A sealing structure, compressor and control method

Abstract

The application provides a sealing structure, a compressor and a control method. The sealing structure comprises: a rotating shaft, wherein an impeller component is arranged on the rotating shaft; a shaft sleeve, wherein the shaft sleeve is sleeved on the rotating shaft, and the rotating shaft is rotatably arranged relative to the shaft sleeve; a sealing seat, wherein the sealing seat is sleeved on the shaft sleeve, a flow passage is arranged on the sealing seat, a cooling passage is arranged between the sealing seat and the impeller component, the cooling passage is communicated with the flow passage, and the cooling passage is communicated to the outside of the impeller component; and a sealing component, wherein the sealing component is in abutment with the sealing seat, and the sealing component and the shaft sleeve have a sealing passage communicated with the flow passage; and the sealing component expands when encountering water. The sealing structure solves the technical problems of difficult sealing of the compressor and short service life of the sealing in the related art.

Description

Technical Field

[0001] This invention relates to the field of sealing structure technology, specifically to a sealing structure, a compressor, and a control method. Background Technology

[0002] In existing technologies, there is a need for economical, safe, and environmentally friendly refrigerants. Water has advantages in terms of environmental protection and safety, making it an extremely superior refrigerant. Although water has advantages as a refrigerant, its physical properties, such as low molecular weight, high adiabatic index, and large specific volume, also determine that water vapor compression systems have characteristics such as high pressure ratio, small refrigeration capacity per unit volume, and high exhaust temperature.

[0003] When centrifugal steam compressors are used in conjunction with other equipment in refrigeration and heat pump cycles, they can effectively increase the pressure ratio of steam, reduce the exhaust temperature of steam, improve system efficiency, and reduce energy consumption.

[0004] However, due to the fluidity of water, the use of water for compressor cooling in existing technologies makes compressor sealing difficult. Therefore, existing technologies require further development. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a sealing structure, compressor and control method to solve the technical problem of difficult sealing of compressors in related technologies.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: a sealing structure is provided, comprising: a rotating shaft, on which an impeller component is disposed; a bushing, which is sleeved on the rotating shaft, and the rotating shaft and the bushing are rotatably disposed relative to each other; a sealing seat, which is sleeved on the bushing, and the sealing seat is provided with a flow channel, and a cooling channel is provided between the sealing seat and the impeller component, the cooling channel communicating with the flow channel and extending to the outside of the impeller component; and a sealing component, which abuts against the sealing seat, and a sealing channel communicating with the flow channel is provided between the sealing component and the bushing; wherein the sealing component expands upon contact with water.

[0007] Furthermore, the sealing seat includes a first sealing seat and a second sealing seat connected to each other, a flow channel is located between the first sealing seat and the second sealing seat, a cooling channel is located between the first sealing seat and the impeller component, and the second sealing seat is provided with a mounting groove for installing the sealing component.

[0008] Furthermore, the first sealing seat includes: a first body, which is sleeved on the bushing; and a second body, which is connected to the side of the first body away from the bushing. Along the rotation axis parallel to the rotation shaft, the thickness of the first body is greater than the thickness of the second body. The cooling channel includes a first cooling channel located between the first body and the impeller component and a second cooling channel located between the second body and the impeller component.

[0009] Furthermore, the first sealing seat is provided with a plurality of first sealing teeth, which are arranged at intervals and all abut against the bushing so that the fluid in the flow channel passes through the plurality of first sealing teeth to reach the cooling channel.

[0010] Furthermore, the second sealing seat is provided with a plurality of second sealing teeth, which are spaced apart and all abut against the bushing, so that the fluid in the flow channel passes through the plurality of second sealing teeth to reach the sealing channel.

[0011] Furthermore, the second sealing seat is provided with a chamfered portion, and a flow guide channel is formed between the chamfered portion and the bushing. The flow guide channel is located between multiple second sealing teeth and the sealing channel. One end of the multiple flow guide channels is connected to the sealing channel, and the other end of the multiple flow guide channels is connected to the flow channel. Along the direction of the flow channel closer to the sealing channel, the minimum distance between the chamfered portion and the bushing gradually increases. The angle between the surface of the chamfered portion and the axis of the rotating shaft ranges from 15° to 20°.

