CN213481420U

CN213481420U - Differential pressure flowmeter

Info

Publication number: CN213481420U
Application number: CN202022597639.6U
Authority: CN
Inventors: 庞宝新
Original assignee: Shanghai Keyontechs Co Ltd
Current assignee: Shanghai Keyontechs Co Ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-06-18
Anticipated expiration: 2030-11-11

Abstract

The utility model relates to the technical field of measurement, in particular to a differential pressure type flowmeter, which comprises a throttle plate and a temperature measuring instrument, wherein the surface of the throttle plate is provided with a throttle through hole, the side surface of the throttle plate is provided with a blind hole along the direction parallel to the surface, and the throttle through hole is not intersected with the blind hole; the temperature measuring instrument comprises a temperature sensor, and a temperature measuring part of the temperature sensor can be inserted into the blind hole. The temperature measuring point of the temperature sensor of the differential pressure type flowmeter is arranged in the throttle plate, the fluid passing through the throttle through hole is not influenced, so that the flow measurement is not influenced, the temperature of the throttle plate is measured to be used as the reference temperature for calculating the temperature difference compensation, the measuring result is closer to the temperature of the fluid passing through the throttle through hole, and the accuracy of the temperature difference compensation is ensured.

Description

Differential pressure flowmeter

Technical Field

The utility model relates to a measure technical field, especially relate to a differential pressure type flowmeter.

Background

The differential pressure type flowmeter is most widely applied to electric power and chemical engineering occasions, and temperature measurement is usually needed in the using process to compensate the temperature and the pressure of flow. The temperature measuring instrument is generally installed at a position beyond the downstream 5D (equivalent to the length of 5 pipe diameters) of the throttling element, the flow measurement is influenced when the position is too close, and the temperature measurement has deviation due to reasons such as heat dissipation of a pipeline and the like when the position is too far.

Therefore, a differential pressure flowmeter is needed to solve the problem that temperature measurement affects flow measurement or temperature and pressure compensation has errors.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a differential pressure type flowmeter.

To achieve the purpose, the utility model adopts the following technical proposal:

a differential pressure flowmeter comprising:

the throttle plate is provided with a throttle through hole, the side surface of the throttle plate is provided with a blind hole along the radial direction, and the throttle through hole is not communicated with the blind hole;

the temperature measuring instrument comprises a temperature sensor, and a temperature measuring part of the temperature sensor can be inserted into the blind hole.

Optionally, the temperature measuring instrument further comprises a temperature sensor protection extension pipe, and the temperature sensor protection extension pipe is sleeved on the non-temperature measuring part of the temperature sensor.

Optionally, the temperature measuring instrument further comprises an electronic housing, a cavity is arranged inside the electronic housing, and the non-temperature measuring end of the temperature sensor is inserted into the cavity.

Optionally, a connection terminal is arranged in the electronic housing, and the connection terminal is electrically connected with the temperature sensor and the cable respectively.

Optionally, a connector is formed on the electronic housing, and the cable can be inserted through the connector to connect with an external instrument.

Optionally, the temperature sensor protection extension pipe is detachably connected with the blind hole in a sealing manner.

Optionally, the temperature sensor protection extension tube is detachably and hermetically connected with the electronic housing.

Optionally, the temperature sensor protects that one end of the extension pipe away from the throttle plate is detachably and hermetically connected with the temperature sensor.

Optionally, two pressure measuring flanges are respectively arranged on two sides of the throttle plate, the throttle plate is hermetically connected with the pressure measuring flanges, and the pressure measuring flanges are used for connecting a differential pressure transmitter.

Optionally, the throttle plate is made of a heat conducting material.

The utility model has the advantages that:

the utility model provides a differential pressure flowmeter, which comprises a throttle plate and a temperature measuring instrument, wherein the surface of the throttle plate is provided with a throttle through hole, the side surface of the throttle plate is provided with a blind hole along the direction parallel to the surface of the throttle plate, and the throttle through hole and the blind hole are not intersected; the temperature measuring instrument comprises a temperature sensor, and a temperature measuring part of the temperature sensor can be inserted into the blind hole. The temperature measuring point of the temperature sensor of the differential pressure type flowmeter is arranged in the throttle plate, the fluid passing through the throttle through hole is not influenced, so that the flow measurement is not influenced, the temperature of the throttle plate is measured to be used as the reference temperature for calculating the temperature difference compensation, the measuring result is closer to the temperature of the fluid passing through the throttle through hole, and the accuracy of the temperature difference compensation is ensured.

