Vacuum control system and vacuum hot press apparatus

Abstract

This application relates to a vacuum control system and a vacuum hot pressing device. The vacuum control system includes a pump assembly and a tank assembly. The pump assembly includes at least two vacuum pumps connected in parallel, each vacuum pump being connected to a press. The tank assembly includes at least one vacuum tank. The output end of the tank assembly is connected to the pump assembly, and the input end of the tank assembly is connected to the press. The output end of the tank assembly is connected to the pump assembly, allowing the vacuum pumps to extract gas from the vacuum tank, thus pre-storing negative pressure in the vacuum tank. When the pressure value inside the press reaches the target value, since the input end of the tank assembly is connected to the press, each vacuum pump can be shut down. The vacuum level inside the press is maintained by the tank assembly, providing dynamic pressure compensation for the vacuum level inside the press. This improves the vacuum stability inside the press, reduces the number of start-stop cycles of each vacuum pump in the pump assembly, extends their service life, and simultaneously reduces energy consumption and production costs.

Description

Technical Field

[0001] This application relates to the field of lamination equipment technology, and in particular to vacuum control systems and vacuum hot pressing equipment. Background Technology

[0002] Vacuum hot pressing equipment is required in the manufacturing process of printed circuit boards (PCBs). The lamination process within this equipment is a critical step, and the stability of the vacuum level within the equipment has a vital impact on the lamination quality. Existing vacuum hot pressing equipment suffers from frequent vacuum pump start-stop cycles, which not only shortens the pump's lifespan but also results in excessive energy consumption. Utility Model Content

[0003] Therefore, it is necessary to provide a vacuum control system to address the problem of frequent vacuum pump start-stop in existing vacuum hot pressing equipment, which not only shortens the service life of the vacuum pump but also causes excessive energy consumption.

[0004] A vacuum control system, comprising:

[0005] A pump body assembly, the pump body assembly including at least two vacuum pumps arranged in parallel, each of the vacuum pumps being connected to a compressor;

[0006] A tank assembly, comprising at least one vacuum tank, wherein the output end of the tank assembly is connected to the pump assembly and the input end of the tank assembly is connected to the compressor.

[0007] In one embodiment, the tank assembly includes at least two vacuum tanks arranged in parallel.

[0008] In one embodiment, the tank assembly further includes a one-way valve, which is provided on the pipeline connecting the output end of each vacuum tank to the pump assembly and / or on the pipeline connecting the input end of each vacuum tank to the compressor. The one-way valve is used to block reverse leakage between the vacuum tanks.

[0009] In one embodiment, the vacuum control system further includes a first pressure detector located on a conduit in communication with the tank assembly, the first pressure detector being used to detect the pressure value inside the tank assembly.

[0010] In one embodiment, the vacuum control system further includes:

[0011] A first switching valve is installed on the pipeline between the input end of the tank assembly and the press. The first switching valve is used to control the on / off connection between the input end of the tank assembly and the press.

[0012] A second switching valve is installed on the pipeline between the output end of the tank assembly and the pump assembly. The second switching valve is used to control the on / off connection between the output end of the tank assembly and the pump assembly.

[0013] In one embodiment, the vacuum control system further includes a controller, which is electrically connected to the first pressure detector, the first switching valve, and the second switching valve. The controller is used to control the opening or closing of the first switching valve and the second switching valve based on the pressure value information detected by the first pressure detector.

[0014] In one embodiment, the vacuum control system further includes a second pressure detector disposed on a pipeline for communication with the compressor, the second pressure detector being used to detect the pressure value inside the compressor.

[0015] In one embodiment, the vacuum control system further includes a pressure relief line and a third switching valve. The input end of the pressure relief line is used to connect with the compressor, and the output end of the pressure relief line is used to connect with the outside. The third switching valve is disposed on the pressure relief line and is used to control the connection between the input end of the pressure relief line and the compressor.

[0016] In one embodiment, the vacuum control system further includes a silencer disposed at the output end of the pressure relief line.

[0017] This application also provides a vacuum hot pressing device that can solve at least one of the above-mentioned technical problems.

[0018] A vacuum hot pressing device includes the aforementioned vacuum control system and a press.

