CN212988658U

CN212988658U - Digital pressure gauge with temperature compensation function for instrument calibration

Info

Publication number: CN212988658U
Application number: CN202022175190.4U
Authority: CN
Inventors: 李金政
Original assignee: Yunnan Fangyuan Metrology Calibration Testing Service Co ltd
Current assignee: Yunnan Fangyuan Metrology Calibration Testing Service Co ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-04-16
Anticipated expiration: 2030-09-28

Abstract

The utility model provides a digital pressure gauge with temperature compensation function for instrument calibration, which comprises a housin, install the circuit board on the back shrouding of casing, install temperature compensation arrangement on the circuit board, temperature compensation arrangement includes fixing base and solid fixed cylinder, one side that the circuit board was kept away from to the fixing base is equipped with the fixed slot, the embedded two at least fixed subassemblies that are equipped with of fixing base, fixed subassembly includes a screw thread section of thick bamboo, the meshing is connected with the screw thread post on the inner wall of screw thread section of thick bamboo, coil spring and dwang are installed respectively to the both ends of screw thread post, the fixed block is installed to one side of solid fixed cylinder, just the integrated board is installed to the inboard of solid fixed cylinder, install a plurality of thermistor on the integrated board, it is a plurality of temperature compensation circuit is. The utility model realizes the rapid installation and disassembly of the temperature compensation device, and makes the subsequent maintenance more convenient; and the temperature compensation function is realized, and the measurement accuracy is improved.

Description

Digital pressure gauge with temperature compensation function for instrument calibration

Technical Field

The utility model relates to a digital pressure gauge's technical field specifically is a digital pressure gauge with temperature compensation function for instrument calibration.

Background

Among the prior art, often use digital pressure gauge to carry out the instrument calibration work, digital pressure gauge can obtain higher degree of accuracy and stability than mechanical pressure gauge, however the pressure sensor of pressure resistance formula is influenced by the temperature more easily, and produce great error, so many manufacturers who use the pressure sensor of pressure resistance formula all can use the temperature compensation circuit, when pressure sensor's temperature changes, borrow the temperature compensation circuit to come the pressure value automatic maintenance accuracy that senses to, but the temperature compensation circuit among the current digital pressure gauge adopts the mode of soldering connection to fix mostly, there is the inconvenient problem of dismantlement.

Therefore, there is a need to develop a digital pressure gauge with temperature compensation function for calibrating instruments, which solves the problem of inconvenient disassembly of the temperature compensation circuit.

SUMMERY OF THE UTILITY MODEL

The utility model mainly provides a digital pressure gauge with temperature compensation function for instrument calibration for solve the technical problem who proposes in the above-mentioned background art.

The utility model provides a technical scheme that above-mentioned technical problem adopted does:

a digital pressure gauge with temperature compensation function for instrument calibration comprises a shell, a circuit board is arranged on a rear sealing plate of the shell, the circuit board is provided with a temperature compensation device which comprises a fixed seat and a fixed cylinder, a fixed groove is arranged at the center of one side of the fixed seat far away from the circuit board, at least two fixed components are embedded in the fixed seat, each fixed component comprises a threaded cylinder, the inner wall of each threaded cylinder is connected with a threaded column in a meshed manner, two ends of each threaded column are respectively provided with a helical spring and a rotating rod, and a fixed block is arranged at the center of the plane closed end of the fixed cylinder and is matched and connected with the fixed groove, and the inner side of the fixed cylinder is provided with an integrated board, the integrated board is provided with a plurality of thermistors, and the thermistors are connected through a lead to form a temperature compensation circuit.

Furthermore, a plurality of locating grooves are evenly distributed on the outer side of the fixing groove along the circumference, and a permanent magnet seat is installed on the inner side of each locating groove.

Furthermore, a plurality of permanent magnet columns are uniformly distributed on one side of the fixed cylinder corresponding to the positioning groove along the circumference, and each permanent magnet column is mutually attracted with the permanent magnet seat.

Further, every the one end that the screw thread post was kept away from to the dwang all runs through a screw thread section of thick bamboo and the fixing base extends to the outside and installs the rocking handle, the dwang is installed with the junction of a screw thread section of thick bamboo and fixing base and is rotated the piece.

Further, a pressure sensor is arranged below the temperature compensation device.

Further, the fixing seat is fixedly connected with the circuit board through a bolt, and the fixing seat can be detached.

Furthermore, the fixed cylinder is of a cylindrical structure with one end being uncovered.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model realizes the rapid installation and disassembly of the temperature compensation device through the fixed block, the fixed groove, the rotating rod, the threaded column, the threaded cylinder and the spiral spring, so that the subsequent maintenance is more convenient; the thermistor is adopted to form a temperature compensation circuit, so that the temperature compensation function is realized, and the measurement accuracy is improved; the temperature compensation circuit is integrated in the fixed cylinder, so that the wires can be prevented from being distributed in disorder, and the subsequent maintenance work is facilitated; through the cooperation of permanent magnet post and permanent magnet seat, improved mounting structure's stability.

