Ventilation air speed detection type fan air supply system

Abstract

The utility model discloses a ventilation air speed detection type fan air supply system which comprises an electric air valve pipe, a cabinet type fan, a flexible connecting pipe, a reducer union pipe, a first manual adjusting valve pipe, a short pipe, a belt air speed measuring pipe, a three-way pipe, a second manual adjusting valve pipe, an end socket pipe and a monitoring box. The electric air valve pipe is installed at the input end of the cabinet type draught fan, the output end of the cabinet type draught fan is communicated to the small end of the reducer union pipe through the soft connecting pipe, the large end of the reducer union pipe is communicated to one end of the short pipe through the first manual adjusting valve pipe, and the other end of the short pipe is communicated to the air inlet end of the wind speed measuring pipe. The belt wind speed measuring pipe comprises a uniform wind guide structure, a communicating pipe body, a pitot tube and an induction detector. The ventilation speed detection type fan air supply system solves the problem that in the prior art, under the condition that normal operation of a fan air supply system is not affected, the position where a segmented air pressure detection device is installed in the fan air supply system is unknown.

Description

Technical Field

[0001] The utility model relates to the field of ventilation pressure detection, and particularly relates to a fan air supply system with ventilation wind speed detection type. Background Art

[0002] The Chinese patent discloses a sectional air pressure detection device inside a pipeline with an application number of: CN201510560137.7. This sectional air pressure detection device inside the pipeline includes a bottom connecting rod, a pressure measuring plate, a displacement sensor, an analog-to-digital converter and a display. The bottom connecting rod is of a convex structure, and strip-shaped adjusting holes are transversely arranged on the left and right sides of the upper part of the convex structure. A plurality of pressure measuring plates are provided and are uniformly fixed along the transverse direction of the convex structure. The displacement sensor is arranged on the side of the pressure measuring plate, and the displacement sensor is sequentially connected to the analog-to-digital converter and the display.

[0003] Although the above sectional air pressure detection device inside the pipeline can realize the detection of the air pressure inside the pipeline, the disadvantages still existing in this sectional air pressure detection device inside the pipeline are: without affecting the normal operation of the fan air supply system, it is not known where to install this sectional air pressure detection device inside the fan air supply system. Content of the Utility Model

[0004] The utility model aims to provide a fan air supply system with ventilation wind speed detection type, so as to solve the problem in the prior art that without affecting the normal operation of the fan air supply system, it is not known where to install the sectional air pressure detection device in the fan air supply system.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] The utility model discloses a ventilation air speed detection type fan air supply system, which comprises: an electric air valve pipe, a cabinet fan, a flexible connection pipe, a reducing joint pipe, a first manual regulating valve pipe, a short pipe, a pipe with air speed measurement, a tee pipe, a second manual regulating valve pipe, a head pipe and a monitoring box; the electric air valve pipe is installed at the input end of the cabinet fan, the output end of the cabinet fan is communicated with the small end of the reducing joint pipe through the flexible connection pipe, the large end of the reducing joint pipe is communicated with one end of the short pipe through the first manual regulating valve pipe, the other end of the short pipe is communicated with the air inlet end of the pipe with air speed measurement, the air outlet end of the pipe with air speed measurement is communicated with the first end of the tee pipe, the second end of the tee pipe is communicated with the input end of the head pipe through the second manual regulating valve pipe, and an air outlet is arranged on the side surface of the head pipe; the pipe with air speed measurement comprises: a uniform air guiding structure, a communicating pipe body, a pitot tube and an induction detector, the uniform air guiding structure is installed inside the air inlet end of the communicating pipe body, the pitot tube extends into the air outlet end of the communicating pipe body, the pitot tube is installed on the communicating pipe body, the pitot tube is communicated with the input end of the induction detector, the induction detector is installed on the communicating pipe body, and the induction detector is electrically connected to the control box; the induction detector is electrically connected to the monitoring box, and the monitoring box is installed beside the induction detector.

[0007] Preferably, a pressure signal processing circuit and a control circuit are arranged inside the monitoring box, the input end of the pressure signal processing circuit is connected to the output end of the induction detector, and the output end of the induction detector is connected to the first input end and the second input end of the control circuit.

