Mortise and tenon joint type floating carbon ring sealing structure

Abstract

The utility model belongs to the technical field of sealing, and particularly relates to a mortise and tenon joint type floating carbon ring sealing structure which comprises a shaft sleeve, a sealing body, a sealing ring, a constraint tension spring, an axial corrugated spring, an air inlet and a rotation stopping piece. The shaft sleeve is sleeved on the main shaft; the sealing body sleeves the outer side of the shaft sleeve and comprises an upper sealing shell and a lower sealing shell; three annular grooves of the same structure are formed in the inner diameter face of the sealing body. The sealing ring is arranged in the ring groove, and the sealing ring is radially divided into three petals which are connected in a mortise and tenon joint manner; a circle of throttling channel is arranged on the inner side of the sealing ring, a plurality of air holes are formed in the axial direction, and the air holes are communicated to the throttling groove; a dynamic pressure groove is formed in each air hole in the radial direction, the air holes are communicated with the throttling grooves and the dynamic pressure grooves respectively, and the launder and the dynamic pressure grooves generate the dynamic pressure effect. The binding tension spring is arranged on the periphery of the sealing ring; the axial corrugated spring is arranged on the axial side surface of the sealing ring; the air inlet is externally connected with an air source; and the head end of the rotation stopping sheet is embedded into the sealing ring, and the tail end of the rotation stopping sheet is fixed on the lower shell.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing, in particular to a mortise and tenon overlap type floating carbon ring sealing structure. Background Art

[0002] During the operation of the compressor, toxic and harmful process gas will be generated inside. If the compressor main shaft seal is not in place, the process gas will leak out along the shaft, so it is necessary to install a sealing structure on the shaft. In addition, the cavity of the compressor main shaft is relatively narrow, and conventional large-volume sealing mechanisms cannot be installed. Therefore, it is urgent to set up a sealing structure with a simple structure and easy installation to achieve process gas sealing on the shaft. Utility Model Content

[0003] In order to solve one of the above problems, the utility model provides a mortise and tenon overlap type floating carbon ring sealing structure, which is arranged on the shaft of the compressor and is used to seal the process gas inside the compressor, including a shaft sleeve, a sealing body, a sealing ring, a restraining tension spring, an axial corrugated spring, an air inlet and a stop plate.

[0004] A shaft sleeve, which is mounted on the main shaft;

[0005] The sealing body is sleeved on the outer side of the shaft sleeve and is a split structure, including an upper sealing shell and a lower sealing shell. The upper and lower sealing shells are fixed by taper pins and screws, wherein the upper sealing shell is fixed to the compressor shell by tightening screws; three annular grooves with the same structure are opened on the inner diameter surface of the sealing body, which are the first annular groove, the second annular groove and the third annular groove in sequence;

[0006] A sealing ring is arranged in the ring groove, and the number of the sealing rings matches the ring groove. The sealing ring is radially divided into three petals, and the ends of the adjacent petals are connected by mortise and tenon overlaps. A circle of throttling channels is arranged radially on the inner side of the sealing ring, and a plurality of air holes are arranged axially, and the air holes are connected to the throttling groove. A dynamic pressure groove is radially arranged at each air hole, and the air holes are respectively connected to the throttling groove and the dynamic pressure groove, and the flow groove and the dynamic pressure groove generate a dynamic pressure effect.

[0007] A restraining tension spring is arranged on the outer periphery of the sealing ring;

[0008] An axial corrugated spring is arranged on the axial side of the sealing ring and has an opening in the radial direction to separate it;

[0009] The air inlet is located between the first annular groove and the second annular groove in the upper sealing shell, connected to an external air source, and the air outlet is connected to the shaft sleeve;

[0010] The anti-rotation plate has a head end embedded in the sealing ring and a tail end fixed on the lower shell.

[0011] Furthermore, when fixing by tightening the screws, a gasket is sandwiched between the upper sealing shell and the compressor shell.

[0012] Furthermore, a circle of protrusions is arranged on the axial end surface of the sealing ring, forming a sealing surface on the axial side surface.

[0013] Furthermore, a semicircular groove is axially arranged on the outer side surface of the sealing ring for accommodating the binding tension spring.

