CN211527730U

CN211527730U - Sealing device for detecting vacuum state of ship tail shaft seal

Info

Publication number: CN211527730U
Application number: CN201921785180.3U
Authority: CN
Inventors: 侯广军; 周亚全
Original assignee: Chengxi Shipyard Co Ltd
Current assignee: Chengxi Shipyard Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-09-18
Anticipated expiration: 2029-10-23

Abstract

The utility model discloses a sealed vacuum state detection sealing device of boats and ships tailing axle, be provided with a plurality of sealed cavities at the tailing axle position of boats and ships, sealing device is including setting up the detection mouth on the lateral wall of every sealed cavity, and the detection mouth is used for detecting the internal seal state of cavity, is connected with the inlet port of check valve on the detection mouth of every sealed cavity respectively, and the other end of check valve is equipped with sealing device connection port; the sealing device comprises a detection tube, one end of the detection tube is provided with the other end connected with the check valve, the other end of the detection tube is connected with a vacuum generator, the detection tube is connected with a control valve in series, the detection tube on one side of the control valve is provided with a vacuum degree detection port and a humidity detection port, an elastic adhesive film is arranged on the vacuum degree detection port, a conductive layer is attached to the elastic adhesive film, the upper end or the lower end of the vacuum degree detection port is provided with a pair of electrodes which correspond to the conductive layer in position and are isolated, the pair of electrodes are connected with a controller and the like through wires, and a humidity sensor is installed on the.

Description

Sealing device for detecting vacuum state of ship tail shaft seal

Technical Field

The utility model relates to a boats and ships tailing axle installation detects art field, concretely relates to sealed vacuum state of boats and ships tailing axle detects sealed device.

Background

The ship stern shaft is a connecting shaft between the propeller and the engine, the engine drives the propeller to rotate through the ship stern shaft, and axial thrust generated by rotation of the propeller is transmitted to the ship body to drive the ship to advance. In order to prevent seawater from entering the ship along the stern shaft or prevent lubricating oil in the engine from leaking out of the ship, a stern shaft sealing device is required to be arranged on the ship stern shaft.

The existing ship stern shaft seal comprises a plurality of seal cavities, a connector is arranged on each seal cavity, and lubricating oil or air is introduced into each seal cavity to seal the ship stern shaft. In order to ensure that the stern shaft can normally work after being installed, the tightness of stern shaft seal needs to be tested, the problem that the stern shaft seal is unqualified when the assembly is installed in place and then tested is solved, and then the assembly is disassembled, so that a large amount of manpower, material resources and time are wasted.

At present, the two ends of a sealing device are generally plugged by sealing plates, the sealing plates and the outermost sealing elements form a sealing cavity together, and then the sealing performance of the sealing is checked by a method of injecting water into the sealing cavity through a connecting port, however, the method has two problems, namely, the sealing inspection of the sealing cavity formed between the sealing plates and the outermost sealing elements can only be checked, the sealing performance of the rest of the sealing devices cannot be checked, and the sealing performance is checked by frequently disassembling and assembling the sealing plates, a screw rod and an eraser, so that the process is complicated and the eraser is more consumed; simultaneously, test the hourglass through observing water pressure, still need carry out the drainage and handle the steam on the sealing member after the sealing member inspection is accomplished, increase the inspection process to reduce inspection efficiency.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a simple structure, convenient to use, survey directly perceived, need not frequent dismouting and can detect stern shaft sealing device, can carry out quick accurate the detection to the encapsulated situation of all sealed cavities, but also can carry out the sealed cavity vacuum state sealing device of boats and ships stern shaft that detects to the encapsulated situation in each sealed cavity of boats and ships operation overall process.

