062] In this embodiment, the third stopper 62 and the fourth stopper are both sleeved on the outer periphery of the screw shaft 30. When the first locking member 61 is locked, the third stopper 62 abuts against the inner ring of the first bearing assembly 40. Similarly, when the second locking member 71 is locked, the fourth stopper abuts against the inner ring of the second bearing assembly 50. At this time, the reaction force applied by the first bearing seat 101 to the first stopper 81 is finally transmitted between the third stopper 62 and the first locking member 61, and then the first locking member 61 transmits the reaction force to the first end of the screw shaft 30, thereby preventing the first end of the screw shaft 30 from being easily deformed after being heated and stretched. Similarly, the reaction force applied by the second bearing seat 201 to the second stopper 82 is finally transmitted between the third stopper 62 and the first locking member 61, and then the first locking member 61 transmits the reaction force to the second end of the screw shaft 30, thereby preventing the second end of the screw shaft 30 from being easily deformed after being heated and stretched. Of course, in some embodiments, the third stopper 62 and the fourth stopper may not be provided, and the same effect can be achieved by directly abutting the first bearing assembly 40 with the first locking member 61, and directly abutting the first bearing assembly 40 with the second locking member 71. On the other hand, the third stopper 62 abuts against the inner ring of the first rotor assembly, and the first stopper 81 abuts against the outer ring of the first rotor assembly, thereby limiting the first bearing assembly 40. When the first bearing assembly 40 has multiple bearings, the abutting force can reduce the gap between the multiple bearings in the axial direction. Similarly, the second bearing assembly 50 is abutted between the second stopper 82 and the fourth stopper. When the second bearing assembly 50 includes multiple bearings, the gap between the multiple bearings can be reduced.

[0063] As attached Figure 2 As shown, the first bearing assembly 40 includes four bearings, and the four bearings are arranged in sequence along the axial direction of the screw shaft 30. Along the direction from the first fixed part 10 to the second fixed part 20, the first bearing is arranged in series with the second bearing, the second bearing is arranged back to back with the third bearing, and the fourth bearing is arranged in series with the third bearing. The arrangement of the bearings in this embodiment can prevent the screw shaft 30 from moving in the axial direction to a certain extent, that is, when the screw shaft 30 has a tendency to move in the direction from the second fixed part 20 to the first fixed part 10, the third bearing and the fourth bearing will apply a force in the direction from the first fixed part 10 to the second fixed part 20 to the screw shaft 30, thereby preventing the screw shaft 30 from moving in the direction from the second fixed part 20 to the first fixed part 10. When the screw shaft 30 has a tendency to move in the direction from the first fixed part 10 to the second fixed part 20, the first bearing and the second bearing will apply a force in the direction from the second fixed part 20 to the first fixed part 10 to the screw shaft 30, thereby preventing the screw shaft 30 from moving in the axial direction.

[0064] As attached Figure 3As shown, the second bearing assembly 50 includes three bearings, which are arranged in sequence along the direction from the first fixed part 10 to the second fixed part 20, and the first bearing is arranged in series with the second bearing, and the second bearing is arranged face to face with the third bearing. Similarly, when the second end of the screw shaft 30 has a tendency to move in the direction from the second fixed part 20 to the first fixed part 10, the first bearing and the second bearing will apply a force in the direction from the first fixed part 10 to the second fixed part 20 to the screw shaft 30 to prevent the screw shaft 30 from moving in the direction from the second fixed part 20 to the first fixed part 10. When the second end of the screw shaft 30 has a tendency to move in the direction from the first fixed part 10 to the second fixed part 20, the third fixed part will apply an opposite force to the screw shaft 30, thereby preventing the second end of the screw shaft 30 from moving. It is understandable that since the first cooling chamber 12 is larger and the second cooling chamber 22 is smaller, the number of bearings in the first bearing assembly 40 should be greater than the number of bearings in the second bearing assembly 50, thereby improving the supporting effect of the first bearing assembly 40 on the screw shaft 30.

[0065] In some embodiments, a first sealing groove 123 is further provided at the bottom of the second groove 122, and a skeleton oil seal 83 is embedded in the first sealing groove 123. A second sealing groove 223 is provided at the bottom of the fourth groove 222, and a skeleton oil seal 83 is embedded in the second sealing groove 223, thereby preventing the refrigerant from flowing out of the gap between the screw shaft 30 and the second groove 122 or the fourth groove 222.

