CN215861652U

CN215861652U - Pressure difference balance structure of closed space, speed reducer and engineering machinery

Info

Publication number: CN215861652U
Application number: CN202122324141.7U
Authority: CN
Inventors: 倪超; 朱仕元; 张磊
Original assignee: Suote Transmission Equipment Co Ltd
Current assignee: Suote Transmission Equipment Co Ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-02-18
Anticipated expiration: 2031-09-24

Abstract

The utility model provides a pressure difference balance structure of a closed space, a speed reducer and engineering machinery, wherein the pressure difference balance structure of the closed space comprises: the mounting table is provided with an air vent, and two ends of the air vent are respectively suitable for being communicated with the closed space and the external space; a vent plug in communication with the vent hole; the baffle is arranged on the mounting table or in the vent hole, the baffle is positioned on the inner side of the vent plug, and at least part of the vent hole is shielded by the baffle. The technical scheme of the utility model overcomes the defect that the ventilation cap of the speed reducer in the prior art is easy to accumulate dust and block.

Description

Pressure difference balance structure of closed space, speed reducer and engineering machinery

Technical Field

The utility model relates to the technical field of pressure balance structures, in particular to a pressure difference balance structure of a closed space, a speed reducer and an engineering machine.

Background

A mixer truck is a commonly used construction machine. The speed reducer for the mixing drum in the prior art is usually driven by a two-stage planetary gear train, the two-stage planetary gear structure is in a large oil cavity, and the oil cavity is exhausted through a vent cap arranged at the top. In the high-speed operation process of the speed reducer, lubricating oil splashes at a high speed at the vent cap, and partial oil leaks from the vent cap, so that dust around the vent cap is condensed, and the problems of blockage of the vent cap, lubricating oil pollution and the like can be caused by long-time accumulation. In addition, when the speed reducer is in cold start, the temperature of the gear and the bearing is rapidly increased, the internal air pressure of the speed reducer is larger than the external air pressure, and if an internal and external pressure difference balance structure is not adopted, the high-speed shaft oil seal is easily damaged for a long time.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defect that the ventilation cap of the speed reducer in the prior art is easy to deposit dust and block, thereby providing a pressure difference balance structure of a closed space, the speed reducer and engineering machinery.

In order to solve the above problems, the present invention provides a pressure difference balancing structure of a closed space, comprising: the mounting table is provided with an air vent, and two ends of the air vent are respectively suitable for being communicated with the closed space and the external space; a vent plug in communication with the vent hole; the baffle is arranged on the mounting table or in the vent hole, the baffle is positioned on the inner side of the vent plug, and at least part of the vent hole is shielded by the baffle.

Optionally, a baffle is disposed on the mounting table, the baffle being located inside the vent with a gap therebetween.

Optionally, the baffle is connected to the mounting table by a fastener; or the baffle and the mounting table are of an integral structure.

Optionally, the pressure difference balance structure further comprises a condenser pipe, a first end of the condenser pipe is connected in the vent hole, a second end of the condenser pipe extends towards the outside of the vent hole, and the vent plug is arranged at the second end of the condenser pipe.

Optionally, a sealing structure is arranged between the condensation pipe and the vent hole.

Optionally, the vent plug is a one-way vent plug adapted to communicate the gas flow from the enclosed space in a direction towards the external space.

The utility model also provides a speed reducer which comprises the pressure difference balancing structure of the closed space.

Optionally, the reducer comprises a housing, an end cap disposed at an end of the housing, and a transmission structure disposed within the housing, the mount being formed on the end cap.

Optionally, the vent hole is provided on a side wall of the end cover, and the vent hole is located at an upper portion of the speed reducer.

The utility model also provides engineering machinery comprising the speed reducer.

The utility model has the following advantages:

by applying the technical scheme of the utility model, when the pressure difference balance structure is applied to the speed reducer, the lubricating oil can splash when the transmission structure in the speed reducer operates, and the baffle can block most of the splashed lubricating oil, so that the condition that a large amount of oil is accumulated at the vent plug due to the fact that the lubricating oil is leaked at the vent plug is avoided. Therefore, the technical scheme of the utility model overcomes the defect that the ventilation cap of the speed reducer in the prior art is easy to accumulate dust and block.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 shows a schematic of the construction of the reducer of the present invention;

fig. 2 shows an enlarged schematic view at a in fig. 1 (i.e., a pressure difference equalizing structure of a closed space);

FIG. 3 shows a schematic cross-sectional view at the end cap of the retarder of FIG. 1;

FIG. 4 shows a schematic cross-sectional view of an end cap of the retarder of FIG. 1; and

FIG. 5 shows a schematic front view of the end cap of the retarder of FIG. 1.

