Mechanical sealing structure for shaft end of compressor

Abstract

The utility model relates to a mechanical sealing structure for a shaft end of a compressor. The compressor is characterized in that the compressor comprises a movable ring, a static ring and a lip-shaped sealing ring, an oil storage cavity and an oil supply ring cavity are formed in a compressor shell, the oil storage cavity and a rotor cavity are separated through a separation convex ring, and the lip-shaped sealing ring is installed between the separation convex ring and a compressor rotor; the movable ring and the static ring are both located in the oil storage cavity, the movable ring is fixed to a compressor rotor, the static ring is fixed to a compressor shell, a sealing convex ring on the movable ring abuts against a sealing plane of the static ring to form a mechanical sealing face, an inlet of the oil supply ring cavity is connected with an external high-pressure oil supply pipe, and a plurality of oil spraying openings are formed in the wall face between the oil supply ring cavity and the oil storage cavity. And the oil injection port is obliquely arranged and is aligned with the mechanical sealing surface. The sealing device is reasonable in structural design and good in sealing, lubricating and cooling effects.

Description

Technical Field

[0001] The utility model relates to the technical field of compressors, in particular to a mechanical sealing structure for a compressor shaft end, which is mainly used in screw compressors. Background Art

[0002] The shaft end of a compressor typically requires sealing, lubrication, and cooling. The currently used hybrid oil injection and sealing design is not rational. With only one oil injection port, refrigerant oil is supplied from only one direction, resulting in poor oil injection and uneven cooling and lubrication of the shaft. Furthermore, when the compressor is first started, refrigerant oil cannot be immediately supplied to the seal. During the initial friction, the seal is not lubricated or cooled by the refrigerant oil, which can easily lead to seal burnout. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a mechanical seal structure for a compressor shaft end which has a reasonable structural design and good sealing, lubricating and cooling effects.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is as follows: the mechanical seal structure for the shaft end of the compressor is provided with a rotor cavity in the compressor housing, the compressor rotor is installed in the rotor cavity, the input end of the compressor rotor extends outside the compressor housing and is connected to the motor through a coupling, and its structural characteristics are as follows: the mechanical seal structure includes a dynamic ring provided with a sealing convex ring, a static ring provided with a sealing plane and a lip seal ring, an oil storage cavity and an oil supply ring cavity are also provided in the compressor housing, the upper half of the oil storage cavity is provided with an oil drain hole, the oil storage cavity and the rotor cavity are separated by a separating convex ring, the separating convex ring and the compressor housing are an integrated structure, a rotor gap exists between the separating convex ring and the compressor rotor, the lip seal ring is installed between the separating convex ring and the compressor rotor, and the lip edge of the lip seal ring is in close contact with the compressor rotor; The dynamic ring and the static ring are both located in the oil storage cavity, the dynamic ring is fixed to the compressor rotor, and the static ring is fixed to the compressor housing. The sealing convex ring on the dynamic ring is pressed against the sealing plane of the static ring to form a mechanical sealing surface for isolating the section of the compressor rotor from the input end of the compressor rotor to the position of the dynamic ring from the refrigerant oil in the oil storage cavity. The bottom of the oil storage cavity is lower than the bottom of the rotor gap, and the bottom of the mechanical sealing surface is lower than the bottom of the rotor gap. The inlet of the oil supply ring cavity is connected to the external high-pressure oil supply pipe, and the wall between the oil supply ring cavity and the oil storage cavity is provided with several oil spray ports. The oil supply ring cavity is connected to the oil storage cavity through the oil spray ports, and the oil spray ports are arranged obliquely. The outlet of the oil spray port is aligned with the mechanical sealing surface formed after the sealing convex ring on the dynamic ring and the sealing plane of the static ring contact, and is used to spray refrigerant oil with freezing and lubricating effects on the mechanical sealing surface.

[0005] Preferably, each fuel injection port of the present invention includes two sections with different diameters, the inlet of the fuel injection port is located at the section with the thicker diameter, and the outlet of the fuel injection port is located at the section with the thinner diameter.

