A cartridge mechanical seal with a skeleton oil seal

Abstract

This utility model provides a cartridge mechanical seal with a skeleton oil seal, belonging to the field of mechanical seal technology. It includes: a shaft sleeve with a rotating ring fitted on it; a sealing disc fitted on the shaft sleeve, with a pre-reserved gap cavity between the sealing disc and the shaft sleeve, and a stationary ring on the sealing disc, the stationary ring and the rotating ring sealingly adhering to and sealing one end of the gap cavity from the outside; and a skeleton oil seal, which seals between the shaft sleeve and the sealing disc and seals the other end of the gap cavity from the outside. The sealing disc has a cleaning channel, one end of which is located on the outer circumferential surface of the sealing disc, and the other end of which communicates with the gap cavity. The advantages of this utility model are: in a double-end mechanical seal, the sealing structure at one end is a rotating ring and a stationary ring, while the sealing structure at the other end is replaced by a skeleton oil seal, which effectively reduces the axial length of the mechanical seal, meeting not only the installation requirements of narrow spaces but also the requirements for cleaning and cooling.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical seal technology and relates to a cartridge mechanical seal with a skeleton oil seal. Background Technology

[0002] Mechanical seals are widely used in equipment such as pumps, compressors, and mixing machinery. Their function is to isolate the leakage path between rotating parts (such as shafts) and stationary structural cavities, preventing harmful media within the cavity from leaking to the outside. Mechanical seals typically consist of a moving component fixed to the shaft and a stationary component fixed to the cavity.

[0003] Spring mechanical seals are a commonly used mechanical seal structure, generally including a rotating ring, a sealing ring, a pressure element (spring), and metal structural components. The rotating ring and the stationary ring are a pair of highly flat friction pairs. Under the positive pressure applied by the spring, the rotating ring and the stationary ring fit tightly together to form a sealing surface. The gap between the rotating and stationary rings when they rotate relative to each other is on the order of micrometers, which can effectively prevent internal fluid from leaking from the sealing surface.

[0004] Generally, double-end mechanical seals have a dynamic ring and a stationary ring at both ends. Therefore, double-end mechanical seals have a relatively long axial length, making them unsuitable for installation in narrow pump chambers. If the dynamic and stationary rings on one side are removed to reduce size, the sealing structure will be incomplete, preventing effective flushing and cooling. The cooling and cleaning medium will leak from the side without a sealing face, making it difficult to meet the sealing and cooling requirements for normal operation. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a cartridge mechanical seal with a skeleton oil seal.

[0006] The objective of this utility model can be achieved through the following technical solution: a cartridge mechanical seal with a skeleton oil seal, comprising:

[0007] A bushing, on which a rotating ring is fitted;

[0008] A sealing disc is fitted onto the bushing, and a gap cavity is reserved between the sealing disc and the bushing. The sealing disc is provided with a stationary ring, which is located at one end of the gap cavity. The stationary ring and the moving ring are sealed together to block the communication path between one end of the gap cavity and the outside.

[0009] A skeleton oil seal is located at the other end of the gap cavity. The skeleton oil seal seals between the bushing and the sealing disc and blocks the communication path between the other end of the gap cavity and the outside.

[0010] The sealing disc is provided with a cleaning channel, one end of which is located on the outer peripheral surface of the sealing disc, and the other end of which is connected to the gap cavity.

[0011] Preferably, the stationary ring is located at the end of the gap cavity near the medium side, and the stationary ring is attached to the moving ring and seals the communication path between the gap cavity and the medium side; the skeleton oil seal is located at the end of the gap cavity near the atmosphere side, and the skeleton oil seal seals the communication path between the gap cavity and the atmosphere side.

[0012] Preferably, the gap cavity includes a rotating ring mounting chamber, a liquid inlet chamber, and an oil seal mounting chamber arranged sequentially along its axial direction. The two ends of the liquid inlet chamber are respectively connected to the rotating ring mounting chamber and the oil seal mounting chamber. The rotating ring is mounted in the rotating ring mounting chamber, the skeleton oil seal is mounted in the oil seal mounting chamber, and the cleaning channel is connected to the liquid inlet chamber.

[0013] Preferably, the gap cavity is provided with an elastic element, one end of which is in contact with the stationary ring and the other end of which is in contact with the sealing disc. The elastic element applies a spring force to the stationary ring to make it tend toward the moving ring.

[0014] Preferably, the gap cavity is provided with a washer, the washer abutting against the stationary ring, and one end of the elastic member abutting against the washer.

[0015] Preferably, the sealing disc is provided with a stop pin, and the stationary ring is circumferentially locked to the sealing disc by the stop pin; the bushing is provided with a drive pin, and the moving ring is circumferentially locked to the bushing by the drive pin.