Description of reference numerals:

10. an installation table; 20. a vent hole; 30. a baffle plate; 40. a condenser tube; 50. a vent plug; 60. a sealing structure; 100. a housing; 200. and (4) end covers.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and 2, the pressure difference equalizing structure of the enclosed space of the present embodiment includes a mounting table 10, a baffle 30, a condensation duct 40, and a vent plug 50. Wherein, the mounting table 10 is provided with a vent hole 20, and both ends of the vent hole 20 are respectively suitable for being communicated with the closed space and the external space. The baffle 30 is disposed on the mounting table 10 and inside the ventilation hole 20 with a gap between the baffle 30 and the ventilation hole 20, and the baffle 30 shields at least a part of the ventilation hole 20. A first end of the condensation duct 40 is connected inside the vent hole 20, and a second end of the condensation duct 40 extends toward the outside of the vent hole 20. A vent plug 50 is provided at a second end of the condensation duct 40.

By applying the technical scheme of the embodiment, when the pressure difference balance structure is applied to the speed reducer, the transmission structure in the speed reducer can cause the lubricating oil to splash during operation, and the baffle 30 can block most of the splashed lubricating oil to prevent the lubricating oil from leaking at the vent plug 50. Meanwhile, oil gas is condensed on the side wall of the condensation pipe 40 after passing through the condensation pipe and generates backflow, redundant gas is discharged out of the speed reducer through the vent plug, and the condition that a large amount of oil liquid is accumulated at the vent plug is not easy to cause. Therefore, the technical scheme of the embodiment overcomes the defect that the ventilation cap of the speed reducer in the prior art is easy to accumulate dust and block.

The "mounting base 10" is formed on a side wall of the closed space or other shell-like structure. Both ends of the vent hole 20 communicate with the closed space and the external space, respectively, so that the gas in the closed space can be discharged to the external space through the vent hole 20, the condensation duct 40, and the vent plug 50.

Of course, in some embodiments, not shown, the baffle 30 may be disposed in the vent hole 20, and may also have a function of blocking the splashed lubricating oil. In practice, the baffle 30 may be located just inside the vent plug 50.

For convenience of explanation, the pressure difference balancing structure will be exemplified below as applied to a speed reducer. However, it will be understood by those skilled in the art that any mechanical structure having a sealed space can be used to balance the pressure in the sealed space by using the above-mentioned pressure difference balancing structure.

As shown in fig. 3 to 5, in the solution of the present embodiment, the baffle plate 30 is located at a position right below the vent hole 20, and the baffle plate 30 blocks the lower end opening of the vent hole 20 in the vertical direction. The above structure enables the baffle 30 to shield most of the splashed lubricating oil. Of course, in some embodiments not shown, the baffle 30 may also cover only a portion of the lower end of the ventilation hole 20 in the vertical direction, which is also a possible embodiment.

As shown in fig. 4, in the solution of the present embodiment, the baffle 30 is disposed perpendicular to the central axis of the vent hole 20. Specifically, the baffle 30 is horizontally disposed at a position below the vent hole 20. When the transmission structure in the speed reducer operates, the lubricating oil is driven to splash upwards. Since the baffle 30 is disposed perpendicular to the center axis of the vent hole 20, most of the splashed lubricating oil is blocked by the baffle 30 and does not enter the vent hole 20.

Preferably, the baffle 30 is attached to the mounting table by fasteners. Or the baffle 30 is integral with the mounting station 10. Specifically, as can be seen from fig. 4, the baffle 30 and the mounting platform 10 are integrally formed and formed by integral casting. Of course, the baffle 30 may be integrally connected to the mounting block 10 by other connecting means, such as welding. Alternatively, the baffle 30 may be attached to the mounting platform 10 by means of a plug, rivet, fastener connection, or the like.

As shown in fig. 1 to 3, in the present embodiment, the condensation pipe 40 is a thin circular pipe. When the high-temperature oil gas rises along the condensation pipe 40, the oil gas contacts with the inner wall of the condensation pipe 40 and is condensed, so that the backflow of the oil gas is realized. Therefore, the condensation pipe 40 not only can reduce the loss of the lubricating oil, but also can effectively avoid the pollution caused by the accumulation of the oil. Meanwhile, because the condensation pipe 40 is of a slender structure, part of splashed lubricating oil is difficult to reach the vent plug 50, and therefore oil leakage is avoided.

As shown in fig. 2 and 3, in the present embodiment, a sealing structure 60 is provided between the condensation duct 40 and the vent hole 20. The sealing structure 60 is clamped between the outer wall of the condensation pipe 40 and the inner wall of the vent hole 20, so that oil gas is prevented from leaking along a gap between the outer wall of the condensation pipe 40 and the inner wall of the vent hole 20, and the oil gas leakage-proof effect is further ensured.