The present invention will be explained in detail with reference to the drawings and specific embodiments.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the internal structure of the housing of the present invention;

FIG. 3 is a sectional view of the fixing base and the fixing cylinder of the present invention;

fig. 4 is an enlarged view of a region a in fig. 2.

In the figure: 1. a housing; 11. a circuit board; 2. a temperature compensation device; 21. a fixed seat; 211. fixing grooves; 212. positioning a groove; 213. a permanent magnet base; 22. a fixed cylinder; 221. an integrated board; 23. a thermistor; 24. a fixed block; 25. a permanent magnet column; 3. a fixing assembly; 31. a threaded barrel; 32. a threaded post; 33. a coil spring; 34. rotating the rod; 35. a rocking handle; 36. a rotating member; 4. a pressure sensor.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully with reference to the accompanying drawings, in which several embodiments of the present invention are shown, but the present invention can be implemented in different forms, and is not limited to the embodiments described in the text, but rather, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the use of the term knowledge in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In an embodiment, referring to fig. 1 and 3, a digital pressure gauge with a temperature compensation function for calibrating an instrument includes a housing 1, a circuit board 11 is mounted on a rear sealing plate of the housing 1, a temperature compensation device 2 is mounted on the circuit board 11, the temperature compensation device 2 includes a fixing base 21 and a fixing cylinder 22, a fixing groove 211 is disposed at a center of a side of the fixing base 21 away from the circuit board 11, at least two fixing assemblies 3 are embedded in the fixing base 21, the fixing assemblies 3 are set according to a use requirement, when the number of the fixing assemblies 3 is 2, the two fixing assemblies 3 should be arranged oppositely, when the number of the fixing assemblies 3 is 4, the fixing assemblies 3 should be arranged oppositely, each fixing assembly 3 includes a threaded cylinder 31, a threaded column 32 is engaged and connected to an inner wall of each threaded cylinder 31, an inner thread is disposed on an inner wall of each threaded cylinder 31, the outer wall of screw thread post 32 sets up the external screw thread, internal thread and external screw thread intermeshing, every coil spring 33 and dwang 34, every are installed respectively at the both ends of screw thread post 32 the one end that screw thread post 32 was kept away from to dwang 34 all runs through a screw thread section of thick bamboo 31 and fixing base 21 and extends to the outside and install rocking handle 35, dwang 34 installs a rotation piece 36 with the junction of a screw thread section of thick bamboo 31 and fixing base 21, and the rotation of dwang 34 is convenient for through a rotation piece 36, and a rotation axle sleeve can be adopted to rotation piece 36, fixed block 24 is installed to the center department of a fixed section of thick bamboo 22 plane closed end, fixed block 24 is connected with the fixed slot 211 cooperation, rotates rocking handle 35 with the hand, makes dwang 34 drive screw thread post 32 and screw thread section of thick bamboo 31 meshing transmission through rocking handle 35, and screw thread post 32 makes reciprocating motion drive coil spring 33 and removes to suitable position, compress tightly fixed block 24 through the reverse elasticity of coil spring 33, accomplished temperature-compensated equipment 2's installation promptly, when dismantling, make dwang 34 antiport, drive coil spring 33 and keep away from fixed block 24 and can accomplish the dismantlement of temperature-compensated equipment 2, the installation is convenient with the dismantlement, convenient to use, integrated board 221 is installed to the inboard of fixed section of thick bamboo 22, install a plurality of thermistor 23 on the integrated board 221, a plurality of thermistor 23 passes through the wire and connects and form the temperature compensation circuit, pressure sensor 4 is installed to the below of temperature-compensated equipment 2, and pressure sensor 4 model is PV-5, still includes controller, operational amplifier circuit etc. except pressure sensor 4 in the digital pressure gauge, and the controller can adopt chips such as singlechip or DSP, and the model does not do the injecing, and the electrical part in the digital pressure gauge can adopt the wire to connect, if pressure sensor 4 passes through the wire and is connected with the controller, the thermistor 23 constitutes a temperature compensation circuit and is connected with an operational amplification circuit through a wire, etc. the prior art is not specifically described, the thermistor 23 constitutes a temperature compensation circuit, when the temperature of the pressure sensor 4 changes, the resistance value of the thermistor 23 in the temperature compensation circuit changes along with the change of the temperature, namely, the amplification factor of the operational amplification circuit can be changed to perform temperature compensation of an output signal, if the temperature coefficient of the pressure sensor 4 is negative, the thermistor 23 with a positive temperature coefficient is adopted, if the temperature coefficient of the pressure sensor 4 is positive, the thermistor 23 with a negative temperature coefficient is adopted, the fixed seat 21 is fixedly connected with the circuit board 11 through a bolt, the fixed seat 21 is detachable, the fixed seat 21 connected through the bolt is convenient to detach and convenient to maintain and replace, the fixed cylinder 22 is of a cylindrical structure with one uncovered end, one end of the fixed cylinder 22 is uncovered, the heat dissipation effect is good.

