CN119412502A - A low-speed dry friction mechanical seal and detection method - Google Patents
A low-speed dry friction mechanical seal and detection method Download PDFInfo
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- CN119412502A CN119412502A CN202510013793.9A CN202510013793A CN119412502A CN 119412502 A CN119412502 A CN 119412502A CN 202510013793 A CN202510013793 A CN 202510013793A CN 119412502 A CN119412502 A CN 119412502A
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- ring
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- mandrel
- seat
- movable ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3436—Pressing means
- F16J15/3452—Pressing means the pressing force resulting from the action of a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3464—Mounting of the seal
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3492—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member with monitoring or measuring means associated with the seal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Sealing (AREA)
Abstract
本发明属于机械密封领域，具体涉及一种低转速干摩擦机械密封及检测方法，转速范围0.5‑200r/min，包括芯轴、弹簧座、弹簧、动环座、动环、静环、压盖等，芯轴位于腔体内，相对腔体可进行转动；所述弹簧座及动环座设置于芯轴上，弹簧座与芯轴完全固定，动环座与芯轴周向保持固定；所述动环设置于动环座上，与动环座通过特殊工艺加工固定成一体；所述压盖位于腔体外端，通过螺栓与腔体固定连接；所述静环设置于压盖内，与压盖保持周向固定；所述动环端面与静环端面相贴合形成密封面。本结构密封效果更加可靠，且更加便于对结构进行在线检测和拆卸维护。
The present invention belongs to the field of mechanical seals, and specifically relates to a low-speed dry friction mechanical seal and a detection method, with a speed range of 0.5-200r/min, including a mandrel, a spring seat, a spring, a dynamic ring seat, a dynamic ring, a static ring, a gland, etc. The mandrel is located in a cavity and can rotate relative to the cavity; the spring seat and the dynamic ring seat are arranged on the mandrel, the spring seat is completely fixed to the mandrel, and the dynamic ring seat is circumferentially fixed to the mandrel; the dynamic ring is arranged on the dynamic ring seat, and is fixed to the dynamic ring seat through a special process; the gland is located at the outer end of the cavity and is fixedly connected to the cavity by bolts; the static ring is arranged in the gland and is circumferentially fixed to the gland; the end face of the dynamic ring fits with the end face of the static ring to form a sealing surface. The sealing effect of this structure is more reliable, and it is more convenient to perform online detection and disassembly maintenance of the structure.
Description
Technical Field
The invention belongs to the field of mechanical sealing, and particularly relates to a low-rotation-speed dry friction mechanical sealing and a detection method.
Background
The dry running gas seal in the mechanical sealing field is usually formed by opening various flow grooves with different shapes on the surface of a sealing ring, and the sealing end surface mainly comprises three parts of a flow groove, a sealing weir and a sealing dam, wherein the flow groove plays a pumping role to form a fluid film, so that the fluid film bearing capacity is generated, the sealing weir generates static and dynamic pressure bearing capacity of the fluid film to prevent leakage in the circumferential direction of the fluid, and the sealing dam generates static pressure bearing capacity of the fluid film to prevent leakage in the radial direction of the fluid.
According to the prior art, the Chinese patent publication No. CN213899889U, the authority date 2021-08-16 discloses a dry friction mechanical sealing device, which comprises a shaft, a shaft sleeve, a flange, a cavity piece and a gland, wherein a flow guide sleeve is arranged between the flange and the shaft, a first static ring is arranged between the flow guide sleeve and the flange, the first static ring is axially positioned through a first pressing plate, a second static ring and a throttling ring are arranged between the gland and the shaft sleeve, one side of the second pressing plate is provided with a driving ring, a first moving ring, a second moving ring and a strip are arranged between the cavity piece and the shaft sleeve, the gland is provided with a leakage guiding flushing channel, the gland, the second moving ring, the second static ring, the first moving ring, the first pressing plate and the cavity piece jointly encircle to form a sealing cavity, isolating gas is arranged in the sealing cavity, the pressure of the isolating gas is larger than that of the sealed gas, and the cavity piece is provided with an isolating gas inlet channel and an isolating gas outlet channel which are communicated with the sealing cavity, so that the sealing performance of the sealing device is greatly improved.