[0016] Preferably, sealing rings are provided between the bushing and the rotating ring, and between the sealing disc and the stationary ring.

[0017] Preferably, the sealing disc is further provided with a drainage channel, one end of which is located on the outer peripheral surface of the sealing disc, and the other end of which is connected to the gap cavity.

[0018] Preferably, a fastening ring is fitted on the bushing, and a set screw is provided on the fastening ring, the set screw passing through the bushing.

[0019] Preferably, the fastening ring is provided with a positioning block, the sealing disc is connected to the positioning block, and the sealing disc is axially locked to the positioning block.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. In a double-end mechanical seal, the sealing structure at one end is a dynamic ring and a stationary ring, while the sealing structure at the other end is replaced by a skeleton oil seal. This can effectively reduce the axial length of the mechanical seal, which can not only meet the installation requirements in narrow spaces, but also meet the cleaning and cooling requirements.

[0022] 2. Since the dynamic ring mounting cavity and the oil seal mounting cavity are located at both ends of the liquid inlet chamber, after installing the dynamic ring and the skeleton oil seal, both ends of the liquid inlet chamber can be effectively sealed, preventing the cleaning fluid from leaking to the outside. At the same time, the sealing surface formed by the dynamic ring and the stationary ring is cooled and cleaned.

[0023] 3. The washer is placed between the elastic element and the stationary ring to transmit and distribute force. It prevents the end of the spring from directly scraping the stationary ring, and at the same time makes the stationary ring more evenly stressed, preventing it from tilting due to uneven stress. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the cartridge mechanical seal of this utility model.

[0025] Figure 2 This is a schematic diagram of the gap cavity structure of this utility model.

[0026] In the diagram, 100 is the bushing; 110 is the rotating ring; 120 is the drive pin; 130 is the fastening ring; 140 is the positioning block; 200 is the sealing disc; 210 is the stationary ring; 220 is the cleaning channel; 230 is the drain channel; 240 is the stop pin; 300 is the skeleton oil seal; 400 is the gap cavity; 410 is the rotating ring mounting chamber; 420 is the liquid inlet chamber; 430 is the oil seal mounting chamber; 500 is the elastic element; 600 is the washer; and 700 is the sealing ring. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] like Figure 1 , Figure 2 As shown, a cartridge mechanical seal with a skeleton oil seal includes:

[0029] A bushing 100 is provided, and a rotating ring 110 is fitted on the bushing 100.

[0030] A sealing disc 200 is sleeved on a bushing 100. A gap cavity 400 is reserved between the sealing disc 200 and the bushing 100. The sealing disc 200 is provided with a stationary ring 210, which is located at one end of the gap cavity 400. The stationary ring 210 and the moving ring 110 are sealed together and block the communication path between one end of the gap cavity 400 and the outside.

[0031] The skeleton oil seal 300 is located at the other end of the clearance cavity 400. The skeleton oil seal 300 seals between the bushing 100 and the sealing disc 200 and blocks the communication path between the other end of the clearance cavity 400 and the outside.

[0032] The sealing disk 200 is provided with a cleaning channel 220. One end of the cleaning channel 220 is located on the outer peripheral surface of the sealing disk 200, and the other end of the cleaning channel 220 is connected to the gap cavity 400.

[0033] The bushing 100 is fixed to the rotating shaft and rotates with it, serving to provide support and position other components. A sealing disc 200 is fitted onto the bushing 100, and a stationary ring 210 is provided on the sealing disc 200. The stationary ring 210 and the rotating ring 110 are in a sealing fit, forming a sealing surface. Both ends of the gap cavity 400 are connected to the outside. The sealing structure formed by the rotating ring 110 and the stationary ring 210 seals one end of the gap cavity 400, while the skeleton oil seal 300 seals the other end, thus isolating the gap cavity 400 from the outside and forming a complete double-end face sealing structure. Therefore, during cleaning, the cleaning fluid can enter the gap cavity 400 through the cleaning channel 220 to clean and cool the sealing surface formed by the rotating ring 110 and the stationary ring 210, effectively removing the frictional heat and minor wear particles generated by the rotating ring 110 and the stationary ring 210. Since the other end of the clearance cavity 400 is sealed by the skeleton oil seal 300, the cleaning fluid will not leak out from the other end of the clearance cavity 400, thus meeting the cleaning and cooling requirements of the double-end mechanical seal. In addition, by replacing the other pair of dynamic rings 110 and stationary rings 210 with the skeleton oil seal 300, the axial length of the mechanical seal can be effectively reduced, making its overall structure more compact and allowing the mechanical seal to be installed in narrow spaces.

[0034] In a double-end mechanical seal, the sealing structure at one end is a dynamic ring 110 and a stationary ring 210, while the sealing structure at the other end is replaced by a skeleton oil seal 300. This effectively reduces the axial length of the mechanical seal, meeting not only the installation requirements in narrow spaces but also the cleaning and cooling requirements.

