CN113915147A - Floating seal assembly, compressor and refrigeration equipment - Google Patents

Abstract

The invention discloses a floating seal assembly, a compressor and refrigeration equipment, and relates to the technical field of compressors. A floating seal assembly is arranged in a gap between a movable part and a fixed part matched with the movable part, and specifically comprises at least one floating seal unit which can be connected in a stacking manner, wherein the floating seal unit comprises a supporting seat, an elastic part is arranged on the supporting seat along the stacking direction, and a sealing part used for sealing the gap is arranged at one end of the elastic part, which is far away from the supporting seat; when the supporting seat in the floating sealing unit is connected with the fixing piece, the supporting seat of the floating sealing unit is provided with a fixing part connected with the fixing piece. The sealing element structure between the moving part and the fixed part is simplified, and the sealing effect of the sealing element is improved.

Description

Floating seal assembly, compressor and refrigeration equipment

Technical Field

The invention relates to the technical field of compressors, in particular to a floating seal assembly, a compressor and refrigeration equipment.

Background

The centrifugal compressor has wide application, such as chemical industry, petroleum refining industry, refrigeration industry and the like, the working principle of the centrifugal compressor is to apply work to gas through an impeller to realize energy conversion, when the gas flows through an impeller of a centrifugal compression device, the impeller rotating at high speed enables the gas to be improved in pressure and speed under the action of centrifugal force, namely, the centrifugal compressor converts mechanical energy into static pressure energy and kinetic energy of the gas by utilizing the impeller, and the gas is continuously compressed and accelerated under the action of a multi-stage impeller to obtain higher gas pressure energy. A gap is formed between the wheel cover of the impeller and the volute for fixing the impeller, and the gas enters through the air suction port of the impeller, becomes high-pressure high-temperature gas after the impeller works, and enters the volute through the air exhaust port. Because the exhaust port gas is the high pressure side, the gas leaks along the gap between the shroud of the impeller and the volute housing where the impeller is fixed. The air between the air suction port and the air exhaust port of the impeller is caused to move, turbulence is formed, energy is consumed, and the energy efficiency of the centrifugal compressor is reduced. There is also a gap between the impeller and diffuser, motor shaft, which cannot be closed completely, and this gap also causes leakage losses.

In order to reduce the amount of leakage air passing between the impeller and the stationary element, a sealing structure is required. The scheme that the broach is sealed is adopted to current structure more, and the broach structure is fixed, and sealed effect is poor and be not convenient for maintain. Therefore, how to simplify the structure of the sealing element and improve the sealing effect of the sealing element becomes a technical problem to be solved urgently.

Disclosure of Invention

The invention mainly aims to provide a floating seal assembly, a compressor and refrigeration equipment, aiming at simplifying the structure of a sealing element between a movable element and a fixed element and improving the sealing effect of the sealing element.

In order to achieve the above object, the present invention provides a floating seal assembly, which is disposed in a gap between a movable member and a fixed member engaged therewith, and includes at least one floating seal unit capable of being stacked and connected, where the floating seal unit includes a support seat, an elastic member is disposed on the support seat along a stacking direction, and a sealing member for sealing the gap is disposed on an end of the elastic member away from the support seat; when the supporting seat in the floating sealing unit is connected with the fixing piece, the supporting seat of the floating sealing unit is provided with a fixing part connected with the fixing piece.

In an embodiment of the present application, the supporting seat and the sealing element are annular, and a radial width of the sealing element is adapted to the width of the gap.

In an embodiment of the present application, at least three elastic members are disposed between the supporting seat and the sealing member.

In an embodiment of the present application, the elastic member is a compression spring.

In an embodiment of the present application, a rounded corner is disposed on a side of the sealing member adjacent to the movable member.

In an embodiment of the present application, an elastic compensation element is disposed on a side of the sealing element away from the movable element.

The application also discloses a compressor, including the closed impeller and with closed impeller matched with spiral case, the closed impeller with be equipped with as above arbitrary one between the spiral case the floating seal subassembly, wherein the fixed part is fixed in on the spiral case.

In an embodiment of the present application, a diffuser that is fitted to the closed impeller is provided with a bleed air sealing structure for sealing a gap between the diffuser and the impeller.

In an embodiment of the present application, the bleed air sealing structure includes a plurality of injection cavities, where injection pressure is greater than a preset threshold, and openings of the injection cavities are uniformly distributed on one side of the air outlet of the closed impeller; the spraying device is characterized in that an annular liquid storage cavity communicated with the plurality of spraying cavities is arranged below the spraying cavities, a sealing plate is arranged at the bottom of the annular liquid storage cavity, and a liquid inlet communicated with the annular liquid storage cavity is formed in the sealing plate.

