Shaft end mechanical seal

Abstract

The utility model discloses a shaft end mechanical seal, which relates to the technical field of mechanical seals and comprises a shaft sleeve, a medium side seal and an air side seal, a locking ring and a connecting flange are respectively sleeved at two ends of the shaft sleeve, and the medium side seal comprises a medium side moving ring and a medium side static ring which are sleeved at one end of the shaft sleeve close to the locking ring. The air side seal comprises an air side static ring and an air side moving ring which sleeve one end, close to the connecting flange, of the shaft sleeve; a pumping ring sleeves the outer side of the circumference of the shaft sleeve and is located between the medium side static ring and the air side moving ring, a sealing seat sleeves the outer side of the circumference of the pumping ring, and an end face gland sleeves one end, close to the connecting flange, of the shaft sleeve. According to the utility model, through precise matching of various elements such as two-way double sealing, the pumping ring, the sealing seat and the spring, excellent sealing performance in a high-pressure and two-way flowing working environment is ensured, a reliable sealing effect can be provided under high-pressure and low-pressure conditions, and isolation between fluid and the external environment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, specifically, relate to a shaft end mechanical seal. BACKGROUND

[0002] For the industrial equipment that needs efficient sealing and bears high pressure environment, such as hydraulic pump, reciprocating pump, compressor, chemical equipment and the like. These devices in the working process, fluid medium usually will face high pressure, big temperature difference and in the switching between positive and negative flow conditions, need to ensure that the sealing system must have strong sealing ability, wear resistance, corrosion resistance and long-term stable performance.

[0003] However, the traditional mechanical seal often has the problems of incomplete sealing, aggravated wear and tear, leakage and the like, especially in the face of high pressure and bidirectional flow, the traditional design cannot meet the requirements of two-side pressure balance and sealing performance at the same time. For example, the common shaft end mechanical seal mostly relies on single-sided sealing or simplified double-sided sealing design, although it can meet the requirements of part of low pressure or unidirectional flow occasions, but in the face of high pressure, large flow and bidirectional flow and other complex working conditions, its sealing design often cannot effectively cope with it.

[0004] The main deficiencies mainly reflect the following aspects: the sealing effect is unstable, with the change of working pressure, the sealing ring is easy to appear wear, leakage and poor sealing phenomenon, especially in the bidirectional flow environment, it is impossible to maintain good sealing performance; in the high pressure environment, the unidirectional sealing design is easy to cause sealing failure when the fluid flows in the opposite direction, causing damage to the equipment or medium leakage.

[0005] In view of the problems in the related art, no effective solution has been proposed so far. CONTENT OF THE UTILITY MODEL

[0006] In view of the problems in the related art, the utility model provides a shaft end mechanical seal to overcome the above technical problems existing in the prior art.

[0007] Therefore, the utility model adopts the specific technical scheme as follows:

[0008] A kind of shaft end mechanical seal, including shaft sleeve, medium side seal and air side seal, shaft sleeve both ends are respectively equipped with locking ring and connecting flange, medium side seal includes the medium side dynamic ring and medium side static ring of the shaft sleeve being equipped with close to locking ring one end, air side seal includes the air side static ring and air side dynamic ring of the shaft sleeve being equipped with close to connecting flange one end;Shaft sleeve circumferential outside and located between medium side static ring and air side dynamic ring are equipped with pumping ring, pumping ring circumferential outside is equipped with sealing seat, and the end face gland of the shaft sleeve close to the connecting flange one end is equipped with.

[0009] Further, in order to prevent the medium (such as liquid or gas) from leaking from the working cavity of the device to the external environment, or to prevent the external gas or contaminants from entering the working cavity, the sealing seat is located outside the medium-side moving ring, the medium-side static ring, the pumping ring, the air-side moving ring and the air-side static ring, and the end face of the sealing seat is bolted with the end face gland.

[0010] Further, in order to prevent the liquid or gas medium from leaking from the sealing area to the external environment, withstand the pressure from the high-pressure medium, ensure the sealing of the sealing area by the cooperation of the medium-side moving ring, the medium-side static ring and the O-ring and the spring, the medium-side static ring seat is arranged on the circumferential inner side of the sealing seat and cooperates with the medium-side static ring, the medium-side spring is arranged between the end face of the medium-side static ring away from the medium-side moving ring and the end face of the medium-side static ring seat, the medium-side moving ring O-ring is arranged between the circumferential outer side of the medium-side moving ring and the locking ring, and the medium-side static ring O-ring is arranged between the circumferential outer side of the medium-side static ring and the medium-side static ring seat.

