CN213455675U

CN213455675U - Pressure compensation device for gas vortex flowmeter

Info

Publication number: CN213455675U
Application number: CN202022669096.4U
Authority: CN
Inventors: 孟繁喜
Original assignee: Zhonghuan TIG Co Ltd
Current assignee: Zhonghuan TIG Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-06-15
Anticipated expiration: 2030-11-18

Abstract

The utility model relates to a device for gas vortex flowmeter pressure compensation. The device comprises an annular condensing pipe component, a needle valve and a pressure sensor component which are welded on a pipeline, wherein the annular condensing pipe component is arranged at the lower end of the needle valve, and the pressure sensor component is arranged at the upper end of the needle valve; the utility model discloses can the lug weld on the pipeline, the design is compact, and the installation of being convenient for, dismantlement, change provide convenience for gas vortex flowmeter realizes that on-the-spot pressure compensation.

Description

Pressure compensation device for gas vortex flowmeter

Technical Field

The utility model relates to a gas measurement field, in particular to a device for gas vortex flowmeter pressure compensation.

Background

The volumetric flow rate of the gas varies with the process operating temperature and pressure due to the compressibility of the gas, the gas volume varying with temperature and pressure during the gas measurement. During the production process, the operating temperature and pressure are often changed, so that the volume flow under different operating conditions is not comparable. For this reason, in an actual production process, the volume flow under a design condition or the volume flow under a standard state (reference state) is often used for characterization. One of the functions of the temperature and pressure compensation of the gas flow measurement is to convert the volume flow in the operating state into the volume flow in the design state or the standard state. Because the flowmeter is designed and manufactured or calibrated according to the process conditions of the design state, when the operation working condition deviates from the design working condition, the flow measurement will generate deviation. Another effect of the temperature and pressure compensation of the gas volume flow is to correct measurement errors due to the deviation of the flowmeter operating conditions from the design process conditions.

At present, the pressure measurement on most flow pipelines is a pressure transmitter, an output signal is a two-wire system 4-20 mA current signal, the two-wire system is remotely transmitted to a flow integrating instrument, a PLC system or a user computer system matched with the pressure transmitter, and the current signal is converted into a pressure numerical value. The disadvantages of this measurement are:

1. the pressure compensation can only be matched with the pressure compensation of the gas vortex flowmeter, the field compensation can not be realized, and the inconvenience is brought to the field check of flow data.

2. The pressure compensation of the flow can be realized only by matching with a flow integrating instrument, a PLC system or a user computer system, and the use cost is increased.

3. A 24V power supply is required to be provided by a matched flow integrating instrument, a PLC system or a user computer system.

4. The pipeline needs to be punched and welded, which wastes manpower and material resources and adds a possible leakage point on the pipeline.

Disclosure of Invention

In view of the defects in the prior art, the invention provides a pressure compensation device for a gas vortex shedding flowmeter, which comprises an annular condenser pipe assembly, a needle valve and a pressure sensor part, and can be directly welded on a pipeline, wherein a pressure signal enters a transmitter head of the vortex shedding flowmeter through a cable, and can also be welded on a sensor shell of the vortex shedding flowmeter to form an integrated pressure compensation vortex shedding flowmeter. The design is compact, the installation, the disassembly and the replacement are convenient, and the convenience is provided for realizing the on-site pressure compensation of the gas vortex flowmeter.

The technical scheme of the invention is as follows: the utility model provides a device for gas vortex flowmeter pressure compensation which characterized in that: the device comprises an annular condensing pipe component, a needle valve and a pressure sensor component which are welded on a pipeline, wherein the annular condensing pipe component is arranged at the lower end of the needle valve, and the pressure sensor component is arranged at the upper end of the needle valve;

the annular condenser pipe assembly comprises an annular condenser pipe with a 90-degree bent pipe, a condenser pipe connecting pipe and a condenser pipe pressing screw, wherein the condenser pipe connecting pipe is arranged at a port of the annular condenser pipe, and the rotatable condenser pipe pressing screw is arranged outside the port of the condenser pipe connecting pipe;

the pressure sensor part comprises an all-welded pressure sensor, a heat-shrinkable sleeve, a warm-pressing sealing seat, a sealing plug and a cable; the all-welded pressure sensor comprises a pressure shell and a pressure sensor core, wherein the main body part of the pressure sensor core is sealed in the pressure shell, four signal wires are exposed, and external connecting threads are arranged at the lower end of the upper end of the pressure shell; the heat-shrinkable sleeve is sleeved on a signal wire of the all-welded pressure sensor, and the cable is connected with the signal wire; the warm-pressing sealing seat is arranged at the upper end of the pressure shell, and an O-shaped ring is arranged between the warm-pressing sealing seat and the pressure shell; the sealing plug is arranged at the upper end of the all-welded pressure sensor, and a sealing tube is arranged between the core of the pressure sensor and the sealing plug;

the lower end of the needle valve is arranged at the upper end of the condensing pipe compression screw, and the upper end of the needle valve is connected with the lower end of the pressure shell.

