CN213714601U

CN213714601U - Strain type pressure sensor and float needle

Info

Publication number: CN213714601U
Application number: CN202022856726.9U
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: 2021-07-16
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 casing and the butt joint tip that forms in casing one end, be equipped with strain gauge spare in the casing, strain gauge spare includes strainometer and several lead wires that are connected with the strainometer, surface on the casing is equipped with several depressed parts to the indent along the periphery direction at intervals; 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 component's butt joint tip is connected, during the measurement, the utility model discloses after strain gauge pressure sensor docks with the floating needle, floating needle and testee direct contact have improved measuring accuracy to carminative function has been realized.

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. Meanwhile, when the existing strain gauge pressure sensor for direct measurement is arranged in a mold, the strain gauge pressure sensor is attached to and installed in a mounting hole in the mold, and the exhaust function cannot be realized.

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

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 float needle is contradicted on strain gauge pressure sensor when measuring the pressure of testee, and is formed with the clearance between sensor installation back and mould to improve measuring accuracy and to the exhaust of mould.

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, 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, and a plurality of concave parts are inwards and concavely arranged on the outer surface of the shell at intervals along the circumferential surface direction; 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, 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 also discloses a float needle for assemble the pressure of measuring the testee together with strain gauge pressure sensor, it includes contact tip and the conduction portion that is connected with contact tip, conduction portion with sensing component is connected, the surface homogeneous phase interval indent of contact tip and conduction portion is equipped with several float needle depressed part, when installing in the mould, float needle depressed part forms the alternate clearance of several with the mould.

Preferably, an end surface of the contact end portion is formed with a contact surface that contacts an object to be measured.

Preferably, a seal is provided on the outside of the contact end.

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 a strain gauge pressure sensor and float needle have realized the exhaust function to mould etc. through setting up the depressed part.

Drawings

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

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

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

FIG. 4 is a schematic structural view of the strain gauge pressure sensor and the floating needle after installation of the strain gauge pressure sensor and the floating needle;

fig. 5 is a schematic structural diagram of a housing in a mold according to the strain gauge pressure sensor of 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.

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, 135, a floating needle recess part, 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 recess part, 15, a mold, 16, a gap, 17, a sleeve, 18, a pressing block, 19 and a fastening piece.

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, the strain gauge pressure sensor includes a sensing unit 11 and a connecting unit 12 connected to the sensing unit 11, wherein the sensing unit 11 includes a housing 141 and a butt end portion formed at one end of the housing 141.

As shown in fig. 1 and 2, a strain gauge member is disposed in the casing 141, the strain gauge member includes a strain gauge 142 and a plurality of leads 143 connected to the strain gauge 142, the casing 141 transmits the received change to the strain gauge 142, the strain gauge 142 is configured to convert the deformation caused by the pressure into an electrical signal with a variable resistance, the butt end portion 144 is formed at one end of the casing 141, a lead pin 145 is formed in the butt end portion 144, one end of each of the leads 143 is connected to the strain gauge 142, and the other end of each of the leads 143 extends into the butt end portion 144 and is fixedly connected to the lead pin 145.

More specifically, as shown in fig. 2 and 5, the housing 141 includes a housing body 146 and a cover 147 covering the housing body 146, the cover 147 and the abutting end 144 are designed as a whole or connected, and the cover 147 covers the housing body 146 and is fixedly connected thereto by a snap fit or other connection method. A plurality of inward concave portions 148 are provided on the outer surface of the housing 141 at intervals in the direction of the circumferential surface, and the concave portions 148 are designed such that the housing 141 is petaloid in cross section. The recess 148 is preferably disposed on the outer circumferential surface of the housing 141, and may be disposed on other portions of the sensing assembly 11. When the strain gauge pressure sensor in this embodiment is installed in the mold 15, the existence of the recesses 148 enables a plurality of gaps 16 to be formed between the outer surface of the housing 141 and the mold 15, so as to exhaust the mold 15.

As shown in fig. 1 and 3, 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 used for connecting with 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 with the pin, and the cable connector (not shown) formed in the plug portion 122 is used for forming an electrical connection between external devices. 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. 4, the utility model discloses still disclose a float needle 13, float needle 13 carries out the measurement of pressure after interfacing mutually with strain gauge pressure sensor, float needle 13 includes contact tip 131 and the conduction portion 132 that is connected with contact tip 131, the surface homogeneous phase interval of contact tip 131 and conduction portion 132 is equipped with inside several float needle depressed part 135, and is the same with the depressed part 148 function that is equipped with on the casing. When installed in the mold 15, a plurality of spaced gaps are formed with the mold 15 to allow venting of the mold 15. The contact end 131 is also provided at its periphery with a seal 134 to prevent molten measurement objects 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 of figure 6, during the installation, install sensing component 11 and coupling assembling 12 in the installation space in mould 15, install floating needle 13 and sensing component 11 mutually and install in mould 15, and the contact surface 133 that makes the floating needle contacts with the measurand measuring face of testee, is fixed in mould 15 with sensing component 11 and coupling assembling 12 through sleeve pipe 17, briquetting 18 and fastener 19 simultaneously to the installation has been realized, during the use, is connected the plug portion 122 of coupling assembling with the external equipment electricity, thereby shows and monitors the signal of telecommunication that the pressure of the testee that will measure turned into.

The utility model provides a sensing assembly 11 only needs to select different float pins 13 according to the difference of testee atress scope, can realize corresponding measurement, and reusability is high. The utility model discloses a at the exhaust of casing 14 to mould 15.

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, but the lead wire in the casing 141 and the cover body is directly connected with the connection cable, specifically selecting the setting according to the actual detection requirement.

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 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 a lead pin is formed in the butt end portion, the lead pin being connected with the lead.

3. The strain gauge pressure sensor according to claim 2, 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.

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

5. A floating needle is used for being abutted with the strain type pressure sensor of claim 1 to measure the pressure of a measured object, and is characterized by comprising a contact end part and a conduction part connected with the contact end part, wherein the conduction part is connected with the sensing assembly, and a plurality of floating needle concave parts are inwards arranged on the outer surface of the contact end part or the conduction part at intervals along the circumferential surface direction in a concave mode.

6. The float pin according to claim 5, wherein an end face of the contact end portion is formed with a contact surface which is brought into contact with an object to be measured.

7. The float needle of claim 5 wherein the outside of the contact end is provided with a seal.