A media filling tool for a pressure transmitter

Abstract

This utility model discloses a medium filling fixture for a pressure transmitter, comprising: a fixing assembly for fixing a transmitter base; the fixing assembly has a left clamp and a right clamp facing each other, after the transmitter base is fixed between the left and right clamps, a pressure regulating chamber can be formed between the inner side of the left clamp and the left diaphragm of the transmitter base, and between the inner side of the right clamp and the right diaphragm of the transmitter base; a metering filling assembly, comprising a measuring cylinder and a flexible tube connected to the bottom of the measuring cylinder, the surface of the measuring cylinder having graduations, and the end of the flexible tube away from the measuring cylinder being connected to the filling port of the transmitter base; and a pressure regulating assembly, which communicates with the pressure regulating chamber and can change the air pressure value of the pressure regulating chamber. The beneficial effect of this utility model is that it can accurately fill the measured medium.

Description

Technical Field

[0001] This utility model relates to the field of pressure transmitter technology, specifically to a medium filling tool for pressure transmitters. Background Technology

[0002] In the production and assembly of pressure transmitters, adding a specific medium to its sensing components or measuring chamber is an indispensable and crucial step. These media typically include inert liquids such as silicone oil and glycerin. Their function is to transmit the pressure of the measured medium evenly and stably to the transmitter's sensing element through their own pressure transmission characteristics. Simultaneously, they isolate and protect the sensing element from corrosion or high temperatures caused by the measured medium, ensuring that the pressure transmitter can accurately sense and convert pressure signals under complex operating conditions.

[0003] The applicant has designed a differential pressure transmitter, including a base and left and right templates at the left and right ends. The base has elastic diaphragms on both sides that are sealed between the base and the left and right templates. Inside the base, the left diaphragm, the measuring diaphragm, and the right diaphragm form a left medium cavity and a right medium cavity through a sealed interval. In order to accurately inject the measuring medium into the left and right medium cavities, the applicant plans to develop a medium filling tool.

[0004] This research and development concept lacks effective means to control the deformation state of the diaphragm. Because the degree of diaphragm deformation during the filling process cannot be precisely controlled, it is difficult to judge the filling status of the cavity based on the actual deformation of the diaphragm when adding media. This lack of control over diaphragm deformation directly leads to difficulties in controlling the amount of media. Insufficient media cannot transmit the pressure of the measured medium evenly and stably to the sensitive element of the transmitter through its own pressure transmission characteristics, causing measurement signal distortion, decreased sensitivity, and even measurement deviations exceeding the allowable range. Excessive media may generate additional pressure due to medium expansion during temperature changes, interfering with normal pressure measurement and potentially causing media overflow, contaminating the internal structure of the equipment or affecting the normal operation of surrounding components. Therefore, how to accurately add the measured medium has become a pressing technical problem that needs to be overcome. Utility Model Content

[0005] In view of this, the present invention provides a medium filling fixture for a pressure transmitter, which can accurately fill the measured medium.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A medium filling fixture for a pressure transmitter includes: a fixing assembly for fixing a transmitter base; the fixing assembly has a left clamp and a right clamp facing each other, after the transmitter base is fixed between the left clamp and the right clamp, the inner side of the left clamp and the left diaphragm of the transmitter base, and the inner side of the right clamp and the right diaphragm of the transmitter base can both form a pressure regulating chamber; a metering filling assembly including a measuring cylinder and a hose connected to the bottom of the measuring cylinder, the surface of the measuring cylinder having a scale value, and the end of the hose away from the measuring cylinder being used to connect to the filling port of the transmitter base;

[0008] A pressure regulating component is connected to the pressure regulating chamber and can change the air pressure value of the pressure regulating chamber.

[0009] By adopting the above structure, a pressure regulating chamber is formed by a fixed component. Combined with the scale measurement of the metering and filling component and the air pressure control of the pressure regulating component, precise control of diaphragm deformation is achieved. This fundamentally solves the problem of difficulty in controlling the amount of medium in traditional methods, ensuring accurate filling and avoiding the impact of too much or too little medium on transmitter performance.

[0010] Preferably, the fixing assembly includes a base plate and a vertical plate fixedly installed at one end of the base plate. The left clamping plate is fixedly installed at the end of the base plate away from the vertical plate. The right clamping plate is slidably disposed between the left clamping plate and the vertical plate. The right clamping plate is connected to an operating component that drives its sliding. This structure can stably fix transmitter bases of different specifications. The operating component drives the right clamping plate to slide, flexibly adjusting the clamping force and ensuring that a sealed pressure regulating chamber is formed between the left and right diaphragms and the clamping plates, providing a reliable basis for subsequent pressure regulation and diaphragm deformation control.

