Diaphragm transmission and oil filling method thereof

Abstract

The invention belongs to the technical field of measurement, and discloses a diaphragm transmission and an oil filling method thereof.The device comprises a capillary tube, one end of the capillary tube penetrates through a first connecting piece to be fixedly connected with a flange assembly, the flange assembly comprises a flange and a flange oil filling adapter, the flange oil filling adapter is arranged at one end of the flange, and the flange oil filling adapter is fixedly connected with the first connecting piece. The flange oil-filled adapter is fixedly connected with the first connecting piece, a groove is formed in the flange oil-filled adapter in the vertical direction, a steel ball and a sealing piece are arranged in the groove, the sealing piece is arranged at the lower end of the steel ball, and the upper end of the steel ball is fixedly connected with the flange oil-filled adapter through a first fixing piece; the flange oil filling adapter compresses the steel ball and the sealing piece in the groove through the first fixing piece, the steel ball is connected with the flange oil filling adapter through the first fixing piece, and the upper end of the steel ball is fixed with the flange oil filling adapter through the first fixing piece, so that the connection sealing performance and the assembly stability of the capillary tube and the flange assembly are guaranteed, and secondary oil filling can be realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measurement, and relates to a diaphragm transmitter and an oil filling method thereof. BACKGROUND

[0002] The diaphragm transmitter is widely applied to chemical industry, petroleum industry, pharmaceutical industry, food industry and the like, and is used for physically isolating a measured medium from a basic transmitter through an elastic diaphragm and filling silicon oil between the diaphragm and a sensitive element as a pressure transmission medium. When the measured medium pressure acts on the diaphragm, the diaphragm is elastically deformed, the pressure change is transmitted to the pressure sensitive element in the basic transmitter through the silicon oil, and is finally converted into a standardized electric signal proportional to the pressure.

[0003] The precision control of the existing diaphragm transmitter is difficult, if the oil filling amount is insufficient, the silicon oil cannot completely fill the cavity between the diaphragm and the sensitive element, signal attenuation or lag occurs in the pressure transmission process, and the measurement accuracy is directly affected. In addition, the flange diaphragm of the diaphragm transmitter is subjected to medium pressure, corrosion or mechanical impact for a long time, and is prone to damage such as cracking, perforation or permanent deformation. Once the flange diaphragm is damaged, the silicon oil will leak into the measured medium. If the oil filling amount is insufficient or the flange diaphragm is damaged and needs to be repaired, the whole can only be replaced and cannot be repaired again. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the present application is to provide a diaphragm transmitter and a replacement method thereof.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: The present application provides a diaphragm transmitter, which comprises a capillary tube, one end of the capillary tube is fixedly connected with a flange assembly through a first connecting piece, the flange assembly comprises a flange and a flange oil filling adapter, the flange oil filling adapter is arranged at one end of the flange and is fixedly connected with the first connecting piece, the flange oil filling adapter is provided with a groove in the vertical direction, the groove is provided with a steel ball and a sealing element, the sealing element is arranged at the lower end of the steel ball, and the upper end of the steel ball is fixedly connected with the flange oil filling adapter through a first fixing piece.

[0006] Further, the other end of the capillary tube is fixedly connected with a sensor oil filling adapter through a second connecting piece, the outer side of the capillary tube is sleeved with a bellows, both ends of the bellows are fixedly connected with a bellows block, and the bellows block is sleeved on the outer surface of the capillary tube.

[0007] Further, the lower end of the sensor oil filling adapter is provided with an oil injection pipe, and the oil injection pipe is installed in the second connecting piece.

[0008] Further, the first connecting piece is provided with an adapter, the adapter is detachably connected with the flange oil filling adapter, and the first connecting piece is fixedly connected with the capillary.

[0009] Further, a second fixing piece is arranged between the adapter and the corrugated pipe stopper, and the second fixing piece is slidably connected with the capillary.

[0010] Further, the upper end of the first fixing piece is provided with a nipple, one end of the nipple is detachably connected with the flange oil filling adapter, and the other end is connected with the oil filling equipment through a connecting pipe.

