CN114323401A - Pressure transmitter and remote pressure measuring device - Google Patents

Abstract

The invention relates to the technical field of pressure measurement, and provides a pressure transmitter and a remote transmission pressure detection device, wherein the pressure transmitter comprises a shell, a measurement diaphragm, a first diaphragm and a second diaphragm, the shell is provided with a measurement cavity and an atmospheric pressure conduction cavity which are used for accommodating a conduction medium, the measurement diaphragm is arranged in the measurement cavity, the first diaphragm is arranged between the measurement cavity and the atmospheric pressure conduction cavity to separate the measurement cavity from the atmospheric pressure conduction cavity, the second diaphragm is used for separating the atmospheric pressure conduction cavity from the outside, and the pressure transmitter can effectively eliminate the pressure conduction difference between a measured pressure end and an atmospheric pressure end of the remote transmission pressure measurement device, so that the measurement precision of the remote transmission pressure measurement device is effectively improved.

Description

Pressure transmitter and remote pressure measuring device

technical field

The invention relates to the technical field of pressure measurement, in particular to a pressure transmitter and a remote pressure measurement device.

Background technique

The remote pressure measuring device is widely used in the modern industrial automatic control environment. Its working principle is that the atmospheric pressure is transmitted to the pressure transmitter through the low pressure diaphragm of the pressure transmitter and the conductive medium in the measurement cavity of the pressure transmitter in turn. The measured pressure is transmitted to the pressure transmitter through the conductive medium in the capillary, the high-pressure diaphragm of the pressure transmitter and the conductive medium in the measurement cavity of the pressure transmitter. On the measuring diaphragm in the measuring chamber, the resultant force of the atmospheric pressure and the measured pressure causes the measuring diaphragm to have a certain displacement. The displacement value is converted into an electrical signal and converted into a pressure value for output, and the measured pressure value can be obtained.

However, in practical applications, because the conductive medium in the capillary is easily affected by the external temperature, the phenomenon of thermal expansion and cold contraction occurs, resulting in changes in the measured pressure during the conduction process, which ultimately leads to inaccurate measurement results.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a pressure transmitter and a remote pressure measurement device, aiming at solving the technical problem of low measurement accuracy of the existing remote pressure measurement device.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a pressure transmitter, comprising a casing, a measuring diaphragm, a first diaphragm and a second diaphragm, and the casing has a pressure transmitter, each of which is used for accommodating a conductive medium. The measurement cavity and the atmospheric pressure conduction cavity, the measurement diaphragm is arranged in the measurement cavity, and the first membrane is arranged between the measurement cavity and the atmospheric pressure conduction cavity to connect the measurement The cavity is separated from the atmospheric pressure conduction cavity, and the second diaphragm is used to separate the atmospheric pressure conduction cavity from the outside.

The pressure transmitter provided by the present invention has at least the following beneficial effects: during operation, the atmospheric pressure is sequentially conducted to the second diaphragm, the conducting medium in the atmospheric pressure conducting cavity, the first diaphragm and the conducting medium in the measuring cavity. On the measuring diaphragm in the measuring cavity, since the conduction medium in the atmospheric pressure conduction cavity and the conduction medium in the capillary of the remote pressure measuring device are affected by the external temperature to the same extent, it is approximately considered that the temperature changes are the same, so that the remote transmission The pressure change in the capillary tube of the pressure measuring device is offset by the pressure change caused by the influence of the external temperature, thereby eliminating the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measuring device, and effectively improving the remote pressure measurement. The measurement accuracy of the device.

In one embodiment, the pressure transmitter further includes an adjustment component, the atmospheric pressure conduction cavity has an adjustment port, and the adjustment component is sealedly installed in the adjustment port and used to change the atmospheric pressure conduction cavity volume.

In one embodiment, the adjustment assembly includes a mounting seat mounted on the housing and a piston sealingly connected in the adjustment port, the piston is mounted on the mounting seat so as to reciprocate along the axis .

In one embodiment, the mounting seat is provided with a threaded hole, an end of the piston close to the mounting seat is provided with a threaded portion, and the threaded portion is threadedly connected to the threaded hole of the mounting seat.

