JP2003074712A - Mechanical seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lowering of performance of a sliding face of a seal device caused by the heat generation by forcibly supplying a cooling fluid (a quenching fluid) to the seal device. SOLUTION: This mechanical seal device is provided with a pumping ring arranged in a fluid chamber communicating with a fluid passage, and rotated integrally with a rotating shaft. The pumping ring has a pumping hole inclined outward from the inner fluid passage side, and supplies a cooling fluid to the seal device by this pumping.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical seal device having a discharge means of a cooling fluid for cooling a sliding seal surface which generates heat. In particular, it relates to a technical field of a mechanical seal device that efficiently feeds cooling water to a sliding seal surface to cool it.

[0002]

2. Description of the Related Art As prior art relating to the present invention, there is US Pat. No. 4,290,611. FIG. 5 is also a half cross-sectional view of the mechanical seal product disclosed in FIG. 4 of the drawing of this U.S. Pat. No. 4,290,611 and generally commercially available in connection with this patent.

The mechanical seal 100 of the first conventional example shown in FIG. 5 is constructed in a pair so as to be attached to the rotary shaft 151 and mounted in the stuffing box 150 via bolts 160. The mechanical seal 100 includes a liquid sealing device 101, a first seal flange 110, and a second seal flange 120, which are arranged axially outward from the inside of a stuffing box 150.
And the gas sealing device 121 are the main components.

The liquid seal device 101 is mounted on the outer peripheral surface of a sleeve 153 which is fixed to a rotary shaft 151 via a screw socket 152. An O-ring 154 is arranged between the fitting of the rotary shaft 151 and the sleeve 153, and the fitting is sealed by the O-ring 154. This liquid sealing device 101 has a rotary seal surface 1
The rotary seal ring 102 provided with 03 is the U-shaped gasket 10.
It is resiliently pressed by the spring 105 via 7 and the spacer 108. Further, the stationary sealing ring 112 provided with the stationary sealing surface 113 that is in contact with the rotary sealing surface 103 is
It is fitted on the inner peripheral surface of the first seal flange 110 via an O-ring 116. Further, the fixing seal ring 112 and the groove provided on the inner peripheral surface of the first seal flange 110 are engaged with each other via the pin 115 fixed to the fixing seal ring 112.

Second connecting with the first seal flange 110
A gas sealing device 121 is mounted on the inner peripheral surface of the seal flange 120. This gas sealing device 121
Is provided with a drive sleeve 125 fixed to a sleeve 153 via a set screw 126. A second rotation seal ring 122 that fits into the drive sleeve 125 and slides is provided with a second fluid passage for generating a dynamic pressure.
A rotary seal surface 123 is provided. The second rotating seal surface 122 of the second rotating sealing ring 122 is in close contact with the second rotating seal surface 123.
Second fixed sealing ring 132 provided with fixed sealing surface 133
Through the O-ring 136 to the second seal flange 120.
Is fitted to the inner peripheral fitting surface of the. The second fixed seal surface 133 is provided with a plurality of grooves that cooperate with the second rotary seal surface 123 to generate a dynamic pressure along the circumferential surface. Furthermore,
The second rotation sealing ring 122 is elastically pressed toward the second fixing sealing ring 132 side via the coil spring 127.

This mechanical seal 100 includes a rotary shaft 1
It is assembled in 51 and is inserted into the inner peripheral surface 156 of the stuffing box 150 together with the rotating shaft 151 to be internally mounted. Then, the drain 12 is attached to the second seal flange 120.
8 is provided, the intermediate chamber 130 provided with the gas sealing device 121 is configured to have a pressure substantially equal to the atmospheric pressure.