[0019] Beneficial effects:

[0020] The vacuum control system provided in this application includes a pump assembly and a tank assembly. The pump assembly includes at least two vacuum pumps connected in parallel, each of which is connected to a compressor. The tank assembly includes at least one vacuum tank. The output end of the tank assembly is connected to the pump assembly, and the input end of the tank assembly is connected to the compressor. In this application, when the compressor is evacuated in the initial state, the vacuum pumps can be used to evacuate the compressor. Since the output end of the tank assembly is connected to the pump assembly, the vacuum pumps can act on the vacuum tank in the tank assembly to extract the gas from the vacuum tank, thus pre-storing negative pressure in the vacuum tank. When the pressure value inside the compressor reaches the target value, since the input end of the tank assembly is connected to the compressor, the vacuum pumps can be shut down. The vacuum level inside the compressor is maintained by the tank assembly to dynamically compensate for the vacuum level inside the compressor, thereby improving the vacuum stability inside the compressor. It can flexibly adapt to the needs of multi-stage processes, reduce the number of start-stop cycles of the vacuum pumps in the pump assembly, extend their service life, and reduce energy consumption and production costs. The pump assembly includes at least two vacuum pumps connected in parallel, which can achieve the required vacuum level more quickly, improve work efficiency, and at the same time, make the parallel vacuum pumps backups for each other, avoid the failure of a single vacuum pump, and improve the reliability of the vacuum control system.

[0021] This application also provides a vacuum hot pressing apparatus, including the aforementioned vacuum control system and a press. This vacuum hot pressing apparatus can achieve at least one of the aforementioned technical effects. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the cooperation between a vacuum control system and a compressor according to an embodiment of this application.

[0023] Figure 2 A schematic diagram of the vacuum control system and the compressor provided in another embodiment of the application.

[0024] Icon labels:

[0025] 110-Vacuum pump; 120-Fifth switching valve; 200-Tank assembly; 210-Vacuum tank; 220-Check valve; 230-First pressure detector; 240-First switching valve; 241-Valve body; 242-Control valve; 243-Gas source; 250-Second switching valve; 260-Connecting pipeline; 310-Compressor; 320-Second pressure detector; 330-Pressure relief pipeline; 340-Third switching valve; 350-Silencer; 360-Delivery pipeline; 370-Fourth switching valve. Detailed Implementation

[0026] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0027] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0032] See Figure 1 , Figure 1 This is a schematic diagram illustrating the cooperation between a vacuum control system and a compressor according to an embodiment of this application. The vacuum control system provided in one embodiment of this application includes a pump assembly and a tank assembly 200; the pump assembly includes at least two vacuum pumps 110 connected in parallel, each vacuum pump 110 being connected to a compressor 310; the tank assembly 200 includes at least one vacuum tank 210, the output end of the tank assembly 200 being connected to the pump assembly, and the input end of the tank assembly 200 being connected to the compressor 310.

[0033] Specifically, in this application, when the compressor 310 is evacuated in the initial state, the vacuum pump 110 can be used to evacuate the compressor 310. Since the output end of the tank assembly 200 is connected to the pump assembly, the vacuum pump 110 can act on the vacuum tank 210 in the tank assembly 200 to extract the gas in the vacuum tank 210, so that the vacuum tank 210 stores negative pressure. When the pressure value in the compressor 310 reaches the target value, since the input end of the tank assembly 200 is connected to the compressor 310, each vacuum pump 110 can be turned off. The vacuum degree in the compressor 310 is maintained by the tank assembly 200 to perform dynamic pressure compensation for the vacuum degree in the compressor 310, thereby improving the vacuum stability in the compressor 310, flexibly adapting to the needs of multi-stage processes, reducing the number of start-stop cycles of each vacuum pump 110 in the pump assembly, extending the service life, and reducing energy consumption and production costs.

[0034] The pump assembly includes at least two vacuum pumps 110 connected in parallel, which can achieve the required vacuum level more quickly and improve work efficiency. At the same time, the parallel vacuum pumps 110 serve as backups for each other, preventing the failure of a single vacuum pump 110 and improving the reliability of the vacuum control system.

[0035] See Figure 1 In one embodiment, the tank assembly 200 includes at least two vacuum tanks 210 arranged in parallel. By providing at least two vacuum tanks 210, the space for pre-stored negative pressure within the tank assembly 200 is increased, thereby enhancing the dynamic pressure compensation capability of the tank assembly 200 and further reducing the number of start-ups and shutdowns of the pump assembly.

[0036] See Figure 1 In one embodiment, the tank assembly 200 further includes a one-way valve 220. One-way valves 220 are provided on the pipelines connecting the output end of each vacuum tank 210 to the pump assembly and on the pipelines connecting the input end of each vacuum tank 210 to the compressor 310. The one-way valves 220 are used to block reverse leakage between each vacuum tank 210, thereby avoiding mutual interference between the parallel vacuum tanks 210 and improving the reliability of dynamic pressure compensation of the tank assembly 200.