In an embodiment, referring to fig. 2 and 3, a plurality of positioning grooves 212 are circumferentially and uniformly distributed on an outer side of the fixing groove 211, a permanent magnet base 213 is circumferentially and uniformly installed on an inner side of each positioning groove 212, a plurality of permanent magnet columns 25 are circumferentially and uniformly distributed on a side of the fixing cylinder 22 corresponding to the positioning grooves 212, each permanent magnet column 25 is attracted to the permanent magnet base 213, and the permanent magnet columns 25 are matched with the permanent magnet base 213, so that stability of the installation structure is improved.

The utility model discloses a concrete operation as follows:

firstly, the rocking handle 35 is rotated by hand, the rotating rod 34 drives the threaded column 32 to be meshed with the threaded barrel 31 for transmission through the rocking handle 35, at the moment, the threaded column 32 reciprocates in the threaded barrel 31 to drive the spiral spring 33 to move to a proper position, the fixed block 24 can extrude the spiral spring 33 after being inserted into the fixed groove 211, the fixed block 24 is pressed through reverse elasticity of the spiral spring 33, the temperature compensation device 2 is installed, when the temperature sensor 4 is disassembled, the rotating rod 34 rotates reversely, the spiral spring 33 is driven to be far away from the fixed block 24, the temperature compensation device 2 can be disassembled, the thermistor 23 is adopted to form a temperature compensation circuit, when the temperature of the pressure sensor 4 is changed, the resistance value of the thermistor 23 in the temperature compensation circuit is changed along with the change, and the amplification factor of the operational amplification circuit can be changed to perform temperature compensation of output signals.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited by the above-mentioned manner, if the method and the technical solution of the present invention are adopted, the present invention can be directly applied to other occasions without substantial improvement, and the present invention is within the protection scope of the present invention.

Claims

1. The utility model provides a digital pressure gauge for instrument calibration with temperature compensation function, includes casing (1), its characterized in that, install circuit board (11) on the back shrouding of casing (1), install temperature compensation device (2) on circuit board (11), temperature compensation device (2) include fixing base (21) and a fixed section of thick bamboo (22), one side center department that circuit board (11) were kept away from in fixing base (21) is equipped with fixed slot (211), fixing base (21) embedded be equipped with two at least fixed subassembly (3), every fixed subassembly (3) all include a screw thread section of thick bamboo (31), every all mesh on the inner wall of a screw thread section of thick bamboo (31) and be connected with screw thread post (32), every helical spring (33) and dwang (34) are installed respectively to the both ends of screw thread post (32), just fixed block (24) are installed to the center department of a fixed section of thick bamboo (22) plane closed end, fixed block (24) are connected with fixed slot (211) cooperation, just integrated board (221) are installed to the inboard of fixed section of thick bamboo (22), install a plurality of thermistors (23) on integrated board (221), and are a plurality of thermistors (23) pass through the wire and connect the constitution temperature compensation circuit.

2. The digital pressure gauge with temperature compensation function for instrument calibration according to claim 1, wherein a plurality of positioning grooves (212) are uniformly distributed along the circumference of the outer side of the fixing groove (211), and a permanent magnet holder (213) is installed on the inner side of each positioning groove (212).

3. The digital pressure gauge with temperature compensation function for instrument calibration according to claim 2, wherein a plurality of permanent magnet columns (25) are uniformly distributed along the circumference on the side of the fixed cylinder (22) corresponding to the positioning groove (212), and each permanent magnet column (25) is mutually attracted with the permanent magnet seat (213).

4. The digital pressure gauge with the temperature compensation function for instrument calibration according to claim 1, wherein one end of each rotating rod (34) far away from the threaded column (32) extends to the outside through the threaded barrel (31) and the fixed seat (21) and is provided with a rocking handle (35), and a rotating part (36) is arranged at the connection position of the rotating rod (34) and the threaded barrel (31) and the fixed seat (21).

5. The digital pressure gauge with temperature compensation function for instrument calibration according to claim 1, characterized in that a pressure sensor (4) is installed below the temperature compensation device (2).

6. The digital pressure gauge with temperature compensation function for instrument calibration according to claim 1, wherein the fixing seat (21) is fixedly connected with the circuit board (11) through bolts, and the fixing seat (21) is detachable.

7. The digital pressure gauge with temperature compensation function for instrument calibration according to claim 1, wherein the fixed cylinder (22) is a cylinder structure with one end being uncovered.