A remote transmission component and a remote transmission pressure transmitter including the remote transmission component

Abstract

The present invention provides a remote transmission component for a remote pressure transmitter. The remote transmission component comprises a remote transmission component and a tantalum diaphragm (6) covering the outer surface of the remote transmission component, a polytetrafluoroethylene sleeve (2) and a polytetrafluoroethylene cover (4), and a fluororubber sealing ring for sealing the tantalum diaphragm (6), the polytetrafluoroethylene sleeve (2) and the polytetrafluoroethylene cover (4). The present invention also provides a remote pressure transmitter including the remote transmission component. Compared with the original remote pressure transmitter made of all tantalum materials, the remote pressure transmitter provided by the present invention not only reduces the production and use costs, but also ensures that the instrument can work stably and safely for a long time.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, in particular to a corrosion-resistant flange-type remote transmission component with an insertion tube and a remote pressure transmitter comprising the remote transmission component. Background Art

[0002] Pressure transmitter is a device that converts pressure into pneumatic or electric signals for control and remote transmission. It can convert physical pressure parameters such as gas and liquid sensed by the pressure measuring element sensor into standard electrical signals to supply secondary instruments such as indicator alarms, recorders, and regulators for measurement, indication, and process regulation. Pressure transmitter is the most commonly used sensor in industrial practice. It is widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemical, oil wells, electricity, ships, machine tools, pipelines, etc.

[0003] At present, it is known that in the chemical industry, flange diaphragm pressure transmitters are mostly used to measure the pressure or liquid level of the medium. When measuring the pressure of relatively viscous, easy to crystallize and highly corrosive special media, flange pressure transmitters with insert cylinders are used. Among them, for highly corrosive media such as royal acid, the commonly used insert cylinder flange parts are made of 316L material, which is easily corroded and damaged when in contact with the medium. In order to solve this problem, manufacturers usually change the material of the flange, insert cylinder, corrugated base, and diaphragm of the remote transmission components from 316L to tantalum to resist the corrosiveness of royal acid. However, the purchase and processing costs of remote transmission components such as flanges and insert cylinders made of tantalum are very high, and the subsequent welding and manufacturing process is also very difficult to control. Summary of the invention

[0004] In order to solve or alleviate the above problems, the present invention provides a remote transmission component and a remote transmission pressure transmitter including the remote transmission component.

[0005] According to one aspect of the function of the present invention, a remote transmission assembly is provided, including a remote transmission component and a tantalum diaphragm, a polytetrafluoroethylene sleeve and a polytetrafluoroethylene cover covering the outer surface of the remote transmission component, and a fluororubber sealing ring for sealing the tantalum diaphragm, the polytetrafluoroethylene sleeve and the polytetrafluoroethylene cover.

[0006] In an improved embodiment of the present invention, the remote transmission component includes a flange, an insertion tube, a base, a tantalum diaphragm, a capillary tube and a fixing block.

[0007] In an improved embodiment of the present invention, the base is arranged at one end of the insertion tube, and the flange is arranged at the other end of the insertion tube; the tantalum diaphragm is fixed on one side of the base, and one end of the capillary is fixed on the other side of the base, preferably fixed at the center hole position thereof; the polytetrafluoroethylene sleeve and the flange are sleeved on the outer wall of the insertion tube; the polytetrafluoroethylene sleeve is fastened between the base and the flange; the polytetrafluoroethylene cover is covered on the outer peripheral surface of the base and the outer peripheral surface of one end of the polytetrafluoroethylene sleeve; the fixing block is fixed on the other end of the insertion tube opposite to the base; the capillary passes through the insertion tube and passes out from the fixing block, preferably at the center hole position thereof, at the other end of the insertion tube; the polytetrafluoroethylene cover and the tantalum diaphragm and the polytetrafluoroethylene cover and the polytetrafluoroethylene sleeve are fastened and sealed by fluororubber sealing rings and threads.

[0008] In an improved embodiment of the present invention, the insertion cylinder is a stainless steel insertion cylinder, and the capillary is a stainless steel soft capillary.