In order to achieve the purpose, the technical scheme of the utility model is to design a sealing device for detecting the vacuum state of the seal of the tail shaft of a ship, the sealing device comprises a detection port arranged on the side wall of each sealing cavity, the detection port is used for detecting the internal sealing state of the cavity, the detection port of each sealing cavity is respectively connected with the air inlet port of a one-way valve, or a plurality of detection ports are connected in series and then connected with the air inlet port of the one-way valve through a connecting piece, and the other end of the one-way valve is provided with a connecting port of the sealing device; the sealing device also comprises a detection tube, one end of the detection tube is provided with a detection port connected with the other end of the one-way valve, the other end of the detection tube is connected with a vacuum generator, the detection tube is connected with a control valve in series, the detection tube on one side of the control valve is provided with a vacuum degree detection port and a humidity detection port, an elastic adhesive film is arranged on the vacuum degree detection port, a conductive layer is attached to the elastic adhesive film, a pair of electrodes which correspond to the conductive layer in position and are isolated are arranged at the upper end or the lower end of the vacuum degree detection port, the pair of electrodes are connected with a controller, an alarm or an indicator lamp through leads, and when the negative pressure in the detection tube reaches a set negative pressure value, the elastic adhesive film is sunken; a humidity sensor is mounted on the humidity detection port.

In order to facilitate that the sealed cavity of the ship tail shaft can still keep a good sealed state after a vacuum sealing device is disassembled from a sealed detection port of the sealed cavity of the ship tail shaft without carrying out separate sealing treatment, the preferred technical proposal is that the check valve comprises an upper threaded pipe provided with internal threads and a lower threaded pipe provided with external threads, one end of the external threads on the lower threaded pipe is in threaded connection with the detection port provided with a screw hole, an inward concave conical surface is arranged on the port of the other end of the external threads on the lower threaded pipe, a rubber pad or a rubber coating is attached to the inward concave conical surface, a rubber ball is arranged on the conical surface, the rubber ball is pressed by one end of a pressing spring, the other end of the external threads on the lower threaded pipe is connected with the internal threads on one end of the upper threaded pipe, an annular groove is also arranged on the inner wall of the upper threaded pipe, and a spring ring is arranged in the annular groove, the other end of the jacking spring is jacked on the spring expanding ring.

In order to monitor whether the sealing state in the ship tail shaft sealing cavity fails or whether water enters the ship tail shaft sealing cavity at any time, the technical scheme is further preferably that a plastic sleeve tightly matched with the inner wall of the lower threaded pipe is arranged in the lower threaded pipe, two electrode plates which are isolated from each other are arranged on the inner wall of the plastic sleeve, and the electrode plates are connected to the outside of the lower threaded pipe through a lead. After the seal in the ship tail shaft seal cavity is failed and water enters, two electrode plates isolated from each other form a conduction state through water, and then an alarm signal can be sent out, or lubricating oil is filled in the ship tail shaft seal cavity, the resistance of a lubricating oil medium between the two electrode plates isolated from each other is far larger than that of water, and the seal state in the ship tail shaft seal cavity can be detected by measuring the conductive resistance between the two electrode plates isolated from each other.

In order to facilitate the loading and unloading of the sealing device for the sealing vacuum state detection of the ship tail shaft and facilitate the air in the sealing cavity of the ship tail shaft to be discharged out of the sealing cavity, the further preferred technical scheme is that the two ends of the detection tube are respectively provided with an external thread section, the external thread section at one end of the detection tube is connected with the internal thread section at the other end of the upper threaded tube of the check valve, the external thread section at the other end of the detection tube is in threaded connection with a screw hole on a vacuum generator, the vacuum generator is of a Venturi tube structure, and the screw hole is arranged at the throat part of the Venturi tube.

