CN210739385U - Energy-saving shaft seal heater - Google Patents
Energy-saving shaft seal heater Download PDFInfo
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- CN210739385U CN210739385U CN201921648802.8U CN201921648802U CN210739385U CN 210739385 U CN210739385 U CN 210739385U CN 201921648802 U CN201921648802 U CN 201921648802U CN 210739385 U CN210739385 U CN 210739385U
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Abstract
The utility model belongs to the technical field of heaters, in particular to an energy-saving shaft seal heater, which comprises a shaft seal heater body and a pipeline, wherein one end of the pipeline is connected with a water outlet of a water jet air ejector, the other end of the pipeline is connected with an air outlet of the shaft seal heater body, and a valve is arranged on the pipeline; an expandable sealing ring is arranged at the joint of the pipeline and the valve, an annular cavity is formed in the expandable sealing ring, and an air bag is arranged in the annular cavity. The water jet air ejector can generate negative pressure in the shaft seal heater body, an air exhauster does not need to be additionally arranged, energy required by the work of the air exhauster does not need to be consumed, and the problem that the work of the existing shaft seal heater consumes too much energy can be effectively solved.
Description
Technical Field
The utility model belongs to the technical field of the heater, concretely relates to energy-conserving bearing seal heater.
Background
When the steam turbine runs, a proper gap is required to be left between the rotor and the cylinder so as not to collide with each other; however, the existence of the gap can cause steam leakage, so that the efficiency of the unit is reduced, and the safe operation of the unit is influenced. To prevent or reduce this, steam seals are provided at both ends of the rotor through the cylinder, and are called shaft end steam seals, or shaft seals for short.
Although the shaft seal can reduce the steam leakage, the steam leakage of the shaft seal cannot be completely eliminated. The shaft seal heater is the equipment that the gland seal leaked steam of retrieving that the power plant generally used, can retrieve the gland seal and leak steam and utilize its heat to heat the condensate water, effectively reduces energy loss, improves the unit thermal efficiency. The existing shaft seal heater specifically operates as follows, the exhaust fan is connected with an exhaust port of the shaft seal heater, the exhaust fan needs to be continuously opened in the operation process of the shaft seal heater, and the exhaust fan is used for pumping out gas in the shaft seal heater to maintain negative pressure in the shaft seal heater so as to realize recovery of shaft seal steam leakage. The shaft seal leakage steam is condensed into condensed water in the shaft seal heater, and the condensed water is mainly discharged through a drain port of the shaft seal heater. The drain port of the shaft seal heater is connected with the condenser, and the water injection air extractor provides negative pressure for the condenser, so that the condenser can smoothly recover condensed water in the shaft seal heater. Although the existing shaft seal heater recovers some heat energy, the exhaust fan needs to work continuously, and more electric energy is consumed.
SUMMERY OF THE UTILITY MODEL
The utility model provides an energy-conserving bearing seal heater to solve the too much problem of current bearing seal heater work consumption energy.
In order to achieve the above purpose, the utility model discloses a scheme does: the energy-saving shaft seal heater comprises a shaft seal heater body and a pipeline, wherein one end of the pipeline is connected to a water drainage port of the water jet air ejector, the other end of the pipeline is connected to an air exhaust port of the shaft seal heater body, and a valve is arranged on the pipeline; an expansion sealing ring is arranged at the joint of the pipeline and the valve, an annular cavity is formed in the expansion sealing ring, and an air bag is arranged in the annular cavity.
The working principle and the beneficial effects of the scheme are as follows: the shaft seal heater body is connected with the water outlet of the water jet air extractor through a pipeline, vacuum is established at the water outlet by using the residual speed of water of the water jet air extractor, and the water outlet is connected with the air outlet of the shaft seal heater body, so that vacuum is established in the shaft seal heater body, and the purpose of sucking shaft seal leakage steam into the shaft seal heater body is achieved. Through the arrangement, negative pressure can be generated in the shaft seal heater body by utilizing the water jet air ejector, an exhaust fan does not need to be additionally arranged, energy required by the work of the exhaust fan does not need to be consumed, and the problem that the work of the conventional shaft seal heater consumes too much energy can be effectively solved.
Set up the inflation sealing ring, the surface and valve, the pipeline contact of inflation sealing ring are equipped with the gasbag in the inflation sealing ring, through the inflation degree of the steerable inflation sealing ring of the size of adjusting the gasbag for the inflation sealing ring can closely laminate with valve, pipeline, effectively strengthens the leakproofness between valve and the pipeline, avoids gas leakage.
