Back pressure type anti-corrosion device for closed pressure container

Abstract

The utility model discloses a back pressure type anti-corrosion device of a closed pressure vessel, which comprises a pressure vessel main body, an anti-corrosion and anti-corrosion film structure and a pressure control system, and the pressure vessel main body is divided into a working cavity and a balance cavity by the anti-corrosion and anti-corrosion film structure; the pressure control system controls the pressure difference value between the working cavity and the balance cavity to be not larger than 10 KPa. The pressure control system comprises an air pressure source, a first flow control valve, a second flow control valve, a third flow control valve, a pressure difference sensor and an electric control device, wherein the first flow control valve, the second flow control valve and the third flow control valve are used for controlling air flow; the differential pressure sensor is connected with the working cavity and the balance cavity. The air pressure source is communicated with the working cavity through a first flow control valve and is communicated with the balance cavity through a second flow control valve; the electric control device is used for receiving signals of the differential pressure sensor and controlling the air pressure source, the first flow control valve, the second flow control valve and the third flow control valve.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure vessel anticorrosion technical field especially a kind of back pressure type anticorrosion device of closed pressure vessel. BACKGROUND

[0002] In the use of pressure vessel, when involving positive and negative pressure alternate working condition, and its inner cavity is filled with corrosive gas, generally adopt stainless steel material to manufacture container;But the way manufacturing cost is high, processing technique is complex.

[0003] Therefore, the prior art is yet to be improved. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of back pressure type anticorrosion device of closed pressure vessel, to solve the technical problem that closed pressure vessel manufacturing cost is high, processing technique is complex.

[0005] To realize the above-mentioned purpose, the technical scheme of the utility model is as follows: a kind of back pressure type anticorrosion device of closed pressure vessel, it includes: pressure vessel main body, anticorrosion corrosion-resistant membrane structure and pressure control system, the anticorrosion corrosion-resistant membrane structure divides pressure vessel main body into working cavity and balance cavity;The pressure control system controls the pressure difference between working cavity and balance cavity not more than 10KPa.

[0006] The back pressure type anticorrosion device of closed pressure vessel, wherein, the anticorrosion corrosion-resistant membrane structure is stainless steel plate membrane structure or Teflon rubber membrane structure.

[0007] The back pressure type anticorrosion device of closed pressure vessel, wherein, the pressure control system includes the gas pressure source for filling pressure to working cavity and balance cavity, first flow control valve, second flow control valve, third flow control valve for controlling gas flow, pressure difference sensor for measuring the pressure difference between working cavity and balance cavity and electric control device;The pressure difference sensor is connected working cavity and balance cavity respectively;The gas pressure source is communicated working cavity by first flow control valve, and the gas pressure source is communicated balance cavity by second flow control valve;The electric control device is used to receive the signal of pressure difference sensor, and controls gas pressure source, first flow control valve, second flow control valve, third flow control valve.

[0008] The back pressure type anticorrosion device of the closed pressure container, wherein the working cavity is provided with a working cavity pressurizing port and a working cavity pressure measuring port, the balance cavity is provided with a balance cavity pressurizing port and a balance cavity pressure measuring port; the working cavity pressurizing port is connected with the first flow control valve through an air pipe, and the working cavity pressure measuring port is connected with the differential pressure sensor; the balance cavity pressurizing port is connected with the second flow control valve through an air pipe, and the balance cavity pressure measuring port is connected with the differential pressure sensor; the balance cavity is further provided with a pressure relief port, the pressure relief port is connected with the third flow control valve, and the first flow control valve, the second flow control valve and the third flow control valve are connected with the electric control device.

[0009] The back pressure type anticorrosion device of the closed pressure container, wherein the differential pressure sensor is a differential pressure gauge.

[0010] The back pressure type anticorrosion device of the closed pressure container, wherein the number of the air pressure sources is one, and the air pressure source is further connected with a filter for filtration.

