Differential pressure flowmeter

Abstract

The invention belongs to the technical field of flowmeters, and particularly relates to a differential pressure flowmeter. Through cooperation of the pressure guide pipe bodies and the arc-shaped cleaning pieces, when fluid enters the corresponding pressure guide pipe bodies, the transmission shaft can be driven to rotate through cooperation of the arc-shaped blades, meanwhile, the arc-shaped cleaning pieces are driven to rotate in the corresponding pressure guide pipe bodies, and cleaning operation on the inner walls of the pressure guide pipe bodies is achieved; impurities adhered to the inner wall of the pressure guide pipe body are prevented from influencing the detection precision, and the detection effect of the pressure guide pipe is improved; and meanwhile, through cooperation of the sealing cover, the diaphragm body in the pressure chamber can be conveniently detached and replaced, and maintenance is convenient while the sealing performance is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid measurement, in particular to a differential pressure flowmeter. Background Art

[0002] A differential pressure flowmeter, also known as an orifice flowmeter, is a flow measurement instrument. Its principle is based on the flow stream contraction method. When a fluid passes through a throttling mechanism, the flow velocity increases, increasing the kinetic energy of the stream at that point and causing a corresponding decrease in potential energy, which in turn reduces the fluid pressure. Based on this principle, a throttling device with a specified orifice plate is installed in the conduit where the flow is to be measured. This creates a pressure differential, which is then transmitted to a differential pressure gauge via a pressure pipe. The pressure differential reading in the gauge is then used to calculate the flow rate according to a formula.

[0003] After searching, it was found that the Chinese patent with the publication number CN118654738B discloses a differential pressure flowmeter. This device has the problem that impurities in the fluid easily adhere to the inside of the device and affect the measurement accuracy. Summary of the Invention

[0004] The object of the present invention is to provide a differential pressure flowmeter to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A differential pressure flowmeter, comprising a tube body and a flowmeter body, characterized in that: a differential pressure device body is fixedly installed inside the flowmeter body, two sections of pressure guide pipe bodies are connected between the tube body and the differential pressure device body for conveying fluid, a pressure chamber is defined inside the differential pressure device body, and a diaphragm body is fixedly installed inside the pressure chamber for measuring the pressure difference of the fluid; An orifice plate body is fixedly installed inside the tube body, and the installation position of the orifice plate body is located at the center position of the connection between the two sections of the pressure-guiding tube body and the tube body. A transmission shaft is rotatably connected to the inside of the pressure-guiding tube body, and a positioning plate is rotatably installed on the outside of the transmission shaft. A connecting rod is fixedly installed on one end of the transmission shaft, and an arc-shaped cleaning piece is fixedly installed through the connecting rod. The arc-shaped cleaning piece is located inside the pressure-guiding tube body and keeps in contact with its inner wall. A plurality of arc-shaped blades are fixedly installed on the end of the transmission shaft away from the connecting rod, which is used to drive the arc-shaped cleaning piece to rotate inside the pressure-guiding tube body when fluid passes through; A protective tube is provided on the outside of the two sections of the pressure guiding tube body, and a protective component is provided between the protective tube and the two sections of the pressure guiding tube body for providing protective support to the pressure guiding tube body.

[0006] Preferably, a screen is fixedly installed on one end of the two sections of the pressure guiding pipe body close to the pipe body, and the screen is installed at an angle to block large particles of impurities.

[0007] Preferably, a rectangular groove is provided on the top of the differential pressure transmitter body, and a sealing cover is fixedly installed inside the rectangular groove. Arc-shaped grooves are provided on the sealing cover and inside the differential pressure transmitter body. An annular frame is fixedly installed on the outside of the diaphragm body, and the annular frame is fixedly installed inside the arc-shaped groove. The sealing cover is used to assemble the annular frame and the diaphragm body into the inside of the differential pressure transmitter body.

[0008] Preferably, a sealing ring is fixedly installed on the outer side of the annular frame, and positioning bolts are installed on all four sides of the inner side of the sealing cover.

[0009] Preferably, a plurality of positioning rods are fixedly installed on the bottom of the differential pressure device body.

[0010] Preferably, a collecting pipe is fixedly installed at the bottom of the differential pressure device body, a recovery channel is opened inside the differential pressure device body, the recovery channel is connected to the pressure chamber, and solenoid valves are fixedly installed at both ends of the recovery channel, the collecting pipe is connected to the recovery channel, and is used to recover and clean impurities accumulated inside the pressure chamber.

