Bidirectional elastic compensation mechanical sealing device

Abstract

The utility model discloses a two-way elastic compensation mechanical sealing device which comprises a main shaft, a front end cover and a rear end cover are arranged at the two ends of the main shaft respectively, mechanical sealing parts corresponding to the front end cover and the rear end cover in an abutting mode are arranged at the two ends of the outer portion of the main shaft respectively, and an elastic compensation piece is arranged between the mechanical sealing parts at the two ends. The elastic compensation piece is elastically propped against the mechanical sealing parts at the two ends respectively; the axial compensation elastic force can be applied to the movable parts in the mechanical sealing parts at the two ends of the main shaft, even if the movable parts are abraded, the movable parts can be tightly pressed and attached to the static parts through the elastic force, and therefore the sealing performance of the ends of the main shaft is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of shaft end sealing relates to a two -way elastic compensation's mechanical seal device. BACKGROUND

[0002] In many mechanical equipment, in order to protect the main shaft, avoid the main shaft abrasion, need to place the main shaft in relatively sealed environment, avoid the direct contact of external impurities with the main shaft. Therefore, the end of the main shaft needs to be sealed. In the prior art, the commonly used structure for sealing the end of the main shaft includes a shaft seal ring or a shaft mechanical seal assembly. Compared with the shaft seal ring, the shaft mechanical seal assembly has better anti-aging property and longer service life. However, the shaft mechanical seal assembly has a problem, that is, the moving part and the static part in the shaft mechanical seal assembly are always in close contact and relative rotating friction condition, which leads to wear of the moving part in the shaft mechanical seal assembly after long time use, and further leads to the end face between the moving part and the static part no longer close contact, finally affecting the sealing property of the end of the main shaft. In the prior art, once the moving part in the shaft mechanical seal assembly is worn, the shaft mechanical seal assembly needs to be replaced, and the disassembly and maintenance process is very complicated.

[0003] Therefore, in view of the defect that the existing shaft mechanical seal assembly is worn after long time use and leads to reduced sealing property, the utility model discloses a two-way elastic compensation mechanical seal device. UTILITY MODEL CONTENTS

[0004] The utility model discloses a two-way elastic compensation mechanical seal device, can exert the elastic force of axial compensation to the moving part in the mechanical seal part of the both ends of the main shaft, even if the moving part is worn, also can press the moving part tightly and contact on the static part through the elastic force, and further guarantee the sealing property of the end of the main shaft.

[0005] The utility model discloses a two-way elastic compensation mechanical seal device, can exert the elastic force of axial compensation to the moving part in the mechanical seal part of the both ends of the main shaft, even if the moving part is worn, also can press the moving part tightly and contact on the static part through the elastic force, and further guarantee the sealing property of the end of the main shaft.

[0006] A two-way elastic compensation mechanical seal device, comprising a main shaft, the both ends of the main shaft are respectively provided with front end covers and rear end covers, the outer ends of the main shaft are respectively provided with mechanical seal parts corresponding to the front end covers and the rear end covers, and elastic compensation members are arranged between the mechanical seal parts at the two ends.

[0007] The mechanical seal parts at both ends of the main shaft abut against the front end cover and the rear end cover respectively to realize mechanical sealing of both ends of the main shaft, and the elastic compensation member is arranged between the mechanical seal parts at both ends to top the mechanical seal parts at both ends of the main shaft towards the front end cover and the rear end cover respectively by the elastic force of the elastic compensation member, so that the mechanical seal parts are tightly pressed by the elastic force of the elastic compensation member even if the mechanical seal parts are worn in the long-time use process, and the sealing performance of the mechanical seal parts is ensured.

[0008] To better realize the utility model, further, the elastic compensation member comprises a first axial elastic member, a second axial elastic member and an intermediate connecting sleeve, the intermediate connecting sleeve is sleeved on the shaft segment between the front end cover and the rear end cover outside the main shaft, one end of the intermediate connecting sleeve abuts against the mechanical seal part close to the front end cover through the first axial elastic member, and the other end of the intermediate connecting sleeve abuts against the mechanical seal part close to the rear end cover through the second axial elastic member.

[0009] To better realize the utility model, further, the intermediate connecting sleeve comprises a first connecting sleeve, a second connecting sleeve and intermediate elastic compensation members, the first connecting sleeve and the second connecting sleeve are slidably sleeved outside the main shaft, and the intermediate elastic compensation members are connected and arranged uniformly in the circumferential direction between the first connecting sleeve and the second connecting sleeve, one end of the first connecting sleeve close to the front end cover abuts against the mechanical seal part through the first axial elastic member, and one end of the second connecting sleeve close to the rear end cover abuts against the mechanical seal part through the second axial elastic member.

[0010] To better realize the utility model, further, the first axial elastic member and the second axial elastic member are of the same structure.

