CN204255424U - Thermal mass flowmeter - Google Patents

Abstract

A thermal mass flow meter for use in a pipeline having a working fluid flowing therein, comprising: the device comprises a shell, a control module, a plurality of probes, a flow calculation circuit and a heating module. The control module is configured in the accommodating space. The probe rods are connected to one end of the shell. The flow calculating circuit is electrically connected with the control module and consists of a plurality of circuit boards arranged inside the probe rods and a plurality of temperature sensing units electrically and fixedly connected with the circuit boards. The heating module is electrically connected to one of the circuit boards. The control module controls the heating module to heat the fluid in the pipeline, the flow calculation circuit senses the temperature inside the pipeline, and the flow calculation circuit transmits the variation value of the sensed temperature to the control module so as to sense the flow speed of the fluid inside the pipeline.

Description

Caloic formula flowmeter

Technical field

The utility model relates to a kind of flowmeter, particularly relates to a kind of caloic formula flowmeter in order to measure rate of flow of fluid.

Background technology

Whether caloic formula flowmeter is the flow velocity at the fluid in order to measure channel interior, have in flowing with the fluid sensing channel interior.Traditional caloic formula flowmeter is when being installed on pipeline, multiple probes on this caloic formula flowmeter will be positioned at this channel interior, this caloic formula flowmeter is utilize two traditional resistors and two thermal resistors to be electrically connected Wheatstone bridge circuits on sensing, and the one two thermal resistors being installed on those probes is inner, it is outside that these two traditional resistors are then installed on this caloic formula flowmeter, is provided with a heating module in another probe.

When sensing the flow velocity of channel interior fluid, this caloic formula flowmeter inversely senses with temperature difference and flow velocity, the heating unit being installed on this probe inside can be heated at the control module of caloic formula flowmeter, when the Wheatstone bridge circuit that two traditional resistors and two thermal resistors connect is equilibrium state, namely resistance value is not had to change, so there is no electric current passes back on this control module, the flow velocity of the fluid therefore in this pipeline is normal, represents that fluid has proper flow.When the temperature of heating unit heats remains in a standstill near those probes, the resistance value of two thermal resistors of this probe inside will change, the variable quantity of electric current is made to reach on this control module, can learn that after control module process the flow velocity of fluid is slack-off or do not flow, because temperature and flow velocity are inversely.

Above-mentioned caloic formula flowmeter can sense the flow velocity of channel interior fluid, two traditional resistors due to the Wheatstone bridge circuit of caloic formula flowmeter are positioned at this flowmeter outside, when measuring, these two traditional resistors are vulnerable to ambient temperature impact, make measurement become inaccurate.

Utility model content

Therefore, fundamental purpose of the present utility model, be to solve traditional disappearance problem, in the Wheatstone bridge circuit of caloic formula flowmeter four resistor is all that temperature sensing unit replaces with thermal resistor by the utility model, and one temperature sensing unit and a heating module are installed in same probe, again other three temperature sensing units are installed in another probe, this temperature sensing unit is made to be subject to outside ambient temperature effect, energy precise volume measures the rate of flow of fluid of channel interior, and measures under being adapted at the environment of high temperature, high flow rate.

For reaching above-mentioned purpose, the utility model provides a kind of caloic formula flowmeter, is applied to a pipeline, is provided with working fluid in this pipeline, and this caloic formula flowmeter comprises:

One housing, its inside has an accommodation space;

One control module, is configured in this accommodation space;

Multiple probe, to be connected to this shell one end, those probe inside respectively have an installing space communicated with accommodation space;

Flow meters calculates circuit, and be electrically connected with this control module, this flow rate calculation circuit is made up of multiple multiple temperature sensing units being installed on the installing space of those probe inside;

One heating module, is electrically connected on the one of those circuit boards, and is electrically connected with this control module.

Above-mentioned caloic formula flowmeter, wherein this flow rate calculation circuit more includes multiple circuit board, those circuit boards are by a first circuit board, one second circuit board composition, the plurality of temperature sensing unit is by one first temperature sensing unit, one second temperature sensing unit, one the 3rd temperature sensing unit and one the 4th temperature sensing unit composition, be electrically connected on this first circuit board with this first temperature sensing unit, this second temperature sensing unit, 3rd temperature sensing unit and the 4th temperature sensing unit are electrically connected on this second circuit board, again this first circuit board and this second circuit board are electrically connected into after Wheatstone bridge circuit and are electrically connected with this control module.

