Oil filling system for flange type pressure sensor

Abstract

The utility model belongs to the technical field of sensor measurement, and particularly relates to an oil filling system for a flange type pressure sensor, which comprises a vacuum oil tank, a pressure base, a mounting base, a stirring and heating device and a vacuumizing device. The mounting base and the pressure base are hermetically assembled, an airflow channel is arranged between the mounting base and the pressure base, and the mounting base and a connecting flange on the flange type pressure sensor are hermetically mounted; a first vacuumizing pipeline is connected between the vacuumizing device and the vacuum oil tank, a second vacuumizing pipeline is connected between the vacuumizing device and the airflow channel, and the first vacuumizing pipeline, the second vacuumizing pipeline and the vacuumizing device are communicated through a three-way connector. An oil filling pipeline is further connected to the vacuum oil tank, and a first valve is arranged on the oil filling pipeline. According to the utility model, simultaneous oil filling of multiple groups of flange type pressure sensors can be realized, the problem of size limitation of a vacuum oil filling pot in the prior art is solved, and bubbles are prevented from being mixed in silicone oil filled into the flange type sensors.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor measurement, and particularly relates to an oil filling system for a flanged pressure sensor. Background Art

[0002] A flanged pressure sensor is a device that can convert a pressure signal into a standard electrical signal output. Due to its advantages of high measurement accuracy, being not easily affected by the external harsh environment, and simple installation, it is widely used in various industrial environments and process control systems such as thermal pipe networks, oil and gas transmission equipment, environmental protection equipment, and water supply and gas supply equipment.

[0003] The flanged pressure sensor adopts a thin-film isolation structure. The basic principle is to transfer the external pressure sensed by the corrugated diaphragm to the pressure chip equivalently through filling oil, etc., so as to realize the detection of pressure. And silicone oil has a small thermal temperature coefficient, does not freeze at low temperatures, does not volatilize or vaporize at high temperatures, and its viscosity changes little with temperature. Therefore, it is often used as filling oil and filled in the filling cavity of the flanged pressure sensor.

[0004] The existing methods for filling silicone oil into the flanged pressure sensor include the drip irrigation method and the immersion irrigation method. Among them, the drip irrigation method fills oil by controlling the amount and number of drops of oil dropped into the filling cavity. The oil filling speed is slow, and inevitably, trace and fine air bubbles are mixed into the dropped silicone oil, thus affecting the measurement performance of the flanged pressure sensor. The immersion irrigation method needs to evacuate the filling cavity first, and then put the flanged pressure sensor into an oil filling device, such as a vacuum oil filling pot, for a period of time. Relying on the pressure difference inside and outside the filling cavity, the silicone oil gradually flows into the filling cavity. However, the silicone oil filled by the immersion irrigation method has already mixed with air bubbles before flowing into the filling cavity, so that the silicone oil flowing into the flanged pressure sensor also mixes with air bubbles; and only relying on the pressure difference inside and outside the filling cavity to fill the silicone oil, not only the oil filling speed is slow, but also in the vacuum filling cavity, affected by the surface tension of the silicone oil, the silicone oil cannot fill into some microstructures in the filling cavity, and it is difficult to fill and immerse fully; in addition, the oil filling method of the immersion irrigation method is also limited by the size of the oil filling device, and when filling oil for a large flanged pressure sensor, the use cost also increases accordingly. Summary of the Utility Model

[0005] The utility model provides an oil filling system for a flanged pressure sensor to solve the technical problem that the silicone oil filled into the flanged pressure sensor by the prior art contains air bubbles, which affects the measurement performance of the flanged pressure sensor.

[0006] To solve the above problems, the oil filling system for a flanged pressure sensor provided by the utility model adopts the following technical solutions:

[0007] Oil filling system for flanged pressure sensor, comprising a vacuum oil tank, a pressure base, a mounting base, a stirring and heating device and a vacuum pumping device; an air flow channel communicating with each other is arranged between the mounting base and the pressure base, the mounting base and the pressure base are hermetically assembled, and the mounting base is provided with an avoidance hole communicating with the air flow channel and used for avoiding the diaphragm of the flanged pressure sensor, and the mounting base and the connecting flange on the flanged pressure sensor are hermetically fixed; a first vacuum pumping pipeline for pumping vacuum on the vacuum oil tank is connected between the vacuum oil tank and the vacuum pumping device; an oil filling pipeline for filling oil into the flanged pressure sensor mounted on the mounting base is further connected to the vacuum oil tank, and a first valve is arranged on the oil filling pipeline; a second vacuum pumping pipeline for pumping vacuum on the flanged pressure sensor is connected between the air flow channel and the vacuum pumping device; the first vacuum pumping pipeline, the second vacuum pumping pipeline and the vacuum pumping device are communicated through a three-way joint.