[0035] It should be noted that traditional double-end mechanical seals require two pairs of rotating / stationary ring friction pairs, resulting in a relatively long axial length. This mechanical seal, however, replaces one end of the rotating / stationary ring friction pair with a skeleton oil seal 300, which has a smaller axial dimension. The skeleton oil seal 300 is a radial seal, and its axial installation space is much smaller than that of a complete mechanical seal pair, thus significantly shortening the overall axial length of the sealing device.

[0036] Based on the above implementation, the stationary ring 210 is located at the end of the gap cavity 400 near the medium side, and the stationary ring 210 and the moving ring 110 are attached to and seal the communication path between the gap cavity 400 and the medium side; the skeleton oil seal 300 is located at the end of the gap cavity 400 near the atmosphere side, and the skeleton oil seal 300 seals the communication path between the gap cavity 400 and the atmosphere side.

[0037] like Figure 1 , Figure 2 As shown, based on the above embodiment, the gap cavity 400 includes a rotating ring mounting chamber 410, a liquid inlet chamber 420, and an oil seal mounting chamber 430 arranged sequentially along its axial direction. The two ends of the liquid inlet chamber 420 are respectively connected to the rotating ring mounting chamber 410 and the oil seal mounting chamber 430. The rotating ring 110 is installed in the rotating ring mounting chamber 410, the skeleton oil seal 300 is installed in the oil seal mounting chamber 430, and the cleaning channel 220 is connected to the liquid inlet chamber 420.

[0038] The rotating ring mounting chamber 410 is used for precise installation and positioning of the rotating ring 110, and the oil seal mounting chamber 430 is used for installation and fixing of the skeleton oil seal 300. Since the rotating ring 110 mounting chamber and the oil seal mounting chamber are located at both ends of the liquid inlet chamber 420, after installing the rotating ring 110 and the skeleton oil seal 300, both ends of the liquid inlet chamber 420 can be effectively sealed, preventing the cleaning fluid from leaking to the outside, while simultaneously cooling and cleaning the sealing surface formed by the rotating ring 110 and the stationary ring 210.

[0039] like Figure 1 As shown, based on the above embodiment, the gap cavity 400 is provided with an elastic element 500. One end of the elastic element 500 is in contact with the stationary ring 210 and the other end is in contact with the sealing disc 200. The elastic element 500 applies an elastic force to the stationary ring 210 to make it tend towards the moving ring 110.

[0040] The elastic element 500 continuously applies a spring force towards the rotating ring 110 to the stationary ring 210. This ensures that the rotating ring 110 and the stationary ring 210 remain in close contact even during equipment vibration or slight wear on the sealing surface, automatically compensating for wear on the sealing surface and maintaining the long-term effectiveness of the seal.

[0041] Preferably, the gap cavity 400 is provided with a washer 600, which abuts against the stationary ring 210, and one end of the elastic member 500 abuts against the washer 600.

[0042] The washer 600 is positioned between the elastic element 500 and the stationary ring 210 to transmit and distribute force. It prevents the end of the spring from directly scraping against the stationary ring 210, while also ensuring that the stationary ring 210 is subjected to more even force, preventing it from tilting due to uneven force distribution.

[0043] like Figure 1As shown, based on the above embodiment, the sealing disc 200 is provided with a stop pin 240, and the stationary ring 210 is circumferentially locked to the sealing disc 200 by the stop pin 240; the bushing 100 is provided with a transmission pin 120, and the moving ring 110 is circumferentially locked to the bushing 100 by the transmission pin 120.

[0044] like Figure 1 As shown, based on the above embodiment, a sealing ring 700 is provided between the bushing 100 and the moving ring 110, and between the sealing disc 200 and the stationary ring 210.

[0045] A sealing ring 700 is provided between the bushing 100 and the rotating ring 110, and between the sealing disc 200 and the stationary ring 210, to seal the static gaps between these components and prevent the medium from leaking from these non-sealing surfaces.

[0046] like Figure 1 As shown, based on the above embodiment, the sealing disk 200 is also provided with a drain channel 230. One end of the drain channel 230 is located on the outer peripheral surface of the sealing disk 200, and the other end of the drain channel 230 is connected to the gap cavity 400.

[0047] The drain channel 230 is used in conjunction with the cleaning channel 220. The cleaning channel 220 is used to inject cleaning fluid, while the drain channel 230 is used to discharge used waste fluid and rinsed impurities from the gap cavity 400.

[0048] like Figure 1 As shown, based on the above embodiment, a fastening ring 130 is fitted on the bushing 100, and a set screw is provided on the fastening ring 130, with the set screw passing through the bushing 100.

