CN216343006U - Internally cooled stationary seal assembly resistant to high temperatures and pressures - Google Patents
Internally cooled stationary seal assembly resistant to high temperatures and pressures Download PDFInfo
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- CN216343006U CN216343006U CN202122278250.XU CN202122278250U CN216343006U CN 216343006 U CN216343006 U CN 216343006U CN 202122278250 U CN202122278250 U CN 202122278250U CN 216343006 U CN216343006 U CN 216343006U
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- outer cover
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- 238000007789 sealing Methods 0.000 claims abstract description 47
- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 230000003068 static effect Effects 0.000 claims abstract description 15
- 238000004321 preservation Methods 0.000 claims description 6
- 238000012946 outsourcing Methods 0.000 claims 1
- 239000007789 gas Substances 0.000 description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 10
- 238000007906 compression Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 7
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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Abstract
The utility model provides an internal cooling static sealing device resistant to high temperature and high pressure, which comprises an impeller mechanical mechanism, a motor and an outer cover, wherein a main shaft of the impeller mechanical mechanism is connected with a motor shaft of the motor, the outer cover at least seals the motor and the motor shaft, an inlet pipe is arranged on the outer cover, low-temperature liquid enters the outer cover through the inlet pipe to cool the motor, and the heat absorbed by the motor is changed into high-temperature steam which enters the impeller mechanical mechanism to participate in circulation, so that the dynamic sealing of a bearing of the impeller mechanical mechanism is changed into static sealing. The utility model changes the dynamic seal of the bearing of the impeller mechanical mechanism into static seal.
Description
Technical Field
The utility model relates to the technical field of power devices, in particular to an internal cooling static sealing device resistant to high temperature and high pressure.
Background
The power device is a device for converting mechanical energy into electric energy or converting electric energy into mechanical energy; the centrifugal compressor comprises a motor and a compressor impeller, wherein when the motor rotates, the impeller is higher than the motor and rotates, external air enters the impeller in the shell from a gas inlet in the front of the shell along the axial direction, the air is accelerated and decelerated by the impeller rotating at high speed and changed into radial motion, so that kinetic energy is converted into potential energy (pressure), and finally, the potential energy (pressure) leaves the compressor from a gas outlet pipe of the shell along the radial direction of the impeller and is used by a user;
the centrifugal compressor in the prior art has the following problems that a sealing device called a shaft seal is arranged between a part of an output shaft of a motor, which penetrates through a shell of the motor, and the shell, but the sealing device is not possible to completely prevent gas leakage in occasions with high temperature, high pressure and large capacity, if compressed gas is inflammable, explosive, toxic and harmful gas, once leakage occurs, environmental pollution can be caused, the physical health of an operator is seriously damaged, and the problem needs to be solved, and a power device can be well developed and applied.
SUMMERY OF THE UTILITY MODEL
The utility model provides an internal cooling static sealing device resistant to high temperature and high pressure, which aims at one or more problems in the prior art and comprises an impeller mechanical mechanism, a motor and an outer cover, wherein a main shaft of the impeller mechanical mechanism is connected with a motor shaft of the motor, the outer cover at least seals the motor and the motor shaft, an inlet pipe is arranged on the outer cover, low-temperature liquid enters the outer cover through the inlet pipe to cool the motor, and the low-temperature liquid absorbs heat of the motor to become high-temperature steam which enters the impeller mechanical mechanism to participate in circulation, so that the dynamic sealing of a bearing of the impeller mechanical mechanism is changed into static sealing.
Optionally, the impeller mechanical mechanism comprises an impeller cabin and an impeller located in the impeller cabin, the impeller is fixed on the main shaft, part of the main shaft is located in the outer cover, low-temperature high-pressure liquid enters the outer cover through the inlet pipe, and enters the motor for cooling after being pressurized by the fan in the motor shaft, the heat of the motor is absorbed to become high-temperature high-pressure steam, and the high-temperature high-pressure steam pressure inside the outer cover is greater than the internal pressure of the impeller mechanical mechanism and enters the impeller mechanical mechanism through a bearing gap on the main shaft, so that the high-temperature high-pressure resistant internal cooling static sealing of the bearing of the impeller mechanical mechanism is realized.
