Intelligent control structure and method for pressure difference and air volume of negative pressure isolator

Abstract

The negative pressure isolator pressure difference and air volume intelligent control structure comprises a filter, an air inlet of the filter is connected with a ventilation pipeline, an air inlet pressure testing device is arranged at the pipe opening position, away from the air inlet of the filter, of the ventilation pipeline, and the air inlet pressure testing device is used for measuring air pressure in the ventilation pipeline. An air volume adjusting valve is arranged at the position of the ventilation pipeline and used for adjusting the air inlet volume in the channel pipeline, the negative pressure isolator is installed on the exhaust pipeline through a draught fan, negative pressure is formed in the cavity through exhaust, and the negative pressure is formed through the cavity so that external air can enter the cavity through the ventilation pipeline; according to the scheme, the change of the air volume can be fed back in real time through the air inlet pressure measuring device, when the cleanliness requirement is low and the air volume requirement is small, the pressure and the air volume of the cavity can be guaranteed by lowering the opening degree of the adjusting valve and reducing the frequency of the fan, and when the cleanliness requirement is high, the air volume is reduced. The pressure and the air volume of the cavity can be ensured by increasing the opening degree of the adjusting valve or increasing the frequency of the fan.

Description

Technical Field

[0001] The present application relates to the technical field of negative pressure isolators, and in particular to a structure and method for intelligently controlling pressure difference and air volume of a negative pressure isolator. Background Art

[0002] The working pressure of the common negative pressure isolators on the market is mainly adjusted by the frequency conversion of the exhaust fan. The cleanliness level is mainly guaranteed by ensuring that the air inlet opening is large enough to ensure a sufficient number of air changes. It belongs to the high-low configuration. The impact it brings is that the equipment has a large air intake, which causes large room pressure fluctuations in the external clean room, increases the emission of clean air in the clean room outside the equipment, and increases the energy consumption of air conditioning. A sufficiently large air intake area makes it necessary to increase the energy consumption of the exhaust fan in order to achieve the required pressure inside the isolator. Summary of the Invention

[0003] In order to overcome the above shortcomings, the purpose of this application is to provide a negative pressure isolator pressure difference and air volume intelligent control structure and method, so as to effectively solve the above technical problems.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions: In the first aspect, the present application provides a negative pressure isolator pressure difference and air volume intelligent control structure, including a filter, the air inlet of the filter is connected to the ventilation duct, the ventilation duct is provided with an air inlet pressure testing device at the pipe mouth away from the air inlet of the filter, the air inlet pressure testing device is used to measure the wind pressure in the ventilation duct, the ventilation duct is provided with an air volume regulating valve, the air volume regulating valve is used to adjust the air intake volume in the channel pipe, the negative pressure isolator is installed in the exhaust duct through a fan, and a negative pressure is formed in the cavity by exhausting the air, and the negative pressure formed in the cavity allows the outside air to enter the cavity through the ventilation duct.

[0005] Furthermore, the air inlet pressure testing device includes a pagoda connector, a pressure transmitter and a pressure stabilizing ring, one end of the pagoda connector is connected to the pressure transmitter, and the other end of the pagoda connector is connected to the pressure stabilizing ring, and the pressure stabilizing ring is arranged in the ventilation duct.

[0006] Furthermore, the pressure stabilizing ring is a circular ring structure, and the pressure stabilizing ring surrounds the inner wall surface of the ventilation duct and is attached to the inner wall surface of the ventilation duct.

[0007] In a second aspect, the present application provides a method for intelligently controlling the pressure difference and air volume of a negative pressure isolator, comprising the following steps: The internal pressure value T of the negative pressure isolator cavity is preset, and the cleanliness requirement P of the negative pressure isolator is preset. Control the air volume regulating valve to open to 50%, turn on the fan, test the air inlet pressure in the ventilation duct through the air inlet pressure test device, and adjust the opening of the fan and air volume regulating valve to make the pressure inside the cavity reach the set value T. Test the working cleanliness of the negative pressure isolator, compare the real-time working cleanliness of the negative pressure isolator with the preset value P, and adjust the valve opening of the air volume control valve and the frequency of the fan according to the comparison result to make the real-time working cleanliness of the negative pressure isolator reach the preset value P, and in this process always keep the pressure inside the negative pressure isolator cavity at T. Through the above operations, the cavity pressure and cavity cleanliness both reach the requirements. At this time, the pressure value measured by the pressure testing device in the ventilation duct and the pressure value in the cavity are written into the automatic program.

[0008] Furthermore, adjusting the valve opening of the air volume regulating valve and the frequency of the fan according to the comparison results includes increasing the valve opening of the air volume regulating valve and increasing the frequency of the fan when the real-time cleanliness of the negative pressure isolator is lower than the preset value P, maintaining the internal pressure of the negative pressure isolator cavity unchanged, and increasing the air intake until the real-time cleanliness of the negative pressure isolator reaches the preset value P.