[0049] The set screw passes through the fastening ring 130 and the bushing 100 and abuts against the surface of the rotating shaft, thereby locking the fastening ring 130, the bushing 100 and the rotating shaft circumferentially.

[0050] Based on the above embodiments, the fastening ring 130 is provided with a positioning block 140, the sealing disc 200 is connected to the positioning block 140, and the sealing disc 200 is axially locked to the positioning block 140.

[0051] The retaining ring 130 is securely fixed to a specific axial position on the bushing 100 by a set screw. This means that the position of the retaining ring 130 is fixed, and the sealing disc 200 is connected to the positioning block 140 on the retaining ring 130. This achieves precise positioning of the sealing disc 200 in the axial position of the bushing 100. Simply put, the positioning element enables the positioning of the sealing disc 200 and the retaining ring 130, thereby achieving the axial positioning of the sealing disc 200 in the bushing 100.

[0052] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0053] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0056] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A cartridge mechanical seal with a skeleton oil seal, characterized in that, include: A bushing (100) is provided with a rotating ring (110); A sealing disc (200) is fitted onto the bushing (100). A gap cavity (400) is reserved between the sealing disc (200) and the bushing (100). The sealing disc (200) is provided with a stationary ring (210). The stationary ring (210) is located at one end of the gap cavity (400). The stationary ring (210) and the moving ring (110) are sealed together and seal the communication path between one end of the gap cavity (400) and the outside. A skeleton oil seal (300) is located at the other end of the gap cavity (400). The skeleton oil seal (300) seals between the bushing (100) and the sealing disc (200) and blocks the communication path between the other end of the gap cavity (400) and the outside. The sealing disc (200) is provided with a cleaning channel (220), one end of which is located on the outer circumferential surface of the sealing disc (200), and the other end of which is connected to the gap cavity (400).

2. A cartridge mechanical seal with a skeleton oil seal as described in claim 1, characterized in that: The stationary ring (210) is located at the end of the gap cavity (400) near the medium side. The stationary ring (210) and the moving ring (110) are attached to each other and seal the communication path between the gap cavity (400) and the medium side. The skeleton oil seal (300) is located at the end of the gap cavity (400) near the atmosphere side. The skeleton oil seal (300) seals the communication path between the gap cavity (400) and the atmosphere side.

3. A cartridge mechanical seal with a skeleton oil seal as described in claim 1 or 2, characterized in that: The gap cavity (400) includes a rotating ring mounting chamber (410), a liquid inlet chamber (420), and an oil seal mounting chamber (430) arranged sequentially along its axial direction. The two ends of the liquid inlet chamber (420) are respectively connected to the rotating ring mounting chamber (410) and the oil seal mounting chamber (430). The rotating ring (110) is installed in the rotating ring mounting chamber (410), the skeleton oil seal (300) is installed in the oil seal mounting chamber (430), and the cleaning channel (220) is connected to the liquid inlet chamber (420).

4. A cartridge mechanical seal with a skeleton oil seal as described in claim 1, characterized in that: The gap cavity (400) is provided with an elastic element (500), one end of which is in contact with the stationary ring (210) and the other end is in contact with the sealing disc (200). The elastic element (500) applies a spring force to the stationary ring (210) to make it tend toward the moving ring (110).

5. A cartridge mechanical seal with a skeleton oil seal as described in claim 4, characterized in that: The gap cavity (400) is provided with a washer (600), the washer (600) abuts against the stationary ring (210), and one end of the elastic member (500) abuts against the washer (600).

6. A cartridge mechanical seal with a skeleton oil seal as described in claim 1, characterized in that: The sealing disc (200) is provided with a stop pin (240), and the stationary ring (210) is circumferentially locked to the sealing disc (200) by the stop pin (240); the bushing (100) is provided with a transmission pin (120), and the moving ring (110) is circumferentially locked to the bushing (100) by the transmission pin (120).

7. A cartridge mechanical seal with a skeleton oil seal as described in claim 1, characterized in that: A sealing ring (700) is provided between the bushing (100) and the moving ring (110) and between the sealing disc (200) and the stationary ring (210).

8. A cartridge mechanical seal with a skeleton oil seal as described in claim 1, characterized in that: The sealing disc (200) is also provided with a drainage channel (230), one end of which is located on the outer peripheral surface of the sealing disc (200), and the other end of which is connected to the gap cavity (400).

9. A cartridge mechanical seal with a skeleton oil seal as described in claim 1, characterized in that: A fastening ring (130) is fitted on the bushing (100), and a set screw is provided on the fastening ring (130), the set screw passing through the bushing (100).

10. A cartridge mechanical seal with a skeleton oil seal as described in claim 9, characterized in that: The fastening ring (130) is provided with a positioning block (140), the sealing disc (200) is connected to the positioning block (140), and the sealing disc (200) and the positioning block (140) are axially locked.

Images