Although the above embodiment can prevent the sealed gas from leaking out to cause an accident. However, the dry running gas seal is often applied to equipment such as compressors with relatively high rotational speeds, and has low applicability when the rotational speeds are relatively low and a fluid film is difficult to form. The number of revolutions of the mechanical seal for the upper stirring kettle used in the medicine and food industry is 20-200r/min, the stirring kettle needs to be sealed to prevent leakage, in addition, the rotating speed of the mechanical penetration piece of the personnel gate of the nuclear power station is also low, the rotating speed of the mechanical seal of the mechanical penetration piece of the personnel gate of the nuclear power station is 0.5-200r/min, and the mechanical seal structure which keeps good sealing performance in a low-rotating-speed dry friction state is also needed.
Disclosure of Invention
The invention aims to provide a low-rotation-speed dry friction mechanical seal which can realize effective sealing in a rotation speed range of 0.5-200r/min in a state that end surfaces are in contact with dry friction so as to improve the sealing performance and the service life of equipment.
The invention provides a low-rotation-speed dry friction mechanical seal and a detection method, which comprise a mandrel, a spring seat, a movable ring, a gland, a stationary ring and a spring, wherein the mandrel is positioned in a cavity, the mandrel and the cavity are axially fixed relatively and circumferentially rotatable, the spring seat and the movable ring seat are arranged on the mandrel, the spring seat is completely fixed with the mandrel, the movable ring seat is circumferentially fixed with the mandrel, the movable ring is arranged on the movable ring seat and is circumferentially and axially fixed with the movable ring seat, the gland is positioned at the outer end of the cavity and is fixedly connected with the cavity through a bolt, and the stationary ring is arranged in the gland and is circumferentially fixed with the gland.
Preferably, the spring seat contacts with the spindle shoulder, a threaded through hole is formed in the spring seat, a set screw is arranged in the hole, and the spring seat and the spindle are completely fixed through the set screw.
Preferably, one end of the spring seat, which is far away from the spindle shaft shoulder, is provided with a plurality of counter bores with the bottoms facing, a plurality of springs are arranged in the bores, and two ends of each spring respectively prop against the counter bore bottoms of the spring seat and one end face, far away from the movable ring, of the movable ring seat.
Preferably, two shaft sealing rings are arranged between the movable ring seat and the mandrel, the shaft sealing rings are arranged in sealing ring grooves of the movable ring seat and are pressed by the mandrel, cylindrical pins are arranged between the movable ring seat and the mandrel, and the cylindrical pins are arranged on the mandrel and matched with the notch of the movable ring seat so that the mandrel and the movable ring seat are kept circumferentially fixed.
Preferably, the movable ring seat and the movable ring are fixed into a whole, the movable ring and the movable ring seat are kept circumferentially fixed through the fixed connection between the movable ring and the movable ring seat, and one surface of the movable ring far away from the movable ring seat is attached to one surface of the stationary ring far away from the gland through the spring seat, so that the end face sealing effect is realized.
Preferably, two stationary ring sealing rings are arranged between the stationary ring and the gland, and are installed in the sealing ring groove of the gland and are pressed by the stationary ring.
Preferably, a through hole is formed between the seal ring grooves of the two stationary ring seal rings of the gland and is communicated with the thread detection hole of the gland to serve as a first leakage detection channel, an axial blind hole and a radial blind hole are formed in the stationary ring to serve as a second leakage detection channel, the axial hole is concentric with the through hole on the movable ring, and the radial hole is concentric with the gland leakage detection channel hole.
Preferably, a gland sealing ring is arranged between the gland and the cavity, the gland sealing ring is arranged in a sealing ring groove of the gland, and the gland is pressed on the cavity through a bolt.
