CN114439943B - Spiral seal structure and compressor - Google Patents
Spiral seal structure and compressor Download PDFInfo
- Publication number
- CN114439943B CN114439943B CN202210121458.7A CN202210121458A CN114439943B CN 114439943 B CN114439943 B CN 114439943B CN 202210121458 A CN202210121458 A CN 202210121458A CN 114439943 B CN114439943 B CN 114439943B
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- spiral
- accommodating cavity
- shaft
- groove
- rotating shaft
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- 239000007788 liquid Substances 0.000 claims abstract description 81
- 238000007789 sealing Methods 0.000 claims abstract description 32
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 23
- 238000005086 pumping Methods 0.000 description 15
- 230000004308 accommodation Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 7
- 230000002708 enhancing effect Effects 0.000 description 5
- 239000010432 diamond Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/12—Shaft sealings using sealing-rings
- F04D29/122—Shaft sealings using sealing-rings especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Devices (AREA)
Abstract
The invention provides a spiral sealing structure and a compressor, and relates to the technical field of spiral sealing. The screw seal structure includes a housing and a shaft assembly. A first accommodating cavity and a second accommodating cavity which are communicated are formed in the shell, the first accommodating cavity is used for accommodating liquid, and a through hole communicated with the second accommodating cavity is formed in the shell; the shaft assembly comprises a rotating shaft and a shaft sleeve, the rotating shaft sequentially penetrates through the through hole and the second accommodating cavity, at least part of the rotating shaft is located in the first accommodating cavity, the shaft sleeve is fixedly sleeved on the rotating shaft, the shaft sleeve located in the second accommodating cavity is axially provided with a plurality of spiral teeth at intervals, a spiral groove is formed between every two adjacent spiral teeth, a first groove is formed in each spiral tooth along the circumferential direction of each spiral tooth, and a second groove is formed in the end face, close to the first accommodating cavity, of the shaft sleeve. The spiral sealing structure reduces liquid leakage, improves sealing effect and effectively expands application range.
Description
Technical Field
The invention relates to the technical field of spiral sealing, in particular to a spiral sealing structure and a compressor.
Background
Screw seals are non-contact dynamic seals, also known as thread seals, that prevent leakage of liquid in a fluid machine by using a screw structure. In general, a screw thread is formed on a rotary shaft at a seal portion, and a space contained in the screw thread and a housing is filled with a leaked liquid during operation, thereby forming a "liquid nut". The direction of the screw thread on the shaft enables the liquid nut to generate axial movement when the shaft rotates, so that liquid is promoted to continuously return to the high-pressure end, and when the pressure generated by the axial movement of the liquid nut is balanced with the pressure of the high-pressure end, the liquid can be prevented from leaking, thereby realizing the function of spiral sealing. Spiral seals are generally suitable for use at any temperature, but are not suitable for use in applications where the liquid has a low viscosity, a high pressure differential, and an excessive rotational speed. Therefore, how to expand the application range of the spiral seal is a technical problem to be solved.
Disclosure of Invention
In view of the above, the present application aims to overcome the defects in the prior art, and provides a spiral sealing structure, so as to solve the technical problem that the application range of the spiral sealing structure is small because the spiral sealing structure in the prior art is only suitable for occasions with high liquid viscosity, low pressure difference and medium rotation speed.
The invention provides the following technical scheme:
A spiral seal, comprising:
The device comprises a shell, wherein a first accommodating cavity and a second accommodating cavity which are communicated are formed in the shell, the first accommodating cavity is used for accommodating liquid, and a through hole communicated with the second accommodating cavity is formed in the shell;
the shaft assembly comprises a rotating shaft and a shaft sleeve, the rotating shaft sequentially penetrates through the through hole, the second accommodating cavity is formed in the second accommodating cavity, at least part of the rotating shaft is located in the first accommodating cavity, the shaft sleeve is fixedly sleeved on the rotating shaft and located in the second accommodating cavity, a plurality of spiral teeth are arranged in the shaft sleeve at intervals along the axial direction of the shaft sleeve, spiral grooves are formed between every two adjacent spiral teeth, first grooves are formed in the spiral teeth along the circumferential direction of the spiral teeth, and second grooves are formed in the shaft sleeve, close to the end faces of the first accommodating cavity, of the second grooves.
In some embodiments of the present application, a third groove is formed in a cavity wall of the second accommodating cavity, and the third groove is disposed corresponding to the first groove.