Optionally, the device further comprises a shutdown seal, wherein the shutdown seal is used for communicating the main shaft and the motor shaft, so that high-temperature and high-pressure steam flows from the motor to the impeller in a single direction, the gas flow of the impeller cabin in the opposite direction to the motor when the impeller mechanical device stops running is blocked, and the motor is prevented from being heated.
Optionally, a temperature sensor is further included for detecting a stator coil temperature of the motor.
Optionally, the device further comprises a controller, wherein the controller controls the flow rate of the low-temperature high-pressure liquid in the inlet pipe according to the temperature of the stator coil detected by the temperature sensor, and the flow rate of the low-temperature high-pressure liquid is larger as the temperature of the stator coil is higher.
Optionally, a cooling line is further included and is disposed between the shutdown seal and the rear wall of the impeller compartment.
Optionally, the cooling system further comprises a first heat preservation layer, and the first heat preservation layer surrounds the cooling pipeline.
Optionally, a second layer of insulation is included, the second layer of insulation being disposed between the outer shroud and the rear wall of the impeller pod.
Optionally, the inlet pipe is arranged at a position corresponding to the motor shaft on the non-power side of the motor of the housing.
Optionally, the impeller mechanism and its main shaft are enclosed within a housing.
The sealing device of the utility model changes the dynamic seal of the shaft into the externally made static seal, and has the advantages and beneficial effects that:
the leakage of internal and external gases is eliminated, the trouble of supplementing sealing oil and gas is reduced, the configuration of related equipment is reduced, and the system cost is reduced, for example, the working pressure of a carbon dioxide compressor is far greater than the atmospheric pressure, dry gas sealing is adopted, and the carbon ring sealing leakage is inevitable, so a closed circulation system has to prepare a regular automatic steam supplementing system, the system is complex, the cost is high, the reliability is reduced, and the problems can be thoroughly solved by adopting the scheme of the utility model;
energy is recycled, heat generated by the motor is totally recycled into the impeller mechanical mechanism, the efficiency of the impeller mechanical mechanism is improved, the temperature of the motor is reduced, the service life of the motor is prolonged, and the energy consumption of the motor is reduced;
the present invention can be used with systems ranging from as little as a few kilowatts to as much as hundreds of thousands of kilowatts.
Drawings
FIG. 1 is a schematic view of an embodiment of an internally cooled stationary seal assembly of the present invention that is resistant to high temperatures and pressures;
FIG. 2 is a schematic view of another embodiment of the internally cooled stationary seal assembly of the present invention that is resistant to high temperatures and pressures;
icon: 1-main shaft, 2-impeller mechanical mechanism, 3-back wall, 4-second heat insulation layer, 5-cooling pipeline, 6-stop seal, 7-bearing seat, 8-coupling, 9-motor, 10-outer cover, 11-inlet pipe, 12-first heat insulation layer, 13-compression inlet pipe, 14-compression outlet pipe and 15-impeller cabin.
Detailed Description
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 and 2, the internal cooling static sealing device resistant to high temperature and high pressure comprises an impeller mechanical mechanism 2, a motor 9 and a closed outer cover 10, wherein a spindle 1 of the impeller mechanical mechanism is connected with a motor shaft of the motor, the outer cover at least seals the motor and the motor shaft, an inlet pipe is arranged on the outer cover, low-temperature liquid enters the outer cover through the inlet pipe to cool the motor, and the absorbed heat of the motor is changed into high-temperature steam which enters the impeller mechanical mechanism to participate in circulation, so that the dynamic sealing of a bearing of the impeller mechanical mechanism is changed into static sealing.
In one embodiment, as shown in fig. 1, the impeller mechanical mechanism includes an impeller chamber 15 and an impeller located in the impeller chamber, the impeller is fixed on a main shaft, part of the main shaft is located in an outer cover, low-temperature high-pressure liquid enters the outer cover through an inlet pipe, and enters the motor after being pressurized by a fan (not shown) in a motor shaft to be cooled, the heat absorbed by the motor is changed into high-temperature high-pressure steam, and the high-temperature high-pressure steam enters the interior of the impeller mechanical mechanism through a bearing gap on the main shaft because the high-temperature high-pressure steam pressure inside the outer cover is greater than the internal pressure of the impeller mechanical mechanism, so that the high-temperature high-pressure resistant internal cooling static sealing of the bearing of the impeller mechanical mechanism is realized, and if no such measures are taken, the gas inside the impeller mechanical mechanism can be greatly leaked from the interior to the exterior.