The invention provides a detection method of a low-rotation-speed dry friction mechanical seal, which comprises the following steps:
s1, connecting and installing air tightness detection equipment and a threaded detection hole on the gland, and setting relevant parameters of the air tightness detection equipment;
S2, injecting gas into the first leakage detection channel, and detecting the tightness of the gland and the stationary ring by adopting a stationary ring sealing ring after the gas fills the second leakage detection channel;
s3, continuing to inject gas into the first leakage detection channel, and after the gas pushes the stationary ring and the movable ring open, entering the third leakage detection channel, so as to detect the tightness between the movable ring and the stationary ring and the tightness between the mandrel and the movable ring seat.
The beneficial effects of the invention are as follows:
1. the invention provides a low-rotation-speed dry friction mechanical seal and a detection method.A movable ring sealing end face is integrally and fixedly connected with a movable ring seat. The structure has the characteristics of excellent sealing effect, high reliability, long service life and the like.
2. The leakage detection channel in the low-rotation-speed dry friction mechanical seal and the detection method provided by the invention is beneficial to on-line detection of the sealing performance of the mechanical seal, and the sealing performance is detected without the need of integrally disassembling the mechanical seal;
3. the low-rotation-speed dry friction mechanical seal and the detection method provided by the invention adopt a structure mode of a plurality of small springs, so that the whole stress of the dynamic seal assembly is more uniform, the good fitting state of the seal end face is maintained, the stability of the mechanical seal is improved, and the service life of the mechanical seal is prolonged;
4. the low-rotation-speed dry friction mechanical seal and the detection method provided by the invention have the advantages of simple disassembly and assembly process and convenience in maintenance and replacement.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of a structure according to an embodiment of the present invention;
FIG. 2 shows a schematic cross-sectional view of a mandrel according to an embodiment of the present invention;
FIG. 3 illustrates a cross-sectional view of a movable ring mount according to an embodiment of the present invention;
Fig. 4 shows an enlarged schematic view of a structure at a according to an embodiment of the present invention.
In the figure, 1, a cavity; 2, a spring seat, 3, a set screw, 4, a cylindrical pin, 5, a movable ring seat, 7, a movable ring, 8, a static ring, 9, an anti-rotation pin, 10, a gland, 11, a bolt, 12, a static ring sealing ring, 13, a gland sealing ring, 14, a first movable ring sealing ring, 15, a shaft sealing ring, 16, a second movable ring sealing ring, 17, a spring, 18 and a mandrel.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in further detail below with reference to the drawings and examples.
As shown in figures 1 to 4, the low-rotation-speed dry friction mechanical seal provided by the invention comprises a mandrel 18, a spring seat 2, a movable ring seat 5, a movable ring 7, a gland 10, a static ring 8, a spring 17 and the like, wherein the mandrel 18 is positioned in a cavity 1, the mandrel 18 and the cavity 1 are relatively fixed in the axial direction and can rotate in the circumferential direction, the spring seat 2 and the movable ring seat 5 are arranged on the mandrel 18, the spring seat 2 is completely fixed with the mandrel 18, the movable ring seat 5 and the mandrel 18 are circumferentially fixed, the movable ring 7 is arranged on the movable ring seat 5 and is circumferentially and axially fixed with the movable ring seat 5, the two parts are integrally connected and fixed together, particularly can be adhered and the like, the two parts are completely fixed, so that the matching failure caused by arranging a positioning pin and a sealing ring and the failure caused by vibration and friction in the use process are reduced, the gland 10 is positioned at the outer end of the cavity 1 and fixedly connected with the cavity 1 through a bolt 11, the static ring 8 is arranged in the gland 10 and is circumferentially fixed with the gland 10, and the movable ring 7 is in contact with the end face of the movable ring 8, so that the end face sealing effect is realized.
