Constant pressure difference control device for negative pressure ward

Abstract

The utility model relates to the technical field of negative pressure wards, and discloses a constant pressure difference control device for a negative pressure ward. The technical problems that in the prior art, the pressure difference of the negative pressure ward is difficult to dynamically adjust, and toxic gas is prone to overflowing in the filter element replacement process are solved. An air inlet and an air outlet are formed in the negative pressure ward, an air inlet module and an air exhaust module are installed, the air inlet module comprises an air inlet fan and an air inlet volume adjusting valve, and the air exhaust module comprises an air exhaust fan and an air exhaust volume adjusting valve; the air inlet and the air outlet are connected with a filter, the filter comprises a shell, two ends of the shell are communicated, a plurality of inlets and a plurality of outlets are formed, inlet baffles are mounted at the inlets, outlet baffles are mounted at the outlets, and a filter element is mounted in the shell. The system has the advantages of being high in precision, intelligent, energy-saving, efficient, safe, reliable and the like, reliable guarantee is provided for operation of a negative pressure ward, isolation protection capacity of a hospital is improved, and the system has wide application prospects.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of negative pressure ward, especially to a control device of constant pressure difference of negative pressure ward. BACKGROUND

[0002] The negative pressure ward is a necessary facility for isolating air-borne disease patients, which is used for controlling the air pressure in the ward through a specially designed and purified air treatment system, so that the air pressure in the ward is lower than that in other areas outside the ward, a negative pressure is formed in the ward, and the air contaminated by the patient cannot be leaked out, thereby protecting the medical staff and other patients. In order to effectively isolate and control the spread of pollutants, the negative pressure ward needs to maintain a certain pressure difference gradient, for example, the negative pressure degree of the bathroom, the ward room, the buffer room and the potentially contaminated corridor decreases in turn, and the pressure difference between adjacent and communicating rooms of different pollution levels is not less than 5Pa; the air pressure in the clean area should be kept positive relative to the outdoor atmospheric pressure.

[0003] The Chinese patent document 202022394807.1 in the prior art discloses a negative pressure ward. The negative pressure ward comprises a negative pressure ward body and a lighting lamp arranged in the ward. A radiation cold and heat source main machine, an exhaust main machine and a fresh air main machine are arranged on the roof of the negative pressure ward body. A bathroom is arranged on the side of the negative pressure ward body away from the entrance and exit door. Exhaust outlets are arranged on the side close to the bathroom and the side of the entrance and exit door, and the two exhaust outlets are connected to the exhaust main machine. Two air inlets are arranged between the two exhaust outlets and are connected to the fresh air main machine. The top of the negative pressure ward body is covered by a plurality of cold and heat radiation modules except the areas of the lighting lamp, the air inlet and the exhaust outlet. The cold and heat radiation modules are fixed to the top of the ward by a hoisting structure. The plurality of cold and heat radiation modules are connected to the radiation cold and heat source main machine through a distribution water tank.

[0004] However, the above-mentioned scheme has at least the following technical problems in the implementation process: it is difficult to dynamically adjust the pressure difference of the negative pressure ward, and further, toxic gas is easy to overflow during the replacement of the filter element. Therefore, it is urgent to propose a control device for constant pressure difference of negative pressure ward. SUMMARY

[0005] In view of the above technical problems, the present disclosure provides a control device for constant pressure difference of negative pressure ward, which solves the technical problems that it is difficult to dynamically adjust the pressure difference of the negative pressure ward in the prior art, and further, toxic gas is easy to overflow during the replacement of the filter element.

[0006] According to one aspect of the present disclosure, a control device for maintaining constant pressure difference in a negative pressure ward is provided, wherein an air inlet and an air outlet are arranged in the negative pressure ward, and an air inlet module and an air outlet module are respectively installed, the air inlet module comprises an air inlet fan and an air inlet flow regulating valve, and the air outlet module comprises an air outlet fan and an air outlet flow regulating valve; the air inlet and the air outlet are both connected with a filter, the filter comprises a shell, a plurality of inlets and a plurality of outlets are respectively arranged at both ends of the shell, an inlet baffle is arranged at each inlet, an outlet baffle is arranged at each outlet, a filter element is arranged between the corresponding inlet and outlet in the shell, the inlet baffle is provided with a driving structure to realize opening and closing of the inlet baffle, and the outlet baffle is arranged in the shell through a spring to realize opening of the outlet baffle under air extrusion.

[0007] In some embodiments of the present disclosure, the driving structure comprises a motor, a power shaft of the motor is connected with a lead screw, a nut is threadedly connected with the lead screw, and the nut is connected with the inlet baffle.

[0008] In some embodiments of the present disclosure, the air inlet fan and the air outlet fan are both variable frequency fans.

[0009] In some embodiments of the present disclosure, a pressure difference sensor for collecting the pressure difference between the negative pressure ward and the external environment is further included, the pressure difference sensor is connected with an industrial computer through a serial port, the industrial computer is connected with the air inlet fan through the air inlet flow regulating valve and connected with the air outlet fan through the air outlet flow regulating valve, so as to control the air inlet flow and the air outlet flow.

