Pressure transmitter and remote pressure measuring device

Abstract

The present invention relates to the field of pressure measurement technology, and provides a pressure transmitter and a remote pressure detection device. The pressure transmitter comprises a shell, a measuring diaphragm, a first diaphragm and a second diaphragm. The shell has a measuring cavity and an atmospheric pressure conduction cavity both for accommodating a conduction medium. The measuring diaphragm is arranged in the measuring cavity. The first diaphragm is arranged between the measuring cavity and the atmospheric pressure conduction cavity to separate the measuring cavity from the atmospheric pressure conduction cavity. The second diaphragm is used to separate the atmospheric pressure conduction cavity from the outside. The pressure transmitter can effectively eliminate the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measurement device, thereby effectively improving the measurement accuracy of the remote pressure measurement device.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure measurement, and in particular to a pressure transmitter and a remote pressure measurement device. Background Art

[0002] Remote pressure measurement devices are widely used in modern industrial automatic control environments. Their working principle is that the atmospheric pressure is transmitted to the measuring diaphragm in the measuring cavity of the pressure transmitter through the low-pressure diaphragm of the pressure transmitter and the conductive medium in the measuring cavity of the pressure transmitter in turn, while the measured pressure is transmitted to the measuring diaphragm in the measuring cavity of the pressure transmitter through the conductive medium in the capillary, the high-pressure diaphragm of the pressure transmitter and the conductive medium in the measuring cavity of the pressure transmitter in turn. The combined force of the atmospheric pressure and the measured pressure causes a certain displacement of the measuring diaphragm. The displacement value is converted into an electrical signal and converted into a pressure value output to obtain the measured pressure value.

[0003] However, in practical applications, the conducting medium in the capillary tube is easily affected by the external temperature and expands and contracts due to heat, which causes the measured pressure to change during the conduction process, ultimately leading to inaccurate measurement results. Summary of the invention

[0004] The object of the present invention is to provide a pressure transmitter and a remote pressure measuring device, aiming to solve the technical problem of low measurement accuracy of the existing remote pressure measuring devices.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a pressure transmitter, including a shell, a measuring diaphragm, a first diaphragm and a second diaphragm, the shell having a measuring cavity and an atmospheric pressure conduction cavity both for accommodating a conduction medium, the measuring diaphragm is arranged in the measuring cavity, the first diaphragm is arranged between the measuring cavity and the atmospheric pressure conduction cavity to separate the measuring cavity from the atmospheric pressure conduction cavity, and the second diaphragm is used to separate the atmospheric pressure conduction cavity from the outside.

[0006] The pressure transmitter provided by the present invention has at least the following beneficial effects: when working, the atmospheric pressure is sequentially transmitted to the measuring diaphragm in the measuring cavity through the second diaphragm, the conducting medium in the atmospheric pressure conducting cavity, the first diaphragm and the conducting medium in the measuring cavity. Since the conducting medium in the atmospheric pressure conducting cavity and the conducting medium in the capillary of the remote pressure measuring device are affected by the external temperature to the same extent, the temperature changes are approximately considered to be the same, thereby offsetting the pressure changes caused by the conducting medium in the capillary of the remote pressure measuring device being affected by 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 measurement accuracy of the remote pressure measuring device.

[0007] In one embodiment, the pressure transmitter further includes an adjustment component, the atmospheric pressure transmission cavity has an adjustment port, and the adjustment component is sealed and installed in the adjustment port and is used to change the volume of the atmospheric pressure transmission cavity.

[0008] In one embodiment, the adjustment assembly includes a mounting seat mounted on the housing and a piston sealed and connected to the adjustment port, and the piston is mounted on the mounting seat so as to be reciprocatingly movable along an axis.

[0009] In one embodiment, a threaded hole is formed on the mounting seat, and a threaded portion is formed on one end of the piston close to the mounting seat, and the threaded portion is threadedly connected to the threaded hole of the mounting seat.

