Automatic air exhaust and supply control device system and method for hot isostatic pressing foundation pit

Abstract

According to the automatic control device system and method for air exhaust and supply of the hot isostatic pressing foundation pit, through cooperative arrangement of the air supply assembly, the air exhaust assembly, the sensing device assembly and the control assembly, it is ensured that the oxygen concentration change in the foundation pit body can be monitored in real time, and according to data information fed back by an oxygen sensor, the oxygen concentration change can be monitored in real time. And automatic switching between a conventional ventilation mode and an emergency ventilation mode can be realized, so that the safety of operators is ensured, and the energy consumption is reduced. Besides, through linkage of the door control switch and the second exhaust fan, a safety defense line is added, even if the first exhaust fan breaks down, it can be guaranteed that no argon deposition exists in the foundation pit, it is guaranteed that the air quality reaches the standard, and therefore the operation safety of personnel is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of safety protection for hot isostatic pressing foundation pits, and relates to an automatic control device system and method for air supply and exhaust of a hot isostatic pressing foundation pit. Background Art

[0002] Hot isostatic pressing technology is a process production technology that combines high temperature and high pressure. The heating temperature is usually 1000 - 2000 °C. By using high-pressure inert gas or nitrogen in a closed container as the pressure transmission medium, the working pressure can reach 200 MPa. Under the combined action of high temperature and high pressure, the workpiece is evenly compressed in all directions. Therefore, the processed products have high density, good uniformity, and excellent performance. At the same time, this technology has the characteristics of short production cycle, few processes, low energy consumption, and small material loss, and is a necessary means for preparing high-performance materials.

[0003] A large amount of argon is used as a protective gas and pressure transmission medium during the production process of a hot isostatic press. Argon is a colorless, odorless monatomic gas. The density of argon is 1.4 times that of air and 10 times that of helium. The current hot isostatic pressing equipment foundation pit is 10 m deep. During the exhaust at the end of production and when there is a slight pipeline leakage during the production process, due to the density of argon being greater than that of air, argon deposition in the foundation pit will occur. When there are operators entering the foundation pit, there will be a risk of asphyxiation, and the safety of personnel cannot be guaranteed.

[0004] Currently, the traditional gas monitoring of hot isostatic pressing foundation pits only has a single gas concentration detection function, lacks automatic alarm and emergency treatment capabilities, and cannot take effective measures in time to ensure personnel safety during the exhaust process and gas leakage.

[0005] In summary, there is an urgent need to provide an automatic control device system and method for air supply and exhaust to realize real-time monitoring of the oxygen concentration in the hot isostatic pressing foundation pit, automatic alarm, and start emergency ventilation to ensure the safety of operators. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an automatic control device system and method for air supply and exhaust of a hot isostatic pressing foundation pit. Through the coordinated setting of an air supply component, an exhaust component, a sensing device component, and a control component, it is ensured that the change in the oxygen concentration in the foundation pit body can be monitored in real time, and according to the data information fed back by the oxygen sensor, it can automatically switch between a normal ventilation mode and an emergency ventilation mode to ensure the safety of operators and reduce energy consumption.

[0007] To achieve the purpose of this invention, the following technical solutions are adopted by the present invention:

[0008] In a first aspect, the present invention provides an automatic control device system for air supply and exhaust in a hot isostatic pressing foundation pit. The device system includes a foundation pit body, an air supply component, an exhaust component, a sensing device component, a door control switch, and a control component;

[0009] The air supply component includes an air supply fan and a plurality of air supply pipes; the air supply pipes are arranged at the top of the foundation pit body and extend downward along the side wall of the foundation pit body; the air supply pipes are connected to the air supply fan through a circular pipe;

[0010] The exhaust component includes a first exhaust fan, a second exhaust fan, and a plurality of exhaust pipes; the exhaust pipes are arranged at the bottom of the foundation pit body and are arranged along the length direction of the foundation pit body; the exhaust pipes are connected in parallel to the first exhaust fan and the second exhaust fan through connecting components;

[0011] The sensing device component includes a plurality of oxygen sensors; the oxygen sensors are used to monitor the oxygen concentration in the foundation pit body;

[0012] The door control switch is arranged on the outer surface of the door panel of the foundation pit body; the door control switch is electrically connected to the second exhaust fan;

[0013] The air supply fan, the first exhaust fan, the second exhaust fan, and the sensing device component are all electrically connected to the control component; the control component controls the opening and closing of the first exhaust fan and the second exhaust fan based on the detection results of the oxygen sensors.