[0008] Further, there are multiple mounting bases, the oil filling pipeline includes an oil filling main pipeline and multiple oil filling branch pipelines connected to the oil filling main pipeline and having the same number as the mounting bases, and the first valve is arranged on the oil filling main pipeline.

[0009] Further, the oil filling main pipeline and the oil filling branch pipelines are connected through a conversion joint, the oil filling main pipeline adopts a vacuum bellows, and the oil filling branch pipelines adopt plastic hoses; the pipelines between the first vacuum pumping pipeline, the second vacuum pumping pipeline and the vacuum pumping device and the three-way joint all adopt vacuum bellows.

[0010] Further, the diameters of the pipelines between the first vacuum pumping pipeline, the second vacuum pumping pipeline and the vacuum pumping device and the three-way joint are larger than the diameter of the oil filling main pipeline.

[0011] Further, the mounting base is a necked butt welding flange, welded and connected to the pressure base, the central hole of the mounting base forms the avoidance hole, and a sealing member is arranged between the mounting base and the connecting flange.

[0012] Further, a magnetic stirring and heating device is connected to the bottom of the vacuum oil tank, and a magnetic stirring rod used in cooperation with the magnetic stirring and heating device is further installed on the vacuum oil tank.

[0013] Further, a second valve is arranged between the vacuum pumping device and the three-way valve, and a third valve is arranged on the first vacuum pumping pipeline.

[0014] The beneficial effects of the utility model are:

[0015] 1. When filling oil into the flanged pressure sensor of the present utility model, there is no need to place the flanged pressure sensor in an oil filling device such as a vacuum oil filling pot. Instead, the flanged pressure sensor can be placed outside the vacuum oil filling pot for oil filling, which solves the technical problem of the size limitation of the vacuum oil filling pot and reduces the use cost. Additionally, before oil filling, the vacuum oil tank and the flanged pressure sensor to be filled with oil can be evacuated through the first vacuum evacuation pipeline and the second vacuum evacuation pipeline, avoiding air bubbles mixed in the filled silicone oil and ensuring the measurement accuracy of the flanged pressure sensor.

[0016] 2. The present utility model can achieve simultaneous oil filling of multiple groups of flanged pressure sensors, improving the oil filling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By referring to the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 is a schematic diagram of the oil filling system for the flanged pressure sensor of the present utility model.

[0019] DESCRIPTION OF THE REFERENCE NUMERALS

[0020] 1. Flanged pressure sensor; 2. Mounting base; 3. Pressure base; 4. Vacuum evacuation device; 5. First vacuum evacuation pipeline; 6. Second vacuum evacuation pipeline; 7. Three-way joint; 8. Vacuum oil tank; 9. Magnetic stirring and heating device; 10. Magnetic stirring rod; 11. Main oil filling path; 12. Adapter; 13. Oil filling branch; 14. First valve; 15. Second valve; 16. Third valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0022] Next, various non-restrictive embodiments of the present utility model will be specifically introduced. The number of any element in the drawings is for illustration rather than limitation, and any naming is only for distinction and does not have any limiting meaning.

[0023] Next, with reference to several representative embodiments of the present utility model, the principles and spirits of the present utility model will be elaborated in detail.

[0024] Embodiment 1 of the oil filling system for a flanged pressure sensor provided by the present utility model:

[0025] As Figure 1 shown, the oil filling system for a flanged pressure sensor includes a vacuum oil tank 8, a pressure base 3, a mounting base 2, a stirring and heating device, and a vacuum pumping device 4.

[0026] The mounting base 2 is welded to the pressure base 3, and an air flow channel communicating with each other is provided therebetween. The mounting base 2 is a necked butt welding flange, and a relief hole for avoiding the diaphragm on the flanged pressure sensor 1 is formed in its central hole. The relief hole communicates with the air flow channel, and the aperture of the relief hole is larger than the size of the diaphragm of the flanged pressure sensor 1, leaving a gap for the deformation of the diaphragm during the vacuum pumping process. The number of the mounting bases 2 is set to three. The mounting base 2 is hermetically installed with the connecting flange on the flanged pressure sensor 1, and a sealing member is provided therebetween. The sealing member is a silicone rubber sealing ring. During installation, the diaphragm on the flanged pressure sensor 1 is aligned with the relief hole, and the mounting base 2 and the flanged pressure sensor 1 are fastened by a bolt and nut assembly, so that the flanged pressure sensor 1 to be filled with oil and the oil filling system form a sealed whole, facilitating the next step of vacuum pumping and oil filling.