In some embodiments of the present application, a shaft shoulder is disposed at one end of the rotating shaft, an end surface of the shaft shoulder abuts against an end surface of the shaft sleeve, a plurality of fourth grooves are formed in the shaft shoulder, and the plurality of fourth grooves are disposed at intervals along a circumferential direction of the shaft shoulder.
In some embodiments of the application, the included angle between the spiral line of the spiral groove and the axis of the rotating shaft is 30-60 degrees.
In some embodiments of the application, the helical teeth have an outer diameter less than an inner diameter of the second receiving chamber, and the end face of the sleeve is flush with the end face of the housing.
In some embodiments of the application, the cross-sectional shape of the first groove and the third groove is W-shaped or U-shaped, and the cross-sectional shape of the second groove and the fourth groove is regular hexagon, circle, trapezoid, or diamond.
In some embodiments of the present application, the spiral seal structure further includes a retainer ring, where the retainer ring is located at an end of the rotating shaft away from the first accommodating cavity, and abuts against an end surface of the housing.
In some embodiments of the present application, the spiral seal further includes a fastener, the retainer ring and the housing form a counterbore, and the fastener is inserted through the counterbore to fixedly connect the retainer ring and the housing.
In some embodiments of the present application, the spiral sealing structure further includes a sealing ring sleeved on the rotating shaft and located between the shaft sleeve and the retainer ring.
The application also provides a compressor comprising the spiral sealing structure.
Embodiments of the present invention have the following advantages:
the application provides a spiral sealing structure, which is characterized in that a first groove and a second groove are respectively arranged on a shaft sleeve to interfere the flowing of liquid in the leakage direction, so that the flowing energy of the liquid is consumed, and the rotation of a spiral groove and a spiral tooth on the shaft sleeve is matched to prevent the liquid in a first accommodating cavity from leaking to the outside through a second accommodating cavity and a through hole. The first groove increases the contact area between the liquid and the circumferential surface of the shaft sleeve, plays roles of turbulence, throttling and vortex, the second groove increases the contact area between the liquid and the end surface of the shaft sleeve, reduces the pressure intensity of the end surface of the shaft sleeve, improves the bearing pressure of the shaft sleeve, plays roles of turbulence, throttling and vortex, and consumes the flow energy of the liquid. Through setting up first recess and second recess, consumed the first flow energy that holds intracavity liquid and to the external world and reveal through second holds chamber and through-hole, reduced the liquid and revealed, improved the sealed effect of screw seal for screw seal also can use under the equal moderate occasion of differential pressure, liquid viscosity and rotational speed, and have good sealed effect, enlarged the application range of screw seal, avoided the screw seal among the prior art only to be applicable to the occasion that liquid viscosity is great, differential pressure is less and moderate rotational speed, lead to its application range less technical problem.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 illustrates a schematic cross-sectional view of a spiral seal in accordance with some embodiments of the present application;
FIG. 2 illustrates another cross-sectional view of a spiral seal in some embodiments of the present application;
FIG. 3 illustrates an enlarged cross-sectional view of a shaft assembly in accordance with some embodiments of the application;
FIG. 4 illustrates a schematic front view of a shaft assembly in accordance with some embodiments of the application;
FIG. 5 illustrates a side view schematic of a shaft assembly in accordance with some embodiments of the application.
Description of main reference numerals:
100-spiral seal structure; 10-a housing; 101-a first accommodation chamber; 102-a second accommodation chamber; 1021-a third groove; 103-through holes; a 20-axis assembly; 201-rotating shaft; 2011-a shaft shoulder; 2012-fourth grooves; 202-shaft sleeve; 2021-helical groove; 2022-helical teeth; 2023-first groove; 2024-second groove; 30-check ring; 301-countersink; 40-sealing rings; 50-liquid.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1 to 5, an embodiment of the present application provides a screw seal structure 100, mainly for use in a compressor, the screw seal structure 100 including a housing 10 and a shaft assembly 20.