In one embodiment, the adjustment assembly further includes a first sealing ring sleeved on the piston, the first sealing ring abutting between the piston and the inner wall of the adjustment port.

In one embodiment, the mounting seat can be installed in the adjustment port so as to reciprocate along the axis of the piston, the outer circumference of the piston protrudes to form a convex ring, and the adjustment assembly further includes a sleeve sleeved on the adjustment port. a second sealing ring on the piston, the second sealing ring abuts between the piston and the inner wall of the adjustment port, and the mounting seat is used to abut the second sealing ring against the convex on the ring.

In one embodiment, an inner wall of the adjustment port forms an inner thread, and an outer peripheral wall of the mounting seat forms an outer thread matched with the inner thread.

In one embodiment, the adjustment assembly further includes a pressing member, the pressing member abuts between the second sealing member and the mounting seat.

In one of the embodiments, the atmospheric pressure conduction cavity is divided into a conduction cavity and a regulation cavity that communicate with each other, and the conduction cavity has an output port disposed opposite to the first diaphragm and opposite to the second diaphragm An input port is provided, and the adjustment chamber has the adjustment port.

In order to achieve the above object, the present invention also provides a remote pressure measurement device, comprising a remote joint, a capillary tube for accommodating a conductive medium, and the above-mentioned pressure transmitter, wherein the pressure transmitter includes a third diaphragm and the The housing of the pressure transmitter has a high pressure interface, the third diaphragm is arranged between the measurement cavity and the high pressure interface to separate the measurement cavity from the high pressure interface, and the remote transmission A connector is connected to the high pressure port through the capillary.

Since the above-mentioned remote pressure measuring device adopts all the embodiments of the above-mentioned pressure transmitter, it has at least all the beneficial effects of the above-mentioned embodiments, which will not be repeated here.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic structural diagram of a remote pressure measurement device provided by an embodiment of the present invention;

Fig. 2 is the structural representation of the pressure transmitter in the remote pressure measuring device shown in Fig. 1;

Fig. 3 is the A-A sectional view of the pressure transmitter shown in Fig. 2;

FIG. 4 is an exploded view of an adjustment assembly provided by an embodiment of the present invention.

Among them, each reference sign in the figure:

10. Pressure transmitter, 11, housing, 111, measuring cavity, 1111, high pressure cavity, 1112, low pressure cavity, 112, atmospheric pressure conduction cavity, 1121, conduction cavity, 1122, adjustment cavity, 1123, adjustment port, 1124, input port, 1125, output port, 113, injection port, 114, high pressure port, 12, first diaphragm, 13, second diaphragm, 14, adjustment assembly, 141, piston, 1411, thread , 1412, convex ring, 142, mounting seat, 1421, threaded hole, 143, first sealing ring, 144, second sealing ring, 145, pressure-applying piece, 15, blocking assembly, 151, fastener, 152, Blocking piece, 16, third diaphragm, 17, measuring diaphragm, 20, remote joint, 30, capillary.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second", "third" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

2 and 3, a pressure transmitter 10 includes a casing 11, a measuring diaphragm 17, a first diaphragm 12 and a second diaphragm 13. The casing 11 has the The measurement cavity 111 and the atmospheric pressure conduction cavity 112 of the medium, the measurement diaphragm 17 is arranged in the measurement cavity 111, and the first diaphragm 12 is arranged between the measurement cavity 111 and the atmospheric pressure conduction cavity 112 to connect the measurement cavity 111 Separated from the atmospheric pressure conduction cavity 112 , the second diaphragm 13 is used to separate the atmospheric pressure conduction cavity 112 from the outside.

When the pressure transmitter 10 is working, the atmospheric pressure is conducted to the measuring cavity 111 through the second diaphragm 13 , the conducting medium in the atmospheric pressure conducting cavity 112 , the first diaphragm 12 and the conducting medium in the measuring cavity 111 in sequence. On the measuring diaphragm 17, since the conducting medium in the atmospheric pressure conducting cavity 112 and the conducting medium in the capillary 30 of the remote pressure measuring device are affected to the same extent by the external temperature, it is approximately considered that the temperature changes are the same, so that the remote pressure The pressure change of the conductive medium in the capillary 30 of the measuring device is offset by the influence of the external temperature, thereby eliminating the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measuring device, effectively improving the remote pressure measurement. The measurement accuracy of the device.