[0012] Furthermore, the sealing structure also includes: a diffuser plate, which has mounting holes and a liquid inlet channel connected to the mounting holes, and the flow channel is connected to the liquid inlet channel.

[0013] Furthermore, the inlet channel and the flow channel are arranged parallel to each other, and there is a connecting channel between the diffuser plate and the sealing component. The connecting channel is connected to both the inlet channel and the flow channel, and the connecting channel is perpendicular to the inlet channel.

[0014] Furthermore, the mounting holes include: a first mounting hole, in which the impeller component is disposed; a second mounting hole, which is connected to the first mounting hole, in which a first sealing seat is disposed; and a third mounting hole, which is connected to the end of the second mounting hole away from the first mounting hole, in which a second sealing seat is disposed; wherein the first mounting hole, the second mounting hole, and the third mounting hole are all circular structures, the inner diameter of the first mounting hole is smaller than the inner diameter of the second mounting hole, and the inner diameter of the second mounting hole is smaller than the inner diameter of the third mounting hole.

[0015] Furthermore, the diffuser plate is provided with an inlet, which is connected to the liquid inlet channel to allow fluid to be introduced into the liquid inlet channel. A regulating valve is connected to the inlet to regulate the flow rate of the fluid entering the liquid inlet channel.

[0016] Furthermore, there are multiple inlets, which are arranged around the diffuser plate; and / or, the sealing structure also includes a metering module for measuring the volume of fluid flowing out of the cooling channel.

[0017] Furthermore, the bushing includes an insertion portion and a flange portion, the sealing component is sleeved on the insertion portion, the flange portion protrudes from the outer surface of the insertion portion, and the flange portion is located on the side of the sealing component away from the flow channel.

[0018] A compressor is provided, including a sealing structure.

[0019] A control method is provided, comprising: introducing fluid into a flow channel; driving a rotating shaft to rotate and ejecting the fluid from a cooling channel; measuring the volume V of the fluid flowing out of the cooling channel; comparing V with a threshold S; if V≥S, stopping the introduction of fluid into the flow channel; if V<S, continuing to introduce fluid into the flow channel.

[0020] Beneficial effects:

[0021] 1. The sealing structure of the present invention is a water seal that also serves as a cooling seal.

[0022] 2. The sealing structure of the present invention uses graphite seal to prevent cooling water from entering the motor. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the sealing structure used in an embodiment of the present invention;

[0024] Figure 2 yes Figure 1 A magnified view of part I;

[0025] Figure 3 yes Figure 2 A magnified view of a section II;

[0026] Figure 4 This is a schematic diagram of the diffuser with a sealed structure used in an embodiment of the present invention.

[0027] The above figures include the following reference numerals:

[0028] 1. Rotating shaft; 2. Impeller assembly; 21. Cooling channel; 211. First cooling channel; 212. Second cooling channel; 3. Bushing; 31. Insertion part; 32. Flange part; 4. Sealing seat; 41. Flow channel; 401. First sealing seat; 402. Second sealing seat; 42. First body; 43. Second body; 44. First sealing tooth; 45. Second sealing tooth; 46. Chamfered part; 47. Guide channel; 5. Sealing component; 51. Sealing channel; 6. Diffuser plate; 61. Mounting hole; 611. First mounting hole; 612. Second mounting hole; 613. Third mounting hole; 62. Liquid inlet channel; 63. Inlet; 64. Connecting channel; 7. Regulating valve. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] According to an embodiment of the present invention, a sealing structure is provided; please refer to [link / reference]. Figures 1 to 4 The device includes: a rotating shaft 1, on which an impeller component 2 is mounted; a bushing 3, which is fitted onto the rotating shaft 1, and the rotating shaft 1 and bushing 3 are rotatably mounted relative to each other; a sealing seat 4, which is fitted onto the bushing 3, and has a flow channel 41 on the sealing seat 4, and has a cooling channel 21 between the sealing seat 4 and the impeller component 2, which communicates with the flow channel 41 and extends to the outside of the impeller component 2; and a sealing component 5, which abuts against the sealing seat 4, and has a sealing channel 51 between the sealing component 5 and the bushing 3 that communicates with the flow channel 41; wherein the sealing component 5 expands when exposed to water.