[0006] Preferably, the plurality of oil injection ports of the present invention are evenly distributed around the mechanical sealing surface formed by the contact between the sealing convex ring on the dynamic ring and the sealing plane of the static ring, and the oil injection direction of each oil injection port is tangent to the mechanical sealing surface.

[0007] Preferably, the number of the fuel injection ports of the present invention is 4 to 20.

[0008] Preferably, the outlet of the oil injection port of the present invention is close to the mechanical sealing surface formed by the contact between the sealing convex ring on the dynamic ring and the sealing plane of the static ring.

[0009] A sealing, lubricating and cooling method using the mechanical sealing structure for a compressor shaft end is characterized by the following steps:

[0010] When the compressor is in a long-term shutdown state, the oil storage cavity below the rotor gap or below the oil drain hole stores refrigerant oil, and the lower part or most of the dynamic ring and the lower part or most of the static ring are always immersed in the refrigerant oil in the oil storage cavity;

[0011] When the compressor starts, since the lower parts of the moving ring and the lower parts of the static ring are always immersed in the refrigeration oil in the oil storage chamber, the moving ring is driven to rotate synchronously with the rotation of the compressor rotor, and the moving ring brings the refrigeration oil in the oil storage chamber to the entire mechanical sealing surface. The mechanical sealing surface in contact with the moving ring and the static ring can be cooled and lubricated by the refrigeration oil synchronously with the start of the compressor, ensuring that there is refrigeration oil when the moving ring starts to rub against the static ring. The mechanical sealing surface in contact with the moving ring and the static ring is lubricated and cooled from the moment the compressor starts, which effectively solves the problem of mechanical seals burning due to lack of cooling and lubrication of refrigeration oil when the compressor starts; at the same time, the refrigeration oil input from the outside for cooling and lubrication is supplied through the external high-pressure supply The oil is transported to the oil supply ring cavity through the oil pipe, and the refrigerant oil is sprayed through the oil spray port to the mechanical seal surface formed by the contact between the sealing convex ring on the dynamic ring and the sealing plane of the static ring, thereby continuously lubricating and cooling the mechanical seal surface in contact with the dynamic ring and the static ring; as the compressor rotor rotates at high speed, the lip seal ring is subjected to the pressure difference, and under the sealing action of the lip seal ring, the refrigerant oil sprayed from the oil spray port continuously accumulates in the oil storage cavity until the liquid level in the oil storage cavity is higher than the oil drain hole in the oil storage cavity, and the excess refrigerant oil is discharged from the oil storage cavity through the oil drain hole, so that the refrigerant oil in the oil storage cavity is continuously replaced, further reducing the temperature of the refrigerant oil in the oil storage cavity, and achieving better cooling and lubricating effects on the mechanical seal surface in contact with the dynamic ring and the static ring;

[0012] When the compressor is started and in normal operation, the refrigerant oil is continuously transported to the oil supply ring cavity through the external high-pressure oil supply pipe, and the refrigerant oil is continuously sprayed through the oil nozzle to the mechanical sealing surface formed by the contact between the sealing convex ring on the dynamic ring and the sealing plane of the static ring. It is used to continuously lubricate and cool the mechanical sealing surface in contact with the dynamic ring and the static ring. The excess refrigerant oil in the oil storage cavity is discharged through the oil drain hole. At the same time, the refrigerant oil is supplied to the bearing cavity of the compressor and the compressor rotor through the internal oil channel, and is discharged from the compressor with the gas. The refrigerant oil and the refrigerant are separated by the oil separator. After the circulation, the refrigerant oil returns to the oil supply ring cavity, and then enters the oil storage cavity again through the oil nozzle to realize the recycling of the refrigerant oil.

[0013] As a preferred embodiment, when the compressor is turned off, the compressor rotor loses driving force and gradually stops rotating. At the same time, the external high-pressure oil supply pipe stops supplying refrigeration oil to the oil supply ring cavity, and the oil spray port stops spraying refrigeration oil to the mechanical sealing surface formed by the contact between the sealing convex ring on the dynamic ring and the sealing plane of the static ring. The refrigeration oil stored in the oil storage cavity still lubricates and cools the mechanical sealing surface in contact with the dynamic ring and the static ring during the process of the compressor rotor gradually stopping rotating until the compressor rotor stops rotating.