[0011] Further, in order to prevent the air contaminants or external gas from entering the sealing area, withstand the lower pressure or air pressure, the air-side sealing and the medium-side sealing form a relatively independent sealing system, the air-side static ring seat is arranged on the circumferential inner side of the end face gland and cooperates with the air-side static ring, the air-side spring is arranged between the end face of the air-side static ring away from the air-side moving ring and the end face of the air-side static ring seat, the air-side moving ring O-ring is arranged between the circumferential outer side of the air-side moving ring and the circumferential inner side of the pumping ring, and the air-side static ring O-ring is arranged between the circumferential outer side of the air-side static ring and the air-side static ring seat.

[0012] Further, in order to prevent the relative rotation between the pumping ring and the shaft sleeve, ensure the stability of the sealing system in bidirectional flow, and ensure the balance of the internal pressure of the sealing cavity between the pumping ring and the sealing cavity, prevent the high-pressure fluid from generating excessive pressure on the sealing surface, the sealing cavity is formed between the medium-side static ring and the air-side moving ring in the sealing seat, the pumping ring is located in the sealing cavity, and the anti-rotation pin is arranged between the pumping ring and the shaft sleeve.

[0013] The beneficial effects of the utility model are as follows:

[0014] 1. The accurate cooperation of various elements such as bidirectional double sealing, pumping ring, sealing seat and spring ensures excellent sealing performance in the high-pressure and bidirectional flow working environment; that is, the double protection of the medium-side sealing and the air-side sealing can provide reliable sealing effect under high pressure and low pressure conditions, and ensure the isolation of the fluid and the external environment.

[0015] 2. The use of the pumping ring helps to stabilize the pressure in the sealing cavity, thereby reducing the unevenness of the pressure between the sealing surfaces and improving the sealing effect; the anti-rotation pin ensures that the pumping ring does not rotate during the working process, thereby preventing sealing failure caused by relative rotation.

[0016] 3. By setting O-rings and springs in multiple locations, the distribution of sealing pressure is optimized, ensuring the stability of the sealing effect and enhancing fatigue resistance. It can adapt to the needs of bidirectional flow and is widely used in occasions that require switching between forward and reverse fluids (such as hydraulic systems, pump systems, etc.). Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a structural schematic diagram of a shaft end mechanical seal according to an embodiment of the present utility model.

[0019] In the picture:

[0020] 1. Bushing; 2. Locking ring; 3. Connecting flange; 4. Medium-side moving ring; 5. Medium-side stationary ring; 6. Air-side stationary ring; 7. Air-side moving ring; 8. Pumping ring; 9. Sealing seat; 10. End face gland; 11. Medium-side stationary ring seat; 12. Medium-side spring; 13. Medium-side moving ring O-ring; 14. Medium-side stationary ring O-ring; 15. Air-side stationary ring seat; 16. Air-side spring; 17. Air-side moving ring O-ring; 18. Sealing cavity; 19. Anti-rotation pin. Detailed Implementation

[0021] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0022] According to an embodiment of the present invention, a shaft end mechanical seal is provided.

[0023] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1As shown, the shaft end mechanical seal according to the embodiment of the utility model, including shaft sleeve 1, medium side seal and air side seal, its characterized in be that the shaft sleeve 1 both ends are respectively equipped with locking ring 2 and connecting flange 3, and the medium side seal includes the medium side dynamic ring 4 and the medium side static ring 5 of the shaft sleeve 1 one end close to locking ring 2, and the air side seal includes the air side static ring 6 and the air side dynamic ring 7 of the shaft sleeve 1 one end close to connecting flange 3, and the shaft sleeve 1 circumferential outside and between the medium side static ring 5 and the air side dynamic ring 7 are equipped with pumping ring 8, and the pumping ring 8 circumferential outside is equipped with seal seat 9, and the shaft sleeve 1 one end close to connecting flange 3 is equipped with end face gland 10.

