Double-diaphragm differential pressure measuring device

Abstract

The utility model discloses a double-diaphragm differential pressure measuring device which comprises a first-stage diaphragm body, two sides of the first-stage diaphragm body are respectively provided with a high-pressure end chamber and a low-pressure end chamber, and two side portions of the first-stage diaphragm body are respectively provided with a second-stage diaphragm body. The high-pressure end chamber and the low-pressure end chamber of the first-stage diaphragm body are respectively connected with the second-stage diaphragm body adjacent to the first-stage diaphragm body in a sealed mode, the two-stage diaphragm chambers of the first-stage diaphragm body and the second-stage diaphragm body are arranged, the second-stage diaphragm body is in direct contact with high-temperature media, and due to the fact that the diaphragm is resistant to high temperature, the service life is long.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of instrument and meter, concretely relates to a double diaphragm differential pressure measuring device. BACKGROUND

[0002] The differential pressure measuring device in general sense is measured by being installed on the pipeline through flange connection, and the pressure value is transmitted to the transmitter through the positive and negative chambers on the two flanges. If it is in the high-pressure pipeline, high-pressure flange is used for measurement for safe production, and the volume is usually large. It is inconvenient to install in many special cases. In addition, the temperature of some medium in the pipeline is very high, but the environmental temperature is very low, and in this case, the measurement is often inaccurate. SUMMARY

[0003] In order to solve the above technical problems, the utility model aims at providing a double diaphragm differential pressure measuring device which can be used at low environmental temperature and measure high-temperature medium.

[0004] In order to achieve the above purpose, the technical scheme of the utility model is as follows: a double diaphragm differential pressure measuring device comprises a first diaphragm body, the high-pressure end chamber and the low-pressure end chamber are arranged on the two sides of the first diaphragm body respectively, the second diaphragm body is arranged on the two sides of the first diaphragm body respectively, and the high-pressure end chamber and the low-pressure end chamber of the first diaphragm body are sealingly connected with the second diaphragm body on the adjacent side.

[0005] Preferably, the high-pressure end chamber and the low-pressure end chamber are filled with first filling liquid, and the measurement accuracy temperature of the first filling liquid is-40 DEG C to 200 DEG C.

[0006] Preferably, the second diaphragm body has a second chamber, the second chamber is filled with first filling liquid, and the measurement accuracy temperature of the first filling liquid is 10 DEG C to 600 DEG C.

[0007] Preferably, the second diaphragm body is provided with a mounting clamp, and a red copper gasket is arranged between the mounting clamp and the second diaphragm body.

[0008] Further preferably, the mounting clamp is provided with a through hole connected with the second diaphragm body.

[0009] Further preferably, the first diaphragm body and the second diaphragm body are pressed and sealed by the mounting clamp, the fixing bolt and the fixing nut.

[0010] Preferably, two capillary tubes are further included, and the two capillary tubes are respectively connected with the high-pressure end chamber and the low-pressure end chamber.

[0011] Further preferably, a protection hose is further included, and the protection hose is arranged outside the two capillary tubes.

[0012] Further preferably, the wall of the protection hose is provided with wavy curved lines.

[0013] Further preferably, a protection handle is fixedly connected to the first-stage diaphragm body, and the protection hose is arranged in the protection handle.

[0014] The utility model has the advantages of:

[0015] 1. The utility model has two-stage diaphragm chambers of a first-stage diaphragm body and a second-stage diaphragm body, and the second-stage diaphragm body directly contacts high-temperature medium, so long service life is achieved due to the high-temperature resistance of the diaphragm.

[0016] 2. The first-stage diaphragm body is connected with a capillary tube and a transmitter, and good performance is achieved in a low-temperature environment.

[0017] 3. The utility model has small diaphragm volume, high precision, and convenient installation of the clamping plate, and good performance is achieved in special working conditions, and the hole distance on the clamping plate can be directly matched with a standard three-valve group, so that subsequent pipe connection, pressure maintaining and pressure releasing are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of not paying creative labor.

[0019] The utility model will be further described in combination with the drawings and embodiments as follows:

[0020] Fig. 1 It is a decomposition schematic view of the utility model;

[0021] Fig. 2 It is a sectional view schematic view of the utility model.

[0022] Wherein: 1, first-stage diaphragm body, 2, second-stage diaphragm body, 3, red copper gasket, 4, installation clamping plate, 5, fixed nut, 6, protection handle, 7, protection hose, 8, capillary tube, 9, fixed bolt 9. PREFERRED EMBODIMENT

[0023] Referring to the drawings, Figs. 1-2 As shown in the drawings, a double-diaphragm differential pressure measuring device includes a first-stage diaphragm body, the first-stage diaphragm body 1 has a high-pressure end chamber and a low-pressure end chamber on both sides, respectively, and the first-stage diaphragm body 1 is provided with a second-stage diaphragm body 2 on both sides, respectively, and the high-pressure end chamber and the low-pressure end chamber of the first-stage diaphragm body are sealingly connected with the second-stage diaphragm body 2 on the adjacent side, respectively.