[0066] On the other hand, the present application also provides a device, which includes the screw mechanism in the above embodiment, and thus the device includes all the technical effects of the screw mechanism in the above embodiment. Since the technical effects of the screw mechanism have been described in detail above, they will not be repeated here.

[0067] In summary, the present application provides a screw mechanism and a device, which includes a screw mechanism, and the screw mechanism includes a first fixed part 10, a second fixed part 20, a screw shaft 30, a first rotor assembly and a second rotor assembly. By setting a first cooling chamber 12 on the first fixed part 10, a second cooling chamber 22 on the second fixed part 20, and a cooling channel 31 on the screw shaft 30, the refrigerant passes through the first cooling chamber 12, the cooling channel 31 and the second cooling chamber 22 in turn, and cools the first rotor assembly, the screw shaft 30 and the second rotor assembly, thereby avoiding excessive temperature of the screw shaft 30, the first rotor assembly or the second rotor assembly, which leads to reduced accuracy of the screw mechanism. In addition, in the present application, there is a gap between the first groove 121 and the first locking assembly 60, and there is a gap between the second groove 122 and the second locking assembly 70, so that the refrigerant entering the first groove 121 from the first channel 11 can be stored in the first groove 121 for a certain period of time, and the refrigerant entering the second groove 122 from the cooling channel 31 can be stored in the second groove 122 for a certain period of time, so as to improve the cooling effect of the refrigerant on the first rotor assembly, the second rotor assembly and the screw shaft 30. On the other hand, the present application is also provided with an oil tank, and a temperature control component is provided on the oil tank. The refrigerant uses oil, which can dissipate heat to the screw mechanism on the one hand, and lubricate the first bearing assembly 40 and the second bearing assembly 50 while dissipating heat on the other hand. At the same time, the temperature of the oil can be adjusted by the temperature control component according to the working condition of the screw shaft 30, so as to facilitate the normal operation of the screw shaft 30.

[0068] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0069] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0070] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A screw mechanism, characterized in that: include: A screw shaft (30), wherein a cooling channel (31) is provided on the screw shaft (30), wherein the cooling channel (31) extends along the axial direction of the screw shaft (30), and wherein a first opening (32) is provided at a first end of the screw shaft (30), wherein the first opening (32) is communicated with the cooling channel (31), and wherein a second opening (33) is provided at a second end of the screw shaft (30), wherein the second opening (33) is communicated with the cooling channel (31); a first fixing portion (10), the first fixing portion (10) being arranged at a first end of the screw shaft (30), the first fixing portion (10) being provided with a first cooling chamber (12) and a first channel (11), and the first channel (11) being in communication with the first cooling chamber (12); a second fixing portion (20), the second fixing portion (20) being arranged at the second end of the screw shaft (30), the second fixing portion (20) being provided with a second cooling chamber (22) and a second channel (21), and the second channel (21) being in communication with the second cooling chamber (22); A first bearing assembly (40), wherein the first bearing assembly (40) is sleeved on the screw shaft (30), and the first bearing assembly (40) is located in the first cooling chamber (12); A second bearing assembly (50), wherein the second bearing assembly (50) is sleeved on the screw shaft (30), and the second bearing assembly (50) is located in the second cooling chamber (22); The first end of the screw shaft (30) can rotatably pass through the first cooling chamber (12), the second end of the screw shaft (30) can rotatably pass through the second cooling chamber (22), and the first cooling chamber (12) is connected to the second cooling chamber (22) through the cooling channel (31).

2. The screw mechanism according to claim 1, characterized in that: The minimum outer diameter D1 of the screw shaft (30) and the diameter D2 of the cooling channel (31) satisfy the relationship: 2.25≤D1 / D2≤4.375, wherein D2 satisfies the relationship: 16mm≤D2≤20mm.

3. The screw mechanism according to claim 1, characterized in that: The first fixing portion (10) comprises a first bearing seat (101) and a first end cover assembly (102); the first bearing seat (101) is sealedly connected to the first end cover assembly (102); and a first locking assembly (60) is provided on a side of the first bearing assembly (40) away from the first bearing seat (101) along the axial direction of the screw shaft (30); The first end cover assembly (102) is provided with a first groove (121), the first bearing seat (101) is provided with a second groove (122), the first groove (121) and the second groove (122) are arranged to form the first cooling chamber (12), the first locking assembly (60) is arranged in the first groove (121), and a gap is provided between the first locking assembly (60) and an inner wall surface of the first groove (121), the first channel (11) is connected to the first groove (121), and the first bearing assembly (40) is embedded in the second groove (122).