[0010] In one embodiment, the adjustment assembly further includes a first sealing ring sleeved on the piston, wherein the first sealing ring abuts between the piston and an inner wall of the adjustment port.

[0011] In one embodiment, the mounting seat can be installed in the adjustment port so as to be reciprocatingly movable along the axis of the piston, the outer periphery of the piston protrudes to form a convex ring, and the adjustment assembly also 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 abut the second sealing ring against the convex ring.

[0012] In one embodiment, an inner wall of the adjustment port forms an internal thread, and an outer peripheral wall of the mounting seat forms an external thread matching the internal thread.

[0013] In one embodiment, the adjustment assembly further includes a pressure member, and the pressure member abuts between the second sealing ring and the mounting seat.

[0014] In one embodiment, the atmospheric pressure conduction cavity is divided into a conduction cavity and a regulating cavity which are interconnected, the conduction cavity has an output port arranged opposite to the first diaphragm and an input port arranged opposite to the second diaphragm, and the regulating cavity has the regulating port.

[0015] To achieve the above-mentioned purpose, the present invention also provides a remote pressure measurement device, including a remote connector, a capillary for accommodating a conductive medium and the above-mentioned pressure transmitter, the pressure transmitter including a third diaphragm and the housing of the pressure transmitter having a high-pressure interface, the third diaphragm being arranged between the measuring cavity and the high-pressure interface to separate the measuring cavity from the high-pressure interface, and the remote connector being connected to the high-pressure interface through the capillary.

[0016] Since the above-mentioned remote pressure measurement 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 described one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a remote pressure measurement device provided by an embodiment of the present invention;

[0019] Figure 2 for Figure 1 The structural schematic diagram of the pressure transmitter in the remote pressure measurement device shown;

[0020] Figure 3 for Figure 2 The AA section view of the pressure transmitter shown;

[0021] Figure 4 An exploded view of an adjustment component provided in an embodiment of the present invention.

[0022] Among them, the reference numerals in the figure are:

[0023] 10. Pressure transmitter, 11. Housing, 111. Measuring cavity, 1111. High-pressure cavity, 1112. Low-pressure cavity, 112. Atmospheric pressure conduction cavity, 1121. Conducting cavity, 1122. Adjusting cavity, 1123. Adjusting port, 1124. Input port, 1125. Output port, 113. Filling port, 114. High-pressure interface, 12. First diaphragm, 13. Second diaphragm, 14. Adjusting assembly, 141. Piston, 1411. Threaded portion, 1412. Protruding ring, 142. Mounting seat, 1421. Threaded hole, 143. First sealing ring, 144. Second sealing ring, 145. Pressure member, 15. Sealing assembly, 151. Fastener, 152. Sealing member, 16. Third diaphragm, 17. Measuring diaphragm, 20. Remote transmission connector, 30. Capillary. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Please combine Figure 2 and Figure 3 As shown, a pressure transmitter 10 includes a housing 11, a measuring diaphragm 17, a first diaphragm 12 and a second diaphragm 13. The housing 11 has a measuring cavity 111 and an atmospheric pressure conducting cavity 112, both of which are used to accommodate a conducting medium. The measuring diaphragm 17 is arranged in the measuring cavity 111, the first diaphragm 12 is arranged between the measuring cavity 111 and the atmospheric pressure conducting cavity 112 to separate the measuring cavity 111 from the atmospheric pressure conducting cavity 112, and the second diaphragm 13 is used to separate the atmospheric pressure conducting cavity 112 from the outside.

[0029] When the pressure transmitter 10 is working, the atmospheric pressure is sequentially transmitted 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 to the measuring diaphragm 17 in the measuring cavity 111. 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 by the external temperature to the same extent, it is approximately assumed that the temperature changes are the same, thereby offsetting the pressure changes caused by the conducting medium in the capillary 30 of the remote pressure measuring device affected by 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 measurement accuracy of the remote pressure measuring device.

[0030] Specifically, the conductive medium is one of silicone oil, fluorine oil and castor oil.