[0009] Furthermore, adjusting the valve opening of the air volume regulating valve and the frequency of the fan according to the comparison results includes reducing the valve opening of the air volume regulating valve and lowering the frequency of the fan when the real-time cleanliness of the negative pressure isolator is higher than the preset value P, maintaining the internal cavity pressure of the negative pressure isolator unchanged, and reducing the air intake until the real-time cleanliness of the negative pressure isolator reaches the preset value P.

[0010] Beneficial effects The present application provides an intelligent control structure and method for pressure difference and air volume of a negative pressure isolator. Through an air inlet pressure measuring device, the changes in air volume can be fed back in real time. When the cleanliness requirement is low and the air volume demand is small, the pressure and air volume of the cavity can be guaranteed by lowering the opening of the regulating valve and reducing the fan frequency. When the cleanliness requirement is high, the pressure and air volume of the cavity can be guaranteed by increasing the opening of the regulating valve or increasing the fan frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are intended to facilitate understanding of the technical solutions of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solutions of the present disclosure and do not constitute a limitation of the technical solutions of the present disclosure. The shapes and sizes of the components in the accompanying drawings do not reflect the actual scale and are intended only to illustrate the contents of this application.

[0012] Figure 1 A schematic diagram of a control structure provided in one embodiment of the present application.

[0013] Figure 2 This is a flow chart of a control method provided in another embodiment of the present application.

[0014] In the above figures, 1. Filter; 2. Ventilation duct; 3. Air inlet pressure test device; 31. Pagoda connector; 32. Pressure stabilizing ring; 4. Air volume regulating valve. DETAILED DESCRIPTION

[0015] The above scheme is further described below with reference to specific examples. It should be understood that these examples are intended to illustrate the present application and are not intended to limit the scope of the present application. The implementation conditions used in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those used in routine experiments.

[0016] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. In this article, "electrical connection" includes the situation where constituent elements are connected together through an element with some electrical function. "Element with some electrical function" is not particularly limited as long as it can transfer electrical signals between connected constituent elements. "Element with some electrical function" can be, for example, an electrode or wiring, or a switching element such as a transistor, or other functional elements such as a resistor, inductor or capacitor. “Up,” “down,” “left,” “right,” etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0017] In this application, terms such as "upper," "lower," "inner," and "middle" indicate positions or locations based on those shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to specific positions, or to their construction or operation in a specific position.

[0018] Example 1 This embodiment provides a negative pressure isolator pressure difference and air volume intelligent control structure, such as Figure 1As shown, it includes a filter 1, the air inlet of the filter 1 is connected to the ventilation duct 2, and the pipe mouth of the ventilation duct 2 away from the air inlet of the filter 1 is provided with an air inlet pressure testing device 3, the air inlet pressure testing device 3 is used to measure the wind pressure in the ventilation duct 2, and the air inlet pressure testing device 3 includes a pagoda joint 31, a pressure transmitter and a pressure stabilizing ring 32, one end of the pagoda joint 31 is connected to the pressure transmitter, and the other end of the pagoda joint 31 is connected to the pressure stabilizing ring 32, the pressure stabilizing ring 32 is arranged in the ventilation duct 2, the pressure stabilizing ring 32 is a circular ring structure, and the pressure stabilizing ring 32 is attached to the ventilation duct around the inner wall of the ventilation duct 2. 2 On the inner wall surface, an air volume regulating valve 4 is provided at the ventilation duct 2, which is used to adjust the air intake in the channel duct. The negative pressure isolator is installed in the exhaust duct through the fan. The cavity is formed with negative pressure by exhausting air. The negative pressure formed by the cavity allows the outside air to enter the cavity through the ventilation duct. The air intake pressure measuring device can provide real-time feedback on the change of air volume. When the cleanliness requirement is low and the air volume demand is small, the cavity pressure and air volume can be guaranteed by lowering the opening of the regulating valve and reducing the fan frequency. When the cleanliness requirement is high, the cavity pressure and air volume can be guaranteed by increasing the opening of the regulating valve or increasing the fan frequency.

[0019] Example 2 This embodiment provides a method for intelligently controlling the pressure difference and air volume of a negative pressure isolator. Figure 2 As shown, the following steps are included: S1, preset the internal pressure value T of the negative pressure isolator cavity, preset the cleanliness requirement P of the negative pressure isolator working, Control the air volume regulating valve to open to 50%, start the fan, test the air inlet pressure in the ventilation duct with the air inlet pressure test device, and adjust the opening of the fan and the air volume regulating valve to make the pressure inside the cavity reach the set value T; S2. Test the working cleanliness of the negative pressure isolator, compare the real-time working cleanliness of the negative pressure isolator with the preset value P, and adjust the valve opening of the air volume control valve and the frequency of the fan according to the comparison results. When the real-time working cleanliness of the negative pressure isolator is lower than the preset value P, increase the valve opening of the air volume control valve and increase the fan frequency to keep the air inlet pressure in the ventilation duct unchanged and increase the air inlet volume until the real-time working cleanliness of the negative pressure isolator reaches the preset value P. When the real-time working cleanliness of the negative pressure isolator is higher than the preset value P, reduce the valve opening of the air volume control valve and lower the fan frequency to keep the air inlet pressure in the ventilation duct unchanged and reduce the air inlet volume until the real-time working cleanliness of the negative pressure isolator reaches the preset value P.

