Pointer type differential pressure detection device with circuit on-off control function

Abstract

The utility model provides a pointer type differential pressure detection device with a circuit on-off control function, and relates to the technical field of pressure detection and control, the pointer type differential pressure detection device comprises a differential pressure gauge main body and a pressure detection control assembly, the differential pressure gauge main body comprises a pointer and a dial plate, and the pressure detection control assembly comprises a setting pointer, a detection module and a pressure point setting mechanism. The pressure point setting mechanism is used for adjusting and setting the position of the pointer on the scale label in the dial plate, when the differential pressure gauge body detects the pressure difference, the pointer acts for pressure indication, and when the pointer reaches the position of the set pointer, the pointer is detected by the detection module, and the detection module outputs a signal to achieve the control purpose. The pressure detection and control functions are integrated, the precision is higher than that of a traditional scheme that a mechanical differential pressure gauge is matched with a mechanical pressure switch, the economical efficiency is higher than that of an electronic differential pressure gauge with control output, the switch pressure action point can be adjusted, a plurality of pressure detection control assemblies can be arranged, and a plurality of circuits or devices can be controlled at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure detection and control, in particular to a pointer type differential pressure detection device with a circuit on-off control function. Background Technique

[0002] At present, the general mechanical pointer differential pressure gauge only has the function of pressure detection and indication, without a control function. When in use, the operator manually operates the start and stop of the equipment according to the pressure indication value. When it is necessary to control other equipment according to the pressure value, generally, a mechanical pressure switch is used in combination or a differential pressure transmitter with an electronic switch quantity output is directly used.

[0003] For the scheme of using a mechanical differential pressure gauge in combination with a mechanical pressure switch, there is a certain error in the accuracy between the two devices, there is a difference between the switch action point and the displayed pressure on the meter, the accuracy of the pressure switch is low, and at the same time, when adjusting the pressure setting point of the mechanical pressure switch, the pressure cannot be accurately set and needs to be calibrated separately; the electronic differential pressure gauge has a high economic cost and the pressure setting operation is relatively cumbersome. In view of the above defects, this application is proposed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a pointer type differential pressure detection device with a circuit on-off control function, which integrates the switch control function and the pressure display, and solves the problems of low accuracy of the pressure switch caused by the combination of a mechanical differential pressure gauge and a mechanical pressure switch and the high cost of the electronic differential pressure gauge.

[0005] To solve the above problems, the utility model provides a pointer type differential pressure detection device with a circuit on-off control function, which includes a differential pressure gauge main body and a pressure detection and control component. The differential pressure gauge main body includes a pointer and a dial. The pressure detection and control component includes a setting pointer, a detection module and a pressure point setting mechanism. The pressure point setting mechanism is used to adjust the positions of the setting pointer and / or the detection module on the scale plate in the dial. When the differential pressure gauge main body detects a pressure difference, the pointer moves to indicate the pressure. When the pointer reaches the position of the setting pointer, it is detected by the detection module, and the detection module outputs a signal to achieve the control purpose.

[0006] According to an embodiment of the utility model, the detection module is a photoelectric switch, and can also be set as other similar non-contact detection sensors.

[0007] According to an embodiment of the utility model, a switch baffle is directly or indirectly connected to the pointer. When the switch baffle blocks the optical axis emitted by the photoelectric switch, the photoelectric switch outputs a signal.

[0008] According to an embodiment of the utility model, several groups of the pressure detection and control components are provided, such as one group or two groups, to achieve the control effect of multiple pressure points.

[0009] According to an embodiment of the present utility model, the pressure point setting mechanism includes a switch wheel and a driving mechanism. The detection module and the setting pointer are installed on the switch wheel, and the driving mechanism is used to drive the switch wheel to rotate.

[0010] According to an embodiment of the present utility model, the switch wheel is a switch gear. The driving mechanism includes a knob and a gear transmission assembly. The knob is connected to the switch gear through the gear transmission assembly, and the gear transmission is more stable and precise.

