CN110595665A - Pressure detection sensor and detection method - Google Patents
Pressure detection sensor and detection method Download PDFInfo
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- CN110595665A CN110595665A CN201910848524.9A CN201910848524A CN110595665A CN 110595665 A CN110595665 A CN 110595665A CN 201910848524 A CN201910848524 A CN 201910848524A CN 110595665 A CN110595665 A CN 110595665A
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- 238000001514 detection method Methods 0.000 title claims abstract description 143
- 238000007789 sealing Methods 0.000 claims abstract description 59
- 239000010985 leather Substances 0.000 claims abstract description 54
- 230000008859 change Effects 0.000 claims abstract description 27
- 230000006698 induction Effects 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 230000005489 elastic deformation Effects 0.000 claims description 4
- 230000005415 magnetization Effects 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 11
- 239000007788 liquid Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 239000013013 elastic material Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0618—Overload protection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/16—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in the magnetic properties of material resulting from the application of stress
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a pressure detection sensor and a detection method, wherein a detection cavity in a shell is separated into a first detection cavity and a second detection cavity by a sealing leather cup, wherein the first detection cavity and the second detection cavity are not communicated with each other; the sealing leather cup deforms based on the pressure difference between the first detection cavity and the second detection cavity; the elastic moving assembly arranged in the first detection cavity or/and the second detection cavity is matched with the sealing leather cup, and when the sealing leather cup deforms, the deformed sealing leather cup drives the sealing leather cup to move in the corresponding detection cavity; the magnetic field element is matched with the elastic moving assembly and changes the magnetic field in the corresponding detection cavity under the driving of the elastic moving assembly during moving; the induction element detects the change of the magnetic field in the first detection cavity or/and the second detection cavity. The scheme is integrally of a corresponding mechanical structure, compact and simple in structure, low in cost, high in reliability, capable of resisting various impact pressures and suitable for various severe and complex application environments.
Description
Technical Field
The invention relates to a sensor technology, in particular to a pressure detection sensor technology.
Background
In the existing pressure detection sensing technology, the detection of gas and liquid pressure is mainly detected by using a MEMS sensor.
The MEMS pressure sensor has high response speed, but the development period is long, the process difficulty is high, the cost is high, the product series is few, and a user cannot easily select a proper product even though the cost is high. In particular, in order to maintain the detection accuracy of the MEMS sensor, some critical portions need to use a high-hardness adhesive, which is brittle and is easily damaged by the shock wave of the liquid when the pressure of the liquid is detected.
Therefore, the problem to be solved in the art is to provide a pressure sensor which is suitable for various complex detection environments, simple in structure, and stable and reliable in performance.
Disclosure of Invention
In order to solve the problems of the existing pressure detection sensing technology, a pressure detection sensing scheme with simple structure and stable and reliable performance is needed.
Therefore, the invention aims to provide a pressure detection sensor which has compact and simple structure and high reliability, can be suitable for various complex detection environments, and can effectively overcome the problems in the prior art; accordingly, the invention further provides a pressure detection method to realize reliable pressure detection.
In order to achieve the above object, the present invention provides a pressure sensor, which comprises a housing, a sealing cup, at least one elastic moving component, at least one sensing element and at least one magnetic field element;
a corresponding detection cavity is formed in the shell;
the sealing leather cup is arranged in the detection cavity of the shell in a sealing manner, and the detection cavity in the shell is separated into a first detection cavity and a second detection cavity which are not communicated with each other; the sealing leather cup can deform based on the pressure difference between the first detection cavity and the second detection cavity;
the elastic moving assembly is arranged in the first detection cavity or/and the second detection cavity and matched with the sealing leather cup, and can be driven by the deformed sealing leather cup to move in the corresponding detection cavity when the sealing leather cup deforms;
the magnetic field element forms a magnetic field in the first detection cavity or/and the second detection cavity, the magnetic field element is matched with the elastic moving assembly in the detection cavity, and the magnetic field in the corresponding detection cavity is changed under the driving of the elastic moving assembly during moving;
the induction element detects the change of the magnetic field in the first detection cavity or/and the second detection cavity.
Further, the housing comprises a first housing and a second housing, a first detection cavity is formed in the first housing, a second detection cavity is formed in the second housing, and the first housing and the second housing are connected and combined to form the housing, so that the first detection cavity in the first housing corresponds to the second detection cavity in the second housing; the sealing leather cup is arranged between the first shell and the second shell and separates a first detection cavity in the first shell and a second detection cavity in the second shell.