In one embodiment, as shown in fig. 1, the sealing device further comprises a shutdown seal 6, which is used for communicating the spindle and the motor shaft, so that high-temperature and high-pressure steam flows from the motor to the impeller in a single direction, and the gas flow of the impeller cabin in the opposite direction of the motor when the impeller mechanical device stops running is blocked, and the motor is prevented from being heated.
In one embodiment, the sealing device further comprises a temperature sensor (not shown) for detecting the stator coil temperature of the motor.
Preferably, the sealing device further includes a controller (not shown) that controls the flow rate of the low-temperature high-pressure liquid of the inlet pipe by the temperature of the stator coil detected by the temperature sensor, the higher the temperature of the stator coil is, the larger the flow rate of the low-temperature high-pressure liquid is.
In one embodiment, as shown in fig. 1, the sealing device further comprises a cooling line 5 arranged between the shutdown seal and the rear wall 3 of the nacelle.
Preferably, the device further comprises a first heat preservation layer 12, and the first heat preservation layer surrounds the cooling pipeline.
In one embodiment, as shown in fig. 1, the sealing device further comprises a second insulation layer 4, which is arranged between the outer cover 10 and the rear wall 3 of the wheel well.
In one embodiment, as shown in fig. 1, the inlet pipe on the outer cover is arranged at a position corresponding to a motor shaft on the non-power side of the motor of the outer cover, so that low-temperature high-pressure liquid which is the same as the working medium of the impeller mechanical mechanism enters the motor to cool the motor, absorbs the heat of the motor to become high-temperature high-pressure steam, and flows to the impeller mechanical mechanism in a unidirectional mode from the motor side through the bearing gap.
In one embodiment, the sealing device is a semi-closed externally-closed internally-cooled turbine, as shown in fig. 1, the sealing device comprises an inlet pipe 11 (low-temperature liquid inlet pipe or/and low-temperature air inlet pipe), a motor 9, an impeller cabin 15, an impeller, a main shaft 1, a bearing seat 7, a shutdown seal 6 and a coupling 8, a motor shaft of the motor 9 is connected with the main shaft 1 of the impeller 2 by the coupling 8 and all fixed on the same rigid base (a chassis for fixing the impeller power machine, the bearing seat and the motor), the motor 9 is connected with the rear wall 3 of the impeller cabin by a completely-closed outer cover 10, the motor 9 and the bearing seat 7 are completely sealed in the outer cover 10 so as to enable the dynamic seal to be completely converted into the static seal, the inlet pipe 11 is arranged at a position corresponding to a shaft on the non-power side of the outer cover 10, the inlet pipe corresponds to a position along the opposite direction of the motor shaft, and a shaft fan is arranged inside a common motor and sealed in the outer cover, and the low-temperature high-pressure liquid which is close to 0 ℃ and is completely the same as the working medium of the mechanical mechanism of the impeller enters the closed outer cover from the outer cover 10 through the inlet pipe 11 and is blown to the inside of the motor 9 to cool the motor 9 after being absorbed by the fan of the motor shaft, because the pressure of the low-temperature high-pressure liquid added from the outside is greater than the pressure of a power device, the motor shaft of the motor 9 is communicated with the main shaft 1 of the impeller 2 through the stop seal 6, gas can only flow from the motor 9 to the impeller 2 in a single direction, and the flow of the low-temperature gas is controlled by detecting the temperature of the stator coil, thereby ensuring that the stator coil of the motor 9 works within a specified temperature range.
Preferably, the main shaft 1, the bearing housing 7 and the coupling 8 are made of stainless steel to reduce heat conduction; a heat insulating material (a second heat insulating layer 4) is arranged between the outer cover 10 and the rear wall 3, the rear wall 3 of the whole impeller cabin is wrapped by the heat insulating material, a section of cooling pipeline 5 with the heat insulating and stopping heat insulating functions is arranged outside the shaft between the bearing seat 7 and the impeller 2, the length of the cooling pipeline is determined according to the working temperature (the length of the cooling pipeline is higher when the working temperature is higher), when the working temperature of the whole machine is lower than 150 ℃, the cooling pipeline 5 can be omitted, the cooling pipeline 5 is close to one side of the bearing seat 7, and a stopping sealing device 6 is arranged, when the impeller stops moving, the stopping sealing device 6 blocks the gas flow of the impeller 2 to the side of the motor 9, and prevents the high-temperature gas at the impeller 2 side from flowing to the side of the motor 9 to heat the motor 9 so as to damage the motor 9; the bearing in the bearing seat 7 is a high-temperature-resistant bearing and lubricated by grease; the power lines of the motor and the monitoring system lines are connected by a glass-fused sealed bushing (aircraft connector) mounted on the housing 10.