4. The screw mechanism according to claim 3, characterized in that: The first groove (121) comprises a first circular groove, and along the radial direction of the screw shaft (30), a minimum distance A between the first locking assembly (60) and an inner wall surface of the first circular groove satisfies the relationship: 24 mm ≤ A ≤ 28 mm; and / or, Along the axial direction of the screw shaft (30), the minimum distance B between the first locking assembly (60) and the inner wall surface of the first circular groove satisfies the relationship: 13mm≤B≤17mm.

5. The screw mechanism according to claim 1, characterized in that: The second fixing portion (20) comprises a second bearing seat (201) and a second end cover assembly (202); the second bearing seat (201) is sealedly connected to the second end cover assembly (202); and a second locking assembly (70) is provided on a side of the second bearing assembly (50) away from the second bearing seat (201) along the axial direction of the screw shaft (30); The second end cover assembly (202) is provided with a third groove (221), the second bearing seat (201) is provided with a fourth groove (222), the third groove (221) and the fourth groove (222) are arranged to form the second cooling chamber (22), the second locking assembly (70) is arranged in the third groove (221), and a gap is provided between the second locking assembly (70) and the inner wall surface of the third groove (221), the second channel (21) is communicated with the third groove (221), and the second bearing assembly (50) is embedded in the fourth groove (222).

6. The screw mechanism according to claim 5, characterized in that: The third groove (221) comprises a second circular groove, and along the radial direction of the screw shaft (30), the minimum distance C between the second locking assembly (70) and the inner wall surface of the second circular groove satisfies the relationship: 8mm≤C≤10mm; and / or, Along the axial direction of the screw shaft (30), the minimum distance D between the second locking assembly (70) and the inner wall surface of the second circular groove satisfies the relationship: 8mm≤D≤12mm.

7. The screw mechanism according to any one of claims 1 to 6, characterized in that: The screw mechanism also includes an oil tank, which is connected to the first channel (11) through an oil pipeline. The oil tank is provided with a temperature control component, which is used to adjust the temperature of the oil in the oil tank.

8. The screw mechanism according to any one of claims 1 to 6, characterized in that: Along the axial direction of the screw, a first stopper (81) and a first locking assembly (60) are respectively provided on both sides of the first bearing assembly (40), the first stopper (81) abuts against the side wall of the first cooling chamber (12) close to the second cooling chamber (22), the first locking assembly (60) is arranged on the side of the first bearing assembly (40) away from the first stopper (81), and is sleeved on the outer periphery of the screw shaft (30), the first locking assembly (60) is used to abut against the inner ring of the first bearing assembly, so that the outer ring of the first bearing assembly abuts against the first stopper (81); Along the axial direction of the screw, the second bearing assembly (50) is respectively provided with a second stopper (82) and a second locking assembly (70), the second stopper (82) is abutted against the side wall of the second cooling chamber (22) close to the first cooling chamber (12), the second locking assembly (70) is arranged on the side of the second bearing assembly (50) away from the second stopper (82), and is sleeved on the outer periphery of the screw shaft (30), the second locking assembly (70) is used to abut against the inner ring of the second bearing group so that the outer ring of the second bearing group abuts against the second stopper (82).

9. The screw mechanism according to claim 8, characterized in that: The first locking assembly (60) comprises a first locking member (61) and a third stop member (62), wherein the third stop member (62) is arranged between the first locking member (61) and the first bearing assembly (40), and the first locking member (61) can move along the axial direction so that the third stop member (62) is stopped at the inner ring of the first bearing assembly (40); The second locking assembly (70) comprises a second locking member (71) and a fourth stop member, wherein the fourth stop member is arranged between the second locking member (71) and the second bearing assembly (50), and the second locking member (71) can move along the axial direction so that the fourth stop member stops at the inner ring of the second bearing assembly (50).

10. A device, characterized in that: The device comprises a screw mechanism as claimed in any one of claims 1 to 9.

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