[0031] Using the above-mentioned device, cooling water enters the sealing structure through the flow channel 41 provided on the sealing seat 4. Since the pressure at the water inlet is greater than the pressure on both sides, the cooling water on the impeller component 2 side is squeezed into the cooling channel 21. During the rotation of the impeller component 2, it mixes with the airflow at the outlet of the impeller component 2, increasing the molecular mass of the fluid and playing a role in cooling and reducing noise of the outlet airflow. The cooling water on the sealing component 5 side is squeezed into the sealing component 5. When the impeller component 2 rotates at high speed and does work, the temperature and pressure of the airflow continuously increase, and the heat gradually diffuses towards the motor. The diffused heat is mainly absorbed by the sealing component, causing the temperature of the sealing component to rise continuously. If the sealing component is subjected to excessively high temperature, it will soften or even fall off, resulting in a weakening of the sealing effect. Under the squeezing action of water, the intermolecular distance inside the sealing component 5 will shrink, filling the tiny gaps on the sealing contact surface and improving the sealing performance. By using the combination of water seal and sealing component 5, the cooling water not only plays a role in cooling the sealing component, but also fills the gaps between the sealing components, playing a role in liquid sealing, which solves the technical problems of difficult compressor sealing and short seal service life in related technologies.

[0032] Specifically, in some embodiments, the impeller component 2 is an open impeller.

[0033] Specifically, in some embodiments, the sealing component 5 is made of graphite, which has good elasticity. Graphite has good self-lubricating properties. When the rotating shaft 1 rotates and drives the bushing 3 to rotate, the sealing component 5 and the bushing 3 come into frictional contact, and a lubricating film is gradually formed on the friction contact surface. This not only reduces frictional energy loss, but also fills gaps, reduces leakage, and improves the sealing effect, thereby preventing cooling water from flowing into the motor and ensuring the dryness of the motor cavity.

[0034] In the sealing structure of this embodiment, see Figure 1 The sealing seat 4 includes a first sealing seat 401 and a second sealing seat 402 connected to each other. A flow channel 41 is located between the first sealing seat 401 and the second sealing seat 402. A cooling channel 21 is located between the first sealing seat 401 and the impeller component 2. The second sealing seat 402 is provided with a mounting groove for installing the sealing component 5. In this way, cooling water flows through the flow channel 41 to cool the first sealing seat 401 and the second sealing seat 402 on both sides of the flow channel 41. Since the pressure at the water inlet is greater than the pressure on both sides, the cooling water flows to both sides after passing through the flow channel 41. The cooling water flowing to the cooling channel 21 cools the impeller component 2 and the first sealing seat 401 on both sides of the cooling channel 21, and also achieves a liquid seal effect.

[0035] In the sealing structure of this embodiment, see Figures 1 to 2The first sealing seat 401 includes: a first body 42, which is sleeved on the bushing 3; and a second body 43, which is connected to the side of the first body 42 away from the bushing 3. Along a direction parallel to the rotation axis of the rotating shaft 1, the thickness of the first body 42 is greater than the thickness of the second body 43. The cooling channel 21 includes a first cooling channel 211 located between the first body 42 and the impeller component 2, and a second cooling channel 212 located between the second body 43 and the impeller component 2. This increases the length of the cooling channel 21 and improves the cooling effect.

[0036] In the sealing structure of this embodiment, see Figures 1 to 2 The first sealing seat 401 is provided with a plurality of first sealing teeth 44, which are arranged at intervals and all abut against the bushing 3 so that the fluid in the flow channel 41 passes through the plurality of first sealing teeth 44 to reach the cooling channel 21.