Specifically, the above-mentioned conductive medium is one of silicone oil, fluorine oil and castor oil.

Specifically, as shown in FIG. 3 , the measuring diaphragm 17 separates the measuring cavity 111 to form a high-pressure cavity 1111 and a low-pressure cavity 1112 symmetrically arranged with each other, and the first diaphragm 12 is arranged in the low-pressure cavity 1112 and the atmospheric pressure conduction cavity between the bodies 112 .

In this embodiment, as shown in FIG. 3 , the pressure transmitter 10 further includes an adjustment component 14 , the atmospheric pressure conduction cavity 112 has an adjustment port 1123 , and the adjustment component 14 is sealed and installed in the adjustment port 1123 and is used to change the atmospheric pressure conduction The volume of the cavity 112 . By setting the adjustment assembly 14, the volume of the atmospheric pressure conduction cavity 112 can be adjusted according to the volume of the different capillary tubes 30, so that the volume of the atmospheric pressure conduction cavity 112 is consistent with the volume of the capillary tube 30, which more effectively eliminates the problem of the remote pressure measurement device. The pressure conduction difference between the measured pressure end and the atmospheric pressure end can further improve the measurement accuracy of the remote pressure measurement device.

Specifically, as shown in FIG. 3 and FIG. 4 , the adjusting assembly 14 includes a mounting seat 142 mounted on the housing 11 and a piston 141 sealingly connected to the adjusting port 1123 . The piston 141 can be reciprocated along the axis and mounted on the mounting seat 141 . on seat 142. By operating the piston 141 to move along its own axis, the volume of the atmospheric pressure conduction cavity 112 can be changed according to the volume of different capillary tubes 30, so that the volume of the atmospheric pressure conduction cavity 112 is consistent with the volume of the capillary tube 30.

Specifically, as shown in FIG. 4 , the mounting seat 142 is provided with a threaded hole 1421 , the end of the piston 141 close to the mounting seat 142 is provided with a threaded portion 1411 , and the threaded portion 1411 is threadedly connected to the threaded hole 1421 of the mounting seat 142 . Rotating the piston 141 can effectively realize the reciprocating movement of the piston 141 along its own axis, so as to adjust the solvent in the atmospheric pressure conduction cavity 112 , and the piston 141 and the mounting seat 142 can effectively realize the atmospheric pressure conduction cavity 112 by adopting a screw fit method. The volume of the remote pressure measurement device can be fine-tuned to more effectively eliminate the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measurement device, thereby further improving the measurement accuracy of the remote pressure measurement device.

Specifically, as shown in FIG. 4 , in order to facilitate the operator to use an adjusting tool (such as a screwdriver) to rotate the piston 141 , the outer end of the threaded portion 1411 is provided with an operation port 1413 .

Specifically, as shown in FIG. 3 and FIG. 4 , the adjustment assembly 14 further includes a first sealing ring 143 sleeved on the piston 141 , and the first sealing ring 143 abuts between the piston 141 and the inner wall of the adjustment port 1123 . By arranging the first sealing ring 143 between the piston 141 and the inner wall of the adjustment port 1123, the adjustment port 1123 is effectively sealed, the conduction medium is prevented from leaking out through the adjustment port 1123, and the atmospheric pressure conduction cavity 112 after volume adjustment is effectively ensured. The storage capacity of the conductive medium is consistent with the storage capacity of the conductive medium in the capillary tube 30, which more effectively eliminates the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measurement device, thereby further improving the remote transmission pressure measurement device. measurement accuracy.

