Differential pressure type flow switch with sound-light alarm function

Abstract

The utility model provides a differential pressure type flow switch with a sound-light alarm function, which relates to the technical field of differential pressure type flow switches and comprises a transmission frame and an alarm module, the alarm module comprises a trigger switch, a resistor module, an alarm element, an output loop and an alarm removal module, and the trigger switch, the resistor module, the alarm element and the output loop are electrically connected. When the pressure difference in the flow switch reaches a set value, the transmission frame acts to enable the trigger switch to act, the alarm element comprises an alarm indicator lamp and a buzzer, the alarm relieving module is arranged on a loop of the buzzer and used for relieving alarm of the buzzer and avoiding long-time noise interference, and the resistor module is used for improving power and reducing the noise interference. Therefore, components of the circuit cannot be damaged due to overload.

Description

TECHNICAL FIELD

[0001] The utility model relates to differential pressure flow switch technical field especially differential pressure flow switch with sound and light alarm function. BACKGROUND

[0002] The emergence of flow differential pressure switch is to meet the demand of accurate monitoring of fluid system. The commonly used adjustable differential pressure flow switch has low load capacity of SPDT dry contact output due to the limitation of its structure, and has no signal prompt except the dry contact output signal, so it is not easy to find the fault in time. The commonly used sound and light alarm function is realized by 555 timer and external resistance, capacitor, and the like structure, such as multivibrator, to realize sound and light alarm. This way leads to large size of circuit board and high cost due to complex principle design, and is not suitable for introducing sound and light alarm function into mechanical switch. In addition, when the sound and light alarm function is triggered, there is noise interference, which will affect the staff if it cannot be closed in time. The present application is proposed to solve the above problems. SUMMARY

[0003] The utility model discloses a differential pressure flow switch with sound and light alarm function, which can send sound and light alarm when the equipment fails, has simple structure and low cost, and solves the problems of no alarm function and the alarm effect cannot be removed in time of the traditional differential pressure switch.

[0004] To solve the above problems, the utility model provides a differential pressure flow switch with sound and light alarm function, which comprises a transmission frame and an alarm module, the alarm module comprises a trigger switch, a resistance module, an alarm element, an output circuit and an alarm removal module, the trigger switch, the resistance module, the alarm element and the output circuit are electrically connected, when the differential pressure in the flow switch reaches the set value, the transmission frame acts, and the trigger switch acts, the alarm element comprises a warning indicator lamp and a buzzer, the alarm removal module is arranged on the circuit of the buzzer and is used for removing the alarm of the buzzer, so that long-time noise interference is avoided, and the resistance module is used for improving power, so that the circuit will not damage components due to overload.

[0005] According to an embodiment of the utility model, the alarm removal module adopts a mechanical button, such as a mechanical self-locking button.

[0006] According to an embodiment of the utility model, the warning indicator lamp is connected in parallel with a standby circuit, so that even if the warning indicator lamp is damaged, the output of the signal will not be affected, and the stability of the circuit output is ensured.

[0007] According to an embodiment of the utility model, a resistance is arranged on the standby circuit and is used as a load.

[0008] According to an embodiment of the utility model, the output circuit comprises a relay.

[0009] According to an embodiment of the utility model, the output circuit still includes plug -in triode, plug -in triode is connected with relay.

[0010] According to an embodiment of the utility model, the both ends of relay are connected with diode in parallel, for preventing reverse connection, plays the protection function.

[0011] According to an embodiment of the utility model, the trigger switch is micro -switch or dry reed.

[0012] According to an embodiment of the utility model, the differential pressure flow switch with sound and light alarm function further includes a voltage regulating module.

[0013] The utility model discloses a beneficial effect is, through setting up sound and light alarm module, can determine the switch is in which state through indicator light or sound at any time, when the pressure difference reaches the set value, transmission frame directly triggers alarm switch, realizes sound and light alarm, makes equipment failure can be discovered in time, can determine the switch is in which state through indicator light or sound at any time, and still be provided with release alarm module, can release the alarm of buzzer after alarm, avoids long time noise interference, the alarm module in the scheme and the differential pressure flow switch this kind of mechanical switch features combination and development design, small, low in cost, and after test and verification has higher practicality. DRAWINGS

[0014] The utility model is further illustrated below in connection with the drawings and examples.

[0015] Figure 1 It is the whole structure schematic diagram of differential pressure flow switch with sound and light alarm function of alarm module,

[0016] Figure 2 It is the sectional structure schematic diagram of differential pressure flow switch with sound and light alarm function,

[0017] Figure 3 It is the structure schematic diagram at PCB,

[0018] Figure 4 It is the circuit schematic diagram of alarm module. PREFERRED EMBODIMENT

[0019] The following description is only used to disclose the utility model to enable the person skilled in the art to implement the utility model. The examples in the following description are only as examples, and the person skilled in the art can think of other obvious modifications. The basic principles of the utility model defined in the following description can be applied to other implementation, modification, improvement, equivalent and other schemes without departing from the spirit and scope of the utility model.

