Diaphragm pressure transmitter detection probe

Abstract

The utility model discloses a detection probe of diaphragm pressure transmitter relates to the field of measuring fluid pressure, solves the problem that the existing detection probe can not both flush the diaphragm clean, and can also flush the material to be measured in the measuring tube out. The utility model adopts the technical scheme: the detection probe of diaphragm pressure transmitter, including the measuring tube, and the measuring tube is double -layer structure, and the double -layer structure includes inner tube and outer tube, and one end fixed mounting of outer tube has the diaphragm and is blind end, and the other end of outer tube is open end, and inner tube is fixedly installed in the inside of outer tube, and the ring cavity is formed between inner tube and outer tube, and the one end of inner tube near the blind end of outer tube is retracted in the outer tube, and the one end of inner tube near the open end of outer tube is sealedly connected with outer tube, and outer tube is equipped with a flushing hole also, and flushing hole is communicated with ring cavity. The washing water is through the flushing air and enters the ring cavity, and directly flushes the diaphragm and flows into the inner chamber of inner tube, and makes the material to be measured (slurry) in the inner chamber of inner tube from the open end of outer tube and gushes out.

Description

Technical Field

[0001] This utility model relates to the field of fluid pressure measurement, specifically a detection probe for a diaphragm pressure transmitter. Background Technology

[0002] Diaphragm pressure transmitters are suitable for measuring the pressure of slurries. A diaphragm pressure transmitter consists of a detection probe and a transmitter body connected by a connecting pipe. The detection probe includes a measuring tube, with a diaphragm fixedly mounted at one end (a blind end) and the other end open. When the detection probe is inserted into the material to be measured (slurry), the diaphragm deforms under the pressure of the slurry. This deformation is transmitted to the transmitter body, ultimately yielding the slurry pressure. Slurry easily adheres to and accumulates on the diaphragm, reducing detection accuracy; therefore, the diaphragm needs to be cleaned regularly. Currently, rinsing with cleaning water is generally used. The traditional rinsing method involves directly rinsing the open end of the measuring tube. However, due to the length of the measuring tube and the blind end at the other end, the rinsing water cannot reach all parts of the diaphragm, resulting in unsatisfactory rinsing. Often, the detection probe needs to be disassembled and the diaphragm manually cleaned, increasing the workload.

[0003] Patent CN 213793079 U discloses a cleaning device for a single-flange pressure transmitter. The device includes a flange with several guide holes on its circumferential surface communicating with the inner ring of the flange. A nozzle is fixed on the inner ring of the flange, corresponding to the outlet of each guide hole. The nozzles periodically spray process water to flush crystals on the diaphragm, achieving online automatic cleaning. The high pressure of the process water sprayed from the nozzles allows for precise flushing of the diaphragm, ensuring it is thoroughly cleaned. However, the flange is filled with the test material (slurry), while the flow rate of the process water is small, resulting in low pressure after release from the nozzles, which is insufficient to flush out the test material from the flange. Utility Model Content

[0004] This invention provides a detection probe for a diaphragm pressure transmitter, which solves the problem that existing detection probes cannot both clean the diaphragm and flush out the material to be tested from the measuring tube.

[0005] The technical solution adopted in this utility model is as follows: the detection probe of the diaphragm pressure transmitter includes a measuring tube, which has a double-layer structure, including an inner tube and an outer tube. One end of the outer tube is fixedly installed with a diaphragm and is a blind end, while the other end of the outer tube is an open end. The inner tube is fixedly installed inside the outer tube, and an annular cavity is formed between the inner tube and the outer tube. The end of the inner tube near the blind end of the outer tube is recessed into the outer tube, and the end of the inner tube near the open end of the outer tube is sealed to the outer tube. The outer tube is also provided with a flushing hole, and a flushing connector is connected to the flushing hole, which is connected to the annular cavity.

[0006] To ensure that the rinsing water evenly rinses the diaphragm from a 360° direction, the centerline of the outer tube is further aligned with the centerline of the inner tube.

[0007] The inward reduction of the end of the inner tube near the diaphragm compared to the end of the outer tube connected to the diaphragm should be moderate. Specifically: the inward reduction length of the end of the inner tube near the diaphragm compared to the blind end of the outer tube should be 10mm to 20mm.

[0008] Specifically: the outer diameter of the outer tube is 80mm to 120mm, and the outer diameter of the inner tube is 70mm to 80mm.

[0009] To further reduce the risk of blockage in the annular cavity formed by the inner and outer tubes, the flushing holes are arranged tangentially to the annular cavity.

