On-line calibrating device for pressure gauge

Abstract

The utility model discloses an on-line calibrating device for a pressure gauge, which comprises a valve body and a valve core, the left section of the valve core is in threaded connection with a valve cavity, the outer side of the valve body is respectively provided with a calibrating connector, a pressure gauge connector and a pipeline connector, and the three connectors are respectively communicated with the valve cavity of the valve body through three channels. The three channels are communicated with the valve cavity, the three channels are communicated with the valve cavity, the three channels are communicated with the valve cavity in sequence from left to right at intervals in the valve cavity, a first sealing ring and a second sealing ring which are distributed left and right at intervals are arranged on the left section of the valve element, and when the valve element is located at the left limit position in the valve cavity, the first sealing ring and the second sealing ring are located between the two sealing rings. The third interface is positioned on the right side of the second sealing ring; when the valve element is located at the right limiting position in the valve cavity, the second intersection and the third intersection are both located between the two sealing rings, and the first intersection is located on the left side of the first sealing ring. The utility model has the advantages that the on-line verification of the pressure gauge is realized, and the normal operation of a pipeline system is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure detection devices, in particular to an online calibration device for a pressure gauge. Background Art

[0002] In industrial field pipeline work, in order to monitor its operational reliability and safety, various pressure gauges are used to detect the pressure in the pipeline in real time. The pressure gauge is a pressure measuring gauge with elastic sensitive elements. At present, the main pressure measurement method used in industrial fields is to directly contact the pressure sensing part of the pressure gauge with the liquid or gas in the pipeline to measure the pipeline pressure. The accuracy of the pressure gauge is directly related to the safety and quality of the production environment, and its verification and calibration work is extremely important.

[0003] Since pressure gauges are intrusive measurements, there are some difficulties in measuring them during production operations. First, in the actual implementation of pressure gauge calibration, the disassembly and installation process around the pipeline is complicated, which can easily lead to safety hazards, especially for pressure pipelines or containers with high pressure and dangerous liquids. Disassembly inspection will bring risks to instrument inspection and maintenance personnel. Secondly, since the pressure gauge is usually directly connected to the pipeline, the pipeline and the pressure gauge need to be separated when the pressure gauge is inspected. The fluid operation of the entire equipment or production line must be shut down before the pressure gauge can be removed, which will not only cause production suspension and affect normal production, but also the inspection operation process is more cumbersome.

[0004] Based on this, some industrial sites currently use button valves or stop valves to install pressure gauges. On the one hand, they can remove the pressure gauge without stopping the pipeline operation, and on the other hand, they can protect the pressure gauge. However, the pressure gauge still needs to be removed and sent to the calibration device for calibration, that is, it is still an "offline inspection method". During this period, since there is no pressure gauge on the pipeline, the internal pressure control and detection cannot be guaranteed, which may bring risks to the safety and quality of on-site operation; secondly, it is impossible to realize online real-time calibration of the working pressure, which is inefficient. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and provides an on-line calibration device for a pressure gauge, so as to realize on-line calibration of the pressure gauge without affecting the normal operation of the pipeline system.

[0006] The utility model is realized by the following technical solutions:

[0007] A pressure gauge online calibration device comprises a valve body and a valve core, the valve core extends in the left and right directions, the left section of the valve core is located in the valve cavity of the valve body and is threadedly connected to the valve cavity, the right end of the valve core extends outward from the valve cavity outlet end of the valve body and is connected to a handle, the valve body is respectively provided with a calibration connection port, a pressure gauge connection port and a pipeline connection port, the calibration connection port, the pressure gauge connection port and the pipeline connection port are respectively connected to the valve cavity of the valve body through a first channel, a second channel and a third channel, the intersections of the first channel, the second channel and the third channel with the valve cavity are respectively the first intersection, the second intersection and the third intersection, the first channel, the second channel and the third channel are respectively the first intersection, the second intersection and the third intersection, the second channel and the third channel are respectively the second intersection and the third intersection, the second channel and the third channel are respectively the third ... The first intersection, the second intersection and the third intersection are arranged in sequence from left to right in the valve cavity, and the left section of the valve core is provided with a first sealing ring and a second sealing ring arranged in sequence from left to right. The first sealing ring and the second sealing ring are both used to seal the gap between the valve core and the valve cavity. When the valve core is located at the left extreme position in the valve cavity, the first intersection and the second intersection are both located between the two sealing rings, and the third intersection is located on the right side of the second sealing ring; when the valve core is located at the right extreme position in the valve cavity, the second intersection and the third intersection are both located between the two sealing rings, and the first intersection is located on the left side of the first sealing ring.

