CN216349320U

CN216349320U - Pressure transmitting device

Info

Publication number: CN216349320U
Application number: CN202122874157.5U
Authority: CN
Inventors: 卢振宇; 吴森飚; 代文静
Original assignee: Guangzhou Zhujiang Natural Gas Power Generation Co ltd
Current assignee: Guangzhou Zhujiang Natural Gas Power Generation Co ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-04-19
Anticipated expiration: 2031-11-22

Abstract

The embodiment of the utility model relates to the field of pressure transmitters, in particular to a pressure transmitting device. The pressure transmitting device comprises a heat dissipation assembly, a drainage tube and a pressure transmitter. The radiating assembly comprises a plurality of radiating fins with through holes, and an air channel is formed between any two adjacent radiating fins; the first end of the draft tube is used for extending into the boiler to lead out high-temperature flue gas, and the draft tube comprises a winding section passing through the through hole; and the pressure transmitter is arranged on the drainage tube, is positioned at the downstream side of the heat dissipation assembly and is used for measuring the fluid pressure in the drainage tube. That is, this pressure transmitter has realized pressure transmitter can work under high temperature operating mode through drainage tube and radiator unit's structure.

Description

Pressure transmitting device

Technical Field

The embodiment of the utility model relates to the field of pressure transmitters, in particular to a pressure transmitting device.

Background

The pressure transmitter is a device which can convert physical pressure parameters of gas, liquid and the like sensed by the pressure transmitter of a load cell into standard electric signals to be supplied to secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like for measurement, indication and process regulation. The pressure transmitter is widely applied to various industrial automatic control environments, and relates to a plurality of industries such as water conservancy and hydropower, railway transportation, intelligent building, production automatic control, aerospace and the like.

The pressure transmitter can be divided into a general pressure transmitter (0.001 MPa-35 MPa) and a micro differential pressure transmitter (0-1.5 kPa) according to the pressure measuring range, and a negative pressure transmitter is adopted. The working principle of the common pressure transmitter is as follows: the measuring diaphragm and the electrodes on the insulating sheets on two sides form a capacitor respectively, when the pressures on two sides are inconsistent, the measuring diaphragm generates displacement, the displacement is in direct proportion to the pressure difference, so that the capacitances on two sides are unequal, and the measuring diaphragm and the electrodes on the insulating sheets on two sides pass through an oscillation and demodulation link.

The pressure transmitter is used as an electronic component, has strict requirements on the range of the ambient temperature of use, and usually has the medium temperature of-40-100 ℃ and the ambient temperature of-40-85 ℃, so the pressure transmitting and measuring device with the conventional structure cannot be applied to a high-temperature flue gas environment, such as a high-temperature (300-700 ℃) flue gas flow field in a power station boiler. On the other hand, internal circuit elements of the transmitter work in a high-temperature environment for a long time, heat dissipation and cooling cannot be carried out quickly and efficiently, and the service life of the transmitter can be shortened due to overlong service time.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pressure transmitting device for measuring the fluid pressure under the high-temperature working condition.

The utility model adopts a technical scheme that: a pressure transmitting device is provided, which comprises a heat dissipation assembly, a drainage tube and a pressure transmitter. The radiating assembly comprises a plurality of radiating fins with through holes, and an air channel is formed between any two adjacent radiating fins; the first end of the draft tube is used for extending into the boiler to lead out high-temperature flue gas, and the draft tube comprises a winding section passing through the through hole; and the pressure transmitter is arranged on the drainage tube, is positioned at the downstream side of the heat dissipation assembly and is used for measuring the fluid pressure in the drainage tube.

Optionally, the pressure transmitter is provided at the second end of the drain tube.

Optionally, the fins are arranged parallel to each other.

Optionally, the fins are arranged at equal intervals.

Optionally, the heat sink assembly further comprises a fan disposed on one side of the heat sink assembly for accelerating the air flow in the air channel.

Optionally, the plurality of fans are disposed on the same side of the heat dissipation assembly.