[0037] Furthermore, the tank assembly 200 also includes a connecting pipe 260, through which each vacuum tank 210 is connected to the pump assembly and the compressor 310, and a one-way valve 220 is provided on the connecting pipe 260.

[0038] See Figure 1 In another embodiment, each one-way valve 220 is disposed on one side of the output end of the vacuum tank 210, thereby ensuring that the vacuum pump 110 extracts the air from each vacuum tank 210, so that each vacuum tank 210 stably stores negative pressure.

[0039] See Figure 2 , Figure 2 This is a schematic diagram illustrating the cooperation between the vacuum control system and the compressor provided in another embodiment of the application. In yet another embodiment, each one-way valve 220 is disposed on one side of the input end of the vacuum tank 210, thereby ensuring that each vacuum tank 210 provides dynamic pressure compensation for the vacuum level within the compressor 310, thereby improving the stability of the vacuum level within the compressor 310.

[0040] See Figure 1In one embodiment, the vacuum control system further includes a first pressure detector 230, located on a pipeline connected to the tank assembly 200. The first pressure detector 230 detects the pressure value within the tank assembly 200, thereby enabling real-time monitoring of the pressure value within the vacuum tank 210. When the pressure value within the empty tank exceeds a target value, the system can promptly control the connection between the vacuum tank 210 and the compressor 310, connecting the vacuum tank 210 to the pump assembly and the pump assembly to the compressor 310. This allows the pump assembly to provide negative pressure to the compressor 310 and replenish pressure to the vacuum tank 210, ensuring the stability of the vacuum level in the compressor 310. Preferably, the first pressure detector 230 is a pressure detector.

[0041] When the pressure value detected by the first pressure detector 230 in the vacuum tank 210 is lower than the target value, the connection between the vacuum tank 210 and the pump body assembly can be controlled to be disconnected in time, and the connection between the vacuum tank 210 and the compressor 310 can be controlled to perform dynamic pressure compensation.

[0042] Furthermore, the first pressure detector 230 is installed on the pipeline between the input end of the tank assembly 200 and the compressor 310, thereby reducing the amount of pipeline required and lowering the cost of the vacuum control system.

[0043] See Figure 1 In one embodiment, the vacuum control system further includes a first switching valve 240 and a second switching valve 250; the first switching valve 240 is disposed on the pipeline between the input end of the tank assembly 200 and the compressor 310, and the first switching valve 240 is used to control the on / off connection between the input end of the tank assembly 200 and the compressor 310; the second switching valve 250 is disposed on the pipeline between the output end of the tank assembly 200 and the pump assembly, and the second switching valve 250 is used to control the on / off connection between the output end of the tank assembly 200 and the pump assembly.

[0044] Specifically, by setting the first switching valve 240 and the second switching valve 250, the connection and disconnection between the output end of the tank assembly 200 and the pump assembly, as well as the connection and disconnection between the input end of the tank assembly 200 and the compressor 310, can be better controlled. This allows the vacuum tank 210 to provide stable dynamic pressure compensation for the vacuum in the compressor 310 and accurately replenish the pressure in the vacuum tank 210, thereby improving the reliability of the vacuum control system.

[0045] Furthermore, the first switching valve 240 includes a valve body 241, an air source 243, and a control valve 242. The valve body 241 is disposed on the pipeline between the output end of the tank assembly 200 and the pump assembly. The control valve 242 is connected to both the air source 243 and the valve body 241. The control valve 242 controls the air source 243 to control the valve body 241 to automatically open or close, thereby improving convenience. The structure of the second switching valve 250 is the same as that of the first switching valve 240, and therefore will not be described in detail.

[0046] See Figure 1 In one embodiment, the vacuum control system further includes a controller that is electrically connected to the first pressure detector 230, the first switching valve 240, and the second switching valve 250. The controller is used to control the opening or closing of the first switching valve 240 and the second switching valve 250 based on the pressure value information detected by the first pressure detector 230.

[0047] Specifically, the controller is electrically connected to the valve body 241 on the first switching valve 240 and the valve body 241 on the second switching valve 250. The first pressure detector 230 monitors the pressure value inside the vacuum tank 210 in real time and transmits the pressure value information inside the vacuum tank 210 to the controller, so that the controller can accurately control the opening or closing of the first switching valve 240 and the second switching valve 250 according to the pressure value information inside the vacuum tank 210, so as to ensure that the vacuum pump 110 or the vacuum tank 210 provides negative pressure to the compressor 310 in a timely manner, thereby improving the stability of the vacuum inside the compressor 310 and improving the reliability of the vacuum control system.

