CN209927206U - High-precision thermal flowmeter - Google Patents
High-precision thermal flowmeter Download PDFInfo
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- CN209927206U CN209927206U CN201921011372.9U CN201921011372U CN209927206U CN 209927206 U CN209927206 U CN 209927206U CN 201921011372 U CN201921011372 U CN 201921011372U CN 209927206 U CN209927206 U CN 209927206U
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Abstract
High accuracy thermal flowmeter, including the flowmeter tube socket, be equipped with wide shoulder hole down narrow in the flowmeter tube socket, the flowmeter instrument sets gradually from top to bottom in the shoulder hole, the instrument stay tube, the flange, temperature sensor and flow rate sensor, gauge outfit stay tube overcoat has the housing screw who passes through threaded connection and compress tightly the flange with the flowmeter tube socket, the flange is outer from bottom to top to cover and detains thermal-insulated heat exchanger, the shoulder hole lower part sets up and welds and cover flange center hole in its thermal-insulated plug socket with the flange bottom surface, thermal-insulated plug socket is inserted to thermal-insulated plug socket lower part, set up the sealing washer between thermal-insulated plug socket and the thermal-insulated plug socket, be equipped with two vertical sensor jacks on the thermal-insulated plug socket, temperature sensor, flow rate sensor cartridge is in the sensor jack that corresponds, the lead wire. The influence of external temperature on the precision of the sensor can be greatly reduced, so that the thermal flowmeter accurately measures the medium flow in the conduction tube, and the measurement deviation is reduced.
Description
Technical Field
The utility model relates to a thermal type flowmeter especially relates to a high accuracy thermal type flowmeter.
Background
The thermal flowmeter adopts a thermal diffusion principle, when two sensors of the thermal flowmeter are arranged in a medium in a conducting pipe, one flow velocity sensor is heated to a temperature above the ambient temperature, and the other temperature sensor is used for sensing the temperature of the medium. (1) Constant power thermal flowmeter: the flow velocity of the medium is increased, the heat quantity taken away by the medium is increased, the temperature difference of the two sensors changes along with the change of the flow velocity of the medium, and the functional relation between the temperature difference and the flow velocity of the medium is the instantaneous flow velocity (flow) of the medium. (2) Constant temperature differential thermal flow meter: the function of the change in flow rate, the amount of change in power of the flow rate sensor, is the instantaneous flow rate (flow) of the medium.
The existing thermal flowmeter mainly comprises a flowmeter tube seat and a conduction tube, wherein a stepped hole with a wide upper part and a narrow lower part is arranged in the flowmeter tube seat, and a flowmeter, an instrument supporting tube, a flange, a temperature sensor and a flow velocity sensor are sequentially arranged in the stepped hole from top to bottom. The temperature sensor and the flow velocity sensor in the thermal flowmeter are directly mounted at the bottom of the flange, the flange is in direct contact with the flowmeter tube seat, and the external temperature is transmitted to the temperature sensor and the flow velocity sensor through the flowmeter tube seat and the flange in sequence, so that the temperature sensed by the temperature sensor and the flow velocity sensor is different from the temperature of a medium in a conduction tube, and the medium flow in the conduction tube measured by the thermal flowmeter is inaccurate and has deviation.
Disclosure of Invention
The utility model relates to a solve above-mentioned technical problem, provide a high accuracy thermal type flowmeter, its reduction ambient temperature that can be great influences the precision of sensor for the accurate interior medium flow that switches on that records of thermal type flowmeter reduces the measurement deviation.
The technical solution of the utility model is that:
high accuracy thermal type flowmeter, including the flowmeter tube socket, be equipped with narrow shoulder hole under wide in the flowmeter tube socket, set gradually flowmeter instrument, instrument stay tube, flange, temperature sensor and velocity of flow sensor from top to bottom in the shoulder hole, the cover has the housing screw who just compresses tightly the flange through threaded connection with the flowmeter tube socket at gauge outfit stay tube overcoat, its special character lies in: the flange is externally provided with a heat insulation cover from bottom to top, the lower part of the stepped hole is provided with a heat insulation inserting seat socket which is welded with the bottom surface of the flange and covers the central hole of the flange in the flange, the lower part of the heat insulation inserting seat socket is inserted into the heat insulation inserting seat, a sealing ring is arranged between the heat insulation inserting seat and the heat insulation inserting seat socket, two vertical sensor inserting holes are arranged on the heat insulation inserting seat, the temperature sensor and the flow velocity sensor are inserted into the corresponding sensor inserting holes, and lead wires of the sensors sequentially penetrate through the flange and the instrument supporting tube to be connected with the measuring instrument.
Further preferably, a first sealing groove is formed in the circumferential outer wall of the heat insulation inserting seat, and the sealing ring is clamped in the first sealing groove.
Further preferably, an adhesive is applied in the first sealing groove.
Preferably, a second sealing groove is formed in the hole wall of the sensor jack, and an adhesive is coated in the second sealing groove.
Further preferably, the heat shield is made of polytetrafluoroethylene.
More preferably, the heat insulation socket is made of materials such as phenolic resin, nylon, polyether ether ketone, polyimide and the like.
The utility model has the advantages that:
because the flange that sets up separates heat exchanger and thermal-insulated bayonet socket, effectively kept apart heat-conduction between external temperature and temperature sensor and the velocity of flow sensor, effectively reduced ambient temperature to temperature sensor's influence for the medium velocity of flow (flow) in the conduction-tube is measured to thermal type flowmeter precision, has reduced the measurement deviation.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1:
FIG. 3 is a schematic structural view of the installation and use state of the present invention;
in the figure: the method comprises the following steps of 1-a flowmeter instrument, 2-an instrument supporting tube, 3-a compression screw, 4-a sensor tube seat, 5-a flange, 6-a heat insulation cover, 7-a heat insulation socket, 8-a limit baffle, 9-a sealing ring, 10-a heat insulation socket, 11-an adhesive, 12-a temperature sensor, 13-a flow velocity sensor and 14-a conduction tube.