[0024] The embodiment has two-stage diaphragm chambers of a first-stage diaphragm body 1 and a second-stage diaphragm body 2, and the second-stage diaphragm body 2 directly contacts the high-temperature medium, and has a long service life due to the high-temperature resistance of the diaphragm.

[0025] The high-pressure end chamber and the low-pressure end chamber are filled with a first filling liquid, and the first filling liquid has a measurement accuracy temperature of -40℃ to 200℃.

[0026] The second-stage diaphragm body 2 has a two-stage chamber, and the two-stage chamber is filled with a first filling liquid, and the first filling liquid has a measurement accuracy temperature of 10℃ to 600℃.

[0027] The second-stage diaphragm body 2 has a mounting clamp plate 4, and a red copper gasket 3 is arranged between the mounting clamp plate 4 and the second-stage diaphragm body 2.

[0028] The mounting clamp plate 4 has a through hole for connecting the second-stage diaphragm body 2.

[0029] The mounting clamp plate 4 is tightly sealed with the first-stage diaphragm body 1 and the second-stage diaphragm body 2 by a fixing bolt 9 and a fixing nut 5.

[0030] Two capillary tubes 8 are further included, and the two capillary tubes 8 are respectively connected to the high-pressure end chamber and the low-pressure end chamber. The first-stage diaphragm body 1 is connected to a transmitter through the capillary tubes 8, and has good performance in a low-temperature environment.

[0031] A protection hose 7 and a protection handle 6 are further included, the protection hose 7 is arranged outside the two capillary tubes 8, the protection hose 7 has a wave-shaped curved line on the wall, the protection handle 6 is fixedly connected to the first-stage diaphragm body 1, and the protection hose 7 is arranged in the protection handle 6.

[0032] The diaphragm body of the embodiment has small volume, high accuracy, convenient mounting of the clamp plate, good performance in special working conditions, and the hole distance on the clamp plate can be directly matched with a standard three-valve group, which is convenient for subsequent pipe connection, pressure maintaining and pressure relief.

Claims

1. A dual-diaphragm differential pressure measuring device, comprising a first-stage diaphragm body, wherein the first-stage diaphragm body has a high-pressure end chamber and a low-pressure end chamber on both sides, characterized in that: A second-stage diaphragm is provided on each of the two sides of the first-stage diaphragm. The high-pressure end chamber and the low-pressure end chamber of the first-stage diaphragm are respectively sealed and connected to the second-stage diaphragm on their adjacent sides.

2. The dual-diaphragm differential pressure measuring device according to claim 1, characterized in that: The high-pressure end chamber and the low-pressure end chamber are filled with a first filling liquid, the first filling liquid having a measurement accuracy temperature of -40℃ to 200℃.

3. The dual-diaphragm differential pressure measuring device according to claim 1, characterized in that: The second-stage diaphragm body has a secondary chamber, which is filled with a first filling liquid. The temperature of the first filling liquid has a measurement accuracy range of 10°C to 600°C.

4. The dual-diaphragm differential pressure measuring device according to claim 1, characterized in that: The second-stage diaphragm body has an installation clamp, and a copper gasket is provided between the installation clamp and the second-stage diaphragm body.

5. The dual-diaphragm differential pressure measuring device according to claim 4, characterized in that: The mounting clamp has a through hole for connecting the second-stage diaphragm.

6. The dual-diaphragm differential pressure measuring device according to claim 4, characterized in that: The mounting clamp uses fixing bolts and fixing nuts to press and seal the first-stage diaphragm body and the second-stage diaphragm body together.

7. The dual-diaphragm differential pressure measuring device according to claim 1, characterized in that: It also includes two capillary tubes, which are respectively connected to the high-pressure end chamber and the low-pressure end chamber.

8. The dual-diaphragm differential pressure measuring device according to claim 7, characterized in that: It also includes a protective hose disposed outside the two capillaries.

9. A dual-diaphragm differential pressure measuring device according to claim 8, characterized in that: The wall of the protective hose is provided with a wavy, curved pattern.

10. A dual-diaphragm differential pressure measuring device according to claim 8, characterized in that: It also includes a protective handle that is fixedly connected to the first-stage diaphragm, and the protective hose is disposed inside the protective handle.

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