In the mechanical seal 100 constructed as described above, for example, even if the cooling water is jetted from the flushing port 158, the liquid sealing device 101 is filled with the sealed fluid, so the cooling water is the sealed fluid. Mix with. Therefore, the cooling effect of the sealing device 101 is poor, and thermal deformation occurs when the sliding surface generates heat. When the sealing surface slides in a thermally deformed state, the deformed sliding surface is rapidly worn and it becomes difficult to maintain the flatness of the sealing surface. Then, the sealing ability of the sealing surface is lowered, and finally the sealing surface is thermally deformed and its strength is lowered, and finally it is broken.

Further, even if the cooling water is supplied from the drain 128 to the chamber in which the gas sealing device 121 is arranged, the liquid sealing device cannot be structurally cooled, so that each sealing device 1
A cooling supply port must be provided for each 01 and 121. For this reason, the cooling supply device becomes expensive, and the mechanical seal device becomes complicated and large in size.

Further, as a conventional example 2 relating to the present invention, there is JP-A-7-12238. In this publication,
The mechanical seal 100B shown in FIG. 4 is disclosed. In FIG. 4, the mechanical seal has a casing 201.
It is a half cross-sectional view mounted between a rotary shaft 202 and a rotary shaft 202. The mechanical seal 100B is used as a shaft seal for a circulation pump of a boiler, a mill, an agitator, or the like.

In FIG. 4, the rotary shaft 206 is fitted in a through hole 207A provided in the housing 207.
In order to partition the space between the rotary shaft 206 and the housing 207 into an in-machine A and an out-machine B, a mechanical seal 100 is provided.
B is installed. This mechanical seal 100B
Is configured so that the rotary seal ring 201 is fitted to the rotary shaft 206 via the sleeve 204 and rotates together with the rotary shaft 206. The rotary shaft 206 and the rotary seal ring 201
It is sealed by an O-ring so that the fluid to be sealed does not leak during the fitting. The rotary seal ring 201 is provided with a rotary seal surface S1.
1 closely seals with the fixed seal surface S2 of the other party.

On the other hand, the stationary seal ring 202 is attached to the housing 2
It is slidably fitted to the 07 part through an O-ring. The O-ring is inserted into the annular groove of the housing 207 to seal the fitting between the housing 207 and the stationary seal ring 202. In addition, the stationary seal ring 202 is provided with a fixed seal surface S2 on the end face, and the fixed seal surface S2 is in sliding contact with the rotary seal surface S1 and is rotating from inside the machine A to outside the machine B even during rotation.
The fluid is prevented from flowing out. The fixed seal surface S2 is pressed by the spring 203 from the back surface of the stationary seal ring 202 so as to come into pressure contact with the rotary seal surface S1.

A partial impeller 205 is formed on the inner peripheral side of the sleeve 204 fitted to the rotary shaft 206. Further, the housing 207 has a partial impeller 20.
A cooling liquid outflow hole 207a is formed from the vicinity of 5 to the outside. Furthermore, the housing 207 is formed with a cooling liquid inflow hole 207b penetrating in the vicinity of the mechanical seal 100B. The cooling liquid outflow hole 207a and the cooling liquid inflow hole 207b are connected to each other by a pipe outside the machine.
The pipe is equipped with a cooler, and the cooling liquid that cools the mechanical seal 100B and flows out from the cooling liquid outflow hole 207a is recooled by the cooling device. However, since the partial impeller is integrally formed on the outer peripheral surface of the sleeve and further formed inside the housing, the diameter of the impeller cannot be increased. Furthermore, since the rotation speed of the rotary shaft 206 is determined by the discharge amount of the pump, the rotation speed of the rotary shaft 206 cannot be arbitrarily increased as needed for the mechanical seal 100B. Therefore, the discharge amount of the partial impeller 205 is small and the mechanical seal 100B cannot be cooled sufficiently.

In the mechanical seal 100A of the conventional example 1 thus constructed, a cooling device is provided for each of the sealing devices 101 and 121, and cooling is performed by injecting from each of the cooling fluid passages 158 and 128 to each sealing device. However, such a structure increases the cost of the equipment. Further, there is a problem that the mechanical seal 100A becomes structurally large. Further, when the sealed fluid has a high temperature such as a circulating pump of high temperature water in a thermal power plant, even if the cooling water is sprayed onto the high temperature water to cool the liquid sealing device, the liquid sealing device Is difficult to cool efficiently.