Preferably, the sealing structure 60 in this embodiment is a sealing ring.

Preferably, the vent plug 50 in this embodiment is a one-way vent plug adapted to allow the flow of gas to pass from the enclosed space in a direction towards the external space. Specifically, the vent plug 50 in this embodiment is a normally closed one-way vent plug, and when part of high-temperature oil gas reaches the one-way vent plug, the oil gas can be discharged out of the inner cavity of the speed reducer due to differential pressure, so that the balance of the internal and external differential pressures is realized. In addition, the one-way vent plug can also effectively prevent dust and water from entering the speed reducer, and prevent lubricating oil in the speed reducer from being polluted by the outside.

As shown in fig. 1, the present embodiment also provides a speed reducer including the above-described pressure difference equalizing structure. Specifically, when the speed reducer operates, the gears in the inner cavity of the speed reducer stir oil at a high speed, the baffle 30 can effectively prevent splash lubricating oil from entering the condensation pipe 40, and only oil gas enters the condensation pipe 40. The oil gas is condensed by the slender condensation pipe 40 to generate backflow, and redundant gas is discharged out of the speed reducer through the vent plug, so that the condition that a large amount of oil liquid is accumulated at the vent plug 50 is not easy to cause. After the reducer is started in a cold state, the internal oil pressure rises rapidly and exceeds the external atmospheric pressure, so that oil leakage of an oil seal or a joint surface can be caused. The internal pressure difference balancing structure can realize the balance of the internal and external pressure differences of the speed reducer in any running or static state. Therefore, each component of the planetary gear train in the whole oil cavity is in a state of relatively balanced and stable pressure, and the service life of the whole speed reducer is prolonged.

As shown in fig. 1 and 2, in the present embodiment, the reduction gear includes a housing 100 and an end cap 200 provided at an end of the housing 100, and the mount 10 is formed on the end cap 200. Preferably, the vent hole 20 is provided on the side wall of the end cap 200, and the vent hole 20 is located at the upper portion of the speed reducer.

The embodiment also provides the engineering machinery, and the engineering machinery comprises the speed reducer. Preferably, the engineering machinery is a mixer truck, and the speed reducer is a mixer bucket speed reducer. Of course, the above-described reducer structure may be employed in other construction machines provided with a reducer.

According to the above description, the present patent application has the following advantages:

1. an oil baffle plate is arranged at the joint of the vent hole and the shell, so that the harm caused by splashing of lubricating oil can be effectively reduced;

2. the vent plug is not directly connected with the shell, so that a slender oil pipe is added, and the pollution and the loss of oil are reduced.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims

1. A pressure difference equalizing structure of a closed space, comprising:

the air conditioner comprises an installation table (10), wherein an air vent (20) is arranged on the installation table (10), and two ends of the air vent (20) are respectively suitable for being communicated with a closed space and an external space;

a vent plug (50) in communication with the vent hole (20);

a baffle plate (30) disposed on the mounting table (10) or within the vent hole (20), the baffle plate (30) being located inside the vent plug (50), and the baffle plate (30) shielding at least a portion of the vent hole (20).

2. The pressure difference equalizing structure according to claim 1, wherein said baffle plate (30) is provided on said mount table (10), said baffle plate (30) being located inside said vent hole (20), said baffle plate (30) and said vent hole (20) having a gap therebetween.

3. The pressure difference equalizing structure according to claim 2, wherein said baffle plate (30) is attached to said mounting table by a fastener; or the baffle (30) and the mounting table (10) are of an integral structure.

4. A pressure difference equalizing structure according to any one of claims 1 to 3, characterized in that the pressure difference equalizing structure further comprises a condensation duct (40), a first end of the condensation duct (40) being connected within the vent hole (20), a second end of the condensation duct (40) extending toward an outside of the vent hole (20), the breather plug (50) being provided at the second end of the condensation duct (40).

5. The pressure difference equalizing structure according to claim 4, wherein a sealing structure (60) is provided between the condensation duct (40) and the vent hole (20).

6. A pressure-difference equalizing structure according to any one of claims 1 to 3, characterized in that the breather plug (50) is a one-way breather plug adapted to circulate a gas flow from the closed space in a direction towards the external space.

7. A decelerator comprising a pressure difference equalizing structure of a closed space according to any one of claims 1 to 6.

8. Decelerator according to claim 7, characterized in that it comprises a housing (100), an end cap (200) arranged at the end of the housing (100) and a transmission structure arranged inside the housing (100), the mounting table (10) being formed on the end cap (200).

9. Decelerator according to claim 8, characterized in that the vent hole (20) is provided on a side wall of the end cap (200), and the vent hole (20) is located at an upper portion of the decelerator.

10. A working machine, characterized by comprising a retarder according to any of claims 7-9.