The utility model has the advantages that: the design is compact, and the installation, the disassembly and the replacement are convenient. The pressure sensor assembly outputs millivolt-level voltage signals, the millivolt-level voltage signals are received by a vortex flowmeter circuit matched with the pressure sensor assembly and converted into pressure values, the pressure values are displayed on a meter head of a vortex flowmeter transmitter and participate in flow compensation operation of the vortex flowmeter transmitter, and compensated instantaneous flow values and accumulated flow values are displayed on the meter head of the vortex flowmeter transmitter, so that convenience is further provided for realizing field pressure compensation of the gas vortex flowmeter.

Drawings

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

FIG. 2 is a right side view of the present invention;

FIG. 3 is a schematic view of the all-welded pressure sensor of the present invention;

fig. 4 is a schematic view of the all-welded pressure sensor component of the present invention.

Detailed Description

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the device for pressure compensation of the gas vortex flowmeter comprises an annular condenser pipe assembly 1, a needle valve 2 and a pressure sensor component 3 which are welded on a pipeline, wherein the annular condenser pipe assembly 1 is arranged at the lower end of the needle valve 2, and the pressure sensor component 3 is arranged at the upper end of the needle valve 2;

the annular condenser pipe component 1 comprises an annular condenser pipe 1-1 with a 90-degree bent pipe, a condenser pipe connecting pipe 1-2 and a condenser pipe compression screw 1-3, wherein the condenser pipe connecting pipe 1-2 is arranged at the port of the annular condenser pipe 1-1, and a rotatable condenser pipe compression screw 1-3 is arranged outside the port of the condenser pipe connecting pipe 1-2;

the pressure sensor part 3 comprises an all-welded pressure sensor 3-1, a heat-shrinkable sleeve 3-3, a warm-pressing sealing seat 3-4, a sealing plug 3-7 and a cable 3-8; the all-welded pressure sensor 3-1 comprises a pressure shell 3-1-1 and a pressure sensor core 3-1-2, wherein the main body part of the pressure sensor core 3-1-2 is sealed in the pressure shell 3-1-1, four signal wires 3-1-2-1 are exposed, and the upper end and the lower end of the pressure shell 3-1-1 are both provided with external connecting threads; a heat-shrinkable sleeve 3-3 is sleeved on a signal wire 3-1-2-1 of the all-welded pressure sensor 3-1, and a cable 3-8 is connected with the signal wire 3-1-2-1; the warm-pressing sealing seat 3-4 is arranged at the upper end of the pressure shell 3-1-1, and the O-shaped ring 3-2 is arranged between the warm-pressing sealing seat 3-4 and the pressure shell 3-1-1; the sealing plug (3-7) is arranged at the upper end of the all-welded pressure sensor 3-1, and a sealing tube 3-6 is arranged between the pressure sensor core 3-1-2 and the sealing plug (3-7);

the lower end of the needle valve 2 is arranged at the upper end of the condensing pipe compression screw 1-3, and the upper end is connected with the lower end of the pressure shell 3-1-1.

In order to ensure sealing, the joints of the upper end and the lower end of the needle valve 2 are provided with tetrafluoro sealing gaskets 5, and an O-shaped ring 3-2 is arranged between the warm-pressing sealing seat 3-4 and the pressure shell 3-1-1.

In order to ensure the locking effect and prevent the screw thread from loosening in the transportation process, set screws 4 are respectively arranged between the warm-pressing sealing seat 3-4 and the pressure shell 3-1-1 and between the needle valve 2 and the annular condensation pipe component 1.

In order to ensure safety, the warm-pressing sealing seats 3-4 are sealing elements with explosion-proof internal threads at the upper and lower parts; the sealing plugs 3-7 are sealing elements with explosion-proof external threads.

The pressure sensor component 3 is assembled as follows:

the first step is as follows: arranging a self-welding boss 3-1-1-1 at the upper end of the pressure shell 3-1-1, placing the main body part of the pressure sensor core 3-1-2 into the pressure shell 3-1-1, exposing the signal wire 3-1-2-1 outside, and welding and sealing the main body parts of the pressure shell 3-1-1 and the pressure sensor core 3-1-2 by the self-welding boss 3-1-1-1;

the second step is that: trimming four signal wires of the all-welded pressure sensor 3-1 to 15mm length, peeling off the head, plating tin, and respectively sleeving four 15mm length heat-shrinkable sleeves 3-3 on the four signal wires;

the third step: respectively and firmly welding the head peeling part of the cable 3-8, the tinning part and the four signal wires of the all-welded pressure sensor 3-1 in a one-to-one correspondence mode according to colors, and respectively moving the four heat-shrinkable sleeves 3-3 to welding spot positions for heating so as to enable the heat-shrinkable sleeves to shrink and seal the welding spots; at the moment, the distance from the upper end face of the all-welded pressure sensor 3-1 to the lower end of the unstripped cable of the cable 3-8 is not more than 30 mm;

