Internal and external integrated bearing seat for three-screw pump

Abstract

The invention discloses an internal and external integrated bearing seat for a three-screw pump, and belongs to the technical field of bearing seats, connecting flanges are fixedly connected to the two ends of a bearing seat body, and a plurality of connecting holes are formed in the connecting flanges; the bearing seat body is sequentially provided with a bearing seat positioning hole, a first auxiliary shaft seal position, a first shaft seal position, a communicating hole, a second shaft seal position, a second auxiliary shaft seal position and a bearing mounting hole in the axial direction, and the diameter of the bearing mounting hole is the same as that of the bearing seat positioning hole. According to the invention, the diameter of the bearing mounting hole and the diameter of the bearing seat positioning hole are unified in specification, so that dual purposes of a built-in bearing and an external bearing can be realized, the built-in bearing seat and the external bearing seat can be combined into one part, and a plurality of parts are standardized to one part through integrated design, so that the production cost is reduced, and the production efficiency is improved. The number of parts, especially self-made parts, is greatly reduced, so that the pressure can be relieved in the links of planning, production, purchasing, storage and the like.

Description

Technical Field

[0001] This invention relates to the field of bearing housing technology, and specifically to an internally and externally integrated bearing housing for a three-screw pump. Background Technology

[0002] Three-screw pumps utilize the rotation of screws to achieve liquid suction and discharge. The middle screw is the driving screw, driven by a prime mover, while the two outer screws are driven screws, rotating in the opposite direction to the driving screw. Due to the meshing of the screws and the fit between the screws and the inner wall of the bushing, a sealed space is continuously formed at the suction port and transported to the discharge port, gradually increasing the pressure of the transported liquid to form a continuous, stable, axially moving pressurized liquid. With its wide pressure and flow range, broad range of transported liquid viscosity, and uniform flow, it is widely used in various fields, including fuel supply in heating equipment and loading high-viscosity fluids in the food industry.

[0003] Because three-screw pumps have a wide range of applications, their bearing housings are typically categorized into two main types based on whether they can be lubricated by the conveying medium: internal bearing housings and external bearing housings. For internal bearing housings, the bearing is placed at the end closest to the conveying medium. The product's sealing system consists of a front cover, an internal bearing housing (including an oil drain plug), a sealing gland, an oil collection chamber, and an internal shaft seal. The conveying medium directly lubricates the bearing, resulting in a simple structure that eliminates the need for additional lubrication equipment. For external bearing housings, the bearing is placed at the end furthest from the conveying medium. The sealing system consists of a front cover, an external bearing housing (including an oil drain plug), an auxiliary seal, and an external shaft seal. The bearing does not contact the conveying medium and is lubricated by grease.

[0004] However, in the existing technology, the two bearing installation methods use two different sets of component combinations, which increases the number of related components. However, the internal and external installation methods of the product bearings are determined according to the operating conditions, which are uncertain. Therefore, in order to meet the product delivery requirements, the production and storage of related components will be increased, which will also occupy a lot of funds and inventory. This poses a challenge to the planning, procurement, production and storage of components, especially to the multi-variety, small-batch production mode. Therefore, in order to reduce the number of parts, an internal and external integrated bearing housing for a three-screw pump is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an internal and external integrated bearing housing for a three-screw pump, which solves the technical problem in the prior art where two bearing installation methods use two different sets of component combinations, resulting in an excessive number of related components and inconvenience for production and storage.

[0006] The objective of this invention can be achieved through the following technical solutions: An integrated bearing housing with internal and external mounting for a three-screw pump includes a bearing housing body and a connecting flange, wherein: Both ends of the bearing housing body are fixedly connected to connecting flanges, and the connecting flanges have multiple connecting holes; The bearing housing body is provided with a bearing housing positioning hole, a first auxiliary shaft seal, a first shaft seal, a connecting hole, a second shaft seal, a second auxiliary shaft seal, and a bearing mounting hole in sequence along the axial direction. The diameters d3 and d6 of the first shaft seal are both larger than the diameter of the connecting hole. The diameter d2 of the first auxiliary shaft seal is larger than the diameter d3 of the first shaft seal. The diameter d1 of the bearing housing positioning hole is larger than the diameter d2 of the first auxiliary shaft seal. The diameter d5 of the second auxiliary shaft seal is larger than the diameter d6 of the second shaft seal. The diameter d4 of the bearing mounting hole is larger than the diameter d5 of the second auxiliary shaft seal. The diameter d4 of the bearing mounting hole is the same as the diameter d1 of the bearing housing positioning hole.