[0008] As a preferred embodiment of the above-mentioned online calibration device, the valve body is provided with a threaded end at the outlet end of the valve cavity, the threaded end of the valve body is externally threadedly connected to a cap, the valve core extends to the right from the center hole of the cap, and a right limiting protrusion is provided on the periphery of the valve core, and the right limiting protrusion contacts and resists the cap to limit the right limit position of the valve core in the valve cavity.

[0009] As a preferred solution of the above-mentioned online calibration device, a left limit protrusion is provided at the left end of the valve core, and the left limit position of the valve core in the valve cavity is limited by the contact and resistance between the left wall of the valve cavity and the left limit protrusion.

[0010] As a preferred solution of the above-mentioned online calibration device, the middle section of the valve core is provided with an external threaded connection section, the external threaded connection section is located between the second sealing ring and the right limiting protrusion, and the valve core is threadedly connected to the valve cavity through the external threaded connection section.

[0011] As a preferred solution of the above-mentioned online calibration device, a calibration connector for an external pressure gauge calibration device is installed at the calibration connection port of the valve body, and a pressure gauge connector used for an external pressure gauge is installed at the pressure gauge connection port.

[0012] As a preferred solution of the above-mentioned online calibration device, the calibration connection port is located on the left side of the valve body, the pressure gauge connection port is located on the top side of the valve body, and the pipeline connection port is located on the bottom side of the valve body.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model provides an on-line calibration device for a pressure gauge, by arranging a calibration connection port, a pressure gauge connection port and a pipeline connection port which are respectively connected to the valve cavity on the valve body, and arranging two left and right sealing rings on the valve core, the valve core moves in the valve cavity, and the valve core drives the two sealing rings to move together, so that in a certain state, the calibration connection port and the pipeline connection port can only be selected to be connected to the pressure gauge connection port, so that the device has two working states, namely, a "pipeline pressure detection" state and a "pressure gauge calibration" state, and can switch freely between the two working states, and the two working states do not affect each other, thereby realizing the function of on-line calibration of the pressure gauge without disassembly and inspection, simplifying the calibration process of the pressure gauge, improving the calibration efficiency, and the pressure gauge calibration process will not affect the normal operation of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a stereogram of the utility model.

[0016] Figure 2 It is a cross-sectional view of the utility model.

[0017] Figure 3 It is a cross-sectional view of the utility model in the working state of "pipeline pressure detection".

[0018] Figure 4 It is a cross-sectional view of the utility model in the working state of "pressure gauge calibration".

[0019] Numbers in the figure: 1 valve body; 2 valve core; 3 valve chamber; 4 handle; 5 calibration connection port; 6 pressure gauge connection port; 7 pipeline connection port; 8 first channel; 9 second channel; 10 third channel; 11 first sealing ring; 12 second sealing ring; 13 left limit protrusion; 14 cover cap; 15 right limit protrusion; 16 external threaded connection section; 17 calibration connector; 18 pressure gauge connector; 19 pipeline; 20 pressure gauge. DETAILED DESCRIPTION

