Mechanical sealing device and drying machine

Abstract

The utility model adopts a mechanical sealing device and a drying machine. A shell in the mechanical sealing device is sleeved on a rotating shaft; the static ring is arranged on the shell in the circumferential direction of the rotating shaft. The rotating shaft is sleeved with the moving ring seat, and the moving ring seat rotates along with the rotating shaft; the moving ring is arranged on the moving ring seat in the circumferential direction of the rotating shaft; an elastic piece is arranged on the movable ring seat, and the elastic piece is configured to extend to a first extension position in a normal state so as to push the movable ring to the static ring, and a sealing structure is formed between the static ring and the movable ring; the elastic piece is further configured to stretch to a second stretching position when the rotating shaft is in the expansion stretching state so as to push the movable ring to the static ring, and a sealing structure is formed between the static ring and the movable ring; when the elastic piece is arranged at different extension positions, the sealing performance of the moving ring and the static ring can be guaranteed, that is, the elastic piece keeps the extension allowance, and the sealing performance of the static ring and the moving ring can still be kept when the rotating shaft extends due to high temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary sealing, in particular to a mechanical sealing device and a dryer. Background Art

[0002] A mechanical seal is a device that prevents fluid leakage by at least one pair of end faces perpendicular to the axis of rotation, which are kept in close contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal.

[0003] Mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reactors, compressors, etc. Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than the atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is necessary to prevent leakage.

[0004] However, in a high temperature environment, the sealing performance of the current mechanical seal is difficult to meet the requirements. Therefore, there is an urgent need for a mechanical sealing device and a dryer that can solve the above problems. Utility Model Content

[0005] In order to overcome the above-mentioned problems, the utility model provides a mechanical sealing device and a dryer, which can ensure the sealing performance of the dynamic ring and the static ring by setting the elastic member at different elongation positions. That is to say, the elastic member retains the elongation margin and can still maintain the sealing performance of the static ring and the dynamic ring when the rotating shaft is elongated due to high temperature.

[0006] In a first aspect, the present application provides a mechanical sealing device, which is applied to a rotating shaft, and the mechanical sealing device comprises:

[0007] A housing, wherein the housing is sleeved on the rotating shaft;

[0008] A stationary ring, arranged on the housing along the circumference of the rotating shaft;

[0009] A moving ring seat is sleeved on the rotating shaft and rotates along with the rotating shaft;

[0010] A dynamic ring, arranged on the dynamic ring seat along the circumference of the rotating shaft;

[0011] Among them, an elastic member is provided on the moving ring seat, and the elastic member is configured that under a normal state, the elastic member stretches to a first stretch position to push the moving ring onto the stationary ring and form a sealing structure between the stationary ring and the moving ring; the elastic member is also configured that when the rotating shaft is in an expanded and stretched state, the elastic member stretches to a second stretch position to push the moving ring onto the stationary ring and form a sealing structure between the stationary ring and the moving ring.

[0012] In some embodiments of the present application, the elongation of the elastic member in the first elongated position is less than the elongation of the elastic member in the second elongated position.

[0013] In some embodiments of the present application, the difference in elongation between the elastic member being in the first elongated position and the elastic member being in the second elongated position is 5-15 mm.

[0014] In some embodiments of the present application, the difference in elongation between the elastic member being in the first elongated position and the elastic member being in the second elongated position is 10 mm.

[0015] In some embodiments of the present application, the elastic member is a spring.

[0016] In some embodiments of the present application, a gap is provided between the dynamic ring seat and the housing, and the dynamic ring abuts against the static ring to close the gap, thereby forming a sealed cavity; a sealing liquid is provided in the sealed cavity.

[0017] In some embodiments of the present application, a first groove is provided on the shell, the first groove falls within the sealing cavity, a skeleton sealing structure is provided within the first groove, and the sealing liquid is filled into the first groove and contacts with the skeleton sealing structure.

[0018] In some embodiments of the present application, the dynamic ring seat has a fixed portion facing away from the side of the housing, and a clamping ring is provided on the side of the fixed portion facing away from the rotating shaft, and the clamping ring is used to clamp the dynamic ring seat onto the rotating shaft.