Above-mentioned caloic formula flowmeter, wherein those multiple probes include one first probe and one second probe, and this first circuit board is installed in the installing space of this first probe, and this second circuit board is installed in the installing space of this second probe.

Above-mentioned caloic formula flowmeter, wherein this first temperature sensing unit, this second temperature sensing unit, the 3rd temperature sensing unit and the 4th temperature sensing unit are thermal resistor.

Above-mentioned caloic formula flowmeter, wherein this heating module, is made up of one first heating unit and one second heating unit, and this first heating unit and this second heating unit are electrically connected on first circuit board, and are positioned at the both sides of this first temperature sensing unit.

Above-mentioned caloic formula flowmeter, wherein those probes are made up of one first probe, the second probe, the 3rd probe and the 4th probe.

Above-mentioned caloic formula flowmeter, wherein this flow rate calculation circuit more includes multiple circuit board, those circuit boards are by a first circuit board, one second circuit board, one tertiary circuit plate and one the 4th circuit board composition, the plurality of temperature sensing unit is by one first temperature sensing unit, one second temperature sensing unit, one the 3rd temperature sensing unit and one the 4th temperature sensing unit composition, electrically be fixed on this first circuit board with this first temperature sensing unit, this second temperature sensing unit is electrically fixed on this second circuit board, 3rd temperature sensing unit is electrically fixed on this tertiary circuit plate, 4th temperature sensing unit is electrically fixed on the 4th circuit board, with this first circuit board, this second circuit board, this tertiary circuit plate and the 4th circuit board are electrically connected in Wheatstone bridge circuit, be electrically connected with this control module again, by this first circuit board, this second circuit board, this tertiary circuit plate and the 4th circuit board are installed on this first probe, this second probe, in 3rd probe and the 4th probe.

Above-mentioned caloic formula flowmeter, wherein this heating module, is made up of one first heating unit and one second heating unit, and this first heating unit and this second heating unit are electrically connected on first circuit board, and are positioned at the both sides of this first temperature sensing unit.

Below in conjunction with the drawings and specific embodiments, the utility model is described in detail, but not as to restriction of the present utility model.

Accompanying drawing explanation

Fig. 1, caloic formula flowmeter schematic appearance of the present utility model;

Fig. 2 is the partial enlargement cross-sectional schematic of Fig. 1;

Fig. 3, flowmeter using state schematic diagram of the present utility model;

Fig. 4, multiple temperature sensing unit of the present utility model connection is in Wheatstone bridge circuit schematic diagram;

Fig. 5, another embodiment schematic diagram of caloic formula flowmeter of the present utility model.

Wherein, Reference numeral

Housing 1

Accommodation space 11

Through hole 12

Group connecting part 13

Control module 2

Multiple probe 3

First probe 31

Second probe 32

3rd probe 33

4th probe 34

Installing space 311,321

Flow rate calculation circuit 4

First circuit board 41

Second circuit board 42

Tertiary circuit plate 45

4th circuit board 46

First temperature sensing unit 43a

Second temperature sensing unit 43b

3rd temperature sensing unit 43c

4th temperature sensing unit 43d

Heating module 5

First heating unit 51

Second heating unit 52

Pipeline 6

Passage 61

Fluid 7

Embodiment

Hereby about the technical content and a detailed description of the present utility model, accompanying drawing is coordinated now to be described as follows:

Refer to Fig. 1 and Fig. 2, the partial enlargement cross-sectional schematic of caloic formula flowmeter outward appearance of the present utility model and Fig. 1.As shown in the figure: caloic formula flowmeter of the present utility model, comprising: housing 1, control module 2, multiple probe 3, flow meters calculate circuit 4 and a heating module 5.

This housing 1, its inside has an accommodation space 11, and this housing 1 has at least two through holes 12, this two through hole 12 communicates with this accommodation space 11, this two through hole 12 is for the transmission line (not shown) connecting external signal transmission, another have the group connecting part 13 that is flank of thread below housing 1, can be connected to pipeline (not shown) for this housing 1.

This control module 2, be configured in the accommodation space 11 of this housing 1 that (circuit due to this control module 2 is conventional art, seldom circuit structure is sayed at this), to accept the sensing signal that flow rate calculation circuit 4 returns, and control heating module 5 carries out the actions such as heating.