[0011] Further, the flange is provided with a flange diaphragm at the end away from the capillary, and the flange diaphragm is fixedly connected with the flange.

[0012] Further, the diameter of the first fixing piece is smaller than the diameter of the second fixing piece.

[0013] The application further provides an oil filling method of the diaphragm transmission, comprising the following steps: fixing and installing the steel ball and the sealing piece in the groove by using the first fixing piece; performing first oil injection to the diaphragm transmission through the capillary; if the oil amount of the first oil injection is less than a preset value, rotating the first fixing piece in the reverse direction; and flowing back the oil in the diaphragm transmission to the oil filling equipment through the through hole on the flange oil filling adapter and the first fixing piece.

[0014] Further, after the oil in the diaphragm transmission flows back to the oil filling equipment, the method further comprises second oil injection, and the second oil injection is injected into the diaphragm transmission through the oil injection pipe.

[0015] Compared with the prior art, the application has the following beneficial technical effects: The diaphragm transmission of the application can realize secondary oil filling, and the steel ball and the sealing piece are tightly pressed in the groove by the first fixing piece and the flange oil filling adapter, the upper end of the steel ball is fixed by the first fixing piece and the flange oil filling adapter, the sealing property and the assembly stability of the connection between the capillary and the flange assembly are guaranteed, and secondary oil filling is realized.

[0016] When the flange is damaged due to accidental collision, deformation, cracks and the like, the first connecting piece and the flange oil filling adapter are separated by the adapter, and the flange assembly is replaced. After the replacement is completed, the new flange oil filling adapter is fixed with the adapter, and the first connecting piece is sleeved at one end of the flange oil filling adapter for threaded connection, thereby reducing the maintenance time and workload, reducing the maintenance cost, and improving the utilization rate.

[0017] The diaphragm variable speed device, a flange diaphragm is arranged at the end of the capillary tube away from the capillary tube, and the flange diaphragm abuts against a force receiving part in contact with the measured medium; when the pressure of the measured medium acts on the surface of the flange diaphragm, elastic deformation proportional to the pressure is generated, the elastic deformation converts the medium pressure into a mechanical signal, and the mechanical signal is transmitted to the pressure sensitive element through the flange assembly, so that the accurate measurement of the medium pressure is realized.

[0018] The diaphragm variable speed device, a corrugated pipe is arranged outside the capillary tube, so that the capillary tube is prevented from being damaged due to deformation caused by external force collision, friction or medium pressure fluctuation. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a structural schematic diagram of the diaphragm variable speed device; Figure 2 The figure is a structural schematic diagram of the flange assembly in the embodiment of the application; Figure 3 The figure is a structural schematic diagram of the tapered joint in the embodiment of the application; Figure 4 The figure is a structural schematic diagram of the capillary tube in the embodiment of the application.

[0020] Reference signs: 1-capillary tube; 11-corrugated pipe; 2-flange assembly; 21-flange; 22-flange oil filling adapter; 23-steel ball; 24-sealing element; 25-first fixing element; 26-flange diaphragm; 3-sensor oil filling adapter; 4-corrugated pipe stopper; 5-oil injection pipe; 6-adapter; 7-second fixing element; 8-tapered joint. DETAILED DESCRIPTION

[0021] In order to enable the personnel in the technical field to better understand the application scheme, the technical scheme in the embodiment of the application will be clearly and completely described below in combination with the drawings in the embodiment of the application. Obviously, the described embodiment is only a part of the embodiment of the application, but not all the embodiments. Based on the embodiment in the application, all other embodiments obtained by the personnel in the field without creative labor should belong to the protection range of the application.

[0022] Embodiment 1 The diaphragm variable speed device, as shown in Figure 1As shown, including capillary 1, one end of the capillary 1 through the first connecting piece with flange assembly 2 fixed connection, the flange assembly 2 includes flange 21 and flange oil filling adapter 22, the flange oil filling adapter 22 is arranged at one end of the flange 21, and is fixedly connected with the first connecting piece, the flange oil filling adapter 22 is provided with a groove in the vertical direction, the groove is provided with a steel ball 23 and a sealing element 24, the sealing element 24 is arranged at the lower end of the steel ball 23, and the upper end of the steel ball 23 is fixedly connected with the flange oil filling adapter 22 through a first fixing piece 25.