[0009] In an improved embodiment of the present invention, a filling joint is welded on the side of the fixing block facing away from the base for connecting with the capillary tube.

[0010] In an improved embodiment of the present invention, the filling connector is provided with a filling hole for injecting filling liquid into the capillary tube.

[0011] In an improved embodiment of the present invention, the filling liquid is silicone oil.

[0012] In an improved embodiment of the present invention, the tantalum diaphragm and the capillary are welded and fixed on the base, and the capillary and the fixing block are welded and fixed together, and the flange and the insertion tube are welded and fixed by argon arc welding.

[0013] In an improved embodiment of the present invention, the surface of the tantalum diaphragm is uneven.

[0014] In an improved embodiment of the present invention, the surface of the tantalum diaphragm has a corrugated shape.

[0015] According to another aspect of the present invention, there is provided a remote pressure transmitter, comprising the above-mentioned remote transmission component and a pressure transmitter connected to the remote transmission component, wherein the pressure transmitter is connected to the remote transmission component via an external metal armored capillary.

[0016] According to the remote transmission component and the remote transmission pressure transmitter of the present invention, the beneficial effects that can be obtained are at least:

[0017] The remote transmission component includes a polyfluoro sleeve, a polyfluoro cover, a tantalum diaphragm and a fluororubber sealing ring. Through the structural design of the metal flange coated with a polyfluoro material component, and combined with the use of a tantalum diaphragm, the pressure measurement of highly corrosive media can be achieved. Specifically, when in use, after the insertion sleeve part of the remote transmission component is inserted and contacts the corrosive medium, the pressure is transmitted to the pressure transmitter through the tantalum diaphragm and the inner cavity silicone oil to complete the pressure measurement. At the same time, the polyfluoro sleeve coated on the outside of the insertion tube and the flange sealing surface, the diaphragm is made of tantalum material, and through the isolation of the fluororubber sealing ring, the corrosive medium will not contact the internal stainless steel insertion tube component, and will not be corroded and damaged. In field applications, it can completely replace the original all-tantalum remote pressure transmitter. Since the remote transmission components (flange, insertion tube, base, etc.) are made of stainless steel instead of tantalum, this not only reduces the production and use costs, but also ensures that the instrument can work stably and safely for a long time.

[0018] It should be understood that the foregoing general description and the following detailed description are exemplary illustrations and explanations and should not be used as limitations on the content of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] With reference to the accompanying drawings, further objects, functions and advantages of the present invention will be clarified through the following description of embodiments of the present invention, in which:

[0020] Figure 1 It is a schematic structural diagram of a remote pressure transmitter according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0021] By referring to the exemplary embodiments, the objects and functions of the present invention and the methods for achieving these objects and functions will be explained. However, the present invention is not limited to the exemplary embodiments disclosed below; it can be implemented in different forms. The essence of the description is only to help those skilled in the relevant art to comprehensively understand the specific details of the present invention.

[0022] The present invention aims at the problems that the existing insert-tube flange-type pressure transmitter is easily corroded and damaged when measuring the pressure of highly corrosive media (such as oxalic acid), and the cost is greatly increased and the production process is difficult to control after the remote transmission component is changed to tantalum material. A corrosion-resistant flange-type remote transmission component with an insert-tube and a remote pressure transmitter including the remote transmission component are provided. The remote pressure transmitter can measure the pressure of highly corrosive media through the structural design of the metal flange with a polytetrafluoroethylene material component coated on the outside, and the use of a tantalum diaphragm. Specifically, when the insert-tube part of the remote transmission component is inserted into and contacts the corrosive medium, the pressure is transmitted to the pressure transmitter through the silicone oil in the inner cavity formed by the tantalum diaphragm, the base and the capillary, and the pressure measurement is completed. At the same time, the polytetrafluoroethylene sleeve coated on the outside of the insert-tube and the flange sealing surface, the diaphragm is made of tantalum material, and the corrosive medium will not contact the internal stainless steel insert-tube component through the isolation of the fluororubber sealing ring, and will not corrode and damage the insert-tube component. This not only reduces the production and use costs, but also ensures that the instrument can work stably and safely for a long time.

