CN210240556U - Oil-free seal single-end-face water mechanical seal - Google Patents
Oil-free seal single-end-face water mechanical seal Download PDFInfo
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- CN210240556U CN210240556U CN201921147109.2U CN201921147109U CN210240556U CN 210240556 U CN210240556 U CN 210240556U CN 201921147109 U CN201921147109 U CN 201921147109U CN 210240556 U CN210240556 U CN 210240556U
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- flushing
- sleeve
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Abstract
The utility model discloses an oil-free seal single end face water mechanical seal, a flushing water jacket is fixedly sleeved on a static ring, and the rear end of the flushing water jacket is provided with an end cover; a water inlet and a water outlet are formed in the washing water sleeve; the flushing water jacket, the shaft sleeve and the static ring form a water accumulation cavity in an enclosing manner; the guide sleeve is arranged between the static ring and the shaft sleeve; a narrow washing water channel reaching the water accumulation cavity is formed between the guide sleeve and the static ring, and a wide washing water channel reaching the water accumulation cavity is formed between the guide sleeve and the shaft sleeve; the cross-sectional area of the narrow flushing water flow passage is smaller than that of the wide flushing water flow passage; and a water retaining ring in contact with the shaft sleeve is embedded in the end cover. The mechanical seal with the structure utilizes the soft water retaining ring without radial compression to replace a framework oil seal to seal flushing water. The compression abrasion of the framework oil seal to the shaft sleeve due to the sealing requirement is avoided, and the service life of the mechanical seal is prolonged.
Description
Technical Field
The utility model relates to a mechanical seal.
Background
The mechanical seal is a shaft seal device of a rotating machine. Such as centrifugal pumps, centrifuges, reaction kettles, compressors, and the like. Since the drive shaft extends through the inside and outside of the apparatus, there is a circumferential gap between the shaft and the apparatus through which the medium in the apparatus leaks out, and if the pressure in the apparatus is lower than atmospheric pressure, air leaks into the apparatus, so that a shaft seal device must be provided to prevent leakage. The shaft seal has many kinds, and the mechanical seal has the advantages of small leakage amount, long service life and the like, so the mechanical seal is the most important shaft sealing mode in the devices in the world. Mechanical seals, also called face seals, are defined in the relevant national standards as follows: "means for preventing fluid leakage, which is composed of at least one pair of end faces perpendicular to the rotation axis, and which are kept in fit and relatively slide under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism and the cooperation of the auxiliary seal. "
Since sealing surface friction generates a lot of heat and media leakage also deposits particulate impurities inside the mechanical seal, flushing water is needed to flush the inside of the mechanical seal. Some mechanical seals need to be provided with a framework oil seal at the rear end to seal flushing water. And an extension spring is arranged in the framework oil seal and enables the framework oil seal to be always in contact with the shaft sleeve. The shaft sleeve is rotary, and the framework oil seal does not rotate. The sleeve wears over time.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an there is not oily single-end face to have water mechanical seal, utilizes the water retaining ring that the counter shaft sleeve does not have the oppression to replace the skeleton oil blanket to seal washing water.
In order to solve the technical problem, the technical scheme of the utility model is to adopt an oil-free single-end-face water mechanical seal, which comprises a shaft sleeve fixedly sleeved on a main shaft, a movable ring and a static ring which are matched with each other to seal, wherein the movable ring is fixed on the shaft sleeve by a movable ring seat, and the static ring is connected with a pump shell by a flushing water jacket; a compensation spring is arranged at the rear end of the static ring; a semi-dividing ring for positioning is arranged at the rear end of the shaft sleeve; the flushing water jacket is fixedly sleeved on the stationary ring, and the rear end of the flushing water jacket is provided with an end cover; a water inlet and a water outlet are formed in the washing water sleeve; the flushing water jacket, the shaft sleeve and the static ring form a water accumulation cavity in an enclosing manner; the guide sleeve is arranged between the static ring and the shaft sleeve; a narrow washing water channel reaching the water accumulation cavity is formed between the guide sleeve and the static ring, and a wide washing water channel reaching the water accumulation cavity is formed between the guide sleeve and the shaft sleeve; the cross-sectional area of the narrow flushing water flow passage is smaller than that of the wide flushing water flow passage; and a water retaining ring in contact with the shaft sleeve is embedded in the end cover.
As an improvement, a water blocking ring is arranged in front of a water retaining ring in the water accumulation cavity on the shaft sleeve, and a gap is formed between the outer annular surface of the water blocking ring and the flushing water jacket. The water blocking ring is arranged in front of the water retaining ring, so that the direct impact of flushing water flowing out of the wide flushing water channel on the water retaining ring is avoided to cause the leakage of the flushing water.
As an improvement, the section of the water-blocking ring is in a step shape with a low front part and a high rear part. And the flushing water is blocked step by step, and the flushing water can smoothly enter the water outlet.
As an improvement, the water outlet faces the water-blocking ring.
As a further improvement, the water retaining ring is made of wool felt. Wool felt is softer in texture and more wear resistant.
As another further improvement, the aperture of the water inlet is smaller than that of the water outlet. Further reducing the pressure of the effluent.
The utility model discloses an useful part lies in: the mechanical seal with the structure utilizes the soft water retaining ring without radial compression to replace a framework oil seal to seal flushing water. The compression abrasion of the framework oil seal to the shaft sleeve due to the sealing requirement is avoided, and the service life of the mechanical seal is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The labels in the figure are: 1 water retaining ring, 2 water blocking rings, 3 water inlets, 4 narrow flushing water flow channels, 5 wide flushing water flow channels, 6 water outlets, 7 shaft sleeves, 8 static rings, 9 flow guide sleeves, 10 water collecting cavities, 11 semi-dividing rings, 12 flushing water jackets and 13 moving rings.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the specific embodiments.