[0023] Specifically, a diaphragm transmission includes a capillary 1, a flange assembly 2, a sensor oil filling adapter 3, a corrugated pipe 11, a corrugated pipe stopper 4, an adapter 6, a second fixing piece 7, a cone joint 8 and a flange diaphragm 26.

[0024] As shown in the drawings, Figure 4 The capillary 1 is fixedly connected with the flange assembly 2 through the first connecting piece at one end, and is fixedly connected with the sensor oil filling adapter 3 through the second connecting piece at the other end. In this embodiment, the first connecting piece and the second connecting piece are both screw caps. The screw cap not only has good mechanical strength, but also can realize sealing through threaded connection, and can be disassembled and maintained. The right end of the flange assembly 2 is nested in the first connecting piece. The fixed connection here is a threaded connection. The sealing effect is adjusted by controlling the tightening force to avoid leakage caused by loose connection or damage to the parts caused by over-tightening. The upper end of the second connecting piece is threadedly connected with the lower end of the sensor oil filling adapter 3.

[0025] The other end of the capillary 1 is fixedly connected with the sensor oil filling adapter 3 through the second connecting piece. The outer side of the capillary 1 is sleeved with a corrugated pipe 11. Both ends of the corrugated pipe 11 are fixedly connected with a corrugated pipe stopper 4. The corrugated pipe stopper 4 is sleeved on the outer surface of the capillary 1.

[0026] The outer side of the capillary 1 is sleeved with a corrugated pipe 11. The corrugated pipe 11 is used to protect the capillary 1 from external environment or mechanical damage. Both ends of the corrugated pipe 11 are fixedly connected with a corrugated pipe stopper 4, specifically by welding. The welding can ensure the firmness of the connection and avoid separation of the corrugated pipe 11 and the corrugated pipe stopper 4 due to vibration and other factors during long-term use. The corrugated pipe stopper 4 is sleeved on the outer surface of the capillary 1. Through the limiting action of the corrugated pipe stopper 4, the corrugated pipe 11 always maintains the wrapping state of the capillary 1, avoiding deformation and damage of the capillary 1 due to external force collision, friction or medium pressure fluctuation.

[0027] As shown in the drawings, Figure 2As shown, the flange assembly 2 comprises a flange 21 and a flange oil filling adapter 22 arranged at one end of the flange 21, one end of the flange oil filling adapter 22 is welded with the flange 21, and the other end is threadedly connected with the first connecting piece. A groove is formed in the flange oil filling adapter 22 in the vertical direction, and a steel ball 23 and a sealing element 24 are arranged in the groove from top to bottom. The sealing element 24 is a spring installed at the bottom of the groove. The spring has good elasticity and sealing performance, and can tightly fit the inner wall of the groove during oil filling by deforming itself, effectively blocking the leakage of oil.

[0028] The steel ball 23 is arranged at the upper end of the sealing element 24, and the tightening force of the first fixing piece 25 is uniformly transmitted to the sealing element 24, so that the sealing element 24 can fully deform and tightly fit the inner wall of the groove. The top end of the steel ball 23 is fixed with the flange oil filling adapter 22 through the first fixing piece 25. The tightening force of the first fixing piece 25 can press the steel ball 23 and the sealing element 24 in the groove, so that the sealing element 24 fully fits the inner wall of the groove to form a reliable sealing structure, preventing medium leakage during oil filling. In the embodiment, the first fixing piece 25 is an M8 top screw. By tightening the first fixing piece 25, the tightening force can press the steel ball 23 and the sealing element 24 in the groove, so that the sealing element 24 fully fits the inner wall of the groove to form a reliable sealing structure, ensuring that there is no leakage during oil filling, thereby ensuring the normal operation of the diaphragm transmission.

