Negative pressure back plate type anti-corrosion device and control method thereof

Abstract

The invention discloses a negative pressure back plate type anti-corrosion device and a control method thereof, the negative pressure back plate type anti-corrosion device comprises a pressure vessel main body and a pressure control system, an anti-corrosion and anti-rust layer is lined in an inner cavity of the pressure vessel main body, and the joint of the anti-corrosion and anti-rust layer and the pressure vessel main body is fixed by full welding; a gap cavity is formed between the anti-corrosion and anti-rust layer and the pressure vessel main body; the pressure control system controls the pressure difference value of the gap cavity to be smaller than-0.08 MPa. The control method of the device comprises the steps that when the closed pressure container works, the pressure of the gap cavity is kept under the negative pressure condition through the pressure control system, and the range of the negative pressure is smaller than-0.08 MPa. The balance state is achieved by keeping negative pressure on the back face of the anti-corrosion and anti-rust layer, the anti-corrosion and anti-rust effects are achieved, the overall structure is simple, the machining process is convenient, and the manufacturing cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel anti-corrosion, and in particular to a negative pressure back plate type anti-corrosion device and a control method thereof. Background Art

[0002] In the use of pressure vessels, when positive and negative pressures are alternating, and the inner cavity is filled with corrosive gases, stainless steel is generally used to make the container; however, this method has high manufacturing costs and complex processing techniques. The patent number is: 2020225166070, which discloses an anti-corrosion structure for the inner wall of a pressure vessel, including a pressure vessel body, the interior of the pressure vessel body is hollow, a wire mesh layer is laid on the inner wall of the pressure vessel body, an anti-corrosion layer is laid on the side of the wire mesh layer away from the pressure vessel body, the wire mesh layer is welded to the pressure vessel body, a plurality of circumferentially evenly distributed magnets and anti-detachment fastening mechanisms are provided on the inner wall of the pressure vessel body, the magnets and the anti-detachment fastening mechanisms are spaced apart, a pair of support seats are connected to the pressure vessel body for supporting the pressure vessel body, and the anti-detachment fastening mechanism includes an insertion rod for fixing the wire mesh layer. The utility model makes the anti-corrosion layer not easy to fall off by setting a corresponding structure in the pressure vessel, thereby improving the pressure The anti-corrosion effect of the container makes the pressure vessel less likely to be damaged by corrosion, thereby increasing the service life of the pressure vessel and reducing the economic loss of the user to a certain extent. However, there are disadvantages such as complex anti-corrosion structure and high manufacturing cost.

[0003] Therefore, there is still room for improvement in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a negative pressure back plate type anti-corrosion device and a control method thereof, aiming to solve the technical problems of high manufacturing cost and complex processing technology of closed pressure vessels.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a negative pressure backplate anti-corrosion device, which particularly includes a pressure vessel body and a pressure control system, the inner cavity of the pressure vessel body is lined with an anti-corrosion and anti-rust layer, and the joint between the anti-corrosion and anti-rust layer and the pressure vessel body is fully welded and fixed; there is also a gap cavity between the anti-corrosion and anti-rust layer and the pressure vessel body; the pressure control system controls the pressure of the gap cavity to be less than -0.08MPa.

[0006] The negative pressure back plate type anti-corrosion device, wherein the anti-corrosion and anti-rust layer is a stainless steel plate.

[0007] The negative pressure back plate type anti-corrosion device, wherein the inner layer of the anti-corrosion and anti-rust layer forms a working chamber.

[0008] The negative pressure backplate anti-corrosion device, wherein the pressure control system includes a working positive pressure source for filling pressure into the working chamber, a working negative pressure source for pumping negative pressure into the working chamber, a pre-negative pressure source for presetting negative pressure in the gap chamber, a first switch valve, a second switch valve, and a third switch valve for controlling the gas flow, a first pressure gauge, a second pressure gauge, and an electronic control device for measuring the pressure difference in the gap chamber; the first pressure gauge is connected to the gap chamber; the working positive pressure source is connected to the working chamber through the first switch valve, and the working negative pressure source is connected to the working chamber through the second switch valve; the working negative pressure source is connected to the gap chamber through the third switch valve; the second pressure gauge is connected to the gap chamber; the electronic control device is used to receive signals from the first pressure gauge and the second pressure gauge, and control the working positive pressure source, the working negative pressure source, the first switch valve, the second switch valve, and the third switch valve.

