Deep sea environment simulation device and deep sea equipment performance test method

Abstract

The invention relates to a deep sea environment simulation device and a deep sea equipment performance test method, and the device comprises a pressure cylinder which is used for accommodating fresh water; the pressure increasing and relieving system is connected with the pressure cylinder; the seawater cabin is arranged in the pressure cylinder, the interior of the seawater cabin is used for placing a test object and accommodating seawater, and a deformation part is arranged on the cabin wall of the seawater cabin; wherein when the pressure increasing and releasing system pressurizes fresh water in the pressure cylinder, the fresh water applies pressure to the deformation part, the deformation part deforms to enable the pressure of seawater in the seawater cabin to be increased, and when the pressure increasing and releasing system releases pressure of the fresh water in the pressure cylinder, the deformation part deforms reversely to enable the pressure of the seawater in the seawater cabin to be increased. The pressure of seawater in the seawater cabin is reduced, so that synchronous testing of pressure resistance, sealing performance and the like and corrosion resistance of deep sea equipment is realized, the test investment is reduced, and the test period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of deep - sea equipment test and measurement, and in particular to a deep - sea environment simulation device and a deep - sea equipment performance test method. Background Art

[0002] In order to test the pressure resistance and sealing performance of the pressure - resistant structure of deep - sea equipment, an external pressure test assessment is often carried out using a deep - sea environment simulation test device (also known as a "pressure cylinder system"). At present, the pressure cylinder systems in use in China are relatively complete in terms of test device size and test pressure specifications, and can better simulate the deep - water pressure environment.

[0003] During the long - term service of deep - sea equipment, it also faces the problem of seawater environmental corrosion. In order to test the corrosion resistance of the deep - sea pressure - resistant structure, corrosion tests are usually carried out under normal pressure using seawater as the environmental medium.

[0004] With the gradual improvement of the accuracy requirements for the structural performance test of deep - sea equipment, it is necessary to synchronously test the performance such as pressure resistance and sealing and corrosion resistance of deep - sea equipment. However, the current test devices cannot meet the requirements. Summary of the Invention

[0005] The applicant of the present invention aims at the above - mentioned disadvantages in the existing production technology, and provides a deep - sea environment simulation device and a deep - sea equipment performance test method, so as to realize the synchronous test of the performance such as pressure resistance and sealing and corrosion resistance of deep - sea equipment, reduce the test investment, and shorten the test cycle.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A deep - sea environment simulation device includes:

[0008] A pressure cylinder for containing fresh water;

[0009] A pressure addition and relief system connected to the pressure cylinder;

[0010] A seawater tank arranged inside the pressure cylinder, where the inside of the seawater tank is used to place the test object and contain seawater, and a deformation part is arranged on the wall of the seawater tank;

[0011] Wherein, when the pressure addition and relief system pressurizes the fresh water in the pressure cylinder, the fresh water exerts pressure on the deformation part, and the deformation part deforms, so that the pressure of the seawater in the seawater tank increases; when the pressure addition and relief system relieves the pressure of the fresh water in the pressure cylinder, the deformation part deforms in the reverse direction, so that the pressure of the seawater in the seawater tank decreases.

[0012] As a further improvement of the above - mentioned technical solution:

[0013] The seawater tank includes a hatch cover sealed and installed at the hatch of the seawater tank. A support is arranged inside the seawater tank, and the support is used for fixedly placing the test object.

[0014] It also includes a first pipe orifice and a second pipe orifice communicating the inside and outside of the seawater tank, and sealing plugs are installed at both the first pipe orifice and the second pipe orifice.

[0015] The volume change amount ΔV of the seawater tank that can be provided by the deformation of the deformation part s needs to satisfy:

[0016] ΔV s ≥k h P T V 0c ,

[0017] wherein, k h is the compressibility of seawater, m 2 / N; = P T is the difference between the target test pressure and the atmospheric pressure, MPa; V 0c is the volume of seawater filled in the seawater tank under the atmospheric pressure state, m 3 .

[0018] The deformation part is a variable-volume cavity, and an interface is arranged on one side of the deformation part. The interface is connected to the seawater tank so that the inner cavity of the deformation part is communicated with the inside of the seawater tank.

[0019] The deformation part is installed at the bottom of the seawater tank.

[0020] The deformation part is spherical, and the material of the deformation part is rubber.