Further, when two or more sealing devices are arranged in the mechanical seal 100A such as a tandem seal or a double seal, it is structurally difficult to cool the two sealing devices with one cooling device. Become.

When the mechanical impeller 100B is cooled by rotating the partial impeller 205 of the sleeve 204 fitted to the rotary shaft 206 of the pump or the like to circulate the cooling water and cool the mechanical seal 100B as in the above-mentioned conventional example 2. The rotation speed of the rotary shaft 206 is set according to the pump, and it is not possible to set the rotation speed according to the partial impeller 205, and further it is not possible to set the diameter of the partial impeller regardless of the structure of the pump. Due to the characteristics of the partial impeller 205, the cooling effect of the mechanical seal 100B is reduced. Then, the sealing ring 20 for rotation and for fixing
The seal surfaces S1 and S2 of Nos. 1 and 201 are deformed by the heat generation temperature, and further, the seal surfaces S1 and S2 are damaged. As a result, the sealing ability is reduced and the sealed fluid leaks.

Further, in the cooling method of the second conventional example, in the case where the mechanical seals 100B are arranged in parallel in double, in this partial impeller 205, the two mechanical seals 100B are replaced by the one partial impeller 205. Cooling becomes difficult. Then, since it becomes difficult to cool the sliding heat generation of the liquid side sealing device, the sealing rings 201 and 202 are damaged, or the sealing ability is reduced and the sealed fluid is leaked.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a technical problem to be solved by the invention is to effectively apply a cooling fluid to a sealing device. It is to circulate and cool. Further, whether the mechanical seal is a tandem type seal or a double type seal, it is possible to simultaneously cool the sealing device with the same cooling water.

Another object of the present invention is to make it possible to efficiently cool the sealing device even if the rotational speed of the rotary shaft is small, and to use the pumping ring for the rotary shaft of a device such as a pump.

Further, the equipment cost of the cooling device for the sealing device is reduced, and the pumping ring is easily processed.
Further, the size is made small so that it can be installed in a seal flange that can be attached to the housing.

[0020]

The present invention has been made to solve the above-mentioned technical problem, and the technical solution is configured as follows.

A mechanical seal device of the present invention according to claim 1 is a mechanical seal device having a first seal device and a second seal device which are mounted between a rotary shaft and a housing to seal a sealing fluid. A fluid passage formed in the housing for supplying a fluid, and a fluid in a passage space surface of the housing formed between the first sealing device and the second sealing device in communication with the fluid passage. A chamber, a pumping ring that is arranged in the fluid chamber and rotates integrally with the rotary shaft, and a discharge hole that is in communication with the fluid chamber and discharges the fluid that flows from the pumping ring in the housing. The pumping ring has a pumping hole that is inclined from the inside toward the outside on the side of the fluid passage.

In the mechanical seal device of the present invention according to claim 1, since the pumping ring has the pumping hole inclined outward from the fluid passage side, it is possible to increase the radial length of the pumping hole. Therefore, the discharge amount of cooling water can be increased. Moreover, since the pumping holes can be drilled, the processing is simple and the manufacturing cost can be reduced. Moreover, it is possible to cool the two sealing devices arranged in parallel with one pumping ring.

According to a second aspect of the mechanical seal device of the present invention, the pumping ring has a discharge taper surface on the outer periphery which forms the axial direction of the pumping hole, and the passage space surface has the discharge taper surface. The tapered diaphragm surface is substantially parallel, and the discharge tapered surface and the tapered diaphragm surface are closely closed.