[0014] The automatic control device system for air supply and exhaust provided by the present invention, through the coordinated setting of the air supply component, the exhaust component, the sensing device component, and the control component, ensures that the change of oxygen concentration in the foundation pit body can be monitored in real time, and according to the data information fed back by the oxygen sensors, it can automatically switch between the conventional ventilation mode and the emergency ventilation mode, which not only ensures the safety of operators but also reduces energy consumption. In addition, through the linkage of the door control switch and the second exhaust fan, an additional safety defense line is added, which can ensure that there is no argon deposition in the foundation pit even when the first exhaust fan fails, ensuring that the air quality meets the standard, thereby guaranteeing the safety of personnel operations.

[0015] It should be noted that through the layout and design of the air supply pipes and the exhaust pipes, not only the all-round air supply in the foundation pit is realized, but also the high-density argon can be discharged nearby, significantly improving the argon discharge efficiency in the foundation pit, further ensuring that there is no argon deposition in the foundation pit and ensuring that the air quality meets the standard.

[0016] As a preferred technical solution of the present invention, a plurality of air supply outlets are arranged on the side of the air supply pipe facing the inside of the foundation pit body.

[0017] Preferably, the distance between adjacent air supply pipes is 90 - 110 cm.

[0018] Preferably, the minimum distance between the air supply duct and the bottom of the foundation pit body is 90 - 110 cm.

[0019] As a preferred technical solution of the present invention, a plurality of air outlets are distributed at intervals on the exhaust duct.

[0020] Preferably, the distance between adjacent air outlets is 40 - 80 cm.

[0021] Preferably, the height of the exhaust duct from the bottom of the foundation pit body is 40 - 60 cm.

[0022] As a preferred technical solution of the present invention, the connecting component includes a tee component.

[0023] Preferably, the tee component includes a main pipe, one end of the main pipe is connected to the exhaust duct, and the other end is communicated with a first branch pipe and a second branch pipe; the other end of the first branch pipe is connected to a first exhaust fan; the other end of the second branch pipe is connected to a second exhaust fan.

[0024] Preferably, a first one-way valve is provided on the first branch pipe.

[0025] Preferably, a second one-way valve is provided on the second branch pipe.

[0026] Preferably, the control component controls the opening and closing of the first one-way valve and the second one-way valve based on the detection result of the oxygen sensor.

[0027] Preferably, the door control switch is used to control the opening and closing of the second one-way valve

[0028] As a preferred technical solution of the present invention, the oxygen sensors are arranged at intervals in the foundation pit body.

[0029] Preferably, the sensing device assembly further includes an argon sensor; the argon sensor is used to monitor the argon concentration in the foundation pit body.

[0030] As a preferred technical solution of the present invention, the control component includes a PLC controller and a display screen.

[0031] Preferably, the display screen is electrically connected to the PLC controller.

[0032] Preferably, the device system further includes an alarm.

[0033] Preferably, the alarm is electrically connected to the PLC controller.

[0034] In a second aspect, the present invention provides an automatic control method for exhaust and supply air of a hot isostatic pressing foundation pit. The exhaust and supply air automatic control method is carried out by applying the device system described in the first aspect, and includes the following steps:

[0035] (1) Start the oxygen sensor, the air blower, and the first exhaust fan. Air enters the foundation pit body through the air supply pipe, and the gas in the foundation pit is discharged through the exhaust pipe. When the operator opens the door panel of the foundation pit body, the second exhaust fan is automatically triggered to start through the door control switch.

[0036] (2) Obtain the oxygen concentration value of the oxygen sensor in real time through the control component. When the oxygen concentration value exceeds the preset oxygen concentration range, turn off the first exhaust fan and start the second exhaust fan until the oxygen concentration value returns to the preset oxygen concentration range, then turn off the second exhaust fan and start the first exhaust fan.

[0037] The method provided by the present invention, based on the real-time monitoring data of the oxygen sensor, automatically adjusts the operating states of the first exhaust fan and the second exhaust fan according to the oxygen concentration in the foundation pit through the control component, dynamically adjusts the exhaust air volume, thereby ensuring the safety of the operators while reducing energy consumption. In addition, the door control switch is linked with the second exhaust fan. When the operator enters the foundation pit body for operation, the door control switch automatically triggers the second exhaust fan to start, implementing secondary ventilation to further prevent the deposition of argon gas in the foundation pit and ensure the safety of the operating environment.

[0038] It should be noted that when the operator enters the foundation pit body for operation, the door panel of the foundation pit body is always in the open state. If the oxygen concentration value is within the preset oxygen concentration range, the second exhaust fan is automatically turned off to save energy.

[0039] As a preferred technical solution of the present invention, the air volume of the air blower and the first exhaust fan is independently 12000 - 15000 m 3 / h.

[0040] Preferably, the working power of the air blower and the first exhaust fan is independently 4 - 6 kW.

