Bearing box with internal and external air pressure adjusting device

Abstract

The utility model relates to the field of pumps, in particular to a bearing box with internal and external air pressure adjusting devices. Comprising a box, rotating shafts and adjusting mechanisms. Wherein the rotating shaft penetrates through the box body, a cavity is formed between the rotating shaft and the box body, and temperature rise of the cavity and pressure difference between the cavity and the outside are caused by rotation of the rotating shaft; the adjusting mechanism comprises a first adjuster and a second adjuster, a pressure balance channel communicating the cavity with the outside is formed between the first adjuster and the second adjuster, and the first adjuster and the second adjuster are in sliding fit in the axial direction to be used for changing the air flow of the pressure balance channel. Through axial sliding fit of the first regulator and the second regulator, the sectional area of the pressure balance channel is adjusted, balance control under different air pressures is achieved, and the adverse effect of high pressure of the cavity on the bearing and the rotating shaft is restrained.

Description

TECHNICAL FIELD

[0001] The utility model relates to pump machine field especially, it relates to a bearing box with inside and outside air pressure regulating device. BACKGROUND

[0002] Bearing box as the key part of rotating equipment needs to be lubricated by sliding oil to reduce the friction loss of rotating shaft and bearing. For high speed heavy load working condition, the sliding oil used has higher viscosity, and the viscous sliding oil usually adopts external oil pump to pump into the bearing box to realize forced lubrication, but high pressure oil injection can cause the gas pressure in the chamber to rise sharply, forming a high pressure environment that is not conducive to the stable operation of rotating shaft and bearing. SUMMARY

[0003] The utility model aims at providing a bearing box with inside and outside air pressure regulating device to solve the problem of pressure rise in the bearing box caused by the operation of the rotating shaft in the prior art.

[0004] The technical scheme of the utility model is: a bearing box with inside and outside air pressure regulating device, comprising:

[0005] A box body and a rotating shaft, the rotating shaft penetrates the box body and forms a chamber with the box body, and the rotation of the rotating shaft causes the temperature rise of the chamber and the pressure difference between the chamber and the outside world;

[0006] An adjusting mechanism, comprising a first adjuster and a second adjuster, a pressure balance channel communicating the chamber with the outside world is formed between the first adjuster and the second adjuster, and the first adjuster and the second adjuster are axially slidingly matched to change the air flow of the pressure balance channel.

[0007] Preferably, the chamber is filled with sliding oil, a communication groove is formed in the first adjuster, the communication groove makes the first adjuster form a discontinuous structure, and the oil film formed between the first adjuster and the second adjuster in the form of non-continuous oil film exists in the form of non-continuous oil film.

[0008] Preferably, the first adjuster and the second adjuster are both arranged in the form of ring structure and are fixed with the inner wall of the box body and the rotating shaft respectively.

[0009] Preferably, the cross section of the first adjuster and the second adjuster along their own axis is formed in the form of T-shaped structure and C-shaped structure respectively; wherein the tail of the T-shaped structure is fixed perpendicularly to the inner wall of the box body, and the open end of the C-shaped structure is arranged corresponding to the head of the T-shaped structure.

[0010] Preferably, the first regulator and the second regulator are respectively formed in I-shaped and C-shaped sections through their own axes; wherein, the I-shaped structure is vertically fixed to the inner wall of the box, and the open end of the C-shaped structure is provided corresponding to the end of the I-shaped structure.

[0011] Preferably, two oil films are formed between the two sides of the second regulator and the inner wall of the first regulator, and a space for lubricating oil to remain is formed between the end face of the second regulator away from the housing and the inner wall of the first regulator.

[0012] Preferably, the outer wall of the second adjuster away from the rotation axis is configured as a guide surface, and the guide surface is configured to face the inner wall of the fixed first adjuster.

[0013] Preferably, the second adjuster has a connecting hole along the radial direction; a fastener with a through connecting hole fixes the second adjuster to the rotating shaft.

[0014] Compared with the prior art, the advantages of this utility model are:

[0015] (1) This application adjusts the cross-sectional area of ​​the pressure balance channel by axial sliding cooperation between the first regulator and the second regulator, thereby achieving balance control under different air pressures and suppressing the adverse effects of high pressure in the chamber on the bearing and rotating shaft.