In the mechanical seal device of the present invention according to the second aspect, the pumping ring has a discharge taper surface in the axial direction of the pumping hole at the outer peripheral corner portion, and the tapered diaphragm which is substantially parallel to the discharge taper surface. Since the surface is provided in the passage space surface, the discharge amount can be increased by the action of both surfaces. Therefore, the effect of cooling the sealing device is improved. Then, it is possible to prevent the sealing surface from being damaged due to the heat of the sealing ring and to always exhibit the sealing function.

According to a third aspect of the present invention, there is provided a mechanical seal device having a guide weir between the pumping ring and the second sealing device, the fluid flowing out from the pumping ring to the second sealing device side. Is.

In the mechanical seal device of the present invention according to claim 3, since the guide weir portion for guiding the cooling fluid to the seal surface of the seal device is provided on the outer peripheral side of the seal surface of the seal device, the flow of the fluid is prevented. By changing to a sealing surface, it is cooled effectively.

A mechanical seal according to a fourth aspect of the present invention has a fluid guide ring at the discharge opening of the fluid passage for changing the flow path of the fluid from the fluid passage to the first sealing device side.

In the mechanical seal of the present invention according to claim 4, a fluid guide ring is provided on the liquid sealing device side of the fluid passage to efficiently introduce the cooling fluid into the liquid sealing device. It becomes possible to cool effectively. Therefore, the sliding heat generation of the liquid sealing device is prevented, damage is prevented, and the sealing ability is exerted.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION A mechanical seal device 1 according to an embodiment of the present invention will be described in detail below with reference to the drawings.
It should be noted that each drawing to be described is not a conceptual drawing for patent, but a design drawing with accurate dimensional relationships based on experimental data.

FIG. 1 is a cross-sectional view in which the mechanical seal device 1 according to the present invention is mounted as a cartridge on the outer surfaces of a device body (stuffing box) 60 and a rotary shaft 70. FIG. 2 is a side view of the mechanical seal device 1 of FIG. 1 as seen from the inside of the device body 60 fitted to the rotary shaft 70 in the axial direction.

FIG. 1 shows a mechanical seal device 1 according to the first embodiment of the present invention. In the mechanical seal device 1 of FIG. 1, the seal flange 30 is attached to the outer surface 61 of the device body 60 via bolts 63 as a whole structure. The device body (stuffing box)
And seal flange together to form a housing. on the other hand,
The seal collar 50 is fitted to the outer peripheral surface of the sleeve 53 fitted to the rotary shaft 70, and both are fixed to the rotary shaft 70 by the set screw 51. Then, a plurality of set plates 55 are attached to the side surfaces of the seal flange 30 with bolts to position the seal flange 30 and the seal collar 50, and then the seal collar 50 is attached to the rotary shaft 70.

As shown in FIG. 2, the seal flange (mounting part) 30 attached to the apparatus main body 60 forms an annular disk, and the mounting holes 45 are arranged in four equal intervals along the circumferential direction of the side surface of the disk. It is provided. This seal flange 30
Is mounted on the device main body 60 with the bolt 63 through the mounting hole 45.
Attached to.

A first mounting portion 31 and a second mounting portion 42 for mounting the first fixing sealing ring 3 and the second fixing sealing ring 21 are provided on the inner peripheral surface of the seal flange 30.
Further, a passage space surface 32 through which a fluid passes is provided between the first mounting portion 31 and the second mounting portion 42, and a holding surface 33 is formed on the outer peripheral side of the first mounting portion 31.

Further, the seal flange 30 is provided with two or three cooling fluid passages 40 and discharge holes 41, which are evenly arranged along the outer peripheral surface. The fluid passage 40 is formed so as to communicate from the pipe thread portion 40A connectable to the outer pipe to the liquid seal device (first seal device) 2 side on the inner peripheral surface. Then, the quenching liquid (cooling fluid) is directly poured from the fluid passage 40 to the respective sealing surfaces 6 and 12, and the sliding heat generation of the respective sealing surfaces 6 and 12 is cooled. It passes through the pumping hole 48 of the pumping ring 47, reaches the vicinity of the second sealing surface 22 of the second fixing sealing ring 21 in the second sealing device 20, and flows out from the discharge hole 41. Then, each of the sliding sealing surfaces 6, 1 of the first and second stationary sealing rings 3, 21 and the first and second rotating sealing rings 10, 23 and the like is slid by the quenching liquid.
2, 22, 24 are cooled.