[0011] Preferably, two horizontally arranged guide rods are fixedly installed between the left clamping plate and the upright plate. The right clamping plate is slidably fitted onto the guide rods. The operating component includes a screw, the inner end of which is rotatably connected to the right clamping plate, the middle part of which is threadedly connected to the upright plate, and the outer end of which has a radially arranged turning hole. With the above structure, the guide rods provide guidance for the sliding of the right clamping plate, ensuring its smooth movement. The threaded connection between the screw and the upright plate enables precise positioning of the right clamping plate, and the turning hole design facilitates operation.

[0012] Preferably, the operating component includes a threaded rod parallel to the guide rod and a threaded sleeve fitted onto the threaded rod. The threaded sleeve is rotatably mounted on the upright plate, and the inner end of the threaded rod is rotatably embedded in the right clamping plate. A locking nut is also provided in the right clamping plate to limit axial displacement between the threaded rod and the right clamping plate. This structure further improves the adjustment accuracy of the right clamping plate compared to a single screw drive.

[0013] Preferably, a pad is installed on the base plate near the left clamping plate, and a V-groove is formed on the pad. This structure provides positioning and support for the transmitter base, facilitating its fixation.

[0014] Preferably, the left and right clamping plates each have grooves on their inner sides facing each other, which, together with the diaphragm on the side of the transmitter base, form the pressure regulating chamber. This structure allows for control of the deformation of the left and right diaphragms, achieving precise filling.

[0015] Preferably, an annular groove is formed around the groove, and the annular groove is used to embed a sealing ring. This structure enhances the sealing performance of the pressure regulating chamber.

[0016] Preferably, the bottom of the grooves in both the left and right clamping plates is provided with a recessed groove, and the bottom of the recessed groove is provided with a through hole extending along the thickness direction of the left and right clamping plates. The pressure regulating assembly includes an injection hose and a syringe, with the injection hose connected between the through hole and the syringe. Using this structure, the chamber pressure can be easily changed, achieving active control of diaphragm deformation.

[0017] Preferably, the outer end of the through hole is provided with a tapered opening. This structure facilitates quick connection of the injection tubing.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. By forming a pressure regulating chamber through a fixed component, combined with the active control of diaphragm deformation by the pressure regulating component and the calibration measurement of the metering and filling component, the problem of uncontrolled medium volume caused by the inability to control diaphragm deformation in traditional filling methods is completely solved. The pressure regulating component achieves accurate measurement of the medium volume through bidirectional control of positive pressure overflow and negative pressure filling, combined with pre-vacuum degassing, making operation simple and convenient.

[0020] 2. The sliding right clamp design of the fixing component can be adapted to transmitter bases of different specifications, improving the versatility of the tooling. With the operating component, it can quickly fix transmitter bases of different specifications. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the left clamping plate 12;

[0023] Figure 3 This is a schematic diagram of the right clamping plate 17;

[0024] Figure 4 This is a schematic diagram of the structure of the support base 11;

[0025] Figure 5 This is a top view after the transmitter base A is fixed.

[0026] Figure 6 For along Figure 5 Sectional view of CC;

[0027] Figure 7 For along Figure 5 A cross-sectional view of BB. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0029] Please refer to Figure 6 As shown, a left diaphragm 4 and a right diaphragm 6 are respectively installed on the left and right sides of the transmitter base A, and a measuring diaphragm 7 is installed in the middle. A left medium cavity c is located between the left diaphragm 4 and the measuring diaphragm 7, and a right medium cavity d is located between the right diaphragm 6 and the measuring diaphragm 7. A left filling hole c1 is opened at the upper part of the left medium cavity c, and a right filling hole d1 is opened at the upper part of the right medium cavity d. The medium filling fixture provided in this embodiment is for injecting silicone oil of precise mass into the left medium cavity c and the right medium cavity d. The structure of the medium filling fixture is as follows:

[0030] like Figure 1 and Figure 4 As shown, the medium filling fixture includes a fixing component 1, a metering filling component 2, and a pressure regulating component 3. The fixing component 1 is used to fix the transmitter base A, and includes a base plate 14 and vertical plates 17 and a left clamping plate 12 respectively fixedly installed at both ends of the base plate 14. A right clamping plate 13 is slidably disposed between the left clamping plate 12 and the vertical plate 17. The transmitter base A is fixed between the left clamping plate 12 and the right clamping plate 13. The right clamping plate 13 is connected to an operating component 16 that drives its sliding. A pad 11 is installed on the base plate 14 near the left clamping plate 12. The pad 11 has a V-groove 11a, which can position and support the transmitter base A, facilitating fixation. In this embodiment, two horizontally arranged guide rods 15 are fixedly installed between the left clamping plate 12 and the vertical plate 17. The right clamping plate 13 is slidably fitted onto the guide rods 15 to ensure its smooth sliding.