[0029] As shown in Figure 3 The upper end of the first fixing piece 25 is provided with a petcock 8, one end of the petcock 8 is detachably connected with the flange oil filling adapter 22, and the other end is connected with the oil filling equipment through a connecting pipe for oil return. When the petcock 8 is worn or the sealing performance is reduced, it can be quickly replaced without disassembling the entire flange assembly 2. In order to prevent medium leakage during oil filling or backflow, an O-shaped sealing ring is sleeved at the lower end of the petcock 8. The O-shaped sealing ring has good elasticity and can form a seal on the connecting surface of the petcock 8 and the flange oil filling adapter 22, preventing oil medium from leaking from the connecting gap, and further improving the overall sealing reliability of the device.

[0030] The first connector also includes an adapter 6, which engages with the flange oil-filled adapter 22, facilitating quick separation and connection between the flange assembly 2 and the capillary tube 1. When the flange assembly 2 or the capillary tube 1 malfunctions and requires repair or replacement, the adapter 6 can be separated from the flange oil-filled adapter 22 to operate on the faulty component individually, eliminating the need for large-scale disassembly of the entire device, significantly shortening maintenance time and improving maintenance efficiency. The adapter 6 is welded to the capillary tube 1. A second fixing member 7 is also provided between the adapter 6 and the bellows stop block 4. The second fixing member 7 is fitted onto the outer surface of the capillary tube 1 and is slidably connected to the capillary tube 1. During the operation of the diaphragm gearbox, the capillary tube 1 may experience stress concentration due to factors such as temperature changes, pressure fluctuations, or external vibrations. If the stress concentration is not effectively relieved, it will lead to fatigue damage of the capillary tube 1 over a long period of time. The second fixing member 7 can be adjusted in position along the axial direction of the capillary tube 11. During operation, when the capillary tube 11 experiences stress concentration due to various factors, the second fixing member can effectively alleviate this stress concentration and protect the capillary tube 11 from damage. In this embodiment, the second fixing member 7 is an M10 set screw.

[0031] A flange diaphragm 26 is installed at the end of flange 21 away from the flange oil-filled adapter 22. The flange diaphragm 26 is fixedly connected to flange 21 by welding to prevent relative displacement under pressure and ensure accurate pressure transmission. The flange diaphragm 26 directly abuts against the force-bearing component in contact with the measured medium. When the pressure of the measured medium acts on the surface of flange diaphragm 26, flange diaphragm 26 will produce elastic deformation proportional to the pressure magnitude. The elastic deformation converts the medium pressure into a mechanical signal, which is transmitted through the oil filled inside flange assembly 2. The oil is incompressible and can completely and accurately transmit the mechanical signal to the subsequent pressure-sensitive element, thereby achieving accurate measurement of the medium pressure.

[0032] The lower end of the sensor oil filling adapter 3 is provided with an oil filling pipe 5. The oil filling pipe 5 is nested inside the second connector. As an auxiliary oil filling channel, the oil filling pipe 5 can improve the flexibility of the oil filling operation, ensure that the oil can be evenly filled into each cavity inside the diaphragm gearbox, avoid uneven oil filling, and thus ensure the measurement accuracy of the diaphragm gearbox. The oil filling pipe 5 makes the oil filling process more controllable and reduces the generation of air bubbles or voids.

[0033] In summary, the sealing element 24 is embedded into the vertical groove of the flange oil-filled adapter 22, ensuring that the sealing element 24 is completely fitted to the bottom of the groove without any offset or tilt. Then, the steel ball 23 is placed steadily on the upper end of the sealing element 24, ensuring that the steel ball 23 is aligned with the central axis of the sealing element 24. The first fixing element 25 is tightened using a tool. As the first fixing element 25 is tightened, the steel ball 23 and the sealing element 24 are pressed and fixed in the groove. Next, the flange oil-filled adapter 22 is welded and fixed to the flange 21, and the flange diaphragm 26 is welded and fixed to the other end of the flange 21.