A first mounting portion 31 is provided on the inner peripheral surface of the seal flange 30. The first mounting portion 31 is provided with a fixing pin 35, and the fixing pin 35 is locked in the engaging groove 7 of the first fixing sealing ring 3 and does not rotate the first fixing sealing ring 3. To hold. A holding surface 33 is provided on the inner peripheral surface of the seal flange 30, and the fixing portion 5B of the packing 5 is hermetically fitted on the holding surface 33.

Further, on the outer peripheral surface of the seal flange 30,
Four fluid passages 40 for cooling are evenly provided,
The fluid passage 40 penetrates to the vicinity of the first mounting portion 31 side of the inner peripheral surface, and a passage space surface is formed so that the fluid communicates with the back surface of the first fixing seal ring 3 and the back surface of the packing 5. There is. A fluid guide ring 46 is fitted to the fitting surface 38 of the seal flange 30 so as to close a part of the opening through which the fluid passage 40 penetrates to the inner peripheral surface. Then, the fluid guide ring 46 is locked to the seal flange 30 by a set screw or the like. The fluid guide ring 46 has a guide surface formed on the outer circumference so as to introduce the quenching liquid to the vicinity of the first sealing surface 6 of the first fixing seal ring 3 and the back surface of the packing 5.

A passage space surface 32 is provided on the inner periphery of the seal flange 30, and the quenching liquid is formed in the passage space surface 32. And
A discharge hole 41 having the same shape as the fluid passage 40 provided in the seal flange 30 is provided on the other side, and the discharge hole 41 communicates with the fluid passage 40 through the passage space surface 32. Then, the quenching liquid introduced from the fluid passage 40 passes through the passage space surface 32 and is discharged from the discharge hole 41.

The first fixing seal ring 3 is formed with the first sealing surface 6 as an end surface, and engaging grooves 7 are formed on the back surface thereof at equal intervals in the circumferential direction. Further, a plurality of spring seats are provided equidistantly in the circumferential direction on the back surface of the first fixing seal ring 3, and springs 9 are respectively seated on the spring seats to repel the first fixing seal ring 3. And is pressed in the direction of the first seal surface 6. Further, the outer peripheral surface of the first fixing seal ring 3 is provided with a joining surface 3A and a supporting surface 3B which are formed in a step portion that is in close contact with the packing 5. The first fixing seal ring 3 is made of a material such as silicon carbide, carbon, or ceramic.

The inner peripheral side step portion 13 of the first rotary sealing ring 10 provided with the first relative sealing surface 12 is hermetically fitted to the outer peripheral corner portion of the flange 53A of the sleeve 53. This first
The rotation sealing ring 10 is prevented from rotating by the locking groove 11 locking the fixing pin 52 provided on the sleeve 53.
Further, the first rotating sealing ring 10 is axially fixed by a snap ring 53B. This first rotation seal ring 1
0 is made of materials such as silicon carbide, carbon, and other ceramics.

The packing 5 is made of a rubber material and formed into a disk-shaped ring. The packing 5 has a fixed portion 5B on the outer periphery.
Is provided and the inner circumference is formed in the seal lip portion 5A. The fixed portion 5B is fitted on the holding surface 33 of the seal flange 30. Further, the fixed portion 5B of the packing 5 is held from the side surface by the cover plate 43, and is covered by the cover plate 43 up to half of the sealed fluid side of the packing 5 toward the inner seal lip portion 5A side. There is. The cover plate 43 protects the pressure of the sealed fluid from directly acting on the packing 5.