[0010] To facilitate the installation and fixation of the diaphragm, specifically: the blind end of the outer tube is equipped with a flange, which is connected to the blind end flange by connecting bolts, and the diaphragm is fixedly installed between the flange and the blind end flange.

[0011] To facilitate the fixed installation of the inner tube inside the outer tube and ensure the stability of the inner tube relative to the outer tube, a first fixing ring is provided between the outer tube and the inner tube. The first fixing ring is located at the end of the inner tube away from the diaphragm. The inner diameter of the first fixing ring is the same as the outer diameter of the inner tube. The first fixing ring is fixedly connected to the inner tube. The outer diameter of the first fixing ring is the same as the inner diameter of the outer tube. The first fixing ring is fixedly connected to the outer tube.

[0012] To further improve the stability of the inner tube relative to the outer tube, a second fixing ring is provided between the outer tube and the inner tube. The second fixing ring is located at the end of the inner tube near the blind end of the outer tube. The inner diameter of the second fixing ring is the same as the outer diameter of the inner tube. The second fixing ring is fixedly connected to the inner tube. The outer diameter of the second fixing ring is the same as the inner diameter of the outer tube. The first fixing ring is fixedly connected to the outer tube. The second fixing ring is also provided with connecting holes along the circumferential direction to connect the ring cavity and the inner cavity of the inner tube.

[0013] To further improve the flushing effect of the flushing water on the diaphragm, the connecting hole of the second fixing ring is arranged at an angle relative to the center line of the inner and outer tubes.

[0014] To prevent the material to be tested from entering the ring cavity through the connecting hole of the fixed ring in the inner tube, a one-way valve is further provided at the connecting hole of the second fixed ring.

[0015] The beneficial effects of this invention are as follows: Flushing water enters the annular cavity formed by the inner tube and the outer pipe through the flushing connector. Because the end of the inner tube near the blind end of the outer pipe is recessed within the outer pipe, and the end of the inner tube near the open end of the outer pipe is sealed to the outer pipe, the flushing water in the annular cavity, under the pressure of the flushing water, directly flushes the diaphragm from a 360° direction and flows into the inner cavity of the inner tube. The annular cavity formed by the inner tube and the outer pipe has a large space, and the annular cavity is directly connected to the inner cavity of the inner tube at the diaphragm. Therefore, a large amount of flushing water can enter the annular cavity through the flushing hole, then enter the inner cavity of the inner tube, causing the test material (slurry) in the inner cavity of the inner tube to gush out from the open end of the outer pipe, thereby ensuring the flushing effect on the diaphragm. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a detection probe of the diaphragm pressure transmitter of this utility model.

[0017] Reference numerals: Inner pipe 1, Outer pipe 2, Diaphragm 3, Flushing joint 4, Flange 5, Connecting bolt 6, Blind end flange 7, First retaining ring 8, Second retaining ring 9. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, the detection probe of the diaphragm pressure transmitter of this utility model includes a measuring tube, which has a double-layer structure, comprising an inner tube 1 and an outer tube 2. One end of the outer tube 2 is fixedly fitted with a diaphragm 3 and is a blind end, meaning that end is closed by the diaphragm 3; the other end of the outer tube 2 is an open end, meaning that end is in an open state. Figure 1 In the illustrated embodiment, the left end of the outer tube 2 is a blind end, and the right end of the outer tube 2 is an open end. To facilitate the installation and fixation of the diaphragm 3, as shown... Figure 1 As shown, the blind end of the outer pipe 2 is provided with a flange 5. The outer pipe 2 and the flange 5 are generally an integral unit. The flange 5 is connected to the blind end flange 7 by connecting bolts 6. The diaphragm 3 is fixedly installed between the flange 5 and the blind end flange 7. After the connecting bolts 6 are tightened, the diaphragm 3 is fixed between the flange 5 and the blind end flange 7 and closes the blind end of the outer pipe 2.

[0020] The inner tube 1 is fixedly installed inside the outer tube 2, forming an annular cavity between them. This cavity is specifically formed by the outer wall of the inner tube 1 and the inner wall of the outer tube 2. The centerline of the outer tube 2 may or may not coincide with the centerline of the inner tube 1. The end of the inner tube 1 closest to the blind end of the outer tube 2 is recessed within the outer tube 2; that is, at the blind end of the outer tube 2, the inner tube 1 is shorter than the outer tube 2. The end of the inner tube 1 closest to the open end of the outer tube 2 is sealed to the outer tube 2. This end of the inner tube 1 closest to the blind end of the outer tube 2 forms the only outlet of the annular cavity, and this outlet leads to the inner cavity of the inner tube 1. The outer tube 2 also has a flushing hole, which communicates with the annular cavity. The flushing hole is the only channel for flushing water to enter the annular cavity. A flushing connector 4 is connected to the flushing hole for connecting an external flushing water pipe. The centerline of the flushing hole generally intersects with and is perpendicular to the centerline of the outer tube 2. To reduce the risk of blockage in the annular cavity formed by the inner tube 1 and the outer tube 2, the flushing hole is arranged tangentially to the annular cavity. The flushing water creates a vortex after entering the annular cavity, which not only easily flushes out solid impurities in the annular cavity, but also improves the flushing effect on the diaphragm.