[0021] A first through-hull member is arranged on the side wall of the seawater tank, and a second through-hull member is arranged on the side wall of the pressure cylinder. The first through-hull member and the second through-hull member correspond to each other and are used for threading and connecting the cables of the test object.

[0022] A method for testing the performance of deep-sea equipment includes the following steps:

[0023] Place the test object in a sealed seawater tank containing seawater;

[0024] Place the seawater tank in a pressure cylinder containing fresh water. The two sides of the deformation part on the seawater tank wall are the seawater and the fresh water respectively;

[0025] Use a pressure addition and relief system to pressurize the fresh water in the pressure cylinder to cause the deformation part to deform, and the pressure of the seawater in the seawater tank increases;

[0026] When the pressure of the seawater in the seawater tank reaches the target test pressure, conduct the test.

[0027] As a further improvement of the above technical solution:

[0028] After the test is completed, a pressure addition and relief system is used to relieve the pressure of the fresh water in the pressure cylinder, and the deformation part deforms in the reverse direction, reducing the pressure of the sea water in the sea water tank.

[0029] The beneficial effects of the present invention are as follows:

[0030] The structure of the present invention is compact and reasonable, and it is convenient to operate. By providing a local sea water environment for the test object in a fresh water environment through the sea water tank, and ensuring that the pressures of the fresh water environment and the sea water environment are the same through the deformation part on the side wall of the sea water tank, indirect pressurization of the sea water by the pressure addition and relief system is realized, coupling the sea water pressure environment and the corrosion environment. Using the original pressure cylinder system for pressurization can meet the requirements of both the pressure environment and the corrosion environment at the same time. It is only necessary to design and manufacture the auxiliary device according to different test conditions and test objects, realizing synchronous testing of the pressure resistance, sealing and other performances and corrosion resistance of deep-sea equipment, reducing test investment and shortening the test cycle.

[0031] At the same time, the present invention also has the following advantages:

[0032] (1) Place the deformation part of the cavity structure at the bottom of the sea water tank, which is convenient for installation and disassembly, and is conducive to protecting the deformation part of the cavity structure from unnecessary rubbing and scratching; in addition, with the deformation part at the bottom, when injecting sea water into the sea water tank, the deformation part can be effectively filled with liquid and air can be discharged in the first time.

[0033] (2) The deformation part of the cavity structure is connected to the sea water tank through an interface, which is convenient for replacing deformation parts with different volumes, making the volume of the deformation part adapt to the target test pressure, and facilitating the adjustment and design of the volume change of the sea water tank.

[0034] (3) Place the test object in a deformable and sealed sea water tank, immerse the sea water tank in a fresh water environment, and use the existing pressure cylinder system to provide a high-pressure environment for the sea water tank. While the sea water tank provides a corrosion environment for the test object, the internal and external media of the sea water tank are both in a high-pressure state, coupling the sea water pressure environment and the corrosion environment, and realizing synchronous testing of the pressure resistance, sealing and other performances and corrosion resistance of deep-sea equipment. Description of the Drawings

[0035] Figure 1 It is a schematic structural diagram of the deep-sea environment simulation device of the present invention.

[0036] Figure 2 It is a schematic structural diagram of the auxiliary device of the present invention.

[0037] Figure 3 It is a cross-sectional view of the auxiliary device of the present invention (excluding the hatch cover and the deformation part).

[0038] Figure 4is Figure 3 the top view of

[0039] Figure 5 is the structural schematic diagram of the deformation part of the present invention.

[0040] Figure 6 is the structural schematic diagram of the hatch cover of the present invention.

[0041] Wherein:

[0042] 1. Pressure cylinder; 2. Test object;

[0043] 3. Auxiliary device;

[0044] 31. Seawater tank; 310. Deformation part; 3101. Interface; 3102. Clamp; 311. Connecting pipe; 312. First through-hull component; 313. Hatch cover; 314. First pipe orifice; 315. Second pipe orifice; 316. Flange; 317. Sealing ring;

[0045] 32. Base; 321. Support pillar; 322. Base plate;

[0046] 33. Support;

[0047] 4. Pressure addition and relief system. Specific embodiments

[0048] The following combines the drawings to illustrate the specific embodiments of the present invention.

[0049] In an exemplary embodiment, as Figure 1 is the structural schematic diagram of the deep-sea environment simulation device. The deep-sea environment simulation device includes a pressure cylinder 1, a pressure addition and relief system 4, and a seawater tank 31.