[0007] The present invention provides an internal and external integrated bearing housing for a three-screw pump, which, compared with the prior art, has the following beneficial effects, but is not limited to: By standardizing the diameter of the bearing mounting hole with that of the bearing housing positioning hole, both built-in and external bearings can be installed within the bearing mounting hole and positioned in conjunction with the end cover. The integrated bearing housing allows for the dual use of both built-in and external bearings, combining the two into a single component. Due to the built-in auxiliary shaft seal, the sealing gland component in the existing built-in bearing housing structure can be eliminated. Through integrated design, multiple components are standardized into a single part, significantly reducing the number of components, especially self-made components. This greatly alleviates pressure in planning, production, procurement, and warehousing.

[0008] Furthermore, the two connecting flanges have the same diameter, i.e., D1=D2, and the diameter and position of the connecting holes on the connecting flanges are the same.

[0009] Furthermore, the bearing housing body is provided with a first oil drain hole and a second oil drain hole. The first oil drain hole is radially connected from the outer side wall of the bearing housing body to the first auxiliary shaft seal, and the second oil drain hole is radially connected from the outer side wall of the bearing housing body to the second auxiliary shaft seal.

[0010] Furthermore, the bearing housing body is provided with a first oil return hole and a second oil return hole. The first oil return hole is connected to the first auxiliary shaft seal from the end face of one connecting flange of the bearing housing body, and the second oil return hole is connected to the second auxiliary shaft seal from the end face of the other connecting flange of the bearing housing body. The side wall of the bearing housing body is also provided with a first oil return support hole and a second oil return support hole. The first oil return support hole is connected to the first oil return hole, and the second oil return support hole is connected to the second oil return hole.

[0011] Furthermore, the first and second oil unloading holes have the same specifications, i.e., M5=M6.

[0012] Furthermore, the specifications of the first oil return hole are the same as those of the second oil return hole, and the specifications of the first oil return branch hole are the same as those of the second oil return branch hole, i.e., M1=M2, M3=M4.

[0013] Furthermore, the specifications of the first oil return hole are the same as those of the first oil return branch hole, and the specifications of the first oil discharge hole are the same as those of the first oil return hole, i.e., M1=M3, M3=M5.

[0014] Furthermore, the inner wall of the first auxiliary shaft seal is provided with a first retaining ring groove, the inner wall of the bearing mounting hole is provided with a second retaining ring groove, and the diameter d2 of the first auxiliary shaft seal is the same as the diameter d5 of the second auxiliary shaft seal.

[0015] Furthermore, the length L4 of the bearing mounting hole is equal to the sum of the length L1 of the bearing housing positioning hole and the bearing width B1, that is, L4 = L1 + B1.

[0016] Furthermore, the diameter d3 of the first shaft seal is the same as the diameter d6 of the second shaft seal, and the length L3 of the first shaft seal is the same as the length L6 of the second shaft seal, that is, d3=d6 and L3=L6. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 This is a front view cross-sectional view of the internal and external integrated bearing housing for a three-screw pump according to the present invention. Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at point AA; Figure 3 This is a half-sectional view of the isometric structure of an internal and external integrated bearing housing for a three-screw pump according to the present invention. Figure 4 This is a schematic diagram of the built-in bearing installation structure of an internal and external integrated bearing housing for a three-screw pump according to the present invention. Figure 5 This is a schematic diagram of the external bearing mounting structure of an internal and external integrated bearing housing for a three-screw pump according to the present invention. Figure 6 This is a schematic diagram of the installation structure of the built-in bearing housing in the prior art; Figure 7 This is a schematic diagram of the existing external bearing housing installation structure.

