High-linear-speed sealing device

Abstract

The invention relates to a high-linear-speed sealing device which comprises an installation base body, a spring assembly, a movable ring, a static ring base and a static ring, the static ring and the movable ring form a sealing pair, a sealing ring is arranged between the static ring base and the static ring, cooling water channels are formed in the installation base body and the static ring base respectively, and the cooling water channel of the installation base body is communicated with the cooling water channel in the static ring base. The cooling water channel on the static ring seat is communicated with the working surfaces of the static ring and the moving ring sealing pair through the water channel of the static ring, so that cooling water can directly reach the working surfaces of the static ring and the moving ring sealing pair and take away friction heat of the sealing pair, and the cooling requirement of high friction heat of the sealing surface of the large-shaft-diameter high-linear-speed sealing device is met. And a displacement sensor and an infrared temperature sensor are arranged on the static ring seat, so that the requirements of sealing pair abrasion loss and sealing pair temperature real-time monitoring data required by fault pre-judgment and service life analysis of the sealing device are met.

Description

Technical Field

[0001] The invention relates to a stern shaft end face sealing device of a ship power propulsion system, in particular to a high linear speed sealing device. Background Art

[0002] The stern shaft end face seal is used to seal the part of the propeller-propelled ship shaft passing through the stern tube to isolate seawater from entering the cabin. It is one of the main components of the ship shaft system. The stern shaft end face sealing device is a mechanical sealing device, which is composed of the contact surfaces of the static ring and the dynamic ring in the device to form a mechanical sealing pair, and cooling water is required to take away the heat generated by the end face sealing pair; the existing stern shaft end face sealing device mainly takes away most of the heat generated by the static ring and the dynamic ring sealing pair through the cooling water of the water inlet channel on the mounting seat body or the water flow formed by the cooling water on the water inlet channel of the static ring seat, such as the disclosed "Ship Stern Shaft Water Lubrication Sealing Device" (Announcement No. CN207762250U) and "Stern Shaft Sealing Device with Cooling Structure" (Announcement No. CN214367732U) patents; however, for the stern shaft end face sealing device with an extra-large shaft diameter, due to the high relative linear velocity between the static ring and the dynamic ring, the friction heat of the sealing pair generated is relatively large, and the cooling water design structure of the existing sealing device may not be able to take away the heat generated by the sealing pair in time, resulting in excessive temperature and damage to the sealing surfaces of the static ring and the dynamic ring, and ultimately failure of the sealing pair leads to failure of the sealing device product function. Moreover, the sealing device has no design for detecting the wear of the static and dynamic ring sealing pairs and the temperature of the sealing pairs, and is therefore unable to monitor the operating status of the sealing pairs in real time, and is unable to provide operating data support for fault prediction and life analysis of the sealing device. Summary of the invention

[0003] In view of the operating characteristics and usage requirements of ultra-large shaft diameter high linear speed sealing devices, the present invention proposes a high linear speed sealing device to meet the cooling requirements of the high friction heat of the sealing surface of the large shaft diameter high linear speed sealing device, as well as the real-time monitoring data requirements of the seal pair wear amount and seal pair temperature required for the failure prediction and life analysis of the sealing device, thereby improving the performance and reliability of the high linear speed sealing device.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is: a high linear speed sealing device, including a mounting seat body, a spring assembly, a dynamic ring, a stationary ring seat, a stationary ring, a sealing pair formed by the stationary ring and the dynamic ring, a sealing ring is arranged between the stationary ring seat and the stationary ring, and cooling water channels are respectively arranged on the mounting seat body and the stationary ring seat, the cooling water channel of the mounting seat body is connected to the cooling water channel on the stationary ring seat, and the cooling water channel on the stationary ring seat is connected to the working surfaces of the stationary ring and the dynamic ring sealing pair through the water channel of the stationary ring, so that the cooling water can directly reach the working surfaces of the stationary ring and the dynamic ring sealing pair and take away the friction heat of the sealing pair, thereby meeting the cooling demand of the high friction heat of the sealing surface of the large shaft diameter high linear speed sealing device.

[0005] Furthermore, a displacement sensor and an infrared temperature sensor are provided on the stationary ring seat for detecting the wear amount of the sealing pair required for prejudgment of sealing device failure and life analysis, as well as real-time monitoring of the sealing pair temperature.

[0006] Furthermore, a cooling water inlet channel a is provided in the mounting seat body. After the cooling water enters the channel a, it is divided into two paths. One path enters the inner cavity of the sealing device through the oblique channel b of the mounting seat body; the other path enters the stationary ring seat channel c through the pipe. The stationary ring seat, sealing ring, sealing belt and stationary ring form a closed annular cavity.