Further, the elastic movement assembly comprises an ejector rod and a spring, the ejector rod is arranged in the corresponding detection cavity of the shell through the spring, the top end of the ejector rod is matched with the sealing leather cup, can be driven when deformed by the sealing leather cup and moves along the deformation direction of the sealing leather cup, and the ejector rod drives the spring to deform in the moving process.
Further, the magnetic field element is a magnet.
Further, the magnet is arranged on the elastic moving component.
Further, the magnetization direction of the magnet is consistent with the moving direction of the elastic moving component.
Furthermore, the moving distance of the magnet along with the elastic moving component is less than or equal to the length of the magnet.
Furthermore, a corresponding thrust stop position is arranged in the shell to be matched with the elastic moving component.
Further, the inductive element is mounted at an outer side or end of the magnetic field element.
Further, when the inductor is arranged on the outer side of the magnetic field element, the distance between the surface of the induction element and the surface of the magnetic field element is 0.5-8 mm; when the inductor is arranged at the outer end of the magnetic field element, the distance between the surface of the induction element and the surface of the magnetic field element is 1.5-9 mm.
In order to achieve the above object, the present invention provides a pressure detecting method, including:
sensing the pressure by the elastic deformation element and converting the pressure difference into corresponding mechanical displacement;
the mechanical displacement drives the induction magnetic field to change;
the change of the magnetic field is detected, and the pressure or the pressure difference is calculated according to the change of the magnetic field.
The pressure detection sensor scheme provided by the invention has the advantages of compact and simple structure, low cost, high reliability, capability of resisting various impact pressures and suitability for various severe and complicated application environments, and the whole structure is a corresponding mechanical structure.
Moreover, when the pressure detection sensor scheme provided by the invention is applied, the detection range can be changed through simple spring stiffness adjustment, the application range is wide, and the market prospect is good.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
Fig. 1 is an exploded view of a pressure detecting sensor provided in example 1 of the present invention;
FIG. 2 is a cross-sectional view of a pressure sensor body provided in example 1 of the present invention;
FIG. 3 is a schematic structural view of a packing cup according to example 1 of the present invention;
FIG. 4 is a schematic view showing the magnetic field distribution of a magnet in example 1 of the present invention;
FIG. 5 is a schematic view of an overvoltage protection structure in example 1 of the present invention;
FIG. 6 is a schematic diagram of the pressure-free zone scheme provided in example 2 of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
In order to avoid various defects of the existing MEMS scheme, the scheme of the invention innovatively adopts an elastic deformation element to sense pressure and convert the pressure difference into corresponding mechanical displacement; then the mechanical displacement drives the induction magnetic field to change; and finally, detecting the change of the magnetic field, and calculating the pressure or the pressure difference according to the change of the magnetic field so as to realize the detection of the pressure.
Therefore, the scheme of the invention mainly comprises a shell, a sealing leather cup, at least one elastic moving component, at least one induction element and at least one magnetic field element which are matched with each other.
Wherein, a corresponding detection cavity is formed in the shell; the sealing leather cup is arranged in the detection cavity of the shell in a sealing manner, and the detection cavity in the shell is separated into a first detection cavity and a second detection cavity which are not communicated with each other; meanwhile, the sealing leather cup can deform based on the pressure difference between the first detection cavity and the second detection cavity.
With it complex, this scheme is provided with the elastic movement subassembly in first detection cavity or second detection cavity, and this elastic movement subassembly and the cooperation of sealed leather cup can be when sealed leather cup takes place to deform, and the direction that takes place to deform along sealed leather cup in corresponding detection cavity by the sealed leather cup drive of deformation removes, then converts pressure differential or pressure into corresponding mechanical displacement.
Furthermore, the magnetic field element forms a corresponding magnetic field in the first detection cavity or/and the second detection cavity, and the magnetic field element is matched with the elastic moving assembly in the detection cavity, so that the magnetic field in the corresponding detection cavity can be changed under the driving of the elastic moving assembly during moving;
furthermore, the scheme detects the change of the magnetic field in the first detection cavity or/and the second detection cavity through the induction element.
According to the scheme, the sealing leather cup is matched with the elastic moving component, so that the pressure difference or pressure is skillfully converted into corresponding mechanical displacement; on the basis of the characteristics of magnetic field change and induction, the characteristics of magnetic field space distribution are utilized, and the change of the space magnetic field is detected through the induction element, so that the pressure detection is realized.