[0031] Option 1: As Figure 5 As shown, the operating component 16 adopts a screw structure, including a screw 164 parallel to the guide rod 15. The inner end of the screw 164 is mounted on the right clamping plate 13 by a rotatable connection, the middle part is threaded to the vertical plate 17, and the outer end is provided with a radially arranged turning hole 164a. The operator can insert a rod-shaped tool into the turning hole 164a and rotate it to drive the screw 164 to rotate, thereby causing the right clamping plate 13 to slide left and right along the guide rod 15, thus realizing the clamping and loosening operation of the transmitter base A.

[0032] Option 2: Figure 6 As shown, the operating assembly 16 includes a threaded rod 161 parallel to the guide rod 15 and a threaded sleeve 162 sleeved on the threaded rod 161. The threaded sleeve 162 is rotatably mounted on the vertical plate 17. The inner end of the threaded rod 161 is rotatably embedded in the right clamping plate 13. The locking nut 163 in the right clamping plate 13 is used to limit the axial displacement between the threaded rod 161 and the right clamping plate 13. By rotating the threaded sleeve 162, the threaded rod 161 can be moved axially, thereby driving the right clamping plate 13 to slide left and right along the guide rod 15, realizing the clamping and loosening of the transmitter base A.

[0033] like Figure 6 As shown, the metering and filling assembly 2 is used for accurate measurement and filling of silicone oil medium. It includes a measuring cylinder 22 with graduated values ​​on its surface and a flexible tube 21 connected to the bottom of the measuring cylinder 22. Before actual operation, silicone oil medium needs to be pre-filled into the measuring cylinder 22 and the flexible tube 21. During filling, the end of the flexible tube 21 away from the measuring cylinder 22 is connected to the left filling port c1 or the right filling port d1 of the transmitter base A.

[0034] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, grooves 12a are provided on the inner sides of the left clamping plate 12 and the right clamping plate 13 facing each other. After the transmitter base A is fixed between the left clamping plate 12 and the right clamping plate 13, a pressure regulating chamber b can be formed between the inner groove 12a of the left clamping plate 12 and the left diaphragm 4 of the transmitter base A, and between the inner groove 12a of the right clamping plate 13 and the right diaphragm 6 of the transmitter base A. The pressure regulating component 3 is used to change the air pressure value of the pressure regulating chamber b to achieve precise control of the medium injection amount. An annular groove 12b is provided around the groove 12a. A sealing ring 5 can be embedded in the annular groove 12b to effectively enhance the sealing performance during fitting and ensure the air pressure stability of the pressure regulating chamber b during pressure regulation. Both the left clamping plate 12 and the right clamping plate 13 have recessed grooves 12c at the bottom of their grooves 12a. A through hole 12d extending along the thickness of the clamping plate is located at the bottom of the recessed groove 12c. The pressure regulating assembly 3 includes an injection hose 31 and a syringe 32. The injection hose 31 is connected between the through hole 12d and the syringe 32, and the outer end of the through hole 12d has a tapered opening 12d1 to facilitate quick and accurate connection of the injection hose 31. Positive or negative pressure can be applied to the pressure regulating chamber b by pushing or pulling the piston of the syringe 32.

[0035] like Figure 6As shown, in this embodiment, after the left medium cavity c and the right medium cavity d are pre-evacuated, the silicone oil medium automatically fills the corresponding cavities under negative pressure, initially ensuring that the silicone oil covers the cavity space. Then, positive pressure is applied to the corresponding pressure regulating chamber b through the pressure regulating component 3, driving the corresponding diaphragm to deform to the limit position, so that the excess silicone oil flows back to the measuring cylinder 22 through the hose 21, completely expelling any air that may remain in the cavity. Finally, negative pressure is applied to the pressure regulating chamber b, the diaphragm rebounds, and the silicone oil flows back into the cavity. The backflow and injection volume are monitored in real time by the scale of the measuring cylinder 22, and the final amount of silicone oil injected is precisely controlled.

[0036] The filling method implemented by the medium filling fixture for the pressure transmitter includes the following steps:

[0037] S1: Pre-evacuate the left medium cavity c and the right medium cavity d respectively and then seal them;

[0038] S2: Fix the transmitter base A between the left clamping plate 12 and the right clamping plate 13, and make the left diaphragm 4 between the left clamping plate 12 and the right diaphragm 6 between the right clamping plate 13 form two independent pressure regulating chambers b respectively.

