CN210799353U - Mechanical seal leakage detection system - Google Patents
Mechanical seal leakage detection system Download PDFInfo
- Publication number
- CN210799353U CN210799353U CN201921807095.2U CN201921807095U CN210799353U CN 210799353 U CN210799353 U CN 210799353U CN 201921807095 U CN201921807095 U CN 201921807095U CN 210799353 U CN210799353 U CN 210799353U
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- China
- Prior art keywords
- mechanical seal
- liquid level
- detection system
- fluid reservoir
- fixed intercommunication
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- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 22
- 238000012423 maintenance Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The utility model relates to a mechanical seal detects technical field, and discloses a mechanical seal leakage detection system, including the sealed letter body, the fixed intercommunication in bottom of the sealed letter body has the drainage tube, the fixed intercommunication of right-hand member of drainage tube has an album fluid reservoir, two proximity switches are installed in the front of collection fluid reservoir, the fixed intercommunication in top of collection fluid reservoir has the breather valve, the fixed intercommunication in below on collection fluid reservoir right side has the bleeder. According to the mechanical seal leakage detection system, two proximity switches are arranged on the outer wall of the liquid collection tank at different heights, namely a high liquid level alarm point and a high liquid level alarm point, when the liquid level in the liquid collection tank reaches a set high liquid level, the system can send a high liquid level alarm signal to a central controller to remind that the mechanical seal is checked; when the liquid level in the liquid collecting tank reaches the set high liquid level, the system sends a high liquid level alarm signal to the central controller to remind that the double-screw pump needs to be shut down immediately.
Description
Technical Field
The utility model relates to a mechanical seal detects technical field, specifically is a mechanical seal leakage detection system.
Background
The twin-screw pump is widely applied to the industries of petroleum, chemical engineering, storage and transportation and the like, and is used for loading, unloading and conveying crude oil, finished oil, liquid chemicals and the like; the pump is generally a double-suction double-screw pump with an external bearing, and four sets of mechanical seals are arranged on the pump and used for isolating a pump cavity from the external environment and preventing pumping media from leaking out of the pump cavity; the mechanical seal is a dynamic seal, the main seal of the mechanical seal is a static ring which is arranged on a bearing seat of the pump and is stationary and a dynamic ring which is arranged on the transmission shaft and rotates along with the transmission shaft, and the static ring and the dynamic ring are tightly jointed by spring force to achieve the purpose of preventing the medium in the pump cavity from leaking; in order to ensure that the mechanical seal can operate reliably for a long time, certain pumping media are needed between the movable ring and the static ring (sealing surface) to form a stable liquid film so as to prevent the leakage of the media in the pump cavity, and meanwhile, the sealing surface is lubricated and cooled; during normal operation, a small amount of pumping medium leaks between the moving ring and the static ring of the mechanical seal, which is necessary for ensuring the sealing performance of the mechanical seal and prolonging the service life of the mechanical seal, and the leakage amount can be volatilized into the surrounding atmosphere due to the high temperature of the sealing surface.
However, during the operation of the screw pump, abnormal conditions such as evacuation, abnormal vibration, fluid erosion, suspended particles, dry friction and the like exist, which all cause the mechanical seal to be opened abnormally or the abrasion of the mechanical seal to be intensified, and cause the mechanical seal to leak abnormally; meanwhile, the mechanical seal is used as a vulnerable part, and leakage caused by performance reduction is inevitable at the later life stage of the mechanical seal; because the leakage state of the mechanical seal cannot be monitored in real time, the damage or failure sign of the mechanical seal cannot be found in time, and the prevention and maintenance cannot be realized, the mechanical seal can be known to be damaged only when a large amount of leakage occurs; the leaked pumping medium flows to the periphery of the pump unit, so that not only is the surrounding environment polluted, and the accident shutdown loss is caused, but also serious safety accidents such as fire, explosion, poisoning and the like can be caused.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a mechanical seal leakage detection system, which can collect the medium leaked from the mechanical seal to prevent the leaked medium from polluting the surrounding environment; the running state of the mechanical seal can be transmitted to the central control system in real time, the intact condition of the mechanical seal can be judged, and an alarm signal can be sent to the central control system in time when the mechanical seal is damaged, so that online monitoring and preventive maintenance are realized, and accidental shutdown is avoided.
The utility model discloses a realize that technical purpose adopts following technical scheme: the utility model provides a mechanical seal leakage detection system, includes the sealed letter body, the fixed intercommunication in bottom of the sealed letter body has the drainage tube, the fixed intercommunication of right-hand member of drainage tube has a fluid collection jar, two proximity switch are installed in the front of fluid collection jar, the fixed intercommunication in top of fluid collection jar has the breather valve, the fixed intercommunication in below on fluid collection jar right side has the discharge valve.