Further, the spring seat 2 is in shaft shoulder contact with the mandrel 18, a threaded through hole is formed in the spring seat 2, a set screw 3 is arranged in the hole, complete fixation is achieved through the set screw 3 and the mandrel 18, a plurality of countersinks with bottoms facing away from the mandrel 18 are formed in one end of the spring seat 2, a plurality of springs 17 are arranged in the hole, two ends of each spring 17 respectively support against the bottom of the countersinks of the spring seat 2 and one surface, away from the moving ring 7, of the moving ring seat 5, stable spring 17 force is provided for the contact end face of the moving ring 7 and the stationary ring 8, and the moving ring 7 has certain compensation capability after abrasion.
Further, two shaft sealing rings 15 are arranged between the movable ring seat 5 and the mandrel 18, the shaft sealing rings 15 are installed in sealing ring grooves of the movable ring seat 5 and are pressed by the mandrel 18 to form sealing points, cylindrical pins 4 are arranged between the movable ring seat 5 and the mandrel 18, the cylindrical pins 4 are arranged on the mandrel 18 and are matched with anti-rotation pin 9 grooves of the movable ring seat 5, the mandrel 18 and the movable ring seat 5 are kept circumferentially fixed, a first movable ring sealing ring 14 and a second movable ring sealing ring 16 are arranged between the movable ring seat 5 and the movable ring 7 and are installed in the sealing ring grooves of the movable ring seat 5, the sealing points are formed by pressing the movable ring 7, two anti-rotation pins 9 are arranged between the movable ring seat 5 and the movable ring 7, and the anti-rotation pins 9 are matched with two pin holes of the movable ring 7, which are far away from the end face of the stationary ring 8, so that the movable ring 7 and the movable ring seat 5 are kept circumferentially fixed.
Further, an annular groove is formed between the seal grooves of the two shaft seal rings 15 of the movable ring seat 5, and a through hole is formed between the seal grooves of the first movable ring seal ring 14 and the second movable ring seal ring 16 and is communicated with the annular groove to serve as a leakage detection channel.
Further, the end surface of the moving ring 7 far away from the moving ring seat 5 is processed with a circular groove to form a radial double-end surface structure, a through hole is processed in the groove, and the hole position is concentric with the through hole on the moving ring seat 5 and is used as a leakage detection channel.
Further, two stationary ring sealing rings 12 are arranged between the stationary ring 8 and the gland 10, the stationary ring sealing rings 12 are installed in sealing ring grooves of the gland 10 and are pressed by the stationary ring 8 to form sealing points, and an anti-rotation pin 9 is installed on the gland 10 and is matched with a notch at one end, far away from the movable ring 7, of the stationary ring 8, so that the stationary ring 8 and the gland 10 are kept circumferentially fixed.
Further, a through hole is formed between the seal grooves of the two stationary ring seals 12 of the gland 10 and penetrates through the screw detection hole of the gland 10 as a first leak detection passage.
Further, an axial blind hole and a radial blind hole are machined in the static ring 8 and serve as second leakage detection channels, the axial holes are concentric with the through holes in the dynamic ring 7, and the radial holes are concentric with the leakage detection channel holes of the gland 10.
Further, a gland sealing ring 13 is arranged between the gland 10 and the cavity 1, the gland sealing ring 13 is arranged in a sealing ring groove of the gland 10, and the gland 10 is pressed on the cavity 1 through a bolt 11 to form a sealing point.
The invention provides a detection method of a low-rotation-speed dry friction mechanical seal, which comprises the following steps:
s1, connecting and installing air tightness detection equipment and a threaded detection hole on a gland 10, and setting relevant parameters of the air tightness detection equipment;
In this step, the air tightness detection device may specifically be composed of an air compressor, an air storage tank, and corresponding meters and valves, and the air pressure value of the mechanical seal is set according to the detection procedure, so as to perform online detection on the sealing performance of the mechanical seal.
S2, after the first leakage detection channel is filled with gas and the second leakage detection channel is filled with gas, detecting the gland 10 and the stationary ring 8, and detecting the tightness of the sealing performance of the stationary ring sealing ring 12;
In this step, there are two cases where the outlet end of the second leak detection channel is directly aligned with and in communication with the third leak detection channel, the gas will directly fill the third leak detection channel, and after filling the third leak detection channel, the air tightness between the stationary ring 8 and the gland 10 is detected, and when the second leak detection channel is not aligned with the third leak detection channel, the outer cross section of the moving ring 7 will seal the second leak detection channel, so that the air tightness between the stationary ring 8 and the gland 10 is detected.