The housing 10 defines a first accommodating cavity 101 and a second accommodating cavity 102, wherein the first accommodating cavity 101 is used for accommodating the liquid 50, and a through hole 103 communicated with the second accommodating cavity 102 is formed in the housing 10. The shaft assembly 20 comprises a rotating shaft 201 and a shaft sleeve 202, the rotating shaft 201 sequentially penetrates through the through hole 103 and the second accommodating cavity 102, at least part of the rotating shaft 201 is located in the first accommodating cavity 101, the shaft sleeve 202 is fixedly sleeved on the rotating shaft 201 and located in the second accommodating cavity 102, a plurality of spiral teeth 2022 are arranged on the shaft sleeve 202 at intervals along the axial direction of the shaft sleeve, spiral grooves 2021 are formed between every two adjacent spiral teeth 2022, first grooves 2023 are formed in the spiral teeth 2022 along the circumferential direction of the spiral teeth, and second grooves 2024 are formed in the shaft sleeve 202 and close to the end face of the first accommodating cavity 101.
In the spiral sealing structure 100 provided by the embodiment of the application, a first accommodating cavity 101 and a second accommodating cavity 102 which are mutually communicated are arranged in a shell 10, the first accommodating cavity 101 is used for accommodating liquid 50, and a through hole 103 which is communicated with the second accommodating cavity 102 is formed in the shell 10. Wherein the second accommodation chamber 102 communicates with the first accommodation chamber 101 and the outside through the through hole 103, respectively. The shaft assembly 20 sequentially penetrates through the through hole 103 and the second accommodating cavity 102, and at least part of the rotating shaft 201 is located in the first accommodating cavity 101, so that the shaft assembly is placed in the first accommodating cavity 101 and the second accommodating cavity 102 and can rotate along the axis of the shaft assembly. The shaft assembly 20 is composed of a shaft sleeve 202 and a rotating shaft 201, wherein the shaft sleeve 202 is fixedly sleeved on the rotating shaft 201 and is in interference fit or key connection with the rotating shaft 201, so that stable connection is realized, and the rotating shaft 201 can drive the shaft sleeve 202 to synchronously rotate.
Specifically, the sleeve 202 is located in the second accommodating cavity 102, and a plurality of spiral teeth 2022 are disposed on the sleeve 202 at intervals along the axial direction thereof, a spiral groove 2021 is formed between two adjacent spiral teeth 2022, and the spiral direction of the spiral teeth 2022 and the spiral groove 2021 may be left-handed or right-handed. When the rotation direction is left-handed, the rotation shaft 201 and the sleeve 202 need to be rotated counterclockwise, and when the rotation direction is right-handed, the rotation shaft 201 and the sleeve 202 need to be rotated clockwise so that the rotation direction thereof faces the first accommodating chamber 101. The spiral teeth 2022 and the spiral grooves 2021 on the shaft sleeve 202 rotate to form a screw pump, and by utilizing the principle of the screw pump, a pumping action can be generated to generate axial thrust towards the first accommodating cavity 101 on the leaked liquid 50 filled in the space formed by the second accommodating cavity 102 and the shaft sleeve 202, so that the liquid 50 is driven to generate axial movement opposite to the leakage direction of the liquid 50, the leaked liquid 50 is driven back to the first accommodating cavity 101, and the liquid 50 in the first accommodating cavity 101 is prevented from leaking to the outside through the second accommodating cavity 102 and the through hole 103. When the pumping action produces a pumping flow equal to the flow of liquid 50 leakage, liquid 50 is prevented from leaking, thereby achieving a seal against liquid 50. Of course, when the pumping flow rate generated by the pumping action is larger than the leakage flow rate of the liquid 50, the leakage of the liquid 50 can be prevented, and the sealing effect is better. The reason why the liquid 50 leaks is that the pressure in the first accommodating chamber 101 is greater than the pressure of the outside, so that the liquid 50 leaks from the high pressure end in the first accommodating chamber 101 to the low pressure end of the outside through the leakage gap. Accordingly, when the pumping pressure generated by the rotation of the screw grooves 2021 and the screw teeth 2022 is equal to the pressure in the first accommodation chamber 101, the internal and external pressures are balanced, thereby achieving prevention of leakage of the liquid 50. Of course, when the pumping pressure generated by the rotation of the spiral groove 2021 and the spiral tooth 2022 is greater than the pressure in the first accommodating cavity 101, the leakage of the liquid 50 can be prevented, and the sealing effect is better.
