Compressed air automatic air supply device

Abstract

The utility model relates to an automatic compressed air supply device which is characterized in that a first screw air compressor is communicated with a first compressed air storage tank through a first pipeline, an air inlet of a second pipeline is communicated with the first pipeline, an air outlet of the second pipeline is communicated with a second compressed air storage tank, and an air inlet of a third pipeline is communicated with the second pipeline; an air outlet of the third pipeline is communicated with a third compressed air storage tank, the first control valve is installed on the second pipeline, and the second control valve is installed on the third pipeline; the control module is in communication connection with the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the first control valve and the second control valve. The control module is used for controlling the opening degree of the first control valve and / or the second control valve according to pressure data detected by the first pressure transmitter, the second pressure transmitter and the third pressure transmitter. By calculating the excess air amount of the compressed air storage tank, the excess air amount is supplied to the compressed air storage tank of the next pressure grade and used by the compressed air storage tank of the low pressure, and self-control pressure-stabilizing air supply is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pressure air air supply, particularly relates to a pressure air automatic air supply device. BACKGROUND

[0002] In the field of chemical fibers, basically use more than three different pressure levels of compressed air as the precise control of process, equipment air, especially terminal process air, requires pressure accuracy to reach within ±0.05MPa.

[0003] As shown in the figure, the existing mainly uses manual adjustment pressure reducing valve to realize pressure control, through higher pressure level pressure reduction to low level pressure supply system for use. Figure 1 But in use, manual adjustment pressure reducing valve will cause flow fluctuation due to time difference and adjustment accuracy, thereby affecting pressure stability. SUMMARY

[0004] In view of the above problem, the application provides a pressure air automatic air supply device, which is used to solve the technical problem of flow fluctuation caused by time difference and adjustment accuracy in use, thereby affecting pressure stability.

[0005] To achieve the above purpose, the inventor provides a pressure air automatic air supply device, which comprises:

[0006] The tank assembly comprises a first pressure air storage tank, a second pressure air storage tank and a third pressure air storage tank with pressure levels from high to low, a first pressure transmitter, a second pressure transmitter and a third pressure transmitter, the first pressure transmitter is connected with the first pressure air storage tank, the second pressure transmitter is connected with the second pressure air storage tank, and the third pressure transmitter is connected with the third pressure air storage tank;

[0007] The air compression assembly comprises a first screw air compressor;

[0008] The pipeline assembly comprises a first pipeline, a second pipeline, a third pipeline, a first control valve and a second control valve, the first screw air compressor is connected with the first pressure air storage tank through the first pipeline, the gas inlet of the second pipeline is connected with the first pipeline, the gas outlet of the second pipeline is connected with the second pressure air storage tank, the gas inlet of the third pipeline is connected with the second pipeline, the gas outlet of the third pipeline is connected with the third pressure air storage tank, the first control valve is installed on the second pipeline, and the second control valve is installed on the third pipeline;

[0009] A control module is in communication connection with the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the first control valve and the second control valve, and is configured to control the opening degree of the first control valve and / or the second control valve according to the pressure data detected by the first pressure transmitter, the second pressure transmitter and the third pressure transmitter.

[0010] Compared with the prior art, the technical scheme of the present application is provided with the first control valve and the second control valve, which are in communication connection with the control module, and the control module controls the opening degree of the first control valve and / or the second control valve according to the pressure data of the pressure tank detected by the pressure transmitter, and the excess gas of each pressure tank is supplied to the next pressure tank, and the excess gas is supplied to the low-pressure pressure tank, so that the self-control stable pressure compensation is realized, thereby avoiding the problem of flow fluctuation caused by artificial control and affecting the pressure stability.

[0011] As an embodiment of the present application, the air pressure automatic compensation device further comprises an alarm assembly corresponding to the tank body assembly, the alarm assembly comprises a first alarm, a second alarm and a third alarm, and the control module is in communication connection with the first alarm, the second alarm and the third alarm.