[0024] By means of the above technical scheme, through the accurate cooperation of various elements such as bidirectional double sealing, pumping ring 8, seal seat 9 and spring, excellent sealing performance in a high-pressure and bidirectional flow working environment is ensured, that is, through the double protection of the medium side seal and the air side seal, reliable sealing effect can be provided under high-pressure and low-pressure conditions, and the isolation of fluid and external environment is ensured.

[0025] In one embodiment, for the above-mentioned seal seat 9, the seal seat 9 is located outside the medium side dynamic ring 4, the medium side static ring 5, the pumping ring 8, the air side dynamic ring 7 and the air side static ring 6, and the end face of the seal seat 9 is bolted with the end face gland 10, so as to prevent the medium (such as liquid or gas) from leaking from the working cavity of the equipment to the external environment, or prevent the external gas or contaminants from entering the working cavity.

[0026] In one embodiment, for the above-mentioned seal seat 9, the seal seat 9 is provided with a medium side static ring seat 11 matched with the medium side static ring 5 on the inner side of the circumference, a medium side spring 12 is arranged between the end face of the medium side static ring 5 away from the medium side dynamic ring 4 and the end face of the medium side static ring seat 11, a medium side dynamic ring O-ring 13 is arranged between the circumferential outer side of the medium side dynamic ring 4 and the locking ring 2, and a medium side static ring O-ring 14 is arranged between the circumferential outer side of the medium side static ring 5 and the medium side static ring seat 11, so as to prevent the liquid or gas medium from leaking from the sealing area to the external environment, bear the pressure from the high-pressure medium, and ensure the sealing property of the sealing area through the cooperation of the medium side dynamic ring 4, the medium side static ring 5 and the O-rings and springs.

[0027] In one embodiment, for the above-mentioned end face gland 10, the end face gland 10 is provided with an air side static ring seat 15 on the inner side of the circumference, which cooperates with the air side static ring 6. The end face of the air side static ring 6 away from the air side dynamic ring 7 is provided with an air side spring 16 between the end face of the air side static ring seat 15. The air side dynamic ring O-ring 17 is provided between the outer side of the circumference of the air side dynamic ring 7 and the inner side of the circumference of the pumping ring 8. The air side static ring O-ring is provided between the outer side of the circumference of the air side static ring 6 and the air side static ring seat 15, so as to prevent the entry of pollutants or external air in the air into the sealing area, to bear lower pressure or air pressure, and to form a relatively independent sealing system for the air side sealing and the medium side sealing.

[0028] In one embodiment, for the above-mentioned sealing seat 9, the sealing cavity 18 is formed between the medium side static ring 5 and the air side dynamic ring 7 inside the sealing seat 9. The pumping ring 8 is located inside the sealing cavity 18, and the anti-rotation pin 19 is provided between the pumping ring 8 and the shaft sleeve 1, so as to prevent the relative rotation between the pumping ring 8 and the shaft sleeve 1, to ensure the stability of the sealing system during bidirectional flow, and to ensure the balance of the pressure inside the sealing cavity 18 between the pumping ring 8 and the sealing cavity 18, so as to prevent the high-pressure fluid from generating excessive pressure on the sealing surface.

[0029] In order to facilitate the understanding of the above technical scheme of the utility model, the working principle or operation mode of the utility model in the actual process will be described in detail below.

[0030] In actual application, the shaft sleeve 1 drives the dynamic ring of the shaft end mechanical seal to move through rotation. The sealing seat 9 maintains the pressure and stability of the sealing areas on both sides by being connected with the end face gland 10. The following is the basic operation process of the shaft end mechanical seal:

[0031] 1. Medium flow: The fluid (such as liquid or gas) flows from one end of the shaft sleeve 1 into the medium side sealing area (including the medium side dynamic ring 4 and the medium side static ring 5). At this time, the sealing structure ensures that the fluid does not leak to the external environment. The two O-rings on the medium side provide effective sealing effect.

[0032] 2. Pressure transmission: The pressure of the fluid is transmitted through the pumping ring 8. The pumping ring plays a role in stabilizing fluid flow and reducing leakage. The sealing seat 9 and the end face gland 10 are connected by bolts to ensure that the sealing systems on both sides are tightly matched.