[0016] (2) The design of the connecting groove on the first regulator in this application disrupts the continuity of the lubricating oil at the gap, avoids the oil film from blocking the airflow channel, and ensures that the air pressure regulation function is stable and reliable. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a structural diagram of a bearing housing with an internal and external air pressure regulating device according to the present invention;

[0019] Figure 2 This is a cross-sectional view of a bearing housing with an internal and external air pressure regulating device according to the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of a specific area;

[0021] Figure 4 This is a structural diagram of the first regulator according to the preferred embodiment of the present invention;

[0022] Figure 5 This is a structural diagram of the second regulator of this utility model;

[0023] Figure 6 This is a schematic diagram of the adjustment mechanism in the preferred embodiment of the present invention;

[0024] Figure 7 Adjusting mechanism cooperation schematic view for part of embodiments of the utility model is provided.

[0025] Among them: 1, box, 2, rotating shaft, 3, adjusting mechanism, 31, first adjuster, 32, second adjuster, 33, communication groove, 34, guide surface, 35, connecting hole, 4, oil hole. Specific embodiments

[0026] The contents of the utility model are further described in detail in combination with specific embodiments as follows:

[0027] As shown in Figure 1 and Figure 2 , a bearing box with internal and external air pressure adjusting device includes box 1 and rotating shaft 2.

[0028] Rotating shaft 2 penetrates box 1 and cooperates with the bearing installed in box 1, so that the outer wall of rotating shaft 2 and the inner wall of box 1 form a sealed chamber. Oil hole 4 is provided on box 1 and filled with lubricating oil into the chamber by external oil pump for forced lubrication of rotating shaft 2 and second adjuster 32 when rotating.

[0029] Because the application scenario of the present application is high speed and heavy load, the lubricating oil used is relatively viscous, so when the oil pump pumps lubricating oil into the chamber, there will be a lot of pressure, which will cause the gas pressure in the chamber to rise. This high pressure environment is not conducive to the stable operation of rotating shaft 2 and the bearing.

[0030] In combination Figures 2-7 , the present application is provided with adjusting mechanism 3 for solving this problem, adjusting mechanism 3 includes first adjuster 31 and second adjuster 32 cooperating with each other. The gap between first adjuster 31 and second adjuster 32 can form a pressure balance channel connecting the chamber and the outside, and first adjuster 31 and second adjuster 32 can slide relative to each other, so as to change the cross-sectional area of the pressure balance channel, and then the gas flow in the pressure balance channel changes accordingly, adapting to the pressure balance requirement under different working conditions.

[0031] Specifically, as shown in Figure 4 and Figure 5 , first adjuster 31 and second adjuster 32 are both provided as ring structure. First adjuster 31 is fixed on the inner wall of box 1. Second adjuster 32 is sleeved on rotating shaft 2, and connecting hole 35 is provided on second adjuster 32 in radial direction. The top wire penetrating connecting hole 35 keeps second adjuster 32 at an axial position on rotating shaft 2, and adjusts the axial position according to the requirement, so that it has different distance with first adjuster 31.

[0032] In the present embodiment, the lubricant is prone to adhere to the gap between the first adjuster 31 and the second adjuster 32, i.e. to form an oil film to seal the pressure balance channel, so that the pressure balance channel cannot balance the inner and outer air pressures.

[0033] To solve this problem, as shown in Figure 4 , a communication groove 33 is formed on the first adjuster 31, which forms an opening on the first adjuster 31, so that the lubricant adhering to the first adjuster 31 and the second adjuster 32 cannot form a continuous oil film, and the pressure balance channel remains open.

[0034] In some embodiments of the present application, as shown in Figure 7 , the first adjuster 31 and the second adjuster 32 are respectively formed into I-shaped and C-shaped structures through their own axial cross sections. Among them, the I-shaped structure is fixed vertically to the inner wall of the box 1, and the open end of the C-shaped structure is arranged corresponding to one end of the I-shaped structure in the box 1.