[0014] As the compressor rotor stops rotating, the lip seal loses the pressure differential. If the lip seal is not sealed tightly, the refrigerant oil in the oil storage chamber will gradually flow into the rotor chamber of the compressor housing along the rotor gap, and the liquid level of the refrigerant oil in the oil storage chamber will gradually decrease until it is flush with the bottom of the rotor gap. Since the bottom of the oil storage chamber is lower than the bottom of the rotor gap, the refrigerant oil below the bottom of the rotor gap is still stored in the oil storage chamber. At this time, the lower part of the oil storage chamber is still stored with refrigerant oil, and the lower part of the dynamic ring and the lower part of the static ring are always immersed in the refrigerant oil in the oil storage chamber, waiting for the next start of the compressor. When the compressor is started next time, the refrigerant oil stored in the oil storage chamber can simultaneously lubricate and cool the mechanical seal surface formed by the contact between the sealing convex ring on the dynamic ring and the sealing plane of the static ring at the moment the compressor starts;

[0015] Alternatively, because the compressor rotor stops rotating, the lip seal loses the pressure differential. If the lip seal still has a stable sealing effect, the refrigerant oil in the oil storage chamber will not flow into the rotor chamber of the compressor housing along the rotor gap. Refrigerant oil is stored in the oil storage chamber below the oil drain hole. The parts of the dynamic ring and the static ring below the oil drain hole are always immersed in the refrigerant oil in the oil storage chamber, waiting for the next start of the compressor. When the compressor starts next time, the refrigerant oil stored in the oil storage chamber can synchronously lubricate and cool the mechanical sealing surface formed after the sealing convex ring on the dynamic ring and the sealing plane of the static ring contact at the moment the compressor starts.

[0016] Compared with the prior art, the present invention has the following advantages and effects: when the compressor is in a stopped state, since the lower part of the moving ring and the lower part of the static ring are always immersed in the refrigeration oil in the oil storage chamber, when the compressor is started, the moving ring is driven to rotate synchronously with the rotation of the compressor rotor, and the moving ring brings the refrigeration oil in the oil storage chamber to the entire mechanical seal surface. The mechanical seal surface in contact with the moving ring and the static ring can be cooled and lubricated by the refrigeration oil synchronously with the start of the compressor, ensuring that the refrigeration oil is present when the moving ring starts to rub against the static ring. From the moment the compressor starts, the mechanical seal surface in contact with the moving ring and the static ring is lubricated and cooled synchronously, effectively solving the problem of the mechanical seal being burned due to lack of cooling and lubrication of the refrigeration oil when the compressor starts. The currently commonly used mechanical seal structure cannot ensure that the mechanical seal has refrigeration oil when it starts to rub, resulting in the burning of the mechanical seal.

[0017] This new design enhances compressor operational stability. The multiple, angled oil nozzles improve injection efficiency and cooling, providing more uniform lubrication and cooling of the mechanical seal surfaces between the rotating and stationary rings, ensuring long-term compressor operational stability. The oil nozzles spray tangentially to the mechanical seal surface and in the direction of rotation of the compressor rotor, reducing the impact of liquid applied in conventional injection directions and extending the lifespan of the rotating and stationary rings.

[0018] The utility model can improve the operating range of the compressor. The cooling effect of the refrigeration oil on the dynamic ring and the static ring enables the dynamic ring and the static ring to maintain a normal working state at a high speed, thereby widening the operating range of the compressor.