The shaft sleeve 202 is further provided with a first groove 2023 and a second groove 2024, and the first groove 2023 and the second groove 2024 are used for enabling the liquid 50 to generate vortex, turbulence, throttling and turbulence effects so as to interfere the flowing of the liquid 50 in the leakage direction, and the first groove 2023 and the second groove 2024 serve as expansion chambers so as to consume the flowing energy of the liquid 50 in the leakage direction, reduce leakage and improve the sealing effect. And cooperates with the rotation of the screw grooves 2021 and screw teeth 2022 on the sleeve 202 to prevent the liquid 50 in the first accommodating chamber 101 from leaking to the outside through the second accommodating chamber 102 and the through hole 103. The first groove 2023 is disposed on a circumferential surface of the helical tooth 2022, and the second groove 2024 is disposed on an end surface of the sleeve 202. The first groove 2023 increases the contact area between the liquid 50 and the circumferential surface of the shaft sleeve 202, and plays roles of turbulence, throttling and vortex, the second groove 2024 increases the contact area between the liquid 50 and the end surface of the shaft sleeve 202, reduces the pressure on the end surface of the shaft sleeve 202, and improves the bearing pressure of the shaft sleeve 202, and plays roles of turbulence, throttling and vortex, so that the flow energy of the liquid 50 is consumed. Through setting up first recess 2023 and second recess 2024, consumed the flow energy that liquid 50 in the first chamber 101 that holds in the chamber 101 was held to the outside through the second and is leaked, reduced the leakage of liquid 50, improved the sealed effect of screw seal for screw seal also can use under the equal moderate occasion of pressure differential, liquid 50 viscosity and rotational speed, and have good sealed effect, enlarged the application range of screw seal, avoided the screw seal among the prior art only to be applicable to the occasion that liquid 50 viscosity is great, pressure differential is less and moderate rotational speed, lead to its application range less technical problem.
As shown in fig. 1 and 2, in an embodiment of the present application, optionally, a third groove 1021 is formed on a cavity wall of the second accommodating cavity 102, and the third groove 1021 is disposed corresponding to the first groove 2023.
In the present embodiment, the chamber wall of the second accommodation chamber 102 is provided with a third groove 1021 corresponding to the first groove 2023. The third groove 1021 increases the contact area between the liquid 50 and the wall of the second accommodating chamber 102, which is equivalent to increasing the volume of the expansion chamber, and further consumes the energy of the liquid 50 flowing in the leakage direction in combination with the first groove 2023, thereby further enhancing the turbulence, throttling and vortex effects, reducing the leakage of the liquid 50, and improving the sealing effect.
As shown in fig. 1, 2 and 3, in the foregoing embodiment of the present application, optionally, a shaft shoulder 2011 is disposed at one end of the rotating shaft 201, an end surface of the shaft shoulder 2011 abuts against an end surface of the shaft sleeve 202, a plurality of fourth grooves 2012 are formed in the shaft shoulder 2011, and a plurality of fourth grooves 2012 are disposed at intervals along a circumferential direction of the shaft shoulder 2011.
In this embodiment, a shaft shoulder 2011 is disposed at one end of the rotating shaft 201, and an end surface of the shaft sleeve 202 abuts against an end surface of the shaft shoulder 2011, so as to prevent the shaft sleeve 202 from axially moving relative to the rotating shaft 201 during rotation, and perform a limiting function, so that the shaft sleeve 202 is firmly connected with the rotating shaft 201. A fourth groove 2012 is provided in the circumferential direction of the shoulder 2011. Wherein, fourth recess 2012 increases the contact area of the circumferential surface of shoulder 2011 with liquid 50, enhancing turbulence, swirl and throttling action on liquid 50. The fourth recess 2012 can be provided with a plurality of, and a plurality of fourth recesses 2012 set up along the circumference interval of shaft shoulder 2011, through increasing the quantity of fourth recess 2012 to further strengthen vortex, vortex and throttling effect, thereby further reduce liquid 50 and reveal, improve sealed effect, make spiral seal also can use under the equal moderate occasion of pressure differential, liquid 50 viscosity and rotational speed, and have good sealed effect, enlarged spiral seal's application range.
In one embodiment of the present application, the angle between the spiral line of the spiral groove 2021 and the axis of the rotating shaft 201 is optionally 30-60 degrees.
