Double-end-face mechanical seal

Abstract

The utility model provides a double-end-face mechanical seal, which belongs to the technical field of mechanical seals and comprises a shaft sleeve provided with a first moving ring and a second moving ring. The shaft sleeve is sleeved with the sealing disc, the sealing disc is provided with a first static ring, a second static ring and a plurality of springs, and the two ends of each spring are connected with the first static ring and the second static ring in an abutting mode and apply sealing pressure to the first static ring and the second static ring; the first moving ring and the first static ring are located in a first area, each spring is located in a middle area, and the second moving ring and the second static ring are located in a second area; first auxiliary sealing rings are arranged between the first movable ring and the shaft sleeve as well as between the first static ring and the sealing disc; the utility model has the beneficial effects that the sealing surface formed by the first moving ring and the first static ring is matched with the two first auxiliary sealing rings to separate the path from the medium side to the middle area, so that the medium cannot be in contact with the spring, the spring cannot lose efficacy due to blockage, and the sealing reliability is ensured.

Description

Technical Field

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

[0002] A mechanical seal is a device used to prevent the leakage of fluids or gases. It is primarily used in rotating equipment such as pumps, compressors, and agitators. A mechanical seal consists of two main components: a stationary ring (mounted on the equipment housing) and a rotating ring (rotating with the shaft). These two rings come into close contact and form a sealing surface. A double-end mechanical seal has two sets of stationary rings and two sets of rotating rings.

[0003] In existing double-end mechanical seals, the dynamic and static rings rely on spring-generated sealing pressure to maintain a tight fit. However, due to structural design, the medium may come into contact with the spring, causing it to clog and lose its elasticity, thus posing the risk of seal failure. Utility Model Content

[0004] The purpose of the utility model is to address the above-mentioned problems in the prior art and to propose a double-end mechanical seal.

[0005] The purpose of the utility model can be achieved through the following technical solutions: A double-end mechanical seal, comprising:

[0006] A shaft sleeve, wherein a first movable ring and a second movable ring are mounted on the shaft sleeve, and the first movable ring and the second movable ring are both circumferentially fixedly connected to the shaft sleeve;

[0007] a sealing disc, the sealing disc being sleeved on the shaft sleeve and being equipped with a first static ring, a second static ring, and a plurality of springs. The first static ring is in close contact with the first dynamic ring and the second static ring is in close contact with the second dynamic ring. The springs are arranged around the shaft sleeve, and the ends of the springs are respectively in contact with the first static ring and the second static ring and apply sealing pressure to both.

[0008] An annular cavity is formed between the sleeve and the sealing disk, and the annular cavity is divided into a first area, a middle area and a second area along its axial direction. The first dynamic ring and the first static ring are in the first area, each of the springs is in the middle area, and the second dynamic ring and the second static ring are in the second area; the first area is set to correspond to the medium side, and a first auxiliary sealing ring is provided between the first dynamic ring and the sleeve and between the first static ring and the sealing disk. The sealing surface formed by the first dynamic ring and the first static ring cooperates with the two first auxiliary sealing rings to block the path from the medium side to the middle area.

[0009] Preferably, the first movable ring and the second movable ring are both circumferentially fixedly connected to the shaft sleeve via corresponding transmission pins.

[0010] Preferably, both ends of the middle area are respectively connected to a portion of the first area and a portion of the second area, and the sealing disk is provided with a water inlet and a water outlet, and both the water inlet and the water outlet are connected to the middle area.

[0011] Preferably, a second auxiliary sealing ring is provided between the second static ring and the sealing disk and between the second dynamic ring and the shaft sleeve. The sealing surface formed by the second dynamic ring and the second static ring cooperates with the two second auxiliary sealing rings to block the path from the middle area to the atmosphere side.

[0012] Preferably, it further comprises a positioning block and a positioning screw, wherein the positioning block is positioned and connected to the shaft sleeve via the positioning screw, and the positioning block is fixedly connected to the sealing disk to locate the relative positions of the sealing disk and the shaft sleeve.