In the packing 5, the fixing portion 5B has the holding surface 3
3 and the seal lip portion 5A is the first
Stepped joint surface 3 formed on the outer peripheral surface of the stationary seal ring 3
A is hermetically fitted to A to attach the first fixing seal ring 3 to the first sealing surface 6
The elastic force of the seal lip portion 3A rebounds in the direction. As the material of the packing 5, perfluoroelastomer, fluororubber, nitrile rubber, EPDM, polyester elastomer or the like is used.

The seal collar 50 has a flange 50 at one end.
It is formed in a tubular shape provided with A. Also, the sleeve 53
Is also formed in a circular tube shape having a flange portion 53A at one end. The seal collar 50 and the sleeve 53 are fitted to the sleeve 53 with the flange 50A and the flange portion 53A on the opposite sides. The sleeve 53 is hermetically fitted to the rotary shaft 70 via an O-ring, and the seal collar 50 and the sleeve 53 are fixed to the rotary shaft 70 by the set screw 51. The inner peripheral surface of the first rotating sealing ring 10 is hermetically fitted to the flange portion 53A of the sleeve 53 via the O-ring as described above.

The cover plate 43 has an L-shaped cross section and is formed in an annular shape. The outer peripheral surface of the cover plate 43 is fitted to the inner peripheral surface 62 of the stuffing box 60 on the sealed fluid side, and the seal flange 30 is mounted and positioned. The cover plate 43 can be fixed by a bolt 44 from the outside on the atmosphere side. The cover plate 43 has an annular shape and holds the fixing portion 5B of the packing 5 so that it does not move, and is formed with an inner diameter that covers an intermediate portion of the inside of the packing 5 on the sealed fluid side. So that the pressure does not work.

In the fluid chamber 32A in the passage space surface 32 of the seal flange 30, the pumping ring 47 has a rotating shaft 70.
It is fitted integrally with the O-ring. The pumping ring 47 is provided with a pumping hole 48, and the pumping hole 48 is inclined from the inner side to the outer side from the upstream side to the downstream side. Furthermore, the pumping holes 48 are arranged at equal intervals along the circumferential direction of the pumping ring 47. Then, the quenching liquid on the liquid seal device 2 side is pumped in the direction of the discharge hole 41. or,
Recessed portion 57A provided on the inner circumference of the pumping ring 47
Is engaged with the convex portion 57B and the concave-convex engaging portion 57 of the tubular end portion of the seal collar 50, and the pumping ring 47 and the rotary shaft 7 are locked.
0 and 0 are configured to rotate integrally.

A discharge taper surface 47A is formed on the outer peripheral corner of the pumping ring 47. This discharge taper surface 4
7A, the passage space surface 32 facing the taper diaphragm surface 32
A is formed. The discharge taper surface 47A and the tapered diaphragm surface 32A cooperate to form a discharge means. Then, the quenching liquid is efficiently pumped to the second sealing device. Further, the outer peripheral surface of the pumping ring 47 and the passage space surface 32 are brought close to each other to reduce the gap H and form the throttle portion 16. The quenching liquid is strongly discharged by the throttle portion 16.

Next, a second seal device 20 is provided on the seal flange 30 in the outward direction of the fluid chamber 15.
The second sealing device 20 seals the quenching liquid so as not to flow out (also serves as an auxiliary seal for the sealed fluid). The second sealing device 20 is provided with a second fixing sealing ring 21. This second
A second sealing surface 22 is formed on the end surface of the stationary sealing ring 21, and is movably fitted to the fitting surface 36 of the inner peripheral surface of the seal flange 30 via the O-ring. Then, the second fixing seal ring 21 attached to the second attaching portion 42.
Is held so that the engaging groove 25 provided on the outer peripheral flange and the fixing pin 27 of the second mounting portion 42 are locked and do not rotate. The second fixing seal ring 21 is pressed from the back surface toward the second seal surface 22 by the second spring 28 seated on the second mounting portion 42.