[0011] The back pressure type anticorrosion device of the closed pressure container, wherein the number of the air pressure sources is two, the two air pressure sources are respectively a working air source and a back pressure air source, the working air source is communicated with the working cavity through the first flow control valve, and the back pressure air source is communicated with the balance cavity through the second flow control valve.

[0012] A control method of a back pressure type anticorrosion device of a closed pressure container, wherein the control method comprises the following steps:

[0013] S1: when the closed pressure container is started to work, the air pressure source simultaneously charges the working cavity and the balance cavity of the closed pressure container to a working cavity set working pressure value;

[0014] S11: first, the working cavity of the closed pressure container is charged with positive pressure gas or vacuumized to form negative pressure, and the balance cavity is also charged with gas or vacuumized to form negative pressure;

[0015] S12: the differential pressure sensor feeds back the pressure difference value between the working cavity and the balance cavity detected to the electric control device, and the electric control device judges and controls the pressure difference value to be not greater than 10 KPa;

[0016] S13: when the pressure of the working cavity of the closed pressure container reaches the set pressure value, the charging of the working cavity and the balance cavity is stopped;

[0017] S2: when the closed pressure container works, the working cavity and the balance cavity of the closed container are pressure maintained;

[0018] S21: when the pressure of the working cavity of the closed pressure container is at the set pressure value, the electric control device controls the air pressure source to be static;

[0019] S22: The differential pressure sensor feeds back the detected pressure difference between the working chamber and the balance chamber to the electric control device, which judges and controls the pressure difference to be no more than 10 KPa.

[0020] The control method of the back pressure type corrosion prevention device of the closed pressure vessel, wherein how to ensure the pressure difference between the working chamber and the balance chamber during the working chamber pressure charging process in step S12:

[0021] S121: When the pressure difference of the differential pressure sensor is no more than 10 KPa, the electric control device controls the air pressure source to simultaneously charge the working chamber and the balance chamber, so that the pressure difference between the working chamber and the balance chamber is kept no more than 10 KPa.

[0022] S122: When the pressure difference of the differential pressure sensor is more than 10 KPa; based on the pressure of the working chamber of the closed pressure vessel, when the pressure of the balance chamber is less than that of the working chamber, the electric control device controls the air pressure source to charge the working chamber and the balance chamber, and increases the charging amount of the balance chamber, so that the pressure difference is no more than 10 KPa; based on the pressure of the working chamber of the closed pressure vessel, when the pressure of the balance chamber is greater than that of the working chamber, the electric control device controls the air pressure source to charge the working chamber and the balance chamber, and reduces the charging amount of the balance chamber, so that the pressure difference is no more than 10 KPa.

[0023] The control method of the back pressure type corrosion prevention device of the closed pressure vessel, wherein how to ensure the pressure difference between the working chamber and the balance chamber during the working chamber pressure maintaining process in step S22:

[0024] S211: When the pressure difference of the differential pressure sensor is no more than 10 KPa, the electric control device controls the air pressure source to keep static and not charge;

[0025] S212: When the pressure difference of the differential pressure sensor is more than 10 KPa; based on the pressure of the working chamber of the closed pressure vessel, when the pressure of the balance chamber is less than that of the working chamber, the electric control device controls the charging amount of the balance chamber of the air pressure source at this time, so that the pressure difference is no more than 10 KPa; based on the pressure of the working chamber of the closed pressure vessel, when the pressure of the balance chamber is greater than that of the working chamber, the electric control device controls the pressure relief port of the third flow control valve to relieve the pressure of the balance chamber, so that the pressure difference is no more than 10 KPa.

[0026] The control method of the back pressure type corrosion prevention device of the closed pressure vessel, wherein the pressure range of the working chamber is -0.1 MPa-1.6 MPa.

[0027] The control method of the back pressure type anticorrosion device of the closed pressure container, wherein when the pressure closed container is working, the pressure of the working cavity is in a normal pressure range, the pressure difference between the working cavity and the balance cavity is greater than 10KPa, and the pressure of the balance cavity is greater than that of the working cavity, then the pressure relief port of the balance cavity needs to be relieved by the electric control device through the flow control valve.

