High-precision pressure transmitter special for petroleum and chemical industry

Abstract

The utility model relates to a high accuracy pressure transmitter special for petroleum chemical industry, including transmitter body and the filter device connected in the pressure inlet of transmitter body, the filter device includes the casing and installs the inner filter cover and outer filter cover of open downward in the casing, the inner filter cover is sleeved in the outer filter cover, and the filter hole of inner filter cover is less than the filter hole of outer filter cover, the middle part of casing is connected and has the liquid inlet pipe and liquid outlet pipe, the lower extreme of liquid inlet pipe and liquid outlet pipe is higher than the lower extreme of casing, and the oil liquid of measurement enters the casing along the liquid inlet pipe, and after double filtration of inner and outer filter cover, enters the transmitter body again by liquid outlet pipe, the utility model discloses the filter device containing the filter cover of inner and outer double through setting, utilizes the structure that the filter hole of inner filter cover is less than the filter hole of outer filter cover, and carries out two -stage filtration from coarse to fine to the oil liquid of measurement, can effectively intercept the solid impurity of different particle size, fundamentally prevents the pressure inlet from being blocked by impurity, ensures the smooth of pressure transmission and the accuracy of measurement signal.

Description

Technical Field

[0001] This utility model relates to the field of pressure measurement technology, and in particular to a high-precision pressure transmitter for petrochemical industry. Background Technology

[0002] Pressure transmitters are indispensable instruments in the petrochemical industry, widely used for process pressure monitoring in equipment such as oil storage tanks and oil pipelines. The accuracy of their measurement data is closely related to production safety, efficiency, and quality control.

[0003] However, in actual applications involving petroleum and petrochemical products, the measured media often contain various impurities such as waxes, asphalt, and solid particles. During long-term use, the pressure inlet or pressure port of existing conventional pressure transmitters is easily clogged by these impurities. Once clogging occurs, the pressure transmission channel becomes obstructed, preventing the internal sensing unit from promptly and accurately sensing the true pressure changes of the measured medium. This results in delayed, distorted, or even completely malfunctioning measurement values, severely impacting the measurement accuracy and reliability of the pressure transmitter. Utility Model Content

[0004] To address the problems of decreased measurement accuracy and poor stability caused by impurities in petroleum media in existing pressure transmitters, this invention provides a high-precision pressure transmitter specifically for petrochemical applications.

[0005] The technical solution is as follows: A high-precision pressure transmitter for petrochemical industry, comprising a transmitter body and a filter device connected to the pressure inlet of the transmitter body. The filter device includes a housing and an inner filter cover and an outer filter cover with downward openings installed inside the housing. The inner filter cover is fitted inside the outer filter cover, and the filter holes of the inner filter cover are smaller than those of the outer filter cover. An inlet pipe and an outlet pipe are connected and communicated in the middle of the housing. The lower ends of the inlet pipe and the outlet pipe are higher than the lower end of the housing. The oil to be measured enters the housing along the inlet pipe, is filtered twice by the inner and outer filter covers, and then enters the transmitter body through the outlet pipe.

[0006] Furthermore, each filter hole of the outer filter cover is provided with a flow guide cover inside, which covers the upper end of the filter hole and is used to guide impurities in the fluid to deposit downwards.

[0007] Furthermore, the bottom of the housing has an opening, and the opening is provided with a threaded end cap. The bottom of the end cap has a drain port and is fitted with a plug. The drain port is located on the side of the end cap near the outlet pipe.

[0008] Furthermore, a bearing is provided at the bottom of the end cap. The outer ring of the bearing is fixed to the end cap, and a plug is fixed to the inner ring. The outer diameter of the plug matches the inner diameter of the opening of the inner filter cover, and the inner filter cover can be inserted into the plug and rotate accordingly.

[0009] Furthermore, multiple baffles are evenly distributed on the inner side of the housing, and the multiple baffles are inclined against the direction of fluid flow, with one end of the baffle close to the outer wall of the outer filter cover.

[0010] Furthermore, a ball valve is installed on the inlet pipe.

[0011] Compared with the prior art, the present invention has the following advantages: 1. This utility model, by setting up a filtration device including inner and outer double filter covers, utilizes the structure that the filter holes of the inner filter cover are smaller than those of the outer filter cover to perform two-stage filtration of the oil to be tested, from coarse to fine. This can effectively intercept solid impurities of different particle sizes, fundamentally preventing impurities from clogging the pressure inlet, ensuring smooth pressure transmission and accurate measurement signals, thereby significantly improving the measurement accuracy and long-term working stability of the transmitter in complex petrochemical media.

