A valve capable of online leakage diagnosis

Abstract

The present invention discloses a valve capable of online diagnosing leakage, which comprises a valve body, a gate plate and a valve seat. The valve body includes the valve seat. The gate plate is detachably installed on the valve seat. The valve seat has a first annular protrusion and a second annular protrusion on the surface facing the gate plate. The surface of the first annular protrusion facing the gate plate has a first sealing surface, and the surface of the second annular protrusion facing the gate plate has a second sealing surface. A sealed space is formed between the gate plate and the first sealing surface and the second sealing surface. A pressure guiding mechanism and a detecting device are arranged on the valve body. The detecting device is located outside the valve body and is connected with the pressure guiding mechanism. The pressure guiding mechanism is used for continuously guiding the pressure in the sealed space to the outside of the valve body so that the detecting device can detect the pressure. The present invention can solve the problem in the prior art that by attaching strain gauges on the valve stem to collect the working data of the valve, it is impossible to judge whether there is internal leakage in the valve.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to a valve capable of online leakage diagnosis. Background Art

[0002] With the continuous improvement of industrial modernization, the requirements for automatic control are becoming increasingly strict. In chemical production and thermoelectric industries, there are many high-temperature, high-pressure, flammable, explosive, and toxic and harmful media. In these highly automated industries, in order to prevent valve leakage and promptly stop the occurrence of serious accidents, it is necessary to monitor the condition of the valves and, if necessary, conduct disassembly and overhaul.

[0003] In the industry, strain gauges are often attached to the valve stem to collect the working data of the valve and form a relationship diagram between the stroke and the driving force. Staff can determine whether the valve is working properly by the abnormality of the driving force, but it is impossible to judge whether the valve has internal leakage. Summary of the Invention

[0004] To overcome the above disadvantages, the purpose of the present invention is to provide a valve capable of online leakage diagnosis.

[0005] To achieve the above purpose, the present invention includes a valve body, a gate plate, and a valve seat. The valve body includes the valve seat. The gate plate is detachably installed on the valve seat. The valve seat has a first annular protrusion and a second annular protrusion on the surface facing the gate plate. The second annular protrusion is located inside the first annular protrusion. There is an annular groove between the first annular protrusion and the second annular protrusion. The surface of the first annular protrusion facing the gate plate has a first sealing surface, and the surface of the second annular protrusion facing the gate plate has a second sealing surface. After the gate plate completely coincides with the valve seat, a closed space is formed between the gate plate and the first sealing surface and the second sealing surface. A pressure guiding mechanism and a detection device are provided on the valve body. The detection device is located outside the valve body and is connected to the pressure guiding mechanism. The pressure guiding mechanism is used to continuously export the pressure in the closed space to the outside of the valve body so that the detection device can detect the pressure.

[0006] In the preferred technical solution of the above valve capable of online leakage diagnosis, the pressure guiding mechanism is a first pressure guiding hole and a second pressure guiding hole opened on the valve body. The first end of the first pressure guiding hole communicates with the closed space, and its second end penetrates through the valve body and is located inside the valve body. The second pressure guiding hole horizontally penetrates the valve body. The second pressure guiding hole has an inner end and an outer end. The second end of the first pressure guiding hole and the inner end of the second pressure guiding hole are connected by a pressure guiding pipe.

[0007] In the preferred technical solution of the above-mentioned valve capable of online leakage diagnosis, the pressure-conducting mechanism is a through hole opened on the valve body, one end of the through hole is connected to the annular groove, and the other end is arranged through the outer surface of the valve body.

[0008] In the preferred technical solution of the above-mentioned valve capable of online leakage diagnosis, the detection device includes a pressure sensor and a wire connected thereto.

[0009] In the preferred technical solution of the above-mentioned valve capable of online leakage diagnosis, a first connecting piece is installed on the second end of the first pressure-conducting hole, a second connecting piece is installed on the inner end of the second pressure-conducting hole, and both ends of the pressure-conducting tube are respectively connected to the first connecting piece and the second connecting piece.

[0010] In the preferred technical solution of the above-mentioned valve capable of online leakage diagnosis, the pressure-conducting pipe is a stainless steel pipe.