[0011] To better realize the utility model, further, an anti-abrasion disc is arranged between the front end cover and the rear end cover, and the main shaft, the mechanical seal part and the elastic compensation member are located in the inner cavity of the anti-abrasion disc.

[0012] To better realize the utility model, further, a threaded hole in communication with the inner cavity is arranged on the side wall of the anti-abrasion disc, and a plug is threadedly and fittingly installed in the threaded hole.

[0013] To better realize the utility model, further, the mechanical seal part comprises a dynamic ring and a static ring sleeved outside the main shaft, a static ring mounting hole is arranged on the end face of the front end cover and the rear end cover, and the static ring mounting hole is connected with the outer ring surface of the static ring; one end of the static ring close to the elastic compensation member abuts against the dynamic ring, and the other end of the dynamic ring away from the static ring elastically abuts against the elastic compensation member.

[0014] In order to better realize the utility model, further, the dynamic ring is provided with a dynamic ring seat at one end away from the static ring, and the one end of the dynamic ring seat away from the static ring is in elastic abutment with the elastic compensation member.

[0015] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0016] The utility model discloses a elastic compensation member is arranged between the mechanical seal part of two ends of the main shaft, and the elastic compensation member is respectively used to the mechanical seal part of two ends of the main shaft and is used to the axial compensation of the elastic force, even if the dynamic ring in the mechanical seal part is worn, can also be through the elastic force provided by the elastic compensation member and is pressed to the static ring to the dynamic ring, make the sealing end surface of the dynamic ring and the sealing end surface of the static ring always be in the state of close adhesion, and then guarantee the sealing property of the main shaft end. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structural diagram of two-way elastic compensation's mechanical seal device;

[0018] Figure 2 It is the structural diagram of elastic compensation member;

[0019] Figure 3 It is the structural diagram of intermediate connecting sleeve;

[0020] Figure 4 It is the structural diagram of mechanical seal part;

[0021] Figure 5 It is Figure 2 A-A section view of.

[0022] Wherein: 1 - main shaft;2 - front end cover;3 - rear end cover;4 - mechanical seal part;5 - elastic compensation member;6 - anti-wear disc;7 - screw plug;41 - dynamic ring;42 - static ring;43 - dynamic ring seat;51 - first axial elastic member;52 - second axial elastic member;53 - intermediate connecting sleeve;531 - first connecting sleeve;532 - second connecting sleeve;533 - intermediate elastic compensation member. DETAILED DESCRIPTION

[0023] The following detailed description is all exemplary, and aims at providing further description to the utility model. Unless otherwise indicated, all the technical and scientific terms used in the utility model have the same meaning as that understood by the ordinary skilled in the art to which the utility model belongs.

[0024] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise expressly indicated by the present invention, the singular form is intended to include the plural form as well. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0025] For ease of description, the words "up," "down," "left," and "right" appearing in this utility model only indicate that they are consistent with the up, down, left, and right directions of the accompanying drawings themselves, and do not limit the structure. They are merely for the purpose of facilitating the description of this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0027] Example 1:

[0028] This embodiment provides a bidirectional elastically compensated mechanical seal device, such as... Figure 1 As shown, the spindle includes a main shaft 1, with a front end cover 2 and a rear end cover 3 respectively at both ends of the main shaft 1. Mechanical seals 4 are provided at both ends of the main shaft 1, corresponding to the front end cover 2 and the rear end cover 3 respectively. An elastic compensation member 5 is provided between the mechanical seals 4 at both ends, and the elastic compensation member 5 elastically abuts against the mechanical seals 4 at both ends respectively.

[0029] The front end of the elastic compensation member 5 elastically abuts against the mechanical seal part 4 close to the front end cover 2, and the rear end of the elastic compensation member 5 elastically abuts against the mechanical seal part 4 close to the rear end cover 3. The elastic force provided by the elastic compensation member 5 enables the mechanical seal part 4 to abut against the sealing surface of the front end cover 2 or the rear end cover 3 tightly, thereby ensuring the sealing of the end of the main shaft 1. In the working condition of long-time rotation of the main shaft 1, the moving part inside the mechanical seal part 4 wears along with the rotation of the main shaft 1, at which time the elastic force provided by the elastic compensation member 5 presses the moving part in the mechanical seal part 4 towards the static part, thereby ensuring the sealing of the mechanical seal part 4. Since the front and rear ends of the elastic compensation member 5 elastically abut against the mechanical seal part 4 at the front end cover 2 and the mechanical seal part 4 at the rear end cover 3 respectively, the elastic compensation member 5 synchronously realizes the bidirectional elastic compensation of the mechanical seal part 4 at the front and rear ends of the main shaft 1, thereby ensuring the sealing of the two ends of the main shaft 1.