[0020] The following is a detailed description of an embodiment of the utility model. This embodiment is implemented on the premise of the technical solution of the utility model, and a detailed implementation method and a specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0021] See also Figures 1 to 4The present embodiment discloses an online calibration device for a pressure gauge, comprising a valve body 1 and a valve core 2, the valve core 2 extending in the left-right direction, the left section of the valve core 2 being located in a valve cavity 3 of the valve body 1 and being threadedly connected to the valve cavity 3, the right end of the valve core 2 extending outward from an outlet end of the valve cavity 3 of the valve body 1 and being connected to a handle 4, a calibration connection port 5, a pressure gauge connection port 6 and a pipeline connection port 7 being respectively opened on the outside of the valve body 1, in the present embodiment, the calibration connection port 5 is located on the left side of the valve body 1, the pressure gauge connection port 6 is located on the top side of the valve body 1, and the pipeline connection port 7 is located on the bottom side of the valve body 1. The calibration connection port 5, the pressure gauge connection port 6 and the pipeline connection port 7 are connected to the valve cavity 3 of the valve body 1 through the first channel 8, the second channel 9 and the third channel 10 respectively. The intersections of the first channel 8, the second channel 9 and the third channel 10 with the valve cavity 3 are the first intersection, the second intersection and the third intersection respectively. The first intersection, the second intersection and the third intersection are arranged in sequence from left to right in the valve cavity 3. The left section of the valve core 2 is provided with a first sealing ring 11 and a second sealing ring 12 arranged in intervals on the left and right. The first sealing ring 11 and the second sealing ring 12 are both used to seal the gap between the valve core 2 and the valve cavity 3. When the valve core 2 is located at the left extreme position in the valve cavity 3, the first intersection and the second intersection are both located between the two sealing rings, and the third intersection is located on the right side of the second sealing ring 12; when the valve core 2 is located at the right extreme position in the valve cavity 3, the second intersection and the third intersection are both located between the two sealing rings, and the first intersection is located on the left side of the first sealing ring 11.

[0022] The left end of the valve core 2 is provided with a left limiting protrusion 13, and the left wall of the valve cavity 3 contacts and resists the left limiting protrusion 13, so as to limit the left limit position of the valve core 2 in the valve cavity 3. The valve body 1 is provided with a threaded end at the outlet end of the valve cavity 3, and the threaded end of the valve body 1 is externally threadedly connected with a cap 14. The valve core 2 extends to the right from the center hole of the cap 14, and the outer periphery of the valve core 2 is provided with a right limiting protrusion 15, and the right limiting protrusion 15 contacts and resists the cap 14, so as to limit the right limit position of the valve core 2 in the valve cavity 3. The middle section of the valve core 2 is provided with an external threaded connection section 16, and the external threaded connection section 16 is located between the second sealing ring 12 and the right limiting protrusion 15, and the valve core 2 is threadedly connected with the valve cavity 3 through the external threaded connection section 16.

[0023] The pipe connection port 7 of the valve body 1 is used to be connected to the pipe 19 , the calibration connection port 5 of the valve body 1 is installed with a calibration connector 17 for an external pressure gauge 20 calibration device, and the pressure gauge connection port 6 is installed with a pressure gauge connector 18 used by the external pressure gauge 20 .

[0024] By rotating the handle 4 , the valve core 2 can be rotated out to the right or rotated into the left from the valve chamber 3 of the valve body 1 .

[0025] See also Figure 3, when the right limit protrusion 15 on the periphery of the valve core 2 contacts and resists the cover cap 14, the valve core 2 is in the right limit position in the valve cavity 3. At this time, the second intersection and the third intersection are both located between the two sealing rings, and the first intersection is located on the left side of the first sealing ring 11. The device is in the "pipeline 19 pressure detection" working state. In this state, since the second intersection and the third intersection are both located between the two sealing rings, the pressure gauge connection port 6 and the pipeline connection port 7 are in a connected state, and the pressure of the pipeline 19 can be detected in real time by the pressure gauge 20 installed on the pressure gauge connector 18. At the same time, due to the sealing effect of the first sealing ring 11, the inspection connection port 5 is separated from the pressure detection channel of the pipeline 19. Even if there is no plug at the inspection connector 17, there is no risk of the gas in the pipeline 19 overflowing through the first channel 8 and the inspection connection port 5.

