CN218121204U - Temperature acquisition device for eliminating influence of lead resistance on temperature accuracy - Google Patents

Abstract

The utility model discloses an eliminate temperature acquisition device of lead wire resistance to the influence of temperature degree of accuracy, include: the shell, the bottom fixedly connected with thermal resistance of shell inner wall, the top of shell inner wall is run through there is the temperature acquisition component, the positive both sides of thermal resistance and the both sides of temperature acquisition component bottom all are equipped with connecting element, the equal electrically connected with one-level wire in both sides at thermal resistance top, the positive both sides of thermal resistance all have the second grade wire through connecting element electrically connected. The utility model discloses a potential difference balance reading, the potential difference does not get the electric current, the potentiometric measurement line of thermal resistance, one-level wire, second grade wire and tertiary wire do not have the electric current to flow through promptly, so thermal resistance lead wire and connecting wire's resistance no matter how change can not influence the measurement of thermal resistance yet, and the resistance influence of lead wire can be eliminated completely to this kind of mode, effectively improves the accurate nature of temperature acquisition device temperature detection.

Description

Temperature acquisition device for eliminating influence of lead resistance on temperature accuracy

Technical Field

The utility model relates to a temperature measurement technical field specifically is a eliminate temperature acquisition device of lead wire resistance to the influence of the temperature degree of accuracy.

Background

Temperature measurement is the quantitative measurement of the temperature of an object with a thermometric instrument. The measurement of the physical quantity of temperature is actually a quantity of the object which should change monotonically and significantly with the change of the temperature of the object in a certain temperature range, and the temperature of the object to be measured is indicated by the value of the physical quantity according to the laws of physics.

When the existing temperature acquisition device is used for temperature measurement, the internal resistance of an internal power supply causes errors due to currents in each wire and lead wire, so that other circuit voltages are influenced, and the accuracy and the sensitivity of temperature measurement and acquisition are reduced.

Therefore, it is necessary to provide a temperature acquisition device that eliminates the influence of lead resistance on temperature accuracy to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an eliminate temperature acquisition device of lead wire resistance to the influence of the temperature degree of accuracy to propose the problem that lead wire resistance influences the temperature acquisition degree of accuracy in solving above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a temperature acquisition device that eliminates the effect of lead resistance on temperature accuracy, comprising: the shell, the bottom fixedly connected with thermal resistance of shell inner wall, the top of shell inner wall is run through there is the temperature acquisition component, the positive both sides of thermal resistance and the both sides of temperature acquisition component bottom all are equipped with connecting element, the equal electrically connected with one-level wire in both sides at thermal resistance top, the positive both sides of thermal resistance all have the second grade wire through connecting element electrically connected, the one end that thermal resistance was kept away from to the second grade wire and the one end that thermal resistance was kept away from to the one-level wire are connected with conductive element between, the junction of one-level wire and second grade wire has tertiary wire through conductive element electrically connected, the other end of tertiary wire passes through connecting element and temperature acquisition component electrically connected.

Preferably, the temperature acquisition element comprises a temperature measurement element which is fixedly connected to the top of the inner wall of the shell.

Preferably, the top of the temperature measuring element is electrically connected with a temperature sensing probe, and a sensing end of the temperature sensing probe penetrates through the shell and extends to the outside of the shell.

Preferably, the connecting element comprises a connecting block, a placing groove is formed in the front face of the connecting block, and a conductive coil is embedded in the placing groove.

Preferably, the bottom end of the placement groove is non-closed.

Preferably, the inner thread of the placement groove is connected with a fastening screw which sequentially penetrates through the lead and the conductive coil.

Preferably, the temperature sensing probe is fixedly connected with the shell.