[0031] Specifically, please combine Figure 3 As shown, the measuring diaphragm 17 separates the measuring cavity 111 into a high-pressure cavity 1111 and a low-pressure cavity 1112 which are symmetrically arranged with each other, and the first diaphragm 12 is arranged between the low-pressure cavity 1112 and the atmospheric pressure conducting cavity 112 .

[0032] In this embodiment, please combine Figure 3 As shown, the pressure transmitter 10 further includes an adjustment component 14, and the atmospheric pressure transmission cavity 112 has an adjustment port 1123. The adjustment component 14 is sealed and installed in the adjustment port 1123 and is used to change the volume of the atmospheric pressure transmission cavity 112. By setting the adjustment component 14, the volume of the atmospheric pressure transmission cavity 112 can be adjusted according to the volume of different capillaries 30, so that the volume of the atmospheric pressure transmission cavity 112 is consistent with the volume of the capillary 30, and the pressure transmission difference between the measured pressure end and the atmospheric pressure end of the remote pressure measurement device is more effectively eliminated, thereby further improving the measurement accuracy of the remote pressure measurement device.

[0033] Specifically, please combine Figure 3 and Figure 4 As shown, the adjustment assembly 14 includes a mounting seat 142 mounted on the housing 11 and a piston 141 sealed and connected to the adjustment port 1123. The piston 141 is mounted on the mounting seat 142 so as to be reciprocatingly movable along the axis. By operating the piston 141 to move along its own axis, the volume of the atmospheric pressure conducting cavity 112 can be changed according to the volume of different capillaries 30, so that the volume of the atmospheric pressure conducting cavity 112 is consistent with the volume of the capillary 30.

[0034] Specifically, please combine Figure 4As shown, a threaded hole 1421 is provided on the mounting seat 142, and a threaded portion 1411 is provided at one end of the piston 141 close to the mounting seat 142. The threaded portion 1411 is threadedly connected to the threaded hole 1421 of the mounting seat 142. The piston 141 can be effectively moved back and forth along its own axis by rotating the piston 141, thereby adjusting the volume of the atmospheric pressure transmission cavity 112. Moreover, the piston 141 and the mounting seat 142 can effectively fine-tune the volume of the atmospheric pressure transmission cavity 112 by adopting a threaded matching method, and more effectively eliminate the pressure transmission 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.

[0035] Specifically, please combine Figure 4 As shown, in order to facilitate the operator to use an adjustment tool (such as a screwdriver) to rotate the piston 141, an operation port 1413 is provided at the outer end of the threaded portion 1411.

[0036] Specifically, please combine Figure 3 and Figure 4 As shown, the regulating 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 regulating port 1123. By arranging the first sealing ring 143 between the piston 141 and the inner wall of the regulating port 1123, the regulating port 1123 is effectively sealed to prevent the conductive medium from leaking outward through the regulating port 1123, effectively ensuring that the conductive medium storage amount in the atmospheric pressure conductive cavity 112 after volume adjustment is completed is consistent with the conductive medium storage amount in the capillary 30, and more effectively eliminating the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measuring device, thereby further improving the measurement accuracy of the remote pressure measuring device.

