Mechanical sealing device capable of preventing abrasive dust during dry operation

Abstract

The utility model particularly relates to a mechanical sealing device capable of preventing abrasive dust in dry operation, which is characterized in that an ash receiving disc comprises a horizontal part positioned below a first annular sealing surface and a vertical part connected to one end, close to a shaft sleeve, of the horizontal part, and divides a sealing cavity into an upper sealing cavity, a lower sealing cavity and a first channel communicated with the upper sealing cavity and the lower sealing cavity; the first channel is formed by gaps among the ash receiving disc, the shaft sleeve, the first movable ring and the first static ring, and a blocking structure for blocking communication of the upper sealing cavity and the lower sealing cavity is arranged at at least one position in the first channel in the communication direction from the first annular sealing face to the lower sealing cavity. The blocking structure can prevent abrasive dust generated by circumferential movement of the first movable ring relative to the first static ring from entering the sealing lower cavity through a gap between the vertical part of the ash blocking disc and the shaft sleeve to contaminate materials, and the abrasive dust prevention effect of the structure is further improved.

Description

Technical Field

[0001] The utility model relates to a mechanical sealing device, in particular to a dry-running anti-wear debris mechanical sealing device. Background Art

[0002] With the increasing requirements of the pharmaceutical industry for the sealing and aseptic environment of sterile drug manufacturing equipment, as well as the continuous changes in the operating positions of equipment, the filter-washer-dryer used for solid-liquid separation, solid cleaning and solid drying needs to have good sealing performance between the main shaft and the tank body during the forward and reverse rotation of the filter-washer-dryer, so that the inside of the tank is isolated from the external environment to ensure aseptic production conditions. During the operation of the dry-running mechanical seal, the wear debris generated by the relative friction of the dynamic and static rings poses a great risk of contamination to the materials in the tank. How to solve the risk of contamination of materials by mechanical seal wear debris is particularly important.

[0003] The utility model patent with application number CN201320395974.5 discloses a mechanical seal device, which is provided with an ash receiving pan below the static ring. The ash receiving pan is fixedly installed in the sealing cavity between the tank body and the shaft sleeve, so that the wear debris generated by the relative friction between the dynamic and static rings will not fall into the tank body and pollute the material. However, in the actual production operation process, the wear debris will still enter the tank body through the gap between the upper end of the ash receiving pan and the shaft sleeve and pollute the material. It is very important to improve the wear debris pollution of the existing mechanical seal. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a dry-running anti-wear debris mechanical sealing device.

[0005] The technical solution adopted by the utility model is as follows: a dry-running anti-wear debris mechanical sealing device, comprising a sleeve sleeved on the main shaft, one end of the sleeve being sealed and connected to the tank body through a head, the space between the sleeve and the tank body forming a sealing chamber, a first static ring and a first dynamic ring being arranged in the sealing chamber, the first dynamic ring being sleeved on the sleeve, the first static ring and the first dynamic ring being attached to form a first annular sealing surface, an ash receiving pan being arranged below the first annular sealing surface between the tank body and the sleeve,

[0006] The ash receiving pan includes a horizontal portion located below the first annular sealing surface and a vertical portion connected to the horizontal portion close to one end of the shaft sleeve.

[0007] The ash receiving pan divides the sealed cavity into a sealed upper cavity, a sealed lower cavity and a first passage connecting the sealed upper cavity and the sealed lower cavity. The gap between the ash receiving pan and the shaft sleeve and the first moving ring and the first stationary ring constitutes the first passage.

[0008] A blocking structure for blocking the communication between the upper sealing chamber and the lower sealing chamber is provided at at least one position in the first passage in the communication direction from the first annular sealing surface to the lower sealing chamber.

[0009] Preferably, the blocking structure forms a seal on at least one position of the first channel from the first annular sealing surface to the sealed lower chamber.

[0010] Preferably, the blocking structure is arranged between the upper end of the vertical portion and the shaft sleeve.

[0011] Preferably, a groove cooperating with the vertical portion is formed on the shaft sleeve, the upper end of the vertical portion is located in the groove and forms a gap therewith, and the blocking structure is located between the upper end of the vertical portion and the groove.

[0012] Preferably, a mounting ring groove is provided on the outer periphery of the upper end of the vertical portion away from the main shaft, and the blocking structure is a sealing ring located in the mounting ring groove, which forms a seal between the outer periphery of the upper end of the vertical portion and the inner periphery of the groove away from the main shaft.

[0013] Preferably, the sealing ring is a lip sealing ring.

[0014] Preferably, the horizontal portion is located below the first stationary ring and extends to have a connection end detachably fixedly connected to the tank body, and the first channel has a cleaning inlet and a cleaning outlet located between the upper end surface of the horizontal portion and the lower end surface of the first stationary ring.

[0015] Preferably, an annular protrusion extends from the upper end of the vertical portion toward the inner circumferential surface of the groove, and the mounting ring groove is located on the annular protrusion.

[0016] Preferably, one end of the sleeve away from the head is located in the tank body and has a threaded fitting section, and the crest of the thread of the threaded fitting section is a rounded transition.