Optionally, the shaft seal heater body is arranged above the condenser, a vertically arranged drain pipe is connected between the shaft seal heater body and the condenser, and a steam trap is arranged in the drain pipe; the steam trap comprises a fixed valve seat, a water through hole is formed in the fixed valve seat, a valve core is connected in the water through hole in a sliding mode, and the longitudinal section of the valve core is in a trapezoid shape with a small upper end and a large lower end; an elastic piece is connected between the valve core and the inner wall of the drain pipe, and under the action of the elastic piece, the valve core is fixed on the fixed valve seat and blocks the water through port.
The steam trap of the scheme is arranged on a vertical drain pipe, condensed water in the shaft seal heater body flows into the drain pipe under the action of gravity and finally accumulates above the steam trap, the downward acting force exerted by water on the valve core is larger along with the increasing accumulated water, when the accumulated water reaches a certain degree, the valve core moves downwards under the combined action of the negative pressure of the steam trap and the gravity of the accumulated water (when the valve core is only under the upward acting force exerted by the elastic element, the negative pressure in the steam trap is not enough to enable the valve core to overcome the acting force of the elastic element and slide downwards), the valve core overcomes the acting force of the elastic element and moves downwards, the water through opening is partially opened, the accumulated water flows downwards through the water through opening, and the water is finally sucked by the steam trap. When the accumulated water is reduced to a certain amount, the valve core recovers to the original position under the action of the elastic element, and the water through port is continuously plugged. Because the accumulated water exists above the steam trap all the time, the gas in the shaft seal heater body can be effectively prevented from being discharged through the water through port.
Optionally, a sliding groove is formed in the inner wall of the fixed valve seat, and a protrusion which is clamped in the sliding groove and can slide up and down along the sliding groove is arranged on the valve core. The sliding groove has a guiding function on the valve core, so that the valve core can move along a fixed track when stressed, and the stability of the valve core is enhanced.
Optionally, the chute is dovetail-shaped in cross-section. The cross section of the sliding groove is arranged to be dovetail-shaped, the protrusion is clamped in the sliding groove and can only slide along the sliding groove without falling off, and the valve core can be effectively prevented from falling off from the fixed valve seat.
Optionally, the valve core is in a circular truncated cone shape.
Optionally, the resilient member is a spring.
Optionally, a sealing ring which can be attached to the water passage port is fixed on the valve core. The sealing ring is arranged, so that the sealing performance between the valve core and the fixed valve seat can be enhanced, and the sealing liquid leaks.
Optionally, an exhaust fan is connected to the exhaust port of the shaft seal heater body through an air pipe. And the exhaust fan is arranged, and when the water jet air extractor does not work, the negative pressure state in the shaft seal heater body can be kept through the exhaust fan.
Optionally, two sides below the shaft seal heater body are respectively provided with a support platform for supporting the shaft seal heater body. The supporting table is arranged, so that the shaft seal heater body is more stable in the working process.
Optionally, the support table comprises a fixed plate, a reinforcing rib and a vertical plate fixed on the fixed plate, and the upper surface of the vertical plate is in an arc shape attached to the lower surface of the shaft seal heater body; one end of the reinforcing rib is fixed on the fixing plate, and the other end of the reinforcing rib is fixed on the vertical plate. Through setting up the strengthening rib, can improve the intensity and the stability of brace table.
Drawings
Fig. 1 is a schematic structural view of an energy-saving shaft seal heater according to a first embodiment of the present invention;
fig. 2 is a cross-sectional view of an expansion seal ring in an energy-saving shaft seal heater according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an energy-saving shaft seal heater according to a second embodiment of the present invention;
fig. 4 is a sectional view of a steam trap in an energy-saving shaft seal heater according to a second embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the water-jet air extractor comprises a shaft seal heater body 10, a water-jet air extractor 20, a pipeline 21, a valve 22, an exhaust fan 30, an air pipe 31, a condenser 40, a drain pipe 41, a fixing plate 50, a reinforcing rib 51, a vertical plate 52, a fixing valve seat 60, a sliding groove 61, a spring 70, a valve core 80, a protrusion 81, a sealing ring 82, an expansion sealing ring 90, an air bag 91 and an annular cavity 92.
Example one
This embodiment is substantially as shown in fig. 1: energy-conserving bearing seal heater is including bearing seal heater body 10 and pipeline 21, and the one end of pipeline 21 is connected in the drain outlet department of penetrating water air ejector 20, and the other end is connected in the exhaust outlet department of bearing seal heater body 10, and in this embodiment, pipeline 21 is the welding with the concrete connected mode of penetrating water air ejector 20, bearing seal heater body 10. The pipe 21 is provided with a valve 22, and the size of the extracted steam can be adjusted by controlling the valve 22. An expansion sealing ring 90 is installed at the joint of the pipeline 21 and the valve 22, as shown in fig. 2, an annular cavity 92 is formed in the expansion sealing ring 90, the section of the annular cavity 92 is in a "T" shape, and an air bag 91 is placed in the annular cavity 92.