In order to quickly and conveniently detect the vacuumizing condition in the sealed cavity of the tail shaft of the ship and simplify the structural structure of a sealing device, so that the detection operation is more visual and quick, the preferred technical scheme is that the vacuum degree detection port is connected with the elastic rubber film through a connecting pipe, one end of the connecting pipe is connected with a screw hole arranged on the vacuum degree detection port through an external thread section, sealant is coated at the joint, or one end of the connecting pipe is connected with the vacuum degree detection port through welding or bonding, the other end of the connecting pipe is also provided with the external thread section, the external thread section at the other end of the connecting pipe is connected with an internal thread on the bulge inner wall, the upper end of the bulge is a plane, a through hole smaller than the diameter of the bulge inner wall is arranged on the plane, the elastic rubber film is arranged on the inner plane of the bulge on the through hole facing to the screw hole, and an elastic gasket is arranged, the inner wall of the connecting pipe is tightly matched with a plastic sleeve, the inner wall of the plastic sleeve is provided with two electrode plates which are separated from each other, and the electrode plates are connected to the outside of the connecting pipe through a lead. The elastic adhesive film is pressed on the top of the connecting pipe through the pressing cap, after air in a ship tail shaft sealing cavity connected with the detection pipe is pumped out by a vacuum generator, the elastic adhesive film is sunken downwards under the action of external atmospheric pressure, and due to the fact that the conductive layer is attached to the surface of the elastic adhesive film sunken downwards, the conductive layer can be used for communicating a pair of electrodes arranged inside the connecting pipe to send out an alarm signal or an indicator light, or enabling a pair of electrode sections arranged on the pressing cap to be separated, and the alarm signal can be sent out or a signal lamp can be extinguished.

In order to facilitate firmly fixing the elastic adhesive film in the press cap, and simultaneously facilitate adjusting the distance between the elastic adhesive film and the pair of electrode plates so as to measure different negative pressure states, and further facilitate the replacement of the elastic adhesive film, the press cap is internally provided with a pressing sheet of the elastic adhesive film, the pressing sheet is provided with a thread inner ring which is a hexagonal hole or a pressing sheet which is a square hole for an outer ring, the outer ring provided with threads is used for being connected with an inner thread hole of the press cap, and the hexagonal hole or the square hole is used for screwing the pressing sheet into the inner thread hole of the press cap by using a tool and pressing and fixing the elastic adhesive film and an inner plane of the press cap.

In order to facilitate installation of the electrode plates, adjustment of the distance between the electrode plates and replacement of the electrode plates, and adjustment of the distance between the electrode plates and the elastic adhesive film, the electrode plates are L-shaped, and one side of the L-shaped electrode plates is inserted into the slots on the side wall of the plastic sleeve or is bonded on the side wall of the plastic sleeve.

In order to facilitate control of the starting or stopping working state of the sealing device for the sealing vacuum state detection of the ship tail shaft, the preferred technical scheme is that the control valve is an electromagnetic valve or a manual ball valve.

In order to ensure that good sealing performance can be kept for a long time after the vacuum state in the ship tail shaft sealing cavity is detected, and meanwhile, the air or water in the ship tail shaft sealing cavity is prevented from entering due to misoperation or accidental touch.

In order to avoid the leakage problem of the sealing state at the joint part of the pipe connection, the preferable technical scheme is that the detection port part of the sealing chamber connected with the one-way valve is coated with sealing glue.

The utility model has the advantages and the beneficial effects that: the vacuum state sealing device of the ship tail shaft sealing cavity has the characteristics of simple structure, convenience in use, intuitional observation, no need of frequent disassembly and assembly, capability of detecting the tail shaft sealing device, capability of quickly and accurately detecting the sealing state of all the sealing cavities, capability of detecting the sealing state in each sealing cavity in the whole process of ship operation and the like. The sealing device can avoid that external gas or moisture enters the ship tail shaft sealing cavity after being detached from the sealing device through the check valve arranged at the detection port of the ship tail shaft sealing cavity, and is convenient for the disassembly and assembly detection of the sealing device. In addition, the conductive layer is coated on the surface of the elastic adhesive film, so that the conductive layer and the pair of electrode plates form a conduction circuit, and a detection signal of the vacuumizing state in the ship tail shaft sealing cavity is sent out, so that the detection efficiency is higher, more visual, more concise and more convenient. In addition, the problems that whether water enters the sealed cavity of the ship tail shaft or not can be monitored at any time through a pair of electrodes arranged in the one-way valve.

