Carbon ring sealing structure of air compressor with ultra-large shaft diameter

Abstract

The utility model relates to the field of sealing structures, and discloses a carbon ring sealing structure of an air compressor with an ultra-large shaft diameter, which comprises a shaft sleeve, a sealing gland and a plurality of carbon rings, an airflow sealing channel is arranged on the sealing gland; the shaft sleeve is sleeved with the carbon ring in a floating mode, the carbon ring is located in an inner cavity of the sealing gland, an air film sealing groove is formed in the inner side of the carbon ring, and the air film sealing groove is communicated with the airflow sealing channel. The utility model has the beneficial effects that dry gas is introduced to form a gas film in the gas film sealing groove, throttling and pressure reduction are generated, then external unqualified air is isolated through the dry gas, and as the carbon ring and the shaft sleeve are sealed in a floating manner (the carbon ring and the shaft sleeve are basically in a non-contact state), when the compressor works, the abrasion of the carbon ring is small, the replacement frequency of the carbon ring is reduced, and the service life of the compressor is prolonged. And the maintenance cost and downtime of the wind tunnel are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technology of sealing structure, concretely relates to a super large shaft diameter air compressor carbon ring sealing structure. BACKGROUND

[0002] The wind tunnel is the national key equipment for promoting the development of aerospace vehicles, and the air compressor of the super large shaft diameter wind tunnel test field is the core power of the continuous transonic wind tunnel, is called the heart of the wind tunnel, and the air compressor has a decisive role on the realization of the performance index of the wind tunnel, safe and stable operation.

[0003] At present, for the super large shaft diameter air compressor, the shaft end sealing mode usually adopts the labyrinth seal, since the labyrinth seal is through the contact type seal, the super large shaft diameter (the shaft diameter is greater than or equal to 700mm) makes the friction torque that the sealing component bears larger, leads to the fast wear of the sealing piece, and the frequent replacement of the sealing piece increases the maintenance cost and downtime of the wind tunnel. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem that the end part of the super large shaft diameter rotating shaft adopts the labyrinth seal, the labyrinth seal wears fast, and the equipment maintenance cost is high, and the purpose is to provide a super large shaft diameter air compressor carbon ring sealing structure, sets up the carbon ring as the end part sealing structure of the super large shaft diameter rotating shaft, passes into the dry gas and forms the gas film in the gas film sealing groove, makes the carbon ring and the sleeve be in the non-contact state basically, the carbon ring wears small, reduces the frequency of replacing the carbon ring, reduces the maintenance cost and downtime of the wind tunnel.

[0005] The utility model realizes by the following technical scheme:

[0006] A super large shaft diameter air compressor carbon ring sealing structure, including the sleeve, the sealing gland and several carbon rings, the sleeve is set on the rotating shaft;The sealing gland is provided with the airflow sealing channel;The carbon ring is set on the sleeve and is located in the inner chamber of the sealing gland, the inner side of the carbon ring is provided with the gas film sealing groove, and the gas film sealing groove is communicated with the airflow sealing channel.

[0007] The utility model has the advantages that the airflow sealing channel is set on the sealing gland, dry air is filled in the sealing channel, the carbon ring provided with the gas film sealing groove is set on the sleeve, the gas film sealing groove is communicated with the airflow sealing channel, the dry gas forms the gas film in the gas film sealing groove, throttles and depressurizes, and then the dry gas isolates the unqualified air outside, since the carbon ring and the sleeve are in the floating seal (both are in the non-contact state basically), therefore, when the compressor works, the carbon ring wears small, the frequency of replacing the carbon ring is reduced, and the maintenance cost and downtime of the wind tunnel are reduced.

[0008] In some embodiments, the air flow sealing channel comprises an air inlet channel and an air outlet channel, the air inlet channel and the air outlet channel extend along the radial direction of the sealing gland, a gap is provided between the inner side of the sealing gland and the outer periphery of the shaft sleeve, and the sealing gland is fixedly connected to the compressor support. By extending the air inlet channel and the air outlet channel along the radial direction of the sealing gland, it is convenient to introduce dry air into the air film sealing groove through the air inlet channel, and by providing the air outlet channel, the air flow flows out along the air outlet channel, and by providing a gap between the sealing gland and the outer periphery of the shaft sleeve, the sealing gland is prevented from contacting the shaft sleeve without affecting the sealing effect.

[0009] In some embodiments, the air film sealing groove comprises a radial flow guide groove and an annular groove, the radial flow guide groove communicates with the annular groove, the annular groove extends along the inner side wall of the carbon ring, and the radial flow guide groove extends to the annular groove along one side of the carbon ring. By communicating the radial flow guide groove with the annular groove, it is convenient for the dry air flow to enter the annular groove from the radial flow guide groove, and by extending the annular groove along the inner side wall of the carbon ring, it is convenient to form a vortex at the annular groove of the carbon ring when the rotating shaft is stationary, and to form an air film with a certain rigidity at the annular groove of the carbon ring when the shaft rotates, so that the carbon ring and the rotating shaft are substantially concentric.

