Small-shaft-diameter single-end-face packaging type mechanical seal

Abstract

The utility model provides a small-shaft-diameter single-end-face packaging type mechanical seal, which belongs to the technical field of mechanical seals and comprises a shaft sleeve, a positioning hole is formed in the wall of the shaft sleeve, a movable ring is mounted on the shaft sleeve, and the movable ring is fixedly connected with the shaft sleeve in the circumferential direction. The static ring seat is arranged on the shaft sleeve in a sleeving mode, a static ring is installed on the static ring seat, the shaft sleeve is sleeved with the static ring, and the movable ring and the static ring are sealed in an attached mode; the shaft sleeve is sleeved with the fastening ring, the fastening ring and the shaft sleeve are welded, the fastening ring is provided with a detachable set screw, and the set screw penetrates into the positioning hole; the mechanical seal has the advantages that the shaft sleeve and the fastening ring which are assembled are welded together, and the water leakage phenomenon caused by reduction of precision due to manual disassembly and assembly is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical seals and relates to a small-diameter single-end-face cartridge-type mechanical seal. Background Art

[0002] The cartridge mechanical seal is an advanced sealing technology that pre-assembles the main components of the mechanical seal (such as the dynamic ring, static ring, spring, auxiliary seal ring, sleeve, static ring seat, etc.) into a complete unit. This complete unit is assembled, pre-adjusted, and tested at the manufacturer to ensure that it meets design requirements and quality standards. When it is necessary to install it on site, this pre-assembled component can be directly installed on the equipment, eliminating the need for complex on-site assembly and adjustment.

[0003] In the specific structure of a cartridge mechanical seal, a clamping ring is placed on a shaft sleeve. The clamping ring is equipped with a set screw that passes through the shaft sleeve to connect the clamping ring and the shaft sleeve. During the installation process of the cartridge mechanical seal in the equipment, the set screw must be unscrewed, the shaft sleeve is installed on the rotating shaft, and the set screw is then passed through the shaft sleeve and pressed against the surface of the rotating shaft. Because this process involves manual labor, it can lead to reduced installation accuracy of the mechanical seal and, in extreme cases, even water leakage. Therefore, there is still room for improvement in this area. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems in the prior art and to propose a small-diameter single-end-face cartridge mechanical seal.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a small-diameter single-end-face cartridge mechanical seal, comprising:

[0006] A shaft sleeve, wherein a positioning hole is formed on the wall of the shaft sleeve, and a dynamic ring is mounted on the shaft sleeve, and the dynamic ring is fixedly connected to the shaft sleeve in a circumferential direction;

[0007] A stationary ring seat, the stationary ring seat is sleeved on the shaft sleeve, the stationary ring is installed on the stationary ring seat, the stationary ring is sleeved on the shaft sleeve, and the dynamic ring is sealed against the stationary ring;

[0008] A fastening ring is sleeved on the shaft sleeve and welded to the shaft sleeve. A detachable set screw is installed on the fastening ring, and the set screw is inserted into the positioning hole.

[0009] Preferably, a welding layer is provided between the outer circumference of the shaft sleeve and the inner circumference of the fastening ring, and the shaft sleeve and the fastening ring are welded via the welding layer.

[0010] Preferably, the stationary ring seat and the fastening ring are adjacently arranged in the axial direction of the sleeve, a first washer is provided on the side of the stationary ring seat facing the fastening ring, and a gap is reserved between the fastening ring and the first washer in the axial direction of the sleeve.

[0011] Preferably, it also includes an insert, which has a notch portion that is adapted to the contour shape of the outer circumferential surface of the sleeve. The insert is configured to be detachably inserted into the sleeve through the notch portion and located in the gap between the fastening ring and the first washer. The size of the gap between the fastening ring and the first washer is determined by the thickness of the insert.

[0012] Preferably, the stationary ring seat has a flange portion, and the flange portion is provided with at least two bolt holes.

[0013] Preferably, one end of the sleeve has a positioning boss, and the sleeve is also provided with a second washer and a rubber bellows, the second washer is in contact with the positioning boss, one end of the rubber bellows is in contact with the second washer, the dynamic ring is connected to the other end of the rubber bellows and the two are sealed and fitted together, a spring is provided on the rubber bellows, both ends of the spring are respectively in contact with both ends of the rubber bellows and apply elastic force to the rubber bellows to stretch it, and under the action of the spring, the rubber bellows applies sealing pressure to the dynamic ring toward the static ring.