When the scheme is applied specifically, high-pressure fluid can be connected into an independent cavity (namely a first detection cavity or/and a second detection cavity) which is formed by separating a sealing leather cup in a shell, if low-pressure liquid is connected into the first detection cavity, because the elastic moving assembly in the first detection cavity is matched with the sealing leather cup, the sealing leather cup can deform towards the first detection cavity under the reuse of pressure difference, and then the elastic moving assembly in the first detection cavity is driven to move in the first detection cavity and generate corresponding elastic deformation, so that the conversion from pressure to mechanical movement is realized. At this time, when the elastic moving assembly moves in the first detection cavity, the elastic moving assembly drives or drives the corresponding magnetic field element in the first detection cavity to act, and then the magnetic field generated by the magnetic field element in the first detection cavity is changed. Therefore, according to the characteristics of the magnetic field spatial distribution of the magnetic field element in the first detection cavity, the change of the spatial magnetic field in the first detection cavity is detected by the induction element, so that the pressure difference of two liquids is detected.
For the above scheme, the implementation process of the scheme is further described below by specific examples.
In the case of example 1, the following examples,
referring to fig. 1 and 2, there are shown constituent examples of a pressure detecting sensor formed based on the above-described principle.
As can be seen from the figure, the pressure detection sensor mainly comprises nine parts, namely an upper shell (1), a sealing leather cup (2), a mandril (3), a magnet (4), an inductor (5), a wire harness (6), a spring (7), a lower shell (8) and an end cover (9).
The upper shell (1) and the lower shell (8) are connected and matched to form a shell component of the whole pressure detection sensor. The upper shell (1) is used as a first shell of the pressure detection sensor, and a first detection cavity A is formed in the upper shell; and the lower shell (8) is used as a second shell of the pressure detection sensor, and a second detection cavity B is formed in the lower shell. Meanwhile, the upper shell (1) and the lower shell (8) are connected and combined through a clamping structure, and a first detection cavity A on the upper shell (1) and a second detection cavity B on the lower shell (8) are arranged correspondingly to each other (as shown in fig. 2).
It should be noted that, in this embodiment, the specific structural form and the structural scheme of the upper shell (1) and the lower shell (8) may be determined according to actual requirements, for example, the structural scheme shown in fig. 1 and fig. 2 may be adopted, and other structural schemes may also be adopted, which is not limited herein. As long as it can ensure stable and reliable structure and is convenient for practical application.
The specific structural form and the structural scheme of the clamping structure for connecting and combining the upper shell (1) and the lower shell (8) can be determined according to actual requirements, and if the structural scheme shown in fig. 1 and fig. 2 can be adopted, other structural schemes can also be adopted, and the structure is not limited herein. As long as it can ensure stable and reliable structure and is convenient for practical application.
On the basis, a sealing leather cup (2) is further arranged at the joint between the upper shell (1) and the lower shell (8), when the upper shell (1) and the lower shell (8) are connected and combined, the sealing leather cup (2) is just pressed to form a sealing structure, and meanwhile, the connecting end part of the upper shell (1) and the connecting end part of the lower shell (8) are sealed, so that a first detection cavity A on the upper shell (1) and a second detection cavity B on the lower shell (8) are respectively sealed and isolated, and two independent cavities, namely a high-pressure cavity A and a low-pressure cavity B, which are not communicated with each other are respectively formed in the upper shell (1) and the lower shell (8); meanwhile, two side surfaces of the sealing leather cup (2) are respectively and directly positioned in the high-pressure cavity A and the low-pressure cavity B, and the pressure in the high-pressure cavity A and the pressure in the low-pressure cavity B are directly sensed.
Referring to fig. 3, a view showing a constitution example of the seal cup (2) in this example is shown. This whole structural style of sealed leather cup (2) has the bowl form along the limit, and the convex part sets up to the high pressure chamber A in face-to-face shell (1).
In order to ensure the sealing effect, the sealing leather cup (2) is made of elastic materials or composite materials of the elastic materials and other materials.
By way of example, the sealing cup (2) is made of corresponding elastic rubber, and 2 groups of sealing ribs 201, 202, 203 and 204 are symmetrically arranged on two side faces along the edge, so that leakage of the cavity A, B is effectively prevented. The sealing ribs 201, 202, 203 and 204 are distributed on two side surfaces along the edge along the circumferential direction to form corresponding convex ring shapes.
After the sealing ribs on the edge of the sealing leather cup (2) are assembled on the upper shell and the lower shell, the compression rate of the sealing ribs is 10% -90%, preferably 30% -70%, such as 30%, 40%, 50%, 60% and 70%, so that the sealing effect is ensured.