Compared with the prior art, the beneficial effects of the utility model are that: according to the temperature acquisition device for eliminating the influence of the lead resistance on the temperature accuracy, the reading is balanced through potential difference, the potential difference does not take current, and the potential measurement line of the thermal resistance, namely the primary wire, the secondary wire and the tertiary wire do not have current flowing, so that the measurement of the thermal resistance cannot be influenced no matter how the resistance of the thermal resistance lead and the connecting wire is changed, the resistance influence of the lead can be completely eliminated, and the temperature detection accuracy of the temperature acquisition device is effectively improved; through rotating the fastening screw, take out fastening screw from the standing groove inside on the connecting block for the cover is established and is no longer hugged closely with the conductive coil at the one end of wire on the fastening screw, can break off the electric connection with other components of wire, makes the inside wire link of temperature acquisition device make things convenient for the dismouting, improves the inside convenience of overhauing of temperature acquisition device.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a main sectional view showing the structure of the present invention;

FIG. 3 is a schematic side view of the structure of the present invention;

FIG. 4 is a front view of the connecting element of FIG. 2;

fig. 5 is a schematic side cross-sectional view of the construction of the connecting element shown in fig. 4.

In the figure: 1. a housing; 2. a thermal resistor; 3. a temperature acquisition element; 4. a connecting element; 5. a primary wire; 6. a conductive element; 7. a secondary lead; 8. a third-stage wire; 31. a temperature measuring element; 32. a temperature sensing probe; 41. connecting blocks; 42. a placement groove; 43. an electrically conductive coil; 44. and (4) fastening a screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: a temperature acquisition device that eliminates the effect of lead resistance on temperature accuracy, comprising: the casing 1, the bottom fixedly connected with thermal resistance 2 of casing 1 inner wall, the top of casing 1 inner wall is run through there is temperature acquisition element 3, the positive both sides of thermal resistance 2 and the both sides of temperature acquisition element 3 bottom all are equipped with connecting element 4, the equal electrically connected with one-level wire 5 of both sides at thermal resistance 2 top, the positive both sides of thermal resistance 2 all have second grade wire 7 through connecting element 4 electrically connected, be connected with conducting element 6 between the one end that thermal resistance 2 was kept away from to second grade wire 7 and the one end that thermal resistance 2 was kept away from to one-level wire 5, the junction of one-level wire 5 and second grade wire 7 has tertiary wire 8 through conducting element 6 electrically connected, the other end of tertiary wire 8 passes through connecting element 4 and temperature acquisition element 3 electrically connected, the terminal that thermal resistance 2 provided the electric energy is seted up to the side of casing 1, carry out the temperature measurement through control button control temperature acquisition element 3, thermal resistance 2 and one-level wire 5, the equal electrically connected of second grade wire 7 and tertiary wire 8, form the potential difference, the method through potential difference compensation, the principle of mutual compensation according to voltage and known voltage mutual compensation (namely balance) made, avoid because the high accuracy of power supply voltage measurement has not produced, the ground has not had passed through the measuring voltage error under the condition of its high accuracy.

Referring to fig. 1-2, the temperature collecting element 3 includes a temperature measuring element 31, the temperature measuring element 31 is fixedly connected to the top of the inner wall of the housing 1, and the temperature measuring data is transmitted through the temperature measuring element 31.

Referring to fig. 1-2, the top of the temperature measuring element 31 is electrically connected to a temperature sensing probe 32, a sensing end of the temperature sensing probe 32 penetrates through the housing 1 and extends to the outside of the housing 1, and a spherical contact is disposed at the top of the temperature sensing probe 32 to increase the contact area of the top end of the probe.

Referring to fig. 2-5, the connecting element 4 includes a connecting block 41, a placing groove 42 is formed in a front surface of the connecting block 41, a conductive coil 43 is embedded in the placing groove 42, and current and voltage are transmitted through the conductive coil 43.

Referring to fig. 2 to 5, the bottom end of the placement groove 42 is non-closed for placing the wire ends of the primary wire 5, the secondary wire 7 or the tertiary wire 8.

Referring to fig. 2-5, the internal thread of the placement groove 42 is connected with a fastening screw 44 which sequentially penetrates through the conductive wire and the conductive coil 43, two ends of the first-level conductive wire 5, the second-level conductive wire 7 and the third-level conductive wire 8 are respectively provided with a wire hole which is penetrated through by the fastening screw 44, the fastening screw 44 penetrates through a wire end of the conductive wire through the wire hole and is screwed tightly, and one end of the conductive wire is tightly attached to the conductive coil 43 in the placement groove 42, so that the electrical connection is completed.

Referring to fig. 1, the temperature sensing probe 32 is fixedly connected to the housing 1, and the front surface of the housing 1 is provided with a control button and a display, and the display displays the temperature data acquired by the temperature acquisition element 3.