And S3, continuously injecting gas into the first leakage detection channel, and after the gas pushes the stationary ring 8 and the movable ring 7 open, entering the third leakage detection channel, so as to detect the tightness between the movable ring 7 and the stationary ring 8 and the tightness between the detection mandrel 18 and the movable ring seat 5.
In this step, when the second leak detection channel is directly aligned with and communicated with the third leak detection channel, the gas will separate the stationary ring 8 from the movable ring 7, so as to fill the cavity, and then the mandrel 18 is detected, when the second leak detection channel is not aligned with the third leak detection channel, the gas will push up the space between the movable ring 7 and the stationary ring 8, and then the cavity is filled with gas, and finally the third leak detection channel is filled with gas to detect the air tightness of the mandrel 18.
The detection method for the low-rotation-speed dry friction mechanical seal provided by the embodiment of the invention has the following working principle:
The integrated fixing of the movable ring 7 and the movable ring seat 5 further improves the reliability of the whole equipment, an online detection structure which is favorable for detecting the sealing performance of the mechanical seal is formed through the mutual matching of the first leakage detection channel, the second leakage detection channel and the third leakage detection channel, the mechanical seal is not required to be integrally disassembled for detection, the convenience of the structure is further improved, the stress among the structures is more uniform and stable through the installation of the springs 17, the influence of factors such as vibration, deflection and eccentricity can be effectively reduced, the sealing end face contact is in a good state, the good wearing state of the end face can be kept, the service time and the stability of the mechanical seal are prolonged, the movable ring 7 and the stationary ring 8 are detachable, the disassembly and assembly process is simple, and the maintenance and replacement work is convenient.
Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications may be made to the technical solutions described in the foregoing embodiments or equivalents may be substituted for some of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention in essence of the corresponding technical solutions.
Claims (10)
1. A low-rotation-speed dry friction mechanical seal, which comprises a mandrel (18), a spring seat (2), a movable ring seat (5), a movable ring (7), a gland (10), a stationary ring (8) and a spring (17), and is characterized in that,
The mandrel (18) is positioned in the cavity (1), and the mandrel (18) and the cavity (1) are axially fixed relatively and can rotate circumferentially;
the spring seat (2) and the movable ring seat (5) are arranged on the mandrel (18), the spring seat (2) and the mandrel (18) are completely fixed, and the movable ring seat (5) and the mandrel (18) are circumferentially kept fixed;
The movable ring (7) is arranged on the movable ring seat (5), and the movable ring (7) and the movable ring seat (5) are mutually locked along the radial direction and the axial direction through fixed connection;
the gland (10) is positioned at the outer end of the cavity (1) and is fixedly connected with the cavity (1);
The static ring (8) is arranged in the gland (10) and is kept circumferentially fixed with the gland (10).
2. The low-rotation-speed dry friction mechanical seal according to claim 1, wherein the spring seat (2) is in contact with a shaft shoulder of the mandrel (18), a threaded hole is formed in the spring seat (2), a set screw (3) is arranged in the threaded hole, and fixation is achieved through the set screw (3) and the mandrel (18).
3. The low-rotation-speed dry friction mechanical seal according to claim 2, wherein a plurality of countersunk holes are machined in one end of the spring seat (2) away from the shaft shoulder of the mandrel (18), a plurality of springs (17) are arranged in the countersunk holes, and two ends of each spring (17) respectively support against the bottom of the countersunk holes and one surface, away from the moving ring (7), of the moving ring seat (5).