[0037] In the sealing structure of this embodiment, see Figures 1 to 2 The second sealing seat 402 is provided with a plurality of second sealing teeth 45, which are spaced apart and abut against the bushing 3, so that the fluid in the flow channel 41 can reach the sealing channel 51 through the plurality of second sealing teeth 45. In this way, after the cooling water flows through the flow channel 41, it flows to both sides under pressure, passes through the first sealing tooth 44 to reach the cooling channel 21, and passes through the second sealing teeth 45 to reach the sealing channel 51. When passing through the first sealing tooth 44 and the second sealing tooth 45, the cooling water can play a role in cooling and liquid sealing.

[0038] In the sealing structure of this embodiment, see Figures 1 to 3 The second sealing seat 402 is provided with a chamfered portion 46, which forms a guide channel 47 between the chamfered portion 46 and the bushing 3. The guide channel 47 is located between multiple second sealing teeth 45 and the sealing channel 51. One end of the multiple guide channels 47 is connected to the sealing channel 51, and the other end of the multiple guide channels 47 is connected to the flow channel 41. Along the direction of the flow channel 41 towards the sealing channel 51, the minimum distance between the chamfered portion 46 and the bushing 3 gradually increases. The angle between the surface of the chamfered portion 46 and the axis of the rotating shaft 1 ranges from 15° to 20°. In this way, after the cooling water flows through the second sealing teeth 45, it is squeezed into the sealing component 5 by the 15° to 20° inclined surface. The 15° to 20° inclined surface can ensure that most of the cooling water is squeezed into the sealing component 5.

[0039] In the sealing structure of this embodiment, see Figures 1 to 3The sealing structure also includes a diffuser plate 6, on which mounting holes 61 and a liquid inlet channel 62 connected to the mounting holes 61 are provided, and a flow channel 41 is connected to the liquid inlet channel 62. In this way, cooling water flows from the liquid inlet channel 62 through the flow channel 41 and then flows to both sides to be discharged.

[0040] In the sealing structure of this embodiment, see Figures 1 to 2 The inlet channel 62 and the flow channel 41 are arranged parallel to each other. There is a connecting channel 64 between the diffuser plate 6 and the sealing component 5. The connecting channel 64 is connected to both the inlet channel 62 and the flow channel 41, and the connecting channel 64 is perpendicular to the inlet channel 62. In this way, the connecting channel 64 plays a buffering role for the flow of cooling water.

[0041] In the sealing structure of this embodiment, see Figure 3 The mounting hole 61 includes: a first mounting hole 611, in which the impeller component 2 is disposed; a second mounting hole 612, which is connected to the first mounting hole 611, and a first sealing seat 401 is disposed in the second mounting hole 612; and a third mounting hole 613, which is connected to the end of the second mounting hole 612 away from the first mounting hole 611, and a second sealing seat 402 is disposed in the third mounting hole 613. The first mounting hole 611, the second mounting hole 612, and the third mounting hole 613 are all circular structures. The inner diameter of the first mounting hole 611 is smaller than the inner diameter of the second mounting hole 612, and the inner diameter of the second mounting hole 612 is smaller than the inner diameter of the third mounting hole 613.

[0042] In the sealing structure of this embodiment, see Figure 1 The diffuser plate 6 is provided with an inlet 63, which is connected to the liquid inlet channel 62 so that fluid can be introduced into the liquid inlet channel 62 through the inlet 63. A regulating valve 7 is connected to the inlet 63 to regulate the flow rate of the fluid entering the liquid inlet channel 62.

[0043] In the sealing structure of this embodiment, see Figure 1 Multiple inlets 63 are arranged around the diffuser plate 6; and / or, the sealing structure also includes a metering module for measuring the volume of fluid flowing out of the cooling channel 21. Thus, providing multiple inlets 63 can effectively improve the efficiency of cooling water entering the inlet channel 62.