[0012] Therefore, the first alarm is arranged to limit the low limit pressure of the first pressure tank, the second alarm is arranged to limit the low limit pressure of the second pressure tank, and the third alarm is arranged to limit the low limit pressure of the third pressure tank, and when the pressure tank is lower than the corresponding low limit pressure, the corresponding alarm sends an alarm, and the control module controls the opening degree of the corresponding control valve according to the alarm.

[0013] As an embodiment of the present application, the air compression assembly further comprises a second centrifugal air compressor, which is in communication connection with the second pipeline.

[0014] Therefore, the second centrifugal air compressor is arranged to additionally compensate the second pressure tank and the third pressure tank, thereby ensuring normal compensation.

[0015] As an embodiment of the present application, the air compression assembly further comprises a third centrifugal air compressor, which is in communication connection with the third pipeline.

[0016] Therefore, the third centrifugal air compressor is arranged to additionally compensate the third pressure tank, thereby ensuring normal compensation.

[0017] As an embodiment of the present application, the pipeline assembly further comprises a first stop valve and a second stop valve installed on the second pipeline, the first stop valve is located between the air inlet of the second pipeline and the first control valve, and the second stop valve is located between the first control valve and the air outlet of the second pipeline.

[0018] Thus, by setting the stop valve, the flow, pressure and flow rate of the gas in the second pipeline can be changed, thereby realizing the control and adjustment of the gas.

[0019] As an embodiment of the present application, the pipeline assembly further comprises a first pressure gauge, a second pressure gauge and a third stop valve installed on the second pipeline, the first pressure gauge is located between the gas inlet of the second pipeline and the first stop valve, the second pressure gauge is located between the second stop valve and the gas outlet of the second pipeline, and the first pressure gauge and the second pressure gauge are cut off by the third stop valve.

[0020] Thus, the first pressure gauge and the second pressure gauge can display the pressure changes before and after the control of the first control valve in real time, and the third stop valve can prevent the pressure gauges from affecting each other.

[0021] As an embodiment of the present application, the pipeline assembly further comprises a fourth stop valve and a fifth stop valve installed on the third pipeline, the fourth stop valve is located between the gas inlet of the third pipeline and the second control valve, and the fifth stop valve is located between the second control valve and the gas outlet of the third pipeline.

[0022] Thus, by setting the stop valve, the flow, pressure and flow rate of the gas in the third pipeline can be changed, thereby realizing the control and adjustment of the gas.

[0023] As an embodiment of the present application, the pipeline assembly further comprises a third pressure gauge, a fourth pressure gauge and a sixth stop valve installed on the third pipeline, the third pressure gauge is located between the gas inlet of the third pipeline and the fourth stop valve, the fourth pressure gauge is located between the fifth stop valve and the gas outlet of the third pipeline, and the third pressure gauge and the fourth pressure gauge are cut off by the sixth stop valve.

[0024] Thus, the third pressure gauge and the fourth pressure gauge can display the pressure changes before and after the control of the second control valve in real time, and the sixth stop valve can prevent the pressure gauges from affecting each other.

[0025] As an embodiment of the present application, the tank assembly further comprises a fifth pressure gauge, a sixth pressure gauge and a seventh pressure gauge, the fifth pressure gauge is connected with the first pressure transmitter, the sixth pressure gauge is connected with the second pressure transmitter, and the seventh pressure gauge is connected with the third pressure transmitter.

[0026] Thus, by connecting the pressure gauges with the pressure transmitters, the pressure changes of the pressure transmitters can be displayed more intuitively.

[0027] As an embodiment of the present application, the compressed air automatic air supplementing device further comprises a host computer, and the host computer is in communication connection with the control module.

[0028] In this way, the control situation of the control module can be monitored or observed in real time by setting the host computer staff.

[0029] The above content related to the description of the utility model is only a summary of the technical scheme of the present application, in order to enable those skilled in the art to more clearly understand the technical scheme of the present application, and then can be implemented according to the content of the description and the drawings, and in order to let the above-mentioned purpose and other purposes, characteristics and advantages of the present application can be more easily understood, the following is described in conjunction with the specific embodiments of the present application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0030] The drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as the limitation of the present application.