4. A low-rotation-speed dry friction mechanical seal according to claim 3, characterized in that two shaft sealing rings (15) are arranged between the movable ring seat (5) and the mandrel (18), the shaft sealing rings (15) are installed in first sealing ring grooves of the movable ring seat (5) and are pressed by the mandrel (18), cylindrical pins (4) are arranged between the movable ring seat (5) and the mandrel (18), the cylindrical pins (4) are arranged on the mandrel (18), and the cylindrical pins (4) are matched with the notch of the sealing ring grooves, so that the mandrel (18) and the movable ring seat (5) are kept circumferentially fixed.
5. The low-rotation-speed dry friction mechanical seal according to claim 4, wherein the movable ring (7) and the movable ring seat (5) are locked in the radial direction, so that the movable ring (7) and the movable ring seat (5) are kept circumferentially fixed, and one surface of the movable ring (7) away from the movable ring seat (5) is attached to one surface of the stationary ring (8) away from the gland (10), so that an end face sealing effect is achieved.
6. The low-rotation-speed dry friction mechanical seal according to claim 5, wherein two stationary ring sealing rings (12) are arranged between the stationary ring (8) and the gland (10), and the stationary ring sealing rings (12) are installed in a second sealing ring groove of the gland (10) and are pressed by the stationary ring (8).
7. The low-rotation-speed dry friction mechanical seal according to claim 6, wherein a first through hole is processed between the second seal ring grooves of the two static ring seal rings (12) of the gland (10), the first through hole is communicated with a thread detection hole formed in the gland (10) to serve as a first leakage detection channel, an axial blind hole and a radial blind hole are processed in the static ring (8), the axial blind hole is communicated with the radial blind hole to serve as a second leakage detection channel, an annular groove and a second through hole for detection are formed between the movable ring (7) and the movable ring seat (5), the annular groove and the second through hole serve as a third leakage detection channel, the axial blind hole is concentric with the third leakage detection channel, and the radial blind hole is concentric with the first leakage detection channel.
8. The low-rotation-speed dry friction mechanical seal according to claim 7, wherein a gland sealing ring (13) is arranged between the gland (10) and the cavity (1), the gland sealing ring (13) is installed in the second sealing ring groove of the gland (10), and the gland (10) is pressed on the cavity (1).
9. The low rotational speed dry friction mechanical seal of claim 8, wherein the rotational speed of the mechanical seal is in the range of 0.5-200r/min.
10. A method of detecting a low rotational speed dry friction mechanical seal according to claim 8, comprising the steps of:
S1, connecting and installing air tightness detection equipment and a threaded detection hole on a gland (10), and setting relevant parameters of the air tightness detection equipment;
S2, injecting gas into the first leakage detection channel, and detecting tightness of the gland (10) and the stationary ring (8) by adopting a stationary ring sealing ring (12) after the gas fills the second leakage detection channel;
S3, continuing to inject gas into the first leakage detection channel, and after the gas pushes the stationary ring (8) and the movable ring (7) open, entering the third leakage detection channel, so as to detect the tightness between the movable ring (7) and the stationary ring (8) and the tightness between the mandrel (18) and the movable ring seat (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510013793.9A CN119412502A (en) | 2025-01-06 | 2025-01-06 | A low-speed dry friction mechanical seal and detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202510013793.9A CN119412502A (en) | 2025-01-06 | 2025-01-06 | A low-speed dry friction mechanical seal and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120800695A (en) * | 2025-09-08 | 2025-10-17 | 杭州南泵流体机械有限公司 | Centrifugal pump mechanical seal's gas tightness pressurize inspection frock |
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| DE102021202041A1 (en) * | 2021-03-03 | 2022-09-08 | Robert Bosch Gesellschaft mit beschränkter Haftung | Rod sealing system and cylinder head for a hydraulic cylinder |
| CN115046701A (en) * | 2022-04-29 | 2022-09-13 | 威海赛威智能科技有限公司 | Air tightness detection device and detection method for transducer shell of medical ultrasonic knife |
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2025
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120800695A (en) * | 2025-09-08 | 2025-10-17 | 杭州南泵流体机械有限公司 | Centrifugal pump mechanical seal's gas tightness pressurize inspection frock |
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Application publication date: 20250211 |