A seal structure for replacing a skeleton oil seal

Abstract

The utility model belongs to the brine pump technical field discloses a sealed structure of replacement framework oil seal for the radial clearance seal between pump spindle and bearing chamber, prevents the grease from leaking out, including seal ring group and end cover, seal ring group coaxial fixed connection is established on pump spindle, prevents the oil stain from flowing outward along pump spindle, end cover is fixedly connected on the outside wall of bearing chamber shaft hole through screw, and the end cover carries out closed protection to the outer wall surface of seal ring group, the sealed structure of replacement framework oil seal of the utility model adopts the seal of seal ring group along with the rotation of the shaft, reduces the rotation resistance, and pump spindle will not be abraded.

Description

Technical Field

[0001] This utility model relates to the field of brine pump technology, and in particular to a sealing structure that replaces the skeleton oil seal. Background Technology

[0002] Centrifugal brine pumps are specialized industrial pumps designed for transporting natural brine, salt mine brine, or industrial brine. They are primarily used in salt chemical industry, mining, geothermal energy, and lithium / bromine extraction. Due to the complex composition of brine, containing high concentrations of salts, corrosive elements, and solid particles, brine pumps must possess strong corrosion resistance, wear resistance, and anti-crystallization properties.

[0003] In existing centrifugal brine pumps, the pump shaft is horizontally mounted through a bearing housing. A skeleton oil seal is required at the end hole of the pump shaft within the bearing housing to prevent lubricant leakage and the ingress of external moisture and dust. However, the inner lip of the skeleton oil seal tightly contacts the rotating pump shaft, and this rotational sliding friction increases the rotational resistance of the pump shaft, thus increasing wear.

[0004] Therefore, it is necessary to develop a sealing structure to replace the skeleton oil seal to address the above-mentioned defects. Utility Model Content

[0005] The purpose of this invention is to provide a sealing structure that can replace the skeleton oil seal. It uses a sealing ring assembly that rotates with the shaft to achieve the seal, which reduces rotational resistance and prevents wear on the pump shaft.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This utility model provides a sealing structure that replaces the skeleton oil seal. It is used to seal the radial gap between the pump spindle and the bearing chamber to prevent grease leakage. It includes a sealing ring assembly and an end cap. The sealing ring assembly is coaxially fixedly connected to the pump spindle to prevent oil stains from flowing outward along the pump spindle. The end cap is fixedly connected to the outer wall of the bearing chamber shaft hole by screws, and the end cap provides sealing protection to the outer wall surface of the sealing ring assembly.

[0007] Furthermore, the sealing ring assembly includes a U-shaped shell and a sealing gasket. The U-shaped shell is annular in shape with a U-shaped cross-section. The inner wall of the U-shaped shell is interference-fitted onto the pump main shaft, and the opening of the U-shaped shell faces the bearing chamber cavity. The sealing gasket is adhered to the opening of the U-shaped shell, and the inner lip of the sealing gasket protrudes from the inner wall of the U-shaped shell and makes sealing contact with the outer wall of the pump main shaft.

[0008] Furthermore, the sealing ring assembly also includes an elastic hoop ring, which is coaxially disposed inside the opening of the U-shaped shell, and the elastic hoop ring clamps the inner lip of the sealing gasket to the inner sidewall of the U-shaped shell.

[0009] Furthermore, the sealing ring assembly also includes a spacer, the annular spacer being coaxially disposed within the opening of the U-shaped shell, the spacer being placed between the vertical side wall of the sealing gasket and the inner end face of the elastic hoop; the outer side wall edge of the U-shaped shell is provided with a bent tongue, the tongue preventing contact with the outer end face of the elastic hoop.

[0010] Furthermore, the sealing gasket is specifically made of fluororubber material, and the inner lip of the sealing gasket is provided with a sealing ring protruding towards the axis, the sealing ring contacting the outer wall of the pump main shaft.

[0011] Furthermore, a copper sleeve is nested on the inner circular hole surface of the end cap, and the copper sleeve is clearance-fitted with the outer circular wall of the U-shaped shell.

[0012] Furthermore, the inner hole of the copper sleeve is a flared opening, with the larger opening of the flared opening facing the inner side of the bearing chamber.

[0013] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This utility model provides a sealing structure that replaces the skeleton oil seal. It uses a sealing ring assembly coaxially fixed to the pump shaft, which rotates with the shaft to prevent oil from flowing outwards axially. An end cap further seals the outer surface of the sealing ring assembly, reducing the risk of lubricating grease leaking from the outer ring gaps. This novel sealing structure, which replaces the skeleton oil seal, uses a rotating sealing ring assembly, reducing rotational resistance and preventing wear on the pump shaft.