[0019] The utility model improves the safety of the compressor. The design of the oil storage chamber can ensure that the dynamic ring and the static ring serving as the mechanical seal are always lubricated with refrigeration oil. Even when the compressor is stopped for a long time, the dynamic ring and the static ring can still be cooled and lubricated by the refrigeration oil, ensuring that the dynamic ring and the static ring serving as the mechanical seal have refrigeration oil when they just begin to rub at the moment of compressor startup, solving the problem of the mechanical seal burning due to lack of cooling and lubrication of refrigeration oil when the compressor is started, thereby greatly improving the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention and / or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments and / or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1It is a structural diagram of the motor, coupling and compressor in an embodiment of the present utility model after being connected.

[0022] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the AA surface in the middle.

[0023] Figure 3 yes Figure 1 Schematic diagram of the left view structure.

[0024] Figure 4 yes Figure 1 Schematic diagram of the structure after the middle part is cut away.

[0025] Figure 5 yes Figure 4 Schematic diagram of the structure after enlarging point Ⅰ in the middle.

[0026] Figure 6 yes Figure 2 Schematic diagram of the structure after enlargement at point II.

[0027] Figure 7 yes Figure 5 Schematic diagram of the structure after enlarging at point III.

[0028] In the figure: 1-motor; 2-coupling; 3-compressor; 4-injection port; 5-dynamic ring; 6-static ring; 7-oil storage chamber; 8-lip seal; 9-compressor rotor; 10-compressor housing; 11-oil supply ring chamber; 12-rotor gap; 13-separating convex ring; 51-sealing convex ring; 61-sealing plane. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0030] Example

[0031] See also Figures 1 to 7 The compressor 3 includes a compressor rotor 9 and a compressor housing 10. A rotor cavity is provided in the compressor housing 10. The compressor rotor 9 is installed in the rotor cavity. The input end of the compressor rotor 9 extends outside the compressor housing 10 and is connected to the motor 1 through the coupling 2. After the motor 1 is energized, the compressor rotor 9 is driven to rotate through the coupling 2.

[0032] The mechanical sealing structure for the compressor shaft end in this embodiment includes a dynamic ring 5 provided with a sealing convex ring 51, a static ring 6 provided with a sealing plane 61 and a lip sealing ring 8. An oil storage chamber 7 and an oil supply ring chamber 11 are also provided in the compressor housing 10. The upper half of the oil storage chamber 7 is provided with an oil drain hole. The oil storage chamber 7 and the rotor chamber are separated by a separating convex ring 13. The separating convex ring 13 and the compressor housing 10 are an integrated structure. There is a rotor gap 12 between the separating convex ring 13 and the compressor rotor 9. The lip sealing ring 8 is installed between the separating convex ring 13 and the compressor rotor 9, and the lip edge of the lip sealing ring 8 is in close contact with the compressor rotor 9.

[0033] In this embodiment, the dynamic ring 5 and the static ring 6 are both located in the oil storage chamber 7. The dynamic ring 5 is fixed to the compressor rotor 9, and the static ring 6 is fixed to the compressor housing 10. The sealing convex ring 51 on the dynamic ring 5 is pressed against the sealing plane 61 of the static ring 6 to form a mechanical sealing surface for isolating the section of the compressor rotor 9 from the input end of the compressor rotor 9 to the position of the dynamic ring 5 from the refrigerant oil in the oil storage chamber 7. The bottom of the oil storage chamber 7 is lower than the bottom of the rotor gap 12, and the bottom of the mechanical sealing surface is lower than the bottom of the rotor gap 12.

[0034] In this embodiment, the inlet of the oil supply ring cavity 11 is connected to a high-pressure oil supply pipe from the outside. Several oil injection ports 4 are provided on the wall between the oil supply ring cavity 11 and the oil storage cavity 7. The oil supply ring cavity 11 communicates with the oil storage cavity 7 through the oil injection ports 4. The number of oil injection ports 4 is typically 4 to 20. The oil injection ports 4 are arranged obliquely, with the outlet of the oil injection ports 4 aligned with the mechanical seal surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing surface 61 of the static ring 6, for spraying refrigeration oil with cooling and lubricating properties onto the mechanical seal surface.

