Intelligent pressure switch

Abstract

The utility model relates to the technical field of intelligent switches, in particular to an intelligent pressure switch, which comprises a casing and a display cover plate, the casing is a stainless steel casing, a metal shielding layer is arranged on the back of the display cover plate, and the metal shielding layer and the stainless steel casing are connected in a lead welding mode to form closed-loop shielding. The front end of the shell is provided with an isolating membrane charging pressure resistance type pressure sensor, and the shell is further internally provided with an amplifier, an A / D converter and an anti-interference circuit. The intelligent pressure switch is strong in anti-interference capability, is not liable to cause safety problems such as faults, and can be widely applied to industries such as hydropower, tap water, petroleum, chemical engineering, machinery, hydraulic pressure and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of intelligent switches, in particular to an intelligent pressure switch. Background Art

[0002] The intelligent pressure switch is an intelligent digital pressure measurement and control product that integrates pressure measurement, display, output and control. It is generally an all-electronic structure. The front end uses an oil-filled piezoresistive pressure sensor with an isolation membrane. The output signal is amplified and processed by a high-precision, low-temperature drift amplifier, and sent to a high-precision A / D converter to convert it into a digital signal that can be processed by a microprocessor. The signal after calculation and processing controls the two-way switch to measure and control the pressure of the control system. It can be widely used in hydropower, tap water, petroleum, chemical, machinery, hydraulic and other industries to measure, display and control the pressure of fluid media. In the prior art, the shell of a side-display intelligent pressure switch is an aluminum shell, and the display cover is just an ordinary bakelite without a metal shielding layer; the shell of another intelligent pressure switch is a stainless steel shell, but the display head shell material is nylon, and there is no metal shielding, which makes the existing pressure switch insufficient in anti-interference ability. When subjected to external interference, false alarms may occur, resulting in unstable or erroneous output signals, which in turn lead to misoperation, or system failures and even safety issues. Utility Model Content

[0003] The utility model provides an intelligent pressure switch to solve the problems existing in the above-mentioned prior art, that is, to improve the anti-interference ability of pressure monitoring and control of the intelligent pressure switch. The specific technical solution is as follows:

[0004] An intelligent pressure switch is a fully electronic structure, comprising a shell and a display cover plate, wherein the shell is a stainless steel shell, a metal shielding layer is attached to the back of the display cover plate, and the metal shielding layer is connected to the stainless steel shell by wire welding to form a closed-loop shielding. The front end of the shell adopts an oil-filled piezoresistive pressure sensor with an isolation membrane, a built-in amplifier, an A / D converter and an anti-interference circuit, and a four-digit LED real-time digital display of the pressure value is used and is set to be displayed on the side.

[0005] Preferably, the display window, indicator light window and key window on the back of the display cover plate are not provided with a metal shielding layer.

[0006] Preferably, the housing of the intelligent pressure switch is provided with a node action light emitting diode.

[0007] Preferably, the intelligent pressure switch has two-way switch output and a load capacity of 1.2A.

[0008] Preferably, the rotatable angle of the housing of the intelligent pressure switch is set to 330°.

[0009] Preferably, the intelligent pressure switch is provided with adjustment buttons and on-site setting parameters.

[0010] Preferably, the control accuracy of the intelligent pressure switch is less than or equal to ±0.25% FS, the display accuracy is ±0.1% FS, the display range is -1999 to 9999, and the lead wire method is a five-pin connector.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the control accuracy and display accuracy are much higher than those of the prior art, and the control is convenient, the hysteresis is small, and the application is wide. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a front view of an intelligent pressure switch of the utility model;

[0013] Figure 2 This is a side view of an intelligent pressure switch of the utility model;

[0014] Figure 3 The figure is a functional setting diagram of an intelligent pressure switch of the utility model. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] As shown in the accompanying drawings, the utility model provides an intelligent pressure switch, which is a fully electronic structure, including a shell and a display cover. The shell is a stainless steel shell, and a metal shielding layer is attached to the back of the display cover. The metal shielding layer and the stainless steel shell are connected by wire welding to form a closed-loop shielding. The front end of the shell adopts an oil-filled piezoresistive pressure sensor with an isolation membrane, and has a built-in high-precision, low-temperature drift amplifier, A / D converter and anti-interference circuit. It uses a four-digit LED real-time digital display of the pressure value and is set to be displayed on the side.

[0017] Exemplarily, the display window, indicator light window and key window on the back of the display cover are not provided with a metal shielding layer.

[0018] Exemplarily, the control accuracy of the intelligent pressure switch is less than or equal to ±0.25% FS, the display accuracy is ±0.1% FS, the display range is -1999 to 9999, and the lead wiring method is a five-pin connector.

[0019] Exemplarily, the functions including pressure preset switching point and delayed switching output can set the pressure threshold. When the measured pressure reaches or exceeds the value, the switching output is triggered to avoid frequent switching and jitter. That is, a hysteresis interval is set based on the preset switching point, so that the output signal has stable switching behavior when the pressure increases and decreases.

