Sealing assembly, heat pump system and heating system

Abstract

The utility model discloses a sealing assembly, a heat pump system and a heating system.The sealing assembly comprises a shell, an impeller, an impeller cover and a lining, an impeller cavity is formed in the shell, blades are formed on the impeller, the impeller is rotatably arranged in the impeller cavity, and the impeller cover is arranged on the periphery of the impeller in a surrounding mode and connected with the blades; a first sealing surface is formed on the outer peripheral surface of the wheel cover, the lining is arranged on the periphery of the wheel cover in a sleeving mode and contained in the impeller cavity, and a second sealing surface right opposite to the first sealing surface is formed on the inner peripheral surface of the lining; annular sealing teeth are formed on one of the first sealing face and the second sealing face, the multiple annular sealing teeth are arranged at intervals in the axial direction, a supporting boss is arranged between at least two adjacent annular sealing teeth, and the sealing strength of the annular sealing teeth can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of impeller sealing, and particularly relates to a sealing assembly, a heat pump system and a heating system. BACKGROUND

[0002] In the related art, the labyrinth seal is provided between the rotating part and the stationary part, and a series of throttling gaps are formed by the fluid flowing through a plurality of annular sealing teeth, so that the labyrinth seal structure is simple, has a long service life, does not need to be lubricated, and is convenient to maintain. The labyrinth seal structure is commonly used at the heat pump closed impeller cover and the bushing. However, in the case that the blade speed is high, the annular sealing teeth of the labyrinth seal structure are prone to plastic deformation. In the long-term operation process of the machine, the sealing effect is affected or even shell rubbing is caused due to the deformation of the annular sealing teeth. Therefore, how to improve the sealing effect of the annular sealing teeth has become a technical problem to be solved by the present application. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a sealing assembly which can improve the sealing effect of the annular sealing teeth.

[0004] According to the sealing assembly of the present application, the sealing assembly comprises a shell, an impeller, a cover and a bushing. The shell is internally formed with an impeller cavity. The impeller is formed with blades and is arranged in the impeller cavity. The cover is arranged around the outer periphery of the impeller and is connected with the blades. The outer peripheral surface of the cover is formed with a first sealing surface. The bushing is sleeved on the outer periphery of the cover and is accommodated in the impeller cavity. The inner peripheral surface of the bushing is formed with a second sealing surface which is opposite to the first sealing surface. One of the first sealing surface and the second sealing surface is formed with annular sealing teeth. The annular sealing teeth are configured in a plurality and are arranged in an axial direction. At least two adjacent annular sealing teeth are provided with a support boss.

[0005] According to the sealing assembly of the present application, when the fluid flows through the previous annular sealing teeth and then flows to the subsequent annular sealing teeth in the direction away from the impeller inlet, the support boss can also play a blocking role. Because the kinetic energy of the fluid is consumed in the process of continuously overcoming the resistance brought by the support boss, the flow rate of the fluid is continuously reduced under the action of the subsequent annular sealing teeth and the subsequent support boss. The fluid is limited in the area of the annular sealing teeth, thereby avoiding the external leakage of the fluid and enhancing the sealing effect of the sealing assembly.

[0006] According to the sealing assembly of some embodiments of the present application, a plurality of support bosses are arranged between the two adjacent annular sealing teeth and are arranged in a circumferential direction.

[0007] According to the sealing assembly of some embodiments of the present application, the support boss is connected between the tooth roots of the two annular sealing teeth.

[0008] According to the sealing assembly of some embodiments of the present application, the inner circumferential surface of the bushing is configured to gradually increase in diameter in a direction away from the impeller inlet, and the annular sealing teeth are arranged on the inner circumferential surface of the bushing and gradually increase in diameter in a direction away from the impeller inlet.

[0009] According to the sealing assembly of some embodiments of the present application, a plurality of stages are formed on the outer circumferential wall of the wheel cover, and each stage is arranged in radial alignment with a corresponding annular sealing tooth.

[0010] According to the sealing assembly of some embodiments of the present application, at least part of the outer circumferential wall of each stage is arranged in alignment with the tooth top of a corresponding annular sealing tooth, and the diameter of the stage gradually increases in a direction away from the impeller inlet.

[0011] According to the sealing assembly of some embodiments of the present application, at least two adjacent support bosses are arranged in a circumferential staggered manner.