[0041] Preferably, the air volume of the second exhaust fan is 20000 - 35000 m 3 / h.

[0042] Preferably, the working power of the second exhaust fan is 12 - 18 kW.

[0043] As a preferred technical solution of the present invention, the preset oxygen concentration range in step (2) is 19.5% - 23.5%.

[0044] Preferably, when the oxygen concentration value exceeds the preset oxygen concentration range in step (2), an alarm instruction is issued.

[0045] Preferably, the alarm instruction includes the flashing of the display screen and / or the emission of an alarm sound.

[0046] As a preferred technical solution of the present invention, when the operator closes the door panel of the foundation pit body, the second exhaust fan is automatically triggered to close through the door control switch.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] (1) The air supply and exhaust automatic control device system and method provided by the present invention, through the coordinated setting of the air supply component, exhaust component, sensing device component and control component, ensure that the oxygen concentration change in the foundation pit body can be monitored in real time, and according to the data information fed back by the oxygen sensor, it can automatically switch between the conventional ventilation mode and the emergency ventilation mode, ensuring the safety of the operator while reducing energy consumption;

[0049] (2) The air supply and exhaust automatic control device system provided by the present invention realizes double safety guarantees through the linkage of the door control switch and the second exhaust fan, and even when the first exhaust fan fails, it can ensure that there is no argon deposition in the foundation pit and ensure that the air quality meets the standard, thereby ensuring the safety of personnel operations;

[0050] (3) The air supply and exhaust automatic control device system provided by the present invention, through the layout and design of the air supply pipe and the exhaust pipe, not only realizes the all-round air supply in the foundation pit, but also enables the high-density argon to be discharged nearby, significantly improving the argon discharge efficiency in the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is the front view of the air supply and exhaust automatic control device system of the hot isostatic pressing foundation pit provided in Embodiment 1;

[0052] Figure 2 is the structural schematic diagram of the air supply component provided in Embodiment 1;

[0053] Figure 3 is the schematic diagram of the PLC control module of the air supply and exhaust automatic control device system provided in Embodiment 1;

[0054] Figure 4 is the structural schematic diagram of the tee component provided in Embodiment 2;.

[0055] Among them, 1 - foundation pit body, 2 - air supply fan, 3 - air supply pipe, 4 - air supply port, 5 - first exhaust fan, 6 - second exhaust fan, 7 - exhaust pipe, 8 - exhaust port, 9 - oxygen sensor, 10 - annular pipe, 11 - connecting component, 111 - main pipe, 112 - first branch pipe, 113 - second branch pipe, 114 - first check valve, 115 - first check valve, 12 - door control switch, 13 - PLC controller, 14 - display screen, 15 - alarm. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0056] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0057] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0058] The specific embodiment of the present invention provides an automatic control device system for air supply and exhaust in a hot isostatic pressing foundation pit. The device system includes a foundation pit body, an air supply component, an exhaust component, a sensing device component, a door control switch, and a control component;

[0059] The air supply component includes an air supply fan and a plurality of air supply pipes; the air supply pipes are arranged on the top of the foundation pit body and extend downward along the side wall of the foundation pit body; the air supply pipes are connected to the air supply fan through a circular pipe;

[0060] The exhaust component includes a first exhaust fan, a second exhaust fan, and a plurality of exhaust pipes; the exhaust pipes are arranged at the bottom of the foundation pit body and are arranged along the length direction of the foundation pit body; the exhaust pipes are connected in parallel to the first exhaust fan and the second exhaust fan through a connecting component;

[0061] The sensing device component includes a plurality of oxygen sensors; the oxygen sensors are used to monitor the oxygen concentration in the foundation pit body;

[0062] The door control switch is arranged on the outer surface of the door plate of the foundation pit body; the door control switch is electrically connected to the second exhaust fan;

[0063] The air supply fan, the first exhaust fan, the second exhaust fan, and the sensing device component are all electrically connected to the control component; the control component controls the opening and closing of the first exhaust fan and the second exhaust fan based on the detection result of the oxygen sensor.

[0064] It should be noted that due to the relatively high density of argon, its distribution in space is easily affected by local deposition, resulting in instability in the concentration data detected by the argon sensor. As a result, the switching between the first row of fans and the second row of fans is frequent, which not only increases energy consumption but also fails to effectively ensure that the air quality in each area of the foundation pit meets the safety standards. Therefore, the present invention selects the oxygen concentration as the judgment factor for the air quality in the foundation pit to meet the standard.

[0065] In some embodiments of the present invention, a plurality of air supply outlets are provided on the side of the air supply duct facing the inside of the foundation pit body.