[0019] In some embodiments of the present application, the clamping ring includes a first sub-ring and a second sub-ring, the first sub-ring is sleeved on the fixing portion, and the second sub-ring is sleeved on the first sub-ring; wherein the contact surface between the first sub-ring and the second sub-ring is an inclined surface inclined to the axial direction of the rotating axis; the clamping ring also includes a bolt member, and the bolt member is used to lock the first sub-ring and the second sub-ring in the axial direction of the rotating axis, so that the second sub-ring locks the first sub-ring in a direction perpendicular to the rotating axis.

[0020] In a second aspect, the present application also provides a dryer, comprising the above-mentioned mechanical sealing device.

[0021] The beneficial effects of the utility model are as follows: the utility model adopts a mechanical sealing device and a dryer, the mechanical sealing device is applied on a rotating shaft, the mechanical sealing device comprises a shell, a stationary ring, a dynamic ring seat and a dynamic ring, the shell is sleeved on the rotating shaft; the stationary ring is arranged on the shell along the circumference of the rotating shaft; the dynamic ring seat is sleeved on the rotating shaft and rotates with the rotating shaft; the dynamic ring is arranged on the dynamic ring seat along the circumference of the rotating shaft; an elastic member is arranged on the dynamic ring seat, the elastic member is configured such that in a normal state, the elastic member is extended to a first extended position to push the dynamic ring onto the stationary ring and form a sealing structure between the stationary ring and the dynamic ring; the elastic member is also configured such that when the rotating shaft is in an expanded and extended state, the elastic member is extended to a second extended position to push the dynamic ring onto the stationary ring and form a sealing structure between the stationary ring and the dynamic ring; by setting the elastic member at different extended positions, the sealing performance of the dynamic ring and the stationary ring can be guaranteed, that is, the elastic member retains an extension margin so that the sealing performance of the stationary ring and the dynamic ring can still be maintained when the rotating shaft is extended due to high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a mechanical sealing device provided in one embodiment of the utility model;

[0023] Figure 2 The utility model provides an embodiment of Figure 1 Schematic diagram of the local A enlarged structure;

[0024] Figure 3 The utility model provides an embodiment of Figure 1 Schematic diagram of the local enlarged structure of B.

[0025] Specific element symbol description:

[0026] 100-rotating shaft, 200-housing, 210-stationary ring, 220-skeleton sealing structure, 230-first groove, 300-dynamic ring seat, 310-dynamic ring, 320-elastic member, 330-fixing part, 400-sealing chamber, 500-pressure ring, 510-first sub-ring, 520-second sub-ring, 530-bolt member. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiment of the utility model clearer, the technical scheme 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. The components of the embodiment of the utility model generally described and shown in the drawings here can be arranged and designed in various different configurations. The following detailed description of the embodiment of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiment of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In addition, terms such as "horizontal", "vertical", and "overhanging" do not require that the components are absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly tilted. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0029] Mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reactors, compressors, etc. Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks out through this gap. If the pressure inside the equipment is lower than the atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is necessary to prevent leakage.

[0030] When the rotating shaft and the mechanical seal are at high temperature, the rotating shaft is prone to expansion and contraction. When the rotating shaft is extended, the mechanical seal may fail. Especially when used in a dryer, the high operating temperature of the dryer may cause the rotating shaft to extend, which may lead to mechanical seal failure.

[0031] Therefore, the present application improves the traditional mechanical sealing device and dryer based on this.

[0032] See also Figure 1 and Figure 2 , Figure 1 FIG. 1 shows a schematic structural diagram of the mechanical sealing device provided in this embodiment. Figure 2 This embodiment provides Figure 1A schematic diagram of the enlarged structure of a local A of the embodiment; a mechanical sealing device is provided in this embodiment, and the mechanical sealing device is applied to a rotating shaft 100. The mechanical sealing device includes a housing 200, a stationary ring 210, a dynamic ring seat 300 and a dynamic ring 310. The housing 200 is sleeved on the rotating shaft 100; the stationary ring 210 is arranged on the housing 200 along the circumference of the rotating shaft 100; the dynamic ring seat 300 is sleeved on the rotating shaft 100 and rotates with the rotating shaft 100; the dynamic ring 310 is arranged on the dynamic ring seat along the circumference of the rotating shaft 100 300; an elastic member 320 is provided on the moving ring seat 300, and the elastic member 320 is configured that under normal conditions, the elastic member 320 extends to a first extended position to push the moving ring 310 onto the stationary ring 210, and a sealing structure is formed between the stationary ring 210 and the moving ring 310; the elastic member 320 is also configured that when the rotating shaft 100 is in an expanded and extended state, the elastic member 320 extends to a second extended position to push the moving ring 310 onto the stationary ring 210, and a sealing structure is formed between the stationary ring 210 and the moving ring 310.