[0012] According to the sealing assembly of some embodiments of the present application, the radial height of the support boss is h1, the tooth height of the annular sealing tooth is h2, and the following condition is satisfied: 0.1≤h1 / h2≤0.5.

[0013] A heat pump system according to embodiments of the present application is briefly described below.

[0014] The heat pump system according to embodiments of the present application includes the sealing assembly of any of the above embodiments. Since the heat pump system according to the present embodiment is provided with the sealing assembly of any of the above embodiments, the heat pump system according to the present application has a sealing assembly with higher structural strength, reducing the risk of failure of the annular sealing teeth due to plastic deformation. During long-term operation of the heat pump system, the risk of shell rubbing and other failures caused by deformation of the annular sealing teeth is avoided, reducing the possibility of system failure, enhancing the reliability of the entire heat pump system, reducing maintenance costs and downtime, and at the same time, enhancing the labyrinth seal effect, better preventing leakage of the working medium from the sealing part of the impeller cavity during high-speed operation of the blades. Good sealing performance helps to maintain the pressure environment inside the heat pump system, and the improvement of the sealing performance can reduce the pressure loss caused by leakage, thereby improving the compression efficiency of the working medium and further improving the heating or cooling efficiency of the entire heat pump system.

[0015] A heating system according to embodiments of the present application is briefly described below.

[0016] The heating system according to the embodiment of the present application comprises the heat pump system of the above-mentioned embodiments. Since the heating system according to the embodiment is provided with the heat pump system of any one of the above-mentioned embodiments, the heating system according to the present application has a heat pump system with higher sealing performance. The heating system usually needs to be operated for a long time in winter. After the heat pump system is adopted, the good sealing of the sealing assembly reduces the system failure caused by fluid leakage, avoids the overloading, overheating and even damage of the heat pump system due to the lack of fluid working medium, and also reduces the corrosion or blockage of other components caused by the leakage of fluid working medium, thereby reducing the maintenance frequency of the heating system, improving the reliability of the system, and ensuring the stable operation in the whole heating season. The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a structural schematic view of a sealing assembly according to the embodiment of the present application;

[0019] Figure 2 is a structural schematic view of a bushing of a sealing assembly according to the embodiment of the present application;

[0020] Figure 3 is Figure 1 is an enlarged structural schematic view of A in FIG.

[0021] REFERENCE SIGNS:

[0022] 100, sealing assembly;

[0023] 1, housing; 11, impeller cavity;

[0024] 2, impeller; 21, blade;

[0025] 3, wheel cover; 31, first sealing surface; 32, stage;

[0026] 4, bushing; 41, second sealing surface; 411, annular sealing tooth; 4111, tooth root; 4112, tooth top;

[0027] 412, support boss. DETAILED DESCRIPTION

[0028] Embodiments of the present application are described below in the accompanying drawings, in which like or similar designations denote like or similar elements or components throughout the various figures. The embodiments described below are exemplary and are not intended to be limiting of the present application, unless otherwise specified.

[0029] Reference is made below to Figures 1-3 A sealing assembly 100 according to an embodiment of the present application is described below.

[0030] The sealing assembly 100 according to an embodiment of the present application comprises a housing 1, an impeller 2, a cover 3 and a bush 4, the housing 1 has an impeller cavity 11 formed therein, the impeller 2 has blades 21 formed thereon and is rotatably arranged in the impeller cavity 11, the cover 3 is arranged around the outer periphery of the impeller 2 and is connected with the blades 21, the outer peripheral surface of the cover 3 has a first sealing surface 31 formed thereon, the bush 4 is sleeved on the outer periphery of the cover 3 and is accommodated in the impeller cavity 11, the inner peripheral surface of the bush 4 has a second sealing surface 41 formed thereon and facing the first sealing surface 31; one of the first sealing surface 31 and the second sealing surface 41 has annular sealing teeth 411 formed thereon, the annular sealing teeth 411 are configured in a plurality and are arranged in an axial direction with intervals, and at least two adjacent annular sealing teeth 411 are provided with a support boss 412.