[0013] Preferably, a fastening ring is sleeved on the shaft sleeve, and the fastening ring is provided with a set screw for connecting with the rotating shaft, and the set screw passes through the shaft sleeve.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The sealing surface formed by the first dynamic ring and the first static ring cooperates with the two first auxiliary sealing rings to block the path from the medium side to the middle area, so the medium cannot contact the spring, so the spring will not fail due to blockage, ensuring the reliability of the seal.

[0016] 2. In order to ensure that the first moving ring and the second moving ring can stably rotate synchronously with the shaft sleeve, both are fixedly connected to the shaft sleeve in the circumferential direction through their own transmission pins.

[0017] 3. Secondary auxiliary seals are installed between the second stationary ring and the sealing disc, and between the second dynamic ring and the shaft sleeve. This design effectively blocks the path from the intermediate area to the atmosphere, preventing impurities from the external environment from entering the sealed area. It also prevents coolant or cleaning fluid from leaking to the atmosphere during cleaning. Furthermore, since the path from the intermediate area to the medium is cut off, coolant or cleaning fluid is prevented from leaking to the medium during cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the double-end mechanical seal of the present invention.

[0019] Figure 2 It is a schematic diagram of the partial structure of the double-end mechanical seal of the present invention.

[0020] In the figure, 100, sleeve; 110, first dynamic ring; 120, second dynamic ring; 130, set screw; 200, sealing disk; 210, first static ring; 220, second static ring; 230, spring; 240, water inlet; 250, water outlet; 300, first area; 310, first auxiliary sealing ring; 400, middle area; 500, second area; 510, second auxiliary sealing ring; 600, positioning block; 610, positioning screw; 700, fastening ring. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1-2 As shown, a double-end mechanical seal includes: a sleeve 100, on which a first dynamic ring 110 and a second dynamic ring 120 are mounted, and the first dynamic ring 110 and the second dynamic ring 120 are both circumferentially fixedly connected to the sleeve 100; a sealing disk 200, which is sleeved on the sleeve 100 and is equipped with a first static ring 210, a second static ring 220 and a plurality of springs 230, the first static ring 210 is sealed in contact with the first dynamic ring 110, and the second static ring 220 is sealed in contact with the second dynamic ring 120, and each spring 230 is arranged around the sleeve 100, and both ends of the spring 230 are respectively in contact with the first static ring 210 and the second static ring 220 and apply sealing pressure to the two; the sleeve 10 0 and the sealing disk 200. An annular cavity is formed between the annular cavity and is divided into a first area 300, an intermediate area 400 and a second area 500 along its axial direction. The first movable ring 110 and the first static ring 210 are in the first area 300, each spring 230 is in the intermediate area 400, and the second movable ring 120 and the second static ring 220 are in the second area 500; the first area 300 is set to correspond to the medium side, and a first auxiliary sealing ring 310 is provided between the first movable ring 110 and the sleeve 100 and between the first static ring 210 and the sealing disk 200. The sealing surface formed by the first movable ring 110 and the first static ring 210 cooperates with the two first auxiliary sealing rings 310 to block the path from the medium side to the intermediate area 400.

[0023] The sleeve 100 is sleeved on the rotating shaft and can rotate together with the rotating shaft. The first movable ring 110 and the second movable ring 120 rotate together with the sleeve 100 to ensure that the first movable ring 110 and the second movable ring 120 can rotate synchronously with the rotating shaft during the operation of the equipment; the sealing disk 200 is sleeved on the sleeve 100, and the sealing disk 200 is used to be fixedly connected to the housing of the equipment. The sealing disk 200 remains stationary relative to the rotating shaft. The first static ring 210 and the second static ring 220 are tightly fitted with the first dynamic ring 110 and the second dynamic ring 120 respectively under the action of the sealing pressure provided by the spring 230, thereby forming a sealing surface between the sleeve 100 and the sealing disk 200.