In one embodiment, the sealing device is a carbon dioxide compressor, the inlet pressure is 3 mpa, the temperature is 390 ℃, the exhaust pressure is 3.2 mpa, the temperature is 400 ℃, the flow rate is 60Kg/s, the motor power is 630kw, the motor efficiency is 0.87, the motor loss is converted into heat energy with the value of 630 × (1-0.87) ═ 82kj, carbon dioxide liquid with the pressure of 3.3 mpa and the temperature of-3 ℃ is input into the closed housing 10 through the inlet pipe 11, the carbon dioxide liquid is evaporated into gas immediately after entering the housing 10, but the pressure is not changed, the latent heat of evaporation is 245kgj/Kg, the flow rate of the carbon dioxide liquid required for the motor loss in the embodiment is 82 ÷ 245 ÷ 0.34Kg, the ratio of the flow rate to the total flow rate of the sealing device is 0.34 ÷ 60 ═ 0.0057, and the heat lost by the motor is totally recovered.
In one embodiment, as shown in fig. 2, the impeller mechanism and its main shaft are enclosed in a housing, that is, the motor 9, the motor shaft, the impeller mechanism 2, and the main shaft 1 of the impeller mechanism are all sealed in the housing 10, and low-temperature high-pressure liquid enters the housing through an inlet pipe, absorbs heat of the motor and turns into high-temperature high-pressure steam, and since the high-temperature high-pressure steam pressure inside the housing is greater than that inside the impeller mechanism, the high-temperature high-pressure steam can only flow unidirectionally from the motor side to the impeller mechanism side through the bearing gap, thereby achieving internal cooling of the motor.
In one embodiment, the sealing device is a fully sealed internal cooling turbine suitable for small power mechanical mechanisms.
In one embodiment, as shown in fig. 2, the sealing device is a fully sealed internal cooling gas compressor, which includes a compressor body, a main shaft, an outer cover, a motor shaft, an inlet pipe, a compression inlet pipe and a compression outlet pipe, wherein gas enters from the compression inlet pipe 13, is compressed and then is discharged from the compression outlet pipe, the low-temperature high-pressure at the rear side of the motor 9 is provided with an inlet pipe 11 for inputting low-temperature liquid, the low-temperature liquid absorbs the heat of the motor after entering the sealed outer cover and is immediately evaporated to form low-temperature high-pressure steam, because the pressure of the low-temperature high-pressure steam is greater than the pressure at the inlet end of the main shaft of the compressor body, so that the gas flows to the inlet end of the main shaft of the compressor body in a single direction, the motor is cooled, the temperature of the stator coil is detected to control the flow rate of the low-temperature gas, the basic compression function of the compressor body is not influenced due to the fact that the liquid flow is limited and the noise is not generated.
In one embodiment, the sealing device is a totally-enclosed internal cooling trifluoromethane high-temperature compressor, the specific structure is shown in fig. 2, due to process requirements, trifluoromethane r23 gas with the temperature of 190 ℃ and the pressure of 1 MPa is required to be increased to 200 ℃ and the pressure of 1.2 MPa, and because a motor cannot bear the high temperature, a common totally-enclosed refrigeration compressor cannot meet the requirements, the totally-enclosed internal cooling compressor disclosed by the utility model is adopted; the compressor body can adopt any compressor (for example, a scroll compressor or a vortex compressor), gas enters from a compression gas inlet pipe 13 and is discharged from a compression gas outlet pipe 14 after being compressed, an inlet pipe 11 is arranged at the low temperature and high pressure at the rear side of the motor 9, liquid trifluoromethane with the pressure of 24 ℃ below zero and 1.3 MPa is input, the liquid trifluoromethane absorbs the heat of the motor after entering a sealed outer cover and is evaporated immediately to form low-temperature high-pressure steam, the pressure of the liquid trifluoromethane is greater than the pressure at the inlet end of a main shaft of the compressor body, so that the gas flows to the compressor body in a one-way mode, when the liquid is evaporated to be gas, the heat generated by a stator or a rotor of the motor can be cooled and taken away, and the motor is cooled.