[0050] The pressure cylinder 1 is used to hold fresh water;

[0051] The pressure addition and relief system 4 is connected to the pressure cylinder 1;

[0052] The seawater tank 31 is arranged inside the pressure cylinder 1. The inside of the seawater tank 31 is used to place the test object 2 and hold seawater. A deformation part 310 is arranged on the cabin wall of the seawater tank 31;

[0053] Wherein, when the pressure addition and relief system 4 pressurizes the fresh water in the pressure cylinder 1, the fresh water exerts pressure on the deformation part 310, and the deformation part 310 deforms, so that the pressure of the seawater in the seawater tank 31 increases. When the pressure addition and relief system 4 relieves the pressure of the fresh water in the pressure cylinder 1, the deformation part 310 deforms in the reverse direction, so that the pressure of the seawater in the seawater tank 31 decreases.

[0054] In an exemplary embodiment, as Figure 2As shown, the seawater tank 31 includes a hatch cover 313 hermetically installed at the hatch of the seawater tank 31. A support 33 is arranged inside the seawater tank 31, and the support 33 is used to fixedly place the test object 2.

[0055] In an exemplary embodiment, as Figure 2 shown, it further includes a first pipe orifice 314 and a second pipe orifice 315 that communicate the inside and outside of the seawater tank 31. Sealing plugs are installed at both the first pipe orifice 314 and the second pipe orifice 315.

[0056] Specifically, the deformation part 310 belongs to a part of the seawater tank 31. The deformation part 310 can deform to change the volume of the seawater tank 31, and the number of the deformation parts 310 can be multiple; as Figure 2 、 Figure 6 shown, the first pipe orifice 314 and the second pipe orifice 315 are located on the hatch cover 313. A base 32 is arranged at the bottom of the seawater tank 31. The seawater tank 31 is fixedly installed on the support in the pressure cylinder 1 through the base 32. The support in the pressure cylinder 1 is not shown in the figure. The first pipe orifice 314 and the second pipe orifice 315 are respectively used for injecting water into and exhausting air from the seawater tank 31 to ensure that the seawater tank 31 is filled with seawater under the test state.

[0057] The test object 2 is a deep-sea equipment model or a certain component of the deep-sea equipment. The pressure cylinder system includes a pressure cylinder 1 and a pressure addition and relief system 4. The working medium in the pressure cylinder 1 is fresh water. The pressure addition and relief system 4 generally includes high-pressure-resistant pipelines, a water storage tank, and an accumulator or a water pump that provides high pressure. To simulate the pressure environment of the deep sea, the pressure that the pressure addition and relief system 4 can reach usually needs to reach more than 100 MPa. The pressure addition and relief system 4 is a technology well-known to those skilled in the art, and the present invention will not elaborate in detail.

[0058] In the deep-sea environment simulation device of the present invention, an auxiliary device 3 for loading the test object 2 is arranged inside the pressure cylinder 1. The auxiliary device 3 includes a seawater tank 31, a support 33 located inside the seawater tank 31, and a base 32 located outside the seawater tank 31. The whole auxiliary device 3 can enter and exit from the orifice of the pressure cylinder 1 and is fixedly installed inside the pressure cylinder 1.

[0059] During the test, the test object 2 is inside the sealed seawater tank 31. The pressure inside the pressure cylinder 1 will be transmitted to the inside of the seawater tank 31 by squeezing the deformation part 310 to ensure the pressure balance inside and outside the seawater tank 31, and realize the coupling environment simulation of the seawater pressure and the corrosion environment for the test object 2. Since the medium in the seawater tank 31 is seawater and the working medium in the pressure cylinder 1 is still fresh water, when the deep-sea environment simulation device of the present invention is used for the test, it will not cause adverse effects such as corrosion to the relevant pipeline systems of the pressure cylinder 1 and the pressure addition and relief system 4, and reduces the equipment investment.

[0060] The seawater tank 31 provides a partial seawater environment for the test object 2 in a fresh water environment. By means of the deformation part 310 on the side wall of the seawater tank 31, the pressures of the fresh water environment and the seawater environment are ensured to be the same, so as to realize the indirect pressurization of seawater by the pressure addition and relief system 4, couple the seawater pressure environment with the corrosion environment. By using the original pressure cylinder system for pressurization, the requirements of both the pressure environment and the corrosion environment can be satisfied simultaneously. It is only necessary to design and manufacture the auxiliary device 3 according to different test conditions and test object 2, so as to realize the synchronous test of the pressure resistance, sealing and other performances and the corrosion resistance of deep-sea equipment, reduce the test investment and shorten the test cycle.