[0008] Preferably, there are two pipes with air speed measurement, and the pressure signal processing circuit comprises: a first differential amplification module, a second differential amplification module, a subtraction module and an AD conversion module. The first input end and the second input end of the first differential amplification module are respectively connected to the first output end and the second output end of an induction detector, the first input end and the second input end of the second differential amplification module are respectively connected to the first output end and the second output end of the other induction detector, the output end of the first differential amplification module is connected to the first input end of the AD conversion module, the output end of the first differential amplification module is communicated with the first input end of the subtraction module, the output end of the second differential amplification module is communicated with the second input end of the subtraction module, the output end of the subtraction module is connected to the second input end of the AD conversion module, and the first output end and the second output end of the AD conversion module are respectively connected to the first input end and the second input end of the control circuit.

[0009] Preferably, the induction detector is a pressure induction type, the induction detector is connected to the output end of the external power supply circuit through a controllable switch module, and the output end of the controllable switch module is connected to the output end of the control circuit.

[0010] Compared with the prior art, the utility model has the following beneficial effects:

[0011] In this application, the cabinet fan starts to work. When the cabinet fan is working, it sucks air from the electric air valve pipe. After the suction is completed, the electric air valve pipe supplies air to the reducing joint pipe through a flexible pipe. The reducing joint pipe guides the gas from the smaller-diameter output end of the cabinet fan into a short pipe with a larger diameter. There is a phenomenon of very uneven air pressure before the input end of the short pipe. Therefore, the air velocity measuring pipe with a wind speed measuring tube cannot be installed before the input end of the short pipe, but after the input end of the short pipe. The air pressure after the input end of the short pipe is relatively uniform. Therefore, the installation position of the air velocity measuring pipe with a wind speed measuring tube can accurately reflect the output air pressure of the pipeline. Subsequently, the gas will be guided to two directions for discharge after passing through the tee pipe, thereby realizing the detection of the air pressure when the air supply system outputs, ensuring that the air supply is transported to two directions at the same time, and also avoiding the influence of uneven air pressure on the air pressure detection when the air supply starts.

[0012] Other advantages, objectives, and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a fan air supply system for ventilation air velocity detection.

[0014] Figure 2 It is a schematic structural diagram at the position of the air velocity measuring pipe with a wind speed measuring tube.

[0015] Figure 3 It is a circuit diagram at an induction detector, a first differential amplification module, and an AD conversion module.

[0016] Figure 4 It is a circuit diagram at another induction detector, a second differential amplification module, and a subtraction module.

[0017] Reference numerals: electric air valve pipe 1, cabinet fan 2, flexible pipe 3, reducing joint pipe 4, first manual regulating valve pipe 5, short pipe 6, air velocity measuring pipe with a wind speed measuring tube 7, uniform air guiding structure 71, connecting pipe body 72, pitot tube 73, induction detector 74, tee pipe 8, second manual regulating valve pipe 9, head pipe 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical means, creative features, achieved objectives, and functions of the present utility model clearer and easier to understand, the present utility model will be further described below in conjunction with the drawings and specific embodiments:

[0019] As Figures 1 to 4As shown in the figure, the utility model discloses a ventilation air speed detection type fan air supply system, which includes: an electric air valve pipe 1, a cabinet fan 2, a flexible connecting pipe 3, a reducing joint pipe 4, a first manual regulating valve pipe 5, a short pipe 6, a wind speed measuring pipe 7, a tee pipe 8, a second manual regulating valve pipe 9, a head pipe 10 and a monitoring box; the electric air valve pipe 1 is installed at the input end of the cabinet fan 2, and the output end of the cabinet fan 2 is connected to the small end of the reducing joint pipe 4 through the flexible connecting pipe 3. The large end of the reducing joint pipe 4 is connected to one end of the short pipe 6 through the first manual regulating valve pipe 5. The other end of the short pipe 6 is connected to the air inlet end of the wind speed measuring pipe 7. The air outlet end of the wind speed measuring pipe 7 is connected to the first end of the tee pipe 8. The second end of the tee pipe 8 is connected to the input end of the head pipe 10 through the second manual regulating valve pipe 9. An air outlet is provided on the side of the head pipe 10; the wind speed measuring pipe 7 includes: a uniform air guiding structure 71, a connecting pipe body 72, a pitot tube 73 and an induction detector 74. The uniform air guiding structure 71 is installed inside the air inlet end of the connecting pipe body 72. The pitot tube 73 extends into the air outlet end of the connecting pipe body 72. The pitot tube 73 is installed on the connecting pipe body 72. The pitot tube 73 is connected to the input end of the induction detector 74. The induction detector 74 is installed on the connecting pipe body 72. The induction detector 74 is electrically connected to the control box; the induction detector 74 is electrically connected to the monitoring box, and the monitoring box is installed beside the induction detector 74.

