CN112345157A - High-overload-resistant pressure sensor - Google Patents
High-overload-resistant pressure sensor Download PDFInfo
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- CN112345157A CN112345157A CN202011232058.0A CN202011232058A CN112345157A CN 112345157 A CN112345157 A CN 112345157A CN 202011232058 A CN202011232058 A CN 202011232058A CN 112345157 A CN112345157 A CN 112345157A
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- pressure
- flow channel
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- pressure sensor
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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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Abstract
The invention discloses a high-overload-resistant pressure sensor which comprises a base and a core body, wherein one end of the base is provided with an inner cavity for mounting the core body, the core body is positioned in the inner cavity, the other end of the core body is provided with a pressure leading hole communicated with the inner cavity, a pressure buffering structure matched with the pressure leading hole in shape is arranged in the pressure leading hole, a flow channel for buffering pressure is arranged on the pressure buffering structure, and two ends of the flow channel are respectively communicated with the pressure leading hole and the inner cavity. The invention has the advantages of simple structure, small volume, simple and convenient disassembly and assembly, high reliability, good repeatability, strong high overload resistance, modular design and the like.
Description
Technical Field
The invention mainly relates to the technical field of pressure sensors, in particular to a high-overload-resistant pressure sensor.
Background
The pressure sensor is mainly used for pressure detection in various fields, and in some application occasions, pressure media (such as gas or liquid) have the characteristic of transient overload, and the overload pressure value can reach more than several times of a rated pressure detection value sometimes. To avoid damage to the pressure sensor when the overload capacity limit of the pressure sensor is exceeded, it is common to add an orifice at the pressure sensor pilot hole. As shown in fig. 1, the main components of the pressure sensor include a first base 1, an orifice screw 2, and a first core 3. When mounting, an orifice screw 2 is mounted in a drain hole of a first base 1 of the pressure sensor, and the pressure medium passes through an orifice of the orifice screw 2 to reach a pressure sensing portion of a first core 3. The orifice depth of the orifice screw 2 is generally not more than 80% of the depth of the pilot pressure hole of the first base 1, the aperture of the orifice cannot reach the proper diameter calculated theoretically due to the limitation of processing technology and cost, and the aperture is too small, so that the transient overload resistance is poor, and the risk of blocking the pilot pressure hole is increased.
In addition, the pressure sensor adopts multiple rated pressure detection measuring ranges. This also results in a decrease in sensitivity of the detection output and a deterioration in measurement accuracy. The part still adopts spring pressure buffer's pressure sensor structure, cushions the pressure pulse in the hydraulic pressure pipeline, because the restriction of spring elastic characteristic and spring geometric dimensions, the buffer pressure scope is limited, and is limited to the buffering effect that high multiple journey transient pressure transships, and the structure is complicated, the volume is great (can't compatible little volume pressure sensor). The durability of the elastic element is not enough, elastic fatigue and the like are easy to appear after the sensor is used, and the buffer stability of the sensor in long-term operation is not good due to the accumulated abrasion of moving parts.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the high-overload-resistant pressure sensor which is simple in structure, small in size, simple and convenient to assemble and disassemble, high in reliability and good in repeatability.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides an anti high overloaded pressure sensor, includes base and core, the one end of base is equipped with the inner chamber of installation core, the core is located the inner chamber, the other end of core be equipped with the inner chamber is linked together draw the pressure hole, draw the pressure downthehole be equipped with draw pressure hole shape assorted pressure buffer structure, be equipped with the runner that is used for buffer pressure on the pressure buffer structure, the both ends of runner are linked together with drawing pressure hole and inner chamber respectively.
As a further improvement of the above technical solution:
the pressure buffering structure comprises a pressure buffering column and a fixing piece, and the fixing piece is connected with the pressure guiding hole so as to fix the pressure buffering column in the pressure guiding hole; the flow channel is positioned on the pressure buffer column, and the fixing piece is provided with a pore channel for communicating the flow channel with the pressure guide hole.