In this embodiment, the angle between the spiral line of the spiral groove 2021 and the axis of the rotating shaft 201 is between 30 degrees and 60 degrees. Specifically, the angle between the spiral line and the axis has a significant effect on the pumping capacity generated by the rotation of the spiral groove 2021, so that the spiral line and the axis can be selected to be any value between 30 degrees and 60 degrees for proper pumping capacity and processing of the spiral groove 2021 and the spiral tooth 2022. Illustratively, when the included angle is 30 degrees, the helix of the helical groove 2021 is more inclined, closer to the axis, increasing the axial component, decreasing the radial component, and allowing for greater axial thrust, thereby enhancing axial pumping, as the helical groove 2021 rotates to maximize pumping capacity. At an included angle of 60 degrees, the helix of the helical groove 2021 is farther from the axis, increasing the axial component force and increasing the radial component force, resulting in a reduction in axial thrust and thus a reduction in axial pumping action, while the helical groove 2021 rotates to a minimum pumping capacity. When the included angle is 45 degrees, the pumping capacity generated by the rotation of the spiral groove 2021 is smaller than that when the included angle is 30 degrees and larger than that when the included angle is 60 degrees. Of course, the included angle between the spiral and the axis may take any value between greater than 0 degrees and less than 90 degrees, provided that the housing 10 is workable and has a relatively thick thickness. The pitch may be selected based on the amount of leakage of the liquid 50, the viscosity, the rotational speed of the shaft 201, and the internal and external pressure differences.
In an embodiment of the application, as shown in fig. 1,2 and 4, optionally, the outside diameter of the screw teeth 2022 is smaller than the inside diameter of the second receiving chamber 102, and the end face of the sleeve 202 is flush with the end face of the housing 10.
In this embodiment, the outside diameter of the screw tooth 2022 is smaller than the inside diameter of the second accommodation chamber 102. Specifically, the outside diameter of screw tooth 2022 is slightly smaller than the inside diameter of second receiving chamber 102 to enable shaft assembly 20 to rotate within second receiving chamber 102 and to enable shaft sleeve 202 to form a small leakage gap with the chamber walls of second receiving chamber 102 for liquid 50 within first receiving chamber 101 to leak into second receiving chamber 102 through the gap. It should be noted that, if the leakage gap is too large, the liquid 50 is only attached to the wall of the second accommodating cavity 102 and separated from the spiral groove 2021 on the shaft sleeve 202, so that the spiral groove 2021 cannot generate vortex and pumping action on the leaked liquid 50 when rotating, and the leaked liquid 50 cannot be driven to return to the first accommodating cavity 101, so that the spiral seal is disabled. The leakage gap cannot be too small, and if the leakage gap is too small, the shaft assembly 20 is easy to collide with the cavity wall of the second accommodating cavity 102 when rotating, so that the abrasion is caused, and the service life of the shaft assembly is reduced. The end face of the sleeve 202 is flush with the end face of the housing 10 such that the sleeve 202 is fully seated within the second receiving chamber 102.
As shown in fig. 1,2 and 5, in the above-described embodiment of the present application, alternatively, the cross-sectional shapes of the first groove 2023 and the third groove 1021 are W-shaped or U-shaped, and the cross-sectional shapes of the second groove 2024 and the fourth groove 2012 are regular hexagons, circles, trapezoids or diamonds.
In the present embodiment, by setting the cross-sectional shapes of the first groove 2023 and the third groove 1021 to be W-shaped or U-shaped, the contact area of the first groove 2023 and the third groove 1021 with the liquid 50 is made larger, thereby enhancing turbulence, throttling and vortex action, reducing leakage of the liquid 50, and improving the sealing effect. Of course, the cross-sectional shape of the first recess 2023 and the third recess 1021 may also be V-shaped or other types of shapes. The cross-sectional shapes of the second recess 2024 and the fourth recess 2012 may be regular hexagons, circles, trapezoids, or diamonds, so that the contact area between the second recess 2024 and the liquid 50 is larger, and throttling, turbulence, and vortex effects are enhanced, thereby reducing leakage of the liquid 50 and improving sealing effect. Of course, the cross-section of the first recess 2023 and the third recess 1021 may also be of other types of shapes.
As shown in fig. 5, in the above embodiment of the present application, optionally, a plurality of the second grooves 2024 are provided, and a plurality of the second grooves 2024 are provided at intervals along the circumferential direction of the sleeve 202.
In the present embodiment, a plurality of second grooves 2024 are provided, and a plurality of second grooves 2024 are provided at intervals along the circumferential direction of the sleeve 202. The number of the second grooves 2024 is multiple, so as to increase the contact area between the second grooves and the liquid 50, thereby enhancing turbulence, throttling and vortex effects, reducing leakage of the liquid 50, improving the sealing effect, and further expanding the application range of the spiral seal.
