EFU capable of realizing automatic alarm function

Abstract

The utility model discloses an EFU capable of realizing an automatic alarm function, which comprises a fan filter box body, a single-phase alternating current power supply, a switching power supply unit and a direct current fan unit are arranged in the fan filter box body, and a power supply control unit and a power supply indicating lamp are connected between the single-phase alternating current power supply and the switching power supply unit. A differential pressure sensor unit, a resistance alarm buzzer unit, a resistance differential pressure switch unit, a fault alarm buzzer unit, a fault differential pressure switch unit and a PWM (Pulse Width Modulation) speed regulator unit are connected between the switching power supply unit and the direct current fan unit; an RS pressure difference transmitter and a filter resistance detection pressure difference switch are positioned and mounted at the top of the fan filtering box body. According to the EFU capable of achieving the automatic alarm function, for an EFU draught fan without the networking function and the alarm function, the filter screen service life alarm function and the draught fan fault alarm function are achieved through the external differential pressure gauge and the differential pressure switch.

Description

Technical Field

[0001] The utility model relates to the field of EFU, in particular to an EFU capable of realizing an automatic alarm function. Background Art

[0002] EFU is a fan filter unit, a laminar flow filter air supply unit that can be installed and used individually or modularly. With FFU as the core, clean workbenches, clean sheds, and clean production lines can be made. With the continuous development of science and technology, people's requirements for the manufacturing process of EFU are getting higher and higher.

[0003] The existing EFU has certain drawbacks when in use. Currently, the EFU on the market is generally not equipped with a controller with remote communication function when used on equipment. The speed is mostly set by local control. In special circumstances, the on-site personnel are unaware that the EFU in use may stop running for some reason, or there is no prompt after the filter reaches the end of its life and is not replaced in time, resulting in the EFU on the equipment becoming ineffective. For this reason, we propose an EFU that can realize automatic alarm function. Utility Model Content

[0004] Technical problem solved: In view of the shortcomings of the prior art, the utility model provides an EFU that can realize automatic alarm function. For EFU fans that do not have networking function and alarm function, the filter life alarm and fan failure alarm functions are realized through an external differential pressure gauge and a differential pressure switch, which can effectively solve the problems in the background technology.

[0005] Technical solution: To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: an EFU that can realize automatic alarm function, including a fan filter box, wherein a single-phase AC power supply, a switching power supply unit and a DC fan unit are arranged inside the fan filter box, a power control unit and a power indicator light are connected between the single-phase AC power supply and the switching power supply unit, and a pressure difference sensor unit, a resistance alarm buzzer unit, a resistance pressure difference switch unit, a fault alarm buzzer unit, a fault pressure difference switch unit and a PWM speed regulator unit are connected between the switching power supply unit and the DC fan unit.

[0006] Preferably, a RS differential pressure transmitter, a filter resistance detection differential pressure switch, a filter final resistance alarm buzzer, a fan failure and non-operation alarm buzzer and a fan failure detection differential pressure switch are installed on the top of the fan filter box, a PWM fan speed regulator and a power switch are installed on the front end of the fan filter box, and a filter is installed on the bottom of the fan filter box.

[0007] Preferably, the resistance alarm buzzer unit is connected to the position of the resistance pressure difference switch unit, the fault alarm buzzer unit is connected to the position of the fault pressure difference switch unit, and the resistance pressure difference switch unit and the fault pressure difference switch unit control the resistance alarm buzzer unit and the fault alarm buzzer unit respectively.

[0008] Preferably, the DC fan unit is connected to a switching power supply unit, and the switch of the switching power supply unit is turned on, at which time the switching power supply of the switching power supply unit is powered and outputs DC24V.

[0009] Preferably, the DC fan unit starts running when it is powered by DC24V, and at the same time, the PWM speed regulator unit is powered to control the speed of the DC fan unit.

[0010] Preferably, the differential pressure sensor unit is powered by DC24V, measures the differential pressure inside and outside the fan filter box respectively through an internal differential pressure tube, and performs remote differential pressure display through RS485 communication.

[0011] Beneficial effects: Compared with the prior art, the utility model provides an EFU capable of realizing an automatic alarm function, which has the following beneficial effects: the EFU capable of realizing an automatic alarm function realizes the filter life alarm and fan failure alarm functions through an external differential pressure gauge and a differential pressure switch for an EFU fan that does not have a networking function and an alarm function; the EFU is connected to the power line, and the fan is powered on and operated by pressing the power switch, and the fan operating speed is controlled by the PWM speed regulator to obtain the required air volume, and at the same time, the differential pressure transmitter is powered on to display the current fan static pressure, and the fan static pressure can be remotely monitored through RS485;

[0012] Filter final resistance alarm

[0013] The final resistance alarm value of the filter is set by presetting the filter resistance detection pressure differential switch. When the filter runs to the set final resistance, the NO / COM dry contact of the pressure differential switch connected to the filter total resistance alarm buzzer is closed, and the buzzer emits an audible and visual alarm to indicate that the filter has reached the final resistance.