[0061] The deep-sea environment simulation device of the present invention is simple and practical. On the basis of using the existing pressure cylinder system, it can realize the coupled simulation of seawater pressure and corrosion environment, and provide technical method support for the accurate performance tests such as the fatigue of the pressure-resistant structure and the long-term sealing performance of deep-sea equipment.

[0062] The volume change amount ΔV of the seawater tank 31 that can be provided by the deformation of the deformation part 310 s needs to satisfy:

[0063] ΔV s ≥k h P T V 0c ,

[0064] wherein, k h is the compressibility of seawater, m 2 / N; P T is the difference between the target test pressure and the atmospheric pressure, MPa; V 0c is the volume of seawater filled in the seawater tank 31 under the atmospheric pressure state, m 3 .`

[0065] The multiple deformation parts 310 can be multiple elastic diaphragms installed on the side wall of the seawater tank 31, or other elastic components that can provide deformation.

[0066] In an exemplary embodiment, as Figure 1 , Figure 2 , Figure 5 shown, the deformation part 310 is a variable volume cavity. An interface 3101 is arranged on one side of the deformation part 310. The interface 3101 is connected to the seawater tank 31, so that the inner cavity of the deformation part 310 is communicated with the inside of the seawater tank 31.

[0067] In this embodiment, a connecting pipe 311 is arranged on the seawater tank 31. The interface 3101 is connected to the connecting pipe 311 through a clamp 3102. A flange 316 for installing a hatch cover 313 is arranged at the hatch of the seawater tank 31. A sealing ring 317 is arranged between the flange 316 and the hatch cover 313. The flange 316 is connected to the hatch cover 313 through fasteners. A support 33 is arranged at the bottom of the seawater tank 31.

[0068] As shown Figures 2 - 4 in the figure, the deformation part 310 is installed at the bottom of the seawater tank 31.

[0069] The base 32 of the seawater tank 31 includes a bottom plate 322 and a support column 321 connecting the bottom plate 322 and the bottom of the seawater tank 31. The support column 321 spaces the bottom plate 322 and the seawater tank 31 by a certain distance, serving as a space for arranging the deformation part 310. The interface 3101 faces upward and is connected to the connecting pipe 311 located at the bottom of the seawater tank 31.

[0070] Placing the deformation part 310 of the cavity structure at the bottom of the seawater tank 31 is convenient for installation and disassembly, and is conducive to protecting the deformation part 310 of the cavity structure from unnecessary rubbing and scratching; in addition, since the deformation part 310 is at the bottom, when seawater is injected into the seawater tank 31, the deformation part 310 can be effectively filled with liquid and air can be discharged in the first time.

[0071] The deformation part 310 of the cavity structure is connected to the seawater tank 31 through the interface 3101, which is convenient for replacing the deformation part 310 with different volumes, enabling the volume of the deformation part 310 to adapt to the target test pressure, and facilitating the adjustment and design of the volume change of the seawater tank 31.

[0072] As shown Figure 5 in the figure, the deformation part 310 is spherical, and the material of the deformation part 310 is rubber.

[0073] The spherical deformation part 310 can be called a bladder ball, and the rubber material can specifically be nitrile rubber or fluororubber. The size and quantity of the deformation part 310 are configured according to specific pressure change requirements. As shown Figure 4 in the figure, the number of connecting pipes 311 at the bottom of the seawater tank 31 is four, and the corresponding spherical deformation parts 310 are four. The volume change ΔV of the seawater tank 31 s is the sum of the deformation amounts of all the deformation parts 310.

[0074] Taking the deformation part 310 of the cavity structure as an example, the relationship between the volume change ΔV of the seawater tank 31 that can be provided by the deformation of the deformation part 310 s and the selection of the deformation part 310 is explained as follows:

[0075] The volume of the spherical inner cavity of the deformation part 310 determines the upper limit of the water pressure it can transmit, and the specification size of the deformation part 310 can be determined according to the test pressure requirements;

[0076] The relationship between the known liquid pressure change amount Δp and the liquid volume change amount ΔV is:

[0077]

[0078] In the above formula: k is the compressibility of the liquid, m2 / N, where the compressibility of seawater is about 0.0485 m 2 / N; Δp is the change in liquid pressure, MPa; V0 is the volume of the liquid-filled closed device under atmospheric pressure, m 3 ; ΔV is the change in liquid volume, m 3 .