[0030] Embodiment 2

[0031] A bidirectional elastic compensation mechanical seal device is improved based on Embodiment 1, as shown in Figure 2 The elastic compensation member 5 includes a first axial elastic member 51, a second axial elastic member 52, and an intermediate connecting sleeve member 53. The intermediate connecting sleeve member 53 is sleeved on the shaft segment between the front end cover 2 and the rear end cover 3 outside the main shaft 1. One end of the intermediate connecting sleeve member 53 abuts against the mechanical seal part 4 close to the front end cover 2 through the first axial elastic member 51, and the other end of the intermediate connecting sleeve member 53 abuts against the mechanical seal part 4 close to the rear end cover 3 through the second axial elastic member 52.

[0032] The intermediate connecting sleeve member 53 is sleeved outside the main shaft 1. One end of the intermediate connecting sleeve member 53 abuts against one end of the first axial elastic member 51, and the other end of the first axial elastic member 51 abuts against one end of the mechanical seal part 4 arranged corresponding to the front end cover 2. Similarly, the other end of the intermediate connecting sleeve member 53 abuts against one end of the second axial elastic member 52, and the other end of the second axial elastic member 52 abuts against one end of the mechanical seal part 4 arranged corresponding to the rear end cover 3. The axial elastic force provided by the first axial elastic member 51 and the second axial elastic member 52 presses the moving part in the mechanical seal part 4 towards the static part, thereby realizing the elastic compensation of the mechanical seal part 4 and ensuring that the moving part of the mechanical seal part 4 can always abut against the static part tightly, thereby ensuring the sealing of the two ends of the main shaft 1.

[0033] The other parts of this embodiment are the same as those of Embodiment 1, and thus will not be described again.

[0034] Embodiment 3

[0035] A bidirectional elastic compensation mechanical seal device is improved based on Embodiment 1 or 2, as shown in Figure 3 and Figure 5As shown, the intermediate connecting sleeve 53 comprises a first connecting sleeve 531, a second connecting sleeve 532, and intermediate elastic compensation members 533. The first connecting sleeve 531 and the second connecting sleeve 532 are sleeved on the outside of the main shaft 1, and a plurality of intermediate elastic compensation members 533 are arranged between the first connecting sleeve 531 and the second connecting sleeve 532 in a uniform manner in the circumferential direction. One end of the first connecting sleeve 531 close to the front end cover 2 abuts against the mechanical seal part 4 through the first axial elastic member 51, and one end of the second connecting sleeve 532 close to the rear end cover 3 abuts against the mechanical seal part 4 through the second axial elastic member 52.

[0036] The first connecting sleeve 531 and the second connecting sleeve 532 are the same in structure, and are arranged opposite to each other. Six groups of intermediate elastic compensation members 533 are arranged between the first connecting sleeve 531 and the second connecting sleeve 532 in the circumferential direction. By arranging the intermediate elastic compensation members 533, it is further ensured that the elastic compensation member 5 can have sufficient elastic force to axially elastically compensate the mechanical seal part 4.

[0037] Further, the intermediate elastic compensation member 533 is any one of a spring and a spring piece.

[0038] The other parts of the embodiment are the same as those of Embodiment 1 or 2, and thus will not be described herein again.

[0039] Embodiment 4:

[0040] A bidirectional elastic compensation mechanical seal device is improved on the basis of any one of Embodiments 1-3. The first axial elastic member 51 and the second axial elastic member 52 are the same in structure, and are any one of a spring and a spring piece.

[0041] The other parts of the embodiment are the same as those of any one of Embodiments 1-3, and thus will not be described herein again.

[0042] Embodiment 5:

[0043] A bidirectional elastic compensation mechanical seal device is improved on the basis of any one of Embodiments 1-4. As shown, Figure 1 The front end cover 2 and the rear end cover 3 are fixedly installed on the front end and the rear end of the wear-resistant disc 6 through connecting screws, and form a closed inner cavity through the front end cover 2, the rear end cover 3, and the wear-resistant disc 6. The main shaft 1, the mechanical seal part 4, and the elastic compensation member 5 are located in the inner cavity of the wear-resistant disc 6. Hydraulic oil is injected into the inner cavity, and the pressure of the hydraulic oil acts on the moving part of the mechanical seal part 4, and then cooperates with the elastic force of the elastic compensation member 5 to tightly push the moving part towards the static part.

[0044] Furthermore, the side wall of the anti-wear disc 6 is provided with a threaded hole that communicates with the inner cavity. A screw plug 7 is installed in the threaded hole through a threaded fit. By unscrewing the screw plug 7, hydraulic oil can be injected into the inner cavity. At the same time, the hydraulic oil also plays a lubricating role, reducing the wear of the moving part in the mechanical seal part 4.