The flow channel comprises a first flow channel, a second flow channel and a third flow channel which are sequentially communicated; the second flow passage is arranged on the outer peripheral side of the pressure buffer column; the first flow channel is positioned in the pressure buffer column, one end of the first flow channel is communicated with the pressure guiding hole, and the other end of the first flow channel is communicated with one end of the second flow channel; the third flow channel is positioned in the pressure buffer column, one end of the third flow channel is communicated with the other end of the second flow channel, and the other end of the third flow channel is communicated with the inner cavity.
The first flow channel and the third flow channel are both linear.
The second flow channel is S-shaped or spiral.
And one end of the fixing piece, which is contacted with the pressure buffer column, is provided with a pressure guide cavity for communicating the pore passage with the first flow passage.
The fixing piece is a fixing screw and is in threaded connection with the pressure guide hole.
The pressure buffering column and the fixing piece are of an integrated structure.
Compared with the prior art, the invention has the advantages that:
based on the corresponding fluid mechanics principle (the longer the flow channel is, the stronger the pressure inhibition capacity is), the flow channel with proper length is adopted to buffer the overload pressure, and particularly, a pressure buffer structure is additionally arranged in the pressure leading hole, and the flow channel meeting the length requirement is additionally arranged on the pressure buffer structure, so that the transient overload pressure is inhibited, and the core body is protected from being damaged; the pressure buffering structure is simple in overall structure and small in size, the pressure buffering structure cannot be damaged by transient overload pressure, the reliability is high, the repeatability is good, and the theoretical transient overload pressure resistance cannot be changed.
The pressure buffering structure comprises the pressure buffering column and the fixing piece, wherein the fixing piece is connected with the pressure guiding hole so as to fix the pressure buffering column in the pressure guiding hole, and the pressure buffering column is simple and convenient to assemble and disassemble; or the pressure buffer column and the fixing piece can also be of an integrated structure; the whole pressure buffering structure can be replaced as an independently designed component, and the dynamic response performance of the sensor with different overload pressure requirements is improved.
The S-shaped flow channel is arranged on the outer peripheral side of the pressure buffering column, and the length of the flow channel is prolonged as far as possible under the condition that the length of the pressure buffering column is fixed, so that the overload resistance is higher; the length of the pressure buffer column can be relatively reduced to the greatest extent, so that the pressure buffer structure can be suitable for small-volume pressure leading holes.
According to the invention, the dynamic performance of the pressure sensor aiming at the transient high overload can be adjusted by adjusting design parameters such as the length of the pressure buffer column, the number and the geometric dimension of the S-shaped flow channels on the surface and the like. Of course, in other embodiments, the second flow channel may have other shapes such as a spiral shape.
Drawings
Fig. 1 is a cross-sectional view of a prior art pressure sensor.
Fig. 2 is a cross-sectional view of an embodiment of the pressure sensor of the present invention.
Fig. 3 is a sectional view of an embodiment of the pressure buffer column according to the present invention.
Fig. 4 is a perspective view of an embodiment of the pressure buffer column of the present invention.
The reference numbers in the figures denote: 1. a first base; 2. an orifice screw; 3. a first core; 4. a base; 5. a core body; 6. an inner cavity; 7. a pressure guide hole; 8. a pressure buffer structure; 81. a pressure buffer column; 811. a first flow passage; 812. a second flow passage; 813. a third flow path; 82. a fixing member; 821. a duct; 822. a pressure-inducing cavity.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 2, the high overload resistant pressure sensor of this embodiment includes a base 4 and a core 5, an inner cavity 6 for installing the core 5 is provided at one end of the base 4, the core 5 is located in the inner cavity 6, a pressure guiding hole 7 communicated with the inner cavity 6 is provided at the other end of the core 5, a pressure buffering structure 8 matched with the pressure guiding hole 7 in shape is provided in the pressure guiding hole 7, a flow channel for buffering pressure is provided on the pressure buffering structure 8, and two ends of the flow channel are respectively communicated with the pressure guiding hole 7 and the inner cavity 6. In the case of a high transient overload of a pressure medium (such as a liquid medium or a gas medium), the flow channel of the pressure buffering structure 8 has a suppression capability on the transient overload pressure, so as to protect the core 5 from being damaged.
