CN216246963U - Pressure sensor with double-path redundant output - Google Patents

Abstract

The utility model discloses a pressure sensor with double-path redundant output, which comprises a shell, a pressure port fixed at one end of the shell and an adapter fixed at the other end of the shell, wherein the pressure port is connected with the pressure port; a diaphragm is arranged at one end of the pressure port, a silicon strain gauge is arranged on the outer surface of the diaphragm, and the diaphragm and the silicon strain gauge are arranged in the shell; the pressure port is provided with a medium hole along the axis, and the inner end of the medium hole is communicated into the diaphragm; a circuit board is arranged in the shell, 4 wires are connected to the circuit board and connected with a rear end connector, 2 wires are used for supplying power, and the other 2 wires are used as a first output end and a second output end; the silicon strain gauge is electrically connected with the circuit board. The pressure sensor has double-path redundant output, so that the equipment can judge whether the sensor works normally or not and whether pressure measurement is accurate or not, and can give an alarm at any time when a fault occurs, thereby improving the safety of high-altitude operation and solving the problem of pressure measurement of a forklift and a high-altitude vehicle.

Description

Pressure sensor with double-path redundant output

Technical Field

The utility model relates to pressure sensing measurement, in particular to a pressure sensor with double-path redundant output.

Background

The existing domestic pressure measurement technology comprises several types:

(1) the method comprises the following steps that a diffused silicon oil filling technology is adopted, a silicon chip is a sensor capable of sensing pressure, in order to realize isolation from a measuring medium, a stainless steel corrugated diaphragm needs to be welded, then silicon oil is filled between the diaphragm and the pressure sensing silicon chip, when pressure exists, the pressure is applied to the corrugated diaphragm and is transmitted to the silicon oil through the corrugated diaphragm, the silicon oil transmits the pressure to the silicon chip, and the silicon chip outputs signals to a sintering pin and transmits the signals to a subsequent signal processing circuit;

(2) in industrial environment, the pressure range of the sensor with the principle is 100KPA to 35Mpa, which is relatively universal, but when the sensor is used in the fields of a forklift, a high-altitude vehicle and the like, the pressure sensor is easy to damage due to instant high-pressure impact;

(3) in other sensor technologies, such as a sputtering film technology, a core body of a sputtering film needs to be welded on a pressure base, leakage hidden danger exists, in addition, the output sensitivity is low, so that an amplifying circuit needs high amplification factor, and finally, the stability of a product is poor;

(4) in addition, the pressure range of the ceramic thick film technology and the like is between 500kpa and 5Mpa, the pressure range (usually the pressure range of 25-60 Mpa) of a forklift and a high-altitude vehicle cannot be met, and meanwhile, when the ceramic thick film technology and the high-altitude vehicle are packaged on a stainless steel shell, a sealing ring is needed for sealing, so that the potential leakage hazard exists;

(5) domestic pressure sensors are generally single-path voltage or current output, and products with dual-path redundant output are not available.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides the pressure sensor with double-path redundant output, and the pressure sensor has double-path redundant output, so that equipment can judge whether the sensor works normally and the pressure measurement is accurate, and can give an alarm at any time when a fault occurs, thereby improving the safety of overhead operation and solving the problem of pressure measurement of a forklift and an overhead truck.

In order to achieve the technical purpose, the utility model adopts the following technical scheme: a dual-path redundant output pressure sensor comprises a shell, a pressure port fixed at one end of the shell and an adapter fixed at the other end of the shell;

a diaphragm is arranged at one end of the pressure port, a silicon strain gauge is arranged on the outer surface of the diaphragm, and the diaphragm and the silicon strain gauge are arranged in the shell; the pressure port is provided with a medium hole along the axis, and the inner end of the medium hole is communicated into the diaphragm;

a circuit board is installed in the shell, the circuit board is electrically connected with 2 connectors, the outer end parts of the 2 connectors are located in the adapter, and the 2 connectors are used as a first output end and a second output end; the silicon strain gauge is electrically connected to the circuit board.

Further, the pressure port further comprises a connecting bolt, one side of the connecting bolt is provided with an outer connecting portion, the other side of the connecting bolt is provided with an inner connecting portion, the outer connecting portion is fixed with a threaded head, the threaded head is connected with high-altitude equipment, and the inner connecting portion is connected with the diaphragm.

Furthermore, an outer connecting section is arranged on the outer wall of the outer connecting part, and the thread head is fixed on the outer connecting section; an annular groove is formed in the outer wall surface of the outer connecting portion, and a sealing ring is arranged in the groove.