The sealing leather cup (2) arranged from this can sense the pressure change in the high pressure cavity A and the low pressure cavity B which are positioned at the two sides of the sealing leather cup, and can deform correspondingly according to the pressure change, namely, the sealing leather cup is driven to deform by pressure difference.
On the basis, the elastic moving assembly composed of the ejector rod (3) and the spring (7) is further arranged in the low-pressure cavity B of the lower shell (8) and used for being matched with the sealing leather cup (2) to sense the deformation of the sealing leather cup (2), and the elastic moving assembly moves in the low-pressure cavity B of the lower shell (8) under the driving of the deformation of the sealing leather cup (2), so that the pressure is converted into mechanical movement.
Specifically, the top of this ejector pin (3) is provided with corresponding end cap, and the structure and the sealed leather cup (2) of this end cap cooperate, and spring (7) cover is established on ejector pin (3) simultaneously, and the end cap butt on its one end and ejector pin (3), the other end carries out the butt with inferior valve (8) low pressure intracavity B interior step, constitutes from this and seals leather cup (2) complex elastic movement subassembly.
In the elasticity removal subassembly that from this sets up, spring (7) will make the top of ejector pin (3) be the end cap promptly and seal leather cup (2) cooperation when normal condition, and the drive of the pressure differential that forms between high-pressure chamber A and low pressure chamber B when seal leather cup (2) like this will take place to face low-pressure chamber B's deformation, drives ejector pin (3) removal then, and ejector pin (3) will compress spring (7) at the removal in-process, realize the conversion from pressure to ejector pin (3) displacement based on Newton's third law.
Preferably, when the elastic moving assembly is arranged in the low-pressure cavity B and the spring on the elastic moving assembly is in a free length, the gap between the mandril and the sealing leather cup is preferably in a range of 0 +/-0.5 mm so as to ensure the detection precision.
In this example, a magnet (4) is used as a magnetic field element to form a corresponding magnetic field in the low-pressure chamber B. In order to enable the magnetic field formed by the magnet (4) in the low-pressure cavity B to change along with the movement of the ejector rod (3), the magnet (4) is preferably embedded on the ejector rod (3) and moves synchronously along with the movement of the ejector rod (3) in the embodiment. Simultaneously, the magnetization direction of this magnet (4) is unanimous (as shown in fig. 4) with the axial direction of ejector pin (3), so set up and to make when magnet removes along the magnetization direction, corresponding space magnetic field is the law and changes, is convenient for follow-up based on space magnetic field transform detects magnet displacement distance.
Furthermore, in the pressure sensor, the moving distance of the magnet is less than or equal to the length of the magnet within the pressure detection range, so that the space magnetic field change generated by the magnet is close to linear change, the subsequent convenient calculation of the displacement distance directly from the magnetic field change is further facilitated, the cost is reduced, and the submission efficiency is improved.
In the magnetic field formed by the magnet (4), the sensor (5) is adopted to detect the change of the magnetic field, and the induction signal is transmitted through the wire harness (6).
Preferably, the present example employs a linear hall element as the inductor (5) (i.e., the sensing element).
The linear hall element is preferably mounted on the outside or outer end of the magnet (4) and does not move in position with changes in the pressure of the sensing fluid. The outer side here refers to the side parallel to the direction of movement, while the outer end refers to the outside of the chamber perpendicular to the direction of movement.
The inventors have determined through a great deal of experiments that when the inductor is installed outside the magnet, the distance between the surface of the inductor and the surface of the magnet is preferably 0.5mm to 8 mm. If the distance is too close, the linear relation of the magnetic field strength part is poor, the magnetic field strength of the part with good linearity is weak, the detection difficulty is higher, and the performance of the sensor is influenced; if the distance is too far, the magnetic field intensity is weak, the detection difficulty is increased, and the performance of the sensor is influenced.
Similarly, when the inductor is mounted at the outer end of the magnet, the distance between the surface of the inductor and the surface of the magnet is preferably 1.5mm to 9 mm. Through a large number of experiments, it is determined that when the distance is too close, the magnetic field intensity change gradient is large, the detection range of a corresponding detection element required is large enough, the cost is greatly increased, and the magnetic field only changes linearly in a small displacement range, so that the product precision is improved, and the performance of the sensor is affected; when the distance is too far, the magnetic field intensity is weak, the detection difficulty is large, and the performance of the sensor is influenced.