The plurality of probe 3, to be connected to below this group connecting part 13, those probes 3 are made up of one first probe 31 and one second probe 32, and this first probe 31 and this second probe 32 inner tool one installing space 311,321, this installing space 311,321 communicates with the accommodation space 11 of housing 1.In detail in this figure, those probes 3 are stainless steel.

This flow rate calculation circuit 4, is electrically connected with this control module 2, and this flow rate calculation circuit 4 is made up of first circuit board 41, second circuit board 42 and four temperature sensing unit 43a ~ 43d.Wherein, be electrically connected on this first circuit board 41 with this first temperature sensing unit 43a, this second temperature sensing unit 43b, 3rd temperature sensing unit 43c and the 4th temperature sensing unit 43d is electrically connected on this second circuit board 42, again this first circuit board 41 and this second circuit board 42 are electrically connected after in Wheatstone bridge circuit by wire (not shown), and be electrically connected with this control module 2, respectively this first circuit board 41 is installed in the installing space 311 of this first probe 31 again, this second circuit board 42 is installed in the installing space 321 of this second probe 32.In detail in this figure, this first temperature sensing unit 43a ~ the 4th temperature sensing unit 43d is thermal resistor.

This heating module 5, is made up of one first heating unit 51 and one second heating unit 52.This first heating unit 51 and this second heating unit 52 are electrically connected on first circuit board 41, and be positioned at the both sides of this first temperature sensing unit 43a, this first heating unit 51 and this second heating unit 52 are electrically connected with this control module 2 by this first circuit board 41, heat the fluid in pipeline by the control of this control module 2.

Refer to Fig. 3 and Fig. 4, flowmeter using state of the present utility model and the connection of multiple temperature sensing unit are in Wheatstone bridge circuit schematic diagram.As shown in the figure: the first temperature sensing unit 43a of the present utility model ~ the 4th temperature sensing unit 43d connects into a Wheatstone bridge circuit, the link 44 of this Wheatstone bridge circuit is electrically connected this control module 2.

When caloic formula flowmeter is connected on pipeline 6 by the group connecting part 13 groups of this housing 1, this first probe 31 and the second probe 32 will be arranged in the passage 61 of this pipeline 6, should when fluid 7 flows in passage 61, this control module 2 sequentially can heat the first heating unit 51 of heating module 5 and this second heating unit 52 being installed on this first probe 31 inside, when Wheatstone bridge circuit is equilibrium state, be 43b/43a=43d/43c, resistance value does not change and so there is no electric current and flow through control module 2, the flow velocity of the fluid 7 therefore in this pipeline 6 passage 61 is normal, represent that fluid 7 has proper flow.

When the first heating unit 51 of heating module 5 and the temperature of the second heating unit 52 heating remain in a standstill near this first probe 31 and this second probe 32, the resistance value of the first temperature sensing unit 43a ~ the 4th temperature sensing unit 43d in this first probe 31 and this second probe 32 will change, again when the resistance value that this control module 2 senses the first temperature sensing unit 43a ~ the 4th temperature sensing unit 43d changes, can learn that the flow velocity of fluid 7 is slack-off or do not flow, because temperature and flow velocity are inversely.

Because this first temperature sensing unit 43a ~ the 4th temperature sensing unit 43d is all placed in those probes 3 inside, therefore, it is possible to accurate sensing channel interior temperature change value, measure the flow velocity of this channel interior fluid with precise volume, the fluid be therefore suitable under high temperature, high flow rate measures.

Refer to Fig. 5, another embodiment schematic diagram of caloic formula flowmeter of the present utility model.As shown in the figure: roughly the same with Fig. 1 in the present embodiment, it is four that institute's difference is in the plurality of probe 3, the first probe 31, second probe 32, the 3rd probe 33 and the 4th probe 34 respectively, this first temperature sensing unit 34a ~ the 4th temperature sensing unit 34d is electrically connected at first circuit board 41, second circuit board 42 respectively, on tertiary circuit plate 45 and the 4th circuit board 46, similarly this heating module 5 is electrically connected on first circuit board 41.Again by first circuit board 41, second circuit board 42, tertiary circuit plate 45 and the 4th circuit board 46 are electrically connected after in Wheatstone bridge circuit with control module 2, then are installed on respectively in this first probe 31, second probe 32, the 3rd probe 33 and the 4th probe 34.

