CN210372015U

CN210372015U - Spring type mechanical seal

Info

Publication number: CN210372015U
Application number: CN201921098949.4U
Authority: CN
Inventors: 黄虎
Original assignee: Jiangsu Keao Fluid Technology Co ltd
Current assignee: Gaodao Sealing Technology Suzhou Co ltd
Priority date: 2019-07-13
Filing date: 2019-07-13
Publication date: 2020-04-21
Anticipated expiration: 2029-07-13

Abstract

The utility model discloses a be applied to spring mechanical seal in the mechanical seal field, its structure includes spring holder, spring, ejector ring, rotating ring subassembly and quiet ring subassembly, be provided with the sealing ring between ejector ring and the rotating ring subassembly, the rotating ring subassembly is provided with the rotating ring linkage towards the push rod, the ejector ring is provided with the locating part towards the rotating ring subassembly, the locating part is provided with the rotating ring limit position towards inside, the rotating ring linkage cover is located in the rotating ring limit position, the locating part surrounds formation sealing ring standing groove with the terminal surface of rotating ring linkage. When the mechanical seal is in the working process, the movable ring assembly is subjected to pressure towards the axis and horizontal extrusion force given by the sealing ring and the push ring, the end part of the movable ring assembly, namely the movable ring linkage part, is balanced in stress under a high-pressure working environment, deformation of the connecting end part is avoided, and guarantee is provided for structural stability, so that a good laminating effect of the end surface under the high-pressure working environment is guaranteed, and guarantee is provided for transmission quality.

Description

Spring type mechanical seal

Technical Field

The utility model relates to a spring mechanical seal that machinery field used.

Background

The mechanical seal is a shaft seal device of rotary machinery, its structure is a seal device formed from a pair of or several pairs of plane friction formed from moving ring and static ring, and it is characterized by that it utilizes the pressure of elastic component and sealing medium to produce proper pressing force on the contact surface of the rotating moving ring and static ring to make these two end surfaces tightly contact. At this time, a very thin liquid film is maintained between the two contact end faces, thereby achieving the purpose of sealing. The liquid film has hydrodynamic and hydrostatic pressure, and acts as lubrication and balancing pressure.

In the connection process, the spring seat is connected with the push ring through the spring, and one end of the push ring is connected with the movable ring assembly through the cylindrical pin at the moment. To ensure the transmission effect, the end of the push ring is usually provided with an extension end and extends below the end of the movable ring component. At the moment, a sealing ring placing groove is formed between the end part of the push ring and the movable ring assembly, and the sealing ring is arranged among the push ring, the movable ring assembly and the rotating shaft, so that the sealing effect is achieved. This mechanical seal is in the use, and the spring holder passes through holding screw to be connected with the pivot, and when the rotation axis was rotatory, it was rotatory to push away the ring through holding screw and spring drive to it is rotatory to drive the ring. The rotation-preventing pin is fixed on the static gland to prevent the static ring from rotating. When the sealing end surface is abraded, the movable ring and the movable ring sealing ring generate micro movement along the axial direction under the pushing of the spring, and certain compensation capacity is achieved. In order to ensure the sealing effect, the upper surface of the end part of the push ring positioned below the movable ring component is tightly attached to the lower surface corresponding to the movable ring component. The tip of the rotating ring subassembly at this moment position receives a corresponding perpendicular ascending power, easily causes the terminal surface upset deformation in extrusion process, is unfavorable for effective the going on of transmission operation to reduce the sealed effect at connection position, also can produce adverse effect to the device life-span. In addition, in the assembling process of the mechanical seal, a worker sequentially sleeves the spring seat, the spring, the push ring, the sealing ring, the movable ring assembly, the static ring assembly and the gland. In addition, spring holder, spring, push away the ring, the sealing washer is installed on the transmission shaft, and the quiet ring subassembly that corresponds is located on the less installation axle of diameter with the gland cover. At the moment, the front end of the movable ring assembly and the push ring are connected on the transmission shaft in a sealing mode, and the rear end of the movable ring assembly and the static ring assembly are connected on the mounting shaft in a sealing mode. Because the spring is big spring, the axial displacement of compression is very big in the installation, pushes away the ring and moves to on the installation axle shaft diameter of quiet ring subassembly easily under the reset effort of big spring in the installation. The sealing washer and the front end of rotating ring subassembly also can move thereupon to installing on the axle diameter of axle this moment, in follow-up quiet ring subassembly and gland installation, because the diameter of installation axle ratio transmission shaft is little, then drop to installing epaxial sealing washer and hardly shift up smoothly to the transmission shaft under the installation thrust of quiet ring subassembly along the axis on, cause easily to press the sealing washer to break, lead to the damage of structure, and the effective seal installation of unfavorable equipment device. Meanwhile, when the mechanical seal is driven by a shifting fork, the front end of the movable ring assembly is pushed out by the spring acting force and falls onto the installation shaft, the shifting fork and the connecting notch corresponding to the push ring are easily staggered, and the ejection is easily caused in the subsequent installation process of the stationary ring assembly and the gland, so that the installation cannot be effectively carried out, and the connection efficiency of the device is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a technical problem provide an effective spring mechanical seal who guarantees structural stability.

The utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a spring type mechanical seal, includes spring holder, spring, ejector ring, rotating ring subassembly and quiet ring subassembly, be provided with the sealing ring between ejector ring and the rotating ring subassembly, the rotating ring subassembly is provided with the rotating ring linkage towards the push rod, the ejector ring is provided with the locating part towards the rotating ring subassembly, the locating part is provided with the rotating ring limit position towards inside, the rotating ring linkage cover is located in the rotating ring limit position, the up end of rotating ring linkage contacts with the lower terminal surface of rotating ring limit position, the locating part surrounds formation sealing ring standing groove with the terminal surface of rotating ring linkage, the sealing ring sets up in the sealing ring standing groove.

The push ring of the mechanical sealing structure is provided with a movable ring limiting position, and the movable ring linkage piece at the end part of the movable ring assembly is sleeved in the movable ring limiting position, namely the movable ring linkage piece is positioned between the rotating shaft and the limiting piece of the push ring. The limiting piece and the movable ring linkage piece form a ring groove, namely, a sealing ring placing groove is formed in a surrounding mode, and then the sealing ring is placed in the sealing ring placing groove. At this time, the sealing ring and the moving ring linkage member are both located at the structural position of the limiting member facing the rotating shaft, that is, the limiting member limits the positions of the sealing ring and the moving ring linkage member between the push ring and the rotating shaft. When the mechanical seal is in the working process, the movable ring is subjected to pressure towards the axis of the rotating shaft and horizontal extrusion force given by the sealing ring and the push ring, the end part of the movable ring assembly is balanced in stress, the end part deformation condition is avoided, the movable ring assembly can keep good fit of the end surface under a high-pressure working environment, and the continuous transmission effect of the mechanical seal assembly is effectively improved.

Furthermore, the sealing ring placing groove and the movable ring limiting position are distributed in a stepped mode along the axis of the push ring, and the end face of the sealing ring placing groove is close to the axis of the push ring.

Furthermore, the rotating ring assembly is provided with a shifting fork structure towards the push rod, the shifting fork structure is used for realizing transmission operation of the push ring and the rotating ring assembly, and the push ring is provided with a corresponding connecting notch towards the shifting fork structure.

Further, the throw-out collar is provided with joint spare, the spring holder be provided with joint spare matched with screens spare, joint spare and screens spare joint, joint spare and screens spare can be followed the axis direction realization relative movement of throw-out collar under the joint state, the joint spare can not exert an influence to the relative position of throw-out collar, sealing ring and rotating ring subassembly at the relative movement in-process with the screens spare.

Further, joint spare is "T" type structure, joint spare including towards the locating part the joint end and with joint end vertically draft arm, the screens piece is including the rectangle recess and two limiting plates that are used for placing the joint end, the limiting plate sets up in the opening part of rectangle recess perpendicularly relatively, form the removal opening that is less than joint end width and is greater than the draft arm width between two limiting plates, the degree of depth of rectangle recess and the length looks adaptation of draft arm.