Drawings

Fig. 1 is a front view of a differential pressure flowmeter according to an embodiment of the present invention;

fig. 2 is a left side view of a differential pressure flowmeter provided by an embodiment of the present invention;

fig. 3 is a front view of a partial structure of a differential pressure flowmeter according to an embodiment of the present invention;

fig. 4 is a right side view of a partial structure of a differential pressure type flowmeter according to an embodiment of the present invention;

fig. 5 is a cross-sectional view taken along a-a of fig. 4.

In the figure:

1. a throttle plate; 11. a throttle bore; 12. blind holes;

2. a temperature measuring instrument; 21. a temperature sensor; 22. the temperature sensor protects the extension tube; 23. an electronics housing; 231. a connecting port;

3. a pressure measuring flange;

4. a pipe section.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 5, the present embodiment provides a differential pressure type flowmeter including a throttle plate 1, a temperature measuring instrument 2, and a pressure-taking flange 3. The temperature measuring instrument 2 is detachably and hermetically connected with the throttle plate 1 along the radial direction of the throttle plate 1, and the pressure measuring flange 3 is fixedly connected with the throttle plate 1 along the axial direction of the throttle plate 1.

The throttle plate 1 is provided with a throttle through hole 11 along the axial direction on the plate surface, a blind hole 12 is arranged on the side surface of the throttle plate 1 along the radial direction, and the throttle through hole 11 is not communicated with the blind hole 12. The temperature measuring instrument 2 includes a temperature sensor 21, and a temperature measuring portion of the temperature sensor 21 is insertable into the blind hole 12 to measure the temperature in the blind hole 12. After the fluid flows through the throttle through hole 11 for a period of time along the axial direction of the throttle plate 1, the temperature of the throttle plate 1 can be regarded as the temperature of the fluid, so that the temperature of the blind hole 12 is measured by the temperature sensor 21, and the temperature and the pressure compensation can be calculated.

Compared with the prior art, the temperature measuring point of the temperature sensor 21 of the differential pressure type flowmeter provided by the embodiment is arranged in the throttle plate 1, so that the fluid passing through the throttle through hole 11 is not influenced, the temperature measurement is not influenced on the flow measurement, the temperature of the throttle plate 1 is measured as the reference temperature for calculating the temperature difference compensation, the measurement result is closer to the temperature of the fluid passing through the throttle through hole 11, and the accuracy of the temperature difference compensation is ensured.

Optionally, in order to protect the temperature sensor 21 and isolate the influence of the external environment on the temperature measurement result of the temperature sensor 21, the temperature measurement instrument 2 further includes a temperature sensor protection extension tube 22, and the temperature sensor protection extension tube 22 is sleeved on the non-temperature measurement portion of the temperature sensor 21.

Optionally, a thread is arranged on the outer side surface of one end, close to the temperature measuring part, of the temperature sensor protection extension pipe 22, a thread is correspondingly arranged on the inner wall of one end, away from the throttling through hole 11, of the blind hole 12 of the throttle plate 1, and the temperature sensor protection extension pipe 22 can be detachably and hermetically connected with the blind hole 12 of the throttle plate 1 through the thread. The arrangement ensures that external media cannot enter the blind hole 12 from a gap between the sleeve and the blind hole 12, thereby eliminating the influence of the external media on the internal temperature of the blind hole 12, ensuring the accuracy of temperature measurement of the temperature sensor 21, and being convenient for maintenance and replacement of elements by detachable connection.

Optionally, a thread is provided on an inner wall surface of one end of the temperature sensor protection extension pipe 22, which is far away from the throttle plate 1, and a thread is correspondingly provided on an outer wall surface of one end of the temperature sensor 21, which is far away from the temperature measurement end, and the temperature sensor protection extension pipe 22 and the temperature sensor 21 can be detachably and hermetically connected through the thread. The arrangement fixes the relative position of the temperature sensor 21 and the blind hole 12, ensures the stability of the measuring process, and the detachable connection is convenient for maintaining and replacing elements.

Optionally, the throttle plate 1 is made of a thermally conductive material to ensure that the temperature inside the blind bore 12 is the same as the temperature of the fluid passing through the throttle bore.

In order to protect the non-thermometric end of the temperature sensor 21 and to assist in transmitting the electrical signal, optionally, the temperature measuring instrument 2 further comprises an electronic housing 23, a cavity being provided inside the electronic housing 23, the temperature sensor protecting one end of the extension tube 22 and the non-thermometric end of the temperature sensor 21 probing into the cavity. Optionally, a thread is provided on an inner wall surface of a connection portion of the cavity and the temperature sensor protection extension tube 22, a thread is correspondingly provided on an outer wall surface of one end of the temperature sensor protection extension tube 22, which extends into the cavity, and the temperature sensor protection extension tube 22 and the electronic housing 23 are detachably and hermetically connected through the thread. The arrangement ensures that external media cannot enter the cavity from the gap at the joint of the temperature sensor protection extension pipe 22 and the electronic shell 23, the inside of the cavity is protected from being influenced by the external environment, and the detachable connection is convenient for maintaining and replacing elements.