[0007] Furthermore, the cooling water in the stationary ring seat channel c enters the channel d on the stationary ring through the closed cavity, and finally enters the working surface of the stationary ring and dynamic ring sealing pair, leaks through the working surface of the sealing pair to the inside of the sealing device and the outside of the sealing pair, taking away the friction heat of the sealing pair.

[0008] Furthermore, the sealing ring is dovetail-shaped and embedded in the dovetail groove in the stationary ring seat, which can ensure that the sealing ring does not fall off and effectively seals.

[0009] Furthermore, a plurality of channels d are provided in the circumferential direction of the stationary ring, which can ensure that cooling water effectively enters the entire stationary ring and the dynamic ring sealing pair.

[0010] Furthermore, a hose is provided between the cooling water channel a and the stationary ring seat channel c to adapt to the change in the distance between the stationary ring seat and the mounting seat body caused by the change in the compression amount of the spring assembly during the operation of the sealing device.

[0011] Furthermore, a filter is provided between the cooling water channel a and the stationary ring seat channel c to ensure the cleanliness of the cooling water entering the stationary ring and dynamic ring sealing pair to avoid damaging the working surface of the sealing pair.

[0012] Furthermore, a flow switch is provided between the cooling water channel a and the stationary ring seat channel c. When the cooling water flow is lower than the set value, an alarm is promptly issued for processing to ensure the flow of cooling water entering the stationary ring and dynamic ring seal pair.

[0013] Furthermore, one or more displacement sensors and infrared temperature sensors are arranged on the stationary ring seat, and the infrared temperature sensors are distributed circumferentially on the stationary ring seat, wherein the displacement sensor is used to measure the change in relative distance between the stationary ring seat and the dynamic ring to measure the wear amount of the sealing pair; the infrared temperature sensor is used to measure the dynamic ring temperature at the sealing pair between the stationary ring and the dynamic ring to determine the working surface temperature of the sealing pair.

[0014] The beneficial effects of the present invention are:

[0015] The high linear speed sealing device of the present invention is designed with a cooling water circuit and an internal structure of the sealing device. The cooling water directly reaches the working surfaces of the static ring and the dynamic ring sealing pair and takes away the friction heat of the sealing pair, thereby meeting the cooling demand for the high friction heat of the sealing surface of the large shaft diameter high linear speed sealing device. A displacement sensor and an infrared temperature sensor are arranged on the static ring seat, thereby meeting the real-time monitoring data demand for the seal pair wear amount and the seal pair temperature required for the fault prediction and life analysis of the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a simplified structural diagram of a high linear speed sealing device of the present invention;

[0017] Figure 2 yes Figure 1 A partial enlarged view of point Ⅰ in the middle. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2 As shown, a high linear speed sealing device provided by an embodiment of the present invention is installed on a stern shaft 15, and includes a mounting seat body 1, a spring assembly 2, a hose 3, a filter 4, a hard tube 5, a flow switch 6, a stationary ring seat 7, a sealing ring 8, a displacement sensor 9, a sealing belt 10, a stationary ring 11, a dynamic ring 12, a drive ring 13, an infrared temperature sensor 14, etc.

[0020] A cooling water inlet channel a is provided in the mounting seat body 1. After entering the channel a, the cooling water is divided into two paths. One path enters the inner cavity of the sealing device through the oblique channel b of the mounting seat body 1; the other path enters the stationary ring seat channel c through the hose 3, the filter 4, and the hard tube 5. The stationary ring seat 7, the sealing ring 8, the sealing belt 10, and the stationary ring 11 form a closed annular cavity. The cooling water in the channel c enters the channel d on the stationary ring through the closed cavity, and finally enters the working surface of the sealing pair of the stationary ring 11 and the dynamic ring 12, and leaks to the inside of the sealing device and the outside of the sealing pair through the working surface of the sealing pair, taking away the friction heat of the sealing pair.

[0021] Among them, the sealing ring 8 is dovetail-shaped and embedded in the dovetail groove in the stationary ring seat 7 to ensure that the sealing ring 8 does not fall off and is effectively sealed; a plurality of channels d are provided on the circumference of the stationary ring 11 to ensure that the cooling water effectively enters the entire stationary ring 11 and the dynamic ring 12 sealing pair; a hose 3 is provided between the cooling water channel a and the channel c to adapt to the change in the distance between the stationary ring seat 7 and the mounting seat body 1 caused by the change in the compression of the spring assembly 2 during the operation of the sealing device; a filter 4 is provided between the cooling water channel a and the channel c to ensure the cleanliness of the cooling water entering the stationary ring 11 and the dynamic ring 12 sealing pair to avoid damaging the working surface of the sealing pair; a flow switch 6 is provided between the cooling water channel a and the channel c. When the cooling water flow rate is lower than the set value, an alarm is issued in time for processing to ensure the flow rate of cooling water entering the static ring 11 and the dynamic ring 12 sealing pair.