In an embodiment of the application, a sealing rubber ring is arranged at the joint of the sealing plate and the annular liquid storage cavity.

In one embodiment of the present application, the spray chamber is flared and has an inner diameter that decreases in sequence in the direction from the annular reservoir to the canned impeller.

In an embodiment of the present application, an included angle between an inner wall of the injection cavity and a side of the diffuser close to the closed impeller is an acute angle.

In an embodiment of the application, the acute angle α is 30 ° < α < 80 °.

In one embodiment of the application, the jet orifice diameter R of the jet cavity is less than 1 mm.

The application also discloses a refrigeration device, which comprises the compressor.

In an embodiment of the application, the refrigeration device comprises an air conditioner.

By adopting the technical scheme, the supporting seat is fixed on the fixing part through the fixing part, the elastic part is connected to one side of the gap between the fixing part and the moving part on the supporting seat, the sealing part is arranged at one end, away from the supporting seat, of the elastic part, and the sealing part and the outer side wall of the moving part are mutually matched to seal the gap. The structure of the sealing element between the movable part and the fixed part is simplified, and the sealing effect of the sealing element is improved.

Drawings

The invention is described in detail below with reference to specific embodiments and the attached drawing figures, wherein:

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

fig. 3 is an enlarged schematic view of a portion B in fig. 1.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.

As shown in fig. 1 to fig. 3, in order to achieve the above object, the present invention provides a floating seal assembly, disposed in a gap between a movable member and a fixed member engaged therewith, including at least one floating seal unit capable of being connected in a stackable manner, where the floating seal unit includes a support seat 31, an elastic member 32 is disposed on the support seat 31 along a stacking direction, and a sealing member 33 for sealing the gap is disposed on an end of the elastic member 32 away from the support seat 31; when the support seat 31 of the floating seal unit is connected to the fixing member, the support seat 31 of the floating seal unit is provided with a fixing portion 311 connected to the fixing member.

The floating seal assembly is arranged in a gap between a movable part and a fixed part matched with the movable part and used for sealing the gap. At least one floating seal unit is included, and when one floating seal unit is provided, the floating seal unit is directly arranged in the gap to seal the gap. When the number of the floating seal units is two or more, the floating seal units are firstly stacked and connected with each other and then arranged in the gap, so that the sealing effect on the gap is further improved. The floating seal units in this application are preferably four.

The floating seal unit includes a support 31, an elastic member 32 is disposed on the support 31 along a stacking direction, a sealing member 33 is connected to an end of the elastic member 32 away from the support 31, the sealing member 33 is used for sealing a gap between the movable member and the stationary member, and when one of the support 31 of the floating seal unit needs to be fixed on the stationary member, a fixing portion 311 is correspondingly disposed on the support 31.

By adopting the above technical scheme, the supporting seat 31 is fixed on the fixed part through the fixing part 311, the elastic member 32 is connected to the side of the supporting seat 31 facing the gap between the fixed part and the movable part, the sealing member 33 is arranged at the end of the elastic member 32 far away from the supporting seat 31, and the sealing member 33 and the outer side wall of the movable part are mutually matched to seal the gap. The structure of the sealing member 33 between the movable member and the fixed member is simplified, and the sealing effect of the sealing member 33 is improved.

In an embodiment of the present application, the support seat 31 and the sealing element 33 are annular, and the radial width of the sealing element is adapted to the width of the gap.

Specifically, the supporting seat 31 and the sealing element 33 are both annular, the movable element can be wrapped by the annular supporting seat 31 and the annular sealing element 33, a gap between the movable element and the fixed element can be completely sealed, and the sealing effect of the sealing element 33 is further improved. It is conceivable that the annular shapes of the support seat 31 and the sealing member 33 correspond one-to-one to the shape of the gap in order to ensure that the sealing member 33 can seal the gap between the mover and the stator.

By adopting the technical scheme, the sealing effect of the sealing element 33 is further improved.

In an embodiment of the present application, at least three elastic members 32 are disposed between the supporting seat 31 and the sealing member 33.

Specifically, three elastic members 32 are arranged between the supporting seat 31 and the sealing member 33, so that the sealing effect of the sealing member 33 is prevented from being influenced by excessive resistance of the elastic members 32 while a stable distance is maintained between the supporting seat 31 and the sealing member 33.

Of course, the number of the elastic members 32 may be four, five, six, etc. according to the design requirement, and the number of the elastic members 32 is uniformly distributed between the supporting seat 31 and the sealing member 33, so as to ensure the stability of the distance between the supporting seat 31 and the sealing member 33.