[0014] The utility model has a simple structure, adopts a multi-petal sealing ring, and has mortise and tenon overlaps. The overlap contact surface has good sealing performance, and the petal structure makes installation more convenient. In addition, after the high-pressure gas enters from the air inlet, it enters the throttling groove and the dynamic pressure groove along the air hole, and generates a dynamic pressure effect under the action of the pressure difference, so that the leakage gap is small, the sealing performance is good, and the energy saving is good. It is suitable for low-speed compressors and stirring kettle seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 is a schematic diagram of the structure of the sealing ring;

[0017] Figure 3 is a schematic diagram of the cross-sectional structure of the sealing ring at the pore;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the sealing ring at the dynamic pressure groove.

[0019] Among them, 1. sealing ring; 2. restraining tension spring; 3. anti-rotation plate; 4. axial corrugated spring; 5. upper sealing shell; 6. tightening screw; 7. lower sealing shell; 8. taper pin; 9. screw; 10. gasket; 11. bushing; 12. compressor shell; 13. boss; 14. throttle groove; 15. dynamic pressure groove; 16. air hole; 17. coating; 18. semicircular groove. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] refer to Figure 1-4 The utility model provides a mortise and tenon overlap type floating carbon ring sealing structure, which is arranged on the shaft of the compressor and is used to seal the process gas inside the compressor, including a shaft sleeve 11, a sealing body, a sealing ring 1, a binding tension spring 2, an axial corrugated spring 4, an air inlet and a stop plate 3

[0022] A shaft sleeve 11 is sleeved on the main shaft, and the outer side of the shaft sleeve 11 has a high-hardness metal coating 17, a tungsten carbide layer;

[0023] The sealing body is sleeved on the outer side of the shaft sleeve 11, and is a split structure, including an upper sealing shell 5 and a lower sealing shell 7, and the upper and lower sealing shells 7 are fixed by a taper pin 8 and a screw 9, wherein the upper sealing shell 5 is fixed to the compressor shell 12 by a tightening screw 6; three annular grooves with the same structure are opened on the inner diameter surface of the sealing body, which are the first annular groove, the second annular groove and the third annular groove in sequence;

[0024] The sealing ring 1, i.e., the carbon ring, is arranged in the ring groove, and the number of the sealing ring 1 matches the ring groove. The sealing ring 1 is radially divided into three petals, and the ends of the adjacent petals are connected by mortise and tenon overlaps. A circle of throttling channels is arranged radially on the inner side of the sealing ring 1, and a plurality of air holes 16 are arranged axially, and the air holes 16 are connected to the throttling groove 14. A dynamic pressure groove 15 is radially arranged at each air hole 16, and the air hole 16 is respectively connected to the throttling groove 14 and the dynamic pressure groove 15, and the flow groove and the dynamic pressure groove 15 generate a dynamic pressure effect.

[0025] A restraining tension spring 2 is arranged on the outer periphery of the sealing ring 1;

[0026] The axial corrugated spring 4 is arranged on the axial side of the sealing ring 1 and has an opening in the radial direction as elastic compensation. It solves the problem that the traditional axial cylindrical spring cannot be installed. The axial corrugated spring 4 is used to make the side of the sealing ring 1 (the boss sealing surface) fit with the end face of the groove of the sealing ring 1 to form an auxiliary sealing interface. Under parking conditions, the sealing ring 1 can form a relatively good static seal through the closing force provided by the elastic compensation element and the high-precision matching surface. The compensation element stabilizes the carbon ring, and the carbon ring does not fluctuate when the pressure of the equipment decreases. The axial corrugated spring 4 fixes the position of the carbon ring

[0027] The air inlet is located between the first annular groove and the second annular groove in the upper sealing housing 5, connected to an external high-pressure air source, and the air outlet is connected to the shaft sleeve 11;

[0028] The anti-rotation piece 3 has a head end embedded in the sealing ring 1 and a tail end fixed on the lower shell to prevent the sealing ring 1 from rotating.

