CN213842504U

CN213842504U - Strain type pressure sensor and float needle

Info

Publication number: CN213842504U
Application number: CN202022847744.0U
Authority: CN
Inventors: 许刚
Original assignee: Suzhou Wanku Information Technology Co ltd
Current assignee: Suzhou Wanku Information Technology Co ltd
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-07-30
Anticipated expiration: 2030-12-01

Abstract

The utility model discloses a strain type pressure sensor and float needle, strain type pressure sensor includes sensing element and coupling assembling, sensing element includes the casing and forms in the butt joint tip of casing one end, and the outer terminal surface of butt joint tip forms the butt joint face, be equipped with the strain gauge spare in the casing, the strain gauge spare includes strainometer and the several lead wire that is connected with the strainometer, coupling assembling includes butt joint portion, plug portion and connects the connecting cable of butt joint portion and plug portion, coupling assembling passes through butt joint portion with sensing element's butt joint tip is connected, during the measurement, the utility model discloses a strain type pressure sensor and float needle dock mutually, and the float needle improves measuring accuracy with the testee direct contact.

Description

Strain type pressure sensor and float needle

Technical Field

The utility model belongs to the technical field of pressure sensor and specifically relates to a strain gauge pressure sensor and float needle is related to.

Background

With the development of intelligent manufacturing and industrial internet of things, sensors are more and more widely applied. The resistance strain type pressure sensor is a pressure sensor which converts the measured pressure into the corresponding resistance value change by utilizing an elastic sensitive element and a resistance strain gauge, is a sensor which is applied to a plurality of pressure sensors, and is widely applied to measuring the internal pressure of a pipeline, the pressure of gas of an internal combustion engine, the injection pressure, weighing, fluid pressure in various fields and the like.

The traditional button type strain pressure sensor is arranged below an element for indirectly transmitting force, such as a thimble or an insert pin of a plastic mould, for measuring the pressure of a melt, belongs to indirect measurement, is easy to cause measurement error, and has large interference factors due to the adoption of the thimble or the insert pin and other indirect transmission force; the installation repeatability is poor, and the influence factors are more; the elements that transmit the force run the risk of deformation, reducing the accuracy of the measurement; when the stress range is large and the force transmission element is not properly selected in the use process, the pressure sensor is easy to damage.

Therefore, there is a need for an improved pressure sensor to solve the problems of measurement error and easy replacement.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a strain gauge pressure sensor and float needle, the strain gauge pressure sensor can select to carry out the butt joint contact with the float needle of difference is nimble during the pressure measurement to the realization carries out pressure test to the testee of difference.

In order to achieve the above object, the utility model provides a following technical scheme: a strain type pressure sensor is used for measuring the pressure of a measured object and comprises a sensing assembly and a connecting assembly, wherein the sensing assembly comprises a shell and a butt joint end part formed at one end of the shell, the outer end face of the butt joint end part forms a butt joint face, a strain gauge part is arranged in the shell and comprises a strain gauge and a plurality of lead wires connected with the strain gauge; the connecting assembly comprises a butt joint part, a plug part and a connecting cable for connecting the butt joint part and the plug part, and is connected with the butt joint end part of the sensing assembly through the butt joint part.

Preferably, the abutting surface of the abutting end part abuts against a floating needle, and the floating needle is in contact with the object to be measured.

Preferably, the abutment surface is convex or flat.

Preferably, the outer surface of the shell is provided with a plurality of concave parts inwards at intervals along the circumferential direction.

Preferably, a lead pin is formed in the butt joint end portion, and the lead pin is connected with the lead.

Preferably, the connection cable extends into the abutting portion and the plug portion to form a cable connector, and the connection assembly is electrically connected to the lead pin through the cable connector formed in the abutting portion.

Preferably, the sensing assembly and the connecting assembly are split or integrated.

The utility model discloses still disclose a float needle for dock the pressure in order to measure the testee with above-mentioned strain type pressure sensor, the float needle includes contact tip and the conduction portion that is connected with contact tip, conduction portion is connected with sensing component.

Preferably, the conductive portion is abutted against an abutment surface of the sensing component.

Preferably, a sealing element is arranged on the outer side of the contact end part of the floating needle, and a contact surface which is in contact with a measured object is formed on the end surface of the contact end part.

The utility model has the advantages that:

1. compare with current pressure sensor, the utility model discloses a strain gauge pressure sensor and float needle carry out pressure measurement through with the measured object direct contact, have overcome the component of indirect measurement in-process transmission power because factors such as deformation have aroused measuring error, have improved measuring accuracy.

2. The utility model discloses strain gauge pressure sensor can select corresponding different float needles and the measurement of testee direct contact pressure according to the stroke range of measuring object pressure, and compatible good and installation convenient to use is reliable.

