CN219299597U - Recovery device for mechanical seal sealing water of condensate pump - Google Patents
Recovery device for mechanical seal sealing water of condensate pump Download PDFInfo
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- CN219299597U CN219299597U CN202320125935.7U CN202320125935U CN219299597U CN 219299597 U CN219299597 U CN 219299597U CN 202320125935 U CN202320125935 U CN 202320125935U CN 219299597 U CN219299597 U CN 219299597U
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Abstract
The utility model discloses a recovery device of sealing water of a condensate pump, which belongs to the technical field of condensate pump sealing, and comprises a condensate pump sealing and a water inlet pipe, wherein a water inlet port F, a flushing water port Q and a water outlet port F 'of the condensate pump sealing are connected with a water outlet of the water inlet pipe, and a port between the water outlet port F' and a condensate pump air pumping pipe is plugged; the pipeline from the bottom sealing part of the condensate pump to the condensate pump inlet is communicated with the condensate pump air exhaust pipe, and the pipeline from the bottom sealing part of the condensate pump to the condensate pump inlet is provided with a back pressure valve. The beneficial effects of the utility model are as follows: a path of sealing water source is added at the drainage interface F ', the interface between the drainage interface F ' and the condensing pump air exhaust pipe is plugged, and a back pressure valve is arranged on a pipeline from the bottom sealing part of the condensing pump machine to the inlet of the condensing pump, so that the drainage interface F ' can be effectively prevented from being directly connected to the condensing pump air exhaust pipe, a vacuum system is prevented from being directly connected with the atmosphere, and the continuous exhaust air enters to influence the dissolved oxygen of the condensed water and the vacuum of a condenser.
Description
Technical Field
The utility model relates to the technical field of condensate pump mechanical seal, in particular to a condensate pump mechanical seal sealing water recovery device.
Background
The mechanical sealing structure of the cylindrical bag type multistage centrifugal pump is shown in fig. 1, and comprises a shaft seal 100, a static ring 200 and a dynamic ring 300, wherein after the axial contact surfaces of the dynamic ring 300 and the static ring 200 are ground with high precision, the tight axial sealing is ensured under the action of a spring in a sealing part, the leakage amount of liquid is reduced to a small extent by the gap throttling action of a very small friction surface, and the pump conveying efficiency is ensured; the lubrication and cooling of the friction surface are completed by introducing a clean water source (condensed water or desalted water) into a water inlet interface F11 in the figure, the water inlet pressure is 0.2-0.6 Mpa, and the water quantity of external water supply is 0.8-1.2m 3 And/h, the temperature is less than 38 ℃, the water return pressure of the drainage interface F'12 is ensured to be in the range of 0.1-0.15 Mpa, and the connection pipe is generally directly connected to the degassing pipeline to be led to the pump inlet. When the water pressure of the water source is lower than 0.15Mpa or the water quantity is lower than 0.5m 3 And (3) checking immediately when the time is/h, and stopping the machine if the recovery cannot be performed for twelve hours; the flushing water port Q13 is required to be introduced into the water tank, the water quantity and the water pressure are required to ensure that liquid can flow out in a drop shape at the matching gap of the mechanical seal drainage port D14 or the sealing gland and the shaft sleeve, and the mechanical seal drainage port D14 is not connected with any part.
Taking a Kaiser ratio NLT350-400 multiplied by 6 type coagulation pump selected in Guangzhou Huarun electric field as an example, the NLT350-400 multiplied by 6 type coagulation pump is a cylindrical bag type multistage centrifugal pump designed for meeting 300-600MW unit, the shaft end is selected to be mechanically sealed according to manufacturer design, and the specific structure is shown in figure 2, the water inlet interface F11 and the water inlet of the flushing water interface Q13 are connected with the water outlet of the water inlet pipe 2, and the water inlet of the water inlet pipe 2 is respectively connected with the water outlets of the desalted water pipeline 5 and the condensed water pipeline 6; the drainage interface F'12 is directly communicated with the condensate pump air exhaust pipe 3, and a pipeline for draining water from the bottom sealing part of the condensate pump machine to the condensate pump inlet is indirectly connected with the condensate pump air exhaust pipe 3. The main problems in the practical use are that the water throwing amount at the shaft end mechanical seal is large, and the phenomenon of exceeding the standard of dissolved oxygen of the condensed water is accompanied. The reason for the analysis and investigation is as follows:
(1) The mechanical seal of the condensate pump is actually not contacted with the static ring due to the installation or operation abrasion, and the gap between the dynamic ring and the static ring is the only communication point between the interior and the exterior of the mechanical seal, which is increased to the extent that the sealing water is insufficient to completely isolate the mechanical seal from the atmosphere.