[0066] In some embodiments of the present invention, the distance between adjacent air supply ducts is 90 - 110 cm. For example, it can be 92 cm, 95 cm, 96 cm, 98 cm, 100 cm, 102 cm, 105 cm, 106 cm or 108 cm, etc., but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0067] It should be noted that by reasonably arranging the distribution distance of the air supply ducts, not only can it ensure that fresh air can be evenly sent to each area in the foundation pit, avoiding the phenomenon of insufficient ventilation in local areas, but also it can effectively dilute and discharge the harmful gases in the foundation pit, preventing their deposition, thereby ensuring the safety of the operators.

[0068] In some embodiments of the present invention, the minimum distance between the air supply duct and the bottom of the foundation pit body is 90 - 110 cm. For example, it can be 92 cm, 95 cm, 96 cm, 98 cm, 100 cm, 102 cm, 105 cm, 106 cm or 108 cm, etc., but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0069] In some embodiments of the present invention, a plurality of exhaust outlets are spaced apart on the exhaust duct.

[0070] In some embodiments of the present invention, the distance between adjacent exhaust outlets is 40 - 80 cm. For example, it can be 45 cm, 50 cm, 55 cm, 60 cm, 65 cm, 70 cm or 75 cm, etc., but is not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0071] It should be noted that through the layout and design of a plurality of exhaust outlets, the air flow organization and effective exhaust path are optimized, ensuring that the harmful gases in the foundation pit are discharged in a timely manner, and at the same time avoiding their deposition in local areas, thereby improving the overall efficiency of the ventilation system.

[0072] In some embodiments of the present invention, the height of the exhaust duct from the bottom of the foundation pit body is 40 - 60 cm. For example, it can be 42 cm, 45 cm, 46 cm, 48 cm, 50 cm, 52 cm, 55 cm, 56 cm or 58 cm, etc., but not limited to the listed values. Other unlisted values within the numerical range are equally applicable.

[0073] It should be noted that by setting the exhaust duct at a lower position and the supply duct at a higher position, a more reasonable air flow organization can be formed. After the fresh air is sent into the foundation pit from a high place, it will naturally sink and displace the air in the foundation pit, while the exhaust duct discharges argon and other harmful gases from a low place, thereby improving the ventilation efficiency. In addition, since argon will accumulate in low-lying areas, the exhaust duct at a lower position can timely discharge the argon in these areas to avoid its excessive concentration in local areas, thus ensuring the safety of the operators.

[0074] In some embodiments of the present invention, the connecting component includes a tee member.

[0075] In some embodiments of the present invention, the tee member includes a main pipe. One end of the main pipe is connected to the exhaust duct, and the other end is communicated with a first branch pipe and a second branch pipe. The other end of the first branch pipe is connected to a first exhaust fan. The other end of the second branch pipe is connected to a second exhaust fan.

[0076] In some embodiments of the present invention, a first one-way valve is provided on the first branch pipe.

[0077] In some embodiments of the present invention, a second one-way valve is provided on the second branch pipe.

[0078] The tee member used in the present invention makes the connection of the two fans more convenient and saves space.

[0079] In some embodiments of the present invention, the control component controls the opening and closing of the first one-way valve and the second one-way valve based on the detection result of the oxygen sensor.

[0080] In some embodiments of the present invention, the door control switch controls the opening and closing of the second one-way valve.

[0081] In some embodiments of the present invention, the oxygen sensors are arranged at intervals in the foundation pit body.

[0082] In some embodiments of the present invention, the sensing device assembly further includes an argon sensor. The argon sensor is used to monitor the argon concentration in the foundation pit body.

[0083] In some embodiments of the present invention, the control component includes a PLC controller and a display screen.

[0084] In some embodiments of the present invention, the display screen is electrically connected to the PLC controller.

[0085] In some embodiments of the present invention, the device system further includes an alarm.

[0086] In some embodiments of the present invention, the alarm is electrically connected to the PLC controller.

[0087] The specific embodiments of the present invention further provide an automatic control method for exhaust and supply air of a hot isostatic pressing foundation pit. The exhaust and supply air automatic control method is carried out by applying the aforementioned device system, and includes the following steps:

[0088] (1) Start the oxygen sensor, the air supply fan and the first exhaust fan. Air enters the foundation pit body through the air supply pipe, and the gas in the foundation pit is discharged through the exhaust pipe; when an operator opens the door panel of the foundation pit body, the second exhaust fan is automatically triggered to start through the door control switch;

[0089] (2) Obtain the oxygen concentration value of the oxygen sensor in real time through the control component. When the oxygen concentration value exceeds the preset oxygen concentration range, turn off the first exhaust fan and start the second exhaust fan until the oxygen concentration value returns to the preset oxygen concentration range, then turn off the second exhaust fan and start the first exhaust fan.