[0031] In the drawings of the specification:

[0032] Figure 1 It is a structural schematic diagram of the pressure air supplementing device in the background art;

[0033] Figure 2 It is a structural schematic diagram of the pressure air automatic supplementing device of one embodiment of the present application Figure 1 ;

[0034] Figure 3 It is a structural schematic diagram of the pressure air automatic supplementing device of one embodiment of the present application Figure 2 ;

[0035] Figure 4 It is a structural schematic diagram of the pressure air automatic supplementing device of one embodiment of the present application Figure 3 ;

[0036] Figure 5 It is a structural schematic diagram of the pressure air automatic supplementing device of one embodiment of the present application Figure 4 .

[0037] The reference signs involved in the above drawings are explained as follows:

[0038] 100 - automatic air pressure supplement device; 1 - tank assembly; 11 - first air pressure storage tank; 12 - second air pressure storage tank; 13 - third air pressure storage tank; 14 - first pressure transmitter; 15 - second pressure transmitter; 16 - third pressure transmitter; 17 - fifth pressure gauge; 18 - sixth pressure gauge; 19 - seventh pressure gauge; 2 - air compression assembly; 21 - first screw air compressor; 22 - second centrifugal air compressor; 23 - third centrifugal air compressor; 3 - pipeline assembly; 31 - first pipeline; 32 - second pipeline; 321 - first stop valve; 322 - second stop valve; 323 - third stop valve; 33 - third pipeline; 331 - fourth stop valve; 332 - fifth stop valve; 333 - sixth stop valve; 34 - first control valve; 35 - second control valve; 36 - first pressure gauge; 37 - second pressure gauge; 38 - third pressure gauge; 39 - fourth pressure gauge; 4 - control module. DETAILED DESCRIPTION

[0039] To make the possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved of the present application clear, the following will be described in detail in combination with the specific embodiments listed and the accompanying drawings. The embodiments described in the present document are only used to make the technical solutions of the present application clearer, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0040] In the present document, the term "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0041] Unless otherwise defined, the meanings of the technical terms used in the present document are the same as those commonly understood by those skilled in the art to which the present application belongs; the use of related terms in the present document is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0042] In the description of the present application, the phrase "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in the present document generally represents that the associated objects before and after are a "or" logical relationship.

[0043] In the present application, the terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, primary or secondary, or order relationship between the entities or operations.

[0044] In the present application, the "includes", "contains", "has", or other similar expressions used in the statements are intended to cover non-exclusive inclusion, and do not exclude the presence of additional elements in the process, method or product comprising the elements, so that the process, method or product comprising a series of elements can not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0045] As the same understanding as in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times", etc., unless otherwise explicitly specified.

[0046] In the description of the embodiments of the present application, the spatial-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or position relationship is based on the orientation or position relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0047] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", etc. should be understood broadly. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] According to some embodiments of the present application, please refer to Figures 2 to 5 The present embodiment relates to an automatic air pressure supplementing device 100, comprising a tank assembly 1, an air compressor assembly 2, a pipeline assembly 3 and a control module 4. The tank assembly 1 comprises a first compressed air tank 11, a second compressed air tank 12 and a third compressed air tank 13 with pressure levels from high to low, a first pressure transmitter 14, a second pressure transmitter 15 and a third pressure transmitter 16. The first pressure transmitter 14 is connected to the first compressed air tank 11, the second pressure transmitter 15 is connected to the second compressed air tank 12, and the third pressure transmitter 16 is connected to the third compressed air tank 13. The air compressor assembly 2 comprises a first screw air compressor 21. The pipeline assembly 3 comprises a first pipeline 31, a second pipeline 32, a third pipeline 33, a first control valve 34 and a second control valve 35. The first screw air compressor 21 is connected to the first compressed air tank 11 through the first pipeline 31. The air inlet of the second pipeline 32 is connected to the first pipeline 31, and the air outlet of the second pipeline 32 is connected to the second compressed air tank 12. The air inlet of the third pipeline 33 is connected to the second pipeline 32, and the air outlet of the third pipeline 33 is connected to the third compressed air tank 13. The first control valve 34 is installed on the second pipeline 32, and the second control valve 35 is installed on the third pipeline 33. The control module 4 is communicatively connected to the first pressure transmitter 14, the second pressure transmitter 15, the third pressure transmitter 16, the first control valve 34 and the second control valve 35. The control module 4 is configured to control the opening degree of the first control valve 34 and / or the second control valve 35 according to the pressure data detected by the first pressure transmitter 14, the second pressure transmitter 15 and the third pressure transmitter 16.