[0022] like Figure 1 , Figure 2 As shown, a displacement sensor 9 and an infrared temperature sensor 14 are provided on the stationary ring seat 7. According to the specific design requirements of the sealing device, one or more displacement sensors 9 and infrared temperature sensors 14 can be arranged circumferentially distributed on the stationary ring seat 7. The displacement sensor 9 is used to measure the relative distance change between the stationary ring seat 7 and the dynamic ring 12 to measure the wear amount of the sealing pair. The infrared temperature sensor 14 is used to measure the dynamic ring temperature at the sealing pair of the stationary ring 11 and the dynamic ring 12 to determine the working surface temperature of the sealing pair.

Claims

1. A high linear speed sealing device, characterized in that: It includes a mounting seat body, a spring assembly, a moving ring, a stationary ring seat, a stationary ring, and a sealing pair formed by the stationary ring and the moving ring. A sealing ring is arranged between the stationary ring seat and the stationary ring. Cooling water channels are respectively arranged on the mounting seat body and the stationary ring seat. The cooling water channel of the mounting seat body is connected to the cooling water channel on the stationary ring seat. The cooling water channel on the stationary ring seat is connected to the working surfaces of the stationary ring and the moving ring sealing pair through the water channel of the stationary ring, so that the cooling water can directly reach the working surfaces of the stationary ring and the moving ring sealing pair and take away the friction heat of the sealing pair, thereby meeting the cooling requirements of the high friction heat of the sealing surface of the large shaft diameter and high linear speed sealing device.

2. The high linear speed sealing device according to claim 1, characterized in that: The stationary ring seat is equipped with a displacement sensor and an infrared temperature sensor, which are used for prejudgment of sealing device failures, detection of seal pair wear required for life analysis, and real-time monitoring of the seal pair temperature.

3. The high linear speed sealing device according to claim 1, characterized in that: A cooling water inlet channel a is provided in the mounting seat body. After the cooling water enters channel a, it is divided into two paths. One path enters the inner cavity of the sealing device through the oblique channel b of the mounting seat body; the other path enters the stationary ring seat channel c through a pipe. The stationary ring seat, sealing ring, sealing belt and stationary ring form a closed annular cavity.

4. The high linear speed sealing device according to claim 3, characterized in that: The cooling water in the stationary ring seat channel c enters the channel d on the stationary ring through the closed cavity, and finally enters the working surface of the stationary ring and dynamic ring sealing pair, and leaks through the working surface of the sealing pair to the inside of the sealing device and the outside of the sealing pair, taking away the friction heat of the sealing pair.

5. The high linear speed sealing device according to claim 3, characterized in that: A plurality of channels d are arranged around the circumference of the stationary ring to ensure that cooling water can effectively enter the entire stationary ring and dynamic ring sealing pair.

6. The high linear speed sealing device according to claim 3, characterized in that: A hose is provided between the cooling water channel a and the stationary ring seat channel c to adapt to the change in the distance between the stationary ring seat and the mounting seat body caused by the change in the compression of the spring assembly during the operation of the sealing device.

7. The high linear speed sealing device according to claim 3, characterized in that: A filter is provided between the cooling water channel a and the stationary ring seat channel c to ensure the cleanliness of the cooling water entering the stationary ring and dynamic ring sealing pair to avoid damaging the working surface of the sealing pair.

8. The high linear speed sealing device according to claim 3, characterized in that: A flow switch is provided between the cooling water channel a and the stationary ring seat channel c. When the cooling water flow is lower than the set value, an alarm is promptly issued for processing to ensure the flow of cooling water entering the stationary ring and dynamic ring seal pair.

9. The high linear speed sealing device according to claim 1, characterized in that: The sealing ring is dovetail-shaped and embedded in the dovetail groove in the stationary ring seat, which can ensure that the sealing ring does not fall off and effectively seals.

10. The high linear speed sealing device according to claim 1, characterized in that: One or more displacement sensors and infrared temperature sensors are arranged on the stationary ring seat. The infrared temperature sensors are distributed circumferentially on the stationary ring seat. The displacement sensor is used to measure the change in the relative distance between the stationary ring seat and the dynamic ring to measure the wear amount of the sealing pair; the infrared temperature sensor is used to measure the dynamic ring temperature at the sealing pair of the stationary ring and the dynamic ring to determine the working surface temperature of the sealing pair.

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