[0031] According to the sealing assembly 100 of the embodiment of the present application, the first sealing surface 31 of the outer circumferential surface of the wheel cover 3 and the second sealing surface 41 of the inner circumferential surface of the bushing 4 are provided with annular sealing teeth 411, which are configured as a plurality of annular sealing teeth 411 and are arranged in an axial direction, the axial direction refers to the extension direction of the rotation center axis of the wheel cover 3 or the bushing 4, and the radial direction is perpendicular to the axial direction. When the blade 21 rotates at a high speed, the fluid flows through the plurality of annular sealing teeth 411, and there is a gap between the annular sealing teeth 411. When the fluid passes through the gap, a backflow effect is generated, thereby achieving the purpose of leakage blocking. Since the wheel cover 3 is rotating and the bushing 4 is relatively static, the fluid moves in a spiral trajectory in the gap between the first sealing surface 31 and the second sealing surface 41. When the fluid flows through the subsequent annular sealing teeth 411 away from the impeller inlet after passing through the previous annular sealing teeth 411, the support boss 412 also plays a blocking role. Since the support boss 412 occupies space, the fluid needs to bypass the support boss 412 to continue to advance, so that the flow path of the fluid becomes tortuous, increasing the flow resistance of the fluid. In the process of bypassing the support boss 412, the speed of the fluid gradually decreases. It can be understood that because the kinetic energy of the fluid is consumed in the process of overcoming the resistance brought by the support boss 412, the flow rate of the fluid is continuously reduced under the action of the subsequent annular sealing teeth 411 and the subsequent support boss 412. The fluid is limited in the area of the annular sealing teeth 411, avoiding the external leakage of the fluid, and enhancing the sealing effect of the sealing assembly 100.

[0032] It should be noted that the fluid also exerts a force on the annular sealing teeth 411. By providing a support boss 412 between at least two adjacent annular sealing teeth 411, the support boss 412 can provide additional support force for the annular sealing teeth 411. When the fluid exerts a radial pressure on the annular sealing teeth 411 to cause the annular sealing teeth 411 to bend and deform, the adjacent support boss 412 can limit the degree of bending of the annular sealing teeth 411, and disperse part of the force to the support boss 412, avoiding the annular sealing teeth 411 bearing excessive stress alone. The force borne by the annular sealing teeth 411 can be more evenly distributed in the entire structural system, so that the concentrated stress borne by a single annular sealing tooth 411 is significantly reduced, reducing the possibility of plastic deformation of the annular sealing teeth 411, thereby improving the structural strength of the annular sealing teeth 411, so that the annular sealing teeth 411 can still maintain good shape stability under the condition that the blade 21 rotates at a high speed, thereby ensuring the sealing effect of the labyrinth seal structure and avoiding problems such as sealing failure and shell scraping caused by deformation of the annular sealing teeth 411.

[0033] According to the sealing assembly 100 of some embodiments of the present application, a plurality of support bosses 412 are arranged between two adjacent annular sealing teeth 411, and the plurality of support bosses 412 are arranged in a circumferential direction.

[0034] During the flow of fluid from one annular sealing tooth 411 to another annular sealing tooth 411, the plurality of circumferentially spaced support bosses 412 increase the circumferential bypass path of the fluid, and the fluid bypasses the support bosses 412 at different positions to reach the next annular sealing tooth 411, which increases the complexity and resistance of the fluid flow, reduces the impact pressure of the fluid on the subsequent annular sealing tooth 411, reduces the risk of leakage of the annular sealing tooth 411, enhances the sealing effect, and further improves the reliability and stability of the sealing due to the reduction of the speed of the fluid.

[0035] Further, the circumferential arrangement of the plurality of support bosses 412 can provide more uniform support force to the annular sealing tooth 411 in the circumferential direction. When the blade 21 rotates at a high speed, the force of the fluid acting on the annular sealing tooth 411 is not completely uniformly distributed in the circumferential direction, and there may be local pressure concentration points. The circumferentially distributed support bosses 412 can disperse the uneven force and avoid deformation or damage of the annular sealing tooth 411 due to excessive local force, thereby enhancing the overall structural stability of the annular sealing tooth 411 and ensuring long-term stable operation of the labyrinth seal structure.

[0036] According to the sealing assembly 100 of some embodiments of the present application, the support boss 412 is connected between the tooth roots 4111 of two annular sealing teeth 411.

[0037] When the blade 21 is in operation, the fluid flowing through the sealing area exerts a force on the annular sealing tooth 411. Since the support boss 412 is connected between the tooth roots 4111 of two annular sealing teeth 411, when one annular sealing tooth 411 is impacted by the fluid and generates an outward thrust, the force can be effectively transmitted to the adjacent annular sealing tooth 411 through the support boss 412, so that the two annular sealing teeth 411 can cooperate to bear the external force and share the external force, thereby avoiding damage such as root fracture and deformation of a single annular sealing tooth 411 due to excessive force, and greatly enhancing the overall structural stability of the annular sealing tooth 411.