Detailed Description
As shown in fig. 1 and 2, the high-precision thermal flowmeter comprises a sensor tube seat 4, a stepped hole with a wide top and a narrow bottom is arranged in the sensor tube seat 4, a flowmeter instrument 1, an instrument support tube 2, a compression screw 3 and a flange 5 are sequentially arranged in the stepped hole from top to bottom, a heat insulation cover 6 is covered outside the flange 5 from bottom to top, the compression screw 3 is sleeved outside the instrument support tube 2, the compression screw 3 is connected with the inner wall of the sensor tube seat 4 through a thread and compresses the flange 5 and the heat insulation cover 6 onto the sensor tube seat 4, a heat insulation socket 7 welded with the flange 5 and covering the central hole of the flange 5 is arranged at the lower part of the stepped hole, a heat insulation socket 10 made of phenolic resin is inserted at the lower part of the heat insulation socket 7, a first sealing groove is arranged on the outer wall of the circumference of the heat insulation socket 10, a sealing ring 9 is arranged in the first sealing, be equipped with two vertical sensor jacks on thermal-insulated bayonet socket 10, insert corresponding temperature sensor 12 and velocity of flow sensor 13 in two sensor jacks, be equipped with the second seal groove at the pore wall of sensor jack, coating binder 11 in the second seal groove, be equipped with limit baffle 8 in thermal-insulated bayonet socket 7, be equipped with the through wires hole that corresponds with temperature sensor 12 and velocity of flow sensor 13 on the limit baffle 8, thermal-insulated bayonet socket 10 top is leaned on in limit baffle 8 bottom surface, and temperature sensor 12 and velocity of flow sensor 13's lead wire passes limit baffle 8, flange 5, instrument support tube 2 in proper order and is connected with flowmeter instrument 1.
As shown in fig. 3, the working principle of the present invention is:
constant power thermal flowmeter
The sensor tube seat 4 of the high-precision thermal flowmeter is welded at a flowmeter mounting opening on the wall of a conduction tube 14, the temperature difference between a temperature sensor 12 and a flow velocity sensor 13 changes along with the change of the flow velocity of a medium in the circulation process of the medium in the conduction tube 14, and the instantaneous flow velocity (flow) of the medium is calculated through an instrument according to the functional relation between the temperature difference and the flow velocity of the medium.
Constant temperature differential thermal flowmeter
The sensor tube seat 4 of the high-precision thermal flowmeter is welded at the tube wall flowmeter mounting opening of the conduction tube, in the medium circulation process in the conduction tube, the power of the flow velocity sensor 13 changes along with the change of the flow velocity of the medium, and the instantaneous flow velocity (flow) of the medium is calculated through the meter according to the functional relation between the power difference and the medium flow velocity.
The above description is only an example of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. High accuracy thermal type flowmeter, including the flowmeter tube socket, be equipped with narrow shoulder hole under wide in the flowmeter tube socket, set gradually flowmeter instrument, instrument stay tube, flange, temperature sensor and velocity of flow sensor from top to bottom in the shoulder hole, the cover has the housing screw who passes through threaded connection and compress tightly the flange with the flowmeter tube socket at gauge outfit stay tube overcoat, its characterized in that: the flange is externally provided with a heat insulation cover from bottom to top, the lower part of the stepped hole is provided with a heat insulation inserting seat socket which is welded with the bottom surface of the flange and covers the central hole of the flange in the flange, the lower part of the heat insulation inserting seat socket is inserted into the heat insulation inserting seat, a sealing ring is arranged between the heat insulation inserting seat and the heat insulation inserting seat socket, two vertical sensor inserting holes are arranged on the heat insulation inserting seat, the temperature sensor and the flow velocity sensor are inserted into the corresponding sensor inserting holes, and lead wires of the sensors sequentially penetrate through the flange and the instrument supporting tube to be connected with the measuring instrument.
2. The high accuracy thermal flow meter according to claim 1, characterized in that: the outer wall of the circumference of the heat insulation inserting seat is provided with a first sealing groove, and the sealing ring is clamped in the first sealing groove.
3. The high accuracy thermal flow meter according to claim 2, characterized in that: an adhesive is applied within the first seal groove.
4. The high accuracy thermal flow meter according to claim 1, characterized in that: and a second sealing groove is formed in the hole wall of the sensor jack, and a bonding agent is coated in the second sealing groove.
5. The high accuracy thermal flow meter according to claim 1, characterized in that: the heat shield is made of polytetrafluoroethylene.
6. The high accuracy thermal flow meter according to claim 1, characterized in that: the heat insulation socket is made of phenolic resin, nylon, polyether-ether-ketone or polyimide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921011372.9U CN209927206U (en) | 2019-07-02 | 2019-07-02 | High-precision thermal flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921011372.9U CN209927206U (en) | 2019-07-02 | 2019-07-02 | High-precision thermal flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209927206U true CN209927206U (en) | 2020-01-10 |
Family
ID=69093430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921011372.9U Active CN209927206U (en) | 2019-07-02 | 2019-07-02 | High-precision thermal flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209927206U (en) |
-
2019
- 2019-07-02 CN CN201921011372.9U patent/CN209927206U/en active Active
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