Optionally, the heat sink is planar, and the axis of the fan is parallel to the heat sink.

Optionally, the heat sink is welded to the serpentine segment.

Compared with the prior art, the pressure transmitting device provided by the embodiment of the utility model has the following beneficial effects:

the pressure transmitting device comprises a heat dissipation assembly, a drainage tube and a pressure transmitter. The radiating assembly comprises a plurality of radiating fins with through holes, and an air channel is formed between any two adjacent radiating fins; the first end of the draft tube is used for extending into the boiler to lead out high-temperature flue gas, and the draft tube comprises a winding section passing through the through hole; and the pressure transmitter is arranged on the drainage tube, is positioned at the downstream side of the heat dissipation assembly and is used for measuring the fluid pressure in the drainage tube.

The pressure transmitting device is suitable for a high-temperature environment, such as a heating furnace, the first end of the drainage tube extends into the heating furnace, gas in the heating furnace flows into the winding section, the heat dissipation assembly cools fluid in the tube, the fluid in the tube after cooling flows to the downstream side of the drainage tube, and the pressure transmitter measures the fluid pressure at the downstream side of the drainage tube. According to the Bernoulli distance, the pressure intensity of the fluid in the pipe is equal to the air pressure in the heating furnace, so the pressure intensity measured by the pressure transmitter is the air pressure in the heating furnace. That is, this pressure transmitter has realized pressure transmitter can work under high temperature operating mode through drainage tube and radiator unit's structure.

Drawings

To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly describe the embodiments. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic diagram of a pressure transmitter according to an embodiment of the present invention.

In the figure: 100. a heat dissipating component; 110. a heat sink; 120. a fan;

200. a drainage tube; 210. a first end; 220. a serpentine segment; 230. a second end;

300. a pressure transmitter.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. 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 also be present. 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 be present. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and the like as used herein are 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. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Furthermore, the technical features mentioned in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a schematic diagram of a pressure transmitter according to an embodiment of the present invention is shown, where the pressure transmitter includes a heat sink assembly 100, a drain 200, and a pressure transmitter 300. The heat dissipation assembly 100 includes a plurality of heat dissipation fins 110 having through holes, and an air channel is formed between any two adjacent heat dissipation fins 110; the first end 210 of the draft tube 200 is used for introducing high temperature flue gas into the boiler, and the draft tube 200 includes a serpentine section 220 passing through a through hole (not shown); and a pressure transmitter 300 installed on the drain tube 200 at a downstream side of the heat dissipation assembly 100, for measuring a fluid pressure inside the drain tube 200.

Pressure transmitter 300 is suitable for various complex operating conditions, but the problem of coping with under different operating conditions is inequality. Under the high-temperature working condition, the high temperature of the measured object easily causes the distortion of the measurement result of the pressure transmitter 300, and in addition, the high temperature also causes the fatigue damage of the measurement element of the pressure transmitter 300. The existing coping technical scheme is to carry out cooling operation on the pressure transmitter 300 which is being measured, the specific embodiment of the utility model develops a new method to carry out cooling treatment on the measured medium, according to the Bernoulli principle, the fluid pressure before and after cooling is not changed, and the measured fluid pressure after cooling is equal to the actual pressure under the high-temperature working condition. The specific principle is explained as follows:

according to the bernoulli principle:

p₁is the fluid pressure, v, at the first end 210 (i.e., inlet end) of the draft tube 200₁Is the flow rate of fluid into the first end 210, h₁Is the vertical height, p, of the first end 210₂Is the fluid pressure, v, of the point of interest of the draft tube 200 (which may be located at the second end 230 of the draft tube 200 or at any point downstream of the serpentine section 220 of the draft tube 200)₂Is the flow velocity of the fluid out of the point to be measured, h₂Is the vertical height of the point to be measured.