[0010] In some embodiments of the present disclosure, a pressure sensor is further included, the pressure sensor is connected with the industrial computer, and the industrial computer is connected with a vacuum pump through a high-speed on-off valve.

[0011] In some embodiments of the present disclosure, a flow sensor is arranged at the air inlet to detect the gas flow of the external air source flowing into the negative pressure ward.

[0012] In some embodiments of the present disclosure, a biological safety valve is arranged at the air inlet and the air outlet to realize zero leakage and protect the safety of personnel.

[0013] The present utility model has the advantages of:

[0014] The differential pressure between the negative pressure ward and the external environment is monitored in real time by the differential pressure sensor, and the data is transmitted to the industrial computer. The industrial computer automatically adjusts the opening of the air inlet and air outlet adjusting valves according to the preset differential pressure value, thereby accurately controlling the air inlet and air outlet, ensuring the stability of the differential pressure in the negative pressure ward, effectively preventing the leakage of contaminated air in the ward, and ensuring the safety of medical staff and the external environment. The variable frequency fan is used as the air inlet and air outlet fan, which can automatically adjust the speed of the fan according to the actual demand, realizing energy-saving operation. While meeting the differential pressure requirement, the energy consumption is reduced, and the operation efficiency of the system is improved. The entire control system is controlled by the industrial computer, which can realize automatic operation without manual intervention. The industrial computer adjusts the action of each actuator in real time according to the data feedback by the sensor, ensures the stable operation of the system, and reduces the error and risk of manual operation. The air inlet and air outlet are both equipped with filters and biological safety valves. The filter housing is through at both ends, with multiple inlets and outlets. The inlet is equipped with an inlet baffle that can be driven to open and close by a motor, and the outlet is equipped with an outlet baffle that can be squeezed open by air through a spring. This design can effectively improve the filtering efficiency and ensure the cleanliness of the air entering the ward. The biological safety valve can achieve zero leakage protection, further ensuring personnel safety and preventing the leakage of harmful biological aerosols. Pressure and flow sensors are also provided to monitor the pressure and flow state of the system in real time and transmit the data to the industrial computer. The industrial computer can diagnose faults according to these data, discover abnormal conditions of the system in time, and issue warning signals for timely maintenance and processing, improving the reliability and stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Structure diagram of the control device for constant differential pressure of the negative pressure ward;

[0016] Figure 2 Structure diagram of the filter;

[0017] Figure 3 Another view structure diagram of the filter;

[0018] Figure 4 Top view of the filter;

[0019] Figure 5 A-A sectional view of the filter; Figure 4

[0020] Names of components in the figure: 1, filter; 2, housing; 3, inlet; 4, outlet; 5, inlet baffle; 6, outlet baffle; 7, filter element; 8, spring; 9, motor; 10, lead screw; 11, nut. DETAILED DESCRIPTION

[0021] ​The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. Embodiment 1

[0022] The example discloses a control device for constant pressure difference of negative pressure ward, referring to Figures 1 to 5 , the negative pressure ward is provided with an air inlet and an air outlet, and an air inlet module and an air outlet module are respectively installed, the air inlet module comprises an air inlet fan and an air inlet amount adjusting valve, and the air outlet module comprises an air outlet fan and an air outlet amount adjusting valve; the air inlet and the air outlet are both connected with a filter 1, the filter 1 comprises an outer shell 2, a plurality of inlets 3 and a plurality of outlets 4 are respectively arranged at both ends of the outer shell 2, an inlet baffle 5 is installed at each inlet 3, an outlet baffle 6 is installed at each outlet 4, a filter core 7 is arranged between the corresponding inlet 3 and outlet 4 in the outer shell 2, the inlet baffle 5 is provided with a driving structure to realize opening and closing of the inlet baffle 5, and the outlet baffle 6 is installed in the outer shell 2 through a spring 8 to realize opening of the outlet baffle 6 under air extrusion.

[0023] The driving structure comprises a motor 9, a power shaft of the motor 9 is connected with a lead screw 10, a nut 11 is threadedly and cooperatively installed on the lead screw 10, and the nut 11 is connected with the inlet baffle 5.

[0024] The air inlet fan and the air outlet fan are both variable frequency fans.

[0025] The pressure difference sensor for collecting the pressure difference between the negative pressure ward and the external environment is further included, the pressure difference sensor is connected with an industrial computer through serial port communication, the industrial computer is connected with the air inlet fan through the air inlet amount adjusting valve and connected with the air outlet fan through the air outlet amount adjusting valve to control the air inlet amount and the air outlet amount.

[0026] The pressure sensor is further included, the pressure sensor is connected with the industrial computer, and the industrial computer is connected with a vacuum pump through a high-speed on-off valve.

[0027] The flow sensor is installed at the air inlet to detect the gas flow of the external gas source flowing into the negative pressure ward.