Drawings

Fig. 1 is a schematic structural view of a vacuum state sealing device of a ship tail shaft sealing chamber of the invention;

FIG. 2 is a schematic cross-sectional view of the one-way valve portion of FIG. 1;

fig. 3 is a schematic view showing a structure of a connection pipe portion connected to the detection pipe of fig. 1.

In the figure: 1. a sealing device; 1.1, detecting a tube; 1.2, a vacuum degree detection port; 1.3, a humidity detection port; 2. a detection port; 3. a one-way valve; 3.1, an air inlet port; 3.2, sealing the device connecting port; 3.3, screwing a threaded pipe; 3.4, a lower threaded pipe; 3.5, a rubber pad; 3.6, rubber balls; 3.7, pressing a spring; 3.8, a spring piston ring; 3.9, plastic sleeve; 3.10, electrode plates; 3.11, conducting wires; 4. a vacuum generator; 5. a control valve; 6. an elastic adhesive film; 6.1, a conductive layer; 7. an electrode; 8. a connecting pipe; 8.1, plastic sleeve; 8.2, electrode plates; 8.3, conducting wires; 9. pressing; 9.1, through holes; 10. an elastic pad; 11. a compression sheet; 12. sealing the cap; 13. a humidity sensor.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1-3, the utility model relates to a sealed vacuum state detection sealing device of boats and ships tail shaft, is provided with a plurality of sealed cavities at the tail shaft position of boats and ships, seal device 1 including setting up detection mouth 2 on the lateral wall of each sealed cavity, detection mouth 2 is used for detecting the inside sealing state of cavity, is connected with the inlet port 3.1 of check valve 3 on detection mouth 2 of each sealed cavity respectively, or is connected with inlet port 3.1 of check valve 3 through the connecting piece after a plurality of detection mouths 2 concatenate, and the other end of check valve 3 is equipped with sealed device connection port 3.2; the sealing device 1 further comprises a detection tube 1.1, one end of the detection tube 1.1 is provided with a sealing device connecting port 3.2 connected with the other end of the check valve 3, the other end of the detection tube 1.1 is connected with a vacuum generator 4, the detection tube 1.1 is connected with a control valve 5 in series, a vacuum degree detection port 1.2 and a humidity detection port are arranged on the detection tube 1.1 on one side of the control valve 5, an elastic adhesive film 6 is arranged on the vacuum degree detection port 1.2, a conductive layer 6.1 is attached to the elastic adhesive film 6, a pair of electrodes 7 which correspond to and are isolated from the conductive layer 6.1 are arranged at the upper end or the lower end of the vacuum degree detection port 1.2, the pair of electrodes 7 are connected with a controller, an alarm or an indicator lamp (not shown in the figure) through a lead 8, and when the negative pressure in the detection tube 1.1 reaches a set negative pressure value, the elastic adhesive film 6 sinks to enable the conductive layer 6.1; a humidity sensor 13 is attached to the humidity detection port 1.3.

In order to facilitate the vacuum sealing device 1 to be detached from the sealing detection port 2 of the ship tail shaft sealing cavity, the ship tail shaft sealing cavity still can keep a good sealing state without separate sealing treatment, the preferred embodiment of the utility model is that the check valve 3 comprises an upper threaded pipe 3.3 with internal threads and a lower threaded pipe 3.4 with external threads, one end of the external threads on the lower threaded pipe 3.4 is in threaded connection with the detection port 2 with a screw hole, the port of the other end of the external threads on the lower threaded pipe 3.4 is provided with an inwards concave conical surface, a rubber pad 3.5 or a rubber coating is attached on the inwards concave conical surface, a rubber ball 3.6 is arranged on the conical surface, the rubber ball 3.6 is jacked by one end of a jacking spring 3.7, the other end of the external threads on the lower threaded pipe 3.4 is in threaded connection with the internal threads on one end of the upper threaded pipe 3.3, the inner wall of the upper threaded pipe 3.3 is further provided with an annular groove, a spring piston ring 3.8 is arranged in the annular groove, and the other end of the jacking spring 3.7 is jacked on the spring piston ring 3.8.