[0028] Beneficial effects: the anticorrosion and corrosion-resistant film structure is arranged in the pressure container body, so that the anticorrosion and corrosion-resistant effect can be realized when the closed pressure container cavity works, but the anticorrosion and corrosion-resistant film structure is prone to deformation when the positive and negative pressures of the closed pressure container work alternately, so the pressure control system is used to control the closed pressure container when it works, the pressure control between the working cavity and the balance cavity is realized, the deformation of the anticorrosion and corrosion-resistant film structure is small, and it is ensured that the anticorrosion layer of the anticorrosion and corrosion-resistant film structure will not fall off. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is an embodiment schematic view of the utility model.

[0030] Figure 2 is a second embodiment schematic view of the utility model.

[0031] Figure 3 is a method flow chart of the utility model.

[0032] Figure 4 is a specific step block diagram of step S1 in the method of the utility model.

[0033] Figure 5 is a specific step block diagram of step S2 in the method of the utility model.

[0034] Figure 6 is a specific step block diagram of step S12 in the method of the utility model.

[0035] Figure 7 is a specific step block diagram of step S21 in the method of the utility model.

[0036] In the figure: 1, pressure container body; 2, anticorrosion and corrosion-resistant film structure; 3, working cavity; 4, balance cavity; 5, air pressure source; 6a, first flow control valve; 6b, second flow control valve; 6c, third flow control valve; 7, pressure difference sensor; 8, electric control device; 9a, working cavity pressurizing port; 9b, balance cavity pressurizing port; 10a, working cavity pressure measuring port; 10b, balance cavity pressure measuring port; 11, pressure relief port; 12, filter; 13, working air source; 14, back pressure air source. DETAILED DESCRIPTION

[0037] In order to make the utility model's purpose, technical scheme and advantage more clear, definite, the following refers to the drawing and takes the example to this utility model further detailedly.

[0038] As Figures 1-2 The utility model discloses a back pressure type anticorrosion device of closed pressure vessel, it includes: pressure vessel main body 1, anticorrosion corrosion -resistant membrane structure 2 and pressure control system, anticorrosion corrosion -resistant membrane structure 2 divides pressure vessel main body 1 into working chamber 3 and balance chamber 4, the pressure control system controls the pressure difference between working chamber 3 and balance chamber 4 not more than 10KPa, the pressure control system includes the gas pressure source 5 for filling pressure of working chamber 3 and balance chamber 4, first flow control valve 6a for controlling gas flow, second flow control valve 6b, third flow control valve 6c, the pressure difference sensor 7 for measuring the pressure difference between working chamber 3 and balance chamber 4 and electric control device 8, the pressure difference sensor 7 is connected working chamber 3 and balance chamber 4 respectively, the gas pressure source 5 is connected working chamber 3 through first flow control valve 6a, the gas pressure source 5 is connected balance chamber 4 through second flow control valve 6b, the electric control device 8 is used to receive the signal of pressure difference sensor 7, and controls gas pressure source 5, first flow control valve 6a, second flow control valve 6b, third flow control valve 6c, so that the pressure difference between working chamber 3 and balance chamber 4 not more than 10KPa.

[0039] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 9KPa.

[0040] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 8KPa.

[0041] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 7KPa.

[0042] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 6KPa.

[0043] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 5KPa.

[0044] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 4KPa.

[0045] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 3KPa.

[0046] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 2KPa.

[0047] In actual work, the pressure difference between working chamber 3 and balance chamber 4 is 1KPa.

[0048] In actual work, the pressure difference between the working cavity 3 and the balance cavity 4 is 0KPa.