[0011] Preferably, an assembly end is fixedly installed at the end of the collecting pipe, and the assembly end is fixedly connected to the bottom of the differential pressure device body through threads.

[0012] Preferably, positioning flanges are fixedly installed at both ends of the tube body.

[0013] Preferably, a display screen is fixedly mounted on the side of the flow meter body, and an upper cover is fixedly mounted on the top of the flow meter body.

[0014] Preferably, the protective assembly includes a supporting cross bar, a fixing rod is fixedly installed inside the protective tube, and a plurality of positioning rings are fixedly sleeved on the outer side of the fixing rod. There are multiple supporting cross bars, and they are respectively fixedly installed between the positioning rings and the corresponding pressure-guiding tube bodies.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention cooperates with the pressure-guiding tube body and the arc-shaped cleaning piece. When the fluid enters the corresponding pressure-guiding tube body, the cooperation of the arc-shaped blade can drive the transmission shaft to rotate, and at the same time drive the arc-shaped cleaning piece to rotate inside the corresponding pressure-guiding tube body, thereby completing the cleaning operation of the inner wall of the pressure-guiding tube body, avoiding the impurities adhering to the inner wall of the pressure-guiding tube body from affecting the detection accuracy, and improving the detection effect of the present invention; at the same time, through the cooperation of the sealing cover, the diaphragm body inside the pressure chamber can be easily disassembled and replaced, ensuring the sealing performance while facilitating maintenance.

[0016] (2) The present invention sets a collection pipe. When the present invention stops rotating, the solenoid valve opens, which allows the impurities remaining inside the pressure chamber to enter the collection pipe through the recovery channel, thereby cleaning and collecting the impurities and ensuring the accuracy of subsequent test results. By setting a protective component, the stability and protective effect of the pressure pipe body can be further improved through the cooperation of multiple supporting cross bars. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the cross-sectional structure; Figure 3 For the present invention Figure 2 The positive structural issues diagram; Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle; Figure 5 Schematic diagram of the cross-sectional structure of the differential pressure device body and the pressure guiding pipe body of the present invention; Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at B in the middle; Figure 7 For the present invention Figure 5 Schematic diagram of the enlarged structure at C in the middle; Figure 8 It is a schematic cross-sectional structural diagram of the differential pressure device body of the present invention.