[0026] See also Figure 4 , when the left limit protrusion 13 at the left end of the valve core 2 contacts and resists the left wall of the valve cavity 3, the valve core 2 is in the left limit position in the valve cavity 3. At this time, the first intersection and the second intersection are both located between the two sealing rings, and the third intersection is located on the right side of the second sealing ring 12. The device is in the "pressure gauge 20 calibration" working state. In this state, since the first intersection and the second intersection are both located between the two sealing rings, the first intersection and the second intersection are connected, and the calibration connection port 5 and the pressure gauge connection port 6 are in a connected state, and the pressure gauge 20 calibration device can be connected to the calibration connector 17 to realize the online calibration of the pressure gauge 20; at the same time, due to the sealing effect of the second sealing ring 12, the pipeline connection port 7 is separated from the calibration channel, and the pressure in the pipeline 19 will not interfere with the calibration process of the pressure gauge 20.

[0027] The online calibration device for the pressure gauge 20 provided in this embodiment effectively solves the problem that the pressure gauge 20 on the pipeline 19 needs to be powered off and disassembled, and submitted to a professional organization for calibration and verification, which is complicated. It simplifies the calibration and verification process of the pressure gauge 20 and improves the calibration and verification efficiency of the pressure gauge 20. At the same time, this "online calibration method" does not require the entire set of engineering equipment to be powered off and shut down, which will not affect the production progress and is conducive to improving the calibration efficiency of the pressure gauge 20. In addition, the process of disassembling and transporting the pressure gauge 20 is omitted, which saves the labor cost of calibration and verification and the time of disassembly and inspection, reduces the risk of damage to the pressure gauge 20, and extends the service life of the pressure gauge 20.

[0028] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An online calibration device for a pressure gauge, comprising a valve body and a valve core, wherein the valve core extends in the left-right direction, the left section of the valve core is located in the valve cavity of the valve body and is threadedly connected to the valve cavity, and the right end of the valve core extends outward from the outlet end of the valve cavity of the valve body and is connected to a handle, characterized in that: The outside of the valve body is respectively provided with a calibration connection port, a pressure gauge connection port and a pipeline connection port, which are respectively connected to the valve cavity of the valve body through the first channel, the second channel and the third channel, and the intersections of the first channel, the second channel and the third channel with the valve cavity are the first intersection, the second intersection and the third intersection respectively, and the first intersection, the second intersection and the third intersection are arranged in sequence from left to right in the valve cavity, and a first sealing ring and a second sealing ring arranged in intervals on the left and right are provided on the left section of the valve core, and the first sealing ring and the second sealing ring are both used to seal the gap between the valve core and the valve cavity, and when the valve core is located at the left extreme position in the valve cavity, the first intersection and the second intersection are both located between the two sealing rings, and the third intersection is located on the right side of the second sealing ring; when the valve core is located at the right extreme position in the valve cavity, the second intersection and the third intersection are both located between the two sealing rings, and the first intersection is located on the left side of the first sealing ring.

2. The pressure gauge online calibration device according to claim 1, characterized in that: The valve body is provided with a threaded end at the outlet end of the valve cavity, and the threaded end of the valve body is externally threadedly connected to a cap. The valve core extends to the right from the center hole of the cap, and a right limiting protrusion is provided on the periphery of the valve core. The right limiting protrusion contacts and resists the cap to limit the right limit position of the valve core in the valve cavity.

3. The pressure gauge online calibration device according to claim 2, characterized in that: A left limit protrusion is provided at the left end of the valve core, and the left limit position of the valve core in the valve cavity is limited by the left wall of the valve cavity contacting and resisting the left limit protrusion.

4. The pressure gauge online calibration device according to claim 2, characterized in that: The middle section of the valve core is provided with an external thread connection section, the external thread connection section is located between the second sealing ring and the right limiting protrusion, and the valve core is threadedly connected to the valve cavity through the external thread connection section.

5. The pressure gauge online calibration device according to claim 1, characterized in that: A calibration connector for an external pressure gauge calibration device is installed at the calibration connection port of the valve body, and a pressure gauge connector for an external pressure gauge is installed at the pressure gauge connection port.

6. The pressure gauge online calibration device according to claim 1, characterized in that: The verification connection port is located on the left side of the valve body, the pressure gauge connection port is located on the top side of the valve body, and the pipeline connection port is located on the bottom side of the valve body.

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