[0049] After the above structure, the utility model discloses a corrosion -resistant film structure 2 is set up in pressure vessel main part 1, realizes the pressure vessel main part 1 is divided into working cavity 3 and balance cavity 4, when working, need to put into the battery sealed working cavity 3, then fill gas to working cavity, make working cavity 3 reach certain pressure, and in the process of filling gas, corrosion -resistant film structure 2 will change, when the change is too big, then will appear to fall off, so need pressure control system to control the pressure difference between working cavity 3 and balance cavity 4 within 10KPa, to prevent corrosion -resistant film structure 2 from changing too much, and because of adopting corrosion -resistant film structure 2, so can realize the anticorrosive effect of pressure vessel main part, and corrosion -resistant film structure 2 also will not cause harm to working battery when failure, simultaneously increase pressure difference sensor 7, equivalent to increase a layer of safety protection mechanism, the manufacturing cost of the utility model is lower than the manufacturing cost of the prior art sealed pressure vessel, and the processing technology is simple, and the safety is better.

[0050] The pressure vessel main part 1 is made of carbon steel, which can reduce the manufacturing cost.

[0051] Preferably, the corrosion -resistant film structure 2 is a stainless steel plate film structure or a Teflon rubber film structure, so that the anticorrosive effect of the pressure vessel main part can be realized, and the manufacturing cost is low.

[0052] Specifically, the working cavity 3 is provided with a working cavity pressurizing port 9a and a working cavity pressure measuring port 10a, the balance cavity 4 is provided with a balance cavity pressurizing port 9b and a balance cavity pressure measuring port 10b, the working cavity pressurizing port 9a is connected with a first flow control valve 6a through an air pipe, and the working cavity pressure measuring port 10a is connected with a pressure difference sensor 7, the balance cavity pressurizing port 9b is connected with a second flow control valve 6b through an air pipe, and the balance cavity pressure measuring port 10b is connected with the pressure difference sensor 7, the balance cavity 4 is further provided with a pressure relief port 11, the pressure relief port 11 is connected with a third flow control valve 6c, and the first flow control valve 6a, the second flow control valve 6b and the third flow control valve 6c are connected with an electric control device 8.

[0053] With the above structure, the working cavity 3 is provided with a working cavity pressurizing port 9a and a working cavity pressure measuring port 10a, and the balance cavity 4 is provided with a balance cavity pressurizing port 9b and a balance cavity pressure measuring port 10b; therefore, the air pressure source 5 can inflate and pressurize the working cavity 3 and the balance cavity 4, and the air inflation amount of the working cavity 3 and the balance cavity 4 can be controlled by the first flow control valve 6a, the second flow control valve 6b and the third flow control valve 6c, so as to realize the pressure control between the working cavity 3 and the balance cavity 4. The working cavity pressure measuring port 10a is connected with the differential pressure sensor 7, and the balance cavity pressure measuring port 10b is connected with the differential pressure sensor 7; therefore, the pressure difference between the working cavity 3 and the balance cavity 4 can be measured and fed back to the electric control device 8, so that the electric control device 8 can monitor the pressure difference between the working cavity 3 and the balance cavity 4 in real time.

[0054] Preferably, the differential pressure sensor 7 is a differential pressure gauge.

[0055] In one embodiment, the number of air pressure sources 5 is one, and the air pressure source 5 is further connected with a filter 12 for filtering. When the number of air pressure sources 5 is one, the working cavity 3 and the balance cavity 4 need to be inflated at the same time, so the gas in the balance cavity 4 will pollute the working cavity 3; therefore, the filter 12 can filter the gas, so that the gas inflated into the working cavity 3 is clean and will not pollute the working cavity 3.

[0056] In another embodiment, the number of air pressure sources 5 is two, and the two air pressure sources 5 are respectively a working air source 13 and a back pressure air source 14. The working air source 13 is communicated with the working cavity 3 through the first flow control valve 6a, and the back pressure air source 14 is communicated with the balance cavity 4 through the second flow control valve 6b. The working cavity 3 is inflated by the working air source 13, and the balance cavity 4 is inflated by the back pressure air source 14, so as to form independent control circuits and ensure the cleanliness of the working cavity 3.