As shown in fig. 1 and 2, in an embodiment of the present application, optionally, the spiral seal structure 100 further includes a retainer ring 30, where the retainer ring 30 is located at an end of the rotating shaft 201 away from the first accommodating cavity 101 and abuts against an end surface of the housing 10.
In this embodiment, the retainer ring 30 is located at an end of the rotating shaft 201 away from the first accommodating cavity 101, and abuts against an end surface of the housing 10. Specifically, the retainer ring 30 is provided with a hole with an inner diameter slightly larger than the outer diameter of the rotating shaft 201 for the rotating shaft 201 to penetrate, the retainer ring 30 is abutted against the end face of the shell 10 and the end face of the shaft sleeve 202 for limiting the shaft sleeve 202, so that the shaft sleeve 202 is prevented from axially moving relative to the rotating shaft 201, the shaft sleeve 202 is firmly connected with the rotating shaft 201, the shaft sleeve 202 and the rotating shaft 201 can be in interference fit or firmly connected through a key, and the shaft sleeve 202 and the rotating shaft 201 synchronously rotate.
As shown in fig. 1 and 2, in the above embodiment of the present application, optionally, the spiral seal structure 100 further includes a fastener, and the retainer ring 30 and the housing 10 form a counterbore 301, and the fastener is inserted into the counterbore 301, so that the retainer ring 30 is fixedly connected with the housing 10.
In this embodiment, the retainer ring 30 and the housing 10 form a countersunk hole 301 for the fastener to pass through, so that the retainer ring 30 is fixedly connected with the housing 10. Wherein, the counter bore 301 is provided with two at least, and two counter bores 301 are arranged along the circumference interval of the retainer ring 30, and the fastener is worn to locate the counter bore 301 in proper order for the retainer ring 30 is connected with the casing 10 firmly. In particular, the fastener may be a screw to achieve the detachable connection.
As shown in fig. 1 and 2, in the above embodiment of the present application, optionally, the spiral seal structure 100 further includes a seal ring 40, and the seal ring 40 is sleeved on the rotating shaft 201 and is located between the shaft sleeve 202 and the retainer ring 30.
In this embodiment, the sealing ring 40 is sleeved on the rotating shaft 201, and is located between the shaft sleeve 202 and the retainer ring 30. Specifically, the end face of one end of the seal ring 40 abuts against the end face of the shaft sleeve 202 and the end face of the housing 10, and the end face of the other end abuts against the end face of the retainer ring 30, and when the rotation of the rotation shaft 201 is stopped, the screw dynamic seal/non-contact seal fails, and at this time, static seal/contact seal is realized by the seal ring 40, so that the liquid 50 does not leak.
In one embodiment of the present application, optionally, the cavity wall surface of the second receiving cavity 102 is coated with graphite.
In this embodiment, theoretically, the smaller the leakage gap between the screw tooth 2022 and the second accommodation chamber 102, the more advantageous the sealing effect. Because if the gap is large, the liquid 50 may only adhere to the walls of the second receiving chamber 102 and separate from the outer surface of the sleeve 202, the shaft assembly 20 does not act as a driving medium, disabling the seal. The gap is too small, which may cause the shaft assembly 20 and the second accommodating cavity 102 to rub and collide with each other, resulting in abrasion of components, so that a layer of graphite may be coated on the surface of the cavity wall of the second accommodating cavity 102 to protect the spiral sealing structure, thereby improving the service life of the spiral sealing structure 100.
In an embodiment of the present application, optionally, the spiral sealing structure further includes a driving device, and an output end of the driving device is connected to the rotating shaft 201 to drive the rotating shaft 201 to rotate.
In this embodiment, an end of the rotating shaft 201 away from the first accommodating cavity 101 is connected to an output end of a driving device, and the driving device rotates to drive the rotating shaft 201 to rotate synchronously. Specifically, the rotating shaft 201 is connected with the output end of the driving device through a coupling.
Embodiments of the present application also provide a compressor including the screw seal structure 100 of the above embodiments.
The compressor has the spiral sealing structure 100 in any of the above embodiments, so that the compressor has all the advantages of the spiral sealing structure 100, which are not described herein.