(2) The drainage interface F' is horizontally arranged and directly connected to the condensate pump air pumping pipe, and a pipeline from the bottom of the machine seal to the condensate pump inlet is also indirectly connected to the condensate pump air pumping pipe, so that the pressure difference between the inside and outside of the machine seal is further increased and is communicated with a condenser vacuum system, and when the machine seal ring and the static ring are not contacted with gaps, air is continuously inhaled to cause the oxygen dissolution of the condensate water to exceed the standard.
(3) According to the drawing provided by a condensate pump mechanical seal manufacturer and the disassembly confirmation of an old mechanical seal, two interfaces are respectively arranged at the middle part and the top part of the mechanical seal, and four sealing water interfaces are arranged at the total, wherein the water inlet F is sealing cooling water according to the design, the opening of a manual door is regulated to be not limited, and the water supply flow is ensured to be 0.8-1.2m 3 And (3) taking the other flushing water interface Q as flushing water, and adjusting the opening of the manual door to adjust the opening of the manual door until water drops flow out from the matching gap of the mechanical seal drainage interface or the sealing gland and the shaft sleeve, wherein the actual water inflow F and Q are in a full-open state, which is the main reason for causing a large amount of water throwing of the mechanical seal.
In view of this, the present inventors have made intensive studies to address this need, and have made the present utility model.
Disclosure of Invention
In order to overcome the problems that a condensate pump in the prior art has serious mechanical seal water throwing and is accompanied with the phenomenon of exceeding of dissolved oxygen of condensate water, the utility model provides a condensate pump mechanical seal water recovery device, which comprises a condensate pump mechanical seal and a water inlet pipe, wherein a water inlet port F and a water outlet port F ' are formed in the middle part of the condensate pump mechanical seal, a flushing water port Q is formed in the top part of the condensate pump mechanical seal, the water inlet port F, the flushing water port Q and the water outlet port F ' are connected with a water outlet of the water inlet pipe, and an interface between the water outlet port F ' and a condensate pump air suction pipe is plugged; and a pipeline from the bottom sealing part of the condensate pump to the condensate pump inlet is communicated with the condensate pump air pumping pipe, and a back pressure valve is arranged on the pipeline from the bottom sealing part of the condensate pump to the condensate pump inlet.
Considering that unavoidable abrasion of the sealing ring of the condensing pump and the static ring in operation, loss of elasticity of a spring and the like occur, a path of sealing water source is added at the drainage interface F ', an interface between the drainage interface F ' and the condensing pump air suction pipe is plugged, a back pressure valve is arranged on a pipeline from the bottom of the sealing ring of the condensing pump to the inlet of the condensing pump, the drainage interface F ' can be effectively prevented from being directly connected to the condensing pump air suction pipe, a vacuum system is prevented from being directly connected with the atmosphere, and continuous air suction enters to influence the dissolved oxygen of the condensed water and the vacuum of the condenser.
Preferably, an organic seal drainage interface D is further formed at the top of the condensate pump seal, and a water outlet of the organic seal drainage interface D is communicated with the multistage water seal pipe. In order to ensure the cooling seal under the condition that the mechanical seal ring of the coagulation pump is in good contact with the static ring, the mechanical seal water drainage interface D is used for recycling and guiding the water to the multistage water seal cylinder pipeline from the sealing water of the water feed pump.
Preferably, a pipeline from the bottom of the condensate pump to the condensate pump inlet is further provided with a back pressure valve bypass valve connected with the back pressure valve in parallel.
Preferably, a recycling manual door is arranged on a pipeline for recycling drain water at the bottom of the condensate pump machine seal to the condensate pump inlet. In order to ensure the reliable use and the stop and isolation of the condensed pump mechanical seal sealing water drainage recovery pipeline, a manual door is respectively arranged on each of the branches of the multi-stage water seal cylinder for condensed pump mechanical seal sealing water drainage recovery, and a check door and a return water bend are arranged to prevent siphoning and vacuumizing.
Preferably, the water inlet of the water inlet pipe is respectively connected with the water outlets of the desalting water pipeline and the condensing water pipeline; the demineralized water pipeline is provided with a demineralized water supplementing check valve and a demineralized water supplementing manual door, and the condensed water pipeline is provided with a condensed water supplementing check valve and a condensed water supplementing manual door.