Furthermore, the outer wall of the inner connecting portion is provided with an inner embedding portion, the size of the inner embedding portion is smaller than that of the inner connecting portion, an inner step surface is formed between the inner embedding portion and the inner connecting portion, the inner embedding portion extends into the shell, and the port wall of the shell abuts against the inner step surface.

Further, an inner connecting section is fixed on the outer wall of the inner embedding part, and the diaphragm is fixed on the inner connecting section.

Further, the adapter comprises a fixing part and a connecting part, wherein a ring groove is formed in the circumference of the outer wall of the fixing part, one end of the shell abuts against the inside of the ring groove, and an external thread is arranged on the outer wall of the connecting part; the fixing part and the shaft core of the connecting part are provided with shaft holes, and the inner wall of each shaft hole is provided with two concave holes.

Furthermore, the circuit board is electrically connected with a power supply anode and a power supply cathode, and the power supply anode and the power supply cathode are both arranged in the shaft hole of the adapter

In conclusion, the utility model achieves the following technical effects:

1. the whole pressure sensing device is formed by processing a whole 17-4 stainless steel bar, measured hydraulic oil medium is introduced from a medium hole at the front end, weak deformation is transmitted to a silicon strain gauge on the other side through a processed stainless steel diaphragm, the silicon strain gauge transmits a signal to a circuit board, an electronic bin formed by a shell is completely isolated from a pressure medium bin through the 17-4 stainless steel diaphragm, no silicone oil is filled in the electronic bin, no sealing element is arranged, the hidden danger of leakage is thoroughly avoided, and the product can stably work for a long time;

2. the pressure sensor has double-path redundancy output, so that the equipment can judge whether the sensor works normally or not, the pressure measurement is accurate or not, the alarm is given at any time when a fault occurs, and the safety of overhead operation is improved; according to the utility model, from the structural principle, the product performance, the service life and the reliability are improved by means of the stainless steel material, the circuit design meets the requirement of double-circuit redundancy design, and the double-circuit redundancy design can be widely applied to a scissor truck and a high-altitude truck;

3. the utility model has two paths of redundant outputs, 4 lines are connected to a rear end plug-in unit, 2 lines are used for supplying power, the other 2 lines are used as a first output end and a second output end, the two paths of outputs are respectively 4-20mA and 20-4mA, or the voltage outputs are respectively 0.5-4.5V and 4.5V to 0.5V, or the voltage outputs are respectively 0-5V and 5V to 0V;

4. the front end mounting thread of the utility model is M14X1.5 or G1/4, and the rear end electrical interface is an M12X 14 core or 5 core electrical connector interface.

Drawings

FIG. 1 is a schematic cross-sectional view of a sensor provided by an embodiment of the present invention;

FIG. 2 is a side view of a pressure port;

FIG. 3 is a schematic cross-sectional view of a pressure port;

FIG. 4 is a side view of the adapter;

FIG. 5 is a schematic view of the adapter housing AA in section;

fig. 6 is a schematic sectional view of the adapter housing BB.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Example (b):

a dual-path redundant output pressure sensor is shown in figure 1 and comprises a shell 2, a pressure port 1 fixed at one end of the shell 2, and an adapter 3 fixed at the other end of the shell 2; wherein, the shell 2 is used for installing a circuit board (not shown), the pressure port 1 is used for connecting with high-altitude operation equipment, such as a fork-lift truck, a high-altitude vehicle and the like, and the adapter 3 is used for connecting with subsequent electrical equipment.

As shown in fig. 2, which is a side view of the pressure port 1, a diaphragm 109 is disposed at one end of the pressure port 1, a silicon strain gauge (not shown) is disposed on an outer surface of the diaphragm 109, the silicon strain gauge is electrically connected to a circuit board, and the diaphragm 109 and the silicon strain gauge are disposed inside a housing 2 (shown in fig. 1); as shown in fig. 3, which is a schematic cross-sectional view of the pressure port 1, the pressure port 1 is provided with a medium hole 110 along an axis, and an inner end of the medium hole 110 is communicated to the inside of the diaphragm 109.

A circuit board (not shown) is installed in the housing 2, the circuit board and the hydraulic oil medium are not in contact with each other and are isolated by the diaphragm 109, and the diaphragm 109 has the following functions: hydraulic oil medium enters from the medium hole 110 and always flows into the diaphragm 109, the hydraulic oil transmits the pressure condition to the diaphragm 109, the diaphragm 109 is a stainless steel diaphragm, slight deformation is generated after pressure, the deformation is transmitted to the silicon strain gauge, the silicon strain gauge transmits a signal to the circuit board, an electronic bin formed by the shell 2 is completely isolated from a pressure medium bin formed by a pressure port through the 17-4 stainless steel diaphragm, no silicone oil is filled in the electronic bin, no sealing element is arranged, the hidden danger of leakage is thoroughly avoided, and the product can stably work for a long time. Especially, when the shearing forklift is used on high-altitude operation equipment, for example, the pressure of the shearing forklift needs to be measured so as to judge whether a sensor of the shearing forklift works normally.