[0014] Furthermore, by designing a U-shaped housing with its opening facing the bearing chamber, overflowing lubricating grease can be contained. The inner lip of the sealing gasket protrudes from the inner wall of the U-shaped housing and seals against the outer wall of the pump shaft, preventing lubricating grease from leaking outwards along the micro-gap between the inner wall of the U-shaped housing and the pump shaft. Adding an elastic retaining ring to tighten the inner lip of the sealing gasket against the inner wall of the U-shaped housing effectively prevents the sealing gasket from folding outwards and deforming. A septum placed between the vertical side wall of the sealing gasket and the inner end face of the elastic retaining ring prevents the sealing gasket from detaching outwards. The presence of a retaining tongue prevents the elastic retaining ring from detaching outwards. The addition of a sealing protrusion ring integrally formed on the inner lip of the sealing gasket creates a stable and reliable annular sealing line, preventing grease leakage along the shaft wall. The addition of a copper sleeve ensures a low coefficient of friction even when in contact with the outer wall of the U-shaped housing, minimizing rotational resistance. By setting the inner hole of the copper sleeve as a flared opening, even if lubricating grease enters the annular gap, it will overflow towards the larger end of the flared opening where the pressure is lower, reducing the occurrence of outward overflow. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 A schematic front view of a brine pump with a sealing structure that replaces the skeleton oil seal according to this utility model; Figure 2 for Figure 1 A magnified schematic diagram of a portion of the central I section; Figure 3 This is a schematic diagram of the cross-sectional structure of the sealing ring assembly in this utility model; Figure 4 This is a front view structural diagram of the sealing ring assembly in this utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Pump main shaft; 2. Pump casing; 3. Bearing housing; 4. Sealing ring assembly; 401. U-shaped shell; 4011. Stop tongue; 402. Sealing gasket; 403. Spacer; 404. Elastic hoop; 5. End cover; 6. Screw; 7. Copper sleeve. Detailed Implementation

[0018] The core of this invention is to provide a sealing structure that can replace the skeleton oil seal. It uses a sealing ring assembly that rotates with the shaft for sealing, which reduces rotational resistance and does not wear the pump shaft.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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 utility model 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 utility model.

[0021] Refer to the attached diagram. Figure 1 A schematic front view of a brine pump with a sealing structure that replaces the skeleton oil seal according to this utility model; Figure 2 for Figure 1 A magnified schematic diagram of a portion of the central I section; Figure 3 This is a schematic diagram of the cross-sectional structure of the sealing ring assembly in this utility model; Figure 4 This is a front view structural diagram of the sealing ring assembly in this utility model.

[0022] In one specific implementation, such as Figures 1-4As shown, the sealing structure of this utility model, which replaces the skeleton oil seal, is used to seal the radial clearance between the pump main shaft 1 and the bearing chamber 3. The bearing chamber 3 contains lubricating grease for lubricating the bearing, and the sealing structure of this utility model can prevent grease leakage. The sealing structure of this utility model includes a sealing ring assembly 4 and an end cap 5. The sealing ring assembly 4 is coaxially fixedly connected to the pump main shaft 1 and rotates with the pump main shaft 1 to prevent oil stains from flowing outward along the pump main shaft 1. The end cap 5 is fixedly connected to the outer wall of the shaft hole of the bearing chamber 3 by screws 6, and the end cap 5 provides sealing protection to the outer wall surface of the sealing ring assembly 4.

[0023] Specifically, such as Figure 2 As shown, screw 6 is an internal hex screw or a hex head screw. Multiple bolt holes are evenly distributed around the circumference of the outer end face of the end cover 5. Screw 6 passes through the bolt holes and is threaded into the bolt hole on the end side wall of the bearing chamber 3.

[0024] By coaxially fixing the sealing ring assembly 4 to the pump main shaft 1, the sealing ring assembly 4 rotates with the pump main shaft 1, preventing oil stains from flowing outwards axially along the pump main shaft 1. The end cover 5 seals and protects the outer wall surface of the sealing ring assembly 4, reducing the risk of lubricating grease overflowing from the outer ring gap. This utility model replaces the skeleton oil seal with a sealing structure that uses a sealing ring assembly that rotates with the shaft, reducing rotational resistance and preventing wear on the pump main shaft.