[0090] In some embodiments of the present invention, the air volume of the air supply fan and the first exhaust fan is independently 12000 - 15000 m 3 / h, for example, it can be 12500 m 3 / h, 13000 m 3 / h, 13500 m 3 / h, 14000 m 3 / h or 14500 m 3 / h, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0091] In some embodiments of the present invention, the working power of the air supply fan and the first exhaust fan is independently 4 - 6 kW, for example, it can be 4.2 kW, 4.5 kW, 4.6 kW, 4.8 kW, 5 kW, 5.2 kW, 5.5 kW, 5.6 kW or 5.8 kW, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0092] In some embodiments of the present invention, the air volume of the second exhaust fan is 20000 - 35000 m 3 / h, for example, it can be 21000 m 3 / h, 22000 m 3 / h, 23000 m 3 / h, 25000 m 3 / h, 26000 m 3 / h, 28000 m 3 / h, 30000 m 3 / h, 32000 m 3 / h or 34000 m 3 / h, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0093] In some embodiments of the present invention, the working power of the second exhaust fan is 12 - 18 kW. For example, it can be 12.5 kW, 13 kW, 13.5 kW, 14 kW, 14.5 kW, 16 kW, 16.5 kW, 17 kW, or 17.5 kW, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0094] In some embodiments of the present invention, the preset oxygen concentration range in step (2) is 19.5% - 23.5%. For example, it can be 20%, 20.5%, 21%, 21.5%, 22%, 22.5%, or 23%, etc., but not limited to the listed values, and other unlisted values within the numerical range are equally applicable.

[0095] In some embodiments of the present invention, when the oxygen concentration value exceeds the preset oxygen concentration range in step (2), an alarm instruction is issued.

[0096] In some embodiments of the present invention, the alarm instruction includes the display screen flashing and / or emitting an alarm sound.

[0097] In the present invention, by setting an alarm, when the oxygen concentration value exceeds the preset oxygen concentration range, an alarm instruction is issued to remind the staff to monitor the change of the oxygen concentration on the display screen. If a fault occurs in the device system, the second exhaust fan is manually started in time.

[0098] In some embodiments of the present invention, in step (2), when the operator closes the door panel of the foundation pit body, the second exhaust fan is automatically triggered to close through the door control switch.

[0099] It should be noted that when the operator leaves the foundation pit, the controller continues to monitor the change of the oxygen concentration. If the oxygen concentration value exceeds the preset oxygen concentration range, the first exhaust fan is closed and the second exhaust fan is started.

[0100] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments. In the following examples and comparative examples, the number of settings of the air supply pipe, air supply outlet, exhaust pipe, exhaust outlet, and oxygen sensor is not specifically limited, and those skilled in the art can set them according to actual needs.

[0101] Example 1

[0102] This embodiment provides an automatic control device system for air supply and exhaust in a hot isostatic pressing foundation pit. The device system (as shown in Figure 1 ) includes a foundation pit body, an air supply component, an exhaust component, a sensing device component, a door control switch, and a control component;

[0103] The air supply component includes an air supply fan 2 and a plurality of air supply pipes 3; the air supply pipes 3 are arranged at the top of the foundation pit body 1 and extend downward along the side wall of the foundation pit body 1; the air supply pipes 3 are connected to the air supply fan 2 through an annular pipe 10 (as shown in Figure 2 ); a plurality of air supply openings 4 are arranged on the side of the air supply pipe 3 facing the inside of the foundation pit body 1; the distance between adjacent air supply pipes 3 is 100 cm; the height of the air supply pipe 3 from the bottom end of the foundation pit body 1 is 100 cm;

[0104] The exhaust component includes a first exhaust fan 5, a second exhaust fan 6, and a plurality of exhaust pipes 7; the exhaust pipes 7 are arranged at the bottom of the foundation pit body 1 and are arranged along the length direction of the foundation pit body 1; the exhaust pipes 7 are connected in parallel to the first exhaust fan 5 and the second exhaust fan 6 through connecting components; a plurality of exhaust openings 8 are distributed at intervals on the exhaust pipes 7; the distance between adjacent exhaust openings 8 is 60 cm; the height of the exhaust pipe 7 from the bottom end of the foundation pit body 1 is 50 cm;

[0105] The sensing device component includes a plurality of oxygen sensors 9; the oxygen sensors 9 are arranged at intervals inside the foundation pit body 1; the oxygen sensors 9 are used to monitor the oxygen concentration inside the foundation pit body 1;

[0106] The door control switch 12 is arranged on the outer surface of the door panel of the foundation pit body 1; the door control switch 12 is electrically connected to the second exhaust fan 6;

[0107] The control component includes a PLC controller 13 and a display screen 14; the display screen 14 is electrically connected to the PLC controller 13;

[0108] The device system further includes an alarm 15;

[0109] The air supply fan 2, the first exhaust fan 5, the second exhaust fan 6, the oxygen sensor 9, and the alarm 15 are all electrically connected to the PLC controller 13 (as shown in Figure 3 ). The PLC controller 13 controls the opening and closing of the first exhaust fan 5 and the second exhaust fan 6 based on the detection result of the oxygen sensor 9.