[0021] The flushing water enters the annular cavity formed by the inner tube 1 and the outer tube 2 through the flushing connector 4 and the flushing hole. The flushing water directly flushes the diaphragm 3 from the end of the inner tube 1 near the blind end of the outer tube 2 in a 360° direction, and then flows into the inner cavity of the inner tube 1. Finally, the material to be tested (slurry) in the inner cavity of the inner tube 1 flows out from the open end of the outer tube 2.

[0022] To ensure that the flushing water evenly flushes the diaphragm 3 from a 360° angle, the centerline of the outer tube 2 coincides with the centerline of the inner tube 1. If the inward reduction of the end of the inner tube 1 near the diaphragm 3 relative to the blind end of the outer tube 2 is too small, the flushing water will not easily enter the inner cavity of the inner tube 1 from the annular cavity; if the inward reduction of the end of the inner tube 1 near the diaphragm 3 relative to the blind end of the outer tube 2 is too large, the flushing water can easily enter the inner cavity of the inner tube 1 from the annular cavity formed by the inner tube 1 and the outer tube 2, but the flushing water cannot fully flush the diaphragm 3. Therefore, the inward reduction of the end of the inner tube 1 near the diaphragm 3 relative to the blind end of the outer tube 2 should be moderate. Generally, the inward reduction length of the end of the inner tube 1 near the diaphragm 3 relative to the blind end of the outer tube 2 is 10mm to 20mm.

[0023] To ensure the detection accuracy of the detection probe, the diaphragm 3 needs to have a sufficiently large diameter, and the outer diameter of the outer tube 2 is generally 80mm to 120mm. To ensure that the annular cavity formed by the inner tube 1 and the outer tube 2 has a sufficiently large flow area to the inner cavity of the inner tube 1, the outer diameter of the inner tube 1 is 70mm to 80mm.

[0024] The inner tube 1 is fixedly installed inside the outer tube 2. The outer diameter of the inner tube 1 is smaller than the inner diameter of the outer tube 2. To facilitate the installation of the inner tube 1 and ensure its stability relative to the outer tube 2, the outer tube 2 and the inner tube 1 can be fixed together using other objects. See, for example... Figure 1A first fixing ring 8 is provided between the outer tube 2 and the inner tube 1. The inner diameter of the first fixing ring 8 is the same as the outer diameter of the inner tube 1, and the outer diameter of the first fixing ring 8 is the same as the inner diameter of the outer tube 2. The first fixing ring 8 is actually a section of pipe, and it is fixedly connected to the inner tube 1, for example, by welding. The first fixing ring 8 is also fixedly connected to the outer tube 2, for example, by welding. The welding connection between the first fixing ring 8 and the inner tube 1, and the welding connection between the first fixing ring 8 and the outer tube 2, ensures both the stability of the connection and the sealing of the connection. The first fixing ring 8 is located at the end of the inner tube 1 away from the diaphragm 3. The first fixing ring 8 has a certain length, and the end of the inner tube 1 near the diaphragm 3 can be suspended. The first fixing ring 8 ensures the stability of the inner tube 1 within the outer tube 2. The length direction of the first fixing ring 8 is consistent with the direction of its center line.