[0049] In the present embodiment, the first compressed air tank 11 stores 1.2 MPa compressed air, the second compressed air tank 12 stores 0.8 MPa compressed air, and the third compressed air tank 13 stores 0.5 MPa compressed air. The corresponding pressure transmitter (a device that converts pressure into pneumatic or electric signals for control and transmission) is set to the low limit pressure, the adjustment limit and the high limit pressure of the corresponding compressed air tank. The control module 4 mainly controls the opening degree of the first control valve 34 and / or the second control valve 35 according to the low limit pressure of the compressed air tank, so that the compressed air tank reaches the adjustment limit. The specific values are as follows:

[0050]

[0051] The first control valve 34 and the second control valve 35 are controlled by PLC. In actual use, the first screw air compressor 21 (displacement 50.6 m 3The first screw air compressor 21 is connected with the control module 4, and the control module 4 controls the first screw air compressor 21 to start according to actual conditions. In some embodiments, the first screw air compressor 21 can be provided with multiple sets, and in the embodiment, the first screw air compressor 21 is provided with four sets.

[0052] The technical scheme of the present application is provided with the first control valve 34 and the second control valve 35, which are connected with the control module 4 in communication. The control module 4 controls the opening degree of the first control valve 34 and / or the second control valve 35 according to the pressure data of the pressure air storage tank detected by the pressure transmitter. The excess air quantity of each pressure air storage tank is calculated, and the excess air quantity is supplied to the next pressure level pressure air storage tank for use by the low-pressure pressure air storage tank, so as to realize self-control and stable pressure air supply. Thus, the problem of flow fluctuation caused by artificial control and affecting pressure stability can be avoided.

[0053] According to some embodiments of the present application, the pressure air automatic air supply device 100 further comprises an alarm assembly corresponding to the tank body assembly 1, the alarm assembly comprising a first alarm, a second alarm and a third alarm, and the control module 4 is further connected with the first alarm, the second alarm and the third alarm in communication.

[0054] Therefore, the first alarm is arranged to limit the low limit pressure of the first pressure air storage tank 11, the second alarm is arranged to limit the low limit pressure of the second pressure air storage tank 12, and the third alarm is arranged to limit the low limit pressure of the third pressure air storage tank 13. When the pressure air storage tank is lower than the corresponding low limit pressure, the corresponding alarm issues an alarm, and the control module 4 controls the opening degree of the corresponding control valve according to the issued alarm. Optionally, the alarm is a buzzer.

[0055] According to some embodiments of the present application, as shown in Figures 3 to 5 The air compression assembly 2 further comprises a second centrifugal air compressor 22, and the second centrifugal air compressor 22 is connected with the second pipeline 32 in communication.

[0056] The communication point of the second centrifugal air compressor 22 and the second pipeline 32 is located between the first control valve 34 and the gas outlet of the second pipeline 32.

[0057] Therefore, by arranging the second centrifugal air compressor 22 (the flow rate is 220 Nm 3The second centrifugal air compressor 22 can additionally supply air to the second compressed air storage tank 12 and the third compressed air storage tank 13 to ensure normal air supply. In some embodiments, the second centrifugal air compressor 22 can be provided with multiple units, and in this embodiment, the second centrifugal air compressor 22 is provided with three units. In other embodiments, the second centrifugal air compressor 22 is also in communication with the control module 4, and the control module 4 controls the start of the second centrifugal air compressor 22 according to actual conditions.

[0058] According to some embodiments of the present application, as shown in Figures 3 to 5 The air compressor assembly 2 further comprises a third centrifugal air compressor 23, which is connected to the third pipeline 33.

[0059] The communication point of the third centrifugal air compressor 23 and the third pipeline 33 is located between the second control valve 35 and the air outlet of the third pipeline 33.