In this embodiment, the shaft seal heater body 10 is connected to the water outlet of the water jet ejector 20 through the pipe 21, and the residual water speed of the water jet ejector 20 is used to create a vacuum at the water outlet, and since the water outlet is connected to the air outlet of the shaft seal heater body 10, a vacuum is created in the shaft seal heater body 10, so as to suck the shaft seal leakage steam into the shaft seal heater body 10. Through the arrangement, negative pressure can be generated in the shaft seal heater body 10 by utilizing the water jet air ejector 20, the additional arrangement of the exhaust fan 30 is not needed, the energy required by the operation of the exhaust fan 30 is not needed, and the problem of excessive energy consumption in the operation of the conventional shaft seal heater can be effectively solved.
Set up inflation sealing ring 90, inflation sealing ring 90's surface and valve 22, pipeline 21 contact are equipped with gasbag 91 in the inflation sealing ring 90, through the steerable inflation degree of inflation sealing ring 90 of the size of adjusting gasbag 91 for inflation sealing ring 90 can closely laminate with valve 22, pipeline 21, effectively strengthens the leakproofness between valve 22 and the pipeline 21, avoids gas leakage.
Example two
As shown in fig. 3, the energy-saving shaft seal heater includes a shaft seal heater body 10 and a pipe 21, one end of the pipe 21 is connected to a water outlet of the water jet ejector 20, and the other end is connected to an air outlet of the shaft seal heater body 10, in this embodiment, the specific connection mode is welding. The pipe 21 is provided with a valve 22, and the size of the extracted steam can be adjusted by controlling the valve 22. An expansion sealing ring 90 is arranged at the joint of the pipeline 21 and the valve 22, an annular cavity 92 is arranged in the expansion sealing ring 90, and an air bag 91 is arranged in the annular cavity 92. An exhaust fan 30 is further connected to the exhaust port of the shaft seal heater body 10 through an air pipe 31, and when the water jet air ejector 20 does not operate, the interior of the shaft seal heater body 10 can be maintained in a negative pressure state by the exhaust fan 30.
The shaft seal heater body 10 is located above the condenser 40, a vertically arranged drain pipe 41 is connected between the shaft seal heater body 10 and the condenser 40, and the drain pipe 41 is provided with a steam trap. As shown in fig. 4, the steam trap includes a fixed valve seat 60 installed in the drain pipe 41, a water passage opening is opened on the fixed valve seat 60, a valve core 80 is slidably connected in the water passage opening, and the specific connection mode is as follows: the inner wall of the fixed valve seat 60 is provided with a slide groove 61 (in the present embodiment, the slide groove 61 has a dovetail-shaped cross section), and the valve body 80 is fixed with a protrusion 81 which is engaged in the dovetail groove and can slide up and down along the slide groove 61. The cross section of the valve core 80 is a trapezoid with a small upper end and a large lower end, in the embodiment, the valve core 80 is a circular table, and a sealing ring 82 which can be attached to the water through opening is fixed on the valve core 80. An elastic member is connected between the upper surface of the valve core 80 and the inner wall of the drain pipe 41, the elastic member is a spring 70, and under the action of the spring 70, the valve core 80 is fixed on the fixed valve seat 60 and seals the water passage port.
Support tables are respectively provided on the left and right sides below the shaft seal heater body 10, and the support tables are used for supporting the shaft seal heater body 10. The support table comprises a fixed plate 50, a reinforcing rib 51 and a vertical plate 52 welded on the fixed plate 50, wherein the upper surface of the vertical plate 52 is in an arc shape attached to the lower surface of the shaft seal heater body 10; one end of the reinforcing rib 51 is welded on the fixing plate 50, the other end is welded on the vertical plate 52, and an included angle of 60 degrees is formed between the reinforcing rib 51 and the fixing plate 50.
The existing shaft seal heater uses multi-stage water seal U-shaped pipes, and the multi-stage water seal U-shaped pipes are arranged on the drainage pipelines of the shaft seal heater body 10 and the condenser 40, and the multi-stage water seal substantially increases the resistance of drainage backwater. During normal operation, theoretically, the drain water of the shaft seal heater body 10 passes through the multi-stage water seal U-shaped pipe and then returns to the steam side of the condenser 40 from a certain height, and the flow resistance plus the height difference is just equal to the vacuum of the condenser 40. However, in actual operation, the working condition often changes, the vacuum of the condenser 40 is not constant, and the following two situations easily occur due to the adoption of the multi-stage water-sealed U-shaped tube: one is that when the flow resistance is too great, the hydrophobic backwater of the shaft seal heater is not smooth: secondly, when the backwater resistance is small, vacuum leakage is easily caused.