[0034] One end of the capillary tube 1 is passed through the first connector and secured to the flange oil-filling adapter 22 via the adapter 6 to prevent loosening. The other end of the capillary tube 1 is passed through the second connector and connected to the sensor oil-filling adapter 3 by thread. During tightening, the connection must be sealed. At the same time, the oil injection pipe 5 is nested inside the second connector to ensure that one end of the oil injection pipe 5 is connected to the internal cavity of the sensor oil-filling adapter 3.

[0035] The bellows 11 is fitted over the outside of the capillary tube 1. Then, two bellows blocks 4 are fitted over the capillary tube 1 at both ends of the bellows 11. The position of the bellows blocks 4 is adjusted so that the bellows 11 is in a naturally extended state without stretching or compression. Then, the two ends of the bellows 11 are fixedly connected to the bellows blocks 4 by welding. After welding, the second fixing part 7 and the adapter 6 are fitted over the capillary tube 1. The position of the second fixing part 7 is adjusted so that it is located between the adapter 6 and the bellows blocks 4. Then, the adapter 6 is snapped and fixed to the flange oil-filled adapter 22. Finally, the second fixing part 7 and the first connecting part are moved toward the flange oil-filled adapter 22. The first connecting part is fitted over one end of the flange oil-filled adapter 22 and threaded, completing the assembly.

[0036] After assembly, the device needs to undergo airtightness testing and pressure testing. Airtightness testing involves filling the device with gas at a certain pressure and observing the pressure changes to determine if there is any leakage. Pressure testing involves simulating the test medium at different pressures to test the accuracy of pressure transmission and measurement precision of the device.

[0037] Example 2 A method for filling a diaphragm transmission with oil includes the following steps: using a first fixing member 25 to fix a steel ball 23 and a seal 24 in a groove; filling the diaphragm transmission with oil for the first time through a capillary tube 1; if the amount of oil filled in the first time is less than a preset value, rotating the first fixing member 25 in the opposite direction; the oil in the diaphragm transmission flows back to the oil filling equipment through the through hole on the flange oil filling adapter 22 and the first fixing member 25.

[0038] Specifically, the oil filling device is connected to the oil injection pipe 5 via a connecting pipe. The oil filling device is then started, and oil is injected through the capillary tube 1 until the preset cavity is filled. After the oil filling is completed, the oil filling amount is checked. If the oil filling amount is found to be less than the preset value, such as if there are air bubbles or voids inside, oil return is performed: the first fixing member 25 is rotated in the opposite direction to loosen it. At this time, the steel ball 23 moves upward with the first fixing member 25, the pressing state of the sealing member 24 is released, and the oil will flow into the gap between the first fixing member 25 and the groove through the preset through hole on the flange oil filling adapter 22, and then flow back to the oil filling device through the pagoda connector 8 and the connecting pipe to realize the emptying of the internal medium.

[0039] After recirculation, a second oil filling is performed. The inlet end of the oil inlet pipe 5 needs to be cut. After cutting, the pipe opening is cleaned to remove burrs and impurities to prevent impurities from entering with the oil medium. The inlet end of the oil filling pipe 5 is sealed before recirculation. The oil in the oil filling equipment is re-injected into the capillary tube 1 through the connecting pipe until the oil filling volume reaches the preset standard. The oil filling pipe 5 is then sealed, and the first fixing member 25 is tightened to allow the sealing member 24 to re-form a seal, completing the oil filling repair operation. It should be noted that during the oil filling process, the first fixing member 25 needs to be pre-installed in the flange oil filling adapter 22 and pre-tightened. After the oil filling is completed, the first fixing member 25 is then completely locked to ensure sealing performance.

[0040] When the diaphragm gearbox is in use, the flange diaphragm 26 on one side of flange 21 comes into contact with the medium being measured. The pressure of the medium acts on the surface of the flange diaphragm 26, causing the flange diaphragm 26 to undergo elastic deformation proportional to the pressure. This elastic deformation transfers the oil filling the inside of flange 21 to the flange oil-filled adapter 22, and then through capillary tube 1 to the pressure-sensitive element, such as a strain gauge or piezoelectric element, at the sensor oil-filled adapter 3. After receiving the force transmitted by the deformation, the pressure-sensitive element converts the mechanical pressure signal into an electrical signal. After processing by subsequent circuitry, the electrical signal outputs a value corresponding to the measured pressure, thereby achieving accurate measurement of the medium pressure.