[0011] According to an embodiment of the present utility model, the gear transmission assembly includes a transmission gear and a knob gear. The diameters of both the transmission gear and the knob gear are smaller than that of the switch gear, achieving a precise adjustment effect.

[0012] According to an embodiment of the present utility model, the pointer type differential pressure detection device with circuit on-off control function further includes an audible and visual alarm component, and the audible and visual alarm component is electrically connected to the detection module.

[0013] According to an embodiment of the present utility model, the lengths of the pointer and the setting pointer are different, which is convenient for users to distinguish. It can also achieve the effect of being easy to distinguish by setting different colors and shapes.

[0014] According to an embodiment of the present utility model, the differential pressure gauge main body further includes a diaphragm assembly. The diaphragm assembly divides the internal space into a positive pressure chamber and a negative pressure chamber. Both the positive pressure chamber and the negative pressure chamber have interfaces, and can measure positive pressure, negative pressure, and differential pressure.

[0015] Preferably, this solution adopts a mechanical differential pressure gauge. Since the pressure detection function and the control function are independent of each other, and the pressure detection function is that the differential pressure gauge is mechanical. When the power supply is interrupted, the control function of the pressure detection control component fails, and the pressure detection function of the differential pressure gauge can be normally realized. While when the power supply of the traditional pure electronic detection and control equipment is interrupted, both the pressure detection and the control function will fail. This solution has a better emergency effect.

[0016] The beneficial effects of the present utility model are as follows: by integrating the detection module into the differential pressure gauge, the pressure detection and control functions are integrated into one. It has higher precision than the traditional mechanical differential pressure gauge with a mechanical pressure switch, and higher economy than the electronic differential pressure gauge with control output; the pressure indication of this solution is intuitive, the action is sensitive, the precision is high, the switching pressure action point can be adjusted, and it is convenient and intuitive to adjust through the knob. Multiple groups of pressure detection and control components can be set to simultaneously control multiple circuits or devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present utility model will be further described below with reference to the drawings and embodiments.

[0018] Figure 1Front structural schematic diagram of a pointer differential pressure detection device with circuit on / off control function;

[0019] Figure 2 is Figure 1 Cross-sectional structural schematic diagram at A-A in;

[0020] Figure 3 Back structural schematic diagram of a pointer differential pressure detection device with circuit on / off control function;

[0021] Figure 4 Structural schematic diagram of the pressure point setting mechanism. Detailed implementation manners

[0022] The following description is only used to disclose the present invention so that those skilled in the art can implement the present invention. The embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be applied to other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other schemes that do not deviate from the spirit and scope of the present invention.

[0023]

Embodiment 1

[0024] A pointer differential pressure detection device with circuit on / off control function includes a differential pressure gauge main body and a pressure detection and control component. Among them, the differential pressure gauge main body can adopt any pointer differential pressure gauge in the prior art, and with the cooperation of the pressure detection and control component, it can integrate the switch control function and pressure display into one, and use a knob to adjust and set the action pressure, and the setting method is simple and intuitive.

[0025] Such as Figure 1 , Figure 2 , in this embodiment, the differential pressure gauge main body includes a dial 1, a transparent cover 2, a pointer 3 and a case 12, and the diaphragm assembly 13 divides the internal space into a positive pressure chamber and a negative pressure chamber.

[0026] The pressure detection and control component includes a setting pointer 4, a detection module and a pressure point setting mechanism. The pressure point setting mechanism is realized by combining a switch gear 6, a transmission gear 5, a knob gear 19, a knob rod 8 and an adjustment knob 10.

[0027] It should be noted that in this solution, the gear transmission adjustment is adopted in the pressure point setting mechanism. In other embodiments, a chain wheel or other driving methods can also be used, or the switch wheel can be directly driven to rotate for adjustment.

[0028] Such as Figure 2 , a scale label is provided in the dial 1, and the pointer 3 and the setting pointer 4 are arranged in front of the scale label and on different planes.

[0029] In this embodiment, the detection module is an optoelectronic switch 9. It can be understood by those skilled in the art that the detection module can also be a non-contact detection module such as an ultrasonic sensor or an image sensor.