[0019] In the diagram: 1-End cap, 2-Inner and outer integrated bearing housing, 3.1-Built-in bearing, 3.2-Outer bearing, 4-Main shaft seal, 5.1-Built-in auxiliary shaft seal, 5.2-Outer auxiliary shaft seal, 6.1-Built-in shaft retaining ring, 6.2-Outer shaft retaining ring, 7.1-Built-in auxiliary retaining ring, 7.2-Outer bearing retaining ring, 8-Outer drain plug, 9-Built-in drain plug, 10-Return plug, 11.1-Sealing plug, 11.2-Oil cup, 12-Plug plug, 13-Drive screw, 2 1-Bearing housing body, 22-Connecting flange, 201-Bearing housing positioning hole, 202-First auxiliary shaft seal, 203-First shaft seal, 204-Connecting hole, 205-Second shaft seal, 206-Second auxiliary shaft seal, 207-Bearing mounting hole, 208-First retaining ring groove, 209-Second retaining ring groove, 210-First oil drain hole, 211-Second oil drain hole, 212-First oil return hole, 213-First oil return support hole, 214-Second oil return hole, 215-Second oil return support hole, 216-Anti-rotation screw hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0025] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Please see Figure 1-7 As shown, the present invention is an internally and externally integrated bearing housing for a three-screw pump, comprising a bearing housing body 21 and a connecting flange 22, wherein: Both ends of the bearing housing body 21 are fixedly connected to connecting flanges 22, and the connecting flanges 22 have multiple connecting holes; The bearing housing body 21 has, along the axial direction, a bearing housing positioning hole 201, a first auxiliary shaft seal 202, a first shaft seal 203, a connecting hole 204, a second shaft seal 205, a second auxiliary shaft seal 206, and a bearing mounting hole 207. The diameter d3 of the first shaft seal 203 and the diameter d6 of the second shaft seal 205 are both larger than the diameter of the connecting hole 204. The diameter d2 of the first auxiliary shaft seal 202 is larger than the diameter d3 of the first shaft seal 203. The diameter d1 of the bearing housing positioning hole 201 is larger than the diameter d2 of the first auxiliary shaft seal 202. The diameter d5 of the second auxiliary shaft seal 206 is larger than the diameter d6 of the second shaft seal 205. The diameter d4 of the bearing mounting hole 207 is larger than the diameter d5 of the second auxiliary shaft seal 206. The diameter d4 of the bearing mounting hole 207 is the same as the diameter d1 of the bearing housing positioning hole 201.

[0027] In this embodiment, by unifying the diameter of the bearing mounting hole 207 with the diameter of the bearing seat positioning hole 201, it is possible to install the built-in bearing 3.1 and the external bearing 3.2 in the bearing mounting hole 207 and position them in conjunction with the end cover 1. When the internal and external integrated bearing housing 2 is used to install the built-in bearing 3.1, the built-in bearing 3.1 is installed in the bearing mounting hole 207, the main shaft seal 4 is installed on the second shaft seal position 205, the bearing mounting hole 207 is matched and positioned with the end cover 1, and then the built-in auxiliary shaft seal 5.1 is installed on the first auxiliary shaft seal position 202. The positioning and installation of the built-in bearing 3.1, the main shaft seal 4 and the built-in auxiliary shaft seal 5.1 can be achieved using existing technology.

[0028] When the external bearing 3.2 is installed on the integrated bearing housing 2, i.e., for the external bearing housing, the main shaft seal 4 is installed on the first shaft seal position 203, and then the bearing housing positioning hole 201 is positioned in conjunction with the end cover 1. Then, the external auxiliary shaft seal 5.2 is installed on the second auxiliary shaft seal position 206, and then the external bearing 3.2 is installed in the bearing mounting hole 207. The positioning and installation of the external bearing 3.2, the main shaft seal 4, and the external auxiliary shaft seal 5.2 are achieved using existing technology.

[0029] The internal and external integrated bearing housing 2 can be used for both internal bearing 3.1 and external bearing 3.2. When using it, it should be noted that the internal bearing 3.1 and external bearing 3.2 need to be designed with the same specifications. This way, the internal bearing housing and external bearing housing can be combined into one part. Due to the built-in auxiliary shaft seal 5.1, the sealing cover part in the existing internal bearing housing structure can be eliminated.

[0030] Optionally, please refer to Figure 1-5 As shown, the two connecting flanges 22 have the same diameter, i.e., D1=D2, and the diameter and position of the connecting holes on the connecting flanges 22 are the same.

[0031] In this embodiment, by standardizing the specifications of the connecting flange 22, the installation method is exactly the same when used for both built-in and external bearing housings, avoiding different installation parts. This ensures that whether used for built-in or external bearing housings, there are no leftover connecting parts for the connecting flange 22, allowing for full utilization and reducing storage pressure.

[0032] Optionally, please refer to Figure 1-7 As shown, the bearing housing body 21 is provided with a first oil drain hole 210 and a second oil drain hole 211. The first oil drain hole 210 is radially connected to the first auxiliary shaft seal 202 from the outer side wall of the bearing housing body 21, and the second oil drain hole 211 is radially connected to the second auxiliary shaft seal 206 from the outer side wall of the bearing housing body 21.