[0110] Example 2

[0111] This embodiment provides an automatic control device system for the exhaust and supply air of a hot isostatic pressing foundation pit, and further defines on the basis of Embodiment 1:

[0112] The connecting component is a tee component; the tee component (as Figure 4 shown) includes a main pipe 111, one end of the main pipe 111 is connected to the exhaust pipe, and the other end is communicated with a first branch pipe 112 and a second branch pipe 113; the other end of the first branch pipe 112 is connected to a first exhaust fan; the other end of the second branch pipe 113 is connected to a second exhaust fan; a first one-way valve 114 is arranged on the first branch pipe 112; a second one-way valve 115 is arranged on the second branch pipe 113; the PLC controller controls the opening and closing of the first one-way valve and the second one-way valve based on the detection result of the oxygen sensor; the door control switch is used to control the opening and closing of the second one-way valve;

[0113] The sensing device assembly further includes an argon sensor; the argon sensor is used to monitor the argon concentration in the foundation pit body.

[0114] Embodiment 3

[0115] This embodiment provides an automatic control device system for the exhaust and supply air of a hot isostatic pressing foundation pit. Except that the minimum distance between the supply air pipe and the bottom of the foundation pit body is 150 cm, other conditions are the same as those in Embodiment 1.

[0116] Embodiment 4

[0117] This embodiment provides an automatic control device system for the exhaust and supply air of a hot isostatic pressing foundation pit. Except that the minimum distance between the supply air pipe and the bottom of the foundation pit body is 70 cm, other conditions are the same as those in Embodiment 1.

[0118] Embodiment 5

[0119] This embodiment provides an automatic control device system for the exhaust and supply air of a hot isostatic pressing foundation pit. Except that the height of the exhaust pipe from the bottom of the foundation pit body is 20 cm, other conditions are the same as those in Embodiment 1.

[0120] Comparative Example 1

[0121] This comparative example provides an automatic control device system for the exhaust and supply air of a hot isostatic pressing foundation pit. Except that there is no door control switch, that is, the door control switch is not electrically connected to the second exhaust fan, other conditions are the same as those in Embodiment 1.

[0122] Comparative Example 2

[0123] This comparative example provides an automatic control device system for the exhaust and supply air of a hot isostatic pressing foundation pit. Except that there is no second exhaust fan, other conditions are the same as those in Embodiment 1.

[0124] Application Example 1

[0125] This application example provides an automatic control method for air supply and exhaust in a hot isostatic pressing foundation pit. Using the air supply and exhaust automatic control device system provided in Application Example 1, it includes the following steps:

[0126] (1) Start the oxygen sensor 9, the air supply fan 2 and the first exhaust fan 5. Air enters the foundation pit body through the air supply pipe 3 and the gas in the foundation pit is discharged through the exhaust pipe 7. When an operator opens the door panel of the foundation pit body, the second exhaust fan 6 is automatically triggered to start through the door control switch. When the operator closes the door panel of the foundation pit body, the second exhaust fan 6 is automatically triggered to close through the door control switch;

[0127] (2) The PLC controller 13 obtains the oxygen concentration value of the oxygen sensor 9 in real time. When the oxygen concentration value is lower than 20%, an alarm instruction is issued and the first exhaust fan 5 is closed, and the second exhaust fan 6 is started until the oxygen concentration value returns to 20%, then the second exhaust fan 6 is closed and the first exhaust fan 5 is started;

[0128] Among them, the air volume of the air supply fan 2 and the first exhaust fan 5 is independently 13000 m 3 / h, and the working power is independently 5 kW; the air volume of the second exhaust fan 6 is 30000 m 3 / h, and the working power is 15 kW.

[0129] Application Example 2

[0130] This application example provides an automatic control method for air supply and exhaust in a hot isostatic pressing foundation pit. Except for the air supply and exhaust automatic control device system provided in Application Example 2, other conditions are the same as those in Application Example 1.