[0079] When the liquid pressure increases, Δp > 0, and the liquid volume is compressed, ΔV < 0.

[0080] When the maximum required pressure change for the test is Δp max = P T , the volume that the deformation part 310 (bladder ball) can provide for deformation scaling is ΔV s , ΔV s should not be less than k h P T V 0c , where k h is the compressibility of seawater, m 2 / N; P T is the difference between the target test pressure and atmospheric pressure, MPa; V 0c is the volume of seawater filled in the seawater tank 31 under atmospheric pressure, m 3 .

[0081] Therefore, based on the volume of the deformation part 310 and the compression change of seawater under water pressure, the maximum pressure transmitted by the deformation part 310 through deformation can be estimated, that is, the maximum pressure required for the test can be adjusted by adjusting the volume of the deformation part 310.

[0082] In an exemplary embodiment, as Figure 2 、 Figure 3 shown, the side wall of the seawater tank 31 is provided with a first through-hull member 312, and the side wall of the pressure cylinder 1 is provided with a second through-hull member. The first through-hull member 312 and the second through-hull member correspond to each other and are used to pass and connect the cables of the test object 2.

[0083] In this embodiment, the cable can be used for communication or testing; when it is necessary to continuously monitor the state of the test object 2 in seawater under a certain pressure, the sensor located on the test object 2 is connected to the testing instrument through the cable; in the case where the test object 2 needs to be controlled by an external test system, the cable connects the control system of the test object 2 and the test system.

[0084] In an exemplary embodiment, the present application provides a method for testing the performance of deep-sea equipment, including the following steps:

[0085] Place the test object 2 in a closed seawater tank 31 containing seawater;

[0086] Place the seawater tank 31 inside the pressure cylinder 1 containing fresh water. On both sides of the deformation part 310 on the wall of the seawater tank 31 are seawater and fresh water respectively;

[0087] Use the pressure addition and relief system 4 to pressurize the fresh water in the pressure cylinder 1, causing the deformation part 310 to deform and increasing the pressure of the seawater in the seawater tank 31;

[0088] When the pressure of the seawater in the seawater tank 31 reaches the target test pressure, conduct the test.

[0089] After the test is completed, use the pressure addition and relief system 4 to relieve the pressure of the fresh water in the pressure cylinder 1. The deformation part 310 deforms in the reverse direction, reducing the pressure of the seawater in the seawater tank 31.

[0090] Place the test object 2 inside the deformable and airtight seawater tank 31, immerse the seawater tank 31 in a fresh water environment, and use the existing pressure cylinder system 1 to provide a high-pressure environment for the seawater tank 31. While the seawater tank 31 provides a corrosion environment for the test object 2, the internal and external media of the seawater tank 31 are both in a high-pressure state, coupling the seawater pressure environment and the corrosion environment to achieve synchronous testing of the pressure resistance, sealing and other performances and anti-corrosion performance of deep-sea equipment.

[0091] In another exemplary embodiment, the present application provides a method for testing the performance of deep-sea equipment. Using the deep-sea environment simulation device in the above embodiment, the method includes the following steps:

[0092] First, select the auxiliary device 3 with a size specification adapted to the test object 2, and estimate the volume change amount ΔV of the seawater tank 31 that can be provided by the deformation of the deformation part 310 according to the target test pressure s , when the deformation part 310 is spherical, estimate whether the volume of the deformation part 310 meets the test requirements. If not, replace the deformation part 310 with a larger volume. Connect the interface 3101 of the deformation part 310 to the nozzle 311 at the bottom of the seawater tank 31 and lock and fix it with a clamp 3102.

[0093] Then, place the test object 2 inside the seawater tank 31 and use the support 33 inside the seawater tank 31 to fix the test object 2. Install a sealing ring 317 on the flange 316 at the hatch of the seawater tank 31, cover the hatch cover 313, and tighten and fix it with fasteners. Inject seawater into the seawater tank 31 through the first nozzle 314, and at the same time exhaust air through the second nozzle 315. After the seawater tank 31 is filled with seawater, seal and block the first nozzle 314 and the second nozzle 315 with plugs.

[0094] Then, lift the entire auxiliary device 3 into the pressure cylinder 1, cover the cylinder cover of the pressure cylinder 1, and inject fresh water into the pressure cylinder 1.