[0035] In the preferred embodiments of the present application, as shown in Figure 6 , the first adjuster 31 and the second adjuster 32 are respectively formed into T-shaped and C-shaped structures through their own axial cross sections. Among them, the tail of the T-shaped structure is fixed vertically to the inner wall of the box 1, and the open end of the C-shaped structure is arranged corresponding to the head of the T-shaped structure. The first adjuster 31 has the following advantages compared with the structure in other embodiments:

[0036] In combination with Figure 6 and Figure 7 , the length A between the two ends of the head of the T-shaped structure and the open end of the C-shaped structure along the axis of the rotating shaft 2 is much smaller than the length B between the I-shaped structure and the open end of the C-shaped structure along the axis of the rotating shaft 2, so that the lubricant is more prone to form an oil film in the gap between the two places and fill the gap, so that the rotating first adjuster 31 can be fully lubricated. Therefore, the lubricant can further fill the space formed between the end surface of the second adjuster 32 away from the box 1 and the inner wall of the first adjuster 31, and stay in the space. So that the first adjuster 31 can be immediately lubricated as soon as the rotating shaft 2 starts.

[0037] In addition, in combination with Figure 2 and Figure 5 , the outer wall of the second adjuster 32 away from the rotating shaft 2 is arranged as a guide surface 34, and the guide surface 34 is arranged towards the inner wall of the fixed first adjuster 31. Such arrangement makes the high-pressure lubricant injected into the oil injection hole 4 be able to bounce onto the corresponding inner wall of the box 1 after hitting the guide surface 34, thereby reducing the axial impact force of the impact on the adjusting mechanism 3.

[0038] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application, therefore, from any point of view, the examples should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A bearing housing having an internal and external air pressure adjusting device, characterized by, The utility model relates to a kind of oil film regulating mechanism, including: Box (1) and rotating shaft (2), the rotating shaft (2) is through and forms cavity with box (1) between, and the rotation of the rotating shaft (2) brings the temperature rise of cavity and the pressure difference of cavity and outside world; Adjusting mechanism (3), including first regulator (31) and second regulator (32), the first regulator (31) and second regulator (32) form the pressure balance passage of communication cavity and outside world, and the first regulator (31) and second regulator (32) are axially sliding fit for changing the air flow of the pressure balance passage.

2. The bearing housing with internal and external air pressure adjustment device according to claim 1, characterized in that, The cavity is filled with lubricating oil, the first regulator (31) is provided with communication groove (33), the communication groove (33) makes the first regulator (31) form discontinuous structure, and the oil film between the fitting end of the first regulator (31) and the second regulator (32) is in discontinuous form by the discontinuous first regulator (31).

3. The bearing housing with internal and external air pressure adjustment according to claim 2, characterized in that The first regulator (31) and second regulator (32) are both arranged as annular structure, and are fixed with box (1) inner wall and rotating shaft (2) respectively.

4. The bearing housing having an internal and external air pressure adjusting device according to claim 3, wherein, The cross section of the first regulator (31) and second regulator (32) is formed as T-shaped structure and C-shaped structure respectively through its own axis line;Wherein, the tail of the T-shaped structure is fixed vertically to the inner wall of box (1), and the open end of the C-shaped structure is arranged corresponding to the head of the T-shaped structure.

5. The bearing housing with internal and external air pressure adjustment according to claim 3, characterized in that, The cross section of the first regulator (31) and second regulator (32) is formed as I-shaped structure and C-shaped structure respectively through its own axis line;Wherein, the I-shaped structure is fixed vertically to the inner wall of box (1), and the open end of the C-shaped structure is arranged corresponding to the end of the I-shaped structure.

6. The bearing housing having an internal and external air pressure adjusting device according to claim 4, wherein, Two oil films are formed between the two sides of the second regulator (32) and the inner wall of the first regulator (31), and the space for lubricating oil retention is formed between the end face of the second regulator (32) away from box (1) and the inner wall of the first regulator (31).

7. The bearing housing with internal and external air pressure adjustment according to claim 6, characterized in that The outer wall of the second regulator (32) away from rotating shaft (2) is arranged as guide surface (34), and the guide surface (34) is arranged towards the inner wall of the fixed first regulator (31).

8. The bearing housing having an internal and external air pressure adjusting device according to claim 4, wherein, Connecting hole (35) is radially arranged on the second regulator (32);Fastener through connecting hole (35) is fixed on the rotating shaft (2).

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