[0012] 2. By setting a flow guide hood inside each filter hole of the outer filter cover, this utility model can change the fluid flow direction and guide impurities to deposit downwards and detach from the filter hole area under the action of gravity, thereby slowing down the adhesion and accumulation speed of impurities on the filter hole surface and extending the effective working time and maintenance cycle of the filter cover.

[0013] 3. By providing a detachable end cap and drain port at the bottom of the housing, the sludge and impurities accumulated at the bottom of the filter device can be easily cleaned and discharged, greatly simplifying maintenance operations.

[0014] 4. This utility model allows the inner filter cover to rotate flexibly relative to the outer filter cover through the cooperation of the bearing and the plug. The inner filter pores are small, and impurities are very easy to clog in the pores. The inner filter cover can reduce large-area local clogging and improve the filtration effect by rotating through fluid impact.

[0015] 5. By setting inclined baffles on the inner wall of the shell, the present invention can generate a controllable vortex in the incoming oil, and use centrifugal force to cause impurities with higher density to separate from the fluid in advance and settle to the shell wall, thereby realizing the pre-separation of impurities. Attached Figure Description

[0016] Figure 1 This is an exploded view of the filtration device of this utility model.

[0017] Figure 2 This is a longitudinal sectional view of the shell and the inlet and outlet pipes of this utility model.

[0018] Figure 3 This is a schematic diagram of the drainage cover of this utility model.

[0019] Figure 4 This is a three-dimensional structural diagram of the present invention.

[0020] The meanings of the reference numerals in the figure are as follows: 1: Transmitter body, 2: Filter device, 21: Housing, 211: Baffle, 212: Limiting protrusion, 22: Inner filter cover, 222: First side baffle, 23: Outer filter cover, 231: Drain cover, 232: Second side baffle, 233: Radial extension, 24: Inlet pipe, 241: Flange interface, 25: Outlet pipe, 251: Threaded interface, 26: End cap, 261: Drain port, 262: Bearing, 263: Plug, 3: Ball valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 4 This embodiment provides a high-precision petrochemical-specific pressure transmitter, including a transmitter body 1 and a filter device 2 connected to its pressure inlet. The filter device 2 includes a cylindrical housing 21, with an inlet pipe 24 and an outlet pipe 25 connected and communicating on both sides of the middle portion of the housing 21. A ball valve 3 is installed on the inlet pipe 24 for quickly shutting off the oil circuit during maintenance. The end of the inlet pipe 24 is provided with a flange interface 241 for easy connection to oil storage tanks or pipelines; the end of the outlet pipe 25 adopts a threaded interface 251 with a movable nut for easy and tight connection to the pressure inlet of the transmitter body 1. This structure allows the entire filter device 2 to be flexibly disassembled for easy maintenance. In particular, the lower ends of both the inlet pipe 24 and the outlet pipe 25 are higher than the bottom of the housing 21, which creates an independent impurity deposition area at the bottom of the housing 21.

[0023] refer to Figure 1 and Figure 2 Inside the housing 21, an outer filter cover 23 and an inner filter cover 22 with downward-facing openings are installed, with the inner filter cover 22 fitted inside the outer filter cover 23. To achieve two-stage filtration from coarse to fine, the filter hole diameter of the inner filter cover 22 is smaller than that of the outer filter cover 23. This structure can effectively intercept impurities of different particle sizes in the petroleum medium and prevent the transmitter pressure inlet from being blocked.

[0024] To ensure that the oil must pass through the filter cover and cannot flow through the gaps via a short circuit, this invention features a precise anti-short circuit structure. A pair of first side baffles 222 are positioned opposite each other on the outer side of the inner filter cover 22. When the inner filter cover 22 is installed into the outer filter cover 23, the first side baffles 222 are tightly attached to the inner surface of the outer filter cover 23. Correspondingly, a pair of second side baffles 232 are positioned opposite each other on the outer side of the outer filter cover 23. When the outer filter cover 23 is installed into the housing 21, the second side baffles 232 are tightly attached to the inner surface of the housing 21. These side baffles work together to force the oil flow through the filter holes, ensuring that the filtration effect is not affected by bypass flow.

[0025] For details, please refer to the following: Figure 2 To further improve impurity separation efficiency, multiple baffles 211 inclined against the direction of fluid flow are evenly distributed on the inner wall of the housing 21, with one end close to the outer wall of the outer filter cover 23. When oil enters the housing 21 from the inlet pipe 24, these baffles 211 can guide the fluid flow, and the guiding effect causes the denser impurities to settle downwards along the housing wall, achieving pre-separation of impurities and effectively reducing the filtration load of the subsequent filter cover.

[0026] like Figure 3 As shown, to prevent impurities from clogging the filter holes and extend the maintenance cycle, this utility model provides a flow guide hood 231 inside each filter hole of the outer filter cover 23. The flow guide hood 231 covers the upper end of the filter hole and can change the flow direction of the fluid, guiding impurities downwards and away from the filter hole area under the action of gravity, thereby slowing down the adhesion and accumulation rate of impurities on the surface of the filter hole.