Drawings

Fig. 1 is a schematic structural diagram of a strain gauge pressure sensor according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of the strain gauge pressure sensor of the present invention;

fig. 3 is an exploded schematic view of the sensing assembly of the present invention;

fig. 4 is an exploded schematic view of the connection assembly of the present invention;

fig. 5 is a schematic structural view of the strain gauge pressure sensor and the float needle according to the present invention;

fig. 6 is a schematic structural view of the strain gauge pressure sensor and the float pin of the present invention fixed in a mold;

fig. 7, 8, 9 and 10 are schematic structural diagrams of the strain gauge pressure sensor and different float pins according to the present invention after assembly.

Reference numerals: 11. the sensor assembly comprises a sensing assembly, 12, a connecting assembly, 121, a butt joint part, 122, a plug part, 123, a connecting cable, 124, a cable joint, 125, a butt joint part body, 13, a floating needle, 131, a contact end part, 132, a conduction part, 133, a contact surface, 134, a sealing piece, 141, a shell, 142, a strain gauge, 143, a lead, 144, a butt joint end part, 145, a lead pin, 146, a shell body, 147, a cover body, 148, a butt joint surface, 15, a die, 16, a sleeve, 17, a pressing block, 18, a fastener, 2 and a concave part.

Detailed Description

The technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.

The utility model discloses a strain gauge pressure sensor, it uses with a cooperation of floating needle 13 butt joint back for pressure to the testee carries out direct measurement and turns into the pressure sensor of resistance value output with the pressure value that measures. As shown in fig. 1 and 2, the strain gauge pressure sensor includes a sensing assembly 11 and a connecting assembly 12 connected to the sensing assembly 11, the sensing assembly 11 includes a housing 141 and a butt end portion 144 formed at one end of the housing 141, an outer end surface of the butt end portion 144 forms a butt surface 148, and the butt surface 148 is an outer convex surface or a flat surface suitable for butt connection with the float pin 13.

As shown in fig. 2 and 3, a strain gauge member is disposed in the housing 141, the strain gauge member includes a strain gauge 142 and a plurality of leads 143 connected to the strain gauge 142, the strain gauge 142 is configured to convert a deformation caused by the pressure into an electrical signal with a variable resistance, the abutting end portion 144 is formed at one end of the housing 141, a lead pin 145 is formed in the abutting end portion 144, one end of each lead 143 is connected to the strain gauge 142, and the other end extends into the abutting end portion 144 and is fixedly connected to the lead pin 145. Preferably, in the embodiment of the present invention as shown in fig. 1, a plurality of recesses 2 are formed on the outer surface of the housing 141 at intervals, and the recesses 2 allow the pressure sensor to be installed in the mounting hole of the mold 15 and then exhaust the mold 15 by forming a certain gap between the pressure sensor and the mounting hole.

More specifically, the housing 141 includes a housing body 146 and a cover 147 covering the housing body 146, when the housing 141 is mounted on the floating needle 13, the housing body 146 is connected to the conducting portion 132 of the floating needle, the cover 147 is integrally designed or connected to the abutting end portion 144, and the cover 147 covers the housing body 146 and is fixedly connected thereto by a snap fit or other connection method.

As shown in fig. 1 and 4, the connection assembly 12 is used for further transmitting the electrical signal converted by the sensing assembly 11 to an external device, such as a signal amplifier (not shown) or the like, so as to display and monitor the pressure measurement of the measurement object. The connecting assembly 12 includes a docking portion 121, a plug portion 122, and a connecting cable 123 connecting the cable connector 124 and the plug portion 122, the docking portion 121 is configured to be connected to the docking end portion 144, and includes a connector portion and a docking portion body 125, the connecting cable 123 extends into the docking portion 121 and the plug portion 122 respectively and forms a corresponding cable connector 124, the cable connector 124 formed in the docking portion 121 is electrically connected to the lead pin 145, and a cable connector (not shown) formed in the plug portion 122 is configured to be electrically connected to an external device. In this embodiment, the abutting end portion 144 is fixedly connected to the abutting portion 121 of the connecting assembly in a threaded manner, so that the sensing assembly 11 is fixedly connected to the connecting assembly 12, and the connecting assembly is also conveniently detached. Of course, the connection between the abutting end 144 and the abutting portion 121 may also be fixed by a snap or other means, so as to achieve convenient installation and detachment.

As shown in fig. 5, the utility model discloses still disclose a float needle 13, it with the utility model discloses a strain gauge pressure sensor docks mutually, float needle 13 includes contact tip 131 and the conduction portion 132 that is connected with contact tip 131, conduction portion 132 is connected with sensing component 11, specifically, conduction portion 132 and sensing component 11 can contradict in the face 148 and realize the conduction of butt joint contact between them in order to carry out pressure, the terminal surface of contact tip 131 is formed with the contact surface 133 that contacts with the measured object, contact surface 133 and measured object direct contact. In this embodiment, a sealing member 134 is further provided on the outer side of the contact end 131 to prevent a molten measurement object from penetrating into the float pin 13.