According to the fluid mechanics principle, under the same diameter of the flow channel, the inhibition capability of transient overload pressure of the fluid medium when the fluid medium passes through the flow channel can be enhanced by increasing the length of the flow channel. Based on the principle, the pressure buffering structure 8 is additionally arranged in the pressure leading hole 7, and the flow channel meeting the length requirement is additionally arranged on the pressure buffering structure 8, so that the suppression of transient overload pressure is realized, and the core body 5 is protected from being damaged; the whole structure is simple, the volume is small, and the pressure sensor is suitable for a miniature pressure sensor; the pressure buffering structure 8 (i.e. the flow channel on the column) is not damaged by transient overload pressure, the reliability is high, the capability of theoretically resisting the transient overload pressure cannot be changed, and the repeated stability is good.
Specifically, the pressure buffering structure 8 includes a pressure buffering column 81 and a fixing member 82, the fixing member 82 is connected to the pressure guiding hole 7 to fix the pressure buffering column 81 in the pressure guiding hole 7, as shown in fig. 2, the fixing member 82 is a fixing screw, and is screwed to the pressure guiding hole 7 to clamp the pressure buffering column 81 in the pressure guiding hole 7, so that the pressure buffering column is easy to assemble and disassemble. The pressure buffer column 81 and the fixing member 82 may be integrally formed. The shape of the pressure buffer column 81 is matched with the pressure guiding hole 7, and the pressure guiding hole 7 in the conventional structure is a round hole, so that the pressure buffer column 81 is columnar. The flow channel is located on the pressure buffer column 81, a pore channel 821 for communicating the flow channel with the pressure guiding hole 7 is arranged on the fixing screw, and the size of the pore channel 821 is set according to actual requirements; in some cases, this bore 821 may also be provided as an orifice to further provide overload resistance. The pressure buffering structure 8 can be replaced as an independently designed component, the dynamic response performance of the sensor with different overload pressure requirements is improved, and the pressure buffering structure is simple and convenient to disassemble and assemble.
As shown in fig. 3 and 4, in the present embodiment, the flow passages include a first flow passage 811, a second flow passage 812, and a third flow passage 813, which are sequentially communicated; the second flow passage 812 is arranged on the outer peripheral side of the pressure buffer column 81; the first flow channel 811 is located inside the pressure buffer column 81, and one end of the first flow channel is communicated with the pressure guide hole 7, and the other end of the first flow channel is communicated with one end of the second flow channel 812; the third flow passage 813 is located inside the pressure buffering column 81, and has one end connected to the other end of the second flow passage 812 and the other end connected to the inner cavity 6. The first flow passage 811 and the third flow passage 813 are both linear; the second flow channel 812 is S-shaped, which can ensure a longer distance between the flow channels, thereby achieving better overload pressure resistance, and the S-shaped flow channel is also convenient to process.
The S-shaped flow channel is arranged on the outer peripheral side of the pressure buffering column 81, and the length of the flow channel is prolonged under the condition that the length of the pressure buffering column 81 is fixed as far as possible, so that the overload resistance is higher; the length of the pressure buffer column 81 can be relatively minimized, so that the pressure buffer structure 8 can be suitably used in the small-volume pressure guide hole 7. In other embodiments, the second flow channel 812 may have other shapes such as a spiral. Of course, the size of the flow channel is selected according to actual conditions, and the smaller the size, the better the size is when the blockage is not caused, so that the volume can be reduced as much as possible.
According to the invention, the dynamic performance of the pressure sensor aiming at the transient high overload can be adjusted by adjusting design parameters such as the length of the pressure buffer column 81, the number and the geometric dimension of the S-shaped flow channels on the surface.