When flowmeter is connected on pipeline 6 by the group connecting part 13 groups of this housing 1 (as shown in Figure 3), this first probe 31, second probe 32, 3rd probe 33 and the 4th probe 34 will be arranged in the passage 61 of this pipeline 6, should when fluid 7 flows in passage 61, this control module 2 sequentially can heat the first heating unit 51 of heating module 5 and this second heating unit 52 being installed on this first probe 31 inside, when Wheatstone bridge circuit is equilibrium state, be 43b/43a=43d/43c, resistance value does not change and so there is no electric current and flow through this control module 2, the flow velocity of the fluid 7 in the passage 61 of therefore this pipeline 6 is normal, represent that fluid 7 has proper flow.

When the first heating unit 51 of heating module 5 and the temperature of the second heating unit 52 heating remain in a standstill at this first probe 31, second probe 32, time near 3rd probe 33 and the 4th probe 34, this first probe 31, second probe 32, the resistance value of the first temperature sensing unit 43a ~ the 4th temperature sensing unit 43d in the 3rd probe 33 and the 4th probe 34 will change, again when the resistance value that this control module 2 senses the first temperature sensing unit 43a ~ the 4th temperature sensing unit 43d changes, can learn that the flow velocity of fluid 7 is slack-off or do not flow, because temperature and flow velocity are inversely.

Certainly; the utility model also can have other various embodiments; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the utility model, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the utility model.

Claims (8)

1. A thermal mass flowmeter, applied to a pipeline, the pipeline is provided with working fluid circulation, characterized in that the thermal mass flowmeter comprises: A housing with an accommodating space inside; a control module configured in the accommodating space; A plurality of probes are connected to one end of the casing, and each of the probes has an installation space communicated with the accommodation space; A flow calculation circuit, electrically connected to the control module, the flow calculation circuit is composed of a plurality of temperature sensing units installed in the installation space inside the probes; A heating module is electrically connected to one of the circuit boards and is electrically connected to the control module. 2. The thermal mass flowmeter according to claim 1, wherein the flow calculation circuit further comprises a plurality of circuit boards, the circuit boards are composed of a first circuit board and a second circuit board, the A plurality of temperature sensing units are composed of a first temperature sensing unit, a second temperature sensing unit, a third temperature sensing unit and a fourth temperature sensing unit, and the first temperature sensing unit is electrically connected to the first circuit board, the second temperature sensing unit, the third temperature sensing unit and the fourth temperature sensing unit are electrically connected to the second circuit board, and then the first circuit board and The second circuit board is electrically connected to form a Wheatstone bridge circuit and then electrically connected to the control module. 3. The thermal mass flowmeter according to claim 2, wherein the plurality of probes include a first probe and a second probe, and the first circuit board is installed on the first probe In the installation space of the second probe, the second circuit board is installed in the installation space of the second probe. 4. The thermal mass flowmeter according to claim 3, wherein the first temperature sensing unit, the second temperature sensing unit, the third temperature sensing unit and the fourth temperature sensing unit for the thermistor. 5. The thermal mass flowmeter according to claim 4, wherein the heating module is composed of a first heating unit and a second heating unit, the first heating unit and the second heating unit are electrically connected to the first circuit board and located on both sides of the first temperature sensing unit. 6. The thermal mass flowmeter according to claim 1, wherein the probes are composed of a first probe, a second probe, a third probe and a fourth probe. 7. The thermal mass flowmeter according to claim 6, wherein the flow calculation circuit further comprises a plurality of circuit boards, and the circuit boards are composed of a first circuit board, a second circuit board, a first Composed of three circuit boards and a fourth circuit board, the multiple temperature sensing units are composed of a first temperature sensing unit, a second temperature sensing unit, a third temperature sensing unit and a fourth temperature sensing unit The first temperature sensing unit is electrically fixed on the first circuit board, the second temperature sensing unit is electrically fixed on the second circuit board, and the third temperature sensing unit is electrically fixed on the third circuit board, the fourth temperature sensing unit is electrically fixed on the fourth circuit board, with the first circuit board, the second circuit board, the third circuit board and the first circuit board The four circuit boards are electrically connected to form a Wheatstone bridge circuit, and then electrically connected to the control module, and the first circuit board, the second circuit board, the third circuit board and the fourth circuit board are installed on the first circuit board. One probe, the second probe, the third probe and the fourth probe. 8. The thermal mass flowmeter according to claim 7, wherein the heating module is composed of a first heating unit and a second heating unit, the first heating unit and the second heating unit are electrically connected to the first circuit board and located on both sides of the first temperature sensing unit.