[0041] The bellows 11, which is fitted on the outside of the capillary tube 1, effectively isolates the external mechanical impact and corrosive media, protecting the structural integrity of the capillary tube 1; the bellows block 4 limits the displacement range of the bellows 11, preventing the bellows 11 from being damaged due to excessive stretching or compression.

[0042] When flange 21 is damaged by accidental impact, such as deformation or cracks, it can be repaired or replaced by following these steps without disassembling the entire transmission.

[0043] First, the first connector is separated from the flange oil-filled adapter 22. The first connector moves on the bellows 11, and the second fixing member 7 moves in the same direction, thereby separating the adapter 6 from the flange oil-filled adapter 22, thus replacing the flange assembly 2. The replaced flange oil-filled adapter 22 is fixed to the adapter 6. The second fixing member 7 and the first connector move in opposite directions, and the first connector is threaded onto one end of the flange oil-filled adapter 22.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

Claims

1. A diaphragm transmission, characterized in that: The assembly includes a capillary tube (1), one end of which passes through a first connector and is fixedly connected to a flange assembly (2). The flange assembly (2) includes a flange (21) and a flange oil-filled adapter (22). The flange oil-filled adapter (22) is located at one end of the flange (21) and is fixedly connected to the first connector. The flange oil-filled adapter (22) has a groove in the vertical direction. A steel ball (23) and a sealing element (24) are provided in the groove. The sealing element (24) is located at the lower end of the steel ball (23). The upper end of the steel ball (23) is fixedly connected to the flange oil-filled adapter (22) through a first fixing element (25).

2. The diaphragm transmission according to claim 1, characterized in that: The other end of the capillary tube (1) passes through the second connector and is fixedly connected to the sensor oil-filled adapter (3). A corrugated tube (11) is sleeved on the outside of the capillary tube (1). Both ends of the corrugated tube (11) are fixedly connected to the corrugated tube block (4). The corrugated tube block (4) is sleeved on the outer surface of the capillary tube (1).

3. The diaphragm transmission according to claim 2, characterized in that: The lower end of the sensor oil-filling adapter (3) is provided with an oil injection pipe (5), which is installed in the second connector.

4. The diaphragm transmission according to claim 2, characterized in that: The first connector is provided with an adapter (6), which is detachably connected to the flange oil-filled adapter (22), and the first connector is fixedly connected to the capillary tube (1).

5. The diaphragm transmission according to claim 4, characterized in that: A second fixing member (7) is provided between the adapter (6) and the bellows block (4), and the second fixing member (7) is slidably connected to the capillary (1).

6. The diaphragm transmission according to claim 1, characterized in that: The upper end of the first fixing member (25) is provided with a pagoda connector (8). One end of the pagoda connector (8) is detachably connected to the flange oil filling adapter (22), and the other end is connected to the oil filling equipment through a connecting pipe.

7. The diaphragm transmission according to claim 1, characterized in that: A flange diaphragm (26) is provided at the end of the flange (21) away from the capillary tube (1), and the flange diaphragm (26) is fixedly connected to the flange (21).

8. The diaphragm transmission according to claim 4, characterized in that: The diameter of the first fastener (25) is smaller than the diameter of the second fastener (7).

9. A method for filling a diaphragm transmission with oil, characterized in that, Includes the following steps: The steel ball (23) and the seal (24) are fixedly installed in the groove using the first fastener (25); The first oil injection is performed into the diaphragm transmission through the capillary tube (1); If the amount of oil added during the first filling is less than the preset value, the first fixing member (25) will be rotated in the opposite direction. The oil in the diaphragm transmission flows back to the oil filling equipment through the through hole on the flange oil filling adapter (22) and the first fixing member (25).

10. The oil filling method for a diaphragm transmission according to claim 9, characterized in that: After the oil in the diaphragm transmission flows back to the oil filling device, a second oil injection is also included, which is injected into the diaphragm transmission through the oil injection pipe (5).

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