[0033] It should be explained that the elastic member 320 extending to the first extended position or the second extended position can satisfy the pressure requirement between the dynamic ring 310 and the static ring 210 to meet the sealing performance.

[0034] It can be understood that by setting the elastic member 320 at different elongation positions, the sealing performance of the dynamic ring 310 and the static ring 210 can be guaranteed; that is, the elastic member 320 retains the elongation margin so that the sealing performance of the static ring 210 and the dynamic ring 310 can be maintained when the rotating shaft 100 is elongated due to high temperature.

[0035] In some embodiments of the present application, the elongation of the elastic member 320 in the first elongated position is less than the elongation of the elastic member 320 in the second elongated position.

[0036] In some embodiments of the present application, the difference in elongation between the elastic member 320 in the first elongated position and the elastic member 320 in the second elongated position is 5-15 mm. In other words, the elastic member 320 has an elongation margin of 5-15 mm.

[0037] In some embodiments of the present application, the difference in elongation between the elastic member 320 in the first elongated position and the elastic member 320 in the second elongated position is 10 mm, that is, the elastic member 320 has an elongation margin of 10 mm.

[0038] In some embodiments of the present application, the elastic member 320 of the present embodiment is a spring, that is, the spring can work normally within a certain deviation value range without affecting the normal use of the mechanical seal.

[0039] In some embodiments of this application, please continue to refer to Figure 2 In this embodiment, a gap is provided between the dynamic ring seat 300 and the housing, and the dynamic ring 310 and the static ring 210 are in contact to close the gap, thereby forming a sealed cavity 400; a sealing liquid is provided in the sealed cavity 400. In some embodiments, the sealing liquid is lubricating grease.

[0040] In some embodiments of this application, please continue to refer to Figure 2 In this embodiment, a first groove 230 is provided on the housing, and the first groove 230 falls in the sealing cavity 400. A skeleton sealing structure 220 is provided in the first groove 230, and the sealing liquid is filled into the first groove 230 and contacts the skeleton sealing structure 220. It is understandable that high-temperature lubricating grease needs to be injected into the sealing cavity 400 before operation to ensure that the skeleton oil seal operates for a long time under the action of the high-temperature lubricating grease.

[0041] It should be explained that the skeleton sealing structure 220 cooperates with the sealing liquid to form a skeleton oil seal. The skeleton oil seal is a typical representative of oil seals, also commonly referred to as shaft seals, oil seals or mechanical seals, and is mainly used to seal the rotating shaft 100. Its main function is to establish a sealing area between the rotating shaft 100 and the external environment, which not only prevents the entry of external media (such as dust, water, etc.), but also prevents the leakage of internal media (such as lubricating oil), thereby protecting the normal operation of the equipment. The skeleton plays a key role in the oil seal, similar to the steel bars in concrete components, which play a reinforcing effect, so that the oil seal can maintain its shape and tension.

[0042] In some embodiments of this application, please refer to Figure 3 , Figure 3 This embodiment provides Figure 1 The dynamic ring seat 300 of this embodiment has a fixing portion 330 facing away from the housing, and a clamping ring 500 is provided on the side of the fixing portion 330 facing away from the rotating shaft 100. The clamping ring 500 is used to clamp the dynamic ring seat 300 onto the rotating shaft 100. In other words, the clamping ring 500 can ensure the stability of the connection between the dynamic ring 310, the dynamic ring seat 300 and the rotating shaft 100.

[0043] In some embodiments of this application, please continue to refer to Figure 3The clamping ring 500 of this embodiment includes a first sub-ring 510 and a second sub-ring 520, the first sub-ring 510 is sleeved on the fixing portion 330, and the second sub-ring 520 is sleeved on the first sub-ring 510; wherein the contact surface between the first sub-ring 510 and the second sub-ring 520 is an inclined surface inclined to the axial direction of the rotating shaft 100; the clamping ring 500 also includes a bolt member 530, which is used to lock the first sub-ring 510 and the second sub-ring 520 in the axial direction of the rotating shaft 100, so that the second sub-ring 520 locks the first sub-ring 510 in a direction perpendicular to the rotating shaft 100.