[0033] In this embodiment, when in use, it is necessary to install a built-in drain plug 9 in the first drain hole 210 and an external drain plug 8 in the second drain hole 211. When used in a built-in bearing housing, the first auxiliary shaft seal position 202 and the first shaft seal position 203 have a large space, which can serve as an oil collection chamber, and oil can be discharged through the first oil discharge hole 210 connected to the first auxiliary shaft seal position 202, so that the medium leaking from the main shaft seal 4 can be discharged from the first oil discharge hole 210 to the outside of the product. When used in an external bearing housing, the second auxiliary shaft seal position 206 and the second shaft seal position 205 have a large space, which can serve as an oil collection chamber. Oil can be discharged through the second oil drain hole 211 connected to the second auxiliary shaft seal position 206, so that the medium leaking from the main shaft seal 4 can be discharged from the second oil drain hole 211 to the outside of the product.

[0034] The oil collection chamber component in the existing built-in bearing structure can be eliminated, while retaining the oil unloading function.

[0035] Optionally, please refer to Figure 1-7 As shown, the bearing housing body 21 is provided with a first oil return hole 212 and a second oil return hole 214. The first oil return hole 212 is connected to the first auxiliary shaft seal 202 from the end face of one connecting flange 22 of the bearing housing body. The second oil return hole 214 is connected to the second auxiliary shaft seal 206 from the end face of the other connecting flange 22 of the bearing housing body. The side wall of the bearing housing body 21 is also provided with a first oil return support hole 213 and a second oil return support hole 215. The first oil return support hole 213 is connected to the first oil return hole 212, and the second oil return support hole 215 is connected to the second oil return hole 214.

[0036] In this embodiment, when used for an internal bearing housing, an oil return plug 10 is installed at the second oil return port, the second oil return hole 214 is aligned with the corresponding hole of the end cap 1, a sealing plug 11.1 is installed at the first oil return port, and a plug plug 12 is installed at the first oil return hole 212, so as to realize the oil return function by using the second oil return hole 214. When used in an external bearing housing, an oil return plug 10 is installed at the first oil return port, an oil cup 11.2 is installed at the second oil return port, and a plug plug 12 is installed at the first oil return hole 212 to realize the oil return function using the second oil return hole 215.

[0037] The first oil return hole 212 communicates with the first auxiliary shaft seal 202, and the second oil return hole 214 communicates with the second auxiliary shaft seal 206, which enables oil return to the main shaft seal 4, thus retaining the oil return function.

[0038] Optionally, please refer to Figure 1-7 As shown, the first oil discharge hole 210 and the second oil discharge hole 211 have the same specifications, that is, M5=M6; This allows the built-in drain plug 9 and the external drain plug 8 to have the same structure, increasing versatility and reducing the number of parts.

[0039] As a preferred embodiment, the specifications of the first oil return hole 212 are the same as those of the second oil return hole 214, and the specifications of the first oil return branch hole 213 are the same as those of the second oil return branch hole 215, that is, M1=M2, M3=M4. When used in an external bearing housing, the oil return plug 10 installed in the second oil return port can be replaced with the first oil return port, and the plug plug 12 installed in the first oil return hole 212 can be replaced with the second oil return hole 214. Only the oil cup 11.2 needs to be installed in the second oil return port. Only the oil cup 11.2 and the plug plug 11.1 need to be replaced. All other parts are interchangeable, which further reduces the types of parts and reduces the problem of idle parts when changing the usage mode, and reduces the difficulty of warehousing and storage.

[0040] In a preferred embodiment, the specifications of the first oil return hole 212 are the same as those of the first oil return branch hole 213, and the specifications of the first oil discharge hole 210 are the same as those of the first oil return hole 212, i.e., M1=M3, M3=M5. In other words, the specifications of the first oil discharge hole 210, the second oil discharge hole 211, the first oil return hole 212, the second oil return hole 214, the first oil return branch hole 213, and the second oil return branch hole 215 are all the same, i.e., M1=M2=M3=M4=M5=M6.

[0041] By further standardizing the specifications, the specifications of return oil plug 10, sealing plug 11.1, built-in drain plug 9, and external unloading plug 8 can be unified without further subdivision, improving versatility. When used in large quantities, only a small number of plugs need to be stored for backup and adaptive replacement, greatly reducing the types of parts and storage pressure. Only the oil cup 11.2 needs to be stored separately.