[0023] In order to make the technical solution of the present invention clearer and more understandable, the remote pressure transmitter of the present invention will be described in detail below with reference to the accompanying drawings and in combination with specific embodiments.

[0024] Figure 1 FIG. 2 is a schematic diagram showing the structure of a remote pressure transmitter according to an exemplary embodiment of the present invention. Figure 1 As shown, the remote pressure transmitter includes a remote transmission assembly and a pressure transmitter 14 connected to the remote transmission assembly. The remote transmission assembly includes a remote transmission component, which includes a tantalum diaphragm 6, an insertion tube 3, a base 5, a capillary 8, a fixing block 11 and a flange 1. The remote transmission assembly also includes a polytetrafluoroethylene sleeve 2, a polytetrafluoroethylene cover 4 and a fluororubber sealing ring not shown.

[0025] A tantalum diaphragm 6 is welded on the front of the base 5 of the insertion tube 3, and one end of a capillary 8 is welded at the center hole position on the back of the base 5. Here, the surface of the tantalum diaphragm 6 is preferably uneven, more preferably has a corrugated shape, and the capillary 8 is preferably a stainless steel soft capillary. The insertion tube 3 is assembled and welded on the outside of the capillary 8. The insertion tube 3 is preferably a stainless steel insertion tube.

[0026] The capillary fixing block 11 is installed in the inner hole of the other end of the insertion tube 3 opposite to the base 5, and then the originally welded capillary 8 is passed through the center hole position. After adjusting to be flush, the outer wall of the capillary 8 and the capillary fixing block 11 are welded and fixed to prevent leakage. Thereafter, the capillary fixing block 11 and the insertion tube 3 are welded together. In addition, the cavity formed by the welded inner hole of the capillary 8, the base 5 and the tantalum diaphragm 6 is leak-checked to ensure sealing.

[0027] Put the PTFE sleeve 2 with a thread on one end on the outer wall of the insertion tube 3, then put on the flange 1 and press it tightly. After the flange 1 and the end surface of the insertion tube 3 are flush, weld (for example, by argon arc welding) to fix. Then weld the filling joint 13 to the end surface of the capillary fixing block 11 and connect it to the capillary 8. The filling joint 13 is connected to the pressure transmitter 14 through the external metal armored capillary. Then put the fluororubber sealing ring 7 into the sealing groove of the PTFE sleeve 2 and the PTFE cover 4 respectively, and tighten and assemble them according to the thread direction. Finally, evacuate the instrument, inject silicone oil 9 through the oil filling hole 12 on the filling joint 13, and seal it.

[0028] In this exemplary embodiment, when measuring corrosive media on site, its pressure is transmitted to the pressure transmitter 14 in turn through the induced deformation of the tantalum diaphragm 6 and the capillary 8 and the silicone oil inside the external armored capillary, completing the measurement and signal conversion output. The polytetrafluoroethylene cover 4, polytetrafluoroethylene sleeve 2 and tantalum diaphragm 6 coated on the outer surface of the metal flange 1 and the insertion tube 3 are tightly sealed through threads and fluororubber sealing rings 7. The material itself has corrosion resistance and protects the remote transmission measurement components of the instrument.

[0029] The remote pressure transmitter of this exemplary embodiment can protect the remote transmission components of the pressure transmitter by specially designing the structure of the remote transmission insert cylinder component and using parts made of corrosion-resistant PTFE and fluororubber special materials (PTFE cover 4, PTFE sleeve 2 and fluororubber sealing ring 7). The procurement and manufacturing costs can be greatly reduced, and the manufacturing process is simple and easy to control.

[0030] In summary, the technical solution of the present invention can achieve pressure measurement of highly corrosive media through the structural design of the metal flange 1 and the insertion tube 3 coated with PTFE material parts, and combined with the use of tantalum diaphragm. Specifically, when the insertion tube part of the remote transmission component is inserted into and contacts the corrosive medium, the pressure is transmitted to the pressure transmitter through the tantalum diaphragm and the silicone oil in the capillary tube to complete the pressure measurement. At the same time, the insertion tube and the flange sealing surface are coated with a PTFE cover and a PTFE sleeve, and the diaphragm is made of tantalum. Through the isolation of the fluororubber sealing ring, the corrosive medium will not contact the internal stainless steel insertion tube parts, and will not corrode and damage the insertion tube parts. This not only reduces the production and use costs, but also ensures that the instrument can work stably and safely for a long time. Moreover, since the production cost is greatly reduced, it can be promoted and used on a large scale.