[0038] It should be noted that when the blade 21 is in operation, the force exerted on the annular sealing teeth 411 by the fluid flowing through the sealing area acts on the middle section or the tooth top 4112 of the annular sealing teeth 411, and the force on the middle section or the tooth top 4112 of the annular sealing teeth 411 generates a larger torque at the tooth root 4111, causing the tooth root 4111 of the annular sealing teeth 411 to be prone to deformation. The support boss 412 is connected to the tooth root 4111 and directly provides support to the tooth root 4111, which can limit the displacement and deformation of the tooth root 4111, ensure that the annular sealing teeth 411 can still maintain good shape and strength at the root position, maintain the integrity of the entire labyrinth seal structure, and ensure that it can stably play a sealing role for a long time.

[0039] According to some embodiments of the sealing assembly 100, the inner circumferential surface of the bushing 4 is configured to gradually increase in diameter in the direction away from the impeller inlet, and the annular sealing teeth 411 are arranged on the inner circumferential surface of the bushing 4 and gradually increase in diameter in the direction away from the impeller inlet.

[0040] It should be noted that in the related art, the diameter of the blade 21 gradually decreases in the direction of the impeller inlet, and the diameter of the corresponding cover 3 also gradually decreases in the direction of the impeller inlet to match the diameter of the blade 21, the inner circumferential surface of the bushing 4 is configured to gradually increase in diameter in the direction away from the impeller inlet, and the smaller inner diameter of the bushing 4 is adapted to the smaller diameter region of the blade 21 near the impeller inlet, so that the gap between the cover 3 and the bushing 4 is limited at the beginning, preventing fluid from leaking due to the excessive gap between the cover 3 and the bushing 4, and in the direction away from the impeller inlet, the diameter of the blade 21 gradually increases, and the diameter of the bushing 4 also increases accordingly; the annular sealing teeth 411 are arranged on the inner circumferential surface of the bushing 4 and gradually increase in diameter in the direction away from the impeller inlet, and the smaller diameter annular sealing teeth 411 are matched with the initial size of the cover 3 at the impeller inlet to block the fluid from leaking to the side, along the direction of fluid flow, as the diameter of the cover 3 and the bushing 4 gradually increases, the subsequent annular sealing teeth 411 gradually increasing in diameter are arranged in sequence, and each annular sealing tooth 411 plays a sealing role at the corresponding position of the cover 3. Due to the matching of the position and size of the annular sealing teeth 411 with the changes of the cover 3, the annular sealing teeth 411 can cooperate with the cover 3 at a matching interval and coverage, reducing the possible leakage channels of the fluid, thereby improving the overall sealing effect, ensuring that the sealing assembly 100 can work efficiently and stably during operation, and reducing energy loss and performance degradation caused by leakage and other problems.

[0041] According to the sealing assembly 100 of some embodiments of the present application, the outer peripheral wall of the wheel cover 3 is formed with a plurality of steps 32, each of which is arranged in radial opposition to a corresponding annular sealing tooth 411, and the diameter of the steps 32 gradually increases in the direction away from the impeller inlet.

[0042] The outer peripheral wall of the wheel cover 3 is formed with a plurality of steps 32, each of which is arranged in radial opposition to a corresponding annular sealing tooth 411, and it should be noted that the fluid is in the direction of escape away from the impeller inlet, in order to avoid the escape of the fluid, each step 32 and the corresponding annular sealing tooth 411 will block the fluid, when the fluid wants to break through the seal and leak in the direction away from the impeller inlet, it first needs to bypass the sealing structure composed of the steps 32 and the annular sealing teeth 411, since the steps 32 and the annular sealing teeth 411 are in radial opposition, part of the fluid between the annular sealing teeth 411 and between the annular sealing teeth 411, and another part of the fluid between the steps 32 and the annular sealing teeth 411, appears to be backflow, making the fluid flow path tortuous and having a greater obstruction, as the fluid flows in the direction away from the impeller inlet, the diameter of the steps 32 also gradually increases, each group of steps 32 and annular sealing teeth 411 further increases the difficulty of fluid leakage, thereby enhancing the sealing effect of the entire sealing assembly 100, effectively reducing the amount of fluid leakage, and ensuring the stability of the working environment inside the impeller cavity 11.