[0011] In the preferred technical solution of the above-mentioned valve capable of online leakage diagnosis, the pressure-conducting tube is a bellows.

[0012] The beneficial effect of the present invention is that the pressure parameter changes in the closed space formed by the gate sealing surface and the first sealing surface and the second sealing surface are transmitted to the pressure sensor through the first pressure conducting hole, the pressure conducting pipe and the second pressure conducting pipe. The pressure sensor transmits the pressure parameter changes to the intelligent detection system via the wire, and judges the effectiveness of the first sealing surface and the second sealing surface by artificially combining the data, so as to effectively monitor whether the valve has internal leakage, which makes up for the defect of the prior art that the working data of the valve is collected by sticking a strain gauge on the valve stem but whether the valve has internal leakage can not be judged. In addition, the present application has a simple structure, does not affect the normal operation of the valve, and has practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a cross-sectional view of the first embodiment of the present invention;

[0014] Figure 2 for Figure 1 A partial enlarged view of the middle part;

[0015] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;

[0016] Figure 4 This is a schematic diagram of a valve body cut open according to a first embodiment of the present invention;

[0017] Figure 5 for Figure 4 A partial enlarged view of point C in the middle;

[0018] Figure 6 It is a partial cross-sectional view of the second embodiment of the present invention;

[0019] In the figure: valve body 1, valve cover 2, bolt 3, valve seat 4, valve stem 5, gate plate 6, gate plate sealing surface 7, first ring projection 8, second ring projection 9, first sealing surface 81, second sealing surface 82, annular groove 10, first pressure guiding hole 11, second pressure guiding hole 12, first connecting member 13, second connecting member 14, pressure guiding pipe 15, pressure sensor 16, wire 17, through hole 18. Specific embodiments

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0021] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0022] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "arranged", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment 1:

[0024] Refer to Figures 1-5, a valve capable of online diagnosing leakage according to the present invention includes a valve body 1 and a valve cover 2. The valve body 1 and the valve cover 2 are connected by bolts 3. There is a valve seat 4 inside the valve body 1. A valve rod 5 is rotatably connected to the valve cover 2 by threads. A gate plate 6 is rotatably connected to the lower part of the valve rod 5. Both sides of the gate plate 6 have gate plate sealing surfaces 7. The valve rod 5 can drive the gate plate 6 to separate or fit onto the valve seat 4. The valve seat 4 has a first ring protrusion 8 and a second ring protrusion 9 on both surfaces facing the gate plate 6. Both the first ring protrusion 8 and the second ring protrusion 9 are circular rings and protrude towards the gate plate 6. The second ring protrusion 9 is located inside the first ring protrusion 8. The first ring protrusion 8 has a first sealing surface 81 on the side facing the gate plate sealing surface 7. The second ring protrusion 9 has a second sealing surface 82 on the side facing the gate plate sealing surface 7. There is an annular groove 10 between the first ring protrusion 8 and the second ring protrusion 9 on the valve seat 4. When the gate plate 6 is completely fitted into the valve seat 4, the gate plate sealing surface 7 is completely attached to the first sealing surface 81 and the second sealing surface 82, so that a sealed space is formed between the gate plate 6 and the first ring protrusion 8 and the second ring protrusion 9. The valve body 1 is provided with a first pressure guiding hole 11 and a second pressure guiding hole 12. The first pressure guiding hole 11 is composed of a horizontal part and a vertical part. The first pressure guiding hole 11 has a first end and a second end. The first end of the first pressure guiding hole 11 penetrates the inner wall of the annular groove 10 and communicates with the above-mentioned sealed space. The second end of the first pressure guiding hole 11 penetrates the surface of the valve body 1. The second end of the first pressure guiding hole 11 is located inside the valve body 1. The second pressure guiding hole 12 horizontally penetrates the valve body 1. The second pressure guiding hole 12 has an inner end and an outer end. The inner end of the second pressure guiding hole 12 is located inside the valve body 1. The outer end of the second pressure guiding hole 12 is located outside the valve body 1. A first connector 13 is hermetically installed on the second end of the first pressure guiding hole 11. A second connector 14 is hermetically installed on the inner end of the second pressure guiding hole 12. The first connector 13 and the second connector 14 are connected by a pressure guiding pipe 15 to improve the sealing performance of the connection between the pressure guiding pipe 15 and the first pressure guiding hole 11 and the second pressure guiding hole 12. A pressure sensor 16 is connected to the outer end of the second pressure guiding hole 12. A wire 17 is connected to the pressure sensor 16. The other end of the wire 17 is connected to an external intelligent detection system. The intelligent detection system is used to detect the pressure change value of the pressure sensor 16. The wire 17 is used to supply power to the pressure sensor 16 and transmit the pressure parameter in the sealed space measured by the pressure sensor 16 to the intelligent detection system.