[0010] In some embodiments, a plurality of radial flow guide grooves are provided on the same carbon ring, and the plurality of radial flow guide grooves are located on one side of the carbon ring. By locating the plurality of radial flow guide grooves on one side of the carbon ring, the direction of the air flow forming the air film is consistent, the air flow is prevented from being turbulent, and the sealing effect of the air film is ensured.

[0011] In some embodiments, the inlet ends of the radial flow guide grooves on both sides of the air inlet channel are directed towards the air inlet channel, and the inlet ends of the radial flow guide grooves on the side of the air outlet channel away from the air inlet channel are directed towards the air inlet channel. By providing carbon rings on both sides of the air inlet channel, it is prevented that the dry air entering from the air inlet channel directly enters the air outlet channel, which affects the sealing effect, and the consumption of air volume is reduced.

[0012] In some embodiments, a plurality of annular mounting grooves are provided on the inner side of the sealing gland, a limiting baffle is mounted in each annular mounting groove, and each carbon ring is located in the corresponding annular mounting groove. By providing a limiting baffle, the limiting baffle is composed of a plurality of petals, which facilitates the installation of the carbon ring and provides sufficient installation space for the carbon ring.

[0013] In some embodiments, the carbon ring is split into several parts, each part is provided with a groove, and the several parts are connected into a ring by a spring hoop, and the spring is in the form of a ring and located in the groove. By connecting the several parts of the carbon ring into a whole by the spring, the spring can reset the gap between the carbon ring and the shaft sleeve when the carbon ring is worn out.

[0014] In some embodiments, the inner side of the shaft sleeve is provided with several sealing ring installation grooves, and each of the sealing ring installation grooves is installed with a shaft sleeve sealing ring. By providing several sealing rings on the inner side of the shaft sleeve, the leakage of medium side air from the gap between the shaft sleeve and the rotating shaft is prevented.

[0015] In some embodiments, the end of the sealing gland connected to the compressor support is provided with an installation groove, and the installation groove is installed with a gland sealing ring. By providing a sealing ring at the end of the sealing gland connected to the compressor support, the air flow from the connection between the sealing gland and the compressor support into the compressor is prevented.

[0016] In some embodiments, a transmission sleeve is further provided, the transmission sleeve is sleeved on the rotating shaft, the transmission sleeve is fixedly connected to the end of the rotating shaft located on the atmospheric side through a connecting screw, one side of the transmission sleeve is provided with a protrusion, and one end of the shaft sleeve is provided with a groove matched with the protrusion. By providing the transmission sleeve, fixing the transmission sleeve to the rotating shaft, providing the protrusion on one side of the transmission sleeve, and providing the groove matched with the protrusion on one end of the shaft sleeve, the relative rotation between the shaft sleeve and the rotating shaft is prevented.

[0017] Compared with the prior art, the utility model has the advantages and beneficial effects that:

[0018] 1. The carbon ring is provided as the end sealing structure of the super-large shaft diameter rotating shaft, the dry gas entering from the air inlet channel forms a gas film in the gas film sealing groove, so that the carbon ring and the shaft sleeve are in a non-contact state, the carbon ring is less worn, the frequency of replacing the carbon ring is reduced, and the maintenance cost and downtime of the wind tunnel are reduced.

[0019] 2. The gap is provided between the sealing gland and the outer periphery of the shaft sleeve, and the gap prevents the sealing gland from contacting the shaft sleeve without affecting the sealing effect.

[0020] 3. The annular groove extends along the inner side wall of the carbon ring, so that the vortex is formed in the annular groove of the carbon ring when the rotating shaft is stationary, and the gas film with a certain rigidity is formed in the annular groove of the carbon ring when the shaft rotates, so that the carbon ring and the rotating shaft are basically kept concentric.

[0021] 4. All of the radial guide grooves are located on one side of the carbon ring to ensure consistent airflow direction, avoid airflow turbulence, and ensure the sealing effect of the air film.

[0022] 5. Use springs to clamp the several carbon rings into a whole, so that the spring's restoring force can be used to maintain a set gap between the carbon ring and the bushing even after the inner side of the carbon ring has a certain amount of wear. The set gap is determined by a combination of factors such as temperature and shaft diameter. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This utility model Figure 1 Enlarged view of section K1;

[0026] Figure 3 This utility model Figure 1 A magnified view of section K in the middle.