[0018] In the figure: 1. tube body; 101. positioning flange; 102. orifice plate body; 2. flowmeter body; 201. display screen; 202. upper cover; 3. pressure guide tube body; 301. transmission shaft; 302. connecting rod; 303. arc-shaped cleaning piece; 304. positioning plate; 305. arc-shaped blade; 306. screen; 4. protective tube; 5. differential pressure device body; 501. positioning rod; 502. sealing cover; 503. positioning bolt; 504. pressure chamber; 505. recovery channel; 506. solenoid valve; 507. arc-shaped notch; 508. rectangular groove; 6. fixing rod; 7. positioning ring; 701. supporting cross bar; 8. collecting pipe; 801. assembly end; 9. diaphragm body; 901. ring frame; 902. sealing ring. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1-8 The present invention provides two technical solutions, specifically including the following embodiments: Example 1 A differential pressure flowmeter includes a tube 1 and a flowmeter body 2. A differential pressure device body 5 is fixedly mounted inside the flowmeter body 2. Two sections of a pressure guiding pipe body 3 are connected between the tube 1 and the differential pressure device body 5 for conveying fluid. A pressure chamber 504 is defined within the differential pressure device body 5, and a diaphragm body 9 is fixedly mounted within the pressure chamber 504 for measuring the pressure difference of the fluid. Specifically, an orifice plate body 102 is fixedly installed inside the tube body 1. The installation position of the orifice plate body 102 is located at the center of the connection between the two sections of the pressure-guiding tube body 3 and the tube body 1. A transmission shaft 301 is rotatably connected to the inside of the pressure-guiding tube body 3. A positioning plate 304 is rotatably installed on the outside of the transmission shaft 301. A connecting rod 302 is fixedly installed at one end of the transmission shaft 301, and an arc-shaped cleaning piece 303 is fixedly installed through the connecting rod 302. The arc-shaped cleaning piece 303 is located inside the pressure-guiding tube body 3 and maintains contact with its inner wall. A plurality of arc-shaped blades 305 are fixedly installed on the end of the transmission shaft 301 away from the connecting rod 302, which are used to drive the arc-shaped cleaning piece 303 to rotate inside the pressure-guiding tube body 3 when fluid passes through. Specifically, when the fluid is not flowing, the pressures before and after the orifice plate body 102 remain substantially the same. As the fluid circulates through the tube body 1, the restriction of the cross section can accelerate the flow velocity around the orifice plate body 102. At this time, the static pressure decreases, and different values ​​can be detected by the pressure chamber 504 inside the differential pressure device body 5, resulting in a higher pressure in front of the orifice plate body 102 and a lower pressure behind the orifice plate body 102. The faster the flow velocity, the greater the drop in the pressure value around the orifice plate body 102, and the greater the measured pressure differential. Specifically, when the fluid enters the corresponding pressure-guiding tube body 3, the arc-shaped blades 305 cooperate to drive the transmission shaft 301 to rotate, and at the same time drive the arc-shaped cleaning piece 303 to rotate inside the corresponding pressure-guiding tube body 3, thereby cleaning the inner wall of the pressure-guiding tube body 3 and preventing impurities adhering to the inner wall of the pressure-guiding tube body 3 from affecting the detection accuracy, thereby improving the detection effect of the present invention. Specifically, a screen 306 is fixedly mounted on one end of each of the two sections of the pressure guiding pipe body 3 close to the pipe body 1. The screen 306 is installed at an angle to block large particles of impurities and prevent them from entering the pressure chamber 504 and contacting the diaphragm body 9, thereby improving the protective effect of the present invention and extending its service life. Specifically, a rectangular groove 508 is formed on the top of the differential pressure body 5, and a sealing cover 502 is fixedly installed inside the rectangular groove 508. An arc-shaped notch 507 is formed inside the sealing cover 502 and the differential pressure body 5. An annular frame 901 is fixedly installed on the outside of the diaphragm body 9, and the annular frame 901 is fixedly installed inside the arc-shaped notch 507. The sealing cover 502 is used to assemble the annular frame 901 and the diaphragm body 9 into the interior of the differential pressure body 5. Specifically, a sealing ring 902 is fixedly installed on the outer side of the annular frame 901, and positioning bolts 503 are installed on all four sides of the inner side of the sealing cover 502; Specifically, a plurality of positioning rods 501 are fixedly installed on the bottom of the differential pressure device body 5; Specifically, the sealing cover 502 facilitates the disassembly and replacement of the diaphragm body 9 inside the pressure chamber 504, ensuring sealing performance while facilitating maintenance. Specifically, a collection pipe 8 is fixedly installed at the bottom of the differential pressure device body 5. A recovery channel 505 is opened inside the differential pressure device body 5. The recovery channel 505 is connected to the pressure chamber 504. Solenoid valves 506 are fixedly installed at both ends of the recovery channel 505. The collection pipe 8 is connected to the recovery channel 505 for recovering and cleaning impurities accumulated inside the pressure chamber 504. Specifically, the solenoid valve 506 is an existing device, and is controlled based on an existing PLC control module, which will not be described in detail here; Specifically, when the present invention stops rotating, the solenoid valve 506 opens, allowing the impurities remaining inside the pressure chamber 504 to enter the collection pipe 8 through the recovery channel 505, thereby cleaning and collecting the impurities and ensuring the accuracy of subsequent test results. Specifically, an assembly end 801 is fixedly installed at the end of the collecting pipe 8, and the assembly end 801 is fixedly connected to the bottom of the differential pressure device body 5 through threads. Specifically, positioning flanges 101 are fixedly installed at both ends of the tube body 1; Specifically, a display screen 201 is fixedly mounted on the side of the flow meter body 2, and an upper cover 202 is fixedly mounted on the top of the flow meter body 2; Specifically, the display screen 201 is an existing device, and is controlled based on an existing PLC control module, which will not be described in detail here.

[0021] Example 2 Based on the first embodiment, specifically, a protective tube 4 is provided on the outside of the two-section pressure-guiding tube body 3, and a protective component is provided between the protective tube 4 and the two-section pressure-guiding tube body 3 for protecting and supporting the pressure-guiding tube body 3; Specifically, the protection assembly includes a support crossbar 701. A fixing rod 6 is fixedly installed inside the protection tube 4. A plurality of positioning rings 7 are fixedly sleeved on the outer side of the fixing rod 6. A plurality of support crossbars 701 are provided, and are respectively fixedly installed between the positioning rings 7 and the corresponding pressure guiding tube body 3. Specifically, by providing a protection component, the stability and protection effect of the operation of the pressure guiding tube body 3 can be further improved through the cooperation of multiple supporting cross bars 701.