[0020] S3. Through the above operations, the cavity pressure and cavity cleanliness meet the requirements. At this time, the pressure value measured by the pressure test device in the ventilation duct and the pressure value in the cavity are written into the automatic program.

[0021] When the equipment runs the automatic program again and the parameters remain unchanged, the valve opening is adjusted based on the opening at the end of the last time as the starting state, shortening the preparation time for each startup. The purpose of the automatic program is that during the use of the equipment, the air intake and exhaust efficiency will increase with the use time. In order to ensure that the equipment can always maintain a stable working state during long-term use, without the need for regular manual adjustment, an intelligent control system is set up.

[0022] The above embodiments are intended only to illustrate the technical concepts and features of this application. Their purpose is to enable those familiar with the art to understand the content of this application and implement it accordingly. They are not intended to limit the scope of protection of this application. Any equivalent changes or modifications made in accordance with the spirit of this application shall be included in the scope of protection of this application.

Claims

1. A negative pressure isolator pressure difference and air volume intelligent control structure, characterized by: It includes a filter, the air inlet of the filter is connected to the ventilation duct, and the pipe mouth of the ventilation duct away from the air inlet of the filter is provided with an air inlet pressure testing device, the air inlet pressure testing device is used to measure the wind pressure in the ventilation duct, and the ventilation duct is provided with an air volume regulating valve, the air volume regulating valve is used to adjust the air intake volume in the channel pipe, the negative pressure isolator is installed in the exhaust duct through a fan, and a negative pressure is formed in the cavity through exhaust, and the negative pressure formed in the cavity allows outside air to enter the cavity through the ventilation duct.

2. The negative pressure isolator pressure difference and air volume intelligent control structure according to claim 1, characterized in that: The air inlet pressure testing device includes a pagoda connector, a pressure transmitter and a pressure stabilizing ring. One end of the pagoda connector is connected to the pressure transmitter, and the other end of the pagoda connector is connected to the pressure stabilizing ring. The pressure stabilizing ring is arranged in the ventilation duct.

3. The intelligent control structure for pressure difference and air volume of a negative pressure isolator according to claim 1, characterized in that: The pressure stabilizing ring is a circular ring structure, and the pressure stabilizing ring surrounds the inner wall surface of the ventilation duct and is attached to the inner wall surface of the ventilation duct.

4. A method for intelligently controlling pressure difference and air volume of a negative pressure isolator, characterized by: The steps include: The internal pressure value T of the negative pressure isolator cavity is preset, and the cleanliness requirement P of the negative pressure isolator is preset. Control the air volume regulating valve to open to 50%, turn on the fan, test the air inlet pressure in the ventilation duct through the air inlet pressure test device, and adjust the opening of the fan and air volume regulating valve to make the pressure inside the cavity reach the set value T. Test the working cleanliness of the negative pressure isolator, compare the real-time working cleanliness of the negative pressure isolator with the preset value P, and adjust the valve opening of the air volume control valve and the frequency of the fan according to the comparison result to make the real-time working cleanliness of the negative pressure isolator reach the preset value P, and in this process always keep the pressure inside the negative pressure isolator cavity at T. Through the above operations, the cavity pressure and cavity cleanliness both reach the requirements. At this time, the pressure value measured by the pressure testing device in the ventilation duct and the pressure value in the cavity are written into the automatic program.

5. The method for intelligently controlling pressure difference and air volume of a negative pressure isolator according to claim 1, wherein: Adjusting the valve opening of the air volume regulating valve and the frequency of the fan according to the comparison results includes increasing the valve opening of the air volume regulating valve and increasing the frequency of the fan when the real-time cleanliness of the negative pressure isolator is lower than the preset value P, maintaining the internal pressure of the negative pressure isolator cavity unchanged, and increasing the air intake until the real-time cleanliness of the negative pressure isolator reaches the preset value P.

6. The method for intelligently controlling pressure difference and air volume of a negative pressure isolator according to claim 1, wherein: According to the comparison results, the valve opening of the air volume regulating valve and the frequency of the fan are adjusted, including when the real-time working cleanliness of the negative pressure isolator is higher than the preset value P, reducing the valve opening of the air volume regulating valve and lowering the fan frequency to keep the internal cavity pressure of the negative pressure isolator unchanged and reduce the air intake until the real-time working cleanliness of the negative pressure isolator reaches the preset value P.

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