[0009] The negative pressure backplate anti-corrosion device, wherein the working chamber is provided with a working chamber pressurization port and a working chamber pressure extraction port, and the gap chamber is provided with a gap chamber pressure extraction port and a gap chamber pressure measuring port; the working chamber pressurization port is connected to the first switch valve through an air pipe; the working chamber pressure extraction port is connected to the second switch valve through an air pipe, and the gap chamber pressure measuring port is connected to the first pressure gauge; the gap chamber pressure extraction port is connected to the third switch valve through an air pipe.

[0010] The negative pressure back plate type anti-corrosion device is characterized in that a stainless steel sleeve is welded at the position where the hole is punched in the pressure vessel body, and the joint between the anti-corrosion and anti-rust layer and the stainless steel sleeve is fully welded together.

[0011] A control method for a negative pressure back plate type anti-corrosion device is characterized in that, when a closed pressure vessel is started, the void cavity of the closed pressure vessel is evacuated to a set negative pressure in the void cavity through a pre-negative pressure source of a pressure control system; the set negative pressure is less than -0.08MPa; and at the same time, when the closed pressure vessel is working, the negative pressure in the void cavity of the closed container is maintained.

[0012] The control method of the negative pressure back plate type anti-corrosion device, wherein the pre-negative pressure source of the pressure control system evacuates the airtight pressure container to a negative pressure set in the airtight pressure cavity; the specific operation is as follows: S1: First, vacuum the airtight pressure vessel to form negative pressure; S2: The first pressure gauge feeds back the detected pressure value of the void cavity to the electronic control device; the electronic control device controls the pre-negative pressure source to extract the gas from the void cavity until the set negative pressure is reached.

[0013] In the control method of the negative pressure back plate anti-corrosion device, the maximum pressure difference between the working chamber and the void chamber is 20 KPa.

[0014] The control method of the negative pressure backplate anti-corrosion device is as follows: when the closed pressure container is working, the electronic control device controls the working positive pressure source to inflate the working chamber to achieve the regulated positive pressure, and controls the working negative pressure source to evacuate the working chamber to achieve the regulated negative pressure.

[0015] Beneficial effect: The present invention achieves a balanced state by maintaining negative pressure on the back of the anti-corrosion and anti-rust layer, and plays an anti-corrosion and anti-rust effect. It not only has a simple overall structure and convenient processing technology, but also has low manufacturing cost. By welding a layer of anti-corrosion and anti-rust layer inside the pressure vessel body, the anti-corrosion and anti-rust effect can be achieved when working in the closed pressure vessel cavity. When the working cavity requires positive pressure, the anti-corrosion and anti-rust layer is still tightly attached to the pressure vessel body under the positive pressure and is supported by the pressure vessel body. Since the gap between the void cavity and the pressure vessel body is extremely small, the maximum deformation is the void deformation, and the deformation cost can be ignored. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of an embodiment of the present invention.

[0017] In the figure: 1. pressure vessel body; 2. anti-corrosion and anti-rust layer 2; 3. void cavity; 4. working cavity; 5. working positive pressure source; 6. working negative pressure source; 7. first pressure gauge; 8. first switch valve; 9. second switch valve 9; 10. third switch valve; 11. second pressure gauge; 12. electronic control device; 13. pre-negative pressure source; 15. working cavity pressurization port; 16. working cavity pressure extraction port; 17. void cavity pressure extraction port; 18. void cavity pressure measuring port; 19. stainless steel sleeve. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clear and explicit, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0019] like Figure 1As shown, the present invention discloses a negative pressure backplate anti-corrosion device, which particularly includes a pressure vessel body 1 and a pressure control system. The inner cavity of the pressure vessel body 1 is lined with an anti-corrosion and anti-rust layer 2, and the joint between the anti-corrosion and anti-rust layer 2 and the pressure vessel body 1 is fully welded and fixed; there is also a gap cavity 3 between the anti-corrosion and anti-rust layer 2 and the pressure vessel body; the pressure control system controls the pressure of the gap cavity 3 to be less than -0.08MPa. The pressure control system includes a working positive pressure source 5 for filling pressure into the working chamber 4, a working negative pressure source 6 for pumping negative pressure into the working chamber 4, a pre-negative pressure source 13 for presetting the negative pressure in the gap chamber 3, a first switch valve 8, a second switch valve 9, and a third switch valve 10 for controlling the gas flow, a first pressure gauge 7, a second pressure gauge 11, and an electronic control device 12 for measuring the pressure difference of the gap chamber 3; the first pressure gauge 7 is connected to the gap chamber 3; the working positive pressure source 5 is connected to the working chamber 4 through the first switch valve 8, and the working negative pressure source 6 is connected to the working chamber 4 through the second switch valve 9; the working negative pressure source 6 is connected to the gap chamber 3 through the third switch valve 10; the second pressure gauge 11 is connected to the gap chamber 3; the electronic control device 12 is used to receive signals from the first pressure gauge 7 and the second pressure gauge 11, and control the working positive pressure source 5, the working negative pressure source 6, the first switch valve 8, the second switch valve 9, and the third switch valve 10.