[0014] Preferably, auxiliary sealing rings are provided on the inner circumferential surface of the shaft sleeve, between the stationary ring seat and the stationary ring, and on the outer circumferential surface of the stationary ring seat.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This mechanical seal welds the assembled sleeve and the fastening ring together to avoid water leakage caused by disassembly and assembly due to human factors, which may lead to a decrease in accuracy.

[0017] 2. Before starting the installation, you need to prepare an insert of appropriate thickness. The thickness of the insert should be selected according to the required gap size to ensure that the final sealing effect meets the requirements. During the installation process, insert the insert into the outer circumference of the sleeve according to the shape of its notch. At this time, the insert is located between the fastening ring and the first gasket on the outside of the static ring seat, which serves to separate the two parts. After all components are correctly installed and confirmed, the insert can be pulled out of the sleeve. Removal of the insert means that the predetermined gap between the fastening ring and the first gasket is achieved without the need for additional adjustments. The gap setting can be completed by simply inserting and pulling out the insert, which greatly simplifies the installation process and reduces problems caused by installation errors.

[0018] 3. The second gasket is pressed against the locating boss so that it cannot move in the axial direction of the sleeve. The rubber bellows has a tendency to stretch under the action of the spring. The dynamic ring is installed at the other end of the rubber bellows, so the rubber bellows can apply sealing pressure to the dynamic ring. This sealing pressure can make the dynamic ring fit tightly with the static ring and also compensate for the wear of the dynamic ring and the static ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the container-type mechanical seal of the present invention.

[0020] Figure 2 for Figure 1 A magnified schematic diagram of part A.

[0021] Figure 3 This is a schematic structural diagram of the insert of the present utility model.

[0022] In the figure, 100, sleeve; 110, positioning hole; 120, positioning boss; 130, second gasket; 140, rubber bellows; 141, spring; 200, dynamic ring; 300, stationary ring seat; 310, first gasket; 320, flange; 330, bolt hole; 400, stationary ring; 500, fastening ring; 510, set screw; 600, welding layer; 700, insert; 710, notch. DETAILED DESCRIPTION

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] like Figure 1-2 As shown, a small-diameter single-end face cartridge mechanical seal includes: a sleeve 100, a positioning hole 110 is opened on the wall of the sleeve 100, a dynamic ring 200 is installed on the sleeve 100, and the dynamic ring 200 is fixedly connected to the sleeve 100 in the circumferential direction; a stationary ring seat 300, the stationary ring seat 300 is sleeved on the sleeve 100, the stationary ring 400 is installed on the stationary ring seat 300, the stationary ring 400 is sleeved on the sleeve 100, and the dynamic ring 200 and the stationary ring 400 are fit and sealed; a fastening ring 500, the fastening ring 500 is sleeved on the sleeve 100, and the fastening ring 500 is welded to the sleeve 100, and the fastening ring 500 is installed with a detachable set screw 510, and the set screw 510 is inserted into the positioning hole 110.

[0025] Specifically, a positioning hole 110 is provided on the wall of the sleeve 100, and the positioning screw of the fastening ring 500 can pass through the positioning hole 110 to fix the fastening ring 500 to the sleeve 100. A dynamic ring 200 is installed on the sleeve 100, and the dynamic ring 200 and the sleeve 100 are circumferentially fixedly connected, which means that the dynamic ring 200 is fixed relative to the sleeve 100 and will not move with the rotation of the shaft. The static ring seat 300 is sleeved on the sleeve 100, and the static ring seat 300 itself is installed with a static ring 400. The static ring 400 is also sleeved on the sleeve 100, so that when the dynamic ring 200 and the static ring 400 are fitted together, a sealing surface is formed between them, and the medium cannot leak from the sealing surface between the dynamic ring 200 and the static ring 400. The fastening ring 500 is sleeved on the shaft sleeve 100 and welded to the shaft sleeve 100. A detachable set screw 510 is installed on the fastening ring 500. The set screw 510 passes through the positioning hole 110 of the shaft sleeve 100 to ensure that the position of the fastening ring 500 is fixed.