Preferably, the drainage interface F' is connected with the water outlet of the water inlet pipe through a sealing water pipe, and a sealing water supplementing check valve and a sealing water supplementing manual door are arranged on the sealing water pipe.
Preferably, a condensed water compensating filter screen is arranged at one end of the condensed water pipeline, which is close to the water inlet of the water inlet pipe.
Preferably, the water inlet port F and the water inlet port of the flushing water port Q are respectively provided with a water inlet port manual door and a flushing water port manual door.
The beneficial effects are that:
the technical scheme of the utility model has the following beneficial effects:
(1) A path of sealing water source is added at the drainage interface F ', the interface between the drainage interface F ' and the condensing pump air exhaust pipe is plugged, and a back pressure valve is arranged on a pipeline from the bottom sealing part of the condensing pump machine to the inlet of the condensing pump, so that the drainage interface F ' can be effectively prevented from being directly connected to the condensing pump air exhaust pipe, a vacuum system is prevented from being directly connected with the atmosphere, and the continuous exhaust air enters to influence the dissolved oxygen of the condensed water and the vacuum of a condenser.
(2) In order to ensure the cooling seal under the condition that the mechanical seal ring of the coagulation pump is in good contact with the static ring, the mechanical seal water drainage interface D is used for recycling and guiding the water to the multistage water seal cylinder pipeline from the sealing water of the water feed pump.
(3) In order to ensure the reliable use and the stop and isolation of the condensed pump mechanical seal sealing water drainage recovery pipeline, a manual door is respectively arranged on each of the branches of the multi-stage water seal cylinder for condensed pump mechanical seal sealing water drainage recovery, and a check door and a return water bend are arranged to prevent siphoning and vacuumizing.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art mechanical seal of a condensate pump;
FIG. 2 is a block diagram of a sealing water pipeline of a condensate pump in the prior art;
FIG. 3 is a diagram of the seal water circuit of the condensate pump of the present utility model.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.
As shown in fig. 3, the recovery device for the sealing water of the condensate pump machine seal comprises a condensate pump machine seal 1 and a water inlet pipe 2, wherein a water inlet port F11 and a water outlet port F '12 are formed in the middle of the condensate pump machine seal 1, a flushing water port Q13 is formed at the top of the condensate pump machine seal 1, inlets of the water inlet port F11, the flushing water port Q13 and the water outlet port F '12 are connected with a water outlet of the water inlet pipe 2, and a port between the water outlet port F '12 and a condensate pump air outlet pipe 3 is plugged; the pipeline from the bottom of the condensate pump mechanical seal 1 to the condensate pump inlet is communicated with the condensate pump air pumping pipe 3, and the pipeline from the bottom of the condensate pump mechanical seal 1 to the condensate pump inlet is provided with a back pressure valve 41.
Considering that unavoidable abrasion of the sealing ring and the static ring of the condensate pump in operation, loss of elasticity of a spring and the like occur, a path of sealing water source is added at the drainage interface F ', an interface between the drainage interface F ' and the condensate pump air suction pipe is plugged, a back pressure valve is arranged on a pipeline from the bottom of the sealing ring of the condensate pump to the inlet of the condensate pump, the drainage interface F ' can be effectively prevented from being directly connected to the condensate pump air suction pipe, a vacuum system is prevented from being directly connected with the atmosphere, and continuous exhaust air enters to influence dissolved oxygen of the condensate water and vacuum of a condenser.
The top of the condensate pump mechanical seal 2 is also provided with an organic seal drainage interface D14, and the water outlet of the mechanical seal drainage interface D14 is communicated with the multi-stage water seal cylinder pipeline 4. In order to ensure the cooling seal under the condition that the mechanical seal ring of the coagulation pump is in good contact with the static ring, the mechanical seal water drainage interface D is used for recycling and guiding the water to the multistage water seal cylinder pipeline from the sealing water of the water feed pump.
And a back pressure valve bypass valve 42 connected with the back pressure valve 41 in parallel is also arranged on a pipeline from the bottom of the condensate pump mechanical seal 1 to the condensate pump inlet.