[0042] Optionally, please refer to Figure 1-7 As shown, the inner wall of the first auxiliary shaft seal 202 is provided with a first retaining ring groove 208, the inner wall of the bearing mounting hole 207 is provided with a second retaining ring groove 209, and the diameter d2 of the first auxiliary shaft seal 202 is the same as the diameter d5 of the second auxiliary shaft seal 206.

[0043] In this embodiment, a preferred positioning method for the auxiliary shaft seal and bearing is provided. Since the diameter of the first auxiliary shaft seal position 202 is the same as the diameter of the second auxiliary shaft seal position 206, the built-in auxiliary shaft seal 5.1 and the external auxiliary shaft seal 5.2 can be used interchangeably. There is no need to store auxiliary oil seals separately; only a small number need to be kept for backup. When used in a built-in bearing housing, the built-in auxiliary shaft seal 5.1 is located at the first auxiliary shaft seal position 202. At this time, the axial positioning of the built-in auxiliary shaft seal 5.1 can be achieved by using the positioning step of the drive screw 13, and the axial limiting of the built-in auxiliary shaft seal 5.1 can be achieved by using the first retaining ring groove 208 to install the built-in auxiliary retaining ring 7.1. The axial positioning of the built-in bearing 3.1 can be achieved by using the drive screw 13 to install the built-in shaft retaining ring 6.1, and the axial limiting of the built-in bearing 3.1 can be achieved by using the end cover 1.

[0044] When used in an external bearing housing, the external auxiliary shaft seal 5.2 is located in the second auxiliary shaft seal position 206. The auxiliary shaft seal positioning boss can be set in the second auxiliary shaft seal position 206 to achieve axial positioning. The external bearing 3.2 is axially positioned by the positioning step of the drive screw 13. The external bearing retaining ring 7.2 is installed in the second retaining ring groove 209 to limit the external bearing 3.2. If necessary, an external shaft retaining ring 6.2 can be installed on the drive screw 13 to further limit the external bearing 3.2.

[0045] It should be noted that when used in an external bearing housing, the second oil return hole 214 can be connected between the external auxiliary shaft seal 5.2 and the external bearing 3.2. In this case, since there is almost no pressure on the side of the external auxiliary shaft seal 5.2 close to the main shaft seal 4, the oil pressure on the side of the external auxiliary shaft seal 5.2 away from the main shaft seal 4 can be used to press and limit the external auxiliary shaft seal 5.2. In addition, if necessary, an additional retaining ring groove can be set on the side of the external auxiliary shaft seal 5.2 that is closer to the main shaft seal and a retaining ring can be installed to strengthen the limiting and ensure stability.

[0046] Optionally, please refer to Figure 1-7 As shown, the length L4 of the bearing mounting hole 207 is equal to the sum of the length L1 of the bearing housing positioning hole 201 and the bearing width B1, that is, L4 = L1 + B1.

[0047] In this embodiment, the length of the positioning boss on the end cover 1 can be reasonably set so that it can be directly pressed against the built-in bearing 3.1 to act as an axial limit, further reducing the number of parts.

[0048] Optionally, please refer to Figure 1-7 As shown, the diameter d3 of the first shaft seal 203 is the same as the diameter d6 of the second shaft seal 205, and the length L3 of the first shaft seal 203 is the same as the length L6 of the second shaft seal 205, that is, d3=d6, L3=L6.

[0049] In this embodiment, the specifications of the main spindle seal 4 can be standardized, and the positioning of the main spindle seal 4 can be achieved by using the boss formed by the connecting hole 204. At this time, a portion of the main spindle seal 4 extends into the connecting hole 204. Therefore, an anti-rotation screw hole 216 that extends to the outer wall of the bearing seat body 21 can be opened at the location of the connecting hole 204. The main spindle seal 4 can be locked by a square brick screw to achieve the limitation and anti-rotation of the main spindle seal 4.

[0050] By integrating the design of related components, multiple components are standardized into one component, which greatly reduces the number of components, especially self-made components. The model of the main spindle seal 4 was standardized, and the same type of standard parts used in this combination can be designed into one specification, which simplifies the design requirements to a certain extent. Based on this, the consistency of parts greatly reduces pressure and capital occupation in planning, production, procurement, and warehousing. At the same time, the increase in batch size will reduce the corresponding cost requirements in procurement and production.