[0027] The vacuum pumping device 4 includes a vacuum pump. A first vacuum pumping pipeline 5 for vacuum pumping the vacuum oil tank 8 is connected between the vacuum pumping device 4 and the vacuum oil tank 8, so that the vacuum pumping device 4 can pump the gas in the vacuum oil tank 8; a second vacuum pumping pipeline 6 for vacuum pumping the flanged pressure sensor 1 is connected between the vacuum pumping device 4 and the pressure base 3, so that the vacuum pumping device 4 can pump the inside of the flanged pressure sensor 1 through the second vacuum pipeline and the air flow channel. The first vacuum pumping pipeline 5 and the second vacuum pumping pipeline 6 communicate with the vacuum pumping device 4 through a three-way joint 7.

[0028] The vacuum oil tank 8 is an open device, arranged above the pressure base 3, and is composed of a tank body, a sealing gasket, a sealing cover, and fastening bolts. Silicone oil is injected into the vacuum oil tank 8, the sealing gasket is placed on the upper edge of the tank body, and the sealing cover is covered and fastened with the fastening bolts. A magnetic stirring and heating device 9 is connected to the bottom of the vacuum oil tank 8, and a magnetic stirring rod 10 used in cooperation with the magnetic stirring and heating device 9 is also installed. By stirring and heating the silicone oil in the vacuum oil tank 8, the tiny bubbles mixed in the silicone oil are discharged. Of course, in other embodiments, the stirring and heating device can also adopt devices such as an RT2 high-grade heating plate stirrer that can stir and heat liquids.

[0029] An oil filling pipeline for filling oil into a flange pressure sensor 1 installed on an installation base 2 is connected to a vacuum oil tank 8. The oil filling pipeline includes an oil filling main path 11 and an oil filling branch path 13. A first valve 14 is provided on the oil filling main path 11. The oil filling main path 11 is connected to the oil filling branch path 13 through a conversion joint 12. The number of the oil filling branch paths 13 is the same as that of the installation bases 2 and they are in one-to-one correspondence. During oil filling, the oil filling branch path 13 is hermetically connected to the oil filling hole of the flange pressure sensor 1.

[0030] The above-mentioned oil filling branch path 13 uses a plastic hose, and the pipelines between the oil filling main path 11, the first vacuum pumping pipeline 5, the second vacuum pumping pipeline 6 and the vacuum pumping device 4 and the three-way joint 7 all use vacuum bellows. Among them, the diameters of the pipelines between the first vacuum pumping pipeline 5, the second vacuum pumping pipeline 6 and the vacuum pumping device 4 and the three-way joint 7 are larger than the diameter of the oil filling main path 11. The vacuum pumping device 4 can quickly evacuate the air in the vacuum oil tank 8 and the flange pressure sensor 1.

[0031] A second valve 15 is provided between the vacuum pumping device 4 and the three-way valve, and a third valve 16 is provided on the first vacuum pumping pipeline 5. Connect the oil filling hole of the flange pressure sensor 1 to the oil filling interface, install the flange of the flange pressure sensor 1 on the installation base 2 through fastening bolts, so that the flange pressure sensor 1 is hermetically assembled in the oil filling system, and open the second valve 15 and the third valve 16, close the first valve 14, and use the stirring and heating device and the vacuum pumping device 4 to discharge the tiny bubbles mixed in the silicone oil in the vacuum oil tank 8, and evacuate the oil filling system and the flange pressure sensor 1. Then close the second valve 15 and the third valve 16. Since the position of the vacuum oil tank 8 is higher than that of the flange pressure sensor 1 installed on the installation base 2, it is possible to use the hydraulic difference and gravity to fill the flange sensor with oil through the oil filling pipeline and the oil filling branch path 13.