[0030] When a pressure difference is generated between the positive pressure chamber and the negative pressure chamber, the diaphragm assembly 13 starts to move, and the shrapnel assembly 15 connected to the diaphragm assembly 13 moves accordingly. The lead screw assembly 16 rotates under the attraction of the magnet at the end of the shrapnel assembly 15. The pointer 3 is connected to the lead screw assembly 16 through the pointer seat 11 and rotates synchronously for pressure indication.

[0031] At the same time, the pointer seat 11 also drives the switch baffle 7 to rotate together. When the pressure reaches the set point, that is, when the pointer 3 and the set pointer 4 are at the same pressure indication position, the switch baffle 7 blocks the optical axis emitted by the optoelectronic switch 9. The optoelectronic switch 9 outputs a signal, which is processed by the circuit and outputs a control signal to achieve the control purpose.

[0032] One end of the knob rod 8 is connected to the adjustment knob 10, and the other end is connected to the knob gear 19 and installed on the bracket 17. The transmission gear 5 and the switch gear 6 are also installed on the bracket 17. The knob gear 19 meshes with the transmission gear 5, and the transmission gear 5 meshes with the switch gear 6. The set pointer 4 and the optoelectronic switch 9 are fixed on the switch gear 6. When the adjustment knob 10 rotates, it drives the knob rod 8 and the knob gear 19 to rotate together. After being transmitted by the transmission gear 5, the switch gear 6 rotates in the same direction as the adjustment knob 10. At the same time, the optoelectronic switch 9 and the set pointer 4 rotate accordingly, realizing the function of setting the operating pressure.

[0033] In this embodiment, one or two sets of pressure detection and control components are provided. In other embodiments, the number of pressure detection and control components is adjusted according to needs.

[0034] The following are the usage steps of the device with two sets of pressure detection and control components:

[0035] Both groups of pressure detection and control components have two outputs, NO / NC, and can control multiple circuits / devices simultaneously. The case 12 is connected to an external air source, and a pressure difference is generated between the positive and negative cavities inside the case. Optionally, both the positive pressure cavity and the negative pressure cavity have interfaces to measure positive pressure, negative pressure, and differential pressure. The diaphragm assembly 13 starts to move under the action of air pressure, is transmitted through the elastic piece assembly 15, and the lead screw assembly 16 drives the pointer 3 to rotate through the pointer seat 11, realizing the pressure detection and indication function. Two switch gears 6 are installed on the bracket 17, and a slot-type photoelectric switch 9 and a setting pointer 4 are installed on each of the two switch gears 6. The switch baffle 7 is installed on the pointer seat 11 and rotates together with the pointer 3. When the switch baffle 7 passes through the U-shaped groove of the photoelectric switch 9 and blocks the optical axis, the photoelectric switch 9 generates a detected switch quantity signal. The signal is processed by the PCB board 14 and transmitted through the aviation connector 18 to an external device for control. There are two C-type relays (SPDT) on the PCB board 14 corresponding to the two photoelectric switches 9, which can control two groups of circuits.

[0036] Two transmission gears 5 are installed on the bracket 17, which are respectively engaged with the switch gears 6 on the left and right sides. At the same time, two knob gears 19 are also installed on the bracket 17, which are respectively engaged with the two transmission gears 5. The two knob gears 19 are respectively connected to two knob rods 8, and the other end of the knob rod 8 is connected to the adjustment knob 10 installed on the transparent cover 2. Rotating the adjustment knob 10, through the transmission of the knob rod 8, the knob gear 19, and the transmission gear 5, the switch gear 6 moves in the same direction as the adjustment knob 10, and the photoelectric switch 9 and the setting pointer 4 on the switch gear 6 also move accordingly, achieving the function of adjusting and indicating the switch action pressure.

[0037] Since the pressure detection function and the control function are independent of each other, the pressure detection function, that is, the differential pressure gauge, is mechanical. When the power supply is interrupted, the control function of the pressure detection and control component fails, and the pressure detection function of the differential pressure gauge can be normally realized. When the power supply of the traditional pure electronic detection and control device is interrupted, both the pressure detection and the control function will fail. This solution has a better emergency effect.