[0048] See Figure 1 In one embodiment, the vacuum control system further includes a second pressure detector 320, which is disposed on a pipeline for communicating with the compressor 310 and is used to detect the pressure value inside the compressor 310.

[0049] Specifically, the second pressure detector 320 is electrically connected to the controller. The second pressure detector 320 monitors the vacuum level inside the compressor 310 in real time and transmits the vacuum level information to the controller, enabling the controller to control the opening or closing of the first switching valve 240. This allows the vacuum tank 210 to provide negative pressure to the compressor 310 in a timely manner for dynamic pressure compensation, thereby improving the vacuum stability inside the compressor 310. Preferably, the second pressure detector 320 is a pressure sensor.

[0050] Furthermore, the vacuum control system also includes a delivery pipeline 360, through which the compressor 310 is connected to the vacuum pump 110 and the vacuum tank 210. A second pressure detector 320 is installed on the delivery pipeline 360, thereby reducing the number of pipelines and lowering the cost of the vacuum control system.

[0051] Furthermore, the vacuum control system also includes a fourth switching valve 370, which is disposed on the delivery pipeline 360. The fourth switching valve 370 is used to control the connection and disconnection between the compressor 310, the pump body, and the tank assembly 200. The fourth switching valve 370 is connected to the controller. When the vacuum level inside the compressor 310 is greater than the target value, the controller controls the fourth switching valve 370 to open, thereby supplementing the pressure through the vacuum tank 210. When the vacuum level inside the compressor 310 is less than the target value, the controller controls the fourth switching valve 370 to close. Preferably, the structure of the fourth switching valve 370 is the same as that of the first switching valve 240, and therefore will not be described further.

[0052] See Figure 1 In one embodiment, the vacuum control system further includes a pressure relief line 330 and a third switching valve 340. The input end of the pressure relief line 330 is used to connect with the compressor 310, and the output end of the pressure relief line 330 is used to connect with the outside. The third switching valve 340 is disposed on the pressure relief line 330 and is used to control the connection and disconnection between the input end of the pressure relief line 330 and the compressor 310.

[0053] Specifically, when the press 310 needs to release pressure after operation, the third switch valve 340 can be opened to connect the input end of the pressure relief pipeline 330 to the press 310, thereby connecting the press 310 to the outside environment for pressure relief and to ensure safety. The third switch valve 340 is electrically connected to the controller. Preferably, the structure of the third switch valve 340 is the same as that of the first switch valve 240, and therefore will not be described again. It should be noted that the third switch valve 340 is normally closed and only opens when the press 310 needs to release pressure; when the third switch valve 340 is open, the fourth switch valve 370 is closed.

[0054] Furthermore, the pressure relief line 330 is connected to the delivery line 360, which reduces the number of openings on the press 310 and improves the sealing performance of the press 310.

[0055] A fifth switching valve 120 is provided on the pipeline connecting the pump assembly to the compressor 310 and the tank assembly 200. The fifth switching valve 120 is used to control the opening and closing of the pipeline between the vacuum pump 110, the compressor 310, and the tank assembly 200. The fifth switching valve 120 is electrically connected to the controller. Preferably, the fifth switching valve 120 has the same structure as the first switching valve 240, so it will not be described in detail.

[0056] It should be noted that some switching valves can share a single air source 243, which simplifies the structure and reduces costs.

[0057] See Figure 1In one embodiment, the vacuum control system further includes a silencer 350, which is disposed at the output end of the pressure relief line 330, thereby reducing noise and improving the adaptability of the vacuum control system when the compressor 310 is depressurized.

[0058] See Figure 1 and Figure 2 This application also provides a vacuum hot pressing device, including the aforementioned vacuum control system and a press 310. In the initial state, when the press 310 is evacuated, a vacuum pump 110 can be used to evacuate the press 310. Since the output end of the tank assembly 200 is connected to the pump assembly, the vacuum pump 110 can act on the vacuum tank 210 in the tank assembly 200 to extract the gas from the vacuum tank 210, thus pre-storing negative pressure in the vacuum tank 210. When the pressure value inside the press 310 reaches the target value, since the input end of the tank assembly 200 is connected to the press 310, each vacuum pump 110 can be shut off. The tank assembly 200 maintains the vacuum level inside the press 310, providing dynamic pressure compensation for the vacuum level inside the press 310. This improves the vacuum stability inside the press 310, allows for flexible adaptation to multi-stage process requirements, reduces the number of start-stop cycles of each vacuum pump 110 in the pump assembly, extends service life, and reduces energy consumption and production costs. The pump assembly includes at least two vacuum pumps 110 connected in parallel, which can achieve the required vacuum level more quickly and improve work efficiency. At the same time, the parallel vacuum pumps 110 serve as backups for each other, preventing the failure of a single vacuum pump 110 and improving the reliability of the vacuum control system.