[0024] In this design, an annular cavity is formed between the sleeve 100 and the sealing disk 200. This annular cavity is divided into three regions along the axial direction: a first region 300, a middle region 400, and a second region 500. The first dynamic ring 110 and the first stationary ring 210 are located in the first region 300, the spring 230 is located in the middle region 400, and the second dynamic ring 120 and the second stationary ring 220 are located in the second region 500. The first region 300 corresponds to the medium side.

[0025] Among them, the first auxiliary sealing ring 310 between the first dynamic ring 110 and the sleeve 100 is used to seal the gap between the first dynamic ring 110 and the sleeve 100 (that is, the medium cannot enter the middle area 400 from the gap), and the first auxiliary sealing ring 310 between the first static ring 210 and the sealing disk 200 is used to seal the gap between the first static ring 210 and the sealing disk 200 (that is, the medium cannot enter the middle area 400 from the gap). The sealing surface formed by the first static ring 210 and the first dynamic ring 110 is used to seal the gap between the sleeve 100 and the sealing disk 200 in the first area 300 (that is, the medium cannot enter the middle area 400 from the gap). Through the above design, the path from the medium side to the middle area 400 is completely blocked, so the medium on the medium side cannot enter the middle area 400, thereby protecting the spring 230 from contamination.

[0026] Based on the above embodiment, the first movable ring 110 and the second movable ring 120 are both circumferentially fixedly connected to the sleeve 100 via corresponding transmission pins. To ensure that the first movable ring 110 and the second movable ring 120 can stably rotate synchronously with the sleeve 100, both are circumferentially fixedly connected to the sleeve 100 via their respective transmission pins.

[0027] Based on the above embodiment, the two ends of the middle area 400 are respectively connected to part of the first area 300 and part of the second area 500, and the sealing disk 200 is provided with a water inlet 240 and a water outlet 250, and the water inlet 240 and the water outlet 250 are both connected to the middle area 400.

[0028] When in use, this mechanical seal requires cooling water to circulate within the seal through the water inlet 240 and the water outlet 250. The ends of the intermediate region 400 communicate with a portion of the first region 300 and a portion of the second region 500, respectively. Furthermore, the sealing disk 200 is provided with a water inlet 240 and a water outlet 250, both of which communicate with the intermediate region 400. This design allows for the introduction of coolant or cleaning fluid through the intermediate region 400, allowing it to enter both the first region 300 and the second region 500, helping to cool and clean both sealing surfaces and extending the service life of the seal.

[0029] On the basis of the above embodiment, a second auxiliary sealing ring 510 is provided between the second static ring 220 and the sealing disk 200, and between the second dynamic ring 120 and the shaft sleeve 100. The sealing surface formed by the second dynamic ring 120 and the second static ring 220 cooperates with the two second auxiliary sealing rings 510 to block the path from the middle area 400 to the atmosphere side.

[0030] To further enhance sealing performance, a second auxiliary seal ring 510 is installed between the second stationary ring 220 and the sealing disk 200, and between the second dynamic ring 120 and the shaft sleeve 100. This design effectively blocks the path from the intermediate region 400 to the atmosphere, preventing impurities from the external environment from entering the sealed area. It also prevents coolant or cleaning fluid from leaking to the atmosphere during cleaning. Furthermore, since the path from the intermediate region 400 to the medium is blocked, coolant or cleaning fluid is prevented from leaking to the medium during cleaning.

[0031] On the basis of the above embodiment, it further includes a positioning block 600 and a positioning screw 610. The positioning block 600 is positioned and connected to the sleeve 100 through the positioning screw 610. The positioning block 600 is fixedly connected to the sealing disk 200 to locate the relative position of the sealing disk 200 and the sleeve 100.