[0060] In this way, by providing the third centrifugal air compressor 23 (flow rate: 220 Nm 3 / min) can additionally supply air to the third compressed air storage tank 13 to ensure normal air supply. In some embodiments, the third centrifugal air compressor 23 can be provided with multiple units, and in this embodiment, the third centrifugal air compressor 23 is provided with four units. In other embodiments, the third centrifugal air compressor 23 is also in communication with the control module 4, and the control module 4 controls the start of the third centrifugal air compressor 23 according to actual conditions.

[0061] According to some embodiments of the present application, as shown in Figure 4 and Figure 5 The pipeline assembly 3 further comprises a first stop valve 321 and a second stop valve 322 installed on the second pipeline 32, the first stop valve 321 is located between the air inlet of the second pipeline 32 and the first control valve 34, and the second stop valve 322 is located between the first control valve 34 and the air outlet of the second pipeline 32.

[0062] In this way, by providing the stop valve, the flow rate, pressure and flow rate of the gas in the second pipeline 32 can be changed to achieve control and adjustment of the gas. In some embodiments, the first stop valve 321 and the second stop valve 322 are also in communication with the control module 4, and the control module 4 controls them uniformly.

[0063] According to some embodiments of the present application, as shown in Figure 5 The pipeline assembly 3 further comprises a first pressure gauge 36, a second pressure gauge 37 and a third stop valve 323 installed on the second pipeline 32, the first pressure gauge 36 is located between the air inlet of the second pipeline 32 and the first stop valve 321, the second pressure gauge 37 is located between the second stop valve 322 and the air outlet of the second pipeline 32, and the first pressure gauge 36 and the second pressure gauge 37 are cut off by the third stop valve 323.

[0064] Thus, the first pressure gauge 36 and the second pressure gauge 37 can display the changes of the front and rear pressures after the control of the first control valve 34 in real time, and the third stop valve 323 can avoid the mutual influence between the pressure gauges. In some embodiments, the first pressure gauge 36, the second pressure gauge 37, and the third stop valve 323 can also be communicatively connected with the control module 4 and be uniformly controlled by the control module 4.

[0065] According to some embodiments of the present application, as shown in Figure 4 and Figure 5 The pipe assembly 3 further includes a fourth stop valve 331 and a fifth stop valve 332 installed on the third pipe 33, the fourth stop valve 331 is located between the air inlet of the third pipe 33 and the second control valve 35, and the fifth stop valve 332 is located between the second control valve 35 and the air outlet of the third pipe 33.

[0066] Thus, the fourth stop valve 331 and the fifth stop valve 332 can change the flow, pressure, and flow rate of the gas in the third pipe 33, so as to realize the control and adjustment of the gas. In some embodiments, the fourth stop valve 331 and the fifth stop valve 332 can also be communicatively connected with the control module 4 and be uniformly controlled by the control module 4.

[0067] According to some embodiments of the present application, as shown in Figure 5 The pipe assembly 3 further includes a third pressure gauge 38, a fourth pressure gauge 39, and a sixth stop valve 333 installed on the third pipe 33, the third pressure gauge 38 is located between the air inlet of the third pipe 33 and the fourth stop valve 331, the fourth pressure gauge 39 is located between the fifth stop valve 332 and the air outlet of the third pipe 33, and the third pressure gauge 38 and the fourth pressure gauge 39 are cut off by the sixth stop valve 333.

[0068] Thus, the third pressure gauge 38 and the fourth pressure gauge 39 can display the changes of the front and rear pressures after the control of the second control valve 35 in real time, and the sixth stop valve 333 can avoid the mutual influence between the pressure gauges. In some embodiments, the third pressure gauge 38, the fourth pressure gauge 39, and the sixth stop valve 333 can also be communicatively connected with the control module 4 and be uniformly controlled by the control module 4.

[0069] According to some embodiments of the present application, as shown in Figure 4 and Figure 5 The tank assembly 1 further includes a fifth pressure gauge 17, a sixth pressure gauge 18, and a seventh pressure gauge 19, the fifth pressure gauge 17 is connected with the first pressure transmitter 14, the sixth pressure gauge 18 is connected with the second pressure transmitter 15, and the seventh pressure gauge 19 is connected with the third pressure transmitter 16.