[0020] After adopting the above structure, the present invention welds a layer of anti-corrosion and anti-rust layer in the pressure vessel body, so that the closed pressure vessel cavity can achieve the effect of anti-corrosion and anti-rust when working; at the same time, when the anti-corrosion and anti-rust layer fails, it will not cause damage to the working battery cell, and the first pressure gauge is added, which is equivalent to adding a layer of safety protection mechanism. The manufacturing cost of the present invention is lower than that of the existing closed pressure vessel, and the processing technology is simple and the safety is better.

[0021] Preferably, the anti-corrosion and anti-rust layer 2 is a stainless steel plate; therefore, the anti-corrosion and anti-rust effect on the pressure vessel body can be achieved, and the manufacturing cost is low.

[0022] The negative pressure back plate type anti-corrosion device, wherein the inner layer of the anti-corrosion and anti-rust layer 2 forms a working chamber 4.

[0023] Specifically, the working chamber 4 is provided with a working chamber pressurization port 15 and a working chamber pressure relief port 16, and the gap chamber 3 is provided with a gap chamber pressure relief port 17 and a gap chamber pressure measuring port 18; the working chamber pressurization port 15 is connected to the first switch valve 8 through an air pipe; the working chamber pressure relief port 16 is connected to the second switch valve 9 through an air pipe, and the gap chamber pressure measuring port 18 is connected to the first pressure gauge 7; the gap chamber pressure relief port 17 is connected to the third switch valve 10 through an air pipe.

[0024] Preferably, a stainless steel sleeve 19 is welded at the position where the pressure vessel body 1 is punched, and the joint between the anti-corrosion and anti-rust layer 2 and the stainless steel sleeve 19 is fully welded together.

[0025] The present invention discloses a control method for a negative pressure back plate type anti-corrosion device. When a closed pressure container is started, a pre-negative pressure source 13 of a pressure control system is used to evacuate a void cavity 3 of the closed pressure container to a negative pressure set in the void cavity 3; the set negative pressure is less than -0.08MPa; at the same time, when the closed pressure container is working, the negative pressure in the void cavity 3 of the closed container is maintained.

[0026] Specifically, the pre-negative pressure source 13 of the pressure control system evacuates the airtight pressure container cavity 3 to a negative pressure set in the cavity 3; the specific operation is as follows: S1: firstly evacuate the airtight pressure container cavity 3 to form negative pressure; S2: The first pressure gauge 7 feeds back the detected pressure value of the void cavity 3 to the electronic control device 12; the electronic control device 12 controls the pre-negative pressure source 13 to extract the gas from the void cavity 3 until the set negative pressure is reached.

[0027] Specifically, the maximum pressure difference between the working chamber 4 and the gap chamber 3 is 20 KPa.

[0028] The control method of the negative pressure backplate anti-corrosion device is as follows: when the closed pressure container is working, the electronic control device 12 controls the working positive pressure source 5 to inflate the working chamber 4 to achieve the regulated positive pressure, and controls the working negative pressure source 6 to evacuate the working chamber 4 to achieve the regulated negative pressure.

[0029] The present invention achieves a balanced state by maintaining negative pressure on the back of the anti-corrosion and anti-rust layer, and has an anti-corrosion and anti-rust effect. Not only is the overall structure simple, the processing technology is convenient, and the manufacturing cost is low. By welding an anti-corrosion and anti-rust layer in the pressure vessel body, the anti-corrosion and anti-rust effect can be achieved in the closed pressure vessel cavity when working. When the working cavity requires positive pressure, the anti-corrosion and anti-rust layer is still closely attached to the pressure vessel body under positive pressure and supported by the pressure vessel body. Since the gap between the void cavity and the pressure vessel body is extremely small, the maximum deformation is the void deformation, and the deformation cost can be ignored. .

[0030] The above are only preferred implementation modes of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. It should be pointed out that for technicians in this technical field, any modification or equivalent replacement of the technical solution of the present invention without creative work does not depart from the protection scope of the technical solution of the present invention.