[0131] In Application Examples 1 - 2, based on the real-time monitoring data of the oxygen sensor, the PLC controller automatically adjusts the operating states of the first exhaust fan and the second exhaust fan according to the oxygen concentration in the foundation pit, dynamically adjusts the exhaust air volume, so as to reduce energy consumption while ensuring the safety of operators. In addition, through the linkage design of the door control switch and the second exhaust fan, when an operator enters the foundation pit, the door control switch automatically triggers the second exhaust fan to start, implementing secondary ventilation, adding an additional safety defense line, being able to flexibly respond to emergencies, and further ensuring the safety of the working environment.

[0132] Application Example 3

[0133] This application example provides an automatic control method for air supply and exhaust in a hot isostatic pressing foundation pit. Except for the air supply and exhaust automatic control device system provided in Application Example 3, other conditions are the same as those in Application Example 1.

[0134] In this application example, since the distance between the height at which the air supply duct is installed and the bottom of the foundation pit body is too far, the air flow distribution in the foundation pit is uneven, resulting in the fresh air being unable to replace the argon gas deposited at the bottom of the foundation pit in a timely and effective manner, affecting the ventilation effect and increasing the safety risk for the operating personnel.

[0135] Application Example 4

[0136] This application example provides an automatic control method for exhaust and supply air in a hot isostatic pressing foundation pit. Except for the exhaust and supply air automatic control device system provided in Application Example 4, other conditions are the same as those in Application Example 1.

[0137] In this application example, since the distance between the height at which the air supply duct is installed and the bottom of the foundation pit body is too close, the distance between the air supply duct and the exhaust duct is too close, resulting in the fresh air being directly discharged without being effectively replaced, forming an air flow short circuit, reducing the ventilation efficiency. Since the fresh air cannot fully diffuse to other areas of the foundation pit, it is easy to form ventilation dead spots in the foundation pit, leading to argon gas deposition and increasing the safety risk for the operating personnel.

[0138] Application Example 5

[0139] This application example provides an automatic control method for exhaust and supply air in a hot isostatic pressing foundation pit. Except for the exhaust and supply air automatic control device system provided in Application Example 5, other conditions are the same as those in Application Example 1.

[0140] In this application example, since the height of the exhaust duct from the bottom of the foundation pit body is too close, there is a risk of argon gas deposition, which further increases the safety risk for the operating personnel.

[0141] Comparative Application Example 1

[0142] This comparative application example provides an automatic control method for exhaust and supply air in a hot isostatic pressing foundation pit. Using the exhaust and supply air automatic control device system provided in Comparative Example 1, it includes the following steps:

[0143] (1) Start the oxygen sensor, the air supply fan, and the first exhaust fan. The air enters the foundation pit body through the air supply duct and the gas in the foundation pit is discharged through the exhaust pipe;

[0144] (2) Obtain the oxygen concentration value of the oxygen sensor in real time through the PLC controller. When the oxygen concentration value is lower than 20%, send an alarm instruction and turn off the first exhaust fan, start the second exhaust fan until the oxygen concentration value returns to 20%, then turn off the second exhaust fan and start the first exhaust fan;

[0145] Among them, the air volume of the air supply fan and the first exhaust fan is independently 13000 m 3 / h, and the working power is independently 5 kW; the air volume of the second exhaust fan is 30000 m 3 / h, and the working power is 15 kW.

[0146] In this comparative application example, although the device system can automatically switch between the conventional ventilation mode and the emergency ventilation mode, due to the lack of a second line of safety defense, when the first row of fans fails, it is impossible to ensure that there is no argon deposition in the foundation pit, thereby increasing the safety risk for operators when entering the foundation pit.

[0147] Comparative Application Example 2

[0148] This comparative application example provides an air supply and exhaust method for a hot isostatic pressing foundation pit, applying the air supply and exhaust device system provided in Comparative Example 2, including:

[0149] Start the oxygen sensor, the air blower, and the first row of fans. Air enters the foundation pit body through the air supply pipe, and the gas in the foundation pit is discharged through the exhaust pipe. The oxygen concentration value of the oxygen sensor is obtained in real time through the PLC controller. When the oxygen concentration value is lower than 20%, an alarm instruction is issued to remind the operator to leave the foundation pit body.

[0150] In this comparative application example, when the oxygen concentration value is not within the preset oxygen concentration range, the air exhaust volume cannot be regulated, which may cause argon to deposit in the operation area, thus affecting the safety and operation efficiency of the operator.

[0151] The applicant declares that the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the public disclosure scope of the present invention.