[0026] During the pre-assembly process, the fastening ring 500 can be placed on the shaft sleeve 100, ensuring that the fastening ring 500 is in the set position. The set screw 510 is then screwed in. The set screw 510 passes through the positioning hole 110 to temporarily fix the fastening ring 500 and the shaft sleeve 100 together. The fastening ring 500 and the shaft sleeve 100 are then fixed together by welding. In this way, even after the set screw 510 is removed, the fastening ring 500 and the shaft sleeve 100 remain together. This design effectively avoids the problem of reduced accuracy caused by human factors during the disassembly and assembly process, thereby reducing the risk of water leakage.

[0027] On the basis of the above embodiment, a welding layer 600 is provided between the outer circumference of the sleeve 100 and the inner circumference of the fastening ring 500 , and the sleeve 100 and the fastening ring 500 are welded via the welding layer 600 .

[0028] Welding layer 600 is the metal connection layer formed by welding between sleeve 100 and fastening ring 500. This welding process greatly improves the connection strength between sleeve 100 and fastening ring 500. After welding, sleeve 100 and fastening ring 500 become one, enhancing the structural rigidity and stability of the entire mechanical seal.

[0029] like Figure 1-3 As shown, based on the above embodiment, the stationary ring seat 300 and the fastening ring 500 are adjacent to each other in the axial direction of the sleeve 100, and a first washer 310 is provided on the side of the stationary ring seat 300 facing the fastening ring 500, and a gap is reserved between the fastening ring 500 and the first washer 310 in the axial direction of the sleeve 100.

[0030] When the mechanical seal is working, the stationary ring seat 300 remains stationary, the sleeve 100 and the fastening ring 500 on the sleeve 100 rotate together with the rotating shaft, and a gap is reserved between the two, which can effectively prevent the rotating fastening ring 500 from contacting the stationary ring seat 300, thereby avoiding motion interference.

[0031] On the basis of the above embodiment, it also includes an insert 700, which has a notch portion 710 that is adapted to the contour shape of the outer circumferential surface of the sleeve 100. The insert 700 is configured to be detachably inserted into the sleeve 100 through the notch portion 710 and is located in the gap between the fastening ring 500 and the first washer 310. The size of the gap between the fastening ring 500 and the first washer 310 is determined by the thickness of the insert 700.

[0032] In this embodiment, the design of the positioning block is eliminated, and an insert 700 is used to assist in the installation of the mechanical seal. Before starting the installation, an insert 700 of appropriate thickness needs to be prepared. The thickness of the insert 700 should be selected according to the required gap size to ensure that the final sealing effect meets the requirements. During the installation process, the insert 700 is inserted into the outer peripheral surface of the sleeve 100 according to the shape of its notch 710. At this time, the insert 700 is located between the fastening ring 500 and the first gasket 310 on the outside of the static ring seat 300, which serves to separate the two parts. After all components are correctly installed and confirmed to be correct, the insert 700 can be pulled out of the sleeve 100. The removal of the insert 700 means that the predetermined gap between the fastening ring 500 and the first gasket 310 is achieved without the need for additional adjustments. The gap setting can be completed by simply inserting and pulling out the insert 700, which greatly simplifies the installation process and reduces problems caused by installation errors.

[0033] like Figure 1 As shown, based on the above embodiment, the stationary ring seat 300 has a flange portion 320, which is provided with at least two bolt holes 330. The stationary ring seat 300 is fixedly connected to the housing of the device via the flange portion 320. During installation, the flange portion 320 is fitted against the device housing, and then bolts are passed through the bolt holes 330 to connect the stationary ring seat 300 to the device housing, thereby completing the installation of the stationary ring seat 300.

[0034] like Figure 1As shown, on the basis of the above embodiment, one end of the sleeve 100 has a positioning boss 120, and the sleeve 100 is also provided with a second gasket 130 and a rubber bellows 140, the second gasket 130 is in contact with the positioning boss 120, one end of the rubber bellows 140 is in contact with the second gasket 130, the dynamic ring 200 is connected to the other end of the rubber bellows 140 and the two are sealed and fitted together, a spring 141 is provided on the rubber bellows 140, both ends of the spring 141 are respectively in contact with both ends of the rubber bellows 140 and apply elastic force to the rubber bellows 140 to stretch it, and under the action of the spring 141, the rubber bellows 140 applies sealing pressure to the dynamic ring 200 toward the static ring 400.