[0025] To improve the stability of the inner tube 1 relative to the outer tube 2, the main focus is on improving the stability of the end of the inner tube 1 closest to the diaphragm 3, such as... Figure 1 As shown, a second fixing ring 9 can also be provided between the outer tube 2 and the inner tube 1. The second fixing ring 9 is located at the end of the inner tube 1 near the blind end of the outer tube 2, and serves to fix the inner tube 1. The inner diameter of the second fixing ring 9 is the same as the outer diameter of the inner tube 1, and the second fixing ring 9 is fixedly connected to the inner tube 1, for example, by welding. The outer diameter of the second fixing ring 9 is the same as the inner diameter of the outer tube 2, and the first fixing ring 8 is fixedly connected to the outer tube 2, for example, by welding. The second fixing ring 9 is also provided with connecting holes along the circumferential direction, connecting the annular cavity and the inner cavity of the inner tube 1. The connecting holes serve to connect the annular cavity and the inner cavity of the inner tube 1. There are generally multiple connecting holes, and they are arranged at intervals along the circumferential direction of the second fixing ring 9. The center line of the connecting hole can be parallel to the center line of the inner tube 1. In order to improve the flushing effect of the flushing water on the diaphragm 3, the connecting holes are arranged at an angle relative to the center lines of the inner tube 1 and the outer tube 2. After the flushing water enters the inner cavity of the inner tube 1 from the annular cavity through the connecting holes, it will generate a vortex. To prevent the material to be tested in the inner cavity of the inner tube 1 from entering the ring cavity through the connecting hole of the fixed ring, a one-way valve is also provided at the connecting hole of the second fixed ring 9. The one-way valve does not affect the flow of flushing water out of the ring cavity and the flushing of the diaphragm 3.

Claims

1. A detection probe for a diaphragm pressure transmitter, including a measuring tube, characterized in that: The measuring tube has a double-layer structure, which includes an inner tube (1) and an outer tube (2). One end of the outer tube (2) is fixedly installed with a diaphragm (3) and is a blind end. The other end of the outer tube (2) is an open end. The inner tube (1) is fixedly installed inside the outer tube (2). An annular cavity is formed between the inner tube (1) and the outer tube (2). The end of the inner tube (1) near the blind end of the outer tube (2) is recessed into the outer tube (2). The end of the inner tube (1) near the open end of the outer tube (2) is sealed to the outer tube (2). The outer tube (2) is also provided with a flushing hole. A flushing connector (4) is connected to the flushing hole, and the flushing hole is connected to the annular cavity.

2. The detection probe for the diaphragm pressure transmitter as described in claim 1, characterized in that: The centerline of the outer tube (2) coincides with the centerline of the inner tube (1).

3. The detection probe for the diaphragm pressure transmitter as described in claim 1, characterized in that: The inner tube (1) is 10mm to 20mm shorter than the blind end of the outer tube (2) at the end closest to the diaphragm (3).

4. The detection probe for the diaphragm pressure transmitter as described in claim 1, characterized in that: The outer diameter of the outer tube (2) is 80mm to 120mm, and the outer diameter of the inner tube (1) is 70mm to 80mm.

5. The detection probe for the diaphragm pressure transmitter as described in claim 1, characterized in that: The flushing holes are arranged along the tangential direction of the annular cavity.

6. The detection probe for the diaphragm pressure transmitter as described in claim 1, characterized in that: The blind end of the outer tube (2) is provided with a flange (5), which is connected to the blind end flange (7) by connecting bolts (6). The diaphragm (3) is fixedly installed between the flange (5) and the blind end flange (7).

7. The detection probe for the diaphragm pressure transmitter as described in any one of claims 1 to 6, characterized in that: A first fixing ring (8) is provided between the outer tube (2) and the inner tube (1). The first fixing ring (8) is located at the end of the inner tube (1) away from the diaphragm (3). The inner diameter of the first fixing ring (8) is the same as the outer diameter of the inner tube (1). The first fixing ring (8) is fixedly connected to the inner tube (1). The outer diameter of the first fixing ring (8) is the same as the inner diameter of the outer tube (2). The first fixing ring (8) is fixedly connected to the outer tube (2).

8. The detection probe for the diaphragm pressure transmitter as described in claim 7, characterized in that: A second fixing ring (9) is provided between the outer tube (2) and the inner tube (1). The second fixing ring (9) is located at one end of the inner tube (1) near the blind end of the outer tube (2). The inner diameter of the second fixing ring (9) is the same as the outer diameter of the inner tube (1). The second fixing ring (9) is fixedly connected to the inner tube (1). The outer diameter of the second fixing ring (9) is the same as the inner diameter of the outer tube (2). The first fixing ring (8) is fixedly connected to the outer tube (2). The second fixing ring (9) is also provided with a connecting hole between the connecting ring cavity and the inner cavity of the inner tube (1) at intervals along the circumferential direction.

9. The detection probe for the diaphragm pressure transmitter as described in claim 8, characterized in that: The connecting hole of the second fixing ring (9) is arranged at an angle relative to the center lines of the inner tube (1) and the outer tube (2).

10. The detection probe for the diaphragm pressure transmitter as described in claim 8, characterized in that: A one-way valve is also provided at the connecting hole of the second fixing ring (9).

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