[0051] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A type of integrated bearing housing with internal and external components for a three-screw pump, characterized in that, Includes a bearing housing body (21) and a connecting flange (22), wherein: Both ends of the bearing housing body (21) are fixedly connected to connecting flanges (22), and the connecting flanges (22) have multiple connecting holes; The bearing housing body (21) is provided with a bearing housing positioning hole (201), a first auxiliary shaft seal (202), a first shaft seal (203), a connecting hole (204), a second shaft seal (205), a second auxiliary shaft seal (206), and a bearing mounting hole (207) in sequence along the axial direction. The diameter d3 of the first shaft seal (203) and the diameter d6 of the second shaft seal (205) are both larger than the diameter of the connecting hole (204). The diameter d2 of the first auxiliary shaft seal (202) is larger than the diameter of the connecting hole (204). The diameter d3 of the first shaft seal (203) is greater than the diameter d1 of the bearing housing positioning hole (201), the diameter d2 of the first auxiliary shaft seal (202) is greater than the diameter d5 of the second auxiliary shaft seal (206) is greater than the diameter d6 of the second shaft seal (205), the diameter d4 of the bearing mounting hole (207) is greater than the diameter d5 of the second auxiliary shaft seal (206), and the diameter d4 of the bearing mounting hole (207) is the same as the diameter d1 of the bearing housing positioning hole (201).

2. The internal and external integrated bearing housing for a three-screw pump according to claim 1, characterized in that, The two connecting flanges (22) have the same diameter, i.e., D1=D2, and the diameter and position of the connecting holes on the connecting flanges (22) are the same.

3. The internal and external integrated bearing housing for a three-screw pump according to claim 1, characterized in that, The bearing housing body (21) is provided with a first oil drain hole (210) and a second oil drain hole (211). The first oil drain hole (210) is radially connected from the outer side wall of the bearing housing body (21) to the first auxiliary shaft seal (202), and the second oil drain hole (211) is radially connected from the outer side wall of the bearing housing body (21) to the second auxiliary shaft seal (206).

4. The internal and external integrated bearing housing for a three-screw pump according to claim 3, characterized in that... The bearing housing body (21) is provided with a first oil return hole (212) and a second oil return hole (214). The first oil return hole (212) is connected to the first auxiliary shaft seal (202) through the end face of one connecting flange (22) of the bearing housing body. The second oil return hole (214) is connected to the second auxiliary shaft seal (206) through the end face of the other connecting flange (22) of the bearing housing body. The side wall of the bearing housing body (21) is also provided with a first oil return support hole (213) and a second oil return support hole (215). The first oil return support hole (213) is connected to the first oil return hole (212), and the second oil return support hole (215) is connected to the second oil return hole (214).

5. The internal and external integrated bearing housing for a three-screw pump according to claim 4, characterized in that... The first oil discharge hole (210) and the second oil discharge hole (211) have the same specifications, that is, M5=M6.

6. The internal and external integrated bearing housing for a three-screw pump according to claim 5, characterized in that... The specifications of the first oil return hole (212) are the same as those of the second oil return hole (214), and the specifications of the first oil return branch hole (213) are the same as those of the second oil return branch hole (215), i.e., M1=M2, M3=M4.

7. The internal and external integrated bearing housing for a three-screw pump according to claim 6, characterized in that... The specifications of the first oil return hole (212) are the same as those of the first oil return branch hole (213), and the specifications of the first oil discharge hole (210) are the same as those of the first oil return hole (212), i.e., M1=M3, M3=M5.

8. The internal and external integrated bearing housing for a three-screw pump according to claim 1, characterized in that, The inner wall of the first auxiliary shaft seal (202) is provided with a first retaining ring groove (208), and the inner wall of the bearing mounting hole (207) is provided with a second retaining ring groove (209). The diameter d2 of the first auxiliary shaft seal (202) is the same as the diameter d5 of the second auxiliary shaft seal (206).

9. The internal and external integrated bearing housing for a three-screw pump according to claim 1, characterized in that, The length L4 of the bearing mounting hole (207) is equal to the sum of the length L1 of the bearing seat positioning hole (201) and the bearing width B1, that is, L4 = L1 + B1.

10. The internal and external integrated bearing housing for a three-screw pump according to claim 1, characterized in that, The diameter d3 of the first shaft seal (203) is the same as the diameter d6 of the second shaft seal (205), and the length L3 of the first shaft seal (203) is the same as the length L6 of the second shaft seal (205), that is, d3=d6, L3=L6.

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