[0070] The fifth pressure gauge 17 and the first pressure transmitter 14 areFigure 5 PP1, the sixth pressure gauge 18 plus the second pressure transmitter 15 are Figure 5 PP2, the seventh pressure gauge 19 plus the third pressure transmitter 16 are Figure 5 PP3 in the diagram. In some embodiments, the fifth pressure gauge 17, the sixth pressure gauge 18, and the seventh pressure gauge 19 can also be communicatively connected to the control module 4 and controlled by the control module 4.

[0071] Therefore, by connecting a pressure gauge to the pressure transmitter, the pressure changes of the pressure transmitter can be displayed more intuitively.

[0072] According to some embodiments of this application, optionally, the automatic compressed air replenishment device 100 also includes a host computer, which is communicatively connected to the control module 4.

[0073] Thus, by setting up a host computer, staff can monitor or observe the control status of control module 4 in real time. The host computer can be a control center or a computer, etc.

[0074] The working principle of the automatic compressed air replenishment device 100 is as follows:

[0075] The first scenario involves a low-pressure alarm triggered by the 1.2MPa compressed air storage tank. Under normal production operation, when PP1 displays a pressure below 1.0MPa (the first alarm sounds), control module 4 communicates with the operator via the host computer, requesting the immediate activation of the backup unit to increase the air supply (the first alarm stops when the tank pressure exceeds 1.0MPa). The operator quickly starts the unit to increase the air supply.

[0076] The second method involves the 0.8MPa compressed air storage tank issuing a low-pressure alarm. When PP2 displays a pressure below 0.73MPa (the third alarm sounds), control module 4 sends a command to the first control valve 34 based on the difference between the monitored value and the low-limit pressure value. The PLC on the first control valve 34 quickly calculates and opens the first control valve 34 to a certain opening degree to replenish air to the 0.8MPa compressed air storage tank (the third alarm stops when the pressure inside the tank exceeds 0.73MPa). When the pressure inside the 0.8MPa compressed air storage tank reaches 0.78MPa, the first control valve 34 automatically closes to stop replenishing air.

[0077] The third method involves a low-pressure alarm issued by the 0.5MPa compressed air storage tank. When the pressure displayed by PP3 is below 0.43MPa (the second alarm sounds), the control module 4 sends a command to the second control valve 35 based on the difference between the monitored value and the low-limit pressure value. The PLC on the second control valve 35 quickly calculates and opens the second control valve 35 to a certain opening degree to replenish air to the 0.5MPa compressed air storage tank (the second alarm stops when the pressure inside the tank is above 0.43MPa). When the pressure inside the 0.5MPa compressed air storage tank reaches 0.48MPa, the second control valve 35 automatically closes to stop replenishing air.

[0078] Fourthly, when all the 1.2 MPa screw air compressors are running at full load (in this embodiment, four screw air compressors are running), but the first alarm, the second alarm or the third alarm is still ringing, the following operation is performed:

[0079] 1) When the first alarm is ringing, it indicates that the demand for 0.8 MPa air is large, and the 1.2 MPa air is not enough to supplement, causing the 1.2 MPa air tank to lose pressure. The operator quickly opens the second centrifugal air compressor 22 for large flow air supplement, and closes the first control valve 34 at the same time. The second control valve 35 is still open, and the 0.8 MPa continues to supplement the 0.5 MPa air tank.

[0080] 2) When the second alarm is not ringing and the third alarm is ringing, it indicates that the demand for 0.5 MPa air is large. The operator quickly opens the third centrifugal air compressor 23 for large flow air supplement, and closes the second control valve 35 at the same time. The first control valve 34 is still open, and the 1.2 MPa continues to supplement the 0.8 MPa air tank.

[0081] 3) When both the second alarm and the third alarm are ringing, it indicates that the demand for 0.5 MPa air is too large, and the 0.8 MPa air is sucked away too much. The control module 4 sends a closing instruction to the second control valve 35. The operator quickly opens the third centrifugal air compressor 23 for large flow air supplement. At the same time, the control module 4 sends an instruction to the first control valve 34 to supplement the 0.8 MPa air tank from the 1.2 MPa.