The circuit board has electrically connected thereto 2 connectors, the outer ends of the 2 connectors being located within the adapter 3, the 2 connectors being provided as a first output terminal 4 and a second output terminal 5 (visible in fig. 4). After the pressure signal passes through the silicon strain gauge and the circuit board, the diaphragm 109 outputs the pressure signal through the first output end 4 and the second output end 5, double-path redundant output is achieved, and therefore the device can judge whether the sensor works normally or not, judge whether pressure measurement is accurate or not, give an alarm at any time when a fault occurs, and improve safety of high-altitude operation.

As shown in fig. 2 and 3, the pressure port 1 further includes a connecting bolt 101, one side of the connecting bolt 101 is provided with an outer connecting portion 102, the other side is provided with an inner connecting portion 106, the outer connecting portion 102 is fixed with a threaded head 105, the threaded head 105 is connected with high-altitude equipment, and the inner connecting portion 106 is connected with the diaphragm 109.

Further, the outer wall of the outer connecting portion 102 is provided with an outer connecting section 104, and a thread head 105 is fixed on the outer connecting section 104; an annular groove 103 is formed in an outer wall surface of the outer connecting portion 102, and a seal ring (not shown) is disposed in the groove 103. The thread head 105 is connected to high-altitude equipment, the outer connecting section 104 can provide space and distance for connection, and the sealing ring can abut against the high-altitude equipment to realize sealing and prevent leakage.

Further, the outer wall of the inner connecting portion 106 is provided with an inner fitting portion 107, the size of the inner fitting portion 107 is smaller than that of the inner connecting portion 106, an inner step surface 111 is formed between the inner fitting portion 107 and the inner connecting portion 106, the inner fitting portion 107 extends into the housing 2, and the port wall of the housing 2 abuts against the inner step surface 111. In the present embodiment, the step surface 110 and the housing 2 are fixedly connected by welding, which not only improves the strength of the connection, but also ensures the sealing inside the housing 2.

An inner connecting section 108 is fixed on the outer wall of the inner embedding part 107, the diaphragm 109 is fixed on the inner connecting section 108, and the inner connecting section 108 prolongs the flowing distance of the medium, so that a certain distance and space are provided for the transmission of pressure, and the detection accuracy is improved.

In the embodiment, the whole pressure port 1 is integrally processed by 17-4 stainless steel, so that the strength of the whole pressure port is improved.

The medium hole 110 is from the outer wall of the threaded head 105 to the inner section of the connecting bolt 101, compared with the inner connecting section 108 and the inner section of the diaphragm 109, the diameter is larger, the large diameter section receives more hydraulic oil, and the small diameter section concentrates the hydraulic oil pressure to be transmitted to the diaphragm, so that the sensing precision of the diaphragm is improved.

As shown in fig. 4, 5 and 6, the housing of the adapter 3 includes a fixing portion 302 and a coupling portion 301, a ring groove 303 is formed on the circumference of the outer wall of the fixing portion 302, one end of the housing 2 abuts against the ring groove 303, and the housing 2 and the ring groove 303 are welded together to realize high-strength connection and sealing, and the outer wall of the coupling portion 301 is provided with external threads for connecting with electrical equipment; the shaft holes are opened on the shaft core of the fixing part 302 and the coupling part 301, two concave holes 304 are opened on the inner wall of the shaft hole, 4 joints in this embodiment are installed on an epoxy resin sealing gasket (not shown), and the epoxy resin sealing gasket is fixed in the concave holes 304.

The circuit board is also electrically connected with a power positive electrode 6 and a power negative electrode 7, as shown in fig. 4, the power positive electrode 6 and the power negative electrode 7 are both arranged in the shaft hole of the adapter 3 (the power positive electrode 6 and the power negative electrode 7, the first output end 4 and the second output end 5 are not shown in fig. 1).

The thread head 105 of the pressure port 1 is also provided with a damper, and a hole for allowing a hydraulic oil medium to pass through is formed in the damper, so that overload impact resistance is enhanced. The middle of the damping plug is provided with a small hole which can play a role in buffering instant pressure impact.

The outer end of the threaded head 105 is provided with an ED gasket for sealing, and the ED gasket plays a role in sealing pressure after installation.