[0025] In one specific embodiment of this utility model, such as Figure 2 and Figure 3 As shown, the sealing ring assembly 4 includes a U-shaped shell 401 and a sealing gasket 402. The U-shaped shell 401 is annular in shape with a U-shaped cross-section. The inner wall of the U-shaped shell 401 is interference-fitted onto the pump main shaft 1, and the opening of the U-shaped shell 401 faces the inner cavity of the bearing chamber 3. The sealing gasket 402 is adhered and bonded to the opening of the U-shaped shell 401, and the inner lip of the sealing gasket 402 protrudes from the inner wall of the U-shaped shell 401 and makes sealing contact with the outer wall of the pump main shaft 1.

[0026] Specifically, the U-shaped shell 401 is made of high-quality stainless steel.

[0027] By setting a U-shaped housing 401 with its opening facing the inner cavity of the bearing chamber 3, the overflowing lubricating grease can be contained. The inner lip of the sealing gasket 402 protrudes from the inner wall of the U-shaped housing 401 and seals against the outer wall of the pump main shaft 1, which can prevent the lubricating grease from leaking outward along the micro gap between the inner wall of the U-shaped housing 401 and the pump main shaft 1.

[0028] Specifically, such as Figure 3 and Figure 4As shown, the sealing ring assembly 4 also includes an elastic clamping ring 404. The structure of the elastic clamping ring 404 is similar to that of a piston ring and is made of 65Mn steel. The elastic clamping ring 404 is coaxially disposed inside the opening of the U-shaped shell 401, and the elastic clamping ring 404 clamps the inner lip of the sealing gasket 402 to the inner sidewall of the U-shaped shell 401.

[0029] Specifically, such as Figure 3 and Figure 4 As shown, the sealing ring assembly 4 also includes a spacer 403. The annular spacer 403 is coaxially disposed within the opening of the U-shaped shell 401, and is positioned between the vertical side wall of the sealing gasket 402 and the inner end face of the elastic ring 404. The spacer 403 is made of oil-resistant plastic. A bent tongue 4011 is provided on the outer edge of the outer wall of the U-shaped shell 401, which prevents contact with the outer end face of the elastic ring 404.

[0030] Specifically, such as Figure 3 and Figure 4 As shown, there are multiple tongues 4011, which are evenly distributed around the circumference. The base of the tongue 4011 is integrally formed on the outer wall of the U-shaped shell 401, and can be installed and removed by reciprocating bending with pliers.

[0031] By adding an elastic clamping ring 404 to tighten the inner lip of the sealing gasket 402 onto the inner wall of the U-shaped shell 401, the sealing gasket 402 can be effectively prevented from folding and deforming outward. By placing a spacer 403 between the vertical side wall of the sealing gasket 402 and the inner end face of the elastic clamping ring 404, the sealing gasket 402 can be prevented from falling outward. By setting a stop tongue 4011, the elastic clamping ring 404 can be prevented from falling outward.

[0032] In one specific embodiment of this utility model, such as Figure 3 As shown, the sealing gasket 402 is specifically made of fluororubber material. The inner lip of the sealing gasket 402 is provided with a sealing ring protruding towards the axis, and the sealing ring contacts the outer wall of the pump main shaft 1.

[0033] By adding the sealing protrusion ring integrally formed on the inner lip of the sealing gasket 402, a stable and reliable annular sealing line can be formed, preventing grease from leaking outward along the shaft wall.

[0034] In one specific embodiment of this utility model, such as Figure 2 As shown, a copper sleeve 7 is nested on the inner circular hole surface of the end cap 5, and the copper sleeve 7 is clearance-fitted with the outer circular wall of the U-shaped shell 401. The copper sleeve 7 is made of brass.

[0035] Specifically, such as Figure 2 As shown, the inner hole of the copper sleeve 7 is a flared opening, and the larger opening of the flared opening faces the inner side of the bearing chamber 3.

[0036] By adding a copper sleeve 7, even when in contact with the outer circular wall of the U-shaped shell 401, a small coefficient of friction is achieved, preventing significant rotational resistance. Furthermore, by designing the inner hole of the copper sleeve 7 as a flared opening, any lubricating grease entering the annular gap will overflow towards the larger end of the flared opening where pressure is lower, reducing the likelihood of outward overflow.