[0014] Fan failure alarm

[0015] By setting the NC / COM dry contact of the fan fault detection differential pressure switch to connect with the fan fault non-operation alarm buzzer and setting a differential pressure at the lowest point of normal operation. When the fan is powered on and operating normally, the static pressure is higher than the set static pressure, the NC / COM dry contact of the differential pressure switch is in the disconnected state, and the buzzer does not alarm. When the EFU is powered on and the fan is not running, it can be judged as a fan fault state. At this time, the static pressure of the fan will be lower than the set value, the NC / COM of the differential pressure switch will be reset and closed, and the buzzer will emit an audible and visual alarm to indicate a fan fault. The entire EFU has a simple structure, is easy to operate, and has a better effect than the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the overall structure of an EFU capable of realizing an automatic alarm function.

[0017] Figure 2 This is a structural schematic diagram of the main view of an EFU capable of realizing an automatic alarm function according to the utility model.

[0018] Figure 3 This is a structural schematic diagram of a side view of an EFU capable of realizing an automatic alarm function according to the utility model.

[0019] Figure 4 The utility model is a schematic diagram of the internal circuit principle of an EFU capable of realizing an automatic alarm function.

[0020] In the figure: 1. Fan filter box; 2. Filter resistance detection pressure difference switch; 3. Pressure difference transmitter with RS485; 4. Filter final resistance alarm buzzer; 5. Fan failure alarm buzzer; 6. Fan failure detection pressure difference switch; 7. PWM fan speed regulator; 8. Power switch; 9. Filter; 10. Single-phase AC power supply; 11. Power control unit; 12. Power indicator light; 13. Switching power supply unit; 14. Pressure difference sensor unit; 15. Resistance alarm buzzer unit; 16. Resistance pressure difference switch unit; 17. Fault alarm buzzer unit; 18. Fault pressure difference switch unit; 19. PWM speed regulator unit; 20. DC fan unit. DETAILED DESCRIPTION

[0021] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] like Figure 1-4 As shown, an EFU capable of realizing automatic alarm function comprises a fan filter box 1, wherein a single-phase AC power supply 10, a switching power supply unit 13 and a DC fan unit 20 are arranged inside the fan filter box 1, a power control unit 11 and a power indicator light 12 are connected between the single-phase AC power supply 10 and the switching power supply unit 13, a differential pressure sensor unit 14, a resistance alarm buzzer unit 15, a resistance differential pressure switch unit 16, a fault alarm buzzer unit 17, a fault differential pressure switch unit 18 and a PWM speed regulator unit 19 are connected between the switching power supply unit 13 and the DC fan unit 20, and for the EFU fan which does not have networking function and alarm function, the filter life alarm and fan fault alarm function are realized through an external differential pressure gauge and a differential pressure switch.

[0025] Furthermore, a RS485 differential pressure transmitter 3, a filter resistance detection differential pressure switch 2, a filter final resistance alarm buzzer 4, a fan failure and non-operation alarm buzzer 5 and a fan failure detection differential pressure switch 6 are installed on the top of the fan filter box 1, a PWM fan speed regulator 7 and a power switch 8 are installed on the front end of the fan filter box 1, and a filter 9 is installed on the bottom of the fan filter box 1.

[0026] Furthermore, the resistance alarm buzzer unit 15 is connected to the position of the resistance pressure difference switch unit 16, the fault alarm buzzer unit 17 is connected to the position of the fault pressure difference switch unit 18, and the resistance pressure difference switch unit 16 and the fault pressure difference switch unit 18 control the resistance alarm buzzer unit 15 and the fault alarm buzzer unit 17 respectively.

[0027] Further, the DC fan unit 20 is connected to the switching power supply unit 13, and the switch of the switching power supply unit 13 is turned on. At this time, the switching power supply of the switching power supply unit 13 is powered and outputs DC24V.

[0028] Furthermore, the DC fan unit 20 is powered by DC24V and starts to run, and at the same time, the PWM speed regulator unit 19 is powered to control the speed of the DC fan unit 20.

[0029] Furthermore, the differential pressure sensor unit 14 is powered by DC24V, and measures the differential pressure inside and outside the fan filter box 1 through the internal differential pressure tube, and performs remote differential pressure display through RS485 communication.

[0030] Working principle: The utility model includes a fan filter box 1, a filter resistance detection pressure differential switch 2, a pressure differential transmitter with RS485 3, a filter final resistance alarm buzzer 4, a fan failure non-operation alarm buzzer 5, a fan failure detection pressure differential switch 6, a PWM fan speed regulator 7, a power switch 8, a filter 9, a single-phase AC power supply 10, a power control unit 11, a power indicator light 12, a switching power supply unit 13, a pressure differential sensor unit 14, a resistance alarm buzzer unit 15, a resistance pressure differential switch unit 16, a fault alarm buzzer unit 17, a fault pressure differential switch unit 18, a PWM speed regulator unit 19, and a DC fan unit 20;

[0031] Functional implementation description:

[0032] 1. Connect the AC220V power supply and turn on the power switch. At this time, the AV220V-DC24V switching power supply is energized and outputs DC24V.