By adopting the technical scheme, the three elastic pieces 32 are arranged between the supporting seat 31 and the sealing piece 33, so that the stable distance between the supporting seat 31 and the sealing piece 33 is ensured, and meanwhile, the influence of the elastic pieces 32 on the sealing performance of the sealing piece 33 is also avoided.

In one embodiment of the present application, the elastic member 32 is a compression spring.

In an embodiment of the present application, the sealing member 33 has a rounded corner on a side thereof adjacent to the movable member.

Specifically, a round corner is arranged on one side, close to the movable piece, of the sealing piece 33, so that friction between the sealing piece 33 and the outer side wall of the movable piece is reduced, and loss of the sealing piece 33 is reduced. The seal 33 in the present application is a carbon ring.

In an embodiment of the present application, the sealing element 33 is provided with an elastic compensation element on the side facing away from the movable element.

In particular, a compensation ring 34 is provided on the side of the sealing element 33 remote from the movable side for sealing between the sealing element 33 and the fixed element, which further improves the sealing effect of the sealing element 33.

The application also discloses a compressor, including closed impeller 10 and with closed impeller 10 matched with spiral case 20, closed impeller 10 with be equipped with as above arbitrary one between the spiral case 20 the floating seal subassembly, wherein fixed part 311 is fixed in on the spiral case 20.

Specifically, the compressor includes closed impeller 10, and with closed impeller 10 matched with spiral case 20, spiral case 20 wraps up closed impeller 10 in it to leave the gap between the lateral wall with closed impeller 10, in order to guarantee the rotation that closed impeller can be stable, the gap department between the lateral surface of closed impeller and spiral case 20 is provided with the floating seal subassembly, the fixed part 311 of floating seal subassembly is fixed on spiral case 20, the sealing member 33 of floating seal subassembly, the carbocycle setting is in the gap that is located between spiral case 20 and closed impeller 10 promptly, realize the sealing to this gap.

In the floating seal assembly, during the high-speed rotation of the closed impeller, gas forms a gas mold between the carbon ring and the impeller cover, so that throttling depressurization is generated, and the high-speed high-pressure gas at the outlet of the closed impeller 10 is prevented from flowing to the low-pressure side. In the using process, because the weight of the floating seal assembly is very small, when the closed impeller 10 rotates, the air mould in the gap lifts the floating seal assembly, so that the eccentricity of the floating seal assembly is reduced, and when the eccentricity is reduced to a balance state, the buoyancy of the air flow is equal to the weight of the floating ring, thereby achieving dynamic balance.

In an embodiment of the present application, a diffuser 50 that is coupled to the closed impeller 10 is provided with a bleed air sealing structure for sealing a gap between the diffuser 50 and the impeller.

Specifically, the diffuser 50 matched with the closed impeller is provided with the air-entraining sealing structure, and a gap between the diffuser 50 and the closed impeller is sealed through the air-entraining sealing structure, so that the overflow of high-pressure and high-speed gas in the compressor is further reduced.

In an embodiment of the present application, the bleed air sealing structure includes a plurality of injection cavities 41 with injection pressures greater than a preset threshold value, which are disposed in the diffuser 50, and openings of the injection cavities 41 are uniformly distributed on one side of the air outlet of the closed impeller 10; an annular liquid storage cavity 42 communicated with the plurality of injection cavities 41 is arranged below the injection cavities 41, a sealing plate 43 is arranged at the bottom of the annular liquid storage cavity 42, and a liquid inlet 44 communicated with the annular liquid storage cavity 42 is formed in the sealing plate 43.

Specifically, the bleed air sealing structure includes a plurality of injection cavities 41 arranged in the diffuser 50, the injection pressure at the opening of the injection cavity 41 is greater than a preset threshold value, the openings of the injection cavities 41 are uniformly distributed on one side of the air outlet of the sealed impeller, and the number of the injection cavities 41 is at least sixteen. An annular liquid storage cavity 42 is formed in the diffuser 50, and the annular liquid storage cavity 42 communicates with all the injection cavities 41, so that the injection cavities 41 can be synchronously and stably supplied with injection liquid. The bottom in annular stock solution chamber 42 is equipped with the sealed closing plate 43 in annular stock solution chamber 42, passes through the screwed connection between closing plate 43 and the diffuser 50, adopts the mode of screwed connection to connect, the dismantlement and the maintenance in the later stage of being convenient for. A liquid inlet 44 for supplying liquid to the annular liquid storage chamber 42 is provided in the seal plate 43. In this application, the liquid injected from the injection cavity 41 is a gas-liquid mixed refrigerant.