[0025] When the gate plate 6 is completely fitted inside the valve seat 4, at this time, one side of the first sealing surface 81 is at high pressure and one side of the second sealing surface 82 is at low pressure.

[0026] Before detection, first measure the pressure parameter change value in the annular groove 10 when the gate plate 6 withdraws from the valve seat 4, and measure the pressure parameter change value in the sealed space when the gate plate 6 is completely fitted into the valve seat 4.

[0027] After the gate 6 is fully fitted into the valve seat 4, that is, after the gate sealing surface 7 and the first sealing surface 81 and the second sealing surface 82 are in full contact to form a sealed space, the pressure in this sealed space is conducted through the first pressure guiding hole 11, the pressure guiding pipe 15 and the second pressure guiding pipe 15 to the pressure sensor 16. After that, the pressure sensor 16 conducts the measured pressure parameter to the intelligent detection system through the wire 17. The intelligent detection system analyzes this pressure parameter to determine whether there is damage to the first sealing surface 81 and the second sealing surface 82.

[0028] When there is damage at the high-pressure side, that is, at the first ring projection 8, the pressure conducted by the first pressure guiding hole 11, the pressure guiding pipe 15 and the second pressure guiding pipe 15 to the pressure sensor 16 will increase; when there is damage at the low-pressure side, that is, at the second ring projection 9, the pressure conducted by the first pressure guiding hole 11, the pressure guiding pipe 15 and the second pressure guiding pipe 15 to the pressure sensor 16 will decrease.

[0029] The above-mentioned pressure change values are always recorded in the intelligent detection system. The staff can comprehensively analyze the real-time pressure curve during the process of the gate 6 withdrawing from and entering the valve seat 4 through the intelligent detection system, and conduct an intelligent evaluation of the damage situation through the neuron algorithm. Using the method of big data modal analysis, comprehensively judge the effectiveness of the first sealing surface 81 and the second sealing surface 82, effectively monitor whether there is internal leakage in the valve, make up for the defect in the prior art that strain gauges are pasted on the valve stem 5 to collect valve working data and cannot judge whether there is internal leakage in the valve, and the structure of this application is simple and does not affect the normal operation of the valve, with practicability.

[0030] In one or more embodiments, the pressure guiding pipe 15 is a stainless steel pipe. The pressure guiding pipe 15 is selected as a 1Cr18Ni9Ti acid-resistant stainless steel pipe to improve the service life of the pressure guiding pipe 15. At the same time, the stainless steel material has a certain strength to ensure the use strength of the pressure guiding pipe 15.

[0031] In one or more embodiments, the pressure guiding pipe 15 is a corrugated pipe. When the floating valve seat 4 is applicable in this application, a corrugated pipe can be selected as the pressure guiding pipe 15 to avoid the pressure guiding pipe 15 from interfering with the movement of the valve seat 4 and improve the applicability of this application.

[0032] Embodiment 2:

[0033] See Figure 6 , as the second embodiment of the present invention, the same or corresponding components as those in the first embodiment adopt the corresponding reference numerals in the first embodiment. Only the differences between the second embodiment and the first embodiment will be described below.