In order to monitor whether the sealing state in the ship tail shaft sealing cavity fails or whether water enters the ship tail shaft sealing cavity at any time, the utility model discloses a further preferred embodiment is whether be equipped with in the screwed pipe 3.4 down with the plastic sleeve pipe 3.9 that screwed pipe 3.4 inner wall closely cooperates, be equipped with two electrode slice 3.10 of keeping apart each other on the inner wall of plastic sleeve pipe 3.9, electrode slice 3.10 is connected to the outside of screwed pipe 3.3 down through wire 3.11. When the seal in the ship tail shaft seal cavity fails and water enters, the two electrode plates 3.10 isolated from each other form a conduction state through water, and then an alarm signal can be sent out, or lubricating oil is filled in the ship tail shaft seal cavity, the resistance of a lubricating oil medium between the two electrode plates 3.10 isolated from each other is far larger than that of water, and the seal state in the ship tail shaft seal cavity can be detected by measuring the conductive resistance between the two electrode plates 3.10 isolated from each other.

In order to facilitate the loading and unloading of boats and ships tail shaft seal vacuum state detection sealing device, be convenient for simultaneously with the sealed cavity of air escape in the sealed cavity of boats and ships tail shaft, the utility model discloses further preferred embodiment still the both ends of detecting tube 1.1 are equipped with the external screw thread section respectively, and the external screw thread section of detecting tube 1.1 one end is connected with the internal thread section of the last screwed pipe 3.3 of check valve 3 goes up the other end, and the external screw thread section of detecting tube 1.1 other end and the screw threaded connection on vacuum generator 4, vacuum generator 4 is the venturi structure, the screw sets up at venturi's choke position.

In order to detect the vacuuming condition in the sealed cavity of the ship tail shaft quickly and conveniently and simplify the structure of the sealing device 1, so that the detection operation is more visual and rapid, the preferred embodiment of the utility model also comprises that the vacuum degree detection port 1.2 is connected with the elastic rubber film 6 through the connecting pipe 8, one end of the connecting pipe 8 is connected with the screw hole arranged on the vacuum degree detection port 1.2 through the external thread section, and the joint is coated with the sealant, or one end of the connecting pipe 8 is connected with the vacuum degree detection port 1.2 through welding or bonding, the other end of the connecting pipe 8 is also provided with the external thread section, the external thread section of the other end of the connecting pipe 8 is connected with the internal thread on the inner wall of the extruding 9, the upper end of the extruding 9 is a plane, the through hole 9.1 smaller than the diameter of the inner wall of the extruding 9 is arranged on the plane, the elastic rubber film 6 is arranged on the inner plane of the extruding 9, an elastic gasket 10 is arranged between the elastic adhesive film 6 and the upper end face of the connecting pipe 8, a plastic sleeve 8.1 is tightly matched with the inner wall of the connecting pipe 8, two electrode plates 8.2 which are separated from each other are arranged on the inner wall of the plastic sleeve 8.1, and the electrode plates 8.2 are connected to the outside of the connecting pipe 8 through a lead 8.3. The elastic adhesive film 6 is pressed on the upper end of the connecting pipe 8 through the press cap 9, after air in a sealed cavity of the tail shaft of the ship connected with the detection pipe 1.1 is pumped out by the vacuum generator 4, the elastic adhesive film 6 can be sunken downwards under the action of external atmospheric pressure, and as the conductive layer 6.1 is attached to the surface of the elastic adhesive film 6 sunken downwards, the conductive layer 6.1 can connect a pair of electrode plates 8.2 arranged inside the connecting pipe 8 to send out an alarm signal or an indicator light, or enables a pair of electrode plates 8.2 arranged on the press cap 9 to leave, and the alarm signal can be sent out or the signal light can be extinguished.