As shown in fig. 1, the utility model comprises a shaft sleeve 7 fixedly sleeved on a main shaft, a movable ring 13 and a stationary ring 8 which are mutually matched for sealing, wherein the movable ring 13 is fixed on the shaft sleeve 7 by a movable ring seat, and the stationary ring 8 is connected with a pump shell by a flushing water jacket 12; a compensation spring is arranged at the rear end of the static ring 8; a semi-dividing ring 11 for positioning is arranged at the rear end of the shaft sleeve 7; the flushing water jacket 12 is fixedly sleeved on the stationary ring 8, and the rear end of the flushing water jacket is provided with an end cover; the flushing water sleeve is provided with a water inlet 3 and a water outlet 6; the aperture of the water inlet 3 is smaller than that of the water outlet 6. The flushing water jacket 12, the shaft sleeve 7 and the static ring 8 enclose a water accumulation cavity 10; the guide sleeve 9 is arranged between the static ring 8 and the shaft sleeve 7; a narrow washing water channel 4 which reaches the water accumulation cavity 10 is formed between the guide sleeve 9 and the static ring 8, and a wide washing water channel 5 which reaches the water accumulation cavity 10 is formed between the guide sleeve 9 and the shaft sleeve 7; the cross-sectional area of the narrow rinsing water flow passage 4 is smaller than that of the wide rinsing water flow passage 5; and a water retaining ring 1 in contact with the shaft sleeve 7 is embedded in the end cover. The water retaining ring 1 is made of wool felt.
The water blocking ring 2 is arranged in the shaft sleeve 7 in front of the water retaining ring 1 in the water accumulation cavity 10, and a gap is formed between the outer annular surface of the water blocking ring 2 and the washing water jacket 12. The section of the water-blocking ring 2 is in a step shape with a low front part and a high back part. The water outlet 6 is opposite to the water-blocking ring 2.
When the sealing device works, the movable ring 13 and the static ring 8 are matched and sealed. The flushing water enters the water collecting chamber 10 from the water inlet 3. The aperture of the water inlet 3 is small, and the water inlet is used for controlling the flow and the speed. The washing water in the water collecting cavity 10 enters the narrow washing water channel 4, so that the washing water has high flow speed and pressure, and the static ring 8 is convenient to wash and take away heat. The rear end of the narrow washing water flow passage 4 communicates with the front end of the wide washing water flow passage 5, so that the washing water directly flows from the narrow washing water flow passage 4 into the wide washing water flow passage 5, so that the washing water is returned to the sump chamber 10 after the flow rate and pressure of the washing water are reduced. Due to the presence of the water-blocking ring 2, the flushing water cannot directly impact the soft water-retaining ring 1, and the water-blocking ring 2 can guide the flushing water into the water outlet 6. The water retaining ring 1 is used for performing auxiliary sealing on flushing water, and the flushing water is prevented from leaking from one end of the semi-parting ring 11. Meanwhile, the water retaining ring also has the function of dust prevention.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (6)
1. An oil-seal-free single-end-face hydromechanical seal comprises a shaft sleeve fixedly sleeved on a main shaft, a movable ring and a static ring which are matched with each other to seal, wherein the movable ring is fixed on the shaft sleeve by virtue of a movable ring seat, and the static ring is connected with a pump shell by virtue of a washing water jacket; a compensation spring is arranged at the rear end of the static ring; a semi-dividing ring for positioning is arranged at the rear end of the shaft sleeve; the method is characterized in that: the flushing water jacket is fixedly sleeved on the stationary ring, and the rear end of the flushing water jacket is provided with an end cover; a water inlet and a water outlet are formed in the washing water sleeve; the flushing water jacket, the shaft sleeve and the static ring form a water accumulation cavity in an enclosing manner; the guide sleeve is arranged between the static ring and the shaft sleeve; a narrow washing water channel reaching the water accumulation cavity is formed between the guide sleeve and the static ring, and a wide washing water channel reaching the water accumulation cavity is formed between the guide sleeve and the shaft sleeve; the cross-sectional area of the narrow flushing water flow passage is smaller than that of the wide flushing water flow passage; and a water retaining ring in contact with the shaft sleeve is embedded in the end cover.
2. An oil-free single-ended mechanical seal according to claim 1, wherein: and a water blocking ring is arranged on the shaft sleeve in front of the water retaining ring in the water accumulation cavity, and a gap is formed between the outer annular surface of the water blocking ring and the flushing water jacket.
3. An oil-free single-ended mechanical seal according to claim 2, wherein: the section of the water-blocking ring is in a step shape with a low front part and a high back part.
4. An oil-free single-ended mechanical seal according to claim 2, wherein: the water outlet is opposite to the water-blocking ring.
5. An oil-free single-ended mechanical seal according to claim 1, wherein: the water retaining ring is made of wool felt.
6. An oil-free single-ended mechanical seal according to claim 1, wherein: the aperture of the water inlet is smaller than that of the water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921147109.2U CN210240556U (en) | 2019-07-19 | 2019-07-19 | Oil-free seal single-end-face water mechanical seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921147109.2U CN210240556U (en) | 2019-07-19 | 2019-07-19 | Oil-free seal single-end-face water mechanical seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210240556U true CN210240556U (en) | 2020-04-03 |
Family
ID=69992265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921147109.2U Active CN210240556U (en) | 2019-07-19 | 2019-07-19 | Oil-free seal single-end-face water mechanical seal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210240556U (en) |
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2019
- 2019-07-19 CN CN201921147109.2U patent/CN210240556U/en active Active
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