[0035] In this embodiment, each fuel injection port 4 comprises two sections of different diameters. The inlet of the fuel injection port 4 is located in the thick section, and the outlet of the fuel injection port 4 is located in the thin section. The outlet of the fuel injection port 4 is close to the mechanical seal formed by the contact between the sealing protrusion 51 on the dynamic ring 5 and the sealing surface 61 of the static ring 6.

[0036] In this embodiment, the multiple oil injection ports 4 are evenly distributed around the mechanical sealing surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing plane 61 of the static ring 6, and the injection direction of each oil injection port 4 is tangent to the mechanical sealing surface, and the tangential direction is consistent with the rotation direction of the compressor rotor 9.

[0037] The steps of the sealing, lubricating and cooling method for the mechanical seal structure of the compressor shaft end in this embodiment are as follows:

[0038] When the compressor 3 is in a shutdown state, especially when it is in a shutdown state for a long time, the oil storage chamber 7 stores refrigerant oil in the part below the position of the rotor gap 12 or the part below the position of the oil drain hole, and the lower part or most of the dynamic ring 5 and the lower part or most of the static ring 6 are always immersed in the refrigerant oil in the oil storage chamber 7.

[0039] When the compressor 3 is started, since the lower parts of the dynamic ring 5 and the lower parts of the static ring 6 are always immersed in the refrigeration oil in the oil storage chamber 7, the dynamic ring 5 is driven to rotate synchronously with the rotation of the compressor rotor 9, and the dynamic ring 5 brings the refrigeration oil in the oil storage chamber 7 to the entire mechanical sealing surface. The mechanical sealing surface in contact with the dynamic ring 5 and the static ring 6 can be cooled and lubricated by the refrigeration oil synchronously with the start of the compressor 3, ensuring that there is refrigeration oil when the dynamic ring 5 starts to rub on the static ring 6. The mechanical sealing surface in contact with the dynamic ring 5 and the static ring 6 is lubricated and cooled from the moment the compressor 3 is started, which effectively solves the problem that the mechanical seal is burned due to lack of cooling and lubrication of the refrigeration oil when the compressor 3 is started; at the same time, the refrigeration oil input from the outside for cooling and lubrication is transported through the external high-pressure oil supply pipe. It is sent to the oil supply ring cavity 11, and the refrigerant oil is sprayed through the oil nozzle 4 to the mechanical sealing surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing plane 61 of the static ring 6, thereby further continuously lubricating and cooling the mechanical sealing surface in contact with the dynamic ring 5 and the static ring 6; as the compressor rotor 9 rotates at high speed, the lip seal 8 is subjected to the pressure difference. Under the sealing action of the lip seal 8, the refrigerant oil sprayed out from the oil nozzle 4 is continuously accumulated in the oil storage cavity 7 until the liquid level in the oil storage cavity 7 is higher than the oil drain hole of the oil storage cavity 7, and the excess refrigerant oil is discharged from the oil storage cavity 7 through the oil drain hole, so that the refrigerant oil in the oil storage cavity 7 is continuously replaced, thereby further reducing the temperature of the refrigerant oil in the oil storage cavity 7, and having a better cooling and lubricating effect on the mechanical sealing surface in contact with the dynamic ring 5 and the static ring 6.

[0040] When the compressor 3 is started and is in normal operation, the refrigerant oil is continuously transported to the oil supply ring cavity 11 through the external high-pressure oil supply pipe, and the refrigerant oil is continuously sprayed through the oil nozzle 4 to the mechanical sealing surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing plane 61 of the static ring 6, which is used to continuously lubricate and cool the mechanical sealing surface in contact with the dynamic ring 5 and the static ring 6. The excess refrigerant oil in the oil storage cavity 7 is discharged through the oil drain hole. At the same time, the refrigerant oil is supplied to the bearing cavity of the compressor 3 and the compressor rotor 9 through the internal oil channel, and is discharged from the compressor 3 with the gas, and the refrigerant oil and the refrigerant are separated by the oil separator. After the circulation, the refrigerant oil returns to the oil supply ring cavity 11, and then enters the oil storage cavity 7 again through the oil nozzle 4 to realize the recycling of the refrigerant oil.