[0095] The fresh water in the pressure cylinder 1 is pressurized by the pressure addition and relief system 4, causing the deformation part 310 to deform, and the pressure of the seawater in the seawater tank 31 increases;

[0096] When the pressure of the seawater in the seawater tank 31 reaches the target test pressure, the test is carried out.

[0097] After the test is completed, the fresh water in the pressure cylinder 1 is depressurized by the pressure addition and relief system 4, and the deformation part 310 deforms in the reverse direction, reducing the pressure of the seawater in the seawater tank 31.

[0098] If there is no need to conduct the test again, after the pressure in the pressure cylinder 1 returns to normal pressure, the seawater in the pressure cylinder 1 is discharged, the auxiliary device 3 is lifted out of the pressure cylinder 1 as a whole, and then the test object 2 is taken out from the seawater tank 31.

[0099] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention can be seen in the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A deep sea environment simulation device, characterized in that: include: A pressure cylinder (1) for containing fresh water; A pressure relief system (4) is connected to the pressure cylinder (1); A seawater tank (31) is arranged inside the pressure cylinder (1), the seawater tank (31) is used to place the test object (2) and contain seawater, and a deformation portion (310) is arranged on the wall of the seawater tank (31); When the pressure-adding and depressurizing system (4) pressurizes the fresh water in the pressure cylinder (1), the fresh water applies pressure to the deformation portion (310), causing the deformation portion (310) to deform, thereby increasing the pressure of the seawater in the seawater tank (31); and when the pressure-adding and depressurizing system (4) depressurizes the fresh water in the pressure cylinder (1), the deformation portion (310) deforms in the opposite direction, thereby reducing the pressure of the seawater in the seawater tank (31).

2. The deep sea environment simulation device according to claim 1, characterized in that: The seawater tank (31) comprises a hatch cover (313) sealed and installed on the hatch of the seawater tank (31). A support (33) is arranged in the seawater tank (31), and the support (33) is used to fix and place the test object (2).

3. The deep sea environment simulation device according to claim 2, characterized in that: It also comprises a first pipe opening (314) and a second pipe opening (315) communicating with the inside and outside of the seawater tank (31), and sealing plugs are installed at both the first pipe opening (314) and the second pipe opening (315).

4. The deep sea environment simulation device according to claim 1, characterized in that: The deformation of the deformation portion (310) can provide a volume change ΔV of the seawater tank (31) s Need to meet: ΔV s ≥k h P T V 0c , Among them, k h is the compressibility of seawater, m 2 / N; =P T V is the difference between the target test pressure and normal pressure, MPa; 0c is the volume of seawater filled in the seawater tank (31) under normal pressure, m 3 .

5. The deep sea environment simulation device according to claim 1, characterized in that: The deformation portion (310) is a variable volume cavity. An interface (3101) is provided on one side of the deformation portion (310). The interface (3101) is connected to the seawater tank (31), so that the inner cavity of the deformation portion (310) is in communication with the interior of the seawater tank (31).

6. The deep sea environment simulation device according to claim 5, characterized in that: The deformation portion (310) is installed at the bottom of the seawater tank (31).

7. The deep sea environment simulation device according to claim 5, characterized in that: The deformation portion (310) is spherical, and the material of the deformation portion (310) is rubber.

8. The deep sea environment simulation device according to claim 1, characterized in that: The side wall of the seawater tank (31) is provided with a first penetration piece (312), and the side wall of the pressure cylinder (1) is provided with a second penetration piece, the first penetration piece (312) and the second penetration piece correspond to each other and are used for passing a cable connected to the test object (2).

9. A deep-sea equipment performance test method, characterized in that: The following steps are involved: Placing the test object (2) in a sealed seawater tank (31) containing seawater; The seawater tank (31) is placed in a pressure cylinder (1) containing fresh water, and the two sides of the deformed portion (310) on the wall of the seawater tank (31) are the seawater and the fresh water respectively; The pressure-adding and depressurizing system (4) is used to pressurize the fresh water in the pressure cylinder (1), so that the deformation portion (310) is deformed and the pressure of the seawater in the seawater tank (31) is increased; When the pressure of the seawater in the seawater tank (31) reaches the target test pressure, the test is performed.

10. The deep-sea equipment performance test method according to claim 9, characterized in that: After the test is completed, the pressure relief system (4) is used to relieve the pressure of the fresh water in the pressure cylinder (1), and the deformation portion (310) is deformed in the reverse direction, thereby reducing the pressure of the seawater in the seawater tank (31).

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