Further, a collection port A is formed in the upper portion of the left side of the liquid collection tank, and a discharge port B is formed in the lower portion of the right side of the liquid collection tank.
Furthermore, the sealing box body is a mechanical sealing installation base, a closed mechanical sealing leakage cavity is arranged at the end, close to the atmosphere, of the sealing box body, and the sealing leakage cavity can be integrated with the sealing box body or can be separated from the sealing box body.
Furthermore, the proximity switch adopts a capacitive automatic control element, detects the height of the liquid level in the liquid collection tank and is not in contact with the liquid.
Furthermore, the breather valve adopts an air filter, and is a channel for communicating the liquid collecting tank with the outside atmosphere.
Further, the proximity switch is in electrical signal connection with a DCS (distributed control system) of the central control room.
Furthermore, two proximity switches are on same vertical line, and its proximity switch of the top is high position, and its proximity switch of the below is high position.
The utility model discloses possess following beneficial effect: the mechanical seal leakage detection system is arranged on a common base of a screw pump unit, leakage liquid of a mechanical seal is introduced into a liquid collecting tank, the height of liquid level in the liquid collecting tank is monitored in real time through a proximity switch arranged on the outer wall of the liquid collecting tank, liquid level information in the liquid collecting tank is transmitted to a central control system in real time, two proximity switches are arranged on the outer wall of the liquid collecting tank at different heights and are respectively a high liquid level alarm point and a high liquid level alarm point, and when the liquid level in the liquid collecting tank reaches a set high liquid level, the system can send a high liquid level alarm signal to a central controller to remind that the mechanical seal is checked; when the liquid level in the liquid collecting tank reaches the set high liquid level, the system sends a high liquid level alarm signal to the central controller to remind that the double-screw pump needs to be shut down immediately.
The utility model has the characteristics of it is following:
1. the device consists of simple mechanical parts and proximity switches, and has the advantages of few system parts, simple structure, small volume, convenience in installation and high reliability.
2. Leakage liquid of the mechanical seal is collected in the liquid collection tank, the leakage liquid cannot pollute the surrounding environment, and potential hidden dangers of environmental pollution, fire, explosion, poisoning and the like caused by the fact that the pumping medium leaks to the surrounding environment are eliminated.
3. The alarm points and the alarm value can be set according to the characteristics of the pumping medium, so that the prevention and maintenance can be conveniently realized, and the leakage of dangerous media is avoided.
4. The alarm signal is a switch signal, so that the anti-interference performance is good and the reliability is high.
5. The installation requirements of pumps of different series and different specifications can be met only by replacing the drainage tube, and the device has good universality.
Drawings
FIG. 1 is a schematic view of a mechanical seal leak detection system;
FIG. 2 is a schematic view of a mechanical seal leak detection tank configuration;
FIG. 3 is a schematic view of a proximity switch mounting location;
FIG. 4 is a schematic diagram of the proximity switch and the central control room control system.
In the figure: 1-a sealing box body, 2-a liquid collecting tank, 3-a proximity switch, 4-a drainage tube, 5-a breather valve and 6-a discharge valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, a mechanical seal leakage detection system includes a sealing box 1, wherein the sealing box 1 is a mechanical seal mounting base, and a closed mechanical seal leakage cavity is disposed at an end close to the atmosphere, the sealing leakage cavity may be integrated with the sealing box 1 or separated from the sealing box 1, wherein a drainage tube 4 is fixedly communicated with the bottom of the sealing box 1, the drainage tube 4 is a channel communicating the mechanical seal leakage cavity with a liquid collection tank 2, and the drainage tube 4 may be a seamless steel tube or a metal hose; the screw thread interfaces at the two ends of the drainage tube can be external threads or internal threads, or can be the combination of internal threads and external threads, wherein the right end of the drainage tube 4 is fixedly communicated with the liquid collecting tank 2, and the liquid collecting tank 2 can be a cylinder body or a cuboid in structure; can be provided with a heat preservation jacket or not; the forming process can be casting or welding, and the liquid collecting tank 2 can collect the medium leaked from the mechanical seal part to prevent the leaked medium from polluting the surrounding environment; wherein the left upper part of the liquid collecting tank 2 is provided with a collecting port A, the right lower part thereof is provided with a discharge port B, the front surface of the liquid collecting tank 2 is provided with two proximity switches 3, wherein the proximity switches 3 are in electric signal connection with a DCS (distributed control system) of a central control room, the running state of a mechanical seal can be transmitted to the central control system in real time, the sound condition of the mechanical seal can be judged, when the mechanical seal is damaged, an alarm signal can be sent to the central control system in time, so that online monitoring and preventive maintenance are realized, and accidental shutdown is avoided, the two proximity switches 3 are on the same vertical line, the uppermost proximity switch 3 is in a high position, the lowermost proximity switch 3 is in a high position, the proximity switches 3 adopt a capacitive automatic control element, detect the liquid level height in the liquid collecting tank 2 and are not contacted with liquid, the top of the liquid collecting tank 2 is fixedly communicated with a breather, the breather valve 5 adopts an air filter, is a channel for communicating the liquid collecting tank 2 with the external atmosphere, prevents the medium in the mechanical seal leakage cavity from being discharged into the liquid collecting tank 2 smoothly due to pressure build-up, and the discharge valve 6 is fixedly communicated below the right side of the liquid collecting tank 2, so that the medium in the liquid collecting tank 2 can be discharged into a special container through the discharge valve 6.