The working principle is as follows: as shown in fig. 1 to 5, in using the temperature acquisition device for eliminating the influence of the lead resistance on the temperature accuracy, first, the current is transmitted to two secondary leads 7 through two conductive elements 6 by two primary leads 5 connected with the top port of the thermal resistor 2, and then transmitted into the thermal resistor 2 through two connecting elements 4 by two secondary leads 7, can provide constant current for the thermal resistor 2, the primary lead 5 converts the resistor into a voltage signal, the voltage signal is transmitted to two tertiary leads 8 through two conductive elements 6, the voltage signal is transmitted to a temperature measuring element 31 in the temperature acquisition element 3 through two connecting elements 4 by utilizing the two tertiary leads 8, namely, the temperature sensing probe 32 is electrified and temperature detection is carried out, the potential difference is measured with high precision according to the principle that the measured voltage and the known voltage compensate each other (namely balance), when the reading is balanced by the potential difference, the potential difference does not take current, no current flows through the potential measuring lines of the thermal resistor 2, namely the primary lead, the secondary lead 7 and the tertiary lead 8, the resistance of the lead of the thermal resistor 2 and the connecting leads does not affect the measurement of the thermal resistor 2 in any way, the method can completely eliminate the resistance influence of the lead wire, so that the temperature acquisition device can carry out high-precision temperature detection, the fastening screw 44 is taken out from the placing groove 42 on the connecting block 41 by rotating the fastening screw 44, so that one end of the conducting wire sleeved on the fastening screw 44 is not tightly attached to the conducting coil 43, the electric connection of the lead and other elements can be disconnected, the mounting and dismounting of each lead are convenient, and the characteristic of the temperature acquisition device for eliminating the influence of the lead resistance on the temperature accuracy is realized.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A temperature acquisition device that eliminates the effects of lead resistance on temperature accuracy, comprising: shell (1), its characterized in that, the bottom fixedly connected with thermal resistance (2) of shell (1) inner wall, the top of shell (1) inner wall is run through there is temperature acquisition element (3), the both sides of thermal resistance (2) positive both sides and temperature acquisition element (3) bottom all are equipped with connecting element (4), the equal electrically connected of both sides at thermal resistance (2) top has one-level wire (5), thermal resistance (2) positive both sides all have second grade wire (7) through connecting element (4) electrically connected, be connected with between the one end of thermal resistance (2) is kept away from with one-level wire (5) to one end of second grade wire (7) one end and one-level wire (5), the junction of one-level wire (5) and second grade wire (7) has tertiary wire (8) through electrically connected of electrically conductive element (6), the other end of tertiary wire (8) passes through connecting element (4) and temperature acquisition element (3) electrically connected.

2. The temperature acquisition device for eliminating the influence of lead wire resistance on temperature accuracy as claimed in claim 1, wherein: the temperature acquisition element (3) comprises a temperature measurement element (31), and the temperature measurement element (31) is fixedly connected to the top of the inner wall of the shell (1).

3. The temperature acquisition device for eliminating the influence of lead wire resistance on temperature accuracy as claimed in claim 2, wherein: the top of the temperature measuring element (31) is electrically connected with a temperature sensing probe (32), and the sensing end of the temperature sensing probe (32) penetrates through the shell (1) and extends to the outside of the shell (1).

4. The temperature acquisition device for eliminating the influence of lead wire resistance on temperature accuracy as claimed in claim 3, wherein: the connecting element (4) comprises a connecting block (41), a placing groove (42) is formed in the front face of the connecting block (41), and a conductive coil (43) is embedded in the placing groove (42).

5. The temperature acquisition device for eliminating the influence of lead wire resistance on temperature accuracy as claimed in claim 4, wherein: the bottom end of the placing groove (42) is non-closed.

6. The temperature acquisition device for eliminating the influence of lead wire resistance on temperature accuracy as claimed in claim 4, wherein: and a fastening screw (44) which sequentially penetrates through the lead and the conductive coil (43) is connected with the inner thread of the placing groove (42).

7. The temperature acquisition device for eliminating the influence of lead wire resistance on temperature accuracy as claimed in claim 3, wherein: the temperature sensing probe (32) is fixedly connected with the shell (1).

Images