[0032] When filling oil into the flange pressure sensor 1 of the present utility model, it is not necessary to place the flange pressure sensor 1 in an oil filling device such as a vacuum oil filling pot. Instead, the flange pressure sensor 1 is placed outside the vacuum oil filling pot to achieve simultaneous oil filling of multiple groups of flange pressure sensors 1, which solves the problem of the limited oil filling efficiency due to the size of the vacuum oil filling pot in the prior art and improves the oil filling efficiency. Moreover, in the present utility model, the position of the vacuum oil tank 8 is higher than that of the flange pressure sensor 1, and the hydraulic difference and gravity of the silicone oil are used for oil filling, which can make the oil filling more sufficient and avoid insufficient oil filling caused by the decrease in the density of the silicone oil in the vacuum environment. At the same time, in the present utility model, before oil filling, the flange pressure sensor 1 and the oil filling system form a sealed whole, and the heating and stirring device and the vacuum pumping device 4 are used to completely discharge the bubbles mixed in the silicone oil in the vacuum oil tank 8 and the air in the sealed whole, avoiding tiny bubbles mixed in the silicone oil filled into the flange pressure sensor 1 and ensuring the measurement accuracy of the flange pressure sensor 1.

[0033] Embodiment 2 of the oil filling system for the flanged pressure sensor provided by the present utility model:

[0034] The main difference from Embodiment 1 is that:

[0035] In Embodiment 1, the number of mounting bases 2 is set to three.

[0036] In this embodiment, the number of mounting bases 2 can be set to more than three. The flanged pressure sensor 1 is hermetically mounted on the mounting base 2, and more than three flanged pressure sensors 1 can be filled with oil simultaneously. Of course, in other embodiments, only one or two mounting bases 2 can also be provided, and at this time, the oil filling system fills one or two flanged pressure sensors 1 with oil respectively.

[0037] When actually applying the present utility model, the size of the pressure base 3 can be designed according to actual needs, and the number of mounting bases 2 assembled on the pressure base 3 can be reasonably set.

[0038] In addition, in the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. Oil filling system for flange type pressure sensor, characterized in that: It includes a vacuum oil tank, a pressure base, a mounting base, a stirring and heating device and a vacuum pumping device; An air flow channel connected to each other is provided between the mounting base and the pressure base, the mounting base and the pressure base are sealed and assembled, an avoidance hole connected to the air flow channel and used to avoid the diaphragm of the flange-type pressure sensor is provided on the mounting base, and the mounting base is sealed and fixed to the connecting flange on the flange-type pressure sensor; A first vacuuming pipeline for vacuuming the vacuum oil tank is connected between the vacuum oil tank and the vacuuming device; an oil filling pipeline for filling oil into the flange-type pressure sensor installed on the mounting base is also connected to the vacuum oil tank, and a first valve is arranged on the oil filling pipeline; A second vacuum pumping pipeline for vacuuming the flange-type pressure sensor is connected between the airflow channel and the vacuum pumping device; The first vacuum pumping pipeline, the second vacuum pumping pipeline and the vacuum pumping device are connected through a three-way joint.

2. The oil filling system for flange type pressure sensor according to claim 1, characterized in that: There are multiple mounting bases, the oil filling pipeline includes an oil filling main line and multiple oil filling branches connected to the oil filling main line, the number of which is the same as the mounting bases, and the first valve is arranged on the oil filling main line.

3. The oil filling system for flange type pressure sensor according to claim 2, characterized in that: The main oil filling line and the oil filling branch line are connected by a conversion joint. The main oil filling line adopts a vacuum bellows, and the oil filling branch line adopts a plastic hose. The first vacuum pumping pipeline, the second vacuum pumping pipeline and the pipeline between the vacuum pumping device and the three-way joint all adopt vacuum bellows.

4. The oil filling system for flange type pressure sensor according to claim 3, characterized in that: The diameters of the first vacuum pumping pipeline, the second vacuum pumping pipeline, and the pipeline between the vacuum pumping device and the three-way joint are larger than the diameter of the main oil filling pipeline.

5. The oil filling system for flange type pressure sensor according to any one of claims 1 to 4, characterized in that: The mounting base is a neck butt-welding flange, which is welded to the pressure base. The central hole of the mounting base forms the avoidance hole, and a sealing member is provided between the mounting base and the connecting flange.

6. The oil filling system for a flange type pressure sensor according to any one of claims 1 to 4, characterized in that: The bottom of the vacuum oil tank is connected with a magnetic stirring and heating device, and a magnetic stirring rod used in conjunction with the magnetic stirring and heating device is also installed on the vacuum oil tank.

7. The oil filling system for a flange type pressure sensor according to any one of claims 1 to 4, characterized in that: A second valve is arranged between the vacuum pumping device and the three-way valve, and a third valve is arranged on the first vacuum pumping pipeline.

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