In order to facilitate firmly fixing elastic adhesive film 6 in pressing and emit 9, also in order to facilitate adjusting the interval between elastic adhesive film 6 and a pair of electrode slice 8.2 simultaneously to be convenient for record different negative pressure states, still in order to facilitate elastic adhesive film 6's change, the utility model discloses further preferred embodiment still has press and emit 9 in the interior cramp 11 that is installed elastic adhesive film 6 of pressing, cramp 11 is equipped with the interior ring of screw thread for six arris holes or cramp 11 for the square hole of outer loop, is equipped with the screwed outer loop and is used for pressing and emits 9's internal thread jogged joint, six arris holes or compress tightly fixedly for the square hole with the instrument with cramp 11 screw in press emit 9's internal thread hole and with elastic adhesive film 6 and press and emit 9's internal planes between.

In order to facilitate the installation of electrode slice 8.2 to and the adjustment of interval between the electrode slice 8.2, also in order to facilitate electrode slice 8.2's change, still in order to facilitate the interval between regulation electrode slice 8.2 and the elastic adhesive membrane 6, the utility model discloses further preferred embodiment still has, electrode slice 8.2 is L shape, and in the slot of grafting on plastic sleeve 8.1 lateral wall, or bond on plastic sleeve 8.1 lateral wall one side of L shape.

In order to facilitate the control of the working state of the ship tail shaft sealing vacuum state detection sealing device 1, the utility model discloses preferred embodiment still has, control valve 5 is the solenoid valve, or is manual ball valve.

In order to guarantee the sealed cavity of boats and ships tail shaft after the interior vacuum state detects, can keep good sealing performance for a long time, avoid the maloperation simultaneously or because of touching the entering that causes the air or the water in the sealed cavity of boats and ships tail shaft unintentionally, the utility model discloses preferred technical scheme still dispose sealed block 12 on the sealing device connecting port 3.2 of the 3 other ends of check valve, sealed block 12 is used for sealing with its port after the sealing device 1 is dismantled to the other end of check valve 3.

In order to avoid causing the leakage problem of encapsulated situation at the interface site of pipe connection, the utility model discloses preferred embodiment still sealed cavity has sealed glue with the 2 position coatings in detection mouth that 3 are connected of check valve.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A ship tail shaft sealing vacuum state detection sealing device is provided with a plurality of sealing chambers at the tail shaft part of a ship and is characterized in that the sealing device comprises a detection port arranged on the side wall of each sealing chamber, the detection ports are used for detecting the internal sealing state of the chambers, the detection ports of each sealing chamber are respectively connected with an air inlet port of a one-way valve, or the detection ports are connected in series and then connected with the air inlet port of the one-way valve through a connecting piece, and the other end of the one-way valve is provided with a sealing device connecting port; the sealing device also comprises a detection tube, one end of the detection tube is provided with a detection port connected with the other end of the one-way valve, the other end of the detection tube is connected with a vacuum generator, the detection tube is connected with a control valve in series, the detection tube on one side of the control valve is provided with a vacuum degree detection port and a humidity detection port, an elastic adhesive film is arranged on the vacuum degree detection port, a conductive layer is attached to the elastic adhesive film, a pair of electrodes which correspond to the conductive layer in position and are isolated are arranged at the upper end or the lower end of the vacuum degree detection port, the pair of electrodes are connected with a controller, an alarm or an indicator lamp through leads, and when the negative pressure in the detection tube reaches a set negative pressure value, the elastic adhesive film is sunken; a humidity sensor is mounted on the humidity detection port.