Specifically, as shown in FIG. 3 and FIG. 4 , the mounting seat 142 can be reciprocally installed in the adjustment port 1123 along the axis of the piston 141 , the outer circumference of the piston 141 protrudes to form a convex ring 1412 , and the adjustment assembly 14 also includes a sleeve The second sealing ring 144 on the piston 141 abuts between the piston 141 and the inner wall of the adjustment port 1123 , and the mounting seat 142 is used to abut the second sealing ring 144 against the convex ring 1412 . When the volume of the atmospheric pressure conduction cavity 112 needs to be increased, firstly rotate the mounting seat 142 in the forward direction to make the mounting seat 142 move outward along the axis of the piston 141, and then operate the piston 141 to move outward along its own axis, and then reverse Rotate the mounting seat 142 to move the mounting seat 142 into the adjustment port 1123 along the axis of the piston 141 until the second sealing ring 144 abuts on the convex ring 1412 of the piston 141; When the volume adjustment is small, first operate the piston 141 to move into the adjustment port 1123 along its own axis, and then reversely rotate the mounting seat 142 to move the mounting seat 142 along the axis of the piston 141 into the adjustment port 1123 until the second sealing ring 144 is pressed against the adjustment port 1123. leaning on the convex ring 1412 of the piston 141; in this way, by disposing the second sealing ring 144 and abutting the second sealing ring 144 between the mounting seat 142 and the convex ring 1412 of the piston 141, the adjustment port 1123 is effectively sealed, Prevent the conduction medium from leaking out through the adjustment port 1123, effectively ensure that the storage volume of the conduction medium in the atmospheric pressure conduction cavity 112 after volume adjustment is consistent with the storage volume of the conduction medium in the capillary 30, and more effectively eliminate the problem of the remote pressure measurement device. The pressure conduction difference between the measured pressure end and the atmospheric pressure end can further improve the measurement accuracy of the remote pressure measurement device.

Specifically, as shown in FIGS. 3 and 4 , in order to ensure that the first sealing ring 143 is tightly pressed against the inner wall of the adjustment port 1123 , the first sealing ring 143 is sleeved on the convex ring 1412 of the piston 141 .

Specifically, as shown in FIG. 3 and FIG. 4 , the inner wall of the adjustment port 1123 forms an inner thread, and the outer wall of the mounting seat 142 forms an outer thread that matches the inner thread. By adopting the above technical solution, the reciprocating movement of the mounting seat 142 in the adjustment port 1123 along the axis of the piston 141 is effectively realized.

Specifically, as shown in FIG. 3 and FIG. 4 , the adjustment assembly 14 further includes a pressing member 145 , and the pressing member 145 abuts between the second sealing ring 144 and the mounting seat 142 . By arranging the pressing member 145 between the second sealing ring 144 and the mounting seat 142, the second sealing ring 144 can be effectively abutted on the convex ring 1412 of the piston 141, and at the same time, the second sealing ring 144 can also be effectively avoided. It rotates together with the mount 142, thereby sealing the adjustment port 1123 more effectively.

In this embodiment, referring to FIG. 3 , the atmospheric pressure conduction cavity 112 is divided into a conduction cavity 1121 and an adjustment cavity 1122 that communicate with each other. The conduction cavity 1121 has an output port 1125 opposite to the first diaphragm 12 and an output port 1125 opposite to the first diaphragm 12 . The input ports 1124 of the two diaphragms 13 are arranged opposite to each other, and the adjustment chamber 1122 has an adjustment port 1123 . By dividing the atmospheric pressure conduction cavity 112 into the conduction cavity 1121 and the adjustment cavity 1122 that communicate with each other, the interference of the adjustment component 14 on the conduction path of atmospheric pressure can be effectively avoided, and the atmospheric pressure can be effectively transmitted to the measurement cavity 111 of the housing 11. In addition, the volume adjustment function of the atmospheric pressure conduction cavity 112 can be effectively realized.

In this embodiment, referring to FIG. 3 , the pressure transmitter 10 further includes a blocking component 15 , the housing 11 also has a liquid injection port 113 that communicates with the atmospheric pressure conduction chamber 1121 , and the blocking component 15 is sealingly connected to Inside the liquid injection port 113 to block the liquid injection port 113 .

Specifically, as shown in FIG. 3 , the blocking assembly 15 includes a fastener 151 and a blocking member 152 . The fastener 151 is connected to the housing 11 and is used to abut the blocking member 152 against the liquid injection port 113 , so as to effectively seal the liquid injection port 113.

It should be noted that the structural forms of the blocking member 152 include various forms, such as pressing balls, pressing tablets, etc., which are not specifically limited herein.