Claims

1. A negative pressure back plate anti-corrosion device, characterized in that: The invention comprises a pressure vessel body (1) and a pressure control system. The inner cavity of the pressure vessel body (1) is lined with an anti-corrosion and anti-rust layer (2). The anti-corrosion and anti-rust layer (2) and the pressure vessel body (1) are fully welded at the joint. There is also a void cavity (3) between the anti-corrosion and anti-rust layer (2) and the pressure vessel body. The pressure control system controls the pressure of the void cavity (3) to be less than -0.08 MPa.

2. The negative pressure back plate anti-corrosion device according to claim 1, characterized in that: The anti-corrosion and anti-rust layer (2) is a stainless steel plate.

3. The negative pressure back plate anti-corrosion device according to claim 2, characterized in that: The inner layer of the anti-corrosion and anti-rust layer (2) forms a working cavity (4).

4. The negative pressure back plate type anti-corrosion device according to claim 3, characterized in that: The pressure control system comprises a working positive pressure source (5) for filling the working chamber (4) with pressure, a working negative pressure source (6) for pumping negative pressure into the working chamber (4), a pre-negative pressure source (13) for presetting the negative pressure in the interstitial chamber (3), a first switch valve (8), a second switch valve (9), and a third switch valve (10) for controlling the gas flow, a first pressure gauge (7), a second pressure gauge (11), and an electronic control device (12) for measuring the pressure difference of the interstitial chamber (3); the first pressure gauge (7) is connected to the interstitial chamber (3); the working positive pressure source ( 5) is connected to the working chamber (4) through the first switch valve (8); the working negative pressure source (6) is connected to the working chamber (4) through the second switch valve (9); the working negative pressure source (6) is connected to the gap chamber (3) through the third switch valve (10); the second pressure gauge (11) is connected to the gap chamber (3); the electronic control device (12) is used to receive signals from the first pressure gauge (7) and the second pressure gauge (11), and control the working positive pressure source (5), the working negative pressure source (6), the first switch valve (8), the second switch valve (9) and the third switch valve (10).

5. The negative pressure back plate type anti-corrosion device according to claim 4, characterized in that: The working chamber (4) is provided with a working chamber pressurization port (15) and a working chamber pressure extraction port (16), and the interstitial chamber (3) is provided with an interstitial chamber pressure extraction port (17) and an interstitial chamber pressure measuring port (18); the working chamber pressurization port (15) is connected to a first switch valve (8) via an air pipe; the working chamber pressure extraction port (16) is connected to a second switch valve (9) via an air pipe, and the interstitial chamber pressure measuring port (18) is connected to a first pressure gauge (7); and the interstitial chamber pressure extraction port (17) is connected to a third switch valve (10) via an air pipe.

6. The negative pressure back plate type anti-corrosion device according to claim 5, characterized in that: A stainless steel sleeve (19) is welded at the location where the pressure vessel body (1) is punched, and the anti-corrosion and anti-rust layer (2) and the stainless steel sleeve (19) are fully welded together at the joint.

7. A control method using the negative pressure back plate type anti-corrosion device according to any one of claims 3 to 6, characterized in that: When the closed pressure container is started, the closed pressure container void cavity (3) is evacuated to a set negative pressure of the void cavity (3) through the pre-negative pressure source (13) of the pressure control system; the set negative pressure is less than -0.08 MPa; at the same time, when the closed pressure container is working, the negative pressure of the closed container void cavity (3) is maintained.

8. The control method of the negative pressure back plate type anti-corrosion device according to claim 7, characterized in that: The pre-negative pressure source (13) of the pressure control system is used to evacuate the airtight pressure container cavity (3) to a negative pressure set in the cavity (3); the specific operation is as follows: S1: firstly, vacuum is drawn into the airtight pressure container cavity (3) to form negative pressure; S2: The first pressure gauge (7) feeds back the detected pressure value of the void cavity (3) to the electronic control device (12); the electronic control device (12) controls the pre-negative pressure source (13) to extract gas from the void cavity (3) until the negative pressure reaches a set value.

9. The control method of the negative pressure back plate type anti-corrosion device according to claim 8, characterized in that: The maximum pressure difference between the working chamber (4) and the void chamber (3) is 20 KPa.

10. The control method of the negative pressure back plate type anti-corrosion device according to claim 8, characterized in that: When the sealed pressure container is working, the electronic control device (12) controls the working positive pressure source (5) to inflate the working chamber (4) to achieve a regulated positive pressure, and controls the working negative pressure source (6) to evacuate the working chamber (4) to achieve a regulated negative pressure.

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