[0057] As shown in Figures 3-7 The utility model discloses a control method of closed pressure vessel back pressure type anticorrosion device, which comprises the following steps:

[0058] S1: when the closed pressure vessel is started, the air pressure source 5 simultaneously pressurizes the working cavity 3 and the balance cavity 4 of the closed pressure vessel to a working cavity set working pressure value;

[0059] S11: S11: first, the working cavity 3 of the closed pressure vessel is filled with positive pressure gas or vacuumized to form negative pressure, and the balance cavity 4 is also filled with gas or vacuumized to form negative pressure;

[0060] S12: the differential pressure sensor 7 feeds back the pressure difference between the working cavity 3 and the balance cavity 4 detected to the electric control device 8, and the electric control device 8 judges and controls the pressure difference to be not greater than 10KPa;

[0061] S13: When the pressure of the working chamber 3 of the closed pressure vessel reaches the set pressure value, stop charging the working chamber 3 and the balancing chamber 4;

[0062] S2: When the closed pressure vessel is working, the working chamber 3 and the balancing chamber 4 of the closed pressure vessel are pressure-maintained;

[0063] S21: When the pressure of the working chamber of the closed pressure vessel is at the set pressure value, the electric control device 8 controls the gas pressure source 5 to remain static;

[0064] S22: The pressure difference sensor 7 feeds back the detected pressure difference value between the working chamber 3 and the balancing chamber 4 to the electric control device 8, which judges and controls the pressure difference value to be not greater than 10 KPa;

[0065] The control method of the back pressure type corrosion prevention device of the closed pressure vessel, wherein the working chamber 3 charging process in step S12 ensures the pressure difference value between the working chamber 3 and the balancing chamber 4:

[0066] S121: When the pressure difference value of the pressure difference sensor 7 is not greater than 10 KPa, the electric control device 8 controls the gas pressure source 5 to simultaneously charge the working chamber 3 and the balancing chamber 4, so that the pressure difference value between the working chamber 3 and the balancing chamber 4 is maintained to be not greater than 10 KPa;

[0067] S122: When the pressure difference value of the pressure difference sensor 7 is greater than 10 KPa; based on the pressure of the working chamber 3 of the closed pressure vessel, when the pressure of the balancing chamber 4 is less than that of the working chamber 3, the electric control device 8 controls the gas pressure source 5 to charge the working chamber 3 and the balancing chamber 4, and increases the charging amount of the balancing chamber 4, so that the pressure difference value is not greater than 10 KPa; based on the pressure of the working chamber 3 of the closed pressure vessel, when the pressure of the balancing chamber 4 is greater than that of the working chamber 3, the electric control device 8 controls the gas pressure source 5 to charge the working chamber 3 and the balancing chamber 4, and reduces the charging amount of the balancing chamber 4, so that the pressure difference value is not greater than 10 KPa;

[0068] The control method of the back pressure type corrosion prevention device of the closed pressure vessel, wherein the working chamber 3 pressure-maintaining process in step S22 ensures the pressure difference value between the working chamber 3 and the balancing chamber 4:

[0069] S211: When the pressure difference value of the pressure difference sensor 7 is not greater than 10 KPa, the electric control device 8 controls the gas pressure source 5 to remain static and not charge;

[0070] S212: When the pressure difference of the pressure differential sensor 7 is greater than 10KPa; taking the pressure of the working chamber 3 of the sealed pressure vessel as a reference, when the pressure of the balancing chamber 4 is less than the pressure of the working chamber 3, the electronic control device 8 controls the air pressure source 5 to pressurize the balancing chamber 4 so that the pressure difference is not greater than 10KPa; taking the pressure of the working chamber 3 of the sealed pressure vessel as a reference, when the pressure of the balancing chamber 4 is greater than the pressure of the working chamber 3, the electronic control device 8 controls the pressure relief port 11 of the third flow control valve 6c to relieve the pressure of the balancing chamber 4 so that the pressure difference is not greater than 10KPa.

[0071] Preferably, the pressure range of the working chamber 3 is -0.1 MPa-1.6 MPa.

[0072] The utility model is mainly used in the lithium battery injection process environment.