[0035] The main function of the positioning boss 120 is to ensure the axial position of the second gasket 130 on the sleeve 100. The positioning boss 120 presses against the second gasket 130 to prevent it from moving axially in the sleeve 100. The rubber bellows 140 has a tendency to stretch under the action of the spring 141. The dynamic ring 200 is mounted on the other end of the rubber bellows 140. Therefore, the rubber bellows 140 can apply sealing pressure to the dynamic ring 200. This sealing pressure can ensure a tight fit between the dynamic ring 200 and the static ring 400 and can also compensate for the wear of the dynamic ring 200 and the static ring 400. The rubber bellows 140 and the dynamic ring 200, as well as the rubber bellows 140 and the sleeve 100, are also sealed.

[0036] On the basis of the above embodiment, auxiliary sealing rings are provided on the inner circumference of the sleeve 100 , between the stationary ring seat 300 and the stationary ring 400 , and on the outer circumference of the stationary ring seat 300 .

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

Claims

1. A small diameter single end face cartridge mechanical seal, characterized in that: include: A shaft sleeve (100), wherein a positioning hole (110) is provided on a wall portion of the shaft sleeve (100), a dynamic ring (200) is mounted on the shaft sleeve (100), and the dynamic ring (200) is circumferentially fixedly connected to the shaft sleeve (100); A stationary ring seat (300), wherein the stationary ring seat (300) is sleeved on the shaft sleeve (100), a stationary ring (400) is installed on the stationary ring seat (300), and the stationary ring (400) is sleeved on the shaft sleeve (100), and the dynamic ring (200) and the stationary ring (400) are fitted and sealed; A fastening ring (500) is sleeved on the shaft sleeve (100), and the fastening ring (500) is welded to the shaft sleeve (100). The fastening ring (500) is equipped with a detachable set screw (510), and the set screw (510) is inserted into the positioning hole (110).

2. A small-diameter single-end cartridge mechanical seal according to claim 1, characterized in that: A welding layer (600) is provided between the outer circumferential surface of the shaft sleeve (100) and the inner circumferential surface of the fastening ring (500), and the shaft sleeve (100) and the fastening ring (500) are welded via the welding layer (600).

3. A small-diameter single-end cartridge mechanical seal according to claim 1, characterized in that: The stationary ring seat (300) and the fastening ring (500) are arranged adjacent to each other in the axial direction of the shaft sleeve (100); a first washer (310) is provided on the side of the stationary ring seat (300) facing the fastening ring (500); and a gap is reserved between the fastening ring (500) and the first washer (310) in the axial direction of the shaft sleeve (100).

4. A small-diameter single-end cartridge mechanical seal according to claim 3, characterized in that: The invention also includes an insert (700), wherein the insert (700) has a notch portion (710) adapted to the outer peripheral contour of the sleeve (100), and the insert (700) is configured to be detachably inserted into the sleeve (100) through the notch portion (710) and located in the gap between the fastening ring (500) and the first washer (310), and the size of the gap between the fastening ring (500) and the first washer (310) is determined by the thickness of the insert (700).

5. A small-diameter single-end cartridge mechanical seal according to claim 1 or 3, characterized in that: The stationary ring seat (300) has a flange portion (320), and the flange portion (320) is provided with at least two bolt holes (330).

6. A small-diameter single-end cartridge mechanical seal according to claim 1, characterized in that: One end of the sleeve (100) has a positioning boss (120), and the sleeve (100) is also provided with a second gasket (130) and a rubber bellows (140), the second gasket (130) is in contact with the positioning boss (120), one end of the rubber bellows (140) is in contact with the second gasket (130), the dynamic ring (200) is connected to the other end of the rubber bellows (140) and the two are sealed and fitted together, a spring (141) is provided on the rubber bellows (140), the two ends of the spring (141) are respectively in contact with the two ends of the rubber bellows (140) and apply elastic force to the rubber bellows (140) to stretch it, and the rubber bellows (140) applies sealing pressure to the dynamic ring (200) toward the static ring (400) under the action of the spring (141).

7. The small-diameter single-end cartridge mechanical seal according to claim 1, characterized in that: Auxiliary sealing rings are provided on the inner circumference of the shaft sleeve (100), between the stationary ring seat (300) and the stationary ring (400), and on the outer circumference of the stationary ring seat (300).

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