the fourth step: installing the O-shaped ring 3-2 at the upper end of the 3-1-1, then placing the warm-pressing sealing seat 3-4, and screwing the outer connecting thread of the pressure shell 3-1-1 and the inner connecting thread of the warm-pressing sealing seat 3-4;

the fifth step: and sequentially assembling 3-5 parts of a metal sealing washer, 3-6 parts of a sealing pipe, 3-5 parts of the metal sealing washer and 3-7 parts of a sealing plug on the warm pressing sealing seat 3-4, and finally screwing the sealing plug 3-7 to enable the sealing pipe 3-6 to tightly wrap the cable 3-8.

When in use, the device works in the following modes: after the annular condenser pipe component 1 is welded on a shell of a vortex street flowmeter, the vortex street flowmeter is installed on a gas pipeline, the pressure of gas flowing in the pipeline is transmitted to a full-welding pressure sensor 3-1 through the condenser pipe component 1 and a needle valve 2, the full-welding pressure sensor 3-1 receives a pressure signal and converts the pressure signal into a millivolt-level voltage signal, the millivolt-level voltage signal is transmitted to a matched vortex street flowmeter circuit board through a cable 3-8, the vortex street flowmeter circuit board receives, arranges and converts the pressure value into a pressure value which is displayed in a liquid crystal panel of a vortex street flowmeter transmitter, meanwhile, the pressure value also participates in the calculation of a circuit flow value, the pressure compensation is carried out on the gas flow, and the working condition flow is converted into a standard flow or a mass flow.

Claims

1. The utility model provides a device for gas vortex flowmeter pressure compensation which characterized in that: the device comprises an annular condensation pipe component (1), a needle valve (2) and a pressure sensor component (3), wherein the annular condensation pipe component (1) is welded on a pipeline, the lower end of the needle valve (2) is provided with the annular condensation pipe component (1), and the upper end of the needle valve is provided with the pressure sensor component (3);

the annular condenser pipe assembly (1) comprises an annular condenser pipe (1-1) with a 90-degree bent pipe, a condenser pipe connecting pipe (1-2) and a condenser pipe pressing screw (1-3), the condenser pipe connecting pipe (1-2) is arranged at the port of the annular condenser pipe (1-1), and the rotatable condenser pipe pressing screw (1-3) is arranged outside the port of the condenser pipe connecting pipe (1-2);

the pressure sensor part (3) comprises an all-welded pressure sensor (3-1), a heat-shrinkable sleeve (3-3), a warm-pressing sealing seat (3-4), a sealing plug (3-7) and a cable (3-8); the all-welded pressure sensor (3-1) comprises a pressure shell (3-1-1) and a pressure sensor core (3-1-2), wherein the main body part of the pressure sensor core (3-1-2) is sealed in the pressure shell (3-1-1), four signal wires (3-1-2-1) are exposed, and the upper end and the lower end of the pressure shell (3-1-1) are provided with external connecting threads; the heat-shrinkable sleeve (3-3) is sleeved on a signal wire (3-1-2-1) of the all-welded pressure sensor (3-1), and the cable (3-8) is connected with the signal wire (3-1-2-1); the warm-pressing sealing seat (3-4) is arranged at the upper end of the pressure shell (3-1-1), and an O-shaped ring (3-2) is arranged between the warm-pressing sealing seat (3-4) and the pressure shell (3-1-1); the sealing plug (3-7) is arranged at the upper end of the all-welded pressure sensor (3-1), and a sealing tube (3-6) is arranged between the pressure sensor core (3-1-2) and the sealing plug (3-7);

the lower end of the needle valve (2) is arranged at the upper end of a condenser pipe compression screw (1-3), and the upper end is connected with the lower end of the pressure shell (3-1-1).

2. The apparatus of claim 1 for pressure compensation of a gas vortex shedding flowmeter, wherein: the joint of the upper end and the lower end of the needle valve (2) is provided with a tetrafluoro sealing gasket (5), and an O-shaped ring (3-2) is arranged between the warm-pressing sealing seat (3-4) and the pressure shell (3-1-1).

3. The apparatus of claim 1 for pressure compensation of a gas vortex shedding flowmeter, wherein: set screws (4) are respectively arranged between the warm-pressing sealing seat (3-4) and the pressure shell (3-1-1) and between the needle valve (2) and the annular condensing pipe assembly (1).

4. The apparatus of claim 1 for pressure compensation of a gas vortex shedding flowmeter, wherein: the warm-pressing sealing seats (3-4) are sealing pieces with explosion-proof internal threads at the upper and lower parts; the sealing plug (3-7) is a sealing element with an explosion-proof external thread.