[0038] Embodiment 2, based on Embodiment 1, an audible and visual alarm component is added in this embodiment. Specifically, when the switch baffle 7 passes through the U-shaped groove of the photoelectric switch 9 and blocks the optical axis, the photoelectric switch 9 generates a detected switch quantity signal, and the signal is transmitted to the PCB board 14 for processing. There is a C-type relay (SPDT), a buzzer, and an LED lamp on the PCB board 14. When the photoelectric switch 9 outputs a signal to the PCB board 14, the buzzer will alarm and the LED lamp will flash, realizing the audible and visual alarm function.

[0039] Those skilled in the art should understand that the embodiments of the present utility model described above and shown in the accompanying drawings are only examples and do not limit the present utility model. The object of the present utility model has been completely and effectively achieved. The functions and structural principles of the present utility model have been demonstrated and explained in the embodiments. Without departing from the said principles, any variations and modifications can be made to the embodiments of the present utility model.

Claims

1. A pointer-type differential pressure detection device with circuit on-off control function, characterized in that: The differential pressure gauge comprises a main body and a pressure detection control component, wherein the main body comprises a pointer (3) and a dial (1), and the pressure detection control component comprises a setting pointer (4), a detection module and a pressure point setting mechanism, wherein the pressure point setting mechanism is used to adjust the position of the setting pointer (4) on a scale plate in the dial (1); when the main body of the differential pressure gauge detects a pressure difference, the pointer (3) moves to indicate the pressure; when the pointer (3) reaches the setting pointer (4) position, it is detected by the detection module, and the detection module outputs a signal to achieve the control purpose.

2. The pointer-type differential pressure detection device with circuit on-off control function according to claim 1 is characterized in that: The detection module is a photoelectric switch (9).

3. The pointer-type differential pressure detection device with circuit on-off control function according to claim 2 is characterized in that: A switch baffle (7) is installed on the pointer (3). When the switch baffle (7) blocks the optical axis emitted by the photoelectric switch (9), the photoelectric switch (9) outputs a signal.

4. The pointer-type differential pressure detection device with circuit on-off control function according to any one of claims 1 to 3, characterized in that: The pressure detection control components are provided with several groups to achieve multiple pressure point control effects.

5. The pointer-type differential pressure detection device with circuit on-off control function according to claim 4 is characterized in that: The pressure point setting mechanism comprises a switch wheel and a driving mechanism, the detection module and the setting pointer (4) are mounted on the switch wheel, and the driving mechanism is used to drive the switch wheel to rotate.

6. The pointer-type differential pressure detection device with circuit on-off control function according to claim 5, characterized in that: The switch wheel is a switch gear (6), and the drive mechanism comprises a knob (10) and a gear transmission assembly, wherein the knob (10) is connected to the switch gear (6) via the gear transmission assembly.

7. The pointer-type differential pressure detection device with circuit on-off control function according to claim 6, characterized in that: The gear transmission assembly comprises a transmission gear (5) and a knob gear (19), and the diameters of the transmission gear (5) and the knob gear (19) are both smaller than the switch gear (6).

8. The pointer-type differential pressure detection device with circuit on-off control function according to any one of claims 5 to 7, characterized in that: The pointer-type differential pressure detection device with circuit on-off control function also includes an audible and visual alarm component, which is electrically connected to the detection module.

9. The pointer-type differential pressure detection device with circuit on-off control function according to any one of claims 5 to 7, characterized in that: The pointer (3) and the setting pointer (4) have different lengths.

10. The pointer-type differential pressure detection device with circuit on-off control function according to any one of claims 5 to 7, characterized in that: The differential pressure gauge body also includes a diaphragm assembly (13), and the diaphragm assembly (13) divides the internal space into a positive pressure chamber and a negative pressure chamber, and both the positive pressure chamber and the negative pressure chamber have interfaces.

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