In this embodiment, one end of the fixing screw contacting the pressure buffering column 81 is provided with a pressure guiding chamber 822 communicating the duct 821 and the first flow channel 811 for guiding the pressure to the inlet of the first flow channel 811 of the pressure buffering column 81 through the duct 821.
When the pressure sensor works normally, pressure medium enters the hole channel 821 of the fixing screw through the pressure guide hole 7, is guided to the first flow channel 811 through the pressure guide cavity 822, sequentially passes through the second flow channel 812 and the third flow channel 813, and then flows into the inner cavity 6 to reach the pressure sensing part of the core body 5. In the event of a high transient overload (e.g., a transient overload pressure range of 2 times the range of 10 ms), the overload pressure is suppressed in the flow path formed by the first flow path 811, the second flow path 812 and the third flow path 813, so that the pressure reaching the core 5 is within the rated pressure range of the core 5, ensuring that it is not damaged.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (8)
1. The utility model provides an anti high overloaded pressure sensor, includes base (4) and core (5), the one end of base (4) is equipped with inner chamber (6) of installation core (5), core (5) are located in inner chamber (6), the other end of core (5) be equipped with draw pressure hole (7) that inner chamber (6) are linked together, its characterized in that, draw be equipped with in pressure hole (7) with draw pressure hole (7) shape assorted pressure buffer structure (8), be equipped with the runner that is used for buffer pressure on pressure buffer structure (8), the both ends of runner are linked together with drawing pressure hole (7) and inner chamber (6) respectively.
2. The pressure sensor of claim 1, wherein the pressure buffer structure (8) comprises a pressure buffer column (81) and a fixing member (82), the fixing member (82) is connected with the pressure guiding hole (7) to fix the pressure buffer column (81) in the pressure guiding hole (7); the flow channel is positioned on the pressure buffer column (81), and the fixing piece (82) is provided with a pore passage (821) for communicating the flow channel with the pressure guide hole (7).
3. The pressure sensor of claim 2, wherein the flow channel comprises a first flow channel (811), a second flow channel (812) and a third flow channel (813) which are communicated in sequence; the second flow channel (812) is arranged on the outer peripheral side of the pressure buffer column (81); the first flow channel (811) is positioned inside the pressure buffer column (81), one end of the first flow channel is communicated with the pressure guide hole (7), and the other end of the first flow channel is communicated with one end of the second flow channel (812); the third flow channel (813) is positioned in the pressure buffer column (81), one end of the third flow channel is communicated with the other end of the second flow channel (812), and the other end of the third flow channel is communicated with the inner cavity (6).
4. A pressure sensor against high overloads according to claim 3, characterized in that the first flow channel (811) and the third flow channel (813) are both linear.
5. The pressure sensor of claim 3 or 4, wherein the second flow channel (812) is S-shaped or spiral-shaped.
6. The pressure sensor of claim 3 or 4, wherein a pressure guide cavity (822) is arranged at one end of the fixing member (82) contacting with the pressure buffer column (81) and is used for communicating the duct (821) with the first flow channel (811).
7. A pressure sensor against high overloads according to claim 3 or 4, characterized in that the fixing member (82) is a fixing screw, which is screwed with the pressure guiding hole (7).
8. A pressure sensor against high overloads according to claim 3 or 4, characterized in that the pressure damping columns (81) and the fixing members (82) are of a one-piece construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011232058.0A CN112345157A (en) | 2020-11-06 | 2020-11-06 | High-overload-resistant pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011232058.0A CN112345157A (en) | 2020-11-06 | 2020-11-06 | High-overload-resistant pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112345157A true CN112345157A (en) | 2021-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011232058.0A Pending CN112345157A (en) | 2020-11-06 | 2020-11-06 | High-overload-resistant pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112345157A (en) |
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2020
- 2020-11-06 CN CN202011232058.0A patent/CN112345157A/en active Pending
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