As long as ensureThe sectional area of the first end 210 of the drainage tube 200 is the same as that of the point to be measured, i.e. v can be ensured₁And v₂The same is true. Further according to h₁、h₂Height difference and measurement p₂Pressure value estimate p₁The pressure value of (1) is the actual pressure value of the fluid under the high-temperature condition.

Referring to fig. 1, in view of the heat dissipation assembly 100, from the viewpoint of more precise manufacturing process, a plurality of heat dissipation fins 110 are disposed in parallel, and preferably, the heat dissipation fins 110 are disposed at equal intervals. Of course, the heat dissipation fins 110 may be arranged in parallel in a curved shape. Or based on the angle of convenient installation, the radiating fin 110 is planar, and the through hole of the radiating fin 110 and the meandering section 220 of the drainage tube 200 are fixedly installed. The fixing mode can be selected from a tension tube and an interference fit mode. Based on the requirement of higher reliability, the drain tube 200 and the heat sink 110 are welded to the serpentine section 220 by a welding method. It is clear that a purely heat sink 110 may not be efficient in heat conduction, and it is preferable that a fan 120 is provided at one side of the heat sink assembly 100 for accelerating the air flow in the air channel. It is understood that a plurality of fans 120 may be provided to enhance the air cooling effect, and the plurality of fans 120 are all located on the same side of the heat sink assembly 100. In the case of the flat heat sink 110, the axis of the fan 120 is disposed parallel to the heat sink 110, contributing to efficient discharge of the hot air. It is understood that the heat dissipation assembly 100 may also employ more efficient heat exchange means such as water cooling.

With respect to draft tube 200, and with continued reference to FIG. 1, the draft end has a first end 210 and a second end 230 with a serpentine section 220 therebetween. In order to calculate the flow velocity of each section conveniently, the flow velocity measuring device can be formed by welding pipe sections with consistent apertures.

With respect to the pressure transmitter 300, please continue to refer to fig. 1, it is mounted on the drain tube 200 and located at the downstream side of the heat dissipation assembly 100 for measuring the fluid pressure in the drain tube 200. It should be noted that if any section of drain tube 200 has the same cross section, pressure transmitter 300 can be disposed at either second end 230 of drain tube 200 or at any point behind serpentine section 220, and the measured fluid pressure value will not change. It is understood that the pressure transmitter 300 may be additionally provided with a feedback device (not shown) for detecting the temperature of the fluid in the drain tube 200, the fan 120 is electrically connected to the pressure transmitter 300, and the pressure transmitter 300 is further used for adjusting the power of the fan 120 according to the temperature of the fluid in the drain tube 200.

It should be noted that the description of the present invention and the accompanying drawings illustrate preferred embodiments of the present invention, but the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present invention and to provide a more thorough understanding of the present disclosure. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention described in the specification; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the utility model as defined by the appended claims.

Claims

1. A pressure transmitting device, comprising:

the heat dissipation assembly comprises a plurality of heat dissipation fins with through holes, and an air channel is formed between any two adjacent heat dissipation fins;

the first end of the draft tube is used for extending into the boiler to lead out smoke, and the draft tube comprises a winding section penetrating through the through hole; and

and the pressure transmitter is arranged on the drainage tube, is positioned at the downstream side of the heat dissipation assembly and is used for measuring the fluid pressure in the drainage tube.

2. The pressure transmitter of claim 1, wherein the pressure transmitter is disposed at the second end of the draft tube.

3. A pressure transducer according to claim 1, wherein the fins are arranged parallel to each other.

4. A pressure transducer according to claim 2, wherein the fins are equally spaced.

5. The pressure transmitter of claim 1, further comprising a fan disposed on one side of the heat sink assembly for accelerating air flow within the air channel.

6. The pressure transmitter of claim 5, wherein the plurality of fans are disposed on the same side of the heat sink assembly.

7. A pressure transducer according to claim 5, wherein the heat sink is planar and the axis of the fan is parallel to the heat sink.

8. Pressure transducer according to any of claims 1-4, characterized in that the fins are welded to the meandering section.