[0020] Exemplarily, the housing of the intelligent pressure switch is provided with a node action light emitting diode for easy observation; and the rotatable angle of the housing of the intelligent pressure switch is set to 330°.

[0021] For example, the intelligent pressure switch is provided with buttons including ▲ and ▼ for adjustment and on-site parameter setting; the switch value can be set arbitrarily between zero and full scale; and the intelligent pressure switch has two-way switch output with a load capacity of 1.2A; the analog output is optional at 4~20mA.

[0022] For example, the intelligent pressure switch can be directly installed on the hydraulic pipeline through the pressure pipe joint DIN3582 external thread G1 / 4. In critical applications, such as severe vibration or impact, the pressure pipe joint can be mechanically decoupled through a micro hose.

[0023] For example, shielded wires are required for electrical connection of the intelligent pressure switch. If a micro hose is used for installation, the housing must be grounded separately and direct proximity to user devices or wiring of electrical and electronic devices that may cause interference should be avoided as much as possible.

[0024] For example, as shown in Figure 2, the intelligent pressure switch has two switch outputs, each of which can be set with one pressure switch point and one opening delay value. The corresponding output will switch when the pull-in value of the switch point is reached and will recover when the pressure drops below the release value.

[0025] AL1H is the pull-in value of switch 1. When the pressure reaches this point, it is pulled in and the indicator light is on. AL1L is the release value of switch 1. When the pressure reaches this point, it is disconnected and the indicator light is off. AL1D is the action delay of switch 1, that is, the number of seconds you must wait before switching. AL2H is the pull-in value of switch 2. When the pressure reaches this point, it is pulled in and the indicator light is on. AL2L is the release value of switch 2. When the pressure reaches this point, it is disconnected and the indicator light is off. AL2D is the action delay of switch 2, that is, the number of seconds you must wait before switching.

[0026] The switch point is determined by the configuration of the pull-in value and the release value. When the pull-in value is greater than the release value, it is the upper limit alarm output, that is, the normally open function; when the pull-in value is less than the release value, it is the lower limit alarm output, that is, the normally closed function; the difference between the pull-in value and the release value is the hysteresis of the switch point.

[0027] In a possible embodiment, switch point 1 is set as the upper limit alarm output, which is energized at 4MPa and disconnected at less than 3.95MPa, with a switching delay of 3 seconds; switch 2 is set as the lower limit alarm output, which is disconnected at 10MPa and energized at less than 9.95MPa, with a switching delay of 10 seconds:

[0028] Enter the menu and set: AL1H=4.00, AL1L=3.95, AL1D=3, AL2H=9.95, AL2L=10.00, AL2D=10;

[0029] Press the "mode" key;

[0030] "LOCK" is displayed, prompting you to enter the password;

[0031] Press the ▲ or ▼ key to enter the password "1";

[0032] Press the "mode" key to confirm;

[0033] Press the ▲ or ▼ key to scroll up or down to select the menu (AL1H, AL1L, AL1D, AL2H, AL2L, AL2D, END);

[0034] Press the "mode" key to enter the selected menu;

[0035] Press the ▲ or ▼ key to change the setting;

[0036] Press the "mode" key to confirm, and if necessary, use the ▲ or ▼ key to select other menus for modification;

[0037] After the modification is completed, select the "END" menu and press the "mode" key to confirm the save and exit;

[0038] If no key is pressed for 30 seconds, the setting state will be automatically exited, but the modified data will not be saved.

[0039] The above description is only for the purpose of clearly illustrating the examples of the present invention, and is not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. An intelligent pressure switch, comprising a housing and a display cover, It is characterized in that The shell is a stainless steel shell, and a metal shielding layer is attached to the back of the display cover. The metal shielding layer is connected to the stainless steel shell by wire welding to form a closed-loop shielding. The front end of the shell adopts an oil-filled piezoresistive pressure sensor with an isolation membrane, a built-in amplifier, an A / D converter and an anti-interference circuit, and a four-digit LED real-time digital display of the pressure value, which is set to be displayed on the side.

2. An intelligent pressure switch according to claim 1, It is characterized in that The display window, indicator light window and key window on the back of the display cover plate are not provided with a metal shielding layer.

3. An intelligent pressure switch according to claim 1, It is characterized in that The housing of the intelligent pressure switch is provided with a node action light emitting diode.

4. The intelligent pressure switch according to claim 1, It is characterized in that The intelligent pressure switch has two-way switch output and a load capacity of 1.2A.

5. The intelligent pressure switch according to claim 1, It is characterized in that The rotatable angle of the housing of the intelligent pressure switch is set to 330°.

6. The intelligent pressure switch according to claim 1, It is characterized in that The intelligent pressure switch is provided with a calibration button and on-site setting parameters.

7. The intelligent pressure switch according to claim 1, It is characterized in that The control accuracy of the intelligent pressure switch is less than or equal to ±0.25% FS, the display accuracy is ±0.1% FS, the display range is -1999 to 9999, and the lead wire method is a five-pin connector.

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