Further, one side of the rectangular groove is provided with a connecting inlet, and the clamping end enters the rectangular groove along the connecting inlet.

The utility model has the advantages that:

1. the connection mode of the push ring, the sealing ring and the movable ring assembly ensures that the end part of the movable ring assembly, namely a movable ring linkage part, is stressed in a balanced manner in a high-pressure working environment, and avoids the deformation of the end part, so that a good laminating effect of the end surfaces of the parts in the high-pressure working environment is realized, and a guarantee is provided for a transmission effect;

2. the sealing ring placing groove and the movable ring limiting position are distributed in a stepped mode, so that the upper part of the end face, facing the push ring, of the movable ring linkage part is located in the movable ring limiting position, namely the upper part of the end face is in contact with the push ring, the lower part of the end face is matched with the limiting part to surround to form the sealing ring placing groove, namely the lower part of the end face is in contact with the sealing ring, the sealing effect of the sealing ring is guaranteed, the effective stress surface of the end face of the movable ring assembly is increased, and the follow-up transmission quality is guaranteed;

3. due to the arrangement of the shifting fork structure, the reliability of transmission operation is improved, meanwhile, the pin holes are prevented from being damaged in the transmission process, and the guarantee is provided for the orderly transmission operation;

4. the spring holder can realize the joint through joint spare and screens piece with the throw-out collar, the connection stability between the part has been guaranteed, simultaneously in the spring mounting process usable this structure realize the structure location operation, avoided sealing washer and rotating ring subassembly to remove to quiet ring subassembly installation epaxial under the spring action power, subsequent structrual installation has been made things convenient for, guarantee is provided for the final installation effect of product, the embedded integrated configuration of joint of spring holder and throw-out collar, the installation effect of shift fork structure has also been improved, guarantee is provided for holistic transmission effect.

Drawings

Fig. 1 is a sectional view of the overall structure of the spring type mechanical seal of the present invention, wherein the mechanical seal is connected with a rotating shaft;

FIG. 2 is an enlarged view of the structure of the area A in FIG. 1;

fig. 3 is a schematic structural view of a push ring of a spring type mechanical seal of the present invention;

FIG. 4 is a schematic structural view of the clip member shown in FIG. 3 along the direction K;

fig. 5 is a schematic structural diagram of a spring seat of a spring type mechanical seal according to the present invention;

labeled as: spring holder 1, screens piece 11, rectangle recess 111, limiting plate 112, remove opening 113, spring 2, throw-out collar 3, locating part 31, rotating ring limit position 311, joint piece 32, joint end 321, draft arm 322, rotating ring subassembly 4, rotating ring linkage 41, quiet ring subassembly 5, sealing ring 6, sealing ring standing groove 61, shift fork structure 7, holding screw 8, pivot 9.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

The sectional view of the connection structure of the spring type mechanical seal and the rotating shaft 9 is shown in figure 1, and the mechanical seal cover is arranged on the rotating shaft 9. The mechanical seal comprises a spring seat 1, a spring 2, a push ring 3, a movable ring assembly 4 and a static ring assembly 5, wherein the spring seat 1 is connected with a rotating shaft 9 through a set screw 8. When the rotating shaft 9 rotates, the mechanical seal drives the push ring 3 to rotate through the set screw 8 and the spring 2, so as to drive the movable ring component 4 to rotate, and the static ring component 5 is fixed and does not rotate. In order to ensure the sealing effect of the mechanical seal, a plurality of sealing rings 6 are arranged in the mechanical seal, and as shown in fig. 2, in order to ensure the transmission and sealing effect of the push ring 3 and the movable ring component 4, the sealing rings 6 are arranged at the joints. The push ring 3 is provided with a limiting piece 31 towards the moving ring component 4, and the moving ring component 4 is provided with a moving ring linkage piece 4 corresponding to the moving ring component. As shown in the figure, the cross-sectional view of the limiting member 31 is a step-like structure, and at this time, the step position far from the axis of the push ring 3, i.e. the moving ring limiting position 311, is used for placing the moving ring linkage member 4, and the upper end surface of the moving ring linkage member 4 is in contact with the lower end surface of the moving ring limiting position 311. The section of the moving ring linkage 41 is a rectangular structure which is matched with the section of the moving ring limiting position 311. At this time, the movable ring linkage member 4 and the step position close to the axis of the push ring 3 surround to form a placing groove, namely the sealing ring placing groove 61, and the sealing ring 61 is placed in the sealing ring placing groove 61. The final connection state is as shown in fig. 2, the outer surface of the sealing ring 6 is respectively attached to the limiting piece 31 of the push ring 3, the movable ring linkage piece 41 and the rotating shaft 9, so that the transmission sealing quality is ensured.

