CN215633271U - Sealing structure, sectional type exhaust pipe and engine assembly - Google Patents

Abstract

The utility model relates to the field of engines and discloses a sealing structure, a sectional type exhaust pipe and an engine assembly. This seal structure is used for the sealed of inscription blast pipe and external blast pipe kneck of sectional type blast pipe, including public head and female head, public head is located the one end of inscription blast pipe kneck, and female head is located the one end of external blast pipe kneck, and public head and female first clearance fit, the outer peripheral face of public head or the inner peripheral face of female head have seted up sealed annular, and sealed annular is configured to the gas leakage body that can make in the clearance between public head and the female head and forms the circulation. When the temperature of the exhaust pipe is higher, the exhaust pipe expands to cause the clearance between the male head and the female head to expand and generate a sealing effect; when the temperature of the exhaust pipe is lower, the gap between the male head and the female head cannot be expanded, the sealing ring groove plays a role, when leaked gas flows to the sealing ring groove, the leaked gas forms circulation at the sealing ring groove because the pressure at the sealing ring groove is lower, and therefore gas leakage is avoided.

Description

Sealing structure, sectional type exhaust pipe and engine assembly

Technical Field

The utility model relates to the technical field of engines, in particular to a sealing structure, a sectional type exhaust pipe and an engine assembly.

Background

At present, the form of an engine exhaust pipe is mainly divided into an integral exhaust pipe and a sectional exhaust pipe, and for a multi-cylinder engine, the integral exhaust pipe cannot effectively release the thermal stress of work, so that the faults of deformation, damage to an exhaust pipe gasket and the like are easily caused; thus, the segmented exhaust pipe has been widely used in multi-cylinder engines. The sectional exhaust pipe is generally formed by connecting at least two exhaust pipes, and the interface of the sectional exhaust pipe is in a high-temperature and vibrating working environment, and the interface of each exhaust pipe is easy to generate air leakage. Therefore, in order to ensure effective engine performance, further development and study on the reliability of the segmented exhaust pipe seal are required.

At present, a common exhaust pipe section sealing mode is shown in fig. 1, a small gap is reserved between a male head 1 'and a female head 2' of the exhaust pipe, and when an engine runs, the exhaust pipe is heated to expand so that the gap between the male head 1 'and the female head 2' expands to generate a sealing effect. However, the exhaust pipe needs to reach a higher temperature when the gap is completely expanded, but under certain working conditions, particularly when the engine is just started, the exhaust pipe is low in temperature, the gap cannot be expanded, and partial gas leaks from the gap position to cause sealing failure.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a sealing structure, a sectional exhaust pipe and an engine assembly, which aim to solve the technical problem of sealing failure caused by a gap between a male head and a female head when the temperature of the exhaust pipe is low in the prior art.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a seal structure for the inscription blast pipe of sectional type blast pipe and the sealed of external blast pipe kneck, includes public head and female head, public head is located the one end of inscription blast pipe kneck, female head is located the one end of external blast pipe kneck, public head with female first clearance fit, the outer peripheral face of public head or sealed annular has been seted up to the inner peripheral surface of female head, sealed annular is configured to and can makes public head with leak gas in the clearance between the female head forms the circulation.

As the preferred technical scheme of seal structure, the cell wall of seal ring groove includes water conservancy diversion portion and the backward flow portion that connects gradually along gas leakage direction, the slope of water conservancy diversion portion sets up, the backward flow portion is the arc setting, just the tangent line of backward flow portion with contained angle a between the horizontal plane is less than 90 degrees.

As a preferable technical scheme of the sealing structure, the flow guide part and the backflow part are in circular arc transition.

As a preferable technical scheme of the sealing structure, the number of the sealing ring grooves is multiple, and the multiple sealing ring grooves are arranged at intervals along the leakage direction of the gas.

As a preferable technical scheme of the sealing structure, one end, located at the interface of the external exhaust pipe, of the inner circumferential surface of the female head is provided with a first guide surface.

As a preferable technical scheme of the sealing structure, the first guide surface is an inclined surface or an arc surface.

As a preferable technical scheme of the sealing structure, one end of the outer peripheral surface of the male head, which is positioned at the interface of the internal connection exhaust pipe, is provided with a second guide surface.

As a preferable technical scheme of the sealing structure, the second guide surface is an inclined surface or an arc surface.

A segmented exhaust pipe comprising a sealing structure as claimed in any preceding claim.

An engine assembly comprising a segmented exhaust pipe as described above.

The utility model has the beneficial effects that:

the utility model provides a sealing structure for sealing an interface of an internal exhaust pipe and an external exhaust pipe of a sectional exhaust pipe, which comprises a male head and a female head, wherein the male head is positioned at one end of the interface of the internal exhaust pipe, the female head is positioned at one end of the interface of the external exhaust pipe, the male head is in clearance fit with the female head, the outer peripheral surface of the male head or the inner peripheral surface of the female head is provided with a sealing ring groove, and the sealing ring groove is configured to enable leakage gas in a clearance between the male head and the female head to form circulation. When the temperature of the exhaust pipe is higher, the exhaust pipe expands to cause the clearance between the male head and the female head to expand and generate a sealing effect; when the temperature of the exhaust pipe is lower, the gap between the male head and the female head cannot be expanded, the sealing ring groove starts to play a role, and when leaked gas flows to the sealing ring groove, the leaked gas forms circulation at the sealing ring groove because the pressure at the sealing ring groove is lower, so that gas leakage is avoided.

Drawings

FIG. 1 is a schematic structural view of a sealing structure provided by the prior art;

FIG. 2 is a schematic structural diagram of a seal structure provided by an embodiment of the present invention;

fig. 3 is a partial enlarged view at a in fig. 2.