The sealing device of the utility model simplifies the complex problem, converts the moving and rotating sealing into the static sealing, and can reduce the cost to a fraction of 1/10.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An internally cooled stationary seal assembly that is resistant to high temperatures and pressures, comprising: the impeller mechanical mechanism comprises an impeller mechanical mechanism, a motor and an outer cover, wherein a main shaft of the impeller mechanical mechanism is connected with a motor shaft of the motor, the outer cover at least seals the motor and the motor shaft, an inlet pipe is formed in the outer cover, low-temperature liquid enters the outer cover through the inlet pipe to cool the motor, and heat absorbed by the motor is changed into high-temperature steam to enter the impeller mechanical mechanism to participate in circulation, so that dynamic sealing of a bearing of the impeller mechanical mechanism is changed into static sealing.
2. The sealing device of claim 1, wherein: the impeller mechanical mechanism comprises an impeller cabin and an impeller located in the impeller cabin, the impeller is fixed on a main shaft, part of the main shaft is located in an outer cover, low-temperature high-pressure liquid enters the outer cover through an inlet pipe, and enters a motor after being pressurized by a fan in a motor shaft to be cooled, the heat of the motor is absorbed to be changed into high-temperature high-pressure steam, the high-temperature high-pressure steam pressure in the outer cover is larger than the internal pressure of the impeller mechanical mechanism, and the high-temperature high-pressure steam enters the impeller mechanical mechanism through a bearing gap on the main shaft, so that the high-temperature high-pressure resistant internal cooling static sealing of a bearing of the impeller mechanical mechanism is realized.
3. The sealing device of claim 2, wherein: the high-temperature high-pressure steam flows from the motor to the impeller in a single direction, and the gas flow of the impeller cabin in the direction opposite to the motor when the impeller mechanical device stops running is blocked, so that the motor is prevented from being heated.
4. The sealing device of claim 2, wherein: the temperature sensor is used for detecting the temperature of the stator coil of the motor.
5. The sealing device of claim 4, wherein: the device also comprises a controller, wherein the controller controls the flow rate of the low-temperature high-pressure liquid in the inlet pipe according to the temperature of the stator coil detected by the temperature sensor, and the higher the temperature of the stator coil is, the higher the flow rate of the low-temperature high-pressure liquid is.
6. The sealing device of claim 3, wherein: the cooling pipeline is arranged between the shutdown seal and the rear wall of the impeller cabin.
7. The sealing device of claim 6, wherein: still include first heat preservation, the cooling pipeline is enclosed to first heat preservation outsourcing.
8. The sealing device of claim 1, wherein: the impeller comprises an outer cover and an impeller cabin, and further comprises a second insulating layer, wherein the second insulating layer is arranged between the outer cover and the rear wall of the impeller cabin.
9. The sealing device of claim 1, wherein: the inlet pipe is arranged at the position, corresponding to the motor shaft, of the non-power side of the motor of the outer cover.
10. The sealing device of claim 1, wherein: the impeller mechanism is enclosed within a sealed enclosure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122278250.XU CN216343006U (en) | 2021-09-18 | 2021-09-18 | Internally cooled stationary seal assembly resistant to high temperatures and pressures |
| PCT/CN2022/076889 WO2023040184A1 (en) | 2021-09-18 | 2022-02-18 | High temperature and high pressure-resistant internal cooling static sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122278250.XU CN216343006U (en) | 2021-09-18 | 2021-09-18 | Internally cooled stationary seal assembly resistant to high temperatures and pressures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216343006U true CN216343006U (en) | 2022-04-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122278250.XU Active CN216343006U (en) | 2021-09-18 | 2021-09-18 | Internally cooled stationary seal assembly resistant to high temperatures and pressures |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216343006U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114251298A (en) * | 2021-09-18 | 2022-03-29 | 成都佳灵绿色能源有限责任公司 | Internally cooled stationary seal assembly resistant to high temperatures and pressures |
-
2021
- 2021-09-18 CN CN202122278250.XU patent/CN216343006U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114251298A (en) * | 2021-09-18 | 2022-03-29 | 成都佳灵绿色能源有限责任公司 | Internally cooled stationary seal assembly resistant to high temperatures and pressures |
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