In addition, the second relative sealing surface 24 is provided on the second rotation sealing ring 23 which is in close contact with the second fixing sealing ring 21 so as to face it.
Are formed. This second relative sealing surface 24 is
The seal contacts the second sealing surface 22 of the stationary sealing ring 21. Further, the outer peripheral surface of the second rotary sealing ring 23 is fitted to the mounting step portion 47A of the pumping ring 47 via an O-ring. Further, the second rotation seal ring 23 is locked by the fixing pin 49 fixed to the pumping ring 47 and the locking groove 26. The second rotation seal ring 23 is connected to the pumping ring 47 so as to rotate together with the rotation shaft 70. The second stationary seal ring 21 and the rotary seal ring 23 are made of a material such as silicon carbide, carbon, or other ceramics.

Outside the second sealing device 20, a convex guide weir portion 17 for flowing the quenching liquid to the second sealing device side is provided on the sealing flange 30. The guide weir portion 17 is attached to a groove formed in the seal flange 30 with a disc ring, a snap ring, or the like in a fitted state. Then, the quenching liquid discharged from the pumping hole 48 is caused to flow to the side of the second sealing device 20 by the guide dam portion 17 to cool the second sealing device 20, and then to flow out from the discharge hole 41. Then, the discharged quenching liquid is cooled by the cooler R in the middle of the pipe, and is also sent to the fluid passage 40 by the supply pump M under pressure.

FIG. 3 is a cross-sectional view of the essential parts of a mechanical seal device showing a second embodiment of the present invention. The mechanical seal device shown in FIG. 3 has substantially the same structure as the mechanical seal device 1 shown in FIG. The difference is that the discharge taper surface 47A provided on the outer periphery of the pumping ring 47 is provided with a pressure feeding portion 47B having a trapezoidal cross section. Then, the quenching liquid is strongly pressure-fed to the second sealing device 20 side. As an example of the pressure feeding portion 47B, the pressure feeding portion 47B having a similar shape can be formed on the tapered diaphragm surface 32A. Further, the pressure feeding portion 47B may be formed on both surfaces of the discharge tapered surface 47A and the tapered diaphragm surface 32A.
The pressure feeding portion 47b may be formed as an uneven portion having a triangular cross section and a quadrangular cross section. Alternatively, the groove may be formed in the taper direction. The concave and convex portions are continuous in a screw shape in the axial direction, and the grooves are evenly arranged in the circumferential direction.

The pumping ring 47 is provided in the fluid chamber 15 between the first sealing device 2 and the second sealing device 20, and also connects the fluid passage 40 and the discharge hole 41 provided in the seal flange 30. It is arranged on the way of communication. Since it is cooled by the cooled quenching liquid that is not mixed with the sealed fluid, it is possible to cool the plurality of sealing devices efficiently and continuously.

[0051]

The mechanical seal device according to the present invention has the following effects.

According to the mechanical seal device of the present invention according to claim 1, the pumping ring has the pumping hole inclined outward from the fluid passage side on the inner diameter side, so that the length of the pumping hole in the radial direction is increased. Therefore, it is possible to increase the discharge amount of the cooling water. Therefore, there is an effect that the sealing device is efficiently cooled, and the sealing surface of the sealing device is prevented from being damaged by the heat generated by the sliding frictional heat of the sealing device, and the sealing ability is not deteriorated. Moreover, since the pumping hole can be formed by drilling, the pumping hole can be easily processed, and the effect of reducing the manufacturing cost can be expected. Moreover, it is possible to continuously cool the two sealing devices arranged in parallel by one pumping ring.

According to the mechanical seal device of the second aspect of the present invention, the pumping ring has a taper surface at the outer peripheral corner portion in the axial center direction of the pumping hole, and the throttle surface substantially parallel to the taper surface is passed through. Since it is provided on the space surface, an effect of increasing the ejection amount can be expected. And the effect of dramatically improving the cooling effect of the sealing device is achieved. As a result, the sealing ring is prevented from being damaged due to sliding heat generation, and the sealing function is exerted.