[0043] According to the sealing assembly 100 of some embodiments of the present application, at least part of the outer peripheral wall of each step 32 is arranged in radial opposition to the tooth top 4112 of the corresponding annular sealing tooth 411.

[0044] Further, at least part of the outer peripheral wall of each step 32 is arranged in radial opposition to the tooth top 4112 of the corresponding annular sealing tooth 411, when the fluid impacts the annular sealing tooth 411, part of the fluid will be blocked by the annular sealing tooth 411, and backflow will occur, and another part of the fluid will be transmitted along the outer peripheral wall of the step 32 to the next annular sealing tooth 411 area, and since the diameter of the step 32 increases in the direction away from the impeller inlet, the step 32 is raised in the direction away from the impeller inlet, so another part of the fluid will backflow at the variable cross-section of the upper step, and the amount of fluid transmitted to the next annular sealing tooth 411 area will be reduced, and under the cooperation of the outer peripheral wall of the step 32 and the annular sealing tooth 411, the fluid is limited in the area of each step 32 and the annular sealing tooth 411, achieving a sealing effect.

[0045] According to the sealing assembly 100 of some embodiments of the present application, at least two adjacent support bosses 412 are arranged in a circumferential staggered manner.

[0046] When the sealing assembly 100 is in operation, especially when the vane 21 is in high-speed rotation and the fluid flows in the impeller cavity 11 and acts on the annular sealing teeth 411, the annular sealing teeth 411 will bear the impact force of the fluid. When the two adjacent support bosses 412 are staggered in the circumferential direction, the annular sealing teeth 411 can achieve more uniform force distribution in the circumferential direction, avoiding excessive local stress due to uneven force distribution, thereby effectively reducing the risk of root fracture and deformation of the annular sealing teeth 411, enhancing the overall structural stability of the annular sealing teeth 411, and ensuring long-term reliable sealing effect under complex working conditions.

[0047] According to some embodiments of the sealing assembly 100 of the present application, the radial height of the support boss 412 is h1, the tooth height of the annular sealing tooth 411 is h2, and 0.1≤h1 / h2≤0.5 is satisfied.

[0048] If the value of h1 / h2 is too small, less than 0.1, the radial height of the support boss 412 is too low, and the support provided by the support boss 412 to the annular sealing tooth 411 will be very limited. When facing a larger external force, the annular sealing tooth 411 may be easily deformed, damaged, etc. due to insufficient support. Conversely, if the value of h1 / h2 is too large, exceeding 0.5, the support boss 412 is too high, which can change the flow path of the fluid, reduce the length of the annular sealing tooth 411, and reduce the contact area with the fluid, thereby weakening the sealing effect. At the same time, the too high support boss 412 can change the stress distribution of the entire sealing structure, causing the annular sealing tooth 411 to be locally stressed too concentrated at the connection part with the support boss 412, which is prone to deformation at the connection part of the support boss 412. Through 0.1≤h1 / h2≤0.5, the support boss 412 can share the external force of the annular sealing tooth 411, and through cooperative stress with the annular sealing tooth 411, the problems of root fracture and bending deformation of the annular sealing tooth 411 due to excessive stress can be effectively avoided, thereby ensuring that the annular sealing tooth 411 remains structurally complete under complex working conditions and maintains the stability of the labyrinth sealing structure.

[0049] In some embodiments of the present application, six support bosses 412 are arranged at intervals in the circumferential direction of the annular sealing tooth 411, achieving uniform support of each annular sealing tooth 411, and improving the structural strength of the annular sealing tooth 411.

[0050] The heat pump system according to the embodiments of the present application will be briefly described below.

[0051] The heat pump system according to the embodiment of the present application comprises the sealing assembly 100 of any of the above embodiments, and since the heat pump system according to the embodiment is provided with the sealing assembly 100 of any of the above embodiments, the heat pump system according to the present application has the sealing assembly 100 with better sealing effect. Since the heat pump system needs to be operated continuously for a long time and is inconvenient to be repeatedly disassembled and assembled, it is necessary to improve the sealing performance. Since the sealing assembly 100 has better sealing effect, the leakage of fluid when flowing through the impeller cavity 11 is significantly reduced. When the fluid leakage is reduced, it can be ensured that there is sufficient and stable fluid participating in the heat exchange process in each cycle of the heat pump system, thereby avoiding the reduction of cycle efficiency caused by leakage of working medium, improving the heating and refrigeration efficiency of the entire heat pump system, enabling the system to output more useful heat or refrigeration capacity under the condition of consuming the same energy, improving the energy utilization rate, meeting the energy saving requirement, and at the same time, the sealing assembly 100 has higher structural strength, reducing the risk of failure of the annular sealing teeth 411 due to plastic deformation, avoiding the shell rubbing failure caused by deformation of the annular sealing teeth 411 during long-term operation of the heat pump system, reducing the possibility of system failure, enhancing the reliability of the entire heat pump system, and reducing the maintenance cost and downtime.