Optionally, a connection terminal is disposed in a cavity of the electronic housing 23, the connection terminal is electrically connected to the temperature sensor 21 and the cable, a connection port 231 is disposed on the electronic housing 23, one end of the connection port 231 is communicated with the cavity, and the cable can penetrate through the connection port 231 and be connected to an external device, so that the temperature sensor 21 is electrically connected to the external device.

Optionally, in order to measure the pressure difference, two pressure-taking flanges 3 are respectively arranged on two sides of the throttle plate 1, the two pressure-taking flanges 3 are fixedly connected through bolts which are uniformly distributed in the circumferential direction, sealing gaskets are respectively arranged between the throttle plate 1 and the two pressure-taking flanges 3, and the two pressure-taking flanges 3 are compressed through the bolts, so that the pressure-taking flanges 3 and the throttle plate 1 can be compressed, and thus the pressure-taking flanges 3 and the throttle plate 1 are in sealed connection. The inner diameter of the circumference formed by the bolts is matched with the outer diameter of the plate surface of the throttle plate 1, so that the throttle plate 1 cannot move along the radial direction, and the throttle plate is fixedly connected with the pressure taking flange 3. The pressure taking flange 3 is used for connecting a differential pressure transmitter to realize pressure taking and measurement of fluid.

Optionally, for convenience of measurement, as shown in fig. 1, pipe sections 4 are further provided on sides of the two pressure measuring flanges away from the throttle plate, and the pipe sections 4 are welded to the pressure measuring flanges.

The working principle of the differential pressure type flowmeter is as follows: the fluid to be measured flows into the pipe section 4 on one side, flows through the pressure taking flange on the one side, is reduced in pressure through the throttle plate, flows through the pressure taking flange on the other side, and finally flows out of the pipe section 4 on the other side. And respectively measuring the front and rear fluid pressures, and combining the temperatures measured by the temperature sensors to obtain temperature and pressure compensation so as to obtain a flow result of the fluid.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A differential pressure flowmeter, comprising:

the throttle plate (1), wherein a throttle through hole (11) is arranged on the throttle plate (1), a blind hole (12) is arranged on the side surface of the throttle plate (1) along the radial direction, and the throttle through hole (11) is not communicated with the blind hole (12);

the temperature measuring instrument (2) comprises a temperature sensor (21), and a temperature measuring part of the temperature sensor (21) can be inserted into the blind hole (12).

2. The differential pressure flowmeter of claim 1, wherein the temperature measuring instrument (2) further comprises a temperature sensor protection extension tube (22), and the temperature sensor protection extension tube (22) is fitted over a non-temperature measuring portion of the temperature sensor (21).

3. The differential pressure flowmeter according to claim 2, wherein the temperature measuring instrument (2) further comprises an electronic housing (23), a cavity is arranged inside the electronic housing (23), and the non-temperature measuring end of the temperature sensor (21) is inserted into the cavity.

4. A differential pressure flowmeter according to claim 3, wherein connection terminals are provided in the electronic housing (23), said connection terminals being electrically connected to the temperature sensor (21) and a cable, respectively.

5. The differential pressure flowmeter according to claim 4, wherein the electronic casing (23) is provided with a connection port (231), and the cable can be connected to an external instrument through the connection port (231).

6. A differential pressure flowmeter according to any one of claims 2-5, wherein the temperature sensor protection extension tube (22) is in detachable sealing connection with the blind hole (12).

7. A differential pressure flowmeter according to any of claims 3-5, wherein the temperature sensor protection extension tube (22) is removably and sealingly connected to the electronics housing (23).

8. The differential pressure flowmeter according to claim 6, wherein the temperature sensor protection extension pipe (22) is detachably and hermetically connected to the temperature sensor (21) at an end thereof remote from the throttle plate (1).

9. A differential pressure flowmeter according to any one of claims 1-5, wherein a pressure tapping flange (3) is arranged on each side of the throttle plate (1), the throttle plate (1) is sealingly connected to the pressure tapping flange (3), and the pressure tapping flange (3) is used for connecting a differential pressure transmitter.

10. A differential pressure flowmeter according to any one of claims 2-5, wherein the throttle plate (1) is of a thermally conductive material.