By adopting the technical scheme, the annular liquid storage cavity 42 continuously provides the refrigerant with the pressure greater than the preset pressure for the injection cavity 41, so that the high-pressure sealing is realized for the closed impeller 10, and the leakage loss is avoided.

In an embodiment of the present application, a sealing rubber ring 45 is disposed at a connection position of the sealing plate 43 and the annular liquid storage cavity 42.

Specifically, set up sealing rubber ring 45 at the junction of closing plate 43 and annular stock solution chamber 42, realize the sealed of annular stock solution chamber 42, avoid appearing revealing, improved the leakproofness to the sealing chamber.

In one embodiment of the present application, the spray chamber 41 is flared and has an inner diameter that decreases in the direction from the annular reservoir chamber 42 to the canned impeller.

Specifically, the trumpet-shaped injection cavity 41 is adopted, so that gas-liquid mixed refrigerants can be fully mixed during injection, the sealing performance is improved, and the noise during working is reduced.

In an embodiment of the present application, an included angle between the inner wall of the injection chamber 41 and a side of the diffuser 50 close to the closed impeller 10 is an acute angle.

Specifically, an included angle between the inner wall of the injection cavity 41 and the side, close to the closed impeller 10, of the diffuser 50 is set to be an acute angle, so that the influence of the air flow from the injection port of the injection cavity 41 on the air outlet of the closed impeller 10 is reduced.

In an embodiment of the application, the acute angle α is 30 ° < α < 80 °.

In one embodiment of the present application, the ejection orifice diameter R of the ejection chamber 41 is < 1 mm.

The application also discloses a refrigeration device, which comprises the compressor.

In an embodiment of the application, the refrigeration device comprises an air conditioner.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (16)

1. A floating seal assembly is arranged in a gap between a movable part and a fixed part matched with the movable part, and is characterized by comprising at least one floating seal unit which can be connected in a stacking way, wherein the floating seal unit comprises a supporting seat, an elastic part is arranged on the supporting seat along the stacking direction, and a sealing part used for sealing the gap is arranged at one end of the elastic part far away from the supporting seat; when the supporting seat in the floating sealing unit is connected with the fixing piece, the supporting seat of the floating sealing unit is provided with a fixing part connected with the fixing piece.

2. The floating seal assembly of claim 1 wherein said seat and said seal are annular, said seal having a radial width adapted to fit said gap width.

3. The floating seal assembly of claim 2 wherein at least three resilient members are disposed between said support seat and said seal.

4. The floating seal assembly of claim 1 wherein said resilient member is a compression spring.

5. The floating seal assembly of claim 1 wherein said seal member has a radius on a side thereof adjacent said movable member.

6. A floating seal assembly according to claim 1 wherein a resilient compensation member is provided on a side of said seal member remote from said movable member.

7. A compressor comprising a closed impeller and a volute housing fitted to the closed impeller, wherein a floating seal assembly as claimed in any one of claims 1 to 6 is provided between the closed impeller and the volute housing, and the fixing portion is fixed to the volute housing.

8. The compressor of claim 7, wherein a diffuser associated with the closed impeller is provided with a bleed air seal for sealing a gap between the diffuser and the impeller.

9. The compressor according to claim 8, wherein the bleed air closing structure comprises a plurality of injection cavities with injection pressure greater than a preset threshold value, which are arranged in the diffuser, and openings of the injection cavities are uniformly distributed on one side of the air outlet of the closed impeller; the spraying device is characterized in that an annular liquid storage cavity communicated with the plurality of spraying cavities is arranged below the spraying cavities, a sealing plate is arranged at the bottom of the annular liquid storage cavity, and a liquid inlet communicated with the annular liquid storage cavity is formed in the sealing plate.

10. The compressor of claim 9 wherein the seal plate is provided with a sealing rubber ring at the junction with the annular reservoir.

11. The compressor as set forth in claim 9, wherein said injection chamber is flared and has an inner diameter that decreases in a direction from said annular reservoir to said canned wheel.

12. The compressor of claim 9 wherein the angle between the inner wall of the injection chamber and the side of the diffuser adjacent the closed impeller is acute.

13. The compressor of claim 12, wherein the acute angle α is 30 ° < α < 80 °.

14. The compressor of claim 9, wherein the injection cavity has an injection port diameter R < 1 mm.

15. A refrigeration apparatus, characterized by comprising a compressor according to any one of claims 7 to 14.

16. The refrigeration appliance according to claim 15 wherein said refrigeration appliance comprises an air conditioner.

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