In the figure:

1' male; 2', a female head;

1. a male head; 11. a second guide surface; 2. a female head; 21. a first guide surface; 3. sealing the ring groove; 31. a flow guide part; 32. a reflux part.

Detailed Description

The technical scheme of the utility model is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 2 and 3, the present invention provides a sealing structure for sealing an interface between an internal exhaust pipe and an external exhaust pipe of a sectional exhaust pipe, the sealing structure includes a male head 1 and a female head 2, the male head 1 is located at one end of the interface between the internal exhaust pipe and the external exhaust pipe, the female head 2 is located at one end of the interface between the external exhaust pipe, the male head 1 is in clearance fit with the female head 2, a sealing ring groove 3 is formed on an outer circumferential surface of the male head 1 or an inner circumferential surface of the female head 2, and the sealing ring groove 3 is configured to enable a leakage gas in a gap between the male head 1 and the female head 2 to form a circulation. When the temperature of the exhaust pipe is higher, the exhaust pipe expands to cause the clearance between the male head 1 and the female head 2 to expand and generate a sealing effect; when the temperature of the exhaust pipe is lower, the gap between the male head 1 and the female head 2 cannot be expanded, the sealing ring groove 3 starts to play a role, and when leakage gas flows to the sealing ring groove 3, the leakage gas forms a circular flow at the sealing ring groove 3 because the pressure at the sealing ring groove 3 is lower, so that the gas leakage is avoided.

In this embodiment, the cell wall of seal ring groove 3 includes water conservancy diversion portion 31 and backward flow portion 32 that connect gradually along gas leakage direction, and water conservancy diversion portion 31 slope sets up, and backward flow portion 32 is the arc setting, and the contained angle a between the tangent line of backward flow portion 32 and the horizontal plane is less than 90 degrees. When the leakage gas flows into the seal ring groove 3, the leakage gas flows into the seal ring groove 3 under the guidance of the flow guide portion 31, and then the gas is caused to flow back in the direction opposite to the leakage direction by the flow return portion 32, so that the leakage gas forms a circular flow at the seal ring groove 3. It is rational in infrastructure, play supplementary sealed effect that can be fine. Preferably, the flow guide portion 31 and the backflow portion 32 are in a circular arc transition, so that gas can flow more smoothly in the seal ring groove 3.

The number of the seal ring grooves 3 may be set to be plural, and the plural seal ring grooves 3 are arranged at intervals along the leakage direction of the gas. Multiple sealing can be formed by arranging the plurality of sealing ring grooves 3, and when the leaked gas passes through the first sealing ring groove 3 and is not completely sealed, the later sealing ring grooves 3 can continuously seal the residual leaked gas, so that the sealing performance is further improved. In this embodiment, the number of the seal ring grooves 3 is two, but the number of the seal ring grooves 3 may also be two or more, and is not limited to this embodiment.

One end that the inner peripheral surface of female head 2 is located external blast pipe kneck is equipped with first spigot surface 21, and male head 1 is followed first spigot surface 21 and can be convenient inserts in female head 2. Preferably, the first guide surface 21 is a slope or a cambered surface. The end of the outer peripheral surface of the male head 1, which is positioned at the interface of the internal exhaust pipe, is provided with a second guide surface 11, so that the male head 1 can be conveniently inserted into the female head 2. Preferably, the second guide surface 11 is a slope or a cambered surface.

The utility model also provides a sectional exhaust pipe which comprises the sealing structure. Through adopting above-mentioned seal structure, gas leakage when can avoiding the blast pipe low temperature, sealed effect is better.

An engine assembly comprising a segmented exhaust pipe as described above.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. 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. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The utility model provides a seal structure for the inscription blast pipe of sectional type blast pipe and the sealed of external blast pipe kneck, a serial communication port, including public head (1) and female head (2), public head (1) is located the one end of inscription blast pipe kneck, female head (2) are located the one end of external blast pipe kneck, public head (1) with female head (2) clearance fit, the outer peripheral face of public head (1) or sealed annular (3) have been seted up to the inner peripheral surface of female head (2), sealed annular (3) are configured to and can make public head (1) with gas leakage body in the clearance between female head (2) forms the circulation.

2. The sealing structure according to claim 1, characterized in that the groove wall of the sealing ring groove (3) comprises a flow guiding portion (31) and a backflow portion (32) which are sequentially connected along the gas leakage direction, the flow guiding portion (31) is obliquely arranged, the backflow portion (32) is arranged in an arc shape, and an included angle a between a tangent of the backflow portion (32) and the horizontal plane is smaller than 90 degrees.

3. The sealing structure according to claim 2, characterized in that between the flow guide (31) and the return (32) there is a circular arc transition.

4. The seal structure according to claim 1, characterized in that the number of the seal ring grooves (3) is plural, and the plural seal ring grooves (3) are arranged at intervals in a leakage direction of the gas.

5. The sealing structure according to any one of claims 1 to 4, characterized in that the end of the inner peripheral surface of the female head (2) at the external exhaust pipe interface is provided with a first guide surface (21).

6. The sealing structure according to claim 5, characterized in that the first guide surface (21) is a bevel or a cambered surface.

7. The sealing structure according to any one of claims 1 to 4, characterized in that the end of the outer peripheral surface of the male head (1) at the internal exhaust pipe interface is provided with a second guide surface (11).

8. The sealing structure according to claim 7, characterized in that the second guide surface (11) is a bevel or a cambered surface.

9. A segmented exhaust pipe comprising a sealing structure according to any one of claims 1 to 8.

10. An engine assembly comprising the segmented exhaust pipe of claim 9.

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