[0022] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0023] The above is a detailed description of an embodiment of the present invention. However, the content is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A differential pressure flowmeter, comprising a tube (1) and a flowmeter body (2), characterized in that: A differential pressure device body (5) is fixedly installed inside the flow meter body (2); two sections of pressure guide pipe bodies (3) are connected between the pipe body (1) and the differential pressure device body (5) for conveying fluid; a pressure chamber (504) is provided inside the differential pressure device body (5), and a diaphragm body (9) is fixedly installed inside the pressure chamber (504) for measuring the pressure difference of the fluid; An orifice plate body (102) is fixedly installed inside the tube body (1), and the installation position of the orifice plate body (102) is located at the center position of the connection between the two sections of the pressure-guiding tube body (3) and the tube body (1). A transmission shaft (301) is rotatably connected inside the pressure-guiding tube body (3), and a positioning plate (304) is rotatably installed outside the transmission shaft (301). A connecting rod (302) is fixedly installed at one end of the transmission shaft (301), and an arc-shaped cleaning piece (303) is fixedly installed through the connecting rod (302). The arc-shaped cleaning piece (303) is located inside the pressure-guiding tube body (3) and keeps contact with the inner wall thereof. A plurality of arc-shaped blades (305) are fixedly installed at one end of the transmission shaft (301) away from the connecting rod (302), and are used to drive the arc-shaped cleaning piece (303) to rotate inside the pressure-guiding tube body (3) when fluid passes through. A protective tube (4) is provided outside the two-section pressure-guiding tube body (3), and a protective component is provided between the protective tube (4) and the two-section pressure-guiding tube body (3) for providing protective support for the pressure-guiding tube body (3).

2. A differential pressure flowmeter according to claim 1, characterized in that: A blocking net (306) is fixedly installed at one end of the two sections of the pressure-guiding pipe body (3) close to the pipe body (1). The blocking net (306) is installed at an angle and is used to block large particles of impurities.

3. A differential pressure flowmeter according to claim 1, characterized in that: A rectangular groove (508) is provided on the top of the differential pressure device body (5), and a sealing cover (502) is fixedly installed inside the rectangular groove (508). An arc-shaped notch (507) is provided inside the sealing cover (502) and the differential pressure device body (5). An annular frame (901) is fixedly installed on the outside of the diaphragm body (9), and the annular frame (901) is fixedly installed inside the arc-shaped notch (507). The sealing cover (502) is used to assemble the annular frame (901) and the diaphragm body (9) into the inside of the differential pressure device body (5).

4. A differential pressure flowmeter according to claim 3, characterized in that: A sealing ring (902) is fixedly mounted on the outer side of the annular frame (901), and positioning bolts (503) are mounted on all four sides of the interior of the sealing cover (502).

5. A differential pressure flowmeter according to claim 3, characterized in that: A plurality of positioning rods (501) are fixedly mounted on the bottom of the differential pressure device body (5).

6. A differential pressure flowmeter according to claim 3, characterized in that: A collecting pipe (8) is fixedly installed at the bottom of the differential pressure device body (5), and a recovery channel (505) is opened inside the differential pressure device body (5), and the recovery channel (505) is connected to the pressure chamber (504). Solenoid valves (506) are fixedly installed at both ends of the recovery channel (505). The collecting pipe (8) is connected to the recovery channel (505) and is used to recover and clean impurities accumulated inside the pressure chamber (504).

7. A differential pressure flowmeter according to claim 6, characterized in that: An assembly end head (801) is fixedly mounted on the end of the collecting pipe (8), and the assembly end head (801) is integrally connected to the bottom of the differential pressure device body (5) via a threaded connection.

8. The differential pressure flowmeter according to claim 1, characterized in that: Positioning flanges (101) are fixedly mounted on both ends of the tube body (1).

9. The differential pressure flowmeter according to claim 1, characterized in that: A display screen (201) is fixedly mounted on the side of the flow meter body (2), and an upper cover (202) is fixedly mounted on the top of the flow meter body (2).

10. The differential pressure flowmeter according to claim 1, characterized in that: The protection assembly comprises a supporting cross bar (701), a fixing rod (6) is fixedly installed inside the protection tube (4), a plurality of positioning rings (7) are fixedly sleeved on the outside of the fixing rod (6), and a plurality of supporting cross bars (701) are provided, and are respectively fixedly installed between the positioning rings (7) and the corresponding pressure guiding tube body (3).

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