[0031] In combination with the description and practice of the invention disclosed herein, other embodiments of the invention are easy to think of and understand for those skilled in the art. The description and embodiments are considered to be exemplary only, and the scope of protection of the invention is defined by the claims.

Claims

1. A remote transmission component for a remote pressure transmitter, characterized in that: The remote transmission assembly comprises a remote transmission component and a tantalum diaphragm (6) covering the outer surface of the remote transmission component, a polytetrafluoroethylene sleeve (2) and a polytetrafluoroethylene cover (4), and a fluororubber sealing ring for sealing the tantalum diaphragm (6), the polytetrafluoroethylene sleeve (2) and the polytetrafluoroethylene cover (4); The tantalum diaphragm (6) is located at one end of the remote transmission component, the polytetrafluoroethylene sleeve (2) is sleeved on the outer periphery of the remote transmission component, the polytetrafluoroethylene cover (4) is sleeved on the outer periphery of a port of the polytetrafluoroethylene sleeve (2) close to one end of the tantalum diaphragm (6), and the polytetrafluoroethylene cover (4) surrounds and is connected to the periphery of the tantalum diaphragm (6); The remote transmission component comprises a flange (1), an insertion tube (3), a base (5), a tantalum diaphragm (6), a capillary tube (8) and a fixing block (11); The base (5) is arranged at one end of the insertion tube (3), and the flange (1) is arranged at the other end of the insertion tube (3); The tantalum diaphragm (6) is fixed on one side of the base (5), and one end of the capillary (8) is fixed on the other side of the base (5); The capillary tube (8) passes through the insertion tube (3) and passes out of the fixing block (11) at the other end of the insertion tube (3).

2. The remote transmission component according to claim 1, characterized in that: The polytetrafluoroethylene sleeve (2) and the flange (1) are sleeved on the outer wall of the insertion tube (3); the polytetrafluoroethylene sleeve (2) is fastened between the base (5) and the flange (1); the polytetrafluoroethylene cover (4) is coated on the outer peripheral surface of the base (5) and the outer peripheral surface of one end of the polytetrafluoroethylene sleeve (2); the fixing block (11) is fixed on the other end of the insertion tube (3) opposite to the base (5); the polytetrafluoroethylene cover (4) and the tantalum diaphragm (6) and the polytetrafluoroethylene cover (4) and the polytetrafluoroethylene sleeve (2) are fastened and sealed by fluororubber sealing rings and threads.

3. The remote transmission component according to claim 2, characterized in that: The insertion tube (3) is a stainless steel insertion tube, and the capillary tube (8) is a stainless steel soft capillary tube.

4. The remote transmission component according to claim 2, characterized in that: A filling joint (13) is welded on the side of the fixing block (11) facing away from the base (5) for connecting with the capillary tube (8).

5. The remote transmission component according to claim 4, characterized in that: The filling joint (13) is provided with a filling hole (12) for injecting a filling liquid into the capillary tube (8), and the filling liquid is silicone oil.

6. The remote transmission component according to claim 2, characterized in that: The tantalum diaphragm (6) and the capillary (8) are welded and fixed on the base (5), the capillary (8) and the fixing block (11) are welded and fixed together, and the flange (1) and the insertion tube (3) are welded and fixed by argon arc welding.

7. The remote transmission component according to claim 1, characterized in that: The surface of the tantalum diaphragm (6) is uneven.

8. The remote transmission component according to claim 7, characterized in that: The surface of the tantalum diaphragm (6) has a corrugated shape.

9. A remote pressure transmitter, characterized in that: It comprises a remote transmission component according to any one of claims 1 to 8 and a pressure transmitter (14) connected to the remote transmission component, wherein the pressure transmitter (14) is connected to the remote transmission component via an external metal armored capillary.

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