In the above drawings, all the drawings are cross-sectional views, and it can be known from the characteristics of the mechanical sealing structure that the moving ring linkage 41, the limiting member 31 and the sealing ring 6 are all annular structures, and the corresponding moving ring limiting position 311 and the corresponding sealing ring placing groove 61 are also annular grooves. In the connection process of the parts, the mechanical seal assemblies need to be sleeved and combined in sequence. The structural shape of the connection part can be designed according to the requirement on the premise of meeting the connection effect of the movable ring limiting position 311 and the movable ring linkage part 41. The stepped distribution of the sealing ring placement groove 61 and the moving ring limiting position 311 ensures that the upper part of the end surface of the moving ring linkage 41 facing the push ring 3 is located in the moving ring limiting position 311, i.e. the upper part of the end surface is in contact with the push ring 3. The lower part of the end face is fitted with the stopper 31 to surround the seal ring placement groove 61, that is, the lower part of the end face is in contact with the inner seal ring 6. At the moment, the effective stress surface of the end surface of the movable ring component 4 is increased, and the subsequent transmission quality is guaranteed. When the mechanical seal is in the working process, the movable ring linkage part 41 of the movable ring component 4 is subjected to pressure towards the axis of the rotating shaft and horizontal extrusion force given by the sealing ring 6 and the push ring 3, the end part of the movable ring component 4 is stressed in a balanced manner, the end part deformation condition is avoided, the mechanical seal can keep good fit of the connection end surface under a high-pressure working environment, and continuous effective transmission operation of the mechanical seal component is effectively improved.

For improving mechanical seal's transmission quality, rotating ring subassembly 4 sets up shift fork mechanism 7 towards throw-out collar 3, and then utilizes the cooperation of shift fork structure 7 to realize the transmission between two positions, when improving transmission operation reliability, has avoided the destruction of the drive in-process to throw-out collar 3 and rotating ring subassembly 4 connecting pin hole, provides the guarantee for transmission operation's orderly going on.