A recovery manual door 43 is arranged on a pipeline for recovering the drain water at the bottom of the condensate pump mechanical seal 1 to the condensate pump inlet. In order to ensure the reliable use and the stop and isolation of the condensed pump mechanical seal sealing water drainage recovery pipeline, a manual door is respectively arranged on each of the branches of the multi-stage water seal cylinder for condensed pump mechanical seal sealing water drainage recovery, and a check door and a return water bend are arranged to prevent siphoning and vacuumizing.
The water inlet of the water inlet pipe 2 is respectively connected with the water outlets of the desalted water pipeline 5 and the condensed water pipeline 6; the demineralized water pipeline 5 is provided with a demineralized water supplementing check valve 51 and a demineralized water supplementing manual valve 52, and the condensate water pipeline 6 is provided with a condensate water supplementing check valve 61 and a condensate water supplementing manual valve 62.
The drainage interface F'12 is connected with the water outlet of the water inlet pipe 2 through a sealing water pipe 7, and the sealing water pipe 7 is provided with a sealing water supplementing check valve 71 and a sealing water supplementing manual valve 72.
A condensed water compensating filter screen 63 is arranged on one end of the condensed water pipeline 6, which is close to the water inlet of the water inlet pipe 2.
The water inlet port F11 and the water inlet port of the flushing water port Q13 are respectively provided with a water inlet port manual door 21 and a flushing water port manual door 22.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, and various modifications and variations may be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. The recovery device of the condensate pump mechanical seal sealing water is characterized by comprising a condensate pump mechanical seal and a water inlet pipe, wherein a water inlet port F and a water outlet port F ' are formed in the middle of the condensate pump mechanical seal, a flushing water port Q is formed in the top of the condensate pump mechanical seal, an inlet of the water inlet port F, the flushing water port Q and the water outlet port F ' are connected with a water outlet of the water inlet pipe, and an interface between the water outlet port F ' and a condensate pump air pipe is plugged; and a pipeline from the bottom sealing part of the condensate pump to the condensate pump inlet is communicated with the condensate pump air pumping pipe, and a back pressure valve is arranged on the pipeline from the bottom sealing part of the condensate pump to the condensate pump inlet.
2. The recovery device of the sealing water of the condensate pump machine according to claim 1, wherein the sealing top of the condensate pump machine is further provided with an organic sealing drainage interface D, and a water outlet of the organic sealing drainage interface D is communicated with a multi-stage water sealing pipe.
3. The condensate pump mechanical seal sealing water recycling device according to claim 1, wherein a back pressure valve bypass valve connected in parallel with the back pressure valve is further arranged on a pipeline from the bottom of the condensate pump mechanical seal to the condensate pump inlet.
4. The recovery device for sealing water of a condensate pump according to claim 1, wherein a recovery manual door is arranged on a pipeline for recovering drain water at the bottom of the condensate pump to an inlet of the condensate pump.
5. The recovery device of the mechanical seal sealing water of the condensate pump according to claim 1, wherein the water inlet of the water inlet pipe is respectively connected with the water outlets of the desalting water pipeline and the condensate pipeline; the demineralized water pipeline is provided with a demineralized water supplementing check valve and a demineralized water supplementing manual door, and the condensed water pipeline is provided with a condensed water supplementing check valve and a condensed water supplementing manual door.
6. The device for recycling sealing water of a condensate pump according to claim 5, wherein the drainage port F' is connected with the water outlet of the water inlet pipe through a sealing water pipe, and the sealing water pipe is provided with a sealing water supplementing check valve and a sealing water supplementing manual valve.
7. The device for recycling sealing water of a condensate pump according to claim 5, wherein a condensate water compensation filter screen is arranged at one end of the condensate water pipeline, which is close to the water inlet of the water inlet pipe.
8. The device for recycling sealing water of a condensate pump according to claim 5, wherein a water inlet port manual door and a water inlet port manual door of a water inlet port are respectively arranged at the water inlet port of the water inlet port F and the water inlet port of the water flushing port Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320125935.7U CN219299597U (en) | 2023-01-17 | 2023-01-17 | Recovery device for mechanical seal sealing water of condensate pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320125935.7U CN219299597U (en) | 2023-01-17 | 2023-01-17 | Recovery device for mechanical seal sealing water of condensate pump |
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| CN219299597U true CN219299597U (en) | 2023-07-04 |
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| CN202320125935.7U Active CN219299597U (en) | 2023-01-17 | 2023-01-17 | Recovery device for mechanical seal sealing water of condensate pump |
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- 2023-01-17 CN CN202320125935.7U patent/CN219299597U/en active Active
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