[0020] Differential pressure flow switch with sound and light alarm function, such asFigures 1-4 It includes a high-voltage connector 1, a base 2, a low-voltage connector 3, a voltage regulating module 9, a transmission frame 5, a PCB board 6, and an alarm module. The alarm module includes a trigger switch trigger wiring hole 4, a trigger switch 201, a resistor module, an alarm element 101, an output circuit, an alarm cancellation module, and a power supply and PCB output wiring hole 8.

[0021] This solution combines the features of an alarm module with those of a differential pressure flow switch, resulting in a small size, low cost, and proven practicality through testing.

[0022] The main body of the differential pressure flow switch operates on the same principle as a traditional differential pressure switch. The pressure regulating module 9 is typically a differential spring, which can be customized to suit different measurement ranges. The function of the differential spring is to set the differential pressure threshold between the high-pressure connector 1 and the low-pressure connector 3. The connector components can be made of brass or stainless steel, and the elastic element is selected based on the application scenario. For example, if the elastic element is a rubber diaphragm (EPDM or NBR), the maximum withstandable differential pressure is 16 bar.

[0023] The trigger switch 201 is a magnetically controlled switch, such as a micro switch or a reed switch.

[0024] The alarm element 101 includes an alarm indicator light and a buzzer.

[0025] Trigger switch 201, resistor module, and alarm element 101 are all mounted on PCB board 6 and have an output circuit. The output circuit includes a relay and a plug-in transistor. The plug-in transistor is connected to the relay, and diode D4 is connected in parallel across the two ends of the relay to prevent reverse connection. This solution adds a relay output function to the audible and visual alarm circuit. The load capacity can be further improved according to the actual working conditions. Compared with the traditional dry contact output, the relay output has a significantly longer service life as proven by actual test results.

[0026] When the differential pressure in the differential pressure flow switch reaches the set value, the transmission frame 5 is activated, causing the trigger switch 201 to activate. In the circuit diagram, COM2 and NO2 are connected, the buzzer (buzzer1 in the circuit diagram) is energized to sound an alarm, LED2 is energized to light up, and an electrical signal is given to the transistor base, which in turn causes the relay to activate.

[0027] The alarm deactivation module is located in the buzzer circuit, preferably using a mechanical button 7 (SW2 in the circuit diagram) to deactivate the buzzer alarm. The operator can deactivate the alarm by pressing button SW2 in the circuit, avoiding prolonged noise interference. A resistor module is used to increase power, such as... Figure 4 R2 and R4 in the circuit ensure that the components are not damaged due to overload. The resistor module can be a plug-in resistor, which is easy to install on the PCB board 6.

[0028] The alarm indicator LED2 is connected in parallel with a resistor R8, so that even if the alarm indicator is damaged, the signal output will not be affected, thus ensuring the stability of the circuit output. In other embodiments, a resistor can also be connected in parallel at LED1.

[0029] Example 2:

[0030] Based on Example 1, this example also includes a signal indicator light. The signal indicator light and the alarm indicator light use LEDs of different colors, namely green LED1 and red LED2. The red light indicates that the switch is activated, and the green light indicates that the switch is reset. In case of a fault, the problem can be quickly identified.

[0031] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations and modifications.

Claims

1. Differential pressure flow switch with acousto-optic alarm function, characterized in that: The differential pressure flow switch with sound-light alarm function comprises a transmission frame (5) and an alarm module, the alarm module comprises a trigger switch (201), a resistance module, an alarm element (101), an output loop and a release alarm module, the trigger switch (201), the resistance module, the alarm element (101) and the output loop are electrically connected, the alarm element (101) comprises a warning indicator light and a buzzer, the release alarm module is arranged on the loop of the buzzer and is used for releasing the alarm of the buzzer, and the resistance module is used for improving power so that the circuit will not damage components due to overload.

2. The differential pressure flow switch with acousto-optic alarm function according to claim 1, characterized in that: The release alarm module adopts a mechanical button (7).

3. The differential pressure flow switch with acousto-optic alarm function according to claim 1, characterized in that: The warning indicator light is connected with a standby circuit in parallel, and abnormality of the switch caused by damage of the indicator light is prevented.

4. The differential pressure flow switch with acousto-optic alarm function according to claim 3, characterized in that: A resistance is arranged on the standby circuit.

5. The differential pressure flow switch with acousto-optic alarm according to any one of claims 1-4, characterized in that: The output loop comprises a relay.

6. The differential pressure flow switch with acousto-optic alarm function according to claim 5, characterized in that: The output loop further comprises a triode connected with the relay.

7. The differential pressure flow switch with acousto-optic alarm function according to claim 6, characterized in that: Diodes are connected in parallel at two ends of the relay.

8. The differential pressure flow switch with acousto-optic alarm according to any one of claims 1-4, characterized in that: The trigger switch (201) is a microswitch or a dry reed.

9. The differential pressure flow switch with acousto-optic alarm according to any one of claims 1-4, characterized in that: The differential pressure flow switch with sound-light alarm function further comprises a voltage regulation module (9).

Images