[0037] Specifically, please combine Figure 3 and Figure 4As shown, the mounting seat 142 can be installed in the adjustment port 1123 so as to be reciprocatingly movable along the axis of the piston 141. The outer periphery of the piston 141 protrudes to form a convex ring 1412. The adjustment assembly 14 also includes a second sealing ring 144 sleeved on the piston 141. The second sealing ring 144 rests between the piston 141 and the inner wall of the adjustment port 1123. The mounting seat 142 is used to press the second sealing ring 144 against the convex ring 1412. When the volume of the atmospheric pressure transmission cavity 112 needs to be increased, the mounting seat 142 is first rotated forward to move the mounting seat 142 outward along the axis of the piston 141, and then the piston 141 is operated to move outward along its own axis, and then the mounting seat 142 is rotated reversely to move the mounting seat 142 along the axis of the piston 141 toward the adjustment port 1123 until the second sealing ring 144 abuts against the convex ring 1412 of the piston 141; when the volume of the atmospheric pressure transmission cavity 112 needs to be decreased, the piston 141 is first operated to move along its own axis toward the adjustment port 1123, and then the mounting seat 142 is rotated reversely to move the mounting seat 142 along the axis of the piston 141 toward the adjustment port 1123. 123 until the second sealing ring 144 is pressed against the convex ring 1412 of the piston 141; in this way, by setting the second sealing ring 144 and pressing the second sealing ring 144 between the mounting seat 142 and the convex ring 1412 of the piston 141, the regulating port 1123 is effectively sealed to prevent the conductive medium from leaking outward through the regulating port 1123, effectively ensuring that the conductive medium storage amount in the atmospheric pressure conductive cavity 112 after volume adjustment is consistent with the conductive medium storage amount in the capillary 30, and more effectively eliminating the pressure conduction difference between the measured pressure end and the atmospheric pressure end of the remote pressure measuring device, thereby further improving the measurement accuracy of the remote pressure measuring device.

[0038] Specifically, please combine Figure 3 and Figure 4 As shown, in order to ensure that the first sealing ring 143 is tightly pressed against the inner wall of the regulating port 1123 , the first sealing ring 143 is sleeved on the convex ring 1412 of the piston 141 .

[0039] Specifically, please combine Figure 3 and Figure 4 As shown, the inner wall of the regulating port 1123 forms an internal thread, and the outer wall of the mounting seat 142 forms an external thread that matches the internal thread. By adopting the above technical solution, the mounting seat 142 can effectively move back and forth in the regulating port 1123 along the axis of the piston 141.

[0040] Specifically, please combine Figure 3 and Figure 4As shown, the adjustment assembly 14 further includes a pressure member 145, and the pressure member 145 abuts between the second sealing ring 144 and the mounting seat 142. By arranging the pressure member 145 between the second sealing ring 144 and the mounting seat 142, the second sealing ring 144 can be effectively abutted against the convex ring 1412 of the piston 141, and at the same time, the second sealing ring 144 can be effectively prevented from rotating together with the mounting seat 142, so that the adjustment port 1123 is more effectively sealed.

[0041] In this embodiment, please combine Figure 3 As shown, the atmospheric pressure transmission cavity 112 is divided into a transmission cavity 1121 and a regulating cavity 1122 which are interconnected, the transmission cavity 1121 has an output port 1125 arranged opposite to the first diaphragm 12 and an input port 1124 arranged opposite to the second diaphragm 13, and the regulating cavity 1122 has a regulating port 1123. By dividing the atmospheric pressure transmission cavity 112 into the transmission cavity 1121 and the regulating cavity 1122 which are interconnected, the regulating component 14 is effectively prevented from interfering with the transmission path of the atmospheric pressure, which can effectively ensure that the atmospheric pressure is effectively transmitted to the measuring cavity 111 of the housing 11, and can also effectively realize the volume adjustment function of the atmospheric pressure transmission cavity 112.

[0042] In this embodiment, please combine Figure 3 As shown, the pressure transmitter 10 further includes a blocking component 15 , and the housing 11 further includes a liquid injection port 113 communicating with the atmospheric pressure conduction chamber 1121 . The blocking component 15 is sealedly connected in the liquid injection port 113 to block the liquid injection port 113 .

[0043] Specifically, please combine Figure 3 As shown, 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 press the blocking member 152 against the edge of the liquid injection port 113 to effectively seal the liquid injection port 113 .

[0044] It should be noted that the blocking member 152 may have various structural forms, such as a pressed ball, a pressed sheet, etc., which are not specifically limited here.

[0045] Please combine Figure 1 As shown, a remote pressure measuring device includes a remote connector 20, a capillary 30 for accommodating a conducting 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 a measuring cavity 111 and the high-pressure interface 114 to separate the measuring cavity 111 from the high-pressure interface 114, and the remote connector 20 is connected to the high-pressure interface 114 through the capillary 30.