[0028] The biological safety valve is installed at the air inlet and the air outlet to realize zero leakage protection of personnel safety.

[0029] During the working process, the differential pressure sensor collects the differential pressure value between the negative pressure ward and the external environment in real time, and transmits the data to the industrial computer through serial communication. The industrial computer controls the operation of the air inlet fan and the air outlet fan through the air inlet amount adjusting valve and the air outlet amount adjusting valve according to the preset differential pressure value, so as to adjust the air inlet amount and the air outlet amount, thereby maintaining the differential pressure in the negative pressure ward constant. The air inlet fan and the air outlet fan are both variable frequency fans, which can automatically adjust the rotating speed according to the instruction of the industrial computer, so as to realize the accurate control of the air inlet amount and the air outlet amount. The air inlet amount adjusting valve in the air inlet module and the air outlet amount adjusting valve in the air outlet module also adjust the opening degree according to the instruction of the industrial computer, so as to further accurately control the air volume. The air inlet and the air outlet are both connected with the filter 1. The shell 2 of the filter 1 is through at both ends and is provided with a plurality of inlets 3 and a plurality of outlets 4. An inlet baffle 5 is installed at each inlet 3, and the inlet baffle 5 is controlled to open and close by a driving structure. The driving structure includes a motor 9, the power shaft of the motor is connected with a lead screw 10, the lead screw 10 is threadedly connected with a nut 11, and the nut 11 is connected with the inlet baffle 5. The opening and closing of the inlet baffle 5 can be realized by the operation of the motor 9. An outlet baffle 6 is installed at each outlet 4, and the outlet baffle 6 is installed on the shell 2 by a spring 8, and can be opened by air extrusion when air passes through the filter. A filter element 7 is arranged between the corresponding inlet 3 and outlet 4 in the shell 2, and air is filtered. The pressure sensor monitors the pressure state of the system in real time and transmits the data to the industrial computer. The industrial computer controls the operation of the vacuum pump through the high-speed on-off valve according to the data of the pressure sensor, so as to maintain the pressure of the system stable. The air inlet is provided with a flow sensor, which detects the air flow of the external air source flowing into the negative pressure ward in real time and transmits the data to the industrial computer. The industrial computer further adjusts the operation of the air inlet fan and the air outlet fan according to the flow data to ensure that the air volume meets the demand. The air inlet and the air outlet are both provided with a biological safety valve to realize zero leakage protection and ensure that harmful biological aerosols will not leak to protect the safety of personnel.

[0030] Although some preferred embodiments of the present application have been described, those skilled in the art who know the basic inventive concept can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0031] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. A control device for maintaining a constant pressure differential in a negative pressure room, characterized by: The negative pressure ward is provided with an air inlet and an air outlet, and an air inlet module and an air outlet module are respectively installed, the air inlet module comprises an air inlet fan and an air inlet flow regulating valve, the air outlet module comprises an air outlet fan and an air outlet flow regulating valve; the air inlet and the air outlet are both connected with a filter, the filter comprises a shell, a plurality of inlets and a plurality of outlets are respectively arranged at both ends of the shell, an inlet baffle is installed at each inlet, an outlet baffle is installed at each outlet, a filter core is arranged between the corresponding inlet and outlet in the shell, the inlet baffle is provided with a driving structure to realize opening and closing of the inlet baffle, and the outlet baffle is installed in the shell through a spring to realize opening of the outlet baffle under extrusion of air.

2. The control device for maintaining a constant pressure difference in a negative pressure room according to claim 1, wherein: The driving structure comprises a motor, a power shaft of the motor is connected with a lead screw, a nut is threadedly and movably installed on the lead screw, and the nut is connected with the inlet baffle.

3. The control device for maintaining a constant pressure difference in a negative pressure room according to claim 1, wherein: The air inlet fan and the air outlet fan are both variable frequency fans.

4. The control device for maintaining a constant pressure difference in a negative pressure room according to claim 3, wherein: A differential pressure sensor for collecting a differential pressure value between the negative pressure ward and an external environment is further included, the differential pressure sensor is connected with the industrial computer through serial communication, the industrial computer is connected with the air inlet fan through the air inlet flow regulating valve and connected with the air outlet fan through the air outlet flow regulating valve, so as to control air inlet flow and air outlet flow.

5. The control device for maintaining a constant pressure difference in a negative pressure room according to claim 4, wherein: A pressure sensor is further included, the pressure sensor is connected with the industrial computer, and the industrial computer is connected with the vacuum pump through a high-speed on-off valve.

6. The control device for maintaining a constant pressure difference in a negative pressure room according to claim 1, wherein: The air inlet is provided with a flow sensor to detect gas flow of an external gas source flowing into the negative pressure ward.

7. The control device for maintaining a constant pressure difference in a negative pressure room according to claim 1, wherein: The air inlet and the air outlet are both provided with a biological safety valve to realize zero leakage and protect personnel safety.

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