[0020] A pressure signal processing circuit and a control circuit are arranged in the monitoring box. The input end of the pressure signal processing circuit is connected to the output end of the induction detector 74, and the output end of the induction detector 74 is connected to the first input end and the second input end of the control circuit. The pressure signal processing circuit realizes processing the pressure signal output by the induction detector 74 and sending it to the control circuit.

[0021] There are two wind speed measuring tubes. The pressure signal processing circuit includes: a first differential amplification module, a second differential amplification module, a subtraction module, and an AD conversion module. The first input terminal and the second input terminal of the first differential amplification module are respectively connected to the first output terminal and the second output terminal of an induction detector. The first input terminal and the second input terminal of the second differential amplification module are respectively connected to the first output terminal and the second output terminal of another induction detector. The output terminal of the first differential amplification module is connected to the first input terminal IN0 of the AD conversion module. The output terminal YOUT of the first differential amplification module is connected to the first input terminal of the subtraction module. The output terminal of the second differential amplification module is connected to the second input terminal of the subtraction module. The output terminal COUT1 of the subtraction module is connected to the second input terminal IN1 of the AD conversion module. The first output terminal and the second output terminal of the AD conversion module are respectively connected to the first input terminal and the second input terminal of the control circuit. The first differential amplification module and the second differential amplification module respectively process the output signals of the two induction detectors. Since the induction detector has two output terminals (i.e., the first output terminal and the second output terminal), the first differential amplification module and the second differential amplification module are used to convert the two outputs into one output. Subsequently, generally, the outputs of the first differential amplification module and the second differential amplification module are similar. In order to improve the detection accuracy and reduce the calculation steps, the difference detected by the two induction detectors is directly obtained by the subtraction module, and then the detected air pressure value is corrected with the difference, thereby improving the detection accuracy of the air pressure value.

[0022] The induction detector is a pressure induction type. The induction detector is connected to the output terminal of the external power supply circuit through a controllable switch module. The output terminal of the controllable switch module is connected to the output terminal of the control circuit. The operation of the induction detector is controlled. The controllable switch module uses a triode Q1. The collector of the triode Q1 is connected to the output terminal VCC of the external power supply circuit. The emitter of the triode Q1 is connected to the first power supply terminal of the induction detector. The second power supply terminal of the induction detector is grounded.

[0023] The first differential amplification module and the second differential amplification module both include: an amplification chip U1, an amplification chip U2, an amplification chip U3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R8, a resistor R9, and a capacitor C1. The non-inverting input terminal of the amplification chip U1 is the first input terminal of the first differential amplification module or the first input terminal of the second differential amplification module. The inverting input terminal of the amplification chip U1 is connected to the first terminal of the resistor R1 and the first terminal of the resistor R2. The second terminal of the resistor R2 is connected to the output terminal of the amplification chip U1 and the first terminal of the resistor R4. The second terminal of the resistor R4 is connected to the first terminal of the resistor R6 and the non-inverting input terminal of the amplification chip U3. The second terminal of the resistor R6 is connected to the output terminal VCC of the external power supply circuit. The non-inverting input terminal of the amplification chip U2 is the second input terminal of the first differential amplification module or the second input terminal of the second differential amplification module. The inverting input terminal of the amplification chip U1 is connected to the second terminal of the resistor R1 and the first terminal of the resistor R3. The second terminal of the resistor R3 is connected to the output terminal of the amplification chip U1 and the first terminal of the resistor R5. The second terminal of the resistor R5 is connected to the first terminal of the resistor R8 and the inverting input terminal of the amplification chip U3. The second terminal of the resistor R8 is connected to the output terminal of the amplification chip U3. The output terminal of the amplification chip U3 is connected to the first terminal of the resistor R9. The second terminal of the resistor R9 is connected to the positive electrode of the capacitor C1. The negative electrode of the capacitor C1 is grounded. The positive electrode of the capacitor C1 is the output terminal of the first differential amplification module or the output terminal of the second differential amplification module. After the two ends of the induction detector output, they are respectively amplified by the amplification chip U1 and the amplification chip U2, and then the amplified output of the amplification chip U1 and the amplification chip U2 is output to the amplification chip U3. The access of the output terminal VCC of the external power supply circuit at the non-inverting input terminal of the amplification chip U3 raises the voltage, making the difference between the non-inverting input terminal and the inverting input terminal of the amplification chip U3 relatively large, so as to realize the combination of the voltages at the two output terminals of the induction detector into one output, and ensure that there is a relatively large voltage value after output, which can be recognized by the subsequent stage.