[0027] The attached diagram shows the markings and corresponding component names:

[0028] 1. Shaft sleeve seal ring, 2. Shaft sleeve, 3. Carbon ring, 31. Annular groove, 32. Radial guide groove, 4. Limiting baffle, 5. Sealing cover, 51. Air inlet channel, 52. Air outlet channel, 6. Spring, 7. Transmission sleeve, 8. Connecting screw, 9. Cover seal ring, 10. Rotating shaft. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0030] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] In the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" 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 limiting the scope of protection of this utility model.

[0032] The terms "first," "second," etc., used in this utility model are merely for clarity of description and are not intended to limit any order or emphasize importance. Furthermore, the term "connection" as used herein, unless otherwise specified, can refer to a direct connection or an indirect connection via other components.

[0033] Example

[0034] like Figures 1-3 As shown, this embodiment provides a carbon ring sealing structure for an ultra-large diameter air compressor, including a bushing 2, a sealing cover 5, and several carbon rings 3. The bushing 2 is fitted onto a rotating shaft 10; the sealing cover 5 is provided with an airflow sealing channel; the carbon rings 3 are buoyantly fitted onto the bushing 2 and located within the inner cavity of the sealing cover 5. An air film sealing groove is provided on the inner side of the carbon rings 3, and the air film sealing groove communicates with the airflow sealing channel. By isolating unqualified external air with dry gas, and because the carbon rings 3 and bushing 2 are in a floating seal (essentially non-contact), the wear of the carbon rings 3 is minimal during compressor operation, reducing the frequency of carbon ring 3 replacement and decreasing wind tunnel maintenance costs and downtime.

[0035] See Figures 1 to 3The airflow sealing channel includes an inlet channel 51 and an outlet channel 52, which extend radially along the sealing cover 5. A gap is provided between the inner side of the sealing cover 5 and the outer periphery of the bushing 2. The sealing cover 5 is fixedly connected to the compressor bracket. By extending the inlet channel 51 and outlet channel 52 radially along the sealing cover 5, dry air is easily guided into the air film sealing groove through the inlet channel 51. The outlet channel 52 allows airflow to exit along it, and the gap between the sealing cover 5 and the outer periphery of the bushing 2 prevents contact between the sealing cover 5 and the bushing 2 without affecting the sealing effect.

[0036] See Figures 1 to 3 The air film sealing groove includes a radial guide groove 32 and an annular groove 31. The radial guide groove 32 communicates with the annular groove 31, and the annular groove 31 extends along the inner wall of the carbon ring 3. The radial guide groove 32 extends along one side of the carbon ring 3 to the annular groove 31. By communicating the radial guide groove 32 with the annular groove 31, it is convenient for the drying airflow to enter the annular groove 31 from the radial guide groove 32. The annular groove 31 extends along the inner wall of the carbon ring 3, which facilitates the formation of vortices at the annular groove 31 of the carbon ring 3 when the rotating shaft 10 is stationary, and the formation of an air film with a certain rigidity at the annular groove 31 of the carbon ring 3 when the shaft rotates, so that the carbon ring 3 and the rotating shaft 10 remain basically concentric.

[0037] See Figures 1 to 3 Several radial guide grooves 32 are provided on the same carbon ring 3, and all of the radial guide grooves 32 are located on one side of the carbon ring 3. Positioning the radial guide grooves 32 on one side of the carbon ring 3 ensures that the airflow direction for forming the gas film is consistent, avoids airflow turbulence, and ensures the sealing effect of the gas film.

[0038] See Figures 1 to 3 The inlet ends of the radial guide grooves 32 on both sides of the air intake channel 51 face the air intake channel 51, and the inlet ends of the radial guide grooves 32 on the side of the air outlet channel 52 away from the air intake channel 51 face the air intake channel 51. By providing carbon rings 3 on both sides of the air intake channel 51, dry air entering from the air intake channel 51 is prevented from directly entering the air outlet channel 52, which would affect the sealing effect and reduce air consumption.

[0039] See Figures 1 to 3 The inner side of the sealing cap 5 is provided with several annular mounting grooves, and each annular mounting groove is equipped with a limiting baffle 4. Each carbon ring 3 is located in the corresponding annular mounting groove. By setting the limiting baffle 4, which is composed of several petals, it is convenient to install the carbon ring 3 first and provide sufficient installation space for the carbon ring 3.

[0040] See Figures 1 to 3 The carbon ring 3 is a segmented carbon ring 3, with a groove on the outer circumference of each segment. The segments of the carbon ring 3 are held together by a spring 6, which is circular in shape and located within the groove. By setting the carbon ring 3 into multiple segments and holding them together with the spring 6, the restoring force of the spring 6 can maintain a certain gap between the carbon ring 3 and the bushing 2 even after some wear on the inner side of the carbon ring 3. The gap is determined by a combination of factors such as temperature and shaft diameter.