[0039] S3: Fill the metering and filling assembly 2 with silicone oil medium and connect the hose 21 to the right filling hole d1 of the transmitter base A. The silicone oil medium is automatically filled and fills the right medium cavity d under negative pressure.

[0040] S4: Apply positive pressure to the right pressure regulating chamber b through the pressure regulating component 3, drive the right diaphragm 6 to deform to the left to the limit position, so that the silicone oil in the right medium chamber d overflows into the measuring cylinder 22;

[0041] S5: The pressure regulating component 3 draws pressure into the right pressure regulating chamber b, causing the right diaphragm 6 to gradually rebound and reset. The silicone oil medium flows back into the right medium cavity d from the measuring cylinder 22. During this process, the amount of silicone oil injected into the right medium cavity d can be accurately known by the change in the scale of the measuring cylinder 22.

[0042] S6: Repeat steps S3-S5 to inject silicone oil medium into the left medium cavity c.

[0043] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A medium filling fixture for a pressure transmitter, characterized in that, include: A fixing assembly (1) is used to fix the transmitter base (A); the fixing assembly (1) has a left clamp (12) and a right clamp (13) facing each other. After the transmitter base (A) is fixed between the left clamp (12) and the right clamp (13), the inner side of the left clamp (12) and the left diaphragm (4) of the transmitter base (A) and the inner side of the right clamp (13) and the right diaphragm (6) of the transmitter base (A) can form a pressure regulating chamber (b); a metering and filling assembly (2) includes a measuring cylinder (22) and a hose (21) connected to the bottom of the measuring cylinder (22). The measuring cylinder (22) has a scale value on its surface. The end of the hose (21) away from the measuring cylinder (22) is used to connect to the filling hole of the transmitter base (A); A pressure regulating component (3) is connected to the pressure regulating chamber (b) and can change the air pressure value of the pressure regulating chamber (b).

2. The medium filling fixture for a pressure transmitter according to claim 1, characterized in that: The fixing component (1) includes a base plate (14) and a vertical plate (17) that is fixedly installed at one end of the base plate (14). The left clamping plate (12) is fixedly installed at the end of the base plate (14) away from the vertical plate (17). The right clamping plate (13) is slidably disposed between the left clamping plate (12) and the vertical plate (17). The right clamping plate (13) is connected to an operating component (16) that drives it to slide.

3. The medium filling fixture for a pressure transmitter according to claim 1, characterized in that: Two guide rods (15) arranged in the horizontal direction are fixedly installed between the left clamping plate (12) and the upright plate (17). The right clamping plate (13) is slidably fitted on the guide rods (15). The operating component (16) includes a screw (164). The inner end of the screw (164) is rotatably connected to the right clamping plate (13). The middle part of the screw (164) is threadedly connected to the upright plate (17). The outer end of the screw (164) is provided with a rotating hole (164a) arranged in the radial direction.

4. A medium filling fixture for a pressure transmitter according to claim 3, characterized in that: The operating component (16) includes a threaded rod (161) parallel to the guide rod (15) and a threaded sleeve rod (162) sleeved on the threaded rod (161). The threaded sleeve rod (162) is rotatably mounted on the upright plate (17). The inner end of the threaded rod (161) is rotatably embedded in the right clamping plate (13). The right clamping plate (13) is also provided with a locking nut (163), which is used to limit the axial displacement between the threaded rod (161) and the right clamping plate (13).

5. A medium filling fixture for a pressure transmitter according to claim 2, characterized in that: The base plate (14) has a pad (11) installed near the left clamping plate (12), and the pad (11) has a V-shaped groove (11a).

6. A medium filling fixture for a pressure transmitter according to claim 2, characterized in that: The left clamping plate (12) and the right clamping plate (13) are provided with grooves (12a) on their inner sides facing each other. The grooves (12a) can form the pressure regulating chamber (b) with the diaphragm on the side of the transmitter base (A).

7. A medium filling fixture for a pressure transmitter according to claim 6, characterized in that: An annular groove (12b) is provided around the groove (12a), and the annular groove (12b) is used to fit the sealing ring (5).

8. A medium filling fixture for a pressure transmitter according to claim 6, characterized in that: The bottom of the groove (12a) of the left clamp (12) and the right clamp (13) is provided with a sinkhole (12c), and the bottom of the sinkhole (12c) is provided with a through hole (12d) that runs through the thickness direction of the left clamp (12) and the right clamp (13). The pressure regulating component (3) includes an injection hose (31) and a syringe (32), and the injection hose (31) is connected between the through hole (12d) and the syringe (32).

9. A medium filling fixture for a pressure transmitter according to claim 8, characterized in that: The outer end of the through hole (12d) is provided with a tapered opening (12d1).

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