[0024] The AD conversion module uses an AD conversion chip U4.

[0025] The subtraction module includes: an operational amplifier chip U5, a resistor R10, a resistor R11, a resistor R12, and a resistor R13. The first end of the resistor R10 is the first input end of the subtraction module. The second end of the resistor R10 is connected to the inverting input end of the operational amplifier chip U5. The first end of the resistor R11 is the second input end of the subtraction module. The second end of the resistor R11 is connected to the non-inverting input end of the operational amplifier chip U5 and one end of the resistor R12. The other end of the resistor R12 is grounded. The second end of the resistor R10 is connected to the first end of the resistor R13. The second end of the resistor R13 is connected to the output end of the operational amplifier chip U5. The output end of the operational amplifier chip U5 is the output end COUT1 of the subtraction module. By adjusting the resistance values of the resistor R10, the resistor R11, the resistor R12, and the resistor R13, the difference between the first input end and the second input end of the subtraction module can be amplified in proportion after subtraction, so as to obtain the difference signal after proportional amplification of the two induction detectors.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. The ventilation wind speed detection type fan air supply system is characterized by: include: Electric air valve pipe, cabinet fan, flexible pipe, reducer pipe, first manual regulating valve pipe, short pipe, wind speed measuring pipe, three-way pipe, second manual regulating valve pipe, head pipe and monitoring box; The electric air valve pipe is installed at the input end of the cabinet fan, the output end of the cabinet fan is connected to the small end of the reducer pipe through a flexible pipe, the large end of the reducer pipe is connected to one end of the short pipe through the first manual regulating valve pipe, the other end of the short pipe is connected to the air inlet end with the wind speed measuring pipe, the air outlet end with the wind speed measuring pipe is connected to the first end of the three-way pipe, the second end of the three-way pipe is connected to the input end of the sealing pipe through the second manual regulating valve pipe, and an air outlet is opened on the side of the sealing pipe; The wind speed measuring tube includes: a uniform wind guiding structure, a connecting tube body, a pitot tube and an inductive detector. The uniform wind guiding structure is installed in the air inlet end of the connecting tube body, the pitot tube is inserted into the air outlet end of the connecting tube body, the pitot tube is installed on the connecting tube body, the pitot tube is connected to the input end of the inductive detector, the inductive detector is installed on the connecting tube body, and the inductive detector is electrically connected to the control box; The inductive detector is electrically connected to a monitoring box, and the monitoring box is installed beside the inductive detector.

2. The ventilation wind speed detection type fan air supply system according to claim 1 is characterized in that: The monitoring box is provided with: a pressure signal processing circuit and a control circuit, the input end of the pressure signal processing circuit is connected to the output end of the inductive detector, and the output end of the inductive detector is connected to the first input end and the second input end of the control circuit.

3. The ventilation wind speed detection type fan air supply system according to claim 2 is characterized in that: There are two wind speed measuring tubes, and the pressure signal processing circuit includes: a first differential amplifier module, a second differential amplifier module, a subtraction module and an AD conversion module. The first input end and the second input end of the first differential amplifier module are respectively connected to the first output end and the second output end of an inductive detector, the first input end and the second input end of the second differential amplifier module are respectively connected to the first output end and the second output end of another inductive detector, the output end of the first differential amplifier module is connected to the first input end of the AD conversion module, the output end of the first differential amplifier module is connected to the first input end of the subtraction module, the output end of the second differential amplifier module is connected to the second input end of the subtraction module, the output end of the subtraction module is connected to the second input end of the AD conversion module, and the first output end and the second output end of the AD conversion module are respectively connected to the first input end and the second input end of the control circuit.

4. The ventilation wind speed detection type fan air supply system according to claim 3 is characterized in that: The inductive detector is a pressure-sensitive type, and is connected to the output end of the external power supply circuit through a controllable switch module, and the output end of the controllable switch module is connected to the output end of the control circuit.

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