Claims

1. An automatic control system for exhaust and supply air of a hot isostatic pressing pit, characterized in that: The device system includes a foundation pit body, an air supply component, an exhaust component, a sensor device component, a door control switch and a control component; The air supply assembly includes an air supply fan and a plurality of air supply pipes; the air supply pipes are arranged on the top of the foundation pit body and extend downward along the side wall of the foundation pit body; the air supply pipes are connected to the air supply fan through an annular pipeline; The exhaust assembly includes a first exhaust fan, a second exhaust fan and a plurality of exhaust pipes; the exhaust pipes are arranged at the bottom of the foundation pit body and along the length direction of the foundation pit body; the exhaust pipes are connected in parallel with the first exhaust fan and the second exhaust fan through a connecting component; The sensor assembly includes a plurality of oxygen sensors; the oxygen sensors are used to monitor the oxygen concentration in the foundation pit body; The door-controlled switch is arranged on the outer surface of the door plate of the foundation pit body; the door-controlled switch is electrically connected to the second exhaust fan; The blower, the first exhaust fan, the second exhaust fan, and the sensor device assembly are all electrically connected to a control assembly; the control assembly controls the opening and closing of the first exhaust fan and the second exhaust fan based on the detection result of the oxygen sensor.

2. The exhaust and supply air automatic control device system according to claim 1, characterized in that: The air supply pipe is provided with a plurality of air supply ports on one side facing the foundation pit body; Preferably, the distance between adjacent air supply pipes is 90-110 cm; Preferably, the minimum distance between the air supply pipe and the bottom of the foundation pit body is 90-110 cm.

3. The exhaust and supply air automatic control device system according to claim 1 or 2, characterized in that: The exhaust pipe is provided with a plurality of exhaust ports at intervals; Preferably, the distance between adjacent exhaust vents is 40-80 cm; Preferably, the height of the exhaust pipe from the bottom of the foundation pit body is 40-60 cm.

4. The exhaust and supply air automatic control device system according to any one of claims 1 to 3, characterized in that: The connecting component comprises a three-way component; Preferably, the three-way component includes a main pipe, one end of which is connected to the exhaust pipe, and the other end of which is connected to the first branch pipe and the second branch pipe; the other end of the first branch pipe is connected to the first exhaust fan; the other end of the second branch pipe is connected to the second exhaust fan; Preferably, a first one-way valve is provided on the first branch pipe; Preferably, a second one-way valve is provided on the second branch pipe; Preferably, the control component controls the opening and closing of the first one-way valve and the second one-way valve based on the detection result of the oxygen sensor; Preferably, the gate-controlled switch is used to control the opening and closing of the second one-way valve.

5. The exhaust and supply air automatic control device system according to any one of claims 1 to 4, characterized in that: The oxygen sensors are arranged at intervals in the foundation pit body; Preferably, the sensor device assembly also includes an argon sensor; the argon sensor is used to monitor the argon concentration in the foundation pit body.

6. The exhaust and supply air automatic control device system according to any one of claims 1 to 5, characterized in that: The control component includes a PLC controller and a display screen; Preferably, the display screen is electrically connected to the PLC controller; Preferably, the exhaust and supply air automatic control device system further includes an alarm; Preferably, the alarm is electrically connected to the PLC controller.

7. A method for automatically controlling exhaust and supply air in a hot isostatic pressing pit, characterized in that: The exhaust and supply air automatic control method is performed by using the exhaust and supply air automatic control device system according to any one of claims 1 to 6, comprising the following steps: (1) Start the oxygen sensor, the air supply fan and the first exhaust fan. The air enters the foundation pit through the air supply pipe and exhausts the gas in the foundation pit through the exhaust pipe. When the operator opens the door panel of the foundation pit, the second exhaust fan is automatically triggered and started through the door control switch. (2) The oxygen concentration value of the oxygen sensor is obtained in real time through the control component. When the oxygen concentration value exceeds the preset oxygen concentration range, the first exhaust fan is turned off and the second exhaust fan is started until the oxygen concentration value returns to the preset oxygen concentration range, the second exhaust fan is turned off, and the first exhaust fan is started.

8. The automatic exhaust and supply air control method according to claim 7, characterized in that: The air volume of the air supply fan and the first exhaust fan is independently 12000-15000m 3 / h; Preferably, the operating power of the air supply fan and the first exhaust fan is independently 4-6kW; Preferably, the air volume of the second row of fans is 20000-35000m 3 / h; Preferably, the operating power of the second row of fans is 12-18 kW.

9. The automatic exhaust and supply air control method according to claim 7 or 8, characterized in that: The preset oxygen concentration range in step (2) is 19.5%-23.5%; Preferably, when the oxygen concentration value in step (2) exceeds a preset oxygen concentration range, an alarm instruction is issued; Preferably, the alarm instruction includes flashing a display screen and / or sounding an alarm.

10. The exhaust and supply air automatic control method according to any one of claims 7 to 9, characterized in that: When the operator closes the door panel of the foundation pit body, the second exhaust fan is automatically triggered to shut down through the door control switch.

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