[0017] Preferably, the thread bottom of the thread mating section is a rounded transition.

[0018] The beneficial effects of the utility model are as follows: the blocking structure can prevent the wear debris generated by the circumferential movement of the first dynamic ring relative to the first static ring from entering the sealed lower cavity through the gap between the vertical part of the ash baffle plate and the shaft sleeve to pollute the material, further improving the anti-wear debris effect of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0020] Figure 1 It is a front cross-sectional view of the overall structure of the embodiment of the utility model;

[0021] Figure 2 for Figure 1 A magnified view of the structure at center;

[0022] Figure 3 for Figure 1 A magnified view of the structure at B in the middle;

[0023] Figure 4 It is a top view of the overall structure of the embodiment of the utility model;

[0024] In the figure, 1, main shaft; 2, sleeve; 3, head; 4, tank body; 5, first static ring; 6, first dynamic ring; 7, ash tray; 21, groove; 22, threaded fitting section; 41, sealed upper chamber; 42, first channel; 43, sealed lower chamber; 71, horizontal part; 72, vertical part; 61, first annular sealing surface; 221, tooth top; 222, tooth bottom; 421, cleaning inlet; 422, cleaning outlet; 711, connecting end; 721, mounting ring groove; 722, annular protrusion; 7211, sealing ring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0027] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0028] like Figures 1 to 4As shown in the figure, in the embodiment of the utility model, a dry-running anti-wear debris mechanical sealing device comprises a sleeve 2 sleeved on the main shaft 1, one end of the sleeve 2 is sealed and connected to the tank body 4 through a head 3, the space between the sleeve 2 and the tank body 4 constitutes a sealing cavity, a first static ring 5 and a first dynamic ring 6 are arranged in the sealing cavity, the first dynamic ring 6 is sleeved on the sleeve 2, the first static ring 5 and the first dynamic ring 6 are attached to form a first annular sealing surface 61, an ash receiving pan 7 located below the first annular sealing surface 61 is arranged between the tank body 4 and the sleeve 2, and the ash receiving pan 7 includes a first ring 6 located below the first annular sealing surface 61. The ash receiving tray 7 comprises a horizontal portion 71 below the annular sealing surface 61 and a vertical portion 72 connected to the horizontal portion 71 near one end of the sleeve 2. The ash receiving tray 7 divides the sealing chamber into a sealing upper chamber 41, a sealing lower chamber 43 and a first channel 42 connecting the sealing upper chamber 41 and the sealing lower chamber 43. The gap between the ash receiving tray 7 and the sleeve 2 and the first moving ring 6 and the first stationary ring 5 constitutes the first channel 42. A blocking structure for blocking the connection between the sealing upper chamber 41 and the sealing lower chamber 43 is provided at at least one position in the first channel 42 in the communication direction from the first annular sealing surface 61 to the sealing lower chamber 43.

[0029] Through this arrangement, the blocking structure can prevent the wear debris generated by the circumferential movement of the first moving ring relative to the first stationary ring from entering the sealed lower cavity through the gap between the vertical part of the ash receiving pan and the shaft sleeve to pollute the material. On the basis of the original ash receiving pan, the anti-wear debris effect of this structure is further improved.

[0030] The blocking structure may be in the form of a convex portion that blocks at least part of the wear debris from passing through, or in the form of a sealing structure that is provided.

[0031] The blocking structure forms a seal on at least one position of the first channel 42 from the first annular sealing surface 61 to the sealed lower cavity 43 .

[0032] With this arrangement, the sealing form has a better blocking effect than the semi-open non-sealing form, and can completely prevent the wear debris from entering the sealed lower cavity through the gap between the vertical part of the ash retaining plate and the shaft sleeve to contaminate the material.

[0033] The blocking structure is arranged between the upper end of the vertical portion 72 and the shaft sleeve 2 .

[0034] Through this arrangement, the blocking structure is arranged between the vertical portion of the ash retaining plate and the shaft sleeve, which does not affect the connection stability of the blocking structure during the operation of the device. At the same time, it is arranged at the upper end of the vertical portion, which can reduce the passage path of the grinding chips and reduce the difficulty of cleaning the device.

[0035] The shaft sleeve 2 is provided with a groove 21 that matches the vertical portion 72 . The upper end of the vertical portion 72 is located in the groove 21 and forms a gap therewith. The blocking structure is located between the upper end of the vertical portion 72 and the groove 21 .

[0036] Through this arrangement, the blocking surface of the dust blocking tray is increased.

[0037] The upper end of the vertical portion 72 is provided with an installation ring groove 721 on the periphery away from the main shaft 1 . The blocking structure is a sealing ring 7211 located in the installation ring groove 721 . The sealing ring 7211 forms a seal between the outer peripheral surface of the upper end of the vertical portion 72 and the inner peripheral surface of the groove 21 away from the main shaft 1 .

[0038] Through this arrangement, the passage path of the wear debris is further reduced, thereby reducing the difficulty of cleaning the device.