Aiming at the elastic moving assembly arranged in the low-pressure cavity B of the lower shell (8), the end cover (9) is arranged at the tail end of the lower shell (8) for protecting the inductor (5) fixed on the lower shell (8), and the wire harness (6) leads out an inductor signal. The specific configuration of the end cap (9) can be determined according to actual requirements, and is not limited herein.
On the basis of the scheme, the embodiment further provides a corresponding thrust position (801) on the lower shell (8), and the thrust position (801) is used for being matched with the ejector rod (3) to limit the moving stroke of the ejector rod (3) so as to form an overpressure protection device of the pressure detection sensor (as shown in fig. 5).
It should be noted that the specific configuration of the thrust stop can be determined according to practical requirements, and is not limited herein, as long as the strength is ensured to be sufficient to protect the product from being damaged in case of overpressure.
By way of example, the thrust location (801) in this example is located relative to the free end faces (301) and (302) of the ram (3) and is 0.5mm to 5mm, preferably 1mm, from the ram end faces (301) and (302) when the sensor is at maximum detection pressure (i.e. the cavity a is at maximum pressure).
Based on the overpressure protection device with the structure, when the fluid valve is opened, the pressure of the fluid is suddenly increased and shock waves are formed, and the distance between the thrust stop (801) and the top columns (301) and (302) enables the spring (7) to be compressed properly and continuously, so that the damage of the shock waves to the sensor is effectively buffered. When the detected pressure exceeds the measuring range of the sensor, the spring (7) is further compressed, so that the displacement of the ejector rod (3) is continuously expanded until the ejector columns (301) and (302) on the ejector rod (3) touch the thrust stop position (801), and even if the pressure of the cavity A is continuously increased, the ejector rod (3) does not move any more, the spring (7) is not further compressed, and the spring (7) is prevented from being damaged due to overpressure or the leather cup (2) is prevented from being damaged due to separation from the support.
When the pressure detection sensor works, the ejector rod (3) of the pressure detection sensor is close to the sealing leather cup (2), when the pressure in the high-pressure cavity A is greater than the pressure in the low-pressure cavity B, the sealing leather cup moves towards the low-pressure cavity rapidly under the action of the cavity pressure difference between the high-pressure cavity A and the low-pressure cavity B and extrudes the ejector rod (3), so that the ejector rod (3) compresses the spring (7), the movement amount of the ejector rod (3) is the compression amount of the spring, and the conversion from the pressure difference to the displacement is realized.
Because the magnet (4) is fixed on the ejector rod, the magnet (4) and the ejector rod move for the same distance. After the rigidity of the spring (7) is increased, the compression amount of the spring is reduced under the same pressure difference, namely the displacement of the ejector rod is reduced; that is, when the ram remains displaced the same, the pressure differential between the A, B chambers increases. Similarly, when the spring (7) stiffness is reduced, the pressure differential between the A, B chambers is reduced while the ram remains displaced the same. Namely, the detection range of the sensor can be rapidly adjusted by selecting the springs (7) with different stiffness; therefore, the detection range can be changed through simple spring stiffness adjustment, and the practicability of the pressure detection sensor is greatly improved.
With further reference to fig. 2 and 4, when the magnet is magnetized in the axial direction of the magnet, different locations in the space around the magnet have different magnetic field strengths and directions. Meanwhile, as the magnet (4) is fixed on the ejector rod, when the ejector rod of the magnet (4) moves for the same distance, the intensity and direction of the magnetic field generated in the same area correspondingly change.
In the pressure detection sensor, a linear Hall sensor is arranged on the side surface of the magnet to detect the change of a magnetic field, and the moving distance of the magnet (4) (equivalent to the ejector rod (3)) can be known by detecting the change of the magnetic field intensity, so that the pressure difference between A, B cavities can be indirectly calculated, and the detection of the pressure difference is realized.
When the pressure detection sensor is applied specifically, when the two cavities A, B are filled with fluids with different pressures, the sensor detects the pressure difference of the two cavities; when only one of the cavities is filled with fluid and the other cavity is communicated with the atmosphere, the sensor detects the pressure of the filled fluid, for example, when the low-pressure cavity B is communicated with the atmosphere and other fluids are not accessed, the pressure difference of the A, B cavity is the pressure of the fluid accessed to the cavity A, and the detection of the fluid pressure can be realized.
Example 2
Based on the scheme of example 1, this example gives a variant.