[0027] In addition, the bottom of the housing 21 has an opening and is connected by a threaded end cap 26 that can be completely removed. The bottom of the end cap 26 is offset, and a drain port 261 is provided on the side near the outlet pipe 25, and it is equipped with a plug. When maintenance is required, the plug can be opened to completely drain the sludge and impurities accumulated in the bottom sedimentation area, simplifying maintenance operations.

[0028] Furthermore, a plug 263 is mounted on the inner bottom of the end cap 26 via a bearing 262. The outer ring of the bearing 262 is fixed to the end cap 26, and the inner ring is fixed to the plug 263. The outer diameter of the plug 263 matches the inner diameter of the opening of the inner filter cover 22, allowing the inner filter cover 22 to be inserted into the plug 263. This allows the inner filter cover 22 to rotate under fluid impact, thereby preventing impurities from clogging local filter holes, improving filtration efficiency and extending the cleaning cycle. Simultaneously, this structure also allows the inner filter cover 22 to be easily removed for cleaning or replacement during maintenance.

[0029] In addition, to ensure the stable installation of the outer filter cover 23 within the housing 21, a limiting protrusion 212 is provided on the inner sidewall of the housing 21 near the opening, and a radial extension 233 is provided at the lower end of the outer filter cover 23. When the outer filter cover 23 is installed into the housing 21, its radial extension 233 contacts the limiting protrusion 212, forming a reliable vertical limiting.

[0030] Working principle: Under system pressure, the oil to be tested enters the housing 21 tangentially through the inlet pipe 24. The oil is first guided by baffles 211 for pre-separation of impurities. Subsequently, the oil passes through the outer filter cover 23 and the inner filter cover 22 sequentially from the outside to the inside, completing two-stage filtration. The clean oil finally enters the transmitter body 1 through the outlet pipe 25 for accurate pressure measurement. During this process, impurities are trapped and settle in the sedimentation area at the bottom of the housing. The guide shroud 231 guides the impurities out of the filter holes, while the potential rotational tendency of the inner filter cover 22 further optimizes the filtration process. For maintenance, the ball valve 3 can be closed and the end cover 26 opened for thorough cleaning, making the operation extremely convenient.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-precision pressure transmitter for petrochemical applications, comprising a transmitter body (1) and a filter device (2) connected to the pressure inlet of the transmitter body (1), characterized in that: The filter device (2) includes a housing (21) and an inner filter cover (22) and an outer filter cover (23) installed inside the housing (21) with the opening facing downwards. The inner filter cover (22) is fitted inside the outer filter cover (23), and the filter holes of the inner filter cover (22) are smaller than the filter holes of the outer filter cover (23). The middle part of the housing (21) is connected and communicated with an inlet pipe (24) and an outlet pipe (25). The lower ends of the inlet pipe (24) and the outlet pipe (25) are higher than the lower end of the housing (21). The oil to be tested enters the housing (21) along the inlet pipe (24), and after being filtered by the inner and outer filter covers (22, 23), it enters the transmitter body (1) through the outlet pipe (25).

2. The high-precision petrochemical-specific pressure transmitter according to claim 1, characterized in that: Each filter hole of the outer filter cover (23) is provided with a flow guide cover (231) on the inner side. The flow guide cover (231) covers the upper end of the filter hole and is used to guide impurities in the fluid to deposit downward.

3. The high-precision petrochemical-specific pressure transmitter according to claim 1, characterized in that: The bottom of the housing (21) has an opening, and the opening is provided with a threaded end cap (26). The bottom of the end cap (26) has a drain port (261) and is fitted with a plug. The drain port (261) is located on the side of the end cap (26) near the outlet pipe (25).

4. The high-precision petrochemical-specific pressure transmitter according to claim 3, characterized in that: The end cap (26) has a bearing (262) at the bottom. The outer ring of the bearing (262) is fixed to the end cap (26), and the inner ring is fixed with a plug (263). The outer diameter of the plug (263) matches the inner diameter of the opening of the inner filter cover (22). The inner filter cover (22) can be inserted into the plug (263) and rotate accordingly.

5. The high-precision petrochemical-specific pressure transmitter according to claim 1, characterized in that: Multiple baffles (211) are evenly distributed on the inner side of the housing (21). The multiple baffles (211) are inclined against the direction of fluid flow, and one end of the baffle (211) is close to the outer wall of the outer filter cover (23).

6. The high-precision petrochemical-specific pressure transmitter according to claim 1, characterized in that: A ball valve (3) is installed on the inlet pipe (24).

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