[0041] When the compressor 3 is turned off, the compressor rotor 9 loses driving force and gradually stops rotating. At the same time, the external high-pressure oil supply pipe stops supplying refrigerant oil to the oil supply ring cavity 11, and the oil nozzle 4 stops spraying refrigerant oil to the mechanical sealing surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing plane 61 of the static ring 6. The refrigerant oil stored in the oil storage cavity 7 continues to lubricate and cool the mechanical sealing surface between the dynamic ring 5 and the static ring 6 during the process of the compressor rotor 9 gradually stopping rotation until the compressor rotor 9 stops rotating.

[0042] Since the compressor rotor 9 stops rotating, the lip seal 8 loses the pressure difference, and there are two possibilities: 1. The lip seal 8 is not sealed tightly; 2. The lip seal 8 still has a stable sealing effect.

[0043] If the lip seal 8 is not sealed tightly, the refrigerant oil in the oil storage chamber 7 will gradually flow into the rotor chamber of the compressor housing 10 along the rotor gap 12, and the liquid level of the refrigerant oil in the oil storage chamber 7 will gradually decrease until it is flush with the bottom of the rotor gap 12. Since the bottom of the oil storage chamber 7 is lower than the bottom of the rotor gap 12, the refrigerant oil below the bottom of the rotor gap 12 is still stored in the oil storage chamber 7. At this time, the lower part of the oil storage chamber 7 is still storing refrigerant oil, and the lower part of the dynamic ring 5 and the lower part of the static ring 6 are always immersed in the refrigerant oil in the oil storage chamber 7, waiting for the next start of the compressor 3. When the compressor 3 is started next time, the refrigerant oil stored in the oil storage chamber 7 can simultaneously lubricate and cool the mechanical sealing surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing plane 61 of the static ring 6 at the moment the compressor 3 is started.

[0044] If the lip seal 8 still has a stable sealing effect, the refrigerant oil in the oil storage chamber 7 will not flow into the rotor chamber of the compressor housing 10 along the rotor gap 12. The refrigerant oil is stored in the oil storage chamber 7 below the oil drain hole. The parts of the dynamic ring 5 and the static ring 6 below the oil drain hole are always immersed in the refrigerant oil in the oil storage chamber 7, waiting for the next start of the compressor 3. When the compressor 3 is started next time, the refrigerant oil stored in the oil storage chamber 7 can simultaneously lubricate and cool the mechanical sealing surface formed by the contact between the sealing convex ring 51 on the dynamic ring 5 and the sealing plane 61 of the static ring 6 at the moment the compressor 3 is started.

[0045] In this embodiment, multiple oil injection ports 4 are evenly distributed on the outer circle of the mechanical sealing surface formed after the dynamic ring 5 and the static ring 6 contact. The oil injection direction of the oil injection port 4 is tangent to the outer circle of the mechanical sealing surface and follows the movement direction of the compressor rotor 9; the lower parts of the dynamic ring 5 and the static ring 6 are always immersed in the refrigeration oil in the oil storage chamber 7, ensuring that the mechanical seal is lubricated with refrigeration oil when friction begins, ensuring that the mechanical seal can be lubricated with refrigeration oil for a long time, and ensuring that the mechanical seal can operate for a long time.

[0046] The oil injection port 4 in this embodiment is a channel for the refrigeration oil to lubricate the mechanical seal. The utility model adopts multiple oil injection ports 4, and the oil injection direction of the oil injection port 4 is tangent to the outer circle of the mechanical seal surface, which greatly increases the lubrication and cooling effect of the refrigeration oil on the mechanical seal surface and reduces the impact on the dynamic ring 5.

[0047] The dynamic ring 5 and the static ring 6 in this embodiment are parts that constitute the mechanical seal. The dynamic ring 5 is installed on the compressor rotor 9, and the static ring 6 is installed on the compressor housing 10. The dynamic ring 5 and the static ring 6 form a mechanical seal, and an oil storage chamber 7 is designed in the compressor housing 10. The oil storage chamber 7 is used to store refrigerant oil, which can ensure that the dynamic ring 5 and the static ring 6 are always immersed in the refrigerant oil in the oil storage chamber 7.