Referring to fig. 6, in this example, on the basis of the solution of example 1, a push rod (10) and a spring (11) are further added in the high pressure chamber a of the upper housing (1) to form a corresponding elastic moving assembly, and the composition of the push rod (10) and the spring (11) is the same as that of example 1, and is not described again here.
On the basis, a corresponding magnet (4) and a corresponding inductor (5) are further arranged in the high-pressure cavity A of the upper shell (1) to be matched with an elastic moving assembly formed by a push rod (10) and a spring (11), the specific forming scheme is the same as that of the example 1, and the details are not repeated.
The pressure detection sensor with the structure increases the prepressing force on the spring (7) and the spring (11) after assembly, so that the cavity A and the cavity B do not need to be distinguished from a high-pressure cavity and a low-pressure cavity when fluid is accessed. The prepressing amount of the springs (7) and (11) is not less than the displacement of the ejector rod under the maximum detection pressure.
The operation principle and process of the pressure detecting sensor in this example are the same as those in example 1, and are not described herein again.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (11)
1. The pressure detection sensor is characterized by comprising a shell, a sealing leather cup, at least one elastic moving component, at least one sensing element and at least one magnetic field element;
a corresponding detection cavity is formed in the shell;
the sealing leather cup is arranged in the detection cavity of the shell in a sealing manner, and the detection cavity in the shell is divided into a first detection cavity and a second detection cavity which are not communicated with each other; the sealing leather cup can deform based on the pressure difference between the first detection cavity and the second detection cavity;
the elastic moving assembly is arranged in the first detection cavity or/and the second detection cavity and matched with the sealing leather cup, and can be driven by the deformed sealing leather cup to move in the corresponding detection cavity when the sealing leather cup deforms;
the magnetic field element forms a magnetic field in the first detection cavity or/and the second detection cavity, the magnetic field element is matched with the elastic moving assembly in the detection cavity, and the magnetic field in the corresponding detection cavity is changed under the driving of the elastic moving assembly during moving;
the induction element detects the change of the magnetic field in the first detection cavity or/and the second detection cavity.
2. The pressure detection sensor of claim 1, wherein the housing comprises a first housing and a second housing, the first housing has a first detection cavity formed therein, the second housing has a second detection cavity formed therein, and the first housing and the second housing are connected and combined to form a housing such that the first detection cavity in the first housing and the second detection cavity in the second housing correspond to each other; the sealing leather cup is arranged between the first shell and the second shell and separates a first detection cavity in the first shell and a second detection cavity in the second shell.
3. The pressure detecting sensor according to claim 1, wherein the elastic moving assembly includes a push rod and a spring, the push rod is disposed in the corresponding detecting cavity of the housing through the spring, the top end of the push rod is engaged with the sealing cup, can be driven by the sealing cup when deformed, and moves along the deformation direction of the sealing cup, and the push rod drives the spring to deform during the moving process.
4. The pressure detection sensor of claim 1, wherein the magnetic field element is a magnet.
5. The pressure detecting sensor of claim 4, wherein the magnet is provided on the elastically movable member.
6. The pressure detecting sensor according to claim 5, wherein the magnetization direction of the magnet coincides with the moving direction of the elastic moving member.
7. The pressure detecting sensor of claim 4, wherein the magnet moves with the elastic moving member by a distance ≦ a magnet length.
8. The pressure detecting sensor of claim 1, wherein a corresponding stop is provided in the housing to engage the resiliently movable component.
9. A pressure detecting sensor according to claim 1, characterized in that the sensing element is mounted at the outer side or end of the magnetic field element.
10. The pressure detecting sensor according to claim 9, wherein when the inductor is installed outside the magnetic field element, the distance between the surface of the inductive element and the surface of the magnetic field element is 0.5mm to 8 mm; when the inductor is arranged at the outer end of the magnetic field element, the distance between the surface of the induction element and the surface of the magnetic field element is 1.5-9 mm.
11. A pressure detection method, characterized in that the detection method comprises:
sensing the pressure by the elastic deformation element and converting the pressure difference into corresponding mechanical displacement;
the mechanical displacement drives the induction magnetic field to change;
the change of the magnetic field is detected, and the pressure or the pressure difference is calculated according to the change of the magnetic field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910848524.9A CN110595665A (en) | 2019-09-09 | 2019-09-09 | Pressure detection sensor and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910848524.9A CN110595665A (en) | 2019-09-09 | 2019-09-09 | Pressure detection sensor and detection method |
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| CN114877939A (en) * | 2022-05-13 | 2022-08-09 | 浙江大元泵业股份有限公司 | Pressure flow sensor module |
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