[0046] 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 described one by one here.

[0047] Specifically, please combine Figure 3 As shown, the third diaphragm 16 is disposed between the high pressure chamber 1111 and the high pressure interface 114 to separate the high pressure chamber 1111 from the high pressure interface 114 .

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A remote pressure measurement device, characterized in that: The invention comprises a remote transmission connector (20), a capillary tube (30) for accommodating a conducting medium, and a pressure transmitter (10), wherein the pressure transmitter (10) comprises a housing (11), a measuring diaphragm (17), a first diaphragm (12), and a second diaphragm (13); the housing (11) has a measuring cavity (111) and an atmospheric pressure conducting cavity (112) both for accommodating the conducting medium; the measuring diaphragm (17) is arranged in the measuring cavity (111) to separate the measuring cavity (111) into a high-pressure cavity (1111) and a low-pressure cavity (1112); the first diaphragm (12) is arranged between the measuring cavity (111) and the atmospheric pressure conducting cavity (112) to separate the measuring cavity (111) from the atmospheric pressure conducting cavity (112); and the second diaphragm (13) is used to separate the atmospheric pressure conducting cavity (112) from the outside; The pressure transmitter (10) further comprises 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 measuring cavity (111) and the high-pressure interface (114) to separate the measuring cavity (111) from the high-pressure interface (114), and the remote transmission connector (20) is connected to the high-pressure interface (114) through the capillary tube (30); The pressure transmitter (10) further comprises an adjustment component (14), the atmospheric pressure transmission cavity (112) having an adjustment port (1123), the adjustment component (14) being sealedly installed in the adjustment port (1123) and being used to change the volume of the atmospheric pressure transmission cavity (112); The atmospheric pressure conduction cavity (112) is divided into a conduction cavity (1121) and a regulating cavity (1122) which are interconnected. The conduction cavity (1121) has an output port (1125) arranged opposite to the first diaphragm (12) and an input port (1124) arranged opposite to the second diaphragm (13). The regulating cavity (1122) has the regulating port (1123).

2. The remote pressure measuring device according to claim 1, characterized in that: The adjustment assembly (14) comprises a mounting seat (142) mounted on the housing (11) and a piston (141) sealed and connected to the adjustment port (1123); the piston (141) is mounted on the mounting seat (142) so as to be reciprocatingly movable along an axis.

3. The remote pressure measurement device according to claim 2, characterized in that: A threaded hole (1421) is provided on the mounting seat (142), and a threaded portion (1411) is provided at one end of the piston (141) close to the mounting seat (142), and the threaded portion (1411) is threadedly connected to the threaded hole (1421) of the mounting seat (142).

4. The remote pressure measurement device according to claim 2, characterized in that: The regulating assembly (14) further comprises a first sealing ring (143) sleeved on the piston (141), wherein the first sealing ring (143) abuts between the piston (141) and the inner wall of the regulating port (1123).

5. The remote pressure measurement device according to claim 2, characterized in that: The mounting seat (142) can be installed in the regulating port (1123) so as to be reciprocatingly movable along the axis of the piston (141); the outer periphery of the piston (141) protrudes to form a convex ring (1412); the regulating assembly (14) further comprises a second sealing ring (144) sleeved on the piston (141); the second sealing ring (144) abuts between the piston (141) and the inner wall of the regulating port (1123); the mounting seat (142) is used to abut the second sealing ring (144) against the convex ring (1412).

6. The remote pressure measurement device according to claim 5, characterized in that: The inner wall of the adjustment port (1123) is formed with an internal thread, and the outer peripheral wall of the mounting seat (142) is formed with an external thread matching the internal thread.

7. The remote pressure measurement device according to claim 6, characterized in that: The adjustment assembly (14) further comprises a pressure member (145), wherein the pressure member (145) abuts between the second sealing ring and the mounting seat (142).

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