[0048] The lip seal ring 8 in this embodiment is a structure that separates the interior of the compressor 3 from the mechanical seal. The lip of the lip seal ring 8 is located inside the compressor 3. Under the action of the high-pressure gas of the compressor 3, the lip edge of the lip seal ring 8 is in close contact with the compressor rotor 9 to achieve a sealing effect.

[0049] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is merely an example of the structure of the utility model. Any equivalent changes or simple changes made based on the structure, features and principles described in the concept of the utility model patent are included in the scope of protection of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should fall within the scope of protection of the utility model.

Claims

1. A mechanical seal structure for a compressor shaft end, wherein a rotor cavity is provided in a compressor housing (10), a compressor rotor (9) is installed in the rotor cavity, an input end of the compressor rotor (9) extends outside the compressor housing (10) and is connected to a motor (1) via a coupling (2), and is characterized in that: The mechanical seal structure comprises a dynamic ring (5) provided with a sealing convex ring (51), a static ring (6) provided with a sealing plane (61), and a lip seal ring (8); an oil storage cavity (7) and an oil supply ring cavity (11) are further provided in the compressor housing (10); an oil drain hole is provided in the upper half of the oil storage cavity (7); the oil storage cavity (7) and the rotor cavity are separated by a separating convex ring (13); a rotor gap (12) exists between the separating convex ring (13) and the compressor rotor (9); the lip seal ring (8) is installed between the separating convex ring (13) and the compressor rotor (9); the dynamic ring (5) and the static ring (6) are both located in the oil storage cavity (7); the dynamic ring (5) and the compressor rotor (9) are fixed; the static ring (6) and the compressor The housing (10) is fixed, the sealing convex ring (51) on the dynamic ring (5) is pressed against the sealing plane (61) of the static ring (6) to form a mechanical sealing surface, the bottom of the oil storage cavity (7) is lower than the bottom of the rotor gap (12), and the bottom of the mechanical sealing surface is lower than the bottom of the rotor gap (12); the inlet of the oil supply ring cavity (11) is connected to the external high-pressure oil supply pipe, and the wall between the oil supply ring cavity (11) and the oil storage cavity (7) is provided with a plurality of oil injection ports (4), the oil supply ring cavity (11) is connected to the oil storage cavity (7) through the oil injection ports (4), the oil injection ports (4) are arranged obliquely, and the outlet of the oil injection port (4) is aligned with the mechanical sealing surface formed after the sealing convex ring (51) on the dynamic ring (5) and the sealing plane (61) of the static ring (6) contact each other.

2. A mechanical seal structure for a compressor shaft end according to claim 1, characterized in that: Each fuel injection port (4) comprises two sections with different diameters, the inlet of the fuel injection port (4) is located at the section with the thicker diameter, and the outlet of the fuel injection port (4) is located at the section with the thinner diameter.

3. The mechanical seal structure for a compressor shaft end according to claim 1, characterized in that: A plurality of oil injection ports (4) are evenly distributed around the mechanical sealing surface formed by the contact between the sealing convex ring (51) on the dynamic ring (5) and the sealing plane (61) of the static ring (6), and the oil injection direction of each oil injection port (4) is tangent to the mechanical sealing surface.

4. The mechanical seal structure for a compressor shaft end according to claim 1, characterized in that: The number of the fuel injection ports (4) is 4 to 20.

5. The mechanical seal structure for a compressor shaft end according to claim 2, characterized in that: The outlet of the oil injection port (4) is close to a mechanical sealing surface formed by contact between the sealing convex ring (51) on the dynamic ring (5) and the sealing plane (61) of the static ring (6).

6. The mechanical seal structure for a compressor shaft end according to claim 1, characterized in that: The separating convex ring (13) and the compressor housing (10) are an integrated structure.

7. The mechanical seal structure for a compressor shaft end according to claim 1, characterized in that: The lip edge of the lip seal ring (8) is in close contact with the compressor rotor (9).

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