In order to improve the installation and connection effects of the mechanical seal, the push ring 3 and the spring seat 1 are provided with a clamping piece 32 and a clamping piece 11 which are matched with each other. The structure of the push ring 3 is shown in fig. 3, and the structure of the snap-in piece 32 is shown in fig. 4. The engaging member 32 includes an engaging end 321 and a pulling arm 322, and the engaging end 321 and the pulling arm 322 are vertically arranged in a "T" shape. The structure of the clamping piece 11 on the spring seat 1 is shown in fig. 5, and the structure of the clamping piece includes a rectangular groove 111 and two limiting plates 112. The position-limiting plate 112 is disposed at the opening of the rectangular groove 111, and further forms a moving through opening 113 smaller than the width of the engaging end 321 and larger than the width of the pulling arm 322. Since the cross-sectional views of the engaging end 321 and the pulling arm 322 are regular rectangles, the engaging member 11 is configured to be a rectangular groove 11 and a regular rectangular moving opening 113 according to the shape. The shape of the clamping component can be selected according to requirements. In addition, the detent element 11 should be provided with a certain movable area, that is, the detent element 32 and the detent element 11 can realize relative movement along the axis of the push ring 3, so as to ensure the transmission quality in the transmission operation process. In fig. 5, the depth of the rectangular recess 111 is expanded, and the depth is adapted to the length of the pulling arm 322. When the snap ends 321 are located in the rectangular recesses 111, the pull arms 322 are moved a distance along the axis through the movement openings 113. The technician can make the change of the movable distance according to the technical requirements. In order to facilitate the connection between the engaging member 32 and the engaging member 11, a connection entrance may be disposed at one side of the rectangular groove 111, and the engaging end 321 enters the rectangular groove 111 along the connection entrance, so as to limit the position of the engaging end 321 by the limiting plate 112. When the mechanical seal is installed, the two ends of the spring 2 are respectively connected with the spring seat 1 and the push ring 3, and at the moment, the spring seat 1 and the push ring 3 realize clamping operation by utilizing the clamping piece 11 and the clamping piece 32. Spring holder 1, spring 2 and joint end 321 are the embedded integrated configuration of joint this moment, have made things convenient for subsequent installation. This screens 11 and joint 32's structure can carry out the selection setting of structure according to actual conditions, but should guarantee screens 11 and joint 32 can not say that subsequent rotating ring subassembly and the sealing ring 6 that corresponds push away to the installation epaxial of quiet ring subassembly 5 in the relative movement distance scope, thereby avoided push ring 3 to carry out the removal along the axial direction of perpendicular to with sealing ring 6 and rotating ring subassembly 4 under spring 2's effort, the dislocation of shift fork structure 7 with the corresponding notch of being connected of push ring 3 has been avoided, shift fork structure 7's installation transmission effect has been guaranteed, guarantee is provided for holistic mounting structure stability.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A spring type mechanical seal comprises a spring seat (1), a spring (2), a push ring (3) and a movable ring component (4), a sealing ring (6) is arranged between the push ring (3) and the movable ring component (4), it is characterized in that the movable ring component (4) is provided with a movable ring linkage piece (41) towards the push rod, the push ring (3) is provided with a limit piece (31) towards the movable ring component (4), the limiting piece (31) is provided with a moving ring limiting position (311) towards the inside, the moving ring linkage piece (41) is sleeved in the moving ring limiting position (311), the upper end surface of the movable ring linkage piece (41) is contacted with the lower end surface of the movable ring limiting position (311), the end faces of the limiting piece (31) and the movable ring linkage piece (41) are surrounded to form a sealing ring placing groove (61), and the sealing ring (6) is arranged in the sealing ring placing groove (61).

2. A spring type mechanical seal according to claim 1, wherein the sealing ring placement groove (61) and the rotating ring limiting position (311) are distributed in a stepped manner along the axis of the push ring (3), and the end surface of the sealing ring placement groove (61) is close to the axis of the push ring (3).

3. A spring type mechanical seal according to claim 1, characterized in that the rotating ring assembly (4) is provided with a shifting fork structure (7) towards the push ring (3), the shifting fork structure (7) is used for realizing transmission operation of the push ring (3) and the rotating ring assembly (4), and the push ring (3) is provided with a corresponding connection notch towards the shifting fork structure (7).

4. A spring type mechanical seal according to claim 1 or 3, characterized in that, the throw-out collar (3) is provided with joint piece (32), spring holder (1) is provided with joint piece (32) matched with screens piece (11), joint piece (32) and screens piece (11) joint, joint piece (32) and screens piece (11) can be followed the axis direction of throw-out collar (3) under the joint state and realized the relative movement of certain distance, joint piece (32) can not produce the influence to the relative position of throw-out collar (3), sealing ring (6) and rotating ring subassembly (4) at the relative movement in-process with screens piece (11).

5. A spring type mechanical seal according to claim 4, characterized in that joint spare (32) is "T" type structure, joint spare (32) including towards joint end (321) of screens piece (11) and with joint end (321) vertically draft arm (322), screens piece (11) are including rectangle recess (111) and two limiting plates (112) that are used for placing joint end (321), limiting plate (112) set up perpendicularly relatively in the opening part of rectangle recess (111), form between two limiting plates (112) and be less than joint end (321) width and be greater than removal opening (113) of draft arm (322) width, the degree of depth and the length looks adaptation of draft arm (322) of rectangle recess (111).

6. A spring type mechanical seal according to claim 5, characterized in that a connection inlet is arranged at one side of the rectangular groove (111), and the clamping end (321) enters the rectangular groove (111) along the connection inlet.