[0033] 2. The fan starts running when it is powered by DC24V, and the PWM speed regulator is powered to control the speed of the fan.

[0034] 3. The differential pressure sensor is powered by DC24V, and measures the differential pressure inside and outside the EFU box, that is, the current filter resistance value, through the differential pressure tube, and displays it. At the same time, remote differential pressure display can be achieved through RS485 communication.

[0035] Implementation of alarm function:

[0036] 1. Filter final resistance alarm: Set the final resistance value of the current filter under the air volume on the filter resistance detection differential pressure switch, and measure the pressure difference between the inside and outside of the EFU box, i.e. the resistance value of the current filter, through the differential pressure tube. Connect the normally open contact of the filter resistance detection differential pressure switch in series with the filter final resistance alarm buzzer, and connect them in parallel at both ends of the DC24V power supply. After a period of use, the filter will capture more and more particles, and the resistance will increase accordingly. When the resistance reaches the final resistance of the filter set by the filter resistance detection differential pressure switch, the normally open contact will close, and the final resistance alarm buzzer will be energized to alarm, prompting that a new filter should be replaced.

[0037] 2. Fan failure and non-operation alarm: set the lowest value of the filter resistance under the current air volume when the fan is operating normally on the fan failure detection differential pressure switch, and measure the pressure difference between the inside and outside of the EFU box, that is, the resistance value of the current filter, through the differential pressure tube. And connect the normally closed contact of the fan failure detection differential pressure switch in series with the fan failure and non-operation alarm buzzer, and connect them in parallel at both ends of the DC24V power supply. Since the pressure value inside the EFU box must be greater than the lowest value of the filter resistance under the current air volume during normal operation, the normally closed contact of the fan failure detection differential pressure switch is disconnected at this time. When the fan stops running due to a fault, the pressure value inside the box will be lower than the set value of the fan failure detection differential pressure switch originally set, and the normally closed contact is reset. Since the fan stops due to a fault and the DC24V power supply is still there, the fan failure and non-operation alarm buzzer is energized to alarm, indicating that the fan is faulty.

[0038] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0039] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. An EFU capable of realizing an automatic alarm function, comprising a fan filter housing (1), characterized in that: The fan filter housing (1) is provided with a single-phase AC power supply (10), a switching power supply unit (13) and a DC fan unit (20) inside; a power control unit (11) and a power indicator light (12) are connected between the single-phase AC power supply (10) and the switching power supply unit (13); a differential pressure sensor unit (14), a resistance alarm buzzer unit (15), a resistance differential pressure switch unit (16), a fault alarm buzzer unit (17), a fault differential pressure switch unit (18) and a PWM speed regulator unit (19) are connected between the switching power supply unit (13) and the DC fan unit (20).

2. The EFU capable of realizing automatic alarm function according to claim 1, characterized in that: The top of the fan filter box (1) is positioned and installed with a differential pressure transmitter with RS485 (3), a filter resistance detection differential pressure switch (2), a filter final resistance alarm buzzer (4), a fan failure non-operation alarm buzzer (5) and a fan failure detection differential pressure switch (6); the front end of the fan filter box (1) is positioned and installed with a PWM fan speed regulator (7) and a power switch (8); and the bottom of the fan filter box (1) is positioned and installed with a filter (9).

3. The EFU capable of realizing automatic alarm function according to claim 1, characterized in that: The resistance alarm buzzer unit (15) is connected to the position of the resistance differential pressure switch unit (16), and the fault alarm buzzer unit (17) is connected to the position of the fault differential pressure switch unit (18), and the resistance differential pressure switch unit (16) and the fault differential pressure switch unit (18) respectively control the resistance alarm buzzer unit (15) and the fault alarm buzzer unit (17).

4. The EFU capable of realizing automatic alarm function according to claim 1, characterized in that: The DC fan unit (20) is connected to the switching power supply unit (13), and the switch of the switching power supply unit (13) is turned on. At this time, the switching power supply of the switching power supply unit (13) is powered and outputs DC24V.

5. The EFU capable of realizing automatic alarm function according to claim 1, characterized in that: The DC fan unit (20) is powered by DC24V and starts to operate, while the PWM speed regulator unit (19) is powered to control the speed of the DC fan unit (20).

6. The EFU capable of realizing automatic alarm function according to claim 1, characterized in that: The differential pressure sensor unit (14) is powered by DC24V, and measures the internal and external differential pressures of the fan filter box (1) respectively through an internal differential pressure tube, and performs remote differential pressure display through RS485 communication.

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