The utility model discloses strain gauge pressure sensor is when measuring testee pressure, and it can install earlier and detect the pressure of testee in as shown mould 15 back in figure 6, during the installation, install sensing subassembly 11, coupling assembling 12 in installation space in the mould 15, and make sensing subassembly 11 dock with different floating needle 13 as required, floating needle 13 contacts with the measuring face of testee to be measured, is fixed in mould 15 with sensing subassembly 11 and coupling assembling 12 through sleeve pipe 16, briquetting 17 and fastener 18 simultaneously to realized the installation of sensor, during the use, carry out the electricity with coupling assembling's plug portion 122 and external equipment and be connected, thereby show and control the signal of telecommunication that the pressure that will measure the testee turned into. Further, when the strain gauge pressure sensor is mounted in the mold 15, a plurality of gaps (not shown) are formed between the concave portion 2 on the outer surface of the housing and the mounting hole of the mold 15 to achieve the air exhaust of the mold.

Further, the utility model discloses sensing subassembly 11 is according to testee atress scope, shape and size and the floating needle 13 of the contact surface 133 of the floating needle of the optional pressure sensor who is suitable for the pressure range who bears for floating needle 13's lifting surface area size and strain gauge pressure sensor phase-match can realize accurate measurement, and is right simultaneously floating needle 13's shape does not have the requirement, can set to circular, square or opposite sex etc. like the different implementation modes that figure 7, 8, 9 and 10 show, through the accurate calculation to measuring object atress scope, optional use suitable floating needle 13, in order to avoid the damage that causes to the testee of different atress scopes, simultaneously, because floating needle 13 directly contacts with the object of measurationing, thereby more accurate completion is measured.

The utility model discloses a pressure sensor's sensing subassembly 11 and coupling assembling 12 adopt split type design for coupling assembling 12 is convenient for change, can directly change the coupling assembling part when coupling assembling 12 damages promptly, does not influence pressure sensor's normal use. Of course, in other embodiments of the present invention, an integrated design may also be adopted, and the integrated design does not need the butt-joint portion 121 and the butt-joint end portion 144, but a direct connection manner between the lead wires in the housing and the cover body and the connection cable may be adopted, and the setting is selected according to actual detection requirements.

Optionally, the utility model discloses not only can adopt the wired connection mode of this embodiment to carry out pressure measurement and control to the object between sensing subassembly 11 and the coupling assembling 12, also can realize the transmission and the measurement and the control of two-component signal of telecommunication through wireless signal transmission mode.

The technical contents and features of the present invention have been disclosed as above, however, those skilled in the art can still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention, therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications without departing from the present invention, and should be covered by the claims of the present patent application.

Claims

1. A strain type pressure sensor is used for measuring the pressure of a measured object and is characterized by comprising a sensing assembly and a connecting assembly, wherein the sensing assembly comprises a shell and a butt joint end part formed at one end of the shell, the outer end face of the butt joint end part forms a butt joint face, a strain gauge part is arranged in the shell and comprises a strain gauge and a plurality of lead wires connected with the strain gauge; the connecting assembly comprises a butt joint part, a plug part and a connecting cable for connecting the butt joint part and the plug part, and is connected with the butt joint end part of the sensing assembly through the butt joint part.

2. The strain gauge pressure sensor according to claim 1, wherein the abutting surface of the abutting end portion abuts a floating pin, and the floating pin is in contact with the object to be measured when the pressure of the object to be measured is measured.

3. A strain gauge pressure sensor according to claim 1, wherein the abutment surface is convex or flat.

4. The strain gauge pressure sensor according to claim 1, wherein a lead pin is formed in the butt end portion, the lead pin being connected with the lead.

5. The strain gauge pressure sensor according to claim 4, wherein the connection cable has cable tabs formed therein extending into the mating portion and the plug portion, respectively, and the connection member is electrically connected to the lead pins through the cable tabs formed in the mating portion.

6. The strain gauge pressure sensor of claim 1, wherein the sensing assembly and the connecting assembly are split or integrated.

7. A floating pin for interfacing with the strain gauge pressure sensor of claim 1 to measure a pressure of a measured object, wherein the floating pin comprises a contact end portion and a conductive portion connected to the contact end portion, the conductive portion being connected to a sensing assembly.

8. The float needle of claim 7 wherein said conductive portion interfaces with an interface surface of said sensing assembly.

9. The float pin according to claim 7, wherein a seal is provided on an outer side of a contact end portion of the float pin, and an end surface of the contact end portion is formed with a contact surface which is in contact with an object to be measured.