When the mechanical seal is damaged, pumping medium flows into a mechanical seal leakage collection cavity in the seal box body 1 from a pump cavity, and leakage liquid flows into the liquid collection tank 2 through the drainage tube 4 under the action of gravity; along with the increase of leakage, the liquid level in the liquid collecting tank 2 will rise slowly, when the liquid level approaches the set high liquid level, the dielectric constant of the capacitor in the proximity switch 3 will be changed, so that the capacitance will change, and the state of the circuit connected with the measuring head will change, therefore, the connection or disconnection of the proximity switch 3 can be controlled, and the signal that the liquid level in the liquid collecting tank 2 approaches the set high liquid level is sent to the central control; when the liquid level rises to a set high liquid level value, the other approach switch 3 is triggered to send a signal that the liquid level in the liquid collection tank 2 is close to the set high liquid level value to the central control, so that the purpose of monitoring the damage condition of the mechanical seal in real time is realized, and the preventive maintenance is realized by arranging personnel for maintenance according to an alarm message; or stopping the machine for emergency repair, and preventing accidents caused by leakage of a large amount of media. And the equipment maintenance personnel can discharge the medium in the liquid collecting tank 2 to a special container through the discharge valve 6; the breather valve 5 arranged on the liquid collecting tank 2 communicates the inner cavity of the liquid collecting tank 2 with the atmosphere, so that the situation that the medium in the mechanical seal leakage cavity cannot be smoothly discharged into the liquid collecting tank 2 due to pressure build-up is prevented.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A mechanical seal leak detection system comprising a seal box (1), characterized in that: the fixed intercommunication in bottom of sealed letter body (1) has drainage tube (4), the fixed intercommunication of right-hand member of drainage tube (4) has collection fluid reservoir (2), two proximity switch (3) are installed in the front of collection fluid reservoir (2), the fixed intercommunication in top of collection fluid reservoir (2) has breather valve (5), the fixed intercommunication in below on collection fluid reservoir (2) right side has discharge valve (6).
2. The mechanical seal leak detection system of claim 1, wherein: the upper part of the left side of the liquid collecting tank (2) is provided with a collecting port, and the lower part of the right side of the liquid collecting tank is provided with a discharge port.
3. The mechanical seal leak detection system of claim 1, wherein: the sealing box body (1) is a mechanical sealing mounting base, and a closed mechanical sealing leakage cavity is arranged at the end, close to the atmosphere, of the sealing box body.
4. The mechanical seal leak detection system of claim 1, wherein: the proximity switch (3) adopts a capacitive automatic control element.
5. The mechanical seal leak detection system of claim 1, wherein: the breather valve (5) adopts an air filter.
6. The mechanical seal leak detection system of claim 1, wherein: the proximity switch (3) is in electrical signal connection with a DCS (distributed control system) of the central control room.
7. The mechanical seal leak detection system of claim 1, wherein: the two proximity switches (3) are on the same vertical line, the proximity switch (3) at the top is in a high position, and the proximity switch (3) at the bottom is in a high position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921807095.2U CN210799353U (en) | 2019-10-25 | 2019-10-25 | Mechanical seal leakage detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921807095.2U CN210799353U (en) | 2019-10-25 | 2019-10-25 | Mechanical seal leakage detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210799353U true CN210799353U (en) | 2020-06-19 |
Family
ID=71230267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921807095.2U Expired - Fee Related CN210799353U (en) | 2019-10-25 | 2019-10-25 | Mechanical seal leakage detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210799353U (en) |
-
2019
- 2019-10-25 CN CN201921807095.2U patent/CN210799353U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200619 |