[0044] It should be explained that, in the process of tightening the bolt member 530, the first sub-ring 510 and the second sub-ring 520 move closer to each other in the axial direction of the rotating shaft 100. Since the contact surface between the first sub-ring 510 and the second sub-ring 520 is an inclined surface, the second sub-ring 520 will generate a component force perpendicular to the rotating shaft 100 on the first sub-ring 510, so as to prompt the first sub-ring 510 to press the fixing part 330 onto the rotating shaft 100.

[0045] Furthermore, in order to better implement the mechanical sealing device provided in any of the above embodiments, based on the above mechanical sealing device, the present application also provides a dryer, including the above mechanical sealing device.

[0046] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only for example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0047] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0048] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more utility model embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0049] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0050] Each patent, patent application, patent application publication, and other materials, such as articles, books, specifications, publications, documents, etc., cited in this application is hereby incorporated by reference in its entirety, except for application history documents that are inconsistent with or conflicting with the content of this application, and documents that limit the broadest scope of the claims of this application (currently or later attached to this application). It should be noted that if the descriptions, definitions, and / or use of terms in the attached materials of this application are inconsistent or conflicting with the content of this application, the descriptions, definitions, and / or use of terms in this application shall prevail.

[0051] The technical solutions provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the present utility model. At the same time, for technicians in this field, according to the idea of ​​the present utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present utility model.

Claims

1. A mechanical sealing device, characterized in that: Applied on a rotating shaft, the mechanical sealing device comprises: A housing, wherein the housing is sleeved on the rotating shaft; A stationary ring, arranged on the housing along the circumference of the rotating shaft; A moving ring seat is sleeved on the rotating shaft and rotates along with the rotating shaft; A dynamic ring, arranged on the dynamic ring seat along the circumference of the rotating shaft; Among them, an elastic member is provided on the moving ring seat, and the elastic member is configured that under a normal state, the elastic member stretches to a first stretch position to push the moving ring onto the stationary ring and form a sealing structure between the stationary ring and the moving ring; the elastic member is also configured that when the rotating shaft is in an expanded and stretched state, the elastic member stretches to a second stretch position to push the moving ring onto the stationary ring and form a sealing structure between the stationary ring and the moving ring.

2. The mechanical sealing device according to claim 1, characterized in that: The extension amount of the elastic member in the first extended position is less than the extension amount of the elastic member in the second extended position.

3. The mechanical sealing device according to claim 2, characterized in that: The difference in elongation between the elastic member being in the first elongated position and the elastic member being in the second elongated position is 5-15 mm.

4. The mechanical sealing device according to claim 2, characterized in that: The difference in elongation between the elastic member being in the first elongated position and the elastic member being in the second elongated position is 10 mm.

5. The mechanical sealing device according to any one of claims 1 to 4, characterized in that: The elastic member is a spring.

6. The mechanical sealing device according to claim 1, characterized in that: A gap is arranged between the dynamic ring seat and the housing, and the dynamic ring closes the gap after abutting against the static ring, thereby forming a sealing cavity; a sealing liquid is arranged in the sealing cavity.

7. The mechanical sealing device according to claim 6, characterized in that: The shell is provided with a first groove, the first groove falls in the sealing cavity, a skeleton sealing structure is provided in the first groove, and the sealing liquid is filled into the first groove and contacts with the skeleton sealing structure.

8. The mechanical sealing device according to claim 1, characterized in that: The dynamic ring seat has a fixing portion facing away from the housing, and a clamping ring is provided on the side of the fixing portion facing away from the rotating shaft. The clamping ring is used to clamp the dynamic ring seat onto the rotating shaft.

9. The mechanical sealing device according to claim 8, characterized in that: The clamping ring includes a first sub-ring and a second sub-ring, the first sub-ring is sleeved on the fixing portion, and the second sub-ring is sleeved on the first sub-ring; wherein the contact surface between the first sub-ring and the second sub-ring is an inclined surface inclined to the axial direction of the rotating shaft; the clamping ring also includes a bolt member, and the bolt member is used to lock the first sub-ring and the second sub-ring in the axial direction of the rotating shaft, so that the second sub-ring locks the first sub-ring in a direction perpendicular to the rotating shaft.

10. A dryer, characterized in that: A mechanical sealing device comprising any one of claims 1 to 9.

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