The steam trap of the scheme is arranged on a vertical drain pipe 41, condensed water in the shaft seal heater body 10 flows into the drain pipe 41 under the action of gravity and finally accumulates above the steam trap, the downward acting force exerted by the water on the valve core 80 is larger along with the increasing accumulated water, when the accumulated water reaches a certain degree, the valve core 80 moves downwards under the combined action of the negative pressure of the steam condenser 40 and the gravity of the accumulated water (when the valve core 80 is only under the upward acting force exerted by the elastic part, the negative pressure in the steam condenser 40 is not enough to enable the valve core 80 to overcome the acting force of the spring 70 and slide downwards), the valve core 80 overcomes the acting force of the spring 70, the water through opening is partially opened, the accumulated water flows downwards through the water through opening, and the water is finally sucked by the steam condenser 40. When the accumulated water is reduced to a certain amount, the valve core 80 is restored to the original position under the action of the spring 70, and the water through port is continuously blocked. Because the accumulated water exists above the steam trap all the time, the gas in the shaft seal heater body 10 can be effectively prevented from being discharged through the water through port, and the vacuum leakage can also be avoided. With the steam trap of this configuration, even if the vacuum of the steam trap 40 is not constant, the amount of accumulated water above the steam trap can be dynamically controlled to prevent vacuum leakage.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be pointed out that to those skilled in the art, without departing from the structure of the present invention, a plurality of modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the utility of the present invention.
Claims (10)
1. Energy-conserving bearing seal heater, its characterized in that: the water jet air ejector comprises a shaft seal heater body and a pipeline, wherein one end of the pipeline is connected to a water outlet of the water jet air ejector, the other end of the pipeline is connected to an air outlet of the shaft seal heater body, and a valve is arranged on the pipeline; an expansion sealing ring is arranged at the joint of the pipeline and the valve, an annular cavity is formed in the expansion sealing ring, and an air bag is arranged in the annular cavity.
2. The energy saving shaft seal heater according to claim 1, wherein: the shaft seal heater body is arranged above the condenser, a vertically arranged drain pipe is connected between the shaft seal heater body and the condenser, and a steam trap is arranged in the drain pipe; the steam trap comprises a fixed valve seat, a water through hole is formed in the fixed valve seat, a valve core is connected in the water through hole in a sliding mode, and the longitudinal section of the valve core is in a trapezoid shape with a small upper end and a large lower end; an elastic piece is connected between the valve core and the inner wall of the drain pipe, and under the action of the elastic piece, the valve core is fixed on the fixed valve seat and blocks the water through port.
3. The energy saving shaft seal heater according to claim 2, wherein: the inner wall of the fixed valve seat is provided with a sliding groove, and the valve core is provided with a bulge which is clamped in the sliding groove and can slide up and down along the sliding groove.
4. The energy saving shaft seal heater according to claim 3, wherein: the cross section of the sliding chute is in a dovetail shape.
5. The energy saving shaft seal heater according to claim 2, wherein: the valve core is in a round table shape.
6. The energy saving shaft seal heater according to claim 2, wherein: the elastic element is a spring.
7. The energy saving shaft seal heater according to claim 2, wherein: and a sealing ring which can be attached to the water through opening is fixed on the valve core.
8. The energy saving shaft seal heater according to any one of claims 1 to 7, wherein: an exhaust fan is connected with the exhaust port of the shaft seal heater body through an air pipe.
9. The energy saving shaft seal heater according to any one of claims 1 to 7, wherein: supporting platforms for supporting the shaft seal heater body are respectively arranged on two sides below the shaft seal heater body.
10. The energy saving shaft seal heater according to any one of claims 1 to 7, wherein: the supporting table comprises a fixed plate, a reinforcing rib and a vertical plate fixed on the fixed plate, and the upper surface of the vertical plate is in an arc shape attached to the lower surface of the shaft seal heater body; one end of the reinforcing rib is fixed on the fixing plate, and the other end of the reinforcing rib is fixed on the vertical plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921648802.8U CN210739385U (en) | 2019-09-29 | 2019-09-29 | Energy-saving shaft seal heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921648802.8U CN210739385U (en) | 2019-09-29 | 2019-09-29 | Energy-saving shaft seal heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210739385U true CN210739385U (en) | 2020-06-12 |
Family
ID=71005065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921648802.8U Active CN210739385U (en) | 2019-09-29 | 2019-09-29 | Energy-saving shaft seal heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210739385U (en) |
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2019
- 2019-09-29 CN CN201921648802.8U patent/CN210739385U/en active Active
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