Referring to FIG. 1, a remote pressure measurement device includes a remote joint 20, a capillary tube 30 for accommodating a conductive medium, and the above-mentioned pressure transmitter 10. The pressure transmitter 10 includes a third diaphragm 16 and The housing 11 of the pressure transmitter 10 has a high pressure interface 114 , the third diaphragm 16 is arranged between the measurement cavity 111 and the high pressure interface 114 to separate the measurement cavity 111 from the high pressure interface 114 , and the remote connector 20 passes through the capillary 30 Connected to the high voltage interface 114 .

Since the above-mentioned remote pressure measurement device adopts all the embodiments of the above-mentioned pressure transmitter 10 , it has at least all the beneficial effects of the above-mentioned embodiments, which will not be repeated here.

Specifically, referring to FIG. 3 , the third diaphragm 16 is disposed between the high-pressure chamber 1111 and the high-pressure port 114 to separate the high-pressure chamber 1111 and the high-pressure port 114 .

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. A pressure transmitter, characterized in that it comprises a casing, a measuring diaphragm, a first diaphragm and a second diaphragm, and the casing has a measuring cavity for accommodating a conducting medium and an atmospheric pressure conduction a cavity, the measurement diaphragm is arranged in the measurement cavity, and the first diaphragm is arranged between the measurement cavity and the atmospheric pressure conduction cavity to separate the measurement cavity from the atmospheric pressure conduction cavity , the second diaphragm is used to separate the atmospheric pressure conduction cavity from the outside. 2 . The pressure transmitter according to claim 1 , wherein the pressure transmitter further comprises an adjustment assembly, the atmospheric pressure conduction cavity has an adjustment port, and the adjustment assembly is sealed and mounted on the adjustment port. 3 . inside and for changing the volume of the atmospheric pressure conducting cavity. 3. The pressure transmitter according to claim 2, wherein the adjustment assembly comprises a mounting seat mounted on the housing and a piston sealingly connected in the adjustment port, the piston can move along the The axis is mounted on the mounting seat in a reciprocating manner. 4 . The pressure transmitter according to claim 3 , wherein the mounting seat is provided with a threaded hole, the end of the piston close to the mounting seat is provided with a threaded portion, and the threaded portion is threadedly connected to the threaded portion. 5 . in the threaded hole of the mounting seat. 5 . The pressure transmitter according to claim 3 , wherein the adjustment assembly further comprises a first sealing ring sleeved on the piston, the first sealing ring abutting against the piston and the piston. 6 . between the inner walls of the adjustment port. 6 . The pressure transmitter according to claim 3 , wherein the mounting seat is reciprocatingly installed in the adjusting port along the axis of the piston, and the outer periphery of the piston protrudes to form a convex ring. 7 . , the adjustment assembly further includes a second sealing ring sleeved on the piston, the second sealing ring abuts between the piston and the inner wall of the adjustment port, and the mounting seat is used to attach the The second sealing ring abuts on the convex ring. 7 . The pressure transmitter according to claim 6 , wherein an inner thread is formed on the inner wall of the adjustment port, and an outer thread matched with the inner thread is formed on the outer peripheral wall of the mounting seat. 8 . 8 . The pressure transmitter according to claim 7 , wherein the adjustment assembly further comprises a pressing member, and the pressing member abuts between the second sealing member and the mounting seat. 9 . 9. The pressure transmitter according to any one of claims 2-8, wherein the atmospheric pressure conduction cavity is divided into a conduction cavity and an adjustment cavity that communicate with each other, and the conduction cavity has a connection with the first An output port arranged opposite to the diaphragm and an input port arranged opposite to the second diaphragm, and the adjustment chamber has the adjustment port. 10. A remote pressure measuring device, characterized in that it comprises a remote joint, a capillary tube for accommodating a conductive medium and the pressure transmitter according to any one of claims 1-9, the pressure transmitter The transmitter includes a third diaphragm and the housing of the pressure transmitter has a high pressure interface, the third diaphragm is arranged between the measurement cavity and the high pressure interface to connect the measurement cavity with the high pressure interface The high pressure interface is separated, and the remote joint is connected to the high pressure interface through the capillary.

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