In summary, according to the spiral sealing structure provided by the application, the first groove and the second groove are respectively arranged on the shaft sleeve to interfere the flowing of the liquid in the leaking direction, so that the flowing energy of the liquid is consumed, and the rotation of the spiral groove and the spiral tooth on the shaft sleeve is matched to prevent the liquid in the first accommodating cavity from leaking to the outside through the second accommodating cavity and the through hole. The first groove increases the contact area between the liquid and the circumferential surface of the shaft sleeve, plays roles of turbulence, throttling and vortex, the second groove increases the contact area between the liquid and the end surface of the shaft sleeve, reduces the pressure intensity of the end surface of the shaft sleeve, improves the bearing pressure of the shaft sleeve, plays roles of turbulence, throttling and vortex, and consumes the flow energy of the liquid. Through setting up first recess and second recess, consumed the first flow energy that holds intracavity liquid and to the external world and reveal through second holds chamber and through-hole, reduced the liquid and revealed, improved the sealed effect of screw seal for screw seal also can use under the equal moderate occasion of differential pressure, liquid viscosity and rotational speed, and have good sealed effect, enlarged the application range of screw seal, avoided the screw seal among the prior art only to be applicable to the occasion that liquid viscosity is great, differential pressure is less and moderate rotational speed, lead to its application range less technical problem.
Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (8)
1. A spiral seal, comprising:
The device comprises a shell, wherein a first accommodating cavity and a second accommodating cavity which are communicated are formed in the shell, the first accommodating cavity is used for accommodating liquid, and a through hole communicated with the second accommodating cavity is formed in the shell;
the shaft assembly comprises a rotating shaft and a shaft sleeve, the rotating shaft sequentially penetrates through the through hole and the second accommodating cavity, at least part of the rotating shaft is located in the first accommodating cavity, the shaft sleeve is fixedly sleeved on the rotating shaft and located in the second accommodating cavity, a plurality of spiral teeth are arranged in the shaft sleeve at intervals along the axial direction of the shaft sleeve, spiral grooves are formed between two adjacent spiral teeth, a first groove is formed in the spiral teeth along the circumferential direction of the spiral teeth, and a second groove is formed in the end face, close to the first accommodating cavity, of the shaft sleeve;
a third groove is formed in the cavity wall of the second accommodating cavity, and the third groove is arranged corresponding to the first groove;
One end of the rotating shaft is provided with a shaft shoulder, the end face of the shaft shoulder is abutted against the end face of the shaft sleeve, the shaft shoulder is provided with a plurality of fourth grooves, and the fourth grooves are arranged at intervals along the circumferential direction of the shaft shoulder;
the surface of the cavity wall of the second accommodating cavity is coated with graphite;
The second grooves are arranged in a plurality, and the second grooves are arranged at intervals along the circumferential direction of the shaft sleeve;
And the output end of the driving device is connected with the rotating shaft so as to drive the rotating shaft to rotate.
2. The spiral seal of claim 1, wherein the helix of the spiral groove is at an angle of 30-60 degrees to the axis of the shaft.
3. The screw seal according to claim 1, wherein the screw tooth has an outer diameter smaller than an inner diameter of the second receiving chamber, and an end surface of the boss is flush with an end surface of the housing.
4. The spiral seal of claim 1, wherein the first and third grooves have a W-shaped or U-shaped cross-sectional shape, and the second and fourth grooves have a regular hexagon, a circle, a trapezoid, or a diamond-shaped cross-sectional shape.
5. The screw seal structure of claim 1, further comprising a retainer ring located at an end of the shaft remote from the first receiving cavity and abutting against an end face of the housing.
6. The screw seal of claim 5, further comprising a fastener, wherein the retainer ring and the housing form a counterbore, wherein the fastener is disposed through the counterbore to fixedly connect the retainer ring and the housing.
7. The screw seal structure of claim 6, further comprising a seal ring sleeved on the rotating shaft and positioned between the sleeve and the retainer ring.
8. A compressor comprising a spiral sealing structure according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210121458.7A CN114439943B (en) | 2022-02-09 | 2022-02-09 | Spiral seal structure and compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210121458.7A CN114439943B (en) | 2022-02-09 | 2022-02-09 | Spiral seal structure and compressor |
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| CN114439943A CN114439943A (en) | 2022-05-06 |
| CN114439943B true CN114439943B (en) | 2024-05-14 |
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| Publication number | Publication date |
|---|---|
| CN114439943A (en) | 2022-05-06 |
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