2. The vacuum state detecting and sealing device for the sealing of the stern shaft of a ship as claimed in claim 1, wherein the check valve comprises an upper threaded pipe provided with an internal thread and a lower threaded pipe provided with an external thread, one end of the external thread on the lower threaded pipe is in threaded connection with a detection port provided with a screw hole, an inwardly recessed conical surface is provided on a port of the lower threaded pipe at the other end of the external thread, a rubber pad or a rubber coating is attached to the inwardly recessed conical surface, a rubber ball is mounted on the conical surface, the rubber ball is pressed by one end of a pressing spring, the other end of the external thread on the lower threaded pipe is in threaded connection with the internal thread at the one end of the upper threaded pipe, an annular groove is further provided on the inner wall of the upper threaded pipe, a spring expansion ring is mounted in the annular groove, and the other end of the pressing spring is.

3. The vacuum state detection sealing device for the ship tail shaft seal according to claim 2, wherein a plastic sleeve pipe closely matched with the inner wall of the lower threaded pipe is arranged in the lower threaded pipe, two electrode plates which are separated from each other are arranged on the inner wall of the plastic sleeve pipe, and the electrode plates are connected to the outside of the lower threaded pipe through a lead.

4. The vacuum state detecting sealing device for sealing the stern shaft of a ship as claimed in claim 3, wherein the detecting tube is provided at both ends thereof with external screw sections, respectively, the external screw section at one end of the detecting tube is connected with the internal screw section at the other end of the upper screw tube of the check valve, the external screw section at the other end of the detecting tube is connected with a screw hole of the vacuum generator in a screw manner, the vacuum generator has a venturi tube structure, and the screw hole is provided at a throat portion of the venturi tube.

5. The vacuum state detecting and sealing device for a stern shaft seal of a ship as claimed in claim 1, wherein the vacuum degree detecting port is connected to the elastic rubber film through a connecting pipe, one end of the connecting pipe is connected to a screw hole provided on the vacuum degree detecting port through an external screw thread section, and a sealant is coated at the connection, or one end of the connecting pipe is connected to the vacuum degree detecting port through welding or bonding, the other end of the connecting pipe is also provided with an external screw thread section, the external screw thread section of the other end of the connecting pipe is connected to an internal screw thread on an inner wall of the press cap, an upper end of the press cap is a plane, a through hole smaller than the diameter of the inner wall of the press cap is provided on the plane, an elastic rubber film is provided on an inner plane of the press cap facing the screw hole, an elastic gasket is provided between the elastic rubber film and the upper end face of the connecting pipe, a plastic sleeve, the electrode plate is connected to the outside of the connection pipe through a wire.

6. The vacuum state detection sealing device for the ship tail shaft seal according to claim 5, wherein a pressing piece of the elastic adhesive film is installed in the press cap, the pressing piece is a pressing piece with an outer ring provided with a thread and an inner ring provided with a hexagonal hole or a square hole, the outer ring provided with the thread is used for being connected with an inner thread hole of the press cap, and the hexagonal hole or the square hole is used for screwing the pressing piece into the inner thread hole of the press cap by a tool and pressing and fixing the elastic adhesive film and the inner plane of the press cap.

7. The sealing device for detecting the vacuum state of the seal of the stern shaft of the ship as claimed in claim 3 or 5, wherein the electrode plate is L-shaped, and one side of the L-shape is inserted into the slot on the side wall of the plastic sleeve or is adhered to the side wall of the plastic sleeve.

8. The vacuum state detection sealing device for the stern shaft seal of the ship as claimed in claim 1, wherein the control valve is an electromagnetic valve or a manual ball valve.

9. The vacuum state detection sealing device for the stern shaft seal of the ship as claimed in claim 1, wherein a sealing cap is provided at the sealing device connecting port at the other end of the check valve, and the sealing cap is used for sealing the port of the check valve after the sealing device is removed from the other end of the check valve.

10. The vacuum state detection sealing device for the ship tail shaft seal according to claim 1, wherein a sealing glue is coated on a detection port portion of the sealing chamber connected with the one-way valve.