[0029] During assembly, install three axial corrugated springs, the lower sealing housing 7, the lower petal of the split carbon ring and the tension spring, then install the other petals, tighten the binding spring, install the sealing ring 1 anti-rotation plate 3, install the upper sealing housing 5, install the cone pin 8 and tighten with screws to close the upper and lower sealing housings 7. Install the gasket 10 and screw the assembled seal to the casing.

[0030] The utility model provides a new type of mortise and tenon overlap type three-petal carbon ring, which is mortise and tenon overlap type. When installed, it is formed into a whole ring by a circumferential tightening spring, and a stop plate 3 is assembled. The sealing working surface, that is, the inner circumferential surface of the inner hole is provided with a throttling groove 14 and a dynamic pressure groove 15 (spiral groove or T-shaped groove). When working, the inner diameter of the mortise and tenon overlap type sealing ring 1 is in a semi-contact state with the rotor (coated high-hardness sleeve 11). Since the coated high-hardness sleeve 11 has high precision, the carbon ring is mortise and tenon overlapped, and can slide circumferentially. The high-pressure gas from the air source into the air inlet, that is, the sealing air pressure enters and then enters the air hole 16, the throttling groove 14 and the dynamic pressure groove 15. The sealing air pressure is greater than the process gas, and a dynamic pressure effect is generated under the action of the pressure difference. The leakage gap is small and the sealing performance is good, so that the leakage of the intake pressure energy of the entire equipment is extremely small, saving energy.

[0031] As an improvement to the solution, a gasket 10 is sandwiched between the upper sealing housing 5 and the compressor housing when fixing by screws.

[0032] As an improvement to the solution, a circle of bosses 13 is provided on the axial end face of the sealing ring 1 to form a sealing surface on the axial side face. Increasing the sealing surface leads to a better sealing effect.

[0033] As an improvement to the solution, a semicircular groove 18 is axially arranged on the outer side surface of the sealing ring for accommodating the binding tension spring 2.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mortise and tenon lap joint floating carbon ring seal structure, arranged on the shaft of the compressor, used to seal the process gas inside the compressor, Features: Including, a shaft sleeve, a sealing body, a sealing ring, a restraining tension spring, an axial corrugated spring, an air inlet and a stop plate; A shaft sleeve, which is mounted on the main shaft; The sealing body is sleeved on the outer side of the shaft sleeve and is a split structure, including an upper sealing shell and a lower sealing shell. The upper and lower sealing shells are fixed by taper pins and screws, wherein the upper sealing shell is fixed to the compressor shell by tightening screws; three annular grooves with the same structure are opened on the inner diameter surface of the sealing body, which are the first annular groove, the second annular groove and the third annular groove in sequence; A sealing ring is arranged in the ring groove, and the number of the sealing rings matches the ring groove. The sealing ring is radially divided into three petals, and the ends of the adjacent petals are connected by mortise and tenon joints. A circle of throttling channels is arranged radially on the inner side of the sealing ring, and a plurality of air holes are arranged axially, and the air holes are connected to the throttling groove. A dynamic pressure groove is radially arranged at each air hole, and the air holes are respectively connected to the throttling groove and the dynamic pressure groove, and the flow groove and the dynamic pressure groove generate a dynamic pressure effect. A restraining tension spring is arranged on the outer periphery of the sealing ring; An axial corrugated spring is arranged on the axial side of the sealing ring and has an opening in the radial direction to separate it; The air inlet is located between the first annular groove and the second annular groove in the upper sealing shell, connected to an external air source, and the air outlet is connected to the shaft sleeve; The anti-rotation plate has a head end embedded in the sealing ring and a tail end fixed on the lower shell.

2. A mortise and tenon overlap floating carbon ring seal structure as claimed in claim 1, Features: When fixing by tightening the screws, a gasket is sandwiched between the upper sealing shell and the compressor shell.

3. A mortise and tenon overlap floating carbon ring seal structure as claimed in claim 1, Features: A circle of protrusions is arranged on the axial end face of the sealing ring, forming a sealing surface on the axial side face.

4. A mortise and tenon overlap type floating carbon ring seal structure as claimed in claim 1, Features: A semicircular groove is axially arranged on the outer side surface of the sealing ring for accommodating the binding tension spring.

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