[0045] The other parts of this embodiment are the same as any one of embodiments 1-4, so they will not be described again.

[0046] Example 6:

[0047] A bidirectional elastically compensated mechanical seal device, improved based on any one of embodiments 1-5, such as... Figure 4 As shown, the mechanical seal 4 includes a rotating ring 41 and a stationary ring 42 sleeved on the outside of the main shaft 1. The end faces of the front cover 2 and the rear cover 3 are provided with stationary ring mounting holes, which are fitted and connected to the outer ring surface of the stationary ring 42. The end of the stationary ring 42 near the elastic compensator 5 abuts against the rotating ring 41, while the end of the rotating ring 41 away from the stationary ring 42 elastically abuts against the elastic compensator 5. Under the elastic force of the elastic compensator 5 and the pressure of the hydraulic oil in the inner cavity, the end face of the rotating ring 41 tightly fits against the end face of the stationary ring 42 to form a mechanical seal structure, thereby sealing both ends of the main shaft 1.

[0048] Furthermore, a rotating ring seat 43 is provided at the end of the rotating ring 41 away from the stationary ring 42, and the end of the rotating ring seat 43 away from the stationary ring 42 elastically abuts against the elastic compensation member 5.

[0049] The other parts of this embodiment are the same as any one of embodiments 1-5, so they will not be described again.

[0050] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A bidirectional elastic compensation mechanical sealing device, comprising a main shaft (1), a front end cover (2) and a rear end cover (3) are arranged at both ends of the main shaft (1) respectively, characterized in that, The outer ends of the main shaft (1) are respectively provided with mechanical seal parts (4) abutting against the front end cover (2) and the rear end cover (3), and an elastic compensation part (5) is arranged between the mechanical seal parts (4) at the two ends.

2. A mechanical seal device with bi-directional elastic compensation according to claim 1, characterized in that, The elastic compensation part (5) comprises a first axial elastic part (51), a second axial elastic part (52) and an intermediate connecting sleeve part (53), the intermediate connecting sleeve part (53) is sleeved on the shaft segment between the front end cover (2) and the rear end cover (3) outside the main shaft (1), one end of the intermediate connecting sleeve part (53) abuts against the mechanical seal part (4) close to the front end cover (2) through the first axial elastic part (51), and the other end of the intermediate connecting sleeve part (53) abuts against the mechanical seal part (4) close to the rear end cover (3) through the second axial elastic part (52).

3. A bidirectional spring-compensated mechanical seal device according to claim 2, characterized in that The intermediate connecting sleeve part (53) comprises a first connecting sleeve (531), a second connecting sleeve (532) and intermediate elastic compensation parts (533), the first connecting sleeve (531) and the second connecting sleeve (532) are slidably sleeved outside the main shaft (1), and a plurality of intermediate elastic compensation parts (533) are uniformly arranged between the first connecting sleeve (531) and the second connecting sleeve (532) in the circumferential direction, one end of the first connecting sleeve (531) close to the front end cover (2) abuts against the mechanical seal part (4) through the first axial elastic part (51), and one end of the second connecting sleeve (532) close to the rear end cover (3) abuts against the mechanical seal part (4) through the second axial elastic part (52).

4. A mechanical seal device with bi-directional elastic compensation according to claim 3, characterized in that The first axial elastic part (51) and the second axial elastic part (52) are the same in structure.

5. A bidirectional spring-compensated mechanical seal device according to any one of claims 1-4, characterized in that, An anti-wear disc (6) is arranged between the front end cover (2) and the rear end cover (3), and the main shaft (1), the mechanical seal part (4) and the elastic compensation part (5) are located in the inner cavity of the anti-wear disc (6).

6. A bidirectional spring-compensated mechanical seal device according to claim 5, characterized in that A threaded hole in communication with the inner cavity is arranged on the side wall of the anti-wear disc (6), and a plug (7) is threadedly and fittingly installed in the threaded hole.

7. A bi-directionally resiliently-compensated mechanical seal device according to any one of claims 1-4, characterized in that, The mechanical seal part (4) comprises a dynamic ring (41) and a static ring (42) sleeved outside the main shaft (1), the end faces of the front end cover (2) and the rear end cover (3) are provided with static ring installation holes, the static ring installation holes are connected with the outer ring surface of the static ring (42), one end of the static ring (42) close to the elastic compensation part (5) abuts against the dynamic ring (41), and the other end of the dynamic ring (41) away from the static ring (42) elastically abuts against the elastic compensation part (5).

8. A bidirectional spring-compensated mechanical seal device according to claim 7, characterized in that The other end of the dynamic ring (41) away from the static ring (42) is provided with a dynamic ring seat (43), and the other end of the dynamic ring seat (43) away from the static ring (42) elastically abuts against the elastic compensation part (5).

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