[0034] The difference between the second embodiment and the first embodiment lies only in that: the pressure guiding mechanism is a through hole 18 formed in the valve body 1, one end of the through hole 18 communicates with the annular groove 10, and the other end penetrates through the outer surface of the valve body 1. That is, in the second embodiment, there is only one through hole 18, and the through hole 18 is equivalent to the sum of the first pressure guiding hole 11, the pressure guiding pipe 15, and the second pressure guiding hole 12 in the first embodiment. One end of the through hole 18 penetrates through the annular groove 10 to communicate with the above-mentioned sealed space, and the other end penetrates through the outer surface of the valve body 1. The externally arranged pressure sensor 16 is communicated with the through hole 18.

[0035] During operation, the pressure parameter value in the sealed space is conducted to the pressure sensor 16 through the through hole 18, and the pressure sensor 16 transmits the measured parameter back to the intelligent detection system through the wire 17. By comprehensively analyzing the pressure parameter data, the staff can know the effectiveness of the first sealing surface 81 or the second sealing surface 82.

[0036] Compared with the first embodiment, the second embodiment further reduces the components for transmitting the internal pressure parameters of the sealed space, effectively improves the accuracy of the pressure parameters measured by the pressure sensor 16 in the sealed space. At the same time, by reducing the use of the first pressure guiding hole 11, the first connecting member 13, the pressure guiding pipe 15, the second connecting member 14, and the second pressure guiding hole 12, it effectively reduces the possibility that the change value of the pressure parameters in the sealed space cannot be detected due to the damage of the above-mentioned components, and then reduces the number of times of valve disassembly inspection, which has practicability.

[0037] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A valve capable of online diagnosing leakage, comprising a valve body, a gate plate and a valve seat. The valve body includes the valve seat, and the gate plate is detachably mounted on the valve seat. It is characterized in that, The valve seat has a first annular projection and a second annular projection on the surface facing the gate plate. The second annular projection is located inside the first annular projection. There is an annular groove between the first annular projection and the second annular projection. The surface of the first annular projection facing the gate plate has a first sealing surface, and the surface of the second annular projection facing the gate plate has a second sealing surface. After the gate plate completely coincides with the valve seat, a sealed space is formed between the gate plate and the first sealing surface and the second sealing surface. A pressure guiding mechanism and a detection device are provided on the valve body. The detection device is located outside the valve body and is connected to the pressure guiding mechanism. The pressure guiding mechanism is used to continuously export the pressure in the sealed space to the outside of the valve body so that the detection device can detect this pressure; The pressure guiding mechanism is a first pressure guiding hole and a second pressure guiding hole opened on the valve body. The first end of the first pressure guiding hole communicates with the sealed space, and its second end penetrates through the valve body and is located inside the valve body. The second pressure guiding hole horizontally penetrates the valve body. The second pressure guiding hole has an inner end and an outer end. The second end of the first pressure guiding hole and the inner end of the second pressure guiding hole are connected by a pressure guiding pipe; The detection device includes a pressure sensor and a wire connected thereto; When the gate plate is completely fitted inside the valve seat, at this time, one side of the first sealing surface is at high pressure and the other side of the second sealing surface is at low pressure; when there is damage at the high-pressure side, that is, at the first annular projection, the pressure conducted to the pressure sensor through the first pressure guiding hole, the pressure guiding pipe, and the second pressure guiding pipe will increase; when there is damage at the low-pressure side, that is, at the second annular projection, the pressure conducted to the pressure sensor through the first pressure guiding hole, the pressure guiding pipe, and the second pressure guiding pipe will decrease; by detecting the pressure changes on the high-pressure side and the low-pressure side, the effectiveness of the first sealing surface and the second sealing surface is judged.

2. The valve capable of online leakage diagnosis according to claim 1, characterized in that: A first connector is installed at the second end of the first pressure guiding hole, and a second connector is installed at the inner end of the second pressure guiding hole. The two ends of the pressure guiding pipe are respectively connected to the first connector and the second connector.

3. The valve capable of online diagnosing leakage according to claim 2, wherein: The pressure guiding pipe is a stainless steel pipe.

4. The valve capable of online leakage diagnosis according to claim 2, wherein: The pressure guiding pipe is a corrugated pipe.

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