According to the mechanical seal device of the present invention as defined in claim 3, since the guide weir portion for guiding the cooling fluid to the seal surface of the seal device is provided on the outer peripheral side of the seal surface of the seal device, the quench is formed. The effect of changing the flow of the ching liquid to the seal surface side and effectively cooling the seal surface can be expected.

According to the mechanical seal device of the fourth aspect of the present invention, the fluid guide ring is provided on the liquid seal device side of the fluid passage to efficiently introduce the cooling water into the liquid seal device. This has the effect of effectively cooling the device. Therefore, it is possible to prevent sliding heat generation of the liquid sealing device, prevent damage to the sealing surface, and exert the sealing ability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view in which a mechanical seal device according to a first embodiment of the present invention is mounted between a seal flange and a rotary shaft.

FIG. 2 is a side view in the axial direction of the mechanical seal device shown in FIG. 1 as viewed from the inside of the device body.

FIG. 3 is a half cross-sectional view showing a main part of a mechanical seal device showing a second embodiment according to the invention.

FIG. 4 is a sectional view of a conventional mechanical seal.

FIG. 5 is a state diagram of another conventional mechanical seal.

[Explanation of symbols]

1 mechanical seal 2 Liquid sealing device 3 First fixed sealing ring 3A joint surface 3B support surface 5 packing 5A seal lip 5B fixed part 5C reinforcement ring 6 First sealing surface 7 engagement groove 9 springs 10 Seal ring for 1st rotation 11 engaging groove 12 Relative sealing surface 13 Inner peripheral side step 15 Fluid chamber 17 Guide weir 20 Second sealing device 21 Second fixing seal ring 22 Second sealing surface 23 Sealing ring for second rotation 24 Second relative sealing surface 25 engagement groove 26 Engagement groove 27 fixing pin 28 Second spring 30 seal flange 31 First mounting part 32 passage space surface 32A tapered diaphragm surface 33 Holding surface 35 fixing pin 36 Mating surface 37 Positioning convex part 38 Mating surface 40 fluid passage 40A pipe thread 41 Discharge hole 42 Second mounting part 43 cover plate 44 Volts 45 mounting holes 46 Fluid guide ring 47 pumping ring 47A discharge taper surface 47B pumping unit 48 pumping holes 49 fixing pin 50 seal color 51 set screws 52 Fixed pin 53 Sleeve 53A flange 53B snap ring 55 set plate 56 Engagement groove 57 Concavo-convex engaging part 57A recess 57B convex part 59 Volts 60 Machine body (stuffing box) 61 exterior 62 Inner surface 63 volts 70 rotation axis M supply pump R cooler

Claims (4)

[Claims] 1. A mechanical seal device having a first seal device and a second seal device mounted between a rotary shaft and a housing to seal a sealed fluid, the mechanical seal device being formed in the housing to supply the fluid. A fluid passage, a fluid chamber in a passage space surface of the housing formed between the first sealing device and the second sealing device in communication with the fluid passage, and arranged in the fluid chamber to rotate. The pumping ring is connected to a shaft and rotates integrally with the shaft. The pumping ring is provided with a discharge hole that is in communication with the fluid chamber and discharges a fluid flowing from the pumping ring. A mechanical seal device having a pumping hole inclined from the inner side to the outer side. 2. The pumping ring has a discharge taper surface on the outer peripheral surface thereof in the axial direction of the pumping hole, and has a tapered diaphragm surface substantially parallel to the discharge taper surface on the passage space surface. The discharge taper surface and the tapered diaphragm surface are close to each other and are narrowed.
Mechanical seal device described in. 3. A guide weir portion is provided between the pumping ring and the second sealing device to allow a fluid from the pumping ring to flow out to the second sealing device side. The mechanical seal device described in 2. 4. The fluid guide ring at the discharge opening of the fluid passage for changing the flow path of the fluid from the fluid passage to the first sealing device side. The mechanical seal device according to item 3.