[0082] Those skilled in the art will understand that although some embodiments herein include certain features not included in other embodiments, the combination of features of different embodiments means to be within the scope of the present application and forms different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A compressed air automatic air supplementing device characterized by comprising: The application relates to an air pressure automatic supplementing device. The tank body assembly comprises a first pressure air storage tank, a second pressure air storage tank and a third pressure air storage tank with pressure levels from high to low, a first pressure transmitter, a second pressure transmitter and a third pressure transmitter, the first pressure transmitter being connected with the first pressure air storage tank, the second pressure transmitter being connected with the second pressure air storage tank, and the third pressure transmitter being connected with the third pressure air storage tank. The air pressure assembly comprises a first screw air compressor. The pipeline assembly comprises a first pipeline, a second pipeline, a third pipeline, a first control valve and a second control valve, the first screw air compressor being connected with the first pressure air storage tank through the first pipeline, an air inlet of the second pipeline being connected with the first pipeline, an air outlet of the second pipeline being connected with the second pressure air storage tank, an air inlet of the third pipeline being connected with the second pipeline, an air outlet of the third pipeline being connected with the third pressure air storage tank, the first control valve being installed on the second pipeline, and the second control valve being installed on the third pipeline. The control module is in communication connection with the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the first control valve and the second control valve, and is used for controlling the opening degree of the first control valve and / or the second control valve according to pressure data detected by the first pressure transmitter, the second pressure transmitter and the third pressure transmitter.

2. The compressed air automatic air supplementing device according to claim 1, characterized by The air pressure automatic supplementing device further comprises an alarm assembly corresponding to the tank body assembly, the alarm assembly comprising a first alarm, a second alarm and a third alarm, and the control module is in communication connection with the first alarm, the second alarm and the third alarm.

3. The compressed air automatic air supplementing device according to claim 1, characterized by The air pressure assembly further comprises a second centrifugal air compressor connected with the second pipeline.

4. The compressed air automatic air supplementing device according to claim 1, wherein The air pressure assembly further comprises a third centrifugal air compressor connected with the third pipeline.

5. The compressed air automatic air supplementing device according to claim 1, wherein The pipeline assembly further comprises a first stop valve and a second stop valve installed on the second pipeline, the first stop valve being located between the air inlet of the second pipeline and the first control valve, and the second stop valve being located between the first control valve and the air outlet of the second pipeline.

6. The compressed air automatic air supplementing device according to claim 5, wherein The pipeline assembly further comprises a first pressure gauge, a second pressure gauge and a third stop valve installed on the second pipeline, the first pressure gauge being located between the air inlet of the second pipeline and the first stop valve, the second pressure gauge being located between the second stop valve and the air outlet of the second pipeline, and the first pressure gauge and the second pressure gauge being cut off through the third stop valve.

7. The compressed air automatic air supplementing device according to claim 1, wherein The pipeline assembly further comprises a fourth stop valve and a fifth stop valve installed on the third pipeline, the fourth stop valve being located between the air inlet of the third pipeline and the second control valve, and the fifth stop valve being located between the second control valve and the air outlet of the third pipeline.

8. The compressed air automatic air supplementing device according to claim 7, wherein The pipeline assembly further comprises a third pressure gauge, a fourth pressure gauge and a sixth stop valve installed on the third pipeline, the third pressure gauge is located between the air inlet of the third pipeline and the fourth stop valve, the fourth pressure gauge is located between the fifth stop valve and the air outlet of the third pipeline, and the third pressure gauge and the fourth pressure gauge are cut off through the sixth stop valve.

9. The compressed air automatic air supplementing device according to claim 1, wherein The tank body assembly further comprises a fifth pressure gauge, a sixth pressure gauge and a seventh pressure gauge, the fifth pressure gauge is connected with the first pressure transmitter, the sixth pressure gauge is connected with the second pressure transmitter, and the seventh pressure gauge is connected with the third pressure transmitter.

10. The compressed air automatic air supplementing device according to claim 1, wherein The compressed air automatic air supplementing device further comprises a host computer, and the host computer is in communication connection with the control module.

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