[0041] See Figures 1 to 3 The inner side of the bushing 2 is provided with several sealing ring mounting grooves, and each sealing ring mounting groove is fitted with a bushing sealing ring 1. By providing several bushing sealing rings 1 on the inner side of the bushing 2, leakage of medium-side air from between the bushing 2 and the rotating shaft is prevented.

[0042] See Figures 1 to 3 The sealing cap 5 has an installation groove at one end connected to the compressor bracket, and a cap sealing ring 9 is installed in the installation groove. By providing a cap sealing ring 9 at the end of the sealing cap 5 connected to the compressor bracket, atmospheric airflow is prevented from entering the compressor from the connection between the sealing cap 5 and the compressor bracket.

[0043] See ​ It also includes a transmission sleeve 7, which is sleeved on the rotating shaft 10. The transmission sleeve 7 is fixedly connected to the end of the rotating shaft 10 on the atmospheric side by connecting screws 8. A protrusion is provided on one side of the transmission sleeve 7, and a groove that mates with the protrusion is provided at one end of the bushing 2. By setting the transmission sleeve 7 and fixing it to the rotating shaft 10, and by providing a protrusion on one side of the transmission sleeve 7 and a groove that mates with the protrusion at one end of the bushing 2, relative rotation between the bushing 2 and the rotating shaft 10 is prevented.

[0044] During operation, dry gas enters through the inlet channel 51 of the sealing gland 5, flowing evenly and smoothly into the radial guide groove 32. The gas rapidly diffuses along the radial guide groove 32 into the annular groove 31 inside the carbon ring 3. During this process, as the gas continuously fills the annular groove 31, a uniform and stable gas film gradually forms between the carbon ring 3 and the bushing 2. During compressor operation, the bushing 2 rotates at high speed with the rotating shaft 10. Due to the clamping action of the spring 6, the carbon ring 3 can adapt to the rotational movement of the bushing 2 to a certain extent, maintaining a relatively stable gap with the bushing 2, thus ensuring the continuous and stable existence of the gas film. Driven by the pressure difference, the gas entering the gas film flows back into the radial guide groove 32 from the inlet end of the radial guide groove 32 on the side of the outlet channel 52 away from the inlet channel 51, and finally flows out of the sealing structure from the outlet channel 52. This forms a complete airflow circulation path, ensuring the sealing effect while achieving orderly gas flow and pressure balance regulation.

[0045] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A carbon ring sealing structure for an ultra-large shaft diameter air compressor, characterized in that, include: A bushing, which is fitted onto the rotating shaft; A sealing gland, wherein the sealing gland is provided with an airflow sealing channel; Several carbon rings are buoyantly fitted onto the bushing and located within the inner cavity of the sealing gland. An air film sealing groove is provided on the inner side of each carbon ring, and the air film sealing groove communicates with the airflow sealing channel.

2. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 1, characterized in that, The airflow sealing channel includes an inlet channel and an outlet channel, which extend radially along the sealing cover. A gap is provided between the inner side of the sealing cover and the outer periphery of the bushing. The sealing cover is fixedly connected to the compressor bracket.

3. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 2, characterized in that, The air film sealing groove includes a radial guide groove and an annular groove. The radial guide groove communicates with the annular groove. The annular groove extends along the inner sidewall of the carbon ring, and the radial guide groove extends along one side of the carbon ring to the annular groove.

4. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 3, characterized in that, Several radial guide grooves are provided on the same carbon ring, and the several radial guide grooves are all located on one side of the carbon ring.

5. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 3, characterized in that, The inlet ends of the radial guide grooves on both sides of the air intake channel are all facing the air intake channel, and the inlet end of the radial guide groove on the side of the air outlet channel away from the air intake channel is facing the air intake channel.

6. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 1, characterized in that, The inner side of the sealing gland is provided with several annular mounting grooves, and each annular mounting groove is equipped with a limit baffle. Each carbon ring is located in the corresponding annular mounting groove.

7. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 6, characterized in that, The carbon ring is a segmented carbon ring, with a groove on the outer circumference of each segment. Several segments of the carbon ring are held together by a spring, and the spring as a whole is circular and located within the groove.

8. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 1, characterized in that, The inner side of the bushing is provided with several sealing ring mounting grooves, and a bushing sealing ring is installed in each of the sealing ring mounting grooves.

9. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to claim 1, characterized in that, The sealing gland is provided with an installation groove at one end where it is connected to the compressor bracket, and a gland sealing ring is installed in the installation groove.

10. The carbon ring sealing structure for an ultra-large shaft diameter air compressor according to any one of claims 1-9, characterized in that, It also includes a transmission sleeve, which is sleeved on the rotating shaft. The transmission sleeve is fixedly connected to the end of the rotating shaft on the atmospheric side by connecting screws. A protrusion is provided on one side of the transmission sleeve, and a groove that mates with the protrusion is provided at one end of the bushing.

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