[0037] In summary, the sealing structure of this utility model, which replaces the skeleton oil seal, prevents oil from flowing outward along the axial direction of the pump main shaft 1 by coaxially fixing the sealing ring assembly 4 to the pump main shaft 1 and rotating with it. The end cap 5 seals and protects the outer wall of the sealing ring assembly 4, reducing the risk of lubricating grease overflowing from the outer ring gap. This sealing structure, which replaces the skeleton oil seal, uses a sealing ring assembly that rotates with the shaft, reducing rotational resistance and preventing wear on the pump main shaft. Furthermore, by providing a U-shaped shell 401 with its opening facing the inner cavity of the bearing chamber 3, overflowing lubricating grease can be contained. The inner lip of the sealing gasket 402 protrudes from the inner wall of the U-shaped shell 401 and seals against the outer wall of the pump main shaft 1, preventing lubricating grease from leaking outward along the micro-gap between the inner wall of the U-shaped shell 401 and the pump main shaft 1. By adding an elastic clamping ring 404 to tighten the inner lip of the sealing gasket 402 onto the inner wall of the U-shaped shell 401, the sealing gasket 402 can be effectively prevented from folding and deforming outward. A spacer 403 placed between the vertical side wall of the sealing gasket 402 and the inner end face of the elastic clamping ring 404 prevents the sealing gasket 402 from falling outward. The tongue 4011 prevents the elastic clamping ring 404 from falling outward. The addition of a sealing convex ring integrally formed on the inner lip of the sealing gasket 402 forms a stable and reliable annular sealing line, preventing grease leakage along the shaft wall. The addition of a copper sleeve 7 ensures a low coefficient of friction even when in contact with the outer wall of the U-shaped shell 401, preventing significant rotational resistance. By designing the inner hole of the copper sleeve 7 as a flared opening, even if lubricating grease enters the annular gap, it will overflow towards the larger end of the flared opening where pressure is lower, reducing the likelihood of outward overflow.

[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A sealing structure that replaces the skeleton oil seal for sealing the radial clearance between the pump main shaft (1) and the bearing housing (3) to prevent grease leakage, characterized in that, It includes a sealing ring assembly (4) and an end cap (5). The sealing ring assembly (4) is coaxially fixedly connected to the pump main shaft (1) to prevent oil stains from flowing out along the pump main shaft (1). The end cap (5) is fixedly connected to the outer wall of the shaft hole of the bearing chamber (3) by screws (6). The end cap (5) seals and protects the outer wall surface of the sealing ring assembly (4).

2. The sealing structure for replacing the skeleton oil seal according to claim 1, characterized in that, The sealing ring assembly (4) includes a U-shaped shell (401) and a sealing gasket (402). The U-shaped shell (401) is circular in shape and has a U-shaped cross-section. The inner wall of the U-shaped shell (401) is interference-fitted onto the pump main shaft (1). The opening of the U-shaped shell (401) faces the inner cavity of the bearing chamber (3). The sealing gasket (402) is attached to the opening of the U-shaped shell (401). The inner lip of the sealing gasket (402) protrudes from the inner wall of the U-shaped shell (401) and seals against the outer wall of the pump main shaft (1).

3. The sealing structure for replacing the skeleton oil seal according to claim 2, characterized in that, The sealing ring assembly (4) also includes an elastic hoop (404), which is coaxially disposed inside the opening of the U-shaped shell (401). The elastic hoop (404) clamps the inner lip of the sealing gasket (402) onto the inner wall of the U-shaped shell (401).

4. The sealing structure for replacing the skeleton oil seal according to claim 3, characterized in that, The sealing ring assembly (4) also includes a septum (403), the annular septum (403) being coaxially disposed within the opening of the U-shaped shell (401), the septum (403) being placed between the vertical side wall of the sealing gasket (402) and the inner end face of the elastic hoop (404); the outer side wall edge of the U-shaped shell (401) is provided with a bent tongue (4011), the tongue (4011) blocking contact with the outer end face of the elastic hoop (404).

5. The sealing structure for replacing the skeleton oil seal according to claim 3, characterized in that, The sealing gasket (402) is made of fluororubber material. The inner lip of the sealing gasket (402) is provided with a sealing ring protruding towards the axis, and the sealing ring contacts the outer wall of the pump main shaft (1).

6. The sealing structure for replacing the skeleton oil seal according to claim 2, characterized in that, A copper sleeve (7) is nested on the inner circular hole surface of the end cap (5), and the copper sleeve (7) is clearance-fitted with the outer circular wall of the U-shaped shell (401).

7. The sealing structure for replacing the skeleton oil seal according to claim 6, characterized in that, The inner hole of the copper sleeve (7) is a flared opening, and the larger opening of the flared opening faces the inner side of the bearing chamber (3).

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