[0039] The sealing ring 7211 is a lip-shaped sealing ring. Through this arrangement, the sealing performance and wear resistance of the barrier structure are further improved.

[0040] The horizontal portion 71 is located below the first stationary ring 5 and extends a connection end 711 that is detachably fixedly connected to the tank body 4. The first channel 42 has a cleaning inlet 421 and a cleaning outlet 422 located between the upper end surface of the horizontal portion 71 and the lower end surface of the first stationary ring 5. Through this arrangement, the barrier structure and the cleaning structure do not interfere with each other.

[0041] The upper end of the vertical portion 72 extends toward the inner circumference of the groove 21 with an annular protrusion 722, and the mounting annular groove 721 is located on the annular protrusion 722. This arrangement improves the connection stability between the blocking structure and the mounting annular groove.

[0042] One end of the sleeve 2 away from the sealing head 3 is located in the tank body 4 and has a threaded fitting section 22 . The crest 221 of the thread of the threaded fitting section 22 is a rounded transition.

[0043] The thread bottom 222 of the thread matching section 22 is a rounded transition.

[0044] This arrangement reduces the risk of abrasive debris generated during the thread engagement process, further ensuring the cleanliness of the material.

[0045] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A dry-running anti-wear debris mechanical seal device, comprising a sleeve (2) sleeved on a main shaft (1), one end of the sleeve (2) being sealedly connected to a tank body (4) through a head (3), a space between the sleeve (2) and the tank body (4) forming a sealed cavity, a first stationary ring (5) and a first dynamic ring (6) being arranged in the sealed cavity, the first dynamic ring (6) being sleeved on the sleeve (2), the first stationary ring (5) and the first dynamic ring (6) being attached to each other and forming a first annular sealing surface (61), an ash receiving pan (7) being arranged between the tank body (4) and the sleeve (2) and located below the first annular sealing surface (61), characterized in that: The ash receiving pan (7) comprises a horizontal portion (71) located below the first annular sealing surface (61) and a vertical portion (72) connected to the horizontal portion (71) and close to one end of the shaft sleeve (2). The ash receiving pan (7) divides the sealed cavity into a sealed upper cavity (41), a sealed lower cavity (43), and a first passage (42) connecting the sealed upper cavity (41) and the sealed lower cavity (43); the gap between the ash receiving pan (7) and the shaft sleeve (2) and the first moving ring (6) and the first stationary ring (5) constitutes the first passage (42). A blocking structure for blocking the communication between the upper sealing chamber (41) and the lower sealing chamber (43) is provided at at least one position in the first channel (42) in the communication direction from the first annular sealing surface (61) to the lower sealing chamber (43).

2. A dry-running anti-wear mechanical seal device according to claim 1, characterized in that: The blocking structure forms a seal on at least one position of the first channel (42) from the first annular sealing surface (61) to the sealed lower chamber (43).

3. A dry-running anti-wear mechanical seal device according to claim 1, characterized in that: The blocking structure is arranged between the upper end of the vertical portion (72) and the shaft sleeve (2).

4. A dry-running anti-wear mechanical seal device according to claim 1, 2 or 3, characterized in that: The shaft sleeve (2) is provided with a groove (21) that matches the vertical portion (72); the upper end of the vertical portion (72) is located in the groove (21) and forms a gap therewith; and the blocking structure is located between the upper end of the vertical portion (72) and the groove (21).

5. A dry-running anti-wear mechanical seal device according to claim 4, characterized in that: An installation annular groove (721) is provided on the outer periphery of the upper end of the vertical portion (72) away from the main shaft (1); the blocking structure is a sealing ring (7211) located in the installation annular groove (721); the sealing ring (7211) forms a seal between the outer periphery of the upper end of the vertical portion (72) and the inner periphery of the groove (21) away from the main shaft (1).

6. A dry-running anti-wear mechanical seal device according to claim 5, characterized in that: The sealing ring (7211) is a lip-shaped sealing ring.

7. A dry-running anti-wear mechanical seal device according to claim 4, characterized in that: The horizontal portion (71) is located below the first stationary ring (5) and extends to have a connection end (711) that is detachably fixedly connected to the tank body (4); the first channel (42) has a cleaning inlet (421) and a cleaning outlet (422) located between the upper end surface of the horizontal portion (71) and the lower end surface of the first stationary ring (5).

8. A dry-running anti-wear mechanical seal device according to claim 5, characterized in that: An annular convex portion (722) extends from the upper end of the vertical portion (72) toward the inner peripheral surface of the groove (21), and the mounting annular groove (721) is located on the annular convex portion (722).

9. A dry-running anti-wear mechanical seal device according to claim 1, characterized in that: One end of the shaft sleeve (2) away from the sealing head (3) is located in the tank body (4) and has a threaded fitting section (22), and the crest (221) of the thread of the threaded fitting section (22) is a rounded transition.

10. A dry-running anti-wear mechanical seal device according to claim 9, characterized in that: The thread bottom (222) of the thread matching section (22) is a rounded transition.

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