[0044] In the sealing structure of this embodiment, see Figure 1The bushing 3 includes an insertion portion 31 and a flange portion 32. The sealing component 5 is sleeved on the insertion portion 31, and the flange portion 32 protrudes from the outer surface of the insertion portion 31. The flange portion 32 is located on the side of the sealing component 5 away from the flow channel 41. Specifically, the bushing 3 is a hollow, rotating part, generally made of stainless steel, which can effectively prevent the cooling water from corroding the spindle 5. At the same time, the flange portion 32 can also prevent the cooling water from suddenly spraying into the motor when the water pressure is unstable, thus playing a certain blocking role.

[0045] In the compressor of this embodiment, see Figures 1 to 4 It includes a sealing structure, which is the sealing structure described above.

[0046] In the control method of this embodiment, see Figures 1 to 4 Applicable to the above-mentioned sealing structure, the control method includes:

[0047] Fluid is introduced into the flow channel 41;

[0048] Drive the rotating shaft 1 to rotate, throwing the fluid out of the cooling channel 21;

[0049] Measure the volume V of the fluid flowing out of the cooling channel 21;

[0050] Compare V with the threshold S;

[0051] If V≥S, then stop the flow of fluid into the flow channel 41;

[0052] If V < S, then continue to flow fluid into the flow channel 41.

[0053] Specifically, as the flow rate of cooling water increases, the cooling water gradually flows out of the sealing structure. At this time, the regulating valve 7 can adjust the water supply pressure according to the leakage volume and the temperature of the sealing structure, thereby ensuring that the cooling water flows out slowly in the form of droplets and eventually flows away from the bottom of the sealing structure. A flow meter is installed at the bottom of the sealing structure to detect the leakage volume in real time. At the same time, the flow meter transmits a signal to the regulating valve 7. When the temperature of the first sealing tooth 44 and the second sealing tooth 45 is higher than the set value, the regulating valve 7 increases the water supply pressure, increases the water supply, and decreases the temperature of the first sealing tooth 44 and the second sealing tooth 45. When the leakage volume measurement value V is higher than the threshold S, the regulating valve 7 needs to reduce the water supply pressure, thereby reducing the water supply and reducing the leakage volume.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0056] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0057] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0058] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A sealing structure, characterized in that, include: Rotating shaft (1), on which an impeller component (2) is provided; A bushing (3) is sleeved on the rotating shaft (1), and the rotating shaft (1) and the bushing (3) are rotatably arranged relative to each other; A sealing seat (4) is fitted onto the bushing (3). A flow channel (41) is provided on the sealing seat (4). A cooling channel (21) is provided between the sealing seat (4) and the impeller component (2). The cooling channel (21) is connected to the flow channel (41). The cooling channel (21) is connected to the outside of the impeller component (2). A sealing component (5) abuts against the sealing seat (4), and the sealing component (5) and the bushing (3) have a sealing channel (51) communicating with the flow channel (41); wherein the sealing component (5) expands when exposed to water; The sealing seat (4) includes a first sealing seat (401) and a second sealing seat (402) connected to each other, and the flow channel (41) is located between the first sealing seat (401) and the second sealing seat (402); The second sealing seat (402) is provided with a plurality of second sealing teeth (45), which are spaced apart and abut against the bushing (3) so that the fluid in the flow channel (41) passes through the plurality of second sealing teeth (45) to reach the sealing channel (51). The second sealing seat (402) is provided with a chamfered portion (46), which forms a guide channel (47) between the chamfered portion (46) and the bushing (3). The guide channel (47) is located between the plurality of second sealing teeth (45) and the sealing channel (51). One end of the plurality of guide channels (47) is connected to the sealing channel (51), and the other end of the plurality of guide channels (47) is connected to the flow channel (41). Along the direction of the flow channel (41) approaching the sealing channel (51), the minimum distance between the chamfered portion (46) and the bushing (3) gradually increases.