[0032] To ensure the accurate positioning of the sealing disc 200 relative to the shaft sleeve 100, this embodiment also includes a positioning block 600 and a positioning screw 610. The positioning block 600 is secured to the shaft sleeve 100 via the positioning screw 610. The positioning block 600 is also connected to the sealing disc 200, thereby achieving precise positioning of the sealing disc 200 relative to the shaft sleeve 100. This structure simplifies the installation process and ensures the accuracy of the mechanical seal.

[0033] Based on the above embodiment, a fastening ring 700 is mounted on the sleeve 100. The fastening ring 700 is provided with a set screw 130 for connecting to the rotating shaft. The set screw 130 passes through the sleeve 100. The fastening ring 700 is actually a ring-shaped structure mounted on the sleeve 100. The sleeve 100 is circumferentially fixed to the rotating shaft by the set screw 130 on the fastening ring 700. In the actual structure, the second dynamic ring 120 is mounted on the fastening ring 700.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 double-end mechanical seal, characterized in that: include: A shaft sleeve (100), wherein a first movable ring (110) and a second movable ring (120) are mounted on the shaft sleeve (100), and the first movable ring (110) and the second movable ring (120) are both circumferentially fixedly connected to the shaft sleeve (100); A sealing disk (200), wherein the sealing disk (200) is sleeved on the shaft sleeve (100), and the sealing disk (200) is equipped with a first static ring (210), a second static ring (220) and a plurality of springs (230), wherein the first static ring (210) is fitted and sealed with the first dynamic ring (110), and the second static ring (220) is fitted and sealed with the second dynamic ring (120), and each of the springs (230) is arranged around the shaft sleeve (100), and the two ends of the spring (230) are respectively in contact with the first static ring (210) and the second static ring (220) and apply sealing pressure to both; An annular cavity is formed between the shaft sleeve (100) and the sealing disk (200), and the annular cavity is divided into a first area (300), an intermediate area (400) and a second area (500) along its axial direction. The first dynamic ring (110) and the first static ring (210) are located in the first area (300), each of the springs (230) is located in the intermediate area (400), and the second dynamic ring (120) and the second static ring (220) are located in the second area (500). The first area (300) is configured to correspond to the medium side. A first auxiliary sealing ring (310) is provided between the first dynamic ring (110) and the shaft sleeve (100) and between the first static ring (210) and the sealing disk (200). The sealing surface formed by the first dynamic ring (110) and the first static ring (210) cooperates with the two first auxiliary sealing rings (310) to block the path from the medium side to the intermediate area (400).

2. A double-end mechanical seal according to claim 1, characterized in that: The first moving ring (110) and the second moving ring (120) are both circumferentially fixedly connected to the shaft sleeve (100) via corresponding transmission pins.

3. A double-end mechanical seal according to claim 1, characterized in that: The two ends of the middle area (400) are respectively connected to a portion of the first area (300) and a portion of the second area (500); the sealing disk (200) is provided with a water inlet (240) and a water outlet (250); and both the water inlet (240) and the water outlet (250) are connected to the middle area (400).

4. A double-end mechanical seal according to claim 3, characterized in that: A second auxiliary sealing ring (510) is provided between the second static ring (220) and the sealing disk (200), and between the second dynamic ring (120) and the shaft sleeve (100). The sealing surface formed by the second dynamic ring (120) and the second static ring (220) cooperates with the two second auxiliary sealing rings (510) to block the path from the middle area (400) to the atmosphere side.

5. A double-end mechanical seal according to claim 1, characterized in that: The invention also includes a positioning block (600) and a positioning screw (610), wherein the positioning block (600) is positioned and connected to the shaft sleeve (100) via the positioning screw (610), and the positioning block (600) is fixedly connected to the sealing disk (200) to locate the relative position of the sealing disk (200) and the shaft sleeve (100).

6. A double-end mechanical seal according to claim 1, characterized in that: A fastening ring (700) is sleeved on the shaft sleeve (100), and the fastening ring (700) is provided with a set screw (130) for connecting with the rotating shaft, and the set screw (130) passes through the shaft sleeve (100).

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