[0052] The heating system according to the embodiment of the present application is briefly described below.

[0053] The heating system according to the embodiment of the present application comprises the heat pump system of the above embodiments, and since the heating system according to the embodiment is provided with the heat pump system of any of the above embodiments, the heating system according to the present application has the heat pump system with higher sealing performance. The heating system usually needs to be operated for a long time in winter, and after the heat pump system is adopted, the good sealing of the sealing assembly 100 reduces the system failure caused by fluid leakage, avoids the overload, overheating or even damage of the heat pump system due to insufficient fluid working medium, and also reduces the corrosion or blockage of other components caused by leakage of fluid working medium, thereby reducing the maintenance frequency of the heating system, improving the reliability of the system, and ensuring the stable operation in the entire heating season.

[0054] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0055] In the description of the application, "first feature", "second feature" can include one or more of the features.

[0056] In the description of the application, "a plurality of" means two or more.

[0057] In the description of the application, "on" or "under" the first feature in the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them.

[0058] In the description of the application, "on", "above" and "over" the first feature in the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0059] In the description of the application, the description of the reference terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the description of the application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the application, and the scope of the application is defined by the claims and their equivalents.

Claims

1. A seal assembly characterized by, include: The housing (1) has an impeller cavity (11) formed inside it. Impeller (2), blades (21) are formed on the impeller (2) and the impeller (2) is rotatably disposed in the impeller cavity (11); Wheel cover (3), the wheel cover (3) is disposed around the outer periphery of the impeller (2) and connected to the blade (21), and the outer periphery surface of the wheel cover (3) forms a first sealing surface (31); A bushing (4) is fitted around the outer periphery of the wheel cover (3) and housed within the impeller cavity (11). The inner circumferential surface of the bushing (4) forms a second sealing surface (41) directly opposite the first sealing surface (31). An annular sealing tooth (411) is formed on one of the first sealing surface (31) and the second sealing surface (41). The annular sealing tooth (411) is constructed in multiple ways and is spaced apart in the axial direction. A support boss (412) is provided between at least two adjacent annular sealing teeth (411).

2. The seal assembly of claim 1, wherein, A plurality of support bosses (412) are provided between two adjacent annular sealing teeth (411), and the plurality of support bosses (412) are arranged at intervals in the circumferential direction.

3. The seal assembly of claim 2, wherein, The support boss (412) is connected between the tooth roots (4111) of the two annular sealing teeth (411).

4. The seal assembly of claim 3 wherein, The inner circumferential surface of the bushing (4) is constructed such that its diameter gradually increases in the direction away from the impeller inlet direction, and the annular sealing tooth (411) is disposed on the inner circumferential surface of the bushing (4) and its diameter gradually increases in the direction away from the impeller inlet direction.

5. The seal assembly of claim 4, wherein, Multiple stepped sections (32) are formed on the outer peripheral wall of the wheel cover (3). Each stepped section (32) is radially opposite to the corresponding annular sealing tooth (411). The diameter of the stepped section (32) gradually increases in the direction away from the impeller inlet.

6. The seal assembly of claim 5, wherein, At least a portion of the outer peripheral wall of each stage (32) is positioned directly opposite the tooth tip (4112) of the corresponding annular sealing tooth (411).

7. The seal assembly of claim 2 wherein, At least two adjacent support bosses (412) are staggered in the circumferential direction.

8. The seal assembly of any of claims 1-7, wherein, The radial height of the support boss (412) is h1, and the tooth height of the annular sealing tooth (411) is h2, and satisfies: 0.1≤h1 / h2≤0.

5.

9. A heat pump system, characterized by, Includes the sealing assembly (100) as described in any one of claims 1-8.

10. A heating system, characterised in that, Including the heat pump system as described in claim 9.

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