[0059] Furthermore, the number of presses 310 is at least two, and the presses 310 are arranged in parallel. In this application, the number of vacuum pumps 110 is at least two, thereby providing power to at least three presses 310, thus improving the adaptability of the vacuum hot pressing equipment. Each press 310 is equipped with a corresponding delivery pipeline 360, and each delivery pipeline 360 ​​is equipped with a corresponding fourth switching valve 370, a pressure relief pipeline 330, a third switching valve 340, and a silencer 350.

[0060] The specific procedure for vacuuming compressor 310 is as follows:

[0061] Preheating stage: Open the second switch valve 250, the fourth switch valve 370, and the fifth switch valve 120. Both vacuum pumps 110 are simultaneously activated to evacuate the compressor 310 and vacuum tank 210, increasing the vacuum level within the compressor 310 chamber. The vacuum tank 210 stores negative pressure until the vacuum level within the compressor 310 chamber exceeds the first target vacuum level. The vacuum level within the compressor 310 increases linearly to prevent material deformation within the compressor 310. The first target vacuum level can be 30 mbar.

[0062] Full pressure stage: When the vacuum level inside the compressor 310 is greater than the second target vacuum level, the vacuum pump 110, the fifth switching valve 120, the second switching valve 250, and the fourth switching valve 370 are shut down; when the vacuum level inside the compressor 310 is lower than the first target vacuum level, the first switching valve 240 and the fourth switching valve 370 are opened, and the vacuum tank 210 releases negative pressure to dynamically compensate for the pressure. The second target vacuum level can be 10 mbar.

[0063] Cooling stage: The vacuum level in the compressor 310 decreases gradually, and the vacuum tank 210 maintains the residual vacuum to prevent air from seeping in.

[0064] Pressing completion stage: Open switch valve 340 and close switch valve 470 at the same time, so that outside air can quickly enter the press chamber 310 to complete the depressurization of the press chamber.

[0065] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vacuum control system, characterized in that, The vacuum control system includes: A pump body assembly, the pump body assembly including at least two vacuum pumps arranged in parallel, each of the vacuum pumps being connected to a compressor; A tank assembly, comprising at least one vacuum tank, wherein the output end of the tank assembly is connected to the pump assembly and the input end of the tank assembly is connected to the compressor.

2. The vacuum control system according to claim 1, characterized in that, The tank assembly includes at least two vacuum tanks arranged in parallel.

3. The vacuum control system according to claim 2, characterized in that, The tank assembly also includes a one-way valve, which is provided on the pipeline connecting the output end of each vacuum tank to the pump assembly and / or on the pipeline connecting the input end of each vacuum tank to the compressor. The one-way valve is used to block reverse leakage between the vacuum tanks.

4. The vacuum control system according to claim 1, characterized in that, The vacuum control system further includes a first pressure detector located on a pipeline connected to the tank assembly, and the first pressure detector is used to detect the pressure value inside the tank assembly.

5. The vacuum control system according to claim 4, characterized in that, The vacuum control system also includes: A first switching valve is installed on the pipeline between the input end of the tank assembly and the press. The first switching valve is used to control the on / off connection between the input end of the tank assembly and the press. A second switching valve is installed on the pipeline between the output end of the tank assembly and the pump assembly. The second switching valve is used to control the on / off connection between the output end of the tank assembly and the pump assembly.

6. The vacuum control system according to claim 5, characterized in that, The vacuum control system further includes a controller, which is electrically connected to the first pressure detector, the first switching valve, and the second switching valve. The controller is used to control the opening or closing of the first switching valve and the second switching valve based on the pressure value information detected by the first pressure detector.

7. The vacuum control system according to any one of claims 1-6, characterized in that, The vacuum control system further includes a second pressure detector, which is disposed on a pipeline connected to the compressor and is used to detect the pressure value inside the compressor.

8. The vacuum control system according to claim 7, characterized in that, The vacuum control system also includes a pressure relief pipeline and a third switching valve. The input end of the pressure relief pipeline is used to connect with the compressor, and the output end of the pressure relief pipeline is used to connect with the outside. The third switching valve is located on the pressure relief pipeline and is used to control the connection between the input end of the pressure relief pipeline and the compressor.

9. The vacuum control system according to claim 8, characterized in that, The vacuum control system also includes a silencer, which is located at the output end of the pressure relief pipeline.

10. A vacuum hot pressing device, characterized in that, The system includes the vacuum control system according to any one of claims 1-9, and also includes a compressor.

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