[0033] 3. Air side sealing: The fluid flows through the sealing cavity 18 and enters the air side sealing area (air side dynamic ring 7 and air side static ring 6). The O-ring on the air side and the air side spring 16 ensure that the sealing area works normally under lower pressure.

[0034] 4. Anti-reverse rotation: The anti-rotation pin 19 prevents the relative rotation between the pumping ring 8 and the shaft sleeve 1, ensuring the stability of the sealing system during bidirectional flow.

[0035] 5、Sealing cavity pressure control: the design between the pumping ring 8 and the sealing cavity 18 ensures the balance of the internal pressure of the sealing cavity, preventing excessive pressure of the high-pressure fluid on the sealing surface.

[0036] In summary, by virtue of the above technical scheme of the utility model, through the accurate cooperation of various elements such as bidirectional double sealing, the pumping ring 8, the sealing seat 9, the spring and the like, excellent sealing performance is ensured in the working environment of high pressure and bidirectional flow; that is, through the double protection of medium side sealing and air side sealing, reliable sealing effect can be provided under high pressure and low pressure conditions, ensuring the isolation of fluid and external environment. The use of the pumping ring 8 helps to stabilize the pressure in the sealing cavity 18, thereby reducing the unevenness of the pressure between the sealing surfaces and improving the sealing effect; the anti-rotation pin 19 ensures that the pumping ring does not rotate during the working process, preventing sealing failure caused by relative rotation. By setting O-rings and springs at multiple positions, the distribution of sealing pressure is optimized, the stability of the sealing effect is ensured, and fatigue resistance is enhanced, which can meet the needs of bidirectional flow and is widely applied to occasions requiring forward and reverse fluid switching (such as hydraulic systems, pump systems and the like).

[0037] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screw connection" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the above-mentioned terms in the utility model can be understood according to the specific meaning in the utility model by the person skilled in the art according to the specific situation.

[0038] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A shaft end mechanical seal comprising a bushing, a media side seal, and an air side seal, characterized by, The shaft sleeve is sleeved with a locking ring and a connecting flange at two ends respectively, the medium side seal includes a medium side dynamic ring and a medium side static ring sleeved at one end of the shaft sleeve close to the locking ring, and the air side seal includes an air side static ring and an air side dynamic ring sleeved at one end of the shaft sleeve close to the connecting flange. A pumping ring is sleeved on the outer side of the shaft sleeve in the medium side static ring and the air side dynamic ring, a sealing seat is sleeved on the outer side of the pumping ring, and an end face gland is sleeved at one end of the shaft sleeve close to the connecting flange.

2. A mechanical seal for a shaft end as claimed in claim 1, wherein The sealing seat is located outside the medium side dynamic ring, the medium side static ring, the pumping ring, the air side dynamic ring and the air side static ring, and the end face of the sealing seat is bolted with the end face gland.

3. A mechanical seal for a shaft end as claimed in claim 1, wherein The inner side of the sealing seat is provided with a medium side static ring seat matched with the medium side static ring, and a medium side spring is arranged between the end face of the medium side static ring away from the medium side dynamic ring and the end face of the medium side static ring seat.

4. A mechanical seal for a shaft end as claimed in claim 3, wherein A medium side dynamic ring O-ring is arranged between the outer side of the medium side dynamic ring and the locking ring, and a medium side static ring O-ring is arranged between the outer side of the medium side static ring and the medium side static ring seat.

5. A mechanical seal for a shaft end as defined in claim 1, wherein The inner side of the end face gland is provided with an air side static ring seat matched with the air side static ring, and an air side spring is arranged between the end face of the air side static ring away from the air side dynamic ring and the end face of the air side static ring seat.

6. A mechanical seal for a shaft end as claimed in claim 5, wherein An air side dynamic ring O-ring is arranged between the outer side of the air side dynamic ring and the inner side of the pumping ring, and an air side static ring O-ring is arranged between the outer side of the air side static ring and the air side static ring seat.

7. A mechanical seal for a shaft end as defined in claim 1, wherein A sealing cavity is formed between the medium side static ring and the air side dynamic ring in the inside of the sealing seat, the pumping ring is located in the inside of the sealing cavity, and an anti-rotation pin is arranged between the pumping ring and the shaft sleeve.

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