The processing of the utility model adopts the following flow: stainless steel processing piece, membrane surface treatment, silk screen printing, sintered glass, strain gauge pasting, strain gauge sintering, aging, bonding circuit board, bonding wire, testing, amplifying board adding, temperature compensation and calibration, double-path output testing, shell welding, plug-in unit crimping, finished product aging and testing, marking, packaging and the like.

The utility model can solve the problem of accurate measurement of hydraulic pressure of a scissor fork truck (scissor fork type lifting working platform) and a high-altitude vehicle, has double-path redundant output, can check whether a sensor works normally at any time, has unique damping design, can enable a product to have overload impact resistance, has good stability and reliability due to integrated design, has no leakage hidden trouble, and can be widely applied to industries such as the scissor fork truck and the high-altitude vehicle.

The range of the utility model is 0-250bar, the power supply voltage is 9-32VDC (the first needle of the M12 connector is positive, the 3 rd needle is negative), the current of the first output end 5 (the 4 th needle of the M12 connector) is 4-20mA, the current of the second output end 4 (the second needle of the M12 connector) is 20-4mA, the measurement accuracy is plus or minus 0.5%, and the protection grade is IP 67.

The working principle is as follows:

when hydraulic oil medium enters from the medium hole 110 and reaches the diaphragm 109, the diaphragm 109 is slightly deformed, and the silicon strain gauge senses the deformation and generates different resistance changes, so that corresponding voltage is output.

The double-path redundant output of the utility model can know whether the work of the sensor is normal or not and whether the pressure measurement is normal or not at the terminal, can give an alarm in time when a fault occurs, and improves the safety of high-altitude operation.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (9)

1. A dual-path redundant output pressure sensor is characterized in that: comprises a shell (2), a pressure port (1) fixed at one end of the shell (2), and an adapter (3) fixed at the other end of the shell (2);

a diaphragm (109) is arranged at one end of the pressure port (1), a silicon strain gauge is arranged on the outer surface of the diaphragm (109), and the diaphragm (109) and the silicon strain gauge are arranged inside the shell (2); the pressure port (1) is provided with a medium hole (110) along the axis, and the inner end of the medium hole (110) is communicated into the diaphragm (109);

a circuit board is installed in the shell (2), the circuit board is electrically connected with 2 connectors, the outer end parts of the 2 connectors are located in the adapter (3), and the 2 connectors are used as a first output end and a second output end; the silicon strain gauge is electrically connected to the circuit board.

2. A dual redundant output pressure sensor according to claim 1, wherein: the pressure port (1) further comprises a connecting bolt (101), one side of the connecting bolt (101) is provided with an outer connecting portion (102), the other side of the connecting bolt is provided with an inner connecting portion (106), the outer connecting portion (102) is fixed with a threaded head (105), the threaded head (105) is connected with high-altitude equipment, and the inner connecting portion (106) is connected with the diaphragm (109).

3. A dual redundant output pressure sensor according to claim 2, wherein: an outer connecting section (104) is arranged on the outer wall of the outer connecting part (102), and the thread head (105) is fixed on the outer connecting section (104); an annular groove (103) is formed in the outer wall surface of the outer connecting portion (102), and a sealing ring is arranged in the groove (103).

4. A dual redundant output pressure sensor according to claim 3, wherein: the outer wall of interior connecting portion (106) is provided with interior embedding portion (107), the size of interior embedding portion (107) is less than the size of interior connecting portion (106), interior embedding portion (107) with be formed with interior step face (111) between interior connecting portion (106), interior embedding portion (107) stretch into in shell (2), the port wall butt of shell (2) is in on interior step face (111).

5. A dual redundant output pressure sensor according to claim 4, wherein: an inner connecting section (108) is fixed on the outer wall of the inner embedding part (107), and the diaphragm (109) is fixed on the inner connecting section (108).

6. A dual redundant output pressure sensor according to claim 5, wherein: the adapter (3) comprises a fixing part (302) and a connecting part (301), a ring groove (303) is formed in the circumference of the outer wall of the fixing part (302), one end of the shell (2) abuts against the inside of the ring groove (303), and an external thread is arranged on the outer wall of the connecting part (301); the shaft holes are formed in the shaft cores of the fixing part (302) and the connecting part (301), and two concave holes (304) are formed in the inner wall of each shaft hole.

7. A dual redundant output pressure sensor according to claim 6, wherein: and the circuit board is also electrically connected with a power supply anode and a power supply cathode, and the power supply anode and the power supply cathode are both arranged in the shaft hole of the adapter (3).

8. A dual redundant output pressure sensor according to claim 7, wherein: and a damper is embedded in the outer end part of the medium hole (110).

9. A dual redundant output pressure sensor according to claim 8, wherein: an ED gasket is arranged at the outer end of the thread head (105).

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