[0073] The utility model provides a layer of corrosion-resistant membrane structure 2 within the main body of the pressure vessel, so that the sealed pressure vessel cavity can achieve corrosion-resistant effects during operation. However, since the corrosion-resistant membrane structure 2 is prone to deformation when the sealed pressure vessel alternates between positive and negative pressures, the pressure control system controls the pressure between the working chamber 3 and the balance chamber 4 during operation, so that the corrosion-resistant membrane structure 2 produces minimal deformation, ensuring that the corrosion-resistant layer of the corrosion-resistant membrane structure 2 will not fall off. The sealed pressure vessel using this design structure has low manufacturing cost and simple processing technology.

[0074] The above is only a preferred embodiment 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 technical personnel in this technical field, any modification or equivalent replacement of the technical solution of the present invention without creative work does not deviate from the protection scope of the technical solution of the present invention.

Claims

1. A back pressure anti-corrosion device for a closed pressure vessel, characterized by: The invention comprises a pressure vessel body (1), an anti-corrosion and corrosion-resistant film structure (2) and a pressure control system, wherein the anti-corrosion and corrosion-resistant film structure (2) divides the pressure vessel body (1) into a working chamber (3) and a balancing chamber (4); the pressure control system controls the pressure difference between the working chamber (3) and the balancing chamber (4) to be no greater than 10 kPa; the pressure control system comprises an air pressure source (5) for filling the working chamber (3) and the balancing chamber (4) with pressure, a first flow control valve (6a), a second flow control valve (6b), and a third flow control valve (6c) for controlling the gas flow, and a pressure control valve for measuring the working chamber (3). A pressure differential sensor (7) for measuring the pressure difference between a working chamber (3) and a balancing chamber (4) and an electronic control device (8); the pressure differential sensor (7) is connected to the working chamber (3) and the balancing chamber (4) respectively; the air pressure source (5) is connected to the working chamber (3) via a first flow control valve (6a), and the air pressure source (5) is connected to the balancing chamber (4) via a second flow control valve (6b); the electronic control device (8) is used to receive a signal from the pressure differential sensor (7) and control the air pressure source (5), the first flow control valve (6a), the second flow control valve (6b), and the third flow control valve (6c).

2. The back pressure anti-corrosion device for a closed pressure vessel according to claim 1, characterized in that: The anti-corrosion and corrosion-resistant membrane structure (2) is a stainless steel plate membrane structure or a Teflon rubber membrane structure.

3. The back pressure anti-corrosion device for a closed pressure vessel according to claim 1, characterized in that: The working chamber (3) is provided with a working chamber pressurization port (9a) and a working chamber pressure measuring port (10a), and the balancing chamber (4) is provided with a balancing chamber pressurization port (9b) and a balancing chamber pressure measuring port (10b); the working chamber pressurization port (9a) is connected to a first flow control valve (6a) via an air pipe, and the working chamber pressure measuring port (10a) is connected to a differential pressure sensor (7); the balancing chamber pressurization port (9b) is connected to a second flow control valve (6b) via an air pipe, and the balancing chamber pressure measuring port (10b) is connected to a differential pressure sensor (7); the balancing chamber (4) is further provided with a pressure relief port (11), and the pressure relief port (11) is connected to a third flow control valve (6c); the first flow control valve (6a), the second flow control valve (6b), and the third flow control valve (6c) are connected to an electronic control device (8).

4. The back pressure anti-corrosion device for a closed pressure vessel according to claim 3, characterized in that: The differential pressure sensor (7) is a differential pressure gauge.

5. The back pressure anti-corrosion device for a closed pressure vessel according to claim 4, characterized in that: The number of the air pressure source (5) is one, and the air pressure source (5) is also connected to a filter (12) for filtering.

6. The back pressure anti-corrosion device for a closed pressure vessel according to claim 4, characterized in that: The number of the air pressure sources (5) is two, and the two air pressure sources (5) are respectively a working air source (13) and a back pressure air source (14). The working air source (13) is connected to the working chamber (3) through a first flow control valve (6a), and the back pressure air source (14) is connected to the balance chamber (4) through a second flow control valve (6b).

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