2. The sealing structure according to claim 1, characterized in that, The cooling channel (21) is located between the first sealing seat (401) and the impeller component (2), and the second sealing seat (402) is provided with a mounting groove for installing the sealing component (5).

3. The sealing structure according to claim 2, characterized in that, The first sealing seat (401) includes: The first body (42) is sleeved on the bushing (3). The second body (43) is connected to the side of the first body (42) away from the bushing (3). Along the rotation axis parallel to the rotation shaft (1), the thickness of the first body (42) is greater than the thickness of the second body (43). The cooling channel (21) includes a first cooling channel (211) located between the first body (42) and the impeller component (2) and a second cooling channel (212) located between the second body (43) and the impeller component (2).

4. The sealing structure according to claim 2, characterized in that, The first sealing seat (401) is provided with a plurality of first sealing teeth (44), which are arranged at intervals. The plurality of first sealing teeth (44) abut against the bushing (3) so that the fluid in the flow channel (41) passes through the plurality of first sealing teeth (44) to reach the cooling channel (21).

5. The sealing structure according to claim 2, characterized in that, The angle between the surface of the chamfered portion (46) and the axis of the rotating shaft (1) ranges from 15° to 20°.

6. The sealing structure according to claim 2, characterized in that, The sealing structure further includes: A diffuser plate (6) is provided with a mounting hole (61) and an inlet channel (62) connected to the mounting hole (61). The flow channel (41) is connected to the inlet channel (62).

7. The sealing structure according to claim 6, characterized in that, The liquid inlet channel (62) and the flow channel (41) are arranged parallel to each other. The diffuser plate (6) and the sealing seat (4) have a connecting channel (64). The connecting channel (64) is connected to both the liquid inlet channel (62) and the flow channel (41). The connecting channel (64) is perpendicular to the liquid inlet channel (62).

8. The sealing structure according to claim 7, characterized in that, The mounting hole (61) includes: The first mounting hole (611) is provided in which the impeller component (2) is disposed; The second mounting hole (612) is connected to the first mounting hole (611), and the first sealing seat (401) is disposed in the second mounting hole (612); The third mounting hole (613) is connected to the end of the second mounting hole (612) away from the first mounting hole (611), and the second sealing seat (402) is disposed in the third mounting hole (613); The first mounting hole (611), the second mounting hole (612), and the third mounting hole (613) are all circular structures. The inner diameter of the first mounting hole (611) is larger than the inner diameter of the second mounting hole (612), and the inner diameter of the second mounting hole (612) is larger than the inner diameter of the third mounting hole (613).

9. The sealing structure according to claim 6, characterized in that, The diffuser plate (6) is provided with an inlet (63), which is connected to the liquid inlet channel (62) so that fluid is introduced into the liquid inlet channel (62) through the inlet (63). A regulating valve (7) is connected to the inlet (63) to regulate the flow rate of the fluid entering the liquid inlet channel (62).

10. The sealing structure according to claim 9, characterized in that, There are multiple inlets (63), and the multiple inlets (63) are arranged around the diffuser plate (6); and / or, the sealing structure also includes a metering module for measuring the volume of fluid flowing out from the cooling channel (21).

11. The sealing structure according to claim 1, characterized in that, The bushing (3) includes an insertion part (31) and a flange part (32). The sealing member (5) is sleeved on the insertion part (31). The flange part (32) protrudes from the outer surface of the insertion part (31) and is located on the side of the sealing member (5) away from the flow channel (41).

12. A compressor, comprising a sealing structure, characterized in that, The sealing structure is the sealing structure according to any one of claims 1 to 11.

13. A control method applicable to the sealing structure according to any one of claims 1 to 11, characterized in that, The control method includes: Fluid is introduced into the flow channel (41); Drive the rotating shaft (1) to rotate, and throw the fluid out of the cooling channel (21); Measure the volume V of the fluid flowing out of the cooling channel (21); Compare V with the threshold S; If V≥S, then stop the flow of fluid into the flow channel (41); If V < S, then continue to flow fluid into the flow channel (41).

Images